EP2142323B1 - Noyau de coulée pour former un canal de refroidissement dans un piston produit par technique de fonderie - Google Patents

Noyau de coulée pour former un canal de refroidissement dans un piston produit par technique de fonderie Download PDF

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Publication number
EP2142323B1
EP2142323B1 EP08758029A EP08758029A EP2142323B1 EP 2142323 B1 EP2142323 B1 EP 2142323B1 EP 08758029 A EP08758029 A EP 08758029A EP 08758029 A EP08758029 A EP 08758029A EP 2142323 B1 EP2142323 B1 EP 2142323B1
Authority
EP
European Patent Office
Prior art keywords
piston
casting core
region
casting
cooling channel
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.)
Not-in-force
Application number
EP08758029A
Other languages
German (de)
English (en)
Other versions
EP2142323A1 (fr
Inventor
Helmut Kollotzek
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 International GmbH
Original Assignee
Mahle International 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
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2142323A1 publication Critical patent/EP2142323A1/fr
Application granted granted Critical
Publication of EP2142323B1 publication Critical patent/EP2142323B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

  • the invention relates to a casting core for forming a cooling channel in a piston produced by casting according to the preamble of claim 1.
  • a water-soluble salt core for forming a cooling channel in a cast piston for an internal combustion engine which is annular and has a region lying parallel to the piston axis, which forms the oil drain of the cooling channel and passes over a quarter-circle Kembiegung in the annular part of the cooling channel.
  • the salt core has a region arranged parallel to the piston axis, which forms the oil inlet of the cooling channel, wherein the salt core on the opposite side of this region has a notch for forming a tapered in the direction of the injected oil jet beam splitter.
  • the beam splitter has the function of dividing the oil jet into the halves of the cooling channel lying on both sides,
  • the division of the cooling oil into the two cooling channel halves depends both on the position of the piston relative to an oil jet that ejects the oil jet and on transverse accelerations experienced by the jet of oil due to movements of the engine equipped with the piston.
  • Fig. 1 shows a perspective view of a half-cut piston 1 for an internal combustion engine, which is produced by casting, wherein a casting core 2 made of a releasable material is poured with.
  • a casting core 2 made of a releasable material is poured with.
  • the G demkem 2 completely drawn, which is annular and arranged near the piston head 3 in the radially outer region of the piston 1.
  • the piston 1 can be made of aluminum or cast iron, while the soluble G discernkem 2 may consist of salt or sand, so that the casting core 2 can be washed out after the casting of the piston 1 with water or other suitable liquid from the piston 1 ,
  • the piston 1 is provided with a molded into the piston head 3 combustion bowl 4 and radially outboard near the piston with a ring portion 5, wherein the piston bottom 3 nearest groove 6 has an existing example of Niresist ring carrier 20 for a compression ring, not shown in the drawing.
  • the piston 1 has on the side facing away from the piston head 3 side of the piston 1 also two opposing pin bosses 7, 8, each with a pin bore 9, 10 and also the pin bosses 7, 8 interconnecting and integrally formed on the piston head 3 shaft elements, of which the representation of the piston 1 according to Fig. 1 only the shaft member 11 is visible.
  • the in Fig. 1 shown piston 1 is cut open so that the inlet opening 12 formed by the core 2 and main drain openings 13 of the cooling channel can be seen.
  • Fig. 2 is shown that the G confusekem 2 both in the region of the inlet opening 12 as well as in the region of the main drain opening 13 short portions 14, 15, which have at least approximately the same cross-sectional diameter, and each pass over a quarter-circular Kembiegung 17, 18 in the annular part of the casting core 2.
  • the region 14, which forms the inlet opening 12, at least approximately parallel to the piston axis 16.
  • the two regions 14 and 15 of the casting core 2 are arranged at a small distance from each other, in the present embodiment, approximately the cross-sectional diameter of the region 14 or 15 but maximum the double cross-sectional diameter of the range 14 or 15 corresponds.
  • the second region 14 opens into that end of the casting core 2, which forms the inlet opening 12 of the cooling channel.
  • the casting core 2 can have a further Kembiegung 19 over which the piston axis 16 parallel to the first region 15 of the G collectkemes 2 merges into the part of the G collectkemes 2, which forms the main drain opening 13, which in this case is aligned in that the cooling oil emerging therefrom, such as Fig. 1 reveals, in the direction of one in the Fig. 1 not shown piston pin splashes.
  • the cooling oil after cooling the piston 1 can be used to cool the bolt of the piston 1, and to lubricate the small connecting rod eye of a connecting rod connected to the piston.
  • the shape of the G confusekemes 2 in the region of the inlet opening 12 and in the region of the main drain opening 13 with the parallel to the piston axis 16 lying areas 14 and 15 and with the Kembiegept 17 to 19 has the advantage that cooling oil regardless of the position of the piston 1 of a
  • arranged in the crankshaft oil spray nozzle can be injected under high pressure into the oil inlet 12 formed by the casting core 2, wherein the oil spray nozzle is arranged so that it squirts the cooling oil parallel to the piston axis 16 and thereby injects into the inlet opening 12.
  • the oil then passes through the part of the cooling channel formed by the core bend 17 with little flow resistance in the annular part of the oil passage, passes through this quickly, and passes through the parts formed by the core bends 18 and 19 of the cooling channel with low flow resistance to the main drain opening 13, so that a large oil throughput is guaranteed, which leads to a comparison with the prior art improved cooling of the piston 1.
  • FIG. 3 illustrated embodiment of a casting core 21 has in comparison to the casting core 2 according to Fig. 2 a center region 26 facing away from the piston head 3, which forms a central discharge opening 22, and which is arranged on the side of the casting core 21 opposite the regions 14 and 15 'for the feed opening 12 and for the main drain opening 13.
  • the cross section of the entire casting core 21 has an oval shape whose ovality is in the direction of the piston axis 16.
  • the cooling channel formed by G confusekem 21 has the advantage that it opposes because of the additional, central drain opening 22 and because of in the direction of the first region 15 'increasing cross section of the introduced into the inlet opening 12 cooling oil a very low flow resistance, thereby reducing the amount of the cooling channel guided cooling oil continues to increase and the cooling of the piston 1 is improved.
  • the inlet opening 24 is formed oval-shaped, wherein the ovality is perpendicular to the piston radius 25.
  • This has the advantage that the arranged in the crankshaft oil spray nozzle, with the help of the cooling channel piston, the cooling oil is supplied, must not be aligned so that it squirts oil exclusively parallel to the piston axis 16.
  • the cooling oil can be obliquely, that is, injected at an acute angle to the piston axis 16 in the direction of inlet opening 24, wherein the oil spray nozzle must be aligned such that the oil jet, the inlet opening 24 regardless of the Position of the piston 1 between the top and bottom dead center hits.

Claims (5)

  1. Noyau de coulée soluble (2, 21, 23), en forme de cercle incomplet, destiné à former un canal de refroidissement recevant de l'huile de refroidissement, le canal de refroidissement étant placé dans un piston (1) fabriqué par coulée près d'une tête de piston (3) et le noyau de coulée (2, 21, 23), à l'une de ses extrémités, se poursuivant après un coude du noyau (18) ayant la forme d'un quart de cercle par une première zone (15, 15') qui forme une ouverture principale d'écoulement (13) du canal de refroidissement et qui est disposée parallèlement à un axe (16) qui est perpendiculaire au plan formé par le cercle incomplet du noyau de coulée (2, 21, 23), caractérisé en ce que le noyau de coulée (2, 21, 23), à son autre extrémité, se poursuit après un coude du noyau (17) ayant la forme d'un quart de cercle par une deuxième zone (14) disposée parallèlement à la première zone (15, 15') et dirigée dans la même direction que la première zone (15, 15'), la deuxième zone (14) constituant l'ouverture d'alimentation (12, 24) du canal de refroidissement.
  2. Noyau de coulée (2, 21, 23) selon la revendication 1, caractérisé par une zone centrale (26) destinée à former une ouverture d'écoulement centrale (22) opposée aux zones (14, 15, 15') formant l'ouverture d'alimentation (12, 24) et l'ouverture principale d'écoulement (13) et orientée dans la direction opposée à la tête de piston.
  3. Noyau de coulée (2) selon la revendication 1 ou 2, caractérisé en ce que la première et la deuxième partie (14, 15) du noyau de coulée (2) possèdent un diamètre en section transversale identique et sont écartées l'une de l'autre d'une distance égale au maximum au double du diamètre en section d'une des deux parties (14, 15).
  4. Noyau de coulée (21, 23) selon la revendication 1, caractérisé en ce que la section transversale du noyau de coulée (21, 23) augmente à partir de la partie centrale (26) en direction de la première partie (15').
  5. Noyau de coulée (2, 21, 23) selon l'une des revendications précédentes, caractérisé en ce que l'ouverture d'alimentation (12, 24) est de forme ovale, l'ovalité étant orientée perpendiculairement au rayon du piston (25).
EP08758029A 2007-04-27 2008-04-25 Noyau de coulée pour former un canal de refroidissement dans un piston produit par technique de fonderie Not-in-force EP2142323B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007019930 2007-04-27
DE102007044105A DE102007044105A1 (de) 2007-04-27 2007-09-15 Gießkern zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben
PCT/DE2008/000770 WO2008131754A1 (fr) 2007-04-27 2008-04-25 Noyau de coulée pour former un canal de refroidissement dans un piston produit par technique de fonderie

Publications (2)

Publication Number Publication Date
EP2142323A1 EP2142323A1 (fr) 2010-01-13
EP2142323B1 true EP2142323B1 (fr) 2012-10-03

Family

ID=39777626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08758029A Not-in-force EP2142323B1 (fr) 2007-04-27 2008-04-25 Noyau de coulée pour former un canal de refroidissement dans un piston produit par technique de fonderie

Country Status (7)

Country Link
US (1) US8122935B2 (fr)
EP (1) EP2142323B1 (fr)
JP (1) JP5185995B2 (fr)
CN (1) CN101668599B (fr)
BR (1) BRPI0810852A2 (fr)
DE (1) DE102007044105A1 (fr)
WO (1) WO2008131754A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020231A1 (de) 2008-04-22 2009-10-29 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals
DE102008002571A1 (de) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
CN102151794B (zh) * 2011-02-23 2013-10-23 江苏大学 一种活塞重力铸造方法及装置
DE102011076455A1 (de) 2011-05-25 2012-11-29 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals in einem Kolben
DE102011086411A1 (de) 2011-11-15 2013-05-16 Mahle International Gmbh Gießform für einen Kolben
DE102012213558A1 (de) * 2012-08-01 2014-02-06 Mahle International Gmbh Kolben
DE102012217939A1 (de) * 2012-10-01 2014-04-03 Mahle International Gmbh Verfahren zur Herstellung von Kernen für die gießtechnische Herstellung von Werkstücken
JP6050709B2 (ja) * 2013-03-22 2016-12-21 日立オートモティブシステムズ株式会社 内燃機関用ピストン
CN104353814B (zh) * 2014-10-28 2016-08-24 山东滨州渤海活塞股份有限公司 氧化铝纤维氧化钛颗粒增强内冷镶圈活塞毛坯制造方法
MX2018005970A (es) * 2015-11-19 2018-09-05 Ks Kolbenschmidt Gmbh Aberturas de admision y salida vaciadas para pistones de acero fundido y hierro fundido.
CN107191287A (zh) * 2017-06-06 2017-09-22 湖南江滨机器（集团）有限责任公司 一种活塞及活塞制造方法
CN109732045A (zh) * 2019-01-22 2019-05-10 共享智能铸造产业创新中心有限公司 一种型芯及其制造方法和使用方法
GB2578803B (en) * 2019-04-04 2020-12-16 Cox Powertrain Ltd Marine outboard motor with piston cooling gallery

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Also Published As

Publication number Publication date
US20100163203A1 (en) 2010-07-01
CN101668599B (zh) 2013-02-13
EP2142323A1 (fr) 2010-01-13
JP2010525221A (ja) 2010-07-22
US8122935B2 (en) 2012-02-28
WO2008131754A1 (fr) 2008-11-06
BRPI0810852A2 (pt) 2014-10-29
DE102007044105A1 (de) 2008-10-30
CN101668599A (zh) 2010-03-10
JP5185995B2 (ja) 2013-04-17

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