Patents by Inventor Masaki Tojo
Masaki Tojo 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).
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Patent number: 11976667Abstract: A centrifugal compressor comprises: an impeller; an inlet pipe portion forming an intake passage to introduce air to the impeller; and a throttle mechanism capable of reducing a flow passage area of the intake passage upstream of the impeller. The throttle mechanism includes an annular portion configured to move between a first position and a second position upstream of the first position in an axial direction of the impeller. In a cross-section along a rotational axis of the impeller, an outer peripheral surface of the annular portion is formed to smoothly connect a leading edge and a trailing edge of the annular portion.Type: GrantFiled: March 19, 2019Date of Patent: May 7, 2024Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Kenichiro Iwakiri, Isao Tomita, Masaki Tojo, Takashi Yoshimoto
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Publication number: 20220154729Abstract: A centrifugal compressor comprises: an impeller; an inlet pipe portion forming an intake passage to introduce air to the impeller; and a throttle mechanism capable of reducing a flow passage area of the intake passage upstream of the impeller. The throttle mechanism includes an annular portion configured to move between a first position and a second position upstream of the first position in an axial direction of the impeller. In a cross-section along a rotational axis of the impeller, an outer peripheral surface of the annular portion is formed to smoothly connect a leading edge and a trailing edge of the annular portion.Type: ApplicationFiled: March 19, 2019Publication date: May 19, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Kenichiro IWAKIRI, Isao TOMITA, Masaki TOJO, Takashi YOSHIMOTO
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Patent number: 11092068Abstract: A variable geometry turbocharger includes: a turbine rotor; and a variable nozzle mechanism for adjusting a flow of exhaust gas to the turbine rotor from a scroll flow passage formed on a radially outer side of the turbine rotor. The variable nozzle mechanism includes: a nozzle vane disposed in an exhaust gas flow passage for guiding the exhaust gas to the turbine rotor from the scroll flow passage; a support wall forming a flow passage wall on a first side of the exhaust gas flow passage with respect to an axial direction of the turbine rotor and supporting the nozzle vane rotatably in a cantilever fashion; and a non-support wall forming a flow passage wall on a second side of the exhaust gas flow passage with respect to the axial direction. Of an end surface of the nozzle vane on a side of the non-support wall, an edge portion on a side of a pressure surface includes a non-support-wall side linear portion formed to have a linear shape.Type: GrantFiled: March 30, 2016Date of Patent: August 17, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Takao Yokoyama, Toru Hoshi, Masaki Tojo
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Patent number: 10890105Abstract: The present invention includes: a turbine wheel 24 that is attached to a rotating shaft 14 and that has a plurality of turbine blades in the circumferential direction; scroll passages 15Aa, 15Ab that are formed in a spiral shape on the outside of the turbine wheel 24, and that are formed by being divided into a plurality of sections in the circumferential direction, the passages communicating with each other at the position of the turbine wheel 24 disposed between respective tongue sections 15Ac, 15Ad; and threads 51 that are provided on an back facing surface 41 disposed so as to oppose the back surface of the turbine wheel 24, the back surface being on the axially opposite side from the turbine blade side, and the linear parts extending from starting points 51a near the tongue sections 15Ac, 15Ad toward the rotating shaft 14 side so as to control the passage of fluid between the back surface and the back facing surface 41.Type: GrantFiled: February 28, 2017Date of Patent: January 12, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Reiko Takashima, Takao Yokoyama, Masaki Tojo
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Publication number: 20200123966Abstract: A variable geometry turbocharger includes: a turbine rotor; and a variable nozzle mechanism for adjusting a flow of exhaust gas to the turbine rotor from a scroll flow passage formed on a radially outer side of the turbine rotor. The variable nozzle mechanism includes: a nozzle vane disposed in an exhaust gas flow passage for guiding the exhaust gas to the turbine rotor from the scroll flow passage; a support wall forming a flow passage wall on a first side of the exhaust gas flow passage with respect to an axial direction of the turbine rotor and supporting the nozzle vane rotatably in a cantilever fashion; and a non-support wall forming a flow passage wall on a second side of the exhaust gas flow passage with respect to the axial direction. Of an end surface of the nozzle vane on a side of the non-support wall, an edge portion on a side of a pressure surface includes a non-support-wall side linear portion formed to have a linear shape.Type: ApplicationFiled: March 30, 2016Publication date: April 23, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Takao YOKOYAMA, Toru HOSHI, Masaki TOJO
