KIT FOR CONSTRUCTING AN AGRICULTURAL IMPLEMENT FROM A WHEEL BODY OR A TUBULAR BEAM

Description

[0001] The invention relates to a kit for forming an agricultural implement from a wheel body or a tubular support, the kit comprising a flexible tire having a hollow chamber and an internal wall which delimits this hollow chamber, the flexible tire further having a circular opening on the hollow chamber and a pair of beads which borders this circular opening and by means of which the flexible tire is mounted around the wheel body or the tubular support.

[0002] Agricultural tools are known in the form of a wheel, this wheel comprising a body of revolution and a flexible, hollow tire mounted on the periphery of the wheel body. A wheel forming a tool of this type is used in particular in certain field work machines. These machines are generally towed and of the mounted or semi-mounted type.

[0003] In agricultural machinery of this type, a soil working tool, such as a plowshare, disc, or tine, creates a furrow to receive seeds or grains. The furrow is then closed to allow the seeds or grains to germinate.

[0004] A tool wheel can be used in combination with a seed drill element to adjust the working depth. This is called a gauge wheel. A tool wheel can also be used to reconsolidate the soil after the element has passed over it, as is the case with so-called "press" wheels.

[0005] The wheel body is made quite rigid, which allows it to transmit the forces necessary for working the soil. The flexible bandage is made in such a way that its cover deforms during work, which promotes the detachment of the soil and prevents the bandage from clogging. Most often, the bandage is made of elastomer and is used uninflated, that is to say that the inside of its cover is in fluid communication with the outside of it.

[0006] Historically, there are at least two types of flexible tires for use in an agricultural wheel. According to the first type, the tire is made from a pneumatic tire, typically by retreading a motor vehicle tire. The flexible tire then has an envelope whose profile is open on the inner face of the tire. The tire is mounted on the wheel body by means of beads, each of which forms the end zone of a respective sidewall. The tire includes metal reinforcements, in the form of rods, in the beads because the pneumatic tire from which it is made requires reinforcements of this type for its pneumatic function. These rods stiffen the tire and contribute to its retention on the wheel body.

[0007] In EP 0 223 134 B2 and EP 0 245 648 B2, pneumatic truck tires are mounted on a tubular support to form a roller for agricultural use. These tires are held on the support by a pair of locking rings, which are mounted on the support, inside the opening and close to the tire beads, and a tensioning mechanism, which is actuated to move these rings apart from each other and tighten the tire beads against edges of the support.

[0008] Document EP0159274 A2 shows a kit comprising a flexible bandage having a hollow chamber and a tubular spacer disposed in said hollow chamber.

[0009] In use, agricultural tires made from pneumatic tires prove to be relatively non-deformable, mainly due to the rigidity of the pneumatic tires from which they are made.

[0010] According to a second type of bandage, the casing has a closed profile, one part of which, the sole, connects the sidewalls together opposite the tread. The bandage is mounted on the wheel body via this sole. It is then a bandage specifically designed and produced for agricultural use, which has the advantage of deforming more than bandages made from pneumatic tires. Such a bandage is made from a section of elastomer profile that is closed on itself into a sausage that is baked in a mold. An example of a bandage of this type is described in FR 3 004 384 A1.

[0011] For some time now, in particular at the initiative of the Applicant, another type of bandage has emerged, in which the envelope is formed directly by injecting elastomeric material into a mold.

[0012] Injection molding of tires is particularly advantageous in that it requires less manual intervention and is accompanied by less waste than manufacturing based on profile extrusion. Injection molding is also faster.

[0013] However, this injection molding process involves significantly modifying the profile of the casing compared to extruded bandages. It is indeed very difficult to produce casings with a closed profile and, more generally, special attention must be paid, when designing the bandage, to the internal face of the latter. Among other things, the bandage must be able to be easily removed from the mold core after curing.

[0014] In this context, the Applicant has designed a bandage for agricultural use, part of the blank corresponding to the sole of which is made of two separate portions, each attached to a respective sidewall. These portions can be separated from each other to facilitate the demolding of the blank. They join and assemble by shape cooperation to constitute the sole of the bandage. A portion which projects radially towards the inside of the bandage, in the manner of a bead, contributes to fixing this bandage to the wheel body. In particular, this bead can be wedged between two homologous flanges forming the wheel body.

[0015] In FR 3 028 136 A1, the Applicant went even further by proposing a treadless tire. The proposed tire comprises a generally annular casing with two parts forming sidewalls and a part forming a tread connecting the sidewalls together. The casing has an opening opposite the tread. The wheel body comprises a pair of flanges and a disc-shaped spacer, inserted between these flanges and fixed to them. The tire is mounted on the wheel body in such a way that the spacer is arranged across its opening, while the flanges are arranged in such a way as to block the sides of the casing against the spacer, at least in the vicinity of the opening. To achieve this, the ends of the sidewalls are shaped according to a beak profile and cooperate with complementary shaped edges of the flanges.

[0016] In the absence of a sole on the bandage, FR 3 028 136 proposes to modify the wheel body in some way compared to a conventional body in order to ensure that the bandage is held there.

[0017] This maintenance is particularly important because, when working, the tool is subjected to difficult conditions, linked for example to rapid advance of the machine or uneven or even rough terrain. In addition, because the tool may be required to work in a direction which may be at an angle to the direction of advance or take turns, forces are frequently exerted on the bandage which tend to cause it to come off the rim, i.e. to leave the seat of the wheel body.

[0018] This difficulty is overcome in agricultural tires made from pneumatic tires due to the integrated bead wires in the beads. However, injected tires are not required to be equipped with this type of bead wire in order to maintain the ability of these tires to easily deform and deform during work.

[0019] Similar considerations are found in the case of an agricultural tool in the form of a roller, comprising a tubular support and a plurality of flexible bandages mounted on this support, this plurality of bandages being interposed between two flanges which are each mounted at a respective end of the support.

[0020] The agricultural wheel of FR 3 028 136 is generally satisfactory. The Applicant sought to go even further and set itself the objective of providing an open-profile tire that can be easily mounted on a wheel body or a conventional tubular support, the rim edge or end flanges of which are devoid of beaks, and more generally of a portion projecting axially inwards from a radially more internal portion of this tire.

[0021] To this end, a kit is provided for forming an agricultural implement from a wheel body or a roller support, this kit comprising a flexible tire having a hollow chamber and an internal surface around this hollow chamber. The flexible tire further having a circular opening on the hollow chamber and a pair of beads bordering this circular opening and by means of which the flexible tire is mounted around the wheel body or the roller support. The kit further comprises an at least partially tubular spacer with two axially opposite end faces. At least on a portion corresponding to at least one of the beads, the internal surface extends in a generally frustoconical manner, flaring radially towards the outside of the flexible tire. At least one of the end faces of the spacer has at least one axially projecting surface.The spacer is shaped to fit across the opening of the flexible bandage so that the protruding surface is able to engage the inner surface in an area of ​​said portion corresponding to the heel.

[0022] The proposed kit makes it easy to make an agricultural wheel or roller from a conventional wheel body or roller support, at least in the agricultural sector. The spacer can be installed in the tire before mounting the assembly formed by the tire and this spacer on the wheel body or roller support.

[0023] The spacer alone ensures that the bandage is held on the wheel body, without the need for a tensioning mechanism or the like. The beads have a trapezoidal profile at least on their portion arranged inside the spacer which greatly contributes to locking the bandage on the wheel body or the roller support.

[0024] The engagement of the spacer with the inner surface of the bandage, at the level of the bead, allows not only to cancel an axial mounting clearance between the bandage and the rim, but also the radial mounting clearance, thanks to the truncated cone shape of this surface. This replaces the belts which are usually shaped in the sole of agricultural bandages.

[0025] An agricultural implement is also provided comprising a wheel body or roller support, a flexible tire having a hollow chamber and an inner surface around this hollow chamber. The flexible tire further has a circular opening on the hollow chamber and a pair of beads bordering this circular opening and by means of which the flexible tire is mounted around the wheel body or roller support. The implement further comprises an at least partially tubular spacer with two axially opposite end faces. At least over a portion corresponding to at least one of the beads, the inner surface extends in a generally frustoconical manner, flaring radially outwardly of the flexible tire. At least one of the end faces of the spacer has at least one axially projecting surface.The spacer is placed across the opening of the flexible bandage in such a way that the protruding surface engages the inner surface in an area of ​​said part corresponding to the heel.

