EP1636473B2 - Piston pour un moteur a combustion interne et procede de coulee pour sa production - Google Patents

Piston pour un moteur a combustion interne et procede de coulee pour sa production Download PDF

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Publication number
EP1636473B2
EP1636473B2 EP04738605.7A EP04738605A EP1636473B2 EP 1636473 B2 EP1636473 B2 EP 1636473B2 EP 04738605 A EP04738605 A EP 04738605A EP 1636473 B2 EP1636473 B2 EP 1636473B2
Authority
EP
European Patent Office
Prior art keywords
piston
casting
recesses
hubs
area
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 - Fee Related
Application number
EP04738605.7A
Other languages
German (de)
English (en)
Other versions
EP1636473A1 (fr
EP1636473B1 (fr
Inventor
Gottfried Schnaitmann
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.)
Mahle GmbH
Original Assignee
Mahle GmbH
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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Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1636473A1 publication Critical patent/EP1636473A1/fr
Publication of EP1636473B1 publication Critical patent/EP1636473B1/fr
Application granted granted Critical
Publication of EP1636473B2 publication Critical patent/EP1636473B2/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • 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
    • B22D19/0027—Cylinders, pistons 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
    • F02F3/00—Pistons 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49261—Piston making with assembly or composite article making by composite casting or molding

Definitions

  • the invention relates to a piston for an internal combustion engine according to the preamble of claim 1 and a method for its production according to the preamble of claim 2.
  • a piston is known whose formed on a cylindrically shaped, upper portion of the piston pin bosses are set back relative to the edge of the upper region, so that when pouring the piston in the bottom of the overhang formed thereby near the pin bosses recesses can be formed.
  • a mold is used which contains a pivotable window insert with a casting core per recess, but which can only produce those recesses from which the casting core can be easily removed after casting.
  • the disadvantage here is that a very expensive mechanism is required to keep the casting mold during casting of the piston exactly in the space provided and move away obliquely downwards from the piston after casting and pull out of the molding.
  • the known from the prior art molding no incisions, which allows a production of ribs in the recess, which brings about the further disadvantage that the piston known from the latter prior art has only a low mechanical strength.
  • the invention has the object to avoid the disadvantages of the cited prior art.
  • the problem is solved with the features in the characteristics of the main claim and the dependent claim.
  • An expedient embodiment of the invention is the subject of the dependent claim.
  • the subject matter of the second claim combines the advantages of a hinged window insert, which can be produced on casting technology simple way recesses for which linearly movable slide are unsuitable, with the advantages of a salt core, the unlimited potential for possibilities of shaping cavities in the piston offers.
  • a piston 1 is shown in half section, the left half of which lies on the longitudinal axis 2 of a piston pin, not shown, section of the piston and the right half of a side view of the piston 1, in which a coated portion 3 of a piston shaft 4 can be seen.
  • the piston 1 is designed as a box piston, ie, below a circular cylindrical and the piston rings receiving, upper portion 5 is a lower portion 6, which has an approximately box-shaped cross-section, in which the hubs 7 and the box walls in the region of the hubs 7 to the piston center axis are drawn in, and in which only the lying in the region of the pressure and the counterpressure side skirt wall sections in section have the shape of segments of a circle whose diameter corresponds to the piston diameter.
  • the piston 1 has two elevations 9 and 10, which are arranged on both sides of a combustion chamber trough 11 formed in the piston crown.
  • elevations 9 and 10 of the center of gravity of the piston 1 are during casting of the piston 1 in the combustion chamber troughs 9, 10 to the lower portion 6 of the piston 1 open recesses 12 and also in formed under the region between the hubs 7 and the upper region 5 undercuts 13, which in the present embodiment in cross-section nose-shaped and in each case to the piston central axis 8 are aligned, but may also have any other shape that is adapted to reduce the weight of the piston.
  • the mass center of gravity of the piston 1 in the direction of the hubs 7 is displaced by the material saved thereby.
  • the casting mold for casting the piston 1 has a pivotable window insert 14 for each of the recesses 12 to be produced in the two elevations 9 and 10.
  • a prefabricated salt mold part 15 is applied before the casting of the piston 1 on the window insert 14, the shape of which is identical to the shape of the recess 12 including the undercut 13.
  • Das Salt mold part 15 is secured against rotation on the window insert 14 via two conical projections 16 arranged on the window insert 14, onto which the salt mold part 15 is slipped.
  • the window insert 14 is shown in section, which is why only one of the two extensions 16 can be seen. With pivoted-in window insert 14 and salt molding 15 mounted thereon, the piston blank 1 is poured.
  • FIG. 3 illustrated piston blank 1 which has the recesses 12 with the undercuts 13, wherein these recesses 12, as well as in FIG. 4 are divided by ribs 17,17 ', which serve to improve the dimensional stability of the walls 18 of the elevations 9 and 10. This allows to make the walls 18 very thin, thereby achieving improved cooling of the upper portion 5 of the piston 1 by spraying with cooling oil.
  • the bottom view of the piston according to FIG. 4 shows the kidney-shaped configuration of the recesses 12, 12 'with the dashed lines undercuts 13, 13', which are divided in the present embodiment of two ribs 17, 17 '.
  • the shape and the arrangement of the ribs 17, 17 'in a simple manner by a corresponding design of the salt-molded part 15 are taken into account.
  • the shape of the salt mold part 15 corresponds to the negative shape shown in the figures of the recesses 12, 12 'and undercuts 13, 13'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (3)

