Getriebe mit extrem niedrigem Geschwindigkeitbereich.

摘要

A transmission includes a main shaft (14) and a counter shaft (16). The gear ratio is changeable in accordance with the engagement between a main shaft gear train mounted on the main shaft and a counter shaft gear train mounted on the counter shaft. A low speed gear mechanism (76) provides an extremely low speed range and includes a low speed shaft (84) provided with a gear train and disposed coaxially with the main shaft. A first changeover sleeve (116) is movable in order to bring the low speed shaft into and out of engagement with the main shaft. A second changeover sleeve (124) is movable for selectively shifting a forward low speed gear train and a reverse low speed gear train into driving engagement between the low speed shaft and the counter shaft.