DE4131275A1 - Sectional fluid-cooled piston for I.C.- engine - has head accommodating piston rings connected by central screw arrangement to piston shaft - Google Patents

Sectional fluid-cooled piston for I.C.- engine - has head accommodating piston rings connected by central screw arrangement to piston shaft

Info

Publication number
DE4131275A1
DE4131275A1 DE4131275A DE4131275A DE4131275A1 DE 4131275 A1 DE4131275 A1 DE 4131275A1 DE 4131275 A DE4131275 A DE 4131275A DE 4131275 A DE4131275 A DE 4131275A DE 4131275 A1 DE4131275 A1 DE 4131275A1
Authority
DE
Germany
Prior art keywords
piston
head
shaft
expansion screw
support ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE4131275A
Other languages
German (de)
Other versions
DE4131275C2 (en
Inventor
Dieter Messmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle GmbH
Original Assignee
Mahle 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 GmbH filed Critical Mahle GmbH
Priority to DE4131275A priority Critical patent/DE4131275C2/en
Priority to FR9211183A priority patent/FR2681643B1/en
Publication of DE4131275A1 publication Critical patent/DE4131275A1/en
Application granted granted Critical
Publication of DE4131275C2 publication Critical patent/DE4131275C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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

The ignition forces introduced from the head (1) into the shaft via inner support ring surfaces (5) are supported inside the shaft via a hollow conical support ring (7) widening to the shaft end on to the nave of the shaft (2). Radially inside the hollow conical support ring is a collar (8) uncoupled from the ignition force support assembly for support of the expansion screw (3). The collar has the shape of a hollow cone widening to the head of the expansion screw. Between the head of the expansion screw and the collar is introduced a socket (4). USE/ADVANTAGE - To improve the durability of the fluid-cooled piston for an internal combustion engine.

Description

Die Erfindung betrifft einen gebauten flüssigkeitsge­ kühlten Kolben nach dem Oberbegriff des Patentan­ spruchs 1.The invention relates to a built liquid cooled pistons according to the preamble of the patent saying 1.

Ein solcher Kolben ist aus DE 37 19 469 A bekannt.Such a piston is known from DE 37 19 469 A.

Die Erfindung beschäftigt sich mit dem Problem, die Dauerfestigkeit der Zentralverschraubung zu verbes­ sern.The invention addresses the problem that Fatigue strength of the central screw connection too ser.

Gelöst wird diese Aufgabe durch eine Ausbildung einer solchen Zentralverschraubung nach den kennzeichnenden Merkmalen des Patentanspruchs 1.This task is solved by training a such central screwing according to the characteristic Features of claim 1.

Zweckmäßige Ausgestaltungen sind Gegenstand der Un­ teransprüche.Appropriate configurations are the subject of the Un claims.

Der wesentliche Vorteil der erfindungsgemäßen Lösung besteht darin, daß die Dehnschraube sich innerhalb des Schaftes an einem Schaftbereich abstützt, der nicht an der Zündkraftübertragung vom Kolbenkopf zu den Naben des Schaftes beteiligt ist. Dadurch ist die Dehnschraube einer geringen Wechsellast im Motorbe­ trieb unterworfen. Dies bedeutet wiederum, daß auf eine Federvorspannung, wie in der Ausführung nach der DE 37 19 469 A über Tellerfedern, verzichtet werden kann. Dies ist für die Dauerfestigkeit der Schraub-Verbindung insofern von Bedeutung als Tellerfedern unter der im Motorbetrieb herrschenden Temperatur ih­ re Spannkraft allmählich abbauen.The main advantage of the solution according to the invention is that the expansion screw is inside of the shaft is supported on a shaft area which not at the ignition power transmission from the piston head the hubs of the shaft is involved. This is the Expansion screw of a small alternating load in the engine urged subject. This in turn means that on a spring preload, as in the version after the  DE 37 19 469 A on disc springs, can be dispensed with can. This is for the fatigue strength of the screw connection insofar as important as disc springs under the temperature prevailing in engine operation ih Gradually reduce the tension.

Ein Ausführungsbeispiel ist in der Zeichnung, die ei­ nen gebauten Kolben im Längsschnitt zeigt, darge­ stellt.An embodiment is in the drawing, the egg NEN built piston shows in longitudinal section, Darge poses.

