JPS6332360Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a support structure for fixing covers such as an oil pan and a head cover of an engine to a cylinder block or the like.

[Prior art]

Various vibration-proofing and sound-proofing means are applied to the means for fixing to the cylinder block, especially covers such as engine oil pans and head covers, which vibrate with engine vibration and become a source of noise.

For example, a rubber sheet (packing) is provided between the lower surface of the flange of the cylinder block and the flange of the oil pan to prevent cylinder block vibrations from being directly transmitted to the oil pan. There is a structure.

However, although devices with this structure can reduce vibration and noise, the rubber sheet is greatly distorted and protrudes sideways, making it difficult to set the tightening torque for the fasteners (bolts). Causes variation. Furthermore, when the tightening force becomes locally large, the durability of the rubber sheet in that area decreases, causing the problem that the fixing tool becomes loose or falls off.

In addition, in order to prevent over-tightening of bolts when fixing the oil pan to the bottom surface of the cylinder block, a cylindrical spacer was installed between the cylinder block and the backup plate.
This is proposed by Publication No. 142648. but,
In the case of a device having this structure, there is a problem in that a fairly large spacer is used, and a wide gasket must be used.

Furthermore, since the studs are not used for tightening, the spacer must be fitted into the gasket hole, and the back-up plate must be assembled while being careful not to drop the spacer from the gasket, making positioning etc. complicated. There's a problem.

[Purpose of invention]

The present invention solves the problems of the conventional support devices for engine covers, allows covers to be easily tightened with a predetermined tightening force, and uses an elastic sealing member made of a rubber sheet and vibration damping elastic material. It is an object of the present invention to provide a support means that does not apply an excessive pressing force to a member and has excellent sealing performance.

A further object of the present invention is to provide a support means that can securely fix the fixing tool to the main body.

[Summary of the idea]

In order to achieve the above object, the support structure for engine covers according to the present invention is such that an elastic seal member is brought into contact with one surface of the flange portion of the covers in an opening of the engine body to close the opening, and is screwed onto the main body. The support structure is tightened by a stud, and has a threaded part at one end for screwing onto the main body, and an intermediate part adjacent to the threaded part and having a stepped part at one end with a larger diameter than the threaded part. , a stud having a threaded part for nut fitting at the other end, a ring-shaped member provided between the step part and the threaded part, and an elastic cylindrical member fitted into the intermediate part and abutting the flange part. , a damping elastic member laminated on the other surface of the flange portion, a presser plate, and a nut screwed into a threaded portion at the other end of the stud.

That is, the specific structure of the support device according to the present invention and its assembly method are as follows.

(1) Attach a threaded portion 7b to one end of the stud 7, which is a fixing device.
Then, an intermediate portion 7a is formed which has a larger diameter than this threaded portion 7b and has a stepped portion 7c at one end.

(2) A ring-shaped member 60 is fitted between the threaded portion 7b of the stud 7 and the intermediate portion 7a, and the intermediate portion 7a is closed.
The elastic cylindrical member 40 is fitted into the intermediate portion 7a, and the stud 7 is screwed onto the flange portion 1a of the cylinder block 1 of the engine.

(3) Elastic cylindrical member 4 fitted into the intermediate portion 7a
0, and the flange portion 31 of the cover 3 such as the oil pan is positioned.

(4) Further, an elastic seal member 4 and a damping elastic member 5 are laminated on both sides of the flange portion 31, respectively.

(5) A presser plate 6 is laminated on the outer surface of the damping elastic member 5, and the surface of the presser plate 6 is screwed into the threaded portion 7e provided at the end of the stud 7 with a nut 10 and tightened.

By configuring as described above, the stud 7
No matter how you tighten the nut 10 by screwing it into the threaded part 7e formed at the end of the nut, the tightening allowance is regulated, and as a result, the elastic sealing member 4 and the damping elastic member 5 are pressed with a predetermined pressure. can do.

The stud 7 also has an intermediate portion 7a formed next to the threaded portion 7b, and a stepped portion 7 formed on this end surface.
c, and when the stud 7 is screwed and fixed to the flange portion 1a, the ring-shaped member 60 is fitted and received by the stepped portion 7c, so this ring-shaped member 60 is a kind of It serves as both a washer and a positioning member, and the stud 7 can be reliably fixed to the flange portion 1a.

