JPH10272910A - Vibration controlling suspension member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reduce noise such as road noise and vibration inside a cabin in all corners of it through a simplified structure. SOLUTION: Noticing not the vibration and noise inside a cabin that may give rise to public discussion but the vibration on the vibration transfer route which is the causing side of such noise, an excitation means 46 is provided on a rigid suspension member 10 composing such vibration transfer route and the vibration of the rigid suspension member 10 is offsettedly restrained. Thus vibration transfer force, which is the cause of vibration and noise inside the cabin, from the wheel side to the body side is actively and positively reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid suspension member interposed between a body and a wheel of an automobile to form a suspension, and in particular, to efficiently transmit vibration transmitted from a wheel to a body through the suspension. The present invention relates to an anti-vibration suspension member having a novel structure, which is advantageously reduced to improve the ride comfort and quietness of a vehicle.

[0002]

2. Description of the Related Art Vibration and noise in the interior of a vehicle are factors that greatly affect the quality of riding comfort. One of such vibrations and noise in the interior of a vehicle is to connect a body and a wheel, such as node noise. Some vibrations are caused by transmission of vibration from the wheel side to the body side through a suspension device that supports the vehicle body. Particularly in recent years, with the quieter power units and higher performance tires (low profile), vibrations and noise caused by vibrations transmitted from the wheel side to the body side through the suspension device have become a serious problem. It is becoming.

Therefore, conventionally, vibration isolation is achieved by interposing a vibration isolator such as a rubber bush at a connection portion of a suspension member constituting a suspension device.
If the spring constant of the rubber bush is too small, the steering stability of the vehicle may be impaired.Therefore, it is extremely difficult to obtain sufficient vibration damping performance. It was difficult to obtain an effective anti-vibration effect.

[0004] In order to deal with such a problem,
2. Description of the Related Art A technology has been developed in which a speaker is mounted in a vehicle interior, and a sound wave having a phase opposite to that of the problematic noise is generated from the speaker and superimposed to reduce the noise. However, although such a method is effective in lowering the sound pressure level in a very narrow space, there is a problem that it is unavoidable to increase the sound pressure level in other places and increase the total noise power. If noise is to be reduced over the entire cabin, a large number of sensors and speakers are required, the device becomes large and complicated, and the control system becomes extremely complicated, which is not practical. . Moreover, such a method has a problem that it is extremely difficult to obtain an effective reduction effect on the vibration in the passenger compartment.

[0005]

Here, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to solve the problem, such as road noise, from the wheel side through the suspension device to the body side. It is an object of the present invention to provide a novel anti-vibration technique that can effectively reduce vibration and noise in a vehicle cabin due to vibration transmission to a vehicle with a simple configuration.

[0006]

In order to solve such a problem, a feature of the invention according to claim 1 is that a rigid suspension which is interposed between a body and a wheel of an automobile to form a suspension device. In the member, a vibration means for applying a vibration force in the vibration transmission direction and capable of controlling the frequency of the generated vibration force is installed, and the vibration is actively reduced by the vibration force exerted by the vibration means. The suspension member for vibration isolation as described above.

That is, conventionally, in order to reduce the vibration and noise such as road noise caused by the transmission of vibration from the wheel side to the body side, the output portion where the vibration and noise are actually generated is exclusively used. The invention according to claim 1, which has been dealt with in the vehicle interior, completely changes the viewpoint from such a conventional one and copes with it on the vibration transmission path, thereby transmitting vibration to the body side. It is based on a new technical idea of reducing the above.

In the vibration-damping suspension member having the structure according to the first aspect of the present invention, the vibration of the rigid suspension member itself constituting the suspension device is offset by the vibration means. Therefore, the vibration transmitting force to the body side is advantageously reduced as a whole, and therefore, vibration and noise are advantageously suppressed in the entire vehicle interior. Moreover, since the number of rigid suspension members is limited, vibration and noise in the entire vehicle cabin can be effectively suppressed by a simple configuration in which one or more of the rigid suspension members are provided with vibration means. You can. In addition, since vibration can be canceled in a wide frequency range as compared with the case where the sound wave is canceled by a speaker or the like, it is possible to obtain an effective reduction effect on vibration and noise in a wide frequency range. There are advantages too.

