Verbrennungsmotor mit variablem Ventilsteuerungssystem und Motorrad

摘要

Object The invention aims to provide an internal combustion engine equipped with a variable valve controlling system in which the single actuator is disposed in a cylinder head on one side where one ends of the rocker-arm shafts are disposed, while enabling the single actuator to activate the rocker arms irrespective of the arrangement of the rocker-arm shafts. The invention also aims to efficiently arrange the actuator in a motorcycle on which the internal combustion engine is mounted. Solving Means In an internal combustion engine (1), a hydraulic cylinder (66) of a hydraulic actuator (65) is disposed so as to transverse a cam-chain chamber (54). Operation elements (68) extend respectively from sidewalls of a plunger in the hydraulic cylinder (66), and activate respectively rocker-arm shafts (14) and (18). In a motorcycle on which the engine (1) is mounted, a frame member of a vehicle frame is disposed outside the hydraulic actuator (65).