EP1231450B1 - Aluminium heat exchanger - Google Patents

Aluminium heat exchanger Download PDF

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Publication number
EP1231450B1
EP1231450B1 EP01128289A EP01128289A EP1231450B1 EP 1231450 B1 EP1231450 B1 EP 1231450B1 EP 01128289 A EP01128289 A EP 01128289A EP 01128289 A EP01128289 A EP 01128289A EP 1231450 B1 EP1231450 B1 EP 1231450B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
exchanger according
mounting ring
threaded bushing
sealant
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
EP01128289A
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German (de)
French (fr)
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EP1231450A3 (en
EP1231450A2 (en
Inventor
Werner Heid
Gebhard Schwarz
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Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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Publication date
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Publication of EP1231450A2 publication Critical patent/EP1231450A2/en
Publication of EP1231450A3 publication Critical patent/EP1231450A3/en
Application granted granted Critical
Publication of EP1231450B1 publication Critical patent/EP1231450B1/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/0325—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
    • F28D1/0333—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0256—Arrangements for coupling connectors with flow lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0089—Oil coolers

Definitions

  • the invention relates to a heat exchanger, in particular a flat-tube oil cooler for motor vehicles, in brazed aluminum construction with threaded connection piece for the inlet and outlet of the medium to be cooled, preferably transmission oil.
  • Such a heat exchanger was by the EP-A 0 866 300 the applicant known.
  • These transmission oil coolers are constructed as Flachrohr- or disk oil cooler and each have an inlet and an outlet for the transmission oil, which are passed through the wall of the coolant box and sealed with respect to this. The transmission oil is thus cooled by the coolant flowing through the coolant / air cooler. All parts of the transmission oil cooler are made of aluminum, that is, the flat tubes, the turbulence inserts and the connecting piece - so the entire oil cooler can be soldered in one operation.
  • connection piece of two different materials, namely corrosion-resistant steel, that is stainless steel for the threaded portion and solderable aluminum material for the connection area, on the one hand, the desired corrosion resistance is achieved and on the other hand, the advantage maintained that the connection piece can be soldered together with the entire aluminum heat exchanger in one operation.
  • the steel part and the aluminum part of the connecting piece rotatably and are sealed together.
  • the aluminum part is designed as a fastening ring which holds the threaded bushing made of steel and at the same time allows a soldering with the heat exchanger.
  • a further serration or knurling between the aluminum and steel part is provided, whereby a higher torque between the two parts in the assembly and disassembly of the oil cooler and the pipe fitting is transferable.
  • the solder joint between the aluminum mounting ring and the aluminum heat exchanger is made possible by a solder disk, that is a coated on both sides with a solder alloy disc of an aluminum material or an aluminum alloy.
  • a solder disk that is a coated on both sides with a solder alloy disc of an aluminum material or an aluminum alloy.
  • a solderable sealant which is thus already attached before the soldering process, is a mounted in the steel body circumferential cutting rib, which digs into the softer aluminum material and thus already achieved a strong sealing effect.
  • a solderable sealant and a high temperature resistant epoxy or ceramic adhesive may be provided in the contact region of the aluminum and steel part, which is thus applied before mounting the threaded bushing and the mounting ring in the connecting region of both parts and then survives the soldering process harmless due to its high temperature resistance.
  • Such an epoxy resin may be provided in addition to the mentioned fin for complete sealing.
  • a sealant can be applied after the soldering process, which is not resistant to high temperatures and is introduced from the outside into the connection area of the steel and aluminum part.
  • Fig. 1 shows a transmission oil cooler 1, which consists of a stack of individual flat tubes 2, which are closed at the end by a fold 3.
  • turbulence plates 4 are arranged, which provide for a swirling of the oil and thus for improved heat transfer.
  • Between the individual flat tubes 2 further turbulence plates 5 are provided, which cause an improvement of the heat transfer on the outside, that is, the coolant side.
  • the oil cooler 1 has two connecting pieces 6 and 7, which are intended for the inlet and the outlet of the oil, that is, the medium to be cooled. Furthermore, these connection pieces are used to attach the oil cooler in Coolant box of a coolant cooler, not shown, as is known by the above-mentioned prior art.
  • the dot-dash line 8 marks the plane at which the transmission oil cooler 1 rests on the inside of the coolant tank, not shown, and is fixed.
  • the transmission oil thus enters, for example through the inlet nozzle 6 in the oil cooler, flows through the individual flat tubes 2 in parallel and leaves the oil cooler 1 again through the outlet nozzle 7.
  • the outer sides of the flat tubes 2 are acted upon by the coolant flowing through the coolant radiator.
  • the parts 2, 3, 4, 5 are made of an aluminum alloy, which is brazeable. The formation of the nozzles 6 and 7 (both are the same) is described below with reference to Fig. 2 described.
  • the Fig. 1a and 1b show the transmission oil cooler 1 in a view from below or a view from the side.
  • Fig. 2 shows a longitudinal section through the nozzle 6 in an enlarged view with a portion of the transmission oil cooler 1.
  • the connecting piece 6 is constructed in two parts, that is, on the one hand consists of a threaded connector 8, which is made of stainless steel, and a mounting ring 9, which consists of a solderable Aluminum alloy is made. Both parts 8 and 9 are rotatably and tightly connected to each other, as will be explained below.
  • a solder disk 12 is arranged, which consists of an aluminum alloy as the base material and is plated on both sides with a solder alloy. This solder disk 12 is provided for the soldering of the fastening ring 9 with the oil cooler 1.
  • solders would also be possible, for.
  • the installation of the oil cooler 1 in a coolant box of a coolant radiator, not shown completely is shown partially and in broken lines:
  • the mounting ring 9 has an end face 13 with an annular groove 14 which serves to receive an O-ring 15.
  • This end face 13 is located on the inside 16 of the plastic wall 17 (dashed lines) of a coolant box, not shown (the surface 16 corresponds to the level 8 in Fig. 1 ).
  • the connection piece 6 has a threaded portion 18 which extends through an opening 19 in the wall 17 to the outside.
  • a fastening nut 20 is screwed, which fixes the oil cooler 1 on the wall 17 and at the same time seals over the O-ring 15.
  • the over the fastening nut 20 outwardly projecting part of the threaded portion 18 serves to attach a pipe fitting, not shown, for the supply or removal of the transmission oil.
  • a tooth-shaped knurling or serration 23 ( Fig. 3 ); a similar knurling or serration 24 is provided for the cylindrical seat 22 on the surface 22 '.
  • a - thus a non-rotatable connection between the two parts is made, which is able to transmit torque occurring during assembly or disassembly on the oil cooler 1 via the solder joint.
  • the two parts 8 and 9 in the region of the cylindrical seat 21 and 22 must also be sealed. This is done by a in Fig.
  • the high-temperature-resistant sealant may be applied as a sealant, a two-component or one-component epoxy resin after the soldering process, in the region of a trough-shaped annular recess 29 which is located in the region of the cylindrical seat 22.
  • a sealant is applied in liquid form, then penetrates into the cylindrical seat 22, then hardens and thus causes a seal between the two parts 8 and 9.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

