EP3036419B1 - Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine - Google Patents

Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine Download PDF

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Publication number
EP3036419B1
EP3036419B1 EP14777501.9A EP14777501A EP3036419B1 EP 3036419 B1 EP3036419 B1 EP 3036419B1 EP 14777501 A EP14777501 A EP 14777501A EP 3036419 B1 EP3036419 B1 EP 3036419B1
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EP
European Patent Office
Prior art keywords
piston
jet
cooling channel
cooling oil
cooling
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Not-in-force
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EP14777501.9A
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German (de)
French (fr)
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EP3036419A1 (en
Inventor
Rainer Scharp
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Mahle International GmbH
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Mahle International GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/10—Cooling by flow of coolant through pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

  • the present invention relates to an assembly of a piston and a Anspritzdüse for cooling oil for an internal combustion engine, wherein the piston has a piston head and a piston skirt, wherein the piston head has a piston bottom with a bottom, a circumferential ring portion and in the region of the ring part a circumferential cooling channel with at least a feed opening for cooling oil, wherein the injection nozzle is provided below the piston skirt,
  • the cooling of the piston takes place by the injection with cooling oil from the piston shaft end in the direction of the at least one feed opening for cooling oil in the cooling channel.
  • the cooling oil penetrates into the cooling channel and causes there in a conventional manner a cooling of the piston, in particular in the region of the piston head.
  • a piston is known with such a cooling channel in which oil is injected with a nozzle. Further, a beam splitter is provided, which divides the oil from the nozzle, so that a part of the oil can enter into the cooling channel and another part of the oil is directed to the upper connecting rod bearing.
  • the object of the present invention is to further develop a generic piston so that a technically simple and reliable An moussekühlung is achieved.
  • the solution is that the piston on the underside of the piston head adjacent to the at least one feed opening for cooling oil has a beam splitter for cooling oil and that the injection nozzle is arranged below the beam splitter and aligned with the beam splitter.
  • the inventively provided beam splitter causes at least temporarily a portion of the output from the only provided Anspritzdüse cooling oil jet is directed in the direction of the underside of the piston head, while the remaining part enters the cooling channel.
  • the beam splitter causes during the entire stroke movement in engine operation, a division of the cooling oil jet in a directed towards the cooling channel and a directed to the underside of the piston crown partial beam.
  • the central axis of the injection nozzle encloses an acute angle with the central axis of the piston. This oblique position of the injection nozzle causes, during engine operation, when the piston is at the top or bottom dead center, the entire cooling oil jet is conducted into the cooling channel, while the pitch of the cooling oil jet is approximately in the middle Range of the hub is done.
  • the inventively provided beam splitter thus crosses exactly during each up and down stroke the cooling oil jet and causes the division of the cooling oil jet in each one directed towards the cooling channel and directed to the underside of the piston crown sub-beam.
  • the beam splitter has a substantially V-shaped cross-section with the formation of an edge which, starting from the central axis, is arranged outwards in the direction of the cooling channel.
  • the inventively provided beam splitter may be integrally formed with the piston head or as a separate, fixedly connected to the piston head component.
