JPH1130269A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively use the force of an actuator and effectively control the fluctuation of internal pressure. SOLUTION: A support fitting 16 is positioned between an outer cylinder fitting 26 and a lower mount 12 with an electromagnet 50 enclosed therein. An elastic support member 18 with its outer peripheral side vulcanization-bonded to the inner peripheral surface of the support fitting 16 and with its inner peripheral side vulcanization-bonded to the outer peripheral surface of a movable plate 20 is formed of rubber material, and the movable plate 20 is supported in a vertically displaceable state by the elasticity of the elastic support member 18. An inter-ring 22 partitioning the elastic support member 18 into an outer peripheral part 18A connected to the support fitting 16, and an inner peripheral part 18B connected to the movable plate 20 is arranged in the elastic support member 18. An elastic body 28 is vulcanization-bonded to the inner peripheral side of the outer cylinder fitting 26, and space between the elastic body 28 and the movable plate 20 is formed into a pressure receiving liquid chamber 34.

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 FIGS. 3 and 4 has been proposed, and a conventional vibration isolator will be described below with reference to these drawings.

[0003] Of these figures, the vibration isolator 11 shown in FIG.
0 denotes a pressure receiving liquid chamber 114 whose internal volume changes due to deformation of the elastic body 112, and a movable plate 116 serving as a partition of the pressure receiving liquid chamber 114.
Further, the structure has an electromagnet 118 as an actuator for vibrating the movable plate 116 and the like.

[0004] A movable plate 116 is displaceably supported by an elastic support member 122 formed of an elastically deformable leaf spring, and an O for sealing the pressure receiving liquid chamber 114.
A seal structure such as a ring 120 is employed around the elastic support member 122.

A vibration isolator 130 shown in FIG. 4 has substantially the same structure as that of the above-described vibration isolator 110, but has an elastic support member 13 made of an elastically deformable rubber material.
2, the movable plate 116 is displaceably supported.

Therefore, these vibration isolating devices 110, 130
When an engine (not shown) mounted on the actuator operates to generate vibration, the elastic body 112 absorbs the vibration and deforms the movable plate 116 by the electromagnetic force generated by the electromagnet 118.
Is vibrated in a vertical direction with a waveform approximating a sine waveform, and the vibration is absorbed by controlling the liquid pressure in the pressure receiving liquid chamber 114 so as not to increase.

[0007]

However, although it is necessary to lower the rigidity of the spring and use the force of the electromagnet 118 more effectively, the rigidity of the leaf spring is higher than that of rubber or the like. The vibration isolator 110 having a structure using a leaf spring as the elastic support member 122 as described above has a disadvantage that the force of the electromagnet 118 cannot be used effectively.

Further, with the use of a leaf spring having high rigidity, it is necessary to use an elastic support member 122 having a larger area in order to obtain a sufficient displacement of the movable plate 116. Therefore, in order to effectively control the fluctuation of the internal pressure, which is the liquid pressure in the pressure receiving liquid chamber 114, it is necessary to enlarge the movable plate 116 to increase the effective diameter D shown in the drawing. Has a disadvantage that it is difficult to increase the effective diameter D. Here, the effective diameter D is an intermediate value between the inner diameter and the outer diameter of the ring-shaped elastic support member.

On the other hand, in order to effectively control the fluctuation of the internal pressure of the pressure receiving liquid chamber 114, the volume change of the elastic support member itself due to the fluctuation of the internal pressure is reduced, and the volume elasticity (here, the reciprocal of the volume change is calculated. (Referred to as bulk elasticity). However, in the case of the vibration isolator 130 having a structure using the rubber material as the elastic support member 132, although the effective diameter D is large, the elastic support member 132 is largely bent so as to be curved as shown in FIG. It has a drawback that it is difficult to perform. For this reason, in the vibration isolator using only the rubber material as the elastic support member, the fluctuation of the internal pressure of the pressure receiving liquid chamber cannot be sufficiently controlled.

The present invention has been made in view of the above circumstances, and has as its object to provide a vibration isolator capable of effectively utilizing the force of an actuator and effectively controlling the fluctuation of the internal pressure of a pressure receiving liquid chamber.

