EP1439927B1 - Zylinderkurbelgehäuse mit einer zylinderlaufbuchse und giesswerkzeug - Google Patents

Zylinderkurbelgehäuse mit einer zylinderlaufbuchse und giesswerkzeug Download PDF

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Publication number
EP1439927B1
EP1439927B1 EP02774575A EP02774575A EP1439927B1 EP 1439927 B1 EP1439927 B1 EP 1439927B1 EP 02774575 A EP02774575 A EP 02774575A EP 02774575 A EP02774575 A EP 02774575A EP 1439927 B1 EP1439927 B1 EP 1439927B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
cylinder liner
mandrel
casting
piston
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
EP02774575A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1439927A1 (de
Inventor
Franz Rückert
Helmut Schäfer
Peter Stocker
Oliver Storz
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1439927A1 publication Critical patent/EP1439927A1/de
Application granted granted Critical
Publication of EP1439927B1 publication Critical patent/EP1439927B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 
    • F02F1/004—Cylinder liners
    • 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

Definitions

  • the invention relates to a cylinder crankcase after the The preamble of claim 1 and a casting tool according to claim Third
  • Cylinder crankcases are becoming increasingly weight-saving of aluminum alloys in various casting processes, preferred manufactured by die casting. Because aluminum alloys, the are well pourable, often along the tribological requirements the cylinder running surfaces do not correspond, are in These areas include local improvement measures Material properties met. One of these measures is the pouring of cylinder liners.
  • DE 44 38 550 C2 describes a crankcase with cylinder liners from hypereutectic aluminum-silicon alloys.
  • the alloys described there are on Due to their high silicon content, it is particularly resistant to wear.
  • such cylinder liners have a low specific weight on and what unlike cylinder liners iron-based is particularly beneficial to her coefficient of thermal expansion is closer to that of the A-aluminum casting alloy as the expansion coefficient of iron.
  • This temperature gradient which is between 50 ° C and 70 ° C is due to the thermal expansion of a light conical shape of the cylinder bore, which is characterized by narrowed down to the top. Therefore it is necessary the tolerances of the piston, in particular of the piston ring to be interpreted as that there is enough play in the lower area is and at the top of the gap occurring minimal remains.
  • EP 463 314 A1 describes a cylinder crankcase with a cylinder liner on aluminum-silicon basis.
  • the cylinder liner does not go completely over the entire Zyrlinderlauf requirements.
  • EP 463 314 does not describe any Possibility of solving the problem of cone formation and gives no indication about the positioning of the cylinder liner in the casting mold.
  • the solution to the problem consists in a cylinder crankcase according to claim 1 and in a casting tool according to claim 3.
  • the cylinder crankcase according to claim 1 preferably several cylinder bores, each with a cylinder liner are provided.
  • the cylinder crankcase is made from an aluminum casting alloy, the cylinder liner consists of a hypereutectic aluminum-silicon alloy.
  • the silicon content of the alloy is between 23% and 28%
  • the cylinder liner is such shortens them as close to one as possible lowest piston rings in the lower dead center of the piston ends.
  • the cylinder bore runs below the lower dead center ever after engine design about 20 mm to 50 mm further.
  • the surface the cylinder bore (cylinder surface) is in this Area formed by the aluminum die-casting alloy.
  • the aluminum die casting alloy (hereinafter simply referred to as aluminum) has a thermal expansion coefficient ⁇ of approximately 22 ⁇ 10 -6 K -1 .
