F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/73
F15B 9/08 (2006.01) F16H 61/02 (2006.01) F16H 61/06 (2006.01) F16H 59/08 (2006.01)
Patent
CA 1139639
Control System for Sequentially Actuating Fluid Actuators Abstract The heretofore known transmission control systems providing automatic sequential engagement of the fluid clutches have valves directly controlled by the operator and are not readily convertible to be pilot operated. The present invention has a selector valve movable between first and second positions for communicating a supply line with first and second fluid clutches respectively. A fluid actuated valve is moved to a first position communicating a third fluid clutch with a drain line when the fluid pressure in a fluid chamber threof drops below a preselected value and to a second position communicating the supply line with the third fluid clutch when the fluid pressure in the fluid chamber exceeds the preselected value. A dump valve drops the fluid pressure in the chamber below the preselected value in response to a momentary pressure drop in the supply line upon moving the selector valve between the first and second positions. An orifice delays filling of the fluid chamber until the selected one of the first and second clutches is engaged. The elements of the control system are fluid actuated and are, in effect, pilot operated.
376907
Caterpillar Tractor Co.
Kirby Eades Gale Baker
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