阅读说明：本技术 密封垫 (Sealing gasket ) 是由 萩原直树 于 2019-11-27 设计创作，主要内容包括：本发明提供即使是在密封垫的压缩幅度变大的情况下也能够进一步提升耐久性的密封垫。密封垫(1)包括：围绕轴线(Y1)呈环状的加强环(10)；围绕轴线(Y1)呈环状的基部(20),由弹性体形成,加强环(10)埋入基部(20)中；和围绕轴线(Y1)呈环状的密封唇部(21),在基部(20)的内周侧处与基部(20)一体形成。密封唇部(21)具有：作为一侧密封唇部的上侧密封唇部(22),随着朝向轴线(Y1)方向的一侧而向内周侧延伸；和作为另一侧密封唇部的下侧密封唇部(23),随着朝向轴线(Y1)方向的另一侧而向内周侧延伸。基部(20)的径向上的宽度和密封唇部(21)的径向上的宽度加在一起的宽度比基部(20)的轴线(Y1)方向上的厚度大。(The invention provides a gasket which can further improve the durability even under the condition that the compression amplitude of the gasket is increased. A gasket (1) is provided with: a reinforcement ring (10) annular about an axis (Y1); a base (20) that is annular about an axis (Y1) and is formed of an elastomer, the reinforcement ring (10) being embedded in the base (20); and a seal lip portion (21) that is annular about an axis (Y1) and that is formed integrally with the base portion (20) at the inner peripheral side of the base portion (20). The seal lip (21) has: an upper sealing lip (22) as one side sealing lip, extending to the inner peripheral side along one side facing to the direction of the axis (Y1); and a lower sealing lip portion (23) as the other side sealing lip portion, extending to the inner peripheral side along the other side of the direction of the axis (Y1). The width of the base (20) in the radial direction and the width of the sealing lip (21) in the radial direction are combined to be larger than the thickness of the base (20) in the direction of the axis (Y1).)

1. A gasket, comprising:

a reinforcement ring annular about an axis;

a base portion annular about an axis and formed of an elastomer, the reinforcing ring being embedded in the base portion; and

a seal lip portion annular around an axis, formed integrally with the base portion at an inner peripheral side of the base portion,

the sealing lip has: a one-side seal lip portion extending toward the inner peripheral side with facing one side in the axial direction; and the other side seal lip portion extending toward the inner peripheral side with facing the other side in the axial direction,

the width in the radial direction of the base portion and the width in the radial direction of the sealing lip portion added together is larger than the thickness in the axial direction of the base portion.

2. A gasket according to claim 1,

the width in the radial direction of the reinforcing ring is the same as the width in the radial direction of the seal lip.

3. A sealing gasket according to claim 1 or 2,

the reinforcement ring is embedded in a substantially central portion of the base in the axial direction.

4. A gasket according to claim 3,

a reinforcing ring pressing hole for disposing the reinforcing ring at a substantially central portion in an axial direction is formed in the base portion.

5. A sealing gasket according to any one of claims 1 to 4,

the substantially central portion of the base portion in the axial direction has at least one outer peripheral lip portion protruding from an outer peripheral portion of the base portion toward an outer peripheral side.

Technical Field

The present invention relates to a gasket.

Background

Conventionally, a gasket in which a gasket main body portion is integrally molded with a reinforcing ring that is annular around an axis is widely used. As such a gasket, for example, a gasket having at least two sealing lips which are respectively brought into contact with one member on one side of a sealing object and the other member on the other side of the sealing object is provided between the one member and the other member to be sealed (for example, see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. H07-269711

Disclosure of Invention

Technical problem to be solved by the invention

However, the depth of the housing portion of the gasket provided between the member on the one side and the member on the other side to be sealed may vary greatly in terms of manufacturing. In such a case, if the depth of the housing portion of the gasket is reduced to increase the compression width of the gasket, the gasket is excessively compressed, and therefore, there is room for further improvement in the durability of the gasket. That is, if the variation in the compression width of the gasket due to the excessive compression can be alleviated, the durability of the gasket can be further improved. As described above, a structure is required which can further improve the durability of the gasket even when the compression width of the gasket is increased as compared with the conventional gasket.

