EP2113319B1 - Foundry core to construct a cooling channel - Google Patents

Foundry core to construct a cooling channel Download PDF

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Publication number
EP2113319B1
EP2113319B1 EP09005283A EP09005283A EP2113319B1 EP 2113319 B1 EP2113319 B1 EP 2113319B1 EP 09005283 A EP09005283 A EP 09005283A EP 09005283 A EP09005283 A EP 09005283A EP 2113319 B1 EP2113319 B1 EP 2113319B1
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EP
European Patent Office
Prior art keywords
integral formation
piston
casting core
cooling channel
oil
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Not-in-force
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EP09005283A
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German (de)
French (fr)
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EP2113319A3 (en
EP2113319A2 (en
Inventor
Helmut Kollotzek
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Mahle International GmbH
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Mahle International GmbH
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Publication of EP2113319A3 publication Critical patent/EP2113319A3/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
    • B22C9/105—Salt 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
    • 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 according to the preamble of claim 1.
  • Fig. 1 is a piston 1 with a piston head 2, with a integrally formed via a land 3 to the piston crown 2 ring section 4, with a connected to the ring section 4 shaft member 5 and with two pin bosses 6 and 7, on the one hand to the shaft member 5 and on the other hand with the ring section 4 (and, as in Fig. 1 not shown, are connected via a respective hub support with the piston head 2).
  • the piston 1 also has a molded into the piston head 2 combustion bowl 29.
  • Fig. 1 Is marked in Fig. 1 also a cooling channel 8, which is arranged in piston crown near, radially outside, circumferentially and forms an open ring.
  • the cooling channel 8 has at its beginning 12 an oil inlet 9, and in the region of its end 13 a first oil drain 10.
  • a second oil drain 11 is arranged on the oil inlet 9 and the first oil drain 10 opposite side of the piston 1.
  • the oil inlet 9 and the two oil drains 10 and 11 are aligned in the direction of the piston interior.
  • a bottom view of the piston 1 shows the oil inlet 9 near the pin boss 7 (in the region of the hub support) and the first oil drain 10 near the pin boss 6 (in the region of the hub support), wherein the oil inlet 9 and the first oil drain 10 on that Piston side are arranged, on which also the shaft element 5 is located.
  • the shaft element 5 can lie on the pressure side or on the counterpressure side of the piston 1.
  • the cooling channel 8 is viewed between the end 13 and the first oil drain 10 from the side (see Fig. 1 ) formed as a tapered towards the end 13 extension 14.
  • the piston bottom side cover 15 of the extension 14 is parallel to the piston head 2, and the bottom 16 facing away from the piston bottom is inclined at an angle to the piston head 2.
  • Fig. 1 are also the holes 30, 31 and 32 shown, which are introduced into the finished piston 1 to connect the oil inlet 9 and first and second oil drain 10 and 11 with the piston interior.
  • Fig. 2 the bottom view of the piston 1, is shown in addition to the pin bosses 6 and 7, the oil inlet 9, the first oil drain 10 and the second oil drain 11 of the cooling channel 8 with its extension 14.
  • Fig. 3 shows a casting core 17 in the form of an open ring, with the aid of the cooling channel 8 is made, and which consists of a solvable by means of water or by means of a special liquid material.
  • the casting core 17 consists of water-soluble salt or of sand, wherein a sand casting core 17 is given by means of a water-soluble binder for the casting sufficiently stable form.
  • the casting core 17 has in the region of its end 21 a first molding 18 for forming the first oil drain 10.
  • a second Anformung 19 for forming the second oil drain 11 is disposed on the opposite side of the end 21 of the casting core 17.
  • a third Anformung 20 between the first Anformung 18 and the end 21 of the casting core 17 with towards the end 21 of the casting core 17 towards tapered shape is used in casting the piston 1 of the formation of the extension 14 of the cooling channel 8 and has a top 25 which is parallel to a lying perpendicular to the axis of symmetry 26 of the casting core 17 level, and a bottom 27, which extends from the first Anformung 18 to the end 21 of the casting core 17 obliquely to this plane perpendicular to the axis of symmetry 26 level.
  • a fourth Anformung 24 is arranged over a quarter-circle-shaped core bend 23, which serves for the formation of the oil inlet 9 during casting of the piston 1.
  • the first, second and fourth Anformung 18, 19 and 24 are in this case on the underside of the casting core 17 and parallel to the axis of symmetry 26 of the casting core 17th
  • the casting core 17 When casting the piston 1, the casting core 17 is inserted into the casting mold and fixed at a certain distance from the bottom of the casting mold, whereby the thickness of the intended between the cooling channel 8 and piston crown 2 piston material is determined. After casting, the 1st, 2nd and 4th Anformung 18, 19 and 24 are drilled to form the ⁇ lzuhne- and ⁇ lablmann füre from the inner side of the piston forth and through these holes 30, 31, 32 ( Fig. 1 ) of the casting core 17 washed out with the aid of a suitable liquid. This liquid may be water if, as stated above, the casting core 17 is made of salt or of sand with a water-soluble binder.
  • the casting core 17 with its fourth, parallel to the axis of symmetry 26 Anformung 24 to form the oil inlet 9, with the adjoining, quarter-circular core bend 23 over which the 4th Anformung merges into the remaining casting core 17, and with its 3rd Anformung 20 to form the extension 14 of the cooling channel 8 results in the context of casting the piston 1 a cooling channel 8, which lies parallel to the axis of symmetry 26 oil inlet 9 regardless of the position of the piston 1 of a parallel to the axis of symmetry 26 of the cooling channel 8, the axis 33rd corresponds to the piston 1, directed oil jet can be taken well, so that this results in a very good degree of capture (feed efficiency of the cooling oil to the piston).
  • the quarter-circle-shaped core bend 23 of the casting core 17 leads at the cooling channel 8 to an equally shaped channel transition 28 (FIG. Fig. 1 ) between oil inlet 9 and the rest of the cooling channel 8.
  • the oil injected into the oil inlet 9 is deflected in a fluidically ideal manner and passed through the cooling channel 8 with increased flow velocity.
  • the inclined bottom 16 of the extension 14 then causes an improved flow back of the oil to then completely flow out of the first oil drain 10.
  • the created by the second Anformung 19 of the casting core 17 second oil drain 11 is optional and is formed only in the case in the cooling channel 8 that due to the cooling oil supply (volume flow, beam quality), the amount of oil in the cooling channel 8 is too large and thus a Flow obstruction or obstruction of the shaker effect of the cooling oil results. Since this would impair the cooling efficiency, a portion of the cooling oil is discharged through the second oil drain 11, so that the remainder of the oil can optimally cool the piston area between the second oil drain 11 and the end 13 of the cooling channel 8.
  • a larger distance between the oil inlet 9 and the first oil drain 10 is realized by means of a correspondingly shaped casting core 17, wherein ideally the oil inlet 9 and the first oil drain 10 in the hub supports of the pin bosses 6 and 7 are formed in the underside of the piston crown 2 because here are the necessary for the oil inlet 9 and the first oil drain 10 holes 30, 31 are in a by the lateral forces less highly loaded area of the piston 1, and the corresponding holes 30, 31 in connection with the hub connections constructive and strength side Optimized to be realized.
  • the piston In engine operation, the piston is deformed on the one hand under the action of the gas pressure in the combustion chamber, wherein the piston head 2 is deflected inwardly.
  • the piston Because of the very high temperatures prevailing in the piston, the piston experiences a further deformation, whereby the piston crown bulges out and the diameter of the piston crown is increased.
  • act on the pressure and the counter-pressure side of the piston skirt in engine operation very large forces, which in particular deforms the lower, open end of the piston skirt oval.

