JPH10252814A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a vibration control characteristic by appropriately arranging a valve and an actuator. SOLUTION: In this device, a passage forming member 28 is arranged inside an intermediate cylinder fitting 16, and a space, which is partitioned by the passage forming member 28 and an elastic body 18, forms a main liquid chamber 30. An upper side of the passage forming member 28 is formed with a recessed part 34, and a bottom surface of the recessed part 34 is formed, with a circular through hole 36, and connected to an idle orifice 42. In the recessed part 34, a valve element 50, to which a connecting shaft 54 is connected, is arranged so as to face to a main liquid chamber 30. A part of the connecting shaft 54 close to the lower end thereof passes through an elastic film 56, which partitions a space inside of a bottom plate fitting 12 to an upper air chamber 60 and a lower air chamber 62. The elastic film 56 is pinched between pinching plates 58A, 58B, and a coil spring 68 for energizing the pinching plates 58A, 58B and the elastic film 56 upward is arranged between the bottom surface of the bottom plate fitting 12 and the pinching plate 58B.

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 is a structure in which a main liquid chamber and a sub liquid chamber are provided inside, and these liquid chambers are communicated with each other by a restriction passage serving as an orifice. When the mounted engine operates and generates vibration, the vibration is absorbed by the liquid column resonance of the liquid in the restriction passage communicating with the liquid chambers and the transmission of the vibration is stopped. I have.

[0004] On the other hand, the vibration frequency becomes wide with the wide operating state of the engine. Therefore, in order to maintain the vibration isolating characteristics even in such vibrations of a wide range of frequencies, restriction passages having different lengths and inner diameters,
In recent years, an on-off valve which is a valve for opening and closing at least one of these restriction passages and an anti-vibration device provided with an actuator for opening and closing this on-off valve have been proposed in recent years.

[0005]

In such an anti-vibration device, as shown in, for example, Japanese Patent Application Laid-Open No. 4-331835, an actuator utilizing a negative pressure of an intake manifold of an engine is provided on the side of the auxiliary liquid chamber. A structure in which the actuator is arranged and the on-off valve is opened and closed by this actuator is conceivable.
However, in this structure, the deformation capacity of the diaphragm for changing the volume of the sub-liquid chamber is not sufficiently secured due to the obstruction of the on-off valve, so that the vibration-proof performance due to the liquid column resonance cannot be exhibited. There is a possibility that the function may be adversely affected.

On the other hand, when a restricting passage is formed and an opening / closing valve is arranged in a partition member for separating the main liquid chamber and the sub liquid chamber, and the partition member has a function of opening and closing the restricting passage, the opening / closing valve may be, for example, It is conceivable to arrange an actuator for driving in the vertical direction in the auxiliary liquid chamber or the air chamber. However, in such a structure, the original function of the diaphragm that separates the sub liquid chamber from the air chamber may not be secured due to the hindrance of the actuator. For this reason, the auxiliary liquid chamber and the air chamber and the actuator are independent of each other,
These need to be placed where there is no space problem.

The present invention has been made in view of the above circumstances, and has as its object to provide an anti-vibration device having improved anti-vibration characteristics by arranging valves and actuators at appropriate positions.

[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 disposed between the pair of mounting members, and a main liquid chamber in which a liquid is sealed using the elastic body as a part of the partition wall and the inner volume of the main liquid chamber changes due to deformation of the elastic body. A plurality of restriction passages, each of which communicates with the main liquid chamber and at least a part of the partition is formed so as to be deformable; and at least one of the plurality of restriction passages facing the main liquid chamber. A valve arranged to open and close this restricted passage,
An actuator connected to the valve and opening and closing the valve by a negative pressure.

According to a second aspect of the present invention, in the vibration isolator according to the first aspect, an air chamber is disposed adjacent to the sub-liquid chamber, and a diaphragm forms a partition between the sub-liquid chamber and the air chamber. The sub liquid chamber and the air chamber are arranged to surround the outer periphery of the main liquid chamber.

The operation of the vibration isolator according to claim 1 will be described below. When vibration is transmitted from the vibration generating unit connected to any of the attachment members, the elastic body is deformed and the vibration is attenuated by the elastic body. With the deformation of the elastic body, the inner volume of the main liquid chamber changes, and at least a part of the partition wall is formed of a plurality of restriction passages communicating between the sub liquid chamber and the main liquid chamber. A pressure change occurs in the liquid in any one of the restriction passages, and the partition wall of the sub liquid chamber communicating with the main liquid chamber is deformed.

