EP0141992A2 - Multi-part piston for internal-combustion engines, having a partly isolated cooling oil conduit - Google Patents

Multi-part piston for internal-combustion engines, having a partly isolated cooling oil conduit Download PDF

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Publication number
EP0141992A2
EP0141992A2 EP84111624A EP84111624A EP0141992A2 EP 0141992 A2 EP0141992 A2 EP 0141992A2 EP 84111624 A EP84111624 A EP 84111624A EP 84111624 A EP84111624 A EP 84111624A EP 0141992 A2 EP0141992 A2 EP 0141992A2
Authority
EP
European Patent Office
Prior art keywords
piston
ring
cooling oil
combustion engines
internal
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
EP84111624A
Other languages
German (de)
French (fr)
Other versions
EP0141992A3 (en
EP0141992B1 (en
Inventor
Bernd Fäustle
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
Publication of EP0141992A2 publication Critical patent/EP0141992A2/en
Publication of EP0141992A3 publication Critical patent/EP0141992A3/en
Application granted granted Critical
Publication of EP0141992B1 publication Critical patent/EP0141992B1/en
Expired legal-status Critical Current

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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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
    • 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
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • 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

Definitions

  • the invention relates to a multi-part piston for internal combustion engines according to the preamble of the claim.
  • the object of the invention is to find a reliable and simple fixation within the piston parts to be connected for a sheet metal ring to be inserted for the isolation of certain partial areas, in which neither the material properties of the piston part in question nor its material properties due to the type of connection of the ring to be introduced can be negatively influenced.
  • a suitable type of connection can, for. B. can be achieved in that the ring to be introduced is attached to the intermediate ring with screws. The screws are then screwed in on the side of the intermediate ring which faces outwards as seen from the inside of the cooling oil duct.
  • FIG. 1 An embodiment is shown in the drawing, which shows a cooling oil channel in longitudinal section through a two-part piston.
  • a steel piston crown 1 is attached to an aluminum piston lower part 2 by fastening means, not shown. Cooling oil flows through the annular space 3.
  • a slotted flexible ring 5 is introduced to shield a partial area 4 of the annular space 3. This ring 5 is via screws 6 on an intermediate ring 7 from z. B. steel fit between the piston crown 1 and the lower piston part 2.
  • the parting line 8 of the slotted ring 5 can be welded subsequently.
  • the ring 5 is preformed in such a way that after its assembly, it rests firmly against the piston wall region to be covered at its upper free end.

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

1. Multi-part piston for internal combustion engines with closed cooling oil passage (3) arranged in a connection zone between piston head and piston lower part in the vicinity of the piston ring grooves, in which passage, for the thermal insulation of the ring grooves, partial zones (4) are separated by at least one ring insert (5), characterised in that this ring insert (5) is connected with an intermediate ring (7) so as to be removable without destruction, and the intermediate ring (7) is clamped in between the piston head (1) and the piston lower part (2), which are connected with one another.

Description

Die Erfindung betrifft einen mehrteiligen Kolben für Verbrennungsmotoren nach dem Oberbegriff des Patentanspruchs.The invention relates to a multi-part piston for internal combustion engines according to the preamble of the claim.

