EP2636468A2 - Device for manufacturing a cylinder crankcase - Google Patents

Device for manufacturing a cylinder crankcase Download PDF

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Publication number
EP2636468A2
EP2636468A2 EP13152983.6A EP13152983A EP2636468A2 EP 2636468 A2 EP2636468 A2 EP 2636468A2 EP 13152983 A EP13152983 A EP 13152983A EP 2636468 A2 EP2636468 A2 EP 2636468A2
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EP
European Patent Office
Prior art keywords
cylinder crankcase
web
producing
cylinder
mold
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
EP13152983.6A
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German (de)
French (fr)
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EP2636468B1 (en
EP2636468A3 (en
Inventor
Stephan Beer
Steffen Ziegler
Christian Klimesch
Ludger Urhahn
Helge Woelbing
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KS Huayu Alutech GmbH
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KS Aluminium Technologie GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • 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
    • B22C9/103—Multipart cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/108—Siamese-type cylinders, i.e. cylinders cast together

Definitions

  • the invention relates to a device for producing a cylinder crankcase with a mold having a plurality of moldings, at least one water jacket core, which is arranged on both longitudinal sides of one or more mold lines forming a cylinder row and at least one web core, which is arranged between the molded parts forming the individual cylinders of a cylinder row ,
  • the cylinder crankcase is manufactured independently of the choice of the cylinder assembly to reduce weight and space with very small distances between the cylinders of a cylinder bank. Nevertheless, both a sufficient strength of the cylinder bounding side walls must be ensured as well as a sufficient cooling of these land areas between the cylinders, otherwise a thermal overload is to be feared in highly loaded engines.
  • a disadvantage of the known embodiments is that these web cooling-creating cores are aligned only to other core parts, which in particular can cause errors when these channels are supplied from the cylinder head with cooling water.
  • the later cooling channel is in exact alignment with the walls of the cylinder crankcase. A summation of positional tolerances is excluded.
  • the at least one web core is positively secured to a molding of the mold.
  • the attachment can be made by simply plugging, whereby the cycle times are shortened compared to a non-positive connection.
  • the at least one web core projects from at least one surface of a cavity of the casting mold forming the cylinder crankcase, forming a cylinder top. Accordingly, there is the possibility of supplying the web cooling via the cylinder head in the finished cylinder crankcase, with connections to the water jacket of the cylinder can be omitted.
  • the at least one web core protrudes at two opposite sides of the cylinder forming molding from the sides of the cylinder deck forming surface of the cylinder crankcase forming cavity of the mold. This allows the web core on both sides be attached to the mold. Furthermore, both passages can be used for cooling water supply on the finished cylinder crankcase.
  • the at least one web core has two legs extending parallel to the cylinder axis, which extend into the web-forming cavity between the mold parts forming the cylinders. Accordingly, thin interfaces, as would arise in an oblique arrangement, avoided, which increases the strength of the finished cylinder crankcase.
  • the arranged in the cavity of the mold part of the web core is substantially U-shaped, wherein the two legs protrude beyond the cylinder crankcase forming cavity of the mold.
  • arms extending from the legs above the cavity of the mold to both sides extend in opposite directions to the mold members forming the cylinders which rest on a mold member of the mold. Accordingly, the arms can be fixed to the mold outside the areas where the cores are to be arranged.
  • At least one of the arms has a projection over which the web core engages positively in a correspondingly shaped recess of the casting mold.
  • its position is determined by simply inserting the web core into the mold.
  • an upper and a lower web cooling is produced with a web core.
  • the strength of the web remains sufficiently preserved by the arranged between the later channels connection.
  • the at least one web core made of sand, artificial sand, salt, glass, graphite or ceramic.
  • sand, artificial sand, salt, glass, graphite or ceramic are suitable, all of which are compatible with the corresponding arrangement
  • a plurality of web cores are arranged one behind the other and connected to each other by a frame, whereby the web cores can be inserted together, which shortens the set-up time for casting.
  • the frame consists of two struts which extend parallel to the longitudinal sides of the cylinder crankcase forming cavity. This results in only a small effort in the production of the frame, which can also be made of different materials.
  • the at least one web core is arranged such that after casting by means of a bore, a connection between the cooling channel formed by the web core and the cooling channel formed by the water jacket core can be produced.
  • both the web cooling and the remaining cylinder cooling can be supplied via common inlets and outlets, for example via the cylinder head with cooling water, so that additional connections can be omitted.
  • an apparatus for manufacturing a cylinder crankcase which assures reliable positioning of the fin cooling to the cylinders, thereby reducing the expense of producing the respective ducts by optimizing the assembly and assembly of the cores.
  • the device according to the invention for producing a cylinder crankcase 10 comprises a casting mold 12 which has, for example, a lower part 14, two side parts 15 and an upper part 16 as molded parts forming the outer contours of the cylinder crankcase 10 and also mold parts 20 forming a plurality of cylinders 18 of the cylinder crankcase 10.
  • water jacket cores 22 are a series of several of the cylinder 18 forming moldings 20 is surrounded at a small distance at their opposite longitudinal sides 24 and the head and foot. These water jacket cores 22 are removed after casting the cylinder crankcase 10 from the casting, so that the resulting cavity forms a cooling channel of the cylinder 18.
  • web cores 28 are therefore proposed for the formation of cooling water channels in the web region, which are arranged in the casting mold 12 and aligned with the casting mold 12 or with one of the mold parts 14, 16 of the casting mold 12.
  • Such a web core 28 may be made of mineral sands, synthetic sand, salt, glass, ceramics or graphite.
  • the web core 28 shown in the figures has, in the region, which is arranged in the cylinder crankcase 10 forming cavity 30 of the mold 12, a U-shape with two parallel to the cylinder axis extending legs 32, 34 and a connection 36 between these legs 32, 34th on.
  • the legs 32, 34 protrude from the surface, which forms after casting a cylinder deck 38, so the surface of the cylinder crankcase 10, out of the cavity 30. Accordingly, the finished cast cylinder crankcase 10 at these positions openings, which make it possible to connect to the cooling water passage of a cylinder head, not shown.
  • the web core 28 at the connection 36 between the legs 32, 34 may have an opening 35. This opening is filled with material during casting, so that an upper connection 37 between the legs 32, 34 and a lower connection 39 between the legs 32, 34 extends. Accordingly, different areas of the web 26 can be cooled, without the strength of the webs 26 is reduced too much.
  • the upper part 16 has a recess 44 into which a projection 46 engages, which is formed on the end region 48 of the arm 40 of the web core 28.
  • the surrounding casting mold 12 has a correspondingly shaped section 52.
  • the web cores 28, as in FIG. 2 is shown connected to each other via a frame 54.
  • This frame 54 has two parallel to the longitudinal sides 24 of the cylinder crankcase 10 extending struts 56, 58 which are connected to the arms 40, 42 a plurality of longitudinally successively arranged web cores 28 or made in one piece with these and together with the web cores 28 in the mold 12 are inserted positively. In this way, a plurality of web cores 28 can be inserted together, whereby the set-up time of the mold 12 is shortened.
  • the web cores are removed depending on the selected material in a known manner from the cylinder crankcase. Subsequently, the cooling water channels of the cylinder 18 can be connected by simple holes with the web cooling water channels. However, two separate cooling water circuits can be used.

