JPH11351321A - Active damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve and stabilize generation efficiency of exciting force and to improve durability by preventing sliding contact between components during operation in an active damper which exerts canceling damping effect by exerting an exciting force to an object to be damped. SOLUTION: A fixed member 12 fixed to a vibration member 34, and a mass member 14 supported by elastic supporting means 16 so as to be displaceable with respect to the vibration member 34 are opposed apart from each other, and a magnetic attraction force or magnetic repulsion force by electromagnet means 18 is exerted on the fixed member 12 and the mass member 14, thereby relatively displacing the mass member 14 with respect to the fixed member 12 in a direction of approaching/leaving the fixed member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damper for reducing vibration in an object to be damped, and more particularly, to a vibration member such as an object to be damped and a member for transmitting vibration to the object to be damped. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active vibration damper which suppresses vibration by applying a vibration force.

[0002]

2. Description of the Related Art As a means for reducing the vibration of a vibration damping object such as a car body in which vibration is a problem, for example, JP-A-3-292219 and JP-A-6-235438. Etc., as described in
There has been proposed a vibration damper that actively suppresses vibration by applying a vibrating force corresponding to vibration to be damped to a vibration member such as a vibration damping target or a vibration transmission member thereof.

In such a conventional vibration damper, as described in the above-mentioned publication, a closed magnetic path composed of a permanent magnet is generally divided to form a magnetic gap, and a coil is formed in the magnetic gap. And a voice coil type electromagnetic driving means for relatively displacing the permanent magnet and the coil based on an electromagnetic force or Lorentz force acting between the magnetic field of the permanent magnet and the coil current is employed. Then, one of the permanent magnet and the coil is fixed to the vibrating member, and the other is elastically supported to form a single-vibration system. The resonance action of the vibration system is used to generate a vibration between the permanent magnet and the coil. The reaction force due to the electromagnetic force
The vibrating member is efficiently applied as a vibrating force.

However, in such a conventional vibration damper, the gap between the surface facing the magnetic gap and the coil is sufficiently increased in order to increase the magnetic flux density in the area where the coil is disposed and efficiently obtain the exciting force. Since it is necessary to make the coil narrower, the coil is likely to come into contact with the surface facing the magnetic gap at the time of excitation, and abnormal noise and malfunction due to contact, energy loss, component deterioration, etc. are likely to cause problems. There was a problem that it was difficult to ensure durability. In addition, if the number of turns of the coil is increased to obtain a large excitation force, the radial thickness of the coil increases, and the distance between the opposing surfaces of the magnetic gap (the size of the magnetic gap) also needs to be increased. Accordingly, there is also a problem that it is difficult to efficiently obtain a large excitation force because a reduction in magnetic flux density in the coil arrangement region is inevitable.

[0005]

Here, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to avoid noise between members by avoiding contact between members. An object of the present invention is to provide an active vibration damper having a vibration generating force mechanism of a novel structure, which can efficiently obtain a stable vibration force without exerting the same and exhibit excellent durability. .

[0006]

Here, the present invention has been made in view of the above-mentioned circumstances, and is characterized by (a) a fixing member fixedly attached to a vibration member; (B) a mass member disposed to face the fixed member so as to be spaced in one direction, (c) elastic supporting means for elastically displacing the mass member with respect to the vibration member, and (d). A magnetic operating portion provided on one side of the fixed member and the mass member to which a displacement force is exerted by a magnetic field; and (e) a magnetic operating portion provided on the other side of the fixed member and the mass member And an electromagnet means for changing a magnetic field applied to the mass member, and the mass member is driven to vibrate in a direction of approaching / separating from the fixed member by energizing the electromagnet means.

In such an active vibration damper having a structure according to the present invention, a magnetic force (magnetic attractive force or repulsive force) applied between the electromagnet means and the magnetic action portion.
Is exerted on the fixed member and the mass member as a driving force for displacing both members in the approaching / separating direction. Then, when the magnetic field applied to the magnetic action portion by energizing the electromagnet means, that is, the polarity or the magnetic intensity is changed, the driving force (relative displacement force) applied between the fixed member and the mass member is changed. Thereby, a relative repetitive displacement force in the facing direction is exerted on the fixed member and the mass member, and the mass member is elastically supported by the elastic support means, thereby forming a single vibration system. Therefore, based on the resonance characteristics of the vibration system, the excitation force is effectively exerted on the vibration member as a reaction force of the repeated displacement force between the fixed member and the mass member.

In such an active vibration damper,
The fixed member and the mass member are relatively displaced in the approaching / separating direction based on the attraction or repulsion of the magnetic force between the magnetic acting portion and the electromagnet means in the fixed member and the mass member which are spaced apart and opposed to each other. Therefore, mutual sliding contact between the members during the operation is avoided. Therefore, output loss and operation instability due to sliding contact and the like are avoided, and excellent durability is exhibited.

Moreover, in such an active vibration damper, the magnetic field applied to the magnetic operating portion is increased by increasing the number of coil windings in the electromagnet means, and is applied between the magnetic operating portion and the electromagnet means. The magnetic force, and thus the relative displacement force exerted between the fixed member and the mass member, can be efficiently increased, and thus a large excitation force can be easily obtained.

In the present invention, the material and shape of the fixing member and the mass member are not particularly limited, but the fixing member may be provided with any one of the magnetic action portion and the electromagnet means. Also, it is desirable that at least a portion facing the mass member is formed of a ferromagnetic material or a permanent magnet so that a magnetic force between the magnetic action portion and the electromagnet means can be efficiently obtained. In addition, regardless of whether the magnetic member or the electromagnet means is provided on the mass member, at least the mass member opposes the fixed member so that the magnetic force between the magnetic action portion and the electromagnet means can be efficiently obtained. It is desirable that the portion is formed of a ferromagnetic material or a permanent magnet, and furthermore, a low-priced high-specific-gravity material, such as one made of an iron-based metal, is preferably used so that the mass is secured in a compact size. Adopted. Furthermore, in the present invention, the magnetic action portion can be formed of a ferromagnetic material or a permanent magnet so that a magnetic force of attraction or repulsion is exerted by the action of a magnetic field exerted by the electromagnet means. Further, the electromagnet means can adopt, for example, a hollow coil structure.However, in order to obtain an efficient magnetic field, a coil wound in a large number in the circumferential direction is inserted through a hollow hole of the coil. It is desirable to include a ferromagnetic material such as an iron core so that a magnetic pole can be applied to the axial end face of the iron core by energizing the coil. Alternatively, as such electromagnet means, a permanent magnet is disposed in the hollow hole of the coil, and by energizing the coil,
It is also possible to increase or decrease or change the magnetic field generated by the permanent magnet. Furthermore, in order to obtain a more efficient magnetic force, it is desirable that the magnetic action portion and the magnetic pole surface of the electromagnet means be directly opposed to each other on the opposed surface of the fixed member and the mass member. In the present invention, the elastic support means may be constituted by using an elastic member such as a rubber elastic body or a metal spring such as a coil type or a plate type alone or in combination. A part of the wall portion is formed to constitute a fluid chamber in which an incompressible fluid is sealed, and the wall property of the fluid chamber is utilized, and a spring characteristic based on fluid flow in the fluid chamber is utilized. By elastically supporting the mass member with respect to the vibrating member, the elastic supporting means can be formed.

In the present invention, the fixing member and the mass member may be independently attached to the vibration member using separately formed brackets or the like. For example, a bracket attached to the vibration member may be used. , The fixing member is fixed to the bracket, and the mass member is supported by the bracket via elastic supporting means. If such a bracket is adopted, the fixing member and the mass member can be easily attached to the vibration member by one bracket.
In addition, since the fixing member and the mass member are integrated by the bracket, there is an advantage that transportation, stocking, and the like of the product, the vibration damper, are facilitated.

