EP3063400A1 - Piston destiné à un moteur à combustion interne et procédé de fabrication dudit piston - Google Patents

Piston destiné à un moteur à combustion interne et procédé de fabrication dudit piston

Info

Publication number
EP3063400A1
EP3063400A1 EP14799668.0A EP14799668A EP3063400A1 EP 3063400 A1 EP3063400 A1 EP 3063400A1 EP 14799668 A EP14799668 A EP 14799668A EP 3063400 A1 EP3063400 A1 EP 3063400A1
Authority
EP
European Patent Office
Prior art keywords
piston
skirt
shaft walls
opposing
cover
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Withdrawn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
EP14799668.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Issler
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 EP3063400A1 publication Critical patent/EP3063400A1/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Withdrawn legal-status Critical Current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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along 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
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts

Definitions

  • the present invention relates to a piston for an internal combustion engine, comprising a piston head and a piston skirt, wherein the piston skirt having mutually opposite pin bosses with hub bores and opposing shaft walls with running surfaces, wherein at the lower end of the piston, a cover is provided.
  • a generic piston is known from German Patent Application DT 25 39 470 A1.
  • the known piston has a collecting trough for cooling oil arranged at its lower end.
  • the cooling oil is moved by the so-called "shaker effect", resulting in an improved cooling effect, but the collecting trough must be securely and reliably attached to the piston since it must not become loose during engine operation.
  • the object of the present invention is to develop a generic piston such that a provided at the lower end of the piston cover is securely and reliably and yet fixed in a technically simple manner to this.
  • the object of the present invention is further to provide a method for producing such a piston.
  • the solution is that the cover at the free ends of the opposite shaft walls in the form of radially inwardly extending and integrally forged with the shaft walls floor parts is formed.
  • the method according to the invention provides that at least the piston skirt of the piston is produced by means of a forging method, that skirt wall extensions are integrally formed by forging on the mutually opposite skirt walls and that the skirt wall extensions are bent radially inward so that bottom parts extending radially inwardly result.
  • the floor parts provided according to the invention are integral, ie non-detachable, connected to the piston, preferably by means of a forging process. This represents a technically simple method for producing the piston according to the invention.
  • the inventively provided floor parts catch back flowing cooling oil and delay its outflow in the direction of the crankshaft.
  • the cooling oil can be introduced by means of a ⁇ lanspritzdüse directly into the interior of the piston above the bottom parts or flow from a cooling passage, if present, in the interior of the piston. Due to the shaker effect occurring during engine operation, the cooling oil collected by the bottom parts is moved in high frequency in the direction of the hub bores and the piston head. This results in an improved cooling effect.
  • the floor parts provided according to the invention furthermore permit improved cooling of the shaft walls, since the captured cooling oil is accumulated in the region of the shaft walls and the improved cooling effect produced by the shaker effect occurs more intensely in the region of the shaft walls.
  • the contour of the bottom parts is in principle arbitrary and can be adapted to the inner shape of the piston.
  • the bottom parts should cover the largest possible area of the underside of the piston. It is only necessary to make sure that there is enough room for the connecting rod movement during engine operation.
  • the inventive method allows a technically particularly simple production of the inventive 'KISSING piston.
  • Using a simple forging process blanks manufactured with extended shank walls in a working process.
  • the projecting region of the shaft walls is bent radially inwardly as a skirt wall extension by means of a simple bending process, so that the base parts provided according to the invention result.
  • the floor parts provided according to the invention may include a right angle or an acute angle with the shank walls. In the latter case, a larger amount of cooling oil is collected, so that the cooling effect is further improved.
  • At least one bottom part expediently has a recess.
  • the piston according to the invention is additionally provided with a circumferential cooling channel with at least one feed opening for cooling oil, it is advantageous for the recess to be aligned with the at least one feed opening.
  • the cooling channel can be supplied with cooling oil with the ⁇ lanspritzdüse.
  • At least one bottom part has on its surface facing the piston interior at least one depression, which acts as an oil collection container, so that the cooling effect is enhanced.
  • At least one bore or at least one radially extending slot is introduced between at least one skirt wall and its associated bottom part.
  • an increased rigidity of the piston skirt can be prevented, so that a hard carrying or seizing the piston skirt is avoided during engine operation.
  • a preferred embodiment of the method according to the invention is that the bottom parts on their lower surface facing away from the piston with at least one bearing surface be provided for centering and fixing the piston in a clamping tool. This simplifies any necessary finishing, in particular machining finishing, of the piston according to the invention.
  • the present invention is particularly suitable for low compression height pistons. These may be steel or light metal pistons with or without a cooling channel.
  • pistons made of an aluminum-based material without a cooling channel as described, for example, in German Offenlegungsschrift DE 41 10 306 A1.
