EP0000592A1 - Cooled piston for an internal-combustion engine and method for producing same - Google Patents

Cooled piston for an internal-combustion engine and method for producing same Download PDF

Info

Publication number
EP0000592A1
EP0000592A1 EP78200004A EP78200004A EP0000592A1 EP 0000592 A1 EP0000592 A1 EP 0000592A1 EP 78200004 A EP78200004 A EP 78200004A EP 78200004 A EP78200004 A EP 78200004A EP 0000592 A1 EP0000592 A1 EP 0000592A1
Authority
EP
European Patent Office
Prior art keywords
piston
combustion engine
internal combustion
piston according
engine piston
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.)
Granted
Application number
EP78200004A
Other languages
German (de)
French (fr)
Other versions
EP0000592B1 (en
Inventor
Horst Dr. Moebus
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.)
Karl Schmidt GmbH
Original Assignee
Karl Schmidt 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6013111&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0000592(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Karl Schmidt GmbH filed Critical Karl Schmidt GmbH
Publication of EP0000592A1 publication Critical patent/EP0000592A1/en
Application granted granted Critical
Publication of EP0000592B1 publication Critical patent/EP0000592B1/en
Expired legal-status Critical Current

Links

Images

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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/10—Low-tension installation, e.g. using surface-discharge sparking plugs
    • 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
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • 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

Definitions

  • the invention relates to a cooled, completely or partially made of an iron plastic internal combustion engine piston, in particular for diesel engines, with a cooling channel which is circular in the piston head behind the ring section, at least in the region of the first ring groove, in which the free-hanging pin bosses by ribs with the inside of the piston crown and the Piston shaft connected and openings are arranged in the piston shaft opposite the bolt eyes, the cooling channel being connected to the coolant circulation system via corresponding coolant inlet and outlet lines running essentially parallel to the longitudinal axis of the piston and a method for its production.
  • spheroidal graphite cast iron Since spheroidal graphite cast iron has excellent mechanical and technological properties, good machinability and high wear resistance in the hardened state, and also has the same flowability and castability as gray cast iron, pistons made of this material have recently been used for highly-charged modern internal combustion engines, in particular Diesel engines can enforce.
  • the maximum permissible temperature of the piston crown of such pistons is approximately 500 ° C.
  • Such a one-piece cast internal combustion engine piston is described, for example, in DE-OS 21 06 923, in which the freely suspended pin hubs are connected to the piston crown and the piston skirt by ribs.
  • the production of such a one-piece piston requires a very considerable amount of effort in the foundry, since the piston only requires the use of a multi-part core, the individual parts of which, for example manufactured according to the form mask process and glued together to form the core, can be cast. This creates core offsets and thus inaccuracies that can lead to rejects in the required dimensional and weight tolerances.
  • the object of the present invention is to design the internal combustion engine piston of the type described at the outset in such a way that it can be produced by gravity die casting or the conventional sand casting process, largely avoiding complicated cores or from forged or rolled primary material.
  • the piston consists of several parts which are firmly connected to one another in the region of the parting planes via intermetallic intermediate layers.
  • the piston preferably consists of at least one upper and one lower part.
  • the parting plane runs at the level of the cooling channel. This enables mechanical processing of the cooling channel, which reduces the notch stresses in the cooling channel surface and allows easy checking of the cavities before assembly.
  • the parting planes are separated in at least two stages so that simple centering is possible and / or the parting plane can be placed in low-stress zones.
  • At least one of the parts of the piston is made of spheroidal graphite cast iron, steel, beryllium bronze or a heat-resistant alloy such as stellite or nimonic. Of course, these materials can also be combined with each other.
  • the individual parts of the piston are connected to one another via intermediate layers consisting of copper, copper alloys, silver or silver alloys.
  • the internal combustion engine piston designed according to the invention is manufactured in such a way that all separately manufactured parts of the piston are put together with metal foils and a temperature of 900 to 1200 ° C, preferably 1100 ° C, for a time of 2 to 30 minutes, preferably 5 to 15 Minutes. Due to the furnace soldering, the solder diffuses into the outer areas of the contact surfaces of the piston materials and creates a firm connection.
  • the one out Cast iron with spheroidal graphite with forced cooling has free-hanging pin bosses 1, which are connected to the underside of the piston head 3 via the ribs 2 and to the piston skirt 5 via the ribs 4.
  • openings 7 are arranged opposite the bolt eye.
  • annular cooling duct 8 which communicates with the corres. Via removal or dispensing channels arranged in the rib 2. Bonding take-off 9 and discharge openings 10 for the supply and discharge of the cooling channel is connected to the pin bosses 1.
  • the upper part of the piston consisting of the top land 11 and the first annular groove 12 and the lower part of the piston formed from the piston skirt 5 and the annular grooves 13, 14, 15 are produced separately from one another and brazed to one another via an intermediate copper layer 16 of 0.1 mm thickness.
  • the parting line runs in a graduated form at the level of the cooling channel.
  • FIG. 2 shows a further example of the internal combustion engine piston comprising three parts according to the invention with spray cooling and combustion chamber trough.
  • the parts 17, 18, 20, which consist of different materials, are partially connected to one another by means of charge carrier jets and partially soldered to one another.
  • the upper part 17 made of a heat-resistant forged material is welded to the middle part 18 made of spheroidal graphite cast iron via the parting plane 19 by means of charge carrier blasting.
  • the middle part 18 is supported on the lower part 20 cast from spheroidal graphite cast iron, which is connected to the intermediate part 18 by an intermetallic intermediate layer running in the separated parting plane 21.
  • the parting plane 21 between the middle part 18 and the lower part 20 is arranged such that the one attached in the upper and middle part Cooling channel 22 receives a simple geometric shape, which can be produced with simple tools and the least effort.
  • the vertical ribs 23 and the horizontal ribs 24 connected to the bolt eye 25 are arranged in the lower part 20. The coolant is supplied or removed via the channels 26, 27 cast into the ribs 23.
  • pistons of the type mentioned in the introduction can be manufactured in a comparatively simple manner.

