EP3755920A1 - Power transmission belt - Google Patents

Power transmission belt

Info

Publication number
EP3755920A1
EP3755920A1 EP19708423.9A EP19708423A EP3755920A1 EP 3755920 A1 EP3755920 A1 EP 3755920A1 EP 19708423 A EP19708423 A EP 19708423A EP 3755920 A1 EP3755920 A1 EP 3755920A1
Authority
EP
European Patent Office
Prior art keywords
belt
strip section
link
strip
junction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19708423.9A
Other languages
German (de)
French (fr)
Inventor
Pierre-Régis Frey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imagine
Original Assignee
Imagine
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imagine filed Critical Imagine
Publication of EP3755920A1 publication Critical patent/EP3755920A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16GBELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00Driving-belts
    • F16G1/06Driving-belts made of rubber
    • F16G1/08Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/12Driving-belts made of rubber with reinforcement bonded by the rubber with metal reinforcement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16GBELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00Driving-belts
    • F16G1/28Driving-belts with a contact surface of special shape, e.g. toothed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16GBELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G3/00Belt fastenings, e.g. for conveyor belts
    • F16G3/02Belt fastenings, e.g. for conveyor belts with series of eyes or the like, interposed and linked by a pin to form a hinge

Definitions

  • the present invention relates to a power transmission belt comprising on at least one of its faces, teeth separated by a regular pitch to form at least one toothed face arranged to mesh toothed pulleys of a mechanical transmission, said belt comprising at least one band section provided with said at least one notched face and a tensile core embedded in its thickness to obtain a reinforced belt, said band section being delimited by two ends each provided with a tooth, and at least one transverse through hole or at least one locking pin, the ends of said at least one strip section being assembled by means of at least one connecting device cooperating with at least one locking pin to be at least partially removable, said at least one junction device being arranged to form a belt having two states of use: an open state ert in which the ends of said strip section are not assembled, and a closed state in which the ends of said strip section are assembled by said at least one joining device, said towing core comprising at least one tensile cable wound in turns or in longitudinal loops between the two ends of said strip section at least partially surrounding said at least
  • two-wheeled vehicles whether they are non-motorized: like the bicycle, the ATV, or equipped with an auxiliary electric motor such as the electrically assisted bicycle, etc., or whether they are motorized (heat engine or electric motor): such as the solex, the moped, the motorcycle, the moped, scooter, etc.
  • auxiliary electric motor such as the electrically assisted bicycle, etc.
  • motorized heat engine or electric motor
  • the concept of "two wheels” should not be limiting, as this type of vehicle can be divided into three or four wheels depending on the model.
  • a chain which is a closed mechanical element consisting of an assembly of a series of metal links for transmitting a movement without sliding between the pedal or the engine and a wheel or an axle.
  • This vehicle application requires the transmission member to transmit high forces, and as an example of the order of 2000N peak effort, to develop a maximum power of about 400W, especially during starting of the vehicle, for a low rotation speed, of the order of 80 to 140 rpm, with a relatively narrow transverse dimension, of the order of 12 mm, and a flexibility allowing it to mesh gears with variable diameters of largest to smallest, of the order of 45mm to l50mm with steps of 8M (8mm) or 11M (l lmm).
  • the chain offers an excellent compromise.
  • the links of the chain being removable, the chain can be mounted open on the vehicle, which facilitates its implementation on any type of frame or closed frame.
  • it allows changes in speed by any known system including a derailleur.
  • it has disadvantages: it relaxes and wears the gears prematurely, it must be greased regularly, it often derails and clogs quickly, it is dirty and noisy.
  • toothed belt made of a flexible material, such as polyurethane, neoprene-type rubber, or the like, and reinforced with steel, Kevlar®, carbon, fiberglass or similar cables.
  • a toothed belt has many advantages: it is economical, light and quiet, it dampens vibration, shock and transmission shock, it is clean and requires no maintenance, saving time, it does not derail it also has a significantly longer service life than the conventional chain drive system, while offering mechanical performance similar to that of a chain.
  • it has the following disadvantages: it is manufactured in closed loop without end, without possibility of opening.
  • the toothed or toothed pulleys of the transmission comprise guiding means, either in the form of flanges providing lateral guidance, or in the form of a central rib providing a central guide.
  • the publication US 2018/010667 A1 proposes a bicycle transmission belt according to the preamble of claim 1.
  • This belt is reinforced by cables wound in a loop around the mounting pins embedded in the ends of the belt.
  • the strands of the cables extend over two parallel plies in the thickness of said belt, spaced apart from each other by the diameter of said mounting shafts. But this belt can not work and / or is not feasible industrially.
  • the arrangement of the cables distributed over two parallel sheets requires that the length of the strands located on the inner perimeter is less than the length of the strands on the outer perimeter, if the cables are inextensible. Since each pair of inner and outer strands are part of the same loop that wraps around a mounting axis, the length of the strands tends to equilibrate, so that the industrial realization of such a belt, usually obtained by overmolding, is almost impossible.
  • the belt when the belt is mounted around the toothed pulleys, the belt describes two rectilinear sections respectively between the two pulleys, in which the parallel strands are of the same length, alternated with two curved sections at the right pulleys, in which the parallel strands are of different lengths.
  • the straight sections and the curved sections move continuously.
  • the cables are inextensible, the belt can not rotate.
  • the cables are extensible or elastic so that the strands on the inner perimeter can compress and the strands on the outer perimeter can stretch allowing the rotation of the belt, the pitch between the teeth of the belt will then function of the force transmitted by this belt and can not be respected, making the gear with the toothed pulleys impossible.
  • the publication EP 1 333 193 A1 relates to a toothed belt for transporting products, closed by two junction pieces in the form of staples, provided with interlocking teeth, secured to a central layer of said belt, and assembled by a single locking rod housed in a transverse hole formed by said connecting pieces when the teeth are nested one inside the other. It seems difficult or impossible to put the staples of the joining pieces to respect the regular pitch of the teeth of the belt.
  • This type of junction has the disadvantage of locking in the same plane three successive teeth of the belt, thus preventing the belt from wrapping around the pulleys and causing rapid wear of the belt.
  • this type of junction prevents the creation of a mechanical continuity between the traction core of the belt and the joining parts, prohibiting its application particularly in the field of the vehicle.
  • the publication JP S59 77146 A proposes an open toothed belt whose ends to be connected are each delimited by a tooth and are assembled by a detachable junction, in the form of a U-shaped stirrup fixed by screws screwed into holes provided. in the teeth. These fixing holes being located in the teeth of the belt are therefore arranged under the reinforcing ply.
  • the junction area obtained therefore has poor mechanical performance, related only to the strength of the material of the belt without involving the reinforcing ply.
  • it does not allow to respect the pitch between the teeth of said ends, the pitch between the two teeth located in the junction zone being necessarily less than the regular pitch of the teeth of the belt.
  • the current toothed belts and their associated junction system are not entirely satisfactory, the efforts transmitted being very insufficient and the respect of the step is not respected.
  • toothed belts are also used for power transmission.
  • the specification is however very different from the vehicle application, since the transmission members are generally wider, and as an example of the order of 10mm to 25mm, for steps of 8M (8mm) to 32M ( 32mm), turn faster, and as an example of the order of 1500 or 3000rpm in general, and mesh gears of larger diameter of the order of 40mm to 400mm.
  • the problem of the respect of the pitch between the teeth of the belt remains the same to be able to guarantee a perfect meshing with the toothed gears.
  • the present invention aims to overcome these disadvantages by providing a multi-purpose toothed belt, designed for power transmission in any field of application, said belt being equipped with a simple and fast mechanical joint allowing it to be mounted open in order to allow its implementation on any type of frame or closed frame, therefore no longer requiring modification of said frame to create a passage particularly detrimental to the mechanical strength of the frame or the frame, especially when it is made based on carbon fiber, said toothed belt mechanical junction being furthermore as efficient in terms of mechanical strength, flexibility and slip-free transmission as current toothed belts closed and that the traditional chains, and can be adapted to both lateral guidance and central guidance depending on the toothed pulleys.
  • the present invention also aims to provide a toothed belt mechanical junction designed to respect the regular pitch between the teeth and thus ensure a perfect meshing with the gears, in a wide range of steps, for example from 8M to 32M and in a wide range belt widths, for example from 12mm to 25mm, thus making it possible to cover all applications of the cycle to the industry, simply by adapting its mechanical joint.
  • the invention relates to a power transmission belt of the kind indicated in the preamble, characterized in that the strands of the turns or longitudinal loops of said at least one tensile cable forming said tensile core are all arranged side by side.
  • said at least one joining device may comprise at least one connecting link provided with two eyelets with parallel axes, spaced from said regular pitch, and at least one removable locking rod, and said at least one strip section may comprise at least one transverse orifice in at least one of said ends to accommodate said at least one removable locking rod.
  • one of the sides of said at least one connecting link may be secured to one end of said band section by a fixed locking rod.
  • Said at least one junction device may also comprise two removable locking rods, and said at least one tape section may then comprise a transverse orifice in each of said ends to accommodate said removable locking rods.
  • the two removable locking rods may be integral with one of the connecting links.
  • Said connecting device may according to the variants comprise two outer link links, arranged on either side of the sides of said strip section and aligned with each other transversely.
  • the flanks of said strip section may comprise a clearance for accommodating said outer link links in the width of said section.
  • said junction device may comprise at least one internal link link disposed in the width of said band section, and said at least one band section may in this case comprise in said ends. at least one notch for receiving said at least one inner link link.
  • said at least one strip section may comprise in said ends a number N of notches for receiving said inner link links.
  • said at least one junction device may comprise at least two junction pieces arranged to be assembled together by a single removable locking rod, and in this case one side of said junction pieces can be fixed. in each end of said strip section), said connecting device being arranged to move the teeth of said ends a multiple of said regular pitch.
  • said at least one joining device may comprise at least one open claw link and two fixed locking rods, said at least one link to claw being provided with two eyelets parallel axes, spaced from said regular pitch, each eyelet being open on a slot opening.
  • each locking rod can be secured to one end of said strip section.
  • It may also comprise at least one partially open claw link and two fixed locking rods, said at least one claw link being provided with two eyelets of parallel axes, spaced from said regular pitch, one eyelet of which is closed and one eyelet is open on an open slot.
  • one of the locking rods can be secured to one end of said strip section and pass through the closed eyelet of said at least one claw link, and the other locking rod can be secured to the other of said ends.
  • Said at least one strip section may then comprise at least one notch in said ends to receive said at least one claw link.
  • the belt according to the invention may also comprise several strip sections and several junction devices arranged to assemble the corresponding ends of said adjacent strip sections.
  • FIG. 1 is a perspective view of a power transmission belt according to a first embodiment of the invention, intended more particularly in the field of industry, assembled around two toothed pulleys with a first device of junction,
  • FIG. 2 is a view similar to FIG. 1 of a belt according to a second variant embodiment of the invention, intended more particularly for the field of cycle, assembled around two toothed pulleys by means of a second connecting device,
  • FIGS. 3 and 4 are enlarged perspective views of the detail A of FIG. 2 showing the junction zone of the belt in which its two ends are joined by the second junction device, respectively in plan view and in bottom view.
  • FIG. 5 is a longitudinal sectional view of the junction zone of the belt of FIG. 3, and FIG. 5A is an enlarged view of detail B of FIG. 5, FIG. 6 is a top view in transparency of FIG. open belt showing the pull core, and Figs. 6A and 6B are enlarged views of details C and D of Fig. 6,
  • FIG. 7 is a top view in transparency of the junction zone of the closed belt of FIG. 6,
  • FIG. 8 is a view similar to FIG. 7 of part of the junction zone of the closed belt of FIG. 1,
  • FIGS. 9 and 10 are front views of a joining zone of a belt according to two embodiments of the invention, shown in tensioned position, in which the notched profile of the belt is not deformed and the pitch P is respected
  • Figure 11 is a perspective view of a power transmission belt according to a third embodiment of the invention for the vehicle for example, assembled around two toothed pulleys flanges with a third junction device,
  • FIG. 12 is a bottom view, enlarged and in perspective, of the junction zone of the belt of FIG. 11,
  • FIGS. 13A and 13B are perspective views of a claw link forming part of the third connecting device, respectively according to two embodiments,
  • FIG. 14 is a longitudinal and enlarged sectional view of the junction zone of the belt of FIG. 11 provided with the claw link of FIG. 13A;
  • FIG. 15 is a top view in transparency and enlarged of one end of the open belt of FIG. 11 showing the traction core with the claw links of FIG. 13A,
  • FIG. 16 is an exploded perspective view of a section of the wide belt of FIG. 1 intended more particularly for the field of industry, and
  • Figure 17 is an exploded perspective view of a section of the narrow belt of Figure 2 according to another embodiment of the invention intended more particularly to the field of the cycle. Illustrations of the invention and different ways of making it:
  • the power transmission belt according to the invention is an open toothed belt provided with a mechanical connecting device for opening and closing said belt.
  • the junction device is made in such a way that, during the tensioning of the belt, no deformation modifies neither the notched profile of the belt, nor the pitch between the teeth to ensure its meshing with toothed gears, pulleys toothed or toothed pulleys of a mechanical transmission, referred to by a generic term "pulley" without this term being limiting.
  • 1, 2, 11, 16 and 17 illustrate various alternative embodiments of such an open transmission belt 10, 100, 110, 120, hereinafter referred to as a "belt", closed in a loop by at least one joining device.
  • the invention is of course not limited to this type of application, but extends to all types of vehicles, machines, machines, tools, equipment, etc. in all types of domestic, craft applications, industrial, etc. requiring a power transmission belt, a conveyor belt or the like.
  • the principle of the invention is to design an identical transmission belt over a range of dimensions and corresponding transmission forces corresponding to said dimensions, in a step ranging from 8M to 32M, over a bandwidth of 12mm to 25mm, with at least one mechanical junction adapted to the space available for the application in question.
  • Pulleys 1, 2; 1 ', 2' comprise in a known manner a toothed profile formed by a succession of teeth 3 separated by a regular pitch P, and delimiting between them notches 4.
  • the pulleys 1, 2 of Figure 2 further comprise a central rib 5, which is projecting in the notches 4 for transversely guiding the belt 10.
  • This type of central guidance is known by the English name "center track” or "central track” in the specific area of the cycle.
  • the transverse guidance of the belt 10 is not limited to this embodiment, but extends to any other guide mode, such as lateral guidance by flanged pulleys (see FIGS. 1 and 11). . Any other means of transverse guidance made by other means, but also the absence of guidance may be appropriate depending on the application considered.
  • FIGS. 1 and 11 illustrates a lateral guiding of the belt 100, 110 by pulleys 1 ', 2' provided for this purpose with lateral flanges 6.
  • pulleys 1 ', 2' provided for this purpose with lateral flanges 6.
  • the belt 10, 100, 110, 120 shown comprises in known manner a smooth face 11 and a notched face 12 formed by a succession of notches 13 separated by a regular pitch P corresponding to that of the pulleys 1, 2; 1 ', 2', and delimiting between them teeth 14.
  • the notched profile of the belt 10, 100, 110, 120 is designed to perfectly match the tooth profile pulleys 1, 2; 1 ', 2' to ensure a meshing without slipping.
  • the belt 10 further comprises a central groove 15, which is hollowed out in the teeth 14 and which is complementary to the central rib 5 pulleys 1, 2 for its central guidance. This central rib is absent in the belts 100, 110, 120 of Figures 1, 11, 17 since they can be guided by the side flanges 6 of the pulleys, 2 '.
  • the belt 10, 100, 110, 120 is made from at least one section 16 of a strip of material, hereinafter called "strip section 16".
  • This strip section 16 is open (FIG 6) and made of a synthetic material, thermoplastic or thermosetting, such as a polyurethane (PU), a polyurethane compound, a natural or synthetic rubber type neoprene®, or any equivalent material which has similar properties, namely in particular lightness, flexibility, robustness, high resistance to fatigue.
  • the strip portion 16 may be partially or completely covered with a coating that can help reduce the coefficient of friction, reduce abrasion, and reduce noise, while increasing the life of the belt. This coating may be a reinforcing textile or the like.
  • This strip section 16 may be manufactured by extrusion in the form of a strip of continuous material, cut to the desired width and / or length (s), or by molding, injection, or thermoforming to the width and / or to the desired length (s). Of course, any other equivalent manufacturing technique may be suitable. It is terminated by two ends 17, 18. These two ends 17, 18 are straight and perpendicular to the longitudinal axis of said strip section 16, with or without notch 21 as explained below, depending on the type of mechanical connection chosen. These two ends 17, 18 each further comprise a tooth 14 making it possible to have a sufficient thickness of material to provide a connection with at least one joining device 40, 50, 60.
  • the two ends 17, 18 of said strip section 16 are provided to be assembled by a junction device 40, 50, 60 arranged to be at least partly removable.
  • a junction device 40, 50, 60 arranged to be at least partly removable.
  • the junction device 40, 50, 60 is designed and dimensioned to ensure a spacing of the teeth 14 provided at both ends 17, 18 of the regular pitch P or a multiple a regular pitch P, to ensure the gearing of the belt 10, 100, 110, 120 with the pulleys 1, 2; 1 ', 2'.
  • the junction device 40, 50, 60 comprises, according to the embodiments, open or closed links, and fixed or removable locking rods, arranged transversely in the ends 17, 18 of the strip section 16.
  • locking rod a preferably fixed or removable metal axis, of cylindrical or non-cylindrical section, with a smooth, threaded, or notched surface, with or without a head, in one piece or in two parts mounted upside down, these examples not being as limiting.
