EP0463650A1 - Lightweight metal piston - Google Patents

Lightweight metal piston Download PDF

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Publication number
EP0463650A1
EP0463650A1 EP91201030A EP91201030A EP0463650A1 EP 0463650 A1 EP0463650 A1 EP 0463650A1 EP 91201030 A EP91201030 A EP 91201030A EP 91201030 A EP91201030 A EP 91201030A EP 0463650 A1 EP0463650 A1 EP 0463650A1
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EP
European Patent Office
Prior art keywords
piston
molded body
light metal
fiber molded
fiber
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Withdrawn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
EP91201030A
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German (de)
French (fr)
Inventor
Gerhard Dr. Bloschies
Siegfried Dr. Mielke
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.)
Kolbenschmidt AG
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Kolbenschmidt AG
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Publication date
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Publication of EP0463650A1 publication Critical patent/EP0463650A1/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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
    • 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
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • 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
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to a press-cast light alloy piston made of aluminum alloy suitable for piston construction for diesel engines with indirect fuel injection, on the bottom of which a cylindrical fiber molded body is cast with a flat, preferably finger-shaped or glasses-shaped combustion bowl, which is adapted to the jet direction of the flame jets emerging from the combustion chamber arranged in the cylinder head.
  • the combustion chamber is divided into a combustion chamber located in the cylinder head and a flat combustion bowl in the piston crown.
  • the combustion bowl is preferably designed to be finger-shaped or glasses-shaped to match the beam direction of the flame jets emerging from the combustion chamber.
  • cracks mostly appear at the bottom of the combustion bowl due to the superimposition of thermal and mechanical AC voltages. After a long period of operation, these cracks can cover the entire cross-section of the piston crown.
  • the hard anodizing (hard anodizing) of the piston crown has proven itself as a material measure against the influences of the surface temperature fluctuating with the combustion cycle.
  • the thickness of the anodically deposited oxide layer is 30 to 100 ⁇ m, which increases the service life of the piston crown by a factor of 3 to 5, in particular in the event of thermal alternating stress.
  • a further step in increasing the load capacity of the light metal piston is the die casting process, in which the light metal melt is filled into the mold with an adjustable pressure and then solidified under high pressure of up to over 1000 bar. This casting process is used used for the production of light metal pistons for diesel engines with molded fiber body cast in the piston crown with a combustion bowl attached therein.
  • the final pressure of over 1000 bar brings the melt and the fibers to an atomic distance, so that the controlled reaction necessary for a good bond between the fiber and the matrix occurs.
  • the fiber reinforcement is generally carried out by means of a cylindrical fiber molded body made of aluminum oxide fibers, aluminum silicate fibers or silicon carbide whiskers, the fiber / whisker content being up to 30% by volume.
  • the thermal shock resistance of the light metal material of the piston crown which is protected from the hot flame jets by the fiber molding, is excellent due to the low thermal conductivity and low expansion.
  • the first cracks only appear after approx. 7000 temperature changes; the growth of the cracks is only relatively small with increasing test duration (KS anniversary publication: 75 years Kolbenschmidt AG, Neckarsulm September 1985, p. 14).
  • the heat conduction of the light metal piston is reduced by more than 1/3 by using a molded fiber body.
  • the low heat conduction has both positive and negative effects on the durability of the light metal piston.
  • the fiber reinforcement of the piston crown reduces the thermal load capacity of the light metal material on the one hand, and on the other hand greater heat conduction is desirable in the region of the piston crown that does not lie in the beam direction of the flame jets emerging from the combustion chamber of the cylinder head, so that the temperature of the other piston parts does not increase is greatly reduced.
  • This object is achieved in that the height of the fiber molding on the side on which the combustion bowl is arranged is greater than in the rest of the piston crown.
  • the fiber molded body has an obliquely cut surface on the side facing the piston interior.
  • the fiber molded body has the shape of a cylinder which is cut obliquely on one side or the shape of a cylinder hoof.
  • the height of the fiber molding is 5 to 15 mm on the edge of one side and 2 to 8 mm on the edge of the opposite side.
  • the fibers of the molded body are aligned parallel to the plane including the piston axis and the axis of the piston pin direction, within this plane the orientation of the fibers is statistically random.
  • the constructive design according to the invention of the fiber molded body cast into the piston crown ensures that the temperature increase of the piston material under the fiber molded body in the area of the combustion bowl is kept within limits, but on the other hand the temperature of the other piston parts can be kept at the desired level. Since the costs for fiber shaped bodies made of aluminum oxide fibers, aluminum silicate fibers or silicon carbide whiskers are relatively high, the fiber shaped body designed according to the invention can advantageously save up to 30% in costs.
  • the diameter of the fiber molded body (5) which has a height (7) at the edge of one side in the plane including the piston axis and the axis perpendicular to the piston pin axis direction 7 mm and at the edge of the opposite side has a height (7) of 2.5 mm.
  • a ring carrier (8) consisting of austenitic special cast iron is cast in with a metallic bond.
  • the pin bores (9) are located in the piston skirt (3), which is designed as a continuous surface of rotation.

