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EP3953576A1 - Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery - Google Patents

Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery

Info

Publication number
EP3953576A1
EP3953576A1 EP20719367.3A EP20719367A EP3953576A1 EP 3953576 A1 EP3953576 A1 EP 3953576A1 EP 20719367 A EP20719367 A EP 20719367A EP 3953576 A1 EP3953576 A1 EP 3953576A1
Authority
EP
European Patent Office
Prior art keywords
funnel
cooling channel
piston
cooling
shaped tube
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.)
Pending
Application number
EP20719367.3A
Other languages
German (de)
French (fr)
Inventor
Patrick Gerd SCHWARZ
Tobias Ziegler
Axel Hemsing
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP3953576A1 publication Critical patent/EP3953576A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—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

Definitions

  • Cooling channel piston with a funnel-shaped inlet into the cooling channel
  • the invention relates to a cooling channel piston with a cooling channel or a cooling chamber in the area of the piston crown of the cooling channel piston, and to a method for producing such a cooling channel piston, at least one opening being provided in an inner area of the cooling channel piston to the cooling channel or the cooling chamber with a funnel-shaped inlet is, according to the features of the preamble of the respective independent claim.
  • Such a cooling channel piston has in its upper area (piston crown) at least one cooling channel (or at least one cooling chamber), into which a medium is inserted or introduced, circulated and discharged again, around this upper area of the cooling channel piston, which is the combustion chamber the internal combustion engine is facing to cool.
  • the medium is usually oil from the internal combustion engine.
  • a piston base body for example a piston blank, is produced which already has the cooling channel or the cooling space, at least one bore then being made from the interior of the piston base body in the direction of the cooling channel or the cooling space.
  • the cooling channel or the cooling space is accessible to the introduction of the at least one bore.
  • annular cooling channel Devices for realizing an annular cooling channel are known from DE 100 15 709 A1 or DE 102 34 539 A1.
  • the annular cooling channel is manufactured as a separate component before the piston blank that is to be cast is manufactured and is inserted into the casting mold before casting.
  • This separate component has an extremely complex shape, on the one hand there is the risk that when this component is handled when it is inserted into the casting mold, it is damaged or on the other hand it is even forgotten.
  • the invention is therefore based on the object of improving a cooling channel piston of the type described in the introduction to the effect that the disadvantages described are eliminated and an improved cooling channel piston is available.
  • the object is achieved in that a funnel-shaped tube is inserted and fixed into the at least one opening after the cooling channel piston has been produced.
  • the funnel-shaped tube is therefore inserted after the production of the piston base body into the opening which extends from the inner region of the piston base body into the annular cooling channel or cooling space that has already been produced.
  • the funnel-shaped tube can be pressed into the opening. But it can also be fixed in the opening by means of a latching connection. It is also possible to fasten the funnel-shaped tube in the opening by means of a joint connection, for example by means of a welding process.
  • the at least one opening into which the funnel-shaped tube is to be inserted can be introduced during the manufacture of the piston blank or also after its manufacture. This opening can be made, for example, by casting and subsequent rinsing, but just as well by machining such as drilling, milling or the like or by other suitable methods from the interior of the piston blank in the direction of the cooling channel or the cooling chamber.
  • the geometric shape of this opening is, for example, cylindrical. However, it can also have other geometric shapes, such as a conical shape, the diameter of the cone decreasing beginning in the inner region of the piston blank in the direction of the entry of the opening into the cooling channel or the cooling space.
  • the funnel-shaped tube produced and prepared separately for this purpose is inserted into this prepared opening of the piston blank.
  • this tube is fixed in the opening by means of a press fit.
  • fix the pipe in the opening in addition or as an alternative to the press fit by a joining process, such as a welding process.
  • it can also be fixed in the opening by a form fit, such as a latching connection.
