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US 2003/0111048 A1Published application
Electro-hydraulic actuator for a hydraulic pump
AssigneeCaterpillar Inc.
InventorsDennis H. Gibson, Ryan P. Michels
Life of this patent
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AssigneeCaterpillar Inc.
InventorsDennis H. Gibson, Ryan P. Michels
Estimating the term…
A hydraulically-actuated system includes a fix displacement variable delivery pump with a plurality of parallel disposed pistons that reciprocate in a pump housing the defines a high pressure portion and a low pressure area. A control device is attached to the pump housing and moveable between a first position in which the pistons displace fluid into the high pressure portion and a second position in which pistons spill fluid back to the low pressure area. The control device includes an electrically driven linear motion device, a linkage and a plurality of sleeves, one being disposed on each piston. Linear movement of the control device in turn causes linear movement of the sleeves. The position of the sleeves in turn determines the amount of output of the pump.
A variable delivery fixed displacement pump comprising:
A fluid delivery system comprising:
A method for controlling a variable delivery fixed displacement pump comprising the steps of:
The method of claim 14 including the step of having an electronic control module adapted to generate said control signal.
The method of claim 14 including the step of said actuator having a position sensor for sending a signal to said electronic control module, said signal being related to the position of said actuator shaft.
The method of claim 14 including the step of energizing a first solenoid coil, said first solenoid coil being energized and causing said actuator shaft to move toward said first position.
Dependencies are inferred from the claim text.