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公开(公告)号：US10989292B2
公开(公告)日：2021-04-27
申请号：US16603405
申请日：2017-04-28
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Naoki Kanayama
IPC: F16H49/00
Abstract: A wave generator of a wave gear device flexes an externally toothed gear into a shape along an elliptical closed curve to form engaging portions of the externally toothed gear with an internally toothed gear at two places, namely at both ends of the major axis, and to move the engaging portions in the circumferential direction. The elliptical closed curve has a non-point symmetric shape. For example, the elliptical closed curve is a line symmetric closed curve that is not symmetric about the minor axis, and is symmetric about only the major axis. In the non-point symmetric state, the engaging portions are formed at both ends in the major axis direction. By selecting different shapes for the engaging portions at the two locations of the major axis, vibration attributed to a secondary angular transmission error component generated along with the rotation of the wave generator can be reduced.
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公开(公告)号：US10788114B2
公开(公告)日：2020-09-29
申请号：US15995363
申请日：2018-06-01
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Shoichi Ishikawa
Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.
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公开(公告)号：US10400666B2
公开(公告)日：2019-09-03
申请号：US15578432
申请日：2016-04-22
Inventor： Ryosuke Hiyoshi , Yoshiaki Tanaka , Yoshihide Kiyosawa , Jun Handa , Kishiro Nagai , Junichiro Onigata , Yoshihiko Yamada
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 the 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 higher than a ratio of a number of teeth of the output-side gear portion to a number of teeth of the second gear portion.
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公开(公告)号：US20190234504A1
公开(公告)日：2019-08-01
申请号：US16320520
申请日：2016-09-30
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Naoki KANAYAMA , Toru TAKEDA
Abstract: A magnetic type rotation transmitting mechanism has a rotating plate made of a magnetic material, and a magnet to which the rotational movement of the rotating plate is transmitted through a magnetic coupling between the magnet and the rotating plate. When the rotating plate is rotated, a plurality of oblique edge portions formed on the outer peripheral edge of the rotating plate rotate while sequentially passing through a magnet-facing area. The oblique edge portions move in the direction of the rotation centerline of the rotating plate, the rotation centerline being perpendicular to the center axis line of the magnet. The magnet is rotated about the center axis line by a magnetic force occurring between the magnet and the oblique edge portions passing through the magnet-facing area. It is possible to realize a small and compact mechanism for extracting rotation.
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公开(公告)号：US10352426B2
公开(公告)日：2019-07-16
申请号：US15033815
申请日：2015-05-29
Applicant: Harmonic Drive Systems Inc.
Inventor： Masaru Kobayashi , Tatsuro Hoshina
Abstract: A flat strain wave gearing (1) has a mechanism for preventing a flexible externally toothed gear (4) from moving in the direction of the device center axis (1a) with respect to a rigid internally toothed gears (2, 3). The mechanism has an inner-peripheral groove (11) formed on inner teeth (3a) of the internally toothed gear (3), an outer-peripheral groove (12) formed on outer teeth (4a) of the externally toothed gear (4), and a flexible ring (13) mounted between the inner-peripheral groove (11) and the outer-peripheral groove (12). The ring (13) is engageable with groove inner-peripheral surfaces (11a, 11b, 12a, 12b), from the direction of the device center axis (1a), at meshing positions of the both gears (2, 4).
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Patent Agency Ranking
公开(公告)号：US10309513B2
公开(公告)日：2019-06-04
申请号：US15327866
申请日：2015-07-03
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Yoshihide Kiyosawa , Jun Handa , Noboru Takizawa , XinYue Zhang
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 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 amounts of the first and second external teeth flexed by the wave generator satisfy d1a=ωd1 and d2a=ωd2, where 1.25≤ω≤3. 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.
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公开(公告)号：US10309453B2
公开(公告)日：2019-06-04
申请号：US16064261
申请日：2015-12-21
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Yuya Murayama , Naoki Kanayama
Abstract: The roller insertion groove of the inner ring of a crossed roller bearing is provided with an outer circumferential surface-side groove opening that is exposed to an inner rings-side V-groove. The groove opening is defined by circumferential direction opening edge that extends in the circumferential direction along the inner ring-side V-groove and side opening edges that extend from both ends of the circumferential direction opening to the ring-shaped end face of the inner ring. Concentration of stress occurs in the corners between the circumferential direction opening edges and the side opening edges. The circumferential direction opening edge is formed so as not to coincide with the minimum outer diameter section of the inner ring-side V-groove.
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公开(公告)号：US10253863B2
公开(公告)日：2019-04-09
申请号：US15327841
申请日：2015-07-03
Applicant: Harmonic Drive Systems Inc.
Inventor： Yoshihide Kiyosawa , Jun Handa , XinYue Zhang , Noboru Takizawa
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 tooth depth of tooth profiles of the first external teeth having a low teeth number is smaller than the tooth depth of tooth profiles of the second external teeth having a high teeth number. 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.
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公开(公告)号：US10236747B2
公开(公告)日：2019-03-19
申请号：US15484357
申请日：2017-04-11
Applicant: Harmonic Drive Systems Inc.
Inventor： Tomoki Terashima , Kiyoto Kobayashi , Sachio Oshima
IPC: F16H49/00 , H02K7/116 , F16H57/04 , H02K9/00 , H02K5/20 , H02K9/22 , H02K5/08 , H02K9/10 , H02K9/19
Abstract: A strain wave gearing with a built-in motor is provided with a motor, a wave gear mechanism enclosing the motor coaxially, and a heat-insulation spacing formed therebetween. The wave gear mechanism has a wave generator attached to the motor rotor so as to rotate integrally with the motor rotor. A wave generator plug of the wave generator is fixed to a rotor magnet back yoke of the motor rotor so as to enclose the rotor magnet back yoke. The spacing is formed in a contact surface portion between the rotor magnet back yoke and the wave generator back yoke, whereby heat transfer from the motor to the wave gear mechanism is suppressed.
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公开(公告)号：US20190068043A1
公开(公告)日：2019-02-28
申请号：US16073169
申请日：2016-02-02
Applicant: HARMONIC DRIVE SYSTEMS INC.
Inventor： Toshiki MARUYAMA
IPC: H02K41/035 , H02K11/21 , G02B7/04
Abstract: A linear motor includes a motor movable body which has symmetrical structure with respect to a vertical plane and a horizontal plane that include the motor center axis line. Two linear bearings disposed in a space on the inner side of a rectangular tubular movable coil of the motor movable body are disposed symmetrically to the left and right of the center axis line so that the bearing support center coincides with the motor center axis line. Thrust generation sections of the motor movable body are disposed symmetrically above and below the motor center axis line, so that the thrust center coincides with the motor center axis line. Since the center of gravity of the motor movable body, the thrust center and the bearing support center coincide with the motor center axis line, a high responsive liner motor can be realized with no decrease in the thrust/movable body mass ratio.
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