DE1148813B - Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines - Google Patents

Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines

Info

Publication number
DE1148813B
DE1148813B DED32012A DED0032012A DE1148813B DE 1148813 B DE1148813 B DE 1148813B DE D32012 A DED32012 A DE D32012A DE D0032012 A DED0032012 A DE D0032012A DE 1148813 B DE1148813 B DE 1148813B
Authority
DE
Germany
Prior art keywords
piston
substances
mineral substances
mineral
internal combustion
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
DED32012A
Other languages
German (de)
Inventor
Dr-Ing Habil Herbert Maruhn
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DED32012A priority Critical patent/DE1148813B/en
Publication of DE1148813B publication Critical patent/DE1148813B/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
    • 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
    • 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
    • F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • 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
    • F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • F02B2023/0612—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material having a high temperature and pressure resistance, e.g. ceramic
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F7/0087—Ceramic materials
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Verfahren zur Anordnung einer wärmedämmenden Einlage bei Kolben für Brennkraftmaschinen Die Erfindung bezieht sich auf ein Verfahren zur Anordnung einer wärmedämmenden Einlage an bzw. in der den Brenngasen ausgesetzten Oberfläche von Brennkraftmaschinenkolben, insbesondere Leichtmetallkolben, unter Benutzung mineralischer, vorzugsweise keramischer Stoffe. Das Verfahren gemäß der Erfindung beschränkt sich ausdrücklich auf Kolben der genannten Art mit Brennraum; eine darüber hinausgehende Bedeutung hat es nicht.Method for arranging a heat-insulating insert for pistons for Internal combustion engines The invention relates to a method for arranging a insulating insert on or in the surface exposed to the combustion gases Internal combustion engine pistons, in particular light metal pistons, using mineral, preferably ceramic materials. The method according to the invention is limited expressly on pistons of the type mentioned with a combustion chamber; one going beyond that It doesn't matter.

Es besteht die Aufgabe, auf verhältnismäßig einfache Weise eine sehr gute Wärinedämmung zu erreichen, die für einen im Kolbenboden angeordneten offenen Brennraum eine ausreichend hohe Temperatur auch bei Teillast sichert und die eine zu starke Aufheizung der Ringpartie des Kolbens verhütet. Ferner soll eine innige Bindung der mineralischen Stoffe mit dem Werkstoff des Kolbens erreicht werden, wobei Wert darauf gelegt ist, daß sich die mineralischen Stoffe im. Werkstoff des Kolbens so verteilen, daß die wärmedämmende Wirkung nach der Tiefe zu abnimmt.The task is, in a relatively simple way, a very To achieve good thermal insulation, the open one arranged in the piston crown Combustion chamber ensures a sufficiently high temperature even at partial load and one Avoid excessive heating of the ring belt of the piston. Furthermore, an intimate Binding of the mineral substances with the material of the piston can be achieved, It is important that the mineral substances are in the. Material of the Distribute the piston so that the insulating effect decreases with depth.

