Patents by Inventor Hideki Machimura
Hideki Machimura 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: 10718296Abstract: A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.Type: GrantFiled: August 24, 2018Date of Patent: July 21, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Masahiko Hayatani, Satoshi Usui, Hideki Machimura, Tatsuo Kawano, Syunsuke Aritomi, Shingo Tamura
-
Publication number: 20180363590Abstract: A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.Type: ApplicationFiled: August 24, 2018Publication date: December 20, 2018Applicant: Hitachi Automotive Systems, Ltd.Inventors: Masahiko HAYATANI, Satoshi USUI, Hideki MACHIMURA, Tatsuo KAWANO, Syunsuke ARITOMI, Shingo TAMURA
-
Patent number: 10087889Abstract: A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.Type: GrantFiled: November 28, 2012Date of Patent: October 2, 2018Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Masahiko Hayatani, Satoshi Usui, Hideki Machimura, Tatsuo Kawano, Syunsuke Aritomi, Shingo Tamura
-
Publication number: 20140377109Abstract: A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.Type: ApplicationFiled: November 28, 2012Publication date: December 25, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Masahiko Hayatani, Satoshi Usui, Hideki Machimura, Tatsuo Kawano, Syunsuke Aritomi, Shingo Tamura
-
Patent number: 8740579Abstract: A high-pressure fuel supply pump includes a discharge valve, which is a non-return valve between a pressurizing chamber and a discharge port. The discharge valve includes a valve body housing, a discharge valve spring, a valve body and a seat member. The discharge valve is a flat valve. When the valve is opened, a flow of fuel moving from the pressurizing chamber and axially colliding with the valve body is radially distributed in the radial direction of the valve body to become a flow directly moving the discharge ports and a flow colliding with an inner wall of the valve body housing before moving toward the discharge ports and then in a circumferential direction of the valve body.Type: GrantFiled: February 20, 2009Date of Patent: June 3, 2014Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shunsuke Aritomi, Hideki Machimura, Kiyotaka Ogura, Masami Abe, Kenichiro Tokuo
-
Patent number: 8672652Abstract: In order to provide a welded structure of and welding method for two metallic parts fitted together at a tubular section in a high-pressure fuel supply pump, an electric current is supplied to any of the welding connection surfaces formed between a pump housing and cylinder in a high-pressure fuel supply pump, between the pump housing and an installation flange, between the pump housing and an intake or discharge joint, between the pump housing and a pulsation-absorbing damper cover, between the pump housing and a relief valve mechanism, and between the pump housing and an electromagnetically driven intake valve mechanism. The two sections are pressed against each other to generate, along the connection surface, a plastic flow not causing melting or fusion due to heat, and form a diffusion-weld region at the connection surface by using the plastic flow and the application of the pressure.Type: GrantFiled: October 30, 2008Date of Patent: March 18, 2014Assignee: Hitachi, Ltd.Inventors: Akihiro Munakata, Hideki Machimura, Kazutaka Hosokawa
-
Patent number: 8366421Abstract: A fluid pressure pulsation damper mechanism includes: a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part overlapping along outer peripheries thereof, a main body having a damper housing in which the metal damper is accommodated, and a cover attached to the main body to cover the damper housing and isolate the damper housing from outside air.Type: GrantFiled: May 20, 2008Date of Patent: February 5, 2013Assignee: Hitachi, Ltd.Inventors: Akihiro Munakata, Hideki Machimura, Hideaki Yamauchi, Daisuke Kitajima, Masashi Nemoto
-
