Combined hydrostatic transmission implement system
AssigneeCaterpillar Tractor Co.
InventorWilliam B. Norick
Life of this patent
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Abstract
A hydraulic system is disclosed which combines hydrostatic and implement motors and includes a plurality of hydraulic motors with a variable displacement pump supplying fluid for the motors and a plurality of directional control valves for selectively directing fluid from the pump to the respective motors and includes pressure varying means connected to each of the directional control valves for varying a pilot pressure communicated to vary the displacement of the variable displacement pump in direct relationship to the shifting of the directional control valves.
Claims14
A hydraulic system comprising a plurality of hydraulic motors, a variable displacement pump for supplying pressurized fluid for operation of said motors and a plurality of directional control valves for selectively directing pressurized fluid from said variable displacement pump to said hydraulic motors, the improvement comprising:
- pressure responsive variable displacement means for varying the displacement of said pump;
- a source of pressurized fluid communicating with said variable displacement means;
- and,
- pressure varying means connected to at least one of said directional control valves for varying the pressure of said source of pressurized fluid in response to movement of said one of said directional control valves for varying the displacement of said variable displacement pump, wherein said pressure varying means comprising separate and discrete throttling means for variably restricting the flow of said fluid via said conduit means to said sump.
Dependencies are inferred from the claim text.