Es ist bereits bekannt, nur den oberen Teil eines mit Brennraum ausgestatteten Kolbens aus gesinterten metallischen und keramischen Pulvern zu fertigen und den übrigen Kolbenteil aus normalem (also nicht gesintertem), gegossenem oder geschmiedetem Kolbenwerkstoff herzustellen. Diese Aufgabe hegt auch der Erfindung zugrunde, d. h., es soff vermieden werden, den gesamten Kolbenkörper aus Sintermetall herzustellen. Es soll ein Weg aufgezeigt werden, wie bei den weitaus häufiger verwendeten Kolben aus nicht gesintertem Metall der Wärmefluß zu den Kolbenringpartien vorteilhaft gedämmt weiden kann. - Bei dem vorstehend erwähnten, bekannten Kolben war ebenfalls dafür gesorgt, daß die Dichte der mineralischen Stoffe an oder in der Nähe der Oberfläche des Brennraumes größer als in der Tiefe des Kolbenbodens ist, jedoch ist hier der entsprechende, aus metallischem und keramischem Pulver zusammengesinterte Kolbenoberteil auf den eigentlichen, nicht pulvermetallischen Kolbenkörper nachträglich aufgesetzt. Demgegenüber kommt es bei der Erfindung darauf an, daß die mineralischen Partikeln unmittelbar im wirklichen Kolbenwerkstoff eingebettet sind, und zwar an bzw. nahe der Oberfläche des Brennraumes besonders dicht und nach der Tiefe in ihrer Dichte abnehmend.It is already known to manufacture only the upper part of a piston equipped with a combustion chamber from sintered metallic and ceramic powders and to manufacture the remaining piston part from normal (i.e. not sintered), cast or forged piston material. This object is also based on the invention, i. That is, it should be avoided to manufacture the entire piston body from sintered metal. The aim is to show a way in which the much more frequently used pistons made of non-sintered metal can advantageously insulate the heat flow to the piston ring sections. - In the case of the known piston mentioned above, it was also ensured that the density of the mineral substances on or near the surface of the combustion chamber is greater than in the depth of the piston crown, but here is the corresponding piston upper part sintered together from metallic and ceramic powder subsequently placed on the actual, non-powder-metallic piston body. In contrast, it is important in the invention that the mineral particles are embedded directly in the actual piston material, specifically on or near the surface of the combustion chamber, particularly densely and decreasing in density according to the depth.

Zur Lösung der aufgezeigten Aufgaben werden erfindungsgemäß die mineralischen Stoffe in Pulver- oder Grießforin in den durch Erhitzen teigig gemachten Kolbenboden des Kolbenrohlings derart eingeschossen, daß die Dichte der mineralischen Stoffe an oder in der Nähe, der Brennraumoberfläche größer ist als in der Tiefe des Kolbenbodens. Vorzugsweise wird hierfür ein mit einem Sandstrahlgebläse vergleichbares Strahlgebläse verwendet, welches mit erhitzter Druckluft arbeiten kann. An sich ist es bekannt, nüneralische Werkstoffe in Pulverform. auf ein durch Erhitzung teigig gemachtes Werkstück aufzuschießen. Wie je- doch schon gesagt, beschränkt sich die Erfindung auf den speziellen Fall eines Kolbens mit Brennraum.In order to achieve the stated problems, according to the invention the mineral substances in powder or semolina form are injected into the piston head of the piston blank, which has been made doughy by heating, in such a way that the density of the mineral substances on or near the combustion chamber surface is greater than in the depth of the piston head. For this purpose, a jet blower which is comparable to a sandblasting blower and which can work with heated compressed air is preferably used. It is known per se to use Nuernal materials in powder form. to shoot at a workpiece made doughy by heating. As JE already said, the invention is limited to the specific case of a piston combustion chamber.

Damit die Ringpartie des Kolbens am Kolbenschaft nach dem Einbetten der mineralischen Stoffe gegebenenfalls noch bearbeitet werden kann und damit die Gleiteigenschaften der Ringpartie nicht gestört werden, kann schließlich beim Einschießen der mineralischen Stoffe in den Kolbenboden ein von der Mantelfläche des Kolbens ausgehender Ringraum, beispielsweise durch ringförmiges Abdecken der Kolbenbodenoberfläche, frei von mineralischen Stoffen bleiben.So that the ring belt of the piston on the piston skirt after investing the mineral substances can possibly still be processed and thus the The sliding properties of the ring belt are not disturbed, after all, when shooting in of the mineral substances in the piston crown from the lateral surface of the piston outgoing annular space, for example by covering the piston crown surface in an annular manner, remain free of mineral substances.

In der Zeichnung ist ein nach dem Verfahren behandelter Kolben dargestellt.In the drawing, a piston treated according to the method is shown.

