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EP1368562B1 - Cylinder - crankcase of a liquid cooled internal combustion engine - Google Patents

Cylinder - crankcase of a liquid cooled internal combustion engine Download PDF

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Publication number
EP1368562B1
EP1368562B1 EP02700217A EP02700217A EP1368562B1 EP 1368562 B1 EP1368562 B1 EP 1368562B1 EP 02700217 A EP02700217 A EP 02700217A EP 02700217 A EP02700217 A EP 02700217A EP 1368562 B1 EP1368562 B1 EP 1368562B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
magnesium
engine block
casing
aluminium
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.)
Expired - Lifetime
Application number
EP02700217A
Other languages
German (de)
French (fr)
Other versions
EP1368562A1 (en
Inventor
Rudolf Flierl
Johann Wolf
Rudolf Gibisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP1368562A1 publication Critical patent/EP1368562A1/en
Application granted granted Critical
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • 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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0085—Materials for constructing engines or their parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1824—Number of cylinders six
    • 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
    • F02F2001/104—Cylinders; Cylinder heads  having cooling means for liquid cooling using an open deck, i.e. the water jacket is open at the block top face
    • 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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F2007/009—Hypereutectic aluminum, e.g. aluminum alloys with high SI content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/028—Magnesium

Definitions

  • the invention relates to a cylinder crankcase for a liquid-cooled internal combustion engine.
  • crankshaft bearings preferably made of a higher loadable material and form the less loaded housing walls separately from a lighter, in particular thin-walled fabric under consideration a material-adapted separate guide for liquid fuels.
  • a cylinder crankcase for a liquid-cooled internal combustion engine in which a drive block is wrapped on a deck crankshaft side molded bearing chairs and cylinder housings arranged in one piece by a housing shell, wherein the housing shell via a flange with the deck in a sealable connection stands for the separation of the lubricating oil-carrying crank chamber from a cylinder chamber associated coolant chamber.
  • a cylinder crankcase shown only as a construction principle, the use of different materials for the engine block and the shell is conceivable as a model for an operable internal combustion engine separates this cylinder crankcase, however.
  • DE 44 09 750 A1 shows and describes a model cylinder crankcase for a liquid-cooled internal combustion engine with a substantially consisting of magnesium housing with a plurality of cylinder tubes arranged in series cylinder insert.
  • the aluminum alloy cylinder insert encased in magnesium in the cylinder head end region has an enveloping wall surrounding the interconnected cylinder tubes for forming a coolant space, so that lubricating oil as a further liquid fuel is preferably guided in channels formed in the magnesium housing.
  • EP 0 751 289 B1 discloses and describes a cylinder crankcase for a liquid-cooled internal combustion engine, in which an engine block made of a ferrous material with bearing seats arranged on a deck on the one hand and cylinder tubes provided on the other hand is used in an aluminum housing produced by encapsulation.
  • the cylinder head not shown, screwed in the aluminum housing, whereas the bearing caps of the crankshaft bearing are bolted to the bearing blocks formed from the iron material.
  • the flow of power between the cylinder head and the crankshaft bearing caps is disadvantageous over materials with different thermal expansion values. This requires, for example, a cylinder head gasket with a particularly high pressure.
  • the invention is based on the object for a manufactured in composite cast cylinder crankcase made of an aluminum and a magnesium alloy with material-matched separate management required liquid operating materials show forces and moments safely receiving structure.
  • the advantage of the invention is to be seen in that on the one hand formed with coolant spaces engine block of an aluminum alloy receives the power flow between the cylinder head and the crankshaft bearing caps and this on the other hand when encapsulating a magnesium alloy for the housing on fillable openings and channels the aluminum engine block forms a rigid and torsion-resistant unit that is supported by targeted detail training of the magnesium housing advantageous.
  • a cylinder crankcase 1 for a liquid-cooled internal combustion engine not shown in detail comprises an aluminum alloy engine block 2 formed on a deck 3 crankshaft side molded bearing seats 4 and integrally arranged cylinder tubes 5, which with this integrally formed Hüll Domainn 6, 6 'cylinder-side coolant chambers. 7 Limit '7'.
  • the aluminum engine block 2 is cast in a housing 10 made of a magnesium alloy with a crankcase 11 bounding housing wall sections 12, 12 '.
  • the mutually opposite housing wall sections 12, 12 ' are connected to one another via cross connections 13, wherein a respective bearing block 4 is cast into the housing wall sections 12, 12' stiffening cross connections 13.
  • a respective bearing block 4 is cast into the housing wall sections 12, 12' stiffening cross connections 13.
  • shrink connections are advantageously achieved, which are the distribution of forces and moments on aluminum engine block 2 and magnesium housing 10 useful.
  • the exclusively for guiding the lubricating oil with oil channels 14, 15 formed magnesium housing 10 is stiffened in a first end region by means of an integrally arranged end-side shaft 16, in particular torsionsversteift.
  • second end region encloses the magnesium housing 10 on the aluminum engine block 2 via ribs 17 arranged threaded eyelets 18 which serve a releasable connection of a clutch or bell housing, not shown.
  • openings provided thereon are arranged distributedly thereon and provided with fillable channels, as described below.
  • the aluminum engine block 2 comprises the deck 3 and interconnected cylinder tubes 5, with which the envelope walls 6, 6 'delimit separate coolant chambers 7, 7' via the connected cylinder tubes 5.
  • the exhaust-side coolant chamber 7 ' is provided with an aluminum inlet nozzle 19 passing through the magnesium housing 10; furthermore, the air-inlet-side coolant chamber 7 has a drain riser 20 arranged in the first end region of the aluminum engine block 2, which is in communication with a cylinder head side port.
  • the cylinder tubes 5 and the enveloping walls 6, 6 'of the aluminum engine block 2 terminate flush with the magnesium housing 10 on the cylinder head side in a common sealing surface 21, with the magnesium housing for an additional connection close to the gasket 10 by means of enforceable during casting openings 22 in the shell walls 6, 6 'outside the sealing surface 21 screw pipes 8 connecting flanges 23 is additionally positively connected.
  • FIGS. 2 and 3 show that the screw pipes 8 are designed to overlap the enveloping walls 6, 6 'and are in force-conducting connection with the deck 3 via two webs 9 arranged at a distance from one another below the coolant chambers 7, 7' on the cylinder tubes 5.
  • both webs 9 with a cylinder tube portion on the one hand and a web-connecting partition 24 on the other hand a casting of the magnesium housing 10 to the aluminum engine block 2 fillable channel 25 - Figure 4 - form the positive-locking clamping of the magnesium housing 10 approximately half the height of the housing with the aluminum cylinder insert second
  • the bearing blocks 4 on the aluminum engine block 2 have a channel-like recess 26 in each case in both end faces for increasing the cross-section 13 of the magnesium housing 10 in regions.
  • crankshaft side boundaries 27 of the recesses 26 are arranged in a sufficient for a viable Lagerdeckelverschraubung 28 in the bearing blocks 4 distance from the bearing center plane of a split crankshaft bearing 29.
  • the storage chairs 4 have lateral extensions 30 with apertures 31 which can be filled by the casting material during the casting of the magnesium housing 10.
  • the magnesium housing 10 is clamped at the lower end with the aluminum engine block 2.
  • the cylinder tubes 5 have stiffening ribs 32 arranged approximately midway between the webs 9 of the screw pipes 8 between the deck 3 and the underside of the respective coolant chamber 7, 7 '. These stiffening ribs 32, which serve to stiffen the cylinder tubes 5, advantageously enlarge the surface of the aluminum engine block 2 for the material connection of the magnesium housing 10.
  • the bearing caps 4, not shown, bearing cap, not shown can be integrated in a bearing frame, not shown, wherein the crankshaft bearing 29 to achieve a low running clearance possibly formed from a ferrous castings include.
  • venting channels 33 and oil return channels 15 are provided, each having a transversely oriented to the machine longitudinal axis rectangular cross-section 34, wherein the walls of the Channels 15, 33 with housing longitudinal ribs 35 are in communication and in the connecting portions of channels and longitudinal ribs 35 designed for aluminum screws fferenbutzen 36 are provided for connecting motor support elements and / or ancillaries.
  • the magnesium housing 10 passing through pins 37 may be arranged with one screw thread for aluminum screws for attachment of separate facilities ( Figure 5) on one or more of the aluminum engine block 2 arranged.
  • the bearing blocks 4 receiving bearing frame is preferably also made of a magnesium alloy.
  • the inventively designed cylinder crankcase 1 is designed so that of the liquid supplies the cooling water is performed exclusively in aluminum parts, whereas the lubricating oil is mainly promoted in magnesium parts.
  • aluminum alloy is preferably thought of a eutectic or hypereutectic Alusil compound.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

