Pressure responsive hydraulic control circuit

Details Pressure responsive hydraulic control circuit Pressure responsive hydraulic control circuit

1987-08-24

1988-07-19

Michalsky, Gerald A.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91436, 1375962, F15B 1304

Patent

active

047576855

ABSTRACT:
Backhoes are useful for digging trenches, ditches, etc. However, a performance deficiency caused by the formation of voids in the hydraulic control motor occurs sometimes if the swinging mass of the backhoe is abruptly stopped by quickly moving the directional control valve to the neutral position. The present invention provides a control circuit having a charging valve for communicating pressurized fluid from the supply conduit connected to the pump to charge the makeup valves with pump discharge fluid to minimize or avoid the formation of voids when the directional control valve is moved to the neutral position to stop the swinging movement of the backhoe mechanism.

REFERENCES:
patent: 3601504 (1971-08-01), McBurnett
patent: 3722543 (1973-03-01), Tennis
patent: 3908843 (1975-09-01), Noller
patent: 4007845 (1977-02-01), Worback
patent: 4344733 (1982-08-01), Hirsch
patent: 4354351 (1982-10-01), Dezelan
Rexroth-Directional Control Valve MP-18 (30 Series)- Issue Date: 4/80.

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