EP2027381A2 - Multi-part cooled piston for an internal combustion engine - Google Patents

Multi-part cooled piston for an internal combustion engine

Info

Publication number
EP2027381A2
EP2027381A2 EP07785519A EP07785519A EP2027381A2 EP 2027381 A2 EP2027381 A2 EP 2027381A2 EP 07785519 A EP07785519 A EP 07785519A EP 07785519 A EP07785519 A EP 07785519A EP 2027381 A2 EP2027381 A2 EP 2027381A2
Authority
EP
European Patent Office
Prior art keywords
piston
piston part
threaded bolt
combustion engine
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.)
Granted
Application number
EP07785519A
Other languages
German (de)
French (fr)
Other versions
EP2027381B1 (en
Inventor
Rainer Scharp
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 EP2027381A2 publication Critical patent/EP2027381A2/en
Application granted granted Critical
Publication of EP2027381B1 publication Critical patent/EP2027381B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • 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-part piston for an internal combustion engine according to the preamble of claim.
  • the published patent application DE 102 57 022 A1 discloses a multi-part cooled piston for an internal combustion engine, which consists of a piston upper part and a piston lower part.
  • a threaded bolt is arranged, and in the upper region of the piston lower part a threaded bore is introduced, so that the two piston parts on the threaded bolt and the threaded bore are screwed together.
  • the upper portion of the piston lower part is in this case formed so thin-walled that it deforms plate spring-like when screwing piston upper part and piston lower part, so that on the threaded bolt and the threaded bore a bias is applied, which consolidates and secures the screw connection formed thereby.
  • the disadvantage here is that in the deformation of the upper portion of the piston bottom near the threaded hole voltage-related cracks can occur, which solve the screw and damage to the piston and thus the engine, in which the piston is installed, can lead.
  • the invention is based on the problem to avoid the mentioned disadvantage of the prior art.
  • the problem is solved with the standing in the characterizing part of claim characteristics.
  • a multi-part cooled piston 1 which consists of a piston upper part 2 with a combustion bowl 3 and an annular wall 4 with ring portion 5 and a piston base 6, a box-shaped piston shaft 7 and two associated pin bosses 8, each with a pin bore 9 has for receiving a piston pin, not shown in the figure.
  • the upper piston part 2 and the lower piston part 6 delimit an outer annular cooling channel 10 and an inner cooling channel 11 arranged concentrically therewith, wherein the outer cooling channel 10 has at least one inflow opening 12 for introducing cooling oil and is connected to the inner cooling channel 11 via at least one overflow channel 13 ,
  • the overflow channel 13 may be formed as a bore.
  • the inner cooling channel 11 has at least one drain hole 14, via which the cooling oil can escape from the inner cooling channel 11.
  • the upper piston part 2 and the lower piston part 6 can be made of steel.
  • the piston upper part 2 supports, on the one hand, an annular support surface 15 arranged on its underside on an upper support surface 16 of an annular support rib 17 of the piston lower part 6 and, on the other hand, a cross-sectional surface 18 located on the underside of the annular wall 4 on an upper cross-sectional surface 19 of an annular one Supporting web 20 of the piston lower part 6.
  • the support surfaces 15 and 16 form an inner, planar and horizontally arranged, or roof or plate-shaped support 21 and the cross-sectional surfaces 18 and 19 to the inner support 21 coaxially arranged and horizontally lying, or also roof-mounted. or dish-shaped outer pad 22.
  • the support web 20 is viewed in section as a radially inwardly and upwardly directed step, so that the piston upper part 2 via a in the inside the lower end of the annular wall 4 introduced and complementary to the supporting web 20 shaped recess 23 can be centered relative to the piston lower part 6 by the recess 23 of the annular wall 4 of the piston upper part 2 is pushed onto the support web 20 of the piston lower part 6.
  • the inner diameter of the recess 23 it is necessary for the inner diameter of the recess 23 to be larger by a specific tolerance than the outer diameter of the cylindrical end face 24 of the support web 20, so that trouble-free mounting of the piston upper part 2 on the piston lower part 6 is ensured.
  • the underside of the upper piston part 2 has a centrally located and coaxial with the piston axis 25 blind hole 26 with internal thread 28.
  • the region 31 between the annular support rib 17 of the piston lower part 6, which defines the inner cooling channel 11 together with the piston upper part 2, is formed relatively thin-walled and is provided in its center with a coaxial with the piston axis 25 and upwardly directed threaded bolt 29, the upper End 27 has an external thread 30 which fits into the internal thread 28 of the blind hole 26.
  • the upper piston part 2 is centered over the recess 23 and the support web 20 relative to the lower piston part 6 and then rotated about the piston axis 25, wherein the blind hole 26 is screwed onto the threaded bolt 29.
  • the elasticity of the relatively thin-walled region 31 causes it to deform like a disk spring when the upper and lower piston parts are screwed together, ie, the inner center of the region 31 provided with the threaded bolt 29 bulges in the direction of the piston upper part 2.
  • the tensile stress exerted on the unthreaded shank 32 of the threaded bolt 29 during assembly leads to an elastic extension of the shank 29.

