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EP-4735319-A1 - DEVICE FOR A CABLE GUIDE PULLEY

EP4735319A1EP 4735319 A1EP4735319 A1EP 4735319A1EP-4735319-A1

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.

Inventors

  • SOUYRI, PHILIPPE
  • DEAN, DAVID
  • HENNEBERT, GUILLAUME

Assignees

  • COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN

Dates

Publication Date
20260506
Application Date
20240625

Claims (7)

  1. [Claim 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 an edge 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 a conic.
  2. [Claim 2] A 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. [Claim 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. [Claim 4] Pulley according to any one of claims 1 to 3, in which 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. [Claim 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. [Claim 6] Pulley according to any one of claims 1 to 5, in which 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. [Claim 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).

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 relative to their axis of rotation. [0003] Cable transport systems typically 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 provided on the supporting structure. Cable transport systems of the above type include both rail-based and suspended systems. [0004] The cable guide pulley is provided with a device (lining), also called a “cover” or “bandage”, intended to be in direct contact with the towing cable. The device (lining) is mainly composed of one or more elastomeric compositions for better adhesion with the towing cable and for absorbing vibrations generated by means of the towing cable and/or the supporting structure, transmitted through the towing cable, while resisting mechanical aggression from the towing cable, and a reinforcement section coated in the elastomeric composition for better tightening 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 (lining) 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 the load capacity generates an additional stress on the contact between the elastomer composition and the cable. A geometry of the groove of the device (lining) is a parameter influencing the wear (the service life) of the elastomer composition and the level of stress undergone by the elastomer composition in shear and in 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 in order to avoid the appearance of excessively stressed areas leading to greater fatigue is effective; the service life of the device (packing) is linked 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 adapting to 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 can be constructed from sections, among which a section incorporating the rounded bottom is fixed between two outer members whose inner surfaces form the straight sides, the three sections can 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 molded part for enlarging a contact surface between the pulley and the wire rope, the molded part being adapted to the shape of an outer surface of the wire rope, the molded part comprising 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 molded part comprising 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 can make the contact pressure level under the cable homogeneous,