Flat oil cooler for a car has oil connections consisting of a threaded steel tube (8) with aluminum mounting rings (9) welded to them.

Description

Die Erfindung bezieht sich auf einen Wärmeübertrager, insbesondere einen Flachrohr-Ölkühler für Kraftfahrzeuge, in gelöteter Aluminiumbauweise mit Gewindeanschlußstutzen für den Ein- und Auslaß des zu kühlenden Mediums, vorzugsweise Getriebeöl.The invention relates to a heat exchanger, in particular a flat-tube oil cooler for motor vehicles, in brazed aluminum construction with threaded connection piece for the inlet and outlet of the medium to be cooled, preferably transmission oil.

Ein derartiger Wärmeübertrager wurde durch die EP-A 0 866 300 der Anmelderin bekannt. Diese Getriebeölkühler sind als Flachrohr- oder Scheibenölkühler aufgebaut und weisen jeweils einen Einlaß- und einen Auslaßstutzen für das Getriebeöl auf, die durch die Wand des Kühlmittelkastens hindurchgeführt und gegenüber diesem abgedichtet sind. Das Getriebeöl wird somit durch das Kühlmittel, welches durch den Kühlmittel/Luft-Kühler strömt, gekühlt. Sämtliche Teile des Getriebeölkühlers bestehen aus Aluminium, das heißt die Flachrohre, die Turbulenzeinlagen sowie die Anschlußstutzen - somit kann der gesamte Ölkühler in einem Arbeitsgang gelötet werden.Such a heat exchanger was by the EP-A 0 866 300 the applicant known. These transmission oil coolers are constructed as Flachrohr- or disk oil cooler and each have an inlet and an outlet for the transmission oil, which are passed through the wall of the coolant box and sealed with respect to this. The transmission oil is thus cooled by the coolant flowing through the coolant / air cooler. All parts of the transmission oil cooler are made of aluminum, that is, the flat tubes, the turbulence inserts and the connecting piece - so the entire oil cooler can be soldered in one operation.

Ein ähnlicher sogenannter Scheibenölkühler wurde durch die US-A 5,121,790 bekannt. Bei dieser Bauart werden die Strömungskanäle für das Öl durch paarweise angeordnete ineinander geschachtelte Scheiben gebildet, die ebenfalls aus Aluminium bestehen und zusammen mit etwaigen Turbulenzeinlagen und Anschlußstutzen in einem Arbeitsgang im Lötofen gelötet werden. An die Anschlußstutzen des Ölkühlers werden Ölleitungen über Schraubverbindungen angeschlossen, so daß die Enden der Anschlußstutzen ein Gewinde aufweisen müssen. Da der Gewindestutzen bei Aluminiumkühlern ebenfalls aus einem Aluminiumwerkstoff hergestellt ist, besteht die Gefahr, daß das Gewinde im Laufe der Zeit korrodiert und daß dann die Schraubverbindungen zwischen Anschlußstutzen und den Rohrleitungen für das Öl nicht mehr gelöst werden können bzw. das Gewinde beim Lösen zerstört wird - dies wird als Nachteil angesehen.A similar so-called disk oil cooler was by the US-A 5,121,790 known. In this design, the flow channels for the oil are formed by paired nested discs, which also consist of aluminum and are soldered together with any turbulence inserts and connecting pieces in a single pass in the soldering oven. To the connecting piece of the oil cooler oil lines are connected via screw, so that the ends of the Connecting pieces must have a thread. Since the threaded connector is also made of aluminum material for aluminum radiators, there is a risk that the thread will corrode over time and that then the screw connections between the connecting piece and the pipes for the oil can no longer be solved or the thread is destroyed when loosening - this is considered a disadvantage.