Description

Die Erfindung betrifft einen Gießkern zur Bildung eines Kühlkanals nach dem Oberbegriff des Anspruches 1.The invention relates to a casting core for forming a cooling channel according to the preamble of claim 1.

Aus der Deutschen Patentanmeldung mit dem Aktenzeichen 10 2007 044 105.5 ist ein löslicher Gießkern zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben bekannt, wobei der Gießkern eine Anformung zur Bildung eines Ölzulaufes und eine weitere Anformung zur Bildung einer Ölablaufes des Kühlkanals aufweist. Hierbei ergibt sich das Problem, das der Kolben im Motorbetrieb auf Grund des Gasdruckes im Verbrennungsraum, auf Grund der sehr hohen Temperaturen, die im Verbrennungsraum vorherrschen, und auf Grund der mechanischen Belastung der Druck- und der Gegendruckseite des Kolbens unterschiedliche Deformationen erfährt, die dazu führen, dass insbesondere der Bereich zwischen dem Ölzulauf und dem Ölablauf einer sehr großen Belastung ausgesetzt ist, sodass in diesem Bereich die Gefahr der Rissbildung besteht, wenn der Ölzulauf und der Ölablauf einen zu geringen Abstand voneinander aufweisen.From the German patent application with the file number 10 2007 044 105.5 a soluble casting core for forming a cooling channel in a piston produced by casting is known, wherein the casting core has a Anformung for forming an oil inlet and a further Anformung to form an oil drainage of the cooling channel. This results in the problem that the piston undergoes different deformations in engine operation due to the gas pressure in the combustion chamber, due to the very high temperatures prevailing in the combustion chamber, and due to the mechanical load of the pressure and the counter-pressure side of the piston, the lead that in particular the area between the oil inlet and the oil drain is exposed to a very large load, so there is a risk of cracking in this area when the oil inlet and the oil drain are too close together.

