EP2900992A1 - Piston en deux parties pour moteur à combustion interne - Google Patents

Piston en deux parties pour moteur à combustion interne

Info

Publication number
EP2900992A1
EP2900992A1 EP13763077.8A EP13763077A EP2900992A1 EP 2900992 A1 EP2900992 A1 EP 2900992A1 EP 13763077 A EP13763077 A EP 13763077A EP 2900992 A1 EP2900992 A1 EP 2900992A1
Authority
EP
European Patent Office
Prior art keywords
piston
base body
ring element
ring
separation
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Withdrawn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
EP13763077.8A
Other languages
German (de)
English (en)
Inventor
Emmerich Ottliczky
Eberhard Weiss
Gerhard Luz
Willi Sikorsky
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 EP2900992A1 publication Critical patent/EP2900992A1/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Withdrawn legal-status Critical Current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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
    • 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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling 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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0053—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by soldering
    • 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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49252—Multi-element piston making

Definitions

  • the invention relates to a piston of an internal combustion engine, designed as a two-part cooling channel piston, which comprises a base body and a ring element, according to the features of the preamble of claim 1. Furthermore, the present invention relates to a method for producing such a piston according to claim 9.
  • the piston for internal combustion engines is exposed to high thermal and gas and mass forces caused by high mechanical cycling, which require an appropriate design and shape. Heavily loaded zones of the piston, such as the combustion bowl in the piston crown and the ring field, require effective cooling.
  • a cooling channel in the piston A coolant, preferably the lubricating oil of the internal combustion engine, circulates through the cooling channel designed as a hollow space. The effectiveness of the piston cooling is determined in particular by the exchanged volume of the coolant in the cooling channel.
  • a two-part cooling channel piston comprising a main body and a ring member.
  • the annular, the top land and the ring field of the piston enclosing, separate ring member which limits the outside of the cooling channel is fastened by means of a screw thread on the base body.
  • a position fixation of the ring element is carried out in the installed state by means of dowel pins or grub screws, which are inserted between the ring member and the main body.
  • the US 6,155,157 shows a cooling channel piston with two separately manufacturable components, which are then joined together by a friction welding material.
  • the present invention has for its object to provide a two-part cooling channel piston, which includes a permanent connection of the individual components.
  • the ring element and the base body together form two mutually offset circumferential separation planes, for which purpose two corresponding joining webs of the ring element and of the main body cooperate, which are materially connected to one another.
  • the ring element is supported by two height-offset, positioned in different positions joining webs of the associated joint webs of the body.
  • This design principle allows a piston assembly with which a permanent connection of the individual piston components can be realized.
  • the concept offers the advantage of optimizing the cooling channel by means of a corresponding design of the ring element so as to improve the piston cooling and to realize a piston which can be loaded to a higher thermal load.
  • the construction or the design of the separate ring element, in particular with respect to wall thicknesses of individual piston sections can be influenced, so as to reduce the piston weight, for example. Furthermore, it is possible to optimize the top land, the ring field or the ring carrier of the ring element. According to the invention, this structure offers the possibility of the separation planes between the base body and the ring element so to arrange, so that sets in terms of component strength and / or welding an optimal position.
  • the invention offers the possibility to specially form the thermally and mechanically highly stressed ring element.
  • the annular element enclosing the land and the ring field for the piston rings can thus be optimized in terms of fatigue strength and wear resistance.
  • no defined position of the separation planes is provided for the piston.
  • the cooperating, circumferential joining zones can advantageously be designed so that they are both offset from each other and also aligned differently.
  • a piston may include matching or differently configured separation planes. Thereafter, the invention provides the ability to provide between the ring member and the body two height-offset separation planes, one of which can extend vertically and the other horizontally.
  • the invention includes a piston in which at least one of the two separation planes is oriented obliquely or inclined.
  • these can be rectified or run in opposite directions. It is advantageous for the respective separation level no determination of the course direction.
  • a centering effect of these components can continue to be utilized when joining the ring element and the base body.
  • a vertically oriented separation plane is preferably provided in the piston crown between the ring element and the base body, and a horizontally aligned separation plane below the ring zone of the ring element. In this piston construction, a maximum height offset between the two separation levels sets.
  • the base body forms on the outside a circumferential step whose concentric to a longitudinal axis of the piston extending joint is enclosed by the joint of the ring member to form a vertical separation plane.
  • the length of the separation plane can be influenced by the axial length of the step or the paragraph, this concept also causes a centering of the components in a mating.
