JPS6226175A - Engine guard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine guard that covers and protects the crank and lower side of a case of an engine mounted on a motorcycle or the like.

[Conventional technology]

The engine of a motorcycle or the like includes a crankcase that covers a gear device such as a transmission along with a crankshaft.

This crankcase generally has both sides covered with crankcase covers that are attached via gaskets, and the clutch, generator, etc. are housed between the crankcase and the crankcase cover. .

Therefore, the crankcase cover can suppress noise emission, and the noise from the sides of the crankcase is relatively small.

[Problem that the invention seeks to solve]

However, in conventional engines of this type, the bottom of the crankcase forms the outer wall of the engine and is exposed to the outside, so noise is emitted from the bottom of the crankcase and there is a problem that noise cannot be reduced. there were. In order to solve this problem, it may be possible to provide a muffling device under the crankcase, but this would lead to the inconvenience of raising the engine height.

[Means for solving problems]

The present invention has been made in view of these circumstances, and provides an engine guard that can reduce noise from the bottom of the engine crankcase.

The engine guard according to the present invention has a circumferential wall protruding toward the crankcase on the inner bottom surface, and an elastic material that tightly contacts the bottom surface of the crankcase at the tip of the circumferential wall.

(Function) In the present invention, by providing a partition wall between the bottom surface of the crankcase and the outside using an engine guard,
Blocks noise emitted from the bottom of the crankcase.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an engine guard according to the present invention, and FIG.
The figure is also a perspective view, and FIG. 3 is a side view showing the motorcycle to which the engine guard is attached. In these figures, the reference numeral 1 indicates the engine mounted on the motorcycle 2. This engine 1 is housed in a space formed between a fuel tank 3 and a frame 4, and includes a crankcase 5 to which gears such as a transmission are assembled together with the crankshaft, and a crankcase 5 that extends upward from the crankcase 5. It includes an extending cylinder block 6 that holds a piston, and a cylinder head 7 that closes the upper part of the cylinder block 6 to form a combustion chamber.

Similar to the conventional crankcase, both sides of the crankcase 5 are covered with crankcase covers 8, 8 which are attached via gaskets, and a clutch or generator is installed between the crankcase 5 and the crankcase cover 8.8. It is accommodated. Further, the bottom surface 5a forms an outer wall of the engine 1.

Reference numeral 10 denotes an engine guard that covers the lower side of the crankcase 5 of the engine 1 to protect the engine 1 from obstacles on the road surface or from stones and mud thrown up by the front wheels. This engine guard 10 is made of resin material, aluminum material, etc.
It is formed to extend in the horizontal direction parallel to the bottom surface 5a of the crankcase 5 and upward at the front part, and is attached so as to span between the down tube 4a and the seat pillar tube 4b of the frame 4. It is being

Reference numeral 11 denotes a peripheral wall provided on the inner bottom surface of the engine guard 10 and protruding in the direction of the crankcase 5. This peripheral wall 11 is made of the same material as the engine guard 1o and has a rectangular shape in plan view. 10. The height of the peripheral wall 11 is the bottom surface 5a of the crankcase 5.
The height is set to form the required gap between the

Reference numeral 12 denotes a flange provided at the tip of the peripheral wall 11, and an elastic material 13 that is in close contact with the bottom surface 5a of the crankcase 5 is adhered to the end surface of the flange I2. For example, elastic rubber or sponge rubber can be used as the elastic material 13, and its thickness is set to be thicker than the required gap. Reference numeral 14 denotes a mounting portion for mounting the engine guard 10 to the frame 4, which has a mounting hole through which a mounting bolt passes, and is recessed on the inner bottom side to accommodate the head of the mounting bolt.

In the engine guard configured in this way, when the engine guard 1o is attached to the frame 4 with the mounting bolt, the elastic material 13 is compressively deformed and comes into close contact with the bottom surface 5a of the crankcase 5. A sealed space can be formed below 5. Therefore, by using the engine guard 10 and the peripheral wall 11 as wall members, a partition wall can be provided between the bottom surface 5a of the crankcase 5, which is a noise source, and the outside, through which noise is transmitted.

Therefore, the noise emitted from the bottom surface 5a of the crankcase 5 is not directly transmitted to the outside, but is transmitted to the outside as transmitted sound after being transmitted through the engine guard 10 or the peripheral wall 11 and having its energy attenuated. That is,
The partition wall made up of the engine guard 10 and the peripheral wall 11 can block noise from the bottom surface 5a and provide soundproofing.

In addition, in the above embodiment, an example was described in which the peripheral wall 11 was formed into a rectangular shape in plan view, but the present invention is not limited to this (the shape of the peripheral wall 11 can be changed as appropriate. The peripheral wall 11 may be provided integrally with the engine guard 10, and similar effects can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, a peripheral wall protruding toward the crankcase is provided on the inner bottom surface, and an elastic material that closely contacts the bottom surface of the crankcase is provided at the tip of this peripheral wall.
An engine guard can be used to provide a partition between the bottom of the crankcase and the outside.

Therefore, the noise emitted from the bottom surface of the crankcase can be blocked and prevented from being transmitted to the outside, so that the noise from the bottom surface of the engine crankcase can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an engine guard according to the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a side view showing a motorcycle to which the engine guard is attached. 5... Crank case, 10... Engine guard, 1... Peripheral wall, 13... Elastic material.

Claims (1)

[Claims] An engine guard that includes a circumferential wall that protrudes toward the crankcase on the inner bottom surface of the engine guard that covers the lower side of the engine's crankcase, and an elastic material that tightly contacts the bottom surface of the crankcase at the tip of the circumferential wall.