As a result, when the vibration is transmitted from the vibration generating section, the vibration is attenuated not only by the elastic body but also by the liquid in the restriction passage between the main liquid chamber and the sub liquid chamber, and the vibration is received. Vibration is hardly transmitted to the part side.

Further, when the frequency of vibration from the vibration generating section changes, and in the restricted passage, for example, vibration in a high frequency range that cannot be reduced is transmitted, the valve is opened and closed by a negative pressure in accordance with this. The moving actuator operates to open and close the valve facing the main liquid chamber, and this opening and closing movement reduces such vibrations by the newly opened restriction passage. Absorbed.

Further, by arranging the valve so as to face the main liquid chamber, when the valve is closed, the valve is self-sealed even if the internal pressure of the main liquid chamber is greatly increased, and the valve floats up and is careless. Will not be open to the public.

Further, by disposing the valve facing the main liquid chamber and opening and closing the valve by the negative pressure of the actuator,
When the valve is closed, even if the internal pressure of the main liquid chamber is reduced to a negative pressure that is set to a maximum of -1 atm with respect to the atmospheric pressure, the structure can be made such that the valve floats and is not opened carelessly.

On the other hand, by arranging the valve at an appropriate position as described above, the valve does not become an obstacle in the vibration isolator, and the deformation capacity of the diaphragm for changing the volume of the auxiliary liquid chamber can be sufficiently ensured. Vibration isolation performance due to liquid column resonance can be exhibited, and the vibration isolation characteristics of the vibration isolation device are improved.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same effect as the first embodiment. However, in the present invention, the air chamber is disposed adjacent to the sub liquid chamber, a diaphragm forms a partition between the sub liquid chamber and the air chamber, and the sub liquid chamber and the air chamber are the main liquid chamber. It has a configuration arranged to surround the outer circumference.

Therefore, by arranging the sub liquid chamber and the air chamber on the outer peripheral side of the main liquid chamber, a space for properly arranging the actuator in the vibration isolator is ensured, and accordingly, the actuator is not obstructed by the actuator. In addition, the function of the diaphragm that separates the sub liquid chamber from the air chamber can be secured.

That is, by arranging the actuator at an appropriate position as described above, the anti-vibration characteristics can be further improved.

[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 5, and this embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2 showing this embodiment, a dish-shaped bottom plate 12 as a first mounting member is formed on the lower side of the vibration isolator 10. Is provided with a bolt 14 for connecting and fixing the vibration isolator 10 to a vehicle body (not shown). A flange portion 12A is provided outside the bottom plate metal fitting 12, and an intermediate cylindrical metal fitting 16 having a cylindrical shape with a central portion in the axial direction having a one-step diameter is disposed above the flange portion 12A. ing.

On the inner peripheral surface of the upper part of the intermediate cylindrical fitting 16,
The lower side of the rubber-made elastic body 18 having a cylindrical shape is vulcanized and bonded, and the center of 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 used for connecting an engine (not shown) projects upward from the center of the top plate fitting 20.

A cylindrical passage forming member 28 is disposed below the elastic body 18 and at a position sandwiching the space with the elastic body 18 while being fitted inside the intermediate cylindrical fitting 16. The space defined by the elastic body 18 and the passage forming member 28 constitutes a main liquid chamber 30, in which a liquid such as water or oil is sealed. Therefore, these intermediate cylinder fittings 1
6. The partition of the main liquid chamber 30 in which the liquid is sealed is constituted by the elastic body 18 and the passage forming member 28. still,
The passage forming member 28 can be manufactured by integral molding of a synthetic resin, a metal such as aluminum, or the like.

Further, on the upper side of the passage forming member 28,
A concave portion 34 is formed such that the bottom surface is circular, and a circular through hole 36 having a smaller diameter than the concave portion 34 is formed on the bottom surface of the concave portion 34 and at a position substantially coaxial with the concave portion 34. Have been.

On the other hand, an idle orifice 42 which is a large-diameter passage extending in the radial direction of the passage forming member 28 is formed in the passage forming member 28, and one end of the idle orifice 42 is formed in the circular through hole 36. It is connected to the bottom. The idle orifice 42 also penetrates the intermediate cylindrical member 16, and the other end of the idle orifice 42 is connected to the outer peripheral surface of the intermediate cylindrical member 16. The idle orifice 42 becomes a restriction passage for absorbing idle vibration.

