JPS606718Y2 - Sound insulation sealing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound insulating seal member used, for example, in a sound insulating structure that covers an engine oil pan with a sound insulating cover.

Generally, the oil pan of an engine is attached to the lower end of the cylinder body via a sealing member, but the vibration of the cylinder body is transmitted and generates a large amount of noise, making it one of the main noise sources of the engine.

Therefore, it has been proposed to cover the outer periphery of the oil pan with a sound insulating cover, but the conventional cover has an incomplete sealing function and cannot provide a sufficient sound insulating effect.

The present invention is a sound insulating seal member that eliminates the drawbacks of the conventional sound insulating cover as described above. It is an object of the present invention to provide a sound insulating seal member which is capable of providing excellent installation workability.

The embodiment will be described below with reference to FIGS. 1 and 2 of the drawings.

Reference numeral 1 denotes an oil pan of the engine, which is disposed at the lower end of the cylinder body 2.

The oil pan has an appropriate gap S corresponding to its external shape.
A sound insulating cover 3 is attached to the sound insulating cover 3.

4 is the sealing member of the present invention, which is hollowed out of an endless elastic material;
A fitting recess 41 is formed in the center of the seal member main body 4a,
Further, a first lip 42 and a second lip 43 extending in a dogleg shape are provided on the sides thereof, and the fitting recess 41 is fitted into the upper end 31 of the sound insulation cover 3, and the first lip 42, the second lip 43 can be brought into elastic contact with the outer periphery of the oil pan 1.

An appropriate number of lower brackets 5 for supporting the sound insulation cover 3 are attached to the outer side of the sound insulation cover, and an elastic support member is attached to the upper bracket 7 supported on the cylinder body 2 by bolts 6 together with the flange 11 of the oil pan 1.
For example, they are attached by bolts 20 with rubber members 8 and 9 interposed therebetween.

Since the seal member according to the present invention is constructed as described above, when this is used as described above, the vibration propagation from the oil pan 1 to the sound insulation cover is caused by the sound insulation seal member 4 and the air gap S.
Even if the sound radiated from the outer surface 12 of the oil pan 1 does not leak from the gap S, the upper end of the gap S is blocked by the first lip 42 and the second lip 43 of the seal member 4. Since it is heavily sealed, leakage of the radiated sound as described above is more reliably prevented.

Furthermore, since the two lips according to the present invention are constructed as described above, the sealing member 4 can be made of a relatively soft elastic member while ensuring overall rigidity.
In the case of the embodiment described above, the transmission of vibrations from the oil pan 1 to the sound insulating cover 3 can be significantly reduced, and the damping effect thereof can also be enhanced.

As a result, the seal member 4 can sufficiently suppress leakage and transmission of sound from the oil pan 1 by simply fitting the seal member 4 around the entire upper end of the sound insulating cover 3, that is, by using only one endless seal member. It is possible.

Further, another effect of the present invention will be explained with reference to the above embodiment. Since the sealing member 4 is held by fitting the fitting recess 41 into the upper end of the sound insulating member 3, the sealing member 4 is not attached to the sound insulating cover 3. It is easy not only to attach the sound insulating cover 3 to the oil pan 1 while holding the seal member 4 at the upper end.

That is, when inserting the sound insulation cover into the oil pan 1 from the sealing member 4 side for installation, especially the two lips 42 and 43
In particular, the function of the lower lip 43 prevents the sound insulation cover 3 from shifting relative to the oil pan 1 (shifting of the position), so that the sound insulation cover 3 can be inserted into a predetermined position while maintaining an even gap, and the sound insulation cover 3 is The attachment of the cover 3 to the cylinder body 2 becomes extremely accurate and easy.

Furthermore, it is also advantageous for the insertion direction to be a direction in which the seal member 4 is more firmly fitted to the upper end of the sound insulating cover 3 in order to prevent the seal member from coming off.

If there is no lip 43, the rigidity in the lateral direction is weak, and there is a high possibility that it will be installed with the positional deviation as described above.

During installation, if the gap S is biased, the mounting portion of the sound insulating cover 3 to the cylinder body 2 will be misaligned.
This requires alignment, which not only impairs work efficiency, but also causes the sound insulating cover 3 to come into direct contact with the oil pan 1, which may even cause abnormal noise.

Furthermore, due to the positional deviation during insertion, the sealing member 4 may come off the upper end of the sound insulating cover, and it is extremely inefficient to work while making corrections.

On the other hand, the sound insulation seal member according to the present invention has the above-mentioned second lip in addition to the first lip, so it completely eliminates the problems such as the occurrence of abnormal noise due to the positional deviation and the deterioration of installation workability. Moreover, the sealing function can be ensured, and the leakage and transmission of sound from the member to be sound-insulated can be extremely effectively prevented.

Furthermore, in the embodiment described above, vibrations are not transmitted from the cylinder body 2 to the sound insulating cover 3 via the elastic support member.

As described above, the sound insulating seal member according to the present invention can very effectively insulate, for example, the sound radiated from the oil pan and the vibration propagation from the oil pan to the sound insulating cover, and has excellent installation workability. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. FIG. 2 is an enlarged sectional view of the seal member in the same embodiment. 1... Oil pan, 3... Sound insulation cover, 4... Seal member, 5... Lower bracket, 6, 20... Bolt ,7...
Upper bracket, 8, 9... Com member, 41.
...Fitting recess, 42...First lip, 4
3...Second lip, S...Gap.

Claims (1)

[Scope of utility model registration request] A sealing member used for a sound insulation structure that provides a certain space around a member to be sound insulated and covers it with a sound insulation cover, which has a fitting recess that fits into the upper end of the sound insulation cover approximately in the center of the main body, and has It is characterized by having a dogleg-shaped cross section as a whole with a first lip extending diagonally upward and a second lip extending diagonally downward, and having lip portions that contact at two places close to the member to be sound insulated. Sound insulation sealing material.