发明名称 |
Wave gear drive with continuous meshing, high ratcheting torque tooth profile |
摘要 |
A wave gear drive comprises a circular rigid internal gear and a flexible external gear inside the rigid internal gear. A wave generator in the flexible external gear flexes the flexible external gear into an elliptical shape. The cross-section of the flexible external gear perpendicular to the axis at a point in the tooth trace direction of the flexible external gear is set as the main cross-section. The rigid internal gear and flexible external gear are gears with a module m, and the flexible external gear has a number of teeth that is smaller than the number of teeth of the rigid internal gear. The moving route M of a tooth of the flexible external gear with respect to a tooth of the rigid internal gear that accompanies rotation of the wave generator when meshing of the teeth in the main cross-section is approximated by rack meshing. On the entering side of the meshing of the teeth to the major axis of the moving route M, a first similar curve AC is obtained by similarity transformation of a pressure angle alpha orthogonal to the direction of the moving route M. The first similar curve AC is employed as the basic addendum tooth profile of the rigid internal gear. A second similar curve CB is obtained by rotating the first similar curve AC 180 E about endpoint C, and by a similarity transformation in which the first similar curve AC is multiplied by a ratio of similitude (1-lambda)/lambda The second similar curve CB is employed as the basic addendum tooth profile of the flexible external gear.
|
申请公布号 |
US2007180947(A1) |
申请公布日期 |
2007.08.09 |
申请号 |
US20070652049 |
申请日期 |
2007.01.11 |
申请人 |
HARMONIC DRIVE SYSTEMS INC. |
发明人 |
ISHIKAWA SHOICHI;TAKIZAWA NOBORU |
分类号 |
F16H35/00 |
主分类号 |
F16H35/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|