Patents Assigned to NSK Ltd.
  • Patent number: 11699052
    Abstract: A bearing component is an annular member with a two-dimensional code which has a shape with a maximum circumferential dimension longer than a maximum radial dimension or a maximum axial dimension. An individual identification method for the bearing component includes the steps of imaging while rotating the bearing component, detecting a line pattern of the two-dimensional code from a captured image, recognizing the two-dimensional code based on an extension direction of the line pattern, extracting corresponding registration information by referring to a database based on information of the two-dimensional code, and identifying the bearing component according to the extracted registration information.
    Type: Grant
    Filed: January 14, 2020
    Date of Patent: July 11, 2023
    Assignee: NSK LTD.
    Inventors: Satoru Suzuki, Asahi Saito
  • Publication number: 20230204443
    Abstract: In a torque sensor, a sleeve is an annular member that is attached to a first rotating member. An intermediate member is an annular member that is placed on an outer circumferential surface of the sleeve. A magnet is an annular member that is placed on an outer circumferential surface of the intermediate member. A yoke is attached to a second rotating member and faces the magnet in a radial direction. A rotating member connecting portion of the sleeve has a cylindrical shape and is contact with the first rotating member. An intermediate member connecting portion is at a position shifted with respect to the rotating member connecting portion in an axial direction. The intermediate member includes a thin portion and a thick portion having a thickness greater than that of the thin portion.
    Type: Application
    Filed: July 16, 2021
    Publication date: June 29, 2023
    Applicant: NSK LTD.
    Inventors: Taishi SHIGETA, Tomofumi SHIGEYAMA
  • Patent number: 11685420
    Abstract: The present teachings relate to a spacer having a body portion and two or more opposing contact surfaces extending from the body portion, forming an angle with the body portion. The spacer may be adapted to engage with a portion of a steering column assembly to reduce or prevent rotation of a column tube during a telescoping adjustment. The teachings also include an adjustable steering column assembly having a column tube with a portion extending therefrom; a steering shaft supported for rotation at least in part by the column tube; a column housing for at least partially supporting the column tube; and the spacer. The spacer may be secured to the column tube to reduce or prevent rotation of the column tube. The teachings further contemplate a method of limiting rotational travel of a column tube during telescoping adjustment using the spacer.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: June 27, 2023
    Assignee: NSK LTD.
    Inventors: Victor Corona Martinez, Logananth Chinniah, David Ray Hartman
  • Publication number: 20230192178
    Abstract: A turning angle detecting device includes: a first storage unit configured to store a turning angle neutral point correction value being a difference between a median of the turning angles at respective limits in right and left steering and the turning angle in a straight traveling state; a second storage unit configured to store an initial position of a movable portion of an actuator of a wheel turning mechanism in the straight traveling state; a first turning angle calculating unit configured to calculate a first turning angle with respect to the median of the turning angles at the respective limits based on a detection value of a position of the movable portion; and a second turning angle calculating unit configured to calculate a second turning angle based on the detection value, the turning angle neutral point correction value, the initial position and the first turning angle.
    Type: Application
    Filed: February 4, 2022
    Publication date: June 22, 2023
    Applicant: NSK LTD
    Inventors: Shoya MARUYAMA, Tetsuya KITAZUME
  • Publication number: 20230193984
    Abstract: A frictional roller reducer having a sun roller; a ring roller; a plurality of intermediate rollers having rolling surfaces coming in rolling contact with the sun roller and the ring roller; the sun roller or the ring roller having a pair of roller elements including inclined surface portions on a circumferential surface coming in rolling with rolling surfaces, the inclined surface portions inclined in directions going toward the intermediate rollers in a radial direction as going away from each other in the axial direction; a pressing device pressing the pair of roller elements in directions going closer to each other, and an elastic member arranged between the pair of roller elements, the elastic member urging the pair of roller elements in directions going away from the rolling surface of the intermediate rollers.
    Type: Application
    Filed: December 3, 2021
    Publication date: June 22, 2023
    Applicant: NSK LTD.