Landscapes

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

Abstract

1. A cooled piston for internal combustion engines, particularly for diesel engines, which consists entirely or in part of ferrous material and is formed in the piston head (3) behind the ring portion with a cooling passage (8, 22), which forms a continuous peripheral ring at least adjacent to the uppermost ring groove (12), which piston comprises freely suspended piston pin bosses (1), which are connected by ribs (2, 4, 23, 24) to the inside surface of the piston head and to the piston skirt (5), which is formed with apertures (7) in registry with the openings of the piston pin bosses (6), the cooling passage being connected to the coolant-circulating system by suitable coolant supply and drain conduits (9, 10, 26, 27), which extend substantially parallel to the piston axis, characterized in that the piston consists of a plurality of parts (3, 5, 17, 18, 20), which are firmly joined by an intermetallic interlayer at the interfacial planes (16, 19, 21).

Description

Die Erfindung betrifft einen gekühlten, ganz oder teilweise aus einem Eisenweikstoff bestehenden Brennkraftmaschinenkolben, insbesondere für Dieselmotoren, mit einem im Kolbenkopf hinter der Ringpartie wenigstens im Bereich der ersten Ringnute ringförmig umlaufenden Kühlkanal, bei dem die freihängenden Bolzennaben durch Rippen mit der Innenseite des Kolbenbodens und dem Kolbenschaft verbunden und im Kolbenschaft gegenüber den Bolzenaugen Durchbrechungen angeordnet sind, wobei der Kühlkanal über entsprechende, im wesentlichen parallel zur Kolben- längsachse verlaufende Kühlmittelzu- bzw. -ablaufleitungen mit dem Kühlmittelumlaufsystem verbunden ist und ein Verfahren zu seiner Herstellung.The invention relates to a cooled, completely or partially made of an iron plastic internal combustion engine piston, in particular for diesel engines, with a cooling channel which is circular in the piston head behind the ring section, at least in the region of the first ring groove, in which the free-hanging pin bosses by ribs with the inside of the piston crown and the Piston shaft connected and openings are arranged in the piston shaft opposite the bolt eyes, the cooling channel being connected to the coolant circulation system via corresponding coolant inlet and outlet lines running essentially parallel to the longitudinal axis of the piston and a method for its production.

Da Gußeisen mit Kugelgraphit ausgezeichnete mechanische und technologische Eigenschaften sowie eine gute Bearbeitbarkeit und im gehärteten Zustand einen hohen Verschleißwiderstand aufweist, außerdem eine gleich gute Fließfähigkeit sowie eine Vergießbarkeit wie Grauguß besitzt, haben sich in neuerer Zeit aus diesem Werkstoff bestehende Kolben für hochaufgeladene moderne Brennkraftmaschinen, insbesondere Dieselmotoren, durchsetzen können. Die maximal zulässige Temperatur des , Kolbenbodens solcher Kolben beträgt ca. 500°C.Since spheroidal graphite cast iron has excellent mechanical and technological properties, good machinability and high wear resistance in the hardened state, and also has the same flowability and castability as gray cast iron, pistons made of this material have recently been used for highly-charged modern internal combustion engines, in particular Diesel engines can enforce. The maximum permissible temperature of the piston crown of such pistons is approximately 500 ° C.

