Overspeed control for hydrostatic drives on tractors

Details Overspeed control for hydrostatic drives on tractors Overspeed control for hydrostatic drives on tractors

B - Operations, Transporting

60

K

B60K 17/10 (2006.01) B60K 17/356 (2006.01) B60K 31/00 (2006.01) F16H 61/46 (2006.01)

Patent

CA 2288410

A system is provided for lubricating and cooling a remote drop box for a hydrostatically driven four wheel drive tractor. The hydrostatic motor is operated very close to its maximum rated operating speed during roading in order to maximize drawbar pull and road speed capability for a variable hydrostatic motor, leaving very little margin for overspeeding that occurs when the tractor is roading downhill. An electronic overspeed control is provided to provide dynamic engine braking. When the hydrostatic drive is used with a high torque engine, the available charge pump flow drops as the engine speed drops, and eventually reaches a point where the required servo pressure to maintain the hydraulic pump in stroke cannot be maintained. Such a condition is alleviated by the supplemental charge flow system. Stabilization of the load sensing hydraulic system, which is subject to rhythmic flow pulsations or surging, particularly when flow compensators in valuing interact with the flow compensator of the hydraulic pump, is accomplished with an attenuator/hose assembly.

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