KR102441394B1 - Mounting structure with elastic part on bracket - Google Patents

Abstract

A mount structure according to an embodiment of the present invention includes: a housing having a first surface portion and a second surface portion facing the first surface portion; a core provided inside the housing and provided in a space between the first and second surface portions; a rubber provided on the outer peripheral surface of the core and having a support part selectively contacting the inner surface of the housing, a fastening part fixed to the inner surface of the housing, and a bridge part connecting the support part and the fastening part; a bracket having a fixing part to which the core is fastened and a bent part extending from the fixing part and spaced apart from the outer surface of the housing; and an elastic part protruding from the support part toward the outer surface of the housing. And, according to the movement of the core, the contact between the first surface portion and the elastic portion and the contact between the second surface portion and the support portion are made step by step.
The present invention having the above configuration can be adjusted so that the stiffness value of the mount according to the increased or decreased displacement is increased or decreased gently.
In addition, there is an advantage in that it is possible to suppress a large instantaneous vibration such as a jerk phenomenon and a surge phenomenon occurring in the forward direction and the backward direction.

Description

Mounting structure in which an elastic part is provided in the bracket {Mounting structure with elastic part on bracket}

The present invention relates to a mount structure, and in more detail, to a mount structure capable of gently increasing or decreasing rigidity.

In general, as the length of the mount increases, the rotation radius of the mount increases, and thus the displacement amount of the mount increases. In addition, if the number of mounts is reduced in order to reduce the weight of the vehicle, the load to be shared for each mount is increased, and thus the displacement amount of the mount is increased. In addition, when a high-torque engine is mounted, the PT roll angle increases and the displacement amount of the mount increases.

1 is a view showing a mount according to the prior art. 1, a mount 1 according to the prior art is a housing 2 connected to a vehicle body (not shown) of a moving means, disposed inside the housing 2, and mounted on an engine (not shown) of the moving means. It includes a core 3 to be connected, and a rubber 4 disposed in a space between the housing 2 and the core 3 .

The mount (1) restricts the relative motion of the housing (2) and the core (3) so that vibration generated from the engine connected to the core (3) is transmitted to the vehicle body connected to the housing (2). prevent.

The core 3 may be fastened to a bracket (not shown) provided with a fastening hole 3a, and the bracket may be connected to the engine. The rubber 4 is formed on the outer circumferential surface of the core 3 and includes a support portion 4a that presses the inner surface of the housing 2 moved by a predetermined distance or more, a fastening portion 4b fixed to the inner surface of the housing, and the and a bridge part 4c connecting the support part 4a and the fastening part 4b to suppress the movement of the core 3 .

According to the mount 1 according to the prior art, when the core 3 moves less than a predetermined distance, the bridge part 4c maintains the distance between the support part 4a and the fastening part 4b, and the core ( 3) suppresses the movement (first step), and when the core 30 moves more than a predetermined distance, the bridge portion 4c suppresses the movement of the core 3 as well as the support portion 4a presses the inner surface of the housing 2 to suppress the movement of the core 3 (second step).

As such, since the mount 1 according to the prior art suppresses the movement of the core 30 in two steps, there is a problem of abruptly changing the stiffness value based on a specific point (predetermined distance), and thus vibration This can happen.

On the other hand, such vibrations may be more severe during acceleration or shifting due to abrupt manipulation of the vehicle. For example, a jerk phenomenon such as tip-in/tip-out may occur according to manipulation of the accelerator pedal. Also, vibration may occur due to a surge phenomenon in which abnormal engine RPM fluctuations occur regularly even if there is no abrupt manipulation.

Vibration as described above is transmitted to the user through the vehicle body to reduce riding comfort, or vibration is transmitted to the steering device through the vehicle body, thereby reducing drivability.

In order to prevent such vibration, a method of adjusting the stiffness ratio between the engine mount and the TM mount has been proposed. For example, the engine mount is designed to have the same rigidity when moving forward and backward, and the TM mount can be designed so that the strength during the forward movement is twice as high as the strength during the rearward movement. However, even by such prior art, it is not possible to effectively reduce the jerk and surge vibration in the tip in/out condition.

On the other hand, a method for reducing vibration and shock by applying a strong and soft pedal filter has been proposed. Although the strong pedal filter can reduce the shock, it may seriously deteriorate the acceleration performance of the vehicle, and Since the pedal filter is insufficient to reduce the impact, it is difficult to design the pedal filter so that the acceleration performance is not deteriorated while reducing the impact. In addition, there was a problem in that the sense of direct connection was reduced by the addition of the filter, and fuel efficiency loss occurred.

