Hydrostatic propulsion system and method with inching...

Details Hydrostatic propulsion system and method with inching... Hydrostatic propulsion system and method with inching...

F - Mech Eng,Light,Heat,Weapons

15

B

180/39, 138/41.1

F15B 7/00 (2006.01) B60T 13/58 (2006.01) F16H 61/42 (2006.01)

Patent

CA 1217695

-27- ABSTRACT OF THE DISCLOSURE A hydrostatic propulsion system and method of operation is disclosed for smoothly driving a vehicle, such as a street sweeper. The system includes a shift lever for selectively moving a pump stroking valve into reverse, neutral, low forward, and fast forward speed positions to prepare the system. After the shift lever has been placed in a forward or reverse position, an accelerator pedal must be depressed to partially or fully close an inching throttle valve before the pump swash plate moves from its zero piston displacement position and begins to pump fluid to the hydrostatic motors. Hydrostatic braking forces are applied when the accelerator pedal is released and also in response to initial depression of a brake pedal for providing normal braking to the vehicle. Further depression of the brake pedal operates a conventional brake system for panic stops. Movement into the high forward speed range is accomplished by moving the shift lever into "high" which activates a circuit for shifting the swash plates of the hydrostatic motors into high speed positions.

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