Friction damper with linear actuator

Abstract

Embodiments of the invention relate to a friction damper (100) for a washing machine or a dryer, comprising a tubular hollow body (110) and a damping rod (120) arranged coaxially to each other so as to move telescopically along each other, wherein the outer diameter of the damping rod (120) is smaller than the inner diameter of the hollow body (110). The hollow body (110) further comprises a holder (130) for holding a friction unit (200). The friction unit (200) comprises: a unit body (210); a friction member (220) inside the unit body (210) to which the damping rod (120) is slidably coupled for generating a friction force on the damping rod (120); a fixed pressure element (230); a slidable pressure element (240) around at least another portion of the friction member (220); a linear actuator (260) fixed to the unit body (210) for providing a sliding motion to the slidable pressure element (240).

Description

Technical Field

[0001] This invention relates to a friction damper, specifically a friction damper with a linear actuator for use in washing machines or dryers with rotating drums. Background Technology

[0002] When a washing machine or dryer goes through various cycles (such as spinning or agitation), it can generate significant vibrations and movement. These vibrations not only produce noise but can also cause the machine to shift or move around. This can cause damage or other inconvenience.

[0003] Dampers (also known as shock absorbers or washing machine suspension legs) help mitigate these problems by absorbing and attenuating vibrations and oscillations. Washing machine or dryer dampers absorb drum motion, dissipate energy, and reduce the impact of machine movement on its surrounding environment.

[0004] Therefore, dampers in washing machines or dryers play a crucial role in stabilizing the machine, minimizing noise, and preventing excessive movement during operation.

[0005] In the prior art, a damper comprises a tubular hollow body and a rod that reciprocates within the hollow body. A seat positioned at the open end of the hollow body includes a cylindrical friction member that surrounds the rod of the damper. During reciprocating motion, the rod contacts the cylindrical friction member and dissipates its energy. This energy dissipation is affected by the gripping tightness between the cylindrical friction member and the rod (which is essentially determined by the inner radius of the friction member). However, the relationship between the generated frictional force (energy dissipation) and the radius of the friction member exhibits a wide tolerance range, typically around ±20% or even higher.

[0006] For example, due to the aforementioned tolerance range, a damper designed to produce 100N of friction may result in a damper that actually exhibits 80N or 120N of friction. In a typical washing machine, there are usually 2-5 dampers. Using dampers with varying energy absorption in a washing machine or dryer can lead to vibrations—producing unwanted noise. Adjusting the energy absorption of a damper requires replacing the cylindrical friction element and / or the mounting base. However, even with such a replacement, achieving the desired energy absorption level for the damper cannot be guaranteed.

[0007] Furthermore, the inability to adjust the friction of dampers in traditional washing machines or dryers necessitates the storage of dampers with varying friction, which significantly increases storage costs.

[0008] In addition, certain cycles of a washing machine or dryer (such as high-speed rotation) require reduced or completely eliminated damping force. Therefore, depending on the specific cycle, the damping force of the damper must be adjustable, specifically providing switching between minimum and maximum levels.

[0009] Given the aforementioned drawbacks of known washing machine dampers, there is a need for a damper that allows for adjustment or calibration of the damping force. Attached Figure Description

[0010] The accompanying drawings are provided for illustrative purposes only, and the embodiments of the present invention will be explained in detail below.

[0011] Figure 1 This is a side view of a friction damper in an exemplary embodiment of the present invention.

[0012] Figure 2 This is an exploded isometric view of a friction damper in an exemplary embodiment of the present invention. The friction damper includes a hollow body, a damping rod, and a friction unit.

[0013] Figure 3 In an exemplary embodiment of the present invention, as shown below Figure 1 The side sectional view of the friction damper shown.

[0014] Figure 4 This is an exploded view of a friction damper in an exemplary embodiment of the present invention.

[0015] Figure 5 This is an isometric view of the main body of the unit in an exemplary embodiment of the present invention.

