Rotor with alternate rib designs

摘要

The invention is directed to a brake rotor including a central hat section, a peripheral annular friction section having a pair of annular spaced apart friction plates, and plurality of posts extending between said friction plates. The posts include a plurality of first posts having an elongated cross sectional shape, and a plurality of second posts having a circular cross sectional shape. The posts are arranged in a plurality of circumferentially extending rows and radially extending columns to form vents for cooling the rotor.