JPH1137213A - Vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compact a stopper mechanism, for limiting relative displacement quantity to a fitting member of a mass member, by simple structure; in a vibration damper provided with an exciting means for elastically connecting the mass member, via a supporting rubber elastic body, to the fitting member, and also exciting the mass member to the fitting member. SOLUTION: An abutting part 24, positioned oppositely in a vibration input direction to a vibration damping object 12, is provided on a fitting member 14 fixedly fitted to the object 12; and also an annular stopper part 54, put into and positioned between opposite surfaces of these object 12 and the abutting member 24, is fixedly provided to a mass member 16 to limit the relative displacement quantity of the mass member 16 to the fitting member 14 by making the stopper part 54 to abut on the object 12 side and the abutting part 24 side; and on the other hand, the mass member 16 is elastically connected between the stopper part 54 and the fitting member 14 by interposing a supporting rubber elastic body 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damper mounted on a vibration damping object to reduce vibration in the vibration damping object, and more particularly to a vibration damper capable of actively reducing vibration.

[0002]

2. Description of the Related Art A dynamic vibration absorber (dynamic damper) has been widely known as a means for reducing the vibration of a vibration-damping object such as a car body which is a member in which vibration is a problem. ing. In recent years, in order to obtain a more advanced vibration damping effect, an active vibration damping device that suppresses or controls the vibration of the vibration damping target by applying a vibration force to the vibration damping target has also been proposed. As one type, Japanese Patent Application Laid-Open Nos. 3-292219 and 6-23
Japanese Patent No. 5438 and the like disclose that a mass member is elastically supported via a spring member with respect to an attachment member attached to a vibration damping target to form one vibration system, and that a vibration force is applied to the mass member of the vibration system. There is disclosed a vibration damper that is provided with an electromagnetic drive mechanism that exerts a vibration force of a vibration system to exert a large excitation force on a vibration damping target.

[0003] In a vibration damper, the amplitude of a mass member may be significantly increased due to the input of an impact load or the overlap of a plurality of input vibrations, which may adversely affect the vibration damping effect. When an elastic body is adopted, excessive deformation may be caused in the rubber elastic body and durability may be reduced. However, as described above, an electromagnetic drive mechanism that applies an exciting force to the vibration system is provided. In the case of the vibration damper, a stopper mechanism having a simple structure for restricting an excessive amplitude of the mass member has not yet been realized.

[0004]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a vibration system and an electromagnetic drive mechanism for applying an exciting force to the vibration system. The object of the present invention is to realize a stopper mechanism for limiting the amplitude of the mass member with a simple structure in the vibration damper provided with the above.

[0005]

In order to solve such a problem, the present invention is characterized in that a mounting member fixedly mounted on a vibration damping object and a relative displacement in a vibration input direction with respect to the mounting member. A mass member arranged as possible is connected by a supporting rubber elastic body interposed between the two members, and a vibration force exerting a vibration force in a vibration input direction between the mass member and the mounting member. In the vibration damper provided with the means, a contact portion extending outward from the mounting member at right angles to the vibration input direction is provided at a position separated from the mass member on the vibration damping target side. While extending cylindrically in the vibration input direction straddling the outer peripheral side of the corresponding contact portion from the mass member toward the vibration damping target side, and located between the opposing surface of the corresponding contact portion and the vibration damping target, By contacting these contact parts and the opposing surface of the damping object A stopper portion for limiting a relative displacement amount of the mass member with respect to the vibration control target in a vibration input direction, and the support rubber is provided between the stopper portion and an opposing surface of the mounting member orthogonal to the vibration input direction. The elastic body was interposed.

In such a vibration damper having a structure according to the present invention, one vibration system is constituted by the mass member being elastically supported by the mounting member via a supporting rubber elastic body. , Based on the exciting force of the exciting means,
In such a vibration system, the mass member is displaced and vibrated. In addition, the amount of displacement of the mass member in the vibration input direction is limited by the stopper provided on the mass member abutting on the opposing surface of the mounting member against the object to be damped.

