| 摘要 |
PROBLEM TO BE SOLVED: To share a reduction gear case in hollow and solid shapes where the diameter of an output shaft differs by forming the bearing part of the output shaft of the reduction gear case corresponding the output shaft of the maximum diameter to be incorporated and fitting the incorporated output shaft while engaging an annular spacer to the outer periphery of a bearing. SOLUTION: The bearing-fitting part of an output shaft 9 of reduction gear cases 18 and 19 is formed corresponding to the output shaft 9 in a hollow shape where the diameter is minimized. When a solid output shaft 9 with a small diameter is to be fitted, an annular spacer 31 is loaded to the outer periphery of bearings 15 and 16 of the output shaft 9 for fitting. In this case, the outer diameter of the annular spacer 31 is fitted to the inner diameter of the bearing- fitting part of the reduction gear cases 18 and 19, the inner diameter is fitted to the outer diameter of the bearings 15 and 16 of the output shaft 9, and a step 31a for positioning is provided at the inner-diameter side, thus sharing the reduction gear cases 18 and 19 even if the diameter of the output shaft differs and reducing the number of parts.
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