Pump/motor control mechanism

Details Pump/motor control mechanism Pump/motor control mechanism

1990-04-25

1992-08-18

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91368, 91497, F15B 910, F01B 106

Patent

active

051389320

ABSTRACT:
A pump/motor control mechanism comprising a first actuator for actuating forward a forward/backward member when a fluid pressure is introduced into a first cylinder chamber located in the forward/backward member, a second actuator for actuating backward the forward/backward member when a fluid pressure is introduced into a second cylinder chamber located in the forward/backward member at a position oppositely facing the first actuator, a spool holding hole which is provided in the forward/backward member and has an axis center parallel to the forward/backward direction, a spool which is slidable fitted in the spool holding hole and has on its outer periphery a high-pressure groove connected to a high-pressure fluid source and a low-pressure groove opened to a low-pressure zone, input means for driving forward or backward the spool, a first pressure introducing path whose one end is connected to the first cylinder chamber and whose other end is opened to an area which is on the inner periphery of the spool holding hole and connected to the high-pressure groove when the spool moves forward and to the low-pressure groove when the spool moves backward, and a second pressure introducing path whose one end is connected to the second cylinder chamber and whose other end is opened to an area which is on the inner periphery of the spool holding hole and connected to the high-pressure groove when the spool moves backward and to the low-pressure groove when the spool moves forward.

REFERENCES:
patent: 2718877 (1955-09-01), Rishel et al.
patent: 2939653 (1960-06-01), Rasmussen et al.
patent: 3020890 (1962-02-01), Grad
patent: 3026854 (1962-03-01), Wiedmann et al.
patent: 3216454 (1965-11-01), Richter et al.
patent: 4770081 (1988-09-01), Kita

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