JP2023028882A - Upper mount for damper, and suspension device - Google Patents

Abstract

To attenuate road noises in a predetermined frequency range.SOLUTION: An upper bush 24 coupled to a vehicle body side, and a lower bush 25 coupled to an upper end of a rod 21 of a damper 11 are aligned in a vertical direction. The upper bush and the lower bush each comprise an inner cylinder 10a surrounding the upper end of the rod from radial outside, an outer cylinder 10b surrounding the inner cylinder from radial outside, and an elastic body 10c coupling the inner cylinder and the outer cylinder with each other. The inner cylinders of each of the upper bush and the lower bush are separated from each other in the vertical direction, a mass 26 is provided to be in contact with an outer peripheral surface formed by the outer cylinders of each of the upper bush and the lower bush, and a vibrating mechanism 31 is provided to vibrate the upper bush and the lower bush in the vertical direction via the mass.SELECTED DRAWING: Figure 1

Description

The present invention relates to a damper upper mount and a suspension system.

Conventionally, there has been known a suspension device in which an upper end of a damper rod is provided with an inner cylinder, an outer cylinder, a bush having an elastic body, and a spring-mass system dynamic damper.

Japanese Patent Application Laid-Open No. 2000-120769

However, in the conventional suspension system, although it is possible to attenuate road noise at a specific frequency by the inertial force of the mass of the dynamic damper, it is difficult to attenuate road noise over a predetermined frequency range above this frequency. There was a problem that

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a damper upper mount and a suspension device capable of attenuating road noise over a predetermined frequency range.

In order to solve the above problems and achieve such objects, the damper upper mount of the present invention comprises an upper bush connected to the vehicle body side and a lower bush connected to the upper end of the rod of the damper. are arranged in the vertical direction, and the upper bushing and the lower bushing are composed of an inner cylinder surrounding the upper end portion of the rod from the outside in the radial direction, an outer cylinder surrounding the inner cylinder from the outside in the radial direction, and the and an elastic body connecting the inner cylinder and the outer cylinder to each other, wherein the inner cylinders of the upper bushing and the lower bushing are vertically separated from each other, and the outer cylinders of the upper bushing and the lower bushing are separated from each other in the vertical direction. and a vibrating mechanism that vertically vibrates the upper bush and the lower bush via the mass.

A suspension device of the present invention includes a damper having a rod, an upper mount for the damper of the present invention, an upper base that connects a vehicle body side and the upper bush, and a top end of the rod that connects the lower bush. With a lower base.

According to the present invention, since the masses are provided in contact with the outer peripheral surfaces of the outer cylinders of the upper bushing and the lower bushing, respectively, the vibrations from the tire transmitted to the rod are transferred to the lower bushing, the mass, and the upper bushing. in this order to be transmitted to the vehicle body.
This allows the mass to be placed in the transmission path of the vibration from the rod through the lower bushing to the upper bushing, not only at a specific frequency due to the inertia of the mass, but also at a predetermined frequency range above this frequency. can attenuate road noise over
Furthermore, since a vibration mechanism is provided to vibrate the upper bush and the lower bush in the vertical direction via the mass, the upper bush and the lower bush can be vibrated, for example, in opposite phases with respect to the input vibration. It is possible to excite and attenuate even input vibrations with large acceleration, and not only over a specific frequency caused by the inertial force of the mass, but also over a wide frequency range including lower frequencies. Road noise can be attenuated.

The vibrating mechanism includes either one of a permanent magnet and a coil provided in the mass, a mover that encloses the mass from the outside in the radial direction and is provided to move up and down, and the mover. either one of the permanent magnet and the coil provided.

Since the vibrating mechanism includes a permanent magnet, a coil, and a mover, when a control current is supplied to the coil to vibrate the mover in the vertical direction, the upper bushing and the lower bushing move through the mass. In addition, it is possible to generate vibration in phase opposite to that of the mover, and to reliably attenuate input vibration with large acceleration and road noise over a wide frequency range.

a damper having a rod; an upper mount for a damper according to the present invention; an upper base connecting a vehicle body side and the upper bush; and a lower base connecting an upper end portion of the rod and the lower bush, The damper upper mount is surrounded from the outside in the radial direction, and a cylindrical cover body formed to be elastically deformable is provided, and the upper end portion and the lower end portion of the cover body are separately connected to the upper base and the lower base, respectively. and the cover body may include a mounting portion in which the mover is fitted.

A cylindrical cover body enclosing the damper upper mount from the outside in the radial direction is provided, and the upper end and the lower end of the cover body are connected to the upper base and the lower base, respectively, so that the mass and the mover are separated from each other. In addition, it becomes possible to prevent dust and the like from entering, and it is possible to ensure smooth vertical movement of the mover.
Since the cover body has the mounting portion in which the mover is fitted, it is possible to suppress the mover from wobbling with respect to the mass during standby before supplying the control current to the coil.

The upper base is provided with an upper stopper that protrudes downward and can contact the movable element in the vertical direction, and the lower base protrudes upward and can contact the movable element in the vertical direction. Side stops may be provided.

Since the upper and lower stoppers are separately provided on the upper base and the lower base, it is possible to suppress excessive displacement of the mover in the vertical direction.

According to the present invention, road noise can be attenuated over a predetermined frequency range.

1 is a longitudinal sectional view of a damper upper mount and a suspension device shown as a first embodiment; FIG. FIG. 10 is a vertical cross-sectional view of a damper upper mount and a suspension device shown as a second embodiment;

A damper upper mount and a first embodiment of a suspension device will be described below with reference to FIG.
The suspension device 1 includes a damper 11 , a damper upper mount 10 , an upper base 12 and a lower base 13 .

The damper 11 extends vertically and includes a rod 21 and a cylinder (not shown). The rod 21 and cylinder are arranged coaxially with a common axis.
Hereinafter, this common axis will be referred to as the rod axis O, the direction that crosses the rod axis O as viewed from above will be referred to as the radial direction, and the direction that rotates around the rod axis O as seen from the top will be referred to as the circumferential direction.

A rod 21 protrudes upward from the cylinder. A portion of the rod 21 protruding upward from the cylinder is surrounded by a bump stopper 22 from the outside in the radial direction. A male threaded portion is formed on the upper end portion of the rod 21 that protrudes upward from the bump stopper 22 . The upper end of the rod 21 is surrounded by a collar 23 from the outside in the radial direction. A nut N is screwed to a portion of the upper end portion of the rod 21 that protrudes upward from the collar 23 . A stepped portion 21a facing upward is formed in a portion of the upper end portion of the rod 21 located below the collar 23. As shown in FIG. A portion of the upper end portion of the rod 21 located below the collar 23 is inserted inside the fixing ring 29 . The fixing ring 29 is arranged on the step portion 21a.

The nut N is tightened to the upper end of the rod 21, and the lower end opening edge of the collar 23 and the upper surface of the fixing ring 29 sandwich the top wall 13a of the lower base 13, which will be described later, in the vertical direction. 13 is fixed. Rod 21 and collar 23 are provided in non-contact with upper base 12 .

The lower base 13 is formed in a truncated tubular shape. The lower base 13 is arranged coaxially with the rod axis O. A through hole into which the rod 21 is inserted is formed in the top wall 13 a of the lower base 13 . The peripheral edge of the opening of the through hole in the top wall 13 a is vertically sandwiched between the lower opening edge of the collar 23 and the upper surface of the fixing ring 29 . The peripheral wall of the lower base 13 includes an upper cylindrical portion 13b extending downward from the outer peripheral edge of the top wall 13a, an upper step portion 13c extending radially outward from the lower end of the upper cylindrical portion 13b, and It includes a lower tubular portion 13d extending downward from a radially outer end portion, and a lower stage portion 13e extending radially outwardly from the lower end portion of the lower tubular portion 13d. The upper end of the bump stopper 22 is fitted into the lower cylindrical portion 13d of the peripheral wall of the lower base 13. As shown in FIG.

The upper base 12 is formed in a cylindrical shape with a bottom. The upper base 12 is arranged coaxially with the rod axis O. A through hole into which the collar 23 is inserted is formed in the bottom wall 12 a of the upper base 12 . The bottom wall 12a of the upper base 12 is located below the upper end of the collar 23. As shown in FIG. The lower surface of the bottom wall 12a of the upper base 12 faces the upper surface of the top wall 13a of the lower base 13 with a vertical gap therebetween. The peripheral wall of the upper base 12 includes a lower cylindrical portion 12b extending upward from the outer peripheral edge of the bottom wall 12a, a lower step portion 12c extending radially outward from the upper end portion of the lower cylindrical portion 12b, and a lower step portion 12c. and an upper stepped portion 12e extending radially outward from the upper end of the upper cylindrical portion 12d. The inner diameter and outer diameter of the lower tubular portion 12b are the same as the inner diameter and outer diameter of the upper tubular portion 13b of the peripheral wall of the lower base 13, respectively.