Dieses Problem zu vermeiden ist Aufgabe der Erfindung. Gelöst wird das Problem mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.To avoid this problem is the object of the invention. The 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
einen skizzenhaft dargestellten Kolben mit einem Kühlkanal hergestellt unter Verwendung des erfindungsgemäßen Gießkerns,
Fig. 2
eine Unteransicht des Kolbens gemäß Fig. 1, in der der Kühlkanal eingezeichnet ist, und
Fig. 3
eine Darstellung des erfindungsgemäßen Gießkernes zur Herstellung des Kühlkanals.
An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1
a sketched piston with a cooling channel produced using the casting core according to the invention,
Fig. 2
a bottom view of the piston according to Fig. 1 in which the cooling channel is located, and
Fig. 3
an illustration of the casting core according to the invention for the production of the cooling channel.

In Fig. 1 ist ein Kolben 1 mit einem Kolbenboden 2, mit einer über einen Feuersteg 3 an den Kolbenboden 2 angeformten Ringpartie 4, mit einem mit der Ringpartie 4 verbundenen Schaftelement 5 und mit zwei Bolzennaben 6 und 7 dargestellt, die einerseits mit dem Schaftelement 5 und andererseits mit der Ringpartie 4 (und, wie in Fig. 1 nicht dargestellt ist, über je eine Nabenabstützung mit dem Kolbenboden 2) verbunden sind. Der Kolben 1 weist zudem eine in den Kolbenboden 2 eingeformte Verbrennungsmulde 29 auf.In Fig. 1 is a piston 1 with a piston head 2, with a integrally formed via a land 3 to the piston crown 2 ring section 4, with a connected to the ring section 4 shaft member 5 and with two pin bosses 6 and 7, on the one hand to the shaft member 5 and on the other hand with the ring section 4 (and, as in Fig. 1 not shown, are connected via a respective hub support with the piston head 2). The piston 1 also has a molded into the piston head 2 combustion bowl 29.

Eingezeichnet ist in Fig. 1 auch ein Kühlkanal 8, der in Kolbenbodennähe, radial außen, umlaufend angeordnet ist und einen offenen Ring bildet. Der Kühlkanal 8 weist an seinem Anfang 12 einen Ölzulauf 9, und im Bereich seines Endes 13 einen erste Ölablauf 10 auf. Auf der dem Ölzulauf 9 und dem ersten Ölablauf 10 gegenüberliegenden Seite des Kolbens 1 ist ein zweiter Ölablauf 11 angeordnet. Der Ölzulauf 9 und die beiden Ölabläufe 10 und 11 sind in Richtung Kolbeninnenraum ausgerichtet. Hierbei sind, wie insbesondere Fig. 2, eine Unteransicht des Kolbens 1, zeigt, der Ölzulauf 9 nahe der Bolzennabe 7 (im Bereich deren Nabenabstützung) und der erste Ölablauf 10 nahe der Bolzennabe 6 (im Bereich deren Nabenabstützung) angeordnet, wobei der Ölzulauf 9 und der erste Ölablauf 10 auf derjenigen Kolbenseite angeordnet sind, auf der sich auch das Schaftelement 5 befindet. Das Schaftelement 5 kann hierbei je nachdem, wie der Kolben 1 in einen Motor eingebaut ist, auf der Druckseite oder auf der Gegendruckseite des Kolbens 1 liegen.Is marked in Fig. 1 also a cooling channel 8, which is arranged in piston crown near, radially outside, circumferentially and forms an open ring. The cooling channel 8 has at its beginning 12 an oil inlet 9, and in the region of its end 13 a first oil drain 10. On the oil inlet 9 and the first oil drain 10 opposite side of the piston 1, a second oil drain 11 is arranged. The oil inlet 9 and the two oil drains 10 and 11 are aligned in the direction of the piston interior. Here are, in particular Fig. 2 , A bottom view of the piston 1, shows the oil inlet 9 near the pin boss 7 (in the region of the hub support) and the first oil drain 10 near the pin boss 6 (in the region of the hub support), wherein the oil inlet 9 and the first oil drain 10 on that Piston side are arranged, on which also the shaft element 5 is located. Depending on how the piston 1 is installed in an engine, the shaft element 5 can lie on the pressure side or on the counterpressure side of the piston 1.

Der Kühlkanal 8 ist zwischen dessen Ende 13 und dem ersten Ölablauf 10 von der Seite betrachtet (siehe Fig. 1) als ein gegen das Ende 13 hin konisch zulaufender Fortsatz 14 ausgebildet. Die kolbenbodenseitige Decke 15 des Fortsatzes 14 liegt parallel zum Kolbenboden 2, und dessen kolbenbodenabgewandter Boden 16 ist schräg zum Kolbenboden 2 hin geneigt. In Fig. 1 sind auch die Bohrungen 30, 31 und 32 dargestellt, die in den fertigen Kolben 1 eingebracht sind, um den Ölzulauf 9 und ersten und zweiten Ölablauf 10 und 11 mit dem Kolbeninnenraum zu verbinden.The cooling channel 8 is viewed between the end 13 and the first oil drain 10 from the side (see Fig. 1 ) formed as a tapered towards the end 13 extension 14. The piston bottom side cover 15 of the extension 14 is parallel to the piston head 2, and the bottom 16 facing away from the piston bottom is inclined at an angle to the piston head 2. In Fig. 1 are also the holes 30, 31 and 32 shown, which are introduced into the finished piston 1 to connect the oil inlet 9 and first and second oil drain 10 and 11 with the piston interior.

In Fig. 2, der Unteransicht des Kolbens 1, ist neben den Bolzennaben 6 und 7, dem Ölzulauf 9, dem ersten Ölablauf 10 und dem zweiten Ölablauf 11 der Kühlkanal 8 mit dessen Fortsatz 14 eingezeichnet.In Fig. 2 , the bottom view of the piston 1, is shown in addition to the pin bosses 6 and 7, the oil inlet 9, the first oil drain 10 and the second oil drain 11 of the cooling channel 8 with its extension 14.

Fig. 3 zeigt einen Gießkern 17 in Form eines offenen Ringes, mit dessen Hilfe der Kühlkanal 8 hergestellt wird, und der aus einem mittels Wasser oder mittels einer Spezialflüssigkeit lösbarem Material besteht. Vorzugsweise besteht der Gießkern 17 aus wasserlöslichem Salz oder aus Sand, wobei einem aus Sand bestehenden Gießkern 17 mittels eines wasserlöslichen Binders eine für den Gießvorgang ausreichend stabile Form gegeben wird. Der Gießkern 17 weist im Bereich seines Endes 21 eine erste Anformung 18 zur Bildung des ersten Ölablaufes 10 auf. Eine zweite Anformung 19 zur Bildung des zweiten Ölablaufes 11 ist auf der dem Ende 21 gegenüberliegenden Seite des Gießkernes 17 angeordnet. Fig. 3 shows a casting core 17 in the form of an open ring, with the aid of the cooling channel 8 is made, and which consists of a solvable by means of water or by means of a special liquid material. Preferably, the casting core 17 consists of water-soluble salt or of sand, wherein a sand casting core 17 is given by means of a water-soluble binder for the casting sufficiently stable form. The casting core 17 has in the region of its end 21 a first molding 18 for forming the first oil drain 10. A second Anformung 19 for forming the second oil drain 11 is disposed on the opposite side of the end 21 of the casting core 17.

Eine dritte Anformung 20 zwischen der ersten Anformung 18 und dem Ende 21 des Gießkernes 17 mit gegen Ende 21 des Gießkernes 17 hin konisch zulaufender Form dient beim Gießen des Kolbens 1 der Ausbildung des Fortsatzes 14 des Kühlkanals 8 und weist eine Oberseite 25, die parallel zu einer senkrecht zur Symmetrieachse 26 des Gießkernes 17 liegenden Ebene liegt, und eine Unterseite 27 auf, die ausgehend von der ersten Anformung 18 bis zum Ende 21 des Gießkernes 17 schräg auf diese senkrecht zur Symmetrieachse 26 liegende Ebene hin zuläuft. Am Anfang 22 des Gießkerns 17 ist über eine viertelkreisförmige Kernbiegung 23 eine vierte Anformung 24 angeordnet, die beim Gießen des Kolbens 1 der Bildung des Ölzulaufes 9 dient. Die erste, zweite und vierte Anformung 18, 19 und 24 liegen hierbei auf der Unterseite des Gießkernes 17 und parallel zur Symmetrieachse 26 des Gießkernes 17.A third Anformung 20 between the first Anformung 18 and the end 21 of the casting core 17 with towards the end 21 of the casting core 17 towards tapered shape is used in casting the piston 1 of the formation of the extension 14 of the cooling channel 8 and has a top 25 which is parallel to a lying perpendicular to the axis of symmetry 26 of the casting core 17 level, and a bottom 27, which extends from the first Anformung 18 to the end 21 of the casting core 17 obliquely to this plane perpendicular to the axis of symmetry 26 level. At the beginning 22 of the casting core 17 a fourth Anformung 24 is arranged over a quarter-circle-shaped core bend 23, which serves for the formation of the oil inlet 9 during casting of the piston 1. The first, second and fourth Anformung 18, 19 and 24 are in this case on the underside of the casting core 17 and parallel to the axis of symmetry 26 of the casting core 17th

Beim Gießen des Kolbens 1 wird der Gießkern 17 in die Gussform eingelegt und in einem bestimmten Abstand vom Boden der Gussform fixiert, wodurch die Dicke des zwischen Kühlkanal 8 und Kolbenboden 2 vorgesehenen Kolbenmaterials bestimmt wird. Nach dem Guss werden zur Bildung der Ölzufluss- und Ölabflusskanäle von der Kolbeninnenseite her die 1., 2. und 4. Anformung 18, 19 und 24 angebohrt und über diese Bohrungen 30, 31, 32 (Fig. 1) der Gießkern 17 mit Hilfe einer geeigneten Flüssigkeit ausgewaschen. Diese Flüssigkeit kann Wasser sein, wenn, wie oben abgegeben, der Gießkern 17 aus Salz oder aus Sand mit einem wasserlöslichen Binder besteht.When casting the piston 1, the casting core 17 is inserted into the casting mold and fixed at a certain distance from the bottom of the casting mold, whereby the thickness of the intended between the cooling channel 8 and piston crown 2 piston material is determined. After casting, the 1st, 2nd and 4th Anformung 18, 19 and 24 are drilled to form the Ölzufluss- and Ölabflusskanäle from the inner side of the piston forth and through these holes 30, 31, 32 ( Fig. 1 ) of the casting core 17 washed out with the aid of a suitable liquid. This liquid may be water if, as stated above, the casting core 17 is made of salt or of sand with a water-soluble binder.

Der Gießkern 17 mit seiner 4., parallel zur Symmetrieachse 26 liegenden Anformung 24 zur Bildung des Ölzulaufes 9, mit der sich daran anschließenden, viertelkreisförmigen Kernbiegung 23, über die die 4. Anformung in den restlichen Gießkern 17 übergeht, und mit seiner 3. Anformung 20 zur Bildung des Fortsatzes 14 des Kühlkanals 8 ergibt in Rahmen des Gießens des Kolbens 1 einen Kühlkanal 8, dessen parallel zur Symmetrieachse 26 liegender Ölzulauf 9 unabhängig von der Position des Kolbens 1 von einem parallel zur Symmetrieachse 26 des Kühlkanals 8, die der Achse 33 des Kolbens 1 entspricht, gerichteten Ölstrahl gut getroffen werden kann, sodass sich hierdurch ein sehr guter Fanggrad (Zuführungswirkungsgrad des Kühlöls zum Kolben) ergibt.The casting core 17 with its fourth, parallel to the axis of symmetry 26 Anformung 24 to form the oil inlet 9, with the adjoining, quarter-circular core bend 23 over which the 4th Anformung merges into the remaining casting core 17, and with its 3rd Anformung 20 to form the extension 14 of the cooling channel 8 results in the context of casting the piston 1 a cooling channel 8, which lies parallel to the axis of symmetry 26 oil inlet 9 regardless of the position of the piston 1 of a parallel to the axis of symmetry 26 of the cooling channel 8, the axis 33rd corresponds to the piston 1, directed oil jet can be taken well, so that this results in a very good degree of capture (feed efficiency of the cooling oil to the piston).

Die viertelkreisförmige Kernbiegung 23 des Gießkerns 17 führt beim Kühlkanal 8 zu einem ebenso geformten Kanalübergang 28 (Fig. 1) zwischen Ölzulauf 9 und dem Rest des Kühlkanals 8. Hierdurch wird das in den Ölzulauf 9 eingespritzte Öl auf strömungstechnisch ideale Weise umgelenkt und mit erhöhter Strömungsgeschwindigkeit durch den Kühlkanal 8 geleitet.The quarter-circle-shaped core bend 23 of the casting core 17 leads at the cooling channel 8 to an equally shaped channel transition 28 (FIG. Fig. 1 ) between oil inlet 9 and the rest of the cooling channel 8. As a result, the oil injected into the oil inlet 9 is deflected in a fluidically ideal manner and passed through the cooling channel 8 with increased flow velocity.

