Patents by Inventor Keizo Akutagawa
Keizo Akutagawa 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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Publication number: 20230088378Abstract: A wireless power transfer system 1 includes a power transmission device 2 and a power reception device 3. The power transmission device 2 is a power transmission device 2 installed in a road 4, is provided with a power transmission coil 21 that transmits power wirelessly, and is configured such that when installed in the road 4, the normal line of a coil plane of the power transmission coil 21 is inclined with respect to the normal line of the road surface of the road 4 in a lateral cross section of the road 4. The power reception device 3 is provided with a power reception coil 31 that receives power wirelessly, and at least a portion of the power reception coil 31 is housed in the wheel 6 of the moving body 5.Type: ApplicationFiled: September 10, 2020Publication date: March 23, 2023Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.Inventors: Hiroshi FUJIMOTO, Osamu SHIMIZU, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
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Publication number: 20230090157Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 has a convex shape pointing downward in a side view as seen from an axial direction of the wheel 3.Type: ApplicationFiled: September 10, 2020Publication date: March 23, 2023Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.Inventors: Hiroshi FUJIMOTO, Osamu SHIMIZU, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
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Publication number: 20230086747Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 includes a stacked plurality of spiral coil layers 52a and 52b.Type: ApplicationFiled: September 10, 2020Publication date: March 23, 2023Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.Inventors: Hiroshi FUJIMOTO, Osamu SHIMIZU, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
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Publication number: 20220416580Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and a driving device 61 which is installed in the wheel 3 and which drives the wheel 3 with power received by the power reception device 5, wherein the power reception device 5 is provided with a converter 56a and an inverter 56b, at least a portion of the converter 56a and at least a portion of the inverter 56b are housed in the wheel 3, the converter 56a is positioned vertically above the power reception coil 51, and the inverter 56b is positioned vertically above the converter 56a.Type: ApplicationFiled: September 10, 2020Publication date: December 29, 2022Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.Inventors: Hiroshi FUJIMOTO, Osamu SHIMIZU, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
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Publication number: 20220266702Abstract: A wireless power receiving system includes: a power receiving device having a power receiving coil configured to receive electric power supplied wirelessly from a power transmission coil of a power transmission device installed on a road surface, at least part of the power receiving coil being contained in a vehicle wheel; and in-vehicle devices installed in a mobile object, the in-vehicle devices being energizably connected to the power receiving device. The power receiving device transmits the received electric power to the in-vehicle devices.Type: ApplicationFiled: July 22, 2020Publication date: August 25, 2022Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.Inventors: Hiroshi FUJIMOTO, Takehiro IMURA, Osamu SHIMIZU, Katsuhiro HATA, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
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Patent number: 9405869Abstract: An elastic response performance prediction method that employs a finite element analysis method to predict an elastic response performance expressing deformation behavior of a rubber product. The elastic response performance of the rubber product is predicted by employing a constitutive equation that expresses temperature and strain dependence of strain energy in the rubber product expressed using a parameter representing intermolecular interaction.Type: GrantFiled: October 4, 2011Date of Patent: August 2, 2016Assignee: BRIDGESTONE CORPORATIONInventor: Keizo Akutagawa
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Patent number: 9002687Abstract: The present invention relates to a method for predicting a deformation behavior of a rubber material capable of accurately analyzing a deformation behavior of a rubber material even in a micro level, and more specifically, to a method for predicting a deformation behavior of a rubber material, including: generating a three-dimensional model of the rubber material formed by adding a filler to a rubber; applying a configuration condition specifying a relationship between a stress and a strain on the basis of thickness information and temperature information obtained on the basis of a molecular dynamics approach to a rubber layer portion constituting the three-dimensional model; and, analyzing the deformation behavior of the rubber material.Type: GrantFiled: February 2, 2010Date of Patent: April 7, 2015Assignee: Bridgestone CorporationInventors: Satoshi Hamatani, Keizo Akutagawa, Hiroshi Shima
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Publication number: 20130226522Abstract: An elastic response performance prediction method that employs a finite element analysis method to predict an elastic response performance expressing deformation behavior of a rubber product. The elastic response performance of the rubber product is predicted by employing a constitutive equation that expresses temperature and strain dependence of strain energy in the rubber product, and that incorporates a number of links between cross-linked points in a statistical molecule chain, which is expressed using a parameter representing extension crystallization.Type: ApplicationFiled: October 4, 2011Publication date: August 29, 2013Applicant: BRIDGESTONE CORPORATIONInventor: Keizo Akutagawa
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Publication number: 20130211802Abstract: An elastic response performance prediction method that employs a finite element analysis method to predict an elastic response performance expressing deformation behavior of a rubber product. The elastic response performance of the rubber product is predicted by employing a constitutive equation that expresses temperature and strain dependence of strain energy in the rubber product expressed using a parameter representing intermolecular interaction.Type: ApplicationFiled: October 4, 2011Publication date: August 15, 2013Applicant: BRIDGESTONE CORPORATIONInventor: Keizo Akutagawa
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Publication number: 20110288838Abstract: The present invention relates to a method for predicting a deformation behavior of a rubber material capable of accurately analyzing a deformation behavior of a rubber material even in a micro level, and more specifically, to a method for predicting a deformation behavior of a rubber material, including: generating a three-dimensional model of the rubber material formed by adding a filler to a rubber; applying a configuration condition specifying a relationship between a stress and a strain on the basis of thickness information and temperature information obtained on the basis of a molecular dynamics approach to a rubber layer portion constituting the three-dimensional model; and, analyzing the deformation behavior of the rubber material.Type: ApplicationFiled: February 2, 2010Publication date: November 24, 2011Applicant: BRIDGESTONE CORPORATIONInventors: Satoshi Hamatani, Keizo Akutagawa, Hiroshi Shima
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Patent number: 7423393Abstract: A car control apparatus including a wheel sensor, wheel torque calculating means for calculating wheel torque from the wheel speed, drive force detecting means for detecting drive force generated by an electric motor, car body drive force calculating means for calculating car body drive force from the above drive force and wheel torque, car body drive force fluctuating component extracting means for extracting multiple frequency band fluctuating components of the car body drive force, and drive or braking force control unit for controlling the running state of a car.Type: GrantFiled: May 6, 2003Date of Patent: September 9, 2008Assignee: Kabushiki Kaisha BridgestoneInventors: Yasumichi Wakao, Keizo Akutagawa
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Patent number: 7364196Abstract: When feedback control is carried out to ensure that the drive torque of an electric motor for driving each wheel of a vehicle should be equal to a motor torque instruction value, micro-vibration is applied to each tire by superposing a micro-vibration signal to a drive signal for the above electric motor to change the slip ratio-friction characteristics themselves of the tire to control friction force between the tire and the surface of a road, thereby controlling the running performance of the vehicle.Type: GrantFiled: June 27, 2001Date of Patent: April 29, 2008Assignee: Kabushiki Kaisha BridgestoneInventors: Keizo Akutagawa, Hiroki Sawada
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Publication number: 20050274560Abstract: A car control apparatus comprising a wheel sensor 13, wheel torque calculating means 23 for calculating wheel torque from the wheel speed, drive force detecting means 12 for detecting drive force generated by an electric motor 3, car body drive force calculating means 24 for calculating car body drive force from the above drive force and wheel torque, car body drive force fluctuating component extracting means 25 for extracting multiple frequency band fluctuating components of the car body drive force, and drive or braking force control unit 22 for controlling the running state of a car, wherein drive or braking force to be applied to each wheel is obtained from main drive force, slip ratio control drive force and tire disturbance compensation drive force calculated based on the extracted fluctuating components of the car body drive force and supplied to a motor controller 11 to drive or brake the drive wheel 2 and apply micro-vibration to the tire in order to suppress micro-vibration generated between the tType: ApplicationFiled: May 6, 2003Publication date: December 15, 2005Inventors: Yasumichi Wakao, Keizo Akutagawa
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Publication number: 20020167156Abstract: When feedback control is carried out to ensure that the drive torque of an electric motor for driving each wheel of a vehicle should be equal to a motor torque instruction value, micro-vibration is applied to each tire by superposing a micro-vibration signal to a drive signal for the above electric motor to change the slip ratio-friction characteristics themselves of the tire to control friction force between the tire and the surface of a road, thereby controlling the running performance of the vehicle.Type: ApplicationFiled: February 27, 2002Publication date: November 14, 2002Inventors: Keizo Akutagawa, Hiroki Sawada
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Patent number: 6140407Abstract: This invention relates to a pneumatic tire coated with a water-based electrically conductive coating, in which the coating contains a carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of 70 m.sup.2 /g-180 m.sup.2 /g and a dibutyl phtalate (DBP) absorption of 70 ml/100 g-180 ml/100 g, a surface active agent and a rubber ingredient.Type: GrantFiled: December 16, 1998Date of Patent: October 31, 2000Assignee: Bridgestone CorporationInventors: Keizo Akutagawa, Yasuhiro Naito, Ken Yamaguchi
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Patent number: 5531256Abstract: In a flame-retardant rubber tire comprising an outer rubber body portion consisting essentially of a tread rubber layer, a sidewall rubber layer extending inward from each side edge of the tread rubber layer toward the vicinity of a bead portion in radial direction and a rubber chafer layer arranged in the vicinity of the bead portion, a flame-retardant rubber composition having an oxygen index of not less than 19.8 but not more than 27.5 is disposed so as to amount at least 20% by weight of the tread rubber layer. Such rubber tires are used in electric vehicles, automobiles, airplanes and the like and have excellent self-extinguishing property and flame-delaying property without damaging other rubber properties.Type: GrantFiled: April 21, 1994Date of Patent: July 2, 1996Assignee: Bridgestone CorporationInventors: Takatsugu Hashimoto, Keizo Akutagawa, Kazuo Yagawa, Makoto Tanaka, Junichi Yamagishi, Kazuo Hachiya
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Patent number: 5341862Abstract: In a flame-retardant rubber tire comprising an outer rubber body portion consisting essentially of a tread rubber layer, a sidewall rubber layer extending inward from each side edge of the tread rubber layer toward the vicinity of a bead portion in radial direction and a rubber chafer layer arranged in the vicinity of the bead portion, a flame-retardant rubber composition having an oxygen index of not less than 19.8 but not more than 27.5 is disposed so as to amount at least 20% by weight of the tread rubber layer. Such rubber tires are used in electric vehicles, automobiles, airplanes and the like and have excellent self-extinguishing property and flame-delaying property without damaging other rubber properties.Type: GrantFiled: November 12, 1992Date of Patent: August 30, 1994Assignee: Bridgestone CorporationInventors: Takatsugu Hashimoto, Keizo Akutagawa, Kazuo Yagawa, Makoto Tanaka, Junichi Yamagishi, Kazuo Hachiya