JP4300385B2 - 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]
For example, as a gasket mounted between a pair of case members 51 and 52 having flow passages 53 and 54 such as a transmission case and an extension case in an automatic transmission of an automobile, a conventional O-ring, shown in FIG. A rubber only seal 55 or a pipe seal 56 shown in FIG. 6 is used.
[0003]
However, since the O-ring or the rubber-only seal 55 shown in FIG. 5 is formed of a single rubber-like elastic body, it has a disadvantage that its pressure resistance is relatively small, and a pair of case members. Since a large gap cannot be formed between 51 and 52, there is an inconvenience that the dimensional accuracy and assembly accuracy of the case members 51 and 52 must be set relatively high. In addition, in the pipe seal 56 of FIG. 6, if the pair of case members 51 and 52 are not accurately positioned with respect to each other in the horizontal direction in the figure, the pipe seal 56 is placed in the flow path openings 57 and 58 of both case members 51 and 52. In this case, there is a disadvantage that the pipe seal 56 cannot be mounted between the case members 51 and 52.
[0004]
[Problems to be solved by the invention]
In view of the above points, the present invention can exhibit excellent pressure resistance, and can set the dimensional accuracy and assembly accuracy of a pair of members such as the case member to be relatively low. And it aims at providing the gasket which can mount | wear with the said gasket between both members, even if it is a case where a pair of members, such as the said case member, are not positioned accurately.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a gasket according to the present invention is a gasket that is mounted between a pair of members having flow paths communicating with each other and seals a fluid flowing through the flow paths, and includes an annular reinforcing member and the gasket A rubber-like elastic body integrally formed with the reinforcing member, and the reinforcing member includes a small-diameter cylindrical portion made of a relatively small-diameter cylindrical portion located at one axial end portion of the gasket, and one end of the small-diameter cylindrical portion. A ring-shaped flat portion provided radially outward from the outer peripheral end of the flat portion, and a relatively large diameter located at the other axial end of the gasket. A large-diameter cylindrical portion formed of a cylindrical portion, and the rubber-like elastic body includes a small-diameter adherent portion attached to the small-diameter cylindrical portion, and a flat adherent portion attached to the flat portion. The large-diameter adherent part adhered to the large-diameter cylindrical part The small-diameter adherent portion and the small-diameter cylindrical portion serving as its core form a cylindrical insertion portion that is press-fitted into the flow passage opening of one member of the pair of members. The annular beat seal provided on the outer peripheral surface of the small-diameter adherent is fitted to the inner peripheral surface of the flow passage opening of the one member, whereby the gasket is removed from the flow passage opening of the one member. The gasket and the one member are sealed, and an annular single step portion is provided on the outer end surface of the flat adherend, and the one step portion contacts the outer end surface portion of the one member. The insertion depth of the gasket into the one member is determined, an inward lip is provided at the axial end of the large-diameter adherent, and the inward lip is the other of the pair of members. Contact with the end surface of the member Between gasket and the other member is sealed, the reinforcing member is characterized in that the backup unit that backs up the inward lip is provided.
[0006]
The gasket of the present invention having the above-described configuration is attached to one member by press-fitting an insertion portion provided at one end in the axial direction into the flow passage opening of one member, and at the other end in the axial direction. The inward lip provided is brought into close contact with the end surface portion of the other member, and the sealing function is exhibited only by bringing the inward lip into close contact with the end surface portion of the other member. At the same time, the installation is complete. Therefore, even if there is a relatively large gap between the pair of members, it is possible to seal between the two members, and even if the pair of members are not positioned with high accuracy, the gasket is mounted between the two members. It becomes possible.
[0007]
Further, since the inward lip that is in close contact with the end surface portion of the other member is provided radially inward or obliquely inwardly, the inward lip is adapted to the fluid pressure flowing through the flow path. For self-seal function. The inward lip is also backed up from behind by a backup portion provided at the axial end of the reinforcing member. Therefore, this inward lip portion is excellent in pressure resistance.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 shows a plan view of a gasket 1 according to an embodiment of the present invention, and a cross section taken along line A-O-A is shown in FIG. FIG. 3 shows the mounting state of the gasket 1.
