EP0027782A1 - Verfahren zum Erzielen einer stöchiometrischen Verbrennung in Zweitakt-Otto-Motoren und System hierfür - Google Patents

Verfahren zum Erzielen einer stöchiometrischen Verbrennung in Zweitakt-Otto-Motoren und System hierfür Download PDF

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Publication number
EP0027782A1
EP0027782A1 EP80850126A EP80850126A EP0027782A1 EP 0027782 A1 EP0027782 A1 EP 0027782A1 EP 80850126 A EP80850126 A EP 80850126A EP 80850126 A EP80850126 A EP 80850126A EP 0027782 A1 EP0027782 A1 EP 0027782A1
Authority
EP
European Patent Office
Prior art keywords
coating
piston
stoichiometric combustion
stroke otto
coefficient
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Withdrawn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
EP80850126A
Other languages
English (en)
French (fr)
Inventor
Olof Wallander
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.)
CONORT ENGINEERING AB
Original Assignee
CONORT ENGINEERING AB
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 CONORT ENGINEERING AB filed Critical CONORT ENGINEERING AB
Publication of EP0027782A1 publication Critical patent/EP0027782A1/de
Withdrawn legal-status Critical Current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
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • This invention generically refers to the combustion motor art and the invention is particularly concerned with a novel and original method for obtaining stoichiometric combustion and thereby permitting fuel consumption to be lowered and the exhaust gas quality to be improved in two-stroke Otto motors of the high-efficiency type.
  • a method of additionally increasing this temperature subsequent to achieving stoichiometric combustion conditions comprises insulating the combustion space walls by various means thereby to reduce heat discharge.
  • the deleterious shear strains are minimized by causing the plasma-sprayed layer of material, preferably metal, having a temperature expansion coefficient comparable to the piston material, continously to merge into the insulating, preferably ceramic layer without any distinct boundary.
  • this can be achieved in several ways, for example with the aid of double powder feeders which at a defined total flow operate under a phase-shift from 100 per cent of the one material to 100 per cent of the other material.
  • the shear strain is minimized by spraying the material so thinly that the most recently sprayed material only forms small islands on the previously deposited material. In this case the shear tension is not summed-up between the islands as is the case within the islands or within a more homogeneous layer. In practice,this can be achieved for example by holding the lateral feed velocity during the coating operation at a sufficiently high value.
  • piston top portion 2 in the normal way is provided with a groove 3 adapted to receive a piston ring.
  • the upper surface of the piston top 2 is suitably provided with a depression in which a coating 4, 5, 6 according to the invention is received.
  • the coating operation is suitably performed by so-called plasma spraying which is a coating method well known within this technical field. Said plasma spraying is performed during relative translational movement between the plasma spray gun and the piston. In accordance with this invention this plasma spraying during the coating operation is to be performed with a translational velocity chosen so that during every passage only partial surface coverage is obtained. Hereby the formation of completely covering layers with consequential risk for separation is avoided, islands or "patches" being obtained by proper adaptation of the translational velocity in accordance with the invention.
  • the piston end faces during the coating operation are initially provided with a coating 4 adjacent the piston top 2, said first coating 4 comprising a metallic material having a coefficient of extension comparable to that of the piston material.
  • the process subsequently comprises a continuous transition into an insulating coating 6, preferably of ceramic type. This can be obtained in many different ways, for example by using double powder feeders which under defined total flows operate at a phase shift from 100 per cent of the metallic coating material to 100 per cent of the ceramic insulating coating.
  • an intermediate layer 5 is formed in which adjacent the piston top the metallic material 4 dominates whereas the ceramic insulating material is the dominating component farther outwardly towards the insulating ceramic coating.
  • the invention also comprises a piston having a piston top provided with a coating applied in accordance with the process of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP80850126A 1979-08-30 1980-08-27 Verfahren zum Erzielen einer stöchiometrischen Verbrennung in Zweitakt-Otto-Motoren und System hierfür Withdrawn EP0027782A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7907229A SE7907229L (sv) 1979-08-30 1979-08-30 Metod att uppna stokiometrisk forbrenning for tva-takts ottomotorer av hogeffektstyp
SE7907229 1979-08-30