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Publication number: 20190323422Abstract: The present invention includes: a turbine wheel 24 that is attached to a rotating shaft 14 and that has a plurality of turbine blades in the circumferential direction; scroll passages 15Aa, 15Ab that are formed in a spiral shape on the outside of the turbine wheel 24, and that are formed by being divided into a plurality of sections in the circumferential direction, the passages communicating with each other at the position of the turbine wheel 24 disposed between respective tongue sections 15Ac, 15Ad; and threads 51 that are provided on an back facing surface 41 disposed so as to oppose the back surface of the turbine wheel 24, the back surface being on the axially opposite side from the turbine blade side, and the linear parts extending from starting points 51a near the tongue sections 15Ac, 15Ad toward the rotating shaft 14 side so as to control the passage of fluid between the back surface and the back facing surface 41.Type: ApplicationFiled: February 28, 2017Publication date: October 24, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Reiko TAKASHIMA, Takao YOKOYAMA, Masaki TOJO
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Patent number: 10385765Abstract: An object is to is to reduce a leakage flow by reducing a clearance between an end surface of a nozzle vane, forming a variable nozzle mechanism of a variable geometry turbocharger, and a wall surface facing the end surface, and prevent the nozzle vane from being stuck due to contact of the end surface.Type: GrantFiled: December 27, 2012Date of Patent: August 20, 2019Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Takao Yokoyama, Masaki Tojo, Satomi Nagae, Masaki Osako
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Patent number: 10234038Abstract: A valve, which is provided in an exhaust passage of an internal combustion engine to release exhaust, includes a valve seat having an opening opened to the exhaust passage, a valve body having a conical surface or a spherical surface configured to close the opening by coming into contact with the valve seat, a movement unit configured to move the valve body in a direction of intersecting the opening, and an urging unit configured to urge the valve body in the direction of intersecting the opening, and the urging unit controls urging force by the movement unit in a direction of suppressing vibration of the valve body caused by vibration of exhaust pulse frequency determined by a speed of the internal combustion engine and a number of cylinders of the internal combustion engine.Type: GrantFiled: November 12, 2012Date of Patent: March 19, 2019Assignee: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.Inventors: Yukihide Nagayo, Hiroyuki Hosoya, Masaki Tojo, Yusuke Furuta
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Patent number: 10151344Abstract: A turbocharger comprises: a rolling bearing provided with a plurality of rolling elements arranged between a raceway formed on an inner ring and a raceway formed on an outer ring; and a housing for holding the outer ring. The housing is provided with: a first dam for restricting the outflow of a lubricant through a first discharge passage for discharging the lubricant from the outer ring; and a second dam for restricting the outflow of the lubricant through a second discharge passage for discharging the lubricant from an opening formed so as to be in communication with an axially intermediate portion of the outer ring and with a peripheral wall of a space.Type: GrantFiled: May 29, 2015Date of Patent: December 11, 2018Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yoshitomo Noda, Masaki Tojo
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Patent number: 9926938Abstract: In a variable geometry turbocharger including a variable nozzle mechanism, an object is to enhance safety upon malfunction of the variable nozzle mechanism as well as to improve accuracy in the control of the variable nozzle mechanism by applying a moment that acts on the nozzle vanes in an opening direction securely and stably.Type: GrantFiled: February 26, 2013Date of Patent: March 27, 2018Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao Yokoyama, Katsuyuki Osako, Isao Tomita, Yasuaki Jinnai, Masaki Tojo, Satomi Nagae
