EP3303680B1

EP3303680B1 - Vibration dampening device, electrical household appliance and manufacturing process of said device

Info

Publication number: EP3303680B1
Application number: EP16721015.2A
Authority: EP
Inventors: Ismael Gracia Bobed; Eduardo GRACIA CANO
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2015-05-29
Filing date: 2016-05-02
Publication date: 2019-02-27
Anticipated expiration: 2036-05-02
Also published as: CN107667192A; WO2016193832A1; CN107667192B; ES2592572B1; TR201903897T4; ES2718973T3; PL3303680T3; RU2675472C1; EP3303680A1; ES2592572A1

Description

OBJECT OF THE INVENTION

The present invention relates to a vibration dampening device for a washing tub of a washing or drying machine also comprising a housing, the device comprising: A first articulating piece, with a first end and a second end, the first end of the first articulating piece being provided to be connected to the washing tub in an articulated manner by means of a first articulation that allows rotation around a first rotation axis, a second articulating piece, with a first end and a second end, the first end of the second articulating piece being connected to the second end of the first articulating piece in an articulated manner by means of a second articulation that allows rotation around a second rotation axis, and the second end of the second articulating piece being provided to be connected to the housing by means of a third articulation that allows rotation around a third rotation axis, in which the first articulation, the second articulation and/or the third articulation is an articulation that provides frictional resistance to rotation having a bushing, which can be crossed in the rotation axis by a bolt connectable to at least one lug.
In particular the invention relates to a vibration dampening device of the radial type to dampen the oscillation occurring in an oscillating element, which is particularly adequate to dampen the vibrations in the washing tub of a washing or drying machine.

BACKGROUND OF THE INVENTION

Documents WO 2013/175372 A1 and WO 2012/069987 A1 each disclose a vibration dampening device as defined above.
Document AT 218995 shows a vibration dampening device for the oscillation in a washing machine. This device allows to dampen the oscillation generated by the drum of the washing machine by means of a device comprising a supporting element, an articulating piece and a rotating articulation. This configuration aims at achieving a way to dampen the oscillations by means of a rotating dampening system. Nevertheless, this configuration is conditioned by the mechanical and thermal properties of the pieces it is composed of as well as by the friction values that can be predetermined in each of the possible friction articulations.