The bracket is desirably made of metal having sufficient rigidity, and its specific shape and the like are not limited. For example, the bracket is provided with a cylindrical portion and one of the cylindrical portions in the axial direction is provided. While the fixing member is fixed to the end, a supporting rubber elastic body is inserted and arranged at the other axial end of the cylindrical portion, and the outer peripheral edge of the supporting rubber elastic body is fixed to the cylindrical portion, and the supporting rubber elastic body is fixed. A configuration in which a mass member is housed and arranged in the hollow interior of the bracket, and the mass member is fixed to a substantially central portion of the elastic rubber member and elastically supported is suitably adopted. By adopting such a configuration, a space for disposing the fixing rubber member, the mass member, and the supporting rubber elastic body as elastic supporting means is advantageously secured in a compact size, and the volume of the supporting rubber elastic body is also advantageously reduced. Can be secured. In addition, since the displacement region of the mass member is covered with the bracket, intrusion of foreign matter, interference with other members, and the like are advantageously avoided. In addition, the support rubber elastic body is mainly subjected to shear deformation in the approaching / separating direction of the mass member with respect to the fixed member, whereas the supporting rubber elastic body undergoes compression / tensile deformation in the displacement direction of the mass member perpendicular thereto, so that the tuning of the spring characteristic is performed. In addition to being easy, unstable displacement such as blurring of the mass member can be suppressed, and the operation can be further stabilized.

In the active vibration damper having the structure according to the present invention, at least one of the opposing surfaces of the mass member and the fixing member prevents the mass member and the fixing member from abutting. It is desirable to provide stopper means.
Adopting such stopper means effectively prevents magnetic contact between the mass member and the fixed member or attracts the member, thereby generating abnormal noise or damage to the member due to the contact between the two members. Are advantageously avoided. The stopper means is, for example, fixedly provided with a cushion rubber that extends continuously or discontinuously in an annular shape on the opposing surface of the mass member or the fixing member, protrudes in the opposing direction, and is compressed and deformed by contact. And so on.

Further, in the active vibration damper having a structure according to the present invention, for example, at least one of the opposing surfaces of the fixed member and the mass member is constituted by a magnetic operating portion or an electromagnet means, and The magnetic force acting surface that exerts a magnetic force on the mass member has a ring shape extending around a central axis extending in the displacement direction of the mass member, or a plurality of such surfaces are independently set around the central axis extending in the displacement direction of the mass member. Such a configuration can be advantageously employed. By employing such a ring-shaped magnetic force acting surface or a plurality of magnetic force acting surfaces, it is possible to stabilize the displacement of the mass member while avoiding sliding contact between the members.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION 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
Is provided with a yoke 12 as a fixing member and a mass metal member 14 as a mass member, which are spaced apart and opposed to each other, and the mass metal member 14 is elastically supported by a rubber elastic body 16 as elastic support means. By controlling the energization of the coil 18 which is mounted on the yoke 12 and constitutes the electromagnet means, a magnetic force is exerted between the yoke 12 and the mass metal fitting 14, and the mass metal fitting 14 approaches / separates from the yoke 12. Reciprocating in the direction.

More specifically, the yoke 12 is formed of a ferromagnetic material such as iron, and has a circular cross-section core that protrudes axially upward from a central portion of the thin disk-shaped substrate 20. The part 22 has a shape integrally formed. The coil 1 is wound around and covered by bobbins 24a and 24b made of an insulating material such as a synthetic resin.
8 is assembled in an extrapolated state. In addition, yoke 1
A cylindrical caulking member 26 extending upward in the axial direction is externally fixed to the second substrate portion 20. And
The outer peripheral surface of the coil 18 is covered with the caulking metal fitting 26, and the upper opening of the caulking metal fitting 26 is bent inward and overlapped on the upper end surface of the coil 18, so that the coil 18 12 is fixed. The caulking fitting 26 is desirably a non-magnetic material.

The iron core portion 22 of the yoke 12 projects axially above the coil 18, and its upper end surface 29 is a substantially flat surface extending in a direction perpendicular to the axis. The outer peripheral surface of the upper end portion of the iron core portion 22 is
The inner peripheral surface of the inner bent portion 28 of the coil 6 is radially separated from and opposed to the inner peripheral surface of the coil 18 in the axial direction. A cushioning rubber 30 as stopper means extending continuously in the circumferential direction with an annular plate shape is fitted between the iron core portion 22 and the radially opposed surfaces of the caulking fitting 26 (inwardly bent portion 28). The coil 18 (bobbin 2
4), the core portion 22 of the yoke 12 is bonded.
It is fixedly attached so as to protrude upward in the axial direction.

Further, on the lower end surface of the yoke 12, a mounting plate 32 is overlapped and fixed by welding or the like. Then, the yoke 12 is fixed to the vibration member 32 by attaching the mounting plate 32 to the vibration member 34 to be damped by a bolt 36 as fixing means. The mounting plate 32 has a generally inverted dish shape with its central portion raised, and its outer peripheral edge is overlapped with the vibrating member 34 and fixed by bolts. The power supply lead wire 38 to the coil 18 is drawn out by utilizing the gap formed therebetween.

A cylindrical fitting 40 having a large diameter is externally inserted into the swaging fitting 26 fixed to the yoke 12.
It is fixed by press fitting or welding. This mounting cylinder fitting 40
Is sandwiched by a step 42 provided at an intermediate portion in the axial direction,
It has a stepped cylindrical shape in which the lower part in the axial direction is a small diameter part 44 and the upper part in the axial direction is a large diameter part 46. The small-diameter portion 44 is extrapolated and fixed to the metal fitting 26 so that the large-diameter portion 4 is fixed.
6 protrudes greatly upward from the yoke 12 in the axial direction, and is opened.

The large-diameter portion 46 of the mounting sleeve 40
A rubber elastic body 16 is attached to the opening on the side.
The rubber elastic body 16 has a substantially thick annular plate shape, and its thickness is gradually increased inward in the radial direction in consideration of stress distribution and the like. A cylindrical fitting metal fitting 48 is vulcanized and bonded to the outer peripheral surface of the rubber elastic body 16, and a cylindrical supporting cylindrical metal fitting 50 is vulcanized and bonded to the inner peripheral surface of the rubber elastic body 16. I have. In short, in this embodiment, the large-diameter cylindrical fittings 48 are coaxially arranged apart from each other in the radial direction of the small-diameter cylindrical supporting cylindrical fitting 50. A thick rubber elastic body 16 having a substantially annular plate shape is interposed between the radially opposed surfaces of the fitting 48 and the fitting 48.
6 is formed as an integrally vulcanized molded product including the support tube fitting 50 and the fitting fitting 48. Then, the fitting 48 is fixed to the opening on the large-diameter portion 46 side of the mounting cylinder 40 by press fitting or the like, so that the rubber elastic body 16 covers the upper opening in the axial direction of the mounting cylinder 40. Then, it is assembled to the mounting cylinder fitting 40.

Further, in the hollow interior of the mounting cylinder fitting 40,
A mass metal fitting 14 is accommodated and arranged between the yoke 12 fixed to each of the upper and lower ends in the axial direction and the facing surface of the rubber elastic body 16. The lower end of the support cylinder 50 in the axial direction protrudes below the rubber elastic body 16 in the axial direction, and the mass metal 14 is overlapped on the lower end of the support cylinder 50. Then, the center hole 52 of the support cylinder fitting 50 is formed.
By the connecting bolt 54 which is a fixing means inserted through the
The mass metal fitting 14 is fixed to the support cylinder metal fitting 50.

