Patents by Inventor Kenichi Fukumura
Kenichi Fukumura 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: 7721617Abstract: A method of heat-treating a rack bar includes a step of continuously conveying a rack bar provided with a rack teeth portion and a ball screw portion by a quenching means, and a step of sequentially applying a quenching treatment to each circumferential surface of the rack teeth portion and the ball screw portion. The quenching treatment is preferably and sequentially applied to each entire circumferential surface of the rack teeth portion and the ball screw portion.Type: GrantFiled: June 6, 2003Date of Patent: May 25, 2010Assignee: JTEKT CorporationInventor: Kenichi Fukumura
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Patent number: 7433767Abstract: A first system and a second system include a first motor and a second motor for driving a steering mechanism in dependence on the rotational manipulation of a steering wheel. A first ECU and a second ECU mutually monitor abnormalities of the systems each to stop an abnormal system. When the respective systems are normal, the first ECU and the second ECU drivingly control the first motor and the second motor of their own systems to drive the steering mechanism by cooperation of the respective motors. When either one of the both systems is abnormal, the ECU of the other system solely drivingly controls the motor of its own system thereby to drive the steering mechanism. Thus, it can be realized to make the systems low in cost irrespective of the provision of the plural systems.Type: GrantFiled: June 12, 2003Date of Patent: October 7, 2008Assignee: JTEKT CorporationInventors: Shinji Takeuchi, Jiro Nakano, Kenichi Fukumura, Yutaka Mori
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Publication number: 20050159866Abstract: A first system and a second system include a first motor and a second motor for driving a steering mechanism in dependence on the rotational manipulation of a steering wheel. A first ECU and a second ECU mutually monitor abnormalities of the systems each to stop an abnormal system. When the respective systems are normal, the first ECU and the second ECU drivingly control the first motor and the second motor of their own systems to drive the steering mechanism by cooperation of the respective motors. When either one of the both systems is abnormal, the ECU of the other system solely drivingly controls the motor of its own system thereby to drive the steering mechanism. Thus, it can be realized to make the systems low in cost irrespective of the provision of the plural systems.Type: ApplicationFiled: June 12, 2003Publication date: July 21, 2005Applicant: TOYODA KOKI KABUSHIKE KAISHAInventors: Shinji Takeuchi, Jiro Nakano, Kenichi Fukumura, Yutaka Mori
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Publication number: 20040007801Abstract: A method of heat-treating a rack bar includes a step of continuously conveying a rack bar provided with a rack teeth portion and a ball screw portion by a quenching means, and a step of sequentially applying a quenching treatment to each circumferential surface of the rack teeth portion and the ball screw portion. The quenching treatment is preferably and sequentially applied to each entire circumferential surface of the rack teeth portion and the ball screw portion.Type: ApplicationFiled: June 6, 2003Publication date: January 15, 2004Applicant: TOYODA KOKI KABUSHIKI KAISHAInventor: Kenichi Fukumura
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Publication number: 20030066372Abstract: A deflector type ball screw includes a screw shaft having an external thread groove in an outer peripheral surface, a ball nut having an internal thread groove in an inner peripheral surface and a plurality of balls that are rollably housed between the internal thread groove and the external thread groove, and four deflectors fixed to the ball nut. The deflectors function as by-passes linking adjacent internal thread grooves of the ball nut. As a result of the deflectors guiding the balls, the screw groove of the ball nut is divided into four circulation passages.Type: ApplicationFiled: September 17, 2002Publication date: April 10, 2003Applicant: TOYODA KOKI KABUSHIKI KAISHAInventors: Tsune Kobayashi, Toshiya Ishigami, Kenichi Fukumura
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Patent number: 6379403Abstract: An electrode sheet having a current collector coated with electrode depolarizing mix on both upper and lower surfaces of the current collector, wherein: the electrode sheet has a portion of the current collector not coated with the electrode depolarizing mix; and the electrode depolarizing mix coated ends on both the upper and lower surfaces of the current collector are shifted by 0.3 mm or longer and 30 mm or shorter in a longitudinal direction of the electrode sheet.Type: GrantFiled: November 30, 1999Date of Patent: April 30, 2002Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenichi Fukumura, Hideki Tomiyama, Mitsutoshi Tanaka
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Patent number: 6334503Abstract: An electrically operated power steering apparatus for an automotive vehicle having a steering wheel to be operated by the vehicle operator includes a motor and a power supply restricting device. The motor applies a drive force thereof to a torque transmitting system so as to assist a steering torque applied to the steering wheel by the vehicle operator.Type: GrantFiled: June 5, 2000Date of Patent: January 1, 2002Assignee: Toyoda Koki Kabushiki KaishaInventors: Kenichi Fukumura, Hajime Kamimae
