EP0356768A2 - Pièces coulées en métaux légers, notamment pièces en moulage sous pression - Google Patents

Pièces coulées en métaux légers, notamment pièces en moulage sous pression Download PDF

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Publication number
EP0356768A2
EP0356768A2 EP89114611A EP89114611A EP0356768A2 EP 0356768 A2 EP0356768 A2 EP 0356768A2 EP 89114611 A EP89114611 A EP 89114611A EP 89114611 A EP89114611 A EP 89114611A EP 0356768 A2 EP0356768 A2 EP 0356768A2
Authority
EP
European Patent Office
Prior art keywords
casting
fastening means
molded body
light metal
piece
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
EP89114611A
Other languages
German (de)
English (en)
Other versions
EP0356768A3 (fr
EP0356768B1 (fr
Inventor
Paul Rosche
Klaus Dr. Eigenfeld
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
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0356768A2 publication Critical patent/EP0356768A2/fr
Publication of EP0356768A3 publication Critical patent/EP0356768A3/fr
Application granted granted Critical
Publication of EP0356768B1 publication Critical patent/EP0356768B1/fr
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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0085—Materials for constructing engines or their parts
    • 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
    • B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to a light metal casting, in particular a pressure casting, with a cast-in fastening means.
  • the arrangement of a fastener in a light metal casting by pouring serves to increase the strength of the connection between the casting and fastener.
  • this increase in strength is limited, in particular, by the grain formation when the casting cools in the vicinity of the fastening means.
  • the invention has for its object to show an arrangement in a light metal casting with cast-in fastener, with which a high-strength connection between the cast part and the cast-in fastener can be achieved.
  • a fiber insert provided in the casting, the fastening means being connected to an essentially fiber-free zone of the casting material adjacent to the fiber insert.
  • the fiber insert advantageously causes the formation of an adjacent zone with a very fine-grained structure when the casting cools, the fine-grained structure of the material in this zone has strength above the usual values.
  • this advantageously makes better use of the material of the fastening means, and on the other hand, the light metal casting is also more resilient.
  • the invention brings a particular increase in strength to a casting made from a magnesium alloy.
  • the fiber insert is advantageously designed as a simple molded body, in particular in the case of a fastening means with a radially symmetrical end region for anchoring in the casting.
  • the molded body comprises long fibers which are combined with short fibers in an end region facing the fastening means, the short fibers preferably being arranged transversely to the long fibers.
  • the strength of the light metal casting is advantageously increased via the long fibers, the course of the long fibers serving to even out the load in the light metal casting which is introduced via the fastening means.
  • the short fibers which are preferably arranged transversely to the long fibers, ensure that a large number of short fiber ends serve as grain formers for a fine-grained material structure in the zone between the fiber insert and the fastening means.
  • the short fibers which are preferably arranged transversely to the long fibers, have an advantageous action against a crystal dislocation of the material structure, so that in the zone between the fiber insert and the fastening means a strength exceeding the usual values of the casting material is certainly achieved.
  • the fastening means can are optimally used, the load introduced via the fastener is evened out over the long fibers in the casting. Overall, high material utilization is achieved.
  • a preferred embodiment of the shaped body described above is achieved in a further embodiment with a tubular shaped body made of long fibers, which is connected to short fibers in two, preferably aligned, fastening regions adjacent end regions.
  • a considerable part of the fuel flow through the fibers is advantageously conducted through the housing and local stress peaks in the casting are avoided.
  • the shaped body is stiff in accordance with a further feature of the last-mentioned proposal for placement in a casting mold.
  • the arrangement of fasteners according to the invention in connection with tubular fiber inserts can also be used for large, complex castings, such as, for example, in a machine housing, in particular made of a magnesium alloy.
  • Fiber hoses are known per se from DE-AS 1 282 245.
  • the invention is described with reference to a preferred exemplary embodiment of an internal combustion engine housing with a divided main bearing shown in cross section.
  • An internal combustion engine housing 1 comprises a crankcase 2 with a divided main bearing 3 for a crankshaft, not shown.
  • the main bearing 3 consists of a housing-integrated bearing part 4 in a transverse wall 5 of the crankcase 2 and a separate main bearing cover 6. This is attached to the transverse wall 5 by means of bolts 7, the bolts 7 engaging in the bearing part 4 adjacent threaded bushings 8.
  • the threaded bushings 8 are made of an iron material, while the internal combustion engine housing 1 is made of a magnesium alloy.
  • the threaded bushings 8 are arranged coaxially and at a radial distance in a tubular or tubular shaped body 9 made of fibers.
  • the molded body 9 serving as a fiber insert in the internal combustion engine housing 1 or in the transverse wall 5 comprises long fibers 10 which are combined with short fibers 11 in the area of the threaded bushing 8.
  • the short fibers 11 are arranged transversely to the long fibers 10 and at a radial distance from the threaded bushing 8. Between the short fibers 11 and the threaded bush 8 there remains an essentially fiber-free zone 12 consisting of the cast material or the magnesium alloy.
  • the radially inward end regions of the short fibers 11 act as grain formers during the cooling of the light metal casting and cause the formation of a very fine-grained casting material in this zone 12.
  • the casting material in zone 12 achieves significantly higher strength values than in the zone 12 in the other areas of the cast part or the internal combustion engine housing 1. This results in a higher load capacity of the threaded bushing 8 or the fastening means, or it can be better through smaller dimensions with constant loading of the material of the fastening means, such as the threaded bushing 8 and the screw bolt 7 be exploited.
  • the molded body 9 can have long fibers 10 of correspondingly long design in accordance with the respective load.
  • tie rods 13, which are arranged in alignment with the screw bolts 7 for the main bearing cover 6, are provided for connecting a cylinder head (not shown).
  • the aligned arrangement of a screw bolt 7 with a tie rod 13 enables the design of a tubular molded body 9 with continuous long fibers 10, the long fibers 10 also being connected to short fibers 11 in the connection area of the tie rods 13 to form a high-strength zone 12.
  • the tie rods 13, provided with a conventional thread can either be cast in the internal combustion engine housing 1 or can be mounted separately. In both cases, the load-bearing thread is arranged in the area of the high-strength, fine-grained zone.
  • the molded body 9 is stiff.

