EP3063382A1 - Piston for an internal combustion engine and cover plate for a piston - Google Patents

Piston for an internal combustion engine and cover plate for a piston

Info

Publication number
EP3063382A1
EP3063382A1 EP14799669.8A EP14799669A EP3063382A1 EP 3063382 A1 EP3063382 A1 EP 3063382A1 EP 14799669 A EP14799669 A EP 14799669A EP 3063382 A1 EP3063382 A1 EP 3063382A1
Authority
EP
European Patent Office
Prior art keywords
piston
cover plate
recess
longitudinal sides
free ends
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14799669.8A
Other languages
German (de)
French (fr)
Other versions
EP3063382B1 (en
Inventor
Ulrich Bischofberger
Harald Rüdiger MÜLLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3063382A1 publication Critical patent/EP3063382A1/en
Application granted granted Critical
Publication of EP3063382B1 publication Critical patent/EP3063382B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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 
    • F02F3/0084—Pistons  the pistons being constructed from specific materials
    • 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 a piston for an internal combustion engine, comprising a piston head and a piston skirt, wherein the piston skirt having mutually opposite pin bosses with hub bores and opposing shaft walls with treads, wherein in the lower region of the piston, a cover plate having a recess for the passage of a connecting rod , is attached.
  • the present invention further relates to such a cover for a piston.
  • a generic piston with Anspritzksselung is known from the Austrian Utility Model AT 001 919 U l.
  • This piston has a retaining plate arranged in its lower region, which is fastened to the piston by means of screwing, soldering, riveting, welding or pressing.
  • the injected from below into the piston oil is first used in the cooling channel for cooling and then used to cool the combustion chamber floor and to lubricate the small connecting rod.
  • the shaker effect creates an oil mist that provides a cooling effect.
  • German patent application DE 195 22 756 A1 discloses a piston with a arranged in its lower region, on the inside of the piston skirt encircling, ring-shaped sheet-metal part.
  • the object of the present invention is to further develop a generic piston and a generic cover plate so that the cover plate is secured as securely and captive on the piston.
  • the cover plate has two opposite longitudinal sides and two opposite free ends, that in the lower part of the
  • CONFIRMATION COPY Shaft walls grooves are provided, in which the free ends of the cover plate are received under resilient bias.
  • the cover plate according to the invention is characterized in that between the recess and at least one of the free ends a resiliently trained, in cross-section U-shaped or V-shaped indentation is provided.
  • the cover plate is held under spring bias on the piston. This eliminates complex attachment measures such as screwing, soldering, riveting, welding or pressing.
  • the cover plate provided according to the invention absorbs back-flowing cooling oil and delays or obstructs its outflow in the direction of the crankshaft.
  • the cooling oil can be introduced by means of a ⁇ lanspritzdüse directly into the interior of the piston above the cover plate or flow from a cooling passage, if present, in the interior of the piston. Due to the shaker effect occurring during engine operation, the cooling oil collected by the cover plate is moved at high frequency in the direction of the hub bores and the piston head. This results in an improved cooling effect.
  • the cover plate provided according to the invention also allows improved cooling of the shaft walls, since the collected cooling oil in the region of the shaft walls, i. between each one free end and the central recess, is accumulated and the shaker effect generated by the improved cooling effect occurs more in the region of the shaft walls.
  • a particularly preferred embodiment is that between the recess and at least one of the free ends of the cover plate is provided a resiliently shaped, in cross-section U-shaped or V-shaped indentation.
  • This indentation acts as a resilient element which serves to keep the cover plate provided according to the invention under spring bias particularly securely on the piston.
  • the biasing force of the cover plate can be regulated. In this way, the biasing force of the cover plate adapted to different piston types and piston sizes and broadened their applications.
  • the indentation also causes a retention space for cooling oil to be formed between it and the free end or the shaft wall assigned to it. Thus, in particular the cooling of the shaft walls is further improved.
  • the indentation runs parallel to the free end assigned to it.
  • the greatest possible elastic effect of the indentation can be achieved.
  • An advantageous development is to provide the cover plate on each of its bolt hub associated longitudinal sides with at least one locking element which engages behind a provided on the piston nose under resilient bias. This creates a tongue and groove connection in the manner of a clip, which represents an additional securing position of the cover plate according to the invention on the piston.
  • the entire cover plate is made of a resilient material to facilitate insertion of the cover plate into the grooves.
  • the cover plate in the region of a skirt wall of the piston has a recess to allow the passage of cooling oil.
  • the piston according to the invention is additionally provided with a circumferential cooling channel with at least one feed opening for cooling oil, it is advantageous if the recess with the at least one feed opening is formed in alignment.
  • the cooling channel can be supplied with cooling oil with the ⁇ lanspritzdüse.
  • the cover plate is at least partially curved along its longitudinal sides. This facilitates the insertion of the cover plates in the grooves of the shaft walls and also allows further control of the resilient biasing force.
  • the arched formation causes a retention space for cooling oil to be formed between the recess and the free end or the skirt wall.
  • the cooling of the shaft walls is further improved.