Der gebaute Kolben besteht aus einem mit Ringnuten versehenen Kolbenkopf 1 aus einem festigkeitsmäßig hoch belastbaren Material, wie beispielsweise Stahl und aus einem Kolbenschaft 2 aus beispielsweise Sphä­ roguß. Die Verbindung von Kolbenkopf 1 und Kolben­ schaft 2 erfolgt mittels einer zentral angeordneten Dehnschraube 3, die an ihrem einen Ende mit einem Ge­ winde versehen ist, das in dem Kolbenkopf 1 ein­ greift. An ihrem anderen Ende ist die Dehnschraube 3 mit einem Schraubenkopf versehen, über den sie sich an dem Kolbenschaft über eine zwischengeschaltete Hülse 4 abstützt.The built piston consists of a piston head 1 provided with annular grooves made of a material with a high strength, such as steel, and a piston skirt 2 made of, for example, spheroidal cast iron. The connection of piston head 1 and piston shaft 2 is carried out by means of a centrally located expansion screw 3 , which is provided at one end with a Ge thread which engages in the piston head 1 . At its other end, the expansion screw 3 is provided with a screw head, by means of which it is supported on the piston shaft via an intermediate sleeve 4 .

Die auf dem Kolbenkopf 1 einwirkenden Zündkräfte überträgt der Kolbenkopf 1 über einen radial inneren und einen radial äußeren Ringbereich 5 bzw. 6 auf den Kolbenschaft. Der innere Ringbereich 5 ist die dem Kolbenkopf zugewandte Auflagefläche eines hohlkegel­ förmigen Stützringes 7, der sich in Richtung des Schaftendes hin durchmessermäßig erweitert. Durch den Stützring 7 gelangen die von diesem übertragenen Zündkräfte direkt auf die Naben des Schaftes 2. The ignition forces acting on the piston head 1 are transferred to the piston skirt 1 via a radially inner and a radially outer ring region 5 or 6 . The inner ring area 5 is the bearing surface facing the piston head of a hollow cone-shaped support ring 7 , which widens in diameter in the direction of the shaft end. The ignition forces transmitted by the support ring 7 reach the hubs of the shaft 2 directly.

Im Bereich der Ringfläche 5 ist ein Kragen 8 nach ra­ dial innen an den Stützring 7 angeformt. Dieser Stützring 8 bildet radial innen das Auflager für die Hülse 4, die von der Dehnschraube 3 verspannt wird. Der Kragen 8 besitzt eine Hohlkegelform mit sich zum Kopf der Dehnschraube 3 hin verkleinerndem Durchmes­ ser. Der Kragen 8 liegt außerhalb des die Zündkräfte innerhalb des Stützringes 7 bewirkenden Kraftflusses.In the area of the ring surface 5 , a collar 8 is integrally formed on the support ring 7 after ra dial. This support ring 8 forms the support radially inside for the sleeve 4 , which is clamped by the expansion screw 3 . The collar 8 has a hollow cone shape with diminishing to the head of the expansion screw 3 diam. The collar 8 lies outside the force flow which causes the ignition forces within the support ring 7 .

Das Kühlöl wird von den Nabenbohrungen aus in den äu­ ßeren Kühlringkanal 10 eingeführt, von dem es durch Überlauföffnungen 11 in den zentralen Kühlraum 12 ge­ langt, den es über radiale Abflußbohrungen 13 inner­ halb der Hülse 4 verlassen kann.The cooling oil is introduced from the hub bores into the outer cooling ring channel 10 , from which it reaches ge through overflow openings 11 in the central cooling chamber 12 , which it can leave through half half of the sleeve 4 via radial drain holes 13 .

Claims (6)

