EP1828551A1 - Cames destinees a des arbres a cames fabriques - Google Patents

Cames destinees a des arbres a cames fabriques

Info

Publication number
EP1828551A1
EP1828551A1 EP05808227A EP05808227A EP1828551A1 EP 1828551 A1 EP1828551 A1 EP 1828551A1 EP 05808227 A EP05808227 A EP 05808227A EP 05808227 A EP05808227 A EP 05808227A EP 1828551 A1 EP1828551 A1 EP 1828551A1
Authority
EP
European Patent Office
Prior art keywords
cam
sheet metal
profiled sheet
metal strip
strip
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.)
Withdrawn
Application number
EP05808227A
Other languages
German (de)
English (en)
Inventor
Manfred Muster
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 Automotive 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 Automotive AG filed Critical ThyssenKrupp Automotive AG
Publication of EP1828551A1 publication Critical patent/EP1828551A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/02—Camshafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12201—Width or thickness variation or marginal cuts repeating longitudinally
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams

Definitions

  • the invention relates to cams for built camshafts, preferably for use in internal combustion engines.
  • the invention also relates to metal strips for producing such cams and to a method for producing these cams.
  • the invention relates to camshafts manufactured using these cams.
  • the invention also relates to cam discs / eccentric discs as well as built using these cams / eccentric discs built cam discs / eccentric shafts.
  • camshafts Built camshafts are known from the prior art.
  • cams are sintered as individual parts (DE 37 17 190 C2), forged (DE 41 21 951 C1) or bent from sheet metal strips, which are then welded (WO 01/98020 A1). The cams are then pushed onto a shaft, connected to the shaft and thus installed to camshafts.
  • the forged cams also have a number of disadvantages.
  • the cams can be forged only with radii on the front sides, so that the actually available as tread width is smaller than the cam width, or a lot of cam material on the circumference or the end faces of the cams must be removed.
  • the width which can not be used for the cam track depends greatly on the cam contour, the material used and other parameters and is in a value range of about 1 mm to about 1.5 mm.
  • the object of the invention is therefore to provide a cam according to the preamble of claim 1, which requires as little as possible raw material use, in which the usable width of the tread is as large as possible and in particular simple and inexpensive by a non-positive and / or positive joining method can be connected to the support shaft. It is also an object of the invention to provide a simple and inexpensive method for producing such cams.
  • the object of the invention is also to provide a profiled sheet metal strip available, which is particularly well suited for the production of the cam according to the invention.
  • the invention has for its object to provide a camshaft in which the rigidity of conventional built camshafts with forged or sintered cams are at least almost achieved.
  • cam the object is achieved by a cam according to the features of patent claim 1.
  • Advantageous developments of the cam according to the invention are given in the dependent claims 2 to 14.
  • this object is achieved by a method according to claim 20.
  • Advantageous developments of the method are described in the subclaims 21 to 25.
  • the object is achieved by a profile sheet metal strip according to claim 15.
  • Advantageous embodiments of the profiled sheet metal strip are specified in the subclaims 16 to 19.
  • the object is achieved by a camshaft having the features of claim 26 and the subclaim 27th
  • the cam is formed from one or more preferably elongate profiled sheet strips, wherein each circumferential section of the cam contour of the cam is assigned exactly one profiled sheet metal strip or sectional sheet metal strip section and the strip or strips are produced by rolling technology and by bending or forming the strips and welding the strip ends a cam is formed.
  • a cam blank is created, which can then optionally be subjected to a pressure calibration.
  • the additional step of pressure calibration will not be required in practice in all cases.
  • the cam according to the invention has at the circular or circular-section-shaped inner contour region of the recess on a circumferential inlet chamfer, whereby it is achieved that the cam can be pushed well on the support shaft without tilting.
  • the entry chamfer facilitates the threading of the cam onto the support shaft.
  • Another advantage of the inlet chamfer is that the cam can be better positively and / or non-positively connected to the support shaft. For positive and / or non-positive connection of the cam with the support shaft diameter expansions are generated by local material displacement by rolling or knurling on the support shaft at certain axial positions. The cams are then pushed over these sections of the support shaft with the enlarged diameter, forming a positive and / or non-positive connection between the cam and the support shaft.
  • the run-in bevel is of particular importance because it ensures that there is no shearing of the support shaft material in the widened region when the cam is pushed onto the support shaft section with the diameter widening. In this way, an undesirable chip formation, which would lead to significant problems in practice in the cam assembly, effectively prevented.
  • the entry chamfer is introduced by rolling into the profile strip or strips. This is possible at low cost and it is unnecessary to additional forming or machining process for producing the inlet chamfer.
