EP0678351A1 - Method of producing a multi-belt pulley, form tool for carrying out the method and pulley thus obtained - Google Patents

Method of producing a multi-belt pulley, form tool for carrying out the method and pulley thus obtained Download PDF

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Publication number
EP0678351A1
EP0678351A1 EP95400617A EP95400617A EP0678351A1 EP 0678351 A1 EP0678351 A1 EP 0678351A1 EP 95400617 A EP95400617 A EP 95400617A EP 95400617 A EP95400617 A EP 95400617A EP 0678351 A1 EP0678351 A1 EP 0678351A1
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EP
European Patent Office
Prior art keywords
rim
axis
pulley
punch
symmetry
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
EP95400617A
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German (de)
French (fr)
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EP0678351B1 (en
Inventor
Gérard Magniez
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Financiere D'etude Et De Developpement Ind Ste
Original Assignee
FINANCIERE D'ETUDE ET DE DEVELOPPEMENT INDUSTRIEL ET TECHNOLOGIQUE Ste
SOFEDIT
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Publication of EP0678351A1 publication Critical patent/EP0678351A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/261—Making other particular articles wheels or the like pulleys

Definitions

  • the present invention relates to a tool to be mounted on a press and intended for forming a pulley blank, the latter comprising a flange on which a cylindrical rim of revolution is connected around an axis of symmetry.
  • the invention relates more particularly to a tool to be used for manufacturing a pulley with multiple grooves, a manufacturing method using this tool and the pulley thus obtained.
  • Multi-grooved pulleys are used in belt transmission systems of motor vehicles, for example to couple the crankshaft and the alternator in rotation, and they are advantageously equipped with a vibration damping device, constituted for example by a crown lead inertia coupled to the pulley through a thickness of elastomeric material.
  • the present invention provides a new manufacturing process, making it possible to obtain, from a pulley blank, by the use of a special tool to be mounted on a press, a pulley which is both light and of reduced bulk. .
  • the present invention also relates to the special tool used by this process, and the pulley obtained by this process.
  • the die bottom is guided in sliding along said axis of symmetry between an end of travel position where it abuts against a support integral with a movable part of the press, and a start of travel position in which it is recalled by first return means and in which it abuts against a shoulder of the die, the latter being slidably mounted along said axis of symmetry between a limit position in which it abuts against said support, and a race start position in which it is recalled by second return means.
  • the punch is guided in sliding along the axis of symmetry between an end of stroke position in which it rests against a sole secured to a fixed part of the press, and a start of stroke position in which it is recalled. by third return means and in which it abuts against a shoulder of a retaining part fixed on the sole.
  • the punch is slidably mounted on a symmetrical guide pin of revolution around said axis of symmetry, and the bottom of the die has a bore capable of receiving this guide pin during operation of the press.
  • the present invention also relates to a pulley obtained in accordance with the method according to the invention.
  • the method and the tool according to the invention make it possible to manufacture from a stamped sheet metal pulleys without a loop, light.
  • the rim of the pulley is strong enough so that after the grooves have been formed, a vibration damping device, consisting of a ring on the radially internal periphery, can be forced into the pulley in contact with the radially internal surface of the rim. from which adheres, by means of a layer of viscoelastic material, a crown of inertia.
  • the invention thus makes it possible to produce a pulley with multiple grooves of reduced bulk, comprising a symmetrical rim of revolution and a metal flange, the rim connecting perpendicularly to the flange and having, at the connection, an external surface generally at right angle, the pulley being provided internally with a vibration damping device force fitted into the rim.
  • a tool 1 comprising a lower part 2 to be mounted in a manner known per se on a fixed table of a single-acting press (known in it- same and not shown) and an upper part 3 to be fixed under a movable part, called a slide, of the press (also known in itself and not shown), capable of being controlled vertically in approach or away from the table.
  • the lower part 2 of the tool 1 comprises a fixing sole 90 having a flat and horizontal lower surface 91, intended to rest on the table of the press.
  • the fixing sole 90 is provided on its upper surface 92, flat and parallel to the lower surface 91, with a retaining plate 120 whose role will be explained below.
  • a punch 10, the upper front face of which bears the reference 14, is slidably mounted in a counterbore 121 of the retaining part 120.
  • the punch 10 is bored in its center at 15 for the passage of a guide pin 100 anchored lower in the sole 90 and projecting at its upper end above the upper front face 14.
  • a pulley blank P drawn from stamping is attached to the upper front face 14, as will be explained below.
  • This pulley blank P has a hub M threaded on the spindle 100 and extended radially outward by a flange F and a cylindrical rim J of revolution around an axis of symmetry X, connecting to one side of the flange F.
  • the punch 10 has a radially external surface 11 cylindrical of revolution around the axis X, at the base of which projects a flange 17 axially retained in the counterbore 121.
  • the punch 10 is slidably mounted along the axis X on the guide pin 100 between a start of travel position, shown in Figure 4A, in which the flange 17 abuts by a shoulder 12 in the bottom 13 of the countersink 121 and an end of travel position, shown in FIG. 1, in which the lower front face 18 of the punch 10 rests against the upper surface 92 of the sole 90.
  • the punch 10 is normally recalled when the tool 1 is at rest, in its position at the start of the race by return means constituted in the embodiment described by six springs 80 with axes parallel to the axis X, angularly distributed around it.
  • the springs 80 are housed below in counterbores 93 of the sole 90, opening onto the upper surface 92.
  • Bores 93a, opening onto the lower surface 91 and into the bottom of the counterbores 93 are provided to facilitate the machining of the counterbores 93 and allow the air trapped between the lower front face 18 of the punch 10 and the upper surface 92 of the sole 90 to escape during the downward movement of the punch 10.
  • the springs 80 are applied at their upper end in the bottom of bores 18a open on the lower front face 18 of the punch 10, and working in compression to urge the punch 10 in upward movement, until the collar 17 stops against the bottom 13 of the countersink 121, as shown in Figures 4A and 4B.
  • the retaining piece 120 and the sole 90 have, in top view, an identical outline of generally rectangular shape comprising, as shown in FIG. 3, on each lateral edge, two notches 130 for the passage of fastening elements of the retaining part 120 and sole 90 on the press table, known in themselves and not shown.
  • the sole 90 and the retaining piece 120 are precisely positioned one on the other by the introduction of positioning pins 150 into respective bores 99 and 124 of the sole 90 and of the retaining piece 120, of axes parallel to the X axis and located in line with one another.
  • the retaining part 120 comprises four counterbores 125 each arranged in the vicinity of a corner thereof and the sole 90 comprises four threads 94 extending downward these counterbores 125, to receive the thread of bolts 160 coming to bear axially by their head 161 in the bottom of the counterbores 125, and intended to secure the retaining part 120 and the sole 90.
  • An extraction crown 30 is slidably mounted along the axis X on the part of the punch 10 extending outside of the retaining piece 120.
  • the extraction crown 30 is delimited axially, along the axis X, by two front faces which are flat and parallel to each other and perpendicular to the axis X. It is delimited radially, on the outside, by a cylindrical surface 31 of revolution around the axis X, at the base of which a flange 32 projects, and it is delimited radially inside by a radially internal surface 33 cylindrical of revolution around the axis X, fitting closely on the cylindrical surface 11 of the punch 10.
  • the extraction crown 30 is retained axially the punch 10 by a lower retaining ring 170 attached to the retaining piece 120, and having a radially internal surface 171 shouldered, symmetrical of revolution about the axis X.
  • the extraction crown 30 is retained axially, lor s of its upward movement, by abutment of the collar 32 against a shoulder 173 of the radially internal surface 171.
  • the lower retaining ring 170 comprises six countersinks 175 angularly distributed around the axis X, in the bottom of which axially bear the shoulders of bolt 180 fixing heads, screwed into threads 126 of the retaining piece 120 extending towards the down the counterbores 175.
  • the lower retaining ring 170 also comprises two bores 177, extended downwards by bores 128 of the retaining part 120 and by bores 96 in the sole 90. Positioning pins 190 are inserted in the bores 177 and 128 to precisely position the lower retaining ring 170 on the retaining part 120.
  • the extraction crown 30 is able to slide on the punch 10 between a retracted position, in which it rests by its lower front face on the upper surface 120a of the retaining piece 120, and a position for extracting the blank. of pulley P.
  • the extraction crown 30 is moved axially under the action of four candles 200 angularly distributed around the axis X. These candles 200 are able to be applied by their upper front face against the lower front face of the extraction crown 30, to each exert a thrust K thereon.
  • the candles 200 are mounted, at their lower end, on a spring device known in itself and not shown, constituted for example by a hydraulic or pneumatic cylinder.
  • the candles 200 pass through the sole 90 and the retaining part 120 by means of respective bores 98 and 129 of the latter, to lift the extraction crown 30 and eject the blank of the pulley P when the upper 3 and lower 2 parts of the tool 1 are spaced from one another, as will be specified in the after.
  • the punch 10 is traversed along its length by four channels 10a of axes parallel to the axis X and equally distributed around the latter. These channels 10a open at their upper end on the upper front face 14 of the punch 10 and at their lower end in radial grooves 10b formed on the lower front face 18 of the punch 10, opening at the periphery of the latter.
  • the channels 10a and the grooves 10b allow the air trapped between the pulley blank P and the upper front face 14 of the punch 10 to escape when the punch 10 engages in the interior volume of the blank and comes apply to the flange F.
  • the upper part 3 of the tool 1 comprises a support 50 attached by its upper face 50a, flat and horizontal, under a movable part of the press, known in itself and not shown.
  • a matrix base 20 the lower front face of which has a peripheral annular surface perpendicular to the axis X and bearing the reference 21, is mounted to slide along the axis X under the support 50.
  • This matrix base 20 is delimited radially by an external cylindrical surface 23 of revolution about the axis X, at the upper end of which projects a flange 24.
  • the bottom of the matrix 20 is delimited axially at its upper part by an upper front face 25 which is flat and perpendicular to the X axis.
  • the bottom of the die 20 is bored at its lower part along the X axis to define a housing 26, opening on its lower front face and intended to receive the upper end 110 of the guide pin 100 when the moving part of the press, therefore the upper part 3 of the tool 1, is lowered towards the lower part 2.
  • a die 40 is slidably mounted along the axis X on the bottom of the die 20. It has a radially internal stepped surface, comprising a lower portion 41 and an upper portion 41a, both cylindrical of revolution around the axis X and delimited axially by a shoulder 42 perpendicular to the axis X.
  • the lower portion 41 fits tightly on the cylindrical surface 23 of the die bottom 20.
  • the die 40 has a radially outer surface 47 cylindrical of revolution around the axis X, at the upper end of which a flange 48 projects.
  • the matrix 40 is retained axially under the support 50 by an upper retaining ring 210 attached to the lower face 51, flat and horizontal, of the support 50.
  • the upper retaining ring 210 has a radially internal stepped surface, comprising a lower portion 211 and an upper portion 212, both cylindrical of revolution around the axis X, delimited axially by a shoulder 213 perpendicular to the axis X.
  • the flange 48 of the matrix 40 is retained axially under the support 50 by the lower face 51 and the shoulder 213.
  • the upper retaining ring 210 comprises eight counterbores 216 distributed equally around the axis X, in the bottom of which are supported bolt heads 250 screwed into threads 52 of the support 50, extending upward the counterbores 216, intended to maintain the upper retaining ring 210 against the lower face 51 of the support 50.
  • the upper retaining ring 210 is precisely positioned under the support 50 by the engagement of two positioning pins 300 in bores 217 of the ring 210 and in bores 53 of the support 50 surmounting them. These bores 53 are extended above by threads 54 intended for fixing, by bolting, the support 50 under the movable part of the press.
  • the support 50 also comprises, centered on the axis X, a thread 55 intended to receive a fixing bolt for the support 50 under the movable part of the press.
  • the support 50 has a generally rectangular shape, with a contour identical to that of the sole 90 and of the retaining piece 120, and it is provided on its two lateral edges with notches 310, situated directly above the notches 130 of the lower part 2 of the tool 1, intended for the passage of fastening elements of the support 50 on the movable part of the press, known in themselves and not shown.
  • pins 320 are screwed, at their upper part, into threads 218 opening onto the lower front face of the retaining ring 210. These pins 320 are capable of engaging, when the upper part 3 of the tool 1 is lowered during operation of the press, in the bores 330 and 340 of the retaining piece 120 and the sole 90 to push down the candles 350, as will be explained below.
  • the bottom of the die 20 is slidably mounted along the axis X between a limit position where it abuts by its upper front face 25 against the lower face 51 of the support 50, as shown in FIG. 1, and a position at the start of the race, shown in FIG. 4A, in which the flange 24 abuts against the shoulder 42 of the die 40.
  • the bottom of the die 20 is brought back down into this end of travel position by means return constituted, in the embodiment described, by six springs 60, parallel to the axis X and evenly distributed angularly around the latter.
  • the springs 60 are housed above in countersinks 56 of the support 50 and are applied at their lower end in the bottom of bores 27 formed on the upper front face 25 of the matrix bottom 20.
  • the springs 60 work in compression and stress the matrix bottom 20 moving downward away from the support 50.
  • the die 40 is slidably mounted along the axis X between an end of travel position where it abuts by its upper front face 46 against the lower face 51 of the support 50, as shown in Figure 1, and a start position stroke in which it abuts by the flange 48 against the shoulder 213 of the upper retaining ring 210.
  • the die 40 is returned to this position of start of stroke by return means constituted in the embodiment described by eight springs 70 of axes parallel to the axis X and angularly distributed around it.
  • These springs 70 are engaged above in countersinks 57 of the support 50 and are applied at their lower end in the bottom of bores 49 formed on the upper front face 46 of the matrix 40.
  • the springs 70 work in compression and stress the matrix 40 moving down.
  • Four radial grooves are provided on the upper front face 46 of the matrix 40 and the upper front face of the upper retaining ring 210 to allow the air trapped between the base of the matrix 20, the matrix 40 and the support 50 of s ''
  • the axial length of the die bottom 20 is chosen so that, when the lower 2 and upper 3 parts of the tool 1 are initially spaced apart, and the flange 24 axially abuts against the shoulder 42 of the die 40 under the action of the springs 60, the plane of the annular surface 21 of the bottom of the matrix 20 is located under the lower front face 40a of the matrix 40.
  • the matrix 40 comes, in this initial position of the lower 2 and upper 3 parts of the tool 1, into abutment by the flange 48 against the shoulder 213 of the upper retaining ring 210 under the action of the springs 70.
  • the part upper 3 of the tool 1 is sufficiently spaced from the lower part 2 so that the lower front face of the die bottom 20 is located above the upper end of the guide pin 100, and allows engagement on that -this of the pulley blank P, the free edge B of the rim J being directed downwards and coming to rest on the upper front face 30a of the extraction crown 30.
  • the punch 10 is recalled upwards, under the action of the springs 80, up to the stop of the flange 17 in the bottom of the countersink 121.
  • the length of the punch 10 is chosen so that, in the initial position of the tool 1, the flat surface and perpendicular to the X axis of the upper front face 1 4 of the punch 10 protrudes slightly above the upper front surface 30a of the extraction crown 30 situated directly above the annular surface 21.
  • the diameter of the surface 41 is chosen to be greater than the diameter of the surface 11 so as to provide an annular space R when the die 40 is lowered on the punch 10, as shown in FIG. 4B and as will be explained below. .
  • the width of this annular space R is greater than the initial thickness e of the rim J of the pulley blank P, before the operation of the tool 1 and the compaction thereof.
  • the initial distance between the plane containing the free edge B of the rim J and the plane of the surface of the flange F to which the rim J is connected is indicated by b, that is to say the plane of the surface of the flange coming to rest on the upper front face 14 of the punch 10.
  • the diameter of the lower front surface of the die bottom 20 corresponds to the diameter of the radially outer surface of the rim J so that, when the die 40 is lowered on the rim J, the radially internal surface 41 of the die 40 covers the radially external cylindrical surface of the rim J.
  • the upper front face 14 of the punch 10 is connected to the cylindrical surface 11 by a rounding whose radius of curvature, of value r ′, is less than the initial radius of curvature r of the roundness joining the radially internal cylindrical surface of the rim J and the surface of the flange F to which it is connected, before tamping.
  • the radius r ' is chosen to be less than or equal to 1 mm.
  • the operation of the tool 1 is as follows.
  • the movable part of the press is lowered according to arrow A in FIG. 4A in the direction of the press table.
  • the lower front face of the die bottom 20 then comes into contact with the upper surface of the flange F.
  • the upper part 3 of the tool 1 descends further, the lower ends of the pins 320 press on the upper ends of the candles 350 to drag them down.
  • the displacement of the candles 350 downward is accompanied by the simultaneous displacement of the candles 200 and therefore of the sliding downwards of the extraction crown 30 supported by the latter.
  • the pulley blank P then engages gradually on the punch 10, under the effect of the pressure exerted downwards by the die bottom 20, until the flange F rests on the upper front face 14 of the punch 10.
  • the further downward movement of the movable part of the press is accompanied by a depression of the bottom of the die 20 in the die 40, until the latter comes into abutment by its upper front face 25 against the underside 51 of the support.
  • the matrix 40 covers the rim J and is applied, by its lower front face 40a, to the upper front face 30a of the extraction crown 30.
  • the new length along the axis X of the rim being equal to b '.
  • the packing of the rim J is accompanied by an increase in its thickness which reaches a value e 'equal to the radial width of the annular space R.
  • the punch 10 is shown coming into abutment, at term of tamping, by its lower front face 18 against the upper surface 92 of the sole 90. In practice, it is preferred that at the end of the race the lower front face 18 of the punch 10 leaves a residual clearance with the upper surface of the sole 90.
  • the upper part 3 of the tool 1 is then raised, the pins 320 stop pressing on the jack stands 350 which go up and the jack stands 200 move the extraction crown 30 upwards to eject the draft pulley P of punch 10.
  • FIGS. 5A to 5F have summarized, schematically, the different stages of a method for manufacturing a pulley with multiple grooves, using a tool 1 according to the invention.
  • the bell-shaped pulley blank is then leveled off on its free edge (FIG. 5C) in order to eliminate the height irregularities due to stamping, then we proceed (FIG. 5D) to turn the bottom E of the blank to form a flange F.
  • the rim J is connected to an annular portion of the flange F extending perpendicular to the axis of symmetry of the pulley. More particularly, the radially internal surface of the rim J is connected to the inner side of this annular flange portion by a rounded radius of curvature r.
  • the pulley blank is then placed on the tool 1 and the rim J compacted. On leaving the tool 1 (FIG.
  • the rim J has a thickness e ′ greater than e and constant along the axis X, the rim J connecting, on the inside of the annular portion of the flange F, by a rounded radius r 'less than r, r' advantageously being less than or equal to 1 mm, and on the outside of the annular portion of the flange, by a right angle.
  • FIG. 6 shows a pulley obtained in accordance with the above method and equipped with a vibration damping device 500.
  • This pulley comprises a flange F onto which a hub 510 is welded, for its attachment to a crankshaft for example.
  • the flange may have lightening holes in a manner known per se.
  • the pulley has a rim J on the radially external surface of which a series of n grooves G1, ..., G n-1 , G n , n have been formed by flow-turning, in the example described.
  • the extreme grooves G1 and G n are bordered externally by annular extensions each having a recess T, surmounted by a projecting edge V.
  • This projecting edge V optional, makes it possible to avoid an axial overflow of the belt in the event of jumps of this last.
  • the tool 1 according to the invention thanks to the right angle formed between the surfaces 21 and 41 when the die 40 is lowered on the punch 10, makes it possible to obtain, from the initial rounding by which the surface radially outer of the rim J is connected to the flange F, an outer surface generally at right angles bearing the reference W in FIG. 4C.
  • This surface generally at a right angle, guarantees a sufficient thickness of material for subsequently making grooves by flow-turning.
  • the vibration damping device 500 consists of a ring of inertia 501 coaxial with the axis of symmetry of the pulley, bonded by its radially external surface, by means of a layer of viscoelastic material 502, for example an adhered elastomer, on the radially internal surface of a mounting ring 503.
  • the latter is forcibly inserted into the pulley and is applied against the radially internal surface of the rim J.
  • This force insertion is made possible by forming, by means of tool 1, of the rim J, which makes it possible to obtain in the hollow of the groove G1, in N, a sufficient thickness of material (equal to 2.2 mm in the example described), so that the rim I resist this forceful insertion.
  • the invention makes it possible to produce pulleys with multiple grooves which are particularly light and robust, since it is possible, for example, to thicken a sheet by tamping, at the rim, without weakening the latter to a value thicker than 3 mm.
  • the invention is not limited to the forms of pulleys shown in the drawings.
  • Other configurations of the vibration damping device, of the flange, of the hub and of the rim can be proposed.
  • We will adapt in each case the geometry of the bottom front face of the bottom of die and of the upper front face of the punch to the shape of the pulley considered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Pulleys (AREA)