[0010]
As described above, the gasket 1 according to the embodiment includes a pair of case members 51 provided with flow passages (also referred to as ports or oil ports) 53, 54 such as a transmission case and an extension case in an automatic transmission of an automobile. It is attached between 52 and is configured as follows.
[0011]
That is, the gasket 1 first has a cylindrical reinforcing member (also referred to as an inner ring) 2 and a rubber-like elastic body 3 integrally formed with the reinforcing member 2, and has one axial end thereof. A cylindrical insertion portion 4 that is press-fitted into the flow passage opening 57 of one case member 51 is provided, and an annular inward is in close contact with the end surface portion 59 of the other case member 52 at the other end in the axial direction. A lip (also referred to as lip, seal lip or lip seal) 5 is provided. The reinforcing member 2 and the rubber-like elastic body 3 are integrated with each other by insert molding.
[0012]
The reinforcing member 2 is formed of a predetermined rigid material such as metal or resin, and has a small-diameter cylindrical portion 2a composed of a relatively small-diameter cylindrical portion located at one axial end portion of the gasket 1, and the small-diameter cylindrical portion 2a. An annular flat surface portion (also referred to as a bent portion) 2b that is provided radially outward from one end of the flat surface portion 2b, and an axial end from the outer peripheral end of the flat surface portion 2b (the other axial end side). In addition, a large-diameter cylindrical portion 2c made of a relatively large-diameter cylindrical portion located at the other axial end of the gasket 1 is integrally provided. When the reinforcing member 2 is made of metal, the reinforcing member 2 may be a press metal fitting, a cutting metal fitting, or the like.
[0013]
The rubber-like elastic body 3 is made of a predetermined rubber, and is attached to the small-diameter cylindrical portion 2a of the reinforcing member 2 so that the small-diameter cylindrical portion 2a is embedded, and the planar portion of the reinforcing member 2 2b, a flat adherend 3b embedded in the flat portion 2b, and a large adhering portion 3c, embedded in the large diameter cylindrical portion 2c of the reinforcing member 2 and embedded in the large diameter cylindrical portion 2c. Is integrated.
[0014]
First of all, an annular beat seal 6 is provided on the outer peripheral surface of the small-diameter adherent portion 3a, and the insertion portion is composed of the small-diameter adherent portion 3a and the small-diameter cylindrical portion 2a of the reinforcing member 2 that is the core metal. 4 is fitted to the inner peripheral surface 57a of the flow passage opening 57 of one case member 51 with a predetermined margin, so that the gasket 1 is in one case. While being prevented from coming off from the flow path opening 57 of the member 51, the gap between the gasket 1 and one case member 51 is sealed. The small-diameter cylindrical portion 2a of the reinforcing member 2 is provided with a backup portion 7 that is located on the inner peripheral side of the beat seal 6 and backs up the beat seal 6 from the rear thereof. Is.
[0015]
Further, an annular single step portion 8 is provided on the outer end face of the flat adherend portion 3b, and the single step portion 8 is attached to one case member 51 of the gasket 1 when the outer end face portion of the one case member 51 is attached. By abutting 60, the insertion depth of the gasket 1 into one case member 51 is determined, and positioning is performed. The flat surface portion 2b of the reinforcing member 2 is provided with a backup portion 9 that is located inside the single step portion 8 and backs up the single step portion 8 from the back thereof, and therefore the positioning accuracy is sufficiently high.
[0016]
Further, the inward lip 5 is provided at the end portion in the axial direction of the large-diameter adherent portion 3c, and the inward lip 5 is provided on the end surface portion of the other case member 52. By abutting on 59, the gap between the gasket 1 and the other case member 52 is sealed. The inward lip 5 is provided obliquely inward so that the tip portion protrudes in the axial direction from the end portion of the reinforcing member 2, and the inward lip 5 is bent on the outer peripheral side thereof. An annular recess 10 is provided to facilitate the above. Further, the large-diameter cylindrical portion 2c of the reinforcing member 2 is provided with a backup portion 11 that is located on the outer peripheral side of the inward lip 5 and backs up the inward lip 5 from the rear side thereof. It is set high enough.