  • the inlet chamfer is formed on the belt section of the cam blank during this pressure calibration step. It is possible that the run-in chamfer is completely formed during the pressure-calibrating step. Likewise, however, it is also possible to deform the later belt portion forming strip areas during rolling by a certain amount in the context of the production of rolled profiled sheet metal strips, wherein the final shape of the later inlet chamfer is not yet reached. If the cam blank obtained after bending or forming the profiled sheet strips and the welding is then subjected to a pressure calibration, the final shape of the inlet chamfer can be formed during the pressure calibration step.
  • this profiled sheet metal strip has a point which corresponds to the location of the maximum cam lobe of the later cam blank.
  • the profiled sheet metal strip is symmetrical or asymmetrical with respect to a transverse axis extending through this location of the maximum cam elevation. In this way, the joining location, at which the end portions of the profiled sheet metal strip are welded together, can be arranged at any point along the circumference of the cam blank.
  • the inner wall of the recess A of the cam blank forms a joining contour for the non-positive and / or positive connection of the cam with the support shaft.
  • an engraving can be formed, for example, by teeth extending in the axial direction of the cam blank. These teeth engage behind the support shaft material when pushing the cams on a locally widened by means of rolling or knurling support shaft, thereby forming this, so that a positive connection is formed.
  • the inlet chamfer can be formed in the invention as an outwardly conically widening portion of the inner contour of the recess A. Already in this embodiment of the intake chamfer, it is achieved that the local diameter expansions are not sheared off, so that chip formation is prevented.
  • the entry chamfer can also be formed by a radius provided on the inner contour of the recess or a parabolic section widening outward.
  • the circular or Vietnameseabites- shaped inner contour region of the recess extends over a peripheral region with a circumferential angle of at least 300 °. This ensures a high mechanical strength of the non-positive and / or positive connection between the cam and the support shaft.
  • the invention is achieved in that an edge region of the profiled sheet metal strip is deformed by rolling such that this deformation forms after bending or deformation of the profile sheet strip for Nockenrohteil the inlet chamfer of this Nockenrohteils.
  • Such a rolling technical introduction of the inlet chamfer already in the stage of the rolling technical processing of the profiled sheet metal strip enables a production-technically cost-effective introduction of the inlet chamfers.
  • the continuous continuous production of the leading chamfer already on the profiled sheet metal strip (and not only on the bent cam blank) is thus particularly favorable in terms of manufacturing technology.
  • each longitudinal section of the profiled sheet strip is assigned to a specific circumferential section of the cam raw part and that the course of thickness in the longitudinal sections of the profiled sheet strip already essentially corresponds to the course of thickness in the corresponding peripheral sections of the cam blank.
  • protruding areas contain additional material for the compensation of the contraction of the material occurring during the bending or deformation of the profiled sheet strip to the cam base, wherein after the deformation, the two edge regions of the profile strip are aligned as accurately as possible perpendicular to the joining contour.
  • this engraving can already be produced in the corresponding length section of the profiled sheet metal strip during the rolling process of the profiled sheet metal strip.
  • This engraving can be designed as a toothing extending transversely to the rolling direction.
  • the object underlying the invention is achieved by a method for producing a cam for built camshafts, comprising the following method steps:
  • the cam blank In order in particular to bring the recess of the cam blank into the desired shape and to achieve the desired dimensions, it may be provided according to the invention to subject the cam blank to a pressure calibration step.
  • this final shape of the inlet chamfer can be generated in the context of the pressure calibration step, as part of the technical production of the profiled sheet metal strip.
  • the profiled sheet metal strips are interconnected by portions of lesser sheet thickness. These portions of lesser sheet thickness form connecting portions that can be particularly easily deform when reeling the endless belt because of the lower material thickness. It is understood that such a continuous rolling brings particularly low unit costs based on the profile sheet metal strip with it.
  • the invention also relates to assembled camshafts which have been manufactured using the cams according to the invention.
  • the support shafts of these built-in camshafts according to the invention have sections of expanded diameter at the axial positions where the cams are to be fastened.
  • the cams are pushed with the inlet bevel ahead of the support shaft and then pushed over the respective section with the expanded diameter, so that forms a positive and / or positive connection between the cam and the support shaft.
  • the chamfer while unwanted chip formation is prevented by shearing of support shaft material in the area of the expanded diameter.
  • the diametral widenings on the support shaft can be achieved by material displacement techniques, e.g. Rolling or knurling to be made.
