DE2648392A1 - Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool - Google Patents

Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool

Info

Publication number
DE2648392A1
DE2648392A1 DE19762648392 DE2648392A DE2648392A1 DE 2648392 A1 DE2648392 A1 DE 2648392A1 DE 19762648392 DE19762648392 DE 19762648392 DE 2648392 A DE2648392 A DE 2648392A DE 2648392 A1 DE2648392 A1 DE 2648392A1
Authority
DE
Germany
Prior art keywords
piston
heat
piston crown
spaces
insulating chambers
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
DE19762648392
Other languages
German (de)
Inventor
Herbert Dipl Ing Deutschmann
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.)
MTU Aero Engines GmbH
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Muenchen GmbH
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 MTU Friedrichshafen GmbH, MTU Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Friedrichshafen GmbH
Priority to DE19762648392 priority Critical patent/DE2648392A1/en
Publication of DE2648392A1 publication Critical patent/DE2648392A1/en
Ceased 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
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The piston is made up of three separate parts and bolted together to form heat insulating chambers. The insulating chambers permit the piston crown to reach a high working temp. enabling the fuel to ignite at a low compression ratio. The piston crown surface (19) forming part of the insulating chambers (18) is coated with a heat absorbing substance to prevent heat radiation. The remaining insulating chamber surfaces (20) are heat reflective to throw back the heat to the piston crown. The piston ring bearer section (12) has an annular channel (20) only to cool the piston rings and fixing screws (14).

Description

MOTOREN- UND TURBIiISN-UMIONENGINE AND TURBIiISN UMION

FRIEDRICH3HAPEN GMBH 2 6 A 8 3 9 2FRIEDRICH3HAPEN GMBH 2 6 A 8 3 9 2

FriedrichshafenFriedrichshafen

Isolierter KolbenbodenInsulated piston crown

Die Erfindung betrifft einen Kolben für Brennkraftmaschinen mit einem von dem übrigen Kolben teilweise durch isolierende Zwischenräume getrennten Kolbenboden.The invention relates to a piston for internal combustion engines with a piston crown partially separated from the rest of the piston by insulating spaces.

Zweck der Erfindung ist die Ermöglichung und Verbesserung des Verbrennungsvorganges bei Brennkraftmaschinen mit niedrigem Verdichtungsverhältnis.The purpose of the invention is to enable and improve of the combustion process in internal combustion engines with a low compression ratio.

Es sind derartige Kolben für Brennkraftmaschinen bekannt geworden, bei denen der Kolbenboden im Betrieb durch die isolierenden Zwischenräume eine hohe Temperatur erreicht und damit eine Entzündung des Kraftstoffes auch bei niedrigem Verdichtungsverhältnis zuläßt.Such pistons for internal combustion engines are known in which the piston crown reaches a high temperature during operation due to the insulating spaces and thus allows the fuel to ignite even at a low compression ratio.

Aufgabe der Erfindung ist es, diese Wirkung des isolierenden Zwischenraumes zu verbessern und damit eine weitere Reduzierung des Verdichtungsverhältnisses zu ermöglichen.The object of the invention is to improve this effect of the insulating space and thus a further reduction to enable the compression ratio.

Diese Aufgabe wird dadurch gelöst, daß die die Zwischenräume begrenzende Wand des Kolbenbodens mit einem wärmeabsorbierenden Belag versehen ist und daß die übrigen Wände der Zwischenräume eine die Wärmestrahlung des Koloenbodens reflektierende Oberfläche aufweisen.This object is achieved in that the wall of the piston head which delimits the spaces is covered with a heat-absorbing one Covering is provided and that the other walls of the interstices a the heat radiation of the Koloenbodens have reflective surface.

Dadurch ist mit verhältnismäßig geringem Aufwand eine weitere Verbesserung der Isolationswirkung der ZwischenräumeThis makes another one with relatively little effort Improvement of the isolation effect of the interstices

22.10.1976 809817/0514 7654 10/22/1976 809817/0514 7654

gm-segm-se

und damit eine weitere Temperatursteigerung des Kolbenbodens zu erreichen. Der Kraftstoff kann sich trotz weiterer Verdichtungsabsenkung an dem heißen Kolbenboden entzünden.and thus a further increase in the temperature of the piston crown to reach. The fuel can settle on the hot piston crown in spite of a further reduction in compression ignite.

Mit den Merkmalen des zweiten Anspruches kann die wärmeabsorbierende Wirkung der Kolbenbodenschicht verbessert werden, ohne daß die Abstrahlungsenergie dabei wesentlich zunimmt.With the features of the second claim, the heat-absorbing Effect of the piston crown layer can be improved without the radiation energy being significantly increases.

Im dritten Anspruch sind konstruktive Einzelheiten angeführt, nach denen der Kolben in einfacher Weise aufgebaut werden kann, wobei das Aufbringen der Beläge und das Behandeln der Oberflächen keine Schwierigkeiten bereitet.In the third claim, structural details are given, according to which the piston can be built up in a simple manner, with the application of the coverings and the treatment the surfaces does not cause any problems.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below.

Der Kolben mit den Erfindungsmerkmalen besteht im wesentlichen aus einem Kolbenboden 11, einem Ringträger 12 und einem Kolbenhemd 13« Diese drei Teile werden durch Schrauben 14 untereinander verbunden. Im Kolbenboden 11 ist eine Brennraummulde I5 angeordnet, der Ringträger 12 besitzt Nuten 16 für die Kolbenringe, zwischen dem Kolbenhemd 1j5 und dem Ringträger 12 ist eine Nut I7 für einen ölabstreifring vorgesehen.The piston with the features of the invention consists essentially of a piston head 11, a ring carrier 12 and a piston skirt 13 «These three parts are screwed together 14 connected to each other. In the piston head 11 is a Combustion bowl I5 arranged, the ring carrier 12 has Grooves 16 for the piston rings, between the piston skirt 1j5 and the ring carrier 12 is a groove I7 for an oil control ring intended.

Zwischen dem Kolbenboden 11, dem Ringträger 12 und dem Kolbenhemd 13 sind durch entsprechende Aussparungen Zwischenräume 18 gebildet, die den Kolbenboden gegenüber den übrigen Kolbenteilen isolieren. Die die Zwischenräume begrenzendeBetween the piston head 11, the ring carrier 12 and the piston skirt 13 are spaces through corresponding recesses 18 formed, which the piston crown compared to the rest Isolate piston parts. The one that delimits the gaps

22.10.1976 809817/0514 765^ 10/22/1976 809817/0514 765 ^

gm-segm-se

Wand 19 des Kolbenbodens ist mit einem wärmeabsorbierenden Belag versehen, der zur Vermeidung von Wärmeabstrahlung mit einer dentritischen Oberfläche ausgebildet sein kann. Die übrigen Wände 20 der Zwischenräume weisen eine reflektierende Oberfläche auf und bewirken dadurch eine Rückspiegelung der vom Kolben ausgehenden Wärmestrahlung.Wall 19 of the piston head is covered with a heat-absorbing Provided covering, which can be designed to avoid heat radiation with a dendritic surface. The remaining walls 20 of the spaces have a reflective surface and thereby cause a back reflection the heat radiation emanating from the piston.

Im Ringträger 12 ist ein ringförmiger Kanal 21 für das Kolbenkühlöl so angeordnet, daß nur die Kolbenringe und die Schrauben 14 gekühlt werden.In the ring carrier 12, an annular channel 21 for the piston cooling oil is arranged so that only the piston rings and the screws 14 are cooled.

22.10.1976 7 6 510/22/1976 7 6 5

809817/0514809817/0514

Claims (1)

