JP2021063549A - Vehicular vibration isolating device - Google Patents

Abstract

To change vibration attenuating characteristics of a vehicular vibration isolating device without causing an increase in the number of components or a problem of durability.SOLUTION: A vehicular vibration isolating device is equipped with a first attaching member to be attached to a first member, a second attaching member to be attached to a second member, a first liquid chamber 10 and a second liquid chamber 11 that change capacities according to the relative displacement of the first attaching member and the second attaching member, and an orifice passage 12 circulating liquid between the first liquid chamber 10 and the second liquid chamber 11 according to the change of the capacities of the first liquid chamber 10 and the second liquid chamber 11. The liquid includes a non-Newtonian fluid whose viscosity lowers according to a rise of shear velocity. The orifice passage 12 includes a main passage part 31 connecting the first liquid chamber 10 and the second liquid chamber 11, and a sub passage part 32 extending parallel to the main passage part 31. The sub passage part 32 is provided with an inflow rate variable structure 34 increasing a flow rate of the liquid to the sub passage part 32 according to the degradation of the viscosity of the non-Newtonian fluid.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle vibration isolator.

A vehicle vibration isolator that damps vibration by circulating a liquid between a plurality of liquid chambers via an orifice passage is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-324823

When changing the vibration damping characteristics of a vehicle vibration isolator, the orifice passage is mechanically changed or the orifice passage is opened and closed by a valve. However, for the former, a mechanism for mechanically changing the orifice passage is required, which may increase the number of parts. Further, with respect to the latter, since there are moving parts such as valves, there is a possibility that a problem of durability may occur.

In view of the above background, it is an object of the present invention to change the vibration damping characteristics of a vehicle vibration isolator without increasing the number of parts and causing problems of durability.

In order to solve the above problems, one aspect of the present invention is a vehicle vibration isolator (1), which is a first mounting member (5) to be mounted on the first member (2) and a second member (3). The second liquid chamber (6) to be attached to the first liquid chamber (10) and the second liquid chamber (11) whose volume is changed according to the relative displacement between the first mounting member and the second mounting member. The liquid is provided with an orifice passage (12) for flowing a liquid (M) between the first liquid chamber and the second liquid chamber according to a change in the volume of the first liquid chamber and the second liquid chamber. However, the main passage portion (31), which contains a non-Newton fluid whose viscosity decreases as the shear rate increases, and the orifice passage communicates with each other between the first liquid chamber and the second liquid chamber, and the main passage. A variable inflow amount is included in the sub-passage portion, including a sub-passage portion (32) parallel to the passage portion, and the inflow amount of the liquid into the sub-passage portion is increased in response to a decrease in the viscosity of the non-Newton fluid. The structure (34) is provided.

According to this aspect, it is possible to change the vibration damping characteristic of the vehicle vibration isolator without using a mechanism for mechanically changing the orifice passage, and it is possible to suppress an increase in the number of parts of the vehicle vibration isolator. it can. Further, the vibration damping characteristic of the vehicle vibration isolator can be changed without using a moving part such as a valve, and the durability of the vehicle vibration isolator can be improved.

In the above aspect, the variable inflow amount structure may be provided at a communication portion with the main passage portion in the sub-passage portion.

According to this aspect, when the viscosity of the non-Newtonian fluid is high, the liquid mainly flows only in the main passage portion, and when the viscosity of the non-Newtonian fluid decreases, the liquid flows in both the main passage portion and the sub-passage portion. become. Therefore, by adjusting the shape and size of the main passage portion and the sub-passage portion, the vibration damping characteristics of the vehicle vibration isolator can be freely changed.

In the above aspect, the variable inflow structure includes a partition portion (34) that partitions the sub-passage portion with respect to the main passage portion, and the partition portion is provided with a plurality of small holes (35). You may be.

According to this aspect, the amount of liquid flowing from the main passage portion to the sub-passage portion can be gradually increased. Therefore, the vibration damping characteristic of the vehicle vibration isolator can be continuously changed.

In the above aspect, the central axis of the plurality of small holes may be perpendicular to the axis of the main passage portion.

According to this aspect, it is possible to prevent a large amount of liquid from flowing from the main passage portion to the sub-passage portion while the non-Newtonian fluid has a high viscosity.

In the above aspect, the central axis of the plurality of small holes may be parallel to the axis of the main passage portion.

According to this aspect, the liquid can be smoothly flowed from the main passage portion to the sub-passage portion in a state where the viscosity of the non-Newtonian fluid is reduced.

