Damper with flexible guiding damping unit
In a damper, in particular for spin-drying cylinder washing machines, it is provided, with a view to obtaining low-noise and low-wear guidance of a tappet in a casing, that the damper comprises a guiding damping unit which damps any deflections of the tappet in the radial direction and centers the tappet in the casing.
1. A damper comprising
a) a substantially tubular casing ( 8 ; 8 a ) which has a central longitudinal axis ( 9 ) and an end ( 24 ; 24 a ) on the side of a tappet ( 17 ; 17 a ) and a free end ( 10 ; 10 a );
b) the tappet ( 17 ; 17 a ) which is displaceably guided in the casing ( 8 ; 8 a ) and projects from the end ( 10 ; 10 a ) on the side of the tappet ( 17 ; 17 a ), having a central longitudinal axis ( 18 ) and an end ( 23 ; 23 a ) inside the casing ( 8 ; 8 a ) and a free end ( 19 ; 19 a );
c) fastening elements ( 12 , 20 ; 12 a , 20 a ) which are mounted on the free end ( 10 ; 10 a ) of the casing ( 8 ; 8 a ) and on the free end ( 19 ; 19 a ) of the tappet ( 17 ; 17 a );
d) a frictional damping unit ( 26 ; 26 a ) for producing a given frictional damping effect between the casing ( 8 ; 8 a ) and the tappet ( 17 ; 17 a ); and
e) a guiding damping unit ( 41 c ; 41 d ) for damping and centering any deflection of the tappet ( 17 ; 17 a ) crosswise of the central longitudinal axis ( 9 ) of the casing ( 8 ; 8 a ),
f) wherein the guiding damping unit ( 41 c ; 41 d ) is composed of several damping elements ( 50 c ; 50 d ) of annular arrangement, relative to the central longitudinal axis ( 18 ),
g) wherein each damping element ( 50 ; 50 d ) possesses at least one curved rib portion ( 51 c , 53 c ; 52 d , 53 d ) which is flexibly movable radially of the central longitudinal axis ( 9 , 18 ), and
h) wherein at least one rib portion ( 51 c ; 52 d ) is of two-piece design, producing a gap ( 72 ; 72 d ).
2. A damper according to claim 1 , wherein the guiding damping unit ( 41 c ; 41 d ) is designed for enabling the tappet ( 17 ; 17 a ) to be supported flexibly towards the casing ( 8 ; 8 a ).
3. A damper according to claim 1 , wherein the radial mobility of the rib portion ( 52 d ; 53 d ) is defined by a stop ( 55 d ).
4. A damper according to claim 1 , wherein a guide rib ( 69 ) is disposed between two adjacent damping elements ( 50 c ).
5. A damper according to claim 1 , wherein the guiding damping unit ( 41 d ) is disposed on the end ( 23 a ; 23 d ) of the tappet ( 17 a ) inside the casing.
6. A damper according to claim 1 , wherein the guiding damping unit ( 41 c ) is disposed in the vicinity of the end ( 24 ), on the side of the tappet, of the casing ( 8 ) and joined to the casing ( 8 ).
7. A damper comprising
a) a substantially tubular casing ( 8 a ) which has a central longitudinal axis ( 9 ) and an end ( 24 a ) on the side of a tappet ( 17 a ) and a free end ( 10 a );
b) the tappet ( 17 a ) which is displaceably guided in the casing ( 8 a ) and projects from the end ( 10 a ) on the side of the tappet ( 17 a ), having a central longitudinal axis ( 18 ) and an end ( 23 a ) inside the casing ( 8 a ) and a free end ( 19 a );
c) fastening elements ( 12 a , 20 a ) which are mounted on the free end ( 10 a ) of the casing ( 8 a ) and on the free end ( 19 a ) of the tappet ( 17 a );
d) a frictional damping unit ( 26 a ) for producing a given frictional damping effect between the casing ( 8 a ) and the tappet ( 17 a ); and
e) a guiding damping unit ( 41 a ) for damping and centering any deflection of the tappet ( 17 a ) crosswise of the central longitudinal axis ( 9 ) of the casing ( 8 a ),
f) wherein the guiding damping unit ( 41 a ) is composed of several damping elements ( 50 a ) of annular arrangement, relative to the central longitudinal axis ( 18 ),
g) wherein each damping element ( 50 a ) possesses at least one curved rib portion ( 52 a , 53 a ) which is flexibly movable radially of the central longitudinal axis ( 9 , 18 ),
h) wherein the at least one rib portion ( 52 a , 53 a ) is closed, enclosing a chamber ( 66 ) that is located there-behind and is open only in the axial direction, and
i) wherein the guiding damping unit ( 41 a ) has an outside diameter DSA, which is smaller than an inside diameter DGI of the casing ( 8 a ).
8. A damper according to claim 7 , wherein the radial mobility of the rib portion ( 52 a , 53 a ) is defined by a stop ( 55 a ).
9. A damper according to claim 7 , wherein the guiding damping unit ( 41 a ) is disposed on the end ( 23 a ) of the tappet ( 17 a ) inside the casing.
10. A damper comprising
a) a substantially tubular casing ( 8 ; 8 a ) which has a central longitudinal axis ( 9 ) and an end ( 24 ; 24 a ) on the side of a tappet ( 17 ; 17 a ) and a free end ( 10 ; 10 a );
b) the tappet ( 17 ; 17 a ) which is displaceably guided in the casing ( 8 ; 8 a ) and projects from the end ( 10 ; 10 a ) on the side of the tappet ( 17 ; 17 a ), having a central longitudinal axis ( 18 ) and an end ( 23 ; 23 a ) inside the casing ( 8 ; 8 a ) and a free end ( 19 ; 19 a );
c) fastening elements ( 12 , 20 ; 12 a , 20 a ) which are mounted on the free end ( 10 ; 10 a ) of the casing ( 8 ; 8 a ) and on the free end ( 19 ; 19 a ) of the tappet ( 17 ; 17 a );
d) a frictional damping unit ( 26 ; 26 a ) for producing a given frictional damping effect between the casing ( 8 ; 8 a ) and the tappet ( 17 ; 17 a ); and
e) a guiding damping unit ( 41 ; 41 a ; 41 d ) for damping and centering any deflection of the tappet ( 17 ; 17 a ) crosswise of the central longitudinal axis ( 9 ) of the casing ( 8 ; 8 a ),
f) wherein the guiding damping unit ( 41 ; 41 a ; 41 d ) is composed of several damping elements ( 50 ; 50 a ; 50 d ) of annular arrangement relative to the central longitudinal axis ( 18 ),
g) wherein each damping element ( 50 ; 50 d ) possesses at least one curved rib portion ( 51 , 53 ; 52 a , 53 a ;
52 d , 53 d ) which is flexibly movable radially of the central longitudinal axis ( 9 , 18 ),
h) wherein the radial mobility of the rib portion ( 51 , 53 ; 52 a , 53 a ; 52 d , 53 d ) is defined by a stop ( 55 ; 55 a ; 55 d ),
i) wherein the stop ( 55 ; 55 a ; 55 d ) is in the shape of a wedge.
11. A damper according to claim 10 , wherein the at least one rib portion ( 51 , 53 ; 52 a , 53 a ) is closed, enclosing a chamber ( 66 ) that is located there-behind and is open only in the axial direction.
12. A damper according to claim 10 , wherein at least one rib portion ( 52 d ) is of two-piece design, producing a gap ( 72 d ).
13. A damper according to claim 10 , wherein the guiding damping unit ( 41 a ; 41 d ) is disposed on the end ( 23 a ; 23 d ) of the tappet ( 17 a ) inside the casing.
14. A damper according to claim 10 , wherein the guiding damping unit ( 41 ) is disposed in the vicinity of the end ( 24 ), on the side of the tappet, of the casing ( 8 ) and joined to the casing ( 8 ).