Landscapes

  • 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

Proposed is a multi-part cooled piston (1) for an internal combustion engine, which piston (1) is composed of an upper piston part (2) and a lower piston part (6). The upper piston part (2) forms an inner annular cooling duct (11) with the lower piston part (6), which cooling duct (11) is covered by an upper region (31) of the lower piston part (6). Said region (31) is of thin-walled design in such a way that it can be deformed in the manner of a plate spring. Simple and fast assembly of the upper piston part (2) on the lower piston part (6), and a fixed and secure screw connection between the two piston parts, result in that the upper piston part (2) is provided on its underside with a blind bore (26) which is arranged centrally and coaxially with respect to the piston axis (25) and has an internal thread (28), and in that the upper region (31) of the lower piston part (6) has a threaded bolt (29) which is arranged centrally and coaxially with respect to the piston axis (25), points upward and has an external thread (30), with the internal thread (28) matching the external thread (30), such that the upper piston part (2) can be screwed to the lower piston part (6) by means of the blind bore (26) and the threaded bolt.

Description

Mehrteiliger gekühlter Kolben für einen Verbrennungsmotor Multi-piece cooled piston for an internal combustion engine
Die Erfindung betrifft einen mehrteiligen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Patentanspruches.The invention relates to a multi-part piston for an internal combustion engine according to the preamble of claim.
Aus der Offenlegungsschrift DE 102 57 022 A1 ist ein mehrteiliger gekühlter Kolben für einen Verbrennungsmotor bekannt, der aus einem Kolbenoberteil und einem Kolbenunterteil besteht. Auf der Unterseite des Kolbenoberteils ist ein Gewindebolzen angeordnet, und in den oberen Bereich des Kolbenunterteils ist eine Gewindebohrung eingebracht, sodass die beiden Kolbenteile über den Gewindebolzen und die Gewindebohrung miteinander verschraubbar sind. Der obere Bereich des Kolbenunterteils ist hierbei derart dünnwandig ausgebildet, dass er sich beim Zusammenschrauben von Kolbenoberteil und Kolbenunterteil tellerfederartig verformt, sodass auf den Gewindebolzen und die Gewindebohrung eine Vorspannung ausgeübt wird, die die hierdurch gebildete Schraubverbindung festigt und sichert. Nachteilig ist hierbei, dass bei der Verformung des oberen Bereiches des Kolbenunterteils nahe der Gewindebohrung spannungsbedingte Risse auftreten können, die die Schraubverbindung lösen und zu einer Beschädigung des Kolbens und damit des Motors, in den der Kolben eingebaut ist, führen können.The published patent application DE 102 57 022 A1 discloses a multi-part cooled piston for an internal combustion engine, which consists of a piston upper part and a piston lower part. On the underside of the upper piston part, a threaded bolt is arranged, and in the upper region of the piston lower part a threaded bore is introduced, so that the two piston parts on the threaded bolt and the threaded bore are screwed together. The upper portion of the piston lower part is in this case formed so thin-walled that it deforms plate spring-like when screwing piston upper part and piston lower part, so that on the threaded bolt and the threaded bore a bias is applied, which consolidates and secures the screw connection formed thereby. The disadvantage here is that in the deformation of the upper portion of the piston bottom near the threaded hole voltage-related cracks can occur, which solve the screw and damage to the piston and thus the engine, in which the piston is installed, can lead.