[0017]
Further, the inner diameter dimension of the large-diameter adherent part 3c in the rubber-like elastic body 3 is formed larger than the inner diameter dimension of the small-diameter adherent part 3a, and the inner diameter provided at the end of the large-diameter adherent part 3c. The inner diameter dimension of the orientation lip 5 is also made larger than the inner diameter dimension of the small-diameter adhered portion 3a. Further, the inner diameter dimension of the inward lip 5 is formed larger than the inner diameter dimension of the flow path 54 of the other case member 52. This is to prevent the inward lip 5 from falling into the flow path 54 as shown in FIG.
[0018]
As shown in FIG. 3, the gasket 1 having the above-described configuration is configured such that one case member 51 is formed by press-fitting the insertion portion 4 provided at one axial end portion thereof into the flow path opening 57 of the one case member 51. Is attached between the two case members 51, 52 by bringing the inward lip 5 provided at the other end in the axial direction into close contact with the end surface portion 59 of the other case member 52. Since the sealing function between the lip 5 and the other case member 52 is exhibited only by bringing the lip 5 into close contact with the end surface portion 59 of the other case member 52, the mounting can be completed only by this. Therefore, even if there is a relatively large gap between the pair of case members 51 and 52, it is possible to seal between the case members 51 and 52, thereby comparing the dimensional accuracy and assembly accuracy of the case members 51 and 52. Can be set low. Further, even when the pair of case members 51 and 52 are not accurately positioned with respect to each other, the gasket 1 can be mounted between the case members 51 and 52. A decrease in positioning accuracy can be allowed.
[0019]
Further, the inward lip 5 in close contact with the end surface portion 59 of the other case member 52 is provided obliquely inward so that the tip portion protrudes in the axial direction from the end portion of the reinforcing member 2 in its free state. Therefore, the inward lip 5 exhibits a self-sealing function against the fluid pressure flowing through the flow paths 53 and 54. The inward lip 5 is also backed up from behind by a backup portion 11 provided at the axial end of the reinforcing member 2. Accordingly, the inward lip 5 is excellent in pressure resistance, and can thereby exhibit excellent pressure resistance.
[0020]
The present invention includes the following technical ideas.
[0021]
The gasket (hydraulic seal) provided by the present invention is a gasket that is attached to one case member of various devices and keeps the airtightness between the pair of case members. This is a gasket used to keep the part airtight. Also, it is a gasket in which a cylindrical elastic body is fixed to a cylindrical reinforcing member, and the elastic body is integrally formed at both ends of the reinforcing member having a backup portion, and is fitted to the hole inner diameter surface of one case member It is a gasket having a beat seal to be mounted and a lip seal protruding in the axial direction from the reinforcing member and in close contact with the end surface of the other case member.
[0022]
In this gasket, the size of the seal lip in the vertical direction (axial direction) is at least twice as large as the dimensional variation between both end faces of the pair of case members (to absorb the dimensional variation) and hydraulic pressure. It is composed of a self-seal type seal lip that does not blow through. The reinforcing member is made of a press metal fitting, a cutting metal fitting, or a resin, and constitutes a backup portion for the beat seal crushing load and a backup portion for the lip reversal blow-by caused by the internal pressure of the lip seal.
[0023]
And by this structure, the pressure resistance of a seal | sticker can be improved and the clearance gap between case members can be expanded greatly by the combination of the lip seal which has a self-seal lip, and the backup part of a reinforcement member. Further, since the lip seal seals with the end surface of the case member, it is possible to eliminate the need for highly accurate positioning of the oil port.
[0024]
【The invention's effect】
The present invention has the following effects.
