JPH0348338B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in noise reduction structures for engine covers.

Vibration from the cylinder block is transmitted to engine covers such as the cylinder head cover and oil pan that make up the outside of the engine, which has the disadvantage of generating noise. No. 56-85050 proposes a reduction means. This is a system in which a hole such as a slit is formed in a flat part of a wall of an oil pan or the like, and the slit is filled with an elastic member to prevent vibrations from being transmitted by the slit and to absorb vibrations by the filling material. This elastic member bulges out on both sides of the slit it has penetrated, and the bulges pinch the periphery of the slit to create a seal, but if the bulge is set too large, it becomes difficult to attach it to the slit. In addition, there is a drawback that the seal that reduces the bulge is likely to be incomplete, making it impossible to achieve both ease of installation and sealing performance.

The present invention has been made to solve these conventional drawbacks, and provides a structure in which the elastic member can be easily attached and sealing can be reliably achieved. That is, the present invention provides a noise reduction structure in which a plurality of holes are formed in an engine cover such as a cylinder head cover and an oil pan that constitute the outside of the engine, and the holes are filled with an elastic member. A bulging portion is formed on both sides of the hole, and a pressing member is attached to press the bulging portion against the peripheral edge of the cover by pressing the elastic member from the side.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, an oil pan 1 has a flange 2 on its upper edge serving as a mounting surface for an engine 30.
The oil pan 1 is attached to the lower surface of the flange 2, and the side wall 3 and the bottom wall 4 are integrally formed with a flange 2 by sheet metal processing. A plurality of slits 5 are formed as holes at predetermined intervals in the side wall 3 at positions close to the flange 2, and the slits 5 are filled with a filler (elastic member) 6 made of an elastic material such as rubber to form a seal. ing. The filler 6 has bulges 61 and 62 on both the inner and outer sides of the slit 5, and these portions narrow the peripheral edge of the slit 5. Further, a pressing member 7 is pressed onto the inner surface of the filler 6, thereby pressing the bulging portion 61 against the side wall 3, thereby ensuring a reliable seal. Note that it is preferable that the pressing by the pressing member be performed from the side where the filler bulges out the most.

The pressing member 7 is stacked on the inner surface of the bottom wall 4 and
The filler material 6 is connected to the filler material 6 by spot welding or the like, and the filler material 6 rises at the peripheral edge and presses the filler material 6 from the side surface by its own elasticity at the upper end of the rising portion. At this pressing portion, as shown in FIG. 3, the side wall 3 is not contacted. This prevents the vibration transmitted by the side wall 3 from above from being transmitted by the slit 3 to the side wall 3 below it, whereas when the pressing member 7 comes into contact with both sides of the slit 3, This is because vibrations are transmitted through the pressing member 7, reducing the effect of the slit.

4 and 5 show another embodiment, in which pressing members 8 and 9 are applied from both inside and outside to the filler 6 filled in the slit 5, and these are pressed against the bolt and nut 10.
, thereby tightening the bulges 61 and 62 together.
is crimped onto the peripheral edge of the slit 5.

In any of the above configurations, the filler 6 is pressed against the periphery of the slit 6 by the pressing members 7, 8, and 9 to achieve a reliable seal, and for this reason, the bulging portion is set to be particularly large. There's no need.
Therefore, the filling material can be attached easily. In the above embodiment, only an example in which a slit is formed in the side wall 3 of the oil pan of the engine is shown, but the present invention can be similarly applied to the slit in the bottom plate or other covers such as a cylinder head cover. The same applies to other holes (round holes, etc.). Further, the pressing member may be fastened to the flange of the cover and the engine together with bolts or the like, thereby pressing the filling material.

As explained above, this invention is a noise reduction structure in which a hole is formed in the engine cover and a filler is filled in the hole, and the filler is held down by a separate member, so that the noise reduction function is not impaired. This makes it possible to easily attach the filler without any problems, and also ensures reliable sealing.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an oil pan showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line, Fig. 3 is an enlarged view of section A in Fig. 2, and Fig. 4 shows another embodiment. FIG. 5 is a sectional view of the filler attachment part, and FIG. 5 is an exploded perspective view thereof. DESCRIPTION OF SYMBOLS 1... Oil pan, 3... Side wall, 5... Slit, 6... Filler, 7, 8, 9... Pressing member.

Claims (1)

[Claims] 1. In a noise reduction structure in which a plurality of holes are formed in an engine cover such as a cylinder head cover and an oil pan that constitute the outside of the engine, and the holes are filled with an elastic member, the elastic member is placed on both sides of the through hole. Noise reduction in an engine cover, characterized in that a bulge is formed in the cover, and a pressing member is attached to press the bulge against the peripheral edge of the cover by pressing the elastic member from the side. structure.