A joint structure with decoupling effect

Abstract

The invention relates to a joint structure with decoupling function, which comprises a plane flange, a sealing ring, a bolt, a pressure spring, a nut and a spherical concave flange. The flat flange and spherical concave flange are respectively connected to the pipeline or device to be connected by welding, and the pipeline or device connected to the flat flange protrudes out of the flat flange for a small section, and the sealing ring is sleeved on this small section. The inner surface of the sealing ring cooperates with this small section to position and guide the sealing ring; the sealing ring is arranged between the flat flange and the spherical concave flange, and the side facing the spherical concave flange is a spherical surface, and the spherical surface Cooperate with the spherical concave surface of the spherical concave flange to form a sealing surface; the flat flange and the spherical concave flange are connected by bolts. By designing the decoupling structure in the joint, the present invention can effectively isolate the bending and torsional vibration of the motor vehicle exhaust system. The structure has low material requirements and the cost is much lower than that of the decoupling structure using bellows .

Description

technical field [0001] The present invention relates to a joint structure, in particular to a joint structure in an engine exhaust system of a motor vehicle. Background technique [0002] According to the temperature, the exhaust system of a motor vehicle engine can be divided into a hot end and a cold end. The part closest to the engine is the hot end, which generally includes the exhaust manifold and catalytic converter. The cold end includes the front muffler, rear muffler, intermediate pipe and tailpipe, etc. In general, at the boundary point between the hot end and the cold end of the exhaust system, a corresponding decoupling structure needs to be designed to reduce the bending and torsional vibration of the exhaust system and improve the NVH level of the motor vehicle. [0003] Existing motor vehicles generally use bellows decoupling, and the price of bellows is relatively high. In order to reduce the cost of the whole vehicle and meet the NVH performance of the exh...

AI Technical Summary

Problems solved by technology

[0003] Existing motor vehicles generally use bellows decoupling, and the price of bellows is high. In order to reduce the cost of the whole vehicle and meet the NVH performance of the exhaust system at the same time, a low-cost motor vehicle exhaust system decoupling device is urgently needed

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