JPH0495631A - Vibrationproof device - Google Patents

Abstract

PURPOSE:To absorb vibration over a wide range of frequency by providing an elastic body, a pressure liquid chamber, and a first sub-liquid chamber between an inner cylinder and an outer cylinder, by providing a second sub-liquid chamber on the reverse side through the inner cylinder, and by communicating the pressure liquid chamber and the first and second sub-liquid chambers with each other. CONSTITUTION:An elastic body 22 and a thin film elastic body 24 are provided between an inner cylinder 12 and an outer cylinder 14, while a bulkhead 28 and a thin film elastic body 32 are further provided so as to form a main liquid chamber (pressure liquid chamber) 34, and sub-liquid chambers 36, 38. The main liquid chamber 34 and the sub-liquid chamber 38 are communicated with each other through a communicating route 42, while the main liquid chamber 34 and the sub-liquid chamber 36 are communicated with each other through another communication route of the resistance larger than that of the communication route 42. The vibration is transmitted from the inner cylinder 12 to the main liquid chamber 34, and is absorbed by the elastic body 22, and in the case of low frequency, the pressure variation is transmitted from the main liquid chamber 34 to the sub-liquid chamber 36, and the vibration is absorbed by the communication route due to liquid column resonance. In the case of high frequency, the thin film elastic body 24 is deformed, and a resonance of liquid is generated in the communication route 42, and the elevation of a dynamic spring constant is suppressed thereby. The vibration is thus absorbed over frequencies in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolator in which an inner cylinder and an outer cylinder are arranged with parallel axes interposed between them via an elastic body.

[Background technology]

There is a liquid-filled bush type vibration damping device which is used for automobiles, especially as an engine mount, and has an inner cylinder and an outer cylinder arranged with parallel axes to each other.

In some of these vibration isolators, a pair of liquid chambers are provided in an elastic body between an inner and outer cylinder, and these chambers are communicated with each other through a restricted passage. In this vibration isolator, when engine vibration is applied to one liquid chamber, the vibration is absorbed by passage resistance when the liquid in this liquid chamber moves toward the other liquid chamber. .

However, although such a conventional vibration isolator has good damping characteristics for relatively low frequency and high amplitude vibrations, its vibration absorption effect for relatively high frequency and low amplitude vibrations is insufficient.

[Problem to be solved by the invention]

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

[Means to solve the problem]

The invention of claim (1) of the present application provides an inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and these inner cylinders. and an elastic body interposed between the inner cylinder and the outer cylinder; an expandable and contractible pressure receiving liquid chamber provided on one side of the inner cylinder and receiving vibrations from a vibration source; and an elastic body interposed between the inner cylinder and the pressure receiving liquid chamber. an expandable and retractable first sub-liquid chamber provided on the same side as the pressure-receiving liquid chamber; a first restriction passage that communicates between the liquid chamber and the second sub-liquid chamber; and a second restriction passage that has a higher passage resistance than the first restriction passage and that communicates the pressure-receiving liquid chamber and the first sub-liquid chamber. It is characterized by having

The invention of claim (2) of the present application provides an inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and these inner cylinders. an elastic body interposed between the inner cylinder and the outer cylinder; an expandable and contractible pressure receiving liquid chamber provided on one side of the inner cylinder and receiving vibration from a vibration source; and an elastic body interposed between the inner cylinder and the pressure receiving liquid chamber. an expandable and retractable first sub-liquid chamber provided on the same side as the pressure-receiving liquid chamber; a first restriction passage that communicates between the liquid chamber and the first sub-liquid chamber; and a second restriction passage that has greater passage resistance than the first restriction passage and that communicates the pressure-receiving liquid chamber and the second sub-liquid chamber. It is characterized by having the following.

The invention of claim (3) of the present application provides an inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and these inner cylinders. and an elastic body interposed between the inner cylinder and the outer cylinder; an expandable and contractible pressure receiving liquid chamber provided on one side of the inner cylinder and receiving vibrations from a vibration source; and an elastic body interposed between the inner cylinder and the pressure receiving liquid chamber. an expandable and retractable first sub-liquid chamber provided on the same side as the pressure-receiving liquid chamber; a first restriction passage that communicates between the liquid chamber and the second sub-liquid chamber; and a second restriction passage that has greater passage resistance than the first restriction passage and that communicates the first sub-liquid chamber and the second sub-liquid chamber. It is characterized by having the following.

The invention of claim (4) of the present application provides an inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and these inner cylinders. and an elastic body interposed between the inner cylinder and the outer cylinder; an expandable and contractible pressure receiving liquid chamber provided on one side of the inner cylinder and receiving vibrations from a vibration source; and an elastic body interposed between the inner cylinder and the pressure receiving liquid chamber. an expandable and retractable first sub-liquid chamber provided on the same side as the pressure-receiving liquid chamber; a first restriction passage that communicates between the liquid chamber and the first sub-liquid chamber; and a second restriction passage that has greater passage resistance than the first restriction passage and that communicates the first sub-liquid chamber and the second sub-liquid chamber. It is characterized by having the following.

Therefore, in these inventions, if the vibration applied to the pressure receiving liquid chamber is a low frequency such as engine shake vibration (for example, less than 157), the passage resistance or liquid when passing through the second restriction passage is This vibration is absorbed by column resonance. If the vibration is a high frequency such as idle vibration (-20 to 40 as an example) (2), the second restriction passage becomes clogged, so the vibration is absorbed by resonance in the first restriction passage and the moving spring Suppress the increase in constants.

As described above, in these inventions, the pressure-receiving liquid chamber and the first sub-liquid chamber are arranged on one side of the inner cylinder, and the second sub-liquid chamber is arranged on the other side, so that the narrow space between the inner and outer cylinders is avoided. Desired vibration absorption characteristics can be obtained by appropriately arranging these liquid chambers.

The restriction passage applied to the present invention can be made into a long restriction passage by detouring the intermediate portion up to one turn to the same side as the sub-liquid chamber that does not directly communicate with the restriction passage, Can accommodate various required vibration absorption characteristics.

In addition, in the present invention, the sub-liquid chamber, which is communicated with the pressure-receiving liquid chamber to absorb low-frequency vibrations, has low resistance to expansion and contraction, and the sub-liquid chamber, which is communicated with the pressure-receiving liquid chamber to absorb high-frequency vibrations, has little resistance to expansion and contraction. The resistance is increased. For this purpose, the thicknesses of the elastic bodies defining parts of these sub-liquid chambers may be made different.

Note that the passage resistance of the restricted passage can be changed by changing the cross-sectional area and length.

[Embodiments of the invention]

1 to 3 show a vibration isolating device 10 according to a first embodiment of the present invention.
It is shown.

In this vibration isolator 10, an inner tube 12 and an outer tube 14 are arranged coaxially. An intermediate cylinder 16 shown in FIG. 4 is inserted inside the outer cylinder 14, and the intermediate cylinder 16 is fixed to the inner periphery of the outer cylinder 14 by caulking the diameter of the outer cylinder 14.

As shown in FIG. 4, the intermediate cylinder 16 has a reduced diameter portion 16A formed in the axially intermediate portion, and this reduced diameter portion 16A has cutout portions 16B and 16C formed on the opposite side across the axis. A narrow diameter reduced part 16D is formed on one side of the notch 16B between it and the large diameter part, and narrow diameter reduced parts 16E are formed on both sides of the cutout 16C.

An elastic body 22 is provided between the inner circumference of the intermediate cylinder 1G and the outer circumference of the inner cylinder 12. This elastic body 22 can be made of rubber, for example, and can be vulcanized and bonded between the outer periphery of the inner cylinder 12 and the inner periphery of the intermediate cylinder 16.