The mass metal fitting 14 is formed of a ferromagnetic material such as iron, has a circular block shape, and is disposed on the substantially same central axis as the mounting cylinder metal fitting 40 in the hollow inside of the mounting cylinder metal fitting 40. Then, it is bolted to the support cylinder fitting 50 on its central axis. The outer diameter of the mass metal fitting 14 is smaller than the inner diameter of the mounting cylinder metal fitting 40, and the axial dimension of the mass metal fitting 14 is
2 and the distance between the opposing surfaces of the rubber elastic body 16 in the axial direction, that is, in this embodiment, the distance between the upper end surface of the cushioning rubber 30 provided on the yoke 12 side and the lower end surface of the support cylinder fitting 50 fixed to the rubber elastic body 16. The distance between them is smaller.

In this manner, the mass metal fitting 14 is allowed to reciprocate in the axial direction based on the elastic deformation of the rubber elastic body 16 in the above-described mounted state, and is prevented from interfering with the mounting cylinder metal fitting 40. It has become so. The axial lower end surface 56 of the mass metal fitting 14 is a flat surface that extends in a direction substantially perpendicular to the axis of the mounting cylinder metal fitting 40, and this mass lower end surface 56 is the upper end surface 29 of the iron core 22 in the yoke 12.
And is opposed to the iron core upper end surface 29 in the axial direction. In short, the mass metal fitting 14 is composed of the rubber elastic body 16 and the mounting cylinder metal fitting 4.
0 and the mounting plate 32 to be attached to the vibration member 34.
Based on the elasticity of the vibration member 34, the vibration member 34 is elastically supported. Further, as is apparent from this, in the present embodiment, the mounting plate metal fitting 32 and the mounting cylindrical metal fitting 40 secure the yoke 12 and the vibration member 34 to each other, and also attach the mass metal fitting 14 to the vibration member via the rubber elastic body 16. A bracket to be supported by 34 is formed.

Then, the vibration damper 1 having such a structure is provided.
0 indicates that the central axis (the central axis of the yoke 12 and the mass metal fitting 14) is the vibration direction of the vibration to be prevented by the vibrating member 34, and the yoke 12 and the mass metal fitting 14 are opposed to each other in such a direction. , Attached to the vibration member 34. Further, desirably, in order to reduce or avoid an adverse effect due to gravity, the vibration damper 10 is mounted so that the central axis thereof is substantially vertical.

When the coil 18 is energized in such a mounted state, both magnetic poles are formed on the upper and lower end surfaces in the axial direction of the yoke 12, so that the upper end surface 29 of the core portion 22 of the yoke 12 is formed.
Are provided with magnetic poles. When the magnetic field of the magnetic poles is applied to the mass metal fitting 14, a magnetic force acts between the upper end surface 29 of the yoke 12 and the lower end surface 56 of the mass metal fitting 14, and a relative force is generated between the yoke 12 and the mass metal fitting 14. A magnetic attraction is exerted. As a result, the mass metal fitting 14 is relatively displaced in the axial direction toward the yoke 12 with the elastic deformation of the rubber elastic body 16. The magnetic attraction force (relative displacement force) exerted between the yoke 12 and the mass metal fitting 14 varies depending on the strength (magnetic force) of the magnetic pole generated in the yoke 12, that is, according to the magnitude of the current in the coil 18. I'm sullen.

Therefore, if the current supplied to the coil 18 is changed by supplying a pulse wave current, a pulsed current, an alternating current, or the like to the coil 18, the mass metal fitting 14 moves closer to the yoke 12. Reciprocating displacement (vibration) in the separation direction. Moreover, the magnitude (amplitude), frequency, and phase angle of the vibration can all be adjusted by the magnitude, frequency, and phase angle of the current flowing through the coil 18. In particular, since the mass metal fitting 14 is elastically supported by the vibration member 34 via the rubber elastic body 16 to form one vibration system, the mass metal fitting 14 is formed by utilizing the resonance action of the vibration system. The reaction force of the displacement drive of the fourteen yokes 12 can be effectively exerted on the vibration member 34 as a vibration force on the vibration member 34.