Die Temperaturen am Feuersteg sowie insbesondere in der ersten Ringnute sind dementsprechend hcch, so daß bei nicht zwangsgekühlten Kolben schon bei relativ niedrigem Mitteldruck die Gefahr des Festbrennens der Kolbenringe, vorzugsweise-des ersten Kolbenrings, besteht. Aus diesem Grunde kommen Kolben aus Gußeisen mit Kugelgraphit für hochaufgeladene moderne Brennkraftmaschinen nur dann in Frage, wenn sie sehr intensiv kühlbar sind. Die intensivste Kühlung läßt sich-mit im Kolbenkopf eingegossenen Kühlkanälen erzielen, die von einem zwangsgeführten, Kühlmittel durchflossen werden. Die Zufuhr des Kühlmittels erfolgt in der Regel über das System Kurbelwelle und Pleuelstange oder über gehäusefeste Spritzdüsen.The temperatures at the top land and in particular in the first ring groove are accordingly high, so that in the case of pistons which are not positively cooled, the risk of the piston rings, preferably the first piston ring, sticking even at a relatively low mean pressure. For this reason, pistons made of cast iron with spheroidal graphite are only suitable for highly charged modern internal combustion engines if they can be cooled very intensively. The most intensive cooling can be achieved with cooling channels cast into the piston head, through which a positively guided coolant flows. The coolant is usually supplied via the crankshaft and connecting rod system or via spray nozzles fixed to the housing.

Ein solcher einteilig gegossener Brennkraftmaschinenkolben ist beispielsweise in der DE-OS 21 06 923 beschrieben, bei dem die freihängenden Bolzennaben durch Rippen mit dem Kolbenboden und dem Kolbenschaft verbunden sind. Die Herstellung eines solchen einteiligen Kolbens bedarf allerdings eines ganz beachtlichen Aufwands in der Gießerei, da der Kolben nur unter Verwendung eines mehrteiligen Kerns, dessen Einzelteile beispielsweise nach dem Formmaskenverfahren hergestellt und zum Kern zusammengeklebt sind, gegossen werden kann. Dadurch entstehen Kernversätze und damit Ungenauigkeiten, die bei den geforderten Maß- und Gewichtstoleranzen zu Ausschuß führen können.Such a one-piece cast internal combustion engine piston is described, for example, in DE-OS 21 06 923, in which the freely suspended pin hubs are connected to the piston crown and the piston skirt by ribs. The production of such a one-piece piston, however, requires a very considerable amount of effort in the foundry, since the piston only requires the use of a multi-part core, the individual parts of which, for example manufactured according to the form mask process and glued together to form the core, can be cast. This creates core offsets and thus inaccuracies that can lead to rejects in the required dimensional and weight tolerances.

Aufgabe der vorliegenden Erfindung ist es, den Brennkraftmaschinenkolben der eingangs beschriebenen Bauart so auszubilden, daß dieser im Kokillenguß- oder im üblichen Sandgußverfahren unter weitgehender Vermeidung von komplizierten Kernen bzw. aus geschmiedetem oder gewalztem Vormaterial gefertigt werden kann.The object of the present invention is to design the internal combustion engine piston of the type described at the outset in such a way that it can be produced by gravity die casting or the conventional sand casting process, largely avoiding complicated cores or from forged or rolled primary material.

Die Lösung dieser Aufgabe besteht erfindungsgemäß darin, daß der Kolben aus mehreren Teilen besteht, die im Bereich der Trennebenen über intermetallische Zwischenschichten fest miteinander verbunden sind. Vorzugsweise besteht der Kolben wenigstens aus einem Ober- und einem Unterteil.This object is achieved according to the invention in that the piston consists of several parts which are firmly connected to one another in the region of the parting planes via intermetallic intermediate layers. The piston preferably consists of at least one upper and one lower part.

Nach einem weiteren Erfindungsmerkmal verläuft die Trennebene in Höhe des Kühlkanals. Dadurch wird eine mechanische Bearbeitung des Kühlkanals ermöglicht, welche die Kerbspannungen in der Kühlkanaloberfläche herabsetzt und eine einfache Kontrolle der Hohlräume vor dem Zusammenfügen erlaubt.According to a further feature of the invention, the parting plane runs at the level of the cooling channel. This enables mechanical processing of the cooling channel, which reduces the notch stresses in the cooling channel surface and allows easy checking of the cavities before assembly.

Die Trennebenen sind in mindestens zwei Stufen abgesetzt, damit eine einfache Zentrierung möglich ist und/oder die Trennebene in spannungsarme Zonen gelegt werden kann.The parting planes are separated in at least two stages so that simple centering is possible and / or the parting plane can be placed in low-stress zones.

