EP0902180A2 - Lightweight metal piston for an internal combustion engine - Google Patents

Lightweight metal piston for an internal combustion engine Download PDF

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Publication number
EP0902180A2
EP0902180A2 EP98117145A EP98117145A EP0902180A2 EP 0902180 A2 EP0902180 A2 EP 0902180A2 EP 98117145 A EP98117145 A EP 98117145A EP 98117145 A EP98117145 A EP 98117145A EP 0902180 A2 EP0902180 A2 EP 0902180A2
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EP
European Patent Office
Prior art keywords
piston
light metal
hubs
metal piston
piston according
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Granted
Application number
EP98117145A
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German (de)
French (fr)
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EP0902180A3 (en
EP0902180B1 (en
Inventor
Johannes Spermann
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KS Kolbenschmidt GmbH
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KS Kolbenschmidt GmbH
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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
    • F02F3/00—Pistons 
    • 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 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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

Definitions

  • the invention relates to a light metal piston for Internal combustion engines with a roof-shaped piston crown one especially asymmetrical Combustion chamber trough.
  • Such a piston is known.
  • the piston crown faces two flat piston crown surfaces inclined towards each other, the over a common ridge line that runs parallel to the Piston pin axis runs, merge and hereby form the roof shape, so that in Looking at the piston pin direction results in a gable shape.
  • Firing bowl shape affects the top heaviness due to the material accumulation in the head area due to the shape of the roof as disadvantageous, in particular the Piston noise in operation problems and there must be one relatively long shaft length can be used to the To guide pistons in the cylinder and as a result of Evenly absorb the head heaviness and to be able to derive.
  • the object of the invention is to a piston of the type described above improve that the problems mentioned do not occur.
  • This task is carried out with a piston of the type mentioned solved according to the invention in that the hubs in Pin axis direction are reset so that the outer hub distance 60 to 65% of the piston diameter or is less, and that above the outer surfaces of the recessed hubs an angle ⁇ in the circumferential direction open cavity enclosing between 45 and 60 ° is provided, which is in the direction of the piston crown extends the area behind the ring field, and that the hub inner surfaces trapezoidal or stepped are offset, and the shaft length 35 to 40% of the piston diameter is.
  • the top-heavyness of the piston is reduced.
  • the hub will reset radially outside of the Outside surface of the hubs space for the formation of the weight-reducing cavities above the hubs created. It has been shown that through a trapezoidal or step-shaped formation of the Inner hub surfaces due to hub reset deteriorated power transmission to the piston pin can be compensated by at least in the upper Area of the hub a sufficient wing between the hub and bolts is available.
  • Hub inner surfaces have proven to be advantageous if this is at an angle of 10 to 15 ° to the The longitudinal axis of the piston is inclined.
  • the stretched in the area behind the ring field Cavities preferably extend at least to over the plane of the groove upper flank delimiting the upper ring groove. If the design of the combustion chamber trough permits, the cavity also extends deeper into the piston crown stretch in to the beneficial weight reduction effect even more effectively. It has been shown that at an extension of the cavity in the circumferential direction of less than 60 °, preferably 50-55 °, a weakening or a distortion of the piston crown and the ring field due to tensile and compressive stresses does not adversely notice if the Cavity up to the named level of the top ring groove delimiting groove flank extends.
  • One of the roof shapes has proven to be particularly advantageous appropriately optimized design of the cavity proved that the depth of the cavity from the formed by the piston pin axis and the piston longitudinal axis Level in the circumferential direction in both directions decreases, d. H. that the depth of the cavity is analogous to that Roof shape runs and, preferably the slope of the Roof shape correspondingly, decreases towards the sides.
  • Piston shank By improving the tribological properties Coating of sections forming the sliding surfaces Piston shank can be the clearance of the piston in the cylinder be kept small.
  • the coating in the form of a Lubricating varnish reduces the tilting movements of the piston impact impulses transmitted to the cylinder wall. Thereby the noise occurring during operation is reduced and it is a reduction in the risk of feeding through reduced Frictional forces on the sliding surfaces even under unfavorable ones Load states in motor operation causes.
  • the figures show a light metal piston with a roof-shaped piston head 2 with a combustion chamber trough 4.
  • An the piston crown 2 encloses the ring field 6 forming circumferential section 8.
  • the one-piece piston comprises two sliding wall sections 10 forming shaft wall sections 12 that form on the section 8 forming the ring field 6 connect and form a total of 14 pin hubs 16 connecting wall sections in FIG Merge circumferentially into one another.
  • the hubs 14 are set back in such a way that the distance of the outer hub surfaces 18 from one another is 65% of the piston diameter D k .
  • the inner hub surfaces 20 are trapezoidal, so that the hubs taper in the direction of the free shaft end.
  • the hub outer surfaces 18 merge without undercuts and flush into the wall surfaces 24 delimiting the cavities 22.
  • the height or depth of the cavities 22 measured in the longitudinal direction of the piston is such that they extend to the plane indicated by reference numeral 26 in FIG. 1, which is defined by the groove flank 28 delimiting the upper annular groove.
  • the shaft length L s is 42% of the piston diameter D k .
  • the piston is made of a light alloy, preferably with a heat-resistant aluminum alloy especially 11-13% by weight Si, 3.3-4.2% by weight Cu, 1.8- 2.5 wt.% Ni produced.
  • a heat-resistant aluminum alloy especially 11-13% by weight Si, 3.3-4.2% by weight Cu, 1.8- 2.5 wt.% Ni produced.

