Patents by Inventor Dai Arai

Dai Arai 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: 20220154822
    Abstract: A motorcycle includes a transmission, a first measuring unit, a second measuring unit, and a controller. The transmission is configured to automatically shift gears between a driving shaft and a driven shaft to transmit power from the driving shaft to the driven shaft. The first measuring unit is configured to measure the magnitude of a roll angle of a vehicle body. The second measuring unit is configured to measure the angular velocity of the roll angle of the vehicle body. The controller is configured to inhibit the transmission from shifting gears, based on the magnitude and the angular velocity of the roll angle. This configuration provides a motorcycle that enables gear shift control with more detailed response to a situation of a vehicle body.
    Type: Application
    Filed: May 11, 2020
    Publication date: May 19, 2022
    Applicant: Honda Motor Co., Ltd.
    Inventors: Dai ARAI, Shinji MISAWA, Yukio YOKOGAWA, Asuka ITO
  • Patent number: 11320046
    Abstract: A power transmission apparatus includes a shift drum, a clutch, a clutch lifter, and a transmission body. The shift drum makes a dowel be extracted/inserted between a shifter and a shift gear. The clutch has first friction plates and second friction plates. The first friction plates rotate around a main shaft by receiving power from a crankshaft. The second friction plates are disposed alternately with the first friction plates and are relatively non-rotatably supported by the main shaft. The clutch lifter is displaced between a connection position at which power is transmitted by the clutch and a disconnection position at which the transmission of the power is disconnected. The transmission body transmits a driving force to the shift drum while the clutch lifter moves from the connection position to the disconnection position, in accordance with rotation of a shift spindle that rotates in accordance with a driving force.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: May 3, 2022
    Assignee: Honda Motor Co., Ltd.
    Inventors: Dai Arai, Toshimasa Mitsubori, Hayato Yoshida, Yohei Endo
  • Patent number: 11268577
    Abstract: In a vehicle cam damper structure, a drive shaft includes a cam damper at a midway portion thereof. The cam damper integrates a cam reception portion with a cam via a shaft member. The cam reception portion is connected relatively rotatably with the shaft member. The cam and the shaft member, while being integrally rotatable, are connected with each other axially slidably. The shaft member includes an enlarged-diameter portion. An elastic member that presses the cam toward a side of the cam reception portion is disposed between the enlarged-diameter portion and the cam. An outer cylinder extends across the cam reception portion and the shaft member. A drive-side shaft and a driven-side shaft of the drive shaft are each connected with corresponding one of the cam reception portion and the shaft member.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: March 8, 2022
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Koji Sato, Akio Handa, Keita Yagi, Dai Arai, Eiichi Suzuki, Takeyuki Kariyasu
  • Publication number: 20200378496
    Abstract: A power transmission apparatus includes a shift drum, a clutch, a clutch lifter, and a transmission body. The shift drum makes a dowel be extracted/inserted between a shifter and a shift gear. The clutch has first friction plates and second friction plates. The first friction plates rotate around a main shaft by receiving power from a crankshaft. The second friction plates are disposed alternately with the first friction plates and are relatively non-rotatably supported by the main shaft. The clutch lifter is displaced between a connection position at which power is transmitted by the clutch and a disconnection position at which the transmission of the power is disconnected. The transmission body transmits a driving force to the shift drum while the clutch lifter moves from the connection position to the disconnection position, in accordance with rotation of a shift spindle that rotates in accordance with a driving force.