Hiervon ausgehend liegt der Erfindung das Problem zugrunde, den erwähnten Nachteil des Standes der Technik zu vermeiden. Gelöst wird die Aufgabe mit den im Kennzeichen des Patentanspruches stehenden Merkmalen.On this basis, the invention is based on the problem to avoid the mentioned disadvantage of the prior art. The problem is solved with the standing in the characterizing part of claim characteristics.
Dadurch, dass an den dünnwandigen und tellerfederartig verformbaren Bereich des Kolbenunterteils ein Gewindebolzen angeformt ist, werden bei der Montage des Kolbens und bei der damit einhergehenden Verformung dieses Bereiches in Richtung Kolbenboden die dabei entstehenden Zugumfangsspannungen verringert, wodurch spannungsbedingte Risse in diesem Bereich weitgehend vermieden werden. Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnung beschrieben. Sie zeigt ein aus zwei Hälften bestehendes Schnittbild des erfindungsgemäßen Kolbens, wobei die linke Hälfte einen Halbschnitt des Kolbens in Richtung des Kolbenbolzens und die rechte Hälfte einen Halbschnitt des Kolbens in Druck- Gegendruck-Richtung darstellen.Characterized in that on the thin-walled and plate spring-like deformable region of the piston lower part a threaded bolt is formed in the assembly of the piston and the concomitant deformation of this area in the direction of the piston head thereby resulting Zugumfangsspannungen reduced, whereby voltage-related cracks in this area are largely avoided. An embodiment of the invention will be described below with reference to the drawing. It shows a two-half existing sectional view of the piston according to the invention, wherein the left half represent a half-section of the piston in the direction of the piston pin and the right half of a half-section of the piston in pressure-back pressure direction.
In der Figur ist ein mehrteiliger gekühlter Kolben 1 dargestellt, der aus einem Kolbenoberteil 2 mit einer Verbrennungsmulde 3 und mit einer Ringwand 4 mit Ringpartie 5 und aus einem Kolbenunterteil 6 besteht, das einen kastenförmigen Kolbenschaft 7 und zwei damit verbundene Bolzennaben 8 mit je einer Bolzenbohrung 9 zur Aufnahme eines in der Figur nicht dargestellten Kolbenbolzens aufweist. Das Kolbenoberteil 2 und das Kolbenunterteil 6 begrenzen einen äußeren ringförmigen Kühlkanal 10 und einen konzentrisch dazu angeordneten, inneren Kühlkanal 11 , wobei der äußere Kühlkanal 10 mindestens eine Zuflussöffnung 12 zum Einleiten von Kühlöl aufweist und über mindestens einen Überlaufkanal 13 mit dem inneren Kühlkanal 11 verbunden ist. Der Überlaufkanal 13 kann als Bohrung ausgebildet sein. Der innere Kühlkanal 11 weist mindestens eine Ablaufbohrung 14 auf, über die das Kühlöl aus dem inneren Kühlkanal 11 austreten kann. Hergestellt werden können das Kolbenoberteil 2 und das Kolbenunterteil 6 aus Stahl.In the figure, a multi-part cooled piston 1 is shown, which consists of a piston upper part 2 with a combustion bowl 3 and an annular wall 4 with ring portion 5 and a piston base 6, a box-shaped piston shaft 7 and two associated pin bosses 8, each with a pin bore 9 has for receiving a piston pin, not shown in the figure. The upper piston part 2 and the lower piston part 6 delimit an outer annular cooling channel 10 and an inner cooling channel 11 arranged concentrically therewith, wherein the outer cooling channel 10 has at least one inflow opening 12 for introducing cooling oil and is connected to the inner cooling channel 11 via at least one overflow channel 13 , The overflow channel 13 may be formed as a bore. The inner cooling channel 11 has at least one drain hole 14, via which the cooling oil can escape from the inner cooling channel 11. The upper piston part 2 and the lower piston part 6 can be made of steel.
