• The aluminum alloy piston serves as the connecting interface between the air spring and the vehicle chassis. Its design must balance load-bearing strength, lightweight performance, and precise sealing compatibility with the air bag.
• The protective housing is a metal sleeve positioned around the piston or at the end of the air bag. Its primary role is to protect the air bag from external impact and environmental damage while also providing stable guidance support for piston movement.

Together, the aluminum piston and protective housing function as the “structure and armor” of the air spring system. Through lightweight material selection, precision structural engineering, and coordinated functional design, they ensure elastic performance of the air spring while significantly enhancing overall reliability and service life.