| 摘要 |
An outer rotor (5a) and an inner rotor (5b) are formed of sintered aluminum alloy. The sintered aluminum alloy contains 0.5 wt% to 11 wt% of aluminum nitride. Porosity of the sintered aluminum alloy for outer rotor (5a) is 3 vol% to 15 vol%. Porosity of the sintered aluminum alloy for inner rotor (5b) is 2 vol% to 10 vol%. Outer rotor (5a) and inner rotor (5b) are set in a pump case (5c). A rotary driving shaft (6) formed of steel is inserted to a through hole of inner rotor (5b). A press fit member (8) is inserted at a press fit surface of inner rotor (5b) and rotary driving shaft (6). Accordingly, sliding members formed of sintered aluminum alloy which reduces seizure and abrasive wear of the inner and outer rotors can be provided, and in addition, an oil pump of which wear and damage at the inner rotor inner diameter surface is suppressed, can be provided. <IMAGE> |
