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公开(公告)号：US20230330763A1
公开(公告)日：2023-10-19
申请号：US18027153
申请日：2020-12-28
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
IPC: B23F5/16
CPC classification number: B23F5/163
Abstract: In a gear skiving process method, a tooth-cutting process is performed on a surface to be cut of a workpiece using a first skiving cutter disposed at a first processing position on the surface to be cut and a second skiving cutter disposed at a second processing position set apart by 180° in a circumferential direction from the first processing position. Parts that are to be right tooth flanks of internal teeth to be created in the surface to be cut of the workpiece are cut mainly by the first skiving cutter. Additionally, parts that are to be left tooth flanks are cut mainly by the second skiving cutter. Conditions of the processing performed using the first and second skiving cutters can be controlled individually and teeth having a shape in which the left and right tooth flanks are different can be processed efficiently.
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公开(公告)号：US20210372515A1
公开(公告)日：2021-12-02
申请号：US17282077
申请日：2018-11-22
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Daisuke ORII , Syuhei KOBAYASHI , Norio SHIROKOSHI , Hiroshi YAMAZAKI
Abstract: An outer-ring lubrication groove pattern formed in an outer-race raceway surface and an inner-race lubrication groove pattern formed in an inner-race raceway surface of a wave generator bearing of a strain wave gearing device are patterns in which linear lubrication grooves having very small widths and depths of several micrometers or less are arranged at fine pitches of several micrometers or less. The inner-race lubrication groove pattern includes a second groove pattern formed in long-axis-side inner-race raceway surface portions to hold the lubricant, and a first groove pattern formed in short-axis-side inner-race raceway surface portions to hold the lubricant and guide the lubricant to the second groove pattern. This configuration improves the contact state between balls and the inner-race and outer-race raceway surfaces of the wave generator bearing, thus reducing the coefficient of friction therebetween.
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公开(公告)号：US20170227091A1
公开(公告)日：2017-08-10
申请号：US15424090
申请日：2017-02-03
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
CPC classification number: F16H1/28 , F16H1/46 , F16H57/08 , F16H57/082
Abstract: A planetary reduction gear device has first and second planetary gears meshed with a sun gear and an internal at different locations in a direction of an axis line; and a carrier assembly for supporting the first and second planetary gears. The carrier assembly has a first planetary carrier for supporting the first planetary gears and a second planetary carrier for supporting the second planetary gears. The first and second planetary carriers are fixed coaxially with each other in the direction of the axis line so as to rotate integrally. A planetary reduction gear device having a large torque capacity can be obtained.
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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.
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公开(公告)号：US20210140529A1
公开(公告)日：2021-05-13
申请号：US16629327
申请日：2017-08-09
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: A strain wave gearing wherein the outer circumferential surface of an outer ring of a wave generator is in contact with an inner-circumferential-surface portion of a flexible externally toothed gear, and a release groove, which is not in contact with the outer circumferential surface, is formed in the inner-circumferential-surface portion. The release groove is formed in a region containing a ball raceway groove. The groove depth of the release groove gradually increases from both sides of the groove in the groove width direction toward a deepest portion of the groove provided at an intermediate portion in the groove width direction. By providing the release groove, it is possible to smooth the distribution of pressing force of the wave generator acting on the externally toothed gear in the tooth-trace direction. In addition, the tooth root fatigue strength and the transmission torque capacity of the externally toothed gear can be improved.
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Patent Agency Ranking
公开(公告)号：US20200173532A1
公开(公告)日：2020-06-04
申请号：US16640197
申请日：2017-09-07
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: A strain wave gearing has a wave generator that is provided with a rigid cam plate and a wave bearing. The wave bearing is mounted between the elliptical outer peripheral surface of the rigid cam plate and the inner peripheral surface of an externally toothed gear so as to support the rigid cam plate and the externally toothed gear in a relatively rotatable state. The wave bearing is a full complement ball bearing provided with inner and outer races which are flexible in a radial direction. Since the wave bearing is not provided with a retainer and the number of balls inserted in a ball raceway is not restricted by partition walls of such a retainer, the maximum number of balls can be mounted. Thus, the wave bearing with a large load capacity can be realized, and reliability during high-load operation of the strain wave gearing is enhanced.
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公开(公告)号：US20250043861A1
公开(公告)日：2025-02-06
申请号：US18717418
申请日：2022-01-18
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: In each of tooth tip surfaces of internal teeth of an internally toothed gear and external teeth of an externally toothed gear of a strain wave gearing, lubricant passage grooves are formed at fixed intervals along the tooth trace direction. Each of the lubricant passage grooves is an inclined groove that extends in a direction inclined to one side in the tooth trace direction. The inclined grooves facilitate the flow of the lubricant such as grease confined in gaps between the internal teeth and the external teeth and thus the lubricant is efficiently supplied to the tooth surfaces of both teeth.
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公开(公告)号：US20220333673A1
公开(公告)日：2022-10-20
申请号：US17289066
申请日：2020-01-08
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: An externally toothed gear of a cup-type strain wave gearing has external teeth, the tooth profile of which gradually changes in the tooth-trace direction. The external teeth are formed with an external teeth portion capable of meshing with internal teeth of an internally toothed gear, a first external teeth extension portion and a second external teeth extension portion, in which the first and second external teeth extension portions do not mesh with the internal teeth. The second external teeth extension portion has a narrowing tapered tooth profile so that the second external teeth extension portion serves as a guide when the external teeth is inserted into the internal teeth. The work of assembling the externally toothed gear in the internally toothed gear is made easier.
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公开(公告)号：US20210341048A1
公开(公告)日：2021-11-04
申请号：US17282055
申请日：2018-11-22
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Daisuke ORII , Syuhei KOBAYASHI , Norio SHIROKOSHI , Hiroshi YAMAZAKI
Abstract: In a strain wave gearing device, fine first and second lubricant-holding grooves for holding lubricant are formed at fine pitches in an outer-race external peripheral surface of a wave generator bearing and an outer-race-contacting internal peripheral surface portion of an externally toothed gear in contact therewith. Fine lubricant-guiding grooves for guiding the lubricant to the outer-race-contacting internal peripheral surface portion are formed at fine pitches in a second internal peripheral surface portion, which adjoins the outer-race-contacting internal peripheral surface portion, of an internal peripheral surface of the externally toothed gear. This configuration improves the contact state between the outer-race-contacting internal peripheral surface portion of the externally toothed gear and the outer-race external peripheral surface, thus suppressing fretting wear occurring in these surfaces.
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公开(公告)号：US20200240500A1
公开(公告)日：2020-07-30
申请号：US16754030
申请日：2017-10-31
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Yoshihide KIYOSAWA , Norio SHIROKOSHI
IPC: F16H49/00 , F16H57/021 , F16C17/04
Abstract: A cup-type strain wave gearing having a unit structure and having: a stationary-side part including a unit housing and an internally toothed gear; a driving-side part including an output member and an externally toothed gear; and a sliding bearing supporting the stationary-side part and the driving-side part in the radial direction and the thrust direction in a state in which relative rotation is possible. The sliding bearing has a cylindrical bushing accommodated in a radial gap, and annular bushings accommodated respectively in thrust gaps. Thus, it is possible to provide an advantageous strain wave gearing having a unit structure that is more lightweight and compact than when a rolling bearing is used.
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