Accordingly, a current corresponding to the vibration of the vibration member 34 to be damped is supplied to the coil 18 and the generated excitation force is applied to the vibration member 34, so that the vibration in the vibration member 34 is activated or canceled out. It can be suppressed to. The power supply control to the coil 18 is performed by, for example, a control device that adjusts the excitation force having the same frequency as the vibration to be damped in the vibration member 34 so that the vibration force can be exerted on the vibration member 34 by controlling the phase. . More specifically, as such a control device, for example, when a body of an automobile is used as the vibration member 34, a signal obtained by directly detecting vibration of the vibration member 34 using an acceleration sensor or the like, or a signal of the vibration member 34 The energization of the coil 18 is controlled using general feedback control such as PI control or adaptive control so as to reduce the vibration of the vibration member 34 by employing an engine rotation signal or the like correlated with the vibration as a reference signal. And the like can be employed.

In this embodiment, no matter whether the magnetic pole on the yoke 12 side is the N pole or the S pole, a magnetic attraction is exerted on the mass metal fitting 14, so that an alternating current is supplied to the coil 18. In this case, an exciting force having a frequency twice the energizing frequency is generated. Therefore, when the alternating current is supplied, the energization of the coil 18 is controlled at a frequency half the required exciting force.

Here, in the vibration damper 10 having the above-described structure, the mass metal fitting 14 is moved to the yoke 12 by the magnetic force of the electromagnet including the coil 18 and the yoke 12.
Is vibrated in the approaching / separating direction with respect to the member, so that mutual sliding contact between the members can be advantageously avoided during the operation. Therefore, the desired excitation force can be efficiently obtained without causing a problem of a decrease in output efficiency or unstable operation due to sliding contact between the members, and an excellent anti-vibration effect. Is stably exhibited, and excellent durability is exhibited by avoiding wear and the like of the member.

In the present embodiment, the mass metal fitting 14 is disposed between the opposing surfaces of the yoke 12 and the rubber elastic body 16, and the central portion of the mass metal fitting 14 is supported by the central portion of the rubber elastic body 16. The inner diameter of the rubber elastic body 16 is
Since the outer diameter of the rubber elastic body 16 is set smaller than the outer diameter of the rubber elastic body 16, the volume of the rubber elastic body 16 can be advantageously secured without increasing the outer diameter of the rubber elastic body 16 so much with respect to the mass metal fitting 14. This is advantageous in that the vibration damper 10 can be made compact while sufficiently ensuring the tuning range of the support spring characteristics of the mass metal fitting 14 and the durability of the rubber elastic body 16.

Further, in this embodiment, the displacement area of the mass metal fitting 14 including the space between the magnetic metal working surface of the mass metal fitting 14 and the yoke 12 is separated from the external space by the mounting cylinder metal fitting 40 and the rubber elastic body 16. Therefore, malfunction or damage due to intrusion of foreign matter or the like can be prevented.

Next, FIG. 2 shows a vibration damper 60 according to a second embodiment of the present invention. The vibration damper 60 shows another configuration example of the magnetic pole portion on the yoke 12 side. Members and portions having the same structure as that of the first embodiment are respectively shown in the drawing. The same reference numerals as in the first embodiment denote the same parts, and a detailed description thereof will be omitted.

That is, in the vibration damper 60 of the present embodiment, the core 2 of the yoke 12 made of a ferromagnetic material is used.
The two protruding end portions are constituted by permanent magnets 62. The permanent magnet 62 is a permanent magnet made of a known magnet material such as alnico, ferrite, and rare earth magnet, and has both magnetic poles (N pole and S pole) on both axial sides of the iron core 22. .

In the vibration damper 60 having such a structure, even when the coil 18 is not energized, the permanent magnet 62
Due to the magnetic field generated by
A magnetic attraction force is applied to the yoke 12 side, and the mass metal fitting 1
4 is positioned and held at a position close to the mass metal fitting 14 by a predetermined amount against the elastic force of the rubber elastic body 16. The magnetic force exerted on the mass fitting 14 is changed by the permanent magnet 62 mounted on the side, and the mass fitting 14 is vibrated and displaced toward and away from the yoke 12. Therefore, the same effects as those of the first embodiment can be effectively exhibited.

In this embodiment, in particular, in the present embodiment, the magnetic pole applied to the distal end of the yoke 12 by energizing the coil 18 has one magnetic pole (shown in FIG. In the structure, it is in a state of being biased to the N pole) side. Therefore, the elastic force of the rubber elastic body 16 can be used more effectively, and the magnitude (amplitude) of the current (amplitude) so that the coil 18 has a magnetic strength that does not reverse the magnetic pole of the permanent magnet 62, for example. ), Even if an alternating current is supplied to the coil 18, the mass metal fitting 1 has the same frequency as the frequency of the alternating current.
Since the vibrating member 4 is vibrated and displaced, it becomes possible to apply a vibrating force having the same frequency as the alternating current supplied to the coil 18 to the vibrating member 34.

The embodiments of the present invention have been described in detail above, but these are literal examples.
By the specific description of such an embodiment,
It is not to be construed as limiting.

For example, the shape, size and the like of the mass metal fitting 12 and the rubber elastic body 16 are appropriately changed depending on the frequency and size of the vibration to be damped, and are not limited. Not something.

Further, instead of or in addition to the rubber elastic body 16 for elastically supporting the mass metal fitting 14,
The mass metal fitting 14 and the mounting cylinder metal fitting 40 extend over the radially opposed surfaces of the outer peripheral surface of the mass metal fitting 14 and the inner peripheral surface of the mounting cylinder metal fitting 40.
It is also possible to provide a second rubber elastic body for elastically connecting the rubber elastic members in the radial direction. If such a second rubber elastic body is provided, it is possible to more advantageously prevent the displacement and the like of the mass metal fitting 14 in the direction perpendicular to the axis.

Furthermore, the mass metal fitting 14 only needs to be formed of a ferromagnetic material at a portion facing the magnetic pole surface (upper end face) 29 of the yoke 12, and it is not necessary to form the entire mass metal fitting 14 with a ferromagnetic material. Absent. Further, instead of disposing the permanent magnet 62 on the magnetic path generated by the coil 18 on the yoke 12 side, as in the vibration damper 60 according to the second embodiment, or in addition to the permanent magnet 62, a mass metal fitting is provided. A permanent magnet is mounted on the 14 side, and the lower end surface 56 of the mass metal fitting 14 located opposite the magnetic pole surface (upper end surface) 29 of the yoke 12.
It is also possible to set the magnetic poles in.

Further, it is also possible to provide a magnet or the like by mounting a coil or the like on the mass metal fitting 14 side. When the electromagnet means is provided on the side of the mass metal fitting 14, the yoke 12
There is no need to provide electromagnet means on the side, and the surface of the yoke 12 facing the mass fitting 14 can be made of a ferromagnetic material, a permanent magnet, or the like.

Further, the mounting plate 32 fixed to the yoke 12 and the mounting tube 40 for supporting the mass metal 14 are formed separately from each other without being fixed to each other. May be independently attached to the same portion or different portions of the vibration member 34.

Further, the vibration dampers 10, 60 as described above
Is provided with a single vibration system using the mass metal fitting 14 and the rubber elastic body 16 as a mass system and a spring system. Therefore, when the coil 18 is not energized, dynamic vibration absorption utilizing the resonance phenomenon of the vibration system is provided. It is, of course, possible to use it as a vessel (dynamic damper).

