EP1027535B1 - Piston with a central cooling chamber - Google Patents

Piston with a central cooling chamber Download PDF

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Publication number
EP1027535B1
EP1027535B1 EP98951264A EP98951264A EP1027535B1 EP 1027535 B1 EP1027535 B1 EP 1027535B1 EP 98951264 A EP98951264 A EP 98951264A EP 98951264 A EP98951264 A EP 98951264A EP 1027535 B1 EP1027535 B1 EP 1027535B1
Authority
EP
European Patent Office
Prior art keywords
piston
pin
cooling chamber
sheet
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.)
Expired - Lifetime
Application number
EP98951264A
Other languages
German (de)
French (fr)
Other versions
EP1027535A1 (en
Inventor
Klaus Keller
Peter Kemnitz
Carmen Klusch
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 EP1027535A1 publication Critical patent/EP1027535A1/en
Application granted granted Critical
Publication of EP1027535B1 publication Critical patent/EP1027535B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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 
    • F02F3/16—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

Definitions

  • a disadvantage of this construction is that Sheet metal has a complicated shape. Another The disadvantage of the known construction is that for strength reasons not all pistons have the possibility on the inner hubs a support surface for a support Creating sheet metal.
  • the invention is therefore concerned with the problem of a Piston with a central cold room and one the lower one To create the wall of the refrigerator forming sheet metal, in which the mentioned disadvantages do not exist and in particular one simple sheet metal as the lower cold room wall is sufficient.
  • the sheet metal has a defined one toward the hub supports Gap or cutouts that a controlled Allow cooling oil to drain.
  • the location of these drain openings can advantageously be chosen so that expiring Oil also lubricates the piston pin bore.

Description

Die Erfindung betrifft einen Kolben für einen Verbrennungsmotor mit einem Kolbenboden und einem unterhalb des Kolbenbodens liegenden zentralen Kühlraum. Aus dem JP-GM 60-125338 ist ein derartiger Kolben bekannt. Die untere Wand des Kühlraums wird durch ein unter Federvorspannung am Kolben befestigtes Blech gebildet. Dabei stützt sich das Blech mittels angeformter Laschen im oberen Bereich der Innennaben ab.The invention relates to a piston for an internal combustion engine with a piston crown and one below the piston crown central cold room. From the JP-GM Such a piston is known from 60-125338. The lower one Wall of the refrigerator is closed by a spring preload Piston attached sheet metal formed. This is supported Sheet metal using molded tabs in the upper area of the inner hubs from.

Ein Nachteil dieser Konstruktion besteht darin, daß das Blech eine komplizierte Formgebung aufweist. Ein weiterer Nachteil der bekannten Konstruktion ist es, daß aus Festigkeitsgründen nicht bei allen Kolben die Möglichkeit besteht, an den inneren Naben eine Auflagefläche für ein abzustützendes Blech zu schaffen.A disadvantage of this construction is that Sheet metal has a complicated shape. Another The disadvantage of the known construction is that for strength reasons not all pistons have the possibility on the inner hubs a support surface for a support Creating sheet metal.

Eine weitere Möglichkeit zur Schaffung eines zentralen Kühlraumes zeigt die WO 88/04725. Dabei ist im Bereich zwischen den Nabenabstützungen eines Gelenkkolbens ein Blech am Kolben angeschraubt. Insbesondere das Gewindeschneiden und die sichere Befestigung der Schrauben erfordern jedoch einen erheblichen Aufwand.Another way to create a central Cold room shows WO 88/04725. It is in the range between a sheet metal to the hub supports of an articulated piston screwed to the piston. Especially thread cutting and the secure fastening of the screws, however, require a considerable effort.

Die Erfindung beschäftigt sich daher mit dem Problem, einen Kolben mit einem zentralen Kühlraum und einem die untere Wand des Kühlraums bildenden Blech zu schaffen, bei dem die genannten Nachteile nicht vorliegen und insbesondere ein einfaches Blech als untere Kühlraumwand genügt.The invention is therefore concerned with the problem of a Piston with a central cold room and one the lower one To create the wall of the refrigerator forming sheet metal, in which the mentioned disadvantages do not exist and in particular one simple sheet metal as the lower cold room wall is sufficient.

Diese Aufgabe wird bei gattungsgemäßen Kolben gelöst durch eine Ausbildung mit den kennzeichnenden Merkmalen des Anspruchs 1 bzw. 5. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.This task is solved by generic pistons training with the characterizing features of the claim 1 and 5. Advantageous further developments are the subject of subclaims.

Das aus Federstahl bestehende Blech wird durch den oberhalb der Bolzennabe liegenden Bolzen gestützt und vorgespannt, so daß es an seinen Enden mit definierter Anlagekraft an den die Naben miteinander verbindenden Stegen anliegt.The spring steel sheet is replaced by the above the bolt-lying bolt is supported and pretensioned, so that it ends up with a defined contact force the webs connecting the hubs abuts.