Patent number: 8162623Abstract: An object of the present invention is to reduce the pressure loss in a relief valve employed for a high-pressure liquid supply pump. Disclosed is a high-pressure liquid supply pump for pressurizing a liquid and supplying the pressurized liquid from a low-pressure side to a high-pressure side. The pump includes a relief path which releases the pressurized liquid from the high-pressure side to the low-pressure side, and a relief valve which is positioned in the relief path and equipped with an intermediate chamber, a valve seat positioned toward the high-pressure side of the intermediate chamber, a ball valve that is attachable to and detachable from the valve seat, and a ball valve retainer for pressing the ball valve against the valve seat. The relief path is configured so that an inflow path to the intermediate chamber and an outflow path from the intermediate chamber both produce a restriction effect.Type: GrantFiled: October 30, 2008Date of Patent: April 24, 2012Assignee: Hitachi, Ltd.Inventors: Shunsuke Aritomi, Noriyuki Maekawa, Hideki Machimura, Masashi Nemoto
-
Publication number: 20110123376Abstract: A high-pressure fuel supply pump mounted with a discharge valve that can reduce an influence of noise caused by a valve body-circumferential flow and a discharge valve unit used therein. The high-pressure fuel supply pump includes a discharge valve (8) which is a non-return valve between a pressurizing chamber (11) and a discharge port (13). The discharge valve (8) includes a valve body housing (8d), a discharge valve spring (8c), a valve body (8b) and a seat member (8a). The discharge valve (8) is a flat valve. When the valve is opened, a flow of fuel moving from the pressurizing chamber and axially colliding with the valve body is radially distributed in the radial direction of the valve body to become a flow directly moving the discharge ports and a flow colliding with an inner wall of the valve body housing before moving toward the discharge ports and then in a circumferential direction of the valve body.Type: ApplicationFiled: February 20, 2009Publication date: May 26, 2011Inventors: Shunsuke Aritomi, Hideki Machimura, Kiyotaka Ogura, Masami Abe, Kenichiro Tokuo
-
Publication number: 20090116976Abstract: An object of the present invention is to reduce the pressure loss in a relief valve employed for a high-pressure liquid supply pump. Disclosed is a high-pressure liquid supply pump for pressurizing a liquid and supplying the pressurized liquid from a low-pressure side to a high-pressure side. The pump includes a relief path which releases the pressurized liquid from the high-pressure side to the low-pressure side, and a relief valve which is positioned in the relief path and equipped with an intermediate chamber, a valve seat positioned toward the high-pressure side of the intermediate chamber, a ball valve that is attachable to and detachable from the valve seat, and a ball valve retainer for pressing the ball valve against the valve seat. The relief path is configured so that an inflow path to the intermediate chamber and an outflow path from the intermediate chamber both produce a restriction effect.Type: ApplicationFiled: October 30, 2008Publication date: May 7, 2009Applicant: HITACHI, LTD.Inventors: Shunsuke ARITOMI, Noriyuki Maekawa, Hideki Machimura, Masashi Nemoto
-
Publication number: 20090110575Abstract: An object of this invention is to provide such a welded structure of and welding method for two metallic parts fitted together at a tubular section in a high-pressure fuel supply pump, that enables rapid joining of both metallic parts by staking (press-fitting included), screw fastening, and/or laser welding, offers high welding strength and sufficient fluid sealability, and keeps the metallic materials free from thermal changes in composition.Type: ApplicationFiled: October 30, 2008Publication date: April 30, 2009Applicant: Hitachi, Ltd.Inventors: Akihiro MUNAKATA, Hideki Machimura, Kazutaka Hosokawa
-
Publication number: 20080289713Abstract: A fluid pressure pulsation damper mechanism comprising: a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part at which are overlapped along outer peripheries thereof; a main body having a damper housing in which the metal damper is accommodated; and a cover attached to the main body to cover the damper housing and isolate the damper housing from an outside air, the metal damper being held between the cover and the main body; wherein the cover is further comprising: a metal plate for making the cover, a peripheral edge of the cover being joined to the main body, a plurality of inner convex curved parts extending toward the main body and a plurality of outer convex curved parts extending in a direction away from the main body, and a plurality of the inner convex curved parts and a plurality of the outer convex parts being disposed alternately inside the peripheral edge of the cover at which thType: ApplicationFiled: May 20, 2008Publication date: November 27, 2008Applicant: Hitachi, Ltd.Inventors: Akihiro Munakata, Hideki Machimura, Hideaki Yamauchi, Daisuke Kitajima, Masashi Nemoto
