B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
74/167
B60T 13/12 (2006.01) F16D 48/02 (2006.01) F16H 61/02 (2006.01) F16H 61/06 (2006.01) F16H 59/08 (2006.01) F16H 61/684 (2006.01)
Patent
CA 1221559
ABSTRACT A system for controlling the pressure of hydraulic operating fluid selectively supplied from a pressurized hydraulic fluid source into an actuator or actuators for speed-change clutch-brakes of a multi-stage power shift transmission through hydraulic fluid circuits by the inter- position of predetermined directional control valves selected from a plurality of directional control valves connected with the actuators, respectively, has a hydraulic fluid pressure control valve assembly including a pressure modu- lating valve, a modulating relief valve, and a device for raising a preset relief pressure of the modulating relief valve. The preset relief pressure raising device comprises a balance piston-cylinder assembly actuated by a pressurized pilot fluid supplied from the pressurized hydraulic fluid source.
457798
Kabushiki Kaisha Komatsu Seisakusho
Sim & Mcburney
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