EP0870103A1 - Piston plongeur a canal de refroidissement - Google Patents

Piston plongeur a canal de refroidissement

Info

Publication number
EP0870103A1
EP0870103A1 EP96945881A EP96945881A EP0870103A1 EP 0870103 A1 EP0870103 A1 EP 0870103A1 EP 96945881 A EP96945881 A EP 96945881A EP 96945881 A EP96945881 A EP 96945881A EP 0870103 A1 EP0870103 A1 EP 0870103A1
Authority
EP
European Patent Office
Prior art keywords
cooling channel
gap
piston
light metal
sheet
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
EP96945881A
Other languages
German (de)
English (en)
Other versions
EP0870103B1 (fr
Inventor
Karlheinz Bing
Martin RÜHLE
Fritz Warth
Heinz Wimmer
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 EP0870103A1 publication Critical patent/EP0870103A1/fr
Application granted granted Critical
Publication of EP0870103B1 publication Critical patent/EP0870103B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • 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
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a cast light metal piston for internal combustion engines with a cooling channel provided in the piston head.
  • a generic piston is known from DE-PS 37 21 021.
  • the annular cooling channel tube consists of an aluminum-treated or aluminum-treated material with high thermal conductivity.
  • the butt ends of the pipe are joined together by a welding process in order to obtain a perfect seal. Due to the aluminizing of the cooling duct pipe and the welding of the pipe ends, however, this represents an expensive solution.
  • the invention is concerned with the problem of improving the heat transfer between the piston material and the cooling channel and reducing the manufacturing costs of the cooling channel. This object is achieved by the features of the characterizing part of patent claim 1. Advantageous developments of the invention are the subject of the dependent claims.
  • a gap is formed between the piston base material and the sheet metal due to the different coefficients of thermal expansion. Due to the at least partially circumferential gap in the cooling channel, the gap between the cooling channel and the piston base material fills with cooling oil. This oil-filled gap leads to a significantly better heat transfer than an air-filled gap.
  • the sheet metal cooling duct according to the invention is that it can be produced cheaply in a sheet metal forming process and that the costs for the pretreatment of the cooling duct and for the sealing of the cooling duct are eliminated.
  • the cooling duct can be shaped by deep drawing with subsequent flanging.
  • the coefficient of thermal expansion of the cooling channel material is advantageously between 10 and 17. 10 1 / K, is therefore significantly lower than that of the piston base material.
  • the width of the at least partially circumferential gap in the cooling channel is preferably between 0.08 and 0.5 mm with a particularly preferred range from 0.08 to 0.2 mm.
  • the width of the gap is to be dimensioned such that the melt cannot flow through the gap into the interior of the cooling channel when the cooling channel is cast around it.
  • the sealing function can be further improved in that, in addition to a relatively narrow gap width, the butt ends of the sheet lie overlapping one another.
  • Fig. 1 shows a half section of the piston according to the invention
  • FIG. 2 shows a cross section through the cooling duct according to the invention, with a blunt joint.
  • This cooling channel 6 is produced by a sheet metal forming process.
  • two holding pins 8 mounted in the casting tool are used (shown offset in FIG. 1). These retaining pins 8 are arranged with respect to the circumference of the cooling channel 6 and connected to the latter in each case via a punched-out hole 9 in such a way that after the light-metal piston 1 has been produced and these retaining sleeves 8 have been removed, an inlet and outlet channel for the cooling liquid has been created .
  • the cooling channel 6 has a gap 7 on its upper side (not shown to scale, but enlarged) through which the interior of the cooling channel 6 is connected to the surroundings and through which in the operating state cooling oil can get into the gap between the outer wall of the duct and the piston base material, whereby the heat transfer between the base material and the cooling duct is considerably improved.
  • the penetration of the oil into the gap between the cooling channel and the base material is reduced by the gap in the downward stroke the oil acting deceleration forces and the resulting pressure build-up in the oil in the gap area accelerated.
  • this gap 7 is advantageously produced by butting the two sheet ends, but can also be produced by overlapping the sheet ends.
  • the cooling oil located in this gap is then pressed back into the cooling channel 6 due to the cooling of the piston - in which the base material contracts more than the material of the cooling channel.
  • the cross section of the ring channel does not necessarily have to be circular or oval, as shown in FIGS. 1 and 2.

