JPH1054439A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a vibration isolator by a pair of actuators so arranged as to be faced to each other across one end of a vibrating member, and for generating exciting force for vibrating the vibrating member by respectively and alternately generating the magnetic field. SOLUTION: A movable plate 20 is supported between a lower attaching table 12 to be placed on a vehicle body and an outer cylinder 26 so as to be displaced. An elastic body 28 is vulcanized and bonded on the inner peripheral side of the outer cylinder 26, and a part between the elastic body 28 and the movable plate 20 is taken as a pressure receiving liquid chamber 34. A connecting pin 22 penetrating the movable plate 20 is fixed on the center part of the movable plate 20, and a steel-made disk 24 is provided on the lower end of the connecting pin 22. A first electromagnet 50 is housed in the lower attaching table 1, 2, and a second electromagnet 60 is housed in the lower part in the lower attaching table 12 so as to be separated from the first electromagnet by the constant wide space. Accordingly, the electromagnets 50, 60 are so arranged as to be faced to each other across the disk 24 arranged on the lower end of the connecting pin 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for absorbing vibration from a vibration generator, and more particularly to a vibration isolator for preventing transmission of engine vibration to a vehicle body.

[0002]

2. Description of the Related Art An automobile engine is supported on a vehicle body by a vibration isolator, and this vibration isolator prevents transmission of engine vibration to the vehicle body. As an example of such a vibration isolator, a vibration isolator as shown in FIG. 8 has been proposed, and a conventional vibration isolator will be described with reference to FIG.

The vibration isolator 110 shown in FIG.
The pressure receiving liquid chamber 114 whose internal volume changes due to the deformation of the pressure receiving liquid 12, the movable plate 116 serving as a partition wall of the pressure receiving liquid chamber 114, and the movable plate 1
It has a structure having an electromagnet 118 that vibrates 16 and the like.

Therefore, when an engine (not shown) mounted on the vibration isolator 110 is operated to generate vibration, the vibration is absorbed by the deformation of the elastic body 112 and the electromagnet 11
The movable plate 116 is vibrated in the vertical direction with a waveform approximating a sine waveform by the electromagnetic force generated by the pressure receiving liquid chamber 11.
Vibration is absorbed by preventing the hydraulic pressure in 4 from rising.

[0005] However, the force attracted by the electromagnet 118 decreases in inverse proportion to the square of the distance. Therefore, the electromagnet 118
In the control type vibration damping device 110 using the
In order to efficiently generate a sinusoidal vibration on the movable plate 116 by the electromagnetic force generated by the
It is conceivable to apply an initial displacement to the movable plate 116 so as to approach the 18 side, and then vibrate the movable plate 116 with the electromagnetic force of the electromagnet 118.

[0006]

However, in the case of the vibration isolator having such a structure, the rubber supporting member 122 for supporting the movable plate 116 so as to be displaceable is always in a state of being deformed by the permanent magnet 120. The support member 12
No. 2 is liable to malfunction normally due to permanent distortion, and as a result, the durability of the vibration isolator is reduced.

An object of the present invention is to provide a vibration isolator which can improve durability in consideration of the above fact.

[0008]

According to a first aspect of the present invention, there is provided a vibration isolator which is connected to one of a vibration generator and a vibration receiver, and connected to the other of the vibration generator and the vibration receiver. A second mounting member, an elastic body provided between the first mounting member and the second mounting member, and a pressure-receiving liquid chamber that expands and contracts when vibration occurs when the elastic body is used as a part of a partition. A vibrating member configured to be able to displace another part of the partition wall of the pressure-receiving liquid chamber, and the vibrating member arranged so as to face each other with one end of the vibrating member interposed therebetween and alternately generating a magnetic field. And a pair of actuators for generating an exciting force for vibrating the actuator.

According to a second aspect of the present invention, there is provided an anti-vibration apparatus according to the first aspect, further comprising control means for operating the pair of actuators, and a sensor for detecting an amplitude of vibration of the vibration receiving portion. The control means drives the pair of actuators based on the amplitude of the vibration of the vibration receiving unit.