An object of the present invention is to provide a mount structure in which a stiffness value is gently increased or decreased so as to solve the above-described problems.

Another object of the present invention is to provide a mount structure that suppresses vibration in the forward and backward directions of a moving means generated by a jerk phenomenon or a surge phenomenon.

A mount structure according to the present invention for achieving the above object includes a housing having a first surface portion and a second surface portion facing the first surface portion; a core provided inside the housing and provided in a space between the first and second surface portions; a rubber provided on the outer peripheral surface of the core and having a support part selectively contacting the inner surface of the housing, a fastening part provided on the inner surface of the housing, and a bridge part connecting the support part and the fastening part; a bracket having a fixing part to which the core is fastened and a bent part extending from the fixing part and spaced apart from an outer surface of the first or second surface part; and an elastic part protruding from the support part toward an outer surface of the first surface part or the second surface part; Including, according to the displacement of the core, the contact of the first surface portion and the elastic portion and the contact of the second surface portion and the support portion are made step by step.

In addition, as the displacement of the core increases, the first surface part and the elastic part are in contact with the second surface part and the support part is in contact before the mounting structure.

In addition, when the core is in a balanced state, the first surface portion and the elastic portion may be spaced apart by a first distance, the second surface portion and the support portion may be spaced apart by a second distance, and the first distance may be shorter than the second distance .

In addition, the first surface portion may include one surface of the housing facing the forward direction of the moving means, and the second surface portion may include one surface of the housing facing the backward direction of the moving means.

In addition, the bent part includes a first bent part extending from the fixing part and spaced apart from the first surface part and a second bending part extending from the fixing part and spaced apart from the second surface part, and the elastic part is the first bent part. and a first elastic part protruding from the part in the backward direction and a second elastic part protruding from the second bent part in the forward direction.

In addition, when the core is moved in the forward direction, the first surface portion and the support portion come into contact after the second surface portion and the second elastic portion come into contact, and when the core is moved in the backward direction, the first surface portion and After the first elastic part contacts, the second surface part may contact the support part.

In addition, the housing includes a first housing and a second housing disposed in a direction deviated from the forward direction or the backward direction from the first housing, and the fixing part moves forward through the space between the first housing and the second housing. It may extend in a direction and a backward direction.

In addition, the bent portion extends from both ends of the fixing portion and is disposed to be spaced apart from the outer surfaces of the first housing and the second housing, and the elastic portion includes a first elastic portion protruding from the bent portion toward the first housing and the It may include a second elastic part protruding toward the second housing from the support part.

In addition, when the core is in a balanced state, the first housing and the first elastic part are spaced apart by a third distance, the second housing and the second elastic part are spaced apart by a fourth distance, and the third distance and the fourth distance are spaced apart from each other by a fourth distance. They may have different lengths.

In addition, as the displacement of the core increases, the mount structure has a first rigidity, a second rigidity, and a third rigidity sequentially, the first rigidity is determined by the rigidity of the bridge part, and the second rigidity is The rigidity of the bridge part and the elastic part may be determined, and the third rigidity may be determined by the rigidity of the bridge part, the elastic part, and the support part.

In addition, the first stiffness, the second stiffness, and the third stiffness may have stiffness values that increase in order.

The present invention having the configuration as described above can be adjusted so that the stiffness value of the mount according to the increased or decreased displacement is increased or decreased gently.

In addition, there is an advantage that can suppress vibrations generated in the forward direction and the backward direction.

In addition, it is possible to prevent vibration from being transmitted through the vehicle body, thereby improving the vehicle body feeling, and preventing the steering device from being affected by the vibration.

In addition, the three-point mount system should be provided with the same robustness as the four-point or higher mount system.

In addition, by distributing the load to each mount, it is possible to achieve low rigidity of the same torque transmission system, and by reducing the PT displacement, it is possible to improve riding comfort and unity of movement.

