Patent ID: 9027718
Filing Date: 2015-05-12
Classification: F16D

Abstract:
1. A sound-damped brake rotor, for a vehicle braking system, that co-rotates with a vehicle wheel in close relationship to one or more brake pads that can be selectively applied against the brake rotor to slow the rotational speed of the wheel, the brake rotor comprising: a rotor hat made of steel that comprises an axially-protruding central hub along a longitudinal axis of the rotor hat and an integral flange that extends radially from and circumferentially around the central hub, the integral flange having a top annular surface and a bottom annular surface connected by an edge surface across a thickness of the integral flange, and at least one of the top annular surface or the bottom annular surface, or both, comprising a peripheral radial segment; and an annular rotor cheek made of cast iron that surrounds and is supported by the rotor hat, the rotor cheek comprising a top ledge that overlies the top annular surface of the integral flange and a bottom ledge that overlies the bottom annular surface of the integral flange, at least one of the top ledge or the bottom ledge providing an axially-oriented braking surface against which an associated brake pad can be selectively applied, the top ledge further having an underside that forms a top annular interfacial boundary with the top annular surface of the integral flange and the bottom ledge further having an underside that forms a bottom annular interfacial boundary with the bottom annular surface of the integral flange, and wherein at least one of the top annular interfacial boundary or the bottom annular interfacial boundary comprises (1) a non-wettable coating at the peripheral radial segment where relative frictional contacting movement occurs when vibrations are imparted to the rotor cheek, the non-wettable coating including a refractory component dispersed in a binder, and (2) a bonded interface radially inward of the non-wettable coating where a metallurgically fused interfacial joint is present.