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81.发明申请公开(公告)号：US20210277940A1
公开(公告)日：2021-09-09
申请号：US17260301
申请日：2019-05-20
申请人： NSK LTD.
发明人： Kouhei DOBASHI
IPC分类号： F16C25/08 , F16C19/54 , F16C35/073
摘要： In the present invention, in a housing that supports a rotating shaft via a rolling bearing which is subjected to predetermined position precompression, a wedge member, the radial thickness of which increases from the leading end towards the base end thereof, is inserted between the housing and the outer circumferential surface of the outer race of the rolling bearing and between the rotating shaft and the inner circumferential surface of an inner race of the rolling bearing, the wedge member being inserted from the leading end thereof along the radial direction of the rotating shaft. The wedge member is fixed by being fastened, ahead in the insertion direction, by bolts and nuts, so that precompression force along with predetermined position precompression is imparted to the rolling bearing.
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公开(公告)号：US20210269083A1
公开(公告)日：2021-09-02
申请号：US17253889
申请日：2019-07-01
申请人： NSK LTD.
发明人： Masafumi Hikida , Yasuyuki Matsuda , Ryuho Morita
摘要： Provided is a reaction force applying device for a steering wheel that can be configured in a small size. The two-stage gears 3a, 3b have an intermediate shaft 9 arranged so as to be parallel to the steering shaft 1, a first teeth section 10 provided on the intermediate shaft 9 and engaging with the shaft side teeth section 4 of the steering shaft 1, and a second teeth section 11 arranged on a portion on the electric motor 2 side of the intermediate shaft 9 with respect to the first teeth section 10 and engaging with the motor side teeth section 8 of the electric motor 2.
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83.发明申请公开(公告)号：US20210268568A1
公开(公告)日：2021-09-02
申请号：US17325675
申请日：2021-05-20
申请人： NSK LTD.
发明人： Nobuyuki HAGIWARA , Tsuyoshi KAMODA
摘要： A hub main body (13z) is supported by a support portion (18). At least one block (22) is engaged with a stationary flange (6) of an outer ring (2). As a support plate (21) rotates, the outer ring (2) rotates. A caulking portion (16) is formed by pressing a pressing die (20) on a cylindrical portion (31).
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公开(公告)号：US20210255060A1
公开(公告)日：2021-08-19
申请号：US17255905
申请日：2019-08-23
申请人： NSK LTD.
IPC分类号： G01M13/045
摘要： An abnormality diagnosis method of a rolling bearing used in rotating machinery includes: a time acquisition step of acquiring, from an output signal detected by a sensor during the rotation of the rolling bearing, an entry time when a rolling element enters a flaking region of a bearing ring, and an escape time when the rolling element escapes from the flaking region of the bearing ring; and an estimation step of estimating a flaking size based on a flaking passage time, which is a time difference between the entry time and the escape time. When the bearing ring receives repeated load from the rolling element, the progress of the flaking occurring in the bearing ring can be quantitatively evaluated.
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公开(公告)号：US20210206426A1
公开(公告)日：2021-07-08
申请号：US16068167
申请日：2018-01-15
申请人： NSK LTD.
IPC分类号： B62D5/04
摘要： [Problem]
An object of the present invention to provide an electric power steering apparatus that has improved reliability in a handle-returning function, by actively and smoothly returning a handle to a neutral point in a running state which is returned to a straight running state by calculating a target steering angle velocity after removing disturbance components included in a steering torque and an assist current, and correcting a current command value by using a handle-returning control current.
[Means for Solving the Problem]
The present invention is the electric power steering apparatus that drives a motor based on the current command value and assist-controls a steering system by a driving-control of the motor, comprising: a handle-returning control section to calculate the target steering angle velocity for handle-returning based on the steering torque, the current command value, a vehicle speed, a steering angle, calculate the handle-returning control current based on a deviation between the steering angle velocity and the target steering angle velocity, and interpose a filter, which attenuates frequency components which are equal to or higher than a steering input or which are equal to or higher than a vehicle motion characteristic, in a calculation path of the target steering angle velocity, wherein the motor is driven by the corrected current command value by using the handle-returning control current.-
公开(公告)号：US20210186654A1
公开(公告)日：2021-06-24
申请号：US16080490
申请日：2017-03-07
申请人： NSK LTD.
摘要： When the compressed air is not applied, an inclined surface, which is positioned at an upstream side with respect to the supply direction of the compressed air, of the lip part is in contact with the inclined surface of the inner ring. When the compressed air is applied, a contact area between the inclined surface, which is positioned at the upstream side with respect to the supply direction of the compressed air, of the lip part and the inclined surface of the inner ring becomes smaller, as compared to when the compressed air is not applied.
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公开(公告)号：US11041544B2
公开(公告)日：2021-06-22
申请号：US16074333
申请日：2017-01-26
申请人： NSK LTD.
发明人： Haruhiko Kiyota , Takeshi Yamamoto , Kaname Yasuda , Tomohiro Arai , Junichi Takano , Kazuki Hotta
摘要： An outer wheel element (16a) formed in an annular shape with a synthetic resin and having a worm wheel tooth part (19a) on an outer circumferential surface thereof embeds a radially outer end part of an inner wheel element (15a) formed in an annular shape with a metal. An outer circumferential surface of the inner wheel element (15a), which is radially superimposed with an engaging part between the worm tooth part (19a) and a the worm wheel tooth part serves as a cylindrical surface part (24). This realizes a structure capable of suppressing manufacturing error of the worm wheel tooth part engaging with the worm tooth part.
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公开(公告)号：US20210171086A1
公开(公告)日：2021-06-10
申请号：US17082501
申请日：2020-10-28
申请人： NSK LTD.
发明人： Yoshifumi Kurokawa , Simon Read , Steven Marmillo
摘要： The position adjustment mechanism is configured to perform a storage operation of storing the steering wheel in a storage position to secure a space in a driver seat for a driver and an adjustment operation of adjusting the steering wheel to a position suitable for driving within an adjustment operation range. The motor control unit is configured to drive the electric motor such that a speed of the steering wheel during the storage operation is higher than a speed of the steering wheel during the adjustment operation.
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公开(公告)号：US11002311B2
公开(公告)日：2021-05-11
申请号：US16623193
申请日：2017-12-15
申请人： NSK LTD.
发明人： Ryuho Morita , Yasuyuki Matsuda , Masafumi Hikida , Eisaku Suzuki , Shunsuke Suzuki , Yoshiya Mukai
摘要： A vehicle weight measurement device includes a diaphragm which covers an opening area of a groove portion of a mounting part to form an oil chamber of a predetermined space together with the groove portion; a pressure sensor which detects a change in pressure of measurement fluid in the oil chamber; a first piston which presses the diaphragm; a second piston which presses the first piston; and a bearing unit interposed between the second piston and a spring bush which receives one end of a spring of a suspension device and is relatively rotatable. The bearing unit includes a thrust needle bearing which swingably supports a load in a longitudinal direction of the suspension device, and a slide bush which does not receive a load in the longitudinal direction and receives a load in a radial direction while causing constant damping to swinging.
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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
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.
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