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

Abstract

In a light metal piston with a roof-shaped head, the lugs are offset in the pin axis direction and an open cavity is provided above the outer face of each lug. The inner faces of the lug have a trapezium or stepped shape and the shaft length is 40-45% of the piston diameter. The light metal piston used in an internal combustion engine has a roof-shaped head (2) with a combustion space trough (4), the novelty being that (a) the lugs (14) are offset in the pin axis direction such that the outer lug spacing is 60-65% of the piston diameter or less; (b) an open cavity (22), with an included angle of 45-60 degrees , is provided above the outer faces (18) of the offset lugs (14) and extends towards the piston head (2) in the region behind the ring region (6); (c) the lug inner faces (20) have a trapezium or stepped shape; and (d) the shaft length (Ls) is 40-45% of the piston diameter.

Description

Die Erfindung betrifft einen Leichtmetallkolben für Brennkraftmaschinen mit einem dachförmigen Kolbenboden mit einer insbesondere asymmetrisch ausgebildeten Brennraummulde.The invention relates to a light metal piston for Internal combustion engines with a roof-shaped piston crown one especially asymmetrical Combustion chamber trough.

Ein derartiger Kolben ist bekannt. Der Kolbenboden weist zwei gegeneinander geneigte ebene Kolbenbodenflächen auf, die Über eine gemeinsame Firstlinie, die parallel zur Kolbenbolzenachse verläuft, ineinander übergehen und hierdurch die Dachform bilden, so dass sich in Kolbenbolzenrichtung betrachtet eine Giebelform ergibt. Such a piston is known. The piston crown faces two flat piston crown surfaces inclined towards each other, the over a common ridge line that runs parallel to the Piston pin axis runs, merge and hereby form the roof shape, so that in Looking at the piston pin direction results in a gable shape.

Bei dachförmigen Kolben mit einer im Hinblick auf das spezielle Verbrennungsverfahren optimierten Brennraummuldenform wirkt sich die Kopflastigkeit aufgrund der Materialanhäufung im Kopfbereich infolge der Dachform als nachteilig aus, insbesondere bereitet die Kolbengeräuschbildung im Betrieb Probleme, und es muss eine verhältnismäßig lange Schaftlänge verwendet werden, um den Kolben im Zylinder zu führen und die infolge der Kopflastigkeit auftretenden Kräfte gleichmäßig aufnehmen und ableiten zu können.With roof-shaped pistons with a view to that optimized special combustion processes Firing bowl shape affects the top heaviness due to the material accumulation in the head area due to the shape of the roof as disadvantageous, in particular the Piston noise in operation problems and there must be one relatively long shaft length can be used to the To guide pistons in the cylinder and as a result of Evenly absorb the head heaviness and to be able to derive.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen Kolben der eingangs beschriebenen Art dahingehend zu verbessern, dass die erwähnten Probleme nicht auftreten.Proceeding from this, the object of the invention is to a piston of the type described above improve that the problems mentioned do not occur.

