Patents by Inventor Kazuaki Nagamatsu

Kazuaki Nagamatsu 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: 8104567
    Abstract: In a vehicle steering apparatus in which a housing for supporting coaxially to a rack shaft a ball nut that is provided with a ball screw mechanism constructed between itself and the rack shaft for moving in an axial direction for the purpose of steering and that is rotated by transmission from a steering motor is constructed in a separated form consisting of first and second housings fit to each other by spigot-joint fitting on an outer side of a retaining ring of a thrust bearing for thrust-supporting a rotating cylinder, a gap is provided in a part of the spigot-joint fitting part located on an outer side of the fixing nut screwed into the retaining ring in order to apply from one side a tightening force on a thrust bearing fit into and retained by the retaining ring.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: January 31, 2012
    Assignee: Jtekt Corporation
    Inventors: Tetsuya Murakami, Isamu Shindou, Kazuaki Nagamatsu
  • Patent number: 7413052
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: August 19, 2008
    Assignees: Jtekt Corporation, Gates Unitta Asia Company
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
  • Patent number: 7360624
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: April 22, 2008
    Assignees: JTEKT Corporation, Gates Unitta Asia Company
    Inventor: Kazuaki Nagamatsu
  • Publication number: 20070187169
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.
    Type: Application
    Filed: March 15, 2007
    Publication date: August 16, 2007
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
  • Patent number: 7237647
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: July 3, 2007
    Assignees: Jtekt Corporation, Gates Unitta Asia Company
    Inventors: Kensaku Nakamura, Kazuaki Nagamatsu, Hiroshi Murataka, Akihiro Hironaka
  • Publication number: 20070102229
    Abstract: In a vehicle steering apparatus in which a housing for supporting coaxially to a rack shaft a ball nut that is provided with a ball screw mechanism constructed between itself and the rack shaft for moving in an axial direction for the purpose of steering and that is rotated by transmission from a steering motor is constructed in a separated form consisting of first and second housings fit to each other by spigot-joint fitting on an outer side of a retaining ring of a thrust bearing for thrust-supporting a rotating cylinder, a gap is provided in a part of the spigot-joint fitting part located on an outer side of the fixing nut screwed into the retaining ring in order to apply from one side a tightening force on a thrust bearing fit into and retained by the retaining ring.
    Type: Application
    Filed: November 30, 2004
    Publication date: May 10, 2007
    Inventors: Tetsuya Murakami, Isamu Shindou, Kazuaki Nagamatsu
  • Patent number: 7191866
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other and a belt tension adjuster.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: March 20, 2007
    Assignees: Koyo Seiko Co., Ltd., Gates Unitta Asia Company
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
  • Patent number: 7172051
    Abstract: A nut member which is rotated by power transmission from a motor in a rack housing is supported by a thrust bearing fitted and fixed in a first housing having an integrally formed fixing section for fastening to a vehicle body so that the nut member cannot move in both directions along an axial direction. Thrust loads applied in both directions to the nut member with the conversion of rotation into movement of a steering shaft in an axial direction are carried by the first housing through the thrust bearing. The structure of the connection section of the first housing and second housing is simplified, and the housing is fixed in a stable manner to prevent deterioration in steering feeling.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: February 6, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Kazuaki Nagamatsu, Kensaku Nakamura, Tetsuya Murakami, Takehiro Saruwatari, Kousuke Yamanaka
  • Publication number: 20050197224
    Abstract: An electric power steering apparatus comprises a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism comprises an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and means for adjusting the tension of the belt.
    Type: Application
    Filed: April 26, 2005
    Publication date: September 8, 2005
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka
  • Patent number: 6938722
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: September 6, 2005
    Assignees: Gates Unitta Asia Company, Koyo Seiko Co., Ltd.
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
  • Publication number: 20050192143
    Abstract: An electric power steering apparatus comprises a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism comprises an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and means for adjusting the tension of the belt.
    Type: Application
    Filed: April 26, 2005
    Publication date: September 1, 2005
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kanihiro Oka
  • Publication number: 20050189162
    Abstract: An electric power steering apparatus comprises a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism comprises an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and means for adjusting the tension of the belt.
    Type: Application
    Filed: April 26, 2005
    Publication date: September 1, 2005
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka
  • Publication number: 20040206199
    Abstract: A nut member which is rotated by power transmission from a motor in a rack housing is supported by a thrust bearing fitted and fixed in a first housing having an integrally formed fixing section for fastening to a vehicle body so that the nut member cannot move in both directions along an axial direction. Thrust loads applied in both directions to the nut member with the conversion of rotation into movement of a steering shaft in an axial direction are carried by the first housing through the thrust bearing. The structure of the connection section of the first housing and second housing is simplified, and the housing is fixed in a stable manner to prevent deterioration in steering feeling.
    Type: Application
    Filed: April 15, 2004
    Publication date: October 21, 2004
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Kazuaki Nagamatsu, Kensaku Nakamura, Tetsuya Murakami, Takehiro Saruwatari, Kousuke Yamanaka
  • Publication number: 20030221896
    Abstract: An electric power steering apparatus comprises a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism comprises an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and means for adjusting the tension of the belt.
    Type: Application
    Filed: January 28, 2003
    Publication date: December 4, 2003
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka