Diaphragm arrangement for a spring brake actuator of a pneumatic braking system of a vehicle

A diaphragm arrangement (100) for a spring brake actuator (250) of a pneumatic braking system (210) of a vehicle (200a, 200b), comprising:

• an outer diaphragm member (110),
• an inner diaphragm member (120), and
• a piston plate (130),
• wherein the outer diaphragm member (110) is at least partially radially outwardly arranged relative to the inner diaphragm member (120) and the piston plate (130);
• wherein the piston plate (130) deflects together with a pushrod (260) for a spring brake actuator;
• wherein the outer diaphragm member (110) is configured for mounting to a housing (251) of the spring brake actuator;
• wherein the outer diaphragm member (110) includes a central opening (111);
• wherein the inner diaphragm member (120) and/or the piston plate (130) cover the central opening (111);
• wherein the outer diaphragm member (110), the inner diaphragm member (120) and the piston plate (130) are fixed to each other;
• wherein the diaphragm arrangement (100) is adapted to enable a mechanical interaction between a piston pipe (255) of the spring brake actuator and the push rod (260);
• wherein the inner diaphragm member (120) and the piston plate (130) are fixed to each other at circumferentially distributed connection sections (121).