Patents by Inventor Stefan Lehmkuhl

Stefan Lehmkuhl 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).

  • Steering gear for a steer-by-wire steering device of a motor vehicle
    Patent number: 11878744
    Abstract: A steering gear system (20) for a steer-by-wire steering device of a motor vehicle. The steering gear system having a housing (22), a spindle (24) and a rotatably mounted spindle nut (5), which is located within the housing (22), and a spindle drive (23) for the axial displacement of the spindle (24) relative to the spindle nut (25). The steering gear system further having a spindle nut (25) which, by way of at least one energy store (40), is supported at least indirectly relative to the housing (22) in the rotational direction about a longitudinal axis (a) of the spindle nut (25), so that the spindle nut (25) can be kept in a zero position or in a range around the zero position and/or turned back to the zero position.
    Type: Grant
    Filed: November 4, 2020
    Date of Patent: January 23, 2024
    Assignee: ZF Frie drichshafen AG
    Inventor: Stefan Lehmkuhl
  • STEERING GEAR FOR A STEER-BY-WIRE STEERING DEVICE OF A MOTOR VEHICLE
    Publication number: 20210155281
    Abstract: A steering gear system (20) for a steer-by-wire steering device of a motor vehicle. The steering gear system having a housing (22), a spindle (24) and a rotatably mounted spindle nut (5), which is located within the housing (22), and a spindle drive (23) for the axial displacement of the spindle (24) relative to the spindle nut (25). The steering gear system further having a spindle nut (25) which, by way of at least one energy store (40), is supported at least indirectly relative to the housing (22) in the rotational direction about a longitudinal axis (a) of the spindle nut (25), so that the spindle nut (25) can be kept in a zero position or in a range around the zero position and/or turned back to the zero position.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 27, 2021
    Inventor: Stefan LEHMKUHL
  • Holder for a spring
    Patent number: 9115778
    Abstract: A holder (5) for a spring (2) which has a spring fastening area (10) for fastening the spring (2) to the holder (5) and a wheel carrier fastening area (9) for fastening a wheel carrier (4) to the spring. The holder (5) further has a deformable zone (23) for transmitting force from the spring fastening area (10) to the wheel carrier fastening area (9).
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: August 25, 2015
    Assignee: ZF Friedrichshafen, AG
    Inventors: Volker Wagner, Gabriele Fruhmann, Stefan Lehmkuhl, Arnold Middelkampf, Jorg Brandt, Holger Hoeckmann, Uwe Steinkamp, Norbert Schmudde, Martin Rattay
  • HOLDER FOR A SPRING
    Publication number: 20140167339
    Abstract: A holder (5) for a spring (2) which has a spring fastening area (10) for fastening the spring (2) to the holder (5) and a wheel carrier fastening area (9) for fastening a wheel carrier (4) to the spring. The holder (5) further has a deformable zone (23) for transmitting force from the spring fastening area (10) to the wheel carrier fastening area (9).
    Type: Application
    Filed: July 5, 2012
    Publication date: June 19, 2014
    Applicant: ZF FRIEDRICHSHAFEN AG
    Inventors: Volker Wagner, Gabriele Fruhmann, Stefan Lehmkuhl, Arnold Middelkampf, Jorg Brandt, Holger Hoeckmann, Uwe Steinkamp, Norbert Schmudde, Martin Rattay