Abstract

Apparatus comprises a casting mold (12) having a multiple of molded parts (14, 15, 16), at least one water jacket core (22) arranged on two longitudinal sides (24) of at least one mold part (20) forming a row of cylinders, and at least one web core, which is inserted into the casting mold and aligned with the casting mold, where the web core is arranged between the individual cylinders of the mold part forming the row of cylinders.

Description

Die Erfindung betrifft eine Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses mit einer Gießform mit mehreren Formteilen, zumindest einem Wassermantelkern, welcher an beiden Längsseiten eines oder mehrerer eine Zylinderreihe bildender Formteile angeordnet ist und zumindest einem Stegkern, welcher zwischen den die einzelnen Zylinder einer Zylinderreihe bildenden Formteilen angeordnet ist.The invention relates to a device for producing a cylinder crankcase with a mold having a plurality of moldings, at least one water jacket core, which is arranged on both longitudinal sides of one or more mold lines forming a cylinder row and at least one web core, which is arranged between the molded parts forming the individual cylinders of a cylinder row ,

Bei modernen Verbrennungsmotoren wird das Zylinderkurbelgehäuse unabhängig von der Wahl der Zylinderanordnung zur Reduzierung von Gewicht und Bauraum mit sehr kleinen Abständen zwischen den Zylindern einer Zylinderreihe hergestellt. Dennoch muss sowohl eine ausreichende Festigkeit der die Zylinder begrenzenden Seitenwände sichergestellt werden als auch eine ausreichende Kühlung dieser Stegbereiche zwischen den Zylindern, da andernfalls bei hochbelasteten Motoren eine thermische Überbeanspruchung zu befürchten ist.In modern internal combustion engines, the cylinder crankcase is manufactured independently of the choice of the cylinder assembly to reduce weight and space with very small distances between the cylinders of a cylinder bank. Nevertheless, both a sufficient strength of the cylinder bounding side walls must be ensured as well as a sufficient cooling of these land areas between the cylinders, otherwise a thermal overload is to be feared in highly loaded engines.

Aus diesem Grund ist es bekannt, in die Gießformen neben den einen Kühlkanal an den Längsseiten der Zylinder bildenden Wassermantelkernen zusätzliche Bohrungen in den Stegbereich einzubringen, über die die gegenüberliegenden Kühlkanäle miteinander verbunden werden. Eine Brennkraftmaschine mit einer derartig ausgebildeten Stegkühlung ist beispielsweise aus der DE 10 2005 037 384 A1 bekannt.For this reason, it is known to introduce additional bores in the web area in the casting molds in addition to the cooling channel on the longitudinal sides of the cylinder forming water jacket cores, via which the opposite cooling channels are interconnected. An internal combustion engine with such trained web cooling is for example from the DE 10 2005 037 384 A1 known.

Häufig ist es jedoch wünschenswert auf eine Nachbearbeitung an den dünnen Stegen verzichten zu können. Entsprechend wird in der DE 198 32 718 A1 vorgeschlagen, zwischen die den Wassermangel bildenden Kerne eine Graphitplatte einzusetzen, welcher in die beiden Kerne eingeformt ist. Die Graphitplatte bildet nach ihrem Abbrennen am fertigen Zylinderkurbelgehäuse eine Querbohrung zwischen den beiden Wassermänteln an den Längsseiten.Often, however, it is desirable to be able to do without post-processing on the thin webs. Accordingly, in the DE 198 32 718 A1 proposed to insert a graphite plate, which is formed in the two cores between the cores forming the water shortage. The graphite plate forms after its burning on the finished cylinder crankcase a transverse bore between the two water jackets on the long sides.

