阅读说明：本技术 快速连接器 (Quick connector ) 是由 钟江亮祐 泷本依史 今西庆次 于 2020-06-01 设计创作，主要内容包括：一种能够实现小型化、将连接器主体和保持器分体地形成、且不需要保持器的操作就能够防止管的脱落的快速连接器,在管(4)插入连接器主体(10)时,第一腿部(32)通过管(4)的环状突部(4a)对保持器(30)的第一腿部(32)的锥面(32b1)的向轴向的按压力而扩张变形,通过第一腿部(32)扩张变形而管(4)的环状突部(4a)能够沿插入方向通过第一腿部(32)。在管(4)从连接器主体(10)的正规位置释放时,通过以使保持器(30)从基准位置向预定方向移动的方式进行操作,第一腿部(32)通过与第一引导部(26)抵接而扩张变形,通过第一腿部(32)扩张变形而管(4)的环状突部(4a)能够沿释放方向通过第一腿部(32)。(A quick connector which can be made compact, has a connector body and a retainer formed separately, and can prevent the tube from falling off without requiring the operation of the retainer, wherein when the tube (4) is inserted into the connector body (10), a first leg portion (32) is expanded and deformed by an axial pressing force of an annular projection (4a) of the tube (4) against a tapered surface (32b1) of the first leg portion (32) of the retainer (30), and the annular projection (4a) of the tube (4) can pass through the first leg portion (32) in the insertion direction by the expansion and deformation of the first leg portion (32). When the pipe (4) is released from the normal position of the connector body (10), the first leg (32) is expanded and deformed by abutting the first guide part (26) by operating the retainer (30) to move from the reference position to the predetermined direction, and the annular protrusion (4a) of the pipe (4) can pass through the first leg (32) in the release direction by the expansion and deformation of the first leg (32).)

1. A quick connector is characterized in that a quick connector body is provided,

the quick connector is provided with:

a connector body into which a tube having an annular projection can be inserted; and

a retainer that is formed separately from the connector body, is disposed on the connector body so as to be movable from a reference position in a predetermined direction intersecting an axial direction of the connector body, and is locked to the annular projection in the axial direction in a state where the tube is inserted to a normal position of the connector body, thereby preventing the tube from coming off,

the holder is provided with:

a base; and

a pair of first leg portions that are provided on the base portion so as to be expandable and deformable, and through which the annular protrusion can pass in an expanded and deformed state, and that are locked to the annular protrusion in an axial direction in a state in which the retainer is located at the reference position and is not expanded,

the first leg further includes:

a tapered surface formed on a surface on a side into which the pipe is inserted, the tapered surface being capable of abutting against the annular protrusion when the pipe is inserted into the connector body; and

a locking surface formed on a surface opposite to a side into which the pipe is inserted and locked to the annular protrusion,

the connector body further includes a first guide portion that can be brought into contact with the first leg portion and that is expanded and deformed by the movement of the retainer in the predetermined direction,

when the pipe is inserted into the connector body, the first leg portion is expanded and deformed by a pressing force of the annular protrusion portion against the tapered surface in the axial direction, and the annular protrusion portion of the pipe can pass through the first leg portion in the insertion direction by the first leg portion being expanded and deformed,

when the pipe is released from the normal position of the connector body, the first leg portion is expanded and deformed by being brought into contact with the first guide portion by operating the retainer so as to move from the reference position to the predetermined direction, and the annular projection of the pipe can pass through the first leg portion in a releasing direction by the expanded and deformed first leg portion.

2. The quick connector of claim 1,

said tapered surface being inclined with respect to said predetermined direction of movement of said holder,

when the pipe is inserted into the connector body, the retainer is moved in the predetermined direction from the reference position by a pressing force in the axial direction of the tapered surface by the annular protrusion, and the first leg portion is expanded and deformed by the retainer being moved in the predetermined direction from the reference position, and the annular protrusion of the pipe can pass through the first leg portion in the insertion direction by the first leg portion being expanded and deformed.

3. The quick connector of claim 2,

the tapered surface is inclined in a direction in which the first leg portion expands, in addition to being inclined with respect to the predetermined direction in which the retainer moves,

when the pipe is inserted into the connector body, the retainer is moved in the predetermined direction from the reference position by the pressing force in the axial direction of the tapered surface by the annular projection, and the first leg portion is expanded and deformed by the contact with the first guide portion by the movement of the retainer in the predetermined direction from the reference position

When the pipe is inserted into the connector body, a force in an expanding direction of the first leg portion acts on the tapered surface by an axial pressing force of the annular protrusion on the tapered surface, whereby the first leg portion is expanded and deformed,

the annular projection of the tube is able to pass through the first leg portion in the insertion direction by the first leg portion being deformed by expansion.

4. The quick connector of claim 1,

the tapered surface is inclined in a direction in which the first leg portion expands,

when the pipe is inserted into the connector body, a force in an expanding direction of the first leg portion acts on the tapered surface by a pressing force in an axial direction of the annular protrusion against the tapered surface, whereby the first leg portion is expanded and deformed in a state where the first leg portion and the first guide portion are not in contact with each other,

the annular projection of the pipe is able to pass through the first leg portion in the insertion direction by the first leg portion being expanded and deformed when the pipe is inserted into the connector body.

5. The quick connector according to any one of claims 1 to 4, characterized in that the predetermined direction is a direction in which the base of the retainer is pressed into the connector body.

6. The quick connector according to any one of claims 1 to 5, wherein the first guide portion is disposed at a position opposed to a distal end of the first leg portion and is inclined in a direction in which the first leg portion expands.

7. The quick connector according to any one of claims 1 to 6, wherein the connector body further includes a first wall portion that is disposed to face an outer surface of the first leg portion, limits an amount of expansion deformation of the first leg portion, and protects the first leg portion.

8. The quick connector according to any one of claims 1 to 7,

the holder further includes a pair of second legs provided to the base independently of the pair of first legs and provided on a side opposite to a side where the tube is inserted with respect to the first legs,

the second leg portion includes a restricting portion that restricts movement of the holder from the reference position in a direction opposite to the predetermined direction.

9. The quick connector according to claim 8, wherein the second leg portion is formed to be elastically deformable, and accumulates elastic return energy for returning the retainer to the reference position by being elastically deformed when the retainer is moved from the reference position in the predetermined direction.

10. The quick connector of claim 9, wherein the second leg is elastically deformable in a direction in which distal ends of the second leg approach each other.

11. The quick connector according to claim 10, wherein the connector body further includes a second guide portion that can abut against the second leg portion and elastically deform the second leg portion by the movement of the retainer in the predetermined direction.

12. The quick connector according to claim 11, wherein the second guide portion is disposed at a position opposed to the distal end of the second leg portion and is inclined in a direction in which the distal ends of the second leg portions approach each other when the retainer is moved in the predetermined direction.

13. The quick connector according to any one of claims 10 to 12, wherein the connector body further includes a second wall portion that is disposed opposite to an outer surface of the second leg portion, restricts expansion deformation of the second leg portion, and protects the second leg portion.

14. The quick connector according to any one of claims 1 to 13, wherein the connector body does not have an element that restricts the annular projection in a direction in which the tube falls out.

15. The quick connector of any one of claims 1 to 14, wherein the connector body and the retainer are formed of different materials.

Technical Field

The present invention relates to a quick connector.

Background

Japanese patent No. 4937426 and japanese patent No. 4871749 describe quick connectors including a retainer formed integrally with a connector housing. The retainer is expandable and deformable to allow the annular projection of the tube to pass therethrough. Further, the retainer is locked to the annular projection of the tube in a state where the tube is inserted to the normal position and the retainer is not expanded and deformed, thereby preventing the tube from falling off.

