DE10141189A1 - Internal combustion engine piston shaft has shaft part remodeled by friction welding to form cast or conversion matrices specifically as piston boss. - Google Patents
Internal combustion engine piston shaft has shaft part remodeled by friction welding to form cast or conversion matrices specifically as piston boss.Info
- Publication number
- DE10141189A1 DE10141189A1 DE10141189A DE10141189A DE10141189A1 DE 10141189 A1 DE10141189 A1 DE 10141189A1 DE 10141189 A DE10141189 A DE 10141189A DE 10141189 A DE10141189 A DE 10141189A DE 10141189 A1 DE10141189 A1 DE 10141189A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- shaft
- remodeled
- 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.)
- Ceased
Links
Classifications
-
- 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
- B23K20/122—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 using a non-consumable tool, e.g. friction stir 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
- 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
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Die Erfindung betrifft einen Kolben einer Brennkraftmaschine gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1. The invention relates to a piston of an internal combustion engine according to the features the preamble of claim 1.
Kolben für Brennkraftmaschinen in verschiedenen Bauarten (z. B. einteilige Kolben oder Pendelschaftkolben) sind bekannt. Einteilige Kolben bestehen in der Regel aus einem Kolbenboden mit Ringnuten und einem Kolbenschaft mit Naben und Bolzenbohrungen. Gleichzeitig umfaßt der Kolbenschaft auch die den im Betrieb des Kolbens tragenden Schaftwandabschnitte (Führungsflächen). Pendelschaftkolben bestehen in der Regel aus einem Kolbenkopf mit angehängten Naben, wobei ein Pleuel und ein zusätzliches zylindrisches Bauteil, welches die tragenden Schaftwandabschnitte bildet, über einen Bolzen miteinander verbunden werden. Pistons for internal combustion engines in various designs (e.g. one-piece pistons or pendulum-shaft pistons) are known. One-piece pistons usually consist of a piston crown with ring grooves and a piston skirt with hubs and Bolt holes. At the same time, the piston skirt also includes those in the operation of the Piston-bearing skirt wall sections (guide surfaces). Articulated pistons usually consist of a piston head with attached hubs, with a connecting rod and an additional cylindrical component, which the load-bearing Shaft wall sections forms, are connected to each other via a bolt.
Solche Kolben sind in heutigen modernen Brennkraftmaschinen höchsten Belastungen, insbesondere bezüglich der Verbrennungstemperaturen und Verbrennungsdrücke, ausgesetzt. Gleichzeitig unterliegen sie Anforderungen wie höchster Stabilität bei geringstem Gewicht, was bei der Konstruktion eines Kolbens nur sehr schwer in Einklang zu bringen ist. Spart man Gewicht, führt dies zwangsläufig zu geringeren Materialstärken, wodurch wiederum die Festigkeit des Kolbens geschwächt wird. Such pistons are the highest in today's modern internal combustion engines Loads, particularly with regard to combustion temperatures and Combustion pressures exposed. At the same time, they are subject to requirements such as the highest Stability with the lowest weight, which is very difficult when designing a piston is to be reconciled. Saving weight inevitably leads to less Material thicknesses, which in turn weakens the strength of the piston.
Um einen Kolben widerstandsfähiger gegen sehr hohe Verbrennungsdrücke und Verbrennungstemperaturen zu machen, ist in der DE 199 00 121 A1 vorgeschlagen worden, einen Teilbereich des Kolbens, nämlich den Muldenrand, lokal umzuformen und dadurch zu einem gefeinten Gefüge mit hoher Duktilität zu kommen. Diese lokale Umformung findet also nur in einem Teilbereich des Kolbenbodens statt, und zwar in demjenigen Teilbereich, der in Richtung des Verbrennungsraumes der Brennkraftmaschine zeigt. To make a piston more resistant to very high combustion pressures and Making combustion temperatures is proposed in DE 199 00 121 A1 to locally reshape a portion of the piston, namely the bowl rim and thereby achieve a fine structure with high ductility. This local deformation therefore only takes place in a partial area of the piston crown, and in that part of the area in the direction of the combustion chamber Internal combustion engine shows.
