EP3374622A1 - Heat input zone of a piston, having a groove flank positioned in said heat input zone - Google Patents
Heat input zone of a piston, having a groove flank positioned in said heat input zoneInfo
- Publication number
- EP3374622A1 EP3374622A1 EP16797799.0A EP16797799A EP3374622A1 EP 3374622 A1 EP3374622 A1 EP 3374622A1 EP 16797799 A EP16797799 A EP 16797799A EP 3374622 A1 EP3374622 A1 EP 3374622A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- annular groove
- flank
- piston
- joining plane
- plane
- 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- Withdrawn
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
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/18—Making machine elements pistons or plungers
- B21K1/185—Making machine elements pistons or plungers with cooling channels
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/003—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
- F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
Definitions
- the invention relates to a piston of an internal combustion engine, comprising an upper part and a lower part, which are joined together in the region of a joint plane by means of a friction welding, wherein the piston has at least one circumferential annular groove, according to the features of the preamble of claim 1
- the invention is based on a piston, in particular a cooling channel piston, as is known from DE 10 2010 033 881 A1.
- the finished for later operation piston is formed of an upper part and a lower part, both of which are interconnected by friction welding.
- an annularly closed cooling channel is formed, which is formed by the upper part and the lower part.
- the cooling channel piston known from DE 10 2010 033 881 A1 has friction welding surfaces lying concentrically in one another, thus two friction welding zones.
- a joining plane in the region of the ring field is arranged approximately centrally between two annular grooves in the lying between the two annular grooves web. This creates a heat-affected zone directly above and directly below this joining plane. Towards the outside, approximately at the level of this heat-affected zone, the friction weld is formed, which subsequently has to be removed from the surface of the piston, so that the piston in the cylinder of the piston has an effect Internal combustion engine can be used. The removal of the Reibsch spawulst takes place up to the surface of the piston, which later has the finished measure of the operation of the piston in the cylinder of the internal combustion engine.
- the invention has for its object to improve the known piston in terms of its durability.
- the joining plane between the upper flank (the plane in which the upper flank lies, enclosing or deviating therefrom) and the lower flank (the plane in which the lower flank lies, enclosing or deviating therefrom) of the annular groove is located and a by the application of the friction welding process adjusting heat affected zone includes at least the upper flank and / or the lower flank of the annular groove.
- the present invention is concerned with the fact that the heat-affected zone extends into an annular groove.
- This has the advantage that in the processing of the weld beads, which arise during friction welding, machining can not only be done down to the outer surface of the cylindrical piston, but a deeper processing is done to remove the Reibsch spawulst and at the same time either an existing ring groove To free from there penetrated Reibsch spawulst or in the heat affected zone and possibly also below or overlying areas of the annular groove (when viewing the Kolbenhubachse) contribute.
- hardening of the Nutoberflanke or Nutunterfianke depending on where the joining plane is located in an advantageous manner.
- the joining plane is approximately centrally (either exactly centered or slightly different from the center, for example, less than or equal to 30% of the height of the annular groove) between the upper edge and the lower edge of the lowermost annular groove and the adjusting Heat affected zone the upper flank and includes the lower flank of the lowermost annular groove.
- the hardening of at least one groove flank, but also of both groove flanks, of the upper annular grooves (which face the cylinder chamber) is not sufficient. Therefore, other methods of curing (such as laser remelting) are required for these annular grooves.
- the curing by the heat-affected zone, which occurs in the friction welding process is sufficient. This is generally true in the application of any type of rings used in this lowest ring groove rings.
- the hardening by the heat affected zone, which occurs in the friction welding is particularly effective in a three-piece ⁇ labstreifring, as this is given if at all a very low wear of the adjacent surfaces of groove flank and ⁇ labstreifring.
- FIG. 1 shows a piston which consists of an upper part 1 and a lower part 2.
- the two parts 1 and 2 have mutually assigning joining surfaces, which are joined together in a joining plane 3 inextricably by means of a friction welding process.
- the joining plane 3 is approximately centrally between a top edge and a lower edge of an annular groove 4.
- the position of the joining plane 3 is exactly in the middle between these two edges, the position of the joining plane 3 also from this central position up or down (at View of Figure 1) may be moved.
- the joining plane 3 can even be provided in the same plane in which the upper flank or lower flank of the annular groove 4 is arranged.
- Reibsch By Reibsch experience compiler creates a heat affected zone 5 (shown in dark gray), wherein initially after joining the two parts 1, 2 by means of Reibsch consultantss the annular groove 4 is not yet available. This is introduced by appropriate processing, for example, a machining process, in the self-adjusting heat affected zone 5 (eg stabbed).
- the geometry (cross-section) of the annular groove 4 is chosen so that it is completely within the self-adjusting heat infiltration zone 5.
- a Reibsch spawulst 6, which is arranged in a cooling channel 7 is formed.
- the cooling channel 7 may, but need not, be formed together by the upper part 1 and the lower part 2.
- the joining plane 3 is located between the upper flank and the lower flank of the annular groove 4, wherein in this particular case, the joining plane 3 is located centrally between the upper flank and the lower flank of the annular groove 4.
- This central arrangement of the joining plane 3 can also be shifted in the direction of the upper flank or the lower flank of the annular groove 4. It is even conceivable that the joining plane 3 is located in the plane of the upper flank of the annular groove 4 or the joining plane 3 in the plane of the lower flank of the annular groove 4.
- the self-adjusting heat-affected zone 5 includes both the upper flank and the lower flank of the annular groove 4 and extends over a certain range even further upwards and downwards (as viewed in FIG. 1).
- the joining plane 3 is located in the plane of the upper flank of the annular groove 4, and the heat-influencing zone 5 which adjoins encloses the upper flank of the annular groove 4.
- the heat-affected zone includes at least the lower flank and / or the upper flank and further regions beyond the annular groove 4, of course, the heat-affected zone 5 also includes the groove base into the inner wall of the cooling channel 7.
- the third (bottom) annular groove is hardened by friction welding, which is particularly advantageous in a three-piece oil ring.
- the joining plane of the outer or single friction welded joint between the upper part and lower part is not centered in the web between two annular grooves (as in DE 10 2010 033 881 A1), but the friction welding zone and Thus, the heat affected zone extends into the annular groove and possibly also behind it areas (up to the beginning of the cooling channel) into it.
- the heat-affected zone is shown in the region of the respective Nutoberflanke, can also be considered to provide the heat affected zone in the region of Nutunterflanke.
- the heat input can be used by the friction welding process for the subsequent curing process in an advantageous manner.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015222009 | 2015-11-09 | ||
DE102015225953 | 2015-12-18 | ||
PCT/EP2016/077037 WO2017081036A1 (en) | 2015-11-09 | 2016-11-09 | Heat input zone of a piston, having a groove flank positioned in said heat input zone |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3374622A1 true EP3374622A1 (en) | 2018-09-19 |
Family
ID=57345894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16797799.0A Withdrawn EP3374622A1 (en) | 2015-11-09 | 2016-11-09 | Heat input zone of a piston, having a groove flank positioned in said heat input zone |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180328311A1 (en) |
EP (1) | EP3374622A1 (en) |
CN (1) | CN108350828A (en) |
DE (1) | DE102016121444A1 (en) |
MX (1) | MX2018004728A (en) |
WO (1) | WO2017081036A1 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6327962B1 (en) * | 1999-08-16 | 2001-12-11 | Caterpillar Inc. | One piece piston with supporting piston skirt |
JP2001082247A (en) * | 1999-09-20 | 2001-03-27 | Riken Tanzou Kk | Manufacture of internal combustion engine piston |
DE102004003980A1 (en) * | 2004-01-27 | 2005-08-11 | Mahle Gmbh | Enclosed coolant tube manufacturing method for use in piston, involves incorporating coolant tube with circular opening in piston, and fixing tube cover in opening using adhesives to cover opening, where tube is made of forged steel |
DE102004061778A1 (en) * | 2004-09-29 | 2006-04-06 | Ks Kolbenschmidt Gmbh | Simple friction weld |
DE102008034430B4 (en) * | 2008-07-24 | 2015-02-19 | Ks Kolbenschmidt Gmbh | Friction welded steel piston with optimized cooling channel |
JP2013500425A (en) * | 2009-07-25 | 2013-01-07 | カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for cooling a piston and cooled piston |
DE102010033881A1 (en) * | 2010-08-10 | 2012-02-16 | Mahle International Gmbh | Piston for an internal combustion engine and method for its production |
US9216474B2 (en) * | 2012-04-24 | 2015-12-22 | Industrial Parts Depot, Llc | Two-piece friction-welded piston |
-
2016
- 2016-11-09 WO PCT/EP2016/077037 patent/WO2017081036A1/en active Application Filing
- 2016-11-09 CN CN201680064856.2A patent/CN108350828A/en active Pending
- 2016-11-09 EP EP16797799.0A patent/EP3374622A1/en not_active Withdrawn
- 2016-11-09 DE DE102016121444.2A patent/DE102016121444A1/en not_active Ceased
- 2016-11-09 MX MX2018004728A patent/MX2018004728A/en unknown
- 2016-11-09 US US15/773,318 patent/US20180328311A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE102016121444A1 (en) | 2017-05-11 |
US20180328311A1 (en) | 2018-11-15 |
CN108350828A (en) | 2018-07-31 |
MX2018004728A (en) | 2018-07-06 |
WO2017081036A1 (en) | 2017-05-18 |
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