PatentansprücheClaims ;ij Kolben für Brennkraftmaschinen mit einem von dem übrigen Kolben teilweise durch isolierende Zwischenräume getrennten Kolbenboden, dadurch gekennzeichnet, daß die die Zwischenräume (18) begrenzende Wand des Kolbenf3 bodens mit einem wärmeabsorbierenden Belag (19) versehen ist und daß die übrigen Wände der Zwischenräume eine die Wärmestrahlung des Kolbenbodens reflektierende Oberfläche (20) aufweisen.; ij pistons for internal combustion engines with one of the rest Pistons partially separated by insulating spaces, characterized in that the wall of the piston f3 which delimits the spaces (18) bottom is provided with a heat-absorbing coating (19) and that the other walls of the spaces a surface reflecting the thermal radiation of the piston crown (20) have. 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß der wärmeabsorbierende Belag des Kolbenbodens eine dentritische Oberfläche aufweist.2. Piston according to claim 1, characterized in that the heat-absorbing coating of the piston head is dendritic Has surface. j5. Kolben nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Kolben einen aus hochtemperaturbeständigem Material mit schlechter Wärmeleitfähigkeit bestehenden Kolbenboden (11), einen Ringträger (12) aus Stahl und ein Kolbenhemd (13) aus Leichtmetall aufweist, die untereinander mit Schrauben (14) verbunden sind, daß die Zwischenräume aus dem Kolbenboden einerseits und dem Ringträger und dem Kolbenhemd andererseits gebildet werden und daß im Ringträger ein ringförmiger Kanal (21) für das Kolbenkühlöl so angeordnet ist, daß nur die Kolbenringe und die Schrauben (14) gekühlt werden.j5. Piston according to claims 1 and 2, characterized in that that the piston is made of a material that is resistant to high temperatures and has poor thermal conductivity Piston head (11), a ring carrier (12) made of steel and a piston skirt (13) made of light metal, which one below the other are connected with screws (14) that the spaces between the piston head on the one hand and the ring carrier and the piston skirt on the other hand are formed and that in the ring carrier an annular channel (21) for the piston cooling oil is arranged so that only the piston rings and the screws (14) are cooled. 22.10.197610/22/1976 gm-se 809817/0514gm-se 809817/0514
DE19762648392 1976-10-26 1976-10-26 Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool Ceased DE2648392A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762648392 DE2648392A1 (en) 1976-10-26 1976-10-26 Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762648392 DE2648392A1 (en) 1976-10-26 1976-10-26 Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool

Publications (1)

Publication Number Publication Date
DE2648392A1 true DE2648392A1 (en) 1978-04-27

Family

ID=5991409

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762648392 Ceased DE2648392A1 (en) 1976-10-26 1976-10-26 Heat insulated piston crown - has heat insulating chambers with heat reflective surfaces to keep rings and bore cool

Country Status (1)

Country Link
DE (1) DE2648392A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442336A1 (en) * 1978-11-24 1980-06-20 Townsend Engineering Co IC engine piston seal protection system - uses thin layer of air introduced between piston and cylinder liner
DE2936630A1 (en) * 1979-09-11 1981-03-26 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 88045 Friedrichshafen IC engine bolted construction piston - has crown plate with rounded or conical face bearing against piston body
EP0027782A1 (en) * 1979-08-30 1981-04-29 Conort Engineering Ab Process for achieving stoichiometric combustion in two-stroke Otto engines, and system therefor
EP0049006A1 (en) * 1980-09-30 1982-04-07 KOLBENSCHMIDT Aktiengesellschaft Compound piston
DE3426238A1 (en) * 1984-07-17 1986-01-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen BUILT PISTON
US5724933A (en) * 1995-03-09 1998-03-10 Wartsila Diesel International Ltd Oy Piston unit for an internal combustion engine
WO2009049604A2 (en) * 2007-10-20 2009-04-23 Mahle International Gmbh Piston for an internal combustion engine
WO2009049611A1 (en) * 2007-10-20 2009-04-23 Mahle International Gmbh Piston for an internal combustion engine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442336A1 (en) * 1978-11-24 1980-06-20 Townsend Engineering Co IC engine piston seal protection system - uses thin layer of air introduced between piston and cylinder liner
EP0027782A1 (en) * 1979-08-30 1981-04-29 Conort Engineering Ab Process for achieving stoichiometric combustion in two-stroke Otto engines, and system therefor
DE2936630A1 (en) * 1979-09-11 1981-03-26 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 88045 Friedrichshafen IC engine bolted construction piston - has crown plate with rounded or conical face bearing against piston body
EP0049006A1 (en) * 1980-09-30 1982-04-07 KOLBENSCHMIDT Aktiengesellschaft Compound piston
DE3426238A1 (en) * 1984-07-17 1986-01-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen BUILT PISTON
US5724933A (en) * 1995-03-09 1998-03-10 Wartsila Diesel International Ltd Oy Piston unit for an internal combustion engine
US5975040A (en) * 1995-03-09 1999-11-02 Wartsila Diesel International Oy Piston unit for an internal combustion engine
WO2009049604A2 (en) * 2007-10-20 2009-04-23 Mahle International Gmbh Piston for an internal combustion engine
WO2009049611A1 (en) * 2007-10-20 2009-04-23 Mahle International Gmbh Piston for an internal combustion engine
WO2009049604A3 (en) * 2007-10-20 2009-07-02 Mahle Int Gmbh Piston for an internal combustion engine
US8714129B2 (en) 2007-10-20 2014-05-06 Mahle International Gmbh Piston for an internal combustion engine

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Legal Events

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OGA New person/name/address of the applicant
8110 Request for examination paragraph 44
8131 Rejection