Der aus Leichtmetall bestehende Kolben 1 weist am Kolbenboden 2 den offenen Brennraum 3 auf. Um auch bei Teillast eine ausreichend hohe Temperatur der Wandung des Brennraumes 3 zu erreichen und um bei Vollast eine zu starke Aufheizung der Kolbenpartie 4 im Bereich der Kolbenringe 5 zu erzielen, sind in den durch Erhitzen teigig gemachten Kolbenboden 2 mineralische Stoffe 6, z. B. keramische Stoffe, in Pulver- oder Grießforin eingebettet worden. Die Verteilung der mineralischen Stoffe 6 im. Kolbenboden ist derart, daß viele, kleine Körnchen in der Nähe der Oberfläche des Kolbenbodens 2 und auch in der Wandung des Brennraumes 3 liegen, während weniger und größere Körnchen anschließend an das Feld der vielen kleinen Körnchen mehr nach der Tiefe zu angeordnet sind. Damit die Gleiteigenschaften der Kolbenpartie 7 über der Ringpartie 4 nicht beeinträchtigt werden und damit eine weitere Bearbeitung des Kolbens nach dem Einbetten der mineralischen Stoffe gut möglich ist, sind in der Kolbenpartie 7 keine mineralischen Stoffe eingebettet. Durch die dargestellte Art der Einbettung mineralischer Stoffe wird eine Wärmedämmung erzielt, deren Wirkung von der Oberfläche des Kolbenbodens und des Brennraumes nach der Tiefe zu allmählich abnimmt. Durch Wahl der Körnehengröße und die Art der Verteilung hat man es in der Hand, die Wirkung der Wärmedämmung zu beeinflussen und je nach Kolbenart bzw. Brennkraftmaschinenart dem Temperaturgefälle, ausgehend vom Brennraum 3, eine bestimmte Richtung zu geben. The piston 1 made of light metal has the open combustion chamber 3 on the piston crown 2. In order to achieve a sufficiently high temperature of the wall of the combustion chamber 3 even at partial load and to achieve excessive heating of the piston section 4 in the area of the piston rings 5 at full load, mineral substances 6, e.g. B. ceramic materials have been embedded in powder or semolina forin. The distribution of the mineral substances 6 in. The piston crown is such that many, small grains lie in the vicinity of the surface of the piston crown 2 and also in the wall of the combustion chamber 3 , while fewer and larger grains are arranged more towards the depth adjacent to the field of the many small grains. So that the sliding properties of the piston section 7 over the ring section 4 are not impaired and further processing of the piston is possible after the mineral substances have been embedded, no mineral substances are embedded in the piston section 7. The type of embedding of mineral substances shown here achieves thermal insulation, the effect of which gradually decreases from the surface of the piston crown and the combustion chamber downwards. By choosing the grain size and the type of distribution, it is possible to influence the effect of the thermal insulation and, depending on the type of piston or type of internal combustion engine, to give the temperature gradient a certain direction, starting from the combustion chamber 3.

Statt durch (vorzugsweise erhitzte) Druckluft die mineralischen Stoffe in der Art eines Sandstrahlgebläses in die teigige Oberfläche des Kolbenbodens einzubringen, ist -es auch möglich, die mineralischen Stoffe unter Benutzung elektrostatischer oder magnetischer Effekte in den Kelbenboden einzuschießen.Instead of using (preferably heated) compressed air, the mineral substances to be introduced into the doughy surface of the piston crown in the manner of a sandblasting blower, It is also possible to use electrostatic mineral substances or to shoot magnetic effects into the bottom of the goblet.

