Hydraulic power boost system for a work vehicle
AssigneeCASE CORPORATION, a Delaware Corporation
InventorRoger D. Mickelson
Life of this patent
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Abstract
A backhoe hydraulic system includes a first source of hydraulic fluid, a tank or reservoir, a boom lift cylinder, and a directional control valve that controls fluid flow between the boom swing cylinder and the tank and reservoir. The system also includes a second source of hydraulic fluid (at a higher pressure than the first source) that is connected to one port of the boom lift cylinder via a separate boost valve.
Claims12
A hydraulic system for operating an implement coupled to a work vehicle, the system comprising:
- a first hydraulic fluid source configured to generate a flow of hydraulic fluid at a first pressure;
- a second hydraulic fluid source configured to generate a flow of hydraulic fluid at a second pressure equal to or greater than the first pressure;
- a hydraulic fluid reservoir;
- a plurality of hydraulic cylinders coupled to the implement to move the implement;
- and
- a valve manifold including a plurality of hydraulic valves configured to control the flow of fluid to the plurality of hydraulic cylinders, the manifold defining a pressurized hydraulic fluid supply conduit, a low pressure hydraulic fluid return conduit and an open center conduit that is closed by actuation of the plurality of hydraulic valves, wherein the first fluid source is coupled to the manifold to provide hydraulic fluid under pressure to each of the plurality of valves and through the valves to each of the plurality of hydraulic cylinders and wherein the second fluid source is directly coupled to at least one of the plurality of cylinders to supply fluid directly to the at least one cylinder.
A hydraulic system for a backhoe, comprising:
- a first hydraulic fluid source configured to generate a flow of hydraulic fluid at a first pressure;
- a second hydraulic fluid source configured to generate a flow of hydraulic fluid at a second pressure higher than the first pressure;
- a hydraulic fluid reservoir;
- at least one boom swing cylinder, a boom lift cylinder, a dipper cylinder, and a bucket cylinder;
- a valve array including a boom swing cylinder valve, a boom lift cylinder valve, a dipper cylinder valve, and a bucket cylinder valve, in fluid communication with the at least one boom swing cylinder, the boom lift cylinder, the dipper cylinder, and the bucket cylinder, wherein each of the valves in the valve array are in fluid communication with the first fluid source and are disposed to regulate a flow of fluid from the first fluid source to their respective cylinders, and wherein the second fluid source is directly coupled to the boom lift cylinder;
- and
- a pressure boost valve in fluid communication with the boom lift cylinder and the second fluid source and configured to provide fluid flow from the second fluid source to the boom lift cylinder when the boom lift cylinder valve is opened.
A method of moving a dual-ported hydraulic cylinder of a work vehicle, wherein the work vehicle includes a first hydraulic source of fluid at a first pressure, a directional control valve coupled to the first source to direct a flow of hydraulic fluid at the first pressure from the first source to both of the dual ports, and a hydraulic reservoir coupled to the directional control valve to receive an exhaust flow of hydraulic fluid from the dual ports and to transmit the exhaust flow to the reservoir, and a second hydraulic source at a second pressure greater than the first pressure that is selectively coupled directly to one of the dual ports of the hydraulic cylinder, the method comprising the steps of:
- communicating hydraulic fluid from the second source directly to a first port of the hydraulic cylinder;
- and
- regulating the motion of the hydraulic cylinder by throttling the exhaust flow from a second port of the hydraulic cylinder in and through the directional control valve to the reservoir.
Dependencies are inferred from the claim text.