JP2000028003A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which reduces the number of seal parts, expands dimensional accuracy and assembling accuracy of counterparts for mounting, thereby is advantageous in cost and is capable of realizing space saving in seal space. SOLUTION: This gasket is provided with a cylindrical reinforcing member 1 fitted into the inside of a first case member 51, one end side seal part 3 which is held by the reinforcing member 1, projects in the axial direction from the reinforcing member 1 and is very close to a second case member 52 and an other end side seal part 6 which is held by the reinforcing member 1, projects in the axial direction from the reinforcing member 1 and is very close to a third case member 53. The axial direction length of the one end side seal part 3 is set to a size which is more than twice as much as dimensional dispersion between the second and third members 52, 53, the axial direction length of the other end side seal part 6 is set to a length smaller than the axial direction length of the one end side seal part 3, and the other end side seal part 6 is arranged in the inside of the reinforcing member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket which is a kind of a sealing device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a pair of other case members are mounted inside a hollow case member (hereinafter, also referred to as a first case member) 51 and arranged on both sides of the case member 51. A sealing device for maintaining airtightness between case members (hereinafter, also referred to as second and third case members) 52 and 53 is known, and this sealing device is configured as follows.

[0003] First, a tubular reinforcing member 61 is fitted inside the first case member 51, and a lip-shaped sealing portion 62 is vulcanized and bonded to the upper end of the reinforcing member 61.
Are in close contact with the lower surface of the second case member 52. In addition, the first and third case members 5 are provided as separate sealing components from the sealing component including the reinforcing member 61 and the sealing portion 6.
A paper gasket 63 is mounted between the first and third gaskets. As shown in FIG. 8, a sealing device in which a rubber-only packing 64 is mounted between the first and third case members 51 and 53 instead of the paper gasket 63 is also known.

[0004] These sealing devices are provided with the above-mentioned sealing portion 6.
2 to maintain airtightness between the first and second case members 51 and 52, and a paper gasket 63 or a rubber-only packing 64 for the first and third case members 5
Although it is possible to maintain the airtightness between 1 and 53 and achieve the intended purpose, there are the following inconveniences.

[0005] First of all, the use of two sealing parts results in high parts costs and assembly costs. Further, in the case of a combination of the sealing component including the reinforcing member 61 and the sealing portion 62 and the paper gasket 63, since the paper gasket 63 is used, a gap is provided between the first and third case members 51 and 53. I ca n’t
Therefore, component accuracy and assembly accuracy are required. Further, in the case of a combination of the sealing component including the reinforcing member 61 and the sealing portion 62 and the rubber-only packing 64, the rubber-only packing 64 is used, so that the sealing space is required in the radial direction. Also, since it is necessary to ensure the pressure resistance of the rubber-only packing 64, the first and third case members 51, 53 are also required.
There cannot be a large gap between them, so that component accuracy and assembly accuracy are required.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention reduces the number of sealing parts and increases the dimensional accuracy and assembly accuracy of a case member to be mounted, thereby providing a cost-effective seal. It is an object of the present invention to provide a sealing device capable of providing a device and realizing space saving of a sealing space.

[0007]

In order to achieve the above object, a gasket of the present invention is mounted inside a hollow case member, and hermetically seals between a pair of other case members disposed on both sides of the case member. A gasket for holding
A cylindrical reinforcing member fitted inside the hollow case member, and one end side seal portion held by the reinforcing member, protruding in the axial direction from the reinforcing member, and closely contacting one of the other case members; And the other end side sealing portion which is also held by the reinforcing member, projects in the axial direction from the reinforcing member, and is in close contact with the other case member, and the axial length of the one end side sealing portion is The size is set to be at least twice as large as the dimensional variation between the pair of other case members, the axial length of the other end side seal portion is set smaller than the axial length of the one end side seal portion, and The other end side seal portion is disposed inside the reinforcing member.