On the other hand, as shown in FIGS. 1 and 2, a groove 38 is formed on the outer peripheral surface of the passage forming member 28.
One end of a shake orifice 44, which is a passage formed by the groove 38 and the inner peripheral surface of the intermediate cylindrical member 16, extends upward and is connected to the main liquid chamber 30. . The other end of the shake orifice 44 penetrates through the intermediate tube fitting 16, and the shake orifice 44
Is connected to the outer peripheral surface of the intermediate tube fitting 16. Then, the shake orifice 44 becomes a restriction passage for absorbing shake vibration.

On the outer peripheral side of the intermediate cylindrical member 16, an outer cylindrical member 24 formed in a cylindrical shape so as to cover the entire intermediate cylindrical member 16 is arranged. This outer tube fitting 24
The lower end of the bottom plate is caulked to the outer peripheral portion of the flange portion 12A of the bottom plate metal fitting 12, and the upper end side is caulked to the upper end of the intermediate cylindrical metal fitting 16 so as to be sandwiched by the outer cylindrical metal fitting 24. The intermediate tube fitting 16 is joined to the fitting 12.

A thin and elastically deformable rubber diaphragm 26 is vulcanized and bonded to the inside of the outer tube fitting 24, and the diaphragm 26 is installed inside the outer tube fitting 24. The diaphragm 26 covers the outer peripheral side portion of the intermediate cylindrical fitting 16 including the portions corresponding to the open ends of the idle orifice 42 and the shake orifice 44.

For this reason, the space between the inner peripheral surface side of the diaphragm 26 and the outer peripheral surface of the small-diameter portion of the intermediate cylindrical fitting 16 is formed by the idle orifice 42 and the shake orifice 4.
4 and a sub-liquid chamber 32 which communicates with the main liquid chamber 30 through the outer peripheral surface of the diaphragm 26 and the outer cylinder fitting 2.
The space between the inner peripheral surface 4 and the inner peripheral surface side is an air chamber 40, which facilitates the deformation of the diaphragm 26.

On the other hand, a valve body 50, which is a disc-shaped valve, is disposed in the recess 34 so as to face the main liquid chamber 30.
The valve body 50 which is a contact portion of the valve body 50 with the bottom surface of the concave portion 34
A seal member 52 formed of an elastic material such as a rubber material is arranged in a ring shape on the lower surface of the circular hole so as to surround the open end of the circular through hole 36. For this reason, the sealing material 52 is
The sealing at the time of the contact of the valve body 50 with the bottom surface of the valve is ensured.

A connecting shaft 54 is screwed and connected to the center of the lower surface side of the valve body 50. The connecting shaft 54 penetrates the passage forming member 28 in the middle of the connecting shaft 54 in the vertical direction. O-ring 53 arranged at
The sealing between the connecting shaft 54 and the passage forming member 28 is ensured while the connecting shaft 54 is movable in the axial direction.

A portion near the lower end of the connecting shaft 54 penetrates a thin rubber elastic film 56 disposed in the bottom plate 12. Further, the elastic film 56 is sandwiched between a pair of holding plates 58A and 58B firmly fitted to the connecting shaft 54 so as not to be shifted with respect to the connecting shaft 54.

At a position between the bottom of the bottom plate 12 and the lower surface of the passage forming member 28 and coaxial with the bottom plate 12, there is provided a cylindrical fitting 59 having a cylindrical shape and an upper portion formed in a flange shape. The elastic film 56 is arranged so as to partition the space inside the bottom metal fitting 12, and the outer peripheral end of the elastic film 56 is adhered to the inner peripheral surface of the cylindrical metal fitting 59 over one circumference. For this reason, the elastic film 5 whose outer peripheral end is adhered to the inner peripheral surface of the cylindrical fitting 59 is provided.
6, the space in the cylindrical metal fitting 59 is divided into an upper air chamber 60 and a lower air chamber 62 which are a pair of air chambers.

A communication hole 66 for communicating between the upper air chamber 60 and the outside of the vibration isolator 10 is formed on a side surface of the bottom metal fitting 12. A pair of holding plates 5 are provided between the bottom surface and the holding plate 58B.
8A, 58B and a coil spring 68 for urging the elastic film 56 upward are arranged. In other words, when the pair of holding plates 58A, 58B and the elastic film 56 are urged by the coil spring 68 to move upward or downward, they are moved through the not-shown holes provided in the cylindrical metal fitting 59. Thus, the communication hole 66 allows the air in the upper air chamber 60 to escape or is taken in from the communication hole 66, so that the pair of sandwiching plates 58A and 58B and the elastic film 56 do not hinder vertical movement.

As described above, the connection shaft 54, the elastic film 5
6. The holding plates 58A and 58B, the lower air chamber 62, and the coil spring 68 constitute an actuator 100 that opens and closes the valve body 50.

One end of a pipe 78 is connected to the bottom of the bottom metal fitting 12, and the other end of the pipe 78 is connected to a switching valve 82 which accommodates a coil 84 wound around a bobbin 85 as shown in FIGS. It is connected to the connection pipe 80.

A plunger 86 is movably disposed at the center of the coil 84 of the switching valve 82.
A coil spring 92 is provided between the proximal end of the plunger 86 and the suction element 94 which is also installed at the center of the coil 84.
Is arranged. A triangular pyramid-shaped packing 86A is attached to the tip side of the plunger 86.
The outside air communication pipe 88 connected to the atmosphere side can be closed by a packing 86A.

For this reason, the connection pipe 80 and the outside air communication pipe 8
The atmosphere-side passage 96 that penetrates through the lower air chamber 62 and communicates with the atmosphere can be blocked by the packing 86A.

On the other hand, the inner wall surface of the bobbin 85 and the plunger 8
6, a gap is formed, and the suction element 94
A packing (not shown) is arranged on the surface facing the plunger 86, and a through hole 94A is formed in the suction element 94. A connection pipe 90 connected to the intake manifold 76 on the intake side of the engine.
Is connected to one end of the suction element 94, and the through hole 94A and the intake manifold 76 are communicated.

For this reason, a negative pressure side passage which communicates between the lower air chamber 62 and the intake manifold 76 through the gap between the connecting pipe 80, the inner wall surface of the bobbin 85 and the plunger 86 and the through hole 94A of the suction element 94. 98, plunger 8
6 can be shut off by contact with the suction element 94.

As described above, the switching valve 82 constitutes a three-port two-position switching valve which is an electromagnetic valve which operates electromagnetically. When no voltage is applied to the coil 84, the switching valve 82 is shown in FIG. As described above, the plunger 86 is
2, the packing 86A closes the atmosphere side passage 96, and the negative pressure side passage 98 is opened because the valve stroke L occurs. On the other hand, when a predetermined voltage is applied to the coil 84, as shown in FIG. 5, the plunger 86 is attracted to the attraction element 94 by the electromagnetic force generated by the coil 84 while resisting the urging force of the coil spring 92. The packing 86 </ b> A at the tip of the tip 86 escapes to open the atmosphere-side passage 96, and the valve stroke L becomes 0 to close the negative-pressure side passage 98.

On the other hand, the coil 84 of the switching valve 82 is connected to a control circuit 70 which is a control means for judging the driving condition of the vehicle and turning on / off the applied voltage. The control circuit 70 is driven by a vehicle power supply and determines at least a vehicle speed sensor 72 and an engine speed sensor 7 for determining a driving state of the vehicle.
4, the vehicle speed and the engine speed can be detected. This allows the control circuit 70 to determine whether idle vibration or shake vibration has occurred, that is, whether the vehicle is running or stopped.

Accordingly, the switching circuit 82 is controlled by the control circuit 70.
Between the position where the valve body 50 is raised and the idle orifice 42 is opened, and the position where the valve body 50 is lowered and the idle orifice 42 is closed. By switching the position of the body 50,
The idle orifice 42 is opened and closed.

Specifically, when the coil 84 of the switching valve 82 is energized, the negative pressure generated by the intake manifold 76 is cut off. As a result, the inside of the lower air chamber 62 is communicated with the atmosphere side and becomes atmospheric pressure,
The connection shaft 54 is pushed up by the coil spring 68, and the valve body 5
0 is moved upward.

As a result, as shown in FIG. 4, the valve body 50 is released from the bottom surface of the concave portion 34 to open the idle orifice 42, and the main liquid chamber 30 and the sub liquid chamber 32 are separated through the idle orifice 42. And the idle orifice 42 can attenuate vibration.

On the other hand, when the energization of the coil 84 of the switching valve 82 is stopped, the communication with the lower air chamber 62 with the atmosphere side is cut off, and the intake manifold 7 is closed.
Communicate with 6. For this reason, the air pressure in the lower air chamber 62 is reduced to negative pressure, and the valve body 50 is moved downward as the holding plates 58A, 58B and the connecting shaft 54 move downward.

As a result, as shown in FIG. 1, when the valve orifice 50 abuts against the bottom surface of the concave portion 34, the idle orifice 42 is closed, and the main liquid chamber 30 and the sub liquid chamber 3 are closed.
2 is not communicated with the idle orifice 42.

That is, as shown in FIG. 4, the valve body 50 is connected to the main liquid chamber 30 and the sub liquid chamber 32 through the idle orifice 42.
And a closed state in which the main liquid chamber 30 and the sub liquid chamber 32 do not communicate with each other as shown in FIG. become.

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, with the deformation of the elastic body 18,
The internal volume of the main liquid chamber 30 changes, and a part of the partition wall is deformed by the diaphragm 26. The liquid in the orifices 42 and 44 communicating between the sub liquid chamber 32 and the main liquid chamber 30 is pressurized. A change occurs and the diaphragm 26 deforms.

As a result, when the vibration from the engine side is transmitted, not only the elastic body 18 but also the main liquid chamber 30 and the sub liquid chamber 3
Vibration is attenuated by viscous resistance of the flow of liquid in the orifices 42 and 44 between them and the damping action based on liquid column resonance and the like, and it becomes difficult to transmit the vibration to the vehicle body side.

The valve 50 is provided in the recess 34 to which the idle orifice 42 is connected so as to face the main liquid chamber 30 in addition to the normally open shake orifice 44. I do.

The specific operation will be described below. For example, when the vehicle runs, shake vibration (less than 15 Hz) occurs. The control circuit 70 determines from the vehicle speed sensor 72 and the engine speed sensor 74 that shake vibration is occurring, does not apply a voltage to the coil 84 of the switching valve 82, and as shown in FIG. Is communicated with the intake manifold 76.

As a result, the air pressure in the lower air chamber 62 is reduced to a negative pressure, and the valve body 50 is moved downward while resisting the urging force of the coil spring 68 as shown in FIG. When the valve body 50 comes into contact with the bottom surface of the concave portion 34, the idle orifice 42 is closed, and the main liquid chamber 30 and the sub liquid chamber 32 are communicated only by the shake orifice 44. As a result, the liquid vigorously moves in and out of the shake orifice 44 and receives a passage resistance, or the liquid column resonates, thereby absorbing the shake vibration.

On the other hand, for example, when the vehicle stops, the engine is idling and idle vibration (20 to 40 Hz) having a high vibration frequency is generated. In this case, the shake orifice 44 becomes clogged. At this time, the control circuit 70 determines from the vehicle speed sensor 72 and the engine speed sensor 74 that idle vibration has occurred, and applies a voltage to the coil 84 of the switching valve 82. Is applied, the plunger 86 is sucked as shown in FIG. 5, and the inside of the lower air chamber 62 communicates with the atmosphere.

As a result, the pressure in the lower air chamber 62 becomes the same as the atmospheric pressure, and as shown in FIG.
With the movement of the connection shaft 54 pushed up by 8, the valve body 50 is moved upward. Then, the valve body 50 is separated from the bottom surface of the concave portion 34 to open the idle orifice 42, and the main liquid chamber 30 and the sub liquid chamber 32 communicate with each other through the idle orifice 42, and the liquid flows through the idle orifice 42. Will be able to

As a result, the liquid resonates in the liquid in the idle orifice 42 and the dynamic spring constant of the vibration isolator 10 is reduced, and the idle vibration is absorbed.

As described above, when the vehicle is running and when it is stopped,
Although the frequency of the vibration generated by the engine is different from each other, the difference in the frequency can be handled by switching the air pressure in the lower air chamber 62 by operating the switching valve 82. That is, by connecting the lower air chamber 62 to the atmosphere side or to the intake manifold 76 by the switching valve 82, the characteristics of the vibration isolator 10 can be changed, and the vibration can be absorbed over a wide frequency range.

Further, by disposing the valve element 50 facing the main liquid chamber 30, when the valve element 50 is closed,
Even if the internal pressure of the valve body greatly increases, the valve body 50 becomes self-sealed, so that the valve body 50 does not float up and is inadvertently opened.

Further, the valve element 50 is disposed so as to face the main liquid chamber 30, and the valve element 50 is opened and closed by a negative pressure, whereby the valve element 50 is opened.
Is closed, the internal pressure of the main liquid chamber 30 decreases and becomes a negative pressure that is a maximum of -1 atm with respect to the atmospheric pressure.
It is also possible to adopt a structure in which the valve body 50 does not float and is inadvertently opened.

That is, when the top plate 20 is pulled upward as shown by the arrow A when the valve body 50 is closed, the internal pressure of the main liquid chamber 30 becomes negative, Is at most -1 atm relative to atmospheric pressure. Therefore, as shown in FIG. 1, if the area S2 of the holding plates 58A and 58B is made much larger than the area S1 of the valve body 50, the negative pressure of the intake manifold 76 can be increased. The closed state of the idle orifice 42 by the valve body 50 is ensured against the negative pressure of the liquid chamber 30.

On the other hand, as described above, the valve body 50 is connected to the main liquid chamber 30.
By disposing the valve body 50 at an appropriate position, the valve body 50 does not become an obstacle in the vibration isolator 10 and the diaphragm 26 that changes the volume of the sub liquid chamber 32 is deformed. A sufficient capacity can be ensured, and the vibration isolation performance of the liquid column resonance is exhibited, so that the vibration isolation characteristics of the vibration isolation device 10 are improved.

Further, in the present embodiment, an air chamber 40 is arranged adjacent to the sub-liquid chamber 32, and a diaphragm 26 forms a partition between the sub-liquid chamber 32 and the air chamber 40. The chamber 32 and the air chamber 40 are arranged so as to surround the outer periphery of the main liquid chamber 30.

Therefore, by arranging the sub liquid chamber 32 and the air chamber 40 on the outer peripheral side of the main liquid chamber 30, a space for properly disposing the actuator 100 in the vibration isolator 10 is secured.
Accordingly, the function of the diaphragm 26 that separates the sub liquid chamber 32 from the air chamber 40 can be ensured without being obstructed by the actuator 100.

That is, as described above, the actuator 10
By arranging 0 at an appropriate position, the anti-vibration characteristics can be further improved.

Further, the voltage is not applied to the switching valve 82 while the engine is operating and the vehicle is running for a relatively long time, and the voltage is applied to the switching valve 82 while the vehicle is running for a relatively short time. Therefore, the initial performance of the switching valve 82 can be ensured.

Although the valve is a disk-shaped valve body 50 in the above embodiment, the valve may have another shape.
Further, in the above-described embodiment, the configuration is such that the side of the bottom plate fitting 12 as the first mounting member is attached to the vehicle body and the side of the top plate fitting 20 as the second mounting member is attached to the engine. However, the configuration may be reversed.

In the above 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.
Further, the shape and the like are not limited to those of the embodiment.

[0068]

As described above, the anti-vibration device of the present invention has the above-described configuration. As a result, it is possible to improve the anti-vibration characteristics by arranging the valve and the actuator at appropriate positions.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator according to an embodiment of the present invention at the time of shake.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view of the switching valve applied to one embodiment of the vibration isolator according to the present invention at the time of shake.

FIG. 4 is a cross-sectional view of the vibration isolator according to the embodiment of the present invention at the time of idling.

FIG. 5 is a sectional view of the switching valve applied to the embodiment of the vibration isolator according to the present invention at the time of idling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Bottom metal plate (first mounting member) 18 Elastic body 20 Top metal plate (second mounting member) 26 Diaphragm 30 Main liquid chamber 32 Sub liquid chamber 40 Air chamber 50 Valve (valve) 100 Actuator

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. A main liquid chamber in which a 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 sub-liquid chamber which is communicated with each other and at least a part of the partition is formed so as to be deformable; a valve which faces the main liquid chamber and is arranged in at least one of the plurality of restriction passages to open and close the restriction passage; And an actuator connected to the actuator and opening and closing the valve by a negative pressure. 2. An air chamber is disposed adjacent to the auxiliary liquid chamber,
2. A vibration isolator according to claim 1, wherein a diaphragm is formed between the auxiliary liquid chamber and the air chamber by a diaphragm, and the auxiliary liquid chamber and the air chamber are arranged so as to surround an outer periphery of the main liquid chamber. apparatus.