Abstract

A tool (1) is claimed for mounting on a press and designed for forming a pulley blank (P) made up of a rim (J) completely cylindrical around a symmetrical axis (X) and a wheel disc (F). The tool comprises a punch (10) and a die bottom (20) able to be applied on the two opposite respective faces of the wheel disc. The punch has an outer radial surface (11) that is completely cylindrical around the symmetrical axis (X) situated at the inner radial side of the rim (J). An extraction ring (30) is mounted to slide on the punch (10), being able to come into contact with the free edge of the rim (J). A die (40) is mounted to slide on the die bottom (20) and has an inner radial surface (41) that is completely cylindrical around the symmetrical axis (X), able to cover the rim (J) and forming thus with the punch (10) an annular space with a width greater than the initial thickness of the rim (J). The method of using this tool in the fabrication of a multiple grooved pulley and the pulleys thus produced are also claimed. <IMAGE>

Description

La présente invention concerne un outil à monter sur une presse et destiné au formage d'une ébauche de poulie, celle-ci comprenant un flasque sur lequel se raccorde une jante cylindrique de révolution autour d'un axe de symétrie. L'invention concerne plus particulièrement un outil à utiliser pour fabriquer une poulie à gorges multiples, un procédé de fabrication mettant en oeuvre cet outil et la poulie ainsi obtenue.The present invention relates to a tool to be mounted on a press and intended for forming a pulley blank, the latter comprising a flange on which a cylindrical rim of revolution is connected around an axis of symmetry. The invention relates more particularly to a tool to be used for manufacturing a pulley with multiple grooves, a manufacturing method using this tool and the pulley thus obtained.

Les poulies à gorges multiples sont utilisées dans les systèmes de transmission par courroie des véhicules automobiles, par exemple pour accoupler en rotation le vilebrequin et l'alternateur, et elles sont avantageusement équipées d'un dispositif amortisseur de vibrations, constitué par exemple par une couronne d'inertie en plomb accouplée à la poulie par l'intermédiaire d'une épaisseur de matériau élastomère.Multi-grooved pulleys are used in belt transmission systems of motor vehicles, for example to couple the crankshaft and the alternator in rotation, and they are advantageously equipped with a vibration damping device, constituted for example by a crown lead inertia coupled to the pulley through a thickness of elastomeric material.