Der Erfindung liegt die Aufgabe zugrunde, einen Kolben bereit zu stellen, der aufgrund hoher Anforderungen während des Betriebes diesen Belastungen standhält bei gleichzeitig niedrigem Gewicht des Kolbens. The invention has for its object to provide a piston that withstands these loads due to high demands during operation with low piston weight.
Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst. This object is solved by the features of claim 1.
Erfindungsgemäß ist vorgesehen, daß der Kolbenschaft zumindest in einem Teilbereich im wesentlichen im festen oder plastischen Zustand derart umgeformt wird, so daß keine oder nur die niedrig schmelzenden Phasen, die einen geringen Anteil des umzuformenden Werkstoffes darstellen, während der Umformung in den flüssigen Zustand übergehen und in dem Teilbereich sowohl ein Gußgefüge als auch ein Umformungsgefüge vorgefunden wird. Als bevorzugtes Verfahren zur Umformung wird das Reibrührschweißen angewendet, welches in der internationalen Patentanmeldung PCT/GB 92/02203 beschrieben ist. Durch die Behandlung (Umformung) von Teilbereichen des Kolbenschaftes, wobei bevorzugt die Naben des Kolbens derart behandelt werden, ist der Vorteil gegeben, daß auch dieser Bereich des Kolbens, der bisher auf diese Art und Weise nicht behandelt wurde, eine entsprechend hohe Duktilität aufweist bei vergleichsweise geringem Gewicht, so daß die beiden Anforderungen nach hoher Festigkeit während des Betriebes und geringem Gewicht in Einklang gebracht werden. Die Frage nach dem geringen Gewicht stellt sich bei dem Muldenrand des Kolbens nicht, da hier die Gewichtsanteile in Bezug auf das Gesamtgewicht des Kolbens vernachlässigbar gering sind. Anders sieht es bei den Naben aus, die einen wesentlichen Gewichtsanteil an dem Kolbenschaft und damit auch an den Gesamtgewicht des Kolbens haben. Besonders vorteilhaft hinsichtlich der Steigerung der Festigkeit ist es, wenn in das Umfangsgefüge zumindest ein Teil der Oberfläche der Bolzenaugen (Bolzenbohrungen) zu liegen kommt. According to the invention it is provided that the piston skirt at least in one Sub-area is essentially reshaped in the solid or plastic state, so that no or only the low melting phases, which account for a small proportion of the Represent material to be formed during the forming in the liquid Change state and in the sub-area both a cast structure and a Forming structure is found. The preferred method for forming is friction stir welding applied in the international Patent application PCT / GB 92/02203 is described. By treating (reshaping) Portions of the piston skirt, preferably the hubs of the piston treated, there is the advantage that this area of the piston, the So far it has not been treated in this way, a correspondingly high level Ductility is comparatively light, so the two Requirements for high strength during operation and low weight in harmony to be brought. The question of the low weight arises with the Not the bowl rim of the piston, since here the weight proportions in relation to the total weight of the piston are negligible. It looks different with the hubs that a significant proportion by weight in the piston skirt and thus also in the Have the total weight of the piston. Particularly advantageous with regard to the increase The strength is when at least part of the surface is in the peripheral structure the bolt eyes (bolt holes) come to rest.
Zur weiteren Erläuterung ist in der Figur ein beispielhafter Kolben 1 gezeigt, der im wesentlichen aus einem Kolbenboden 2 und einem Kolbenschaft 3 bestehen kann. Auf die Bauform (einteiliger Kolben oder mehrteiliger Kolben) sowie auf die geometrische Konstruktion des Kolbens 1 kommt es bei der Erfindung nicht an, die somit auf alle Bauformen von Kolben anwendbar ist. For further explanation, an exemplary piston 1 is shown in the figure, which can essentially consist of a piston crown 2 and a piston skirt 3 . The design (one-piece piston or multi-piece piston) and the geometric design of the piston 1 are not important in the invention, which is therefore applicable to all types of piston.
Mit einer Seite 4, die ggf. eine Brennraummulde aufweisen kann, ist der Kolben 1 in Richtung des Verbrennungsraumes der Brennkraftmaschine gerichtet. Weiterhin weist der Kolben 1 in an sich bekannter Weise Ringnuten 5 auf, wobei weiterhin im Bereich des Kolbenschaftes 3 die Naben 6 mit ihren Bolzenaugen 7 (Bolzenbohrungen) angeordnet sind. Insbesondere die Naben 6, ggf. auch geringe Bereiche, die in Richtung des Kolbenbodens 2 reichen, werden durch die Umformung, insbesondere das Reibrührschweißen, lokal umgeformt und dadurch ein gefeintes Gefüge mit hoher Duktilität erzielt. Besonders von Vorteil ist es, wenn die Umformung des Gefüges der Naben in einem festen Zustand erfolgt. Denn durch Zerbrechen der groben Gefügebestandteile im plastischen Werkstoffzustand, gefolgt von einem anschließenden Verpressen, ergibt sich ein feinkörniges Gefüge hoher Dichte, das sich durch eine vorteilhafte Verbesserung der Duktilität und durch das Fehlen innerer Kerben auszeichnet. Daher können diese Teilbereiche, insbesondere die Naben, des Kolbens 1 hinsichtlich ihres Gewichtes optimiert werden, ohne daß es im späteren Betrieb des Kolbens 1 zu Verformungen bis hin zum Dauerbruch der Naben 6 kommt. With a side 4, which may have a combustion chamber trough, the piston 1 is directed in the direction of the combustion chamber of the internal combustion engine. Furthermore, the piston 1 in known manner to the annular grooves 5, further wherein the hub 6 7 (bolt holes) are arranged in the region of the piston shaft 3 with their bolt eyes. In particular, the hubs 6 , possibly also small areas, which extend in the direction of the piston crown 2 , are locally deformed by the shaping, in particular the friction stir welding, and a refined structure with high ductility is thereby achieved. It is particularly advantageous if the structure of the hubs is reshaped in a solid state. Because breaking the coarse structural components in the plastic material state, followed by subsequent pressing, results in a fine-grained structure of high density, which is characterized by an advantageous improvement in ductility and the absence of internal notches. Therefore, these sub-areas, in particular the hubs, of the piston 1 can be optimized with regard to their weight without there being any deformations or even permanent breakage of the hubs 6 during the later operation of the piston 1 .
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10141189A DE10141189A1 (en) | 2001-08-22 | 2001-08-22 | Internal combustion engine piston shaft has shaft part remodeled by friction welding to form cast or conversion matrices specifically as piston boss. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10141189A DE10141189A1 (en) | 2001-08-22 | 2001-08-22 | Internal combustion engine piston shaft has shaft part remodeled by friction welding to form cast or conversion matrices specifically as piston boss. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10141189A1 true DE10141189A1 (en) | 2003-03-20 |
Family
ID=7696275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10141189A Ceased DE10141189A1 (en) | 2001-08-22 | 2001-08-22 | Internal combustion engine piston shaft has shaft part remodeled by friction welding to form cast or conversion matrices specifically as piston boss. |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10141189A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0153473A2 (en) * | 1984-02-11 | 1985-09-04 | Mahle Gmbh | Cast aluminium pistons for internal-combustion engines with a mechanically densified surface of the pin bores |
DE19900121A1 (en) * | 1999-01-05 | 2000-07-06 | Siegfried Mielke | Piston with locally deformed and refined high-ductility structure, with deformation taking place in solid or plastic state |
-
2001
- 2001-08-22 DE DE10141189A patent/DE10141189A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0153473A2 (en) * | 1984-02-11 | 1985-09-04 | Mahle Gmbh | Cast aluminium pistons for internal-combustion engines with a mechanically densified surface of the pin bores |
DE19900121A1 (en) * | 1999-01-05 | 2000-07-06 | Siegfried Mielke | Piston with locally deformed and refined high-ductility structure, with deformation taking place in solid or plastic state |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |