KALTVERFORMTER KOLBEN FUER HYDRAULISCH ARBEITENDE BREMSE

摘要

PCT No. PCT/EP90/01959 Sec. 371 Date Oct. 1, 1991 Sec. 102(e) Date Oct. 1, 1991 PCT Filed Nov. 16, 1990 PCT Pub. No. WO91/12445 PCT Pub. Date Aug. 22, 1991.For the elimination of distortion of a thin walled cold formed brake piston the piston (1) perimeter wall (5) is stiffened by one or more formed grooves (3) and one or more inwardly projecting ridges each formed by a corresponding groove. The shaping of the groove is carried out so that the wall thickness within the critical range (2) is at least equal to the wall thickness of the piston wall (4). The grooves may be used for securing a sealing cup, a rubber seal and/or a retaining spring for the brake pads.