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21. 发明公开

US20240060532A1 LINEAR MOTION GUIDE DEVICE 审中-公开
公开(公告)号：US20240060532A1
公开(公告)日：2024-02-22
申请号：US18271257
申请日：2022-01-13
申请人： NSK Ltd.
发明人： Tsutomu OHKUBO
IPC分类号： F16C29/06
CPC分类号： F16C29/06
摘要： A linear motion guide device having a long-life slider is provided. The linear motion guide device includes a guide rail, a plurality of rolling elements, and a slider. The material of the slider body 11 is alloy steel containing 0.1 mass % or more and less than 0.3 mass % of C, 0.5 mass % or more and 1.5 mass % or less of Cr, and 0.1 mass % or more and 0.4 mass % or less of Si, with the balance being Fe and inevitable impurities. An amount of retained austenite in a surface layer 14F of a slider-side rolling groove 14 subjected to a carburizing heat treatment is 15 vol % or more and 45 vol % or less. The surface hardness of the slider-side rolling groove 14 is Hv 650 or more.

22. 发明公开

US20240059344A1 STEERING DEVICE 审中-公开
公开(公告)号：US20240059344A1
公开(公告)日：2024-02-22
申请号：US18265848
申请日：2021-12-09
申请人： NSK Ltd.
发明人： Tomonori MORISHIMA , Tasuku OISHI
IPC分类号： B62D1/19 , B62D1/189
CPC分类号： B62D1/195 , B62D1/189
摘要： A steering device includes an input shaft coupled to a steering wheel and extending in an axial direction, an output shaft fitted to the input shaft and capable of relatively moving in the axial direction with respect to the input shaft, an upper column having a cylindrical shape that is disposed on a radially outer side of the input shaft and rotatably supports the input shaft, a lower column having a cylindrical shape that is fitted to the upper column and capable of relatively moving in the axial direction with respect to the upper column, a column bracket that includes a side plate portion located on the side of the upper column and is detachable from a vehicle body, a support member provided on the upper column, and a pin that is provided to extend along the radial direction and penetrate through the side plate portion and the support member. The support member includes a through-hole through which the pin penetrates, a long hole extending from the through-hole toward the steering wheel, and a stopper positioned between the through-hole and the long hole and supporting the pin.

23. 发明授权

US11892060B2 Frictional roller reducer 有权
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
IPC分类号： F16H13/08 , F16H13/14 , F16H57/04
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.

24. 发明公开

US20240035906A1 LOAD ESTIMATING DEVICE FOR ROLLING BEARING, CONTROL DEVICE FOR MECHANICAL DEVICE PROVIDED WITH ROLLING BEARING, LOAD ESTIMATING METHOD, AND PROGRAM 审中-公开
公开(公告)号：US20240035906A1
公开(公告)日：2024-02-01
申请号：US18282389
申请日：2022-06-08
申请人： NSK Ltd.
发明人： Kinji YUKAWA
IPC分类号： G01L5/00 , F03D7/02 , F03D80/70
CPC分类号： G01L5/0009 , F03D7/0244 , F03D7/0224 , F03D80/70 , F05B2240/50 , F05B2260/90 , F05B2260/70
摘要： This load estimating device for a rolling bearing comprises: a vibration sensor for measuring vibrations of the rolling bearing during rotation; a rotational speed sensor for measuring the rotational speed of the rolling bearing during rotation; a deriving means for deriving a vibration value for a predetermined vibration frequency, using vibration information measured by the vibration sensor; and an estimating means for estimating a load acting on the rolling bearing, said load corresponding to the rotational speed measured by the rotational speed sensor and the vibration value derived by the deriving means, using a table defining a correspondence relationship between the load acting on the rolling bearing, the vibration value for the predetermined vibration frequency, and the rotational speed.

25. 发明公开

US20240035528A1 REVERSE INPUT CUT-OFF CLUTCH 审中-公开
公开(公告)号：US20240035528A1
公开(公告)日：2024-02-01
申请号：US18275724
申请日：2022-11-11
申请人： NSK Ltd.
发明人： Nagao DOHI , Shohei KANEKO
IPC分类号： F16D43/18 , F16D41/08
CPC分类号： F16D43/18 , F16D41/08
摘要： In a predetermined first state, a distance (D1) in a second direction between a contact portion (Pin) between a input-side engaging part (9) and an input-side engaging part (17) and a rotation center (O) is larger than a distance (D2) in the second direction between a contact portion (Pout) between an output-side engaging part (12) and an output-side engaged part (14) and the rotation center (O). In a locked state or a semi-locked state, a contact portion (C1) between the output-side engaging part (12) and the output-side engaged part (14) is located closer to the rotation center (O) of the output member (4) in a first direction than an imaginary straight line (L) connecting a contact portion (C2) between one pressing surface (13) of the pair of pressing surfaces (13) and a pressed surface (6) to the rotation center (O) of the output member (4).

26. 发明公开

US20240018999A1 THRUST ROLLER BEARING 审中-公开
公开(公告)号：US20240018999A1
公开(公告)日：2024-01-18
申请号：US18253209
申请日：2021-10-28
申请人： NSK Ltd.
发明人： Yuki SHIMPO , Atsushi SEKINO
IPC分类号： F16C33/54 , F16C19/30
CPC分类号： F16C33/54 , F16C19/305
摘要： A thrust roller bearing includes a plurality of rollers, a cage, and a race. Each of a first member and a second member of the cage includes an annular web, an inner flange, and an outer flange. The inner flange of the first member and the inner flange of the second member are fixed to each other by crimping. A tab protruding in an axial direction is formed on the outer flange of the second member, and is inserted into one of a plurality of pockets of the first member. The race includes an annular portion forming a raceway surface, an outer race flange forming a first guide surface that guides the cage, and a guide portion forming a second guide surface that guides a shaft member.

27. 发明授权

US11873039B2 Motor control device, electric actuator product, and electric power steering device 有权
公开(公告)号：US11873039B2
公开(公告)日：2024-01-16
申请号：US17281083
申请日：2020-10-02
申请人： NSK LTD.
发明人： Yasutoshi Miki , Masahiro Maeda
IPC分类号： B62D5/04 , H02P27/08 , H02P21/22 , H02P21/05
CPC分类号： B62D5/046 , B62D5/0409 , H02P21/05 , H02P21/22 , H02P27/08
摘要： A motor control device includes a third harmonic calculation unit configured to calculate a first third harmonic on a basis of an average value between a voltage command value of a maximum phase with a maximum duty ratio and a voltage command value of a minimum phase with a minimum duty ratio among three-phase voltage command values; an amplitude calculation unit configured to calculate an amplitude of the three-phase voltage command values; a third harmonic conversion unit configured to convert the first third harmonic into a second third harmonic on a basis of the first third harmonic and the amplitude; a correction unit configured to correct the three-phase voltage command values by subtracting the second third harmonic from the three-phase voltage command values.

28. 发明公开

US20230406387A1 DRIVE WHEEL AND CART 审中-公开
公开(公告)号：US20230406387A1
公开(公告)日：2023-12-21
申请号：US18037186
申请日：2022-01-17
申请人： NSK Ltd.
发明人： Ko FUJIOKA
IPC分类号： B62B5/00 , F16H1/22 , F16H1/24 , B62B3/00
CPC分类号： B62B5/0066 , B62B5/0043 , B62B2301/044 , F16H1/24 , B62B3/001 , F16H1/222
摘要： 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.

29. 发明授权

US11846317B2 Tapered roller bearing 有权
公开(公告)号：US11846317B2
公开(公告)日：2023-12-19
申请号：US17441933
申请日：2020-03-19
申请人： NSK LTD.
发明人： Masaki Chishima , Hiroaki Yamanaka , Hiroyuki Ohshima
IPC分类号： F16C19/36 , F16C33/36 , F16C33/58
CPC分类号： F16C19/364 , F16C33/366 , F16C33/585 , F16C2202/04 , F16C2240/54
摘要： In a tapered roller bearing, the surface roughness of at least a rolling surface and a large diameter-side end surface of a tapered roller is 0.02 to 0.17 μm in protruding mountain portion height Rpk, 0.12 to 0.21 μm in core portion level difference Rk, and 0.07 to 0.43 μm in protruding valley portion height Rvk and the average recessed portion area in the fine irregularities on the surface of the tapered roller is 5 μm2 or less. As a result, oil film formability can be improved under dilute lubrication and a decline in lubricating oil viscosity and surface damage at a rolling contact part and an increase in friction at a sliding contact part can be suppressed at the same time.

30. 发明公开

US20230375081A1 BALL SCREW DEVICE 审中-公开
公开(公告)号：US20230375081A1
公开(公告)日：2023-11-23
申请号：US18030200
申请日：2022-06-16
申请人： NSK LTD.
发明人： Ryo SEGAWA
IPC分类号： F16H25/22
CPC分类号： F16H25/2214
摘要： The ball screw device has a nut having a guide concave groove on the outer-circumferential surface capable of engaging with a rotation restraining member in the circumferential direction, a housing provided with an insertion hole having a retaining concave groove on the inner-circumferential surface capable of engaging with the rotation restraining member in the circumferential direction, the rotation restraining member configured by a shaft-shaped member extending in the axial direction, the rotation restraining member having an outside portion in the radial direction arranged inside the retaining concave groove and an inside portion in the radial direction arranged inside the guide concave groove, so as to be able to slide in the axial direction.

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