A part of this elastic body 22 has a notch 1 as shown in FIG.
It communicates with an extension part 22B disposed on a part of the outer periphery of the reduced diameter part 16A via a connecting part 22A that enters a part of the inner periphery of the diameter reducing part 16A. The end of the extension portion 22B opposite to the connection portion 22A is integrally connected to a thin film elastic body 24 that is hooked to the inner peripheral portion of the notch portion 16B. This thin film elastic body 24
A cavity 26 is formed between the inner cylinder 12 and the elastic body 22, and the thin film elastic body 24 is elastically deformable in the direction of expansion and contraction of the cavity 26.

A partition plate 28 shown in detail in FIG. 4 is connected to the notch 16C of the intermediate cylinder 16.

As shown in FIG. 2, this partition plate 28 has a substantially U-shape in which both leg portions 28A are bent at right angles.
As shown in FIG. 4, 8A has a substantially semicircular side surface shape when viewed from the axial direction of the vibration isolator 10. Further, from the outer circumferential surface of both leg portions 28A, a flange portion 28B is formed at a right angle.
This flange portion 28B is arranged between the narrow diameter reduced portion 16E and the outer cylinder 14 as shown in FIG. 2, thereby holding the partition plate 28.
has entered into a notch 22C formed in the elastic body 22. Note that a part of the elastic body 22 is inserted between the flange portion 28B and the narrow diameter reduced portion 16E to form a liquid-tight state.

Further, a thin film elastic body 3 is provided between the partition plate 28 and the outer cylinder 14.
2 is placed. The thin film elastic body 32 is vulcanized and bonded to the inner circumferential surface of the outer cylinder 14 near its outer circumference, and the second
As shown in the figure, it is held between the flange portion 28B and the outer cylinder 14. This thin film elastic body 32 forms an air chamber 33 between it and the outer cylinder 14 . In order to communicate the air chamber 33 with outside air, an opening may be provided in a part of the outer cylinder 14.

Here, the elastic body 32 is made thinner than the thin film elastic body 24, and its resistance to expansion and contraction of the sub-liquid chamber 38 is greater than that of the sub-liquid chamber 36.

Here, a main liquid chamber 34 which is a pressure receiving liquid chamber is formed between the inner periphery of the notch 22C and the partition plate 28, and a sub liquid chamber 36 is formed between the partition plate 28 and the thin film elastic body 32. ing. Further, a sub-liquid chamber 38 is formed between the thin film elastic body 24 and the outer cylinder 14. Therefore, the main liquid chamber 34 and the sub-liquid chamber 36 are connected to the inner cylinder 1.
2, and the sub-liquid chamber 38 is disposed on the opposite side.

The main liquid chamber 34 and the sub liquid chamber 38 are connected to the outer cylinder 14 and the reduced diameter part 16.
The main liquid chamber 34 and the sub-liquid chamber 36 communicate with each other via the communication path 42 (FIG. 1) between the reduced diameter portion 16A and the outer cylinder 14 (see FIG. 1). .4)).

An end of this communication passage 44 is communicated with the sub-liquid chamber 36 via a recess 28C of the partition plate 28 shown in FIG. Therefore, the intermediate portion of this communication path 44 is connected to the sub-liquid chamber 3 through the inner cylinder 12.
Since the curved detour extends to the same side as 8, sufficient length can be ensured to meet various required vibration absorption characteristics.

In order to partition the communication path 42 and the communication path 44, a partition wall 46 is formed between the narrow diameter reduced portion 16D and the outer cylinder 14, as shown in FIG. This partition wall 46 is formed by extending a portion of the thin film elastic body 24. This partition wall 46 has a narrow width reduced diameter portion 16. It has a wall shape that protrudes from the end of the notch 16B side of D toward the outer cylinder 14, and its tip section partitions the communication path 42 and the communication path 44 by being pressed against the inner circumferential surface of the outer cylinder 14. ing.

Here, in this embodiment, the passage resistance of the communication passage 42 is made smaller than that of the communication passage 44, so that the liquid in the main liquid chamber 34 can pass through the communication passage 42 to the auxiliary liquid chamber 38 relatively easily. It is designed to be relatively difficult to pass through the passage 44 to the auxiliary liquid chamber 36. Further, the thin film elastic body 24 is a thin film elastic body 32.
It is formed relatively hard compared to the main liquid chamber 34, and low frequency vibrations
When the liquid is applied to the liquid, the thin film elastic body 32 is easily deformed without deforming the secondary liquid chamber 38, so that the liquid can easily pass through the communication passage 44 to the secondary liquid chamber 36.