15. A damper comprising
a) a substantially tubular casing ( 8 ) which has a central longitudinal axis ( 9 ) and an end ( 24 ) on the side of a tappet ( 17 ) and a free end ( 10 );
b) the tappet ( 17 ) which is displaceably guided in the casing ( 8 ) and projects from the end ( 10 ) on the side of the tappet ( 17 ), having a central longitudinal axis ( 18 ) and an end ( 23 ) inside the casing ( 8 ) and a free end ( 19 );
c) fastening elements ( 12 , 20 ) which are mounted on the free end ( 10 ) of the casing ( 8 ) and on the free end ( 19 ) of the tappet ( 17 );
d) a frictional damping unit ( 26 ) for producing a given frictional damping effect between the casing ( 8 ) and the tappet ( 17 ); and
e) a guiding damping unit ( 41 ; 41 b ; 41 c ) for damping and centering any deflection of the tappet ( 17 ) crosswise of the central longitudinal axis ( 9 ) of the casing ( 8 ),
f) wherein the guiding damping unit ( 41 ; 41 b ; 41 c ) is composed of several damping elements ( 50 ; 50 b ; 50 c ) of annular arrangement, relative to the central longitudinal axis ( 9 , 18 ),
g) wherein each damping element ( 50 ; 50 b ; 50 c ) possesses at least one curved rib portion ( 51 , 53 ; 51 b , 53 b ; 51 c , 53 c ) which is flexibly movable radially of the central longitudinal axis ( 9 , 18 ),
h) wherein the guiding damping unit ( 41 ; 41 b ; 41 c ) is disposed in vicinity of the end ( 24 ), on the side of the tappet, of the casing ( 8 ) and joined to the casing ( 8 ), and
i) wherein the rib portions ( 51 , 53 ; 51 b , 53 b ; 51 c , 53 c ) project inwards,
j) wherein at least one rib portion ( 51 c ) is of two-piece design, producing a gap ( 72 ).
16. A damper according to claim 15 , wherein at least one rib portion ( 51 ; 51 b ) is closed, enclosing a chamber ( 66 ; 66 b ) that is located there-behind, and that is open only in the radial direction.
17. A damper according to claim 15 , wherein the tappet ( 17 ) has some play towards the rib portions ( 51 b ; 51 c ).
18. A damper comprising
a) a substantially tubular casing ( 8 ) which has a central longitudinal axis ( 9 ) and an end ( 24 ) on the side of a tappet ( 17 ) and a free end ( 10 );
b) the tappet ( 17 ) which is displaceably guided in the casing ( 8 ) and projects from the end ( 10 ) on the side of the tappet ( 17 ), having a central longitudinal axis ( 18 ) and an end ( 23 ) inside the casing ( 8 ) and a free end ( 19 );
c) fastening elements ( 12 , 20 ) which are mounted on the free end ( 10 ) of the casing ( 8 ) and on the free end ( 19 ) of the tappet ( 17 );
d) a frictional damping unit ( 26 ) for producing a given frictional damping effect between the casing ( 8 ) and the tappet ( 17 ); and
e) a guiding damping unit ( 41 b ; 41 c ) for damping and centering any deflection of the tappet ( 17 ) crosswise of the central longitudinal axis ( 9 ) of the casing ( 8 ),
f) wherein the guiding damping unit ( 41 b ; 41 c ) is composed of several damping elements ( 50 b ; 50 c ) of annular arrangement, relative to the central longitudinal axis ( 9 , 18 ),
g) wherein each damping element ( 50 b ; 50 c ) possesses at least one curved rib portion ( 51 b , 53 b ; 51 c , 53 c ) which is flexibly movable radially of the central longitudinal axis ( 9 , 18 ),
h) wherein the guiding damping unit ( 41 b ; 41 c ) is disposed in the vicinity of the end ( 24 ), on the side of the tappet, of the casing ( 8 ) and joined to the casing ( 8 ),
i) wherein the rib portions ( 51 b ; 51 c ) project inwards,
j) wherein a guide rib ( 69 ) is disposed between two adjacent damping elements ( 50 b ; 50 c ), and
k) wherein the rib portions ( 51 b ; 51 c ) stand out further in the direction towards the central longitudinal axis ( 9 ) than the guide ribs ( 69 ).
19. A damper according to claim 18 , wherein at least one rib portion ( 51 b ) is closed,
enclosing a chamber ( 66 b ) that is located there-behind and that is open only in the radial direction.
20. A damper according to claim 18 , wherein at least one rib portion ( 51 c ) is of two-pieced design, producing a gap ( 72 ).
21. A damper according to claim 18 , wherein the tappet ( 17 ) has some play towards the rib portions ( 51 b ; 51 c ).
22. A damper according to claim 18 , wherein a groove ( 71 ) of substantially radial extension is arranged between each damping element ( 50 b ; 50 c ) and the adjacent guide ribs ( 69 ) offering sufficient space for deformation of the rib portions ( 53 b ; 53 c ) upon compression.
23. A damper according to claim 18 , wherein the guide rib ( 69 ) has inner surfaces ( 70 ) that are turned towards the central longitudinal axis ( 9 ) and have the cross-sectional shape of a radius around the axis ( 9 ).