Der mittels der 3. Anformung 20 des Gießkerns 17 hergestellte Fortsatz 14 des Kühlkanals 8 bewirkt, dass auch der vergrößerte Bereich zwischen dem Ölzulauf 9 und dem ersten Ölablauf 10 gut gekühlt wird, wobei im Motorbetrieb das Kühlöl wegen seiner erhöhten Strömungsgeschwindigkeit nur teilweise über den ersten Ölablauf 10 aus dem Kühlkanal 8 austritt und wegen seiner Massenträgheit zu einem großen Teil in den Fortsatz 14 weiterfließt, um diesen Kolbenbereich zwischen Ölzulauf 9 und 1. Ölablauf 10 zu kühlen. Der schräge Boden 16 des Fortsatzes 14 bewirkt dann ein verbessertes Zurückfließen des Öls, um anschließend vollständig aus dem 1. Ölablauf 10 auszufließen.The projection 14 of the cooling channel 8, which is produced by means of the third molding 20 of the casting core 17, causes the enlarged area between the oil inlet 9 and the first oil outlet 10 to be cooled well, with the cooling oil only partially over the first in engine operation due to its increased flow velocity Oil drain 10 exits the cooling channel 8 and continues to flow due to its inertia to a large extent in the extension 14 to cool this piston area between the oil inlet 9 and the first oil drain 10. The inclined bottom 16 of the extension 14 then causes an improved flow back of the oil to then completely flow out of the first oil drain 10.

Der von der zweiten Anformung 19 des Gießkerns 17 geschaffene 2. Ölablauf 11 ist optional und wird nur für den Fall in den Kühlkanal 8 eingeformt, dass auf Grund des Kühlölangebotes (Volumenstrom, Strahlqualität) die Ölmenge im Kühlkanal 8 zu groß wird und sich damit eine Strömungsbehinderung beziehungsweise eine Behinderung der Shakerwirkung des Kühlöls ergibt. Da sich hierdurch die Kühleffizienz verschlechtern würde, wird durch den 2. Ölablauf 11 ein Teil des Kühlöles ausgeleitet, sodass der verbleibende Rest des Öles den Kolbenbereich zwischen dem 2. Ölablauf 11 und dem Ende 13 des Kühlkanals 8 optimal kühlen kann.The created by the second Anformung 19 of the casting core 17 second oil drain 11 is optional and is formed only in the case in the cooling channel 8 that due to the cooling oil supply (volume flow, beam quality), the amount of oil in the cooling channel 8 is too large and thus a Flow obstruction or obstruction of the shaker effect of the cooling oil results. Since this would impair the cooling efficiency, a portion of the cooling oil is discharged through the second oil drain 11, so that the remainder of the oil can optimally cool the piston area between the second oil drain 11 and the end 13 of the cooling channel 8.

Hierbei wird mittels eines entsprechend gestalteten Gießkerns 17 ein größerer Abstand zwischen dem Ölzulauf 9 und dem ersten Ölablauf 10 realisiert, wobei idealerweise der Ölzulauf 9 und der 1. Ölablauf 10 im Bereich der Nabenabstützungen der Bolzennaben 6 und 7 in die Unterseite des Kolbenbodens 2 eingeformt werden, weil sich hier die für den Ölzulauf 9 und den 1. Ölablauf 10 erforderlichen Bohrungen 30, 31 in einem durch die Seitenkräfte weniger hoch belasteten Bereich des Kolbens 1 befinden, und sich die entsprechenden Bohrungen 30, 31 im Zusammenhang mit den Nabenanbindungen konstruktive und festigkeitsseitig optimiert verwirklich lassen.Here, a larger distance between the oil inlet 9 and the first oil drain 10 is realized by means of a correspondingly shaped casting core 17, wherein ideally the oil inlet 9 and the first oil drain 10 in the hub supports of the pin bosses 6 and 7 are formed in the underside of the piston crown 2 because here are the necessary for the oil inlet 9 and the first oil drain 10 holes 30, 31 are in a by the lateral forces less highly loaded area of the piston 1, and the corresponding holes 30, 31 in connection with the hub connections constructive and strength side Optimized to be realized.

