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91. 发明授权

US11001295B2 Motor control device, motor control method, and electric power steering device 有权
公开(公告)号：US11001295B2
公开(公告)日：2021-05-11
申请号：US16499709
申请日：2018-10-26
申请人： NSK Ltd.
发明人： Hiroaki Takase , Ryo Minaki , Takayoshi Sugawara , Kouichi Nampei
IPC分类号： B62D5/04 , B62D6/00 , H02P27/08
摘要： A motor control device for performing PWM control of an inverter for driving a three-phase brushless motor on the basis of a current command value, wherein the motor control device is provided with: a voltage command value computation unit for calculating a voltage command value using the current command value, and a motor rotation speed and a motor electric angle acquired for each control cycle from the three-phase brushless motor; an electric angle interpolation unit for estimating an interpolated electric angle from the motor electric angle at division intervals obtained by dividing the control cycle; a conversion unit for calculating a three-phase Duty command value from the voltage command value and the motor electric angle, and calculating a three-phase interpolated Duty command value from the voltage command value and the interpolated electric angle; and an output setting unit for switching between, and outputting, the three-phase Duty command value and the three-phase interpolated Duty command value so as to match the division intervals.

92. 发明申请

US20210129902A1 TORQUE TRANSMISSION JOINT AND ELECTRIC POWER STEERING DEVICE 有权
公开(公告)号：US20210129902A1
公开(公告)日：2021-05-06
申请号：US16633261
申请日：2018-07-23
申请人： NSK LTD.
发明人： YOSHIFUMI KUROKAWA , TORU SEGAWA , TORU ISHII
IPC分类号： B62D5/04 , F16D3/74
摘要： Provided is a torque transmission joint that makes it possible to transmitting torque continuously between a pair of end section transmission members even when the torque transmission function of an intermediate transmission member is deteriorated.
The torque transmission joint includes an intermediate transmission member 19, and a first transmission member 17 and a second transmission member 18 that are arranged with one each on both side sections in the axial direction of the intermediate transmission member 19, with the outer side sections in the radial direction of each engaging with the inside section in the radial direction of the intermediate transmission member 19. The first transmission member 17 and the second transmission member 18 have a first preliminary engagement section 63 and a second preliminary engagement section 66 at the end sections in the axial direction on sides close to each other. The first preliminary engagement section 63 and the second preliminary engagement section 66 engage with each other with a circumferential gap interposed therebetween that does not disappear when torque transmission is performed between the first transmission member 17 and the second transmission member 18 via the intermediate transmission member 19.

93. 发明申请

US20210116031A1 SEAL RING, CROSS SHAFT COUPLING, INTERMEDIATE SHAFT ASSEMBLY, STEERING DEVICE 有权
公开(公告)号：US20210116031A1
公开(公告)日：2021-04-22
申请号：US17046406
申请日：2019-04-11
申请人： NSK LTD.
发明人： Seiichi MORIYAMA , Masaki TAKAHASHI
IPC分类号： F16J15/3204 , B62D1/02
摘要： A seal ring (26) configured to be employed with a cross shaft (16) including a center section (17) and four shaft sections (18a, 18b, 18c, 18d) extending in four directions from the center section and formed with step faces (17a) where the center section widens out from base ends of the shaft sections outward in radial directions of the shaft sections, and with bearings (21) for mounting to leading end portions of the shaft sections. The seal ring is fitted over the shaft section and interposed between the bearing and the step face. The seal ring includes a seal lip (34) configured to contact the step face around the entire circumference, and an indentation (36) the seal lip enters by deforming when mounted to the cross shaft.