  • the first junction device 40 comprises one or more connecting links 41, each link being closed and provided with two eyelets 43 having a parallel axis and a center distance preferably equal to the pitch P.
  • connecting links 41 are arranged parallel, in the width of said strip section 16 and are connected to the ends 17, 18 by rods of locking 42, which pass through the eyelets 43 and the transverse orifices 19 aligned with each other. At least one of these locking rods 42 is removable and removable to allow disassembly of the connecting device 40 with respect to at least one of the ends 17, 18 and the opening of the strip section 16.
  • the locking rods 42 may well All or some of the parts may be replaced by any other technically equivalent locking member, allowing assembly of the connecting links 41 at the ends 17, 18 of the strip section 16 by interlocking, screwing, crimping, stitching, overmoulding, bonding, welding, or any other known mechanical process.
  • the junction device 40 can also combine different locking members, the essential being that it is removable at least on one side of the connecting links 4L
  • junction device 40 may comprise several connecting links 41, it being specified that the number of these links and their arrangement in the width of the strip section 16 are not limiting. and are determined according to the width of the belt and the forces to be transmitted by said belt.
  • the junction device 40 illustrated in FIG. 1 is adapted to a wide belt 110 intended in particular for the field of industry, and comprises a plurality of connecting links 41, and for example thirteen, all housed inside the belt. 110, in notches 21 provided in the two ends 17, 18. All the connecting links 41 are assembled by two locking rods 42 at the ends 17, 18 adjacent to the belt 110.
  • the junction device 40 illustrated in FIGS. 4 is adapted to a narrow belt 10 especially for the cycle domain, and comprises three connecting links 41, including two outer links clad on the sidewalls of the belt 20 and an inner link, having a central position and being housed in a notch 21, the three connecting links 41 are assembled to the ends 17, 18 of the adjoining belt 20 by two locking rods 42.
  • link links 41 interiors may well It is understood that the width of the belt is used in order to optimize the mechanical strength with respect to the diameter of the locking rods 42.
  • the arrangement of the two link links 41 outside the strip section 16 imposes a central guide of the belt. belt 10 as shown in Figure 2.
  • the outer link links 41 can be embedded in the width of the strip section 16, as well as the inner links, thus allowing lateral guidance of the belt by pulleys to flanges G, 2 ', as in Figure 17.
  • the connecting links 41 consist of a metal bar, forming two ears, each provided with an eyelet 43, connected by a part central narrowed.
  • the connecting links 41 shown in more detail in FIGS.
  • substantially shaped glasses and have a straight outer edge and a hollow inner edge to provide a clearance J both with the top of the teeth 3 with the top of the central rib 5 provided on the pulleys 1, 2 allowing avoid any interference or collision.
  • outer edge the edge of the links disposed on the side of the smooth face 11 of the belt 10, 110, and “inner edge”, the edge of the links disposed on the side of the notched face 12 of the belt 10 110.
  • connecting links 41 is not limited to these variants but extends to any other form compatible with the toothed belt and the toothed pulleys. Two other examples are illustrated and described with reference to FIGS. 11 and 17. Standard commercially available connecting links can also be used, provided that the shape and dimensions of the locking rods 42, 52 and the transverse holes are adapted. 19 who receive them.
  • the junction device may comprise at least two connecting pieces, equivalent or not to links, intended to be assembled together by a single removable locking rod or by any other technically equivalent locking member to make the junction device removable.
  • each junction piece is connected to one of the two ends 17, 18 of the band section 16, for example by overmolding, crimping, gluing, welding, etc. They comprise at least one eyelet or a transverse passage to accommodate the single removable locking rod which connects them.
  • the junction device is dimensioned to correspond exactly to a multiple of the regular pitch P, for example to 2xP, if it comprises two junction pieces, in order to guarantee the meshing of the toothed belt in the pulleys. toothed.
  • the second junction device 50 comprises open links, called claw links 51, 5G, which are illustrated in detail in FIGS. 13A and 13B, which have the advantage of being able to be assembled and dismounted on locking rods 52 fixed and non-removable, which does not prevent the use with removable locking rods 52.
  • claw links 51, 5G are preferably assembled at the ends 17, 18 of the strip of material 16, from below or the notched face 12 of the belt 100. They can also be assembled by the top or the smooth face 11 of the belt 100, but this solution is not optimal taking into account in particular the shape of the belt 100, the little material available in the upper part of the belt 100, the way the belt 100 works in bending and in traction, etc.
  • the locking rods 52 are advantageously secured to the ends 17, 18 of the belt 100, and preferably overmolded to be embedded in the material web 16. Thus, they are no longer removable, as in the device 40, where it was necessary to thread them through the eyelets 43 and the transverse orifices 19.
  • all the claw links 51, 5G are housed within the width of the belt 100 and more precisely in notches 21 provided for this purpose in the ends 17 and 18 of the strip of material 16.
  • the junction device 50 comprises two claw links 51, 5G.
  • the number of claw links 51, 51 ' is of course not limiting and may be equal to one or greater than two, this number may be even or odd, depending on the transverse dimension of the belt 100. If the number claw links 51, 51 'is an odd number, so a central guide of the belt 100 will no longer be suitable (see Figs 1 and 16).
  • Figures 13A and 13B illustrate two examples of claw links 51, 51 'compatible.
  • the claw link 51 according to Figure 13A consists of a metal bar, forming two ears, connected by a narrowed central portion. Each ear has an eyelet 53 open on a slot 54 opening into the upper edge of the claw link 51, the two open eyes 53 having parallel axes and a spacing preferably equal to the pitch P.
  • the slots 54 are also slightly inclined. one towards the other, along an axis A with respect to the vertical axis with reference to FIG. 14, so that their axes A intersect beyond the upper edge of the claw link 51.
  • the slots 54 delimit with the corresponding end of the ears, a kind of claw 55 promoting an automatic locking of the claw link 51, when it is fitted on the locking rods 52, and avoiding any accidental release of the claw link 51.
  • the locking is also obtained thanks to the tension exerted on the belt which blocks the claw link 51 by means of the claws 55.
  • the claw link 51 is symmetrical relative to its vertical median axis and asymmetrical with respect to a horizontal median axis passing through. by the center of the eyelets 53 with reference to Figure 14. It has substantially a shape of glasses, and has a straight outer edge and a hollow inner edge to provide a clearance J with the top of the teeth 3 provided on the pulleys G, 2 thus avoiding any interference or collision.
  • the claw link 51 ' differs from the first example in that it has in one of the ears a closed eyelet 53', and in the other ear an eyelet 53 open on a slot 54 delimiting a claw 55.
  • This embodiment associated with fixed locking rods 52, makes it necessary to integrate, in one of the ends 17, 18 of the strip of material 16, the side of the claw link 51 'comprising the eye 53 'closed, traversed by one of the locking rods 52, to bind the corresponding side of the claw link 51' at the end
  • FIG 16 is a partial enlarged view of the connecting device 40 of Figure 1 adapted for a belt 110 said wide relative to the other belts 10, 100 120, intended in particular in the field of industry.
  • This junction device 40 comprises a plurality of connecting links 41, in the example represented thirteen links, distributed at regular intervals in the width of the belt 110.
  • the connecting links 41 are all housed inside the belt 110. in notches 21 provided for this purpose in the ends 17 and 18 of the strip of material 16.
  • all the connecting links 41 are connected by one of their sides at one end 17 of the strip of material 16, via a locking pin 42 fixed.
  • Another locking rod 42 which is removable, allows in a single operation to mechanically link the free side of the connecting links 41 at the other end 18 of the strip of material 16 after having fitted them into the corresponding notches 21.
  • a junction device 50 it is also possible to use a junction device 50.
  • the two locking rods 52 are secured to the ends 17 and 18 of the strip of material 16 in order to fit the claw links 51 by fitting therein. , 5 G with reference to Figures 11 to 15. If one opts for 5G open claw links, in part, they can be secured in one end 17, 18 of the belt 110 and no junction piece can be lost.
  • FIG. 17 illustrates another example of a so-called narrow belt 120, intended in particular for the cycle domain, closed by a third junction device 60.
  • This junction device 60 comprises three connecting links 61, 61 ', including two links 61 which can similar to the links 41, and a link 61 'which forms a locking link since it comprises in an integrated manner two locking rods 62.
  • the flanks of the material strip 16 comprise a clearance 121 at the right of the zone. connecting junction to accommodate two link links 61, 61 'outside the width of the belt 120, and an inner link link 61 in the corresponding notches 21.
  • the assembly of the ends 17 and 18 of the strip of material 16 to close the belt 120 is fast since the establishment of the third connecting link 61 'makes it possible to bind and lock the two other links 61 to said ends 17, 18 thanks to the integrated locking rods 62.
  • the number of connecting links 61, 61 ' is not limited and may be two or more than three depending on the width of the belt and the forces to be transmitted.
  • the traction core 22 consists of a single traction cable. 23, circulating from one end 17 to the other end 18, wound in turns around the transverse orifices 19 or locking rods 42, 52 if they are integrated by gluing, overmoulding or the like, into one and / or other of said ends 17, 18, without these examples being limiting.
  • transverse orifices 19 is meant passages for receiving locking rods 42, 52 as well as a side of a connecting link 41, a claw link 51, 51 ', or a piece of integrated junction by gluing, overmolding or the like, in said end 17, 18.
  • the tensile core 22 may consist of several traction cables, each wound in an open or closed loop between the two ends 17, 18, around said transverse orifices 19 or locking rods 42, 52. Any other construction of an equivalent tensile core may be suitable.
  • the turns or loops formed by the traction cable or cables 23 may be distributed in the width of the strip section 16 regularly or irregularly as in the belts 10, 100, 110, 120 to take account of the notch 21 or the notches 21.
  • the manner of distributing the turns or loops of the traction cable or cables 23 in the width of the strip section 16 may vary according to the specifications of each belt 10, 100, 110, 120.
  • this type of assembly has the advantage of maintaining the integrity of the belt 10, 100, 110, 120 which thus does not include any welding or breaking primer, contrary to the prior art cited.
  • the traction core 22 is imperatively disposed in the center of the thickness of the strip section 16, more particularly in a median plane of said belt which corresponds to the neutral fiber of the belt 10, 100, 110, 120, just above above the notched face 12 ( Figures 9 and 10).
  • the term "neutral fiber” is the median plane in which the length of the fibers is invariable regardless of the radius of curvature of the belt.
  • the strands 24 of the turns or longitudinal loops of the traction cable or cables 23 are all arranged side by side in the same plane, without being superimposed, this plane being coincident with said neutral fiber of the belt.
  • the length of the strands 24 of the traction core 22 is also invariable regardless of the radius of curvature of said belt.
  • traction core 22 means one or more son or cables, individual or assembled twisted or twisted braided or plaited or woven, of textile and / or metal.
  • the longitudinal turns of the traction core 22 could be assembled together by a transverse frame forming with them a lattice.
  • This traction core 22 must adhere to the thermoplastic or thermosetting material of the strip section 16 and have excellent tensile strength, high flexibility, minimum elongation or even zero, good resistance to bending. Synthetic continuous filaments will be preferred to metal wires, without this example being limiting.
  • the position of the transverse orifices 19 or locking rods 42, 52, 62 in the ends 17, 18 of the strip section 16 is decisive, as is the position of the traction core 22.
  • the solution of the invention consists in positioning or aligning the axis of the transverse orifices 19 or locking rods 42, 52, 62 in the same plane as the traction core 22, this plane coinciding with the median plane of the belt which corresponds to the fiber according to FIGS. 9 and 10.
  • this positioning may necessitate thickening the strip section 16 to embed the towing cable. 23 wound around the transverse orifices 19 or locking rods 42, 52, 62.
  • this addition of material has the effect of increasing the weight of the belt and especially its bending stiffness which reduces its radius of curvature.
  • the material increase can be advantageously limited to the ends 17, 18 of the strip section 16 by creating a bead 25 above each of the end teeth 14. This extra thickness located on the outer side of the belt 10 is not detrimental to the proper operation of the transmission.
  • the smooth face 11 of the belt 10, 100, 110, 120 is generally intended to cooperate with a tensioner roller (not shown), which is subject to a return member to ensure a uniform tension throughout the belt .
  • This tensioner roller thus makes it possible to compensate for any variation in the thickness of the belt, in particular when the junction device 40, 50, 60 and the end beads 25 pass.
  • the outer edge of the links 41, 61 provides continuity between the two beads 25.
  • the smooth face 11 may further comprise or not longitudinal flanges 26 to contribute to the transverse guidance of the belt 100, 110, 120. These longitudinal flanges 26 are visible in FIGS. 3, 4 and 5.
  • the number of longitudinal flanges 26 may be greater than two depending on the width of the belts 10, 100, 110, 120 and can ensure continuous contact with a tensioner.
  • these longitudinal flanges 26 could be replaced by close transverse ribs, which would ensure almost continuous contact with a tensioner roller, while limiting the bending stiffness of said belt 10, 100, 110, 120.
  • each section of open strip 16 is preferably manufactured by a simple molding process in an imprint which corresponds to the size and profile of the belt 10, 100 , 110, 120 for the application for which it is intended.
  • two transverse pins may be placed in the cavity in the two end zones intended to form the ends 17, 18 of said strip section 16, to create the transverse orifices 19, taking care to position the axes of said pins in the median plane of the belt which will correspond to its neutral fiber.
  • the traction core 22 is deposited in the cavity, for example according to the diagram illustrated in FIG.
  • FIG 6 starting from a longitudinal edge of the impression and describing longitudinal turns of a transverse pin to the other transverse pin to reach the other longitudinal edge of the footprint.
  • turns are formed around the transverse pins which delimit the transverse orifices 19 arranged in the tooth 14 of each end 17, 18.
  • any other method of construction of the traction core 22 may be suitable.
  • the traction core 22 thus forms inside the footprint a traction sheet, in which all the strands 24 of the longitudinal turns are situated in the same longitudinal plane, which will be merged with the median plane of the belt corresponding to its neutral fiber.
  • the thermoplastic material is added in the cavity to form the strip section 16 which will form the belt 10, 120.
  • the filled cavity can be placed in a heating press if necessary.
  • the two transverse pins are removed beforehand.
  • the strip section 16 comes out of manufacture, at least one of its ends 17, 18 can be assembled to the connecting links 41 of the junction device 40 corresponding with a first locking rod 42, the other locking rod 42 being introduced into the eyelets 43 on hold. It can also be assembled to form a belt 10, 120 closed by introducing the two locking rods 42, 62 into the eyelets 43, 63 of the connecting links 41, 61, 61 'and the transverse orifices 19 of the two ends 17, 18
  • the belt 10, 120 obtained can be stored, transported, etc. either in its open state or in its closed state.
  • FIGS. 1 and 16 it is possible to have in the cavity a single transverse pin in one of the two end zones intended to form one of the ends 17, 18 of said strip section 16, to create a transverse orifice 19. Then one side of the connecting link or links 41 corresponding to the junction device 40 can be arranged in the opposite end zone, and a locking rod 42 inserted into the corresponding eyelets 43 of these links, so that the assembly is directly overmoulded with the band section 16 in one of its ends 17, 18.
  • the device junction 40 will comprise only one removable locking rod 42, allowing its disassembly on the side of the end 17, 18 remained free. The assembly of the two ends 17, 18 to close the belt 10 will thus require only the introduction of this single removable locking rod 42 in the eyelets 43 and waiting in the transverse hole 19 of said end 17, 18 free.
  • the joining device may comprise at least two connecting pieces, assembled together by a single removable locking rod, it is possible to dispose in each end zone of the impression, a side d a connecting piece so that it is directly overmolded with the corresponding end 17, 18 of the band section 16.
  • the assembly of the two ends 17, 18 to close the belt will require the introduction of a single locking rod 42 removable in the eyelets or corresponding transverse passages of said connecting pieces.
  • two locking rods 52 can be placed in the cavity in the two end zones. intended to form the ends 17, 18 of the strip section 16, to overmold them in the two ends 17, 18 of the strip section 16. It is also possible to have in the cavity a single locking rod 52 in one of the two end zones intended to form one of the ends 17, 18 of the band section 16, and have in the opposite end zone, a locking rod 52 through the closed eyelet 53 'of the claw link 51', to overmold them in the corresponding end 17, 18 of the band section 16.
  • the junction device 50 no longer comprises a removable locking rod 52, but only removable claw links 51 or links claw 51 'hinged, allowing disassembly or both sides, either the side of the end 17, 18 remaining free. Assembling the two ends 17, 18 to close the belt 100 thus will be faster and easier since it will be obtained by interlocking one or both claws 55 of the links 51, 5 on one or two fixed locking rods 52.
  • the invention achieves the goals set, namely a new generation of toothed belt mechanical junction, which has the advantage of having two positions of use: an open position greatly facilitating its assembly and its disassembly on any type of frame or frame, whether open or closed, and a closed position offering the same advantages and mechanical performance as the known belts, especially in terms of respect for the regular pitch P between the teeth, tensile strength without elongation, resistance to fatigue.
  • the belt according to the invention allows the transmission of high forces on the order of 1500N in continuous and 2000N in peak of efforts in the field of the cycle, with narrow belts typically of the order l2mm, whereas comparatively the solution of the state of the art would have achieved a value of effort of 900N. Again, these values are given by way of non-limiting example to demonstrate the new performance of the invention.
  • the invention therefore opens up new possibilities of applications.
  • One of the applications concerns for example the maintenance of machines.
  • the belt 10, 100, 110, 120 according to the invention can easily comprise one or more strip sections 16, assembled to one another by one or more junction devices 40, 50, 60 in the manner of a chain. It is therefore possible, from different lengths of strip sections 16, to reconstruct several lengths of power transmission belt. This possibility offers machine operators having in stock different lengths of tape sections 16 and different junction devices 40, 50, 60 enabling them to instantly replace a defective belt in order to minimize the downtime of the machine.
  • the present invention is of course not limited to the embodiments described but extends to any modification and variation obvious to a person skilled in the art. In particular, the different embodiments of belt and junction devices can be combined.

