EP1636473A1 - 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

Info

Publication number
EP1636473A1
EP1636473A1 EP04738605A EP04738605A EP1636473A1 EP 1636473 A1 EP1636473 A1 EP 1636473A1 EP 04738605 A EP04738605 A EP 04738605A EP 04738605 A EP04738605 A EP 04738605A EP 1636473 A1 EP1636473 A1 EP 1636473A1
Authority
EP
European Patent Office
Prior art keywords
piston
area
hubs
window insert
salt
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
EP04738605A
Other languages
German (de)
English (en)
Other versions
EP1636473B2 (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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33546538&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1636473(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1636473A1 publication Critical patent/EP1636473A1/fr
Application granted granted Critical
Publication of EP1636473B1 publication Critical patent/EP1636473B1/fr
Publication of EP1636473B2 publication Critical patent/EP1636473B2/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 3.
  • a piston is known from the published patent application DE 199 22 809 A1, the pin hubs of which are molded onto a cylindrical upper area of the piston, are set back from the edge of the upper area, so that when the piston is poured into the underside of the overhang formed thereby, the pin hubs are recessed can be molded.
  • a casting mold is used, which contains a pivotable window insert with one casting core per recess, but which can only produce recesses from which the casting core can be pulled out without problems after casting.
  • the invention is based on the problem of molding recesses with undercuts in the underside of the upper region of the piston when casting a piston using a pivotable window insert, in order to reduce the weight of the piston as much as possible and also its center of mass shift as far as possible into the lower part of the piston.
  • 1 is a partially cut piston after casting with inserted salt molding, attached to a pivotable window insert,
  • Fig. 3 shows the partially cut piston after the salt molding is washed out
  • Fig. 4 is a bottom view of the piston according to the invention.
  • the piston 1 shows a piston 1 in half section, the left half of which shows a section of the piston lying on the longitudinal axis 2 of a piston pin, not shown, and the right half of which shows a side view of the piston 1, in which a coated region 3 of a piston skirt 4 can be seen ,
  • the piston 1 is designed as a box piston, that is, below a circular cylindrical upper area 5 that receives the piston rings, there is a lower area 6 that has an approximately box-shaped cross section, in which the hubs 7 and the box walls in the area of the hubs 7 to the piston center axis 8 are drawn in, and in which only the shaft wall sections lying in the region of the pressure side and the counter-pressure side have the shape of segments in a circle, the diameter of which 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 head. So that the center of gravity of the piston 1 is not displaced too far upwards in the direction of the combustion chamber trough 11 by these elevations 9 and 10, when the piston 1 is cast in the combustion chamber troughs 9, 10 have cutouts 12 which are open towards the lower region 6 of the piston 1 and also have undercuts 13 formed in the region between the hubs 7 and the upper region 5, which are nose-shaped in cross section in the present exemplary embodiment and are each oriented toward the piston center axis 8 , but which can also have any other shape which is suitable for reducing the weight of the piston.
  • the material saved here also shifts the center of gravity of the piston 1 in the direction of the hub 7.
  • the 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 molding 15 is applied to the window insert 14 before the piston 1 is cast, the shape of which is identical to the shape of the recess 12 including the undercut 13.
  • the Salt molded part 15 is fastened on the window insert 14 in a rotationally secure manner via two conical projections 16 arranged on the window insert 14, onto which the salt molded part 15 is placed.
  • the window insert 14 is shown in section in FIGS. 1 and 2, which is why only one of the two extensions 16 can be seen.
  • the piston blank 1 is cast with the window insert 14 pivoted in and the salt molding 15 fastened thereon.
  • the window insert 14 is pivoted clockwise together with the opening of the remaining casting mold, not shown in the figures, as shown in FIG. 2, the salt molding 15 detaching from the window insert 14 and remaining in the piston blank 1 in order to be subsequently washed out.
  • FIG. 3 shows the piston blank 1 shown in FIG. 3, which has the cutouts 12 with the undercuts 13, these cutouts 12, as also shown in FIG. 4, being subdivided by ribs 17, 17 'which improve the dimensional stability of the walls 18 of the exaggerations 9 and 10 serve.
  • This allows the walls 18 to be made very thin, in order thereby to achieve improved cooling of the upper region 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 cutouts 12, 12 'with the undercuts 13, 13' shown in broken lines, which in the present exemplary embodiment are each divided by two ribs 17, 17 '.
  • the shape and the arrangement of the ribs 17, 17 ' can be taken into account in a simple manner by a corresponding design of the salt molding 15.
  • the shape of the salt molding 15 corresponds to the negative shape of the cutouts 12, 12 'and undercuts 13, 13' shown in the figures.
  • Figures 1 and 2 show sectional views of the salt molding 15, which is formed in one piece and has cuts to form the ribs 17, 17 'shown in Figures 3 and 4, which correspond in shape and depth to the shape of the ribs 17 according to Figure 3 , and their arrangement corresponds to the arrangement of the ribs 17, 17 'according to Figure 4.

Abstract

L'invention concerne un piston (1) qui est composé d'une zone supérieure (5) sensiblement cylindrique creuse et d'une zone inférieure (6) présentant deux moyeux (7) qui sont décalés vers l'arrière en direction de l'axe central (8) du piston de sorte que des évidements (12, 12') ouverts en direction de la zone inférieure (6) peuvent être intégrés dans la zone supérieure (5) à proximité des moyeux (7). Ce faisant, pour mouler des contre-dépouilles (13, 13') dans la zone entre les moyeux (7) et la zone supérieure (5), on place une pièce moulée en sel (15) sur l'insert de fenêtre correspondant (14). Cette pièce moulée en sel permet de générer les évidements (12, 12') ainsi que les contre-dépouilles (13, 13') lors de la coulée du piston (1) et est éliminée par lavage après la coulée du piston (1).
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 true EP1636473A1 (fr) 2006-03-22
EP1636473B1 EP1636473B1 (fr) 2012-12-19
EP1636473B2 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)

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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
CN105579162B (zh) * 2013-09-27 2017-06-16 本田金属技术株式会社 活塞铸造方法和活塞铸造装置
KR101615274B1 (ko) * 2015-09-04 2016-04-25 동양피스톤 주식회사 피스톤 제조용 에코 금형 장치와 피스톤 제조용 금형 장치 및 피스톤 제조 방법
KR101634788B1 (ko) * 2015-09-04 2016-06-30 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
JP2006527325A (ja) 2006-11-30
KR101119174B1 (ko) 2012-02-21
DE10325917A1 (de) 2005-03-31
KR20060035615A (ko) 2006-04-26
EP1636473B2 (fr) 2016-03-16
JP4741479B2 (ja) 2011-08-03
WO2004111419B1 (fr) 2005-04-07
US20060118076A1 (en) 2006-06-08
US7213562B2 (en) 2007-05-08
BRPI0411089B1 (pt) 2015-07-28
WO2004111419A1 (fr) 2004-12-23
EP1636473B1 (fr) 2012-12-19
BRPI0411089A (pt) 2006-07-25

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