KR20210054693A - Engine mount device - Google Patents

Abstract

The present invention relates to an engine mount device, where a decoupler body composed of a magnetofluid elastomer is closely attached to a mounting surface of a decoupler of an upper plate of a core by magnetic coupling to reduce vibration of an engine or the decoupler body is spaced from the upper plate of the body to absorb vibration of the engine.

Description

Engine mount device {ENGINE MOUNT DEVICE}

The present invention relates to an engine mount device capable of attenuating engine vibration or absorbing engine vibration by magnetic coupling applied to a decoupler.

In a vehicle, the engine can be regarded as a kind of vibration generator. Therefore, when the engine is mounted on a vehicle body, vibrations generated by the engine and transmitted to the vehicle body and the transmission of noise due thereto are reduced by mounting the engine using a medium called an engine mount device.

In general, in the case of small gasoline engine vehicles, a bush-type mount device made of rubber is mainly used, and in the case of large gasoline engine vehicles and diesel engines, a fluid-sealed engine mount device with a fluid enclosed inside is used. . However, such a passive engine mount device could not reduce vibration and noise in all ranges of a variable driving range due to its structure.

In general, vibrations generated by engines occur differently in idle state, low speed operation state, and high speed operation state, so dynamic stiffness of different engine mount devices is required in idle state, low speed operation state, and high speed operation state. do. That is, low dynamic stiffness is required in the idle state and high-speed driving, and high attenuation is required in the low-speed driving state in which a large vibration enters.

Looking at this in relation to the frequency of vibration generated by the engine, it can be divided into a shake region where low-frequency large displacement vibration occurs, an idle region in which medium-frequency medium displacement vibration occurs, and a booming region in which high-frequency low-frequency vibration is generated. In order to have a more excellent vibration damping effect, the engine mount device should have different dynamic stiffness according to each of these areas.

However, the bush-type engine mount device or the fluid-sealed hydraulic-type engine mount device as described above cannot have a vibration damping function in all regions that are variable due to its structure. Accordingly, in recent years, an active engine mounting device (or a switching engine mounting device) has been developed to enable control in all areas against such a variable engine vibration.

Meanwhile, Korean Patent No. 10-0246665 "Fluid-filled engine mount with adjustable damping force" provides an auxiliary diaphragm between the upper liquid chamber and the air chamber, so that when the vibration of high-frequency micro-displacement is input to the engine mount, it forms the air chamber. The diaphragm flows (ie, vibrates) to absorb the pressure change in the upper liquid chamber.

In addition, Korean Patent Laid-Open No. 10-2010-0124299 "Multi-stage switchable inertial track assembly" causes the decoupler to vibrate freely to generate a decoupling state for low input displacement, or to vacuum the decoupler by switching to a vacuum port. When this is applied, the decoupler is made to achieve a state in which it cannot vibrate.

In the above, the auxiliary diaphragm to the decoupler are collectively referred to as a decoupler hereinafter, and the conventional techniques are considered to be integrated in the present specification.

In order to apply a vacuum to the decoupler in the same manner as in Korean Patent Laid-Open No. 10-2010-0124299, a vacuum device must be provided outside the mount device, and in order for the vacuum pressure to be transferred from the vacuum device to the decoupler, a certain amount of time is required. As long as it is delayed, it becomes difficult to have a fast reaction speed.

In addition, as an active engine mount device, Korean Patent Registration No. 10-1288995 "Switching Engine Mount Device" (registered on July 17, 2013), Korean Patent Registration No. 10-1288997 "Switching Engine Mount Device" (registered on July 17, 2013), Registered in Korea. Patent No. 10-1573436 "An engine mount device using magnetic fluid elastomer" (registered on November 25, 2015) has been proposed.

Republic of Korea Patent Registration No. 10-1288997 "Switching engine mount device" is a technology that makes contact with the decoupler or spaced apart by moving a separate vibration blocking member reciprocating in order to allow or block the vibration of the decoupler. This method has a problem that the vibration isolating member applies a continuous shock to the decoupler.

