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公开(公告)号：US12209648B2
公开(公告)日：2025-01-28
申请号：US18549650
申请日：2021-06-01
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Yuya Murayama
Abstract: According to a tooth profile designing method for a strain wave gear device, a first curve from a point A (φ=0) to a point B (φ=π/2) in a moving locus of external teeth with respect to internal teeth is extracted. A similarity curve is obtained by multiplying the first curve by (1−λ) using the point B as a center of similarity, and a second curve is obtained by rotating the similarity curve by 180° about a midpoint C between the point A and the point B as a center of similarity. A third curve is obtained by multiplying only the x-coordinate of the second curve by α (α 1). An addendum tooth profile of the external teeth is defined using the third curve or the fourth curve.
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公开(公告)号：US20250003476A1
公开(公告)日：2025-01-02
申请号：US18678959
申请日：2024-05-30
Applicant: Sunstar Singapore Pte. LTD.
Inventor： Wey Chin TAN , Chee Onn LEONG
Abstract: A sprocket capable of suppressing mud intrusion is provided. The sprocket 1 according to one embodiment is a sprocket 1, which includes a plurality of teeth and a mud discharge groove 30 that is formed to partially reduce the plate thickness and opens into the region including the tooth root center (Pbc) and the tooth tip center (Ptc) on the trailing side in the rotational direction.
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公开(公告)号：US20240401673A1
公开(公告)日：2024-12-05
申请号：US18658948
申请日：2024-05-08
Inventor： Bingkui CHEN , Chao TIAN , Luhe ZHANG , Changyan PENG , Wenjun LUO , Chaoyang LI , Yonghong CHEN
Abstract: Provided is a herringbone planetary gear transmission device with a constant meshing characteristics constructed tooth pair, which relates to the technical field of gear transmission. The transmission device includes a sun gear with a constructed tooth pair, a planetary gear with a constructed tooth pair and an internal gear with a constructed tooth pair based on conjugate curves. Normal tooth profiles of the gears with a constructed tooth pair in the present disclosure are all the same combined curve and can be machined by using the same cutter. A common normal at an inflection point or a tangent point of the curve passes through a pitch point of a meshing gear pair, and a sliding ratio of the meshing gear pair is adjusted according to an adjusted position of the inflection point or the tangent point. A contact ratio of the meshing gear pair is designed as an integer.
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公开(公告)号：US20240352996A1
公开(公告)日：2024-10-24
申请号：US18682817
申请日：2022-04-26
Applicant: TIANJIN UNIVERSITY
Inventor： Yuhu YANG , Ran XIE , Guocheng ZHOU , Zhaoguang SHEN
CPC classification number: F16H49/001 , F16H55/0833 , F16H2049/003
Abstract: The present disclosure discloses a harmonic reducer with conjugate cycloidal profiles, including a circular spline, a flexspline, a wave generator and a flexible bearing. A profile of the circular spline and a profile of the flexspline are conjugate cycloidal profiles. The profile of the circular spline and the profile of the flexspline are formed by hypocycloids and epicycloids formed by two rolling circles around a pitch circle of the circular spline and a pitch circle of the flexspline under an engaging state respectively. A sum of radii of the first rolling circle and the second rolling circle is equal to a difference between radii of the pitch circle of the circular spline and the pitch circle of the flexspline under the engaging state. The wave generator is a biarc cam wave generator, a cam curve is an arc within an angle of contact in the long axis direction.
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公开(公告)号：US12013022B2
公开(公告)日：2024-06-18
申请号：US17740558
申请日：2022-05-10
Applicant: Miba Sinter Austria GmbH
Inventor： Horst Roessler , Martin Ohler , Helmut Aichinger , Alexander Mueller
IPC: F16H55/17 , B22F3/16 , B22F3/24 , B22F5/08 , C22C38/44 , C23C8/26 , C23C8/32 , C23C8/38 , F16H55/06 , F16H55/08
CPC classification number: F16H55/17 , B22F3/16 , B22F3/24 , B22F5/08 , C22C38/44 , C23C8/26 , C23C8/32 , C23C8/38 , F16H55/06 , F16H55/08 , B22F2301/35 , F16H2055/176
Abstract: A method for producing a sintered component, in particular an annular sintered component, with a toothing, having teeth with tooth roots, tooth tips and tooth flanks, includes the steps of pressing a powder to form a green compact, sintering the green compact, and hardening the sintered component, wherein after sintering, the tooth flanks and possibly the tooth tips are post-compacted and subsequently undergo post-processing by machining, and wherein a transition region between the tooth flanks and the tooth roots has an undercut design, and post-compaction of the tooth flanks is carried out only up to this transition region.
