Patents by Inventor Takuya WATAI
Takuya WATAI 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: 11873775Abstract: An injection amount variation of a plurality of fuel injection valves is reduced regardless of a state of an engine.Type: GrantFiled: November 4, 2020Date of Patent: January 16, 2024Assignee: HITACHI ASTEMO, LTD.Inventors: Fumihiro Itaba, Osamu Mukaihara, Takao Miyake, Takuya Watai
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Patent number: 11767926Abstract: To provide a fuel injection device capable of improving waterproof performance of the coil portion. A fuel injection device 1 includes a coil bobbin 51 disposed in a housing 70 and having a bobbin outer peripheral surface 51a that holds a coil 50 and a bobbin inner peripheral surface 51b that is a surface on an opposite side of the bobbin outer peripheral surface 51a, and a first outer peripheral surface 46a and a first outer peripheral surface 10b (guide portion) that come into contact with the bobbin inner peripheral surface 51b. A first space S1 and a second space S2 (internal space) are formed by the first outer peripheral surface 46a and the first outer peripheral surface 10b, and the bobbin inner peripheral surface 51b, and the first space S1 and the second space S2 communicate with a space filled with the connecting portion 80.Type: GrantFiled: May 19, 2021Date of Patent: September 26, 2023Assignee: Hitachi Astemo, Ltd.Inventors: Masashi Sugaya, Takao Miyake, Taisuke Sugii, Takuya Watai
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Publication number: 20230250889Abstract: To provide a fuel injection device capable of improving waterproof performance of the coil portion. A fuel injection device 1 includes a coil bobbin 51 disposed in a housing 70 and having a bobbin outer peripheral surface 51a that holds a coil 50 and a bobbin inner peripheral surface 51b that is a surface on an opposite side of the bobbin outer peripheral surface 51a, and a first outer peripheral surface 46a and a first outer peripheral surface 10b (guide portion) that come into contact with the bobbin inner peripheral surface 51b. A first space S1 and a second space S2 (internal space) are formed by the first outer peripheral surface 46a and the first outer peripheral surface 10b, and the bobbin inner peripheral surface 51b, and the first space S1 and the second space S2 communicate with a space filled with the connecting portion 80.Type: ApplicationFiled: May 19, 2021Publication date: August 10, 2023Inventors: Masashi SUGAYA, Takao MIYAKE, Taisuke SUGII, Takuya WATAI
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Publication number: 20230193868Abstract: A fuel injection device includes a nozzle element, an injection hole forming member, and a valve element. The injection hole forming member includes a seat part having the seat surface, and a suck chamber formed on a front end part of the seat part, the suck chamber being a recess denting in the direction of heading from the seat surface toward a front end part. The suck chamber has a suck chamber injection hole from which a fuel is jetted toward the ignition plug.Type: ApplicationFiled: May 13, 2021Publication date: June 22, 2023Inventors: Takuya WATAI, Takao MIYAKE, Taisuke SUGII, Masashi SUGAYA
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Patent number: 11629678Abstract: Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first mover 201 is attracted to a magnetic core 107. A second mover 202 is formed separately from the first mover 201, and is attracted to the magnetic core 107 on an inner diameter side of the first mover 201. A valve body 101 has a flange portion 101a on an upstream side of the second mover 202. A spacer 213 forms a gap (void g1) in an axial direction between the flange portion 101a and the second mover 202 in a valve closed state.Type: GrantFiled: January 24, 2019Date of Patent: April 18, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Akiyasu Miyamoto, Masashi Sugaya, Yasuo Namaizawa, Takuya Watai
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Publication number: 20220412282Abstract: An injection amount variation of a plurality of fuel injection valves is reduced regardless of a state of an engine.Type: ApplicationFiled: November 4, 2020Publication date: December 29, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Fumihiro ITABA, Osamu MUKAIHARA, Takao MIYAKE, Takuya WATAI
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Patent number: 11242830Abstract: Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve body 101 includes a sleeve 113. A first movable core 201 (first movable element) lifts the valve body 101 by the attractive force of a magnetic core 107. A second movable core 202 (second movable element) further lifts the valve body 101 by the attractive force of the magnetic core 107 after the first movable core 201 (first movable element) lifts the valve body 101. After the valve body 101 is seated on the seat member 102 and the second movable core 202 (second movable element) is separated from the sleeve 113, a bottom surface 201g of the first movable core 201 (first movable element) collides with a storage bottom surface 111b (collision receiving portion).Type: GrantFiled: September 28, 2018Date of Patent: February 8, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Akiyasu Miyamoto, Yasuo Namaizawa, Takao Miyake, Takuya Watai
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Publication number: 20210239081Abstract: Provided is a fuel injection valve capable of improving durability as compared with the conventional case and making the amount of fuel injected uniform as compared with the conventional case. Further, the present invention provides a fuel injection valve capable of injecting fuel with a high fuel pressure as compared with the conventional case and improving the reliability of the product as compared with the conventional case.Type: ApplicationFiled: August 8, 2019Publication date: August 5, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takuya WATAI, Takao MIYAKE, Masashi SUGAYA, Yasuo NAMAIZAWA
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Patent number: 10989105Abstract: A fuel injection device is provided with reduced adherence of fuel spray with respect to an intake valve, a wall surface in an engine cylinder, or a piston. The fuel injection device includes a valve body and a seat surface to perform sealing of fuel cooperatively and injection holes. Inlet opening surfaces are formed on the seat surface. A first injection hole and a second injection hole arranged closest to the first injection hole. The first injection hole is larger than the second injection hole in an injection hole angle to be an angle formed by a normal direction of the seat surface and a center axis of the injection hole. The second injection hole is larger than the first injection hole in an area of a cross-section perpendicular to the center axis of the injection hole.Type: GrantFiled: January 10, 2017Date of Patent: April 27, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Ryo Kusakabe, Takuya Watai, Shirou Yamaoka, Kiyotaka Ogura
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Publication number: 20210102520Abstract: Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first mover 201 is attracted to a magnetic core 107. A second mover 202 is formed separately from the first mover 201, and is attracted to the magnetic core 107 on an inner diameter side of the first mover 201. A valve body 101 has a flange portion 101a on an upstream side of the second mover 202. A spacer 213 forms a gap (void g1) in an axial direction between the flange portion 101a and the second mover 202 in a valve closed state.Type: ApplicationFiled: January 24, 2019Publication date: April 8, 2021Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Akiyasu MIYAMOTO, Masashi SUGAYA, Yasuo NAMAIZAWA, Takuya WATAI
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Publication number: 20200291910Abstract: Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve body 101 includes a sleeve 113. A first movable core 201 (first movable element) lifts the valve body 101 by the attractive force of a magnetic core 107. A second movable core 202 (second movable element) further lifts the valve body 101 by the attractive force of the magnetic core 107 after the first movable core 201 (first movable element) lifts the valve body 101. After the valve body 101 is seated on the seat member 102 and the second movable core 202 (second movable element) is separated from the sleeve 113, a bottom surface 201g of the first movable core 201 (first movable element) collides with a storage bottom surface 111b (collision receiving portion).Type: ApplicationFiled: September 28, 2018Publication date: September 17, 2020Applicant: Hitachi Automotive Systems, Ltd.Inventors: Akiyasu MIYAMOTO, Yasuo NAMAIZAWA, Takao MIYAKE, Takuya WATAI
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Publication number: 20190040790Abstract: An object of the present invention is to provide a fuel injection device in which fuel sprays hardly adhere to an intake valve, a wall surface in an engine cylinder, or a piston.Type: ApplicationFiled: January 10, 2017Publication date: February 7, 2019Applicant: Hitachi Automotive Systems, Ltd.Inventors: Ryo KUSAKABE, Takuya WATAI, Shirou YAMAOKA, Kiyotaka OGURA