Mit Kühlöl beaufschlagte Flächen in dem Kühlölkanal eines Kolbens lokal gegen die Wirkung des Kühlöls zu isolieren ist z. B. aus DE-OS 29 30 079 und DE-G 81 32 778 bekannt. In beiden Fällen wird die Isolierung durch die Ausbildung eines Hohlraumes mit Hilfe eines zusätzlich in den Kolben einzubringenden Blechringes erreicht. Dabei ist die Ausführung nach dem DE-G 81 32 778 auf Fälle ausgerichtet, in denen die abzudeckende Fläche in einem hinterschnittenen Ringraum liegt. In diesem Fall muß nämlich der einzubringende Blechring während der Montage verformbar sein, da er sonst in die Hinterschnitträume nicht eingebracht werden kann. Die Verformbarkeit kann dabei z. B. durch ein achsiales Schlitzen des Ringes erfolgen. Bei der Lösung nach dem genannten Gebrauchsmuster besteht eine Schwierigkeit jedoch darin, den eingebrachten Blechring an dem entsprechenden Kolbenteil betriebssicher zu fixieren, ohne durch die Art der Fixierung das mechanische Verhalten des betreffenden Kolbenteiles unter Betriebslast negativ zu beeinflussen. Eine solche negative Beeinflussung ergibt sich z. B. durch ein Anschweißen des Blechringes an das betreffende Kolbenteil. Durch eine an dem oberen und unteren Ende des einzubringenden Blechringes vorgenommene feste Verbindung mit dem betreffenden Kolbenteil kann auch das rechnerisch vorbestimmte elastische Verhalten dieses Kolbenteiles unter Betriebsbedingungen negativ beeinflußt werden.Areas that are acted upon by cooling oil in the cooling oil channel of a piston are to be isolated locally against the action of the cooling oil. B. from DE-OS 29 30 079 and DE-G 81 32 778 known. In both cases, the insulation is achieved by forming a cavity with the aid of a sheet metal ring which is also to be inserted into the piston. The design according to DE-G 81 32 778 is aimed at cases in which the area to be covered lies in an undercut annular space. In this case, the sheet metal ring to be inserted must be deformable during assembly, since otherwise it cannot be inserted into the undercut spaces. The deformability can z. B. by axial slitting of the ring. In the solution according to the utility model mentioned, however, there is a difficulty in securely fixing the introduced sheet metal ring to the corresponding piston part without adversely affecting the mechanical behavior of the piston part in question under operating load due to the type of fixation. Such a negative Influence arises e.g. B. by welding the sheet metal ring to the relevant piston part. The arithmetically predetermined elastic behavior of this piston part under operating conditions can also be negatively influenced by a firm connection made to the piston part in question at the upper and lower ends of the sheet metal ring to be introduced.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, für einen zur Isolierung bestimmter Teilbereiche einzubringenden Blechring eine in jeder Hinsicht betriebssichere und einfache Fixierung innerhalb der zu verbindenden Kolbenteile zu finden, bei der weder die Werkstoffeigenschaften des betreffenden Kolbenteiles, noch dessen Materialeigenschaften durch die Art der Verbindung des einzubringenden Ringes negativ beeinflußt werden können.Proceeding from this, the object of the invention is to find a reliable and simple fixation within the piston parts to be connected for a sheet metal ring to be inserted for the isolation of certain partial areas, in which neither the material properties of the piston part in question nor its material properties due to the type of connection of the ring to be introduced can be negatively influenced.

Gelöst wird diese Aufgabe gemäß den Merkmalen des Patentanspruchs durch die Verwendung eines zusätzlichen Zwischenringes, der zwischen den zu verbindenden Kolbenteilen im Kühl- ölkanalbereich eingeklemmt ist und an den der in den Kühlölkanal einzubringende Ring zerstörungsfrei lösbar angebunden werden kann.This object is achieved according to the features of the patent claim by the use of an additional intermediate ring which is clamped between the piston parts to be connected in the cooling oil duct area and to which the ring to be introduced into the cooling oil duct can be detachably connected in a non-destructive manner.

Eine zweckmäßige Art der Verbindung kann z. B. dadurch erreicht werden, daß der einzubringende Ring an dem Zwischenring mit Schrauben befestigt ist. Die Schrauben werden dann an der Seite des Zwischenringes eingeschraubt, die von dem Inneren des Kühlölkanals aus gesehen nach außen weist.A suitable type of connection can, for. B. can be achieved in that the ring to be introduced is attached to the intermediate ring with screws. The screws are then screwed in on the side of the intermediate ring which faces outwards as seen from the inside of the cooling oil duct.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt, die einen Kühlölkanal im Längsschnitt durch einen zweiteiligen Kolben zeigt.An embodiment is shown in the drawing, which shows a cooling oil channel in longitudinal section through a two-part piston.

Ein Stahl-Kolbenboden 1 ist durch nicht dargestellte Befestiqunqsmittel auf einem Aluminiumkolbenunterteil 2 angebracht. Durch den Ringraum 3 strömt Kühlöl. Zur Abschirmung eines Teilbereiches 4 des Ringraumes 3 ist ein geschlitzter biegsamer Ring 5 eingebracht. Dieser Ring 5 ist über Schrauben 6 an einem Zwischenring 7 aus z. B. Stahl passungsgenau zwischen dem Kolbenboden 1 und dem Kolbenunterteil 2 eingeklemmt. Die Trennfuge 8 des geschlitzten Ringes 5 kann nachträglich verschweißt werden. Der Ring 5 ist so vorgeformt, daß er nach seiner Montage an seinem oberen freien Ende fest an dem abzudeckenden Kolbenwandbereich anliegt.A steel piston crown 1 is attached to an aluminum piston lower part 2 by fastening means, not shown. Cooling oil flows through the annular space 3. A slotted flexible ring 5 is introduced to shield a partial area 4 of the annular space 3. This ring 5 is via screws 6 on an intermediate ring 7 from z. B. steel fit between the piston crown 1 and the lower piston part 2. The parting line 8 of the slotted ring 5 can be welded subsequently. The ring 5 is preformed in such a way that after its assembly, it rests firmly against the piston wall region to be covered at its upper free end.

