EP1561023B1 - Multi-part cooled piston for an internal combustion engine and method for producing the same - Google Patents

Multi-part cooled piston for an internal combustion engine and method for producing the same Download PDF

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Publication number
EP1561023B1
EP1561023B1 EP03769203A EP03769203A EP1561023B1 EP 1561023 B1 EP1561023 B1 EP 1561023B1 EP 03769203 A EP03769203 A EP 03769203A EP 03769203 A EP03769203 A EP 03769203A EP 1561023 B1 EP1561023 B1 EP 1561023B1
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EP
European Patent Office
Prior art keywords
piston
cooling channel
supporting ribs
rib
steel
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.)
Expired - Lifetime
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EP03769203A
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German (de)
French (fr)
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EP1561023A1 (en
Inventor
Gerhard Berr
Henk Ranvenshorst
Armin Ihle
Magnus Horn
Lars Lundin
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Mahle GmbH
Hirschvogel Umformtechnik GmbH
Volvo Powertrain AB
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Mahle GmbH
Hirschvogel Umformtechnik GmbH
Volvo Powertrain AB
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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 
    • F02F3/0015—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 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • 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

Definitions

  • the invention relates to a multi-piece cooled piston for an internal combustion engine with a steel forged piston upper part comprising a combustion bowl and a ring wall with ring portion, and a piston lower part having a piston skirt, hubs for receiving the piston connecting the piston rod with the piston and the piston shaft connected hub supports, and a method for producing such a piston.
  • a multi-part cooled piston for an internal combustion engine is from the JP 61175255 A known.
  • This piston shows, at the level of the ring portion of the piston, a number of ribs between which a heat-insulating plate for minimizing heat transfer from the combustion bowl to the ring section is arranged.
  • the invention is therefore based on the object to provide a piston concept for a multi-part cooled piston, with which a cost-effective production is ensured and can be counteracted with the effect of a piston deformation due to the effect of high gas pressures and temperatures.
  • a method for producing a multi-part cooled piston in which by forging a blank, the piston upper part is provided with support ribs in the cooling channel, which form radial sections of a circumferential annular rib radially to the piston longitudinal axis.
  • the piston upper part further comprises a combustion bowl and a ring wall with a ring portion. Subsequently, the thus forged blank is pre-machined by machining the connecting surface for joining.
  • hub support and piston skirt forged piston bottom is provided with an annular circumferential, connecting the hub supports support rib and is also pre-machined after joining for joining.
  • the subsequent joining or joining of the annular rib of the upper piston part with the support rib of the piston lower part takes place by means of a welding or soldering process.
  • the thus-joined piston blank is finished to a piston usable in an engine.
  • the support ribs can be manufactured or arranged distributed radially symmetrically and / or asymmetrically, for example by a larger number in the pressure counter-pressure direction of the piston, over the circumference of the cooling duct.
  • the cooling channel can be formed closer to the piston crown or combustion bowl and nevertheless has excellent dimensional stability.
  • the arrangement of the support ribs a kind of chamber formation in the cooling channel, d. H. Generation of shaker chambers, whereby an extension of the residence time of the cooling oil and thus improved heat dissipation of the piston areas to be cooled is achieved.
  • the inventive solution piston upper parts made of heat-resistant steel and piston bottoms, consisting of forged AFP steel, particularly easy and inexpensive to manufacture and connectable.
  • the multi-part cooled piston 20 consists of a forged piston upper part 1 with a combustion bowl 3, ring wall 4 with ring portion 11 and a cooling channel 7 and a piston lower part 2, the piston shaft 9 and hub supports 6, as from Fig. 5 can be seen.
  • support ribs 8 are provided, which are arranged in the region towards the piston head and extending in the direction of the cooling channel 7 in.
  • the height h of the support ribs 8 amounts to a maximum of half the total height H of the cooling channel 7, so that an unhindered cooling oil circuit is ensured.
  • FIGS. 3 and 4 show the support ribs 8 go radially to the piston longitudinal axis K in sections of an annular rib 5, which forms the annular rib 5 in their entirety.
  • the support ribs 8 are, as in Fig. 4 represented, radially symmetrically with an angle ⁇ , relative to the piston main axes K H , arranged distributed by 45 degrees of angle over the circumference of the cooling channel 7.
  • the distribution of the support ribs 8 may be designed such that in pressure-back pressure direction of the piston D and GD, a larger number of support ribs 8 is arranged, as transverse to it, ie, a single-ended circumferential distribution in the cooling channel 7, takes place.
  • annular circumferential support rib 10 is formed, as seen from Fig. 3 can be seen, which corresponds in their geometric dimensions with the annular rib 5.
  • the upper piston part 1 and lower piston part 2 is connected to each other via the support and annular ribs 10 and 5 by means of a welding or soldering process.
  • the upper piston part 1 is advantageously formed of an oxidation-resistant and / or heat-resistant material and the lower piston part 2 of a precipitation-hardening ferritic-pearlitic steel or tempered steel.
  • the method of manufacturing the piston top and piston bottoms 1 and 2 usually begins with the upsetting of a steel bar section, a so-called billet, followed by forming, the pre-engraving, to make the individual elements the respective piston part, such as cooling channel 7, the support ribs 8, combustion bowl 3 etc. or hub support 6 etc., a finished engraving in which material overhangs are removed, a subsequent burring, a subsequent heat treatment for stress relief in the material, a cleaning of the forged piston parts For example, sandblasting and the subsequent processing of the joining surfaces by machining.
  • the piston upper part 1 and piston lower part 2 thus produced is non-releasably connected by means of a welding or soldering process via the joining surfaces of the ring and support ribs 5 and 10, wherein subsequently a finishing of the piston 20 to a piston which can be used in a motor is carried out by means of machining.

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

Abstract

The invention relates to a multi-part cooled piston (20) for an internal combustion engine, said piston comprising a steel piston upper part (1) provided with a combustion cavity (3) and an annular wall (4) having an annular part (11), in addition to a piston lower part (2) comprising a piston shaft (9), hubs (12) for receiving the piston pin connecting the piston (20) to the connecting rod, and hub supports (6) connected to the piston shaft (9). The invention also relates to a method for producing one such piston (20). The aim of the invention is to produce one such piston with good dimensional stability in a cost-effective manner. To this end, a cooling channel (7) formed inside the piston upper part (1) comprises wrought supporting ribs (8) in the region thereof extending towards the combustion cavity (3), said supporting ribs respectively forming sections of a surrounding annular rib (5) comprising a contact area, radially in relation to the longitudinal axis (K) of the piston; the lower part (2) of the piston comprises a surrounding carrier rib (10) which is connected to the hub supports (6) and has a contact surface; and the piston upper part (1) and the piston lower part (2) are interconnected in a fixed manner by means of the contact surfaces of the annular rib and the carrier rib (5, 10).

Description

Die Erfindung betrifft einen mehrteiligen gekühlten Kolben für einen Verbrennungsmotor mit einem aus Stahl geschmiedeten Kolbenoberteil, das eine Verbrennungsmulde und eine Ringwand mit Ringpartie umfasst, und einem Kolbenunterteil, das einen Kolbenschaft, Naben zur Aufnahme des den Kolben mit dem Pleuel verbindenden Kolbenbolzen sowie mit den Kolbenschaft verbundene Nabenabstützungen umfasst, sowie einem Verfahren zur Herstellung eines derartigen Kolbens.The invention relates to a multi-piece cooled piston for an internal combustion engine with a steel forged piston upper part comprising a combustion bowl and a ring wall with ring portion, and a piston lower part having a piston skirt, hubs for receiving the piston connecting the piston rod with the piston and the piston shaft connected hub supports, and a method for producing such a piston.

Ein mehrteilig gekühlter Kolben für einen Verbrennungsmotor ist aus der JP 61175255 A bekannt. Dieser Kolben zeigt in Höhe der Ringpartie des Kolbens eine Anzahl von Rippen, zwischen denen eine wärmedämmende Platte zur Minimierung des Wärmetransports von der Brennraummulde zur Ringpartie angeordnet ist.A multi-part cooled piston for an internal combustion engine is from the JP 61175255 A known. This piston shows, at the level of the ring portion of the piston, a number of ribs between which a heat-insulating plate for minimizing heat transfer from the combustion bowl to the ring section is arranged.

Aus der WO 00/77379 A1 ist ein weiterer Kolben für einen Verbrennungsmotor bekannt, der zur Verbesserung der Wärmeabfuhr im Kühlkanal ein Wandteil mit mehreren radial angeordneten aus dünnem Blech bestehende Querwände aufweist.From the WO 00/77379 A1 Another piston for an internal combustion engine is known, which has a wall portion with a plurality of radially arranged thin sheet metal transverse walls to improve the heat dissipation in the cooling channel.

Ein zweiteiligen Kolben wird such in der US 626472B1 gezeigt.A two-piece piston will search in the US 626472B1 shown.

Diese vorgenannten Konstruktionen sind nicht geeignet, den Kolben hinsichtlich seiner Stabilität für hohe Zünddrücke und Temperaturen, wie sie bei modernen Dieselmotoren auftreten, zu verbessern.These aforementioned constructions are not suitable for improving the piston in terms of its stability for high ignition pressures and temperatures, such as occur in modern diesel engines.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Kolbenkonzept für einen mehrteiligen gekühlten Kolben anzugeben, mit dem eine kostengünstige Herstellung gewährleistet ist und mit dem wirksam einer Kolbendeformation infolge Einwirkung hoher Gasdrücke und Temperaturen entgegengewirkt werden kann.The invention is therefore based on the object to provide a piston concept for a multi-part cooled piston, with which a cost-effective production is ensured and can be counteracted with the effect of a piston deformation due to the effect of high gas pressures and temperatures.

Die Lösung der Aufgabe ist in den unabhängigen Ansprüchen angegeben.The solution of the problem is given in the independent claims.

Erfindungsgemäß ist ein Verfahren zur Herstellung eines mehrteiligen gekühlten Kolbens angegeben, bei dem durch Schmieden eines Rohlings das Kolbenoberteil mit Stützrippen im Kühlkanal versehen wird, die radial zur Kolbenlängsachse hin jeweils Abschnitte einer umlaufenden Ringrippe bilden. Das Kolbenoberteil umfasst des Weiteren eine Verbrennungsmulde und eine Ringwand mit Ringpartie. Anschließend wird der derart geschmiedete Rohling durch Bearbeitung der Verbindungsfläche zum Fügen vorbearbeitet.According to the invention, a method for producing a multi-part cooled piston is specified, in which by forging a blank, the piston upper part is provided with support ribs in the cooling channel, which form radial sections of a circumferential annular rib radially to the piston longitudinal axis. The piston upper part further comprises a combustion bowl and a ring wall with a ring portion. Subsequently, the thus forged blank is pre-machined by machining the connecting surface for joining.

Ein mit Naben, Nabenabstützung und Kolbenschaft umfassendes geschmiedetes Kolbenunterteil ist mit einer ringförmig umlaufenden, die Nabenabstützungen verbindenden Tragrippe versehen und wird nach dem Schmieden ebenfalls zum Fügen vorbearbeitet. Das nachfolgende Fügen bzw. Verbinden der Ringrippe des Kolbenoberteils mit der Tragrippe des Kolbenunterteils erfolgt mittels eines Schweiß- oder Lötverfahrens. Anschließend wird der so gefügte Kolbenrohling zu einem in einem Motor verwendbaren Kolben endbearbeitet.Forged with a hub, hub support and piston skirt forged piston bottom is provided with an annular circumferential, connecting the hub supports support rib and is also pre-machined after joining for joining. The subsequent joining or joining of the annular rib of the upper piston part with the support rib of the piston lower part takes place by means of a welding or soldering process. Subsequently, the thus-joined piston blank is finished to a piston usable in an engine.

Vorteilhaft können die Stützrippen radial symmetrisch und/oder unsymmetrisch, beispielsweise durch eine größere Anzahl in Druck-Gegendruckrichtung des Kolbens, über den Umfang des Kühlkanals verteilt hergestellt bzw. angeordnet sein. Bei einem derart hergestellten Kolben kann der Kühlkanal näher in Richtung Kolbenboden bzw. Verbrennungsmulde ausgeformt werden und weist trotzdem eine ausgezeichnete Formstabilität auf. Außerdem erfolgt durch die Anordnung der Stützrippen eine Art Kammerbildung im Kühlkanal, d. h. Erzeugung von Shaker-Räumen, wodurch eine Verlängerung der Verweildauer des Kühlöls und damit verbesserte Wärmeableitung der zu kühlenden Kolbenbereiche erreicht wird.Advantageously, the support ribs can be manufactured or arranged distributed radially symmetrically and / or asymmetrically, for example by a larger number in the pressure counter-pressure direction of the piston, over the circumference of the cooling duct. In the case of a piston produced in this way, the cooling channel can be formed closer to the piston crown or combustion bowl and nevertheless has excellent dimensional stability. In addition, the arrangement of the support ribs a kind of chamber formation in the cooling channel, d. H. Generation of shaker chambers, whereby an extension of the residence time of the cooling oil and thus improved heat dissipation of the piston areas to be cooled is achieved.

Durch die erfindungsgemäße Lösung sind Kolbenoberteile aus warmfestem Stahl und Kolbenunterteile, bestehend aus geschmiedetem AFP-Stahl, besonders einfach und kostengünstig herstell- und verbindbar.The inventive solution piston upper parts made of heat-resistant steel and piston bottoms, consisting of forged AFP steel, particularly easy and inexpensive to manufacture and connectable.

Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.Advantageous developments are the subject of the dependent claims.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels näher erläutert. Es zeigt:

Fig. 1
einen erfindungsgemäßen Kolben im Querschnitt, geschnitten in Bolzenrich- tung;
Fig. 2
einen erfindungsgemäßen Kolben in Unteransicht, geschnitten entlang der Linie I-I aus Fig. 1;
Fig. 3
einen erfindungsgemäßen Kolben im Querschnitt, geschnitten quer zur Kol- benbolzenrichtung;
Fig. 4
einen erfindungsgemäßen Kolben, geschnitten entlang der Linie II-II aus Fig.3;
Fig. 5
einen erfindungsgemäßen Kolben in perspektivischer Ansicht.
The invention will be explained in more detail below with reference to an embodiment. It shows:
Fig. 1
a piston according to the invention in cross section, cut in the direction of the bolt;
Fig. 2
a piston according to the invention in a bottom view, taken along the line II Fig. 1 ;
Fig. 3
a piston according to the invention in cross section, cut transversely to the Kolbbolzenrichtung;
Fig. 4
a piston according to the invention, cut along the line II-II Figure 3 ;
Fig. 5
a piston according to the invention in a perspective view.

Der erfindungsgemäße mehrteilig gekühlte Kolben 20 besteht aus einem geschmiedeten Kolbenoberteil 1 mit einer Verbrennungsmulde 3, Ringwand 4 mit Ringpartie 11 und einem Kühlkanal 7 sowie aus einem Kolbenunterteil 2, das einen Kolbenschaft 9 sowie Nabenabstützungen 6, wie aus Fig. 5 ersichtlich, umfasst. Im Kühlkanal 7 sind Stützrippen 8 vorgesehen, die im Bereich zum Kolbenboden hin angeordnet sind und sich in Richtung des Kühlkanals 7 hinein erstrecken. Die Höhe h der Stützrippen 8 beträgt dabei maximal die Hälfte der Gesamthöhe H des Kühlkanals 7, sodass ein ungehinderter Kühlölkreislauf gewährleistet bleibt. Durch diese Konstruktion werden Shaker-Räume für das Kühlöl geschaffen, welche die Kühlwirkung erhöhen.The multi-part cooled piston 20 according to the invention consists of a forged piston upper part 1 with a combustion bowl 3, ring wall 4 with ring portion 11 and a cooling channel 7 and a piston lower part 2, the piston shaft 9 and hub supports 6, as from Fig. 5 can be seen. In the cooling channel 7 support ribs 8 are provided, which are arranged in the region towards the piston head and extending in the direction of the cooling channel 7 in. The height h of the support ribs 8 amounts to a maximum of half the total height H of the cooling channel 7, so that an unhindered cooling oil circuit is ensured. By this construction, shaker spaces are created for the cooling oil, which increase the cooling effect.

Wie die Figuren 3 und 4 zeigen, gehen die Stützrippen 8 radial zur Kolbenlängsachse K in Abschnitte einer Ringrippe 5 über, die in ihrer Gesamtheit die Ringrippe 5 bildet. Die Stützrippen 8 sind, wie in Fig. 4 dargestellt, radial symmetrisch mit einem Winkel β, bezogen auf die Kolbenhauptachsen KH, von 45 Winkelgrad über den Umfang des Kühlkanals 7 verteilt angeordnet. In einem weiteren Ausführungsbeispiel (nicht dargestellt) kann die Verteilung der Stützrippen 8 derart gestaltet sein, dass in Druck-Gegendruckrichtung des Kolbens D bzw. GD eine größere Anzahl von Stützrippen 8 angeordnet ist, als quer dazu, d. h., eine unsymmetrische umfangsseitige Verteilung im Kühlkanal 7, erfolgt. So kann die Verteilung der Stützrippen 8 im Kühlkanal 7, wenn dieser nach den durch die Kolbenhauptachsen KH gebildeten Quadranten I - IV charakterisiert wird (Fig.4), derart sein, dass innerhalb eines Quadranten eine symmetrische oder unsymmetrische Verteilung vorgesehen ist, die sich in den gegenüberliegenden Quadranten, also I. und III. oder II. und IV., wiederfindet, um den entsprechenden Temperatur- und Spannungsanforderungen im Kolben 20 im Lastfall gerecht zu werden.As the FIGS. 3 and 4 show the support ribs 8 go radially to the piston longitudinal axis K in sections of an annular rib 5, which forms the annular rib 5 in their entirety. The support ribs 8 are, as in Fig. 4 represented, radially symmetrically with an angle β, relative to the piston main axes K H , arranged distributed by 45 degrees of angle over the circumference of the cooling channel 7. In a further embodiment (not shown), the distribution of the support ribs 8 may be designed such that in pressure-back pressure direction of the piston D and GD, a larger number of support ribs 8 is arranged, as transverse to it, ie, a single-ended circumferential distribution in the cooling channel 7, takes place. Thus, the distribution of the support ribs 8 in the cooling channel 7, if this is characterized according to the quadrants I-IV formed by the main piston axes K H ( Figure 4 ), be such that within a quadrant, a symmetrical or asymmetrical distribution is provided, which in the opposite quadrant, ie I. and III. or II. and IV., finds to meet the corresponding temperature and voltage requirements in the piston 20 in the load case.

Aus den Nabenabstützungen 6 heraus ist eine ringförmig umlaufende Tragrippe 10 ausgebildet, wie aus Fig. 3 ersichtlich, die in ihren geometrischen Abmessungen mit der Ringrippe 5 korrespondiert. Das Kolbenoberteil 1 und Kolbenunterteil 2 ist über die Trag- und Ringrippe 10 und 5 mittels eines Schweiß- oder Lötverfahrens unlösbar miteinander verbunden. Das Kolbenoberteil 1 ist vorteilhaft aus einem oxidationsbeständigen und/oder warmfesten Werkstoff und das Kolbenunterteil 2 aus einem ausscheidungs-härtenden ferritisch-perlitischen Stahl oder Vergütungsstahl gebildet.From the hub supports 6 out an annular circumferential support rib 10 is formed, as seen from Fig. 3 can be seen, which corresponds in their geometric dimensions with the annular rib 5. The upper piston part 1 and lower piston part 2 is connected to each other via the support and annular ribs 10 and 5 by means of a welding or soldering process. The upper piston part 1 is advantageously formed of an oxidation-resistant and / or heat-resistant material and the lower piston part 2 of a precipitation-hardening ferritic-pearlitic steel or tempered steel.

Verfahrenstechnisch ist die Herstellung des Kolbens gekennzeichnet durch die Schritte

  • Schmieden eines Rohlings zur Herstellung eines Kolbenoberteils 1 mit Stützrippen 8 im Kühlkanal 7, die radial zur Kolbenlängsachse K hin jeweils Abschnitte einer umlaufenden Ringrippe 5 bilden;
  • Bearbeiten der Fügfläche der Ringrippe 5 durch spanabhebende Bearbeitung;
  • Schmieden eines Rohlings zur Herstellung des Kolbenunterteils 2 mit einer ringförmig umlaufenden, mit den Nabenabstützungen 6 verbundenen Fügfläche der Tragrippe 10;
  • Bearbeiten der Fügfläche der Tragrippe 10 durch spanabhebende Bearbeitung;
  • Fügen der Ringrippe 5 des Kolbenoberteils 1 mit der Tragrippe 10 des Kolbenunterteils 2;
  • Endbearbeitung des gefügten Kolbens 20.
Technically, the production of the piston is characterized by the steps
  • Forging a blank for producing a piston upper part 1 with support ribs 8 in the cooling channel 7, which form radially to the piston longitudinal axis K each sections of a circumferential annular rib 5;
  • Processing of the joining surface of the annular rib 5 by machining;
  • Forging a blank for the production of the piston lower part 2 with an annular circumferential, connected to the hub supports 6 joining surface of the support rib 10;
  • Processing of the joining surface of the support rib 10 by machining;
  • Joining the annular rib 5 of the upper piston part 1 with the support rib 10 of the piston lower part 2;
  • Finishing the joined piston 20.

Einem auf dem Fachgebiet tätigen Fachmann ist klar, dass das Verfahren zur Herstellung der Kolbenober- und Kolbenunterteile 1 und 2 üblicherweise beginnt mit der Stauchung eines Stahl-Stangenabschnittes, eines sogenannten Knüppels, einer anschließenden Umformung, der Vorgravur, zur Herstellung der einzelnen Elemente des jeweiligen Kolbenteils, wie Kühlkanal 7, der Stützrippen 8, Verbrennungsmulde 3 usw. bzw. Nabenabstützung 6 usw., einer Fertiggravur, bei dem Materialüberhänge entfernt werden, einem anschließenden Abgraten, einer folgenden Wärmebehandlung zum Spannungsabbau im Material, einer Reinigung der geschmiedeten Kolbenteile durch beispielsweise Sandstrahlen und der anschließenden Bearbeitung der Fügflächen durch spanabhebende Bearbeitung.It will be apparent to one skilled in the art that the method of manufacturing the piston top and piston bottoms 1 and 2 usually begins with the upsetting of a steel bar section, a so-called billet, followed by forming, the pre-engraving, to make the individual elements the respective piston part, such as cooling channel 7, the support ribs 8, combustion bowl 3 etc. or hub support 6 etc., a finished engraving in which material overhangs are removed, a subsequent burring, a subsequent heat treatment for stress relief in the material, a cleaning of the forged piston parts For example, sandblasting and the subsequent processing of the joining surfaces by machining.

Das derart hergestellte Kolbenoberteil 1 und Kolbenunterteil 2 wird mittels eines Schweiß- oder Lötverfahrens über die Fügflächen der Ring- und Tragrippe 5 und 10 unlösbar verbunden, wobei nachfolgend eine Endbearbeitung des Kolbens 20 zu einem im einem Motor einsetzbaren Kolben mittels spanabhebender Bearbeitung durchgeführt wird.The piston upper part 1 and piston lower part 2 thus produced is non-releasably connected by means of a welding or soldering process via the joining surfaces of the ring and support ribs 5 and 10, wherein subsequently a finishing of the piston 20 to a piston which can be used in a motor is carried out by means of machining.

Bezugszeichenreference numeral

Mehrteilig gekühlter KolbenMulti-piece cooled piston
2020
KolbenoberteilPiston crown
11
KolbenunterteilPiston part
22
Verbrennungsmuldecombustion bowl
33
Ringwandring wall
44
Ringrippeannular rib
55
Nabenabstützungboss support
66
Kühlkanalcooling channel
77
Stützrippesupporting rib
88th
Kolbenschaftpiston shaft
99
Tragrippesupporting rib
1010
Ringpartiering belt
1111
Nabenhub
1212
Kolbenlängsachsepiston longitudinal axis
KK
KolbenhauptachsenPiston main axes
KH K H
KühlkanalhöheCooling duct height
HH
Höhe der StützrippenHeight of support ribs
hH
Druck-Gegendruckrichtung des KolbensPressure counterpressure direction of the piston
D, GDD, GD

Claims (5)