The operation of the vibration isolator according to claim 1 will be described below. When one of the first mounting member and the second mounting member is connected to a vibration generating unit, for example, an engine, and the other is connected to a vibration receiving unit. As the body is deformed, the vibration is attenuated by the deformation of the elastic body, the engine vibration is absorbed, and the vibration is hardly transmitted to the vibration receiving portion side.

In addition, the pressure of the liquid in the pressure receiving liquid chamber tends to fluctuate with the deformation of the elastic body. A pair of actuators arranged opposite to each other alternately generate a magnetic field to generate an exciting force for vibrating the vibrating member, thereby causing the vibrating member to vibrate. Therefore, the pair of actuators vibrate the vibration member so that the change in the liquid pressure in the pressure receiving liquid chamber is suppressed and the amplitude of the vibration of the vibration receiving unit is reduced, so that the engine vibration is further absorbed and the vibration receiving unit is The vibration is more difficult to be transmitted to the side.

Further, since the vibrating member is vibrated by a pair of actuators arranged to face each other with one end of the vibrating member interposed therebetween, a sinusoidal vibration can be generated without using a permanent magnet. Becomes For this reason, the supporting portion of the vibration member is not subjected to permanent distortion by the permanent magnet, and the durability of the vibration isolator is improved.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same function as the first embodiment. However, the present invention has a control means for operating the pair of actuators and a sensor for detecting the amplitude of the vibration of the vibration receiving section, and the control means has a pair of the control means based on the amplitude of the vibration of the vibration receiving section detected by the sensor. It is configured to drive an actuator.

Therefore, the pair of actuators are driven based on the amplitude of the vibration of the vibration receiving portion detected by the sensor, so that the vibration can be absorbed more reliably.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 4, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1, this vibration isolator main body 10
Is provided with a cup-shaped lower mounting base 12 as a first mounting member. The bottom plate 1 of the lower mounting base 12
2B is formed in a disk shape, and mounting bolts 14 are provided upright on the lower surface. A cylindrical upright wall portion 12A having a one-step large diameter is formed around the bottom plate 12B, and a flange portion 12C extending outward in the radial direction is formed at an upper end portion of the upright wall portion 12A.

In the present embodiment, the lower mounting base 12 is mounted on a vehicle body (not shown) of the automobile, and the mounting bolt 1
4 is fixed to the vehicle body by screwing a nut (not shown).

On the other hand, the flange portion 12C of the lower mounting base 12
A bent upper end portion of the ring-shaped support member 16 is located at an upper portion, and is provided between an inner peripheral surface of the support member 16 and an outer peripheral surface of the disk-shaped movable plate 20 made of steel. A support member 18 made of rubber is vulcanized and bonded over one circumference to connect the support bracket 16 and the movable plate 20. Therefore, the movable plate 20 is supported so as to be vertically displaceable by the elasticity of the support member 18.

On the outer peripheral side of the movable plate 20, the movable plate 2
A cylindrical outer cylinder 26 is disposed coaxially with the outer cylinder 26. At the lower end of the outer cylinder 26, a flange portion 26A extending outwardly is provided.
The outer peripheral side of the flange portion 26A is bent inward and caulked, and the outer cylinder 2 is sandwiched between the flange portion 26A and the flange portion 12C of the lower mounting base 12 while holding the support fitting 16 therebetween.
6 and the lower mounting base 12 are fixed.

Further, the inner and outer diameters of the outer cylinder 26 are increased toward the upper side, and a cylindrical elastic body 28 is vulcanized and bonded to the inner peripheral side of the outer cylinder 26. A part of the elastic body 28 is thinly extended to near the lower end of the inner periphery of the outer cylinder 26. An upper mounting member 32 as a second mounting member is provided at the upper central portion of the elastic body 28.
The upper surface of the elastic body 28 is also vulcanized and bonded to the lower surface of the upper mounting member 32.

