Vane pump with annular aetainer limiting outward radial vane movement

摘要

A vane pump in which between an end surface of a rotor and an inner surface of an end wall of a housing having the rotor supported in an eccentric state is interposed a retainer coaxial with the housing or a bearing, and the retainer or bearing is engaged with vanes to define the pratrusion of the vaned to a given amount, and an inner peripheral surface of the housing is formed correspondingly to the end edges of the vanes which rotates while being subjected to said defining to make a clearance therebetween constant.