Countershafts power transmission

U.S. Patent Number: 5390560

Abstract: A countershaft transmission has an input shaft and a coaxial output shaft which are disposed in parallel with a pair of countershafts. The countershafts position and support a floating bearing support which is positioned to support ends of the input and output shafts. The countershafts each have a selectively engageable clutch disposed thereon which selectively control the establishment of drive ratios between the input shaft and the respective countershafts. A plurality of forward and reverse ratios are selectively established, between the input and output shafts through the countershafts, by selectively engaging a plurality of synchronizers. The synchronizers cooperate with a plurality of ratio gears on the countershafts and output shaft to establish the ratios. The ratio gears that establish the lowest forward ratios are fully disengageable from their respective countershafts.

Inventors: Ordo; Richard A. (Greenwood, IN)

Assignee: General Motors Corporation (Detroit, MI)

Application Number: 08/015,698

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 74/329 ; 74/331

Field of search: 74/325,329,331,360

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