Das Kolbenoberteil 2 lagert zum einen über eine auf dessen Unterseite angeordnete, ringförmige Auflagefläche 15 auf einer oberen Auflagefläche 16 einer ringförmigen Tragrippe 17 des Kolbenunterteils 6 und zum anderen über eine sich auf der Unterseite der Ringwand 4 befindliche Querschnittsfläche 18 auf einer oberen Querschnittsfläche 19 eines ringförmigen Tragsteges 20 des Kolbenunterteiles 6. Hierbei bilden die Auflageflächen 15 und 16 eine innere, ebene und horizontal angeordnete, beziehungsweise dach- oder tellerförmig ausgebildete Auflage 21 und die Querschnittsflächen 18 und 19 eine zur inneren Auflage 21 koaxial angeordnete und horizontal liegende, beziehungsweise ebenfalls dach- oder tellerförmig ausgebildete, äußere Auflage 22.The piston upper part 2 supports, on the one hand, an annular support surface 15 arranged on its underside on an upper support surface 16 of an annular support rib 17 of the piston lower part 6 and, on the other hand, a cross-sectional surface 18 located on the underside of the annular wall 4 on an upper cross-sectional surface 19 of an annular one Supporting web 20 of the piston lower part 6. Here, the support surfaces 15 and 16 form an inner, planar and horizontally arranged, or roof or plate-shaped support 21 and the cross-sectional surfaces 18 and 19 to the inner support 21 coaxially arranged and horizontally lying, or also roof-mounted. or dish-shaped outer pad 22.
Der Tragsteg 20 ist im Schnitt betrachtet als eine nach radial innen und aufwärts gerichtete Stufe ausgebildet, sodass das Kolbenoberteil 2 über eine in die Innenseite des unteren Endes der Ringwand 4 eingebrachte und komplementär zum Tragsteg 20 geformte Ausnehmung 23 gegenüber dem Kolbenunterteil 6 zentriert werden kann, indem die Ausnehmung 23 der Ringwand 4 des Kolbenoberteils 2 auf den Tragsteg 20 des Kolbenunterteils 6 geschoben wird. Hierbei ist es erforderlich, dass der Innendurchmesser der Ausnehmung 23 um ein bestimmtes Toleranzmaß größer ist als der Außendurchmesser der zylinderförmigen Stirnseite 24 des Tragsteges 20, damit eine problemlose Montage des Kolbenoberteils 2 auf das Kolbenunterteil 6 gewährleistet ist.The support web 20 is viewed in section as a radially inwardly and upwardly directed step, so that the piston upper part 2 via a in the inside the lower end of the annular wall 4 introduced and complementary to the supporting web 20 shaped recess 23 can be centered relative to the piston lower part 6 by the recess 23 of the annular wall 4 of the piston upper part 2 is pushed onto the support web 20 of the piston lower part 6. In this case, it is necessary for the inner diameter of the recess 23 to be larger by a specific tolerance than the outer diameter of the cylindrical end face 24 of the support web 20, so that trouble-free mounting of the piston upper part 2 on the piston lower part 6 is ensured.
Die Unterseite des Kolbenoberteils 2 weist eine mittig und koaxial zur Kolbenachse 25 angeordnete Sacklochbohrung 26 mit Innengewinde 28 auf. Der Bereich 31 zwischen der ringförmigen Tragrippe 17 des Kolbenunterteils 6, der gemeinsam mit dem Kolbenoberteil 2 den inneren Kühlkanal 11 begrenzt, ist relativ dünnwandig ausgebildet und ist in seiner Mitte mit einem koaxial zur Kolbenachse 25 angeordneten und nach oben gerichteten Gewindebolzen 29 versehen, dessen oberes Ende 27 ein Außengewinde 30 aufweist, das in das Innengewinde 28 der Sacklochbohrung 26 passt.The underside of the upper piston part 2 has a centrally located and coaxial with the piston axis 25 blind hole 26 with internal thread 28. The region 31 between the annular support rib 17 of the piston lower part 6, which defines the inner cooling channel 11 together with the piston upper part 2, is formed relatively thin-walled and is provided in its center with a coaxial with the piston axis 25 and upwardly directed threaded bolt 29, the upper End 27 has an external thread 30 which fits into the internal thread 28 of the blind hole 26.
