JPS5811994Y2 - Structure to prevent vehicle engine vibration isolation covers from falling off - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a structure for preventing a vibration isolation type cover from falling off, which is attached to the main body of a vehicle engine via anti-vibration rubber or the like.

When attaching covers located at the bottom of a vehicle engine, such as an oil pan, to a cylinder block, conventionally a fourth cover was installed to prevent the oil pan etc. from vibrating.
As shown in the figure, the oil pan was installed in a floating manner using anti-vibration material.

In this figure, the upper end of the oil pan 31 is bent outward by approximately 90° over the entire circumference to form a support portion 31a, and this support portion 31a is formed by a rubber 32 which is a vibration isolating material.
It was embedded inside.

In order to attach the oil pan 31 to the lower surface of the cylinder block 1, the vibration isolating rubber 32 is fitted onto the stepped portion 33H of the fixing member 33, and the fixing member 33 is secured with an appropriate number of bolts 5.
Tighten the oil pan 3 to the cylinder block 1 with
1 was attached to cylinder block 1.

That is, in the conventional support structure for the oil pan 31, a process 7 for preventing the oil pan 31 from falling off is not performed between the support portion 31a of the oil pan 31 and the vibration isolating rubber 32.

For this reason, if there is a flying stone or the like while the vehicle is running and an impact is applied to the oil pan 31 from the outside, the support portion 31
There was a risk that the oil pan 31 would fall off from the cylinder block 1 due to the oil pan 31 becoming detached from the vibration isolating rubber 32.

In view of the above, this invention provides a cover fall prevention structure that prevents the vibration isolation type cover from falling off from the engine body even when an external impact force is applied to the vibration isolation type cover while the vehicle is running. The purpose is to

Next, this invention will be explained based on embodiments shown in the drawings.

In FIG. 1, 1 is a cylinder block of a vehicle engine, and 2 is an oil pan.

In the oil pan 2, not only the support portion 2a for attaching the oil pan 2 to the lower surface of the cylinder block 1 is bent outward at approximately 90 degrees with respect to the oil pan 2, but also the support portion 2a
The end portion of a is bent approximately 90 degrees downward with respect to the support portion 2a to form a folded portion 2b.

For this reason, the periphery of the oil pan 2 has an inverted U-shape.

3 is a large part of the support part 2a of the oil pan 2 and the folded part 2
It is a vibration-proof rubber which is fixed to these members by appropriate means in a shape that wraps around the parts b, and has a substantially rectangular cross section.

Here, the tip of the folded portion 2b of the oil pan 2 projects downward from the lower surface of the vibration isolating rubber 3.

Reference numeral 4 denotes a fixing member, and at the location where the oil pan 2 is attached to the cylinder block 1, an annular stepped portion 4a into which the vibration isolating rubber 3 is fitted is formed, similar to the conventional fixing member.

A first annular groove 4C is formed between this annular step portion 4a and the lower surface of the cylinder block 1.

This fixing member 4 is provided with a second annular groove 4b in the stepped portion 4a, and the width A of this groove 4b is slightly wider than the thickness of the folded portion 2b of the oil pan 2.

Note that the folded portion 2b does not need to be formed in an annular shape over the entire circumference.

The tip of the folded portion 2b of the oil pan 2 to which the vibration isolating rubber 3 is fixed as described above is fitted into the second annular groove 4b of the fixing member 4, and the vibration isolating rubber 3 is fitted into the stepped portion 4a.

Then, an appropriate number of fixing members 4 are attached to the lower surface of the cylinder block 1 with bolts 5.

In this way, the tip of the folded portion 2b of the oil pan 2 attached to the cylinder block 1 and the second
As shown in FIG. 1, there is a gap around the entire circumference of the folded portion 2b between the oil pan 2 and the annular groove 4b, and the oil pan 2 is supported by the cylinder block 1 in a floating state.

Therefore, while the vehicle is running, a flying stone or the like may collide with the outside of the oil pan 2, causing the oil pan 2 to move in the direction of arrow P in FIG.
That is, even when the support portion 2a on one side of the oil pan 2 is pushed in the direction of being removed from the vibration isolating rubber 3 fixed by the cylinder block 1 and the fixing member 4, the folded portion 2b of the oil pan 2 The tip of the second part of the fixing member 4
Since the oil pan 2 comes into contact with the wall of the annular groove 4b, the movement of the oil pan 2 is stopped.

This prevents the oil pan 2 from falling off from the mounting portion of the cylinder block 1.

FIGS. 2 and 3 show another embodiment of attaching vibration-proof rubber to the oil pan, and FIG. 2 shows the support portion 2a of the oil pan 2.
This is an example in which the anti-vibration rubber 3' is fixed only to the outside of the folded part 2b of the oil pan 2'.
The oil pan 2
When fixing the anti-vibration rubber 3" to the square hole 2'C, attach the leg 3" to the square hole 2'C.
A is fitted to ensure a secure connection between the oil pan 2' and the vibration isolating rubber 3''.

As described above, this invention includes a step portion formed on the inner peripheral surface side of an annular fixing member, and a vibration-proof rubber fitted in a first annular groove formed between the step portion and the lower surface of the engine. A vibration isolation type cover for a vehicle engine with a supporting part fixed to the
The supporting portion is bent within the vibration isolating rubber to protrude from the lower surface of the vibration isolating rubber, and the protruding portion is loosely fitted into a second annular groove formed in the stepped portion of the fixing member. ,
Even if the vibration-isolating cover moves within the stepped portion of the fixed member due to an external impact such as a flying stone while the vehicle is running, the end of the support portion of the cover will not come into contact with the annular groove wall of the fixed member. Since it stops, the vibration-isolating cover will not fall off the engine.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention; Figure 1 is a sectional view of the attachment part between the cylinder block and oil pan; Figure 2 is a cross-sectional view of the attachment part of the oil pan in Figure 1; FIG. 3 is a perspective view of another embodiment of FIG. 2; FIG. 4 is a cross-sectional view of the mounting portion between the cylinder block and oil pan of the conventional embodiment; FIG. . 1... Cylinder block, 2... Oil pan, 2a... Support part, 2b... Turned part, 3... Anti-vibration rubber , 4...Fixing member, 4a...Stepped portion, 4b...Second annular groove, 5...Mounting with bolt, 4C...
...first annular groove.

Claims (1)

[Scope of utility model registration request] An annular fixing member attached to the lower surface of a vehicle engine has a step portion formed on the inner circumferential side thereof, and a vibration isolating rubber fitted into a first annular groove formed between the step portion and the lower surface of the engine. In the vibration isolation type cover, the supporting part is bent within the vibration isolating rubber so as to protrude from the lower surface of the vibration isolating rubber, and this protruding part is formed on the step part of the fixing member. A structure that prevents the vibration isolation type cover from falling off, which is characterized by a loose fit in the annular groove of the cover.