Patents Assigned to NTN Corporation
  • Publication number: 20220145932
    Abstract: A rolling bearing includes an outer ring as a fixed ring, an inner ring as a rotary ring, and rolling elements disposed between the outer ring and the inner ring. The outer ring includes, on the radially opposite side of its raceway surface, a fitting surface fitted to a mating member, two annular grooves in which elastic members are fitted, and a recess adjacent to the annular grooves, and having a bottom surface having an outer diameter smaller than the outer diameter of the fitting surface.
    Type: Application
    Filed: March 9, 2020
    Publication date: May 12, 2022
    Applicant: NTN Corporation
    Inventors: Takanori ISHIKAWA, Takashi KAWAI, Nozomi ISOBE
  • Patent number: 11326871
    Abstract: A height detection apparatus successively changes the brightness of white light from a first level to a second level in accordance with a position of a Z stage and captures an image of interference light while moving a two-beam interference objective lens relative to a paste film in an optical axis direction, detects, as a focus position, a position of the Z stage where the intensity of interference light is highest in a period during which the brightness of white light is set to the first or second level, for each pixel of the captured image, and obtains the height of the paste film based on a detection result.
    Type: Grant
    Filed: August 20, 2020
    Date of Patent: May 10, 2022
    Assignee: NTN CORPORATION
    Inventor: Hiroaki Ohba
  • Patent number: 11325140
    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: Grant
    Filed: August 8, 2017
    Date of Patent: May 10, 2022
    Assignee: NTN CORPORATION
    Inventor: Teruyoshi Horiuchi
  • Patent number: 11326649
    Abstract: A rear-wheel drive shaft (1) includes a fixed type constant velocity universal joint (3), a plunging type constant velocity universal joint (2), and an intermediate shaft (4) coupling both the constant velocity universal joints to each other. A ratio (PCDBALL(f)/DBALL(f)) of a pitch circle diameter (PCDBALL(f)) of balls (33) of the fixed type constant velocity universal joint (3) to a diameter (DBALL(f)) of each of the balls (33) is set from 3.70 to 3.87. A ratio (PCDBALL(s)/DBALL(s)) of a pitch circle diameter (PCDBALL(s)) of balls (23) of the plunging type constant velocity universal joint (2) to a diameter (DBALL(s)) of each of the balls (23) is set from 3.3 to 3.6.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: May 10, 2022
    Assignee: NTN CORPORATION
    Inventors: Masazumi Kobayashi, Tomoshige Kobayashi
  • Patent number: 11326644
    Abstract: A bearing assembly includes a rolling bearing having a bearing ring fitted to a mating member, i.e., a shaft or a housing, with a clearance fit. Of the bearing ring and the mating member, the bearing ring has a flank face that separates a fitting surface of the bearing ring across the entire width thereof. The flank face defines a radial gap between the bearing ring and the housing. In a load receiving region where the radial gap remains, a portion of the bearing ring which is deformed in a wave-shaped pattern is kept out of contact with the fitting surface of the housing. The wave-shaped deformation of the bearing ring does not act as traveling waves that cause creep of the bearing ring.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: May 10, 2022
    Assignee: NTN Corporation
    Inventor: Hayato Kawaguchi
  • Patent number: 11311930
    Abstract: A method is used to forge an outer joint member of a constant velocity universal joint. Track grooves of the outer and inner joint members each have an arc-shaped ball raceway center line having a curvature center that is not offset in an axial direction with respect to a joint center. The forging method includes performing ironing by press-fitting a cylindrical portion of one end of a shaft portion of a pre-processing material of the outer joint member including the shaft portion and the cylindrical portion into a die hole of a die while a punch set that is radially expandable and contractable is fitted to an inner peripheral surface of the cylindrical portion. The punch set includes punches and a punch base to guide the punches to enable advancing and retreating. Each of the punches has a pair of forming surfaces for forming the adjacent track grooves.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: April 26, 2022
    Assignee: NTN CORPORATION
    Inventor: Jia Hua Miao
  • Patent number: 11306776
