Drum brake spider assembly with cantilever anchor pin

摘要

An improved spider assembly (46) for expanding shoe drum brakes (10) of the type utilizing cantilever mounted anchor pin members (18) is provided. The anchor pin includes a pivot surface portion (62) and a slightly enlarged headed portion (66) extending from the outboard side of the spider member (14). A specially configured washer (80) is slidably received upon the pivot surface portion of the anchor pin and is of a sufficient outer diameter (82) to axially retain the brake shoe webs (26) upon the anchor pin. The washer (80) is provided with a radially extending portion (94) and an axially extending portion (84) extending from the outer periphery of the radially extending portion at a diameter (86) greater than the outer diameter (88) of the anchor pin. The difference between the axial length (70) of the pivot surface portion and the axial width (72) of the brake shoe web is greater than the axial thickness (96) of the radially extending portion of the washer but less than the total axial length (98) of the axially extending portion (94) and the radially extending portion (84) of the washer thereby assuring that the brake shoe can not be assembled to the anchor pin unless the washer 80 is properly positioned thereon.