DE3803687A1 - BUILT CAMSHAFT - Google Patents

BUILT CAMSHAFT

Info

Publication number
DE3803687A1
DE3803687A1 DE3803687A DE3803687A DE3803687A1 DE 3803687 A1 DE3803687 A1 DE 3803687A1 DE 3803687 A DE3803687 A DE 3803687A DE 3803687 A DE3803687 A DE 3803687A DE 3803687 A1 DE3803687 A1 DE 3803687A1
Authority
DE
Germany
Prior art keywords
camshaft
elements
shaft tube
tubular shaft
built
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
DE3803687A
Other languages
German (de)
Other versions
DE3803687C2 (en
Inventor
Helmut Dipl Ing Swars
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.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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 Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Priority to DE3803687A priority Critical patent/DE3803687A1/en
Priority to GB8902326A priority patent/GB2215646B/en
Priority to ES8900358A priority patent/ES2012260A6/en
Priority to IT8905108A priority patent/IT1233030B/en
Priority to FR8901551A priority patent/FR2626951A1/en
Publication of DE3803687A1 publication Critical patent/DE3803687A1/en
Application granted granted Critical
Publication of DE3803687C2 publication Critical patent/DE3803687C2/de
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
    • C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
    • C23C8/68—Boronising
    • C23C8/70—Boronising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
    • C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
    • C23C8/48—Nitriding
    • C23C8/50—Nitriding of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements

Abstract

An assembled camshaft comprises a one-piece or assembled tubular shaft and elements in the form of cams or bearing shells held principally by friction under constant pre-tension as a result of radial hydraulic expansion of the tubular shaft. The tubular shaft is made of a material with a yield strength of approximately 300 N/mm<2> and a structure that is stable up to a temperature of at least 600 DEG C. The elements may be made of a hardenable casting material with a yield strength greater than or equal to 500 N/mm<2> and a minimum elongation of 1 to 2%. After joining the tubular shaft and the elements, the entire camshaft is thermochemically treated at a temperature of approximately 600 DEG C, e.g. bath-nitrided, soft nitrided, bonderized or treated with boron, giving improved wear resistance of the cam surface. The cams may be subjected to an induction or remelting hardening process before location on the tubular shaft.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von gebauten Nockenwellen mit einem einstückigen oder zusammen­ gesetzten Wellenrohr und darauf als Nocken oder Lagerstel­ len aufgeschobenen Elementen, die mittels radialer hydrau­ lischer Aufweitung des Wellenrohres überwiegend kraft­ schlüssig unter bleibender Vorspannung festgelegt sind. Weiter betrifft die Erfindung zur Anwendung dieses Verfah­ rens besonders geeignete Wellen.The invention relates to a method for producing built camshafts with one piece or together set shaft tube and on it as a cam or bearing len pushed-on elements, which by means of radial hydrau expansion of the shaft tube predominantly by force are conclusively determined under permanent preload. The invention further relates to the application of this method rens particularly suitable waves.

Die Entwicklung von gebauten Nockenwellen der genannten Art ist seit längerem in Gang, wobei bisher noch nicht alle Anforderungen erfüllt werden konnten, die an Serien­ erzeugnisse zu stellen sind. Bei der Verwendung von Stahl­ nocken lassen sich zwar einwandfrei verdrehfeste Verbin­ dungen zwischen Nocken und Welle aufgrund der elastischen Eigenschaften des Nockenmaterials herstellen, die Ver­ schleißfestigkeit ist jedoch bei hoher Belastung nicht immer zufriedenstellend.The development of built camshafts of the above Art has been going on for a long time, but not yet all requirements that could be met for series products are to be provided. When using steel cams can be perfectly twisted connection between cam and shaft due to the elastic Establish properties of the cam material, the Ver However, wear resistance is not at high loads always satisfactory.

Bei der Verwendung von Gußnocken bestehen Probleme mit der Nockenfestigkeit, wenn hohe Aufweitdrücke zur Erzielung der drehfesten Verbindung gefahren werden, auch hierbei ist eine Verbesserung der Verschleißfestigkeit noch er­ wünscht. There are problems with the use of cast cams Cam strength when achieving high expansion pressures of the non-rotatable connection, also here he is still improving wear resistance wishes.  

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren bereitzustellen, mit dem gebaute Nockenwellen hergestellt werden können, deren Verschleißfestigkeit an der Nockenlaufbahn gegenüber bisher bekannten Erzeugnissen erhöht ist. Die Lösung dafür liegt darin, daß für das Wellenrohr ein Werkstoff mit einer Streckgrenze von ca. 300 N/mm2 oder weniger und einem bis zu einer Temperatur von oberhalb 600°C stabilen Gefüge ausgewählt wird, die Elemente zunächst auf dem Wellenrohr festgelegt werden und die gesamte Nockenwelle einer thermochemischen Behandlung bei einer Temperatur von etwa 600°C ohne Verlust der elastischen Spannung in den Bauteilen an der Preßfläche unterzogen wird. Erfindungsgemäß wird durch eine besondere Werkstoffauswahl für den Werkstoff des Wellenrohres die Durchführung einer Oberflächenveredelung ermöglicht, die bisher bei gebauten Wellen der genannten Art nicht zur Anwendung kommen konnte, da die entsprechenden Verfahrens­ temperaturen zu einer Gefügeumwandlung im Wellenwerkstoff führten, der die Vorspannung der festgelegten Elemente verminderte und damit die drehfeste Verbindung auflöste. Eine Anwendung des thermochemischen Verfahrens, unter dem insbesondere Badnitrieren, Teniferbehandeln, Bondern und Borieren zu verstehen ist auf die Elemente vor dem Fest­ legen auf der Nockenwelle, ist andererseits deswegen nicht sinnvoll, weil blanke Sitzoberflächen zur besseren Fügung unbedingt erwünscht und notwendig sind, andernfalls wäre die Festigkeit der kraftschlüssigen Verbindung aufgrund unzulänglicher Oberflächen wesentlich herabgesetzt.The present invention has for its object to provide a method with which built camshafts can be produced, the wear resistance of the cam track is increased compared to previously known products. The solution to this is that a material with a yield strength of approx. 300 N / mm 2 or less and a structure that is stable up to a temperature of above 600 ° C. is selected for the corrugated tube, the elements are first fixed on the corrugated tube and the entire camshaft is subjected to a thermochemical treatment at a temperature of approximately 600 ° C. without loss of the elastic tension in the components on the pressing surface. According to the invention, a special material selection for the material of the shaft tube enables a surface refinement to be carried out which could not previously be used in built shafts of the type mentioned, since the corresponding process temperatures led to a structural transformation in the shaft material, which reduced the prestressing of the specified elements and thus dissolved the non-rotatable connection. An application of the thermochemical process, which in particular means bath nitriding, Tenifer treatment, bondering and boronizing is to be understood on the elements prior to fixing on the camshaft, on the other hand does not make sense because bare seat surfaces are absolutely desirable and necessary for better joining, otherwise it would be the strength of the positive connection is significantly reduced due to inadequate surfaces.

Eine besonders günstige Weiterbildung des Verfahrens be­ steht darin, die einzelnen Elemente in aneinanderliegender Form vor dem Verbinden mit dem Wellenrohr zu härten, ins­ besondere einem Induktivhärteverfahren oder einem Um­ schmelzhärteverfahren zu unterziehen. A particularly favorable development of the method be is the individual elements in a contiguous Harden the mold before connecting to the shaft tube especially an induction hardening process or a Um undergo melt hardening process.  

Wie oben bereits angedeutet, sind besonders günstige Er­ gebnisse in bezug auf die Verschleißfestigkeit mit Nocken­ wellen zu erzielen, die nach dem erfindungsgemäßen Verfah­ ren hergestellt werden und die Antriebselemente aus einem härtbaren Gußwerkstoff mit einer Streckgrenze von =500 N/mm2 und einer Mindestdehnung von 1 bis 2% aufweisen. Es kann sich hierbei bevorzugt um induktiv gehärtete Ele­ mente aus schwarzem Temperguß mit martensitischem Gefüge oder um Elemente aus durch Umschmelzen gehärteten Temper­ guß mit ledeburitischem Gefüge handeln.As already indicated above, particularly favorable results in terms of wear resistance can be achieved with cam shafts which are produced by the method according to the invention and the drive elements are made of a hardenable cast material with a yield strength of = 500 N / mm 2 and a minimum elongation of Have 1 to 2%. It can preferably be inductively hardened elements made of black malleable cast iron with a martensitic structure or elements made of remelted tempered cast iron with a leather-buried structure.

Claims (11)

1. Verfahren zur Herstellung einer gebauten Nockenwelle mit einem einstückigen oder zusammengesetzten Wellen­ rohr und darauf als Nocken oder Lagerstellen aufge­ schobenen Elementen, die mittels radialer hydrau­ lischer Aufweitung des Wellenrohres überwiegend kraft­ schlüssig unter bleibender Vorspannung festgelegt sind, dadurch gekennzeichnet, daß
  • 1. für das Wellenrohr ein Werkstoff mit einer Streck­ grenze von ca. 300 N/mm2 und einem bis zu einer Temperatur von oberhalb 600°C stabilen Gefüge ausgewählt wird,
  • 2. die Elemente zunächst auf dem Wellenrohr festge­ legt werden und
  • 3. die gesamte Nockenwelle einer thermochemischen Behandlung bei einer Temperatur von etwa 600°C unterzogen wird.
1. A method for producing a built-up camshaft with a one-piece or composite shaft tube and then pushed up as cams or bearing elements, which are determined by radial hydrau lic expansion of the shaft tube mainly forcefully under permanent bias, characterized in that
  • 1. a material with a yield point of approximately 300 N / mm 2 and a structure that is stable up to a temperature of above 600 ° C. is selected for the shaft tube,
  • 2. the elements are first laid on the shaft tube and
  • 3. the entire camshaft is subjected to a thermochemical treatment at a temperature of about 600 ° C.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Elemente vor dem Festlegen auf dem Wellenrohr insbesondere zu mehreren nebeneinanderliegend einem Härteverfahren unterzogen werden.2. The method according to claim 1, characterized,  that the elements before fixing on the shaft tube in particular to several juxtaposed one Be subjected to hardening processes. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Elemente nach dem Umschmelzhärteverfahren gehärtet werden.3. The method according to claim 2, characterized, that the elements after the remelting process be hardened. 4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Elemente einem Induktivhärteverfahren unter­ zogen werden.4. The method according to claim 2, characterized, that the elements under an induction hardening process be drawn. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die gesamte Nockenwelle badnitriert wird.5. The method according to any one of claims 1 to 4, characterized, that the entire camshaft is bath nitrided. 6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Nockenwelle teniferbehandelt wird.6. The method according to any one of claims 1 to 4, characterized, that the camshaft is treated with tenifers. 7. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die gesamte Nockenwelle gebondert wird. 7. The method according to any one of claims 1 to 4, characterized, that the entire camshaft is segregated.   8. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die gesamte Nockenwelle boriert wird.8. The method according to any one of claims 1 to 4, characterized, that the entire camshaft is borated. 9. Gebaute Nockenwelle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Antriebselemente aus einem härtbaren Gußwerk­ stoff mit einer Streckgrenze von 500 N/mm2 unter einer Mindestdehnung von 1 bis 2% bestehen.9. Built camshaft according to one of the preceding claims, characterized in that the drive elements consist of a hardenable cast material with a yield strength of 500 N / mm 2 under a minimum elongation of 1 to 2%. 10. Gebaute Nockenwelle nach Anspruch 9, dadurch gekennzeichnet, daß die Antriebselemente aus induktivgehärtetem schwar­ zem Temperguß mit martensitischen Gefüge bestehen.10. Built camshaft according to claim 9, characterized, that the drive elements made of induction hardened black zem malleable iron with martensitic structure. 11. Gebaute Nockenwelle nach Anspruch 9, dadurch gekennzeichnet, daß die Antriebselemente aus durch Umschmelzhärten gehärtetem Temperguß mit ledeburitischem Gefüge beste­ hen.11. Built camshaft according to claim 9, characterized, that the drive elements from by remelting hardened malleable cast iron with a leather-burit structure hen.
DE3803687A 1988-02-07 1988-02-07 BUILT CAMSHAFT Granted DE3803687A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE3803687A DE3803687A1 (en) 1988-02-07 1988-02-07 BUILT CAMSHAFT
GB8902326A GB2215646B (en) 1988-02-07 1989-02-02 Assembled camshaft
ES8900358A ES2012260A6 (en) 1988-02-07 1989-02-02 Assembled camshaft
IT8905108A IT1233030B (en) 1988-02-07 1989-02-03 COMPOSITE CAMSHAFT AND MANUFACTURING PROCEDURE.
FR8901551A FR2626951A1 (en) 1988-02-07 1989-02-07 COMPOUND CAMSHAFT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3803687A DE3803687A1 (en) 1988-02-07 1988-02-07 BUILT CAMSHAFT

Publications (2)

Publication Number Publication Date
DE3803687A1 true DE3803687A1 (en) 1989-08-17
DE3803687C2 DE3803687C2 (en) 1992-02-06

Family

ID=6346850

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3803687A Granted DE3803687A1 (en) 1988-02-07 1988-02-07 BUILT CAMSHAFT

Country Status (5)

Country Link
DE (1) DE3803687A1 (en)
ES (1) ES2012260A6 (en)
FR (1) FR2626951A1 (en)
GB (1) GB2215646B (en)
IT (1) IT1233030B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19625554C2 (en) * 1996-06-26 1999-07-29 Hans Dipl Ing Kuehl Method and device for the rotationally fixed connection of a shaft with at least one part arranged on the shaft
DE19625555C2 (en) * 1996-06-26 1999-08-05 Hans Dipl Ing Kuehl Method and device for the rotationally fixed connection of a hollow shaft with at least one part arranged on the shaft
DE19937938A1 (en) * 1999-08-11 2001-03-29 Daimler Chrysler Ag Worked camshaft; has cam made of steel material with ledeburite joint in edge zone of its running surface
DE102005061980A1 (en) * 2005-12-23 2007-07-05 Audi Ag Production of camshaft for actuating valves of internal combustion engine comprises finishing cam support in unhardened state and locally hardening the cam running surfaces
DE102005061979A1 (en) * 2005-12-23 2007-07-05 Audi Ag Production of camshafts made up of tubular shaft and adjusting knob comprises fastening shaft to knob, shaft then being hardened
WO2010142266A1 (en) 2009-06-10 2010-12-16 Neumayer Tekfor Holding Gmbh Method for producing a camshaft and corresponding camshaft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3943262A1 (en) * 1989-12-29 1991-07-11 Balcke Duerr Ag METHOD FOR INCREASING LIABILITY BETWEEN A HOLLOW SHAFT AND ITS FASTENED PARTS
DE4205801C1 (en) * 1992-02-26 1993-07-15 Aeg-Elotherm Gmbh, 5630 Remscheid, De

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546802C3 (en) * 1975-10-18 1979-08-09 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln Cam wager for reciprocating engines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445623C3 (en) * 1974-09-25 1979-05-03 Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover Process for the production of workpieces from steel that are subject to thermal stress
US4597365A (en) * 1985-02-07 1986-07-01 General Motors Corporation Camshaft assembly and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546802C3 (en) * 1975-10-18 1979-08-09 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln Cam wager for reciprocating engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
N.N.: Durferrit-Handbuch, 10.Aufl.1977, Fa.Degussa, Hanau-Wolfgang, S.69-79,142-145 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19625554C2 (en) * 1996-06-26 1999-07-29 Hans Dipl Ing Kuehl Method and device for the rotationally fixed connection of a shaft with at least one part arranged on the shaft
DE19625555C2 (en) * 1996-06-26 1999-08-05 Hans Dipl Ing Kuehl Method and device for the rotationally fixed connection of a hollow shaft with at least one part arranged on the shaft
DE19937938A1 (en) * 1999-08-11 2001-03-29 Daimler Chrysler Ag Worked camshaft; has cam made of steel material with ledeburite joint in edge zone of its running surface
DE102005061980A1 (en) * 2005-12-23 2007-07-05 Audi Ag Production of camshaft for actuating valves of internal combustion engine comprises finishing cam support in unhardened state and locally hardening the cam running surfaces
DE102005061979A1 (en) * 2005-12-23 2007-07-05 Audi Ag Production of camshafts made up of tubular shaft and adjusting knob comprises fastening shaft to knob, shaft then being hardened
DE102005061979B4 (en) * 2005-12-23 2009-11-05 Audi Ag Method for producing a camshaft
DE102005061980B4 (en) * 2005-12-23 2010-02-18 Audi Ag Method for producing a camshaft and camshaft
WO2010142266A1 (en) 2009-06-10 2010-12-16 Neumayer Tekfor Holding Gmbh Method for producing a camshaft and corresponding camshaft
DE102009025023A1 (en) 2009-06-10 2010-12-16 Neumayer Tekfor Holding Gmbh Method for producing a camshaft and corresponding camshaft
US8474136B2 (en) 2009-06-10 2013-07-02 Neumayer Tekfor Holding Gmbh Method for the fabrication of a camshaft and a corresponding camshaft

Also Published As

Publication number Publication date
GB2215646B (en) 1992-03-18
GB8902326D0 (en) 1989-03-22
IT8905108A0 (en) 1989-02-03
GB2215646A (en) 1989-09-27
ES2012260A6 (en) 1990-03-01
DE3803687C2 (en) 1992-02-06
IT1233030B (en) 1992-03-14
FR2626951B1 (en) 1995-04-07
FR2626951A1 (en) 1989-08-11

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