JPH05215176A - Liquid enclosure type vibration isolator - Google Patents

Abstract

PURPOSE:To reduce length of a vibration isolator in the axial direction by arranging a sub liquid cell outside in the radial direction of a bottomed cylindrical part having a pressure receiving liquid cell and constituting both liquid cells to communicate with each other by a restriction passage. CONSTITUTION:A small round-head part 20A which is the lower half of a cylinder 20 is fastened coaxially with an outer case 12, to the inside of a cup shape outer case 12 where the lower part of a cylinder part 14 is blocked by a bottom plate 16 integrally formed with the cylinder part 14. Thereafter, the upper of the cylinder 20 is blocked by vulcanization-adhering the outer periphery of an elastic body 24 on the inner periphery of an expanded part 20B which is the upper half of this cylinder 20, a cylindrical pressure liquid cell 30 is partitioned by the cylinder 20, the elastic body 24 and the bottom plate 16, and simultaneously, an annular sub liquid cell 32 is partitioned by the cylinder 20 and the outer case 12. Both liquid cells 30, 32 are communicated to each other through a restriction passage 38 of a restriction passage constituting member 34 fit in a sub liquid cell 21, and the restriction passage 38 is formed by providing a sectional C letter shape groove 36 in a specified range in the circumferential direction on a constitutional part 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device for use in automobiles, general industrial machinery, etc., which absorbs and dampens vibrations from a vibration generating portion.

[0002]

2. Description of the Related Art A vehicle is provided with a vibration isolator as an engine mount between an engine and a vehicle body to prevent transmission of engine vibration to the vehicle body.

In recent years, a liquid-filled type vibration damping device has been proposed as this type of vibration damping device, which can generate a large damping force that cannot be obtained only by an elastic body such as rubber.

An example of a conventional liquid-filled type vibration damping device used for an engine mount will be described with reference to FIG.

As shown in FIG. 11, this vibration isolation device 110
Has a bottom plate 112 having a recess formed in the center thereof, and a mounting bolt 114 is provided outside the center of the bottom plate 112.
Is erected.

The lower end of the outer cylinder 116 is caulked and fixed to the peripheral edge of the bottom plate 112, and the peripheral edge of the diaphragm 118 is sandwiched between the peripheral edge of the bottom plate 112 and the lower end of the outer cylinder 116.

The upper end of the outer cylinder 116 is an expanded portion 116B whose inner diameter is gradually enlarged, and the elastic body 1 is formed on the inner peripheral surface.
The outer periphery of 20 is vulcanized and adhered.

At the center of the elastic body 120, the support 12
4 is vulcanized and adhered. This support base 124 is a mounting portion of the engine, and mounting bolts 126 for fixing the engine.
Is erected.

A liquid chamber 128 is formed by the inner peripheral portion of the outer cylinder 116, the elastic body 120 and the diaphragm 118, and the inside is filled with liquid.

A partition member 130 is arranged in the liquid chamber 128 to divide the liquid chamber 128 into a pressure receiving liquid chamber 132 and a sub liquid chamber 134. The peripheral edge of the lower end of the partition member 130 is sandwiched between the peripheral edge of the bottom plate 112 and the lower end of the outer cylinder 116 via a diaphragm 118. Diaphragm 1
An air chamber 136 is formed between 18 and the bottom plate 112 and communicates with the outside air as necessary.

A groove 138 having a rectangular cross section is formed along the circumferential direction on the outer periphery of the partition member 130, and the elastic body 120 is formed.
Is closed by an extension portion of the restriction passage 140. The partition member 130 has one end of the restriction passage 140.
Is connected to the pressure receiving liquid chamber 132 via the opening 142, and the other end is connected to the auxiliary liquid chamber 134 via the opening 144.

The vibration isolator 110 is disposed below the engine and has a role of supporting the engine and preventing transmission of engine vibration to the vehicle body.

When the vibration of the engine is input to the vibration isolator 110, the elastic body 120 is deformed by the vibration and the pressure receiving liquid chamber 1
Pressure fluctuations occur within 32. The diaphragm 118 is deformed due to the change in the pressure of the liquid, and the liquid flows back and forth in the restriction passage 140, whereby a damping force is generated and the vibration of the engine is absorbed.