The rigid suspension member on which the vibrating means is mounted is not particularly limited, and is determined in consideration of the magnitude of the vibration transmitting force and the noise and vibration of the cabin, which is a problem. Become. Here, as set forth in claim 2, at least one vibration isolation rubber is disposed on a connection path between the body and the wheel in the suspension including the rigid suspension member to which the vibration means is attached. It is desirable. When the vibration isolating rubber is provided in this manner, the vibration energy of the rigid suspension member is reduced by the vibration isolating rubber, so that the vibration of the suspension member can be advantageously and easily suppressed by the vibration means. As a result, it is possible to obtain a more excellent anti-vibration effect.

[0010] Specifically, it is possible to attach a vibrating means to a suspension arm such as an A-type arm or an I-type arm or a suspension rod such as a strut rod or a control rod. If the vibration means is mounted on the vibration source, vibration can be actively suppressed at a portion near the vibration input source. Also, it is possible to attach a vibration means to a suspension sub-member (sub-frame) or the like, whereby vibrations transmitted through a plurality of arms or the like can be collectively suppressed, and at the same time, Since the vibration energy itself is sufficiently reduced by a rubber bush or the like interposed at a connection portion between the arm and the wheel, the vibration can be more easily suppressed. Further, it is also possible to attach a vibration means to the shock absorber, the damper rod, and the like, thereby directly from the wheel side to the body side through the shock absorber, the damper rod, etc., without passing through the sub-member, etc. It is possible to obtain an effective reduction effect even for a vibration that is input in a random manner.

Further, as the vibrating means, a means capable of controlling the frequency of the vibrating force is used in order to effectively obtain a desired vibration damping effect, but the specific structure is not particularly limited. Not something. For example, as described in claim 3, an electromagnetic type vibrating means for generating a vibrating force based on a magnetic force or an electromagnetic force generated by energizing the coil can be suitably adopted as the vibrating means. Further, as described in claim 4, a vibrating means configured by assembling the electrostrictive element which expands and contracts by a change in the electric field in advance in the deformation direction and is assembled is also preferably employed. obtain. In addition, it is also possible to employ a vibrating means or the like configured by assembling a magnetostrictive element that expands and contracts due to a change in the magnetic field in a deformation direction in advance.

By employing such an electromagnetic vibrating means or vibrating means comprising an electrostrictive element, it is possible to easily control the vibrating force and the frequency and to have excellent responsiveness. Therefore, the vibration canceling effect can be advantageously and stably obtained. In particular, if the electromagnetic vibration means is adopted, a large vibration stroke can be easily secured, and if the vibration means composed of the electrostrictive element is employed, a large vibration force and extremely large vibration force can be obtained. Excellent responsiveness can be easily secured.

Further, the mounting position and mounting structure of the vibrating means to the suspension member are not particularly limited, and the shape and arrangement space of the suspension member and the vibration form to be damped are taken into consideration. It will be determined appropriately. For example, as described in claim 5,
It is also possible to mount such a vibration means inside the rigid suspension member in a housed state. According to the fifth aspect of the present invention, a space for mounting the vibration means can be efficiently secured, and the vibration member can be disposed on the center axis of the suspension member. An exciting force in a specific direction can be advantageously exerted on the suspension member.

It is, of course, possible to mount the vibration means displaced from the central axis of the suspension member, or to mount the vibration means outside the suspension member.
Since an exciting force can be applied to the suspension member not only in the axial direction but also in the bending direction, it is possible to obtain an effect of suppressing vibrations in a plurality of directions by one exciting means.

In addition, it is of course possible to directly transmit the vibrating force generated by the vibrating means to the rigid suspension member so that the vibrating force acts on the rigid suspension member. In this way, at least one of the output member on the working side and the output member on the reaction side of the vibrating force of the vibrating means is elastically attached by the support spring member to constitute at least one vibration system. Vibration may be applied to the rigid suspension member via the vibration system. By applying the exciting force via the vibration system in this way, it is possible to obtain a more effective vibration damping effect by applying a larger exciting force to the suspension member by utilizing the resonance action of the vibration system. You can. Further, in particular, when two substantially independent vibration systems are constituted by the operation-side output member and the reaction-side output member, by setting the natural frequencies of the respective vibration systems to mutually different frequency ranges, the vibration system can be controlled. The effect of improving the vibration isolation performance based on the resonance action can be obtained for vibrations in a plurality of or wide frequency ranges.

