Reverse drive oil pump

摘要

The pump includes a shaft having a rotational axis and including a first portion, an overhung portion extending from the first portion and oil distribution member. There is a pump housing and bearing member having a continuous bore receiving the first portion in a bearing relationship, and annular eccentric rotor located in the continuous bore and receiving the overhung portion which extends through the rotor. There is a driving member connecting the rotor and the overhung portion in a driving relationship such that a limited amount of relative rotational movement is permitted between a first position when the shaft is rotating about its rotational axis in a first direction and a second position when the shaft is rotating about its rotational axis in a second direction. There are a pair of circumferentially spaced radially extending bores in the pump housing, and a pair of vanes located in the radially extending bores and in biased contact with the rotor. The rotor, the pair of vanes and the continuous bore coact to define a pair of trapped volumes. The shaft and the rotor have members for supplying oil from the oil supply to the trapped volumes during a suction stroke and for supplying oil from the trapped volumes to the oil distribution member during a discharge stroke whether the shaft is rotating about its rotational axis in either the first or second direction.