EP2188513B1 - Two-piece piston for an internal combustion engine - Google Patents

Two-piece piston for an internal combustion engine Download PDF

Info

Publication number
EP2188513B1
EP2188513B1 EP08801217.4A EP08801217A EP2188513B1 EP 2188513 B1 EP2188513 B1 EP 2188513B1 EP 08801217 A EP08801217 A EP 08801217A EP 2188513 B1 EP2188513 B1 EP 2188513B1
Authority
EP
European Patent Office
Prior art keywords
piston
ring element
solder connection
radially
ring
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.)
Active
Application number
EP08801217.4A
Other languages
German (de)
French (fr)
Other versions
EP2188513A1 (en
Inventor
Jochen Kortas
Timo Estrum
Dieter Messmer
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2188513A1 publication Critical patent/EP2188513A1/en
Application granted granted Critical
Publication of EP2188513B1 publication Critical patent/EP2188513B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02F2003/0038—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by brazing

Definitions

  • the invention relates to a two-part piston for an internal combustion engine according to the preamble of claim 1.
  • DE-OS 24 34 902 is a multi-part piston for an internal combustion engine which has a base body, on the underside of two pin bosses are formed. On the underside of the body is connected to a piston skirt and on the top radially outward with a ring member. It is known from the above DE-OS also, for connecting the main body to the piston skirt and with the ring member a Lötsch Strukturbericht, ie, to use a brazing method. In this case, the ring element has a first solder joint on the radial inner side of the part of the piston crown formed by the ring element. Since both the part of the piston crown formed by the main body and by the ring element are very thin-walled, there is the disadvantage that the solder joint also has a very small axial length and thus a very low strength.
  • the ring element On the side facing away from the piston crown, the ring element is also connected to the base body via a relatively long, lower solder joint seen in the radial direction. If in this case the piston crown due to a pressure load due to the taking place in the combustion chamber cavity, explosive combustion of the fuel-air mixture and because of prevailing in the region of the piston crown, very high temperatures in the radial direction partly pressure and partly due to temperature expands, the ring element widened funnel-shaped, and the lower solder joint is subjected to a large tensile load.
  • the known from the prior art piston has the disadvantage that in the area of the lower solder joint no constructive measures are provided to reduce this tensile load on the lower solder joint.
  • Fig. 1 shows a piston 1 in an exploded view, which consists of a piston body 2 and a ring element 3.
  • the piston body 2 and the ring member 3 are made of AFP steel, ie, from a micro-alloyed, precipitation hardening, ferritic-pearlitic manganese-vanadium-based steel according to DIN EN 10267.
  • the piston body 2 and the ring member 3 are used in the assembly of the Soldered piston 1 with each other.
  • the ring member 3 forms the essential part of the annular piston crown 4 and has on its radial outer side a ring portion 5 to Recording in the figure not shown piston rings.
  • a round opening 7 is introduced, which is bounded near the piston head 4 by a first, cylindrical surface 8, which serves as a soldering surface during assembly of the piston 1.
  • the piston main body 2 consists of a substantially plate-shaped and round center part 9, on its underside facing away from the piston bottom 4, two opposing shaft elements 10 and two opposing and this shaft elements 10 interconnecting pin bosses 11 are formed.
  • the radially outer end faces 12 of the pin bosses 11 are set back relative to the radially outer boundary 13 of the middle part 9 in the direction of the piston axis 6.
  • a peripheral, channel-shaped recess 14 is formed radially outwardly, surrounded by a circumferential inner annular rib 15 arranged radially on the upper side of the middle part 9, the interior of which forms the combustion recess 16 of the piston 1.
  • the annular rib 15 and the combustion bowl 16 are not rotationally symmetrical to the piston axis 6, but have radially outward a dent 17 whose purpose is to improve the combustion of the fuel-air mixture in the combustion bowl 16.
  • the piston crown side, the boundary of the annular rib 15 is circular, so that a part of the piston head 4 'is formed thereof.
  • a radially outer, second cylindrical surface 18 is also formed, which also serves as a counterpart to the first surface 8 of the ring member 3 as a soldering surface and with the surface 8 an upper solder joint (23, see Fig. 3 ) between the ring member 3 and the piston body 2 forms.
  • the middle part 9 has on its upper side an annular, third surface 19, which serves as a soldering surface and with an in Fig. 1 not shown, on the lower end face of the ring member 3, fourth and also serving as a soldering surface 20 forms a lower solder joint between the ring member 3 and the piston body 2. (See also this Fig. 3 .)
  • Fig. 3 illustrated section through the piston along the piston axis 6 and the line III-III in Fig. 2 shows a radially outside of the ring member 3, radially inwardly of the annular rib 15 and bottom of the recess 14 of the central part 9 of the piston body 2 limited, annular, cooling channel 21, not shown in the figure and opening into the piston interior 22 ⁇ lzurios- and ⁇ labzhoukanäle , Shown are also formed by the first and second surfaces 8 and 18, axially aligned, upper solder joint 23 and formed by the third and fourth surfaces 19 and 20, radially oriented, lower solder joint 24 between the piston body 2 and the ring member third
  • the first surface 8 in this case represents the radially inner boundary of the piston crown 4 forming deck portion 25 of the ring member 3, wherein in the piston bottom side facing away from the deck area 25 an upwardly directed, circumferential recess 26 is formed, here a peripheral, upper, thinned wall area 49 forms.
  • the ratio between the length b of the upper solder joint 23 and the minimum thickness a of the upper thinned wall portion 49 is between 1 and 3, that is, 1 ⁇ b / a ⁇ 3.
  • the fourth surface 20 which forms the lower end face of the ring element 3
  • the recess 27 is disposed between the ring portion 5 and the lower solder joint 24.
  • Fig. 4 is an embodiment of the piston 1 'in the region of the cooling channel 21' shown, in which the upper deck portion 25 'of the ring member 3 "in the region of the upper, thinned wall portion 49 radially inward only extends to the region of lowest wall thickness a and here a radial inner, cylindrical surface 31 forms, which forms an upper solder joint 32 with a radially outer, cylindrical surface 29 of a piston crown side integrally formed on the annular rib 15, circumferential and radially outwardly directed collar 30.
  • the surface 29 is delimited by a step-shaped circumferential molding 34 on which the radially inner end of the cover region 25 'rests.
  • the recesses 47 and 48 are arranged between the lower solder joint 33 and the ring portion 5. .
  • Fig. 5 shows an embodiment of the piston 1 ", in which the solder joint 24 'of the conically downwardly tapering, lower end face 37 of the ring member 3' and of the conically tapering down surface 38 is formed, wherein the surface 38 is the radially outer Area of the central part 9 "limited piston bottom side.
  • the piston 1 according to the invention is produced by first forging a blank 39 for the piston main body 2 and a blank 40 for the ring element 3, as described in US Pat Fig. 6 are shown in which the two blanks 39 and 40 are shown hatched, and in the piston 1 ultimately produced from this is shown in dashed lines within the hatched area.
  • the ring member 3 can also be made by the method of rolling or drawing.
  • the piston bottom side, radially inner edge of the blank 40 with a chamfer 41 and the piston bottom side, radially outer edge of the blank 39 are provided with a chamfer 42, which, like Fig. 6 shows, a wedge-shaped in section, circumferential recess 43 result when the two blanks 39 and 40 are assembled.
  • a circumferential, in section at least approximately rectangular projection 44 is integrally formed. Both the recess 43 and the projection 44 have in the context of the joining of the two blanks by means of the Lot explained below in more detail purpose.
  • the two blanks 39 and 40 are soldered together.
  • a gap with this width is already achieved in that both the surfaces 8 and 18 and the surface 19 and 20 are brought into contact with each other without positive locking.
  • the recess 43 and the piston bottom side surface of the projection 44 are then coated with a nickel-based solder paste, after which the two blanks 39, 40 including solder paste are heated to 1150 ° C.
  • the solder paste liquefies here and penetrates due to the capillary effect between the surfaces 8 and 18 and the surfaces 19 and 20, wherein the liquefied solder enforces a gap with the above dimensions between the surfaces 8 and 18 and between the surfaces 19 and 20 due to the capillary action.
  • the surfaces 8, 18, 19 and 20 are completely wetted.
  • the solder paste solidifies and results in a defect-free solder joint between the two partially processed blanks 39 and 40.
  • the gap between the surfaces 29 and 31 of the upper solder joint 32 of 10 .mu.m to 200 .mu.m which is sufficient for an error-free solder connection is achieved by machining the surfaces 29 and 31 by means of a fine-turning method insofar as the gap between the two surfaces 29 and 31 having the above dimensions of 10 .mu.m to 200 .mu.m, after the collar 36 is fixed in the recess 35 with close clearance.
  • the Anformung 34 on which passes in the assembly of the piston 1 'of the cover portion 25' of the ring member 3 "to the plant, here ensures that the piston crown side end face 51 of the collar 36 and the shaft-side inner surface 52 of the recess 35 after the piston assembly a distance from 10 .mu.m to 200 .mu.m apart from each other, so that here too results in a sufficiently wide gap for an error-free solder joint.
  • the application of the soldering method for connecting the two piston parts has the advantage that the soldering temperature of 1150 ° C, to which the piston is heated in this case, is equal to the forging temperature, with which the two blanks 39 and 40 are forged so that when cooling specifically can be adjusted for the AFP steel typical material properties.
  • the piston 1 is completed by the in Fig. 6 dashed lines, rotationally symmetrical outer contours of the piston 1 by turning and also dashed lines, non-rotationally symmetrical boundary surfaces 46 of the combustion bowl 16 are made by milling. In this case it is also possible to weld the piston base body 2, 2 ', 2 "and the ring element 3, 3', 3" together.

