Mitsubishi Heavy Industries Limited

Kenta Kawasaki

Atsushi Kakino

Hiroshi Saito

Takashi Oka

Takashi Miura

Ports (and) are formed in a port plate (). A plurality of valve plate holes are arranged on a circumference around the rotation axis (S). The port plate () includes a plurality of bridges () configured to divide the port () into a circumferential direction to provide a plurality of port holes (), and a plurality of bridges () configured to divide the port () into the circumferential direction to provide a plurality of port holes (). A summation of the number of port holes () and the number of port holes () is greater than the number of valve plate holes.

Fluid pressure pump

A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder connected with the two fail safe valves and having a piston rod, wherein the piston rod is moved by switching supply and discharge of the fluid; two switching valves connected with the two fail safe valves; two accumulators connected with the two switching valves and the two hydraulic pumps, respectively; and two chambers connected with the two switching valves, respectively. Each of the two accumulators accumulates the fluid from a corresponding one of the two hydraulic pumps, and sends the fluid to a corresponding one of the two fail safe valves. The two chambers receive the fluid from the two fail safe valves, respectively.

Double redundancy electro hydrostatic actuator system

A fluid pressure actuator includes an output cylinder, a fluid pressure pump, an electric motor, a first output cylinder passage, a second output cylinder passage, a return passage and a swash plate control cylinder. The output cylinder includes a first output cylinder chamber, a second output cylinder chamber and an output piston arranged between the first output cylinder chamber and the second output cylinder chamber. The fluid pressure pump includes a first supply and discharge port, a second supply and discharge port and a swash plate for changing displacement of the fluid pressure pump. The electric motor drives the fluid pressure pump. The first output cylinder passage connects the first output cylinder chamber and the first supply and discharge port. The second output cylinder passage connects the second output cylinder chamber and the second supply and discharge port.

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Aichi-ken, Japan

Kenta Kawasaki