EP1546536B1 - Piston monobloc a conduite de refroidissement pour moteur a combustion interne - Google Patents

Piston monobloc a conduite de refroidissement pour moteur a combustion interne Download PDF

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Publication number
EP1546536B1
EP1546536B1 EP03769202A EP03769202A EP1546536B1 EP 1546536 B1 EP1546536 B1 EP 1546536B1 EP 03769202 A EP03769202 A EP 03769202A EP 03769202 A EP03769202 A EP 03769202A EP 1546536 B1 EP1546536 B1 EP 1546536B1
Authority
EP
European Patent Office
Prior art keywords
piston
cooling channel
bores
crown
combustion engine
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 - Lifetime
Application number
EP03769202A
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German (de)
English (en)
Other versions
EP1546536A1 (fr
Inventor
Hans-Jürgen Köhnert
Peter Kemnitz
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
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Filing date
Publication date
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Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1546536A1 publication Critical patent/EP1546536A1/fr
Application granted granted Critical
Publication of EP1546536B1 publication Critical patent/EP1546536B1/fr
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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
    • 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
    • F02F3/225—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid the liquid being directed into blind holes
    • 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
    • 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
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a one-piece cooling channel piston for an internal combustion engine, comprising a piston head forged from steel, comprising a combustion recess in the piston head, a ring wall with a ring section and a closed cooling channel circulating at the level of the ring section, wherein a piston shaft is connected to the hubs attached to the piston head.
  • Generic one-piece cooling channel piston are for example from the EP 0 799 373 B1 or DE 100 13 395 C1 known.
  • a piston blank is prepared by forging, an annular recess and the downwardly open cooling channel introduced by means of a machining and then finished the outer contour of the piston finished.
  • the axial height of the annular recess corresponds to the EP 0 799 373 B1 at least the axial height of the cooling channel. This is necessary because for the preparation of the downwardly open cooling channel a hook-shaped turning tool must be inserted into the recess and rotated by appropriate axial and radial delivery of the cooling channel in its desired shape.
  • the disadvantage of these pistons is that the height of the hook-shaped turning tool determines the cooling channel height to be achieved and thus the amount of heat to be dissipated from the piston crown due to high wall thicknesses.
  • the recess would have to be increased for the introduction of the turning tool, but would be accompanied by an undesirable increase in the height of the piston.
  • the invention is therefore based on the object of specifying an improved piston concept for a one-piece cooling channel piston, with which a cost-effective production of low piston height is guaranteed and can be counteracted with the effect of a piston deformation due to the effect of high gas pressures and temperatures.
  • the object is achieved in particular by the fact that a cooling channel formed in the piston head distributed on its circumference to the piston crown directed towards holes with such distances from each other, that the existing between the holes piston material forms support ribs for the piston crown.
  • the cooling channel can be formed closer to the piston head or combustion bowl and still has an excellent dimensional stability with a low piston height.
  • the arrangement of the support ribs a kind of chamber formation in the cooling channel, d. H. Generation of shaker chambers, whereby an extension of the residence time of the cooling oil and thus improved heat dissipation of the piston areas to be cooled is achieved.
  • the cooling effect can be further improved by an increased number of bores in the regions of the cooling channel in which the firing jets strike the piston crown.
  • the one-piece cooling channel piston consists of a forged piston head 1 made of steel or malleable Al alloy with a combustion bowl 3 in its piston crown 2, an annular wall 4 with ring portion 11, at the height of the ring section 11 encircling closed cooling channel 7, wherein a piston skirt 9 with the connected to the piston head 1 hubs 12 is connected.
  • the production of the piston takes place after EP 0 799 373 B1 , wherein before closing the cooling channel 7 by means of a cover 13 according to the invention in the cooling channel 7 holes 14 are provided, which are distributed symmetrically distributed on the circumference and in the direction of the piston head 2, that is parallel to the piston longitudinal axis K introduced.
  • the depth h B of the holes 14 is a maximum of a quarter of the total height H of the cooling channel 7, so that an unhindered cooling oil circuit is ensured.
  • the cooling oil inlet 5 and the cooling oil outlet 10 is arranged opposite in a cooling channel cover 13, which consists of a two-part spring element. Through the cooling channel cover 13, the closure of the cooling channel 7 takes place at its end open to the piston skirt 9.
  • FIGS. 3 and 4 show, designated between the holes 14 material areas supporting ribs 8, whose width is determined by the distance of the holes 14.
  • the holes 14 are in the cooling channel 7 circumferentially spaced such that it corresponds to at least half the diameter of the holes 14, wherein the bore diameter are all identical. It is, of course, at the discretion of the skilled person, even different bore diameter then the distance should be half of the largest bore diameter to counteract piston deformation during engine operation.
  • the holes 14 and thus the support ribs 8 are, as in Fig. 4 represented, distributed radially symmetrically over the circumference of the cooling channel 7 arranged.
  • the number of holes 14 and thus the distribution of the support ribs 8 may be designed so that a greater number of support ribs 8 is arranged in pressure-back pressure direction D or GD, as transverse to, ie, a unbalanced circumferential distribution in the cooling channel 7 takes place.
  • the distribution of the bores 14 and thus of the support ribs 8 in the cooling channel 7 when it is characterized according to the quadrant formed by the piston main axes K H I - IV be such that within a quadrant a symmetric ( Fig.
  • the cooling effect can be further improved by an increased number of bores in the regions of the cooling channel 7 in which the firing jets of the ignited fuel strike the piston crown 2. As a result, in the load case, the occurring stress loads of the piston can be better countered.
  • the holes 14 can be realized by round holes, as in the FIGS. 4 and 6 shown, or by elongated holes (not shown), which are aligned with its long side in the direction of the piston center radially outward to the piston wall. With these respective embodiments of the bore arrangements is achieved that they have different distances and thus the formed as a support ribs 8 material is increased. Decisive for the spacing of the bores is that this corresponds from the bore axis to the bore axis circumferentially at least half of the largest bore diameter used.
  • the tips of the holes 14 may be round or, as in Fig. 1 shown to be angled.
  • the axes of the holes 14 can, as Fig. 1 shows, parallel to the piston longitudinal axis K and / or, that is, in combination, to be arranged at an acute angle thereto, the bores preferably in the direction of the piston head 2 and the combustion bowl 3 show.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (6)

