Patents by Inventor Akihiro Munakata
Akihiro Munakata 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: 9145860Abstract: A high-pressure fuel supply pump which has no probability of discontinuity of a thin film of fuel at a sliding portion even when the fuel is not needed to be compressed to a high pressure is obtained. Two low-pressure fuel ports are provided on the high-pressure fuel supply pump in addition to a high-pressure discharge port to a high-pressure fuel capacity chamber. One of the two low-pressure fuel ports is connected to a low-pressure fuel capacity chamber and remaining one is connected to a low-pressure fuel supply pump. Accordingly, the interior of the high-pressure fuel supply pump is always filled with fresh fuel even in a mode in which a high-pressure fuel injecting valve does not inject fuel and only a low-pressure fuel injection valve injects fuel, so that a temperature rise of a plunger and a cylinder is prevented and locking of the plunger and the cylinder can be prevented.Type: GrantFiled: August 20, 2010Date of Patent: September 29, 2015Assignee: Hitachi Automotive Systems, Ltd.Inventors: Satoshi Usui, Shigenori Tahara, Kenichiro Tokuo, Masashi Nemoto, Akihiro Munakata, Masayuki Suganami, Tatsuo Kawano
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Patent number: 8882475Abstract: High-response and high-power electromagnetically driven flow rate control valve with flange portion forming an attracting surface on an anchor, a first peripheral surface portion having a diameter smaller than the flange portion, and a cylindrical non-magnetic area opposing an outer peripheral surface of the flange portion with a third clearance interposed therebetween are provided, and a first fluid trap portion communicating with the back pressure chamber via the third clearance is provided. When the diameter of the flange portion is enlarged in order to enlarge the cross-sectional area of the attracting surface, fuel that is displaced by the anchor is increased, but is partly absorbed in the first fluid trap portion, so that the fuel passing through the fuel channel does not increase in comparison with fuel before the diameter of the flange portion is enlarged. Accordingly, the cross-sectional area of the attracting surface may be enlarged.Type: GrantFiled: August 16, 2010Date of Patent: November 11, 2014Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shunsuke Aritomi, Kenichiro Tokuo, Masayuki Suganami, Akihiro Munakata, Satoshi Usui
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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
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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
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Publication number: 20120312278Abstract: A high-pressure fuel supply pump which has no probability of discontinuity of a thin film of fuel at a sliding portion even when the fuel is not needed to be compressed to a high pressure is obtained. Two low-pressure fuel ports are provided on the high-pressure fuel supply pump in addition to a high-pressure discharge port to a high-pressure fuel capacity chamber. One of the two low-pressure fuel ports is connected to a low-pressure fuel capacity chamber and remaining one is connected to a low-pressure fuel supply pump. Accordingly, the interior of the high-pressure fuel supply pump is always filled with fresh fuel even in a mode in which a high-pressure fuel injecting valve does not inject fuel and only a low-pressure fuel injection valve injects fuel, so that a temperature rise of a plunger and a cylinder is prevented and locking of the plunger and the cylinder can be prevented.Type: ApplicationFiled: August 20, 2010Publication date: December 13, 2012Inventors: Satoshi Usui, Shigenori Tahara, Kenichiro Tokuo, Masashi Nemoto, Akihiro Munakata, Masayuki Suganami, Tatsuo Kawano
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Publication number: 20120301340Abstract: High-response and high-power electromagnetically driven flow rate control valve with flange portion forming an attracting surface on an anchor, a first peripheral surface portion having a diameter smaller than the flange portion, and a cylindrical non-magnetic area opposing an outer peripheral surface of the flange portion with a third clearance interposed therebetween are provided, and a first fluid trap portion communicating with the back pressure chamber via the third clearance is provided. When the diameter of the flange portion is enlarged in order to enlarge the cross-sectional area of the attracting surface, fuel that is displaced by the anchor is increased, but is partly absorbed in the first fluid trap portion, so that the fuel passing through the fuel channel does not increase in comparison with fuel before the diameter of the flange portion is enlarged. Accordingly, the cross-sectional area of the attracting surface may be enlarged.Type: ApplicationFiled: August 16, 2010Publication date: November 29, 2012Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Shunsuke Aritomi, Kenichiro Tokuo, Masayuki Suganami, Akihiro Munakata, Satoshi Usui
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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
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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
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Publication number: 20040237931Abstract: To maintain a favorable combustion states, the quantity and quality of a fuel-air mixture to be supplied to cylinders in an internal-combustion engine having multi-cylinder combustors, is where motor-driven fuel spraying mechanisms are provided corresponding to respective cylinders, is controlled with a high response. For this purpose, a mixture supply device has a motor-driven exhaust recirculating mechanism for collecting part of the exhaust generated by combustion in the internal-combustion engine and then remixing the exhaust into the mixture, and an integrated controller for transmitting control signals simultaneously to the above-mentioned three types of mechanisms which are built into a motor-driven multiple-throttle mechanism.Type: ApplicationFiled: March 10, 2004Publication date: December 2, 2004Inventors: Yoshio Okamoto, Tomonaga Oyamada, Makoto Yamakado, Teruhiko Minegishi, Akihiro Munakata, Yuzo Kadomukai, Masami Nagano, Takehiko Kowatari
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Patent number: 6520138Abstract: A rotating shaft and a drive shaft are used in an air intake apparatus for an internal combustion engine. At one end portion of the rotating shaft and the drive shaft a sphere portion and a projection portion are formed, and another end portion of the rotating shaft and the drive shaft a cup portion and a faucet portion are formed. The sphere portion is inserted to the cup portion and further the projection portion is engaged with the faucet portion, thereby a universal joint is formed. Since a connection structure between the rotating shaft and the drive shaft is constituted with few component elements, a cost reduction in the air intake apparatus for the internal combustion engine can be improved.Type: GrantFiled: December 28, 2000Date of Patent: February 18, 2003Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Teruhiko Minegishi, Misturu Yamashita, Hiroyuki Nemoto, Akihiro Munakata
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Publication number: 20010000573Abstract: A rotating shaft and a drive shaft are used in an air intake apparatus for an internal combustion engine. At one end portion of the rotating shaft and the drive shaft a sphere portion and a projection portion are formed, and another end portion of the rotating shaft and the drive shaft a cup portion and a faucet portion are formed. The sphere portion is inserted to the cup portion and further the projection portion is engaged with the faucet portion, thereby a universal joint is formed. Since a connection structure between the rotating shaft and the drive shaft is constituted with few component elements, a cost reduction in the air intake apparatus for the internal combustion engine can be improved.Type: ApplicationFiled: December 28, 2000Publication date: May 3, 2001Applicant: Hitachi, Ltd.Inventors: Teruhiko Minegishi, Misturu Yamashita, Hiroyuki Nemoto, Akihiro Munakata
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Patent number: 6196178Abstract: A rotating shaft and a drive shaft are used in an air intake apparatus for an internal combustion engine. At one end portion of the rotating shaft and the drive shaft a sphere portion and a projection portion are formed, and another end portion of the rotating shaft and the drive shaft a cup portion and a faucet portion are formed. The sphere portion is inserted to the cup portion and further the projection portion is engaged with the faucet portion, thereby a universal joint is formed. Since a connection structure between the rotating shaft and the drive shaft is constituted with few component elements, a cost reduction in the air intake apparatus for the internal combustion engine can be improved.Type: GrantFiled: April 14, 1999Date of Patent: March 6, 2001Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Teruhiko Minegishi, Misturu Yamashita, Hiroyuki Nemoto, Akihiro Munakata