[0014]

By the way, in the vibration isolator 110, the elastic body 120, the pressure receiving liquid chamber 132, the partition member 130, the auxiliary liquid chamber 134 and the air chamber 136 are arranged in series in the axial direction. Further, since the diaphragm 118 and the elastic body 120 are deformed and moved in the axial direction, there is a limit in maintaining the vibration damping property and shortening the axial dimension.

In consideration of the above facts, an object of the present invention is to provide a liquid-filled type vibration damping device capable of shortening its axial dimension.

[0016]

A liquid-filled type vibration damping device of the present invention has a bottomed cylindrical portion connected to one of a vibration generating portion and a vibration receiving portion, and to the other of the vibration generating portion and the vibration receiving portion. A connecting member to be connected, an elastic body that is provided between the bottomed tubular portion and the connection member, closes an opening of the bottomed tubular portion, and deforms when vibration occurs, and the bottomed tubular shape A pressure receiving liquid chamber which is provided inside the portion and is capable of expanding and contracting with the elastic body as a part of a partition wall, a sub liquid chamber provided radially outside the bottomed tubular portion, the pressure receiving liquid chamber and the sub liquid. It is characterized by including a restricted passage communicating with the chamber.

[0017]

In the liquid filled type vibration damping device of the present invention, the sub liquid chamber is
Since it is arranged on the outer side in the radial direction of the bottomed cylindrical portion having the pressure receiving liquid chamber, compared to the conventional vibration damping device in which the elastic body, the pressure receiving liquid chamber and the sub liquid chamber are arranged in series in the axial direction, The axial dimension is less restricted by the constituent parts, and the axial length of the vibration isolator can be shortened.

Further, when the connecting member of the liquid filled type vibration damping device of the present invention is connected to the vibration generating part of the engine or the like and the bottomed tubular part is connected to the vibration receiving part of the vehicle body or the like, the load of the engine or the like is connected. It is supported by a vibration receiving portion such as a vehicle body via a member, an elastic body, and a bottomed tubular portion. When the vibration of the engine or the like is input to the liquid-filled type vibration damping device, the elastic body is deformed and a pressure change occurs in the pressure receiving liquid chamber. As a result, the liquid inside moves back and forth between the pressure receiving liquid chamber and the sub liquid chamber through the restriction passage, and a large damping force is generated in the liquid filled type vibration damping device, so that the vibration is effectively absorbed.

[0019]

【Example】

[First Embodiment] A first embodiment of the vibration isolator 10 according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
0 is provided with an outer case 12. This outer case 1
2 is a bottom plate 16 integrally formed with the cylindrical portion 14 at the lower side (direction of the arrow A in FIG. 1) of the cylindrical portion 14 whose axis is the vertical direction (direction of arrow A in FIG. 1 and direction opposite to the direction of arrow A). It is cup-shaped closed by. A mounting bolt 18 is erected on the outer central portion of the bottom plate 16, and the mounting bolt 18 is for fixing to a vehicle body of an automobile (not shown) as an example.

Inside the outer case 12, an inner cylinder 20 constituting the cylindrical portion of the bottomed cylindrical portion is arranged coaxially with the outer case 12. The lower half of the inner cylinder 20 is the outer case 12
The small cylindrical portion 20A has a smaller diameter than
The lower end of the small cylindrical portion 20A is in close contact with the bottom plate 16 of the outer case 12.

On the upper side of the small cylindrical portion 20A, there is integrally provided an expanding portion 20B as an opening whose diameter gradually increases. The outer periphery of the elastic body 24 is vulcanized and adhered to the inner periphery of the expanded portion 20B, and the upper portion of the inner cylinder 20 is closed by the elastic body 24.

At the center of the elastic body 24, a support base 26 as a connecting member is embedded and vulcanized and adhered. Support 26
Is an engine mounting portion (not shown), and mounting bolts 28 for fixing the engine are erected on the upper surface.

The peripheral portion of the expanded portion 20B of the inner cylinder 20 is caulked and fixed to the outer case 12 by bending the upper end of the outer case 12 inward.

