Patents by Inventor Naoki Hiramatsu

Naoki Hiramatsu 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: 20190284967
    Abstract: A variable valve mechanism includes a first member and a second member which are disposed between a cam and a valve, a switch pin that is displaced to connect and disconnect the first member to and from the second member, and a displacement device. The displacement device includes a ring-shaped plate that is fitted on a camshaft of the cam so as to be co-rotatable with the camshaft and slidable in a longitudinal direction of the camshaft and that has one side surface configured to contact the switch pin and has the other side surface including a tapered surface formed so that a plate thickness increases toward a rotational direction, and a support device formed by a support pin and a moving device that moves the support pin to a position where the support pin contacts the tapered surface and a position not contacting the tapered surface.
    Type: Application
    Filed: February 26, 2019
    Publication date: September 19, 2019
    Inventor: Naoki HIRAMATSU
  • Patent number: 10407295
    Abstract: An object is to suppress excessive insertion of a fueling nozzle during fueling. A nozzle guide configured to form a nozzle guide path that guides a fueling nozzle is placed inside of a filler neck main body configured to include a fuel passage that introduces a fuel supplied from the fueling nozzle toward a fuel tank. This nozzle guide comprises a first projection for nozzle restriction provided on a nozzle guide end opening portion at an end of the nozzle guide path along a nozzle guide direction and protruded from an end opening circumferential wall of the nozzle guide end opening portion to narrow at least part of a diameter of the nozzle guide path; and a second projection for nozzle restriction provided on a downstream side of the first projection along the nozzle guide direction and protruded from the end opening circumferential wall to narrow at least part of the diameter of the nozzle guide path.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: September 10, 2019
    Assignee: TOYODA GOSEI CO., LTD.
    Inventors: Tomohiro Kubo, Naoki Nishimoto, Yoshinari Hiramatsu
  • Patent number: 10247062
    Abstract: A variable valve mechanism includes a first cam and a second cam, a main arm that drives a valve when swinging, a first sub arm that swings when pressed by the first cam, a second sub arm that swings when pressed by the second cam, and a switch device. The switch device includes a first switch pin that moves between a first coupled position between the main arm and the first sub arm and a first uncoupled position, and a second switch pin that moves between a second coupled position between the main arm and the second sub arm and a second uncoupled position. Both switch pins are arranged so as to be displaced from each other in positions where these switch pins do not overlap at least during a base circle phase in which base circles of both cams act.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: April 2, 2019
    Assignee: OTICS CORPORATION
    Inventors: Masatoshi Sugiura, Naoki Hiramatsu
  • Patent number: 10233790
    Abstract: A variable valve mechanism of an internal combustion engine includes a cam, a transmission mechanism, a first variable device that controls the transmission mechanism to continuously change at least a maximum lift amount of a lift curve indicating a lift amount of a valve that corresponds to a rotation angle of the internal combustion engine, and a second variable device that controls the transmission mechanism to continuously change at least an operation angle of the lift curve. When the lift curve lies in any condition within a predetermined range that covers all or part of a variable range of the lift curve, an absolute value of a ratio of a maximum lift amount variation to an operation angle variation for a slight change from the condition caused by the first variable device is larger than that for a slight change from the condition caused by the second variable device.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: March 19, 2019
    Assignee: OTICS CORPORATION
    Inventors: Koki Yamaguchi, Naoki Hiramatsu, Masatoshi Sugiura
  • Patent number: 10047647
    Abstract: In a variable valve mechanism of an internal combustion engine, when a slider is displaced relative to an input member and an output member in an axial direction, the output member turns relative to the input member in a swing direction, whereby a lift of a valve is increased or reduced. The variable valve mechanism is brought into a lift retaining state when the slider is placed in an idle running range located on a reducing direction side with respect to a boundary position. The lift retaining state is a state where when the slider is displaced in the axial direction, the input member and the output member are displaced together with the slider in the axial direction, so that the relative displacement of the slider and the relative turning of the output member do not occur and the lift of the valve is retained.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: August 14, 2018