  • the beam splitter has a first guide surface and a second guide surface, wherein the first guide surface is assigned to the cooling channel and the second guide surface is assigned to the underside of the piston head. It is particularly advantageous here when the first guide surface steadily merges into an inner wall of the cooling channel and / or the second guide surface continuously into the underside of the piston head. In this way, a particularly reliable cooling of the underside of the piston crown is achieved.
  • the assembly according to the invention can be realized with all piston types, in particular with one-piece piston, piston of two or more interconnected components, box piston, piston with closed cooling channel and piston with downwardly open, closed with a closure element cooling channel, in particular piston with thermally decoupled piston shaft.
  • FIGS. 1 and 2 show an embodiment of a piston 10 for a structural unit 100 according to the invention.
  • the piston 10 may be a one-piece cast or forged piston or a multi-piece joined piston.
  • the piston 10 may be made of an iron-based material and / or a light metal material.
  • FIGS. 1 and 2 show by way of example a one-piece box piston 10 with downwardly open and closed with a separate closure element 18 cooling channel 17 and with a thermally decoupled piston shaft 21st
  • the piston 10 has a piston head 11 with a combustion bowl 14 having a piston head 13, a peripheral land 15 and a peripheral ring portion 16 with annular grooves for receiving piston rings (not shown).
  • a circumferential cooling channel 17 is provided, which is formed open at the bottom and closed with a separate closure element 18, which has at least one feed opening 19 for cooling oil.
  • the piston 10 also has a thermally decoupled piston shaft 21 with piston hubs 22 and hub bores 23 for receiving a piston pin (not shown).
  • the piston bosses 22 are connected in a manner known per se via hub connections to the piston head 11.
  • the piston hubs 22 are connected to each other via running surfaces 24a, 24b.
  • the piston head 13 has in the interior of the piston 10 on an underside 13 a, which is provided according to the invention with a beam splitter 25.
  • the beam splitter 25 is arranged in the vicinity of the at least one feed opening 19 for cooling oil and, in the exemplary embodiment, has a substantially V-shaped cross section.
  • the edge 25a of the beam splitter 25 is aligned, starting from the central axis M of the piston 10, outward in the direction of the cooling channel 17.
  • the beam splitter 25 is formed integrally with the underside 13a of the piston crown 13 and has a first guide surface 26 and a second guide surface 27 for cooling oil.
  • the first guide surface 26 merges substantially continuously into an inner wall 17a of the cooling channel 17.
  • the second guide surface 27 is in the embodiment substantially continuously in the bottom 13 a of the piston head 13 via.
  • FIGS. 3a to 3c and 4 show an assembly 100 according to the invention in different stages of engine operation with a piston 10 according to the FIGS. 1 and 2 and a Anspritzdüse 30 for cooling oil from which a cooling oil jet 31 exits.
  • the FIG. 3b represents the situation in a middle stroke position between the top dead center and the bottom dead center.
  • the injection nozzle 30 is fixedly arranged in the crankcase, which is aligned with the beam splitter 25.
  • the central axis A of the injection nozzle 30 is arranged so that it forms an acute angle ⁇ with the central axis M of the piston 10. This has the consequence that the piston 10 during a complete stroke from top dead center to bottom dead center and vice versa in each case once crosses the cooling oil jet 31.
  • the cooling oil jet 31 In each case at the top and bottom dead center of the cooling oil jet 31 enters directly into the cooling channel 17, wherein it is guided past the beam splitter 25.
  • the cooling oil jet 31 In the respective middle stroke position between the upper and the lower dead center, the cooling oil jet 31 impinges on the beam splitter 25 with the result that, as in FIG FIG.
  • the injection nozzle 30 could also be arranged so that its central axis A is aligned parallel to the central axis M of the piston 10, as in FIG. 4 is indicated.
  • the cooling oil jet 31 is divided in each phase of the lifting movement of the piston 10 into two partial beams 31a, 31b, which are respectively directed to the underside 13a of the piston head 13 and into the cooling channel 17.

Description

Die vorliegende Erfindung betrifft eine Baueinheit aus einem Kolben und einer Anspritzdüse für Kühlöl für einen Verbrennungsmotor, wobei der Kolben einen Kolbenkopf und einen Kolbenschaft aufweist, wobei der Kolbenkopf einen Kolbenboden mit einer Unterseite, eine umlaufende Ringpartie sowie im Bereich der Ringpartie einen umlaufenden Kühlkanal mit mindestens einer Zuführöffnung für Kühlöl aufweist, wobei die Anspritzdüse unterhalb des Kolbenschafts vorgesehen ist,The present invention relates to an assembly of a piston and a Anspritzdüse for cooling oil for an internal combustion engine, wherein the piston has a piston head and a piston skirt, wherein the piston head has a piston bottom with a bottom, a circumferential ring portion and in the region of the ring part a circumferential cooling channel with at least a feed opening for cooling oil, wherein the injection nozzle is provided below the piston skirt,

Bei der gattungsgemäßen Baueinheit handelt es sich um einen Kolben mit Anspritzkühlung, d.h. die Kühlung des Kolbens erfolgt durch das Anspritzen mit Kühlöl vom kolbenschaftseitigen Ende her in Richtung der mindestens einen Zuführöffnung für Kühlöl im Kühlkanal. Das Kühlöl dringt in den Kühlkanal ein und bewirkt dort in an sich bekannter Weise eine Kühlung des Kolbens insbesondere im Bereich des Kolbenkopfes.In the generic unit is a piston with Anspritzkühlung, i. the cooling of the piston takes place by the injection with cooling oil from the piston shaft end in the direction of the at least one feed opening for cooling oil in the cooling channel. The cooling oil penetrates into the cooling channel and causes there in a conventional manner a cooling of the piston, in particular in the region of the piston head.

Aufgrund der hohen thermischen Belastung moderner Kolben ist es wünschenswert, auch die Unterseite des Kolbenbodens, den so genannten "Dom" zu kühlen. Hierzu schlägt die DE 10 2006 056 011 A1 vor, zwei Anspritzdüsen für Kühlöl vorzusehen, von denen die eine der Versorgung des Kühlkanals mit Kühlöl und die andere zur Kühlung der Unterseite des Kolbenbodens dient.Due to the high thermal load of modern pistons, it is desirable to cool the underside of the piston crown, the so-called "Dom". For this the beats DE 10 2006 056 011 A1 to provide two Anspritzdüsen for cooling oil, one of which serves to supply the cooling channel with cooling oil and the other for cooling the underside of the piston crown.

Aus der US 2003/0221639 A1 ist ein Kolben mit einem solchen Kühlkanal bekannt, in welchen mit einer Düse Öl eingespritzt wird. Ferner ist ein Strahlteiler vorgesehen, der das Öl aus der Düse aufteilt, sodass ein Teil des Öls in den Kühlkanal eintreten kann und ein anderer Teil des Öls zu dem oberen Pleuellager gelenkt wird.From the US 2003/0221639 A1 a piston is known with such a cooling channel in which oil is injected with a nozzle. Further, a beam splitter is provided, which divides the oil from the nozzle, so that a part of the oil can enter into the cooling channel and another part of the oil is directed to the upper connecting rod bearing.

Die Aufgabe der vorliegenden Erfindung besteht darin, einen gattungsgemäßen Kolben so weiterzuentwickeln, dass eine technisch einfache und zuverlässige Anspritzkühlung erzielt wird.The object of the present invention is to further develop a generic piston so that a technically simple and reliable Anspritzkühlung is achieved.

Die Lösung besteht darin, dass der Kolben an der Unterseite des Kolbenbodens benachbart zur mindestens einen Zuführöffnung für Kühlöl einen Strahlteiler für Kühlöl aufweist und dass die Anspritzdüse unterhalb des Strahlteilers angeordnet und auf den Strahlteiler ausgerichtet ist.
Der erfindungsgemäß vorgesehene Strahlteiler bewirkt, dass zumindest zeitweise ein Teil des von der einzigen vorgesehenen Anspritzdüse abgegebenen Kühlölstrahls gezielt in Richtung der Unterseite des Kolbenbodens gelenkt wird, während der verbleibende Teil in den Kühlkanal eintritt. Die erfindungsgemäße Baueinheit stellt somit eine technisch einfache Lösung für eine zuverlässige Anspritzkühlung dar. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.
Wenn die Mittelachse der Anspritzdüse parallel zur Mittelachse des Kolbens ausgerichtet ist, bewirkt der Strahlteiler während der gesamten Hubbewegung im Motorbetrieb eine Aufteilung des Kühlölstrahls in einen zum Kühlkanal hin gerichteten und einen zur Unterseite des Kolbenbodens gelenkten Teilstrahl. Erfindungsgemäß schließt die Mittelachse der Anspritzdüse mit der Mittelachse des Kolbens einen spitzen Winkel ein. Diese Schrägstellung der Anspritzdüse bewirkt, dass im Motorbetrieb dann, wenn sich der Kolben am oberen oder unteren Totpunkt befindet, der gesamte Kühlölstrahl in den Kühlkanal geleitet wird, während die Teilung des Kühlölstrahls in etwa im mittleren
Bereich des Hubs erfolgt. Der erfindungsgemäß vorgesehene Strahlteiler kreuzt also während jedes Aufwärts- und Abwärtshub genau einmal den Kühlölstrahl und bewirkt die Teilung des Kühlölstrahl in je einen zum Kühlkanal hin gerichteten und einen zur Unterseite des Kolbenbodens gelenkten Teilstrahl.
Erfindungsgemäß weist der Strahlteiler einen im Wesentlichen V-förmigen Querschnitt unter Ausbildung einer Kante aufweist, welche ausgehend von der Mittelachse nach außen in Richtung des Kühlkanals angeordnet ist.The solution is that the piston on the underside of the piston head adjacent to the at least one feed opening for cooling oil has a beam splitter for cooling oil and that the injection nozzle is arranged below the beam splitter and aligned with the beam splitter.
The inventively provided beam splitter causes at least temporarily a portion of the output from the only provided Anspritzdüse cooling oil jet is directed in the direction of the underside of the piston head, while the remaining part enters the cooling channel. The assembly according to the invention thus represents a technically simple solution for reliable Anspritzkühlung. Advantageous developments emerge from the dependent claims.
If the center axis of the injection nozzle is aligned parallel to the central axis of the piston, the beam splitter causes during the entire stroke movement in engine operation, a division of the cooling oil jet in a directed towards the cooling channel and a directed to the underside of the piston crown partial beam. According to the invention, the central axis of the injection nozzle encloses an acute angle with the central axis of the piston. This oblique position of the injection nozzle causes, during engine operation, when the piston is at the top or bottom dead center, the entire cooling oil jet is conducted into the cooling channel, while the pitch of the cooling oil jet is approximately in the middle
Range of the hub is done. The inventively provided beam splitter thus crosses exactly during each up and down stroke the cooling oil jet and causes the division of the cooling oil jet in each one directed towards the cooling channel and directed to the underside of the piston crown sub-beam.
According to the invention, the beam splitter has a substantially V-shaped cross-section with the formation of an edge which, starting from the central axis, is arranged outwards in the direction of the cooling channel.

Der erfindungsgemäß vorgesehene Strahlteiler kann mit dem Kolbenkopf einstückig oder als separates, fest mit dem Kolbenkopf verbundenes Bauteil ausgebildet sein.The inventively provided beam splitter may be integrally formed with the piston head or as a separate, fixedly connected to the piston head component.

Besonders bevorzugt weist der Strahlteiler eine erste Leitfläche und eine zweite Leitfläche auf, wobei die erste Leitfläche dem Kühlkanal und die zweite Leitfläche der Unterseite des Kolbenbodens zugeordnet ist. Hierbei ist es von besonderem Vorteil, wenn die erste Leitfläche stetig in eine Innenwand des Kühlkanals und/oder die zweite Leitfläche stetig in die Unterseite des Kolbenbodens übergeht. Auf diese Weise wird eine besonders zuverlässige Kühlung der Unterseite des Kolbenbodens erzielt.Particularly preferably, the beam splitter has a first guide surface and a second guide surface, wherein the first guide surface is assigned to the cooling channel and the second guide surface is assigned to the underside of the piston head. It is particularly advantageous here when the first guide surface steadily merges into an inner wall of the cooling channel and / or the second guide surface continuously into the underside of the piston head. In this way, a particularly reliable cooling of the underside of the piston crown is achieved.

Die erfindungsgemäße Baueinheit kann mit allen Kolbentypen verwirklicht werden, insbesondere mit einteiligen Kolben, Kolben aus zwei oder mehr miteinander verbundenen Bauteilen, Kastenkolben, Kolben mit geschlossenem Kühlkanal sowie Kolben mit nach unten offenem, mit einem Verschlusselement verschlossenem Kühlkanal, insbesondere Kolben mit thermisch entkoppeltem Kolbenschaft.The assembly according to the invention can be realized with all piston types, in particular with one-piece piston, piston of two or more interconnected components, box piston, piston with closed cooling channel and piston with downwardly open, closed with a closure element cooling channel, in particular piston with thermally decoupled piston shaft.

Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Es zeigen in einer schematischen, nicht maßstabsgetreuen Darstellung:

Figur 1
ein Ausführungsbeispiel eines Kolbens für eine erfindungsgemäße Baueinheit im Schnitt;
Figur 2
eine Darstellung der Unterseite des Kolbens in Richtung des Pfeiles P gemäß Figur 1;
Figuren 3a bis 3c
ein Ausführungsbeispiel einer erfindungsgemäßen Baueinheit mit ei-nem Kolben gemäß Figur 1 während eines Kolbenhubs im Motorbetrieb;
Figur 4
den Kolben gemäß Figur 1 während einer Hubbewegung gemäß Figur 3b.
An embodiment of the present invention will be explained in more detail below with reference to the accompanying drawings. In a schematic, not to scale representation:
FIG. 1
an embodiment of a piston for a structural unit according to the invention in section;
FIG. 2
a representation of the underside of the piston in the direction of arrow P according to FIG. 1 ;
FIGS. 3a to 3c
An embodiment of an assembly according to the invention with egg nem piston according to FIG. 1 during a piston stroke during engine operation;
FIG. 4
according to the piston FIG. 1 during a lifting movement according to FIG. 3b ,

Die Figuren 1 und 2 zeigen ein Ausführungsbeispiel eines Kolbens 10 für eine erfindungsgemäße Baueinheit 100. Der Kolben 10 kann ein einteiliger gegossener oder geschmiedeter Kolben oder ein mehrteiliger gefügter Kolben sein. Der Kolben 10 kann aus einem eisenbasierten Werkstoff und/oder einem Leichtmetallwerkstoff hergestellt sein.The FIGS. 1 and 2 show an embodiment of a piston 10 for a structural unit 100 according to the invention. The piston 10 may be a one-piece cast or forged piston or a multi-piece joined piston. The piston 10 may be made of an iron-based material and / or a light metal material.

Die Figuren 1 und 2 zeigen beispielhaft einen einteiligen Kastenkolben 10 mit nach unten offenem sowie mit einem separaten Verschlusselement 18 verschlossenem Kühlkanal 17 sowie mit einem thermisch entkoppelten Kolbenschaft 21.The FIGS. 1 and 2 show by way of example a one-piece box piston 10 with downwardly open and closed with a separate closure element 18 cooling channel 17 and with a thermally decoupled piston shaft 21st

Der Kolben 10 weist einen Kolbenkopf 11 mit einem eine Verbrennungsmulde 14 aufweisenden Kolbenboden 13, einem umlaufenden Feuersteg 15 und einer umlaufenden Ringpartie 16 mit Ringnuten zur Aufnahme von Kolbenringen (nicht dargestellt) auf. In Höhe der Ringpartie 16 ist ein umlaufender Kühlkanal 17 vorgesehen, der nach unten offen ausgebildet und mit einem separaten Verschlusselement 18 verschlossen ist, welches mindestens eine Zuführöffnung 19 für Kühlöl aufweist.The piston 10 has a piston head 11 with a combustion bowl 14 having a piston head 13, a peripheral land 15 and a peripheral ring portion 16 with annular grooves for receiving piston rings (not shown). In the amount of the ring portion 16, a circumferential cooling channel 17 is provided, which is formed open at the bottom and closed with a separate closure element 18, which has at least one feed opening 19 for cooling oil.

Der Kolben 10 weist im Ausführungsbeispiel ferner einen thermisch entkoppelten Kolbenschaft 21 mit Kolbennaben 22 und Nabenbohrungen 23 zur Aufnahme eines Kolbenbolzens (nicht dargestellt) auf. Die Kolbennaben 22 sind in an sich bekannter Weise über Nabenanbindungen mit dem Kolbenkopf 11 verbunden. Die Kolbennaben 22 sind über Laufflächen 24a, 24b miteinander verbunden.In the exemplary embodiment, the piston 10 also has a thermally decoupled piston shaft 21 with piston hubs 22 and hub bores 23 for receiving a piston pin (not shown). The piston bosses 22 are connected in a manner known per se via hub connections to the piston head 11. The piston hubs 22 are connected to each other via running surfaces 24a, 24b.

Der Kolbenboden 13 weist im Inneren des Kolbens 10 eine Unterseite 13a auf, die erfindungsgemäß mit einem Strahlteiler 25 versehen ist. Der Strahlteiler 25 ist in Nachbarschaft der mindestens einen Zuführöffnung 19 für Kühlöl angeordnet und weist im Ausführungsbeispiel einen im Wesentlichen V-förmigen Querschnitt auf. Die Kante 25a des Strahlteilers 25 ist ausgehend von der Mittelachse M des Kolbens 10 nach außen in Richtung des Kühlkanals 17 ausgerichtet.The piston head 13 has in the interior of the piston 10 on an underside 13 a, which is provided according to the invention with a beam splitter 25. The beam splitter 25 is arranged in the vicinity of the at least one feed opening 19 for cooling oil and, in the exemplary embodiment, has a substantially V-shaped cross section. The edge 25a of the beam splitter 25 is aligned, starting from the central axis M of the piston 10, outward in the direction of the cooling channel 17.

Der Strahlteiler 25 ist im Ausführungsbeispiel einteilig mit der Unterseite 13a des Kolbenbodens 13 ausgebildet und weist eine erste Leitfläche 26 und eine zweite Leitfläche 27 für Kühlöl auf. Die erste Leitfläche 26 geht im Ausführungsbeispiel im Wesentlichen stetig in eine Innenwand 17a des Kühlkanals 17 über. Die zweite Leitfläche 27 geht im Ausführungsbeispiel im Wesentlichen stetig in die Unterseite 13a des Kolbenbodens 13 über.In the exemplary embodiment, the beam splitter 25 is formed integrally with the underside 13a of the piston crown 13 and has a first guide surface 26 and a second guide surface 27 for cooling oil. In the exemplary embodiment, the first guide surface 26 merges substantially continuously into an inner wall 17a of the cooling channel 17. The second guide surface 27 is in the embodiment substantially continuously in the bottom 13 a of the piston head 13 via.

Die Figuren 3a bis 3c und 4 zeigen eine erfindungsgemäße Baueinheit 100 in unterschiedlichen Stadien des Motorbetriebs mit einem Kolben 10 gemäß den Figuren 1 und 2 und einer Anspritzdüse 30 für Kühlöl, aus der ein Kühlölstrahl 31 austritt. Hierbei illustriert die Figur 3a die Situation am oberen Totpunkt, währen die Figur 3c die Situation am unteren Totpunkt illustriert. Die Figur 3b stellt die Situation in einer mittleren Hublage zwischen dem oberen Totpunkt und dem unteren Totpunkt dar. Die Anspritzdüse 30 ist derart im Kurbelgehäuse fest angeordnet, dass auf den Strahlteiler 25 ausgerichtet ist.The FIGS. 3a to 3c and 4 show an assembly 100 according to the invention in different stages of engine operation with a piston 10 according to the FIGS. 1 and 2 and a Anspritzdüse 30 for cooling oil from which a cooling oil jet 31 exits. This illustrates the FIG. 3a the situation at top dead center, while the Figure 3c illustrates the situation at bottom dead center. The FIG. 3b represents the situation in a middle stroke position between the top dead center and the bottom dead center. The injection nozzle 30 is fixedly arranged in the crankcase, which is aligned with the beam splitter 25.