[0016] Figure 6 This is a side view of the main body of the unit in an exemplary embodiment of the present invention.

[0017] Figure 7 This is an isometric view of a sliding pressure element in an exemplary embodiment of the present invention.

[0018] Figure 8 This is a top view of a sliding pressure element in an exemplary embodiment of the present invention.

[0019] Figure 9 This is an isometric view of the movable nut in an exemplary embodiment of the present invention.

[0020] Figure 10 This is an isometric view of a circuit board in an exemplary embodiment of the present invention, the circuit board having a first push-button switch and a second push-button switch.

[0021] Figure 11 This is a side sectional view of a friction damper in another exemplary embodiment of the present invention, the damper having two sliding circuit boards.

[0022] Figure 12 This is an exploded view of a friction damper in an exemplary embodiment of the present invention, the damper having two sliding circuit boards and two friction members.

[0023] Figure 13 This is an exploded view of a friction unit in an exemplary embodiment of the present invention, the friction unit having two sliding circuit boards and two friction members.

[0024] Figure 14 This is an isometric view of a unit body having two plate guides in an exemplary embodiment of the present invention.

[0025] Figure 15 This is a side view of a unit body having two plate guides in an exemplary embodiment of the present invention.

[0026] The component numbers shown in the diagram are as follows: Detailed Implementation Embodiments of the present invention relate to a friction damper (100) suitable for a washing machine or dryer. The friction damper (100) includes a tubular hollow body (110) and a damping rod (120), the tubular hollow body and the damping rod being arranged coaxially to each other so as to move telescopically relative to each other. The outer diameter of the damping rod (120) is smaller than the inner diameter of the hollow body (110). Therefore, the damping rod (120) is capable of reciprocating and telescoping within the hollow body (110).

[0027] The hollow body (110) includes a retainer (130) for holding the friction unit (200). The friction unit (200) includes a unit body (210), at least one friction member (220), a fixed pressure element (230), a slidable pressure element (240), a linear actuator (260), and a connecting member (300). The friction member (220) is located inside the unit body (210). The friction member (220) is slidably coupled to a damping rod (120) for generating a frictional force on the damping rod (120). The fixed pressure element (230) surrounds at least a portion of the friction member (220). The slidable pressure element (240) surrounds at least another portion of the friction member (220). The friction member (220) is located between the fixed pressure element (230) and the slidable pressure element (240). The slidable pressure element (240) is capable of sliding toward and away from the fixed pressure element (230) to apply pressure to the friction member (220). A linear actuator (260) is fixed to the unit body (210) for providing sliding motion to the slidable pressure element (240). A connecting member (300) is used to power (and / or control) the linear actuator (260).

[0028] The gap / distance between the fixed pressure element (230) and the sliding pressure element (240) can be adjusted / changed by the sliding motion of the sliding pressure element (240). The sliding motion of the sliding pressure element (240) toward the fixed pressure element (230) compresses the friction member (220), while the reverse motion of the sliding pressure element (240) relaxes the friction member (220). The sliding motion of the sliding pressure element (240) is provided by a linear actuator (260). The proximity between the fixed pressure element (230) and the sliding pressure element (240) directly affects the magnitude of the pressure applied to the friction member (220). The damping rod (120) slides frictionally (to generate friction) on the friction member (220). Therefore, the damping force applied to the damping rod (120) is proportional to the pressure applied to the friction member (220). As the distance between the fixed pressure element (230) and the sliding pressure element (240) decreases, the applied pressure increases. The pressure applied by both the fixed pressure element (230) and the sliding pressure element (240) compresses the friction member (220). The fixed pressure element (230) and the sliding pressure element (240) may compress the friction member (220) from their sides. As the pressure applied to the friction member (220) increases, the resulting frictional force (i.e., damping force) applied to the damping rod (120) also increases. The distance between the fixed pressure element (230) and the sliding pressure element (240) can be decreased by sliding the sliding pressure element (240) toward the fixed pressure element (230). Similarly, the distance between the fixed pressure element (230) and the sliding pressure element (240) can be increased by sliding the sliding pressure element (240) away from the fixed pressure element (230). In short, sliding the sliding pressure element (240) toward the fixed pressure element (230) results in a greater frictional force on the damping rod (120).