Therefore, in such a stopper portion, only a single stopper portion is formed on the mass member side.
A stopper mechanism capable of limiting the amount of displacement (amplitude) on both sides of the mass member in the vibration input direction is advantageously realized with a simple and compact structure, and the durability of the support rubber elastic body and hence the vibration damper is advantageously secured. Because Moreover,
Since the contact surface of the stopper portion can be formed continuously in the circumferential direction into an annular shape, the contact surface can be set sufficiently large, and the strength of the stopper portion can be advantageously secured.

The specific shape of the stopper portion in the present invention is, for example, a cylindrical portion which is opposed to the mounting member at a predetermined distance in a direction perpendicular to the vibration input direction, and a cylindrical portion. A flange-shaped portion integrally formed at both ends in the axial direction is preferably adopted, and a support rubber elastic body is interposed between the cylindrical portion and the opposing surface of the stopper portion, while one of the axially outer portions is provided. In the direction of the flange-shaped part, it is fixed to the tubular part extending over the outer peripheral side of the contact part and attached to the mass member, and the flange-shaped part on both sides allows the contact part and the damping target to be fixed. An abutment surface is configured.

Further, in the vibration damper having the structure according to the present invention, in order to reduce an impact or a hitting sound at the time of contact with the contact portion of the stopper portion or the object to be damped, the stopper portion comes into contact with the contact portion. It is desirable to dispose a cushioning rubber on the contact portion or on the contact surface of the object to be damped, and it is particularly preferable that the stopper rubber be provided on both surfaces of the stopper portion on both sides in the vibration input direction. In addition, a configuration is adopted in which cushion rubber protruding toward the abutting portion and the vibration damping target is formed integrally with the support rubber elastic body. When such a configuration is employed, the buffer rubber is integrally formed by the support rubber elastic body, so that the structure can be further simplified.

Further, in the vibration damper having the structure according to the present invention, as described in claim 3, a guide rod extending in the vibration input direction is provided on the mounting member, and the guide rod is provided on the guide rod. On the other hand, a configuration in which the mass member is extrapolated and arranged so that the guide member guides the mass member in the vibration input direction is suitably adopted. When such a configuration is employed, irregular displacement of the mass member is regulated, so that adverse effects on vibration in a direction different from the vibration to be reduced can be reduced or avoided.

Further, in the vibration damper having the structure according to the present invention, as the vibration means, for example, the mass member is formed to include a permanent magnet, and A coil that is disposed in a magnetic field generated by the permanent magnet and generates an electromagnetic force when energized is supported by the abutting portion, and a vibrating unit including the permanent magnet and the coil, or As described in claim 5, a part of a wall formed between the mounting member and the mass member is formed of the supporting rubber elastic body, and the working air is closed to an external space. Vibration means or the like, which includes a chamber and an air passage which is communicated with the working air chamber and exerts air pressure fluctuations on the working air chamber, is suitably employed. In particular, if the electromagnetic vibrating means according to claim 4 is adopted, the vibrating force can be controlled with high accuracy over a wide frequency range, and the coil is supported using the contact portion. Therefore, the coil support structure can be simplified, and the mass member is configured to include the permanent magnet. Can be advantageously secured. Further, if the pneumatic vibrating means according to claim 5 is adopted, there is no need to incorporate a special vibrating force generating member into the vibration damper, so that the number of parts is reduced, the structure is simplified, and the size is reduced. Compactness can be advantageously achieved. It is also possible to employ both the electromagnetic vibrating means according to claim 4 and the pneumatic vibrating means according to claim 5 together.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a vibration damper 10 according to a first embodiment of the present invention. This vibration damper 10
The mass member 16 is attached to a mounting member 14 as an attachment member attached to the vibration body 12 to be damped.
Elastically connected via a supporting rubber elastic body 18,
Thus, one vibration system is configured in which the mass member 16 is a mass system and the support rubber elastic body 18 is a spring system.
The coil 2 is provided between the mounting bracket 14 and the mass member 16.
An electromagnetic drive mechanism including a zero and a permanent magnet 22 is incorporated, and an excitation force is exerted on the vibration system by the electromagnetic drive mechanism. Then, the exciting force in this vibration system is transmitted to the vibrating
Thus, the vibration in the vibrating body 12 can be actively suppressed. In addition, the vibration damper 10 of the present embodiment can exert an effective vibration damping effect against the vertical vibration in FIG. In the following description, the vertical direction in FIG. 1 is simply referred to as the vertical direction.

