JPH0116965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for an automobile exhaust pipe,
In particular, the present invention relates to a vibration-proof support structure for an exhaust pipe that prevents vibrations from the exhaust pipe from being transmitted to the vehicle body.

Automobile exhaust pipes have an extremely wide range of resonance characteristics due to the fact that they are directly connected to the prime mover, which is the source of vibration, and the characteristics of the shape and support form of the exhaust pipe, and the quality of the vibration isolation is determined by the sound characteristics inside the car. There is a close relationship. For this reason, the exhaust pipe support structure has traditionally been made of rubber rings with excellent vibration isolation properties.
It is used in many car models. This rubber ring connects the vehicle body side bracket fixed to the lower surface of the automobile body and the exhaust pipe side bracket fixed to the exhaust pipe.

However, rubber rings made of resin-based rubber in particular have high spring characteristics at low temperatures, so when starting an engine in cold weather or when the exhaust pipe resonates in cold weather, it is necessary to sufficiently suppress the vibration of the exhaust pipe. As a result, the rubber ring was separated from the vehicle body side bracket and vibrated, and the resulting vibration impact sound between the rubber ring and the vehicle body side bracket became abnormal noise and was sometimes transmitted into the vehicle interior.

The purpose of the present invention is to solve such problems, and to provide an automobile exhaust system that prevents the rubber ring supporting the exhaust pipe from coming loose from the vehicle body side bracket and vibrating, and which does not generate abnormal noise. The purpose is to provide a support structure for the tube.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The drawings show a support structure for an automobile exhaust pipe according to the present invention. The exhaust pipe 1 is supported at several locations on the bottom surface of the vehicle body (body member, bracket, etc.) 2 by such a support structure. The exhaust pipe side support bracket 3 has a lower end 3a fixed to the outer periphery of the exhaust pipe 1 by welding or the like, and extends upward from the exhaust pipe 1, and has an inverted U-shaped mounting part (hook part) 3b at the upper end. be. The vehicle body side support bracket 4 has a leaf spring 5
is fixed to the bottom surface 2 of the body with two sets of bolts 6 and nuts 7. On both sides of the vehicle body side support bracket 4, there are mounting portions 4a which are approximately L-shaped and are spaced downward from the body bottom surface 2.
A stopper rubber 8 is attached to the lower surface of the central portion. The approximately L-shaped mounting portion 4a of the vehicle body side support bracket 4 and the inverted U-shaped mounting portion 3b of the exhaust pipe side support bracket 3 are connected by two rubber rings 9 made of a suitable resin-based rubber. . Body bottom 2 and vehicle side support bracket 4
Both ends of the leaf spring 5, which is held between the two ends, constantly press the rubber ring 9 against the mounting portion 4a of the vehicle body side bracket 4 with an appropriate pressing force.

Since the exhaust pipe 1 is directly connected to the engine (not shown), vibrations from the engine are transmitted to the exhaust pipe 1.
The exhaust pipe 1 vibrates against the bottom surface 2 of the body. This vibration is absorbed by the two rubber rings 9. In the present invention, the rubber ring 9 is always connected to the support bracket 4 on the vehicle body side by the leaf spring 5.
Since the rubber ring 9 is pressed against the mounting portion 4a, even if the exhaust pipe 1 resonates at low temperatures when the rubber ring 9 has high spring characteristics, the rubber ring 9 will not come loose from the vehicle support bracket 4. Therefore, no impact sound is generated when the rubber ring 9 hits the support bracket 4 on the vehicle body side, and no abnormal noise is transmitted into the vehicle interior. The stopper rubber 8 is used to prevent the exhaust pipe side support bracket 3 from hitting the vehicle body side support bracket 4 when the exhaust pipe 1 vibrates up and down. Further, in the present invention, the leaf spring 5 is fixed between the vehicle body side support bracket 4 and the body lower surface 2 by tightening together, so that the leaf spring 5 can be installed at the same time as the vehicle body side support bracket 4 is installed. , and can apply an appropriate pressing force to the rubber ring 9.

[Brief explanation of drawings]

The drawings show an embodiment of a support structure for an automobile exhaust pipe according to the present invention. 1...Exhaust pipe, 2...Bottom surface of the body, 3...Exhaust pipe side support bracket, 4...Vehicle body side support bracket, 5...Leaf spring, 9...Rubber ring.

Claims (1)

[Claims] 1. A vehicle body support bracket 4 having a fixing part fixed to the lower surface 2 of the automobile body and a mounting part 4a extending from the fixing part away from the lower body surface 2, and an exhaust pipe support bracket 3 fixed to the exhaust pipe 1. , a rubber ring 9 for hanging the exhaust pipe 1 by hooking one side on the hook portion 3b of the exhaust pipe side support bracket 3 and hooking the other side on the mounting part 4a of the vehicle body side support bracket; The exhaust pipe for an automobile includes a leaf spring 5 that presses a ring 9 against the mounting part 4a, and the leaf spring is co-tightly fixed between the fixed part of the support bracket 4 on the vehicle body side and the lower surface 2 of the body. supporting structure.