JPH0740123Y2 - gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is housed in a housing portion provided in the middle of the flow holes of a pair of casings, and abuts on the inner surface of the housing portion so that a gap between both casings is formed. The present invention relates to a sealing gasket.

[Prior Art] Conventionally, for example, in a fluid type automatic transmission for a vehicle using a torque converter, as shown in FIG. 5, a plurality of hydraulic oil flow holes 51, 52 are provided (a pair in the figure). A hydraulic circuit is formed by assembling the casings 53 and 54 of. A gasket 57 is accommodated in the accommodating portion 56 in the middle of the flow holes 51, 52, and the gasket 57 seals the gap S between the casings 53, 54.

As the gasket 57, the gasket shown in FIG. 4 is generally used from the viewpoint of being used under high pressure and high temperature. The gasket 57 is formed in a cylindrical gasket body 58 whose upper and lower ends are open, and is formed in the upper and lower end portions of the gasket body 58 and elastically deforms to form an inner surface 56 of the accommodating portion 56.
It is provided with a pair of annular seal lip portions 59 that press a and 56b. The gasket body 58 and the seal lip portions 59 are made of an elastic material such as rubber. Inside the gasket body 58, a metal insert 60 having a cylindrical shape is buried almost all over the height.
60 prevents the gasket body 58 from being deformed. The insert 60 is vulcanized and adhered to the gasket body 58.

[Problems to be Solved by the Invention] However, the conventional gasket 57 has the following problems.

Since only the seal lips 59 at both ends of the gasket body 58 are elastically deformed when the gasket 57 is assembled, the dimensional error of the casings 53, 54 that can be absorbed by the elastic deformation is about ± 0.5 mm, which is small. This is the seal lip part 5
When 9 is lengthened, the casing 53, 54 of the seal lip 59
This is because there is a risk that wrinkles may be formed in the pressing portion against and the hydraulic oil may leak from there.

The gasket 57 cannot be used under a pressure of 20 kgf / cm ² or more. This is because, as shown in FIG. 6, when it is repeatedly pressed at a pressure of 20 kgf / cm ² or higher at a high temperature of about 150 ° C., the bonded portion between the gasket body 58 and the insert 60 cannot withstand the pressure P, This is because the seal lip portion 59 may be inverted as shown by the chain double-dashed line in the figure, or the gasket body 58 may be cracked.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to be able to absorb the dimensional error even if the dimensional error of the casing is large, and further to use it at high temperature and high pressure for a long period of time. It is to provide a gasket that can.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is housed in a housing portion provided in the middle of a pair of casing through holes, and abuts against the inner surface of the housing portion so that both casings are In the gasket that seals the gap, the gasket has a tubular shape with both ends open, is formed longer than the length of the accommodating portion in the axial direction, and is capable of being compressed and deformed in the coaxial line direction when assembled, and the gasket main body. A seal lip portion formed at both end portions and elastically deforming to press the inner surface of the housing portion, and a seal lip portion that is embedded in an end portion of the gasket main body and together with the seal lip portion when the seal lip portion elastically deforms. The gist of the invention is a gasket including an undeformable insert that presses the inner surface.

[Operation] When the gasket is assembled in the casing, the gasket is sandwiched by both casings. Therefore, the seal lips at both ends of the gasket are deformed by their elasticity, pressing the inner surface of the housing portion, and the gasket body is compressed and deformed in the axial direction. Therefore, even when the dimensional error of the casing is large, the dimensional error can be absorbed by the both deformations.

Further, when the gasket is assembled, the insert presses the inner surface of the accommodating portion. Therefore, even if a high-temperature and high-pressure fluid passes through the gasket during use and the seal lip is pressurized by the fluid at this time, the presence of the insert prevents the seal lip from deforming toward the insert. It

[Embodiment] An embodiment in which the present invention is embodied as a gasket for a hydraulic circuit of an automatic transmission in an automobile will be described with reference to FIGS.

FIG. 1 is a perspective view showing a part of the gasket 1 of the present embodiment in a cutaway manner, and FIG. 2 is a partial sectional view showing an assembled state of the gasket 1. The gasket 1 is composed of a pair of upper and lower casings 2, It is used to seal the gap S between the three.

An upper flow hole 4 is formed in the upper casing 2 so as to extend in the vertical direction. On the coaxial line of the upper flow hole 4 in the lower casing 3, a lower flow hole 5 having a diameter slightly larger than that of the upper flow hole 4 is formed. At the upper end of the lower casing 3, which is an intermediate portion of the upper and lower flow holes 4, 5, a circular recess 6 is formed on the upper surface. Then, the lower surface 2a of the upper casing 2 and the recess 6
The inner bottom surface 6a and the inner peripheral surface 6b form a housing portion 7 for housing the gasket 1. Further, the upper and lower circulation holes 4 and 5 and the housing portion 7 constitute a part of a hydraulic circuit.

The gasket 1 includes a cylindrical gasket main body 8 having open upper and lower ends, and annular upper and lower seal lip portions 9 and 10 protruding from inner peripheral portions of upper and lower end portions of the gasket main body 8.
The gasket body 8 and the upper and lower seal lip portions 9 and 10 are integrally formed of an elastic material such as rubber. The vertical length 1 of the gasket body 8 is formed longer than the depth of the accommodating portion 7, that is, the length B in the axis L direction, so that the gasket body 8 is compressed and deformed when the gasket 1 is assembled. ing.

Further, the upper and lower seal lip portions 9 and 10 are formed so as to decrease in diameter as they go upward or downward, and the taper surfaces 9a and 10a on the outer periphery thereof are elastically deformed to the corresponding upper and lower seal lip portions 9 and 10. Along with this, the lower surface 2a of the upper casing 2 and the inner bottom surface 6a of the recess 6 are pressed.