    Abstract: Provided is a double-row self-aligning roller bearing including: an inner ring; an outer ring having a spherical raceway surface; and rollers arranged in two rows and interposed between the inner ring and the outer ring, wherein a ratio of a contact angle ?1 in one row to a contact angle ?2 in the other row falls within a range of 0.25??1/?2?0.5, and a ratio of distance B1 in a bearing width direction from an end face of the bearing on a side of the one of the rows to an intersection of two lines of action defining the contact angles of the two rows, relative to a distance B2 in the bearing width direction from an end face of the bearing on a side of the other of the rows to the intersection falls within a range of 0.5?B1/B2?0.6.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: April 19, 2022
    Assignee: NTN CORPORATION
    Inventors: Kazumasa Seko, Michio Hori, Yasuyuki Inoue, Takashi Yamamoto, Masaki Nakanishi
  • Patent number: 11306773
    Abstract: A wheel bearing device (1) provided with an outer sealing member (7) in which: a core metal (8) having formed therein multiple seal lips is fitted to the outer opening of an outer ring (2); a metal ring (9) is fitted to the outer peripheral section of a hub ring (3) so as to oppose the core metal. The multiple seal lips are brought into contact with the metal ring, so that a portion between the outer ring and the hub ring is sealed. An annular outer member side weir part (11f) that protrudes to the outer side, in a radial direction, as compared to the outer edge of the metal ring so as to surround the metal ring is provided to the core metal, and an outer member side expanded-diameter part (8g) that holds grease is formed in the inner peripheral surface of the outer member side weir part.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: April 19, 2022
    Assignee: NTN CORPORATION
    Inventors: Ryo Konishi, Tsukasa Watanabe
  • Patent number: 11306778
    Abstract: Provided is a sintered bearing for an EGR valve, including raw material powder including 9% by weight to 12% by weight of aluminum, 0.1% by weight to 0.6% by weight of phosphorus, 3% by weight to 10% by weight of graphite, and the balance including copper as a main component, and inevitable impurities. The sintered bearing has a structure of a sintered aluminum-copper alloy. The sintered bearing further includes free graphite distributed in pores formed so as to be dispersed.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: April 19, 2022
    Assignee: NTN CORPORATION
    Inventors: Yoshinori Ito, Hiroharu Nagata, Tomoyuki Seto, Takahiro Gotou
  • Patent number: 11298814
    Abstract: A link actuation device includes a proximal-end-side link hub, a distal-end-side link hub, three or more link mechanisms each coupling the link hubs such that a posture of the distal-end-side link hub can be changed relative to the proximal-end-side link hub. Each link mechanism includes a proximal-side end link member, a proximal-side intermediate link member, a distal-side intermediate link member, and a distal-side end link member. Actuators for arbitrarily changing the posture and a distance from the distal-end-side link hub to the proximal-end-side link hub are provided to three or more link mechanisms of the three or more link mechanisms. A control unit calculates a rotation angle of the proximal-side end link member according to a targeted posture of the distal-end-side link hub and a targeted distance between the centers of the spherical links, and controls the respective actuators so as to attain the calculated rotation angle.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: April 12, 2022
    Assignee: NTN CORPORATION
    Inventors: Hiroshi Isobe, Naoki Marui, Seigo Sakata, Kenzou Nose
  • Patent number: 11300155
    Abstract: A cage for a tapered roller bearing includes a large-diameter-side annular portion circumferentially extending along large end surfaces of a plurality of tapered rollers; a small-diameter-side annular portion circumferentially extending along small end surfaces of the tapered rollers; and a plurality of pillars coupling together the large-diameter-side annular portion and the small-diameter-side annular portion. The large-diameter-side annular portion has large-diameter-side pocket surfaces opposed to the large end surfaces of the respective tapered rollers. The large-diameter-side pocket surfaces include oil retaining holes including blind holes, and being configured to receive and retain lubricating oil by capillary action.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: April 12, 2022
    Assignee: NTN CORPORATION
    Inventors: Hiroki Matsubuchi, Takashi Kawai, Takanori Ishikawa, Yasuhito Fujikake
  • Patent number: 11300159
    Abstract: An abnormality detection device for a rolling bearing includes a filter that allows passage of lubricating oil, while preventing passage of metal pieces, from the bearing space between the outer ring and the inner ring of the rolling bearing to the exterior of the bearing space. The device further includes an electrical circuit including a pair of permanent magnets mounted, as a pair of electrodes, to the filter so as to be spaced apart from each other, and electrical lines extending from the respective electrodes to a power source. A state detector detects a change in electrical output from the electrical circuit when metal pieces adhere between the pair of permanent magnets, thereby detecting the state of the metal pieces contained in the lubricating oil.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: April 12, 2022
