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公开(公告)号：US12234891B2
公开(公告)日：2025-02-25
申请号：US18006049
申请日：2021-07-15
Applicant: NSK LTD. , KAWASAKI JUKOGYO KABUSHIKI KAISHA
Inventor： Daiki Shirota , Kippei Matsuda , Hideyuki Imai
Abstract: A toroidal continuously variable transmission. A power roller (40) of the transmission includes a power roller inner ring (50) sandwiched between both disks (1, 2), a power roller outer ring (60) provided in a trunnion (35) and rotatably supporting the power roller inner ring (50), and an inner ring hole (52) provided in the power roller inner ring (50) to extend in an axial direction of the power roller inner ring (50), in which an end surface hole (58) communicating with an inner ring hole (52) is provided in an inner end surface (54) of the power roller inner ring (50), and the end surface hole (58) is closed by a closing member (80) separate from the power roller inner ring (50).
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公开(公告)号：US12227232B2
公开(公告)日：2025-02-18
申请号：US17435248
申请日：2020-12-16
Applicant: NSK LTD.
Inventor： Yusuke Nishioka , Yoshihiro Aosaki , Hiroyuki Yamamura
Abstract: A phase adjustment method for a rotation angle sensor configured to detect a rotation angle of a rotor of a brushless motor, the phase adjustment method including: measuring a first rotation speed and a second rotation speed when the brushless motor is driven with a same torque command current to rotate clockwise and counterclockwise, respectively, on a basis of the rotation angle of the rotor detected by the rotation angle sensor; and calculating a correction value to correct a phase of the rotation angle sensor so that a rotation speed difference between the first rotation speed and the second rotation speed decreases.
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公开(公告)号：US20250020167A1
公开(公告)日：2025-01-16
申请号：US18274926
申请日：2022-12-06
Applicant: NSK Ltd.
Inventor： Takatsune ONOZAWA
IPC: F16C33/38
Abstract: A retainer that suppresses retainer sound, includes a main body portion, a plurality of pockets provided in a circumferential direction, and penetrates through the main body portion in a radial direction, and a retaining surface that faces a ball, and forms a C shape when viewed from the radial direction. The retaining surface includes a C-shaped outer circumferential corner portion, a C-shaped inner circumferential corner portion, a first retaining surface arranged in a first rotational direction with respect to the ball, and a second retaining surface arranged in a second rotational direction with respect to the ball. The first retaining surface extends along a first spherical surface obtained by rotating a first virtual circle around a virtual line passing through an axial center and a center of the ball. The second retaining surface extends along a second spherical surface obtained by rotating a second virtual circle around the virtual line.
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公开(公告)号：US12196639B2
公开(公告)日：2025-01-14
申请号：US18245124
申请日：2021-05-31
Applicant: NSK LTD.
Inventor： Taisuke Maruyama , Suguru Sugawara , Masayuki Maeda
Abstract: A detection method for detecting a state of a bearing device including an outer member, an inner member, and a plurality of rolling elements, the detection method including: applying an alternating current voltage to an electric circuit including the outer member, the rolling element, and the inner member while a predetermined load is applied to the bearing device; measuring an impedance and a phase angle of the electric circuit applied with the alternating current voltage; and deriving an oil film thickness and a metal contact ratio between the inner member and the plurality of rolling elements or between the inner member and at least one of the plurality of rolling elements based on the impedance and the phase angle.
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公开(公告)号：US12196292B2
公开(公告)日：2025-01-14
申请号：US18288726
申请日：2022-12-06
Applicant: NSK Ltd.
Inventor： Shuhei Yumiba , Yasumi Watanabe , Yasuaki Abe
IPC: F16H25/22
Abstract: The nut according to the present disclosure includes a nut main body and a circulation component. The nut main body includes a housing part having a bow shape when viewed from an axial direction, a seat surface forming a bottom surface of the housing part, a through hole passing through the seat surface, and a pair of side surfaces arranged on both sides in the axial direction with respect to the housing part.