On a réalisé des poulies à gorges multiples par moulage en fonte ou par usinage d'une pièce en métal fritté. Les poulies ainsi réalisées présentent l'inconvénient d'être lourdes, car la fragilité des matériaux utilisés doit être compensée par une épaisseur de matière importante, en particulier au niveau de la jante sur laquelle sont formées les gorges et soumise à des efforts importants.Multiple grooved pulleys were produced by casting in cast iron or by machining a sintered metal part. The pulleys thus produced have the drawback of being heavy, because the fragility of the materials used must be compensated for by a large thickness of material, in particular at the rim on which the grooves are formed and subjected to significant forces.

On a proposé, pour diminuer le poids des poulies, de fabriquer par emboutissage d'une tôle en acier laminé une ébauche de poulie et de réaliser sur cette ébauche par fluotournage les gorges multiples. Pour permettre la formation par fluotournage des gorges tout en conservant une épaisseur de matière suffisante au niveau du raccordement de la jante sur le flasque, celle-ci se raccorde sur ce dernier en formant une boucle concave vers l'intérieur de la jante et faisant saillie hors du plan du flasque du côté opposé à la jante.It has been proposed, in order to reduce the weight of the pulleys, to manufacture by stamping a rolled steel sheet a blank for a pulley and to make multiple grooves on this blank by flow turning. To allow formation by flow turning of the grooves while retaining a sufficient material thickness at the rim connection on the flange, the latter is connected to the latter by forming a concave loop towards the inside of the rim and projecting out of the plane of the flange on the side opposite the rim.

La présente invention propose un nouveau procédé de fabrication, permettant d'obtenir à partir d'une ébauche de poulie, par la mise en oeuvre d'un outil spécial à monter sur une presse, une poulie à la fois légère et d'encombrement réduit.The present invention provides a new manufacturing process, making it possible to obtain, from a pulley blank, by the use of a special tool to be mounted on a press, a pulley which is both light and of reduced bulk. .

La présente invention a également pour objet l'outil spécial mis en oeuvre par ce procédé, et la poulie obtenue par ce procédé.The present invention also relates to the special tool used by this process, and the pulley obtained by this process.

Selon une première caractéristique de l'invention, cet outil comporte :

  • un poinçon et un fond de matrice, aptes à s'appliquer, au moins lors du fonctionnement de la presse, sur les deux faces respectives opposées du flasque, le poinçon présentant une surface radialement externe cylindrique de révolution autour de l'axe de symétrie de l'ébauche de poulie et située du côté radialement interne de la jante,
  • une couronne d'extraction montée à coulissement sur le poinçon, selon ledit axe de symétrie, et apte à s'appliquer sur le bord libre de ladite jante,
  • une matrice montée à coulissement sur le fond de matrice, selon ledit axe de symétrie, présentant une surface radialement interne cylindrique de révolution autour dudit axe de symétrie, apte à couvrir, au moins lors du fonctionnement de la presse, ladite jante, et ménageant alors avec le poinçon un espace annulaire de largeur supérieure à l'épaisseur initiale de la jante, l'un au moins de la couronne d'extraction et du fond de matrice étant entraîné, lors du fonctionnement de la presse, en rapprochement de l'autre, pour tasser axialement la jante entre une surface annulaire du fond de matrice et la couronne d'extraction, de façon à augmenter l'épaisseur de la jante jusqu'à atteindre la valeur de la largeur dudit espace annulaire. L'outil mis en oeuvre par le procédé selon l'invention permet de fabriquer une ébauche de poulie présentant une jante épaissie, d'épaisseur constante et suffisante pour la formation par fluotournage des gorges sans qu'il soit nécessaire de réaliser une boucle telle que précitée, et diminuer ainsi, par l'absence de boucle, l'encombrement de la poulie.
According to a first characteristic of the invention, this tool comprises:
  • a punch and a die bottom, capable of being applied, at least during the operation of the press, on the two respective opposite faces of the flange, the punch having a radially external surface cylindrical of revolution around the axis of symmetry of the pulley blank and located on the radially internal side of the rim,
  • an extraction crown mounted to slide on the punch, along said axis of symmetry, and capable of being applied to the free edge of said rim,
  • a matrix mounted to slide on the bottom of the matrix, along said axis of symmetry, having a radially internal cylindrical surface of revolution around said axis of symmetry, capable of covering, at least during the operation of the press, said rim, and thus providing with the punch an annular space of width greater than the initial thickness of the rim, at least one of the extraction crown and of the die bottom being driven, during the operation of the press, in approach to the other to axially compact the rim between an annular surface of the bottom of the die and the extraction crown, so as to increase the thickness of the rim until reaching the value of the width of said annular space. The tool used by the method according to the invention makes it possible to manufacture a pulley blank having a thickened rim, of constant thickness and sufficient for the formation by flow turning of the grooves without it being necessary to make a loop such as above, and thus reduce, by the absence of a loop, the size of the pulley.

Avantageusement, le fond de matrice est guidé en coulissement selon ledit axe de symétrie entre une position de fin de course où il vient en butée contre un support solidaire d'une partie mobile de la presse, et une position de début de course dans laquelle il est rappelé par des premiers moyens de rappel et dans laquelle il vient en butée contre un épaulement de la matrice, cette dernière étant montée à coulissement selon ledit axe de symétrie entre une position de fin de course dans laquelle elle vient en butée contre ledit support, et une position de début de course dans laquelle elle est rappelée par des deuxièmes moyens de rappel.Advantageously, the die bottom is guided in sliding along said axis of symmetry between an end of travel position where it abuts against a support integral with a movable part of the press, and a start of travel position in which it is recalled by first return means and in which it abuts against a shoulder of the die, the latter being slidably mounted along said axis of symmetry between a limit position in which it abuts against said support, and a race start position in which it is recalled by second return means.

Avantageusement, le poinçon est guidé en coulissement selon l'axe de symétrie entre une position de fin de course dans laquelle il repose contre une semelle solidaire d'une partie fixe de la presse, et une position de début de course dans laquelle il est rappelé par des troisièmes moyens de rappel et dans laquelle il vient en butée contre un épaulement d'une pièce de retenue fixée sur la semelle.Advantageously, the punch is guided in sliding along the axis of symmetry between an end of stroke position in which it rests against a sole secured to a fixed part of the press, and a start of stroke position in which it is recalled. by third return means and in which it abuts against a shoulder of a retaining part fixed on the sole.

Avantageusement, le poinçon est monté à coulissement sur une broche de guidage symétrique de révolution autour dudit axe de symétrie, et le fond de matrice présente un alésage apte à recevoir cette broche de guidage lors du fonctionnement de la presse.Advantageously, the punch is slidably mounted on a symmetrical guide pin of revolution around said axis of symmetry, and the bottom of the die has a bore capable of receiving this guide pin during operation of the press.

Le procédé de l'invention se caractérise en ce qu'il comprend les étapes consistant à :

  • réaliser par emboutissage, à partir d'un flan circulaire, une ébauche de poulie en forme de cloche, présentant une jante cylindrique de révolution autour d'un axe de symétrie,
  • araser le bord libre de ladite jante pour éliminer des irrégularités de longueur dues à l'emboutissage,
  • retourner le fond de l'ébauche en forme de cloche pour former un flasque de poulie sur lequel se raccorde ladite jante,
  • tasser la jante dans un outil conforme à l'invention pour l'épaissir et lui donner une épaisseur constante,
  • réaliser par fluotournage des gorges multiples sur la jante épaissie.
The method of the invention is characterized in that it comprises the steps consisting in:
  • by stamping, using a circular blank, a bell-shaped pulley blank, having a cylindrical rim of revolution around an axis of symmetry,
  • level off the free edge of said rim to eliminate irregularities in length due to stamping,
  • return the bottom of the bell-shaped blank to form a pulley flange to which said rim is connected,
  • compact the rim in a tool according to the invention to thicken it and give it a constant thickness,
  • make by grooving multiple grooves on the thickened rim.

La présente invention a également pour objet une poulie obtenue conformément au procédé selon l'invention. En particulier, le procédé et l'outil selon l'invention permettent de fabriquer à partir d'une tôle mince emboutie des poulies sans boucle, légères. La jante de la poulie est suffisamment résistante pour qu'après la formation des gorges on puisse insérer à force dans la poulie au contact de la surface radialement interne de la jante un dispositif amortisseur de vibrations, constitué d'une bague sur la périphérie radialement interne de laquelle adhère, au moyen d'une couche de matériau viscoélastique, une couronne d'inertie.The present invention also relates to a pulley obtained in accordance with the method according to the invention. In particular, the method and the tool according to the invention make it possible to manufacture from a stamped sheet metal pulleys without a loop, light. The rim of the pulley is strong enough so that after the grooves have been formed, a vibration damping device, consisting of a ring on the radially internal periphery, can be forced into the pulley in contact with the radially internal surface of the rim. from which adheres, by means of a layer of viscoelastic material, a crown of inertia.

L'invention permet ainsi de réaliser une poulie à gorges multiples d'encombrement réduit, comprenant une jante symétrique de révolution et un flasque en tôle, la jante se raccordant perpendiculairement sur le flasque et présentant, au niveau du raccordement, une surface externe généralement à angle droit, la poulie étant munie intérieurement d'un dispositif amortisseur de vibrations emmanché à force dans la jante.The invention thus makes it possible to produce a pulley with multiple grooves of reduced bulk, comprising a symmetrical rim of revolution and a metal flange, the rim connecting perpendicularly to the flange and having, at the connection, an external surface generally at right angle, the pulley being provided internally with a vibration damping device force fitted into the rim.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre, d'un exemple de réalisation non limitatif de l'invention, et à l'examen du dessin annexé sur lequel :

  • la figure 1 est une vue en coupe axiale d'un outil conforme à la présente invention,
  • la figure 2 est une vue de dessus selon la flèche II de la figure 1,
  • la figure 3 est une vue de dessus prise au niveau des repères III-III de la figure 1,
  • la figure 4A est une vue en coupe axiale, partielle, de l'outil représenté sur la figure 1, le poinçon et le fond de matrice étant représentés dans leurs positions respectives de début de course,
  • la figure 4B est une vue analogue à la figure 4A, montrant le fond de matrice dans sa position de fin de course,
  • la figure 4C est une vue analogue aux figures 4A et 4B, montrant le fond de matrice et le poinçon dans leurs positions respectives de fin de course, après tassage de la jante,
  • les figures 5A à 5F illustrent différentes étapes d'un procédé de fabrication d'une poulie à gorges multiples utilisant un outil conforme à l'invention,
  • la figure 6 représente, en coupe axiale, une poulie à gorges multiples obtenue à l'aide d'un outil conforme à l'invention, et équipée d'un dispositif amortisseur de vibrations.
Other characteristics and advantages of the present invention will appear on reading the detailed description which follows, of a non-limiting exemplary embodiment of the invention, and on examining the appended drawing in which:
  • FIG. 1 is a view in axial section of a tool according to the present invention,
  • FIG. 2 is a top view according to arrow II in FIG. 1,
  • FIG. 3 is a top view taken at the marks III-III of FIG. 1,
  • FIG. 4A is a view in partial axial section of the tool shown in FIG. 1, the punch and the bottom of the die being represented in their respective positions at the start of the stroke,
  • FIG. 4B is a view similar to FIG. 4A, showing the bottom of the die in its end-of-travel position,
  • FIG. 4C is a view similar to FIGS. 4A and 4B, showing the bottom of the die and the punch in their respective end-of-travel positions, after compaction of the rim,
  • FIGS. 5A to 5F illustrate different stages of a process for manufacturing a multi-grooved pulley using a tool according to the invention,
  • FIG. 6 represents, in axial section, a pulley with multiple grooves obtained using a tool according to the invention, and equipped with a vibration damping device.