Landscapes

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

Abstract

L'invention concerne un piston en métal léger dont la tête comprend un canal de refroidissement en tôle coulé dedans. L'invention vise à améliorer le transfert de chaleur entre le matériau constituant ledit piston et le canal de refroidissement, ainsi qu'à réduire les frais de production du canal de refroidissement. A cet effet, le canal de refroidissement comporte une fente mince laissant passer l'huile, qui s'étend au moins en partie le long de sa périphérie.
EP96945881A 1995-12-27 1996-11-12 Piston plongeur a canal de refroidissement Expired - Lifetime EP0870103B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19548811 1995-12-27
DE19548811A DE19548811A1 (de) 1995-12-27 1995-12-27 Tauchkolben mit Kühlkanal
PCT/DE1996/002172 WO1997024520A1 (fr) 1995-12-27 1996-11-12 Piston plongeur a canal de refroidissement

Publications (2)

Publication Number Publication Date
EP0870103A1 true EP0870103A1 (fr) 1998-10-14
EP0870103B1 EP0870103B1 (fr) 2000-03-08

Family

ID=7781473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96945881A Expired - Lifetime EP0870103B1 (fr) 1995-12-27 1996-11-12 Piston plongeur a canal de refroidissement

Country Status (5)

Country Link
US (1) US5947065A (fr)
EP (1) EP0870103B1 (fr)
JP (1) JP3945821B2 (fr)
DE (2) DE19548811A1 (fr)
WO (1) WO1997024520A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750021A1 (de) * 1997-11-12 1999-05-20 Mahle Gmbh Gekühlter Ringträger
US6019080A (en) * 1998-04-27 2000-02-01 Lagrone; John T. Ported piston
DE19839226A1 (de) * 1998-08-28 2000-03-02 Peter Pelz Kolben, insbesondere für einen Verbrennungsmotor mit Doppelkurbeltrieb
US7077077B2 (en) * 2001-07-06 2006-07-18 A.I.M.L. Gmbh Coolable annular support for intentionally cooled piston rings and method for the production thereof
DE10234539B4 (de) * 2002-07-30 2005-02-24 Ks Kolbenschmidt Gmbh Kolben mit einem offen vergossenen Kühlkanal-Ringträger und Verfahren zu seiner Herstellung
WO2004048765A1 (fr) * 2002-11-26 2004-06-10 Fritz Winter Eisengiesserei Gmbh & Co. Kg Composant coule destine a un moteur a combustion interne
US7406941B2 (en) 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
DE102008002571A1 (de) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
US8863647B2 (en) * 2011-05-04 2014-10-21 GM Global Technology Operations LLC Oil gallery piston with improved thermal conductivity
JP2018508691A (ja) * 2015-01-30 2018-03-29 フェデラル−モーグル・リミテッド・ライアビリティ・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｌｌｃ 冷却空洞冷却インサートを有するピストン、およびその構成方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE410200C (de) * 1922-11-25 1925-02-27 Hansa Lloyd Werke Akt Ges Verfahren zur Herstellung von Hohlkoerpern, insbesondere Verbrennungsraeumen oder Kanaelen fuer Verbrennungskraftmaschinen
US2282085A (en) * 1941-08-13 1942-05-05 American Locomotive Co Piston
FR1244830A (fr) * 1959-02-03 1960-10-28 Mahle Kg Piston en métal léger avec canaux de refroidissement et son procédé de fabrication
DE1955805A1 (de) * 1969-11-06 1971-05-19 Maschf Augsburg Nuernberg Ag Zylinder mit trockener Zylinderlaufbuechse
DE2624412C3 (de) * 1976-05-31 1983-12-01 Alcan Aluminiumwerk Nürnberg GmbH, 6000 Frankfurt Verfahren zur Herstellung von Kolben mit einem Ringkanal
DE3601383A1 (de) * 1986-01-18 1987-07-23 Kloeckner Humboldt Deutz Ag Kurbelgehaeuse mit eingegossenen kuehlraeumen
DE3721021A1 (de) * 1986-06-27 1988-01-21 Aisin Seiki Verfahren zur herstellung eines brennkraftmaschinenkolbens
US4907545A (en) * 1988-12-28 1990-03-13 Caterpillar Inc. Liquid cooled piston ring carrier assembly and piston using same
JPH09287517A (ja) * 1996-04-22 1997-11-04 Unisia Jecs Corp 内燃機関用ピストン及びその内燃機関用ピストンの金型

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9724520A1 *

Also Published As

Publication number Publication date
JP3945821B2 (ja) 2007-07-18
DE19548811A1 (de) 1997-07-03
DE59604627D1 (de) 2000-04-13
EP0870103B1 (fr) 2000-03-08
WO1997024520A1 (fr) 1997-07-10
US5947065A (en) 1999-09-07
JP2000502772A (ja) 2000-03-07

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