A mounting bolt 38 is provided upright at the upper central portion of the upper mounting member 32. The mounting bolt 38 is screwed to an engine (not shown), and the upper mounting member 3 is screwed.
2 is connected to the engine.

The space between the elastic body 28 and the movable plate 20 is
A pressure receiving liquid chamber 34 is provided, and the inside of the pressure receiving liquid chamber 34 is filled with a liquid such as ethylene glycol. A connecting pin 22 that penetrates the movable plate 20 is fixed to the center of the movable plate 20 by welding or the like, and a steel disk 24 formed in a flange shape at the lower end of the connecting pin 22. Is provided.

Therefore, the movable plate 20 and the connecting pins 22
And the disk 24 form a vibrating member which makes a part of the partition wall of the pressure receiving liquid chamber 34 displaceable, and the disk 24 which is one end of the vibrating member is displaced up and down, so that the connecting pin 2
The movable plate 20 connected to the disk 24 via 2 is vertically displaced integrally.

A ring-shaped yoke 52 containing a coil 54 is housed in a portion near the upper portion in the lower mounting base 12, and the coil 54 and the yoke 52 constitute a first electromagnet 50. ing. Further, a yoke 62 with a built-in coil 64 is provided in a lower portion of the lower mounting base 12 with a space of a certain width interposed between the first electromagnet 50 and the yoke 62.
Are stored, and the second electromagnet 60 is configured by the coil 64, the yoke 62, and the like.

Therefore, as shown in FIG. 1, the connecting pin 22 passes through the yoke 52 of the first electromagnet 50, and the disk 24 disposed at the lower end of the connecting pin 22 is sandwiched therebetween.
Electromagnets 50 and 60 as a pair of actuators are arranged on lower mount 12 so as to face each other.

That is, in the initial state where no electromagnetic force is generated, no displacement is applied to the support member 18 supporting the movable plate 20 connected to the disk 24, and as shown in FIG.
The disk 24 is disposed at a substantially central portion of the space between the first electromagnet 50 and the second electromagnet 60 and is separated from the electromagnets 50 and 60 by a predetermined distance.

As described above, the movable plate 20 mounted between the outer cylinder 26 and the lower mounting base 12 via the flexible support member 18 constitutes a lower partition of the pressure receiving liquid chamber 34, The movable plate 20 is moved up and down by the electromagnetic force of the electromagnets 50 and 60, so that the pressure of the liquid in the pressure receiving liquid chamber 34 can be prevented from rising.

On the other hand, the electromagnets 50 and 60 are respectively connected to a control device 40 as control means, and a vibration sensor 42 for detecting vibration for detecting the amplitude of vibration of the vehicle body is mounted on the vehicle body. And connected to the control device 40. Note that an acceleration sensor or the like can be used as the vibration sensor 42.

Next, the operation of the present embodiment will be described. When engine vibration is input from the engine to the vibration isolator body 10, the elastic body 28 is deformed and
The vibration is attenuated by the deformation, and the engine vibration is absorbed, and the vibration is hardly transmitted to the vehicle body.

Further, the pressure of the liquid in the pressure receiving liquid chamber 34 tends to fluctuate with the deformation of the elastic body 28. At this time, a pair of the liquid pressure receiving chambers 34 are disposed opposite to each other with the disk 24 interposed therebetween. The electromagnets 50 and 60 generate an exciting force to vibrate the movable plate 20 by generating magnetic fields alternately, and vibrate the movable plate 20.

That is, when the engine vibration is input to the vibration isolator main body 10 and the elastic body 28 is deformed such that the volume of the pressure receiving liquid chamber 34 first increases and the liquid pressure in the pressure receiving liquid chamber 34 decreases, Control device 4 based on a signal from vibration sensor 42
0 causes a current to flow only through the first electromagnet 50 as shown in FIG. Thereby, a magnetic field is applied to the disk 24 from above,
From the state shown in FIG. 1 to the first electromagnet 50 as shown in FIG.
The disk 24 is attracted to the movable plate 20
Is displaced upward, and the decrease in the liquid pressure in the pressure receiving liquid chamber 34 is reduced.