Abstract

In the case of a lightweight metal piston (4) for diesel engines with indirect fuel injection, a moulded fibre part (5) having a flat combustion trough (6) is cast onto the piston head (1). In order to improve the thermal conduction outside the area of the combustion trough (6), the height of the moulded fibre part (5) is greater on the combustion trough side than in the remaining area of the piston head (1). …<IMAGE>…

Description

Die Erfindung betrifft einen preßgegossenen Leichtmetallkolben aus für den Kolbenbau geeigneter Aluminiumlegierung für Dieselmotoren mit indirekter Kraftstoffeinspritzung, an dessen Boden ein zylinderförmiger Faserformkörper mit einer flachen, der Strahlrichtung der aus der im Zylinderkopf angeordneten Brennkammer austretenden Flammstrahlen angepaßten, vorzugsweise fingerförmigen oder brillenförmigen Verbrennungsmulde angegossen ist.The invention relates to a press-cast light alloy piston made of aluminum alloy suitable for piston construction for diesel engines with indirect fuel injection, on the bottom of which a cylindrical fiber molded body is cast with a flat, preferably finger-shaped or glasses-shaped combustion bowl, which is adapted to the jet direction of the flame jets emerging from the combustion chamber arranged in the cylinder head.

Bei Leichtmetallkolben für Dieselmotoren mit indirekter Kraftstoffeinspritzung ist der Verbrennungsraum in eine im Zylinderkopf befindliche Brennkammer und eine im Kolbenboden angebrachte flache Verbrennungsmulde unterteilt. Die Verbrennungsmulde ist in Anpassung an die Strahlrichtung der aus der Brennkammer austretenden Flammstrahlen vorzugsweise fingerförmig oder brillenförmig ausgebildet. Besonders bei stark wechselnden Motorbelastungen treten durch Überlagerung von thermischen und mechanischen Wechselspannungen Risse meistens am Grund der Verbrennungsmulde auf. Diese Risse können nach längerer Betriebszeit den ganzen Querschnitt des Kolbenbodens erfassen. Als werkstoffliche Maßnahme gegen die Einflüsse der mit dem Verbrennungszyklus schwankenden Oberflächentemperatur hat sich vor allem die Hartanodisierung (Harteloxierung) des Kolbenbodens bewährt. Die Dicke der anodisch abgeschiedenen Oxidschicht beträgt 30 bis 100 um, wodurch die Lebensdauer des Kolbenbodens insbesondere bei thermischer Wechselbeanspruchung um den Faktor 3 bis 5 erhöht wird. Bei besonders hoch belasteten Dieselmotoren ist zum Schutz des Kolbenbodens auch bekannt, eine Prallplatte aus hitzebeständigem Stahl in diesen einzuschrauben (Mahle-Kolbenkunde, Heft 2, Stuttgart 1985, S. 16). Als weiterer Schritt, die Belastbarkeit des Leichtmetallkolbens zu erhöhen, ist das Preßgießverfahren anzusehen, bei dem die Leichtmetallschmelze mit einem beliebig einstellbaren Druck in die Gießform gefüllt und anschließend unter hohem Druck von bis über 1000 bar zur Erstarrung gebracht wird. Dieses Gießverfahren wird u.a. zur Herstellung von Leichtmetallkolben für Dieselmotoren mit im Kolbenboden eingegossenem Faserformkörper mit darin angebrachter Verbrennungsmulde benutzt. Der Enddruck von über 1000 bar bringt die Schmelze und die Fasern auf atomaren Abstand, so daß es zu der für eine gute Bindung von Faser und Matrix notwendigen gesteuerten Reaktion kommt. Die Faserverstärkung erfolgt in aller Regel mittels eines zylinderförmigen Faserformkörpers aus Aluminiumoxidfasern, Aluminiumsilikatfasern oder Siliziumcarbidwhiskern, wobei der Faser-/Whiskergehalt bis zu 30 Vol.-% beträgt. Die Temperaturwechselbeständigkeit des durch den Faserformkörper vor den heißen Flammstrahlen geschützten Leichtmetallwerkstoffs des Kolbenbodens ist infolge der geringen Wärmeleitfähigkeit und geringen Ausdehnung ausgezeichnet. Erste Anrisse treten erst nach ca. 7000 Temperaturwechseln auf; das Wachstum der Anrisse ist mit zunehmender Prüfdauer aber nur verhältnismäßig gering (KS-Jubiläumsschrift: 75 Jahre Kolbenschmidt AG, Neckarsulm September 1985, S. 14). Die Wärmeleitung des Leichtmetallkolbens wird durch den Einsatz eines Faserformkörpers um über 1/3 reduziert.In light-alloy pistons for diesel engines with indirect fuel injection, the combustion chamber is divided into a combustion chamber located in the cylinder head and a flat combustion bowl in the piston crown. The combustion bowl is preferably designed to be finger-shaped or glasses-shaped to match the beam direction of the flame jets emerging from the combustion chamber. Especially with strongly changing engine loads, cracks mostly appear at the bottom of the combustion bowl due to the superimposition of thermal and mechanical AC voltages. After a long period of operation, these cracks can cover the entire cross-section of the piston crown. The hard anodizing (hard anodizing) of the piston crown has proven itself as a material measure against the influences of the surface temperature fluctuating with the combustion cycle. The thickness of the anodically deposited oxide layer is 30 to 100 μm, which increases the service life of the piston crown by a factor of 3 to 5, in particular in the event of thermal alternating stress. In the case of particularly heavily loaded diesel engines, it is also known to protect the piston crown to screw a baffle plate made of heat-resistant steel into it (Mahle-Kolbenkunde, issue 2, Stuttgart 1985, p. 16). A further step in increasing the load capacity of the light metal piston is the die casting process, in which the light metal melt is filled into the mold with an adjustable pressure and then solidified under high pressure of up to over 1000 bar. This casting process is used used for the production of light metal pistons for diesel engines with molded fiber body cast in the piston crown with a combustion bowl attached therein. The final pressure of over 1000 bar brings the melt and the fibers to an atomic distance, so that the controlled reaction necessary for a good bond between the fiber and the matrix occurs. The fiber reinforcement is generally carried out by means of a cylindrical fiber molded body made of aluminum oxide fibers, aluminum silicate fibers or silicon carbide whiskers, the fiber / whisker content being up to 30% by volume. The thermal shock resistance of the light metal material of the piston crown, which is protected from the hot flame jets by the fiber molding, is excellent due to the low thermal conductivity and low expansion. The first cracks only appear after approx. 7000 temperature changes; the growth of the cracks is only relatively small with increasing test duration (KS anniversary publication: 75 years Kolbenschmidt AG, Neckarsulm September 1985, p. 14). The heat conduction of the light metal piston is reduced by more than 1/3 by using a molded fiber body.

Die geringe Wärmeleitung hat sowohl positive als auch negative Auswirkungen auf die Beanspruchbarkeit des Leichtmetallkolbens. Durch die Faserverstärkung des Kolbenbodens wird einerseits die thermische Belastbarkeit des Leichtmetallwerkstoffs gesenkt, andererseits ist in dem Bereich des Kolbenbodens, der nicht in der Strahlrichtung der aus dem Brennraum des Zylinderkopfs austretenden Flammstrahlen liegt, eine größere Wärmeleitung wünschenswert, damit die Temperatur der übrigen Kolbenpartien nicht zu stark gesenkt wird.The low heat conduction has both positive and negative effects on the durability of the light metal piston. The fiber reinforcement of the piston crown reduces the thermal load capacity of the light metal material on the one hand, and on the other hand greater heat conduction is desirable in the region of the piston crown that does not lie in the beam direction of the flame jets emerging from the combustion chamber of the cylinder head, so that the temperature of the other piston parts does not increase is greatly reduced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Höhe des Faserformkörpers auf der Seite, auf der die Verbrennungsmulde angeordnet ist, größer als im übrigen Bereich des Kolbenbodens ist.This object is achieved in that the height of the fiber molding on the side on which the combustion bowl is arranged is greater than in the rest of the piston crown.

Der Faserformkörper besitzt erfindungsgemäß auf der dem Kolbeninnenraum zugewandten Seite eine schief abgeschnittene Fläche. Zu diesem Zweck weist nach einem weiteren Erfindungsmerkmal der Faserformkörper die Form eines einseitig schief abgeschnittenen Zylinders oder die Form eines Zylinderhufs auf.According to the invention, the fiber molded body has an obliquely cut surface on the side facing the piston interior. For this purpose, according to a further feature of the invention, the fiber molded body has the shape of a cylinder which is cut obliquely on one side or the shape of a cylinder hoof.

Im Rahmen der besonderen Ausgestaltung der Erfindung beträgt die Höhe des Faserformkörpers am Rand der einen Seite 5 bis 15 mm und am Rand der gegenüberliegenden Seite 2 bis 8 mm.In the context of the special embodiment of the invention, the height of the fiber molding is 5 to 15 mm on the edge of one side and 2 to 8 mm on the edge of the opposite side.

Die Fasern des Formkörpers sind parallel zu der die Kolbenachse und die Achse der Kolbenbolzenrichtung einschließenden Ebene ausgerichtet, innerhalb dieser Ebene ist die Orientierung der Fasern statistisch regellos.The fibers of the molded body are aligned parallel to the plane including the piston axis and the axis of the piston pin direction, within this plane the orientation of the fibers is statistically random.

Durch die erfindungsgemäße konstruktive Gestaltung des in den Kolbenboden eingegossenen Faserformkörpers ist sichergestellt, daß die Temperaturerhöhung des Kolbenwerkstoffs unter dem Faserformkörper im Bereich der Verbrennungsmulde in Grenzen gehalten, andererseits jedoch die Temperatur der übrigen Kolbenpartien auf dem gewünschten Niveau gehalten werden kann. Da die Kosten für Faserformkörper aus Aluminiumoxidfasern, Aluminiumsilikatfasern oder Siliziumcarbidwhiskern relativ hoch sind, läßt sich in vorteilhafter Weise mit Hilfe des erfindungsgemäß ausgebildeten Faserformkörpers eine Kostenersparnis von bis zu 30 % erzielen.The constructive design according to the invention of the fiber molded body cast into the piston crown ensures that the temperature increase of the piston material under the fiber molded body in the area of the combustion bowl is kept within limits, but on the other hand the temperature of the other piston parts can be kept at the desired level. Since the costs for fiber shaped bodies made of aluminum oxide fibers, aluminum silicate fibers or silicon carbide whiskers are relatively high, the fiber shaped body designed according to the invention can advantageously save up to 30% in costs.

Die Erfindung ist in der Zeichnung beispielhaft dargestellt und wird nachfolgend näher erläutert. Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Leichtmetallkolben für Dieselmotoren mit indirekter Kraftstoffeinspritzung entlang der die Kolbenachse und die Achse senkrecht zur Kolbenbolzenachsrichtung einschließenden Ebene und
  • Fig. 2 eine Draufsicht auf den Kolbenboden eines Leichtmetallkolbens für Dieselmotoren mit indirekter Kraftstoffeinspritzung.
The invention is exemplary in the drawing shown and will be explained in more detail below. Show it:
  • Fig. 1 shows a longitudinal section through a light metal piston for diesel engines with indirect fuel injection along the plane including the piston axis and the axis perpendicular to the piston pin axis direction and
  • Fig. 2 is a plan view of the piston crown of a light metal piston for diesel engines with indirect fuel injection.

In den Kolbenboden (1) eines aus der Aluminiumlegierung des Typs A!Si12CuNiMg preßgegossenen, einteiligen, Ringpartie (2) und Kolbenschaft (3) umfassenden Kolbens (4) für Dieselmotoren mit indirekter Kraftstoffeinspritzung ist ein die Form eines schief abgeschnittenen Kreiszylinders aufweisender Faserformkörper (5), dessen Durchmesser dem Durchmesser des Kolbens (4) entspricht und der aus A1203-Fasern mit einem Fasergehalt von 25 Vol.-% besteht, eingegossen. In Strahlrichtung der aus dem im Zylinderkopf angeordneten Brennraum austretenden Flammstrahlen befindet sich eine brillenförmige Vertiefung (6) in dem Faserformkörper (5), der in der die Kolbenachse und die Achse senkrecht zur Kolbenbolzenachsrichtung einschließenden Ebene am Rand der einen Seite eine Höhe (7) von 7 mm und am Rand der gegenüberliegenden Seite eine Höhe (7) von 2,5 mm besitzt. Im Bereich der ersten Ringnut ist ein aus austenitischem Sondergußeisen bestehender Ringträger (8) unter metallischer Bindung eingegossen. In dem als stetige Rotationsfläche ausgeführten Kolbenschaft (3) befinden sich die Bolzenbohrungen (9).In the piston crown (1) of a one-piece piston (4) for the diesel engines with indirect fuel injection, which is molded from the aluminum alloy of type A! ), the diameter of which corresponds to the diameter of the piston (4) and which consists of A1 2 0 3 fibers with a fiber content of 25% by volume. In the beam direction of the flame jets emerging from the combustion chamber arranged in the cylinder head, there is an eyeglass-shaped recess (6) in the fiber molded body (5), which has a height (7) at the edge of one side in the plane including the piston axis and the axis perpendicular to the piston pin axis direction 7 mm and at the edge of the opposite side has a height (7) of 2.5 mm. In the area of the first ring groove, a ring carrier (8) consisting of austenitic special cast iron is cast in with a metallic bond. The pin bores (9) are located in the piston skirt (3), which is designed as a continuous surface of rotation.

Claims (5)