  1. Piston (1) pour un moteur à combustion, constitué :
    - d'une région supérieure quasiment cylindrique circulaire (5) pour l'admission de rainures annulaires, et
    - d'une région inférieure (6) avec deux bossages (7) destinés à l'admission d'un boulon de piston et décalés en arrière par rapport à l'axe médian de piston (8),
    dans lequel des évidements (12, 12') ouverts vers la région inférieure (6), comportant des contre-dépouilles (13, 13') formées dans la région entre les bossages (7) et la région supérieure (5), sont prévus dans la région supérieure (5) dans la région des bossages (7),
    caractérisé en ce que les évidements (12, 12') sont divisés respectivement par au moins une côte (17, 17') agencée dans la direction radiale.
  2. Procédé de moulage pour la fabrication d'un piston, dans lequel un moule avec des inserts de fenêtre pivotants (14) sont utilisés respectivement pour la fabrication des évidements (12, 12'),
    avec les étapes de procédé suivantes :
    - lors du moulage du piston (1), fabrication de pièces moulées en sel (15) permettant de réaliser des évidements (12, 12') ainsi que des contre-dépouilles (13, 13') faisant saillie dans la région entre les bossages (7) et la région supérieure (5) du piston (1),
    - intégration d'entailles dans les pièces moulées en sel (15), pour la fabrication de côtes (17, 17') agencées dans les évidements (12, 12') et les contre-dépouilles (13, 13'), lors du moulage du piston (1),
    - fixation des pièces moulées en sel (15) sur les différents inserts de fenêtre (14),
    - moulage du piston (1),
    - pivotement des inserts de fenêtre (14) à distance du piston moulé fini (1), suite à quoi les pièces moulées en sel (15) se détachent des inserts de fenêtre et demeurent dans le piston, et
    - évacuation par rinçage des pièces moulées en sel (15) hors du piston (1).
  3. Procédé de moulage selon la revendication 2, caractérisé en ce que les inserts de fenêtre (14) comportent respectivement au moins deux prolongements coniques (16), sur lesquels sont enfoncées les pièces moulées en sel (15).
EP04738605.7A 2003-06-07 2004-06-07 Piston pour un moteur a combustion interne et procede de coulee pour sa production Expired - Fee Related EP1636473B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10325917A DE10325917A1 (de) 2003-06-07 2003-06-07 Kolben für einen Verbrennungsmotor und Gießverfahren zu dessen Herstellung
PCT/DE2004/001151 WO2004111419A1 (fr) 2003-06-07 2004-06-07 Piston pour un moteur a combustion interne et procede de coulee pour sa production

Publications (3)

Publication Number Publication Date
EP1636473A1 EP1636473A1 (fr) 2006-03-22
EP1636473B1 EP1636473B1 (fr) 2012-12-19
EP1636473B2 true EP1636473B2 (fr) 2016-03-16

Family

ID=33546538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04738605.7A Expired - Fee Related EP1636473B2 (fr) 2003-06-07 2004-06-07 Piston pour un moteur a combustion interne et procede de coulee pour sa production

Country Status (7)

Country Link
US (1) US7213562B2 (fr)
EP (1) EP1636473B2 (fr)
JP (1) JP4741479B2 (fr)
KR (1) KR101119174B1 (fr)
BR (1) BRPI0411089B1 (fr)
DE (1) DE10325917A1 (fr)
WO (1) WO2004111419A1 (fr)

Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
US20080128946A1 (en) * 2005-02-10 2008-06-05 Boye David J Mold assembly for lightweight pistons
JP2006258013A (ja) * 2005-03-18 2006-09-28 Toyota Motor Corp 内燃機関用のピストンおよびそのピストンを有する内燃機関
DE102010064078A1 (de) * 2010-12-23 2012-06-28 Federal-Mogul Nürnberg GmbH Gießvorrichtung für einen Kolben für einen Verbrennungsmotor und Verfahren zum Öffnen und/oder Schließen einer Gießvorrichtung
DE102011085448A1 (de) * 2011-10-28 2013-05-02 Ks Kolbenschmidt Gmbh Kolben und Pleuel für eine Brennkraftmaschine
DE102012203570A1 (de) * 2012-03-07 2013-09-12 Mahle International Gmbh Gegossener Leichtmetallkolben, insbesondere ein Aluminiumkolben
DE102012204480A1 (de) * 2012-03-21 2013-09-26 Mahle International Gmbh Verfahren zur Herstellung eines gekühlten Ringträgers
US8459332B1 (en) 2012-07-09 2013-06-11 Kevin M. O'Connor Piston outer panel mold and method of constructing a piston and forming an undercut cooling gallery of a piston therewith
DE102013013962A1 (de) * 2013-08-23 2015-02-26 Mahle International Gmbh Baueinheit aus einem Kolben und einer Anspritzdüse für einen Verbrennungsmotor
US9662707B2 (en) * 2013-09-27 2017-05-30 Honda Foundry Co., Ltd. Piston casting method and piston casting device
KR101634788B1 (ko) * 2015-09-04 2016-06-30 동양피스톤 주식회사 피스톤 제조용 에코 금형 장치와 피스톤 제조용 금형 장치 및 피스톤 제조 방법
KR101615274B1 (ko) * 2015-09-04 2016-04-25 동양피스톤 주식회사 피스톤 제조용 에코 금형 장치와 피스톤 제조용 금형 장치 및 피스톤 제조 방법
KR101896806B1 (ko) 2016-12-15 2018-09-07 현대자동차주식회사 인서트 링 용 알루미늄 합금, 이를 이용한 알루미늄 인서트 링 및 이를 이용한 피스톤 제조방법
SE543272C2 (en) 2019-03-06 2020-11-10 Husqvarna Ab Engine piston, engine, hand-held tool, and method of manufacturing an engine piston
CN111957899A (zh) * 2020-07-13 2020-11-20 华域科尔本施密特活塞有限公司 一种活塞轻量化结构的制备方法

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Also Published As

Publication number Publication date
KR101119174B1 (ko) 2012-02-21
WO2004111419B1 (fr) 2005-04-07
DE10325917A1 (de) 2005-03-31
US20060118076A1 (en) 2006-06-08
BRPI0411089B1 (pt) 2015-07-28
EP1636473A1 (fr) 2006-03-22
EP1636473B1 (fr) 2012-12-19
US7213562B2 (en) 2007-05-08
WO2004111419A1 (fr) 2004-12-23
JP2006527325A (ja) 2006-11-30
KR20060035615A (ko) 2006-04-26
JP4741479B2 (ja) 2011-08-03
BRPI0411089A (pt) 2006-07-25

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