The present invention has been made in view of the above problems, and an object thereof is to provide a gasket which can further improve durability even when the compression width of the gasket is increased.

Means for solving the technical problem

In order to achieve the above object, a gasket according to the present invention includes: a reinforcement ring annular about an axis; a base portion annular about an axis and formed of an elastomer, the reinforcing ring being embedded in the base portion; and a seal lip portion that is annular around an axis, is formed integrally with the base portion at an inner peripheral side of the base portion, and has: a one-side seal lip portion extending toward the inner peripheral side with facing one side in the axial direction; and another side seal lip portion extending toward the inner peripheral side toward the other side in the axial direction, a width in which a width in the radial direction of the base portion and a width in the radial direction of the seal lip portion are added together being larger than a thickness in the axial direction of the base portion.

In the gasket according to one aspect of the present invention, a width of the reinforcement ring in the radial direction is the same as a width of the seal lip in the radial direction.

In the gasket according to one aspect of the present invention, the reinforcement ring is embedded in a substantially central portion of the base portion in the axial direction.

In the gasket according to one aspect of the present invention, a reinforcement ring pressing hole for disposing the reinforcement ring at a substantially central portion in an axial direction is formed in the base portion.

In the gasket according to one aspect of the present invention, the substantially central portion of the base portion in the axial direction has an outer peripheral lip portion protruding from an outer peripheral portion of the base portion toward an outer peripheral side.

Effects of the invention

According to the gasket of the present invention, the durability can be further improved even when the compression width of the gasket is increased.

Drawings

Fig. 1 is a plan view showing a schematic structure of a gasket according to an embodiment of the present invention.

Fig. 2 is a front view showing a schematic structure of a gasket according to an embodiment of the present invention.

Fig. 3 is a rear view showing a schematic structure of a gasket according to an embodiment of the present invention.

Fig. 4 is a left side view showing a schematic structure of a gasket according to an embodiment of the present invention.

Fig. 5 is a right side view showing a schematic structure of the gasket according to the embodiment of the present invention.

Fig. 6 is a bottom view showing a schematic structure of a gasket according to an embodiment of the present invention.

Fig. 7 is a sectional view a-a of the gasket of the embodiment of the present invention shown in fig. 1.

Fig. 8 is a B-B sectional view of the gasket of the embodiment of the present invention shown in fig. 1.

Fig. 9 is a cross-sectional view showing a state in which the gasket according to the embodiment of the present invention is assembled between the upper member and the lower member to be sealed.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view showing a schematic structure of a gasket 1 according to an embodiment of the present invention, and fig. 2 is a front view showing the schematic structure of the gasket 1. Fig. 3 is a rear view showing a schematic structure of the gasket 1, and fig. 4 is a left side view showing a schematic structure of the gasket 1. Fig. 5 is a right side view showing a schematic structure of the gasket 1, and fig. 6 is a bottom view showing the schematic structure of the gasket 1. Fig. 7 is a sectional view a-a of the gasket according to the embodiment of the present invention shown in fig. 1, and fig. 8 is a sectional view B-B of the gasket according to the embodiment of the present invention shown in fig. 1. It should be noted that the rear view, the left view, and the right view appear the same as the main view.

For convenience of explanation, one side (arrow a direction) in the direction of the axis Y1 (hereinafter, also referred to as the axis Y1 direction) which is the axis of the gasket 1 in fig. 1 to 8 is referred to as an upper side, and the other side (arrow b direction) is referred to as a lower side. In addition, one side (arrow c direction) in the radial direction extending perpendicular to the axis Y1 of the gasket 1 in fig. 1 to 8 is an inner peripheral side, and the other side (arrow d direction) is an outer peripheral side. In the following description, the positional relationship and the direction of each member will be described using the following description, but the positional relationship and the direction in the drawings are merely illustrated, and the positional relationship and the direction when the member is incorporated in an actual vehicle or the like are not illustrated.

