GB2620058A - A cylinder head for a lean-burn gasoline engine - Google Patents

A cylinder head for a lean-burn gasoline engine Download PDF

Info

Publication number
GB2620058A
GB2620058A GB2315163.2A GB202315163A GB2620058A GB 2620058 A GB2620058 A GB 2620058A GB 202315163 A GB202315163 A GB 202315163A GB 2620058 A GB2620058 A GB 2620058A
Authority
GB
United Kingdom
Prior art keywords
combustion chamber
surface portion
sloped surface
cylinder head
spark plug
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.)
Pending
Application number
GB2315163.2A
Other versions
GB202315163D0 (en
Inventor
Johnson Jack
Mcwilliam Lyn
Drinkwater Simon
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.)
Jaguar Land Rover Ltd
Original Assignee
Jaguar Land Rover Ltd
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 Jaguar Land Rover Ltd filed Critical Jaguar Land Rover Ltd
Publication of GB202315163D0 publication Critical patent/GB202315163D0/en
Publication of GB2620058A publication Critical patent/GB2620058A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B23/101—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
    • 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
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B2023/106—Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

A cylinder head (53) for a lean-burn gasoline engine comprising a combustion chamber (50) extending into the cylinder head (53) away from a gasket interface surface (58). The combustion chamber (50) comprises a combustion chamber roof surface (90) which has a central domed surface portion (99) and a sloped surface portion (94, 95) which comprises a substantially straight cross-section along a plane of symmetry (87) of the combustion chamber (50). In use, a spark plug seat (75) supports a spark plug (82) in a fixed position within the domed portion (88) of the combustion chamber (50) and the sloped surface portion (94, 95) of the combustion chamber roof is configured so that a geometric extension of the sloped surface portion is coincidental with the spark plug gap. The combustion chamber may also be configured so that the apex of a geometric extension (84, 85) of the sloped surface portion (94, 95) of the combustion chamber roof is located within a volume envelope that is described by a 360° rotation of the spark plug tip.

Claims (20)