Japanese patent No. 6149081 discloses a quick connector including a connector body and a retainer formed separately from the connector body. The retainer is moved from the initial position to the confirmation position by a press-fitting operation at the initial position, and the retainer at the confirmation position prevents the tube from falling off.

Japanese patent No. 3702671 discloses a quick connector including a connector body and a retainer formed separately from the connector body. The retainer is inserted into the connector body from an axial opening side of the connector body and is mounted to the connector body. In this state, the annular protrusion of the tube is locked to the retainer by inserting the tube. On the other hand, when the tube is released, the tube is pulled out from the connector body together with the retainer.

Disclosure of Invention

Problems to be solved by the invention

In the quick connectors disclosed in japanese patent No. 4937426 and japanese patent No. 4871749, since the connector housing and the retainer are integrated, both are formed of the same material. The connector housing and the retainer are required to be formed of different kinds of materials because of different functions, but this is not easily achieved in the structure of the quick connector.

In the quick connector disclosed in japanese patent No. 6149081, in order to reliably prevent the tube from coming off, it is necessary to move the retainer from the initial position to the confirmation position. The tube is prevented from falling off without moving the holder.

In the quick connector described in japanese patent No. 3702671, since the retainer is inserted into the connector body from the axial opening of the connector body, it is necessary to secure the axial length of the retainer. Therefore, the axial length of the connector body becomes long. The axial length of the connector body is shortened to realize miniaturization of the quick connector.

The invention aims to provide a quick connector which can realize miniaturization, can form a connector main body and a retainer separately, and can prevent a pipe from falling off without the operation of the retainer.

Means for solving the problems

The quick connector according to the present invention includes: a connector body into which a tube having an annular projection can be inserted; and a retainer that is formed separately from the connector body, is disposed on the connector body so as to be movable from a reference position in a predetermined direction intersecting an axial direction of the connector body, and is locked to the annular projection in the axial direction in a state where the tube is inserted to a normal position of the connector body, thereby preventing the tube from coming off.

The holder is provided with: a base; and a pair of first leg portions that are provided on the base portion so as to be expandable and deformable, and through which the annular protrusion can pass in an expanded and deformed state, and that are locked to the annular protrusion in an axial direction in a state in which the retainer is located at the reference position and is not expanded.

The first leg further includes: a tapered surface formed on a surface on a side into which the pipe is inserted, the tapered surface being capable of abutting against the annular protrusion when the pipe is inserted into the connector body; and a locking surface formed on a surface opposite to a side into which the pipe is inserted, and locked to the annular protrusion. The connector body further includes a first guide portion that can come into contact with the first leg portion and that is configured to expand and deform the first leg portion by moving the retainer in the predetermined direction.

When the pipe is inserted into the connector body, the first leg portion is expanded and deformed by a pressing force in the axial direction of the tapered surface from the annular protrusion, and the annular protrusion of the pipe can pass through the first leg portion in the insertion direction by the expansion and deformation of the first leg portion. When the pipe is released from the normal position of the connector body, the first leg portion is expanded and deformed by being brought into contact with the first guide portion by operating the retainer so as to move from the reference position to the predetermined direction, and the annular projection of the pipe can pass through the first leg portion in a releasing direction by the expanded and deformed first leg portion.

As described above, the connector body and the retainer of the quick connector are formed separately. This allows the connector body and the retainer to be made of different materials. Further, the retainer is configured to be movable in a predetermined direction intersecting with an axial direction of the connector body. This enables the quick connector to be downsized. Further, the retainer can prevent the tube from falling off in a reference state in which the operator does not perform any operation for moving the retainer.

Drawings

Fig. 1 is a perspective view of a connector body 10 and a retainer 30 constituting a quick connector 1 according to a first example, a resin pipe 3, and a metal pipe 4 before assembly.

Fig. 2 is a perspective view of the connector body 10 with the front portion partially cut.

Fig. 3 is a perspective view of the connector body 10 in which the front portion is partially cut at a position further to the back side than fig. 2.

Fig. 4 is a perspective view seen from the front side of the holder 30.

Fig. 5 is a perspective view of the retainer 30 as viewed from the back side.

Fig. 6A is a side view of the quick connector 1 in a state before tube insertion.

Fig. 6B is a perspective view taken along line 6B-6B of fig. 6A.

Fig. 6C is a perspective view taken along line 6C-6C of fig. 6A.

Fig. 6D is a cross-sectional view of 6D-6D of fig. 6A.

Fig. 6E is a cross-sectional view of 6E-6E of fig. 6A.

Fig. 7A is a sectional view of the quick connector 1 in a first state where a pipe is partially inserted, and is a view corresponding to fig. 6D.

Fig. 7B is a sectional view of the quick connector 1 in the first state where a pipe is partially inserted, and is a view corresponding to fig. 6E.

Fig. 8A is a sectional view of the quick connector 1 in a second state where a pipe is partially inserted, and is a view corresponding to fig. 6D.

Fig. 8B is a sectional view of the quick connector 1 in a second state where a pipe is partially inserted, and is a view corresponding to fig. 6E.

Fig. 9A is a sectional view of the quick connector 1 in a state where the tube insertion is completed, and is a view corresponding to fig. 6D.

Fig. 9B is a sectional view of the quick connector 1 in a state where the tube insertion is completed, and is a view corresponding to fig. 6E.

Fig. 10A is a sectional view of the quick connector 1 in the initial release state, and is a view corresponding to fig. 6D.

Fig. 10B is a sectional view of the quick connector 1 in the initial release state, and is a view corresponding to fig. 6E.

Fig. 11A is a sectional view of the quick connector 1 in the post-release state, and is a view corresponding to fig. 6D.

Fig. 11B is a sectional view of the quick connector 1 in the post-release state, and is a view corresponding to fig. 6E.

Fig. 12 is a perspective view of the connector body 50 and the retainer 70 constituting the quick connector 2 of the second example, showing a state before assembly of the resin pipe 3 and the metal pipe 4.

Fig. 13 is a perspective view of the connector body 50 with the front portion partially cut.

Fig. 14 is a perspective view of the connector body 50 with the front portion partially cut at a position further to the back side than fig. 13.

Fig. 15 is a perspective view seen from the front side of the holder 70.

Fig. 16 is a perspective view of the holder 70 as viewed from the back side.

Fig. 17A is a side view of the quick connector 2 in a state before tube insertion.

Fig. 17B is a perspective view taken along line 17B-17B of fig. 17A.

Fig. 17C is a perspective view taken along line 17C-17C of fig. 17A.

Fig. 17D is a cross-sectional view of 17D-17D of fig. 17A.

Fig. 17E is a cross-sectional view of 17E-17E of fig. 17A.

Fig. 18A is a sectional view of the quick connector 2 in a first state where a pipe is partially inserted, and is a view corresponding to fig. 17D.

Fig. 18B is a sectional view of the quick connector 2 in the first state where a pipe is partially inserted, and is a view corresponding to fig. 17E.

Fig. 19A is a sectional view of the quick connector 2 in a second state where a tube is partially inserted, and is a view corresponding to fig. 17D.

Fig. 19B is a sectional view of the quick connector 2 in a second state where a pipe is partially inserted, and is a view corresponding to fig. 17E.

Fig. 20A is a sectional view of the quick connector 2 in a state where tube insertion is completed, and corresponds to fig. 17D.