Ähnliche Verbindungsöffnungen zwischen den gegenüberliegenden Kühlmittelmänteln werden in der DE 10 2009 033 402 A1 durch die Verwendung eines faserhaltigen Materials oder in der DE 38 28 093 A1 durch die Verwendung von Keramik, welches zwischen den Kühlmantelkernen durch diese in Position gehalten wird und die beiden Kühlmantelkerne miteinander verbinden, geschaffen. Diese die Stegkühlungskanäle bildenden Teile werden anschließend aus dem Gussstück entfernt. Bei der DE 38 28 093 A1 werden die Kerne über Öffnungen an der Zylinderdeckfläche durch anschließendes Kernputzen entfernt.Similar connection openings between the opposite coolant jackets are in the DE 10 2009 033 402 A1 through the use of a fibrous material or in the DE 38 28 093 A1 by the use of ceramic, which is held between the cooling jacket cores by them in position and connect the two cooling jacket cores together created. These web cooling channels forming parts are then removed from the casting. In the DE 38 28 093 A1 the cores are removed through openings on the cylinder top surface by subsequent core cleaning.

Des Weiteren ist aus der EP 0 197 365 A2 eine Vorrichtung zur gießtechnischen Herstellung eines Kühlkanals im Stegbereich zwischen zwei Zylindern bekannt, bei der separate Kerne zur Bildung dieser Kühlwasserkanäle verwendet werden, die nicht gezwungenermaßen mit den Kühlwasserkanälen der üblichen Wassermäntel in Kontakt stehen. Diese werden im Sohlenkern fixiert und sind wie der Sohlenkern aus Sand hergestellt. Entsprechend befinden sich an der zum Zylinderkopf weisenden Oberfläche des fertigen Zylinderkurbelgehäuses Öffnungen, über die die Stegkühlkanäle mit Kühlmittel versorgt werden können.Furthermore, from the EP 0 197 365 A2 a device for the technical production of a cooling channel in the web area between two cylinders known to be used in the separate cores to form these cooling water channels, which are not forced to be in contact with the cooling water channels of the usual water jackets. These are fixed in the sole core and, like the sole core, are made of sand. Accordingly, located on the surface facing the cylinder head surface of the finished cylinder crankcase openings through which the web cooling channels can be supplied with coolant.

Nachteilig an den bekannten Ausführungen ist, dass diese eine Stegkühlung schaffenden Kerne lediglich zu anderen Kernteilen ausgerichtet werden, wodurch insbesondere dann Fehler entstehen können, wenn diese Kanäle aus dem Zylinderkopf mit Kühlwasser versorgt werden.A disadvantage of the known embodiments is that these web cooling-creating cores are aligned only to other core parts, which in particular can cause errors when these channels are supplied from the cylinder head with cooling water.

Es stellt sich daher die Aufgabe, eine Vorrichtung zur Herstellung von Zylinderkurbelgehäusen insbesondere aus einer Leichtmetallegierung zu schaffen, mit der sichergestellt werden kann, dass auch filigrane Stegkühlungen mit Anschluss zum Zylinderkopf optimal im Gussstück angeordnet sind.It is therefore the object to provide a device for the production of cylinder crankcases, in particular made of a light metal alloy, with which it can be ensured that filigree web cooling are optimally arranged with connection to the cylinder head in the casting.

Diese Aufgabe wird durch eine Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses mit den Merkmalen des Hauptanspruchs gelöst.This object is achieved by a device for producing a cylinder crankcase having the features of the main claim.

Dadurch, dass der zumindest eine Stegkern in die Gießform eingelegt und zur Gießform ausgerichtet ist, befindet sich der spätere Kühlkanal in exakter Ausrichtung zu den Wänden des Zylinderkurbelgehäuses. Eine Summation von Lagetoleranzen wird ausgeschlossen.Characterized in that the at least one web core is inserted into the mold and aligned with the mold, the later cooling channel is in exact alignment with the walls of the cylinder crankcase. A summation of positional tolerances is excluded.

Vorzugsweise ist der zumindest eine Stegkern formschlüssig an einem Formteil der Gießform befestigt. So kann die Befestigung durch einfaches Einstecken vorgenommen werden, wodurch die Taktzeiten im Vergleich zu einer kraftschlüssigen Verbindung verkürzt werden.Preferably, the at least one web core is positively secured to a molding of the mold. Thus, the attachment can be made by simply plugging, whereby the cycle times are shortened compared to a non-positive connection.

In einer vorteilhaften Ausführung ragt der zumindest eine Stegkern aus zumindest einer ein Zylinderdeck bildenden Oberfläche eines das Zylinderkurbelgehäuse bildenden Hohlraums der Gießform hinaus. Entsprechend besteht die Möglichkeit einer Versorgung der Stegkühlung über den Zylinderkopf im fertigen Zylinderkurbelgehäuse, wobei auf Verbindungen zum Wassermantel der Zylinder verzichtet werden kann.In an advantageous embodiment, the at least one web core projects from at least one surface of a cavity of the casting mold forming the cylinder crankcase, forming a cylinder top. Accordingly, there is the possibility of supplying the web cooling via the cylinder head in the finished cylinder crankcase, with connections to the water jacket of the cylinder can be omitted.

