JP2017096320A - gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient sealability for a clearance between two members.SOLUTION: A gasket 1 mounted between one member 10 and another member 20 arranged oppositely to each other, includes a body part 2 arranged in a groove part 10h of the one member 10 in mounting the gasket 1; a one-side lip 3 formed integrally with a base end part 2a, which extends obliquely in a state where the body part 2 is arranged in the groove part 10h so as to contact with a bottom surface 10b from an end part on a bottom surface side of the base end part 2a, wherein the base end part expands between the bottom surface 10b of the groove 10h and the other member 20 with intervals therefrom; and an other-side lip 4 formed integrally with the base end part 2a, which extends obliquely so as to contact with the other member 20 from an end part on the other member side of the base end part 2a; and core materials 5, 31 integrally formed at a position held between the one-side lip 3 and the other-side lip 4 in the base end part 2a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gasket, and more particularly, to a gasket that seals a gap between one member and the other member.

  Conventionally, an O-ring, a square ring, or the like is generally used as a gasket. For example, a gasket is attached to an annular groove formed in one member of one member and the other member that are arranged to face each other, thereby sealing a gap between the two members.

  In recent years, in gaskets, in order to reduce the weight of members, there has been a change in which the material is changed from iron to aluminum and then from aluminum to resin. However, resin generally has lower processing accuracy than metal cutting processing accuracy, and creep due to heat and stress also increases, so there is a tendency that the followability of the gasket is greatly required for the surface of the resin member. .

  In view of this, a gasket for securing a sealing property between two members made of resin (see, for example, Patent Document 1) has been proposed by the present applicant. This gasket seals between two members, and has an annular seal portion formed by gradually reducing the thickness from the central portion toward both end surfaces, and is provided on one circumferential surface of the seal portion. It has the structure which formed the cyclic | annular recessed part in the center part. As a result, when the gasket is mounted in the groove of one member, the central portion of the seal portion can be bent, and the gap between the two members can be sealed.

Japanese Utility Model Publication No. 6-18762

  However, even in the gasket of Patent Document 1, when a large error occurs in the dimensional accuracy in the depth direction of the annular groove formed in one member due to the so-called sink of the resin at the time of molding, When the distance between the opposing surfaces of the bottom surface of the groove formed in the member and the surface of the other member, that is, the gap between the two members becomes larger than expected, there is a problem that sufficient sealing performance cannot be secured. It was.

  On the other hand, when the gap between the two members becomes smaller than expected, there is a problem that the central portion of the gasket is excessively bent and cracks occur, and in this case, sufficient sealing performance cannot be ensured.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a gasket capable of ensuring a sufficient sealing performance against a gap between two members.

  In order to achieve the above object, the present invention provides a gasket that is mounted between one member and the other member that are arranged to face each other, and is provided in a groove portion of the one member when the gasket is mounted. From the end portion on the bottom surface side of the base end portion that is widened with a gap between the bottom surface of the groove portion and the other member in the state where the main body portion is disposed in the groove portion and the main body portion One side lip formed integrally with the base end extending obliquely so as to contact the bottom surface, and the other member side end of the base end so as to contact the other member The base end portion is integrally formed with the base end portion at a position sandwiched between the one side lip and the other side lip at the base end portion. And a core material.

  In the gasket according to the present invention, the core material may be a metal or a resin.

  In the gasket according to the present invention, the cross-sectional shape of the one-side lip and the cross-sectional shape of the other-side lip may be symmetrical with respect to the center line of the main body.

  According to the gasket according to the present invention, it is possible to ensure a sufficient sealing performance against the gap between the two members.

It is a top view which shows the whole schematic structure of the gasket which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the AA cross section in FIG. 1 of the gasket which concerns on the 1st Embodiment of this invention. It is sectional drawing with which it uses for description of the mounting state of the gasket which concerns on the 1st Embodiment of this invention. It is sectional drawing with which it uses for description of the mounting structure of the cross-section of a gasket and the gasket which concerns on the 2nd Embodiment of this invention. It is a top view which shows the whole schematic structure of the gasket which concerns on the 3rd Embodiment of this invention. It is a top view which shows the whole schematic structure of the gasket which concerns on the 4th Embodiment of this invention.

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

<First Embodiment>
FIG. 1 is a plan view showing an overall schematic configuration of a gasket 1 according to the first embodiment of the present invention, and FIG. 2 is a view of the gasket 1 according to the first embodiment of the present invention shown in FIG. FIG. 3 is a cross-sectional view showing a structure of a -A cross section, and FIG. 3 is a cross-sectional view for explaining a mounting state of the gasket 1 according to the first embodiment of the present invention.

  Hereinafter, for convenience of explanation, the outer side is the ring outer side of the ring-shaped gasket 1, that is, the direction of the arrow a in FIGS. The inner side is the ring inner side of the gasket 1, that is, the direction of the arrow b. In other words, the outer side is the side of one member 10 that is disposed outwardly of the two members, and the inner side is the side of the other member 20 that is disposed inwardly of the two members.

  Further, the sealing target side is defined as a vertically upward direction, that is, an arrow c direction in a cross section taken along an arrow AA line orthogonal to an extending direction e in which the gasket 1 extends in a ring shape. Similarly, the non-sealing target side is defined as a vertically downward direction, that is, an arrow d direction in a cross section taken along an arrow AA line orthogonal to an extending direction e in which the gasket 1 extends in a ring shape.

  Here, a space formed by one member 10, the other member 20, and the gasket 1, and a space on the sealing target side (arrow C direction) from the gasket 1 is defined as a “sealing target space”. A space on the non-sealing target side (arrow D direction) from the gasket 1 is defined as a “non-sealing target space”.

  As shown in FIG. 1 to FIG. 3, the gasket 1 is a member formed in an annular shape as a whole, and one member 10 and the other member 20 of two members arranged to face each other with a predetermined interval. It is to be mounted between.

  That is, the gasket 1 is mounted between the one member 10 and the other member 20, and the surface of the one member 10 facing the other member 20 (hereinafter also referred to as "opposing surface"). ) 10a and a member that seals a gap between the surface of the other member 20 facing the one member 10 (hereinafter also referred to as “opposing surface”) 20a.

  One member 10 and the other member 20 are two fixing members in which resin is used as the material. For example, one member 10 is an annular lid-like member such as a housing or casing disposed on the outside (in the direction of arrow a), and the other member 20 is used as a pair with one member 10, It is a columnar member arranged in the (arrow b direction). However, one member 10 may be a columnar member arranged on the inner side (arrow b direction), and the other member 20 may be a lid-like member arranged on the outer side (arrow a direction). Examples of the resin material include nylon 6, 6 (PA66), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and the like.

  An annular groove 10 h for mounting the gasket 1 is formed on the facing surface 10 a of one member 10. The groove 10 h may be formed on the facing surface 20 a of the other member 20 instead of being formed on the facing surface 10 a of one member 10. The depth dep from the facing surface 10a to the bottom surface 10b in the groove 10h is formed smaller than the horizontal width w indicated by the arrow ab direction of the gasket 1. Further, the height h1 in the vertical direction indicated by the arrow cd direction in the groove portion 10h is formed larger than the height h2 in the vertical direction of the gasket 1.

  The gasket 1 includes a main body 2 made of an annular elastic body centered on the axis X, and a reinforcing ring 5 made of an annular metal material centered on the axis X formed integrally with the main body 2. Yes. The main body 2 is integrally formed with the reinforcing ring 5 by crosslinking (vulcanization) molding using a molding die.

  Examples of the elastic body of the main body 2 include various rubber-like elastic members. Examples of rubber-like elastic members include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), fluorine rubber (FKM), silicon rubber, and styrene butadiene rubber (SBR). Is used.

  The main body 2 has an inverted T-shaped cross section, and includes a base end 2a along the arrow ab direction and a support column 2b along the arrow cd direction. The base end portion 2a is a portion that is disposed in the groove portion 10h of the one member 10 when the gasket 1 is mounted, and is spaced from the bottom surface 10b of the groove portion 10h and the opposing surface 20a of the other member 20 respectively. It spreads in the direction of arrow ab. The column portion 2b is a fundamental portion of the gasket 1, and is integrally formed with the base end portion 2a in a state of protruding from the center of the base end portion 2a toward the sealing target side (arrow c direction).

  The base end 2a is divided into an outer side (in the direction of arrow a) and an inner side (in the direction of arrow b) and is integrally formed so as to face each other, and an inner side as the other side lip. A side lip 4 is provided.