Fig. 20B is a sectional view of the quick connector 2 in a state where the tube insertion is completed, and is a view corresponding to fig. 17E.

Fig. 21A is a sectional view of the quick connector 2 in the initial release state, and is a view corresponding to fig. 17D.

Fig. 21B is a sectional view of the quick connector 2 in the initial release state, and is a view corresponding to fig. 17E.

Fig. 22A is a sectional view of the quick connector 2 in the post-release state, and is a view corresponding to fig. 17D.

Fig. 22B is a sectional view of the quick connector 2 in the post-release state, and is a view corresponding to fig. 17E.

Detailed Description

(1. overview of the first example quick connector 1)

An outline of the quick connector 1 of the first example will be described with reference to fig. 1. The quick connector 1 constitutes a part of a fuel pipe of an automobile, for example, and forms a flow path for flowing fuel. The quick connector 1 is mainly formed of resin. The quick connector 1 connects two tubes 3, 4.

One end of the quick connector 1 is connected to a resin pipe 3 (also referred to as a resin pipe), for example. The resin pipe 3 is externally fitted to one end of the quick connector 1 in a state of being deformed to expand in diameter following the shape of the outer peripheral surface of the one end of the quick connector 1. One end of the quick connector 1 and the resin pipe 3 are prevented from coming off by frictional locking force therebetween.

The other end of the quick connector 1 is connected to a metal pipe 4, for example. The distal end side of the metal pipe 4 is inserted from the opening at the other end of the quick connector 1. The metal pipe 4 includes an annular protrusion 4a (also referred to as a bead or a flange) formed to protrude radially outward at a position spaced apart from the end in the axial direction. The pipe 4 has a distal end portion 4b at a small-diameter portion on the distal end side of the annular protrusion 4a, and an intermediate portion 4c at a small-diameter portion on the opposite end side of the annular protrusion 4 a. The annular projection 4a is locked to the quick connector 1 in the axial direction, thereby preventing the tube 4 from coming off.

(2. integral construction of the quick connector 1 of the first example)

The overall structure of the quick connector 1 of the first example will be described with reference to fig. 1. The quick connector 1 includes a connector body 10 and a holder 30. In this example, the connector body 10 is formed separately from the retainer 30.

Here, the axial direction, the vertical direction, and the horizontal direction used in the following description are defined. The axial direction is an axial direction of the pipe 4 in a state where the metal pipe 4 is inserted into the quick connector 1. In the connector body 10, a side into which the pipe 4 is inserted is an axially forward side (corresponding to a pipe insertion side), and an opposite side thereof is an axially rearward side (corresponding to an opposite pipe insertion side). When viewed from the axial direction of the tube 4, the lower direction is the press-fitting direction of the retainer 30, and the upper direction is the extraction direction of the retainer 30 (the opposite direction to the press-fitting). The left-right direction is a direction orthogonal to the up-down direction when viewed from the axial direction of the tube 3.

The connector body 10 is formed in a cylindrical shape. The connector body 10 can be formed in various shapes such as an L shape and a linear shape. One end of the connector body 10 is formed in a shape capable of being externally fitted with a resin pipe 3. The other end of the connector body 10 is formed in a shape into which the metal pipe 4 can be inserted. Here, the connector body 10 exerts a locking force (retaining force) on the resin pipe 3. On the other hand, the connector body 10 does not exert a locking force (retaining force) on the metal pipe 4. That is, the connector body 10 does not have an element for regulating the annular projection 4a of the tube 4 in the direction in which the tube 4 is pulled out.

The connector body 10 may be formed of one member, or may be formed by combining a plurality of members. The connector body 10 is formed of a resin having impact resistance, heat resistance, chemical resistance, and the like. The connector body 10 is formed of, for example, glass fiber reinforced polyamide.

The retainer 30 is formed separately from the connector body 10. The retainer 30 is attached to the connector body 10 by being inserted into the connector body 10 from a direction intersecting the axial direction of the connector body 10. The retainer 30 is disposed on the connector body 10 so as to be movable from a reference position where it is attached in a predetermined direction (downward direction) intersecting the axial direction of the connector body 10. Further, the retainer 30 is locked to the annular projection 4a of the tube 4 in the axial direction in a state where the metal tube 4 is inserted to the normal position of the connector body 10, thereby preventing the tube 4 from coming off.

The retainer 30 is formed of at least a resin having heat resistance, chemical resistance, and the like. The holder 30 is formed of polyamide, for example. The retainer 30 can be made of a material having lower impact resistance than the connector body 10. Therefore, the retainer 30 is formed of a material different from that of the connector body 10, and can be realized at low cost. However, the retainer 30 may be formed of the same material as the connector body 10.

(3. details of the constituent parts of the quick connector 1 of the first example)

The quick connector 1 of the first example includes the connector body 10 and the retainer 30 as described above. However, the quick connector 1 includes a sealing unit, not shown, inside the connector body 10. The sealing unit is well known, and thus a detailed description is omitted.

(3-1. Structure of connector body 10)

The structure of the connector body 10 will be described with reference to fig. 1 to 3. The connector body 10 includes a first connection portion 11 for housing the resin pipe 3 and a second connection portion 12 for inserting the metal pipe 4. First connection portion 11 is provided at one end side (lower rear side in fig. 1) of connector body 10, and pipe 3 made of resin is externally fitted to first connection portion 11. The outer peripheral surface of the first connection portion 11 is formed in a stepped shape in a direction along the flow path so as to have a retaining force in a state where the resin pipe is fitted.

The second connection portion 12 is provided on the other end side (upper side in fig. 1) of the connector body 10, and is capable of inserting the distal end portion 4b and the annular protrusion 4a of the metal pipe 4. The second connection portion 12 is formed in a cylindrical shape into which the metal pipe 4 can be inserted, and has a hole penetrating in a direction (vertical direction in fig. 1) intersecting the axial direction of the pipe 4 at a portion on the insertion side (front side) of the metal pipe 4.

A seal unit, not shown, is disposed on the inner peripheral side of the second connection portion 12. The seal unit is composed of, for example, a plurality of annular seal members made of fluororubber, a resin collar disposed so as to be sandwiched between the plurality of annular seal members in the axial direction, and a resin bush for positioning the annular seal members and the collar in the connector body. The sealing means seals a space between the inner peripheral surface of the second connecting portion 12 and the outer peripheral surface of the distal end portion 4b of the metal pipe 4 in the radial direction.

As shown in fig. 1 to 3, the second connection portion 12 includes a tube portion 21 disposed on the back side. The first connection portion 11 is connected to an end of the cylindrical portion 21. The cylindrical portion 21 is provided with a seal means, and the distal end portion 4b of the metal pipe 3 is inserted. As shown in fig. 3, the front end surface of the cylindrical portion 21 is formed in a flange shape extending radially outward from the circular opening.

As shown in fig. 1, the second connecting portion 12 further includes an insertion port surface 22 that is coaxially arranged at a distance from the distal end surface of the cylindrical portion 21 toward the axial front side. The insertion port surface 22 is formed in the same outer shape as the distal end surface of the cylinder 21 and faces in the axial direction. A circular hole is formed in the center of the insertion opening surface 22.

