EP1483493B1 - Piston refroidi constitue de plusieurs pieces concu pour un moteur a combustion interne - Google Patents

Piston refroidi constitue de plusieurs pieces concu pour un moteur a combustion interne Download PDF

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Publication number
EP1483493B1
EP1483493B1 EP02772020A EP02772020A EP1483493B1 EP 1483493 B1 EP1483493 B1 EP 1483493B1 EP 02772020 A EP02772020 A EP 02772020A EP 02772020 A EP02772020 A EP 02772020A EP 1483493 B1 EP1483493 B1 EP 1483493B1
Authority
EP
European Patent Office
Prior art keywords
piston
annular
support
seat
cooled
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
EP02772020A
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German (de)
English (en)
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EP1483493A1 (fr
Inventor
Peter Kemnitz
Dieter Messmer
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
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1483493A1 publication Critical patent/EP1483493A1/fr
Application granted granted Critical
Publication of EP1483493B1 publication Critical patent/EP1483493B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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 multi-part cooled piston for a Internal combustion engine, consisting of an integrally formed piston upper part, comprising a combustion bowl and a ring wall with ring portion, and an integrally formed piston lower part, which is a box-shaped Piston shaft, hubs for receiving the piston connecting the piston with the connecting rod Piston pins and hub supports connected to the piston skirt, comprising, wherein a cooling channel through the piston upper part and piston lower part is formed and limited in its cross section by this.
  • Such generic pistons are for example from DE-PS 800 350, DE-OS 2 212 922, EP 0 604 223 A1, Jp 60-143148, Jp 60-178345 known.
  • These Pistons have essentially central screw connections and thus have the known disadvantages of so-called built piston, in which by punctiform connection of piston upper and lower part under the Combustion pressure a relative movement causing the wear between arises two piston components.
  • the connection wear-resistant piston upper parts made of light metal existing piston bottoms arises without the aforementioned disadvantage in purchase
  • the glands were in the outer Flange edge area laid, such as from FR 753,615 or US 2,159,989.
  • these are known from the 30's Constructions are not comparable with the concepts of modern pistons, as these are for significantly lower combustion chamber pressures were designed. In addition, you can Combustion wells are not possible in such constructions.
  • a piston is further known in which a wear-resistant Piston ring field is generated by a piston body with a Flank and the ring field or part of the ring field forming Annular ring element made of any suitable material mechanically connected - screwed here - and secured against loosening.
  • the disadvantage is that only the ring field consists of seal-proof material and high Compression pressures are not feasible with low piston height.
  • the invention therefore deals with the problem of a piston concept for a multi-piece cooled piston for an internal combustion engine to be found at increasing engine power a reduction in compression height and a Increasing the heat load allowed and that one assembly of the piston without structural change allows.
  • a part of the support means as ring and annular Support rib are formed, a thread for screwing the piston parts, wherein the annular rib is designed in its wall construction such that this elastic deformation due to the force exerted on the piston crown Combustion chamber pressure is possible without the stability of the screw connection too Reduce.
  • the support means it is advantageous by the positional arrangement of the support means, the over the piston longitudinal axis in the radial direction to the piston skirt surface Outgoing radii are defined, the power flow from the piston crown over the Support means on the hub supports or piston pin effectively without Overload of the piston material derived. Damage due to mechanical Stress, such as stress cracks, are thus effectively avoidable.
  • the inventive construction has the advantage that the centering the upper piston part to the lower piston part is not performed by the screw, but by wall portions of a stepped formation of the support means, which forms the second, ie outer, support.
  • the solution according to the invention are piston tops made of heat-resistant steel and piston bases, consisting of Forged AFP steel, particularly easy and inexpensive connectable.