  • a preferred embodiment of the invention further provides that the corresponding, cooperating joining webs of the ring element and the base body have constant wall thicknesses. Bonding webs with at least approximately equal-sized wall thicknesses cause a desired optimal stress compensation or a stress distribution in the piston upper part.
  • the invention offers the possibility of producing the ring element and the base body from a matching material or from different materials. This advantage is offered by a multi-part piston, wherein the choice of material can be made with regard to the respective thermal and / or mechanical stress.
  • the ring element is preferably made of a wear-resistant, in particular heat-resistant material.
  • As a material for The base body can be selected to reduce weight, a less wear-resistant material, such as a light metal alloy.
  • a method for producing a piston includes the following method steps.
  • the manufacturing process of the main body and the ring element includes the design of the joints without reworking. In this case, the main body and the ring element can be made of a matching material or of different materials. With the subsequent pre-processing, the combustion bowl and a pin bore in the body and piston ring grooves can be introduced into the ring field of the ring member.
  • a friction welding or a multi-orbital or multilinear friction welding is used.
  • an electron beam welding, a resistance press welding method, a capacitor discharge welding or a laser welding is suitable.
  • Furthermore can be used for cohesive bonding of the corresponding joining webs a soldering. After the welding process has been completed, the welding beads emerging to the outside are removed. The last step is followed by a finishing and cleaning of the piston.
  • FIG. 1 shows a sectional view of a first embodiment of a piston (1) according to the invention
  • FIG. 2 shows a second embodiment of a piston according to the invention
  • FIG. 3 shows a third embodiment of a piston according to the invention
  • FIG. 4 shows a fourth embodiment of a piston (1) according to the invention -
  • FIG. 1 shows, in a sectional view, a piston 1 integral with its manufacture, comprising a base body 2 and a ring element 3, the joining webs 6a, 6b forming separation planes 4a, 5a; 7a, 7b are connected.
  • a Reibsch past a Reibsch
  • a multi-orbital friction welding method is used in which, due to the smallest circular orbital movements, no or only small welding beads 8, 9 form in the region of the separation planes 4a, 5a which require little or no reworking.
  • the wall thickness Si, S 2 of the joining webs 6a, 6b and the joining webs 7a, 7b is largely constant. Between the vertically oriented separation plane 5a and the horizontally extending separation plane 4a, a maximum height offset H is established.
  • the main body 2 of the piston 1 includes a combustion chamber trough 12 introduced eccentrically or rotationally symmetrically with respect to a longitudinal axis 1 1 in a piston head 10.
  • a piston skirt 13 of the base body 2 includes two diametrically opposed bolt holes 14 intended to receive a piston pin (not shown).
  • a combustion chamber trough 12 enclosing intermediate wall 16 defines on the inside a cooling channel 15, which is surrounded on the outside by the ring element 3.
  • the cooling channel 15 is closed circumferentially after the welding of the base body 2 with the ring member 3.
  • a cooling medium can act on the cooling channel 15 in a targeted manner via at least one inlet and one outlet (not shown).
  • the ring element 3 has piston crown side on a top land 17, to which a ring field 18 with annular grooves 19 connects, which are intended for receiving piston rings (not shown).
  • FIG. 2 to 4 show alternative embodiments of the piston 1 according to the invention, wherein for identical or equivalent components matching reference numerals are used. The following description of the figures is essentially limited to distinguishing features from FIG. 1.
  • the piston 1 comprises two vertically oriented separation planes 4b, 5a between the base body 2 and the Ring element 3.
  • the separation plane 4b is formed by a step 20 of the base body 2, which is surrounded on the outside by an end portion of the ring element 3.
  • An overlapping region of the joining webs 7a, 7b of the cooperating components, the base body 2 and the ring element 3 defines the separation plane 4b.
  • FIG. 3 the piston 1 is shown, the construction of which largely coincides with the representation in FIG.
  • the piston 1 in Figure 3 shows next to the separation plane 4b according to Figure 2, the horizontally extending, the intermediate wall 16 associated separation plane 5b, which are formed by the joining webs 21 a, 21 b.
  • the step 20 of the main body 2 can be used for centering the ring element 3.
  • the piston 1 in FIG. 4 comprises two inclined or oblique separation planes 4c, 5c between the base body 2 and the ring element 3.
  • the Separation levels 4c, 5c are opposite to each other.

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) destiné à un moteur à combustion interne, réalisé sous la forme d'un piston à conduit de refroidissement constitué de deux parties, comprenant un corps de base (2) et un élément annulaire (3). L'élément annulaire (2), qui comporte une zone annulaire (18) ainsi qu'une couronne de piston (17), entoure extérieurement un conduit de refroidissement (15) limité côté intérieur par une paroi intermédiaire (16) qui sépare le conduit de refroidissement (15) d'une cavité de chambre de combustion (12) ménagée dans un fond de piston (10) du corps de base (2). Le corps de base (2) et l'élément annulaire (3) forment ensemble deux niveaux de séparation (4a, 5a) périphériques décalés l'un par rapport à l'autre, auxquels sont reliées par liaison de matière respectivement deux brides de jonction (6a, 6b; 7a, 7b) de l'élément annulaire (3) et du corps de base (2) qui coopèrent.
EP13763077.8A 2012-09-27 2013-09-18 Piston en deux parties pour moteur à combustion interne Withdrawn EP2900992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012217599 2012-09-27
PCT/EP2013/069368 WO2014048810A1 (fr) 2012-09-27 2013-09-18 Piston en deux parties pour moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2900992A1 true EP2900992A1 (fr) 2015-08-05

Family

ID=49209376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13763077.8A Withdrawn EP2900992A1 (fr) 2012-09-27 2013-09-18 Piston en deux parties pour moteur à combustion interne

Country Status (7)

Country Link
US (2) US20150226151A1 (fr)
EP (1) EP2900992A1 (fr)
CN (1) CN104662277B (fr)
BR (1) BR112015005723A2 (fr)
DE (1) DE102013218709A1 (fr)
MX (1) MX2015003487A (fr)
WO (1) WO2014048810A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2686559C2 (ru) * 2015-01-29 2019-04-29 Кэнон Кабусики Кайся Инициализатор предсказателя палитры при кодировании или декодировании самостоятельных кодируемых структур
EP3452712A1 (fr) * 2016-05-04 2019-03-13 KS Kolbenschmidt GmbH Piston
DE102017202462A1 (de) 2017-02-15 2018-08-16 Mahle International Gmbh Verfahren zum Herstellen eines Kolbens
DE102017211480A1 (de) * 2017-07-05 2019-01-10 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens
US10865734B2 (en) 2017-12-06 2020-12-15 Ai Alpine Us Bidco Inc Piston assembly with offset tight land profile
DE102021203241A1 (de) 2021-03-30 2022-10-06 Mahle International Gmbh Kolben für eine Brennkraftmaschine und Verfahren zur Herstellung des Kolbens

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007270813A (ja) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd 内燃機関用ピストン
US20120037111A1 (en) * 2010-08-10 2012-02-16 Mahle International Gmbh Piston for an internal combustion engine and method for its production
US20120222632A1 (en) * 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine
WO2013083342A1 (fr) * 2011-12-09 2013-06-13 Ks Kolbenschmidt Gmbh Piston de moteur à combustion interne
WO2013167105A1 (fr) * 2012-05-05 2013-11-14 Mahle International Gmbh Procédé de fabrication d'un piston pour un moteur à combustion

Family Cites Families (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245640B (de) * 1964-11-25 1967-07-27 Mahle Kg Kolben fuer Brennkraftmaschinen
CH450062A (de) * 1964-11-26 1968-01-15 Mahle Kg Brennkraftmaschinenkolben
DE2307347A1 (de) * 1973-02-15 1974-08-22 Maschf Augsburg Nuernberg Ag Mehrteiliger tauchkolben fuer viertaktbrennkraftmaschinen, insbesondere grossdieselmotoren
FR2238372A5 (fr) * 1973-07-19 1975-02-14 Dampers
DD123962A1 (fr) 1975-12-24 1977-01-26
GB8413800D0 (en) * 1984-05-30 1984-07-04 Ae Plc Manufacture of pistons
GB8622538D0 (en) * 1986-09-18 1986-10-22 Ae Plc Pistons
US6003479A (en) * 1997-05-12 1999-12-21 Evans; Mark M. Piston construction
US6155157A (en) 1998-10-06 2000-12-05 Caterpillar Inc. Method and apparatus for making a two piece unitary piston
DE19846152A1 (de) * 1998-10-07 2000-04-13 Mahle Gmbh Kolben mit Kolbengrundkörper aus geschmiedetem Stahl und einem Kühlkanal
US6327962B1 (en) * 1999-08-16 2001-12-11 Caterpillar Inc. One piece piston with supporting piston skirt
DE10244512A1 (de) * 2002-09-25 2004-04-15 Mahle Gmbh Mehrteiliger gekühlter Kolben für einen Verbrennungsmotor
DE10325914B4 (de) * 2003-06-07 2012-08-02 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE10340291A1 (de) * 2003-09-02 2005-04-14 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE10340292A1 (de) * 2003-09-02 2005-04-14 Mahle Gmbh Kolben für einen Verbrennungsmotor
US7104183B2 (en) * 2004-07-07 2006-09-12 Karl Schmidt Unisia, Inc. One-piece steel piston
DE102005034306A1 (de) * 2004-10-30 2006-05-18 Ks Kolbenschmidt Gmbh Verfahren zur Herstellung eines Kolbens einer Brennkraftmaschine zur Bildung einer Bewehrung einer Brennraummulde des Kolbens
DE102006027355A1 (de) * 2006-06-13 2007-12-20 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu dessen Herstellung
DE102006055251A1 (de) * 2006-11-23 2008-05-29 Mahle International Gmbh Zweiteiliger Kolben für einen Verbrennungsmotor
CN101092914A (zh) * 2007-07-20 2007-12-26 山东滨州渤海活塞股份有限公司 带封闭内冷油腔的焊接式锻钢整体活塞及其制造方法
DE102007044106A1 (de) * 2007-09-15 2009-03-19 Mahle International Gmbh Zweiteiliger Kolben für einen Verbrennungsmotor
KR101554759B1 (ko) * 2007-12-20 2015-09-21 말레 인터내셔널 게엠베하 내연 기관용 피스톤에 링 부재를 고정하기 위한 방법
DE102007061601A1 (de) * 2007-12-20 2009-06-25 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
DE102008038325A1 (de) * 2007-12-20 2009-06-25 Mahle International Gmbh Verfahren zum Befestigen eines Ringelementes auf einem Kolben für einen Verbrennungsmotor
US20110197845A1 (en) * 2010-02-17 2011-08-18 William Flowers Piston assembly
DE102010033879A1 (de) * 2010-08-10 2012-02-16 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
US9856820B2 (en) * 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly
DE102010056220A1 (de) * 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102010056218A1 (de) * 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102011013143A1 (de) * 2011-03-04 2012-09-06 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
DE102011107656A1 (de) * 2011-07-12 2013-01-17 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
US9593641B2 (en) * 2011-09-21 2017-03-14 Mahle International Gmbh Laser welded piston assembly
US9404439B2 (en) * 2012-10-12 2016-08-02 Mahle International Gmbh Piston with cooling gallery and cooling gallery fins
US9291119B2 (en) * 2013-03-14 2016-03-22 Mahle International Gmbh Piston assembly with preloaded support surfaces

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007270813A (ja) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd 内燃機関用ピストン
US20120037111A1 (en) * 2010-08-10 2012-02-16 Mahle International Gmbh Piston for an internal combustion engine and method for its production
US20120222632A1 (en) * 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine
WO2013083342A1 (fr) * 2011-12-09 2013-06-13 Ks Kolbenschmidt Gmbh Piston de moteur à combustion interne
WO2013167105A1 (fr) * 2012-05-05 2013-11-14 Mahle International Gmbh Procédé de fabrication d'un piston pour un moteur à combustion

Also Published As

Publication number Publication date
US20170328302A1 (en) 2017-11-16
CN104662277A (zh) 2015-05-27
BR112015005723A2 (pt) 2017-07-04
DE102013218709A1 (de) 2014-03-27
CN104662277B (zh) 2019-06-18
WO2014048810A1 (fr) 2014-04-03
US20150226151A1 (en) 2015-08-13
MX2015003487A (es) 2015-09-25

Similar Documents

Publication Publication Date Title
EP2900992A1 (fr) Piston en deux parties pour moteur à combustion interne
EP1483493B1 (fr) Piston refroidi constitue de plusieurs pieces concu pour un moteur a combustion interne
EP2681437B1 (fr) Piston pour moteur à combustion interne et son procédé de production
DE60122533T2 (de) Kolben und verfahren zur herstellung
DE102010033881A1 (de) Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
WO2007082564A1 (fr) Piston a canaux de refroidissement pour moteur a combustion interne
WO2007031107A1 (fr) Piston, en particulier piston a canal de refroidissement, comportant au moins trois zones de soudure par friction
WO2004029442A1 (fr) Piston refroidi compose de plusieurs parties pour moteur a combustion interne
DE102008056203A1 (de) Mehrteiliger Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
WO2014012532A1 (fr) Piston pour un moteur à combustion interne
DE102009032916A1 (de) Mehrteiliger Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
EP2184478A1 (fr) Piston en plusieurs parties pour un moteur à combustion
EP2321513B2 (fr) Piston pour un moteur à combustion interne
DE4327772A1 (de) Leichtmetallkolben für hochbelastete Verbrennungsmotoren
WO2017133947A1 (fr) Piston d'un moteur à combustion interne
WO2013004218A1 (fr) Piston pour un moteur à combustion interne
WO2014012530A1 (fr) Piston pour un moteur à combustion interne
DE102009015820A1 (de) Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
EP3507479A1 (fr) Piston constitué d'une partie intérieure et d'une partie extérieure
DE102011088066A1 (de) Kolben für Brennkraftmaschinen
EP2893177B1 (fr) Piston pour moteur à combustion interne
DE3733910C2 (fr)
WO2018104399A1 (fr) Piston en acier à poids optimisé
EP2011986A2 (fr) Piston à canal de refroidissement en une pièce doté de deux éléments de piston vissés ensemble
WO2015104013A1 (fr) Piston pour moteur à combustion interne et son procédé de fabrication

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150217

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: KS KOLBENSCHMIDT GMBH

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20190408

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20191019