Positive traction hydraulic drive system

Details Positive traction hydraulic drive system Positive traction hydraulic drive system

2006-09-05

2006-09-05

Ellis, Christopher P. (Department: 3618)

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

C180S308000, C060S701000

Reexamination Certificate

active

07100732

ABSTRACT:
A hydraulic drive system includes a pair of hydraulic drive motors connected in series. Each motor includes a hydraulic circuit with a spring-biased directional control valve and a pair of check valves. The circuits are located in the end cover for each motor, and are in fluid communication with the respective motor and with each other. The circuits are responsive to the pressure differential across the motors, due to the load and direction of the vehicle, and direct flow to one wheel or the other. Flow is directed to the inside motor when accelerating and/or climbing, while the outside motor is allowed to turn freely to compensate for the different turning radius. This reverses when the vehicle is going downhill and/or decelerating, when the motors are braking. If the drive wheel loses traction, the flow and pressure shifts to the other wheel (or to both wheels), until traction is regained.

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