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EP2027381B1 - Multi-part cooled piston for an internal combustion engine - Google Patents

Multi-part cooled piston for an internal combustion engine Download PDF

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Publication number
EP2027381B1
EP2027381B1 EP07785519A EP07785519A EP2027381B1 EP 2027381 B1 EP2027381 B1 EP 2027381B1 EP 07785519 A EP07785519 A EP 07785519A EP 07785519 A EP07785519 A EP 07785519A EP 2027381 B1 EP2027381 B1 EP 2027381B1
Authority
EP
European Patent Office
Prior art keywords
piston
cooling channel
upper region
threaded bolt
combustion engine
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.)
Not-in-force
Application number
EP07785519A
Other languages
German (de)
French (fr)
Other versions
EP2027381A2 (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
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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.
  • 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 lower part 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 with 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. 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 support 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 is larger by a certain tolerance than the outer diameter of the cylindrical end face 24 of the support web 20, so that a trouble-free mounting of the piston upper part 2 is ensured on the piston lower part 6.
  • 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 piston top and bottom 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)

Description

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.From the publication DE 102 57 022 A1 is known 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 lower part 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 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 with 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. 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 größter 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 support 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 that the inner diameter of the recess 23 is larger by a certain tolerance than the outer diameter of the cylindrical end face 24 of the support web 20, so that a trouble-free mounting of the piston upper part 2 is ensured on the piston lower part 6.

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.During 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 piston top and bottom 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.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kolbenpiston
22
KolbenoberteilPiston crown
33
Verbrennungsmuldecombustion bowl
44
Ringwandring wall
55
Ringpartiering belt
66
KolbenunterteilPiston part
77
Kolbenschaftpiston shaft
88th
Bolzennabepin boss
99
Bolzenbohrungpin bore
1010
äußerer Kühlkanalouter cooling channel
1111
innerer Kühlkanalinner cooling channel
1212
Zuflussöffnunginflow opening
1313
Überlaufkanal, BohrungOverflow channel, bore
1414
Ablaufbohrungdrain hole
1515
Auflagefläche des Kolbenoberteils 2Support surface of the piston upper part 2
1616
Auflagefläche des Kolbenunterteils 6Support surface of the piston lower part 6
1717
Tragrippesupporting rib
1818
Querschnittsfläche des Kolbenoberteils 2Cross sectional area of the piston upper part 2
1919
Querschnittsfläche des Kolbenunterteils 6Cross-sectional area of the piston lower part 6
2020
Tragstegcarrying web
2121
innere Auflageinner edition
2222
äußere Auflageouter edition
2323
Ausnehmung der Ringwand 4Recess of the annular wall. 4
2424
Stirnseite des Tragsteges 20Front side of the support web 20
2525
Kolbenachsepiston axis
2626
SacklochbohrungBlind hole
2727
Ende des Gewindebolzens 29End of the threaded bolt 29
2828
Innengewinde der Sacklochbohrung 26Internal thread of the blind hole 26th
2929
Gewindebolzenthreaded bolt
3030
Außengewinde des Gewindebolzens 29External thread of the threaded bolt 29
3131
Bereich zwischen der Tragrippe 17Area between the support rib 17
3232
Schaft des Gewindebolzens 29Shaft of the threaded bolt 29

Claims (1)

  1. Multi-part cooled piston (1) for an internal combustion engine comprising a piston upper part (2) which has a ring wall (4) with ring zone (5) and a piston lower part (6) which comprises a box-shaped piston shaft (7) with two pin bosses (8), wherein the piston lower part (6) forms, together with the piston upper part (2), an outer ring-shaped cooling channel (10) and also an inner ring-shaped cooling channel (11) arranged concentrically thereto, wherein the inner cooling channel (11) is covered by an upper region (31) of the piston lower part (6), said upper region (31) being formed thin-walled such that said upper region (31) is deformable in the manner of a disk spring and wherein a blind bore (26) with an internal thread (28) is introduced into the lower side of the piston upper part (2), centrally and coaxially with the piston axis (25),
    characterised in that the upper region (31) of the piston lower part (6) has a threaded bolt (29) with an external thread (30) directed upwardly and formed integrally with the upper region (31) of the piston lower part (6) and arranged centrally and coaxially with the piston axis (25), wherein the internal thread (28) matches the external thread (30) so that the piston upper part (2) can be screwed, via the blind bore (26) and via the threaded bolt (29), onto the piston lower part (6).
EP07785519A 2006-06-13 2007-06-08 Multi-part cooled piston for an internal combustion engine Not-in-force 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 EP2027381A2 (en) 2009-02-25
EP2027381B1 true EP2027381B1 (en) 2010-08-18

Family

ID=38626907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07785519A Not-in-force 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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DE102008045456A1 (en) * 2008-09-02 2010-03-04 Mahle International Gmbh Piston for an internal combustion engine
DE102009027148B4 (en) 2009-06-24 2015-02-12 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine with cooling duct system
JP5365700B2 (en) * 2009-11-25 2013-12-11 トヨタ自動車株式会社 Piston for internal combustion engine and internal combustion engine
DE102010009891A1 (en) * 2010-03-02 2011-09-08 Mahle International Gmbh Piston for an internal combustion engine
DE102011013139A1 (en) * 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine
US8973484B2 (en) * 2011-07-01 2015-03-10 Mahle Industries Inc. Piston with cooling gallery
WO2014015311A1 (en) * 2012-07-20 2014-01-23 Federal-Mogul Corporation Piston with oil cooling passage and method of construction thereof
CN102943717A (en) * 2012-12-06 2013-02-27 湖南江滨机器（集团）有限责任公司 Steel roof aluminum skirt combinational piston
KR101383121B1 (en) * 2013-07-01 2014-04-09 삼영기계주식회사 A piston assembly
CN105986923B (en) * 2015-02-09 2019-02-19 强哲菲 A kind of double oil pocket steel pistons and its processing method
US10294887B2 (en) * 2015-11-18 2019-05-21 Tenneco Inc. Piston providing for reduced heat loss using cooling media
CN113202654A (en) * 2021-05-18 2021-08-03 大昌汽车部件(苏州)有限公司 Combined engine piston and forging process thereof

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US2024269A (en) * 1933-06-20 1935-12-17 Bernard Renee Piston
US2198771A (en) * 1937-04-19 1940-04-30 Gen Motors Corp Welded two-piece light alloy piston
US2398577A (en) * 1944-06-01 1946-04-16 George V Bratzel Piston for internal-combustion engines
DE2914456A1 (en) 1979-04-10 1980-10-23 Schmidt Gmbh Karl BUILT PISTON FOR INTERNAL COMBUSTION ENGINES
DE3249290T1 (en) * 1981-12-28 1984-01-26 Alco Power Inc., 13021 Auburn, N.Y. COMPOSED PISTON
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DE4131275C2 (en) * 1991-09-20 1998-04-09 Mahle Gmbh Built liquid-cooled piston
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Also Published As

Publication number Publication date
CN101466937B (en) 2011-07-06
WO2007143969A2 (en) 2007-12-21
CN101466937A (en) 2009-06-24
WO2007143969A3 (en) 2008-02-28
EP2027381A2 (en) 2009-02-25
JP2009540201A (en) 2009-11-19
US20110155080A1 (en) 2011-06-30
DE102006027354A1 (en) 2007-12-20
DE502007004798D1 (en) 2010-09-30
KR20090018628A (en) 2009-02-20
US8201537B2 (en) 2012-06-19

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