The gasket 1 according to the embodiment of the present invention functions to seal gaps of various flow paths such as a cooling water passage of EGR (exhaust Gas Recirculation) in a vehicle such as an automobile. The object to which the gasket 1 according to the embodiment of the present invention is applied is not limited to the above.

The gasket 1 of the embodiment of the present invention includes: a reinforcement ring 10 annular about axis Y1; a base 20, annular about an axis Y1, formed of an elastomer, reinforcing ring 10 being embedded in base 20; and a seal lip portion 21 annular about the axis Y1, formed integrally with the base portion 20 at the inner peripheral side (arrow c direction) of the base portion 20.

The seal lip 21 has: an upper seal lip portion 22 as one side seal lip portion extending toward the inner peripheral side with the side (upper side (arrow a direction)) facing the direction of the axis Y1; and a lower seal lip portion 23 as the other side seal lip portion extending toward the inner peripheral side with facing the other side (lower side (arrow b direction)) in the direction of the axis Y1. The width in the radial direction (the arrow cd direction) of the base portion 20 and the width in the radial direction of the sealing lip portion 21, taken together, are larger than the thickness in the direction of the axis Y1 of the base portion 20. The structure of the gasket 1 will be specifically described below.

The elastic body of the gasket 1 is a rubber material such as fluororubber or acrylic rubber. The reinforcement ring 10 is made of, for example, metal, and is manufactured by press working and forging, and the elastic body portion (the base portion 20 and the seal lip portion 21) is molded by cross-linking (vulcanization) molding using a molding die. In this cross-linking molding, the reinforcing ring 10 is placed in a molding die, and the elastomer portion (the base portion 20 and the seal lip 21) is bonded to the reinforcing ring 10 by cross-linking bonding, whereby the elastomer portion (the base portion 20 and the seal lip 21) and the reinforcing ring 10 are integrally molded.

The outer shape of the gasket 1 is formed in an annular or substantially annular shape around the axis Y1, and an annular or substantially annular opening is formed in the center portion of the gasket 1. As shown in fig. 7 and 8, the gasket 1 includes: a reinforcement ring 10 annular or substantially annular about axis Y1; and an elastic body portion (the base portion 20 and the seal lip portion 21) that is annular or substantially annular about the axis Y1 and is formed of an elastic body that is integrally molded with the reinforcement ring 10.

In the gasket 1, the reinforcement ring 10 is formed in an annular plate shape or a substantially annular plate shape, and extends in parallel or substantially parallel to the radial direction (the arrow cd direction). An annular or substantially annular opening is formed in the center of the reinforcing ring 10. As shown in fig. 7 and 8, the reinforcing ring 10 is formed in a rectangular shape or a substantially rectangular shape in cross section.

As described above, in the mat seal 1, the elastic body portion has the base portion 20 and the seal lip portion 21. The outer shapes of the base 20 and the seal lip 21 are formed in an annular or substantially annular shape around the axis Y1, and an annular or substantially annular opening is formed in the center portion of the base 20 and the seal lip 21. In addition, the seal lip 21 has an annular upper seal lip 22 and an annular lower seal lip 23.

As shown in fig. 7, the base portion 20 is formed in a square shape or a substantially square shape in cross section, and a thickness T1 in the direction of the axis Y1 (the direction of arrow ab) of the base portion 20 is sufficient in thickness as compared with a thickness T2 in the direction of the axis Y1 (the direction of arrow ab) of the reinforcement ring 10. In addition, a width W1 in which the width in the radial direction (arrow cd direction) of the base portion 20 and the width in the radial direction of the seal lip portion are added together is larger than a thickness T1 in the direction of the axis Y1 (arrow ab direction) of the base portion 20.