1. Preßgegossener Leichtmetallkolben aus für den Kolbenbau geeigneter Aluminiumlegierung für Dieselmotoren mit indirekter Kraftstoffeinspritzung, an dessen Boden ein zylinderförmiger Faserformkörper mit einer flachen, der Strahlrichtung der aus der im Zylinderkopf angeordneten Brennkammer austretenden Flammstrahlen angepaßten, vorzugsweise fingerförmigen oder brillenförmigen Verbrennungsmulde angegossen ist, dadurch gekennzeichnet, daß die Höhe (7) des Faserformkörpers (5) auf der Seite, auf der die Verbrennungsmulde (6) angeordnet ist, größer als im übrigen Bereich des Kolbenbodens (1) ist.1. Die-cast light-alloy piston made of aluminum alloy suitable for piston construction for diesel engines with indirect fuel injection, on the bottom of which a cylindrical fiber molded body is cast with a flat, preferably finger-shaped or glasses-shaped combustion bowl which is adapted to the jet direction of the flame rays emerging from the combustion chamber arranged in the cylinder head, characterized in that that the height (7) of the fiber molding (5) on the side on which the combustion bowl (6) is arranged is greater than in the rest of the piston crown (1). 2. Leichtmetallkolben nach Anspruch 1, dadurch gekennzeichnet, daß der Faserformkörper (5) auf der dem Kolbeninnenraum zugewandten Seite eine schief abgeschnittene Fläche aufweist.2. Light metal piston according to claim 1, characterized in that the fiber molded body (5) on the side facing the piston interior has an obliquely cut surface. 3. Leichtmetallkolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Faserformkörper (5) die Form eines einseitig schief abgeschnittenen Zylinders aufweist.3. Light metal piston according to claims 1 and 2, characterized in that the fiber molded body (5) has the shape of a cylinder cut obliquely on one side. 4. Leichtmetallkolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Faserformkörper (5) die Form eines Zylinderhufs aufweist.4. Light metal piston according to claims 1 and 2, characterized in that the fiber molded body (5) has the shape of a cylinder hoof. 5. Leichtmetallkolben nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Faserformkörper (5) in der die Kolbenachse und die Achse senkrecht zur Kolbenbolzenachsrichtung einschließenden Ebene an dem einen Rand eine Höhe (7) von 5 bis 15 mm und an dem gegenüberliegenden Rand eine Höhe (7) von 2 bis 8 mm aufweist.5. Light metal piston according to claims 1 to 4, characterized in that the fiber molded body (5) in the plane including the piston axis and the axis perpendicular to the piston pin axis direction on one edge a height (7) of 5 to 15 mm and on the opposite edge has a height (7) of 2 to 8 mm.
EP91201030A 1990-06-22 1991-05-01 Lightweight metal piston Withdrawn EP0463650A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4019983A DE4019983A1 (en) 1990-06-22 1990-06-22 LIGHT METAL PISTON
DE4019983 1990-06-22

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EP0463650A1 true EP0463650A1 (en) 1992-01-02

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DE (1) DE4019983A1 (en)

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DE19537847A1 (en) * 1995-10-11 1997-04-17 Mahle Gmbh Reinforcement part, the base material of which is austenitic cast iron
DE19849913C2 (en) * 1998-10-29 2003-02-20 Daimler Chrysler Ag Otto internal combustion engine with external mixture formation
US6910455B2 (en) * 2002-03-13 2005-06-28 Ford Global Technologies, Llc Spark ignition engine with shallow bowl-in-piston geometry
JP2006258012A (en) * 2005-03-18 2006-09-28 Toyota Motor Corp Internal combustion engine
JP2007231830A (en) * 2006-03-01 2007-09-13 Nissan Motor Co Ltd Piston for internal combustion engine
JP4458496B2 (en) * 2008-04-16 2010-04-28 株式会社豊田中央研究所 In-cylinder injection internal combustion engine, piston for in-cylinder injection internal combustion engine, method for manufacturing piston for in-cylinder injection internal combustion engine
US10443537B2 (en) 2015-12-28 2019-10-15 Tenneco Inc. Piston including a composite layer applied to a metal substrate
JP2018127972A (en) * 2017-02-09 2018-08-16 日立オートモティブシステムズ株式会社 Piston for internal combustion engine and method of manufacturing the same

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* Cited by examiner, † Cited by third party
Title
KOLBENSCHMIDT '75 JAHRE KOLBENSCHMIDT' January 1, 1985 , KOLBENSCHMIDT , NECKARSULM *

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JPH04231656A (en) 1992-08-20
DE4019983A1 (en) 1992-01-02
US5092289A (en) 1992-03-03

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