Meanwhile, Korean Patent Registration No. 10-1573436 "An engine mount device using a magnetic fluid elastic body" (registered on November 25, 2015) is a variety of frequency bands by changing the stiffness of a magnetic fluid elastic plate made of a magnetic fluid elastic body by a magnetic field generator. Although it is possible to attenuate the vibration of the engine, there is a problem that very high power is required to change the stiffness of the magnetic fluid elastic plate.

Republic of Korea Patent Registration No. 10-1573436 "Engine mounting device using magnetic fluid elastomer" (registered on November 25, 2015) Korean Patent Registration No. 10-1288995 "Switching engine mount device" (registered on July 17, 2013) Korean Patent Registration No. 10-1288997 "Switching engine mount device" (registered on July 17, 2013) Republic of Korea Patent Registration No. 10-1573436 "Engine mounting device using magnetic fluid elastomer" (registered on November 25, 2015)

The present invention was conceived to solve the problems of the prior art as described above, and the engine vibration is attenuated or the decoupler body is in close contact with the decoupler seating surface of the core upper plate by magnetic force coupling. It is intended to propose an engine mount device capable of absorbing engine vibration by being spaced apart from the upper plate of the core.

In order to solve the above problems, the present invention comprises an orifice body and an orifice upper plate, and communicates with each other through an orifice passage an upper liquid chamber whose volume is variable by a main rubber and a lower liquid chamber whose volume is variable by a diaphragm. An orifice module is provided with a central through-hole open up and down in the center of the orifice module to separate and divide the orifice module to separate the upper liquid chamber and the lower liquid chamber, and the upper surface of the upper liquid chamber An engine mount device in which a decoupler in contact with a fluid and a lower surface thereof in contact with the fluid in the lower liquid chamber is provided, wherein the orifice body includes a bottom plate in the form of a ring having a first central hole, and a cylinder extending upward from the bottom plate. The middle side wall in the form of a cylindrical shape extending upward from the inner edge of the bottom plate, and an inner wall forming a coil receiving portion together with the middle side wall, and the middle as a cylindrical shape extending upward from the outer edge of the bottom plate It comprises an outer wall forming an orifice passage with the side wall; A magnetic field forming coil is mounted on the coil receiving portion; A magnetic core comprising a cylindrical core body extending in the vertical direction and inserted into the central through hole of the orifice body, and a core upper plate extending radially from the upper end of the core body and forming a decoupler seating surface on the upper surface. Is provided; The decoupler is provided on an upper portion of the core upper plate and comprises a decoupler body made of a magnetic fluid elastic body; The orifice upper plate includes a ring-shaped first upper plate covering an open upper surface of the orifice passage while an outer edge thereof is coupled to an outer wall of the orifice body, and a vertical extension part extending upward from an inner edge of the first upper plate, And a second upper plate in the form of a ring extending inward from the upper portion of the upper and lower extension portions and supporting the edge of the decoupler from the upper portion; By controlling the current supply to the coil for forming the magnetic field, the decoupler body is in close contact with the decoupler seating surface of the core upper plate by magnetic coupling, so that engine vibration is attenuated or the decoupler body is spaced apart from the core upper plate to cause engine vibration. Capable of absorbing; It features.

In the above: A ring-shaped permanent magnet seating plate having a second central hole formed in the center is provided on an upper portion of the magnetic field forming coil mounted on the coil receiving unit; A ring-shaped permanent magnet having a third central hole formed on an upper portion of the permanent magnet mounting plate; The core body of the magnetic core is disposed in a form that is inserted into the third central hole of the permanent magnet and the second central hole of the permanent magnet seat plate; The core upper plate of the magnetic core includes a core outer upper plate extending radially outward from the upper end of the core body to cover the upper surface of the permanent magnet, and a ring-shaped core inner extending radially inward from the upper end of the core body. Consisting of a top plate; This is desirable.

In the above, the decoupler may further include a metal decoupler plate built in the decoupler body and capable of magnetic coupling.

In the above, the decoupler may further include an edge supporting metal ring provided at an edge of the decoupler body.

In the above, it is preferable that the decoupler further comprises a decoupler plate made of a metal material that is built into the decoupler body and is magnetically coupled, and a metal ring for supporting an edge provided at an edge of the decoupler body. .

