Braking band of a disc for disc brake of ventilated type

A braking band of a disc brake disc of ventilated type,

• said braking band extending between an inner diameter, near a rotation axis (X-X) of the braking band, and an outer diameter, far from said rotation axis (X-X), said rotation axis (X-X) defining an axial direction (X-X);
• said braking band defining a radial direction (R-R), orthogonal to said axial direction (X-X), and a circumferential direction (C-C), orthogonal to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T) orthogonal to said axial direction (X-X) and said radial direction (R-R);
• said braking band comprising two mutually facing plates;
• said two mutually facing plates comprising inner surfaces, either directly or indirectly facing and delimiting a gap;
• said two mutually facing plates each comprising a plate body having a predetermined extension in the axial direction (X-X) or a predetermined plate thickness;
• said two mutually facing plates being joined to each other by heat dissipating and connecting elements, hereinafter connecting elements;
• said connecting elements being shaped as columns, ribs or fins projecting from one plate of said two mutually facing plates towards an opposite plate of said two mutually facing plates, forming bridges which connect the of said two mutually facing plates to each other;
• wherein
• one plate of said two mutually facing plates comprises at least one ridge which projects from said plate into said gap without reaching the opposite plate of said two mutually facing plates, forming at least one localized narrowing of said gap and a thickening of the plate body, creating a localized increase of said predetermined plate thickness;
• wherein
• said at least one ridge remains separated from each connecting element, wherein a thickness of at least one plate of said two mutually facing plates about said at least one ridge is substantially equal to said predetermined plate thickness;
• wherein
• said at least one ridge extends forming at least two separate ridge branches;
• and wherein extensions of said at least two separate ridge branches are arranged straddling at least one connecting element.