Wave gear device
AssigneeHarmonic Drive Systems Inc.
InventorMasaru Kobayashi
Life of this patent
Estimating the term…
Abstract
A wave gear device is proposed having an anti-ratcheting mechanism having a simple configuration, wherein a center through-hole is formed in a cylinder hub of a wave generator, a small-diameter shaft end portion of a rotating input shaft is concentrically inserted in the center through-hole, and the two members are fastened by a fastening bolt, and a friction ring is concentrically sandwiched between the small-diameter shaft end portion and the cylinder hub and pressed in the radial direction with a prescribed force, whereby when transmission torque from the rotating input shaft to the wave generator 4 becomes excessive, slippage occurs in the rotational direction between the two members, transmission torque is limited, ratcheting generated between the two gears can be prevented.
Claims3
A wave gear device comprising:
- a rigid internally toothed gear;
- a flexible externally toothed gear coaxially disposed inside the rigid internally toothed gear;
- a wave generator fitted inside of the flexible externally toothed gear;
- a rotating input shaft;
- a friction member disposed in between the wave generator and the rotating input shaft so as to be sandwiched from a radial direction or an axial direction thereof;
- and
- a fastening member for coaxially fastening the wave generator and the rotating input shaft in a state in which the friction member is sandwiched therebetween, the fastening member being threadably secured directly to the input shaft;
- and
- a washer disposed between the fastening member and the input shaft;
- wherein
- the wave generator and the rotating input shaft integrally rotate due to a frictional coupling force of the friction member, and generate slippage in the rotational direction therebetween when the transmission torque between the wave generator and the rotating input shaft reaches a predetermined value or higher.
Dependencies are inferred from the claim text.