公开(公告)号：US20190368576A1

公开(公告)日：2019-12-05

申请号：US16476587

申请日：2017-10-19

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Norio SHIROKOSHI ,  Yuya MURAYAMA ,  Yoshitomo MIZOGUCHI ,  Satoshi KISHI

IPC: F16H1/32 ,  F16H57/08 ,  F16H55/17

Abstract: A strain wave gearing wherein the tooth profile of an external teeth of a cup-shaped or silk-hat-shaped external gear is set as follows. The tooth-tip tooth thickness decreases gradually from an external-teeth outer end toward an external-teeth inner end along an external tooth trace direction. In addition, a pressure angle at a pitch point (P) increases gradually from the external-teeth outer end toward the external-teeth inner end along the external tooth trace direction. Thus, it is possible to realize a cup-type or silk-hat-type strain wave gearing in which external teeth mesh with internal teeth in a wide range along the tooth trace direction, rather than only in one cross-section perpendicular to the axis in the tooth trace direction.

公开(公告)号：US20230358304A1

公开(公告)日：2023-11-09

申请号：US17639630

申请日：2020-10-30

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Norio SHIROKOSHI ,  Satoshi KISHI ,  Yoshihide KIYOSAWA

IPC: F16H49/00

CPC classification number: F16H49/001 ,  F16H2049/003

Abstract: A three-dimensional tooth profile of internal teeth in a strain wave gearing is a basic internal-teeth tooth profile at an internal-teeth outer end, and is a reduced tooth profile, in which the basic internal-teeth tooth profile is proportionally reduced only in the lateral direction, at other tooth-trace-direction positions. A three-dimensional tooth profile of external teeth is a basic external-teeth tooth profile at an external-teeth outer end, and is an increased tooth profile, in which the basic external-teeth tooth profile is proportionally increased only in the lateral direction, at other tooth-trace-direction positions. Tooth cutting process becomes easier than when only the external teeth employ a three-dimensional tooth profile. Since the tooth profiles, which are proportionally reduced and increased only in the lateral direction along the tooth trace direction, are employed, it is further easier in tooth cutting process.