Importance

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Abstract

A pump discharge flow-rate control device includes a constant capacity pump driven by a common driving source with a variable capacity pump, a resistor interposed in a signal pressure passage through which a working fluid discharged from the constant capacity pump flows, and a control pressure actuator configured to lower the control pressure by driving the regulator in accordance with a rise in a differential pressure before and after the resistor. The resistor includes a fixed throttle and a check valve interposed in the signal pressure passage in parallel with each other. The check valve includes a seat interposed in the signal pressure passage, a poppet arranged on a downstream side of the seat, and a spring configured to press the poppet to the seat.

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First Claim