WO2023218742A1 - 内燃機関 - Google Patents

内燃機関 Download PDF

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Publication number
WO2023218742A1
WO2023218742A1 PCT/JP2023/008833 JP2023008833W WO2023218742A1 WO 2023218742 A1 WO2023218742 A1 WO 2023218742A1 JP 2023008833 W JP2023008833 W JP 2023008833W WO 2023218742 A1 WO2023218742 A1 WO 2023218742A1
Authority
WO
WIPO (PCT)
Prior art keywords
facing surface
flame
peripheral wall
combustion chamber
swirl flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/008833
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
俊宏 谷
好二 百瀬
義博 堀田
謹 河合
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Priority to DE112023002145.7T priority Critical patent/DE112023002145T5/de
Priority to AU2023269454A priority patent/AU2023269454B2/en
Publication of WO2023218742A1 publication Critical patent/WO2023218742A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
    • F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • This invention relates to an internal combustion engine.
  • Japanese Patent Publication No. 2011-502226 discloses an internal combustion engine that includes a cylinder, a piston, a cylinder head, and a fuel injection device.
  • a piston bowl is provided on the top surface of the piston.
  • the piston bowl has an upwardly open outer bowl part and protrusions evenly distributed on the circumference of the outer bowl part.
  • the flame that collides with each of the parts of the outer bowl portion that are adjacent to each other in the circumferential direction across the protrusion is directed toward the center of the combustion chamber by the protrusion. do.
  • flames that are adjacent to each other across the protrusion may interfere with each other, resulting in the flames staying in the vicinity of the outer bowl portion.
  • the use of air in the center of the combustion chamber is not promoted, resulting in a decrease in combustion efficiency.
  • An object of the present invention is to provide an internal combustion engine in which combustion in the combustion chamber can be improved.
  • An internal combustion engine includes a cylinder liner having a cylindrical inner peripheral surface, a cylinder head connected to the cylinder liner and having an intake port and an exhaust port, and a cylinder head configured to open and close the intake port.
  • the injector injects the fuel outward in the radial direction of the cylinder liner from a central portion of the combustion chamber, and the piston is formed by igniting the fuel injected from the injector.
  • a peripheral wall that is formed at a position where it collides with the flame of the cylinder liner and has a shape that connects in the circumferential direction of the cylinder liner; a plurality of protruding walls having a shape protruding toward a central portion, the protruding walls facing the swirl flow in the flow direction of the swirl flow, and directing the flames that collided with the peripheral wall into the combustion chamber. and a oppositely facing surface that faces the swirl flow in a direction opposite to the flow direction of the swirl flow.
  • the momentum of the flame returning to the central part of the combustion chamber via the opposing surface is greater than the momentum of the flame returning to the central part of the combustion chamber via the opposite opposing surface after colliding with the peripheral wall. It is composed of
  • FIG. 1 is a plan view schematically showing an internal combustion engine in an embodiment of the present invention.
  • 2 is a sectional view taken along line II-II in FIG. 1.
  • FIG. FIG. 3 is a perspective view of the cavity of the piston.
  • FIG. 3 is a plan view schematically showing a cavity. It is an enlarged view of the vicinity of a protruding wall.
  • FIG. 1 is a plan view schematically showing an internal combustion engine in an embodiment of the present invention.
  • FIG. 2 is a sectional view taken along line II-II in FIG. 1.
  • the internal combustion engine 1 includes a cylinder liner 100, a cylinder head 200, an intake valve 300, an exhaust valve 400, a piston 500, and an injector 600. Note that although only one cylinder is shown in FIGS. 1 and 2, the internal combustion engine 1 can also be applied to a multi-cylinder type.
  • Cylinder liner 100 is formed into a cylindrical shape.
  • Cylinder head 200 is connected to the end of cylinder liner 100.
  • the cylinder head 200 is formed into a disk shape.
  • the cylinder head 200 has an intake port h1 and an exhaust port h2.
  • the intake valve 300 opens and closes the intake port h1. Intake valve 300 is held by cylinder head 200.
  • the exhaust valve 400 opens and closes the exhaust port h2. Exhaust valve 400 is held by cylinder head 200.
  • the piston 500 is movable relative to the cylinder liner 100 along the central axis direction of the cylinder liner 100 (vertical direction in FIG. 2). As shown in FIG. 2, the piston 500 has a cavity CA formed at a position facing the cylinder head 200. The cavity CA has a shape recessed from the top surface 504 of the piston 500 in a direction away from the cylinder head 200 (downward in FIG. 2). A combustion chamber is formed between the piston 500 and the cylinder head 200 including the cavity CA. Piston 500 has a partition wall 502 that partitions cavity CA.
  • the cylinder head 200 and the intake valve 300 are configured to form a swirl flow SW (see FIG. 3) in the combustion chamber.
  • the injector 600 is provided in the cylinder head 200 at a position facing the central axis of the cylinder liner 100. Injector 600 injects fuel from cylinder head 200 toward cavity CA. More specifically, the injector 600 injects fuel outward in the radial direction of the cylinder liner 100 from the center of the combustion chamber.
  • FIG. 3 is a perspective view of the piston cavity.
  • FIG. 4 is a plan view schematically showing the cavity.
  • the partition wall 502 includes a bottom wall 510, a peripheral wall 520, and a plurality of protruding walls 530.
  • the bottom wall 510 faces the injector 600 in the direction of the central axis of the cylinder liner 100. As shown in FIG. 2, the bottom wall 510 has a shape that is inclined so as to gradually move away from the cylinder head 200 as it goes outward in the radial direction from a central portion facing the injector 600 in the central axis direction. ing.
