Abstract: A rotational element, to be braked, is provided on two opposite sides with braking discs. Each of the braking discs is constituted by an odd number of at least three segments. There are elements rigidly joining the segments together, elements rigidly fixing the segments to the rotational element and elements rigidly joining together the discs arranged on opposite sides of the rotational element. The rotational element includes a hub and a rim, joined by a web. In a preferred embodiment, the web includes a first radial region of greater rigidity located closer to the hub and a second radial region of lesser rigidity located closer to the rim. In these regions there are provided respective series of through apertures. The braking discs are secured to the rotational element in correspondence with the more rigid radial region. The rotational element can be provided as a central portion of a larger structure, or as an actual wheel, such as a railway wheel.

Abstract: A brake disc assembly comprising: a hub provided with a circumferential radial flange structure extending therefrom and having front and rear annular faces; at least two sector shaped lining parts which together form an annular assembly, each part being of monolithic construction and including confronting front and rear sector-shaped linings, all of the linings together forming front and rear annular linings the outer surfaces of which will be acted on by braking jaws during use of the assembly, each of the parts being removably fitted over the flange structure in concentric relationship with the hub so that the front and rear faces of the flange structure lie between the opposed surfaces of the confronting front and rear sector-shaped linings, the linings having radially extending inner ribs projecting therefrom so as to form cooling passages open at both their radial inner and outer ends, at least some of the ribs having edges which serve as guides for the lining parts during fitting of the latter over the