| 摘要 |
PROBLEM TO BE SOLVED: To provide a tumbler improved in mating of a sprocket with a chain and in particular designed for use in the crawler traveling unit for the lattice mast crane. SOLUTION: The sprocket of the tumbler 1 has two semi-circular divisions U, U'. Each semi-circular division U, U' has different circular tooth pitches 8.1-8.5 that vary from a segment Si to the next segment Si with a constant tooth width 3. The quotient of the sum of different circular pitches 8.1-8. 5 on each semi-circular division U, U' divided by 5 that is the number of teeth 2 mating with the chain in each semi-circular division U, U' corresponds to a constant circular pitch. The circular pitches 8.1-8.5 decrease from the maximum to the minimum in the rotational direction 4 of the tumbler 1 within each semi-circular division U, U'. The maximum difference in the circular pitch 8 takes place in the transition from one semi-circular division U to the next U'.
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