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Patent number: 6234225Abstract: A cell electrode of a stripe rectangle shape having at least one electrode depolarizing mix layer on a current collector. A thickness of one end portion of the electrode depolarizing mix layer is thicker than an average thickness of the electrode depolarizing mix layer by 2 to 25%.Type: GrantFiled: March 7, 2000Date of Patent: May 22, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsutoshi Tanaka, Masashi Ishiyama, Yasuo Aotsuka, Seiji Ishizuka, Kenichi Fukumura, Yoshinobu Katagiri
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Patent number: 6054010Abstract: A method of making a cell electrode of a stripe rectangle shape having at least one electrode depolarizing mix layer on a current collector. A thickness of one end portion of the electrode depolarizing mix layer is thicker than an average thickness of the electrode depolarizing mix layer by 2 to 25%. The method comprises sequentially bond adhesive tape pieces to a strip conductive sheet, coating on electrode depolarizing mix solution on the surface of the stripe conductive sheet and peeling off the adhesive tape piece.Type: GrantFiled: August 26, 1999Date of Patent: April 25, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsutoshi Tanaka, Masashi Ishiyama, Yasuo Aotsuka, Seiji Ishizuka, Kenichi Fukumura, Yoshinobu Katagiri
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Patent number: 6027835Abstract: An electrode sheet having a current collector coated with electrode depolarizing mix on both upper and lower surfaces of the current collector, wherein: the electrode sheet has a portion of the current collector not coated with the electrode depolarizing mix; and the electrode depolarizing mix coated ends on both the upper and lower surfaces of the current collector are shifted by 0.3 mm or longer and 30 mm or shorter in a longitudinal direction of the electrode sheet.Type: GrantFiled: December 10, 1997Date of Patent: February 22, 2000Assignees: Fuji Film Celltec Co., Ltd., Fuji Photo Film Co., Ltd.Inventors: Kenichi Fukumura, Hideki Tomiyama, Mitsutoshi Tanaka
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Patent number: 5989747Abstract: A cell electrode of a stripe rectangle shape having at least one electrode depolarizing mix layer on a current collector. The thickness of two end portions of the electrode depolarizing mix layer are thicker than an average thickness of the electrode depolarizing mix layer by 2 to 25%.Type: GrantFiled: July 10, 1997Date of Patent: November 23, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsutoshi Tanaka, Masashi Ishiyama, Yasuo Aotsuka, Seiji Ishizuka, Kenichi Fukumura, Yoshinobu Katagiri
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Patent number: 5834052Abstract: A method for producing an electrode sheet having a multilayer structure is disclosed, wherein two or more layers for an electrode sheet are simultaneously coated with a coating solution by using a coater.Type: GrantFiled: December 6, 1996Date of Patent: November 10, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenichi Fukumura, Masashi Ishiyama, Seiji Ishizuka
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Patent number: 5778756Abstract: A hydraulic power steering apparatus includes a fluid pump, a power cylinder, a reservoir, and a control valve connected to the pump via a supply passage including a high pressure hose and connected to the reservoir via a drain passage. The power steering apparatus also includes a bypass passage provided between the supply passage and the drain passage, and a check valve which is disposed in the bypass passage to allow operation fluid to flow only in a direction from the drain passage to the supply passage. The power steering apparatus can supply a sufficient amount of operation fluid to the power cylinder even when a steering wheel is abruptly turned or when an opposing force is input from a tire.Type: GrantFiled: March 28, 1997Date of Patent: July 14, 1998Assignee: Toyoda Koki Kabushiki KaishaInventors: Kyosuke Haga, Mikio Suzuki, Kenichi Fukumura
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Patent number: 5697145Abstract: In producing an electrochemical battery constituted by a positive electrode, a negative electrode and an electrolytic solution, an electrode material coating composition is discharged from an extrusion type liquid injector having a slot, and applied while at least one uncoated portion is being provided on a running conductive support in the running direction, so as to produce a sheet electrode plate.Type: GrantFiled: August 30, 1996Date of Patent: December 16, 1997Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenichi Fukumura, Yoshiaki Noda
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Patent number: 5674556Abstract: There is disclosed a method for producing a sheet-like electric cell plate and an electrochemical cell produced by using the plate. The sheet-like electric cell plate is produced by a method which comprises discharging an electrode material coating solution from an extrusion-type slot die and coating the solution onto an electrically-conductive support running around a backup roll. The electrochemical cell comprises a positive electrode plate, a negative electrode plate, both of which plates are produced by the above method, and an electrolyte.Type: GrantFiled: July 29, 1996Date of Patent: October 7, 1997Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenichi Fukumura, Yoshiaki Noda