    Assignee: NTN Corporation
    Inventor: Hiroyoshi Ito
  • Patent number: 11298976
    Abstract: In a bearing device for a vehicle wheel (1), a large-diameter section (2i) is formed on an outer side of a fitting cylinder section (2h), and a small-diameter section (2j) is formed on an inner side of the fitting cylinder section (2h). A cap member (8) is formed by bending a metal steel plate, and has a cover plate section (81) which closes the inner open end of an outer member (2) and a fitting section (82) which is fitted over the small-diameter section (2j). A tapered portion (83) based on the spring back angle ? of the fitting section (82) is provided at the outer peripheral edge of the outer end section of the fitting section (82).
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: April 12, 2022
    Assignee: NTN CORPORATION
    Inventors: Ryou Sakurai, Adumi Nobukawa
  • Publication number: 20220105919
    Abstract: A controller of an electric brake device includes first, second and third PKB operators. Upon receipt of an instruction to produce a parking brake active state while a parking brake is released, the first PKB operator exerts a braking force without depending on a brake pedal and determines if a desired braking force is exerted. After the determination by the first PKB operator, the second PKB operator makes a movable part ready to come into engagement with an engaged part and causes an electric motor to rotate in a direction in which the braking force is decreased, so that the movable part comes into engagement with the engaged part to prevent the rotation of the electric motor. Then, the third PKB operator produces the parking brake active state where no driving power is generated to the electric motor.
    Type: Application
    Filed: December 17, 2021
    Publication date: April 7, 2022
    Applicant: NTN CORPORATION
    Inventor: Yui MASUDA
  • Patent number: 11293484
    Abstract: In the tapered roller bearing, at least any one of an outer ring, an inner ring, and a plurality of tapered rollers includes a nitrogen enriched layer. An oil retaining hole is provided in a larger annular portion of a cage. A value of a ratio R/RBASE is not smaller than 0.75 and not greater than 0.87 where R represents a set radius of curvature of a larger end face of the tapered roller and RBASE represents a distance from a point which is an apex of a cone angle of the tapered roller to a larger flange surface of the inner ring. A ratio Rprocess/R is than not lower 0.5 where Rprocess represents an actual radius of curvature after grinding of the larger end face of the tapered roller and R represents a set radius of curvature.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: April 5, 2022
    Assignee: NTN CORPORATION
    Inventors: Takanori Ishikawa, Takashi Kawai, Yasuhito Fujikake, Susumu Miyairi
  • Patent number: 11293494
    Abstract: A bearing equipped with a sensor and incorporating a power generation function in a simple configuration is provided. A bearing includes an outer ring, a plurality of rolling elements, an inner ring, a cage, a seal member, a sensor, a transmission unit, and a power generation unit. The sensor is disposed in the seal member, and detects state information of the bearing. The transmission unit transmits the state information detected by the sensor to outside. The power generation unit is disposed so as to face a bearing space sandwiched between the outer ring and the inner ring, and generates electric power that is to be supplied to the sensor and the transmission unit. The power generation unit includes an element that converts stress into electromotive force.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: April 5, 2022
    Assignee: NTN CORPORATION
    Inventors: Takashi Koike, Yasuyuki Fukushima, Yusuke Shibuya
  • Publication number: 20220099142
    Abstract: A ball bearing is provided which includes a cage made of a resin, and having pockets open to the side surface of the cage on its one axial side. The ball bearing includes an outer bearing ring including a radially protruding engagement portion on the other axial side of the raceway surface. The cage includes engagement portions disposed on the other axial side of the pockets so as to be engageable with the engagement portion of the outer bearing ring in the other axial direction. The relationship between the axial depth H of each pocket and the diameter d of the ball is set at 0.15d?H?0.65d. By setting the above relationship in this way, it is possible to reduce the deformation of the cage due to a centrifugal force, and to reduce the shear resistance of lubricating oil between the pockets and the balls.
