improved piston for air springs apply suspension of motor vehicles trailers, semi trailers

摘要

The present invention relates to a bottom coupling element for an air spring and a vehicle axle, commonly called piston, comprising an outer cylindric element coupled in a cup form to a lower bearing surface or bottom, reinforced by inner ribs for increasing its structural strength. A rigid disc to which a clamping screw is welded is co-molded in the bottom and is provided to be connected to the vehicle axle. The cylindric element of the piston is coupled to a flat portion in the form of a mantle, which is in turn coupled to a projecting portion thereby defining a ring arrangement on which can be tightly engaged an edge of an elastomeric membrane. The piston is made as a single-piece of practically constant thickness, from a plastics material and is so designed as to exploit the overall volume of the piston.