Es ist Aufgabe der vorliegenden Erfindung, einen Wärmeübertrager der eingangs genannten Art dahingehend zu verbessern, daß das Gewinde des Anschlußstutzens möglichst keiner Korrosion unterliegt und somit eine problemlose Demontage und Wiedermontage möglich ist.It is an object of the present invention to improve a heat exchanger of the type mentioned in that the thread of the connecting piece as possible is not subject to corrosion and thus easy disassembly and reassembly is possible.

Die Lösung dieser Aufgabe besteht in den Merkmalen des Patentanspruches 1. Dadurch, daß der Anschlußstutzen aus zwei verschiedenen Werkstoffen, nämlich korrosionsbeständigem Stahl, das heißt Edelstahl für den Gewindebereich und lötbarem Aluminiumwerkstoff für den Verbindungsbereich besteht, wird einerseits die gewünschte Korrosionsbeständigkeit erreicht und andererseits der Vorteil beibehalten, daß der Anschlußstutzen zusammen mit dem gesamten Aluminium-Wärmeübertrager in einem Arbeitsgang gelötet werden kann.The solution of this problem consists in the features of claim 1. The fact that the connecting piece of two different materials, namely corrosion-resistant steel, that is stainless steel for the threaded portion and solderable aluminum material for the connection area, on the one hand, the desired corrosion resistance is achieved and on the other hand, the advantage maintained that the connection piece can be soldered together with the entire aluminum heat exchanger in one operation.

In weiterer Ausgestaltung der Erfindung nach Anspruch 2 werden das Stahlteil und das Aluminiumteil des Anschlußstutzens drehfest und dicht miteinander verbunden. Dadurch wird der Vorteil erreicht, daß eine Befestigung des Ölkühlers mittels einer Befestigungsmutter am Kühlmittelkasten möglich ist, weil sich das Anzugsmoment der Befestigungsmutter über die drehfeste Verbindung über die Lötfläche zwischen dem Aluminiumteil der Gewindebuchse und dem Wärmeübertrager abstützen kann. Gleiches gilt für die Rohrverschraubung der Ölleitungen. Darüber hinaus wird eine Ölleckage verhindert.In a further embodiment of the invention according to claim 2, the steel part and the aluminum part of the connecting piece rotatably and are sealed together. Thereby, the advantage is achieved that an attachment of the oil cooler by means of a fastening nut on the coolant tank is possible because the tightening torque of the fastening nut can be supported via the rotationally fixed connection on the soldering surface between the aluminum part of the threaded bush and the heat exchanger. The same applies to the pipe fitting of the oil pipes. In addition, oil leakage is prevented.

In weiterer Ausgestaltung der Erfindung, gemäß Anspruch 3, ist das Aluminiumteil als Befestigungsring ausgebildet, welcher die Gewindebüchse aus Stahl festhält und gleichzeitig eine Verlötung mit dem Wärmeübertrager ermöglicht.In a further embodiment of the invention, according to claim 3, the aluminum part is designed as a fastening ring which holds the threaded bushing made of steel and at the same time allows a soldering with the heat exchanger.

Eine vorteilhafte Weiterbildung der Erfindung ergibt sich aus Anspruch 4, wonach die drehfeste Verbindung zwischen Stahl-Gewindebuchse und Aluminium-Befestigungsring über eine Rändelung bzw. Kerbverzahnung erfolgt. Dabei reicht es aus, wenn eine zahnförmige Rändelung am Umfang des Stahlteiles vorgesehen ist, die sich bei der Montage mit dem Befestigungsring in das weichere Aluminium eingräbt und somit eine Drehmomentabstützung beim Anziehen der Befestigungsmutter ermöglicht. Es ist allerdings auch möglich, daß sowohl an der Außenfläche der Gewindebuchse eine Außenkerbverzahnung als auch an der Innenfläche des Befestigungsringes eine Innenkerbverzahnung vorgesehen sind, die bei Montage beider Teile ineinander greifen.An advantageous development of the invention results from claim 4, according to which the rotationally fixed connection between the steel threaded bushing and the aluminum fastening ring takes place via a knurling or serration. It is sufficient if a tooth-shaped knurling is provided on the circumference of the steel part, which digs into the softer aluminum during assembly with the mounting ring and thus allows a torque support when tightening the mounting nut. However, it is also possible that both on the outer surface of the threaded bushing an external serration and on the inner surface of the fastening ring an internal serration are provided which engage in assembly of both parts.