Further, in the above embodiment, the mass metal fitting 14
The magnetic force acting surface which mutually exerts a magnetic force between the yoke 12 and
Each of them has a flat circular surface extending around the central axis of the mass metal fitting 14. However, for example, as shown in FIG. 12 has a sufficiently large diameter, and the upper end surface 70 in the axial direction is protruded upward in the axial direction only in the outer peripheral portion, thereby expanding in an annular shape around the central axis of the mass metal fitting 14. A flat ring shape is also possible. A circular block-shaped cushion rubber 30 is fitted into a circular recess formed at the center of the upper end surface of the iron core portion 22 as shown in the figure, and protrudes from the mass metal fitting 14 side. As shown in FIG. 4, the plurality of iron cores 72 projecting toward the mass metal fittings 14 on the yoke 12 are respectively connected to the mass metal fittings 14.
Are arranged on the circumference centered on the center axis of each of the metal core parts 72, and the coils 74 are attached to the respective iron core portions 72, so that a plurality (for example, (Two or more) magnetic force acting surfaces 76 may be formed. By adopting such a configuration shown in FIG. 3 or 4, it is possible to improve the stability of the magnetic force exerted on the mass metal fitting 14 and the stability of the displacement of the mass metal fitting 14 without involving sliding between the members. It becomes possible. In the vibration dampers according to the third and fourth embodiments as shown in FIGS. 3 and 4, the vibration dampers according to the first embodiment are described in order to facilitate understanding. In the drawings, members and portions having the same structure as those described above are denoted by the same reference numerals as in the first embodiment.

In addition, the present invention is advantageously applied to a vibration damper for reducing vibration of various members such as a body and a muffler of an automobile or a vibration damping object of various devices other than an automobile. Can be done.

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.

[0047]

As is apparent from the above description, in the active vibration damper having the structure according to the present invention, the magnetic attraction force and the repulsive force generated between the electromagnet means and the magnetic action portion cause the vibration. Since the mass member is relatively displaced in the approaching / separating direction with respect to the fixed member, and the vibrating member is subjected to a vibrating force as a reaction force, the mutual sliding contact between the members during operation is advantageously avoided. Can be done. Therefore, output loss and operation instability caused by sliding contact between the members and the like are prevented, and a stable excitation force can be efficiently obtained, and the vibration suppression effect can be improved and stabilized. Any improvement in durability is advantageously achieved.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory longitudinal sectional view showing a vibrator as a third embodiment of the present invention.

FIG. 4 is an explanatory longitudinal sectional view showing a vibrator as a fourth embodiment of the present invention.

[Explanation of symbols]

 10, 60 Vibration suppressor 12 Yoke 14 Mass fitting 16 Rubber elastic body 18 Coil 34 Vibrating member

Claims (4)

[Claims] A fixing member fixedly attached to the vibration member; a mass member disposed to be opposed to the fixing member in one direction so as to be spaced apart from the fixing member; Resilient support means for supporting the fixed member and the mass member, wherein the magnetic member is provided on one side of the fixed member and the mass member and is subjected to a displacement force by a magnetic field; and And electromagnet means for changing the magnetic field applied to the magnetic action portion, which is provided on one of the other sides, and energizing the electromagnet means to apply the mass member in a direction approaching / separating from the fixed member. An active vibration damper characterized by being driven to vibrate. 2. A bracket attached to the vibration member, wherein the fixing member is fixed to the bracket, and the mass member is supported by the bracket via the elastic supporting means. 4. The active vibration damper according to claim 1. 3. A tubular portion is provided on the bracket, and the fixing member is fixed to one axial end of the tubular portion.
The support rubber elastic body is inserted and arranged at the other end in the axial direction of the cylindrical part, the outer peripheral edge of the support rubber elastic body is fixed to the cylindrical part, and the mass member is provided inside the hollow of the bracket. 3. The active vibration damper according to claim 2, wherein the mass member is accommodated and arranged, and the mass member is fixed to a substantially central portion of the elastic rubber member and elastically supported. 4. A stopper according to claim 1, wherein at least one of the opposing surfaces of said mass member and said fixed member is provided with stopper means for buffering the contact between said mass member and said fixed member. 4. The active vibration damper according to claim 1.