EP2440760A1 - Piston en métal léger à bol de combustion multi-cavité - Google Patents

Piston en métal léger à bol de combustion multi-cavité

Info

Publication number
EP2440760A1
EP2440760A1 EP10744671A EP10744671A EP2440760A1 EP 2440760 A1 EP2440760 A1 EP 2440760A1 EP 10744671 A EP10744671 A EP 10744671A EP 10744671 A EP10744671 A EP 10744671A EP 2440760 A1 EP2440760 A1 EP 2440760A1
Authority
EP
European Patent Office
Prior art keywords
piston
combustion bowl
omega
undercut
bowl
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.)
Withdrawn
Application number
EP10744671A
Other languages
German (de)
English (en)
Inventor
Volker Gniesmer
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP2440760A1 publication Critical patent/EP2440760A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a cast iron piston produced from a light-weight metal material, in particular aluminum or an aluminum alloy, of a diesel internal combustion engine.
  • the piston comprises a piston upper part, which has an omega-shaped combustion bowl in the region of a piston crown, and a ring field on the outside for receiving piston rings.
  • the piston upper part is adjoined by a piston shaft in which diametrically opposite hub bores are introduced.
  • the design of the piston recess significantly influences the operating and exhaust behavior of a diesel internal combustion engine.
  • the different requirements between the part-load and the full-load operation of an internal combustion engine require a compromise in the design of the piston recess.
  • the so-called omega-trough shape has been found to be particularly suitable, which forms a symmetrically curved piston recess in the piston crown.
  • DE 196 21 635 A1 discloses a piston for a diesel internal combustion engine with such a combustion bowl.
  • the piston crown Due to the increase in performance of diesel internal combustion engines, the piston crown, in particular the combustion bowl of light metal pistons, is exposed to increased stress due to the mechanical stress of the gas pressure and the elevated temperature level as well as the stresses from the temperature gradients.
  • the reliability and To increase the service life of the pistons In particular, the trough edge of the combustion chamber trough is subject to a critical state of stress, since the accelerated gas flow enhances the heat transfer in this zone. As a result, the temperature of the trough edge rises and, together with the large tangential stress from the temperature distribution, leads to overelastic stress.
  • the invention has for its object to realize a piston with an improved thermal fatigue strength in the edge region of the combustion bowl.
  • the embodiment according to the invention comprises a piston crown with a multiple omega combustion bowl.
  • the trough edge of the preferably centrally positioned combustion bowl is enclosed by at least one recess which is radially spaced apart from the edge region of the combustion bowl and is rotationally symmetrical in the piston head.
  • the constructive concept according to the invention improves the elastic deformation of the bowl rim area under thermal stress, whereby both The LCF load, the thermal fatigue strength, as well as the thermal shock-dependent component life and thus the entire service life of the piston are significantly increased.
  • This measure which positively influences the fatigue strength of the piston, can be increased cost-effectively and, in addition to the service life, also increases the economy of the piston.
  • the proposed cost-implementable measures according to the invention contribute significantly to counteract crack formation or plasticization of the basic structure in the edge region of the combustion chamber trough.
  • the supplemental recess in conjunction with the central combustion bowl to form a multi-omega combustion bowl, provides improved elasticity, allowing the edge region to thermally expand without the risk of plastic deformation.
  • the invention causes a thermo-mechanical relief of Muldenrand Schemeen, since the critical, thermally highly loaded edge zone of the combustion chamber can deform significantly more elastic during heating. The emergence of plastic deformation in the thermal expansion as the source of thermal shock cracks is thus largely prevented. Consequently, the invention advantageously provides for a higher LCF load for the trough edges or edge zones or peripheral regions of the combustion chamber trough or combustion bowl troughs, as well as improved resistance to extreme temperature changes. Within these relationships of constructive omega-wells according to the invention, an optimal protection of the trough edges is guaranteed against thermal shock cracks.
  • the invention provides that the one cylindrical to a longitudinal axis of the combustion bowl extending trough edge having particular centrally positioned combustion bowl from a introduced in the piston head recess in the form of an undercut or a groove-shaped, designed as a circumferential groove, rounded depression is enclosed.
  • Another embodiment of the invention includes the design of a triple omega combustion bowl.
  • the trough edge of this combustion bowl has on the piston bottom side a retracted, radially inwardly aligned, a balcony comparable contour, which forms an undercut.
  • This trough edge is enclosed by two mutually spaced recesses in the piston head.
  • the invention includes recirculating grooves or undercuts, which are both recirculating closed as well as alternately recessed partially recessed introduced in the piston crown. This creates the opportunity to adapt the triple-omega combustion bowl, for example, to the circumferentially different thermal piston loads in the operating state.
