Planetary gear device series
AssigneeHarmonic Drive Systems Inc.
InventorsNorio Shirokoshi, Yasushi Ono
Life of this patent
Estimating the term…
Abstract
In a planetary gear device series composed of eight kinds of planetary gear devices with gear reduction ratios of 3 to 10, the planetary gear device of each gear reduction ratio uses an internal gear with 108 teeth or a slightly different number of teeth, and the module is common among the planetary gear devices of all gear reduction ratios. The combinations of the sun gear teeth number Za and the internal gear teeth number Zc in the planetary gear device of each reduction ratio are given in Table 1 of this application.
Claims2
A planetary gear device assembly configured to selectively make a plurality of types of planetary gear devices having differing gear reduction ratios R of 3, 4, 5, 6, 7, 8, 9, and 10, the planetary gear device assembly comprising:
- a plurality of sun gears, three internal gears, and a plurality of planetary gears,
- wherein each of the plurality of gears comprises a normal module, wherein the normal module is the same among the plurality of sun gears, internal gears, and planetary gears, and wherein, each of the planetary gear devices is made from at least one of the plurality of sun gears, at least one of the plurality of planetary gears, and at least one of the three internal gears, and in each of the planetary gear devices a number of teeth Za of the at least one sun gear and a number of teeth Zc of the at least one internal gear are set to the following values:
- R 3, Za 54, Zc 108;
- R 4, Za 36, Zc 108;
- R 5, Za 27, Zc 108;
- R 6, Za 21, Zc 105;
- R 7, Za 18, Zc 108;
- R 8, Za 15, Zc 105;
- R 9, Za 13, Zc 104;
- and
- R 10, Za 12, Zc 108.
Dependencies are inferred from the claim text.