Patents by Inventor Kenichirou Tokuo
Kenichirou Tokuo 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: 10941741Abstract: To increase a valve-opening pressure at which a pressure relief valve is opened in order to deal with a higher pressure of the fuel, a large pressure relief valve is installed in a high-pressure fuel supply pump. This upsizes the high-pressure fuel supply pump. A pressure relief valve is installed in a discharge joint. This can provide a high-pressure fuel supply pump that is not large too much and sufficiently performs a relief function by efficiently using the excessive space in the pump even when the fuel pressure is increased.Type: GrantFiled: April 17, 2015Date of Patent: March 9, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Masamichi Yagai, Atsushi Hohkita, Hiroyuki Yamada, Masayuki Suganami, Satoshi Usui, Atsuji Saito, Kenichirou Tokuo, Yuta Saso
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Patent number: 10851767Abstract: A pump for supplying high-pressure includes a plunger, a cylinder, a body, and a holder. The uppermost end surface of the cylinder is an end of the cylinder that is closest to the pressurizing chamber. A first gap formed between the outer periphery of the cylinder and the body in the radial direction is smaller than a second gap formed in the radial direction between the inner diameter of the pressurizing chamber and the outer diameter of the plunger. A radial gap is formed in an entire area of the cylinder in an axial direction thereof.Type: GrantFiled: January 3, 2019Date of Patent: December 1, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shunsuke Aritomi, Kenichirou Tokuo, Satoshi Usui, Shingo Tamura
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Patent number: 10294907Abstract: A high pressure fuel supply pump includes: an electromagnetic suction valve that adjusts an amount of fuel sucked into a pressuring chamber; a discharge valve that discharges the fuel from the pressuring chamber; and a plunger that makes a reciprocating motion in the pressuring chamber. The electromagnetic suction valve includes an electromagnetic coil, a suction valve, and a movable portion that is able to close the suction valve by a magnetic force when the electromagnetic coil is energized. The movable portion includes an anchor that is driven to close the suction valve by the magnetic force and stops at a fixed member, and a rod that is driven with the anchor and is able to move even after the anchor stops. The electromagnetic suction valve includes a first and second springs that bias the suction valve in closed and open direction, respectively, and a third spring in the rod.Type: GrantFiled: June 29, 2015Date of Patent: May 21, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Minoru Hashida, Hiroyuki Yamada, Satoshi Usui, Kenichirou Tokuo, Masayuki Suganami, Atsushi Hohkita, Masamichi Yagai
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Publication number: 20190136841Abstract: A pump for supplying high-pressure includes a plunger, a cylinder, a body, and a holder. The uppermost end surface of the cylinder is an end of the cylinder that is closest to the pressurizing chamber. A first gap formed between the outer periphery of the cylinder and the body in the radial direction is smaller than a second gap formed in the radial direction between the inner diameter of the pressurizing chamber and the outer diameter of the plunger. A radial gap is formed in an entire area of the cylinder in an axial direction thereof.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Inventors: Shunsuke ARITOMI, Kenichirou TOKUO, Satoshi USUI, Shingo TAMURA
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Patent number: 9890753Abstract: It is an object of the present invention to provide an electromagnetic valve structure improved in terms of the responsiveness of the electromagnetic valve and helping to realize a more accurate flow rate control, and to provide a high-pressure fuel supply pump in which the same is mounted. There is provided a high-pressure fuel supply pump having an electromagnetic valve equipped with an electromagnetic coil generating an electromagnetic force for opening and closing a valve body provided between a fuel intake path and a pressure chamber, a movable member operated by the electromagnetic force, a housing accommodating the movable member, and a back-pressure chamber formed between the housing and the movable member, wherein a first fuel path causing the back-pressure chamber to communicate with the intake path passes the center axis of the movable member.Type: GrantFiled: February 3, 2014Date of Patent: February 13, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shunsuke Aritomi, Hitoshi Konno, Yukio Takahashi, Masayuki Suganami, Katsumi Miyazaki, Kenichirou Tokuo
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Publication number: 20170356412Abstract: Provided is a solution to a problem on a discharge valve mechanism disposed at an exit of a pressurizing chamber of a high-pressure fuel supply pump, that is, an occurrence of a backward flow of the fuel concentrates on a limited fuel passage, leading to a higher fuel flow rate, and this easily induces the occurrence of cavitation, and collapse of the generated cavitation might damage a seat surface, making it difficult to maintain valve functions. The present invention provides a valve mechanism including a seat member having a seat section, a valve body configured to attach to or detached from the seat section, and a housing member arranged on an outer peripheral side of the seat member. A first fluid flow-path is formed to connect an inner peripheral side and an outer peripheral side of the seat section in a case where the valve is detached from the seat section.Type: ApplicationFiled: January 8, 2016Publication date: December 14, 2017Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Moritsugu AKIYAMA, Shigehiko OMATA, Shigenori TAHARA, Katsutoshi KOBAYASHI, Kenichirou TOKUO