Es ist auch möglich, die Trennebenen geneigt zur Horizontalen oder parallel zur Kclbenlängsachse verlaufend anzuordnen.It is also possible to arrange the parting planes inclined to the horizontal or parallel to the longitudinal axis of the cylinder.

Wenigstens eines der Teile des Kolbens besteht aus Gußeisen mit Kugelgraphit, Stahl, Beryllium-Bronze oder einer warmfesten Legierung wie Stellit oder Nimonic. Diese Werkstoffe können selbstverständlich auch mit- einander kombiniert werden.At least one of the parts of the piston is made of spheroidal graphite cast iron, steel, beryllium bronze or a heat-resistant alloy such as stellite or nimonic. Of course, these materials can also be combined with each other.

Treten in Sonderfällen bei stark hinterschnittenen Kolbenbrennräumen höhere Spitzentemperaturen auf, dann werden in der erfindungsgemäßen Ausführung hochwarmfeste, gut wärmeleitende und duktile Werkstoffe für das Oberteil verwendet, während darunterliegende Teile weiterhin aus Gußeisen mit Kugelgraphit bestehen.If higher peak temperatures occur in special cases with strongly undercut piston combustion chambers, then high-temperature-resistant, good heat-conducting and ductile materials are used for the upper part in the embodiment according to the invention, while underlying parts continue to consist of spheroidal graphite cast iron.

Im Rahmen der Ausgestaltung der Erfindung sind die einzelnen Teile des Kolbens über aus Kupfer, Kupferlegierungen, Silber oder Silberlegierungen bestehende Zwischenschichten miteinander verbunden.In the context of the embodiment of the invention, the individual parts of the piston are connected to one another via intermediate layers consisting of copper, copper alloys, silver or silver alloys.

Der erfindungsgemäß gestaltete Brennkraftmaschinenkolben wird in der Weise hergestellt, daß alle getrennt gefertigten Teile des Kolbens unter Einlegen von Metallfolien zusammengesetzt und einer Temperatur von 900 bis 1200°C, vorzugsweise 1100°C, für eine Zeit von 2 bis 30 Minuten, vorzugsweise 5 bis 15 Minuten, ausgesetzt werden. Durch die Ofenlötung diffundiert das Lot in die äußeren Bereiche der Kontaktflächen der Kolbenwerkstoffe ein und schafft eine feste Verbindung.The internal combustion engine piston designed according to the invention is manufactured in such a way that all separately manufactured parts of the piston are put together with metal foils and a temperature of 900 to 1200 ° C, preferably 1100 ° C, for a time of 2 to 30 minutes, preferably 5 to 15 Minutes. Due to the furnace soldering, the solder diffuses into the outer areas of the contact surfaces of the piston materials and creates a firm connection.

Es ist auch möglich, die unter Einlegen von Metallfolien zusammengesetzten Teile des Kolbens durch Schweißen mittels Ladungsträgerstrahlen zu verbinden.It is also possible to connect the parts of the piston assembled by inserting metal foils by welding using charge carrier jets.

In der Fig. 1 ist ein Ausführungsbeispiel des erfindungsgemäßen Brennkraftmaschinenkolbens dargestellt. Der aus Gußeisen mit Kugelgraphit bestehende Kolben mit Zwangskühlung besitzt freihängende Bolzennaben 1, die über die Rippen 2 mit der Unterseite des Kolbenkopfes 3 und über die Rippen 4 mit dem Kolbenschaft 5 verbunden sind. Im Kolbenschaft 5 sind gegenüber dem Bolzenauge 6 Durchbrechungen 7 angeordnet. Im Kolbenkopf 3 befindet sich ein ringförmiger Kühlkanal 8, der über in der Rippe 2 angeordnete Abnahme- bzw. Abgabekanäle mit den korres-. pondierenden Abnahme- 9 und Abgabe-Öffnungen 10 für die Zu- bzw. Ableitung des Kühlkanals mit den Bolzennaben 1 verbunden ist. Der aus Feuersteg 11 und erster Ringnute 12 bestehende Oberteil des Kolbens und der aus Kolbenschaft 5 und den Ringnuten 13, 14, 15 gebildete Unterteil des Kolbens sind getrennt voneinander hergestellt und über eine Kupferzwischenschicht 16 von 0,1 mm Dicke hart miteinander verlötet. Die Trennebene verläuft in abgestufter Form in Höhe des Kühlkanals.1 shows an embodiment of the internal combustion engine piston according to the invention. The one out Cast iron with spheroidal graphite with forced cooling has free-hanging pin bosses 1, which are connected to the underside of the piston head 3 via the ribs 2 and to the piston skirt 5 via the ribs 4. In the piston skirt 5 6 openings 7 are arranged opposite the bolt eye. In the piston head 3 there is an annular cooling duct 8 which communicates with the corres. Via removal or dispensing channels arranged in the rib 2. Bonding take-off 9 and discharge openings 10 for the supply and discharge of the cooling channel is connected to the pin bosses 1. The upper part of the piston consisting of the top land 11 and the first annular groove 12 and the lower part of the piston formed from the piston skirt 5 and the annular grooves 13, 14, 15 are produced separately from one another and brazed to one another via an intermediate copper layer 16 of 0.1 mm thickness. The parting line runs in a graduated form at the level of the cooling channel.

