Patents Assigned to NSK Ltd.
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Publication number: 20220089216Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.Type: ApplicationFiled: April 7, 2021Publication date: March 24, 2022Applicant: NSK LTD.Inventors: Takayuki KOBAYASHI, Dai SUZUKI, Shin KUMAGAI, Hidetaka NAKAMURA
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Publication number: 20220090659Abstract: A ball screw includes: a screw shaft (10) having a spiral first screw groove (11) formed in an outer peripheral surface thereof; a nut (20) disposed on the periphery of the screw shaft (10) and having a spiral second screw groove (21) formed in an inner peripheral surface thereof; a plurality of balls (30) accommodated in a rolling path (23) formed by the opposing screw grooves (11, 21); and a circulation piece (40) that forms a ball return passage (42) for circulating the plurality of balls (30) through one circuit or less of the rolling path (23). Traffic variation is made to be small by determining the maximum angle of inclination (?) of the ball return passage (42) in an expression using the lead (L), the ball diameter (Da), and the lead angle (?).Type: ApplicationFiled: April 22, 2019Publication date: March 24, 2022Applicant: NSK LTD.Inventor: Keitaro OKA
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Patent number: 11280699Abstract: A flaking development analysis method and a flaking development analysis device for a raceway ring of a rolling bearing which make it possible to, after fine flaking occurs, predict a relationship between an elapsed time and a shape of a flaked portion based on a development speed of the flaking, and perform bearing replacement at an appropriate timing.Type: GrantFiled: February 19, 2020Date of Patent: March 22, 2022Assignee: NSK LTD.Inventors: Kang Zhou, Taketoshi Chifu, Hiroki Mizokuchi
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Publication number: 20220082128Abstract: A photographing step of obtaining an original image by photographing a part or all of a sliding surface using a camera is performed and then an imaging process of detecting machining marks on the original image is performed; a detecting step of obtaining a detection image is performed; and an evaluating step of estimating a difference of a rotation torque of the raceway ring member with respect to another raceway ring member on the basis of the detection image in a direction of relative rotation between the raceway ring member and the other raceway ring member when a rolling bearing is constituted by combining a raceway ring member with the other raceway ring member is performed.Type: ApplicationFiled: December 2, 2019Publication date: March 17, 2022Applicant: NSK Ltd.Inventor: Hidekazu SUZUKI
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Patent number: 11273859Abstract: Please substitute the new Abstract submitted herewith for the original Abstract: Provided is a steering device in which a pair of tension springs is arranged on both outer sides in the width direction of a pair of support plate portions of a support bracket. The pair of tension springs applies a force directed diagonally upward toward the front to a base portion of an adjustment lever and a pressing plate arranged at both end portions of an adjustment rod, and elastically presses the front side surface of an engaging convex portion of a driven-side cam against a front side edge of a long hole in the up-down direction.Type: GrantFiled: March 27, 2019Date of Patent: March 15, 2022Assignee: NSK Ltd.Inventor: Suguru Sugishita
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Patent number: 11273670Abstract: To obtain a structure wherein water having entered the gap between the bottom surface of an annular groove in a rotation-side flange and the inside surface in the axial direction of the brake rotor can be easily drained to the outer space. The outer diameter DO of the annular groove 15 is larger than the diameter DDI of the inscribed circle of the opening portion outside in the axial direction of the water drain holes 17a and is smaller than the diameter DDO of the circumscribed circle of the opening portion outside in the axial direction of the water drain holes 17a.Type: GrantFiled: March 24, 2017Date of Patent: March 15, 2022Assignee: NSK LTD.Inventor: Harumi Takanashi
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Publication number: 20220074010Abstract: A method for manufacturing a magnetostrictive torque sensor shaft (100) to which a sensor portion (2) of a magnetostrictive torque sensor (1) is to be attached includes: a heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process; a shot peening step of performing shot peening using a steel shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion (2) is to be attached; and a surface polishing step of subjecting the shaft member after the shot peening to surface polishing.Type: ApplicationFiled: December 11, 2019Publication date: March 10, 2022Applicant: NSK LTD.Inventors: Kota FUKUDA, Junji ONO, Teruyuki NAKAMURA, Yuta SUGIYAMA
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Publication number: 20220074813Abstract: A method for diagnosing a rolling device (10) including an outer member (1), an inner member (3), and rolling elements (5) includes: applying an AC voltage to an electric circuit including the outer member (1), the rolling elements (5), and the inner member (3); measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied; and measuring a dielectric constant of a lubricant at least one of between the outer member (1) and the rolling elements (5) and between the inner member (3) and the rolling elements (5) based on the measured impedance and the measured phase angle.Type: ApplicationFiled: January 10, 2020Publication date: March 10, 2022Applicant: NSK LTD,Inventors: Taisuke MARUYAMA, Masayuki MAEDA, Ken NAKANO