[0026] Other characteristics and advantages of the invention will appear on reading the detailed description below, given in relation to the drawings, in which: there figure 1 represents a wheel according to the invention, seen from the front; the figure 2 represents the wheel of the figure 1 , sectional view along a line II-II; the figure 3 represents an exploded view of the wheel of the figure 1 ; there figure 4 represents a detail IV of the figure 2 ; there figure 5 represents a variant embodiment of the wheel of the figure 1 , in a view analogous to the figure 4 ; there figure 6 represents the wheel of the figure 5 , in a view analogous to the figure 2 ; there figure 7 represents an agricultural tool made from the wheel of figures 5 And 6 ; there figure 8 represents another variant of the wheel of the figure 1 , front view; the figure 9 represents the wheel of the figure 8 in isometric perspective; the figure 10 represents the wheel of the figure 8 in isometric perspective with a partially truncated bandage; figure 11 represents the wheel of the figure 8 , sectional view along a line XI-XI; the figure 12 represents a detail XII of the figure 11 ; there figure 13 represents a portion of a wheel bandage figures 8 à 12 , alone and seen in section along line XI-XI; figure 14 represents a portion of a wheel spacer figures 8 à 12 , alone and seen in section along line XI-XI; figure 15 represents a variant of the bandage of the figure 13 ; there figure 16 represents a portion of a wheel spacer figures 5 And 6, alone and in a view analogous to the figure 5 ; there figure 17 represents a variant of the spacer of the figure 14 ; there figure 18 represents a variant of the bandage of the figure 15 ; there figure 19 represents the spacer of the figure 14 front view; the figure 20 represents a variant of the spacer of the figure 19 there figure 21 represents a roller according to the invention, seen in longitudinal section; the figure 22 represents a detail XXII of the scroll of the figure 21 ; there figure 23 represents a variant of the roll of the figure 21 ; there figure 24 represents a detail XXIV of the scroll of the figure 23 ; there figure 25 represents a variant of the roll of the figure 23 ; there figure 26 represents a detail XXVI of the scroll of the figure 25 ; there figure 27 represents a variant embodiment of the wheel of the figure 1 , in a view analogous to the figure 2 ; there figure 28 is analogous to the figure 27 , for another wheel variant.

[0027] The drawings and the description below essentially contain elements of a certain nature. They may therefore not only serve to better understand the present invention, but also contribute to its definition, if necessary.

[0028] We refer to the figures 1 à 4 .

[0029] An agricultural tool, intended for working the fields, is shaped as a wheel 1. This wheel 1 comprises a body 3 having a general shape of revolution, around an axis which coincides with a central axis 4 of the wheel 1. The wheel 1 is equipped with a flexible bandage 5 mounted around the body 3. This bandage 5 has a shape of revolution of which a central axis coincides with the central axis 4 of the wheel 1 when the bandage 5 is mounted on the body 3.

[0030] Here we call "wheel body" the practically non-deformable, or rigid, part of the wheel 1, as opposed to its essentially deformable, or flexible, part, which constitutes the bandage 5.

[0031] The bandage 5 has a radially external peripheral face intended to come into contact with the ground and a radially internal peripheral face, opposite the external face, by means of which the bandage 5 comes to bear on a peripheral part of the body 3, or rim 7.

[0032] The peripheral portion of the body 3 intended in particular to support the tire 5 is called a "rim" ("rim" or "wheel rim" in English). The central portion of the body 3 by means of which the wheel is mounted, rotatably, on an axle is called a "hub" ("hub" or "wheel hub" in English). The remainder of the body 3, in particular the portion of this body 3 which connects the hub to the rim 7, can be called a "disc" ("wheel disc", "dish", or even "wheel dish" in English). The body 3 is thus essentially made up of the rim 7, a hub 9 and a disc 11.

[0033] Contrary to the usage that is sometimes made of it, the term "rim" does not here designate the entirety of the body 3.

[0034] The body 3 is of conventional design. This body 3 has a first lateral face, or inner face 13, and a second lateral face, axially opposite the first, or outer face 15. In the example illustrated here, where the wheel 1 is intended to be used, in combination with a seeding disc, as a gauge, the inner face 13 corresponds to the face of the wheel 1 directed towards this disc.

[0035] The rim 7 has a shape of revolution around the central axis of the body 3. The rim 7 comprises a wide middle portion 17, an axial section of which provides a pair of seating surfaces 18 for the tire 5. The rim 7 has a first rim, or inner rim 19, which borders the middle portion 17 on the side of the inner face 13 of the body 3, and a second rim, or outer rim 21, axially opposite the first and which borders the middle portion 17 on the side of the outer face 15 of the body 3. The middle portion 17 of the rim 7 is essentially cylindrical. The seats 18 are generally cylindrical and separated from each other axially by a part of the middle portion 17 forming a rim base 20. The inner rim 19 and the outer rim 21 project radially from the middle portion 17 of the rim 7. The base 20 of the rim 7 is radially set back from the seats 18.

[0036] The bandage 5 comprises a generally toric flexible envelope 23, the axis of which coincides with the central axis of the bandage 5. The envelope 23 partially delimits at least one generally hollow interior space, or chamber 25, open on the internal face of the bandage 5. The envelope 23 comprises a portion radially opposite the internal face of the bandage 5 shaped into a tread 27, by means of which the wheel 1 will be in contact with the ground. This strip 27 is part of the external face of the bandage 5.

[0037] The envelope 23 further comprises two portions axially opposite one another which form the sides of the bandage 5: an inner side 31 close to the inner face 13 of the body 3, to the left of the chamber 25 on the figure 2 , and an outer flank 33, close to the outer face 15, on the right. Each of the inner flank 31 and the outer flank 33 connects to a respective axial end of the band 27. When looking at the outer face of the bandage 5, this band 27 extends according to a generally curved profile, from the inner flank 31 to the outer flank 33, with a vertex 29. The distance from the vertex 29 to the central axis of the bandage 5 corresponds to half an outer diameter OD of this bandage 5. For example, the diameter OD is close to 403 millimeters. Here, the vertex 29 is approximately equidistant axially from the inner flank 31 and the outer flank 33.

[0038] The inner sidewall 31 and the outer sidewall 33 each extend generally radially, that is to say perpendicular to the central axis of the bandage 5. Opposite the strip 27, the inner sidewall 31 and the outer sidewall 33 each extend radially by a portion shaped like a bead, namely an inner bead 35 for the inner sidewall 31 and an outer bead 37 for the outer sidewall 33. The inner bead 35 and the outer bead 37 can be seen as radial ends of the inner sidewall 31 and the outer sidewall 33, respectively. These ends are refined relative to the rest of the inner 31 and outer 33 flanks. The inner bead 35 and the outer bead 37 each bear on a respective seat 18 of the rim 7 by means of a generally cylindrical radial end surface. The inner bead 35 and the outer bead 37 ensure contact between the bandage 5 and the rim 7 of the body 3.The bandage 5 is devoid of metal reinforcing elements, in particular rods, at least in the inner 35 and outer 37 beads.

[0039] The inner heel 35 and the outer heel 37 border an opening of the chamber 25 on the inner face of the bandage 5. The bandage 5 is therefore without a sheath, sometimes also called "semelle", that is to say a portion of the envelope 23 connecting the inner flank 31 to the outer flank 33 opposite the strip 27 and / or extending essentially axially from one end of these flanks remote from the strip 27 towards the inside of the bandage 5.

[0040] In the absence of a sole or the like, the envelope 23 has a largely open profile on the internal face of the bandage 5. This open profile greatly simplifies the manufacture of the bandage 5. The envelope 23 can be produced by molding, with injection molds of simple shape, unlike conventional bandages whose envelope has a closed profile, even partially. The manufacture of a closed envelope by injection is accompanied by difficulties related to demolding. Bandages whose envelope has a closed profile are generally manufactured by extruding a closed profile strip and joining a portion of this strip.

