Patents by Inventor Naofumi Adachi
Naofumi Adachi 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: 11193464Abstract: A fuel injection valve includes a needle valve that controls communication between a high pressure chamber and an injection hole, a follower valve provided inside a control chamber controlled by fuel pressure inside an intermediate chamber, and an open-close valve that controls communication between a first passage and a low pressure passage and communication between a second passage and the low pressure passage. The fuel injection valve is configured to control the gradient of the fuel injection rate from the injection hole with an improved configuration.Type: GrantFiled: February 20, 2020Date of Patent: December 7, 2021Assignee: DENSO CORPORATIONInventors: Hiroki Tanada, Naofumi Adachi, Masayuki Suzuki, Toshiaki Hijima, Motoya Kambara
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Publication number: 20200191104Abstract: A fuel injection valve includes a needle valve that controls communication between a high pressure chamber and an injection hole, a follower valve provided inside a control chamber controlled by fuel pressure inside an intermediate chamber, and an open-close valve that controls communication between a first passage and a low pressure passage and communication between a second passage and the low pressure passage. The fuel injection valve is configured to control the gradient of the fuel injection rate from the injection hole with an improved configuration.Type: ApplicationFiled: February 20, 2020Publication date: June 18, 2020Inventors: Hiroki TANADA, Naofumi ADACHI, Masayuki SUZUKI, Toshiaki HIJIMA, Motoya KAMBARA
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Patent number: 10637317Abstract: The present disclosure provides an electromagnetic actuator that drives an armature by an electromagnetic force. The electromagnetic actuator includes a stator, a coil, and an insulator. The stator is formed of a magnetic material and has a cylindrical portion. The coil is disposed outside of the stator. The coil generates a magnetic field when being energized. The insulator is disposed in a particular region of the stator facing the coil in a radial direction. The insulator extends partially along the stator in a circumferential direction and suppresses a current flowing through the stator in the circumferential direction. The stator is continuously formed entirely along the circumferential direction by the magnetic material.Type: GrantFiled: May 15, 2017Date of Patent: April 28, 2020Assignee: DENSO CORPORATIONInventors: Kazuya Sassa, Naofumi Adachi, Shingo Kitani
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Patent number: 10260467Abstract: A fuel injection valve includes a nozzle needle that opens or closes an injection hole communicating with an internal combustion engine, and a high-pressure fuel is introduced into a control room to urge the nozzle needle to close the injection hole. An orifice body includes a discharge passage through which the fuel is discharged from the control room to a low pressure portion, and an orifice-body sheet surface that is flat and surrounds a downstream end part of the discharge passage. A valve body contacts with or separates from the orifice-body sheet surface to close or open the discharge passage. A chamfered part is provided on a corner part in which the orifice-body sheet surface intersects with the discharge passage.Type: GrantFiled: June 23, 2016Date of Patent: April 16, 2019Assignee: DENSO CORPORATIONInventors: Ryuichi Ezaki, Naofumi Adachi
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Publication number: 20180115210Abstract: The present disclosure provides an electromagnetic actuator that drives an armature by an electromagnetic force. The electromagnetic actuator includes a stator, a coil, and an insulator. The stator is formed of a magnetic material and has a cylindrical portion. The coil is disposed outside of the stator. The coil generates a magnetic field when being energized. The insulator is disposed in a particular region of the stator facing the coil in a radial direction. The insulator extends partially along the stator in a circumferential direction and suppresses a current flowing through the stator in the circumferential direction. The stator is continuously formed entirely along the circumferential direction by the magnetic material.Type: ApplicationFiled: May 15, 2017Publication date: April 26, 2018Applicant: DENSO CORPORATIONInventors: Kazuya SASSA, Naofumi ADACHI, Shingo KITANI
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Patent number: 9651008Abstract: A sub out-orifice and an in-orifice are respectively formed in a low pressure passage and a high pressure passage of a fixed plate. A control valve is provided at an outlet port of the low pressure passage. In a normal control, the control valve starts its control-valve opening operation when a movable plate is in contact with the fixed plate. In an interval-shortening control, the control valve starts the control-valve opening operation at an earlier timing than that in the normal control, namely during a course in which a valve body is still in its valve-body closing operation.Type: GrantFiled: December 26, 2013Date of Patent: May 16, 2017Assignee: DENSO CORPORATIONInventor: Naofumi Adachi
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Publication number: 20170002782Abstract: A fuel injection valve includes a nozzle needle that opens or closes an injection hole communicating with an internal combustion engine, and a high-pressure fuel is introduced into a control room to urge the nozzle needle to close the injection hole. An orifice body includes a discharge passage through which the fuel is discharged from the control room to a low pressure portion, and an orifice-body sheet surface that is flat and surrounds a downstream end part of the discharge passage. A valve body contacts with or separates from the orifice-body sheet surface to close or open the discharge passage. A chamfered part is provided on a corner part in which the orifice-body sheet surface intersects with the discharge passage.Type: ApplicationFiled: June 23, 2016Publication date: January 5, 2017Inventors: Ryuichi EZAKI, Naofumi ADACHI
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Patent number: 9169813Abstract: A movable plate is movably accommodated in a pressure control chamber. A fixed plate is arranged above the movable plate, so that the movable plate is brought into contact with the fixed plate. The fixed plate has a high pressure passage for supplying fuel into the pressure control chamber and a low pressure passage for discharging the fuel from the pressure control chamber. A high pressure port and a low pressure port are formed at a lower end surface of the fixed plate. A first contacting surface is formed at the lower end surface and a first groove is formed in the first contacting surface for holding a part of fuel in a plate-contacted condition.Type: GrantFiled: October 16, 2013Date of Patent: October 27, 2015Assignee: DENSO CORPORATIONInventor: Naofumi Adachi
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Patent number: 9127629Abstract: A fuel injection device (100) includes a control body (40) provided with an injection hole (44), a nozzle needle (60) that opens or closes the injection hole (44), a pressure control chamber (53) controlling a movement of the nozzle needle (60), an inflow channel (52) through which high-pressure fuel is introduced to the pressure control chamber (53), an outflow channel (54) through which the fuel from the pressure control chamber (53) is discharged, and a floating plate (70) that opens or closes the inflow channel (52).Type: GrantFiled: March 31, 2011Date of Patent: September 8, 2015Assignee: DENSO CORPORATIONInventors: Masato Yamada, Yoichi Kobane, Naofumi Adachi, Tsukasa Yamashita
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Patent number: 9109556Abstract: A fuel injection device includes a cylinder defining a pressure chamber at an end portion of a nozzle needle. In the cylinder, a floating plate is provided as a controlling member of fuel pressure. An orifice member and a nozzle body are lined by an annular positioning member, using a circular peripheral surface of the orifice member and a circular peripheral surface of the nozzle body as a reference surface. Thereby, radial locations of the nozzle body and the orifice member are defined. Furthermore, a location of the floating plate is defined by the nozzle body with the nozzle needle. Therefore, the floating plate can be located to a proper location relative to the orifice member.Type: GrantFiled: December 16, 2011Date of Patent: August 18, 2015Assignee: DENSO CORPORATIONInventors: Naofumi Adachi, Tsukasa Yamashita
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Publication number: 20140174405Abstract: A sub out-orifice and an in-orifice are respectively formed in a low pressure passage and a high pressure passage of a fixed plate. A control valve is provided at an outlet port of the low pressure passage. In a normal control, the control valve starts its control-valve opening operation when a movable plate is in contact with the fixed plate. In an interval-shortening control, the control valve starts the control-valve opening operation at an earlier timing than that in the normal control, namely during a course in which a valve body is still in its valve-body closing operation.Type: ApplicationFiled: December 26, 2013Publication date: June 26, 2014Applicant: DENSO CORPORATIONInventor: Naofumi ADACHI
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Publication number: 20140131483Abstract: A movable plate is movably accommodated in a pressure control chamber. A fixed plate is arranged above the movable plate, so that the movable plate is brought into contact with the fixed plate. The fixed plate has a high pressure passage for supplying fuel into the pressure control chamber and a low pressure passage for discharging the fuel from the pressure control chamber. A high pressure port and a low pressure port are formed at a lower end surface of the fixed plate. A first contacting surface is formed at the lower end surface and a first groove is formed in the first contacting surface for holding a part of fuel in a plate-contacted condition.Type: ApplicationFiled: October 16, 2013Publication date: May 15, 2014Applicant: DENSO CORPORATIONInventor: Naofumi ADACHI
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Patent number: 8708250Abstract: A fuel injection device includes a cylinder that defines a pressure chamber at an end portion of a nozzle needle. A floating plate as a control member is placed in the cylinder. A cutout portion and multiple grooves are formed in the floating plate. The cutout portion and the grooves causes a gap between a large-diameter inner circumferential surface and an outer circumferential surface to communicate with the pressure chamber. The cutout portion and the grooves reduce a contact surface portion between the cylinder and the floating plate and divide the contact surface portion into multiple island portions. As a result, it is possible to reduce the contact surface portion.Type: GrantFiled: January 4, 2012Date of Patent: April 29, 2014Assignee: Denso CorporationInventors: Tsukasa Yamashita, Naofumi Adachi
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Patent number: 8695892Abstract: In a fuel injection device, a control body has a pressure control chamber, an inflow port and an outflow port. The inflow port and the outflow port are opened at an abutting surface exposed to the pressure control chamber. In the pressure control chamber is arranged a floating plate for pressing the abutting surface by a pressing surface with the pressure of the fuel to interrupt communication between the inflow port and the pressure control chamber. The abutting surface of the control body is provided with an outer opposite surface portion opposite to an outer edge of the pressing surface in a displacement axis direction of the floating plate, and the outer opposite surface portion has a special depressed portion that is depressed in the displacement axis direction and that extends along the shape of the outer edge of the pressing surface.Type: GrantFiled: February 8, 2011Date of Patent: April 15, 2014Assignee: Denso CorporationInventors: Yoichi Kobane, Shuichi Matsumoto, Naofumi Adachi, Tsukasa Yamashita, Fumihiro Fujikake
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Patent number: 8602328Abstract: The invention has an object for improving response of a fuel injection device. A flow-in recessed portion and a flow-out recessed portion are formed at a press-contacting surface of a floating plate, which is movably accommodated in a pressure control chamber. A flow-in port and a flow-out port are formed at a pressure control surface of a valve body. The flow-in port is opened to the flow-in recessed portion, while the flow-out port is opened to the flow-out recessed portion. When the floating plate is moved upwardly and the press-contacting surface is brought into contact with the pressure control surface, the flow-in port is surely closed.Type: GrantFiled: June 2, 2010Date of Patent: December 10, 2013Assignee: Denso CorporationInventors: Naofumi Adachi, Shuichi Matsumoto, Keisuke Suzuki, Tomoyuki Tsuda, Yoichi Kobane, Yoshinori Okuno
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Patent number: 8544767Abstract: A fuel injection device has therein a recovery channel provided in a first valve body, and a fuel channel provided in the first valve body and a second valve body. The fuel channel is opened by openings at a first end surface of the first valve body and a second end surface of the second valve body. One of the first end surface and the second end surface is provided with an end surface groove connected to the recovery channel. In the fuel injection device, the end surface groove is provided to enclose at least a part of the opening and is separated from the opening by a clearance, and one of the first valve body and the second valve body has a side surface groove extending in a circumferential direction at an outer periphery of the one of the first valve body and the second valve body.Type: GrantFiled: July 11, 2011Date of Patent: October 1, 2013Assignee: Denso CorporationInventors: Naofumi Adachi, Tsukasa Yamashita
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Publication number: 20120175435Abstract: A fuel injection device includes a cylinder that defines a pressure chamber at an end portion of a nozzle needle. A floating plate as a control member is placed in the cylinder. A cutout portion and multiple grooves are formed in the floating plate. The cutout portion and the grooves causes a gap between a large-diameter inner circumferential surface and an outer circumferential surface to communicate with the pressure chamber. The cutout portion and the grooves reduce a contact surface portion between the cylinder and the floating plate and divide the contact surface portion into multiple island portions. As a result, it is possible to reduce the contact surface portion.Type: ApplicationFiled: January 4, 2012Publication date: July 12, 2012Applicant: DENSO CORPORATIONInventors: Tsukasa YAMASHITA, Naofumi Adachi
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Publication number: 20120152206Abstract: A fuel injection device includes a cylinder defining a pressure chamber at an end portion of a nozzle needle. In the cylinder, a floating plate is provided as a controlling member of fuel pressure. An orifice member and a nozzle body are lined by an annular positioning member, using a circular peripheral surface of the orifice member and a circular peripheral surface of the nozzle body as a reference surface. Thereby, radial locations of the nozzle body and the orifice member are defined. Furthermore, a location of the floating plate is defined by the nozzle body with the nozzle needle. Therefore, the floating plate can be located to a proper location relative to the orifice member.Type: ApplicationFiled: December 16, 2011Publication date: June 21, 2012Applicant: DENSO CORPORATIONInventors: Naofumi ADACHI, Tsukasa YAMASHITA
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Publication number: 20120042852Abstract: A fuel injection device (100) includes a control body (40) provided with an injection hole (44), a nozzle needle (60) that opens or closes the injection hole (44), a pressure control chamber (53) controlling a movement of the nozzle needle (60), an inflow channel (52) through which high-pressure fuel is introduced to the pressure control chamber (53), an outflow channel (54) through which the fuel from the pressure control chamber (53) is discharged, and a floating plate (70) that opens or closes the inflow channel (52).Type: ApplicationFiled: March 31, 2011Publication date: February 23, 2012Inventors: Masato Yamada, Yoichi Kobane, Naofumi Adachi, Tukasa Yamashita
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Publication number: 20120012680Abstract: A fuel injection device has therein a recovery channel provided in a first valve body, and a fuel channel provided in the first valve body and a second valve body. The fuel channel is opened by openings at a first end surface of the first valve body and a second end surface of the second valve body. One of the first end surface and the second end surface is provided with an end surface groove connected to the recovery channel. In the fuel injection device, the end surface groove is provided to enclose at least a part of the opening and is separated from the opening by a clearance, and one of the first valve body and the second valve body has a side surface groove extending in a circumferential direction at an outer periphery of the one of the first valve body and the second valve body.Type: ApplicationFiled: July 11, 2011Publication date: January 19, 2012Applicant: DENSO CORPORATIONInventors: Naofumi Adachi, Tsukasa Yamashita