Patent No. EP3009706 (titled "Air Spring Hybrid Piston Assembly") was filed by Continental Automotive Systems on Oct 1, 2015. The application was issued on Aug 10, 2022.
A two-part piston assembly for an air spring that enables large volume at low cost. The assembly comprises a lower piston section with a support ring and a damper snap ring, and an upper piston section that connects to the lower section via a seal. The upper section provides a larger volume for the air spring compared to conventional one-piece pistons, while maintaining a low-cost design.

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