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Abstract

The invention concerns a power transmission belt (10) comprising an open band section (16), delimited by two ends (17, 18), assembled by a junction device (40) cooperating with locking rods (42) so as to be able to be at least partially dismounted, arranged to space apart the teeth (14) of the ends (17, 18) by the pitch (P) of the notched face (12) of said belt (10). The notched belt therefore has two use states: an open state allowing it to be mounted on a closed frame or chassis, and a closed state providing traction resistance at least equal to that of a chain or notched belt manufactured as a closed loop. To this end, it comprises a traction core wound around the locking rods (42) provided in said ends (17, 18), the strands of the cables of which are arranged side by side in the median plane of said belt corresponding to the neutral fibre of same. The junction device (40) of same is designed to observe the regular pitch (P) between the teeth and ensure the meshing of the toothed gears (1, 2).

Description

COURROIE DE TRANSMISSION DE PUISSANCE  POWER TRANSMISSION BELT
Domaine technique : Technical area :
La présente invention concerne une courroie de transmission de puissance comportant sur au moins l’une de ses faces, des dents séparées d’un pas régulier pour former au moins une face crantée agencée pour engrener des poulies dentées d’une transmission mécanique, ladite courroie comportant au moins un tronçon de bande pourvu de ladite au moins une face crantée et d’une âme de traction noyée dans son épaisseur pour obtenir une courroie renforcée, ledit tronçon de bande étant délimité par deux extrémités chacune pourvue d’une dent, et d’au moins un orifice transversal traversant ou d’au moins une tige de verrouillage, les extrémités dudit au moins un tronçon de bande étant assemblées au moyen d’au moins un dispositif de jonction coopérant avec au moins une tige de verrouillage pour être au moins en partie démontable, ledit au moins un dispositif de jonction étant agencé pour former une courroie ayant deux états d’utilisation : un état ouvert dans lequel les extrémités dudit tronçon de bande ne sont pas assemblées, et un état fermé dans lequel les extrémités dudit tronçon de bande sont assemblées par ledit au moins un dispositif de jonction, ladite âme de traction comportant au moins un câble de traction enroulé en spires ou en boucles longitudinales entre les deux extrémités dudit tronçon de bande en entourant au moins partiellement ledit au moins un orifice transversal ou ladite au moins une tige de verrouillage. The present invention relates to a power transmission belt comprising on at least one of its faces, teeth separated by a regular pitch to form at least one toothed face arranged to mesh toothed pulleys of a mechanical transmission, said belt comprising at least one band section provided with said at least one notched face and a tensile core embedded in its thickness to obtain a reinforced belt, said band section being delimited by two ends each provided with a tooth, and at least one transverse through hole or at least one locking pin, the ends of said at least one strip section being assembled by means of at least one connecting device cooperating with at least one locking pin to be at least partially removable, said at least one junction device being arranged to form a belt having two states of use: an open state ert in which the ends of said strip section are not assembled, and a closed state in which the ends of said strip section are assembled by said at least one joining device, said towing core comprising at least one tensile cable wound in turns or in longitudinal loops between the two ends of said strip section at least partially surrounding said at least one transverse orifice or said at least one locking pin.
Technique antérieure : Prior art:
Un des domaines techniques qui intéresse, en particulier mais non exclusivement, l’invention est celui entre autres des véhicules à deux roues, qu’ils soient non motorisés : comme la bicyclette, le VTT, ou équipés d'un moteur électrique auxiliaire comme le vélo à assistance électrique, etc., ou qu’ils soient motorisés (moteur thermique ou électrique) : comme le solex, la mobylette, la motocyclette, le cyclomoteur, le scooter, etc. La notion de « deux roues » ne doit pas être limitative, car ce type de véhicules peut se décliner en trois voire en quatre roues selon les modèles. Dans ce type de véhicule, on utilise traditionnellement comme organe de transmission de puissance une chaîne, qui est un élément mécanique fermé constitué d'un assemblage d'une suite de maillons métalliques servant à transmettre un mouvement sans glissement entre le pédalier ou le moteur et une roue ou un essieu. Cette application véhicule impose à l’organe de transmission de transmettre des efforts élevés, et à titre d’exemple de l’ordre de 2000N en pic d’efforts, permettant de développer une puissance maximale de l’ordre de 400W, notamment lors des démarrages du véhicule, pour une vitesse de rotation faible, de l’ordre de 80 à l40tr/mn, avec une dimension transversale relativement étroite, de l’ordre de l2mm, et une souplesse lui permettant d’engrener des pignons de diamètres variables du plus gros au plus petit, de l’ordre de 45mm à l50mm avec des pas de 8M (8mm) ou 11M (l lmm). La chaîne offre ainsi un excellent compromis. En outre, les maillons de la chaîne étant démontables, la chaîne peut être montée ouverte sur le véhicule, ce qui facilite sa mise en place sur tout type de cadre ou de châssis fermé. De plus, elle permet les changements de vitesse par tout système connu notamment par un dérailleur. Elle présente toutefois des inconvénients : elle se détend et use prématurément les pignons, elle doit être graissée régulièrement, elle déraille souvent et s’encrasse rapidement, elle est sale et bruyante. One of the technical fields which interests, in particular but not exclusively, the invention is that among others two-wheeled vehicles, whether they are non-motorized: like the bicycle, the ATV, or equipped with an auxiliary electric motor such as the electrically assisted bicycle, etc., or whether they are motorized (heat engine or electric motor): such as the solex, the moped, the motorcycle, the moped, scooter, etc. The concept of "two wheels" should not be limiting, as this type of vehicle can be divided into three or four wheels depending on the model. In this type of vehicle, traditionally used as a power transmission member a chain, which is a closed mechanical element consisting of an assembly of a series of metal links for transmitting a movement without sliding between the pedal or the engine and a wheel or an axle. This vehicle application requires the transmission member to transmit high forces, and as an example of the order of 2000N peak effort, to develop a maximum power of about 400W, especially during starting of the vehicle, for a low rotation speed, of the order of 80 to 140 rpm, with a relatively narrow transverse dimension, of the order of 12 mm, and a flexibility allowing it to mesh gears with variable diameters of largest to smallest, of the order of 45mm to l50mm with steps of 8M (8mm) or 11M (l lmm). The chain offers an excellent compromise. In addition, the links of the chain being removable, the chain can be mounted open on the vehicle, which facilitates its implementation on any type of frame or closed frame. In addition, it allows changes in speed by any known system including a derailleur. However, it has disadvantages: it relaxes and wears the gears prematurely, it must be greased regularly, it often derails and clogs quickly, it is dirty and noisy.
Une des alternatives à la chaîne est une courroie crantée, réalisée dans un matériau souple, tel que du polyuréthane, du caoutchouc de type néoprène®, ou similaire, et renforcée par des câbles en acier, Kevlar®, carbone, fibre de verre ou similaire. Une telle courroie crantée présente de nombreux avantages : elle est économique, légère et silencieuse, elle amortit les vibrations, chocs et à-coups de transmission, elle est propre et ne nécessite aucun entretien d’où un gain de temps, elle ne déraille pas, elle bénéficie en plus d’une durée de vie nettement supérieure au système de transmission classique par chaîne, tout en offrant des performances mécaniques similaires à celles d’une chaîne. Elle présente toutefois les inconvénients suivants : elle est fabriquée en boucle fermée sans fin, sans possibilité d’ouverture. Elle nécessite par conséquent un cadre ou un châssis spécial pourvu au moins d’une pièce mécaniquement démontable pour permettre le passage de la courroie, qui présente l’inconvénient de réduire la rigidité du cadre ayant pour effet de baisser les performances du véhicule. Si pour pallier cet inconvénient, on cherche à augmenter la rigidité du cadre par d’autres moyens, le poids du véhicule est impacté, ayant également pour effet de baisser ses performances. En outre, la courroie crantée nécessite un système de changement de vitesse différent, intégré dans le moyeu de la roue arrière, car elle n’autorise aucun déplacement transversal à l’inverse de la chaîne. A cet effet, la courroie crantée doit être guidée longitudinalement. Les poulies dentées ou crantées de la transmission comportent à cet effet des moyens de guidage, soit sous la forme de flasques assurant un guidage latéral, soit sous la forme d’une nervure centrale assurant un guidage central. La publication US 2018/010667 Al propose une courroie de transmission pour bicyclette, conformément au préambule de la revendication 1. Cette courroie est renforcée par des câbles enroulés en boucle autour des axes de montage noyés dans les extrémités de la courroie. Les brins des câbles s’étendent sur deux nappes parallèles dans l’épaisseur de ladite courroie, distantes l’une de l’autre du diamètre desdits axes de montage. Or cette courroie ne peut pas fonctionner et/ou n’est pas réalisable industriellement. En effet, l’agencement des câbles répartis sur deux nappes parallèles nécessite que la longueur des brins situés sur le périmètre intérieur soit inférieure à la longueur des brins situés sur le périmètre extérieur, si les câbles sont inextensibles. Etant donné que chaque paire de brins intérieur et extérieur fait partie d’une même boucle qui s’enroule autour d’un axe de montage, la longueur des brins a tendance à s’équilibrer, de sorte que la réalisation industrielle d’une telle courroie, généralement obtenue par surmoulage, est quasi impossible. En outre, lorsque la courroie est montée autour des poulies dentées, la courroie décrit deux tronçons rectilignes respectivement entre les deux poulies, dans lesquels les brins parallèles sont de même longueur, alternés avec deux tronçons courbes au droit des poulies, dans lesquels les brins parallèles sont de longueurs différentes. Lorsque la courroie tourne, les tronçons rectilignes et les tronçons courbes se déplacent continuellement. Ainsi, si les câbles sont inextensibles, la courroie ne peut pas tourner. A l’inverse si les câbles sont extensibles ou élastiques de sorte que les brins situés sur le périmètre intérieur puissent se comprimer et les brins situés sur le périmètre extérieur puissent s’étirer permettant ainsi la rotation de la courroie, le pas entre les dents de la courroie sera alors fonction de l’effort transmis par cette courroie et ne pourra pas être respecté, rendant l’engrenage avec les poulies dentées impossible. One of the alternatives to the chain is a toothed belt, made of a flexible material, such as polyurethane, neoprene-type rubber, or the like, and reinforced with steel, Kevlar®, carbon, fiberglass or similar cables. . Such a toothed belt has many advantages: it is economical, light and quiet, it dampens vibration, shock and transmission shock, it is clean and requires no maintenance, saving time, it does not derail it also has a significantly longer service life than the conventional chain drive system, while offering mechanical performance similar to that of a chain. However, it has the following disadvantages: it is manufactured in closed loop without end, without possibility of opening. It therefore requires a frame or a special frame provided with at least a mechanically removable part to allow the passage of the belt, which has the disadvantage of reducing the rigidity of the frame having the effect of lowering the performance of the vehicle. If to overcome this disadvantage, it seeks to increase the rigidity of the frame by other means, the weight of the vehicle is impacted, also having the effect of lowering its performance. In addition, the toothed belt requires a different gearshift system, integrated into the hub of the rear wheel, because it allows no transverse movement to the reverse of the chain. For this purpose, the toothed belt must be guided longitudinally. For this purpose, the toothed or toothed pulleys of the transmission comprise guiding means, either in the form of flanges providing lateral guidance, or in the form of a central rib providing a central guide. The publication US 2018/010667 A1 proposes a bicycle transmission belt according to the preamble of claim 1. This belt is reinforced by cables wound in a loop around the mounting pins embedded in the ends of the belt. The strands of the cables extend over two parallel plies in the thickness of said belt, spaced apart from each other by the diameter of said mounting shafts. But this belt can not work and / or is not feasible industrially. Indeed, the arrangement of the cables distributed over two parallel sheets requires that the length of the strands located on the inner perimeter is less than the length of the strands on the outer perimeter, if the cables are inextensible. Since each pair of inner and outer strands are part of the same loop that wraps around a mounting axis, the length of the strands tends to equilibrate, so that the industrial realization of such a belt, usually obtained by overmolding, is almost impossible. In addition, when the belt is mounted around the toothed pulleys, the belt describes two rectilinear sections respectively between the two pulleys, in which the parallel strands are of the same length, alternated with two curved sections at the right pulleys, in which the parallel strands are of different lengths. As the belt rotates, the straight sections and the curved sections move continuously. Thus, if the cables are inextensible, the belt can not rotate. Conversely if the cables are extensible or elastic so that the strands on the inner perimeter can compress and the strands on the outer perimeter can stretch allowing the rotation of the belt, the pitch between the teeth of the belt will then function of the force transmitted by this belt and can not be respected, making the gear with the toothed pulleys impossible.
La publication EP 1 333 193 Al concerne une courroie crantée servant à transporter des produits, fermée par deux pièces de jonction en forme d’agrafes, pourvues de dents d’emboîtement, solidarisées à une couche centrale de ladite courroie, et assemblées par une unique tige de verrouillage logée dans un orifice transversal formé par lesdites pièces de jonction lorsque les dents sont emboîtées l’une dans l’autre. Il semble difficile voire impossible de poser les agrafes des pièces de jonction pour respecter le pas régulier des dents de la courroie. Ce type de jonction a l’inconvénient de verrouiller dans un même plan trois dents successives de la courroie, empêchant ainsi la courroie de s’enrouler autour des poulies et provoquant une usure rapide de la courroie. En outre, ce type de jonction empêche de créer une continuité mécanique entre l’âme de traction de la courroie et les pièces jonction, interdisant son application notamment dans le domaine du véhicule. The publication EP 1 333 193 A1 relates to a toothed belt for transporting products, closed by two junction pieces in the form of staples, provided with interlocking teeth, secured to a central layer of said belt, and assembled by a single locking rod housed in a transverse hole formed by said connecting pieces when the teeth are nested one inside the other. It seems difficult or impossible to put the staples of the joining pieces to respect the regular pitch of the teeth of the belt. This type of junction has the disadvantage of locking in the same plane three successive teeth of the belt, thus preventing the belt from wrapping around the pulleys and causing rapid wear of the belt. In addition, this type of junction prevents the creation of a mechanical continuity between the traction core of the belt and the joining parts, prohibiting its application particularly in the field of the vehicle.
La publication JP S59 77146 A propose une courroie crantée, ouverte, dont les extrémités à raccorder sont délimitées chacune par une dent et sont assemblées par une jonction démontable, sous la forme d’un étrier en U fixé par des vis vissées dans des trous prévus dans les dents. Ces trous de fixation étant situés dans les dents de la courroie sont par conséquent disposés sous la nappe de renfort. La zone de jonction obtenue a par conséquent des performances mécaniques médiocres, liées uniquement à la résistance de la matière de la courroie sans faire intervenir la nappe de renfort. En outre, elle ne permet pas de respecter le pas entre les dents desdites extrémités, le pas entre les deux dents situées dans la zone de jonction étant nécessairement inférieur au pas régulier des dents de la courroie. Ainsi, les courroies crantées actuelles et leur système de jonction associé ne donnent pas entière satisfaction, les efforts transmis étant très insuffisants et le respect du pas n’étant pas respecté. The publication JP S59 77146 A proposes an open toothed belt whose ends to be connected are each delimited by a tooth and are assembled by a detachable junction, in the form of a U-shaped stirrup fixed by screws screwed into holes provided. in the teeth. These fixing holes being located in the teeth of the belt are therefore arranged under the reinforcing ply. The junction area obtained therefore has poor mechanical performance, related only to the strength of the material of the belt without involving the reinforcing ply. In Moreover, it does not allow to respect the pitch between the teeth of said ends, the pitch between the two teeth located in the junction zone being necessarily less than the regular pitch of the teeth of the belt. Thus, the current toothed belts and their associated junction system are not entirely satisfactory, the efforts transmitted being very insufficient and the respect of the step is not respected.
Dans d’autres domaines techniques et notamment dans l’industrie, on utilise également des courroies crantées pour la transmission de puissance. Le cahier des charges est toutefois bien différent de l’application véhicule, puisque les organes de transmission sont généralement plus larges, et à titre d’exemple de l’ordre de lômm à l25mm, pour des pas de 8M (8mm) à 32M (32mm), tournent plus vite, et à titre d’exemple de l’ordre de 1500 ou 3000tr/mn en général, et engrènent des pignons de plus grand diamètre de l’ordre de 40mm à 400mm. Toutefois, dans les deux types d’application, la problématique du respect du pas entre les dents de la courroie reste identique pour pouvoir garantir un engrènement parfait avec les pignons dentés. In other technical fields and in particular in the industry, toothed belts are also used for power transmission. The specification is however very different from the vehicle application, since the transmission members are generally wider, and as an example of the order of 10mm to 25mm, for steps of 8M (8mm) to 32M ( 32mm), turn faster, and as an example of the order of 1500 or 3000rpm in general, and mesh gears of larger diameter of the order of 40mm to 400mm. However, in both types of application, the problem of the respect of the pitch between the teeth of the belt remains the same to be able to guarantee a perfect meshing with the toothed gears.
Exposé de l’invention : Presentation of the invention
