| 摘要 |
PURPOSE:To provide possibility of easily changing the speed reduction ratio only by means of replacement of major gear by mounting a load side bracket on a gear case in dislocation by an amount corresponding to the pitch of mounting bolt. CONSTITUTION:Bolt mounting holes are bored in a bracket 21 in a constant pitch in the number of pieces m, and mounting of the bracket 21 is made dislo cated by an amount corresponding to the number of pitches K (K=1, 2, 3...Xm/2). That is, the interpolar distance between a minor gear 6 and a major gear 11 can be altered in different modes in the number of m/2 by changing the location of the bracket mounted 21. This does not require replacement of minor gear 6, but different speed reduction ratios can be obtained by giving the major gear 11 a varying actual diameter through the use of only one rotary shaft.
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