As shown in fig. 2 and 3, the second connecting portion 12 further includes an upper connecting portion 23 and a lower connecting portion 24 that connect the distal end surface of the tube portion 21 and the insertion port surface 22. The upper coupling portion 23 couples an upper position of the hole in the distal end surface of the tube portion 21 and an upper position of the hole in the insertion opening surface 22. The upper connecting portion 23 is formed at a position spaced downward from the upper edge of the front end surface of the tube portion 21. Similarly, the upper connection portion 23 is formed at a position spaced downward from the upper edge of the insertion port surface 22. The lower coupling portion 24 couples a lower position of the hole in the distal end surface of the tube portion 21 and a lower position of the hole in the insertion opening surface 22. Specifically, the lower coupling portion 24 is formed on the lower edge of the distal end surface of the tube portion 21 and the lower edge of the insertion port surface 22.

As shown in fig. 1 to 3, the second connecting portion 12 further includes a pair of wall portions 25 and 25 that connect the distal end surface of the tube portion 21 and the sides of the insertion port surface 22 to each other. The pair of wall portions 25, 25 are spaced apart from the upper coupling portion 23 in the left-right direction and spaced apart from the lower coupling portion 24 in the left-right direction. The pair of walls 25, 25 includes first walls 25a, 25a connected to the insertion opening surface 22, second walls 25b, 25b connected to the distal end surface of the tube portion 21, and partition walls 25c, 25c located between the first walls 25a, 25a and the second walls 25b, 25 b.

As shown in fig. 2, the first wall portions 25a and 25a are formed in a plate shape extending in the vertical direction. The first wall portions 25a, 25a have first restrictions 25a1, 25a1 at their upper ends that project toward the inner surface side. As shown in fig. 3, the second wall portions 25b, 25b are formed in a plate shape extending in the vertical direction. The second wall portions 25b, 25b have second restrictions 25b1, 25b1 protruding toward the inner surface side at the vertical intermediate portions of the second wall portions 25b, 25 b. As shown in fig. 2, the partition walls 25c, 25c are formed to protrude further toward the inner surface side than the inner surfaces of the first wall portions 25a, 25a and the inner surfaces of the second wall portions 25b, 25 b.

As shown in fig. 2, the second connection portion 12 further includes first guide portions 26 and 26. First guide portions 26, 26 are formed to protrude from both side surfaces of lower coupling portion 24 toward first wall portions 25a, 25 a. The first guide portions 26, 26 have a distance from the first wall portions 25a, 25 a. The upper surfaces of the first guide portions 26, 26 are inclined so that the normal lines thereof face upward and outward. That is, the upper surfaces of the first guide portions 26, 26 are inclined downward from the lower connecting portion 24 side toward the side.

As shown in fig. 3, the second connection portion 12 further includes second guide portions 27, 27. The second guide portions 27, 27 are disposed between the lower coupling portion 24 and the second wall portions 25b, 25b at a distance from the lower coupling portion 24 and the second wall portions 25b, respectively. The second guide portions 27, 27 are formed such that the inner surfaces thereof are inclined and the normal lines thereof face upward and inward.

(3-2. Structure of holder 30)

The structure of the retainer 30 will be described with reference to fig. 1, 4, and 5. As shown in fig. 1, the retainer 30 is disposed in a hole penetrating the second connection portion 12 of the connector body 10 in a direction intersecting the axial direction of the second connection portion 12. Therefore, the retainer 30 is configured not to be coaxial with the axial direction of the second connection portion 12 of the connector body 10 but to be movable in a direction intersecting the axial direction. This enables the holder 30 itself, and the portion of the connector body 10 where the holder 30 is disposed, to be reduced in size. As a result, the quick connector 1 can be downsized.

The holder 30 is formed in an inverted U shape. The holder 30 includes a base 31, a pair of first legs 32, and a pair of second legs 33, 33. The base 31 is located at the top of the inverted U shape and is formed in a slightly curved plate shape.

The pair of first leg portions 32, 32 are provided at both left and right ends of the base portion 31 on the front side of the base portion 31 so as to be expandable and deformable. The first leg portions 32, 32 are capable of allowing the annular protrusion 4a of the metal pipe 4 to pass therethrough in the expanded and deformed state. On the other hand, the first leg portions 32, 32 are locked to the annular protrusion 4a in the axial direction in an unexpanded state. The first leg portions 32, 32 are provided with first leg portion main bodies 32a and first leg portion protrusions 32 b.

The first leg body 32a is formed in a bar shape extending downward from both left and right ends of the base 31. The distal end side of the first leg body 32a is slightly bent or curved toward the opposite surface side (inner side). The first leg projection 32b is provided so as to project from the distal end side of the first leg body 32a toward the opposite surface side (inner side). The first leg projection 32b includes a tapered surface 32b1 serving as a surface on the side (front side) where the tube 4 is inserted, and a locking surface 32b2 serving as a surface on the side (back side) opposite to the side where the tube 4 is inserted.

When the tube 4 is inserted into the connector body 10, the tapered surface 32b1 can abut against the annular protrusion 4 a. The tapered surface 32b1 is inclined in a direction in which the first leg 32 expands, in addition to being inclined in a predetermined direction (vertical direction) in which the retainer 30 moves relative to the connector body 10. That is, the normal line of the tapered surface 32b1 faces the front side and upward, and faces the opposite surface side (inner side). The locking surface 32b2 is formed in a planar shape substantially orthogonal to the axial direction.

The lower surface 32b3 of the first leg protrusion 32b is formed such that its normal line is directed downward and toward the opposite surface side (inner side). The lower surface 32b3 of the first leg protrusion 32b can abut the first guide portion 26 and be guided by the first guide portion 26.

The pair of second leg portions 33, 33 are provided on the rear side of the base portion 31 at both left and right ends of the base portion 31 so as to be expandable and deformable. The second leg portions 33, 33 are provided independently of the first leg portions 32, 32. The second leg portions 33, 33 are provided on the opposite side (the back side) of the first leg portions 32, 32 from the side where the tube 4 is inserted. That is, slits 34, 34 are formed between the first leg portions 32, 32 and the second leg portions 33, 33 in the axial direction.

The second leg portions 33, 33 have a function of restricting upward movement (in a direction opposite to the predetermined direction) from the connector body 10 and a function of returning the retainer 30 to the reference position. The second leg portions 33, 33 include a second leg portion main body 33a, a second leg portion inner protrusion 33b, and a second leg portion outer protrusion 33 c.

The second leg body 33a is formed in a rod shape extending linearly downward from both left and right ends of the base 31. The second leg portion main body 33a is formed to be elastically deformable and to be elastically deformable in a direction in which the distal ends approach each other. That is, the second leg main body 33a is elastically deformed in a direction opposite to the direction in which the first leg main body 32a is elastically deformed.

The second leg inner protrusion 33b is provided to protrude from the distal end side of the second leg main body 33a toward the opposite surface side (inner side). The second leg inner protrusion 33b can abut against the annular protrusion 4a of the pipe 4 and be locked to the annular protrusion 4a in the axial direction. Both end surfaces in the axial direction of the second leg portion inner protrusion 33b are formed in a flat shape substantially orthogonal to the axial direction. The lower surface of the second leg inner protrusion 33b is formed such that the normal line thereof faces downward and the opposite surface side (inner side).

The second leg portion outer projection 33c (restricting portion) is provided so as to project from the distal end side of the second leg portion main body 33a to the side (outer side) opposite to the facing surface. The second leg portion outer protrusion 33c is locked to the second restricting portions 25b1, 25b1 of the second wall portions 25b, 25 b. That is, the second leg portion outer projection 33c has a function of restricting the movement of the retainer 30 from the connector body 10 in the direction opposite to the predetermined direction.

The lower surface of the second leg portion outer projection 33c is formed such that the normal line thereof faces downward and faces the opposite side (outer side) to the facing surface. The lower surface of the second leg outer projection 33c can abut against the second guide portion 27 and be guided by the second guide portion 27.