A cylinder block and crankcase for a liquid-cooled internal-combustion engine is to be constructed by composite casting, a magnesium case being cast around an aluminum power unit block. The cylinder block and crankcase is conceived such that the aluminum power unit block is significantly used for the distribution of force between the cylinder head and the crankshaft bearing caps as well as for the guiding of the cooling water, in which case, the magnesium case is free of a cooling water guidance and predominantly used for the guiding of lubricating oil and, in addition, is correspondingly designed for the proportional stiffening against bending and torsion loads.

Description

Die Erfindung bezieht sich auf ein Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte Brennkraftmaschine.The invention relates to a cylinder crankcase for a liquid-cooled internal combustion engine.

Zur Gewichtsreduzierung eines Zylinderkurbelgehäuses ist es bekannt, den hochbelasteten, im wesentlichen aus den Zylindern mit unmittelbar oder mittelbar angeformten Kurbelwellen-Lagern gebildeten Triebwerksblock vorzugsweise aus einem höher belastbaren Werkstoff herzustellen und die geringer belasteten Gehäusewände gesondert aus einem leichteren, insbesondere dünnwandig verfertigten Material auszubilden unter Beachtung einer materialangepassten getrennten Führung für flüssige Betriebsstoffe.To reduce the weight of a cylinder crankcase, it is known to produce the highly loaded engine block formed essentially from the cylinders with directly or indirectly formed crankshaft bearings preferably made of a higher loadable material and form the less loaded housing walls separately from a lighter, in particular thin-walled fabric under consideration a material-adapted separate guide for liquid fuels.