  • the present invention is particularly suitable for low compression height pistons. These may be steel or light metal pistons with or without a cooling channel.
  • pistons made of an aluminum-based material without a cooling channel as described, for example, in the German patent application DE 41 10 306 A1.
  • FIG. 1 a an embodiment of a cooling channel piston according to the invention with schematically indicated cover plate;
  • FIG. 1 b shows the pistons according to FIG. 1 a or FIG. 1 c in a view in the direction of the arrow A in FIG. 1 a;
  • Figure 1 c shows an embodiment of a piston according to the invention without a cooling channel with schematically indicated cover plate
  • FIG. 2 shows an embodiment of a cover plate according to the invention
  • FIG. 3 the cover plate according to FIG. 2, partially installed in a piston according to FIG.
  • FIGS. 1a, 1b and 1c show two exemplary embodiments of a piston 10, 10 'according to the invention.
  • the piston 10, 10 ' may be made of a steel material or a light metal material, in particular an aluminum-based alloy.
  • the piston 10, 10 ' preferably has a low compression height KH (eg 0.27 to 0.40).
  • KH eg 0.27 to 0.40.
  • the only difference between the two embodiments is that the piston 10 according to Figure 1 a has a cooling channel, the piston 10 'according to Figure 1 c but not.
  • the pistons 10, 10 ' are each formed as a one-piece box piston.
  • the pistons 10, 10 ' have, in a manner known per se, a piston head 11 and a piston shaft 17.
  • the piston head 1 1 has a piston head 12, a combustion bowl 13, a peripheral land 14 and a peripheral ring portion 15 with annular grooves for piston rings (not shown).
  • a circumferential cooling channel 16 is provided, which has at least one feed opening 16a for cooling oil.
  • the piston skirt 17 has mutually opposite piston hubs 18 with hub bores 19 for receiving a piston pin (not shown).
  • the piston hubs 18 are connected to each other in a conventional manner via running surfaces 22 having opposing shaft walls 21.
  • a cover plate 24 is provided in the lower region of the shaft walls 21.
  • 21 grooves 23 are provided in the lower region of the shaft walls, which are shown in dashed lines in Figure 1 b.
  • the cover plate 24 has a recess 26 which serves to pass a connecting rod during engine operation.
  • the cover plate 24 has two piston bosses 18 associated longitudinal sides 27.
  • the cover plate 24 should cover the largest possible area of the underside of the piston 10 or 10 '.
  • Figure 2 shows an embodiment of Abdeckpiatte invention 24.
  • the Abdeckpiatte 24 is made in the embodiment of a resilient material, slightly curved overall and has two opposite longitudinal sides 27 and two opposing free ends 25. Further, an approximately central recess 26 is provided for the passage of a connecting rod in engine operation.
  • a resiliently trained, in cross-section U-shaped or V-shaped indentation 28 is provided between the recess 26 and each of the free ends 25 of the Abdeckpiatte 24 .
  • Each of these indentations 28 extends in the exemplary embodiment substantially parallel to its associated free end 25 and acts as a resilient element which serves to keep the Abdeckpiatte 24 under spring bias particularly secure on the piston 10.
  • Each indentation 28 has a defined axial depth T. By means of this axial depth T of the indentation 28, the mobility of the free ends 25 in the longitudinal direction, ie parallel to the longitudinal sides 27, can be regulated. The greater the axial depth T, the more flexible are the free ends 25 of the cover plate 24.
  • the Abdeckpiatte 24 is provided on each of its longitudinal sides 27 with exactly two locking elements 29, which are formed in cross-section substantially S-shaped.
  • the locking elements 29 are also resilient.
  • the Abdeckpiatte 24 is provided for a piston for use in a motor with Anspritzkühlung, the Abdeckpiatte 24 in the region of one of its free ends a recess 31 in order to allow the passage of cooling oil during engine operation.
  • FIG. 3 shows by way of example the lower region of a piston 10 according to FIG. 1 a or 10 'according to FIG. 1 c with a cover plate 24 according to FIG. 2 inserted incompletely into the piston 10 or 10'.
  • the lower region of the shaft walls 21 in the exemplary embodiment are continuous Grooves 23 provided.
  • the free end 25 of Abdeckpiatte 24 are received under resilient bias.
  • at least part of the Abdeckpiatte 24 be formed resiliently, for example.
  • the spring-elastic design of the cover plate 24 takes place predominantly by the elastically formed indentations 28.
  • the free ends 25 are moved in the longitudinal direction and in the direction of the recess 26, wherein the indentations 28 give way.
  • the cover plate 24 is fixed in the piston 10 and 10 '.
  • the axial depth T of the indentations 28 influences the resilient preloading force under which the cover 24 is held in the piston 10 or 10 '. The smaller the axial depth T is dimensioned, the greater the resulting preload force.
  • the recesses 28 with their associated shank walls 21 form a retaining space 32 for cooling oil.
  • the cooling of the shaft walls 21 is further improved.
  • 18 lugs 33 are provided in the region of the piston hubs, which correspond to the latching elements 29 located on the longitudinal sides 27 of the cover plate 24.
  • the locking elements 29 engage behind the lugs 33 corresponding to them, so that a clip-like tongue-and-groove snap connection is formed (not shown in FIG. 3).
  • the recess 31 is arranged substantially in alignment with the feed opening 16a in the cooling channel 16, so that it too can be supplied with cooling oil.
  • the inventively provided cover plate 24 catches back flowing cooling oil and delays its outflow in the direction of the crankshaft. Due to the shaker effect occurring during engine operation, the cooling oil collected by the cover plate 24 is moved in high frequency in the direction of the hub bores 19 and the piston head 1 1 back and forth. This results in an improved cooling effect, in particular in the region of the shaft walls 21, since the captured cooling oil is accumulated in this area.

