Importance

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Abstract

A pump chamber defines a capacity increased in a first certain angle range and decreased in a second certain angle range. An intake port is open in an increase range where the pump chamber moves from a minimum capacity position to a maximum capacity position. A discharge port is open in a decrease range where the pump chamber moves from the maximum capacity position to the minimum capacity position, the discharge port being biased to the minimum capacity position. A seal land portion seals a communication between the intake port and the discharge port via the pump chamber. A reduced portion is defined between a communication portion and the pump chamber. A bypass path connects the communication portion with the discharge port. A relief valve intervened in the bypass path opens the bypass path with a pressure of the communication portion increased to or over a set pressure.

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First Claim