DESCRIPTION OF THE INVENTION

The present invention provides a solution to overcome this technical problem by a vibration dampening device, a manufacturing process and a washing or drying machine. Preferred embodiments of the invention are defined in the dependent claims.
A first inventive aspect of the invention refers to a vibration dampening device for a washing tub of a washing or drying machine also comprising a housing. Said device comprises a first articulating piece, with a first end and a second end, the first end of the first articulating piece being provided to be connected to the washing tub in an articulated manner by means of a first articulation that allows rotation around a first rotation axis, a second articulating piece, with a first end and a second end, the first end of the second articulating piece being connected to the second end of the first articulating piece in an articulated manner by means of a second articulation that allows rotation around a second rotation axis, and the second end of the second articulating piece being provided to be connected to the housing by means of a third articulation that allows rotation around a third rotation axis, in which the first
articulation, the second articulation and/or the third articulation is an articulation that provides frictional resistance to rotation having a bushing, which can be crossed in the rotation axis by a bolt connectable to at least one lug, so that a friction element can be arranged being trapped between the bushing and the at least one lug, wherein the friction element is fixedly connected to one from the bushing and the lug.
In a radial dampening device, an articulation that provides frictional resistance to rotation or a friction articulation is to be understood as an articulation in which the friction values during a rotation of the same exceed 10 N, the values ranging preferably from 20 N to 120 N and, more preferably, from 30 N to 60 N.
Having the friction element fixed to the lug or to the bushing gives the advantage that it is possible to predetermine the frictional forces in the friction articulation by means of parameters such as the friction surface or the friction coefficient of the materials. Thereby, values controllable within the desired working ranges are obtained in comparison with an articulation in which the friction element is freely arranged between both elements (the lug and the bushing), not being possible in this case to control the frictional forces originated in said articulations due to the uncontrolled relative rotation between the elements. When the friction element is fixedly arranged at the lug, it exerts friction against the bushing while, when the friction element is fixedly arranged at the bushing, it exerts a frictional force against the lug.
Its utilization in devices such as washing or drying machines allows the limitation of the movement of elements that generate oscillations mainly due to the high inertias produced in acceleration and deceleration stages of the drum inside the washing tub together with the lack of uniformity in the distribution of the load of the clothes inside the washing tub and the diameter said washing tubs have to increase the load of laundry washed in just one washing cycle.
The articulation that provides frictional resistance to rotation comprises a bushing, which is crossed in the rotation axis by a bolt connected to at least one lug, so that a friction element is arranged being trapped between the bushing and the at least one lug. In a preferred manner, the bolt is connected to two lugs preferably arranged in a U-shaped configuration, each on one side of the bushing, what makes the structure of the articulation more rigid. Both lugs can clamp the bushing strongly and have a friction element between the bushing and the same.
The bolt is connected to the at least one lug. This connection can be realized by different connecting means such as screwing, by a nut, by welding, utilizing adhesive means or similar fixing means.
The bushing can be arranged at an end of one of the articulating pieces and, then, the lugs can be arranged at an end of the other articulating piece and/or in the washing tub and/or in the housing, or the bushing can be arranged in the washing tub and/or in the housing and the lugs can be arranged at an end of one of the articulating pieces. With this, the articulation providing frictional resistance to rotation can be arranged in any of the three, i.e. first, second and third articulation. Preferably, the friction element is made of a high-compression material, in particular an expanded polyurethane sponge, e.g. from Cellasto ®.
In a particular embodiment, the friction element is connected to the bushing or the lug in a positive fit. This type of connection has the advantage of being very economical and easy to be industrialized. The simplest and easiest way to industrialize it consists in making a recess in the lug or the bushing, where the friction element is fixed in a positive fit with no possibility of movement. In this manner, no additional fixing elements are required.
Positive-fit connections are the simplest way to connect the friction element either to the lug or the bushing. Nevertheless, if it is necessary and if the connection requires it, additional fixing means can be added between the friction element and the component where it is fixed (lug or bushing) such as adhesive means or other equivalent fixing means.
In a particular embodiment, the friction element is disc-shaped with an opening crossable by the bolt. In the friction articulation, there is a bolt-like element that performs the function consisting in clamping the bushing in one of the articulations against the at least one lug of the other articulation. The advantage of this embodiment is that the friction element is already prepared to be crossed by the bolt as well as the fact of being disc-shaped and, therefore, substantially flat to facilitate the housing, the clamping and the fixation of the same, either to the lug or to the bushing, in the friction articulation.
In a particular embodiment, the perimeter of the friction element is polygonal. The advantage of this embodiment is that, since the friction element has edges and angles, its immobilization is easier taking advantage of its own geometry in the lug or the bushing. No connecting elements additional to the lug or the bushing are required in the friction articulation. Furthermore, the fact of no additional elements being required reduces the cost and makes the industrialization process of the same much easier.