More specifically, the mounting bracket 14 has a small-diameter hollow rod shape, and an axially intermediate portion thereof includes:
Annular plate-shaped contact plate 2 that extends outward in the direction perpendicular to the axis
4 is extrapolated and fixed in position by press-fitting, bonding or the like. The contact plate 24 is formed of a rigid material such as a metal and a hard resin which is not easily deformed. A large-diameter cylindrical holding cylinder 26 extending downward is integrally formed on the outer peripheral edge of the contact plate 24, and the coil 20 is wound around the outer peripheral surface of the holding cylinder 26 so as to be fixed. It is attached to. Further, a cover cylinder 28 is fixed to the outer peripheral surface of the holding cylinder 26, and the coil 20 is covered and protected by the holding cylinder 26 and the cover cylinder 28. In short, the bobbin of the coil 20 is constituted by the holding cylinder 26, and the coil 20 is fixedly attached to the attachment fitting 14 via the contact plate 24.
A screw hole 30 is formed in the mounting member 14 by an opening at the upper end in the axial direction of the hole 29. To be fixedly mounted.

On the other hand, the mass member 16 is provided with a disk-shaped permanent magnet 22 having both magnetic poles set on both side surfaces in the axial direction.
An annular block-shaped first yoke 32 having substantially the same inner and outer diameters as the above, and a disk-shaped second yoke 34 having an inner diameter substantially equal to the permanent magnet 22 and an outer diameter larger than the permanent magnet 22.
Are superimposed on each other and are integrally fixed by fixing bolts 36. Outside the permanent magnet 22 and the first yoke 32 in the radial direction, a third yoke 38 having a thin, large-diameter cylindrical shape is disposed at a predetermined distance from the second yoke 34. Is mounted on the outer peripheral portion of the.
Furthermore, these first, second and third yoke members 32,
A cover fitting 40 having a thin cylindrical shape with a bottom is externally inserted into the cover fittings 34 and 38, and the first, second and third yoke members 32, 34 and 38 are accommodated and arranged in the cover fitting 40. ing. The cover fitting 40 has a bottom wall portion 42.
Is overlapped on the lower surface of the second yoke 34, the peripheral wall portion 44 is overlapped on the outer peripheral surfaces of the second and third yoke members 34 and 38, and the opening peripheral edge portion 46 of the peripheral wall portion 44 is The third yoke 38 is fixed to the second yoke 34 by being bent radially inward by caulking or the like and locked and fixed to the upper end surface of the third yoke 38. The first, second and third yokes 32,
Both 34 and 38 are formed of a ferromagnetic material such as iron.

That is, in the mass member 16 formed by combining the first, second and third yokes 32, 34, 38 in this manner, the first and second yokes 32, 34, 38 are connected to both magnetic poles of the permanent magnet 22. Second and third yokes 32, 34, 3
8, a closed magnetic path that forms an annular shape outside the permanent magnet 22 in the radial direction is formed. On the magnetic path, a circumferentially continuous portion is provided between the outer peripheral surface of the first yoke 32 and the inner peripheral surface of the third yoke 38 which are opposed to each other at a predetermined distance in the radial direction. , A cylindrical magnetic gap 48 opening upward is formed. As a result, both magnetic poles are formed on the opposing surfaces of the first yoke 32 and the third yoke 38 that face each other with the magnetic gap 48 interposed therebetween, and a magnetic field is effectively formed in the magnetic gap 48 interposed between the magnetic poles. It is supposed to be. In the mass member 16, a central hole 50 that opens upward on the central axis is formed by the central holes of the permanent magnet 22 and the first and second yokes 32 and 34. A sliding bush 52 is inserted and fixedly attached to the bottom portion of 50.