1 is a view showing a mount according to the prior art.
2 is a perspective view of a mount according to a first embodiment of the present invention;
3 is a top view of a mount according to a first embodiment of the present invention;
4 is a front view of a mount according to a first embodiment of the present invention;
5 is a rear view of a mount according to a first embodiment of the present invention;
6 is a view showing a change in the structure of the mount as the movement amount of the core increases.
7 is a view showing an increase in the load applied to the mount as the moving amount of the core increases.
8 is a view showing the increase or decrease of the load applied to the mount according to the increase or decrease of the movement amount of the core.
9 is a perspective view of a mount according to a second embodiment of the present invention;
10 is a top view of a mount according to a second embodiment of the present invention;
11 is a front view of a mount according to a second embodiment of the present invention;
12 is a side view of a mount according to a second embodiment of the present invention;

Hereinafter, a mount structure in which an elastic part is provided on a bracket according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a perspective view of the mount according to the first embodiment of the present invention, Figure 3 is a top view of the mount according to the first embodiment of the present invention, Figure 4 is a front view of the mount according to the first embodiment of the present invention and Figure 5 is a rear view of the mount according to the first embodiment of the present invention.

2 to 5 , the mount 10 according to the first embodiment of the present invention includes a housing 20 connected to a vehicle body (frame) of a moving means, and provided inside the housing 20, The core 30 connected to the engine (drive unit) of the moving means, and a rubber provided in the space between the core 30 and the housing 20 to suppress the relative motion between the housing 20 and the core 30 . (40), a bracket (50) to which the core is fixed, and an elastic part (60) provided on one side of the bracket (50) to suppress the relative motion between the housing (20) and the core (30).

The housing 20 includes a first surface portion 21 and a second surface portion 22 disposed to face the first surface portion 21 . As shown in FIG. 4 , the first face part 21 and the second face part 22 may be understood to include both sides of the housing.

However, as shown in FIG. 2 , the first surface portion 21 may be understood to include a surface disposed in the forward direction of the housing, and the second surface portion 22 is located in the backward direction of the housing. It may be understood to include a surface on which it is disposed.

Meanwhile, in order to avoid confusion between the illustrated direction in the drawing and the forward and backward directions of the moving means, the forward and backward directions of the moving means are defined as the running directions of the moving means, and both directions of the moving means are perpendicular to the running direction. defined as one direction. Accordingly, the front and rear directions in the drawing may be understood as both directions of the moving means, and the left and right directions in the drawing may be understood as forward/reverse directions of the moving means.

The core 30 is disposed inside the housing 20 . The core 30 may be disposed in the center of the housing 20 through any one of the open surfaces of the housing 20 . The core 30 may be connected to the engine of the moving means through the fastening groove 31 , and may be moved a certain distance according to the vibration of the engine.

Meanwhile, in the present invention, the relative motion of the core 30 and the housing 20 may mean the movement of the core 30 with respect to the housing 20 , and the relative motion of the core 30 with respect to the core 30 . It may mean the movement of the housing 20 to However, for convenience of description and understanding, the relative motion of the core 30 and the housing 20 is briefly described as the movement of the core 30 , and the relative momentum of the core 30 and the housing 20 . is to be described as the movement amount (displacement amount) of the core.

The rubber 40 is provided in a space between the housing 20 and the core 30 , and may be disposed in contact with the outer surface of the core 30 to surround the core 30 .

The rubber 40 is fastened in contact with the inner surface of the support part 41 contacting the first surface part 21 or the second surface part 22 according to the movement of the core 30 and the inner surface of the housing 20 . It includes a part 42 and a bridge part 43 connecting the support part 41 and the fastening part 42 .

The support part 41 may include a contact surface that makes surface contact with the first surface part 21 or the second surface part 22 . The contact surface may be disposed to face the first surface portion 21 and the second surface portion 22 . For example, as shown in the drawings, it may be formed to face forward and backward of the moving means.

The support portion 41 is spaced apart from any one of the first surface portion 21 and the second surface portion 22 by a second distance d2 , and the core 30 is disposed between the first surface portion 21 and the second surface portion 22 . When the second distance d2 is moved toward any one of (22), the support part 41 comes into contact with any one of the first face part 21 and the second face part 22, and the core 30 ) to inhibit the movement of (See Fig. 6)

The support part 41 may be formed of an elastic body including rubber, and when the core 30 is moved more than the second distance d2, the support part 41 is compressed and the core 30 is held by elastic force. Pressurize to inhibit movement.

The fastening part 42 is fixed to the inner surface of the housing. The fastening part 42 may be disposed to contact the lower surface of the housing 20 as illustrated in FIG. 4 , but is not limited thereto, and may be disposed to contact the upper surface, the upper surface, and the lower surface of the housing 20 . .

