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公开(公告)号：US10508729B2
公开(公告)日：2019-12-17
申请号：US15519650
申请日：2014-11-21
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Masaru Kobayashi
Abstract: A strain wave gearing device has a grease temperature control mechanism for controlling the grease temperature of a portion of grease, of the grease filled inside an externally toothed gear of the strain wave gearing device, the portion of the grease being disposed on the outer peripheral side portion of a wave generator. The grease temperature control mechanism has a circular heater facing the outer peripheral side portion of the wave generator over the entire circumference from a direction of a device central axis line. By controlling the grease temperature of a specified portion inside the externally toothed gear, it is possible to reliably start the strain wave gearing device even in an extremely low temperature environment where the grease solidifies.
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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
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
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公开(公告)号：US20190234502A1
公开(公告)日：2019-08-01
申请号：US16316461
申请日：2016-07-30
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Masaru KOBAYASHI
CPC classification number: F16H49/001 , F16C19/16 , F16C2361/61 , F16H1/32
Abstract: A wave generator of a strain wave gearing is provided with a rigid plug, a wave bearing mounted to the ellipsoidal outer peripheral surface of the rigid plug, and four elastic claws that rotate integrally with the rigid plug. The balls of the wave bearing include balls in a loose state and balls in a tight state. The loose-state balls adjacent to the tight-state balls are applied with braking force by the elastic claws immediately before they transition into a tight state, and the orbital motion thereof is temporarily prevented or suppressed, whereby the gaps between the loose-state balls and the adjacent tight-state balls are secured. It is possible to prevent increase in rotational torque, damage to the balls or other defects due to ball-to-ball contact by the tight-state balls.
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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
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.
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公开(公告)号：US10215259B2
公开(公告)日：2019-02-26
申请号：US15424090
申请日：2017-02-03
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio Shirokoshi
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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Patent Agency Ranking
公开(公告)号：US20190055985A1
公开(公告)日：2019-02-21
申请号：US16080818
申请日：2016-03-30
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Tsuguhisa Hagiwara , Yoshiji Nakazawa , Kazuhisa Taguchi , Kazuhiko Kurashina
Abstract: A combined cylindrical roller bearing is provided with first and second angular cylindrical roller bearings coaxially disposed in parallel, and a shim plate sandwiched between first and second inner races of these angular cylindrical roller bearings. A gap between the first and second inner races is adjusted by the shim plate. First and second cylindrical rollers do not have the relative positions thereof restricted in the direction of the bearing center axis line thereof. Pressurization of the first and second angular cylindrical roller bearings can be managed appropriately by the shim plate. Different from double-row angular cylindrical roller bearings, it is not required to raise the precision in processing and assembly of the inner and outer races to the tolerance level of cylindrical rollers, processing and assembly can be made easy, and cost can be reduced.
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公开(公告)号：US20180259053A1
公开(公告)日：2018-09-13
申请号：US15112467
申请日：2015-12-04
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi ISHIKAWA
CPC classification number: F16H49/001 , F16H1/32 , F16H3/70 , F16H55/08 , F16H55/0833
Abstract: In a strain wave gearing, the addendum tooth profile of an inner gear is defined by a formula and that of an outer gear is by another formula at a principal cross-section located at a tooth-trace-direction center of the outer gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the outer gear with respect to those of the inner gear. The tooth profiles of the dedenda of each of the inner gear and the outer gear are set to any shape that does not interfere with the tooth profile of the addendum of the other gear. It is possible to avoid superimposed flexion-induced bending stresses and tensile stresses caused by load torque arising at the long-axis locations of the outer gear, and the transmission torque capacity of a strain wave gearing can be improved.
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公开(公告)号：US10006534B2
公开(公告)日：2018-06-26
申请号：US14890605
申请日：2013-06-20
Applicant: Harmonic Drive Systems Inc.
Inventor： Yuya Murayama , Yoshihide Kiyosawa
CPC classification number: F16H49/001 , F16C25/083
Abstract: In this hollow strain wave gearing unit, a shaft end part of a hollow rotary shaft of a wave generator is located inside a cup-shaped flexible external gear. The shaft end part is supported by a bearing attached to a bearing holder that is fixed to a boss of the flexible external gear. In the bearing holder, an elastic leaf spring part that is displaceable in the axial direction constitutes a part that supports a holder body part that holds the bearing. A preload is applied by the leaf spring part to the bearing in the axial direction. Thus, there is no need to separately arrange a preload application member inside the flexible external gear, and the axial length of the hollow strain wave gearing unit can be shortened.
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269.发明授权公开(公告)号：US09903459B2
公开(公告)日：2018-02-27
申请号：US14892047
申请日：2014-07-11
Applicant: Harmonic Drive Systems Inc.
Inventor： Shoichi Ishikawa
CPC classification number: F16H49/001 , F16H55/08 , F16H55/0833 , F16H2049/003
Abstract: A strain wave gearing includes a rigid internally toothed gear, a flexible externally toothed gear disposed coaxially within the internally toothed gear, and a wave generator fitted within the externally toothed gear. The internally toothed gear and the externally toothed gear are spur gears having module m; and the number of teeth of the externally toothed gear is 2n less than the number of teeth of the internally toothed gear, where n is a positive integer. Taking a transverse cross-section at a prescribed position along a tooth trace direction of the external teeth as a main cross-section, a degree of flexing, with respect to a rim-neutral circle of the externally toothed gear prior to ellipsoidal flexing, of a rim-neutral line of the ellipsoidally flexed externally toothed gear is set, at a position on the major axis in the main cross-section, to 2mn.
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公开(公告)号：US20170370457A1
公开(公告)日：2017-12-28
申请号：US15542872
申请日：2015-01-13
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Masaru KOBAYASHI
CPC classification number: F16H49/001 , F16H1/32 , F16H57/0409 , F16H57/041 , F16H57/0417 , F16H57/0427 , F16H57/0471 , F16H57/0486
Abstract: An internal contact part of a wave generator of a strain wave gearing, a contact part between an externally toothed gear and the wave generator, and tooth surface parts are lubricated by a lubricating fine powder. When the strain wave gearing is in operation, the lubricating fine powder is supplied to the internal contact part and the contact part by a first powder guide that rotates integrally with the wave generator. Having passed through these sections, the lubricating fine powder is supplied to the tooth surface parts by a second powder guide that rotates integrally with the wave generator. Each component part can be reliably lubricated regardless of the orientation of the strain wave gearing during operation.
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