EP1611316B1 - Arbre a cames dont les cames sont engagees par pression - Google Patents

Arbre a cames dont les cames sont engagees par pression Download PDF

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Publication number
EP1611316B1
EP1611316B1 EP04702270.2A EP04702270A EP1611316B1 EP 1611316 B1 EP1611316 B1 EP 1611316B1 EP 04702270 A EP04702270 A EP 04702270A EP 1611316 B1 EP1611316 B1 EP 1611316B1
Authority
EP
European Patent Office
Prior art keywords
shaft
cam
adhesive
clearance
diameter
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.)
Expired - Lifetime
Application number
EP04702270.2A
Other languages
German (de)
English (en)
Other versions
EP1611316A1 (fr
Inventor
Dietrich Zaps
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.)
Thyssenkrupp Dynamic Components Teccenter AG
Original Assignee
ThyssenKrupp Presta TecCenter AG
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 ThyssenKrupp Presta TecCenter AG filed Critical ThyssenKrupp Presta TecCenter AG
Publication of EP1611316A1 publication Critical patent/EP1611316A1/fr
Application granted granted Critical
Publication of EP1611316B1 publication Critical patent/EP1611316B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • 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

Definitions

  • the invention relates to a camshaft for receiving cams according to the preamble of claim 1 and a method for producing a camshaft according to claim 10.
  • Camshafts of this type are used for controlling machine parts, in particular for controlling parts in internal combustion engines, such as for valves.
  • composite camshafts also referred to as built camshafts
  • control cam are mounted on the NOkkenwelle and fastened in the designated place, for example by welding or pressing with the shaft. It has also been proposed to glue cams with a shaft to fix them to the shaft.
  • Camshafts of this type are for example from the European patent EP 0 340 128 B1 known.
  • the object of the invention is to eliminate the disadvantages of the prior art.
  • the object is to realize a camshaft with a suitable manufacturing process, which allows cams to add dimensionally precise with little deformation on the shaft with consistently high quality and this with high efficiency.
  • the object is achieved by the formation of a camshaft according to the features of claim 1 and by a manufacturing method according to the features of claim 10.
  • the dependent claims define further advantageous embodiments of the camshaft or the manufacturing process.
  • a cam with its recess which has a structured surface
  • a shaft with a likewise structured surface the remaining spaces being formed by the surface structuring between the cam recess and the shaft with a hardenable adhesive or Kitt vekittet
  • adhesive should be used as a generic term for putty, glue or other plastic materials suitable for the application.
  • the structuring of the shaft surface is provided in sections where cams are to be fixed.
  • the structuring of the shaft surface should be carried out mechanically such that the resulting new diameter of the structuring by material displacement is greater than the original pipe diameter and thus the cam can be pushed unhindered over the non-structured pipe part.
  • the structuring the recess of the cam has a slightly smaller diameter relative to the structured surface of the shaft, so that compression takes place when the cam is mounted on the shaft structuring so that the surface structures, in particular that of the shaft, are slightly deformed or even easily cut by the surface structuring of the recess of the cam.
  • the structured surfaces are provided with a hardenable adhesive.
  • This adhesive may be of the type a multi-component adhesive or an adhesive that is curable by heat, UV or other known methods.
  • an adhesive is provided which is activated directly during the mounting process for curing.
  • two types of adhesive are preferred.
  • One type is adhesive, which has at least two components.
  • the components may be applied to the surface of the shaft by applying one component to the surface of the recess of the cam and the other component.
  • the activation takes place exactly during the joining process, when the two components of the adhesive mix at the final joining location.
  • the adhesive itself is encapsulated in very small spheres which are spread on the surface in a mass and burst when pressure forces occur.
  • the actual adhesive and the corresponding chemical reactions are released, so that the bonding or cementing takes place.
  • the activation of the adhesive takes place by pressing the two components exactly at the final joint location, here by releasing the adhesive from the very small beads.
  • the inventive method not only a mechanical compression connection of the cam is generated with the shaft, but in addition by filling the remaining gaps between the cam and shaft with an adhesive cementing of the parts is achieved, which allows a better force and positive engagement of the parts, with the result that a high strength of the connection is made possible.
  • the cured putty thus allows the transmission of torque.
  • the adhesive used should not have shrinking properties for this purpose, but rather easily expand during the curing process.
  • the inventive construction of the connection now makes it possible to dimension the parts to be joined with their structured surfaces to be pressed in such a way that substantially lower forces are required for pressing than was hitherto customary. This makes it possible to raise cams more precisely and with less deformation.
  • filigree cams such as easily deformable thin metal cams apply with the required final precision and low joint stresses.
  • the expensive post-processing effort can be minimized or even completely eliminated.
  • the putty does not completely fill the interstices and deliberately remain hollow spaces. These cavities may then allow, for example, a certain oil flow or creep of oil for lubrication purposes by the compound.
  • the application of the adhesive can be done simply by opposing rollers, so that the tube is not coated on the entire circumference.