1. Gebauter flüssigkeitsgekühlter Kolben für Ver­ brennungsmotoren, bestehend aus einem die Kolben­ ringe aufnehmenden Kolbenkopf und einem Kolben­ schaft, die durch eine Zentralverschraubung mit­ einander verbunden sind, bei dem der Kopf und der Schaft auf einem inneren radial innerhalb und ei­ nem äußeren radial außerhalb des Kolbenkopf­ schwerkreises liegenden Ringbereich aufeinander­ liegen, bei dem ferner in dem Bereich radial zwi­ schen diesen ringförmigen Auflagen ein an beide Teile angrenzender Kühlölringkanal vorgesehen ist, der durch den Abstützungsbereich hindurch mit einem zentralen sich zwischen Kopf und Schaft erstreckenden Kühlraum verbunden ist, wobei der zentrale Kühlraum einen zum Kurbelraum führenden Abfluß besitzt und bei dem die Zentralverschrau­ bung aus einer Dehnschraube besteht, die auf den Kolbenkopf im Motorbetrieb wirkende Massenkräfte aufnimmt und die mit ihrem einen ein Gewinde auf­ weisenden Ende in den Kolbenkopf eingreift, wäh­ rend sie sich mit dem sich an ihrem zweiten Ende befindlichen Schraubenkopf an dem Schaft ab­ stützt, gekennzeichnet durch die Merkmale
  • a) die über die innere Abstützungsringfläche (5) von dem Kopf (1) in den Schaft (2) eingelei­ teten Zündkräfte werden innerhalb des Schaf­ tes (2) über einen hohlkegelförmigen sich zum Schaftende hin erweiternden Stützring (7) auf die Naben des Schaftes (2) übertragen,
  • b) radial innerhalb des Hohlkegel-Stützringes (7) ist ein von der Zündkraftaufnahme abge­ koppelter Kragen (8) zur Abstützung der Dehn­ schraube (3) angeformt.
1.Built-up liquid-cooled piston for internal combustion engines, consisting of a piston head receiving the piston head and a piston shaft, which are connected by a central screw connection, in which the head and the shaft on an inner radially inside and an outer radially outside the Piston head gravity rice lying ring area lie one on top of the other, in the area radially between these annular supports a cooling oil ring channel adjacent to both parts is provided, which is connected through the support area to a central cooling space extending between the head and the shaft, the central cooling space has a drain leading to the crankcase and in which the central screwing consists of an expansion screw which absorbs inertial forces acting on the piston head during engine operation and which engages with a thread-pointing end in the piston head, while it engages with de m is located at its second end screw head on the shaft, characterized by the features
  • a) on the inner support ring surface ( 5 ) from the head ( 1 ) in the shaft ( 2 ) introduced ignition forces within the shaft ( 2 ) via a hollow cone-shaped support ring ( 7 ) widening towards the shaft end onto the hubs of the shaft ( 2 ) transferred,
  • b) radially inside the hollow cone support ring ( 7 ) is a collar ( 8 ) coupled from the ignition force absorption for supporting the expansion screw ( 3 ).
2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß der Kragen (8) die Form eines sich zum Kopf der Dehnschraube (3) hin erweiternden Hohlkegels besitzt.2. Piston according to claim 1, characterized in that the collar ( 8 ) has the shape of a hollow cone which widens towards the head of the expansion screw ( 3 ). 3. Kolben nach Anspruch 1 und 2, dadurch gekennzeichnet, daß zwischen dem Kopf der Dehnschraube (3) und dem Kragen (8) eine Hülse (4) eingesetzt ist. 3. Piston according to claim 1 and 2, characterized in that a sleeve ( 4 ) is inserted between the head of the expansion screw ( 3 ) and the collar ( 8 ). 4. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Hülse (4) mit mindestens einer den Abfluß aus dem inneren Kühlraum (12) bildenden radialen Bohrung (13) versehen ist.4. Piston according to one of the preceding claims, characterized in that the sleeve ( 4 ) is provided with at least one outflow from the inner cooling space ( 12 ) forming radial bore ( 13 ). 5. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich der innere Abstütz-Ringbereich (5) zwi­ schen etwa 0,1 und 0,7 des Durchmessers des Kol­ benkopfes (1) erstreckt.5. Piston according to one of the preceding claims, characterized in that the inner support ring region ( 5 ) extends between about 0.1 and 0.7's of the diameter of the piston head ( 1 ). 6. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die zwischen dem Kopf und dem Gewinde der Dehnschraube (3) befindliche Dehnlänge der Dehn­ schraube (3) zwischen etwa 10 und 30% des Kol­ benkopfdurchmessers beträgt.6. A piston according to one of the preceding claims, characterized in that the stretching length of the stretching located between the head and the thread of the expansion screw (3) bolt (3) of the Kol is between about 10 and 30% benkopfdurchmessers.
DE4131275A 1991-09-20 1991-09-20 Built liquid-cooled piston Expired - Lifetime DE4131275C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4131275A DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston
FR9211183A FR2681643B1 (en) 1991-09-20 1992-09-18 PISTON IN SEVERAL PARTS, COOLED BY A LIQUID.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4131275A DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston

Publications (2)

Publication Number Publication Date
DE4131275A1 true DE4131275A1 (en) 1993-03-25
DE4131275C2 DE4131275C2 (en) 1998-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE4131275A Expired - Lifetime DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston

Country Status (2)