  • the multi-part cooled piston 20, as shown in FIG. 1, consists of a Piston upper part 1, which has a combustion bowl 3 and an annular wall 4 with Ring part 11 comprises, and a piston lower part 2, comprising a box-shaped piston shaft 9, hubs for receiving the piston with the Connecting rod connecting piston pin (not shown) and hub supports 6, the are connected to the piston shaft 9.
  • a cooling channel 7 is through the Upper piston part 1 and piston lower part 2 formed and in its cross section through these are limited.
  • the piston upper part 1 has support means, which consists of one of the combustion bowl. 3 facing away from the bottom side annular bearing surface 10a, a part the horizontal cross-sectional area 12a of the annular wall 4 and of an annular rib fifth consists.
  • support means are also provided which consist of a annular support rib 13, the cross-sectional area 10b of the support rib 13 and a annular support web 14 consist.
  • To form a first level and horizontal support 10 for both piston parts 1, 2 serve the annular Support surface 10 a and the cross-sectional area 10 b of the annular support rib 13, wherein the Auflage10 relative to the piston diameter D radially inward is arranged and forms an inner support.
  • a second, level and horizontal arranged support 12 for both piston parts consists of the horizontal part of the Cross-sectional area 12a of the annular wall 4 and the cross-sectional area 12b of the annular support web 14, so that a step-shaped design of the support web 14th arises, through which the piston upper part is centered.
  • Essentially serves for Centering of the wall portion 4a ( Figure 2) of the annular wall 4, with its Cross-sectional area in the axial direction to the piston shaft 9 forms an air gap, such as from Fig. 1 and Fig. 2 can be seen.
  • the first and second edition is related to Piston height in each case different horizontal planes E1 and E2 arranged, which are characterized by the height H.
  • a thread 8 for screwing piston upper part 1 and lower piston part 2 is on the radially outward circumferential side relative to the piston diameter the annular rib 5 as an external thread and at the radially inward Peripheral side of the annular support rib 13 designed as an internal thread.
  • the pin boss facing annular rib 5 in axial Piston direction an at least partially cylindrical or conical shaped Section 13a, which carries the thread and runs parallel to the piston axis (K), wherein the cylindrical or conical shaped portion 13a of the annular rib a Section 13b in the direction of combustion chamber 3 with reduced wall thickness follows.
  • an elastic region is generated, which by the combustion chamber pressure absorb generated mechanical stresses and on the piston pin can derive.
  • the thread-bearing peripheral side of the annular rib 5 has a radius R sheath (R M ), which is in a range R coat ⁇ R Center of the hub support (R MN ) and R coat > R Inner end of the hub support (R IEM ) is arranged, wherein all radii are defined from the piston longitudinal axis (K) in the radial direction to the piston skirt surface and the radii "center of the hub support” and “inner end of the hub support” to the zenith of the hub bore (N Z ) are related, as shown in FIG 1 and 2 are shown.
  • the assembly of both piston parts is carried out in the means of relating to Supporting rib 13 projecting wall portion 4a, the piston upper part 1 to Centered piston lower part 2 and then screwed onto the piston lower part becomes.
  • the height H (distance of the planes E1, E2) of the first to the second edition 10, 12th is designed so that by a height difference of about 50 microns first the outer bearing surfaces 12a, 12b touch and after another rotational movement to overcome the height difference, the inner bearing surfaces 10a, 10b, so in the fully bolted state of the piston upper part 1 with the Piston lower part 2 resulting cooling channel 7 only by the support surfaces 10a, 10b, 12a, 12b is sealed. Due to the large diameter is the thread self-locking. In addition, however, a clamping sleeve below the 3rd groove, the radial is attached, be provided.
  • the piston upper part 1 may be made of an oxidation-resistant and / or heat-resistant Material exist. Typically, steels with chromium contents are used ⁇ 4% from the material groups of chemically resistant steels acc. din EN 10027-2 (steel group numbers 1.4x xx) such as stainless, heat resistant or heat-resistant steels, as well as from the material group of alloyed Tool steels, such as alloyed hot-work tool steels.
  • the piston lower part consists of a precipitation-hardening ferritic-pearlitic Steel or tempered steel, typically steel grades 38MnVS6 or 42CrMo4 be used (according to German steel-iron material sheet 101).