In einer weiterführenden Ausbildung der erfindungsgemäßen Vorrichtung ragt der zumindest eine Stegkern an zwei bezüglich des den Zylinder bildenden Formteils gegenüberliegenden Seiten aus der das Zylinderdeck bildenden Oberfläche des das Zylinderkurbelgehäuse bildenden Hohlraums der Gießform hinaus. Hierdurch kann der Stegkern beidseitig an der Gießform befestigt werden. Des Weiteren können am fertigen Zylinderkurbelgehäuse beide Durchgänge zur Kühlwasserversorgung genutzt werden.In a further development of the device according to the invention, the at least one web core protrudes at two opposite sides of the cylinder forming molding from the sides of the cylinder deck forming surface of the cylinder crankcase forming cavity of the mold. This allows the web core on both sides be attached to the mold. Furthermore, both passages can be used for cooling water supply on the finished cylinder crankcase.

Bevorzugt weist der zumindest eine Stegkern zwei sich parallel zur Zylinderachse erstreckende Schenkel auf, die sich in den Steg bildenden Hohlraum zwischen den die Zylinder bildenden Formteile erstrecken. Entsprechend werden dünne Grenzflächen, wie sie bei schräger Anordnung entstünden, vermieden, was die Festigkeit des fertigen Zylinderkurbelgehäuses erhöht.Preferably, the at least one web core has two legs extending parallel to the cylinder axis, which extend into the web-forming cavity between the mold parts forming the cylinders. Accordingly, thin interfaces, as would arise in an oblique arrangement, avoided, which increases the strength of the finished cylinder crankcase.

In einer weiterführenden vorteilhaften Ausgestaltung der Erfindung ist der im Hohlraum der Gießform angeordnete Teil des Stegkerns im Wesentlichen U-förmig ausgebildet, wobei die beiden Schenkel über den das Zylinderkurbelgehäuse bildenden Hohlraum der Gießform ragen. So besteht eine Verbindung zwischen den beiden Schenkeln, die dazu führt, dass die beiden Durchtritte des Stegkern aus dem Hohlraum als Kühlmittelein- und -auslässe genutzt werden können, was die Strömungsführung vereinfacht und Totwassergebiete zuverlässig verhindert.In a further advantageous embodiment of the invention, the arranged in the cavity of the mold part of the web core is substantially U-shaped, wherein the two legs protrude beyond the cylinder crankcase forming cavity of the mold. Thus, there is a connection between the two legs, which results in that the two passages of the web core can be used from the cavity as Kühlmittelein- and -auslässe, which simplifies the flow and reliably prevents dead water areas.

Vorzugsweise erstrecken sich von den Schenkeln aus oberhalb des Hohlraums der Gießform zu beiden Seiten Arme in zu den die Zylinder bildenden Formteilen entgegengesetzten Richtungen, welche auf einem Formteil der Gießform aufliegen. Entsprechend können die Arme außerhalb der Bereiche, in denen die Kerne anzuordnen sind, an der Form fixiert werden.Preferably, arms extending from the legs above the cavity of the mold to both sides extend in opposite directions to the mold members forming the cylinders which rest on a mold member of the mold. Accordingly, the arms can be fixed to the mold outside the areas where the cores are to be arranged.

In einer besonderen Ausbildung weist zumindest einer der Arme einen Vorsprung auf, über den der Stegkern formschlüssig in eine entsprechend geformte Ausnehmung der Gießform greift. So wird durch einfaches Einlegen des Stegkerns in die Gießform dessen Lage festgelegt. Vorzugsweise weist der Stegkern an der Verbindung zwischen den Schenkeln eine Öffnung auf, über die eine obere Verbindung zwischen den Schenkeln von einer unteren Verbindung zwischen den Schenkeln getrennt ist. So wird eine obere und eine untere Stegkühlung mit einem Stegkern hergestellt. Die Festigkeit des Steges bleibt jedoch durch die zwischen den späteren Kanälen angeordnete Verbindung ausreichend erhalten.In a particular embodiment, at least one of the arms has a projection over which the web core engages positively in a correspondingly shaped recess of the casting mold. Thus, its position is determined by simply inserting the web core into the mold. Preferably, the web core at the connection between the legs on an opening, via which an upper connection between the legs is separated from a lower connection between the legs. Thus, an upper and a lower web cooling is produced with a web core. However, the strength of the web remains sufficiently preserved by the arranged between the later channels connection.

Weiterhin ist der zumindest eine Stegkern aus Sand, Kunstsand, Salz, Glas, Graphit oder Keramik hergestellt. Je nach gewünschter filigraner Form und Anwendung eignen sich unterschiedliche Materialien, welche alle mit der entsprechenden Anordnung vereinbar sindFurthermore, the at least one web core made of sand, artificial sand, salt, glass, graphite or ceramic. Depending on the desired filigree shape and application, different materials are suitable, all of which are compatible with the corresponding arrangement

In einer besonders bevorzugten Ausführung sind mehrere Stegkerne hintereinander angeordnet und durch einen Rahmen miteinander verbunden, wodurch die Stegkerne gemeinsam eingelegt werden können, was die Rüstzeit zum Gießen verkürzt.In a particularly preferred embodiment, a plurality of web cores are arranged one behind the other and connected to each other by a frame, whereby the web cores can be inserted together, which shortens the set-up time for casting.

