UNTERDRUCK-BREMSKRAFTVERSTAERKER FUER KRAFTFAHRZEUGE

摘要

To prevent a roll membrane which, together with a metallic membrane disk, forms the mobile wall of a vacuum brake booster from being forced out of a groove which receives the radialy inward region of the roll membrane, both the contour of a support surface (35) for the membrane disk (19) constructed on the housing (10) of the control valve and the contour of the radially inward region (sealing bead (42)) of the roll membrane (18) match the curved shape of the radially inward region (curvature (34)) of the membrane disk (19) and both the contour of the support surface (35) and that of the radially inward region (sealing bead (42)) of the roll membrane (18) match the curved shape of the radially inward region (curvature (34)) of the membrane disk (19) and the groove (27) extends axially into the contact region of the membrane disk (19) on the support surface (35).