-
Publication number: 20050178441Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: ApplicationFiled: April 12, 2005Publication date: August 18, 2005Applicant: HITACHI, LTD.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahasi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi
-
Patent number: 6895992Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: GrantFiled: October 30, 2002Date of Patent: May 24, 2005Assignee: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahashi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi
-
Patent number: 6860255Abstract: A fuel pump, of which sliding mechanism parts in its fuel chamber have good wear resistance under a severe environment, and a direct fuel injection engine using the fuel pump are provided. In a fuel pump for pressurizing and delivering fuel to a fuel injector of a vehicle engine, at least one of sliding surfaces of a slant plate, a slipper and a plunger sliding in a lubricating oil and at least one of sliding surfaces of sliding members of a plunger and a cylinder contacting with and sliding on each other through the fuel are formed of a hardened layer composed of any one of a nitrided layer, a carburization quenched layer and a carbonitrided layer, or coated with a high corrosion resistant and hard metal compound layer over the hardened layer.Type: GrantFiled: February 28, 2002Date of Patent: March 1, 2005Assignee: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Toshiaki Nagayama, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Hiroyuki Yamada, Yukio Takahashi, Masayoshi Kotaki, Kazuo Ojima
-
Patent number: 6783130Abstract: A seal mechanism with improved pressure tightness is provided to eliminate a return piping to a fuel tank used for reducing pressure applied to the seal mechanism in a high pressure fuel pump. The seal mechanism includes a stress reduction mechanism for reducing the stress generated at the junction between its retaining member and flexible member.Type: GrantFiled: August 30, 2001Date of Patent: August 31, 2004Assignee: Hitachi, Ltd.Inventors: Minoru Hashida, Hideki Machimura, Hideaki Yamauchi, Masayoshi Kotaki, Takefumi Yamamura
-
Publication number: 20040003713Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: ApplicationFiled: October 30, 2002Publication date: January 8, 2004Applicant: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahahsi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi
-
Publication number: 20030089343Abstract: A fuel pump, of which sliding mechanism parts in its fuel chamber have good wear resistance under a severe environment, and a direct fuel injection engine using the fuel pump are provided.Type: ApplicationFiled: February 28, 2002Publication date: May 15, 2003Applicant: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Toshiaki Nagayama, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Hiroyuki Yamada, Yukio Takahashi, Masayoshi Kotaki, Kazuo Ojima
-
Patent number: 6543424Abstract: In a fuel pump pressurizing fuel and supplying the fuel to a fuel injection valve of a vehicle engine, a hardened layer of at least one selected from a nitride layer, a carburated and quenched layer and a carbonitrided layer, and a metal compound layer, on a surface of the hardened layer, higher in corrosion resistance than the hardened layer are formed on one of slide surfaces contacting each other and sliding in fuel.Type: GrantFiled: August 14, 2000Date of Patent: April 8, 2003Assignee: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Yukio Takahashi, Yoshinobu Ono, Kazuo Ojima, Masayoshi Kotaki, Hiroyuki Yamada, Atsuji Saito
-
Publication number: 20030006564Abstract: A seal mechanism with improved pressure tightness is provided to eliminate a return piping to a fuel tank used for reducing pressure applied to the seal mechanism in a high pressure fuel pump. The seal mechanism includes a stress reduction mechanism for reducing the stress generated at the junction between its retaining member and flexible member.Type: ApplicationFiled: August 30, 2001Publication date: January 9, 2003Inventors: Minoru Hashida, Hideki Machimura, Hideaki Yamauchi, Masayoshi Kotaki, Takefumi Yamamura