In einer hierzu weiterführenden Ausbildung besteht der Rahmen aus zwei Streben, die sich parallel zu den Längsseiten des das Zylinderkurbelgehäuse bildenden Hohlraums verlaufen. Hierdurch entsteht lediglich ein geringer Aufwand bei der Herstellung des Rahmens, der ebenfalls aus verschiedenen Materialien hergestellt werden kann.In a further development, the frame consists of two struts which extend parallel to the longitudinal sides of the cylinder crankcase forming cavity. This results in only a small effort in the production of the frame, which can also be made of different materials.

Auch besteht die Möglichkeit, den Rahmen und die Stegkerne einstückig auszubilden, so dass jeglicher Zusammenbau entfällt, wodurch die Montagezeiten verkürzt werden.It is also possible to form the frame and the web cores in one piece, so that any assembly is omitted, whereby the assembly times are shortened.

Auch ist es vorteilhaft, wenn der zumindest eine Stegkern derart angeordnet ist, dass nach dem Gießen mittels einer Bohrung eine Verbindung zwischen dem durch den Stegkern gebildeten Kühlkanal und dem durch den Wassermantelkern gebildeten Kühlkanal herstellbar ist. Bei einer derartigen Anordnung kann sowohl die Stegkühlung als auch die übrige Zylinderkühlung über gemeinsame Einlässe und Auslässe beispielsweise über den Zylinderkopf mit Kühlwasser versorgt werden, so dass zusätzliche Anschlüsse entfallen können.It is also advantageous if the at least one web core is arranged such that after casting by means of a bore, a connection between the cooling channel formed by the web core and the cooling channel formed by the water jacket core can be produced. In such an arrangement, both the web cooling and the remaining cylinder cooling can be supplied via common inlets and outlets, for example via the cylinder head with cooling water, so that additional connections can be omitted.

Es wird somit eine Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses geschaffen, mit dem eine zuverlässige Positionierung der Stegkühlung zu den Zylindern sichergestellt wird, wobei der Aufwand zur Herstellung der entsprechenden Kanäle reduziert wird, indem der Zusammenbau und die Montage der Kerne optimiert wird.Thus, there is provided an apparatus for manufacturing a cylinder crankcase which assures reliable positioning of the fin cooling to the cylinders, thereby reducing the expense of producing the respective ducts by optimizing the assembly and assembly of the cores.

Ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses ist in den Zeichnungen dargestellt und wird nachfolgend beschrieben.

  • Figur 1 zeigt eine Seitenansicht einer erfindungsgemäßen Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses in geschnittener Darstellung.
  • Figur 2 zeigt eine perspektivische Darstellung einer bevorzugten Ausführungsform eines Rahmens mit Stegkernen.
An embodiment of an inventive device for producing a cylinder crankcase is shown in the drawings and will be described below.
  • FIG. 1 shows a side view of an inventive device for producing a cylinder crankcase in a sectional view.
  • FIG. 2 shows a perspective view of a preferred embodiment of a frame with web cores.

Die erfindungsgemäße Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses 10 besteht aus einer Gießform 12, die beispielsweise ein Unterteil 14, zwei Seitenteile 15 und ein Oberteil 16 als die Außenkonturen des Zylinderkurbelgehäuses 10 bildende Formteile sowie mehrere Zylinder 18 des Zylinderkurbelgehäuses 10 bildende Formteile 20 aufweist.The device according to the invention for producing a cylinder crankcase 10 comprises a casting mold 12 which has, for example, a lower part 14, two side parts 15 and an upper part 16 as molded parts forming the outer contours of the cylinder crankcase 10 and also mold parts 20 forming a plurality of cylinders 18 of the cylinder crankcase 10.

In dieser Gießform 12 befinden sich ein oder mehrere Wassermantelkerne 22, welche eine Reihe, die aus mehreren die Zylinder 18 bildenden Formteilen 20 besteht, mit geringem Abstand an ihren gegenüberliegenden Längsseiten 24 sowie am Kopf- und Fußbereich umgeben. Diese Wassermantelkerne 22 werden nach dem Gießen des Zylinderkurbelgehäuses 10 aus dem Gussteil entfernt, so dass der entstehende Hohlraum einen Kühlkanal der Zylinder 18 bildet.In this mold 12 are one or more water jacket cores 22, which are a series of several of the cylinder 18 forming moldings 20 is surrounded at a small distance at their opposite longitudinal sides 24 and the head and foot. These water jacket cores 22 are removed after casting the cylinder crankcase 10 from the casting, so that the resulting cavity forms a cooling channel of the cylinder 18.

Diese Wassermantelkerne 22 sind jedoch aufgrund der extrem kleinen Abmessungen der Stege 26 nicht geeignet, auch einen Hohlraum in Stegen 26 zwischen den Zylindern 18 zu bilden, der dringend erforderlich ist, um eine ausreichende Kühlung zur Verhinderung thermischer Überlastung in diesen Bereichen sicherzustellen.These water jacket cores 22, however, are not capable of forming a cavity in lands 26 between the cylinders 18 due to the extremely small dimensions of the lands 18, which is urgently required to ensure sufficient cooling to prevent thermal overload in those areas.

Erfindungsgemäß werden daher zur Bildung von Kühlwasserkanälen im Stegbereich Stegkerne 28 vorgeschlagen, welche in der Gießform 12 angeordnet und an der Gießform 12 beziehungsweise an einem der Formteile 14, 16 der Gießform 12 ausgerichtet werden.According to the invention, web cores 28 are therefore proposed for the formation of cooling water channels in the web region, which are arranged in the casting mold 12 and aligned with the casting mold 12 or with one of the mold parts 14, 16 of the casting mold 12.