Since the bridge part 43 connects the support part 41 in contact with the core 30 and the fastening part 42 in contact with the housing 20 , the relative motion between the core 30 and the housing 20 is suppressed. do. Unlike the support part 41 , the bridge part 43 may suppress the movement of the core 30 irrespective of the movement distance of the core 30 .

The bridge part 43 may be formed of an elastic body including rubber, and is deformed by the movement of the core 30 , and suppresses the movement of the core 30 by restoring force. Meanwhile, the support part 41 , the fastening part 42 , and the bridge part 43 may be integrally formed and may be made of a single elastic body.

The bracket 50 is disposed to face the outer surface of the housing 20 from a fixing part 51 to which the core 30 is fastened, and a fixing part 51 extending toward the outside of the housing 20 , from the fixing part 51 . It includes a bent portion 52 to be.

The fixing part 51 may extend in the traveling direction of the moving means, and the bent part 52 may extend from one end of the fixing part 52 in a direction perpendicular to the traveling direction. For example, as shown in FIG. 2 , the bent part 52 may extend from both ends of the fixing part 52 toward the front of the drawing. For example, the bent part may include a first bent part extending from one end of the fixing part and spaced apart from the first surface part, and a second bending part extending from the other end of the fixing part and spaced apart from the second surface part.

The bent portion 52 may include a surface disposed toward the first surface portion 21 and the second surface portion 22 , and spaced apart from the first surface portion 21 and the second surface portion 22 by a predetermined distance. can be placed so

The elastic part 60 is formed on one side of the bent part 51 . In more detail, the elastic part 60 may be disposed on a surface facing the first surface part 21 or the second surface part 22 from the bent part 51 , and the elastic part 60 is the bent part 51 . It may be formed to protrude a predetermined distance from the part 51 toward the first surface part 21 or the second surface part 22 . For example, the elastic part 60 may include a first elastic part protruding from the first bent part in the backward direction and a second elastic part protruding from the second bent part in the forward direction.

Meanwhile, the end of the elastic part 60 may be spaced apart from the first surface part 21 or the second surface part 22 by a first distance d1 . When the core 30 moves a first distance d1, the elastic part 60 comes into contact with the first face part 21 or the second face part 22, and the core 30 moves a first distance ( d1) When it moves or more, the elastic part 60 is compressed and presses the first surface part 11 or the second surface part 22 . In this case, the first distance d1 may be shorter than the second distance d2. A detailed description thereof will be given later.

6 is a view showing the structure of the mount as the moving amount of the core increases, and FIG. 7 is a view showing the increase in the load applied to the mount as the moving amount of the core increases. 8 is a view showing the increase or decrease of the load applied to the mount as the movement amount of the core increases or decreases.

Figure 6 (a) is a view showing the structure of the mount when the relative motion of the core 30 and the housing 20 does not occur, that is, when the core 30 is in a balanced state, Fig. 6 (b) is a view showing the structure of the mount in which the core 30 and the bracket 50 are moved in the reverse direction by the first distance d1, and FIG. 6 (c) is the core 30 and the bracket 50 by the second distance (d2) It is a view showing the structure of the mount moved in the reverse direction.

6 to 8, when the relative motion between the core 30 and the housing 20 does not occur, that is, when the core 30 is in a balanced state, as shown in FIG. 6(a), the elastic part ( 60) is disposed to be spaced apart from the outer surface of the first face part 21 by a first distance d1, and the support part 41 is disposed to be spaced apart from the inner surface of the second face part 22 by a second distance d2 .

When the core 30 moves less than the first distance d1 according to the vibration of the engine (section 1 of FIG. 7 ), the vibration is suppressed by the restoring force of the bridge part 43 . In this case, the rigidity of the mount may be defined as 'first rigidity', and the first rigidity may be determined by the rigidity of the bridge part 43 .

On the other hand, as the vibration of the engine increases, when the core 30 moves more than the first distance d1 and less than the second distance d2 (see section 2 of FIG. 7 and FIG. 6 (b)), the elasticity The portion 60 is in contact with the first surface portion 21, and the elastic portion 60 presses the first surface portion 21 to suppress movement, provided that the support portion 41 and the second surface portion can maintain a state spaced apart by a certain distance. In this case, the rigidity of the mount may be defined as 'second rigidity', and the second rigidity may be determined by the rigidity of the bridge part 43 and the rigidity of the elastic part 60 .