Aus der DE 43 06 269 A1 ist ein Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte Brennkraftmaschine bekannt, bei dem ein Triebswerksblock mit an einem Deck kurbelwellenseitig angeformten Lagerstühlen und darüber einstückig angeordneten Zylinderrohren von einem Gehäusemantel umhüllt ist, wobei der Gehäusemantel über einen Flansch mit dem Deck in abdichtbarer Verbindung steht zur Trennung des schmierölführenden Kurbelraumes von einem den Zylinderrohren zugeordneten Kühlmittelraum. Für dieses lediglich als Bauprinzip dargestellte Zylinderkurbelgehäuse ist die Verwendung unterschiedlicher Materialien für den Triebwerksblock und die Ummantelung denkbar, als Vorbild für eine betriebsfähige Brennkraftmaschine scheidet dieses Zylinderkurbelgehäuse jedoch aus.From DE 43 06 269 A1, a cylinder crankcase for a liquid-cooled internal combustion engine is known, in which a drive block is wrapped on a deck crankshaft side molded bearing chairs and cylinder housings arranged in one piece by a housing shell, wherein the housing shell via a flange with the deck in a sealable connection stands for the separation of the lubricating oil-carrying crank chamber from a cylinder chamber associated coolant chamber. For this cylinder crankcase shown only as a construction principle, the use of different materials for the engine block and the shell is conceivable as a model for an operable internal combustion engine separates this cylinder crankcase, however.

Demgegenüber zeigt und beschreibt die DE 44 09 750 A1 ein vorbildhaftes Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte Brennkraftmaschine mit einem im wesentlichen aus Magnesium bestehenden Gehäuse mit einem mehrere in Reihe angeordnete Zylinderrohre umfassenden Zylindereinsatz. Zur materialangepassten, getrennten Führung flüssiger Betriebsstoffe weist der vom Magnesium umgossene Zylindereinsatz aus einer Aluminiumlegierung im zylinderkopfseitigen Endbereich eine die miteinander verbundenen Zylinderrohre umgebende Hüllwand zur Ausbildung eines Kühlmittelraumes auf, so dass Schmieröl als weiterer flüssiger Betriebsstoff vorzugsweise in im Magnesium-Gehäuse ausgebildeten Kanälen geführt ist. Zwar ist bei diesem bekannten Zylinderkurbelgehäuse sichergestellt, dass Kühlwasser als Kühlmittel nicht im Magnesium-Gehäuse geführt wird, jedoch ist dieses Magnesium-Gehäuse mit integrierten Lagerstühlen in leichtgewichtiger Bauweise für eine Brennkraftmaschine mit hoher Leistung wenig geeignet.In contrast, DE 44 09 750 A1 shows and describes a model cylinder crankcase for a liquid-cooled internal combustion engine with a substantially consisting of magnesium housing with a plurality of cylinder tubes arranged in series cylinder insert. For material-adapted, separate guidance of liquid operating materials, the aluminum alloy cylinder insert encased in magnesium in the cylinder head end region has an enveloping wall surrounding the interconnected cylinder tubes for forming a coolant space, so that lubricating oil as a further liquid fuel is preferably guided in channels formed in the magnesium housing. Although it is ensured in this known cylinder crankcase that cooling water is not performed as a coolant in the magnesium housing, but this magnesium housing with integrated storage chairs in lightweight construction for an internal combustion engine with high performance is not very suitable.

Demgegenüber zeigt und beschreibt die EP 0 751 289 B1 ein Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte Brennkraftmaschine, bei dem ein aus einem Eisenwerkstoff gefertigter Triebwerksblock mit an einem Deck einerseits angeordneten Lagerstühlen und andererseits vorgesehenen Zylinderrohren Verwendung findet in einem durch Umgießen hergestellten Aluminium-Gehäuse. Wie aus den Zeichnungen dieses Dokumentes hervorgeht, ist der nicht dargestellte Zylinderkopf im Aluminium-Gehäuse verschraubt, wogegen die Lagerdeckel der Kurbelwellenlager mit den aus dem Eisenwerkstoff gebildeten Lagerstühlen verschraubt sind. Damit verläuft der Kraftfluss zwischen Zylinderkopf und den Kurbelwellen-Lagerdeckeln in nachteiliger Weise über Materialien mit unterschiedlichen Wärmedehnungs-Werten. Dies erfordert beispielsweise eine Zylinderkopfdichtung mit besonders hoher Pressung.In contrast, EP 0 751 289 B1 discloses and describes a cylinder crankcase for a liquid-cooled internal combustion engine, in which an engine block made of a ferrous material with bearing seats arranged on a deck on the one hand and cylinder tubes provided on the other hand is used in an aluminum housing produced by encapsulation. As is apparent from the drawings of this document, the cylinder head, not shown, screwed in the aluminum housing, whereas the bearing caps of the crankshaft bearing are bolted to the bearing blocks formed from the iron material. Thus, the flow of power between the cylinder head and the crankshaft bearing caps is disadvantageous over materials with different thermal expansion values. This requires, for example, a cylinder head gasket with a particularly high pressure.

Diese Probleme sind bei einem Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte Brennkraftmaschine gemäß der DE 195 40 763 C1 vermieden, bei dem ein aus einem Eisenwerkstoff gefertigter Triebwerksblock mit an einem Deck einerseits angeordneten Lagestühlen und andererseits einstückig vorgesehenen Zylinderrohren zusätzlich relativ freistehende Schraubenpfeifen für die Zylinderkopfverschraubung vorgesehen sind. Dieser relativ schwergewichtige Triebwerksblock kann von einem Gehäuse aus einer Aluminium- oder Magnesium-Legierung umgossen sein, wobei jedoch für den Fall eines Magnesium-Gehäuses zur Vermeidung eines nachteiligen Kontaktes mit dem Kühlwasser ein aufwendiger Korrosionsschutz vorzusehen ist.These problems are avoided in a cylinder crankcase for a liquid-cooled internal combustion engine according to DE 195 40 763 C1, in which an engine block made of a ferrous material with arranged on a deck on the one hand position chairs and on the other hand integrally provided cylinder tubes are additionally provided relatively free-standing screw pipes for the cylinder head. This relatively heavy engine block can by a Enclosed housing of an aluminum or magnesium alloy, but in the case of a magnesium housing to avoid adverse contact with the cooling water is to provide a costly corrosion protection.