In der Fig. 2 ist ein weiteres Beispiel des erfindungsgemäß aus drei Teilen bestehenden Brennkraftmaschinenkolbens mit Spritzkühlung und Brennraummulde dargestellt. Die Teile 17, 18, 20, die aus verschiedenen Werkstoffen bestehen, sind teilweise mittels Ladungsträgerstrahlen miteinander verbunden und teilweise miteinander verlötet. Das aus einem warmfesten Schmiedewerkstoff hergestellte Oberteil 17 ist mittels Ladungsträgerstrahlen mit dem Mittelteil 18 aus Gußeisen mit Kugelgraphit über die Trennebene 19 verschweißt. Das Mittelteil 18 stützt sich auf das aus Gußeisen mit Kugelgraphit gegossene Unterteil 20 ab, welches mit dem Zwischenteil 18 durch in der abgesetzten Trennebene 21 verlaufende intermetallische Zwischenschicht verbunden ist. Dabei ist die Trennebene 21 zwischen Mittelteil 18 und Unterteil 20 so angeordnet, daß der in Ober- und Mittelteil angebrachte Kühlkanal 22 eine einfache geometrische Form erhält, welche mit einfachen Werkzeugen und geringstem Aufwand herstellbar ist. Im Unterteil 20 sind die vertikalen Rippen 23.und die horizontalen, mit dem Bolzenauge 25. verbundenen Rippen 24 angeordnet. Die Kühlmittelzufuhr bzw. -abfuhr erfolgt über die in den Rippen 23 eingegossenen Kanälen 26, 27.2 shows a further example of the internal combustion engine piston comprising three parts according to the invention with spray cooling and combustion chamber trough. The parts 17, 18, 20, which consist of different materials, are partially connected to one another by means of charge carrier jets and partially soldered to one another. The upper part 17 made of a heat-resistant forged material is welded to the middle part 18 made of spheroidal graphite cast iron via the parting plane 19 by means of charge carrier blasting. The middle part 18 is supported on the lower part 20 cast from spheroidal graphite cast iron, which is connected to the intermediate part 18 by an intermetallic intermediate layer running in the separated parting plane 21. The parting plane 21 between the middle part 18 and the lower part 20 is arranged such that the one attached in the upper and middle part Cooling channel 22 receives a simple geometric shape, which can be produced with simple tools and the least effort. The vertical ribs 23 and the horizontal ribs 24 connected to the bolt eye 25 are arranged in the lower part 20. The coolant is supplied or removed via the channels 26, 27 cast into the ribs 23.

Die mit der Erfindung erreichten Vorteile bestehen darin, daß Kolben der eingangs genannten Bauart auf vergleichsweise einfache Art und Weise herstellbar sind.The advantages achieved by the invention are that pistons of the type mentioned in the introduction can be manufactured in a comparatively simple manner.

Claims (12)