[0008] As in the gasket of the present invention having the above-described structure, when a pair of seal portions are held at both ends of a cylindrical reinforcing member fitted inside a hollow case member, these are one. It is counted as a part, and it is possible to seal between the hollow case member and one other case member and between the hollow case member and the other case member with this one-piece sealing part. Become. Further, the axial length of the one end side seal portion, which is one of the pair of seal portions, is set to be at least twice as large as the dimensional variation between the pair of other case members. The deformation makes it possible to sufficiently absorb the dimensional variation between the pair of other case members. The axial length of the other end side seal portion on the opposite side in the axial direction is set smaller than the axial length of the one end side seal portion because the other end side seal portion is crushed by a load smaller than the crushing load of the one end side seal portion. Just do it. Since the other end side seal portion is disposed inside the reinforcing member, the other end side seal portion is backed up by the reinforcing member when a sealing fluid pressure such as a hydraulic pressure is applied. Further, since a rubber-only packing is not used as in the above-described prior art, it is possible to omit a seal space corresponding to this.

The cylindrical reinforcing member is preferably formed of a rigid material such as metal or resin, and is preferably formed as a cutting metal, a press metal, a resin part, or the like.

[0010] One end side seal portion and the other end side seal portion,
Both are molded integrally or separately from rubber-like elastic material,
It is preferable that the adhesive is vulcanized to the reinforcing member. The one end side seal portion having a relatively long axial length is preferably formed in a lip shape, and the other end side seal portion is preferably formed as follows.

A lip type seal is used. A lip-type seal is provided, and a sufficient rubber thickness (the other-end-side seal support portion in the embodiment described later) is set on the one-end-side seal portion side of the other-end-side seal portion of the lip type in the reinforcing member. A self-type seal is configured so that the other end side seal portion is crushed to the end surface of the reinforcing member by the crushing load of the seal portion. The self-type seal has a lip shape in which the sealing surface pressure is increased by a sealing fluid pressure acting from inside. Beat type seal. A beat type seal is provided, and a sufficient rubber thickness is set in the reinforcing member on one end side seal portion side of the other end side seal portion of the beat type, and the other end side seal portion is formed by crushing load of the one end side seal portion. It is assumed that the portion is crushed to the end surface of the reinforcing member.

Further, the gasket of the present invention is suitable for keeping the joint of three members airtight in a hydraulic path of various devices. As a specific example, a drum (corresponding to a hollow case member) in an automatic transmission of an automobile is used. And a drum seal that keeps the joint of the transmission case (corresponding to one other case member) and the valve body (corresponding to the other case member) airtight.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the gasket according to the present embodiment is mounted inside (inner peripheral side) a hollow case member (hereinafter, also referred to as a first case member) 51. A gasket for maintaining airtightness between a pair of other case members (hereinafter, also referred to as second and third case members) 52 and 53 disposed on both sides (in the axial direction), and is configured as follows. .

First, a tubular or annular reinforcing member 1 fitted inside the first case member 51 is provided. Inside the reinforcing member 1, an elastic body indicated by reference numeral 2 is added entirely. The elastic body 2 is integrally provided with one end side seal portion 3, a connection portion 4, the other end side seal support portion 5, and the other end side seal portion 6 in this order from the top.

The reinforcing member 1 is formed of a cutting metal, and has an annular projecting portion 1b integrally formed on the inner periphery of the upper end of a cylindrical portion 1a having a predetermined axial length. The reinforcing member 1 is mounted so as to be sandwiched between the lower surface of the inward flange portion 51a integrally formed on the inner periphery of the upper end of the first case member 51 and the upper surface of the third case member 53. is there.

The elastic body 2 is vulcanized and molded into a tubular or annular shape with a predetermined rubber-like elastic material, and is simultaneously vulcanized and bonded to the reinforcing member 1.

