Damper
In a damper for spin-drying washing machines, it is provided, with a view to amplitude-dependent damping behaviour being obtained accompanied with manufacture at a low cost, that a frictional damping unit, which is disposed inside a casing, comprises an at least sectionally bare and elastic frictional damping lining for producing a given frictional damping effect, and at least one stop element which is stationary in relation to the casing and turned towards the at least one frictional damping lining, with the at least one stop element being designed for direct cooperation with the at least one frictional damping lining.
1. A damper ( 12 ; 12 a ; 12 b ; 12 c ) for spin-drying washing machines comprising
a tubular casing ( 13 ) which has a central longitudinal axis ( 14 );
a tappet ( 15 ) which is guided for displacement in the casing ( 13 ) and projects from an end thereof;
fastening elements ( 16 , 19 ) which are mounted on a free end of the casing ( 13 ) and of the tappet ( 15 ), respectively; and
a frictional damping unit ( 32 ; 32 a ; 32 b ; 32 c ) which is disposed inside the casing ( 13 ), comprising
at least one annular elastic frictional damping lining ( 36 ) which is displaceable in relation to the casing ( 13 ) and the tappet ( 15 ) along the central longitudinal axis ( 14 );
at least one stop element ( 44 , 45 ; 44 a , 45 a ; 44 b , 45 b ; 44 c , 45 c ) which is stationary in relation to the casing ( 13 ) and faces toward the at least one frictional damping lining ( 36 );
wherein the at least one stop element ( 44 , 45 ; 44 a , 45 a ; 44 b , 45 b ; 44 c , 45 c ) comprises several stop pins ( 46 ; 46 a ; 46 b ; 46 c ) which extend along the central longitudinal axis ( 14 );
wherein the frictional damping unit ( 32 ; 32 a ; 32 b ; 32 c ) has a contact-pressure piston ( 33 ; 33 a ; 33 b ; 33 c ) which accommodates the at least one frictional damping lining ( 36 ) and has several grooves ( 39 ; 39 a ; 39 b ; 39 c ) which are parallel to the central longitudinal axis ( 14 );
wherein at least one end of the frictional damping lining which is partially uncovered within the contact-pressure piston faces open ends of the grooves; and
wherein during motion damping of the at least one frictional damping lining the grooves move over the stop pins to cooperate with the partially uncovered end of the at least one frictional damping lining.
2. A damper according to claim 1 , wherein the stop pins ( 46 ; 46 a ; 46 b ; 46 c ) are regularly spaced along a circle around the central longitudinal axis ( 14 ).
3. A damper according to claim 1 , wherein the stop pins ( 46 , 46 a ; 46 b ; 46 c ) at least partially have varying lengths.
4. A damper according to claim 1 , wherein two stop pins ( 46 ; 46 a ; 46 b ; 46 c ) at a time oppose one another diametrically.
5. A damper according to claim 1 , wherein the two opposite stop pins ( 46 ; 46 a ; 46 b ; 46 c ) have an identical length.
6. A damper according to claim 1 , wherein the stop pins ( 46 ; 46 a ; 46 b ; 46 c ) taper in a direction of the at least one frictional damping lining ( 36 ).
7. A damper according to claim 1 , wherein a first stop element ( 44 ; 44 a ; 44 b ; 44 c ), on the side of the casing ( 13 ; 13 a ; 13 b ; 13 c ), is provided for defining, on the side of the casing ( 13 ; 13 a ; 13 b ; 13 c ), the motion of the at least one frictional damping lining ( 36 ); and wherein a second stop element ( 45 ; 45 a ; 45 b ; 45 c ), on the side of the tappet ( 15 ), is provided for defining, on the side of the tappet ( 15 ), the motion of the at least one frictional damping lining ( 36 ).
8. A damper according to claim 1 , wherein the contact-pressure piston ( 33 ; 33 a ; 33 b ; 33 c ) comprises several grooves ( 39 ; 39 a ; 39 b ; 39 c ) which are parallel to the central longitudinal axis ( 14 ) and taper in the direction towards the frictional damping lining ( 36 ).