The reinforcement ring 10 is embedded in a central portion or substantially a central portion in the direction of the axis Y1 (the direction of arrow ab) of the base 20. That is, the thickness T3 of the base portion 20 on the upper side (arrow a direction) of the upper surface 10a, which is the upper surface of the reinforcement ring 10 (arrow a direction), is the same or substantially the same as the thickness T4 of the base portion 20 on the lower side (arrow b direction) of the lower surface 10b, which is the lower surface of the reinforcement ring 10 (arrow b direction).

The end portion on the outer peripheral side (in the direction of arrow d) of the reinforcement ring 10, that is, the outer peripheral end portion, is embedded in the base 20 at a position closer to the outer peripheral side (in the direction of arrow d) than the central portion in the radial direction (in the direction of arrow cd). That is, the outer peripheral surface 10d, which is a surface on the outer peripheral side (in the direction of arrow d) of the reinforcement ring 10, is disposed on the outer peripheral side (in the direction of arrow d) of the central portion in the radial direction (in the direction of arrow cd) of the base 20.

The upper seal lip 22 extends upward (in the arrow a direction) toward the inner peripheral side (in the arrow c direction) from the upper surface 20a, which is the upper surface of the base 20 (in the arrow a direction), and the inner peripheral surface 21c, which is the inner peripheral side (in the arrow c direction) of the seal lip 21. The lower seal lip 23 extends inward (in the direction of arrow c) from the lower surface 20b, which is the lower surface of the base 20 (in the direction of arrow b), and the inner circumferential surface 21c of the seal lip 21 toward the lower side (in the direction of arrow b).

The amount of projection H1 on the upper side (arrow a direction) of the upper seal lip 22 is the same or substantially the same as the amount of projection H2 on the lower side (arrow b direction) of the lower seal lip 23. The amount of projection H3 on the inner peripheral side (in the direction of arrow c) of the upper seal lip 22 is the same or substantially the same as the amount of projection H4 on the inner peripheral side (in the direction of arrow c) of the lower seal lip 23.

An upper surface 22a, which is an upper surface (in the arrow a direction) of the upper seal lip 22, is parallel or substantially parallel to the upper surface 20a of the base 20 in the radial direction (in the arrow cd direction). The inner peripheral surface 22c, which is the surface on the inner peripheral side (in the direction of arrow c) of the upper seal lip 22, is parallel or substantially parallel to the inner peripheral surface 21c of the seal lip 21 in the direction of the axis Y1 (in the direction of arrow ab).

A lower surface 23b which is a lower surface (in the direction of arrow b) of the lower seal lip 23 is parallel or substantially parallel to the lower surface 20b of the base 20 in the radial direction (in the direction of arrow cd). The inner peripheral surface 23c, which is the surface on the inner peripheral side (in the direction of arrow c) of the lower seal lip 23, is parallel or substantially parallel to the inner peripheral surface 21c of the seal lip 21 in the direction of the axis Y1 (in the direction of arrow ab). The front end portion 22t of the upper side seal lip 22 and the front end portion 23t of the lower side seal lip 23 have rounded corners, respectively.

The width W2 in the radial direction (arrow cd direction) of the reinforcing ring 10 is substantially the same as the width W3 in the radial direction (arrow cd direction) of the upper and lower seal lips 22 and 23. That is, a distance from the inner peripheral surface 10c, which is the inner peripheral surface of the reinforcement ring 10, to the inner peripheral surface 21c of the seal lip is sufficiently longer than a distance from the outer peripheral surface 10d of the reinforcement ring 10 to the outer peripheral surface 20d, which is the outer peripheral surface (in the direction of arrow d) of the base 20.