[0041] The bandage 5 is made of a flexible material, of the elastomer type, preferably of natural or synthetic rubber, possibly mixed with each other. This material preferably has a Shore hardness of between 45 and 75. The casing has a significant capacity to deform and return to its initial shape, due to the combination of a flexible material and the hollow chamber 25. The casing deforms in particular when the wheel 1 works, stressed by a reaction force from the ground. This force is exerted mainly radially towards the central axis of the wheel 1. This strongly distinguishes the bandage 5 from pneumatic bandages, in particular those used for the ground connection of motor vehicles.

[0042] The open profile of the casing 23 and the absence of rods facilitates the demolding of the bandage 5. This open profile facilitates the extraction of the part of the mold forming the core through the opening of the casing 23.

[0043] On its inner face, the bandage 5 has a first peripheral rim, or inner rim 39, which terminates the inner sidewall 31 and a second peripheral rim, or outer rim 41, which terminates the outer sidewall 33. The inner rim 39 and the outer rim 41 are each shaped in such a way that their shape corresponds respectively to that of the inner rim 19 and the outer rim 21 of the rim 7. The inner rim 19 and the outer rim 21 of the rim 7 thus offer additional seating surfaces to the bandage 5, which rests thereon by means of its inner rim 39 and outer rim 41.

[0044] In particular here, the inner rim 39 and the outer rim 41 of the tire 5 each comprise a respective edge surface 43, of revolution shape and centered on the axis of this tire 5, intended to rest on a homologous surface 45 of the inner rim 19 and of the outer rim 21 of the rim 7. The edge surfaces 43 and their homologous surfaces 45 are generally cylindrical. The edge surfaces 43 each radially terminate one of the inner flank 31 and of the outer flank 33. The homologous surface 45 of the outer rim 21 is located at a distance from the axis of the body 3 which corresponds to half the external seat diameter OSD. For example, the diameter OSD is close to 340 millimeters. The homologous surface 45 of the inner rim 19 is located at a distance from the axis of the body 3 which corresponds to half an internal seat diameter ISD. For example, the ISD diameter is close to 340 millimeters.

[0045] Here, the inner rim 39 and the outer rim 41 each further comprise a respective surface of the inner heel 35 and the outer heel 37 oriented opposite to the chamber 25, or outer surface 47. The outer surface 47 of the inner heel 35 and that of the outer heel 37 connect respectively to the edge surface 43 of the inner rim 39 of the bandage 5 and to that of the outer rim 41, here by a fillet.

[0046] The outer surface 47 of the inner bead 35 and that of the outer bead 37 are in shape correspondence with at least a part of the inner 19 and outer 21 edges of the rim 7. These parts form axial stops 48 against which the inner bead 35 and the outer bead 37 come to bear in a mainly axial direction.

[0047] In the embodiment shown here, the outer surface 47 of the inner bead 35 is generally frustoconical and flares in a direction radially towards the outside of the tire 5, in a manner corresponding to the axial abutment surface 48 of the inner edge 19 of the rim 7. The outer surface 47 of the outer bead 37 is generally crown-shaped, in a manner corresponding to the axial abutment surface 48 of the outer edge 21 of the rim 7.

[0048] The inner flank 31 and the outer flank 33 each have a surface directed opposite to the chamber 25, or outer surface 49. The outer surface 49 of the inner flank 31 and that of the outer flank 33 each connect to the edge surface 43 of the inner rim 39 and the outer rim 41 of the bandage 5, respectively.

[0049] The outer surface 47 of the inner heel 35 and that of the outer heel 37 connect to the end surface of the inner heel 35 and that of the outer heel 37, respectively, here by a rounding.

[0050] Preferably, the seating surfaces 18 and the radial end surfaces of the inner 35 and outer 37 beads are dimensioned in such a way that there is a slight clearance between these surfaces, in particular to allow the mounting of the bandage 5 on the rim 7 of the body 3. Such a clearance is for example less than 1 millimeter in diameter.

[0051] The bandage 5 has an inner surface which surrounds the chamber 25. This surface comprises two portions which form side walls 51 of the chamber 25 and a bottom wall 53 to which the side walls 51 are connected, here by means of rounded sections. The side walls 51 each comprise a first section 51A corresponding to one of the inner flank 31 and the outer flank 33 (to a surface of this flank oriented towards the chamber 25) and a second section 51B corresponding to one of the inner bead 35 and the outer bead 37 (to a surface of this bead oriented towards the chamber 25) and which extends the first section 51A towards the inside of the bandage 5.

[0052] The inner surface of the inner flank 31 and the inner heel 35, on the one hand, and the inner surface of the outer flank 33 and the outer heel 37, on the other hand, form the side walls 51 of the chamber 25. The bottom 53 of this chamber 25 is formed by a surface of the strip 27 directed towards the chamber 25.

[0053] The side walls 51 of the chamber 25 are generally frustoconical, centered on the axis of the bandage 5 and flare in the radially outward direction of the bandage 5, from the internal face of this bandage 5 to the bottom 53 of this chamber 25. Here, the side walls 51 of the chamber 25 are mutually symmetrical with respect to a plane normal to the axis of the bandage 5.

[0054] In a known manner, the bandage 5 has an annular lip 54 which projects from the casing 23 radially and axially towards the outside of this bandage 5. This lip 54 extends substantially along the circumference of the bandage 5. The distance from the end of the lip 54 to the central axis of the bandage 5 corresponds to half a diameter LD of the lip 54. For example, the diameter LD is close to 400 millimeters. The distance which separates this end from the outer surface 49 of the outer flank 33 in the axial direction of the bandage 5 corresponds to the width W2 of the lip 54. For example, the width W2 is close to 111 millimeters.

[0055] On the inner heel 35 and the outer heel 37, the bandage 5 here each time has a respective circular groove 55, centered on the axis of this bandage 5 and open onto its chamber 25. Each groove 55 is formed in one of the side walls 51 of the chamber 25, on the second section 51B thereof. In other words, on the frustoconical inner surface of the inner 35 and outer 37 heels.

[0056] Here, the grooves 55 are each located in a radial position which corresponds to the radially outer limit of the inner bead 35 or the outer bead 37. The portion of the bandage 5 which is located radially beyond a groove 55 corresponds to the inner flank 31 or the outer flank 33. Radially beyond each groove 55 is the first section 51A of a respective side wall 51 of the chamber 25. Radially below each groove 55 is the second section 51B of a respective side wall 51 of the chamber 25.

[0057] Each side wall 51 of the chamber 25 comprises a second section 51B which extends in a generally frustoconical manner, widening radially towards the outside of the bandage 5, over at least a portion of the inner bead 35 or the outer bead 37, and this portion runs from a circular groove 55 radially towards the inside of the flexible bandage 5.

[0058] Here, the second sections 51B of the side walls 51 of the chamber 5 extend in a generally frustoconical manner over the whole of their respective bead, from the groove 55 to the radial end of this bead which is in contact with the rim 7. The inner 35 and outer 37 beads each have a trapezoid-shaped profile, here rectangular as regards the outer bead 37. In addition, the first sections 51A of the side walls 51 of the chamber 5 also extend here in a generally frustoconical manner, from the groove 55 radially towards the outside of the bandage 5, in particular to the bottom 53 of the chamber 25. In other words, the side walls 51 of the chamber 25 have a pair of frustoconical portions which extend at least partly over the inner 35 and outer 37 beads, at least over a part of these which is located radially towards the inside of the bandage 5.

[0059] The wheel 1 comprises a part of revolution shaped as a spacer 56, which is mounted around the body 3, on the rim 7, across the opening on the chamber 25. The spacer 56 comprises a pair of axial end faces, arranged to come opposite the inner 35 and outer 37 beads when the spacer 56 is across the opening of the tire 5 on the chamber 25.

[0060] These axial end faces of the spacer 56 are arranged so as to engage, at least in part, in the side walls 51 of the chamber 25, each time at the level of a respective second section 51B. This engagement results from a penetration of at least a part of these axial end faces of the spacer 56 into the side walls 51. Each axial end face of the spacer 56 has a surface which projects axially from this face and by means of which the engagement takes place. Each projecting surface penetrates the side wall 51 of the chamber 25, on a part of the latter corresponding to the heels 35, 37.

