| 摘要 |
An oil pump has a pump body (A), an outer rotor (91), and an inner rotor (92). The pump body (A) includes a rotor chamber 11), an inlet port (14) and an outlet port (15) formed in the rotor chamber (11), an inlet passage (14a) communicating with the inlet port (14), an outlet passage (15a) communicating with the outlet port (15), a relief valve (2), a relief chamber (18) formed on a discharge side of the relief valve (2), and an oil return passage (3) formed from the relief chamber (18) to the inlet passage (14). The outer rotor (91) is supported by the inner circumferential support wall (11a) of the rotor chamber. The oil return passage (3) is formed in the inner circumferential support wall (11a) as a groove-like recess and opens along an outer circumferential surface of the outer rotor (91). |