On a représenté sur la figure 1, en coupe axiale schématique, un outil 1 conforme à l'invention, comprenant une partie inférieure 2 à monter de façon connue en soi sur une table fixe d'une presse à simple effet (connue en elle-même et non représentée) et une partie supérieure 3 à fixer sous une partie mobile, appelée coulisseau, de la presse (également connue en elle-même et non représentée), apte à être commandée verticalement en rapprochement ou en éloignement de la table.There is shown in Figure 1, in schematic axial section, a tool 1 according to the invention, comprising a lower part 2 to be mounted in a manner known per se on a fixed table of a single-acting press (known in it- same and not shown) and an upper part 3 to be fixed under a movable part, called a slide, of the press (also known in itself and not shown), capable of being controlled vertically in approach or away from the table.

La partie inférieure 2 de l'outil 1 comporte une semelle de fixation 90 présentant une surface inférieure 91 plane et horizontale, destinée à reposer sur la table de la presse. La semelle de fixation 90 est munie sur sa surface supérieure 92, plane et parallèle à la surface inférieure 91, d'une plaque de retenue 120 dont le rôle sera précisé dans la suite.The lower part 2 of the tool 1 comprises a fixing sole 90 having a flat and horizontal lower surface 91, intended to rest on the table of the press. The fixing sole 90 is provided on its upper surface 92, flat and parallel to the lower surface 91, with a retaining plate 120 whose role will be explained below.

Un poinçon 10, dont la face frontale supérieure porte la référence 14, est monté à coulissement dans un lamage 121 de la pièce de retenue 120. Le poinçon 10 est alésé en son centre en 15 pour le passage d'une broche de guidage 100 ancrée inférieurement dans la semelle 90 et formant saillie à son extrémité supérieure au-dessus de la face frontale supérieure 14. Une ébauche de poulie P venue d'emboutissage est rapportée sur la face frontale supérieure 14, comme cela sera précisé dans la suite. Cette ébauche de poulie P comporte un moyeu M enfilé sur la broche 100 et prolongé radialement vers l'extérieur par un flasque F et une jante J cylindrique de révolution autour d'un axe de symétrie X, se raccordant sur un côté du flasque F. Le poinçon 10 présente une surface radialement externe 11 cylindrique de révolution autour de l'axe X, à la base de laquelle fait saillie une collerette 17 retenue axialement dans le lamage 121.A punch 10, the upper front face of which bears the reference 14, is slidably mounted in a counterbore 121 of the retaining part 120. The punch 10 is bored in its center at 15 for the passage of a guide pin 100 anchored lower in the sole 90 and projecting at its upper end above the upper front face 14. A pulley blank P drawn from stamping is attached to the upper front face 14, as will be explained below. This pulley blank P has a hub M threaded on the spindle 100 and extended radially outward by a flange F and a cylindrical rim J of revolution around an axis of symmetry X, connecting to one side of the flange F. The punch 10 has a radially external surface 11 cylindrical of revolution around the axis X, at the base of which projects a flange 17 axially retained in the counterbore 121.

Le poinçon 10 est monté à coulissement selon l'axe X sur la broche de guidage 100 entre une position de début de course, représentée sur la figure 4A, dans laquelle la collerette 17 vient en butée par un épaulement 12 dans le fond 13 du lamage 121 et une position de fin de course, représentée sur la figure 1, dans laquelle la face frontale inférieure 18 du poinçon 10 repose contre la surface supérieure 92 de la semelle 90. Le poinçon 10 est normalement rappelé, lorsque l'outil 1 est au repos, dans sa position de début de course par des moyens de rappel constitués dans l'exemple de réalisation décrit par six ressorts 80 d'axes parallèles à l'axe X, équirépartis angulairement autour de celui-ci. Les ressorts 80 sont logés inférieurement dans des lamages 93 de la semelle 90, débouchant sur la surface supérieure 92. Des alésages 93a, débouchant sur la surface inférieure 91 et dans le fond des lamages 93 sont prévus pour faciliter l'usinage des lamages 93 et permettre à l'air emprisonné entre la face frontale inférieure 18 du poinçon 10 et la surface supérieure 92 de la semelle 90 de s'échapper lors du mouvement vers le bas du poinçon 10. Les ressorts 80 s'appliquent à leur extrémité supérieure dans le fond d'alésages 18a ouverts sur la face frontale inférieure 18 du poinçon 10, et travaillent en compression pour solliciter le poinçon 10 en déplacement vers le haut, jusqu'à butée de la collerette 17 contre le fond 13 du lamage 121, comme représenté sur les figures 4A et 4B.The punch 10 is slidably mounted along the axis X on the guide pin 100 between a start of travel position, shown in Figure 4A, in which the flange 17 abuts by a shoulder 12 in the bottom 13 of the countersink 121 and an end of travel position, shown in FIG. 1, in which the lower front face 18 of the punch 10 rests against the upper surface 92 of the sole 90. The punch 10 is normally recalled when the tool 1 is at rest, in its position at the start of the race by return means constituted in the embodiment described by six springs 80 with axes parallel to the axis X, angularly distributed around it. The springs 80 are housed below in counterbores 93 of the sole 90, opening onto the upper surface 92. Bores 93a, opening onto the lower surface 91 and into the bottom of the counterbores 93 are provided to facilitate the machining of the counterbores 93 and allow the air trapped between the lower front face 18 of the punch 10 and the upper surface 92 of the sole 90 to escape during the downward movement of the punch 10. The springs 80 are applied at their upper end in the bottom of bores 18a open on the lower front face 18 of the punch 10, and working in compression to urge the punch 10 in upward movement, until the collar 17 stops against the bottom 13 of the countersink 121, as shown in Figures 4A and 4B.

La pièce de retenue 120 et la semelle 90 présentent, en vue de dessus, un contour identique de forme générale rectangulaire comportant, comme représenté sur la figure 3, sur chaque bord latéral, deux encoches 130 pour le passage d'éléments de fixation de la pièce de retenue 120 et de la semelle 90 sur la table de la presse, connus en eux-mêmes et non représentés.The retaining piece 120 and the sole 90 have, in top view, an identical outline of generally rectangular shape comprising, as shown in FIG. 3, on each lateral edge, two notches 130 for the passage of fastening elements of the retaining part 120 and sole 90 on the press table, known in themselves and not shown.

La semelle 90 et la pièce de retenue 120 sont positionnées l'une sur l'autre avec précision par l'introduction de goupilles de positionnement 150 dans des alésages respectifs 99 et 124 de la semelle 90 et de la pièce de retenue 120, d'axes parallèles à l'axe X et situés dans le prolongement l'un de l'autre. La pièce de retenue 120 comporte quatre lamages 125 ménagés chacun au voisinage d'un coin de celle-ci et la semelle 90 comporte quatre taraudages 94 prolongeant vers le bas ces lamages 125, pour recevoir le filetage de boulons 160 venant en appui axialement par leur tête 161 dans le fond des lamages 125, et destinés à solidariser la pièce de retenue 120 et la semelle 90.The sole 90 and the retaining piece 120 are precisely positioned one on the other by the introduction of positioning pins 150 into respective bores 99 and 124 of the sole 90 and of the retaining piece 120, of axes parallel to the X axis and located in line with one another. The retaining part 120 comprises four counterbores 125 each arranged in the vicinity of a corner thereof and the sole 90 comprises four threads 94 extending downward these counterbores 125, to receive the thread of bolts 160 coming to bear axially by their head 161 in the bottom of the counterbores 125, and intended to secure the retaining part 120 and the sole 90.

Une couronne d'extraction 30 est montée à coulissement selon l'axe X sur la partie du poinçon 10 s'étendant hors de la pièce de retenue 120. La couronne d'extraction 30 est délimitée axialement, selon l'axe X, par deux faces frontales planes et parallèles entre elles et perpendiculaires à l'axe X. Elle est délimitée radialement, à l'extérieur, par une surface 31 cylindrique de révolution autour de l'axe X, à la base de laquelle fait saillie une collerette 32, et elle est délimitée radialement à l'intérieur par une surface radialement interne 33 cylindrique de révolution autour de l'axe X, s'ajustant étroitement sur la surface cylindrique 11 du poinçon 10. La couronne d'extraction 30 est retenue axialement le poinçon 10 par une couronne de retenue inférieure 170 rapportée sur la pièce de retenue 120, et présentant une surface radialement interne 171 épaulée, symétrique de révolution autour de l'axe X. La couronne d'extraction 30 est retenue axialement, lors de son déplacement vers le haut, par butée de la collerette 32 contre un épaulement 173 de la surface radialement interne 171.An extraction crown 30 is slidably mounted along the axis X on the part of the punch 10 extending outside of the retaining piece 120. The extraction crown 30 is delimited axially, along the axis X, by two front faces which are flat and parallel to each other and perpendicular to the axis X. It is delimited radially, on the outside, by a cylindrical surface 31 of revolution around the axis X, at the base of which a flange 32 projects, and it is delimited radially inside by a radially internal surface 33 cylindrical of revolution around the axis X, fitting closely on the cylindrical surface 11 of the punch 10. The extraction crown 30 is retained axially the punch 10 by a lower retaining ring 170 attached to the retaining piece 120, and having a radially internal surface 171 shouldered, symmetrical of revolution about the axis X. The extraction crown 30 is retained axially, lor s of its upward movement, by abutment of the collar 32 against a shoulder 173 of the radially internal surface 171.

La couronne de retenue inférieure 170 comporte six lamages 175 équirépartis angulairement autour de l'axe X, dans le fond desquels viennent axialement en appui des têtes épaulées de boulons 180 de fixation, vissés dans des taraudages 126 de la pièce de retenue 120 prolongeant vers le bas les lamages 175. La couronne de retenue inférieure 170 comporte également deux alésages 177, prolongés vers le bas par des alésage 128 de la pièce de retenue 120 et par des alésages 96 de la semelle 90. Des goupilles de positionnement 190 sont insérées dans les alésages 177 et 128 pour positionner précisément la couronne de retenue inférieure 170 sur la pièce de retenue 120.The lower retaining ring 170 comprises six countersinks 175 angularly distributed around the axis X, in the bottom of which axially bear the shoulders of bolt 180 fixing heads, screwed into threads 126 of the retaining piece 120 extending towards the down the counterbores 175. The lower retaining ring 170 also comprises two bores 177, extended downwards by bores 128 of the retaining part 120 and by bores 96 in the sole 90. Positioning pins 190 are inserted in the bores 177 and 128 to precisely position the lower retaining ring 170 on the retaining part 120.