1. Gekühlter, ganz oder teilweise aus einem Eisenwerkstoff bestehender Brennkraftmaschinenkolben, insbesondere für Dieselmotoren, mit einem im Kolbenkopf hinter der Ringpartie wenigstens im Bereich der ersten Ringnute ringförmig umlaufenden Kühlkanal, bei dem die freihängenden Bolzennaben durch Rippen mit der Innenseite des Kolbenbodens und dem Kolbenschaft verbunden und im Kolbenschaft gegenüber den Bolzenaugen Durchbrechungen angeordnet sind, wobei der Kühlkanal über entsprechende, im wesentlichen parallel zur Kolbenachse verlaufende Kühlmittelzu- bzw. -ablaufleitungen mit dem Kühlmittelumlaufsystem verbunden ist, dadurch gekennzeichnet, daß der Kolben aus mehreren im Bereich der Trennebenen (16, 19, 21) über eine intermetallische Zwischenschicht fest miteinander verbundenen Teilen (3, 5, 17, 18, 20) besteht.1.Cooled internal combustion engine piston consisting entirely or partially of an iron material, in particular for diesel engines, with a cooling channel which is circular in the piston head behind the ring section at least in the region of the first ring groove and in which the freely suspended pin bosses are connected by ribs to the inside of the piston crown and the piston skirt and openings are arranged in the piston skirt opposite the pin eyes, the cooling channel being connected to the coolant circulation system via corresponding coolant inlet and outlet lines running essentially parallel to the piston axis, characterized in that the piston consists of several in the region of the parting planes (16, 19 , 21) consists of parts (3, 5, 17, 18, 20) which are firmly connected to one another via an intermetallic intermediate layer. 2. Brennkraftmaschinenkolben nach Anspruch 1, dadurch gekennzeichnet, daß der Kolben wenigstens aus einem Oberteil (3) und einem Unterteil (5) besteht.2. Internal combustion engine piston according to claim 1, characterized in that the piston consists of at least one upper part (3) and one lower part (5). 3. Brennkraftmaschinenkolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Trennebene (16,'21) in Höhe des Kühlkanals angebracht ist.3. Internal combustion engine piston according to claims 1 and 2, characterized in that the parting plane (16, '21) is mounted at the level of the cooling channel. 4. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Trennebene (1.6, 21) in mindestens zwei Stufen abgesetzt ist.4. Internal combustion engine piston according to one or more of claims 1 to 3, characterized in that the parting plane (1.6, 21) is offset in at least two stages. 5. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Trennebene (16, 17, 21) zur Horizontalen geneigt ist.5. Internal combustion engine piston according to one or more of claims 1 to 4, characterized in that the parting plane (16, 17, 21) is inclined to the horizontal. 6. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Trennebene (16, 17, 21) zur Horizontalen geneigt ist.6. Internal combustion engine piston according to one or more of claims 1 to 4, characterized in that the parting plane (16, 17, 21) is inclined to the horizontal. 7. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß wenigstens eines der Teile des Kolbens aus Gußeisen mit Kugelgraphit, Stahl, Beryllium-Bronze oder warmfesten Legierungen wie Stellit oder Nimonic besteht.7. Internal combustion engine piston according to one or more of claims 1 to 6, characterized in that at least one of the parts of the piston consists of cast iron with spheroidal graphite, steel, beryllium bronze or heat-resistant alloys such as stellite or nimonic. 8. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß für das Oberteil (3) bzw. für das die Kolbenringnuten oder einen Teil von diesen beinhaltende Kolbenteil vorzugsweise ein Werkstoff gewählt wird, der induktiv härtbar ist und die Nutenflanken mindestens der obersten der die Kolbenringe tragenden Nuten (12) gehärtet sind.8. Internal combustion engine piston according to one or more of claims 1 to 7, characterized in that a material is preferably selected for the upper part (3) or for the piston part containing the piston ring grooves or a part thereof, which is inductively hardenable and the groove flanks at least the uppermost of the grooves (12) carrying the piston rings are hardened. 9. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Zwischenschicht aus Kupfer oder Kupferlegierungen besteht.9. Brenn k raft machine piston according to one or more of claims 1 to 8, characterized in that the intermediate layer consists of copper or copper alloys. 10. Brennkraftmaschinenkolben nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Zwischenschicht aus Silber oder einer Silberlegierung besteht.10. Internal combustion engine piston according to one or more of claims 1 to 8, characterized in that the intermediate layer consists of silver or a silver alloy. 11. Verfahren zur Herstellung des Kolbens nach den Ansprüchen 1 bis 10, dadurch gekennzeichnet, daß die zu verbindenden Teile unter Einlegen von Metallfolien zusammengesetzt und bei einer Temperatur von 900 bis 1200oC, vorzugs- weise 2200°C, 2 bis 30 Minuten, vorzugsweise 5 bis 15 Minuten, in inerter Atmosphäre erwärmt werden.11. A process for the manufacture of the piston according to claims 1 to 10, characterized in that the parts to be joined are assembled by inserting metal foils and at a temperature of 900 to 1200 o C, preferably 2200 ° C, 2 to 30 minutes, preferably 5 to 15 minutes, are heated in an inert atmosphere. 12. Verfahren zur Herstellung des Brennkraftmaschinenkolbens nach einem oder mehreren der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Verbindung durch eine Schweißung mit Ladungsträgerstrahlen erfolgt.12. A method for producing the internal combustion engine piston according to one or more of claims 1 to 1 0, characterized in that the connection is made by welding with charge carrier jets.
EP19780200004 1977-07-04 1978-06-01 Cooled piston for an internal-combustion engine and method for producing same Expired EP0000592B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2730120 1977-07-04
DE19772730120 DE2730120A1 (en) 1977-07-04 1977-07-04 COOLED INTERNAL COMBUSTION PISTON