The mounting member 14 is combined with the mass member 16 from above in the axial direction, so that the mounting member 14 is inserted into the central hole 50 of the mass member 16 and the mass member 16 is inserted. The coil 20 supported by the holding cylinder 26 is inserted and arranged in the magnetic gap 48. In addition, the mounting bracket 14 is formed to have an outer diameter smaller than the center hole 50, and a tip end thereof is inserted into a sliding bush 52 installed at the bottom of the center hole 50, whereby The mass member 16 is guided in the axial direction with respect to the mounting bracket 14, so that rattling in the direction perpendicular to the axis is prevented and smooth relative displacement in the axial direction is allowed. The holding cylinder 2 that covers the inner and outer peripheral surfaces of the coil 20
6 and the cover cylinder 28 are radially opposed to each other with a slight gap from the opposed inner surface of the magnetic gap 48, whereby the coil 20 covered by the holding cylinder 26 and the cover cylinder 28 is formed. Are axially displaceable within the magnetic gap 48. In short, the mass member 16 and the mounting bracket 14 are arranged coaxially and relatively displaceable in the axial direction. As is apparent from this, in the present embodiment, the sliding bush 52 is inserted.
A guide rod for guiding the mass member is formed by the lower end portion in the axial direction of the mounting bracket 14.

Further, the upper end portion of the third yoke 38 of the mass member 16 projects higher than the upper end surface of the first yoke 32 in the axial direction. The upper end of the yoke 38 is positioned so as to extend over the outer peripheral side of the contact plate 24 provided on the mounting bracket 14 and protrude upward from the contact plate 24. And this third yoke 3
The connection fitting 54 is fixedly attached to the upper end of the connector 8. The connecting metal fitting 54 has a cylindrical portion 56 having a cylindrical shape smaller in diameter than the outer diameter of the contact plate 24, and an upper flange-like portion 58 extending radially outward from both ends in the axial direction and a lower flange portion 58. The flange-shaped portions 60 are formed integrally with each other. In particular, the lower flange 60
Is larger in diameter than the upper flange-shaped portion 58, the outer peripheral edge of the lower flange-shaped portion 60 is overlapped with the axial end surface of the third yoke 38, and the opening peripheral edge 4 of the cover fitting 40 is formed.
The connection fitting 54 is fixedly attached to the mass member 16 by being caulked and fixed at 6.

A cylindrical fitting sleeve 62 is coaxially disposed at a predetermined distance inside the connecting fitting 54 in the radial direction, and is fitted to the cylindrical portion 56 of the connecting fitting 54. The supporting rubber elastic body 18 is interposed between the facing surfaces of the mounting sleeve 62 in the radial direction. The supporting rubber elastic body 18 has a substantially annular plate shape, and is integrally vulcanized in which a connection fitting 54 is vulcanized and bonded to an outer peripheral surface and a fitting sleeve 62 is vulcanized and bonded to an inner peripheral surface. A molded product 70 is provided. The thickness of the support rubber elastic body 18 in the axial direction becomes thinner toward the outer peripheral side, so that the internal stress generated by the elastic deformation is made uniform.

Further, the connecting fitting 54 is provided with a covering rubber 64 for covering substantially both the axial end faces and the outer peripheral face thereof.
The upper and lower cushioning rubber layers 6 are provided integrally with the supporting rubber elastic body 18 and project at a predetermined height on the axially outer surfaces of the upper and lower flange-like portions 58 and 60 by the covering rubber 64.
6, 68 are respectively formed.

Then, the fitting sleeve 62 is attached to the mounting bracket 14.
The fitting sleeve 62 is fixed to the upper end of the mounting bracket 14 in the axial direction. Thereby,
The mass member 16 caulked and fixed to the connecting fitting 54 is elastically connected to the mounting fitting 14 via the supporting rubber elastic body 18 and is elastically supported. In addition,
It is desirable that the press-fitting of the fitting sleeve 62 into the fitting 14 be performed before the connecting fitting 54 is fixed by caulking to the mass member 16, for example, the contact plate 24 supporting the coil 20.
After assembling the integrally vulcanized molded product 70 with the mounting bracket 14,
The mass damper 10 can be advantageously manufactured by mounting the mass member 16 to the mounting bracket 14 from below in the axial direction and then caulking and fixing the connecting metal fitting 54 to the upper end of the mass member 16. It is possible.

The vibration damper 10 formed as described above is
The mounting member 14 is mounted on the vibrating body 12 to be damped by being fixed to the vibrating body 12 with mounting bolts 31, whereby the mass member 16 moves the supporting rubber elastic body 18 against the vibrating body 12. Through the elastic support,
One vibration system is configured. Further, under such an attached state, the connection fitting 54 fixed to the mass member 16 is
The vibrating body 12 and the abutment plate 24 fixed to the mounting bracket 14 are positioned between the opposing surfaces 72 and 74 in the axial direction (vibration input direction), and are positioned on both sides of the coupling bracket 54 in the axial direction. Upper and lower flange-shaped portions 58, 60 formed on
Are opposed surfaces 72, 74 of the vibrating body 12 and the contact plate 24.
Are opposed to each other at a predetermined distance in the vibration input direction.

As is apparent from this, in the present embodiment, the upper end portion of the third yoke 38 of the mass member 16 forms a cylindrical portion extending from the mass member 16 toward the vibrating body 12. In addition, the stopper 54 is formed by the connecting fitting 54 so as to enter between the opposing surfaces of the vibrating body 12 and the abutting plate 24, and the mass member 16 is formed by using the stopper. , Are elastically connected to the mounting bracket 14.

Thus, in such a vibration damper 10,
When the coil 20 is energized, an axial (vertical) electromagnetic force is generated between the coil 20 and the mass member 16 forming a magnetic path in relation to the magnetic field existing in the magnetic gap 48. When an alternating current or a pulsating current is supplied to the coil 20, an exciting force is exerted between the coil 20 and the mass member 16 by the electromagnetic force. Therefore, vibrator 1
By controlling the supply current to the coil 20 based on the reference signal corresponding to the vibration to be damped in 2, the vibrating body 12 can vibrate to actively reduce the vibration to be damped. You can exert power. In this case, in particular, in the vibration damper 10, since the supporting rubber elastic body 18 and the mass member 16 constitute one vibration system, the natural frequency of this vibration system is reduced by the vibration frequency to be damped. By tuning in response to the above, a large excitation force is exerted on the vibrating body 12 with small power consumption by utilizing the resonance action of the vibration system, and an efficient vibration damping effect can be obtained. .

Further, in the vibration damper 10 as described above, the connection fitting 54 fixed to the mass member 16 is provided between the opposing surface of the vibrating body 12 and the contact plate 24 as the mass member 16 is vibrated. When the amount of displacement of the mass member 16 increases, the upper and lower flange-like portions 58, 60 of the connecting metal fitting 54 contact the vibrating body 12 and the contact plate 24 via the upper and lower cushioning rubber layers 66, 68. You will be abutted.
When the connection fitting 54 comes into contact with the vibrating body 12 and the contact plate 24, the relative displacement of the mass member 16 with respect to the vibrating body 12 is reliably limited in both vibration directions. As a result, the occurrence of an irregular vibration force due to the input of a force or the like and the excessive deformation of the supporting rubber elastic body 18 are reduced or prevented, so that a stable vibration damping effect and good durability are advantageously exhibited. .

There, the mass member 16 and the vibrating body 12
Since the stopper mechanism for limiting the relative displacement amount with the support member 54 is configured using the connection fitting 54 for connecting the mass member 16 to the supporting rubber elastic body 18, the stopper mechanism for limiting the displacement amount on both sides in the vibration direction is provided. It can be realized very advantageously with a small number of parts and a simple structure.

In particular, in the vibration damper 10 of the present embodiment, the support member of the coil 20 is formed by using the contact plate 24 that limits the displacement of the mass member 16 by the contact of the connection fitting 54. As a result, the number of parts and the reduction in size can be more advantageously achieved.

Further, in the vibration damper 10 of the present embodiment, the cushioning rubber layers 66 and 68 for mitigating the shock at the time of the contact of the connecting fitting 54 with the contact plate 24 and the vibrating body 12 are provided with support rubber elasticity. Since it is vulcanized and formed integrally with the body 18, extremely excellent manufacturability is achieved.