A columnar space surrounded by the inner cylinder 20, the elastic body 24 and the bottom plate 16 is a pressure receiving liquid chamber 30, and an annular space between the inner cylinder 20 and the outer case 12 is a sub liquid chamber 32. Has been done. The pressure receiving liquid chamber 30 and the sub liquid chamber 32 are filled with a liquid such as ethylene glycol.

An umbrella orifice body 31 is arranged at the center of the pressure receiving liquid chamber 30. The umbrella orifice body 31 includes a substantially conical main body portion 31A having a diameter reduced toward the support base 26 side, and a small diameter portion 31B integrally provided at the center of the main body portion 31A. The front end of is embedded in and fixed to the lower part of the center of the support base 26.

The outer diameter of the main body portion 31A is the small cylindrical portion 20A.
Is smaller than the inner diameter of
An annular gap 3 is provided between the small cylindrical portion 20A and the main body portion 31A.
3 is formed.

An elastic body 35 for a stopper is vulcanized and adhered to the bottom surface of the main body portion 31A.

A limiting passage forming member 34 is disposed inside the sub liquid chamber 32. As shown in FIG. 2, the restricted passage forming member 34 is formed in a ring shape, and as shown in FIG. 1, the inner peripheral surface is the outer peripheral surface of the small cylindrical portion 20A and the outer peripheral surface is the inner peripheral surface of the cylindrical portion 14. The end face on the bottom plate 16 side is in close contact with the bottom plate 16.

A groove 36 having a substantially C shape when viewed from the axial direction is formed on the outer periphery of the restricted passage forming member 34, and the groove 36 is surrounded by the cylindrical portion 14 to form a restricted passage 38. ing.

As shown in FIG. 2, the restricted passage forming member 34.
Is formed at one end of the groove 36 in the longitudinal direction.
A through hole 40 is provided to penetrate through the groove 36 in the radial direction, and a notch 42 is provided above the other end of the groove 36.

As shown in FIG. 1, the small cylindrical portion 2 of the inner cylinder 20.
A hole 44 having a diameter larger than that of the through hole 40 is formed in the 0A at a position where the through hole 40 of the restricted passage constituting member 34 faces each other. The pressure receiving liquid chamber 30 and the auxiliary liquid chamber 32 are provided with the holes 4
4, the through hole 40, the restricted passage 38, and the notch 42 are always in communication.

As shown in FIGS. 1 and 3, the outer case 12
The cylindrical portion 14 is provided with a plurality of rectangular holes 46 above the restricted passage forming member 34. These rectangular holes 4
The diaphragm 6 is closed by a diaphragm 48. The diaphragm 48 has a peripheral edge portion vulcanized and adhered to the inner peripheral portion of the rectangular hole 50, and has a convex shape toward the sub liquid chamber 32.

Next, the operation of this embodiment will be described. In the vibration isolator 10 of the present embodiment, as an example, the outer case 12 is fixed to a vehicle body of an automobile (not shown) via mounting bolts 18,
The engine is mounted on a support 26 and fixed with mounting bolts 28.

The axial dimension of the vibration isolator 10 can be determined mainly by the thickness of the elastic body 24 and the amount of deformation and movement of the elastic body 24 toward the pressure receiving liquid chamber 30 side. That is, in the vibration isolator 10 of the present embodiment, unlike the conventional vibration isolator, the member for separating the pressure receiving liquid chamber 30 and the sub liquid chamber 32 does not exist in the axial direction of the pressure receiving liquid chamber 30, and the pressure receiving Since the restriction passage 38, which connects the liquid chamber 30 and the sub liquid chamber 32, the sub liquid chamber 32, and the diaphragm 48 are not arranged in the axial direction of the pressure receiving liquid chamber, the vibration isolator 10 of the present embodiment has a conventional structure. The axial dimension can be greatly reduced as compared with the vibration isolator.
Therefore, when the vibration damping device 10 of the present embodiment is used as a mount for an engine, the height of the engine can be kept low, and it can be arranged at a portion where the distance between the engine and the vehicle body is narrow.