[0025]
That is, the gasket of the present invention having the above-described configuration is attached to one member by press-fitting the insertion portion provided at one axial end portion thereof into the flow passage opening of one member, and the other axial end portion. The inward lip provided on the other member is mounted between the two members by being brought into close contact with the other member, and the inward lip is brought into close contact with the end surface of the other member. In order to exert a sealing function between them, it is possible to complete the mounting by itself. Therefore, even if there is a relatively large gap between the pair of members, it is possible to seal between the two members, and thereby the dimensional accuracy and assembly accuracy of the pair of members can be set to be relatively low. Further, even if the pair of members are not accurately positioned with respect to each other, the gasket can be mounted between the two members, and accordingly, a decrease in the positioning accuracy of both members can be allowed.
[0026]
Further, since the inward lip that is in close contact with the end surface portion of the other member is provided inward in the radial direction or obliquely inward in the radial direction, the inward lip is against the fluid pressure flowing through the flow path. Demonstrates self-sealing function. The inward lip is also backed up from behind by a backup portion provided at the axial end of the reinforcing member. Therefore, this inward lip is excellent in pressure resistance, and can thereby exhibit excellent pressure resistance.
[Brief description of the drawings]
FIG. 1 is a plan view of a gasket according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line A-O-A in FIG. FIG. 5 is a half-cut sectional view showing a rubber-only seal mounting state according to a conventional example. FIG. 6 is a half-cut cross-sectional view showing a pipe seal mounting state according to a conventional example.
DESCRIPTION OF SYMBOLS 1 Gasket 2 Reinforcing member 2a Small diameter cylindrical part 2b Flat part 2c Large diameter cylindrical part 3 Rubber-like elastic body 3a Small diameter adherence part 3b Flat adherence part 3c Large diameter adherence part 4 Insertion part 5 Inward lip 6 Beat seal 7, 9, 11 Backup portion 8 Single step portion 10 Recess 51 One case member (one member)
52. The other case member (the other member)
53, 54 Flow path 57 Flow path opening 57a Inner peripheral surface 59 End surface portion 60 Outer end surface portion

Claims (1)

A gasket (1) is mounted between a pair of members (51) and (52) having flow paths (53) and (54) communicating with each other and seals a fluid flowing through the flow paths (53) and (54). And
An annular reinforcing member (2) and a rubber-like elastic body (3) integrally formed with the reinforcing member (2);
The reinforcing member (2) includes a small-diameter cylindrical portion (2a) including a relatively small-diameter cylindrical portion located at one axial end portion of the gasket (1), and a radially outer side from one end of the small-diameter cylindrical portion (2a) An annular flat surface portion (2b) provided toward the direction and an axial end from the outer peripheral end of the flat surface portion (2b) and located at the other axial end portion of the gasket (1) A large-diameter cylindrical portion (2c) composed of a relatively large-diameter cylindrical portion is integrally formed,
The rubber-like elastic body (3) includes a small-diameter adherent portion (3a) attached to the small-diameter cylindrical portion (2a), and a flat adherent portion (3b) attached to the flat portion (2b). And a large-diameter adhered portion (3c) adhered to the large-diameter cylindrical portion (2c),
The small-diameter adherent portion (3a) and the small-diameter cylindrical portion (2a) serving as a core metal thereof are formed in a flow path opening (57) of one member (51) of the pair of members (51) and (52). An annular beat seal (6) provided on the outer peripheral surface of the small-diameter adherence portion (3a) is formed in the cylindrical insertion portion (4) to be press-fitted into the flow passage opening of the one member (51) The gasket (1) is retained from the flow path opening (57) of the one member (51) by being fitted to the inner peripheral surface (57a) of (57), and the gasket (1) and The space between the one member (51) is sealed,
An annular single step portion (8) is provided on the outer end surface of the flat adherend portion (3b), and the single step portion (8) comes into contact with the outer end surface portion (60) of the one member (51). The insertion depth of the gasket (1) into the one member (51) is determined,
An inward lip (5) is provided at an axial end of the large-diameter adherend (3c), and the inward lip (5) is the other member of the pair of members (51) (52) ( 52), the gap between the gasket (1) and the other member (52) is sealed by abutting against the end surface portion (59) of
The reinforcing member (2) is provided with a backup portion (11) for backing up the inward lip (5) .

Images