Publications (2)

Publication Number Publication Date
EP0000592A1 true EP0000592A1 (en) 1979-02-07
EP0000592B1 EP0000592B1 (en) 1981-01-07

Family

ID=6013111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780200004 Expired EP0000592B1 (en) 1977-07-04 1978-06-01 Cooled piston for an internal-combustion engine and method for producing same

Country Status (4)

Country Link
EP (1) EP0000592B1 (en)
JP (1) JPS5428949A (en)
BR (1) BR7804259A (en)
DE (2) DE2730120A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1061249A3 (en) * 1999-06-17 2001-11-21 Caterpillar Inc. Method and apparatus for making a two piece unitary piston
WO2002020971A1 (en) * 2000-09-06 2002-03-14 Federal-Mogul Bradford Limited Piston for internal combustion engine
WO2011056822A3 (en) * 2009-11-06 2011-09-09 Federal-Mogul Corporation Steel piston with cooling gallery and method of construction thereof
CN102483009A (en) * 2009-07-14 2012-05-30 马勒国际公司 Multi-part piston for an internal combustion engine and method for the production thereof
US9970384B2 (en) 2009-11-06 2018-05-15 Federal-Mogul Llc Steel piston with cooling gallery and method of construction thereof

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2919638A1 (en) * 1979-05-16 1980-11-20 Schmidt Gmbh Karl PISTON FOR INTERNAL COMBUSTION ENGINES
JPS578335U (en) * 1980-06-18 1982-01-16
DE9108696U1 (en) * 1991-07-15 1991-08-29 Alcan Deutschland Gmbh, 3400 Goettingen, De
DE19510050A1 (en) * 1995-03-20 1996-09-26 Mahle Gmbh Lightweight, cast piston for IC engine
DE102004038465A1 (en) * 2004-08-07 2006-02-23 Ks Kolbenschmidt Gmbh Cooling channel piston for internal combustion engine, has connecting part with joining areas in direction of head and base part of piston, respectively, where areas of connecting part corresponds with joining areas of head and base part
DE102007044106A1 (en) * 2007-09-15 2009-03-19 Mahle International Gmbh Two-piece piston for an internal combustion engine
DE102007061601A1 (en) * 2007-12-20 2009-06-25 Mahle International Gmbh Piston for an internal combustion engine and method for its production
US20110197845A1 (en) * 2010-02-17 2011-08-18 William Flowers Piston assembly
US9856820B2 (en) 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly
US8973484B2 (en) 2011-07-01 2015-03-10 Mahle Industries Inc. Piston with cooling gallery
US9243709B2 (en) * 2013-03-14 2016-01-26 Mahle International Gmbh Welded piston assembly
KR101874559B1 (en) 2016-12-07 2018-08-02 동양피스톤 주식회사 Piston for vehicle engine and method for manufacturing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE393451C (en) * 1924-04-11 Maschf Augsburg Nuernberg Ag Exchangeable, cooled piston crown for large diesel engines
GB769919A (en) * 1954-06-10 1957-03-13 Maybach Motorenbau Gmbh Improvements in or relating to oil-cooled pistons for high-speed internal combustionengines
DE1801792A1 (en) * 1967-10-09 1969-08-21 Caterpillar Tractor Co piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE393451C (en) * 1924-04-11 Maschf Augsburg Nuernberg Ag Exchangeable, cooled piston crown for large diesel engines
GB769919A (en) * 1954-06-10 1957-03-13 Maybach Motorenbau Gmbh Improvements in or relating to oil-cooled pistons for high-speed internal combustionengines
DE1801792A1 (en) * 1967-10-09 1969-08-21 Caterpillar Tractor Co piston

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1061249A3 (en) * 1999-06-17 2001-11-21 Caterpillar Inc. Method and apparatus for making a two piece unitary piston
WO2002020971A1 (en) * 2000-09-06 2002-03-14 Federal-Mogul Bradford Limited Piston for internal combustion engine
CN102483009A (en) * 2009-07-14 2012-05-30 马勒国际公司 Multi-part piston for an internal combustion engine and method for the production thereof
CN102483009B (en) * 2009-07-14 2015-04-22 马勒国际公司 Method for the production of multi-part piston for an internal combustion engine
WO2011056822A3 (en) * 2009-11-06 2011-09-09 Federal-Mogul Corporation Steel piston with cooling gallery and method of construction thereof
CN102667124A (en) * 2009-11-06 2012-09-12 费德罗-莫格尔公司 Steel piston with cooling gallery and method of construction thereof
US8807109B2 (en) 2009-11-06 2014-08-19 Federal-Mogul Corporation Steel piston with cooling gallery and method of construction thereof
CN102667124B (en) * 2009-11-06 2014-08-20 费德罗-莫格尔公司 Steel piston with cooling gallery and method of construction thereof
US9970384B2 (en) 2009-11-06 2018-05-15 Federal-Mogul Llc Steel piston with cooling gallery and method of construction thereof
US10590884B2 (en) 2009-11-06 2020-03-17 Tenneco Inc Steel piston with cooling gallery and method of construction thereof

