Patents Assigned to NTN Corporation
  • Publication number: 20210018073
    Abstract: A chain tensioner includes a sleeve fixedly disposed in the cylinder, with one end thereof inserted in the plunger and the other end protruding out of the plunger. A cylindrical space is formed between the outer periphery of the sleeve and the inner periphery of the cylinder. An oil supply passage opens to the cylindrical space. A communication passage is defined in the sleeve and provides communication between the cylindrical space and the reservoir chamber.
    Type: Application
    Filed: February 28, 2019
    Publication date: January 21, 2021
    Applicant: NTN Corporation
    Inventor: Kouichi ONIMARU
  • Patent number: 10894473
    Abstract: Provided is an in-wheel motor drive device (21) including: a motor (28); a wheel bearing (53); and a speed reducer (38). The speed reducer (38) comprises: a speed reducer input shaft (Sin) including an input gear (34); a speed reducer output shaft (Sout) including an output gear (37); and an intermediate shaft (Sm) including a small-diameter intermediate gear (36) and a large-diameter intermediate gear (35). The large-diameter intermediate gear (35) has a circumscribed circle which is superimposed with a pitch circle of a plurality of rolling elements (42) of the wheel bearing (53) when viewed from an axial direction.
    Type: Grant
    Filed: November 24, 2016
    Date of Patent: January 19, 2021
    Assignee: NTN CORPORATION
    Inventors: Shinya Taikou, Shiro Tamura, Tomohisa Uozumi
  • Patent number: 10895243
    Abstract: A condition monitoring apparatus which monitors a condition of equipment including a rotor includes a storage and a calculator. The storage stores a plurality of results obtained from a plurality of divided data strings, respectively, resulting from division of a data string obtained by sampling at a regular time interval of signals from sensors provided in the equipment. The calculator estimates a plurality of rotation speeds corresponding to the plurality of divided data strings from the plurality of results accumulated in the storage, respectively, corrects the plurality of divided data strings based on the plurality of rotation speeds, respectively, and generates a corrected data string by combining the plurality of corrected divided data strings. A condition monitoring apparatus capable of accurately analyzing data obtained from the sensors while increase in cost is suppressed and influence by variation in rotation is lessened is thus provided.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: January 19, 2021
    Assignee: NTN CORPORATION
    Inventor: Toru Takahashi
  • Publication number: 20210009193
    Abstract: Provided is a steering system capable of enhancing traveling stability when a vehicle drives straight and improving small-turn performance. The steering system includes: a first steering device; a second steering device including a mechanical section configured to individually steer each of left and right wheels by driving a steering actuator and a control section configured to control the steering actuator; and a vehicle information detection section configured to detect a velocity of the vehicle and a steering angle. The control section includes a turning angle control module configured to control the steering actuator pursuant to a predetermined rule in accordance with the velocity of the vehicle and the steering angle so as to control turning angles of the left and right wheels.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Applicant: NTN CORPORATION
    Inventors: Hirokazu OOBA, Norio ISHIHARA, Satoshi UTSUNOMIYA, Yusuke OHATA
  • Publication number: 20210009199
    Abstract: Provided are a steering function-equipped hub unit that has a simple structure, high rigidity and a reduced size, a steering system, as well as a vehicle including the steering function-equipped hub unit. The steering function-equipped hub unit includes: a hub unit main body including a hub bearing supporting a wheel; a unit support member provided to a knuckle of a suspension device and rotatably supporting the hub unit main body about a turning axis extending in a vertical direction; and a steering actuator configured to rotationally drive the hub unit main body about the turning axis. The hub unit main body is supported by the unit support member through a preloaded rolling bearing.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Applicant: NTN CORPORATION
    Inventors: Hirokazu OOBA, Satoshi UTSUNOMIYA, Norio ISHIHARA, Yusuke OHATA
  • Patent number: 10890236
    Abstract: An operation method for a link actuating device provided with a target value input unit having a height direction target value input portion that allows input of a movement amount in a height direction or a coordinate position in the height direction, which causes the distal end posture of the link actuating device to be changed only in the height direction along a central axis of a proximal end side link hub. An input converter is provided to calculate, by using an inputted value, a target distal end posture of the link actuating device. The input converter further calculates a command operation amount of each actuator from the result of the calculation, and inputs the command operation amount to the control device.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: January 12, 2021
    Assignee: NTN CORPORATION
    Inventors: Seigo Sakata, Yukihiro Nishio, Hiroshi Isobe, Naoya Konagai, Hiroyuki Yamada
  • Patent number: 10890507
    Abstract: A state monitoring method and a state monitoring apparatus which achieve a lower error rate are provided. Rather than collectively processing whole measurement data, the state monitoring apparatus divides the whole measurement data into a plurality of segments and processes each segment. From the measurement data, training data and test data to which an anomaly detection approach is to be applied is randomly selected. By repeatedly calculating an anomaly ratio and averaging the anomaly ratios, a result of discrimination is stabilized.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: January 12, 2021
    Assignee: NTN CORPORATION
    Inventors: Masashi Kitai, Hideyuki Tsutsui
  • Patent number: 10889188
    Abstract: Provided is a drive control device for a vehicle with independently driven wheels, the control device enabling the vehicle to avoid unstable behavior caused by an overrevolution of one of the drive wheels. The vehicle includes left and right motors (6, 6) that independently drive left and right drive wheels (2, 2), respectively. The control device includes: an ECU (21) to generate and output a command torque; an inverter device (22); rotation speed detection modules (34, 34) to detect the rotation speeds of the respective left and right motors (6, 6); and a control module (35) to change the command torques for the respective left and right motors (6, 6) so as to reduce the rotation speeds of the left and right motors (6, 6) when at least one rotation speed between the detected rotation speeds of the left and right motors (6, 6) exceeds a predetermined rotation speed.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: January 12, 2021
    Assignee: NTN CORPORATION
    Inventor: Takeshi Kanda
  • Patent number: 10889178
    Abstract: An in-wheel motor drive device includes: a wheel hub bearing portion having an inner ring integrally rotating with a wheel, an outer ring facing the inner ring via a radial gap, and a hub attachment arranged on a more outer diameter side than the outer ring and mounted and fixed to the outer ring; a motor portion driving the inner ring; a casing housing a rotation transmission path from a motor rotation shaft of the motor portion to the inner ring; a suspending bracket having an upper joining seat portion joinable with an upper side suspension member of a suspension device, a lower joining seat portion joinable with a lower side suspension member of the suspension device, and an intermediate portion connecting the upper joining seat portion and the lower joining seat portion; and fixing means for mounting and fixing the suspending bracket to the hub attachment.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: January 12, 2021
    Assignee: NTN CORPORATION
    Inventors: Shiro Tamura, Shinya Taikou
  • Patent number: 10890213
    Abstract: A value of R/RBASE is not smaller than 0.75 and not greater than 0.87 where R represents a reference radius of curvature of a larger end face of a roller and RBASE represents a distance from an apex of a cone angle of the roller to a larger flange surface of an inner ring 13. A distance from an outermost surface of at least any one of an outer ring, the inner ring, and a plurality of rollers to a bottom of a nitrogen enriched layer is not shorter than 0.2 mm. A crowning profile is formed on a rolling surface of the roller.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: January 12, 2021
    Assignee: NTN CORPORATION
    Inventors: Takashi Kawai, Tomoki Matsushita
  • Publication number: 20210001921
    Abstract: The steering system includes: a first steering device to-steer left and right wheels in a mechanically associated manner by changing an angle of left and right chassis frame components; and a second steering device to drive a supplementary turning actuator to change angles of the wheels relative to the chassis frame components. The second steering device includes a supplementary turning control section to perform a control to cause turning by a steering angle that is a difference between a steering angle determined by a numerical model of vehicle motion on the basis of the steering command angle and the vehicle velocity and an actual steering angle.
    Type: Application
    Filed: September 18, 2020
    Publication date: January 7, 2021
    Applicant: NTN CORPORATION
    Inventors: Norio ISHIHARA, Atsushi ITOU, Masato ABE, Yoshio KANO, Makoto YAMAKADO, Mitsunori ISHIBASHI
  • Patent number: 10883896
    Abstract: A state monitoring system for monitoring state of a gear device having a plurality of gear pairs has a meshing frequency determination device. The meshing frequency determination device includes a maximum-peak-amplitude calculation unit that calculates a maximum peak amplitude from a detected meshing vibration, in estimated frequency ranges and a set harmonic region, and selects such estimated frequencies that a difference in maximum peak amplitude between a plurality of estimated frequency ranges, is less than or equal to a predetermined multiple, and a meshing frequency determination unit that determines an estimated frequency having a total value of maximum peak amplitudes calculated in the plurality of estimated frequency ranges, within a predetermined time, being the k-th (k is a natural number) greatest among the selected estimated frequencies, as a meshing frequency of a gear pair having the k-th highest tooth surface speed.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventors: Kohei Kamiya, Hideyuki Tsutsui
  • Patent number: 10883544
    Abstract: A double-row self-aligning roller bearing has rollers interposed, in two rows aligned in a bearing width direction, between an inner ring and an outer ring. The outer ring has a spherical raceway surface. Each of the rollers has an outer circumferential surface having a cross-sectional shape that matches the raceway surface of the outer ring. Either or both of shapes and contact angles of the rollers are different from each other. An attachment hole to which a protrusion prevention jig is attachable is provided in an end surface of at least either one of the inner ring and the outer ring. The protrusion prevention jig prevents protrusion of the end surface of the inner ring in the bearing width direction with respect to the end surface of the outer ring.
    Type: Grant
    Filed: July 10, 2019
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventors: Kazumasa Seko, Takashi Yamamoto, Yasuyuki Inoue, Michio Hori
  • Patent number: 10882503
    Abstract: An electromechanical brake system includes a linear motion mechanism configured to convert the rotation transmitted from the electric motor to a linear motion, thereby pressing a friction pad against a brake disk; a linear motion mechanism housing in which the linear motion mechanism is received as a single assembly with the components of the linear motion mechanism assembled together; and a caliper body shaped to extend across the outer periphery of the brake disk. The caliper body includes a claw portion axially supporting a friction pad; a housing-fixing plate which is arranged on the side of the linear motion mechanism housing opposite from the brake disk; and an outer shell portion through which the claw portion and the housing-fixing plate are coupled together.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventor: Masaaki Eguchi
  • Patent number: 10883536
    Abstract: A tapered roller bearing includes a cage supporting a plurality of tapered rollers. The cage includes a large-diameter annular portion; a small-diameter annular portion; pillars through which the large-diameter annular portion and the small-diameter annular portion are coupled together; and pockets in which the respective tapered rollers are disposed. A space is defined between the outer ring and the inner ring, and constitutes an oil flow path through which lubricating oil (a) flows from the side of the small flange to the side of the large flange. Each pillar includes, in its radially inner surface, an oil groove in which lubricating oil is retained. When the cage rotates, the lubricating oil retained in the oil grooves of the pillars is scattered out of the oil grooves, thereby preventing seizure between the large-diameter end surfaces of the tapered rollers and the large flange of the inner ring.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventors: Hiroki Matsubuchi, Takashi Kawai
  • Patent number: 10883543
    Abstract: A rolling bearing is provided which includes an inner ring; an outer ring; rolling elements disposed in the bearing space; a cage rollably retaining the rolling elements; and a seal member made of a resin. The seal member includes a support frame, a plurality of window holes, and a filter closing the window holes. Lubricating oil flows through the bearing space to lubricate the interior of the rolling bearing. The cage is made of a magnetic material, and has a pulse ring integrally formed at an end of the cage. The rolling bearing further includes a magnetic rotation sensor mounted to the seal member so as to be capable of being opposed to any of recesses and protrusions of the pulse ring.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventors: Naota Yamamoto, Shota Toho
  • Patent number: 10886808
    Abstract: Provided is an electric linear actuator that enables reduction of the mounting space and reduction of costs. An electric motor of this electric linear actuator is an axial gap motor including a stator and a rotor which are disposed such that orientations of magnetic poles which generate interlinkage flux which contributes to torque generation are parallel to the rotation axis of the electric motor. Further, a linear motion mechanism and the electric motor are disposed in line along the same axis which serves as the axis of a rotation input and output shaft of the linear motion mechanism. First and second coil terminals have extended portions extended in the outer-diameter side in the radial direction with respect to the rotation axis, and the extended portions are electrically connected to a control device through a wiring mechanism.
    Type: Grant
    Filed: January 7, 2019
    Date of Patent: January 5, 2021
    Assignee: NTN CORPORATION
    Inventor: Yui Masuda
  • Patent number: 10875357
    Abstract: A fixed type constant velocity universal joint includes an outer joint member having a cup shape, an inner joint member, which is received in the outer joint member, and transmits torque between the inner and outer joint members through intermediation of balls while allowing angular displacement, and a hollow shaft, which is coupled to the inner joint member so as to allow torque transmission. A threaded hole is formed in a bottom portion of the outer joint member along an axial direction. A recessed hole is formed to be open in a shaft end portion of the hollow shaft opposed to the threaded hole. An embedded stopper that enters the threaded hole is press-fitted into the recessed hole. The embedded stopper is retractable into the hollow shaft in a press-fitting direction.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: December 29, 2020
    Assignee: NTN CORPORATION
    Inventors: Tomoshige Kobayashi, Yuichi Asano
  • Publication number: 20200398292
    Abstract: An air turbine drive spindle capable of suppressing a pressure increase inside a through hole is provided. A spindle includes a rotary shaft and an outer circumferential member (a housing assembly, a cover and a nozzle plate). The rotary shaft is provided with a through hole. The outer circumferential member includes a bearing sleeve configured to surround at least a portion of an outer circumferential surface of the rotary shaft. The outer circumferential member includes a gas supply portion and a gas exhaust hole. The spindle includes a second gas exhaust portion (a first gas exhaust hole and a first gas flow passage). The second gas exhaust portion is independent of the gas exhaust hole and continuous to outside from a gas exhaust space.
    Type: Application
    Filed: August 8, 2017
    Publication date: December 24, 2020
    Applicant: NTN CORPORATION
    Inventor: Teruyoshi HORIUCHI
  • Publication number: 20200400193
    Abstract: A rolling bearing, a rolling device, and a method of manufacturing the rolling device are provided, by which a long life can readily be implemented by suppressing surface damage even on the use condition that the oil film formation performance of a rolling part is poor. A rolling device includes: a first rolling component made of SUJ2; and a second rolling component made of SUJ2 and configured to contact the first rolling component. A surface of a rolling part of the first rolling component is greater in arithmetic mean roughness than a surface of a rolling part of the second rolling component. The arithmetic mean roughness of the surface of the rolling part of the second rolling component is 0.07 ?m or more and 0.20 ?m or less.
    Type: Application
    Filed: January 5, 2017
    Publication date: December 24, 2020
    Applicant: NTN CORPORATION
    Inventor: Naoya HASEGAWA