La couronne d'extraction 30 est apte à coulisser sur le poinçon 10 entre une position rétractée, dans laquelle elle repose par sa face frontale inférieure sur la surface supérieure 120a de la pièce de retenue 120, et une position d'extraction de l'ébauche de poulie P. La couronne d'extraction 30 est déplacée axialement sous l'action de quatre chandelles 200 équiréparties angulairement autour de l'axe X. Ces chandelles 200 sont aptes à s'appliquer par leur face frontale supérieure contre la face frontale inférieure de la couronne d'extraction 30, pour exercer chacun une poussée K sur celle-ci. Les chandelles 200 sont montées, à leur extrémité inférieure, sur un dispositif formant ressort connu en lui-même et non représenté, constitué par exemple par un vérin hydraulique ou pneumatique. Les chandelles 200 traversent la semelle 90 et la pièce de retenue 120 à la faveur d'alésages respectifs 98 et 129 de ces dernières, pour soulever la couronne d'extraction 30 et éjecter l'ébauche de la poulie P lorsque les parties supérieure 3 et inférieure 2 de l'outil 1 sont écartées l'une de l'autre, comme cela sera précisé dans la suite.The extraction crown 30 is able to slide on the punch 10 between a retracted position, in which it rests by its lower front face on the upper surface 120a of the retaining piece 120, and a position for extracting the blank. of pulley P. The extraction crown 30 is moved axially under the action of four candles 200 angularly distributed around the axis X. These candles 200 are able to be applied by their upper front face against the lower front face of the extraction crown 30, to each exert a thrust K thereon. The candles 200 are mounted, at their lower end, on a spring device known in itself and not shown, constituted for example by a hydraulic or pneumatic cylinder. The candles 200 pass through the sole 90 and the retaining part 120 by means of respective bores 98 and 129 of the latter, to lift the extraction crown 30 and eject the blank of the pulley P when the upper 3 and lower 2 parts of the tool 1 are spaced from one another, as will be specified in the after.

Le poinçon 10 est traversé sur sa longueur par quatre canaux 10a d'axes parallèles à l'axe X et équirépartis autour de ce dernier. Ces canaux 10a débouchent à leur extrémité supérieure sur la face frontale supérieure 14 du poinçon 10 et à leur extrémité inférieure dans des rainurages radiaux 10b ménagés sur la face frontale inférieure 18 du poinçon 10, débouchant à la périphérie de ce dernier. Les canaux 10a et les rainurages 10b permettent à l'air emprisonné entre l'ébauche de poulie P et la face frontale supérieure 14 du poinçon 10 de s'évacuer lorsque le poinçon 10 s'engage dans le volume intérieur de l'ébauche et vient s'appliquer sur le flasque F.The punch 10 is traversed along its length by four channels 10a of axes parallel to the axis X and equally distributed around the latter. These channels 10a open at their upper end on the upper front face 14 of the punch 10 and at their lower end in radial grooves 10b formed on the lower front face 18 of the punch 10, opening at the periphery of the latter. The channels 10a and the grooves 10b allow the air trapped between the pulley blank P and the upper front face 14 of the punch 10 to escape when the punch 10 engages in the interior volume of the blank and comes apply to the flange F.

Quatre alésages 330 d'axes parallèles à l'axe X et équirépartis autour de ce dernier sont ménagés sur la pièce de retenue 120, à une distance de l'axe X choisie de telle sorte qu'ils se situent radialement immédiatement à l'extérieur de la couronne de retenue inférieure 170. Ces alésages 330 sont prolongés chacun vers le bas par un alésage 340 de même diamètre, traversant la semelle 90. Des chandelles 350, solidaires en déplacement des chandelles 200, sont aptes à se déplacer selon l'axe X dans les alésages 330 et 340. Les chandelles 350 sont entraînées en déplacement vers le bas par des broches 320 fixées sur la partie supérieure 3 de l'outil 1, comme cela sera précisé dans la suite. Les broches 320 exercent chacune une action K' sur les chandelles 350 dirigée vers le bas. Ces dernières exercent sur les broches 320 une force de réaction K dirigée vers le haut.Four bores 330 with axes parallel to the X axis and equally distributed around the latter are provided on the retaining piece 120, at a distance from the X axis chosen so that they are located radially immediately outside. of the lower retaining ring 170. These bores 330 are each extended downwards by a bore 340 of the same diameter, passing through the sole 90. Candles 350, integral with the movement of the candles 200, are able to move along the axis X in the bores 330 and 340. The candles 350 are driven in downward movement by pins 320 fixed on the upper part 3 of the tool 1, as will be explained below. The pins 320 each exert an action K 'on the candles 350 directed downwards. The latter exert an upwardly directed reaction force K on the pins 320.

La partie supérieure 3 de l'outil 1 comprend un support 50 rapporté par sa face supérieure 50a, plane et horizontale, sous une partie mobile de la presse, connue en elle-même et non représentée. Un fond de matrice 20, dont la face frontale inférieure présente une surface annulaire périphérique perpendiculaire à l'axe X et portant la référence 21, est monté à coulissement selon l'axe X sous le support 50. Ce fond de matrice 20 est délimité radialement par une surface externe 23 cylindrique de révolution autour de l'axe X, à l'extrémité supérieure de laquelle fait saillie une collerette 24. Le fond de matrice 20 est délimité axialement à sa partie supérieure par une face frontale supérieure 25 plane et perpendiculaire à l'axe X. Le fond de matrice 20 est alésé à sa partie inférieure selon l'axe X pour définir un logement 26, débouchant sur sa face frontale inférieure et destiné à recevoir l'extrémité supérieure 110 de la broche de guidage 100 lorsque la partie mobile de la presse, donc la partie supérieure 3 de l'outil 1, est descendue vers la partie inférieure 2.The upper part 3 of the tool 1 comprises a support 50 attached by its upper face 50a, flat and horizontal, under a movable part of the press, known in itself and not shown. A matrix base 20, the lower front face of which has a peripheral annular surface perpendicular to the axis X and bearing the reference 21, is mounted to slide along the axis X under the support 50. This matrix base 20 is delimited radially by an external cylindrical surface 23 of revolution about the axis X, at the upper end of which projects a flange 24. The bottom of the matrix 20 is delimited axially at its upper part by an upper front face 25 which is flat and perpendicular to the X axis. The bottom of the die 20 is bored at its lower part along the X axis to define a housing 26, opening on its lower front face and intended to receive the upper end 110 of the guide pin 100 when the moving part of the press, therefore the upper part 3 of the tool 1, is lowered towards the lower part 2.

Une matrice 40 est montée à coulissement selon l'axe X sur le fond de matrice 20. Elle présente une surface radialement interne étagée, comprenant une portion inférieure 41 et une portion supérieure 41a, toutes les deux cylindriques de révolution autour de l'axe X et délimitées axialement par un épaulement 42 perpendiculaire à l'axe X. La portion inférieure 41 s'ajuste étroitement sur la surface cylindrique 23 du fond de matrice 20. La matrice 40 présente une surface radialement externe 47 cylindrique de révolution autour de l'axe X, à l'extrémité supérieure de laquelle fait saillie une collerette 48. La matrice 40 est retenue axialement sous le support 50 par une couronne de retenue supérieure 210 rapportée sur la face inférieure 51, plane et horizontale, du support 50.A die 40 is slidably mounted along the axis X on the bottom of the die 20. It has a radially internal stepped surface, comprising a lower portion 41 and an upper portion 41a, both cylindrical of revolution around the axis X and delimited axially by a shoulder 42 perpendicular to the axis X. The lower portion 41 fits tightly on the cylindrical surface 23 of the die bottom 20. The die 40 has a radially outer surface 47 cylindrical of revolution around the axis X, at the upper end of which a flange 48 projects. The matrix 40 is retained axially under the support 50 by an upper retaining ring 210 attached to the lower face 51, flat and horizontal, of the support 50.

La couronne de retenue supérieure 210 présente une surface radialement interne étagée, comprenant une portion inférieure 211 et une portion supérieure 212, toutes deux cylindriques de révolution autour de l'axe X, délimitées axialement par un épaulement 213 perpendiculaire à l'axe X. La collerette 48 de la matrice 40 est retenue axialement sous le support 50 par la face inférieure 51 et l'épaulement 213.The upper retaining ring 210 has a radially internal stepped surface, comprising a lower portion 211 and an upper portion 212, both cylindrical of revolution around the axis X, delimited axially by a shoulder 213 perpendicular to the axis X. The flange 48 of the matrix 40 is retained axially under the support 50 by the lower face 51 and the shoulder 213.

La couronne de retenue supérieure 210 comporte huit lamages 216 équirépartis autour de l'axe X, dans le fond desquels s'appuient des têtes de boulons 250 vissés dans des taraudages 52 du support 50, prolongeant vers le haut les lamages 216, destinés à maintenir la couronne de retenue supérieure 210 contre la face inférieure 51 du support 50. La couronne de retenue supérieure 210 est positionnée avec précision sous le support 50 par l'engagement de deux goupilles de positionnement 300 dans des alésages 217 de la couronne 210 et dans des alésages 53 du support 50 les surmontant. Ces alésages 53 se prolongent supérieurement par des taraudages 54 destinés à la fixation, par boulonnage, du support 50 sous la partie mobile de la presse. Le support 50 comporte également, centré sur l'axe X, un taraudage 55 destiné à recevoir un boulon de fixation du support 50 sous la partie mobile de la presse. Le support 50 présente une forme généralement rectangulaire, de contour identique à celui de la semelle 90 et de la pièce de retenue 120, et il est muni sur ses deux bords latéraux d'encoches 310, situées à l'aplomb des encoches 130 de la partie inférieure 2 de l'outil 1, destinées au passage d'éléments de fixation du support 50 sur la partie mobile de la presse, connus en eux-mêmes et non représentés.The upper retaining ring 210 comprises eight counterbores 216 distributed equally around the axis X, in the bottom of which are supported bolt heads 250 screwed into threads 52 of the support 50, extending upward the counterbores 216, intended to maintain the upper retaining ring 210 against the lower face 51 of the support 50. The upper retaining ring 210 is precisely positioned under the support 50 by the engagement of two positioning pins 300 in bores 217 of the ring 210 and in bores 53 of the support 50 surmounting them. These bores 53 are extended above by threads 54 intended for fixing, by bolting, the support 50 under the movable part of the press. The support 50 also comprises, centered on the axis X, a thread 55 intended to receive a fixing bolt for the support 50 under the movable part of the press. The support 50 has a generally rectangular shape, with a contour identical to that of the sole 90 and of the retaining piece 120, and it is provided on its two lateral edges with notches 310, situated directly above the notches 130 of the lower part 2 of the tool 1, intended for the passage of fastening elements of the support 50 on the movable part of the press, known in themselves and not shown.

Les broches 320 précitées sont vissées, à leur partie supérieure, dans des taraudages 218 débouchant sur la face frontale inférieure de la couronne de retenue 210. Ces broches 320 sont aptes à s'engager, lorsque la partie supérieure 3 de l'outil 1 est descendue lors du fonctionnement de la presse, dans les alésages 330 et 340 de la pièce de retenue 120 et de la semelle 90 pour repousser vers le bas les chandelles 350, comme cela sera précisé dans la suite.The above-mentioned pins 320 are screwed, at their upper part, into threads 218 opening onto the lower front face of the retaining ring 210. These pins 320 are capable of engaging, when the upper part 3 of the tool 1 is lowered during operation of the press, in the bores 330 and 340 of the retaining piece 120 and the sole 90 to push down the candles 350, as will be explained below.

Le fond de matrice 20 est monté à coulissement selon l'axe X entre une position de fin de course où il vient buter par sa face frontale supérieure 25 contre la face inférieure 51 du support 50, comme représenté sur la figure 1, et une position de début de course, représentée sur la figure 4A, dans lequel la collerette 24 vient en butée contre l'épaulement 42 de la matrice 40. Le fond de la matrice 20 est rappelé vers le bas dans cette position de fin de course par des moyens de rappel constitués, dans l'exemple de réalisation décrit, par six ressorts 60, parallèles à l'axe X et équirépartis angulairement autour de celui-ci. Les ressorts 60 sont logés supérieurement dans des lamages 56 du support 50 et s'appliquent à leur extrémité inférieure dans le fond d'alésages 27 ménagés sur la face frontale supérieure 25 du fond de matrice 20. Les ressorts 60 travaillent en compression et sollicitent le fond de matrice 20 en déplacement vers le bas en éloignement du support 50.The bottom of the die 20 is slidably mounted along the axis X between a limit position where it abuts by its upper front face 25 against the lower face 51 of the support 50, as shown in FIG. 1, and a position at the start of the race, shown in FIG. 4A, in which the flange 24 abuts against the shoulder 42 of the die 40. The bottom of the die 20 is brought back down into this end of travel position by means return constituted, in the embodiment described, by six springs 60, parallel to the axis X and evenly distributed angularly around the latter. The springs 60 are housed above in countersinks 56 of the support 50 and are applied at their lower end in the bottom of bores 27 formed on the upper front face 25 of the matrix bottom 20. The springs 60 work in compression and stress the matrix bottom 20 moving downward away from the support 50.

La matrice 40 est montée à coulissement selon l'axe X entre une position de fin de course où elle vient buter par sa face frontale supérieure 46 contre la face inférieure 51 du support 50, comme représenté sur la figure 1, et une position de début de course dans laquelle elle vient en butée par la collerette 48 contre l'épaulement 213 de la couronne de retenue supérieure 210. La matrice 40 est rappelée dans cette position de début de course par des moyens de rappel constitués dans l'exemple de réalisation décrit par huit ressorts 70 d'axes parallèles à l'axe X et équirépartis angulairement autour de celui-ci. Ces ressorts 70 sont engagés supérieurement dans des lamages 57 du support 50 et s'appliquent à leur extrémité inférieure dans le fond d'alésages 49 ménagés sur la face frontale supérieure 46 de la matrice 40. Les ressorts 70 travaillent en compression et sollicitent la matrice 40 en déplacement vers le bas. Quatre rainures radiales sont ménagées sur la face frontale supérieure 46 de la matrice 40 et la face frontale supérieure de la couronne de retenue supérieure 210 pour permettre à l'air emprisonné entre le fond de matrice 20, la matrice 40 et le support 50 de s'évacuer lors du déplacement de ces derniers.The die 40 is slidably mounted along the axis X between an end of travel position where it abuts by its upper front face 46 against the lower face 51 of the support 50, as shown in Figure 1, and a start position stroke in which it abuts by the flange 48 against the shoulder 213 of the upper retaining ring 210. The die 40 is returned to this position of start of stroke by return means constituted in the embodiment described by eight springs 70 of axes parallel to the axis X and angularly distributed around it. These springs 70 are engaged above in countersinks 57 of the support 50 and are applied at their lower end in the bottom of bores 49 formed on the upper front face 46 of the matrix 40. The springs 70 work in compression and stress the matrix 40 moving down. Four radial grooves are provided on the upper front face 46 of the matrix 40 and the upper front face of the upper retaining ring 210 to allow the air trapped between the base of the matrix 20, the matrix 40 and the support 50 of s '' evacuate when moving them.

La longueur axiale du fond de matrice 20 est choisie de sorte que, lorsque les parties inférieure 2 et supérieure 3 de l'outil 1 sont initialement écartées, et que la collerette 24 vient axialement en butée contre l'épaulement 42 de la matrice 40 sous l'action des ressorts 60, le plan de la surface annulaire 21 du fond de matrice 20 se situe sous la face frontale inférieure 40a de la matrice 40.The axial length of the die bottom 20 is chosen so that, when the lower 2 and upper 3 parts of the tool 1 are initially spaced apart, and the flange 24 axially abuts against the shoulder 42 of the die 40 under the action of the springs 60, the plane of the annular surface 21 of the bottom of the matrix 20 is located under the lower front face 40a of the matrix 40.

La matrice 40 vient, dans cette position initiale des parties inférieure 2 et supérieure 3 de l'outil 1, en butée par la collerette 48 contre l'épaulement 213 de la couronne de retenue supérieure 210 sous l'action des ressorts 70. La partie supérieure 3 de l'outil 1 est suffisamment écartée de la partie inférieure 2 pour que la face frontale inférieure du fond de matrice 20 se situe au-dessus de l'extrémité supérieure de la broche de guidage 100, et permette l'engagement sur celle-ci de l'ébauche de poulie P, le bord libre B de la jante J étant dirigé vers le bas et venant reposer sur la face frontale supérieure 30a de la couronne d'extraction 30. Le poinçon 10 est rappelé vers le haut, sous l'action des ressorts 80, jusqu'à butée de la collerette 17 dans le fond du lamage 121. De préférence, la longueur du poinçon 10 est choisie de sorte que, dans la position initiale de l'outil 1, la surface plane et perpendiculaire à l'axe X de la face frontale supérieure 14 du poinçon 10 fasse légèrement saillie au-dessus de la surface frontale supérieure 30a de la couronne d'extraction 30 située à l'aplomb de la surface annulaire 21.The matrix 40 comes, in this initial position of the lower 2 and upper 3 parts of the tool 1, into abutment by the flange 48 against the shoulder 213 of the upper retaining ring 210 under the action of the springs 70. The part upper 3 of the tool 1 is sufficiently spaced from the lower part 2 so that the lower front face of the die bottom 20 is located above the upper end of the guide pin 100, and allows engagement on that -this of the pulley blank P, the free edge B of the rim J being directed downwards and coming to rest on the upper front face 30a of the extraction crown 30. The punch 10 is recalled upwards, under the action of the springs 80, up to the stop of the flange 17 in the bottom of the countersink 121. Preferably, the length of the punch 10 is chosen so that, in the initial position of the tool 1, the flat surface and perpendicular to the X axis of the upper front face 1 4 of the punch 10 protrudes slightly above the upper front surface 30a of the extraction crown 30 situated directly above the annular surface 21.

Le diamètre de la surface 41 est choisi supérieur au diamètre de la surface 11 de façon à ménager un espace annulaire R lorsque la matrice 40 est descendue sur le poinçon 10, comme cela est représenté sur la figure 4B et comme cela sera précisé dans la suite. La largeur de cet espace annulaire R, de l'ordre de quelques millimètres dans l'exemple de réalisation décrit et de préférence supérieure ou égale à 3 mm, est supérieure à l'épaisseur initiale e de la jante J de l'ébauche de poulie P, avant le fonctionnement de l'outil 1 et le tassage de celle-ci. On a indiqué par b la distance initiale entre le plan contenant le bord libre B de la jante J et le plan de la surface du flasque F sur lequel se raccorde la jante J, c'est-à-dire le plan de la surface du flasque venant reposer sur la face frontale supérieure 14 du poinçon 10. Le diamètre de la surface frontale inférieure du fond de matrice 20 correspond au diamètre de la surface radialement externe de la jante J de sorte que, lorsque la matrice 40 est abaissée sur la jante J, la surface 41 radialement interne de la matrice 40 vient couvrir la surface cylindrique radialement externe de la jante J.The diameter of the surface 41 is chosen to be greater than the diameter of the surface 11 so as to provide an annular space R when the die 40 is lowered on the punch 10, as shown in FIG. 4B and as will be explained below. . The width of this annular space R, of the order of a few millimeters in the embodiment described and preferably greater than or equal to 3 mm, is greater than the initial thickness e of the rim J of the pulley blank P, before the operation of the tool 1 and the compaction thereof. The initial distance between the plane containing the free edge B of the rim J and the plane of the surface of the flange F to which the rim J is connected is indicated by b, that is to say the plane of the surface of the flange coming to rest on the upper front face 14 of the punch 10. The diameter of the lower front surface of the die bottom 20 corresponds to the diameter of the radially outer surface of the rim J so that, when the die 40 is lowered on the rim J, the radially internal surface 41 of the die 40 covers the radially external cylindrical surface of the rim J.

La face frontale supérieure 14 du poinçon 10 se raccorde sur la surface cylindrique 11 par un arrondi dont le rayon de courbure, de valeur r', est inférieur au rayon de courbure initial r de l'arrondi joignant la surface cylindrique radialement interne de la jante J et la surface du flasque F sur laquelle elle se raccorde, avant tassage. De préférence, le rayon r' est choisi inférieur ou égal à 1 mm.The upper front face 14 of the punch 10 is connected to the cylindrical surface 11 by a rounding whose radius of curvature, of value r ′, is less than the initial radius of curvature r of the roundness joining the radially internal cylindrical surface of the rim J and the surface of the flange F to which it is connected, before tamping. Preferably, the radius r 'is chosen to be less than or equal to 1 mm.

Le fonctionnement de l'outil 1 est le suivant.The operation of the tool 1 is as follows.

Après mise en place de l'ébauche de poulie P sur la broche de guidage 100 avec appui sur la face 30a de la couronne d'extraction, la partie mobile de la presse est descendue selon la flèche A de la figure 4A en direction de la table de la presse. La face frontale inférieure du fond de matrice 20 vient alors au contact de la surface supérieure du flasque F. Ensuite, tandis que la partie supérieure 3 de l'outil 1 descend davantage, les extrémités inférieures des broches 320 appuient sur les extrémités supérieures des chandelles 350 pour les entrainer vers le bas. Le déplacement des chandelles 350 vers le bas s'accompagne du déplacement simultané des chandelles 200 et donc du coulissement vers le bas de la couronne d'extraction 30 soutenue par ces dernières. L'ébauche de poulie P s'engage alors progressivement sur le poinçon 10, sous l'effet de la pression exercée vers le bas par le fond de matrice 20, jusqu'à ce que le flasque F repose sur la face frontale supérieure 14 du poinçon 10. La poursuite du déplacement vers le bas de la partie mobile de la presse s'accompagne d'un enfoncement du fond de la matrice 20 dans la matrice 40, jusqu'à ce que ce dernier vienne en butée par sa face frontale supérieure 25 contre la face inférieure 51 du support. La matrice 40 vient couvrir la jante J et s'appliquer, par sa face frontale inférieure 40a, sur la face frontale supérieure 30a de la couronne d'extraction 30. Cette dernière, qui cesse d'être soutenue par les chandelles 200 rappelées vers le bas sous l'action des broches 320, vient en butée par sa face frontale inférieure 39 contre la surface supérieure 120a de la pièce de retenue 120, pour atteindre la position représentée sur la figure 4B, dans laquelle l'ébauche de poulie P est fermement maintenue entre la face frontale supérieure 14 du poinçon 10 et la surface annulaire 21 du fond de matrice 20. Le support 50 continue à être entraîné vers le bas par rapport à la position représentée sur cette figure pour tasser la jante J entre la surface 21 du fond de matrice 20 et la face frontale supérieure 30a de la couronne d'extraction 30, sur laquelle repose le bord libre de la poulie. Lors de cette action de tassage, le poinçon 10 se déplace vers le bas de la distance b - b', comme représenté sur la figure 4C, la nouvelle longueur suivant l'axe X de la jante valant b'. Le tassement de la jante J s'accompagne d'une augmentation de son épaisseur qui atteint une valeur e' égale à la largeur radiale de l'espace annulaire R. Dans l'exemple décrit, le poinçon 10 est représenté venant en butée, au terme du tassage, par sa face frontale inférieure 18 contre la surface supérieure 92 de la semelle 90. Dans la pratique, on préfère qu'en fin de course la face frontale inférieure 18 du poinçon 10 ménage un jeu résiduel avec la surface supérieure de la semelle 90. La partie supérieure 3 de l'outil 1 est ensuite relevée, les broches 320 cessent d'appuyer sur les chandelles 350 qui remontent et les chandelles 200 déplacent la couronne d'extraction 30 vers le haut pour éjecter l'ébauche de poulie P du poinçon 10.After the pulley blank P has been placed on the guide pin 100 with support on the face 30a of the extraction crown, the movable part of the press is lowered according to arrow A in FIG. 4A in the direction of the press table. The lower front face of the die bottom 20 then comes into contact with the upper surface of the flange F. Then, while the upper part 3 of the tool 1 descends further, the lower ends of the pins 320 press on the upper ends of the candles 350 to drag them down. The displacement of the candles 350 downward is accompanied by the simultaneous displacement of the candles 200 and therefore of the sliding downwards of the extraction crown 30 supported by the latter. The pulley blank P then engages gradually on the punch 10, under the effect of the pressure exerted downwards by the die bottom 20, until the flange F rests on the upper front face 14 of the punch 10. The further downward movement of the movable part of the press is accompanied by a depression of the bottom of the die 20 in the die 40, until the latter comes into abutment by its upper front face 25 against the underside 51 of the support. The matrix 40 covers the rim J and is applied, by its lower front face 40a, to the upper front face 30a of the extraction crown 30. The latter, which ceases to be supported by the candles 200 recalled towards the bottom under the action of pins 320, abuts by its lower front face 39 against the upper surface 120a of the retaining piece 120, to reach the position shown in FIG. 4B, in which the pulley blank P is firmly held between the upper front face 14 of the punch 10 and the annular surface 21 of the die bottom 20. The support 50 continues to be driven downward relative to the position shown in this figure to compact the rim J between the surface 21 of the matrix bottom 20 and the upper front face 30a of the extraction crown 30, on which the free edge of the pulley rests. During this tamping action, the punch 10 moves down the distance b - b ', as shown in FIG. 4C, the new length along the axis X of the rim being equal to b '. The packing of the rim J is accompanied by an increase in its thickness which reaches a value e 'equal to the radial width of the annular space R. In the example described, the punch 10 is shown coming into abutment, at term of tamping, by its lower front face 18 against the upper surface 92 of the sole 90. In practice, it is preferred that at the end of the race the lower front face 18 of the punch 10 leaves a residual clearance with the upper surface of the sole 90. The upper part 3 of the tool 1 is then raised, the pins 320 stop pressing on the jack stands 350 which go up and the jack stands 200 move the extraction crown 30 upwards to eject the draft pulley P of punch 10.