[0011]

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 that forms another part of the partition wall of the pressure-receiving liquid chamber; and a pressure-receiving member that is formed of a rubber material and whose outer peripheral side is connected to one of the mounting members and whose inner peripheral side is connected to the vibrating member. An elastic support member that displaceably supports the vibration member while sealing the liquid chamber; and an intermediate section that partitions the elastic support member into a portion connected to any one of the attachment members and a portion connected to the vibration member. Generates an exciting force to vibrate the member and the vibrating member An actuator that, characterized by comprising a.

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 actuator, and a sensor for detecting the amplitude of vibration of the vibration receiving portion.
The control unit drives the actuator based on the amplitude of the vibration of the vibration receiving unit detected by the sensor.

The operation of the vibration isolator according to the first aspect 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.

Further, the pressure of the liquid in the pressure receiving liquid chamber tends to fluctuate with the deformation of the elastic body. At this time, the actuator generates an exciting force and forms a part of the partition wall of the pressure receiving liquid chamber. Vibrating the vibrating member. Therefore, the actuator vibrates the vibrating member so that the vibration of the vibration receiving portion is reduced by suppressing the change in the liquid pressure in the pressure receiving liquid chamber, so that the engine vibration is further absorbed, and the vibration receiving portion side is moved. Vibration is more difficult to be transmitted.

Further, an outer peripheral side of an elastic supporting member formed of a rubber material and displaceably supporting the vibrating member while sealing the pressure receiving liquid chamber is connected to one of the mounting members. Is connected to the vibrating member,
The intermediate member divides the elastic support member into a portion connected to one of the attachment members and a portion connected to the vibration member.

Therefore, by using an elastic support member formed of a rubber material having low rigidity, not only can the force of the actuator be effectively used, but also the effective diameter can be increased to reduce the internal pressure of the pressure-receiving liquid chamber. Fluctuations can be effectively controlled.

In addition, since the intermediate member divides the elastic support member into a portion connected to any one of the mounting members and a portion connected to the vibration member, the elastic support member itself is caused by a change in internal pressure. The volume change can be reduced and the volume elasticity can be increased, and the fluctuation of the internal pressure of the pressure receiving liquid chamber can be more effectively controlled.

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, in the present invention, there is provided control means for operating the actuator and a sensor for detecting the amplitude of the vibration of the vibration receiving section, and the control means drives the actuator based on the amplitude of the vibration of the vibration receiving section detected by the sensor. It has a configuration.

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

[0020]

1 and 2 show an embodiment of a vibration isolator according to the present invention, and the present embodiment will be described with reference to these drawings.

As shown in FIG. 1, a lower portion of a vibration isolator main body 10 constituting a main body of the vibration isolator according to the present embodiment is provided.
A lower mounting base 12 formed in a cup shape is provided. The bottom plate 12B of the lower mounting base 12 has a disk shape,
A mounting bolt 14 is provided upright on the lower surface. Bottom plate 12B
Is formed around the cylindrical wall 12A.
A flange portion 12 extending outward in the radial direction is provided at the upper end of 2A.
C is formed.

In the present embodiment, the lower mounting base 12 is mounted on a vehicle body (not shown),
A nut (not shown) is screwed into the mounting bolt 14 to be connected and fixed to the vehicle body.

On the other hand, the flange portion 12C of the lower mounting base 12
The lower end portion of the ring-shaped support member 16 is located at the upper part of the support member 16. The outer peripheral side of the support member 16 is connected to the inner peripheral surface of the support member 16 by vulcanization bonding and is formed of a disc-shaped steel member. An elastic support member 18 whose inner peripheral side is vulcanized and connected to the outer peripheral surface of the movable plate 20 is formed of a rubber material in a ring shape, and is disposed between the support bracket 16 and the movable plate 20. I have. Therefore, the movable plate 20 is supported so as to be vertically displaceable by the elasticity of the elastic support member 18.

Further, an inter-ring 22 which is an intermediate member for partitioning the elastic support member 18 into an outer peripheral portion 18A connected to the inner peripheral surface of the support fitting 16 and an inner peripheral portion 18B connected to the outer peripheral surface of the movable plate 20. Are formed of metal in a ring shape and are disposed in the elastic support member 18.

