| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that the connection on a transmission passage between straight driving, gentle-braking turn, and pivotal brake turn is not smooth up to now, and in a driving transmission having two hydraulic continuously variable transmissions, since transmission systems are arranged in series, the driving of a hydraulic pump which is transmitted later is unstable, especially low speed output is disordered, and an operation range is narrowed. SOLUTION: In a transmission case 1 of driving crawlers 3, 3', a driving hydraulic continuously variable transmission 4 and a turning hydraulic continuously variable transmission 6 are driven in a transmission passage independent of an engine. Right and left wheel shafts 2, 2' are connected to side clutches 8, 8' made of a multiple disc clutch. Right and left transmission systems comprising right and left driven gears 9, 9' of the side clutches 8, 8' and right and left side gears 10, 10' of a differential gear device 7 are connected so that the power of reverse turning is transmittable each other.
|
