| 摘要 |
PROBLEM TO BE SOLVED: To provide various swiveling patterns without changing gears of a swiveling power transmission system by HST and prevent the mud form being pressed by a crawler in any swiveling pattern in a transmission provided with a linear power transmission system and a swiveling power transmission system. SOLUTION: The transmission 10 is provided with the linear power transmission system 14 for transmitting the traveling power in synchronization with left and right crawler driving shafts 16L, 16R, and the swiveling power transmission system 15 for selectively transmitting the traveling power to the left and right crawler driving shafts 16L, 16R while changing gears by plural gear change clutches C1-C4, the swiveling power transmission system 15 is provided with slow swiveling conditions (7:3, 9:1) of plural stages for slowly swiveling a machine body while decelerating the crawler driving shafts 16L, 16R inside the swiveling, and further the crawler driving shafts 16L, 16R inside swiveling is slowly driven at a low speed approximately in a stop condition (slow swiveling 9:1) in a final decelerating condition.
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