Further, a cylindrical outer tube fitting 26 is disposed at a position coaxial with the movable plate 20 on the outer peripheral side of the movable plate 20. A connecting portion 26A is provided at the lower end portion of the outer tube fitting 26 over the entire circumference of the outer tube fitting 26. The outer peripheral side of the connecting portion 26A is bent inward and caulked, and the flange portion 12C of the lower mounting base 12 is formed. Support bracket 1 between
6, the outer tube fitting 26 and the lower mounting base 12 are fixed to each other.

As described above, the outer tube fitting 26 and the lower mount 12 constitute a first mounting member, and the outer tube fitting 2
6 and the lower mounting base 12 are connected to the outer peripheral side of the elastic support member 18 via the support fitting 16.

Further, the inner and outer diameters of the outer tubular fitting 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 tubular fitting 26. A part of the elastic body 28 is thinly extended to near the lower end of the inner periphery of the outer metal fitting 26. An upper mounting member 32 as a second mounting member is disposed in the upper central portion of the elastic body 28, and 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) which is a vibration generating part, and the upper mounting member 32 is attached to the engine. Be linked.

On the other hand, a space between the elastic body 28 and the movable plate 20 is a pressure receiving liquid chamber 34, and the inside of the pressure receiving liquid chamber 34 is filled with a liquid such as ethylene glycol. Accordingly, the movable plate 20 serves as a vibration member that constitutes a part of the partition wall of the pressure receiving liquid chamber 34, and the elastic support member 18 displaceably supports the movable plate 20 while sealing the pressure receiving liquid chamber 34. Become.

In the lower mounting table 12, a coil 54 is provided.
Are housed, and the coil 54 and the yoke 52 constitute an electromagnet 50. Therefore, the electromagnet 5 as an actuator
0 is arranged in the lower mounting base 12.

As described above, the elastic supporting member 1 having flexibility
The movable plate 20 attached between the outer tube fitting 26 and the lower mounting base 12 through the upper surface 8 constitutes a partition on the lower side of the pressure receiving liquid chamber 34, and the movable plate 20 is vertically moved by the electromagnetic force of the electromagnet 50. It is possible to prevent the pressure of the liquid in the pressure receiving liquid chamber 34 from rising.

On the other hand, the electromagnet 50 is connected to the control device 40 which is a control means, and a vibration sensor 42 for detecting a vibration for detecting the amplitude of the vibration of the vehicle is provided on the vehicle body.
Is attached and connected to the control device 40. Note that an acceleration sensor or the like can be used as the vibration sensor 42.

In the initial state in which no electromagnetic force is generated, no displacement is applied to the elastic support member 18 supporting the movable plate 20, and as shown in FIG. They are located at a distance from each other.

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.

The pressure of the liquid in the pressure receiving liquid chamber 34 tends to fluctuate in accordance with the deformation of the elastic body 28. At this time, the electromagnet 50 generates a magnetic field, and the movable plate 20 vibrates. A force is generated to vibrate the movable plate 20 forming a part of the partition wall of the pressure receiving liquid chamber 34.

That is, when the engine vibration is input to the vibration isolator main body 10 and 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 vibration sensor Control device 40 based on the signal from
Causes a current to flow through the electromagnet 50. Thereby, the movable plate 20
A magnetic field is applied from below to the electromagnet 50 as shown in FIG.
The movable plate 20 is attracted to the side, the movable plate 20 is displaced downward, and the rise of the liquid pressure in the pressure receiving liquid chamber 34 is reduced.

Thereafter, the elastic body 28 is deformed and the pressure receiving liquid chamber 3 is deformed.
When the volume of 4 increases, the control device 40 stops the flow of current to the electromagnet 50 based on the signal from the vibration sensor 42, and returns the movable plate 20 to the position shown in FIG.

Hereinafter, the above operation is continuously repeated, and the control device 40 repeatedly supplies a current to the electromagnet 50, so that the movable plate 20 is displaced so as to vibrate in the vertical direction.

As described above, the electromagnet 50 vibrates 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. The vibration is more difficult to be transmitted to the side.