  The outer side lip 3 is a portion extending obliquely from the end of the base portion 2a on the bottom surface 10b side of the groove portion 10h so as to contact the bottom surface 10b, and the front end portion 3a is slightly outside the base portion. It inclines so that it may space apart from the support | pillar part 2b toward (arrow a direction), and is extended to the sealing object side (arrow c direction). For example, as shown in FIG. 2, the distal end portion 3 a of the outer side lip 3 has a wedge-shaped cross-sectional shape that protrudes outward (in the direction of arrow a). That is, the outer side lip 3 has a predetermined tightening margin with the distal end portion 3a on the bottom surface 10b of the groove portion 10h in a state where the base end portion 2a of the main body portion 2 is placed in the groove portion 10h of the one member 10. It is formed so as to abut.

  The inner side lip 4 is a portion extending obliquely from the end of the other member 20 on the facing surface 20a side in the base end portion 2a so as to come into contact with the facing surface 20a. Also, it slightly inclines toward the inside (arrow b direction) so as to be separated from the column 2b and extends toward the sealing target side (arrow c direction). For example, as shown in FIG. 2, the front end 4a of the inner side lip 4 also has a wedge-shaped cross-sectional shape that protrudes inward (in the direction of the arrow ba). That is, the inner side lip 4 has a predetermined tightening margin and the distal end portion 4a is the opposite surface of the other member 20 in a state where the base end portion 2a of the main body portion 2 is placed in the groove portion 10h of the one member 10. It is formed so as to be in contact with 20a.

  Thus, the outer side lip 3 and the inner side lip 4 are formed symmetrically about the center line (not shown) of the support column 2b of the main body 2 as an axis. In this case, the shape of the outer side lip 3 in contact with the bottom surface 10b of the groove 10h of one member 10 and the shape of the inner side lip 4 in contact with the opposing surface 20a of the other member 20 are the same. Therefore, an external force corresponding to the gap is evenly applied to the outer side lip 3 and the inner side lip 4.

  The reinforcing ring 5 is an annular member arranged to reinforce the main body 2 and is formed integrally with the main body 2 so as to straddle both the base end 2a and the support column 2b. The reinforcing ring 5 is formed of, for example, a thin plate metal material and has an L-shaped cross section. Examples of the metal material of the reinforcing ring 5 include an aluminum alloy, stainless steel, and SPCC (cold rolled steel).

  The reinforcing ring 5 is bent from the end of the disk-shaped disk part 5a corresponding to the bottom of the L-shaped section in the direction of the arrow ab and the outer side of the disk part 5a (in the direction of the arrow a). It consists of a cylindrical part 5b extending in the direction of arrow c.

  The disk portion 5a of the reinforcing ring 5 has an inner end (in the direction of arrow b) extending to the vicinity of the inner side lip 4 in the base end portion 2a, and supports the inner side lip 4 from the base end portion 2a side. Yes.

  The cylindrical portion 5b of the reinforcing ring 5 is integrally formed in a state where it is embedded in the column portion 2b provided at a position sandwiched between the outer side lip 3 and the inner side lip 4 at the base end portion 2a. And is used as a core material of the support column 2b. That is, the cylindrical portion 5b of the reinforcing ring 5 suppresses the bending (falling) of the column portion 2b in the direction of arrow a or arrow b. Thereby, the column part 2b of the main body part 2 is formed so as to maintain its position and shape even if the outer side lip 3 and the inner side lip 4 are bent due to the presence of the cylindrical part 5b of the reinforcing ring 5. ing.

  The reinforcing ring 5 is manufactured to have an L-shaped cross section, for example, by bending with a press. The reinforcing ring 5 is placed in a mold when the main body 2 is molded by cross-linking (vulcanization) molding, and the main body 2 is bonded to the reinforcing ring 5 by cross-linking adhesion. And the reinforcing ring 5 are integrally formed.

  In the above configuration, when the gasket 1 is mounted in the groove portion 10h of one member 10, the gasket 1 is mounted between the facing surface 10a of the one member 10 and the facing surface 20a of the other member 20. Will be.

  At this time, a large error has occurred in the dimensional accuracy of the depth dep of the groove 10 h in one member 10, and the distance between the opposing surfaces of the bottom surface 10 b of the groove 10 h and the opposing surface 20 a in the other member 20 is the gasket 1. May be shorter than the width w. Even in such a case, the outer side lip 3 and the inner side lip 4 of the gasket 1 attached to the groove 10h are bent so as to face each other, so that the gap between one member 10 and the other member 20 is reduced. The gap can be sealed.

  In particular, both the outer side lip 3 and the inner side lip 4 that protrude outward and inward from the outer (arrow a direction) and inner (arrow b direction) end portions of the base end portion 2a of the main body portion 2 face each other. By bending in such a manner, an error in the dimensional accuracy of the depth dep of the groove 10 h can be absorbed by the bending of both the outer side lip 3 and the inner side lip 4. Thus, the gasket 1 can absorb a large amount of error in the dimensional accuracy of the depth dep of the groove 10h and ensure sufficient sealing performance as compared with the case where the gasket 1 is sealed only by the inner side lip 4.

  In addition, there is a large error in the dimensional accuracy of the depth dep of the groove 10h in one member 10, and the distance between the opposed surfaces of the bottom surface 10b of the groove 10h and the opposed surface 20a of the other member 20 is increased. There is. Even in such a case, the action of the pressure P causes the outer side lip 3 and the inner side lip 4 of the gasket 1 to be further pressed outward (in the direction of arrow a) and inward (in the direction of arrow b). The surface pressure against the opposing surface 20a of the bottom surface 10b and the other member 20 can be maintained, and sufficient sealing performance can be ensured.

  Further, in the gasket 1, the cylindrical portion 5 b of the reinforcing ring 5 is integrally formed with the column portion 2 b of the main body portion 2, so that the fluid pressure P in the sealed space is applied to the inner side lip 4. However, the cylindrical portion 5b of the reinforcing ring 5 can suppress the column portion 2b of the main body portion 2 from being bent (fallen) outward (in the direction of arrow a) by the pressure P. Thereby, since the gasket 1 can maintain the contact state of the inner side lip 4 and the opposing surface 20a of the other member 20, a sufficient sealing performance can be ensured.

  Further, in the gasket 1, the cylindrical portion 5b of the reinforcing ring 5 is integrally formed with the column portion 2b of the main body portion 2, so that the column portion 2b is changed to the arrow a by the influence of the bending of the outer side lip 3 and the inner side lip 4. Bending (falling) in the direction or the direction of the arrow b can be suppressed. Thereby, even if there is a place where the distance between the opposing surfaces of the bottom surface 10b of the groove 10h and the opposing surface 20a of the other member 20 is short or a place where the distance between the opposing surfaces is long, Position and state are maintained. Thus, sufficient sealing performance can be ensured without any deviation in sealing performance with respect to the one member 10 and the other member 20 at each portion in the extending direction e of the gasket 1 over the entire circumference in the circumferential direction.

  According to the above configuration, the one member 10 and the other member 10 are bent by utilizing the bending of both the outer side lip 3 and the inner side lip 4 provided with the cylindrical portion 5b that is the core material of the main body 2 interposed therebetween. Since the gap between the other member 20 can be sealed, the one-side lip can be used even when the error in the gap between one member 10 and the other member 20 is large or small due to sink marks or the like during molding. Both the 10 and the other lip 20 can absorb gap errors and ensure sufficient sealing performance.

  Further, since the gasket 1 can prevent the column portion 2b from bending when it receives the fluid pressure P due to the presence of the cylindrical portion 5b as the core material, the gasket 1 is brought into contact with the bottom surface 10b of the groove portion 10h. The surface pressure state of the outer side lip 3 and the surface pressure state of the inner side lip 4 in contact with the opposing surface 20a of the other member 20 can be maintained, and thus sufficient sealing performance is ensured. Can do.

  Thus, the gasket 1 can ensure sufficient sealing performance against the gap between the one member 10 and the other member 20.

<Second Embodiment>
Next, the gasket which concerns on the 2nd Embodiment of this invention is demonstrated. FIG. 4 is a cross-sectional view for explaining the cross-sectional structure of the gasket and the mounting state of the gasket according to the second embodiment of the present invention. In the second embodiment, one member 10, the other member 20, the main body 2, the outer side lip 3, the inner side lip 4 in the first embodiment shown in FIGS. The same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The gasket 30 in the second embodiment is greatly different in that a reinforcing ring 31 is used instead of the reinforcing ring 5 in the first embodiment, and only the difference will be described. Similar to the reinforcing ring 5 in the first embodiment, the reinforcing ring 31 is an annular member used to reinforce the main body 2 and extends over both the base end 2a and the column 2b. Are formed integrally with the main body 2.

  The reinforcing ring 31 is formed of a thin plate-like metal material, and as the metal material, there are aluminum alloy, stainless steel, and SPCC (cold rolled steel) as in the case of the reinforcing ring 5.

