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公开(公告)号：US20190136851A1
公开(公告)日：2019-05-09
申请号：US16307353
申请日：2017-05-23
Applicant: KYB Corporation
Inventor： Yuki SAKAI
Abstract: A pump device includes a tilting actuator for controlling a tilting angle of a swash plate in a variable capacity first pump, a regulator for adjusting a control pressure in accordance with a front-rear differential pressure of a control valve, and a control actuator for driving the regulator in accordance with a front-rear differential pressure of a resistor to which the working oil discharged from a fixed capacity second pump is led, and in the control actuator, a pressure receiving area of a control piston on which an auxiliary pressure against an upstream pressure of the resistor acts is set so that an auxiliary driving force corresponds to a lowered amount of a differential-pressure driving force with switching of a rotation speed of a drive source from a first rotation speed to a second rotation speed.
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公开(公告)号：US20190301445A1
公开(公告)日：2019-10-03
申请号：US16307275
申请日：2017-05-23
Applicant: KYB Corporation
Inventor： Yuki SAKAI , Tetsuya IWANAJI
Abstract: A pump device includes a variable capacity first pump, a tilt actuator that controls a tilt angle of a swash plate of the first pump in accordance with the control pressure, a regulator that regulates the control pressure in accordance with a front-rear differential pressure of a control valve, a fixed capacity second pump driven by the same drive source as the first pump, the control actuator that operates in accordance with the front-rear differential pressure a resistor so as to drive the regulator to reduce the control pressure in response to an increase in the front-rear differential pressure of the resistor, an auxiliary passage that leads an auxiliary pressure to the control actuator, the auxiliary pressure acting on the control actuator against a upstream pressure of the resistor, and a switch valve that switches between connecting and shutoff the auxiliary passage.
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