1. A cylinder head for a lean-burn gasoline engine, the cylinder head comprising: a substantially planar gasket interface surface; a combustion chamber extending into the cylinder head away from the gasket interface surface, wherein the combustion chamber comprises a combustion chamber roof surface having: a central domed surface portion defining a central domed portion of the combustion chamber; and a sloped surface portion defining a sloped portion of the combustion chamber, wherein the sloped surface portion comprises a substantially straight cross-section along a plane of symmetry of the combustion chamber, and a spark plug seat configured to support a spark plug, in use, such that a spark gap of the spark plug is held in a substantially fixed position within the domed portion of the combustion chamber, wherein the sloped surface portion of the combustion chamber roof is configured so that a geometric extension of the sloped surface portion is coincidental with the spark plug gap in use.
2. A cylinder head as claimed in claim 1, wherein the sloped surface portion conforms to part of the surface of a cone.
3. A cylinder head as claimed in claim 1 or 2, comprising two sloped surface portions located on opposite sides of the combustion chamber.
4. A cylinder head as claimed in claim 3, wherein the sloped surface portions comprise a first sloped surface portion located adjacent a combustion chamber air inlet opening, and a second sloped surface portion located adjacent a combustion chamber exhaust outlet opening.
5. A cylinder head as claimed in claim 4, wherein the combustion chamber comprises a pair of air inlet openings and a pair of exhaust outlet openings, wherein the first sloped surface portion is at least partially located between the pair of air inlet openings, and wherein the second sloped surface portion is at least partially located between the pair of exhaust outlet openings.
6. A cylinder head as claimed in claim 5, wherein the surface area of the first sloped surface portion is less than the surface area of the second sloped surface portion.
7. A cylinder head as claimed in claim 6, wherein the length of the first sloped surface portion along the plane of symmetry of the combustion chamber is less than the length of the second sloped surface portion along the plane of symmetry of the combustion chamber.
8. A cylinder head as claimed in any one of claims 5 to 7, wherein the first sloped surface portion comprises an innermost edge at an interface between the first sloped surface portion and the central domed portion, and wherein the second sloped surface portion comprises an innermost edge at an interface between the second sloped surface portion and the central domed portion, wherein the length of the innermost edge of the first sloped surface portion is substantially equal to the length of the innermost edge of the second sloped surface portion.
9. A cylinder head as claimed in any one of claims 5 to 8, wherein the innermost edge of the first sloped surface portion is located between the pair of air inlet openings no further towards the centre of the combustion chamber than the shortest possible line joining the outermost extremities of the air inlet openings, and wherein the innermost edge of the second sloped surface portion is located between the pair of exhaust outlet openings no further towards the centre of the combustion chamber than the shortest possible line joining the outermost extremities of the exhaust outlet openings.
10. A cylinder head as claimed in any one of claims 5 to 9, wherein the ratio of: the width of a projection of the combustion chamber onto a plane parallel to the gasket interface surface measured in a direction along the plane of symmetry of the combustion chamber; and the width of a projection of the central domed portion of the combustion chamber onto a plane parallel to the gasket interface surface measured in a direction along the plane of symmetry of the combustion chamber, is about 1.7:1.
11. A cylinder head as claimed in any one of claims 3 to 10, wherein the angle between the gasket interface surface and each sloped surface portion measured along the plane of symmetry of the combustion chamber are substantially equal.
12. A cylinder head as claimed in any preceding claim, wherein the combustion chamber roof surface comprises concave curved portions located between an outermost edge of the combustion chamber and the or each sloped surface portion.
13. A cylinder head as claimed in any preceding claim, wherein the central domed portion of the combustion chamber is elongated in a direction perpendicular to the plane of symmetry of the combustion chamber.
14. A cylinder head as claimed in any preceding claim, wherein the spark plug seat comprises an opening in the central domed surface of the combustion chamber located such that it intersects the plane of symmetry of the combustion chamber.
15. A cylinder head as claimed in claim 14, wherein the combustion chamber comprises a fuel injector seat opening in the central domed surface of the combustion chamber, wherein the fuel injector seat opening is located such that it intersects the plane of symmetry of the combustion chamber, wherein the fuel injector seat opening is positioned further towards the pair of air inlet openings than the spark plug seat opening.
16. A cylinder head for a lean-burn gasoline engine, the cylinder head comprising: a combustion chamber extending into the cylinder head, the combustion chamber comprising a combustion chamber roof surface having a sloped surface portion, wherein the sloped surface portion conforms to part of the surface of a cone; and a spark plug seat configured to support the tip of a spark plug at a predetermined position within the combustion chamber in use, wherein the combustion chamber is configured so that the apex of a geometric extension of the sloped surface portion of the combustion chamber roof surface is located within a volume envelope that is described by a 360° rotation of the spark plug tip when the spark plug tip is supported at the predetermined position in the combustion chamber.
17. A lean-burn gasoline engine comprising a cylinder head as claimed in any one of claims 1 to 16.
18. A lean-burn gasoline engine as claimed in claim 17, comprising a piston having a working surface configured to conform to at least part of the or each sloped surface portion of the combustion chamber roof surface in use.
19. A lean-burn gasoline engine as claimed in claim 18, wherein the gap between the sloped surface portion of the combustion chamber roof surface and the conforming part of the working surface of the piston is no less than 0.8mm and no more than 1.4mm when the piston is at top dead centre as measured when the engine is at substantially the same temperature as the environment.
20. A vehicle comprising a lean-burn gasoline engine according to any one of claims 17 to 19.
GB2315163.2A 2021-03-26 2021-03-26 A cylinder head for a lean-burn gasoline engine Pending GB2620058A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/057928 WO2022199842A1 (en) 2021-03-26 2021-03-26 A cylinder head for a lean-burn gasoline engine

Publications (2)

Publication Number Publication Date
GB202315163D0 GB202315163D0 (en) 2023-11-15
GB2620058A true GB2620058A (en) 2023-12-27

Family

ID=75396716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2315163.2A Pending GB2620058A (en) 2021-03-26 2021-03-26 A cylinder head for a lean-burn gasoline engine

Country Status (2)

Country Link
GB (1) GB2620058A (en)
WO (1) WO2022199842A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5522354A (en) * 1993-10-29 1996-06-04 Yamaha Hatsudoki Kabushiki Kaisha Valve mechanism for internal combustion engine
WO2009044225A1 (en) * 2007-10-03 2009-04-09 Kulygin, Viktor Ivanovych A method of mixing in a combustion chamber of an internal combustion engine and a spark-ignition direct-injection stratified fuel-air charge internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5522354A (en) * 1993-10-29 1996-06-04 Yamaha Hatsudoki Kabushiki Kaisha Valve mechanism for internal combustion engine
WO2009044225A1 (en) * 2007-10-03 2009-04-09 Kulygin, Viktor Ivanovych A method of mixing in a combustion chamber of an internal combustion engine and a spark-ignition direct-injection stratified fuel-air charge internal combustion engine

Also Published As

Publication number Publication date
WO2022199842A1 (en) 2022-09-29
GB202315163D0 (en) 2023-11-15

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