Next, FIG. 2 shows a vibration damper 80 as a second embodiment of the present invention. Note that the vibration damper 80 of the present embodiment shows a specific example of the vibration means different from the first embodiment, and has a structure similar to that of the vibration damper according to the first embodiment. For members and parts,
In the figure, the same reference numerals as in the first embodiment denote the same parts, and a detailed description thereof will be omitted.

The vibration damper 80 of the present embodiment has a large-diameter bottomed cylindrical shape with respect to a thick-walled cylindrical mass block 82 formed of a single component made of a high specific gravity material such as metal. The mass member 16 is configured by the cover metal 40 being extrapolated and fixedly assembled. In addition,
The mass block 82 has a cylindrical portion 84 that protrudes upward in the axial direction from the outer peripheral edge and extends upward so as to straddle the outer peripheral side of the annular plate-shaped contact plate 24 fixed to the mounting bracket 14. Are integrally formed, and the connecting fitting 54 is caulked and fixed to the distal end surface of the tubular portion 84.

Further, at the swaged portion of the connecting fitting 54 in the mass block 82, a thin seal rubber 86 formed on the surface of the connecting fitting 54 is sandwiched to be sealed in a fluid-tight manner. As a result, the opening of the cover fitting 40 that constitutes the mass member 16 is closed in a fluid-tight manner by the supporting rubber elastic body 18, so that a part of the wall portion is provided between the mounting fitting 14 and the mass member 16. Is formed by a supporting rubber elastic body 18, and a working air chamber 88 hermetically closed to an external space is formed. The working air chamber 88
As shown in FIG. 2, the center hole 50 of the mass block 82 in which the mounting bracket 14 is inserted and the inner hole 8 of the cylindrical portion 84 of the mass block 82 in which the contact plate 24 is accommodated and arranged.
9. Also, seal rubber 86
Are vulcanized and formed integrally with the supporting rubber elastic body 18 and the covering rubber 64.

Further, the mounting bracket 14 has a bolt 90 at the upper end in the axial direction, and a nut 92 is screwed into the bolt 90 so as to be fixedly attached to the vibrating body 12. Has become. In addition, an air supply / discharge passage 94 is formed inside the mounting bracket 14 so as to extend in the axial direction from the upper end, bend in the direction perpendicular to the axis, and open to the outer peripheral surface of the intermediate portion in the axial direction. The air supply / discharge passage 94 communicates with the working air chamber 88 on the opening side of the axially intermediate portion of the mounting bracket 14. On the other hand, a port 96 that protrudes outward in the axial direction from the upper end of the mounting bracket 14 is integrally formed on the opening side of the upper end of the mounting bracket 14 in the air supply / discharge path 94 in the axial direction. The air line 98 is connected to the port 96 under the state of being mounted on the vibrating body 12.

In the vibration damper 80 having such a structure, the working air chamber 88 is connected to a negative pressure source such as a negative pressure pump or an intake system during an internal combustion period and the atmosphere through an air line 98. To
It is set so as to be selectively connected and connected via the switching valve 100. If the switching valve 100 is switched to apply a negative pressure and an atmospheric pressure to the working air chamber 88 alternately, the mounting member 14 is attached to the mass member 16 with a change in the pressure of the working air chamber 88. Is applied in the axial direction. Also, the mass member 16
Is vibrated at a cycle corresponding to the switching cycle of the switching valve 100, and therefore, the switching cycle of the switching valve 100 and the magnitude of the air pressure fluctuation vary according to the frequency and amplitude of the vibration of the vibrating body 12 to be damped. By adjusting the length of the vibrating body 1
By applying a vibrating force to 2, the effective vibration damping effect, that is, the vibration suppression effect or the vibration control effect can be obtained. In particular, also in the vibration damper 80 of the present embodiment, as in the first embodiment, in the natural vibration frequency range of the vibration system including the mass member 16 and the supporting rubber elastic body 18, the resonance operation of the vibration system causes A larger excitation force is efficiently generated, and a more excellent vibration damping effect is exhibited.

Further, in particular, in the vibration damper 80 of the present embodiment, since it is not necessary to incorporate an actuator member such as an electromagnetic driving means into the vibration damper 80, the structure is extremely simple, the manufacturing is easy, the weight is small, the size is small, and There is a great advantage that it is inexpensive. Moreover, since the structure is simple, it has excellent durability and reliability, and has an advantage that it is easy to cope with a failure.

Further, in the vibration damper 80 of the present embodiment,
Since the exciting force of the mass member 16 is obtained by using the negative pressure, the negative pressure generated in the intake system and the like can be effectively used particularly in an automobile using an internal combustion engine. There is also an advantage that no special driving energy generating means is required. In the case where compressed air is easily obtained, it is of course possible to vibrate the mass member 16 using positive pressure instead of negative pressure.

The embodiments of the present invention have been described in detail above, but these are merely examples.
The specific description of these embodiments should not be construed as limiting in any way.

For example, in the vibration damper 10 according to the first embodiment, it is possible to support the permanent magnet on the mounting bracket 14 side and support the coil on the mass member 16 side.

In the above embodiment, the lower end portion of the mounting member 14 in the axial direction is slidably inserted into the sliding bush 52 incorporated in the mass member 16, so that the mass member 16 is attached to the mounting member 14. However, a guide mechanism for the mass member by such a fitting is not always necessary.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0040]

As is apparent from the above description, in the vibration damper having the structure according to the present invention, the stopper mechanism for limiting the relative displacement amount of the mass member with respect to the mounting member is provided.
It is configured by using a stopper portion serving as a mounting portion of the supporting rubber elastic body in the mass member, so that a stopper mechanism capable of limiting the displacement amount on both sides in the displacement direction can be realized with a small number of parts and a simple structure. It is realized compactly.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a vibration damper as a first embodiment of the present invention.

FIG. 2 is an explanatory longitudinal sectional view showing a vibration damper as a second embodiment of the present invention.

[Description of Signs] 10,80 Vibration Suppressor 12 Vibrating Body 14 Mounting Bracket 16 Mass Member 18 Support Rubber Elastic Body 20 Coil 22 Permanent Magnet 24 Contact Plate 54 Connecting Bracket 56 Cylindrical Part 56 Upper Flange Part 58 Lower Flange Shape Part 66 Upper buffer rubber layer 68 Lower buffer rubber layer 82 Mass block 88 Working air chamber

Claims (5)

[Claims] 1. A support in which a mounting member fixedly mounted on a vibration damping target and a mass member disposed so as to be relatively displaceable in the vibration input direction with respect to the mounting member are interposed between the two members. In a vibration damper, which is connected by a rubber elastic body and provided with vibration means for applying a vibration force in a vibration input direction between the mass member and the mounting member, Abutting portion extending outwardly is provided at a position separated from the mass member on the vibration damping target side, while straddling the outer peripheral side of the contact portion from the mass member toward the vibration damping target side. While extending cylindrically in the vibration input direction, it is positioned so as to enter between the corresponding contact portion and the opposing surface of the vibration damping target, and the mass member Limit the relative displacement in the vibration input direction with respect to the damping target A vibration damper, comprising: a stopper portion that is provided, and the support rubber elastic body is interposed between the stopper portion and an opposing surface of the mounting member that is orthogonal to a vibration input direction. 2. A cushioning rubber projecting toward the contact portion and the object to be damped, respectively, is formed integrally with the support rubber elastic body on both surfaces of the stopper portion on both sides in the vibration input direction. 2. The vibration damper according to 1. 3. A guide rod extending in the vibration input direction is provided on the mounting member, and the mass member is externally arranged with respect to the guide rod, and the mass member is guided by the guide rod in the vibration input direction. The vibration damper according to claim 1 or 2, wherein the vibration damper is configured to be stiffened. 4. The mass member is formed to include a permanent magnet, and a coil that is disposed in a magnetic field generated by the permanent magnet and generates an electromagnetic force when energized is supported by the contact portion. 4. The vibration damper according to claim 1, wherein said vibration means comprises said permanent magnet and coil. 5. A working air chamber formed between the mounting member and the mass member, a part of a wall portion of the working air chamber is formed of the supporting rubber elastic body, and is sealed from an external space. 5. A vibration damper according to claim 1, wherein said vibration means includes an air passage which is communicated with a chamber and exerts air pressure fluctuation on said working air chamber.