EP1046805A2 - Moteur à combustion interne - Google Patents

Moteur à combustion interne Download PDF

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Publication number
EP1046805A2
EP1046805A2 EP20000303319 EP00303319A EP1046805A2 EP 1046805 A2 EP1046805 A2 EP 1046805A2 EP 20000303319 EP20000303319 EP 20000303319 EP 00303319 A EP00303319 A EP 00303319A EP 1046805 A2 EP1046805 A2 EP 1046805A2
Authority
EP
European Patent Office
Prior art keywords
layer
internal combustion
thermally
thermally conducting
improving
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.)
Withdrawn
Application number
EP20000303319
Other languages
German (de)
English (en)
Other versions
EP1046805A3 (fr
Inventor
Robin Middlemass Howie
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1046805A2 publication Critical patent/EP1046805A2/fr
Publication of EP1046805A3 publication Critical patent/EP1046805A3/fr
Withdrawn legal-status Critical Current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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads

Definitions

  • This invention relates to internal combustion engines.
  • heat lost to the surfaces of the combustion chamber reduces the power output by both reducing the temperature of the fuel-air charge following combustion and by reducing the mass of fuel-air charge available for combustion. Heat lost to the surfaces of the combustion chamber increases the heat rejection load imposed on the engine cooling system.
  • a mechanically robust coating of low thermal mass can be obtained by covering the surfaces of interest with a thin layer of thermally resistant metal backed by a layer of thermal insulation between the thin metal layer and the surface being coated so that the metal layer is supported by the insulation and the insulation is protected against damage by the metal surface.
  • the metal layer can consist of thermally resistant metals such as nickel or chromium.
  • the insulation layer can consist of the ceramic material currently sprayed onto combustion chamber surfaces or of suitable minerals such as mica or pearlite powder. The thickness of the metal layer is minimised to reduce its thermal mass.
  • the metal layer is suitably bonded to the surface being coated to provide a robust protection to the thermal insulation below, the thickness of the metal is made small compared to the distance to any point of bonding to the underlying surface so that heat conduction along the metal coating is small compared with heat transfer between the metal surface and the underlying surface through the insulation layer.
  • Modified Piston Crown 10 is formed on Piston 11 in the form of a 0.5 mm thick layer of Mineral Insulation 12 covered by Cup 13 of a 0.2 mm thickness of a nickel/chromium high temperature alloy. Cup 13 is welded at Circumference 14 to a suitable alloy Ring 15 located in a slot in Piston 11 such as provided for Piston Rings 16 and 17. The outside diameter of welded Circumference 14 is slightly smaller than the outside diameter of Piston Rings 16 and 17 so that there is no contact between Cup 13 and the walls of the cylinder.
  • the thickness of the metal of Cup 13 is selected such that the Cup has sufficient physical strength when supported by Mineral Insulation 12 to withstand the detonation of the fuel-air charge in the cylinder and such that the overall thermal conduction from the upper surface of the Cup to Piston 11 is small compared with thermal conduction through Mineral Insulation 12. That is, overall heat transfer to Piston 11 is controlled by Mineral Insulation layer 12.
  • the reduced heat load on Piston 11 potentially enables the overall mass of the piston to be reduced thus improving engine fuel efficiency.

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)
  • Valve-Gear Or Valve Arrangements (AREA)
EP00303319A 1999-04-23 2000-04-19 Moteur à combustion interne Withdrawn EP1046805A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9909284 1999-04-23
GBGB9909284.3A GB9909284D0 (en) 1999-04-23 1999-04-23 An improved internal combustion engine design

Publications (2)

Publication Number Publication Date
EP1046805A2 true EP1046805A2 (fr) 2000-10-25
EP1046805A3 EP1046805A3 (fr) 2001-08-29

Family

ID=10852076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00303319A Withdrawn EP1046805A3 (fr) 1999-04-23 2000-04-19 Moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1046805A3 (fr)
GB (1) GB9909284D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1464821A1 (fr) * 2003-04-03 2004-10-06 Federal-Mogul Nürnberg GmbH Piston de moteur à combustion interne et méthode de production d'un piston

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658824U (ja) * 1993-01-30 1994-08-16 清 堀 フードとレバー付天ぷら鍋蓋

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU554140B2 (en) * 1980-07-02 1986-08-07 Dana Corporation Thermally insulating coating on piston head
JPH0689713B2 (ja) * 1987-10-22 1994-11-09 いすゞ自動車株式会社 断熱燃焼室の構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658824U (ja) * 1993-01-30 1994-08-16 清 堀 フードとレバー付天ぷら鍋蓋

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1464821A1 (fr) * 2003-04-03 2004-10-06 Federal-Mogul Nürnberg GmbH Piston de moteur à combustion interne et méthode de production d'un piston

Also Published As

Publication number Publication date
EP1046805A3 (fr) 2001-08-29
GB9909284D0 (en) 1999-06-16

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