VALVE GEAR FOR INTERNAL COMBUSTION ENGINE

摘要

A valve gear (100) opens and closes the valve (2) of an internal combustion engine by driving the valve in the axial direction of the valve stem. A swing cam (10), which swings around a swing shaft (21c) in synchronism with the rotation of the internal combustion engine, comprises a drive cam part (11) and a lift restricting cam part (12). A cam follower (41) slidingly contacts with the drive cam part (11), and lifts the valve by converting the swinging motion of the swing cam (10) into the axial motion of the valve stem. Since a restricting member (42) formed integrally with a swing arm (40) together with the cam follower (41) prevents the cam follower (41) from its separating from the drive cam part (11) in cooperation with the lift restricting cam part (12), the valve is prevented from being disorderly moved irrespective of the swinging acceleration of the swing cam (10).