  The reinforcing ring 31 is a cylindrical cylindrical member having a rectangular cross section in the figure, and is integrally formed in a state of being embedded substantially at the center of the support column 2b, and is used as a core material of the support column 2b. That is, also in the reinforcing ring 31, similarly to the cylindrical portion 5 b of the reinforcing ring 5, bending (falling) of the column portion 2 b in the arrow a direction or the arrow b direction is suppressed. Thereby, the support | pillar part 2b of the main-body part 2 is formed so that the position and shape may be maintained even if bending occurs in the outer side lip 3 and the inner side lip 4 due to the presence of the reinforcing ring 31.

  The reinforcing ring 31 is placed in a mold when the main body 2 is molded by cross-linking (vulcanization) molding, and the main body 2 is bonded to the reinforcing ring 31 by cross-linking adhesion. And the reinforcing ring 31 are integrally formed.

  Also in the gasket 30 having such a configuration, the same operational effects as those of the first embodiment can be obtained, and sufficient sealing performance is ensured with respect to the gap between the one member 10 and the other member 20. can do.

<Third Embodiment>
FIG. 5 is a plan view showing the overall schematic configuration of the gasket according to the third embodiment of the present invention. In the gasket according to the third embodiment of the present invention, it is possible to form a square tube-shaped gasket 40 in accordance with the shape of one member and the other member instead of the ring-shaped gaskets 1 and 30. .

  Also in this case, the cross-sectional structure of the A-A cross section is similar to the gasket 1 of the first embodiment and the gasket 30 of the second embodiment, and the reinforcing ring 5 and the reinforcing ring 31 are provided on the main body 2 of the gasket 40. Can be integrally molded, and the same effects as those of the first embodiment can be obtained.

<Fourth embodiment>
FIG. 6 is a plan view showing an overall schematic configuration of the gasket according to the forty-third embodiment of the present invention. In the gasket according to the fourth embodiment of the present invention, not the ring-shaped gasket 1 or the rectangular gasket 40, but the linear gasket 50 according to the shape of one member and the other member. It is possible.

  Also in this case, the cross-sectional structure of the A-A cross section is similar to the gasket 1 of the first embodiment and the gasket 30 of the second embodiment. Can be integrally molded, and the same effects as those of the first embodiment can be obtained.

<Other embodiments>
In the first to fourth embodiments described above, the case where a metal material is used as the material of the reinforcing rings 5 and 31 has been described. However, the present invention is not limited to this, and the reinforcement made of a resin material is used. A ring may be used. Even in this case, the same effects as those of the first to fourth embodiments can be obtained. As the resin material, for example, nylon 6, 6 (PA66), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), or the like can be used.

  Further, in the first to fourth embodiments described above, the case where the gaskets 1, 40, 50 are formed in an annular shape, a rectangular tube shape, and a straight shape has been described. However, the present invention is not limited to this, and any other various shapes such as an elliptical shape may be used. However, the cross-sectional shapes may be the same.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the gaskets 1, 30, 40, 50 according to the above-described embodiments, and the concept of the present invention and the scope of the claims. Including all embodiments. In addition, the respective configurations may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects. For example, the shape, material, arrangement, size, and the like of each component in the above embodiment can be changed as appropriate according to the specific usage mode of the present invention.

  The gasket of the present invention can be used in various fields for sealing a gap between one member and the other member in a vehicle such as an automobile and its accessories, general industrial machinery, construction machinery, and the like. .

1, 30, 40, 50 Gasket 2 Main body 2a Base end 2b Strut 3 Outer side lip (one side lip)
4 Inner side lip (the other lip)
5, 31 Reinforcement ring (core material)
5a Disk part 5b Cylindrical part (core material)
10 One member 10a, 20a Opposing surface 10b Bottom surface 10h Groove 20 Other member x Axis line

Claims (3)

A gasket that is mounted between one member and the other member arranged to face each other,
A main body disposed in the groove of the one member when the gasket is mounted;
In a state where the main body portion is disposed in the groove portion, the bottom surface of the base end portion that is widened with a space between the bottom surface of the groove portion and the other member is brought into contact with the bottom surface. The base end extending obliquely so as to be in contact with the other member from the one end of the base end portion on the other member side of the base end portion The other side lip formed integrally with the part;
A core material integrally formed with the base end portion at a position sandwiched between the one side lip and the other side lip at the base end portion;
A gasket comprising: The gasket according to claim 1, wherein the core material is a metal or a resin. 3. The gasket according to claim 1, wherein the cross-sectional shape of the one-side lip and the cross-sectional shape of the other-side lip are line-symmetric with respect to the center line of the main body portion.