(4. description of operation when tube is inserted)

The operation until the metal tube 4 is inserted into the quick connector 1 and the tube 4 is completely locked by the retainer 30 will be described.

(4-1. state before tube insertion)

First, a state before the tube is inserted will be described with reference to fig. 6A to 6E. The pre-tube-insertion state is a state in which the retainer 30 is located at the reference position with respect to the connector body 10 and before the tube 4 is inserted into the connector body 10.

The retainer 30 is attached from above between the axial direction of the distal end surface of the cylindrical portion 21 of the connector body 10 and the insertion port surface 22. That is, the pair of first leg portions 32 and the pair of second leg portions 33 and 33 are press-fitted so as to straddle the upper connection portion 23. As shown in fig. 6B to 6E, the base 31 is located upward from the upper connecting portion 23 with a gap therebetween. The distance separating the base 31 and the upper coupling portion 23 in the vertical direction is a distance at which the retainer 30 can move downward (in a predetermined direction).

As shown in fig. 6B and 6D, the first wall portions 25a, 25a are disposed to face the outer surfaces of the first leg portions 32, and the exposed surfaces of the first leg portions 32, 32 are reduced to protect the first leg portions 32, 32 from the outside. As shown in fig. 6B and 6D, the upper portion of the outer surface of the first leg body 32a is disposed in a state in which a slight gap is provided between the distal end surfaces of the first restrictions 25a1, 25a1 of the first wall portions 25a, or in a state in which the upper portion abuts the distal end surfaces of the first restrictions 25a1, 25a1 of the first wall portions 25a, 25 a. Therefore, the posture of the first leg body 32a is restricted by the first restrictions 25a1, 25a 1. On the other hand, the lower portion of the outer surface of the first leg body 32a has a large clearance with the first wall portions 25a, 25 a. The distal end side of the first leg body 32a is allowed to expand and deform by an amount corresponding to the gap between the first wall portions 25a, 25 a. In other words, the first wall portions 25a, 25a limit the amount of expansion deformation of the first leg portion 32 to a predetermined amount.

As shown in fig. 6B, the tapered surface 32B1 of the first leg protrusion 32B of the first leg portion 32 faces the insertion port surface 22 side. Moreover, most of the tapered surface 32b1 is located at a position visible from the hole of the insertion opening surface 22. The lower surface 32b3 of the first leg protrusion 32b (the tip of the first leg 32) faces the first guide portion 26 with a gap therebetween.

As shown in fig. 6C and 6E, the second wall portions 25b and 25b are disposed to face the outer surfaces of the second leg portions 33 and 33, and the exposed surfaces of the second leg portions 33 and 33 are reduced to protect the second leg portions 33 and 33 from the outside. The second leg portion main body 33a is disposed with a slight gap from the second wall portions 25b and 25 b. Therefore, the second leg body 33a is restrained from expanding and deforming by the second wall portions 25b, 25 b.

Further, the second leg portion outer protrusion 33c is locked to the second restricting portions 25b1, 25b1 of the second wall portions 25b, 25 b. This regulates movement of the retainer 30 in the direction of removal (direction opposite to the predetermined direction) from the connector body 10. Further, the lower surface of the second leg portion outer projection 33c faces the second guide portion 27. In addition, the partition walls 25c, 25c are inserted into the slits 34, 34. Thereby, the posture of the holder 30 is maintained.

(4-2. pipe partially inserted state)

A partially inserted state of the tube will be described with reference to fig. 7A to 7B and fig. 8A to 8B. The pipe partially inserted state is a state in which a part of the pipe 4 is inserted, and is a state in which the pipe 4 is positioned in the middle of the axial front side of the normal position.

Fig. 7A and 7B show a state where only the distal end portion 4B of the tube 4 is inserted into the connector body 10. At this time, the distal end portion 4b of the tube 4 is about the same as the inscribed circle of the first leg protrusion 32b of the first leg 32. Therefore, the first leg portion 32 is in a state of being not deformed with increased diameter at all, or in a state of being deformed with increased diameter extremely slightly even if deformed with increased diameter. Similarly, the end portion 4b of the tube 4 is substantially the same as the inscribed circle of the second leg inner protrusion 33b of the second leg 33. Therefore, the second leg portion 33 is in a state of being not deformed with increased diameter at all, or in a state of being deformed with increased diameter extremely slightly even if deformed with increased diameter. That is, in a state where only the distal end portion 4b of the tube 4 is inserted into the connector body 10, the retainer 30 is in the same position and posture as those in the state before the tube insertion.

Fig. 8A and 8B show a state in which the pipe 4 is inserted further to the back side into the connector body 10. In fig. 8A and 8B, the annular protrusion 4a of the pipe 4 is positioned at the first leg 32.

When the tube 4 is inserted further inward, the annular protrusion 4a of the tube 4 abuts against the tapered surface 32b1 of the first leg protrusion 32b of the first leg 32. Further, an axial pressing force acts on the tapered surface 32b1 via the annular protrusion 4 a. Here, the partition walls 25c, 25c are located on the back side of the first leg body 32 a. Therefore, the first leg portion 32 is restricted from being deformed in the axial direction by the partition walls 25c, 25 c.

The normal line of the tapered surface 32b1 of the first leg protrusion 32b faces the front side and upward, and faces the opposite surface side (inner side). Therefore, a force in the expanding direction and a force in the downward direction act on the tapered surface 32b1 by the pressing force in the axial direction of the tapered surface 32b1 from the annular protrusion 4 a. The distal end side of the first leg portion 32 is expanded and deformed by the force acting in the expanding direction of the tapered surface 32b1, as shown in fig. 8A. Further, the retainer 30 is moved downward (press-in direction) from the reference position with respect to the connector body 10 by a downward force acting on the tapered surface 32b 1.

Here, when the holder 30 moves downward from the reference position with respect to the connector body 10, as shown in fig. 8A, the lower surface 32b3 of the first leg protrusion 32b of the first leg 32 abuts against the first guide portion 26. Here, the first guide portion 26 is inclined in a direction in which the first leg portion 32 expands. Therefore, the lower surface 32b3 of the first leg projection 32b abuts the first guide portion 26, and the first leg 32 is further expanded and deformed. In this way, the annular protrusion 4a of the tube 4 can pass through the first leg portion 32 in the insertion direction by the expanding deformation of the first leg portion 32.

As described above, as shown in fig. 8A, the retainer 30 moves downward from the reference position with respect to the connector body 10. Therefore, the second leg portion 33 also moves downward. At this time, as shown in fig. 8B, the lower surface of the second leg outer projection 33c is guided in a state of being in contact with the second guide portion 27. The second guide portion 27 is inclined in a direction in which the distal ends of the second leg portions 33 approach each other when the holder 30 moves downward. Therefore, the second leg portion 33 is elastically deformed in a direction in which the distal ends approach each other by being guided by the second guide portion 27. By the elastic deformation of the second leg portion 33, the second leg portion 33 accumulates elastic return energy for returning the holder 30 to the reference position.

In particular, the second leg portion 33 is elastically deformed in a direction in which the ends approach each other, which is the opposite side to the deformation direction of the first leg portion 32, as opposed to the expanding deformation of the first leg portion 32. That is, in the base portion 31, a force acts in a direction in which the first leg portion 32 expands, whereas a force acts in a direction in which the distal ends of the second leg portions 33 approach each other. In the base portion 31, the forces of both act in a canceling manner, and therefore the elastic return energy accumulated in the second leg portion 33 is not weakened by the expansion deformation of the first leg portion 32. Therefore, the elastic return energy accumulated in the second leg portion 33 can be set to a sufficiently large value.

