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公开(公告)号：US20170314671A1
公开(公告)日：2017-11-02
申请号：US15166540
申请日：2016-05-27
Applicant: Harmonic Drive Systems Inc.
Inventor： Norio SHIROKOSHI
CPC classification number: F16H57/0464 , F16H57/04 , F16H57/0479 , F16H57/0486 , F16H57/08 , F16H2057/085
Abstract: A planetary gear drive has needle roller bearings of full roller type as planetary gear bearings for planetary gears. The needle roller bearings have lubrication mechanisms, respectively. Each lubrication mechanism has an annular grease retaining groove. The grease retaining groove is formed on an inner peripheral surface (an outer-race-side raceway surface) of the shaft hole of each planetary gear. Poor lubrication can be prevented from occurring when needle roller bearings of full roller type are employed as the planetary gear bearings.
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公开(公告)号：US20200232549A1
公开(公告)日：2020-07-23
申请号：US16633391
申请日：2017-08-21
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: A cup-shaped strain wave gearing has an externally toothed gear formed with a cylindrical extension portion extending from an end of an external tooth forming portion of the externally toothed gear. A space between the external peripheral surface of the cylindrical extension portion and an end face of an internally toothed gear is sealed by an oil seal. A space between an outer-side lubrication portion on the outer side of the externally toothed gear and an inner-side lubrication portion on the inner side of the externally toothed gear is blocked by a lubricant-mixing-prevention part configured from the cylindrical extension portion and the oil seal. The mixing of different types of lubricants supplied to the outer-side and inner-side lubrication portions can be effectively prevented.
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公开(公告)号：US20190368576A1
公开(公告)日：2019-12-05
申请号：US16476587
申请日：2017-10-19
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI , Yuya MURAYAMA , Yoshitomo MIZOGUCHI , Satoshi KISHI
Abstract: A strain wave gearing wherein the tooth profile of an external teeth of a cup-shaped or silk-hat-shaped external gear is set as follows. The tooth-tip tooth thickness decreases gradually from an external-teeth outer end toward an external-teeth inner end along an external tooth trace direction. In addition, a pressure angle at a pitch point (P) increases gradually from the external-teeth outer end toward the external-teeth inner end along the external tooth trace direction. Thus, it is possible to realize a cup-type or silk-hat-type strain wave gearing in which external teeth mesh with internal teeth in a wide range along the tooth trace direction, rather than only in one cross-section perpendicular to the axis in the tooth trace direction.
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公开(公告)号：US20190353236A1
公开(公告)日：2019-11-21
申请号：US16477227
申请日：2017-12-08
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
IPC: F16H49/00
Abstract: A strain wave gearing has a rigid internally toothed gear, a flexible externally toothed gear, and a wave generator. Before being flexed by the wave generator, the externally toothed gear has a cylindrical body part, an inside diameter of which is such that the inside diameter D is smallest at a rear end thereof and increases gradually from the rear end to an opening end thereof. After being flexed by the wave generator, D1≤D is satisfied where D1 is the minor diameter of an elliptical inner circumferential surface of the opening end of the cylindrical body part. The externally toothed gear, which is provided with such a tapered cylindrical body part, is suitable for manufacturing by die molding such as casting, and can also alleviate excessive uneven contact thereof with a wave bearing.
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公开(公告)号：US20160319927A1
公开(公告)日：2016-11-03
申请号：US14797305
申请日：2015-07-13
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
CPC classification number: F16H57/082 , F16C19/163 , F16C19/36 , F16C19/54 , F16C19/548 , F16H1/28
Abstract: A planetary gear reducer has a planetary carrier supported by an input-side main bearing and an output-side main bearing. An angular contact ball bearing or a deep groove ball bearing which requires less installation space and is inexpensive is used for the input-side main bearing. A tapered roller bearing having a large capacity is used for the output-side main bearing. A compact, flat and inexpensive planetary gear reducer can be realized in comparison with a case in which the both main bearings are tapered roller bearings.