  • a portion of an assembled camshaft according to the invention is in three-dimensional oblique view in Fig. 1 shown.
  • the shaft 1 preferably consists of a tubular body and the cams 2 are mounted on the shaft 1 to the desired position and fixed.
  • Both the shaft 1 and the shaft 2 are made of a ductile material, wherein at least one of the involved parts of a metal, preferably both of the two parts, consists of a metal such as steel or alloy steel.
  • this has a recess 4 with a base circle diameter A, as shown in cross section in Fig. 2 is shown.
  • this recess 4 structuring is provided, which is preferably formed in the axial direction 3 of the shaft 1, and which consists of at least one projection 5.
  • a plurality of projections 5 are arranged on the surface of the recess 4 and distributed with advantage on the circumference thereof.
  • the surface 5 'of the structured recess 4 formed from the projections 5 enclose the circle diameter A1, which is smaller than the diameter A of the recess 4.
  • Such a structured surface 5, 5 ' is produced, for example, by a clearing method. It is then readily possible to increase the number of projections 5 in such a way that the surface of the recess 5 can be produced in the form of a type of internal toothing. Between the projections 5 and the internal toothing, which represent the surface structuring, a structure gap 7 is formed.
  • the surface of the shaft 1 is at least in partial areas where a cam 2 is to be fixed, applied approximately to the width of the cam to be fixed, a surface structure 6 on the shaft 1.
  • the outer diameter D1 of the structured shaft surface 6 should be slightly larger than the original adjacent shaft diameter D.
  • the structured surface 6 of the shaft 1 should be advantageously formed by material displacement, in particular with a knurling, rolling or polishing.
  • the cam 2 is mounted for fixing on the shaft 1 to the appropriate position and thereby pressed as a prefix. Since the diameter D1 of the structured wave surface 6 is slightly larger than the diameter A1 of the textured surface 5 'of the recess 4 of the cam 2, the mounting of the cam 2 on the shaft 1 must be done with a corresponding effort to achieve a compression and thus a prefixing of the cam 2 on the shaft 1. In this process, at least parts of the one and / or other structured surface 6, 5 'are at least elastically deformed. It is also possible, although not preferred, for some of this material to be machined away from the material of the surface structures during this process. To facilitate the process, can be attached to one side of the recess 4 of the cam 2 Ein Fabricfase.
  • At least one of the two structured surfaces 6, 5 'of the shaft 1 and the recess 4 of the cam 2 are covered with a curable adhesive before mounting the cam 2.
  • the structural gaps of the surface structures 6, 5 'of the shaft 1 and the cam recess 4 are filled with a flowing adhesive.
  • the remaining structure gaps 7, 8 of the structured surfaces 6, 5 ' are also filled with adhesive, as in Fig. 4 is shown in cross section.
  • the adhesive should not shrink after curing. It is better to use an adhesive that expands at least slightly after curing. This ensures that a good form and adhesion of the connection is generated and the cam 2 is well supported on the shaft surface.
  • the adhesive is a component adhesive, such as a two-component adhesive.
  • a component adhesive of two components a component is applied to the structured surface 6 of the shaft 1 and applied to the structured surface 5 of the recess 4 of the cam 1, the other component of the adhesive.
  • the two components mix, for example by diffusion, and the adhesive is activated, that is, can act as an adhesive.
  • an adhesive which is activated by the mechanically acting pressing forces during Aufziehvorgang.Hierbei is advantageously used an adhesive which is embedded embedded in the liquid mass in small neutral beads, which are crushed when exposed to the compressive stress and thus release the adhesive for the reaction.
  • the liquid mass and the adhesive included in the neutral beads may also be two components of a component adhesive.
  • Another possibility is to achieve the curing of the adhesive by the action of temperature.
  • the desired expansion of the adhesive may also be due to the incorporation of constituents of the ambient atmosphere, in particular, the water vapor particles of humidity in the adhesive take place after activation.
  • the present invention it is now possible to predetermine the compression forces by dimensioning the mechanical compression so that only small compression forces are necessary, which now a gentle joining method for cam 2 on a shaft 1 is possible.
  • the dimensioning of the surface structures 5, 6 depending on the materials used and the diameters D1, A1 of the structured surfaces 5, 6 to be meshed with one another can now be selected such that substantially smaller pressure forces are necessary than hitherto, namely less than 8 kN. Particularly advantageous pressing forces are given by less than 5 kN.
  • the cogging of the structural interspaces 7, 8 nevertheless achieves mechanically strong connections of the cams 2 with the shaft 1.
  • the main advantage of this is that the cams must be much less deformed to achieve the same strength of the compound. It can also be very sensitive cams such as metal cams and also narrow cams with little deformation or delay on the shaft 1 are arranged.
  • the cams may be hardened contrary to previous practice prior to assembly, which is particularly cost-effective as bulk material.
  • the dimensioning of the mechanical compression is also advantageously carried out such that the inner diameter A of the recess 4 of the cam 2 is widened in a range of 0.05% to 0.5% of the diameter by the pressing.
  • the expansion can be preferably further reduced, namely to 0.1% to 0.2% of the inner diameter A of the recess 4 of the cam 2. Due to the much lower Aufzieh employed cams can now be fixed with much lower fret strengths , For example, of less than 4 mm thickness in the base circle area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Claims (10)