Further, the outer peripheral side of the elastic support member 18 which is formed of a rubber material and supports the movable plate 20 so as to be displaceable while sealing the pressure receiving liquid chamber 34 is connected to the outer cylindrical fitting 26 and the lower part via the support fitting 16. The elastic support member 18 is connected to the mount 12 and the inner peripheral side of the elastic support member 18 is connected to the movable plate 20. Further, the inter-ring 22 divides the elastic support member 18 into an outer peripheral portion 18A connected to the inner peripheral surface of the support bracket 16 and an inner peripheral portion 18B connected to the outer peripheral surface of the movable plate 20.

Therefore, by using the elastic support member 18 made of a rubber material having low rigidity, not only can the electromagnetic force of the electromagnet 50 be effectively used, but if the same durability is provided, the plate spring can be used. In comparison, the effective diameter D is increased, and the fluctuation of the internal pressure of the pressure receiving liquid chamber 34 can be effectively controlled. Further, since the inter-ring 22 divides the elastic support member 18 into an outer peripheral portion 18A and an inner peripheral portion 18B, the flexure of the elastic support member 18 is reduced, and the volume of the elastic support member 18 itself accompanying the fluctuation of the internal pressure is reduced. The volume elasticity can be increased by reducing the change, and the fluctuation of the internal pressure of the pressure receiving liquid chamber 34 can be controlled more effectively.

On the other hand, by employing the elastic support member 18 made of rubber, the sealing structure using an O-ring as in the conventional vibration isolator shown in FIG. 3 becomes unnecessary, and the manufacturing cost is reduced. .

The anti-vibration device according to the present embodiment has a control device 40 for operating the electromagnet 50 and a vibration sensor 42 for detecting the amplitude of the vibration of the vehicle body. The control device 40 drives the electromagnet 50 based on the amplitude.

Therefore, the electromagnet 50 is 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 is absorbed by the vibration isolator body 10 more reliably.

As described above, according to the present embodiment, transmission of engine vibration to the vehicle body side can be effectively prevented, and 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.

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. In addition, a well-known drive unit other than the electromagnet may be used as the actuator, for example, a piezo actuator may be used.

On the other hand, the above-described embodiment is employed in a vibration isolator having a structure in which an auxiliary liquid chamber is provided in addition to the pressure-receiving liquid chamber and the pressure-receiving liquid chamber and the auxiliary liquid chamber communicate with each other through an orifice serving as a restriction passage. You may. Further, an inter ring 2 serving as an intermediate member
2 is one in the above embodiment, but the same effect as in the above embodiment can be obtained even if a plurality of inter rings 22 are arranged in the elastic support member 18. It may be arranged.

On the other hand, in the embodiment, the purpose is to dampen an engine mounted on an automobile. However, the anti-vibration device of the present invention is 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.

[0049]

As described above, according to the present invention, there are excellent effects that the force of the actuator can be effectively used and the fluctuation of the internal pressure of the pressure receiving liquid chamber can be effectively controlled.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibration isolator according to an embodiment of the present invention.

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

FIG. 3 is a cross-sectional view of a first vibration isolator main body according to the related art.

FIG. 4 is a cross-sectional view of a second vibration damping device main body according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator main body 12 Lower mounting table (1st mounting member) 20 Movable plate (vibration member) 22 Inter ring (intermediate member) 26 Outer cylinder fitting (1st mounting member) 28 Elastic body 32 Upper mounting member (1st mounting member) 2 mounting member) 34 pressure receiving liquid chamber 50 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 another part of the partition of the pressure-receiving liquid chamber. A vibrating member formed of a rubber material, an outer peripheral side of which is connected to any one of the mounting members and an inner peripheral side of which is connected to the vibrating member to displace the vibrating member while sealing the pressure receiving liquid chamber. An elastic support member for supporting; an intermediate member for partitioning the elastic support member into a portion connected to any one of the attachment members and a portion connected to the vibration member; and a vibrating force for vibrating the vibration member. And the actuator that generates Anti-vibration apparatus according to symptoms. 2. A control device for operating the actuator, and a sensor for detecting an amplitude of a vibration of the vibration receiving unit, wherein the control unit controls the actuator based on an amplitude of the vibration of the vibration receiving unit detected by the sensor. The vibration isolator according to claim 1, wherein the vibration isolator is driven.