Further, in the vibration isolator 10 of this embodiment, since the restriction passage 38 is provided outside the inner cylinder 20 forming the partition wall of the pressure receiving liquid chamber 30, the restriction passage is provided in the pressure receiving liquid chamber. Compared with the liquid-filled type vibration damping device of
Can be made large, and the axial dimension of the pressure receiving liquid chamber 30 is not increased even when the cross-sectional area of the restriction passage 38 is increased. Therefore, in the vibration damping device 10 of the present embodiment, it is possible to improve the damping force by increasing the longitudinal dimension of the limiting passage 38 and increasing the cross-sectional area of the limiting passage 38 without increasing the axial dimension. it can.

When engine vibration is input to the vibration isolator 10, the vibration is supported by the vehicle body through the support 26, the elastic body 24, the outer case 12 and the inner cylinder 20, and the resistance caused by the internal friction of the elastic body 24 is applied. Then, the vibration is effectively absorbed by the action of the damping force generated when the liquid moves back and forth between the pressure receiving liquid chamber 30 and the sub liquid chamber 32 through the limiting passage 38.

Further, since the vibration frequency is high, the limiting passage 38
In the case where is clogged, the liquid moves back and forth in the direction of the arrow B through the annular gap 33 between the small cylindrical portion 20A and the main body portion 31A and resonates, and the dynamic spring constant of the vibration isolator 10 is reduced. High frequency vibration is absorbed.

When excessive vibration is input to the vibration isolator 10, the elastic body 35 of the umbrella orifice body 31 contacts the bottom plate 16 and the amplitude is limited. [Second Embodiment] A second embodiment of the vibration isolator 10 according to the present invention will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 4 and 5, the limiting passage forming member 50 of this embodiment has a ring-shaped protrusion 52 formed on the inner peripheral side of the upper surface of the limiting passage forming member 34 of the first embodiment. Further, a pair of partition walls 54 extending in the radial direction are integrally formed on the upper surface of the restricted passage constituting member 50.
One of these partition walls 54 is provided at a position corresponding to a substantially intermediate portion between the cutout 42 and the through hole 40, and the other is provided on the opposite side with the axis line in between.

These partition walls 54 are used for the restricted passage forming member 5
The outer side in the radial direction of 0 is in close contact with the inner peripheral surface of the cylindrical portion 14 of the outer case 12, and the inner side in the radial direction is the expanded portion 2 of the inner cylinder 20.
0B and the outer peripheral surface of the small cylindrical portion 20A. In this embodiment, the partition wall 54 divides the sub liquid chamber 32 into two in the circumferential direction. As shown in FIG. 4, one corresponding to the notch 42 is the second sub liquid chamber 32B, and the other. Is the first sub liquid chamber 32A.

As shown in FIGS. 5 and 6, a C-shaped groove 56 is formed on the inner periphery of the protrusion 52. As shown in FIG. 4, the narrow groove 56 is formed in the small cylindrical portion 20 of the inner cylinder 20.
The second limiting passage 58 is surrounded by A. The cross-sectional area of the second restriction passage 58 is smaller than the cross-sectional area of the restriction passage 38.

One end of the second limiting passage 58 has a through hole 40.
Notch 60 penetrating to the upper surface of the projection 52 provided above the
Is connected to the first auxiliary liquid chamber 32A via the through hole, and the other end is connected to the pressure receiving liquid chamber 30 via a through hole 62 provided in the inner cylinder 20 near the notch 42.

Further, as shown in FIGS. 4 and 6, the diaphragm 48 of this embodiment is formed so that the side facing the second sub liquid chamber 32B is thicker than the side facing the first sub liquid chamber 32A. Therefore, the diaphragm 48 facing the second auxiliary liquid chamber 32B has higher rigidity against hydraulic pressure than the diaphragm 48 facing the first auxiliary liquid chamber 32A.

