Patents by Inventor Kazuya Arakawa

Kazuya Arakawa 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: 20210016420
    Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.
    Type: Application
    Filed: September 22, 2020
    Publication date: January 21, 2021
    Inventors: Ryunosuke KUMAGAI, Akira TOMONAGA, Kazuya ARAKAWA
  • Patent number: 10821577
    Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: November 3, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Akira Tomonaga, Kazuya Arakawa
  • Patent number: 10663037
    Abstract: A helical gear device includes: first and second helical gear respectively and rotatably disposed about first and third mutually parallel axes; a second helical gear meshing with the first and third helical gears so that a rotary motion is transmitted from the first to the third helical gear through the second, the second helical gear having a center bore; a support shaft disposed coaxially with a second axis parallel to the first, and extending through the center bore with a predetermined amount of radial play between the support shaft and the second helical gear, rotatably supporting the second helical gear. The second and third helical gears have a predetermined radial clearance in their reference meshing state in which their pitch circles contact. The radial clearance is smaller than a radial gap of a backlash between the second and third helical gears in the reference meshing state.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: May 26, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi Yorita, Taketsugu Sasaki, Kenichiro Tsukamoto, Kazuya Arakawa, Manabu Hashimoto
  • Patent number: 10443703
    Abstract: A lubrication control device for a transmission includes an oil pump, a heat exchanger, an oil quantity control valve, a first bypass oil passage, and an electronic control unit. The heat exchanger is connected between the oil pump and a lubricated portion of the transmission. The oil quantity control valve includes an inflow port, a supply port, and a discharge port. The supply port is connected to the heat exchanger. The oil quantity control valve is configured to control a supply oil quantity as a flow rate of the oil flowing from the inflow port to the supply port and discharge a residue of the oil from the discharge port. The first bypass oil passage is connected to the discharge port. The electronic control unit is configured to adjust the oil quantity control valve such that the supply oil quantity increases as a temperature of the oil increases.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: October 15, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina, Satoshi Tominaga
  • Patent number: 10442285
    Abstract: A cooling apparatus for a hybrid vehicle is provided with an oil circulating circuit supplying oil discharged from an electric oil pump to a first motor, a second motor, an inverter, and a lubrication-required part, and the oil circulating circuit includes: a first circuit supplying the oil that is discharged from the electric oil pump, and is cooled by an HV radiator to the inverter, the first motor, and the second motor; and a second circuit supplying the oil that is discharged from the electric oil pump without being cooled by the HV radiator to the lubrication-required part.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: October 15, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Patent number: 10418867
    Abstract: A switched reluctance motor include: a stator; a case in which the stator is accommodated; a rotor disposed inward of the stator in the radial direction of the switched reluctance motor; and a holding member fixed to the case. The holding member is configured to hold the stator with the stator spaced apart from an inner peripheral surface of the case. The holding member includes a holding portion and a fixed portion. The holding portion is configured to hold the stator from the outside in the radial direction. The holding portion is spaced apart from the inner peripheral surface of the case. The fixed portion is fixed to the case.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: September 17, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kensuke Yoshizue, Kazuya Arakawa, Junichi Deguchi, Masahide Uemura
  • Patent number: 10287964
    Abstract: An cooling system including an oil circulation circuit includes a first circuit including an electric oil pump that discharges oil as a coolant to be supplied to an inverter and respective motors, and an HV radiator that cools the oil to be supplied to the inverter and the respective motors, and a second circuit including a mechanical oil pump that discharges the oil to be supplied to a lubrication-required part without passing through the HV radiator.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 14, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Patent number: 10234016
    Abstract: A heat exchanging device includes: a heat exchanger configured to perform heat exchange between first operating oil used in an engine and second operating oil used in a fluid transmitting device and an automatic transmission; and a heat exchanging amount decreasing unit configured to, when a temperature of the second operating oil is lower than a predetermined temperature at which it is allowed to engage a lock-up mechanism, decrease a flow amount of at least one of the first and second operating oil flowing in the heat exchanger as compared to a case in which the temperature of the second operating oil is not lower than the predetermined temperature.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: March 19, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiro Shiina, Daisuke Tokozakura, Kazuya Arakawa
  • Patent number: 10184733
    Abstract: A heat exchanger includes: a first flow passage where first liquid flows; a second flow passage where second liquid flows; and a heat exchanger main body configured to exchange heat between the first liquid and the second liquid. The heat exchanger main body includes a cross-sectional area adjuster configured to change a flow passage cross-sectional area of at least one of the first flow passage and the second flow passage by thermal deformation. The cross-sectional area adjuster adjusts a value of the flow passage cross-sectional area in a low temperature range to be larger than a value of the flow passage cross-sectional area in a high temperature range.