  • the thickness of the respective profile sheet strip after the bending or forming operation corresponds at least approximately to a peripheral region with a circumferential angle of at least 300 ° of the belt thickness of the cam.
  • a particularly high mechanical strength of the non-positive and / or positive connection between cam and support shaft is achieved when the circumferential angle, in the region of the thickness of the respective profile sheet strip after the bending or forming operation of the belt thickness of the cam at least approximately corresponds, over an angular range extending from 360 °.
  • the shape of the development of the cam which has the blank contour, corresponds approximately to the shape of the one or more adjacent the laid, the cam forming profiled sheet metal strip.
  • appropriate distortions and material merging held so that ultimately the desired blank contour of the cam is formed.
  • the forming operations can be carried out at room temperature as well as at elevated temperature as needed.
  • the profiled sheet metal strip is usually made of a high-grade steel, preferably made of 100Cr6 or 16MnCr5.
  • any resulting weld beads are removed either by scraping, peeling or broaching - preferably before joining onto the support shaft - or during the production of the finished contour of the cam.
  • the cam is formed to the desired blank contour in a pressure calibration process performed at room temperature or elevated temperature.
  • the cam is hardened if necessary and tempered if necessary.
  • the cam thus formed is, if necessary, annealed between the individual operations.
  • the cam contour is brought to the finished contour by mechanical processing, for example grinding and / or high-speed milling, before or after assembly onto the shaft.
  • the cam thus formed is preferably joined by means of force and / or positive connection to the support shaft.
  • the support shaft which can also be designed as a pipe to save weight, widened at predetermined axial positions, for example by rolling ren and then pushed the cam on the support shaft and set in the expanded area.
  • Particularly advantageous is the expansion by means of material displacement, as can be achieved by rolling, in particular by rolling or knurling.
  • the beads may be aligned in the transverse direction, in the longitudinal direction or at a different angle or even crosswise.
  • the recess of the cam is provided with an engraving, the joining contour of the cam, for example, a toothing in the longitudinal direction, and the expansion of the support shaft by rolling in the transverse direction.
  • the desired joining contour of the cam for example the engraving or toothing, is introduced into the cam during a pressure calibration in which further functional surfaces can also be formed or improved in their precision.
  • the engraving can be rolled already during the rolling process of the profile strips on the later serving as the joining contour of the cam surface. It is also provided to generate a preform for the joining contour during the rolling process, which is formed during the pressure-calibrating process in the finished shape of the joining contour.
  • An entry chamfer is located on the side of the cam which, when pushed onto the tube, points in the direction of the expanded tube areas.
  • the desired chamfers are introduced directly into the profile strip during the rolling process. If necessary, during pressure calibration, if this is provided, the intake chamfer is formed or recalibrated into the joining contour.
  • chamfers are also required for other joining methods for joining the cams on the support shaft.
  • a bevel makes sense, if not necessary.
  • suitable entry chamfers ensure a uniform and gentle joining operation, in which cracks in the cam can be prevented.
  • Infeed chamfers which are open as a cone with a cone angle in the range of 5-10 °, and whose largest diameter is slightly larger than the largest diameter of the widened rolling beads or engraving, are considered to be particularly advantageous.
  • the inlet chamfer is formed with a plurality of consecutively arranged cones or cone sections with different cone angles.
  • two consecutive cone sections with a first angle ⁇ 2 between 5 and 10 ° and a second angle cti between 0.5 and 4 ° proven, wherein during assembly of the cone with the larger angle, the pipe expansion overflows first.
  • cone-like openings differently widened openings, for example, with radius (radius r) or parabolic-shaped widening may be advantageous.
  • the person skilled in the art immediately realizes that the bending or forming process of the profiled sheet metal strip is not an easy process to control. It is known that thin sheets can be bent best and with increasing sheet thickness, the quality of the Umformdozenss is lower. This means that, especially in the case of cam contours with large maximum cam elevations and the required high rigidity, the degree of deformation, the bending forces, the risk of cracking and the deformations transverse to the bending direction greatly increase.
  • the profile strip according to the invention is formed before the bending process with a special thickness profile.
  • the aim is to bring on the one hand the strip thickness reached after the bending process on the widest possible areas of the circumference on the belt thickness of the cam, and on the other hand at the same time to limit the bending deformation as possible to areas with a small strip thickness.
  • the design of the profile of the profile strip is divided into sections with larger thicknesses and at the same time low deformation and sections with smaller thicknesses and at the same time higher forming and set a corresponding thickness distribution.
  • the profiled sheet metal strips are rolled so endlessly that between the strip sections required for the cams special tapers are provided in the sheet thickness, in which the reeling of the strip almost the entire bend takes place, so that the remaining areas of the strip not by reeling be bent or pre-formed.
  • the available degree of deformation of the profile is almost completely provided for the production of the cam.
  • An important aspect of the solution according to the invention consists in the division of the peripheral portions of the cam and the respective assignment to a particular profiled sheet metal strip or profiled sheet metal strip section and the welding connection of profiled sheet metal strips after the respective bending or forming operation.
  • cams with a large cam lobe of the cam is usually formed from more than one, preferably two elongated profiled sheet metal strips.
  • the base circle region of the cam from a profiled sheet metal strip with an approximately rectangular cross section and over the length of the same thickness, the lower belt.
  • the cam lobe is formed from a second profiled sheet metal strip, the upper band, which is designed in accordance with the above teaching.
  • the two profile sheet strips, which were separated from the upper belt and the lower belt respectively, are joined together in one operation by resistance welding or beam welding. Advantages of such a division are u.a. the shorter machine cycle time, welding without uncontrolled electrical shunts and the possibility of using the same sub-band for different cams.
  • Figure 1 shows a cam 1 according to the invention in a perspective view
  • FIG. 2 shows a cam 1 according to the invention in an axial view with another division of the individual profile strips 2;
  • FIG. 3 and FIG Figure 4 shows two embodiments of the rolled endless belt, from which the elongated profile strips are cut for the production of the cams, wherein the two bands are intended for two different peripheral portions of the cam.
  • FIG. 5 shows a cross section through the profile band corresponding to the section A-A in FIGS. 3 and 4.
  • FIG. 6 shows the endless belt of one of the profile strips wound on reel 13, in this case the example of upper belt 3.
  • FIG. 7 shows steps for the manufacture of the cam.
  • the figures 7a and 7b show the assembly of the upper band 3 and the lower band 4.
  • the finished bent elongated profile strips 2 are shown.
  • FIG. 9 shows the finished cam 1.
  • FIGS. 10, 11 and 12 illustrate the bending operation of the profile strip using the example of the upper belt 3.
  • FIG. 10 shows the ready-made upper belt 3 and
  • FIGS. 11 and 12 show two steps of the bending operation.
  • FIGS. 11a and 12a show a comparison with FIG Figures 11 b and 12 b only another bending core has been used.
  • Figures 13 and 14 show the process of pressure calibration seen in the axial and transverse directions.
  • FIGS. 15 and 16 each show a cam 1 in cross section, on which two different examples of the entry chamfer 8 and one example of an engraving 21 in the joining contour 6 are presented.
  • FIG. 17 the joining process of the cam 1 to the support shaft 11 expanded in the region 12 is shown.
  • FIGS. 18, 19 and 20 show different examples of cam shapes, although other shapes and parting planes 5 are also conceivable.
  • Figure 21a gives an example of an asymmetrical profile strip 2, as it is approximately necessary for the cam 1, shown in the division according to Figure 2.
  • Figure 21b gives an example of a symmetrical profile strip, as it is approximately necessary for the cam 1, shown in the division according to FIG. 1.
  • FIG. 22 shows an example of a rolled profile in which the profile strips 2 used to form the cam are cut out of the profile transversely to the rolling direction (WR), the dividing lines in the picture being indicated by the dashed lines.
  • Fig. 23 gives an example of a cam which is formed as a cam.
  • the cam 1, as shown in Figure 1, is formed by the three profile strips 2, which are joined to the joints 5, preferably by means of resistance welding or resistance pressure welding.
  • the substantially circular joining contour 6 is designed so that it is adapted to the respective joining method, with which the cam is joined to the support shaft.
  • an engraving preferably axially extending small toothings, is introduced into the joining contour (not shown in FIGS. 1 and 2).
  • FIG. 2 illustrates on the cam 1 the belt thickness 7, which corresponds to the wall thickness of the cam, measured orthogonally to the axial direction of the camshaft.
  • an asymmetrical profiled sheet metal strip was used for producing the cam blank, so that the weld seam 5 lies in the position indicated in FIG. 2.
  • such a division may be advantageous.
  • Figures 3 and 4 show a top band 3 and a lower band 4, which is assembled in each case to profile strips.
  • This preferred case applies when the cam 1 is formed from two elongated profile strips 2 in such a way that, as shown in FIG. 9, the base circle region and the elevation region of the cam each consist of a single profiled strip 2.
  • the strip during reeling cf. also FIG.
  • predetermined bending points 14 are introduced, in particular into the upper strip, which completely absorb the circumferential bending during the hasp , This way will ensures that in those areas which are exposed to high degrees of deformation in the bending / forming process, not the available deformation capacity of the material is already partially or even completely consumed by the reeling. Where it is needed, the forming capacity is maintained.
  • the lines marked 15 represent the sectional contour for the assembly of the strip. Analogous predetermined bending points can also be introduced in the lower strip.