    Assignees: OTICS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Hiramatsu, Masatoshi Sugiura, Koki Yamaguchi, Motohiro Yuge
  • Patent number: 10024199
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes an input member, an output member, a slider and a variable device. The output member has internal space formed therein and has a first cutout and a second cutout which are formed at two positions separated from each other in the swing direction so as to extend from an outer periphery of the output member to the internal space, and the input member is mounted in the internal space so as to extend through both inner sides of the first and second cutouts, and is brought into contact with inner side surfaces of the cutouts from both sides in the thrust direction, whereby relative displacement of the input member together with the slider in the thrust direction with respect to the output member is restricted at two positions by the first and second cutouts.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: July 17, 2018
    Assignees: OTICS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Hiramatsu, Koki Yamaguchi, Masahide Sakurai, Motohiro Yuge, Masaaki Tani
  • Patent number: 9879577
    Abstract: A variable valve mechanism of an internal combustion engine includes a plurality of swing members and a variable device that displaces a control shaft to displace a plurality of slider gears of the swing members at a time, thereby changing valve lifts of the plurality of swing members at a time by meshing of helical splines. The swing members include a first swing member for a predetermined cylinder of a plurality of cylinders and a second swing member for a cylinder other than the predetermined cylinder, and a helix angle of the helical splines varies between the first and the second swing members. The variable device displaces the control shaft to a predetermined normal position to perform a normal operation, and displaces the control shaft to a predetermined cylinder cutoff position to perform a cylinder cutoff operation in which the second swing member does not drive a valve.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: January 30, 2018
    Assignees: OTICS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Koki Yamaguchi, Naoki Hiramatsu, Takayuki Maezako, Masatoshi Sugiura, Shinichiro Kikuoka, Masaaki Tani, Motohiro Yuge
  • Publication number: 20170292416
    Abstract: A variable valve mechanism includes a first cam and a second cam, a main arm that drives a valve when swinging, a first sub arm that swings when pressed by the first cam, a second sub arm that swings when pressed by the second cam, and a switch device. The switch device includes a first switch pin that moves between a first coupled position between the main arm and the first sub arm and a first uncoupled position, and a second switch pin that moves between a second coupled position between the main arm and the second sub arm and a second uncoupled position. Both switch pins are arranged so as to be displaced from each other in positions where these switch pins do not overlap at least during a base circle phase in which base circles of both cams act.
    Type: Application
    Filed: March 24, 2017
    Publication date: October 12, 2017
    Inventors: Masatoshi SUGIURA, Naoki Hiramatsu
  • Patent number: 9732641
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that includes a roller arm including a roller that rotatably abuts against a cam and a side arm provided at a side of the roller arm and that drives a valve, and a switching device that includes a switching pin and a hydraulic chamber provided inside the rocker arm and that switches a drive state of the valve by displacing the switching pin between a coupling position at which the switching pin extends between the roller arm and the side arm and a non-coupling position at which the switching pin does not extend between the roller arm and the side arm based on variations in hydraulic pressure in the hydraulic chamber. The switching pin is provided on an axis of the roller, and the hydraulic chamber is provided inside the roller arm.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: August 15, 2017
    Assignee: OTICS CORPORATION
    Inventors: Masatoshi Sugiura, Koki Yamaguchi, Naoki Hiramatsu
  • Publication number: 20170218795
    Abstract: A variable valve mechanism of an internal combustion engine includes a cam, a transmission mechanism, a first variable device that controls the transmission mechanism to continuously change at least a maximum lift amount of a lift curve indicating a lift amount of a valve that corresponds to a rotation angle of the internal combustion engine, and a second variable device that controls the transmission mechanism to continuously change at least an operation angle of the lift curve. When the lift curve lies in any condition within a predetermined range that covers all or part of a variable range of the lift curve, an absolute value of a ratio of a maximum lift amount variation to an operation angle variation for a slight change from the condition caused by the first variable device is larger than that for a slight change from the condition caused by the second variable device.