Im Motorbetrieb wird der Kolben zum einen unter der Wirkung des Gasdrucks im Verbrennungsraum deformiert, wobei der Kolbenboden 2 nach innen durchgebogen wird. Zum anderen erfährt der Kolben wegen der hierbei im Kolben herrschenden, sehr hohen Temperaturen eine weitere Deformation, wobei der Kolbenboden ausgewölbt und der Durchmesser des Kolbenbodens vergrößert wird. Darüber hinaus wirken auf die Druck- und die Gegendruckseite des Kolbenschaftes im Motorbetrieb sehr große Kräfte, wodurch sich insbesondere das unterer, offene Ende des Kolbenschaftes oval verformt. Durch diese Verformungen des Kolbens 1 im Motorbetrieb wird insbesondere der Kolbenbereich zwischen dem Ölzulauf 9 und dem 1. Ölablauf 10 mechanisch sehr belastet. In der Praxis hat sich gezeigt, dass aus diesem Grund ein zu kleiner Steg zwischen dem Ölzulauf 9 und dem 1. Ölablauf 10, der sich ergibt, wenn der Ölzulauf 9 und der 1. Ölablauf 10 einen zu geringen Abstand voneinander aufweisen, zu Rissbildung und zum Brechen neigt. Eine Vergrößerung dieses Abstandes vergrößert hierbei die Menge des Kolbenmaterials und damit die Festigkeit des Bereiches zwischen dem Ölzulauf 9 und dem 1. Ölablauf 10, sodass der gesamte Kolben 1 einer größeren thermischen und mechanischen Belastung ausgesetzt werden kann.In engine operation, the piston is deformed on the one hand under the action of the gas pressure in the combustion chamber, wherein the piston head 2 is deflected inwardly. On the other hand, because of the very high temperatures prevailing in the piston, the piston experiences a further deformation, whereby the piston crown bulges out and the diameter of the piston crown is increased. In addition, act on the pressure and the counter-pressure side of the piston skirt in engine operation very large forces, which in particular deforms the lower, open end of the piston skirt oval. As a result of these deformations of the piston 1 during engine operation, in particular the piston area between the oil inlet 9 and the first oil outlet 10 is subjected to a great mechanical load. In practice, it has been found that for this reason too small a web between the oil inlet 9 and the first oil drain 10, which results when the oil inlet 9 and the first oil drain 10 are too close to each other, to cracking and tends to break. An increase in this distance increases the amount of piston material and thus the strength of the area between the oil inlet 9 and the first oil drain 10, so that the entire piston 1 can be exposed to a greater thermal and mechanical load.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kolbenpiston
22
Kolbenbodenpiston crown
33
Feuerstegtop land
44
Ringpartiering belt
55
Schaftelementshaft element
6, 76, 7
Bolzennabepin boss
88th
Kühlkanalcooling channel
99
Ölzulaufoil supply
1010
1. Ölablauf1. Oil drain
1111
2. Ölablauf2. Oil drain
1212
Anfang des Kühlkanals 8Beginning of the cooling channel 8
1313
Ende des Kühlkanals 8End of the cooling channel 8
1414
Fortsatz des Kühlkanals 8Extension of the cooling channel 8
1515
Decke des Fortsatzes 14Ceiling of the extension 14
1616
Boden des Fortsatzes 14Bottom of the extension 14
1717
Gießkerncasting core
1818
1. Anformung1. Anformung
1919
2. Anformung2. Anformung
2020
3. Anformung3. Formation
2121
Ende des Gießkerns 17End of the casting core 17
2222
Anfang des Gießkerns 17Beginning of the casting core 17
2323
viertelkreisförmige Kernbiegungquarter-circle-shaped core bend
2424
4. Anformung4. Forming
2525
Oberseite der 3. Anformung 20Top of the third Anformung 20
2626
Symmetrieachseaxis of symmetry
2727
Unterseite der 3. Anformung 20Bottom of the 3rd Anformung 20
2828
KanalübergangChannel transition
2929
Verbrennungsmuldecombustion bowl
30, 31, 3230, 31, 32
Bohrungdrilling
3333
Achse des Kolbens 1Axle of the piston 1

Claims (4)