Further, in order to advantageously obtain an active vibration reduction effect by vibrating force exerted by the vibrating means, for example, it is necessary to cope with vibration transmitted to the body side. A control device that controls the operation of the vibrating means based on the reference signal so as to reduce the vibration by using the signal obtained as a reference signal is preferably employed. The reference signal corresponding to the vibration transmitted to the body includes, for example, a vibration detection signal of a suspension member to which the vibration means is attached, a vibration detection signal of another suspension member, and vibration and noise in the vehicle interior. Can be adopted. In addition, as a control method based on the reference vibration, adaptive control or the like is suitably adopted in addition to general feedback control such as PI control.

[0017]

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 suspension arm 10 according to a first embodiment of the present invention.
The suspension arm 10 is interposed between a body and a wheel of an automobile, and is used as a control arm for connecting and supporting the wheel side so as to be displaceable with respect to the body side. An arm body 18 is integrally formed with arm eyes 14 and 16 at both ends in the axial direction of the shaft portion 12, and rubber bushes 20 and 22 are mounted on the arm eyes 14 and 16 of the arm body 18, respectively. The suspension arm 10 has a rubber bush 20 at one end.
On the other hand, the other end is attached to the body via a rubber bush 22 so as to be assembled between the wheel and the body.

More specifically, the arm body 18 includes two arm eyes 14 and 16 having a substantially cylindrical shape at both ends in the longitudinal direction of the connecting shaft 12 extending with a substantially constant rectangular cross section.
Are formed in parallel to each other in a direction perpendicular to the connecting shaft portion 12. In addition, the connecting shaft 12
In the middle part in the longitudinal direction, three lightening holes 24, 26, 28 extending in parallel with the arm eyes 14, 16 are provided at a predetermined distance from each other in the longitudinal direction, and are lightweight while securing required rigidity. And the overall volume has been reduced.

Here, as is well known, the arm body 18 restrains the displacement of the wheel in a predetermined direction with respect to the body at the time of an external force such as a braking force, a centrifugal force, a driving force, and a road surface reaction force. Is displaceably suspended with respect to the body. Therefore, the material of the arm body 18 is not particularly limited as long as it has rigidity enough to withstand an external force. However, in the present embodiment, the formability, strength, light weight, durability, and the like are different. For this reason, an aluminum alloy is used. In particular, since the arm body 18 of the present embodiment has the same cross-sectional shape over the entire length of the two arm eyes 14 and 16 in the axial direction, a molded product extruded by hot extrusion or the like is moved in the extrusion direction. By cutting at an appropriate width with a right angle cut surface, it can be easily manufactured with excellent mass productivity without requiring any special post-processing.

The one arm eye 14 of the arm body 18 has a closed cylindrical shape, while the other arm eye 16 has an axially continuous portion at one location on the circumference located on the connecting shaft portion 12 side. An opening slit 30 extending in the circumferential direction is provided, and is divided in the circumferential direction. The opening slit 30 allows the arm eye 16 to open in an expanded state. Furthermore, the mating surfaces 32 and 34 which face each other with the opening slit 30 sandwiched in the circumferential direction are provided with
Each of the two engagement grooves 36, 36 and the engagement protrusions 38, 38 are formed continuously over the entire length of the arm eye 16 in the axial direction (extrusion direction). Close and press both mating surfaces 32 and 34 together.
The closed cylindrical arm eyes 16 are formed by crushing the engagement projections 38 in the engagement grooves 36, 36 so that they cannot be disengaged.

Each of the rubber bushes 20 and 22 has an inner cylindrical fitting 40 and an outer cylindrical fitting 42 disposed on a substantially same axis at a predetermined distance from each other in the radial direction and interposed therebetween. The rubber elastic body 44 having a thick cylindrical shape is formed by vulcanization bonding to the inner and outer peripheral surfaces thereof. Slits 45, 45 penetrating in the axial direction are formed between the inner and outer cylindrical fittings 40, 42 at portions opposed to both sides of the inner cylindrical fitting 40 in the radial direction, respectively. A large spring ratio is set in the direction. One of the rubber bushes 20 is press-fitted and fixed to one of the arm eyes 14 of the arm body 18, while the other rubber bush 22 is connected to the other of the expanded arm eyes 16.
After that, the arm eye 16 is closed and fitted and fixed to the arm eye 16. Thus, the inner cylinder fitting 40 of the one rubber bush 20 is attached to the body side (not shown), and the inner cylinder fitting 40 of the other rubber bush 22 is attached to the wheel side (not shown). But,
It is interposed between the body and the wheel. In addition, the slit 4 of each rubber bush 20,22
5 and 45 are opposed to each other in the arm longitudinal direction when mounted on the arm body 18.

The arm body 18 further includes a connecting shaft 1
A vibrating device 46 is mounted on 2. The vibration device 46 generates a vibration force in a specific direction.
Any device that can control the generation frequency may be used. In particular, in the present embodiment, a device using an electromagnetic driving mechanism as shown in FIG. 2 is employed.

The vibrating device 46 includes a yoke member 50 made of a ferromagnetic material for forming a magnetic path of the permanent magnet 48 and a coil 52 provided on the bracket 5 on which the arm body 18 is mounted.
4 are elastically supported by a first rubber elastic body 56 and a second rubber elastic body 58, respectively. A relative displacement driving force is generated between the member 52 and the yoke member 50 so that an exciting force is exerted.

More specifically, the yoke member 50 has a substantially circular block shape as a whole, and has an insertion hole 60 penetrating in the axial direction on the central axis. Guide sleeves 62 are attached to both ends in the axial direction. In the yoke member 50, a deep groove-shaped concave portion 64 that opens on one surface in the axial direction (the upper surface in FIG. 2) is formed in an annular shape with a radially intermediate portion continuous in the circumferential direction. A ring-shaped permanent magnet 48 is housed in the inside 64, and is bonded to the outer peripheral side wall surface of the recess 64. Here, the permanent magnet 48
Has two magnetic poles set on the inner peripheral side and the outer peripheral side, whereby a substantially closed magnetic path is formed by the yoke member 50, and the yoke member 50 is formed on the magnetic path.
An annular magnetic gap 66 extending continuously in the circumferential direction with a predetermined gap is formed between the inner circumferential side wall surface of the concave portion 64 and the inner circumferential surface of the permanent magnet 48 in the radial direction.

A first connecting member 68 is fixed to the bracket 54 via a first rubber elastic body 56 by bolting a lower portion of the yoke member 50 in the axial direction. It is elastically attached to it. The first connection fitting 68 has a cylindrical shape, and has a shaft 70 of the yoke material 50 at a mounting portion 70 protruding radially outward from an opening peripheral edge on one axial side (the upper side in FIG. 2). It is superimposed on the outer peripheral edge of the direction end surface (the lower surface in FIG. 2) and is fixed by bolts. The bracket 54 has a structure in which a mounting plate portion 74 extending outward in the radial direction is integrally formed with one peripheral portion of the opening of the cylindrical portion 72 in the axial direction (the lower portion in FIG. 2). The cylindrical portion 72 is inserted into the first connection fitting 68 in the axial direction, and is disposed radially inward of the first connection fitting 68 at a predetermined distance. Then, the cylindrical portion 72 of the bracket 54 and the first connection fitting 68
Between the radially opposed surfaces of the first rubber elastic body 5 having an annular shape.
The bracket 54 and a first connection fitting 68 are vulcanized and bonded to the inner and outer peripheral surfaces of the first rubber elastic body 56. Thus, the first connection fitting 68 and the yoke member 50 are elastically connected to the bracket 54 via the first rubber elastic body 56.