Im Ausführungsbeispiel ist die Mittelachse A der Anspritzdüse 30 so angeordnet, dass sie mit der Mittelachse M des Kolbens 10 einen spitzen Winkel α einschließt. Dies hat zur Folge, dass der Kolben 10 während einer vollständigen Hubbewegung vom oberen Totpunkt zum unteren Totpunkt und umgekehrt jeweils einmal den Kühlölstrahl 31 kreuzt. Jeweils am oberen und unteren Totpunkt tritt der Kühlölstrahl 31 direkt in den Kühlkanal 17 ein, wobei er am Strahlteiler 25 vorbeigeführt wird. In der jeweils mittleren Hublage zwischen dem oberen und dem unteren Totpunkt trifft der Kühlölstrahl 31 auf den Strahlteiler 25 mit der Folge, dass, wie in Figur 4 vergrößert dargestellt, ein Teil 31a des Kühlölstrahls 31 in Richtung der Unterseite 13a des Kolbenbodens 13, also in Richtung des so genannten Doms, gelenkt wird, während der verbleibende Teil 31b des Kühlölstrahls 31 weiterhin in den Kühlkanal 17 eintritt. Auf diese Weise wird die Kühlung der Unterseite 13a des Kolbenbodens 13 optimiert.In the exemplary embodiment, the central axis A of the injection nozzle 30 is arranged so that it forms an acute angle α with the central axis M of the piston 10. This has the consequence that the piston 10 during a complete stroke from top dead center to bottom dead center and vice versa in each case once crosses the cooling oil jet 31. In each case at the top and bottom dead center of the cooling oil jet 31 enters directly into the cooling channel 17, wherein it is guided past the beam splitter 25. In the respective middle stroke position between the upper and the lower dead center, the cooling oil jet 31 impinges on the beam splitter 25 with the result that, as in FIG FIG. 4 shown enlarged, a portion 31a of the cooling oil jet 31 in the direction of the bottom 13a of the piston head 13, ie in the direction of the so-called dome, is directed while the remaining part 31b of the cooling oil jet 31 continues to enter the cooling channel 17. In this way, the cooling of the bottom 13 a of the piston head 13 is optimized.

Bei einer nichterfinderischen Variante könnte die Anspritzdüse 30 auch so angeordnet sein, dass ihre Mittelachse A parallel zur Mittelachse M des Kolbens 10 ausgerichtet ist, wie es in Figur 4 angedeutet ist. In diesem Fall wird der Kühlölstrahl 31 in jeder Phase der Hubbewegung des Kolbens 10 in zwei Teilstrahlen 31a, 31b aufgeteilt, die jeweils auf die Unterseite 13a des Kolbenbodens 13 bzw. in den Kühlkanal 17 gelenkt werden.In a non-inventive variant, the injection nozzle 30 could also be arranged so that its central axis A is aligned parallel to the central axis M of the piston 10, as in FIG. 4 is indicated. In this case, the cooling oil jet 31 is divided in each phase of the lifting movement of the piston 10 into two partial beams 31a, 31b, which are respectively directed to the underside 13a of the piston head 13 and into the cooling channel 17.

Claims (12)

  1. A system (100) comprising a piston (10) and an injection nozzle (30), from which a cooling oil jet 31 exits, for cooling oil for an internal combustion engine, the piston having a piston head (11) and a piston skirt (21), the piston head (11) having a piston crown (13) with an underside (13a), a circumferential ring part (16) and, in the region of the ring part (16), a circumferential cooling channel (17) with at least one feed opening (19) for cooling oil, characterized in that the piston (10) has a jet divider (25) for cooling oil on the underside (13a) of the piston crown (13) adjacently with respect to the at least one feed opening (19) for cooling oil, and in that the injection nozzle (30) is arranged below the jet divider (25) and is oriented toward the jet divider (25), wherein the jet divider (25) has a substantially V-shaped cross section with the formation of an edge (25a) which, starting from the center axis (M), is arranged toward the outside in the direction of the cooling channel (17),
    characterized
    - in that the center axis (A) of the injection nozzle (30) encloses an acute angle (α) with the center axis (M) of the piston (10),
    - in that, the jet divider (25) of the piston (10) crosses the cooling oil jet (31) in each case once during one complete stroke movement from the top dead center to the bottom dead center and vice versa,
    - in that the jet divider (25) divides the cooling oil jet (31) into in each case one part jet (31b) which is directed toward the cooling channel (17) and one part jet (31a) which is steered toward the underside (13a) of the piston crown (13),
    - in that the cooling oil jet (31) enters directly into the cooling channel (17) in each case at the top and bottom dead center, wherein said cooling oil jet (31) being guided past the jet divider (25), and
    - in that in a respective middle stroke position between the top and the bottom dead center, the cooling oil jet (31) strikes the jet divider (25).
  2. The system as claimed in claim 1, characterized in that the jet divider (25) is configured in one piece with the piston head (11).
  3. The system as claimed in claim 1, characterized in that the jet divider (25) is configured as a separate component which is connected fixedly to the piston head (11).
  4. The system as claimed in claim 1, characterized in that the jet divider (25) has a first guiding face (26) and a second guiding face (27), and in that the first guiding face (26) is assigned to the cooling channel (17) and the second guiding face (27) is assigned to the underside (13a) of the piston crown (13).
  5. The system as claimed in claim 4, characterized in that the first guiding face (26) merges continuously into an inner wall (17a) of the cooling channel (17).
  6. The system as claimed in claim 4, characterized in that the second guiding face (27) merges continuously into the underside (13a) of the piston crown (13).
  7. The system as claimed in claim 1, characterized in that the piston (10) is configured as a single-piece piston.
  8. The system as claimed in claim 1, characterized in that the piston (10) consists of two or more components which are connected to one another.
  9. The system as claimed in claim 1, characterized in that the piston (10) is configured as a box-type piston.
  10. The system as claimed in claim 1, characterized in that the cooling channel (17) of the piston (10) is configured as a closed cooling channel.
  11. The system as claimed in claim 1, characterized in that the cooling channel (17) of the piston (10) is configured as a cooling channel which is open toward the bottom and is closed by way of a closure element (18).
  12. The system as claimed in claim 14, characterized in that the piston (10) has a thermally decoupled piston skirt (21).
    Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine
EP14777501.9A 2013-08-23 2014-08-22 Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine Not-in-force EP3036419B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310013962 DE102013013962A1 (en) 2013-08-23 2013-08-23 Assembly of a piston and a Anspritzdüse for an internal combustion engine
PCT/DE2014/000421 WO2015024551A1 (en) 2013-08-23 2014-08-22 Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP3036419A1 EP3036419A1 (en) 2016-06-29
EP3036419B1 true EP3036419B1 (en) 2018-04-11

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EP14777501.9A Not-in-force EP3036419B1 (en) 2013-08-23 2014-08-22 Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine

Country Status (6)

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US (1) US9951715B2 (en)
EP (1) EP3036419B1 (en)
JP (1) JP6386048B2 (en)
CN (1) CN105579682B (en)
DE (1) DE102013013962A1 (en)
WO (1) WO2015024551A1 (en)

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FR3018552B1 (en) * 2014-03-14 2019-07-05 IFP Energies Nouvelles COMBUSTION ENGINE WITH DIRECT INJECTION OF COMPRESSION IGNITION FUEL COMPRISING PISTON COOLING MEANS.
DE102014005364A1 (en) 2014-04-11 2015-10-29 Mahle International Gmbh Assembly of a piston and an oil spray nozzle for an internal combustion engine
DE102014010528A1 (en) 2014-07-18 2016-02-18 Mahle International Gmbh Connecting rod and assembly of a piston and a connecting rod
DE102016223530A1 (en) * 2016-11-28 2018-05-30 Federal-Mogul Nürnberg GmbH Steel piston for an internal combustion engine
JP2019052604A (en) * 2017-09-15 2019-04-04 スズキ株式会社 Internal combustion engine
DE102018220193A1 (en) 2018-11-23 2020-05-28 Mahle International Gmbh Oil supply element and piston of an internal combustion engine
DE102020000381A1 (en) 2020-01-23 2021-07-29 Daimler Ag Piston for a reciprocating piston engine of a motor vehicle, in particular a motor vehicle
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DE102020006344A1 (en) 2020-10-15 2022-04-21 Daimler Ag Cooled piston for an internal combustion engine
CH718247A1 (en) * 2021-01-11 2022-07-15 Liebherr Machines Bulle Sa Internal combustion engine with nozzle arrangement for cooling and lubricating the piston-connecting rod assembly.

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Publication number Publication date
DE102013013962A1 (en) 2015-02-26
JP6386048B2 (en) 2018-09-05
JP2016532814A (en) 2016-10-20
CN105579682A (en) 2016-05-11
EP3036419A1 (en) 2016-06-29
WO2015024551A1 (en) 2015-02-26
CN105579682B (en) 2018-07-03
US9951715B2 (en) 2018-04-24
US20160208734A1 (en) 2016-07-21

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