Diese Aufgabe wird bei einem Kolben der genannten Art erfindungsgemäß dadurch gelöst, dass die Naben in Bolzenachsenrichtung derart zurückgesetzt sind, dass der äußere Nabenabstand 60 bis 65 % des Kolbendurchmessers oder weniger beträgt, und dass oberhalb der Außenflächen der zurückgesetzten Naben ein in Umfangsrichtung einen Winkel α zwischen 45 und 60° einschließender offener Hohlraum vorgesehen ist, der sich in Richtung auf den Kolbenboden in den Bereich hinter dem Ringfeld hineinerstreckt, und dass die Nabeninnenflächen trapezförmig oder stufenförmig abgesetzt ausgebildet sind, und die Schaftlänge 35 bis 40 % des Kolbendurchmessers beträgt.This task is carried out with a piston of the type mentioned solved according to the invention in that the hubs in Pin axis direction are reset so that the outer hub distance 60 to 65% of the piston diameter or is less, and that above the outer surfaces of the recessed hubs an angle α in the circumferential direction open cavity enclosing between 45 and 60 ° is provided, which is in the direction of the piston crown extends the area behind the ring field, and that the hub inner surfaces trapezoidal or stepped are offset, and the shaft length 35 to 40% of the piston diameter is.

Mit den vorstehend genannten Merkmalen wird erfindungsgemäß die Kopflastigkeit des Kolben reduziert. Durch die Zurücksetzung der Naben wird radial außerhalb der Außenfläche der Naben Raum für die Ausbildung der gewichtsreduzierenden Hohlräume oberhalb der Naben geschaffen. Es hat sich gezeigt, dass durch eine trapezförmige oder stufenförmige Ausbildung der Nabeninnenflächen die infolge der Nabenzurücksetzung verschlechterte Kraftübertragung auf den Kolbenbolzen wieder ausgeglichen werden kann, indem zumindest im oberen Bereich der Nabe eine hinreichende Tragfläche zwischen Nabe und Bolzen zur Verfügung steht.With the features mentioned above, the invention the top-heavyness of the piston is reduced. Through the The hub will reset radially outside of the Outside surface of the hubs space for the formation of the weight-reducing cavities above the hubs created. It has been shown that through a trapezoidal or step-shaped formation of the Inner hub surfaces due to hub reset deteriorated power transmission to the piston pin can be compensated by at least in the upper Area of the hub a sufficient wing between the hub and bolts is available.

Es hat sich gezeigt, dass sich ein erfindungsgemäßer Kolben besonders für den Einsatz mit direkter Kraftstoffeinspritzung bei einem Otto-Motor eignet.It has been shown that a piston according to the invention especially for use with direct fuel injection suitable for an Otto engine.

Bei einer trapezförmigen Ausgestaltung der Nabeninnenflächen hat es sich als vorteilhaft erwiesen, wenn diese unter einem Winkel von 10 bis 15° zur Kolbenlängsachse geneigt verlaufen. In a trapezoidal configuration Hub inner surfaces have proven to be advantageous if this is at an angle of 10 to 15 ° to the The longitudinal axis of the piston is inclined.

Die in den Bereich hinter dem Ringfeld erstreckten Hohlräume erstrecken sich vorzugsweise wenigstens bis über die Ebene der die obere Ringnut begrenzenden Nutoberflanke. Sofern es die Ausbildung der Brennraummulde zulässt, kann sich der Hohlraum auch tiefer in den Kolbenboden hineinerstrecken, um die vorteilhafte Gewichtsreduzierung noch effektiver zu bewirken. Es hat sich gezeigt, dass bei einer Erstreckung des Hohlraums in Umfangsrichtung von weniger als 60°, vorzugsweise von 50 - 55°, eine Schwächung bzw. eine Verwindung des Kolbenbodens und des Ringfelds infolge auftretender Zug- und Druckspannungen auch dann nicht in nachteiliger Weise bemerkbar macht, wenn sich der Hohlraum bis zu der genannten Ebene der die obere Ringnut begrenzenden Nutflanke erstreckt.The stretched in the area behind the ring field Cavities preferably extend at least to over the plane of the groove upper flank delimiting the upper ring groove. If the design of the combustion chamber trough permits, the cavity also extends deeper into the piston crown stretch in to the beneficial weight reduction effect even more effectively. It has been shown that at an extension of the cavity in the circumferential direction of less than 60 °, preferably 50-55 °, a weakening or a distortion of the piston crown and the ring field due to tensile and compressive stresses does not adversely notice if the Cavity up to the named level of the top ring groove delimiting groove flank extends.

