Patents by Inventor Shinobu OIKAWA
Shinobu OIKAWA 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: 10941739Abstract: A gap forming member has: a plate portion that is placed on an opposite side of a needle, which is opposite from a valve seat; and an extending portion that is formed to extend from the plate portion toward the valve seat, while an opposite end part of the extending portion, which is opposite from the plate portion, is contactable with a movable core. A first wall surface of the gap forming member, which is a wall surface opposed to an outer wall of the flange, is slidable relative to the outer wall of the flange, and a second wall surface of the gap forming member, which is a wall surface opposed to an inner wall of a stationary core, forms a radial gap, which is a gap in a radial direction, between the second wall surface and the inner wall of the stationary core.Type: GrantFiled: April 19, 2019Date of Patent: March 9, 2021Assignee: DENSO CORPORATIONInventors: Shinobu Oikawa, Tomoji Matsukawa, Shinsuke Yamamoto, Moriyasu Gotoh, Eiji Itoh
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Patent number: 10883463Abstract: A housing-includes a pressurizing chamber. A plunger is moved to increase and decrease a volume of the pressurizing chamber, so that the plunger can pressurize the fuel in the pressurizing chamber. A fuel chamber forming portion is placed on a radially outer side of the plunger and forms a fuel chamber that is communicated with the pressurizing chamber. A pulsation damper is placed in an inside of the fuel chamber and is operable to reduce pressure pulsation of the fuel in the fuel chamber. Fixable portions are placed on a radially outer side of the plunger while each of the fixable portions includes a receiving through-hole. The fixable portions are fixed to an engine with bolts, which are provided to correspond with the receiving through-holes, respectively. The fuel chamber forming portion is displaced from axes of the receiving through-holes.Type: GrantFiled: March 30, 2017Date of Patent: January 5, 2021Assignee: DENSO CORPORATIONInventors: Shinichiro Koshimoto, Masaharu Nakaoka, Shinobu Oikawa
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Patent number: 10808662Abstract: An inner side wall surface of a gap forming member, which is opposed to a flange outer wall surface of a flange of a needle, is slidable relative to the flange outer wall surface. Also, an outer side wall surface of the gap forming member, which is opposed to a stationary core inner wall surface of a stationary core, is slidable relative to the stationary core inner wall surface. The flange outer wall surface and the outer side wall surface are curved to project in a radially outer direction of a housing in a cross section thereof taken along an imaginary plane, which includes an axis of the housing.Type: GrantFiled: June 21, 2016Date of Patent: October 20, 2020Assignee: DENSO CORPORATIONInventors: Shinsuke Yamamoto, Shinobu Oikawa, Tomoji Matsukawa, Moriyasu Gotoh, Eiji Itoh
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Publication number: 20190242347Abstract: A gap forming member has: a plate portion that is placed on an opposite side of a needle, which is opposite from a valve seat; and an extending portion that is formed to extend from the plate portion toward the valve seat, while an opposite end part of the extending portion, which is opposite from the plate portion, is contactable with a movable core. A first wall surface of the gap forming member, which is a wall surface opposed to an outer wall of the flange, is slidable relative to the outer wall of the flange, and a second wall surface of the gap forming member, which is a wall surface opposed to an inner wall of a stationary core, forms a radial gap, which is a gap in a radial direction, between the second wall surface and the inner wall of the stationary core.Type: ApplicationFiled: April 19, 2019Publication date: August 8, 2019Inventors: Shinobu OIKAWA, Tomoji MATSUKAWA, Shinsuke YAMAMOTO, Moriyasu GOTOH, Eiji ITOH
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Patent number: 10309356Abstract: A gap forming member has: a plate portion that is placed on an opposite side of a needle, which is opposite from a valve seat; and an extending portion that is formed to extend from the plate portion toward the valve seat, while an opposite end part of the extending portion, which is opposite from the plate portion, is contactable with a movable core. A first wall surface of the gap forming member, which is a wall surface opposed to an outer wall of the flange, is slidable relative to the outer wall of the flange, and a second wall surface of the gap forming member, which is a wall surface opposed to an inner wall of a stationary core, forms a radial gap, which is a gap in a radial direction, between the second wall surface and the inner wall of the stationary core.Type: GrantFiled: June 21, 2016Date of Patent: June 4, 2019Assignee: DENSO CORPORATIONInventors: Shinobu Oikawa, Tomoji Matsukawa, Shinsuke Yamamoto, Moriyasu Gotoh, Eiji Itoh
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Patent number: 10302057Abstract: A movable core is movable relative to a needle main body of a needle. A stationary core is placed on an opposite side of the movable core, which is opposite from a valve seat. A spring is operable to urge the needle and the movable core toward the valve seat. A spring seat is shaped into a ring form and is placed on a radially outer side of the needle main body at the valve seat side of the movable core. The spring is placed between the movable core and the spring seat and is operable to urge the movable core toward the stationary core. A guide is placed on the valve seat side of the movable core in an inside of a housing. An outer wall of the spring seat is slidable relative to an inner wall of the guide to guide reciprocation of the needle.Type: GrantFiled: June 21, 2016Date of Patent: May 28, 2019Assignee: DENSO CORPORATIONInventors: Shinsuke Yamamoto, Shinobu Oikawa, Tomoji Matsukawa, Moriyasu Gotoh, Eiji Itoh
