EP2113319A2 - Noyau de fusion destiné à la formation d'un canal de refroidissement - Google Patents

Noyau de fusion destiné à la formation d'un canal de refroidissement Download PDF

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Publication number
EP2113319A2
EP2113319A2 EP09005283A EP09005283A EP2113319A2 EP 2113319 A2 EP2113319 A2 EP 2113319A2 EP 09005283 A EP09005283 A EP 09005283A EP 09005283 A EP09005283 A EP 09005283A EP 2113319 A2 EP2113319 A2 EP 2113319A2
Authority
EP
European Patent Office
Prior art keywords
anformung
piston
casting core
cooling channel
oil
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
EP09005283A
Other languages
German (de)
English (en)
Other versions
EP2113319A3 (fr
EP2113319B1 (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 EP2113319A2 publication Critical patent/EP2113319A2/fr
Publication of EP2113319A3 publication Critical patent/EP2113319A3/fr
Application granted granted Critical
Publication of EP2113319B1 publication Critical patent/EP2113319B1/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
    • B22C9/105—Salt 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
    • 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 according to the preamble of claim 1.
  • Fig. 1 is a piston 1 with a piston head 2, with a integrally formed via a land 3 to the piston crown 2 ring section 4, with a connected to the ring section 4 shaft member 5 and with two pin bosses 6 and 7, on the one hand to the shaft member 5 and on the other hand with the ring section 4 (and, as in Fig. 1 not shown, are connected via a respective hub support with the piston head 2).
  • the piston 1 also has a molded into the piston head 2 combustion bowl 29.
  • Fig. 1 Is marked in Fig. 1 also a cooling channel 8, which is arranged in piston crown near, radially outside, circumferentially and forms an open ring.
  • the cooling channel 8 has at its beginning 12 an oil inlet 9, and in the region of its end 13 a first oil drain 10.
  • a second oil drain 11 is arranged on the oil inlet 9 and the first oil drain 10 opposite side of the piston 1.
  • the oil inlet 9 and the two oil drains 10 and 11 are aligned in the direction of the piston interior.
  • a bottom view of the piston 1 shows the oil inlet 9 near the pin boss 7 (in the region of the hub support) and the first oil drain 10 near the pin boss 6 (in the region of the hub support), wherein the oil inlet 9 and the first oil drain 10 on that Piston side are arranged, on which also the shaft element 5 is located.
  • the shaft element 5 can lie on the pressure side or on the counterpressure side of the piston 1.
  • the cooling channel 8 is viewed between the end 13 and the first oil drain 10 from the side (see Fig. 1 ) formed as a tapered towards the end 13 extension 14.
  • the piston bottom side cover 15 of the extension 14 is parallel to the piston head 2, and the bottom 16 facing away from the piston bottom is inclined at an angle to the piston head 2.
  • Fig. 1 are also the holes 30, 31 and 32 shown, which are introduced into the finished piston 1 to connect the oil inlet 9 and first and second oil drain 10 and 11 with the piston interior.
  • Fig. 2 the bottom view of the piston 1, is shown in addition to the pin bosses 6 and 7, the oil inlet 9, the first oil drain 10 and the second oil drain 11 of the cooling channel 8 with its extension 14.
  • Fig. 3 shows a casting core 17 in the form of an open ring, with the aid of the cooling channel 8 is made, and which consists of a solvable by means of water or by means of a special liquid material.
  • the casting core 17 consists of water-soluble salt or of sand, wherein a sand casting core 17 is given by means of a water-soluble binder for the casting sufficiently stable form.
  • the casting core 17 has in the region of its end 21 a first molding 18 for forming the first oil drain 10.
  • a second Anformung 19 for forming the second oil drain 11 is disposed on the opposite side of the end 21 of the casting core 17.
  • a third Anformung 20 between the first Anformung 18 and the end 21 of the casting core 17 with towards the end 21 of the casting core 17 towards tapered shape is used in casting the piston 1 of the formation of the extension 14 of the cooling channel 8 and has a top 25 which is parallel to a lying perpendicular to the axis of symmetry 26 of the casting core 17 level, and a bottom 27, which extends from the first Anformung 18 to the end 21 of the casting core 17 obliquely to this plane perpendicular to the axis of symmetry 26 level.
  • a fourth Anformung 24 is arranged over a quarter-circle-shaped core bend 23, which serves for the formation of the oil inlet 9 during casting of the piston 1.
  • the first, second and fourth Anformung 18, 19 and 24 are in this case on the underside of the casting core 17 and parallel to the axis of symmetry 26 of the casting core 17th
  • the casting core 17 When casting the piston 1, the casting core 17 is inserted into the casting mold and fixed at a certain distance from the bottom of the casting mold, whereby the thickness of the intended between the cooling channel 8 and piston crown 2 piston material is determined. After casting, the 1st, 2nd and 4th Anformung 18, 19 and 24 are drilled to form the ⁇ lzuhne- and ⁇ lablmann füre from the inner side of the piston forth and through these holes 30, 31, 32 ( Fig. 1 ) of the casting core 17 washed out with the aid of a suitable liquid. This liquid may be water if, as stated above, the casting core 17 is made of salt or of sand with a water-soluble binder.
  • the casting core 17 with its fourth, parallel to the axis of symmetry 26 Anformung 24 to form the oil inlet 9, with the adjoining, quarter-circular core bend 23 over which the 4th Anformung merges into the remaining casting core 17, and with its 3rd Anformung 20 to form the extension 14 of the cooling channel 8 results in the context of casting the piston 1 a cooling channel 8, which lies parallel to the axis of symmetry 26 oil inlet 9 regardless of the position of the piston 1 of a parallel to the axis of symmetry 26 of the cooling channel 8, the axis 33rd corresponds to the piston 1, directed oil jet can be taken well, thereby resulting in a very good degree of capture (feed efficiency of the cooling oil to the piston) results.
  • the quarter-circle-shaped core bend 23 of the casting core 17 leads at the cooling channel 8 to an equally shaped channel transition 28 (FIG. Fig. 1 ) between oil inlet 9 and the rest of the cooling channel 8.
  • the oil injected into the oil inlet 9 is deflected in a fluidically ideal manner and passed through the cooling channel 8 with increased flow velocity.
  • the inclined bottom 16 of the extension 14 then causes an improved flow back of the oil to then completely flow out of the first oil drain 10.
  • the created by the second Anformung 19 of the casting core 17 second oil drain 11 is optional and is formed only in the case in the cooling channel 8 that due to the cooling oil supply (volume flow, beam quality), the amount of oil in the cooling channel 8 is too large and thus a Flow obstruction or obstruction of the shaker effect of the cooling oil results. Since this would impair the cooling efficiency, a portion of the cooling oil is discharged through the second oil drain 11, so that the remainder of the oil can optimally cool the piston area between the second oil drain 11 and the end 13 of the cooling channel 8.
  • a larger distance between the oil inlet 9 and the first oil drain 10 is realized by means of a correspondingly shaped casting core 17, wherein ideally the oil inlet 9 and the first oil drain 10 in the hub supports of the pin bosses 6 and 7 are formed in the underside of the piston crown 2 because here are the necessary for the oil inlet 9 and the first oil drain 10 holes 30, 31 are in a by the lateral forces less highly loaded area of the piston 1, and the corresponding holes 30, 31 in connection with the hub connections constructive and strength side Optimized to be realized.
  • the piston In engine operation, the piston is deformed on the one hand under the action of the gas pressure in the combustion chamber, wherein the piston head 2 is deflected inwardly.
  • the piston Because of the very high temperatures prevailing in the piston, the piston experiences a further deformation, the piston crown bulging out and the diameter of the piston crown being increased.
  • act on the pressure and the counter-pressure side of the piston skirt in engine operation very large forces, which in particular deforms the lower, open end of the piston skirt oval.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (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)
EP09005283A 2008-04-22 2009-04-11 Noyau de fusion destiné à la formation d'un canal de refroidissement Not-in-force EP2113319B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008020231A DE102008020231A1 (de) 2008-04-22 2008-04-22 Gießkern zur Bildung eines Kühlkanals

