Pneumatic shock absorber with rolling bellows

Claim 1

A pneumatic shock absorber, especially for road vehicles, which includes a rolling bellows made of rubber, or rubber-like elastomeric synthetic material, containing reinforcing elements; said rolling bellows having two oppositely disposed end portions which are respectively mounted by means of clamping rings on mounting regions of a first support element and a second support element respectively, with said second support element being in the form of a support piston; in the mounted state, said rolling bellows having a rolling fold associated with one of its end portions, said rolling fold being adapted to ride on a surface of said support piston; said mounting region of said support piston being in the form of a substantially cylindrical, reduced diameter portion of the latter, with a flange-like end abutment surface for the associated clamping ring being provided between said reduced diameter portion and said surface of said support piston on which said rolling fold rides, with said end abutment surface extending substantially at right angles to said reduced diameter portion of said support piston; circumferential ribs provided on said reduced diameter portion, and disposed in diametrical planes; said circumferential ribs having angularly symmetrical cross-sectional shapes; the improvement in combination therewith wherein: said circumferential ribs are provided in only one axial portion of said reduced diameter mounting region of said support piston; said circumferential ribs being provided in a central zone of said reduced diameter mounting region, with said central zone being bounded on both sides by respective smooth-cylindrical zones.