  1. Piston monobloc à conduite de refroidissement pour un moteur à combustion avec une tête de piston (1) en acier forgé comprenant une cavité de combustion (3) dans le fond (2), une paroi annulaire (4) avec une partie segments (11) et une conduite de refroidissement (7) fermée et continue à hauteur de la partie segments (11), sachant qu'une jupe de piston (9) est reliée aux moyeux (12) accrochés à la tête de piston (1), et présent, dans la conduite de refroidissement, des orifices (14) orientés vers le fond du piston, caractérisé en ce que, que les orifices (14) sont disposés sur la périphérie de la conduite de refroidissement (7) dans des zones où des jets de combustion affectent le fond de piston, que les orifices forment un angle aigu par rapport à l'axe du piston, et que les orifices sont disposés à une telle distance les uns des autres que le matériau du piston situé entre ces orifices (14) forme des nervures-supports (8) pour le fond de piston (2).
  2. Piston selon la revendication 1, caractérisé en ce que la distance entre les orifices (14) sur la périphérie de la conduite de refroidissement (7) s'élève à au moins la moitié du diamètre de l'orifice (14).
  3. Piston selon la revendication 2, caractérisé en ce que les orifices (14) présentent le même diamètre.
  4. Piston selon la revendication 1, caractérisé en ce que les orifices (14) présentent une profondeur (hB) qui s'élève au maximum à un quart de la hauteur totale (H) de la conduite de refroidissement (7).
  5. Piston selon la revendication 1 à 4, caractérisé en ce qu'au moins certains des axes des orifices (14) s'étendent parallèlement à l'axe longitudinal du piston (K).
  6. Piston selon la revendication 1, caractérisé en ce que les axes des orifices (14) s'étendent sous un angle aigu par rapport à l'axe longitudinal du piston (K).
EP03769202A 2002-09-25 2003-09-19 Piston monobloc a conduite de refroidissement pour moteur a combustion interne Expired - Lifetime EP1546536B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10244510A DE10244510A1 (de) 2002-09-25 2002-09-25 Einteiliger Kühlkanalkolben für einen Verbrennungsmotor
DE10244510 2002-09-25
PCT/DE2003/003116 WO2004029443A1 (fr) 2002-09-25 2003-09-19 Piston monobloc a conduite de refroidissement pour moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1546536A1 EP1546536A1 (fr) 2005-06-29
EP1546536B1 true EP1546536B1 (fr) 2009-06-03

Family

ID=31502553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03769202A Expired - Lifetime EP1546536B1 (fr) 2002-09-25 2003-09-19 Piston monobloc a conduite de refroidissement pour moteur a combustion interne

Country Status (9)

Country Link
US (1) US6698392B1 (fr)
EP (1) EP1546536B1 (fr)
JP (1) JP2006501392A (fr)
KR (1) KR20050057589A (fr)
CN (1) CN100368674C (fr)
BR (1) BR0314798B1 (fr)
DE (2) DE10244510A1 (fr)
HK (1) HK1078916A1 (fr)
WO (1) WO2004029443A1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10301367A1 (de) * 2003-01-16 2004-07-29 Mahle Gmbh Verfahren zum Einbringen von Shakerbohrungen in den Kühlkanal eines einteiligen Kolbens
FR2854089B1 (fr) * 2003-04-23 2006-05-19 Semt Pielstick Procede de fabrication d'un piston, outillage pour la mise en oeuvre de ce procede et piston ainsi obtenu
US7104183B2 (en) * 2004-07-07 2006-09-12 Karl Schmidt Unisia, Inc. One-piece steel piston
DE102004038946A1 (de) 2004-08-11 2006-02-23 Mahle International Gmbh Kühlkanalkolben für einen Verbrennungsmotor mit Wärmerohren
DE102004038945A1 (de) * 2004-08-11 2006-02-23 Mahle International Gmbh Leichtmetallkolben mit Wärmerohren
DE102006027810A1 (de) * 2006-06-16 2007-12-20 Mahle International Gmbh Verfahren zur Herstellung eines einteiligen Kolbens sowie damit hergestellter Kolben
JP5063634B2 (ja) * 2009-03-12 2012-10-31 日立オートモティブシステムズ株式会社 内燃機関のピストン
CN107842437B (zh) * 2011-06-29 2020-03-06 天纳克公司 具有位于冠部下方的支撑结构的活塞
PL2761210T3 (pl) * 2011-09-28 2017-07-31 Ks Kolbenschmidt Gmbh Dwuczęściowy tłok stalowy do silników spalinowych
WO2013179146A1 (fr) 2012-05-30 2013-12-05 Gesenkschmiede Schneider Gmbh Piston forgé en une seule pièce et procédé de fabrication correspondant
US10787991B2 (en) 2013-02-18 2020-09-29 Tenneco Inc. Complex-shaped forged piston oil galleries
EP2956653B1 (fr) 2013-02-18 2020-04-29 Tenneco Inc. Galeries d'huile de piston de forme complexe avec têtes de piston fabriquées par le biais de procédés utilisant du métal coulé ou de la poudre métallique
US9334958B2 (en) 2013-02-18 2016-05-10 Federal-Mogul Corporation Complex-shaped forged piston oil galleries
DE102013009155A1 (de) * 2013-05-31 2014-12-04 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE202013102921U1 (de) 2013-07-03 2014-10-06 Gesenkschmiede Schneider Gmbh Zweiteiliger Kühlkanalkolben
US10584659B2 (en) 2015-03-23 2020-03-10 Tenneco Inc Robust, lightweight, low compression height piston and method of construction thereof
US20170058824A1 (en) * 2015-08-28 2017-03-02 Ks Kolbenschmidt Gmbh Piston with low overall height
US10316790B2 (en) * 2016-09-27 2019-06-11 TennecoInc. Piston ring-belt structural reinforcement via additive machining
DE102016225637A1 (de) * 2016-12-20 2018-06-21 Mahle International Gmbh Verfahren zum Herstellen eines einteiligen Kolbens für einen Verbrennungsmotor durch Schmieden
CN109268495B (zh) * 2018-11-19 2020-07-10 滨州渤海活塞有限公司 一种钢活塞与活塞销的组合及其加工工艺
DE102021128792B3 (de) 2021-11-05 2022-07-07 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kolben für einen Hubkolbenmotor, entsprechender Motor und Kraftfahrzeug mit einem solchen

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FR954188A (fr) * 1947-10-02 1949-12-20 Oerlikon Buehrle Ag Piston en métal léger pour moteurs à combustion interne
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DE3708377A1 (de) * 1986-03-20 1987-10-01 Mahle Gmbh Oelgekuehlter kolben fuer verbrennungsmotoren
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US5144884A (en) * 1989-01-11 1992-09-08 Cummins Engine Company, Inc. Two-part piston assembly device
DE4010062A1 (de) * 1990-03-29 1991-10-02 Mahle Gmbh Gekuehlter tauchkolben fuer verbrennungsmotoren mit voneinander getrenntem kolbenoberteil und kolbenschaft
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Also Published As

Publication number Publication date
CN1685142A (zh) 2005-10-19
WO2004029443A1 (fr) 2004-04-08
JP2006501392A (ja) 2006-01-12
US6698392B1 (en) 2004-03-02
CN100368674C (zh) 2008-02-13
BR0314798B1 (pt) 2012-10-02
HK1078916A1 (en) 2006-03-24
KR20050057589A (ko) 2005-06-16
DE10244510A1 (de) 2004-04-08
DE50311581D1 (de) 2009-07-16
BR0314798A (pt) 2005-07-26
EP1546536A1 (fr) 2005-06-29

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