Patent ID: 7059456

Claim:
An internally ventilated brake disk in the form of a circular ring disk with cooling channels in the interior of the disk which extend, respectively, from the inner circumference to the outer circumference of the circular ring disk, characterized in that the cooling channels are branched from the inside to the outside such that one channel opening on the inner circumference is connected with at least two channel openings on the outer circumference, and that one channel opening on the outer circumference is connected with at most one channel opening on the inner circumference, wherein the number of the branching points is 2 or greater than 2, and that the distances from the center of the disk to the branching points lie in two non-overlapping intervals ri+(ra−ri)*x, wherein x assumes a value of x 1 =0.1 to 0.5 for the first interval and x 2 =0.3 to 0.8 for the second interval, wherein the difference between x 2 and x 1 amounts to at least 0.05, and the ratio of the total surface Fa of the cross section, measured perpendicular to the center line of the channels, of the openings of channels lying on the outer circumference to the total surface Fi of the cross section, measured perpendicular to the center line of the channels, of the openings of the channels lying on the inner circumference amounts to Fa/Fi=0.1 to 1.07.