An annular insert 11 made of a highly rigid metal is embedded in the outer peripheral portion of the upper end of the gasket body 8. The upper surface of this insert 11 is exposed from the upper end surface of the gasket body 8, and this exposed portion presses the lower surface 2a of the upper casing 2 together with the tapered surface 9a of the upper seal lip portion 9.

When the gasket 1 configured as described above is assembled in both upper and lower casings 2 and 3 as shown in FIG. 2, the gasket 1 is sandwiched from both upper and lower directions. Then, the upper and lower seal lip portions 9 and 10 are deformed by their own elasticity, the taper surface 9a of the upper seal lip portion 9 presses the lower surface 2a of the upper casing 2, and the taper surface 10a of the lower seal lip portion 10 is recessed 6 The inner bottom surface 6a of the is pressed.

Further, in this embodiment, the insert 11 is embedded only in the upper end portion of the gasket body 8. Therefore, the gasket body 8 is vertically compressed by sandwiching the upper and lower casings 2 and 3. At this time, since the gasket 1 is housed in the housing portion 7, the gasket body 8 is prevented from being deformed outward by the inner peripheral surface of the housing portion 7 even if it is compressed as described above. Therefore, the compressed gasket body 8
Transforms to escape inward.

As described above, in this embodiment, the gasket main body 8 is also compressed and deformed in addition to the elastic deformation of the upper and lower seal lip portions 9 and 10, so that the dimensional error is absorbed even when the dimensional error of the upper and lower casings 2 and 3 is large. be able to. That is, in the prior art, this absorbable dimensional error was ± 0.5 mm, whereas in the present embodiment it is possible to exhibit sufficient sealing performance even if there is a dimensional error of ± 1 to ± 1.5 mm. became.

Further, since the upper surface of the insert 11 is exposed from the upper end surface of the gasket body 8 in this embodiment, when the gasket 1 is assembled as described above, the insert 11
The upper surface is pressed while being in contact with the lower surface 2a of the upper casing 2. The insert 11 is made of metal having high rigidity.

Therefore, even if a high-temperature and high-pressure hydraulic oil passes through the gasket 1 during use and a large pressure P is applied to the upper seal lip portion 9 at this time, the presence of the insert 11 causes the upper seal lip portion 9 to move outward. It cannot escape to the left in FIG. 3, and the pressed state of the upper seal lip portion 9 is maintained. Therefore, the insert 11 and the gasket body 8
There may be cracks in the adhesion area with the upper seal lip 9
Are prevented from reversing. The conventional gasket could not be used under a pressure of 20 kgf / cm ² or more, whereas in the present embodiment, continuous use was possible even at a pressure of about 30 kgf / cm ² .

The present invention is not limited to the configuration of the above embodiment,
For example, the following modifications may be made without departing from the spirit of the invention.

(1) Although the upper surface of the insert 11 is exposed from the upper end surface of the gasket body 8 in the above embodiment, it is not always necessary to expose the upper surface of the insert 11 and the gasket body 8 may cover the upper surface of the insert 11 to some extent.

(2) The inserts 11 may be embedded in the upper and lower ends of the gasket body 8.

(3) In the above-described embodiment, the recess 6 is formed at the upper end of the lower casing 3, but the recess is provided at the lower end of the upper casing 2 to form the accommodating portion 7, or the upper and lower casings 2 and 3 are provided with recesses. Alternatively, it may be used as the accommodating portion 7.

[Advantages of the Invention] As described in detail above, according to the gasket of the present invention, even when the casing has a large dimensional error, the dimensional error is absorbed by the deformation of the seal lip portion and the gasket body, and the gap between the two casings is absorbed. Can be reliably sealed. Further, even if a high-temperature and high-pressure fluid passes through the gasket when a high pressure is applied to the seal lip portion, the insert receives the pressure and prevents the seal lip portion from being deformed. For this reason, it is possible to prevent cracks from occurring in the bonding portion between the insert and the gasket body and to prevent the seal lip portion from reversing, and it is possible to sufficiently withstand long-term use.

[Brief description of drawings]

1 to 3 show an embodiment embodying the present invention.
FIG. 3 is a perspective view of a gasket partially broken, and FIG. 2 is a sectional view showing a state where the gasket is housed in a housing part.
The figure is an enlarged view of the portion A in FIG. 4 to 6 show a conventional technique, FIG. 4 is a sectional view of a gasket, FIG. 5 is a sectional view showing a state in which the gasket is housed in a housing portion, and FIG. 6 shows a portion B in FIG. It is a figure which expands and shows. 2 ... Upper casing, 3 ... Lower casing, 4 ... Upper flow hole, 5 ... Lower flow hole, 7 ... Accommodating part, 8 ... Gasket body, 9 ... Upper seal lip part, 10 ... Lower seal lip part, 11 ... Insert, B ... Length of accommodation section, L ... Axis, S
… Gap.

Claims (1)

[Scope of utility model registration request] 1. A pair of casing (2, 3) through holes (4,5).
Both ends are opened in the gasket that is housed in the housing part (7) provided in the middle of the space and abuts the inner surface of the housing part (7) to seal the gap (S) between both casings (2, 3). A gasket body (8) which is tubular and is formed to be longer than the length (B) of the accommodating portion (7) in the direction of the axis (L), and which can be compressed and deformed in the direction of the coaxial line (L) during assembly. A seal lip portion (9, 10) which is formed at both ends of the gasket body (8) and elastically deforms to press the inner surface of the accommodating portion (7), and embedded in an end portion of the gasket body (8) And a non-deformable insert (11) for pressing the inner surface of the housing (7) together with the seal lip (9, 10) when the seal lip (9, 10) elastically deforms. Gasket to be.