| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of an abnormal sound by reducing pulsation of hydraulic pressure by preventing a high pressure hydraulic fluid flowed in a sub-suction port via a control valve from a delivery port from flowing in a main suction port via a pump chamber from the sub-suction port. SOLUTION: A shape B1 of an anti-rotational directional side end part in the main suction port B of an oil pump 20 is formed in the shape of running along a rotational directional side end part shape R1 of the pump chamber R (an oblique line applied part) instantaneously sealed between the sub-suction port A and the main suction port B, and a shape A1 of an inner peripheral side end part in the sub-suction port A is formed in the shape of running along a rotational locus of the anti-rotational directional side end R2 (a contact point of both rotors 22 and 23) of the pump chamber R instantaneously sealed between the sub-suction port A and the main suction port B.
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