[0029] It is particularly important to apply pressure to the friction member (220) by sliding the slidable pressure element (240) toward the fixed pressure element (230). The sliding motion of the slidable pressure element (240) allows the friction member (220) to be uniformly compressed across its entire circumferential surface. The forces applied to the friction member (220) by the slidable pressure element (240) and the fixed pressure element (230) are uniformly distributed around the corresponding portions of the friction member (220). Without the sliding motion, it is impossible to achieve a consistent and uniformly distributed force on the friction member (220) in a single linear direction (the sliding direction of the slidable pressure element (240)). For example, applying force to the friction member (220) by the hinged clamping motion of a pressure element (e.g., a hinge clamp) cannot result in a uniform distribution across the surface of the friction member (220). The force applied to the portion of the friction member (220) closest to the hinge is always greater than the force applied to other portions of the friction member (220).

[0030] The friction member (220) is adapted to be positioned between the fixed pressure element (230) and the slidable pressure element (240). In one embodiment of the invention, to enhance the secure positioning of the friction member (220) between the fixed pressure element (230) and the slidable pressure element (240), the fixed pressure element (230) and / or the slidable pressure element (240) are provided with retaining protrusions (260). Thus, the friction member (220) is securely positioned both in the sliding motion direction between the fixed pressure element (230) and the slidable pressure element (240) and in a direction orthogonal to the sliding motion between the retaining protrusions (260).

[0031] In one embodiment of the invention, a retainer (130) is located at one end of the tubular hollow body (110). This positioning of the retainer (130) ensures that the friction member (220) remains easily visible. The retainer (130) also includes a circular opening (131) for receiving a damping rod (120) and at least one lateral opening (132) for receiving a friction unit (200). The lateral opening (132) is adapted to position the friction unit (200) substantially orthogonal to the hollow body (110). The positions of the circular opening (131), the lateral opening (132), and the retainer (130) together simplify the assembly process—when connecting the damping rod (120) to the friction member (220), which requires both friction and sliding connections.

[0032] In one embodiment of the invention, the friction member (220) has a cylindrical shape (see...). Figure 4 , 12-13), which surrounds at least a portion of the damping rod (120). In an alternative embodiment of this embodiment, the fixed pressure element (230) and / or the sliding pressure element (240) have concave inner surfaces, such as C-shaped, facing the friction member (220). The profile of the concave inner surface (e.g., the inner surface of the C-shape) matches the convex outer surface of the cylindrical friction member (220). The fixed pressure element (230) and the sliding pressure element (240) can compress the cylindrical friction member (220) from its opposing convex sides. This embodiment promotes a more uniform distribution of forces applied to the friction member (220) from the fixed pressure element (230) and / or the sliding pressure element (240), resulting in a more durable friction member (220). Furthermore, the friction member (220) is more firmly positioned between the fixed pressure element (230) and the sliding pressure element (240). In one version of this embodiment with a retaining protrusion (260), the retaining protrusion (260) may be located on at least one edge of the concave inner surface of the fixed pressure element (230) and / or the slidable pressure element (240).

[0033] Connecting member (300) (see) Figure 1 , 3 11) can be used to connect to a power supply unit to power the linear actuator (260). The connecting member (300) can also be used to connect a control unit to control the movement (speed and / or direction) of the linear actuator (260). The control unit can be in the form of a sensor (e.g., a stroke sensor) or include a sensor. Feedback control via a sensor can dynamically adjust the damping force of the friction damper (100) by controlling the linear actuator (260).

