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US 4,056,989 AGranted
Vehicle drive
AssigneeCaterpillar Tractor Co.
InventorWalter M. Shaffer
Life of this patent
Estimating the term…
Abstract
A drive system for a vehicle includes a fluid pump which drives a fluid motor which in turn drives a variable speed transmission of the type including an input toroidal disc, an output toroidal disc, and wheel means rollingly connecting the input and output discs, with the output disc being used to drive the vehicle.
Claims4
A drive system for a vehicle or the like comprising:
- a fluid pump;
- means for driving said fluid pump;
- a fluid motor;
- means operatively connecting said fluid pump and fluid motor so that driving of said fluid pump drives said fluid motor;
- and
- a variable speed transmission having an infinite number of ratios operatively coupled with said motor, wherein the variable speed transmission comprises an input disc driven by said motor, an output disc, and wheel means rollingly interconnecting the input disc and output disc, with the wheel means being variable in position relative to the input disc and output disc to vary the speed of the output disc in relation to the speed of the input disc, and means for varying the position of the wheel means relative to the input and the output discs to in turn vary the speed of the output disc in relation to the speed of the input disc, wherein the means varying the position of the wheel means comprise means operatively coupled with said wheel means and responsive to fluid pressure in said means operatively coupling said fluid pump and fluid motor.
3 more elements
Dependencies are inferred from the claim text.