    Inventors: Hiroshi KAWAHARA, Hiroki HASHIGUCHI, Hirofumi ITAGAKI, Azusa HIDAKA, Hiroki NISHIDA, Naofumi FUJITA, Hikari YOSHIMI, Naohiro HITOMI, Masahiro KITA
  • Patent number: 11680628
    Abstract: In the ball screw device, the circulation path that returns balls from the end point to the start point of the load path includes a return path, scooping paths, and connecting paths. The scooping path has an arc-shaped center line that is curved outward in the radial direction as going toward the reference imaginary flat plane including the center axis of the screw shaft and the center line of the return path in the circumferential direction. The connecting path is arranged on the reference imaginary flat plane and includes a straight path having a linear center line extending in a direction orthogonal to the center axis of the screw shaft. When the radius of curvature of the center line of the scooping path is R1, the scooping angle is ?, and the entire length of the straight path is S, R1 cos(90°??)+S is made larger than the diameter of the balls.
    Type: Grant
    Filed: March 10, 2021
    Date of Patent: June 20, 2023
    Assignee: NSK LTD.
    Inventors: Kazuya Yamada, Yuji Shimomura, Kanta Sato, Yasuaki Abe
  • Publication number: 20230175577
    Abstract: A ball screw device includes a nut (3), a screw shaft, and a plurality of balls arranged between the nut (3) and the screw shaft. The nut (3) includes a first member (11) disposed to surround the screw shaft, a second member (10) disposed between the screw shaft and the first member (11), and a third member (12) disposed between the first member (11) and the second member (10). The third member (12) includes a laminate body (12A) having a plurality of plates (22a, 22b) laminated in an axial direction. The laminate body (12A) includes an inner surface facing an outer surface of the second member (10). The inner surface of the laminate body (12A) has a shape corresponding to a shape of the outer surface of the second member (10).
    Type: Application
    Filed: August 13, 2021
    Publication date: June 8, 2023
    Applicant: NSK Ltd.
    Inventor: Masahito YAMAMOTO
  • Publication number: 20230179063
    Abstract: An output shaft is configured by connecting a first shaft and a second shaft, coaxially arranged with each other, by a reverse input cutoff clutch 20; an end portion on one side in an axial direction of the second shaft located on an opposite side from the first shaft with a gear portion sandwiched in between in the axial direction being rotatably supported with respect to a fixed portion by a bearing device; the reverse input cutoff clutch having a function that, when rotational torque is input to the first shaft, transmits the rotational torque input to the first shaft to the second shaft, and when rotational torque is reversely input to the second shaft, completely cuts off the rotational torque reversely input to the second shaft and does not transmit the rotational torque to the first shaft, or transmits part of the rotational torque to the first shaft and cuts off the remaining portion.
    Type: Application
    Filed: January 25, 2022
    Publication date: June 8, 2023
    Applicant: NSK LTD.
    Inventors: Nagao DOHI, Yuya DAIKOKU, Eiji INOUE
  • Publication number: 20230175553
    Abstract: In a raceway surface of at least one of an inner ring and an outer ring, a region not affected by machining is set as a first region, and a region, which has (a) a machining amount of 0.03 or more, (b) an amount of residual austenite being 70% or more of an amount of retained austenite in the first region, and (c) a compressive residual stress being higher by 500 MPa or more than a compressive residual stress in the first region, is set as a second region.
    Type: Application
    Filed: January 27, 2021
    Publication date: June 8, 2023
    Applicant: NSK LTD.
    Inventors: Hirofumi ITO, Masahide NATORI, Hideyuki HIDAKA
  • Publication number: 20230179070
    Abstract: To provide an electric driving device and an electric power steering device that have a smaller size in the axial direction and suppress stress on a circuit board due to electrical connection between a motor and the circuit board if a terminal block is provided. An electric driving device includes a motor and an electronic control unit that controls rotation of the motor. The electronic control unit includes a first circuit board, a first heat sink, a second heat sink, and a terminal block. The second heat sink sandwiches the first circuit board between it and the first heat sink. The terminal block is fixed to the side surface of the second heat sink and electrically connects motor coil wiring to the first circuit board.
    Type: Application
    Filed: February 10, 2022
    Publication date: June 8, 2023
    Applicant: NSK LTD.
