公开(公告)号：US20180149255A1

公开(公告)日：2018-05-31

申请号：US15576088

申请日：2015-06-23

Applicant: Harmonic Drive Systems Inc.

Inventor： Shoichi ISHIKAWA

IPC: F16H49/00 ,  F16H55/08

CPC classification number: F16H49/001 ,  F16H55/08 ,  F16H55/0833 ,  F16H55/088 ,  F16H2049/003

Abstract: The dedendum tooth profiles of the internal teeth and external teeth of a strain wave gearing 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 locus 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 locus 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.

公开(公告)号：US20190003569A1

公开(公告)日：2019-01-03

申请号：US16068383

申请日：2016-01-15

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shoichi ISHIKAWA

IPC: F16H55/08 ,  F16H49/00

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.

公开(公告)号：US20160356373A1

公开(公告)日：2016-12-08

申请号：US15102409

申请日：2014-12-09

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shoichi ISHIKAWA

IPC: F16H49/00

CPC classification number: F16H49/001 ,  F16H2049/003

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.

Abstract translation: 应变波传动是负偏转应变波齿轮传动。 内齿齿轮的齿廓形状通过使用凸的基本齿廓曲线来定义，该凸形基本齿廓曲线是从运动轨迹（Mc）的拐点（A）到底部点（B）的曲线部分 相对于通过齿条啮合近似获得的内齿齿轮的外齿齿轮。 用于外齿齿轮在主横截面处的齿廓形状由凹形的基本齿廓曲线限定，该凹形基本齿廓曲线通过内齿齿轮从顶点移动的凸形基本齿廓曲线在外齿齿轮中产生 （C）到移动轨迹（Mc）的拐点（A）。 建立了有效润滑的通过型啮合，可以减少外齿齿轮的齿底边缘的弯曲应力。

公开(公告)号：US20160003338A1

公开(公告)日：2016-01-07

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.

Abstract translation: 应变波传动装置的内齿和外齿的齿顶齿廓由当从两个齿的啮合近似的从运动轨迹的拐点到低点的曲线段获得的第一和第二相似曲线规定 通过机架网格划分。 内齿的齿顶齿廓由在从拐点移动到移动轨迹的顶点的外齿的齿顶轮廓的过程中由内齿产生的曲线规定。 当外齿的齿顶轮廓从拐点移动到顶点时，外齿的齿顶齿廓由外齿上产生的曲线规定。 外齿的齿顶轮廓与内齿的齿顶轮廓和齿根轮廓形成双重接触。

公开(公告)号：US20180259053A1

公开(公告)日：2018-09-13

申请号：US15112467

申请日：2015-12-04

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shoichi ISHIKAWA

IPC: F16H49/00 ,  F16H55/08 ,  F16H1/32

CPC classification number: F16H49/001 ,  F16H1/32 ,  F16H3/70 ,  F16H55/08 ,  F16H55/0833

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.

公开(公告)号：US20170159789A1

公开(公告)日：2017-06-08

申请号：US14892047

申请日：2014-07-11

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shoichi ISHIKAWA

IPC: F16H49/00 ,  F16H55/08

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.