La présente invention vise à pallier ces inconvénients en proposant une courroie crantée polyvalente, conçue pour de la transmission de puissance dans tout domaine d’application, ladite courroie étant équipée d’une jonction mécanique simple et rapide lui permettant d’être montée ouverte afin de permettre sa mise en place sur tout type de cadre ou de châssis fermé, ne nécessitant par conséquent plus de modification dudit cadre pour créer un passage particulièrement préjudiciable pour la résistance mécanique du cadre ou du châssis, notamment lorsque celui-ci est réalisé à base de fibres de carbone, ladite courroie crantée à jonction mécanique étant en outre tout aussi performante en termes de résistance mécanique, de souplesse et de transmission sans glissement que les courroies crantées actuelles fermées et que les chaînes traditionnelles, et pouvant être adaptée aussi bien à un guidage latéral qu’à un guidage central en fonction des poulies dentées. La présente invention vise également à proposer une courroie crantée à jonction mécanique conçue pour respecter le pas régulier entre les dents et assurer ainsi un engrènement parfait avec les pignons, dans une grande plage de pas, par exemple de 8M à 32M et dans une grande plage de largeurs de courroie, par exemple de l2mm à l25mm, permettant ainsi de couvrir toutes les applications du cycle à l’industrie, en adaptant simplement sa jonction mécanique. Dans ce but, l'invention concerne une courroie de transmission de puissance du genre indiqué en préambule, caractérisée en ce que les brins des spires ou des boucles longitudinales dudit au moins un câble de traction formant ladite âme de traction sont tous disposés côte à côte dans un même plan, sans se superposer, ce plan étant confondu avec un plan médian de la courroie correspondant à sa fibre neutre, en ce que l’axe dudit au moins un orifice transversal ou de ladite au moins une tige de verrouillage de chacune desdites extrémités est également positionné dans ledit plan médian de la courroie correspondant à sa fibre neutre, et en ce que ledit au moins un dispositif de jonction est agencé pour écarter les dents desdites extrémités dudit pas régulier ou d’un multiple dudit pas régulier. The present invention aims to overcome these disadvantages by providing a multi-purpose toothed belt, designed for power transmission in any field of application, said belt being equipped with a simple and fast mechanical joint allowing it to be mounted open in order to allow its implementation on any type of frame or closed frame, therefore no longer requiring modification of said frame to create a passage particularly detrimental to the mechanical strength of the frame or the frame, especially when it is made based on carbon fiber, said toothed belt mechanical junction being furthermore as efficient in terms of mechanical strength, flexibility and slip-free transmission as current toothed belts closed and that the traditional chains, and can be adapted to both lateral guidance and central guidance depending on the toothed pulleys. The present invention also aims to provide a toothed belt mechanical junction designed to respect the regular pitch between the teeth and thus ensure a perfect meshing with the gears, in a wide range of steps, for example from 8M to 32M and in a wide range belt widths, for example from 12mm to 25mm, thus making it possible to cover all applications of the cycle to the industry, simply by adapting its mechanical joint. For this purpose, the invention relates to a power transmission belt of the kind indicated in the preamble, characterized in that the strands of the turns or longitudinal loops of said at least one tensile cable forming said tensile core are all arranged side by side. in the same plane, without being superimposed, this plane coinciding with a median plane of the belt corresponding to its neutral fiber, in that the axis of said at least one transverse orifice or of said at least one locking rod of each of said ends is also positioned in said median plane of the belt corresponding to its neutral fiber, and in that said at least one junction device is arranged to separate the teeth of said ends of said regular pitch or a multiple of said regular pitch.
Dans une première forme de réalisation, ledit au moins un dispositif de jonction peut comporter au moins un maillon de liaison pourvu de deux œillets d’axes parallèles, distants dudit pas régulier, et au moins une tige de verrouillage amovible, et ledit au moins un tronçon de bande peut comporter au moins un orifice transversal dans au moins une desdites extrémités pour accueillir ladite au moins une tige de verrouillage amovible. Dans ce cas, un des côtés dudit au moins un maillon de liaison peut être solidaire d’une des extrémités dudit tronçon de bande par une tige de verrouillage fixe. Ledit au moins un dispositif de jonction peut aussi comporter deux tiges de verrouillage amovibles, et ledit au moins un tronçon de bande peut alors comporter un orifice transversal dans chacune desdites extrémités pour accueillir lesdites tiges de verrouillage amovibles. Dans certaines formes de réalisation, les deux tiges de verrouillage amovibles peuvent être solidaires d’un des maillons de liaison. In a first embodiment, said at least one joining device may comprise at least one connecting link provided with two eyelets with parallel axes, spaced from said regular pitch, and at least one removable locking rod, and said at least one strip section may comprise at least one transverse orifice in at least one of said ends to accommodate said at least one removable locking rod. In this case, one of the sides of said at least one connecting link may be secured to one end of said band section by a fixed locking rod. Said at least one junction device may also comprise two removable locking rods, and said at least one tape section may then comprise a transverse orifice in each of said ends to accommodate said removable locking rods. In some embodiments, the two removable locking rods may be integral with one of the connecting links.
Ledit dispositif de jonction peut selon les variantes comporter deux maillons de liaison extérieurs, disposés de part et d’autre des flancs dudit tronçon de bande et alignés entre eux transversalement. Dans ce cas, les flancs dudit tronçon de bande peuvent comporter un dégagement pour loger lesdits maillons de liaison extérieurs dans la largeur dudit tronçon. Said connecting device may according to the variants comprise two outer link links, arranged on either side of the sides of said strip section and aligned with each other transversely. In this case, the flanks of said strip section may comprise a clearance for accommodating said outer link links in the width of said section.
Dans une forme de réalisation préférée de l’invention, ledit dispositif de jonction peut comporter au moins un maillon de liaison intérieur, disposé dans la largeur dudit tronçon de bande, et ledit au moins un tronçon de bande peut dans ce cas comporter dans lesdites extrémités au moins une encoche pour recevoir ledit au moins un maillon de liaison intérieur. Bien entendu, il peut comporter un nombre N de maillons de liaison intérieurs, et ledit au moins un tronçon de bande peut comporter dans lesdites extrémités un nombre N d’encoches pour recevoir lesdits maillons de liaison intérieurs. In a preferred embodiment of the invention, said junction device may comprise at least one internal link link disposed in the width of said band section, and said at least one band section may in this case comprise in said ends. at least one notch for receiving said at least one inner link link. Of course, it may comprise a number N of internal connecting links, and said at least one strip section may comprise in said ends a number N of notches for receiving said inner link links.
Dans une autre forme de réalisation, ledit au moins un dispositif de jonction peut comporter au moins deux pièces de jonction agencées pour être assemblées entre- elles par une seule tige de verrouillage amovible, et dans ce cas un côté desdites pièces de jonction peut être fixé dans chaque extrémité dudit tronçon de bande), ledit dispositif de jonction étant agencé pour écarter les dents desdites extrémités d’un multiple dudit pas régulier. In another embodiment, said at least one junction device may comprise at least two junction pieces arranged to be assembled together by a single removable locking rod, and in this case one side of said junction pieces can be fixed. in each end of said strip section), said connecting device being arranged to move the teeth of said ends a multiple of said regular pitch.
En variante, ledit au moins un dispositif de jonction peut comporter au moins un maillon à griffe ouvert et deux tiges de verrouillage fixes, ledit au moins un maillon à griffe étant pourvu de deux œillets d’axes parallèles, distants dudit pas régulier, chaque œillet étant ouvert sur une fente débouchante. Dans ce cas, chaque tige de verrouillage peut être solidaire d’une des extrémités dudit tronçon de bande. II peut aussi comporter au moins un maillon à griffe ouvert en partie et deux tiges de verrouillage fixes, ledit au moins un maillon à griffe étant pourvu de deux œillets d’axes parallèles, distants dudit pas régulier, dont un œillet est fermé et un œillet est ouvert sur une fente débouchante. Dans ce cas, une des tiges de verrouillage peut être solidaire d’une des extrémités dudit tronçon de bande et traverser l’œillet fermé dudit au moins un maillon à griffe, et l’autre tige de verrouillage peut être solidaire de l’autre desdites extrémités. As a variant, said at least one joining device may comprise at least one open claw link and two fixed locking rods, said at least one link to claw being provided with two eyelets parallel axes, spaced from said regular pitch, each eyelet being open on a slot opening. In this case, each locking rod can be secured to one end of said strip section. It may also comprise at least one partially open claw link and two fixed locking rods, said at least one claw link being provided with two eyelets of parallel axes, spaced from said regular pitch, one eyelet of which is closed and one eyelet is open on an open slot. In this case, one of the locking rods can be secured to one end of said strip section and pass through the closed eyelet of said at least one claw link, and the other locking rod can be secured to the other of said ends.
Ledit au moins un tronçon de bande peut alors comporter au moins une encoche dans lesdites extrémités pour recevoir ledit au moins un maillon à griffe. Said at least one strip section may then comprise at least one notch in said ends to receive said at least one claw link.
La courroie selon l’invention peut également comporter plusieurs tronçons de bande et plusieurs dispositifs de jonction agencés pour assembler les extrémités correspondantes desdits tronçons de bande adjacents. Description sommaire des dessins : The belt according to the invention may also comprise several strip sections and several junction devices arranged to assemble the corresponding ends of said adjacent strip sections. Brief description of the drawings:
La présente invention et ses avantages apparaîtront mieux dans la description suivante d'un mode de réalisation donné à titre d'exemple non limitatif, en référence aux dessins annexés, dans lesquels : The present invention and its advantages will appear better in the following description of an embodiment given by way of non-limiting example, with reference to the appended drawings, in which:
- la figure 1 est une vue en perspective d’une courroie de transmission de puissance selon une première variante de réalisation de l’invention, destinée plus particulièrement au domaine de l’industrie, assemblée autour de deux poulies dentées grâce à un premier dispositif de jonction, - Figure 1 is a perspective view of a power transmission belt according to a first embodiment of the invention, intended more particularly in the field of industry, assembled around two toothed pulleys with a first device of junction,
la figure 2 est une vue similaire à la figure 1 d’une courroie selon une seconde variante de réalisation de l’invention, destinée plus particulièrement au domaine du cycle, assemblée autour de deux poulies dentées grâce à un second dispositif de jonction, FIG. 2 is a view similar to FIG. 1 of a belt according to a second variant embodiment of the invention, intended more particularly for the field of cycle, assembled around two toothed pulleys by means of a second connecting device,
les figures 3 et 4 sont des vues agrandies en perspective du détail A de la figure 2 montrant la zone de jonction de la courroie dans laquelle ses deux extrémités sont assemblées par le second dispositif de jonction, respectivement en vue de dessus et en vue de dessous,  FIGS. 3 and 4 are enlarged perspective views of the detail A of FIG. 2 showing the junction zone of the belt in which its two ends are joined by the second junction device, respectively in plan view and in bottom view. ,
la figure 5 est une vue en coupe longitudinale de la zone de jonction de la courroie de la figure 3, et la figure 5A est une vue agrandie du détail B de la figure 5, la figure 6 est une vue de dessus en transparence de la courroie ouverte montrant l’âme de traction, et les figures 6A et 6B sont des vues agrandies des détails C et D de la figure 6,  FIG. 5 is a longitudinal sectional view of the junction zone of the belt of FIG. 3, and FIG. 5A is an enlarged view of detail B of FIG. 5, FIG. 6 is a top view in transparency of FIG. open belt showing the pull core, and Figs. 6A and 6B are enlarged views of details C and D of Fig. 6,
la figure 7 est une vue de dessus en transparence de la zone de jonction de la courroie fermée de la figure 6,  FIG. 7 is a top view in transparency of the junction zone of the closed belt of FIG. 6,
la figure 8 est une vue similaire à la figure 7 d’une partie de la zone de jonction de la courroie fermée de la figure 1,  FIG. 8 is a view similar to FIG. 7 of part of the junction zone of the closed belt of FIG. 1,
les figures 9 et 10 sont des vues de face d’une zone de jonction d’une courroie selon deux modes de réalisation de l’invention, montrée en position sous tension, dans laquelle le profil cranté de la courroie n’est pas déformé et le pas P est respecté, la figure 11 est une vue en perspective d’une courroie de transmission de puissance selon une troisième variante de réalisation de l’invention pour le véhicule par exemple, assemblée autour de deux poulies dentées à flasques grâce à un troisième dispositif de jonction,  FIGS. 9 and 10 are front views of a joining zone of a belt according to two embodiments of the invention, shown in tensioned position, in which the notched profile of the belt is not deformed and the pitch P is respected, Figure 11 is a perspective view of a power transmission belt according to a third embodiment of the invention for the vehicle for example, assembled around two toothed pulleys flanges with a third junction device,
la figure 12 est une vue de dessous, agrandie et en perspective, de la zone de jonction de la courroie de la figure 11,  FIG. 12 is a bottom view, enlarged and in perspective, of the junction zone of the belt of FIG. 11,
- les figures 13A et 13B sont des vues en perspective d’un maillon à griffe faisant partie du troisième dispositif de jonction, selon respectivement deux modes de réalisation, FIGS. 13A and 13B are perspective views of a claw link forming part of the third connecting device, respectively according to two embodiments,
la figure 14 est une vue en coupe longitudinale et agrandie de la zone de jonction de la courroie de la figure 11 pourvue du maillon à griffe de la figure 13 A, la figure 15 est une vue de dessus en transparence et agrandie d’une extrémité de la courroie ouverte de la figure 11 montrant l’âme de traction avec les maillons à griffe de la figure 13 A, FIG. 14 is a longitudinal and enlarged sectional view of the junction zone of the belt of FIG. 11 provided with the claw link of FIG. 13A; FIG. 15 is a top view in transparency and enlarged of one end of the open belt of FIG. 11 showing the traction core with the claw links of FIG. 13A,
la figure 16 est une vue éclatée en perspective d’un tronçon de la courroie large de la figure 1 destinée plus particulièrement au domaine de l’industrie, et  FIG. 16 is an exploded perspective view of a section of the wide belt of FIG. 1 intended more particularly for the field of industry, and
la figure 17 est une vue éclatée en perspective d’un tronçon de la courroie étroite de la figure 2 selon une autre variante de réalisation de l’invention destinée plus particulièrement au domaine du cycle. Illustrations de l’invention et différentes manières de la réaliser :  Figure 17 is an exploded perspective view of a section of the narrow belt of Figure 2 according to another embodiment of the invention intended more particularly to the field of the cycle. Illustrations of the invention and different ways of making it:
Dans les exemples de réalisation illustrés, les éléments ou parties identiques portent les mêmes numéros de référence. En référence aux figures, la courroie de transmission de puissance selon l’invention est une courroie crantée ouverte pourvue d’un dispositif de jonction mécanique permettant d’ouvrir et de fermer ladite courroie. Le dispositif de jonction est réalisé de telle sorte que, lors de la mise en tension de la courroie, aucune déformation ne modifie ni le profil cranté de la courroie, ni le pas entre les dents pour garantir son engrènement avec des pignons dentés, des poulies dentées ou des poulies crantées d’une transmission mécanique, dénommés par un terme générique « poulie » sans que ce terme ne soit limitatif. Les figures 1, 2, 11, 16 et 17 illustrent différentes variantes de réalisation d’une telle courroie de transmission 10, 100, 110, 120 ouverte, appelée par la suite « courroie », fermée en boucle par au moins un dispositif de jonction 40, 50, 60 et engrenée autour de deux poulies 1, 2 ; 1’, 2’ d’une transmission mécanique, pouvant appartenir à un véhicule, tel qu’un véhicule à deux roues, à une machine, ou à tout appareil nécessitant une transmission de puissance entre deux organes tournants. L’invention n’est bien entendu pas limitée à ce type d’application, mais s’étend à tout type de véhicules, d’engins, de machines, d’outils, d’équipements, etc. dans tout type d’applications domestiques, artisanales, industrielles, etc. nécessitant une courroie de transmission de puissance, une bande transporteuse ou similaire. Le principe de l’invention consiste à concevoir une courroie de transmission identique sur toute une plage de dimensions et d’efforts à transmettre correspondants auxdites dimensions, selon un pas pouvant aller de 8M à 32M, sur une largeur de bande de l2mm à l25mm, avec au moins une jonction mécanique adaptée à l’espace disponible pour l’application considérée. Ces valeurs ne sont données qu’à titre indicatif et ne sont pas limitatives. In the exemplary embodiments illustrated, the elements or identical parts bear the same reference numbers. Referring to the figures, the power transmission belt according to the invention is an open toothed belt provided with a mechanical connecting device for opening and closing said belt. The junction device is made in such a way that, during the tensioning of the belt, no deformation modifies neither the notched profile of the belt, nor the pitch between the teeth to ensure its meshing with toothed gears, pulleys toothed or toothed pulleys of a mechanical transmission, referred to by a generic term "pulley" without this term being limiting. FIGS. 1, 2, 11, 16 and 17 illustrate various alternative embodiments of such an open transmission belt 10, 100, 110, 120, hereinafter referred to as a "belt", closed in a loop by at least one joining device. 40, 50, 60 and geared around two pulleys 1, 2; 1 ', 2' of a mechanical transmission, which may belong to a vehicle, such as a two-wheeled vehicle, a machine, or any device requiring a power transmission between two rotating members. The invention is of course not limited to this type of application, but extends to all types of vehicles, machines, machines, tools, equipment, etc. in all types of domestic, craft applications, industrial, etc. requiring a power transmission belt, a conveyor belt or the like. The principle of the invention is to design an identical transmission belt over a range of dimensions and corresponding transmission forces corresponding to said dimensions, in a step ranging from 8M to 32M, over a bandwidth of 12mm to 25mm, with at least one mechanical junction adapted to the space available for the application in question. These values are given for information only and are not limiting.
Les poulies 1, 2 ; 1’, 2’ comportent de manière connue un profil denté formé par une succession de dents 3 séparées d’un pas P régulier, et délimitant entre elles des crans 4. Les poulies 1, 2 de la figure 2 comportent en outre une nervure centrale 5, qui est saillante dans les crans 4 pour guider transversalement la courroie 10. Ce type de guidage central est connu sous la dénomination anglaise « center track » ou « piste centrale » dans le domaine spécifique du cycle. Bien entendu, le guidage transversal de la courroie 10 n’est pas limité à ce mode de réalisation, mais s’étend à tout autre mode de guidage, tel qu’un guidage latéral par des poulies à flasques (voir figures 1 et 11). Tout autre moyen de guidage transversal réalisé par d’autres moyens, mais également l’absence de guidage peuvent convenir en fonction de l’application considérée. Le mode de réalisation illustré dans les figures 1 et 11 illustre un guidage latéral de la courroie 100, 110 par des poulies 1’, 2’ pourvus à cet effet de flasques latéraux 6. Bien entendu, il est possible de combiner les deux types de guidage central et latéral. Pulleys 1, 2; 1 ', 2' comprise in a known manner a toothed profile formed by a succession of teeth 3 separated by a regular pitch P, and delimiting between them notches 4. The pulleys 1, 2 of Figure 2 further comprise a central rib 5, which is projecting in the notches 4 for transversely guiding the belt 10. This type of central guidance is known by the English name "center track" or "central track" in the specific area of the cycle. Of course, the transverse guidance of the belt 10 is not limited to this embodiment, but extends to any other guide mode, such as lateral guidance by flanged pulleys (see FIGS. 1 and 11). . Any other means of transverse guidance made by other means, but also the absence of guidance may be appropriate depending on the application considered. The embodiment illustrated in FIGS. 1 and 11 illustrates a lateral guiding of the belt 100, 110 by pulleys 1 ', 2' provided for this purpose with lateral flanges 6. Of course, it is possible to combine the two types of belt. central and lateral guidance.
