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US 5,827,149 AGranted
Electrically operated park lock for automatic transmission
AssigneeHi-Lex Corporation
InventorEdward E. Sponable
Life of this patent
Estimating the term…
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AssigneeHi-Lex Corporation
InventorEdward E. Sponable
Estimating the term…
An electrically powered park lock actuator for use with an automotive vehicle transmission. The actuator is mechanically independent from a shift actuator which shifts the transmission between gear ranges, and comprises two high-speed, reversible DC electric motor acting via a speed reduction gear train to move a locking pawl into and out of engagement with a gear on the transmission output shaft. The shafts of the two motors are connected to a common worm which forms the fist stage of the gear train, and either one of the motors is individually capable of actuating the locking pawl. In the preferred embodiment, the park lock actuator is controlled by an electronic transmission control system so that the lock actuator may be controlled in coordination with a power-operated transmission gear shift actuator for integrated operation of the transmission. A back-up battery is supplied to provide sufficient power to unlock the transmission in the event of a failure of the vehicle main electrical power system.
A transmission lock actuator for use with an automotive vehicle automatic transmission of the type having a plurality of gear ranges, shift actuator means for shifting the transmission between gear ranges, an output shaft, and locking means movable between a first position wherein the locking means inhibits rotation of the output shaft and a second position wherein the locking means does not inhibit rotation of the output shaft, the transmission lock actuator characterized in that:
A transmission lock actuator for use with an automotive vehicle automatic transmission of the type having a plurality of gear ranges, shift actuator means for shifting the transmission between gear ranges, an electronic transmission control system for controlling operation of the shift actuator means, an output shaft, and locking means movable between a first position wherein the locking means inhibits rotation of the output shaft and a second position wherein the locking means does not inhibit rotation of the output shaft, the transmission lock actuator characterized in that:
An automotive vehicle automatic transmission having a plurality of gear ranges, an output shaft, power-actuated shift means for shifting the transmission between gear ranges, a transmission lock movable to selectively inhibit rotation of the output shaft, and a transmission lock actuator for moving the transmission lock and comprising electric drive means, said electric drive means being separate from the power-actuated shift means.
Dependencies are inferred from the claim text.