Patents by Inventor Atsushi Kamahora
Atsushi Kamahora 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: 9546627Abstract: In a support structure of a direct fuel injection valve capable of supporting a fuel injection valve stably for a long period of time, a valve housing is made of a metal and is provided with a first load bearing portion which is to be supported by an engine in an axial direction of the valve housing, a rear end portion of the fixed core is provided with a second load bearing portion which is to be supported by a resilient holding member in the axial direction, and the first and second load bearing portions are held between the engine and the resilient holding members with a forward set load applied to the resilient holding member by a fuel distribution pipe fitted to a fuel inlet tube and fixed to the engine.Type: GrantFiled: October 18, 2013Date of Patent: January 17, 2017Assignee: Keihin CorporationInventors: Atsushi Okamoto, Atsushi Kamahora, Junichi Miyashita, Noriaki Sumisya
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Patent number: 9506438Abstract: In a fuel injection valve support structure, a pair of contact surfaces are formed on an intermediate portion of the valve so as to be opposite to each other with a plane therebetween, the plane including a center axis of the valve and a center line of a coupler, the elastic support member includes a base plate placed on a second load receiving portion, an elastic piece extending from the base plate, coming into pressure contact with a fuel supply cap elastically, and biasing the valve against an engine by a reaction force resulting from the contact, and a pair of rotation locking pieces extending from the base plate and coming into contact with the respective contact surfaces to restrict rotation of the valve about the axis, and at least one of the contact surfaces has a positioning groove for elastically engaging corresponding one of the rotation locking pieces.Type: GrantFiled: November 1, 2013Date of Patent: November 29, 2016Assignee: Keihin CorporationInventors: Yutaka Inomata, Atsushi Kamahora, Yuzuru Sasaki, Takahiro Yasuda
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Patent number: 9212641Abstract: In a fuel injection valve supporting structure, a contact surface being orthogonal to a center axis of a fuel injection valve and opposed to a fuel supply cap is formed in an intermediate portion of the fuel injection valve, a supporting member includes a base plate set on the contact surface and an elastic piece extending from the base plate, the elastic piece includes: a first elastic portion extending from the one end of the base plate and bent upwards in a U-shape; and a second elastic portion extending from the first elastic portion toward the other end while bending upwards, bringing its apex into pressure contact with the fuel supply cap, and making a tip end portion thereof slidably come into contact with the base plate, and a curvature radius of the second elastic portion is set larger than a curvature radius of the first elastic portion.Type: GrantFiled: February 14, 2013Date of Patent: December 15, 2015Assignee: Keihin CorporationInventors: Nakaya Nakamura, Atsushi Kamahora, Go Namekawa, Hideaki Kino
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Publication number: 20140123933Abstract: In a support structure of a direct fuel injection valve capable of supporting a fuel injection valve stably for a long period of time, a valve housing is made of a metal and is provided with a first load bearing portion which is to be supported by an engine in an axial direction of the valve housing, a rear end portion of the fixed core is provided with a second load bearing portion which is to be supported by a resilient holding member in the axial direction, and the first and second load bearing portions are held between the engine and the resilient holding members with a forward set load applied to the resilient holding member by a fuel distribution pipe fitted to a fuel inlet tube and fixed to the engine.Type: ApplicationFiled: October 18, 2013Publication date: May 8, 2014Applicant: KEIHIN CORPORATIONInventors: Atsushi OKAMOTO, Atsushi KAMAHORA, Junichi MIYASHITA, Noriaki SUMISYA
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Publication number: 20140123926Abstract: In a fuel injection valve support structure, a pair of contact surfaces are formed on an intermediate portion of the valve so as to be opposite to each other with a plane therebetween, the plane including a center axis of the valve and a center line of a coupler, the elastic support member includes a base plate placed on a second load receiving portion, an elastic piece extending from the base plate, coming into pressure contact with a fuel supply cap elastically, and biasing the valve against an engine by a reaction force resulting from the contact, and a pair of rotation locking pieces extending from the base plate and coming into contact with the respective contact surfaces to restrict rotation of the valve about the axis, and at least one of the contact surfaces has a positioning groove for elastically engaging corresponding one of the rotation locking pieces.Type: ApplicationFiled: November 1, 2013Publication date: May 8, 2014Applicant: KEIHIN CORPORATIONInventors: Yutaka INOMATA, Atsushi KAMAHORA, Yuzuru SASAKI, Takahiro YASUDA