La courroie 10, 100, 110, 120 représentée comporte de manière connue une face lisse 11 et une face crantée 12 formée par une succession de crans 13 séparés d’un pas P régulier correspondant à celui des poulies 1, 2 ; 1’, 2’, et délimitant entre eux des dents 14. Bien entendu, le profil cranté de la courroie 10, 100, 110, 120 est conçu pour épouser parfaitement le profil denté des poulies 1, 2 ; 1’, 2’ afin d’assurer un engrènement sans glissement. En référence aux figures 2 à 5, la courroie 10 comporte en outre une rainure centrale 15, qui est creusée dans les dents 14 et qui est complémentaire à la nervure centrale 5 des poulies 1, 2 permettant son guidage central. Cette nervure centrale est absente dans les courroies 100, 110, 120 des figures 1, 11, 17 étant donné qu’elles peuvent être guidées par les flasques latéraux 6 des poulies , 2’. The belt 10, 100, 110, 120 shown comprises in known manner a smooth face 11 and a notched face 12 formed by a succession of notches 13 separated by a regular pitch P corresponding to that of the pulleys 1, 2; 1 ', 2', and delimiting between them teeth 14. Of course, the notched profile of the belt 10, 100, 110, 120 is designed to perfectly match the tooth profile pulleys 1, 2; 1 ', 2' to ensure a meshing without slipping. With reference to FIGS. 2 to 5, the belt 10 further comprises a central groove 15, which is hollowed out in the teeth 14 and which is complementary to the central rib 5 pulleys 1, 2 for its central guidance. This central rib is absent in the belts 100, 110, 120 of Figures 1, 11, 17 since they can be guided by the side flanges 6 of the pulleys, 2 '.
Selon le procédé de l’invention, la courroie 10, 100, 110, 120 est réalisée à partir d’au moins un tronçon 16 d’une bande de matière, appelé par la suite « tronçon de bande 16 ». Ce tronçon de bande 16 est ouvert (fig. 6) et fabriqué dans une matière synthétique, thermoplastique ou thermodurcissable, telle qu’un polyuréthane (PU), un composé de polyuréthane, un caoutchouc naturel ou synthétique type néoprène®, ou toute matière équivalente qui a des propriétés similaires, à savoir notamment légèreté, souplesse, robustesse, grande résistance à la fatigue. Le tronçon de bande 16 peut être recouvert en partie ou en totalité par un revêtement pouvant contribuer à diminuer le coefficient de friction, réduisant l’abrasion, et à diminuer le bruit, tout en augmentant la durée de vie de la courroie. Ce revêtement peut être un textile de renfort ou similaire. Ce tronçon de bande 16 peut être fabriqué par extrusion sous la forme d’une bande de matière continue, coupée à la largeur et/ou à la longueur voulue(s), ou par moulage, injection, ou thermoformage à la largeur et/ou à la longueur voulue(s). Bien entendu, toute autre technique de fabrication équivalente peut convenir. Il est terminé par deux extrémités 17, 18. Ces deux extrémités 17, 18 sont droites et perpendiculaires à l’axe longitudinal dudit tronçon de bande 16, avec ou sans encoche 21 comme expliqué plus loin, en fonction du type de jonction mécanique choisie. Ces deux extrémités 17, 18 comportent en outre chacune une dent 14 permettant de disposer d’une épaisseur de matière suffisante pour prévoir une liaison avec au moins un dispositif de jonction 40, 50, 60. En effet, les deux extrémités 17, 18 dudit tronçon de bande 16 sont prévues pour être assemblées par un dispositif de jonction 40, 50, 60 agencé pour être au moins en partie démontable. Bien entendu, si la courroie 10, 100, 110, 120 est réalisée à partir de plusieurs tronçons de bande 16, il faudra prévoir plusieurs dispositifs de jonction 40, 50, 60 pour assembler les tronçons entre eux, au moins un nombre N de dispositifs de jonction40, 50, 60 égal au nombre N de tronçons de bande 16. Le dispositif de jonction40, 50, 60 est conçu et dimensionné pour garantir un écartement des dents 14 prévues aux deux extrémités 17, 18 du pas P régulier ou d’un multiple du pas P régulier, afin d’assurer l’engrenage de la courroie 10, 100, 110, 120 avec les poulies 1, 2 ; 1’, 2’. Il est également conçu pour être démontable au moins en partie pour pouvoir ouvrir et fermer la courroie 10, 100, 110, 120 afin qu’elle puisse adopter deux états d’utilisation : un état ouvert (fig. 6 ; 15, 16, 17) dans lequel les extrémités 17, 18 du tronçon de bande 16 ne sont pas assemblées, et un état fermé (fig. 1 à 4 ; 11 et 12) dans lequel les extrémités 17, 18 du tronçon de bande 16 sont assemblées par le dispositif de jonction 40, 50, 60. Le dispositif de jonction40, 50, 60 selon l’invention comporte, selon les modes de réalisation, des maillons ouverts ou fermés, et des tiges de verrouillage fixes ou amovibles, disposées transversalement dans les extrémités 17, 18 du tronçon de bande 16. On appelle « tige de verrouillage », un axe de préférence métallique, fixe ou amovible, de section cylindrique ou non, de surface lisse, filetée, ou crantée, avec ou sans tête, en une seule partie ou en deux parties montées tête-bêche, ces exemples n’étant pas limitatifs. According to the method of the invention, the belt 10, 100, 110, 120 is made from at least one section 16 of a strip of material, hereinafter called "strip section 16". This strip section 16 is open (FIG 6) and made of a synthetic material, thermoplastic or thermosetting, such as a polyurethane (PU), a polyurethane compound, a natural or synthetic rubber type neoprene®, or any equivalent material which has similar properties, namely in particular lightness, flexibility, robustness, high resistance to fatigue. The strip portion 16 may be partially or completely covered with a coating that can help reduce the coefficient of friction, reduce abrasion, and reduce noise, while increasing the life of the belt. This coating may be a reinforcing textile or the like. This strip section 16 may be manufactured by extrusion in the form of a strip of continuous material, cut to the desired width and / or length (s), or by molding, injection, or thermoforming to the width and / or to the desired length (s). Of course, any other equivalent manufacturing technique may be suitable. It is terminated by two ends 17, 18. These two ends 17, 18 are straight and perpendicular to the longitudinal axis of said strip section 16, with or without notch 21 as explained below, depending on the type of mechanical connection chosen. These two ends 17, 18 each further comprise a tooth 14 making it possible to have a sufficient thickness of material to provide a connection with at least one joining device 40, 50, 60. Indeed, the two ends 17, 18 of said strip section 16 are provided to be assembled by a junction device 40, 50, 60 arranged to be at least partly removable. Of course, if the belt 10, 100, 110, 120 is made from several strip sections 16, it will be necessary to provide several connecting devices 40, 50, 60 to assemble the sections together, at least a number N of devices of junction 40, 50, 60 equal to the number N of tape sections 16. The junction device 40, 50, 60 is designed and dimensioned to ensure a spacing of the teeth 14 provided at both ends 17, 18 of the regular pitch P or a multiple a regular pitch P, to ensure the gearing of the belt 10, 100, 110, 120 with the pulleys 1, 2; 1 ', 2'. It is also designed to be removable at least in part to open and close the belt 10, 100, 110, 120 so that it can adopt two states of use: an open state (Fig. 6; 15, 16, 17). ) in which the ends 17, 18 of the strip section 16 are not assembled, and a closed state (Figs 1 to 4; 11 and 12) in which the ends 17, 18 of the strip section 16 are assembled by the device 40, 50, 60. The junction device 40, 50, 60 according to the invention comprises, according to the embodiments, open or closed links, and fixed or removable locking rods, arranged transversely in the ends 17, 18 of the strip section 16. The term "locking rod", a preferably fixed or removable metal axis, of cylindrical or non-cylindrical section, with a smooth, threaded, or notched surface, with or without a head, in one piece or in two parts mounted upside down, these examples not being as limiting.
Dans ce but, lors de la fabrication du tronçon de bande 16 et en référence aux exemples représentés, dans les dents 14 prévues aux extrémités 17, 18, on aménage des passages ou orifices transversaux 19, qui traversent la largeur du tronçon de bande 16 de part en part pour pouvoir y accueillir la ou les tiges de verrouillage 42 appartenant aux dispositifs de jonction40, 60 des figures 1 à 8 et 17, ou on intègre la ou les tiges de verrouillage 52 appartenant au dispositif de jonction 50 des figures 11 à 16, par exemple par un procédé de surmoulage. For this purpose, during the production of the strip section 16 and with reference to the examples shown, in the teeth 14 provided at the ends 17, 18, transverse passages or orifices 19, which cross the width of the strip section 16, are arranged. partially to accommodate the locking pin or rods 42 belonging to the connecting devices 40, 60 of Figures 1 to 8 and 17, or the locking rod or rods 52 belonging to the connecting device 50 of Figures 11 to 16 is integrated for example by an overmolding process.
Dans les exemples représentés aux figures 1 à 8, le premier dispositif de jonction 40 comporte un ou plusieurs maillons de liaison 41, chaque maillon étant fermé et pourvu de deux œillets 43 d’axe parallèle et d’entraxe préférentiellement égal au pas P. Ces maillons de liaison 41 sont disposés parallèlement, dans la largeur dudit tronçon de bande 16 et sont assemblés aux extrémités 17, 18 par des tiges de verrouillage 42, qui traversent les œillets 43 et les orifices transversaux 19 alignés entre eux. Au moins une de ces tiges de verrouillage 42 est démontable et amovible pour permettre le démontage du dispositif de jonction 40 par rapport à au moins une des extrémités 17, 18 et l’ouverture du tronçon de bande 16. Les tiges de verrouillage 42 peuvent bien entendu être remplacées en partie ou en totalité par tout autre organe de verrouillage techniquement équivalent, permettant un assemblage des maillons de liaison 41 aux extrémités 17, 18 du tronçon de bande 16 par emboîtement, vissage, sertissage, agrafage, surmoulage, collage, soudage, ou tout autre procédé mécanique connu. Le dispositif de jonction 40 peut également combiner différents organes de verrouillage, l’essentiel étant qu’il soit démontable au moins d’un côté des maillons de liaison 4L In the examples represented in FIGS. 1 to 8, the first junction device 40 comprises one or more connecting links 41, each link being closed and provided with two eyelets 43 having a parallel axis and a center distance preferably equal to the pitch P. connecting links 41 are arranged parallel, in the width of said strip section 16 and are connected to the ends 17, 18 by rods of locking 42, which pass through the eyelets 43 and the transverse orifices 19 aligned with each other. At least one of these locking rods 42 is removable and removable to allow disassembly of the connecting device 40 with respect to at least one of the ends 17, 18 and the opening of the strip section 16. The locking rods 42 may well All or some of the parts may be replaced by any other technically equivalent locking member, allowing assembly of the connecting links 41 at the ends 17, 18 of the strip section 16 by interlocking, screwing, crimping, stitching, overmoulding, bonding, welding, or any other known mechanical process. The junction device 40 can also combine different locking members, the essential being that it is removable at least on one side of the connecting links 4L
Les variantes de réalisation illustrées dans le figures 1 et 2, montrent que le dispositif de jonction 40 peut comporter plusieurs maillons de liaison 41, étant précisé que le nombre de ces maillons et leur disposition dans la largeur du tronçon de bande 16 ne sont pas limitatifs et sont déterminés en fonction de la largeur de la courroie et des efforts à transmettre par ladite courroie. The variant embodiments illustrated in FIGS. 1 and 2 show that the junction device 40 may comprise several connecting links 41, it being specified that the number of these links and their arrangement in the width of the strip section 16 are not limiting. and are determined according to the width of the belt and the forces to be transmitted by said belt.
Le dispositif de jonction 40 illustré à la figure 1 est adapté à une courroie 110 large destinée notamment au domaine de l’industrie, et comporte une pluralité de maillons de liaison 41, et par exemple treize, tous logés à l’intérieur de la courroie 110, dans des encoches 21 prévues dans les deux extrémités 17, 18. Tous les maillons de liaison 41 sont assemblés par deux tiges de verrouillage 42 aux extrémités 17, 18 attenantes de la courroie 110. Le dispositif de jonction 40 illustré aux figures 2 à 4 est adapté à une courroie 10 étroite destinée notamment au domaine du cycle, et comporte trois maillons de liaison 41, dont deux maillons extérieurs plaqués sur les flancs de la courroie 20 et un maillon intérieur, ayant une position centrale et étant logé dans une encoche 21 prévue dans les deux extrémités 17, 18. Les trois maillons de liaison 41 sont assemblés aux extrémités 17, 18 attenantes de la courroie 20 par deux tiges de verrouillage 42. Plusieurs maillons de liaison 41 intérieurs peuvent bien entendu être utilisés en fonction de la largeur de la courroie afin d’optimiser la résistance mécanique par rapport au diamètre des tiges de verrouillage 42. La disposition des deux maillons de liaison4l à l’extérieur du tronçon de bande 16 impose un guidage central de la courroie 10 comme illustré à la figure 2. Bien entendu, les maillons de liaison 41 extérieurs peuvent être noyés dans la largeur du tronçon de bande 16, au même titre que les maillons intérieurs, permettant ainsi un guidage latéral de la courroie par des poulies à flasques G, 2’, comme dans la figure 17. Dans les exemples des figures 1 à 8, les maillons de liaison 41 sont constitués d’une barrette métallique, formant deux oreilles, chacune pourvue d’un œillet 43, reliées par une partie centrale rétrécie. Les maillons de liaison 41 représentés plus en détail aux figures 5 et 5 A, sont symétriques par rapport à l’axe médian vertical et asymétriques par rapport à l’axe médian horizontal passant par le centre des œillets 43 en référence à la figure 5A, sensiblement en forme de lunettes, et comportent un bord extérieur droit et un bord intérieur creux pour ménager un jeu J aussi bien avec le sommet des dents 3 qu’avec le sommet de la nervure centrale 5 prévue sur les poulies 1, 2 permettant d’éviter ainsi toute interférence ou collision. On entend par « bord extérieur », le bord des maillons disposé du côté de la face lisse 11 de la courroie 10, 110, et par « bord intérieur », le bord des maillons disposé du côté de la face crantée 12 de la courroie 10, 110. Bien entendu, la forme des maillons de liaison 41 n’est pas limitée à ces variantes mais s’étend à toute autre forme compatible avec la courroie crantée et les poulies dentées. Deux autres exemples sont illustrés et décrits en référence aux figures 11 et 17. On peut également utiliser des maillons de liaison standards disponibles dans le commerce, sous réserve d’adapter la forme et les dimensions des tiges de verrouillage 42, 52 et des orifices transversaux 19 qui les reçoivent. The junction device 40 illustrated in FIG. 1 is adapted to a wide belt 110 intended in particular for the field of industry, and comprises a plurality of connecting links 41, and for example thirteen, all housed inside the belt. 110, in notches 21 provided in the two ends 17, 18. All the connecting links 41 are assembled by two locking rods 42 at the ends 17, 18 adjacent to the belt 110. The junction device 40 illustrated in FIGS. 4 is adapted to a narrow belt 10 especially for the cycle domain, and comprises three connecting links 41, including two outer links clad on the sidewalls of the belt 20 and an inner link, having a central position and being housed in a notch 21, the three connecting links 41 are assembled to the ends 17, 18 of the adjoining belt 20 by two locking rods 42. Several link links 41 interiors may well It is understood that the width of the belt is used in order to optimize the mechanical strength with respect to the diameter of the locking rods 42. The arrangement of the two link links 41 outside the strip section 16 imposes a central guide of the belt. belt 10 as shown in Figure 2. Of course, the outer link links 41 can be embedded in the width of the strip section 16, as well as the inner links, thus allowing lateral guidance of the belt by pulleys to flanges G, 2 ', as in Figure 17. In the examples of Figures 1 to 8, the connecting links 41 consist of a metal bar, forming two ears, each provided with an eyelet 43, connected by a part central narrowed. The connecting links 41 shown in more detail in FIGS. 5 and 5A are symmetrical with respect to the vertical median axis and asymmetrical with respect to the horizontal median axis passing through the center of the eyelets 43 with reference to FIG. 5A. substantially shaped glasses, and have a straight outer edge and a hollow inner edge to provide a clearance J both with the top of the teeth 3 with the top of the central rib 5 provided on the pulleys 1, 2 allowing avoid any interference or collision. The term "outer edge", the edge of the links disposed on the side of the smooth face 11 of the belt 10, 110, and "inner edge", the edge of the links disposed on the side of the notched face 12 of the belt 10 110. Of course, the shape of the connecting links 41 is not limited to these variants but extends to any other form compatible with the toothed belt and the toothed pulleys. Two other examples are illustrated and described with reference to FIGS. 11 and 17. Standard commercially available connecting links can also be used, provided that the shape and dimensions of the locking rods 42, 52 and the transverse holes are adapted. 19 who receive them.
Dans une variante non illustrée, le dispositif de jonction peut comporter au moins deux pièces de jonction, équivalentes ou non à des maillons, destinées à être assemblées entre-elles par une seule tige de verrouillage amovible ou par tout autre organe de verrouillage techniquement équivalent pour rendre le dispositif de jonction démontable. Dans ce cas, chaque pièce de jonction est liée à une des deux extrémités 17, 18 du tronçon de bande 16, par exemple par surmoulage, sertissage, collage, soudage, etc. Elles comportent au moins un œillet ou un passage transversal pour accueillir l’unique tige de verrouillage amovible qui les relie. Dans cette variante de réalisation, le dispositif de jonction est dimensionné pour correspondre exactement à un multiple du pas P régulier, par exemple à 2xP, s’il comporte deux pièces de jonction, afin de garantir l’engrènement de la courroie crantée dans les poulies dentées. In a variant not shown, the junction device may comprise at least two connecting pieces, equivalent or not to links, intended to be assembled together by a single removable locking rod or by any other technically equivalent locking member to make the junction device removable. In this case, each junction piece is connected to one of the two ends 17, 18 of the band section 16, for example by overmolding, crimping, gluing, welding, etc. They comprise at least one eyelet or a transverse passage to accommodate the single removable locking rod which connects them. In this variant embodiment, the junction device is dimensioned to correspond exactly to a multiple of the regular pitch P, for example to 2xP, if it comprises two junction pieces, in order to guarantee the meshing of the toothed belt in the pulleys. toothed.
Dans les exemples des figures 11 à 15, le deuxième dispositif de jonction 50 comporte des maillons ouverts, appelés maillons à griffe 51, 5G illustrés en détail dans les figures 13A et 13B, qui ont l’avantage de pouvoir être montés et démontés sur des tiges de verrouillage 52 fixes et non amovibles, ce qui n’empêche pas de les utiliser avec des tiges de verrouillage 52 amovibles. Ces maillons à griffe 51, 5G sont de préférence assemblés aux extrémités 17, 18 de la bande de matière 16, par le dessous ou la face crantée 12 de la courroie 100. Ils peuvent également être assemblés par le dessus ou la face lisse 11 de la courroie 100, mais cette solution n’est pas optimale compte-tenu notamment de la forme de la courroie 100, du peu de matière disponible dans la partie supérieure de la courroie 100, de la façon dont la courroie 100 travaille en flexion et en traction, etc. Dans cette variante de réalisation, les tiges de verrouillage 52 sont avantageusement solidarisées aux extrémités 17, 18 de la courroie 100, et de préférence surmoulées pour être noyées dans la bande de matière 16. Ainsi, elles ne sont plus amovibles, comme dans le dispositif de jonction 40 précédent, où il était nécessaire de les enfiler à travers les œillets 43 et les orifices transversaux 19. Dans ce mode de réalisation, on peut privilégier des tiges de verrouillage 52 pourvues au moins partiellement d’un crantage ou similaire pour favoriser l’accrochage mécanique de la matière de la bande de matière 16 dans les zones surmoulées des tiges de verrouillage 52. Dans l’exemple représenté dans les figures 11, 12 et 15, tous les maillons à griffe 51, 5G sont logés à l’intérieur de la largeur de la courroie 100 et plus précisément dans des encoches 21 prévues à cet effet dans les extrémités 17 et 18 de la bande de matière 16. Ce type de montage permet d’une part de garantir qu’ils ne sortent pas accidentellement des tiges de verrouillage 52 par les côtés de la courroie 100, et d’autre part d’interdire tout contact avec les flasques latéraux 6 des poulies à flasques G, 2’ selon la figure 11. De plus, les maillons à griffe 51, 5G étant logés symétriquement par rapport à l’axe longitudinal de la courroie 100, ils n’interfèrent pas avec la nervure centrale 5 des poulies 1, 2 dans l’hypothèse d’un guidage central selon les figures 1 et 2. Dans l’exemple représenté dans les figures 11, 12 et 15, le dispositif de jonction 50 comporte deux maillons à griffe 51, 5G. Le nombre de maillons à griffe 51, 51’ n’est bien entendu pas limitatif et peut être égal à un ou supérieur à deux, ce nombre pouvant être pair ou impair, en fonction de la dimension transversale de la courroie 100. Si le nombre des maillons à griffe 51, 51’ est un nombre impair, alors un guidage central de la courroie 100 ne pourra plus convenir (voir fig. 1 et 16). In the examples of FIGS. 11 to 15, the second junction device 50 comprises open links, called claw links 51, 5G, which are illustrated in detail in FIGS. 13A and 13B, which have the advantage of being able to be assembled and dismounted on locking rods 52 fixed and non-removable, which does not prevent the use with removable locking rods 52. These claw links 51, 5G are preferably assembled at the ends 17, 18 of the strip of material 16, from below or the notched face 12 of the belt 100. They can also be assembled by the top or the smooth face 11 of the belt 100, but this solution is not optimal taking into account in particular the shape of the belt 100, the little material available in the upper part of the belt 100, the way the belt 100 works in bending and in traction, etc. In this embodiment, the locking rods 52 are advantageously secured to the ends 17, 18 of the belt 100, and preferably overmolded to be embedded in the material web 16. Thus, they are no longer removable, as in the device 40, where it was necessary to thread them through the eyelets 43 and the transverse orifices 19. In this embodiment, it is preferable to use locking rods 52 provided at least partially with a notch or the like to promote the mechanical fastening of the material strip material 16 in the overmolded areas of the locking rods 52. In the example shown in Figures 11, 12 and 15, all the claw links 51, 5G are housed within the width of the belt 100 and more precisely in notches 21 provided for this purpose in the ends 17 and 18 of the strip of material 16. This type of assembly allows on the one hand to ensure that they do not accidentally exit the locking rods 52 from the sides of the belt 100, and secondly to prohibit any contact with the lateral flanges 6 of the flange pulleys G, 2 'according to FIG. 11. In addition, the claw links 51, 5G being housed symmetrically with respect to the longitudinal axis of the belt 100, they do not interfere with the central rib 5 pulleys 1, 2 in the event of a central guide according to Figures 1 and 2. In the example shown in Figures 11, 12 and 15, the junction device 50 comprises two claw links 51, 5G. The number of claw links 51, 51 'is of course not limiting and may be equal to one or greater than two, this number may be even or odd, depending on the transverse dimension of the belt 100. If the number claw links 51, 51 'is an odd number, so a central guide of the belt 100 will no longer be suitable (see Figs 1 and 16).