    Type: Application
    Filed: May 6, 2020
    Publication date: December 3, 2020
    Inventors: Dai ARAI, Toshimasa MITSUBORI, Hayato YOSHIDA, Yohei ENDO
  • Patent number: 10718386
    Abstract: A basic pulse time setting section determines a basic pulse time for initial invalid stroke elimination by applying current values of oil temperature and throttle opening to the basic pulse time map. A subtraction time setting section determines a subtraction time by applying current values of oil temperature and clutch oil pressure to the subtraction time map. A pulse time determining section determines a predetermined initial invalid stroke elimination pulse time by subtracting the subtraction time from the basic pulse time. An initial invalid stroke elimination permission/inhibition determination section, at a starting timing of initial invalid stroke elimination, inhibits this-time initial invalid stroke elimination if the elapsed time from the execution timing of the preceding initial invalid stroke elimination is within the predetermined inhibition period.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: July 21, 2020
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Naoki Sakamoto, Shinya Nishiyama, Dai Arai
  • Patent number: 10655732
    Abstract: A gear position detecting device includes a rotation angle sensor for detecting a turn position of a shift drum and a position sensor for detecting that the shift drum is at a neutral position. The rotation angle sensor is a volume sensor that linearly increases or decreases an output voltage according to a turning motion of the shift drum. The neutral position is set in such a way as not to overlap a dead zone. It is determined according to an output signal of the rotation angle sensor and an output signal of the position sensor whether the shift drum is at a reverse gear position located between the neutral position and the dead zone or a fifth gear position turned by 360 degrees from the reverse gear position. Such detecting device detects a gear position with a high accuracy even if the number of gear positions are increased.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: May 19, 2020
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yasuhiro Nozaki, Masaki Yamazaki, Naoki Kobayashi, Hayato Yoshida, Naoki Sakamoto, Dai Arai
  • Publication number: 20200102988
    Abstract: In a vehicle cam damper structure, a drive shaft includes a cam damper at a midway portion thereof. The cam damper integrates a cam reception portion with a cam via a shaft member. The cam reception portion is connected relatively rotatably with the shaft member. The cam and the shaft member, while being integrally rotatable, are connected with each other axially slidably. The shaft member includes an enlarged-diameter portion. An elastic member that presses the cam toward a side of the cam reception portion is disposed between the enlarged-diameter portion and the cam. An outer cylinder extends across the cam reception portion and the shaft member. A drive-side shaft and a driven-side shaft of the drive shaft are each connected with corresponding one of the cam reception portion and the shaft member.
    Type: Application
    Filed: September 19, 2019
    Publication date: April 2, 2020
    Inventors: Koji Sato, Akio Handa, Keita Yagi, Dai Arai, Eiichi Suzuki, Takeyuki Kariyasu
  • Patent number: 10562393
    Abstract: A basic clutch capacity calculating unit calculates a clutch capacity of the DCT applying an engine speed, a degree of throttle opening, and a front wheel vehicle speed to a map. The basic clutch capacity calculating unit further calculates the DCT basic clutch capacity by amending the basic clutch capacity based on an oil temperature and a water temperature. An NE converted value calculating unit calculates an NE converted value obtained by converting a vehicle speed into an engine speed with the front wheel vehicle speed and a DCT speed change stage as input parameters. A hunting detecting unit detects hunting by comparing the engine speed with the NE converted value when a throttle operation is detected. A DCT clutch capacity correcting unit makes decreasing correction of a DCT clutch capacity when hunting is detected for suppressing the hunting.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: February 18, 2020
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Naoki Sakamoto, Shinya Nishiyama, Dai Arai
  • Publication number: 20190093766
    Abstract: A gear position detecting device includes a rotation angle sensor for detecting a turn position of a shift drum and a position sensor for detecting that the shift drum is at a neutral position. The rotation angle sensor is a volume sensor that linearly increases or decreases an output voltage according to a turning motion of the shift drum. The neutral position is set in such a way as not to overlap a dead zone. It is determined according to an output signal of the rotation angle sensor and an output signal of the position sensor whether the shift drum is at a reverse gear position located between the neutral position and the dead zone or a fifth gear position turned by 360 degrees from the reverse gear position. Such detecting device detects a gear position with a high accuracy even if the number of gear positions are increased.
    Type: Application
    Filed: September 26, 2018
    Publication date: March 28, 2019
    Inventors: Yasuhiro NOZAKI, Masaki YAMAZAKI, Naoki KOBAYASHI, Hayato YOSHIDA, Naoki SAKAMOTO, Dai ARAI
  • Patent number: 10202919
    Abstract: An engine output control device controls engine output at a time of a downshift speed change of a transmission. The engine output control device includes: engine speed detecting means for detecting an actual engine speed NeJ of a crankshaft; and engine output adjusting means capable of adjusting the engine output according to an operation of a rider. The smaller of a requested engine output PA calculated on a basis of the actual engine speed NeJ and a rider requested engine output PB adjusted by the engine output adjusting means is output as the engine output.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: February 12, 2019
    Assignee: Honda Motor Co., Ltd.
    Inventors: Dai Arai, Junya Niwa, Masataka Tanaka
  • Patent number: 10150481
    Abstract: In a rough terrain vehicle, at a time of preparing to start movement, in a case that a left paddle switch and a right paddle switch are operated together with an accelerator pedal, an ECU disengages a clutch of an automatic transmission, and causes an output of an engine to increase. On the other hand, at a time of starting movement, in a case that the left paddle switch and the right paddle switch are returned to their initial positions, the ECU engages the clutch and transmits the output of the engine from the engine to vehicle wheels via the automatic transmission, to thereby rapidly start movement of the rough terrain vehicle.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: December 11, 2018
    Assignee: HONDA MOTOR CO., LTD
    Inventors: Naoki Sakamoto, Yasuhiro Nozaki, Naoki Kobayashi, Dai Arai, Takao Kochi
  • Publication number: 20180299789
    Abstract: An exposure apparatus includes a projection system, a stage having a holder on which a substrate is held, a supply system having a supply flow path via which liquid is supplied to form an immersion area under the projection system, a first recovery system having a recovery port via which the supplied liquid is recovered from above the stage, a second recovery system having a recovery flow path provided in the stage via which the supplied liquid is recovered, and a third recovery system which has a path and which removes liquid in the supply flow path using the path. The substrate is exposed via the liquid immersion area covering a portion of an upper surface of the substrate with exposure light from the projection system.
    Type: Application
    Filed: June 20, 2018
    Publication date: October 18, 2018
    Applicant: NIKON CORPORATION
    Inventors: Hideaki HARA, Hiroaki TAKAIWA, Dai ARAI
  • Publication number: 20180281590
    Abstract: A basic clutch capacity calculating unit calculates a clutch capacity of the DCT applying an engine speed, a degree of throttle opening, and a front wheel vehicle speed to a map. The basic clutch capacity calculating unit further calculates the DCT basic clutch capacity by amending the basic clutch capacity based on an oil temperature and a water temperature. An NE converted value calculating unit calculates an NE converted value obtained by converting a vehicle speed into an engine speed with the front wheel vehicle speed and a DCT speed change stage as input parameters. A hunting detecting unit detects hunting by comparing the engine speed with the NE converted value when a throttle operation is detected. A DCT clutch capacity correcting unit makes decreasing correction of a DCT clutch capacity when hunting is detected for suppressing the hunting.
    Type: Application
    Filed: March 9, 2018
    Publication date: October 4, 2018
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Naoki SAKAMOTO, Shinya NISHIYAMA, Dai ARAI
  • Publication number: 20180283478
    Abstract: A basic pulse time setting section determines a basic pulse time for initial invalid stroke elimination by applying current values of oil temperature and throttle opening to the basic pulse time map. A subtraction time setting section determines a subtraction time by applying current values of oil temperature and clutch oil pressure to the subtraction time map. A pulse time determining section determines a predetermined initial invalid stroke elimination pulse time by subtracting the subtraction time from the basic pulse time. An initial invalid stroke elimination permission/inhibition determination section, at a starting timing of initial invalid stroke elimination, inhibits this-time initial invalid stroke elimination if the elapsed time from the execution timing of the preceding initial invalid stroke elimination is within the predetermined inhibition period.