  • the peripheral wall 520 has a shape that stands up from the edge of the bottom wall 510.
  • the peripheral wall 520 has a shape that extends in the circumferential direction of the cylinder liner 100 in an annular shape.
  • the peripheral wall 520 is formed at a position where it collides with the flame B formed when the fuel injected from the injector 600 ignites. As shown in FIGS. 2 and 3, the peripheral wall 520 has a shape that curves outward in the radial direction.
  • Each protruding wall 530 has a shape that protrudes from the peripheral wall 520 toward the center of the combustion chamber.
  • the plurality of protruding walls 530 are provided at intervals along the circumferential direction. It is preferable that the plurality of protruding walls 530 are arranged at equal intervals along the circumferential direction.
  • the number of protruding walls 530 is set to about 7 to 10, for example. In this embodiment, the number of protruding walls 530 is set to nine.
  • the protruding wall 530 has a directly facing surface 532 and a reversely facing surface 534.
  • the directly facing surface 532 faces the swirl flow SW in the flow direction of the swirl flow SW.
  • the directly facing surface 532 guides the flame B that collided with the peripheral wall 520 to the center of the combustion chamber.
  • the directly facing surface 532 has a shape that is curved to be convex in the flow direction of the swirl flow SW.
  • the opposite facing surface 534 faces the swirl flow SW in a direction opposite to the flow direction of the swirl flow SW.
  • the opposite facing surface 534 has a shape that is curved so as to be convex in a direction opposite to the flow direction of the swirl flow SW.
  • the directly facing surface 532 is configured such that the momentum of the flame B1 that returns to the central part of the combustion chamber via the directly facing surface 532 after colliding with the peripheral wall 520 is The momentum of the flame B2 returning to the center of the combustion chamber via the surface 534 is larger than that of the flame B2.
  • the radius of curvature of the directly facing surface 532 is formed to be larger than the radius of curvature of the oppositely facing surface 534.
  • the radius of curvature of the directly facing surface 532 is preferably about 1.5 to 5 times, more preferably about 2 times, the radius of curvature of the oppositely facing surface 534.
  • the flame B1 is shown by a solid line
  • the flame B2 is shown by a broken line.
  • the directly facing surface 532 guides the tip of the flame B1 toward the center of the combustion chamber while suppressing the decrease in momentum of the flame B1 that collides with the directly facing surface 532, while the oppositely facing surface 534 guides the tip of the flame B1 toward the center of the combustion chamber.
  • the tip of the flame B2 is moved between the flames B1 adjacent to each other in the circumferential direction in the combustion chamber and in the space S near the protruding wall 530 (Fig. 5)).
  • the flame B1 that has passed through the directly facing surface 532 after colliding with the peripheral wall 520 tries to return to the central part of the combustion chamber, while after colliding with the peripheral wall 520
  • the flame B2 that has passed through the opposite facing surface 534 tends to stay in the space near the peripheral wall 520 in the combustion chamber. Therefore, the flame B1 that collided with the directly facing surface 532 of the one protruding wall 530 and the flame B1 that collided with the oppositely facing surface 534 of the one protruding wall 530 interfere with each other, and due to this, the Flame stagnation in the vicinity is suppressed. Therefore, the use of air in the center of the combustion chamber is promoted, and combustion is improved.
  • the directly facing surface 532 and the oppositely facing surface 534 are not limited to curved shapes.
  • both the directly facing surface 532 and the oppositely facing surface 534 may be formed flat, or only one of them may be formed in a curved shape.
  • a cylinder liner having a cylindrical inner peripheral surface; a cylinder head connected to the cylinder liner and having an intake port and an exhaust port; an intake valve that opens and closes the intake port; an exhaust valve that opens and closes the exhaust port; a piston that is movable relative to the cylinder liner in a central axis direction of the cylinder liner and has a cavity formed at a position facing the cylinder head; an injector that injects fuel from the cylinder head toward the cavity, The cylinder head and the intake valve are configured to form a swirl flow in a combustion chamber formed between the cylinder head and the piston, The injector injects the fuel outward in a radial direction of the cylinder liner from a central portion of the combustion chamber,
  • the piston is a peripheral wall formed at a position where the fuel injected from the injector collides with a flame formed by ignition, and having a shape that extends in the circumferential direction of the cylinder liner; a plurality of protruding walls provided at intervals in
  • the flame that has passed through the directly facing surface after colliding with the peripheral wall attempts to return to the center of the combustion chamber, while the flame that has passed through the oppositely facing surface after colliding with the peripheral wall is located on the peripheral wall of the combustion chamber. Attempts to stay in nearby space. Therefore, the flame that collides with the directly facing surface of one protruding wall and the flame that collides with the oppositely facing surface of the one protruding wall interfere with each other, and as a result of this, the flame stagnates in the vicinity of the peripheral wall. is suppressed. Therefore, the use of air in the center of the combustion chamber is promoted, and combustion is improved.
  • the directly facing surface has a shape that is curved so as to be convex in the flow direction of the swirl flow
  • the opposite facing surface has a shape convexly curved in a direction opposite to the flow direction of the swirl flow

