Patent ID: 8863709

Claim:
A valve timing adjuster mounted to a driving force transmission system, wherein the driving force transmission system transmits a driving force through a timing belt from a drive shaft to a driven shaft that opens and closes at least one of an intake valve and an exhaust valve, the timing belt being rotatable synchronously with rotation of the drive shaft, the valve timing adjuster comprising: a pulley part that is rotatable synchronously with the drive shaft through engagement with the timing belt; a housing formed integrally with the pulley part; a vane rotor that is received within the housing; a rear plate facing an opening of the housing and contacting an end surface of the housing, wherein: the vane rotor is rotatable synchronously with the driven shaft; and the vane rotor has a plurality of vane parts that is rotatable relative to the housing within a predetermined angular range; the pulley part is made of a resin; the housing is insert-molded into the pulley part such that the pulley part is formed integrally with the housing; the rear plate and the housing are made of a metal; the rear plate is fastened to the housing through a threaded member; the housing has a cup shape with a bottom; and the pulley part covers an outer circumference of the housing.