Transmission with one-way clutches and failsafe method of and ap

Details Transmission with one-way clutches and failsafe method of and ap Transmission with one-way clutches and failsafe method of and ap

1990-05-08

1993-03-16

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

192 4A, 3644241, 74335, F16H 5900, F16H 6100

Patent

active

051934175

ABSTRACT:
A shift control apparatus controls the shifting of a transmission by selecting one power transmitting path at a time from a plurality of paths respectively having different speed reduction ratios. At least one power transmitting path is provided with a one-way clutch and an engine-brake clutch is included in the plurality of paths. The one-way clutch can be locked by the engine-brake clutch. An engine-brake clutch control valve is provided for controlling the engine-brake clutch. Two solenoid valves are provided for controlling the engine brake clutch control valve. When one of the two solenoid valves fails and is inactivated, the other solenoid valve is used to cause the engine-brake clutch control valve to engage the engine-brake clutch.

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