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Publication number: 20220072657Abstract: A laser welding apparatus (1) includes a laser welding head (5) configured to irradiate a workpiece (10) with laser light, a welding filler feeding mechanism (6) configured to supply a welding material to a position on which laser welding is performed, and a hollow structural moving mechanism (100) configured to move a welding unit (50) including the laser welding head and the welding filler feeding mechanism. The hollow structural moving mechanism has an insertion portion (3a) through which wire materials (41 and 62) of the laser welding head and the welding filler feeding mechanism are inserted.Type: ApplicationFiled: November 12, 2021Publication date: March 10, 2022Applicant: NSK LTD.Inventors: Shingo MATSUO, Hiroaki FUJISHIRO, Etsuo KOIKE, Hironori OKADO
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Publication number: 20220063710Abstract: [Problem] An object of the present invention is to provide a steering apparatus for vehicles that easily obtains equivalent steering torques to a steering angle or the like without being affected by a road surface state and aging-changes of mechanism characteristics of a steering system. [Means for solving the problem] A steering apparatus for vehicles that assists and controls a steering system comprises a torsional angle control section that calculates a motor current command value to make the torsional angle follow a target torsional angle; the torsional angle control section comprises a steering angle disturbance compensating section that calculates a first compensation motor current command value by performing filter processing to the detected steering angle, and the torsional angle control section performs compensation by the first compensation motor current command value in calculation of the motor current command value.Type: ApplicationFiled: December 13, 2019Publication date: March 3, 2022Applicant: NSK LTD.Inventors: Takahiro TSUBAKI, Hiroyasu KUMAGAI
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Patent number: 11260899Abstract: An electric drive device and an electric power steering device are provided that reduce the size of a motor in an axial direction parallel to a shaft and in a radial direction of the shaft. The electric drive device includes a bus bar module in which a connector, a first power supply terminal, a second power supply terminal, positive electrode bus bar wiring that electrically connects the connector to the first power supply terminal, and negative electrode bus bar wiring that electrically connects the connector to the second power supply terminal are integrally formed with the connector. The positive electrode bus bar wiring and the negative electrode bus bar wiring extend from the connector, bypass an extended line of the shaft, and are electrically connected to the circuit board in positions at distances from the connector larger than a distance from the connector to the extended line of the shaft.Type: GrantFiled: December 19, 2019Date of Patent: March 1, 2022Assignee: NSK LTD.Inventor: Masaaki Kawata
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Patent number: 11260902Abstract: A turning control device includes: a steering angular displacement calculation unit configured to, when a third steering angle that is either a first steering angle of a turning mechanism or a second steering angle of a steering mechanism, is in an angular range from a maximum angle to a threshold steering angle, calculate a steering angular displacement of the third steering angle with the threshold steering angle used as a reference; a steering angle correction value calculation unit configured to calculate a steering angle correction value according to at least the steering angular displacement; a steering angle correction value limiting unit configured to limit the steering angle correction value according to at least a steering state, the third steering angle, and angular velocity thereof; a corrected target steering angle calculation unit configured to correct the target steering angle of the turning mechanism with a limited steering angle correction value.Type: GrantFiled: October 21, 2020Date of Patent: March 1, 2022Assignee: NSK LTD.Inventors: Toru Sakaguchi, Tetsuya Kitazume, Shoya Maruyama
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Publication number: 20220060084Abstract: The electric motor with a reverse input cutoff clutch has an output shaft. The output shaft is configured by connecting a first shaft and a second shaft that are coaxially arranged with each other via the reverse input cutoff clutch. The second shaft is rotatably supported to a housing by one radial bearing. The reverse input cutoff clutch has a function that, when rotational torque is inputted to the first shaft, transmits the rotational torque inputted to the first shaft to the second shaft, and when rotational torque is reversely inputted to the second shaft, completely cuts off the rotational torque reversely inputted to the second shaft, and does not transmit the rotational torque to the first shaft, or transmits a part of the rotational torque to the first shaft, and cuts off the remaining part.Type: ApplicationFiled: September 11, 2019Publication date: February 24, 2022Applicant: NSK LTD.Inventors: Hirotaka KISHIDA, Toshirou TOYODA, Yuya DAIKOKU
