Importance

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Abstract

The invention relates to a decoupling comprising two elements in rotation about a longitudinal axis, namely a rim and a hub, and also comprising a load support which ensures relative rotation between the rim and the hub, together with a torque transmission element positioned between the rim and hub, which comprises an elastic device deformable parallel to the longitudinal axis and comprising at least one elastic element, the pulley being characterized in that the torque transmission element comprises:—a first annular plate (1) connected in terms of rotation to one of the two elements, rim (4) or hub (3), and capable of moving axially with respect to thereto, having a first end face (11) in contact with a first end face (51) of the elastic device (5) and a second end face opposite to the first end face and comprising at least one first ramp path having at least one inclined zone (12, 14) forming a circular sector centred on the longitudinal axis and making a non-zero angle (α, α1, α2) with respect to a plane perpendicular to said longitudinal axis,—a second annular plate (2) connected in terms of rotation to the other of the two elements, hub (3) or rim (4), having an end face comprising at least a second ramp path having at least one inclined zone (22, 24) forming a circular sector centred on the longitudinal axis and making a non-zero angle (α, α1, α2) with respect to a plane perpendicular to said longitudinal axis,—a retaining cage (7) containing rolling elements (71) such as balls, positioned between the first (1) and the second (2) annular plate so that, depending on the relative rotational position of the rim (4) and of the hub, the deformable elastic device (5) is compressed axially by the combined action of at least one said rolling element (71) and of at least one said inclined zone (12, 14; 22, 24) of each of the first (1) and second (2) annular plates, the axial compression force thus generated being accompanied by a tangential force which is dependent on said angle and which transmits a torque between the first (1) and the second (2) annular plate and therefore between the rim (4) and the hub (3).

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First Claim