[0034] In one embodiment of the invention, the linear actuator (260) includes a linear motor, wherein a linearly movable portion of the linear motor is attached to a slidable pressure element (240). Linear motors inherently use fewer mechanical linkages to generate linear motion, which improves their reliability. This makes linear motors a good alternative to the linear actuator (260).

[0035] In one embodiment of the invention, the linear actuator (260) includes a rotary motor. The rotary motor includes a threaded rotor end (261) coupled to a movable nut (241) fixed to a slidable pressure element (240). The threaded rotor end (261) acts as a lead screw. The threaded rotor end (261), coupled to the movable nut (241), converts the rotational motion of the rotary motor into linear motion. The threaded rotor end (261) may have continuous threads or helical grooves along its length. The threads may have a uniform pitch, i.e., the distance between the threads. The movable nut (241) engages with the threads of the threaded rotor end (261). The movable nut (241) may have an internal thread (242) that matches the threads of the threaded rotor end (261) (see...). Figure 9 ), ball bearings or rollers. A movable nut (241) with internal threads (242) is preferred because the friction between the threads of the rotor end (261) and the internal threads (242) is sufficient to hold the movable nut (241) and thus the sliding pressure element (240) in their precise position, even when the rotary motor is not energized / not running. This friction helps maintain the position of the sliding pressure element (240) and prevents any positional displacement of the sliding pressure element (240) due to the movement of the damping rod (120) when the rotary motor is not energized / not running. The movable nut (241) moves linearly along its length as the threaded rotor end (261) rotates. The direction of rotation of the threaded rotor end (261) determines the direction of linear movement of the sliding pressure element (240). For example, clockwise rotation of the threaded rotor end (261) may cause the movable nut (241), and thus the sliding pressure element (240), to move toward the fixed pressure element (230), while counterclockwise rotation of the threaded rotor end (261) may cause the movable nut (241), and thus the sliding pressure element (240), to move away from the fixed pressure element (230). As the threaded rotor end (261) continues to rotate, the movable nut (241) moves along the length of the threaded rotor end (261). The linear displacement of the movable nut (241), and thus the sliding pressure element (240), is directly related to the number of revolutions on the threaded rotor end (261) and the thread pitch. For each full revolution, the distance the movable nut (241) moves is equal to the thread pitch of the threaded rotor end (261). The speed and accuracy of the linear motion can be controlled by adjusting the rotational speed and direction of the rotary motor. By changing the rotational speed and direction of the rotary motor, precise control of the position and speed of the linear motion of the sliding pressure element (240) can be achieved. In this way, precise control of the force applied to the friction member (220) and thus the magnitude of the damping of the friction damper (100) can be achieved.

[0036] In one embodiment of the invention, the friction unit (200) includes an actuator stop assembly. The actuator stop assembly includes a first push-button switch (271) and a second push-button switch (272), and a push-off portion (270). The push-button switch (281) may be in the form of a tactile switch. The first push-button switch (271) and the second push-button switch (272) face each other (adapted) for stopping the linear actuator (260) when either of them is closed (pushed towards the switch). The push-off portion (270) protrudes from a slidable pressure element (240)—through a position between the first push-button switch (271) and the second push-button switch (272). The push-off portion (270) is used to abut against and close the first push-button switch (271) and the second push-button switch (272) at two corresponding selected positions on the slidable pressure element (240). The push-off portion (270) is located on the slidable pressure element (240) and may be an integral part of the slidable pressure element (240). As the slidable pressure element (240) slides toward the fixed pressure element (230) via the linear actuator (260), the pusher (270)—at a selected position on the slidable pressure element (240)—abuts against and pushes / closes the first push-button switch (271). Closing the first push-button switch (271) stops the movement of the linear actuator (260) and therefore the slidable pressure element (240). The first push-button switch (271) prevents the slidable pressure element (240) from sliding further toward the fixed pressure element (230). This stopped position of the slidable pressure element (240) (a maximum position of the slidable pressure element (240)) determines the maximum pressure applied to the friction member (220), and therefore the maximum damping force of the friction damper (100). Similarly, as the slidable pressure element (240) slides away from the fixed pressure element (230) via the linear actuator (260), the pusher (270)—at a selected position on the slidable pressure element (240)—abuts against and pushes / closes the second push-button switch (272). Closing the second push-button switch (272) stops the movement of the linear actuator (260) and therefore the slidable pressure element (240). The second push-button switch (272) prevents the slidable pressure element (240) from sliding further away from the fixed pressure element (230). This stopping position of the slidable pressure element (240) (a minimum position of the slidable pressure element (240)) determines the minimum pressure applied to the friction member (220), and therefore the minimum damping force of the friction damper (100).