In the base portion 20, reinforcing ring pressing holes 24a and 24b for disposing the reinforcing ring 10 at a substantially central portion in the direction of the axis Y1 (the direction of arrow ab) of the base portion 20 are formed at the upper end and the lower end of the base portion 20. Specifically, a plurality of (for example, four (fig. 1)) reinforcement ring pressing holes 24a are formed on the upper surface 20a of the base 20 so as to be concentric or substantially concentric with the center or substantially the center of the base 20 and so as to be equally angularly spaced or substantially equally angularly spaced. The reinforcement ring pressing hole 24a is formed to a predetermined depth from the upper surface 20a of the base 20 toward the lower side (arrow b direction).

Further, a plurality of (for example, four) reinforcement ring pressing holes 24b are formed in the lower surface 20b of the base 20 so as to be concentric or substantially concentric with the center or substantially the center of the base 20 and so as to be equally angularly spaced or substantially equally angularly spaced. The reinforcement ring pressing hole 24b is formed to a predetermined depth from the lower surface 20b of the base 20 toward the upper side (arrow a direction). The reinforcement ring pressing hole 24b is formed at the same or substantially the same position as the reinforcement ring pressing hole 24a in the direction of the axis Y1 (the direction of arrow ab).

For example, when a long and narrow bar-shaped reinforcing ring pressing portion (not shown) is inserted into each of the reinforcing ring pressing holes 24a and 24b at the time of manufacture, the reinforcing ring 10 can be pressed from the upper side (arrow a direction) and the lower side (arrow b direction), and the reinforcing ring 10 can be disposed at a substantially central portion in the direction of the axis Y1 (arrow ab direction) of the base portion 20.

The base portion 20 has an outer peripheral lip portion 25 protruding from the outer peripheral portion of the base portion 20 toward the outer peripheral side (direction of arrow d) at a substantially central portion of the base portion 20 in the direction of the axis Y1 (direction of arrow ab). Specifically, a plurality of (for example, four (fig. 1)) outer circumferential lips 25 extend from the outer circumferential surface 20d of the base 20 in a direction (outer circumferential side (arrow d direction)) away from the center or substantially the center of the base 20 in a concentric or substantially concentric manner at equal angular intervals or substantially equal angular intervals.

The outer peripheral lips 25 are formed at a central portion or substantially a central portion in the direction of the axis Y1 (the direction of arrow ab) of the outer peripheral surface 20d of the base 20, respectively. As shown in fig. 1, the outer peripheral lip portions 25 are formed at the same or substantially the same positions as the corresponding reinforcement ring pressing holes 24a, 24b in the radial direction (the direction of arrow cd). The outer peripheral lips 25 each have a predetermined width in the circumferential direction of the base 20, and have the same or substantially the same width in the circumferential direction of the base 20.

As shown in fig. 6 and 8, a plurality of (e.g., four (fig. 6)) groove portions 26 are formed on the outer peripheral surface 20d of the base portion 20 so as to be concentric or substantially concentric with the center or substantially the center of the base portion 20 and so as to be equally or substantially equally spaced. The groove 26 extends from the lower surface 20b of the base 20 toward the upper surface 20a and parallel or substantially parallel to the direction of the axis Y1 (the direction of arrow ab) to a position that does not reach the upper surface 20a of the base 20 in the direction of the axis Y1 (the direction of arrow ab).

The groove 26 has an inner circumferential surface 26c which is a surface on the inner circumferential side (in the direction of arrow c) of the groove 26. The inner peripheral surface 26c of the groove 26 is a rectangular or substantially rectangular curved surface that protrudes toward the outer peripheral side (in the direction of arrow d), and the outer peripheral surface 10d of the reinforcement ring 10 is exposed. The inner peripheral surface 26c of the groove 26 is flush with the outer peripheral surface 10d of the reinforcement ring 10.

The groove 26 has a side surface 26a which is a circumferential surface of the groove 26. The side surfaces 26a of the groove 26 are rectangular or substantially rectangular curved surfaces that are convex toward the outer peripheral side (in the direction of arrow d) and smoothly connect the outer peripheral surface 20d of the base 20 and the inner peripheral surface 26c of the groove 26. The groove portions 26 are formed at positions shifted by 45 degrees in the circumferential direction from the corresponding reinforcing ring pressing holes 24a, 24b and outer peripheral lip portion 25 in the radial direction (the direction of arrow cd).