In the elastic member 2, firstly, the one end side seal portion 3 is formed so as to protrude upward in the shape of a lip on the upper surface of the overhang portion 1b, and is supported by the overhang portion 1b at the time of mounting. 52, and is backed up by a flange portion 51a disposed outside (outer peripheral side) thereof. The axial length of the one end side seal portion 3 is set to be sufficiently larger than the interval between the overhang portion 1b and the second case member 52, and the dimensional variation between the second and third case members 52 and 53 is varied. It is set to be twice as large as.

The connecting portion 4 is continuous with the inner peripheral surface of the lower end portion of the one end side seal portion 3 and is disposed on the inner peripheral side of the overhang portion 1b to form a minimum diameter portion of the gasket. The other end side seal support portion 5 continues to the lower surface of the lower end portion of the connecting portion 4 and is disposed below the overhang portion 1b and on the inner peripheral side of the cylindrical portion 1a.

The other end side seal portion 6 is formed so as to protrude downward from the lower surface of the other end side seal support portion 5 in a lip shape, and is supported by the other end side seal support portion 5 at the time of mounting. It is in close contact with the upper surface of the member 53, and is backed up by the cylindrical portion 1a disposed outside the upper surface. The other end side seal portion 6 is the self-type seal described above, and its axial length is one end side seal portion 3.
Is set smaller than the length in the axial direction.

The gasket having the above structure is mounted inside the three case members 51, 52, 53 as shown in the drawing, and is provided between the first and second case members 51, 52 and between the first and third case members 51, 52. , 53, and is characterized in that the following effects are achieved by the above configuration.

That is, first, the first case member 51
An elastic body 2 is vulcanized and bonded to a tubular reinforcing member 1 fitted inside the inside, and one end side seal portion 3 and the other end side seal portion 6 are integrally formed at both axial ends of the elastic body 2. Therefore, these components are collectively counted as one component, and the sealing component made of this one component is used to separate the space between the first and second case members 51 and 52 and the space between the first and third case members 51 and 53, respectively. It is possible to seal. Therefore, the number of sealing parts can be reduced as compared with the above-mentioned prior art, and the cost can be reduced in terms of parts cost and assembly cost of the sealing parts. If the number of parts is reduced, handling such as assembly is also facilitated.

Further, the axial length of the one end side seal portion 3 integrally formed with the one end portion of the elastic body 2 in the axial direction is at least twice as large as the dimensional variation between the second and third case members 52 and 53. Since the one end side seal portion 3 is pressed by the second case member 52 and elastically deformed at the time of mounting, the variation in dimensions between the second and third case members 52 and 53 can be sufficiently reduced. It is possible to absorb.
Further, since the other end side seal portion 6 with relatively little deformation is arranged on the other end side in the axial direction, the gap between the first and third case members 51 and 53 can be greatly enlarged. Therefore, as shown, between the first and second case members 51 and 52 or between the first and third case members 51 and 52,
Even if a gap 54 is formed between the first seal member 53 and the second seal member 53, the other end seal portion 3 keeps close contact with the upper surface of the third seal member 53. The required sealing action or sealing effect can be maintained, and at the same time, the dimensional accuracy and assembly accuracy of the case members 51, 52, 53 can be increased (reduced).
If the dimensional accuracy and the assembling accuracy of the case members 51, 52, 53 are increased, the case members 51, 52, 53 are increased.
It is possible to reduce the manufacturing cost and the assembling cost, and the cost can be reduced from this point as well.

Further, since the other end side seal portion 6 is disposed inside the cylindrical portion 1a of the reinforcing member 1, the other end side seal portion 6 is reinforced when a sealing fluid pressure such as a hydraulic pressure is applied. It is backed up by the cylindrical portion 1a of the member 1. Therefore, even when a large sealing pressure is applied, the other end side seal portion 6 is not pressed too strongly against the third case member 53, so that the magnitude of the contact pressure can be stabilized. The end seal portion 6 can be prevented from being damaged early. Similarly, since the one end side seal portion 3 is disposed inside the flange portion 51a of the first case member 51, the one end side seal portion 3 becomes the first case portion when a sealing fluid pressure such as a hydraulic pressure is applied. Member 51
Is backed up by the flange portion 51a. Therefore, even if a large sealing pressure is applied, the one end side seal portion 3 is not pressed too strongly against the second case member 52, so that the magnitude of the contact pressure can be stabilized. The seal portion 3 can be prevented from being damaged early.

