Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1979-12-11
1982-01-12
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74856, 74687, 74752C, 74869, B60K 4106, F16H 4704
Patent
active
043099173
ABSTRACT:
A cross drive transmission having a hydromechanical propulsion drive and hydrostatic steer drive. In the controls, a ratio governor has a set speed control wherein set speed is established in accordance with throttle position, steer request, engine power and brake torque. Advance and return signals regulate the speed ratio of the hydromechanical drive so input speed equals the set speed. A rate of change control provides fast increase of the return signal, slow increase of the advance signal in higher ratios and very slow increase of the advance signal in low ratio. Manual controls, return and advance signal control valves, shift signal valves and shift valves, in neutral, provide substantially zero displacement in the hydrostatic unit and neutral in the gear unit, and, in drive positions, coordinate hydrostatic ratio control and gear ratio control for continuous variable ratio change in the hydromechanical propulsion drive. Overpressure in the propulsion hydrostatic unit controls the ratio governor to provide only a return signal and disengages all gear ratio drives until output speed is reduced to a low value and hydrostatic unit displacement is reduced substantially to zero for smooth reengagement of drive. Underpressure in the hydrostatic steer drive disables the steer controls. The steer controls are also disabled at low engine speeds and low engine power so steer load does not stall the engine and in neutral manual range to prevent inadvertent steering.
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Braun Leslie
General Motors Corporation
Schwartz Saul
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