The damper upper mount 10 includes an upper bush 24 connected to the vehicle body via the upper base 12 and a lower bush 25 connected to the upper end of the rod 21 via the lower base 13 . The upper bush 24 and the lower bush 25 are arranged coaxially with the rod axis O and arranged vertically.
The upper bushing 24 and the lower bushing 25 comprise an inner cylinder 10a surrounding the upper end portion of the rod 21 from the outside in the radial direction, an outer cylinder 10b surrounding the inner cylinder 10a from the outside in the radial direction, the inner cylinder 10a and the outer cylinder 10b. and an elastic body 10c connected to each other.

The inner cylinders 10a of the upper bushing 24 and the lower bushing 25 are separated in the vertical direction. The inner cylinder 10a of the upper bush 24 is fitted onto the lower cylinder portion 12b of the peripheral wall of the upper base 12 . The inner cylinder 10 a of the lower bushing 25 is fitted onto the upper cylinder portion 13 b of the peripheral wall of the lower base 13 .
The outer cylinders 10b of the upper bushing 24 and the lower bushing 25 are butted against each other in the vertical direction. The outer cylinder 10b of the upper bushing 24 faces the connecting portion between the lower step portion 12c and the upper cylindrical portion 12d of the upper base 12 with a vertical gap therebetween. The outer cylinder 10b of the lower bushing 25 faces the upper surface of the upper step portion 13c of the peripheral wall of the lower base 13 with a vertical gap therebetween.
In the elastic bodies 10c of the upper bushing 24 and the lower bushing 25, the inner end surfaces that face each other in the vertical direction are separated in the vertical direction over the entire area except for the radially outer end portion.

The upper bushing 24 and the lower bushing 25 are formed to have the same shape and size. The upper bushing 24 and the lower bushing 25 are provided so as to be vertically opposite to each other.

In this embodiment, masses 26 are provided in contact with the outer peripheral surfaces of the outer cylinders 10b of the upper bushing 24 and the lower bushing 25, respectively.
In the illustrated example, the mass 26 is formed in a tubular shape and is integrally fitted onto the outer cylinders 10b of the upper bushing 24 and the lower bushing 25, respectively. The upper end portions of the mass 26 and the outer cylinder 10b of the upper bushing 24 are positioned at the same position in the vertical direction. The lower ends of the mass 26 and the outer cylinder 10b of the lower bushing 25 are positioned at the same position in the vertical direction.

The elastic body 10c of the upper bush 24 is formed with a first stopper 24a that protrudes upward and can abut on the upper base 12 in the vertical direction. The first stopper 24a faces the lower surface of the lower portion 12c of the upper base 12 with a vertical gap therebetween. The upper end of the first stopper 24a is located above the mass 26 and the outer cylinder 10b of the upper bush 24. As shown in FIG.

The elastic body 10c of the lower bushing 25 is formed with a second stopper 25a that protrudes downward and can come into contact with the lower base 13 in the vertical direction. The second stopper 25a faces the upper surface of the upper step portion 13c of the peripheral wall of the lower base 13 with a vertical gap therebetween. The lower end of the second stopper 25a is located below the mass 26 and the outer cylinder 10b of the lower bushing 25. As shown in FIG.

The first stopper 24a and the second stopper 25a are formed at radially outer ends of the elastic body 10c. The first stopper 24a and the second stopper 25a extend continuously over the entire length in the circumferential direction. The first stopper 24a is formed in a curved surface that protrudes upward. The second stopper 25a is formed in a curved surface protruding downward.

At least one of the upper base 12 and the lower base 13 is provided with a third stopper 27 that comes into contact with the other when a large-amplitude vibration is input in a direction that raises the rod 21 .
The third stopper 27 is annularly formed of a rubber material or the like, and arranged coaxially with the rod axis O. As shown in FIG. The third stopper 27 is provided on the top surface of the top wall 13 a of the lower base 13 . The third stopper 27 faces the lower surface of the bottom wall 12a of the upper base 12 with a vertical gap therebetween.