As described above, according to the present invention, the decoupler body made of a magnetic fluid elastic body is in close contact with the decoupler seating surface of the core upper plate by magnetic coupling, so that engine vibration is attenuated or the decoupler body is spaced apart from the core upper plate to absorb engine vibration. Provides an engine mount device that can be used.

1 is a cross-sectional view of an engine mounting device according to an embodiment of the present invention,
2 is an exploded cross-sectional view of the main part of FIG.
Figure 3 is an exploded perspective view of Figure 2,
Figure 4 is a cross-sectional view of the engine mounting device of Figure 1 in a state in which the decoupler body is in close contact with the core upper plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

1 is a cross-sectional view of an engine mounting apparatus according to an embodiment of the present invention, FIG. 2 is an exploded cross-sectional view of a main part of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 2, and FIG. 4 is a core top plate It is a cross-sectional view of the engine mount device of FIG. 1 in a state in close contact with it.

In the engine mounting device according to an embodiment of the present invention, as shown in FIG. 1, fluid is contained in an inner space formed by combining the main rubber 200 and the diaphragm 300 respectively above and below the hollow main frame 100. It is configured to be enclosed, and the orifice module 400 is mounted in this inner space to separate the upper liquid chamber U and the lower liquid chamber L to communicate with each other.

In addition, the connection core 201 is inserted and coupled to the main rubber 200 in the same manner as vulcanization bonding so that it can be coupled to the engine.

That is, the volume of the upper liquid chamber (U) can be varied by the main rubber 200 and corresponds to a region where vibration is input from the engine, and the volume of the lower liquid chamber (L) is variable by the diaphragm 300 Can be.

The orifice module 400 allows the upper liquid chamber (U) and the lower liquid chamber (L) to communicate with each other through the orifice passage 413, and the orifice module 400 separates the upper liquid chamber (U) and the lower liquid chamber (L). And partitioning.

According to this structure, when vibration occurs from the engine, the main rubber 200 is deformed through the connection core 201 coupled to the engine, and the fluid pressure in the upper liquid chamber U changes, and according to this pressure change The fluid sealed in the upper liquid chamber U flows to the lower liquid chamber L through the orifice passage 413, and engine vibration is attenuated by the inertial resistance of the fluid generated at this time.

Meanwhile, since the technical feature of the present invention is meaningful in that the decoupler is in close contact with or spaced apart from the core upper plate, it is possible to respond to more various types of vibrations, so a separate description of the orifice passage of the orifice module will be omitted. However, depending on the embodiment, a plurality of orifice passages may be provided so as to cope with more various vibrations. In spite of the deformation of the orifice passage, if the decoupler, which is a technical feature of the present invention, is in close contact with or separated from the core upper plate, it is within the scope of the present invention.

The configuration of the upper liquid chamber (U), the lower liquid chamber (L), the orifice module 400, the main rubber 200, and the diaphragm 300 is a very common technology for a fluid-enclosed engine mount, so a detailed description thereof will be omitted. In addition, the drawings shown in this embodiment should be understood as an example, and the upper liquid chamber (U), the lower liquid chamber (L), the orifice module 400, the orifice passage 413 formed in the orifice module 400, The structure of the main rubber 200 and the diaphragm 300 can be changed in a wide variety.

Hereinafter, characteristic elements of the present embodiment will be described.

First, the orifice module 400 will be described.

The orifice module 400 of this embodiment includes an orifice body 410 and an orifice top plate 420.

The orifice body 410 has a central through hole 411 open up and down in the center, and a coil receiving portion 412 with an open top surface is formed at an inner edge adjacent to the center through hole 411, and an outer edge An orifice passage 413 with an open top surface is formed.

To this end, the orifice body 410 includes a ring-shaped bottom plate 410a having a first central hole formed therein, a cylindrical intermediate side wall 410d extending upward from the bottom plate 410a, and a bottom plate 410a. As a cylindrical shape extending upward from the inner edge of the inner wall 410c forming the coil receiving portion 412 together with the intermediate side wall 410d, and a cylindrical shape extending upward from the outer edge of the bottom plate 410a. It comprises an outer wall 410b forming an orifice passage 413 together with the intermediate side wall 410d.