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
PCT/JP2023/008833 2022-05-09 2023-03-08 内燃機関 Ceased WO2023218742A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112023002145.7T DE112023002145T5 (de) 2022-05-09 2023-03-08 Verbrennungsmotor
AU2023269454A AU2023269454B2 (en) 2022-05-09 2023-03-08 Internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-076997 2022-05-09
JP2022076997A JP2023166161A (ja) 2022-05-09 2022-05-09 内燃機関

Publications (1)

Publication Number Publication Date
WO2023218742A1 true WO2023218742A1 (ja) 2023-11-16

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ID=88729867

Family Applications (1)

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PCT/JP2023/008833 Ceased WO2023218742A1 (ja) 2022-05-09 2023-03-08 内燃機関

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JP (1) JP2023166161A (enExample)
AU (1) AU2023269454B2 (enExample)
DE (1) DE112023002145T5 (enExample)
WO (1) WO2023218742A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118959179A (zh) * 2024-10-12 2024-11-15 潍柴动力股份有限公司 一种活塞及发动机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024232194A1 (ja) * 2023-05-11 2024-11-14 株式会社豊田自動織機 内燃機関

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635597A (en) * 1985-01-16 1987-01-13 Yanmar Diesel Engine Co., Ltd. Structure of a main combustion chamber of a diesel engine of a direct injection type
JP2013177844A (ja) * 2012-02-28 2013-09-09 Hino Motors Ltd 直接噴射式ディーゼルエンジン、及び直接噴射式ディーゼルエンジン用ピストン
JP2015105570A (ja) * 2013-11-28 2015-06-08 株式会社豊田中央研究所 ディーゼルエンジン
EP3176402A1 (en) * 2015-12-02 2017-06-07 Caterpillar Energy Solutions GmbH Piston for a gaseous fuel internal combustion engine
JP2018155161A (ja) * 2017-03-17 2018-10-04 マツダ株式会社 ディーゼルエンジン

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5226795B2 (ja) 2007-10-30 2013-07-03 ボルボ ラストバグナー アーベー 車両の燃焼機関の排気を削減する装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635597A (en) * 1985-01-16 1987-01-13 Yanmar Diesel Engine Co., Ltd. Structure of a main combustion chamber of a diesel engine of a direct injection type
JP2013177844A (ja) * 2012-02-28 2013-09-09 Hino Motors Ltd 直接噴射式ディーゼルエンジン、及び直接噴射式ディーゼルエンジン用ピストン
JP2015105570A (ja) * 2013-11-28 2015-06-08 株式会社豊田中央研究所 ディーゼルエンジン
EP3176402A1 (en) * 2015-12-02 2017-06-07 Caterpillar Energy Solutions GmbH Piston for a gaseous fuel internal combustion engine
JP2018155161A (ja) * 2017-03-17 2018-10-04 マツダ株式会社 ディーゼルエンジン

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118959179A (zh) * 2024-10-12 2024-11-15 潍柴动力股份有限公司 一种活塞及发动机

Also Published As

Publication number Publication date
AU2023269454B2 (en) 2025-12-18
DE112023002145T5 (de) 2025-03-20
JP2023166161A (ja) 2023-11-21
AU2023269454A1 (en) 2024-10-17

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