阅读说明：本技术 螺母以及螺母的固定结构 (Nut and nut fixing structure ) 是由 松并重树 古贺一博 小岛刚 星野直树 吉田讬也 于 2019-06-13 设计创作，主要内容包括：为了降低将螺母压入到板材时所需的载荷,螺母具备：基部(2),其具有内螺纹(18)；筒状的突出部(3),其从所述基部的一面突出；以及多个脚部(4),它们从所述突出部的外周面侧突出,所述脚部的靠近所述突出部的端部形成为：宽度从前端部侧朝向突出部侧逐渐扩大,并且该端部的两外侧在俯视观察时呈弧状。(In order to reduce the load required when the nut is pressed into the plate material, the nut is provided with: a base (2) having an internal thread (18); a cylindrical protruding portion (3) protruding from one surface of the base portion; and a plurality of leg portions (4) protruding from an outer peripheral surface side of the protruding portion, end portions of the leg portions near the protruding portion being formed such that: the width gradually increases from the front end portion side toward the protruding portion side, and both outer sides of the end portion are arc-shaped in a plan view.)

1. A nut is provided with: a base having an internal thread; a cylindrical protruding portion protruding from one surface of the base portion; and a plurality of leg portions protruding from an outer peripheral surface side of the protruding portion,

an end portion of the foot portion near the protruding portion is formed as: the two outer sides of the end part are arc-shaped when viewed from the top.

2. The nut according to claim 1,

the outer periphery of the protruding portion is formed such that: the diameter becomes smaller toward the base side.

3. The nut according to claim 1 or 2,

the volume of a portion of the leg portion that protrudes outward beyond the maximum outer peripheral portion of the protruding portion in plan view is equal to or less than the volume of a housing space provided in: and a portion located inside the largest outer peripheral portion of the protruding portion in a plan view and between the adjacent leg portions in a plan view.

4. A nut fixing structure, wherein the nut is the nut according to any one of claims 1 to 3,

in the kit having the bottom hole larger than the maximum outer circumference of the projection of the nut, the nut is fixed to the kit so that the kit is not deformed by the projection but is deformed by the leg.

Technical Field

The present invention relates to a nut and a nut fixing structure.

Background

As described in patent document 1, a technique for fixing a nut to a kit is known. In this case, the nut is attached to the kit by press fitting and embedding. Since it is necessary to prevent the nut attached to the mating member from rotating or falling off, the nut is firmly buried in the mating member.

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-113396

However, in the conventional nut, since a load required for press-fitting is large, it is desired to reduce the load. If the load required for press-fitting can be successfully reduced, unnecessary deformation of the mating member can be suppressed.

Disclosure of Invention

The present inventors have conducted earnest studies to solve this problem. The subject of the invention is: the load required to press the nut into the mating component is reduced.

In order to solve the above problem, the present invention provides a nut including: a base having an internal thread; a cylindrical protruding portion protruding from one surface of the base portion; and a plurality of leg portions protruding from an outer peripheral surface side of the protruding portion, end portions of the leg portions near the protruding portion being formed as: the width gradually increases from the front end portion side toward the protruding portion side, and both outer sides of the end portion are arc-shaped in a plan view.

In addition, preferably, the outer periphery of the protruding portion is formed as: the diameter becomes smaller toward the base side.

In addition, it is preferable that the following structure is formed: the volume of the portion of the leg portion that protrudes outward beyond the maximum outer peripheral portion of the protruding portion in plan view is equal to or less than the volume of a storage space provided in: a portion located further inward than the maximum outer peripheral portion of the protruding portion in a plan view and located between the adjacent leg portions in a plan view.

Preferably, the nut is fixed to the kit having the bottom hole larger than the maximum outer circumference of the protruding portion of the nut so that the kit is not deformed by the protruding portion but is deformed by the leg portion.

According to the present invention, the load required when the nut is pressed into the plate material can be reduced.

