JPS6029659Y2 - Cover mounting device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting device for covers in internal combustion engines and the like.

In general, in automobile internal combustion engines, rocker covers,
Various covers such as a front cover and containers such as an oil pan are attached to the engine body, and these are required to be attached with good sealing performance.

Therefore, in the past, as shown in FIGS. 1 and 2 (reference document, see Utility Model Application Publication No. 52-68745), the joint surface 2 of the mounting body (for example, cylinder head) 1 and the cover (for example, rocker cover) 3 An oil-tight backing 5 was interposed between the joint surface 4 of the holder and the joint surface 4, and this part was screwed together with a plurality of bolts 6.

However, in such a conventional cover mounting device, the flat backing 5 is simply tightened with bolts 6, so when tightening the bolts, only the parts near the bolt insertion holes on the joint surface 4 of the cover 3 are tightened. Since a large tightening force is applied, the central part between the bolts bulges upward as shown by the broken line in FIG. 2, which causes a problem in that the contact pressure at this part decreases and oil leaks occur.

In addition, since the cover 3 is rigidly connected by the bolts 6, vibrations from the mounting body 1 are easily transmitted to the cover 3 via the bolts 6, resulting in an increase in radiated noise from the cover 3. .

Therefore, the object of this invention is to solve the above-mentioned problems by attaching the covers with bolts through a sealing material having a predetermined shape that has both a sealing function and an elastic support function.

Hereinafter, embodiments of this invention will be described based on the drawings.

As shown in FIGS. 3 and 3A, a cover 3 such as a rocker cover is connected to the joint surface 2 of a mounting body 1 such as a cylinder head through a sealing material (packet) 7 of this invention and a spacer 8 with a flange. The surfaces (flange portions) 4 are screwed together with bolts 8.

As shown in FIGS. 4 and 5, the sealing material 7 includes a liquid-tight retaining portion 7A having a substantially circular cross section, which is crimped with a predetermined crushing margin between the two joint surfaces 2 and 4, and this liquid-tight Holding part 7
It is located in the flat plate part 7c on the outside of A and passes through the plurality of bolt insertion holes 4a formed in the joint surface 4 of the covers 3, and its protruding end 7b is expanded outward by the spacer 8 when the bolt 6 is tightened. It is composed of a cylindrical elastic support part 7B that elastically supports the covers 3 by doing so.

The liquid-tight holding portion 7A, elastic support portion 7B, and flat plate portion 7C are integrally formed of an elastic body such as rubber.

Also, the joint surface 4 of the covers 3 that the liquid-tight holding portion 7A comes into pressure contact with
A part of the liquid-tight holding portion 7A is formed in a substantially hemispherical shape over the entire circumference in correspondence with the circular shape of the liquid-tight holding portion 7A, increasing the contact area.

In addition, H' in the figure is the diameter dimension of the liquid-tight holding part 7A in the free state, and this is the dimension H when the cover is attached (this is the diameter of the spacer 8
Needless to say, it is set larger than , although it is affected by the length of .

By using such a sealing material 7, the covers 3
The sealing function between the mounting body 1 and the mounting body 1 is well maintained by the liquid-tight retaining portion 7A which can obtain a much larger crushing margin than the conventional flat packing 5.

Therefore, even if the joint surface 4 of the covers 3 is deformed as shown in FIG. 2 when the bolts are tightened, the liquid (oil) tightness at the center between the bolts will not be lost as in the conventional example.

On the other hand, since the covers 3 are elastically supported by the elastic support part 7B and are vibration-insulated from the mounting body 1, the rate at which vibrations on the mounting body 1 side are transmitted to the covers 3 via the bolts 6 and spacers 8 is significant. descend.

This reduces the vibration noise radiated from the covers 3.

Next, FIG. 6 shows another embodiment of this invention, in which the aforementioned sealing material 7 is fixed in advance to the joint surface 4 of the covers 3 by baking or the like.

Of course, the same functions and effects as in the previous embodiment can be obtained.

As explained above, according to this invention, the cover is attached to the mounting body with bolts through a sealing material of a predetermined shape that has both a sealing function and an elastic support function. This has the effect that the transmission of vibration from the mounting body side is suppressed, and the radiated noise of the covers can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a conventional mounting device, Fig. 2 is a front view showing its operating state, and Fig. 3 is a sectional view of the main part of this invention.
3A is a top view of FIG. 3, FIG. 4 is a sectional view of the sealing material, FIG. 5 is a perspective view, and FIG. 6 is an exploded view of another example of the invention. 1...Mounting body, 7...Sealing material, 3.
・Curved covers, 6...Bolts, 2, 4...Curved joint surfaces, 7A...Liquid-tight retaining part, 4a...
Bolt insertion hole, 7B...Bending elastic support part, 7C...
・Flat plate part.

Claims (1)

[Scope of utility model registration request] In a mounting device for covers in which the covers are attached to the mounting body with bolts via a sealing material, the sealing material held between the mounting body and the covers extends along the inside of the flat plate part and is attached to the mounting body through a sealing material. A liquid-tight holding part having a substantially circular cross section that is crimped with a predetermined crushing margin between the joining surfaces of the main body and the covers, and bolt insertion holes of the covers or the mounting main body formed at appropriate positions of the flat plate part. What is claimed is: 1. A mounting device for covers having a penetrating cylindrical elastic support portion formed integrally with an elastic body such as rubber.