Als ganz besonders vorteilhaft hat sich eine der Dachform entsprechend optimierte Ausgestaltung des Hohlraums erwiesen, wonach die Tiefe des Hohlraums ausgehend von der durch Kolbenbolzenachse und Kolbenlängsachse gebildeten Ebene in Umfangsrichtung nach beiden Richtungen hin abnimmt, d. h. dass die Tiefe des Hohlraums analog der Dachform verläuft und, vorzugsweise der Neigung der Dachform entsprechend, zu den Seiten hin abnimmt.One of the roof shapes has proven to be particularly advantageous appropriately optimized design of the cavity proved that the depth of the cavity from the formed by the piston pin axis and the piston longitudinal axis Level in the circumferential direction in both directions decreases, d. H. that the depth of the cavity is analogous to that Roof shape runs and, preferably the slope of the Roof shape correspondingly, decreases towards the sides.

Bei einer ganz besonders bevorzugten Ausführungsform der Erfindung gehen die Außenflächen der Naben bündig in den Hohlraum begrenzende Wandflächen über. Hierdurch wird ein hoher Kühlmittelaustausch im Betrieb des Kolbens begünstigt und die Herstellung des Kolbens im Gießprozess wird vereinfacht. In ganz besonders vorteilhafter Weise gehen die Außenflächen der Naben in Richtung auf den Kolbenboden hinterschneidungsfrei in den Hohlraum begrenzende Wandflächen über, wodurch die Herstellung im Kokillengießverfahren unter Verwendung eines hinterschneidungsfreien Kokillengießwerkzeugs möglich ist.In a very particularly preferred embodiment of the Invention go the outer surfaces of the hubs flush in the Wall areas delimiting the cavity. This will be a high coolant exchange during operation of the piston favors and the manufacture of the piston in the casting process simplified. Walk in a particularly advantageous way the outer surfaces of the hubs towards the piston crown undercut into the cavity without any undercuts Wall surfaces over, which means the manufacture in Chill casting process using a undercut-free die casting tool is possible.

Durch eine die tribologischen Eigenschaften verbessernde Beschichtung von Gleitflächen bildenden Abschnitten des Kolbenschafts kann das Einbauspiel des Kolbens im Zylinder klein gehalten werden. Die Beschichtung in Form eines Gleitlacks vermindert die durch Kippbewegungen des Kolbens an die Zylinderwand übertragenen Aufschlagimpulse. Dadurch wird das im Betrieb auftretende Geräusch reduziert und es wird eine Verminderung der Fressgefahr durch herabgesetzte Reibkräfte an den Gleitflächen auch unter ungünstigen Lastzuständen im motorischen Betrieb bewirkt.By improving the tribological properties Coating of sections forming the sliding surfaces Piston shank can be the clearance of the piston in the cylinder be kept small. The coating in the form of a Lubricating varnish reduces the tilting movements of the piston impact impulses transmitted to the cylinder wall. Thereby the noise occurring during operation is reduced and it is a reduction in the risk of feeding through reduced Frictional forces on the sliding surfaces even under unfavorable ones Load states in motor operation causes.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform des erfindungsgemäßen Kolbens.

Figur 1
zeigt einen Längsschnitt durch die von Kolbenlängsachse und Kolbenbolzenachse gebildete Ebene; und
Figur 2
zeigt eine Ansicht auf die Ebene II-II in Figur 1; und
Figur 3
eine Seitenansicht des Kolbens in Richtung der Kolbenbolzenachse.
Further features, details and advantages of the invention result from the appended claims and the drawing and the following description of a preferred embodiment of the piston according to the invention.
Figure 1
shows a longitudinal section through the plane formed by the longitudinal piston axis and piston pin axis; and
Figure 2
shows a view of the plane II-II in Figure 1; and
Figure 3
a side view of the piston in the direction of the piston pin axis.

