EP2603348A1 - Procédé pour produire un piston destiné à un moteur à combustion interne et piston destiné à un moteur à combustion interne - Google Patents

Procédé pour produire un piston destiné à un moteur à combustion interne et piston destiné à un moteur à combustion interne

Info

Publication number
EP2603348A1
EP2603348A1 EP11787583.1A EP11787583A EP2603348A1 EP 2603348 A1 EP2603348 A1 EP 2603348A1 EP 11787583 A EP11787583 A EP 11787583A EP 2603348 A1 EP2603348 A1 EP 2603348A1
Authority
EP
European Patent Office
Prior art keywords
piston
joining surface
joining
internal combustion
combustion engine
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Withdrawn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
EP11787583.1A
Other languages
German (de)
English (en)
Inventor
Frank Schnaiter
Rainer Scharp
Karlheinz Bing
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 EP2603348A1 publication Critical patent/EP2603348A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/04—Flash butt welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • B23K13/015—Butt welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/06—Welding by high-frequency current heating characterised by the shielding of the welding zone against influence of the surrounding atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • B23K20/023—Thermo-compression bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • B23K20/028—Butt welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/129—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding specially adapted for particular articles or workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/227—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded with ferrous layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/24—Preliminary treatment
    • 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
    • F02F3/003—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/003—Pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/06—Cast-iron alloys
    • 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
    • Y10T29/49256—Piston making with assembly or composite article making