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Publication number: 20220055089Abstract: An application position of a processing force directed radially outward is continuously changed in the circumferential direction of a cylindrical portion (25) while applying the processing force to a part of the cylindrical portion (25) of a hub main body (21) in the circumferential direction. An application position of a processing force directed radially inward is continuously changed in the circumferential direction of a staking portion intermediary body (41) while applying the processing force to a part of the staking portion intermediary body (41) in the circumferential direction.Type: ApplicationFiled: April 9, 2020Publication date: February 24, 2022Applicant: NSK Ltd.Inventors: Nobuyuki HAGIWARA, Xuexiao ZHAO
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Patent number: 11255378Abstract: A ball arranging method for a ball bearing includes in this order a ball inserting step of inserting a plurality of balls into one region along a circumferential direction of an annular space formed between an inner ring and an outer ring, a flow stopping step of placing a flow stopping jig on a circumferentially outer side of the one region in the annular space so as to hold the inserted balls within the one region, and a ball separating step of sequentially inserting, in an axial direction, tip ends of a plurality of working arrows protruding correspondingly to a number of the balls between the balls while the flow stopping jig is removed from the annular space from a state of being placed in the annular space, so as to arrange the balls at equal intervals in the circumferential direction.Type: GrantFiled: December 11, 2018Date of Patent: February 22, 2022Assignee: NSK LTD.Inventors: Takahiro Suzuki, Kouhei Dobashi
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Patent number: 11253903Abstract: In a preparation step, a frame (10), a concave spherical seat (15), a convex spherical seat (13), a rotation body (16), a rotating shaft (12), and a work holder (17) are assembled, a laser head (33) is attached to the convex spherical seat (13), and a light receiving unit (38) is attached to the work holder (17). In a rotation body centering step, an irradiation position of a laser beam (LB) with respect to a laser irradiation surface (41) is changed by rotating the rotation body (16) while allowing the laser irradiation surface (41) to be irradiated with the laser beam (LB) emitted from the laser head (33) and a trajectory of the irradiation position is checked.Type: GrantFiled: October 24, 2018Date of Patent: February 22, 2022Assignee: NSK LTD.Inventors: Tokumasa Kikuchi, Nobuyuki Hagiwara, Tetsurou Maruno
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Publication number: 20220048554Abstract: A bracket includes a first plate that faces a steering column, a second plate that faces a column cover covering the steering column, and a third plate that connects the first plate and the second plate, and a fourth plate that intersects with the first plate and the third plate.Type: ApplicationFiled: September 18, 2019Publication date: February 17, 2022Applicant: NSK Ltd.Inventors: Suguru SUGISHITA, Hikaru OKABE
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Publication number: 20220041215Abstract: The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.Type: ApplicationFiled: April 7, 2021Publication date: February 10, 2022Applicant: NSK LTD.Inventors: Dai SUZUKI, Takayuki KOBAYASHI, Shin KUMAGAI, Hidetaka NAKAMURA
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Publication number: 20220042582Abstract: A ball screw device includes: a screw shaft the outer peripheral surface of which has a first thread groove; a nut the inner peripheral surface of which is provided with a second thread groove that matches the first thread groove, and the outer peripheral surface of which is provided with a through hole; a plurality of balls that roll between the first thread groove and the second thread groove; a circulation component including a main body part and a pair of leg parts provided on both ends of the main body part, and that is provided on the nut; and a pin component that fixes the circulation component to the nut. Each of the leg parts is inserted into the through hole, the pin component is provided on the leg part in an overlapping manner, and the leg part is retained in the through hole by the pin component.Type: ApplicationFiled: February 12, 2020Publication date: February 10, 2022Applicant: NSK LTD.Inventors: Kanta SATO, Yasuaki ABE, Kazuya YAMADA, Motoshi SAKAI
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Publication number: 20220045590Abstract: A vibration control device includes: a rotor formed of a soft magnetic body and fixed to an output shaft of a rotation driver or to a shaft that rotates in conjunction with the output shaft, the rotor being configured to rotate in response to rotation of the output shaft; a stator provided in a radial circumference of a rotation axis of the rotor; coils fixed to the stator and provided in a pair with the rotation axis therebetween; a charger-discharger provided in such a manner as to be connectable to the coils; a switching circuit provided capable of switching between connecting and disconnecting the coils and the charger-discharger; a first detector configured to detect a rotation angle of the rotor; and a control circuit configured to control operation of the switching circuit in accordance with the rotation angle of the rotor.Type: ApplicationFiled: December 11, 2019Publication date: February 10, 2022Applicant: NSK Ltd.Inventors: Nagao DOHI, Tomoki WAKASAKI