OIL PUMP

摘要

An oil pump has a pump body, a pump cover, an outer rotor, and an inner rotor. The pump body includes a rotor chamber, a first inlet port, a first outlet port, a first inlet passage, a first outlet passage, a relief valve, a relief chamber formed on a discharge side of the relief valve, and a first oil return passage formed from the relief chamber to the first inlet passage. The pump cover has a second oil return passage. The first oil return passage is formed in an inner circumferential support wall of the rotor chamber as a groove-like recess and opens along an outer circumferential surface of the outer rotor. A support protrusion is formed near a portion where the second oil return passage is formed to support a front surface, in a radial direction, of the outer rotor.

主权项

1. An oil pump, comprising:
a pump body; a pump cover; an outer rotor; and an inner rotor, the pump body comprising a rotor chamber having an inner circumferential support wall on an inner circumferential side, a first inlet port and a first outlet port formed in the rotor chamber, an inlet passage communicating with the first inlet port, an outlet passage communicating with the first outlet port, a relief valve allowing oil to flow from the outlet passage to the inlet passage by relieving pressure, a relief chamber formed on a discharge side of the relief valve, and a first oil return passage formed from the relief chamber to the inlet passage; the pump cover including a second inlet port and a second outlet port, and a second oil return passage facing and communicating with the first oil return passage; the outer rotor being supported by the inner circumferential support wall of the rotor chamber; and the inner rotor being arranged on an inner circumferential side of the outer rotor, wherein the first oil return passage is formed in the inner circumferential support wall as a groove-like recess that opens along an outer circumferential surface of the outer rotor, and a support protrusion is formed near a portion where the second oil return passage is formed in the pump cover to support a front surface, in a radial direction, of the outer rotor.