In a particular embodiment, the perimeter of the friction element_is square, triangular or hexagonal. The friction element can be industrially produced in the form of a sheet from which the friction elements are cut having the adequate geometry and shapes for the friction articulations. The advantage of utilizing geometries such as the square, the triangle or the hexagon is that almost the entire sheet from which the friction element is obtained can be utilized. Thereby, the amount of material that cannot be utilized is reduced and the total costs and the waste of the dampening device are also reduced.
Those embodiments in which both the lug and the bushing are made of a thermally conductive material are preferred, but if the lug or the bushing is not made of a thermally conductive material, it is advantageous to fix the friction element in the element, either the lug or the bushing, made of a thermally non-conductive material and that the other element, the bushing or the lug respectively, made of a thermally conductive material, has relative movement with respect to the friction element and rubs against it. This configuration gives the advantage consisting in providing an evacuation path for the heat generated by the friction occurring in the articulation that provides frictional resistance to rotation, in such a manner that the risk of overheating due to a prolonged functioning of said device is avoided, which could damage or even destroy the friction element of the same.
A thermally conductive material is to be understood as a material having a thermal conductivity higher than 5 W/(m·K), preferably higher than 10 W/(m·K), and more preferably higher than 40 W/(m·K).
In a particular embodiment, the thermally conductive material is a metal such as, for example, steel, aluminium, zinc, copper, zamak, stainless steel, bronze, brass and/or titanium or alloys thereof or any material having an adequate thermal conductivity.
In a particular embodiment, the first articulating piece and/or the second articulating piece are made of a metallic material and comprises the bushing integrated therein. This device gives the advantage of providing an articulating piece with better mechanical properties, enabling the device to withstand higher loads and to reduce the volume of the elements configuring the device. The utilization of this dampening system in a washing or drying machine frees space inside the same, which can be employed for different uses. Furthermore, the fact that the bushing is integrated in one of the articulating pieces gives the advantage of reducing the number of pieces of the dampening device as well as the costs of the same and the number of operations required for the manufacturing of the dampening device.
In a particular embodiment, the articulating piece made of the metallic material comprises the at least one lug integrated therein. The integration of the lug into one of the articulating pieces gives the advantage consisting in the reduction of the number of pieces of the dampening device as well as of the costs of the same and the number of operations required for the manufacturing of the dampening device.
In a particular embodiment, the second articulating piece is made of a plastic material with the bushing integrated therein which, in the third articulation, is susceptible of being connected to the at least one lug made of a metallic material of the housing of the washing or drying machine and the friction element is connected to the bushing in a positive fit. The advantage of this configuration is that the entire surface of the housing can be utilized as a radiating element to dissipate the heat generated in the friction articulation.
In a particular embodiment, the second articulation is an articulation providing frictional resistance to rotation, wherein the bolt connects the at least one lug with the bushing under pressure with a predetermined force, the friction element being arranged between both of them. This embodiment has the advantage of making the determination of the frictional force of the dampening device in the own assembly line of the same easier, since it can be verified if the device comes out having the desired frictional force and it can be even adjusted in the own manufacturing facilities if required.
In a particular embodiment, the first and/or the third articulation is an articulation providing frictional resistance to rotation, wherein the bolt connects the at least one lug with the bushing under pressure with a predetermined force, the friction element being arranged between both of them and the at least one lug being fixed to a support of the lugs and the support of the lugs being fixable to the housing or to the washing tub. This embodiment gives the advantage consisting in a much easier determination or fixation of the nominal frictional force of the dampening device. The dampening device can leave the assembly line having a fixed nominal frictional force. This frictional force can be measured and verified in the own assembly line and, if required, adjusted to an objective value, which is the nominal value at which it is desired that the device works. This is not easily realizable in the case that the adjustment through the bolt has to be carried out when the dampening device is mounted in the oscillating element in which it is going to work.
A second inventive aspect of the invention refers to a manufacturing process of a vibration dampening device having at least a friction articulation that is manufactured following the steps of arranging at least a friction element between the bushing and a lug, connecting the friction element to the bushing or the lug, crossing the preceding set with a bolt, trapping the lug against the bushing under a prefixed pressure.
The advantage of such process is being able to prefix the frictional force in the own assembly line of the dampening device. In addition to prefixing this frictional force, a quality control and of verification of the same can be carried out, what guarantees the production process of the dampening device.
In the case of washing or drying machines, said friction articulation can be fixed in any of the walls of the housing and/or in the washing tub.
A third inventive aspect of the invention refers to a washing or drying machine comprising at least one vibration dampening device according to the first inventive aspect.
The vibration dampening devices can be fixed to the sides of the housing or to the lower part of the housing or in parallel to the suspension elements in the upper or lower part of the washing tub. Said washing or drying machine can contain a plurality of dampening devices placed on one or both sides of the washing tub.
All features and/or steps of methods described in this specification (including the patent claims, the description and the drawings) can be combined in any combination, except for those mutually excluding combinations of such features.