Bei der Montage des Kolbens 1 wird das Kolbenoberteil 2 über die Ausnehmung 23 und den Tragsteg 20 gegenüber dem Kolbenunterteil 6 zentriert und dann um die Kolbenachse 25 gedreht, wobei die Sacklochbohrung 26 auf den Gewindebolzen 29 aufgeschraubt wird. Hierbei bewirkt die Elastizität des relativ dünnwandigen Bereiches 31 , dass dieser sich beim Zusammenschrauben von Kolbenober- und -unterteil wie eine Tellerfeder verformt, d.h., dass sich das innere, mit dem Gewindebolzen 29 versehene Zentrum des Bereiches 31 in Richtung Kolbenoberteil 2 aufwölbt. Zusätzlich führt die bei der Montage auf den gewindelosen Schaft 32 des Gewindebolzens 29 ausgeübte Zugspannung zu einer elastischen Verlängerung des Schaftes 29. Diese Verformungen sowohl des Bereiches 31 als auch des Schaftes 32 des Gewindebolzen 29 üben auf die Schraubverbindung (28, 30) eine Vorspannung aus, die insbesondere im Motorbetrieb eine feste Schraubverbindung zwischen dem Kolbenoberteil 2 und dem Kolbenunterteil 6 gewährleistet. BezugszeichenlisteDuring assembly of the piston 1, the upper piston part 2 is centered over the recess 23 and the support web 20 relative to the lower piston part 6 and then rotated about the piston axis 25, wherein the blind hole 26 is screwed onto the threaded bolt 29. In this case, the elasticity of the relatively thin-walled region 31 causes it to deform like a disk spring when the upper and lower piston parts are screwed together, ie, the inner center of the region 31 provided with the threaded bolt 29 bulges in the direction of the piston upper part 2. In addition, the tensile stress exerted on the unthreaded shank 32 of the threaded bolt 29 during assembly leads to an elastic extension of the shank 29. These deformations of both the region 31 and the shank 32 of the threaded bolt 29 exert a prestress on the threaded connection (28, 30) , which ensures a firm screw connection between the upper piston part 2 and the lower piston part 6, in particular during engine operation. LIST OF REFERENCE NUMBERS
1 Kolben1 piston
2 Kolbenoberteil2 piston upper part
3 Verbrennungsmulde3 combustion bowl
4 Ringwand4 ring wall
5 Ringpartie5 ring game
6 Kolbenunterteil6 piston lower part
7 Kolbenschaft7 piston shaft
8 Bolzennabe8 pin hub
9 Bolzenbohrung9 pin hole
10 äußerer Kühlkanal10 outer cooling channel
11 innerer Kühlkanal11 inner cooling channel
12 Zuflussöffnung12 inflow opening
13 Überlaufkanal, Bohrung13 overflow channel, bore
14 Ablaufbohrung14 drain hole
15 Auflagefläche des Kolbenoberteils 215 bearing surface of the piston upper part 2
16 Auflagefläche des Kolbenunterteils 616 supporting surface of the piston lower part 6
17 Tragrippe17 support rib
18 Querschnittsfläche des Kolbenoberteils 218 cross-sectional area of the piston upper part 2
19 Querschnittsfläche des Kolbenunterteils 619 cross-sectional area of the piston lower part 6
20 Tragsteg20 carrying bridge
21 innere Auflage21 inner edition
22 äußere Auflage22 outer edition
23 Ausnehmung der Ringwand 423 recess of the annular wall. 4
24 Stirnseite des Tragsteges 2024 front side of the support web 20th
25 Kolbenachse25 piston axis
26 Sacklochbohrung26 blind hole
27 Ende des Gewindebolzens 2927 end of the threaded bolt 29
28 Innengewinde der Sacklochbohrung 2628 internal thread of the blind hole 26th
29 Gewindebolzen29 threaded bolts
30 Außengewinde des Gewindebolzens 2930 external thread of the threaded bolt 29
31 Bereich zwischen der Tragrippe 1731 area between the support rib 17
32 Schaft des Gewindebolzens 29 32 shank of the threaded bolt 29