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)
  • Insertion Pins And Rivets (AREA)
EP19890114611 1988-09-02 1989-08-08 Pièces coulées en métaux légers, notamment pièces en moulage sous pression Expired - Lifetime EP0356768B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3829855 1988-09-02
DE3829855 1988-09-02

Publications (3)

Publication Number Publication Date
EP0356768A2 true EP0356768A2 (fr) 1990-03-07
EP0356768A3 EP0356768A3 (fr) 1991-04-10
EP0356768B1 EP0356768B1 (fr) 1993-04-28

Family

ID=6362156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890114611 Expired - Lifetime EP0356768B1 (fr) 1988-09-02 1989-08-08 Pièces coulées en métaux légers, notamment pièces en moulage sous pression

Country Status (2)

Country Link
EP (1) EP0356768B1 (fr)
DE (1) DE58904188D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499321A1 (fr) * 1991-02-15 1992-08-19 KOLBENSCHMIDT Aktiengesellschaft Piston à métal léger pour moteurs à combustion interne
EP0867247A1 (fr) * 1997-03-05 1998-09-30 UNITECH Aktiengesellschsft Procédé et appareil pour la fabrication de pieces de coulée composite

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324044C2 (de) * 1993-07-17 2003-06-26 Mahle Gmbh Zylinder-Kurbelgehäuse für einen Verbrennungsmotor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282245B (de) * 1965-05-31 1968-11-07 Siemens Ag Glasfaserverstaerkte Metallteile
JPS5630070A (en) * 1979-08-17 1981-03-26 Honda Motor Co Ltd Manufacture of fiber-reinforced composite material
DE3321212A1 (de) * 1983-06-11 1984-12-13 Kolbenschmidt AG, 7107 Neckarsulm Aus einem leichtmetallwerkstoff gegossenes bauteil fuer brennkraftmaschinen
GB8411074D0 (en) * 1984-05-01 1984-06-06 Ae Plc Reinforced pistons
DE3511555A1 (de) * 1985-03-29 1986-10-09 Kolbenschmidt AG, 7107 Neckarsulm Bauteile aus aluminium-legierungen fuer brennkraftmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499321A1 (fr) * 1991-02-15 1992-08-19 KOLBENSCHMIDT Aktiengesellschaft Piston à métal léger pour moteurs à combustion interne
EP0867247A1 (fr) * 1997-03-05 1998-09-30 UNITECH Aktiengesellschsft Procédé et appareil pour la fabrication de pieces de coulée composite
AT405622B (de) * 1997-03-05 1999-10-25 Tcg Unitech Ag Verfahren zur herstellung von hybridteilen

Also Published As

Publication number Publication date
EP0356768A3 (fr) 1991-04-10
DE58904188D1 (de) 1993-06-03
EP0356768B1 (fr) 1993-04-28

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