On the other hand, as the vibration of the engine increases, when the core 30 is moved beyond the second distance d2 (see section 3 of FIG. 7 and FIG. 6 (c)), the support part 41 and the second The two surface portions 22 are in contact, and the support portion 41 presses the second surface portion 22 to suppress the movement of the core 30 . In this case, the rigidity of the mount may be defined as 'third rigidity', and the third rigidity includes all of the rigidity of the bridge part 43 , the rigidity of the elastic part 60 , and the rigidity of the support part 41 . can be determined by

In this way, the movement amount of the core 30, that is, the relative distance between the core 30 and the housing 20 can be divided into three sections (section 1, section 2, section 3), and for each section, the core ( 30) Since the number of components for suppressing the movement is different, the mount 10 of the present invention may have a rigidity of three stages that varies according to the amount of movement of the core 30 .

In such a configuration, a transition section (section 2) can be added to the conventional abrupt stiffness change (indicated by the dotted line (a) in FIG. 7), so that a gentle change in stiffness (indicated by the solid line (b) in FIG. 7) can be implemented. And since it is possible to provide a reaction force corresponding to the amount of displacement of the core, it is possible to prevent an impact sound due to a collision.

Meanwhile, FIG. 8 is a view showing a change in the load N when the core 30 moves in the forward direction and the backward direction and the displacement increases or decreases. It can be seen that the conventional abrupt change in stiffness (dashed line B in FIG. 8) is changed to a gradual change in stiffness (solid line A in FIG. 8). It can be seen that such a change in stiffness is equally represented not only when the displacement is increased but also when the displacement is decreased. Here, when the displacement is decreased, it means that the core 30 is moved in the opposite direction to the increasing direction.

9 is a perspective view of a mount according to a second embodiment of the present invention, FIG. 10 is a top view of a mount according to a second embodiment of the present invention, and FIG. 11 is a front view of the mount according to a second embodiment of the present invention. and FIG. 12 is a side view of a mount according to a second embodiment of the present invention.

9 to 12, a mount 100 according to a second embodiment of the present invention will be described. However, since the configuration except for the housing 120 , the bent part 150 and the elastic part 160 can be applied and applied mutatis mutandis from the first embodiment, a detailed description thereof will be omitted.

The mount 100 according to the present embodiment includes a housing 120 , wherein the housing 120 includes a first housing 121 and a second housing disposed in a direction deviated from the driving direction from the first housing 121 . (122). For example, the second housing 122 may be disposed in a direction perpendicular to the driving direction from the first housing 121 . That is, with reference to FIG. 9 , the first housing 121 may be provided on the left side of the forward direction, and the second housing 122 may be provided on the right side of the forward direction.

The first housing 121 and the second housing 122 may be configured to be coupled to each other, but is not limited thereto.

The mount 100 according to the present embodiment includes a bracket 150 , and the bracket 150 extends from the core 30 into a space between the first housing 121 and the second housing 122 . can The bracket 150 is connected to the outer surfaces of the first housing 121 and the second housing 122 from an intermediate fixing part 151 exposed to the outside of the housing 120 and one end of the intermediate fixing part 151 . It includes extended bent portions 152 spaced apart from each other by a predetermined distance.

The mount 100 according to the present embodiment includes an elastic part 160 , and the elastic part 160 extends from one surface of the extended bent part 152 to the first housing 121 or the second housing 122 . It may protrude a certain distance toward. In more detail, the elastic part 160 includes a first extended elastic part 161 that protrudes from the extended bent part 152 toward the first housing, and a first extended elastic part 161 that protrudes from the extended bent part 152 toward the second housing. A second extension elastic part 162 may be included.

The first extended elastic part 161 and the second extended elastic part 162 may be spaced apart from the outer surfaces of the first housing 121 and the second housing 122 by a predetermined distance. At this time, the first extended elastic part 161 may be spaced apart from the first housing 121 by a third distance d3 , and the second extended elastic part 162 is attached to the second housing 122 . The fourth distance d4 may be spaced apart. The third distance d3 and the fourth distance d4 may be the same distance, but are not limited thereto and may have different distances.

In this way, when the third distance d3 and the fourth distance d4 are set differently from each other, the rigidity change of the mount can be changed in four steps differently from the first embodiment, so that a more relaxed change in rigidity can be obtained. have.

