Air spring device
Disclosed is an air spring device having a free-standing air spring bellows and an outer guide which is fastened to the air spring bellows by means of an inner clamping ring, wherein the outer diameter of the inner clamping ring is greater than the outer diameter of the air spring bellows in the unpressurized state, and the inner clamping ring generates a radially outwardly pointing encircling bulge in the unpressurized air spring bellows.
1. An air spring device ( 1 ) having an air spring bellows ( 4 ) made of elastomer material, an air spring cover ( 2 ) and an air spring piston ( 3 ), the air spring bellows ( 4 ) having an operating state in which it is substantially self-supporting and being attached in an airtight fashion by a first end to the air spring piston ( 3 ) so as to form a first rolling fold ( 13 ), and by a second end to the air spring cover ( 2 ) so as to form a second rolling fold ( 14 ), and together with the air spring cover ( 2 ) and the air spring piston ( 3 ) forming a hollow chamber ( 12 ) with an elastic volume, the air spring device ( 1 ) having a sleeve-shaped external guide ( 5 ) with an axial section of constant internal diameter, the external guide ( 5 ) tangentially surrounding the air spring bellows ( 4 ) between the first rolling fold ( 13 ) and the second rolling fold ( 14 ), and at least one internal clamping ring ( 16 ) which is arranged inside the air spring bellows ( 4 ), the external guide ( 5 ) being fastened to an external surface of the air spring bellows ( 4 ) within the axial section of constant internal diameter using the internal clamping ring ( 16 ), wherein the internal clamping ring ( 16 ) has an external diameter ( 17 ) and the air spring bellows has an external diameter, wherein the external diameter ( 17 ) of the internal clamping ring ( 16 ) is larger than the external diameter ( 18 ) of the air spring bellows ( 4 ) in a unassembled state, and the internal clamping ring ( 16 ) produces a circumferential, radially outward protrusion ( 19 ) when the air spring bellows is unpressurized, which protrusion has a diameter corresponding substantially to the internal diameter of the external guide ( 5 ), and wherein the internal clamping ring is secured relative to the air spring bellows by radial restoring forces of the air spring bellows.
2. The air spring device as claimed in claim 1 , wherein the second end attached to the air spring cover ( 2 ) and first end attached to the air spring piston ( 3 ) have diameters smaller than the external diameter ( 17 ) of the internal clamping ring ( 16 ).
3. The air spring device as claimed in claim 1 , wherein the second end attached to the air spring cover ( 2 ) and first end attached to the air spring piston ( 3 ) have a substantially identical diameter ( 11 ).
4. The air spring device as claimed in claim 1 , wherein internal clamping ring has an external diameter configured to be reduced and enlarged.
5. The air spring device as claimed in claim 1 , wherein the external diameter ( 17 ) of the internal clamping ring ( 16 ) is at least 15 mm larger than the outer diameter ( 18 ) of the air spring bellows ( 4 ) in the unassembled state.