EP2038078A1 - Cooling channel piston for an internal combustion engine and method for the production thereof - Google Patents

Cooling channel piston for an internal combustion engine and method for the production thereof

Info

Publication number
EP2038078A1
EP2038078A1 EP07726101A EP07726101A EP2038078A1 EP 2038078 A1 EP2038078 A1 EP 2038078A1 EP 07726101 A EP07726101 A EP 07726101A EP 07726101 A EP07726101 A EP 07726101A EP 2038078 A1 EP2038078 A1 EP 2038078A1
Authority
EP
European Patent Office
Prior art keywords
piston
cooling channel
wall
annular
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07726101A
Other languages
German (de)
French (fr)
Inventor
Reiner Feeser
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP2038078A1 publication Critical patent/EP2038078A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B21K1/185—Making machine elements pistons or plungers with cooling channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass 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 
    • F02F3/16—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • the invention relates to a method for producing a one-piece piston made of steel for an internal combustion engine.
  • the small compression height piston includes a cooling channel adjacent to a ring field.
  • a piston blank is produced by means of a forging or casting method, before a wall section of the cooling channel is formed to form a cooling channel.
  • EP 1 452 250 A2 relates to forging processes for producing a one-piece piston made of steel.
  • a circumferential, outwardly projecting collar is formed by this method in the region of a land land, which is assigned to a likewise circumferential recess.
  • the collar is formed by a bend to form a closed cooling channel.
  • a method for producing a forged head of a piston in which a method step includes forming or bending the ring portion in a final position.
  • This piston comprises a cooling channel arranged on the outside with a relatively small cross section, which ensures only locally and thus no sufficient large-scale cooling effect of the piston.
  • the present invention is based on the object, starting from the known prior art, to realize a heavy-duty weight and cost-optimized cooling channel piston, which includes an enlarged cooling channel.
  • the piston between a ring field and a combustion bowl a cooling channel, which is closed by forming or bending a piston crown region.
  • the arrangement of the cooling channel made by means of forging, machining, axially spaced from the ring field and the combustion bowl causes effective coolant loading associated with optimum cooling action of the piston areas of greatest thermal stress such as piston ring field, combustion bowl and at least one edge zone the firestop.
  • the cooling channel design according to the invention enables thin wall thicknesses which improve the heat transfer, as a result of which a piston with an optimum cooling effect can be represented.
  • the location and the design of the cooling channel according to the invention cause a desired reduced compression height, which simultaneously sets a desired reduced piston mass.
  • the invention includes in a shaft window region of the piston at least one recess and / or an opening in order to achieve a further reduction in the weight of the piston.
  • the lightweight piston blank made of steel is produced according to the invention in one operation by a forging process.
  • a forging process By subsequent forming or bending of a piston crown region of the cooling channel is closed, before a self-adjusting joint is sealed by means of a weld.
  • This requires neither core inserts, a friction welding process still inserting or attaching sheet metal parts.
  • the production according to the invention which can advantageously also be applied to a casting process, involves a large potential for savings due to the reduced processes.
  • the inventive concept simplifies or optimizes the production of one-piece steel pistons, which are preferably intended for high-speed, high-power diesel internal combustion engines, which reach a power level of> 80 KW / L, with ignition pressures of> 200 bar set.
  • a preferred embodiment of the piston according to the invention provides to extend an inner, the combustion chamber trough associated wall of the cooling channel.
  • the forming a ring portion, extended wall portion is assigned after forming or bending with a free end of a step of the outer wall of the piston.
  • the ring portion is positively supported on the outer wall.
  • the piston according to the invention includes an arrangement of recesses or openings, as a further measure for reducing the piston mass.
  • symmetrically circumferentially distributed holes are introduced into the shaft window area over which, without compromising the strength of the piston, an effective weight reduction can be achieved.
  • the cooling channel extending at least over a length of the annular field preferably forms a largely rectangular cross-sectional profile.
  • This design advantageously increases the flow volume and thus the coolant intake, whereby the cooling effect of the piston can be significantly increased.
  • the large-volume cooling channel reduces the weight of the piston.
  • this shape of the cooling channel increases one degree of freedom for placement from openings for entry and exit of the coolant in the cooling channel from the point of optimum application.
  • Another embodiment feature of the invention provides to design the walls of the cooling channel with almost the same wall thickness. Due to tuned, largely matching wall thicknesses of the cooling channel, a structurally stable, highest requirements can be achieved by maintaining the piston.
  • the design as well as the manufacturing method of the piston according to the invention allows a preferred small compression height, which directly affects the piston mass.
  • the compression height (S) of ⁇ 0.7 x piston diameter (D) can be realized with the piston according to the invention.
  • FIG. 1 shows a cooling channel piston according to the invention after forming a wall of the cooling channel
  • FIG. 2 shows an enlarged section of the piston according to FIG. 1,
  • FIG. 3 the cooling channel piston of FIG. 1 after completion.
  • FIG. 1 shows a one-piece, designed as a cooling channel piston piston 1 in perspective in conjunction with a partial section.
  • the piston 1 produced by means of a forging or casting process is shown as a piston blank, which forms a pre-formed or finished combustion bowl 3 centrally in a piston head 2.
  • At the piston head 2 is followed on an outer jacket of the piston 1 in a truncated 3 illustrated in Fig 3, to which a ring field 5 and a shaft 6 follows.
  • An integrated in the piston 1, circumferentially arranged cooling channel 7 is laterally from an inner, the combustion bowl 3 associated wall 8 and an outer, the ring field 5 associated wall 9 limited.
  • An integrally connected to the inner wall 8, bent by a deformation ring portion 10 closes the cooling channel 7, while forming a piston crown portion 11.
  • a free end of the ring portion 10 is supported to form a joint 12 at a stage 13 of the outer wall 9.
  • a seal of the joint 12 by means of a weld or brazing.
  • the shaft 6 of the piston 1 includes two diametrically opposed pin bosses 14, each including a hub bore 15. Offset to the pin bosses 14, symmetrically circumferentially distributed recesses 17 for weight saving are further introduced in a shaft window region 16 of the shaft 6.
  • FIG. 2 shows a section of the piston 1 as a piston blank on an enlarged scale.
  • the inner wall 8 of the cooling channel 7 is then extended by the annular portion 10, which is inflected or deformed in a subsequent process step until it rests against the step 13 of the wall 9.
  • the piston 1 as a finished part is shown in FIG.
  • This illustration shows further details of the piston 1, such as the designated for piston rings ring field 5, which adjoins the top land 4.
  • the cooling channel 7 has a longitudinal extent, which largely coincides with the length of the ring field 5 and includes at least one edge zone of the top land 4.
  • this illustration illustrates the design of the cooling channel 7, which is surrounded by walls 8, 9, 10 and 19 almost the same wall thickness and in this case has a largely rectangular cross-sectional profile, or by the geometric shape of the finished rotated trough 3, the piston head 11, of the ring field 5 and the inner mold 19 is formed by adherence uniformly thin walls.
  • the arrangement of the cooling channel 7 causes a desired reduced, a distance between a hub axle 18 and the piston head 2 defining compression height "S". LIST OF REFERENCE NUMBERS

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

Abstract

The invention relates to a method for producing a one-piece, lightweight piston (1) consisting of steel and having a small compression depth (S), said piston having at least one cavity (17) in a shaft aperture region (16). A piston blank is produced in a first step using a forging or casting method. To form a cooling channel (7) between an annular region (5) and a combustion chamber recess (3) an annular section (10) is formed in one piece onto the wall (8) of a cooling channel (7) in the vicinity of the piston base (11). The joint (12) produced between the annular section (10) and an outer wall (9) of the cooling channel (7) is sealed by welding.

Description

B E S C H R E I B U N G DESCRIPTION
KUHLKANALKOLBEN FÜR EINE BRΞNNKRAFTMASCHINE UND VERFAHREN ZU SEINER HERSTELLUNGCOOLING CHANNEL PISTON FOR A BROTHER AND A METHOD FOR THE PRODUCTION THEREOF
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines einteiligen Kolbens aus Stahl für eine Brennkraftmaschine. Der eine kleine Kompressionshöhe aufweisende Kolben schließt einen zu einem Ringfeld benachbarten Kühlkanal ein. In einem Verfahrensschritt wird mittels eines Schmiede- oder Gießverfahrens ein Kolbenrohling hergestellt, bevor zur Bildung eines Kühlkanals ein Wändungsabschnitt des Kühlkanals umgeformt wird.The invention relates to a method for producing a one-piece piston made of steel for an internal combustion engine. The small compression height piston includes a cooling channel adjacent to a ring field. In a method step, a piston blank is produced by means of a forging or casting method, before a wall section of the cooling channel is formed to form a cooling channel.
Die EP 1 452 250 A2 bezieht sich auf Schmiedeverfahren zur Herstellung eines einteiligen Kolbens aus Stahl. Zur Bildung eines Kühlkanals wird mit diesem Verfahren im Bereich eines Feuerstegs ein umlaufender, nach außen stehender Bund geformt, der einer ebenfalls umlaufenden Ausnehmung zugeordnet ist. In einem weiteren Arbeitsschritt wird zur Bildung eines geschlossenen Kühlkanals der Bund durch eine Einbiegung umgeformt.EP 1 452 250 A2 relates to forging processes for producing a one-piece piston made of steel. To form a cooling channel, a circumferential, outwardly projecting collar is formed by this method in the region of a land land, which is assigned to a likewise circumferential recess. In a further step, the collar is formed by a bend to form a closed cooling channel.
Aus der DE 37 13 191 C1 ist ein Verfahren zur Herstellung eines geschmiedeten Kopfes eines Kolbens bekannt, bei dem ein Verfahrensschritt das Umformen oder Umbiegen des Ringabschnitts in eine endgültige Lage einschließt. Dieser Kolben umfasst einen außenseitig angeordneten Kühlkanal mit einem relativ kleinen Querschnitt, der nur lokal und damit keine ausreichende großflächige Kühlwirkung des Kolbens sicherstellt.From DE 37 13 191 C1 a method for producing a forged head of a piston is known in which a method step includes forming or bending the ring portion in a final position. This piston comprises a cooling channel arranged on the outside with a relatively small cross section, which ensures only locally and thus no sufficient large-scale cooling effect of the piston.
Weiterhin sind Stahlkolben für Nutzfahrzeuge bekannt, bei denen der Kühlkanal mit einem Abdeckblech verschlossen wird. Diese Maßnahme ist nur bei offenen und gut zugänglichen Kühlkanälen möglich und erfordert zudem einen hohen Aufwand an mechanischer Zerspanarbeit. Weiterhin schränkt das Ausdrehen des Kühlkanals an dem fertigen Bauteil die konstruktiven Freiheiten ein. PKW-Stahlkolben werden versuchsweise mit einem verlorenen Kern, insbesondere einem Keramikkern gießtechnisch hergestellt. Dieses prozessbedingt aufwändige und kostenintensive Verfahren erfordert nachteilig komplexe Werkzeuge zur Herstellung der Rohlinge.Furthermore, steel pistons for commercial vehicles are known in which the cooling channel is closed by a cover plate. This measure is only possible with open and easily accessible cooling channels and also requires a high cost of mechanical machining. Furthermore, the turning of the cooling channel on the finished component limits the design freedom. Be car steel piston experimentally produced by casting with a lost core, in particular a ceramic core. This process-consuming and costly process disadvantageously requires complex tools for the production of blanks.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ausgehend von dem bekannten Stand der Technik, einen hochbelastbaren gewichts- und kostenoptimierten Kühlkanalkolben zu realisieren, der einen vergrößerten Kühlkanal einschließt.The present invention is based on the object, starting from the known prior art, to realize a heavy-duty weight and cost-optimized cooling channel piston, which includes an enlarged cooling channel.
Diese Aufgabe wird durch die Merkmale des unabhängigen Anspruchs 1 gelöst.This object is solved by the features of independent claim 1.
Erfindungsgemäß schließt der Kolben zwischen einem Ringfeld und einer Brennraummulde einen Kühlkanal ein, der durch Umformen oder Einbiegen eines Kolbenbodenbereichs geschlossen wird. Die Anordnung des mittels einer Einschmiedung, einer mechanischen Bearbeitung, hergestellten Kühlkanals, der axial zu dem Ringfeld und der Brennraummulde beabstandet ist, bewirkt eine wirksame Kühlmittelbeaufschlagung, verbunden mit einer optimalen Kühlwirkung der Kolbenbereiche größter thermischer Belastung wie Kolben-Ringfeld, Brennraummulde sowie zumindest einer Randzone des Feuerstegs. Zur Realisierung eines vorteilhaft vergrößerten Kühlkanalvolumens ermöglicht die erfindungsgemäße Kühlkanalgestaltung dünne, den Wärmeübergang verbessernde Wandstärken, wodurch ein Kolben mit einer optimalen Kühlwirkung darstellbar ist. Die Lage sowie die Gestaltung des erfindungsgemäßen Kühlkanals bewirken eine gewünschte verringerte Kompressionshöhe, wodurch sich gleichzeitig eine gewünschte reduzierte Kolbenmasse einstellt. Weiterhin schließt die Erfindung in einem Schaftfensterbereich des Kolbens zumindest eine Aussparung und/oder einen Durchbruch ein, um eine weitere Gewichtsreduzierung des Kolbens zu erreichen.According to the invention, the piston between a ring field and a combustion bowl a cooling channel, which is closed by forming or bending a piston crown region. The arrangement of the cooling channel made by means of forging, machining, axially spaced from the ring field and the combustion bowl causes effective coolant loading associated with optimum cooling action of the piston areas of greatest thermal stress such as piston ring field, combustion bowl and at least one edge zone the firestop. In order to realize an advantageously enlarged cooling channel volume, the cooling channel design according to the invention enables thin wall thicknesses which improve the heat transfer, as a result of which a piston with an optimum cooling effect can be represented. The location and the design of the cooling channel according to the invention cause a desired reduced compression height, which simultaneously sets a desired reduced piston mass. Furthermore, the invention includes in a shaft window region of the piston at least one recess and / or an opening in order to achieve a further reduction in the weight of the piston.
Der leichtgewichtige Kolbenrohling aus Stahl wird gemäß der Erfindung in einem Arbeitsgang durch ein Schmiedeverfahren hergestellt. Durch ein anschließendes Umformen oder Einbiegen eines Kolbenbodenbereichs wird der Kühlkanal geschlossen, bevor eine sich einstellende Fuge mittels einer Schweißnaht abgedichtet wird. Dazu bedarf es weder Kerneinlagen, eines Reibschweißverfahrens noch des Einlegens oder Anbringens von Blechteilen. Die erfindungsgemäße Herstellung, die vorteilhaft auch auf ein Gießverfahren übertragbar ist, beinhaltet aufgrund der reduzierten Prozesse ein großes Einsparpotential. Das erfindungsgemäße Konzept vereinfacht bzw. optimiert die Herstellung von einteiligen Stahlkolben, die bevorzugt für schnellaufende, hochbelastbare Dieselbrennkraftmaschinen bestimmt sind, die ein Leistungsniveau von > 80 KW / L erreichen, wobei sich Zünddrücke von > 200 bar einstellen.The lightweight piston blank made of steel is produced according to the invention in one operation by a forging process. By subsequent forming or bending of a piston crown region of the cooling channel is closed, before a self-adjusting joint is sealed by means of a weld. This requires neither core inserts, a friction welding process still inserting or attaching sheet metal parts. The production according to the invention, which can advantageously also be applied to a casting process, involves a large potential for savings due to the reduced processes. The inventive concept simplifies or optimizes the production of one-piece steel pistons, which are preferably intended for high-speed, high-power diesel internal combustion engines, which reach a power level of> 80 KW / L, with ignition pressures of> 200 bar set.
Weitere vorteilhafte konstruktive Ausgestaltungen der Erfindung sind Gegenstand der unabhängigen, nachfolgend erläuterten Ansprüche.Further advantageous structural embodiments of the invention are the subject of the independent claims explained below.
Eine bevorzugte Gestaltung des erfindungsgemäßen Kolbens sieht vor, eine innere, der Brennraummulde zugeordnete Wandung des Kühlkanals zu verlängern. Der einen Ringabschnitt bildende, verlängerte Wandungsabschnitt ist nach dem Umformen bzw. dem Einbiegen mit einem freien Ende einer Stufe der äußeren Wandung des Kolbens zugeordnet. Vorteilhaft ist dazu der Ringabschnitt formschlüssig an der Außenwandung abgestützt. Dazu bietet es sich an, die äußere Wandung des Kolbens mit einem gestuften Abschnitt zu versehen, an dem der Ringabschnitt lagepositioniert ist.A preferred embodiment of the piston according to the invention provides to extend an inner, the combustion chamber trough associated wall of the cooling channel. The forming a ring portion, extended wall portion is assigned after forming or bending with a free end of a step of the outer wall of the piston. Advantageously, the ring portion is positively supported on the outer wall. For this purpose, it is advisable to provide the outer wall of the piston with a stepped portion on which the ring portion is positioned position.
Im Bereich des Schaftfensterbereichs schließt der Kolben erfindungsgemäß eine Anordnung von Aussparungen oder Durchbrüchen ein, als weitere Maßnahme zur Reduzierung der Kolbenmasse. Bevorzugt sind dazu versetzt zu einer Bolzennabe symmetrisch umfangsverteilte Bohrungen in den Schaftfensterbereich eingebracht, über die, ohne die Festigkeit des Kolbens zu gefährden, eine wirksame Gewichtsreduzierung erzielbar ist.In the region of the shaft window region, the piston according to the invention includes an arrangement of recesses or openings, as a further measure for reducing the piston mass. Preferably offset to a pin boss symmetrically circumferentially distributed holes are introduced into the shaft window area over which, without compromising the strength of the piston, an effective weight reduction can be achieved.
Der sich zumindest über eine Länge des Ringfeldes erstreckende Kühlkanal bildet bevorzugt ein weitestgehend rechteckförmiges Querschnittsprofil. Diese Gestaltung vergrößert vorteilhaft das Durchströmvolumen und damit die Kühlmittelaufnahme, wodurch die Kühlwirkung des Kolbens deutlich gesteigert werden kann. Außerdem verringert der großvolumig gestaltete Kühlkanal das Kolbengewicht. Gleichzeitig vergrößert diese Formgebung des Kühlkanals einen Freiheitsgrad zur Platzierung von Öffnungen zum Eintritt und Austritt des Kühlmittels in den Kühlkanal unter dem Gesichtspunkt einer optimalen Beaufschlagung.The cooling channel extending at least over a length of the annular field preferably forms a largely rectangular cross-sectional profile. This design advantageously increases the flow volume and thus the coolant intake, whereby the cooling effect of the piston can be significantly increased. In addition, the large-volume cooling channel reduces the weight of the piston. At the same time, this shape of the cooling channel increases one degree of freedom for placement from openings for entry and exit of the coolant in the cooling channel from the point of optimum application.
Ein weiteres Ausgestaltungsmerkmal der Erfindung sieht vor, die Wandungen des Kühlkanals mit nahezu gleicher Wandstärke auszulegen. Bedingt durch abgestimmte, weitestgehend übereinstimmende Wandstärken des Kühlkanals, kann ein strukturfester, höchsten Anforderungen standhaltender Kolben realisiert werden.Another embodiment feature of the invention provides to design the walls of the cooling channel with almost the same wall thickness. Due to tuned, largely matching wall thicknesses of the cooling channel, a structurally stable, highest requirements can be achieved by maintaining the piston.
Die Auslegung sowie das Herstellungsverfahren des erfindungsgemäßen Kolbens ermöglicht eine bevorzugte kleine Kompressionshöhe, die unmittelbar die Kolbenmasse beeinflußt. Vorteilhaft kann mit dem erfindungsgemäßen Kolben die Kompressionshöhe (S) von < 0,7 x Kolbendurchmesser (D) realisiert werden.The design as well as the manufacturing method of the piston according to the invention allows a preferred small compression height, which directly affects the piston mass. Advantageously, the compression height (S) of <0.7 x piston diameter (D) can be realized with the piston according to the invention.
Die nachfolgende Beschreibung erläutert ein in den Figuren 1 bis 3 dargestelltes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Kühlkanalkolbens.The following description explains an illustrated in Figures 1 to 3 embodiment of an inventively designed cooling channel piston.
Es zeigen:Show it:
Figur 1 : einen erfindungsgemäßen Kühlkanalkolben nach Umformung einer Wandung des Kühlkanals,FIG. 1 shows a cooling channel piston according to the invention after forming a wall of the cooling channel,
Figur 2: einen vergrößert abgebildeten Ausschnitt des Kolbens gemäß Figur 1 ,FIG. 2 shows an enlarged section of the piston according to FIG. 1,
Figur 3: den Kühlkanalkolben gemäß Fig. 1 nach Fertigstellung.Figure 3: the cooling channel piston of FIG. 1 after completion.
Die Figur 1 zeigt einen einteiligen, als Kühlkanalkolben gestalteten Kolben 1 in einer Perspektive in Verbindung mit einem Teilausschnitt. Der mittels eines Schmiedeoder Gießverfahrens hergestellte Kolben 1 ist als ein Kolbenrohling dargestellt, der zentrisch in einem Kolbenboden 2 eine vor oder fertiggeformte Brennraummulde 3 bildet. An den Kolbenboden 2 schließt sich an einem Außenmantel des Kolbens 1 ein in Figur 3 abgebildeter Feuersteg 4 an, dem ein Ringfeld 5 sowie ein Schaft 6 folgt. Ein in dem Kolben 1 integrierter, umlaufend angeordneter Kühlkanal 7 wird seitlich von einer inneren, der Brennraummulde 3 zugeordneten Wandung 8 und einer äußeren, dem Ringfeld 5 zugeordneten Wandung 9 begrenzt. Ein einstückig mit der inneren Wandung 8 verbundener, durch eine Umformung abgewinkelter Ringabschnitt 10 verschließt den Kühlkanal 7 und bildet dabei gleichzeitig einen Kolbenbodenbereich 11. Ein freies Ende des Ringabschnitts 10 ist unter Bildung einer Fuge 12 an einer Stufe 13 der äußeren Wandung 9 abgestützt. Eine Abdichtung der Fuge 12 erfolgt mittels einer Schweißung oder Hartlötung. Der Schaft 6 des Kolbens 1 schließt zwei diametral gegenüberliegende Bolzennaben 14 ein, die jeweils eine Nabenbohrung 15 einschließt. Versetzt zu den Bolzennaben 14 sind in einem Schaftfensterbereich 16 des Schafts 6 weiterhin symmetrisch umfangsverteilte Aussparungen 17 zur Gewichtseinsparung eingebracht.1 shows a one-piece, designed as a cooling channel piston piston 1 in perspective in conjunction with a partial section. The piston 1 produced by means of a forging or casting process is shown as a piston blank, which forms a pre-formed or finished combustion bowl 3 centrally in a piston head 2. At the piston head 2 is followed on an outer jacket of the piston 1 in a truncated 3 illustrated in Fig 3, to which a ring field 5 and a shaft 6 follows. An integrated in the piston 1, circumferentially arranged cooling channel 7 is laterally from an inner, the combustion bowl 3 associated wall 8 and an outer, the ring field 5 associated wall 9 limited. An integrally connected to the inner wall 8, bent by a deformation ring portion 10 closes the cooling channel 7, while forming a piston crown portion 11. A free end of the ring portion 10 is supported to form a joint 12 at a stage 13 of the outer wall 9. A seal of the joint 12 by means of a weld or brazing. The shaft 6 of the piston 1 includes two diametrically opposed pin bosses 14, each including a hub bore 15. Offset to the pin bosses 14, symmetrically circumferentially distributed recesses 17 for weight saving are further introduced in a shaft window region 16 of the shaft 6.
In der Figur 2 ist ein Ausschnitt des Kolbens 1 als Kolbenrohling in einem vergrößerten Maßstab abgebildet. Die innere Wandung 8 des Kühlkanals 7 ist danach durch den Ringabschnitt 10 verlängert, der in einem anschließenden Verfahrensschritt bis zur Anlage an die Stufe 13 der Wandung 9 eingebogen bzw. umgeformt wird.FIG. 2 shows a section of the piston 1 as a piston blank on an enlarged scale. The inner wall 8 of the cooling channel 7 is then extended by the annular portion 10, which is inflected or deformed in a subsequent process step until it rests against the step 13 of the wall 9.
Der Kolben 1 als Fertigteil ist in Figur 3 abgebildet. Diese Darstellung zeigt weitere Details des Kolbens 1 , wie das für Kolbenringe bestimmte Ringfeld 5, das sich an den Feuersteg 4 anschließt. Der Kühlkanal 7 besitzt eine Längserstreckung, die weitestgehend mit der Länge des Ringfeldes 5 übereinstimmt und zumindest eine Randzone des Feuerstegs 4 einschließt. Weiterhin verdeutlicht diese Darstellung die Gestaltung des Kühlkanals 7, der von Wandungen 8, 9, 10 sowie 19 nahezu gleicher Wandstärke umschlossen ist sowie in diesem Fall ein weitestgehend rechteckförmiges Querschnittsprofil aufweist, bzw. durch die geometrische Form der fertiggedrehten Mulde 3, des Kolbenbodens 11 , des Ringfeldes 5 und der Innenform 19 durch Einhaltung gleichmäßig dünner Wandungen gebildet wird. Insbesondere die Anordnung des Kühlkanals 7 bewirkt eine gewünschte verringerte, ein Abstandsmaß zwischen einer Nabenachse 18 und dem Kolbenboden 2 definierende Kompressionshöhe „S". BezugszeichenlisteThe piston 1 as a finished part is shown in FIG. This illustration shows further details of the piston 1, such as the designated for piston rings ring field 5, which adjoins the top land 4. The cooling channel 7 has a longitudinal extent, which largely coincides with the length of the ring field 5 and includes at least one edge zone of the top land 4. Furthermore, this illustration illustrates the design of the cooling channel 7, which is surrounded by walls 8, 9, 10 and 19 almost the same wall thickness and in this case has a largely rectangular cross-sectional profile, or by the geometric shape of the finished rotated trough 3, the piston head 11, of the ring field 5 and the inner mold 19 is formed by adherence uniformly thin walls. In particular, the arrangement of the cooling channel 7 causes a desired reduced, a distance between a hub axle 18 and the piston head 2 defining compression height "S". LIST OF REFERENCE NUMBERS
1. Kolben1st piston
2. Kolbenboden2nd piston bottom
3. Brennraummulde3rd combustion chamber
4. Feuersteg4th Flank
5. Ringfeld5. Ring field
6. Schaft6th shaft
7. Kühlkanal7. Cooling channel
8. Wandung8. wall
9. Wandung9. wall
10. Ringabschnitt10th ring section
11. Kolbenbodenbereich11. Piston bottom area
12. Fuge12th fugue
13. Stufe13th stage
14. Bolzennabe14th pin hub
15. Nabenbohrung15. Hub bore
16. Schaftfensterbereich16. shaft window area
17. Aussparung17. recess
18. Nabenachse18. hub axle
19. Kolbeninnenform 19. piston inner mold

Claims

P A T E N T A N S P R Ü C H E PATENT APPLICATIONS
1. Verfahren zur Herstellung eines einteiligen Kolbens (1) aus Stahl mit kleiner1. A method for producing a one-piece piston (1) made of steel with smaller
Kompressionshöhe für eine Brennkraftmaschine, der einen zu einem Ringfeld (5) benachbarten Kühlkanal (7) einschließt, wobei mittels eines Schmiede- oder eines Gießverfahrens in einem ersten Verfahrensschritt ein Kolbenrohling hergestellt wird und zur Bildung eines Kühlkanals (7) eine verlängerte Wandung (8) des Kühlkanals (7) umgeformt wird, dadurch gekennzeichnet, dass der zwischen dem Ringfeld (5), der Innenform (19) und einer Brennraummulde (3) angeordnete Kühlkanal (7) durch Umformen oder Einbiegen eines Kolbenbodenbereichs (11) geschlossen und eine sich einstellende Fuge (12) mittels einer Schweißung oder Hartlötung abgedichtet wird und in einem Schaftfensterbereich (16) der Kolben (1) zumindest eine Aussparung (17) einschließt.Compression height for an internal combustion engine, which includes a cooling channel (7) adjacent to a ring field (5), wherein a piston blank is produced by means of a forging or a casting process in a first method step and an elongate wall (8) is formed to form a cooling channel (7). the cooling channel (7) is formed, characterized in that between the annular field (5), the inner mold (19) and a combustion chamber trough (3) arranged cooling channel (7) closed by forming or bending a piston head region (11) and a self-adjusting Joint (12) is sealed by means of a weld or brazing and in a shaft window region (16) of the piston (1) includes at least one recess (17).
2. Kolben (1), vorzugsweise hergestellt nach dem Verfahren gemäß Anspruch 1 , dadurch gekennzeichnet, dass eine freies Ende einer inneren, der Brennraummulde (3) zugeordneten, als ein Ringabschnitt (10) gestalteten Wandung (8) des Kühlkanals (7) durch Umformen mit einer äußeren Kolbenwandung (9) zusammenwirkt.2. Piston (1), preferably produced by the method according to claim 1, characterized in that a free end of an inner, the combustion chamber trough (3) associated, designed as a ring portion (10) wall (8) of the cooling channel (7) Forming with an outer piston wall (9) cooperates.
3. Kolben (1) nach Anspruch 2, dadurch gekennzeichnet, dass der Ringabschnitt (10) an einem gestuften Abschnitt der äußeren Kolbenwandung (9) abgestützt ist.3. piston (1) according to claim 2, characterized in that the annular portion (10) on a stepped portion of the outer piston wall (9) is supported.
4. Kolben (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der zu einer Bolzennabe (14) versetzte Schaftfensterbereich (16) zur Bildung von Aussparungen (7) symmetrisch umfangsverteilt eingebrachte Bohrungen einschließt. 4. Piston (1) according to claim 2 or 3, characterized in that to a pin boss (14) offset shaft window portion (16) to form recesses (7) symmetrically circumferentially distributed introduced bores.
5. Kolben (1) nach Anspruch 2, 3 oder 4, dadurch gekennzeichnet, dass der sich zumindest über eine Länge des Ringfeldes (5) erstreckende Kühlkanal (7) ein weitestgehend rechteckförmiges Querschnittsprofil mit gleichmäßig dünnen Wandstärken zu den begrenzenden Außengeometrien aufweist.5. piston (1) according to claim 2, 3 or 4, characterized in that at least over a length of the annular field (5) extending cooling channel (7) has a largely rectangular cross-sectional profile with uniformly thin wall thicknesses to the limiting outer geometries.
6. Kolben (1) nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass der Kühlkanal (7) von Wandungen (8, 9, 10, 19) nahezu gleicher Wandstärke eingeschlossen ist.6. piston (1) according to one of claims 2 to 5, characterized in that the cooling channel (7) of walls (8, 9, 10, 19) is enclosed almost the same wall thickness.
7. Kolben (1) nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass für die Auslegung des Kolbens (1) eine Kompressionshöhe (S) von < 0,7 x Durchmesser (D) des Kolbens (1) vorgesehen ist. 7. piston (1) according to one of claims 2 to 6, characterized in that for the design of the piston (1) a compression height (S) of <0.7 x diameter (D) of the piston (1) is provided.
EP07726101A 2006-07-07 2007-06-21 Cooling channel piston for an internal combustion engine and method for the production thereof Withdrawn EP2038078A1 (en)

Applications Claiming Priority (3)

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DE102006031892 2006-07-07
DE102007013183A DE102007013183A1 (en) 2006-07-07 2007-03-20 Cooling channel piston for an internal combustion engine
PCT/EP2007/005456 WO2008003401A1 (en) 2006-07-07 2007-06-21 Cooling channel piston for an internal combustion engine and method for the production thereof

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DE102007013183A1 (en) 2008-01-17
WO2008003401A1 (en) 2008-01-10

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