Also Published As

Publication number Publication date
JPS5428949A (en) 1979-03-03
DE2860397D1 (en) 1981-02-26
DE2730120A1 (en) 1979-01-25
EP0000592B1 (en) 1981-01-07
BR7804259A (en) 1979-04-17

Similar Documents

Publication Publication Date Title
EP0000592B1 (en) Cooled piston for an internal-combustion engine and method for producing same
DE4112889C2 (en) Process for producing a piston head with cooling for a multi-part, articulated piston for internal combustion engines, and piston head produced thereafter
DE69926583T2 (en) Method and device for producing a two-part piston
DE1955903A1 (en) Piston for combustion engine
DE10244513A1 (en) Multi-part cooled piston for an internal combustion engine and method for its production
EP0464626A1 (en) Assembled oil cooled piston for diesel engines
DE19716702C2 (en) Metallic mold arrangement for a reciprocating piston and reciprocating piston, in particular for internal combustion engines
EP2440760A1 (en) Light-metal piston having a multiple omega-shaped combustion bowl
DE102005015186A1 (en) Manufacture of composite automobile component castings including pistons, casts in two stages between which cores are exchanged
DE102012208007A1 (en) Diesel piston, useful for combustion engine, comprises head that defines dome on its upper side, and metal laminated plastic having layers, which are arranged at portion of dome, where plastic comprises low heat-resistant metal layer
DE2402337A1 (en) METHOD OF MANUFACTURING A LIGHT ALLOY PISTON WITH AN ANNUAL COOLING CHANNEL ARRANGED IN ITS HEAD PART
DE1097210B (en) Pistons for internal combustion engines
DE10042207C2 (en) Pistons for an internal combustion engine and method for producing a piston
EP0520536B1 (en) Assembled, oil cooled piston for Diesel engines
EP1912754B1 (en) Unmachined cylinder head casting, cast cylinder head for diesel internal combustion engines, and process for producing an unmachined cylinder head casting
DE102008031864A1 (en) Insert for piston of internal combustion engine i.e. diesel engine, has supporting and cavity base parts that are arranged radially at distance from each other and connected with one another by covers, such that cooling channel is formed
DE19714062C2 (en) Cylinder crankcase with welded bridges
DE19612678A1 (en) Method of producing cast piece
DE2238335A1 (en) PISTON WITH A PISTON RING HOLDER
DE2546388A1 (en) IC engine liquid cooled piston - has piston crown of two welded sections bolted to piston skirt
DE102009045642A1 (en) Abrasion-resistant piston ring carrier for being embedded in piston of diesel engine, has connection hole connecting oil passage and external chamber, where section of inner, upper and lower wall sections is formed in external chamber
DE102021128792B3 (en) Piston for a reciprocating engine, corresponding engine and motor vehicle with such
DE3812479C2 (en)
CH422426A (en) Process for the production of liquid-cooled pistons and pistons produced by the process
DE2435377A1 (en) COOLED PISTON FOR COMBUSTION ENGINES AND METHOD FOR MANUFACTURING THEREOF

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL SE

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB NL SE

REF Corresponds to:

Ref document number: 2850397

Country of ref document: DE

Date of ref document: 19810226

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19810630

Year of fee payment: 4

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: MAHLE GMBH

Effective date: 19810919

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19830101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19840718

Year of fee payment: 7

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

27O Opposition rejected

Effective date: 19850127

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890313

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890314

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890601

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PLBM Termination of opposition procedure: date of legal effect published

Free format text: ORIGINAL CODE: 0009276

27C Opposition proceedings terminated

Effective date: 19850126

EUG Se: european patent has lapsed

Ref document number: 78200004.6

Effective date: 19910206

PLBO Opposition rejected

Free format text: ORIGINAL CODE: EPIDOS REJO

PLAE Information related to rejection of opposition modified

Free format text: ORIGINAL CODE: 0009299REJO

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

Free format text: STATUS: OPPOSITION REJECTED

D27O Information related to the rejection of opposition deleted