VARIABLE PUMP

摘要

This variable oil pump is provided with: a pump rotor accommodated within a housing and rotationally driven; a regulation ring which, while rotatably holding the pump rotor from the outer peripheral side, is displaced by hydraulic pressure supplied to a hydraulic chamber between the housing and the pump rotor, thereby adjusting the amount of oil discharged from the pump rotor; and a vane provided at the position where the regulation ring and the housing face each other and preventing oil from leaking to the outside of the hydraulic chamber. The regulation ring includes: a vane holding section for holding the vane; and an oil passage for introducing hydraulic pressure within the hydraulic chamber into vane holding section.