Spring device used in a pneumatic or hydraulic spring system of a motor vehicle comprises a dirt bellows arranged between an unrolling piston and an outer casing to act as an end stop

摘要

Spring device comprises two coaxially arranged spring elements (4a, 4b), each having a rolling bellows (6a, 6b) and an unrolling piston (8a, 8b). The two pistons are rigidly connected to each other and form a double-unrolling piston. The two spring elements have a common outer casing (10). The two rolling bellows, the double-unrolling piston and the outer casing surround a common pressurized chamber filled with a compressed gas or an incompressible hydraulic fluid. A dirt bellows (16) arranged between one unrolling piston and the outer casing is clamped at one end in the region of the unrolling piston and at the other end on the outer casing. The effective length of the dirt bellows is shorter than the effective length of the shorter of the two rolling bellows so that the dirt bellows acts as an end stop. Preferred Features: The two rolling bellows form a double-rolling bellows.