Compound vehicular transmission

Details Compound vehicular transmission Compound vehicular transmission

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 37/06 (2006.01) F16H 1/22 (2006.01)

Patent

CA 2153608

A compound vehicular transmission having a main section and an auxiliary section which includes an auxiliary countershaft gear assembly having an auxiliary countershaft, a first auxiliary countershaft gear fixed to the auxiliary countershaft and constantly meshed with an output shaft range gear, and a second auxiliary countershaft gear selectively coupleable to the auxiliary countershaft and constantly meshed with an intermediate shaft output gear. A jaw clutch is provided for coupling either the auxiliary countershaft to the main countershaft, or the auxiliary countershaft to the second auxiliary countershaft gear. This allows fewer gears to be utilized to achieve a desired number of speed ratios. Since the auxiliary countershaft drive gears are clutched only when used, this arrangement reduces spin back speed of the intermediate shaft to accommodate smoother and faster shifting of the transmission. Alternative embodiments include the use of a two-speed master clutch splitter section or a two- position synchronizing clutch assembly as the input to the main transmission section.

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