The EGR bellows is a component in the automobile exhaust gas recirculation (EGR) system. It is made of high temperature resistant and corrosion resistant metal materials with good flexibility and fatigue resistance. Its main functions are:

1. Vibration buffering: The engine generates vibration when it is working, and the EGR bellows can buffer it to avoid problems such as loose connection and rupture of the EGR pipeline due to vibration, and ensure the stability of the system connection.

2. Compensation for thermal expansion and contraction: The temperature of the EGR system changes greatly when it is working. The bellows can compensate for the expansion and contraction of the pipeline caused by temperature changes and prevent the pipeline from being damaged by thermal stress.

3. Ensure smooth exhaust gas circulation: Maintain the normal exhaust gas flow channel in the EGR system, so that the exhaust gas can flow back from the exhaust system to the intake system according to the design requirements, participate in the combustion process, help reduce nitrogen oxide emissions, and improve engine combustion efficiency and environmental protection performance.