[0061] This penetration may result from a local deformation (crushing) of the side walls 51, in the engagement zone, against the projecting surfaces of the spacer 56. Here, the axial ends of the spacer 56, which each carry a respective projecting surface, engage in each of the circular grooves 55 of the bandage 5. These axial end portions are shaped in a manner corresponding to the circular grooves 55, here in trapezoids.

[0062] It is important that the end portions of the spacer 56 each offer a respective projecting end surface, which allows the spacer 56 to engage the side walls 51, whether or not these are provided with a groove of the type of circular grooves 55. A projecting end surface projects from a flat end face perpendicular to the central axis of the spacer 56 corresponding to a tubular spacer profile.

[0063] Once mounted across the opening on the chamber 25, the spacer 56 defines a mutual spacing of the inner bead 35 and the outer bead 37 in the axial direction of the bandage 5. This spacing is greater than the mutual spacing of the inner 35 and outer 37 beads at rest. The spacer 56 maintains this spacing.

[0064] This spacing is such that before mounting the bandage 5 and the spacer 56 on the body 3, the distance which axially separates the outer surface 47 of the inner bead 35 from that of the outer bead 37 is greater than the distance which axially separates the axial stop surfaces 48 intended to receive them on the rim 7.

[0065] Once the spacer 56 and the bandage 5 are mounted on the body 3, the spacer 56 contributes to establishing and maintaining contact between the outer surface 47 of the inner 35 and outer 37 beads and a corresponding axial stop surface 48 of the inner 39 or outer 41 edges of the rim 7. The bandage 5 is thus mounted on the rim 7 with an axial stress exerted by the axial stop surfaces 48 on the inner 35 and outer 37 beads. This axial stress contributes to the engagement of the end portions of the spacer 56, and their projecting surfaces, in the side walls 51 of the chamber 25, in an area where this wall is frustoconical and flares radially towards the outside of the bandage 5.

[0066] This ensures that the bandage 5 is held around the body 3. This holding is similar to locking due to the engagement of the spacer 56 in the beads of the bandage 5 and the trapezoidal profile of these beads in their portion taken between the spacer 56 and the seats 18 of the rim 7. Most of the material of the inner 35 and outer 37 beads is located radially below the zone of engagement of the spacer 56 with the side walls 51.

[0067] The spacer 56 has a first axial end segment and a second axial end segment which are each shaped to correspond to a respective circular groove 55. The profile of the spacer 56 on its first axial end segment corresponds to the profile of one of the grooves 55 while the profile of the spacer on its second axial end segment corresponds to the profile of the other of the grooves 55. The same profile of spacer 56 can be used in the absence of a groove of the type of the circular grooves 55.

[0068] When the body comprises two flanges which are mounted on top of each other, the bandage 5 can be mounted on one of the flanges of the wheel body, for example the second flange 81, once the spacer 55 is housed in the opening of the bandage 5. In particular when the bandage 5 is provided with circular grooves of the type of circular grooves 55, the bandage 5 can be mounted on the flange once the spacer 56 is engaged in the side walls 51. One of the inner bead 35 and the outer bead 37 comes to bear on one of the seats 18, possibly with radial play linked to the mounting. The other flange of the wheel body, for example the first flange 79, is then attached to the first so that the other of the inner bead 35 and the outer bead 37 in turn come to bear against the other seat 18, possibly with mounting play.

[0069] Here, the spacer 56 has a generally tubular main portion 57, the central axis of which coincides with the axis 4 of the wheel 1 once the spacer 56 is mounted on the body 3. This tubular portion 57 carries the axial end portions of the spacer 56. The axial end portions of the spacer 56 correspond to axial end portions of its main portion 57.

[0070] The main portion 57 has a profile in the general shape of an isosceles trapezoid. A radially inner cylindrical surface 59 of the main portion 57 corresponds to the small base of this trapezoid, while a radially outer cylindrical surface 61 corresponds to the large base. The sides of the trapezoid are formed by two axial end surfaces 63 which form the projecting surfaces of the ends of the spacer 56. These axial end surfaces 63 are frustoconical, centered on the axis of the spacer 56 and flare radially towards the outside of the latter. The shape of these axial end surfaces 63 here corresponds to the shape of the bottom of the circular grooves 55. The same shape can be used without the circular grooves 55. The inclination of the end surfaces 63 of the spacer 56 relative to a radial direction is close to the inclination of the inner surfaces 51 of the internal flank 31 and of the external flank 33.Preferably, they have half-angles at the apex equal to plus or minus 5 degrees. Thanks to their projecting shape, these end surfaces 63 act like wedges and block the beads 35, 37 of the bandage 5 against the edges of the rim 7.

[0071] An axial stress resulting from axial compression of the bandage 5, at its heels 35, 37, of the order of 1 to 4 percent, or here for example approximately 1 to 3 millimeters, is targeted. To further increase the axial stress applied to the bandage 5, it is possible to envisage shaping the outer surface 47 of the outer heel 37 so that it extends in a frustoconical manner, flaring radially inwards, or according to a profile with a lobe projecting axially towards the outside of the bandage 5, while retaining the profile of the axial abutment surface 48 of the figure 4 .

[0072] The spacer 56 has a radially internal face by means of which the spacer 56 is mounted on the rim 7. This internal face has a plurality of ribs 65 which project radially towards the inside of the spacer 56, here of the internal surface 59 of the tubular portion 57.

[0073] Here, each rib 65 extends in an axial direction of the spacer 56. The latter rests via the ribs 65 on the rim 7, in particular here on the seats 18. The internal diameter of the ribs 65 corresponds to the internal diameter of the spacer 56 and to the internal diameter of the beads 35 and 37. The seats 18 of the rim 7 are occupied by the internal 35 and external 37 beads as well as by the ribs 65 of the spacer 56.

[0074] The longitudinal ends 66 of the ribs 65 are set back from the end faces of the spacer 56. The longitudinal ends 66 of the ribs 65 are shaped in a manner corresponding to the side walls 51 of the chamber 25 over a portion of these corresponding to the heels 35, 37, in particular radially below the circular grooves 55 or the engagement zone of the ends of the spacer 56. The end surfaces 66 of the ribs 65 are here frustoconical and flare radially outwards. The inclination of these longitudinal ends 66 relative to a radial direction is close to that of the side walls 51, here over a portion of these radially below the circular grooves 55. The ribs 65 are regularly distributed angularly over the circumference of the internal face of the spacer 56.These ribs 65 delimit between them free spaces inside which a part of the material of the inner 35 and outer 37 beads flows under the action of the spacer 56. This contributes to locking the bandage 5 on the rim 7 and to maintaining this locking, including in difficult working conditions. The longitudinal ends 66 of the ribs 65 come to bear against the beads 35, 37 in such a way that they participate in and / or increase the axial compression of the bandage 5 at the level of these beads 35, 37. These longitudinal ends 66 contribute to maintaining the bandage 5 on the rim 7.

[0075] A dimension along the axial direction of the inner surface 59 of the spacer 56 is greater than a minimum dimension along this direction of the opening on the chamber 25, to which is added, where appropriate, the depth of the circular grooves 55.

[0076] The spacer 56 here has an optional stop surface 67 for the strip 27 and intended to limit its displacement when the envelope 23 deforms. This stop surface 67 projects radially outwards from the rest of the spacer 56. This stop surface 67 is here carried by an annular secondary portion 69 around the main portion 57 and which connects to the outer surface 61 of the latter. The secondary portion 69 of the spacer 56 projects from the main portion 57 thereof, radially outwards. This secondary portion 69 connects to the outer surface 61 of the spacer 55 by a peripheral rib 70 which extends radially. This rib may be discontinuous around the periphery of the secondary portion 69. Here the abutment surface 67 is generally cylindrical and its axis coincides with the central axis of the spacer 55. Axially, this abutment surface is also located at the top 29 of the strip 27.

[0077] Other arrangements may be envisaged for the abutment surface 67, for example frustoconical or corrugated.

[0078] Here, this stop surface 67 supports a pressure sensor 71. The sensor 71 is capable of reacting to contact with a radially facing part of the strip 27 by measuring a force intensity resulting from the ground.

[0079] The spacing between the internal flank 31 and the external flank 33, i.e. the distance which separates their respective external surface in the axial direction, corresponds to a width W of the bandage 5.