Drawings

Fig. 1 is a perspective view of a nut as an example of the embodiment.

Fig. 2 is a cross-sectional view showing a part of the nut shown in fig. 1 on the side of the protruding portion.

Fig. 3 is a view showing a part of the III-III section of fig. 2.

Fig. 4 is a view showing a state in which a plate material is placed on the leg portion of the nut.

Fig. 5 is a view showing a pressurizable portion of the nut shown in fig. 1. Wherein (a) is a cross-sectional view as viewed from the side, and (b) is a plan view, in (b), the bottom hole of the plate material is indicated by a two-dot chain line, and a broken line indicated at a position inside the maximum outer peripheral portion indicates: the shape of the end portion on the base portion side of the leg portion and the shape of the other end portion side of the leg portion.

Fig. 6 is a view showing a housing space in the nut shown in fig. 1 by coloring. Wherein (a) is a cross-sectional view as viewed from the side, and (b) is a plan view, in (b), the bottom hole of the plate material is indicated by a two-dot chain line, and a broken line indicated at a position inside the maximum outer peripheral portion indicates: the shape of the end portion on the base portion side of the leg portion and the shape of the other end portion side of the leg portion. In addition, an example of a direction in which a part of the plate material moves is shown by a hollow arrow.

Fig. 7 is a cross-sectional view showing a part of a protruding portion side of the nut in which the tip end side of the leg portion has an isosceles trapezoid shape.

Fig. 8 is a view showing a part of the section VIII-VIII of fig. 7.

Fig. 9 is a cross-sectional view showing a part of the protrusion side of the nut having a rectangular shape in side view on the distal end side of the leg portion.

Fig. 10 is a view showing a part of the X-X cross section of fig. 9.

Detailed Description

The following shows modes for carrying out the invention. In the following, the iron nut 1 for fastening will be described as an example. As is apparent from fig. 1 to 3, the nut 1 of the embodiment includes: a base 2 having an internal thread 18; a cylindrical projecting portion 3 projecting from one surface of the base portion 2; a plurality of leg portions 4 protruding from the outer peripheral surface side of the protruding portion 3, wherein the end portions of the leg portions 4 near the protruding portion 3 are formed as follows: the width of the projection gradually increases from the front end side toward the projection 3, and both outer sides of the end are arc-shaped in plan view. Therefore, the portion deformed by the leg portion 4 is easily moved to the valley portion 11 formed between the leg portion 4 and the leg portion 4, and thereby the load required when the nut 1 is pressed into the mating component can be reduced.

The nut 1 of the embodiment includes: a cylindrical base 2 formed such that both end surfaces are substantially parallel; and a projection 3 extending from one surface side of the base 2. Further, a leg portion 4 is provided so as to be continuous with the base portion 2 and the protruding portion 3. The nut 1 of the embodiment is configured as follows: the central axis of the base 2 coincides with the central axis C of the protrusion 3. In the embodiment, a part of the protruding portion 3 is provided with a female screw in addition to the female screw 18 of the base portion 2. Therefore, the thickness of the base 2 can be suppressed, and the portion in contact with the male screw can be increased.

The leg portion 4 provided in such a manner as to be connected to the protruding portion 3 is a portion for deforming the kit and also a portion for suppressing rotation of the nut 1 with respect to the kit. Therefore, the leg portion 4 is formed to extend outward from the outer peripheral surface of the protruding portion 3, and a plurality of leg portions 4 are provided. The leg 4 of the embodiment is provided with: the protrusions 3 are equally spaced from the outer peripheral surface thereof in the circumferential direction and are configured to have the same shape.

