Hydraulic control system

B - Operations – Transporting – 62 – D

Patent

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138/72

B62D 11/10 (2006.01) B62D 11/18 (2006.01)

Patent

CA 1263288

ABSTRACT OF THE DISCLOSURE: A hydraulic control system for changing the speed and direction of a hydraulically operated tracked vehicle, with a feed pump for the control fluid and with hydraulic undercarriage pumps having regulating cylinders subjected to the control fluid and intended for adjusting the pump pivoting angle. Each of the regulating cylinders is equipped with two regulating-cylinder chambers separated from one another by a regulating piston. For the change of speed there is a first proportional valve connected to the regulating-cylinder chambers, and furhtermore for the change of direction a second proportional valve is connected to respective two oppositely acting regulating-cylinder chambers. The regulating-cylinder chambers are connected independently via change-over valves to the first proportional valve and to the second proportional valve respectively. The drive pressure of the control fluid behind the first proportional valve is always lower than the control pressure of the control fluid in front of the second proportional valve.

525085

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