  • the profile is rolled not in the longitudinal direction as shown in Figs. 3 and 4, but in the transverse direction to the cam periphery of the profile pieces 2 used to form the cam.
  • the rolling direction WR is shown by an arrow in FIG.
  • the profile strips 2 are made by separating the starting workpiece along the dashed lines.
  • this embodiment is not preferable, since here the inlet chamfer 8 can be formed only in the pressure calibration process and the production of the lead angle is associated with material waste. For some special cam contours, it may still be necessary to manufacture the profile strips 2 from such starting workpieces.
  • FIG. 5 illustrates that already during the rolling process, the leading chamfer 8 has been rolled into the joining contour 6 of the cam in preform or finished form. It also facilitates threading onto the calibration mandrel 19 in the optional phase of pressure calibration.
  • 11a, 11b, 12a, 12b can be performed both in a die (not shown) and by means of tool elements (not shown). If necessary, bending mandrels with corresponding special shapes, for example, as shown in FIGS. 11a and 12a, are used to guide the deformation and the necessary material displacements in the respective band.
  • the profiled sheet metal strip 2 is not subjected to uniform deformation over its entire volume during the bending / forming operation.
  • the transverse contraction of the strip during the bending operation is kept low and / or by means of suitable profile cross-sectional geometries ; compensated for the profile strip.
  • the side surfaces of the profile strip with respect to the surface normal of the joining contour 6 during rolling by the lead angle ß1 or ß2 are formed inclined.
  • a surplus of material is provided on the surface of the profile strip opposite the joining contour 6, which is displaced during the deformation such that after the deformation the side surfaces of the then bent profile strip are aligned at least approximately orthogonally to the joining contour 6.
  • cam as shown by way of example in FIGS. 13 and 14.
  • the cam is thereby pushed onto the Kalibrierdorn 19, wherein at the same time the scraping operation for removing the weld beads at the welds 5 can be performed.
  • molds 20 of the cam is pressed into shape, as illustrated with arrows in Figs. 13 and 14.
  • the cam can also be pressed against the bottom 22 of the calibrating mandrel 19 (FIG. 13) by tools (not shown). In this way, the recess A and the inlet chamfer (8) can be calibrated exactly.
  • FIGS. 15 and 16 show two examples of the inlet chamfer 8 with the characteristic angles CH and c- 2 and the characteristic radius r, respectively.
  • the method for producing the cams makes it possible to form other engravings 21 in the joining contour 6 in a particularly simple manner.
  • cams according to the invention can also be joined to the support shaft by means of laser welding, electron beam welding or other joining methods.
  • Required form elements, such as welding shoulders, etc., can then be introduced in a simple manner by means of rolling into the profile strips.
  • cams can also be formed with the method in which the joining contour is not substantially circular. So you can add Ren, which are seen in the axial direction formed as polygons, are introduced with corresponding rounded corners during the bending operation.
  • the proposed solution of the invention is also applicable to cams or eccentric discs as a special case of cams with a special circumferential contour, as used for example to form an adjusting for the Verstellaktuatorik a mechanical variable valve train system use.
  • Such special cams can also be formed and joined according to the invention.
  • An example of such a cam is given in FIG. 23.
  • the weld seam 5 can advantageously be arranged in a region which is never in contact with a cam follower or a corresponding gear member which is directly actuated by the cam or the cam disk.
  • the weld seam 5 is preferably arranged in an area with a relatively low contact load compared with the remaining areas of the peripheral contour.
  • FIG. 17 shows how the cam 1 formed according to the invention is joined to the support shaft 11.
  • the cam in the direction of the arrow, the cam is pushed with its inlet chamfer 8 ahead over the widened region 12, wherein the widening into the toothing 21 of the joining contour 6 of the cam 1 forms and generates a force and form fit.
  • FIGS. 18, 19 and 20 show alternative shapes of the recess of the cam 1.
  • recesses as shown in Figure 18 or 19 may be formed.
  • FIGS. 18, 19 and 20 show an alternative possibility of the arrangement for the weld seam between the Profile strip from which the cam is formed. It should be noted that the shapes of the recess of the cam 1 shown here are not related to the arrangement of the weld shown here.
  • the profile strip shown in Figure 21a gives an example of a, with respect to the maximum cam lobe, asymmetric profile strip 2, as is required approximately for the cam 1, shown in the division of the profile strips according to the figure 2.
  • the cutting plane Q shown in the figure extends directly through the maximum cam lobe of the cam formed from the profile strip 2 by bending the longitudinal axis L.
  • the profile strip shown in Fig. 21 b gives an example of a, relative to the maximum cam lobe, symmetrical profile strip 2, as is required approximately for the cam 1, shown in the division of the profile strip according to FIG. 1.
  • the cutting plane Q shown in FIG. 21b extends directly through the maximum cam lobe of the cam formed from the profile strip 2 by bending the longitudinal axis L.
  • connection area 14 intended bending point, connection area

