Patents by Inventor Takemichi YAMASHITA
Takemichi YAMASHITA 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: 11231067Abstract: A bearing member 1 is provided with a coating layer 3 on an inner circumferential surface of a shaft hole 1A into which a shaft body 2 is to be fitted. The coating layer 3 is composed of a metal base material 3A and a heat conductive material 3B that is dispersed in the base material 3A and that has a thermal conductivity relatively higher than that of the base material 3A. The heat conductive material 3B has lengths Lb and Lc in directions B and C along a surface of the coating layer 3, longer than a length La in a thickness direction A of the coating layer 3, whereby thermal conductive characteristics in the directions B and C along the inner circumferential surface of the shaft hole 1A are enhanced. Thus, heat dissipation is improved, whereby temperature rise due to sliding contact with the shaft body 2 is suppressed, and seizure resistance is improved.Type: GrantFiled: May 10, 2018Date of Patent: January 25, 2022Assignee: NISSAN MOTOR CO., LTD.Inventors: Hayato Hirayama, Yutaka Mabuchi, Tsuyoshi Higuchi, Takemichi Yamashita
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Patent number: 11193537Abstract: A bearing member (B1) having a coating layer (1) on an internal circumferential surface of a shaft hole (H) configured to mount a shaft body (P1), the coating layer (1) having a metal layer (2) whose surface is formed unevenly, and a resin layer (3) formed on the metal layer (2), the metal layer (2) having a part thereof exposed (2A) on a surface of the resin layer (3), to inhibit the increase in temperature caused by sliding contact with the shaft body (P1), and accomplishing improvement in seizure resistance.Type: GrantFiled: March 12, 2018Date of Patent: December 7, 2021Assignee: NISSAN MOTOR CO., LTD.Inventors: Hayato Hirayama, Takemichi Yamashita, Tsuyoshi Higuchi, Yutaka Mabuchi
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Patent number: 11186795Abstract: A sliding mechanism excellent in seizure resistance is provided. A sliding mechanism including a lubricating oil interposed at a sliding surface between a DLC coating sliding member (A) and a sliding member (B), wherein the DLC coating sliding member (A) has a DLC film covered on a base material, and metal films in an island configuration are covered on a surface of the DLC film.Type: GrantFiled: December 28, 2017Date of Patent: November 30, 2021Assignee: NISSAN MOTOR CO., LTD.Inventors: Seiichi Nakano, Yutaka Mabuchi, Tsuyoshi Higuchi, Takemichi Yamashita, Hiroshi Tosaka
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Publication number: 20210239156Abstract: A bearing member 1 is provided with a coating layer 3 on an inner circumferential surface of a shaft hole 1A into which a shaft body 2 is to be fitted. The coating layer 3 is composed of a metal base material 3A and a heat conductive material 3B that is dispersed in the base material 3A and that has a thermal conductivity relatively higher than that of the base material 3A. The heat conductive material 3B has lengths Lb and Lc in directions B and C along a surface of the coating layer 3, longer than a length La in a thickness direction A of the coating layer 3, whereby thermal conductive characteristics in the directions B and C along the inner circumferential surface of the shaft hole 1A are enhanced. Thus, heat dissipation is improved, whereby temperature rise due to sliding contact with the shaft body 2 is suppressed, and seizure resistance is improved.Type: ApplicationFiled: May 10, 2018Publication date: August 5, 2021Applicant: NISSAN MOTOR CO., LTD.Inventors: Hayato HIRAYAMA, Yutaka MABUCHI, Tsuyoshi HIGUCHI, Takemichi YAMASHITA
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Publication number: 20210010537Abstract: A bearing member (B1) having a coating layer (1) on an internal circumferential surface of a shaft hole (H) configured to mount a shaft body (P1), the coating layer (1) having a metal layer (2) whose surface is formed unevenly, and a resin layer (3) formed on the metal layer (2), the metal layer (2) having a part thereof exposed (2A) on a surface of the resin layer (3), to inhibit the increase in temperature caused by sliding contact with the shaft body (P1), and accomplishing improvement in seizure resistance.Type: ApplicationFiled: March 12, 2018Publication date: January 14, 2021Applicant: NISSAN MOTOR CO., LTD.Inventors: Hayato HIRAYAMA, Takemichi YAMASHITA, Tsuyoshi HIGUCHI, Yutaka MABUCHI
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Publication number: 20200385645Abstract: A sliding mechanism excellent in seizure resistance is provided. A sliding mechanism including a lubricating oil interposed at a sliding surface between a DLC coating sliding member (A) and a sliding member (B), wherein the DLC coating sliding member (A) has a DLC film covered on a base material, and metal films in an island configuration are covered on a surface of the DLC film.Type: ApplicationFiled: December 28, 2017Publication date: December 10, 2020Applicant: NISSAN MOTOR CO., LTD.Inventors: Seiichi NAKANO, Yutaka MABUCHI, Tsuyoshi HIGUCHI, Takemichi YAMASHITA, Hiroshi TOSAKA
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Patent number: 10578200Abstract: A gear pair includes a first gear and a second gear that are engaged and paired with each other, wherein the arithmetic average roughness Ra of the tooth surface of the first gear is less than 0.10, and the arithmetic average roughness Ra of the tooth surface of the second gear is equal to or greater than 0.15. An improvement of the transmission efficiency is achieved due to the improved composite roughness of the gear pair. Accordingly, both of the improvement of the transmission efficiency of the gears and an improvement of the pitting fatigue life are achieved at low cost.Type: GrantFiled: June 12, 2015Date of Patent: March 3, 2020Assignees: NISSAN MOTOR CO., LTD., AICHI MACHINE INDUSTRY CO., LTD.Inventors: Takemichi Yamashita, Yutaka Mabuchi, Takeshi Kariya, Takao Mori, Tadashi Goto, Hiroyasu Nagami
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Publication number: 20170234417Abstract: A gear pair includes a first gear and a second gear that are engaged and paired with each other, wherein the arithmetic average roughness Ra of the tooth surface of the first gear is less than 0.10, and the arithmetic average roughness Ra of the tooth surface of the second gear is equal to or greater than 0.15. An improvement of the transmission efficiency is achieved due to the improved composite roughness of the gear pair. Accordingly, both of the improvement of the transmission efficiency of the gears and an improvement of the pitting fatigue life are achieved at low cost.Type: ApplicationFiled: June 12, 2015Publication date: August 17, 2017Applicants: NISSAN MOTOR CO., LTD., AICHI MACHINE INDUSTRY CO., LTD.Inventors: Takemichi YAMASHITA, Yutaka MABUCHI, Takeshi KARIYA, Takao MORI, Tadashi GOTO, Hiroyasu NAGAMI