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Patent number: 5577573Abstract: A hydraulic power steering system includes a pump, a flow control valve, and a bypass control valve. The flow control valve responds to a pressure drop across a metering orifice disposed in a fluid supply passage so as to control the flow rate of operating fluid by bypassing a part of the operating fluid to a reservoir. A spring chamber of the flow control valve is connected to the supply passage through a control orifice. The bypass control valve is disposed between the spring chamber and the reservoir so as to increase the amount of bypassed fluid by controlling the pressure in the spring chamber. The bypass control valve has a control spool, a load pressure introduction port connected to the upstream side of the control orifice for leading the load pressure to a first end of the control spool and a pilot port connected to the downstream side of the control orifice for leading the pressure in the spring chamber of the flow control valve to a second end of the control spool.Type: GrantFiled: December 16, 1994Date of Patent: November 26, 1996Assignee: Toyoda Koki Kabushiki KaishaInventors: Kyosuke Haga, Mikio Suzuki, Yoshiharu Inaguma, Kenichi Fukumura, Hideya Kato
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Patent number: 5515938Abstract: A power steering apparatus having a fluid source for discharging pressurized fluid, a power cylinder, a control valve responsive to operation of a steering wheel for supplying the power cylinder with pressurized fluid from the fluid source, and a reservoir. The control valve has a first control portion for controlling the flow of pressurized fluid from the fluid source to the reservoir, and a second control portion for controlling the flow of pressurized fluid to the power cylinder. The first control portion has two paths connecting the fluid source and the reservoir, each of the paths being formed with at least one variable orifice of a center-open type which opens when the control valve is in a neutral state.Type: GrantFiled: October 21, 1993Date of Patent: May 14, 1996Assignee: Toyoda Koki Kabushiki KaishaInventors: Kyosuke Haga, Mikio Suzuki, Yoshiharu Inaguma, Kenichi Fukumura, Hideya Kato, Katsuhisa Mori
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Patent number: 5474145Abstract: A hydraulic power steering system includes a pump, a flow control valve, and a bypass control valve. The flow control valve responds to a pressure drop across a metering orifice disposed in a fluid supply passage so as to control the flow rate of operational fluid by bypassing part of the operational fluid to a reservoir. A spring chamber of the flow control valve is connected to the supply passage through a control orifice. The bypass control valve is disposed between the spring chamber and the reservoir so as to increase the amount of bypassed fluid by controlling the pressure in the spring chamber. The bypass control valve has a control spool, a load pressure introduction port connected to the upstream side of the control orifice for leading the load pressure to a first end of the control spool and a pilot port connected to the downstream side of the control orifice for leading the pressure in the spring chamber of the flow control valve to a second end of the control spool.Type: GrantFiled: September 13, 1994Date of Patent: December 12, 1995Assignees: Toyoda Koki Kabushiki Kaisha, Toyota Jidosha Kabushiki KaishaInventors: Kyosuke Haga, Miko Suzuki, Kenichi Fukumura, Hideya Kato, Seiho Kawakami, Kaname Saito
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Patent number: 5471838Abstract: A power steering apparatus for a motor vehicle is provided with a metering orifice arranged on a supply passage and a flow control device in parallel relation with the metering orifice. The flow control valve includes a spool and a spring and moves the spool against the force of the spring in response to the pressure difference across the metering orifice for returning an excess part of operating fluid discharged from an engine-driven pump to an intake side of the pump so as to keep the flow rate towards a power assist gear unit almost constant regardless of changes in rotational speed of the pump. A drooping device cooperating with the flow control valve is provided comprising a control orifice at the upstream of the metering orifice and a bypass valve in communication with a spring chamber of the flow control valve retaining the spring.Type: GrantFiled: March 29, 1994Date of Patent: December 5, 1995Assignee: Toyoda Koki Kabushiki KaishaInventors: Mikio Suzuki, Kenichi Fukumura, Hideya Kato
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Patent number: 5439070Abstract: A power steering apparatus having a hydraulic pump for outputting a pressurized fluid, an assist force generation mechanism hydraulically connected to the pump through a supply passage to generate an assist force in response to rotation of a steering wheel, wherein the assist force generation mechanism has a characteristic that the back pressure thereof increases when the steering wheel is rotated. The power steering apparatus further comprises a flow control valve having a spool which is moved in response to a pressure drop at a metering orifice disposed in the middle of the supply passage, so as to control the flow rate of the pressurized fluid to be constant.Type: GrantFiled: June 11, 1993Date of Patent: August 8, 1995Assignee: Toyoda Koki Kabushiki KaishaInventors: Kyosuke Haga, Mikio Suzuki, Yoshiharu Inaguma, Kenichi Fukumura, Hideya Kato, Katsuhisa Mori