Hydromechanical transmission employing lockup clutch

Details Hydromechanical transmission employing lockup clutch Hydromechanical transmission employing lockup clutch

F - Mech Eng,Light,Heat,Weapons

16

D

74/168, 341/68

F16D 48/06 (2006.01) F16D 47/06 (2006.01)

Patent

CA 1159679

ABSTRACT OF THE DISCLOSURE A transmission system particularly usable for transmitting power from an internal combustion engine to the driving wheels of a vehicle such as a tractor includes a multiple ratio mechanical range transmission coupled to an infinitely variable ratio hydromechanical transmission via a manually operable ratio hydromechanical transmission coupling is used to couple the hydromechanical transmission to the engine, and an electronically controlled lockup clutch locks the impeller of the fluid coupling to the output turbine when the speed of the engine exceeds a first predetermined speed, and maintains the coupling locked until the speed of the engine drops below a second substan- tially lower predetermined speed.

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