Publications (3)

Publication Number Publication Date
EP2113319A2 true EP2113319A2 (fr) 2009-11-04
EP2113319A3 EP2113319A3 (fr) 2010-04-14
EP2113319B1 EP2113319B1 (fr) 2012-10-17

Family

ID=40941711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09005283A Not-in-force EP2113319B1 (fr) 2008-04-22 2009-04-11 Noyau de fusion destiné à la formation d'un canal de refroidissement

Country Status (3)

Country Link
US (1) US8079403B2 (fr)
EP (1) EP2113319B1 (fr)
DE (1) DE102008020231A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017085164A1 (fr) * 2015-11-19 2017-05-26 Ks Kolbenschmidt Gmbh Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002571A1 (de) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
DE102012203570A1 (de) * 2012-03-07 2013-09-12 Mahle International Gmbh Gegossener Leichtmetallkolben, insbesondere ein Aluminiumkolben
DE102012213558A1 (de) 2012-08-01 2014-02-06 Mahle International Gmbh Kolben
DE102012215543A1 (de) * 2012-08-31 2014-03-06 Mahle International Gmbh Gießform eines Kolbens
US8800526B2 (en) 2012-12-21 2014-08-12 Caterpillar, Inc. Instrumented piston for an internal combustion engine
JP2014185522A (ja) * 2013-03-21 2014-10-02 Hitachi Automotive Systems Ltd 内燃機関のピストン
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
DE102014008978A1 (de) 2014-06-17 2016-01-21 Daimler Ag Verfahren zum Herstellen eines Stahlkolbens und Stahlkolben für einen Verbrennungsmotor
US11248557B1 (en) * 2020-12-03 2022-02-15 Caterpillar Inc. Piston having oil gallery drain outlets biased in distribution to anti-thrust side

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006090159A (ja) * 2004-09-21 2006-04-06 Toyota Industries Corp 内燃機関用ピストン
JP2006090158A (ja) * 2004-09-21 2006-04-06 Toyota Industries Corp 内燃機関用ピストン
DE102006056013A1 (de) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Kühlkanalkolben
DE102007044105A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865179A (en) * 1972-12-15 1975-02-11 Audi Ag Piston for rotary piston machines and means for its manufacture
DE102005061075A1 (de) * 2005-12-21 2007-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu dessen Herstellung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006090159A (ja) * 2004-09-21 2006-04-06 Toyota Industries Corp 内燃機関用ピストン
JP2006090158A (ja) * 2004-09-21 2006-04-06 Toyota Industries Corp 内燃機関用ピストン
DE102006056013A1 (de) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Kühlkanalkolben
DE102007044105A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017085164A1 (fr) * 2015-11-19 2017-05-26 Ks Kolbenschmidt Gmbh Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer

Also Published As

Publication number Publication date
DE102008020231A1 (de) 2009-10-29
EP2113319A3 (fr) 2010-04-14
US20090261232A1 (en) 2009-10-22
US8079403B2 (en) 2011-12-20
EP2113319B1 (fr) 2012-10-17

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