In Weiterbildung der Erfindung gemäß Anspruch 5 wird über die ringförmige Stufe und einen korrespondierenden Absatz der Vorteil erreicht, daß die Gewindebuchse in axialer Richtung gehalten wird.In a further development of the invention according to claim 5 is achieved via the annular step and a corresponding paragraph the advantage that the threaded bushing is held in the axial direction.

In Weiterbildung der Erfindung, gemäß Anspruch 6, ist eine weitere Kerbverzahnung bzw. Rändelung zwischen dem Aluminium und Stahlteil vorgesehen, womit ein höheres Drehmoment zwischen beiden Teilen bei der Montage und Demontage des Ölkühlers bzw. der Rohrverschraubung übertragbar ist.In a further development of the invention, according to claim 6, a further serration or knurling between the aluminum and steel part is provided, whereby a higher torque between the two parts in the assembly and disassembly of the oil cooler and the pipe fitting is transferable.

In vorteilhafter Ausgestaltung der Erfindung nach Anspruch 7 wird die Lötverbindung zwischen dem Aluminium-Befestigungsring und dem Aluminium-Wärmeübertrager über eine Lotscheibe ermöglicht, das heißt eine beidseitig mit einer Lotlegierung beschichtete Scheibe aus einem Aluminiumwerkstoff bzw. einer Aluminiumlegierung. Es ist allerdings auch möglich, auf diese Lotscheibe zu verzichten, indem beispielsweise die äußerste Fläche des Wärmeübertragers, also dessen Verbindungsfläche mit Befestigungsring, ihrerseits mit einer Lotplattierung versehen ist.In an advantageous embodiment of the invention according to claim 7, the solder joint between the aluminum mounting ring and the aluminum heat exchanger is made possible by a solder disk, that is a coated on both sides with a solder alloy disc of an aluminum material or an aluminum alloy. However, it is also possible to dispense with this solder disk by, for example, the outermost surface of the heat exchanger, so its connection surface with mounting ring, in turn provided with a Lotplattierung.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Ansprüchen 8 bis 12. Zwischen dem Stahlteil und dem Aluminiumteil sind Dichtmittel vorgesehen, die entweder vor dem Lötprozeß oder danach vorgesehen werden. Ein lötbares Dichtmittel, welches also bereits vor dem Lötprozeß angebracht wird, ist eine im Stahlkörper angebrachte umlaufende Schneidrippe, die sich in den weicheren Aluminiumwerkstoff eingräbt und somit bereits eine starke Dichtwirkung erzielt. Als lötbares Dichtmittel kann auch ein hochtemperaturbeständiges Epoxydharz bzw. Keramikkleber im Kontaktbereich des Aluminium- und Stahlteils vorgesehen sein, welches also vor der Montage der Gewindebuchse und des Befestigungsringes im Verbindungsbereich beider Teile aufgetragen wird und dann aufgrund seiner Hochtemperaturbeständigkeit den Lötprozeß schadlos übersteht. Ein solches Epoxydharz kann zusätzlich zu der erwähnten Schneidrippe zur vollständigen Abdichtung vorgesehen sein. Schließlich kann auch ein Dichtmittel nach dem Lötprozeß appliziert werden, welches nicht hochtemperaturbeständig ist und von außen in den Verbindungsbereich vom Stahl- und Aluminiumteil eingebracht wird.Further advantageous embodiments of the invention will become apparent from the claims 8 to 12. Between the steel part and the aluminum part sealing means are provided, either before the soldering process or thereafter be provided. A solderable sealant, which is thus already attached before the soldering process, is a mounted in the steel body circumferential cutting rib, which digs into the softer aluminum material and thus already achieved a strong sealing effect. As a solderable sealant and a high temperature resistant epoxy or ceramic adhesive may be provided in the contact region of the aluminum and steel part, which is thus applied before mounting the threaded bushing and the mounting ring in the connecting region of both parts and then survives the soldering process harmless due to its high temperature resistance. Such an epoxy resin may be provided in addition to the mentioned fin for complete sealing. Finally, a sealant can be applied after the soldering process, which is not resistant to high temperatures and is introduced from the outside into the connection area of the steel and aluminum part.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben. Es zeigen

Fig. 1
einen Flachrohr-Getriebeölkühler in einer Ansicht von vorn,
Fig. 1a
den Getriebeölkühler nach Fig. 1 in einer Ansicht von unten,
Fig. 1b
den Getriebeölkühler nach Fig. 1 in einer Ansicht von der Seite,
Fig. 2
einen Schnitt durch einen Anschlußstutzen des Getriebeölkühlers in vergrößerter Darstellung und
Fig. 3
ein Detail der Gewindebuchse mit Schneidrippe.
An embodiment of the invention is illustrated in the drawing and will be described in more detail below. Show it
Fig. 1
a flat tube transmission oil cooler in a front view,
Fig. 1a
the transmission oil cooler after Fig. 1 in a view from below,
Fig. 1b
the transmission oil cooler after Fig. 1 in a view from the side,
Fig. 2
a section through a connecting piece of the transmission oil cooler in an enlarged view and
Fig. 3
a detail of the threaded bush with cutting rib.

Fig. 1 zeigt einen Getriebeölkühler 1, der aus einem Stapel von einzelnen Flachrohren 2 besteht, welche endseitig durch einen Falz 3 verschlossen sind. Innerhalb der Flachrohre 2 sind Turbulenzbleche 4 angeordnet, die für eine Verwirbelung des Öls und damit für einen verbesserten Wärmeübergang sorgen. Zwischen den einzelnen Flachrohren 2 sind weitere Turbulenzbleche 5 vorgesehen, die eine Verbesserung des Wärmeübergangs auf der Außen-, das heißt der Kühlmittelseite bewirken. Der Ölkühler 1 weist zwei Anschlußstutzen 6 und 7 auf, die für den Einlaß und den Auslaß des Öls, das heißt des zu kühlenden Mediums bestimmt sind. Ferner dienen diese Anschlußstutzen der Befestigung des Ölkühlers im Kühlmittelkasten eines nicht dargestellten Kühlmittelkühlers, wie dies durch den obengenannten Stand der Technik bekannt ist. Die strichpunktierte Linie 8 markiert die Ebene, an welcher der Getriebeölkühler 1 auf der Innenseite des nicht dargestellten Kühlmittelkastens anliegt und befestigt ist. Das Getriebeöl tritt also beispielsweise durch den Eintrittsstutzen 6 in den Ölkühler ein, durchströmt die einzelnen Flachrohre 2 parallel und verläßt den Ölkühler 1 wieder durch den Austrittsstutzen 7. Die Außenseiten der Flachrohre 2 werden vom Kühlmittel beaufschlagt, welches den Kühlmittelkühler durchströmt. Die Teile 2, 3, 4, 5 bestehen aus einer Aluminiumlegierung, die hartlötbar ist. Die Ausbildung der Stutzen 6 und 7 (beide sind gleich) wird im Folgenden anhand der Fig. 2 beschrieben. Fig. 1 shows a transmission oil cooler 1, which consists of a stack of individual flat tubes 2, which are closed at the end by a fold 3. Within the flat tubes 2 turbulence plates 4 are arranged, which provide for a swirling of the oil and thus for improved heat transfer. Between the individual flat tubes 2 further turbulence plates 5 are provided, which cause an improvement of the heat transfer on the outside, that is, the coolant side. The oil cooler 1 has two connecting pieces 6 and 7, which are intended for the inlet and the outlet of the oil, that is, the medium to be cooled. Furthermore, these connection pieces are used to attach the oil cooler in Coolant box of a coolant cooler, not shown, as is known by the above-mentioned prior art. The dot-dash line 8 marks the plane at which the transmission oil cooler 1 rests on the inside of the coolant tank, not shown, and is fixed. The transmission oil thus enters, for example through the inlet nozzle 6 in the oil cooler, flows through the individual flat tubes 2 in parallel and leaves the oil cooler 1 again through the outlet nozzle 7. The outer sides of the flat tubes 2 are acted upon by the coolant flowing through the coolant radiator. The parts 2, 3, 4, 5 are made of an aluminum alloy, which is brazeable. The formation of the nozzles 6 and 7 (both are the same) is described below with reference to Fig. 2 described.

Die Fig. 1a und 1b zeigen den Getriebeölkühler 1 in einer Ansicht von unten bzw. einer Ansicht von der Seite.The Fig. 1a and 1b show the transmission oil cooler 1 in a view from below or a view from the side.

Fig. 2 zeigt einen Längsschnitt durch den Stutzen 6 in vergrößerter Darstellung mit einem Teil des Getriebeölkühlers 1. Der Anschlußstutzen 6 ist zweiteilig aufgebaut, das heißt er besteht einerseits aus einem Gewindestutzen 8, welcher aus Edelstahl hergestellt ist, und aus einem Befestigungsring 9, welcher aus einer lötbaren Aluminiumlegierung hergestellt ist. Beide Teile 8 und 9 sind drehfest und dicht miteinander verbunden, wie im Folgenden noch erläutert wird. Zwischen der Stirnfläche 10 des Anschlußstutzens 6 und der Außenfläche 11 des Ölkühlers 1 ist eine Lotscheibe 12 angeordnet, welche aus einer Aluminiumlegierung als Grundwerkstoff besteht und beidseitig mit einer Lotlegierung plattiert ist. Diese Lotscheibe 12 ist für die Verlötung des Befestigungsringes 9 mit dem Ölkühler 1 vorgesehen. Andere Verlötungsmittel wären auch möglich, z. B. eine Plattierung der Außenfläche 11 des Ölkühlers 1 mit einer Lotlegierung, die dann eine Verlötung mit dem Befestigungsring 9 ermöglicht. Der Einbau des Ölkühlers 1 in einen vollständig nicht dargestellten Kühlmittelkasten eines Kühlmittelkühlers ist teilweise und gestrichelt dargestellt: Der Befestigungsring 9 weist eine Stirnfläche 13 mit einer ringförmigen Nut 14 auf, die der Aufnahme eines O-Ringes 15 dient. Diese Stirnfläche 13 liegt an der Innenseite 16 der Kunststoffwandung 17 (gestrichelt) eines nicht dargestellten Kühlmittelkastens an (die Fläche 16 entspricht der Ebene 8 inFig. 1). Der Anschlußstutzen 6 weist einen Gewindeabschnitt 18 auf, der sich durch eine Öffnung 19 in der Wandung 17 nach außen erstreckt. Über diesen Gewindeabschnitt 18 wird eine Befestigungsmutter 20 geschraubt, welche den Ölkühler 1 an der Wandung 17 befestigt und gleichzeitig über den O-Ring 15 abdichtet. Der über die Befestigungsmutter 20 nach außen vorstehende Teil des Gewindeabschnittes 18 dient der Befestigung einer nicht dargestellten Rohrverschraubung für die Zu- oder Abfuhr des Getriebeöls. Aus dieser Montagebeschreibung wird deutlich, daß beispielsweise beim Anziehen der Befestigungsmutter 20 ein Drehmoment auf den Gewindestutzen 8 ausgeübt wird, welches abgestützt werden muß - dies geschieht über die Verbindung zwischen Gewindestutzen 8 und Befestigungsring 9 durch jeweils einen zylindrischen Sitz 21 und 22. Das härtere der beiden Teile, das heißt der Edelstahlgewindestutzen weist an seiner Umfangsfläche 21' (dies ist als Einzelheit III in Fig. 3 dargestellt) eine zahnförmige Rändelung oder eine Kerbverzahnung 23 auf (Fig. 3); eine ähnliche Rändelung bzw. Kerbverzahnung 24 ist für den zylindrischen Sitz 22 auf der Fläche 22' vorgesehen. Bei der Montage des Befestigungsringes 9 in axialer Richtung gräbt sich die Kerbverzahnung 23 und 24 in die entsprechenden Umfangsflächen des weicheren Werkstoffes Aluminium, d. h. in den Befestigungsring 9, ein - dadurch wird eine drehfeste Verbindung zwischen beiden Teilen hergestellt, die in der Lage ist, die bei der Montage oder Demontage auftretenden Drehmomente über die Lötverbindung auf den Ölkühler 1 zu übertragen. Darüber hinaus müssen die beiden Teile 8 und 9 im Bereich des zylindrischen Sitzes 21 und 22 auch abgedichtet werden. Dies geschieht durch eine in Fig. 3 dargestellte umlaufende Schneidkante 25, die sich über eine Planfläche 26 eines ringförmigen Bundes 27 in axialer Richtung erhebt. Beim Zusammenfügen der Teile 8 und 9 wird diese Schneidkante 25 in die gegenüberliegende Fläche einer ringförmigen Stufe 28 an dem Befestigungsring 9 hineingedrückt. Damit wird eine hinreichende Abdichtung beider Teile 8 und 9 erreicht, bevor der gesamte Anschlußstutzen 6 mit dem Ölkühler 1 verlötet wird. Zusätzlich zu dieser Dichtmaßnahme 25 kann im Bereich des zylindrischen Sitzes 21 und 22 ein hochtemperaturfestes Dichtmittel, z. B. ein Keramikkleber, aufgebracht werden, welches aufgrund seiner Temperaturbeständigkeit durch den anschließenden Lötprozeß keine Beeinträchtigung seiner Dichtfähigkeit erfährt. Anstelle des hochtemperaturbeständigen Dichtmittels kann als Dichtmittel ein Zwei- bzw. Ein-Komponenten-Epoxydharz nach dem Lötprozeß aufgebracht werden, und zwar im Bereich einer muldenförmigen ringförmigen Vertiefung 29, welche sich im Bereich des zylindrischen Sitzes 22 befindet. Ein solches Dichtmittel wird in flüssiger Form aufgebracht, dringt dann in den zylindrischen Sitz 22 ein, härtet anschließend aus und bewirkt somit eine Abdichtung beider Teile 8 und 9. Fig. 2 shows a longitudinal section through the nozzle 6 in an enlarged view with a portion of the transmission oil cooler 1. The connecting piece 6 is constructed in two parts, that is, on the one hand consists of a threaded connector 8, which is made of stainless steel, and a mounting ring 9, which consists of a solderable Aluminum alloy is made. Both parts 8 and 9 are rotatably and tightly connected to each other, as will be explained below. Between the end face 10 of the connecting piece 6 and the outer surface 11 of the oil cooler 1, a solder disk 12 is arranged, which consists of an aluminum alloy as the base material and is plated on both sides with a solder alloy. This solder disk 12 is provided for the soldering of the fastening ring 9 with the oil cooler 1. Other solders would also be possible, for. B. a plating of the outer surface 11 of the oil cooler 1 with a solder alloy, which then allows a soldering with the mounting ring 9. The installation of the oil cooler 1 in a coolant box of a coolant radiator, not shown completely is shown partially and in broken lines: The mounting ring 9 has an end face 13 with an annular groove 14 which serves to receive an O-ring 15. This end face 13 is located on the inside 16 of the plastic wall 17 (dashed lines) of a coolant box, not shown (the surface 16 corresponds to the level 8 in Fig. 1 ). The connection piece 6 has a threaded portion 18 which extends through an opening 19 in the wall 17 to the outside. About this threaded portion 18, a fastening nut 20 is screwed, which fixes the oil cooler 1 on the wall 17 and at the same time seals over the O-ring 15. The over the fastening nut 20 outwardly projecting part of the threaded portion 18 serves to attach a pipe fitting, not shown, for the supply or removal of the transmission oil. From this assembly description it is clear that, for example, when tightening the mounting nut 20, a torque is exerted on the threaded connector 8, which must be supported - this is done via the connection between the threaded connector 8 and mounting ring 9 by a respective cylindrical seat 21 and 22. The harder two parts, that is, the stainless steel threaded connector has on its peripheral surface 21 '(this is as a detail III in Fig. 3 represented) a tooth-shaped knurling or serration 23 ( Fig. 3 ); a similar knurling or serration 24 is provided for the cylindrical seat 22 on the surface 22 '. When mounting the mounting ring 9 in the axial direction digs the serrations 23 and 24 in the corresponding peripheral surfaces of the softer material aluminum, ie in the mounting ring 9, a - thus a non-rotatable connection between the two parts is made, which is able to transmit torque occurring during assembly or disassembly on the oil cooler 1 via the solder joint. In addition, the two parts 8 and 9 in the region of the cylindrical seat 21 and 22 must also be sealed. This is done by a in Fig. 3 illustrated circumferential cutting edge 25 which rises above a plane surface 26 of an annular collar 27 in the axial direction. When joining the parts 8 and 9, this cutting edge 25 is pressed into the opposite surface of an annular step 28 on the mounting ring 9. For a sufficient sealing of both parts 8 and 9 is achieved before the entire connecting piece 6 is soldered to the oil cooler 1. In addition to this sealing measure 25 may in the region of the cylindrical seat 21 and 22, a high temperature resistant sealant, for. As a ceramic adhesive, are applied, which due to its temperature resistance by the subsequent soldering no Impairment of its sealing ability experiences. Instead of the high-temperature-resistant sealant may be applied as a sealant, a two-component or one-component epoxy resin after the soldering process, in the region of a trough-shaped annular recess 29 which is located in the region of the cylindrical seat 22. Such a sealant is applied in liquid form, then penetrates into the cylindrical seat 22, then hardens and thus causes a seal between the two parts 8 and 9.

Wie bereits eingangs erwähnt, läßt sich mit dieser Verbundbauweise eines Anschlußstutzens in Edelstahl und Aluminium ein korrosionsbeständiger Gewindeanschluß für einen Aluminium-Wärmeübertrager herstellen, wobei der komplette Wärmeübertrager, das heißt einschließlich Anschlußstutzen in einem Arbeitsgang gelötet werden kann.As already mentioned, can be produced with this composite construction of a connecting piece in stainless steel and aluminum, a corrosion-resistant threaded connection for an aluminum heat exchanger, the complete heat exchanger, that can be soldered including connecting piece in one operation.

Zwar ist das oben beschriebene Ausführungsbeispiel auf einen durch flüssiges Kühlmittel gekühlten Ölkühler gerichtet, die Erfindung kann jedoch ebenso an einem luftgekühlten Wärmeübertrager verwirklicht werden.While the embodiment described above is directed to an oil cooler cooled by liquid coolant, the invention may be practiced on an air-cooled heat exchanger as well.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
GetriebeölkühlerTransmission oil cooler
22
Flachrohreflat tubes
33
Falzfold
4, 54, 5
Turbulenzblecheturbulence plates
6, 76, 7
Anschlußstutzenconnecting branch
88th
Ebene (Innenseite des Kühlmittelkastens)Level (inside of the coolant box)
99
Befestigungsringfixing ring
1010
Stirnfläche des Anschlußstutzens 6End face of the connection piece 6
1111
Außenfläche des Ölkühlers 1Outer surface of the oil cooler 1
1212
Lotscheibesoldering disk
1313
Stirnfläche von Befestigungsring 9End face of fastening ring 9
1414
Ringförmige NutAnnular groove
1515
O-RingO-ring
1616
Innenseite der Kunststoffwandung 17Inner side of the plastic wall 17
1717
Kunststoffwandungplastic wall
1818
Gewindeabschnittthreaded portion
1919
Öffnung in der Wandung 17Opening in the wall 17
2020
Befestigungsmutterfixing nut
21, 2221, 22
Zylindrischer SitzCylindrical seat
23, 2423, 24
Kerbverzahnungserration
2525
Umlaufende SchneidkanteCircumferential cutting edge
2626
Planflächeplane surface
2727
Ringförmiger BundRing-shaped collar
27'27 '
Absatzparagraph
2828
Ringförmige StufeAnnular step
2929
Ringförmige VertiefungAnnular depression

Claims (12)