Description

Die Erfindung betrifft einen zweiteiligen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1.The invention relates to a two-part piston for an internal combustion engine according to the preamble of claim 1.

Aus der Offenlegungsschrift DE-OS 24 34 902 ist ein mehrteiliger Kolbe für einen Verbrennungsmotor bekannt, der einen Grundkörper aufweist, an dessen Unterseite zwei Bolzennaben angeformt sind. Auf der Unterseite ist der Grundkörper mit einem Kolbenschaft und auf der Oberseite radial außen mit einem Ringelement verbunden. Bekannt ist aus obigerer DE-OS auch, zum Verbinden des Grundkörpers mit dem Kolbenschaft und mit dem Ringelement ein Lötschweißverfahren, d.h., ein Hartlötverfahren anzuwenden. Hierbei weist das Ringelement eine erste Lötverbindung auf der radialen Innenseite des vom Ringelement gebildeten Teiles des Kolbenbodens auf. Da sowohl der vom Grundkörper als auch der vom Ringelement gebildete Teil des Kolbenbodens sehr dünnwandig sind, ergibt sich der Nachteil, dass auch die Lötverbindung eine sehr geringe axiale Länge und damit eine sehr geringe Festigkeit aufweist.From the publication DE-OS 24 34 902 is a multi-part piston for an internal combustion engine is known which has a base body, on the underside of two pin bosses are formed. On the underside of the body is connected to a piston skirt and on the top radially outward with a ring member. It is known from the above DE-OS also, for connecting the main body to the piston skirt and with the ring member a Lötschweißverfahren, ie, to use a brazing method. In this case, the ring element has a first solder joint on the radial inner side of the part of the piston crown formed by the ring element. Since both the part of the piston crown formed by the main body and by the ring element are very thin-walled, there is the disadvantage that the solder joint also has a very small axial length and thus a very low strength.

Ein ähnlicher Kolben ist aus GB 2 163 072 bekannt.A similar piston is out GB 2 163 072 known.

Auf der dem Kolbenboden abgewandten Seite ist das Ringelement zudem über eine in radialer Richtung gesehen relativ lange, untere Lötverbindung mit dem Grundkörper verbunden. Wenn sich hierbei der Kolbenboden aufgrund einer Druckbelastung wegen der in der Brennraummulde stattfindenden, explosionsartigen Verbrennung des Kraftstoff-Luft-Gemisches und wegen der im Bereich des Kolbenbodens herrschenden, sehr hohen Temperaturen in radialer Richtung teils druck- und teils temperaturbedingt ausdehnt, weitete sich das Ringelement trichterförmig auf, und die untere Lötverbindung wird einer großen Zugbelastung ausgesetzt. Der aus dem vorliegenden Stand der Technik bekannte Kolben hat den Nachteil, dass im Bereich der unteren Lötverbindung keine konstruktiven Maßnahmen vorgesehen sind, um diese Zugbelastung auf die untere Lötverbindung zu verringern.On the side facing away from the piston crown, the ring element is also connected to the base body via a relatively long, lower solder joint seen in the radial direction. If in this case the piston crown due to a pressure load due to the taking place in the combustion chamber cavity, explosive combustion of the fuel-air mixture and because of prevailing in the region of the piston crown, very high temperatures in the radial direction partly pressure and partly due to temperature expands, the ring element widened funnel-shaped, and the lower solder joint is subjected to a large tensile load. The known from the prior art piston has the disadvantage that in the area of the lower solder joint no constructive measures are provided to reduce this tensile load on the lower solder joint.

Diese Nachteile des Stand der Technik zu vermeiden, ist Aufgabe der Erfindung. Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.To avoid these disadvantages of the prior art is an object of the invention. This problem is solved with the features in the characterizing part of the main claim. Advantageous embodiments of the invention are the subject of the dependent claims.

Hierbei werden bei einer trichterförmigen Aufweitung des Ringelementes nahe den Lötverbindungen angeordnete, verdünnte, umlaufende Wandbereiche schamierartig verformt, was eine erheblich Verringerung der im Motorbetrieb auf die Lötverbindungen einwirkende Zugspannung mit sich bringt.Here, in a funnel-shaped widening of the ring element near the solder joints arranged, dilute, circumferential wall portions are deformed like a sham, which brings a significant reduction in the force acting on the braze joints in engine operation with it.

Einige Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Zeichnungen beschrieben. Es zeigen

Fig. 1
eine Explosionsdarstellung des Kolbens gemäß der Erfindung, bestehend aus einem Kolbengrundkörper und einem Ringelement,
Fig. 2
eine perspektivische Darstellung des erfindungsgemäßen Kolbens nach dessen Montage,
Fig. 3
einen Schnitt durch den Kolben entlang der Kolbenachse und der Linie III-III in Fig. 2,
Fig. 4
einen Teilschnitt durch den Kolben im Bereich des Kühlkanals zur Darstellung einer Ausgestaltung der Lötverbindungen,
Fig. 5
einen Teilschnitt durch den Kolben im Bereich des Kühlkanals zur Darstellung einer weiteren Ausgestaltung einer der Lötverbindungen und
Fig. 6
einen Teilschnitt durch den Kolbenrohling im Bereich des Kühlkanals.
Some embodiments of the invention will be described below with reference to the drawings. Show it
Fig. 1
an exploded view of the piston according to the invention, consisting of a piston body and a ring element,
Fig. 2
a perspective view of the piston according to the invention after its assembly,
Fig. 3
a section through the piston along the piston axis and the line III-III in Fig. 2 .
Fig. 4
a partial section through the piston in the region of the cooling channel to illustrate an embodiment of the solder joints,
Fig. 5
a partial section through the piston in the region of the cooling channel to illustrate a further embodiment of the solder joints and
Fig. 6
a partial section through the piston blank in the region of the cooling channel.

Fig. 1 zeigt einen Kolben 1 in Explosionsdarstellung, der aus einem Kolbengrundkörper 2 und einem Ringelement 3 besteht. Der Kolbengrundkörper 2 und das Ringelement 3 sind aus AFP-Stahl gefertigt, d.h., aus einem mikrolegierten, ausscheidungshärtenden, ferritisch-perlitischen Stahl auf Mangan-Vanadin-Basis nach DIN EN 10267. Der Kolbengrundkörper 2 und das Ringelement 3 werden im Rahmen der Montage des Kolbens 1 miteinander verlötet. Fig. 1 shows a piston 1 in an exploded view, which consists of a piston body 2 and a ring element 3. The piston body 2 and the ring member 3 are made of AFP steel, ie, from a micro-alloyed, precipitation hardening, ferritic-pearlitic manganese-vanadium-based steel according to DIN EN 10267. The piston body 2 and the ring member 3 are used in the assembly of the Soldered piston 1 with each other.

Das Ringelement 3 bildet den wesentlichen Teil des ringförmig ausgebildeten Kolbenbodens 4 und weist auf seiner radialen Außenseite eine Ringpartie 5 zur Aufnahme in der Figur nicht dargestellter Kolbenringe auf. In das Ringelement 3 ist mittig und rotationssymmetrisch zur Kolbenachse 6 eine rund Öffnung 7 eingebracht, die nahe dem Kolbenboden 4 von einer ersten, zylinderförmigen Fläche 8 begrenzt wird, die bei der Montage des Kolbens 1 als Lötfläche dient.The ring member 3 forms the essential part of the annular piston crown 4 and has on its radial outer side a ring portion 5 to Recording in the figure not shown piston rings. In the ring member 3 is centrally and rotationally symmetrical to the piston axis 6, a round opening 7 is introduced, which is bounded near the piston head 4 by a first, cylindrical surface 8, which serves as a soldering surface during assembly of the piston 1.

Der Kolbengrundkörper 2 besteht aus einem im Wesentlichen plattenförmigen und runden Mittenteil 9, an dessen dem Kolbenboden 4 abgewandte Unterseite zwei einander gegenüberliegende Schaftelemente 10 und zwei einander gegenüberliegende und diese Schaftelemente 10 miteinander verbindende Bolzennaben 11 angeformt sind. Die radial äußeren Stirnseiten 12 der Bolzennaben 11 sind gegenüber der radial äußeren Begrenzung 13 des Mittenteils 9 in Richtung der Kolbenachse 6 zurückgesetzt.The piston main body 2 consists of a substantially plate-shaped and round center part 9, on its underside facing away from the piston bottom 4, two opposing shaft elements 10 and two opposing and this shaft elements 10 interconnecting pin bosses 11 are formed. The radially outer end faces 12 of the pin bosses 11 are set back relative to the radially outer boundary 13 of the middle part 9 in the direction of the piston axis 6.

In die Oberseite des Mittenteils 9 ist radial außen eine umlaufende, kanalförmige Ausnehmung 14 eingeformt, von der eine radial innen liegende und auf der Oberseite des Mittenteils 9 angeordnete, umlaufende Ringrippe 15 umgeben ist, deren Innenraum die Verbrennungsmulde 16 des Kolbens 1 bildet.In the upper side of the middle part 9, a peripheral, channel-shaped recess 14 is formed radially outwardly, surrounded by a circumferential inner annular rib 15 arranged radially on the upper side of the middle part 9, the interior of which forms the combustion recess 16 of the piston 1.

Im vorliegenden Ausführungsbeispiel des Kolbens 1 sind die Ringrippe 15 und die Verbrennungsmulde 16 nicht rotationssymmetrisch zur Kolbenachse 6 ausgebildet, sondern weisen radial außen eine Eindellung 17 auf, deren Zweck darin besteht, die Verbrennung des Kraftstoff-Luft-Gemisches in der Verbrennungsmulde 16 zu verbessern.In the present embodiment of the piston 1, the annular rib 15 and the combustion bowl 16 are not rotationally symmetrical to the piston axis 6, but have radially outward a dent 17 whose purpose is to improve the combustion of the fuel-air mixture in the combustion bowl 16.

Kolbenbodenseitig ist die Begrenzung der Ringrippe 15 kreisförmig ausgebildet, sodass hiervon ein Teil des Kolbenbodens 4' gebildet wird. Hiervon wird zudem eine radial außen liegende, zweite zylinderförmige Fläche 18 gebildet, die als Gegenstück zur ersten Fläche 8 des Ringelementes 3 ebenfalls als Lötfläche dient und mit der Fläche 8 eine obere Lötverbindung (23, siehe Fig. 3) zwischen dem Ringelement 3 und dem Kolbengrundkörper 2 bildet.The piston crown side, the boundary of the annular rib 15 is circular, so that a part of the piston head 4 'is formed thereof. Of this, a radially outer, second cylindrical surface 18 is also formed, which also serves as a counterpart to the first surface 8 of the ring member 3 as a soldering surface and with the surface 8 an upper solder joint (23, see Fig. 3 ) between the ring member 3 and the piston body 2 forms.

Radial außen weist das Mittenteil 9 auf seiner Oberseite eine ringförmige, dritte Fläche 19 auf, die als Lötfläche dient und mit einer in Fig. 1 nicht dargestellten, auf der unteren Stirnseite des Ringelementes 3 angeordneten, vierten und ebenfalls als Lötfläche dienender Fläche 20 eine untere Lötverbindung zwischen dem Ringelement 3 und dem Kolbengrundkörper 2 bildet. (Siehe auch hierzu Fig. 3.)Radially outward, the middle part 9 has on its upper side an annular, third surface 19, which serves as a soldering surface and with an in Fig. 1 not shown, on the lower end face of the ring member 3, fourth and also serving as a soldering surface 20 forms a lower solder joint between the ring member 3 and the piston body 2. (See also this Fig. 3 .)

Ist das Ringelement 3 auf den Kolbengrundkörper 2 aufgesetzt und damit verlötet, ergibt sich der in Fig. 2 dargestellte Kolben 1, der den Kolbenboden 4, 4', die Verbrennungsmulde 16, die Ringpartie 5, ein Schaftelement 10 und eine Bolzennabe 11 erkennen lässt.Is the ring member 3 placed on the piston body 2 and soldered with it, resulting in the Fig. 2 illustrated piston 1, the piston bottom 4, 4 ', the combustion bowl 16, the ring section 5, a shaft member 10 and a pin boss 11 can recognize.

Der in Fig. 3 dargestellte Schnitt durch den Kolben entlang der Kolbenachse 6 und der Linie III-III in Fig. 2 zeigt einen radial außen vom Ringelement 3, radial innen von der Ringrippe 15 und unten von der Ausnehmung 14 des Mittelteils 9 des Kolbengrundkörpers 2 begrenzten, ringförmigen, Kühlkanal 21, der in der Figur nicht dargestellte und in den Kolbeninnenraum 22 mündende Ölzuführ- und Ölabführkanäle aufweist. Dargestellt sind auch die von der ersten und zweiten Fläche 8 und 18 gebildete, axial ausgerichtete, obere Lötverbindung 23 und die von der dritten und vierten Fläche 19 und 20 gebildete, radial ausgerichtete, untere Lötverbindung 24 zwischen dem Kolbengrundkörper 2 und dem Ringelement 3.The in Fig. 3 illustrated section through the piston along the piston axis 6 and the line III-III in Fig. 2 shows a radially outside of the ring member 3, radially inwardly of the annular rib 15 and bottom of the recess 14 of the central part 9 of the piston body 2 limited, annular, cooling channel 21, not shown in the figure and opening into the piston interior 22 Ölzuführ- and Ölabführkanäle , Shown are also formed by the first and second surfaces 8 and 18, axially aligned, upper solder joint 23 and formed by the third and fourth surfaces 19 and 20, radially oriented, lower solder joint 24 between the piston body 2 and the ring member third

Die erste Fläche 8 stellt hierbei die radial innere Begrenzung des den Kolbenboden 4 bildenden Deckbereiches 25 des Ringelementes 3 dar, wobei in die kolbenbodenabgewandte Seite des Deckbereiches 25 eine nach oben gerichtete, umlaufende Ausnehmung 26 eingeformt ist, die hier einen umlaufenden, oberen, verdünnten Wandbereich 49 bildet. Hierbei liegt das Verhältnis zwischen der Länge b der oberen Lötverbindung 23 und der minimalen Dicke a des oberen, verdünnten Wandbereiches 49 zwischen 1 und 3, d.h., 1<b/a<3.The first surface 8 in this case represents the radially inner boundary of the piston crown 4 forming deck portion 25 of the ring member 3, wherein in the piston bottom side facing away from the deck area 25 an upwardly directed, circumferential recess 26 is formed, here a peripheral, upper, thinned wall area 49 forms. Here, the ratio between the length b of the upper solder joint 23 and the minimum thickness a of the upper thinned wall portion 49 is between 1 and 3, that is, 1 <b / a <3.

Kolbenbodenseitig schließt sich an die vierte Fläche 20, die die untere Stirnseite des Ringelementes 3 bildet, eine weitere, in die radiale Innenseite des Ringelementes 3 eingeformte und nach radial außen gerichtete, umlaufende Ausnehmung 27 an, die hier einen unteren, umlaufenden, verdünnten Wandbereich 50 bildet, wobei das Verhältnis zwischen der Länge c der unteren Lötverbindung 24 und der minimalen Dicke d des unteren, verdünnten Wandbereiches 50 ebenfalls zwischen 1 und 3 liegt, d.h., 1<c/d<3. Die Ausnehmung 27 ist zwischen der Ringpartie 5 und der unteren Lötverbindung 24 angeordnet.On the piston crown side adjoins the fourth surface 20, which forms the lower end face of the ring element 3, another, formed in the radial inner side of the ring member 3 and directed radially outward, circumferential recess 27, here a lower, circumferential, thinned wall portion 50th wherein the ratio between the length c of the lower solder joint 24 and the minimum thickness d of the lower, thinned wall portion 50 is also between 1 and 3, ie, 1 <c / d <3. The recess 27 is disposed between the ring portion 5 and the lower solder joint 24.

Bei einer Temperatur- und/oder Druckbelastung des Kolbens 1, 1', 1" ergibt sich, wie es in Fig. 5 zur Verdeutlichung des Sachverhaltes vergrößert dargestellt ist, eine Aufweitung 28 des oberen Teiles des Kolbens 1, 1', 1". Die hierbei auf die Lötverbindungen 23, 24, 24' einwirkende Zugbelastung wird von den verdünnten und damit elastisch nachgiebigen Bereiche des Ringelementes 3, 3', die von den Ausnehmungen 26 und 27 gebildeten werden, und die sich bei der Aufweitung 28 des Kolbenoberteils scharnierartige verformen, insoweit verringert, dass die Lötverbindungen 23, 24, 24' auch nach längerem Motorbetrieb halten.At a temperature and / or pressure load of the piston 1, 1 ', 1 "results, as it is in Fig. 5 an enlargement 28 of the upper part of the piston 1, 1 ', 1 "is shown enlarged to clarify the facts, the tensile load acting on the solder joints 23, 24, 24' being determined by the thinned and thus elastically yielding regions of the ring element 3, 3 ', which are formed by the recesses 26 and 27, and deform in the expansion 28 of the piston upper part hinge-like, reduced in that the solder joints 23, 24, 24' hold even after prolonged engine operation.

In Fig. 4 ist eine Ausgestaltung des Kolbens 1' im Bereich des Kühlkanals 21' dargestellt, bei der der obere Deckbereich 25' des Ringelementes 3" im Bereich des oberen, verdünnten Wandbereiches 49 radial innen nur bis zu dem Bereich der geringsten Wandstärke a reicht und hier eine radial innen liegende, zylinderförmige Fläche 31 bildet, die mit einer radial außen liegenden, zylinderförmigen Fläche 29 eines kolbenbodenseitig an die Ringrippe 15 angeformten, umlaufenden und nach radial außen gerichteten Kragens 30 eine obere Lötverbindung 32 bildet.In Fig. 4 is an embodiment of the piston 1 'in the region of the cooling channel 21' shown, in which the upper deck portion 25 'of the ring member 3 "in the region of the upper, thinned wall portion 49 radially inward only extends to the region of lowest wall thickness a and here a radial inner, cylindrical surface 31 forms, which forms an upper solder joint 32 with a radially outer, cylindrical surface 29 of a piston crown side integrally formed on the annular rib 15, circumferential and radially outwardly directed collar 30.

Auf der kolbenbodenabgewandten Seite wird die Fläche 29 von einer stufenförmigen, umlaufenden Anformung 34 begrenzt, auf der das radial innere Ende des Deckbereiches 25' aufliegt.On the side facing away from the piston crown, the surface 29 is delimited by a step-shaped circumferential molding 34 on which the radially inner end of the cover region 25 'rests.

Die kolbenbodenabgewandte Stirnseite 20' des Ringelementes 3" weist im Ausführungsbeispiel gemäß Fig. 4 radial innen eine umlaufende, stufenförmige Ausnehmung 35 auf, die so dimensioniert ist, dass sie auf einen kolbenbodenseitig auf der radial äußeren Begrenzung 13' des Mittenteils 9' angeformten, umlaufenden Kragen 36 passt, sodass beim Zusammenbau des Kolbens 1' das Ringelement 3" auf den Kragen 36 geschoben wird, bis der Kragen 36 in der Ausnehmung 35 sitzt, und der Deckbereich 25' des Ringelementes 3" auf der Anformung 34 zur Anlage gelangt. Eine untere Lötverbindung 33 wird im Bereich der kolbenbodenabgewandten Stirnseite 20' des Ringelementes 3" von der kolbenbodenseitigen Stirnfläche 51 des Kragens 36 und von der schaftseitigen Innenfläche 52 der Ausnehmung 35 gebildet.The piston bottom facing away from end face 20 'of the ring member 3 "in the embodiment according to Fig. 4 radially inside a circumferential, stepped recess 35 which is dimensioned so that it fits on a piston crown side on the radially outer boundary 13 'of the central part 9' integrally formed, circumferential collar 36, so that during assembly of the piston 1 'the ring member 3 "on the collar 36 is pushed until the collar 36 is seated in the recess 35, and the cover portion 25 'of the ring member 3 "on the Anformung 34 comes into abutment. A lower solder joint 33 is in the region of the end face facing away from the piston crown 20 'of the ring element 3 "formed by the piston bottom side end face 51 of the collar 36 and the shaft-side inner surface 52 of the recess 35.

Hierdurch wird erreicht, dass das Ringelement 3" beim Aufschieben auf den Kolbengrundkörper 2' nicht nur über die Flächen 29 und 31 der oberen Lötverbindung 32 geführt und zentriert wird, sondern dass bei der Montage des Kolbens 1' eine zusätzliche Führung und Zentrierung des Ringelementes 3" auch über die Ausnehmung 35 und den Kragen 36 der unteren Lötverbindung 33 erreicht wird.This ensures that the ring member 3 "when sliding on the piston body 2 'is not only guided and centered over the surfaces 29 and 31 of the upper solder joint 32, but that in the assembly of the piston 1' an additional guide and centering of the ring element. 3 is achieved via the recess 35 and the collar 36 of the lower solder joint 33.

Anstelle einer einzige, radial innen angeordneten Ausnehmung 27 gemäß dem in den Fig. 3 und 5 dargestellten Ausführungsbeispiel des Kolbens 1, 1" weist das Ausführungsbeispiel des Kolbens 1' gemäß Fig. 4 oberhalb der unteren Lötverbindung 33 sowohl auf der Innenseite als auch auf der Außenseite des Ringelementes 3" je eine umlaufende Ausnehmung 47 und 48 auf, die hier einen unteren, verdünnten Wandbereich 50' mit der Dicke d schaffen, der sich bei einer Aufweitung 28 des Kolbenoberteils (gemäß Fig. 5) scharnierartige verformt und damit die sich hierbei ergebende Zugbelastung auf die untere Lötverbindung 33 verringert. Die Ausnehmungen 47 und 48 sind zwischen der unteren Lötverbindung 33 und der Ringpartie 5 angeordnet. ,Instead of a single, radially inwardly disposed recess 27 according to the in the Fig. 3 and 5 illustrated embodiment of the piston 1, 1 ", the embodiment of the piston 1 'according to Fig. 4 above the lower solder joint 33 both on the inside and on the outside of the ring member 3 "per a circumferential recess 47 and 48, which here create a lower, thinned wall portion 50 'with the thickness d, resulting in a widening 28 of the piston upper part (according to Fig. 5 ) deforms hinge-like and thus reduces the resulting tensile load on the lower solder joint 33. The recesses 47 and 48 are arranged between the lower solder joint 33 and the ring portion 5. .

Fig. 5 zeigt eine Ausgestaltung des Kolbens 1", bei dem die Lötverbindung 24' von der konisch sich nach unten verjüngenden, unteren Stirnseite 37 des Ringelementes 3' und von der ebenfalls konisch sich nach unten verjüngenden Fläche 38 gebildet wird, wobei die Fläche 38 den radial äußeren Bereich des Mittenteils 9" kolbenbodenseitig begrenzt. Hierdurch wird eine Vergrößerung der Flächen 37 und 38 und damit eine Vergrößerung der unteren, konisch sich nach unten verjüngenden Lötverbindung 24' mit der Länge c erreicht, was zu einer weiteren Verbesserung der Festigkeit der unteren Lötverbindung 24' führt. Fig. 5 shows an embodiment of the piston 1 ", in which the solder joint 24 'of the conically downwardly tapering, lower end face 37 of the ring member 3' and of the conically tapering down surface 38 is formed, wherein the surface 38 is the radially outer Area of the central part 9 "limited piston bottom side. As a result, an enlargement of the surfaces 37 and 38 and thus an enlargement of the lower, tapered downwardly tapered solder joint 24 'is achieved with the length c, which leads to a further improvement in the strength of the lower solder joint 24'.

Hergestellt wird der erfindungsgemäße Kolben 1, indem zunächst ein Rohling 39 für den Kolbengrundkörper 2 und ein Rohling 40 für das Ringelement 3 geschmiedet werden, wie sie in Fig. 6 dargestellt sind, in der die beiden Rohlinge 39 und 40 schraffiert gezeichnet sind, und in der der letztlich hieraus hergestellte Kolben 1 innerhalb der schraffierten Fläche gestrichelt eingezeichnet ist. Das Ringelement 3 kann auch durch das Verfahren des Walzens oder des Ziehens hergestellt werden. Hierbei werden die kolbenbodenseitige, radial innere Kante des Rohlings 40 mit einer Fase 41 und die kolbenbodenseitige, radial äußere Kante des Rohlings 39 mit einer Fase 42 versehen, die, wie Fig. 6 zeigt, eine im Schnitt keilförmige, umlaufende Ausnehmung 43 ergeben, wenn die beiden Rohlinge 39 und 40 zusammengesetzt sind.The piston 1 according to the invention is produced by first forging a blank 39 for the piston main body 2 and a blank 40 for the ring element 3, as described in US Pat Fig. 6 are shown in which the two blanks 39 and 40 are shown hatched, and in the piston 1 ultimately produced from this is shown in dashed lines within the hatched area. The ring member 3 can also be made by the method of rolling or drawing. Here, the piston bottom side, radially inner edge of the blank 40 with a chamfer 41 and the piston bottom side, radially outer edge of the blank 39 are provided with a chamfer 42, which, like Fig. 6 shows, a wedge-shaped in section, circumferential recess 43 result when the two blanks 39 and 40 are assembled.

Weiterhin wird im Rahmen des Schmiedens des Rohlings 39 an die radial äußere, kolbenbodenseitige Kante der dritten Fläche 19 ein umlaufender, im Schnitt zumindest näherungsweise rechteckiger Vorsprung 44 angeformt. Sowohl die Ausnehmung 43 als auch der Vorsprung 44 haben im Rahmen des Verbindens der beiden Rohlinge mittels Lot den weiter unten näher erläuterten Zweck.Furthermore, as part of the forging of the blank 39 to the radially outer, piston bottom side edge of the third surface 19, a circumferential, in section at least approximately rectangular projection 44 is integrally formed. Both the recess 43 and the projection 44 have in the context of the joining of the two blanks by means of the Lot explained below in more detail purpose.

Im Anschluss daran werden in die radial äußere Fläche der Ringrippe 15 des Rohlings 39 und in die Oberfläche des Mittenteils 9 die insbesondere in Fig. 1 dargestellten rotationssymmetrischen Konturen eingedreht, wobei auch die Ausnehmung 14 hergestellt wird. Die in Fig. 1 dargestellte Eindellung 17 wird in die radiale Außenseite der Ringrippe 15 eingefräst. Durch Drehen werden dann auch die rotationssymmetrischen Konturen der radialen Innenfläche 45 des Ringelementes 3 und insbesondere die Ausnehmungen 26, 27, 47, 48 hergestellt.Following this, in the radially outer surface of the annular rib 15 of the blank 39 and in the surface of the central part 9 which in particular in Fig. 1 screwed shown rotationally symmetrical contours, wherein the recess 14 is made. In the Fig. 1 shown Eindellung 17 is milled into the radial outer side of the annular rib 15. By turning then the rotationally symmetrical contours of the radial inner surface 45 of the ring member 3 and in particular the recesses 26, 27, 47, 48 are made.

Im Anschluss daran werden die beiden Rohlinge 39 und 40 miteinander verlötet. Hierbei ist es zunächst erforderlich, die Rohlinge 39 und 40 so zusammenzusetzen, dass sich zwischen den Flächen 8 und 18 und zwischen den Fläche 19 und 20, jeweils ein Spalt ergibt, der zwischen 10 µm und 200 µm breit ist. Beim Zusammensetzen der Rohlinge 39 und 40 wird ein Spalt mit dieser Breite bereits dadurch erreicht, dass sowohl die Flächen 8 und 18 und die Fläche 19 und 20 ohne Formschluss miteinander in Kontakt gebracht werden.Following this, the two blanks 39 and 40 are soldered together. In this case, it is first necessary to assemble the blanks 39 and 40 in such a way that, between the surfaces 8 and 18 and between the surfaces 19 and 20, a gap results which is between 10 μm and 200 μm wide. When assembling the blanks 39 and 40, a gap with this width is already achieved in that both the surfaces 8 and 18 and the surface 19 and 20 are brought into contact with each other without positive locking.

Die Ausnehmung 43 und die kolbenbodenseitige Fläche des Vorsprungs 44 werden dann mit einer Lotpaste auf Nickelbasis bestrichen, wonach die beiden Rohlinge 39, 40 inklusive Lotpaste auf 1150 °C erhitzt werden. Die Lotpaste verflüssigt sich hierbei und dringt aufgrund des Kapillareffektes zwischen den Flächen 8 und 18 und den Flächen 19 und 20 ein, wobei sich das verflüssigte Lot einen Spalt mit den oben angegebenen Maßen zwischen den Flächen 8 und 18 und zwischen den Flächen 19 und 20 aufgrund der Kapillarwirkung erzwingt. Hierdurch werden die Flächen 8, 18, 19 und 20 komplett benetzt. Im Rahmen der daran erfolgenden, gezielten Abkühlung des Kolbens 1 verfestigt sich die Lotpaste und ergibt eine fehlerfreie Lötverbindung zwischen den beiden teilbearbeiteten Rohlingen 39 und 40.The recess 43 and the piston bottom side surface of the projection 44 are then coated with a nickel-based solder paste, after which the two blanks 39, 40 including solder paste are heated to 1150 ° C. The solder paste liquefies here and penetrates due to the capillary effect between the surfaces 8 and 18 and the surfaces 19 and 20, wherein the liquefied solder enforces a gap with the above dimensions between the surfaces 8 and 18 and between the surfaces 19 and 20 due to the capillary action. As a result, the surfaces 8, 18, 19 and 20 are completely wetted. As part of the targeted cooling of the piston 1, the solder paste solidifies and results in a defect-free solder joint between the two partially processed blanks 39 and 40.

Bei der Ausgestaltung des Kolbengrundkörpers 2' und des Ringelementes 3" gemäß Fig. 4 wird der für eine fehlerfreie Lötverbindung ausreichende Spalt zwischen den Flächen 29 und 31 der oberen Lötverbindung 32 von 10 µm bis 200 µm dadurch erreicht, dass die Flächen 29 und 31 mittels eines Feindrehverfahrens insoweit bearbeitet werden, dass der Spalt zwischen den beiden Flächen 29 und 31 die oben angegebenen Maße von 10 µm bis 200 µm aufweist, nachdem der Kragen 36 mit engem Spiel in der Ausnehmung 35 fixiert ist.In the embodiment of the piston main body 2 'and the ring element 3 "according to Fig. 4 the gap between the surfaces 29 and 31 of the upper solder joint 32 of 10 .mu.m to 200 .mu.m which is sufficient for an error-free solder connection is achieved by machining the surfaces 29 and 31 by means of a fine-turning method insofar as the gap between the two surfaces 29 and 31 having the above dimensions of 10 .mu.m to 200 .mu.m, after the collar 36 is fixed in the recess 35 with close clearance.

Die Anformung 34, auf der bei der Montage des Kolbens 1' der Deckbereich 25' des Ringelementes 3" zur Anlage gelangt, sorgt hierbei dafür, dass die kolbenbodenseitige Stirnfläche 51 des Kragens 36 und die schaftseitige Innenfläche 52 der Ausnehmung 35 nach der Kolbenmontage einen Abstand von 10 µm bis 200 µm voneinander aufweisen, sodass auch hier ein für eine fehlerfreie Lötverbindung ausreichend breiter Spalt ergibt.The Anformung 34 on which passes in the assembly of the piston 1 'of the cover portion 25' of the ring member 3 "to the plant, here ensures that the piston crown side end face 51 of the collar 36 and the shaft-side inner surface 52 of the recess 35 after the piston assembly a distance from 10 .mu.m to 200 .mu.m apart from each other, so that here too results in a sufficiently wide gap for an error-free solder joint.

Bei der Ausgestaltung des Kolbengrundkörpers 2" und des Ringelementes 3' gemäß Fig. 5 ergibt sich für eine sichere, oberen Lötverbindung 23 ein Spalt mit der konstanten Breite von 10 µm bis 200 µm zwischen den Flächen 8 und 18 dadurch, dass nach einer entsprechenden Feinbebarbeitung der Flächen 8 und 18 das Ringelement 3' über dessen konisch ausgerichtete, untere Stirnseite 37 auf die gleichermaßen konisch geformte, radial äußere, kolbenbodenseitige Stirnfläche 38 des Kolbengrundkörpers 2" aufgesetzt wird, wobei das Ringelement 3' alleine durch die Konizität der beiden Flächen 37 und 38 symmetrisch zur Kolbenachse ausgerichtet wird. Hierbei bewirkt der Kapillareffekt, dass das nach Erhitzen verflüssigte Lot in den Spalt zwischen den Flächen 37 und 28 eindringt, um auch diese Flächen sicher miteinander zu verlöten.In the embodiment of the piston main body 2 "and the ring member 3 'according to Fig. 5 results for a secure, upper solder joint 23, a gap with the constant width of 10 .mu.m to 200 .mu.m between the surfaces 8 and 18 in that after a corresponding Feinbebarbeitung the surfaces 8 and 18, the ring member 3 'on the conically oriented, lower end face 37 is placed on the equally conically shaped, radially outer, piston bottom side end face 38 of the piston main body 2 ", wherein the ring element 3 'is aligned symmetrically to the piston axis solely by the conicity of the two surfaces 37 and 38. The capillary effect causes this after heating liquefied solder in the Gap between the surfaces 37 and 28 penetrates to securely solder these surfaces together.

Die Anwendung des Lötverfahrens zum Verbinden der beiden Kolbenteile hat den Vorteil, dass die Löttemperatur von 1150 °C, auf die der Kolben hierbei erhitzt wird, gleich der Schmiedetemperatur ist, mit der die beiden Rohlinge 39 und 40 geschmiedet werden, sodass beim Abkühlen gezielt die für den AFP-Stahl typischen Werkstoffeigenschaften eingestellt werden können.The application of the soldering method for connecting the two piston parts has the advantage that the soldering temperature of 1150 ° C, to which the piston is heated in this case, is equal to the forging temperature, with which the two blanks 39 and 40 are forged so that when cooling specifically can be adjusted for the AFP steel typical material properties.

Im Anschluss daran wird der Kolben 1 fertiggestellt, indem die in Fig. 6 gestrichelt eingezeichneten, rotationssymmetrischen Außenkonturen des Kolbens 1 durch Drehen und die ebenfalls gestrichelt eingezeichneten, nicht-rotationssymmetrischen Begrenzungsflächen 46 der Verbrennungsmulde 16 durch Fräsen hergestellt werden. Hierbei ist es auch möglich, den Kolbengrundkörper 2, 2', 2" und das Ringelement 3, 3', 3" miteinander zu verschweißen.Subsequently, the piston 1 is completed by the in Fig. 6 dashed lines, rotationally symmetrical outer contours of the piston 1 by turning and also dashed lines, non-rotationally symmetrical boundary surfaces 46 of the combustion bowl 16 are made by milling. In this case it is also possible to weld the piston base body 2, 2 ', 2 "and the ring element 3, 3', 3" together.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