Meanwhile, an orifice passage 413 is formed between the outer wall 410b and the intermediate side wall 410d, while an orifice passage blocking wall 410e is also formed.

In addition, a through hole (not shown) for a lower liquid chamber is formed in the bottom plate 410a to allow the orifice passage 413 and the lower liquid chamber L to communicate with each other.

The coil 500 for forming a magnetic field is accommodated in the coil receiving portion 412 of the orifice body 410.

The magnetic field forming coil 500 is provided to apply a magnetic force to a decoupler 800 to be described later.

The magnetic field forming coil 500 is disposed in a form wound around the inner wall 410c of the orifice body 410.

Therefore, when a current flows through the coil 500 for forming a magnetic field wound with a certain number of turns, a magnetic force is generated, and the generated magnetic force is transmitted along the magnetic core 700 to magnetically couple with the decoupler body 810 to be described later. do.

In addition, the arrangement of the N pole and the S pole may be reversed according to the direction of the current flowing through the magnetic field forming coil 500.

A permanent magnet mounting plate 610 on which a permanent magnet 620 is mounted is provided on an upper portion of the magnetic field forming coil 500.

The permanent magnet seat plate 610 has a ring shape in which a second central hole is formed and is provided on the upper part of the coil 500 for forming a magnetic field to cover the coil receiving part 412.

A ring-shaped permanent magnet 620 in which a third central hole is formed is mounted on the upper surface of the permanent magnet mounting plate 610.

The permanent magnet 620 is for continuously applying a magnetic force to the decoupler 800, and a change in polarity does not occur.

A magnetic core 700 is provided on the permanent magnet 620.

The magnetic core 700 includes a core body 710 and a core upper plate 720.

The core body 710 extends in the vertical direction and is inserted into the third central hole of the permanent magnet 620, the second central hole of the permanent magnet mounting plate 610, and the central through hole 411 of the orifice body 410 It is a cylindrical shape.

The core upper plate 720 extends radially from the upper end of the core body 710 and a decoupler seating surface 721 is formed on the upper surface thereof. The decoupler seating surface 721 is a boo to which the decoupler body 810, which will be described later, is in close contact.

The core upper plate 720 is again composed of a core outer upper plate 722 and a core inner upper plate 723.

The core outer upper plate 720 is a portion extending radially outward from the upper end of the core body 710 to cover the upper surface of the permanent magnet 620.

The core inner upper plate 730 has a ring shape extending radially inward from the upper end of the core body 710.

The decoupler seating surface 721 has a structure corresponding to the shape of the decoupler body 810, and the decoupler body 810 is pulled toward the core upper plate 720 by magnetic force coupling. When in close contact with the seating surface 721, engine vibration is attenuated.

The shape of the magnetic core 700 is designed to effectively apply a magnetic field to the decoupler body 810 to be described later, and to allow the decoupler body 810 to be easily seated.

A decoupler 800 is provided on the magnetic core 700.

The decoupler 800 includes a decoupler body 810 made of a magnetic fluid elastic body, a decoupler plate 820 made of a metal material embedded in the decoupler body 810, and an edge of the decoupler body 810. It comprises a metal ring 830 for supporting the edge that is provided.

In general, magneto-fluid elastomers (MR Elastomer, MRE, or magnetorheological elastomers) contain magnetic particles (usually iron powder) that can be polarized in a chain form inside a polymer material such as a silicone material or natural rubber, and are formed by a magnetic field. It is a material whose properties (especially stiffness) change.

The present invention does not take into account the stiffness change according to the magnetic field of the magneto-fluid elastic body, but in mind that the magnetic particles of the magneto-fluid elastic body exert attractive force by magnetic force coupling.

That is, the decoupler body 810 may be in close contact with the core upper plate 720 of the magnetic core 700 according to the magnetic force of the permanent magnet 620 and the magnetic force formed in the magnetic core 700 by the coil 500 for forming a magnetic field. In addition, the engine vibration may be attenuated when it is closely contacted in this way.

On the other hand, when the decoupler body 810 is spaced apart from the core upper plate 720 of the magnetic core 700, it may absorb engine vibration.

On the other hand, the decoupler plate 820 made of a metal material embedded in the decoupler body 810 is more powerful against the magnetic force formed in the magnetic core 700 by the magnetic force of the permanent magnet 620 and the coil 500 for forming a magnetic field. It is designed to be magnetically coupled.

Therefore, it is preferable that the decoupler plate 820 is made of a ferromagnetic material.

The edge support metal ring 830 is provided to be firmly coupled to the orifice top plate 420.

Such a decoupler 800 has its lower surface in contact with the fluid in the lower liquid chamber L.

An orifice top plate 420 is fixedly provided on an upper portion of the orifice body 410 and an upper portion of the decoupler 800.

The orifice upper plate 420 has a structure including a first upper plate 421 in a ring shape, a vertical extension part 422 in a cylindrical shape, and a second upper plate 423 in a ring shape.

The first upper plate 421 has a ring shape that covers the open upper surface of the orifice passage 413 while the outer edge is coupled to the outer wall 410b of the orifice body 410.

The first upper plate 421 has an orifice passage 413 and a through hole 421a for an upper liquid chamber to communicate with each other. That is, the fluid in the upper liquid chamber U flows into the orifice passage 413 through the through hole for the upper liquid chamber 421a, and the lower liquid chamber L through the through hole for the lower liquid chamber (not shown) formed in the bottom plate 410a. Will flow.

The vertical extension part 422 has a cylindrical shape extending upward from the inner edge of the first upper plate 421.

The second upper plate 423 has a ring shape that extends inward from the upper portion of the upper and lower extension portions 422 and supports the edge of the decoupler 800 from the upper portion.

A central opening 423a is formed in the center of the second upper plate 423. Accordingly, the fluid in the upper liquid chamber U contacts the upper surface of the decoupler 800.

Meanwhile, the diaphragm 300 is provided with a diaphragm fixing ring 301 made of a metal material.

Accordingly, the diaphragm 300 and the orifice module 400 are fixed by the main frame 100.

This embodiment as described above operates as follows.

In this embodiment, the decoupler body 810 is basically spaced apart from the decoupler seating surface 721 of the core upper plate 720 so that the decoupler body 810 can absorb the pressure change of the fluid in the upper liquid chamber U. have.

That is, the decoupler body 810 mainly vibrates when high-frequency micro-displacement vibration is input to the engine mount, thereby absorbing the pressure change of the fluid in the upper liquid chamber U.

At this time, the decoupler body 810 uses the rubber properties of the magnetic fluid elastomer so as to absorb high-frequency vibrations due to micro-displacement.

If the permanent magnet 620 has an N pole formed on the side toward the decoupler 800, the direction of the current flowing through the magnetic field forming coil 500 is on the side toward the decoupler 800 of the magnetic core 700. When the S pole is formed so that the magnetic forces are canceled from each other, or the current does not flow through the magnetic field forming coil 500, the decoupler body 810 may not be in close contact with the magnetic core 700.

On the other hand, when the decoupler body 810 is in close contact with the core upper plate 720, relatively high dynamic stiffness can be obtained compared to the case where vibration of the decoupler body 810 is allowed.

When the decoupler body 810 is pulled toward the magnetic core 700 while receiving attractive force by magnetic coupling according to the direction and strength of the current flowing through the magnetic field forming coil 500 and the magnetic force of the permanent magnet 620, the decoupler is decoupled. Engine vibration may be attenuated as the body 810 is in close contact with the decoupler seating surface 721 of the core upper plate 720.

For example, if the N pole is formed on the side of the permanent magnet 620 toward the decoupler 800, the direction of the current flowing through the magnetic field forming coil 500 is on the side toward the decoupler 800 of the magnetic core 700. If the N-pole is formed, it is possible to exert an attractive force to the decoupler body 800 more strongly.

In this way, the close contact of the decoupler body 810 to the core upper plate 720 is that the magnetic particles (usually iron powder) of the magneto-fluid elastic body exert attractive force by magnetic coupling, and the flexible rubber properties of the magneto-fluid elastic body are used together. will be.

