Two-degree freedom thermal fatigue test device used for metal bellows of vehicle exhaust system

Abstract

The invention discloses a two-degree freedom thermal fatigue test device used for a metal bellows of a vehicle exhaust system, belonging to the field of performance test of auto parts. The device comprises three parts: a driving part, a transmission part and a clamping part, wherein the driving part consists of two motors that are respectively used for controlling the radial movement and the axial movement of the metal bellows. While the device realizes independent radial/axial movement of the metal bellows, the combination of the radial movement and the axial movement of the metal bellows can be realized. The connection manner of the overall structure is described as follows: one end of the metal bellows is completely fixed by the clamping mechanism, and the other end of the metal bellows is fixed on a vibrating mechanism. The radial driving motor and the axial driving motor are fixed under a test bed; a coupler is used for driving an eccentric rotating mechanism to drive a sliding groove connecting rod to move along a polished rod, so as to realize the movement of the metal bellows.

Description

technical field [0001] The invention relates to a test device for two-degree-of-freedom thermal fatigue testing of metal bellows of automobile exhaust system, more specifically, it relates to a thermal device capable of realizing radial and axial independent and combined movements of automobile metal bellows Fatigue test device. Background technique [0002] The metal bellows connect the hot and cold ends of the automobile exhaust system, which can effectively reduce the vibration and impact of the exhaust system caused or transmitted by the engine, body and ground, etc., and reduce the exhaust system caused by the relative displacement of the engine and the exhaust system. Even the vibration of the whole vehicle plays an important role in the vibration reduction and noise reduction of the automobile exhaust system. A car is a harsh, changeable environment and a moving object under load. The car exhaust system is in an extremely harsh environment of high temperature, high h...

AI Technical Summary

Problems solved by technology

The vibration frequency and amplitude of the existing bellows thermal fatigue test mechanism are mostly fixed, which cannot truly reflect the movement of the bellows during the operation of the car. If the movement amplitude of the bellows is changed, the cam or eccentric shaft mechanism needs to be redesigned , increasing the design cost and test cycle

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