In the embodiment, when the nut 1 formed in this way is attached to the plate member 9 as a kit, the plate member 9 is brought into contact with the leg portion 4 as shown in fig. 4, and then pressurized. Then, a part of the relatively flexible plate material 9 such as aluminum or stainless steel is deformed. At this point, a portion of the sheet 9 is about to move to break free of the force. A part of the plate material 9 is moved along the leg portion 4, and is easily moved to a valley portion 11 formed between the leg portion 4 and the leg portion 4. In the embodiment, the valley portion 11 having a substantially U-shape in plan view is formed by the outer peripheral surfaces of the adjacent leg portion 4 and the protrusion portion 3.

In addition, the nut 1 of the embodiment is formed such that: the diameter of the outer periphery of the protruding portion 3 becomes smaller toward the base portion 2 side. The protruding portion 3 is formed to be expanded in diameter toward the open end when viewed from the base portion 2 side. Therefore, even if the nut 1 attempts to move in the axial direction so as to be separated from the plate member 9 after the plate member 9 moves to the projecting portion 3 side, the movement of the nut 1 can be suppressed by the portion that moves to the valley portion 11 abutting against the projecting portion 3. Further, in the embodiment, the front end portion of the projection 3 of the nut 1 is a maximum outer peripheral portion 31 having the largest outer peripheral diameter.

As is apparent from fig. 5, the leg portion 4 of the embodiment includes the pressurizable portion 13, and the pressurizable portion 13 is a portion that protrudes outward from the maximum outer peripheral portion 31 of the protruding portion 3 in a plan view, and the plate member 9 is deformed by this portion. Therefore, the size of the deformation of the plate material 9 inevitably depends on the size of the pressable portion 13. In fig. 5, the pressable portion 13 is a portion in which the leg portion 4 is hatched.

As shown in fig. 6, the nut 1 of the embodiment is provided with a housing space 12 in a portion located inside the largest outer peripheral portion 31 of the protruding portion 3 in a plan view and between the adjacent leg portions 4 in a plan view. The portion between the legs 4 in the plan view referred to herein does not mean: between the feet 4 in a section cut perpendicularly to the axial direction. The portion where the foot portion 4 exists when the cross section is cut perpendicular to the axial direction means: the area which is considered to be between the adjacent feet 4, with respect to the portion where the feet 4 are not present when cut perpendicularly to the axial direction, is the following area: the portion of the foot 4 at the position farthest from the base 2 is regarded as a dividing line.

The housing space 12 is a space into which the plate member 9 is deformed and flows. The storage space 12 of the embodiment extends from the base portion 2 to the maximum outer peripheral portion 31 in a side view, and is a substantially triangular region in a side view in the example shown in fig. 6. In the nut 1 of the embodiment, the volume of the portion of the leg portion 4 protruding outward from the maximum outer peripheral portion 31 of the protruding portion 3 in a plan view is equal to or less than the volume of the housing space 12, and the housing space 12 is provided: a portion located inward of the maximum outer peripheral portion 31 of the protruding portion 3 in a plan view and between the adjacent leg portions 4 in a plan view. Therefore, the volume of the housing space 12 can be secured in an appropriate size.

In the embodiment, it is assumed that the number of the housing spaces 12 is the same as the number of the leg portions 4. The storage space 12 is a space capable of storing a part of the deformed plate material 9, and at least a part of the space between the adjacent leg portions 4 forms a part of the storage space 12.

The front end portion side of the leg portion 4 of the example shown in fig. 2 and 3 is formed in a rectangular shape in a plan view. The sides of the rectangular portion are arranged parallel to each other so that it is possible to make it difficult for the nut 1 to move relative to the mating part. Further, the front end of the leg portion 4 includes: the inclined surface 41 is inclined so as to be farther from the central axis C toward the base 2. By providing such an inclined surface 41, the deformation area of the plate material 9 can be gradually increased when the nut 1 and the plate material 9 are fixed, and the die life can be improved.

The front end side of the leg portion 4 of the example shown in fig. 7 and 8 is formed into an isosceles trapezoid in a plan view. In this example, the front end of the leg portion 4 also includes: the inclined surface 41 is inclined so as to be farther from the central axis C toward the base 2.

