Fluid system for two hydraulic circuits having a common source of pressurized fluid
AssigneeCaterpillar Inc.
InventorDavid P. Smith
Life of this patent
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Abstract
A fluid system having a common source of pressurized fluid is provided to selectively control the speed and/or pressure of a first hydraulic circuit while also providing flow/pressure priority to a second hydraulic circuit. The first hydraulic circuit includes a first electrically controlled proportional relief valve connected between the source of pressurized fluid and a first fluid actuator and a second electrically controlled proportional relief valve connected between the reservoir and a point downstream of the first electrically controlled proportional relief valve. The second hydraulic circuit is connected to the source of pressurized fluid in parallel with the first hydraulic circuit.
Claims11
A fluid system for two hydraulic circuits having a common source of pressurized fluid, the fluid system comprising:
- a reservoir operatively connected to the source of pressurized fluid;
- a source of power drivingly connected to the source of pressurized fluid;
- a first hydraulic circuit connected to the source of pressurized fluid and the reservoir, the first hydraulic circuit includes a first fluid actuator connected between the source of pressurized fluid and the reservoir, a first electrically controlled proportional relief valve connected between the source of pressurized fluid and the fluid actuator, and a second electrically controlled proportional relief valve connected between the reservoir and a point between the first electrically controlled proportional relief valve and the fluid actuator;
- a second hydraulic circuit connected in parallel to the source of pressurized fluid, the second hydraulic circuit includes a second fluid actuator connected to the source of pressurized fluid and a control valve operatively disposed between the source of pressurized fluid and the fluid actuator.
Dependencies are inferred from the claim text.