Next, when the elastic body 28 is deformed so that the volume of the pressure receiving liquid chamber 34 is reduced and the liquid pressure in the pressure receiving liquid chamber 34 is increased, the control device 40 is controlled based on a signal from the vibration sensor 42.
However, as shown in FIG. 4, the current stops flowing to the first electromagnet 50 and the current flows to the second electromagnet 60. As a result, a magnetic field is applied to the disk 24 from below, and the disk 24 is attracted from the state shown in FIG. 2 to the second electromagnet 60 side as shown in FIG. 3, and the movable plate 20 moves downward accordingly. As a result, the rise in the liquid pressure in the pressure receiving liquid chamber 34 is reduced.

Thereafter, when the volume of the pressure receiving liquid chamber 34 is increased again, the control device 40 makes the same judgment as described above, and returns the disk 24 and the movable plate 20 to the positions shown in FIG.

The movable plate 20 vibrates in the up and down direction by repeating the above operation continuously and alternately repeating the current to flow through the pair of electromagnets 50 and 60.

As described above, the pair of electromagnets 50 and 60 vibrate the movable plate 20 so as to suppress the change in the liquid pressure in the pressure receiving liquid chamber 34 and reduce the amplitude of the vibration of the vehicle body, thereby further increasing engine vibration. The vibration is absorbed and the vibration is more difficult to be transmitted to the vehicle body side.

Further, the disk 2 constituting one end of the vibration member
Since the movable plate 20 is vibrated by the pair of electromagnets 50 and 60 which are arranged to face each other with the 4 interposed therebetween, it is possible to easily generate a sinusoidal vibration without using a permanent magnet. . For this reason, the support member 18 supporting the movable plate 20 is not subjected to permanent distortion by the permanent magnet, and the durability of the vibration isolator main body 10 is improved.

Further, the vibration isolator according to the present embodiment has a control device 40 for operating the pair of electromagnets 50 and 60 and a vibration sensor 42 for detecting the amplitude of vibration of the vehicle body. The control device 40 drives the pair of electromagnets 50 and 60 based on the amplitude of the vibration of the vehicle body.

Therefore, the pair of electromagnets 50 and 60 are driven based on the amplitude of the vibration of the vehicle body detected by the vibration sensor 42, so that the vibration of the engine can be more reliably absorbed by the vibration isolator body 10. Become.

As described above, according to the present embodiment, transmission of engine vibration to the vehicle body side can be effectively prevented. In addition, the above-described configuration causes a change in engine speed, that is, an increase or decrease in the frequency of engine vibration. The pressure rise of the pressure receiving liquid chamber 34 can be suppressed. For this reason, the vibration isolator main body 10 of the present embodiment can reliably absorb vibration over a wide range of frequencies.

Next, a second embodiment of the vibration isolator according to the present invention is shown in FIG. 5, and the present embodiment will be described with reference to FIG. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 5 showing the present embodiment, the present embodiment has substantially the same structure as the first embodiment, but does not include the mounting bolts 14 and the flange portion of the outer cylinder 26. A cylindrical portion 26B formed in a cylindrical shape is provided at a tip portion of 26A, and a connecting portion 26C is formed to extend from the lower end of the cylindrical portion 26B to the outer peripheral side. And the lower mounting base 12
Of the flange portion 12C is bent inward to form the outer cylinder 2
The outer cylinder 26 and the lower mounting base 12 are connected by being swaged with the connecting portion 26C of No. 6.

Further, a plurality of through holes 72 are formed in the connecting portion 26C of the outer cylinder 26 and the flange portion 12C of the lower mounting base 12 so as to integrally penetrate them. A support bracket 16 for supporting the movable plate 20 is fitted and fixed to the inner peripheral side.