Like the vibration isolator 10 of the first embodiment, the vibration isolator 10 of this embodiment also has a member for separating the pressure receiving liquid chamber 30 and the sub liquid chamber 32, unlike the conventional vibration isolator. Pressure receiving chamber 30
Does not exist in the axial direction of the pressure receiving liquid chamber 30 and the auxiliary liquid chamber 3
Since the restriction passage 38, the sub-liquid chamber 32, and the diaphragm 48 that connect the two components are not arranged in the axial direction of the pressure-receiving liquid chamber, the size in the axial direction can be made significantly smaller than that of the conventional vibration isolator. You can

Further, since the vibration isolator 10 of this embodiment is provided with two restriction passages of different sizes, both high and low vibrations can be effectively absorbed. That is,
When the frequency of vibration is relatively low, the diaphragm 48 facing the first sub liquid chamber 32A is not deformed by the high rigidity diaphragm 48 facing the second sub liquid chamber 32B due to the pressure change of the pressure receiving liquid chamber 30. However, due to the action of the damping force generated when the liquid flows back and forth between the pressure receiving liquid chamber 30 and the first sub liquid chamber 32A via the second restriction passage 58 and passes through the second restriction passage 58, Vibrations of low frequency are effectively absorbed.

On the other hand, when the frequency of vibration is relatively high,
The second restriction passage 58 becomes clogged, but at this time, the second auxiliary liquid chamber 32B is caused by the pressure change of the pressure receiving liquid chamber 30.
The diaphragm 48 facing the front is deformed. For this reason, the liquid passes through the restriction passage 38 and the pressure receiving liquid chamber 30 and the second sub liquid chamber 32.
The liquid travels back and forth between B and B, and the liquid resonates in the liquid passage in the limiting passage 38, the dynamic spring constant is lowered, and the vibration of a relatively high frequency is effectively absorbed.

When the vibration frequency is higher and the restriction passage 38 is in a clogged state, the small cylindrical portion 20A.
The liquid moves back and forth in the direction of arrow B through the annular gap 33 between the main body portion 31A and the main body portion 31A and resonates, the dynamic spring constant of the vibration isolator 10 is reduced, and the vibration is absorbed.

When excessive vibration is input to the vibration isolator 10, the elastic body 35 of the umbrella orifice body 31 comes into contact with the bottom plate 16 to limit the amplitude. [Third Embodiment] A third embodiment of the vibration isolator 10 according to the present invention will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The inner cylinder 64 of this embodiment is different in shape from the inner cylinder 20 of the first embodiment. As shown in FIG. 7, the inner cylinder 64 is substantially cylindrical and the central portion in the axial direction is contracted. The diameter is an annular recess 64A. The outer periphery of the elastic body 24 is vulcanized and adhered to the inner peripheral surface of the inner cylinder 64 extending from the substantially central portion in the axial direction to the upper end.

The inner cylinder 64 is inserted into a cylindrical intermediate cylinder 66 having the same axial length.
Is inserted into the outer case 12 together with the inner cylinder 64.

The lower ends of the inner cylinder 64 and the intermediate cylinder 66 are in close contact with the bottom plate 16 of the outer case 12, and the upper ends thereof are the outer case 12.
Has an upper end portion thereof closely attached to the inner flange portion 12A bent inward. The outer circumference of the inner cylinder 64, except for the annular recess 64A, is in close contact with the inner circumference of the intermediate cylinder 66.

Between the annular recess 64A and the intermediate cylinder 66,
A partition member 68 is provided. As shown in FIG. 8, the partition wall member 68 has a ring shape, and a projection 68A is provided on the lower surface thereof. As shown in FIG. 7, the partition member 68 has an inner periphery closely attached to the bottom surface of the annular recess 64A and an outer periphery closely attached to the inner periphery of the intermediate cylinder 66. As a result, the space between the annular recess 64A and the intermediate cylinder 66 is partitioned in the up-down direction, and the upper side serves as the sub liquid chamber 70.

Further, the space below the partition wall member 68 serves as a restriction passage 72, and as shown in FIG.
2 has a C-shape when viewed in the axial direction by the projection 68A of the partition wall member 68 being in close contact with the annular recess 64A and the intermediate cylinder 66.

One end of the restriction passage 72 in the longitudinal direction is connected to the sub liquid chamber 70 via the notch 74 of the partition member 68, and the other end thereof is connected to the pressure receiving liquid chamber 30 via the hole 76 provided in the annular recess 64A. It is connected.

The outer case 12 of this embodiment is not provided with the diaphragm 48, and the diaphragm 48 is provided in the rectangular hole 78 of the intermediate cylinder 66 facing the sub liquid chamber 70. Like the diaphragm 48 of the first embodiment, the diaphragm 48 of the present embodiment is also convex toward the sub liquid chamber 70,
The space between the diaphragm 48 and the outer case 12 is an air chamber 80. The air chamber 80 may be communicated with the outside air if necessary.

