Patents by Inventor Daisuke Tokozakura

Daisuke Tokozakura 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: 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: 20170175612
    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: Application
    Filed: December 21, 2016
    Publication date: June 22, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20170144532
    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: Application
    Filed: November 21, 2016
    Publication date: May 25, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHllNA
  • Publication number: 20170037954
    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: Application
    Filed: June 29, 2016
    Publication date: February 9, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiro SHIINA, Daisuke TOKOZAKURA, Kazuya ARAKAWA
  • Publication number: 20170030255
    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: Application
    Filed: July 26, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya Arakawa, Takahiro Shiina
  • Publication number: 20170030254
    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: Application
    Filed: July 25, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20170030253
    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: Application
    Filed: July 22, 2016
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke TOKOZAKURA, Kazuya ARAKAWA, Takahiro SHIINA
  • Publication number: 20160245392
    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: Application
    Filed: February 18, 2016
    Publication date: August 25, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keisuke ICHIGE, Masanori IRITANI, Hitoshi TAKAYAMA, Takahiro SHllNA, Daisuke TOKOZAKURA, Satoshi TOMINAGA, Kazuya ARAKAWA
  • Publication number: 20160223274
    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: Application
    Filed: December 27, 2015
    Publication date: August 4, 2016
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Satoshi TOMINAGA, Daisuke TOKOZAKURA, Takahiro SHllNA, Kazuya ARAKAWA, Hitoshi TAKAYAMA, Keisuke ICHIGE, Masanori IRITANI
  • Patent number: 9371888
    Abstract: A pair of toothed wheels that mesh with each other includes a plateau portion. The surface of the plateau portion is a plateau-structure surface formed on each tooth face of each of the pair of the toothed wheels, with peak portions of convexities, out of a plurality of concavities and the convexities provided on the each tooth face, being flat. A reduced valley depth Rvk of the plateau portion of one of the pair of the toothed wheels as defined in JISB0671-2 is greater than the reduced valley depth Rvk of the plateau portion of the other of the pair of the toothed wheels. The area occupied by the concavities in the plateau portion of the one of the toothed wheels is larger than the area occupied by the concavities in the plateau portion of the other toothed wheel.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: June 21, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisuke Tokozakura, Akira Murakami, Yuya Takahashi, Keisuke Ichige, Masanori Iritani, Hideyuki Suzuki
  • Publication number: 20150280534
    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: Application
    Filed: October 29, 2013
    Publication date: October 1, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuya Arakawa, Yuya Takahashi, Daisuke Tokozakura
  • Publication number: 20150192195
    Abstract: Provided are gears in which flanks of mutually meshing teeth are polished and finished to a predetermined surface texture. In the gears, the arithmetic mean roughness Ra of the tooth flanks is equal to or less than 0.15 ?m and the peak height Rpk satisfies 0.01 ?m<Rpk<0.1 ?m after the finishing and before use.
    Type: Application
    Filed: November 5, 2013
    Publication date: July 9, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Okamoto, Naoki Moriguchi, Morihiro Matsumoto, Masayuki Ishibashi, Daisuke Tokozakura
  • Publication number: 20150028719
    Abstract: In a slip ring system (20) that includes: a slip ring (21) that is provided on a first rotating shaft (12) rotating about an axis (Ax); and a brush (22) that is provided in a case (11) and is pressed against the slip ring (21) and that transfers electricity between the slip ring (21) and the brush (22), a housing room (29) that is provided in the case (11) and houses the slip ring (21) and the brush (22) is provided, and a fluorinated liquid (FL) is filled in the housing room (29).
    Type: Application
    Filed: February 27, 2013
    Publication date: January 29, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Kazuya Arakawa, Yuya Takahashi, Keisuke Ichige
  • Publication number: 20140326092
    Abstract: A pair of toothed wheels that mesh with each other includes a plateau portion. The surface of the plateau portion is a plateau-structure surface formed on each tooth face of each of the pair of the toothed wheels, with peak portions of convexities, out of a plurality of concavities and the convexities provided on the each tooth face, being flat. A reduced valley depth Rvk of the plateau portion of one of the pair of the toothed wheels as defined in JISB0671-2 is greater than the reduced valley depth Rvk of the plateau portion of the other of the pair of the toothed wheels. The area occupied by the concavities in the plateau portion of the one of the toothed wheels is larger than the area occupied by the concavities in the plateau portion of the other toothed wheel.
    Type: Application
    Filed: October 5, 2012
    Publication date: November 6, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tokozakura, Akira Murakami, Yuya Takahashi, Keisuke Ichige, Masanori Iritani, Hideyuki Suzuki
  • Patent number: 8701835
    Abstract: This lubricating device 1 is equipped with an oil pan 2 that stores therein lubricating oil, a micro bubble generator 4 that mixes the lubricating oil with air to produce micro bubbles and supplies the lubricating oil in the oil pan 2 with the micro bubbles, and an oil pump 3 that pressurizes the lubricating oil in the oil pan 2 to supply the micro bubble generator 4 therewith. Further, in this lubricating device 1, the micro bubble generator 4 has an air inlet portion 431 disposed inside the oil pan 2 at a predetermined position with respect to an oil surface height (oil level) of the lubricating oil in the oil pan 2.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: April 22, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Murakami, Shuji Moriyama, Daisuke Tomomatsu, Daisuke Tokozakura, Masafumi Yamamoto, Keisuke Ichige, Masanori Iritani, Hiroyuki Nishizawa, Hideyuki Suzuki, Yasusi Hirano
  • Publication number: 20120024392
    Abstract: This lubricating device 1 is equipped with an oil pan 2 that stores therein lubricating oil, a micro bubble generator 4 that mixes the lubricating oil with air to produce micro bubbles and supplies the lubricating oil in the oil pan 2 with the micro bubbles, and an oil pump 3 that pressurizes the lubricating oil in the oil pan 2 to supply the micro bubble generator 4 therewith. Further, in this lubricating device 1, the micro bubble generator 4 has an air inlet portion 431 disposed inside the oil pan 2 at a predetermined position with respect to an oil surface height (oil level) of the lubricating oil in the oil pan 2.
    Type: Application
    Filed: March 5, 2010
    Publication date: February 2, 2012
    Inventors: Akira Murakami, Shuji Moriyama, Daisuke Tomomatsu, Daisuke Tokozakura, Masafumi Yamamoto, Keisuke Ichige, Masanori Iritani, Hiroyuki Nishizawa, Hideyuki Suzuki, Yasusi Hirano