EP1161624A1 - Multi-piece piston - Google Patents

Multi-piece piston

Info

Publication number
EP1161624A1
EP1161624A1 EP00907440A EP00907440A EP1161624A1 EP 1161624 A1 EP1161624 A1 EP 1161624A1 EP 00907440 A EP00907440 A EP 00907440A EP 00907440 A EP00907440 A EP 00907440A EP 1161624 A1 EP1161624 A1 EP 1161624A1
Authority
EP
European Patent Office
Prior art keywords
piston
built
steel
piston according
built piston
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.)
Granted
Application number
EP00907440A
Other languages
German (de)
French (fr)
Other versions
EP1161624B1 (en
Inventor
Jochen Kortas
Stefan Lipp
Wilfried Sander
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 GmbH
Original Assignee
Mahle 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7900418&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1161624(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1161624A1 publication Critical patent/EP1161624A1/en
Application granted granted Critical
Publication of EP1161624B1 publication Critical patent/EP1161624B1/en
Anticipated expiration legal-status Critical
Revoked 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 
    • 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
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to built pistons according to the preamble of claim 1. Such pistons are known in practice.
  • the known pistons usually have lower parts made of pressed aluminum or cast iron. It has been shown that the known lower parts increasingly come up against limits in terms of strength and that, in particular in the case of lower parts made of cast iron, these limits are due to casting errors which can be ruled out, in spite of increased testing effort.
  • the invention is therefore concerned with the problem of providing a lower part for the generic piston which satisfies the increased strength requirements.
  • the forging-technical production of the lower part in connection with the material AFP steel provides an economically producible lower part with high strength.
  • AFP steel Since the structure of the AFP steel is adjusted by appropriate heat management during the forging process, there are lower parts for large components with the appropriate wall thickness Built pistons with a diameter of 250 mm or more may be considered as such - the risk that the desired structure will not occur over the entire cross-section and the strength will be correspondingly lower than expected.
  • Titanium can be added to the AFP steel as a means of adjusting the desired structure - in particular with regard to the grain size.
  • the 38MnVS6 steel has proven to be an inexpensive AFP steel.
  • bushings in the hub area can be dispensed with if the piston pin and / or the pin hubs are coated.
  • phosphating is thought of.
  • the lower part material according to the invention also makes it possible to increase the surface pressures in the bolt area.
  • the lower length of the piston built is advantageously reduced to less than 40% of the piston diameter, since this saves weight and avoids problems with forging technology. Due to the higher modulus of elasticity of steel compared to gray cast iron and aluminum, an equivalent straight guidance is nevertheless achieved.
  • One or more recesses for receiving cooling oil are machined in the bottom part of the base.
  • the diameter range for lower parts according to the invention starts at approximately 160 mm. Due to the increased material strength, the wall thicknesses can be locally smaller compared to cast lower parts. However, the tightening bevels required for forging sometimes also result in higher wall thicknesses.
  • the invention is explained in more detail below on the basis of an exemplary embodiment. It shows:
  • Fig. 1 shows a piston built according to the invention in cross section in the DR-GDR direction.
  • a built piston 1 consists of an upper part 2 made of forged steel, which is connected to a lower part 3 made of forged AFP steel with a centrally arranged screw 4.
  • the lower part is made without a socket.
  • the lower length of the lower part is less than 40% of the piston diameter.

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)
  • Clamps And Clips (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a multi-piece piston, comprising a steel upper part and a lower part which is screwed to said upper part and which contains the hubs. The aim of the invention is to improve the strength of the lower part and its resistance to material defects and to reduce production costs. To this end, the lower part consists of a precipitation-hardened ferrite-perlite steel, preferably according to DIN EN 10267 and with added titanium and the hubs of the lower part are preferably not reinforced with bushings.

