Strain wave gearing
AssigneeHarmonic Drive Systems Inc.
InventorsTatsuro HOSHINA, Masakatsu SASAHARA
Life of this patent
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Abstract
First and second external tooth gear parts of a strain wave gearing are bent in an elliptic shape by a wave generator to engage with first and second internal tooth gears, respectively. The first and second external tooth gear parts are bent so as to have elliptic shapes the phases of which are rotated 90 degrees from each other about a rotational center line. A coupling external tooth gear part that maintains a circular cross-sectional shape which does not deform is formed in between the first and second external tooth gear parts. The coupling external tooth gear part is maintained so as to be coupled with a coupling internal tooth gear in an engaged manner. The strain wave gearing has high engagement rigidity and is capable of transmitting large torque.
Claims8
A strain wave gearing comprising:
- a tube body capable of flexing in a radial direction;
- a first externally toothed gear portion and a second externally toothed gear portion formed in the tube body in sections set apart along a direction of a center axis of the tube body;
- a coupling externally toothed gear portion formed in the tube body between the first externally toothed gear portion and the second externally toothed gear portion in the direction of the center axis;
- a wave generator causing the tube body to flex in the radial direction so that the coupling externally toothed gear portion has a circular cross-sectional shape and the first and second externally toothed gear portions have a non-circular cross-sectional shape;
- a first internally toothed gear with which the first externally toothed gear portion flexed by the wave generator is partially meshed;
- a second internally toothed gear with which the second externally toothed gear portion flexed by the wave generator is partially meshed;
- and
- a coupling internally toothed gear meshingly linked with the coupling externally toothed gear portion.
Dependencies are inferred from the claim text.