At least one of the upper base 12 and the rod 21 is provided with a fourth stopper 28 that comes into contact with the other when a large-amplitude vibration is input in a direction that lowers the rod 21 .
Here, a flange portion 23a is formed at the upper end portion of the collar 23 so as to protrude radially outward and extend continuously over the entire length in the circumferential direction. The fourth stopper 28 is provided on the lower surface of the flange portion 23a. The fourth stopper 28 faces the upper surface of the bottom wall 12a of the upper base 12 with a vertical gap therebetween. A fourth stopper 28 is provided on the rod 21 via the collar 23 .

Each vertical gap between the third stopper 27 and the fourth stopper 28 and the bottom wall 12a of the upper base 12 is the gap between the first stopper 24a and the lower surface of the lower step portion 12c of the upper base 12. It is larger than the vertical gap and the vertical gap between the second stopper 25 a and the upper surface of the upper step portion 13 c of the peripheral wall of the lower base 13 . The vertical clearances between the third stopper 27 and the fourth stopper 28 and the bottom wall 12a of the upper base 12 are larger than the vertical clearances between the inner cylinders 10a of the upper bushing 24 and the lower bushing 25, respectively. It's getting smaller.
Note that the size relationship between these gaps may be changed as appropriate.

Furthermore, in this embodiment, a vibrating mechanism 31 that vibrates the upper bushing 24 and the lower bushing 25 in the vertical direction via the mass 26 is provided.
The vibrating mechanism 31 includes either one of a permanent magnet 32 and a coil 33 provided on the mass 26, a mover 34 surrounding the mass 26 from the outside in the radial direction and capable of moving up and down, and a movable and the other of the permanent magnet 32 and the coil 33 provided on the element 34 .

Here, the damper upper mount 10 includes an acceleration sensor (not shown) provided on the mass 26 and a controller (not shown).
The controller supplies a control current to the coil 33 based on the data from the acceleration sensor. When the control current is supplied to the coil 33 , the mover 34 moves up and down, and the reaction force of the acceleration of the mover 34 generated at this time is applied to the mass 26 . This cancels out the acceleration generated in the mass 26 due to the input vibration.

Two recessed portions are formed on the outer peripheral surface of the mass 26 with a space therebetween in the vertical direction. A plurality of sets of the two recesses are provided at intervals in the circumferential direction. Permanent magnets 32 are individually fixed in all the recesses. Permanent magnets 32 adjacent to each other in the vertical direction have opposite magnetic poles adjacent to each other. A plurality of sets of permanent magnets 32 are provided at respective positions that sandwich the rod axis O in the radial direction. The vertical sizes of the mass 26 and the mover 34 are equal to each other.

The mover 34 includes a core body 36 made of a magnetic material and a holder 37 that accommodates the core body 36 and the coil 33 . The mover 34 and coil 33 are spaced radially outward from the mass 26 and permanent magnet 32 . The vertical positions and vertical sizes of the core body 36 and the holder 37 are equal to each other.

The core body 36 includes a radially extending winding core 38 and an outer frame 39 that covers the winding core 38 from above, below, and from the outside in the radial direction. A coil 33 is wound around the winding core 38 . The size of the winding core 38 in the vertical direction is equal to the interval between the permanent magnets 32 adjacent to each other in the vertical direction. The upper end and lower end of the coil 33 are radially opposed to the vertically adjacent permanent magnets 32 , respectively. A plurality of core bodies 36 are provided at intervals in the circumferential direction.
The holder 37 is formed in an annular shape and arranged coaxially with the rod axis O. As shown in FIG. A plurality of housing recesses 37a in which the core bodies 36 and the coils 33 are housed are formed on the inner peripheral surface of the holder 37 at intervals in the circumferential direction. The accommodation recess 37a penetrates the holder 37 in the vertical direction.

The suspension device 1 includes a cylindrical cover body 41 that surrounds the damper upper mount 10 from the outside in the radial direction. The cover body 41 is elastically deformable and arranged coaxially with the rod axis O. As shown in FIG. The cover body 41 is made of, for example, a rubber material.
An upper end portion and a lower end portion of the cover body 41 are separately connected to the upper base 12 and the lower base 13, respectively. The upper end portion of the cover body 41 is fitted onto the upper step portion 12 e of the upper base 12 . A lower end portion of the cover body 41 is fitted onto the lower step portion 13 e of the lower base 13 .

The cover body 41 has a mounting portion 42 to which the mover 34 is fitted. The mounting portion 42 is provided between the upper end portion and the lower end portion of the cover body 41 . A holder 37 of the mover 34 is fitted in the mounting portion 42 .
A bellows portion 43 capable of expanding and contracting in the vertical direction is formed in a portion positioned between the mounting portion 42 and the upper end portion and a portion positioned between the mounting portion 42 and the lower end portion of the cover body 41 . It is The bellows portion 43 extends vertically while bending in the radial direction.