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Patent number: 9797387Abstract: A high-pressure fuel supply pump includes a plunger, a valve member, a valve seat, a pressurizing chamber, and a fuel passage. The fuel passage includes a gap passage portion formed in a gap between the valve seat and the valve member. The fuel passage also includes a bent passage portion extending in a bent direction with respect to the gap passage portion, on the downstream side of the gap passage portion. The inner surface of the valve member, on a side thereof that faces the valve seat, has a convex shape in an area of the valve member that is between the bent passage portion and the gap passage portion.Type: GrantFiled: October 1, 2014Date of Patent: October 24, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shunsuke Aritomi, Satoshi Usui, Atsuji Saito, Tatsuo Kawano, Masayuki Suganami, Kenichirou Tokuo
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Publication number: 20170248110Abstract: A high pressure fuel supply pump includes: an electromagnetic suction valve that adjusts an amount of fuel sucked into a pressuring chamber; a discharge valve that discharges the fuel from the pressuring chamber; and a plunger that makes a reciprocating motion in the pressuring chamber. The electromagnetic suction valve includes an electromagnetic coil, a suction valve, and a movable portion that is able to close the suction valve by a magnetic force when the electromagnetic coil is energized. The movable portion includes an anchor that is driven to close the suction valve by the magnetic force and stops at a fixed member, and a rod that is driven with the anchor and is able to move even after the anchor stops. The electromagnetic suction valve includes a first and second springs that bias the suction valve in closed and open direction, respectively, and a third spring in the rod.Type: ApplicationFiled: June 29, 2015Publication date: August 31, 2017Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Minoru HASHIDA, Hiroyuki YAMADA, Satoshi USUI, Kenichirou TOKUO, Masayuki SUGANAMI, Atsushi HOHKITA, Masamichi YAGAI
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Publication number: 20170037822Abstract: To increase a valve-opening pressure at which a pressure relief valve is opened in order to deal with a higher pressure of the fuel, a large pressure relief valve is installed in a high-pressure fuel supply pump. This upsizes the high-pressure fuel supply pump. A pressure relief valve is installed in a discharge joint. This can provide a high-pressure fuel supply pump that is not large too much and sufficiently performs a relief function by efficiently using the excessive space in the pump even when the fuel pressure is increased.Type: ApplicationFiled: April 17, 2015Publication date: February 9, 2017Applicant: Hitachi Automotive Systems, LtdInventors: Masamichi YAGAI, Atsushi HOHKITA, Hiroyuki YAMADA, Masayuki SUGANAMI, Satoshi USUI, Atsuji SAITO, Kenichirou TOKUO, Yuta SASO
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Publication number: 20160290299Abstract: It is an object of the present invention to provide an electromagnetic valve structure improved in terms of the responsiveness of the electromagnetic valve and helping to realize a more accurate flow rate control, and to provide a high-pressure fuel supply pump in which the same is mounted. There is provided a high-pressure fuel supply pump having an electromagnetic valve equipped with an electromagnetic coil generating an electromagnetic force for opening and closing a valve body provided between a fuel intake path and a pressure chamber, a movable member operated by the electromagnetic force, a housing accommodating the movable member, and a back-pressure chamber formed between the housing and the movable member, wherein a first fuel path causing the back-pressure chamber to communicate with the intake path passes the center axis of the movable member.Type: ApplicationFiled: February 3, 2014Publication date: October 6, 2016Inventors: Shunsuke ARITOMI, Hitoshi KONNO, Yukio TAKAHASHI, Masayuki SUGANAMI, Katsumi MIYAZAKI, Kenichirou TOKUO
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Publication number: 20160281693Abstract: An object of the present invention is to reduce erosion due to cavitation in proximity to a valve seat in a high-pressure fuel supply pump including a fuel flow passage having a bent portion in proximity to the valve seat, formed therein. The high-pressure fuel supply pump includes fuel passages interconnecting with a pressurizing chamber of fuel in which volume varies due to reciprocating motion of a plunger to be in the reciprocation motion, and fluid valves formed on the fuel passage. The fuel valves are included in a valve seat and a valve member. The fuel passages include a gap passage portion formed in a gap between the valve seat and the valve member, and a bent passage portion extending in a bent direction on the downstream side of the gap passage portion.Type: ApplicationFiled: October 1, 2014Publication date: September 29, 2016Inventors: Shunsuke ARITOMI, Satoshi USUI, Atsuji SAITO, Tatsuo KAWANO, Masayuki SUGANAMI, Kenichirou TOKUO
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Publication number: 20150300338Abstract: A small-sized and simple sliding portion structure for suppressing the deformation of a sliding portion caused by discharge pressure and the external force in fixing, and a pump for supplying high-pressure fuel having the sliding portion structure mounted thereon is provided. A plunger type pump for supplying high-pressure fuel including a cylinder which forms a sliding portion, a plunger which is slidably provided in the cylinder and reciprocates with the rotation of a cam, and a holder member which urges the cylinder against a body, has a configuration in which the cylinder is provided with a holding unit separately from the sliding portion, the holding unit is urged in the direction of the body with an urging force in the axial direction of the sliding portion to form a high-pressure sealing portion, and the cylinder has the sliding portion with the plunger on the low-pressure side than the high-pressure sealing portion.Type: ApplicationFiled: October 9, 2013Publication date: October 22, 2015Inventors: Shunsuke Aritomi, Kenichirou Tokuo, Satoshi Usui, Shingo Tamura