In this way, appropriate active vibration attenuation is possible according to the close contact/separation of the decoupler body 810 to the core upper plate 720, and for this purpose, the strength and direction of the current applied to the magnetic field forming coil 500 is determined by the engine vibration. It is desirable to change according to the frequency state of.

That is, the intensity and direction of the current applied to the magnetic field forming coil 530 may be controlled according to a signal received from the ECU of the vehicle.

As described above, in the engine mount device according to an embodiment of the present invention, the decoupler body is in close contact with the decoupler seating surface of the core upper plate by magnetic coupling, or the decoupler body is separated from the core upper plate to actively prevent engine vibration in various frequency ranges. Can be attenuated by

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: mainframe
200: main rubber U: upper liquid chamber
300: diaphragm L: lower liquid chamber
400: orifice module
410: orifice body 411: center through hole
412: coil receiving part 413: orifice passage
420: orifice top plate
500: coil for magnetic field formation
610: permanent magnet mounting plate 600: permanent magnet
700: magnetic core
710: core body
720: core upper plate 721: decoupler seating surface
722: core outer upper plate 723: core inner upper plate
800: decoupler
810: decoupler body 820: decoupler plate
830: metal ring for edge support

Claims (4)

The upper liquid chamber, which is composed of the orifice body and the orifice upper plate, whose volume is changed by the main rubber and the lower liquid chamber whose volume is changed by the diaphragm, is separated and partitioned in communication with each other by the orifice passage, and is opened up and down in the center. An orifice module having a central through hole is provided, and is mounted on an upper portion of the central through hole of the orifice module to separate the upper liquid chamber and the lower liquid chamber, and the upper surface is in contact with the fluid of the upper liquid chamber, and the lower surface is in contact with the fluid of the lower liquid chamber. In the engine mount device provided with a contact decoupler:
The orifice body includes a ring-shaped bottom plate having a first central hole formed thereon, a cylindrical middle side wall extending upward from the bottom plate, and a cylindrical middle side wall extending upward from an inner edge of the bottom plate. And an inner wall forming a coil receiving portion together with, and an outer wall forming an orifice passage with the intermediate side wall in a cylindrical shape extending upward from an outer edge of the bottom plate;
A magnetic field forming coil is mounted on the coil receiving portion;
A magnetic core comprising a cylindrical core body extending in the vertical direction and inserted into the central through hole of the orifice body, and a core upper plate extending radially from the upper end of the core body and forming a decoupler seating surface on the upper surface Is provided;
The decoupler is provided on an upper portion of the core upper plate and comprises a decoupler body made of a magnetic fluid elastic body;
The orifice upper plate includes a ring-shaped first upper plate covering an open upper surface of the orifice passage while an outer edge is coupled to an outer wall of the orifice body, and a vertical extension part extending upward from an inner edge of the first upper plate, And a second upper plate in the form of a ring extending inward from the upper portion of the upper and lower extension portions and supporting the edge of the decoupler from the upper portion;
By controlling the supply of current to the magnetic field forming coil, the decoupler body is in close contact with the decoupler seating surface of the core upper plate by magnetic coupling, so that engine vibration is attenuated or the decoupler body is spaced apart from the core upper plate to cause engine vibration. Capable of absorbing;
Engine mount device, characterized in that.
The method of claim 1:
A ring-shaped permanent magnet seating plate having a second central hole formed in the center on the upper portion of the magnetic field forming coil mounted on the coil accommodating portion; A ring-shaped permanent magnet having a third central hole formed on the upper portion of the permanent magnet mounting plate is mounted; The core body of the magnetic core is disposed in a form that is inserted into the third central hole of the permanent magnet and the second central hole of the permanent magnet seat plate; The core upper plate of the magnetic core includes a core outer upper plate extending radially outward from the upper end of the core body to cover the upper surface of the permanent magnet, and a ring-shaped core inner extending radially inward from the upper end of the core body. Consisting of a top plate; Engine mount device, characterized in that.
The method according to claim 1 or 2,
The decoupler is embedded in the decoupler body and further comprises a decoupler plate made of a metal material capable of magnetic coupling.
The method of claim 3,
The decoupler further comprises an edge supporting metal ring provided at an edge of the decoupler body.

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