JP2005146909A - Oil pan gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing material sealing an oil pan and a block member used for an engine or an automatic transmission gear, and more specifically an improved technique of an oil pan gasket having a flange part. <P>SOLUTION: In this oil pan gasket provided with a surface layer made of an elastic material on the surface of a steel plate, a main body of the oil pan gasket is formed of a metallic plate, and a part of the metallic plate is extended. The extended part is folded around a bolt hole to form a double part of the metallic plate, and a seal part made of a seal material is formed on the surface of the metallic plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an oil pan used for an engine, an automatic transmission, or the like, and a sealing material that seals a block member, and more particularly, to an improvement of an oil pan gasket having a flange portion.

Conventionally, an oil pan for storing lubricating oil is attached to a lower portion of a cylinder block or a transmission case of a vehicle engine.
This type of oil pan is made of a vibration-damping steel plate, and bolt mounting holes are arranged in the flange portion. A gasket made of a sealing material is sandwiched between the flange portion and the block member and tightened to exert a sealing action.
In general, this oil pan uses a damping steel plate with a thickness of 1.2 to 1.6 mm for weight reduction and ease of forming, and is shaped so that it can be bent and drawn to store the required volume of oil. An oil pan is formed.

On the other hand, as a gasket member, in the past, cork gaskets formed by solidifying cork grains with an adhesive, elastic gaskets mainly composed of rubber, and liquid gaskets that are hardened after being applied to a sealing member in an indeterminate form In recent years, composite gaskets combining metal plates and elastic bodies have been developed and put into practical use.
Japanese Utility Model Publication No. 61-134548 Japanese Patent Publication No. 08-11979

In the oil pan gasket shown in Patent Document 1, a seal member is applied to the sealing surface by receiving a local surface pressure with a bead strip made of an elastic body provided on both sealing surfaces of a metal flat plate. It is difficult to maintain a constant clamping surface pressure between the vicinity of and other parts (mostly between the bolt parts) due to the strength of the flange, and the surface pressure of other parts of the bolt part is apt to be lowered. Sealing performance is reduced at places with such low surface pressure. If you tighten the bolt strongly against this, the periphery of the bolt will be tightened strongly, and if it is bad, the flange will be deformed. As a result, stress relaxation is likely to occur, resulting in a worse sealed state.

Even if a metal flat plate and an elastic body are combined in this way, an oil pan gasket using a metal plate and an elastic body in combination with a metal plate arranged in the same thickness and a structure that relies on the resilience characteristics of the elastic body. The pressure distribution in the vicinity of the bolt and other parts became non-uniform, resulting in partial stress relaxation and settling, leading to oil leakage and failing to function sufficiently.
For such inconvenience, as shown in Patent Document 2, a gasket assembly that includes a rail having a stopper formed on a necessary portion has been proposed. It cannot be provided at low cost.

An oil pan gasket according to claim 1 is an oil pan having a flange portion, and an oil pan gasket sandwiched between the flange portion and a block member to seal both members, and the main body of the oil pan gasket Forming a part of the metal plate, extending a part of the metal plate, folding the extended part around the bolt hole to form a double part of the metal plate, from the sealing material to the surface of the metal plate The seal portion is formed with a constant thickness.

The oil pan gasket according to claim 2 is characterized in that, in the seal portion according to claim 1, the seal portion is formed by removing the double portion.

According to a third aspect of the present invention, in the oil pan gasket according to the first or second aspect, the seal portion has a projecting ring projecting in a compression direction of the sealing member at a peripheral end portion thereof.

According to a fourth aspect of the present invention, in the oil vane gasket according to the first to third aspects, a part of the metal plate is extended at a plurality of positions, and the extended part is folded back to both sides around the bolt hole to form a double part. It is characterized by damaging.

As described above, according to the present invention, the oil pan gasket sandwiched between the flange portion and the block member of the oil pan is extended by partially extending the part formed of a metal plate and folding the vicinity of the bolt hole. A double part is formed. And the seal part is formed on the surface including this double part with a constant thickness, and by tightening this with the flange part and the block member, the bolt hole vicinity is tightened by the double part of the metal plate Since the size, that is, the tightening pressure, is limited to a certain level or more, appropriate tightening pressure is distributed to the other parts of the bolt hole with respect to the seal part. Can work.

In this way, the double part of the oil pan gasket compressed by folding the extension part receives high tightening surface pressure, while the seal part made of an elastic body is supported by a metal plate. However, the portion between the bolt holes has a sufficient mass and possesses high resilience, so that adhesion is ensured.