    Type: Grant
    Filed: December 27, 2015
    Date of Patent: January 22, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Satoshi Tominaga, Daisuke Tokozakura, Takahiro Shiina, Kazuya Arakawa, Hitoshi Takayama, Keisuke Ichige, Masanori Iritani
  • Publication number: 20180347668
    Abstract: A helical gear device includes: first and second helical gear respectively and rotatably disposed about first and third mutually parallel axes; a second helical gear meshing with the first and third helical gears so that a rotary motion is transmitted from the first to the third helical gear through the second, the second helical gear having a center bore; a support shaft disposed coaxially with a second axis parallel to the first, and extending through the center bore with a predetermined amount of radial play between the support shaft and the second helical gear, rotatably supporting the second helical gear. The second and third helical gears have a predetermined radial clearance in their reference meshing state in which their pitch circles contact. The radial clearance is smaller than a radial gap of a backlash between the second and third helical gears in the reference meshing state.
    Type: Application
    Filed: June 4, 2018
    Publication date: December 6, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi YORITA, Taketsugu SASAKI, Kenichiro TSUKAMOTO, Kazuya ARAKAWA, Manabu HASHIMOTO
  • Patent number: 10107382
    Abstract: A vehicular drive system includes an engine having a first oil, a transmission having a second oil, and a heat exchanger 4 that exchanges heat between the first oil and the second oil. The magnitude of the amount of reduction of loss torque in the transmission per unit amount of reduction of the kinetic viscosity of the second oil is larger than the magnitude of the amount of increase of loss torque in the engine per unit amount increase of the kinetic viscosity of the first oil.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: October 23, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Publication number: 20180222022
    Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.
    Type: Application
    Filed: January 26, 2018
    Publication date: August 9, 2018
    Inventors: Ryunosuke KUMAGAI, Akira TOMONAGA, Kazuya ARAKAWA
  • Patent number: 10018102
    Abstract: A heat exchanger includes a plurality of plates that is stacked together to constitute first flow passages, second flow passage, third flow passage, fourth flow passage and fifth flow passage. An engine coolant flows through the first flow passages. An engine oil flows through the second flow passages and fourth flow passages. A transmission oil flows through the third flow passages and fifth flow passages. Triple-flow-passage arrangement layers in each of which each first, second, and third flow passages are disposed, and dual-flow-passage arrangement layers in each of which each fourth and fifth flow passages are disposed are alternately arranged such that flow passages of each same type are not overlaid with one another in a stacking direction of the plates.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: July 10, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Patent number: 10001210
    Abstract: A lubrication structure includes a liquid drop splashing device and an electret portion. The liquid drop splashing device is configured to turn a lubricating liquid for lubricating machine-element components into liquid drops. The liquid drop splashing device is configured to splash the lubricating liquid turned into the liquid drops. The machine-element components configure contact parts. Each contact part is a part where corresponding adjacent machine-element components come into contact with each other. An electret portion is provided to a vicinity of each contact part. The electret portion is composed of an electret.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: June 19, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keisuke Ichige, Masanori Iritani, Hitoshi Takayama, Takahiro Shiina, Daisuke Tokozakura, Satoshi Tominaga, Kazuya Arakawa
  • Patent number: 9957879
    Abstract: A heat exchanger includes: a first flow passage for an engine coolant; a second flow passage for an engine oil; a third flow passage for a transmission oil; and plural plates that partition the first, the second and the third flow passage. The first flow passage is configured to allow the engine coolant to be heat-exchanged with both the engine oil and the transmission oil via the plates. The second flow passage is arranged in the same layer with the third flow passage. The first flow passage is arranged in a different layer from the layer of the second and the third flow passage. The third flow passage is disposed on an upstream side and second flow passage is disposed on a downstream side in a flow direction of the engine coolant in the first flow passage.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: May 1, 2018
    Assignee: TOYOTA JIDOSHI KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Patent number: 9856778
    Abstract: A heat exchanger includes first, second, third, and fourth passages. Engine coolant flows through the first passages. Engine oil flows through the second passages. Transmission oil flows through the fourth passages after flows through the third passages. Each first passage and each third passage is disposed in the same layer. Each second passage and each fourth passage is disposed in the same layer. Each first and each third passage are disposed in a different layer from the layer of each second and each fourths flow passage. Each fourth passage is disposed upstream of a first flow direction of the engine coolant in each first passage, and each second passage is disposed downstream of the first flow direction. Each third passage is disposed upstream of a second flow direction of the engine oil in each second passage, and each first passage is disposed downstream of the second flow direction.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: January 2, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
  • Publication number: 20170241538
    Abstract: A lubrication control device for a transmission includes an oil pump, a heat exchanger, an oil quantity control valve, a first bypass oil passage, and an electronic control unit. The heat exchanger is connected between the oil pump and a lubricated portion of the transmission. The oil quantity control valve includes an inflow port, a supply port, and a discharge port. The supply port is connected to the heat exchanger. The oil quantity control valve is configured to control a supply oil quantity as a flow rate of the oil flowing from the inflow port to the supply port and discharge a residue of the oil from the discharge port. The first bypass oil passage is connected to the discharge port. The electronic control unit is configured to adjust the oil quantity control valve such that the supply oil quantity increases as a temperature of the oil increases.
    Type: Application
    Filed: August 20, 2015
    Publication date: August 24, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA, Satoshi TOMINAGA
  • Patent number: 9712023
    Abstract: A slip ring device (5) includes ring members (10a-10c) that rotate along with an input shaft, and brushes that contact the ring members (10a-10c). The ring members (10a-10c) have surfaces (11a-11c) that contact the brushes, and a plurality of dimples are formed upon these surfaces (11a-11c).
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: July 18, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuya Arakawa, Yuya Takahashi, Daisuke Tokozakura
  • Publication number: 20170198803
    Abstract: A vehicular drive system includes an engine having a first oil, a transmission having a second oil, and a heat exchanger 4 that exchanges heat between the first oil and the second oil. The magnitude of the amount of reduction of loss torque in the transmission per unit amount of reduction of the kinetic viscosity of the second oil is larger than the magnitude of the amount of increase of loss torque in the engine per unit amount increase of the kinetic viscosity of the first oil.
    Type: Application
    Filed: June 23, 2015
    Publication date: July 13, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHINA
  • Publication number: 20170187315
    Abstract: A control device for a switched reluctance motor includes: a switching controller configured to execute switching control to switch drive control of the switched reluctance motor between a first control mode for reducing torque fluctuations and a second control mode for reducing fluctuations of a radial force based on rotational speed and a torque of the switched reluctance motor; a first controller configured to execute first control to cause an excitation current with a current waveform for reducing the torque fluctuations to flow through the coils; and a second controller configured to execute second control to cause an excitation current with a current waveform for reducing the radial force fluctuations to flow through the coils.
    Type: Application
    Filed: December 20, 2016
    Publication date: June 29, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Jun-ichi DEGUCHI, Kazuya ARAKAWA, Kensuke YOSHIZUE, Nobukazu HOSHI, Keiichi SHIBUYA, Yusuke KOBAYASHI