Ein derartiger Stegkern 28 kann aus mineralischen Sanden, aus Kunstsand, Salz, Glas, Keramik oder Graphit hergestellt werden. Der in den Figuren dargestellte Stegkern 28 weist in dem Bereich, weicher im das Zylinderkurbelgehäuse 10 bildenden Hohlraum 30 der Gießform 12 angeordnet ist, eine U-Form mit zwei parallel zur Zylinderachse verlaufenden Schenkeln 32, 34 und einer Verbindung 36 zwischen diesen Schenkeln 32, 34 auf. Die Schenkel 32, 34 ragen dabei aus der Fläche, welche nach dem Gießen ein Zylinderdeck 38, also die Oberfläche des Zylinderkurbelgehäuses 10 bildet, aus dem Hohlraum 30 heraus. Entsprechend weist das fertig gegossene Zylinderkurbelgehäuse 10 an diesen Positionen Öffnungen auf, die es ermöglichen, eine Verbindung zum Kühlwasserkanal eines nicht dargestellten Zylinderkopfes herzustellen.Such a web core 28 may be made of mineral sands, synthetic sand, salt, glass, ceramics or graphite. The web core 28 shown in the figures has, in the region, which is arranged in the cylinder crankcase 10 forming cavity 30 of the mold 12, a U-shape with two parallel to the cylinder axis extending legs 32, 34 and a connection 36 between these legs 32, 34th on. The legs 32, 34 protrude from the surface, which forms after casting a cylinder deck 38, so the surface of the cylinder crankcase 10, out of the cavity 30. Accordingly, the finished cast cylinder crankcase 10 at these positions openings, which make it possible to connect to the cooling water passage of a cylinder head, not shown.

Des Weiteren ist in Figur 2 dargestellt, dass der Stegkern 28 an der Verbindung 36 zwischen den Schenkeln 32, 34 eine Öffnung 35 aufweisen kann. Diese Öffnung wird beim Gießen mit Material gefüllt, so dass sich eine obere Verbindung 37 zwischen den Schenkeln 32, 34 und eine untere Verbindung 39 zwischen den Schenkeln 32, 34 erstreckt. Entsprechend können unterschiedliche Bereiche des Steges 26 gekühlt werden, ohne dass die Festigkeit der Stege 26 zu sehr herabgesetzt wird.Furthermore, in FIG. 2 illustrated that the web core 28 at the connection 36 between the legs 32, 34 may have an opening 35. This opening is filled with material during casting, so that an upper connection 37 between the legs 32, 34 and a lower connection 39 between the legs 32, 34 extends. Accordingly, different areas of the web 26 can be cooled, without the strength of the webs 26 is reduced too much.

Entlang der das Zylinderdeck 38 bildenden Oberfläche des Hohlraums 30 erstrecken sich von den Schenkeln 32, 34 in entgegengesetzter Richtung zueinander Arme 40, 42 des Stegkerns 28, welche auf der Gießform 12 und im vorliegenden Ausführungsbeispiel auf den Seitenteilen 15 der Gießform 12 aufliegen. Beide Arme 40, 42 weisen in ihren Endbereichen 48, 50 einen Abschnitt auf, der sich im Wesentlichen schräg von der Oberfläche des Zylinderdecks 38 und somit von den Seitenteilen 15 entfernt. Das Oberteil 16 weist eine Ausnehmung 44 auf, in welche ein Vorsprung 46 greift, der am Endbereich 48 des Arms 40 des Stegkerns 28 ausgebildet ist. Die umgebende Gießform 12 weist einen hierzu korrespondierend geformten Abschnitt 52 auf. Insgesamt ergibt sich eine im Wesentlichen formschlüssige Lage des Stegkerns 28 in der Gießform 12, welche durch das Schließen der Gießform 12 durch Absenken des Oberteils 16 beziehungsweise eines nicht dargestellten aufliegenden Deckelformteils, in dem auch das Formteil zur Bildung der Zylinder ausgebildet ist, abschließend fixiert wird. Ein Verschieben innerhalb der Gießform 12 ist ausgeschlossen, so dass die Lage zu den Zylindern im Steg 26 mit sehr geringen Toleranzen festliegt, so dass filigrane Kühlkanäle im Stegbereich hergestellt werden können.Along the cylinder deck 38 forming surface of the cavity 30 extending from the legs 32, 34 in the opposite direction to each other arms 40, 42 of the web core 28, which rest on the mold 12 and in the present embodiment on the side parts 15 of the mold 12. Both arms 40, 42 have in their end regions 48, 50 on a portion which is substantially obliquely away from the surface of the cylinder deck 38 and thus from the side members 15. The upper part 16 has a recess 44 into which a projection 46 engages, which is formed on the end region 48 of the arm 40 of the web core 28. The surrounding casting mold 12 has a correspondingly shaped section 52. Overall results in a substantially positive position of the web core 28 in the mold 12, which is finally fixed by closing the mold 12 by lowering the upper part 16 and a non-illustrated overlying cover molding, in which the molded part is formed to form the cylinder , A displacement within the mold 12 is excluded, so that the position is fixed to the cylinders in the web 26 with very small tolerances, so that filigree cooling channels can be made in the web area.