  1. Heat exchanger, in particular flat tube oil cooler for motor vehicles, in soldered aluminium construction with a threaded connection for the inlet and outlet of the medium to be cooled, preferably gear oil, characterised in that the connection (6, 7) comprises a stainless steel part (8) with a thread (18) and an aluminium part (9) and is tightly soldered to the heat exchanger (1) via the aluminium part (9).
  2. Heat exchanger according to claim 1, characterised in that the stainless steel part is a threaded bushing (8) non-rotatably and rightly connected to the aluminium part (9).
  3. Heat exchanger according to claim 2, characterised in that the threaded bushing (8) has an annular collar (27) and the aluminium part is designed as a mounting ring (9) connected to the annular collar (27) by a cylindrical seat (21) and soldered to the heat exchanger (1) via its end face (10).
  4. Heat exchanger according to claim 3, characterised in that the cylindrical seat (21) between the annular collar (27) and the mounting ring (9) is designed as a serration or knurling (23).
  5. Heat exchanger according to claim 3 or 4, characterised in that the mounting ring (9) has an annular step (29) engaging a corresponding shoulder (27') of the annular collar (27) of the threaded bushing (8).
  6. Heat exchanger according to claim 5, characterised in that the annular step (29) together with the threaded bushing (8) forms a further cylindrical seat (22) likewise designed as a serration or knurling (24).
  7. Heat exchanger according to any of claims 2 - 6, characterised in that the aluminium part (9) or mounting ring is soldered to the heat exchanger (1) by means of a solder disc (12).
  8. Heat exchanger according to any of claims 2 - 7, characterised in that the mounting ring (9) and the threaded bushing (8) are sealed in their contact region (21, 22) by at least one sealant (25).
  9. Heat exchanger according to claim 8, characterised in that the sealant is solderable.
  10. Heat exchanger according to claim 9, characterised in that the sealant is designed as a continuous die rib (25) on an end face (26) of the threaded bushing (8), which engages an end face of the mounting ring (9).
  11. Heat exchanger according to claim 9, characterised in that the sealant is a high temperature resistant ceramic-based epoxy resin applied in the contact region between the threaded bushing (8) and the mounting ring (9).
  12. Heat exchanger according to claim 8, characterised in that the sealant is a curing epoxy resin applied after the soldering process.
EP01128289A 2001-02-13 2001-11-29 Aluminium heat exchanger Expired - Lifetime EP1231450B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10106510 2001-02-13
DE10106510A DE10106510B4 (en) 2001-02-13 2001-02-13 Aluminum heat exchangers

Publications (3)

Publication Number Publication Date
EP1231450A2 EP1231450A2 (en) 2002-08-14
EP1231450A3 EP1231450A3 (en) 2004-08-11
EP1231450B1 true EP1231450B1 (en) 2009-01-28

Family

ID=7673793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01128289A Expired - Lifetime EP1231450B1 (en) 2001-02-13 2001-11-29 Aluminium heat exchanger

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EP (1) EP1231450B1 (en)
AT (1) ATE422040T1 (en)
DE (2) DE10106510B4 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005012082A1 (en) * 2005-03-16 2006-09-21 Modine Manufacturing Co., Racine Heat exchangers, in particular cooling liquid coolers
WO2010105689A2 (en) * 2009-03-20 2010-09-23 A-Heat Allied Heat Exchange Technology Ag Connecting piece, heat exchanger block and method for producing a heat exchanger block
KR101166534B1 (en) * 2010-02-17 2012-07-19 주식회사 한국쿨러 Manufacturing thereof for oil cooler of automatic transmission
CN103047532A (en) * 2012-12-14 2013-04-17 黄亚光 Oil cooler

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585255A (en) * 1983-08-01 1986-04-29 Universal Enterprises Inc. Heavy duty tube coupling
DE3602891A1 (en) * 1986-01-31 1987-08-06 Sueddeutsche Kuehler Behr HEAT EXCHANGER FOR MOTOR VEHICLES
SE462059B (en) * 1986-12-19 1990-04-30 Blackstone Sweden HEAT EXCHANGE WITH FLAT ROUTES, WHICH ROOTS ARE CREATED BY TWO HALFS WITH OVERLAPPING FLANES
JPH0748002B2 (en) * 1989-09-12 1995-05-24 松下電器産業株式会社 Vaporizer
US5203832A (en) * 1989-11-17 1993-04-20 Long Manufacturing Ltd. Circumferential flow heat exchanger
AT405149B (en) * 1995-02-06 1999-05-25 Vaillant Gmbh METHOD FOR ATTACHING A CORROSION-RESISTANT CONNECTOR
DE19711259A1 (en) * 1997-03-18 1998-10-15 Behr Gmbh & Co Transmission oil cooler
DE19858150C1 (en) * 1998-12-16 2000-06-15 Aluplan Heiztechnik Gmbh & Co Method for longitudinally pressing aluminum radiator parts and connecting pieces for use in the method

Also Published As

Publication number Publication date
DE50114684D1 (en) 2009-03-19
EP1231450A3 (en) 2004-08-11
EP1231450A2 (en) 2002-08-14
ATE422040T1 (en) 2009-02-15
DE10106510A1 (en) 2002-08-29
DE10106510B4 (en) 2009-12-10

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