A brake disc includes an outer circumferential portion including a waveform portion having recessed portions and projecting portions repeatedly formed over an outer circumference, and for the outer circumferential portion to have substantially uniform heat capacity distribution in a circumferential direction and in a radial direction, the outer circumferential portion is formed such that a ratio of a difference in heat capacities among a plurality of circumferential sections in the outer circumferential portion, which are sectioned at an equal angle in the circumferential direction, relative to a heat capacity of each circumferential section is equal to or less than a first predetermined ratio. A ratio of a difference in heat capacities among radial sections in the outer circumferential portion, which are sectioned to have an equal length in the radial direction, relative to a heat capacity of each radial section is equal to or less than a second predetermined ratio.

A brake disc assembly includes a central drive hub and a wear disc, which includes first and second faces held together axially about the hub. Each face has a respective inner surface and is formed of at least two distinct segments. Each segment extends between two radial edges. The radial edges of the segments of one face do not extend opposite the radial edges of the segments of the other face. Each segment of the face is adapted to be secured to a segment of the other face via at least one fastening member adapted to hold said faces.

A brake disc assembly includes a central drive hub and a wear disc, which includes first and second faces held together axially about the hub. Each face has a respective inner surface and is formed of at least two distinct segments. Each segment extends between two radial edges. The radial edges of the segments of one face do not extend opposite the radial edges of the segments of the other face. Each segment of the face is adapted to be secured to a segment of the other face via at least one fastening member adapted to hold said faces.

A vehicle floating disc hub assembly includes a hub portion that includes a bearing housing provided on an inner circumferential surface such that a bearing coupled to an axle is mounted, a flange portion provided in one end in an axial direction, and a plurality of disc fastening grooves provided in the other end; and a disc portion mounted on the hub portion having a hub fastener to be fastened to the disc fastening groove through a fastening member corresponding to the disc fastening groove. The fastening member includes a spring gap mounted between the disc fastening groove and the hub fastener to form a contact force therewith, a spring plate formed to have an elastic force in the axial direction of the axle and placed in the spring gap, and a fastening bolt that couple to the hub fastener through the spring plate.

A disc brake rotor comprises a hub engagement member, an outer member, and a coupling arm. The hub engagement member is configured to engage with a hub assembly. The outer member is provided radially outwardly of the hub engagement member with respect to a rotational axis of the disc brake rotor. The coupling arm extends radially outwardly from the hub engagement member to the outer member. The coupling arm includes a first axial surface provided on a first axial side in an axial direction with respect to the rotational axis and a second axial surface provided on a second axial side reverse to the first axial side in the axial direction. At least one of the first axial surface and the second axial surface is non-parallel to a reference plane perpendicular to the rotational axis as viewed in a radial direction with respect to the rotational axis.

A disc has a braking band, a bell and elastic elements. The braking band has a plurality of radial teeth projecting from a radially internal edge portion, delimiting a plurality of band seats. Each radial tooth has a radially internal edge surface, a first and a second axial tooth side, and at least one circumferential side. A plurality of axial teeth project delimiting a plurality of bell seats. The plurality of radial teeth is housed in the plurality of bell seats. The internal bell surface is aligned with the radially internal edge surface of each radial tooth. Each elastic element is removably connected to the axial teeth and embraces a portion of first and second axial tooth sides and of circumferential side of the radial teeth of the braking band, elastically preloading the radial teeth with respect to the bell.

A splined portion (10) connected to one out of a brake disc and a hub to which the brake disc is to be connected. The splined portion comprises teeth (30) adapted to mesh with grooves in a second splined portion (20) connected to the other of said brake disc and hub, and extends annularly about an axially extending central axis. At least one, preferably a plurality, of the teeth (30) of the splined portion (10) is split into at least two tooth portions (31, 32) being resiliently movable towards and away from each other in a circumferential direction of the splined portion (10). The splined portion (10) further comprises a tensioning means (40) adapted to releasably adjust the circumferential distance between the two tooth portions (31, 32).

A splined portion (10) connected to one out of a brake disc and a hub to which the brake disc is to be connected. The splined portion comprises teeth (30) adapted to mesh with grooves in a second splined portion (20) connected to the other of said brake disc and hub, and extends annularly about an axially extending central axis. At least one, preferably a plurality, of the teeth (30) of the splined portion (10) is split into at least two tooth portions (31, 32) being resiliently movable towards and away from each other in a circumferential direction of the splined portion (10). The splined portion (10) further comprises a tensioning means (40) adapted to releasably adjust the circumferential distance between the two tooth portions (31, 32).

A brake assembly includes a wheel hub having a radially-outer diameter and a plurality of splines that are spaced apart around the radially-outer diameter. A brake disc is mounted on the wheel hub and has a radially-inner diameter and a plurality of pockets that are spaced apart around the radially-inner diameter. The pockets receive the splines such that the brake disc rotates with the wheel hub. Each pocket has opposing axially-extending side walls. Each side wall has an outwardly-chamfered outboard end and an inboard locking recess. A plurality of spacers are radially disposed between the splines and pockets. Each spacer has opposing arms connected together by a brace. Each arm has an outwardly-chamfered end and outwardly-projecting locking foot which together mate with the outwardly chamfered outboard end and inboard locking recess, respectively, so as to lock the spacer in the pocket.

In order to provide a brake disc unit the production and assembly of which is economically viable even with extreme mechanical and thermal load capacity, preferably without the application of intermediate elements, the disclosure proposes a brake disc unit with a friction ring and a friction ring carrier which are connected by a shaft-to-hub connection with an alignment gearing having a multitude of dogs, wherein the cross-section of the dogs provides a contour which, at least partly, runs along an extended trochoid.