  • the aluminum-silicon alloy of the cylinder liner has an ⁇ value of 15 ⁇ 10 -6 K -1 to 17 ⁇ 10 -6 K -1 . This leads to a higher relative material expansion in the lower region of the cylinder bore, below the cylinder liner. Due to the lower prevailing temperature in combination with a locally higher material expansion, the cone formation in the cylinder bore is largely compensated according to the task.
  • the cylinder liner ends as close as possible below the lowest piston ring in the lower dead center, so that the described effect of thermal expansion used advantageous becomes.
  • the extension of the cylinder liner over the lower Dead center will be depending on the prevailing temperature gradient certainly. Experiments have shown, however, that the advantageous effect of the invention is impaired, if the bush further than 20 mm below the bottom dead center ends.
  • a rectangular lower end edge the cylinder liner is also advantageous. From casting technology In practice, most cylinder liners have reasons on its lower outside a chamfer on. This bevel serves the melt guide during a casting process. The chamfer leads in the operating condition at axial pressure on the socket Radial forces in the area of the chamfer, which adversely affects the connection sleeve to crankcase affects.
  • Another component of the invention is a casting tool for producing a cylinder crankcase according to claim 3.
  • the casting tool has at least one quill, the Representation of the cylinder bore is suitable.
  • On the quill There is a cylinder liner from a hypereutectic Al-Si alloy.
  • the jack covers a maximum of 85% of Quill in such a way that in the upper area (in terms a cylinder head side) bears against a wall of the casting tool.
  • a sprue of the casting tool used to fill the casting tool used by a cast metal is attached so that a main flow direction of the cast metal is the quill of hers Bottom side (on the part of the later oil chamber) ago meets.
  • the socket By the shortening of the cylinder liner is the socket outside the main flow direction of the casting metal and is of the Quill and the tool wall shielded. This affects itself favorable to the connection of the socket to the component, since Turbulence upon impact of the casting metal on the socket be reduced.
  • a better connection between socket and Crankcase allows, among other benefits, higher pressures in the cylinder bore, in particular in a combustion chamber.
  • the cylinder liner is indeed covered with such tight tolerances that they are sufficiently solid for a casting process Quill is positioned, in a series production, however for an undisturbed production process a fixation of Socket on the quill appropriate.
  • the fixation can be done through a nose, which is the socket keeps at a distance to a lower mold wall.
  • the nose can For better demolding partially in a recess of Quill be sunk.
  • FIG. 1 shows a detail of a reciprocating piston engine 1 in the region of a cylinder crankcase 2 (crankcase) with a cylinder bore 7.
  • the cylinder bore 7 is axially partially formed by a cylinder liner 4, which is cast in the crankcase 2.
  • a piston 6 is guided, which is connected via a connecting rod 8 with a crankshaft, not shown.
  • the piston 6 strips in its movement with piston rings 10 to 10 '' the cylinder surface 14.
  • the crankcase has a parting surface 12 to a cylinder head, not shown.
  • the cylinder liner 4 extends in the cylinder bore. 7 until the lowest dead center of the lowest piston ring exceeded by 5 mm.
  • the surface of the cylinder liner 7 forms the cylinder running surface 14 in this area. 5 mm below the bottom dead center 11 of the lowest piston ring 10, the cylinder surface 14 'through the material formed of the crankcase.
  • FIG. 2 The operation of the measure according to the invention in the cylinder crankcase will be explained with reference to FIG. 2 .
  • Fig. 2 the up to an adjacent cylinder liner 4 'extended section of the cylinder crankcase 2 is shown with the exception of the piston 6.
  • a temperature gradient .DELTA.T prevails, wherein T1 at about 200 ° C is greater than T2 at about 140 ° C.
  • the material of the cylinder liner a hypereutectic aluminum-silicon alloy with 25% silicon (hereinafter called AlSi) has a thermal expansion coefficient ⁇ 1 of about 16 x 10 -6 K -1 .
  • FIG. 3 shows a detail of a casting tool 22 according to the invention with a schematic profile of a melt flow 26 of a cast metal.
  • the cast metal is an aluminum alloy (AlSi9Cu3), which is filled under pressure into the casting tool 22.
  • the flow 26 of the cast metal is directed into the narrow, approximately 3 mm wide web 36 between the cylinder liners 4, 4 '. In the narrow region of the web 36, the mass per unit time of the aluminum melt moved there is lower and less kinetic energy afflicted than in the region of the main melt stream 25, via which the volume filling of the casting tool takes place.
  • the cylinder liner 4 is replaced by a nose 32 against a upper wall 40 of the casting tool 22 is pressed.
  • the nose is 32 attached to a bottom 42 of the casting tool 22.
  • the Quill 24 has a recess 34 which when closing the casting tool 22 and the positioning of the quill 24 partially receives the nose 32.
  • a smaller part of the nose 32 is radial with respect to the sleeve 24 and forms the support portion 36 for the cylinder liner 4th
  • the support region 36 is chosen so wide that the depression, which he caused in the cast crankcase by subsequent editing can be compensated.
  • the advantages of this Arrangement is that the nose sized so large that they can not be during the casting process breaks off or is otherwise damaged and in that they is not shown in the geometry of the crankcase.
  • Fig. 4 the arrangement of the nose 32 and its supporting effect on the cylinder liner 4 is illustrated with reference to a three-dimensional section of a casting tool 22.
  • the nose 32 is sunk in a, not visible in Fig. 4 depression.
  • the sleeve 24, which has a slightly conical shape is moved in the direction of the arrow 44 from the cylinder liner 4.
  • a cylinder liner 28 is indicated by conventional design, which is exposed directly to the melt stream.
  • a chamfer 29 a deflection of the main melt stream 25 is prevented in the conventional arrangement.
  • the sleeve 24 comprises shortened cylindrical sleeve 4, are the advantages already described to avoid the cone achieved in the cylinder bore, also the connection between the cylinder liner 4 and the crankcase 2 improved.
  • the almost rectangular lower edge 15 of the cylinder liner 4 causes in the operating state of the engine 1 also, that the acting force F almost completely by the Crankcase 2 is received.
  • the cylinder liner have a chamfer 29, as shown by dashed lines in Fig. 3 Cylinder liner 28, this would be a radial Force component in the direction of the center of the cylinder bore to lead. This in turn can cause a conical deformation of the cylinder surface 14 result.
  • the socket is through the inventive design before setting in the illustrated Force direction F protected. To avoid this radial movement the jack also carries the through the inventive Casting tool 22 achieved better connection between the cylinder liner 4 and the crankcase 22 at.
  • Another advantage is in one, opposite the stand the technology better shield a water jacket, which in Fig. 2 by way of example and simplified by a cooling hole 18 between the cylinder liners 4 and 4 'is shown and an oil chamber 16. Due to the better connection between cylinder liner 4 and the crankcase 2 are microscopic Column 20 (which does not affect the functionality itself) reduced. Water passing through the bore 18 and possibly can get into the column 20 is through the almost rectangular lower edge 15 of the bushing 4th prevented from entering the oil chamber 16.

Landscapes

  • 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)
EP02774575A 2001-10-31 2002-09-06 Zylinderkurbelgehäuse mit einer zylinderlaufbuchse und giesswerkzeug Expired - Lifetime EP1439927B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10153720A DE10153720C2 (de) 2001-10-31 2001-10-31 Zylinderkurbelgehäuse mit einer Zylinderlaufbuchse und Gießwerkzeug
DE10153720 2001-10-31
PCT/EP2002/009980 WO2003037551A1 (de) 2001-10-31 2002-09-06 Zylinderkurbelgehäuse mit einer zylinderlaufbuchse und giesswerkzeug

Publications (2)

Publication Number Publication Date
EP1439927A1 EP1439927A1 (de) 2004-07-28
EP1439927B1 true EP1439927B1 (de) 2005-01-26

Family

ID=7704322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774575A Expired - Lifetime EP1439927B1 (de) 2001-10-31 2002-09-06 Zylinderkurbelgehäuse mit einer zylinderlaufbuchse und giesswerkzeug

Country Status (5)

Country Link
US (1) US20050061285A1 (enExample)
EP (1) EP1439927B1 (enExample)
JP (1) JP2005507475A (enExample)
DE (2) DE10153720C2 (enExample)
WO (1) WO2003037551A1 (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0503019B1 (pt) * 2005-07-22 2018-02-06 Whirlpool S.A. Conjunto de pistão e cilindro com folga diametral variável e cilindro para uso em conjuntos de pistão e cilindro com folga diametral variável
US7665440B2 (en) * 2006-06-05 2010-02-23 Slinger Manufacturing Company, Inc. Cylinder liners and methods for making cylinder liners
DE102007003135B3 (de) * 2007-01-16 2008-03-06 Peak Werkstoff Gmbh Verfahren zur Herstellung eines Zylinderkurbelgehäuses mit mehreren Zylinderlaufbuchsen sowie kurze Zylinderlaufbuchse mit daran festgelegtem Materialstreifen

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB600156A (en) * 1945-09-28 1948-04-01 Glacier Co Ltd Improvements in or relating to engine cylinders
US3021183A (en) * 1958-11-28 1962-02-13 Gould National Batteries Inc Cylinder and piston structures
US3033183A (en) * 1961-05-15 1962-05-08 Gen Motors Corp Cylinder liner
FR2537654B2 (fr) * 1982-06-17 1987-01-30 Pechiney Aluminium Perfectionnement des chemises de moteurs a base d'alliages d'aluminium et de grains de silicium calibres et leurs procedes d'obtention
JPS60155665A (ja) * 1984-01-24 1985-08-15 Mitsubishi Heavy Ind Ltd シリンダライナの製造方法
EP0299679B1 (en) * 1987-07-11 1992-10-14 Isuzu Motors Limited Cooling system for heat insulating engine
DE4020268C1 (enExample) * 1990-06-26 1991-08-14 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
US5303682A (en) * 1991-10-17 1994-04-19 Brunswick Corporation Cylinder bore liner and method of making the same
JPH06185401A (ja) * 1992-12-16 1994-07-05 Mitsubishi Motors Corp ライナレスシリンダブロック構造
US5302450A (en) * 1993-07-06 1994-04-12 Ford Motor Company Metal encapsulated solid lubricant coating system
DE4438550C2 (de) * 1994-10-28 2001-03-01 Daimler Chrysler Ag Verfahren zur Herstellung einer in ein Kurbelgehäuse einer Hubkolbenmaschine eingegossenen Zylinderlaufbüchse aus einer übereutektischen Aluminium-Silizium-Legierung
JPH09170487A (ja) * 1995-05-26 1997-06-30 Toyota Motor Corp シリンダブロックの製造方法
JPH09151782A (ja) * 1995-11-29 1997-06-10 Toyota Motor Corp シリンダブロックの製造方法
DE19634504A1 (de) * 1996-08-27 1997-12-04 Daimler Benz Ag In ein Leichtmetall-Gußteil einzugießender Rohling eines anderen Leichtmetallteiles und Verfahren zum Herstellen eines solchen Rohlinges
DE19904971A1 (de) * 1999-02-06 2000-08-31 Vaw Alucast Gmbh Verfahren und Vorrichtung für die Herstellung von Motorblöcken
DE19906026B4 (de) * 1999-02-12 2006-10-05 Audi Ag Vorrichtung zum Eingießen zumindest einer Buchse in ein Gehäuse
DE10009135A1 (de) * 2000-02-26 2001-08-30 Volkswagen Ag Laufbuchsen aus einer Aluminiumlegierung zum Eingießen in Zylinderblöcke aus Leichtmetall von Verbrennungsmotoren und Verfahren zu deren Herstellung und Einguß
DE10019793C1 (de) * 2000-04-20 2001-08-30 Federal Mogul Friedberg Gmbh Zylinderlaufbuchse für Verbrennungskraftmaschinen und Herstellungsverfahren

Also Published As

Publication number Publication date
US20050061285A1 (en) 2005-03-24
DE10153720A1 (de) 2003-05-15
EP1439927A1 (de) 2004-07-28
DE10153720C2 (de) 2003-08-21
DE50202150D1 (de) 2005-03-03
WO2003037551A1 (de) 2003-05-08
JP2005507475A (ja) 2005-03-17

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