〔Example〕

One embodiment will be described below with reference to the drawings.

Fig. 1 is a front view showing the general structure of the engine.A head cover 2 is attached to the upper part of the cylinder block 1 of the engine, which is the main body, and an oil pan 3 is attached to the lower part. Oil pan 3 for block 1
The support device will be explained.

Figure 2 shows oil pan 3 to cylinder block 1.
The flange portion 31 of the oil pan 3 is disposed at the lower part of the flange portion 1a of the cylinder block 1 via an elastic seal member 4 (rubber packing). A vibration damping elastic member 5 and a presser plate 6 for equalizing the tightening pressure thereof are disposed at the lower part, and the stud 7, washers 8, 9 and nuts 10 are attached to the flange portion 1a of the cylinder block 1. It is something that is fixed and supported.

The stud 7 has a threaded portion 7b formed at one end,
an intermediate portion 7a having a stepped portion 7c formed adjacent to the threaded portion 7b and having a larger diameter than the threaded portion 7b;
Furthermore, it is composed of a ring-shaped protrusion 7d having a larger diameter than the intermediate part 7a, a portion having a smaller diameter than the protrusion 7d, and a threaded part 7e formed at the end.

When fixing this stud 7, the elastic cylindrical member 40 is fitted into the intermediate portion 7a, and the ring-shaped member 60 is placed at the stepped portion 7c, and the threaded portion 7b is inserted into the screw hole of the flange portion 1a. Screw them together.

The stud 7 includes an elastic seal member 4, a flange portion 31 of the oil pan 3, and a damping elastic member 5.
are stacked one after another, the presser plate 6 is applied to the protruding portion 7d, the washers 8 and 9 are fitted, and the nut 10 is screwed into the threaded portion 7e to complete the oil pan 3.
can be attached to the opening at the lower end of the cylinder block 1.

When fixing the stud 7 to the flange portion 1a, the ring-shaped member 60 is fitted and the threaded portion 7b is tightened to the flange portion 1a, so that the stud 7 is not screwed in any further.

Then, the nut 10 is screwed onto the threaded portion 7e while the presser plate 6 is pressed against the protruding portion 7d, so that the nut 10 cannot be screwed any further.

As mentioned above, the stud 7 is attached to the cylinder block 1.
The elastic seals located on both sides of the flange portion 31 of the oil pan 3 between the flange portion 1a and the holding plate 6 are fixed to the flange portion 1a of the oil pan 3, and the tightening state of the nut 10 is also regulated. The member 4 and the damping elastic member 5 are pressed with a predetermined pressure.

Therefore, since not only the elastic member 40 but also the tightening margins of the elastic seal member 4 and the elastic member 5 are maintained at a preset appropriate pressure, there is no fear of the above-mentioned malfunctions occurring in the conventional device, and the durability is improved. It is possible to provide an ideal support device for engine covers that is durable and reliable.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a schematic structure of an engine, and FIG. 2 is a longitudinal sectional view showing an enlarged main part of a support device in an embodiment of the present invention. 1...Cylinder block, 1a...Flange part, 3...Oil pan, 31...Flange part, 3
1a...Through hole, 4...Elastic sealing member, 5...
Vibration damping elastic member, 6... Presser plate, 7... Stud, 7a... Middle part, 7b... Threaded part, 7c
...Stepped portion, 7d...Protruding portion, 7e...Threaded portion, 4
0...Elastic cylindrical member, 60...Ring-shaped member.

Claims (1)

[Claims for Utility Model Registration] A support structure in which an opening of an engine body is closed by abutting an elastic seal member against one surface of a flange of a cover, and the support structure is tightened by a stud screwed onto the body, It has a threaded part at one end for screwing into the main body, an intermediate part adjacent to the threaded part and having a stepped part with a larger diameter than the threaded part at one end, and a threaded part for fitting with a nut at the other end. a stud, a ring-shaped member provided between the step portion and the threaded portion, and an elastic cylindrical member fitted into the intermediate portion and abutting the flange portion;
A support structure for engine covers, comprising a damping elastic member laminated on the other surface of the flange portion, a presser plate, and a nut screwed into a threaded portion at the other end of the stud.