Patent ID: 7389858

Claim:
A disc brake having a housing, a clamping device, a push rod, and a self-activating adjustment device, wherein the adjustment device includes a first subassembly and a second subassembly, characterized in that the adjustment device includes an assembling joint, which makes possible the transmission of a rotary motion from the first subassembly to the second subassembly, and which allows an axial relative motion between the first subassembly and the second subassembly of the adjustment device; wherein the first subassembly comprises a cylindrical element arranged between the housing and the push rod, the cylindrical element including a first end having a surface in contact with a surface of the housing and a second end having a surface in contact with a surface of the push rod; wherein at least one of the surface of the first end of the cylindrical element and the surface of the housing has a convex arching or spherical shape so as to allow a tipping motion of the cylindrical element with respect to the housing without jamming of the cylindrical element with respect to the housing during brake actuation; and wherein at least one of the surface of the second end of the cylindrical element and the surface of the push rod has a convex arching or spherical shape so as to allow a tipping motion of the cylindrical element with respect to the push rod without jamming of the cylindrical element with respect to the push rod during brake actuation.