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公开(公告)号：US11892060B2
公开(公告)日：2024-02-06
申请号：US17926873
申请日：2021-12-03
申请人： NSK LTD.
发明人： Hiroshi Kawahara , Hiroki Hashiguchi , Hirofumi Itagaki , Azusa Hidaka , Hiroki Nishida , Naofumi Fujita , Hikari Yoshimi , Naohiro Hitomi , Masahiro Kita
CPC分类号： F16H13/08 , F16H13/14 , F16H57/043 , F16H57/0486
摘要： A frictional roller reducer having a sun roller; a ring roller; a plurality of intermediate rollers having rolling surfaces coming in rolling contact with the sun roller and the ring roller; the sun roller or the ring roller having a pair of roller elements including inclined surface portions on a circumferential surface coming in rolling with rolling surfaces, the inclined surface portions inclined in directions going toward the intermediate rollers in a radial direction as going away from each other in the axial direction; a pressing device pressing the pair of roller elements in directions going closer to each other, and an elastic member arranged between the pair of roller elements, the elastic member urging the pair of roller elements in directions going away from the rolling surface of the intermediate rollers.
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公开(公告)号：US20220221031A1
公开(公告)日：2022-07-14
申请号：US17440950
申请日：2020-01-10
申请人： NSK LTD.
发明人： Hiroshi Kawahara , Hirofumi Itagaki
摘要： A structure is achieved capable of ensuring excellent transmission efficiency while preventing the occurrence of gross slipping at traction portions.
A pressing device 9 rotationally drives a cam disk 21 by a pressing force adjusting motor 23, which causes an annular roller element 6a of a pair of annular roller elements 6a, 6b to displace in the axial direction. A controller 31, by adjusting the rotational drive of the pressing force adjusting motor 23, adjusts the surface pressure at the traction portions between rolling surfaces 16 of planetary rollers 7 and an inner-diameter side rolling contact surface 5 of an input shaft 3 and outer-diameter side rolling contact surfaces 12a, 12b of the pair of annular roller elements 6a, 6b to a target value.-
公开(公告)号：US10444253B2
公开(公告)日：2019-10-15
申请号：US15780962
申请日：2016-10-31
申请人： NSK LTD.
发明人： Daisuke Gunji , Hiroshi Kawahara , Fumiaki Soda
摘要： A charger incorporated in a vehicle wheel supporting rolling bearing unit detects an output voltage of an electric generator and calculates a rotation speed of a hub. When a rotation speed of the hub is in a low speed state where a sensor and a wireless communication device are operated by electric power supplied 5 by a battery, a frequency of wireless communication performed between the wireless communication device and a calculator disposed on a vehicle body side is changed according to the rotation speed of the hub or a traveling speed of a vehicle.
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公开(公告)号：US10359102B2
公开(公告)日：2019-07-23
申请号：US15562315
申请日：2016-02-24
申请人： NSK LTD.
摘要： A friction roller-type reduction gear includes a sun roller concentric with an input shaft, a ring roller having a stationary ring roller element and a moveable ring roller element, intermediate rollers in rolling contact with an outer peripheral surface of the sun roller and an inner peripheral surface of the ring roller, a coupling part coupling the ring roller and the output shaft, and a loading cam mechanism having a cam ring for changing contact surface pressure of each rolling contact surface. The outer surface of the sun roller is a concave curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped concave curve, and an outer surface of the intermediate roller is a convex curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped convex curve.
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公开(公告)号：US10161489B2
公开(公告)日：2018-12-25
申请号：US15527894
申请日：2016-04-12
申请人： NSK LTD.
摘要： A pivot holder of a friction-roller-type reduction gear has a pair of bearing parts configured to support a rotational shaft of an intermediate roller and having a pivot axis at an eccentric position from a center of the rotational shaft, and a bridging part configured to integrally couple the pair of bearing parts. A carrier has a holder support part configured to rotatably support the bearing parts. An interaxial distance between a center of the pivot axis and the center of the rotational shaft is equal to or smaller than a maximum radius of an outer diameter of the intermediate roller, and the center of the pivot axis is located on an applying line of a torque reaction force of transmission torque to be applied to the pivot holder.
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公开(公告)号：US10145420B2
公开(公告)日：2018-12-04
申请号：US14891535
申请日：2013-12-19
申请人： NSK LTD.
发明人： Hiroshi Kawahara , Sumio Sugita
摘要： A joint structure includes a shaft member and a cylindrical member. The cylindrical member includes a plurality of first crimped portions crimped along a plurality of axial grooves provided in an axial direction of the shaft member, respectively, and a second crimped portion which fits the axial grooves and is crimped along a circumferential groove, the circumferential groove being provided on a circumferential surface of the shaft member by reducing a diameter of an axially intermediate portion of the cylindrical member in a radial direction. Each of the first crimped portions project from an inner circumferential surface of the cylindrical member as a projection. A position of a tip of the projection in an axis direction of the projection is set displaced from a position of a lowest point of the circumferential groove such that the tip is not located at the lowest point of the circumferential groove.
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公开(公告)号：US11867262B2
公开(公告)日：2024-01-09
申请号：US17440950
申请日：2020-01-10
申请人： NSK LTD.
发明人： Hiroshi Kawahara , Hirofumi Itagaki
摘要： The frictional roller reducer has an input shaft, an output shaft, a pair of annular roller elements, a plurality of planetary rollers, a carrier, a pressing device, and a controller. The pressing device rotationally drives a cam disk by a pressing force adjusting motor, which causes an annular roller element of the pair of annular roller elements to displace in the axial direction. The controller, by adjusting the rotational drive of the pressing force adjusting motor, adjusts the surface pressure at the traction portions between rolling surfaces of the planetary rollers and an inner-diameter side rolling contact surface of the input shaft and outer-diameter side rolling contact surfaces of the pair of annular roller elements to a target value.
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公开(公告)号：US10550978B2
公开(公告)日：2020-02-04
申请号：US14782697
申请日：2013-12-19
申请人： NSK LTD.
发明人： Hiroshi Kawahara , Sumio Sugita
IPC分类号： F16L33/00 , F16L33/207 , F16L13/14
摘要： Provided are: a joining structure capable of suitably obtaining joining strength between components which compose the joining structure; and a joining method thereof. For this purpose, a joining structure (1) includes: a shaft member (10); and a thin-walled cylindrical member (20) that fits an inner circumferential surface thereof to an outer circumferential surface of the shaft member (10). The thin-walled cylindrical member (20) has: a first crimped portion (21), in which an axially intermediate portion is reduced in diameter in a radial direction, and is crimped to the shaft member (10); and a second crimped portion (22), in which an end surface (20a) is folded radially inward, and is crimped to the shaft member (10).
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公开(公告)号：US10386253B2
公开(公告)日：2019-08-20
申请号：US15771313
申请日：2016-10-27
申请人： NSK LTD.
摘要： A vehicle wheel supporting rolling bearing unit includes a stationary side bearing ring member, a rotation side bearing ring member, and plural rolling elements. The rotation side bearing ring member is provided with a first acceleration sensor, a second acceleration sensor, and a third acceleration sensor which are fixed on a virtual plane orthogonal to a center axis of the rotation side bearing ring member. The first acceleration sensor and the second acceleration sensor are arranged on a virtual line passing through a rotation center of the rotation side bearing ring member with a same distance from the rotation center while detection directions thereof are directed in a radial direction and are opposite to each other in the radial direction. The third acceleration sensor is arranged such that a detection direction thereof is non-parallel to the detection directions of the first acceleration sensor and the second acceleration sensor.
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