JPS6329169Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention improves the oil tightness of the gasket,
The present invention also relates to a gasket for engine covers that improves the workability of installing the covers.

A conventional gasket of this type is shown in Fig. 2-73 of the New Edition Automotive Engineering Handbook 4-37, published by Tosho Publishing Co., Ltd. on March 25, 1970. Also, a gasket as shown in Fig. 1 has been proposed. This example shows a gasket 3 used when mounting a lock cover 1 to a cylinder head 2. A-
The A section is generally circular as shown in Fig. 2a, with a bolt hole 3b formed in the bolt-through portion 3a, and the B-B section in Fig. 1 is doughnut-shaped as shown in Fig. 2b. This is to increase the surface pressure and maintain oil tightness. It is also thick to prevent noise from the lock cover 1, and is made of a heat-resistant, oil-resistant soft material such as rubber in an annular shape.

However, such conventional gaskets3
In this case, since it was molded from a soft material and had a long annular shape, it had poor shape retention and was very difficult to assemble. In addition, since it is quite thick, as the mounting bolts of the rocker cover 1 are tightened, pressure will be applied from the vicinity of the mounting bolts, so the part between the bolt holes 3b and 3b of the gasket 3 will be affected. As shown in FIG.
There is a risk that the mounting seat 2a will come off, creating a gap L, which poses a problem in that there is a risk of oil leaking from this gap L.

In order to solve this problem, it is possible to insert a core material made of metal, synthetic resin, etc. into the packing (for example, Japanese Utility Model Application No. 50-8359,
When molding such a gasket, the entire core material is inserted inside the gasket, making it difficult to mold the gasket and resulting in poor workability.

This invention was made to eliminate the above-mentioned drawbacks, and aims to solve the above-mentioned problems by improving the shape retention of the gasket.

This invention will be explained in detail below based on the drawings.

FIG. 4 is a plan view of a gasket showing an embodiment of this invention. First, to explain the structure, numeral 13 is a gasket made of a heat-resistant and oil-resistant soft material, and a bolt hole 13b is formed in a bolt penetration portion 13a. Reference numeral 14 denotes a core material made of metal, synthetic resin, etc., inserted into the gasket 13. Core material 1
C-C cross section of gasket 13 inserted in No. 4, D
-D cross section is shown in FIGS. 5a and 5b. The core material 14 is inserted into a required portion of the gasket 13, for example, the center of the gasket 13 as shown in FIG. 5a, and is exposed to the outside at the bolt penetration portion 13a as shown in FIG. 5b. The purpose of exposing the core material 14 is to hold the core material 14 from the outside at this exposed portion when molding the gasket 13 with a mold. The core material 14 is exposed. By doing this, since the gasket 13 originally forms the bolt penetration part 13a, it bulges in this part, so if the core material 14 is exposed in a circular arc shape further outside of this, it can be held very easily. At the same time, it also has the effect of protecting the outside of the gasket 13 at the bolt penetration portion 13a.

Gasket 13 with core material 14 inserted in this way
By using this, the shape retention of the gasket 13 is significantly improved, and the efficiency of the assembly work is improved. Further, since the bending rigidity between the bolt holes 13b is increased, reliable oil tightness can be achieved, and oil leakage due to the conventional problem shown in FIG. 3 is eliminated.

Incidentally, although the rocker cover was shown as an example in the above embodiment, it goes without saying that it is suitable as a sealing material for an oil pan and an engine block.

As explained above, this invention is made of a heat-resistant and oil-resistant soft material with an approximately circular cross section, which is molded into an annular shape.
The core material is inserted into the center of the entire circumference of the gasket, which has multiple bolt holes, and a portion of the core material is exposed in an arc shape to the outside of the gasket in each bolt hole. Since it is located at the center of the entire circumference of the gasket, there is no twisting and the shape retention properties of the gasket are improved.Therefore, there is no sag between the bolt holes when tightening the mounting bolts as in the conventional case. , no oil leakage occurs. Moreover, since the exposed part of the core material is provided in an arc shape outside the bulge for forming the bolt penetration part, it can be held extremely easily from the outside.
The gasket can be easily molded and a homogeneous product can be obtained. Furthermore, gaskets tend to bulge outward when tightened, and this is particularly noticeable at bolt penetrations, but in this design, the core material exposed in an arc shape prevents this bulge. , so there is little deformation of the gasket. Furthermore, since the shape retention characteristics are improved, effects such as improved assembly work efficiency can be obtained.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional gasket before assembly, Figures 2a and b are enlarged sectional views taken along lines A-A and B-B in Figure 1, and Figure 3 is an exploded perspective view of a conventional gasket. A plan view for explaining the situation of oil leakage caused by tightening the mounting bolt, FIG. 4 is a plan view of a gasket showing an embodiment of this invention,
FIGS. 5a and 5b are enlarged cross-sectional views taken along lines CC and D-D in FIG. 4. In the figure, 13 is a gasket, 13a is a bolt penetration part, 13b is a bolt hole, and 14 is a core material.

Claims (1)

[Scope of utility model registration request] In a gasket for an engine cover or the like, which has a substantially circular cross-sectional shape, is annularly formed from a soft material, and is provided with a plurality of bolt holes, a core material is inserted into the center of the entire circumference of the gasket, and the core material is inserted into the center of the entire circumference of the gasket. A gasket for an engine cover, characterized in that a portion of the core material is exposed in an arc shape to the outside of the gasket at each of the bolt holes.