JP3852521B2 - gasket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gasket which is a kind of sealing device.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, a pair of other case members (hereinafter, referred to as “first case members”) 51 are mounted on the inside of a hollow case member (hereinafter also referred to as “first case member”) 51 and disposed on both sides of the case member 51. A sealing device that keeps airtightness between the second and third case members 52 and 53 is known, and this sealing device is configured as follows.
[0003]
That is, first, a cylindrical reinforcing member 61 is fitted inside the first case member 51, and a lip-shaped seal portion 62 that is vulcanized and bonded to the upper end portion of the reinforcing member 61 is formed on the second case member 52. Close to the bottom. In addition, a paper gasket 63 is mounted between the first and third case members 51 and 53 as a separate sealing part from the reinforcing member 61 and the sealing part 6. A sealing device in which a rubber-only packing 64 is mounted between the first and third case members 51 and 53 as shown in FIG. 8 instead of the paper gasket 63 is also known.
[0004]
These sealing devices maintain the airtightness between the first and second case members 51 and 52 by the sealing portion 62 described above, and between the first and third case members 51 and 53 by the paper gasket 63 or the rubber only packing 64. Although it is possible to maintain airtightness and thus achieve the intended purpose, it has the following disadvantages.
[0005]
That is, first of all, since two seal parts are used, parts cost and assembly cost are required.
Further, in the case of the combination of the sealing member composed of the reinforcing member 61 and the sealing portion 62 and the paper gasket 63, a gap is formed between the first and third case members 51 and 53 because the paper gasket 63 is used. Therefore, parts accuracy and assembly accuracy are required.
Further, in the case of a combination of the seal member composed of the reinforcing member 61 and the seal portion 62 and the rubber-only packing 64, the rubber-only packing 64 is used, so that the seal space is required in the radial direction. In addition, since it is necessary to ensure the pressure resistance of the rubber-only packing 64, a large gap is not formed between the first and third case members 51 and 53, and therefore component accuracy and assembly accuracy are required.
[0006]
[Problems to be solved by the invention]
In view of the above points, the present invention reduces the number of seal parts and expands the dimensional accuracy and assembly accuracy of a case member that is a mounting counterpart, thereby providing a cost-effective sealing device and providing a seal space. It aims at providing the sealing device which can implement | achieve space saving.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the gasket of the present invention is a gasket that is attached to the inside of a hollow case member and maintains airtightness between a pair of other case members disposed on both sides of the case member, A cylindrical reinforcing member fitted inside a hollow case member, an end side seal portion which is held by the reinforcing member, protrudes in the axial direction from the reinforcing member, and is in close contact with one of the other case members; The other end side seal portion is also held by the reinforcing member, protrudes 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 axial length of the other end side seal portion is set to be smaller than the axial length of the one end side seal portion; The other end side It is characterized in that the pole tip is disposed inside of the reinforcing member.
[0008]
When a pair of seal portions are held at both ends of a cylindrical reinforcing member fitted inside a hollow case member as in the gasket of the present invention having the above configuration, these are counted as one part. Thus, it is possible to seal between the hollow case member and one of the other case members and between the hollow case member and the other other case member, respectively, by using the seal part formed of this one part. 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 twice or more the dimensional variation between the pair of other case members, the elasticity of the seal portion is reduced. Due to the deformation, it becomes 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. In addition, 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 hydraulic pressure is applied. Further, since the rubber-only packing is not used as in the prior art, it is possible to omit the seal space corresponding to this.
[0009]
The cylindrical reinforcing member is preferably molded from a rigid material such as metal or resin and molded as a cutting metal fitting, a press metal fitting, or a resin part.
[0010]
The one end side seal portion and the other end side seal portion are preferably formed of a rubber-like elastic material integrally or separately and vulcanized and bonded 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.
[0011]
(1) Use a lip type seal.
(2) A lip type seal is set, and a sufficient rubber thickness (the other end side seal support portion in the embodiment described later) is set in the reinforcing member on the one end side seal portion side of the other end side seal portion of this lip type. The self-type seal is configured such that the other end side seal portion is crushed to the end surface of the reinforcing member by the crushing load of the one end side seal portion. The self-type seal has a lip shape that increases the seal surface pressure by the sealing fluid pressure acting from the inside.
(3) Use a beat type seal.
(4) A beat type seal is set, 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 this beat type. It is assumed that the end seal portion is configured to be crushed to the end surface of the reinforcing member.
[0012]
Further, the gasket of the present invention is suitable for hermetic holding of the joining portion of the three members in the hydraulic path of various devices, and as a specific example, a drum (corresponding to a hollow case member) in an automatic transmission of an automobile, There may be mentioned a drum seal for hermetically maintaining a joint portion composed of a transmission case (corresponding to one other case member) and a valve body (corresponding to the other case member).
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0014]
As shown in FIG. 1, the gasket according to this embodiment is mounted on the inner side (inner peripheral side) of a hollow case member (hereinafter also referred to as a first case member) 51, and both sides (axial direction) of the 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 arranged on both sides), and is configured as follows.
[0015]
That is, first, a cylindrical or annular reinforcing member 1 fitted inside the first case member 51 is provided, and an elastic body generally indicated by reference numeral 2 is vulcanized and bonded to the inside of the reinforcing member 1. The one end side seal portion 3, the connecting portion 4, the other end side seal support portion 5 and the other end side seal portion 6 are integrally provided in this elastic body 2 in order from the top.
[0016]
The reinforcing member 1 is formed of a cutting metal fitting, and an annular projecting portion 1b is integrally formed on the inner periphery of the upper end portion of the 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 51 a formed integrally with the inner periphery of the upper end portion of the first case member 51 and the upper surface of the third case member 53. is there.
[0017]
The elastic body 2 is vulcanized and molded in a cylindrical or annular shape with a predetermined rubber-like elastic material, and is vulcanized and bonded to the reinforcing member 1 simultaneously with the vulcanization molding.
[0018]
Of the elastic body 2, the one end side seal portion 3 is formed so as to protrude upward in a lip shape on the upper surface of the overhang portion 1 b, and is supported by the overhang portion 1 b when attached to the lower surface of the second case member 52. And is backed up by a flange portion 51a disposed on the outer side (outer peripheral side). The length in the axial direction of the one end side seal portion 3 is set to be sufficiently larger than the distance between the protruding portion 1b and the second case member 52, and the dimensional variation between the second and third case members 52 and 53 is large. It is set to a size that is at least twice as large.
[0019]
The connecting portion 4 is connected to 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 is connected 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 tubular portion 1a.
[0020]
The other end side seal portion 6 is formed to project downward in a lip shape on the lower surface of the other end side seal support portion 5, and is supported by the other end side seal support portion 5 when attached to the third case member 53. While being in close contact with the upper surface, it is backed up by a cylindrical portion 1a arranged outside thereof. The other end side seal portion 6 is the self-type seal described above, and its axial length is set smaller than the axial length of the one end side seal portion 3.
[0021]
As shown in the figure, the gasket having the above configuration is mounted inside the three case members 51, 52, 53, and between the first and second case members 51, 52 and between the first and third case members 51, 53. The above structure is characterized in that the following effects can be obtained.
[0022]
That is, firstly, the elastic body 2 is vulcanized and bonded to the cylindrical reinforcing member 1 fitted inside the first case member 51, and the one end side seal portion 3 and Since the other end side seal portion 6 is integrally formed, these are collectively counted as one part, and the first and second case members 51 and 52 and the first case are provided with a seal part made up of this one part. It is possible to seal between the third case members 51 and 53. Therefore, the number of seal parts can be reduced as compared with the above prior art, and therefore, the cost can be reduced first from the viewpoint of the part cost and assembly cost of this seal part. If the number of parts is reduced, handling such as assembly will be facilitated.