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Publication number: 20170314616Abstract: A turbocharger comprises: a rolling bearing provided with a plurality of rolling elements arranged between a raceway formed on an inner ring and a raceway formed on an outer ring; and a housing for holding the outer ring. The housing is provided with: a first dam for restricting the outflow of a lubricant through a first discharge passage for discharging the lubricant from the outer ring; and a second dam for restricting the outflow of the lubricant through a second discharge passage for discharging the lubricant from an opening formed so as to be in communication with an axially intermediate portion of the outer ring and with a peripheral wall of a space.Type: ApplicationFiled: May 29, 2015Publication date: November 2, 2017Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Yoshitomo NODA, Masaki TOJO
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Patent number: 9790957Abstract: An object is to provide an air intake duct structure for a centrifugal fluid machine, capable of swirling the fluid introduced into the impeller in the reverse direction to increase the pressure ratio when the flow rate is high and swirling the fluid in the forward direction to avoid a surging when the flow rate is low, as well as securing a wide operating range, without using mechanical means. The centrifugal fluid machine 1 includes an impeller 12 mounted to a rotation shaft and a housing 4 for housing the impeller 12. The air intake duct structure 10 is for directing a fluid “f” to a rotational center 12a of the impeller 12 housed in the housing 4 via an intake duct portion 4a of the housing 4 protruding in an axial direction of the rotation shaft, the fluid “f” flowing in a substantially orthogonal direction to a rotational axis line 3.Type: GrantFiled: February 26, 2013Date of Patent: October 17, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Isao Tomita, Masaki Tojo, Takao Yokoyama
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Patent number: 9777578Abstract: An object is to provide a radial turbine blade that can reduce an impact loss of inflowing gas at a leading edge of the turbine blade and achieve a higher turbine efficiency, even in a case of a flow field corresponding to a low turbine operational velocity ratio U/C0 due to a throttling operation on a variable nozzle mechanism of a variable geometry turbocharger. In a radial turbine blade, a hub-side end portion Pa at a leading edge 51 of a turbine blade 50 is formed to be positioned more on a rear side in a rotation direction R of the turbine blade 50 than a shroud-side end portion Sc at the leading edge 51, and a straight line connecting between the shroud-side end portion Sc and the hub-side end portion Pa is inclined with respect to a straight line extending in a rotation axis direction from the shroud-side end portion Sc at the leading edge 51 onto a hub 17 surface by an angle in a range from 30° to 70° as viewed in the radial direction of the turbine blade 50.Type: GrantFiled: December 27, 2012Date of Patent: October 3, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao Yokoyama, Masaki Tojo, Satomi Nagae
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Publication number: 20150330226Abstract: An object is to provide a radial turbine blade that can reduce an impact loss of inflowing gas at a leading edge of the turbine blade and achieve a higher turbine efficiency, even in a case of a flow field corresponding to a low turbine operational velocity ratio U/C0 due to a throttling operation on a variable nozzle mechanism of a variable geometry turbocharger. In a radial turbine blade, a hub-side end portion Pa at a leading edge 51 of a turbine blade 50 is formed to be positioned more on a rear side in a rotation direction R of the turbine blade 50 than a shroud-side end portion Sc at the leading edge 51, and a straight line connecting between the shroud-side end portion Sc and the hub-side end portion Pa is inclined with respect to a straight line extending in a rotation axis direction from the shroud-side end portion Sc at the leading edge 51 onto a hub 17 surface by an angle in a range from 30° to 70° as viewed in the radial direction of the turbine blade 50.Type: ApplicationFiled: December 27, 2012Publication date: November 19, 2015Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao YOKOYAMA, Masaki TOJO, Satomi NAGAE
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Publication number: 20150330293Abstract: An object is to is to reduce a leakage flow by reducing a clearance between an end surface of a nozzle vane, forming a variable nozzle mechanism of a variable geometry turbocharger, and a wall surface facing the end surface, and prevent the nozzle vane from being stuck due to contact of the end surface.Type: ApplicationFiled: December 27, 2012Publication date: November 19, 2015Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao YOKOYAMA, Masaki TOJO, Satomi NAGAE, Masaki OSAKO
