JPH0613438Y2 - Oil pan mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an oil pan mounting device for mounting an oil pan on a cylinder block with a bolt through a rubber gasket.

(Prior Art) An oil pan is attached to the lower surface of a cylinder block of an automobile engine, and since it is necessary to maintain liquid tightness between them, a gasket for sealing is interposed between the joint surfaces of both. ing.

A metal gasket is also used as the gasket, but the metal gasket directly transmits the vibration generated in the cylinder block to the oil pan, which causes a problem that noise is generated in the oil pan. Therefore, a rubber gasket, that is, a rubber gasket, which absorbs the vibration of the cylinder block and prevents the generation of noise, is generally used.

FIG. 3 shows a state in which such a rubber gasket is interposed between an engine cylinder block and an oil pan. In the figure, on the lower surface 1a of the cylinder block 1,
The flange 2a of the oil pan 2 is fastened with a bolt 4 via a rubber gasket 3 having oil resistance.
The rubber gasket 3 has an annular shape that is in close contact with the lower surface 1a of the cylinder block 1 and the flange 2a of the oil pan 2 over the entire circumference so that the engine oil in the oil pan 2 does not leak, and as shown in FIG. It has a cross-sectional shape of. And, in this annular rubber gasket 3,
A bolt insertion hole 3a is formed at a position corresponding to the bolt insertion hole 2b of the cylinder block 1.

When the oil pan 2 is attached to the cylinder block 1, the bolt insertion holes 1b, 3a and 2b of the cylinder block 1, the rubber gasket 3 and the flange 2a of the oil pan 2 are aligned and the insertion holes 1b, 3a and 2b are aligned.
The bolt 4 is inserted through and the rubber gasket 3 is tightened and fixed. A cylindrical spacer 5 made of metal, for example, is fitted in the bolt insertion hole 3a of the rubber gasket 3 in order to adjust the tightening force of the bolt 4.

In this way, by being tightened with the bolts 4, the rubber gasket 3 is brought into close contact with the lower surface 1a of the cylinder block 1 and the upper surface of the flange 2a of the oil pan 2 with a predetermined surface pressure, and liquid tightness between them is secured. It

(Problems to be Solved by the Invention) However, in the above-mentioned conventional rubber gasket 3, the surface pressure of the peripheral portion tends to be higher than the surface pressure in the vicinity of the bolt insertion hole 3a when tightening and fixing, The gasket 3 is firmly adhered to the cylinder block 1 and the oil pan 2 and is unlikely to come off. For example, when the oil pan 2 is removed for maintenance or the like, the gasket 3 is liable to break in the middle and has a short life.

The present invention has been made in view of the above conventional problems, and when an oil pan is attached to a cylinder block via a rubber gasket, a desired surface pressure of the rubber gasket can be ensured, while the rubber gasket is attached to the cylinder block and the rubber block. An object of the present invention is to provide an oil pan mounting device that can be easily separated from the contact surface of the gasket.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, in an oil pan attaching device for attaching an oil pan to a cylinder block with a bolt through a rubber gasket, a rubber gasket and a rubber gasket A pair of bulges that are formed on both sides and have a biconvex lens shape in cross section so that the center of the rubber gasket in the width direction protrudes most, and bolt insertions that are provided in the rubber gasket over the pair of bulges. When the oil pan is attached to the cylinder block by the bolt through the rubber gasket and is installed in the hole and the bolt insertion hole, the bolt insertion is guided and the compression amount of the bulging portion of the rubber gasket is adjusted to the cylinder block and the oil. Limit it by touching the pan, and A tubular spacer that secures a predetermined gap between the cylinder block and the oil pan is provided.

(Operation) When the oil pan is attached to the cylinder block with the bolt through the rubber gasket, the spacer limits the compression amount of the bulging portion of the rubber gasket by contacting the cylinder block and the oil pan, and A predetermined gap is secured between both side edges and the cylinder block and the oil pan.

Therefore, in the joint surface between the cylinder block and the oil pan and the rubber gasket, a predetermined surface pressure is secured in the central portion, and the surface pressure becomes lower as the distance from the central portion increases.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

The oil pan mounting device of the present invention includes a rubber gasket 1
0 and a spacer 5, and FIG. 1 shows the cross-sectional shape of the rubber gasket 10. In the figure, the rubber gasket 10 has its center in the width direction bulged on both sides. Specifically, the rubber gasket 1 in cross section
Both surfaces 10a and 10b, which form a contact surface of 0, have curved surfaces that are convex outward, and have a biconvex lens shape. The rubber gasket 10 is composed of a member having excellent oil resistance, for example, a nitrile butadiene rubber (NBR) member.

Bolt insertion holes 10c are formed in the rubber gasket 10 at the center in the width direction and along the longitudinal direction thereof at appropriate intervals.

A tubular metal spacer 5 is fitted in the bolt insertion hole 10c of the rubber gasket 10, as shown in FIG.

The bulging height x at the center of the width of the rubber gasket 10 is appropriately determined from the relationship with the length of the spacer 5. That is,
When the gasket 10 is interposed between the cylinder block 1 and the oil pan 2 and tightened with the bolts 4, both ends of the spacer 5 and both surfaces 10a of the rubber gasket 10 and 1
When the amount of compression determined between 0b and 0b is large, both side portions of the rubber gasket 10 also come into close contact with the joint surface between the cylinder block 1 and the oil pan 2 and the peeling property deteriorates. On the other hand, if the compression amount is too small, when the rubber gasket 10 is interposed between the joint surfaces, a sufficient contact area cannot be secured between the joint surface and the rubber gasket 10, and the liquid tightness deteriorates. There is fear.

In this respect, also in the case of the oil pan mounting device of this embodiment, as shown in FIG.
The rubber gasket 10 is interposed between the lower surface 1a of the cylinder 1 and the upper surface of the flange 2a of the oil pan 2, and the bolt insertion hole 1b of the cylinder block 1, the bolt insertion hole 10c of the gasket 10, that is, the spacer 5 and the flange of the oil pan 2. The bolts 4 are inserted into the respective bolt insertion holes 2b of the bolt 2a, and they are fastened and fixed integrally. In this fastening and fixed state, both ends of the spacer 5 contact both the cylinder block 1 and the oil pan 2. ing. That is, the rubber gasket 10 is indicated by two-dot chain lines 10a 'and 10b' in FIG. 1 until the widthwise central regions of both surfaces 10a and 10b contact the joint surfaces of the cylinder block 1 and the oil pan 2 with both ends of the spacer 5. It is compressed as shown, and is in close contact with the lower surface 1a of the cylinder block 1 and the upper surface of the flange 2a of the oil pan 2 with a required contact area and contact pressure, respectively. However, in the rubber gasket 10, the adhesive force, that is, the surface pressure, gradually decreases from the central region in the width direction to the peripheral edge, and the rubber gasket 10 is reliably separated from the cylinder block 1 and the oil pan 2 in the peripheral region.

Therefore, the liquid tightness between the cylinder block 1 and the oil pan 2 is favorably maintained by ensuring a sufficient contact area with the rubber gasket 10. On the other hand, when removing the oil pan 2 from the cylinder block 1 for maintenance or the like, the inner peripheral edge and the outer peripheral edge of the rubber gasket 10 are not in close contact with the lower surface 1a of the cylinder block 1 and the upper surface of the flange 2a of the oil pan 2, so From the cylinder block 1 and the oil pan 2 to the rubber gasket 10
Is easily peeled off, and tearing is prevented.

In the above embodiment, the oil pan mounting device interposed between the cylinder block and the oil pan has been described, but the invention is not limited to this, and liquid tightness or airtightness is ensured, and a good gasket is used. Needless to say, the present invention can be applied to any kind of joint surface as long as it requires peelability.

(Effect of the Invention) Since the oil pan mounting device of the present invention is configured as described below, it has the effects described below.

The rubber gasket inserted between the cylinder block and the oil pan is brought into close contact with each joint surface in a desired area with a desired surface pressure by a spacer so as to maintain good liquid or air tightness.

Further, since the inner and outer peripheral edges of the rubber gasket are separated from the cylinder block and the oil pan by the gap between the cylinder block and the oil pan and the rubber gasket secured by the spacer, the rubber gaskets of the cylinder block and the oil pan are separated from each other. The rubber gasket can be easily peeled off from each joint surface, does not tear when peeled, and can be used repeatedly, resulting in significantly improved durability.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber gasket, FIG. 2 is a sectional view showing a state in which an oil pan mounting device of the present invention is interposed between a cylinder block and an oil pan, and FIG. 3 is a conventional rubber gasket in a cylinder. It is sectional drawing which shows the state interposed between the block and the oil pan. 1 ... Cylinder block, 2 ... Oil pan, 4 ... Bolt,
5 ... Spacer, 10 ... Rubber gasket.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An oil pan mounting device for mounting an oil pan to a cylinder block by means of a bolt through a rubber gasket, wherein the rubber gasket and the rubber gasket are respectively formed on both sides, and the width direction center of the rubber gasket is projected most. , A pair of bulging parts that have a biconvex lens shape in cross section, a bolt insertion hole that is provided in the rubber gasket over the pair of bulging parts, and is arranged in the bolt insertion hole, and the rubber gasket is inserted in the cylinder block. When the oil pan is attached by the bolts, it guides the insertion of the bolts and limits the compression amount of the bulging part of the rubber gasket by abutting on the cylinder block and the oil pan. Securing a certain gap with the oil pan An oil pan mounting device, characterized by comprising: