JPH10184772A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability with manufacturing cost reduction by permitting a small type actuator to be used. SOLUTION: A partitioning member 24 is disposed at the inside of a supporting cylinder 16 to which an elastic body 18 is vulcanizingly-bonded, and a space partitioned by the partitioning member 24 and the elastic body 18 forms a pressure receiving fluid chamber 26. A small-diametrical recessed part 42 is formed on the upper part side of the partitioning member 24, a large- diametrical recessed part 44 is disposed at the lower part side of the partitioning member 24, and a circular through-hole 46 communicates with a space between the small-diametrical recessed part 42 and the large-diametrical recessed part 44. A driving disc 50 is fixed at the front end of a rod 48A extending upward from an actuator unit 48, and the driving disc 50 is positioned in the large- diametrical recessed part 44. A membrane 54 is disposed in the small-diametrical recessed part 42, and a space which is sealed by being sandwiched between the driving disc 50 and the membrane 54 forms a driving force transmitting fluid chamber 56.

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 preventing transmission of vibration from a member that generates vibration, and is applicable to, for example, a case where transmission of vibration from an engine mounted on a vehicle is prevented. Things.

[0002]

2. Description of the Related Art For example, an anti-vibration device as an engine mount is disposed between an engine of a vehicle serving as a vibration generating portion and a vehicle body serving as a vibration receiving portion. There is known a structure that absorbs vibration and prevents vibration from being transmitted to the vehicle body.

That is, as an example of the vibration isolator, there are a pressure-receiving liquid chamber whose internal volume changes due to deformation of an elastic body, a movable plate serving as a partition of the pressure-receiving liquid chamber, an actuator for vibrating the movable plate by electromagnetic force, and the like. A control type anti-vibration device having a structure as described above is known.

When an engine (not shown) mounted on the vibration isolator operates to generate vibration, the vibration is absorbed by the deformation of the elastic body, and the movable plate is vibrated by the electromagnetic force generated by the actuator. Vibration is absorbed without increasing the liquid pressure in the pressure receiving liquid chamber.

[0005]

However, in such a control type vibration isolator, the size of the clearance between the movable plate and the actuator greatly affects the performance of the vibration isolator such as reliability. However, with this structure, it is difficult to control the clearance accuracy.

Further, a voice coil or an electromagnet can be generally used as the actuator.
It has the following disadvantages.

That is, in the actuator using the voice coil, a large voice coil is required to generate a large power to vibrate the movable plate, and a large space is required for installing the voice coil. Increase in size. Also, in the case of an actuator using an electromagnet, the size of the actuator becomes large and the structure becomes complicated due to the vibration of the movable plate, and the manufacturing cost of the vibration isolator increases.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vibration damping device that can employ a miniaturized actuator and that has reduced manufacturing costs and improved reliability.

[0009]

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 disposed between the pair of mounting members and elastically deformable, and a liquid filled with the elastic body as a part of the partition wall, and the inner volume changes due to deformation of the elastic body. A pressure receiving liquid chamber, a driving force transmitting liquid chamber in which liquid is sealed and disposed adjacent to the pressure receiving liquid chamber, and a movable partition disposed between the pressure receiving liquid chamber and the driving force transmitting liquid chamber to movably partition the pressure receiving liquid chamber and the driving force transmitting liquid chamber. The wall, a part of the partition wall of the driving force transmitting liquid chamber, and a driving wall having a larger area than the movable wall, and a reciprocating motion of the driving wall may cause pressure fluctuation in the driving force transmitting liquid chamber. And an actuator.

According to a second aspect of the present invention, in the first aspect, the actuator is connected to control means for controlling driving of the actuator in accordance with a vibration input from the vibration generating unit. And

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.

A movable wall disposed between the driving force transmitting liquid chamber and the pressure receiving liquid chamber divides them so as to be movable, and a driving wall having a larger area than the movable wall is a partition wall of the driving force transmitting liquid chamber. Form part of Further, the actuator can reciprocate on the driving wall to generate pressure fluctuation in the driving force transmitting liquid chamber.

For this reason, the actuator reciprocates on the driving wall to generate pressure fluctuation in the driving force transmitting liquid chamber, whereby the driving force of the actuator is transmitted to the movable wall, and
The movable wall can be reciprocated.

Accordingly, the liquid pressure, which is 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 change in the liquid pressure in the pressure receiving liquid chamber is suppressed, and the vibration of the vibration receiving portion is suppressed. When the actuator reciprocates on the movable wall portion so as to reduce the amplitude, the engine vibration is further absorbed, and the vibration is more difficult to be transmitted to the vibration receiving portion side.

As described above, according to the present invention, there is no space for transmitting the electromagnetic force between the movable wall portion, which is a movable plate, and the actuator, so that precision control of clearance is not required.
In addition, since the movable wall is not vibrated by the electromagnetic force, it is not necessary to employ a large-sized actuator. Accordingly, the vibration isolator can be downsized and the structure can be simplified. Manufacturing cost is reduced.

As a result, it is possible to obtain an anti-vibration device which employs a miniaturized actuator and has high reliability while suppressing the manufacturing cost.

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, the actuator is connected to control means for controlling the driving of the actuator in accordance with the input of the vibration.

Therefore, the control means for controlling the driving of the actuator in accordance with the input of the vibration drives the actuator, so that the vibration can be absorbed more reliably.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 3, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1 showing the present embodiment, the outer frame of the vibration isolator main body 10 is formed by a cylindrical outer cylinder fitting 12 as a first mounting member. Is provided with a bolt 14 for connecting and fixing the vibration isolator main body 10 to a vehicle body (not shown), which is a vibration receiving portion. A support cylinder 16 formed in a cylindrical shape whose central portion in the axial direction has a smaller diameter by one step is disposed at the upper portion on the inner peripheral side of the outer cylinder fitting 12.

On the inner peripheral surface of the support cylinder 16 near the upper side,
A rubber elastic body 18 having a cylindrical shape is vulcanized and bonded, and a central portion on the upper side of the elastic body 18 is vulcanized and bonded to a top plate 20 serving as a second mounting member. A bolt 22, which is used as a vibration generating portion and is used to connect an engine (not shown), projects upward from the center of the top plate 20.

A cylindrical partition member 24 is disposed at a position below the elastic body 18 and across the space while being fitted inside the support cylinder 16.
This space defined by the elastic body 18 and the elastic body 18 constitutes a pressure receiving liquid chamber 26, in which a liquid such as water or oil is sealed.
Therefore, the elastic body 18 and the partition member 24 constitute a partition wall of the pressure receiving liquid chamber 26 in which the liquid is sealed.

The partition member 24 can be manufactured by integral molding of a synthetic resin, a metal such as aluminum, or the like. The lower part of the partition member 24 projects outward, and the lower part of the partition member 24 is in contact with the lower part of the support cylinder 16.

Further, on the outer peripheral surface of the partition member 24,
A groove 30 is formed along the circumferential direction of the partition member 24, and one end of an orifice 32, which is a passage formed by the groove 30 and the inner peripheral surface of the support cylinder 16, extends upward to the pressure-receiving liquid chamber 26. The other end is connected to a hole 16A passing through the support cylinder 16. And this orifice 32
Is a restriction passage for absorbing shake vibration.

Between the outer cylinder fitting 12 and the support cylinder 16,
A cylindrical plate 34 formed in a thin cylindrical shape is arranged so as to cover the support cylinder 16 over the entire circumference.
A rubber diaphragm 36 is vulcanized and bonded to the inside of the cylinder 4, and the diaphragm 36 is installed inside the cylindrical plate 34. The diaphragm 36 covers the entire outer periphery of the support cylinder 16 including a portion corresponding to the hole 16A, which is the opening end of the orifice 32.

For this reason, the space between the inner peripheral surface of the diaphragm 36 and the outer peripheral surface of the reduced diameter portion of the support cylinder 16 is connected to the sub-liquid chamber that communicates with the pressure-receiving liquid chamber 26 through the orifice 32. The space between the outer peripheral surface side of the diaphragm 36 and the inner peripheral surface side of the outer cylinder fitting 42 is an air chamber 40, which allows the diaphragm 36 to be deformed.

Further, on the upper side of the partition member 24, a small-diameter concave portion 42 which is a circular concave portion is formed, and on the lower side of the partition member 24, a large-diameter concave portion having a larger diameter than the small-diameter concave portion 42 is formed. The diameter concave portion 44 is arranged coaxially with the small diameter concave portion 42, and a small diameter circular through hole 46 communicates between the bottom surface of the small diameter concave portion 42 and the bottom surface of the large diameter concave portion 44.

On the other hand, an actuator unit 48 composed of a small electromagnet is disposed at a position above the outer cylindrical metal fitting 12 and coaxial with the large-diameter concave portion 44. By stopping, the actuator unit 48 is fixed on the upper side of the outer tube fitting 12.

The actuator unit 48
A drive disk 50, which is a circular drive wall, is fixed to the tip of a rod 48A extending upward from the drive disk 50, and the drive disk 50 is located in the large-diameter recess 44. Further, between the outer peripheral portion of the driving disk 50 and the inner wall surface of the large-diameter concave portion 44, rubber elastic rings 52 which are respectively vulcanized and bonded thereto are arranged. Therefore, this elastic ring 52
However, while the large-diameter concave portion 44 is vertically partitioned and sealed at the portion of the driving disk 50, the driving disk 50 can reciprocate vertically by elastic deformation.

In the small-diameter concave portion 42, a membrane 54 which is a rubber elastic film and is a movable wall portion is disposed by being vulcanized and bonded to the inner wall surface of the small-diameter concave portion 42. Partition the small diameter recess 42 up and down.
The area of the membrane 54 is, for example, about 1/3 of the area of the driving disk 50,
A large deformation of the membrane 54 is possible only by moving the zero small.

The space sealed between the driving disk 50 and the membrane 54 constitutes a driving force transmitting liquid chamber 56, and like the pressure receiving liquid chamber 26, liquid such as water, oil, etc. It is enclosed. As described above, the membrane 54 is disposed between the pressure receiving liquid chamber 26 and the driving force transmitting liquid chamber 56 and movably partitions them.

Further, the actuator unit 48 is connected to a controller 60 as control means, and the drive of the actuator unit 48 is controlled by a current from the controller 60, so that the rod 48A reciprocates.

The controller 60 is operated by a vehicle power supply, detects the rotation speed and rotation angle of the engine based on a crank signal from the engine crank, and determines when idle vibration or shake vibration is generated, and when the vibration is generated. You can now judge.

Next, the operation of the present embodiment will be described. When the engine mounted on the top plate 20 operates, vibration of the engine is transmitted to the elastic body 18 via the top plate 20. The elastic body 18 acts as a vibration absorbing body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 18.

Further, when the vibration from the engine is a shake vibration of a relatively low frequency, the pressure-receiving liquid chamber 26 and the sub-liquid chamber 38 whose inner volumes change as the elastic body 18 and the diaphragm 36 deform. Of the liquid flow through the orifice 32, and the vibration damping effect based on the viscous resistance of the liquid flow generated in the orifice space and the liquid column resonance improves the vibration-proof effect and absorbs the shake vibration.

The driving force transmitting liquid chamber 56 and the pressure receiving liquid chamber 26
A driving disk 50 having a larger area than the membrane 54 forms a part of a partition wall of the driving force transmitting liquid chamber 56. further,
The actuator unit 48 reciprocates on the driving disk 50 to generate pressure fluctuation in the driving force transmitting liquid chamber 56.

For this reason, the actuator unit 48 reciprocates on the driving disk 50 to generate pressure fluctuations in the driving force transmitting liquid chamber 56, whereby the actuator unit 4
8 is transmitted to the membrane 54 and the membrane 5
4 can be reciprocated while being elastically deformed in the vertical direction.

In other words, when the vibration from the engine is an idle vibration of a relatively high frequency, the orifice 32 having a large passage resistance is clogged, and the orifice 32 in the pressure receiving liquid chamber 26 is deformed as the elastic body 18 is deformed. Fluid pressure is about to fluctuate. However, at this time, the actuator unit 48 reciprocates the membrane 54 so as to suppress the change in the liquid pressure in the pressure receiving liquid chamber 26 and reduce the amplitude of the vibration of the vehicle body.
The idle vibration is absorbed, and the vibration is hardly transmitted to the vehicle body.

More specifically, the controller 60 determines whether or not idle vibration has occurred based on the crank signal. If it is determined that idle vibration has occurred, the controller 60 operates as follows.

First, as the vibration of the engine is input to the vibration isolator main body 10 and the top plate 20 rises in the direction of the arrow in FIG. 2, the volume of the pressure receiving liquid chamber 26 increases, and the pressure receiving liquid chamber 26 expands. When the elastic body 18 is deformed so that the hydraulic pressure in the inside decreases, the controller 60 drives the actuator unit 48 based on the crank signal, and the actuator unit 48 raises the driving disk 50 to drive the driving force transmitting liquid chamber 56. Increase pressure inside. As a result, the actuator unit 48
Is transmitted to the membrane 54, and the membrane 54 expands upward as shown in FIG.
The reduction of the hydraulic pressure in 6 is alleviated.