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Publication number: 20150104296Abstract: In a variable geometry turbocharger including a variable nozzle mechanism, an object is to enhance safety upon malfunction of the variable nozzle mechanism as well as to improve accuracy in the control of the variable nozzle mechanism by applying a moment that acts on the nozzle vanes in an opening direction securely and stably.Type: ApplicationFiled: February 26, 2013Publication date: April 16, 2015Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao Yokoyama, Katsuyuki Osako, Isao Tomita, Yasuaki Jinnai, Masaki Tojo, Satomi Nagae
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Publication number: 20150050136Abstract: An object is to provide an air intake duct structure for a centrifugal fluid machine, capable of swirling the fluid introduced into the impeller in the reverse direction to increase the pressure ratio when the flow rate is high and swirling the fluid in the forward direction to avoid a surging when the flow rate is low, as well as securing a wide operating range, without using mechanical means. The centrifugal fluid machine 1 includes an impeller 12 mounted to a rotation shaft and a housing 4 for housing the impeller 12. The air intake duct structure 10 is for directing a fluid “f” to a rotational center 12a of the impeller 12 housed in the housing 4 via an intake duct portion 4a of the housing 4 protruding in an axial direction of the rotation shaft, the fluid “f” flowing in a substantially orthogonal direction to a rotational axis line 3.Type: ApplicationFiled: February 26, 2013Publication date: February 19, 2015Inventors: Isao Tomita, Masaki Tojo, Takao Yokoyama
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Publication number: 20150014564Abstract: A valve, which is provided in an exhaust passage of an internal combustion engine to release exhaust, includes a valve seat having an opening opened to the exhaust passage, a valve body having a conical surface or a spherical surface configured to close the opening by coming into contact with the valve seat, a movement unit configured to move the valve body in a direction of intersecting the opening, and an urging unit configured to urge the valve body in the direction of intersecting the opening, and the urging unit controls urging force by the movement unit in a direction of suppressing vibration of the valve body caused by vibration of exhaust pulse frequency determined by a speed of the internal combustion engine and a number of cylinders of the internal combustion engine.Type: ApplicationFiled: November 12, 2012Publication date: January 15, 2015Inventors: Yukihide Nagayo, Hiroyuki Hosoya, Masaki Tojo, Yusuke Furuta
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Patent number: 8888440Abstract: A compressor of an exhaust gas turbocharger has a compressor housing of a divided type that forms an inlet slit, an outlet slit and a recirculation passage at the same time when the compressor housing is assembled. In the compressor of the exhaust gas turbocharger, mating surfaces of compressor housing members 9a and 9b are formed in the neighborhood of the inlet part of the impeller 5 in the compressor housing 9 that is divided into the compressor housing members 9a and 9b in the direction of the rotation axis of the impeller; and, a space forming the recirculation passage 29, an inlet slit 25 and an outlet slit 27 are formed between the mating compressor housing members 9a and 9b.Type: GrantFiled: August 10, 2010Date of Patent: November 18, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Isao Tomita, Seiichi Ibaraki, Yasuaki Jinnai, Masaki Tojo
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Patent number: 8833074Abstract: An exhaust-bypass valve capable of reducing wear of a rotating shaft to prevent controllability from deteriorating is provided. An exhaust-bypass valve (1) of a turbocharger includes a shunting passage (5) that communicates between a passage (3) at the turbine-inlet side and a passage (4) at the turbine-outlet side and a valve flap (6) that opens and closes this shunting passage (5). The valve flap (6) opens and closes to shunt a gas flowing through the passage (3) at the turbine-inlet side into the passage at the turbine-outlet side. The valve flap (6) is rotatably supported at one side thereof serving as a center-of-rotation side, and the other side thereof moves away from or towards the shunting passage (5) to open or close the shunting passage (5). A tapered portion (10) is provided at an edge on the other side. The edge is at least one of an edge of an opening of the shunting passage (5) facing the valve flap (6) and a side surface of the valve flap (6) facing the shunting passage (5).Type: GrantFiled: February 20, 2009Date of Patent: September 16, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Noriyuki Hayashi, Mitsushige Kubota, Takao Yokoyama, Masaki Tojo