Patents by Inventor Takuya Obata

Takuya Obata 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).

  • Patent number: 8959908
    Abstract: Provided is a brake controller which can be made smaller. The brake controller (100) has a hydraulic control mechanism (150), which comprises a master cylinder (250) which generates a hydraulic fluid pressure on the basis of an input piston (182) and a control piston (190) that move when a braking operation is performed, motors (290, 296), and a moving mechanism (200) which moves the aforementioned control piston as the aforementioned motors turn, and a motor control unit (300) for regulating the turning of the aforementioned motors.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: February 24, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kenji Kikuchi, Daisuke Yasukawa, Hirofumi Watanabe, Takuya Obata, Takayuki Ohno
  • Patent number: 8875508
    Abstract: An object of the present invention is to provide an electric booster enabling an easy connection of an ECU and a stator. An ECU casing containing boards and (ECU) is attached to the outer surface of the casing body so as to be located near a stator of an electric motor. The opening of the casing body is closed by a rear cover. A flat-portion through-hole (through-hole) is formed through the casing body. Bus bars connecting the stator and the ECU are disposed through the flat-portion through-hole. The bus bars are disposed such that one ends thereof are coupled with the stator while the other ends thereof protrude from the flat-portion through-hole. When the electric booster is assembled, since the stator and the bus bars are disposed at the casing body having the flat-portion through-hole, it is possible to easily assemble the casing body and the rear cover with the bus bars inserted through the flat-portion through-hole.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: November 4, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Shoichi Tsuchiya, Hideaki Ishii, Takuya Obata, Yukio Ohtani
  • Patent number: 8555634
    Abstract: An electric booster in which a rotation of an electric motor is converted into linear motion and transmitted to an output member by a rotation-linear motion mechanism. The output member pushes a piston of a master cylinder to generate brake fluid pressure in a pressure chamber in the master cylinder. An ECU casing containing boards is coupled to the top of a motor casing constituting the electric motor. The ECU casing is offset in one direction in a plane perpendicular to a plane containing an axis of the master cylinder. A male connector is provided at a side surface of the ECU casing on the opposite side from the offset direction side, and a space between the male connector and an interference area of the ECU casing is utilized as a space for attachment/detachment of the male connector.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: October 15, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Takayuki Ohno, Takuya Obata, Daisuke Yasukawa, Hirohumi Watanabe
  • Patent number: 8506020
    Abstract: A brake control system that enables accurate brake control is provided that precisely detects a master-cylinder pressure and includes a back-up function. The brake control system includes a master-cylinder operated by a brake operation of a driver; a first mechanism that regulates a pressure inside the master-cylinder according to the brake operation amount; a first control apparatus that controls operation of the first mechanism; a second mechanism that regulates communication of the pressure inside the master-cylinder to a wheel-cylinder; and a second control apparatus that controls operation of the second mechanism and operation of a pump apparatus that increases a pressure communicated to the wheel-cylinder. The first and second control apparatuses each have a power supply circuit and CPU.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: August 13, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Takuya Obata, Takayuki Ohno
  • Patent number: 8408660
    Abstract: A disc brake apparatus including a disc brake having a parking brake mechanism operated by an electric motor as a drive source to mechanically hold a piston in a braking position even after the hydraulic pressure is released; and a controller for supplying a predetermined amount of hydraulic pressure from a hydraulic control unit to caliper caliper, based on a parking-brake indicating signal from a parking brake switch and for operating the parking brake mechanism. In a case in which a brake pedal is being operated when a parking-brake indicating signal is input, the parking brake mechanism is operated in a state in which a hydraulic pressure in the caliper is at a predetermined pressure, after the operation of the brake pedal is finished, so as to reduce a hydraulic pressure required for a release of a brake pedal.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: April 2, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Hirotaka Oikawa, Takuya Obata
  • Patent number: 8387381