As described above, the present embodiment operates similarly to the first embodiment. However, in this embodiment, a bolt (not shown) is passed through the through hole 72 instead of the mounting bolt 14 and fixed to the vehicle body. Have the difference that

Next, a third embodiment of the vibration isolator according to the present invention is shown in FIG. 6, and this embodiment will be described with reference to FIG. The same members as those described in the first embodiment and the second embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 6 showing the present embodiment, the present embodiment has substantially the same structure as the first embodiment and the second embodiment. Part 26
The distal end side of C is bent inward and swaged with the flange portion 12C of the lower mounting base 12, and the outer cylinder 26 and the lower mounting base 12 are connected. A support bracket 16 for supporting the movable plate 20 is fitted and fixed to the inner peripheral side of the cylindrical portion 26B of the outer cylinder 26. Therefore, the present embodiment operates similarly to the above-described embodiment.

Next, a fourth embodiment of a vibration isolator according to the present invention is shown in FIG. 7, and the present embodiment will be described with reference to FIG. The same members as those described in the first to third embodiments are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 7 showing the present embodiment, the present embodiment has substantially the same structure as the first to third embodiments, and is similar to the above-described embodiment. This embodiment also works, but the cylindrical portion 26B of the outer cylinder 26 of this embodiment is formed longer than the other embodiments, and the movable plate 20 is supported on the inner peripheral side of the cylindrical portion 26B. Metal fittings 16 are fitted and fixed.

As a result, the length of the support bracket 16 can be increased, and the fitting length between the cylindrical portion 26B and the support bracket 16 can be increased. As a result, the support bracket 16 is firmly fixed to the outer cylinder 26. It has the feature that it will be.

In the above-described embodiment, the lower mounting base 12 having the actuator is mounted on the vehicle body. However, the lower mounting base 12 may be mounted on the engine. That is, the actuator may be located on either side of the first mounting member or the second mounting member. Further, a well-known driving unit other than the electromagnet may be employed as the pair of actuators.

On the other hand, in the embodiment, the purpose is to dampen an engine mounted on an automobile, but the anti-vibration device of the present invention is also used for, for example, a body mount of a vehicle or other uses other than the vehicle. Needless to say, the shapes and dimensions of the elastic body, the electromagnet, and the like are not limited to those of the embodiment.

[0051]

As described above, according to the present invention, there is an excellent effect that the durability of the vibration isolator can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator main body according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vibration isolator main body according to the first embodiment of the present invention, showing a state where a movable plate is raised.

FIG. 3 is a cross-sectional view of the vibration isolator main body according to the first embodiment of the present invention, showing a state where a movable plate is lowered.

FIG. 4 is a diagram showing a timing chart showing the timing of the current flowing to the electromagnet of the vibration isolator according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a vibration isolator main body according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a vibration isolator main body according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a vibration isolator main body according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a vibration isolator main body according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator main body 12 Lower mounting base (first mounting member) 20 Movable plate (vibrating member) 28 Elastic body 32 Upper mounting member (second mounting member) 34 Pressure receiving liquid chamber 50 First electromagnet (actuator) 60 Second electromagnet (actuator) 40 Control device (control means) 42 Vibration sensor (sensor)

Claims (2)

[Claims] A first mounting member connected to one of the vibration generating unit and the vibration receiving unit; a second mounting member connected to the other of the vibration generating unit and the vibration receiving unit; and the first mounting An elastic body provided between the member and the second mounting member; a pressure-receiving liquid chamber which expands / contracts when the vibration occurs when the elastic body serves as a part of the partition; and displaces another part of the partition of the pressure-receiving liquid chamber. And a pair of actuators that are arranged to face each other with one end of the vibrating member interposed therebetween, and that generate an exciting force for vibrating the vibrating member by alternately generating a magnetic field. An anti-vibration device comprising: 2. A control device for operating the pair of actuators, and a sensor for detecting an amplitude of vibration of the vibration receiving unit, wherein the control unit performs the control based on the amplitude of the vibration of the vibration receiving unit detected by the sensor. The vibration isolator according to claim 1, wherein the pair of actuators are driven.