  1. Procedure for the production of a multipart, cooled piston (20) for a combustion engine with a piston upper part (1) of steel comprising a combustion cavity (3) and a ring wall (4) having an annular part (11), and a piston lower part (2) comprising a piston skirt (9), hubs (12) for receiving the piston pin connecting the piston to the connecting rod, and hub supports (6) connected to the piston skirt, whereby the piston upper part (1) exhibits in the cooling channel (7) supporting ribs (8), which radially to the piston axis (K) each form sections of an all-round ring rib (5) and form a contact surface, in order to connect it in a fixed manner with a circular surrounding carrier rib (10) of the piston lower part (2) which is connected to the hub supports,
    characterised in that
    the production of the piston upper part, with the cooling channel (7) fitted with supporting ribs (8), is carried out via forging from a blank, whereby after the forging the supporting ribs exhibit a height (h) that amounts to a maximum of half of the total height (H) of the cooling channel.
  2. Procedure according to Claim 1, characterised in that the supporting ribs (8) are radially distributed symmetrically and/or asymmetrically over the circumference of the cooling channel (7).
  3. Multipart, cooled piston (20) for a combustion engine with a piston upper part (1) made of steel, comprising a combustion cavity (3) and a ring wall (4) having an annular part (11), and a piston lower part (2) comprising a piston skirt (9), hubs (12) for receiving the piston pin connecting the piston to the connecting rod, and hub supports (6) connected to the piston skirt, whereby the piston upper part (1) exhibits in the cooling channel (7) supporting ribs (8), which radially to the piston axis (K) each form sections of an all-round ring rib (5) and form a contact surface, with which it is connected in a fixed manner with a circular surrounding carrier rib (10) of the piston lower part (2),
    characterised in that
    the supporting ribs (8) exhibit a height (h) that amounts to a maximum of half of the total height (H) of the cooling channel (7).
  4. Piston according to Claim 3, characterised in that the supporting ribs (8) are radially distributed symmetrically and/or asymmetrically over the circumference of the cooling channel (7).
  5. Piston according to Claim 4, characterised in that the piston upper part (1) is made of an oxidation-resistant and/or heat-resistant material, and the piston lower part (2) is made of precipitation-hardening ferritic-pearlitic steel or heat-treatable steel.
EP03769203A 2002-09-25 2003-09-19 Multi-part cooled piston for an internal combustion engine and method for producing the same Expired - Lifetime EP1561023B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10244513 2002-09-25
DE10244513A DE10244513A1 (en) 2002-09-25 2002-09-25 Multi-part cooled piston for an internal combustion engine and method for its production
PCT/DE2003/003117 WO2004029441A1 (en) 2002-09-25 2003-09-19 Multi-part cooled piston for an internal combustion engine and method for producing the same

Publications (2)

Publication Number Publication Date
EP1561023A1 EP1561023A1 (en) 2005-08-10
EP1561023B1 true EP1561023B1 (en) 2011-05-25

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ID=30775598

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Application Number Title Priority Date Filing Date
EP03769203A Expired - Lifetime EP1561023B1 (en) 2002-09-25 2003-09-19 Multi-part cooled piston for an internal combustion engine and method for producing the same

Country Status (9)

Country Link
US (1) US6691666B1 (en)
EP (1) EP1561023B1 (en)
JP (1) JP4411212B2 (en)
KR (1) KR20050065560A (en)
CN (1) CN100347432C (en)
AU (1) AU2003277806A1 (en)
DE (2) DE10244513A1 (en)
HK (1) HK1078918A1 (en)
WO (1) WO2004029441A1 (en)

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Also Published As

Publication number Publication date
CN100347432C (en) 2007-11-07
WO2004029441A1 (en) 2004-04-08
DE10393902D2 (en) 2005-09-01
US6691666B1 (en) 2004-02-17
HK1078918A1 (en) 2006-03-24
JP4411212B2 (en) 2010-02-10
DE10244513A1 (en) 2004-04-08
CN1685140A (en) 2005-10-19
EP1561023A1 (en) 2005-08-10
AU2003277806A8 (en) 2004-04-19
KR20050065560A (en) 2005-06-29
JP2006500507A (en) 2006-01-05
AU2003277806A1 (en) 2004-04-19

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