  • Figure 1 shows an embodiment of a piston according to the invention with radially inwardly bent leg wall extensions
  • FIG. 2 shows the piston according to FIG. 1 in a view in the direction of the arrow A in FIG. 1;
  • FIG 3 shows a blank for the piston according to Figure 1 with axial shaft wall extensions.
  • Figures 1 and 2 show an embodiment of a piston 10 according to the invention.
  • the piston 10 may be made of a steel material or a light metal material, in particular an aluminum-based alloy.
  • the piston 10 is a monobloc box piston of a piston head element 1 1 and a piston body 21, which are non-detachably, for example. By means of a welding process, connected to each other.
  • the piston head element 1 1 has a piston crown 12, a wall region 14 of a combustion bowl 13, a circumferential one Fire bar 15 and a top annular groove 17 a circumferential ring portion 16.
  • the piston main body 21 has a Bodenbereieh 22 of the combustion bowl 13, the two lower annular grooves 23 of the annular portion 16 and opposing piston bosses 24 with hub bores 25 for receiving a piston pin (not shown).
  • the piston hubs 24 are connected in a conventional manner via running surfaces 27 having opposing shaft walls 26 with each other.
  • the piston head element 1 1 and the piston body 21 together form a height of the ring portion 16 arranged outer circumferential cooling channel 18, which has at least one feed opening 19 for cooling oil.
  • the piston head element 1 1 and the piston main body 21 together form the piston head 10 a of the piston 10, while the piston shaft 10 b of the piston 10 is formed solely by the piston main body 21.
  • the piston 10 is provided in its lower region, that is approximately at the level of the lower edges 28 of its running surfaces 27 with two bottom parts 31, 32, which form a cover of the piston interior 10 '.
  • the bottom parts 31, 32 are integrally formed on the free ends of the shaft walls 26, in the exemplary embodiment by means of a forging or bending process.
  • the bottom parts 31, 32 extend radially inwardly in the direction of a piston center axis M and form a right angle with the shaft walls 26.
  • the bottom parts 31, 32 can also be bent in the direction of the piston interior 10 'so that they form an acute angle with the shaft walls 26, as indicated by dash-dotted lines in FIG.
  • the contour of the bottom parts 31, 32 can be chosen arbitrarily. In order to achieve an optimally improved cooling effect, however, the bottom parts 31, 32 should cover the largest possible area of the underside of the piston 10, wherein a sufficiently dimensioned passage opening 33 for a connecting rod must be maintained.
  • a recess 34 is provided which serves as a passage for a leaking from a ⁇ lanspritzdüse cooling oil jet.
  • the recess 34 is arranged substantially in alignment with the feed opening 19 in the cooling channel 18, so that it can be supplied with cooling oil.
  • the inventively provided bottom parts 31, 32 are one piece, ie undetachable, connected to the piston and catch back flowing cooling oil and delay its outflow in the direction of the crankshaft.
  • the cooling oil collected by the base parts 31, 32 is moved in high frequency in the direction of the hub bores 25 and the piston head 10a. This results in an improved cooling effect, in particular in the area of the shaft walls 26, since the captured cooling oil is accumulated in this area.
  • the inventive method provides that at least the piston skirt 10b of the piston 10 is produced by means of a forging process.
  • the piston body 21 is produced by means of a forging process.
  • shank wall extensions 26 ' are integrally formed on the shank walls 26 during forging.
  • the forging method provided according to the invention also makes it possible to define the contour of the skirt wall extensions 26 ', so that in the finished piston 10, the passage opening 33 for the connecting rod and possibly the recess 34 for the cooling oil access are completed without further processing steps.
  • skirt wall extensions 26 ' are bent radially inwardly in the direction of the piston center axis M by means of a suitable bending process, so that they form the radially inwardly extending bottom parts 31, 32 according to FIGS. 1 and 2 as well as the passage opening 33 and possibly the recess 34 ,
  • At least one depression 36, 37 for example, during forging or by means of an embossing process, can be introduced at the surface of a bottom part or both bottom parts 31, 32 which acts as an oil collection container. so that the cooling effect is enhanced.
  • At least one bearing surface 35 can be introduced, in order to carry out further processing steps, in particular a machining finish of the piston 10 to provide a support of the piston 10 in a clamping device.
  • This bearing surface 35 is removed after the finishing of the piston 10 again.
  • the support surface 35 may, for example, during the forging of the skirt wall extensions 26 'or after bending by partial punching of the bottom parts 31, 32, in particular during the production of the recesses 36, 37, are introduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (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 (10) comportant une tête de piston (10a) et une tige de piston (10b), la tige de piston (10b) présentant des bossages d'axe (24) opposés munis d'alésages de bossage (25) ainsi que des parois de tige (26) opposées munies de surfaces de contact (27), un élément de recouvrement étant placé au niveau de l'extrémité inférieure du piston (10). Selon l'invention, l'élément de recouvrement est réalisé au niveau des extrémités libres des parois de tiges (26) opposées sous la forme d'éléments de fond (31, 32) s'étendant radialement vers l'intérieur et produits d'un seul tenant avec les parois de tige (26).
EP14799668.0A 2013-10-30 2014-10-28 Piston destiné à un moteur à combustion interne et procédé de fabrication dudit piston Withdrawn EP3063400A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310018250 DE102013018250A1 (de) 2013-10-30 2013-10-30 Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
PCT/EP2014/002896 WO2015062718A1 (fr) 2013-10-30 2014-10-28 Piston destiné à un moteur à combustion interne et procédé de fabrication dudit piston

Publications (1)

Publication Number Publication Date
EP3063400A1 true EP3063400A1 (fr) 2016-09-07

Family

ID=51904950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14799668.0A Withdrawn EP3063400A1 (fr) 2013-10-30 2014-10-28 Piston destiné à un moteur à combustion interne et procédé de fabrication dudit piston

Country Status (6)

Country Link
US (1) US20160273486A1 (fr)
EP (1) EP3063400A1 (fr)
JP (1) JP2016536512A (fr)
CN (1) CN105874192A (fr)
DE (1) DE102013018250A1 (fr)
WO (1) WO2015062718A1 (fr)

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396018A (en) * 1944-05-20 1946-03-05 John J Mis Piston construction
US2387344A (en) * 1944-11-23 1945-10-23 Packard Motor Car Co Internal-combustion engine
DE1058787B (de) * 1954-03-15 1959-06-04 Ottensener Eisenwerk Ag Gekuehlter Taucharbeitskolben fuer Brennkraftmaschinen
US3221718A (en) * 1964-01-09 1965-12-07 Continental Aviat & Eng Corp Piston construction
DE2539470C2 (de) * 1975-09-05 1984-09-20 Daimler-Benz Ag, 7000 Stuttgart Flüssigkeitsgekühlter Kolben für eine Brennkraftmaschine
JPS55106348U (fr) * 1979-01-23 1980-07-25
JPS647230Y2 (fr) * 1980-02-14 1989-02-27
DE3210771A1 (de) * 1982-03-24 1983-09-29 Günter 8543 Hilpoltstein Elsbett Kolbentrieb fuer hubkolben-brennkraftmaschinen, wie dieselmotoren u.a.
EP0316330B1 (fr) * 1986-08-01 1991-03-20 Ludwig Elsbett Partie superieure de piston a palier d'appui incorpore soutenant l'axe du piston de moteurs a pistons
DE3713241A1 (de) * 1986-12-24 1988-07-07 Mahle Gmbh Als rohling gegossener kopf eines zweiteiligen kolbens
DE4110306A1 (de) 1990-09-20 1992-03-26 Mahle Gmbh Tauchkolben aus leichtmetall fuer ottomotoren
JPH0960725A (ja) * 1995-08-25 1997-03-04 Toyota Motor Corp 内燃機関のピストン
AT1919U1 (de) * 1996-08-06 1998-01-26 Avl Verbrennungskraft Messtech Brennkraftmaschine mit innerer verbrennung
US6668703B2 (en) * 2000-10-03 2003-12-30 Christopher Gamble Piston with oil trap
DE10110889C1 (de) * 2001-03-07 2002-10-02 Ks Kolbenschmidt Gmbh Verfahren zur Herstellung eines Kühlkanalkolbens, sowie ein nach dem Verfahren hergestellter Kühlkanalkolben
JP5063634B2 (ja) * 2009-03-12 2012-10-31 日立オートモティブシステムズ株式会社 内燃機関のピストン
DE102011119525A1 (de) * 2011-11-26 2013-05-29 Mahle International Gmbh Kolben für einen Verbrennungsmotor
CN104246191B (zh) * 2012-02-20 2016-11-16 费德罗-莫格尔公司 用于内燃机的活塞组件
BR112015025346A2 (pt) * 2013-04-05 2017-07-18 Federal Mogul Corp pistão produzido através do uso de técnicas de fabricação de aditivos

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015062718A1 *

Also Published As

Publication number Publication date
JP2016536512A (ja) 2016-11-24
CN105874192A (zh) 2016-08-17
DE102013018250A1 (de) 2015-04-30
US20160273486A1 (en) 2016-09-22
WO2015062718A1 (fr) 2015-05-07

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