  • the axial extension of the funnel-shaped tube Either the length of the tube corresponds to the length of the opening in the piston, so that the respective end of the tube is flush with the inner region of the piston blank or the entry of the opening into the cooling channel or the cooling space.
  • the tube protrudes a little into the cooling channel or the cooling space and / or projects beyond the surface of the inner region of the piston blank. If the tube protrudes a little into the cooling channel, it is advantageously around the entry area of the opening into the A dam is formed in the cooling channel or the cooling chamber, which ensures that at least when the finished and ready-to-use piston in the cylinder chamber of the internal combustion engine is at a standstill, cooling medium, for example oil, collects on the bottom of the cooling channel or the cooling chamber. This effect also contributes to an improvement in the cooling effect of the cooling medium circulating in the cooling channel during the oscillating movement of the ready-to-use cooling duct in the internal combustion engine.
  • cooling medium for example oil
  • the funnel shape of the tube has the advantage that a free jet of the cooling medium, in particular the cooling oil, which flows in the direction of the underside of the inner area of the cooling channel piston is emitted by a spray nozzle during its operation in the internal combustion engine, ideally during the entire up and down movement of the cooling duct piston, but in a wide range of this movement, via the funnel-shaped tube into the cooling duct or the cooling chamber.
  • a free jet of the cooling medium in particular the cooling oil
  • Figures 1 to 6 various views and sections of a funnel-shaped
  • FIGS. 7 to 10 different views and sections of a cooling channel piston with inserted tubes.
  • the funnel-shaped tube produced separately from the piston base body, in particular the piston blank is denoted by 1 and is shown in several views and in two sections.
  • the funnel-shaped tube 1 is produced, for example, from a suitable sheet metal material by a rolling process.
  • the abutting edges identified by 2 and 3 can be arranged overlapping or abutting. In both cases, a joining process for connecting the two abutting edges 2 and 3 can either be omitted or it can be carried out at points, in sections or over the entire length.
  • a joining process for connecting the two abutting edges 2 and 3 can either be omitted or it can be carried out at points, in sections or over the entire length.
  • the abutting edges 2 and 3 overlap, a joining process for connecting the two abutting edges 2 and 3 being omitted.
  • two protruding locking lugs 4 and 5 are provided.
  • the two locking lugs 4 and 5 are diametrically opposite in this embodiment.
  • more than two locking lugs or the like can also be provided over the circumference of the funnel-shaped tube 1 and / or its axial extent.
  • recesses assigned to the latching lugs 4 and 5, which are preferably designed in the form of a ring, can be provided in the opening of the cooling channel piston.
  • the funnel-shaped tube 1 is inserted into the cylindrical or other-shaped, for example conical, opening in the piston blank and fastened there.
  • the funnel-shaped tube 1 can also be fixed by a joining process, for example a point-like or circumferential welding process, by a gluing process or the like.
  • the locking means, in particular the locking lugs 4 and 5, also ensure that the funnel-shaped tube 1 is fixed in the opening in the piston blank in such a way that the funnel-shaped tube 1 can no longer move out of the opening into the interior of the cooling channel piston.
  • the cooling channel piston shown in FIGS. 7 to 10 is denoted by 6.
  • the cooling channel piston 6 has pin bores 7, via which it is connected, not shown, to a connecting rod of the internal combustion engine.
  • the pin bores 7 are arranged in the wall of the inner region 8 of the cooling channel piston 6.
  • two openings 1 1, 12 are provided, in which funnel-shaped tubes 1 are inserted, which are fixed in the openings according to the measures already described above.
  • the tubes are shown as cylindrical. However, they are actually funnel-shaped tubes or corresponding modifications, which can also have a conical or truncated cone shape.

Landscapes

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

Abstract

A gallery-cooled piston (6) with a cooling gallery (9) or a cooling chamber in the region of the piston crown (10) of the gallery-cooled piston (6), wherein at least one opening (11 or 12) which has a funnel-shaped inlet is provided from an inner region (8) of the gallery-cooled piston (6) to the cooling gallery (9) or the cooling chamber, characterized in that a funnel-shaped tube (1) is inserted into and fixed in the at least one opening (11 and/or 12) after the production of the gallery-cooled piston (6).