Der das Blech abstützende Bolzen kann wie in Fig. 3 dargestellt als Hohlkörper hergestellt sein oder auch aus Vollmaterial bestehen. Als Bolzenwerkstoff wird bevorzugt Stahl eingesetzt.The bolt supporting the sheet can be shown in FIG. 3 be produced as a hollow body or also from solid material consist. Steel is preferred as the bolt material used.

Die den Bolzen aufnehmende Bohrung kann einseitig auch als Sacklochbohrung ausgeführt sein.The bore receiving the bolt can also be used on one side Blind hole must be executed.

Eine Bearbeitung der Flächen, an denen das Blech anliegt, ist nicht notwendig.Machining the surfaces on which the sheet lies is not necessary.

Gleichzeitig kann die Lage des Blechs relativ zum Kolben durch eine in das Blech eingeformte Sicke, mit der das Blech am Bolzen anliegt, exakt definiert werden, verglichen mit Blechen, deren Einbaulage durch Anlage an der relativ unpräzisen Innenform des Kolbens definiert ist.At the same time, the position of the sheet relative to the piston through a bead molded into the sheet metal, with which the The sheet is in contact with the bolt, exactly defined, compared with metal sheets, the installation position of which is based on the relative imprecise inner shape of the piston is defined.

Bei Bedarf kann durch Lagevariation des das Blech abstützenden Bolzens in Richtung der Kolbenlängsachse und Anpassung der Blechform bei unveränderter Kolbeninnenform das Volumen des zentralen Kühlraums verändert werden. If necessary, by varying the position of the sheet metal Pin in the direction of the piston longitudinal axis and adjustment the sheet metal shape with the piston inside shape unchanged Volume of the central cold room can be changed.

Zu den Nabenabstützungen hin weist das Blech einen definierten Spalt oder Aussparungen auf, die ein kontrolliertes Ablaufen des Kühlöls ermöglichen. Die Lage dieser Ablauföffnungen kann ggfs. vorteilhaft so gewählt werden, daß ablaufendes Öl auch die Kolbenbolzenbohrung schmiert.The sheet metal has a defined one toward the hub supports Gap or cutouts that a controlled Allow cooling oil to drain. The location of these drain openings can advantageously be chosen so that expiring Oil also lubricates the piston pin bore.

Zwar ist es aus der DE 40 39 754 bekannt, ein den äußeren Kühlkanal begrenzendes Blechteil durch einen in der Nabenabstützung eingepreßten Spannstift abzustützen, wobei das Blech mit einer Stirnseite bzw. Kante auf dem Bolzen aufliegt und dadurch eine erhebliche Kantenpressung auftritt, ein erfindungsgemäß zwischen den beiden Nabenabstützungen verlaufender Bolzen bzw. Spannstift, gegen den sich das Blech auf seiner gesamten Breite abstützt, ist daraus jedoch nicht ableitbar.It is known from DE 40 39 754, the outer one Sheet metal part that delimits the cooling channel through a hub support to support pressed-in roll pin, whereby the sheet with an end face or edge on the bolt rests and there is a significant edge pressure, an invention between the two hub supports running bolt or dowel against which supports the sheet across its entire width however not derivable.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels näher erläutert. Es zeigt:

Fig. 1
einen erfindungsgemäßen Kolben im Querschnitt in Kolbenbolzenrichtung
Fig. 2
eine Untersicht des erfindungsgemäßen Kolbens
Fig. 3
einen Querschnitt in Druck-Gegendruckrichtung
Fig. 4
ein weiteres Ausführungsbeispiel mit einer Spannhülse anstatt eines Bolzens.
The invention is explained in more detail below using an exemplary embodiment. It shows:
Fig. 1
a piston according to the invention in cross section in the piston pin direction
Fig. 2
a bottom view of the piston according to the invention
Fig. 3
a cross section in the pressure-counter pressure direction
Fig. 4
a further embodiment with an adapter sleeve instead of a bolt.

Ein ölgekühlter Kolben 1 weist einen Kolbenboden 2 und einstückig mit diesem durch Nabenabstützungen 3 verbundene Naben 4 und einen Kolbenschaft 5 auf. In den Kolbenboden 2 sind ein äußerer Kühlkanal 6 und ein zentraler Kühlraum 7 eingeformt, die nach unten durch Bleche 8 und 9 abgeschlossen sind. Das Kühlöl wird über den äußeren Kühlkanal 6 zugeführt, läuft durch Bohrungen in den zentralen Kühlraum 7 und läuft durch einen definierten Spalt zwischen Blech 9 und Nabenabstützung 3 aus dem zentralen Kühlraum ab.An oil-cooled piston 1 has a piston head 2 and in one piece with this connected by hub supports 3 hubs 4 and a piston skirt 5. In the piston crown 2 are an outer cooling duct 6 and a central cooling space 7 molded in, which is completed at the bottom by sheets 8 and 9 are. The cooling oil is supplied via the outer cooling channel 6, runs through holes in the central cold room 7 and runs through a defined gap between sheet 9 and hub support 3 from the central cold room.

