| 摘要 |
PURPOSE:To eliminate installation of any useless hydraulic clutch, by constituting a device such that speed-shifting steps equivalent to the number of hydraulic clutch devices can be obtained at a main speed-shifting, and rotational power obtained by speed-shifting by use of a hydraulic clutch is branched for the first time into right and left sides by means of right and left clutches on an operating shaft. CONSTITUTION:A main clutch 29 for perfectly disconnecting a power transmission is located right after an engine 16, steering shafts 50 aligning with each other, are located right before left and right running output shafts 22 and 24, left and right side clutches 19 and 20 for independently disconnecting left and right power are situated on said steering shaft, gear trains in which a single power transmitting system is branched into plural sections, are located parallel to each other between the main clutch 29 and the side clutches 19 and 20, and a hydraulic clutch device for effecting speed shifting through selection of such gear trains is provided. As noted above, since a side clutch device is preceded by a hydraulic clutch type transmission gear, there is no need to mount a useless hydraulic clutch device, like the case of a laterally symmetrical hydraulic clutch type transmission gear installed at the rear stage of the side clutch, and since left and right driving sprockets are situated close to the side clutch, the operating force of the side clutch is reduced and operation can be performed sensitively. |
