| 摘要 |
An oil pump apparatus includes an oil pump housing having a first suction port a second suction port and a discharge port in the circumferential direction thereof. A shape of the end portion in the anti-rotational direction at the second suction port is formed so as to be along a shape of the end portion in the rotational direction at the pump chamber which is sealed momentarily between the first suction port and the second suction port, and a shape of the inner circumferential end portion of the first suction port is formed so as to be along the rotational trace of the end portion on the side of the anti-rotational direction at the pump chamber which is sealed momentarily between the first suction port and the second suction port. A plural first pockets are formed on the driven rotor, and a second pocket is formed on the pump housing. The second pocket can be closed at the inner circumferential portion of the pump housing located at inner side with respect to the first suction port by the drive rotor and can communicate each pump chamber to the first suction port through the first pocket when each pump chamber is communicated to the first suction pump.
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