Next, the manufacturing procedure of the vibration isolator 10 according to this embodiment will be explained.

An elastic body 22 is formed between the inner cylinder 12 and the intermediate cylinder 16.

This elastic body 22 is formed by integrally extending an extension portion 22B and a thin film elastic body 24. On the other hand, a thin film elastic body 32 is vulcanized and bonded to the outer cylinder 14 .

Here, the intermediate cylinder 16 is inserted into the inner periphery of the outer cylinder 14 with parallel axes to form the arrangement shown in FIG. 1.2. At the time of this insertion, the partition plate 28 is placed in advance in the notch 22C to partition the main liquid chamber 34 and the auxiliary liquid chamber 36.

The vibration isolator 10 shown in FIG. 112 is completed by reducing the outer diameter of the outer cylinder 14 and caulking and fixing the outer cylinder I4 to the outer periphery of the intermediate cylinder I6.

The assembly is completed by attaching the inner tube 12 and the outer tube 14 to the vibration generating section and the vibration receiving section, respectively. - For example, the outer cylinder 14 is attached to the body of a car, and the inner cylinder 12 supports the car engine.

The vibrations of the automobile engine are transmitted to the main liquid chamber 34 via the inner cylinder 12. This vibration is absorbed by the internal friction of the elastic body 22, but when the vibration frequency is low, pressure changes in the main liquid chamber 34 are transmitted to the auxiliary liquid chamber 36 via the communication path 44. That is, when the vibration frequency is low, the pressure change generated in the main liquid chamber 34 is also transmitted to the auxiliary liquid chamber 38 through the communication path 42, but this auxiliary liquid chamber 38 is
4 is relatively hard, the volume of the sub-liquid chamber 38 is difficult to change, and the sub-liquid chamber 36 is easily deformed, so that the volume of the sub-liquid chamber 36 is changed through the communication path 44. Therefore, this low frequency vibration is absorbed by passage resistance or liquid column resonance when passing through the communication path 44.

Furthermore, when the vibration frequency becomes relatively high, the communication passage 44 becomes clogged. In this case, this high-frequency, low-amplitude vibration deforms the thin film elastic body 24, and the communication path 4
2, liquid resonance occurs and an increase in the dynamic spring constant is suppressed.

In this way, in this embodiment, the main liquid chamber 34 and the sub-liquid chamber 36 are arranged on one side of the inner cylinder 12, and the sub-liquid chamber 38 is arranged on the other side, so that these liquid chambers, the cavity 2G, and the air The chamber 33 can have a relatively large volume, absorbing vibrations caused by large strokes, and improving durability.

Further, since the thin film elastic body 24 can be molded at the same time as the elastic body 22, processing is easy.

Note that the above embodiment has a structure corresponding to claim (1) of the present application, but in the above embodiment, the communication path 42 is smaller than the communication path 44.
The passage resistance of the communication path 44 may be increased.
without making a detour around the intermediate inner cylinder 12.
In contrast to 2, if the main liquid chamber 34 and the auxiliary liquid chamber 36 are communicated with each other by a short communication path on the same side as the main liquid chamber 34 and the auxiliary liquid chamber 36, an embodiment corresponding to claim (2) of the present application can be obtained. Become.

Next, a second embodiment of the present invention is shown in FIGS. 5-8. In this embodiment, the notch 16B of the intermediate cylinder 16 in the previous embodiment is formed with a large area, the partition wall 48 is arranged between the reduced diameter part 16A and the outer cylinder 14, and the thin film elastic body 24 is
A sub-liquid chamber 38 is provided between the two. This partition wall 48 is the eighth
As shown in the figure, the cross-sectional shape perpendicular to the longitudinal direction is U-shaped, and a partition wall 52 is erected from the center thereof. Also, this partition wall 4
8 is bent coaxially with the outer cylinder 14, as shown in FIG. 5.7.

As an example, the partition wall 48 may be made of nylon, with one side of the partition wall 52 forming an extension 52A of the communication passage 42, and the other side of the partition wall 52 forming an intermediate portion 52A of the communication passage 44.
A through hole 54 is formed in a part of the bottom surface of the partition wall 48 corresponding to the extension part 52A forming the section B, and communicates the sub-liquid chamber 38 with the communication path 42. The communication path 44 has a higher passage resistance than the communication path 42, and the thin film elastic body 24 has a higher passage resistance than the communication path 42.
This is similar to the previous embodiment in that the thickness is within the thickness of 2.

The rest of the structure is the same as that of the previous embodiment, and the same effects can be obtained.

Next, FIGS. 9 to 12 show a vibration isolating device according to a third embodiment of the present invention.

In this embodiment, a protection plate 56 is provided in addition to the first embodiment. The protection plate 56 is made of a thin plate material bent into a substantially U-shape, and further has receiving portions 56A extending in opposite directions from the ends of both legs. This protective plate 56
is disposed within the cavity 26, the receiving portion 56A is brought into contact with the inner circumferential surface of the intermediate cylinder 16, and the caulking portions 58 formed at both axial ends of the outer cylinder 14 secure the axially opposite ends of the intermediate cylinder 16. It is maintained with the department.

Therefore, in this embodiment, the protection plate 56 prevents large elastic deformation of the thin film elastic body 24 and also prevents the inner cylinder 12 and the outer cylinder 12 from being deformed.
When there is a large relative displacement in the direction perpendicular to the axis, the thin film elastic body 24 is clamped so as not to receive a large compressive force.

The other configurations are similar to those of the first embodiment, and similar effects can be obtained.

Next, FIGS. 13 and 14 show a fourth embodiment of the invention. In this embodiment, a reinforcing plate 62 is provided in the middle part of the elastic body 22.
is buried. As shown in FIG. 15, this reinforcing plate 62 is a gently bent metal plate, and has a punched through hole 64 formed in the middle part. This reinforcing plate 62 is embedded in the elastic body 22 so as to surround the notch 22C.

Therefore, this reinforcing plate 62 improves the rigidity of the elastic body 22 in the vertical direction in FIG.
When the main liquid chamber 34 receives pressure, the liquid in the main liquid chamber 34 can be sent to the communication path 42 or the communication path 44 with strong force.

The rest of the structure is the same as that of the first embodiment, and the same effects can be obtained.

Next, FIGS. 16 and 17 show a fifth embodiment of the invention.

In this embodiment, a partition plate 66 is arranged within the main liquid chamber 34. This partition plate 66 is fixed to a support base 68 that protrudes from a part of the inner cylinder 12, and forms a flow portion 72 between the periphery of the partition plate 66 and the inner circumferential wall of the main liquid chamber 34.

Therefore, in this embodiment, when high-frequency vibrations that cause both communication passages 42 and 44 to become clogged are applied to the main liquid chamber 34, the inside of the main liquid chamber 34 is It is designed to generate resonance in the liquid and suppress an increase in the dynamic spring constant during this high-frequency vibration.

The other structures are similar to those of the first embodiment, and similar effects can be obtained.

Next, FIGS. 18 to 21 show a sixth embodiment of the present invention.

This embodiment has a configuration corresponding to claim (3) of the present application, and a main liquid chamber 34, a sub-liquid chamber 38, and a sub-liquid chamber 36 are connected in series. That is, the main liquid chamber 34 is connected to the auxiliary liquid chamber 38 via a communication passage 42 that goes around the inner cylinder 12 for about 1/2 of the way, and the auxiliary liquid chamber 38 connects to the communication passage 44 that goes around the inner cylinder 12 for about 1/2 of the way. They are each communicated with the sub-liquid chamber 36 via the liquid chambers 36 and 36, respectively. The communicating path 42 has a communication width determined by a rubber partition wall 82 disposed between the reduced diameter portion 16A and the outer cylinder 14, and the communication path 44 has a communication width determined by the partition wall 84. The passage resistance is also large. Further, the thin film elastic body 24 defining a part of the sub-liquid chamber 38 is made thicker than the thin film elastic body 32 defining a part of the sub-liquid chamber 36, so that the sub-liquid chamber 38 is
The expansion/contraction resistance is greater than that of the

Therefore, in this embodiment, relatively low-frequency vibrations such as shake vibrations occur in the communication passage 44, and high-frequency vibrations such as idle vibrations cause the sub-liquid chamber 38 to deform and move the spring even if the communication passage 44 becomes clogged. suppress the increase in

Next, FIGS. 22 to 25 show a seventh embodiment of the present invention. This embodiment corresponds to claim (4) of the present application.

That is, in this embodiment, the main liquid chamber 34 communicates with the sub-liquid chamber 36, and the sub-liquid chamber 36 communicates with the sub-liquid chamber 3 through the communication path 44.
It is connected to 8. As shown in FIG. 24, the outer periphery of the reduced diameter portion 16A corresponding to the space between the main liquid chamber 34 and the auxiliary liquid chamber 38 is filled with a partition wall 86 to block direct connection between these liquid chambers.

Furthermore, a burring portion 88 is formed on the partition plate 28 that partitions the main liquid chamber 34 and the sub-liquid chamber 36, and the inside thereof is connected to the communication passage 4.
2. The main liquid chamber 34 is communicated with the auxiliary liquid chamber 36 through this communication passage 42 having a short axial length. As shown in FIG.
The groove width is determined by , and the passage resistance is larger than that of the communication path 42 . Furthermore, the thin film elastic body 32 that defines a part of the partition plate 36 is made thicker than the thin film elastic body 24 that defines a part of the sub-liquid chamber 38, thereby increasing the expansion/contraction resistance of the sub-liquid chamber 36. There is.

Therefore, in this embodiment, relatively low frequency vibrations are transmitted to the main liquid chamber 3.
4 through the communication path 42 and the sub-liquid chamber 36, and is absorbed by the communication path 44. When high-frequency vibrations cause the communication path 44 to become clogged, the movement spring is increased by expanding and contracting the sub-liquid chamber 36. suppressed.

Next, FIGS. 26 to 32 show an eighth embodiment of the present invention,
Similar to the embodiment described above, this embodiment corresponds to claim (4) of the present application.

The main liquid chamber 34 of this embodiment is communicated with a sub-liquid chamber 36 via a communication path 42 with relatively large passage resistance, and the sub-liquid chamber 36 is communicated with a sub-liquid chamber 36 via a communication path 44 with relatively small passage resistance. It communicates with the chamber 38.

That is, as shown in FIG. 27, a flange portion 28B of the partition plate 28 is disposed between the narrow diameter reduced portion 16E and the outer cylinder 14. As shown in FIG. 28, a recess 92 formed in a part of the partition plate 28 that partitions the main liquid chamber 34 and the sub-liquid chamber 36 communicates the main liquid chamber 34 and the communication path 42.

This communication path 42 is connected to the reduced diameter portion 16A as shown in FIG.
The groove width is determined by the partition wall 94 disposed between the outer cylinder 14 and the groove 98 as a communication path of the nylon plate 96 that closes the notch 16B, and the reduced diameter portion 16A as shown in FIG. It communicates with the sub-liquid chamber 36 via a communication path 42A defined by partition walls 102 and 104 disposed between the outer cylinder 14 and the outer cylinder 14 . The communication path 42A and the sub-liquid chamber 36 communicate with each other through a part of a recess 106 located on the opposite side of the recess 92 of the partition plate 28, as shown in FIG.

As shown in FIG.
A communication path 44 is formed between the two. One end of this communication path 44 communicates with the sub-liquid chamber 36 through another part of the recess 106 . The other end of the communication path 44 is a nylon plate 96
The groove 112 is connected to one end of the groove 112 as a communicating path formed parallel to the groove 98, and the other end of the groove 112 is connected to the partition wall 94.
is blocked by. Further, a through hole 114 is formed at the bottom of this groove 112 and communicates with the sub-liquid chamber 38 . The sub-liquid chamber 38 is located between the bottom surface of the nylon plate 96 and the notch 16B.
and a thin film elastic body 24 whose periphery is vulcanized and bonded to the periphery. Therefore, the sub-liquid chamber 36 is communicated with the sub-liquid chamber 38 via the communication path 44, the groove 112, and the through hole 114.

Here, the passage resistance of the communication passage 44, the groove 112, and the through hole 114 is greater than the passage resistance of the communication passage 42, the groove 98, and the communication passage 42A that detour around the inner cylinder 12, and the sub-liquid chamber 3
The thickness of the thin film elastic body 32 defining a part of the auxiliary liquid chamber 36 is made larger than the thickness of the thin film elastic body 24, so that the sub liquid chamber 36 becomes the sub liquid chamber 3.
It is more difficult to deform than 8.

Therefore, in this embodiment, when low frequency vibrations are transmitted from the main liquid chamber 34 to the auxiliary liquid chamber 38 via the auxiliary liquid chamber 36, the passage resistance of the communication passage 44, the groove 112, and the through hole 114 or the liquid column resonance. At the time of high-frequency vibrations that are absorbed and cause these communication passages to become clogged, the expansion and contraction of the sub-liquid chamber 38 suppresses an increase in the dynamic spring.

〔Effect of the invention〕

Since the present invention has the above-described structure, it can absorb vibrations over a wide range of frequencies, and has the excellent effect of increasing the volume of the liquid chamber and air chamber.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along the line I-I in Fig. 2, showing a vibration isolator to which the first embodiment of the present invention is applied, Fig. 2 is a sectional view taken along the line ■-■, FIG. 4 is a perspective view showing the intermediate cylinder and the partition plate, and FIG. 5 is a cross-sectional view taken along the line ■-■ in FIG. Sectional view, No. 6
The figure is a sectional view taken along the line ■-■ in Figure 5, and Figure 7 is a cross-sectional view taken along the line ■-■ in Figure 6.
8 is a perspective view showing a partition wall, FIG. 9 is a sectional view taken along line IX-IX in FIG. 10 showing a third embodiment of the present invention,
Figure 10 is a sectional view taken along the line X-X in Figure 9, and Figure 11 is a cross-sectional view of Figure 10.
12 is a perspective view showing the protection plate, FIG. 13 is a sectional view taken along the line xm-xm in FIG. 14 showing the fourth embodiment of the present invention, and FIG. XIV-X in Figure 13
15 is a perspective view showing the reinforcing plate, 1st
Figure 6 shows the fifth embodiment of the present invention.
Figure 17 is a cross-sectional view taken along the line X--X in Figure 16.
FIG. 18 shows the sixth embodiment of the present invention.
19 is a sectional view taken along line X-X in FIG. 18. FIGS. 20 and 21 are sectional views taken along line XX-XX in FIG.
XX I-XX r-line sectional view, FIG. 22 is the seventh embodiment of the present invention.
A sectional view taken along the line xxn-xxn of FIG. 23 showing the embodiment, the second
Figure 3 is a sectional view taken along the line XXIII-XXIII in Figure 22 (1)), and Figures 24 and 25 are sectional views taken along the line XXIV-XXI in Figure 22, respectively.
26 is a sectional view taken along the line XXVT-xxvr in FIG. 27 showing the eighth embodiment of the present invention; FIG. 27 is a sectional view taken along the XX■-XX■ line in FIG. 26. , second
Figure 8 is a perspective view showing the partition plate used in this example;
The figure is a sectional view taken along the line XXIX-XXIX in FIG. 27, and FIG. 30 is a perspective view showing the nylon plate used in this example.
・Figures 31 and 32 are XXXI-XXXI of Figure 26, respectively.
It is a sectional view taken along the line xxxn-xxxn. DESCRIPTION OF SYMBOLS 10... Vibration isolator, 12... Inner cylinder, 14... Outer cylinder, 16... Intermediate cylinder, 22... Elastic body, 34... Main liquid chamber, 36.38... Sub-liquid chamber, 42.44...Communication path. Fig. 1 Fig. 2 14- A 22 Elastic body 34 ・Gallery chamber Fig. 8A Fig. V52B 52A I52 Seal-M Fig. ■ 14 ■ 2X--1 Fig. 10 141-- -x44ゎFigure-'''-xv+ Figure 20 +6A Figure XX old-j ``Bow◇■ I-唖■ XX■,,,-'' +6A To +6 Figure 27 XX

Claims (4)

[Claims] (1) An inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and an inner cylinder interposed between these inner cylinder and outer cylinder. an expandable and contractible pressure-receiving liquid chamber that is provided on one side of the inner cylinder and receives vibration from a vibration source; and an expandable and contractible pressure-receiving liquid chamber that is provided on the same side of the inner cylinder as the pressure-receiving liquid chamber. a first sub-liquid chamber; a second sub-liquid chamber that is expandable and retractable and provided on the opposite side of the pressure-receiving liquid chamber and the first sub-liquid chamber via the inner cylinder; and the pressure-receiving liquid chamber and the second sub-liquid chamber. a first restriction passage that communicates with the first auxiliary liquid chamber; and a second restriction passage that has greater passage resistance than the first restriction passage and communicates the pressure-receiving liquid chamber with the first sub-liquid chamber. Device. (2) An inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and an inner cylinder interposed between these inner cylinder and outer cylinder. an expandable and contractible pressure-receiving liquid chamber that is provided on one side of the inner cylinder and receives vibration from a vibration source; and an expandable and contractible pressure-receiving liquid chamber that is provided on the same side of the inner cylinder as the pressure-receiving liquid chamber. a first sub-liquid chamber; a second sub-liquid chamber that is expandable and contractible and provided on the opposite side of the pressure-receiving liquid chamber and the first sub-liquid chamber via the inner cylinder; and the pressure-receiving liquid chamber and the first sub-liquid chamber. a first restriction passage that communicates with the first restriction passage; and a second restriction passage that has greater passage resistance than the first restriction passage and communicates the pressure receiving liquid chamber with the second sub-liquid chamber. Anti-vibration device. (3) An inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and an inner cylinder interposed between these inner cylinder and outer cylinder. an expandable and contractible pressure-receiving liquid chamber that is provided on one side of the inner cylinder and receives vibration from a vibration source; and an expandable and contractible pressure-receiving liquid chamber that is provided on the same side of the inner cylinder as the pressure-receiving liquid chamber. a first sub-liquid chamber; a second sub-liquid chamber that is expandable and retractable and provided on the opposite side of the pressure-receiving liquid chamber and the first sub-liquid chamber via the inner cylinder; and the pressure-receiving liquid chamber and the second sub-liquid chamber. a first restriction passage that communicates with the first restriction passage; and a second restriction passage that has greater passage resistance than the first restriction passage and communicates the first sub-liquid chamber with the second sub-liquid chamber. Anti-vibration device. (4) An inner cylinder connected and supported to one of the vibration generating part and the vibration receiving part, an outer cylinder connected to the other of the vibration generating part and the vibration receiving part, and an inner cylinder interposed between these inner cylinder and outer cylinder. an expandable and contractible pressure-receiving liquid chamber that is provided on one side of the inner cylinder and receives vibration from a vibration source; and an expandable and contractible pressure-receiving liquid chamber that is provided on the same side of the inner cylinder as the pressure-receiving liquid chamber. a first sub-liquid chamber; a second sub-liquid chamber that is expandable and contractible and provided on the opposite side of the pressure-receiving liquid chamber and the first sub-liquid chamber via the inner cylinder; and the pressure-receiving liquid chamber and the first sub-liquid chamber. a first restriction passage that communicates with the first restriction passage; and a second restriction passage that has greater passage resistance than the first restriction passage and communicates the first sub-liquid chamber with the second sub-liquid chamber. Anti-vibration device.