    Abstract: The present invention relates to an electric booster in which a rotation of an electric motor is converted into a linear motion and transmitted to an output member by a rotation-linear motion mechanism, and the output member pushes a piston of a master cylinder to generate a brake fluid pressure in a pressure chamber in the master cylinder. The present invention is characterized in that an ECU casing containing boards and the like such as a board for controlling the electric motor is coupled to the top of a motor casing constituting the electric motor. The ECU casing is offset in one direction in a plane perpendicular to a plane containing an axis of the master cylinder. A male connector is provided at a side surface of the ECU casing on the opposite side from the offset direction F side, and a space between the male connector and an interference area of the ECU casing with the other components and devices is utilized as a space for attachment/detachment of the male connector to/from the female connector.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Takayuki Ohno, Takuya Obata, Daisuke Yasukawa, Hirofumi Watanabe
  • Patent number: 8240922
    Abstract: A wheel support bearing assembly, which enables an increase in the strength and the fatigue strength of its wheel mounting flange or vehicle body fitting flange against high stress and repeated stress and the suppression of the increase of the number of processes, includes an inner member and an outer member rotatable relative to each other through rolling elements. The flange is formed on the inner member or the outer member. A component part having the flange is a hot-forged product of steel in which a matrix portion is formed as a standard structure and the non-standard structural portion is formed on the surface of the flange. The non-standard structure is formed of either of a fine ferrite/pearlite structure, an upper bainite structure, a lower bainite structure, and a tempered martensite structure, or mixture of two or more of these structures.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: August 14, 2012
    Assignee: NTN Corporation
    Inventors: Isao Hirai, Kohei Yoshino, Takayasu Takubo, Akira Fujimura, Takuya Obata
  • Publication number: 20110259005
    Abstract: Provided is a brake controller which can be made smaller. The brake controller (100) has a hydraulic control mechanism (150), which comprises a master cylinder (250) which generates a hydraulic fluid pressure on the basis of an input piston (182) and a control piston (190) that move when a braking operation is performed, motors (290, 296), and a moving mechanism (200) which moves the aforementioned control piston as the aforementioned motors turn, and a motor control unit (300) for regulating the turning of the aforementioned motors.
    Type: Application
    Filed: November 30, 2009
    Publication date: October 27, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kenji Kikuchi, Daisuke Yasukawa, HIrofumi Watanabe, Takuya Obata, Takayuki Ohno
  • Patent number: 8011184
    Abstract: An electric booster which drives an electric motor (40) in response to a movement of an input member (9) moving together with a brake pedal (B), and generates a brake hydraulic pressure in a master cylinder (10) through a ball screw mechanism (50). The electric motor (40) includes a stator (41) having a coil therein, a rotor (42) which rotates by applying current to the stator (41), and an annular motor casing (2) containing the stator (41) and the rotor (42). The ball screw mechanism (50) is fittedly disposed in the rotor (42). An opening (3b) on one axial end side of the motor casing (2) has a larger diameter than an outer diameter of the ball screw mechanism (50). In manufacturing, after the electric motor (40) alone is tested, the ball screw mechanism (50) is inserted through the opening (3b) and installed without the need of disassembling the motor casing (2).
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: September 6, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Ohtani, Takuya Obata, Takayuki Ohno, Naoki Shirakawa
  • Publication number: 20110203268
    Abstract: An object of the present invention is to provide an electric booster enabling an easy connection of an ECU and a stator. An ECU casing containing boards and (ECU) is attached to the outer surface of the casing body so as to be located near a stator of an electric motor. The opening of the casing body is closed by a rear cover. A flat-portion through-hole (through-hole) is formed through the casing body. Bus bars connecting the stator and the ECU are disposed through the flat-portion through-hole. The bus bars are disposed such that one ends thereof are coupled with the stator while the other ends thereof protrude from the flat-portion through-hole. When the electric booster is assembled, since the stator and the bus bars are disposed at the casing body having the flat-portion through-hole, it is possible to easily assemble the casing body and the rear cover with the bus bars inserted through the flat-portion through-hole.
    Type: Application
    Filed: March 23, 2011
    Publication date: August 25, 2011
    Inventors: Shoichi Tsuchiya, Hideaki Ishii, Takuya Obata, Yukio Ohtani
  • Publication number: 20110025119
    Abstract: A brake control system that enables accurate brake control is provided that precisely detects a master-cylinder pressure and includes a back-up function. The brake control system includes a master-cylinder operated by a brake operation of a driver; a first mechanism that regulates a pressure inside the master-cylinder according to the brake operation amount; a first control apparatus that controls operation of the first mechanism; a second mechanism that regulates communication of the pressure inside the master-cylinder to a wheel-cylinder; and a second control apparatus that controls operation of the second mechanism and operation of a pump apparatus that increases a pressure communicated to the wheel-cylinder. The first and second control apparatuses each have a power supply circuit and CPU.
    Type: Application
    Filed: February 18, 2010
    Publication date: February 3, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio NISHINO, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Takuya Obata, Takayuki Ohno
  • Patent number: 7861522
    Abstract: The present invention relates to an electrically driven brake booster in which boost control is performed as follows; when an input piston is displaced forward by an input rod upon an operation of a brake pedal, an electric motor is operated according to the input, and a primary piston is displaced forward by a ball-screw mechanism, and then a primary and secondary pressure chamber in a master cylinder main body are pressurized. A first seal and a second seal are disposed at a seal portion between the primary piston and the input piston. A portion between the first seal and the second seal is in communication with an outside through a discharge passage. Brake fluid which leaks from the first seal is sealed off by the second seal, and is discharged to the outside through the discharge passage, whereby it becomes possible to prevent that the electric motor and the ball-screw mechanism otherwise might be corroded by the leaking brake fluid.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: January 4, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takuya Obata, Toshio Takayama, Takayuki Ohno, Yukio Ohtani
  • Patent number: 7753178
    Abstract: A disk brake with a parking brake mechanism capable of exerting a large piston thrust required for operating a parking brake, without adversely affecting operation of a service brake. A parking brake mechanism 32, which is driven by an electric motor provided outside a housing 30, is incorporated in a caliper 14 in which a piston 26 is slidably disposed in a cylinder 24. The parking brake mechanism 32 is slidably fitted via a seal member 36 into the piston 26 and provided with a nut member 37 that is prevented from rotating relative to the piston 26 by engagement of a pin 48 and a pin hole 49; and a shaft 35 that is screwed into the nut member 37. During a service brake operation, the piston 26 alone is moved by a hydraulic pressure under a small piston thrust.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: July 13, 2010
    Assignee: Hitachi, Ltd
    Inventors: Yukio Ohtani, Yasuo Karasudani, Takuya Obata
  • Publication number: 20090217659
    Abstract: The present invention relates to an electric booster in which a rotation of an electric motor is converted into a linear motion and transmitted to an output member by a rotation-linear motion mechanism, and the output member pushes a piston of a master cylinder to generate a brake fluid pressure in a pressure chamber in the master cylinder. The present invention is characterized in that an ECU casing containing boards and the like such as a board for controlling the electric motor is coupled to the top of a motor casing constituting the electric motor. The ECU casing is offset in one direction in a plane perpendicular to a plane containing an axis of the master cylinder. A male connector is provided at a side surface of the ECU casing on the opposite side from the offset direction F side, and a space between the male connector and an interference area of the ECU casing with the other components and devices is utilized as a space for attachment/detachment of the male connector to/from the female connector.
    Type: Application
    Filed: January 28, 2009
    Publication date: September 3, 2009
    Inventors: Takayuki Ohno, Takuya Obata, Daisuke Yasukawa, Hirofumi Watanabe
  • Publication number: 20090189436
    Abstract: A wheel support bearing assembly, which enables an increase in the strength and the fatigue strength of its wheel mounting flange or vehicle body fitting flange against high stress and repeated stress and the suppression of the increase of the number of processes, includes an inner member and an outer member rotatable relative to each other through rolling elements. The flange is formed on the inner member or the outer member, for example, a hub. A component part having the flange is a hot-forged product of steel in which a matrix portion is formed as a standard structure and the non-standard structural portion is formed on the surface of the flange. The non-standard structure is formed of either of a fine ferrite/pearlite structure, an upper bainite structure, a lower bainite structure, and a tempered martensite structure, or mixture of two or more of these structures.
    Type: Application
    Filed: July 10, 2006
    Publication date: July 30, 2009
    Applicant: NTN CORPORATION
    Inventors: Isao Hirai, Kohei Yoshino, Takayasu Takubo, Akira Fujimura, Takuya Obata
  • Publication number: 20080302100
    Abstract: An object of the present invention is to provide an electric booster and a manufacturing method thereof in which it becomes possible to conduct a test of an electric motor alone without disassembling a motor casing, thereby facilitating the manufacturing process and reducing manufacturing cost. In an electric booster which drives an electric motor 40 in response to a movement of an input member 9 moving together with a brake pedal B, and generates a brake hydraulic pressure in a master cylinder 10 through a ball screw mechanism 50, the electric motor 40 comprises a stator 41 including a coil therein, a rotor 42 which rotates by applying current to the stator 41, and an annular motor casing 2 containing the stator 41 and the rotor 42. The ball screw mechanism 50 is fittedly disposed in the rotor 42. An opening 3b on one axial end side of the motor casing 2 has a larger diameter than an outer diameter of the ball screw mechanism 50.
    Type: Application
    Filed: June 3, 2008
    Publication date: December 11, 2008
    Inventors: Yukio Ohtani, Takuya Obata, Takayuki Ohno, Naoki Shirakawa
  • Publication number: 20080295512
    Abstract: The present invention relates to an electrically driven brake booster in which boost control is performed as follows; when an input piston is displaced forward by an input rod upon an operation of a brake pedal, an electric motor is operated according to the input, and a primary piston is displaced forward by a ball-screw mechanism, and then a primary and secondary pressure chamber in a master cylinder main body are pressurized. A first seal and a second seal are disposed at a seal portion between the primary piston and the input piston. A portion between the first seal and the second seal is in communication with an outside through a discharge passage. Brake fluid which leaks from the first seal is sealed off by the second seal, and is discharged to the outside through the discharge passage, whereby it becomes possible to prevent that the electric motor and the ball-screw mechanism otherwise might be corroded by the leaking brake fluid.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Inventors: Takuya Obata, Toshio Takayama, Takayuki Ohno, Yukio Ohtani
  • Publication number: 20080231109
    Abstract: An object of the present invention is to provide a brake apparatus in which a hydraulic pressure in a master cylinder is prevented from being increasingly varied while an anti-lock brake system is in operation, and therefore a pedal feeling can be improved. The brake apparatus comprises an electric booster including an input member which moves forward or backward in response to an operation of a brake pedal, an assist member which moves forward or backward by being driven by an electric actuator using an electric motor as its driving source. The electric booster generates a boosted brake hydraulic pressure in the master cylinder under an input thrust provided to the input member through the brake pedal and an assist thrust provided to the assist member by the electric actuator.
    Type: Application
    Filed: February 21, 2008
    Publication date: September 25, 2008
    Inventors: Yukihiko Yamada, Tohma Yamaguchi, Takuya Obata, Hirotaka Oikawa
  • Publication number: 20080053760
    Abstract: The disc brake apparatus includes a disc brake having a parking brake mechanism operated by an electric motor as a drive source to mechanically hold a piston, which has been moved forward by a hydraulic pressure supplied from a hydraulic control unit into a caliper, in a braking position even after the hydraulic pressure is released; and a controller for supplying a predetermined amount of hydraulic pressure from the hydraulic control unit to the caliper, based on a parking-brake indicating signal from a parking brake switch and for operating the parking brake mechanism, wherein, in a case in which a brake pedal is being operated when a parking-brake indicating signal is input, the parking brake mechanism is operated in a state in which a hydraulic pressure in the caliper is at a predetermined pressure, after the operation of the brake pedal is finished, so as to reduce a hydraulic pressure required for a release of a brake pedal.
    Type: Application
    Filed: August 28, 2007
    Publication date: March 6, 2008
    Inventors: Hirotaka Oikawa, Takuya Obata
  • Publication number: 20070158148
    Abstract: A disk brake with a parking brake mechanism capable of exerting a large piston thrust required for operating a parking brake, without adversely affecting operation of a service brake. A parking brake mechanism 32, which is driven by an electric motor provided outside a housing 30, is incorporated in a caliper 14 in which a piston 26 is slidably disposed in a cylinder 24. The parking brake mechanism 32 is slidably fitted via a seal member 36 into the piston 26 and provided with a nut member 37 that is prevented from rotating relative to the piston 26 by engagement of a pin 48 and a pin hole 49; and a shaft 35 that is screwed into the nut member 37. During a service brake operation, the piston 26 alone is moved by a hydraulic pressure under a small piston thrust.
    Type: Application
    Filed: November 28, 2006
    Publication date: July 12, 2007
    Inventors: Yukio Ohtani, Yasuo Karasudani, Takuya Obata