[0023]
Further, the axial length of the one end side seal portion 3 formed integrally with one end portion in the axial direction of the elastic body 2 is set to be twice or more the size variation between the second and third case members 52 and 53. Therefore, when the one end side seal portion 3 is pushed by the second case member 52 and is elastically deformed at the time of mounting, the variation in dimensions between the second and third case members 52 and 53 is sufficiently absorbed. Is possible. Further, since the other end side seal portion 6 with relatively little deformation is disposed 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, even if a gap 54 is opened between the first and second case members 51, 52 or between the first and third case members 51, 53 as shown in the drawing, the one end side seal portion 3 remains on the lower surface of the second case member 52. Since the other end side seal portion 6 is kept in close contact with the upper surface of the third seal member 53, the necessary sealing action or sealing effect can be maintained, and the case members 51, 52, 53 can be maintained together. The dimensional accuracy and assembly accuracy can be expanded (reduced). Further, if the dimensional accuracy and assembly accuracy of the case members 51, 52, and 53 are increased, the manufacturing cost and assembly cost of the case members 51, 52, and 53 can be reduced. Can.
[0024]
In addition, since the other end side seal portion 6 is disposed inside the cylindrical portion 1 a of the reinforcing member 1, the other end side seal portion 6 of the reinforcing member 1 is subjected to a sealing fluid pressure such as hydraulic pressure. It is backed up by the cylindrical part 1a. Therefore, even when a large sealing pressure is applied, the other end side seal portion 6 is not excessively pressed against the third case member 53, and thus the magnitude of the contact pressure can be stabilized. It is possible to prevent the end side seal portion 6 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 is placed in the first case when a sealing fluid pressure such as hydraulic pressure is applied. The flange 51a of the member 51 is backed up. Therefore, even if a large sealing pressure is applied, the one-end-side seal portion 3 is not excessively pressed against the second case member 52, so that the magnitude of the contact pressure can be stabilized, and the one-end side can be stabilized. It is possible to prevent the seal portion 3 from being damaged early.
[0025]
Further, since the rubber-only packing is not used as in the above prior art, the seal space corresponding to this can be omitted, and the space saving of the seal space can be realized.
[0026]
Furthermore, since the lower end, that is, the base end side of the one end side seal portion 3 pressed against the second case member 52 at the time of mounting is supported by the overhang portion 1b of the reinforcing member 1, one end side seal portion against crushing in the vertical direction. 3 can be secured to some extent, and the one end side seal portion 3 can be strongly pressed against the second case member 52 by the reaction force. Therefore, the contact pressure is set to be large, and excellent sealing performance can be exhibited.
[0027]
About the gasket which concerns on the said embodiment, the structure can be added and changed as follows. About the part which a structure overlaps, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0028]
(1) As shown in FIG. 2, the reinforcing member 1 is formed of a press fitting. This press fitting is formed in a substantially L-shaped cross section, and an annular projecting portion 1b is integrally formed on the inner periphery of the upper end portion of the cylindrical portion 1a having a predetermined axial length as in the first embodiment. ing.
[0029]
(2) As shown in FIG. 3, a required number of communication holes 1c are formed in the flange portion 1b 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 1c. . According to this configuration, the joining force between the reinforcing member 1 and the elastic body 2 can be further increased.
[0030]
(3) 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 an annular peripheral step 1d is formed on the outer peripheral side of the upper end portion, and an annular peripheral step portion 1e is also formed on the inner peripheral side of the lower end portion. Has been. Further, a required number of communication holes 1f are formed in the outer wall of the lower circumferential step portion 1e so as to penetrate in the radial direction. First, the elastic body 2 has one end side seal portion 3 that is bonded to the inner surface of the upper peripheral step portion 1e and that protrudes upward in a lip shape. The outer periphery of the lower end portion of the one end side seal portion 3 The upper surface covering portion 7 is integrally formed on the surface so as to cover the upper surface of the reinforcing member 1, the 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, and the outer surface covering portion The connecting portion 4 is integrally formed on the inner peripheral surface of the lower end portion of 8 in accordance with the communication hole 1f. Also, the other end side seal support portion 5 is located in the lower peripheral step portion 1e at the inner end of each connecting portion 4 and is integrally formed, and the other end side seal portion is formed on the lower surface of the other end side seal support portion 5. 6 is integrally molded. Furthermore, an annular protrusion 9 is integrally formed on the outer surface of the outer surface covering portion 8. This protrusion 9 is 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 is formed.
