BigPatents India

The invention relates to a brake disk for a rail vehicle, comprising a hub body (16) and a brake ring (12) which are screwed together in such a way that thermal expansion from the brake ring (12) is possible in relation to the hub body (16) during braking actions. Screws (15) extend through openings aligned along the axis in a hub flange (14) which is arranged on the hub body (16) and in a brake ring flange (13) which is arranged on the brake ring (12). According to the invention, the screws are fixed in relation to the hub body (16) in the vicinity of the ends of the screws emerging from the brake ring flange (13) by means of a holding element, thereby ensuring that the screws (15) lie parallel to the axis and that the brake ring (12) is centralised even during thermal expansion. Said holding element can be, for example, a holding cam (17) which is integrally embodied in the hub body (16), or a holding elbow joint which is fixed onto the hub body. The screws (15) are positioned indirectly by means of a sleeve (20) which is movable along the axis or by means of a holding elbow joint which meshes with a groove on the hub. Furthermore, radial guides are provided for the brake ring (12) and can be carried out, for example, in a sliding block (18) by guiding the sleeve (20).