公开(公告)号：US10400667B2

公开(公告)日：2019-09-03

申请号：US15578506

申请日：2016-04-22

Applicant: NISSAN MOTOR CO., LTD. ,  HARMONIC DRIVE SYSTEMS INC. ,  HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Ryosuke Hiyoshi ,  Yoshiaki Tanaka ,  Yoshihide Kiyosawa ,  Jun Handa ,  Kishiro Nagai ,  Junichiro Onigata ,  Yoshihiko Yamada

IPC: F02B75/04 ,  F02B75/32 ,  F02D15/02 ,  F16H1/28 ,  F16H1/32

Abstract: A variable compression ratio mechanism for an internal combustion engine includes a gear reducer that varies an engine compression ratio. The gear reducer includes an input-side member connected to a rotation shaft of an actuator; an output-side member that transmits a reduced rotation of the actuator to the control shaft; a fixed member fixed to a housing of the actuator; and an intermediate member that transmits torque from the input-side member to the output-side member and the fixed member, and has a first gear portion engaged with the fixed member and a second gear portion engaged with the output-side member. A ratio of a number of teeth of the fixed gear portion to a number of teeth of the first gear portion is lower than a ratio of a number of teeth of the output-side gear portion to a number of teeth of the second gear portion.

公开(公告)号：US10295037B2

公开(公告)日：2019-05-21

申请号：US15327830

申请日：2015-07-03

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Yoshihide Kiyosawa ,  Jun Handa ,  Noboru Takizawa ,  XinYue Zhang

IPC: F16H49/00 ,  F16H1/32 ,  F16H55/12

Abstract: An externally toothed gear of a dual-type strain wave gearing is provided with first and second external teeth having different tooth numbers, and is flexed into an ellipsoidal shape by a wave generator. When the theoretical values of the radial flexing amounts at major-axis positions of the first and second external teeth flexed into the ellipsoidal shape are expressed by d1=m1n1 and d2=m2n2 (m1 and m2 represent the modules of the first and second external teeth, and n1 and n2 represent positive integers), the radial flexing amount of the first and second external teeth flexed by the wave generator satisfies d=(d1+d2)/ω(1.4≤ω≤2.6). Accordingly, a dual-type strain wave gearing can be achieved with which the first and second external teeth having different numbers can be suitably flexed to form excellent mating states with respective internally toothed gears.

公开(公告)号：US10253862B2

公开(公告)日：2019-04-09

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: F16H35/00 ,  F16H49/00 ,  F16H1/32 ,  F16C19/08

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)

公开(公告)号：US10197145B2

公开(公告)日：2019-02-05

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: F16H1/32 ,  F16H49/00 ,  F16C19/06

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：US12215768B2

公开(公告)日：2025-02-04

申请号：US18164856

申请日：2023-02-06

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Kazumasa Furuta ,  Nozomu Tanioka ,  Jun Handa

IPC: F16H49/00

Abstract: In a strain wave gearing, both of a pulley for transmitting rotation in a direction orthogonal to a rotation central axis and an output shaft are arranged on an axial-direction first side relative to a cup-shaped externally toothed gear. The input shaft, which transmits input rotation from the pulley to the wave generator, functions as a support shaft for both the pulley and the wave generator and is supported at both ends by the first and second bearings. A mechanism for transmitting rotation from the pulley to the wave generator, and a mechanism for supporting the rotation-transmitting mechanism, can be made compact, and support strength can also be ensured.

公开(公告)号：USD971978S1

公开(公告)日：2022-12-06

申请号：US35511524

申请日：2020-09-09

Applicant: HARMONIC DRIVE SYSTEMS INC.

Designer： Hiroaki Kimura ,  Yoshihide Kiyosawa ,  Jun Handa

公开(公告)号：USD937332S1

公开(公告)日：2021-11-30

申请号：US35511076

申请日：2020-06-30

Applicant: HARMONIC DRIVE SYSTEMS INC.

Designer： Hiroaki Kimura ,  Jun Handa ,  Yoshihide Kiyosawa

公开(公告)号：US11028915B2

公开(公告)日：2021-06-08

申请号：US15781751

申请日：2015-12-11

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Jun Handa ,  Hiroaki Kimura ,  Sotaro Miyake

IPC: F16H1/32 ,  F16H49/00 ,  F16H57/021

Abstract: A restraint mechanism for limiting the movement of the flexible external gear of a flat strain wave gearing in the axial direction has a first restraining member installed in a floating state in a first recess and a second restraining member installed in a floating state in a second recess. The restraining member is able to limit the movement of the flexible external gear in the axial direction to a range in which there are no difficulties during actual use. Moreover, compared with when movement of the flexible external gear is limited using members that are disposed at fixed positions, it is possible to reduce the sliding abrasion that occurs between the flexible external gear and the first and second restraining members.

公开(公告)号：US11002349B2

公开(公告)日：2021-05-11

申请号：US15738172

申请日：2015-07-07

Applicant: Harmonic Drive Systems Inc.

Inventor： Jun Handa ,  Hiroaki Kimura ,  Sotaro Miyake

IPC: F16H1/32 ,  F16H35/10 ,  F16H49/00

Abstract: In a rotation transmission mechanism that transmits the rotational driving force of a motor to a load-side member via a speed reducer, a strain wave gearing is used as the speed reducer, and the allowable load torque of members in the powertrain other than the strain wave gearing is greater than a predetermined upper-limit load torque. The allowable load torque of the strain wave gearing is dictated by the ratcheting torque, which is set so as not to exceed the upper-limit load torque. In an overload state, ratcheting is generated in the strain wave gearing, so that the strain wave gearing functions as a mechanical fuse. Other power transmission members can be protected from an overload state without adding a separate member such as a torque limiter.

公开(公告)号：US10393227B2

公开(公告)日：2019-08-27

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: F16H49/00 ,  F16H1/32 ,  F16H3/70 ,  F16H57/02 ,  F16H55/08

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