On the other hand, in the present embodiment, the housing 120 is provided in plurality on both sides of the traveling direction, and the intermediate fixing part 151 is disposed between the plurality of housings 121 and 122, but the present invention is not limited thereto. , it can be understood that one housing 120 has through-holes penetrating forward and backward, and the intermediate fixing part 151 is disposed through the through-holes.

10 110 Mount 20 120 Housing
30 core 40 rubber
41 Support 42 Fastening
43 Bridge 50 150 Bracket
51 Fixed part 52 Bending part
60 elastic
d1 first distance d2 second distance
d3 3rd street d4 4th street

Claims (11)

a housing 20 having a first face 21 and a second face 22 facing the first face 21;
a core 30 provided inside the housing 20 and provided in a space between the first surface portion 21 and the second surface portion 22;
a support part 41 provided on the outer peripheral surface of the core 30 and selectively contacting the inner surface of the housing 20; and a fastening part 42 fixed to the inner surface of the housing 20 . a rubber 40 having a bridge part 43 connecting the support part 41 and the fastening part 42;
a bracket 50 having a fixing part 51 to which the core 30 is fastened and a bent part 52 extending from the fixing part 51 and spaced apart from the outer surface of the housing 20; and
an elastic part (60) protruding from the bent part (52) toward the outer surface of the housing (20); includes,
When the core 30 is moved to one side, after the first surface part 21 comes into contact with the elastic part 60 , the second surface part 22 comes into contact with the support part 41 , and
When the core 30 is moved to the other side, after the second surface portion 22 comes into contact with the elastic portion 60 , the first surface portion 21 comes into contact with the support portion 41 .
The method of claim 1,
As the displacement amount of the core (30) increases, the contact between the first surface portion (21) and the elastic portion (60) is made prior to the contact between the second surface portion (22) and the support portion (41).
3. The method of claim 2,
When the core 30 is in a balanced state, the first face part 21 and the elastic part 60 are spaced apart by a first distance, and the second face part 22 and the support part 41 are spaced apart by a second distance. and the first distance is shorter than the second distance.
The method of claim 1,
The first surface portion 21 includes one surface of the housing 20 facing the forward direction of the moving means, and the second surface 22 includes one surface of the housing 20 facing the backward direction of the moving means. Including mount structure.
5. The method of claim 4,
The bent portion 52 extends from one end of the fixing portion 51 to a first bent portion spaced apart from the first surface portion 21 and extends from the other end of the fixing portion 51 to the second surface portion 22 . ) and a second bent portion that is spaced apart,
The elastic part 60 includes a first elastic part protruding from the first bent part in the backward direction and a second elastic part protruding from the second bent part in the forward direction.
6. The method of claim 5,
When the core 30 is moved in the forward direction, the first surface portion 21 comes into contact with the support portion 41 after the second surface portion 22 comes into contact with the second elastic portion,
When the core (30) is moved in the backward direction, the second surface portion (22) contacts the support portion (41) after the first surface portion (21) comes into contact with the first elastic portion (41).
5. The method of claim 4,
The housing 20 includes a first housing 121 and a second housing 122 disposed in the forward direction or backward direction from the first housing 121,
and an intermediate fixing part (151) extending in the forward direction and the backward direction through between the first housing (121) and the second housing (122).
8. The method of claim 7,
It extends from both ends of the intermediate fixing part 151 and includes an extension bent part 152 disposed to be spaced apart from the outer surfaces of the first housing 121 and the second housing 122,
A first extension elastic part 161 protrudes from the extended bent part 152 toward the first housing 121 and a second extension protrudes from the extended bent part 152 toward the second housing 122 . Mount structure including an elastic part (162).
9. The method of claim 8,
When the core 30 is in a balanced state, the first housing 121 and the first extended elastic part 161 are spaced apart by a third distance, and the second housing 122 and the second extended elastic part ( 162) is a fourth distance spaced apart, the third distance and the fourth distance is a mount structure of different lengths.
The mount structure of any one of claims 1 to 8,
As the displacement of the core 30 increases, the mount structure has a first rigidity, a second rigidity, and a third rigidity sequentially,
The first rigidity is determined by the rigidity value of the bridge part 43 , the second rigidity is determined by the rigidity values of the bridge part 43 and the elastic part, and the third rigidity is determined by the bridge part 43 . ), a mount structure determined by the stiffness value of the elastic part and the support part 41 .
11. The method of claim 10,
The first rigidity, the second rigidity, and the third rigidity have a rigidity value sequentially increasing.

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