Patents by Inventor Naoya Yokomachi

Naoya Yokomachi 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: 11053929
    Abstract: Provided is a variable displacement pump which sucks and discharges a working fluid by moving a piston with a stroke in response to an inclination angle of a swash plate, the variable displacement pump including: a control piston which includes a columnar piston portion pressing the swash plate and adjusts the inclination angle of the swash plate between a maximal inclination angle in which a discharge capacity of the working fluid becomes maximal and a minimal inclination angle in which the discharge capacity of the working fluid becomes minimal; a piston accommodation portion which is formed in the housing and accommodates the piston portion; and a pressed portion which is disposed between the swash plate and the piston portion and is pressed toward the swash plate by the piston portion, in which when the inclination angle of the swash plate is an intermediate inclination angle in which the discharge capacity of the working fluid becomes an intermediate amount between the maximal amount and the minimal amou
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: July 6, 2021
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu Matsuo, Naoya Yokomachi, Yuki Ueda, Takashi Uno
  • Publication number: 20200283061
    Abstract: A hydraulic drive device for an industrial vehicle includes a variable displacement pump, a displacement control valve, a power steering cylinder, a power steering valve, a loading cylinder, a loading valve, a hydraulic oil passage, and a pilot line. The displacement control valve controls the variable displacement pump to increase displacement of the variable displacement pump when differential pressure between discharge pressure of hydraulic oil discharged from the variable displacement pump and pilot pressure generated in the pilot line is smaller than a predetermined set pressure. A spool of the loading valve is provided with a groove portion that forms a communication passage that makes communication between the hydraulic oil passage and the pilot line at a neutral position of the loading valve when the power steering valve is located in a neutral position.
    Type: Application
    Filed: October 5, 2018
    Publication date: September 10, 2020
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Takashi UNO, Naoya YOKOMACHI, Yuki UEDA, Tsutomu MATSUO
  • Patent number: 10487811
    Abstract: A variable displacement swash plate type piston pump includes first and second housing members fastened to each other by fastening members, a rotary shaft, a swash plate. A section of the inner circumferential surface of the first housing member has a recess. A bulging portion is arranged in a section of the outer circumferential wall of the first housing member. A section of the outer circumferential wall of the second housing member has a closing portion that closes the opening of the recess. The fastening members include first and second fastening members arranged at positions that are on the opposite sides of the recess, inside the width of the swash plate in a direction along the inclination axis of the swash plate, and closer to the rotary shaft than the distal ends of the bulging portion and the closing portion in the bulging direction.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: November 26, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu Matsuo, Naoya Yokomachi, Yuki Ueda, Takashi Uno
  • Patent number: 10465667
    Abstract: Provided is a variable displacement pump which includes a cylinder block including a plurality of cylinder bores formed in a rotation shaft in a circumferential direction and rotating together with the rotation shaft, a piston provided inside each of the plurality of cylinder bores to be slidable, and a swash plate supported to be tiltable with respect to the rotation shaft while a distal end portion of the piston is slidable thereon and which sucks and discharges a working fluid by moving the piston in a reciprocating manner with a stroke in accordance with an inclination angle of the swash plate, the variable displacement pump including: a control piston which includes a piston portion pressing the swash plate and controls the inclination angle of the swash plate; a piston accommodation portion which is formed in the housing and accommodates the piston portion; and a hollow cylindrical guide portion which is disposed between the piston accommodation portion and the piston portion and includes an inner perip
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: November 5, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu Matsuo, Naoya Yokomachi, Yuki Ueda, Takashi Uno
  • Patent number: 10358329
    Abstract: A hydraulic control device of a forklift truck includes a first hydraulic cylinder, a first instructing member, a second hydraulic cylinder, a second instructing member, a hydraulic pump, an electric motor, a first oil passage, a lowering control valve, a second oil passage that is branched from the first oil passage at a junction, a flow control valve, a first pilot passage through which pressure in the first oil passage at a position between the first hydraulic cylinder and the lowering control valve is applied to a first accommodating chamber of the flow control valve as the pressure upstream of the lowering control valve, and a second pilot passage through which pressure in the first oil passage at a position between the lowering control valve and the hydraulic pump is applied to a second accommodating chamber of the flow control valve as the pressure downstream of the lowering control valve.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: July 23, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki Ueda, Naoya Yokomachi, Tsutomu Matsuo, Takashi Uno
  • Patent number: 10215226
    Abstract: A hydraulic pump having a rotary shaft rotatably supported with respect to a casing, the hydraulic pump including: a bearing part provided to one end side and the other end side of the rotary shaft; and a first annular member provided around the rotary shaft on at least one side of the one end side and the other end side of the rotary shaft. The bearing part on the one side has a support part which rotatably supports the rotary shaft, and a preload applying member which applies a preload in the axial direction to the support part. The first annular member is interposed between the bearing part of the one side and a receiving part of the rotary shaft in the axial direction, and an inner diameter of the first annular member is larger than a diameter of the rotary shaft.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: February 26, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu Matsuo, Naoya Yokomachi, Yuki Ueda, Takashi Uno
  • Publication number: 20190032645
    Abstract: A variable displacement swash plate type piston pump includes first and second housing members fastened to each other by fastening members, a rotary shaft, a swash plate. A section of the inner circumferential surface of the first housing member has a recess. A bulging portion is arranged in a section of the outer circumferential wall of the first housing member. A section of the outer circumferential wall of the second housing member has a closing portion that closes the opening of the recess. The fastening members include first and second fastening members arranged at positions that are on the opposite sides of the recess, inside the width of the swash plate in a direction along the inclination axis of the swash plate, and closer to the rotary shaft than the distal ends of the bulging portion and the closing portion in the bulging direction.
    Type: Application
    Filed: December 19, 2016
    Publication date: January 31, 2019
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu MATSUO, Naoya YOKOMACHI, Yuki UEDA, Takashi UNO
  • Publication number: 20190003494
    Abstract: In a hydraulic driving device for a cargo handling vehicle, a power running torque limit value setting unit sets a power running torque limit value to a minimum rotation speed set in advance, in a case where a determination unit determines that operations of second hydraulic cylinders including a lowering operation of a first operating portion are simultaneously performed, a rotation speed command value setting unit sets a rotation speed command value to a maximum value from between a lowering required rotation speed based on an operation amount of the first operating portion and a second hydraulic cylinder required rotation speed based on operation amounts of the second operating portions, and the power running torque limit value setting unit sets the power running torque limit value to the second hydraulic cylinder required rotation speed based on the operation amounts of the second operating portions, and a control unit controls an electric motor to rotate at a rotation speed based on the rotation speed co
    Type: Application
    Filed: August 18, 2016
    Publication date: January 3, 2019
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Naoya YOKOMACHI, Tsutomu MATSUO, Takashi UNO, Tetsuya GOTO, Takanori KANNA
  • Publication number: 20180328350
    Abstract: Provided is a variable displacement pump which sucks and discharges a working fluid by moving a piston with a stroke in response to an inclination angle of a swash plate, the variable displacement pump including: a control piston which includes a columnar piston portion pressing the swash plate and adjusts the inclination angle of the swash plate between a maximal inclination angle in which a discharge capacity of the working fluid becomes maximal and a minimal inclination angle in which the discharge capacity of the working fluid becomes minimal; a piston accommodation portion which is formed in the housing and accommodates the piston portion; and a pressed portion which is disposed between the swash plate and the piston portion and is pressed toward the swash plate by the piston portion, in which when the inclination angle of the swash plate is an intermediate inclination angle in which the discharge capacity of the working fluid becomes an intermediate amount between the maximal amount and the minimal amou
    Type: Application
    Filed: September 23, 2016
    Publication date: November 15, 2018
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu MATSUO, Naoya YOKOMACHI, Yuki UEDA, Takashi UNO
  • Publication number: 20180306171
    Abstract: Provided is a variable displacement pump which includes a cylinder block including a plurality of cylinder bores formed in a rotation shaft in a circumferential direction and rotating together with the rotation shaft, a piston provided inside each of the plurality of cylinder bores to be slidable, and a swash plate supported to be tiltable with respect to the rotation shaft while a distal end portion of the piston is slidable thereon and which sucks and discharges a working fluid by moving the piston in a reciprocating manner with a stroke in accordance with an inclination angle of the swash plate, the variable displacement pump including: a control piston which includes a piston portion pressing the swash plate and controls the inclination angle of the swash plate; a piston accommodation portion which is formed in the housing and accommodates the piston portion; and a hollow cylindrical guide portion which is disposed between the piston accommodation portion and the piston portion and includes an inner perip
    Type: Application
    Filed: September 23, 2016
    Publication date: October 25, 2018
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu MATSUO, Naoya YOKOMACHI, Yuki UEDA, Takashi UNO
  • Patent number: 10106386
    Abstract: A hydraulic control device of a forklift truck includes a first hydraulic cylinder, a first instruction member, a second hydraulic cylinder, a second instruction member, a hydraulic pump, an electric motor, a first passage which has a drain passage, a lowering control valve that controls flow of hydraulic oil, a flow rate control valve, and a controller. When a lowering operation of forks and an operation of a hydraulically-operated unit are performed simultaneously, when a required rotation speed of the hydraulic pump that is required for operating the hydraulically-operated unit at an instruction speed based on an operation of the second instruction member is a specified rotation speed or lower, the controller controls an instruction rotation speed of the electric motor so as to operate the hydraulic pump at the required rotation speed to thereby restrict the operation of the hydraulic pump.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: October 23, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki Ueda, Naoya Yokomachi, Tsutomu Matsuo, Takashi Uno, Tetsuya Goto, Takanori Kanna
  • Publication number: 20180231055
    Abstract: A hydraulic pump having a rotary shaft rotatably supported with respect to a casing, the hydraulic pump including: a bearing part provided to one end side and the other end side of the rotary shaft; and a first annular member provided around the rotary shaft on at least one side of the one end side and the other end side of the rotary shaft. The bearing part on the one side has a support part which rotatably supports the rotary shaft, and a preload applying member which applies a preload in the axial direction to the support part. The first annular member is interposed between the bearing part of the one side and a receiving part of the rotary shaft in the axial direction, and an inner diameter of the first annular member is larger than a diameter of the rotary shaft.
    Type: Application
    Filed: July 28, 2016
    Publication date: August 16, 2018
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tsutomu MATSUO, Naoya YOKOMACHI, Yuki UEDA, Takashi UNO
  • Publication number: 20170211556
    Abstract: A variable capacity piston pump including a control piston pressing a pressed portion of a swashplate from a cylinder block side to adjust an inclination of the swashplate between a maximum inclination and a minimum inclination, and a swashplate return spring biasing the pressed portion of the swashplate toward the cylinder block side of the sliding contact surface, wherein there is a positional relationship in which a vertical reference line passes between a first seat surface center position of the swashplate return spring when the swashplate is at the maximum inclination and a second seat surface center position of the swashplate return spring when the swashplate is at the minimum inclination.
    Type: Application
    Filed: July 2, 2015
    Publication date: July 27, 2017
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Naoya YOKOMACHI, Tsutomu MATSUO, Takashi UNO
  • Publication number: 20170211555
    Abstract: A variable capacity piston pump including a piston portion of the control piston causing a pressing force to act along one direction by pressing a pressed portion of a swashplate from a cylinder block side to adjust an inclination of the swashplate between a maximum inclination and a minimum inclination, and a swashplate return spring biasing the pressed portion of the swashplate toward the cylinder block side of the sliding contact surface, wherein there is a positional relationship in which a vertical reference line passes between a first action position which is an action position of the pressing force when the inclination of the swashplate is the maximum inclination and a second action position which is an action position of the pressing force when the inclination of the swashplate is the minimum inclination.
    Type: Application
    Filed: July 2, 2015
    Publication date: July 27, 2017
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Naoya YOKOMACHI, Tsutomu MATSUO, Takashi UNO
  • Patent number: 9631613
    Abstract: A hydraulic drive device for cargo handling vehicle has: a tank; a pump for drawing in a hydraulic oil from the tank and supplying the hydraulic oil to hydraulic cylinders; an electric motor for driving the pump; a solenoid-controlled proportional valve disposed between an inlet port of the pump and a bottom chamber of an up-and-down hydraulic cylinder and configured to open with a valve travel depending upon a control input of a descent control of an up-and-down control member; a pressure compensation valve disposed between a branch portion located between the pump and the solenoid-controlled proportional valve and the tank and configured to open with a valve travel depending upon a pressure difference between pressures upstream and downstream of the solenoid-controlled proportional valve; and a valve disposed between the pressure compensation valve and the tank and configured to be switched between an open position and a close position.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: April 25, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki Ueda, Tsutomo Matsuo, Takashi Uno, Hirohiko Ishikawa, Naoya Yokomachi
  • Publication number: 20160332854
    Abstract: A hydraulic control device of a forklift truck includes a first hydraulic cylinder, a first instruction member, a second hydraulic cylinder, a second instruction member, a hydraulic pump, an electric motor, a first passage which has a drain passage, a lowering control valve that controls flow of hydraulic oil, a flow rate control valve, and a controller. When a lowering operation of forks and an operation of a hydraulically-operated unit are performed simultaneously, when a required rotation speed of the hydraulic pump that is required for operating the hydraulically-operated unit at an instruction speed based on an operation of the second instruction member is a specified rotation speed or lower, the controller controls an instruction rotation speed of the electric motor so as to operate the hydraulic pump at the required rotation speed to thereby restrict the operation of the hydraulic pump.