Next, an assembled state when the gasket 1 is assembled will be described. Fig. 9 is a cross-sectional view showing a state in which the gasket 1 according to the embodiment of the present invention is assembled between the upper member 110 and the lower member 120 of the object 100 to be sealed. The object 100 to be sealed has an upper member 110 as a member on the upper side (arrow a direction) and a lower member 120 as a member on the lower side (arrow b direction) of the object 100 to be sealed.

The upper member 110 is disposed above the gasket 1 (in the direction of arrow a), and has a through hole 110 p. The diameter of the through hole 110p is smaller than the diameter of the opening of the gasket 1. The through hole 110p of the upper member 110 and the opening of the gasket 1 are coaxial or substantially coaxial with the axis Y1.

The lower member 120 is disposed below the gasket 1 (in the direction of arrow b), and has a through hole 120 p. The diameter of the through hole 120p is smaller than the diameter of the opening of the gasket 1. The through hole 120p of the lower member 120 and the opening of the gasket 1 are coaxial or substantially coaxial with the axis Y1.

The diameter of the through-hole 120p of the lower member 120 is the same as or substantially the same as the diameter of the through-hole 110p of the upper member 110. The through hole 120p of the lower member 120 and the through hole 110p of the upper member 110 are coaxial or substantially coaxial with the axis Y1, thereby forming the flow path f.

The lower member 120 has a housing portion 121 for housing the gasket 1. The receiving portion 121 is recessed downward (in the direction of arrow b) from an upper surface 120a, which is an upper surface (in the direction of arrow a) of the lower member 120.

As shown in fig. 9, when the gasket 1 is accommodated in the accommodating portion 121 of the lower member 120, the upper member 110 is disposed on the upper side (arrow a direction) of the gasket 1, and the lower member 120 and the upper member 110 are fastened by a bolt or the like (not shown), the gasket 1 is pressed by the upper member 110, and the upper seal lip 22 and the lower seal lip 23 receive a compressive force in the axial direction (arrow ab direction).

Thereafter, the upper seal lip 22 and the lower seal lip 23 are deformed to be inclined toward the inner peripheral side (arrow c direction). The front end portions 22t, 23t of the upper seal lip 22 and the lower seal lip 23 have rounded corners, and therefore, they are liable to fall toward the inner peripheral side (in the direction of arrow c).

Thereafter, when the upper surface 20a of the base 20 abuts or approaches the lower surface 110b, which is a lower surface (in the arrow b direction) of the upper member 110, the inclination of the upper seal lip 22 to the inner peripheral side (in the arrow c direction) is eliminated. Further, when the lower surface 20b of the base 20 abuts against or approaches the lower surface 121b, which is a surface on the lower side (in the arrow b direction) of the housing portion 121 of the lower member 120, the inclination of the lower seal lip 23 to the inner peripheral side (in the arrow c direction) is eliminated.

Thereafter, when fastening of the lower member 120 and the upper member 110 by bolts or the like (not shown) is completed, the upper sealing lip 22 is brought into close contact with the lower surface 110b of the upper member 110, and the lower sealing lip 23 is brought into close contact with the lower surface 121b of the accommodating portion 121 of the lower member 120, thereby sealing the gap C between the upper member 110 and the lower member 120 of the object 100.

Note that the distance from the axis Y1 of the gasket 1 to the outer peripheral side end portion, which is the end portion on the outer peripheral side (in the direction of arrow d) of the outer peripheral lip 25 of the base 20, is slightly larger than the distance from the axis Y1 of the gasket 1 to the outer peripheral surface 121d, which is the surface on the outer peripheral side (in the direction of arrow d) in the housing portion 121 of the lower member 120. Therefore, the outer peripheral lip 25 is in close contact with the outer peripheral surface 121d of the accommodating portion 121 of the lower member 120 in a state where the gasket 1 is accommodated in the accommodating portion 121 of the lower member 120.

