EP2142323B1 - Casting core for forming a cooling channel in a piston produced by casting - Google Patents

Casting core for forming a cooling channel in a piston produced by casting Download PDF

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Publication number
EP2142323B1
EP2142323B1 EP08758029A EP08758029A EP2142323B1 EP 2142323 B1 EP2142323 B1 EP 2142323B1 EP 08758029 A EP08758029 A EP 08758029A EP 08758029 A EP08758029 A EP 08758029A EP 2142323 B1 EP2142323 B1 EP 2142323B1
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EP
European Patent Office
Prior art keywords
piston
casting core
region
casting
cooling channel
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Not-in-force
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EP08758029A
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German (de)
French (fr)
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EP2142323A1 (en
Inventor
Helmut Kollotzek
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Mahle International GmbH
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Mahle International GmbH
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Publication of EP2142323A1 publication Critical patent/EP2142323A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • 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 invention relates to a casting core for forming a cooling channel in a piston produced by casting according to the preamble of claim 1.
  • a water-soluble salt core for forming a cooling channel in a cast piston for an internal combustion engine which is annular and has a region lying parallel to the piston axis, which forms the oil drain of the cooling channel and passes over a quarter-circle Kembiegung in the annular part of the cooling channel.
  • the salt core has a region arranged parallel to the piston axis, which forms the oil inlet of the cooling channel, wherein the salt core on the opposite side of this region has a notch for forming a tapered in the direction of the injected oil jet beam splitter.
  • the beam splitter has the function of dividing the oil jet into the halves of the cooling channel lying on both sides,
  • the division of the cooling oil into the two cooling channel halves depends both on the position of the piston relative to an oil jet that ejects the oil jet and on transverse accelerations experienced by the jet of oil due to movements of the engine equipped with the piston.
  • Fig. 1 shows a perspective view of a half-cut piston 1 for an internal combustion engine, which is produced by casting, wherein a casting core 2 made of a releasable material is poured with.
  • a casting core 2 made of a releasable material is poured with.
  • the G demkem 2 completely drawn, which is annular and arranged near the piston head 3 in the radially outer region of the piston 1.
  • the piston 1 can be made of aluminum or cast iron, while the soluble G discernkem 2 may consist of salt or sand, so that the casting core 2 can be washed out after the casting of the piston 1 with water or other suitable liquid from the piston 1 ,
  • the piston 1 is provided with a molded into the piston head 3 combustion bowl 4 and radially outboard near the piston with a ring portion 5, wherein the piston bottom 3 nearest groove 6 has an existing example of Niresist ring carrier 20 for a compression ring, not shown in the drawing.
  • the piston 1 has on the side facing away from the piston head 3 side of the piston 1 also two opposing pin bosses 7, 8, each with a pin bore 9, 10 and also the pin bosses 7, 8 interconnecting and integrally formed on the piston head 3 shaft elements, of which the representation of the piston 1 according to Fig. 1 only the shaft member 11 is visible.
  • the in Fig. 1 shown piston 1 is cut open so that the inlet opening 12 formed by the core 2 and main drain openings 13 of the cooling channel can be seen.
  • Fig. 2 is shown that the G confusekem 2 both in the region of the inlet opening 12 as well as in the region of the main drain opening 13 short portions 14, 15, which have at least approximately the same cross-sectional diameter, and each pass over a quarter-circular Kembiegung 17, 18 in the annular part of the casting core 2.
  • the region 14, which forms the inlet opening 12, at least approximately parallel to the piston axis 16.
  • the two regions 14 and 15 of the casting core 2 are arranged at a small distance from each other, in the present embodiment, approximately the cross-sectional diameter of the region 14 or 15 but maximum the double cross-sectional diameter of the range 14 or 15 corresponds.
  • the second region 14 opens into that end of the casting core 2, which forms the inlet opening 12 of the cooling channel.
  • the casting core 2 can have a further Kembiegung 19 over which the piston axis 16 parallel to the first region 15 of the G collectkemes 2 merges into the part of the G collectkemes 2, which forms the main drain opening 13, which in this case is aligned in that the cooling oil emerging therefrom, such as Fig. 1 reveals, in the direction of one in the Fig. 1 not shown piston pin splashes.
  • the cooling oil after cooling the piston 1 can be used to cool the bolt of the piston 1, and to lubricate the small connecting rod eye of a connecting rod connected to the piston.
  • the shape of the G confusekemes 2 in the region of the inlet opening 12 and in the region of the main drain opening 13 with the parallel to the piston axis 16 lying areas 14 and 15 and with the Kembiegept 17 to 19 has the advantage that cooling oil regardless of the position of the piston 1 of a
  • arranged in the crankshaft oil spray nozzle can be injected under high pressure into the oil inlet 12 formed by the casting core 2, wherein the oil spray nozzle is arranged so that it squirts the cooling oil parallel to the piston axis 16 and thereby injects into the inlet opening 12.
  • the oil then passes through the part of the cooling channel formed by the core bend 17 with little flow resistance in the annular part of the oil passage, passes through this quickly, and passes through the parts formed by the core bends 18 and 19 of the cooling channel with low flow resistance to the main drain opening 13, so that a large oil throughput is guaranteed, which leads to a comparison with the prior art improved cooling of the piston 1.
  • FIG. 3 illustrated embodiment of a casting core 21 has in comparison to the casting core 2 according to Fig. 2 a center region 26 facing away from the piston head 3, which forms a central discharge opening 22, and which is arranged on the side of the casting core 21 opposite the regions 14 and 15 'for the feed opening 12 and for the main drain opening 13.
  • the cross section of the entire casting core 21 has an oval shape whose ovality is in the direction of the piston axis 16.
  • the cooling channel formed by G confusekem 21 has the advantage that it opposes because of the additional, central drain opening 22 and because of in the direction of the first region 15 'increasing cross section of the introduced into the inlet opening 12 cooling oil a very low flow resistance, thereby reducing the amount of the cooling channel guided cooling oil continues to increase and the cooling of the piston 1 is improved.
  • the inlet opening 24 is formed oval-shaped, wherein the ovality is perpendicular to the piston radius 25.
  • This has the advantage that the arranged in the crankshaft oil spray nozzle, with the help of the cooling channel piston, the cooling oil is supplied, must not be aligned so that it squirts oil exclusively parallel to the piston axis 16.
  • the cooling oil can be obliquely, that is, injected at an acute angle to the piston axis 16 in the direction of inlet opening 24, wherein the oil spray nozzle must be aligned such that the oil jet, the inlet opening 24 regardless of the Position of the piston 1 between the top and bottom dead center hits.