Claims (1)

Mehrteiliger Kolben für Verbrennungsmotoren mit in einem Verbindungsbereich in der Nähe der Kolbenringnuten angeordnetem geschlossenen Kühlölkanal (3), in dem zur Wärmeisolation Teilbereiche (4) durch mindestens eine Ring-(5) Einlage abgetrennt sind, dadurch gekennzeichnet, daß diese Ring- (5) Einlagen mit einem oder jeweils einem zwischen miteinander in Verbindung stehenden Kolbenteilen eingeklemmten zusätzlichen Zwischenring (7) zerstörungsfrei lösbar verbunden sind.Multi-part piston for internal combustion engines with a closed cooling oil channel (3) arranged in a connection area near the piston ring grooves, in which partial areas (4) are separated by at least one ring (5) insert for thermal insulation, characterized in that these ring (5) Deposits with one or in each case an additional intermediate ring (7) clamped between interconnected piston parts are detachably connected in a non-destructive manner.
EP84111624A 1983-10-26 1984-09-28 Multi-part piston for internal-combustion engines, having a partly isolated cooling oil conduit Expired EP0141992B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3338809 1983-10-26
DE3338809 1983-10-26

Publications (3)

Publication Number Publication Date
EP0141992A2 true EP0141992A2 (en) 1985-05-22
EP0141992A3 EP0141992A3 (en) 1986-05-21
EP0141992B1 EP0141992B1 (en) 1988-05-04

Family

ID=6212749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111624A Expired EP0141992B1 (en) 1983-10-26 1984-09-28 Multi-part piston for internal-combustion engines, having a partly isolated cooling oil conduit

Country Status (3)

Country Link
EP (1) EP0141992B1 (en)
JP (1) JPS60111048A (en)
DE (1) DE3470908D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288464A3 (en) * 2001-08-30 2003-08-20 Caterpillar Inc. Piston assembly for free piston internal combustion engine
WO2013156442A1 (en) * 2012-04-18 2013-10-24 Mahle International Gmbh Piston for an internal combustion engine
WO2017087433A1 (en) * 2015-11-18 2017-05-26 Federal-Mogul Corporation Piston providing for reduced heat loss using cooling media

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB348084A (en) * 1928-11-09 1931-04-28 Hugo Junkers Improvements in and relating to pistons for engines
DE1905029A1 (en) * 1969-02-01 1970-08-06 Augsburg Nuernberg Ag Zweignie Pistons for direct injection internal combustion engines
DE3017787A1 (en) * 1980-05-09 1981-11-12 Klöckner-Humboldt-Deutz AG, 5000 Köln IC engine piston with ceramic crown - has sheet metal discs interposed between skirt and crown to form piston ring recess

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB348084A (en) * 1928-11-09 1931-04-28 Hugo Junkers Improvements in and relating to pistons for engines
DE1905029A1 (en) * 1969-02-01 1970-08-06 Augsburg Nuernberg Ag Zweignie Pistons for direct injection internal combustion engines
DE3017787A1 (en) * 1980-05-09 1981-11-12 Klöckner-Humboldt-Deutz AG, 5000 Köln IC engine piston with ceramic crown - has sheet metal discs interposed between skirt and crown to form piston ring recess

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288464A3 (en) * 2001-08-30 2003-08-20 Caterpillar Inc. Piston assembly for free piston internal combustion engine
WO2013156442A1 (en) * 2012-04-18 2013-10-24 Mahle International Gmbh Piston for an internal combustion engine
US9726109B2 (en) 2012-04-18 2017-08-08 Mahle International Gmbh Piston for an internal combustion engine
WO2017087433A1 (en) * 2015-11-18 2017-05-26 Federal-Mogul Corporation Piston providing for reduced heat loss using cooling media
US10294887B2 (en) 2015-11-18 2019-05-21 Tenneco Inc. Piston providing for reduced heat loss using cooling media

Also Published As

Publication number Publication date
EP0141992A3 (en) 1986-05-21
EP0141992B1 (en) 1988-05-04
JPS60111048A (en) 1985-06-17
DE3470908D1 (en) 1988-06-09

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