Hydraulic drive system

Details Hydraulic drive system Hydraulic drive system

1996-03-28

1997-10-28

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60452, 60468, 60494, F16D 3102

Patent

active

056807600

ABSTRACT:
A hydraulic drive system for a construction machine includes a pump for delivering fluid under pressure from a fluid reservoir, at least one hydraulic actuator selectively driven by the pressurized fluid, and at least one closed-center directional control valve connected in parallel to the pump. The control valve has an "off" position which blocks fluid flow therethrough and at least one "on" position for controlling the flow of fluid to the hydraulic actuator. A control device generates a signal for actuation of the hydraulic actuator. A control unit receives the control device signal for operating the control valve associated with the hydraulic actuator. A bypass line leads from the pump back to the reservoir. A variable position bypass valve is interposed in the bypass line and controls flow through the bypass line. The control unit modulates the bypass valve for optimum operation. A hybrid control senses pressure in the actuator and modifies the control signal in response to the load pressure.

REFERENCES:
patent: 5129230 (1992-07-01), Izumi et al.
patent: 5297381 (1994-03-01), Eich et al.
patent: 5394697 (1995-03-01), Hirata
patent: 5537819 (1996-07-01), Kobayashi

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