    Type: Application
    Filed: November 30, 2016
    Publication date: August 3, 2017
    Inventors: Koki YAMAGUCHI, Naoki HIRAMATSU, Masatoshi SUGIURA
  • Patent number: 9556762
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that is swingably supported by a single pivot, and a switching device that operates the rocker arm to switch a drive state of the valve, in which the rocker arm is configured such that at least in a predetermined drive state, a pressing force of the cam is applied disproportionately to one side of the rocker arm in a width direction with respect to a center line when the cam presses a portion of the rocker arm located away from the center line in the width direction. The variable valve mechanism further includes a swing guide that abuts against the rocker arm so that the rocker arm is guided in a swing direction so as not to be tilted in the width direction.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: January 31, 2017
    Assignee: OTICS CORPORATION
    Inventors: Masatoshi Sugiura, Naoki Hiramatsu, Koki Yamaguchi
  • Publication number: 20170016361
    Abstract: In a variable valve mechanism of an internal combustion engine, when a slider is displaced relative to an input member and an output member in an axial direction, the output member turns relative to the input member in a swing direction, whereby a lift of a valve is increased or reduced. The variable valve mechanism is brought into a lift retaining state when the slider is placed in an idle running range located on a reducing direction side with respect to a boundary position. The lift retaining state is a state where when the slider is displaced in the axial direction, the input member and the output member are displaced together with the slider in the axial direction, so that the relative displacement of the slider and the relative turning of the output member do not occur and the lift of the valve is retained.
    Type: Application
    Filed: June 3, 2016
    Publication date: January 19, 2017
    Inventors: Naoki HIRAMATSU, Masatoshi SUGIURA, Koki YAMAGUCHI, Motohiro YUGE
  • Patent number: 9540969
    Abstract: The present invention provides a variable valve mechanism, which includes a rocker arm including an input member and an output member; a switching device that switches a drive state of the valve by displacing the switching pin between a coupling position at which the switching pin extends between the first pinhole in the input member and the second pin hole in the output member and a non-coupling position at which the switching pin does not extend; and a lost motion spring. A displacement clearance is formed between an inner peripheral surface of the first or second pin hole and an outer peripheral surface of the switching pin to permit the relative displacement in a range of the displacement clearance at a coupled time so that a tappet clearance is not formed with the input member urged toward the cam by the lost motion spring.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: January 10, 2017
    Assignee: OTICS CORPORATION
    Inventors: Koki Yamaguchi, Masatoshi Sugiura, Naoki Hiramatsu
  • Publication number: 20160312669
    Abstract: A variable valve mechanism of an internal combustion engine includes a plurality of swing members and a variable device that displaces a control shaft to displace a plurality of slider gears of the swing members at a time, thereby changing valve lifts of the plurality of swing members at a time by meshing of helical splines. The swing members include a first swing member for a predetermined cylinder of a plurality of cylinders and a second swing member for a cylinder other than the predetermined cylinder, and a helix angle of the helical splines varies between the first and the second swing members. The variable device displaces the control shaft to a predetermined normal position to perform a normal operation, and displaces the control shaft to a predetermined cylinder cutoff position to perform a cylinder cutoff operation in which the second swing member does not drive a valve.
    Type: Application
    Filed: March 24, 2016
    Publication date: October 27, 2016
    Inventors: Koki YAMAGUCHI, Naoki HIRAMATSU, Takayuki MAEZAKO, Masatoshi SUGIURA, Shinichiro KIKUOKA, Masaaki TANI, Motohiro YUGE
  • Publication number: 20160281546
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes an input member, an output member, a slider and a variable device. The output member has internal space formed therein and has a first cutout and a second cutout which are formed at two positions separated from each other in the swing direction so as to extend from an outer periphery of the output member to the internal space, and the input member is mounted in the internal space so as to extend through both inner sides of the first and second cutouts, and is brought into contact with inner side surfaces of the cutouts from both sides in the thrust direction, whereby relative displacement of the input member together with the slider in the thrust direction with respect to the output member is restricted at two positions by the first and second cutouts.