Further, the insertion hole 60 of the yoke material 50
The guide rods 76 are inserted in such a manner as to protrude from both sides in the axial direction by a predetermined length, respectively.
By 2, it is supported so as to be displaceable in the axial direction while preventing backlash in the direction perpendicular to the axis. Also, this guide rod 7
A coil 52 is fixedly attached to one end (upper in FIG. 2) of the shaft 6 via an umbrella-shaped support member 80 that extends radially outward. And such a coil 52
Is inserted into the concave portion 64 of the yoke material 50 from the opening side, and in a magnetic gap 66 formed between a radially opposed surface of an inner peripheral side wall surface of the concave portion 64 and an inner peripheral surface of the permanent magnet 48. , Are disposed so as to be displaceable in the axial direction. In short, the guide rod 76 by the guide sleeves 62, 62
Of the magnetic gap 66
Are arranged so as to be relatively displaceable only in the axial direction. A flexible power supply lead wire 82 is provided so as to straddle between the support 80 and the yoke material 50, and is provided at an end of the power supply lead wire 82 on the yoke material 50 side. When the external lead 86 is connected to the connector 84, power is supplied to the coil 52 through the external lead 86 and the power supply lead 82.

At the axial end of the guide rod 76 projecting downward from the insertion hole 60 of the yoke member 50, a second connection metal fitting 78 having a substantially inverted cup shape is inserted and fixed at the center of the bottom wall. Have been. The second connection fitting 78 is inserted and disposed in the cylindrical portion 72 of the bracket 54, and the cylindrical wall of the second connection fitting 78 is formed inside the cylindrical portion 72 of the bracket 54 in the radial direction. Are disposed at a predetermined distance from each other. An annular second rubber elastic body 58 is interposed between radially opposed surfaces of the cylindrical portion 72 of the bracket 54 and the second connection fitting 78, and the second rubber elastic body 58 is provided. The second connection fitting 78 and the bracket 54 are vulcanized and bonded to the inner and outer peripheral surfaces of 58. As a result, the second connecting fitting 78 and thus the coil 52 are attached to the bracket 54 by the second rubber elastic body 5.
8 elastically connected.

The vibration device 46 having such a structure is
The mounting plate 74 of the bracket 54 is attached to the arm main body 18 by being superimposed on the mounting surface of the connecting shaft 12 of the arm main body 18 and fixed at a plurality of locations with bolts 88. When the coil 52 disposed in the magnetic gap is energized, the permanent magnet 4
8 causes an axial relative displacement force between the coil 52 and the yoke member 50 due to the electromagnetic force generated by the interaction with the magnetic flux exerted by the coil 8. The coil 52 and the yoke material 50 are elastically supported by the first and second rubber elastic bodies 56 and 58 with respect to the bracket 54 so that the relative position in the axial direction is elastically held. Therefore, an alternating current or a pulsating current is applied to the coil 52, or
By turning N / OFF, the coil 52 and the yoke 5
0 is relatively reciprocated in the axial direction,
The relative displacement force between the two members 52 and 50 is exerted on the arm body 18 as a vibration force.

In this embodiment, the vibration device 46 is
Central lightening hole 2 provided in connecting shaft 12 of arm body
6 are arranged in a state of being stored in the
4 is superimposed and fixed on the partition wall between the lightening holes 24 and 26, so that the relative displacement force between the coil 52 and the yoke 50 in the vibrating device 46 causes the arm body 18 to move relative to the arm body 18. Is applied as an exciting force in the axial direction substantially on the central axis.

Therefore, the magnitude and frequency of the current supplied to the coil 52 are adjusted, and the vibrating device 46 controls the arm main body 1.
8 is adjusted in accordance with the axial vibration of the arm body 18 so as to actively suppress and control the axial vibration of the arm body 18 based on the superimposing action of the vibrations. You can do it.
In order to obtain an effective active anti-vibration effect for the arm body 18, the current supplied to the coil 52 is controlled using a reference signal having a frequency component or the like corresponding to the vibration to be anti-vibrated. Thus, it is effective to apply an exciting force of a frequency corresponding to the vibration to be damped to the arm main body 18. In this case, the reference signal uses a vibration detection value in the arm main body 18, for example, Naturally, the detected values of vibration and noise on the vehicle body side, which are final reduction targets, can also be used as reference signals.

By reducing the vibration of the arm body 18 in this manner, the vibration energy applied to the body through the arm body 18 is suppressed.
As a result, noise and vibration such as road noise caused by the exciting force transmitted to the body through the arm body 18 can be effectively reduced. In particular, with respect to road noise and the like caused by the excitation force transmitted to the body side through the arm body 18, vibrations and noises that are actually a problem on the body side are directly targeted to obtain a suppression effect. However, the effect of reducing vibration and noise is obtained by transmitting the vibration or acting on the upstream side and the cause side in a flowing manner. It can be advantageously used over a wide range of the room.

Note that the arm body 1 is
In addition to not only reducing the vibration transmitted from the wheel side to the body side via the arm body 18 through the use of the exciting force exerted on the arm body 8 but also aiming at the arm body 18
With respect to the vibration and noise of the body which is not caused by the transmission vibration due to the vibration, the vibrating force which can actively reduce the vibration and noise is applied from the arm main body 18 to the body side by the vibration device 46. It is also possible to actively suppress vibration.

In particular, in the vibrating device 46 of the present embodiment, the yoke member 50 and the coil 52, which are relatively displaced (excited) by the electromagnetic force, are connected to the bracket 54 by the first rubber elastic body 56. The yoke member 50 and the permanent magnet 48 are made to be mass-based and the first rubber elastic body 56 is made to be spring-based by being elastically supported independently of each other via the and the second rubber elastic body 58. Since one vibration system and a second vibration system including the coil 52 and the support 80 as a mass system and the second rubber elastic body 58 as a spring system are configured, these first vibration system and By utilizing the resonance action of the second vibration system, the coil 52 and the yoke material 50
The vibration force generated by the relative displacement of the arm body 18 can be more efficiently exerted on the arm body 18, whereby the more excellent vibration damping effect of the arm body 18 and the vibration and soundproofing effect of the body can be exhibited. It is done.

In particular, since the vibrating device 46 of this embodiment has two independent vibration systems, the natural frequency of each vibration system is determined by considering the vibration frequency in question. By adjusting the mass and the spring constant of the spring system to tune to different frequency ranges, an excellent vibration damping effect can be obtained in a plurality of or a wide frequency range by utilizing the resonance action of the vibration system. It is. Incidentally, FIG. 3 shows a result obtained by actually measuring the frequency characteristics of the generated excitation force exerted on the arm main body 18 via the bracket 54 in the excitation device 46 having the above-described structure. From these results, a large excitation force based on the resonance action is exerted on the arm body 18 at around 400 Hz and around 70 Hz, which are the natural frequencies of the first vibration system and the second vibration system, respectively. It is clear that

The embodiment of the present invention has been described above in detail, but this is merely an example.
It is not to be construed that the invention is limited only to such specific examples.

For example, in the above embodiment, two independent vibration systems are constituted by the yoke member 50 side and the coil 52 side of the vibration device 46.
May be fixedly attached to the arm main body 18 without interposing a rubber elastic body in consideration of the vibration mode and the like in the above.

Further, in the above-described embodiment, since the exciting force of the exciting device 46 is exerted in the axial direction on the central axis of the arm body 18, an effective vibration damping effect against the axial vibration of the arm body 18 is obtained. However, the vibration force by the vibration device 46 can be input to the arm body 18 in various directions in consideration of the vibration direction to be suppressed. That is, for example, when not only the vibration in the arm body 18 in the axial direction but also the vibration in the direction perpendicular to the axis (bending direction) is a problem, the arm body 1
By displacing the axial excitation force input position 8 from the center axis of the arm body 18, both the axial excitation force and the bending excitation force are exerted, and a vibration damping effect can be obtained. is there. Suspension arm 8 as one specific example
8 is shown in FIG. In FIG. 4, members and portions having the same structure as in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, for easy understanding.

When the bending vibration in the arm body 18 is suppressed, the vibrating force acting position, that is, the vibrating force acting position is determined in consideration of the vibration mode and the like in the arm body 18 so as to exhibit an effective vibration damping effect. It is desirable to determine the mounting position of the vibration device 46.