  1. A soluble and open-ring shaped casting core (17) for forming a cooling channel (8) in a piston (1) produced by casting and comprising two piston-pin bosses (6, 7), which are integrally formed on the piston head (2) by way of a boss support In each case,
    - wherein the beginning (22) of the casting core (17) transitions via a quarter-circle shaped core bend (23) into a fourth integral formation (24), which is disposed at least approximately parallel to the symmetry axis (26) of the casting core (17), for forming an oil inlet (9) of the cooling channel (8), and
    - wherein the casting core (17), in the region of the end (21) thereof, comprises a first integral formation (18), which points in the same direction as the fourth integral formation (24), for forming a first oil outlet (10) In the region of the end (13) of the cooling channel (8),
    characterized In that
    - the first Integral formation (18) and the fourth integral formation (24) are disposed such that the oil inlet (9) formed by the fourth integral formation (24) can be disposed in the region of the boss support of one of the two piston-pin bosses (6, 7) and the first oil outlet (10) formed by the first Integral formation (18) can be disposed in the region of the boss support of the other of the two piston-pin bosses (7, 6), and the oil Inlet (9) and the first oil outlet (10) can be disposed either on the major thrust face or on the minor thrust face of the piston (1), and
    - a third, elongated integral formation (20) extending in the circumferential direction for forming a continuation (14) between the first oil outlet (10) and the end (13) of the cooling channel (8) is disposed between the first Integral formation (18) and the end (21) of the casting core (17).
  2. The casting core (17) according to claim 1, characterized in that the third Integral formation (20) has a shape that extends conically toward the end (21) of the casting core (17).
  3. The casting core (17) according to claim 1 or 2, characterized by a second integral formation (19), which is disposed on the side of the casting core (17) opposite the first integral formation (18) and the fourth integral formation (24) and points in the same direction as the fourth integral formation (24), for forming a second oil outlet (11) of the cooling channel (8).
  4. The casting core (17) according to any one of the claims 1 to 3, characterized in that the third integral formation (20) has a top side (25) that is opposite the side of the first, second and fourth integral formations (18, 19, 24), which extends parallel to a plane extending perpendicularly to the symmetry axis (26) of the casting core (17), for forming a cover (15) of the continuation (14) of the cooling channel (8), which extends parallel to the plane, and the third integral formation (20) also has an underside (27) that, proceeding from the first Integral formation (18), extends to the end (21) of the casting core (17) obliquely with respect to the plane extending perpendicularly to the symmetry axis (20).
EP09005283A 2008-04-22 2009-04-11 Foundry core to construct a cooling channel Not-in-force EP2113319B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008020231A DE102008020231A1 (en) 2008-04-22 2008-04-22 Casting core for forming a cooling channel

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EP2113319A2 EP2113319A2 (en) 2009-11-04
EP2113319A3 EP2113319A3 (en) 2010-04-14
EP2113319B1 true EP2113319B1 (en) 2012-10-17

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EP (1) EP2113319B1 (en)
DE (1) DE102008020231A1 (en)

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DE102008002571A1 (en) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine
DE102012203570A1 (en) * 2012-03-07 2013-09-12 Mahle International Gmbh Cast light metal piston, especially an aluminum piston
DE102012213558A1 (en) 2012-08-01 2014-02-06 Mahle International Gmbh piston
DE102012215543A1 (en) * 2012-08-31 2014-03-06 Mahle International Gmbh Casting mold of a piston
US8800526B2 (en) 2012-12-21 2014-08-12 Caterpillar, Inc. Instrumented piston for an internal combustion engine
JP2014185522A (en) * 2013-03-21 2014-10-02 Hitachi Automotive Systems Ltd Piston of internal combustion engine
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
DE102014008978A1 (en) 2014-06-17 2016-01-21 Daimler Ag Method for producing a steel piston and steel piston for an internal combustion engine
MX2018005970A (en) * 2015-11-19 2018-09-05 Ks Kolbenschmidt Gmbh Cast inflow and outflow openings for cast-steel and cast-iron pistons.
US11248557B1 (en) * 2020-12-03 2022-02-15 Caterpillar Inc. Piston having oil gallery drain outlets biased in distribution to anti-thrust side

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US3865179A (en) * 1972-12-15 1975-02-11 Audi Ag Piston for rotary piston machines and means for its manufacture
JP4383992B2 (en) * 2004-09-21 2009-12-16 株式会社豊田自動織機 Piston for internal combustion engine
JP4276602B2 (en) * 2004-09-21 2009-06-10 株式会社豊田自動織機 Piston for internal combustion engine
DE102005061075A1 (en) * 2005-12-21 2007-06-28 Mahle International Gmbh Piston for internal combustion engine has hub cooling channels arranged in bolt hub regions close to bottom of piston and each connected to cooling channel
DE102006056013A1 (en) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Piston for internal-combustion engine, has radially rotating cooling ducts spaced apart from each other and integrated to piston head and ring zone, and forming vertically aligned cross sectional profile
DE102007044105A1 (en) 2007-04-27 2008-10-30 Mahle International Gmbh Casting core for forming a cooling channel in a piston produced by casting

Also Published As

Publication number Publication date
DE102008020231A1 (en) 2009-10-29
US8079403B2 (en) 2011-12-20
EP2113319A3 (en) 2010-04-14
EP2113319A2 (en) 2009-11-04
US20090261232A1 (en) 2009-10-22

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