Friction damper
A friction damper includes a housing having a longitudinal axis, a tappet that is displaceable along the longitudinal axis, a friction unit for generating a direction-dependent friction force on the tappet, wherein the friction unit includes at least one friction lining that rests frictionally on the tappet and a friction lining carrier on which the at least one friction lining is held, wherein the friction lining carrier is arranged to be displaced relative to the tappet between an extraction position and an insertion position, as well as a switching unit for variably setting the friction force, wherein the switching unit includes a switchable actuator, a locking element and a force transmission unit which is mechanically coupled to the actuator and to the locking element, wherein the force transmission unit comprises a threaded spindle.
1 . A friction damper comprising
a. a housing having a longitudinal axis,
b. a tappet that is displaceable along the longitudinal axis,
c. a friction unit for generating a direction-dependent friction force on the tappet, wherein the friction unit comprises at least one friction lining that rests frictionally on the tappet and a friction lining carrier on which the at least one friction lining is held, wherein the friction lining carrier is arranged to be displaced relative to the tappet between an extraction position and an insertion position,
d. a switching unit for variably setting the friction force, wherein the switching unit comprises
i. a switchable actuator,
ii. a locking element, wherein the locking element has a spindle nut that interacts with a threaded spindle, wherein the spindle nut is integrally designed on the locking element,
iii. a force transmission unit which is mechanically coupled to the actuator and to the locking element, wherein the force transmission unit comprises the threaded spindle.
2 . The friction damper according to claim 1 , wherein the friction lining carrier has at least one friction lining receptacle in which the at least one friction lining is arranged.
3 . The friction damper according to claim 2 , wherein two friction linings are provided.
4 . The friction damper according to claim 3 , wherein the two friction linings each have a half-shell contour.
5 . The friction damper according to claim 1 , wherein the friction damper has a first fastening element and a second fastening element for fastening to parts which are movable relative to one another.
6 . The friction damper according to claim 5 , wherein the first fastening element is arranged on the housing.
7 . The friction damper according to claim 5 , wherein the second fastening element is arranged on the tappet.
8 . The friction damper according to claim 1 , wherein the locking element is configured as a linearly displaceable sliding element.
9 . The friction damper according to claim 8 , wherein the locking element is slidable in a direction perpendicular to the tilting axis.
10 . The friction damper according to claim 1 , wherein the actuator is configured as an electric motor.
11 . The friction damper according to claim 10 , wherein the electric motor is configured as a DC motor.
12 . The friction damper according to claim 1 , wherein the locking element has at least one abutment surface with which the locking element in the locked arrangement abuts against at least one locking surface of the friction lining carrier.
13 . The friction damper according to claim 1 , wherein the locking element has an opening for collision-free displacement of the locking element along the longitudinal axis.
14 . The friction damper according to claim 1 , wherein the threaded spindle is configured with self-locking.
15 . The friction damper according to claim 1 , wherein the threaded spindle is configured without self-locking.
16 . The friction damper according to claim 1 , comprising a failsafe unit for a failsafe function of the friction damper for placing the locking element in a locked arrangement on the friction lining carrier in such a manner that a maximum direction-independent friction force is effective.
17 . The friction damper according to claim 1 , wherein the friction lining carrier is arranged in the housing so as to be tiltable about a tilting axis, wherein the tilting axis is arranged transversely with respect to the longitudinal axis.
18 . The friction damper according to claim 1 , wherein the friction lining carrier has a through-opening through which the tappet is guided, wherein the through-opening has a contour which is asymmetrical at least in sections perpendicularly to the longitudinal axis.
19 . The friction damper according to claim 1 , wherein the friction lining carrier has a through opening through which the tappet is guided, wherein the friction lining receptacle is configured as a depression in the through opening.
20 . The friction damper according to claim 1 , wherein the spindle nut is integrally connected with the locking element to form a one-piece spindle nut and locking element structure.
21 . A friction damper comprising
a. a housing having a longitudinal axis,
b. a tappet that is displaceable along the longitudinal axis,
c. a friction unit for generating a direction-dependent friction force on the tappet, wherein the friction unit comprises at least one friction lining that rests frictionally on the tappet and a friction lining carrier on which the at least one friction lining is held, wherein the friction lining carrier is arranged to be displaced relative to the tappet between an extraction position and an insertion position,
d. a switching unit for variably setting the friction force, wherein the switching unit comprises
i. a switchable actuator,
ii. a locking element,
iii. a force transmission unit which is mechanically coupled to the actuator and to the locking element, wherein the force transmission unit comprises a threaded spindle, wherein the force transmission unit comprises a gear, wherein the gear is configured as a reduction gear, wherein the actuator has a drive pinion on the motor shaft, which interacts with an internal toothing on the gear spindle, wherein the internal toothing is integrally designed in a sleeve section of the threaded spindle and is firmly coupled to the movement thread of the threaded spindle.
22 . The friction damper according to claim 21 , wherein the actuator comprises the motor shaft, wherein the actuator is configured to move the motor shaft.
23 . A friction damper comprising
a. a housing having a longitudinal axis,
b. a tappet that is displaceable along the longitudinal axis,
c. a friction unit for generating a direction-dependent friction force on the tappet, wherein the friction unit comprises at least one friction lining that rests frictionally on the tappet and a friction lining carrier on which the at least one friction lining is held, wherein the friction lining carrier is arranged to be displaced relative to the tappet between an extraction position and an insertion position,
d. a switching unit for variably setting the friction force, wherein the switching unit comprises
i. a switchable actuator,
ii. a locking element,
iii. a force transmission unit which is mechanically coupled to the actuator and to the locking element, wherein the force transmission unit comprises a threaded spindle, wherein the displacement transducer is held on the tappet by means of a magnet holder, said magnet holder has a fastening section with which the magnet holder is axially slidable attached to the tappet and is fastened therein.
24 . The friction damper according to claim 23 , wherein the magnet holder comprises a magnet holder recess, wherein displacement transducer comprises a magnet, the magnet being arranged in the magnet holder recess.