aa
Dicke des oberen, verdünnten Wandbereiches 49Thickness of upper, thinned wall area 49
bb
Länge der oberen LötverbindungLength of top solder joint
cc
Länge der unteren LötverbindungLength of the lower solder joint
dd
Dicke des unteren, verdünnten Wandbereiches 50, 50'Thickness of the lower, thinned wall area 50, 50 '
1, 1', 1"1, 1 ', 1 "
Kolbenpiston
2, 2', 2"2, 2 ', 2 "
KolbengrundkörperPiston base body
3, 3', 3"3, 3 ', 3 "
Ringelementring element
4, 4'4, 4 '
Kolbenbodenpiston crown
55
Ringpartiering belt
66
Kolbenachsepiston axis
77
Öffnungopening
88th
erste Flächefirst surface
9, 9', 9"9, 9 ', 9 "
Mittelteilmidsection
1010
Schaftelementshaft element
1111
Bolzennabepin boss
1212
Stirnseite der Bolzennabe 11Front side of the pin boss 11
13, 13'13, 13 '
Begrenzung des Mittenteils 9Limitation of the middle part 9
1414
Ausnehmungrecess
1515
Ringrippeannular rib
1616
Verbrennungsmuldecombustion bowl
1717
Eindellungdenting
1818
zweite Flächesecond surface
1919
dritte Flächethird area
20, 20'20, 20 '
vierte Flächefourth area
21, 21'21, 21 '
Kühlkanalcooling channel
2222
KolbeninnenraumPiston interior
2323
obere Lötverbindungupper solder joint
24, 24'24, 24 '
untere Lötverbindunglower solder joint
25, 25'25, 25 '
Deckbereichdeck area
26, 2726, 27
Ausnehmungrecess
2828
Aufweitungwidening
2929
Flächearea
3030
Kragencollar
3131
Flächearea
3232
obere Lötverbindungupper solder joint
3333
untere Lötverbindunglower solder joint
3434
Anformungconformation
3535
Ausnehmungrecess
3636
Kragencollar
3737
Fläche, untere Stirnseite des Ringelementes 3'Surface, lower end face of the ring element 3 '
3838
Fläche, StirnflächeSurface, face
3939
Rohling für den Kolbengrundkörper 2Blank for the piston body 2
4040
Rohling für das Ringelement 3Blank for the ring element 3
41, 4241, 42
Fasechamfer
4343
Ausnehmungrecess
4444
Vorsprunghead Start
4545
Innenfläche des Ringelementes 3Inner surface of the ring element 3rd
4646
Begrenzungsfläche der Verbrennungsmulde 16Boundary surface of the combustion bowl 16
47, 4847, 48
Ausnehmungrecess
4949
oberer, verdünnter Wandbereichupper, dilute wall area
50, 50'50, 50 '
unterer, verdünnter Wandbereichlower, dilute wall area
5151
kolbenbodenseitige Stirnfläche des Kragens 36piston-bottom-side end face of the collar 36
5252
schaftseitige Innenfläche der Ausnehmung 35shank-side inner surface of the recess 35

Claims (7)

  1. Two-piece piston (1, 1', 1") for an internal combustion engine,
    - consisting of a piston base body (2, 2', 2") and a ring element (3, 3', 3"),
    - whereby the piston base body (2, 2', 2") has a round, substantially plate-shaped centre part (9, 9', 9"), the radial diameter of which is at least approximately identical to the radial diameter of the piston (1, 1', 1"),
    - whereby, on the lower side of the centre part (9, 9', 9"), there are formed two skirt elements (10) lying opposite one another and two pin bosses (11) lying opposite one another and connecting the skirt elements (10) with one another, and
    - whereby, on the upper side of the centre part (9, 9', 9"), there is formed a circumferential ring rib (15) that is set back in the direction of the piston axis (6) relative to the radially outer edge of the centre part (9, 9', 9") and that forms the radially outer limit of a combustion bowl (16),
    - whereby the ring element (3, 3', 3") has a ring part (5) on its radially outer surface, and
    - whereby the ring element (3, 3', 3") is soldered to the piston base body (2, 2', 2") by an upper solder connection (23, 32) of length b and arranged on the radially inner side of a piston head (4) formed at least partially from the ring element (3, 3', 3"), and by a lower solder connection (24, 24', 33) of length c and arranged radially outwardly on the upper side of the centre part (9, 9', 9"),
    characterized in that, the ring element (3, 3', 3") has, on the one hand, a circumferential, upper, thinned wall region (49) in the region of the piston head (4) radially outward of the upper solder connection (23, 32) and, on the other hand, a circumferential, lower, thinned wall region (50, 50') between the ring part (5) and the lower solder connection (24, 24', 33),
    whereby the thickness (a) of the upper thinned wall region (49) has a lower value than the length (b) of the upper solder connection (23, 32) and whereby the thickness (d) of the lower thinned wall region (50, 50') has a lower value than the length (c) of the lower solder connection (24, 24', 33).
  2. Piston (1, 1', 1") according to claim 1, characterized in that the ratio of the length b of the upper solder connection (23, 32) and the thickness a of the upper, thinned wall region (49) is greater than 1 and less than 3, so that 1 < b/a < 3.
  3. Piston (1, 1', 1") according to claim 1 or 2, characterized in that the ratio of the length c of the lower solder connection (24, 24', 33) and the thickness d of the lower, thinned wall region (50, 50') is greater than 1 and less than 3, so that 1 < c/d < 3.
  4. Piston (1, 1") according to one of the preceding claims, characterized in that the ring element (3, 3') has roof region (25) that partially forms the piston head (4) whereby, in the side of the roof region (25) facing away from the piston head, there is formed an upwardly-directed, circumferential recess (26) that forms the upper, thinned wall region (49).
  5. Piston (1, 1") according to one of the preceding claims, characterized in that, between the lower solder connection (24, 24') and the ring part (5), in the radially inner side of the ring element (3, 3'), there is formed a radially-outward-directed, circumferential recess (27) that forms the lower thinned wall region (50).
  6. Piston (1') according to one of the claims 1 to 4, characterized in that, between the lower solder connection (33) and the ring part (5), in the radially inner side of the ring element (3"), there is formed a circumferential, radially-outward-directed recess (47) and, in the radially outer side of the ring element (3"), there is formed a circumferential, radially-inward-directed recess (48), and in that the two recesses (47, 48) lie opposite one another and form the lower thinned wall region (50').
  7. Piston (1") according to one of the preceding claims, characterized in that the lower solder connection (24') is formed from a conical, downward-tapering, lower end face (37) of the ring element (3') and from a similarly conical, downward-tapering surface (38) that limits the radially outer region of the centre part (9") from the piston head side.
EP08801217.4A 2007-09-15 2008-08-23 Two-piece piston for an internal combustion engine Active EP2188513B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007044106A DE102007044106A1 (en) 2007-09-15 2007-09-15 Two-piece piston for an internal combustion engine
PCT/DE2008/001394 WO2009033446A1 (en) 2007-09-15 2008-08-23 Two-piece piston for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2188513A1 EP2188513A1 (en) 2010-05-26
EP2188513B1 true EP2188513B1 (en) 2017-03-01

Family

ID=39967409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08801217.4A Active EP2188513B1 (en) 2007-09-15 2008-08-23 Two-piece piston for an internal combustion engine

Country Status (7)

