Getriebe für ein Arbeitsfahrzeug

摘要

A transmission for a tractor like working vehicle is arranged in a transmission housing (1) between the engine and the rear axle housing (2). The interior of transmission housing (1) is divided into a front chamber A and a rear chamber B through a partition wall (1a). In front chamber A is disposed a main-clutch system centering on travelling-input shaft (7). In rear chamber B is disposed a speed-changing system as a combination of reversing arrangement and multi-speed-changing arrangement. In a rear opening of housing (1) is disposed a bearing plate (3). In rear chamber B, a first speed-changing shaft (8), a second speed-changing shaft (9) and a front transmission output shaft (10) are supported in parallel between wall (1a) and plate (3). A regular speed-reduction gear train and a reversing speed-reduction gear train are interposed between shafts (8 and 9). Shafts (8 and 9) can be connected with each other through one of the gear trains by a first clutch device C1 on shaft (8). A second clutch device C2 is on shaft (9) so as to selectively connect shafts (7 and 9) directly. A plurality of gear trains for multi-speed stages are interposed between shafts (9 and 10), so that shafts (9 and 10) are connected with each other through one of the gear trains by a third clutch device C3 on shaft (10). A cover (51) is settled on housing (1). A main (second) speed-changing lever (52) and a sub (first) speed-changing lever (55) are disposed respectively at both lateral sides of cover (51). Third clutch device C3 is operated by lever (52). First and second clutch devices C1 and C2 are selectively operated by lever (55).