公开(公告)号：US20170219050A1

公开(公告)日：2017-08-03

申请号：US15500605

申请日：2014-08-06

Applicant: Harmonic Drive Systems Inc.

Inventor： Jun HANDA ,  Yoshihide KIYOSAWA ,  Noboru TAKIZAWA ,  Xin Yue ZHANG

IPC: F16H1/32 ,  F16H49/00

CPC classification number: F16H1/32 ,  F16H3/70 ,  F16H49/001 ,  F16H55/0833 ,  F16H57/02 ,  F16H2049/003

Abstract: A relieving portion is formed between a first external tooth portion and a second external tooth portion in the external teeth of a flexible externally toothed gear of a flat strain wave gearing. The length L1 of the relieving portion in the tooth trace direction is within the range of 0.1 to 0.5 of the tooth width L of the external teeth. The maximum relieving amount t from the tooth top land of an external tooth in the relieving portion is 3.3×10−4

公开(公告)号：US20170175869A1

公开(公告)日：2017-06-22

申请号：US15322664

申请日：2015-07-03

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Yoshihide KIYOSAWA ,  Jun HANDA ,  Noboru TAKIZAWA ,  Xin Yue ZHANG

IPC: F16H49/00 ,  F16C19/08

CPC classification number: F16H49/001 ,  F16C19/08 ,  F16C2361/61 ,  F16H1/32 ,  F16H2049/003

Abstract: An externally toothed gear of a dual-type strain wave gearing is provided with first and second external teeth having different teeth numbers, and is flexed into an ellipsoidal shape by a wave generator. When t(1) represents the tooth bottom rim wall thickness of the first external teeth, and t(2) represents the tooth bottom rim wall thickness of the second external teeth, the ratio of t(1)/t(2) is set to a value satisfying 0.5>t(1)/t(2)