Patent ID: 7703583

Claim:
A braking band of a disc for a disc brake of the ventilated type, the braking band extending between an inner diameter, close to an axis of rotation of the disc, and having an outer diameter between 280 and 400 mm away from the said axis of rotation of the disc; the braking band comprising two leaves defining an intermediate space and joined by connection means, said connection means being constructed in the form of posts; said posts being grouped in at least three concentric rows comprising: an outer row, close to the outer diameter of braking band, an inner row close to the axis of the disc, and at least one intermediate row between the inner row and the outer row; the posts in the inner row having a substantially rhomboidal cross-section in a plane parallel to the flow of air along the ventilation ducts with a longer diagonal directed in the radial direction; the posts of the intermediate row having a substantially rhomboidal cross-section in a plane parallel to the flow of air along the ventilation ducts, with the longer diagonal directed in the radial direction; wherein the outer diameter of the surface, and the thickness or dimension of the intermediate space between the two leaves measured in a direction parallel to the axis of the disc have a ratio between 15 and 32; the posts of the said outer row have a substantially triangular cross-section in a plane substantially parallel to the flow of air along the ventilation ducts with a base facing out from the disc and inner sides within the ventilation duct having a concave profile; said posts of the outer row comprising an arc of radius between 36 and 44 mm; and the braking band comprises 35-50 posts per row.