DESCRIPTION OF THE DRAWINGS

These and further features and advantages of the invention are now described in greater detail by means of the following detailed description of a preferred embodiment. This embodiment is to be understood as an illustrative and non-limiting example, with reference to the attached figures.

Figure 1: shows a particular embodiment of a vibration dampening device according to the invention.
Figure 2: shows a particular embodiment of a friction articulation of a vibration dampening device according to the invention.
Figure 3: shows a second particular embodiment of a friction articulation of a vibration dampening device according to the invention.
Figure 4: shows a perspective view of an articulating piece of a vibration dampening device according to figure 3.
Figure 5: shows a section of a particular embodiment of an articulating piece of a vibration dampening device according to figure 3.
Figure 6: shows an exploded view of a particular embodiment of a friction articulation of a vibration dampening device according to the invention.
Figure 7: shows a side view of a particular embodiment of a second articulating piece of a vibration dampening device according to the invention.
Figure 8: shows a pattern of a particular embodiment in the form of a hexagonal perimeter of a friction element.
Figure 9: shows a feasible configuration of a washing or drying machine containing at least one vibration dampening device according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Figure 1 shows a particular embodiment of a vibration dampening device 1 according to the invention in a situation of use, installed in a washing or drying machine 44. In this figure, the following elements can be observed, which form part of this vibration dampening device 1:

A first articulating piece 2, with a first end 21 and a second end 22. The first end 21 of the first articulating piece 2 is connected to the washing tub 10 in an articulated manner by means of a first articulation 4 that allows rotation around a first rotation axis.
A second articulating piece 3, with a first end 31 and a second end 32. The first end 31 of the second articulating piece 3 is connected to the second end 22 of the first articulating piece 2 in an articulated manner by means of a second articulation 5 that allows rotation around a second rotation axis, and the second end 32 of the second articulating piece 3 is connected to the housing 11 by means of a third articulation 6 that allows rotation around a third rotation axis.

In this particular example of the dampening device 1 of the invention, the first articulating piece 2 and the second articulating piece 3 are made of a metallic material. In other embodiments, only one from the first articulating piece 2 and the second articulating piece 3 is a metallic piece.
In this particular example, both the connection between the first end 21 of the first articulating piece 2 and the tub 10 and the connection between the second end 32 of the second articulating piece 3 and the housing 11 are articulations provided by respective plastic pieces extending through orifices comprised at the ends of the pieces to be connected, said plastic pieces having stops at their ends destined to avoid that the plastic pieces slip out of the orifices.
In this particular embodiment shown in figure 1, the second articulation 5 is the articulation that provides frictional resistance to rotation. This articulation comprises a bushing 7 integrated in the first end 31 of the second articulating piece 3, which is_crossed in the rotation axis by a bolt 8 fixedly arranged at the lugs 12, so that a friction element 9 is arranged being trapped between the bushing 7 and the lugs .12 The friction element 9 opposes rotation between said elements. The friction element 9 must be fixedly arranged either at the bushing 7, so that friction is exerted on lugs 12, or at lugs 12, so that friction is exerted on the bushing 7.
Figure 2 shows a detailed view of the second articulation 5 of figure 1, which is an articulation providing frictional resistance to rotation. This second articulation 5 comprises a bushing 7 corresponding to the first end 31 of the second articulating piece 3, which is crossed in the rotation axis by a bolt 8 connected to the lugs 12 arranged at the second end 22 of the first articulating piece 2, so that a friction element 9 is arranged being trapped between the bushing 7 and the lugs 12.
Figure 3 shows a variant of a friction articulation, in which the third articulation 6 is the articulation providing frictional resistance to rotation. In this case, this third articulation 6 comprises lugs 12 arranged being fixed to the housing 11 and a bushing 7 corresponding to the second end 32 of the second articulating piece 3, which is crossed in the rotation axis by a bolt 8 connected to the lugs 12, so that a friction element 9 is arranged being trapped between the bushing 7 and the lugs 12. This is an alternative configuration to the configuration shown in figure 2, the general functioning of the system being the same, except for the fact that the articulation providing frictional resistance to rotation is in this case the third articulation 6 and, in figure 2, it is the second articulation 5 the one providing frictional resistance to rotation.
To increase friction if it is required, it is provided that the friction element can be arranged at the same time between the bushing and the bolt and between the bushing and the lug. In this case, the friction element can be made in just one piece.
Figure 4 shows a perspective view of the third articulation 6 and of the second articulating piece 3. In said figure, the third articulation 6 is an articulation providing frictional resistance to rotation. The second articulating piece 3 can be observed having a bushing 7 integrated in each of its ends 31, 32. The bushing 7 is trapped by the lugs 12. In this case, the lugs 12 are fixedly arranged at the support of the lugs 20. Both the bushing 7 and the lugs 12 are crossed by a bolt 8 and, in addition to that, the friction elements 9 are trapped between the lugs 12 and the bushing 7. In this case, the friction elements 9 have a hexagonal perimeter, are substantially flat and have a through-hole in the centre to be crossed by the bolt 8. The lugs 12 could be fixed to the support of the lugs 20 by means of connecting elements such as screws, rivets, or by means of processes such as gluing, welding or the like. This construction allows fixation of the friction articulation of the dampening device 1 in any location of the oscillating element to be dampened by it. In the case, for example, of washing machines, the support of the lugs 20 can be fixed in any location of the housing 11 or of the washing tub 10.
Figure 5 shows a section of a particular embodiment of a third articulation 6 and of the second articulating piece 3, which is connected to said third articulation 6. It can be observed how the bushing 7 integrated in the second end 32 of the second articulating piece 3 is arranged being trapped between the lugs 12 integrated in this case in the support of the lugs 20. Both the lugs 12 and the bushing 7 are crossed by the bolt 8. In this case, the friction element 9 is disc-shaped and is partially housed in the recess 13 of the bushing 7 of the second articulating piece 3. In figure 5, it can be also observed that, in this case, the friction articulation 6 has 2 disc-shaped friction elements 9, one on each side of the bushing 7. The friction element 9 could also be entirely housed in the recess 13 of the bushing 7.
To increase the friction surface, the friction element 9 can be arranged both between the lugs 12 and the bushing 7 (as it is represented in figure 5) and between the bushing 7 and the bolt 8. In that case, the friction element 9 can be made in just one piece to reduce the assembly costs of the dampening device 1 or can be composed of several independent friction elements.
Figure 6 shows an exploded view of a friction articulation according to the invention. In this case, the third articulation 6 is the articulation providing frictional resistance to rotation. The second articulating piece 3 has a bushing 7 integrated in its second end 32. Said bushing 7 has a recess 13 to fix the friction element 9. The friction element 9 has a hexagonal perimeter provided to be fixed in a positive fit in the recess 13 of the bushing 7 of the second end 32 of the second articulating piece 3. In this case, it exerts frictional resistance to rotation against the lug 12. The friction element 9 has also a circular through-hole in its centre to be crossed by the bolt 8. The bolt 8 extends through both the lugs 12 and the bushing 7 and the friction elements 9 and is fixedly arranged at the lugs 12. The lugs 12 are integrated in the support of the lugs 20.
Figure 6 represents the claimed manufacturing process. A dampening device 1 can be manufactured by means of a support of lugs 20 including two substantially parallel lugs 12 between which the bushing 7 of the second end 32 of the second articulating piece 3 can be housed. The bushing 7 has a recess 13 at each of its sides, where the friction element 9 is housed in a positive fit. Subsequently, the lugs 12 clamp the bushing 7 by the force exerted by the bolt 8.
Figure 7 shows a side view of a particular embodiment of a second articulating piece 3 according to the invention. In this figure, the bushing 7 can be observed in greater detail being integrated both in the first end 31 and in the second end 32. The bushing 7 of the second end 32 also contains a recess 13 of a hexagonal perimeter to facilitate the housing in a positive fit of a friction element 9 also having a hexagonal perimeter. In this case, a ribbing to reinforce the connection between the internal part and the external part of the bushing 7 can be also observed. This part could be also solid instead of ribbed in another particular embodiment.
Figure 8 shows a pattern of a particular embodiment of a hexagonal perimeter of a friction element 9. It can be seen how the friction element can be manufactured in substantially flat sheets and, from them, the friction elements 9 can be cut. The hexagonal perimeter makes the maximum utilization of the material possible to produce the friction elements 9 by reducing the waste. This results in a reduction in price of the friction element 9 and, therefore, of the dampening device 1.
Figure 9 shows a feasible configuration of a washing or drying machine 44 containing at least one vibration dampening device 1 according to the invention. In this particular example, a washing tub 10 is shown, which comprises a drum 28 actuated by a motor 25 that transmits the movement to the drum 28 by means of a pulley mechanism 29 fixedly arranged at the drum 28 and connected to the actuating element by a belt 27. Said washing tub 10 is connected to the housing 11 by means of suspension elements 17 and two vibration dampening devices 1 according to the invention. As it is shown in figure 9, the vibration dampening devices 1 are fixed to the sides of the housing 11 but they could be fixed to the lower part of the housing 11 or in parallel to the suspension elements 17 in the top or lower part of the washing tub 10.
A preferred embodiment comprises three dampening devices 1, two of them preferably arranged on a side of the washing tub 10 and the third one on the other side of said washing tub 10.
It is also possible to arrange four dampening devices 1, two preferably arranged on each side of the washing tub 10.