The upper base 12 is provided with an upper stopper 44 that protrudes downward and can come into contact with the mover 34 in the vertical direction. The upper stopper 44 is provided on the upper step portion 12 e of the upper base 12 . The upper stopper 44 is formed integrally with the cover body 41 . The upper stopper 44 extends continuously over the entire length in the circumferential direction. The lower end surface of the upper stopper 44 faces the upper end surface of the holder 37 of the mover 34 with a vertical gap therebetween.

The lower base 13 is provided with a lower stopper 45 that protrudes upward and can come into contact with the mover 34 in the vertical direction. The lower stopper 45 is provided on the upper surface of the lower step portion 13 e of the lower base 13 . The lower stopper 45 extends continuously over the entire length in the circumferential direction. The upper end surface of the lower stopper 45 faces the lower end surface of the holder 37 of the mover 34 with a vertical gap therebetween. This gap is equivalent to the vertical gap between the lower end surface of the upper stopper 44 and the upper end surface of the holder 37 .

The lower stopper 45 is located radially inside the upper stopper 44 . The volume of the lower stopper 45 is larger than the volume of the upper stopper 44 . The vertical sizes of the lower stopper 45 and the upper stopper 44 are equal to each other. The radial size of the lower stopper 45 is larger than the radial size of the upper stopper 44 .

As described above, according to the damper upper mount 10 and the suspension device 1 according to the present embodiment, the masses 26 are provided in contact with the outer peripheral surfaces of the outer cylinders 10b of the upper bushing 24 and the lower bushing 25, respectively. Therefore, the vibration from the tire transmitted to the rod 21 passes through the lower bushing 25, the mass 26, and the upper bushing 24 in this order, and is transmitted to the vehicle body side.
This allows the mass 26 to be placed in the transmission path of vibration from the rod 21 through the lower bushing 25 to the upper bushing 24, and not only at a certain frequency due to the inertia of the mass 26, but also above this frequency. can attenuate road noise over a predetermined frequency range.

Furthermore, since the vibrating mechanism 31 for vertically vibrating the upper bushing 24 and the lower bushing 25 via the mass 26 is provided, the upper bushing 24 and the lower bushing 25 are vibrated, for example, in opposite phases with respect to the input vibration. and the lower bushing 25 can be vibrated, and even input vibrations with large acceleration can be damped, and the vibration is not limited to a specific frequency caused by the inertial force of the mass 26, but is lower than this. It can attenuate road noise over a wide frequency range including frequencies.

Since the vibrating mechanism 31 includes a permanent magnet 32 , a coil 33 , and a mover 34 , when a control current is supplied to the coil 33 to vibrate the mover 34 in the vertical direction, the mass 26 It is possible to cause the upper bushing 24 and the lower bushing 25 to vibrate in a phase opposite to that of the mover 34, thereby reliably damping input vibration with large acceleration and road noise over a wide frequency range.

A cylindrical cover body 41 is provided to surround the upper damper mount 10 from the outside in the radial direction. and the mover 34 can be prevented from entering, and smooth vertical movement of the mover 34 can be ensured.
Since the cover body 41 has the mounting portion 42 in which the mover 34 is fitted, the mover 34 is prevented from wobbling with respect to the mass 26 during standby before supplying the control current to the coil 33. can do.

Since the upper stopper 44 and the lower stopper 45 are separately provided on the upper base 12 and the lower base 13, excessive displacement of the mover 34 in the vertical direction can be suppressed.

The elastic body 10c of the upper bushing 24 is formed with a first stopper 24a capable of contacting the upper base 12 in the vertical direction, and the elastic body 10c of the lower bushing 25 is formed with a second stopper 24a capable of contacting the lower base 13 in the vertical direction. Since the stopper 25a is formed, when the mass 26 is about to resonate due to the input of vibration, for example, the first stopper 24a and the second stopper 25a can be brought into contact with the upper base 12 and the lower base 13, respectively. This makes it possible to prevent the mass 26 from colliding with other members.