Country Link
DE (1) DE4131275C2 (en)
FR (1) FR2681643B1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416120A1 (en) * 1994-05-06 1995-11-09 Mahle Gmbh Two or more part IC engine piston held together by three bolts
WO2001086133A1 (en) 2000-05-05 2001-11-15 Mahle Gmbh Combustion engine with a built-up piston
EP1213161A3 (en) * 2000-12-09 2002-12-11 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Trailer traction device
WO2004053319A1 (en) * 2002-12-06 2004-06-24 Mahle Gmbh Multipart cooled piston for an internal combustion engine
DE102005042003A1 (en) * 2005-09-05 2007-03-08 Mahle International Gmbh Built, liquid cooled flask
WO2007025529A1 (en) * 2005-09-01 2007-03-08 Mahle International Gmbh Two-piece piston for an internal combustion engine
US7628135B2 (en) 2005-12-23 2009-12-08 Mahle International Gmbh Multi-part piston for an internal combustion engine
US8201537B2 (en) 2006-06-13 2012-06-19 Mahle International Gmbh Multi-part cooled piston for an internal combustion engine
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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102559B (en) * 1995-03-09 1998-12-31 Waertsilae Nsd Oy Ab Piston unit at an internal combustion engine
ATE287495T1 (en) 2001-07-06 2005-02-15 A I M L Gmbh COOLABLE RING CARRIER FOR INTERNALLY COOLED PISTON RINGS AND METHOD FOR THE PRODUCTION THEREOF
DE102004027974A1 (en) * 2004-06-08 2005-12-29 Mahle Gmbh A built piston and method of preventing damage in contact surfaces of the top and bottom of the piston

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757668A1 (en) * 1976-12-30 1978-07-06 Cummins Engine Co Inc INSULATING MULTIPLE PISTON FOR 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
DE3719469A1 (en) * 1987-06-11 1988-12-29 Mahle Gmbh BUILT LIQUID-COOLED PISTON FOR COMBUSTION ENGINES
DE3830033A1 (en) * 1987-11-30 1989-06-08 Mahle Gmbh Built, oil-cooled piston for internal combustion engines

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DE281030C (en) *
FR1484865A (en) * 1966-06-10 1967-06-16 Mirrlees Nat Ltd Piston enhancements for internal combustion compression ignition engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757668A1 (en) * 1976-12-30 1978-07-06 Cummins Engine Co Inc INSULATING MULTIPLE PISTON FOR 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
DE3719469A1 (en) * 1987-06-11 1988-12-29 Mahle Gmbh BUILT LIQUID-COOLED PISTON FOR COMBUSTION ENGINES
DE3830033A1 (en) * 1987-11-30 1989-06-08 Mahle Gmbh Built, oil-cooled piston for internal combustion engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 61-234260 A., In: Patents Abstracts of Japan, M-570, March 10, 1987, Vol.11, No.78 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416120A1 (en) * 1994-05-06 1995-11-09 Mahle Gmbh Two or more part IC engine piston held together by three bolts
WO2001086133A1 (en) 2000-05-05 2001-11-15 Mahle Gmbh Combustion engine with a built-up piston
US6829977B2 (en) 2000-05-05 2004-12-14 Mahle Gmbh Combustion engine with a built-up piston
KR100754536B1 (en) * 2000-05-05 2007-09-04 말레 게엠베하 Combustion engine with a built-up piston
EP1213161A3 (en) * 2000-12-09 2002-12-11 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Trailer traction device
US6626450B2 (en) 2000-12-09 2003-09-30 Dr. Ing. H.C.F. Porsche Ag Bumper unit having a hitching towing arrangement and a method of making same
WO2004053319A1 (en) * 2002-12-06 2004-06-24 Mahle Gmbh Multipart cooled piston for an internal combustion engine
CN100339584C (en) * 2002-12-06 2007-09-26 玛勒有限公司 Multipart cooled piston for an internal combustion engine
US7946268B2 (en) 2005-09-01 2011-05-24 Mahle International Gmbh Two-part piston for an internal combustion engine
US8651084B2 (en) 2005-09-01 2014-02-18 Mahle International Gmbh Two-part piston for an internal combustion engine
WO2007025529A1 (en) * 2005-09-01 2007-03-08 Mahle International Gmbh Two-piece piston for an internal combustion engine
WO2007028364A1 (en) * 2005-09-05 2007-03-15 Mahle International Gmbh Liquid-cooled assembled piston
US7934482B2 (en) 2005-09-05 2011-05-03 Mahle International Gmbh Liquid-cooled composite piston
JP4838848B2 (en) * 2005-09-05 2011-12-14 マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング Prefabricated liquid cooled piston
DE102005042003A1 (en) * 2005-09-05 2007-03-08 Mahle International Gmbh Built, liquid cooled flask
US7628135B2 (en) 2005-12-23 2009-12-08 Mahle International Gmbh Multi-part piston for an internal combustion engine
US8201537B2 (en) 2006-06-13 2012-06-19 Mahle International Gmbh Multi-part cooled piston for an internal combustion engine
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

Also Published As

Publication number Publication date
FR2681643A1 (en) 1993-03-26
DE4131275C2 (en) 1998-04-09
FR2681643B1 (en) 1995-07-21

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