Patent ID: 8181547

Claim:
A speed change device for a traveling vehicle comprising: a thrust shaft ( 3 ) connected to an engine ( 2 ); a speed change mechanism ( 4 ) for changing between a high and a low speed provided to the thrust shaft ( 3 ); a counter shaft ( 5 ) for transmitting an output from the speed change mechanism ( 4 ) for changing between a high and a low speed; a mechanism ( 6 ) for switching between advancing and retracting provided to the counter shaft ( 5 ), the mechanism ( 6 ) having a forward-rotation idler gear ( 10 ) rotatably supported on the thrust shaft ( 3 ); a speed change shaft ( 7 ) for transmitting reverse-rotation power from the counter shaft ( 5 ) as forward-rotation power via the forward-rotation idler gear ( 10 ); a driven shaft ( 9 ) provided as an extension to the thrust shaft ( 3 ); and a main speed-change mechanism ( 8 ) having a driving gear group provided to the speed change shaft ( 7 ) and a driven gear group provided to the driven shaft ( 9 ).