Das den zentralen Kühlraum 6 abschließende Blech 9 wird durch einen oberhalb des Bolzenauges in die Nabenabstützungen 3 eingepreßten Bolzen 10 nach oben federnd gegen die die Nabenabstützungen 3 verbindenden Stege 11 gedrückt. Der Bolzen 10 liegt dabei in einer Sicke 12 des Blechs 9. Dadurch wird eine exakte Positionierung des Blechs relativ zum Kolben gewährleistet. Im Bereich seiner Enden ist das Blech an die Kontur der Stege 11 und deren Übergänge hin zu der Nabenabstützung angepaßt, indem die Ecken nach unten gezogen sind.The sheet 9 that closes off the central cooling space 6 through one above the bolt eye into the hub supports 3 pressed in bolts 10 resiliently against the the webs 11 connecting the hub supports 3 are pressed. The Bolt 10 lies in a bead 12 of the sheet 9 an exact positioning of the sheet becomes relative guaranteed to the piston. That is in the area of its ends Sheet metal to the contour of the webs 11 and their transitions the hub support adjusted by the corners down have moved.

Fig. 4 zeigt einen erfindungsgemäßen Kolben, bei dem das Blech 9 anstatt von einem Bolzen 10 mittels einer Spannhülse 13 abgestützt wird. Dargestellt ist in Fig. 4 auch der - prinzipiell bei allen Ausführungsbeispielen vorhandene-Kolbenbolzen 14 und es ist ein Pleuel angedeutet.Fig. 4 shows a piston according to the invention, in which the Sheet 9 instead of a bolt 10 by means of an adapter sleeve 13 is supported. 4 also shows the - In principle, piston bolts present in all exemplary embodiments 14 and a connecting rod is indicated.

Claims (6)

  1. Piston (1) for an internal-combustion engine with a gudgeon pin (14) mounted in pin hubs and a piston head (2) and with hub supports (3) between piston head (2) and pin hubs (4) and a central cooling chamber (7) which can be loaded with oil and is located beneath the piston head (2), at least the lower wall of the cooling chamber (7) being formed by a metal sheet (9) fixed under spring bias to the piston (1), characterised by the features
    above the piston head (14) the piston (1) has at least one second pin (10) of thinner diameter connected to the piston (1) and extending substantially in the direction of the gudgeon pin axis between the hub supports (3)
    the metal sheet (9) forming the lower wall of the central cooling chamber (7) is resiliently supported against the second pin (10).
  2. Piston according to claim 1, characterised in that a bead (12) with which the sheet (9) is supported against the second pin (10) is formed substantially in the centre of the metal sheet (9).
  3. Piston according to claim 1 or 2, characterised in that the piston head (2) of the piston (1) consists of steel.
  4. Piston according to any of the preceding claims, characterised by the articulated piston design.
  5. Piston according to the preamble of claim 1, characterised by the features
    above the piston head (14) the piston (1) has at least one fixing sleeve (13) connected to the piston (1) and extending substantially in the direction of the piston head axis between the hub supports (3),
    the metal sheet (9) forming the lower wall of the central cooling chamber (7) is resiliently supported against the fixing sleeve (13).
  6. Piston according to claim 5, characterised in that a bead (12) with which the sheet (9) is supported against the fixing sleeve (13) is formed substantially in the centre of the metal sheet (9).
EP98951264A 1997-10-30 1998-08-29 Piston with a central cooling chamber Expired - Lifetime EP1027535B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19747944A DE19747944A1 (en) 1997-10-30 1997-10-30 Piston with a central cold room
DE19747944 1997-10-30
PCT/DE1998/002595 WO1999023380A1 (en) 1997-10-30 1998-08-29 Piston with a central cooling chamber

Publications (2)

Publication Number Publication Date
EP1027535A1 EP1027535A1 (en) 2000-08-16
EP1027535B1 true EP1027535B1 (en) 2002-07-17

Family

ID=7847098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98951264A Expired - Lifetime EP1027535B1 (en) 1997-10-30 1998-08-29 Piston with a central cooling chamber

Country Status (6)

