Ventilated brake disc

A ventilated brake disc comprising:

• a first plate and a second plate each shaped as a circular ring and each having an inner surface and an outer surface, the inner surface of the first plate and the inner surface of the second plate facing each other, the first plate and the second plate collectively forming a central through hole and an outer periphery of the ventilated brake disc;
• a plurality of connecting ribs, each of the connecting ribs being integrally connected to the inner surface of the first plate and the inner surface of the second plate, each of the connecting ribs being elongated in shape and thereby defined with two ends opposite to each other, the two ends being oriented toward the central through hole and the outer periphery respectively;
• and
• a plurality of protruding ribs, each of the protruding ribs integrally protruding from the inner surface of one of the first plate and the second plate and being not connected to the other of the first plate and the second plate, each of the protruding ribs being located between two said connecting ribs,
• wherein each of the connecting ribs and the protruding ribs inclinedly extends from the outer periphery toward the central through hole, and
• wherein each of the connecting ribs and the protruding ribs has an inside surface inclinedly facing toward the central through hole, and an outside surface inclinedly facing toward the outer periphery;
• the inside surface of each of the connecting ribs has a plurality of indentations.