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Publication number: 20190145364Abstract: A housing-includes a pressurizing chamber. A plunger is moved to increase and decrease a volume of the pressurizing chamber, so that the plunger can pressurize the fuel in the pressurizing chamber. A fuel chamber forming portion is placed on a radially outer side of the plunger and forms a fuel chamber that is communicated with the pressurizing chamber. A pulsation damper is placed in an inside of the fuel chamber and is operable to reduce pressure pulsation of the fuel in the fuel chamber. Fixable portions are placed on a radially outer side of the plunger while each of the fixable portions includes a receiving through-hole. The fixable portions are fixed to an engine with bolts, which are provided to correspond with the receiving through-holes, respectively. The fuel chamber forming portion is displaced from axes of the receiving through-holes.Type: ApplicationFiled: March 30, 2017Publication date: May 16, 2019Inventors: Shinichiro KOSHIMOTO, Masaharu NAKAOKA, Shinobu OIKAWA
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Patent number: 10208726Abstract: An inside projection is formed in one piece with a second tubular member and projects in a tubular form toward a third tubular member, and an outside projection is formed in one piece with the third tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection. Another inside projection is formed in one piece with the second tubular member and projects in a tubular form toward a first tubular member, and another outside projection is formed in one piece with the first tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection.Type: GrantFiled: May 12, 2016Date of Patent: February 19, 2019Assignee: DENSO CORPORATIONInventors: Shinobu Oikawa, Eiji Mimura
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Publication number: 20190024618Abstract: An inner side wall surface of a gap forming member, which is opposed to a flange outer wall surface of a flange of a needle, is slidable relative to the flange outer wall surface. Also, an outer side wall surface of the gap forming member, which is opposed to a stationary core inner wall surface of a stationary core, is slidable relative to the stationary core inner wall surface. The flange outer wall surface and the outer side wall surface are curved to project in a radially outer direction of a housing in a cross section thereof taken along an imaginary plane, which includes an axis of the housing.Type: ApplicationFiled: June 21, 2016Publication date: January 24, 2019Inventors: Shinsuke YAMAMOTO, Shinobu OIKAWA, Tomoji MATSUKAWA, Moriyasu GOTOH, Eiji ITOH
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Patent number: 10119505Abstract: A high pressure pump includes a pressurization portion, a discharge portion, a body portion, a valve member, an urging member, valve hold member and a limiting portion. The body portion includes a relief passage, an inlet, a valve seat, and an outlet. The valve member includes a large diameter portion and a small diameter portion. The small diameter portion is located between the valve seat and the large diameter portion and has an outer diameter smaller than an outer diameter of the large diameter portion. The valve hold member surrounding and holding the large diameter portion. The limiting portion capable of limiting a motion of the valve hold member in a separation direction. According to this, a pressure in a fuel rail from extraordinarily increasing again after the relief valve is opened once.Type: GrantFiled: June 30, 2016Date of Patent: November 6, 2018Assignee: DENSO CORPORATIONInventors: Kaoru Oda, Shinichiro Koshimoto, Shinobu Oikawa
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Publication number: 20180257006Abstract: A suction filter which filters fuel inside a fuel tank of a vehicle to let a fuel pump draw filtered fuel into an inlet port includes a filter element disposed inside the fuel tank and filtering stored fuel stored in the fuel tank by allowing the stored fuel to pass through to an inner space, and a partition wall element disposed in a posture with which to divide the inner space to a first space where filtered fuel filtered at the filter element flows in and a second space where the inlet port into which the filtered fuel is drawn opens, and allowing the filtered fuel in the first space to pass through to the second space. The partition wall element is provided in a form of a partition film dividing the inner space to the first space on an upper side and the second space on a lower side.Type: ApplicationFiled: January 13, 2016Publication date: September 13, 2018Inventors: Norihiro HAYASHI, Shinobu OIKAWA, Kiyoshi NAGATA, Tetsuro OKAZONO
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Publication number: 20180245557Abstract: A gap forming member has: a plate portion that is placed on an opposite side of a needle, which is opposite from a valve seat; and an extending portion that is formed to extend from the plate portion toward the valve seat, while an opposite end part of the extending portion, which is opposite from the plate portion, is contactable with a movable core. A first wall surface of the gap forming member, which is a wall surface opposed to an outer wall of the flange, is slidable relative to the outer wall of the flange, and a second wall surface of the gap forming member, which is a wall surface opposed to an inner wall of a stationary core, forms a radial gap, which is a gap in a radial direction, between the second wall surface and the inner wall of the stationary core.Type: ApplicationFiled: June 21, 2016Publication date: August 30, 2018Inventors: Shinobu OIKAWA, Tomoji MATSUKAWA, Shinsuke YAMAMOTO, Moriyasu GOTOH, Eiji ITOH
