Woodcock Washburn LLP
Variable displacement rotary pump
A variable displacement rotary pump includes a main pump unit, an auxiliary pump unit, a discharge passage, a bypass passage, a suction passage, a check valve and a control valve. The suction passage is in communication with the discharge passage through the bypass passage and a second discharge port. The check valve is disposed in the discharge passage for preventing fluid in a first discharge port of the main pump unit from flowing into the bypass passage. The control valve is operable for opening and closing the bypass passage. When the control valve opens the bypass passage and the check valve closes the discharge passage, flow rate of the fluid discharged from the discharge passage is reduced. A throttle passage is provided in the bypass passage or the control valve for regulating flow of the fluid in early phase of operation of the control valve to open the bypass passage.
Kabushiki Kaisha Toyota Jidoshokki
F F F F F
F04C F04C F04C F04C F04C
inventional inventional inventional additional inventional
Hironao Katsumi Toshiro Shigeru
Yokoi Yamashita Fujii Suzuki