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Patent number: 7637442Abstract: A fuel injection valve is provided that includes a valve seat member (3) having a conical valve seat (8) and a valve hole (7) formed through a central part of the valve seat (8), a valve body (18) working in cooperation with the valve seat (8), and an injector plate (10) joined to the valve seat member (3) and having a plurality of fuel injection holes (11) radially outwardly displaced from the valve hole (7), a diffusion chamber (39) providing communication between the valve hole (7) and the fuel injection holes (11) being provided between the valve seat member (3) and the injector plate (10), wherein the diffusion chamber (39) formed between the valve seat member (3) and the injector plate (10) is in an annular shape, has a diameter that is larger than that of the valve hole (7), and has inner ends of the fuel injection holes (11) opening therein, and a plurality of fuel passages (42a, 42b) are disposed within the valve hole (7), the plurality of fuel passages (42a, 42b) reversing within the valve hole (7)Type: GrantFiled: March 7, 2006Date of Patent: December 29, 2009Assignee: Keihin CorporationInventors: Ryuji Aoki, Daisuke Sato, Atsushi Kamahora, Akira Arioka
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Patent number: 7530508Abstract: In a fuel injection valve, a fuel guide member facing the valve hole is connected to an injector plate, and an annular diffusion chamber is formed between a valve seat member and the injector plate. A pair of first notches, a pair of second notches, and a plurality of closing parts are formed in an outer periphery of the fuel guide member. The first notches are arranged on a first diameter line of the valve hole. The second notches are arranged on a second diameter line perpendicular to the first diameter line. The closing parts are provided between the first and second notches to partially close the valve hole. A plurality of fuel injection holes are dispersally arranged in outside regions corresponding to the closing parts and inside regions corresponding to the first notches.Type: GrantFiled: May 8, 2007Date of Patent: May 12, 2009Assignee: Keihin CorporationInventors: Daisuke Sato, Atsushi Kamahora, Akira Arioka, Ryuji Aoki
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Publication number: 20080203194Abstract: A fuel injection valve is provided that includes a valve seat member (3) having a conical valve seat (8) and a valve hole (7) formed through a central part of the valve seat (8), a valve body (18) working in cooperation with the valve seat (8), and an injector plate (10) joined to the valve seat member (3) and having a plurality of fuel injection holes (11) radially outwardly displaced from the valve hole (7), a diffusion chamber (39) providing communication between the valve hole (7) and the fuel injection holes (11) being provided between the valve seat member (3) and the injector plate (10), wherein the diffusion chamber (39) formed between the valve seat member (3) and the injector plate (10) is in an annular shape, has a diameter that is larger than that of the valve hole (7), and has inner ends of the fuel injection holes (11) opening therein, and a plurality of fuel passages (42a, 42b) are disposed within the valve hole (7), the plurality of fuel passages (42a, 42b) reversing within the valve hole (7)Type: ApplicationFiled: March 7, 2006Publication date: August 28, 2008Inventors: Ryuji Aoki, Daisuke Sato, Atsushi Kamahora, Akira Arioka
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Publication number: 20070272774Abstract: In a fuel injection valve, a fuel guide member facing the valve hole is connected to an injector plate, and an annular diffusion chamber is formed between a valve seat member and the injector plate. A pair of first notches, a pair of second notches, and a plurality of closing parts are formed in an outer periphery of the fuel guide member. The first notches are arranged on a first diameter line of the valve hole. The second notches are arranged on a second diameter line perpendicular to the first diameter line. The closing parts are provided between the first and second notches to partially close the valve hole. A plurality of fuel injection holes are dispersally arranged in outside regions corresponding to the closing parts and inside regions corresponding to the first notches.Type: ApplicationFiled: May 8, 2007Publication date: November 29, 2007Inventors: Daisuke Sato, Atsushi Kamahora, Akira Arioka, Ryuji Aoki