    Type: Application
    Filed: January 23, 2020
    Publication date: March 31, 2022
    Applicant: NTN Corporation
    Inventors: Hayato KAWAGUCHI, Nozomi ISOBE
  • Patent number: 11286535
    Abstract: Provided is a heat treatment apparatus (1), including: a conveying device (10), which is configured to convey a rod-shaped workpiece (W) at a predetermined velocity along an axial direction of the workpiece (W); and a heating device (2) including a heating coil (3) configured to inductively heat the workpiece (W) being conveyed to a quenching temperature, wherein the heating coil (3) includes a first heating section (3A) and a second heating section (3B), which are coupled to each other in series along the axial direction of the workpiece (W), and is electrically connected to a single high-frequency power supply (4), and wherein a coil pitch (D2) of the second heating section (3B) arranged relatively on a front side in a conveying direction for the workpiece (W) is larger than a coil pitch (D1) of the first heating section (3A) arranged relatively on a rear side in the conveying direction.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: March 29, 2022
    Assignee: NTN CORPORATION
    Inventors: Tsuneaki Hiraoka, Yuuki Tabuchi, Shintaro Suzuki
  • Patent number: 11279333
    Abstract: The vehicle control device includes a speed calculation unit, a speed estimation unit, a motion feedback calculation unit, and a slip estimator. The speed calculation unit calculates a speed in a predetermined direction of a vehicle on the basis of a feature quantity. The speed estimation unit estimates a speed in the predetermined direction on the basis of a speed or acceleration detected by a motion detector. The motion feedback calculation unit performs feedback calculation in which a value obtained, through a proportional gain, from a deviation between a calculation speed calculated by the speed calculation unit and an estimation speed estimated by the speed estimation unit, is added to the feature quantity. The slip estimator compares the calculation speed with the estimation speed, and estimates that the vehicle is in a slip state in the predetermined direction, when the estimation speed exceeds the calculation speed.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: March 22, 2022
    Assignee: NTN CORPORATION
    Inventor: Yui Masuda
  • Publication number: 20220074449
    Abstract: A bearing assembly is proposed including a rolling bearing of which a bearing ring is fitted to the mating member, i.e., a shaft or a housing, with a clearance fit. Of the bearing ring and the mating member, the bearing ring has a flank face that separates a fitting surface of the bearing ring across the entire width thereof. The flank face defines a radial gap between the bearing ring and the housing. In a load receiving region where the radial gap remains, a portion of the bearing ring which is deformed in a wave-shaped pattern is kept out of contact with the fitting surface of the housing. The wave-shaped deformation of the bearing ring does not act as traveling waves that cause creep of the bearing ring.
    Type: Application
    Filed: September 17, 2019
    Publication date: March 10, 2022
    Applicant: NTN Corporation
    Inventor: Hayato KAWAGUCHI