Invention Application
- Patent Title: STRAIN WAVE GEARING
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Application No.: US16907477Application Date: 2020-06-22
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Publication No.: US20210018081A1Publication Date: 2021-01-21
- Inventor: Takeo KODAIRA
- Applicant: Harmonic Drive Systems Inc.
- Applicant Address: JP Tokyo
- Assignee: Harmonic Drive Systems Inc.
- Current Assignee: Harmonic Drive Systems Inc.
- Current Assignee Address: JP Tokyo
- Priority: JPPCT/JP2019/028540 20190719
- Main IPC: F16H49/00
- IPC: F16H49/00 ; F16H1/32

Abstract:
A strain wave gearing has a cup-shaped externally toothed gear that is provided with a body formed with external teeth, a diaphragm extending from an end of the body, and a rigid boss integrally formed in the diaphragm. The ratio B/A is set equal to or less than 0.59 where A is the reference pitch circle diameter of the external teeth and B is the outer diameter of the boss. The radial length from the inner peripheral edge of the diaphragm to the outer peripheral edge thereof in the present externally toothed gear is large. This enables to reduce bending stress generated in each part of the externally toothed gear due to coning, and a meshing state of the external teeth with the internal teeth in the tooth trace direction can also be improved, whereby further flattening of the externally toothed gear can be realized.
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