Gear apparatus
AssigneeSeiko Epson Corporation
InventorKenichi Ushikoshi
Life of this patent
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Abstract
A gear train has a sun gear with a tooth count e, n (where n is a natural number of 2 or more) planetary gears having a first gear part with a tooth count z1 meshing with the sun gear and a second gear part with a tooth count z2, a fixed internal tooth gear with a tooth count I1 meshing with the first gear part of the planetary gears, and a movable internal tooth gear with a tooth count I2 meshing with the second gear part of the planetary gears, where tooth counts e, z1, z2, I1 and I2 are each a multiple of n. Even if the gear form of each gear has a small module, a planetary gear train mechanism can be configured without raising operating or assembly problems, and it can be miniaturized more than conventional gear trains while still have a sufficient gear reduction ratio.
Claims10
A gear train comprising:
- a sun gear with a tooth count e;
- n planetary gears where n is a natural number of 2 or more, each planetary gear having a first gear part with a tooth count z1 and a second gear part with a tooth count z2, the first gear part of said planetary gears meshing with said sun gear;
- a fixed internal tooth gear with a tooth count I1 meshing with the first gear part of said planetary gears;
- and
- a movable internal tooth gear with a tooth count I2 meshing with the second gear part of said planetary gears;
- wherein tooth counts e, z1, z2, I1 and I2 are all multiples of n.
Dependencies are inferred from the claim text.