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EP1913250A1 - Piston pour un moteur a combustion interne et bague de fermeture pour le canal de refroidissement dudit piston - Google Patents

Piston pour un moteur a combustion interne et bague de fermeture pour le canal de refroidissement dudit piston

Info

Publication number
EP1913250A1
EP1913250A1 EP06761813A EP06761813A EP1913250A1 EP 1913250 A1 EP1913250 A1 EP 1913250A1 EP 06761813 A EP06761813 A EP 06761813A EP 06761813 A EP06761813 A EP 06761813A EP 1913250 A1 EP1913250 A1 EP 1913250A1
Authority
EP
European Patent Office
Prior art keywords
piston
cover ring
ring
cover
inner leg
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.)
Granted
Application number
EP06761813A
Other languages
German (de)
English (en)
Other versions
EP1913250B1 (fr
Inventor
Rolf-Gerhard Fiedler
Rainer Scharp
Hans-Peter Wieland
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 EP1913250A1 publication Critical patent/EP1913250A1/fr
Application granted granted Critical
Publication of EP1913250B1 publication Critical patent/EP1913250B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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 
    • F02F3/16—Pistons  having cooling means
    • 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
    • F02F5/00—Piston rings, e.g. associated with piston crown

Definitions

  • the present invention relates to a one-piece piston for an internal combustion engine, comprising a piston head and a piston recess spaced therefrom by an annular recess which has at least one hub bore for receiving a piston pin, wherein in the piston head, an annular circumferential cooling channel is provided for a coolant, with a made of at least two segments covering ring is closed.
  • the present invention further relates to a cover ring of two or more segments for the annular peripheral cooling passage of a one-piece piston for an internal combustion engine.
  • a generic piston and a generic cover ring are known from DE 103 46 822 A1.
  • This piston has an annular cooling channel which is closed on the shank side by a cover ring consisting of two semicircular half shells.
  • the cover ring is provided with an inwardly directed groove over which the half-shells can be slid on the outside of the piston for the purpose of mounting on a groove-shaped complementarily shaped projection.
  • the half-shells in the region of their abutting surfaces latching connections, by means of which the half-shells are quickly connected to each other.
  • the design of the cover with an additional groove or the piston with an additional projection but is expensive and therefore not desirable.
  • EP 0 561 817 B1 and EP 0 799 373 B1 disclose one-piece pistons with a cooling channel arranged in the edge region of the piston crown, which piston is likewise closed by cover rings which are in the form of a plate spring and possibly provided with a collar.
  • each segment of the plate spring-like cover ring must be individually introduced in the biased state in corresponding supports on the piston head.
  • the present invention is therefore based on the object to provide a generic piston or a generic cover ring, which contributes to a simplified piston construction and a reduced piston weight.
  • the solution consists in a piston having the features of claim 1 or in a cover ring with the features of claim 11. According to the invention, at least a portion of the cover at least partially protrudes into the clear opening of the at least one hub bore, such that the Cover ring or at least a portion of the cover at the same time forms the securing element for the piston pin.
  • the principle of the invention thus consists in that the cover acts as a securing element which limits the axial movement of the piston pin in the hub bore.
  • this task is taken over by snap rings or Seeger rings. These rings are used in Bolzenêtsnuten in the bolt hub.
  • the inventive design of the piston or the Cover ring now allows to dispense with these snap rings or Seeger rings.
  • the present invention contributes to the reduction of the weight of the piston.
  • the present invention also makes it possible to dispense with the introduction of the bolt securing grooves, whereby the piston construction is simplified.
  • the cover ring has an inner leg and an outer leg, which are interconnected by a bottom web.
  • This embodiment of the cover opens up a variety of ways to cover the cooling channel and / or the annular recess.
  • the inner leg can protrude into the clear opening of the at least one hub bore and in this way form the securing element for the piston pin provided according to the invention on the cover ring.
  • the outer leg may form the piston stem side boundary of the annular recess.
  • the cover ring is preferably formed in cross-section approximately U-shaped or approximately V-shaped. The design of the two legs and the bottom web connecting them can also be made in any other way (trapezoidal, semi-circular, etc.).
  • a further particularly preferred development consists in that the annular recess is arranged between an end face formed on the annular wall of the piston and at least one shoulder formed on the piston shaft and that the cover ring with its outer leg on the end face and with its bottom web on the at least one Shoulder supported.
  • the cover now encloses both the previous cooling channel and the annular recess, with the result that the previous cooling channel and the annular recess now form a new, enlarged cooling channel.
  • the cooling of the piston according to the invention is easier and safer.
  • the outer leg of the cover ring together with the annular wall and the piston skirt forms a nearly continuous, smooth surface, which improves the running properties of the piston according to the invention.
  • the configuration of the inner leg of the cover ring may also vary.
  • the height of the inner leg or the angular position of the inner leg relative to the center axis of the cover ring may vary over the circumference of the cover ring.
  • the flow channel for the coolant formed by the cover ring can be inclined from the inlet opening to the outlet opening.
  • Fig. 1 is a sectional view of an embodiment of the piston according to the invention.
  • FIG. 3 shows a perspective top view of an embodiment of a cover ring according to the invention
  • FIG. 4 is a perspective view of the piston of Figure 1.
  • FIGS 1, 2 and 4 show a one-piece piston 10 for an internal combustion engine.
  • the piston 10 is made of steel and has a piston head 11 and a piston shaft 12, which are integrally connected to one another via a shaft connection 13.
  • the piston head 11 and has a piston head 14 and a combustion bowl 15.
  • an annular circumferential cooling channel 16 is arranged, whose radially outer boundary is formed by an integrally formed on the piston head 14 ring wall 17 and its radially inner boundary of an annular rib 18.
  • the annular wall 17 serves as a piston ring carrier and closes off with a horizontal, the piston shaft 12 facing end surface 19th
  • pin bosses 20, 20 ' To the piston head 11 are two pin bosses 20, 20 'with two aligned hub bores 21, 21' integrally formed.
  • the pin bosses 20, 20 ' are connected to each other via shaft elements 22, 22'.
  • the shank elements 22, 22 ' are integrally formed on the Koibenkopf 11 via the shank connection 13.
  • the shaft connection 13 is set back in the direction of the piston longitudinal axis and merges into the annular rib 18.
  • an annular recess 25 is formed which is bounded on one side by the shaft connection 13 and on the other hand by the piston head 11 facing horizontal shoulders 24, 24 ', the shoulders 24, 24' forming the upper boundary of the shaft elements 22, 22 '.
  • a cover ring 30 with an outer leg 31, an inner leg 32 and a two leg connecting bottom web 33 is between the annular wall 17th and the shaft members 22, 22 'fitted.
  • the upper edge of the outer leg 31 is supported on the end face 19 of the annular wall 17, and the bottom web 33 is supported on the shoulders 24, 24 'of the shaft elements 22, 22' from.
  • the inner leg 32 is supported on the shaft connection 13.
  • the annular recess 25 is closed and sealed to the outside.
  • the annular circumferential cooling channel 16 and the annular recess 25 now form a new, substantially enlarged cooling channel.
  • the inner leg 32 of the cover 30 protrudes into the clear opening of the hub holes 21, 21 'in (see Figure 4).
  • the inner leg 32 of the cover ring 30 forms a securing element in these areas against the axial movement of the received in the hub bores 21, 21 'piston pin 23, which is indicated by dash-dotted lines in Figure 2.
  • the hitherto necessary security elements in the form of snap rings or Seeger rings are therefore unnecessary. For this reason, the pin bosses 20, 20 'no longer have any pin securing grooves, as can also be clearly seen in FIGS. 1 and 2.
  • the cover ring 30 can be made of a metallic material such as. Steel or aluminum or a suitable alloy, for example, cast or forged.
  • the cover ring 30 may also be made of a heat-resistant plastic, for example. In injection molding.
  • the cover ring 30 has an outer leg 31, an inner leg 32 and a bottom web 33 connecting both legs.
  • the cover ring 30 is approximately U-shaped in cross section; but it can also have other suitable cross-sections.
  • the cover ring 30 is formed in two parts in the embodiment.
  • the two ring segments 30a and 30b are riveted in the embodiment by means of tabs 34.
  • the cover ring 30 further comprises an inlet opening 35 and a discharge opening 36 diametrically opposite outlet opening 36 for a coolant.
  • the inlet opening 35 and the outlet opening 36 are formed in the joint regions of the ring segments 30a and 30b. Accordingly, the lying outside the joint areas 32a and 32b of the inner leg 32, the securing elements for the piston pin 23.
  • the inner leg 32 in the embodiment expediently has a varying in its annular profile height, serving as securing elements areas 32a, 32b highest are formed.
  • the height of the outer leg 31 is constant, because it is supported in the installed state of the cover 30 on the end face 19 of the annular wall 17.
  • the bottom web 33 of the cover ring 30 is formed in the exemplary embodiment so that it has an inclination starting from the inlet opening 35 to the outlet opening 36.
  • the flow speed of the coolant to the outlet opening 35 is increased, so that a harmful coolant accumulation is avoided.
  • the varying height of the inner leg 32 affects the flow characteristics of the coolant, so that they can be adjusted specifically.

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

Piston (10) en une seule pièce pour un moteur à combustion interne, qui comporte une tête de piston (11) et une jupe de piston (12) située à un certain écart de la tête par un évidement annulaire (25) et pourvue d'au moins alésage de moyeu (21, 21') destiné à recevoir un axe de piston (23). La tête de piston (11) comporte un canal de refroidissement (16) à extension annulaire pour un fluide de refroidissement, fermé par une bague de fermeture constituée d'au moins deux parties (30a, 30b). Selon la présente invention, au moins une zone de la bague de fermeture (30) recouvre au moins en partie l'ouverture libre de l'alésage de moyeu (21, 21'), de manière telle que la bague de fermeture (30) forme également l'élément de fixation pour l'axe de piston (23). La présente invention concerne en outre une bague de fermeture (30) de ce type.
EP06761813A 2005-08-06 2006-07-18 Piston pour un moteur a combustion interne et bague de fermeture pour le canal de refroidissement dudit piston Not-in-force EP1913250B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037175A DE102005037175A1 (de) 2005-08-06 2005-08-06 Kolben für einen Verbrennungsmotor sowie Abdeckring für den Kühlkanal eines solchen Kolbens
PCT/DE2006/001236 WO2007016891A1 (fr) 2005-08-06 2006-07-18 Piston pour un moteur a combustion interne et bague de fermeture pour le canal de refroidissement dudit piston

Publications (2)

Publication Number Publication Date
EP1913250A1 true EP1913250A1 (fr) 2008-04-23
EP1913250B1 EP1913250B1 (fr) 2009-04-01

Family

ID=37246589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06761813A Not-in-force EP1913250B1 (fr) 2005-08-06 2006-07-18 Piston pour un moteur a combustion interne et bague de fermeture pour le canal de refroidissement dudit piston

Country Status (7)

Country Link
US (1) US7387100B2 (fr)
EP (1) EP1913250B1 (fr)
KR (1) KR101279845B1 (fr)
CN (1) CN101238283B (fr)
BR (1) BRPI0614303A2 (fr)
DE (2) DE102005037175A1 (fr)
WO (1) WO2007016891A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030699B4 (de) * 2006-06-30 2014-10-02 Daimler Ag Gegossener Stahlkolben für Verbrennungsmotoren
DE102008055848A1 (de) 2008-11-04 2010-05-06 Ks Kolbenschmidt Gmbh Kühlkanalkolben einer Brennkraftmaschine mit einem Verschlusselement, das den Kühlkanal verschließt
GB2487686B (en) * 2009-10-30 2016-02-24 Caterpillar Inc Weight balanced internal combustion engine piston
USD737861S1 (en) 2009-10-30 2015-09-01 Caterpillar Inc. Engine piston
US8776670B2 (en) * 2010-02-17 2014-07-15 Mahle International Gmbh Piston assembly
DE102011116332A1 (de) * 2011-07-05 2013-01-10 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102012014195A1 (de) * 2012-07-18 2014-01-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
KR102161869B1 (ko) * 2013-03-13 2020-10-05 테네코 인코퍼레이티드 피스톤 및 그 제작의 방법
CN104500224B (zh) * 2014-12-12 2017-04-12 张家港市三林法兰锻造有限公司 精密型内燃机护罩环
US9759119B2 (en) 2015-01-14 2017-09-12 Achates Power, Inc. Piston cooling for opposed-piston engines
CN105221290B (zh) * 2015-10-27 2018-06-12 武汉理工大学 双层环形冷却油道活塞结构
DE102020210907A1 (de) 2020-08-28 2022-03-03 Mahle International Gmbh Kolben für eine Brennkraftmaschine

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DE252638C (fr)
US1426766A (en) * 1921-09-28 1922-08-22 James R Petrie Two-part piston ring
CH136457A (de) * 1928-09-26 1929-11-15 Franz Brozincevic & Co Arretiereinrichtung an Kolben mit einem Kolbenbolzen.
GB366332A (en) * 1931-03-23 1932-02-04 Elektronmetall Ges Mit Beschra Improvements in or relating to pistons for internal combustion engines
US1939959A (en) * 1932-09-06 1933-12-19 Wagner Electric Corp Piston wrist pin retainer
AU7781075A (en) * 1974-08-19 1976-08-05 Copeland Corp Piston rings
US4508019A (en) * 1982-03-29 1985-04-02 Deere & Company Reduced impact piston assembly
BR9005376A (pt) 1990-10-18 1992-06-16 Metal Leve Sa Embolo bipartido com fechamento postico de galeria e processo para sua obtencao
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DE4208037C2 (de) * 1992-03-13 1998-03-26 Mahle Gmbh Mehrteiliger, gekühlter Kolben für Verbrennungsmotoren
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JPH10196785A (ja) * 1997-01-10 1998-07-31 Isuzu Motors Ltd ピストン
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Also Published As

Publication number Publication date
CN101238283B (zh) 2010-04-21
WO2007016891A1 (fr) 2007-02-15
EP1913250B1 (fr) 2009-04-01
DE102005037175A1 (de) 2007-02-08
DE502006003339D1 (de) 2009-05-14
US20070028863A1 (en) 2007-02-08
US7387100B2 (en) 2008-06-17
KR101279845B1 (ko) 2013-06-28
BRPI0614303A2 (pt) 2011-03-22
KR20080034161A (ko) 2008-04-18
CN101238283A (zh) 2008-08-06

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