| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a transmission by reducing a distance between shafts, reduce the number of components and prevent the failure in transmission and the like caused by a dimensional error by improving the accuracy in dimension between the shafts in the transmission for changing gears of a swiveling power transmission system in plural stages by plural gear change clutches. SOLUTION: The transmission 10 is provided with a linear power transmission system 14 for transmitting the traveling power in synchronization with left and right crawler driving shafts 16L, 16R, and a swiveling power transmission system 15 for selectively transmitting the traveling power to the left and right crawler driving shafts 16L, 16C while changing gears by plural gear change clutches C1-C4, gear change clutch cases 69L, 69R are formed independently from a transmission case 66 in assembling the gear change clutches C1-C4 in the gear change clutch cases 69L, 69R, and plural cases for gear change clutches are integrated.
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