Device for a cable guide pulley

Abstract

The present invention relates to a device intended to form a liner of a cable guide pulley, the device having an outer face oriented radially outwards from the device, which face is provided with a groove of depth D and width W which is intended to be in contact with a cable of diameter DC, the groove creating a rim angle A, an outer profile of the groove comprising a gradual change in the radius of curvature.

Description

Description Title of the invention: DEVICE FOR A CABLE GUIDE PULLEY State of the art

[0001] The present invention relates to a device for a cable guide pulley. The invention relates, in particular, to a device for forming a lining of the cable guide pulley.

[0002] A device, a cable guide pulley, referred to in the present invention, the objects are usually described by a representation in a meridian plane, that is, a plane containing an axis of revolution (an axis of rotation) of the cable guide pulley. All these products (the device and the cable guide pulley) are objects having a geometry of revolution with respect to their axis of rotation.

[0003] Cable transport systems normally comprise a hauling cable routed along a given path; at least one transport unit movable along the path and connected to the hauling cable by a coupling device; a supporting structure located along the path for supporting and guiding the transport unit; and at least one cable guide pulley fitted to the supporting structure. Cable transport systems of the above type include both rail-mounted and suspended systems.

[0004] The cable guide pulley is provided with a device (lining), also called “cover” or “bandage”, intended to be in direct contact with the hauling cable. The device (lining) is mainly made up of one or more elastomeric compositions for better adhesion with the hauling cable and to absorb vibrations generated by the hauling cable and / or the supporting structure, transmitted through the hauling cable, while resisting mechanical aggression from the hauling cable, and a reinforcement section coated in the elastomeric composition for better clamping on a rigid member such as a wheel, a hub or a pulley on which the device (lining) is mounted, ensuring the load capacity of the device (lining).

[0005] The load capacity and endurance performance of the device (packing) result from the characteristics of the elastomer composition, the only material participating in the load-bearing action and deforming cyclically with each rotation. The increase in load capacity generates additional stress on the contact between the elastomer composition and the cable. A geometry of the groove of the device (packing) is a parameter influencing the wear (service life) of the elastomer composition and the level of stress experienced by the elastomer composition in shear and contact pressure.

[0006] In order to improve the service life and endurance performance of the device (packing), it is known that making the contact pressure level under the cable homogeneous to avoid the appearance of excessively stressed areas leading to greater fatigue is effective; the service life of the device (packing) is related to the early appearance of cracks in areas subjected to the highest pressures, while less loaded areas are able to last longer. Various solutions have been proposed to improve these functions.

[0007] Document DE3024177 describes a cable pulley having a groove consisting of a rounded bottom fitting the diameter of the cable and two straight sides, the coefficient of friction of the sides is lower than that of the bottom, the pulley may be constructed from sections, of which a section incorporating the rounded bottom is fixed between two outer members whose inner surfaces form the straight sides, the three sections may fit together, the middle section having a foot projecting outwards to fit into a recess in the base of each side section.

[0008] Document DE1575583 describes an exchangeable rope passage ring made of one or two different materials for rope pulleys cooperating with wire ropes, the wear material of said ring, in the region of the rope groove, is made of a material known per se, such as rubber or an elastic rope passage, the wear material is interrupted, in particular in the region of the rope groove, for better heat dissipation and to achieve a sufficiently firm fit.

[0009] Document DE102011055939 describes a pulley having a bearing surface for guiding a wire rope during its passage over the pulley and comprising a structured molding for enlarging a contact surface between the pulley and the wire rope, the molding being adapted to the shape of an outer surface of the wire rope, the molding having protrusions and / or recesses formed in a direction of rotation and / or in the direction of an axis of rotation of the pulley, the bearing surface being formed by an edge section, and the molding having structure sections whose length is proportional to the length of the wire rope.

[0010] However, with the solutions described in these documents, it is difficult to make the contact pressure level under the cable homogeneous, which leads to a degradation of the service life and endurance of the device (packing).

[0011] Therefore, there is a need for a device for forming the device (packing) of the cable guide pulley, which makes it possible to make the contact pressure level under the cable homogeneous, which results in an increase in the service life and endurance performance of the device (packing).

[0012] A “radial direction / orientation” is a direction / orientation perpendicular to the rotational axis of the cable guide pulley. This direction / orientation corresponds to the thickness orientation of the device (packing).

[0013] An “axial direction / orientation” is a direction / orientation parallel to the axis of rotation of the cable guide pulley. The direction / orientation parallel to the axis of rotation of the cable guide pulley ±10° is considered “substantially parallel” to the axial direction / orientation.

[0014] A “circumferential direction / orientation” is a direction / orientation that is tangent to any circle centered on the axis of rotation. This direction / orientation is perpendicular to both the axial direction / orientation and to the radial direction / orientation. The direction / orientation perpendicular to both the axial direction / orientation and the radial direction / orientation ±10° is considered “substantially parallel” to the circumferential direction / orientation.

[0015] The object of the invention is therefore to provide a device intended to form a device (lining) of a cable guide pulley, such a device (lining) being able to provide an improvement in the service life and endurance performance by an appropriate contour (external profile) of the groove.

[0016] The present invention relates to a device for forming a lining for a cable guide pulley, the device having an outer face oriented radially towards the outside of the device comprising: - a groove of a depth D which is a radial distance between a radially outermost point of the groove and a radially innermost point of the groove, of a width W which is an axial distance between two axial ends of the groove, and having an external profile, - the groove being intended to be in contact with a cable of DC diameter, - an inner face intended to be in contact with the cable guide pulley, - on a plane containing an axis of rotation of the cable guide pulley, the groove creating a rim angle A between a virtual line tangent to an outer profile of the groove at the radially outermost point of the groove and the axis of rotation of the cable guide pulley, - in a meridian plane of the cable guide pulley, the outer profile of the groove comprising a gradual evolution of the radius of curvature from the innermost point of the groove to the radially outermost point of the groove.

[0017] This arrangement provides improved service life and endurance performance through proper contour (outer profile) of the groove.

[0018] Since the outer profile of the throat includes a gradual evolution of the radius of curvature, such an outer profile would not induce transition effects at a junction between two arcs of different radii, in particular in terms of contact pressure and shear of the elastomer composition constituting the device (packing) due to the fact that the curvature changes abruptly at the connection points of the arcs of different radii, it is possible to make the contact pressure level more homogeneous under the cable, which gives an increase in the service life and endurance performance of the device (packing).

[0019] In another preferred embodiment, in a meridian plane of the cable guide pulley, the gradual evolution of the radius of curvature on the outer profile of the groove is a portion of a conic.

[0020] According to this arrangement, it is possible to design the outer profile of the groove to make the contact pressure level under the cable more homogeneous in an efficient manner.

[0021] In another preferred embodiment, in a meridian plane of the cable guide pulley, the gradual evolution of the radius of curvature on the outer profile of the groove is a portion of an ellipse, a semi-major axis of the ellipse being substantially parallel to the axial direction.

[0022] According to this arrangement, it is possible to increase the service life and endurance performance of the device (packing), since the outer profile of the groove would have a large radius in the central part of the groove, which makes the contact pressure level more homogeneous under the cable, and at the same time a small radius around the edge of the groove, ensuring better guidance of the cable without inducing a transition effect, which results in a reduction of the stresses on the elastomer composition constituting the device (packing).

[0023] In another preferred embodiment, an ellipticity of the ellipse (a length of a semi-minor axis divided by a length of the semi-major axis) is between 0.20 and 0.96.

[0024] If this ellipticity of the ellipse is greater than 0.96, there is a risk that the contact pressure in the central part of the groove will become too high due to an external groove profile that is too flat in the central part of the groove. If the ellipticity of the ellipse is less than 0.20, there is a risk that the contact pressure in the edge part of the groove, which is subject to the highest shear stresses and relative sliding between the cable and the elastomer composition constituting the device (packing), becomes too high due to too small an outer groove profile in the edge part of the groove. By specifying this ellipticity of the ellipse between 0.20 and 0.96, it is possible to make the contact pressure level more homogeneous under the cable, which gives an increase in the service life and endurance performance of the device (packing).

[0025] The ellipticity of the ellipse is preferably between 0.33 and 0.84, and ideally between 0.50 and 0.84.

[0026] In another preferred embodiment, the depth D of the groove is between 7% and 35% of the diameter DC of the cable to be guided.

[0027] If this groove depth D is less than 7% of the diameter DC of the cable to be guided, there is a risk of the cable coming loose from the groove due to the groove being too shallow. If this groove depth D is greater than 35% of the diameter DC of the cable to be guided, there is a risk that the contact pressure in the edge part of the groove will become too high due to too great a centering force generated by the groove. By specifying this groove depth D between 7% and 35% of the diameter DC of the cable to be guided, it is possible to make the contact pressure level more uniform under the cable, which gives an increase in the service life and endurance performance of the device (packing) and ensures correct guidance of the cable to be guided.

[0028] The depth D of the groove is preferably between 10% and 30% of the diameter DC of the cable to be guided, ideally between 12% and 25% of the diameter DC of the cable to be guided.

[0029] In another preferred embodiment, the edge angle A is between 12° and 80°.

[0030] If this edge angle A is less than 12°, there is a risk of the cable coming loose from the groove due to too low a centering force generated by the groove. If this edge angle A is greater than 80°, there is a risk that the contact pressure in the edge part of the groove will become too high due to too great a centering force generated by the groove. By specifying this edge angle A between 12° and 80°, it is possible to make the contact pressure level more uniform under the cable, which gives an increase in the service life and endurance performance of the device (packing) and ensures correct guidance of the cable to be guided.

[0031] The edge angle A is preferably between 20° and 45°, ideally between 30° and 40°.

[0032] In another preferred embodiment, the width W of the groove is between 105% and 180% of the diameter DC of the cable to be guided.

[0033] If this groove width W is less than 105% of the DC diameter of the cable to be guided, there is a risk of the cable coming loose from the groove due to the groove width being too small compared to the DC diameter of the cable to be guided. If this groove width W is greater than 180% of the DC diameter of the cable to be guided, there is a risk of vibration generation due to the groove width being too large compared to the DC diameter of the cable to be guided, which could also lead to possible cable coming loose. By specifying this groove width W between 105% and 180% of the DC diameter of the cable to be guided, it is possible to ensure correct guidance of the cable to be guided.

[0034] the width W of the groove is preferably between 120% and 160% of the diameter DC of the cable to be guided.

[0035] In another preferred embodiment, the device (packing) comprises at least one reinforcing section embedded in the volume.

[0036] According to this arrangement, it is possible to increase the service life of the device (lining) because the reinforcement section embedded in the volume gives a better clamping of the device (lining) on ​​a rigid member such as a wheel, a hub or a pulley on which the device (lining) is mounted, ensuring the load capacity of the device (lining).

[0037] According to the arrangements described above, it is possible to produce a device intended to form a device (lining) of a guide pulley of cable, said device (packing) being able to provide an improvement in service life and endurance performance by an appropriate contour (external profile) of the groove.

[0038] Other characteristics and advantages of the invention emerge from the description given below with reference to the attached drawings which illustrate, by way of non-limiting examples, the embodiment of the invention.

[0039] In these drawings:

[0040] Fig. 1 is a schematic sectional view of a device with a cable guide pulley according to one embodiment of the present invention;

[0041] Fig. 2 is an enlarged schematic view of a device with a cable to be guided according to the embodiment of the present invention;

[0042] A preferred embodiment of the present invention will be described below with reference to the drawings.

[0043] A device 1 according to an embodiment of the present invention will be described with reference to Figs. 1 and 2.

[0044] Fig. 1 is a schematic sectional view of a device with a cable guiding pulley according to an embodiment of the present invention. Fig. 2 is an enlarged schematic view of a device with a cable to be guided according to the embodiment of the present invention.

[0045] The cable guide pulley 99 having an axis of rotation XX', and comprising two axially spaced cheeks 97 defining an axial end of the cable guide pulley 99 and a hub 95 with which the cable guide pulley 99 is mounted so as to be able to rotate on a fixed spindle along the axis of rotation XX'. A horizontal center of the cable guide pulley 99 is denoted by YY'.

[0046] A device 1 is a device for forming a lining of the cable guide pulley 99 in a radially outer portion of the cable guide pulley 99 surrounded by two cheeks 97. The device 1 (lining) has an outer face 5 oriented radially towards the outside of the device 1 which is provided with a groove 4 of a depth D which is a radial distance between a radially outermost point of the groove 4 and a radially innermost point of the groove 4 and of a width W which is an axial distance between two axial ends of the groove 4 intended to be in contact with a cable 90 of diameter DC (shown in Fig. 2), and an inner face 6 intended to be in contact with the cable guide pulley 99.

[0047] As shown in Fig. 1, the device 1 (lining) comprises at least one reinforcing section 3 coated in a volume 2 of the device 1 (lining) in the radially innermost part of the device 1 (lining). The reinforcing section(s) 3 comprise a plurality of reinforcing belts 31 made up of substantially circumferentially oriented parallel reinforcing metal cords, cords or wires (not shown) coated with at least one elastomeric composition for the reinforcing section 3 serving to ensure sufficient tightening of the device 1 (lining) on ​​a rigid member, the cable guide pulley 99.

[0048] As shown in Fig. 1 and Fig. 2, on a plane containing an axis of rotation of the cable guide pulley 99, the groove 4 creates a flange angle A between a virtual line tangent to an outer profile 41 of the groove 4 at the radially outermost point of the groove 4 and the axis of rotation of the cable guide pulley 99, the outer profile 41 of the groove 4 includes a gradual evolution of the radius of curvature.

[0049] As shown in Fig. 2, the gradual evolution of the radius of curvature on the outer profile 41 of the groove 4 is a portion of a conic. The conic may be a quadratic curve such as an ellipse, a parabola or a hyperbola. In the present embodiment, the gradual evolution of the radius of curvature on the outer profile 41 of the groove 4 is a portion of an ellipse, and a semi-major axis SMJ of the ellipse is substantially parallel to the axial direction.

[0050] As shown in Fig. 2, an ellipticity of the ellipse, a length of a semi-minor axis SMA divided by a length of the semi-major axis SMJ, is between 0.20 and 0.96. In the present embodiment, the ellipticity of the ellipse is 0.54.

[0051] As shown in Fig. 2, the depth D of the groove 4 is between 7% and 35% of the diameter DC of the cable 90 to be guided, the edge angle A is between 12° and 80°, and the width W of the groove 4 is between 105% and 180% of the diameter DC of the cable 90 to be guided. In the present embodiment, the depth D of the groove 4 is 20% of the diameter DC of the cable 90 to be guided, the edge angle A is 40°, and the width W of the groove 4 is 130% of the diameter DC of the cable 90 to be guided.

[0052] Since the outer profile 41 of the groove 4 comprises a gradual evolution of the radius of curvature, such an outer profile 41 would not induce transition effects at a junction between two arcs of different radii, in particular in terms of contact pressure and shear of the elastomer composition constituting the device 1 (packing) due to the fact that the curvature changes abruptly at the connection points of the arcs of different radii, it is possible to make the level of contact pressure more homogeneous under the cable 90, which gives an increase in the service life and endurance performance of the device 1 (packing).

[0053] Since the gradual evolution of the radius of curvature on the outer profile 41 of the groove 4 is a portion of a cone, it is possible to design the outer profile 41 of the groove to make the level of contact pressure under the cable 90 more homogeneous in an efficient manner.

[0054] Since the gradual evolution of the radius of curvature on the outer profile 41 of the groove 4 is a portion of an ellipse and a semi-major axis of the ellipse is substantially parallel to the axial direction, it is possible to increase the service life and endurance performance of the device 1, because the outer profile 41 of the groove 4 would have a large radius in the central part of the groove 4, which makes the contact pressure level more homogeneous under the cable 90, and at the same time a small radius around the edge of the groove 4, ensuring better guidance of the cable 90 without inducing a transition effect, which results in a reduction of the stresses on the elastomer composition constituting the device 1 (packing).

[0055] Since the ellipticity of the ellipse (a length of a semi-minor axis divided by a length of the semi-major axis) is between 0.20 and 0.96, it is possible to make the contact pressure level under the cable 90, which gives an increase in the service life and endurance performance of device 1 (packing).

[0056] If this ellipticity of the ellipse is greater than 0.96, there is a risk that the contact pressure in the central part of the groove 4 becomes too high due to an external groove profile 41 that is too flat in the central part of the groove 4. If the ellipticity of the ellipse is less than 0.20, there is a risk that the contact pressure in the edge part of the groove 4, which is subject to the highest shear stresses and relative sliding between the cable 90 and the elastomer composition constituting the device 1 (packing), becomes too high due to an external groove profile 41 that is too small in the edge part of the groove 4.

[0057] The ellipticity of the ellipse is preferably between 0.33 and 0.84, and ideally between 0.50 and 0.84.

[0058] Since the depth D of the groove 4 is between 7% and 35% of the diameter DC of the cable 90 to be guided, it is possible to make the contact pressure level more homogeneous under the cable 90, which gives an increase in the service life and endurance performance of the device 1 (packing) and ensures correct guidance of the cable 90 to be guided.

[0059] If this depth D of the groove 4 is less than 7% of the diameter DC of the cable 90 to be guided, there is a risk of the cable coming loose from the groove 4 due to the groove 4 being too shallow. If this depth D of the groove 4 is greater than 35% of the diameter DC of the cable 90 to be guided, there is a risk that the contact pressure in the edge part of the groove 4 becomes too high due to too great a centering force generated by the groove 4.

[0060] The depth D of the groove 4 is preferably between 10% and 30% of the diameter DC of the cable 90 to be guided, ideally between 12% and 25% of the diameter DC of the cable 90 to be guided.

[0061] Since the edge angle A is between 12° and 80°, it is possible to make the contact pressure level more homogeneous under the cable 90, which gives an increase in service life and endurance performance of device 1 (packing) and ensures correct guidance of the cable 90 to be guided.

[0062] The edge angle A is preferably between 20° and 45°, ideally between 30° and 40°.

[0063] Since the width W of the groove 4 is between 105% and 180% of the diameter DC of the cable 90 to be guided, it is possible to ensure correct guidance of the cable 90 to be guided.

[0064] If this width W of the groove 4 is less than 105% of the diameter DC of the cable 90 to be guided, there is a risk of the cable coming loose from the groove 4 due to a groove width that is too small compared to the diameter DC of the cable 90 to be guided. If this width W of the groove 4 is greater than 180% of the diameter DC of the cable 90 to be guided, there is a risk of generating vibrations due to a groove width that is too large compared to the diameter DC of the cable 90 to be guided, which could also lead to a possible cable coming loose.

[0065] The width W of the groove 4 is preferably between 120% and 160% of the diameter DC of the cable 90 to be guided.

[0066] Since the device 1 (lining) has at least one reinforcement section 3 embedded in the volume 2, it is possible to increase the service life of the device 1 (lining) because the reinforcement section 3 embedded in the volume 2 gives a better clamping of the device 1 (lining) on ​​a rigid member such as a wheel, a hub or a pulley on which the device 1 (lining) is mounted, ensuring the load capacity of the device 1 (lining).

[0067] An example of the reinforcing belt 31 consists of cords, cords, cables, wires or metallic or textile sheets with straight or wavy strands, extending with or without an angle depending on the circumferential orientation.

[0068] An interface between volume 2 and reinforcement section 3 can have any shape, e.g., straight, wavy, zigzag, or conical.

[0069] The device 1 (trim) can be made so as to be placed partially radially outwards relative to the cheek 97. The device 1 (trim) can be made so as to have a shape such that at least one of its axial ends is chamfered.

[0070] The cable guide pulley 99 is preferably made of a material selected from steel or aluminum and / or magnesium alloys, composite materials based on carbon fiber, glass fiber, aramid fiber, plant fiber, said fibers being incorporated in a matrix based on thermosetting or thermoplastic compounds, or a complex composite comprising an elastomer and a complex based on resin and fibers selected from carbon fibers, glass fibers, aramid fibers, plant fibers or any combinations of these materials.

[0071] The matrix based on thermosetting compounds is selected from epoxy resins, vinyl ester, unsaturated polyesters, cyanate ester, bismaleimide, acrylic resins, phenolic resins, polyurethanes and their combinations.

[0072] The matrix based on thermoplastic compounds is selected from polypropylene (PP), polyethylene (PE), polyamides (PA), semi-aromatic polyamides, polyester (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polyethersulfone (PSU), polyetherimide (PEI), polyimide (PI), polyamideimide (PAI), polyphenylene sulfide (PPS), polyoxymethylene (POM), polyphenylene oxide (PPO).

[0073] The elastomer composition for volume 2 and / or section 3 reinforcement may consist of elastomers such as rubbers which may be crosslinked by chemical vulcanization reactions by sulfur bridges, by carbon-carbon bonds created by the action of peroxides or ionizing radiation, by other chains of atoms specific to the elastomer module, thermoplastic elastomers (TPE) in which the elastically deformable part forms a network between relatively non-deformable "hard" regions, the cohesion of which is the product of physical bonds (crystallites or amorphous regions above their glass transition temperature), non-thermoplastic elastomers and thermoset resins.

[0074] Volume 2 and / or reinforcement section 3 may consist of more than two different elastomeric compositions, superimposed, laminated or associated in any suitable manner. Volume 2 may be provided with any other reinforcement and / or reinforcing belt, single or multiple, known in the art.

[0075] A reinforcement section 3 shape may be any shape considered suitable, such as circular, elliptical, rectangular or polygonal.

[0076] A stiffness of the elastomer composition constituting volume 2 and / or section 3 of reinforcement can be evaluated by an elongation modulus MA10 according to ASTM D412 measured at an elongation of 10 percent (10%) and at a temperature of 23°C.

[0077] The elongation modulus MA10 of the elastomer composition constituting the reinforcement section 3 may be at least equal to 25%, preferably at least equal to 30% and ideally at least equal to 40% more than the elongation modulus MA10 of the elastomer composition constituting volume 2.

[0078] A preferred elongation modulus MA10 of the elastomer composition constituting volume 2 may be less than or equal to 8.0 MPa, preferably less than or equal to 7.0 MPa and ideally less than or equal to 6.0 MPa.

[0079] A preferred elongation modulus MA10 of the elastomer composition constituting the reinforcement section 3 may be greater than or equal to 10.0 MPa, preferably greater than or equal to 12.0 MPa and ideally greater than or equal to 14.0 MPa.

[0080] The invention is not limited to the examples described and shown and various modifications may be made without departing from its scope. List of reference signs 1 device 2 volume of the device 3 reinforcement section 31 reinforcement belt 4 throat 41 outer profile of the throat 5 exterior face 6 inner face 90 cable 95 hub 97 plays 99 cable guide pulley

Claims

Claims

1. Cable guide pulley comprising a device (1) intended to form a lining of a cable guide pulley (99), the device (1) having an outer face (5) oriented radially towards the outside of the device (1) comprising: - a groove (4) of a depth D which is a radial distance between a radially outermost point of the groove (4) and a radially innermost point of the groove (4), of a width W which is an axial distance between two axial ends of the groove (4), and having an external profile (41), - the groove (4) intended to be in contact with a cable (90) of diameter DC, - an inner face (6) intended to be in contact with the cable guide pulley (99), - on a plane containing an axis of rotation of the cable guide pulley (99), the groove (4) creating a rim angle A between a virtual line tangent to an outer profile (41) of the groove (4) at the radially outermost point of the groove (4) and the axis of rotation of the cable guide pulley (99), the device being characterized in that, in a meridian plane of the cable guide pulley (99), the outer profile (41) of the groove (4) comprises a gradual evolution of the radius of curvature from the innermost point of the groove (4) to the radially outermost point of the groove (4). And in that in a meridian plane of the cable guide pulley (99), the gradual evolution of the radius of curvature on the external profile (41) of the groove (4) is a portion of conic.

2. Pulley according to claim 1, wherein in a meridian plane of the cable guide pulley (99), the gradual evolution of the radius of curvature on the outer profile (41) of the groove (4) is a portion of an ellipse, and wherein a semi-major axis of the ellipse is substantially parallel to the axial direction.

3. A pulley according to claim 2, wherein an ellipticity of the ellipse (a length of a semi-minor axis divided by a length of the semi- major axis) is between 0.20 and 0.96, preferably between 0.33 and 0.84, and ideally between 0.50 and 0.

84.

4. Pulley according to any one of claims 1 to 3, wherein the depth D of the groove (4) is between 7% and 35% of the diameter DC of the cable (90) to be guided, preferably between 10% and 30% of the diameter DC of the cable (90) to be guided, and ideally between 12% and 25% of the diameter DC of the cable (90) to be guided.

5. A pulley according to any one of claims 1 to 4, wherein the flange angle A is between 12° and 80°, preferably between 20° and 45°, and ideally between 30° and 40°.

6. Pulley according to any one of claims 1 to 5, wherein the width W of the groove (4) is between 105% and 180% of the diameter DC of the cable (90) to be guided, preferably between 120% and 160% of the diameter DC of the cable (90) to be guided.

7. Pulley according to any one of claims 1 to 6, in which the device (1) comprises at least one reinforcement section (3) embedded in the volume (2).

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