Improved shoe to machined cast anchor interface for duo-servo drum brake

摘要

A drum brake (10) includes a spider (12) having an anchor with as-cast recesses (62) and anchor (32) seats machined within the as-cast recesses (62). The as-cast recesses provide clearance for a shaft of a cutting tool during machining of the anchor seats (40). First (16) and second brake shoes (18) are pivotally supported by the anchor. Each brake shoe has a convex web portion positioned in communication with one of the anchor seats to transfer braking loads to the spider.