JPS63172034A - Liquid sealed vibration isolator - Google Patents

Abstract

PURPOSE:To absorb torsional vibrations in a wide range by circumferentially arranging driving and driven parts alternately, connecting them to each other by means of elastic bodies, and providing liquid chambers which expand and contract respectively by a relative rotation between the driving and driven parts, and connecting these liquid chambers to each other by restricted passages. CONSTITUTION:A spider mounted to a driving shaft and a driven shaft is attached to the crosswise facing arms 18, 20 and 22, the arms 18, 20 are locked to the inside periphery of a ring 32 press-fit in an outer cylinder 34, and the arms 18, 20, 22 are elastically connected together by filling the inside of the outer ring 34 with elastic bodies 36 such as rubber, etc. Further, cavities 38 are provided between the heads of the arm 22 and the inner periphery of the ring 32, whereas liquid chambers 40, 42 filled with water, oil, etc., are formed between the arms 18, 20 and both heads of the arm 22, and the liquid chambers 40, 42 are mutually connected by restricted passages 48. Thus, when one pair of liquid chamber expand, the other pair of liquid chamber contract through the restricted passages 48 by a relative rotation between the driving shaft and driven shafts, so that torsional vibrations in a wide range can be absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid-filled vibration isolator that can be used as a joint for an automobile steering coupling, an axle shaft, etc., or a torsional damper.

[Background technology] In general, as a steering coupling for an automobile, a spider is attached to the opposing part of the drive shaft and the driven shaft, these are crossed in a cross shape, and a thread is wound between the drive part and the driven part. It is in the shape of a disc with these parts enclosed in rubber.

It is desirable that such a coupling has the role of transmitting steering torque to the gearbox, absorbing high frequency vibrations at small torsion angles, and absorbing low frequency vibrations at large torsion angles.

However, conventional steering couplings are only capable of absorbing high-frequency vibrations at small torsional angles, and are unable to absorb low-frequency vibrations at large torsional angles. This is because the loss factor of rubber is insufficient for low frequency vibrations (
(approximately 0.2).

The present invention takes the above-mentioned facts into consideration and aims to provide a liquid-filled vibration isolator that can absorb vibrations over a wide range of frequencies.

[Summary and operation of the invention] The vibration isolating device according to the present invention includes a plurality of driving parts and a plurality of driven parts arranged alternately at intervals in the circumferential direction and connected by an elastic body,
A liquid chamber that can be expanded and contracted by the relative rotation of the driving part and the driven part is provided between these, and the liquid chamber that expands and the liquid chamber that contracts during the relative rotation are communicated through a restriction passage.

Therefore, in the present invention, the elastic body between the driving part and the driven part mainly absorbs high-frequency vibrations, and large-amplitude low-frequency vibrations are absorbed by the passage resistance of the liquid passing through the restriction passage. ing. At low frequency and large amplitude, the driving part and the driven part rotate largely relative to each other, so when one liquid chamber between the driving part and the driven part contracts, the other liquid chamber expands, which reduces the amount of liquid passing through the restricted passage. movement is facilitated, thereby ensuring absorption of vibrations.

[Embodiment of the Invention] FIGS. 1 to 4 show a vibration isolating device according to a first embodiment of the present invention.

As shown in FIG. 4, this vibration isolator ε has a spider 12 attached to the tip of the drive shaft lO and a spider 16 attached to the tip of the driven shaft 14, which face each other in a cross shape, and these arms 18, 20, 22 It can be attached to.

That is, the arm 22 has its central portion located at the axis of the vibration isolator, and mounting holes 24 are formed near both ends extending in the radial direction, and the driven shaft 14 is fixed with bolts 26. It looks like this.

On the other hand, the arms 18, 20 are respectively arranged on the opposite side of the arm 22, and the mounting hole 28 is located at the mounting hole 24 from the axis of the vibration isolator.
are equidistant from each other. The spider 12 is fixed to these mounting holes 28 by bolts 30.

The arm 18.20 is fixed to the inner periphery of a ring 32 which is arranged coaxially with the axis of the vibration isolator.

This ring 32 is an outer cylinder 3 that forms the outer peripheral shape of the vibration isolator.
It is press-fitted into 4.

This outer cylinder 34 is filled with an elastic body 36 such as rubber, thereby elastically connecting the arms 18, 20 and 22. This elastic body 36 has an arm 22
A gap 38 is provided between the tip of the ring 32 and the ring 32 to facilitate relative rotation between the arms 18.20 and 22.

A gap is formed in the elastic body 36 between the arm 18 and one end of the arm 22, extending from the outer periphery toward the axial direction of the vibration isolator, and a first liquid chamber filled with a liquid such as water or oil. 4
It is 0. A similar second liquid chamber 42 is also formed between the arm 18 and the other end of the arm 22. As shown in FIG. 3, these first liquid chamber 40 and second liquid chamber 42
A notch 44 is formed in the axially central portion of the ring 32 in the portion where the ring 32 is formed, and thereby the first liquid chamber 40 and the second liquid chamber 42 reach the inner circumference of the outer cylinder 34.

An O-ring 46 is disposed over the entire circumference between the ring 32 and the outer cylinder 34 in order to isolate the first liquid chamber 40 and the second liquid chamber 42 from the outside.

A first liquid chamber 40 and a second liquid chamber 4 centered on the arm 18 portion
As shown in FIG. 2, a restriction passage 48 is formed in the outer circumference of the ring 32 between the two. This restricted passage 48
Both ends thereof open to the first liquid chamber 40 and the second liquid chamber 42, respectively, and serve as an orifice that communicates both liquid chambers through a small cross-sectional area. Therefore, these first liquid chambers 4
0. In FIG. 1, when the arm 18 rotates clockwise relative to the arm 22 due to rotation of the drive shaft, the second liquid chamber 42 receives a compressive force, and the first liquid chamber 40 receives a tensile force. Therefore, the liquid in the second liquid chamber 42 or the restriction passage 48
The liquid is forcibly delivered to the first liquid chamber 40 through the liquid chamber 40.

Further, a first liquid chamber 40 and a second liquid chamber 42 are similarly provided between the arms 20 and 22, and are communicated with each other through a restriction passage 48. These first liquid chamber 40 and second liquid chamber 42
are symmetrical with respect to the axis of the vibration isolator, and are provided between drive shafts and driven shafts that are arranged alternately in the circumferential direction of the vibration isolator.

Next, the operation of this embodiment will be explained.

Attach the drive shaft 10 to the tip of the steering shaft,
Attach the driven shaft 14 to the rotating shaft leading to the gearbox,
The vibration isolator of this embodiment is connected between these.

The steering torque acting on the drive shaft 10 is transmitted through the elastic body 36.
is transmitted to the arm 22 via. Since the steering operation speed is low, the driven shaft 14 rotates together with the drive shaft 10.

On the other hand, if high-frequency vibrations are applied to the steering system due to vehicle running vibrations, the elastic body 36 absorbs the vibrations by internal friction.

Further, if low frequency vibration is applied due to large relative rotation between the drive shaft IO and the driven shaft 14, the restriction passage 48 absorbs this vibration. That is, in FIG. 1, due to the relative rotation between the arms 18, 20 and 22, the pressure in one of the first liquid chamber 40 and the second liquid chamber 42 increases, and the pressure in the other decreases, so that the liquid flows through the restriction passage 48. This low-frequency vibration is absorbed, creating a large loss factor.

Next, FIGS. 5 to 8 show a vibration isolating device according to a second embodiment of the present invention.

In this embodiment, the arm 1 in the first embodiment is
Connecting threads 50 are interposed between the arms 8 and the arms 22 and between the arms 20 and the arms 22, respectively. That is, these connecting threads 50 connect one end of the arm 18 and the arm 22 and the arm 20 and the arm 22 on opposite sides of the first liquid chamber 40.
The other end of the arm 18 and the arm 22 on the opposite side via the second liquid chamber 42 are connected to one end of the arm 20 and the arm 22. The intermediate portion thereof passes through the elastic body 36 as shown in FIG. The elastic body 36 and the connecting thread 50 may be bonded together by vulcanization.

Therefore, in this embodiment, as shown in FIG.
With a tensile strength of 0, the torsional torque with the anti-vibration bag increases, and a vibration-isolating device that does not twist beyond a certain angle can be obtained. Therefore, if used as a steering coupling, it can make the turning angle of the tire more sensitive when turning the steering wheel, improving the maneuverability of the vehicle, and the damping effect of the liquid can effectively reduce unpleasant tire vibrations, such as shimmy, when driving at high speeds. It can be suppressed.

Furthermore, since the relative torsion angle is limited compared to the case without threads, the strain on the elastic body is reduced and durability is improved.

FIG. 9 shows a third embodiment of the present invention, which is a modification of the second embodiment. That is, the connecting thread 50 of this embodiment
Is arm 2 wrapped in a ring shape multiple times in advance?
Hook 52 and arm 18.20 protruding from both ends of 2
The hook 54 is formed on both sides of the hook. As a result, the ease of assembly is improved compared to the previous embodiment.

Next, FIGS. 10 to 12 show a vibration isolating device according to a fourth embodiment of the present invention.

In this embodiment, the cross-sectional area of the portion corresponding to the restriction passage 48 in the first embodiment is made larger, so that the passage 4
8A, and a moving member 56 is disposed within this passage 48A. This moving member 56 has an arcuate shape along the longitudinal axis of the passage 48A, and is capable of relative movement by a slight amount in the axial direction of the passage 48A. In order to limit this relative movement, the first liquid chamber 40. An enlarged diameter portion 58 is formed at the tip portion that protrudes into the second liquid chamber 42 .

Further, a groove is formed on the outer circumferential portion of the moving member 56 to form a restriction passage 60, which communicates the first liquid chamber 4o and the second liquid chamber 42 with each other.

Is the vibration isolator in this example similar to the above-mentioned examples in terms of vibrations having a large torsion angle at low frequencies?
It is designed to absorb high-frequency small torsional angle vibrations. In other words, when high-frequency vibration of a certain frequency occurs, the liquid in the restriction passage 60 resonates and becomes clogged, so the liquid pressure in the first liquid chamber 40 and the second liquid chamber 42 rises and becomes dynamic. This increases the torsional spring constant and causes a decline in vibration isolation performance. Therefore, when high frequency and small torsional angle vibration occurs, the moving member 56 moves a small amount to move the first chamber 40,
It is possible to suppress the pressure increase in the second liquid chamber 42 and prevent the dynamic spring constant from increasing.

In addition, the vibration -
Since the amount of liquid movement per rotation is larger than the high frequency small torsional angular vibration, the movement of the moving member 56 is restricted by the enlarged diameter portion 58, and sufficient liquid flows into the restriction passage 60 to obtain large damping. can.

In this embodiment, the restriction passage 60 may be provided not only on the outer circumference of the movable member 56 but also on the inner circumference or side surface of the movable member 56, or may be made to penetrate inside the movable member 56. Further, the restricted passage 60 may have a meandering shape in which the axis is largely bent. Further, instead of this restriction passage 60, a groove may be formed in a part of the outer cylinder 34 facing the moving member 56, and the first liquid chamber 40 and the second liquid chamber 42 are formed in the part not facing the moving member 56. A restricted passage may be provided to connect the two.

Further, the second liquid chamber 42 communicates with one of the pair of first liquid chambers 40 via the restriction passage 60, or the same effect can be obtained even if the second liquid chamber 42 communicates with the other first residue chamber 40. I can do it.

Next, FIGS. 13 to 15 show a fifth embodiment of the present invention. In this embodiment, the communication path between the first liquid chamber 40 and the second liquid chamber 42 is formed wider than in the previous embodiment and constitutes a part of the liquid chamber. Also, this first liquid chamber 40
A moving member 62 is disposed in the middle of the second liquid chamber 42 . As shown in FIG. 14, the movable member 62 has a lateral or rectangular shape with one end shaped like an arc, and grooves 64 are formed in the arc-shaped portion and both sides. A rib 66 projects from the arm 18.20 into this groove 64.
The movable member 62 is moved into the ml liquid chamber 40, the second
It is movable in the expansion/contraction direction of the liquid chamber 42 (left/right direction in FIG. 13). Further, the first liquid chamber 40 and the second liquid chamber 42 are communicated with the other first liquid chamber 40 and second liquid chamber 42 through a restriction passage 48 formed in the ring 32 on the opposite side of the moving member 62.

Therefore, this embodiment is similar to the previous embodiment, and during high-frequency vibration, the movable member 62, the groove 64, and the rib 66
It is possible to suppress the increase in the dynamic spring constant by slightly vibrating the size of the play.

Note that the structure for limiting the amount of movement of the moving member 62 may be reversed to the above, in which a pair of protrusions are protruded from the arm 18.20, and the moving member 62 can be moved between these protrusions.

Next, FIGS. 16 to 18 show a sixth embodiment of the present invention. In this embodiment, a partition plate 68 is attached in place of the moving member 62 of the previous embodiment to partition the first liquid chamber 40 and the second liquid chamber 42. A large number of small holes 70 are formed in the partition plate 68, and a pair of flexible membranes 72 are stretched across the partition plate 68 to separate the first liquid chamber 40 and the second liquid chamber 42 from the partition plate 68. It is divided.

This partition plate 68 can also be formed integrally with the outer cylinder 34. Further, another plate material can be fixed to the outer cylinder 34 so as not to be moved.

Also in this embodiment, the flexible membrane 72 can come into contact with and separate from the partition plate 68 during high frequency vibration, so the first liquid chamber 40
The pressure rise in the second liquid chamber 42 is suppressed, high frequency vibrations are absorbed, and the rise in dynamic spring constant is suppressed.

This flexible membrane 72 may have a canvas sandwiched therein in order to suppress deformation to a certain extent.

Next, FIGS. 19 to 21 show a seventh embodiment of the present invention.

In this embodiment, unlike the first embodiment, the arm 2
2 protrudes radially from the boss 73, and the boss 73 has a drive shaft mounting hole 74 at its axial center.

Further, the arms 18 and 20 are arranged toward the axis of the boss 73 in correspondence with the arms 22, and the first liquid chamber 40 and the first liquid chamber 40 are located between the arms 18 and 22, respectively. Two liquid chambers 42 are provided respectively and communicated through a restriction passage 48 within the elastic body 36.

Further, in this embodiment, a driven shaft is not provided, and a link-shaped mass 76 is press-fitted into the outer periphery of the outer cylinder 34 constituting the driven portion.

Therefore, in this embodiment, the rotational vibration of the drive shaft is transmitted to the first liquid chamber 40. The liquid in the second liquid chamber 42 is forcibly moved through the restriction passage 48, and by superimposing the resonance of the liquid within the restriction passage 4 days and the resonance of the mass 76, it becomes an effective torsional damper. It is possible to assign the role of

Next, FIGS. 22 to 26 show an eighth embodiment of the present invention.

In this embodiment, four arms 22 protrude from the outer periphery of the boss 80 to which the drive shaft is connected, as in the previous embodiment.
Four arms 1 extend from the ring-shaped mass 82 toward the axis.
8 protrudes, and an elastic body 36 is filled between the arms 18 and 22. Inside this elastic body 36 is an arm 1.
8 and the arm 22, a first liquid chamber 40 and a second liquid chamber 42 are formed, respectively. These first liquid chambers 40, second
The liquid chamber 42 is communicated with a restriction passage 48, which is the same as in each of the embodiments described above.

The first liquid chamber 40 and the second liquid chamber 42 are communicated with the outside through an opening provided in a part of the elastic body 36, as shown in FIG. 84 is crimped and closed. The lid 84 is secured to a plate 86 projecting radially from the boss 80 by seven flanges 88,90.

Therefore, in this embodiment as well, the same effects as in the previous embodiment can be obtained.

Next, a ninth embodiment of the present invention is shown in FIGS. 27 to 30. In this embodiment, the first liquid chamber 40 and the second liquid chamber 42
An insulating case 96 having a U-shaped cross section and an insulating case 98 that closes the U-shaped opening are interposed between the insulating case 96 and the insulating case 98 that closes the U-shaped opening. It has the role of a restriction passage 48 that communicates with the A pair of electrodes 100 are provided on opposing surfaces of the insulating case 96.
．． 102 are arranged facing each other. These electrodes Zo
o, 102 are conductive wires 100-1 as shown in FIG.
, 100-2, 102-1, 102-2. They are each connected to one pole and one pole of a battery 106 via a DC-DC converter 104, respectively. This battery 106
A switch 108 is interposed between the battery 106 and the battery 106.
can be electrically disconnected from the electrodes 100 and 102. Further, this switch 108 is turned on and off by a control device 110 to which signals from a vehicle speed sensor, a steering angle sensor, a lateral G sensor, a driving mode changeover switch, etc. are transmitted.

Furthermore, the first liquid chamber 40 and the second liquid chamber 42 in this embodiment
The liquid filled inside is an electrorheological fluid.

This electrorheological fluid
cfluid), for example, US Pat. No. 2,886,151;
It is also disclosed in No. 3047507, and is a fluid whose viscosity increases depending on the strength of the electric field.

The electrorheological fluid may include, for example, 40-60% silicic acid, 30-50% by weight low-boiling organic phase, 50-10% by weight organic phase.
A mixture of 5% by weight water and 5% by weight dispersion medium can be applied, e.g.
is applicable.

Therefore, in this embodiment, when a predetermined voltage is applied from the battery 106 between the electrodes 100 and 102, the electrorheological fluid in the restricted passage 48 increases its viscosity, and as the applied voltage increases further, the electrorheological fluid flows in the restricted passage 48. By solidifying the sexual fluid, the first liquid chamber 40 and the second liquid chamber 42 are completely blocked off.

For this reason, the present invention is suitable for the operation of low frequency vibrations, that is, lO~
When a low frequency vibration of about 2.07 is input, a predetermined voltage is applied to the electrodes 100 and 102 by the control device 110. This increases the viscosity of the fluid in the restriction passage 48, similar to when a highly viscous fluid passes through the restriction passage 48, and low frequency vibrations can be effectively absorbed. By adjusting this applied voltage, vibration damping can be easily adjusted.

When high-frequency vibrations of approximately 201.12 or higher are input, no voltage is applied between the electrodes 100 and 102. In this case, since the liquid in the restriction passage 48 has a low temperature, the cross-sectional area within the restriction passage 48 is large even if high-frequency vibrations are input, and clogging does not occur, and the dynamic spring constant can be kept low.

Further, when a high voltage is applied to the electrodes 100 and 102, the liquid in the restriction passage 48 solidifies, so that the liquid in the first liquid chamber 40 and the second liquid chamber
The liquid chambers 42 are completely cut off, making it difficult to change the volume of each liquid chamber. As a result, the static spring constant in the torsional direction becomes high, and the rotation angle of the steering wheel 112 can be transmitted to the gearbox without deviation.

Next, FIGS. 31 to 36 show a tenth embodiment of the present invention. In this embodiment, the hook of the electrode 116 is passed to the intermediate portion between the electrodes 100 and 102 of the insulating case 96 and 98 in the previous embodiment. As shown in FIG. 35, this electrode 116 is connected to conductive wires 116-1, 116-2.
The electrode 102 is connected to the battery 106 through the switch 118 and is connected to either the electrode 100 or one pole of the battery 106.
are each connected to one pole of battery 106 via switch 120.

Therefore, in this embodiment, the first liquid chamber 4o and the second liquid chamber 42 communicate with each other via the passage A between the electrode 116 and the electrode 100 and the passage B between the electrode 116 and the electrode 102. These passageways are capable of independently changing the viscosity of the electrorheological fluid. Note that the switches 118 and 120 are controlled by switch relays 122 and 124, respectively, shown in the fs34 diagram. This switch relay 122 may be provided between the DC-DC converter 104 and the battery 106.

Therefore, in this embodiment, 1014. When a low frequency vibration of about ~20i is input, switch 1 is activated as shown in Fig. 36.
With switch 18 turned on and switch 120 turned off, a voltage is applied between electrode 102 and electrode 116 to solidify the electrorheological fluid in the restricted passageway therebetween.

Therefore, the first liquid chamber 40,
This means that the second liquid chamber 42 is also in communication. Therefore, the throttling effect creates resistance to fluid flow between the first liquid chamber 40 and the second liquid chamber 42, and vibrations are absorbed.

In addition, when a vibration with a high frequency of 201 or more and a small relative angle is input, both switches 118 and 120 are turned off, and a wide restriction passage is created to prevent the first liquid chamber 40 and the second liquid chamber 40 from entering.
communicate. Therefore, this restricted passage is less likely to be clogged even by high-frequency vibrations, and high-frequency vibrations can be effectively absorbed.

