Bayerische Motoren Werke Aktiengesellschaft

Stefan Mandlmeier

Alexander Buck

Gero Pflanz

Hermann Sedlmaier

Klaas Batereau

Angela Helzel

Andreas Greitl

A brake disc is provided having ribs arranged between two friction rings, extending radially with side walls standing essentially perpendicular to the friction rings to bound air cooling ducts. At least one of the side walls of one, two, three, or five ribs is inclined with respect to the perpendicular ribs to avoid squealing noise. At least one of the ribs having at least one inclined side wall has a thickness measured in the direction perpendicular to the side wall which differs from the thickness of the perpendicular ribs. When two, three, or five ribs having inclined walls are present, the angles enclosed between these ribs preferably are not all the same. Any imbalance resulting from this non-uniform distribution of ribs having an inclined side wall is essentially eliminated by adding material on selected perpendicular ribs.

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Oberschleissheim, Germany

Stefan Mandlmeier