公开(公告)号：US20190203819A1

公开(公告)日：2019-07-04

申请号：US15322640

申请日：2015-07-03

Applicant: HARMONIC DRIVE SYSTEMS INC.

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

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

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

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 a gap formed between these teeth as a cutter clearance area for tooth cutters. The maximum width L1 of the gap is 0.1 to 0.3 times the width L of the externally toothed gear. The depth from the tooth top land of the first external teeth to the deepest part of the gap is 0.9 to 1.3 times the depth of the first external teeth, and the depth from the tooth top land of the second external teeth to the deepest part of the gap is 0.9 to 1.3 times the depth of the second external teeth. The tooth bottom fatigue strength of the externally toothed gear provided with differing numbers of first and second external teeth is increased.

公开(公告)号：US20170198802A1

公开(公告)日：2017-07-13

申请号：US15327750

申请日：2015-07-03

Applicant: HARMONIC DRIVE SYSTEMS INC.

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

IPC: F16H49/00 ,  F16C19/06

CPC classification number: F16H49/001 ,  F16C19/06 ,  F16C2370/00 ,  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. The first and second external teeth are flexed by a wave generator by the same flexing amount, into an ellipsoidal shape. The average pressure angle of main-tooth-surface sections of tooth profiles of the first external teeth having a low teeth number is less acute than the average pressure angle of main-tooth-surface sections of tooth profiles of the second external teeth having a high teeth number. Accordingly, a dual-type strain wave gearing can be achieved with which the first and second external teeth having different teeth numbers can be suitably flexed to form excellent meshing states with respective internally toothed gears.

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)