Description

Gebauter Kolben Built piston
Die Erfindung betrifft gebaute Kolben nach dem Oberbegriff des Patentanspruchs 1. Derartige Kolben sind aus der Praxis bekannt .The invention relates to built pistons according to the preamble of claim 1. Such pistons are known in practice.
Die bekannten Kolben weisen meist Unterteile aus gepreßtem Aluminium oder aus Gußeisen auf. Es hat sich gezeigt, daß die bekannten Unterteile festigkeitsmäßig zunehmend an Grenzen stoßen und daß insbesondere bei Unterteilen aus Gußeisen diese Grenzen durch - trotz erhöhten Prüfaufwands - kaum auszuschließende Gießfehler gegeben sind.The known pistons usually have lower parts made of pressed aluminum or cast iron. It has been shown that the known lower parts increasingly come up against limits in terms of strength and that, in particular in the case of lower parts made of cast iron, these limits are due to casting errors which can be ruled out, in spite of increased testing effort.
Die Erfindung beschäftigt sich daher mit dem Problem, firrr gattungsgemäße Kolben ein Unterteil bereitzustellen, das den erhöhten Festigkeitsanforderungen genügt.The invention is therefore concerned with the problem of providing a lower part for the generic piston which satisfies the increased strength requirements.
Eine Lösung dieses Problems wird bei gattungsgemäßen Kolben durch den kennzeichnenden Teil des Anspruchs 1 angegeben. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.A solution to this problem is given in generic pistons by the characterizing part of claim 1. Advantageous further developments are the subject of the subclaims.
Durch die schmiedetechnische Herstellung des Unterteils in Verbindung mit dem Werkstoff AFP-Stahl wird ein wirtschaftlich herstellbares Unterteil mit hoher Festigkeit bereitgestellt.The forging-technical production of the lower part in connection with the material AFP steel provides an economically producible lower part with high strength.
Da das Gefüge des AFP-Stahls durch entsprechende Wärmeführung beim Schmiedeprozeß eingestellt wird, besteht bei großen Bauteilen mit entsprechender Wandstärke - Unterteile gebauter Kolben ab 250 mm Durchmesser dürfen als solche gelten - die Gefahr, daß sich nicht über den gesamten Querschnitt das gewünschte Gefüge einstellt und die Festigkeit entsprechend niedriger als erwartet ausfällt.Since the structure of the AFP steel is adjusted by appropriate heat management during the forging process, there are lower parts for large components with the appropriate wall thickness Built pistons with a diameter of 250 mm or more may be considered as such - the risk that the desired structure will not occur over the entire cross-section and the strength will be correspondingly lower than expected.
Als Mittel zur Einstellung des gewünschten Gefüges - insbesondere hinsichtlich der Korngröße - kann gemäß Anspruch 3 dem AFP-Stahl Titan zugesetzt werden. Als günstiger AFP- Stahl hat sich der Stahl 38MnVS6 erwiesen.Titanium can be added to the AFP steel as a means of adjusting the desired structure - in particular with regard to the grain size. The 38MnVS6 steel has proven to be an inexpensive AFP steel.
Gemäß Anspruch 4 kann auf die Verwendung von Buchsen im Nabenbereich verzichtet werden, wenn der Kolbenbolzen und/oder die Bolzennaben beschichtet sind. Dabei ist insbesondere an Phosphatieren gedacht .According to claim 4, the use of bushings in the hub area can be dispensed with if the piston pin and / or the pin hubs are coated. In particular, phosphating is thought of.
Durch den erfindungsgemäßen Unterteil-Werkstoff ist es außerdem möglich, die Flächenpressungen im Bolzenbereich zu erhöhen.The lower part material according to the invention also makes it possible to increase the surface pressures in the bolt area.
Vorteilhaft wird die untere Länge des gebauten Kolben auf weniger als 40 % des Kolbendurchmessers zurückgenommen, da hierdurch Gewicht eingespart wird und schmiedetechnische Probleme vermieden werden. Durch den höheren E-Modul von Stahl im Vergleich zu Grauguß und Aluminium wird dennoch eine gleichwertige Geradführung erreicht.The lower length of the piston built is advantageously reduced to less than 40% of the piston diameter, since this saves weight and avoids problems with forging technology. Due to the higher modulus of elasticity of steel compared to gray cast iron and aluminum, an equivalent straight guidance is nevertheless achieved.
Im Unterteilboden werden spanend eine oder mehrere Ausnehmungen zur Aufnahme von Kühlöl eingebracht.One or more recesses for receiving cooling oil are machined in the bottom part of the base.
Der Durchmesserbereich für erfindungsgemäße Unterteile beginnt bei ca. 160 mm. Bedingt durch die erhöhte Werkstofffestigkeit können lokal - verglichen mit gegossenen Unterteilen - die Wandstärken geringer sein. Allerdings werden durch die zum Schmieden notwendigen Anzugsschrägen teilweise auch höhere Wandstärken erreicht . Die Erfindung wird im folgenden anhand eines Ausführungs- beispiels näher erläutert. Es zeigt:The diameter range for lower parts according to the invention starts at approximately 160 mm. Due to the increased material strength, the wall thicknesses can be locally smaller compared to cast lower parts. However, the tightening bevels required for forging sometimes also result in higher wall thicknesses. The invention is explained in more detail below on the basis of an exemplary embodiment. It shows:
Fig. 1 einen erfindungsgemäßen gebauten Kolben im Querschnitt in DR-GDR-Richtung .Fig. 1 shows a piston built according to the invention in cross section in the DR-GDR direction.
Ein gebauter Kolben 1 besteht aus einem Oberteil 2 aus geschmiedetem Stahl, das mit einem Unterteil 3 aus geschmiedetem AFP-Stahl mit einer zentral angeordneten Schraube 4 verbunden ist. Das Unterteil ist buchsenlos ausgeführt.A built piston 1 consists of an upper part 2 made of forged steel, which is connected to a lower part 3 made of forged AFP steel with a centrally arranged screw 4. The lower part is made without a socket.
Die untere Länge des Unterteils beträgt weniger als 40 % des Kolbendurchmessers .The lower length of the lower part is less than 40% of the piston diameter.
Da Oberteil 2 und Unterteil 3 gleichsinnig schraffiert sind, wurde die Trennfuge zwischen beiden durch eine stärkere Strichstärke hervorgehoben. Since the upper part 2 and lower part 3 are hatched in the same direction, the parting line between the two was emphasized by a thicker line.

