Patent ID: 6595078
Filing Date: 2003-07-22
Classification: F16H,Y10T

Abstract:
A transmission apparatus for a vehicle having an engine unit housed in an engine case in which a crankshaft extends in a vehicle width direction, a clutch mechanism is disposed on one side thereof, a counter shaft and a drive shaft are disposed in parallel to each other behind the crankshaft, wherein the transmission apparatus is provided for the counter shaft and the drive shaft, said transmission apparatus comprising:a multistage transmission gear train provided for the counter shaft and the drive shaft, to be in parallel to the crankshaft, said multistage transmission gear train including forward gears and a reverse gear; a forward gearshift cam for controlling a switching operation of the forward gears, said forward gearshift cam being provided, on an outer periphery thereof, with a flange portion integrally formed therewith, said flange portion being formed with an arcuate cutout on a peripheral portion thereof; and a reverse gearshift cam for controlling a switching operation of the reverse gear, said reverse gearshift cam being located in a vicinity of the forward gearshift cam so as to be in parallel thereto, said reverse gearshift cam being formed with a tongue-shaped projection on an outer periphery thereof so as to be engageable with the cutout of said forward gearshift cam, wherein positions of said cutout and said projection in a circumferential direction are determined so that the reverse gearshift cam is permitted to turn to a reverse position at a time only when said forward gearshift cam turns to a neutral position, and at a time when said reverse gearshift cam turns to a reverse position, at least a portion of the projection engages with the cutout to prevent the forward gearshift cam from turning to a position other than the neutral position.