Der Erfindung liegt die Aufgabe zugrunde, für ein im Verbundguss hergestelltes Zylinderkurbelgehäuse aus einer Aluminium- und einer Magnesium-Legierung bei materialangepasst getrennter Führung erforderlicher flüssiger Betriebsstoffe eine Kräfte und Momente sicher aufnehmende Struktur aufzuzeigen.The invention is based on the object for a manufactured in composite cast cylinder crankcase made of an aluminum and a magnesium alloy with material-matched separate management required liquid operating materials show forces and moments safely receiving structure.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst.This object is achieved by claim 1.

Der Vorteil der Erfindung ist darin zu sehen, dass einerseits der mit Kühlmittelräumen ausgebildete Triebwerksblock aus einer Aluminium-Legierung den Kraftfluss zwischen dem Zylinderkopf und den Kurbelwellen-Lagerdeckeln aufnimmt und dieser andererseits beim Umguss einer Magnesium-Legierung für das Gehäuse über verfüllbare Durchbrechungen und Kanäle mit dem Alu-Triebwerksblock eine biegesteife und torsionsfeste Einheit bildet, die durch gezielte Detailausbildungen des Magnesium-Gehäuses vorteilhaft unterstützt ist.The advantage of the invention is to be seen in that on the one hand formed with coolant spaces engine block of an aluminum alloy receives the power flow between the cylinder head and the crankshaft bearing caps and this on the other hand when encapsulating a magnesium alloy for the housing on fillable openings and channels the aluminum engine block forms a rigid and torsion-resistant unit that is supported by targeted detail training of the magnesium housing advantageous.

Vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.Advantageous embodiments are described in the subclaims.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben. Es zeigt

Figur 1
ein Zylinderkurbelgehäuse in perspektivischer Ansicht,
Figur 2
einen erfindungsgemäßen Triebwerksblock in perspektivischer Ansicht,
Figur 3
einen Schnitt durch den Triebwerksblock gemäß der Linie III-III in Figur 2,
Figur 4
einen Schnitt gemäß der Linie IV-IV im Zylinderkurbelgehäuse gemäß Figur 1, und
Figur 5
einen Detail-Schnitt durch ein abgewandelt ausgebildetes Zylinderkurbelgehäuse.
The invention is described with reference to an embodiment shown in the drawing. It shows
FIG. 1
a cylinder crankcase in perspective view,
FIG. 2
an engine block according to the invention in perspective view,
FIG. 3
a section through the engine block according to the line III-III in Figure 2,
FIG. 4
a section along the line IV-IV in the cylinder crankcase according to Figure 1, and
FIG. 5
a detail section through a modified designed cylinder crankcase.

Ein Zylinderkurbelgehäuse 1 für eine nicht näher gezeigte, flüssigkeitsgekühlte Brennkraftmaschine umfasst einen aus einer Aluminium-Legierung gefertigten Triebwerksblock 2 mit an einem Deck 3 kurbelwellenseitig angeformten Lagerstühlen 4 und darüber einstückig angeordneten Zylinderrohren 5, die mit an diesen angeformten Hüllwänden 6, 6' zylinderkopfseitige Kühlmittelräume 7, 7' begrenzen.A cylinder crankcase 1 for a liquid-cooled internal combustion engine not shown in detail comprises an aluminum alloy engine block 2 formed on a deck 3 crankshaft side molded bearing seats 4 and integrally arranged cylinder tubes 5, which with this integrally formed Hüllwänden 6, 6 'cylinder-side coolant chambers. 7 Limit '7'.

In den relativ kurzen bzw. niedrigen Hüllwänden 6, 6' sind einer Zylinderkopfverschraubung dienende Schraubenpfeifen 8 ausgeformt, die mit dem Deck 3 über an den Zylinderrohren 5 angeordnete Stege 9 zu den Lagerstühlen 4 in kraftleitender Verbindung stehen. Damit ist in vorteilhafter Weise sicher gestellt, dass der Kraftfluss zwischen dem nicht gezeigten Zylinderkopf der nicht näher dargestellten Brennkraftmaschine und den mit den Lagerstühlen 4 korrespondierenden Lagerdeckeln ausschließlich in dem höherfestigen Alu-Triebwerksblock 2 verläuft.In the relatively short or low Hüllwänden 6, 6 'serving a cylinder head screw screw pipes 8 are formed, which are in force-conducting connection with the deck 3 via arranged on the cylinder tubes 5 webs 9 to the bearing blocks 4. This ensures in an advantageous manner that the power flow between the cylinder head, not shown, of the internal combustion engine, not shown, and the bearing caps 4 corresponding bearing caps runs exclusively in the higher-strength aluminum engine block 2.

Zur Erzielung eines leichtgewichtigen und trotzdem hochsteifen Zylinderkurbelgehäuses 1 ist der Alu-Triebwerksblock 2 in ein aus einer Magnesium-Legierung gefertigten Gehäuse 10 eingegossen mit einen Kurbelraum 11 begrenzenden Gehäusewandabschnitten 12, 12'.To achieve a lightweight yet highly rigid cylinder crankcase 1, the aluminum engine block 2 is cast in a housing 10 made of a magnesium alloy with a crankcase 11 bounding housing wall sections 12, 12 '.

Wie aus Figur 4 näher ersichtlich, sind die einander gegenüberliegenden Gehäusewandabschnitte 12, 12' miteinander über Querverbindungen 13 verbunden, wobei in die Gehäusewandabschnitte 12, 12' versteifenden Querverbindungen 13 ein jeweiliger Lagerstuhl 4 eingegossen ist. Zwischen den Querverbindungen 13 der Gehäusewandabschnitte 12, 12' und den umgossenen Lagerstühlen 4 werden in vorteilhafter Weise Schrumpfverbindungen erzielt, die der Verteilung von Kräften und Momenten auf Alu-Triebwerksblock 2 und Magnesium-Gehäuse 10 dienlich sind.As can be seen in more detail from FIG. 4, the mutually opposite housing wall sections 12, 12 'are connected to one another via cross connections 13, wherein a respective bearing block 4 is cast into the housing wall sections 12, 12' stiffening cross connections 13. Between the cross-connections 13 of the housing wall sections 12, 12 'and the encircling bearing blocks 4 shrink connections are advantageously achieved, which are the distribution of forces and moments on aluminum engine block 2 and magnesium housing 10 useful.

Das ausschließlich zur Führung des Schmieröles mit Ölkanälen 14, 15 ausgebildete Magnesium-Gehäuse 10 ist in einem ersten Endbereich mittels eines einstückig angeordneten stirnseitigen Schachtes 16 versteift, insbesondere torsionsversteift.The exclusively for guiding the lubricating oil with oil channels 14, 15 formed magnesium housing 10 is stiffened in a first end region by means of an integrally arranged end-side shaft 16, in particular torsionsversteift.

Im anderen, zweiten Endbereich umschließt das Magnesium-Gehäuse 10 am Alu-Triebwerksblock 2 über Rippen 17 abgestützt angeordnete Gewindeaugen 18, die einem lösbaren Anschluss einer nicht gezeigten Kupplungs- oder Getriebeglocke dienen.In the other, second end region encloses the magnesium housing 10 on the aluminum engine block 2 via ribs 17 arranged threaded eyelets 18 which serve a releasable connection of a clutch or bell housing, not shown.

Zur Erzielung einer zusätzlichen Verklammerung zwischen dem Magnesium-Gehäuse 10 und dem Alu-Triebwerksblock 2 sind an diesem verteilt angeordnet vorgesehene, von der Magnesium-Legierung beim Gießen durchsetzte Durchbrechungen und verfüllbare Kanäle zusätzlich vorgesehen, wie im weiteren beschrieben.In order to achieve additional clamping between the magnesium housing 10 and the aluminum engine block 2, openings provided thereon are arranged distributedly thereon and provided with fillable channels, as described below.

Wie aus Figur 2 ersichtlich, umfasst der Alu-Triebwerksblock 2 mit dem Deck 3 und miteinander verbundene Zylinderrohe 5, womit die Hüllwände 6, 6' über die verbundenen Zylinderrohre 5 voneinander gesonderte Kühlmittelräume 7, 7' begrenzen. Wie aus Figur 2 weiter ersichtlich, ist der abgasseitige Kühlmittelraum 7' mit einem das Magnesium-Gehäuse 10 durchsetzenden Alu-Zulaufstutzen 19 versehen, des weiteren weist der luftansaugseitige Kühlmittelraum 7 einen im ersten Endbereich des Alu-Triebwerkblockes 2 angeordneten Ablauf-Steigkanal 20 auf, der mit einem zylinderkopfseitigen Anschluss in Verbindung steht.As can be seen from FIG. 2, the aluminum engine block 2 comprises the deck 3 and interconnected cylinder tubes 5, with which the envelope walls 6, 6 'delimit separate coolant chambers 7, 7' via the connected cylinder tubes 5. 2, the exhaust-side coolant chamber 7 'is provided with an aluminum inlet nozzle 19 passing through the magnesium housing 10; furthermore, the air-inlet-side coolant chamber 7 has a drain riser 20 arranged in the first end region of the aluminum engine block 2, which is in communication with a cylinder head side port.

Wie aus den Figuren 1 und 4 erkennbar, enden die Zylinderrohre 5 und die Hüllwände 6, 6' des Alu-Triebwerksblockes 2 mit dem Magnesium-Gehäuse 10 zylinderkopfseitig bündig in einer gemeinsamen Dichtfläche 21, wobei für eine zusätzliche, dichtflächennahe Anbindung das Magnesium-Gehäuse 10 mittels beim Gießen durchsetzbarer Durchbrechungen 22 in auf den Hüllwänden 6, 6' außenseitig unter der Dichtfläche 21 Schraubenpfeifen 8 verbindenden Flanschen 23 zusätzlich formschlüssig verbunden ist.As can be seen from FIGS. 1 and 4, the cylinder tubes 5 and the enveloping walls 6, 6 'of the aluminum engine block 2 terminate flush with the magnesium housing 10 on the cylinder head side in a common sealing surface 21, with the magnesium housing for an additional connection close to the gasket 10 by means of enforceable during casting openings 22 in the shell walls 6, 6 'outside the sealing surface 21 screw pipes 8 connecting flanges 23 is additionally positively connected.

Die Figuren 2 und 3 zeigen, dass die Schraubenpfeifen 8 die Hüllwände 6, 6' deckseitig überstehend ausgebildet sind und jeweils über zwei unterhalb der Kühlmittelräume 7, 7' an den Zylinderrohren 5 gegenseitig beabstandet angeordnete Stege 9 mit dem Deck 3 in kraftleitender Verbindung stehen, wobei beide Stege 9 mit einem Zylinderrohrabschnitt einerseits und einer stegverbindenden Zwischenwand 24 andererseits einen beim Gießen des Magnesium-Gehäuses 10 um den Alu-Triebwerksblock 2 vom Gießmaterial verfüllbaren Kanal 25 - Figur 4 - bilden zur formschlüssigen Verklammerung des Magnesium-Gehäuses 10 etwa auf halber Gehäusehöhe mit dem Alu-Zylindereinsatz 2.FIGS. 2 and 3 show that the screw pipes 8 are designed to overlap the enveloping walls 6, 6 'and are in force-conducting connection with the deck 3 via two webs 9 arranged at a distance from one another below the coolant chambers 7, 7' on the cylinder tubes 5. wherein both webs 9 with a cylinder tube portion on the one hand and a web-connecting partition 24 on the other hand, a casting of the magnesium housing 10 to the aluminum engine block 2 fillable channel 25 - Figure 4 - form the positive-locking clamping of the magnesium housing 10 approximately half the height of the housing with the aluminum cylinder insert second

Wie insbesondere aus Figur 2 ersichtlich, weisen die Lagerstühle 4 am Alu-Triebwerksblock 2 zur bereichsweisen Querschnittsteigerung der Querverbindungen 13 des Magnesium-Gehäuses 10 jeweils in beiden Stirnseiten eine rinnenartige Vertiefung 26 auf, womit in vorteilhafter Weise querschnittsstarke Gurte in den Querverbindungen 13 zur vorteilhaften Aussteifung der Gehäusewandabschnitte 12, 12' des Gehäuses 10 erzielt sind. Im Hinblick auf die Lagerdeckelverschraubungen in den Alu-Lagerstühlen 4 sind kurbelwellenseitige Begrenzungen 27 der Vertiefungen 26 in einem für eine tragfähige Lagerdeckelverschraubung 28 in den Lagerstühlen 4 ausreichenden Abstand von der Lagermittenebene eines geteilten Kurbelwellenlagers 29 angeordnet.As can be seen in particular from FIG. 2, the bearing blocks 4 on the aluminum engine block 2 have a channel-like recess 26 in each case in both end faces for increasing the cross-section 13 of the magnesium housing 10 in regions. This advantageously provides cross-strapped straps in the transverse connections 13 for advantageous stiffening the housing wall portions 12, 12 'of the housing 10 are achieved. With regard to the Lagerdeckelverschraubungen in the aluminum storage chairs 4 crankshaft side boundaries 27 of the recesses 26 are arranged in a sufficient for a viable Lagerdeckelverschraubung 28 in the bearing blocks 4 distance from the bearing center plane of a split crankshaft bearing 29.

Zur Steigerung der formschlüssigen Verklammerung der Querverbindungen 13 des Magnesium-Gehäuses 10 mit den Alu-Lagerstühlen 4 weisen die Lagerstühle 4 gemäß Figur 2 seitliche Fortsätze 30 auf mit Durchbrechungen 31, die beim Gießen des Magnesium-Gehäuses 10 vom Gussmaterial verfüllbar sind. Mit dieser Ausgestaltung ist das Magnesium-Gehäuse 10 auch am unteren Ende mit dem Alu-Triebwerksblock 2 verklammert.To increase the positive locking of the transverse connections 13 of the magnesium housing 10 with the aluminum storage chairs 4, the storage chairs 4 according to FIG. 2 have lateral extensions 30 with apertures 31 which can be filled by the casting material during the casting of the magnesium housing 10. With this embodiment, the magnesium housing 10 is clamped at the lower end with the aluminum engine block 2.

Wie insbesondere aus Figur 3 erkennbar, weisen die Zylinderrohre 5 zwischen dem Deck 3 und der Unterseite des jeweiligen Kühlmittelraumes 7, 7' etwa mittig zwischen den Stegen 9 der Schraubenpfeifen 8 angeordnete Versteifungsrippen 32 auf. Diese einer Versteifung der Zylinderrohre 5 dienenden Versteifungsrippen 32 vergrößern in vorteilhafter Weise die Oberfläche des Alu-Triebwerksblockes 2 zur stoffschlüssigen Anbindung des Magnesium-Gehäuses 10.As can be seen in particular from FIG. 3, the cylinder tubes 5 have stiffening ribs 32 arranged approximately midway between the webs 9 of the screw pipes 8 between the deck 3 and the underside of the respective coolant chamber 7, 7 '. These stiffening ribs 32, which serve to stiffen the cylinder tubes 5, advantageously enlarge the surface of the aluminum engine block 2 for the material connection of the magnesium housing 10.

Zur zusätzlichen Aussteifung bzw. Versteifung des Zylinderkurbelgehäuses 1 können die mit den Lagerstühlen 4 korrespondierenden, nicht gezeigten Lagerdeckel in einem nicht dargestellten Lagerrahmen integriert sein, wobei die Kurbelwellenlager 29 zur Erzielung eines geringen Laufspieles ggf. aus einem Eisenwerkstoff gebildete Eingussteile umfassen.For additional stiffening or stiffening of the cylinder crankcase 1, the bearing caps 4, not shown, bearing cap, not shown, can be integrated in a bearing frame, not shown, wherein the crankshaft bearing 29 to achieve a low running clearance possibly formed from a ferrous castings include.

Eine weitere Versteifung gegen Biege- und Torsionsbelastungen ist schließlich dadurch erreicht, dass im Magnesium-Gehäuse 10 über die beiden Längsseiten verteilt angeordnete Entlüftungskanäle 33 und Ölrücklaufkanäle 15 vorgesehen sind, die jeweils einen quer zur Maschinenlängsachse ausgerichteten Rechteck-Querschnitt 34 aufweisen, wobei die Wandungen der Kanäle 15, 33 mit Gehäuse-Längsrippen 35 in Verbindung stehen und in den Verbindungsbereichen von Kanälen und Längsrippen 35 für Alu-Schrauben ausgelegte Schraubenbutzen 36 zum Anschluss von Motor-Tragelementen und/oder Nebenaggregaten vorgesehen sind.A further stiffening against bending and torsional loads is finally achieved in that in the magnesium housing 10 distributed over the two longitudinal sides arranged venting channels 33 and oil return channels 15 are provided, each having a transversely oriented to the machine longitudinal axis rectangular cross-section 34, wherein the walls of the Channels 15, 33 with housing longitudinal ribs 35 are in communication and in the connecting portions of channels and longitudinal ribs 35 designed for aluminum screws Schraubenbutzen 36 are provided for connecting motor support elements and / or ancillaries.

Zur Erzielung höher belastbarer Anschlussstellen können an einem oder mehreren der am Alu-Triebwerksblock 2 angeordneten Lagerstühle 4 seitlich gerichtete, das Magnesium-Gehäuse 10 durchsetzende Zapfen 37 angeordnet sein mit jeweils einem Einschraubgewinde für Alu-Schrauben zur Befestigung gesonderter Einrichtungen (Figur 5).To achieve higher load bearing points 4 laterally directed, the magnesium housing 10 passing through pins 37 may be arranged with one screw thread for aluminum screws for attachment of separate facilities (Figure 5) on one or more of the aluminum engine block 2 arranged.

Schließlich kann zur Erzielung einer materialeinheitlichen Dichtfläche 21 auch vorgesehen sein, dass der Alu-Triebwerksblock 2 an den Hüllwänden 6, 6' mit den Zylinderrohren 5 bündig gestaltete, das Magnesium-Gehäuse 10 überdeckende Dichtflansche 38 aufweist.Finally, in order to achieve a material-uniform sealing surface 21, provision may also be made for the aluminum engine block 2 to have flush-mounted sealing flanges 38 on the enveloping walls 6, 6 'with the cylinder tubes 5, covering the magnesium housing 10.

Der weiter vorne genannte, die Lagerstühle 4 aufnehmende Lagerrahmen ist vorzugsweise auch aus einer Magnesium-Legierung.The above-mentioned, the bearing blocks 4 receiving bearing frame is preferably also made of a magnesium alloy.

Das erfindungsgemäß gestaltete Zylinderkurbelgehäuse 1 ist so konzipiert, dass von den flüssigen Betriebsstoffen das Kühlwasser ausschließlich in Aluminium-Teilen geführt ist, wogegen das Schmieröl überwiegend in Magnesium-Teilen gefördert ist.The inventively designed cylinder crankcase 1 is designed so that of the liquid supplies the cooling water is performed exclusively in aluminum parts, whereas the lubricating oil is mainly promoted in magnesium parts.

Als Aluminium-Legierung ist vorzugsweise an eine eutektische oder übereutektische Alusil-Verbindung gedacht.As aluminum alloy is preferably thought of a eutectic or hypereutectic Alusil compound.

Claims (11)

  1. A cylinder crankcase for a liquid-cooled internal combustion engine,
    - comprising an engine block (2) made of an aluminium alloy with bearing blocks (4) integrally formed on a deck (3) on the crankshaft side and cylinder pipes (5) disposed above the integral unit and,
    - via integrally moulded and casing walls (6, 6'), bounding coolant chambers (7, 7') on the cylinder-head side, wherein
    - screw holes (8) for screwing the cylinder head, formed in relatively short or low encasing walls (6, 6'), are connected to the deck (3) for transmitting forces via webs (9) disposed on the cylinder pipes (5), and
    - the aluminium engine block (2) is cast in a casing (10) made of a magnesium alloy, with wall portions (12, 12') bounding a crank chamber (11) and
    - connected to one another via transverse connections (13) with bedded-in bearing blocks (4), and
    - the magnesium casing (10), formed with oil ducts (14, 15), is reinforced in a first end region via an integrally formed end-face shaft (16) and
    - in the other, second end region the magnesium casing comprises threaded lugs (18) supported on the aluminium engine block (2) by ribs (17) for releasably connecting a clutch housing or gear housing, and finally
    - the magnesium casing (10) is additionally connected to the aluminium engine block (2) by fillable ducts and by apertures distributed on the engine block and flowed through by the magnesium alloy.
  2. A cylinder crankcase according to claim 1, characterised in that
    - the aluminium engine block (2) comprises cylinder pipes (5) connected to the deck (3) and to one another and
    - the encasing walls (6, 6'), via cylinder pipes suitably connected in portions, bound coolant chambers (7, 7') separated from one another, wherein
    - the coolant chamber (7') on the exhaust side comprises aluminium supply nozzles (19) extending through the magnesium casing (10) and
    - the coolant chamber (7) on the air intake side comprises a discharge uptake (20) disposed in the first end region of the aluminium engine block (2).
  3. A cylinder crankcase according to claims 1 and 2, characterised in that
    - the cylinder pipes (5) and the encasing walls (6, 6') of the aluminium engine block (2) end in a common sealing surface (21) flush with the magnesium casing (10) on the cylinder-head side, wherein
    - the magnesium casing (10) is additionally positively connected by apertures (22), flowable through during casting, in flanges (23) connecting screw holes (8) on the encasing walls (6, 6'), externally under the sealing surface (21).
  4. A cylinder crankcase according to claims 1 to 3, characterised in that
    - the screw holes (8) project above the encasing walls (6, 6') on the deck side and
    - are connected for transmitting force to the deck (3) via respective pairs of webs (9) spaced apart under the coolant chambers (7, 7') on the cylinder tubes (5), wherein
    - the two webs (9), together with a cylinder-pipe portion on the one hand and a web-connecting partition (24) on the other hand, form a duct (25) fillable with casting material round the aluminium engine block (2) when the magnesium casing (10) is cast, for additional positive clamping of the casing (10) to the cylinder insert (2).
  5. A cylinder crankcase according to one or more of claims 1 to 4,
    characterised in that
    - in order to increase the cross-section at places on the transverse connections (13) of the magnesium casing (10), each bearing block (4) is formed in both end faces with a channel-like recess (26), wherein
    - boundaries (27) of the recesses (26) on the crankside-bearing side are disposed at a sufficient distance from the centre plane of a divided crankshaft bearing (29) for load-bearing support of the crankcase screws (28) in the bearing blocks (4).
  6. A cylinder crankcase according to claim 5, characterised in that
    - bearing blocks (4) have lateral projections (30) with apertures (31) which
    - are fillable with cast material when the magnesium casing (10) is cast, in order positively to clamp the transverse connections (13) of the magnesium casing (10) to the aluminium bearing blocks (4).
  7. A cylinder crankcase according to one or more of claims 1 to 6, characterised in that the cylinder pipes (5), between the deck (3) and the underside of the respective coolant chamber (7, 7'), have reinforcing ribs (32) disposed approximately centrally between the pairs of webs (9) of the screw holes (8).
  8. A cylinder crankcase according to one or more of claims 1 to 7,
    characterised in that
    - bearing covers corresponding to the bearing blocks (4) are incorporated in a bearing frame (bedplate) and the crankshaft bearings (29) surround bedded-in parts optionally made of a ferrous material.
  9. A cylinder crankcase according to one or more of claims 1 to 8,
    characterised in that
    - venting and oil return ducts (33, 15) are provided in the magnesium casing (10) and distributed over the two longitudinal sides,
    - each duct having a rectangular cross-section (34) aligned transversely of the longitudinal axis of the machine, wherein
    - the walls of the ducts (15, 33) are connected to longitudinal ribs (35) of the casing and
    - are provided in the connecting regions of two screw pockets (36) designed for aluminium screws, for connecting engine-bearing elements and/or auxiliary units.
  10. A cylinder crankcase according to one or more of claims 1 to 9, characterised in that laterally extending plugs (37) through the magnesium casing (10) are disposed on one or more of the bearing blocks (4) on the aluminium engine block (2), each with a screwing-in thread especially for aluminium screws for fastening separate devices.
  11. A cylinder crankcase according to one or more of claims 1 to 10, characterised in that the aluminium engine block (2) has sealing surfaces (38) on the encasing walls (6, 6'), flush with the cylinder tubes (5) and extending over the magnesium casing (10).
EP02700217A 2001-03-14 2002-02-08 Cylinder - crankcase of a liquid cooled internal combustion engine Expired - Lifetime EP1368562B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10112132A DE10112132A1 (en) 2001-03-14 2001-03-14 Cylinder crankcase for a liquid-cooled internal combustion engine
DE10112132 2001-03-14
PCT/EP2002/001313 WO2002073021A1 (en) 2001-03-14 2002-02-08 Zylinderkurbelgehäuse für eine flüssigkeitsgekühlte brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1368562A1 EP1368562A1 (en) 2003-12-10
EP1368562B1 true EP1368562B1 (en) 2007-04-04

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US (1) US6976466B2 (en)
EP (1) EP1368562B1 (en)
JP (1) JP4078207B2 (en)
CN (1) CN1219966C (en)
AT (1) ATE358771T1 (en)
DE (2) DE10112132A1 (en)
ES (1) ES2281502T3 (en)
WO (1) WO2002073021A1 (en)

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AT3675U1 (en) * 1999-05-04 2000-06-26 Avl List Gmbh CYLINDER CRANKCASE FOR AN INTERNAL COMBUSTION ENGINE
AT3760U1 (en) 1999-08-19 2000-07-25 Avl List Gmbh CYLINDER CRANKCASE FOR AN INTERNAL COMBUSTION ENGINE
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016113682A1 (en) 2016-07-25 2018-01-25 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cylinder crankcase in lightweight construction for internal combustion engines

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CN1219966C (en) 2005-09-21
EP1368562A1 (en) 2003-12-10
JP4078207B2 (en) 2008-04-23
WO2002073021A1 (en) 2002-09-19
DE50209865D1 (en) 2007-05-16
US6976466B2 (en) 2005-12-20
CN1457389A (en) 2003-11-19
ATE358771T1 (en) 2007-04-15
ES2281502T3 (en) 2007-10-01
US20040035375A1 (en) 2004-02-26
DE10112132A1 (en) 2002-09-19
JP2004518870A (en) 2004-06-24

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