Les figures 13A et 13B illustrent deux exemples de maillons à griffe 51, 51’ compatibles. Dans le premier exemple, le maillon à griffe 51 selon la figure 13A est constitué d’une barrette métallique, formant deux oreilles, reliées par une partie centrale rétrécie. Chaque oreille comporte un œillet 53 ouvert sur une fente 54 débouchant dans le bord supérieur du maillon à griffe 51, les deux œillets 53 ouverts ayant des axes parallèles et un entraxe préférentiellement égal au pas P. Les fentes 54 sont par ailleurs légèrement inclinées l’une vers l’autre, suivant un axe A par rapport à l’axe vertical en référence à la figure 14, de sorte que leurs axes A se croisent au- delà du bord supérieur du maillon à griffe 51. Ainsi, les fentes 54 délimitent avec l’extrémité correspondante des oreilles, une sorte de griffe 55 favorisant un verrouillage automatique du maillon à griffe 51, lorsqu’il est emboîté sur les tiges de verrouillage 52, et évitant toute sortie accidentelle du maillon à griffe 51. Le verrouillage est également obtenu grâce à la tension exercée sur la courroie qui bloque le maillon à griffe 51 grâce à rinclinaison des griffes 55. Le maillon à griffe 51 est symétrique par rapport à son axe médian vertical et asymétrique par rapport à un axe médian horizontal passant par le centre des œillets 53 en référence à la figure 14. Il a sensiblement une forme de lunettes, et comporte un bord extérieur droit et un bord intérieur creux pour ménager un jeu J avec le sommet des dents 3 prévues sur les poulies G, 2’ permettant d’éviter ainsi toute interférence ou collision. Figures 13A and 13B illustrate two examples of claw links 51, 51 'compatible. In the first example, the claw link 51 according to Figure 13A consists of a metal bar, forming two ears, connected by a narrowed central portion. Each ear has an eyelet 53 open on a slot 54 opening into the upper edge of the claw link 51, the two open eyes 53 having parallel axes and a spacing preferably equal to the pitch P. The slots 54 are also slightly inclined. one towards the other, along an axis A with respect to the vertical axis with reference to FIG. 14, so that their axes A intersect beyond the upper edge of the claw link 51. Thus, the slots 54 delimit with the corresponding end of the ears, a kind of claw 55 promoting an automatic locking of the claw link 51, when it is fitted on the locking rods 52, and avoiding any accidental release of the claw link 51. The locking is also obtained thanks to the tension exerted on the belt which blocks the claw link 51 by means of the claws 55. The claw link 51 is symmetrical relative to its vertical median axis and asymmetrical with respect to a horizontal median axis passing through. by the center of the eyelets 53 with reference to Figure 14. It has substantially a shape of glasses, and has a straight outer edge and a hollow inner edge to provide a clearance J with the top of the teeth 3 provided on the pulleys G, 2 thus avoiding any interference or collision.
Dans le second exemple, le maillon à griffe 51’ selon la figure 13B diffère du premier exemple, par le fait qu’il comporte dans une des oreilles, un œillet 53’ fermé, et dans l’autre oreille, un œillet 53 ouvert sur une fente 54 délimitant une griffe 55. Cette forme de réalisation, associée à des tiges de verrouillage 52 fixes, impose d’intégrer, dans une des extrémités 17, 18 de la bande de matière 16, le côté du maillon à griffe 51’ comportant l’œillet 53’ fermé, traversée par une des tiges de verrouillage 52, pour lier le côté correspondant du maillon à griffe 51’ à l’extrémitéIn the second example, the claw link 51 'according to FIG. 13B differs from the first example in that it has in one of the ears a closed eyelet 53', and in the other ear an eyelet 53 open on a slot 54 delimiting a claw 55. This embodiment, associated with fixed locking rods 52, makes it necessary to integrate, in one of the ends 17, 18 of the strip of material 16, the side of the claw link 51 'comprising the eye 53 'closed, traversed by one of the locking rods 52, to bind the corresponding side of the claw link 51' at the end
17 ou 18 de la bande de matière 16. Bien entendu, la forme des maillons à griffe 51, 51’ n’est pas limitée à ces modes de réalisation, mais s’étend à toute autre forme compatible avec la courroie crantée et les poulies dentées. La figure 16 est une vue agrandie partielle du dispositif de jonction 40 de la figure 1 adapté pour une courroie 110 dite large par rapport aux autres courroies 10, 100 120, destinée notamment au domaine de l’industrie. Ce dispositif de jonction 40 comporte une pluralité de maillons de liaison 41, dans l’exemple représenté treize maillons, répartis à intervalle régulier dans la largeur de la courroie 110. Les maillons de liaison 41 sont tous logés à l’intérieur de la courroie 110 dans des encoches 21 prévues à cet effet dans les extrémités 17 et 18 de la bande de matière 16. Par faciliter les opérations d’ouverture et de fermeture de la courroie 110, tous les maillons de liaison 41 sont liés par l’un de leurs côtés à une des extrémités 17 de la bande de matière 16, via une tige de verrouillage 42 fixe. Une autre tige de verrouillage 42, qui est amovible, permet en une seule opération de lier mécaniquement le coté libre des maillons de liaison 41 à l’autre extrémité 18 de la bande de matière 16 après les avoir emboîté dans les encoches 21 correspondantes. Bien entendu, il est également possible d’utiliser un dispositif de jonction 50. Dans ce cas, les deux tiges de verrouillage 52 sont solidarisées aux extrémités 17 et 18 de la bande de matière 16 pour pouvoir y monter par emboîtement les maillons à griffe 51 , 5 G en référence aux figures 11 à 15. Si l’on opte pour les maillons à griffe 5G, ouverts en partie, ceux-ci pourront être solidarisés dans une des extrémités 17, 18 de la courroie 110 et aucune pièce de jonction ne pourra se perdre. La figure 17 illustre un autre exemple de courroie 120 dite étroite, destinée notamment au domaine du cycle, fermée par un troisième dispositif de jonction 60. Ce dispositif de jonction 60 comporte trois maillons de liaison 61, 61’, dont deux maillons 61 qui peuvent être similaires aux maillons 41, et un maillon 61’ qui forme un maillon de verrouillage puisqu’il comporte de manière intégrée deux tiges de verrouillage 62. En outre, les flancs de la bande de matière 16 comportent un dégagement 121 au droit de la zone de jonction pour pouvoir loger deux maillons de liaison 61, 61’ extérieurs dans la largeur de la courroie 120, et un maillon de liaison 61 intérieur dans les encoches 21 correspondantes. L’assemblage des extrémités 17 et 18 de la bande de matière 16 pour fermer la courroie 120 est rapide puisque la mise en place du troisième maillon de liaison 61’ permet de lier et de verrouiller les deux autres maillons de liaison 61 auxdites extrémités 17, 18 grâce aux tiges de verrouillage 62 intégrées. Bien entendu, le nombre de maillons de liaison 61, 61’ n’est pas limité et peut être égal à deux ou supérieur à trois en fonction de la largeur de la courroie et des efforts à transmettre. Bien entendu, il est possible d’utiliser tout autre type de maillon à assemblage rapide tels que ceux utilisés notamment dans le domaine du cycle. 17 or 18 of the strip of material 16. Of course, the shape of the claw links 51, 51 'is not limited to these embodiments, but extends to any other form compatible with the toothed belt and pulleys toothed. Figure 16 is a partial enlarged view of the connecting device 40 of Figure 1 adapted for a belt 110 said wide relative to the other belts 10, 100 120, intended in particular in the field of industry. This junction device 40 comprises a plurality of connecting links 41, in the example represented thirteen links, distributed at regular intervals in the width of the belt 110. The connecting links 41 are all housed inside the belt 110. in notches 21 provided for this purpose in the ends 17 and 18 of the strip of material 16. To facilitate the opening and closing operations of the belt 110, all the connecting links 41 are connected by one of their sides at one end 17 of the strip of material 16, via a locking pin 42 fixed. Another locking rod 42, which is removable, allows in a single operation to mechanically link the free side of the connecting links 41 at the other end 18 of the strip of material 16 after having fitted them into the corresponding notches 21. Of course, it is also possible to use a junction device 50. In this case, the two locking rods 52 are secured to the ends 17 and 18 of the strip of material 16 in order to fit the claw links 51 by fitting therein. , 5 G with reference to Figures 11 to 15. If one opts for 5G open claw links, in part, they can be secured in one end 17, 18 of the belt 110 and no junction piece can be lost. FIG. 17 illustrates another example of a so-called narrow belt 120, intended in particular for the cycle domain, closed by a third junction device 60. This junction device 60 comprises three connecting links 61, 61 ', including two links 61 which can similar to the links 41, and a link 61 'which forms a locking link since it comprises in an integrated manner two locking rods 62. In addition, the flanks of the material strip 16 comprise a clearance 121 at the right of the zone. connecting junction to accommodate two link links 61, 61 'outside the width of the belt 120, and an inner link link 61 in the corresponding notches 21. The assembly of the ends 17 and 18 of the strip of material 16 to close the belt 120 is fast since the establishment of the third connecting link 61 'makes it possible to bind and lock the two other links 61 to said ends 17, 18 thanks to the integrated locking rods 62. Of course, the number of connecting links 61, 61 'is not limited and may be two or more than three depending on the width of the belt and the forces to be transmitted. Of course, it is possible to use any other type of rapid assembly link such as those used in particular in the field of the cycle.
Ces différentes variantes de réalisation permettent d’illustrer quelques exemples de la diversité de dispositifs de jonction qu’il est possible d’utiliser pour assembler de manière démontable les extrémités 17 et 18 d’une courroie 10, 100, 110, 120, étant précisé que ces exemples ne sont pas limitatifs. Il est bien entendu possible de combiner les différentes variantes de réalisation des dispositifs de jonction 40, 50, 60 entre eux dans toutes les courroies 10, 100, 110, 120 illustrées. La courroie 10, 100, 110, 120 selon l’invention est en outre renforcée par l’ajout d’une âme de traction 22 noyée dans l’épaisseur du tronçon de bande 16 et s’étendant longitudinalement entre les deux extrémités 17, 18 (fig. 6), conférant à ladite courroie 10, 100, 110, 120 des performances accrues en termes de résistance à la traction et de stabilité dimensionnelle, propriétés indispensables pour la transmission d’efforts sans glissement. Le principe de construction d’une âme de traction est notamment décrit dans la publication EP 2 949 965 Bl. Dans l’exemple représenté aux figures 6, 6A et 6B, l’âme de traction 22 est constituée d’un unique câble de traction 23, circulant d’une extrémité 17 à l’autre extrémité 18, enroulé en spires autour des orifices transversaux 19 ou des tiges de verrouillage 42, 52 si elles sont intégrées par collage, surmoulage ou similaire, dans l’une et/ou l’autre desdites extrémités 17, 18, sans que ces exemples ne soient limitatifs. On entend par « orifices transversaux 19 » des passages pour recevoir aussi bien des tiges de verrouillage 42, 52 qu’un côté d’un maillon de liaison 41, d’un maillon à griffe 51, 51’, ou d’une pièce de jonction intégrée par collage, surmoulage ou similaire, dans ladite extrémité 17, 18. Dans une variante non représentée, l’âme de traction 22 peut être constituée de plusieurs câbles de traction, chacun enroulé en boucle ouverte ou fermée entre les deux extrémités 17, 18, autour desdits orifices transversaux 19 ou des tiges de verrouillage 42, 52. Toute autre construction d’une âme de traction équivalente peut convenir. Les spires ou les boucles formées par le ou les câbles de traction 23 peuvent être réparties dans la largeur du tronçon de bande 16 régulièrement ou irrégulièrement comme dans les courroies 10, 100, 110, 120 pour tenir compte de l’encoche 21 ou des encoches 21. Là encore, la façon de répartir les spires ou les boucles du ou des câbles de traction 23 dans la largeur du tronçon de bande 16 peut varier en fonction du cahier des charges de chaque courroie 10, 100, 110, 120. Le fait d’assembler les extrémités 17, 18 du tronçon de bande 16 par des maillons de liaison 41, 61, 61’ ou des maillons à griffe 51, 5 qui sont rapportés, permet d’optimiser la densité de câbles de traction 23 de l’âme de traction 22 par rapport au dispositif de jonction décrit dans la publication EP 2 949 965 Bl, et permet d’obtenir ainsi un niveau de résistance à la traction nettement supérieur à celui de l’art antérieur puisque ces câbles ne sont plus coupés. En outre, ce type d’assemblage a l’avantage de conserver l’intégrité de la courroie 10, 100, 110, 120 qui ne comporte ainsi aucune soudure, ni aucune amorce de rupture, contrairement à l’art antérieur cité. These various embodiments illustrate a few examples of the diversity of connecting devices that can be used to removably assemble the ends 17 and 18 of a belt 10, 100, 110, 120, being clarified that these examples are not limiting. It is of course possible to combine the various embodiments of the junction devices 40, 50, 60 together in all the belts 10, 100, 110, 120 illustrated. The belt 10, 100, 110, 120 according to the invention is furthermore reinforced by adding a traction core 22 embedded in the thickness of the strip section 16 and extending longitudinally between the two ends 17, 18 (FIG 6), conferring on said belt 10, 100, 110, 120 increased performance in terms of tensile strength and dimensional stability, properties essential for the transmission of forces without slip. The principle of construction of a tensile core is described in particular in EP 2 949 965 B1. In the example shown in FIGS. 6, 6A and 6B, the traction core 22 consists of a single traction cable. 23, circulating from one end 17 to the other end 18, wound in turns around the transverse orifices 19 or locking rods 42, 52 if they are integrated by gluing, overmoulding or the like, into one and / or other of said ends 17, 18, without these examples being limiting. By "transverse orifices 19" is meant passages for receiving locking rods 42, 52 as well as a side of a connecting link 41, a claw link 51, 51 ', or a piece of integrated junction by gluing, overmolding or the like, in said end 17, 18. In a variant not shown, the tensile core 22 may consist of several traction cables, each wound in an open or closed loop between the two ends 17, 18, around said transverse orifices 19 or locking rods 42, 52. Any other construction of an equivalent tensile core may be suitable. The turns or loops formed by the traction cable or cables 23 may be distributed in the width of the strip section 16 regularly or irregularly as in the belts 10, 100, 110, 120 to take account of the notch 21 or the notches 21. Again, the manner of distributing the turns or loops of the traction cable or cables 23 in the width of the strip section 16 may vary according to the specifications of each belt 10, 100, 110, 120. The fact to assemble the ends 17, 18 of the strip section 16 by connecting links 41, 61, 61 'or links to claw 51, 5 which is reported, optimizes the density of traction cables 23 of the traction core 22 with respect to the connecting device described in the publication EP 2 949 965 B1, and thus provides a level of tensile strength significantly higher than that of the prior art since these cables are no longer cut. In addition, this type of assembly has the advantage of maintaining the integrity of the belt 10, 100, 110, 120 which thus does not include any welding or breaking primer, contrary to the prior art cited.
L’âme de traction 22 est disposée impérativement au centre de l’épaisseur du tronçon de bande 16, plus particulièrement dans un plan médian de ladite courroie qui correspond à la fibre neutre de la courroie 10, 100, 110, 120, juste au-dessus de la face crantée 12 (fig. 9 et 10). On appelle « fibre neutre », le plan médian dans lequel la longueur des fibres est invariable quelle que soit le rayon de courbure de la courroie. Pour atteindre cet objectif, les brins 24 des spires ou boucles longitudinales du ou des câbles de traction 23 sont tous disposés côte à côte dans un même plan, sans se superposer, ce plan étant confondu avec ladite fibre neutre de la courroie. Ainsi, la longueur des brins 24 de l’âme de traction 22 est également invariable quelle que soit le rayon de courbure de ladite courroie. On entend par « âme de traction 22 », un ou plusieurs fils ou câbles, individuels ou assemblés en toron ou en nappe, torsadés, tressés ou tissés, en matières textiles et/ou métalliques. Dans une variante non représentée, les spires longitudinales de l’âme de traction 22 pourraient être assemblées entre elles par une trame transversale formant avec elles un treillis. Cette âme de traction 22 doit adhérer à la matière thermoplastique ou thermodurcissable du tronçon de bande 16 et présenter une excellente résistance à la traction, une grande souplesse, un allongement minimum voire nul, une bonne résistance à la flexion. On privilégiera les filaments continus synthétiques aux fils métalliques, sans que cet exemple ne soit limitatif. On peut citer, à titre d’exemple, les matières suivantes : les fibres en Kevlar®, carbone, acier, inox, sans que cette liste ne soit limitative. Ainsi, lorsque le tronçon de bande 16 est fermé en boucle par assemblage de ses extrémités 17, 18 au moyen des maillons de liaison4l, 61, 61’ et des tiges de verrouillage 42, 62 amovibles, ou des maillons à griffe 51, 5 emboîtés sur des tiges de verrouillage 52 fixes, les boucles formées par l’âme de traction 22 autour des orifices transversaux 19 à l’intérieur de chaque extrémité 17, 18 sont également verrouillées entre elles par les tiges de verrouillage 42, 52, 62. Le résultat de cette construction originale est l’obtention d’une jonction mécaniquement très résistante, notamment en traction dans l’axe longitudinal de la courroie 10, 100, 110, 120, tout en restant très souple en flexion pour garantir une bonne résistance à la fatigue et un bon enroulement de ladite courroie 10, 100, 110, 120 autour des poulies 1, 2 ; 1’, 2’, quel que soit le diamètre des poulies. The traction core 22 is imperatively disposed in the center of the thickness of the strip section 16, more particularly in a median plane of said belt which corresponds to the neutral fiber of the belt 10, 100, 110, 120, just above above the notched face 12 (Figures 9 and 10). The term "neutral fiber" is the median plane in which the length of the fibers is invariable regardless of the radius of curvature of the belt. To achieve this objective, the strands 24 of the turns or longitudinal loops of the traction cable or cables 23 are all arranged side by side in the same plane, without being superimposed, this plane being coincident with said neutral fiber of the belt. Thus, the length of the strands 24 of the traction core 22 is also invariable regardless of the radius of curvature of said belt. The term "traction core 22" means one or more son or cables, individual or assembled twisted or twisted braided or plaited or woven, of textile and / or metal. In a variant not shown, the longitudinal turns of the traction core 22 could be assembled together by a transverse frame forming with them a lattice. This traction core 22 must adhere to the thermoplastic or thermosetting material of the strip section 16 and have excellent tensile strength, high flexibility, minimum elongation or even zero, good resistance to bending. Synthetic continuous filaments will be preferred to metal wires, without this example being limiting. By way of example, mention may be made of the following materials: Kevlar®, carbon, steel and stainless steel fibers, without this list being limiting. Thus, when the strip section 16 is closed in a loop by assembling its ends 17, 18 by means of connecting links 41, 61, 61 'and locking rods 42, 62 removable, or claw links 51, 5 nested on fixed locking rods 52, the loops formed by the traction core 22 around the transverse orifices 19 inside each end 17, 18 are also locked together by the locking rods 42, 52, 62. The result of this original construction is the obtaining of a mechanically very strong junction, in particular in traction in the longitudinal axis of the belt 10, 100, 110, 120, while remaining very flexible in flexion to guarantee a good resistance to fatigue. fatigue and good winding of said belt 10, 100, 110, 120 around the pulleys 1, 2; 1 ', 2', regardless of the diameter of the pulleys.