  1. Arbre à cames pour moteurs à combustion interne comprenant un arbre (1) avec un diamètre extérieur (D) et au moins une came (2) poussée pour la raccorder sur l'arbre (1), qui présente un évidement (4) de diamètre (A), et cet évidement (4) présentant une première surface (5) structurée rehaussée radialement vers l'intérieur avec un diamètre de cercle intérieur (A1), constituée d'au moins une saillie (5) qui forme des espaces intermédiaires de structuration (7), l'arbre (1), au moins en partie dans des régions au niveau desquelles est montée une came (2), présentant une deuxième structuration rehaussée (6) avec des espaces intermédiaires de structuration (8) avec le diamètre d'arbre agrandi (D1), et en ce que la came (2) est poussée avec sa surface structurée (5) de l'évidement (4) sur la surface structurée (6) de l'arbre (1) de telle sorte qu'au moins des régions partielles de l'une (5) et/ou de l'autre (6) des structures de surface (5, 6) soient déformées au moins élastiquement et/ou soient pressées les unes dans les autres par usinage, caractérisé en ce que les cavités entre la came (2) et l'arbre (1), constituées des espaces intermédiaires (7, 8) des deux surfaces structurées pressées (5, 6), sont cimentées avec un adhésif ou un mastic (10) durcissable essentiellement au moins par engagement par correspondance de formes et en ce que l'adhésif (10) est dilaté après le durcissement.
  2. Arbre à cames selon la revendication 1, caractérisé en ce qu'un couple peut être transféré à l'adhésif durci ou au mastic (10) durci par l'engagement par correspondance de formes.
  3. Arbre à cames selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la surface structurée (5') de l'évidement (4) de la came (2) est une structure évidée (5) et cette structure (5) se compose de préférence de plusieurs saillies (5) et celles-ci sont disposées de manière répartie sur la périphérie de l'évidement (4).
  4. Arbre à cames selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface structurée (6) de l'arbre (1) est réalisée par refoulement de matière, de préférence est moletée, laminée ou notamment roulée.
  5. Arbre à cames selon l'une quelconque des revendications précédentes, caractérisé en ce que l'adhésif (10) ne présente aucun retrait après le durcissement.
  6. Arbre à cames selon l'une quelconque des revendications précédentes, caractérisé en ce que l'adhésif (10) est un adhésif à composants.
  7. Arbre à cames selon l'une quelconque des revendications précédentes, caractérisé en ce que la came (2) est pressée sur l'arbre (1) avant le durcissement de l'adhésif (10) avec une force inférieure à 8 KN.
  8. Arbre à cames selon la revendication 7, caractérisé en ce que la came (2) est pressée sur l'arbre (1) avant le durcissement de l'adhésif (10) avec une force inférieure à 5 KN.
  9. Arbre à cames selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre intérieur (A) de l'évidement (4) de la came (2) est élargi de 0,05 % à 0,5 %, de préférence de 0,1 % à 0,2 % par le pressage et/ou à la suite de l'opération d'assemblage incluant la dilatation de l'adhésif (10).
  10. Procédé de fabrication d'un arbre à cames pour moteurs à combustion interne comprenant un arbre (1) avec un diamètre extérieur (D) et au moins une came (2) poussée pour la raccorder sur l'arbre, qui présente un évidement (4) de diamètre (A), et cet évidement (4) présentant une première surface (5) structurée rehaussée radialement vers l'intérieur avec un diamètre de cercle intérieur (A1), constituée d'au moins une saillie (5) qui forme des espaces intermédiaires de structuration (7), l'arbre (1), au moins en partie dans des régions au niveau desquelles est montée une came (2), présentant une deuxième structuration rehaussée (6) avec des espaces intermédiaires de structuration (8) avec le diamètre d'arbre agrandi (D1), et en ce que la came (2) est poussée avec sa surface structurée (5) de l'évidement (4) sur la surface structurée (6) de l'arbre (19) de telle sorte qu'au moins des régions partielles de l'une (5) et/ou de l'autre (6) des structures de surface (5, 6) soient déformées au moins élastiquement et/ou soient pressées les unes dans les autres par usinage, caractérisé en ce que les cavités entre la came (2) et l'arbre (1), constituées des espaces intermédiaires (7, 8) des deux surfaces structurées pressées (5, 6), sont cimentées avec un adhésif ou un mastic (10) durcissable essentiellement au moins par engagement par correspondance de formes et en ce qu'un adhésif (10) qui est dilaté après le durcissement est utilisé.
EP04702270.2A 2003-03-08 2004-01-15 Arbre a cames dont les cames sont engagees par pression Expired - Lifetime EP1611316B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3542003 2003-03-08
PCT/CH2004/000018 WO2004079163A1 (fr) 2003-03-08 2004-01-15 Arbre a cames dont les cames sont engagees par pression