Country Link
US (1) US8225765B2 (en)
EP (1) EP2188513B1 (en)
JP (1) JP5295245B2 (en)
KR (1) KR101484352B1 (en)
CN (1) CN101802381B (en)
DE (1) DE102007044106A1 (en)
WO (1) WO2009033446A1 (en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2229523A2 (en) * 2007-12-20 2010-09-22 MAHLE International GmbH Method for fixing an annular element on a 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
DE102008038325A1 (en) 2007-12-20 2009-06-25 Mahle International Gmbh Method for attaching a ring element on a piston for an internal combustion engine
DE102009032941A1 (en) 2009-07-14 2011-01-20 Mahle International Gmbh Multi-part piston for an internal combustion engine and method for its production
USD737861S1 (en) * 2009-10-30 2015-09-01 Caterpillar Inc. Engine piston
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
DE102010052578A1 (en) * 2010-11-25 2012-05-31 Daimler Ag Piston for an internal combustion engine
US9206764B2 (en) 2011-03-07 2015-12-08 Cummins Intellectual Property, Inc. Engine arrangement for enhanced cooling
US8973484B2 (en) 2011-07-01 2015-03-10 Mahle Industries Inc. Piston with cooling gallery
JP6324902B2 (en) * 2011-12-08 2018-05-16 フェデラル−モーグル・リミテッド・ライアビリティ・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｌｌｃ Integrated piston with improved combustion bowl edge region and method of manufacture
DE102012014193A1 (en) * 2012-07-18 2014-05-15 Mahle International Gmbh Piston for an internal combustion engine
DE102012014188A1 (en) * 2012-07-18 2014-01-23 Mahle International Gmbh Piston for an internal combustion engine
DE102012014200A1 (en) * 2012-07-18 2014-05-15 Mahle International Gmbh Piston for internal combustion engine, has cavity that is made of low melting metal or metal alloy and is provided adjacent to combustion bowl, for receiving coolant in circulating cooling passage of piston head
US20160061326A1 (en) * 2012-08-23 2016-03-03 Ks Kolbenschmidt Gmbh Joined connection on a two-piece steel piston and joining method
US20150226151A1 (en) * 2012-09-27 2015-08-13 Ks Kolenbenschmidt Gmbh Piston of two-piece construction for an internal combustion engine
KR101582950B1 (en) * 2015-04-30 2016-01-06 동양피스톤 주식회사 Piston for internal combustion engine and cooling channel core for manufacturing of the piston
WO2017085061A1 (en) * 2015-11-17 2017-05-26 Ks Kolbenschmidt Gmbh Piston for an internal combustion engine
KR101593543B1 (en) * 2016-01-04 2016-02-16 동양피스톤 주식회사 Piston for internal combustion engine
DE102017109471A1 (en) 2016-05-04 2017-11-09 Ks Kolbenschmidt Gmbh piston
RU195093U1 (en) * 2018-09-17 2020-01-15 Публичное акционерное общество "Автодизель" (Ярославский моторный завод) PISTON OF THE INTERNAL COMBUSTION ENGINE
US10926362B2 (en) * 2018-12-13 2021-02-23 Caterpillar Inc. Remanufactured engine piston and method
DE102019122878A1 (en) * 2019-08-27 2021-03-04 Man Energy Solutions Se Pistons and cylinders of an internal combustion engine and internal combustion engine
DE102021207405A1 (en) * 2021-07-13 2023-01-19 Federal-Mogul Nürnberg GmbH Steel pistons for an internal combustion engine

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244008A (en) * 1939-06-16 1941-06-03 Gen Motors Corp Piston construction
DE1245640B (en) * 1964-11-25 1967-07-27 Mahle Kg Pistons for internal combustion engines
FR2238372A5 (en) 1973-07-19 1975-02-14 Dampers
DE2730120A1 (en) * 1977-07-04 1979-01-25 Schmidt Gmbh Karl COOLED INTERNAL COMBUSTION PISTON
DE2832970A1 (en) * 1978-07-27 1980-02-07 Schmidt Gmbh Karl BUILT LIQUID-COOLED PISTON FOR INTERNAL COMBUSTION ENGINES
DE2919638A1 (en) * 1979-05-16 1980-11-20 Schmidt Gmbh Karl PISTON FOR INTERNAL COMBUSTION ENGINES
GB8413800D0 (en) * 1984-05-30 1984-07-04 Ae Plc Manufacture of pistons
US6279455B1 (en) 1998-10-06 2001-08-28 Caterpillar Inc. Method and apparatus for making a two piece unitary piston
DE19846152A1 (en) * 1998-10-07 2000-04-13 Mahle Gmbh Piston with piston base made of forged steel and a cooling channel
US6327962B1 (en) * 1999-08-16 2001-12-11 Caterpillar Inc. One piece piston with supporting piston skirt
US6286414B1 (en) * 1999-08-16 2001-09-11 Caterpillar Inc. Compact one piece cooled piston and method
DE10209331A1 (en) * 2002-03-02 2003-09-18 Ks Kolbenschmidt Gmbh Production of a piston comprises piston base with attached piston hubs, sliding a separate component forming piston shaft over the piston hubs and peripherally joining the separate component to an annular field
DE10244512A1 (en) * 2002-09-25 2004-04-15 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
DE10352244A1 (en) * 2003-11-08 2005-06-09 Mahle Gmbh Method for producing a piston for an internal combustion engine
WO2007093289A1 (en) * 2006-02-17 2007-08-23 Ks Kolbenschmidt Gmbh Multiple-part steel piston for an internal combustion engine having a cooling duct
US7533601B2 (en) * 2006-12-12 2009-05-19 Mahle Technology, Inc. Multi-part piston for a combustion engine
DE102008038325A1 (en) * 2007-12-20 2009-06-25 Mahle International Gmbh Method for attaching a ring element on a piston for an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US8225765B2 (en) 2012-07-24
KR20100069646A (en) 2010-06-24
DE102007044106A1 (en) 2009-03-19
CN101802381A (en) 2010-08-11
JP5295245B2 (en) 2013-09-18
KR101484352B1 (en) 2015-01-19
JP2010539369A (en) 2010-12-16
EP2188513A1 (en) 2010-05-26
WO2009033446A1 (en) 2009-03-19
CN101802381B (en) 2015-11-25
US20100307445A1 (en) 2010-12-09

Similar Documents

Publication Publication Date Title
EP2188513B1 (en) Two-piece piston for an internal combustion engine
DE112006001508B4 (en) Method for producing a fuel injection valve and fuel injection valve
EP1483493B1 (en) Multi-part, cooled piston for an internal combustion engine
DE4433762C2 (en) Ball joint
EP1984613B1 (en) Multiple-part steel piston for an internal combustion engine having a cooling duct
EP2681437B1 (en) Piston for an internal combustion engine, and method for the production thereof
DE112006001316B4 (en) WELDING OF PRESS-MATCHED FUEL INJECTION VALVE COMPONENTS
DE4134529C2 (en) Method for producing a piston head with a cooling chamber and piston head produced according to this method
WO2014012532A1 (en) Piston for an internal combustion engine
EP1636475B1 (en) Piston for an internal combustion engine
EP1636474B1 (en) Method for producing a one-piece piston for an internal combustion engine
DE10209168B4 (en) Steel piston with cooling channel
DE10354085B4 (en) lightweight valve
DE19712922A1 (en) Fuel injector
DE4445251A1 (en) Fastener for axially insertable inner and outer part, e.g. for joint of car track rod etc.
WO2016173900A1 (en) Disk filter and a method for producing same
WO2008089803A1 (en) Method for producing a piston for an internal combustion engine comprising a cooling duct, realized by joining the upper part of the piston and the lower part of the piston by means of a forged-upset connection
EP3421770B1 (en) Method for producing a piston for a combustion engine from a piston upper part and a piston lower part
DE102021203241A1 (en) Piston for an internal combustion engine and method of manufacturing the piston
WO2005049979A1 (en) Lightweight valve
DE19933891A1 (en) Blind rivet
EP3225827A1 (en) Gas valve for feeding a gaseous fuel into the intake pipe of a combustion engine
DE10230745B4 (en) Method for producing a piston with a short compression height
EP0954696B1 (en) Fuel injection valve and method for the production of a valve needle for a fuel injection valve
EP3850249B1 (en) Piston ring and piston with internal groove sealing

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

17P Request for examination filed

Effective date: 20100325

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MESSMER, DIETER

Inventor name: ESTRUM, TIMO

Inventor name: KORTAS, JOCHEN

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20151118

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20161129

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 871672

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170315

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502008015080

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170301

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

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

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170601

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170602

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

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170601

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

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

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

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

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

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

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170701

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170703

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502008015080

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

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

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

26N No opposition filed

Effective date: 20171204

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

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20170823

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

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180430

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170831

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

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170823

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

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170823

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170823

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

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170831

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170831

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

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 871672

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170823

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

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170823

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

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20080823

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

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170301

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

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170301

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

Ref country code: DE

Payment date: 20230821

Year of fee payment: 16