Fluid system with flow compensated torque control
AssigneeCaterpillar Tractor Co.
InventorsKenneth R. Lohbauer, Paul C. Moots
Life of this patent
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Abstract
A fluid control system (10) for controlling the torque of a fluid motor (22) and varying the flow to the fluid motor (22) has a mechanism (56) to control the torque and flow in proportion to the operator's input to a pilot operated control valve (16) that controls the fluid motor (22). The mechanism (56) controls the torque and flow of the fluid motor (22) during both acceleration and deceleration of the fluid motor (22). The fluid control system eliminates the need for special, complicated control valves.
Claims20
In a fluid control system (10) having a pump (12), a tank (14) connected to the pump (12), a fluid motor (22), a pilot operated control valve (16) having a neutral and an operative position and a load sensing port (28), the pilot operated control valve (16) being in fluid communication with the pump (12) and the fluid motor (22), first means (44) for varying the output flow and pressure from the pump (12) to the fluid motor (22) in response to a load signal received through the load sensing port (28) with the control valve (16) at the operative position, a source (40) of pressurized pilot fluid and a pilot valve (34) in fluid communication with the source (40) and adapted to controllably communicate the pressurized pilot fluid to an end (30, 32) of the control valve (16) for moving the control valve (16) to the operative position, the improvement comprising:
- second means (56) for both varying the output flow and pressure from the pump (12) to the fluid motor (22) and controlling the torque of the fluid motor (22) in proportion to the controlled pressurized pilot fluid communicated to the end (30, 32) of the control valve (16), said second means being operatively connected to said controlled pressurized pilot fluid communicated to the end (30, 32) of the control valve (16).
Dependencies are inferred from the claim text.