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Publication number: 20180238282Abstract: A movable core is movable relative to a needle main body of a needle. A stationary core is placed on an opposite side of the movable core, which is opposite from a valve seat. A spring is operable to urge the needle and the movable core toward the valve seat. A spring seat is shaped into a ring form and is placed on a radially outer side of the needle main body at the valve seat side of the movable core. The spring is placed between the movable core and the spring seat and is operable to urge the movable core toward the stationary core. A guide is placed on the valve seat side of the movable core in an inside of a housing. An inner wall of the guide is slidable relative to an outer wall of the spring seat to guide reciprocation of the needle.Type: ApplicationFiled: June 21, 2016Publication date: August 23, 2018Inventors: Shinsuke YAMAMOTO, Shinobu OIKAWA, Tomoji MATSUKAWA, Moriyasu GOTOH, Eiji ITOH
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Patent number: 10030650Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.Type: GrantFiled: October 1, 2015Date of Patent: July 24, 2018Assignee: DENSO CORPORATIONInventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
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Publication number: 20180142656Abstract: An inside projection is formed in one piece with a second tubular member and projects in a tubular form toward a third tubular member, and an outside projection is formed in one piece with the third tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection. Another inside projection is formed in one piece with the second tubular member and projects in a tubular form toward a first tubular member, and another outside projection is formed in one piece with the first tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection.Type: ApplicationFiled: May 12, 2016Publication date: May 24, 2018Inventors: Shinobu OIKAWA, Eiji MIMURA
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Patent number: 9932949Abstract: A partitioning portion partitions a fuel chamber into a first space, which receives a pressurizing chamber forming portion and is communicated with an inflow pipe, and a second space, which is communicated with an outflow pipe. A flow passage forming portion extends from the partitioning portion toward the first space side and forms a communicating flow passage, which communicates between the first space and the second space. Thereby, vapor contained in the fuel, which is returned from a pressurizing chamber to the fuel chamber, is accumulated as bubbles in the first space, which receives the pressurizing chamber forming portion. The first space is communicated with the outside through the communicating flow passage and the second space. Therefore, outputting of air bubbles of the first space to the outside can be effectively limited in comparison to a case where the fuel chamber is directly communicated with the outside.Type: GrantFiled: October 30, 2015Date of Patent: April 3, 2018Assignee: DENSO CORPORATIONInventors: Tetsuharu Matsuo, Hiroatsu Yamada, Noriya Matsumoto, Seiji Tanizawa, Shinobu Oikawa
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Patent number: 9926926Abstract: A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.Type: GrantFiled: January 6, 2016Date of Patent: March 27, 2018Assignee: DENSO CORPORATIONInventors: Masatoshi Kuroyanagi, Mamoru Urushizaki, Yasuaki Matsunaga, Shinobu Oikawa, Noriya Matsumoto
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Publication number: 20180010562Abstract: A plunger of a high-pressure pump is provided reciprocatably on an inner side of a cylinder. A holder disposed on an opposite side of the cylinder from a pressurizing chamber includes a large tubular portion that provides a predetermined space between the large tubular portion and an outer wall of the plunger, and a small tubular portion that is disposed on an opposite side of the large tubular portion from the cylinder. A pin inserted into a hole of the plunger at a position corresponding to the large tubular portion protrudes radially outward from the outer wall of the plunger and is accommodated in a space on an inner side of the large tubular portion.Type: ApplicationFiled: January 13, 2016Publication date: January 11, 2018Inventors: Shinobu OIKAWA, Masaharu NAKAOKA
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Publication number: 20170254304Abstract: In a fuel injection valve, when a regulating unit provided in a needle abuts against a movable core, a gap is defined between a flange portion end face of a flange portion and a movable core first end face of the movable core. With the above configuration, when a coil develops a magnetic field, because the movable core abuts against a flange portion while accelerating in a valve-opening direction, a relatively large force is exerted on the needle in the valve-opening direction. The needle is further moved in the valve-opening direction by an urging force of a second spring after the movable core has abutted against the fixed core. With the above configuration, a lift quantity of the needle is longer than a distance by which the movable core moves until the movable core abuts against a fixed core abutting portion since the movable core abuts against the flange portion. As a result, the lift quantity of the needle can be increased without any increase in the electric power to be supplied to the coil.Type: ApplicationFiled: September 14, 2015Publication date: September 7, 2017Inventors: Shinsuke YAMAMOTO, Shinobu OIKAWA
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Publication number: 20170002779Abstract: A high pressure pump includes a pressurization portion, a discharge portion, a body portion, a valve member, an urging member, valve hold member and a limiting portion. The body portion includes a relief passage, an inlet, a valve seat, and an outlet. The valve member includes a large diameter portion and a small diameter portion. The small diameter portion is located between the valve seat and the large diameter portion and has an outer diameter smaller than an outer diameter of the large diameter portion. The valve hold member surrounding and holding the large diameter portion. The limiting portion capable of limiting a motion of the valve hold member in a separation direction. According to this, a pressure in a fuel rail from extraordinarily increasing again after the relief valve is opened once.Type: ApplicationFiled: June 30, 2016Publication date: January 5, 2017Inventors: Kaoru ODA, Shinichiro KOSHIMOTO, Shinobu OIKAWA