ABSTRACT

Valve train is one of the most important components of internal combustion engine. Design of valve train aects its economic performance, vibration, noise and working reliability directly. The main function of valve train is to make fresh and combustible mixture enter into the cylinder timely, thus the exhaust gas can be removed in accordance with the requirements of valve timing. Valve train mainly contains camshaft, valve tappet, rocker arm, push rod and valve spring.