Patent ID: 8123202

Claim:
A plunger piston ( 10 ) for a pneumatic spring, which acts between a resilient component ( 12 ) to be sprung and a second resilient component ( 14 ), wherein a plunger piston has a hollow body, a plunger piston end ( 16 ) is located at a bottom connected with the resilient component ( 14 ), and at a second plunger piston end ( 18 ) located at the top is connected with a pneumatic spring bellows ( 20 ) which can be charged with a compressed air, which is connected with the resilient component ( 12 ) and rolls off on an exterior of the plunger piston shell ( 22 ) during spring movements, the plunger piston comprising: the plunger piston end ( 16 ) located on a bottom which is open and has a reinforcement element ( 24 ) running around an edge area of the opening, the plunger piston ( 10 ) manufactured, at least in part, of a plastic material, and the reinforcement element ( 24 ) at least partially embedded in the plastic material by an injection molding process; a support bolt ( 26 ) arranged in an interior of the hollow plunger piston ( 10 ), the support bolt ( 26 ) extends from the second plunger piston bottom ( 18 ) at the top to the plunger piston end ( 16 ) located below, and a screw arrangement ( 30 ) for mounting the plunger piston ( 10 ) on the resilient component ( 14 ) is attached to the lower end ( 28 ) of the support bolt ( 26 ); and a tube-shaped plastic part ( 32 ) arranged around the support bolt ( 26 ) which is connected at an upper end ( 34 ) with the second plunger piston bottom ( 18 ), wherein the tube-shaped plastic part ( 32 ) tapers in a shape of a cone from the upper end ( 34 ) and forms a widen contact area ( 33 ) at a lower end for the second resilient component ( 14 ).