| 摘要 |
The addendum tooth profiles of the internal teeth and external teeth of a strain wave gearing device are prescribed by a first homothetic curve BC and a second homothetic curve AC obtained from a curve segment from a point A, at which the angle formed by the tangent to a movement trajectory MC when meshing is approximated by rack meshing and the major axis is θA, to a low point B. The dedendum tooth profile of the internal teeth is prescribed by a curve formed on the internal teeth in the course of the addendum tooth profile of the external teeth moving from an apex of the movement trajectory to point A. The dedendum tooth profile of the external teeth is prescribed by a curve formed on the external teeth when the addendum tooth profile of the internal teeth moves from the apex to arrive at point A. In the meshing of the two gears, the tooth surfaces of the internal teeth and the external teeth are congruous and as a result, a continuous meshing of the two kinds of teeth is formed. The present invention is able to increase transmitted torque and able to achieve prolonging of the service life of the strain wave gearing device. |