Further, since a rubber-only packing is not used unlike the above-mentioned prior art, a seal space corresponding to this can be omitted, and space saving of the seal space can be realized.

Furthermore, the lower end, that is, the base end side of the one end side sealing portion 3 pressed against the second case member 52 at the time of mounting is supported by the overhanging portion 1b of the reinforcing member 1, so that one end against the vertical collapse is provided. The rigidity of the side seal portion 3 can be secured to some extent, and the reaction force can strongly press the one end side seal portion 3 against the second case member 52. Therefore, the contact pressure is set relatively high, and excellent sealing performance can be exhibited.

The configuration of the gasket according to the above embodiment can be added or changed as follows. Portions having the same configuration are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 2, the reinforcing member 1 is formed by a press fitting. This press fitting is formed in a substantially L-shaped cross section. As in the first embodiment, an annular overhang 1b is integrally formed on the inner periphery of the upper end of a cylindrical portion 1a having a predetermined axial length. ing.

As shown in FIG. 3, a required number of communication holes 1 c are formed in the flange portion 1 b of the reinforcing member 1, and a connection portion 4 which is a part of the elastic body 2 is disposed inside the communication hole 1 c. . According to this configuration, the joining force between the reinforcing member 1 and the elastic body 2 can be further increased.

As shown in FIG. 4, the elastic body 2 is vulcanized and bonded to the outside of the reinforcing member 1. The reinforcing member 1 is basically formed in a substantially rectangular cross section, and has an annular peripheral step 1d formed on the outer peripheral side of the upper end thereof and an annular peripheral step 1e formed on the inner peripheral side of the lower end thereof. Have been. The lower peripheral step 1
A required number of communication holes 1f are formed in the outer wall of e so as to penetrate in the radial direction. First, the elastic body 2 has one end side sealing portion 3 which is adhered to the inner surface of the upper peripheral step portion 1e and is formed so as to protrude upward in a lip shape. The upper surface covering portion 7 has a reinforcing member 1 on the surface.
Is integrally formed so as to cover the upper surface of the reinforcing member 1, and an outer surface covering portion 8 is integrally formed on the outer peripheral end of the upper surface covering portion 7 so as to cover the outer surface of the reinforcing member 1.
Are integrally formed in accordance with the communication holes 1f. At the inner end of each connecting portion 4, the other end side seal support portion 5 is located in the lower peripheral step portion 1e and is integrally formed, and the other end side seal support portion is formed on the lower surface of the other end side seal support portion 5. 6 are integrally formed.
Further, an annular projection 9 is integrally formed on the outer surface of the outer surface covering portion 8. The protrusion 9 is provided for the purpose of increasing the fitting load so that the gasket does not fall from the inside of the first case member 51 by its own weight when the gasket is attached to the inside of the first case member 51. It was formed.

As shown in FIG. 5, the other end side seal portion 6
Is a beat type seal. Further, as shown in the figure, a beat type seal is provided, and the other end side seal supporting portion 5 having a sufficient rubber thickness is provided above the other end side seal portion 6 of the beat type. It is assumed that the other end side seal portion 6 is crushed to the lower end surface of the reinforcing member 1 by the crushing load. As shown in FIG. 6, an annular concave portion 10 may be formed on the inner peripheral side and the outer peripheral side of the other end side seal portion 6 of the beat type so as to increase the pressing force of the beat to the second case member.

[0032]

The present invention has the following effects.