    Type: Application
    Filed: January 28, 2016
    Publication date: September 29, 2016
    Inventors: Naoki HIRAMATSU, Koki YAMAGUCHI, Masahide SAKURAI, Motohiro YUGE, Masaaki TANI
  • Publication number: 20160108780
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that includes a roller arm including a roller that rotatably abuts against a cam and a side arm provided at a side of the roller arm and that drives a valve, and a switching device that includes a switching pin and a hydraulic chamber provided inside the rocker arm and that switches a drive state of the valve by displacing the switching pin between a coupling position at which the switching pin extends between the roller arm and the side arm and a non-coupling position at which the switching pin does not extend between the roller arm and the side arm based on variations in hydraulic pressure in the hydraulic chamber. The switching pin is provided on an axis of the roller, and the hydraulic chamber is provided inside the roller arm.
    Type: Application
    Filed: September 16, 2015
    Publication date: April 21, 2016
    Inventors: Masatoshi SUGIURA, Koki Yamaguchi, Naoki Hiramatsu
  • Publication number: 20160108779
    Abstract: The present invention provides a variable valve mechanism, which includes a rocker arm including an input member and an output member; a switching device that switches a drive state of the valve by displacing the switching pin between a coupling position at which the switching pin extends between the first pinhole in the input member and the second pin hole in the output member and a non-coupling position at which the switching pin does not extend; and a lost motion spring. A displacement clearance is formed between an inner peripheral surface of the first or second pin hole and an outer peripheral surface of the switching pin to permit the relative displacement in a range of the displacement clearance at a coupled time so that a tappet clearance is not formed with the input member urged toward the cam by the lost motion spring.
    Type: Application
    Filed: September 16, 2015
    Publication date: April 21, 2016
    Inventors: Koki YAMAGUCHI, Masatoshi SUGIURA, Naoki HIRAMATSU
  • Patent number: 9181826
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine which includes a main arm that is capable of swinging and that drives a valve when swinging, a first sub arm that is provided on one side in the lateral direction of the main arm and that swings when driven by a first cam, a second sub arm that is provided on the other side in the lateral direction of the main arm and that swings when driven by a second cam, and a switch device that performs switching between a first coupled state where only the first sub arm of the first and second sub arms is coupled to the main arm, and a second coupled state where only the second sub arm of the first and second sub arms is coupled to the main arm.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: November 10, 2015
    Assignee: OTICS CORPORATION
    Inventors: Akira Sugiura, Koki Yamaguchi, Naoki Hiramatsu, Takayuki Maezako
  • Publication number: 20150285110
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that is swingably supported by a single pivot, and a switching device that operates the rocker arm to switch a drive state of the valve, in which the rocker arm is configured such that at least in a predetermined drive state, a pressing force of the cam is applied disproportionately to one side of the rocker arm in a width direction with respect to a center line when the cam presses a portion of the rocker arm located away from the center line in the width direction. The variable valve mechanism further includes a swing guide that abuts against the rocker arm so that the rocker arm is guided in a swing direction so as not to be tilted in the width direction.
    Type: Application
    Filed: March 19, 2015
    Publication date: October 8, 2015
    Inventors: Masatoshi Sugiura, Naoki Hiramatsu, Koki Yamaguchi
  • Patent number: 8960144
    Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a main arm having at a rear end thereof a supported portion that is continuously supported swingably by a support member without floating upward, a sub arm which has a tip end to which a roller contacting a cam is rotatably attached, in which a center of the roller is located rearward of the pressing portion and forward of a swing center of the supported portion, which has a rear end that is swingably supported with respect to the main arm by a support pin, and in which a center of the support pin is located rearward of the center of the roller and forward of the swing center of the supported portion, and a switch pin that is inserted in a central portion of the roller.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: February 24, 2015
    Assignee: Otics Corporation
    Inventors: Naoki Hiramatsu, Koki Yamaguchi, Akira Sugiura, Takayuki Maezako