Description

Die Erfindung betrifft einen Gießkem zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben nach dem Oberbegriff des Anspruches 1.The invention relates to a casting core for forming a cooling channel in a piston produced by casting according to the preamble of claim 1.

Aus der japanischen Patentanmeldung mit der Publikationsnummer JP 2006090159 ist ein wasserlöslicher Salzkern zur Bildung eines Kühlkanals in einem gegossenen Kolben für einen Verbrennungsmotor bekannt, der ringförmig ausgebildet ist und einen parallel zur Kolbenachse liegenden Bereich aufweist, der den Ölablauf des Kühlkanals bildet und über eine viertelkreisförmige Kembiegung in den ringförmigen Teil des Kühlkanals übergeht. Weiterhin weist der Salzkern einen parallel zur Kolbenachse angeordneten Bereich auf, der den Ölzulauf des Kühlkanals bildet, wobei der Salzkern auf der diesem Bereich gegenüberliegenden Seite eine Kerbe zur Bildung eines in Richtung des eingespritzten Ölstrahles konisch zulaufenden Strahlteilers aufweist. Der Strahlteiler hat die Funktion, den Ölstrahl in die beidseitig hiervon liegenden Hälften des Kühlkanals aufzuteilen,From the Japanese patent application with the publication number JP 2006090159 a water-soluble salt core for forming a cooling channel in a cast piston for an internal combustion engine is known, which is annular and has a region lying parallel to the piston axis, which forms the oil drain of the cooling channel and passes over a quarter-circle Kembiegung in the annular part of the cooling channel. Furthermore, the salt core has a region arranged parallel to the piston axis, which forms the oil inlet of the cooling channel, wherein the salt core on the opposite side of this region has a notch for forming a tapered in the direction of the injected oil jet beam splitter. The beam splitter has the function of dividing the oil jet into the halves of the cooling channel lying on both sides,

Aus der japanischen Patentanmeldung mit der Publikationsnummer JP 2006090158 ist ein Kolben für einen Verbrennungsmotor bekannt, der einen mittels eines Satzkerns herstellbaren Kühlkanal aufweist. Auch dieser Kühlkanal weist auf der der Ölzulauföffnung gegenüberliegenden Seite des Kühlkanals einen Strahlteiler auf, der den Ölstrahl in die beidseitig hiervon liegenden Hälften des Kühlkanals aufteilt.From the Japanese patent application with the publication number JP 2006090158 a piston for an internal combustion engine is known, which has a producible by means of a sentence core cooling channel. Also, this cooling channel has on the opposite side of the oil inlet opening of the cooling channel to a beam splitter, which divides the oil jet in the both sides thereof lying halves of the cooling channel.

Hierbei hängt die Aufteilung des Kühlöls in die beiden Kühlkanathälften sowohl von der Position des Kolbens gegenüber einer den Ölstrahl abspritzenden Öldüse als auch von Querbeschleunigungen ab, die der Ölstrahl aufgrund von Bewegungen des mit dem Kolben ausgerüsteten Motors erfährt. Hieraus ergibt sich der Nachteil, dass die Menge des Kühlöles, das in die beidseitig des Strahlteilers liegenden Hälften des Kühlkanals eingeleiteten wird, großen Schwankungen unterliegt, woraus sich Temperaturprobleme für den Kolben ergeben können, die zu einer Beschädigung des mit dem Kolben ausgestatteten Motors führen können.In this case, the division of the cooling oil into the two cooling channel halves depends both on the position of the piston relative to an oil jet that ejects the oil jet and on transverse accelerations experienced by the jet of oil due to movements of the engine equipped with the piston. This results in the disadvantage that the amount of cooling oil, which is introduced into the lying on both sides of the beam splitter halves of the cooling channel is subject to great fluctuations, which can result in temperature problems for the piston, which can lead to damage of the engine equipped with the piston ,

Diesen Nachteil des Standes der Technik zu vermeiden, ist Aufgabe der Erfindung. Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.To avoid this disadvantage of the prior art is an object of the invention. This problem is solved with the features in the characterizing part of the main claim. Advantageous embodiments of the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen

Fig. 1
eine perspektivische Darstellung eines halb aufgeschnittenen, im Gießverfahren hergestellten Kolbens mit dem erfindungsgemäßen, löslichen Gießkern zur Bildung eines Kühlkanals,
Fig. 2
den löslichen Gießkem gemäß der Erfindung in perspektivischer Darstellung, bevor er in eine Gießform für den Kolben eingelegt wird,
Fig. 3
eine Ausgestaltung des Gießkerns mit zwei Ölablauföffnungen und einem in Richtung der Hauptablauföffnung zunehmendem Querschnitt und
Fig. 4
eine weitere Ausgestaltung des Gießkerns mit ovaler Zulauföffnung.
An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1
3 a perspective view of a half-cut piston produced by the casting process with the soluble casting core according to the invention for forming a cooling channel,
Fig. 2
the soluble Gießkem according to the invention in a perspective view, before being inserted into a mold for the piston,
Fig. 3
an embodiment of the casting core with two oil drain holes and an increasing in the direction of the main drain opening cross-section and
Fig. 4
a further embodiment of the casting core with oval inlet opening.

Fig. 1 zeigt in perspektivischer Darstellung einen halbaufgeschnittenen Kolben 1 für einen Verbrennungsmotor, der im Gießverfahren hergestellt wird, wobei ein aus einem auslösbaren Material hergestellter Gießkem 2 mit eingegossen wird. In Fig. 1 ist der Gießkem 2 vollständig eingezeichnet, der ringförmig ausgebildet und nahe dem Kolbenboden 3 im radial äußeren Bereich des Kolbens 1 angeordnet ist. Hergestellt werden kann der Kolben 1 aus Aluminium oder aus Gusseisen, während der lösliche Gießkem 2 aus Salz oder aus Sand bestehen kann, sodass der Gießkern 2 nach dem Gießen des Kolbens 1 mit Wasser oder mit einer anderen geeigneten Flüssigkeit aus dem Kolben 1 ausgewaschen werden kann. Fig. 1 shows a perspective view of a half-cut piston 1 for an internal combustion engine, which is produced by casting, wherein a casting core 2 made of a releasable material is poured with. In Fig. 1 is the Gießkem 2 completely drawn, which is annular and arranged near the piston head 3 in the radially outer region of the piston 1. The piston 1 can be made of aluminum or cast iron, while the soluble Gießkem 2 may consist of salt or sand, so that the casting core 2 can be washed out after the casting of the piston 1 with water or other suitable liquid from the piston 1 ,

Der Kolben 1 ist versehen mit einer in den Kolbenboden 3 eingeformte Verbrennungsmulde 4 und radial außen in Kolbenbodennähe mit einer Ringpartie 5, wobei die dem Kolbenboden 3 nächstliegende Nut 6 einen beispielsweise aus Niresist bestehenden Ringträger 20 für einen in der Zeichnung nicht dargestellten Verdichtungsring aufweist. Der Kolben 1 weist auf der dem Kolbenboden 3 abgewandten Seite des Kolbens 1 zudem zwei einander gegenüberliegende Bolzennaben 7, 8 mit je einer Bolzenbohrung 9, 10 und außerdem die Bolzennaben 7, 8 miteinander verbindende und an den Kolbenboden 3 angeformte Schaftelemente auf, von denen in der Darstellung des Kolbens 1 gemäß Fig. 1 nur das Schaftelement 11 sichtbar ist.
Der in Fig. 1 dargestellte Kolben 1 ist so aufgeschnitten, dass die vom Gießkern 2 gebildeten Zulauföffnung 12 und Hauptablauföffnungen 13 des Kühlkanals erkennbar sind. In Fig. 2 ist dargestellt, dass der Gießkem 2 sowohl im Bereich der Zulauföffnung 12 als auch im Bereich der Hauptablauföffnung 13 kurze Bereiche 14, 15 aufweist, die zumindest annähernd gleiche Querschnittsdurchmesser aufweisen, und die jeweils über eine viertelkreisförmige Kembiegung 17, 18 in den ringförmigen Teil des Gießkemes 2 übergehen. Hierbei liegt der Bereich 14, der die Zulauföffnung 12 bildet, zumindest annähernd parallel zur Kolbenachse 16. Die beiden Bereiche 14 und 15 des Gießkerns 2 sind in einem geringen Abstand voneinander angeordnet, der im vorliegenden Ausführungsbeispiel näherungsweise dem Querschnittsdurchmesser des Bereiches 14 oder 15 maximal aber dem zweifachen Querschnittsdurchmesser des Bereiches 14 oder 15 entspricht. Der zweite Bereich 14 mündet hierbei in dasjenige Ende des Gießkernes 2, das die Zulauföffnung 12 des Kühlkanals bildet.The piston 1 is provided with a molded into the piston head 3 combustion bowl 4 and radially outboard near the piston with a ring portion 5, wherein the piston bottom 3 nearest groove 6 has an existing example of Niresist ring carrier 20 for a compression ring, not shown in the drawing. The piston 1 has on the side facing away from the piston head 3 side of the piston 1 also two opposing pin bosses 7, 8, each with a pin bore 9, 10 and also the pin bosses 7, 8 interconnecting and integrally formed on the piston head 3 shaft elements, of which the representation of the piston 1 according to Fig. 1 only the shaft member 11 is visible.
The in Fig. 1 shown piston 1 is cut open so that the inlet opening 12 formed by the core 2 and main drain openings 13 of the cooling channel can be seen. In Fig. 2 is shown that the Gießkem 2 both in the region of the inlet opening 12 as well as in the region of the main drain opening 13 short portions 14, 15, which have at least approximately the same cross-sectional diameter, and each pass over a quarter-circular Kembiegung 17, 18 in the annular part of the casting core 2. Here, the region 14, which forms the inlet opening 12, at least approximately parallel to the piston axis 16. The two regions 14 and 15 of the casting core 2 are arranged at a small distance from each other, in the present embodiment, approximately the cross-sectional diameter of the region 14 or 15 but maximum the double cross-sectional diameter of the range 14 or 15 corresponds. The second region 14 opens into that end of the casting core 2, which forms the inlet opening 12 of the cooling channel.