Zur weiteren Vereinfachung können die Stegkerne 28, wie in Figur 2 dargestellt ist, über einen Rahmen 54 miteinander verbunden werden. Dieser Rahmen 54 weist zwei parallel zu den Längsseiten 24 des Zylinderkurbelgehäuses 10 verlaufende Streben 56, 58 auf, die mit den Armen 40, 42 mehrerer in Längsrichtung hintereinander angeordneter Stegkerne 28 verbunden oder einstückig mit diesen hergestellt sind und gemeinsam mit den Stegkernen 28 in die Gießform 12 formschlüssig eingelegt werden. Auf diese Weise können mehrere Stegkerne 28 gemeinsam eingelegt werden, wodurch die Rüstzeit der Gießform 12 verkürzt wird.For further simplification, the web cores 28, as in FIG. 2 is shown connected to each other via a frame 54. This frame 54 has two parallel to the longitudinal sides 24 of the cylinder crankcase 10 extending struts 56, 58 which are connected to the arms 40, 42 a plurality of longitudinally successively arranged web cores 28 or made in one piece with these and together with the web cores 28 in the mold 12 are inserted positively. In this way, a plurality of web cores 28 can be inserted together, whereby the set-up time of the mold 12 is shortened.

Nach dem Gießen werden die Stegkerne je nach gewähltem Material in bekannter Weise aus dem Zylinderkurbelgehäuse entfernt. Anschließend können die Kühlwasserkanäle der Zylinder 18 durch einfache Bohrungen mit den Stegkühlwasserkanälen verbunden werden. Es können jedoch auch zwei getrennte Kühlwasserkreisläufe benutzt werden.After casting, the web cores are removed depending on the selected material in a known manner from the cylinder crankcase. Subsequently, the cooling water channels of the cylinder 18 can be connected by simple holes with the web cooling water channels. However, two separate cooling water circuits can be used.

Die Ausbildung der beschriebenen Stegkerne und deren Anordnung in der Gießform ermöglicht eine filigrane Ausbildung von Stegkühlungen auch bei Zylinderkurbelgehäusen mit sehr dicht beieinander angeordneten Zylindern.The design of the web cores described and their arrangement in the mold allows filigree formation of web cooling even with cylinder crankcases with very close together arranged cylinders.

Es sollte deutlich sein, dass der Schutzbereich nicht auf das beschriebene Ausführungsbeispiel begrenzt ist. Insbesondere die genaue Ausbildung der Stegkerne sowie deren Befestigung in der Gießform sind veränderbar. Die Vorrichtung eignet sich für unterschiedliche Zylinderkurbelgehäuse und verschiedene Gießverfahren und Gießformen.It should be clear that the scope of protection is not limited to the embodiment described. In particular, the exact design of the web cores and their attachment in the mold are changeable. The device is suitable for different cylinder crankcases and various casting methods and molds.

Claims (14)

Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses (10) mit einer Gießform (12) mit mehreren Formteilen (14, 15, 16), zumindest einem Wassermantelkern (22), welcher an beiden Längsseiten (24) eines oder mehrerer eine Zylinderreihe bildender Formteile (20) angeordnet ist und
zumindest einem Stegkern (28), welcher zwischen den die einzelnen Zylinder (18) einer Zylinderreihe bildenden Formteilen (20) angeordnet ist,
dadurch gekennzeichnet, dass
der zumindest eine Stegkern (28) in die Gießform (12) eingelegt und zur Gießform (12) ausgerichtet ist.Device for producing a cylinder crankcase (10) having a casting mold (12) with a plurality of molded parts (14, 15, 16), at least one water jacket core (22), which is arranged on both longitudinal sides (24) of one or more molded parts (20) forming a cylinder bank is and
at least one web core (28) which is arranged between the mold parts (20) forming the individual cylinders (18) of a row of cylinders,
characterized in that
the at least one web core (28) is inserted into the casting mold (12) and aligned with the casting mold (12). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach Anspruch 1,
dadurch gekenntzeichnet, das
der zumindest eine Stegkern (28) formschlüssig an einem Formteil (14, 16) der Gießform (12) befestigt ist.Device for producing a cylinder crankcase according to claim 1,
characterized by that
the at least one web core (28) is fastened in a form-fitting manner to a shaped part (14, 16) of the casting mold (12). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, das
der zumindest eine Stegkern (28) aus zumindest einer ein Zylinderdeck (38) bildenden Oberfläche eines das Zylinderkurbelgehäuse (10) bildenden Hohlraums (30) der Gießform (12) hinausragt.Device for producing a cylinder crankcase according to one of claims 1 or 2,
characterized, that
the at least one web core (28) protrudes from at least one surface of a cavity (30) of the casting mold (12) which forms a cylinder cover (38) and forms a cavity of the cylinder crankcase (10). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, das
der zumindest eine Stegkern (28) an zwei bezüglich des den Zylinder (18) bildenden Formteils (20) gegenüberliegenden Seiten aus der das Zylinderdeck (38) bildenden Oberfläche des das Zylinderkurbelgehäuse (10) bildenden Hohlraums (30) der Gießform (12) hinausragt.Device for producing a cylinder crankcase according to one of the preceding claims,
characterized, that
the at least one web core (28) protrudes from the cylindrical surface (38) of the cavity (30) of the casting mold (12) forming the cylinder crankcase (10) on two sides opposite the molding (20) forming the cylinder cover (10). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach Anspruch 4,
dadurch gekennzeichnet, das
der zumindest eine Stegkern (28) zwei sich im Wesentlichen parallel zu einer Zylinderachse erstreckende Schenkel (32, 34) aufweist, die sich in den Steg (26) bildenden Hohlraum (30) zwischen den die Zylinder (18) bildenden Formteile (20) erstrecken.Device for producing a cylinder crankcase according to claim 4,
characterized, that
the at least one web core (28) has two legs (32, 34) extending substantially parallel to a cylinder axis and extending into the web (26) forming cavity (30) between the mold parts (20) forming the cylinders (18) , Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach Anspruch 5,
dadurch gekennzeichnet, dass
der im Hohlraum (30) der Gießform (12) angeordnete Teil des Stegkerns (28) im Wesentlichen U-förmig ausgebildet ist, wobei die beiden Schenkel (32, 34) über den das Zylinderkurbelgehäuse (10) bildenden Hohlraum (30) der Gießform (12) ragen.Apparatus for producing a cylinder crankcase according to claim 5,
characterized in that
the part of the web core (28) arranged in the cavity (30) of the casting mold (12) is substantially U-shaped, wherein the two limbs (32, 34) extend over the cavity (30) of the casting mold (30) forming the cylinder crankcase (10). 12) protrude. Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der Ansprüche 5 oder 6,
dadurch gekennzeichnet, dass
sich von den Schenkeln (32, 34) aus oberhalb des Hohlraums (30) der Gießform (12) zu beiden Seiten Arme (40 ,42) in zu den die Zylinder (18) bildenden Formteilen (20) entgegengesetzten
Richtungen erstrecken, welche auf einem Formteil (14, 16) der Gießform (12) aufliegen.Device for producing a cylinder crankcase according to one of claims 5 or 6,
characterized in that
extending from the legs (32, 34) above the cavity (30) of the mold (12) on either side opposite arms (40, 42) to the mold parts (20) forming the cylinders (18)
Extend directions which rest on a molding (14, 16) of the mold (12). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach Anspruch 7,
dadurch gekennzeichnet, dass
zumindest einer der Arme (40, 42) einen Vorsprung (46) aufweist, über den der Stegkern (28) formschlüssig in eine entsprechend geformte Ausnehmung (44) der Gießform (12) greift.Device for producing a cylinder crankcase according to claim 7,
characterized in that
at least one of the arms (40, 42) has a projection (46) over which the web core (28) engages positively in a correspondingly shaped recess (44) of the casting mold (12). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der Ansprüche 6 bis 8,
dadurch gekennzeichnet, dass
der Stegkern (28) an der Verbindung (36) zwischen den Schenkeln (32, 34) eine Öffnung (35) aufweist, über die eine obere Verbindung (37) zwischen den Schenkeln (32, 34) von einer unteren Verbindung (39) zwischen den Schenkeln (32, 34) getrennt ist.Device for producing a cylinder crankcase according to one of claims 6 to 8,
characterized in that
the web core (28) has at the connection (36) between the legs (32, 34) an opening (35) via which an upper connection (37) between the legs (32, 34) of a lower connection (39) between the legs (32, 34) is separated. Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
der zumindest eine Stegkern (28) aus Sand, Kunstsand, Salz, Glas, Graphit oder Keramik hergestellt ist.Device for producing a cylinder crankcase according to one of the preceding claims,
characterized in that
the at least one web core (28) is made of sand, artificial sand, salt, glass, graphite or ceramic. Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach
einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
mehrere Stegkerne (28) hintereinander angeordnet und durch einen Rahmen (54) miteinander verbunden sind.Device for producing a cylinder crankcase according to
one of the preceding claims,
characterized in that
a plurality of web cores (28) arranged one behind the other and connected by a frame (54). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach Anspruch 11,
dadurch gekennzeichnet, dass
der Rahmen (54) aus zwei Streben (56, 58) besteht, die sich parallel zu den Längsseiten (24) des das Zylinderkurbelgehäuse (10) bildenden Hohlraums (30) verlaufen.Device for producing a cylinder crankcase according to claim 11,
characterized in that
the frame (54) consists of two struts (56, 58) which run parallel to the longitudinal sides (24) of the cylinder crankcase (10) forming the cavity (30). Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der Ansprüche 11 oder 12,
dadurch gekennzeichnet, dass
der Rahmen (54) und die Stegkerne (28) einstückig ausgebildet sind.Device for producing a cylinder crankcase according to one of claims 11 or 12,
characterized in that
the frame (54) and the web cores (28) are integrally formed. Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
der zumindest eine Stegkern (28) derart angeordnet ist, dass nach dem Gießen mittels einer Bohrung eine Verbindung zwischen dem durch den Stegkern (28) gebildeten Kühlkanal und dem durch den Wassermantelkern (22) gebildeten Kühlkanal herstellbar ist.Device for producing a cylinder crankcase according to one of the preceding claims,
characterized in that
the at least one web core (28) is arranged such that after casting by means of a bore, a connection between the cooling channel formed by the web core (28) and the cooling channel formed by the water jacket core (22) can be produced.
EP13152983.6A 2012-03-06 2013-01-29 Device for manufacturing a cylinder crankcase Active EP2636468B1 (en)

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AT525313A1 (en) * 2018-01-16 2023-02-15 Avl List Gmbh CYLINDER BLOCK OF AN INTERNAL ENGINE

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DE102012101893A1 (en) 2013-09-12
DE102012101893C5 (en) 2022-06-23
DE102012101893B4 (en) 2016-03-31
EP2636468A3 (en) 2018-01-03

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