Patents by Inventor Yoshifumi Kurokawa

Yoshifumi Kurokawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11390313
    Abstract: A steering jacket includes a first jacket member and a second jacket member in this order from a side proximal to a steering wheel, and the first jacket member and the second jacket member overlap each other such that the steering jacket is extendable and retractable in an axial direction. An actuator is connected to an extension bracket that is attached to an outer surface of the first jacket member and extends toward the front of a vehicle body, so as to extend and retract the first jacket member with respect to the second jacket member.
    Type: Grant
    Filed: April 27, 2021
    Date of Patent: July 19, 2022
    Assignee: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Jessica Elaine Lipa
  • Publication number: 20220212715
    Abstract: A steering device includes a steering wheel, a steering shaft, a steering column, a tilt position adjustment mechanism for tilting the steering column, and a joint for tiltably connecting the steering shaft with a fixed-side rotating body which is supported on a vehicle body side without being interlocked with a tilt operation performed by the tilt position adjustment mechanism. The joint is disposed closer to a steering wheel side than the fixed-side rotating body is.
    Type: Application
    Filed: April 10, 2020
    Publication date: July 7, 2022
    Applicant: NSK LTD.
    Inventor: Yoshifumi KUROKAWA
  • Patent number: 11370473
    Abstract: An interface structure includes a sleeve, a wedge and a biasing member. The sleeve is arranged between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube. The sleeve includes at least one fixing portion fixed to a first tube that is one of the outer tube and the inner tube, at least one contact surface configured to come into contact with a second tube that is the other of the outer tube and the inner tube, and a wedge mating surface configured to be mated with the wedge. The wedge is arranged between the first tube and the sleeve and is mated with the wedge mating surface of the sleeve. The biasing member biases the wedge so as to engage the wedge between the first tube and the sleeve while allowing the sleeve and the second tube to slide on each other.
    Type: Grant
    Filed: December 17, 2020
    Date of Patent: June 28, 2022
    Assignee: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Jessica Elaine Lipa
  • Patent number: 11345387
    Abstract: In an electrically adjustable steering of the present embodiment, a first telescopic actuator is disposed between a top bracket or a mount bracket on a vehicle body side and a steering jacket. The steering jacket includes a plurality of jacket members that overlap each other so as to be able to expand and contract in an axial direction. A motor of the first telescopic actuator is fixed to the top bracket or the mount bracket on the vehicle body side.
    Type: Grant
    Filed: November 19, 2020
    Date of Patent: May 31, 2022
    Assignee: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Jessica Elaine Lipa, Victor Corona Martinez, Juan Antonio Hernandez Otero
  • Patent number: 11338839
    Abstract: 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.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: May 24, 2022
    Assignee: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Simon Read, Steven Marmillo
  • Patent number: 11318980
    Abstract: A steering section of a steer-by-wire system includes a handle having a center axis of rotation arranged in the front-rear direction, and a handle-support shaft having a center axis arranged in the front-rear direction and that is supported so as not to be able to rotate about the center axis with respect to the vehicle. The handle is rotatably supported so as to be able to rotate about the center axis of rotation with respect to the rear-end portion of the handle-support shaft. The center axis of the handle-support shaft is arranged so as to be offset upward with respect to the center axis of rotation of the handle.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: May 3, 2022
    Assignee: NSK, LTD.
    Inventors: Yoshifumi Kurokawa, Yuichiro Taguchi
  • Publication number: 20210394813
    Abstract: An electric steering device includes a top bracket fixed to a vehicle body, a steering shaft to which a steering wheel is connected, a steering jacket which is held by the top bracket and rotatably supports the steering shaft inside, a tilt actuator which adjusts a tilt of the steering jacket, and a link member which is pivotally supported by the top bracket, the steering jacket, and the tilt actuator. The tilt of the steering jacket can be adjusted by transmitting power of the tilt actuator to the steering jacket via the link member. The link member is placed only on one side of the steering jacket in a vehicle left-right direction.
    Type: Application
    Filed: May 26, 2021
    Publication date: December 23, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Victor Corona MARTINEZ
  • Publication number: 20210380158
    Abstract: Provided is a structure of a steering device capable of securing a foot space of the driver's seat widely in the vertical direction. The steering column 3b has a cylindrical front-side column 9a and a cylindrical rear-side column 10a having a front-end portion that is connected to a rear-end portion of the front-side column 9a. The steering shaft 2b has a front-side shaft 11a rotatably supported inside the front-side column 9a, a rear-side shaft 12a rotatably supported inside the rear-side column 10a and has a rear-end portion to which the steering wheel 1 is supported and fastened, and a universal joint 13a that connect the rear-end portion of the front-side shaft 11a and the front-end portion of the rear-side shaft 12a. The front-end portion of the front-side column 9a is always arranged above a portion of the extension line of the center axis of the rear-side column 10a which exists at the same location in the front-rear direction as the front-end portion.
