Torque equalizer for a hydraulically driven four-wheel-drive...

Details Torque equalizer for a hydraulically driven four-wheel-drive... Torque equalizer for a hydraulically driven four-wheel-drive...

B - Operations, Transporting

60

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180/39

B60K 17/02 (2006.01) B60K 17/10 (2006.01) B60K 17/34 (2006.01) B60K 17/356 (2006.01)

Patent

CA 1080127

Torque Equalizer for a Hydraulically Driven, Four-Wheel-Drive Vehicle Abstract of the Disclosure A two-axle, four-wheel-drive vehicle has separate hydraulic drive systems to drive the front and rear pairs of traction wheels. Each drive system includes a hydraulic motor that is powered by its own variable displacement pump. The torque developed by the motors, and the hydrostatic drive pressure, depend on the volume of fluid flow from the pumps. Under certain conditions, the hydrostatic drive pressure to the two motors becomes unbalanced. A torque equalizer valve is interconnected between the two hydraulic drive systems. When the equalizer valve senses a hydrostatic drive pressure difference be- tween the two drive systems, it readjusts the displacement of the pump having the higher pressure by lowering the hydrostatic pilot pressure to restore the balance of hydrostatic drive pressures.

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