[0037] The position of the sliding pressure element (240) on its sliding path within the unit body (210) determines the magnitude of the pressure applied to the friction member (220). The position of the sliding pressure element (240) on the sliding path can be changed by a linear actuator (260). The linear actuator (260) can cause the sliding pressure element (240) to slide toward or away from the fixed pressure element (230) and be positioned. After the position of the sliding pressure element (240) is set, the sliding pressure element (240) maintains its position without powering the linear actuator (260).

[0038] In an alternative embodiment of this example, the first push-button switch (271) is closer to the fixed pressure element (230) than the second push-button switch (272). The distance between the first push-button switch (271) and the fixed pressure element (230) is adjustable. Alternatively, the distances between both the first push-button switch (271) and the second push-button switch (272) and the fixed pressure element (230) are adjustable.

[0039] It is desired that the damping force of the friction damper (100) is at its maximum or minimum level during certain cycles (e.g., high-speed rotation) of the washing machine or dryer. However, due to the manufacturing nature of the friction member (220) and / or friction unit (200), the desired frictional force generated by the friction member (220) on the damping rod (120) is achieved at slightly different positions on the sliding pressure element (240) along its sliding path. Therefore, the sliding pressure element (240) should be positioned / stopped at different selected positions to achieve, for example, a maximum level of 120 N or a minimum level of, for example, 0 N. To this end, during the assembly of the friction damper (100), the friction member (220) is compressed by sliding / pushing the sliding pressure element (240) toward the fixed pressure element (230) via a linear actuator (260). When the selected maximum damping force is reached, the linear actuator (260) and therefore the sliding pressure element (240) are stopped. The selected maximum damping force can be set to 120 N. This is a maximum position of the sliding pressure element (240) required to achieve the selected maximum damping force. Then, the position of the first push-button switch (271) is adjusted and fixed such that the first push-button switch (271) is pushed and closed by the pusher (270) at the maximum position of the sliding pressure element (240). In other words, the pusher (270) abuts against the sliding pressure element (240) at the maximum position. This ensures that the linear actuator (260) stops easily at the desired maximum position, thereby setting the friction damper (100) to the selected maximum damping force. Similarly, during the assembly of the friction damper (100), the sliding pressure element (240) is slid / pushed away from the fixed pressure element (230) by the linear actuator (260), thereby relaxing the friction member (220) between the sliding pressure element (240) and the fixed pressure element (230). When the selected minimum damping force is reached, the linear actuator (260) and therefore the sliding pressure element (240) are stopped. This is a minimum position of the sliding pressure element (240) required to reach the selected minimum damping force. The selected minimum damping force can be set to 0N. The position of the second push-button switch (272) is then adjusted and fixed such that the second push-button switch (272)—at the minimum position of the sliding pressure element (240)—is pushed and closed by the pusher (270). In other words, the pusher (270)—at the minimum position of the sliding pressure element (240)—abuts against the sliding pressure element (240). This ensures that the linear actuator (260) stops easily at the desired minimum position, thereby setting the friction damper (100) to the selected minimum damping force. The adjustability of the distance between the second push-button switch (272) and the fixed pressure element (230) is optional.For example, for a minimum damping force of 0N, the minimum damping force remains 0N for any of the following positions of the sliding pressure element (240): at which the distance between the sliding pressure element (240) and the fixed pressure element (230) exceeds the distance between the minimum position of the sliding pressure element (240) and the fixed pressure element (230). However, the minimum position of the sliding pressure element (240) ensures the fastest transition between the minimum and maximum positions of the sliding pressure element (240).

[0040] In an alternative embodiment, the actuator stop assembly includes at least one circuit board (273) on which a first push-button switch (271) and / or a second push-button switch (272) are located. The first push-button switch (271) and the second push-button switch (272) may be located on separate individual circuit boards (273) or on a single circuit board (273). This embodiment provides easy positioning and / or fixation of the first push-button switch (271) and / or the second push-button switch (272). In an alternative embodiment, the circuit board (273) may slide on the unit body (210). In this embodiment, the position of the first push-button switch (271) and / or the second push-button switch (272) can be changed—by sliding the circuit board (273) on the unit body (210).

[0041] In one embodiment of the invention, the unit body (210) includes a board guide (222) for supporting the circuit board (273) during sliding motion (see See Figure 5-6 14-15).

[0042] In this embodiment, during the assembly of the friction damper (100), the position of the first push-button switch (271) is adjusted and fixed by sliding the circuit board (273) on the unit body (210), such that the first push-button switch (271)—at the maximum position of the sliding pressure element (240)—is pushed and closed by the pusher (270). The sliding circuit board (273) facilitates easy adjustment and readjustment of the first push-button switch (271). Similarly, the position of the second push-button switch (272) is adjusted and fixed by sliding the circuit board (273) on the unit body (210), such that the second push-button switch (272)—at the minimum position of the sliding pressure element (240)—is pushed and closed by the pusher (270). The sliding circuit board (273) facilitates easy adjustment and readjustment of the second push-button switch (272).

[0043] In this embodiment of the invention, the friction unit (200) includes an outer cover (280) covering at least a portion of the friction unit (200). The outer cover (280) protects the friction unit (200) from any external impact. In one embodiment of the invention, the outer cover (280) and the unit body (210) include a cover fastener (281). The cover fastener (281) may be in the form of a snap-fit ​​fastener, wherein the unit body (210) has at least one cantilever, and the outer cover (280) has at least one corresponding locking hole. In an alternative embodiment, at least a portion of the outer cover (280) slides together with at least one circuit board (273). In this embodiment, the position of the circuit board (273), and therefore the first push-button switch (271) and / or the second push-button switch (272), can be adjusted by sliding this portion of the outer cover (280).

[0044] In this embodiment of the invention, the circuit board (273) includes at least one switch bracket (274) for providing support for a first push-button switch (271) and / or a second push-button switch (272). The switch bracket (274) positions the first push-button switch (271) and / or the second push-button switch (272) orthogonal to the circuit board (273) and facing each other.

[0045] In one embodiment of the invention, the unit body (210) includes an actuator housing (211) for fixing the linear actuator (260) in a fixed position within the unit body (210). The actuator housing (211) may include a rotor end inlet (223) (see...). Figure 6 and Figure 15 ), providing an opening at the threaded rotor end (261) to reach and couple with the movable nut (241) of the sliding pressure element (240).

[0046] In an exemplary embodiment of the present invention, the friction damper (100) may include an anchoring member (400) for securing the friction damper (100) to a washing machine or dryer.