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Patent Agency Ranking
公开(公告)号：US20240167556A1
公开(公告)日：2024-05-23
申请号：US18271323
申请日：2021-01-15
Applicant: MUSASHI SEIMITSU INDUSTRY CO., LTD.
Inventor： Shiryu KATOH , Shinya MATSUOKA
Abstract: In a gear pair in which a first gear and a second gear having a larger number of teeth than the first gear share a meshing line (L) of teeth that mesh with each other, at least a part of the meshing line (L) includes a region where a pressure angle (a) is not constant, and the pressure angle (α) weakly increases in a section of the meshing line (L) from a pitch point (Pp) to an end point (Pe1) on a tooth-root side of the first gear (G1). This allows both desired properties (for example, strength) and smooth meshing to be achieved, and also allows effective increase in strength of the tooth-root side of the gear having the small number of the teeth (that is, the first gear) subject to a large load and susceptible to damages on the tooth-root side.
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公开(公告)号：US20240159306A1
公开(公告)日：2024-05-16
申请号：US18054598
申请日：2022-11-11
Applicant: GM Global Technology Operations LLC
Inventor： Cheonjae Bahk , Bo Li , Dhanasekar Baladhandapani , Pavan Kumar Patruni , Hung-yih Isaac Du
CPC classification number: F16H55/0886 , F16H55/17
Abstract: A multi-slot gear for a powertrain of a vehicle includes an inner ring, an outer ring having gear teeth disposed on a periphery of the outer ring, a web disposed between the inner ring and the outer ring, and a plurality of slots disposed within the web. Each of the plurality of slots includes a slot angle and each of the plurality of slots is separated from one another by a space angle. The ratio of the slot angle to the space angle is greater than two.
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公开(公告)号：US20240159305A1
公开(公告)日：2024-05-16
申请号：US18549650
申请日：2021-06-01
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Yuya MURAYAMA
CPC classification number: F16H49/001 , F16H55/0833
Abstract: According to a tooth profile designing method for a strain wave gear device, a first curve from a point A (φ=0) to a point B (φ=τ/2) in a moving locus of external teeth with respect to internal teeth is extracted. A similarity curve is obtained by multiplying the first curve by (1−λ) using the point B as a center of similarity, and a second curve is obtained by rotating the similarity curve by 180° about a midpoint C between the point A and the point B as a center of similarity. A third curve is obtained by multiplying only the x-coordinate of the second curve by α (α 1). An addendum tooth profile of the external teeth is defined using the third curve or the fourth curve.
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公开(公告)号：US20240125374A1
公开(公告)日：2024-04-18
申请号：US18016805
申请日：2022-05-11
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Siying LING , Ming LING , Heng ZHANG , Fengtao WANG
CPC classification number: F16H1/16 , F16H55/0806 , F16H55/22 , F16H2057/0087
Abstract: The present invention belongs to the field of mechanical transmission technology, and proposes a non-orthogonal elliptical toroidal worm gear pair, including an involute cylindrical gear and an elliptical toroidal worm formed by a primary envelope of the involute cylindrical gear; both adopt spatial non-orthogonal transmission, and the shaft angle satisfies the self-locking condition and the restriction condition of minimum tooth top width; the toroidal generatrix of the elliptical toroidal worm is elliptical, which can increase the number of meshing teeth and the total length of instantaneous contact line. A non-orthogonal elliptical toroidal worm gear pair proposed in this invention has the characteristics of toroidal worm drive and can realize the whole facewidth of the gear to participate in the meshing drive. It can be used in the fields of precision continuous indexing transmission, continuous lapping of cylindrical gear tooth flank, and has good popularization application value and industrialization prospect.
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公开(公告)号：US11959539B2
公开(公告)日：2024-04-16
申请号：US18262378
申请日：2021-11-18
Applicant: KABUSHIKI KAISHA RIKEN
Inventor： Satoru Fujita , Kazuo Ishizuka , Tomoki Shirasawa , Ryo Kamiyama
CPC classification number: F16H55/0833 , F16H49/001 , F16H55/06
Abstract: It is included an internal gear (2), an external gear (3) having flexibility, and a wave generator (4) that forms a meshing part (P) with the internal gear (2) in the external gear (3) and moves the meshing part (P) in a circumferential direction of the internal gear (2). The wave generator (4) is configured such that the meshing part (P) is formed at three or more positions in a circumferential direction of the external gear (3). A value (DpF/ZF) obtained by dividing a working pitch diameter DpF of the external gear (3) by the number of teeth ZF is greater than a value (DpR/ZR) obtained by dividing a working pitch diameter DpR of the internal gear (2) by the number of teeth ZR.
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