Abstract translation: 行星齿轮减速器具有由输入侧主轴承和输出侧主轴承支承的行星架。 输入侧主轴承使用角接触球轴承或深沟球轴承，其需要较少的安装空间并且便宜。 输出侧主轴承使用具有大容量的圆锥滚子轴承。 与两个主轴承是圆锥滚子轴承的情况相比，可以实现紧凑，扁平和便宜的行星齿轮减速器。
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Patent Agency Ranking
公开(公告)号：US20250015549A1
公开(公告)日：2025-01-09
申请号：US18713406
申请日：2022-01-12
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: A shaft member, in which electrical wiring and connectors are integrally formed, is disposed on a hollow portion for electrical wiring that extends through the center of a wave gear device. The connectors attached to first and second shaft ends on both sides of the shaft member are each exposed to outside from both ends of the hollow portion. During wiring work, external wiring or the like need merely be attached to respective terminals of the connectors exposed to outside. It is possible to reduce the risk of disconnection caused by sliding or twisting of the electrical wiring, without the electrical wiring contacting a hollow input shaft forming the hollow portion, an end of a second end plate, etc. Constraints on the number of wires and wire diameter are also alleviated, and wiring work also becomes simple.
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公开(公告)号：US20230349458A1
公开(公告)日：2023-11-02
申请号：US17639603
申请日：2020-10-30
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
CPC classification number: F16H49/001 , F16H55/0833 , 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. The tooth tip circle of an internal-teeth inner-end-side portion of the internal teeth is larger than that of other portions and does not interfere with the external teeth. The external teeth and the internal teeth mesh three-dimensionally, the teeth do not interfere at the internal-teeth inner-end side.
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公开(公告)号：US20210364077A1
公开(公告)日：2021-11-25
申请号：US16982086
申请日：2018-05-14
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI , Takeo KODAIRA , Hiroshi YAMAZAKI
Abstract: The tooth profile contours of a rigid internally toothed gear and a flexible externally toothed gear in this strain wave gearing are stipulated by: meshing portions which each mesh with the opposing gear; tooth-crest-side convex surface portions which, respectively, are smoothly connected to the addendum-side ends of the meshing portions and extend from said ends to the apices of the tooth crests; and tooth-bottom-side concave surface portions which, respectively, are smoothly connected to the dedendum-side ends of the meshing portions and extend from said ends to the deepest parts of the tooth bottoms. The meshing portions and tooth-crest-side convex surface portions are machined portions that are simultaneously machined by topping gear cutting, and there are no edges on the teeth of either gear on the tooth-crest side.
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公开(公告)号：US20210222769A1
公开(公告)日：2021-07-22
申请号：US16768985
申请日：2018-11-09
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Norio SHIROKOSHI
Abstract: When a strain wave gearing is used in an application for an operation of repeating startup/stopping, an outer-side lubrication portion and an inner-side lubrication portion, which are lubricated using different types of grease, remain in a communicating state without being divided using a seal member or the like. The outer-side lubrication portion is supplied with a much smaller amount of grease than the amount that would be required if used in an application such as a steady operation. Similarly, the inner-side lubrication portion is also supplied with a much smaller amount of grease than the amount that would be required if used in an application such as a steady operation. Essentially, the outer-side lubrication portion and the inner-side lubrication portion can be lubricated appropriately using different types of grease, without the grease becoming mixed.
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公开(公告)号：US20210140531A1
公开(公告)日：2021-05-13
申请号：US17256774
申请日：2018-08-30
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Syuhei KOBAYASHI , Daisuke ORII , Norio SHIROKOSHI , Hiroshi YAMAZAKI
Abstract: In a wave generator for a strain wave gearing, a plug outer peripheral surface of a rigid wave plug has a non-circular profile and is fixed to an inner-race inner peripheral surface of a wave bearing by press-fitting and using an adhesive. The plug outer peripheral surface is a groove formation surface in which microgrooves are formed as adhesive-retaining grooves that can retain the adhesive. When the wave plug is press-fitted into the wave bearing, the amount of adhesive that is scraped out from therebetween is reduced and the bonding strength therebetween can be increased while also preventing unevenness of the bonding strength.
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