    Type: Application
    Filed: May 11, 2016
    Publication date: November 17, 2016
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Naoya YOKOMACHI, Tsutomu MATSUO, Takashi UNO, Tetsuya GOTO, Takanori KANNA
  • Publication number: 20160297656
    Abstract: A hydraulic control device of a forklift truck includes a first hydraulic cylinder, a first instructing member, a second hydraulic cylinder, a second instructing member, a hydraulic pump, an electric motor, a first oil passage, a lowering control valve, a second oil passage that is branched from the first oil passage at a junction, a flow control valve, a first pilot passage through which pressure in the first oil passage at a position between the first hydraulic cylinder and the lowering control valve is applied to a first accommodating chamber of the flow control valve as the pressure upstream of the lowering control valve, and a second pilot passage through which pressure in the first oil passage at a position between the lowering control valve and the hydraulic pump is applied to a second accommodating chamber of the flow control valve as the pressure downstream of the lowering control valve.
    Type: Application
    Filed: April 6, 2016
    Publication date: October 13, 2016
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Naoya YOKOMACHI, Tsutomu MATSUO, Takashi UNO
  • Publication number: 20140369866
    Abstract: A hydraulic drive device for cargo handling vehicle has: a tank; a pump for drawing in a hydraulic oil from the tank and supplying the hydraulic oil to hydraulic cylinders; an electric motor for driving the pump; a solenoid-controlled proportional valve disposed between an inlet port of the pump and a bottom chamber of an up-and-down hydraulic cylinder and configured to open with a valve travel depending upon a control input of a descent control of an up-and-down control member; a pressure compensation valve disposed between a branch portion located between the pump and the solenoid-controlled proportional valve and the tank and configured to open with a valve travel depending upon a pressure difference between pressures upstream and downstream of the solenoid-controlled proportional valve; and a valve disposed between the pressure compensation valve and the tank and configured to be switched between an open position and a close position.
    Type: Application
    Filed: June 13, 2014
    Publication date: December 18, 2014
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yuki UEDA, Tsutomo MATSUO, Takashi UNO, Hirohiko ISHIKAWA, Naoya YOKOMACHI
  • Patent number: 8707715
    Abstract: A thermoelectric conversion unit includes first and second cases including first and second recesses that define first and second flow passages and have openings, first and second substrates, a plurality of thermoelectric devices in contact with inner surfaces of the first and second substrates, a connector for joining the first and second cases, first and second fins protruding from the first and second substrates in the first and second flow passages. The first and second cases include first and second opposed portions opposed to the first and second substrates outside the first and second recess, respectively. A spacer for setting distance between the first opposed portion and the second opposed portion is provided. The spacer sets the distance between the first and second opposed portions to be longer than distance between the outer surface of the first substrate and the outer surface of the second substrate.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: April 29, 2014
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Motoaki Okuda, Naoya Yokomachi, Hiromi Ueda, Junki Nakamura
  • Publication number: 20130291921
    Abstract: A thermoelectric device includes a thermoelectric element module arranged such that the vertically upper side is the cooling side and the vertically lower side is the heating side. On the cooling side of the thermoelectric element module, a DC-DC converter, a cooler, and a heat-transfer grease layer are arranged in this order from the vertically upper side.
    Type: Application
    Filed: January 13, 2012
    Publication date: November 7, 2013
    Applicants: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaki Morita, Wataru Kadowaki, Naoya Yokomachi, Motoaki Okuda, Naoto Morisaku