As described above, with the gasket 1 according to the embodiment of the invention, the upper seal lip portion 22 extends toward the inner peripheral side (arrow c direction) toward the upper side (arrow a direction) in the direction of the axis Y1 (arrow ab direction) at the upper end portion of the base portion 20, and the lower seal lip portion 23 extends toward the inner peripheral side (arrow c direction) toward the lower side (arrow b direction) in the direction of the axis Y1 (arrow ab direction) at the lower end portion of the base portion 20.

Further, the thickness T1 in the direction of the axis Y1 (the direction of the arrow ab) of the base portion 20 is set to be sufficiently larger than the thickness T2 in the direction of the axis Y1 (the direction of the arrow ab) of the reinforcement ring 10. In addition, a width W1 that sums up the width in the radial direction (the arrow cd direction) of the base portion 20 and the width in the radial direction of the seal lip is larger than a thickness T1 in the direction of the axis Y1 (the arrow ab direction) of the base portion 20.

Therefore, by securing the thickness T1 in the direction of the axis Y1 (the direction of the arrow ab) of the base portion 20 in the gasket 1, even when the variation in the compression width of the gasket 1 is increased due to a large tolerance in the depth of the housing 121 of the gasket 1 between the upper member 110 and the lower member 120 of the object 100 to be sealed, the variation in the compression width of the gasket 1 can be alleviated by the thickness T1 in the direction of the axis Y1 (the direction of the arrow ab) of the base portion 20. As a result, the gasket 1 according to the embodiment of the present invention can further improve the durability of the gasket 1 even when compressed excessively, and can sufficiently exhibit the sealing performance of the gasket 1 even when compressed insufficiently.

Further, the width W1 in which the width in the radial direction (the arrow cd direction) of the base portion 20 and the width in the radial direction of the seal lip portion are added together is larger than the thickness T1 in the axis Y1 direction (the arrow ab direction) of the base portion 20, whereby the posture change of the gasket 1 due to compression can be suppressed, and the gasket 1 can exert sufficient sealing performance.

In the gasket 1, the width W2 in the radial direction (direction of arrow cd) of the reinforcement ring 10 is substantially the same as the width W3 in the radial direction (direction of arrow cd) of the upper seal lip 22 and the lower seal lip 23. Therefore, the distance from the inner peripheral surface 10c of the reinforcement ring 10 to the upper side seal lip 22 and the lower side seal lip 23 is sufficiently ensured. Therefore, even when an inexpensive reinforcing ring 10 is used without subjecting the reinforcing ring 10 to barrel polishing or the like, it is possible to prevent the gasket 1 from being damaged from the edge of the reinforcing ring 10 due to the posture change of the gasket 1 caused by compression, and to further improve the durability of the gasket 1.

In the gasket 1, the reinforcement ring 10 is embedded in a central portion or a substantially central portion in the thickness direction (the direction of the axis Y1 (the direction of the arrow ab)) of the base 20. Therefore, the thickness T3 of the base portion 20 on the upper side (arrow a direction) of the upper surface 10a of the reinforcement ring 10 and the thickness T4 of the base portion 20 on the lower side (arrow b direction) of the lower surface 10b of the reinforcement ring 10 are the same or substantially the same thickness, so that rigidity can be secured uniformly in the axis Y1 direction (arrow ab direction), and a change in the posture of the gasket 1 due to compression can be suppressed, and the gasket 1 can exhibit sufficient sealing performance.