Lors de la mise en tension de la courroie 10, 100, 110, 120 selon l’invention, elle ne doit subir aucune déformation dans sa zone de jonction qui risquerait de modifier le pas P avec comme conséquence de détruire la courroie 10, 100, 110, 120 en quelques tours puisqu’elle n’engrènerait plus correctement les poulies 1, 2 ; 1’, 2’. Ainsi, la position des orifices transversaux 19 ou des tiges de verrouillage 42, 52, 62 dans les extrémités 17, 18 du tronçon de bande 16 est déterminante, tout comme la position de l’âme de traction 22. La solution de l’invention consiste à positionner ou aligner l’axe des orifices transversaux 19 ou des tiges de verrouillage 42, 52, 62 dans le même plan que l’âme de traction 22, ce plan étant confondu avec le plan médian de la courroie qui correspond à la fibre neutre de la courroie, conformément aux figures 9 et 10. En fonction de l’épaisseur de la bande de matière 16 et du diamètre des tiges de verrouillage, ce positionnement peut nécessiter d’épaissir le tronçon de bande 16 pour noyer le câble de traction 23 enroulé autour des orifices transversaux 19 ou des tiges de verrouillage 42, 52, 62. Néanmoins, cet ajout de matière a pour effet d’augmenter le poids de la courroie et surtout sa rigidité en flexion qui réduit son rayon de courbure. Pour éviter ces inconvénients, l’augmentation de matière peut être avantageusement limitée aux extrémités 17, 18 du tronçon de bande 16 en créant un bourrelet 25 au-dessus de chacune des dents 14 d’extrémité. Cette surépaisseur située du côté extérieur de la courroie 10 n’est pas préjudiciable au bon fonctionnement de la transmission. En effet, la face lisse 11 de la courroie 10, 100, 110, 120 est généralement destinée à coopérer avec un galet tendeur (non représenté), lequel est assujetti à un organe de rappel afin d’assurer une tension uniforme dans toute la courroie. Ce galet tendeur permet ainsi de compenser toute variation d’épaisseur de la courroie, notamment au passage du dispositif de jonction 40, 50, 60 et des bourrelets 25 d’extrémité. Notons que le bord extérieur des maillons 41, 61 assure une continuité entre les deux bourrelets 25. La face lisse 11 peut en outre comporter ou non des rebords 26 longitudinaux permettant de contribuer au guidage transversal de la courroie 10 100, 110, 120. Ces rebords 26 longitudinaux sont visibles sur les figures 3, 4 et 5. Bien entendu, le nombre de rebords 26 longitudinaux peut être supérieur à deux en fonction de la largeur des courroies 10, 100, 110, 120 et peuvent assurer un contact continu avec un galet tendeur. Dans une variante de réalisation non représentée, ces rebords 26 longitudinaux pourraient être remplacés par des nervures transversales rapprochées, qui assureraient un contact presque continu avec un galet tendeur, tout en limitant la rigidité en flexion de ladite courroie 10, 100, 110, 120. Possibilités d’application industrielle : When tensioning the belt 10, 100, 110, 120 according to the invention, it must not undergo any deformation in its junction zone which could change the pitch P with the consequence of destroying the belt 10, 100, 110, 120 in a few turns since it would not mesh properly pulleys 1, 2; 1 ', 2'. Thus, the position of the transverse orifices 19 or locking rods 42, 52, 62 in the ends 17, 18 of the strip section 16 is decisive, as is the position of the traction core 22. The solution of the invention consists in positioning or aligning the axis of the transverse orifices 19 or locking rods 42, 52, 62 in the same plane as the traction core 22, this plane coinciding with the median plane of the belt which corresponds to the fiber according to FIGS. 9 and 10. Depending on the thickness of the strip of material 16 and the diameter of the locking rods, this positioning may necessitate thickening the strip section 16 to embed the towing cable. 23 wound around the transverse orifices 19 or locking rods 42, 52, 62. Nevertheless, this addition of material has the effect of increasing the weight of the belt and especially its bending stiffness which reduces its radius of curvature. To avoid these disadvantages, the material increase can be advantageously limited to the ends 17, 18 of the strip section 16 by creating a bead 25 above each of the end teeth 14. This extra thickness located on the outer side of the belt 10 is not detrimental to the proper operation of the transmission. Indeed, the smooth face 11 of the belt 10, 100, 110, 120 is generally intended to cooperate with a tensioner roller (not shown), which is subject to a return member to ensure a uniform tension throughout the belt . This tensioner roller thus makes it possible to compensate for any variation in the thickness of the belt, in particular when the junction device 40, 50, 60 and the end beads 25 pass. Note that the outer edge of the links 41, 61 provides continuity between the two beads 25. The smooth face 11 may further comprise or not longitudinal flanges 26 to contribute to the transverse guidance of the belt 100, 110, 120. These longitudinal flanges 26 are visible in FIGS. 3, 4 and 5. Of course, the number of longitudinal flanges 26 may be greater than two depending on the width of the belts 10, 100, 110, 120 and can ensure continuous contact with a tensioner. In an alternative embodiment not shown, these longitudinal flanges 26 could be replaced by close transverse ribs, which would ensure almost continuous contact with a tensioner roller, while limiting the bending stiffness of said belt 10, 100, 110, 120. Possibilities of industrial application:
Dans le cas d’une courroie 10, 100, 110, 120 renforcée, chaque tronçon de bande 16 ouvert est fabriqué, de préférence, selon un procédé simple de moulage dans une empreinte qui correspond au format et au profil de la courroie 10, 100, 110, 120 pour l’application à laquelle elle est destinée. Dans une première variante de réalisation, on peut disposer dans l’empreinte deux broches transversales dans les deux zones d’extrémité destinées à former les extrémités 17, 18 dudit tronçon de bande 16, pour créer les orifices transversaux 19, en prenant soin de positionner les axes desdites broches dans le plan médian de la courroie qui correspondra à sa fibre neutre. On dépose l’âme de traction 22 dans l’empreinte, par exemple selon le schéma illustré à la figure 6, en partant d’un bord longitudinal de l’empreinte et en décrivant des spires longitudinales d’une broche transversale à l’autre broche transversale pour arriver à l’autre bord longitudinal de l’empreinte. On forme ainsi des spires autour des broches transversales qui délimitent les orifices transversaux 19 aménagés dans la dent 14 de chaque extrémité 17, 18. Comme expliqué précédemment, tout autre procédé de construction de l’âme de traction 22 peut convenir. L’âme de traction 22 forme ainsi à l’intérieur de l’empreinte une nappe de traction, dans laquelle tous les brins 24 des spires longitudinales sont situés dans un même plan longitudinal, qui sera confondu avec le plan médian de la courroie correspondant à sa fibre neutre. Après avoir positionné l’âme de traction 22, on ajoute la matière thermoplastique dans l’empreinte pour former le tronçon de bande 16 qui formera la courroie 10, 120. On peut mettre l’empreinte remplie sous presse chauffante si nécessaire. Pour démouler le tronçon de bande 16 obtenu, on retire préalablement les deux broches transversales. Lorsque le tronçon de bande 16 sort de fabrication, l’une au moins de ses extrémités 17, 18 peut être assemblée aux maillons de liaison 41 du dispositif de jonction 40 correspondant avec une première tige de verrouillage 42, l’autre tige de verrouillage 42 étant introduite dans les œillets 43 en attente. Il peut également être assemblé pour former une courroie 10, 120 fermée en introduisant les deux tiges de verrouillage 42, 62 dans les œillets 43, 63 des maillons de liaison 41, 61, 61’ et les orifices transversaux 19 des deux extrémités 17, 18. La courroie 10, 120 obtenue peut être stockée, transportée, etc. soit dans son état ouvert, soit dans son état fermé. In the case of a reinforced belt 10, 100, 110, 120, each section of open strip 16 is preferably manufactured by a simple molding process in an imprint which corresponds to the size and profile of the belt 10, 100 , 110, 120 for the application for which it is intended. In a first embodiment, two transverse pins may be placed in the cavity in the two end zones intended to form the ends 17, 18 of said strip section 16, to create the transverse orifices 19, taking care to position the axes of said pins in the median plane of the belt which will correspond to its neutral fiber. The traction core 22 is deposited in the cavity, for example according to the diagram illustrated in FIG. Figure 6, starting from a longitudinal edge of the impression and describing longitudinal turns of a transverse pin to the other transverse pin to reach the other longitudinal edge of the footprint. Thus, turns are formed around the transverse pins which delimit the transverse orifices 19 arranged in the tooth 14 of each end 17, 18. As explained above, any other method of construction of the traction core 22 may be suitable. The traction core 22 thus forms inside the footprint a traction sheet, in which all the strands 24 of the longitudinal turns are situated in the same longitudinal plane, which will be merged with the median plane of the belt corresponding to its neutral fiber. After positioning the tensile core 22, the thermoplastic material is added in the cavity to form the strip section 16 which will form the belt 10, 120. The filled cavity can be placed in a heating press if necessary. To unmold the strip section 16 obtained, the two transverse pins are removed beforehand. When the strip section 16 comes out of manufacture, at least one of its ends 17, 18 can be assembled to the connecting links 41 of the junction device 40 corresponding with a first locking rod 42, the other locking rod 42 being introduced into the eyelets 43 on hold. It can also be assembled to form a belt 10, 120 closed by introducing the two locking rods 42, 62 into the eyelets 43, 63 of the connecting links 41, 61, 61 'and the transverse orifices 19 of the two ends 17, 18 The belt 10, 120 obtained can be stored, transported, etc. either in its open state or in its closed state.
Dans une autre variante de réalisation selon les figures 1 et 16, on peut disposer dans l’empreinte une seule broche transversale dans une des deux zones d’extrémité destinée à former une des extrémités 17, 18 dudit tronçon de bande 16, pour créer un orifice transversal 19. Puis on peut disposer dans la zone d’extrémité opposée, un côté du ou des maillons de liaison 41 correspondant au dispositif de jonction 40, et une tige de verrouillage 42 introduite dans les œillets 43 correspondants de ces maillons, pour que l’ensemble soit directement surmoulé avec le tronçon de bande 16 dans l’une de ses extrémités 17, 18. Dans cette forme de réalisation, le dispositif de jonction 40 ne comportera qu’une seule tige de verrouillage 42 amovible, permettant son démontage du côté de l’extrémité 17, 18 restée libre. L’assemblage des deux extrémités 17, 18 pour fermer la courroiel lO ne nécessitera ainsi que l’introduction de cette unique tige de verrouillage 42 amovible dans les œillets 43 en attente et dans l’orifice transversal 19 de ladite extrémité 17, 18 libre. In another variant embodiment according to FIGS. 1 and 16, it is possible to have in the cavity a single transverse pin in one of the two end zones intended to form one of the ends 17, 18 of said strip section 16, to create a transverse orifice 19. Then one side of the connecting link or links 41 corresponding to the junction device 40 can be arranged in the opposite end zone, and a locking rod 42 inserted into the corresponding eyelets 43 of these links, so that the assembly is directly overmoulded with the band section 16 in one of its ends 17, 18. In this embodiment, the device junction 40 will comprise only one removable locking rod 42, allowing its disassembly on the side of the end 17, 18 remained free. The assembly of the two ends 17, 18 to close the belt 10 will thus require only the introduction of this single removable locking rod 42 in the eyelets 43 and waiting in the transverse hole 19 of said end 17, 18 free.
En référence à la variante non illustrée dans laquelle le dispositif de jonction peut comporter au moins deux pièces de jonction, assemblées entre elles par une seule tige de verrouillage amovible, on peut disposer dans chaque zone d’extrémité de l’empreinte, un côté d’une pièce de jonction pour qu’il soit directement surmoulé avec l’extrémité 17, 18 correspondante du tronçon de bande 16. Dans cette forme de réalisation, l’assemblage des deux extrémités 17, 18 pour fermer la courroie nécessitera l’introduction d’une seule tige de verrouillage 42 amovible dans les œillets ou passages transversaux en attente correspondants desdites pièces de jonction. With reference to the non-illustrated variant in which the joining device may comprise at least two connecting pieces, assembled together by a single removable locking rod, it is possible to dispose in each end zone of the impression, a side d a connecting piece so that it is directly overmolded with the corresponding end 17, 18 of the band section 16. In this embodiment, the assembly of the two ends 17, 18 to close the belt will require the introduction of a single locking rod 42 removable in the eyelets or corresponding transverse passages of said connecting pieces.
Dans la variante de réalisation représentée aux figures 11 à 15, et selon le type de maillons à griffe 51, 51’ que l’on souhaite utiliser, on peut disposer dans l’empreinte deux tiges de verrouillage 52 dans les deux zones d’extrémité destinées à former les extrémités 17, 18 du tronçon de bande 16, pour les noyer par surmoulage dans les deux extrémités 17, 18 du tronçon de bande 16. On peut également disposer dans l’empreinte une seule tige de verrouillage 52 dans une des deux zones d’extrémité destinée à former une des extrémités 17, 18 du tronçon de bande 16, et disposer dans la zone d’extrémité opposée, une tige de verrouillage 52 au travers de l’œillet fermé 53’ du maillon à griffe 51’, pour les surmouler dans l’extrémité 17, 18 correspondante du tronçon de bande 16. Dans cette forme de réalisation, le dispositif de jonction 50 ne comporte plus de tige de verrouillage 52 amovible, mais uniquement des maillons à griffe 51 amovibles ou des maillons à griffe 51’ articulés, permettant son démontage soit des deux côtés, soit du côté de l’extrémité 17, 18 restée libre. L’assemblage des deux extrémités 17, 18 pour fermer la courroie 100 sera ainsi plus rapide et plus facile puisqu’il sera obtenu par emboîtement d’une ou des deux griffes 55 des maillons 51, 5 sur une ou deux tiges de verrouillage 52 fixes. II ressort clairement de la description que l’invention permet d’atteindre les buts fixés, à savoir une nouvelle génération de courroie crantée à jonction mécanique, qui a l’avantage de présenter deux positions d’utilisation : une position ouverte facilitant grandement son montage et son démontage sur tout type de cadre ou de châssis, qu’il soit ouvert ou fermé, et une position fermée offrant les mêmes avantages et performances mécaniques que les courroies connues, notamment en termes de respect du pas P régulier entre les dents, de résistance à la traction sans allongement, de résistance à la fatigue. In the variant embodiment shown in FIGS. 11 to 15, and depending on the type of claw links 51, 51 'that it is desired to use, two locking rods 52 can be placed in the cavity in the two end zones. intended to form the ends 17, 18 of the strip section 16, to overmold them in the two ends 17, 18 of the strip section 16. It is also possible to have in the cavity a single locking rod 52 in one of the two end zones intended to form one of the ends 17, 18 of the band section 16, and have in the opposite end zone, a locking rod 52 through the closed eyelet 53 'of the claw link 51', to overmold them in the corresponding end 17, 18 of the band section 16. In this embodiment, the junction device 50 no longer comprises a removable locking rod 52, but only removable claw links 51 or links claw 51 'hinged, allowing disassembly or both sides, either the side of the end 17, 18 remaining free. Assembling the two ends 17, 18 to close the belt 100 thus will be faster and easier since it will be obtained by interlocking one or both claws 55 of the links 51, 5 on one or two fixed locking rods 52. It is clear from the description that the invention achieves the goals set, namely a new generation of toothed belt mechanical junction, which has the advantage of having two positions of use: an open position greatly facilitating its assembly and its disassembly on any type of frame or frame, whether open or closed, and a closed position offering the same advantages and mechanical performance as the known belts, especially in terms of respect for the regular pitch P between the teeth, tensile strength without elongation, resistance to fatigue.
Notamment et grâce à la suppression des soudures en référence à l’état de l’art décrit dans le publication EP 2 949 965 Bl, à l’augmentation du nombre de câbles de traction 23 et au meilleur respect du pas P, la courroie selon l’invention permet la transmission d’efforts élevés de l’ordre de 1500N en continu et 2000N en pic d’efforts dans le domaine du cycle, avec des courroie étroites typiquement de l’ordre l2mm, alors que comparativement la solution de l’état de l’art n’aurait permis d’atteindre qu’une valeur d’efforts de 900N. Encore une fois, ces valeurs sont données à titre d’exemple non limitatif pour démontrer les nouvelles performances de l’invention. Notably and thanks to the elimination of the welds with reference to the state of the art described in the publication EP 2 949 965 B1, to the increase in the number of traction cables 23 and the better respect of the pitch P, the belt according to the invention allows the transmission of high forces on the order of 1500N in continuous and 2000N in peak of efforts in the field of the cycle, with narrow belts typically of the order l2mm, whereas comparatively the solution of the state of the art would have achieved a value of effort of 900N. Again, these values are given by way of non-limiting example to demonstrate the new performance of the invention.
L’invention ouvre par conséquent de nouvelles possibilités d’applications. Une des applications concerne par exemple la maintenance de machines. La courroie 10, 100, 110, 120 selon l’invention peut facilement comporter un ou plusieurs tronçons de bande 16, assemblés les uns aux autres par un ou plusieurs dispositifs de jonction 40, 50, 60 à la manière d’une chaîne. Il est donc possible, à partir de différentes longueurs de tronçons de bande 16, de reconstituer plusieurs longueurs de courroie de transmission de puissance. Cette possibilité offre aux exploitants de machines d’avoir en stock différentes longueurs de tronçons de bande 16 et différents dispositifs de jonction 40, 50, 60 leur permettant de remplacer instantanément une courroie défectueuse afin de réduire au minimum le temps d’arrêt de la machine. La présente invention n'est bien entendu pas limitée aux exemples de réalisation décrits mais s'étend à toute modification et variante évidentes pour un homme du métier. Notamment, les différentes variantes de réalisation de courroie et de dispositifs de jonction peuvent être combinées. The invention therefore opens up new possibilities of applications. One of the applications concerns for example the maintenance of machines. The belt 10, 100, 110, 120 according to the invention can easily comprise one or more strip sections 16, assembled to one another by one or more junction devices 40, 50, 60 in the manner of a chain. It is therefore possible, from different lengths of strip sections 16, to reconstruct several lengths of power transmission belt. This possibility offers machine operators having in stock different lengths of tape sections 16 and different junction devices 40, 50, 60 enabling them to instantly replace a defective belt in order to minimize the downtime of the machine. The present invention is of course not limited to the embodiments described but extends to any modification and variation obvious to a person skilled in the art. In particular, the different embodiments of belt and junction devices can be combined.

Claims

Revendications claims
1. Courroie (10, 100, 110, 120) de transmission de puissance comportant sur au moins l’une de ses faces, des dents (14) séparées d’un pas (P) régulier pour former au moins une face crantée (12) agencée pour engrener des poulies dentées (1, 2) d’une transmission mécanique, ladite courroie (10, 100, 110, 120) comportant au moins un tronçon de bande (16) pourvu de ladite au moins une face crantée et d’une âme de traction (22) noyée dans son épaisseur pour obtenir une courroie (10, 100, 110, 120) renforcée, ledit tronçon de bande (16) étant délimité par deux extrémités (17, 18) chacune pourvue d’une dent (14), et d’au moins un orifice transversal (19) traversant et/ou d’au moins une tige de verrouillage (42, 52, 62) transversale, les extrémités (17, 18) dudit au moins un tronçon de bande (16) étant assemblées au moyen d’au moins un dispositif de jonction (40, 50, 60) coopérant avec au moins une tige de verrouillage (42, 52, 62) pour être au moins en partie démontable, ledit au moins un dispositif de jonction étant agencé pour former une courroie (10, 100, 110, 120) ayant deux états d’utilisation : un état ouvert dans lequel les extrémités (17, 18) dudit tronçon de bande (16) ne sont pas assemblées, et un état fermé dans lequel les extrémités (17, 18) dudit tronçon de bande (16) sont assemblées par ledit au moins un dispositif de jonction (40, 50, 60), et ladite âme de traction (22) comportant au moins un câble de traction (23) enroulé en spires ou en boucles longitudinales entre les deux extrémités (17, 18) dudit tronçon de bande (16) en entourant au moins partiellement ledit au moins un orifice transversal (19) ou ladite au moins une tige de verrouillage (42, 52) correspondante, caractérisée en ce que les brins (24) des spires ou des boucles longitudinales dudit au moins un câble de traction (23) formant ladite âme de traction (22) sont tous disposés côte à côte dans un même plan, sans se superposer, ce plan étant confondu avec un plan médian de la courroie (10, , 110, 120) correspondant à sa fibre neutre, en ce que l’axe dudit au moins un orifice transversal (19) ou de ladite au moins une tige de verrouillage (42, 52, 62) de chacune desdites extrémités (17, 18) est également positionné dans ledit plan médian de la courroie (10, 100, 110, 120) correspondant à sa fibre neutre, et en ce que ledit au moins un dispositif de jonction (40, 50, 60) est agencé pour écarter les dents (14) desdites extrémités (17, 18) dudit pas (P) régulier ou d’un multiple dudit pas (P) régulier. 1. Power transmission belt (10, 100, 110, 120) having on at least one of its faces, teeth (14) separated by a regular pitch (P) to form at least one notched face (12). ) arranged to mesh toothed pulleys (1, 2) of a mechanical transmission, said belt (10, 100, 110, 120) having at least one strip section (16) provided with said at least one notched face and a traction core (22) embedded in its thickness to obtain a reinforced belt (10, 100, 110, 120), said strip section (16) being delimited by two ends (17, 18) each provided with a tooth ( 14), and at least one transverse orifice (19) passing through and / or at least one transverse locking rod (42, 52, 62), the ends (17, 18) of said at least one strip section ( 16) being assembled by means of at least one connecting device (40, 50, 60) cooperating with at least one locking pin (42, 52, 62) to be at least partially disassembled able, said at least one connecting device being arranged to form a belt (10, 100, 110, 120) having two states of use: an open state in which the ends (17, 18) of said strip section (16) are not assembled, and a closed state in which the ends (17, 18) of said strip section (16) are joined by said at least one joining device (40, 50, 60), and said pulling core (22). ) comprising at least one traction cable (23) wound in turns or in longitudinal loops between the two ends (17, 18) of said strip section (16) at least partially surrounding said at least one transverse orifice (19) or said at least one corresponding locking rod (42, 52), characterized in that the strands (24) of the turns or longitudinal loops of said at least one pulling cable (23) forming said pulling core (22) are all arranged side by side side by side in the same plane, without overlapping, this plan t coincides with a median plane of the belt (10,, 110, 120) corresponding to its neutral fiber, in that the axis of said at least one transverse orifice (19) or of said at least one locking rod (42, 52, 62) of each of said ends (17, 18) is also positioned in said median plane of the belt (10, 100, 110, 120) corresponding to its neutral fiber, and in that said at least one junction device (40, 50, 60) is arranged to move the teeth (14) away from said ends (17, 18) of said regular pitch (P) or a multiple of said regular pitch (P).
2. Courroie selon la revendication 1, caractérisée en ce que ledit au moins un dispositif de jonction (40, 50, 60) comporte au moins un maillon de liaison (41, 51, 5G, 61) pourvu de deux œillets (43, 53, 53’) d’axes parallèles, distants dudit pas (P) régulier, et au moins une tige de verrouillage (42, 52, 62) amovible, et en ce que ledit au moins un tronçon de bande (16) comporte au moins un orifice transversal (19) dans au moins une desdites extrémités (17, 18) pour accueillir ladite au moins une tige de verrouillage (42, 52, 62) amovible. 2. Belt according to claim 1, characterized in that said at least one junction device (40, 50, 60) comprises at least one connecting link (41, 51, 5G, 61) provided with two eyelets (43, 53 , 53 ') of parallel axes, spaced apart from said regular pitch (P), and at least one detachable locking rod (42, 52, 62), and in that said at least one strip section (16) comprises at least a transverse orifice (19) in at least one of said ends (17, 18) for receiving said at least one detachable locking rod (42, 52, 62).
3. Courroie selon la revendication 2, caractérisée en ce qu’un des côtés dudit au moins un maillon de liaison (41, 51, 5G) est solidaire d’une des extrémités (17, 18) dudit tronçon de bande (16) par une tige de verrouillage (42, 52) fixe. 3. Belt according to claim 2, characterized in that one of the sides of said at least one connecting link (41, 51, 5G) is secured to one end (17, 18) of said strip section (16) by a locking rod (42, 52) fixed.
4. Courroie selon la revendication 2, caractérisée en ce que ledit au moins un dispositif de jonction (40, 50, 60) comporte deux tiges de verrouillage (42, 52, 62) amovibles, et en ce que ledit au moins un tronçon de bande (16) comporte un orifice transversal (19) dans chacune desdites extrémités (17, 18) pour accueillir lesdites tiges de verrouillage (42, 52, 62) amovibles. 4. Belt according to claim 2, characterized in that said at least one junction device (40, 50, 60) comprises two removable locking rods (42, 52, 62), and in that said at least one section of strip (16) has a transverse orifice (19) in each of said ends (17, 18) for accommodating said removable locking rods (42, 52, 62).
5. Courroie selon la revendication 4, caractérisée en ce que les deux tiges de verrouillage (62) amovibles sont solidaires d’un maillon de liaison (6G). 5. Belt according to claim 4, characterized in that the two removable locking rods (62) are integral with a connecting link (6G).
6. Courroie selon l’une quelconque des revendications 2 à 5, caractérisée en ce que ledit dispositif de jonction (40, 60) comporte deux maillons de liaison (41, 61, 6G) extérieurs, disposés de part et d’autre des flancs dudit tronçon de bande (16), et alignés entre eux transversalement. 6. Belt according to any one of claims 2 to 5, characterized in that said connecting device (40, 60) comprises two connecting links (41, 61, 6G) external, arranged on either side of the flanks said strip section (16), and aligned with each other transversely.
7. Courroie selon la revendication 6, caractérisée en ce que les flancs dudit tronçon de bande (16) comportent un dégagement (121) pour loger lesdits maillons de liaison (41, 61, 61’) extérieurs dans la largeur dudit tronçon. 7. Belt according to claim 6, characterized in that the flanks of said strip section (16) comprise a recess (121) for housing said connecting links (41, 61, 61 ') external in the width of said section.
8. Courroie selon l’une quelconque des revendications 2 à 7, caractérisée en ce que ledit dispositif de jonction (40, 50, 60) comporte au moins un maillon de liaison (41, 51, 5 , 61) intérieur, disposé dans la largeur dudit tronçon de bande (16), et en ce que ledit au moins un tronçon de bande (16) comporte dans lesdites extrémités (17, 18) au moins une encoche (21) pour recevoir ledit au moins un maillon de liaison (41, 51, 51’, 61) intérieur. 8. Belt according to any one of claims 2 to 7, characterized in that said connecting device (40, 50, 60) comprises at least one connecting link (41, 51, 5, 61) inside, arranged in the width of said band section (16), and in that said at least one band section (16) has in said ends (17, 18) at least one notch (21) for receiving said at least one connecting link (41). 51, 51 ', 61).
9. Courroie selon la revendication 8, caractérisée en ce que ledit dispositif de jonction (40, 50, 60) comporte un nombre N de maillons de liaison (41, 51, 5 , 61) intérieurs, et en ce que ledit au moins un tronçon de bande (16) comporte dans lesdites extrémités (17, 18) un nombre N d’encoches (21) pour recevoir lesdits maillons de liaison (41, 51, 51’, 61) intérieurs. 9. Belt according to claim 8, characterized in that said junction device (40, 50, 60) comprises a number N of internal connecting links (41, 51, 5, 61), and in that said at least one strip section (16) has in said ends (17, 18) a number N of notches (21) for receiving said connecting links (41, 51, 51 ', 61) interiors.
10. Courroie selon la revendication 1, caractérisée en ce que ledit au moins un dispositif de jonction comporte au moins deux pièces de jonction agencées pour être assemblées entre-elles par une seule tige de verrouillage amovible, et en ce qu’un côté desdites pièces de jonction est fixé dans chaque extrémité (17, 18) dudit tronçon de bande (16), ledit dispositif de jonction étant agencé pour écarter les dents (14) desdites extrémités (17, 18) d’un multiple dudit pas (P) régulier. 10. Belt according to claim 1, characterized in that said at least one junction device comprises at least two junction pieces arranged to be assembled together by a single removable locking rod, and in that one side of said parts. in each end (17, 18) of said strip section (16), said connecting device being arranged to move the teeth (14) of said ends (17, 18) by a multiple of said regular pitch (P). .
11. Courroie selon la revendication 1, caractérisée en ce que ledit au moins un dispositif de jonction (50) comporte au moins un maillon à griffe (51) ouvert et deux tiges de verrouillage (52) fixes, ledit au moins un maillon à griffe (51) étant pourvu de deux œillets (53) d’axes parallèles, distants dudit pas (P) régulier, chaque œillet (53) étant ouvert sur une fente (54) débouchante, et en ce que chaque tige de verrouillage (52) est solidaire d’une des extrémités (17, 18) dudit tronçon de bande (16). 11. Belt according to claim 1, characterized in that said at least one junction device (50) comprises at least one claw link (51) open and two locking rods (52) fixed, said at least one claw link (51) being provided with two eyelets (53) of parallel axes, spaced from said regular pitch (P), each eyelet (53) being open on a slot (54) opening, and in that each rod of locking (52) is secured to one end (17, 18) of said strip section (16).
12. Courroie selon la revendication 1, caractérisée en ce que ledit au moins un dispositif de jonction (50) comporte au moins un maillon à griffe (5 ) ouvert en partie et deux tiges de verrouillage (52) fixes, ledit au moins un maillon à griffe (5 ) étant pourvu de deux œillets (53, 53’) d’axes parallèles, distants dudit pas (P) régulier, dont un œillet (53’) est fermé et un œillet (53) est ouvert sur une fente (54) débouchante, et en ce qu’une des tiges de verrouillage (52) est solidaire d’une des extrémités (17, 18) dudit tronçon de bande (16) et traverse l’œillet (53’) fermé dudit au moins un maillon à griffe (5G), et l’autre tige de verrouillage (52) est solidaire de l’autre desdites extrémités (17, 18). 12. Belt according to claim 1, characterized in that said at least one junction device (50) comprises at least one claw link (5) partially open and two locking rods (52) fixed, said at least one link with claws (5) being provided with two eyelets (53, 53 ') of parallel axes, spaced from said regular pitch (P), one eyelet (53') of which is closed and one eyelet (53) is open on a slot ( 54) and that one of the locking rods (52) is integral with one end (17, 18) of said strip section (16) and passes through the closed eyelet (53 ') of said at least one claw link (5G), and the other locking rod (52) is integral with the other of said ends (17, 18).
13. Courroie selon l’une quelconque des revendications 11 et 12, caractérisée en ce que ledit au moins un tronçon de bande (16) comporte au moins une encoche (21) dans lesdites extrémités (17, 18) pour recevoir ledit au moins un maillon à griffe (51, 51’). 13. Belt according to any one of claims 11 and 12, characterized in that said at least one strip section (16) comprises at least one notch (21) in said ends (17, 18) for receiving said at least one claw link (51, 51 ').
14. Courroie selon l’une quelconque des revendications précédentes, caractérisée en ce qu’elle comporte plusieurs tronçons de bande (16) et plusieurs dispositifs de jonction (40, 50, 60) agencés pour assembler les extrémités (17, 18) correspondantes desdits tronçons de bande (16) adjacents. 14. Belt according to any one of the preceding claims, characterized in that it comprises a plurality of strip sections (16) and several junction devices (40, 50, 60) arranged to assemble the corresponding ends (17, 18) of said adjacent strip sections (16).
EP19708423.9A 2018-02-22 2019-02-22 Power transmission belt Withdrawn EP3755920A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1851503A FR3078128A1 (en) 2018-02-22 2018-02-22 POWER TRANSMISSION BELT AND METHOD FOR MANUFACTURING THE SAME
FR1855200A FR3078127B1 (en) 2018-02-22 2018-06-14 POWER TRANSMISSION BELT AND ITS MANUFACTURING PROCESS
PCT/EP2019/054470 WO2019162455A1 (en) 2018-02-22 2019-02-22 Power transmission belt

Publications (1)

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EP3755920A1 true EP3755920A1 (en) 2020-12-30

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EP19708423.9A Withdrawn EP3755920A1 (en) 2018-02-22 2019-02-22 Power transmission belt

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EP (1) EP3755920A1 (en)
FR (2) FR3078128A1 (en)
WO (1) WO2019162455A1 (en)

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Publication number Priority date Publication date Assignee Title
CN113272122A (en) * 2018-11-30 2021-08-17 格雷戈里.A.戈德西 Spiral band assembly, method of use and kit therefor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1195056A (en) * 1958-04-24 1959-11-13 Moulin De Saliens Junction device for transmission and conveyor belts
JPS5977146A (en) * 1982-10-21 1984-05-02 Mitsuboshi Belting Ltd Method for jointing cogged belt
ITBO20020062A1 (en) * 2002-02-05 2003-08-05 Attilio Rubino TOOTHED BELT JOINT FOR TRANSPORT AND TRANSFER OF PARTS
FR3021580B1 (en) 2014-05-30 2016-07-01 Tanals JUNCTION DEVICE FOR CLOSING A BAND OF LOOP MATERIAL AND BAND OF MATERIAL PROVIDED WITH SUCH A JUNCTION DEVICE
TWI593894B (en) * 2016-07-07 2017-08-01 Drive belt to improve the strength

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FR3078128A1 (en) 2019-08-23

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