Braking assembly, brake disc and wheel

A wheel comprising:

• a first side and a second side;
• and
• a braking assembly comprising:
• at least a first brake disc having a central axis (x1) and arranged to be coupled to a first side of the wheel;
• wherein said first brake disc comprises a wheel coupling face and defines at least one through-hole along an axis (x2) parallel to said central axis (x1) of the first brake disc;
• wherein said at least one through-hole defined by the first brake disk defines at least one inner portion concave toward said axis (x2) along which said through-hole is defined and having a decreasing diameter toward said wheel coupling face;
• at least one fastening means comprising a first convex portion, complementary to said concave inner portion defined by the through-hole of the first brake disc;
• wherein at least part of said first convex portion of the fastening means is arranged to abut against at least part of said concave inner portion defined by the through-hole of the first brake disc, when said first brake disc is coupled to said first side of the wheel.

A brake assembly for a railway wheel comprising:

• a first brake disc arranged to be coupled to a first side of the wheel and defining a first through-hole along an axis (x2) parallel to the central axis (x1) of the first brake disc and having a first inner portion concave towards said axis (x2) along which said through-hole of the first brake disc is defined;
• a second brake disc arranged to be coupled to a second side of the wheel and defining a second through-hole along an axis (x4) parallel to the central axis (x3) of the second brake disc and having a second inner portion concave towards said axis (x4) along which said through-hole of the second brake disc is defined;
• a bolt assembly having a first convex portion complementary to the first concave inner portion and disposed in such a way that at least part of said first convex portion abuts against at least part of the first concave inner portion when the first brake disc is coupled to the wheel;
• and
• a nut having a second convex portion complementary to the second concave inner portion and disposed in such a way that at least part of said second convex portion abuts against at least part of the second concave inner portion when the second brake disc is coupled to the wheel, wherein the nut is configured to engage a threaded end of the bolt assembly to affix the first and second brake discs to the wheel.