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公开(公告)号：US20210364077A1
公开(公告)日：2021-11-25
申请号：US16982086
申请日：2018-05-14
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI , Takeo KODAIRA , Hiroshi YAMAZAKI
Abstract: The tooth profile contours of a rigid internally toothed gear and a flexible externally toothed gear in this strain wave gearing are stipulated by: meshing portions which each mesh with the opposing gear; tooth-crest-side convex surface portions which, respectively, are smoothly connected to the addendum-side ends of the meshing portions and extend from said ends to the apices of the tooth crests; and tooth-bottom-side concave surface portions which, respectively, are smoothly connected to the dedendum-side ends of the meshing portions and extend from said ends to the deepest parts of the tooth bottoms. The meshing portions and tooth-crest-side convex surface portions are machined portions that are simultaneously machined by topping gear cutting, and there are no edges on the teeth of either gear on the tooth-crest side.
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公开(公告)号：US20210018081A1
公开(公告)日：2021-01-21
申请号：US16907477
申请日：2020-06-22
Applicant: Harmonic Drive Systems Inc.
Inventor： Takeo KODAIRA
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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