Claims

1. A friction damper (100) for a washing machine or dryer, comprising: A tubular hollow body (110) and a damping rod (120) are arranged coaxially to move along each other in a nested manner, wherein the outer diameter of the damping rod (120) is smaller than the inner diameter of the hollow body (110); Its features are, The hollow body (110) includes a retainer (130) for holding the friction unit (200). The friction unit (200) includes: a unit body (210); at least one friction member (220) located inside the unit body (210), the damping rod (120) being slidably coupled to the friction member for generating frictional force on the damping rod (120); a fixed pressure element (230) surrounding at least a portion of the friction member (220); and a slidable pressure element (240) surrounding at least another portion of the friction member (220); wherein, the elements are configured such that... The friction member (220) is located between the fixed pressure element (230) and the slidable pressure element (240), and the slidable pressure element (240) is slidable toward and away from the fixed pressure element (230) to apply pressure to the friction member (220); a linear actuator (260), which is fixed to the unit body (210), is used to provide sliding motion to the slidable pressure element (240); and a connecting member (300) is used to power the linear actuator (260).

2. The friction damper (100) for a washing machine or dryer according to claim 1, wherein, The fixed pressure element (230) and / or the slidable pressure element (240) include a retaining protrusion (260) such that the friction member (220) is fixed between the fixed pressure element (230) and the slidable pressure element (240).

3. The friction damper (100) for a washing machine or dryer according to any one of the preceding claims, wherein, The retainer (130) is located at one end of the tubular hollow body (110) and includes: a circular opening (131) for receiving the damping rod (120); and at least one lateral opening (132) for receiving the friction unit (200).

4. A friction damper (100) for a washing machine or dryer according to any one of the preceding claims, wherein, The friction member (220) has a cylindrical shape; the fixed pressure element (230) and / or the slidable pressure element (240) have a concave inner surface facing the friction member (220), wherein the contour of the concave inner surface matches the convex outer surface of the cylindrical friction member (220).

5. A friction damper (100) for a washing machine or dryer according to any one of the preceding claims, wherein, The linear actuator (260) includes a linear motor, wherein a linearly movable portion of the linear motor is attached to the slidable pressure element (240).

6. The friction damper (100) for a washing machine or dryer according to any one of claims 1 to 4, wherein, The linear actuator (260) includes a rotary motor, wherein the rotary motor includes a threaded rotor end (261) coupled to a movable nut (241) fixed to the slidable pressure element (240).

7. A friction damper (100) for a washing machine or dryer according to any one of the preceding claims, wherein the friction unit (200) includes an actuator stop assembly, wherein, The actuator stop assembly includes: a first push-button switch (271) and a second push-button switch (272) facing each other for stopping the linear actuator (260) when either of them is closed; and a push portion (270) protruding from the slidable pressure element (240) through a position between the first push-button switch (271) and the second push-button switch (272).

8. The friction damper (100) for a washing machine or dryer according to claim 7, wherein, The first button switch (271) is closer to the fixed pressure element (230) than the second button switch (272); and the distance between the first button switch (271) or both the first button switch (271) and the second button switch (272) and the fixed pressure element (230) is adjustable.

9. The friction damper (100) for a washing machine or dryer according to claim 7 or 8, wherein, The actuator stop assembly includes at least one circuit board (273), wherein the first push button switch (271) and / or the second push button switch (272) are located on the circuit board.

10. The friction damper (100) for a washing machine or dryer according to claim 9, wherein, The circuit board (273) can slide on the unit body (210).

11. The friction damper (100) for a washing machine or dryer according to claim 10, wherein, The unit body (210) includes a plate guide (222) for supporting the circuit board (273) during sliding movement.

12. The friction damper (100) for a washing machine or dryer according to claim 10 or 11, wherein, The friction unit (200) includes an outer cover (280) covering at least a portion of the friction unit (200); at least a portion of the outer cover (280) slides together with at least one circuit board (273).

13. The friction damper (100) for a washing machine or dryer according to any one of claims 9 to 12, wherein, The circuit board (273) includes at least one switch bracket (274) for providing support for the first button switch (271) and / or the second button switch (272), such that the first button switch (271) and / or the second button switch (272) are positioned orthogonal to the circuit board (273) and facing each other.

14. A friction damper (100) for a washing machine or dryer according to any one of the preceding claims, wherein, The unit body (210) includes an actuator housing (211) for fixing the linear actuator (260) in a fixed position within the unit body (210).

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