At least one of the upper base 12 and the lower base 13 is provided with a third stopper 27, and at least one of the upper base 12 and the rod 21 is provided with a fourth stopper 28, so that the rod 21 is raised. When a large-amplitude vibration in the direction is input, the upper base 12 and the lower base 13 are brought into contact with each other via the third stopper 27, and when a large-amplitude vibration in the direction to lower the rod 21 is input, The upper base 12 and the rod 21 can be brought into contact with each other via the fourth stopper 28, and excessive displacement of the rod 21 in the vertical direction can be suppressed.

Next, a damper upper mount 20 and a suspension device 2 according to a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the same reference numerals are assigned to the same components as in the first embodiment, the description thereof is omitted, and only the different points will be described.

In this embodiment, the mass 26 is provided with a coil 33 and the mover 34 is provided with a permanent magnet 32 .

The coil 33 is wound in the circumferential direction. The outer peripheral surface of the mass 26 is formed with a recess extending continuously over the entire length in the circumferential direction. A coil 33 is accommodated in the recess. The coil 33 is arranged coaxially with the rod axis O. The vertical center portions of the coil 33 and the mass 26 are aligned. The mass 26 is made of a magnetic material.

The permanent magnet 32 is formed in a cylindrical shape and arranged coaxially with the rod axis O. As shown in FIG.
Here, the mover 34 does not have the core body 36, and the inner peripheral surface of the holder 37 is formed with an accommodation recess 37a in which the permanent magnet 32 is accommodated. The housing recess 37a extends continuously over the entire length in the circumferential direction. The housing recess 37a opens upward.
The outer peripheral surface of the permanent magnet 32 is in contact with the bottom surface of the inner surface of the housing recess 37a, which is located at the radially outer end and faces radially inward. The permanent magnet 32 and mover 34 are spaced radially outward from the mass 26 and coil 33 .

As described above, the damper upper mount 20 and the suspension device 2 according to this embodiment have the same effects as those of the above embodiment.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, collar 23 and retaining ring 29 may be integrally formed with rod 21 .
The first stopper 24a, the second stopper 25a, the third stopper 27, the fourth stopper 28, the upper stopper 44, and the lower stopper 45 may be omitted.
The vibrating mechanism 31 is not limited to the above-described embodiment, and actuators having other configurations may be employed.

In addition, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the scope of the present invention, and the above-described embodiments and modifications may be combined as appropriate.

Reference Signs List 1, 2 suspension device 10, 20 upper mount for damper 10a inner cylinder 10b outer cylinder 10c elastic body 11 damper 12 upper base 13 lower base 21 rod 24 upper bush 25 lower bush 26 mass 31 vibration mechanism 32 permanent magnet 33 coil 34 movable child 41 cover body 42 mounting portion 44 upper stopper 45 lower stopper

Claims (5)

an upper bush connected to the vehicle body;
a lower bush connected to the upper end of the rod of the damper, and
The upper bushing and the lower bushing are
an inner cylinder surrounding the upper end of the rod from the outside in the radial direction;
an outer cylinder surrounding the inner cylinder from the outside in the radial direction;
an elastic body that connects the inner cylinder and the outer cylinder to each other,
the inner cylinders of the upper bushing and the lower bushing are separated in the vertical direction,
a mass in contact with the outer peripheral surface of the outer cylinder of each of the upper bushing and the lower bushing;
A damper upper mount, comprising: a vibrating mechanism that vertically vibrates the upper bushing and the lower bushing via the mass. The vibration mechanism is
one of a permanent magnet and a coil provided in the mass;
a mover that encloses the mass from the outside in the radial direction and is provided so as to move up and down;
2. The damper upper mount according to claim 1, comprising the other of said permanent magnet and said coil provided on said mover. a damper having a rod;
a damper upper mount according to claim 1 or 2;
an upper base that connects the vehicle body side and the upper bush;
A suspension device comprising: a lower base that connects an upper end of the rod and the lower bush. a damper having a rod;
a damper upper mount according to claim 2;
an upper base that connects the vehicle body side and the upper bush;
a lower base that connects the upper end of the rod and the lower bush,
a tubular cover body enclosing the damper upper mount from the outside in the radial direction and formed to be elastically deformable,
an upper end portion and a lower end portion of the cover body are separately connected to the upper base and the lower base, respectively;
The suspension device, wherein the cover body includes a mounting portion in which the mover is fitted. The upper base is provided with an upper stopper that protrudes downward and can contact the movable element in the vertical direction,
5. The suspension device according to claim 4, wherein the lower base is provided with a lower stopper that protrudes upward and can abut against the mover in the vertical direction.

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