Claims

Patentanspruch claim
1. Mehrteiliger, gekühlter Kolben (1 ) für einen Verbrennungsmotor bestehend aus einem Kolbenoberteil (2), das eine Ringwand (4) mit Ringpartie (5) aufweist, und aus einem Kolbenunterteil (6), das einen kastenförmigen Kolbenschaft (7) mit zwei Bolzennaben (8) aufweist, wobei das Kolbenunterteil (6) mit dem Kolbenoberteil (2) einen äußeren, ringförmigen (10) und zudem einen konzentrisch dazu angeordneten, inneren ringförmigen Kühlkanal (11) bildet, und wobei der innere Kühlkanal (11 ) von einem oberen Bereich (31) des Kolbenunterteils (6) abgedeckt wird, der derart dünnwandig ausgebildet ist, dass er tellerfederartig verformbar ist, dadurch gekennzeichnet, dass in die Unterseite des Kolbenoberteils (2) eine mittig und koaxial zur Kolbenachse (25) angeordnete Sacklochbohrung (26) mit Innengewinde (28) eingebracht ist, und dass der obere Bereich (31) des Kolbenunterteils (6) einen mittig und koaxial zur Kolbenachse (25) angeordneten und nach oben gerichteten Gewindebolzen (29) mit Außengewinde (30) aufweist, wobei das Innengewinde (28) auf das Außengewinde (30) passt, sodass das Kolbenoberteil (2) über die Sacklochbohrung (26) und über den Gewindebolzen (29) mit dem Kolbenunterteil (6) verschraubbar ist. 1. Multi-part, cooled piston (1) for an internal combustion engine consisting of a piston upper part (2) having an annular wall (4) with ring portion (5), and from a piston lower part (6) having a box-shaped piston skirt (7) with two Bolzennaben (8), wherein the piston lower part (6) with the piston upper part (2) an outer, annular (10) and also concentrically arranged, inner annular cooling channel (11), and wherein the inner cooling channel (11) of a Upper area (31) of the piston lower part (6) is covered, which is formed so thin-walled that it is plate spring-like deformable, characterized in that in the underside of the piston upper part (2) has a centrally and coaxially to the piston axis (25) arranged blind hole (26 ) is introduced with internal thread (28), and that the upper portion (31) of the piston lower part (6) has a centrally and coaxially to the piston axis (25) arranged and upwardly directed threaded bolt (29) m it external thread (30), wherein the internal thread (28) on the external thread (30) fits, so that the piston upper part (2) via the blind hole (26) and via the threaded bolt (29) with the piston lower part (6) can be screwed.
EP07785519A 2006-06-13 2007-06-08 Multi-part cooled piston for an internal combustion engine Expired - Fee Related EP2027381B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027354A DE102006027354A1 (en) 2006-06-13 2006-06-13 Multi-piece cooled piston for an internal combustion engine
PCT/DE2007/001015 WO2007143969A2 (en) 2006-06-13 2007-06-08 Multi-part cooled piston for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2027381A2 true EP2027381A2 (en) 2009-02-25
EP2027381B1 EP2027381B1 (en) 2010-08-18

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Application Number Title Priority Date Filing Date
EP07785519A Expired - Fee Related EP2027381B1 (en) 2006-06-13 2007-06-08 Multi-part cooled piston for an internal combustion engine

Country Status (7)

Country Link
US (1) US8201537B2 (en)
EP (1) EP2027381B1 (en)
JP (1) JP2009540201A (en)
KR (1) KR20090018628A (en)
CN (1) CN101466937B (en)
DE (2) DE102006027354A1 (en)
WO (1) WO2007143969A2 (en)

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Also Published As

Publication number Publication date
WO2007143969A3 (en) 2008-02-28
JP2009540201A (en) 2009-11-19
US8201537B2 (en) 2012-06-19
CN101466937A (en) 2009-06-24
CN101466937B (en) 2011-07-06
WO2007143969A2 (en) 2007-12-21
US20110155080A1 (en) 2011-06-30
DE502007004798D1 (en) 2010-09-30
DE102006027354A1 (en) 2007-12-20
EP2027381B1 (en) 2010-08-18
KR20090018628A (en) 2009-02-20

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