94. 发明授权

US10948369B2 Torque sensor and steering device 有权
公开(公告)号：US10948369B2
公开(公告)日：2021-03-16
申请号：US16647948
申请日：2018-09-19
申请人： NSK LTD.
发明人： Taishi Shigeta
IPC分类号： G01L3/10 , B62D5/04 , G01L5/22
摘要： A torque sensor includes a sensor housing, a first sleeve attached to a first rotating member that rotates with respect to the sensor housing, a magnet attached to the first sleeve, a second sleeve attached to a second rotating member coupled to the first rotating member via a torsion bar, a carrier attached to the second sleeve, a yoke attached to the carrier and opposing the magnet in a radial direction orthogonal to a shaft direction that is a longitudinal direction of the first rotating member, and a magnetic flux collecting member attached to the sensor housing and opposing the yoke in the shaft direction. The carrier opposes an opposing end surface of either one of the first sleeve and the magnet in the shaft direction. A length of a gap between the carrier and the opposing end surface in the shaft direction is smaller than a length of a gap between the yoke and the magnetic flux collecting member in the shaft direction.

95. 发明授权

US10940881B2 Steering device 有权
公开(公告)号：US10940881B2
公开(公告)日：2021-03-09
申请号：US16318574
申请日：2017-07-18
申请人： NSK LTD.
发明人： Yoshifumi Kurokawa , Nobuyuki Nishimura
IPC分类号： B62D1/184 , B62D1/189
摘要： Reinforcing ribs (33a and 33b) are provided between mounting plate parts (30a and 30b) and support plate parts (31a and 31b) forming a support bracket (18a). Side plate parts (40a and 40b) forming a distance bracket (17a) are disposed between the support plate parts (31a and 31b), and an outer column (13a). When an adjustment lever (26a) is operated to hold a steering wheel at a position after adjustment, a steering column (6a) is pushed toward an upper side by column pressing parts (42a and 42b) provided at the side plate parts (40a and 40b), and, therefore, a pair of widened parts (43a and 43b) provided at upper parts of the side plate parts (40a and 40b) are pushed and expanded to the outside in a width direction. The widened parts (43a and 43b) are sandwiched between the support plate parts (31a and 31b) and the outer column (13a).

96. 发明申请

US20210061344A1 ELECTRIC POWER STEERING APPARATUS 有权
公开(公告)号：US20210061344A1
公开(公告)日：2021-03-04
申请号：US16311757
申请日：2018-04-09
申请人： NSK Ltd.
发明人： Tetsuya KITAZUME
IPC分类号： B62D1/28 , B62D6/00 , B62D15/02
摘要： [Problem]
An object of the present invention is to provide a high-performance electric power steering apparatus that can smoothly switch a steering control mode with a simple structure and does not make a driver uncomfortable when the driver steers a handle in an automatic steering control.
[Means for Solving the Problem]
The present invention is the electric power steering apparatus that has a function, which switches between a manual steering control which drives a motor by the first motor current command value calculated based on at least a steering torque and an automatic steering control which drives the motor by the second motor current command value calculated at a steering angle control section so that an actual steering angle follows-up a target steering angle, comprising: a target steering angle correcting section that performs a calculation process for the steering torque depending on a steering state and vehicle speed and outputs a target steering angle correction value, and a correction outputting section that corrects the target steering angle by using the target steering angle correction value and inputs a corrected correction target steering angle into the steering angle control section.

97. 发明授权

US10914345B2 Grease sealing method and sealing device for ball bearing and ball bearing produced using said sealing method 有权
公开(公告)号：US10914345B2
公开(公告)日：2021-02-09
申请号：US16354703
申请日：2019-03-15
申请人： NSK LTD.
发明人： Norihito Akanuma , Hiroshi Araki
IPC分类号： F16C43/04 , F16C19/06 , B05C5/02 , F16C33/66 , B05D1/00 , B05D1/26 , F16N37/00 , B23P21/00 , B05C1/02 , B23P15/00 , F16N11/00
摘要： A retainer is rotationally driven about a axis of a ball bearing, and convex areas having pockets provided therein along a ball pitch circle of the retainer and concave areas between adjacent pockets is detected by a sensor. Grease is discharged according to phases of the convex areas and concave areas in the rotationally driven retainer from a dispenser having grease discharge ports arranged to face an annular space.