    Type: Application
    Filed: March 13, 2018
    Publication date: October 4, 2018
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Naoki SAKAMOTO, Shinya NISHIYAMA, Dai ARAI
  • Patent number: 10047805
    Abstract: A clutch hydraulic pressure control circuit includes: a shift valve for switching the destination to feed hydraulic pressure to a first hydraulic clutch or a second hydraulic clutch; and first and second shift solenoid valves operating synchronously to actuate the shift valve. The two shift solenoid valves include a holding valve for keeping hydraulic pressure fed to the shift valve even when hydraulic pressure supply through one of the first and second shift solenoid valves happens to be shut off while hydraulic pressure is fed through the first and second shift solenoid valves to paths between the shift valve and the shift solenoid valves, or when hydraulic pressure supply through one of the first and second shift solenoid valves happens to occur while no hydraulic pressure is fed through the shift solenoid valves.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: August 14, 2018
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Toshimasa Mitsubori, Dai Arai, Yasushi Fujimoto
  • Patent number: 10024384
    Abstract: A powertrain structure includes a drive shaft and a driven shaft disposed coaxially, with end surfaces opposed to each other, and a torque damper interposed between the shafts and having half bodies fitted to a shaft end parts of the drive and driven shafts, with the half bodies joined together by engagement of opposed, outer circumferential end surfaces thereof and a damper spring interposed therebetween such that it straddles drive-side and driven-side spring recesses respectively formed in the opposed surfaces of the half bodies. One of two fitting parts provided between the half bodies and the respective shafts has a smaller clearance and the other has an larger clearance in the radial direction of the shafts.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: July 17, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Toshimasa Mitsubori, Shinya Nishiyama, Naoki Kobayashi, Dai Arai
  • Patent number: 10012909
    Abstract: A liquid immersion exposure apparatus includes a projection system having a last optical element, a liquid supply system having a first path through which immersion liquid is supplied to a supply opening, and a liquid removal system having a second path connected to the first path. The liquid removal system removes the immersion liquid from the first path using the second path so that the supply flow path becomes a substantially gas filled space.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: July 3, 2018
    Assignee: NIKON CORPORATION
    Inventors: Hideaki Hara, Hiroaki Takaiwa, Dai Arai
  • Publication number: 20180011410
    Abstract: An exposure apparatus exposes a substrate with an illumination light via a projection optical system. The apparatus has a base member supported via a first isolating member below the projection optical system; a stage arranged on the base member, and having a holder configured to support the substrate; a metrology frame supported via a second isolating member; a drive system to drive the stage on the base member; a plurality of grating portions on the metrology frame and arranged substantially parallel to a predetermined plane orthogonal to an optical axis of the projection optical system above the stage; an encoder system on the stage and configured to obtain position information of the stage; and a controller configured to control the drive system based on the position information obtained by the encoder system.
    Type: Application
    Filed: September 20, 2017
    Publication date: January 11, 2018
    Applicant: NIKON CORPORATION
    Inventor: Dai ARAI
  • Publication number: 20180003117
    Abstract: An engine output control device controls engine output at a time of a downshift speed change of a transmission. The engine output control device includes: engine speed detecting means for detecting an actual engine speed NeJ of a crankshaft; and engine output adjusting means capable of adjusting the engine output according to an operation of a rider. The smaller of a requested engine output PA calculated on a basis of the actual engine speed NeJ and a rider requested engine output PB adjusted by the engine output adjusting means is output as the engine output.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 4, 2018
    Inventors: Dai ARAI, Junya NIWA, Masataka TANAKA
  • Patent number: 9804506
    Abstract: An exposure apparatus can mitigate the impact of fluctuations in the refractive index of ambient gas, and improve, for example, stage positioning accuracy. An exposure apparatus radiates an exposure illumination light to a wafer on a wafer stage through a projection optical system, and forms a prescribed pattern on the wafer, and comprises: a scale, which is provided to the wafer stage; a plurality of X heads, which detect information related to the position of the scale; a measurement frame that integrally supports the plurality of X heads and has a coefficient of linear thermal expansion that is smaller than that of the main body of the wafer stage (portions excepting a plate wherein the scale is formed); and a control apparatus that derives information related to the displacement of the wafer stage based on the detection results of the plurality of X heads.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: October 31, 2017
    Assignee: NIKON CORPORATION
    Inventor: Dai Arai