    Type: Application
    Filed: October 16, 2019
    Publication date: December 9, 2021
    Inventor: Yoshifumi Kurokawa
  • Publication number: 20210339790
    Abstract: A steering jacket includes a first jacket member and a second jacket member in this order from a side proximal to a steering wheel, and the first jacket member and the second jacket member overlap each other such that the steering jacket is extendable and retractable in an axial direction. An actuator is connected to an extension bracket that is attached to an outer surface of the first jacket member and extends toward the front of a vehicle body, so as to extend and retract the first jacket member with respect to the second jacket member.
    Type: Application
    Filed: April 27, 2021
    Publication date: November 4, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Jessica Elaine LIPA
  • Publication number: 20210339788
    Abstract: Provided is a structure of a steering section of a steer-by-wire system capable of maintaining large leg space in the driver's seat in the vertical direction. The steering section of a steer-by-wire system includes a handle 1a having a center axis of rotation ? arranged in the front-rear direction, and a handle-support shaft 2a having a center axis ? arranged in the front-rear direction and that is supported so as not to be able to rotate about the center axis ? with respect to the vehicle. The handle 1a is rotatably supported so as to be able to rotate about the center axis of rotation ? with respect to the rear-end portion of the handle-support shaft 2a. The center axis ? of the handle-support shaft 2a is arranged so as to be offset upward with respect to the center axis of rotation ? of the handle 1 a.
    Type: Application
    Filed: October 16, 2019
    Publication date: November 4, 2021
    Inventors: Yoshifumi Kurokawa, Yuichiro Taguchi
  • Patent number: 11136058
    Abstract: A steering apparatus having inner and outer columns. The outer column includes a pair of side plate sections respectively extending in the axial direction, located on both sides in the width direction of the inner column, and has a column-side through hole that passes through in the width direction on one side of the inner column with respect to the height direction in a part in the axial direction thereof, and a column pressing section provided in at least one of the pair of plate sections and able to press the inner column in a direction away from the column-side through holes with respect to the height direction when displaced inward in the width direction, and a widening section in at least one of the pair of plate sections and pressed outward in the width direction via the inner column that is pressed by the column pressing sections.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: October 5, 2021
    Assignee: NSK, Ltd.
    Inventor: Yoshifumi Kurokawa
  • Publication number: 20210229733
    Abstract: In an electrically adjustable steering of the present embodiment, a first telescopic actuator is disposed between a top bracket or a mount bracket on a vehicle body side and a steering jacket. The steering jacket includes a plurality of jacket members that overlap each other so as to be able to expand and contract in an axial direction. A motor of the first telescopic actuator is fixed to the top bracket or the mount bracket on the vehicle body side.
    Type: Application
    Filed: November 19, 2020
    Publication date: July 29, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Jessica Elaine LIPA, Victor Corona MARTINEZ, Juan Antonio HERNANDEZ OTERO
  • Publication number: 20210213998
    Abstract: An interface structure includes a sleeve, a wedge and a biasing member. The sleeve is arranged between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube. The sleeve includes at least one fixing portion fixed to a first tube that is one of the outer tube and the inner tube, at least one contact surface configured to come into contact with a second tube that is the other of the outer tube and the inner tube, and a wedge mating surface configured to be mated with the wedge. The wedge is arranged between the first tube and the sleeve and is mated with the wedge mating surface of the sleeve. The biasing member biases the wedge so as to engage the wedge between the first tube and the sleeve while allowing the sleeve and the second tube to slide on each other.
    Type: Application
    Filed: December 17, 2020
    Publication date: July 15, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Jessica Elaine LIPA
  • Publication number: 20210171086
    Abstract: 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.
