Valve timing adjusting device

摘要

A valve timing adjusting device, in which the housing member including a chain sprocket and a shoe housing, and a vane rotor are relatively rotatable. The inner surfaces on both axial sides of the housing member and the outside surfaces on both axial sides of the vane rotor slide each other. A retard oil passage communicating with each retard hydraulic chamber is formed in an outside surface of the vane rotor on the side to which a hydraulic fluid is supplied through an oil passage formed in a camshaft. Furthermore, an advance oil passage communicating with each advance hydraulic chamber is formed at an interval of about 90 degrees at the center of an inner surface of the chain sprocket on the side to which the hydraulic fluid is supplied through a groove oil passage formed in the camshaft.