(4-3. tube insertion completion state)

The tube insertion completion state will be described with reference to fig. 9A and 9B. The tube insertion completion state is a state in which the retainer 30 is located at the reference position, and the tube 4 is located at the normal position.

From the state of partial insertion of the tube shown in fig. 8A and 8B, the tube 4 is further inserted to the back side. Then, the annular protrusion 4a passes through the first leg portion 32 and reaches the axial gap between the first leg portion 32 and the second leg portion 33. The state where the annular projection 4a is located at this position is a state where the pipe 4 is located at a normal position.

The annular protrusion 4a passes through the first leg 32, and thus no pressing force acts on the first leg 32 from the annular protrusion 4 a. Therefore, neither a force in the diameter expansion direction nor a force in the downward direction acts on the first leg portion 32. Thus, the first leg portion 32 is restored from the expanded deformed state. That is, the amount of expansion of the first leg portion 32 is zero.

Then, in a state where the holder 30 is moved downward from the reference position, the second leg portion 33 is elastically deformed in a direction in which the distal ends approach each other, and elastic return energy is accumulated. Therefore, when the downward force no longer acts on the first leg portion 32, the retainer 30 is returned to the reference position by the upward force acting on the second leg portion 33.

In a state where the holder 30 is returned to the reference position, the annular protrusion 4a is sandwiched between the first leg portion protrusion 32b of the first leg portion 32 and the second leg portion inner protrusion 33b of the second leg portion 33 in the axial direction, so that the tube 4 is positioned in the axial direction. The annular projection 4a is opposed to the locking surface 32b2 of the first leg projection 32b of the first leg 32. Thus, the tube 4 is locked to the retainer 30 by the locking surface 32b2 being locked to the annular projection 4 a.

As described above, when inserting the tube 4 into the regular position, the operator inserts only the tube 4 without performing any operation of moving the holder 30. This is because the tube 4 can be prevented from falling off in the reference state which is a state where the holder 30 does not perform any operation. Therefore, the mountability of the tube 4 is very good.

(5. description of operation at Release time)

With reference to fig. 10A to 10B and fig. 11A to 11B, an operation of releasing the tube 4 from the normal position in a state where the metal tube 4 is inserted into the quick connector 1 will be described. When releasing the tube 4 from the normal position, first, the operator operates to move the retainer 30 downward (in the pushing direction, in the predetermined direction) from the reference position. Then, as shown in fig. 10A and 10B, the holder 30 moves.

The base 31 can move to a position where it abuts against the upper connecting portion 23. When the retainer 30 is pushed downward, the lower surface 32b3 of the first leg projection 32b of the first leg 32 abuts against the first guide portion 26. Here, the first guide portion 26 is inclined in a direction in which the first leg portion 32 expands. Therefore, the lower surface 32b3 of the first leg projection 32b abuts the first guide portion 26, and the first leg 32 is expanded and deformed. In this way, the annular protrusion 4a of the tube 4 can pass through the first leg 32 in the release direction from the normal position by the expanding deformation of the first leg 32.

At this time, as shown in fig. 10B, the lower surface of the second leg outer protrusion 33c is guided by the second guide portion 27. Since the second guide portion 27 is inclined, the second leg portion 33 is elastically deformed in a direction in which the distal ends approach each other. By the elastic deformation of the second leg portion 33, the second leg portion 33 accumulates elastic return energy for returning the holder 30 to the reference position.

In the state where the retainer 30 is thus deformed, the operator releases the tube 4. Then, the state shown in fig. 11A and 11B is achieved. Then, when the operator releases the pressing force to the base portion 31 of the retainer 30, the retainer 30 returns to the reference position by the elastic return energy accumulated in the second leg portion 33.

(6. outline, overall construction of the quick connector 2 of the second example)

The outline and the entire configuration of the quick connector 2 of the second example are substantially the same as those of the quick connector 1 of the first example, and therefore, the description thereof is omitted. Here, as shown in fig. 12, the quick connector 2 of the second example includes a connector body 50 and a retainer 70. The connector body 50 of the second example corresponds to the connector body 10 of the first example, and the retainer 70 of the second example corresponds to the retainer 30 of the first example.

(7. details of the constituent parts of the quick connector 2 of the second embodiment)

The quick connector 2 of the second example includes the connector body 50 and the retainer 70 as described above. However, the quick connector 2 includes a sealing unit, not shown, inside the connector body 50.

(7-1. Structure of connector body 50)

The structure of the connector body 10 will be described with reference to fig. 12 to 14. The connector body 50 includes a first connection portion 51 for housing the resin pipe 3 and a second connection portion 52 for inserting the metal pipe 4. First connection portion 51 is provided at one end side (the back side in fig. 12) of connector body 50, and resin pipe 3 is externally fitted to first connection portion 51. The outer peripheral surface of the first connection portion 51 is formed in a stepped shape in a direction along the flow path so as to have a retaining force in a state where the resin pipe is fitted.

The second connection portion 52 is provided on the other end side (front side in fig. 12) of the connector body 50, and is capable of inserting the distal end portion 4b and the annular protrusion 4a of the metal pipe 4. The second connection portion 52 is formed in a cylindrical shape into which the metal pipe 4 can be inserted, and has a hole penetrating in a direction (vertical direction in fig. 12) intersecting the axial direction of the pipe 4 at a portion on the insertion side (front side) of the metal pipe 4. A seal unit, not shown, is disposed on the inner peripheral side of the second connection portion 52.

As shown in fig. 12 to 14, the second connection portion 52 includes a tube portion 61 disposed on the back side. The first connection portion 51 is connected to an end of the cylindrical portion 61. The cylindrical portion 61 is provided with a seal means, and the distal end portion 4b of the metal pipe 4 is inserted. As shown in fig. 14, the distal end surface of the cylindrical portion 61 is formed in a flange shape extending radially outward from the circular opening.

As shown in fig. 12, the second connection portion 52 further includes an insertion port surface 62 coaxially arranged with a distance in the axial direction from the distal end surface of the cylindrical portion 61. The insertion port surface 62 is formed in the same outer shape as the distal end surface of the cylinder 61 and faces in the axial direction. A circular hole is formed in the center of the insertion port surface 62.

As shown in fig. 13 and 14, the second connecting portion 52 further includes an upper connecting portion 63 and a lower connecting portion 64 that connect the distal end surface of the tube portion 61 to the insertion port surface 62. The upper coupling portion 63 couples an upper position of the hole in the distal end surface of the tube portion 61 and an upper position of the hole in the insertion port surface 62. The upper connecting portion 63 is formed at a position spaced downward from the upper edge of the front end surface of the tube portion 61. Similarly, the upper connecting portion 63 is formed at a position spaced downward from the upper edge of the insertion port surface 62. The lower coupling portion 64 couples a position below the hole in the distal end surface of the tube portion 61 and a position below the hole in the insertion port surface 62. Specifically, the lower coupling portion 64 is formed on the lower edge of the distal end surface of the tube portion 61 and the lower edge of the insertion port surface 62.

As shown in fig. 12 to 14, the second connecting portion 52 further includes a pair of wall portions 65, 65 provided between the distal end surface of the tube portion 61 and the insertion port surface 62 and at the side edges of the distal end surface of the tube portion 61. The pair of wall portions 65, 65 are spaced apart from the upper coupling portion 63 in the left-right direction and are spaced apart from the lower coupling portion 64 in the left-right direction. The pair of wall portions 65, 65 include main wall portions 65b, 65b connected to the front end surface of the tube portion 61, and extension walls 65c, 65c extending from the front ends of the main wall portions 65b, 65b toward the inner surface side.

As shown in fig. 14, the main wall portions 65b, 65b are formed in a plate shape extending in the vertical direction. The main wall portions 65b and 65b have restricting portions 65b1 and 65b1 formed in a concave shape at the lower end portions thereof. As shown in fig. 13, the projecting walls 65c, 65c are formed to project from the front ends of the main wall portions 65b, 65b toward the inner surface side. The projecting walls 65c, 65c are arranged with a gap in the axial direction with the insertion port surface 62.

As shown in fig. 13, the second connection portion 52 further includes first guide portions 66, 66. The first guide portions 66, 66 are formed to protrude from the back surface of the insertion opening surface 62 toward the protruding walls 65c, 65c at a distance from both side surfaces of the lower coupling portion 64 in the left-right direction. The upper surfaces of the first guide portions 66, 66 are inclined so that the normal lines thereof face upward and outward. That is, the upper surfaces of the first guide portions 66, 66 are inclined downward from the lower connecting portion 64 side toward the left and right outer sides.

(7-2. Structure of holder 70)

The structure of the retainer 70 will be described with reference to fig. 12, 15, and 16. As shown in fig. 12, the retainer 70 is disposed in a hole penetrating the second connection portion 52 of the connector body 50 in a direction intersecting the axial direction of the second connection portion 52. Therefore, the retainer 70 is configured not to be coaxial with the axial direction of the second connection portion 52 of the connector body 50 but to be movable in a direction intersecting the axial direction. This enables the holder 70 itself, and the portion of the connector body 50 where the holder 70 is disposed, to be reduced in size. As a result, the quick connector 2 can be downsized.

The holder 70 is formed in an inverted U shape. The holder 70 includes a base 71, a pair of first legs 72 and 72, and a pair of second legs 73 and 73. The base portion 71 is located at the top of the inverted U shape and is formed in a slightly curved plate shape.

The pair of first leg portions 72, 72 are provided at both left and right ends of the base portion 71 on the front side of the base portion 71 so as to be expandable and deformable. The first leg portions 72, 72 can pass the annular protrusion 4a of the metal pipe 4 in the expanded and deformed state. On the other hand, the first leg portions 72, 72 are locked to the annular protrusion 4a in the axial direction in an unexpanded state. The first leg portions 72, 72 are provided with a first leg portion main body 72a and a first leg portion protrusion 72 b.

The first leg body 72a is formed in a rod shape extending linearly downward from both left and right ends of the base 71. The first leg portion protrusion 72b is provided so as to protrude from the distal end side of the first leg portion body 72a toward the opposite surface side (inner side). The first leg projection 72b includes a tapered surface 72b1 as a surface on the side (front side) where the tube 4 is inserted and an engaging surface 72b2 as a surface on the side (back side) opposite to the side where the tube 4 is inserted.

When the tube 4 is inserted into the connector body 50, the tapered surface 72b1 can abut against the annular protrusion 4 a. Tapered surface 72b1 is sloped in the direction in which first leg 72 expands. That is, the normal line of the tapered surface 72b1 faces the front side and the opposite surface side (inner side). The locking surface 72b2 is formed in a planar shape substantially orthogonal to the axial direction.

The lower surface 72b3 of the first leg projection 72b is formed such that the normal line thereof faces downward and the opposite surface side (inner side). The lower surface 72b3 of the first leg protrusion 72b can abut the first guide portion 66 and be guided by the first guide portion 66.

The pair of second leg portions 73, 73 are provided on the rear side of the base portion 71 at both left and right ends of the base portion 71 so as to be expandable and deformable. The second leg portions 73, 73 are provided independently of the first leg portions 72, 72. The second leg portions 73, 73 are provided on the side (the back side) opposite to the side where the tube 4 is inserted with respect to the first leg portions 72, 72. That is, slits 74, 74 are formed between the first leg portions 72, 72 and the second leg portions 73, 73 in the axial direction.

The second leg portions 73, 73 have a function of restricting upward movement (in a direction opposite to the predetermined direction) from the connector body 50. The second legs 73, 73 include a second leg body 73a, a second leg inner projection 73b, and a second leg outer projection 73 c.

The second leg body 73a is formed in a rod shape extending linearly downward from both left and right ends of the base 71. The second leg body 73a is formed to be elastically deformable and to be elastically deformable in a direction in which the distal ends approach each other. That is, the second leg body 73a is elastically deformed in a direction opposite to the direction in which the first leg body 72a is elastically deformed.

The second leg inner projection 73b is provided so as to project from the distal end side of the second leg body 73a toward the opposite surface side (inner side). The second leg inner projection 73b can abut against the annular projection 4a of the tube 4 and can be axially locked to the annular projection 4 a. Both end surfaces in the axial direction of the second leg inner projection 73b are formed in a flat shape substantially orthogonal to the axial direction. The lower surface of the second leg inner protrusion 73b is formed such that the normal line thereof faces downward and the opposite surface side (inner side).

The second leg outer projection 73c (restricting portion) is provided so as to project from the distal end side of the second leg body 73a to the side (outer side) opposite to the facing surface. The second leg outer protrusion 73c is locked to the restricting portions 65b1, 65b1 of the main wall portions 65b, 65 b. That is, the second leg outer projection 73c has a function of restricting the movement of the retainer 70 from the connector body 50 in the direction opposite to the predetermined direction.

(8 description of operation when inserting tube)

The operation until the metal tube 4 is inserted into the quick connector 2 and the tube 4 is completely locked by the retainer 70 will be described.

(8-1. state before tube insertion)

First, a state before the tube is inserted will be described with reference to fig. 17A to 17E. The tube before-insertion state is a state in which the retainer 70 is located at the reference position with respect to the connector body 50 and before the tube 4 is inserted into the connector body 50.

The retainer 70 is attached from above between the front end surface of the cylindrical portion 61 of the connector body 50 and the insertion opening surface 62 in the axial direction. That is, the pair of first leg portions 72 and the pair of second leg portions 73 and 73 are press-fitted so as to straddle the upper coupling portion 63. As shown in fig. 17B to 17E, the base portion 71 is located upward from the upper connecting portion 63 with a gap therebetween. The vertical distance between the base 71 and the upper coupling portion 63 is a distance by which the retainer 70 can move downward (in a predetermined direction).

As shown in fig. 17B and 17D, the first leg portions 72, 72 are disposed between the insertion opening surface 62 and the protruding walls 65c, 65 c. That is, the outer surfaces of the first leg portions 72a and 72a are exposed laterally. As shown in fig. 17B, the tapered surface 72B1 of the first leg projection 72B faces the insertion port surface 62 side. Moreover, most of the tapered surface 72b1 is located at a position visible from the hole of the insertion opening surface 62. The lower surface 72b3 of the first leg protrusion 72b (the tip of the first leg 72) is opposed to the first guide portion 66.

As shown in fig. 17C and 17E, the main wall portions 65b and 65b are disposed to face the outer surfaces of the second leg portions 73 and 73, and the exposed surfaces of the second leg portions 73 and 73 are reduced to protect the second leg portions 73 and 73 from the outside. The second leg body 73a is disposed with a slight gap from the main wall portions 65b and 65 b. Therefore, the second leg body 73a is restrained from expanding and deforming by the main wall portions 65b, 65 b.