In the gasket 1, the base portion 20 has an outer peripheral lip portion 25 protruding from the outer peripheral portion of the base portion 20 toward the outer peripheral side (direction of arrow d) at a substantially central portion of the base portion 20 in the direction of the axis Y1 (direction of arrow ab). Further, the distance from the axis Y1 of the gasket 1 to the outer peripheral side end portion of the base 20 is slightly larger than the distance from the axis Y1 of the gasket 1 to the outer peripheral surface 121d of the housing portion 121 of the lower member 120. Therefore, the falling-off during the assembling can be suppressed, and the assembling workability can be improved. Further, even when the gasket 1 receives a high fluid pressure from the fluid flowing through the flow path f, displacement of the gasket 1 in the width direction (the direction of the arrow cd) can be suppressed.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but includes all embodiments included in the concept of the present invention and claims. In order to achieve at least a part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. In addition, for example, the shape, material, arrangement, size, and the like of each component in the above-described embodiments may be appropriately changed according to a specific use mode of the present invention.

For example, the gasket 1 according to the embodiment of the present invention has been described by exemplifying the case where the reinforcing ring 10 is embedded in the central portion or substantially the central portion in the direction of the axis Y1 (the direction of the arrow ab) of the base 20. However, the present invention is not limited to this, and the reinforcement ring 10 may be embedded at a position above (arrow a direction) or below (arrow b direction) the center portion in the direction of the axis Y1 (arrow ab direction) of the base 20.

The gasket 1 according to the embodiment of the present invention is described by way of example of the case where the outer peripheral end portion of the reinforcement ring 10 is embedded on the outer peripheral side (in the direction of arrow d) of the central portion in the radial direction (in the direction of arrow cd) of the base portion 20. However, the present invention is not limited to this, and the outer peripheral end portion of the reinforcing ring 10 may be embedded near the central portion of the base 20 in the radial direction (the direction of arrow cd) or at a position closer to the inner peripheral side (the direction of arrow c) than the central portion.

The gasket 1 according to the embodiment of the present invention has been described by way of example in the case where the base portion 20 has the outer peripheral lip portion 25 protruding from the outer peripheral portion of the base portion 20 toward the outer peripheral side (in the direction of arrow d) at the substantially central portion of the base portion 20 in the direction of the axis Y1 (in the direction of arrow ab). However, the present invention is not limited to this, and the outer peripheral lip portion 25 may be formed at any position on the upper side (arrow a direction) or the lower side (arrow b direction) of the central portion in the direction of the axis Y1 (arrow ab direction) of the base portion 20, may have one or a plurality of outer peripheral lip portions 25 other than four, or may not have the outer peripheral lip portion 25.

The gasket 1 according to the embodiment of the present invention has been described by way of example of a case where a plurality of (for example, four) groove portions 26 are formed on the outer peripheral surface 20d of the base portion 20 at equal angular intervals or at substantially equal angular intervals, in a concentric circle or substantially concentric circle shape from the center or substantially the center of the base portion 20. However, the present invention is not limited to this, and the groove 26 may be formed at any position of the outer peripheral surface 20d of the base 20, and one or a plurality of grooves 26 other than four grooves may be provided, or the groove 26 may not be provided.

Description of the reference numerals

1 … gasket, 10 … reinforcing ring, 10a … upper surface, 10b … lower surface, 10C … inner peripheral surface, 10d … outer peripheral surface, 20 … base, 20a … upper surface, 20b … lower surface, 20d … outer peripheral surface, 21 … sealing lip, 21C … inner peripheral surface, 22 … upper sealing lip, 22a … upper surface, 22C … inner peripheral surface, 22T … front end portion, 23 … lower sealing lip, 23b … lower surface, 23C … inner peripheral surface, 23T … front end portion, 24a, 24b … reinforcing ring pressing hole, front end portion, 25 a 25 … outer peripheral lip, 26 …, 26a … side surface, 26C … inner peripheral surface, 100 … object, 110b … upper member, 110b … lower surface, 110p … penetration hole, 120 … lower member, 120a … upper surface, 121 a … receiving portion, 121b … lower surface, … d …, 121C … d … f, … f gap …, T …, … thickness, H1-H4 … projection, W1-W3 … width, Y1 … axis