A three-degree-of-freedom thermal fatigue testing machine for metal bellows of automobile exhaust system

Abstract

The invention discloses a three-degree-of-freedom thermal fatigue testing machine for a metal corrugated pipe of an automobile exhaust system and belongs to the automobile part performance testing field. The testing machine is composed of two major modules, namely, a mechanical structure module and an electric control system module, wherein the mechanical structure module includes a driving part, a transmission mechanism and a clamping mechanism, and the electric control system module includes a measurement and control interface, an industrial personal computer and an electric motor controller. When the testing machine works, a user can set the movement direction and frequency of the corrugated pipe through the measurement and control interface; the industrial personal computer outputs a control command to the driving system, so that the thermal fatigue testing machine can be controlled to perform a thermal fatigue test according to an operating condition set by the measurement and control interface; the industrial personal computer acquires actual movement state parameters of the thermal fatigue test; and the actual movement state parameters are displayed on the measurement and control interface. With the three-degree-of-freedom thermal fatigue testing machine of the invention adopted, independent movement of a transverse direction, a longitudinal direction and a vertical direction of the metal corrugated pipe of the automobile exhaust system can be realized, and at the same time, combined movement of two directions or three directions can be realized, and the real automobile operating state of the corrugated pipe can be simulated.

Description

technical field [0001] The invention relates to a thermal fatigue testing machine applied to the metal bellows of the automobile exhaust system, more specifically, it relates to a kind of independent and combined Motion thermal fatigue testing machine. 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 humidity, strong vibration, corrosion, and strong airflow. Metal bellows When ...

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

Images