| 摘要 |
PROBLEM TO BE SOLVED: To compactly build running drive construction in a machine by providing a hydraulic continuously variable transmission mechanism for running and a hydraulic continuously variable transmission mechanism for turning generating speed difference for driving right and left running crawlers, and constituting the form of the continuously variable transmission mechanism for turning smaller than the continuously variable transmission mechanism for running. SOLUTION: A transmission case driving running crawlers 2 is provided with a speed changing member 25 constituting a hydraulic continuously variable transmission mechanism for running having first hydraulic pump and hydraulic motor, and a steering member 28 constituting a hydraulic continuously variable transmission mechanism for turning having second hydraulic pump and hydraulic motor. In this case, the speed changing member 25 requiring larger steering drive force for turning operation force output from the steering member 28 is constituted into a larger form (larger capacity). The steering member 28 is on the front side of the upper part of the transmission case, the speed changing member 25 is on the rear side, respectively integratedly fixedly provided to minimize to projection of the steering member 28 in front of the transmission case.
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