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).
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Patent number: 8104567Abstract: 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: GrantFiled: November 30, 2004Date of Patent: January 31, 2012Assignee: Jtekt CorporationInventors: Tetsuya Murakami, Isamu Shindou, Kazuaki Nagamatsu
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Patent number: 7413052Abstract: 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: GrantFiled: March 15, 2007Date of Patent: August 19, 2008Assignees: Jtekt Corporation, Gates Unitta Asia CompanyInventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
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Patent number: 7360624Abstract: 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: GrantFiled: April 26, 2005Date of Patent: April 22, 2008Assignees: JTEKT Corporation, Gates Unitta Asia CompanyInventor: Kazuaki Nagamatsu
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Publication number: 20070187169Abstract: 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: ApplicationFiled: March 15, 2007Publication date: August 16, 2007Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
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Patent number: 7237647Abstract: 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: GrantFiled: April 26, 2005Date of Patent: July 3, 2007Assignees: Jtekt Corporation, Gates Unitta Asia CompanyInventors: Kensaku Nakamura, Kazuaki Nagamatsu, Hiroshi Murataka, Akihiro Hironaka
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Publication number: 20070102229Abstract: 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: ApplicationFiled: November 30, 2004Publication date: May 10, 2007Inventors: Tetsuya Murakami, Isamu Shindou, Kazuaki Nagamatsu
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Patent number: 7191866Abstract: 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: GrantFiled: April 26, 2005Date of Patent: March 20, 2007Assignees: Koyo Seiko Co., Ltd., Gates Unitta Asia CompanyInventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
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Patent number: 7172051Abstract: 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: GrantFiled: April 15, 2004Date of Patent: February 6, 2007Assignee: Koyo Seiko Co., Ltd.Inventors: Kazuaki Nagamatsu, Kensaku Nakamura, Tetsuya Murakami, Takehiro Saruwatari, Kousuke Yamanaka
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Publication number: 20050197224Abstract: 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: ApplicationFiled: April 26, 2005Publication date: September 8, 2005Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka
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Patent number: 6938722Abstract: 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: GrantFiled: January 28, 2003Date of Patent: September 6, 2005Assignees: 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
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Publication number: 20050192143Abstract: 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: ApplicationFiled: April 26, 2005Publication date: September 1, 2005Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kanihiro Oka
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Publication number: 20050189162Abstract: 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: ApplicationFiled: April 26, 2005Publication date: September 1, 2005Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka
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Publication number: 20040206199Abstract: 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: ApplicationFiled: April 15, 2004Publication date: October 21, 2004Applicant: Koyo Seiko Co., Ltd.Inventors: Kazuaki Nagamatsu, Kensaku Nakamura, Tetsuya Murakami, Takehiro Saruwatari, Kousuke Yamanaka
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Publication number: 20030221896Abstract: 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: ApplicationFiled: January 28, 2003Publication date: December 4, 2003Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka