Patents by Inventor Hiroaki Nakagawa

Hiroaki Nakagawa 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).

  • Publication number: 20240186847
    Abstract: A motor may include: a stator comprising a stator core and a coil; a housing that houses the stator; and a first annular member that provides a seal between a first end face of the stator core and an inner wall surface of the housing. The inner wall surface may include a first inner wall surface radially facing a first coil end of the coil and a second inner wall surface facing the first coil end. The first annular member may include: a first portion having a cylindrical shape and interposed between the first coil end and the first inner wall surface; and a second portion protruding radially inward from the first portion and interposed between the first coil end and the second inner wall surface. The first portion may include a plurality of first holes through which refrigerant is injected toward the first coil end.
    Type: Application
    Filed: December 5, 2023
    Publication date: June 6, 2024
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shogo KAJIMOTO, Hiroaki URANO, Yukio TSUCHIYA, Yutaro IKEDA, Hideki NAKAGAWA, Kentaro YOSHIOKA, Yuta NARISAWA
  • Publication number: 20240162787
    Abstract: A motor may include a rotor; a stator comprising a stator core and a coil; a housing that houses the rotor and the stator; and a first annular member that provides a seal between a first end face of the stator core in an axial direction of the stator core and an inner wall surface of the housing. The first annular member may include a plurality of first holes through which refrigerant is injected toward a first coil end of the coil protruding from the first end face of the stator core. At least one of the plurality of first holes may be covered with at least one mesh filter.
    Type: Application
    Filed: November 2, 2023
    Publication date: May 16, 2024
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shogo KAJIMOTO, Hiroaki URANO, Kentaro YOSHIOKA, Yukio TSUCHIYA, Yuta NARISAWA, Yutaro IKEDA, Hideki NAKAGAWA
  • Patent number: 11953035
    Abstract: A working machine includes a prime mover, a hydraulic pump driven by power of the prime mover, a cooler including a cooling fan rotated by either the power of the prime mover or hydraulic fluid delivered from the hydraulic pump, and a controller configured or programmed to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and to perform, after the reduction control, a restoration control for restoring the target fan rotation speed. The controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.
    Type: Grant
    Filed: July 12, 2023
    Date of Patent: April 9, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Daiki Abe, Ryota Hamamoto, Hiroaki Nakagawa
  • Patent number: 11946227
    Abstract: A working machine includes a controller configured or programmed to perform an automatic deceleration for automatically decelerating a left traveling motor and a right traveling motor rotated at a second speed by shifting from the second speed to the first speed, and to determine a deceleration threshold that is used for judging whether the automatic deceleration has to be performed or not.
    Type: Grant
    Filed: June 28, 2021
    Date of Patent: April 2, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Kohei Nagao, Yuji Fukuda, Ryota Hamamoto, Hiroaki Nakagawa
  • Publication number: 20240102263
    Abstract: A working machine includes a machine body, a working device provided on the machine body movably up and down with respect to the machine body, a protector provided on the machine body to protect an operator's seat on the machine body, a detector provided on the protector to detect an obstacle higher than the protector, and a controller configured or programmed to, when the detector detects the obstacle, perform at least one process to prevent the working device from contacting the obstacle.
    Type: Application
    Filed: September 27, 2022
    Publication date: March 28, 2024
    Inventors: Ryota HAMAMOTO, Hiroaki NAKAGAWA, Yuji FUKUDA
  • Publication number: 20240026648
    Abstract: A working machine includes a prime mover, a traveling device, a traveling motor, a traveling pump, a circulation fluid passage, a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor, a brake, an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom, and a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode. The controller is configured or programmed to, when activating the first mode, shift the brake into a braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 25, 2024
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji FUKUDA, Kohei NAGAO, Hiroaki NAKAGAWA, Ryota HAMAMOTO
  • Patent number: 11866911
    Abstract: A control method for a fan of a work vehicle includes supplying, when an engine is started, a first current to a solenoid of a variable relief valve such that the hydraulic fluid flows by a first flow rate, supplying, when a rotational speed of the engine becomes larger than a first rotational speed threshold value, a second current larger than the first current to the solenoid such that the hydraulic fluid flows by a second flow rate smaller than the first flow rate to reduce the rotational speed of the fan, and supplying, when the rotational speed of the engine becomes larger than a second rotational speed threshold value that is larger than the first rotational speed threshold value, a current to the solenoid to change the rotational speed of the fan, the current corresponding to a temperature of liquid flowing in the work vehicle.
    Type: Grant
    Filed: September 16, 2022
    Date of Patent: January 9, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Hiroaki Nakagawa, Ryota Hamamoto, Yasuhiro Nishida, Daiki Abe
  • Patent number: 11846087
    Abstract: A working machine includes a controller configured to determine a first deceleration threshold corresponding to each of a first traveling pressure, a second traveling pressure, a third traveling pressure, and a fourth traveling pressure, to perform automatic deceleration to reduce rotation speeds of a left traveling motor and a right traveling motor, and to judge whether to perform the automatic deceleration based on the determined first deceleration threshold, the first traveling pressure, the second traveling pressure, the third traveling pressure, and the fourth traveling pressure.
    Type: Grant
    Filed: July 29, 2021
    Date of Patent: December 19, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa, Jun Tomita
  • Patent number: 11814815
    Abstract: A working machine includes a prime mover, a traveling motor a speed shifting valve configured to shift an output speed of the traveling motor between a first speed and a second speed faster than the first speed, an actuation valve to change a hydraulic pressure applied to the speed shifting valve, a brake shiftable between a braking state to brake the traveling motor and a braking releasing state to release the braking, and a controller configured or programmed to control the actuation valve and the brake, and being capable of activate a warm-up mode. The controller, when activating the warm-up mode, shifts the brake into the braking state, and controls the actuation valve so as to make the hydraulic pressure applied to the speed shifting valve equal to or greater than a value corresponding to the second speed.
    Type: Grant
    Filed: August 5, 2021
    Date of Patent: November 14, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Hiroaki Nakagawa, Ryota Hamamoto, Kazuki Ueda, Yudai Koga, Kohei Kurachi
  • Publication number: 20230349402
    Abstract: A working machine includes a prime mover, a hydraulic pump driven by power of the prime mover, a cooler including a cooling fan rotated by either the power of the prime mover or hydraulic fluid delivered from the hydraulic pump, and a controller configured or programmed to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and to perform, after the reduction control, a restoration control for restoring the target fan rotation speed. The controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.
    Type: Application
    Filed: July 12, 2023
    Publication date: November 2, 2023
    Applicant: KUBOTA CORPORATION
    Inventors: Daiki ABE, Ryota HAMAMOTO, Hiroaki NAKAGAWA
  • Patent number: 11781572
    Abstract: A working machine includes a prime mover, a hydraulic pump driven by power of the prime mover, a cooler including a cooling fan rotated by either the power of the prime mover or hydraulic fluid delivered from the hydraulic pump, and a controller configured or programmed to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and to perform, after the reduction control, a restoration control for restoring the target fan rotation speed. The controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: October 10, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Daiki Abe, Yuji Fukuda, Hiroaki Nakagawa, Ryota Hamamoto
  • Publication number: 20230203789
    Abstract: A control method for a fan of a work vehicle includes supplying, when an engine is started, a first current to a solenoid of a variable relief valve such that the hydraulic fluid flows by a first flow rate, supplying, when a rotational speed of the engine becomes larger than a first rotational speed threshold value, a second current larger than the first current to the solenoid such that the hydraulic fluid flows by a second flow rate smaller than the first flow rate to reduce the rotational speed of the fan, and supplying, when the rotational speed of the engine becomes larger than a second rotational speed threshold value that is larger than the first rotational speed threshold value, a current to the solenoid to change the rotational speed of the fan, the current corresponding to a temperature of liquid flowing in the work vehicle.
    Type: Application
    Filed: September 16, 2022
    Publication date: June 29, 2023
    Applicant: Kubota Corporation
    Inventors: Yuji FUKUDA, Hiroaki NAKAGAWA, Ryota HAMAMOTO, Yasuhiro NISHIDA, Daiki ABE
  • Patent number: 11634024
    Abstract: A working machine includes a machine body having a front-rear direction and a right-left direction perpendicular to the front-rear direction and having a rear part in the front-rear direction, a right side, and a left side opposite to the right side in the right-left direction. A boom has a front end part and a rear end part opposite to the front end part of the boom in the front-rear direction. The rear end part of the boom is rotatably supported at the rear part of the machine body. The front end part of the boom is to be connected to a working tool. An engine is mounted in the rear part of the machine body. A urea aqueous solution tank is provided on one side of the engine in the right-left direction and a rear side of the engine in the front-rear direction to store a urea aqueous solution.
    Type: Grant
    Filed: February 2, 2022
    Date of Patent: April 25, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Keigo Honda, Hiroaki Nakagawa, Daisuke Sakurai, Hiroshi Fujiwara
  • Publication number: 20220291210
    Abstract: Provided is a high-accuracy analysis method utilizing an enzyme-lined immunoassay. The presence of an analyte 3 can be detected or the abundance of the analyte 3 can be analyzed by: bonding an antibody 5 that is capable of specifically bonding to the analyte 3 immobilized on a solid phase 1 and has an enzyme 7 bonded thereto; then decomposing an enzyme substrate 8, which can generate decomposition products capable of being detected easily with a mass spectrometry, with the enzyme 7 bonded to the antibody 5; and then analyzing the decomposition products 9 and 10 with a mass spectrometry.
    Type: Application
    Filed: May 31, 2022
    Publication date: September 15, 2022
    Inventor: Hiroaki NAKAGAWA
  • Patent number: 11414835
    Abstract: A working machine includes a hydraulic device, an operation valve to supply operation fluid to operate the hydraulic device and to vary the operation fluid to be supplied to the hydraulic device, an operation device having an operation member supported swingably, the operation device being configured to output an operation signal in accordance with an operation amount of the operation member, and a controller including a swing calculator to calculate an evaluation value representing a degree of swinging of the operation member, and a control signal generator to generate a control signal based on the evaluation value and the operation signal.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: August 16, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Masahiro Toyama, Ryuki Nishimoto, Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa
  • Patent number: 11371215
    Abstract: A working machine includes a first traveling fluid line through which operation fluid applied to a first pressure receiving portion when a traveling operation member is operated, a second traveling fluid line through which operation fluid applied to a second pressure receiving portion when the traveling operation member is operated, a third traveling fluid line through which operation fluid applied to a third pressure receiving portion when the traveling operation member is operated, a fourth traveling fluid line through which operation fluid applied to a fourth pressure receiving portion when the traveling operation member is operated, and a controller configured or programed to judge, first, second, third and fourth pilot pressures, whether the traveling operation member is operated in a direction corresponding to any of spin-turn, pivotal-turn and straight-traveling.
    Type: Grant
    Filed: August 9, 2021
    Date of Patent: June 28, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa, Yoshimitsu Tanaka
  • Patent number: 11353047
    Abstract: A hydraulic system for a work machine includes a tank to store an operation fluid, a hydraulic device to be operated by the operation fluid, a control valve to control the hydraulic device, a first fluid tube connecting the hydraulic device and the control valve, the first fluid tube being to supply the operation fluid from the control valve to the hydraulic device, a second fluid tube branching from the first fluid tube and connected to the tank, a switch valve provided to the second fluid tube, the switch valve being to control a flow rate of the operation fluid, and an oil cooler provided to the second fluid tube between the switch valve and the tank.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: June 7, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kazuyoshi Arii, Hiroaki Nakagawa
  • Publication number: 20220153129
    Abstract: A working machine includes a machine body having a front-rear direction and a right-left direction perpendicular to the front-rear direction and having a rear part in the front-rear direction, a right side, and a left side opposite to the right side in the right-left direction. A boom has a front end part and a rear end part opposite to the front end part of the boom in the front-rear direction. The rear end part of the boom is rotatably supported at the rear part of the machine body. The front end part of the boom is to be connected to a working tool. An engine is mounted in the rear part of the machine body. A urea aqueous solution tank is provided on one side of the engine in the right-left direction and a rear side of the engine in the front-rear direction to store a urea aqueous solution.
    Type: Application
    Filed: February 2, 2022
    Publication date: May 19, 2022
    Applicant: Kubota Corporation
    Inventors: Keigo HONDA, Hiroaki NAKAGAWA, Daisuke SAKURAI, Hiroshi FUJIWARA
  • Patent number: 11273703
    Abstract: A working machine includes a machine body having a front and a rear opposite to the front in a front-rear direction and an engine mounted in the machine body. A selective catalytic reduction catalyst is provided in the machine body and connected to the machine body and connected to the engine. A fuel tank is provided in the machine body to supply fuel to an engine. A urea aqueous solution tank is to store a urea aqueous solution. The urea aqueous solution tank is connected to the selective catalytic reduction catalyst and provided in the machine body between the engine and the front of the machine body in the front-rear direction. A traveling device support body supports the right traveling device and the left traveling device. The machine body does not rotate with respect to the traveling device support body.
    Type: Grant
    Filed: May 25, 2020
    Date of Patent: March 15, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Keigo Honda, Hiroaki Nakagawa, Daisuke Sakurai, Hiroshi Fujiwara
  • Publication number: 20220049729
    Abstract: A working machine includes a prime mover, a hydraulic pump driven by power of the prime mover, a cooler including a cooling fan rotated by either the power of the prime mover or hydraulic fluid delivered from the hydraulic pump, and a controller configured or programmed to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and to perform, after the reduction control, a restoration control for restoring the target fan rotation speed. The controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.
    Type: Application
    Filed: August 6, 2021
    Publication date: February 17, 2022
    Applicant: KUBOTA CORPORATION
    Inventors: Daiki ABE, Yuji FUKUDA, Hiroaki NAKAGAWA, Ryota HAMAMOTO