Description

Kühlkanalkolben mit einem trichterförmigen Zulauf in den Kühlkanal Cooling channel piston with a funnel-shaped inlet into the cooling channel
Beschreibung description
Die Erfindung bezieht sich auf einen Kühlkanalkolben mit einem Kühlkanal oder einem Kühlraum im Bereich des Kolbenbodens des Kühlkanalkolbens, sowie auf ein Verfahren zur Herstellung eines solchen Kühlkanalkolbens, wobei zumindest eine Öffnung in einem Innenbereich des Kühlkanalkolbens zu dem Kühlkanal oder dem Kühlraum mit einem trichterförmigen Zulauf vorgesehen ist, gemäß den Merkmalen des Oberbegriffes des jeweiligen unabhängigen Patentanspruches. The invention relates to a cooling channel piston with a cooling channel or a cooling chamber in the area of the piston crown of the cooling channel piston, and to a method for producing such a cooling channel piston, at least one opening being provided in an inner area of the cooling channel piston to the cooling channel or the cooling chamber with a funnel-shaped inlet is, according to the features of the preamble of the respective independent claim.
Ein solcher Kühlkanalkolben weist in seinem oberen Bereich (Kolbenboden) zumindest einen Kühlkanal (bzw. zumindest einen Kühlraum) auf, in den ein Medium eingefügt ist bzw. eingeführt wird, zirkuliert und wieder abgeführt wird, um diesen oberen Bereich des Kühlkanalkolbens, der dem Verbrennungsraum der Brennkraftmaschine zugewandt ist, zu kühlen. Bei dem Medium handelt es sich im Regelfall um Öl der Brennkraftmaschine. Such a cooling channel piston has in its upper area (piston crown) at least one cooling channel (or at least one cooling chamber), into which a medium is inserted or introduced, circulated and discharged again, around this upper area of the cooling channel piston, which is the combustion chamber the internal combustion engine is facing to cool. The medium is usually oil from the internal combustion engine.
Für den Zulauf und/oder den Ablauf des Kühlmediums ist es erforderlich, eine Öffnung von dem Innenbereich des Kolbens in Richtung des Kühlkanals bzw. des Kühlraumes zu schaffen. Hierzu ist es grundsätzlich bekannt, dass ein Kolbengrundkörper, z.B. ein Kolbenrohling, hergestellt wird, der schon den Kühlkanal bzw. den Kühlraum aufweist, wobei dann von dem Innenbereich des Kolbengrundkörpers in Richtung des Kühlkanals bzw. des Kühlraumes zumindest eine Bohrung eingebracht wird. Nach dem Einbringen der zumindest einen Bohrung ist der Kühlkanal bzw. der Kühlraum zugänglich. For the inlet and / or outlet of the cooling medium, it is necessary to create an opening from the inner region of the piston in the direction of the cooling channel or the cooling space. For this purpose, it is basically known that a piston base body, for example a piston blank, is produced which already has the cooling channel or the cooling space, at least one bore then being made from the interior of the piston base body in the direction of the cooling channel or the cooling space. To The cooling channel or the cooling space is accessible to the introduction of the at least one bore.
Aus der DE 100 15 709 A1 oder der DE 102 34 539 A1 sind Vorrichtungen zur Realisierung eines ringförmigen Kühlkanales bekannt. Bei diesen wird der ringförmige Kühlkanal vor der Herstellung des Kolbenrohlings, der gegossen werden soll, als ein separates Bauteil hergestellt und vor dem Gießen in die Gießform eingesetzt. Dabei hat dieses separate Bauteil eine äußerst komplexe Form, wobei zum Einen die Gefahr besteht, dass bei der Handhabung dieses Bauteiles bei dem Einsetzen in die Gussform dieses beschädigt wird oder zum Anderen sogar vergessen wird. Devices for realizing an annular cooling channel are known from DE 100 15 709 A1 or DE 102 34 539 A1. In these, the annular cooling channel is manufactured as a separate component before the piston blank that is to be cast is manufactured and is inserted into the casting mold before casting. This separate component has an extremely complex shape, on the one hand there is the risk that when this component is handled when it is inserted into the casting mold, it is damaged or on the other hand it is even forgotten.
Der Erfindung liegt daher die Aufgabe zugrunde, einen Kühlkanalkolben der eingangs beschriebenen Gattung dahingehend zu verbessern, dass die beschriebenen Nachteile behoben werden und ein verbesserter Kühlkanalkolben zur Verfügung steht. The invention is therefore based on the object of improving a cooling channel piston of the type described in the introduction to the effect that the disadvantages described are eliminated and an improved cooling channel piston is available.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass ein trichterförmiges Rohr nach der Herstellung des Kühlkanalkolbens in die zumindest eine Öffnung eingesetzt und festgelegt wird. Das trichterförmige Rohr wird daher nach der Herstellung des Kolbengrundkörpers in die Öffnung, die von dem Innenbereich des Kolbengrundkörpers in den schon hergestellten ringförmigen Kühlkanal bzw. Kühlraum reicht, eingesetzt. According to the invention, the object is achieved in that a funnel-shaped tube is inserted and fixed into the at least one opening after the cooling channel piston has been produced. The funnel-shaped tube is therefore inserted after the production of the piston base body into the opening which extends from the inner region of the piston base body into the annular cooling channel or cooling space that has already been produced.
Dabei kann das trichterförmige Rohr in die Öffnung eingepresst werden. Es kann aber auch mittels einer Rastverbindung in der Öffnung festgelegt werden. Es ist weiterhin möglich, das trichterförmige Rohr durch eine Fügeverbindung, z.B. durch einen Schweißvorgang in der Öffnung zu befestigen. Die zumindest eine Öffnung, in die das trichterförmige Rohr eingesetzt werden soll, kann schon mit der Herstellung des Kolbenrohlings oder auch nach seiner Herstellung eingebracht werden. Diese Öffnung kann z.B. durch Gießen und anschließendes Ausspülen, genauso gut aber auch durch eine spanabhebende Herstellung, wie z.B. Bohren, Fräsen oder dergleichen oder durch andere geeignete Verfahren von dem Innenbereich des Kolbenrohlings in Richtung des Kühlkanals bzw. des Kühlraumes eingebracht werden. Die geometrische Form dieser Öffnung ist z.B. zylinderförmig. Sie kann aber auch andere geometrische Formen, wie z.B. eine Konusform aufweisen, wobei sich der Durchmesser des Konus beginnend im Innenbereich des Kolbenrohlings in Richtung des Eintretens der Öffnung in den Kühlkanal bzw. den Kühlraum verkleinert. The funnel-shaped tube can be pressed into the opening. But it can also be fixed in the opening by means of a latching connection. It is also possible to fasten the funnel-shaped tube in the opening by means of a joint connection, for example by means of a welding process. The at least one opening into which the funnel-shaped tube is to be inserted can be introduced during the manufacture of the piston blank or also after its manufacture. This opening can be made, for example, by casting and subsequent rinsing, but just as well by machining such as drilling, milling or the like or by other suitable methods from the interior of the piston blank in the direction of the cooling channel or the cooling chamber. The geometric shape of this opening is, for example, cylindrical. However, it can also have other geometric shapes, such as a conical shape, the diameter of the cone decreasing beginning in the inner region of the piston blank in the direction of the entry of the opening into the cooling channel or the cooling space.
In diese vorbereitete Öffnung des Kolbenrohlings wird das separat dazu hergestellte und vorbereitete trichterförmige Rohr eingesetzt. Zum einen ist es denkbar, dass dieses Rohr durch eine Presspassung in der Öffnung festgelegt wird. Es ist aber auch denkbar, das Rohr zusätzlich oder alternativ zu der Presspassung durch ein Fügeverfahren, wie z.B. einen Schweißvorgang, in der Öffnung festzulegen. Außerdem kann es ebenfalls zusätzlich oder alternativ zu den beiden vorstehend genannten Methoden durch einen Formschluss, wie z.B. eine Rastverbindung in der Öffnung festgelegt werden. Bei der axialen Erstreckung des trichterförmigen Rohres gibt es mehrere Varianten. Entweder entspricht die Länge des Rohres der Länge der Öffnung in dem Kolben, so dass das jeweilige Ende des Rohres mit dem Innenbereich des Kolbenrohlings bzw. dem Eintritt der Öffnung in den Kühlkanal bzw. den Kühlraum abschließt. Alternativ dazu ist es denk-bar, dass das Rohr ein Stück weit in den Kühlkanal bzw. den Kühlraum hineinragt und/oder über die Oberfläche des Innenbereiches des Kolbenrohlings hinaussteht. Ragt das Rohr ein Stück weit in den Kühlkanal hinein, wird in vorteilhafter Weise um den Eintrittsbereich der Öffnung in den Kühlkanal bzw. den Kühlraum ein Damm gebildet, der bewirkt, dass zumindest bei Stillstand des fertig bearbeiteten und einsatzbereiten Kolbens in dem Zylinderraum der Brennkraftmaschine sich Kühlmedium, z.B. Öl, auf dem Boden des Kühlkanals bzw. des Kühlraumes sammelt. Dieser Effekt trägt auch bei der oszillierenden Bewegung des einsatzbereiten Kühlkanales in der Brennkraftmaschine zu einer Verbesserung der Kühlwirkung des in dem Kühlkanal zirkulierenden Kühlmediums bei. The funnel-shaped tube produced and prepared separately for this purpose is inserted into this prepared opening of the piston blank. On the one hand, it is conceivable that this tube is fixed in the opening by means of a press fit. However, it is also conceivable to fix the pipe in the opening in addition or as an alternative to the press fit by a joining process, such as a welding process. In addition or as an alternative to the two methods mentioned above, it can also be fixed in the opening by a form fit, such as a latching connection. There are several variants of the axial extension of the funnel-shaped tube. Either the length of the tube corresponds to the length of the opening in the piston, so that the respective end of the tube is flush with the inner region of the piston blank or the entry of the opening into the cooling channel or the cooling space. As an alternative to this, it is conceivable that the tube protrudes a little into the cooling channel or the cooling space and / or projects beyond the surface of the inner region of the piston blank. If the tube protrudes a little into the cooling channel, it is advantageously around the entry area of the opening into the A dam is formed in the cooling channel or the cooling chamber, which ensures that at least when the finished and ready-to-use piston in the cylinder chamber of the internal combustion engine is at a standstill, cooling medium, for example oil, collects on the bottom of the cooling channel or the cooling chamber. This effect also contributes to an improvement in the cooling effect of the cooling medium circulating in the cooling channel during the oscillating movement of the ready-to-use cooling duct in the internal combustion engine.