On a récapitulé sur les figures 5A à 5F, de façon schématique, les différentes étapes d'un procédé de fabrication d'une poulie à gorges multiples, utilisant un outil 1 conforme à l'invention.FIGS. 5A to 5F have summarized, schematically, the different stages of a method for manufacturing a pulley with multiple grooves, using a tool 1 according to the invention.

On commence par réaliser par emboutissage, à partir d'un flan circulaire D constitué par une tôle mince (figure 5A), une ébauche de poulie en forme de cloche qui est laminée afin d'obtenir une jante J d'épaisseur constante e (figure 5B).We start by stamping, from a circular blank D made of a thin sheet (Figure 5A), a bell-shaped pulley blank which is laminated to obtain a rim J of constant thickness e (Figure 5B).

L'ébauche de poulie en forme de cloche est ensuite arasée sur son bord libre (figure 5C) pour éliminer les irrégularités de hauteur dues à l'emboutissage, puis on procède (figure 5D) à un retournement du fond E de l'ébauche pour former un flasque F. La jante J se raccorde sur une portion annulaire du flasque F s'étendant perpendiculairement à l'axe de symétrie de la poulie. Plus particulièrement, la surface radialement interne de la jante J se raccorde sur le côté intérieur de cette portion annulaire de flasque par un arrondi de rayon de courbure r. L'ébauche de poulie est ensuite placée sur l'outil 1 et la jante J tassée. A sa sortie de l'outil 1 (figure 5E), la jante J présente une épaisseur e' supérieure à e et constante selon l'axe X, la jante J se raccordant, sur le côté intérieur de la portion annulaire du flasque F, par un arrondi de rayon r' inférieur à r, r' étant avantageusement inférieur ou égal à 1 mm, et sur le côté extérieur de la portion annulaire du flasque, par un angle droit.The bell-shaped pulley blank is then leveled off on its free edge (FIG. 5C) in order to eliminate the height irregularities due to stamping, then we proceed (FIG. 5D) to turn the bottom E of the blank to form a flange F. The rim J is connected to an annular portion of the flange F extending perpendicular to the axis of symmetry of the pulley. More particularly, the radially internal surface of the rim J is connected to the inner side of this annular flange portion by a rounded radius of curvature r. The pulley blank is then placed on the tool 1 and the rim J compacted. On leaving the tool 1 (FIG. 5E), the rim J has a thickness e ′ greater than e and constant along the axis X, the rim J connecting, on the inside of the annular portion of the flange F, by a rounded radius r 'less than r, r' advantageously being less than or equal to 1 mm, and on the outside of the annular portion of the flange, by a right angle.

Des gorges multiples sont ensuite formées sur la surface radialement externe de la jante J par fluotournage, de façon connue en soi.Multiple grooves are then formed on the radially outer surface of the rim J by flow spinning, in a manner known per se.

On a représenté sur la figure 6 une poulie obtenue conformément au procédé précité et équipée d'un dispositif amortisseur de vibrations 500.FIG. 6 shows a pulley obtained in accordance with the above method and equipped with a vibration damping device 500.

Cette poulie comporte un flasque F sur lequel est soudé un moyeu 510, pour sa fixation sur un arbre de vilebrequin par exemple. Le flasque peut présenter des trous d'allègement de façon connue en soi.This pulley comprises a flange F onto which a hub 510 is welded, for its attachment to a crankshaft for example. The flange may have lightening holes in a manner known per se.

La poulie comporte une jante J sur la surface radialement externe de laquelle ont été formées par fluotournage une série de n gorges G₁, ..., Gn-1, Gn, n étant égal à 6 dans l'exemple décrit. Les gorges extrêmes G₁ et Gn sont bordées extérieurement par des extensions annulaires présentant chacune un décrochement T, surmonté par une arête saillante V. Cette arête saillante V, facultative, permet d'éviter un débordement axial de la courroie en cas de sauts de cette dernière.The pulley has a rim J on the radially external surface of which a series of n grooves G₁, ..., G n-1 , G n , n have been formed by flow-turning, in the example described. The extreme grooves G₁ and G n are bordered externally by annular extensions each having a recess T, surmounted by a projecting edge V. This projecting edge V, optional, makes it possible to avoid an axial overflow of the belt in the event of jumps of this last.

L'outil 1 selon l'invention, grâce à l'angle droit formé entre les surfaces 21 et 41 lorsque la matrice 40 est descendue sur le poinçon 10, permet d'obtenir, à partir de l'arrondi initial par lequel la surface radialement externe de la jante J se raccorde sur le flasque F, une surface externe généralement à angle droit portant la référence W sur la figure 4C. Cette surface généralement à angle droit garantit une épaisseur de matière suffisante pour la réalisation par la suite des gorges par fluotournage.The tool 1 according to the invention, thanks to the right angle formed between the surfaces 21 and 41 when the die 40 is lowered on the punch 10, makes it possible to obtain, from the initial rounding by which the surface radially outer of the rim J is connected to the flange F, an outer surface generally at right angles bearing the reference W in FIG. 4C. This surface, generally at a right angle, guarantees a sufficient thickness of material for subsequently making grooves by flow-turning.

Le dispositif amortisseur de vibrations 500 est constitué par une couronne d'inertie 501 coaxiale à l'axe de symétrie de la poulie, collée par sa surface radialement externe, au moyen d'une couche de matériau viscoélastique 502, par exemple un élastomère adhéré, sur la surface radialement interne d'une bague de montage 503. Cette dernière est insérée à force dans la poulie et vient s'appliquer contre la surface radialement interne de la jante J. Cette insertion à force est rendue possible grâce au formage, au moyen de l'outil 1, de la jante J, qui permet d'obtenir dans le creux de la gorge G₁, en N, une épaisseur de matière suffisante (égale à 2,2 mm dans l'exemple décrit), pour que la jante J résiste à cette insertion en force.The vibration damping device 500 consists of a ring of inertia 501 coaxial with the axis of symmetry of the pulley, bonded by its radially external surface, by means of a layer of viscoelastic material 502, for example an adhered elastomer, on the radially internal surface of a mounting ring 503. The latter is forcibly inserted into the pulley and is applied against the radially internal surface of the rim J. This force insertion is made possible by forming, by means of tool 1, of the rim J, which makes it possible to obtain in the hollow of the groove G₁, in N, a sufficient thickness of material (equal to 2.2 mm in the example described), so that the rim I resist this forceful insertion.

Finalement, l'invention permet de réaliser des poulies à gorges multiples particulièrement légères et robustes, puisqu'il est possible, par exemple, d'épaissir une tôle par tassage, au niveau de la jante, sans fragilisation de celle-ci à une valeur d'épaisseur supérieure à 3 mm.Finally, the invention makes it possible to produce pulleys with multiple grooves which are particularly light and robust, since it is possible, for example, to thicken a sheet by tamping, at the rim, without weakening the latter to a value thicker than 3 mm.

Bien entendu, l'invention n'est pas limitée aux formes de poulies représentées sur les dessins. On peut proposer d'autres configurations du dispositif amortisseur de vibrations, du flasque, du moyeu et de la jante. On adaptera dans chaque cas la géométrie de la face frontale inférieure du fond de matrice et de la face frontale supérieure du poinçon à la forme de la poulie considérée.Of course, the invention is not limited to the forms of pulleys shown in the drawings. Other configurations of the vibration damping device, of the flange, of the hub and of the rim can be proposed. We will adapt in each case the geometry of the bottom front face of the bottom of die and of the upper front face of the punch to the shape of the pulley considered.

On peut par ailleurs proposer d'améliorer le guidage en coulissement l'une vers l'autre des parties inférieure et supérieure de l'outil en équipant ces dernières de colonnes de guidage supplémentaires montées à coulissement dans des embases rapportées sur celles-ci.It is also possible to propose improving the sliding guide towards one another of the lower and upper parts of the tool by equipping the latter with additional guide columns mounted to slide in bases mounted thereon.

