EP1611316A1 - Nockenwelle mit aufgepressten nocken - Google Patents
Nockenwelle mit aufgepressten nockenInfo
- Publication number
- EP1611316A1 EP1611316A1 EP04702270A EP04702270A EP1611316A1 EP 1611316 A1 EP1611316 A1 EP 1611316A1 EP 04702270 A EP04702270 A EP 04702270A EP 04702270 A EP04702270 A EP 04702270A EP 1611316 A1 EP1611316 A1 EP 1611316A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- cam
- adhesive
- recess
- 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.)
- Granted
Links
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 to control machine parts, in particular to control parts in internal combustion engines, such as for valves.
- assembled camshafts also referred to as built-up camshafts
- control cams are mounted on the camshaft and fastened at the location provided, for example by welding or pressing with the shaft. It has also been proposed to glue cams to a shaft in order to fix them to the shaft.
- Camshafts of this type are known, for example, from European patent EP 0 340 128 B1.
- a cam with its recess which has a structured surface
- a shaft with a likewise structured surface the remaining spaces formed by the surface structures between the cam recess and the shaft with a hardenable one
- Adhesive or putty is cemented.
- the term adhesive should be used as a generic term for putty, adhesive or other plastic materials suitable for the application.
- the structure of the shaft surface is provided in sections where cams are to be fixed.
- the structuring of the shaft surface is to be carried out mechanically in such a way that the new diameter of the structuring due to material displacement is larger than the original pipe diameter and thus the cam can also be pushed freely over the unstructured pipe part.
- the structural The recess of the cam has a slightly smaller diameter than the structured surface of the shaft, so that when the cam is pulled onto the shaft structure, compression takes place, such that the surface structures, in particular that of the shaft, are slightly deformed or even slightly machined by the surface structure of the Recess of the cam.
- the structured surfaces are provided with a curable adhesive.
- This adhesive can be of the multi-component type or an adhesive that is curable by heat, UV or other known methods.
- an adhesive is provided, which is activated for curing during the mounting process. Two types of adhesive are preferred for this.
- One type is adhesive that has at least two components.
- the components can be applied by applying one component to the surface of the recess of the cam and the other component to the surface of the shaft.
- the activation takes place exactly during the joining process when the two components of the adhesive mix at the final joining location.
- the adhesive is encapsulated even in very small spheres, which are spread on the surface in one mass and burst when pressure forces occur. The actual adhesive and the corresponding chemical reactions are thus released so that the bonding or cementing takes place.
- the adhesive is activated by pressing the two components precisely at the final joint location, here by releasing the adhesive from the very small beads.
- the procedure according to the invention not only produces a mechanical press connection of the cams to the shaft, but additionally, by filling the remaining gaps between the cam and the shaft with an adhesive, the parts are cemented, which improves the positive and positive locking of the parts enables, with the result that a high strength of the connection is made possible.
- the hardened putty thus enables torque to be transmitted.
- the adhesive used should not have shrinking properties, but should expand slightly during the curing process.
- the design of the connection according to the invention now makes it possible to dimension the parts to be connected with their structured surfaces to be pressed in such a way that much lower forces are required for pressing than was previously the case. This makes it possible to open cams more precisely and with less deformation.
- filigree cams such as easily deformable thin sheet metal cams
- This can also minimize or even eliminate the expensive post-processing work.
- the putty does not completely fill the gaps and deliberately remains voids. These cavities can then allow, for example, a certain oil flow or oil creep through the connection for lubrication purposes.
- the adhesive can be applied simply by means of opposing rollers, so that the pipe is not coated over the entire circumference.
- Fig. 1 shows a portion of a camshaft with two cams in a three-dimensional representation
- FIG. 2 shows a cross section of a cam for a camshaft according to FIG. 1
- Fig. 3 is a side view of a portion of a shaft with a textured surface area where a cam is to be positioned and fixed
- FIG. 4 shows a side view of the partial area of a shaft according to FIG. 3 with the cam pulled open and the inventive cementing of the spaces between the structured surfaces
- FIG. 1 A partial section of an assembled cam follower according to the invention is shown in three-dimensional oblique view in FIG. 1.
- 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, at least one of the parts involved consisting of a metal, preferably both of the two parts, consisting of a metal such as steel or alloy steel.
- a recess 4 with a base circle diameter A, as shown in cross section in FIG. 2.
- Structuring is provided on the inward surface of this recess 4, 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 advantageously distributed over their circumference.
- the surface 5 'of the structured recess 4 formed from the projections 5 enclose the circular diameter AI, which is smaller than the diameter A of the recess 4.
- Such a structured surface 5, 5 ' is produced, for example, by a broaching process. It is then easily 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.
- a structural space 7 is formed between the projections 5 or the internal toothing, which represent the surface structure.
- the surface of the shaft 1 is applied to the shaft 1 at least in partial areas where a cam 2 is to be fixed, for example to the width of the cam to be fixed.
- the outer diameter D1 of the structured shaft surface 6 should be somewhat larger than the original adjacent shaft diameter D.
- the structured surface 6 of the shaft 1 should advantageously be formed by material displacement, in particular using a knurling method, rolling or also polishing.
- the cam 2 is drawn onto the corresponding position for fixation on the shaft 1 and thereby pressed as a pre-fixation. Since the diameter Dl of the structured shaft surface 6 is slightly larger than the diameter AI Structured surface 5 'of the recess 4 of the cam 2, the cam 2 must be pulled onto the shaft 1 with a corresponding amount of force in order to achieve compression and thus a pre-fixing of the cam 2 on the shaft 1. In this process, at least parts of one and / or other structured surface 6, 5 'are at least elastically deformed. It is also possible, although not preferred, for some of the material of the surface structures to be cut during this process. In order to facilitate the process, an insertion chamfer can be attached to one side of the recess 4 of the cam 2.
- At least one of the two structured surfaces 6, 5 1 of the shaft 1 and the recess 4 of the cam 2 are coated with a curable adhesive before the cam 2 is pulled on.
- the structural spaces between the surface structures 6, 5 'of the shaft 1 and the cam recess 4 are filled with a flowing adhesive.
- the remaining structural spaces 7, 8 of the structured surfaces 6, 5 ' are also filled with adhesive, as shown in cross section in FIG. 4.
- the adhesive is activated accordingly, as has already been described above.
- the adhesive should not show any shrinkage after curing. It is better to use an adhesive that will expand at least slightly after curing. This ensures that a good form and force closure is produced of the compound and the cam 2 on the Wel ⁇ lenober Assembly is well supported is ensured.
- good results are achieved with regard to cementing the structural spaces 7, 8 if the adhesive is a component adhesive, such as a two-component adhesive.
- a component adhesive consisting of two components
- one component is applied to the structured surface 6 of the shaft 1 and the other component of the adhesive is applied to the structured surface 5 of the recess 4 of the cam 1. If the two components are brought into connection by pre-fixing the cam 2 on the shaft 1, the two components mix, for example by diffusion, and the adhesive is activated, which means that its action as an adhesive can develop.
- an adhesive which is activated by the mechanically acting pressing forces during the mounting process.
- an adhesive is advantageously used, which is embedded in the liquid mass in small neutral spheres, which are crushed when the compressive stress is applied and thus release the adhesive for the reaction.
- the liquid mass and the adhesive enclosed in the neutral beads can also be two components of a component adhesive.
- Another possibility is to achieve the curing of the adhesive by exposure to temperature.
- the desired expansion of the adhesive can also be achieved by storing components of the surrounding atmosphere, in particular the water vapor particles of the air humidity in the adhesive after activation.
- the activation of the adhesive by the pre-fixing can also be dispensed with and the adhesive can be active from the beginning.
- this has the disadvantage that the joining operation must take place within a very short time after the adhesive has been applied, and the risk of insufficient strength and misalignment of the connection increases.
- the pressing forces by dimensioning the mechanical pressing in such a way that only small pressing forces are necessary, which now enables a gentle joining process for cams 2 on a shaft 1.
- 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 implemented in one another can now be selected such that substantially smaller press-on forces are required than previously, namely less than 8 kN. Press-on forces of less than 5 kN are particularly advantageous.
- the cementing of the structural spaces 7, 8 nevertheless achieves mechanically strong connections between the cams 2 and the shaft 1.
- the main advantage here is that the cams have to be deformed much less in order to achieve the same strength of the connection.
- cams such as preferably plate cam and cam narrow low Deformati ⁇ on or delay on the shaft 1 are arranged.
- the use of sintering cams is also possible.
- the cams can be fully hardened before assembly, which is particularly inexpensive as bulk material.
- the dimensioning of the mechanical pressing is also advantageously carried out in such a way that the inner diameter A of the recess 4 of the cam 2 is widened by the pressing in a range from 0.05% to 0.5% of the diameter.
- the procedure according to the invention can, however, preferably further reduce the expansion, namely to 0.1% to 0.2% of the inner diameter A of the recess 4 of the cam 2.
- the much lower drawing forces mean that cams can now also be fixed with much smaller collar thicknesses, for example less than 4 mm 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH3542003 | 2003-03-08 | ||
PCT/CH2004/000018 WO2004079163A1 (de) | 2003-03-08 | 2004-01-15 | Nockenwelle mit aufgepressten nocken |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1611316A1 true EP1611316A1 (de) | 2006-01-04 |
EP1611316B1 EP1611316B1 (de) | 2017-07-19 |
Family
ID=32932305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04702270.2A Expired - Lifetime EP1611316B1 (de) | 2003-03-08 | 2004-01-15 | Nockenwelle mit aufgepressten nocken |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1611316B1 (de) |
WO (1) | WO2004079163A1 (de) |
Families Citing this family (6)
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)
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 |
-
2004
- 2004-01-15 EP EP04702270.2A patent/EP1611316B1/de not_active Expired - Lifetime
- 2004-01-15 WO PCT/CH2004/000018 patent/WO2004079163A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2004079163A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004079163A1 (de) | 2004-09-16 |
EP1611316B1 (de) | 2017-07-19 |
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