Further, the vibration means for applying a vibration force to the suspension member is not limited to a means utilizing an electromagnetic driving force as shown in the examples, but a magnet attraction force generated by energizing a coil causes a ferromagnetic force. An electromagnet type for attracting a body or a permanent magnet, an electrostrictive element, a magnetostrictive element, or the like may be used. Specifically, for example, in FIG.
A specific example of a suspension arm in which an exciting force is applied in the axial direction of the arm main body 18 in the same manner as in the above-described embodiment using an exciting device 90 using an electrostrictive element is shown. As is well known, the vibrating device 90 is formed by laminating a plurality of elements made of piezoelectric ceramics having an inverse piezoelectric effect such as barium titanate or PZT so that an appropriate expansion / contraction stroke can be obtained. A so-called laminated ceramic actuator or the like is preferably employed. The vibration device 90 is connected to the arm body 18.
Is housed in the lightening hole 26 at the center of the main body, and is arranged in a state of being pre-compressed in the laminating direction, which is the stretching direction, between the partition walls on both sides in the axial direction, so that a voltage is applied to each laminated element. Thus, the expansion and contraction force generated in the laminating direction of the vibration device 90 is exerted on the arm body 18 as an axial vibration force. In FIG. 5, in order to facilitate understanding, members and parts having the same structure as the above-described embodiment will be described.
The same reference numerals are assigned to the respective embodiments.

Further, in the above-described embodiment, a specific example is shown in which the present invention is applied to a suspension arm in which rubber bushes 20 and 22 are assembled on both sides in the axial direction. However, the present invention is applicable to suspension members having various structures. Is applicable. Specifically, the present invention is advantageously applicable to various suspension members such as a suspension arm whose axial end is connected to a wheel side or a body side by a pillow ball or the like, or a control rod, a sub member, a shock absorber, or the like. Can be applied.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0043]

As is apparent from the above description, any of the vibration-isolating suspension members having the structure according to the first to seventh aspects of the present invention has a problem in that the vibration-causing side and the noise-causing side are all problematic. The vibration on the vibration transmission path is reduced by the vibration means, and the vibration transmission itself to the body side is reduced, so that the vibration and noise can be advantageously suppressed in the entire vehicle interior. It is.

In addition, by suppressing the vibration on the vibration transmission path, which is the cause of the vehicle interior vibration and noise, which is a problem, a limited number of suspension members can be provided. By virtue of the simple structure of mounting the vibration means, vibration and noise in the entire vehicle cabin can be effectively and easily suppressed.

[Brief description of the drawings]

FIG. 1 is a front view showing a suspension arm as one embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a vibration device used for the suspension arm shown in FIG. 1;

FIG. 3 is a graph showing a result of measuring a frequency characteristic of an output of the vibration device shown in FIG. 2;

FIG. 4 is a front view showing a suspension arm as another specific example of the present invention.

FIG. 5 is a front view showing a suspension arm as still another specific example of the present invention.

[Explanation of symbols]

 10,88 Suspension arm 18 Arm body 20,22 Rubber bush 24,26,28 Lightening hole 46,90 Vibration device 48 Permanent magnet 50 Yoke material 52 Coil 54 Bracket 56 First rubber elastic body 58 Second rubber elastic body

Claims (7)

[Claims] A rigid suspension member interposed between a body and a wheel of an automobile to form a suspension device, wherein an excitation force that exerts an excitation force in a vibration transmission direction and is capable of frequency control of generated excitation force. A vibration damping suspension member characterized in that vibration means is actively reduced by vibrating force exerted by said vibrating means by providing means. 2. The vibration-damping suspension member according to claim 1, wherein at least one vibration-damping rubber is disposed on a connection path between the body and the wheel in the suspension device. 3. An anti-vibration device according to claim 1, wherein said vibration means is an electromagnetic vibration means for generating a vibration force based on a magnetic force or an electromagnetic force generated by energizing a coil. Suspension members. 4. An anti-vibration device according to claim 1, wherein the vibrating means is configured by assembling an electrostrictive element which expands and contracts by a change in an electric field in advance in a deformation direction and is assembled. Suspension members. 5. The suspension member according to claim 1, wherein said vibration means is mounted in a housed state. 6. At least one vibration system is configured by elastically attaching at least one of a working-side output member and a reaction-side output member of a vibrating force in the vibrating means by a support spring member, The suspension member according to any one of claims 1 to 5, wherein a vibration force generated by the vibration means is exerted through the vibration system. 7. A control device is provided for controlling the operation of the vibrating means based on the reference signal such that a signal corresponding to the vibration transmitted to the body side is used as a reference signal and the vibration is reduced. The suspension member for vibration isolation according to any one of claims 1 to 6.