LIST OF REFERENCES

1.: Vibration dampening device
2.: First articulating piece
3.: Second articulating piece
4.: First articulation
5.: Second articulation
6.: Third articulation
7.: Bushing
8.: Bolt
9.: Friction element
10.: Washing tub
11.: Housing
12.: Lug
13.: Recess
17.: Suspension element
20.: Support of the lugs
21.: First end of the first articulating piece
22.: Second end of the first articulating piece
25.: Motor
27.: Belt
28.: Drum
29.: Pulley
31.: First end of the second articulating piece
32.: Second end of the second articulating piece
44.: Washing or drying machine

Claims

A vibration dampening device (1) for a washing tub (10) of a washing or drying machine (44) also comprising a housing (11), the device comprising:
a first articulating piece (2), with a first end (21) and a second end (22), the first end (21) of the first articulating piece (2) being provided to be connected to the washing tub (10) in an articulated manner by means of a first articulation (4) that allows rotation around a first rotation axis,

a second articulating piece (3), with a first end (31) and a second end (32), the first end (31) of the second articulating piece (3) being connected to the second end (22) of the first articulating piece (2) in an articulated manner by means of a second articulation (5) that allows rotation around a second rotation axis, and the second end (32) of the second articulating piece (3) being provided to be connected to the housing (11) by means of a third articulation (6) that allows rotation around a third rotation axis, in which the first articulation (4), the second articulation (5) and/or the third articulation (6) is an articulation that provides frictional resistance to rotation having a bushing (7), which can be crossed in the rotation axis by a bolt (8) connectable to at least one lug (12),
characterized in that
a friction element (9) is arranged being trapped between the bushing (7) and the at least one lug (12), and the friction element (9) is fixedly connected to the bushing (7) or the lug (12).
The vibration dampening device (1) according to claim 1, characterized in that the friction element (9) is fixed to the bushing (7) or the lug (12) in a positive fit with no possibility of movement.
The vibration dampening device (1) according to one of the preceding claims, characterized in that the friction element (9) is disc-shaped with an opening crossable by the bolt (8).
The vibration dampening device (1) according to claim 3, characterized in that the perimeter of the friction element (9) is polygonal.
The vibration dampening device (1) according to claim 4, characterized in that the perimeter of the friction element (9) is square, triangular or hexagonal.
The vibration dampening device (1) according to one of the preceding claims, characterized in that the bushing (7) and/or the lug (12) are made of a thermally conductive material and, if one from the bushing (7) or the lug (12) is not made of a thermally conductive material, the friction element (9) is fixedly connected to this.
The vibration dampening device (1) according to one of the preceding claims, characterized in that the first articulating piece (2) and/or the second articulating piece (3) are made of a metallic material and comprises the bushing (7) integrated therein.
The vibration dampening device (1) according to claim 7, characterized in that the articulating piece (2, 3) made of the metallic material comprises the at least one lug (12) integrated therein.
The vibration dampening device (1) according to one of claims 1 to 5, characterized in that the second articulating piece (3) is made of a plastic material with the bushing (7) integrated therein which, in the third articulation (6), is susceptible of being connected to the at least one lug (12) made of a metallic material of the housing (11) of the washing or drying machine (44) and the friction element (9) is fixed to the bushing (7) in a positive fit with no possibility of movement.
The vibration dampening device (1) according to one of the preceding claims, characterized in that the second articulation (5) is an articulation providing frictional resistance to rotation, wherein the bolt (8) connects the at least one lug (12) with the bushing (7) under pressure with a predetermined force, the friction element (9) being arranged between both of them.
The vibration dampening device (1) according to one of the preceding claims, characterized in that the first (4) and/or the third articulation (6) is an articulation providing frictional resistance to rotation, wherein the bolt (8) connects the at least one lug (12) with the bushing (7) under pressure with a predetermined force, the friction element (9) being arranged between both of them and the at least one lug (12) being fixed to a support of the lugs (20) and the support of the lugs (20) being fixable to the housing (11) or to the washing tub (10).
A manufacturing process of a vibration dampening device (1) according to preceding claims having at least a friction articulation, characterized in the steps of arranging at least a friction element (9) between the bushing (7) and a lug (12), connecting the friction element (9) to the bushing (7) or to the lug (12), crossing the preceding set with a bolt (8), trapping the lug (12) against the bushing (7) under a prefixed pressure.
A washing or drying machine (44) comprising at least one vibration dampening device (1) according to any of claims 1 to 11.