Furthermore, if you want to transmit steering rotation accurately, turn on both switches 118 and 120, and the fluid between electrode 116 and electrode 100 and between electrode 116 and electrode 102 will coagulate, and the first The liquid chamber 40 and the second liquid chamber 42 are in a blocked state, and by increasing the static spring constant in the torsional direction, one rotation angle can be transmitted without deviation.

Note that the voltage applied to the electrodes in each of the above embodiments may be gradually changed to gradually change the viscosity accordingly.

[Effects of the Invention] As explained above, the present invention has a plurality of driving parts and a plurality of driven parts which are alternately arranged circumferentially apart and connected by an elastic body, and the driving parts and the driven parts are arranged between them. The liquid chambers are each provided with a liquid chamber that can be expanded or contracted by the relative rotation of , and the liquid chamber that expands and the liquid chamber that contracts during the relative rotation are communicated through a restricted passage, so that torsional vibrations can be absorbed over a wide range. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is an axis-perpendicular cross-sectional view showing a first embodiment of the vibration isolator according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 1. 4 is an exploded perspective view showing the first embodiment, FIG. 5 is an axis-perpendicular sectional view showing the second embodiment of the present invention, FIG. 6 is a sectional view taken along the line ■-■ in FIG. Fig. 7 is a sectional view taken along the line ■-■ in Fig. 5, Fig. 8 is a line diagram showing the relationship between torsion angle and torsion torque in the second embodiment, and Fig. 9 is a shaft diagram showing the third embodiment of the present invention. A right-angle sectional view, FIG. 1O is an axis-perpendicular sectional view showing the fourth embodiment of the present invention, and FIG.
I-X[1i! 12 is a cross-sectional view taken along the line ■-■ in FIG. 10; FIG. 13 is a cross-sectional view perpendicular to the axis showing the fifth embodiment of the present invention; FIG. 14 is a cross-sectional view taken along the summer single layer line in FIG. 13; FIG. 15 is a bi-biline sectional view of FIG. 13, and FIG. 16 is a sixth cross-sectional view of the present invention.
An axis-perpendicular sectional view showing the embodiment, FIG. 17 is the XW of FIG. 16.
-xvn! 1lit cross-sectional view, Figure 18 is the X [ of Figure 16]
-XvM line sectional view, Fig. 19 is an axis-perpendicular sectional view showing the seventh embodiment of the present invention, Fig. 20 is a xx-xX sectional view of Fig. 19, and Fig. 21 is XXI-XXI of Fig. 19. line cross section,
FIG. 22 is an axis-perpendicular cross-sectional view showing an eighth embodiment of the present invention, FIG. 23 is a cross-sectional view taken along the line XXI-XXI in FIG. 22, and FIG. 24 is a cross-sectional view taken along the line XW-XX! in FIG. 23. 25 is a sectional view taken along line XXV-XXV of No. 24[3], FIG. 26 is an exploded perspective view showing the eighth embodiment, and FIG. 27 is an axis-perpendicular view showing the ninth embodiment of the present invention. The sectional view, FIG. 28, is xxvi' of FIG. 27.
-xxvi line sectional view, Fig. 29 is XXII- of Fig. 27
XXIX line sectional view, FIG. 30 is a wiring diagram of the ninth embodiment, FIG. 31 is an axis-perpendicular sectional view showing the tenth embodiment of the present invention, and FIG. Cross-sectional view, Figure 33 is X XXII-X xXIIm of Figure 31
Figure 34 is a wiring diagram of the 1st O embodiment, Figure 35 is a wiring diagram showing the connection state between the electrode and battery of the IO embodiment, and Figure 36 is a diagram showing the energization state of the electrode and the restricted path. It is a chart showing an open/closed state. 10... Drive shaft, 14... Driven shaft. 18.20.22... Arm, 36... Elastic body, 40... First liquid chamber, 42... Second liquid chamber, 48... Restriction passage. Fig. 5 Fig. 6 Fig. 7 Fig. 24 Fig. 25 - Figure 34

Claims (1)

[Claims] (1) A plurality of driving parts and a plurality of driven parts are alternately arranged circumferentially apart and connected by an elastic body, and a liquid chamber that can be expanded and contracted by the relative rotation of the driving part and the driven part is provided between them. A liquid-filled vibration isolating device characterized in that a liquid chamber that expands and a liquid chamber that contracts during relative rotation are provided and communicated through a restriction passage.