Definitions

  • the present invention relates to a method of manufacturing a piston for an internal combustion engine.
  • this process must be carried out under a protective gas atmosphere in order to prevent the heated joining surfaces from being adversely affected or adversely affected by reaction, for example with atmospheric oxygen.
  • the object of the present invention is to provide a method for producing a piston for an internal combustion engine, in which the simplest possible way an improved weld joint is achieved.
  • the solution consists in that first in a step a) a piston upper part is produced with at least one joining surface, in a step b) a piston lower part is produced with at least one joining surface, in a step c) a direct contact between the at least one joining surface of the piston upper part and the at least one joining surface of the piston lower part is produced, in a step d) the piston upper part and the piston lower part are heated by induction or by a direct current flow over the joining surfaces in the area of the joining surfaces brought into direct contact, and in a step e) the piston top - part and the piston lower part are connected to a piston by pressing together.
  • a direct contact between the joining surfaces of piston upper part and piston lower part is produced before the heating in the area of the joining surfaces is carried out in order to connect the two components in the area of their heated joining surfaces. Cooling of the joining surfaces before connecting the piston upper part and piston lower part is thus avoided, so that the resulting welded joint is qualitatively improved compared to the prior art. Furthermore, working under a protective gas atmosphere can be dispensed with, since the heated joining surfaces do not come into contact with the ambient air.
  • the joining surfaces are either inductive, i. heated by induced eddy currents, or by direct current flow and then by a pressing operation, i. by mechanical force effect, linked together. If necessary, the piston can be finished.
  • the present invention furthermore relates to a piston which can be produced according to the method according to the invention.
  • the present invention is finally a piston for an internal combustion engine, having a piston upper part and a piston lower part, wherein the piston has, wherein the piston lower part has an inner and an outer joining surface, wherein piston upper part and piston lower part form a circumferential cooling channel and the inner joining surfaces a predetermined Have width a, the inner joining surface of the piston lower part is formed by a circumferential support member having the axial length b with b> 1, 5 * a, below the rotating support member a cooling channel side circumferential constriction with a depth c with c ⁇ 0.8 * a is present.
  • the peripheral wall of the combustion bowl which separates the combustion bowl from the circulating cooling channel, has a predetermined thickness, which consists of a predetermined width a the inner joining surfaces of piston upper part and piston lower part results.
  • the inner joining surface of the piston lower part is formed by a circumferential support member of the piston lower part, the axial length b is at least one and a half times the width a of the inner support surfaces of Koibenunterteii and Koibenoberteii.
  • a cooling channel-side circumferential constriction is furthermore provided, the depth c of which is at most 0.8 times the width a of the support surfaces of the piston lower part and upper piston part.
  • the width a depends on the size and the dimensions of the piston in the individual case. It is essential that the length b of the support element and the depth c of the constriction are dimensioned as a function of the width a of the support surfaces.
  • This structure provides an optimal compromise between piston stability requirements and the need to size the support surfaces to be welded rather small in order to optimize the delivery of heat and pressure during the welding operation. With the embodiment according to the invention it is achieved that the peripheral wall of the combustion bowl does not yield during the welding process, so that when removing the contact pressure no cracks occur in the weld.
  • the embodiment according to the invention causes the ignition pressure and the ignition heat to be discharged particularly well into the lower piston regions during engine operation.
  • a preferred embodiment of the method according to the invention is that in the region of the at least one joining surface of the upper piston part and / or the at least one joining surface of the piston lower part, a taper is provided which in step e) with the material of Koibenoberteii or piston lower part, preferably to the nominal cross section the joining surfaces, is filled.
  • the taper may be formed, for example, as a groove, notch or constriction.
  • the pressing operation may preferably be combined with a turning operation, i. Piston upper part and lower piston part are, for example. By a few degrees, rotated against each other to further strengthen the weld.
  • a further preferred development of the method according to the invention provides that the upper piston part has a combustion recess and an inner and an outer joining surface, that the lower piston part has an inner and an outer joining surface and that a circumferential cooling channel is formed when connecting piston upper part and lower piston part.
  • a cooling channel piston can be produced in a particularly simple manner. Since the joining surfaces of the upper piston part are accessible either from the outer surface of the piston upper part or from the combustion bowl forth, the inventive method is well suited for the production of such cooling channel piston.
  • the method according to the invention advantageously allows the lower part of the partition to be arranged in the same plane, or the joining surfaces of upper piston part and lower piston part to be arranged in at least two different planes. An offset of the joining surfaces is therefore not a problem.
  • the upper piston part and / or the lower piston part can be, for example, castings or forgings, and, for example, be made of a steel material or a cast iron material.
  • the constriction advantageously extends to the bottom of the cooling channel in order to further optimize the dissipation of heat and pressure, taking into account the material volume.
  • FIG. 1 shows a section through a first embodiment of a piston according to the invention prior to welding.
  • FIG. 2 shows the piston according to FIG. 1 in section, the illustration being rotated by 90 ° with respect to FIG. 1;
  • FIG. 2 shows the piston according to FIG. 1 in section, the illustration being rotated by 90 ° with respect to FIG. 1;
  • FIG. 3 shows the piston according to FIG. 1 after welding
  • FIG. 4 shows the piston according to FIG. 3 in section, the illustration being rotated by 90 ° with respect to FIG. 3;
  • FIG. 5 shows a section through a further embodiment of a piston according to the invention prior to welding
  • FIG. 6 shows the piston according to FIG. 5 in section, the illustration being rotated by 90 ° with respect to FIG. 5;
  • FIG. 6 shows the piston according to FIG. 5 in section, the illustration being rotated by 90 ° with respect to FIG. 5;
  • FIG. 7 shows the piston according to FIG. 5 after welding
  • FIG. 8 shows the piston according to FIG. 7 in section, the illustration being rotated by 90 ° with respect to FIG. 7;
  • FIG. 8 shows the piston according to FIG. 7 in section, the illustration being rotated by 90 ° with respect to FIG. 7;
  • FIG. 9 shows a section through a further embodiment of a piston according to the invention.
  • FIG. 10 is an enlarged partial view of the piston of FIG. 9th
  • Figures 1 to 4 show a first embodiment of a method according to the invention with reference to a piston 10.
  • the piston 10 is inlitisbetspiel a Two-piece box piston with circumferential cooling channel.
  • the present invention is also suitable for other types of pistons.
  • the piston 10 is composed of a piston upper part 11 and a piston lower part 12, which can be made, for example, from a steel material or a cast iron material, for example by casting or forging.
  • the piston 10 has a piston head 13 with a combustion bowl 14, wherein the piston head 13 and combustion bowl 14 are partially formed by the piston upper part 11 and partially by the piston lower part 12. Flank and annular grooves along the outer wall portion 18 have not been shown for clarity.
  • the piston lower part 12 has a piston shaft 15 and piston hubs 16 with hub bores 17 for receiving a piston pin (not shown).
  • the upper piston part 11 has an inner joining surface 21 and an outer joining surface 22.
  • the inner joint surface 21 is annularly formed in the region of the combustion bowl 14.
  • the outer joining surface 22 is formed in the embodiment below the wall portion 18.
  • the lower piston part 12 likewise has an inner joining surface 23 and an outer joining surface 24.
  • the inner joining surface 23 is formed corresponding to the inner joining surface 22 of the piston upper part 11 in the region of the combustion bowl 14 annularly encircling.
  • the outer joining surface 24 is formed in the embodiment in an extension of the piston shaft 15.
  • the inner joining surfaces 21, 23 of the upper piston part 11 and the lower piston part 12 are arranged in the exemplary embodiment offset from the outer joining surfaces 22, 24 of the upper piston part 1 and the lower piston part 12.
  • the upper piston part 11 and the lower piston part 12 form a circumferential cooling channel 25.
  • the piston 10 is made as follows from the upper piston part 1 and the lower piston part 12. First, as can be seen in FIGS. 1 and 2, there is a direct contact between the corresponding inner joining surfaces 21, 23 of the upper piston part 11 and the lower piston part 12 and between the corresponding outer joint surfaces 22, 24 of the upper piston part 11 and the lower piston part 12, respectively produced. The inner joining surfaces 21, 22 and the outer joining surfaces 23, 24 are thus directly adjacent to each other.
  • An induction coil 31 is positioned in the region of the combustion bowl 14 and assigned to the inner joining surfaces 21, 23 of piston upper part 11 and piston lower part 12.
  • a further induction coil 32 is positioned in the region of the outer wall 18 and assigned to the outer joining surfaces 22, 24 of upper piston part 1 and lower piston part 12, respectively.
  • the upper piston part 11 and the lower piston part 12 are heated by induction in the region of their joining surfaces 21, 23 and 22, 24, respectively, until the material becomes plastically deformable in this region. Then piston upper part 11 and lower piston part 12 are connected to each other by a pressing operation, wherein piston upper part 11 and lower piston part 12 can be rotated by a few degrees against each other.
  • FIGS. 3 and 4 show the piston 10 obtained after connecting piston upper part 11 and piston lower part 12.
  • Small peripheral beads 26 are formed along the weld seams and are formed during the pressing process when the upper piston part 11 and lower piston part 12 are connected by laterally emerging material.
  • the piston 10 can be reworked, in particular by introducing annular grooves and removing the externally accessible beads 26th
  • FIGS. 5 to 8 show a further exemplary embodiment of a method according to the invention with reference to a piston 110 comprising a piston upper part 111 and a piston lower part 112.
  • the piston 110 is almost identical to the piston 10 according to FIGS. 1 to 4, so that the same reference symbols are used for identical structures and to the description of FIGS. 1 to 4.
  • the essential difference between the piston 10 according to FIGS. 1 to 4 and the piston 110 according to FIGS. 5 to 8 and between the methods according to the invention used for producing it is that the piston upper part 111 and the piston lower part 112 in the region of their joining surfaces 121, 123 or 122, 124 in the assembled, but not yet welded state tapers 127, 128 have.
  • the tapers 127, 128 are formed in the embodiment as constrictions and are in the embodiment by introducing chamfers 129 at the corresponding joining surfaces 121, 123 and 122, 124th produced.
  • the tapers are filled up with material emerging laterally from the weld seams.
  • FIGS. 7 and 8 it can be seen that after the connection of Koibenoberteii 111 and Koibenunterteii 112 in the region of the welds no beads are present, but a largely smooth surface is formed.
  • Figures 9 and 10 show a further embodiment of a piston 210 according to the invention.
  • the piston 210 substantially corresponds to the piston 10 according to Figures 1 to 4, so that reference is made to the above description.
  • Like reference numerals have been used for matching structures.
  • the piston 210 is composed of a piston upper part 211 and a lower piston part 212, which can be made, for example, from a steel material or a cast iron material, for example by casting or forging.
  • the piston 210 has a piston head 13 with a combustion bowl 14, wherein the piston head 13 and combustion bowl 14 are partially formed by the piston upper part 11 and partly by the Koibenunterteii 12. Flank and annular grooves along the outer wall portion 18 have not been shown for clarity.
  • the piston lower part 12 has a piston shaft 15 and piston hubs 16 with hub bores 17 for receiving a piston pin (not shown).
  • the upper piston part 211 has an inner joining surface 21 and an outer joining surface 22.
  • the inner joint surface 21 is annularly formed in the region of the combustion bowl 14.
  • the outer joining surface 22 is formed in the embodiment below the wall portion 18.
  • the lower piston part 212 likewise has an inner joining surface 23 and an outer joining surface 24.
  • the inner joint surface 23 is formed corresponding to the inner joining surface 22 of the upper piston part 211 in the region of the combustion bowl 14 annularly encircling.
  • the outer joining surface 24 is formed in the embodiment in an extension of the piston shaft 15.
  • the inner joining surfaces 21, 23 of the is arranged to the outer joining surfaces 22, 24 of the piston upper part 11 and the piston lower part 12.
  • the upper piston part 211 and the lower part 212 of the cylinder form a circumferential cooling channel 25.
  • the inner joining surfaces 21, 23 of upper piston part 211 and lower piston part 212 have a predetermined width a.
  • the inner joining surface 23 of the piston lower part 212 is formed by a circumferential support element 233.
  • the support element 233 has an axial length b, which is at least one and a half times the width a of the inner joining surfaces 21, 23: b> 1, 5 * a.
  • the support element 233 limits on the one hand the cooling channel 25 and on the other hand the combustion recess 14.
  • a cooling channel-side constriction 234 is provided below the support element 233.
  • the depth c of the constriction 234 is at most 0.8 times the width a of the inner support surfaces 21, 23: c ⁇ 0.8 * a.
  • This structure ensures the stability of the piston 210 according to the invention at the same time as slim as possible embodiment of the support surfaces 21, 23 and the support member 234 in order to obtain an optimal pressure-welded connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

La présente invention concerne un procédé pour produire un piston (10, 110, 210) destiné à un moteur à combustion interne, caractérisé par les étapes suivantes : production d'une partie supérieure de piston (11, 111, 211) comportant au moins une surface à assembler (21, 22; 121, 122), b) production d'une partie inférieure de piston (12, 112, 212) comportant au moins une surface à assembler (23, 24; 123, 124), c) établissement d'un contact direct entre ladite au moins une surface à assembler (21, 22; 121, 122) de la partie supérieure de piston (11, 111, 211) et ladite au moins une surface à assembler (23, 24; 123, 124) de la partie inférieure de piston (12, 112, 212), d) élévation de la température de la partie supérieure de piston (11, 111, 211) et de la partie inférieure de piston (12, 112, 212) dans la zone des surfaces à assembler (21, 23; 22, 24; 121, 123; 122, 124) mises en contact direct, par induction ou par l'intermédiaire d'un flux de courant direct sur les surfaces à assembler (21, 23; 22, 24; 121, 123;122, 124), e) assemblage de la partie supérieure de piston (11, 111, 211) et de la partie inférieure de piston (12, 112, 212) pour former un piston (10, 110, 210) par une opération de pressage et éventuellement finissage du piston (10, 110, 210).
EP11787583.1A 2010-08-10 2011-08-09 Procédé pour produire un piston destiné à un moteur à combustion interne et piston destiné à un moteur à combustion interne Withdrawn EP2603348A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010033879A DE102010033879A1 (de) 2010-08-10 2010-08-10 Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
PCT/DE2011/001564 WO2012019593A1 (fr) 2010-08-10 2011-08-09 Procédé pour produire un piston destiné à un moteur à combustion interne et piston destiné à un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2603348A1 true EP2603348A1 (fr) 2013-06-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11787583.1A Withdrawn EP2603348A1 (fr) 2010-08-10 2011-08-09 Procédé pour produire un piston destiné à un moteur à combustion interne et piston destiné à un moteur à combustion interne

Country Status (8)

Country Link
US (1) US20120037115A1 (fr)
EP (1) EP2603348A1 (fr)
JP (1) JP2013542355A (fr)
KR (1) KR20140007791A (fr)
CN (1) CN103118831A (fr)
BR (1) BR112013004071A2 (fr)
DE (1) DE102010033879A1 (fr)
WO (1) WO2012019593A1 (fr)

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JP2013542355A (ja) 2013-11-21
WO2012019593A1 (fr) 2012-02-16
BR112013004071A2 (pt) 2016-06-14
US20120037115A1 (en) 2012-02-16
DE102010033879A1 (de) 2012-02-16
KR20140007791A (ko) 2014-01-20

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