JPH0424111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dust cover for a vehicle internal combustion engine.

[Prior Art] In a vehicle internal combustion engine, a clutch case is coupled to a rear end wall of a cylinder body, and a transmission case is coupled to a rear end wall of the clutch case.

Since the engine crankshaft is located relatively below the cylinder body, the clutch case housing the large diameter flywheel projects somewhat downwardly from the cylinder body. The upper end flange of the oil pan, which is press-formed from a metal plate, is connected to the bottom of the cylinder body with bolts. From the above-mentioned circumstances,
A space is created between the oil pan and the clutch case at the rear end of the cylinder body.

The operating noise emitted from the crank chamber of the cylinder body through the oil pan resonates in the space between the oil pan and the clutch case. Further, vibration noise emitted from the flywheel via the clutch case resonates in the space between the oil pan and the clutch case.

In the soundproofing device disclosed in Japanese Utility Model Application Publication No. 56-22128, a horizontal flange is formed around the entire circumference of the cylinder body, clutch case, and transmission case that are joined together, and the cylinder body, clutch case, and transmission case are connected to the flange. A soundproof cover resembling a bathtub is attached to the lower half of the machine case. Therefore,
Although the above-mentioned soundproofing device can reduce engine operating noise and gear transmission noise from the cylinder body, the entire device is large and costs increase, and the installation space for the soundproofing cover on the vehicle body becomes large. ,
Despite the expected soundproofing effect, there are various drawbacks, such as the cooling ability of the lubricating oil being impaired and the need to remove the soundproofing cover when installing engine equipment.

[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to provide a simple structure and to suppress resonance and radiation of operating noise in the space between the oil pan and clutch case of the engine. An object of the present invention is to provide a dust cover for a vehicle internal combustion engine.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention covers the space between the oil pan and the lower end of the clutch case that protrudes below the lower end wall of the cylinder body. A flange formed on the rear edge of the cover body, which has a U-shaped cross section and is lined with soundproofing material, is connected to the front end wall of the clutch case with bolts, and the front edge is overlapped with the bottom wall surface and both side wall surfaces of the oil pan. It is a combination of

[Function] The dust cover is bent to have an arcuate cross-section as a whole, is lined with a soundproofing material such as rubber, and covers the space between the oil pan and the clutch case. One edge of the dust cover is elastically engaged with the bottom wall and both side walls of the oil pan. The flange on the other end of the dust cover is fixed to the end wall of the clutch case with bolts.

Engine operating noise is propagated from the crank chamber through the oil pan to the space between the oil pan and clutch case, but since the dust cover is lined with soundproofing material, engine operating noise is transmitted between the oil pan and clutch case. Suppress resonance in space. Since the dust cover seals the space between the oil pan and clutch case, it suppresses engine operating noise from radiating outside from the space between the oil pan and clutch case.

[Embodiment of the invention] As shown in FIG. 1, the bottom wall of the cylinder body 2,
In detail, the end flange 3 of the oil pan 3 is press-molded from a metal plate on the lower end wall of the crankcase.
a are overlapped and connected by bolts (not shown). A clutch case 6 is coupled to the rear end wall of the cylinder body 2, and a transmission case 7 is coupled to the rear end wall of the clutch case 6. As is known, since the crankshaft is arranged at the bottom of the cylinder body 2, the clutch case 6 protrudes downward from the bottom wall of the cylinder body 2 in relation to the flywheel connected to the crankshaft, and the oil pan 3 rear end wall 5
A space is created between the clutch case 6 and the portion of the clutch case 6 that protrudes below the cylinder body 2.

According to the present invention, it is possible to suppress the generation of muffled noise due to resonance of driving noise in the space between the rear end wall 5 of the oil pan 3 and the downwardly protruding portion of the clutch case 6, and also to suppress the generation of muffled noise due to resonance of driving noise. A dust cover 8 is provided to prevent dust from being thrown up into the space between the rear end wall 5 of the oil pan 3 and the downwardly protruding portion of the clutch case 6 and from adhering to the wall.

As shown in FIG. 3, the dust cover 8 according to the present invention is constructed by lining the inner surface of a cover body made of a metal plate having an arcuate cross section as a whole with a soundproofing material 19 such as rubber. dust cover 8
is integrally molded with a substantially semicircular arc-shaped flange 9 that abuts against the front end wall 6a of the clutch case 6, and the flange 9 is provided with a plurality of bolt holes 13a. The flange 9 is pasted with a packing 15 (FIG. 2) made of an elastic material such as rubber. dust cover 8
is the packing 15 of the flange 9 and the crunch case 6.
The bolt 13 is superimposed on the front end wall 6a of the front end wall 6a, and is fastened to the crunch case 6 by a bolt 13 passing through the bolt hole 13a. The dust cover 8 is integrally formed with a horizontal flange 16 by bending the upper end edge of the flange 9 which is divided into left and right parts, and the flange 16 has a bolt hole 12a.
can be established. The flange 16 is fastened to the lower end wall of the crankcase of the cylinder body 2 by bolts 12 with a rubber gasket in between.

As described above, the dust cover 8 lined with soundproofing material 19 has flanges 9 and 16 on the rear edge fixed to the crunch case 6 and the cylinder body 2, and a front edge 10 fixed to the bottom wall 4 and side wall of the oil pan 3. is strongly elastically engaged with. In this way, the dust cover 8 closes off the space between the rear end wall 5 of the oil pan 3 and the front end wall 6a of the clutch case 6.

In addition, the soundproofing material 19 lining the dust cover 8
It is more effective to use slightly hard butyl rubber, and even if asphalt material is applied to the inner surface of the dust cover 8, there is a considerable noise reduction effect.

[Effects of the invention] As mentioned above, the invention covers the space between the lower end of the clutch case, which protrudes below the lower end wall of the cylinder body, and the oil pan, and is lined with soundproofing material. A flange formed on the rear end wall of the cover body, which has a U-shaped cross section, is connected to the front end wall of the clutch case with bolts, and the front end edge is overlapped and joined to the bottom wall surface and both side walls of the oil pan. The space between the rear end wall and the front end wall of the clutch case is completely sealed by the dust cover, preventing muddy water and dust from entering the space, and the dust cover is lined with soundproofing material. It is possible to prevent the vibration noise propagated from the crank chamber or the flywheel from being resonated and amplified in the space and radiated to the outside.

In a cab-over type vehicle in which the driver's seat is disposed above the space, noise propagated to the driver's cab is significantly reduced, and the quietness of the driver's cab is improved.

The dust cover has an extremely small shape, is easy to manufacture and install, does not affect the installation space for the engine on the vehicle body, and does not interfere with engine maintenance or lubricant oil replacement.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an outline of a dust cover for a vehicle internal combustion engine according to the present invention, Fig. 2 is a side view of the dust cover, Fig. 3 is a front view thereof, and Fig. 4 is a plan view thereof. . 2...Cylinder body, 3...Oil pan, 6...
...Clutch case, 8...Cover, 9,16...
Flange, 12, 13... bolt, 15... packing, 19... soundproofing material.

Claims (1)

[Scope of utility model registration request] It covers the space between the oil pan and the lower end of the clutch case that protrudes below the lower end wall of the cylinder body, and has a soundproofing material formed on the rear edge of the cover body, which is lined with a U-shaped cross section. A dust cover for an internal combustion engine for a vehicle, characterized in that a flange is connected to the front end wall of a clutch case with bolts, and the front end edge is overlapped and connected to the bottom wall surface and both side wall surfaces of an oil pan.