Claims

Patentansprüche claims
1. Gebauter Kolben mit einem Oberteil (2) aus Stahl und einem mit dem Oberteil verschraubten Unterteil (3), das die Naben beinhaltet, dadurch gekennzeichnet, daß das Unterteil (3) aus fließgepreßtem oder geschmiedetem, ausscheidungshärtendem ferritisch perlitischem Stahl (AFP-Stahl) besteht.1. Built piston with an upper part (2) made of steel and a screwed to the upper part of the lower part (3), which contains the hubs, characterized in that the lower part (3) made of extruded or forged, precipitation-hardening ferritic pearlitic steel (AFP steel ) consists.
2. Gebauter Kolben nach Anspruch 1, dadurch gekennzeichnet, daß der Werkstoff des Unterteils (3) ein AFP-Stahl nach Stahl-Eisen-Werkstoffblatt DIN EN 10267 ist.2. Built piston according to claim 1, characterized in that the material of the lower part (3) is an AFP steel according to the steel-iron material sheet DIN EN 10267.
3. Gebauter Kolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der AFP-Stahl zusätzlich einen Titan-Anteil von 0,01-0,05 Gew.-% aufweist.3. Built piston according to claim 1 or 2, characterized in that the AFP steel additionally has a titanium content of 0.01-0.05 wt .-%.
4. Gebauter Kolben nach Anspruch 1 - 3, dadurch gekennzeichnet, daß die Naben des Kolbens (1) nicht mit Buchsen bewehrt sind und daß der Bolzen und/oder die Nabenbohrungen des Kolbens (1) beschichtet sind.4. Built piston according to claim 1-3, characterized in that the hubs of the piston (1) are not reinforced with bushings and that the bolt and / or the hub bores of the piston (1) are coated.
5. Gebauter Kolben nach Anspruch 4 , dadurch gekennzeichnet, daß die Nabenbohrungen und/oder der Bolzen des Kolbens (1) phosphatiert sind. 5. Built piston according to claim 4, characterized in that the hub bores and / or the bolt of the piston (1) are phosphated.
6. Gebauter Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die maximal auftretende Flächenpressung in der Nabe6. Built piston according to one of the preceding claims, characterized in that the maximum surface pressure occurring in the hub
> 85 N/mm ist.> 85 N / mm.
7. Gebauter Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die untere Länge, d. h. die in Axialrichtung des Kolbens (1) gemessene Distanz zwischen Mitte der Bolzenachse bis zum Schaftende < 40 % des Kolbendurchmessers ist.7. Built piston according to one of the preceding claims, characterized in that the lower length, d. H. the distance measured in the axial direction of the piston (1) between the center of the pin axis and the shaft end is <40% of the piston diameter.
8. Gebauter Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Unterteil lokal (3) variierende Anzugsschrägen aufweist .8. Built piston according to one of the preceding claims, characterized in that the lower part locally (3) has varying bevels.
. Gebauter Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Unterteil (3) in dem dem Oberteil (2) benachbarten Bereich eine oder mehrere Ausnehmungen zur Aufnahme von Kühlöl aufweist, die durch spanende Bearbeitung hergestellt sind. . Built piston according to one of the preceding claims, characterized in that the lower part (3) in the area adjacent to the upper part (2) has one or more recesses for receiving cooling oil, which are produced by machining.
EP00907440A 1999-03-10 2000-01-25 Multi-piece piston Revoked EP1161624B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19910582A DE19910582A1 (en) 1999-03-10 1999-03-10 Built piston
DE19910582 1999-03-10
PCT/DE2000/000199 WO2000053913A1 (en) 1999-03-10 2000-01-25 Multi-piece piston

Publications (2)

Publication Number Publication Date
EP1161624A1 true EP1161624A1 (en) 2001-12-12
EP1161624B1 EP1161624B1 (en) 2003-05-28

Family

ID=7900418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00907440A Revoked EP1161624B1 (en) 1999-03-10 2000-01-25 Multi-piece piston

Country Status (7)

Country Link
US (1) US6622613B1 (en)
EP (1) EP1161624B1 (en)
JP (1) JP2002539356A (en)
KR (1) KR100573465B1 (en)
BR (1) BR0008833B1 (en)
DE (4) DE19910582A1 (en)
WO (1) WO2000053913A1 (en)

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Publication number Priority date Publication date Assignee Title
DE10022035A1 (en) 2000-05-05 2001-11-08 Mahle Gmbh Internal combustion engine with built piston; has piston with base and lower part connected by screw having device in head to transfer oil from connecting rod to cooling chamber in piston
GB2366607B (en) * 2000-09-06 2004-06-09 Federal Mogul Bradford Ltd Piston for internal combustion engine
WO2002033291A1 (en) 2000-10-18 2002-04-25 Federal-Mogul Corporation Multi-axially forged piston
DE10210570A1 (en) * 2002-03-09 2003-09-18 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
DE10244513A1 (en) * 2002-09-25 2004-04-08 Mahle Gmbh Multi-part cooled piston for an internal combustion engine and method for its production
DE10244511A1 (en) * 2002-09-25 2004-04-15 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
DE10257022A1 (en) * 2002-12-06 2004-06-17 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
EP1612395A4 (en) * 2003-03-31 2010-08-04 Hitachi Metals Ltd Piston for internal combustion engine
US20040261752A1 (en) * 2003-06-26 2004-12-30 Wolfgang Rein Phosphatized and bushingless piston and connecting rod assembly having an internal gallery and profiled piston pin
DE102004027974A1 (en) * 2004-06-08 2005-12-29 Mahle Gmbh A built piston and method of preventing damage in contact surfaces of the top and bottom of the piston
DE102004029877A1 (en) * 2004-06-19 2006-01-05 Mahle Gmbh Built piston for an internal combustion engine
EP1960653B1 (en) * 2005-12-17 2010-12-01 Mahle International GmbH Two-piece piston for an internal combustion engine
DE102005061899A1 (en) * 2005-12-23 2007-06-28 Mahle International Gmbh Multipart piston for an internal combustion engine has upper and lower piston parts, a threaded head, a support plate with a plate body and a threaded body
DE102007021101A1 (en) 2007-05-03 2008-11-06 Mahle International Gmbh Alloy steel and its use
DE102007060472A1 (en) 2007-12-14 2009-06-18 Mahle International Gmbh Two-piece piston for an internal combustion engine
JP5615300B2 (en) 2009-02-27 2014-10-29 フェデラル−モーグル コーポレイション Piston with central oil flow and piston pin lubrication supply, and method of construction
DE102010053925A1 (en) 2010-12-09 2012-06-14 Mahle International Gmbh Piston for an internal combustion engine and method for its production
DE102011013143A1 (en) 2011-03-04 2012-09-06 Mahle International Gmbh Piston for an internal combustion engine and method for its production
CN107100754B (en) * 2011-03-07 2019-04-16 康明斯知识产权公司 For enhancing cooling engine device
US9291119B2 (en) * 2013-03-14 2016-03-22 Mahle International Gmbh Piston assembly with preloaded support surfaces

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DE2919638A1 (en) * 1979-05-16 1980-11-20 Schmidt Gmbh Karl PISTON FOR INTERNAL COMBUSTION ENGINES
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BR9001859A (en) * 1990-04-17 1991-11-12 Metal Leve Sa EMBOLO AND EMBOLO MANUFACTURING PROCESS
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Also Published As

Publication number Publication date
US6622613B1 (en) 2003-09-23
DE50002358D1 (en) 2003-07-03
KR20020004961A (en) 2002-01-16
DE20007415U1 (en) 2000-09-28
WO2000053913A1 (en) 2000-09-14
BR0008833A (en) 2001-12-18
DE19910582A1 (en) 2000-09-28
JP2002539356A (en) 2002-11-19
BR0008833B1 (en) 2009-01-13
EP1161624B1 (en) 2003-05-28
KR100573465B1 (en) 2006-04-24
DE10080565D2 (en) 2002-03-07

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