Die Figuren zeigen einen Leichtmetallkolben mit einem dachförmigen Kolbenboden 2 mit einer Brennraummulde 4. An den Kolbenboden 2 schließt sich ein das Ringfeld 6 bildender Umfangsabschnitt 8 an. Der einteilige Kolben umfasst zwei Gleitflächen 10 bildende Schaftwandabschnitte 12, die sich an den das Ringfeld 6 bildenden Abschnitt 8 anschließen und über Bolzennaben 14 bildende insgesamt mit dem Bezugszeichen 16 versehene Verbindungswandabschnitte in Umfangsrichtung ineinander übergehen.The figures show a light metal piston with a roof-shaped piston head 2 with a combustion chamber trough 4. An the piston crown 2 encloses the ring field 6 forming circumferential section 8. The one-piece piston comprises two sliding wall sections 10 forming shaft wall sections 12 that form on the section 8 forming the ring field 6 connect and form a total of 14 pin hubs 16 connecting wall sections in FIG Merge circumferentially into one another.

Die Naben 14 sind derart zurückgesetzt, dass der Abstand der Nabenaußenflächen 18 voneinander 65 % des Kolbendurchmessers Dk aufweist. Wie aus der Figur 1 ersichtlich verlaufen die Nabeninnenflächen 20 trapezförmig, so dass sich die Naben in Richtung auf das freie Schaftende verjüngen. Durch die Zurücksetzung der Naben 14 bzw. der Nabenaußenflächen 18 entstehen in Umfangsrichtung auf Breite der Haben und senkrecht zur Kolbenbolzenachse x Freiräume für die Ausbildung eines im Wesentlichen senkrecht zur Kolbenbolzenachse x in Richtung auf den Kolbenboden 2 erstreckten Hohlraums 22. Die Hohlräume 22 überspannen in Umfangsrichtung ein Kreisbogensegment von 55°. Sie sind zur Kolbenbolzenlängsachse x symmetrisch ausgebildet. Die Nabenaußenflächen 18 gehen hinterschneidungsfrei und bündig in die Hohlräume 22 begrenzende Wandflächen 24 über. Die Höhe bzw. Tiefe der Hohlräume 22 in Kolbenlängsrichtung gemessen ist derart, dass sie sich bis zu der mit dem Bezugszeichen 26 in der Figur 1 angedeuteten Ebene erstrecken, welche durch die die obere Ringnut begrenzende Nutflanke 28 definiert ist.The hubs 14 are set back in such a way that the distance of the outer hub surfaces 18 from one another is 65% of the piston diameter D k . As can be seen from FIG. 1, the inner hub surfaces 20 are trapezoidal, so that the hubs taper in the direction of the free shaft end. By resetting the hubs 14 or the hub outer surfaces 18, in the circumferential direction on the width of the credits and perpendicular to the piston pin axis x, free spaces are created for the formation of a cavity 22 which extends essentially perpendicular to the piston pin axis x in the direction of the piston crown 2. The cavities 22 span in the circumferential direction a circular arc segment of 55 °. They are symmetrical to the longitudinal axis x of the piston pin. The hub outer surfaces 18 merge without undercuts and flush into the wall surfaces 24 delimiting the cavities 22. The height or depth of the cavities 22 measured in the longitudinal direction of the piston is such that they extend to the plane indicated by reference numeral 26 in FIG. 1, which is defined by the groove flank 28 delimiting the upper annular groove.

Die Schaftlänge Ls beträgt 42 % des Kolbendurchmessers Dk.The shaft length L s is 42% of the piston diameter D k .

Der Kolben ist aus einer Leichtmetalllegierung, vorzugsweise einer hochwarmfesten Aluminiumlegierung mit insbesondere 11 - 13 Gew.% Si, 3,3 - 4,2 Gew.% Cu, 1,8 - 2,5 Gew.% Ni hergestellt. Durch die vorstehend beschriebene Formgebung lässt sich die Kopflastigkeit des Kolbens durch Vorsehen der Hohlräume 22 reduzieren, so dass eine verhältnismäßig kurze Schaftlänge gewählt werden kann, ohne dass störende Laufgeräusche auftreten oder infolge verstärkter Kippbewegungen die Seitenkräfte auf die Zylinderwand und damit der Verschleiß erhöht wird. Auf die Geitflächen 10 bildenden Schaftwandabschnitte 12 ist zusätzlich eine die tribologischen Eigenschaften verbessernde Beschichtung 30 aufgebracht.The piston is made of a light alloy, preferably with a heat-resistant aluminum alloy especially 11-13% by weight Si, 3.3-4.2% by weight Cu, 1.8- 2.5 wt.% Ni produced. Through the one described above The top-heavyness of the piston can be shaped Provide cavities 22 reduce so that a relatively short shaft length can be chosen without that disturbing running noises occur or as a result increased tipping movements the lateral forces on the Cylinder wall and thus the wear is increased. On the Shaft wall sections 12 forming sliding surfaces 10 additionally the tribological properties improving coating 30 applied.

Claims (10)

Leichtmetallkolben für Brennkraftmaschinen mit einem dachförmigen Kolbenboden (2) mit einer Brennraummulde (4), dadurch gekennzeichnet, dass die Naben (14) in Bolzenachsenrichtung (x) derart zurückgesetzt sind, dass der äußere Nabenabstand 60 - 65 % des Kolbendurchmessers (Dk) oder weniger beträgt, und dass oberhalb der Außenflächen (18) der zurückgesetzten Naben (14) ein in Umfangsrichtung einen Winkel (α) zwischen 45 und 60° einschließender offener Hohlraum (22) vorgesehen ist, der sich in Richtung auf den Kolbenboden (2) in den Bereich hinter dem Ringfeld (6) hineinerstreckt, und dass die Nabeninnenflächen (20) trapezförmig oder stufenförmig abgesetzt ausgebildet sind, und die Schaftlänge (Ls) 40 - 45 % des Kolbendurchmessers (Dk) beträgt.Light metal pistons for internal combustion engines with a roof-shaped piston head (2) with a combustion chamber trough (4), characterized in that the hubs (14) are set back in the direction of the pin axis (x) in such a way that the outer hub distance is 60-65% of the piston diameter (D k ) or less, and that above the outer surfaces (18) of the recessed hubs (14) there is an open cavity (22) enclosing an angle (α) between 45 and 60 ° in the circumferential direction, which in the direction of the piston head (2) in the area behind the ring field (6), and that the inner hub surfaces (20) are trapezoidal or stepped, and the shaft length (L s ) is 40 - 45% of the piston diameter (D k ). Leichtmetallkolben nach Anspruch 1, dadurch gekennzeichnet, dass die Innenflächen (20) der Naben (14) unter einem Winkel von 10 - 15° zur Kolbenlängsachse geneigt verlaufen.Light metal piston according to claim 1, characterized characterized in that the inner surfaces (20) of the hubs (14) at an angle of 10-15 ° to the The longitudinal axis of the piston is inclined. Leichtmetallkolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich die Hohlräume (22) bis über die Ebene (26) der die obere Ringnut begrenzenden Nutoberflanke (28) erstrecken.Light metal piston according to claim 1 or 2, characterized characterized in that the cavities (22) over the plane (26) of the upper annular groove delimiting Extend groove top flank (28). Leichtmetallkolben nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Tiefe der Hohlräume (22) ausgehend von der durch Kolbenbolzenachse und Kolbenlängsachse gebildeten Ebene in Umfangsrichtung nach beiden Richtungen hin abnimmt.Light metal piston according to claim 1, 2 or 3, characterized characterized in that the depth of the cavities (22) starting from the through piston pin axis and Piston longitudinal axis formed plane in the circumferential direction decreases in both directions. Leichtmetallkolben nach Anspruch 4, dadurch gekennzeichnet, dass die Tiefe der Hohlräume (22) entsprechend der Neigung der Dachform des Kolbenbodens (2) abnimmt.Light metal piston according to claim 4, characterized characterized in that the depth of the cavities (22) according to the slope of the roof shape of the piston crown (2) decreases. Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Außenflächen (18) der Naben bündig in den Hohlraum (22) begrenzende Wandflächen (24) übergehen.Light metal piston according to one of the preceding Claims, characterized in that the Outer surfaces (18) of the hubs are flush with the cavity (22) delimiting wall surfaces (24). Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Außenflächen (18) der Naben (14) in Richtung auf den Kolbenboden (2) hinterschneidungsfrei in den Hohlraum (22) begrenzende Wandflächen (24) übergehen. Light metal piston according to one of the preceding Claims, characterized in that the Outer surfaces (18) of the hubs (14) towards the Piston plate (2) without undercuts in the cavity (22) delimiting wall surfaces (24). Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass Gleitflächen (10) bildende Abschnitte (12) des Kolbenschafts eine die tribologischen Eigenschaften verbessernde Beschichtung (30) aufweisen.Light metal piston according to one of the preceding Claims, characterized in that sliding surfaces (10) forming sections (12) of the piston skirt improving the tribological properties Have coating (30). Leichtmetallkolben nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass er aus einer Aluminiumlegierung mit 11 - 13 Gew.% Si, 3,3 - 4,2 Gew.% Cu und 1,8 - 2,5 Gew.% Ni gegossen ist.Light metal piston according to one of the preceding Claims characterized in that it consists of a Aluminum alloy with 11-13 wt.% Si, 3.3-4.2 % By weight of Cu and 1.8-2.5% by weight of Ni is cast. Leichtmetallkolben nach Anspruch 9, dadurch gekennzeichnet, dass er im Kokillengießverfahren hergestellt ist.Light metal piston according to claim 9, characterized characterized that he uses the mold casting process is made.
EP98117145A 1997-09-12 1998-09-10 Lightweight metal piston for an internal combustion engine Expired - Lifetime EP0902180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19740065 1997-09-12
DE19740065A DE19740065A1 (en) 1997-09-12 1997-09-12 Light alloy pistons for internal combustion engines

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EP0902180A2 true EP0902180A2 (en) 1999-03-17
EP0902180A3 EP0902180A3 (en) 1999-12-15
EP0902180B1 EP0902180B1 (en) 2002-11-13

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Cited By (5)

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EP1236874A2 (en) * 2001-02-28 2002-09-04 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
DE10145589A1 (en) * 2001-09-15 2003-04-24 Ks Kolbenschmidt Gmbh Piston for IC engine has shaft with connection walls with convex lower edge and concave upper edge and curved central section
EP1338782A1 (en) * 2002-02-22 2003-08-27 General Motors Corporation Combustion chamber for reverse tumble spark ignition direct injection engine
EP1561938A1 (en) * 2004-02-06 2005-08-10 Yamaha Hatsudoki Kabushiki Kaisha Piston for an Internal combustion engine
JP2009506259A (en) * 2005-08-29 2009-02-12 カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング Lightweight piston

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Publication number Priority date Publication date Assignee Title
DE102013009415A1 (en) * 2013-06-05 2014-12-11 Man Diesel & Turbo Se Piston of an internal combustion engine
WO2017025608A1 (en) * 2015-08-11 2017-02-16 Ks Kolbenschmidt Gmbh Piston for an internal combustion engine
US10865734B2 (en) 2017-12-06 2020-12-15 Ai Alpine Us Bidco Inc Piston assembly with offset tight land profile

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US5562074A (en) * 1994-09-30 1996-10-08 Dr.Ing. H.C.F. Porsche Ag Piston for internal-combustion engines

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DE4210056A1 (en) * 1992-03-27 1993-09-30 Mahle Gmbh Reciprocating piston of an internal combustion engine
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EP1236874A2 (en) * 2001-02-28 2002-09-04 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
EP1236874B1 (en) * 2001-02-28 2007-06-06 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
DE10145589A1 (en) * 2001-09-15 2003-04-24 Ks Kolbenschmidt Gmbh Piston for IC engine has shaft with connection walls with convex lower edge and concave upper edge and curved central section
DE10145589B4 (en) * 2001-09-15 2006-09-14 Ks Kolbenschmidt Gmbh Piston for an internal combustion engine
EP1338782A1 (en) * 2002-02-22 2003-08-27 General Motors Corporation Combustion chamber for reverse tumble spark ignition direct injection engine
US6745745B2 (en) 2002-02-22 2004-06-08 General Motors Corporation Combustion chamber for reverse tumble spark ignition direct injection engine
EP1561938A1 (en) * 2004-02-06 2005-08-10 Yamaha Hatsudoki Kabushiki Kaisha Piston for an Internal combustion engine
JP2009506259A (en) * 2005-08-29 2009-02-12 カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング Lightweight piston

Also Published As

Publication number Publication date
EP0902180A3 (en) 1999-12-15
DE19740065A1 (en) 1999-03-18
DE59806259D1 (en) 2002-12-19
EP0902180B1 (en) 2002-11-13

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