Publications (2)

Publication Number Publication Date
EP1611316A1 EP1611316A1 (fr) 2006-01-04
EP1611316B1 true EP1611316B1 (fr) 2017-07-19

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EP04702270.2A Expired - Lifetime EP1611316B1 (fr) 2003-03-08 2004-01-15 Arbre a cames dont les cames sont engagees par pression

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EP (1) EP1611316B1 (fr)
WO (1) WO2004079163A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004062518B4 (de) * 2004-12-24 2006-10-26 Thyssenkrupp Automotive Ag Nocken für gebaute Nockenwellen
DE102006027494A1 (de) * 2006-06-14 2007-12-20 Henkel Kgaa Welle mit fixiertem Bauteil
DE102009037128A1 (de) * 2009-08-11 2011-02-17 Neumayer Tekfor Holding Gmbh Verfahren zur Herstellung einer Nockenwelle und Nockenwelle
DE102009057633B3 (de) * 2009-12-09 2011-03-31 Thyssenkrupp Presta Teccenter Ag Verfahren zur Herstellung einer gebauten Nockenwelle, Nockenwellengrundkörper und gebaute Nockenwelle
DE102013005713A1 (de) 2013-03-30 2014-10-02 Thyssenkrupp Presta Teccenter Ag Spannnest mit Fixierelementen
DE102014106924A1 (de) * 2014-05-16 2015-11-19 Thyssenkrupp Presta Teccenter Ag Verfahren zur Herstellung einer gebauten Nockenwelle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227693C2 (de) * 1982-07-24 1985-06-13 Mahle Gmbh, 7000 Stuttgart Verfahren zur Herstellung einer Nockenwelle für Verbrennungsmotoren
FR2541720B1 (fr) * 1983-02-24 1987-05-22 Citroen Sa Arbre a cames frittees collees
DE3717190A1 (de) * 1987-05-22 1988-12-15 Supervis Ets Nockenwelle zur steuerung von ventilen bei verbrennungskraftmaschinen und verfahren zu ihrer herstellung
FR2630790B1 (fr) 1988-04-28 1994-04-08 Valtubes Procede d'assemblage d'un arbre a cames rapportees et arbre a cames ainsi obtenu
JPH02150544A (ja) * 1988-11-21 1990-06-08 Press & Stanzwerk Ag カムシャフト

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2004079163A1 (fr) 2004-09-16
EP1611316A1 (fr) 2006-01-04

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