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

Abstract

The present invention relates to a piston (10, 10') for an internal combustion engine, having a piston head (11) and a piston skirt (17), wherein the piston skirt (17) has piston bosses (18) which lie opposite one another and have boss bores (19), and skirt walls (21) which lie opposite one another and have running surfaces (22), wherein a cover plate (24) which has a recess (26) for the passage of a connecting rod is fastened in the lower region of the piston (10). It is provided according to the invention that the cover plate (24) has two longitudinal sides (27) which lie opposite one another and two free ends (25) which lie opposite one another, and in that grooves (23) are provided in the lower region of the skirt walls (21), in which grooves (23) the free ends (25) of the cover plate (24) are received with resilient prestress.

Description

Kolben für einen Verbrennungsmotor und Abdeckplatte für einen Kolben  Piston for an internal combustion engine and cover plate for a piston
Beschreibung description
Die vorliegende Erfindung betrifft einen Kolben für einen Verbrennungsmotor, mit einem Kolbenkopf und einem Kolbenschaft, wobei der Kolbenschaft einander gegenüberliegende Bolzennaben mit Nabenbohrungen sowie einander gegenüberliegende Schaftwände mit Laufflächen aufweist, wobei im unteren Bereich des Kolbens eine Abdeckplatte, welche eine Ausnehmung zum Durchtritt eines Pleuels aufweist, befestigt ist. Die vorliegende Erfindung betrifft ferner eine derartige Abdeckung für einen Kolben. The present invention relates to a piston for an internal combustion engine, comprising a piston head and a piston skirt, wherein the piston skirt having mutually opposite pin bosses with hub bores and opposing shaft walls with treads, wherein in the lower region of the piston, a cover plate having a recess for the passage of a connecting rod , is attached. The present invention further relates to such a cover for a piston.
Ein gattungsgemäßer Kolben mit Anspritzkühlung ist aus der österreichischen Gebrauchsmusterschrift AT 001 919 U l bekannt. Dieser Kolben weist ein in seinem unteren Bereich angeordnetes Rückhalteblech auf, das mittels Verschrauben, Löten, Nieten, Schweißen oder Einpressen am Kolben befestigt ist. Das von unten in den Kolben eingespritzte Öl wird zunächst im Kühlkanal zur Kühlung verwendet und im Anschluss daran zur Kühlung des Brennraumbodens und zur Schmierung des kleinen Pleuelauges eingesetzt. Durch den Shaker-Effekt wird ein Ölnebel gebildet, der für eine entsprechende Kühlwirkung sorgt. A generic piston with Anspritzkühlung is known from the Austrian Utility Model AT 001 919 U l. This piston has a retaining plate arranged in its lower region, which is fastened to the piston by means of screwing, soldering, riveting, welding or pressing. The injected from below into the piston oil is first used in the cooling channel for cooling and then used to cool the combustion chamber floor and to lubricate the small connecting rod. The shaker effect creates an oil mist that provides a cooling effect.
Die deutsche Offenlegungsschrift DE 195 22 756 A1 offenbart einen Kolben mit einem in seinem unteren Bereich angeordneten, auf der Innenseite des Kolbenschafts umlaufenden, rin- nenförmigen Blechteil. The German patent application DE 195 22 756 A1 discloses a piston with a arranged in its lower region, on the inside of the piston skirt encircling, ring-shaped sheet-metal part.
Die Aufgabe der vorliegenden Erfindung besteht darin, einen gattungsgemäßen Kolben sowie eine gattungsgemäße Abdeckplatte so weiterzuentwickeln, dass die Abdeckplatte möglichst sicher und unverlierbar am Kolben befestigt ist. The object of the present invention is to further develop a generic piston and a generic cover plate so that the cover plate is secured as securely and captive on the piston.
Die Lösung besteht darin, dass die Abdeckplatte zwei einander gegenüberliegende Längsseiten und zwei einander gegenüberliegende freie Enden aufweist, dass im unteren Bereich der der The solution is that the cover plate has two opposite longitudinal sides and two opposite free ends, that in the lower part of the
BESTÄTIGUNGSKOPIE Schaftwände Nuten vorgesehen sind, in denen die freien Enden der Abdeckplatte unter federnder Vorspannung aufgenommen sind. CONFIRMATION COPY Shaft walls grooves are provided, in which the free ends of the cover plate are received under resilient bias.
Die erfindungsgemäße Abdeckplatte zeichnet sich dadurch aus, dass zwischen der Ausnehmung und zumindest einem der freien Enden eine federelastisch ausgebildete, im Querschnitt U-förmige oder V-förmige Einformung vorgesehen ist. The cover plate according to the invention is characterized in that between the recess and at least one of the free ends a resiliently trained, in cross-section U-shaped or V-shaped indentation is provided.
Erfindungsgemäß ist vorgesehen, dass die Abdeckplatte unter federnder Vorspannung am Kolben gehalten ist. Damit entfallen aufwändige Befestigungsmaßnahmen wie Verschrauben, Löten, Nieten, Schweißen oder Einpressen. According to the invention it is provided that the cover plate is held under spring bias on the piston. This eliminates complex attachment measures such as screwing, soldering, riveting, welding or pressing.
Die erfindungsgemäß vorgesehene Abdeckplatte fängt zurückfließendes Kühlöl auf und verzögert bzw. behindert dessen Abfluss in Richtung Kurbelwelle. Das Kühlöl kann mittels einer Ölanspritzdüse direkt in den Innenraum des Kolbens oberhalb der Abdeckplatte eingeleitet werden oder aus einem Kühlkanal, falls vorhanden, in den Innenraum des Kolbens fließen. Durch den im Motorbetrieb auftretenden Shakereffekt wird das von der Abdeckplatte aufgefangene Kühlöl in hoher Frequenz in Richtung der Nabenbohrungen und des Kolbenkopfs hin und her bewegt. Daraus resultiert eine verbesserte Kühlwirkung. The cover plate provided according to the invention absorbs back-flowing cooling oil and delays or obstructs its outflow in the direction of the crankshaft. The cooling oil can be introduced by means of a Ölanspritzdüse directly into the interior of the piston above the cover plate or flow from a cooling passage, if present, in the interior of the piston. Due to the shaker effect occurring during engine operation, the cooling oil collected by the cover plate is moved at high frequency in the direction of the hub bores and the piston head. This results in an improved cooling effect.
Bei Messungen wurde festgestellt, dass die Betriebstemperatur des Kolbenkopfes, der Ringnuten und der Nabenbohrungen signifikant reduziert werden konnten. Im Vergleich zu Betriebstemperaturen von 200°C bis 220°C für Kolben gemäß dem Stand der Technik waren die Betriebstemperaturen bei erfindungsgemäßen Kolben um bis zu 30% reduziert. Measurements showed that the operating temperature of the piston head, the annular grooves and the hub bores could be significantly reduced. In comparison to operating temperatures of 200 ° C to 220 ° C for pistons according to the prior art, the operating temperatures of the piston according to the invention were reduced by up to 30%.
Die erfindungsgemäß vorgesehene Abdeckplatte erlaubt ferner eine verbesserte Kühlung der Schaftwände, da das aufgefangene Kühlöl im Bereich der Schaftwände, d.h. zwischen jeweils einem freien Ende und der mittigen Ausnehmung, akkumuliert wird und die vom Shaker-Effekt erzeugte verbesserte Kühlwirkung verstärkt im Bereich der Schaftwände auftritt. The cover plate provided according to the invention also allows improved cooling of the shaft walls, since the collected cooling oil in the region of the shaft walls, i. between each one free end and the central recess, is accumulated and the shaker effect generated by the improved cooling effect occurs more in the region of the shaft walls.
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen. Eine besonders bevorzugte Ausführungsform besteht darin, dass zwischen der Ausnehmung und zumindest einem der freien Enden der Abdeckplatte eine federelastisch ausgebildete, im Querschnitt U-förmige oder V-förmige Einformung vorgesehen ist. Diese Einformung wirkt als federelastisches Element, welches dazu dient, die erfindungsgemäß vorgesehene Abdeckplatte unter federnder Vorspannung besonders sicher am Kolben zu halten. Ferner kann mittels der axialen Tiefe der Einformung die Vorspannkraft der Abdeckplatte reguliert werden. Auf diese Weise kann die Vorspannkraft der Abdeckplatte an verschiedene Kolbentypen und Kolbengrößen angepasst und ihre Anwendungsmöglichkeiten verbreitert werden. Die Einformung bewirkt ferner, dass zwischen ihr und dem ihr zugeordneten freien Ende bzw. der Schaftwand ein Rückhalteraum für Kühlöl gebildet wird. Damit wird insbesondere die Kühlung der Schaftwände weiter verbessert. Advantageous developments emerge from the subclaims. A particularly preferred embodiment is that between the recess and at least one of the free ends of the cover plate is provided a resiliently shaped, in cross-section U-shaped or V-shaped indentation. This indentation acts as a resilient element which serves to keep the cover plate provided according to the invention under spring bias particularly securely on the piston. Further, by means of the axial depth of the indentation, the biasing force of the cover plate can be regulated. In this way, the biasing force of the cover plate adapted to different piston types and piston sizes and broadened their applications. The indentation also causes a retention space for cooling oil to be formed between it and the free end or the shaft wall assigned to it. Thus, in particular the cooling of the shaft walls is further improved.
Zweckmäßigerweise verläuft die Einformung parallel zu dem ihr zugeordneten freien Ende. Damit kann die größtmögliche federelastische Wirkung der Einformung erzielt werden. Expediently, the indentation runs parallel to the free end assigned to it. Thus, the greatest possible elastic effect of the indentation can be achieved.
Eine vorteilhafte Weiterbildung besteht darin, die Abdeckplatte an jeder ihrer den Bolzennaben zugeordneten Längsseiten mit mindestens einem Rastelement zu versehen, welches eine am Kolben vorgesehene Nase unter federnder Vorspannung hintergreift. Dadurch entsteht eine Nut-Feder-Verbindung nach Art eines Clips, welche eine zusätzliche Lagesicherung der erfindungsgemäßen Abdeckplatte am Kolben darstellt. An advantageous development is to provide the cover plate on each of its bolt hub associated longitudinal sides with at least one locking element which engages behind a provided on the piston nose under resilient bias. This creates a tongue and groove connection in the manner of a clip, which represents an additional securing position of the cover plate according to the invention on the piston.
Vorzugsweise ist die gesamte Abdeckplatte aus einem federelastischen Werkstoff hergestellt, um das Einsetzen der Abdeckplatte in die Nuten zu vereinfachen. Preferably, the entire cover plate is made of a resilient material to facilitate insertion of the cover plate into the grooves.
Falls der erfindungsgemäße Kolben in einem Motor mit Anspritzkühlung eingesetzt wird, weist die Abdeckplatte im Bereich einer Schaftwand des Kolbens eine Aussparung auf, um den Durchtritt von Kühlöl zu ermöglichen. If the piston of the invention is used in a motor with Anspritzkühlung, the cover plate in the region of a skirt wall of the piston has a recess to allow the passage of cooling oil.
Falls der erfindungsgemäße Kolben zusätzlich mit einem umlaufenden Kühlkanal mit mindestens einer Zuführöffnung für Kühlöl versehen ist, ist es von Vorteil, wenn die Aussparung mit der mindestens einen Zuführöffnung fluchtend ausgebildet ist. In diesem Fall kann mit der Ölanspritzdüse auch der Kühlkanal mit Kühlöl versorgt werden. If the piston according to the invention is additionally provided with a circumferential cooling channel with at least one feed opening for cooling oil, it is advantageous if the recess with the at least one feed opening is formed in alignment. In this case, the cooling channel can be supplied with cooling oil with the Ölanspritzdüse.
Vorzugsweise ist die Abdeckplatte zumindest bereichsweise entlang ihrer Längsseiten gewölbt ausgebildet. Dies erleichtert das Einsetzen der Abdeckplatten in die Nuten der Schaftwände und erlaubt ferner eine weitere Kontrolle der federelastischen Vorspannkraft. Schließlich bewirkt die gewölbte Ausbildung, dass zwischen der Ausnehmung und dem freien Ende bzw. der Schaftwand ein Rückhalteraum für Kühlöl gebildet wird. Damit wird insbesondere die Kühlung der Schaftwände weiter verbessert. Preferably, the cover plate is at least partially curved along its longitudinal sides. This facilitates the insertion of the cover plates in the grooves of the shaft walls and also allows further control of the resilient biasing force. Finally, the arched formation causes a retention space for cooling oil to be formed between the recess and the free end or the skirt wall. Thus, in particular the cooling of the shaft walls is further improved.
Die vorliegende Erfindung ist insbesondere für Kolben mit geringer Kompressionshöhe geeignet. Dabei kann es sich um Stahl- oder Leichtmetallkolben mit oder ohne Kühlkanal handeln. Ein bevorzugtes Anwendungsgebiet sind Kolben aus einem aluminiumbasierten Werkstoff ohne Kühlkanal, wie sie bspw. in der deutschen Offenlegungsschrift DE 41 10 306 A1 beschrieben sind. The present invention is particularly suitable for low compression height pistons. These may be steel or light metal pistons with or without a cooling channel. A preferred field of application are pistons made of an aluminum-based material without a cooling channel, as described, for example, in the German patent application DE 41 10 306 A1.
Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Es zeigen in einer schematischen, nicht maßstabsgetreuen Darstellung: 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:
Figur 1 a ein Ausführungsbeispiel eines erfindungsgemäßen Kühlkanalkolbens mit schematisch angedeuteter Abdeckplatte; Figure 1 a an embodiment of a cooling channel piston according to the invention with schematically indicated cover plate;
Figur 1 b die Kolben gemäß Figur 1 a bzw. Figur 1 c in einer Ansicht in Richtung des Pfeils A in Figur 1 a; FIG. 1 b shows the pistons according to FIG. 1 a or FIG. 1 c in a view in the direction of the arrow A in FIG. 1 a;
Figur 1 c ein Ausführungsbeispiel eines erfindungsgemäßen Kolbens ohne Kühlkanal mit schematisch angedeuteter Abdeckplatte; Figure 1 c shows an embodiment of a piston according to the invention without a cooling channel with schematically indicated cover plate;
Figur 2 ein Ausführungsbeispiel einer erfindungsgemäßen Abdeckplatte; Figur 3 die Abdeckplatte gemäß Figur 2, teilweise in einen Kolben gemäß Figur 1 eingebaut. Figure 2 shows an embodiment of a cover plate according to the invention; FIG. 3 the cover plate according to FIG. 2, partially installed in a piston according to FIG.
Die Figuren l a, 1 b und 1 c zeigen zwei Ausführungsbeispiele eines erfindungsgemäßen Kolbens 10, 10'. Der Kolben 10, 10' kann aus einem Stahl Werkstoff oder einem Leichtmetallwerkstoff, insbesondere einer aluminiumbasierten Legierung, hergestellt sein. Der Kolben 10, 10' weist bevorzugt eine niedrige Kompressionshöhe KH (bspw. 0,27 bis 0,40) auf. Der einzige Unterschied zwischen den beiden Ausführungsbeispielen besteht darin, dass der Kolben 10 gemäß Figur 1 a einen Kühlkanal aufweist, der Kolben 10' gemäß Figur 1 c jedoch nicht. FIGS. 1a, 1b and 1c show two exemplary embodiments of a piston 10, 10 'according to the invention. The piston 10, 10 'may be made of a steel material or a light metal material, in particular an aluminum-based alloy. The piston 10, 10 'preferably has a low compression height KH (eg 0.27 to 0.40). The only difference between the two embodiments is that the piston 10 according to Figure 1 a has a cooling channel, the piston 10 'according to Figure 1 c but not.
Im Ausführungsbeispiel sind die Kolben 10, 10' jeweils als einteiliger Kastenkolben ausgebildet. Die Kolben 10, 10' weisen in an sich bekannter Weise einen Kolbenkopf 1 1 und einen Kolbenschaft 17 auf. Der Kolbenkopf 1 1 weist einen Kolbenboden 12, eine Verbrennungsmulde 13, einen umlaufenden Feuersteg 14 und eine umlaufende Ringpartie 15 mit Ringnuten für Kolbenringe (nicht dargestellt) auf. In Höhe der Ringpartie 1 5 ist ein umlaufender Kühlkanal 16 vorgesehen, der mindestens eine Zuführöffnung 16a für Kühlöl aufweist. Der Kolbenschaft 17 weist einander gegenüberliegende Kolbennaben 18 mit Nabenbohrungen 19 zur Aufnahme eines Kolbenbolzens (nicht dargestellt) auf. Die Kolbennaben 18 sind in an sich bekannter Weise über Laufflächen 22 aufweisende einander gegenüberliegende Schaftwände 21 miteinander verbunden. In the exemplary embodiment, the pistons 10, 10 'are each formed as a one-piece box piston. The pistons 10, 10 'have, in a manner known per se, a piston head 11 and a piston shaft 17. The piston head 1 1 has a piston head 12, a combustion bowl 13, a peripheral land 14 and a peripheral ring portion 15 with annular grooves for piston rings (not shown). In the amount of the ring section 1 5 a circumferential cooling channel 16 is provided, which has at least one feed opening 16a for cooling oil. The piston skirt 17 has mutually opposite piston hubs 18 with hub bores 19 for receiving a piston pin (not shown). The piston hubs 18 are connected to each other in a conventional manner via running surfaces 22 having opposing shaft walls 21.
Wie in den Figuren 1 a bis 1 c angedeutet ist, ist im unteren Bereich der Schaftwände 21 eine Abdeckplatte 24 vorgesehen. Insbesondere aus Figur 1 b ist zu entnehmen, dass im unteren Bereich der Schaftwände 21 Nuten 23 vorgesehen sind, die in Figur 1 b gestrichelt dargestellt sind. In diesen Nuten 23 sind die freien Enden 25 der Abdeckplatte 24 unter federnder Vorspannung aufgenommen. Die Abdeckplatte 24 weist eine Ausnehmung 26 auf, die im Motorbetrieb dem Durchtritt eines Pleuels dient. Ferner weist die Abdeckplatte 24 zwei den Kolbennaben 18 zugeordnete Längsseiten 27 auf. Um eine optimal verbesserte Kühlwirkung zu erzielen, sollte die Abdeckplatte 24 den größtmöglichen Bereich der Unterseite des Kolbens 10 bzw. 10' abdecken. Figur 2 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Abdeckpiatte 24. Die Abdeckpiatte 24 ist im Ausführungsbeispiel aus einem federelastischen Werkstoff hergestellt, insgesamt leicht gewölbt ausgebildet und weist zwei einander gegenüberliegende Längsseiten 27 und zwei einander gegenüberliegende freie Enden 25 auf. Ferner ist eine in etwa mittige Ausnehmung 26 zum Durchtritt eines Pleuels im Motorbetrieb vorgesehen. As indicated in FIGS. 1 a to 1 c, a cover plate 24 is provided in the lower region of the shaft walls 21. In particular, from Figure 1 b can be seen that 21 grooves 23 are provided in the lower region of the shaft walls, which are shown in dashed lines in Figure 1 b. In these grooves 23, the free ends 25 of the cover plate 24 are received under resilient bias. The cover plate 24 has a recess 26 which serves to pass a connecting rod during engine operation. Furthermore, the cover plate 24 has two piston bosses 18 associated longitudinal sides 27. In order to achieve an optimally improved cooling effect, the cover plate 24 should cover the largest possible area of the underside of the piston 10 or 10 '. Figure 2 shows an embodiment of Abdeckpiatte invention 24. The Abdeckpiatte 24 is made in the embodiment of a resilient material, slightly curved overall and has two opposite longitudinal sides 27 and two opposing free ends 25. Further, an approximately central recess 26 is provided for the passage of a connecting rod in engine operation.
Im Ausführungsbeispiel ist zwischen der Ausnehmung 26 und jedem der freien Enden 25 der Abdeckpiatte 24 eine federelastisch ausgebildete, im Querschnitt U-förmige oder V-förmige Einformung 28 vorgesehen. Jede dieser Einformung 28 verläuft im Ausführungsbeispiel im Wesentlichen parallel zu dem ihr zugeordneten freien Ende 25 und wirkt als federelastisches Element, welches dazu dient, die Abdeckpiatte 24 unter federnder Vorspannung besonders sicher am Kolben 10 zu halten. Jede Einformung 28 weist eine definierte axiale Tiefe T auf. Mittels dieser axialen Tiefe T der Einformung 28 kann die Beweglichkeit der freien Enden 25 in Längsrichtung, also parallel zu den Längsseiten 27, reguliert werden. Je größer die axiale Tiefe T ist, desto beweglicher sind die freien Enden 25 der Abdeckpiatte 24. In the embodiment, between the recess 26 and each of the free ends 25 of the Abdeckpiatte 24 a resiliently trained, in cross-section U-shaped or V-shaped indentation 28 is provided. Each of these indentations 28 extends in the exemplary embodiment substantially parallel to its associated free end 25 and acts as a resilient element which serves to keep the Abdeckpiatte 24 under spring bias particularly secure on the piston 10. Each indentation 28 has a defined axial depth T. By means of this axial depth T of the indentation 28, the mobility of the free ends 25 in the longitudinal direction, ie parallel to the longitudinal sides 27, can be regulated. The greater the axial depth T, the more flexible are the free ends 25 of the cover plate 24.
Im Ausführungsbeispiel ist die Abdeckpiatte 24 an jeder ihrer Längsseiten 27 mit genau zwei Rastelementen 29 versehen, die im Querschnitt im Wesentlichen S-förmig ausgebildet sind. Die Rastelemente 29 sind ferner federelastisch ausgebildet. In the exemplary embodiment, the Abdeckpiatte 24 is provided on each of its longitudinal sides 27 with exactly two locking elements 29, which are formed in cross-section substantially S-shaped. The locking elements 29 are also resilient.
Falls die Abdeckpiatte 24 für einen Kolben zum Einsatz in einem Motor mit Anspritzkühlung vorgesehen ist, weist die Abdeckpiatte 24 im Bereich eines ihrer freien Enden eine Aussparung 31 auf, um im Motorbetrieb den Durchtritt von Kühlöl zu ermöglichen. If the Abdeckpiatte 24 is provided for a piston for use in a motor with Anspritzkühlung, the Abdeckpiatte 24 in the region of one of its free ends a recess 31 in order to allow the passage of cooling oil during engine operation.
Figur 3 zeigt beispielhaft den unteren Bereich eines Kolbens 10 gemäß Figur 1 a bzw. 10' gemäß Figur 1 c mit einer unvollständig in den Kolben 10 bzw. 10' eingesetzten Abdeckpiatte 24 gemäß Figur 2. Im unteren Bereich der Schaftwände 21 sind im Ausführungsbeispiel durchgehende Nuten 23 vorgesehen. In diesen Nuten 23 sind die freien Ende 25 der Abdeckpiatte 24 unter federnder Vorspannung aufgenommen. Hierfür muss zumindest ein Teil der Abdeckpiatte 24 federelastisch ausgebildet sein, bspw. mittels Herstellung aus einem federelastischen Werkstoff, wobei eine entlang der Längsseiten 27 gewölbte Ausbildung der Abdeckplatte 24 unterstützend wirken kann. FIG. 3 shows by way of example the lower region of a piston 10 according to FIG. 1 a or 10 'according to FIG. 1 c with a cover plate 24 according to FIG. 2 inserted incompletely into the piston 10 or 10'. In the lower region of the shaft walls 21 in the exemplary embodiment are continuous Grooves 23 provided. In these grooves 23, the free end 25 of Abdeckpiatte 24 are received under resilient bias. For this purpose, at least part of the Abdeckpiatte 24 be formed resiliently, for example. By means of manufacture of a resilient material, wherein a curved along the longitudinal sides 27 training the cover plate 24 can support.
Im Ausführungsbeispiel erfolgt die federelastische Ausbildung der Abdeckplatte 24 überwiegend durch die federelastisch ausgebildeten Einformungen 28. Zur Montage der Abdeckplatte 24 in den Nuten 23 der Schaftwände 21 werden die freien Enden 25 in Längsrichtung und in Richtung der Ausnehmung 26 bewegt, wobei die Einformungen 28 nachgeben. Wenn die Abdeckplatte 24 sich in der gewünschten Position in Bezug auf die Nuten 23 befindet, werden die freien Enden 25 freigegeben und schnappen in die Nuten 23 ein. Damit ist die Abdeckplatte 24 im Kolben 10 bzw. 10' fixiert. Hierbei beeinflusst die axiale Tiefe T der Einformungen 28 die federelastische Vorspannkraft, unter welcher die Abdeckung 24 im Kolben 10 bzw. 10' gehalten ist. Je geringer die axiale Tiefe T bemessen ist, desto größer ist die resultierende Vorspannkraft. In the exemplary embodiment, the spring-elastic design of the cover plate 24 takes place predominantly by the elastically formed indentations 28. For mounting the cover plate 24 in the grooves 23 of the shaft walls 21, the free ends 25 are moved in the longitudinal direction and in the direction of the recess 26, wherein the indentations 28 give way. When the cover plate 24 is in the desired position with respect to the grooves 23, the free ends 25 are released and snap into the grooves 23. Thus, the cover plate 24 is fixed in the piston 10 and 10 '. Here, the axial depth T of the indentations 28 influences the resilient preloading force under which the cover 24 is held in the piston 10 or 10 '. The smaller the axial depth T is dimensioned, the greater the resulting preload force.
Die Einformungen 28 mit den ihnen zugeordneten Schaftwänden 21 bilden einen Rückhalteraum 32 für Kühlöl. Damit wird insbesondere die Kühlung der Schaftwände 21 weiter verbessert. The recesses 28 with their associated shank walls 21 form a retaining space 32 for cooling oil. Thus, in particular the cooling of the shaft walls 21 is further improved.
Um eine zusätzliche Lagesicherung der Abdeckplatte 24 im Kolben zu erreichen, sind im Bereich der Kolbennaben 18 Nasen 33 vorgesehen, die mit den an den Längsseiten 27 der Abdeckplatte 24 befindlichen Rastelementen 29 korrespondieren. Wenn die Abdeckplatte 24 vollständig in den Kolben 10 bzw. 10' eingesetzt ist, hintergreifen die Rastelemente 29 die mit ihnen korrespondieren Nasen 33, so dass eine clipartige Nut-Feder-Schnappverbindung gebildet wird (in Figur 3 nicht dargestellt). In order to achieve an additional securing position of the cover plate 24 in the piston, 18 lugs 33 are provided in the region of the piston hubs, which correspond to the latching elements 29 located on the longitudinal sides 27 of the cover plate 24. When the cover plate 24 is fully inserted into the piston 10 or 10 ', the locking elements 29 engage behind the lugs 33 corresponding to them, so that a clip-like tongue-and-groove snap connection is formed (not shown in FIG. 3).
Im Ausführungsbeispiel ist die Aussparung 31 im Wesentlichen fluchtend mit der Zuführöffnung 16a im Kühlkanal 1 6 angeordnet, so dass auch dieser mit Kühlöl versorgt werden kann. Die erfindungsgemäß vorgesehene Abdeckplatte 24 fängt zurückfließendes Kühlöl auf und verzögert dessen Abfluss in Richtung Kurbelwelle. Durch den im Motorbetrieb auftretenden Shakereffekt wird das von der Abdeckplatte 24 aufgefangene Kühlöl in hoher Frequenz in Richtung der Nabenbohrungen 19 und des Kolbenkopfs 1 1 hin und her bewegt. Daraus resultiert eine verbesserte Kühlwirkung, insbesondere im Bereich der Schaftwände 21 , da das aufgefangene Kühlöl in diesem Bereich akkumuliert wird. In the exemplary embodiment, the recess 31 is arranged substantially in alignment with the feed opening 16a in the cooling channel 16, so that it too can be supplied with cooling oil. The inventively provided cover plate 24 catches back flowing cooling oil and delays its outflow in the direction of the crankshaft. Due to the shaker effect occurring during engine operation, the cooling oil collected by the cover plate 24 is moved in high frequency in the direction of the hub bores 19 and the piston head 1 1 back and forth. This results in an improved cooling effect, in particular in the region of the shaft walls 21, since the captured cooling oil is accumulated in this area.

Claims

Patentansprüche claims
1. Kolben (10, 10') für einen Verbrennungsmotor, mit einem Kolbenkopf (1 1 ) und einem Kolbenschaft (17), wobei der Kolbenschaft (17) einander gegenüberliegende Kolbennaben (18) mit Nabenbohrungen (19) sowie einander gegenüberliegende Schaftwände (21 ) mit Laufflächen (22) aufweist, wobei im unteren Bereich des Kolbens (10) eine Abdeck- platte (24), welche eine Ausnehmung (26) zum Durchtritt eines Pleuels aufweist, befestigt ist, dadurch gekennzeichnet, dass die Abdeckplatte (24) zwei einander gegenüberliegende Längsseiten (27) und zwei einander gegenüberliegende freie Enden (25) aufweist, dass im unteren Bereich der Schaftwände (21 ) Nuten (23) vorgesehen sind, in denen die freien Enden (25) der Abdeckplatte (24) unter federnder Vorspannung aufgenommen sind. A piston (10, 10 ') for an internal combustion engine, comprising a piston head (1 1) and a piston shaft (17), the piston shaft (17) having mutually opposite piston hubs (18) with hub bores (19) and mutually opposite shaft walls (21 ) having running surfaces (22), wherein in the lower region of the piston (10) has a cover plate (24) which has a recess (26) for the passage of a connecting rod, characterized in that the cover plate (24) has two having opposite longitudinal sides (27) and two opposite free ends (25), that in the lower region of the shaft walls (21) grooves (23) are provided, in which the free ends (25) of the cover plate (24) received under resilient bias are.
2. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass zwischen der Ausnehmung (26) und zumindest einem der freien Enden (25) der Abdeckplatte (24) eine federelastisch ausgebildete, im Querschnitt U-förmige oder V-förmige Einformung (28) vorgesehen ist. 2. Piston according to claim 1, characterized in that between the recess (26) and at least one of the free ends (25) of the cover plate (24) is provided a resiliently shaped, in cross-section U-shaped or V-shaped indentation (28) ,
3. Kolben nach Anspruch 2, dadurch gekennzeichnet, dass die Einformung (28) parallel zu dem ihr zugeordneten freien Ende (25) verläuft. 3. Piston according to claim 2, characterized in that the indentation (28) extends parallel to the associated free end (25).
4. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass die Abdeckplatte (24) an jeder ihrer den Kolbennaben (18) zugeordneten Längsseiten (27) mindestens ein Rastelement (29) aufweist, welches eine am Kolben (10, 10') vorgesehene Nase (33) unter federnder Vorspannung hintergreift. 4. Piston according to claim 1, characterized in that the cover plate (24) at each of the piston hubs (18) associated longitudinal sides (27) has at least one latching element (29) which on the piston (10, 10 ') provided nose (27) 33) engages behind under resilient bias.
5. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass die Abdeckplatte (24) aus einem federelastischen Werkstoff hergestellt ist. 5. Piston according to claim 1, characterized in that the cover plate (24) is made of a resilient material.
6. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass in der Abdeckplatte (24) im Bereich einer Schaftwand (21 ) des Kolbens (10, 10') eine Aussparung (31 ) vorgesehen ist. 6. Piston according to claim 1, characterized in that in the cover plate (24) in the region of a skirt wall (21) of the piston (10, 10 ') has a recess (31) is provided.
7. Kolben nach Anspruch 6, dadurch gekennzeichnet, dass der Kolbenkopf (1 1 ) des Kolbens (10) einen umlaufenden Kühlkanal (16) mit mindestens einer Zuführöffnung (16a) für Kühlöl aufweist und dass die Aussparung (31 ) mit der mindestens einen Zuführöffnung (16a) fluchtend ausgebildet ist. 7. Piston according to claim 6, characterized in that the piston head (1 1) of the piston (10) has a peripheral cooling channel (16) with at least one feed opening (16a) for cooling oil and that the recess (31) with the at least one feed opening (16a) is formed in alignment.
8. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass die Abdeckplatte (24) zumindest bereichsweise entlang ihrer Längsseiten (27) gewölbt ausgebildet ist. 8. Piston according to claim 1, characterized in that the cover plate (24) at least partially curved along its longitudinal sides (27) is formed.
9. Abdeckplatte (24) zur Befestigung im unteren Bereich von Schaftwänden (21 ) eines Kolbens (10) für einen Verbrennungsmotor, wobei die Abdeckplatte (24) zwei einander gegenüberliegende Längsseiten (27) und zwei einander gegenüberliegende freie Enden (25) sowie eine Ausnehmung (26) zum Durchtritt eines Pleuels aufweist, dadurch gekennzeichnet, dass zwischen der Ausnehmung (26) und zumindest einem der freien Enden (25) eine federelastisch ausgebildete, im Querschnitt U-förmige oder V-förmige Einfor- mung (28) vorgesehen ist. 9. cover plate (24) for attachment in the lower region of shaft walls (21) of a piston (10) for an internal combustion engine, said cover plate (24) has two opposite longitudinal sides (27) and two opposite free ends (25) and a recess (26) for the passage of a connecting rod, characterized in that between the recess (26) and at least one of the free ends (25) is provided a resiliently shaped, in cross-section U-shaped or V-shaped indentation (28).
10. Abdeckplatte nach Anspruch 9, dadurch gekennzeichnet, dass die Einformung (28) parallel zu dem ihr zugeordneten freien Ende (25) verläuft. 10. Cover plate according to claim 9, characterized in that the indentation (28) parallel to the free end (25) associated therewith.
1 1. Abdeckplatte nach Anspruch 9, dadurch gekennzeichnet, dass die Abdeckplatte (24) an jeder ihrer Längsseiten (27) mindestens ein federelastisch ausgebildetes Rastelement (29) aufweist. 1 1. Cover plate according to claim 9, characterized in that the cover plate (24) on each of its longitudinal sides (27) has at least one resiliently formed locking element (29).
12. Abdeckplatte nach Anspruch 9, dadurch gekennzeichnet, dass die Abdeckplatte (24) aus einem federelastischen Werkstoff hergestellt ist. 12. Cover plate according to claim 9, characterized in that the cover plate (24) is made of a resilient material.
13. Abdeckplatte nach Anspruch 9, dadurch gekennzeichnet, dass im Bereich eines freien Endes (25) eine Aussparung (31 ) vorgesehen ist. Abdeckplatte nach Anspruch 9, dadurch gekennzeichnet, dass die Abdeckplatte (24) mindest bereichsweise entlang ihrer Längsseiten (27) gewölbt ausgebildet ist. 13. Covering plate according to claim 9, characterized in that in the region of a free end (25) has a recess (31) is provided. Cover plate according to claim 9, characterized in that the cover plate (24) at least partially curved along their longitudinal sides (27) is formed.
EP14799669.8A 2013-10-30 2014-10-28 Piston for an internal combustion engine and cover plate for a piston Active EP3063382B1 (en)

Applications Claiming Priority (2)

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DE201310018249 DE102013018249A1 (en) 2013-10-30 2013-10-30 Piston for an internal combustion engine and cover plate for a piston
PCT/EP2014/002901 WO2015062719A1 (en) 2013-10-30 2014-10-28 Piston for an internal combustion engine and cover plate for a piston

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EP3063382A1 true EP3063382A1 (en) 2016-09-07
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EP (1) EP3063382B1 (en)
JP (1) JP2016536513A (en)
CN (1) CN105849379B (en)
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WO (1) WO2015062719A1 (en)

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DE102015218430A1 (en) 2015-09-25 2017-03-30 Mahle International Gmbh Piston for an internal combustion engine

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US1995746A (en) * 1923-02-07 1935-03-26 Bohn Aluminium & Brass Corp Piston
US4506632A (en) * 1983-07-28 1985-03-26 Toyota Jidosha Kabushiki Kaisha Piston assembly with cooling lubricant reservoir defining member engaged to piston pin mounting bosses
JPS60153453A (en) * 1984-01-24 1985-08-12 Toyota Motor Corp Piston for internal-combustion engine
US4867119A (en) * 1988-10-21 1989-09-19 Caterpillar Inc. Engine piston assembly and forged piston member therefor having a cooling recess
DE4110306A1 (en) 1990-09-20 1992-03-26 Mahle Gmbh SUBMERSIBLE ALLOY PISTON FOR OTTO ENGINES
DE4208037C2 (en) 1992-03-13 1998-03-26 Mahle Gmbh Multi-part, cooled piston for internal combustion engines
DE19522756A1 (en) 1995-06-27 1997-01-02 Kolbenschmidt Ag Reciprocating piston for IC engine
AT1919U1 (en) 1996-08-06 1998-01-26 Avl Verbrennungskraft Messtech INTERNAL COMBUSTION ENGINE
US6701875B2 (en) * 2002-05-31 2004-03-09 Cummins Inc. Internal combustion engine with piston cooling system and piston therefor
DE10346822A1 (en) * 2003-10-06 2005-04-21 Mahle Gmbh Piston for an internal combustion engine
JP2007211694A (en) * 2006-02-09 2007-08-23 Honda Motor Co Ltd Piston for internal combustion engine
US8828072B2 (en) 2010-07-20 2014-09-09 Cook Medical Technologies Llc Extendable flushing system
DE102011013139A1 (en) * 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine

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WO2015062719A1 (en) 2015-05-07
US10400657B2 (en) 2019-09-03
CN105849379B (en) 2019-09-20
EP3063382B1 (en) 2020-09-30
CN105849379A (en) 2016-08-10
JP2016536513A (en) 2016-11-24
US20160298523A1 (en) 2016-10-13

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