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Patent Agency Ranking
公开(公告)号：US20250010355A1
公开(公告)日：2025-01-09
申请号：US18712251
申请日：2022-11-16
Applicant: NSK Ltd.
Inventor： Kenji TEZUKA , Nobuyuki HAGIWARA
IPC: B21D53/10
Abstract: A method for manufacturing a bearing ring member includes an inversion step of deforming a workpiece having an annular shape by sandwiching the workpiece between a punch disposed on a first side in a predetermined direction and a die disposed on a second side. The punch has a first R surface formed in a circular arc shape. The die has a second R surface formed in a circular arc shape, and a tapered surface inclined with respect to the predetermined direction. The inversion step includes a first step of deforming the workpiece using the punch and the die in a state where the first R surface and the second R surface are in contact with the workpiece, and a second step of deforming the workpiece using the punch and the die in a state where the first R surface and the tapered surface are in contact with the workpiece.
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公开(公告)号：US12173777B2
公开(公告)日：2024-12-24
申请号：US18026463
申请日：2021-10-20
Applicant: NSK LTD.
Inventor： Reona Umei , Yasumi Watanabe , Yuji Shimomura
Abstract: A linear motion actuator has a ball screw device having a screw shaft, a nut, and a plurality of balls, a piston mounted on one end of the screw shaft, and a stroke limiting mechanism setting an operation starting point in time of the screw shaft toward a first direction pointed by the one end. The nut has one end face directed to the first direction and a protruding part protruding from the one end face.
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公开(公告)号：US12162527B2
公开(公告)日：2024-12-10
申请号：US18037186
申请日：2022-01-17
Applicant: NSK Ltd.
Inventor： Ko Fujioka
Abstract: A drive wheel in which the rotational axial center of a wheel along the vertical direction intersecting the axial center of the axle is arranged shifted in the horizontal direction orthogonal to the axial center of the axle with respect to the axial center of the pivot shaft. When a radius R1 of the wheel, center distance R2 between the rotational axial center and the axial center of the pivot shaft, rotational frequency n1 of the wheel, rotational frequency n2 of the pivot shaft, rotational speed V1 of the wheel, and steering rotational speed V2 of the wheel rolling on a floor surface while turning the pivot shaft satisfy V1=V2, relations of V1=2π×R1×n1, V2=2π×R2×n2, and n1=n2 (R2/R1) are satisfied.
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公开(公告)号：US12152624B2
公开(公告)日：2024-11-26
申请号：US17641245
申请日：2020-09-04
Applicant: NSK Ltd.
Inventor： Takeshi Saito
Abstract: A rolled thread screw includes: a screw part having, on an outer circumferential part of the screw part, thread crests and thread grooves disposed alternately along an axial direction of the rolled thread screw; and a columnar part adjoining at least one of both sides of the screw part in the axial direction. An axial end surface of the columnar part is provided with: a first concave surface concave in the axial direction; a second concave surface positioned to an outer circumference of the first concave surface and being concave in the axial direction; and a salient part positioned on a boundary between the first concave surface and the second concave surface and projecting further than a bottom of the first concave surface and a bottom of the second concave surface, the salient part extending in an arc-like shape along a circumferential direction of the columnar part as viewed in the axial direction.
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公开(公告)号：US12151738B2
公开(公告)日：2024-11-26
申请号：US18043170
申请日：2021-08-31
Applicant: NSK LTD.
Inventor： Yuichiro Taguchi , Shin Yamamoto
Abstract: A steering column device includes a steering column; and a telescopic actuator. The steering column includes a first column member, a second column member assembled to the first column member in a manner of being displaceable relative to the first column member in an axial direction, and a low-friction sliding member disposed between the first column member and the second column member. The telescopic actuator includes a telescopic motor, and displaces the second column member in the axial direction with respect to the first column member by using the telescopic motor as a drive source.
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