Vehicle transmission having manually shifted lower gears and...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 47/00 (2006.01) F16H 59/70 (2006.01) F16H 61/28 (2006.01) F16H 63/20 (2006.01) F16H 63/36 (2006.01) F16H 61/02 (2006.01) F16H 63/30 (2006.01) F16H 63/44 (2006.01)

Patent

CA 2134716

ABSTRACT OF THE DISCLOSURE A transmission includes a plurality of shift rails, each of which is axially movable forwardly and rearwardly from a center neutral position to respective gear engaging positions. The lower shift rails are provided for manual shifting among the lower gear ratios of the transmission. The highest shift rail is provided for selective manual or automatic shifting among the highest two gear ratios of the transmission. An idler rail is disposed adjacent to the highest shift rail. For manual shifting, the idler rail is connected to the highest shift rail, and a manually operable shift lever is used to move both the idler rail and the highest shift rail. For automatic shifting, the idler rail is disconnected from the highest shift rail, and an automatic shift member is moved into cooperation with the highest shift rail. Rotation of the automatic shift shaft causes corresponding movement of the automatic shift member. An electronic controller is provided for controlling the automatic shifting of the transmission in response to sensed operating conditions of the vehicle. A circuit is provided for sensing the rotational position of the automatic shift shaft and for generating an electrical signal which is representative of the actual position thereof, which is also representative of the actual position of the highest shift rail, to the electronic controller.

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