VALVE ACTUATOR FOR INTERNAL COMBUSTION ENGINE

摘要

Provided is a valve actuator for an internal combustion engine. The valve actuator comprises a biasing means for biasing a transmission member that transmits the actuating force of a cam to a valve. A support part of the biasing means can be manufactured more easily, and increases in the mass of the internal combustion engine can be restricted by using the valve actuator. The valve actuator comprises a first rocker arm (18), which is disposed between a main cam (14) and a valve (26), for transmitting the actuating force of the main cam (14) to the valve (26). The valve actuator comprises a lost motion mechanism (60) for biasing the first rocker arm (18) in one direction. The valve actuator comprises a holding member (68) for holding the lost motion mechanism (60). The lost motion mechanism (60) is fitted to a spark plug tube (66) with the holding member (68) interposed.