    Inventor: Masakazu MORIMOTO
  • Patent number: 11662003
    Abstract: A ball screw device has a screw shaft; a nut; a circulation part; and balls; a housing concave groove provided on the outer circumferential surface of the nut and linearly extending in the axial direction and opening to end surfaces on both outer sides in the axial direction of the nut, a circulation part arranged inside the housing concave groove, and the circulation part being prevented from displacing toward the outer side in the radial direction and displacing in the circumferential direction with respect to the nut by engaging an engaging convex portion of a fixing portion provided in the end portion on each of both outer sides in the axial direction of the circulation part with an engaging recess portion provided in the end portion of each of both outer sides in the axial direction of the housing concave groove.
    Type: Grant
    Filed: March 12, 2021
    Date of Patent: May 30, 2023
    Assignee: NSK LTD.
    Inventors: Kazuya Yamada, Yuji Shimomura, Yasuaki Abe, Kanta Sato
  • Publication number: 20230160431
    Abstract: A first piece (13) includes a first ring portion (13b) and a second ring portion (13c) which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion (13b) are respectively larger than an inner diameter and an outer diameter of the second ring portion (13c). A second piece (16) is obtained by pressing the first piece (13) while the first piece (13) is disposed between a first set and a second set.
    Type: Application
    Filed: July 6, 2021
    Publication date: May 25, 2023
    Applicant: NSK Ltd.
    Inventors: Kouhei MORI, Mizuki WATANABE, Isao SHINTOU, Hiroshi KOYAMA
  • Patent number: 11655862
    Abstract: The rotation transmission state switching device comprises a clutch device comprising a first rotating member having a first-rotating-member-side engaging portion, a second rotating member having a second-rotating-member-side engaging portion, a third rotating member having a third-rotating-member-side engaging portion; and an engaging element having an engaging-element-side first engaging portion engaging with the first-rotating-member-side engaging portion, an engaging-element-side second engaging portion engaging with the second-rotating-member-side engaging portion, and an engaging-element-side third engaging portion engaging with the third-rotating-member-side engaging portion; and a restriction device configured to switch between allowing and restricting rotation of the first rotating member, allowing or preventing torque transmission between the second rotating member and the third rotating member.
    Type: Grant
    Filed: June 15, 2021
    Date of Patent: May 23, 2023
    Assignee: NSK LTD.
    Inventors: Nagao Dohi, Eiji Inoue
  • Patent number: 11655886
    Abstract: A ball screw device having a screw shaft rotating during use, a nut moving linearly during use, balls, a fitting cylinder fixed to the nut, a housing, and an anti-rotation member, a first member, which is one of the nut and the fitting cylinder, having a retaining concave portion engaging with a radially inner portion of the anti-rotation member and including a closed surface, an insertion hole of the housing having a guide concave groove engaging with a radially outer portion of the anti-rotation member, the radially inner portion held between the closed surface and an axially end surface a second member, which is the other of the nut and the fitting cylinder, the radially outer portion being able to slide in the guide concave groove.
    Type: Grant
    Filed: April 14, 2022
    Date of Patent: May 23, 2023
    Assignee: NSK LTD.
    Inventor: Ryo Segawa
  • Patent number: 11648978
    Abstract: A torque transmission joint to suppress occurrence of noise when reversing the direction of rotation of a drive shaft. A first transmission member fixed to an output shaft (the drive shaft) is engaged with a first elastic member such that a first gap in a circumferential direction is interposed, as well as with an intermediate transmission member such that a larger gap in the circumferential direction is interposed. A second transmission member fixed to an end portion of a worm is engaged with a second elastic member such that a second gap in the circumferential direction is interposed, as well as with the intermediate transmission member such that a larger gap in the circumferential direction is interposed. First and second annular convex portions are fitted to, respectively, first and second concave portions to prevent separation of the first and second elastic members with respect to the intermediate transmission member.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: May 16, 2023
    Assignee: NSK, LTD.