    Type: Application
    Filed: October 28, 2020
    Publication date: June 10, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Simon Read, Steven Marmillo
  • Publication number: 20210129902
    Abstract: Provided is a torque transmission joint that makes it possible to transmitting torque continuously between a pair of end section transmission members even when the torque transmission function of an intermediate transmission member is deteriorated. The torque transmission joint includes an intermediate transmission member 19, and a first transmission member 17 and a second transmission member 18 that are arranged with one each on both side sections in the axial direction of the intermediate transmission member 19, with the outer side sections in the radial direction of each engaging with the inside section in the radial direction of the intermediate transmission member 19. The first transmission member 17 and the second transmission member 18 have a first preliminary engagement section 63 and a second preliminary engagement section 66 at the end sections in the axial direction on sides close to each other.
    Type: Application
    Filed: July 23, 2018
    Publication date: May 6, 2021
    Inventors: YOSHIFUMI KUROKAWA, TORU SEGAWA, TORU ISHII
  • Patent number: 10940881
    Abstract: Reinforcing ribs (33a and 33b) are provided between mounting plate parts (30a and 30b) and support plate parts (31a and 31b) forming a support bracket (18a). Side plate parts (40a and 40b) forming a distance bracket (17a) are disposed between the support plate parts (31a and 31b), and an outer column (13a). When an adjustment lever (26a) is operated to hold a steering wheel at a position after adjustment, a steering column (6a) is pushed toward an upper side by column pressing parts (42a and 42b) provided at the side plate parts (40a and 40b), and, therefore, a pair of widened parts (43a and 43b) provided at upper parts of the side plate parts (40a and 40b) are pushed and expanded to the outside in a width direction. The widened parts (43a and 43b) are sandwiched between the support plate parts (31a and 31b) and the outer column (13a).
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: March 9, 2021
    Assignee: NSK LTD.
    Inventors: Yoshifumi Kurokawa, Nobuyuki Nishimura
  • Patent number: 10717459
    Abstract: A portion of the target guide plate interposed between the rolling surface of each ball and an inner surface of the sub-concave groove is supported at the other radial surface opposite to the rolling surface of each ball by the inner surface of the sub-concave groove at a state where one radial surface facing towards the rolling surface of each ball is pressed by the rolling surface of each ball and is thus curved along the rolling surface of each ball.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: July 21, 2020
    Assignee: NSK LTD.
    Inventor: Yoshifumi Kurokawa
  • Publication number: 20200094866
    Abstract: A steering apparatus having inner and outer columns. The outer column is made of an extrusion molded product, and includes a pair of side plate sections respectively extending in the axial direction, located on both sides in the width direction of the inner column, and has a column-side through hole that passes through in the width direction on one side than the inner column with respect to the height direction in a part in the axial direction thereof, and a column pressing section is provided in at least one of the pair of plate sections and able to press the inner column in a direction away from the column-side through holes with respect to the height direction when displaced inward in the width direction, and a widening section in at least one of the pair of plate sections and pressed outward in the width direction via the inner column that is pressed by the column pressing sections.
    Type: Application
    Filed: June 8, 2018
    Publication date: March 26, 2020
    Inventor: Yoshifumi Kurokawa
  • Patent number: 10597065
    Abstract: In a clamped state where the interval between both the pressing parts is reduced and both the clamped plate parts are clamped by both the support plate parts, vertical distances from an outer peripheral surface of the adjustment rod to an upper surface and a lower surface of an inner surface of one through-hole of both the through-holes are different, vertical distances from the outer peripheral surface of the adjustment rod to an upper surface and a lower surface of an inner surface of the other through-hole of both the through-holes are different, and sides, where the vertical distance from the outer peripheral surface of the adjustment rod to the inner surface is smaller, are on opposite sides with respect to the vertical direction in one through-hole and the other through-hole.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: March 24, 2020
    Assignee: NSK LTD.
    Inventor: Yoshifumi Kurokawa
  • Patent number: 10597064
    Abstract: Non-circular portions (41) are provided in two positions of an adjusting rod (17a) in an axial direction, and the non-circular portions (41) are disposed inside of telescopic-adjusting long holes (16a) of a displacement bracket (13a). Up-down-direction clearances (44a and 44b) which are present between opposite edges of each of the non-circular portions (41) in an up-down direction and inner surfaces of each of the telescopic-adjusting long holes (16a) in the up-down direction in a state where a position of a steering wheel can be maintained are less than up-down-direction clearances (43a and 43b) which are present between the opposite edges of each of the non-circular portions (41) in the up-down direction and the inner surfaces of each of the telescopic-adjusting long holes (16a) in the up-down direction in a state where the position of the steering wheel can be adjusted.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: March 24, 2020
    Assignee: NSK LTD.
    Inventor: Yoshifumi Kurokawa