  • a preferred embodiment of the invention provides that the invention additionally introduced Umlaufnut or groove-shaped depression is introduced into the piston head so that adjusts a stepped portion.
  • the two circulating grooves or groove-shaped depressions can be stepped and / or arranged at different or different distances from one another as required.
  • it makes sense to fill the Umlaufnut, groove-shaped depression or the undercut to create a multi-stage Omega-piston recess with a highly elastic material. This measure has the advantage that the additionally introduced groove-shaped depressions do not have a negative influence on the combustion process and influence, for example, the gas flow.
  • the ratio of the diameters between the central combustion bowl and the first circumferential groove or the first groove-shaped recess is preferably 0.55 to 1.1. Furthermore, according to the invention, a ratio of the diameters of the first circumferential groove or the first undercut and the second circumferential groove or the second undercut of 0.3 to 1.0 is provided for a triple omega combustion bowl.
  • a further design criterion according to the invention provides that the circumferential grooves, the groove-shaped depressions or the undercuts have a depth "yi, y 2 " of preferably 0.5 to 3% of the piston diameter. For the radii "r1" and “r2" in the vertexes between the individual combustion bowls, a preferred dimension between 0.5 to 5 mm is provided.
  • FIG. 1 shows, in half section, a piston designed according to the invention with a double-omega combustion bowl;
  • FIG. 2 shows a detail of the piston according to FIG. 1, showing a double omega combustion bowl as a detail
  • FIG. 4 is a view similar to FIG. 2 of a double omega combustion bowl with a circumferential groove
  • FIG. 5 shows a triple omega combustion bowl as a detail, wherein the outer combustion bowls are designed as recirculating grooves,
  • Figure 6 a triple-omega combustion bowl according to Figure 5, the outer combustion bowls are filled by an elastic material.
  • a piston 1 made of aluminum or an aluminum alloy, which comprises a piston upper part 2, which includes a central combustion bowl 4 a in the region of a piston crown 3, and a ring field 5 on the outside for receiving piston rings, not shown in FIGS. 1 and 2.
  • the piston upper part 2 is adjoined by a piston shaft 6, in which two diametrically opposite hub bores 7 are introduced.
  • To form a double Omega combustion bowl 8 is a cylindrically extending, to a longitudinal axis 13 rotationally symmetrical trough edge 10 a of the combustion bowl 4 a of a circumferentially formed as a rounded, groove-shaped groove 9 radially spaced enclosed.
  • the one aligned in the direction of the piston crown 3, curved and rounded trained compression projection 14 having combustion chamber 4 a is separated by a narrow-dimensioned, a vertex 11 a forming projection of the circumferential groove 9.
  • FIGS 2 to 6 show further embodiments of inventively designed multiple omega combustion bowls, wherein matching components are provided with the same reference numerals. The following description is limited to different details of the multiple combustion bowls according to the invention.
  • the double omega combustion bowl 8 includes the combustion bowl 4b, with a bowl edge 10b designed as an undercut on the piston crown side and forming a balcony 15.
  • a circumferential groove 9 is provided in the piston head 3 as a groove-shaped depression, which is separated by the axially projecting balcony 15 and the adjoining vertex 11b of the combustion bowl 4b.
  • FIG. 3 shows a triple-omega combustion bowl 12.
  • the central combustion chamber 4b arranged around the longitudinal axis 13 is enclosed by two further combustion bowls.
  • At the vertex 11 b are followed to form a second and third combustion bowl each radially spaced and mutually offset in height arranged undercuts 16, 17, which are separated by the vertex 18.
  • undercuts 16, 17, for example, rounded recesses are suitable.
  • the triple omega combustion bowl 12 can be structurally adapted to different requirements.
  • Both the individual diameters "DB" for the combustion bowl 4a and the diameter “Di, D2" for the additional combustion bowls designed as undercuts 16, 17 can be adapted to the respective requirements, in particular the thermal loads and / or the material quality
  • the dimension “ST” determines the distance between the combustion bowl 4a and the vertex 11b and thus the position of the undercut 16.
  • the dimension “S 2 " defines a distance between the piston head 3 and the vertex 18.
  • Die geometric design also refers to a variable design of the depths for the undercuts 16, 17, characterized by "yi; V 2 ".
  • the vertices 11b, 18 are in the formation of rounded transitions than radius R t, R 2 designed which are adapted to one another the same or different.
  • the double-omega combustion bowl 8 and the triple-omega combustion bowl 12, as an alternative to FIGS. 1 to 3, are associated with rotationally symmetrical circulating grooves 19, 20.
  • the circulating grooves 19, 20 of the triple-omega combustion bowl 12 according to FIG. 6 are filled with a highly elastic material, whereby a stepped, but otherwise non-interrupting, contour is established outside the central combustion bowl 4b. This avoids influencing the gas flow during the combustion process.
  • the highly elastic Material an elastic strain at temperature changes.

Landscapes

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

Abstract

L'invention concerne un piston (1) en matériau métallique léger, en particulier en aluminium ou en alliage d'aluminium, destiné à un moteur diesel et comprenant une partie supérieure (2) qui présente un bol de combustion (4a) dans la zone d'une tête de piston (3). Du côté extérieur, la partie supérieure de piston (2) comprend une zone de segmentation (5) destinée à la réception de segments de piston et se prolongeant par un corps de piston (6) dans lequel sont réalisés des alésages de moyeu (7) diamétralement opposés. Pour réaliser un bol de combustion multi-cavité (8), le bord (10a) du bol est entouré d'un évidement arrondi ménagé dans la tête de piston (3) à une certaine distance radiale du bord.
EP10744671A 2009-06-10 2010-05-28 Piston en métal léger à bol de combustion multi-cavité Withdrawn EP2440760A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009025063A DE102009025063A1 (de) 2009-06-10 2009-06-10 Leichtmetallkolben mit Mehrfach-Omega-Brennraummulde
PCT/EP2010/003271 WO2010142389A1 (fr) 2009-06-10 2010-05-28 Piston en métal léger à bol de combustion multi-cavité

Publications (1)

Publication Number Publication Date
EP2440760A1 true EP2440760A1 (fr) 2012-04-18

Family

ID=42937228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10744671A Withdrawn EP2440760A1 (fr) 2009-06-10 2010-05-28 Piston en métal léger à bol de combustion multi-cavité

Country Status (3)

Country Link
EP (1) EP2440760A1 (fr)
DE (1) DE102009025063A1 (fr)
WO (1) WO2010142389A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011081639B4 (de) 2011-08-26 2016-04-21 Federal-Mogul Nürnberg GmbH Gestaltoptimierte Brennraummulde eines Kolbens
DE102012103195A1 (de) * 2012-04-13 2013-10-17 Mwm Gmbh Kolben einer Brennkraftmaschine
DE102012103212A1 (de) 2012-04-13 2013-10-17 Mwm Gmbh Kolben einer Brennkraftmaschine
DE102012103206B4 (de) 2012-04-13 2017-08-03 Caterpillar Energy Solutions Gmbh Kolben einer Brennkraftmaschine
US20160138518A1 (en) * 2014-11-18 2016-05-19 Caterpillar Inc. Engine Piston
DE102015205349A1 (de) * 2015-03-24 2016-09-29 Mtu Friedrichshafen Gmbh Brennkraftmaschine und Kolben für eine Brennkraftmaschine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770557A (en) 1970-10-23 1973-11-06 Ford Motor Co High temperature insulation
DE2639294C2 (de) 1976-09-01 1982-05-13 Mahle Gmbh, 7000 Stuttgart Gepreßter Aluminiumkolben für Verbrennungsmotoren mit Einlagen aus einem anderen Werkstoff
DE3430056C1 (de) 1984-08-16 1986-01-16 Mahle Gmbh, 7000 Stuttgart Tauchkolben mit faserverstaerkter Brennraummulde fuer Verbrennungsmotoren
JPH0692772B2 (ja) * 1985-07-08 1994-11-16 マツダ株式会社 直噴式エンジンのピストン構造
DE19621635B4 (de) 1996-05-30 2004-02-05 Audi Ag Diesel-Brennkraftmaschine
DE19829384A1 (de) * 1998-07-01 2000-01-05 Man Nutzfahrzeuge Ag Kolben für eine Diesel-Brennkraftmaschine
DE19902864A1 (de) * 1999-01-25 2000-06-29 Daimler Chrysler Ag Kolben für Brennkraftmaschinen mit Direkteinspritzung und Verfahren zu dessen Herstellung
EP1386687B2 (fr) * 2002-07-30 2015-02-25 Federal-Mogul Nürnberg GmbH Piston et sa méthode de fabrication
US7185614B2 (en) * 2004-10-28 2007-03-06 Caterpillar Inc Double bowl piston
FR2884284A1 (fr) * 2005-04-12 2006-10-13 Renault Sas Piston a reserve d'air
FR2885958A1 (fr) * 2005-05-20 2006-11-24 Renault Sas Piston pour moteur a combustion interne et moteur a combustion interne comportant au moins un tel piston

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010142389A1 *

Also Published As

Publication number Publication date
WO2010142389A1 (fr) 2010-12-16
DE102009025063A1 (de) 2010-12-30

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