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公开(公告)号：US20180347679A1
公开(公告)日：2018-12-06
申请号：US15995363
申请日：2018-06-01
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
CPC classification number: F16H49/001 , F16H55/0833 , F16H2049/003
Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.
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公开(公告)号：US10788114B2
公开(公告)日：2020-09-29
申请号：US15995363
申请日：2018-06-01
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.
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Patent Agency Ranking
公开(公告)号：US09746065B2
公开(公告)日：2017-08-29
申请号：US14767220
申请日：2013-11-29
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
IPC: F16H49/00
CPC classification number: F16H49/001 , F16H2049/003
Abstract: The addendum tooth profile of the inner teeth and outer teeth of a strain wave gearing is stipulated by a first and second similar curve obtained from the curve segment from an inflection point to a low point in a movement trajectory when the meshing of both teeth is approximated by rack meshing. The addendum tooth profile of the inner teeth is stipulated by a curve generated at the inner teeth in the process of the addendum profile of the outer teeth moving from the inflection point to the apex of the movement trajectory. The addendum tooth profile of the outer teeth is stipulated by a curve generated at the outer teeth when the addendum profile of the inner teeth moves from the inflection point to the apex. The addendum profile of the outer teeth makes double contact with the addendum profile and dedendum profile of the inner teeth.
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公开(公告)号：US10883589B2
公开(公告)日：2021-01-05
申请号：US15112467
申请日：2015-12-04
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
Abstract: In a strain wave gearing, the addendum tooth profile of an inner gear is defined by a formula and that of an outer gear is by another formula at a principal cross-section located at a tooth-trace-direction center of the outer gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the outer gear with respect to those of the inner gear. The tooth profiles of the dedenda of each of the inner gear and the outer gear are set to any shape that does not interfere with the tooth profile of the addendum of the other gear. It is possible to avoid superimposed flexion-induced bending stresses and tensile stresses caused by load torque arising at the long-axis locations of the outer gear, and the transmission torque capacity of a strain wave gearing can be improved.
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公开(公告)号：US10174825B2
公开(公告)日：2019-01-08
申请号：US15102409
申请日：2014-12-09
Applicant: Harmonic Drive Systems Inc.
Inventor： Shoichi Ishikawa
IPC: F16H49/00
Abstract: A strain wave gearing is a negative deflection strain wave gearing. The tooth profile shape for the internally toothed gear is defined by using a convex, basic tooth profile curve, which is a curve portion from an inflection point (A) to a bottom-part point (B) of a moving locus (Mc) of an externally toothed gear with regard to an internally toothed gear obtained by a rack meshing approximation. The tooth profile shape for the externally toothed gear at a principal cross section is defined by a concave, basic tooth profile curve, which is generated in the externally toothed gear by the convex, basic tooth profile curve of the internally toothed gear moving from an apex (C) to an inflection point (A) of the moving locus (Mc). Passing-type meshing that is effective in lubrication is established, and bending stress in the tooth-bottom rim of the externally toothed gear can be reduced.
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公开(公告)号：US10788115B2
公开(公告)日：2020-09-29
申请号：US16068383
申请日：2016-01-15
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of κ=1 of the teeth of the external gear with respect to those of the internal gear in the principle cross-section taken at the center of the tooth trace of the external gear obtained when the tooth meshing is approximated by rack meshing. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.
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7.发明授权公开(公告)号：US09903459B2
公开(公告)日：2018-02-27
申请号：US14892047
申请日：2014-07-11
Applicant: Harmonic Drive Systems Inc.
Inventor： Shoichi Ishikawa
CPC classification number: F16H49/001 , F16H55/08 , F16H55/0833 , F16H2049/003
Abstract: A strain wave gearing includes a rigid internally toothed gear, a flexible externally toothed gear disposed coaxially within the internally toothed gear, and a wave generator fitted within the externally toothed gear. The internally toothed gear and the externally toothed gear are spur gears having module m; and the number of teeth of the externally toothed gear is 2n less than the number of teeth of the internally toothed gear, where n is a positive integer. Taking a transverse cross-section at a prescribed position along a tooth trace direction of the external teeth as a main cross-section, a degree of flexing, with respect to a rim-neutral circle of the externally toothed gear prior to ellipsoidal flexing, of a rim-neutral line of the ellipsoidally flexed externally toothed gear is set, at a position on the major axis in the main cross-section, to 2mn.
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