Country Link
US (1) US6202619B1 (en)
EP (1) EP1027535B1 (en)
JP (1) JP4169477B2 (en)
BR (1) BR9813312A (en)
DE (2) DE19747944A1 (en)
WO (1) WO1999023380A1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747944A1 (en) 1997-10-30 1999-05-06 Mahle Gmbh Piston with a central cold room
DE19926568A1 (en) * 1999-06-11 2000-12-14 Mahle Gmbh Cooled pistons for internal combustion engines
DE10013395C1 (en) * 2000-03-17 2001-08-02 Ks Kolbenschmidt Gmbh Method for producing a one-piece cooling channel piston, in particular for a diesel engine, and a one-piece cooling channel piston produced thereafter
DE10106435A1 (en) * 2001-02-13 2002-08-14 Bayerische Motoren Werke Ag Pistons, in particular for an internal combustion engine
US8276563B2 (en) * 2002-06-28 2012-10-02 Cummins, Inc. Internal combustion engine piston
DE10244511A1 (en) * 2002-09-25 2004-04-15 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
ATE413936T1 (en) * 2003-03-01 2008-11-15 Ks Kolbenschmidt Gmbh PRODUCTION PROCESS FOR A COOLING DUCT PISTON WITH A FORMABLE COLLAR
DE10325917A1 (en) 2003-06-07 2005-03-31 Mahle Gmbh Piston for an internal combustion engine and casting process for its production
DE102004031513A1 (en) * 2004-06-30 2006-01-26 Ks Kolbenschmidt Gmbh Method for producing a cooling channel piston for an internal combustion engine
US7104183B2 (en) * 2004-07-07 2006-09-12 Karl Schmidt Unisia, Inc. One-piece steel piston
US10450998B2 (en) * 2004-10-25 2019-10-22 Industrial Parts Depot, Llc One piece cast ferrous crown piston for internal combustion engine
US20060086326A1 (en) * 2004-10-25 2006-04-27 Ipd, Inc. One piece cast ferrous crown piston for internal combustion engine
US20070074695A1 (en) * 2005-10-04 2007-04-05 Mahle Technology, Inc. Piston having improved cooling characteristics
DE102008055848A1 (en) * 2008-11-04 2010-05-06 Ks Kolbenschmidt Gmbh Cooling channel piston of an internal combustion engine with a closure element which closes the cooling channel
DE102011013139A1 (en) * 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine
DE102016225632A1 (en) 2016-12-20 2018-06-21 Mahle International Gmbh Piston of an internal combustion engine
DE102016225635A1 (en) * 2016-12-20 2018-06-21 Mahle International Gmbh Piston of an internal combustion engine
CN114645798B (en) * 2022-03-14 2023-02-28 北京理工大学 Piston pin hole bush structure

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US4506632A (en) * 1983-07-28 1985-03-26 Toyota Jidosha Kabushiki Kaisha Piston assembly with cooling lubricant reservoir defining member engaged to piston pin mounting bosses
JPS6030455A (en) 1983-07-29 1985-02-16 Toyota Motor Corp Piston for internal-combustion engine
JPS60125338A (en) 1983-12-12 1985-07-04 Hitachi Metals Ltd Production of permanent magnet alloy
JPS60125338U (en) * 1984-02-01 1985-08-23 トヨタ自動車株式会社 Piston for internal combustion engine
DE3708376A1 (en) * 1986-03-20 1987-09-24 Mahle Gmbh Multipart trunk piston for internal combustion engines
DE3643039A1 (en) * 1986-12-17 1988-06-30 Mahle Gmbh COOLABLE SUBMERSIBLE PISTON FOR COMBUSTION ENGINES
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DE3735590C1 (en) * 1987-10-21 1989-01-05 Mahle Gmbh Closing of holes in cast pistons resulting from the manufacturing process
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US5357920A (en) 1990-12-13 1994-10-25 Mahle Gmbh Cooled multi-component piston for internal combustion engines
DE4039754A1 (en) 1990-12-13 1992-06-17 Mahle Gmbh Multi-part cooled piston for IC engine - has hollow ring-shaped chamber in head part for cooling oil, closed at based
DE4446726A1 (en) * 1994-12-24 1996-06-27 Mahle Gmbh Process for producing a one-piece cooling channel piston
US5653204A (en) * 1996-05-21 1997-08-05 Caterpillar Inc. Piston assembly retaining device
DE19747944A1 (en) 1997-10-30 1999-05-06 Mahle Gmbh Piston with a central cold room
US5934174A (en) * 1998-10-02 1999-08-10 Cummins Engine Company, Inc. Lightweight articulated piston head and method of making the piston head
DE19846152A1 (en) * 1998-10-07 2000-04-13 Mahle Gmbh Piston with piston base made of forged steel and a cooling channel

Also Published As

Publication number Publication date
JP2001522018A (en) 2001-11-13
BR9813312A (en) 2000-08-22
US6202619B1 (en) 2001-03-20
JP4169477B2 (en) 2008-10-22
WO1999023380A1 (en) 1999-05-14
EP1027535A1 (en) 2000-08-16
DE59804835D1 (en) 2002-08-22
DE19747944A1 (en) 1999-05-06

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