Therefore, the oil pan gasket formed by the structure as shown in claim 1 or 2 is arranged with the optimum material and shape for the strong compression receiving portion and the weak compression receiving portion, respectively, as described above. It is possible to distribute the optimum tightening pressure to the right place with the compression restriction on the oil and prevent not only the sealing performance and durability but also the buckling deformation of the flange of the oil pan.

FIG. 1 shows an embodiment of the invention of this application.
FIG. 2 shows an extended state of the metal plate in FIG.
FIG. 3 shows an embodiment formed by folding from the state of FIG.
FIG. 4 shows the AA ′ cross section of FIG.
FIG. 5 shows a BB ′ cross section of FIG.
FIG. 6 shows another embodiment.
FIG. 7 shows another embodiment.
FIG. 8 shows a CC ′ cross section of FIG.

FIG. 1 shows a state before the oil pan gasket 2 is attached to the oil pan 1 and fastened to the block member 3. From this state, the bolt 4 is fastened and compression-fixed.
In this oil pan gasket 2, a part of the metal plate 21 near the bolt hole 12 is extended to form an extended part 22, and the extended part 22 is folded back, for example, as shown in FIG. The double part 22a is formed. The seal portion 23 is formed from this state, and the oil pan gasket 2 is formed by arranging the entire oil pan gasket 2 to have a constant thickness as shown in FIGS. The double part 22a turned back at this time has a height comparable to the surface of the seal part 23 as shown in FIG.
At this time, the seal portion 23 may be formed by removing the double portion 22a.
Here, the oil pan gasket 2 can obtain an optimum tightening surface pressure adapted to each of the strong compression portion and the weak compression portion, and is an excellent oil pan exhibiting high sealing performance and durability without torque reduction. This is a sealed structure.

  1, FIG. 4 and FIG. 5 show an embodiment of the seal portion 23. Here, a projecting ring 23a projecting toward a mating member to be sealed to the peripheral end portion is provided, and the projecting ring 23a provides a local surface. The pressure can be increased to further improve the sealing performance.

  Next, FIG. 6, FIG. 7 and FIG. 8 show other embodiments of the extending portion 22, and the extending portion 22 is extended at a plurality of locations (preferably collectively), and the plurality of extending portions are extended. As shown in FIGS. 7 and 8, the portions 22 are alternately folded back to both sides around the bolt hole 12 to form a double portion 22a. After that, when the oil pan gasket 2 is formed by forming the seal portion 23 on the surface, the tightening pressure can be distributed over a wide range to the vicinity of the bolt hole 12 at the time of tightening. Can be provided.

As the metal plate 21 used here, various types such as SPCC (cold rolled steel plate), SPHC (hot rolled mild steel plate), aluminum plate, stainless steel plate and the like can be used, and the plate thickness is 0.2 to 0.8 mm. Something about is used.
Further, as the seal portion 23, a synthetic rubber such as NBR, ACM, AEM, FKM, VMQ, or the like, which has excellent elasticity of a synthetic resin is used.

Sectional drawing which shows the embodiment example of the oil pan gasket by this invention FIG. 1 is a plan view showing an extended state of a metal plate in FIG. FIG. 2 is a plan view showing an embodiment formed by folding from the state of FIG. AA 'sectional view of FIG. BB 'sectional view of FIG. Plan view showing another embodiment Plan view showing another embodiment CC 'sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil pan 12 Bolt hole 2 Oil pan gasket 21 Metal plate 22 Extension part 22a Double part 23 Seal part 3 Block member

Claims (4)

In an oil pan gasket having a flange portion, and an oil pan gasket sandwiched between the flange portion and the block member to seal both members,
The oil pan gasket body is formed of a metal plate,
Extending a part of the metal plate, forming the double part by folding the extension part around the bolt hole,
An oil pan gasket, wherein a seal portion made of a seal material is formed on the surface of the metal plate. In the oil pan gasket according to claim 1,
The oil pan gasket, wherein the seal portion is formed by removing the double portion. In the oil pan gasket according to claim 1 or 2,
The oil pan gasket, wherein the seal portion has a projecting ring projecting in a compression direction at a peripheral end portion thereof. In the oil vane gasket according to claims 1 to 3,
An oil vane gasket characterized in that a part of the metal plate is extended at a plurality of locations, and the extended part is folded back to both sides around the bolt hole to form a double part.

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