Pneumatically actuated adjusting device for acting on a spring device of a spring damper comprising a tubular body
A pneumatically operable adjusting device ( 1 ) is provided for acting on a spring device ( 5 ) of a spring damper device ( 3 ) having a tubular body ( 2 ), with a tubular piece-shaped housing ( 4 ) which is designed to surround the tubular body ( 2 ) and has a passage ( 6 ) passing through a peripheral wall of the housing ( 4 ), and the adjusting device ( 1 ) has an adjusting nut ( 9 ) with an internal thread ( 10 ) which is attached to an external thread ( 11 ) of a tubular body ( 2 ), 37 ) of the spring damper device ( 3 ) can be brought into screw engagement, the housing ( 4 ) being designed for releasable abutment against the adjusting nut ( 9 ) and having an inner recess ( 7 ) for forming a pressure chamber ( 8 ) which is in fluid connection with the passage ( 6 ) and the inner recess ( 7 ) forming a pressure wall ( 24 ), the fluid admission of which causes a force acting on the housing ( 4 ) in the axial longitudinal direction and the housing ( 4 ) has an abutment surface ( 54 ) designed for spring force admission by the spring device.
1. A pneumatically actuable adjusting device ( 1 ) for acting on a spring ( 5 ) of a spring damper device ( 3 ) having a tube body ( 2 ), the adjusting device comprising:
a housing ( 4 ), surrounding the tubular tube body ( 2 ), comprising:
a passage ( 6 ) passing through a peripheral wall of the housing ( 4 );
an abutment surface ( 54 ) for receiving a spring force from the spring;
a conical shoulder ( 12 ) contactable with the adjusting nut ( 9 ), and the shoulder ( 12 ) imparts a radially inwardly acting clamping force on the adjusting nut ( 9 ) to releasably secure the adjusting nut to the tube body ( 2 ); and
an adjusting nut ( 9 ) with an internal thread ( 10 ) which is screw engageable on an external thread ( 11 ) of a tubular body ( 2 , 37 ) of the spring damper device ( 3 );
wherein the housing ( 4 ) is releasably abuttable on the adjusting nut ( 9 ), and comprises an inner recess ( 7 ) defining a pressure chamber ( 8 ) in fluid communication with the passage ( 6 ), and wherein the inner recess ( 7 ) has a pressure wall ( 24 ), whereby pressurization of the pressure chamber ( 8 ) imparts a force upon the housing ( 4 ) in an axial longitudinal direction.
2. The pneumatically actuable adjusting device ( 1 ) according to claim 1 wherein the housing ( 4 ) is axially displaceable on the tube body ( 2 ) against the spring force of the spring ( 5 ).
3. The pneumatically actuable adjusting device ( 1 ) according to claim 2 , further comprising:
means ( 19 , 22 , 23 , 24 , 27 , 34 ) for at least partially forming the pressure chamber ( 8 ) having the pressure wall ( 24 ); and
an adapter sleeve ( 37 ) surrounding the tube body ( 2 ) between the tube body and the housing ( 4 ).
4. The pneumatically actuable adjusting device according to claim 3 wherein the housing ( 4 ) comprises:
a U-shaped groove, in a vicinity of the pressure wall ( 24 ), for receiving a sealing device ( 44 ) supported on a portion of the adapter sleeve ( 37 ) lacking an external thread; and
another sealing device ( 34 ), spaced-apart axially from the U-shaped groove, supported on an outer circumferential region of the adapter sleeve ( 37 ); and
wherein the pressure chamber ( 8 ) is formed between the housing ( 4 ), the sealing devices ( 34 , 44 ), and the adapter sleeve ( 37 ).
5. The pneumatically actuable adjusting device ( 1 ) according to claim 3 wherein the adapter sleeve ( 37 ) comprises an internal thread ( 39 ), along at least a portion of its longitudinal extent, releasably engageable with the external thread ( 11 ) of the tube body ( 2 ), and further comprising a clamping nut ( 51 ) releasably engageable with the adapter sleeve ( 37 ) for its releasable axial and rotationally fixed arrangement on the tube body ( 2 ) of the spring damper device ( 3 ).
6. The pneumatically actuable adjusting device according to claim 5 , further comprising:
a sealing device ( 40 ) between the adapter sleeve ( 37 ) and the tube body ( 2 ); and
a sealing device ( 56 ) between the clamping nut ( 51 ) and the housing ( 4 ).
7. A spring damper device ( 3 ) with a spring ( 5 ), a tube body ( 2 ), and a damping device ( 50 ) arranged inside the tube body ( 2 ) with means for influencing the flow of a damping fluid between two fluid chambers ( 48 , 49 ) formed in the tube body ( 2 ), and further comprising a pneumatically actuable adjusting device ( 1 ) according to claim 2 .
8. The pneumatically actuable adjusting device ( 1 ) according to claim 1 , further comprising a spring washer ( 14 ), in contact with the abutment surface ( 54 ), comprising a surface subjected to the spring force of the spring ( 5 ).
9. The pneumatically actuable adjusting device ( 1 ) according to claim 1 wherein the housing ( 4 ) comprises at least one expansion device ( 28 , 29 ) adapted to be brought into fluid communication with the pressure chamber ( 8 ) by a displacement of the housing ( 4 ) relative to the tube body ( 2 ).
10. The pneumatically actuable adjusting device ( 1 ) according to claim 1 , further comprising an annular body ( 18 , 19 ), surrounding the tube body ( 2 ), and comprising a substantially U-shaped groove ( 20 , 21 ) in its inner circumference or its outer circumference for receiving sealing devices ( 22 , 23 ); and
wherein the annular body ( 18 , 19 ), an inner circumferential wall of the housing ( 4 ), the pressure wall ( 24 ), and an outer circumferential wall of the tube body ( 2 ) at least partially define the pressure chamber ( 8 ).
11. The pneumatically actuable adjusting device ( 1 ) according to claim 1 , further comprising:
a sealing device ( 55 ) between the housing ( 4 ) and the adjusting nut ( 9 ); and
a sealing device ( 33 ) between the adjusting nut ( 9 ) and the tube body ( 2 ).