[0080] When a force is exerted on the band 27 essentially directed radially towards the central axis of this bandage 5, the envelope tends to deform in such a way that the band 27 comes into contact with the stop surface 67. Such a force typically results from the reaction of the ground when the wheel 1 is working.

[0081] For example, a thickness of the inner flank 31 may be between 10 and 20 millimeters while the thickness of the outer flank 33 may be between 10 and 20 millimeters.

[0082] The outer flank 33 and the inner flank 31 have outer diameters close to each other.

[0083] The spacer 56 is rigid. It can be made of synthetic material, for example plastic material, such as polyethylene for example, or metal, such as steel or an aluminum alloy.

[0084] Here, the wheel body 3 is formed of a first flange 79 and a second flange 81, each in the general shape of a disc. The first flange 79 and the second flange 81 are mounted on each other to form the wheel body 3. The spacer 56 is not part of the body 3. This spacer is attached to the body 3 once installed inside the tire 5.

[0085] The first flange 79 and the second flange 81 each have a central axis, or axis of revolution. In the assembled state of the wheel body, these axes coincide with the axis 4 of the wheel 1.

[0086] The first flange 79 and the second flange 81 each have an internal face, not referenced, and an opposite external face. The external face of the first flange 79 and the external face of the second flange 81 correspond respectively to the internal face 13 and the external face 15 of the body 3. When assembling the first flange 79 and the second flange 81 on each other, their internal faces are pressed against each other.

[0087] The first flange 79 and the second flange 81 are fixed to each other, here reversibly, by means of a plurality of screw-nut pairs 83. These screw-nut pairs 83 are distributed over the surface of the wheel disc.

[0088] The first flange 79 comprises a central part 85, a peripheral part 87 and a web 89 connecting the central part 85 to the peripheral part 87. Here, the web 89 is solid. Alternatively, the web 89 may be perforated and / or comprise one or more arms connecting the central part 85 of the first flange 79 to the peripheral part 87 of the latter.

[0089] The central part 85 forms a part of the hub 9. This central part 85 is suitable for receiving an axle or a spindle intended to support the rotating wheel 1. The wheel 1 comprises a rotary bearing 91 housed in the central part 85, here in the form of a double-row ball bearing.

[0090] The peripheral portion 87 is generally annular in shape. The peripheral portion 87 carries the inner rim 19 of the rim 7, one, adjacent to the inner rim 19, of the seating surfaces 18 and a portion of the bottom 20 of the rim 7. On the side of the outer face, on the left on the figure 2 , the central part 85 is set back relative to the internal edge of the rim 7. This setback is typically around 40 millimeters.

[0091] The first flange 79 is formed as a single piece. The first flange 7 is here metallic, typically made of steel or aluminum alloy. The first flange 79 is for example obtained by stamping a sheet metal. In particular, the peripheral part 87 is obtained by folding the peripheral portion of the sheet metal on itself, which gives this peripheral part 87 a collar shape. The first flange 79 can also be obtained by molding or stamping.

[0092] The second flange 81 comprises a central part 93, a peripheral part 95 and a web 97 connecting the central part 93 to the peripheral part 95.

[0093] The peripheral portion 95 of the second flange 81 carries the outer edge 21 of the rim 7, the other seating surface 18 and the remaining portion of the bottom 20 of the rim 7. The second flange 81 is obtained, for example, by injection of plastic material. The second flange 81 then has low raw material and manufacturing costs. The second flange 81 can also be made of metal, like the first flange 79 or from a different material. The first metal flange 79 then has improved impact resistance, for example in the event of stones being thrown up when the machine is running.

[0094] The second flange 81 may take the form of an envelope consolidated by internal reinforcing walls, or ribs, between which multiple cavities are left empty. The ribs give the second flange 81 good mechanical strength, comparable to a solid metal or plastic part. They make it possible to ensure the necessary mechanical strength with little raw material. The volume occupied by the first flange 7 is largely hollow.

[0095] The central part 93 of the second flange 81 comprises a portion intended to house the remainder of the bearing 91.

[0096] Once the bandage 5 is threaded onto the rim 7, the first flange 79 and the second flange 81 support the bandage 5, here each approximately half. The radial force applied by the ground to the bandage 5 is distributed approximately equally over the flanges 79 and 81.

[0097] The bearing 91 is placed astride a two-part bore formed in the central parts of the first flange 79 and the second flange 81.

[0098] As the second flange is tightened onto the first, the axial stop surfaces 48 tend to move closer to each other. The engagement of the spacer 56 in the side walls 51 of the chamber 25 is continued and maintained, due to the fact that the spacing of the axial abutment surfaces 48 in the axial direction of the body 3 is less than the spacing in this direction of the outer surfaces 47 of the inner 35 and outer 37 beads. By tightening, the bandage 5 is compressed at its inner 35 and outer 37 beads, while engaging these beads with the spacer 56. As the axial mounting clearance decreases between the bandage 5 and the rim 7 and the axial compression of the bandage 5 increases on the beads 35, 37, by tightening the first flange 79 on the second 81, the radial mounting clearance between the rim 7 and the bandage 5 is also reduced, until it is zero, as a result of the engagement of the spacer 56 on a frustoconical portion of the beads 35, 37.In other words, the projecting surfaces of the ends of the spacer 56 cooperate with the truncated cone shape of the beads 35, 37 where the spacer 56 engages them, so as to ensure not only axial locking of the bandage 5 on the body 3, but also radial locking. This occurs without the axial abutment surfaces 48, or other surfaces of the rim 7, producing locking by cooperation of shape with the beads 35, 37.

[0099] The wheel 1 is intended to be mounted in an agricultural tool, in such a way that the inner face 13 of the body 3 is at least partly opposite a disc-shaped tool. The outer face 15 of the body 3 is then oriented opposite this disc.

[0100] The rim 7 is of the conventional type. This rim 7 has no surface which projects axially towards the inside of a radially more inward portion of the tire 5.

[0101] We refer to the figures 5 And 16 .

[0102] A variant 1 of the wheel described in connection with the figures 1 à 4 differs therefrom firstly in that the inner flank 31 is substantially thicker than the outer flank 33 while the homologous surface 45 of the inner edge 19 of the rim 7 is axially enlarged to correspond to the edge surface 43 of the inner edge 39 of the tire 5. This makes it possible to increase the resistance of the inner flank 31, in particular to wear, relative to the outer flank 33. During operation, the inner flank 31 is more exposed than the outer flank 33. Furthermore, this wheel 1 is intended to work with a cross angle relative to the direction of travel, an angle which exposes the inner flank 31. This excess thickness can reach 20 percent. This excess thickness of the inner flank 31 relative to the outer flank 33 also increases the contact pressure on the homologous surface 45 and improves the seal.

[0103] On its first portion 51A, the side wall 51 corresponding to the internal flank 31 extends according to a rounded profile, from the corresponding circular groove 55, which avoids constraints at the place of connection of the first portion 51A to the second portion 51B. This profile also increases the mass of material which is above the homologous surface 45 of the internal edge 19, thereby improving the seal between this surface 45 and the bearing surface 43. This first portion 51A connects to the bottom 53 with a wide fillet.

[0104] Unlike the abutment surface of the figures 2 And 4, the abutment surface 67 extends here in an inclined manner relative to the axial direction of the spacer 56. This makes it possible to compensate for an inclination of the wheel during work. This abutment surface 67 is carried by a generally frustoconical secondary portion 69. In addition, the abutment surface 67 has a slight curve, when this surface is viewed from the outside of the spacer 56. This curve ensures harmonious contact between the abutment surface 67 and the strip 27.

[0105] We refer to the figures 6 And 7 .

[0106] A seed drill assembly 100 comprises a pair of similar rotating tools 101, mounted symmetrically about a vertical plane on a support not shown. Each tool 101 comprises a respective seed disc 105, typically mounted freely rotatably on the frame of a machine or a tool pulled / pushed by such a machine, and a wheel 1 of the type of wheel described in connection with the figures 5 And 6 , mounted freely rotatable about an axis 109, for example on an arm (not shown) which connects the wheel 1 to the chassis in question. The disc 105 and the wheel 1 of a respective tool 101 are free to rotate relative to each other.

