Floating piston for single-tube shock absorber

A floating piston for a single-tube shock absorber, the shock absorber having a tubular sleeve, the floating piston being slidably arranged within the tubular sleeve so as to separate a sliding chamber from a blind chamber, the floating piston comprising:

• an annular support frame formed of a metallic material, having an L-shaped cross-section and provided with a central hole;
• a dynamic-lip seal disposed radially external to the frame and arranged in sliding contact with the sleeve of the shock absorber so as to define a radial seal external to the frame;
• and
• a central flexible membrane arranged so as to hermetically close the central hole of the support frame and capable of being deformed so as to anticipate movement of the floating piston;
• wherein the dynamic-lip seal and the flexible membrane are formed of two different elastomeric materials, the elastomeric material of the membrane being more flexible and elastic than the elastomeric material of the dynamic-lip seal.