Claims (12)

1/ Outil (1) à monter sur une presse et destiné au formage d'une ébauche de poulie (P) comprenant une jante (J) cylindrique de révolution autour d'un axe de symétrie (X) et un flasque (F) sur lequel se raccorde la jante, caractérisé en ce qu'il comprend : - un poinçon (10) et un fond de matrice (20), aptes à s'appliquer, au moins lors du fonctionnement de la presse, sur deux faces respectives opposées du flasque, le poinçon (10) présentant une surface radialement externe (11) cylindrique de révolution autour dudit axe de symétrie (X) et située du côté radialement interne de la jante (J), - une couronne d'extraction (30) montée à coulissement sur le poinçon (10), selon ledit axe de symétrie (X), et apte à s'appliquer sur le bord libre (B) de ladite jante, - une matrice (40) montée à coulissement sur le fond de matrice (20), selon ledit axe de symétrie (X), présentant une surface radialement interne (41) cylindrique de révolution autour dudit axe de symétrie (X), apte à couvrir, au moins lors du fonctionnement de la presse, ladite jante (J), et ménageant alors avec le poinçon (10) un espace annulaire (R) de largeur supérieure à l'épaisseur initiale (e) de la jante (J), l'un au moins de la couronne d'extraction (30) et du fond de matrice (20) étant entraîné, lors du fonctionnement de la presse, en rapprochement de l'autre, pour tasser axialement la jante entre une surface annulaire (21) du fond de matrice (20) et la couronne d'extraction (30), de façon à augmenter l'épaisseur de la jante jusqu'à atteindre la valeur de la largeur dudit espace annulaire (R). 1 / Tool (1) to be mounted on a press and intended for forming a pulley blank (P) comprising a rim (J) cylindrical of revolution around an axis of symmetry (X) and a flange (F) on which is connected to the rim, characterized in that it comprises: - a punch (10) and a die bottom (20), capable of being applied, at least during the operation of the press, on two respective opposite faces of the flange, the punch (10) having a radially external surface (11 ) cylindrical of revolution about said axis of symmetry (X) and located on the radially internal side of the rim (J), an extraction crown (30) mounted to slide on the punch (10), along said axis of symmetry (X), and capable of being applied to the free edge (B) of said rim, - a matrix (40) mounted to slide on the bottom of the matrix (20), along said axis of symmetry (X), having a radially internal surface (41) cylindrical of revolution around said axis of symmetry (X), capable of covering , at least during operation of the press, said rim (J), and then providing with the punch (10) an annular space (R) of width greater than the initial thickness (e) of the rim (J), l '' at least one of the extraction crown (30) and the die bottom (20) being driven, during operation of the press, in approaching the other, to axially compact the rim between an annular surface (21) of the bottom of the matrix (20) and the extraction crown (30), so as to increase the thickness of the rim until reaching the value of the width of said annular space (R). 2/ Outil selon la revendication 1, caractérisé en ce que le fond de matrice (20) est guidé en coulissement selon l'axe de symétrie (X) entre une position de fin de course où il vient en butée contre un support (50) solidaire d'une partie mobile de la presse et une position de début de course dans laquelle il est rappelé par des premiers moyens de rappel (60), et dans laquelle il vient en butée contre un épaulement (42) de la matrice (40), cette dernière étant montée à coulissement selon l'axe de symétrie (X) entre une position de fin de course dans laquelle elle vient en butée contre ledit support (50) et une position de début de course dans laquelle elle est rappelée par des deuxièmes moyens de rappel (70). 2 / Tool according to claim 1, characterized in that the bottom of the die (20) is guided in sliding along the axis of symmetry (X) between a limit position where it abuts against a support (50) integral with a movable part of the press and a start of travel position in which it is returned by first return means (60), and in which it abuts against a shoulder (42) of the die (40) , the latter being slidably mounted along the axis of symmetry (X) between an end of travel position in which it abuts against said support (50) and a start of travel position in which it is recalled by second return means (70). 3/ Outil selon l'une des revendications 1 et 2, caractérisé en ce que le poinçon (10) est monté à coulissement selon l'axe de symétrie (X) entre une position de fin de course dans laquelle il repose contre une semelle (90) solidaire d'une partie fixe de la presse et une position de début de course dans laquelle il est rappelé par des troisièmes moyens de rappel (80) et dans laquelle il vient en butée contre un épaulement (13) d'une pièce de retenue (120) fixée sur la semelle (90). 3 / Tool according to one of claims 1 and 2, characterized in that the punch (10) is slidably mounted along the axis of symmetry (X) between a limit position in which it rests against a sole ( 90) integral with a fixed part of the press and a start of travel position in which it is returned by third return means (80) and in which it abuts against a shoulder (13) of a piece of retainer (120) fixed on the sole (90). 4/ Outil selon l'une des revendications 1 à 3, caractérisé en ce que le poinçon (10) est monté à coulissement sur une broche de guidage (100) symétrique de révolution autour dudit axe de symétrie (X). 4 / Tool according to one of claims 1 to 3, characterized in that the punch (10) is slidably mounted on a guide pin (100) symmetrical of revolution around said axis of symmetry (X). 5/ Outil selon les revendications 2 et 4, caractérisé en ce que le fond de matrice (20) présente un alésage (110) apte à recevoir la broche de guidage (100) lors du fonctionnement de la presse. 5 / Tool according to claims 2 and 4, characterized in that the die bottom (20) has a bore (110) adapted to receive the guide pin (100) during operation of the press. 6/ Outil selon l'une des revendications 1 à 5, caractérisé en ce que la largeur dudit espace annulaire est supérieure ou égale à 3 mm. 6 / Tool according to one of claims 1 to 5, characterized in that the width of said annular space is greater than or equal to 3 mm. 7/ Outil selon l'une des revendications 1 à 6, caractérisé en ce que le poinçon (10) comporte sur sa face frontale supérieure (14) une surface plane, perpendiculaire à l'axe de symétrie et se raccordant, par un arrondi de rayon de courbure (r') inférieur ou égal à 1 mm, sur ladite surface radialement externe (11) du poinçon (10). 7 / Tool according to one of claims 1 to 6, characterized in that the punch (10) has on its upper front face (14) a flat surface, perpendicular to the axis of symmetry and connected by a rounded of radius of curvature (r ') less than or equal to 1 mm, on said radially external surface (11) of the punch (10). 8/ Procédé de fabrication d'une poulie à gorges multiples, caractérisé en ce qu'il comprend les étapes consistant à : - réaliser par emboutissage, à partir d'un flan circulaire, une ébauche de poulie en forme de cloche, présentant une jante cylindrique de révolution autour d'un axe de symétrie, - araser le bord libre de ladite jante pour éliminer des irrégularités de longueur dues à l'emboutissage, - retourner le fond de l'ébauche en forme de cloche pour former un flasque de poulie sur lequel se raccorde ladite jante, - tasser la jante dans un outil conforme à l'invention pour l'épaissir et lui donner une épaisseur constante, - réaliser par fluotournage des gorges multiples sur la jante épaissie. 8 / A method of manufacturing a pulley with multiple grooves, characterized in that it comprises the stages consisting in: - by stamping, using a circular blank, a bell-shaped pulley blank, having a cylindrical rim of revolution around an axis of symmetry, - level off the free edge of said rim to eliminate irregularities in length due to stamping, - turn the bottom of the bell-shaped blank to form a pulley flange to which said rim is connected, - compact the rim in a tool according to the invention to thicken it and give it a constant thickness, - make by grooving multiple grooves on the thickened rim. 9/ Procédé selon la revendication 8, caractérisé en ce que l'on emmanche à force, sur la surface radialement interne de la jante, une bague (503) d'un dispositif amortisseur de vibrations (500), sur la périphérie radialement interne de laquelle adhère, au moyen d'une couche de matériau viscoélastique (502), une couronne d'inertie (501). 9 / A method according to claim 8, characterized in that one forcibly engages, on the radially internal surface of the rim, a ring (503) of a vibration damping device (500), on the radially internal periphery of which adheres, by means of a layer of viscoelastic material (502), a crown of inertia (501). 10/ Poulie à gorges multiples réalisée par la mise en oeuvre du procédé selon l'une des revendications 8 et 9. 10 / Pulley with multiple grooves produced by the implementation of the method according to one of claims 8 and 9. 11/ Poulie selon la revendication 10, caractérisée en ce que la gorge (G₁) située la plus près du flasque de la poulie est délimitée extérieurement pour une extension annulaire présentant un décrochement (T) destiné à éviter un débordement axial de la courroie en cas de sauts de cette dernière. 11 / Pulley according to claim 10, characterized in that the groove (G₁) located closest to the flange of the pulley is delimited externally for an annular extension having a recess (T) intended to avoid an axial overflow of the belt in case jumps of the latter. 12/ Poulie à gorges multiples, comprenant une jante symétrique de révolution et un flasque en tôle, la jante se raccordant perpendiculairement sur le flasque sans former de boucle, la poulie étant munie intérieurement d'un dispositif amortisseur de vibrations emmanché à force dans la jante, I'épaisseur de la tôle du flasque étant supérieure ou égale à 3 mm. 12 / Pulley with multiple grooves, comprising a symmetrical rim of revolution and a sheet metal flange, the rim connecting perpendicularly to the flange without forming a loop, the pulley being provided internally with a vibration-absorbing device force-fitted into the rim , The thickness of the plate of the flange being greater than or equal to 3 mm.
EP19950400617 1994-03-22 1995-03-21 Method of producing a multi-belt pulley, form tool for carrying out the method and pulley thus obtained Expired - Lifetime EP0678351B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403336 1994-03-22
FR9403336A FR2717718B1 (en) 1994-03-22 1994-03-22 Method for manufacturing a pulley with multiple grooves, forming tool implemented by this method and pulley thus obtained.

Publications (2)

Publication Number Publication Date
EP0678351A1 true EP0678351A1 (en) 1995-10-25
EP0678351B1 EP0678351B1 (en) 2000-02-16

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Application Number Title Priority Date Filing Date
EP19950400617 Expired - Lifetime EP0678351B1 (en) 1994-03-22 1995-03-21 Method of producing a multi-belt pulley, form tool for carrying out the method and pulley thus obtained

Country Status (4)

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EP (1) EP0678351B1 (en)
DE (1) DE69515075T2 (en)
ES (1) ES2143014T3 (en)
FR (1) FR2717718B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130533A1 (en) * 2013-06-28 2014-12-29 Agla Power Transmission S P A METHOD FOR THE REALIZATION OF A PULLEY FOR SELF-MOTIONIC APPLICATIONS
CN105665514A (en) * 2016-03-30 2016-06-15 奇瑞汽车股份有限公司 Automobile top cover machining device
CN114192668A (en) * 2021-11-23 2022-03-18 东风柳州汽车有限公司 Side wall toolbox opening mould switches structure and mould

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006012318B4 (en) * 2005-04-08 2014-11-13 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Tools for sheet metal processing and machining units of such a tool

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088265A (en) * 1932-09-08 1937-07-27 Hulin Jules Dies for the manufacture of metal wheels
FR1583264A (en) * 1967-07-14 1969-10-24
US3768295A (en) * 1972-02-08 1973-10-30 Reynolds Metals Co Forming apparatus and method
US5129146A (en) * 1989-06-28 1992-07-14 Kabushiki Kaisha Kanemitsu Method of manufacturing poly-v pulleys from sheet metal
DE4220152A1 (en) * 1991-06-21 1992-12-24 Furukawa Aluminium LIGHTWEIGHT, V-SHAPED GROOVED PULLEY

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088265A (en) * 1932-09-08 1937-07-27 Hulin Jules Dies for the manufacture of metal wheels
FR1583264A (en) * 1967-07-14 1969-10-24
US3768295A (en) * 1972-02-08 1973-10-30 Reynolds Metals Co Forming apparatus and method
US5129146A (en) * 1989-06-28 1992-07-14 Kabushiki Kaisha Kanemitsu Method of manufacturing poly-v pulleys from sheet metal
DE4220152A1 (en) * 1991-06-21 1992-12-24 Furukawa Aluminium LIGHTWEIGHT, V-SHAPED GROOVED PULLEY

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130533A1 (en) * 2013-06-28 2014-12-29 Agla Power Transmission S P A METHOD FOR THE REALIZATION OF A PULLEY FOR SELF-MOTIONIC APPLICATIONS
EP2826571A3 (en) * 2013-06-28 2015-04-22 Agla Power Transmission S.p.a. Method for manufacturing a pulley for motor vehicle applications
CN105665514A (en) * 2016-03-30 2016-06-15 奇瑞汽车股份有限公司 Automobile top cover machining device
CN114192668A (en) * 2021-11-23 2022-03-18 东风柳州汽车有限公司 Side wall toolbox opening mould switches structure and mould

Also Published As

Publication number Publication date
DE69515075T2 (en) 2000-09-14
FR2717718B1 (en) 1996-06-28
FR2717718A1 (en) 1995-09-29
EP0678351B1 (en) 2000-02-16
DE69515075D1 (en) 2000-03-23
ES2143014T3 (en) 2000-05-01

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