The front end portion side of the leg portion 4 of the example shown in fig. 9 and 10 is formed in a rectangular shape in a plan view. The sides of the rectangular portions are arranged parallel to each other, so that the nut 1 can be made difficult to move relative to the mating member, as in the example shown in fig. 2 and 3. The front end of the leg 4 is formed in a rectangular shape in side view. By forming the tip end in this manner, the caulking strength can be improved.

The fixing structure of the nut 1 according to the embodiment includes: the protruding part 3 can be inserted into the bottom hole 91 of the plate material 9. The bottom hole 91 is constituted by: larger than the largest outer circumference of the projection 3. Therefore, the plate member 9 can be formed in a state of being in contact with the leg portion 4 without being deformed by the protruding portion 3. The bottom hole 91 is set to the following size: the plurality of leg portions 4 arranged radially can contact the plate material 9 in a state where the protruding portion 3 is housed, and when the nut 1 and the plate material 9 are fixed, the plurality of leg portions 4 are pressed against the plate material 9, and the plate material 9 is deformed by the leg portions 4. Therefore, if a force pressing the plate material 9 is applied to the leg portion 4, the plate material 9 and the nut 1 can be fixed, and therefore, the force required for the fixation can be suppressed. Further, when the plate member 9 receives a force, a part of the plate member 9 tends to move toward the inside of the bottom hole 91, but since a gap exists between the protruding portion 3 and the plate member 9, the movement becomes easy.

Further, if the volume of the portion of the leg portion 4 projecting outward from the maximum outer peripheral portion 31 of the projecting portion 3 in plan view is set to be equal to or less than the volume of the storage space 12, the space inside the bottom hole 91 is substantially larger than the volume of the pressurizable portion 13 in consideration of the difference in the size between the bottom hole 91 and the maximum outer periphery of the projecting portion 3, and therefore, it is possible to suppress the obstruction of the movement of the plate member 9, and the storage space 12 is provided: a portion located inward of the maximum outer peripheral portion 31 of the protruding portion 3 in a plan view and between the adjacent leg portions 4 in a plan view. As a result, the force required for fixing the nut 1 and the plate member 9 can be suppressed.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, the nut is not necessarily made of iron, and may be made of other materials. Among them, metal is preferable.

The protrusion may not be provided with an internal thread. In this case, only the base portion can be screwed with the male screw.

In addition, the base does not have to be cylindrical. For example, the shape may be a square tube or the like having a square or hexagonal shape in a plan view.

The internal threads provided in the base may be non-through internal threads, such as a pocket nut, in addition to through internal threads.

Description of the reference numerals

1 nut

2 base part

3 projecting part

4 feet

9 sheet material

11 trough part

12 storage space

13 pressurizable part

18 internal screw thread

31 largest outer peripheral portion

41 inclined plane

91 bottom hole

The claims (modification according to treaty clause 19)

(amendment) A nut, comprising: a base having an internal thread; a cylindrical protruding portion protruding from one surface of the base portion; and a plurality of leg portions protruding from an outer peripheral surface side of the protruding portion,

an end portion of the foot portion near the protruding portion is formed as: the two outer sides of the end part are arc-shaped in the plan view,

the volume of a portion of the leg portion that protrudes outward beyond the maximum outer peripheral portion of the protruding portion in plan view is equal to or less than the volume of a housing space provided in: and a portion located inside the largest outer peripheral portion of the protruding portion in a plan view and between the adjacent leg portions in a plan view.

2. The nut according to claim 1,

the outer periphery of the protruding portion is formed such that: the diameter becomes smaller toward the base side.

(deletion)

(modification) A fixing structure of a nut, wherein the nut is the nut of claim 1 or 2,

in the kit having the bottom hole larger than the maximum outer circumference of the projection of the nut, the nut is fixed to the kit so that the kit is not deformed by the projection but is deformed by the leg.