98. 发明授权

US10865832B2 Rolling bearing and production process therefor 有权
公开(公告)号：US10865832B2
公开(公告)日：2020-12-15
申请号：US16734614
申请日：2020-01-06
申请人： NSK LTD.
发明人： Tomohiro Motoda , Hideyuki Uyama
IPC分类号： F16C33/10 , F16C33/20 , F16C35/07 , F16C33/62 , F16C33/58 , F16C21/00 , F16C35/073 , F16C35/077 , F16C33/64 , F16C33/66 , F16C19/06 , F16C33/12 , F16C33/24
CPC分类号： F16C33/62 , F16C21/00 , F16C33/1095 , F16C33/201 , F16C33/205 , F16C33/586 , F16C33/64 , F16C33/6696 , F16C35/07 , F16C35/073 , F16C35/077 , F16C19/06 , F16C33/127 , F16C33/24 , F16C2202/52 , F16C2202/54 , F16C2204/30 , F16C2204/46 , F16C2223/30
摘要： A rolling bearing has an outer diameter surface of the outer ring which is a fitting surface with a housing and the inner diameter surface of the inner ring, which is a fitting surface with a shaft. The outer diameter surface of the outer ring or the inner diameter surface of the inner ring is coated with a bonded film containing an organic binder, a solid lubricant powder such as molybdenum disulfide powder, and a friction/wear modifier such as antimony oxide powder. According to the rolling bearing, a creep resistance is kept excellent without causing increase in cost and size and being deformed and softened.

99. 再颁专利

USRE48336E1 Rolling apparatus 有权
公开(公告)号：USRE48336E1
公开(公告)日：2020-12-01
申请号：US16398979
申请日：2019-04-30
申请人： NSK LTD.
发明人： Koji Ueda , Toru Ueda , Naoya Seno , Nobuaki Mitamura
IPC分类号： C22C38/02 , C21D1/06 , C21D1/10 , C22C38/04 , C22C38/18 , F16C33/64 , F16C33/62 , C21D9/40 , C23C8/26 , C23C8/32 , F16C33/32 , F16C33/34 , F16C19/06 , F16C19/36 , F16C29/06
CPC分类号： C22C38/02 , C21D1/06 , C21D1/10 , C21D9/40 , C22C38/04 , C22C38/18 , C23C8/26 , C23C8/32 , F16C33/32 , F16C33/34 , F16C33/62 , F16C33/64 , C21D2211/001 , C21D2211/008 , F16C19/06 , F16C19/364 , F16C29/0647 , Y02P10/25 , Y10S148/906
摘要： A rolling apparatus including an external member having a raceway surface on an inner peripheral surface thereof, an internal member having a raceway surface on an outer peripheral surface thereof, and a plurality of rolling elements which are rotatably provided between the raceway surface of the external member and the raceway surface of the internal member. A surface of at least one of the internal member, the external member, and the rolling elements is subjected to carbonitriding or nitriding; an area percentage of a nitride containing Si and Mn is 1% or more and 20% or less; surface hardness is HV750 or more. When depth from the raceway surface or depth from a rolling surface of the rolling element is defined as Z and diameter of the rolling element is defined as d, hardness at Z=0.045 d is HV650 to 850, and hardness at Z=0.18 d is HV400 to 800.

100. 发明申请

US20200300299A1 BEARING FOR CLUTCH 审中-公开
公开(公告)号：US20200300299A1
公开(公告)日：2020-09-24
申请号：US16086106
申请日：2018-04-10
申请人： NSK LTD.
发明人： Takanori TANAKA , Seigou URAKAMI , Seiji NAKAMURA
IPC分类号： F16C33/58 , F16C19/16
摘要： An outer ring includes an outer ring small-diameter part extending toward one axial side with respect to the outer ring raceway, a radial wall part extending from an axial end portion of the outer ring small-diameter part toward an inner diameter-side, and a folded-back part extending from a radially inner end portion of the radial wall part toward the other axial side. The folded-back part radially overlaps the inner ring small-diameter part with a radial gap therebetween. The radial gap of an inner diameter-side entry formed by an axial end of the folded-back part and the inner peripheral surface of the inner ring small-diameter part is smaller than the radial gap of an inner diameter-side exit formed by an axial end of the inner ring small-diameter part and an outer peripheral surface of the folded-back part.

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