[0107] In each tool 101, the axis of rotation 109 of the wheel 1 is eccentric from the axis of rotation of the seeding disc 105. This eccentricity comprises a non-zero vertical component so that the axis of rotation of the disc 105 is lower than that of the wheel 1. The eccentricity in question further comprises a non-zero horizontal component so that the axis of rotation of the disc 105 is in front of that of the wheel 1.

[0108] The discs 105 of the assembly 100 are mounted in an inclined manner relative to a vertical plane, with a first angular pinch, and to the plane of symmetry, with a second angular pinch. These discs 105 approach each other in the direction of advance on the one hand and in a vertically downward direction on the other hand. The assembly 100 has a so-called "V" configuration relative to the vertical direction and the direction of advance. The first pinch angle and / or the second pinch angle are for example close to 5°. The first pinch angle may differ from the second.

[0109] The wheels 1 are oriented in a similar manner to the discs 105. The toe angles of the first and second wheels 1 may differ from those of the discs 105. The inclination of the stop surface 67 relative to the main portion of the spacer 56 is such that it compensates for the inclination of the wheels 1 relative to the vertical plane. The secondary portion of the spacer 56 thus provides a stop surface 67 which extends approximately horizontally when the wheel 1 is mounted on a tool of the tool type 101. This configuration is particularly advantageous when this stop surface 67 is intended to receive a pressure sensor. This sensor can measure a vertical force value, which facilitates the reading of the force relative to a biasing force.

[0110] When the assembly 100 is working, the discs 105 penetrate the soil 107 so as to create a furrow 110 therein, intended for example for burying seeds or grains, while the assembly 100 rests on the soil by means of the wheels 100, in particular the tread 27 of the tire 5. The working depth of the discs 105 is fixed by means of the wheels 1 and corresponds to the vertical offset of the axis of rotation 109 of the wheels 1 relative to that of the discs 105, that is to say to the vertical component of the eccentricity of these axes. The discs 105 can thus work the soil at a substantially constant depth, even when a field has unevenness.

[0111] The annular lip 54, which projects from the rest of the envelope radially and axially towards the outside of the bandage 5, rubs against the proximal face of a neighboring disc 105, scraping it. This scraping has the effect of cleaning the discs 105 of anything that might have adhered to them, such as mud or debris for example.

[0112] The domed shape of the abutment surface 67 of the spacer 56 ensures harmonious contact of this surface with the strip 27, which prevents damage to this strip.

[0113] The value measured by the sensor 71 makes it possible to characterize the penetration of the discs 105. In the case where the measured value is zero, or almost zero, the tire 5 does not deform, or only slightly, and the tread 27 does not touch the ground, at least not enough. This indicates insufficient penetration of the discs 105 and the risk that the seeds or grains are deposited directly on the ground, or at an insufficient depth. Knowing the force value applied to the tool as a whole, it is also possible to deduce from the force measured by the sensor 71 the resulting force on the discs 105.

[0114] In the case of a tamping wheel, where the bandage 5 is used to close furrows, a low measured force value indicates that the furrow is poorly closed and that the seed remains visible.

[0115] We refer to the figures 8 à 14 .

[0116] The wheel 1 represented there is distinguished from the wheel of figures 1 à 4 firstly because the body 3 is made up of a first flange 79 and a second flange 81 which are similar to each other.

[0117] As a result, the outer rim 21 of the rim 7 is shaped in a similar manner to the inner rim 19. The bandage 5 has a corresponding outer rim 41 shaped like its inner rim 39 and an outer bead 37 similar to the inner bead 35. In particular, the outer surface 47 of the outer bead 37 is frustoconical and flares radially outwards like the outer surface 47 of the inner bead 35. The inclination of the frustoconical portions of the side walls 51 of the bandage 5 is substantially greater than in the embodiment of the figures 1 à 4 , for example with a half angle at the apex close to 30 degrees. The inner bead 35 and the outer bead 37 thus occupy a larger part of the seating surfaces 18 of the rim 7, thus improving the hold of the bandage 5 on the body 3. A greater volume of material is also wedged between the spacer 56 and the seats 18, which further improves the locking of the bandage 5 on the body 3.

[0118] The abutment surface 67 has a slight curve here.

[0119] We refer to the figure 15 .

[0120] While retaining mutually analogous inner 35 and outer 37 heels, the bandage 5 may have truncated side walls 51 less inclined than those of the figure 13 in particular, here with a half angle at the summit close to 20 degrees.

[0121] We refer to the figures 17 et 18 .

[0122] The profile of each groove 55 corresponds to the profile of the axial end portions of the spacer 56. Here the profile of these grooves has the shape of a semicircle and not a semitrapezoid as on the figures 15 et 13 in particular. The shape of these axial end surfaces 63 corresponds to the shape of the bottom of the circular grooves 55, here semi-circular.

[0123] We refer to the figures 19 et 20 .

[0124] Without departing from the scope of the invention, the spacer 56 may have from 3 to a plurality of ribs. Preferably, these ribs are regularly distributed angularly, at 120 degrees from each other in the case of 3 ribs or 20 degrees in the case of 18 ribs.

[0125] We refer to the figures 21 et 22 .

[0126] The agricultural tool here takes the form of a roller 100 comprising a generally tubular support 102 on which is mounted a plurality of flexible bandages 5 of the type of flexible bandage described in relation to the figures 12 And 13 in particular, except that this bandage 5 is devoid of a lip of the type of lip 54 and that the outer surfaces 47 of the heels 35 are straight (extend in a plane perpendicular to the central axis of the bandage 5). The spacer 56 is analogous to the spacer described in relation to the figure 13 notably.

[0127] This spacer 56 engages, by its axial end portions, the side walls 51 of the chamber 25, at the level of the second sections 51B.

[0128] The roller 100 further comprises a plurality of additional spacers 104, each additional spacer 104 being interposed between two mutually adjacent flexible tires 5. Each additional spacer 104 has a generally tubular appearance, with a circular profile. A plurality of ribs 106 protrude radially inward from a radially inner face of the spacer 104. Each rib 106 extends generally in an axial direction of the spacer 104. Each additional spacer 104 is mounted on an outer surface of the support 102 by means of its ribs 106. By its axial ends, each additional spacer 104 bears against the heels 35 of two mutually adjacent tires 5, on the outer surface 47 thereof. The profile of the longitudinal ends of the additional spacers 104 corresponds to the profile of the outer surfaces 47 of the heels 35.

[0129] Here, this outer surface 47 is smooth, but could, as a variant, have a circular groove, with a profile corresponding to the axial end portions of the additional spacer, so as to achieve additional locking by shape cooperation. Here, the axial end portions of the additional spacers 104 are devoid of any projecting or recessed surface. These surfaces are flat and straight, i.e. they each extend in a plane perpendicular to the central axis of the additional spacer 104.

[0130] The bandages 5 are mounted on the support 102 once the spacers 56 are placed across the opening of the bandage 5, if necessary engaged in grooves of the type of circular grooves 55 described in relation to the preceding figures. The bandages 5 and the spacers 56 are held in mutual engagement by means of the additional spacers 104 and a pair of end plates 108 mounted on the support 102. The plates 108 have a rim 110 whose shape corresponds to the outer rim described in relation to the figure 4 notably.

[0131] The tightening of the flanges 110 on the support 102 ensures the axial compression of the bandages 5 at the level of their heels 35, compression necessary to maintain them axially and radially on the support 102, in a manner analogous to that described above in the case of an agricultural tool in the form of a wheel.

[0132] We refer to the figures 23 et 24 .

[0133] Roll 100 is distinguished from roll 1 figure 21 by the shape of the bandages 5.

[0134] Each side wall 51 of the chamber 25 has a first section 51A with a generally rounded, practically semi-circular profile and a second generally frustoconical section 51B widening radially towards the outside of the bandage 5. Each bandage 5 has on each of its second sections 51B a respective circular groove 55, here with a semi-circular profile. The groove 55 is optional.

[0135] The spacers 56 have a generally tubular main part 57, the axial end portions of which are each shaped in a manner corresponding to a respective circular groove 55. A portion of the end surfaces 63 of this main part 57 engages in the circular grooves 55, while the remainder of these surfaces 63 has a frustoconical profile, the shape of which corresponds to that of the second section 51B, at least in the vicinity of the location of engagement of the spacer 56 with the side walls 51 of the chamber 25.

[0136] The spacer 56 has a tubular central portion 112 by means of which the spacer 56 is mounted on the outer surface of the support 102. The central portion 112 is connected to the main portion 57 by means of an annular rib 114, which may be discontinuous. The ends of the central portion 112 are here shaped in a manner corresponding to the profile of the heels 35, i.e. each with a frustoconical end surface.

[0137] The spacer 56 has a secondary portion 69 which projects into the chamber 25, at the level of the first sections 51A of the side wall 51. This secondary portion 69 offers a stop surface 67 for the tread 27 of the bandage 5.

[0138] Unlike the flanges of the figure 21 , the flanges 108 here have a rim 110 which further comprises a truncated conical edge 115 which offers a seating surface to a radial section 49A of corresponding shape of the outer surface 49 of a flank 31.

[0139] For bandage 5, we prefer to use a fairly flexible material, of the order of 50 Shore A in order to make it very deformable and avoid fouling of the area between bandages 5.

[0140] We refer to the figures 25 et 26 .

[0141] Roll 100 is distinguished from roll 1 figure 22 in that the outer surface 47 of the heels 35, 37 is frustoconical and flares radially towards the inside of the bandage 5.

[0142] On these outer surfaces 47, a circular groove 116 is each provided, the profile of which corresponds to the profile of the axial end portions of the additional spacers 106. By these ends, the spacers 106 engage the heels 35 by cooperation in shape with the circular grooves 116.

[0143] Here, the axial end portions of the spacers 106 have an axially projecting end surface 118. These end surfaces 118 here have a semi-circular profile, but may, as a variant, be frustoconical, by analogy with the spacer of the figure 14 for example. The axial end portions of the spacers 106 cooperate with the outer surfaces 47 of the heels 35 in a manner analogous to that described for the spacers 56 arranged across the opening of the tires 5.

[0144] The edges 110 of the flanges 108 are shaped in a manner corresponding to the outer surface 47 of the heels 35, 37.

[0145] A kit has just been described for forming an agricultural tool from a wheel body or a tubular support, the kit comprising a flexible tire having a hollow chamber and an internal surface around this hollow chamber. The flexible tire further has a circular opening on the hollow chamber and a pair of beads which borders this circular opening and by means of which the flexible tire is mounted around the wheel body or the tubular support. The kit further comprises a spacer with at least one generally tubular part. At least one of the beads has a circular groove open on the hollow chamber while the internal surface extends in a generally frustoconical manner, widening radially towards the outside of the flexible tire, on at least a part of this bead which runs from the circular groove radially towards the inside of the flexible tire.The spacer is shaped to lie across the opening of the flexible tire so that an axial end portion of the generally tubular portion of the spacer engages in the circular groove.

[0146] At least one of the heels 35, 37 has a circular groove 55 open onto the hollow chamber 25 while the internal surface 51 extends in a generally frustoconical manner, widening radially towards the outside of the flexible bandage 5, over at least part of this heel 35, 37 which runs from the circular groove 55 radially towards the inside of the flexible bandage 5, while the axial end portion of this spacer 56 engages in the circular groove 55.

[0147] Each heel 35, 37 has a respective circular groove 55 open onto the hollow chamber 25, while the internal surface 51 extends in a generally frustoconical manner widening radially towards the outside of the flexible bandage 5 over at least a portion of each of these heels 35, 37 which runs from the circular groove (55) radially towards the inside of the flexible bandage 5, and the spacer 56 can be shaped so as to be placed across the opening of the flexible bandage 5 so that axial ends of this spacer 56 each engage in a respective circular groove 51.

[0148] The internal surface 51 may extend in a generally frustoconical manner, widening radially towards the outside of the flexible bandage 5 over a portion which runs from the circular groove 55 radially towards the outside of the flexible bandage 5.

[0149] At least one of the circular grooves may have a shape profile corresponding to a profile of at least one of the axial end portions of the spacer 56.

[0150] At least one of the circular grooves may have a generally truncated cone-shaped bottom which flares radially towards the outside of the flexible bandage 5.

[0151] A generally truncated inclination of the bottom relative to a radial direction may be close to an inclination of the internal surface relative to this radial direction, at least in the vicinity of the circular groove 55.

[0152] An inclination of at least one of the axial ends 63 of the spacer 56 may be close to the inclination of the internal surface 51 in the vicinity at least of the circular groove 55.

[0153] The circular grooves may appear optional. When the axial end portions of the tubular part of the spacer have at least one surface whose profile projects axially, the engagement of the spacer in the heels 35, 37 may result from a local deformation of the side wall 51 of the chamber, at the heels 35, 37 which causes a penetration of the ends of the spacer into these heels 35, 37.

[0154] In such a case, and in the case of the figure 4 for example, the same situation could be obtained for the spacer 56 and the bandage 5, without the latter being provided with the circular grooves 55.

[0155] The circular grooves 55 are of shallow depth, of the order of a few millimeters, for example one or two millimeters, and relatively narrow, so that these grooves can be seen as notches.

[0156] The invention is not limited to the examples of tools described above, only by way of example, but it encompasses all the variants that a person skilled in the art may envisage within the framework of the claims below.

[0157] The outer flank 33 and the inner flank 31 generally extend in the radial direction of the tire 9. As a variant, at least one of the outer flank 3 and the inner flank 31 generally extends in a direction slightly inclined relative to the radial direction, of the order of a few degrees and 15 degrees at most.

[0158] This inclination can be positive, when the sidewall deviates from the radial direction axially towards the outside of the bandage 5 as it moves away from the axis of the bandage 5, or negative, when this separation is in the direction axially towards the inside of the bandage 5.

[0159] The spacer 56 may have axial end portions of different shapes from one another.

[0160] One of the heels may be without a groove, the spacer engaging only the other heel.

[0161] The pressure sensor can be arranged on the internal surface of the strip 27, opposite the stop surface 67.

[0162] The internal surface 51 may extend, at least over the portion corresponding to the heel 35 or 37, with a half-angle at the apex of between approximately 15 degrees and 45 degrees, preferably between 15 and 35 degrees.

[0163] A rigid spacer carrying a pressure sensor at the right angle of the tread has also just been described. This arrangement of the sensor is not limited to the embodiments of the spacer described above. It applies to any agricultural tool of the type comprising a wheel body and a flexible tire mounted around the wheel body, the flexible tire comprising an opening on its inner face, and the tool further comprising a rigid spacer inserted in the opening and mounted on the rim, the spacer has a radially outer face facing the tread and the spacer has a radially outer surface forming a stop for the flexible tire, the tool further comprising a pressure sensor, the sensor being fixed on the stop surface facing the top of the tread or on the tread facing the stop surface.

[0164] This abutment surface may be inclined relative to the axial direction of the spacer. This abutment surface may be curved radially outwardly of the spacer. This surface may be generally frustoconical and flare radially in an axially outward direction.

[0165] An agricultural implement 1, 100 has also been described comprising a wheel body 3 or a roller support 102, a flexible bandage 5 having a hollow chamber 25 and an internal surface 51 around this hollow chamber 25, the flexible bandage 5 further having a circular opening on the hollow chamber 25 and a pair of beads 35, 37 bordering this circular opening and by means of which the flexible bandage 5 is mounted around the wheel body 3 or the roller support 102, the implement further comprising a spacer 56 at least partially tubular with two axially opposite end faces, characterized in that at least on a portion corresponding to at least one of the beads 35, 37, the internal surface 51 extends in a generally frustoconical manner, flaring radially towards the outside of the flexible bandage 5, and at least one of the end faces of the spacer has at least one projecting surface axially,the spacer 56 being placed across the opening of the flexible bandage 5 in such a way that the projecting surface 63 engages the internal surface 51 in an area of ​​said part corresponding to the heel 35, 37.,

[0166] The bandage 5 may be axially stressed at the level of the heels 35, 37. This axial stress may result, at least in part, from an axial deformation of the bandage 5, at the level of the heels 35, 37 of the order of 1 to 5 percent.

[0167] We refer to the figures 27 And 28 .

[0168] A variation of wheel 1 described in connection with the figures 1 à 4 is distinguished in particular in that the bandage 5 and the spacer 56 are mounted on a wheel body 3 comprising a single-piece main portion comprising the hub 9 and the web of which is made up of sticks 73 each connecting the hub 9 to the rim.

[0169] The body 3 of the wheel 1 comprises a circular flange 75 shaped into an outer rim similar to the second rim 21 of the previous figures. The flange 75 is mounted on the wheel body 3 so as to hold the tire 5 and the spacer 56 there. The wheel 1 also comprises an elastic closing ring 77, received in a groove (not referenced) of the wheel body 3. The ring 77 holds the flange 75 on the wheel body 3. The circular flange 75 is positioned against the outer bead 37 of the tire 5 and has an axially inner surface 76 in shape cooperation with the outer rim of this outer bead 37. The elastic ring 77 is positioned against the circular flange 75.

[0170] The axially inner surface 76 of the circular flange 75 may have a straight profile, as in the figure 27 , or a truncated cone profile centered on the axis of the hub 9 and flaring radially inwards as on the figure 28. In this case, the circular flange 75 acts like a wedge, which blocks the outer edge of the outer heel 37 radially outwards.

[0171] The bandage 5 has a circular groove on the inner surface of the outer bead 37. On its portion radially lower than the circular groove, the outer bead 37 has a truncated inner surface.

[0172] The spacer 56 has an axial end surface directed towards the inner heel 35 which is shaped into a peripheral rib 70. The peripheral rib 70 is of generally frustoconical profile, centered on the axis of the hub 9 and widening in a radial direction towards the inside. The rib 70 is in shape cooperation with the inner surface of the inner heel 35, at least on a portion of the latter in contact with the rib 70. The peripheral rib 70 supports a stop surface 67 of generally cylindrical profile, which projects radially into the chamber 25.

[0173] The spacer 56 further has a plurality of ribs 74. The ribs 74 are regularly distributed angularly around the circumference of the external face of the spacer 56. Each rib 74 has a surface 63 which projects from the axial end face of the spacer 56 directed towards the external heel 37 and engages the internal surface of the external heel 37, here in its circular groove.

[0174] The wheel body 3 can be made of spheroidal graphite cast iron or aluminum for example. The circular flange 75 can be made of plastic. The elastic ring 77 can be made of steel.

[0175] The assembly of the wheel 1 is done first by slight compression of the bandage 5, the spacer 56 and the circular flange 75 on the wheel body, then by positioning the elastic ring 77 against the circular flange 75.

[0176] This variant does not require screws for assembly. This simplifies and speeds up assembly. It also reduces the number of rough spots that could trap soil or plants when using wheel 1.

[0177] Optional features are listed below: The spacer comprises a generally tubular portion carrying the axial end faces and a stop surface for the tire, this stop surface projecting radially from said tubular portion, the kit further comprising a pressure sensor or the like, said sensor being attached to the stop surface. The tire is axially stressed at the beads. The spacer has a radially inner face, and the spacer comprises a plurality of axial ribs which project radially from the inner face of the spacer and by means of which the spacer is mounted around the wheel body or the roller support. Each axial rib has an axial end shaped in a manner corresponding to the inner surface over a portion thereof corresponding to a section of the bead which is located radially below said area.

Claims

1. A kit for forming an agricultural tool (1, 100) from a wheel body (3) or a roller support (102), the kit comprising a flexible track (5) having a hollow chamber (25) and an inner surface (51) around this hollow chamber (25), the flexible track (5) further having a circular opening on the hollow chamber (25) and a pair of beads (35, 37) bordering this circular opening and through which the flexible track (5) is mounted around the wheel body (3) or the roller support (102), the kit further comprising a spacer (56) at least partially tubular (57) with two axially opposite end faces, characterised in that at least on a part corresponding to at least one of the beads (35, 37), the inner surface (51) extends generally frusto-conically, flaring radially outwardly of the flexible track (5), and at least one of the end faces of the spacer has at least one axially protruding surface, the spacer (56) being shaped so as to be positioned through the opening of the flexible track (5) such that the protruding surface (63) is capable of engaging the inner surface (51) in a zone of said part corresponding to at least one of the beads (35, 37), while said bead (35, 37) has a circular groove (55) open onto the hollow chamber (25) and said zone comprises this circular groove (55), the circular groove (55) being shaped in a manner corresponding to the axially protruding surface (63) of the spacer (56).

2. The kit according to claim 1, wherein each end face of the spacer (56) having at least one axially protruding surface (63) further has an axially recessed surface (66), and this axially recessed surface (66) is shaped in a manner corresponding to the inner surface (51) over at least one part of the bead (35, 37) that is radially located below said zone.

3. The kit according to claim 2, wherein the axially recessed surface (66) of the spacer (56) is shaped in a manner corresponding to the inner surface (51) on a portion of the bead (35, 37) running, from said zone, radially inwardly of the flexible track (5), in particular to a radial end of the bead (35, 37).

4. The kit according to one of claims 2 to 3, wherein the axially recessed surface (66) is generally frusto-conical and flares radially outwardly of the spacer (56).

5. The kit according to one of the preceding claims, wherein the spacer (56) has a radially internal face (59), and the spacer (56) comprises a plurality of axial ribs (65) that radially projects from the internal face (59) of the spacer (56) and through which the spacer (56) is mounted around the wheel body (3) or the roller support (102), and wherein each axial rib (65) has an axial end (66) shaped in a manner corresponding to the inner surface (51) over a part thereof corresponding to a section of the bead (35, 37) which is located radially below said zone.

6. The kit according to one of the preceding claims, wherein the axially protruding surface (63) is generally frusto-conical or semi-circular in profile.

7. The kit according to one of the preceding claims, wherein the inner surface (51) extends, at least over the part corresponding to the bead (35, 37), with a half cone angle of between about 15 degrees and 45 degrees, preferably between 15 and 35 degrees.

8. The kit according to one of the preceding claims, wherein the spacer (56) has a radially internal surface (59) that is axially longer than an axial dimension of the opening of the track (5).

9. The kit according to one of the preceding claims, wherein the spacer (56) comprises a generally tubular portion (57) bearing the axial end faces and a stop surface (67) for the track (5), this stop surface (67) radially projecting from said tubular portion (57).

10. The kit according to claim 9, wherein this stop surface (67) extends generally frusto-conically by flaring along an axial direction.

11. The kit according to one of the preceding claims, wherein at least one of the beads (35, 37) has an external surface (47) with a profile that generally extends radially.

12. An agricultural tool (1, 100) comprising a wheel body (3) or a roller support (102), a flexible track (5) having a hollow chamber (25) and an inner surface (51) around this hollow chamber (25), the flexible track (5) further having a circular opening on the hollow chamber (25) and a pair of beads (35, 37) bordering this circular opening and through which the flexible track (5) is mounted around the wheel body (3) or the roller support (102), the tool further comprising an at least partially tubular spacer (56) with two axially opposite end faces, characterised in that at least on a part corresponding to at least one of the beads (35, 37), the inner surface (51) extends generally frusto-conically, by flaring radially outwardly of the flexible track (5), and at least one of the end faces of the spacer has at least one axially protruding surface, the spacer (56) being placed across the opening of the flexible track (5) such that the protruding surface (63) engages the inner surface (51) in a zone of said part corresponding to the bead (35, 37), while said bead (35, 37) has a circular groove (55) open onto the hollow chamber (25) and said zone comprises this circular groove (55), the circular groove (55) being shaped in a manner corresponding to the axially protruding surface (63) of the spacer (56).

13. The agricultural tool according to claim 12, wherein the track (5) is axially stressed at the beads (35, 37), and the axial stress at least partly results from an axial deformation of the track (5), at the beads (35, 37) in the order of 1 to 5 percent.

14. The tool according to one of claims 12 and 13, wherein the wheel body (3) comprises a one-piece main part, comprising a wheel hub and a wheel dish connecting the wheel hub to a wheel rim, and a circular flange (75) which is mounted to the main part, the flange being shaped as an external edge of the wheel body (3) in shape cooperation with an edge of the track (5).