Im Bereich der Hauptablauföffnung 13 des Kühlkanals kann der Gießkern 2 eine weitere Kembiegung 19 aufweisen, über die der zur Kolbenachse 16 parallel liegende erste Bereich 15 des Gießkemes 2 in den Teil des Gießkemes 2 übergeht, der die Hauptablauföffnung 13 bildet, die hierbei so ausgerichtet ist, dass das hieraus austretende Kühlöl, wie Fig. 1 erkennen lässt, in Richtung eines in der Fig. 1 nicht dargestellten Kolbenbolzens spritzt. Hierdurch kann das Kühlöl nach dem Kühlen des Kolbens 1 dazu verwendet werden, den Bolzen des Kolbens 1 zu kühlen, und das kleine Pleuelauge einer mit dem Kolben verbundenen Pleuelstange zu schmieren.In the region of the main drain opening 13 of the cooling channel, the casting core 2 can have a further Kembiegung 19 over which the piston axis 16 parallel to the first region 15 of the Gießkemes 2 merges into the part of the Gießkemes 2, which forms the main drain opening 13, which in this case is aligned in that the cooling oil emerging therefrom, such as Fig. 1 reveals, in the direction of one in the Fig. 1 not shown piston pin splashes. Thereby, the cooling oil after cooling the piston 1 can be used to cool the bolt of the piston 1, and to lubricate the small connecting rod eye of a connecting rod connected to the piston.

Hierbei hat die Form des Gießkemes 2 im Bereich der Zulauföffnung 12 und im Bereich der Hauptablauföffnung 13 mit den parallel zur Kolbenachse 16 liegenden Bereichen 14 und 15 und mit den Kembiegungen 17 bis 19 den Vorteil, dass Kühlöl unabhängig von der Position des Kolbens 1 von einer beispielweise im Bereich der Kurbelwelle angeordneten Ölspritzdüse unter hohem Druck in die vom Gießkern 2 gebildete Ölzulauföffnung 12 eingespritzt werden kann, wobei die Ölspritzdüse so angeordnet ist, dass sie das Kühlöl parallel zur Kolbenachse 16 abspritzt und dabei in die Zulauföffnung 12 einspritzt. Das Öl gelangt dann über den von der Kernbiegung 17 gebildeten Teil des Kühlkanals mit nur geringem Strömungswiderstand in den ringförmigen Teil des Ölkanals, durchläuft diesen schnell, und gelangt über die von den Kernbiegungen 18 und 19 gebildeten Teile des Kühlkanals mit geringem Strömungswiderstand zur Hauptablauföffnung 13, sodass hierdurch ein großer Öldurchsatz gewährleistet ist, der zu einer gegenüber dem Stand der Technik verbesserten Kühlung des Kolbens 1 führt.Here, the shape of the Gießkemes 2 in the region of the inlet opening 12 and in the region of the main drain opening 13 with the parallel to the piston axis 16 lying areas 14 and 15 and with the Kembiegungen 17 to 19 has the advantage that cooling oil regardless of the position of the piston 1 of a For example, arranged in the crankshaft oil spray nozzle can be injected under high pressure into the oil inlet 12 formed by the casting core 2, wherein the oil spray nozzle is arranged so that it squirts the cooling oil parallel to the piston axis 16 and thereby injects into the inlet opening 12. The oil then passes through the part of the cooling channel formed by the core bend 17 with little flow resistance in the annular part of the oil passage, passes through this quickly, and passes through the parts formed by the core bends 18 and 19 of the cooling channel with low flow resistance to the main drain opening 13, so that a large oil throughput is guaranteed, which leads to a comparison with the prior art improved cooling of the piston 1.

Außerdem hat der geringe Abstand zwischen den Teilen des Kühlkanals, die von den parallel zur Kolbenachse 16 liegenden Bereichen 14 und 15 des Gießkemes 2 gebildeten werden, den Vorteil, dass nur ein sehr geringer Teil des Kolbens 1 vom Kühlöl ungekühlt bleibt.In addition, the small distance between the parts of the cooling channel, which are formed by the lying parallel to the piston axis 16 areas 14 and 15 of the casting core 2, the advantage that only a very small part of the piston 1 remains uncooled by the cooling oil.

Das in Fig. 3 dargestellte Ausführungsbeispiel eines Gießkerns 21 weist im Vergleich zum Gießkem 2 gemäß Fig. 2 einen vom Kolbenboden 3 wegweisenden Mittenbereich 26 auf, der eine mittlere Ablauföffnung 22 bildet, und der auf der den Bereichen 14 und 15' für die Zulauföffnung 12 und für die Hauptablauföffnung 13 gegenüberliegenden Seite des Gießkerns 21 angeordnet ist. Darüber hinaus nimmt der Querschnitt des Gießkerns 21 ausgehend von dessen Mittenbereich 26 bis hin zu dessen die Hauptablauföffnung 13 bildenden Bereich ersten Bereich 15' zu. Hierbei weist der Querschnitt des gesamten Gießkerns 21 eine ovale Form auf, dessen Ovalität in Richtung der Kolbenachse 16 liegt. Der vom Gießkem 21 gebildete Kühlkanal hat den Vorteil, dass er wegen der zusätzlichen, mittleren Ablauföffnung 22 und wegen des in Richtung des ersten Bereiches 15' zunehmenden Querschnitts dem in die Zulauföffnung 12 eingeleiteten Kühlöl einen sehr geringen Strömungswiderstand entgegensetzt, sodass dadurch die Menge des durch den Kühlkanal geleiteten Kühlöles weiter zunimmt und die Kühlung des Kolbens 1 verbessert wird.This in Fig. 3 illustrated embodiment of a casting core 21 has in comparison to the casting core 2 according to Fig. 2 a center region 26 facing away from the piston head 3, which forms a central discharge opening 22, and which is arranged on the side of the casting core 21 opposite the regions 14 and 15 'for the feed opening 12 and for the main drain opening 13. In addition, the cross section of the casting core 21, starting from its center region 26 up to its region forming the main drain opening 13, increases in the first region 15 '. Here, the cross section of the entire casting core 21 has an oval shape whose ovality is in the direction of the piston axis 16. The cooling channel formed by Gießkem 21 has the advantage that it opposes because of the additional, central drain opening 22 and because of in the direction of the first region 15 'increasing cross section of the introduced into the inlet opening 12 cooling oil a very low flow resistance, thereby reducing the amount of the cooling channel guided cooling oil continues to increase and the cooling of the piston 1 is improved.

In Fig. 4 ist eine Ausgestaltung eines Gießkemes 23 dargestellt, dessen Zulauföffnung 24 ovalförmig ausgebildet ist, wobei deren Ovalität senkrecht zum Kolbenradius 25 liegt. Dies bringt den Vorteil mit sich, dass die im Bereich der Kurbelwelle angeordnete Ölspritzdüse, mit deren Hilfe dem Kühlkanalkolben das Kühlöl zugeführt wird, nicht so ausgerichtet sein muss, dass sie Öl ausschließlich parallel zur Kolbenachse 16 abspritzt. In Abhängigkeit des Ortes, wo die Ölspritzdüse montiert ist, kann das Kühlöl schräg, das heißt, in einem spitzen Winkel zur Kolbenachse 16 in Richtung Zulauföffnung 24 gespritzt werden, wobei die Ölspritzdüse derart ausgerichtet sein muss, dass der Ölstrahl die Zulauföffnung 24 unabhängig von der Stellung des Kolbens 1 zwischen dem oberen und dem unteren Totpunkt trifft.In Fig. 4 an embodiment of a Gießkemes 23 is shown, the inlet opening 24 is formed oval-shaped, wherein the ovality is perpendicular to the piston radius 25. This has the advantage that the arranged in the crankshaft oil spray nozzle, with the help of the cooling channel piston, the cooling oil is supplied, must not be aligned so that it squirts oil exclusively parallel to the piston axis 16. Depending on the location where the oil spray nozzle is mounted, the cooling oil can be obliquely, that is, injected at an acute angle to the piston axis 16 in the direction of inlet opening 24, wherein the oil spray nozzle must be aligned such that the oil jet, the inlet opening 24 regardless of the Position of the piston 1 between the top and bottom dead center hits.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kolbenpiston
22
Gießkemcasting core
33
Kolbenbodenpiston crown
44
Verbrennungsmuldecombustion bowl
55
Ringpartiering belt
66
Nutgroove
7, 87, 8
Bolzennabepin boss
9, 109, 10
Bolzenbohrungpin bore
1111
Schaftelementshaft element
1212
Zulauföffnunginlet opening
1313
HauptablauföffnungMain drain opening
1414
zweiter Bereich des Gießkerns 2second region of the casting core 2
1515
erster Bereich des Gießkerns 2first region of the casting core 2
15'15 '
erster Bereich des Gießkerns 23first region of the casting core 23
1616
Kolbenachsepiston axis
17,18,1917,18,19
KembiegungKembiegung
2020
RingträgerRingbearer
2121
Gießkemcasting core
2222
mittlere Ablauföffnungmiddle drain opening
2323
Gießkemcasting core
2424
Zulauföffnunginlet opening
2525
Kolbenradiuspiston radius
2626
Mittenbereich des Gießkerns 23Center region of the casting core 23

Claims (5)