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

Claims (11)

  1. Piston refroidi constitué de plusieurs parties, pour un moteur à combustion interne, composé d'une partie de piston supérieure, qui comprend une cavité de combustion et une paroi annulaire avec partie annulaire, et d'une partie de piston inférieure qui comprend une jupe de piston en forme de caisson, des bossages pour recevoir les axes de piston reliant le piston à la bielle et des supports de bossages qui sont reliés à la jupe de piston, un canal de refroidissement étant réalisé à travers aussi bien la partie de piston supérieure que la partie de piston inférieure de piston et étant limité par celles-ci dans sa section transversale,
    la partie de piston supérieure (1) et la partie de piston inférieure (2) comprenant des moyens de support (4, 5, 8, 13, 14) avec des surfaces d'appui (10a, 10b, 12a, 12b), qui forment un premier et un second appuis (10, 12),
    caractérisé en ce
    que les moyens de support (5, 8, 13) de la partie de piston supérieure et inférieure, comprenant le premier appui (10), comportent des pas de vis (8) pour visser les deux parties de piston, de sorte que lorsque la partie de piston supérieure est vissée à la partie de piston inférieure, les deux parties de piston sont exclusivement supportées par le premier et le second appui (10, 12),
    que le premier appui (10) est disposé de manière approximativement centrée par rapport à la partie annulaire (11) et le second appui (12) est disposé en-dessous de la partie annulaire (11) et
    que le vissage est disposé de manière approximativement centrée à l'intérieur d'une zone définie par REnveloppe < RCentre du support de bossage (RMN) et REnveloppe > RExtrémité intérieure du support de bossage (RIEM), tous les rayons étant définis à partir de l'axe de piston (K) dans la direction radiale par rapport à la surface enveloppante du piston et les rayons « Centre du support de bossage » et « Extrémité intérieure du support de bossage » se rapportant au zénith du perçage de bossage (Nz).
  2. Piston refroidi constitué de plusieurs parties selon la revendication 1, caractérisé en ce que le premier et le second appuis (10, 12) sont disposés respectivement dans des plans horizontaux (E1, E2) différents par rapport à la hauteur du piston.
  3. Piston refroidi constitué de plusieurs parties selon la revendication 1 ou 2, caractérisé en ce que le premier appui (10) est disposé radialement à l'intérieur par rapport au diamètre du piston et forme un support intérieur pour la partie de piston supérieure et le second appui (12) est disposé radialement à l'extérieur par rapport au diamètre du piston et forme un support extérieur pour la partie de piston supérieure.
  4. Piston refroidi constitué de plusieurs parties selon la revendication 1, caractérisé en ce que les moyens de support de la partie de piston supérieure (1) comprennent la surface d'appui (10a) du côté de fond détourné de la cavité de combustion, une partie de la surface de section transversale horizontale (12a) de la paroi annulaire (4) et une nervure annulaire (5), et que les moyens de support de la partie de piston inférieure (2) comprennent une nervure porteuse (13) de forme annulaire, de la surface de section transversale (10b) de la nervure porteuse (13), ainsi qu'une aile porteuse (14) de forme annulaire avec sa surface de section transversale (12b).
  5. Piston refroidi constitué de plusieurs parties selon la revendication 1 ou 4, caractérisé en ce que le pas de vis (8) destiné au vissage des parties de piston supérieure et inférieure est réalisé en filetage sur le côté périphérique de la nervure annulaire (5) situé radialement vers l'extérieur par rapport au diamètre du piston et est réalisé en taraudage sur le côté périphérique de la nervure porteuse (13) situé radialement vers l'intérieur par rapport au diamètre du piston.
  6. Piston refroidi constitué de plusieurs parties selon la revendication 4, caractérisé en ce que la nervure annulaire (5) orientée vers le bossage d'axe présente, dans la direction du piston, une section (13a) formée au moins partiellement de manière cylindrique ou conique, qui porte le pas de vis et s'étend parallèlement à l'axe du piston.
  7. Piston refroidi constitué de plusieurs parties selon la revendication 6, caractérisé en ce que la section (13a), formée de manière cylindrique ou conique, de la nervure annulaire (5) est suivie, dans la direction de la cavité de combustion (3), par une section (13b) avec une épaisseur de paroi réduite.
  8. Piston refroidi constitué de plusieurs parties selon la revendication 4, caractérisé en ce que les surfaces d'appui du premier appui (10) sont constituées de la surface d'appui (10a) disposée sur le côté de fond détourné de la cavité de combustion (3) et de la surface de section transversale (10b) de la nervure portante de forme annulaire.
  9. Piston refroidi constitué de plusieurs parties selon la revendication 1, caractérisé en ce que le second appui (12) est constitué d'une partie de la surface de section transversale totale de la paroi annulaire (4) et de la surface de section transversale (12b) de l'aile porteuse (14), de sorte qu'il se crée une configuration étagée de l'aile porteuse (14), par l'intermédiaire de laquelle la partie de piston supérieure (1) est centrée.
  10. Piston refroidi constitué de plusieurs parties selon la revendication 1, caractérisé en ce que le canal de refroidissement créé lorsque la partie de piston supérieure (1) est vissée à la partie de piston inférieure (2), n'est rendu étanche que par les surfaces d'appui (10a, 10b, 12a, 12b).
  11. Piston refroidi constitué de plusieurs parties selon la revendication 1, caractérisé en ce que la partie de piston supérieure (1) est constituée d'un matériau inoxydable et/ou d'un matériau thermorésistant et la partie de piston inférieure (2) d'un acier ferritique-perlitique durcissant par précipitation ou un acier trempé et revenu.
EP02772020A 2002-03-09 2002-08-13 Piston refroidi constitue de plusieurs pieces concu pour un moteur a combustion interne Expired - Lifetime EP1483493B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210570A DE10210570A1 (de) 2002-03-09 2002-03-09 Mehrteiliger gekühlter Kolben für einen Verbrennungsmotor
DE10210570 2002-03-09
PCT/DE2002/002960 WO2003076786A1 (fr) 2002-03-09 2002-08-13 Piston refroidi constitue de plusieurs pieces conçu pour un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1483493A1 EP1483493A1 (fr) 2004-12-08
EP1483493B1 true EP1483493B1 (fr) 2005-06-15

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EP02772020A Expired - Lifetime EP1483493B1 (fr) 2002-03-09 2002-08-13 Piston refroidi constitue de plusieurs pieces concu pour un moteur a combustion interne

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US (1) US6763758B2 (fr)
EP (1) EP1483493B1 (fr)
JP (1) JP2005527725A (fr)
KR (1) KR100893015B1 (fr)
BR (1) BR0215633B1 (fr)
DE (2) DE10210570A1 (fr)
WO (1) WO2003076786A1 (fr)

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US7533601B2 (en) 2006-12-12 2009-05-19 Mahle Technology, Inc. Multi-part piston for a combustion engine
DE102008056203A1 (de) 2008-11-06 2010-05-12 Mahle International Gmbh Mehrteiliger Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102009015820A1 (de) 2009-04-01 2010-10-07 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102009032912A1 (de) 2009-07-14 2011-01-20 Mahle International Gmbh Mehrteiliger Kolben für einen Verbrennungsmotor
WO2011006469A1 (fr) 2009-07-14 2011-01-20 Mahle International Gmbh Piston en plusieurs parties pour un moteur à combustion interne et procédé de fabrication

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EP3452712A1 (fr) 2016-05-04 2019-03-13 KS Kolbenschmidt GmbH Piston
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CN113187618B (zh) * 2021-05-08 2022-09-20 滨州学院 一种轻量化内冷一体铝活塞

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US7533601B2 (en) 2006-12-12 2009-05-19 Mahle Technology, Inc. Multi-part piston for a combustion engine
DE102008056203A1 (de) 2008-11-06 2010-05-12 Mahle International Gmbh Mehrteiliger Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102009015820A1 (de) 2009-04-01 2010-10-07 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102009032912A1 (de) 2009-07-14 2011-01-20 Mahle International Gmbh Mehrteiliger Kolben für einen Verbrennungsmotor
WO2011006469A1 (fr) 2009-07-14 2011-01-20 Mahle International Gmbh Piston en plusieurs parties pour un moteur à combustion interne et procédé de fabrication

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DE50203435D1 (de) 2005-07-21
KR100893015B1 (ko) 2009-04-15
BR0215633B1 (pt) 2011-02-22
JP2005527725A (ja) 2005-09-15
EP1483493A1 (fr) 2004-12-08
DE10210570A1 (de) 2003-09-18
BR0215633A (pt) 2004-12-21
US20030167918A1 (en) 2003-09-11
WO2003076786A1 (fr) 2003-09-18
KR20040088582A (ko) 2004-10-16
US6763758B2 (en) 2004-07-20

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