When the vibration of the engine is input to the vibration isolator 10, the vibration is resistance due to the internal friction of the elastic body 24, and the liquid moves between the pressure receiving liquid chamber 30 and the sub liquid chamber 70 through the limiting passage 72. It is effectively absorbed by the action of the damping force generated at the time. When the vibration frequency is high and the restriction passage 72 is clogged, the liquid moves back and forth in the annular gap 33 in the direction of arrow B to resonate, and the dynamic spring constant of the vibration isolator 10 is reduced to reduce the frequency. High vibration is absorbed.

When excessive vibration is input to the vibration isolator 10, the elastic body 35 of the umbrella orifice body 31 comes into contact with the bottom plate 16 to limit the amplitude.

Like the vibration isolator 10 of the first embodiment, the vibration isolator 10 of the present embodiment also has a member for separating the pressure receiving liquid chamber 30 and the sub liquid chamber 70, unlike the conventional vibration isolator. Pressure receiving chamber 30
Does not exist in the axial direction of the pressure receiving liquid chamber 30 and the auxiliary liquid chamber 7
Since the restriction passage 72, the sub-liquid chamber 70, and the diaphragm 48 that connect to 0 are not arranged in the axial direction of the pressure-receiving liquid chamber, the size in the axial direction can be significantly reduced as compared with the conventional vibration isolator. You can [Fourth Embodiment] A fourth embodiment of the vibration isolator 10 according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The limiting passage forming member 34 of this embodiment is arranged near the upper end of the small cylindrical portion 20A, and the lower side of the limiting passage forming member 34 is the sub liquid chamber 32. Correspondingly, the notch 42 is provided below the restricted passage forming member 34, and the diaphragm 48 is also formed near the bottom plate 16 of the outer case 12.

As shown in FIG. 10, a vibrating body supporting cylinder 82 is inserted inside the inner cylinder 20, and the lower end portion of the vibrating body supporting cylinder 82 is bent outward in the semi-annual direction.
The bottom plate 16 of the outer case 12 and the lower end of the inner cylinder 20 are in close contact with each other and sandwiched.

Inside the cylinder 20, a vibrating body 84 is arranged at the center in the radial direction. The vibrating body 84 is formed in a substantially disc shape, and the outer peripheral portion and the cylinder 20 are connected by a ring-shaped elastic body 86. In the present embodiment, a space between the elastic body 24 and the vibrating body 84 is a pressure receiving liquid chamber, and a space between the vibrating body 84 and the bottom plate 16 is an air chamber 88.
The air chamber 88 may be communicated with the outside air if necessary.

A recess 84A is provided in the center of the lower surface of the vibrating body 84, and the bottom plate 16 is provided with a recess 16A at a portion facing the recess 84A.

An actuator 90 is provided in the recess 16.
Is attached. The actuator 90 is provided with an annular coil 92 and an iron core 94 arranged in the central portion of the annular coil 92, and by applying a current to the annular coil 92, the iron core 94 moves in the axial direction. It has become. The iron core 94 is attached to the vibrating body 84 via the shaft 95.
Is linked to.

The annular coil 92 is connected to the control device 98 by a conductor (not shown). Further, a pressure sensor 96 is provided inside the pressure receiving liquid chamber 30, and the pressure sensor 96 is provided with a control device 98 by a lead wire (not shown).
Is linked to.

The control device 98 can detect the magnitude of the internal pressure of the pressure receiving liquid chamber 30 by the pressure sensor 96, and controls the current flowing through the annular coil 92 based on the pressure detection signal of the pressure sensor 96. You can

When the vibration frequency is relatively low, the diaphragm 4 of the sub liquid chamber 32 is changed by the pressure change of the pressure receiving liquid chamber 30.
8 is deformed, and the liquid receives the pressure receiving liquid chamber 30 through the limiting passage 38.
The low-frequency vibrations are effectively absorbed by the resistance that passes between the secondary liquid chamber 32 and the sub liquid chamber 32 and passes through the restriction passage 38.

