Manual override of an automatic ratio controller in a hydromecha

Details Manual override of an automatic ratio controller in a hydromecha Manual override of an automatic ratio controller in a hydromecha

1990-10-15

1992-01-14

Herrmann, Allan D.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 363, 192 357, 74473R, 74479, 180 63, 180133, B60K 4124, F16D 6700, B62D 1100

Patent

active

050802097

ABSTRACT:
To override the vehicle immobilizing effect of a failed automatic ratio controller in a hydromechanical transmission, the conventional manually shiftable range selector is loosely linked with a ratio arm while the latter is being stroked by the controller to vary hydrostatic output speed. Upon controller failure, the range selector is drivingly linked with the ratio arm, such that shifting movements of the range selector are translated into stroking movements of the ratio arm to provide manual control of vehicle propulsion. Safeguards are provided to ensure that conversion between the normal propulsion mode governed by the automatic ratio controller and the override propulsion mode manually governed by the vehicle operator is effected in a safe manner.

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