Die Trichterform des Rohres, dessen Durchmesser im Innenbereich des Kühlkanalkolbens größer ist als im Austrittsbereich, der in den Kühlkanal bzw. Kühlraum weist, hat den Vorteil, dass ein freier Strahl des Kühlmediums, insbesondere des Kühlöls, der in Richtung der Unterseite des Innenbereiches des Kühlkanalkolbens bei seinem Betrieb in der Brennkraftmaschine von einer Spritzdüse abgegeben wird, im Idealfall während der gesamten Auf- und Abwärtsbewegung des Kühlkanalkolbens, jedoch in einem weiten Bereich dieser Bewegung, über das trichterförmige Rohr in den Kühlkanal bzw. den Kühlraum eingeleitet wird. Außerdem lassen sich Bauteiltoleranzen und Toleranzen bei der Montage, der die Kühlung des Kühlkanales beteiligten Elemente, z.B. die Anordnung der Einspritzdüse, Ausrichtung des Kühlkanalkolbens in den Zylindern der Brennkraftmaschine usw., ausgleichen. The funnel shape of the tube, the diameter of which in the inner area of the cooling channel piston is larger than in the outlet area, which points into the cooling channel or cooling space, has the advantage that a free jet of the cooling medium, in particular the cooling oil, which flows in the direction of the underside of the inner area of the cooling channel piston is emitted by a spray nozzle during its operation in the internal combustion engine, ideally during the entire up and down movement of the cooling duct piston, but in a wide range of this movement, via the funnel-shaped tube into the cooling duct or the cooling chamber. In addition, component tolerances and tolerances during assembly, the elements involved in cooling the cooling duct, e.g. the arrangement of the injection nozzle, alignment of the cooling duct piston in the cylinders of the internal combustion engine, etc., compensate.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen verein-facht dargestellt. Es zeigen: Embodiments of the invention are shown in simplified form in the drawings. Show it:
Figurenl bis 6: verschiedenartige Ansichten und Schnitte eines trichterförmigen Figures 1 to 6: various views and sections of a funnel-shaped
Rohres und Rohres and
Figuren 7 bis 10: verschiedene Ansichten und Schnitte eines Kühlkanalkolbens mit eingesetzten Rohren. In den Figuren 1 bis 6 ist das separat von dem Kolbengrundkörper, insbesondere dem Kolbenrohling, hergestellte trichterförmige Rohr mit 1 bezeichnet und in mehreren Ansichten und in zwei Schnitten dargestellt. Das trichterförmige Rohr 1 wird beispielsweise aus einem geeigneten Blechmaterial durch einen Rollvorgang hergestellt. Die mit 2 und 3 bezeichneten Stoßkanten können dabei überlappend oder auf Stoß angeordnet werden. In beiden Fällen kann entweder ein Fügevorgang zur Verbindung der beiden Stoßkanten 2 und 3 unterbleiben oder punktweise, abschnittsweise oder über die gesamte Länge erfolgen. In dem Ausführungsbeispiel gemäß den Figuren 1 bis 6 überlappen sich die Stoßkanten 2 und 3, wobei ein Fügevorgang zur Verbindung der beiden Stoßkanten 2 und 3 unterblieben ist. Etwa auf der Mitte der Längserstreckung des trichterförmigen Rohres 1 sind zwei abstehende Rastnasen 4 und 5 vorgesehen. Die beiden Rastnasen 4 und 5 liegen bei diesem Ausführungsbeispiel diametral gegenüber. Es können natürlich auch mehr als zwei Rastnasen oder dergleichen über den Umfang des trichterförmigen Rohres 1 und/oder seiner Axialerstreckung vorgesehen werden. In der Öffnung des Kühlkanalkolbens können den Rastnasen 4 und 5 zugeordnete Ausnehmungen, die vorzugsweise ringförmig ausgeführt sind, vorgesehen werden. Mittels dieser Rastmittel, insbesondere Rastnasen 4, 5 oder dergleichen, wird das trichterförmige Rohr 1 in die zylinderförmige oder andersförmige, z.B. konusförmige Öffnung in den Kolbenrohling eingesetzt und dort befestigt. Das trichterförmige Rohr 1 kann auch durch einen Fügevorgang, z.B. einen punktförmigen oder umlaufenden Schweißvorgang, durch einen Klebevorgang oder dergleichen festgelegt werden. Die Rastmittel, insbesondere die Rastnasen 4 und 5 bewirken außerdem, dass das trichterförmige Rohr 1 in der Öffnung in dem Kolbenrohling so festgelegt ist, dass sich das trichterförmige Rohr 1 nicht mehr aus der Öffnung in den Innenbereich des Kühlkanalkolbens hinein bewegen kann. Der in den Figuren 7 bis 10 dargestellte Kühlkanalkolben ist mit 6 be-zeichnet. Der Kühlkanalkolben 6 weist Bolzenbohrungen 7 auf, über die er, nicht dargestellt, mit einem Pleuel der Brennkraftmaschine in Verbindung steht. Die Bolzenbohrungen 7 sind in der Wand des Innenbereichs 8 des Kühlkanalkolbens 6 angeordnet. An den Innenbereich 8 schließt sich ein Kühlkanal 9 an, der bis zum Kolbenboden 10 reicht. Zwischen dem Kühlkanal 9 und dem Innenbereich 8 des Kühlkanalkolbens 6 sind zwei Öffnungen 1 1 ,12 vorgesehen, in denen trichterförmige Rohre 1 eingesetzt sind, die gemäß den zuvor bereits beschriebenen Maßnahmen in den Öffnungen festgelegt sind. Figures 7 to 10: different views and sections of a cooling channel piston with inserted tubes. In FIGS. 1 to 6, the funnel-shaped tube produced separately from the piston base body, in particular the piston blank, is denoted by 1 and is shown in several views and in two sections. The funnel-shaped tube 1 is produced, for example, from a suitable sheet metal material by a rolling process. The abutting edges identified by 2 and 3 can be arranged overlapping or abutting. In both cases, a joining process for connecting the two abutting edges 2 and 3 can either be omitted or it can be carried out at points, in sections or over the entire length. In the exemplary embodiment according to FIGS. 1 to 6, the abutting edges 2 and 3 overlap, a joining process for connecting the two abutting edges 2 and 3 being omitted. Approximately in the middle of the longitudinal extent of the funnel-shaped tube 1, two protruding locking lugs 4 and 5 are provided. The two locking lugs 4 and 5 are diametrically opposite in this embodiment. Of course, more than two locking lugs or the like can also be provided over the circumference of the funnel-shaped tube 1 and / or its axial extent. In the opening of the cooling channel piston, recesses assigned to the latching lugs 4 and 5, which are preferably designed in the form of a ring, can be provided. By means of these locking means, in particular locking lugs 4, 5 or the like, the funnel-shaped tube 1 is inserted into the cylindrical or other-shaped, for example conical, opening in the piston blank and fastened there. The funnel-shaped tube 1 can also be fixed by a joining process, for example a point-like or circumferential welding process, by a gluing process or the like. The locking means, in particular the locking lugs 4 and 5, also ensure that the funnel-shaped tube 1 is fixed in the opening in the piston blank in such a way that the funnel-shaped tube 1 can no longer move out of the opening into the interior of the cooling channel piston. The cooling channel piston shown in FIGS. 7 to 10 is denoted by 6. The cooling channel piston 6 has pin bores 7, via which it is connected, not shown, to a connecting rod of the internal combustion engine. The pin bores 7 are arranged in the wall of the inner region 8 of the cooling channel piston 6. A cooling channel 9, which extends as far as the piston head 10, connects to the inner area 8. Between the cooling channel 9 and the inner region 8 of the cooling channel piston 6, two openings 1 1, 12 are provided, in which funnel-shaped tubes 1 are inserted, which are fixed in the openings according to the measures already described above.
In den Figuren 8 und 10 sind die Rohre zylindrisch dargestellt. Es handelt sich tatsächlich aber um trichterförmige Rohre oder entsprechende Abwandlungen, die auch eine Konus- oder Kegelstumpfform aufweisen können. In FIGS. 8 and 10, the tubes are shown as cylindrical. However, they are actually funnel-shaped tubes or corresponding modifications, which can also have a conical or truncated cone shape.
Bezugszeichenliste List of reference symbols
1 trichterförmiges Rohr1 funnel-shaped tube
2, 3 Stoßkanten 2, 3 edges
4, 5 Rastnasen 4, 5 locking lugs
6 Kühlkanalkolben 6 cooling duct pistons
7 Bolzenbohrung7 bolt hole
8 Innenbereich 8 indoors
9 Kühlkanal 9 cooling duct
10 Kolbenboden 10 piston crown
11 , 12 Öffnungen 11, 12 openings

Claims

Patentansprüche Claims
1. Kühlkanalkolben (6) mit einem Kühlkanal (9) oder einem Kühlraum im Bereich des Kolbenbodens (10) des Kühlkanalkolbens (6), wobei zumindest eine Öffnung (1 1 oder 12) von einem Innenbereich (8) des Kühlkanalkolbens (6) zu dem Kühlkanal (9) oder dem Kühlraum mit einem trichterförmigen Zulauf vorgesehen ist, dadurch gekennzeichnet, dass ein trichterförmiges Rohr (1 ) nach der Herstellung des Kühlkanalkolbens (6) in die zumindest eine Öffnung (1 1 und/oder 12) eingesetzt und festgelegt ist. 1. Cooling channel piston (6) with a cooling channel (9) or a cooling chamber in the area of the piston head (10) of the cooling channel piston (6), at least one opening (1 1 or 12) from an inner area (8) of the cooling channel piston (6) to the cooling channel (9) or the cooling chamber is provided with a funnel-shaped inlet, characterized in that a funnel-shaped tube (1) is inserted and fixed into the at least one opening (11 and / or 12) after the cooling channel piston (6) has been produced .
2. Kühlkanalkolben (6) nach Anspruch 1 , dadurch gekennzeichnet, dass das trichterförmige Rohr (1 ) in die Öffnung (1 1 und/oder 12) eingepresst ist. 2. cooling channel piston (6) according to claim 1, characterized in that the funnel-shaped tube (1) is pressed into the opening (1 1 and / or 12).
3. Kühlkanalkolben (6) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das trichterförmige Rohr (1 ) mittels einer Rastverbindung in der Öffnung (1 1 und/oder 12) festgelegt ist. 3. cooling channel piston (6) according to one of claims 1 or 2, characterized in that the funnel-shaped tube (1) is fixed by means of a latching connection in the opening (1 1 and / or 12).
4. Kühlkanalkolben (6) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das trichterförmige Rohr (1 ) durch eine Fügeverbindung, insbesondere durch einen Schweißvorgang, in der Öffnung (1 1 und/oder 12) befestigt ist. 4. cooling channel piston (6) according to any one of claims 1 to 3, characterized in that the funnel-shaped tube (1) is attached by a joint connection, in particular by a welding process, in the opening (1 1 and / or 12).
5. Kühlkanalkolben (6) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das trichterförmige Rohr (1 ) über den Eintrittsbereich der Öffnung (1 1 und/oder 12) in den Kühlkanal (9) hineinragt. 5. cooling channel piston (6) according to any one of the preceding claims, characterized in that the funnel-shaped tube (1) protrudes over the inlet region of the opening (1 1 and / or 12) into the cooling channel (9).
6. Verfahren zur Herstellung eines trichterförmigen Rohres (1 ) zur Verwendung in einem Kühlkanalkolben (6) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das trichterförmige Rohr (1 ) aus einem geeigneten, zugeschnittenen oder gestanzten Blechmaterial durch einen Rollvorgang hergestellt ist. 6. A method for producing a funnel-shaped tube (1) for use in a cooling duct piston (6) according to one of the preceding claims, characterized in that the funnel-shaped tube (1) is made from a suitable, cut or stamped sheet metal material by rolling.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Stoßkanten (2 und 3) des trichterförmigen Rohres (1 ) nach dem Rollvorgang durch einen Fügevorgang punktweise oder abschnittsweise oder über ihre gesamte Länge aneinander befestigt werden. 7. The method according to claim 6, characterized in that the abutting edges (2 and 3) of the funnel-shaped tube (1) are fastened to one another in points or sections or over their entire length after the rolling process by a joining process.
8. Kühlkanalkolben (6) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stoßkanten (2, 3) des trichterförmigen Rohres (1 ) nach dem Rollvorgang überlappend angeordnet sind. 8. cooling channel piston (6) according to any one of the preceding claims, characterized in that the abutting edges (2, 3) of the funnel-shaped tube (1) are arranged to overlap after the rolling process.
9. Kühlkanalkolben (6) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Wand des trichterförmigen Rohres (1 ) Rastnasen (4, 5) angeformt sind. 9. cooling channel piston (6) according to any one of the preceding claims, characterized in that in the wall of the funnel-shaped tube (1) locking lugs (4, 5) are integrally formed.
EP20719367.3A 2019-04-09 2020-04-08 Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery Pending EP3953576A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019109277 2019-04-09
PCT/EP2020/059975 WO2020208058A1 (en) 2019-04-09 2020-04-08 Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery

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EP3953576A1 true EP3953576A1 (en) 2022-02-16

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EP20719367.3A Pending EP3953576A1 (en) 2019-04-09 2020-04-08 Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery

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US (1) US20220205408A1 (en)
EP (1) EP3953576A1 (en)
CN (1) CN113748263A (en)
DE (1) DE102020109811A1 (en)
WO (1) WO2020208058A1 (en)

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DE102020109811A1 (en) 2020-10-15
US20220205408A1 (en) 2022-06-30
WO2020208058A1 (en) 2020-10-15
CN113748263A (en) 2021-12-03

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