That is, in the gasket of the present invention having the above structure, first, a pair of seal portions are held at both ends of the cylindrical reinforcing member fitted inside the hollow case member. These are collectively counted as one part, and the sealing part made of this one part seals between the hollow case member and one other case member and between the hollow case member and the other case member. It is possible to Therefore, the number of sealing parts can be reduced as compared with the above-mentioned prior art, and the cost can be reduced in terms of parts cost and assembly cost of the sealing parts. The reduction in the number of parts also facilitates handling such as assembly.

In addition, since the axial length of the one end side seal portion, which is one of the pair of seal portions, is set to be at least twice as large as the size variation between the pair of other case members. By the elastic deformation of the seal portion, it is possible to sufficiently absorb the dimensional variation between the pair of other case members. In addition, the gap between the hollow case member and one of the other case members is greatly expanded because the other end side seal portion with relatively small axial length and relatively little deformation is arranged on the opposite side. It is possible to Therefore, even if a gap is provided between the hollow case member and one of the other case members or between the hollow case member and the other of the other case members, the one end side seal portion is attached to one of the other case members. The required sealing action or sealing effect can be maintained because the other end side seal part is kept in close contact with the other case member while maintaining close contact, and the dimensional accuracy and assembly accuracy of the case member are also expanded. can do. In addition, by increasing the dimensional accuracy and assembly accuracy of the case member,
The manufacturing cost and the assembly cost of each case member can be reduced, and the cost can be reduced from this point as well.

Further, since the other end side seal portion is disposed inside the reinforcing member, the other end side seal portion is backed up by the reinforcing member when a sealing fluid pressure such as a hydraulic pressure is applied. Therefore, even if a large sealing pressure is applied, the other end side sealing portion is not pressed too strongly against the other case member, so that the magnitude of the contact pressure can be stabilized. The end seal portion can be prevented from being damaged early.

Further, since a rubber-only packing is not used unlike the above-mentioned prior art, a seal space corresponding to this can be omitted, and space saving of the seal space can be realized.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a gasket according to a first embodiment of the present invention.

FIG. 2 is a half sectional view of a gasket according to a second embodiment of the present invention.

FIG. 3 is a half sectional view of a gasket according to a third embodiment of the present invention.

FIG. 4 is a half sectional view of a gasket according to a fourth embodiment of the present invention.

FIG. 5 is a half sectional view of a gasket according to a fifth embodiment of the present invention.

FIG. 6 is a half sectional view of a gasket according to a sixth embodiment of the present invention.

FIG. 7 is a half sectional view of a gasket according to a conventional example.

FIG. 8 is a half cut sectional view of a gasket according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement member 1a Cylindrical part 1b Overhang part 1c, 1f Communication hole 1d, 1e Peripheral step part 2 Elastic body 3 One end side seal part 4 Connection part 5 The other end side seal support part 6 The other end side seal part 7 Top cover part 8 Outer surface covering portion 9 Projecting portion 10 Concave portion 51 First case member (hollow case member) 51a Flange portion 52 Second case member (one other case member) 53 Third case member (the other other case member)

Claims (1)

[Claims] 1. A gasket that is mounted inside a hollow case member (51) and maintains airtightness between a pair of other case members (52) and (53) disposed on both sides of the case member (51). A cylindrical reinforcing member (1) fitted inside the hollow case member (51); and the cylindrical reinforcing member (1) held by the reinforcing member (1);
One end side sealing portion (3) protruding in the axial direction from the reinforcing member (1) and in close contact with one of the other case members (52).
And a second end side sealing portion (6) which is also held by the reinforcing member (1), projects in the axial direction from the reinforcing member (1), and is in close contact with the other case member (53). The axial length of the one end side seal portion (3) is set to be at least twice as large as the dimensional variation between the pair of other case members (52) and (53), and the other end side seal portion is provided. The axial length of (6) is set smaller than the axial length of the one end side seal portion (3), and the other end side seal portion (6) is arranged inside the reinforcing member (1). A gasket, characterized in that: