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GB2215646A - Assembled camshaft - Google Patents

Assembled camshaft Download PDF

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Publication number
GB2215646A
GB2215646A GB8902326A GB8902326A GB2215646A GB 2215646 A GB2215646 A GB 2215646A GB 8902326 A GB8902326 A GB 8902326A GB 8902326 A GB8902326 A GB 8902326A GB 2215646 A GB2215646 A GB 2215646A
Authority
GB
United Kingdom
Prior art keywords
camshaft
process according
elements
tubular shaft
hardened
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
GB8902326A
Other versions
GB2215646B (en
GB8902326D0 (en
Inventor
Helmut 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
Publication of GB8902326D0 publication Critical patent/GB8902326D0/en
Publication of GB2215646A publication Critical patent/GB2215646A/en
Application granted granted Critical
Publication of GB2215646B publication Critical patent/GB2215646B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Heat Treatment Of Articles (AREA)

Description

ASSEMBLED CAMSHAFT This invention relates to a process for producing an
assembled camshaft comprising a one-piece or assembled tubular shaft and elements in the form of cams or bearing shells held on the shaft principally by friction locking as a result of radial hydraulic expansion of the tubular shaft. The invention also relates to camshafts made by this process.
Assembled camshafts of the type described above have been undergoing development for a considerable time, but the full range of demands made of volume-produced products has not yet been satisfied. The elastic properties of steel cams can be exploited to obtain a perfectly torsion-proof connection between cam and shaft, but wear resistance is not always satisfactory at high loads.
In the case of cast cams, strength problems arise in conjunction with the high expansion pressures used to obtain a torsion-proof connection. Here again, enhanced wear resistance would also be desirable.
The present invention has the object of providing a process for producing assembled camshafts with improved wear resistance at the cam surface compared with currently available products.
The invention provides a process for producing an assembled camshaft comprising a one-piece or assembled tubular shaft and elements in the form of cams or bearing shells held principally by friction locking as a result 2 of radial hydraulic expansion of the tubular shaft, wherein the tubular shaft material has a yield strength of approximately 300 N/MM2 and a structure that is stable up to a temperature of 6000C, the elements are initially fixed on the tubular shaft by hydraulic expansion, and the entire camshaft is thermochemically treated at a temperature of approximately 6000C.
In a process according to the last preceding paragraph, the tubular shaft material is chosen with a yield strength of approximately or substantially 300 N/IM2 or below and a structure that is stable up to a temperature of at least 6000C or above, e.g. a heat-resistant steel such as 10 Cr Mo 9 10 steel, and the elements are initially fixed on the tubular shaft by hydraulic expansion and the entire camshaft is subjected to thermochemical treatment at a temperature of approximately or substantially 6000C without loss of component elasticity at the contact surfaces. In accordance with the invention, the tubular shaft material, e.g. a heat-resistant steel such as 10 Cr.Mo 9 10 steel, is selected specifically to permit surface treatment such as not previously used on constructed shafts of this type because the required process temperatures tended to reduce the pre-tension of the fixed elements and thus release the torsion-proof connection. On the other hand, thermochemical treatment (bath nitriding, soft nitriding, bonderizing and treating with boron in particular) of the elements before fixing on the camshaft is not desirable because bright seat surfaces are essential to provide a better join and prevent significant loss of strength in the friction-locking connection caused by unsuitable surfaces.
3 In an especially favourable further development of the process the adjacently arranged individual elements are subjected to a hardening process before location on the tubular shaft, in particular by subjecting them to an induction or remelting hardening process.
The invention also provides a camshaft made according to a process in accordance with the invention, wherein the drive elements are made from a hardenable casting material with a yield strength greater than or equal to 500 N/MM2 and a minimum elongation of 1 to 2%.
This gives especially favourable wear properties. Such elements will preferably be induction-hardened black heart castings with a martensitic structure or malleable iron castings hardened by remelting with a ledeburitic structure.
4

Claims (11)

  1. A process for producing an assembled camshaft comprising a one-piece or assembled tubular shaft and elements in the form of cams or bearing shells held principally by friction locking as a result of radial hydraulic expansion of the tubular shaft, wherein the tubular shaft material has a yield strength of approximately 300 N/mM2 and a structure that is stable up to a temperature of 6000C, the elements are initially fixed on the tubular shaft by hydraulic expansion, and the entire camshaft is thermochemically treated at a temperature of approximately 6000C.
  2. 2. A process according to Claim 1,Yherein the adjacently arranged individual elements are subjected to a hardening process before location on the tubular shaft.
  3. 3. A process according to Claim 2, wherein the elements are hardened in a remelting hardening process.
  4. 4. A process according to Claim 2, wherein the elements are subjected to an induction hardening process.
  5. 5. A process according to any one of Claims I to 4, wherein the entire camshaft is bath-nitrided.
  6. 6. A process according to any one of Claims 1 to 4, wherein the camshaft Is soft-nitrided.
  7. 7. A process according to any one of Claims 1 to 4, wherein the entire camshaft is bonderized.
  8. 8. A process according to any one of Claims 1 to 4, wherein the entire camshaft is treated with boron.
  9. 9 9. A camshaft made according to a process according to any one of the preceding claims, wherein the drive elements are made from a hardenable casting material with a yield strength greater than or equal to 500 N/1=2 and a minimum elongation of 1 to 2%.
  10. 10. A camshaft according to Claim 9, wherein the drive elements comprise induction-hardened black heart castings with a martensitic structure.
  11. 11. A camshaft according to Claim 9, wherein the drive elements comprise malleable iron castings hardened by remelting with a ledeburitic structure.
    Publiabed 1989 at The Patent OMoe, State House, 88/71 High Holborn, London WCIR 4TP. Further copies maybe obtained ftm The Patent Offt". IWOB Branch, St Mary Cray, Orpington, Kent BRS MLD. Printed by Multiplex techniques ltd, St Mary Cray, Kent COIL 1187
GB8902326A 1988-02-07 1989-02-02 Assembled camshaft Expired - Lifetime GB2215646B (en)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
GB8902326D0 GB8902326D0 (en) 1989-03-22
GB2215646A true GB2215646A (en) 1989-09-27
GB2215646B GB2215646B (en) 1992-03-18

Family

ID=6346850

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8902326A Expired - Lifetime GB2215646B (en) 1988-02-07 1989-02-02 Assembled 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8474136B2 (en) 2009-06-10 2013-07-02 Neumayer Tekfor Holding Gmbh Method for the fabrication of a camshaft and a corresponding camshaft

Families Citing this family (7)

* 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
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
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
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
DE102005061980B4 (en) * 2005-12-23 2010-02-18 Audi Ag Method for producing a camshaft and camshaft
DE102005061979B4 (en) * 2005-12-23 2009-11-05 Audi Ag Method for producing a camshaft

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190841A2 (en) * 1985-02-07 1986-08-13 General Motors Corporation Camshaft assembly and method of manufacture

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
DE2546802C3 (en) * 1975-10-18 1979-08-09 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln Cam wager for reciprocating engines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190841A2 (en) * 1985-02-07 1986-08-13 General Motors Corporation Camshaft assembly and method of manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
ES2012260A6 (en) 1990-03-01
DE3803687C2 (en) 1992-02-06
IT8905108A0 (en) 1989-02-03
GB2215646B (en) 1992-03-18
GB8902326D0 (en) 1989-03-22
FR2626951B1 (en) 1995-04-07
DE3803687A1 (en) 1989-08-17
FR2626951A1 (en) 1989-08-11
IT1233030B (en) 1992-03-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020202