  1. A soluble casting core (2, 21, 23) in the shape of a pitch circle to form a cooling channel for receiving cooling oil, the cooling channel being arranged in a piston (1) produced by casting close to a piston base (3), and the casting core (2, 21, 23) merging at one end via a core bend (18) in the form of a quarter circle into a first region (15, 15'), which forms a main outflow opening (13) of the cooling channel, and is arranged parallel to an axis (16) that lies perpendicular to the plane formed by the pitch circle of the casting core (2, 21, 23),
    characterized in that the casting core (2, 21, 23) merges at its other end via a core bend (17) in the form of a quarter circle into a second region (14), which is arranged parallel to the first region (15, 15') and points in the same direction as the first region (15, 15'), the second region (14) forming the inflow opening (12, 24) of the cooling channel.
  2. The casting core (2, 21, 23) according to Claim 1, characterized by a middle region (26), which is opposite to the regions (14, 15, 15') for the inflow opening (12, 24) and the main outflow opening (13) and points away from the piston floor, to form a middle outflow opening (22).
  3. The casting core (2) according to Claim 1 or 2, characterized in that the first and the second regions (14, 15) of the casting core (2) have equal cross-sectional diameter and are arranged at a distance from one another which corresponds at most to two times the cross-sectional diameter of one of the two regions (14, 15).
  4. The casting core (21, 23) according to Claim 2, characterized in that the cross-section of the casting core (21, 23) increases originating from the middle region (26) up to the first region (15').
  5. The casting core (2, 21, 23) according to one of the preceding claims, characterized in that the inflow opening (12, 24) is in the form of an oval, its ovality lying perpendicularly to the piston radius (25).
EP08758029A 2007-04-27 2008-04-25 Casting core for forming a cooling channel in a piston produced by casting Not-in-force EP2142323B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007019930 2007-04-27
DE102007044105A DE102007044105A1 (en) 2007-04-27 2007-09-15 Casting core for forming a cooling channel in a piston produced by casting
PCT/DE2008/000770 WO2008131754A1 (en) 2007-04-27 2008-04-25 Casting core for forming a cooling channel in a piston produced by casting

Publications (2)

Publication Number Publication Date
EP2142323A1 EP2142323A1 (en) 2010-01-13
EP2142323B1 true EP2142323B1 (en) 2012-10-03

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EP08758029A Not-in-force EP2142323B1 (en) 2007-04-27 2008-04-25 Casting core for forming a cooling channel in a piston produced by casting

Country Status (7)

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US (1) US8122935B2 (en)
EP (1) EP2142323B1 (en)
JP (1) JP5185995B2 (en)
CN (1) CN101668599B (en)
BR (1) BRPI0810852A2 (en)
DE (1) DE102007044105A1 (en)
WO (1) WO2008131754A1 (en)

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CN102151794B (en) * 2011-02-23 2013-10-23 江苏大学 Gravity casting method and device for piston
DE102011076455A1 (en) * 2011-05-25 2012-11-29 Mahle International Gmbh Casting core for forming a cooling channel in a piston
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DE102012217939A1 (en) * 2012-10-01 2014-04-03 Mahle International Gmbh Process for the production of cores for the casting production of workpieces
JP6050709B2 (en) * 2013-03-22 2016-12-21 日立オートモティブシステムズ株式会社 Piston for internal combustion engine
CN104353814B (en) * 2014-10-28 2016-08-24 山东滨州渤海活塞股份有限公司 Alumina fibre titan oxide particles strengthens interior cold ring-mounted piston blank manufacture method
US20180326477A1 (en) * 2015-11-19 2018-11-15 Ks Kolbenschmidt Gmbh Cast Inflow And Outflow Openings For Cast-Steel And Cast Iron Pistons
CN107191287A (en) * 2017-06-06 2017-09-22 湖南江滨机器（集团）有限责任公司 A kind of piston and method for making piston
CN109732045A (en) * 2019-01-22 2019-05-10 共享智能铸造产业创新中心有限公司 A kind of type core and its manufacturing method and application method
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Also Published As

Publication number Publication date
JP2010525221A (en) 2010-07-22
DE102007044105A1 (en) 2008-10-30
EP2142323A1 (en) 2010-01-13
BRPI0810852A2 (en) 2014-10-29
US8122935B2 (en) 2012-02-28
CN101668599A (en) 2010-03-10
JP5185995B2 (en) 2013-04-17
US20100163203A1 (en) 2010-07-01
CN101668599B (en) 2013-02-13
WO2008131754A1 (en) 2008-11-06

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