On the other hand, when the vibration frequency is relatively high,
The restriction passage 38 becomes clogged, but at this time, based on the detection signal of the pressure sensor 96, the actuator 90 is operated to move the vibrating body 84 to move the pressure receiving liquid chamber 3
It is possible to suppress an increase in pressure within 0, that is, an increase in the dynamic spring constant. For example, when the elastic body 24 moves downward to increase the internal pressure of the pressure receiving liquid chamber 30, the control device 98 prevents the internal pressure of the pressure receiving liquid chamber 30 from increasing based on the detection signal of the pressure sensor 96. Then, the vibrating body 84 is moved downward. Further, when the elastic body 24 moves upward and the internal pressure of the pressure receiving liquid chamber 30 is about to decrease, the control device 98 prevents the internal pressure of the pressure receiving liquid chamber 30 from decreasing based on the detection signal of the pressure sensor 96. Then, the vibrating body 84 is moved downward. As a result, the vibration isolation device 10 of the present embodiment
In the above, the dynamic spring constant does not increase even when high frequency vibration is input, and the high frequency vibration is effectively absorbed.

If the vibration frequency is higher, the liquid moves back and forth in the direction of the arrow B through the annular gap 33 between the small cylindrical portion 20A and the main body portion 31A, and the vibration of the vibration isolator 10 is moved. The spring constant is reduced and the vibration is absorbed.

The actuator 90 of this embodiment is
By passing an electric current through the annular coil 92,
4 has a structure in which it moves in the axial direction.
The actuator 90 is not limited to the configuration of this embodiment as long as the actuator can be moved in the axial direction.

In the first to fourth embodiments, the liquid filled type vibration damping device of the present invention is used as an engine mount, but the present invention is not limited to this, and the liquid filled type vibration damping device of the present invention is used. It goes without saying that the device may be used for a body mount, a general industrial machine, or the like.

[0072]

As described above, in the liquid-filled type vibration damping device of the present invention, the auxiliary liquid chamber is arranged outside the bottomed cylindrical portion having the pressure receiving liquid chamber in the radial direction. It has an excellent effect that the dimension in the axial direction can be made shorter than that of the vibration isolator.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the axis of a vibration damping device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a partition member of the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 3 is a perspective view showing an outer case of the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 4 is a sectional view taken along the axis of a vibration control device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a partition member of a vibration isolator according to a second embodiment of the present invention.

FIG. 6 is a vibration isolator 6 of FIG. 4 according to a second embodiment of the present invention.
FIG. 6 is a sectional view taken along line -6.

FIG. 7 is a sectional view taken along the axis of a vibration damping device according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a partition member of a vibration isolator according to a third embodiment of the present invention.

FIG. 9 is a vibration isolation device 9 according to a third embodiment of the present invention shown in FIG.
FIG. 9 is a sectional view taken along line -9.

FIG. 10 is a sectional view taken along the axis of a vibration control device according to a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along the axis of a vibration isolation device according to a conventional example.

[Explanation of symbols]

 10 Liquid-filled type vibration damping device 16 Bottom plate (bottomed cylindrical portion) 20 Inner cylinder (bottomed cylindrical portion) 20B Expanded portion (opening) 24 Elastic body 26 Supporting base (connecting member) 30 Pressure receiving liquid chamber 32 Sub Liquid chamber 32A First sub-liquid chamber 32B Second sub-liquid chamber 38 Restriction passage 50 Second restriction passage 70 Sub-liquid chamber 72 Restriction passage

Claims (1)

[Claims] 1. A bottomed tubular portion connected to one of the vibration generating portion and the vibration receiving portion, a connecting member connected to the other of the vibration generating portion and the vibration receiving portion, the bottomed tubular portion and the An elastic body that is provided between the connecting member and that closes the opening of the bottomed tubular portion and that is deformed when vibration occurs, and the elastic body that is provided inside the bottomed tubular portion as part of the partition wall. A pressure receiving liquid chamber that can be expanded and contracted, a sub liquid chamber that is provided on the outer side in the radial direction of the bottomed tubular portion, and a restriction passage that connects the pressure receiving liquid chamber and the sub liquid chamber. Liquid-filled anti-vibration device.