EP2094961A2 - Piston en deux parties pour un moteur à combustion interne - Google Patents

Piston en deux parties pour un moteur à combustion interne

Info

Publication number
EP2094961A2
EP2094961A2 EP07817720A EP07817720A EP2094961A2 EP 2094961 A2 EP2094961 A2 EP 2094961A2 EP 07817720 A EP07817720 A EP 07817720A EP 07817720 A EP07817720 A EP 07817720A EP 2094961 A2 EP2094961 A2 EP 2094961A2
Authority
EP
European Patent Office
Prior art keywords
piston
bearing surfaces
chromium layer
partly
microns
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Withdrawn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
EP07817720A
Other languages
German (de)
English (en)
Inventor
Jochen Kortas
Christof Geissler
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 EP2094961A2 publication Critical patent/EP2094961A2/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Withdrawn legal-status Critical Current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
    • F02F3/20—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
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • 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
    • F05C2201/0403—Refractory metals, e.g. V, W
    • F05C2201/0406—Chromium
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a two-part piston for an internal combustion engine according to the preamble of claim 1.
  • German Patent Application No. 10 2006 015 587.4 discloses an upper part of a built-up piston which, on its lower side facing away from the piston crown, has an annular rib with an inner contact surface and an annular wall with an outer contact surface.
  • Schwingungsreibverschl In order to avoid assembly of the piston upper part with a piston lower part in engine operation, resulting in relative movements of the piston upper part and the piston, Schwingungsreibverschl excreibverschl excreibverschl generate and welds the contact surfaces of the two piston parts and thus wear of the contact surfaces to be incorporated into the contact surfaces of the upper groove-shaped recesses.
  • the recesses are made by turning or by means of a laser, which has the disadvantage that the production of the recesses is relatively complicated and expensive.
  • FIG. 1 is a sectional view of an existing of an upper part and a lower part of the piston, which are bolted together by means of expansion bolts,
  • FIG. 2 is a perspective view of the lower part of the piston and the bearing surfaces over which the upper part of the piston rests on the lower part
  • Fig. 3 is a perspective view of the upper part of the piston and the bearing surfaces
  • Fig. 4 shows a cross section of the support surface with a chromium layer.
  • Fig. 1 shows a piston 1 for an internal combustion engine, which consists of an upper part 2 and a lower part 3.
  • the upper part 2 made of steel and the lower part 3 made of nodular cast iron or aluminum, or the upper part 2 and the lower part 3 of the piston 1 made of steel.
  • the upper part 2 and the lower part 3 are screwed together by means of two expansion screws 4 and 5.
  • the upper part 2 forms the piston head 6, in which a combustion bowl 7 is arranged.
  • the piston 1 radially outwardly a circumferential cooling channel 8, which is partly formed in the upper part 2 and partly in the lower part 3 of the piston 1.
  • the cooling channel 8 is bounded radially on the outside by a ring wall 9 connected to the piston head 6 and radially inwardly by the piston head 6, partly by a circumferential upper annular rib 10 formed on the underside of the upper part 2 facing away from the piston crown and partly by a side of the lower part facing the piston head 3 attached lower annular rib 11.
  • two holes 12 and 13 and in the upper ring flu 10 two blind holes 14 and 15 are introduced with internal thread in the lower annular rib.
  • an inner cooling space 17 is limited, which has a lower opening 18 through which cooling oil is injected into the inner cooling space 17. 2, the cooling oil passes from the cooling space 17 into the cooling channel 8, which has an oil drain opening 20 shown in FIG. 2, via which the cooling oil is conducted into the piston interior 21.
  • the lower part 3 of the piston 1 furthermore has a piston shaft 22 and two pin bores 23 and 24, which are shown in FIGS. 1 and 2.
  • the upper annular rib 10 has on its underside and the lower annular rib 11 on its upper side in each case an inner, ring-shaped Positioning surface 25, 26, over which the radially inner portions of the upper part 2 and the lower part 3 of the piston 1 lie on one another.
  • the end face of the annular wall 9 facing away from the piston crown and a collar 27 mounted on the upper side of the lower part 3 each have an outer, annular bearing surface 28 and 29, over which the radially outer regions of the upper part 2 and of the lower part 3 rest on one another.
  • the distance of the inner bearing surfaces 25, 26 from the piston head 6 is less than the distance between the outer bearing surfaces 28, 29 from the piston head. 6
  • the surface of the chromium layer 30 in this case has the form of buds or nubs.
  • the roughness Rz of the chromium layer 30 is between 10 ⁇ m and 25 ⁇ m.
  • the surface-structured chromium layer 30 can be applied by an electrochemical (galvanic) path, wherein nucleation processes of the chromium are triggered by means of electrical voltage pulses on the bearing surfaces and subsequently the growth of the chromium nuclei is effected by further chromium addition by means of further sequence pulses.
  • the bearing surfaces 25, 26, 28, 29 of the upper part 2 and the lower part 3 existing, screwed piston 1 move in engine operation relative to each other, so that this results in a Schwingungsreibverschl founded on the bearing surfaces and a friction welding of the bearing surfaces.
  • material welds of parts of the bearing surfaces result with attributable to it, partial material triggering.
  • the surface The patterned chromium layer 30 according to the invention has the advantage that the oil retention volume of the structured surface of the chromium layer 30 is improved, thereby avoiding the vibration-wear and the friction welding of the relatively moving bearing surfaces.
  • the structuring of the surface of the chromium layer 30 reduces the pressure-related, partial material welding and damage to the bearing surfaces.
  • the chromium layer 30 is harder and thus more resistant to wear than the piston base material, so that the chromium layer has a lower frictional wear during engine operation than the prior art chromium-plated piston base material.

Landscapes

  • 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)

Abstract

L'invention concerne un piston (1) en deux parties pour un moteur à combustion interne, composé d'une partie supérieure (2) et d'une partie inférieure (3) vissée à la partie supérieure. La partie supérieure (2) et la partie inférieure (3) se trouvent en contact l'une avec l'autre, partiellement au moyen de surfaces d'appui intérieures (25, 26) délimitant le côté inférieur d'une nervure annulaire supérieure (10) et le côté supérieur d'une nervure annulaire inférieure (11), et partiellement au moyen de surfaces d'appui extérieures (28, 29) délimitant le côté inférieur de la paroi annulaire (9) et le côté supérieur d'un collet (27) disposé sur la partie inférieure (3). Pour éviter une corrosion due au frottement, un soudage par friction et un soudage de matériaux dû à la pression, au moins une surface d'appui (25, 26, 28, 29) est revêtue, de façon simple et économique, d'une couche de chrome (30) présentant une surface structurée présentant une pluralité de saillies et d'évidements.
EP07817720A 2006-11-23 2007-10-23 Piston en deux parties pour un moteur à combustion interne Withdrawn EP2094961A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006055251A DE102006055251A1 (de) 2006-11-23 2006-11-23 Zweiteiliger Kolben für einen Verbrennungsmotor
PCT/DE2007/001886 WO2008061486A2 (fr) 2006-11-23 2007-10-23 Piston en deux parties pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2094961A2 true EP2094961A2 (fr) 2009-09-02

Family

ID=39204929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07817720A Withdrawn EP2094961A2 (fr) 2006-11-23 2007-10-23 Piston en deux parties pour un moteur à combustion interne

Country Status (6)

Country Link
US (1) US8631736B2 (fr)
EP (1) EP2094961A2 (fr)
KR (1) KR101394777B1 (fr)
CN (1) CN202039963U (fr)
DE (1) DE102006055251A1 (fr)
WO (1) WO2008061486A2 (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009015820A1 (de) * 2009-04-01 2010-10-07 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
US8065985B2 (en) * 2009-05-04 2011-11-29 Federal-Mogul Corporation Piston having a central cooling gallery with a contoured flange
US10180115B2 (en) 2010-04-27 2019-01-15 Achates Power, Inc. Piston crown bowls defining combustion chamber constructions in opposed-piston engines
JP5782109B2 (ja) 2010-04-27 2015-09-24 アカーテース パワー，インク． 対向ピストン式エンジン用の燃焼室構造
US9512779B2 (en) 2010-04-27 2016-12-06 Achates Power, Inc. Swirl-conserving combustion chamber construction for opposed-piston engines
US8820294B2 (en) 2010-08-16 2014-09-02 Achates Power, Inc. Fuel injection spray patterns for opposed-piston engines
US9163505B2 (en) 2010-08-16 2015-10-20 Achates Power, Inc. Piston constructions for opposed-piston engines
US9309807B2 (en) 2011-05-18 2016-04-12 Achates Power, Inc. Combustion chamber constructions for opposed-piston engines
US20130104848A1 (en) 2011-10-27 2013-05-02 Achates Power, Inc. Fuel Injection Strategies in Opposed-Piston Engines with Multiple Fuel Injectors
KR101892618B1 (ko) * 2011-12-30 2018-10-04 콤포넨타 핀란드 오와이 대형 내연기관을 위한 피스톤
DE102013218709A1 (de) * 2012-09-27 2014-03-27 Ks Kolbenschmidt Gmbh Zweiteilig aufgebauter Kolben einer Brennkraftmaschine
CN103016191A (zh) * 2012-11-23 2013-04-03 大连滨城活塞制造有限公司 活塞裙部形线结构
KR101383121B1 (ko) * 2013-07-01 2014-04-09 삼영기계주식회사 피스톤 조립체
US9211797B2 (en) 2013-11-07 2015-12-15 Achates Power, Inc. Combustion chamber construction with dual mixing regions for opposed-piston engines
US9470136B2 (en) 2014-03-06 2016-10-18 Achates Power, Inc. Piston cooling configurations utilizing lubricating oil from a bearing reservoir in an opposed-piston engine
US20160053712A1 (en) * 2014-08-19 2016-02-25 Deere & Company Piston for Use in an Engine
US9759119B2 (en) 2015-01-14 2017-09-12 Achates Power, Inc. Piston cooling for opposed-piston engines
US12510015B2 (en) 2015-01-14 2025-12-30 General Atomics Aeronautical Systems, Inc. Piston bearing assembly for an opposed-piston engine
US9995213B2 (en) 2015-03-31 2018-06-12 Achates Power, Inc. Asymmetrically-shaped combustion chamber for opposed-piston engines
US9840965B2 (en) 2015-07-31 2017-12-12 Achates Power, Inc. Skewed combustion chamber for opposed-piston engines
EP3356666A1 (fr) * 2015-10-01 2018-08-08 KS Kolbenschmidt GmbH Piston en deux parties à canal de refroidissement ouvert
EP3371443B1 (fr) 2015-11-02 2024-04-10 KS Kolbenschmidt GmbH Soutien de moyeu optimisé
US10294887B2 (en) 2015-11-18 2019-05-21 Tenneco Inc. Piston providing for reduced heat loss using cooling media
US10119493B2 (en) 2016-02-29 2018-11-06 Achates Power, Inc. Multi-layered piston crown for opposed-piston engines
EP3452712B1 (fr) 2016-05-04 2024-11-20 KS Kolbenschmidt GmbH Piston
DE102016209816A1 (de) 2016-06-03 2017-12-07 Mahle International Gmbh Zweiteiliger Kolben für eine Brennkraftmaschine
CN113431698B (zh) * 2020-03-23 2023-04-11 强莉莉 一种分体复合式隔热活塞
JP2023034872A (ja) * 2021-08-31 2023-03-13 マツダ株式会社 エンジンのピストン構造及びエンジンシステム
JP2023034846A (ja) * 2021-08-31 2023-03-13 マツダ株式会社 エンジンのピストン構造
CN116412038B (zh) * 2022-10-19 2026-04-07 中国船舶集团有限公司第七一一研究所 一种活塞顶、活塞裙部及组合活塞

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Publication number Priority date Publication date Assignee Title
EP0697513A1 (fr) * 1994-08-19 1996-02-21 Mahle Gmbh Piston composite pour moteur à combustion interne
DE19828545C1 (de) * 1998-06-26 1999-08-12 Cromotec Oberflaechentechnik G Galvanisches Bad, Verfahren zur Erzeugung strukturierter Hartchromschichten und Verwendung

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DE4029315A1 (de) * 1990-09-15 1992-03-19 Mahle Gmbh Tauchkolben fuer verbrennungsmotoren
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Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0697513A1 (fr) * 1994-08-19 1996-02-21 Mahle Gmbh Piston composite pour moteur à combustion interne
DE19828545C1 (de) * 1998-06-26 1999-08-12 Cromotec Oberflaechentechnik G Galvanisches Bad, Verfahren zur Erzeugung strukturierter Hartchromschichten und Verwendung

Also Published As

Publication number Publication date
KR101394777B1 (ko) 2014-05-15
WO2008061486A2 (fr) 2008-05-29
WO2008061486A3 (fr) 2011-03-03
US20110041684A1 (en) 2011-02-24
DE102006055251A1 (de) 2008-05-29
US8631736B2 (en) 2014-01-21
CN202039963U (zh) 2011-11-16
KR20090089331A (ko) 2009-08-21

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