| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear transmission capable of improving the degree of setting speed reduction ratio and obtaining a larger speed reduction ratio without causing a greate increase in cost. SOLUTION: A planetary gear PG is divided to be comprised of a planetary gear PG1 at a fixed side engaged with a fixed ring gear RG1 and a planetary gear PG2 on the driven side engaged with a driven ring gear RG2. Further, the planetary gear PG1 on the fixed side and the planetary gear PG2 on the driven side are arranged on a coaxial axis by means of a phase difference of a value equivalent to integer times of the value, in which an angleθbetween a center of a rotary axis of the planetary gear PG and adjacent teeth of the planetary gear PG multiplied by a differenceΔZ for numbers of teeth between the fixed ring gear RG1 and driven ring gear RG2 is further divided by the number n of the planetary gear PG. Here, the differenceΔZ for numbers of teeth is the value equivalent to non-integer times of the number n of the planetary gear PG, concretely a smaller value than the number n, more concretely 1. COPYRIGHT: (C)2004,JPO
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