[0031]
(4) 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 another end side seal support portion 5 having a sufficient rubber thickness is provided above the other end side seal portion 6 of this beat type, and the one end side seal portion 3 is provided. The other end side seal portion 6 is configured to be crushed to the lower end surface of the reinforcing member 1 by the crushing load. As shown in FIG. 6, an annular recess 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 pressure contact force of the beat against the second case member.
[0032]
【The invention's effect】
The present invention has the following effects.
[0033]
That is, in the gasket of the present invention having the above-described configuration, first, a pair of seal portions are held at both ends of the cylindrical reinforcing member fitted inside the hollow case member. And sealing the space between the hollow case member and one of the other case members and between the hollow case member and the other case member with a sealing component made of this one component. Is possible. Therefore, the number of seal parts can be reduced as compared with the above prior art, and therefore, the cost can be reduced first from the viewpoint of the part cost and assembly cost of this seal part. In addition, by reducing the number of parts, handling such as assembly is facilitated.
[0034]
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 more than twice the size variation between the pair of other case members, Due to the elastic deformation, it is possible to sufficiently absorb the dimensional variation between the pair of other case members. In addition, since the other end side seal part with relatively small axial length and relatively little deformation is arranged on the opposite side, the gap between the hollow case member and one other case member is greatly expanded. Is possible. Therefore, even if a gap is formed between the hollow case member and one other case member or between the hollow case member and the other case member, the one end side seal portion is connected to the other case member. Since the other end side seal portion keeps in close contact with the other case member, the necessary sealing action or sealing effect can be maintained, and the dimensional accuracy and assembly accuracy of the case member can be expanded. can do. Further, by increasing the dimensional accuracy and assembly accuracy of the case member, it becomes possible to reduce the manufacturing cost and assembly cost of each case member, and the cost can also be reduced from this point.
[0035]
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 hydraulic pressure is applied. Therefore, even if a large sealing pressure is applied, the other end side sealing portion is not excessively pressed against the other case member, and thus the size of the contact pressure can be stabilized. It is possible to prevent the end side seal portion from being damaged early.
[0036]
Furthermore, since the rubber-only packing is not used as in the above prior art, the seal space corresponding to this can be omitted, and the 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 gasket according to a third embodiment of the present invention. Fig. 4 is a half cut sectional view of a gasket according to a fourth embodiment of the present invention. Fig. 5 is a half cut sectional view of a gasket according to a fifth embodiment of the present invention. Fig. 6 is a sixth embodiment of the present invention. Fig. 7 is a half cut 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.
DESCRIPTION OF SYMBOLS 1 Reinforcement member 1a Tubular part 1b Overhang | projection part 1c, 1f Communication hole 1d, 1e Circumferential step part 2 Elastic body 3 One end side seal part 4 Connection part 5 Other end side seal support part 6 Other end side seal part 7 Upper surface cover part 8 Outer surface covering portion 9 Protruding portion 10 Recessed portion 51 First case member (hollow case member)
51a Flange part 52 2nd case member (one other case member)
53 Third case member (other case member)

Claims (1)

A gasket that is attached to the inside of a hollow case member (51) and that 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), held by the reinforcing member (1), protrudes in the axial direction from the reinforcing member (1), One end side seal portion (3) in close contact with the other case member (52), and similarly held by the reinforcing member (1), protrudes in the axial direction from the reinforcing member (1), and the other case member ( 53) and the other end side seal portion (6) in close contact with,
The axial length of the one end-side seal portion (3) is set to be twice or more the size variation between the pair of other case members (52) (53), and the other end-side seal portion The axial length of (6) is set to be 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 by being.

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