Landscapes

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

Abstract

L'invention concerne des cames destinées à des arbres à cames fabriqués, composés d'au moins une bande de tôle profilée (2) fabriquée par laminage, présentant des épaisseurs différentes dans son extension longitudinale, comportant deux zones terminales (2a). Ladite bande de tôle profilée (2) est courbée ou déformée pour former une ébauche de came (1) de telle manière que ses zones terminales (2a) entrent en contact mutuel ou sont soudées mutuellement, ou que ses zones terminales (2a) sont soudées aux zones terminales (2b) d'au moins une autre bande de tôle courbée ou déformée. L'ébauche de came (1) présente une cavité (A) destinée à recevoir un arbre porteur (11), présentant un contour intérieur essentiellement circulaire ou partiellement circulaire. L'invention vise à mettre en oeuvre une came nécessitant peu de matière première, dont l'épaisseur utile de la surface de roulement est la plus grande possible, et pouvant être connectée de façon simple et économique à l'arbre porteur par l'intermédiaire d'un procédé d'assemblage mécanique et/ou par friction. A cet effet, un biseau d'entrée est formé sur le contour intérieur.
EP05808227A 2004-12-24 2005-11-25 Cames destinees a des arbres a cames fabriques Withdrawn EP1828551A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004062518A DE102004062518B4 (de) 2004-12-24 2004-12-24 Nocken für gebaute Nockenwellen
PCT/EP2005/012619 WO2006072289A1 (fr) 2004-12-24 2005-11-25 Cames destinees a des arbres a cames fabriques

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EP1828551A1 true EP1828551A1 (fr) 2007-09-05

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DE102009025023A1 (de) 2009-06-10 2010-12-16 Neumayer Tekfor Holding Gmbh Verfahren zur Herstellung einer Nockenwelle und entsprechende Nockenwelle
US20110009997A1 (en) * 2009-07-13 2011-01-13 Willoughby James G Syringe assistant
DE102009052222B4 (de) * 2009-11-06 2022-02-03 Volkswagen Ag Verfahren zum Herstellen eines Nockenwellenstückes
DE102010045047A1 (de) * 2010-09-10 2012-03-15 Thyssenkrupp Presta Teccenter Ag Verfahren zum Zusammenbau eines Motormoduls
DE102016208968A1 (de) * 2016-05-24 2017-11-30 Thyssenkrupp Ag Schiebemodul einer Nockenwelle
DE102022206134A1 (de) * 2022-06-20 2023-12-21 Mahle International Gmbh Verfahren zum Herstellen eines Positionsgebers für eine Nockenwelle
CN118080989B (zh) * 2024-04-23 2024-08-09 广州太威机械有限公司 一种基于旋转工件的去毛刺工具

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DE102004062518B4 (de) 2006-10-26
DE102004062518A1 (de) 2006-07-06
US20080276888A1 (en) 2008-11-13
WO2006072289A1 (fr) 2006-07-13

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