    Inventors: Toru Segawa, Ryou Oosawa, Toru Ishii, Ryota Sugihara, Takeshi Yamamoto, Akihide Fujita
  • Publication number: 20230143956
    Abstract: A steering device includes a telescopic steering shaft that extends in a first direction, and a cylindrical outer steering column that rotatably supports the steering shaft. The steering column includes a lower column and an upper column having one end slidably attached to the lower column and the other end on which a bearing that supports the steering shaft is provided. The upper column includes a clamp that is externally slidably fitted to the lower column and that has a slit extending in the first direction, and a cylindrical part that has a cylindrical shape and that has one end continuous with the clamp and the other end blocked by the bearing being internally fitted. The cylindrical part has an air hole that is spaced apart from the one end of the cylindrical part and that penetrates an outer peripheral surface and an inner peripheral surface of the cylindrical part.
    Type: Application
    Filed: March 25, 2021
    Publication date: May 11, 2023
    Applicant: NSK LTD.
    Inventors: Tomohiro IKUTA, Yoshiyuki SATO, Suguru SUGISHITA, Hirotaka SHIMIZU
  • Publication number: 20230143959
    Abstract: The steering device includes a steering shaft, a steering column, a bracket, and a fastening mechanism. The steering column includes a lower column and an upper column. The upper column includes a clamp, a cylindrical part, a pair of protrusions, and a reinforcement rib that extends across an outer peripheral surface of the clamp and an outer surface of one of the protrusions. The clamp includes a continuous clamp positioned near the cylindrical part and a spaced clamp spaced apart from the cylindrical part. The protrusions include a continuous protrusion that protrudes from the continuous clamp, and a spaced protrusion that protrudes from the spaced clamp. The reinforcement rib linearly extends from the spaced protrusion toward the continuous clamp.
    Type: Application
    Filed: March 25, 2021
    Publication date: May 11, 2023
    Applicant: NSK LTD.
    Inventors: Tomohiro IKUTA, Yoshiyuki SATO, Suguru SUGISHITA, Hirotaka SHIMIZU
  • Patent number: 11643615
    Abstract: A lubricant composition according to the present invention contains a fatty acid metal salt, a metal dithiocarbamate, and an additive having an effect of increasing an acid value of the lubricant composition, whereby fretting resistance performances are further improved.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: May 9, 2023
    Assignee: NSK LTD.
    Inventors: Taisuke Maruyama, Yujiro Toda, Eri Watabe, Suguru Sugawara, Masayuki Maeda
  • Publication number: 20230132450
    Abstract: A steering device includes a steering shaft, a steering column, a bracket, and a fastening mechanism. An upper column includes a clamp, a cylindrical part, a pair of protrusions, and contact ribs. The clamp includes a continuous clamp and a spaced clamp. The protrusions include a continuous protrusion and a spaced protrusion. The contact ribs include first contact ribs disposed each of which is disposed on the outer peripheral surface of the clamp, second contact ribs each of which is disposed on a side surface of the protrusion and disposed opposite to the first contact rib with respect to a long groove, and at least one third contact rib disposed on a side surface of the spaced protrusion and between the first contact rib and the long groove. The third contact rib has a protrusion amount greater than those of the first contact rib and the second contact rib.
    Type: Application
    Filed: March 25, 2021
    Publication date: May 4, 2023
    Applicant: NSK LTD.
    Inventors: Tomohiro IKUTA, Yoshiyuki SATO, Suguru SUGISHITA, Hirotaka SHIMIZU
  • Publication number: 20230133413
    Abstract: A ball screw device having a screw shaft rotating during use, a nut moving linearly during use, balls, a fitting cylinder fixed to the nut, a housing, and an anti-rotation member, a first member, which is one of the nut and the fitting cylinder, having a retaining concave portion engaging with a radially inner portion of the anti-rotation member and including a closed surface, an insertion hole of the housing having a guide concave groove engaging with a radially outer portion of the anti-rotation member, the radially inner portion held between the closed surface and an axially end surface a second member, which is the other of the nut and the fitting cylinder, the radially outer portion being able to slide in the guide concave groove.
    Type: Application
    Filed: April 14, 2022
    Publication date: May 4, 2023
    Applicant: NSK LTD
    Inventor: Ryo SEGAWA