Preselected multiratio transmission

摘要

A preselected multiratio transmission has three selectively engageable input friction clutches and three selectively engageable synchronized mechanical ratio clutches. The friction clutches are connected with respective input shafts each of which shafts has two input ratio gears rotatably mounted thereon and one of the synchronized clutches connected therewith. Each synchronized clutch is operable to control two gear ratios. A countershaft has a plurality of output ratio gears connected therewith, which gears mesh with respective ones of the input ratio gears. The countershaft is drivingly connected with a transmission output means. The synchronized clutches are operated to preselect a drive ratio which is then completed by the engagement of the friction clutch associated therewith and the substantially simultaneous disengagement of either of the other friction clutches which may have been engaged. The judicious selection of friction clutches and synchronized clutches permits the transmission to be operated in a conventional step ratio pattern or in a plurality of skip ratio patterns.