Next, as the top metal fitting 20 descends in the direction of the arrow in FIG. 3, the elastic body 18 is moved so that the volume of the pressure receiving liquid chamber 26 decreases and the liquid pressure in the pressure receiving liquid chamber 26 increases. When deformed, the controller 60 drives the actuator unit 48 based on the crank signal, and the actuator unit 48 descends the driving disk 50 to move the driving force transmitting liquid chamber 56.
Decrease pressure inside. As a result, the driving force of the actuator unit 48 is transmitted to the membrane 54, and accordingly, the membrane 54 is depressed downward as shown in the figure, and the rise in the liquid pressure in the pressure receiving liquid chamber 26 is reduced.

Thereafter, when the volume of the pressure receiving liquid chamber 26 is increased again, the controller 60 makes the same judgment as described above, and
Is returned to the position shown in FIG.
The above operation is continuously repeated, and the membrane 54 vibrates so as to reciprocate up and down.

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 the engine speed, that is, a change in the frequency of the engine vibration. The pressure rise in the pressure receiving liquid chamber 26 can be suppressed. For this reason, the vibration isolator of the present embodiment can reliably absorb vibration over a wide range of frequencies.

Further, in the vibration isolator of the present embodiment, the membrane 54 as the movable plate and the actuator unit 4
Since there is no space for transmitting the electromagnetic force between the clearance 8 and the clearance 8, there is no need to control the clearance accuracy. Further, since the structure does not have a structure in which the membrane 54 is vibrated by the electromagnetic force, it is not necessary to employ a large-sized actuator, and accordingly, the vibration isolator can be downsized and the structure can be simplified. Manufacturing costs will be reduced.

On the other hand, the area of the membrane 54 is
0, which is about one-third of the area of 0, and enables a large deformation of the membrane 54 with a small amount of movement of the driving disk 50.
The operation does not cause a problem even if is adopted.

As a result, according to the present embodiment, a vibration isolator having improved reliability can be obtained while adopting a miniaturized actuator unit 48 while suppressing the manufacturing cost.

In the vibration isolator according to the present embodiment, the actuator unit 48 is connected to a controller 60 that controls the driving of the actuator unit 48 in accordance with the input of vibration. Since the drive is performed, the vibration is more reliably absorbed.

In this embodiment, the purpose of the present invention is to dampen an engine mounted on a vehicle. Needless to say, the damping device of the present invention can be used for other purposes. Is not limited to the embodiment.

Further, in this embodiment, the actuator unit 48 constituted by a small electromagnet is employed as an actuator, but other driving means such as a voice coil may be employed.

In the above-described embodiment, the outer cylinder fitting 12 as the first attachment member is attached to the vehicle body, and the top plate 20 as the second attachment member is attached to the engine. It may be.

[0051]

As described above, the anti-vibration device of the present invention has a configuration as described above. As a result, it is possible to employ a miniaturized actuator, thereby suppressing the manufacturing cost and increasing the reliability.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of an embodiment of the vibration isolator according to the present invention, in which a driving disk is raised.

FIG. 3 is a cross-sectional view of one embodiment of the vibration isolator according to the present invention, in which the driving disk is lowered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator main body 12 Outer cylinder fitting (1st mounting member) 18 Elastic body 20 Top plate fitting (2nd mounting member) 26 Pressure receiving liquid chamber 48 Actuator unit (actuator) 50 Driving disk (driving wall part) 54 Membrane (Movable wall) 56 driving force transmitting liquid chamber 60 controller (control means)

Claims (2)

[Claims] A first mounting member connected to one of the vibration generating section and the vibration receiving section; a second mounting member connected to the other of the vibration generating section and the vibration receiving section; and a pair of these mounting members. An elastic body disposed between the elastic body and the elastic body, a pressure-receiving liquid chamber in which the liquid is sealed with the elastic body as a part of the partition wall, and whose internal volume changes due to deformation of the elastic body; a pressure-receiving liquid chamber in which the liquid is sealed and A driving force transmitting liquid chamber disposed adjacent to the pressure transmitting liquid chamber; a movable wall portion disposed between the pressure receiving liquid chamber and the driving force transmitting liquid chamber to movably partition the driving force transmitting liquid chamber; A vibration isolator, comprising: a driving wall portion having a larger area than the movable wall portion; and an actuator capable of reciprocating the driving wall portion to cause pressure fluctuation in the driving force transmitting liquid chamber. . 2. An anti-vibration device according to claim 1, wherein the actuator is connected to control means for controlling the driving of the actuator in accordance with the input of the vibration from the vibration generator.