Publications (1)

Publication Number Publication Date
EP0027782A1 true EP0027782A1 (de) 1981-04-29

Family

ID=20338722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80850126A Withdrawn EP0027782A1 (de) 1979-08-30 1980-08-27 Verfahren zum Erzielen einer stöchiometrischen Verbrennung in Zweitakt-Otto-Motoren und System hierfür

Country Status (3)

Country Link
EP (1) EP0027782A1 (de)
JP (1) JPS5656952A (de)
SE (1) SE7907229L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4791896A (en) * 1982-07-29 1988-12-20 Howard Bidwell Water cooled scavenged crankcase type Otto internal combustion engine
US4798770A (en) * 1981-09-24 1989-01-17 Toyota Jidosha Kabushiki Kaisha Heat resisting and insulating light alloy articles and method of manufacture
AT399917B (de) * 1983-07-06 1995-08-25 Avl Verbrennungskraft Messtech Dieselmotor mit direkter kraftstoffeinspritzung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722835C (de) * 1938-08-20 1942-07-22 Bernhard Berghaus Leichtmetallkolben fuer Brennkraftmaschinen
US2657961A (en) * 1950-03-15 1953-11-03 Maschf Augsburg Nuernberg Ag Piston for internal-combustion engines
DE943917C (de) * 1944-09-10 1956-06-01 Dr Joseph Dornauf Mit einer waermeisolierenden Schicht abgedeckter Kolbenboden
FR1460183A (fr) * 1965-11-18 1966-11-25 Piston
US3911891A (en) * 1973-08-13 1975-10-14 Robert D Dowell Coating for metal surfaces and method for application
DE2648034A1 (de) * 1976-10-23 1978-04-27 Schmidt Gmbh Karl Brennkraftmaschine
DE2648392A1 (de) * 1976-10-26 1978-04-27 Motoren Turbinen Union Isolierter kolbenboden
DE2729218A1 (de) * 1977-06-29 1979-01-04 Daimler Benz Ag Brennkraftmaschine
DE2729230A1 (de) * 1977-06-29 1979-01-11 Daimler Benz Ag Brennkraftmaschine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722835C (de) * 1938-08-20 1942-07-22 Bernhard Berghaus Leichtmetallkolben fuer Brennkraftmaschinen
DE943917C (de) * 1944-09-10 1956-06-01 Dr Joseph Dornauf Mit einer waermeisolierenden Schicht abgedeckter Kolbenboden
US2657961A (en) * 1950-03-15 1953-11-03 Maschf Augsburg Nuernberg Ag Piston for internal-combustion engines
FR1460183A (fr) * 1965-11-18 1966-11-25 Piston
US3911891A (en) * 1973-08-13 1975-10-14 Robert D Dowell Coating for metal surfaces and method for application
DE2648034A1 (de) * 1976-10-23 1978-04-27 Schmidt Gmbh Karl Brennkraftmaschine
DE2648392A1 (de) * 1976-10-26 1978-04-27 Motoren Turbinen Union Isolierter kolbenboden
DE2729218A1 (de) * 1977-06-29 1979-01-04 Daimler Benz Ag Brennkraftmaschine
DE2729230A1 (de) * 1977-06-29 1979-01-11 Daimler Benz Ag Brennkraftmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798770A (en) * 1981-09-24 1989-01-17 Toyota Jidosha Kabushiki Kaisha Heat resisting and insulating light alloy articles and method of manufacture
US4791896A (en) * 1982-07-29 1988-12-20 Howard Bidwell Water cooled scavenged crankcase type Otto internal combustion engine
AT399917B (de) * 1983-07-06 1995-08-25 Avl Verbrennungskraft Messtech Dieselmotor mit direkter kraftstoffeinspritzung

Also Published As

Publication number Publication date
SE7907229L (sv) 1981-03-01
JPS5656952A (en) 1981-05-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19820401

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WALLANDER, OLOF