EP2188513B1 - Piston en deux parties pour moteur à combustion interne - Google Patents

Piston en deux parties pour moteur à combustion interne Download PDF

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Publication number
EP2188513B1
EP2188513B1 EP08801217.4A EP08801217A EP2188513B1 EP 2188513 B1 EP2188513 B1 EP 2188513B1 EP 08801217 A EP08801217 A EP 08801217A EP 2188513 B1 EP2188513 B1 EP 2188513B1
Authority
EP
European Patent Office
Prior art keywords
piston
ring element
solder connection
radially
ring
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.)
Active
Application number
EP08801217.4A
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German (de)
English (en)
Other versions
EP2188513A1 (fr
Inventor
Jochen Kortas
Timo Estrum
Dieter Messmer
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
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Mahle International GmbH
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Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2188513A1 publication Critical patent/EP2188513A1/fr
Application granted granted Critical
Publication of EP2188513B1 publication Critical patent/EP2188513B1/fr
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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 
    • F02F3/0015—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
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0038—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by brazing

Definitions

  • the invention relates to a two-part piston for an internal combustion engine according to the preamble of claim 1.
  • DE-OS 24 34 902 is a multi-part piston for an internal combustion engine which has a base body, on the underside of two pin bosses are formed. On the underside of the body is connected to a piston skirt and on the top radially outward with a ring member. It is known from the above DE-OS also, for connecting the main body to the piston skirt and with the ring member a Lötsch Strukturbericht, ie, to use a brazing method. In this case, the ring element has a first solder joint on the radial inner side of the part of the piston crown formed by the ring element. Since both the part of the piston crown formed by the main body and by the ring element are very thin-walled, there is the disadvantage that the solder joint also has a very small axial length and thus a very low strength.
  • the ring element On the side facing away from the piston crown, the ring element is also connected to the base body via a relatively long, lower solder joint seen in the radial direction. If in this case the piston crown due to a pressure load due to the taking place in the combustion chamber cavity, explosive combustion of the fuel-air mixture and because of prevailing in the region of the piston crown, very high temperatures in the radial direction partly pressure and partly due to temperature expands, the ring element widened funnel-shaped, and the lower solder joint is subjected to a large tensile load.
  • the known from the prior art piston has the disadvantage that in the area of the lower solder joint no constructive measures are provided to reduce this tensile load on the lower solder joint.
  • Fig. 1 shows a piston 1 in an exploded view, which consists of a piston body 2 and a ring element 3.
  • the piston body 2 and the ring member 3 are made of AFP steel, ie, from a micro-alloyed, precipitation hardening, ferritic-pearlitic manganese-vanadium-based steel according to DIN EN 10267.
  • the piston body 2 and the ring member 3 are used in the assembly of the Soldered piston 1 with each other.
  • the ring member 3 forms the essential part of the annular piston crown 4 and has on its radial outer side a ring portion 5 to Recording in the figure not shown piston rings.
  • a round opening 7 is introduced, which is bounded near the piston head 4 by a first, cylindrical surface 8, which serves as a soldering surface during assembly of the piston 1.
  • the piston main body 2 consists of a substantially plate-shaped and round center part 9, on its underside facing away from the piston bottom 4, two opposing shaft elements 10 and two opposing and this shaft elements 10 interconnecting pin bosses 11 are formed.
  • the radially outer end faces 12 of the pin bosses 11 are set back relative to the radially outer boundary 13 of the middle part 9 in the direction of the piston axis 6.
  • a peripheral, channel-shaped recess 14 is formed radially outwardly, surrounded by a circumferential inner annular rib 15 arranged radially on the upper side of the middle part 9, the interior of which forms the combustion recess 16 of the piston 1.
  • the annular rib 15 and the combustion bowl 16 are not rotationally symmetrical to the piston axis 6, but have radially outward a dent 17 whose purpose is to improve the combustion of the fuel-air mixture in the combustion bowl 16.
  • the piston crown side, the boundary of the annular rib 15 is circular, so that a part of the piston head 4 'is formed thereof.
  • a radially outer, second cylindrical surface 18 is also formed, which also serves as a counterpart to the first surface 8 of the ring member 3 as a soldering surface and with the surface 8 an upper solder joint (23, see Fig. 3 ) between the ring member 3 and the piston body 2 forms.
  • the middle part 9 has on its upper side an annular, third surface 19, which serves as a soldering surface and with an in Fig. 1 not shown, on the lower end face of the ring member 3, fourth and also serving as a soldering surface 20 forms a lower solder joint between the ring member 3 and the piston body 2. (See also this Fig. 3 .)
  • Fig. 3 illustrated section through the piston along the piston axis 6 and the line III-III in Fig. 2 shows a radially outside of the ring member 3, radially inwardly of the annular rib 15 and bottom of the recess 14 of the central part 9 of the piston body 2 limited, annular, cooling channel 21, not shown in the figure and opening into the piston interior 22 ⁇ lzurios- and ⁇ labzhoukanäle , Shown are also formed by the first and second surfaces 8 and 18, axially aligned, upper solder joint 23 and formed by the third and fourth surfaces 19 and 20, radially oriented, lower solder joint 24 between the piston body 2 and the ring member third
  • the first surface 8 in this case represents the radially inner boundary of the piston crown 4 forming deck portion 25 of the ring member 3, wherein in the piston bottom side facing away from the deck area 25 an upwardly directed, circumferential recess 26 is formed, here a peripheral, upper, thinned wall area 49 forms.
  • the ratio between the length b of the upper solder joint 23 and the minimum thickness a of the upper thinned wall portion 49 is between 1 and 3, that is, 1 ⁇ b / a ⁇ 3.
  • the fourth surface 20 which forms the lower end face of the ring element 3
  • the recess 27 is disposed between the ring portion 5 and the lower solder joint 24.
  • Fig. 4 is an embodiment of the piston 1 'in the region of the cooling channel 21' shown, in which the upper deck portion 25 'of the ring member 3 "in the region of the upper, thinned wall portion 49 radially inward only extends to the region of lowest wall thickness a and here a radial inner, cylindrical surface 31 forms, which forms an upper solder joint 32 with a radially outer, cylindrical surface 29 of a piston crown side integrally formed on the annular rib 15, circumferential and radially outwardly directed collar 30.
  • the surface 29 is delimited by a step-shaped circumferential molding 34 on which the radially inner end of the cover region 25 'rests.
  • the recesses 47 and 48 are arranged between the lower solder joint 33 and the ring portion 5. .
  • Fig. 5 shows an embodiment of the piston 1 ", in which the solder joint 24 'of the conically downwardly tapering, lower end face 37 of the ring member 3' and of the conically tapering down surface 38 is formed, wherein the surface 38 is the radially outer Area of the central part 9 "limited piston bottom side.
  • the piston 1 according to the invention is produced by first forging a blank 39 for the piston main body 2 and a blank 40 for the ring element 3, as described in US Pat Fig. 6 are shown in which the two blanks 39 and 40 are shown hatched, and in the piston 1 ultimately produced from this is shown in dashed lines within the hatched area.
  • the ring member 3 can also be made by the method of rolling or drawing.
  • the piston bottom side, radially inner edge of the blank 40 with a chamfer 41 and the piston bottom side, radially outer edge of the blank 39 are provided with a chamfer 42, which, like Fig. 6 shows, a wedge-shaped in section, circumferential recess 43 result when the two blanks 39 and 40 are assembled.
  • a circumferential, in section at least approximately rectangular projection 44 is integrally formed. Both the recess 43 and the projection 44 have in the context of the joining of the two blanks by means of the Lot explained below in more detail purpose.
  • the two blanks 39 and 40 are soldered together.
  • a gap with this width is already achieved in that both the surfaces 8 and 18 and the surface 19 and 20 are brought into contact with each other without positive locking.
  • the recess 43 and the piston bottom side surface of the projection 44 are then coated with a nickel-based solder paste, after which the two blanks 39, 40 including solder paste are heated to 1150 ° C.
  • the solder paste liquefies here and penetrates due to the capillary effect between the surfaces 8 and 18 and the surfaces 19 and 20, wherein the liquefied solder enforces a gap with the above dimensions between the surfaces 8 and 18 and between the surfaces 19 and 20 due to the capillary action.
  • the surfaces 8, 18, 19 and 20 are completely wetted.
  • the solder paste solidifies and results in a defect-free solder joint between the two partially processed blanks 39 and 40.
  • the gap between the surfaces 29 and 31 of the upper solder joint 32 of 10 .mu.m to 200 .mu.m which is sufficient for an error-free solder connection is achieved by machining the surfaces 29 and 31 by means of a fine-turning method insofar as the gap between the two surfaces 29 and 31 having the above dimensions of 10 .mu.m to 200 .mu.m, after the collar 36 is fixed in the recess 35 with close clearance.
  • the Anformung 34 on which passes in the assembly of the piston 1 'of the cover portion 25' of the ring member 3 "to the plant, here ensures that the piston crown side end face 51 of the collar 36 and the shaft-side inner surface 52 of the recess 35 after the piston assembly a distance from 10 .mu.m to 200 .mu.m apart from each other, so that here too results in a sufficiently wide gap for an error-free solder joint.
  • the application of the soldering method for connecting the two piston parts has the advantage that the soldering temperature of 1150 ° C, to which the piston is heated in this case, is equal to the forging temperature, with which the two blanks 39 and 40 are forged so that when cooling specifically can be adjusted for the AFP steel typical material properties.
  • the piston 1 is completed by the in Fig. 6 dashed lines, rotationally symmetrical outer contours of the piston 1 by turning and also dashed lines, non-rotationally symmetrical boundary surfaces 46 of the combustion bowl 16 are made by milling. In this case it is also possible to weld the piston base body 2, 2 ', 2 "and the ring element 3, 3', 3" together.

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)

Claims (7)

  1. Piston en deux parties (1, 1', 1") pour un moteur à combustion interne,
    - constitué d'un corps de base de piston (2, 2', 2") et d'un élément annulaire (3 3' 3"),
    - dans lequel le corps de base de piston (2, 2', 2") présente une pièce centrale ronde sensiblement en forme de plaque (9, 9', 9"), dont le diamètre radial est au moins approximativement identique au diamètre radial du piston (1, 1', 1"),
    - dans lequel sont formés sur la partie inférieure de la pièce centrale (9, 9', 9") deux éléments de fût (10) en regard l'un de l'autre et deux moyeux de boulon (11) reliant l'un à l'autre les éléments de fût (10) et
    - dans lequel est formée sur la partie supérieure de la pièce centrale (9, 9', 9") une nervure annulaire périphérique (15) repoussée par rapport au bord radialement externe de la pièce centrale (9, 9', 9") dans la direction de l'axe du piston (6), laquelle nervure forme la limite radialement externe d'une chambre de combustion (16),
    - dans lequel l'élément annulaire (3, 3', 3") présente sur sa face externe radiale une partie annulaire (5) et
    - dans lequel l'élément annulaire (3, 3', 3") est brasé avec le corps de base de piston (2, 2', 2") via une brasure supérieure (23, 32) de longueur b, qui est agencée sur la face interne radiale d'une tête de piston (4) formée au moins en partie par l'élément annulaire (3, 3', 3") et via une brasure inférieure (24, 24', 33) de longueur c, qui est agencée radialement vers l'extérieur sur la face supérieure de la pièce centrale (9, 9', 9"),
    caractérisé en ce que l'élément annulaire (3, 3', 3") présente, d'une part, dans la zone de la tête de piston (4) radialement à l'extérieur de la brasure supérieure (23, 32) une zone de paroi supérieure amincie périphérique (49) et, d'autre part, entre la partie annulaire (5) et la brasure inférieure (24, 24', 33) une zone de paroi inférieure amincie périphérique (50, 50'),
    dans lequel l'épaisseur (a) de la zone de paroi supérieure amincie (49) a une valeur plus faible que la longueur (b) de la brasure supérieure (23, 32) et dans lequel l'épaisseur (d) de la zone de paroi inférieure amincie (50, 50') a une valeur plus faible que la longueur (c) de la brasure inférieure (24, 24', 33).
  2. Piston (1, 1', 1") selon la revendication 1, caractérisé en ce que le rapport entre la longueur (b) de la brasure supérieure (23, 32) et l'épaisseur (a) de la zone de paroi supérieure amincie (49) est plus grand que 1 et plus petit que 3 de sorte que 1<b/a<3.
  3. Piston (1, 1', 1") selon la revendication 1 ou 2, caractérisé en ce que le rapport entre la longueur (c) de la brasure inférieure (24, 24', 33) et l'épaisseur (d) de la zone de paroi inférieure amincie (50, 50') est plus grande que 1 et plus petite que 3 de sorte que 1 < c/d < 3.
  4. Piston (1, 1") selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément annulaire (3, 3') présente une zone de couverture (25) formant en partie la tête du piston (4), dans lequel est ménagée, dans la partie de la zone de couverture (25) opposée à la tête de piston, une cavité périphérique (26) tournée vers le haut qui forme la zone de paroi supérieure amincie (49).
  5. Piston (1, 1") selon l'une quelconque des revendications précédentes, caractérisé en ce que, entre la brasure inférieure (24, 24') et la partie annulaire (5), dans la face interne radiale de l'élément annulaire (3, 3'), est ménagée une cavité périphérique (27) tournée radialement vers l'extérieur, qui forme la zone de paroi inférieure amincie (50).
  6. Piston (1') selon l'une quelconque des revendications 1 à 4, caractérisé en ce que, entre la brasure inférieure (33) et la partie annulaire (5), dans la face interne radiale de l'élément annulaire (3"), sont ménagées une cavité périphérique (47) tournée radialement vers l'intérieur et, dans la face externe radiale de l'élément annulaire (3"), une cavité périphérique (48) tournée radialement vers l'intérieur, et les deux cavités (47, 48) sont en regard l'une de l'autre et forment la zone de paroi inférieure amincie (50').
  7. Piston (1") selon l'une quelconque des revendications précédentes, caractérisé en ce que la brasure inférieure (24') est formée par une face frontale inférieure (37) de l'élément annulaire (3') s'amincissant en cône vers le bas et par une face (38) qui s'amincit également en cône vers le bas et qui délimite la zone radialement externe de la pièce centrale (9") côté tête de piston.
EP08801217.4A 2007-09-15 2008-08-23 Piston en deux parties pour moteur à combustion interne Active EP2188513B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007044106A DE102007044106A1 (de) 2007-09-15 2007-09-15 Zweiteiliger Kolben für einen Verbrennungsmotor
PCT/DE2008/001394 WO2009033446A1 (fr) 2007-09-15 2008-08-23 Piston en deux parties pour moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2188513A1 EP2188513A1 (fr) 2010-05-26
EP2188513B1 true EP2188513B1 (fr) 2017-03-01

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ID=39967409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08801217.4A Active EP2188513B1 (fr) 2007-09-15 2008-08-23 Piston en deux parties pour moteur à combustion interne

Country Status (7)

Country Link
US (1) US8225765B2 (fr)
EP (1) EP2188513B1 (fr)
JP (1) JP5295245B2 (fr)
KR (1) KR101484352B1 (fr)
CN (1) CN101802381B (fr)
DE (1) DE102007044106A1 (fr)
WO (1) WO2009033446A1 (fr)

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WO2009079989A2 (fr) * 2007-12-20 2009-07-02 Mahle International Gmbh Procédé de fixation d'un élément annulaire sur un piston pour un moteur à combustion interne
DE102008038325A1 (de) 2007-12-20 2009-06-25 Mahle International Gmbh Verfahren zum Befestigen eines Ringelementes auf einem Kolben für einen Verbrennungsmotor
DE102007061601A1 (de) * 2007-12-20 2009-06-25 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
DE102009032941A1 (de) 2009-07-14 2011-01-20 Mahle International Gmbh Mehrteiliger Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
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US20110197845A1 (en) * 2010-02-17 2011-08-18 William Flowers Piston assembly
US9856820B2 (en) 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly
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US20160061326A1 (en) 2012-08-23 2016-03-03 Ks Kolbenschmidt Gmbh Joined connection on a two-piece steel piston and joining method
EP2900992A1 (fr) * 2012-09-27 2015-08-05 KS Kolbenschmidt GMBH Piston en deux parties pour moteur à combustion interne
KR101582950B1 (ko) * 2015-04-30 2016-01-06 동양피스톤 주식회사 내연기관용 피스톤 및 이를 제작할 수 있는 냉각 채널 코어
EP3377748A1 (fr) * 2015-11-17 2018-09-26 KS Kolbenschmidt GmbH Piston pour moteur à combustion interne
KR101593543B1 (ko) * 2016-01-04 2016-02-16 동양피스톤 주식회사 내연기관용 피스톤
MX2018013353A (es) 2016-05-04 2019-02-20 Ks Kolbenschmidt Gmbh Piston.
RU195093U1 (ru) * 2018-09-17 2020-01-15 Публичное акционерное общество "Автодизель" (Ярославский моторный завод) Поршень двигателя внутреннего сгорания
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DE102021207405A1 (de) * 2021-07-13 2023-01-19 Federal-Mogul Nürnberg GmbH Stahlkolben für einen Verbrennungsmotor

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Also Published As

Publication number Publication date
US8225765B2 (en) 2012-07-24
JP5295245B2 (ja) 2013-09-18
EP2188513A1 (fr) 2010-05-26
KR101484352B1 (ko) 2015-01-19
KR20100069646A (ko) 2010-06-24
JP2010539369A (ja) 2010-12-16
US20100307445A1 (en) 2010-12-09
CN101802381B (zh) 2015-11-25
CN101802381A (zh) 2010-08-11
DE102007044106A1 (de) 2009-03-19
WO2009033446A1 (fr) 2009-03-19

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