Automatic transmission

An automatic transmission for a vehicle having a plurality of gear trains provided between an input shaft and an output shaft, comprising:

• a hollow shaft coaxially including said input shaft;
• a forward drive gear rotatably mounted on said hollow shaft;
• a forward driven gear integrally mounted on said output shaft and constantly meshing with said forward drive gear;
• a reverse drive gear rotatably mounted on said input shaft adjacently to said forward drive gear;
• a friction clutch provided between said input shaft and said hollow shaft for selectively transmitting power from said input shaft to said hollow shaft;
• a changeover hub integrally mounted on said hollow shaft between said forward drive gear and said reverse drive gear;
• an first idler gear constantly meshing with said reverse drive gear;
• a second idler gear integrally formed with said first idler gear and constantly meshing with said forward driven gear;
• and
• a changeover member provided between said forward drive gear and said reverse drive gear for engaging said changeover hub either with said forward drive gear or said reverse drive gear.