Further, the second leg outer protrusion 73c is locked to the restricting portions 65b1, 65b1 of the main wall portions 65b, 65 b. This regulates movement of the retainer 70 in the withdrawal direction (direction opposite to the predetermined direction) with respect to the connector body 50. In addition, the projecting walls 65c, 65c are inserted into the slits 74, 74. Thereby, the posture of the holder 70 is maintained.

(8-2. tube partially inserted state)

A partially inserted state of the tube will be described with reference to fig. 18A to 18B and fig. 19A to 19B. The pipe partially inserted state is a state in which a part of the pipe 4 is inserted, and is a state in which the pipe 4 is positioned in the middle of the axial front side of the normal position.

Fig. 18A and 18B show a state in which only the distal end portion 4B of the tube 4 is inserted into the connector body 50. At this time, the terminal portion 4b of the tube 4 is about the same as the inscribed circle of the first leg protrusion 72b of the first leg 72. Therefore, the first leg portion 72 is in a state of being not deformed with increased diameter at all, or in a state of being deformed with increased diameter extremely slightly even if deformed with increased diameter. Similarly, the end portion 4b of the tube 4 is substantially the same as the inscribed circle of the second leg inner protrusion 73b of the second leg 73. Therefore, the second leg portion 73 is in a state of being not deformed with increased diameter at all, or in a state of being deformed with increased diameter extremely slightly even if deformed with increased diameter. That is, in a state where only the distal end portion 4b of the tube 4 is inserted into the connector body 50, the retainer 70 is in the same position and posture as those in the state before the tube is inserted.

Fig. 19A and 19B show a state in which the pipe 4 is inserted further to the back side into the connector body 50. In fig. 19A and 19B, the annular protrusion 4a of the tube 4 is positioned at the position of the first leg portion 72.

When the tube 4 is inserted further inward, the annular protrusion 4a of the tube 4 abuts against the tapered surface 72b1 of the first leg protrusion 72b of the first leg 72. Further, an axial pressing force acts on the tapered surface 72b1 by the annular protrusion 4 a. Here, the projecting walls 65c, 65c are located on the back side of the first leg main body 72 a. Therefore, the first leg 72 is restricted from being deformed in the axial direction by the projecting walls 65c, 65 c.

The normal line of the tapered surface 72b1 of the first leg projection 72b is directed to the front side and to the opposite surface side (inner side). Therefore, a force in the expanding direction acts on the tapered surface 72b1 by the pressing force in the axial direction of the annular protrusion 4a against the tapered surface 72b 1. By the force acting in the expanding direction of the tapered surface 72b1, the distal end side of the first leg portion 72 is expanded and deformed as shown in fig. 19A. At this time, the first leg portion 72 is expanded and deformed in a state of non-contact with the first guide portion 66. Then, the annular protrusion 4a of the tube 4 can pass through the first leg portion 72 in the insertion direction by the expanding deformation of the first leg portion 72. The second leg outer projection 73c of the second leg 73 is retained by the restricting portions 65b1, 65b1 of the main wall portions 65b, 65 b.

(8-3. tube insertion completion state)

The tube insertion completion state will be described with reference to fig. 20A and 20B. The tube insertion completion state is a state in which the holder 70 is located at the reference position, and is a state in which the tube 4 is located at the normal position.

From the state of the pipe partially inserted shown in fig. 19A and 19B, the pipe 4 is further inserted to the back side. Then, the annular protrusion 4a passes through the first leg portion 72 and reaches the axial gap between the first leg portion 72 and the second leg portion 73. The state where the annular projection 4a is located at this position is a state where the pipe 4 is located at a normal position.

Since the annular protrusion 4a passes through the first leg portion 72, no pressing force acts on the first leg portion 72 from the annular protrusion 4 a. Therefore, the force in the diameter expansion direction does not act on the first leg portion 72. Thus, the first leg portion 72 is restored from the expanded deformed state. That is, the amount of expansion of the first leg portion 72 is zero.

In a state where the holder 70 is returned to the reference position, the annular protrusion 4a is sandwiched between the first leg protrusion 72b of the first leg 72 and the second leg inner protrusion 73b of the second leg 73 in the axial direction, and the tube 4 is positioned in the axial direction. The annular projection 4a is opposed to the locking surface 72b2 of the first leg projection 72b of the first leg 72. Thus, the tube 4 is locked to the retainer 70 by the locking surface 72b2 being locked to the annular projection 4 a.

As described above, when inserting the tube 4 into the regular position, the operator inserts only the tube 4 without performing any operation of moving the holder 70. This is because the tube 4 can be prevented from falling off in the reference state which is a state where the holder 70 does not perform any operation. Therefore, the mountability of the tube 4 is very good.

(9. description of operation at Release time)

With reference to fig. 21A to 21B and 22A to 22B, an operation of releasing the pipe 4 from the normal position in a state where the metal pipe 4 is inserted into the quick connector 2 will be described. When releasing the tube 4 from the normal position, first, the operator operates to move the holder 70 downward (in the pushing direction, in the predetermined direction) from the reference position. Then, as shown in fig. 21A and 21B, the holder 70 moves.

The base portion 71 can move to a position where it abuts against the upper coupling portion 63. When the retainer 70 is pushed downward, the lower surface 72b3 of the first leg projection 72b of the first leg 72 abuts the first guide portion 66. Here, the first guide portion 66 is inclined in a direction in which the first leg portion 72 expands. Therefore, the lower surface 72b3 of the first leg projection 72b abuts the first guide portion 66, and the first leg 72 is expanded and deformed. In this way, the annular protrusion 4a of the tube 4 can pass through the first leg portion 72 in the release direction from the normal position by the expanding deformation of the first leg portion 72.

In the state where the retainer 70 is thus deformed, the operator releases the tube 4. Then, the state shown in fig. 22A and 22B is achieved. Then, when the operator releases the pressing force to the base portion 71 of the holder 70, the holder 70 returns to the reference position by the elastic return energy accumulated in the second leg portion 73.

Description of the reference numerals

1. 2: a quick connector; 3. 4: a tube; 4 a: an annular protrusion; 4 b: a terminal portion; 4 c: an intermediate portion; 10: a connector body; 11: a first connection portion; 12: a second connecting portion; 21: a barrel portion; 22: inserting into the mouth face; 23: an upper connecting portion; 24: a lower connecting portion; 25: a wall portion; 25 a: a first wall portion; 25a 1: a first restriction section; 25 b: a second wall portion; 25b 1: a second restriction portion; 25 c: a partition wall; 26: a first guide portion; 27: a second guide portion; 30: a holder; 31: a base; 32: a first leg portion; 32 a: a first leg body; 32 b: a first leg protrusion; 32b 1: a conical surface; 32b 2: a clamping surface; 32b 3: a lower surface; 33: a second leg portion; 33 a: a second leg body; 33 b: a second leg inner protrusion; 33 c: a second leg outer protrusion; 34: a slit; 50: a connector body; 51: a first connection portion; 52: a second connecting portion; 61: a barrel portion; 62: inserting into the mouth face; 63: an upper connecting portion; 64: a lower connecting portion; 65: a wall portion; 65 b: a main wall portion; 65b 1: a restricting section; 65 c: the wall is extended; 66: a first guide portion; 70: a holder; 71: a base; 72: a first leg portion; 72 a: a first leg body; 72 b: a first leg protrusion; 72b 1: a conical surface; 72b 2: a clamping surface; 72b 3: a lower surface; 73: a second leg portion; 73 a: a second leg body; 73 b: a second leg inner protrusion; 73 c: a second leg outer protrusion; 74: a slit.