Claims (2)

PATENTANSPRÜCHE: 1. Verfahren zur Anordnung mineralischer, vorzugsweise kerarnischer Stoffe als wärmedämmende Einlagen in der den Brenngasen ausgesetzten Oberfläche eines einen Brennraum aufweisenden Brennkraftmaschinenkolbens, insbesondere eines Leichtmetallkolbens, dadurch gekennzeichnet, daß die mineralischen Stoffe in Pulver- oder Grießfonn in den durch Erhitzen teigig gemachten Kolbenboden des Kolbenrohlings derart eingeschlossen werden (z. B. mittels eines Heißluft-Strahlgebläses), daß in an sich bekannter Weise die Dichte der mineralischen Stoffe an oder in der Nähe der Brennraumoberfläche größer ist als in der Tiefe des Kolbenbodens. PATENT CLAIMS: 1. A method for the arrangement of mineral, preferably kerarnic substances as heat-insulating inserts in the surface of an internal combustion engine piston, particularly a light metal piston, which is exposed to the combustion gases, and in particular a light metal piston, characterized in that the mineral substances are in powder or semolina form in the piston head made doughy by heating of the piston blank are enclosed in such a way (e.g. by means of a hot air jet blower) that, in a manner known per se, the density of the mineral substances on or in the vicinity of the combustion chamber surface is greater than in the depth of the piston crown. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß beim Einschießen der nüneralischen Stoffe in den Kolbenboden ein von der Mantelfläche des Kolbens ausgehender Ringraum, z. B. durch ringförmiges Abdecken der Kolbenoberfläche, frei von mineralischen Stoffen gehalten wird. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 343 664, 725 761, 821903, 869 570; britische Patentschrift Nr. 203 338. 2. The method according to claim 1, characterized in that when shooting in the Nüneralischen substances in the piston head from the outer surface of the piston outgoing annular space, z. B. is kept free of mineral substances by covering the piston surface in an annular manner. Considered publications: German Patent Nos. 343 664, 725 761, 821903, 869 570; British Patent No. 203,338.
DED32012A 1959-12-01 1959-12-01 Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines Pending DE1148813B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED32012A DE1148813B (en) 1959-12-01 1959-12-01 Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED32012A DE1148813B (en) 1959-12-01 1959-12-01 Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines

Publications (1)

Publication Number Publication Date
DE1148813B true DE1148813B (en) 1963-05-16

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ID=7041142

Family Applications (1)

Application Number Title Priority Date Filing Date
DED32012A Pending DE1148813B (en) 1959-12-01 1959-12-01 Method for the arrangement of a heat-insulating insert in pistons for internal combustion engines

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Country Link
DE (1) DE1148813B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE343664C (en) * 1919-11-25 1921-11-05 Nikolaus Meurer Process for the production of cover layers made of enamel, glass, quartz, hard metal and the like produced by spraying onto heat-resistant workpieces. like
GB203338A (en) * 1922-08-30 1924-04-24 Charles Whipple Philip Improvements in pistons
DE725761C (en) * 1940-04-03 1942-09-29 Maschf Augsburg Nuernberg Ag Pistons, in particular light metal pistons for high-speed internal combustion engines
DE821903C (en) * 1950-08-12 1951-11-22 Karl Schoenbacher Dr Ing Method of manufacturing bearing shells
DE869570C (en) * 1948-10-01 1954-03-08 Maschf Augsburg Nuernberg Ag Pistons for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE343664C (en) * 1919-11-25 1921-11-05 Nikolaus Meurer Process for the production of cover layers made of enamel, glass, quartz, hard metal and the like produced by spraying onto heat-resistant workpieces. like
GB203338A (en) * 1922-08-30 1924-04-24 Charles Whipple Philip Improvements in pistons
DE725761C (en) * 1940-04-03 1942-09-29 Maschf Augsburg Nuernberg Ag Pistons, in particular light metal pistons for high-speed internal combustion engines
DE869570C (en) * 1948-10-01 1954-03-08 Maschf Augsburg Nuernberg Ag Pistons for internal combustion engines
DE821903C (en) * 1950-08-12 1951-11-22 Karl Schoenbacher Dr Ing Method of manufacturing bearing shells

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