MOTOR-VEHICLE DOUBLE-CLUTCH TRANSMISSION WITH GEAR SHIFT DEVICE COMPRISING A ROTARY DRUM AND MOTOR-VEHICLE HYBRID PROPULSION SYSTEM INCLUDING SUCH A TRANSMISSION
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United States of America Patent
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app pub date -
Oct 11, 2012
filing date -
Nov 13, 2009
priority date (Note) -
Abandoned
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Abstract
A transmission includes a first primary shaft carrying driving gearwheels for odd gears and reverse, a coaxial second primary shaft carrying driving gearwheels for the even gears, and a secondary shaft carrying idle driven gearwheels meshing with the driving gearwheels. The gearbox has a gear shift device having sliding engagement sleeves each arranged to connect a driven gearwheel corresponding to a given gear for rotation with a secondary shaft. Corresponding sliding shift forks cause an engagement sleeve to slide between a neutral and shift positions. A rotary drum has grooves on its cylindrical surface in which a stud slides, and is connected for translation with a respective shift fork in its sliding direction. An actuation unit rotates the drum stepwise among angular positions corresponding to engagement sleeves' predetermined positions. In a first angular position the engagement sleeves simultaneously engage gear reverse.
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