In the above aspect, the diameter of the plurality of small holes may be 50 μm or more and 3 mm or less.

According to this aspect, an appropriate amount of liquid can be flowed from the main passage portion to the sub-passage portion.

In the above aspect, the vehicle vibration isolator includes the elastically deformable first wall body (7) that partially defines the first liquid chamber and supports the first mounting member, and the second liquid. The first wall body (8), which partially defines the chamber and is elastically deformable to be attached to the second mounting member, and the first liquid chamber to partition the second liquid chamber from the first liquid chamber. It may have a partition wall (9) which is coupled to the wall body and is provided with the orifice passage.

According to this aspect, the vibration damping action of the vehicle vibration isolator can be enhanced.

In the above embodiment, the non-Newtonian fluid may be a thixotropic fluid.

According to this aspect, the viscosity of the non-Newtonian fluid can be gradually reduced as the shear rate increases. Therefore, it is possible to suppress a sudden change in the vibration damping characteristics of the vehicle vibration isolator.

According to the above configuration, it is possible to change the vibration damping characteristic of the vehicle vibration isolator without causing an increase in the number of parts and a problem of durability.

Sectional drawing of the engine mount which concerns on one Embodiment of this invention Graph showing viscosity characteristics of Newtonian fluid and thixotropic fluid Schematic sectional view showing an orifice passage according to an embodiment of the present invention. Front view showing a partition portion according to an embodiment of the present invention. Schematic cross-sectional view showing an orifice passage according to another different embodiment of the present invention. Schematic cross-sectional view showing an orifice passage according to another different embodiment of the present invention.

Hereinafter, a liquid-filled engine mount 1 (an example of a vehicle vibration isolator) according to an embodiment of the present invention will be described with reference to the drawings. Arrows U and Lo appropriately attached to each figure indicate the upper side and the lower side of the engine mount 1, respectively.

<Configuration of engine mount 1>
With reference to FIG. 1, the engine mount 1 is arranged between an engine 2 (an example of a first member) and a vehicle body 3 (an example of a second member), which are internal combustion engines, in a vehicle such as an automobile. The engine mount 1 is a component for supporting the engine 2 while suppressing the vibration of the engine 2.

The engine mount 1 is a first wall body arranged between a first mounting member 5 mounted on the engine 2, a second mounting member 6 mounted on the vehicle body 3, and a first mounting member 5 and a second mounting member 6. 7, a second wall body 8 arranged below the first wall body 7, a partition wall 9 arranged between the first wall body 7 and the second wall body 8, and a first wall body 9 provided above the partition wall 9. It includes a 1-liquid chamber 10, a second liquid chamber 11 provided below the partition wall 9, and an orifice passage 12 provided on the outer periphery of the partition wall 9. Hereinafter, the components of the engine mount 1 will be described in order.

The first mounting member 5 of the engine mount 1 is located at the upper end of the engine mount 1. The first mounting member 5 includes an engaging portion 14 and a mounting portion 15 projecting upward from the upper surface of the engaging portion 14. The mounting portion 15 is mounted on the engine 2 by bolts 16.

The second mounting member 6 of the engine mount 1 is located below the engine mount 1. The second mounting member 6 includes an outer cylinder portion 18 and an inner cylinder portion 19 arranged on the inner peripheral side of the outer cylinder portion 18. The upper end of the outer cylinder 18 and the upper end of the inner cylinder 19 are attached to each other by bolts 20. The lower portion of the outer cylinder portion 18 is attached to the vehicle body 3 by bolts (not shown).

The first wall body 7 of the engine mount 1 is made of rubber and is provided so as to be elastically deformable. An upper concave portion 22 opened upward is provided on the upper portion of the first wall body 7. The engaging portion 14 of the first mounting member 5 is engaged with the upper recess 22. As a result, the first wall body 7 supports the first mounting member 5 from below. A lower concave portion 23 opened downward is provided in the lower portion of the first wall body 7.

The second wall 8 of the engine mount 1 is a so-called diaphragm. The second wall body 8 is formed of rubber and is provided so as to be elastically deformable. The outer peripheral portion of the second wall body 8 is engaged with the lower inner circumference of the inner cylinder portion 19 of the second mounting member 6. As a result, the second wall body 8 is attached to the second attachment member 6.

The partition wall 9 of the engine mount 1 partitions the second liquid chamber 11 with respect to the first liquid chamber 10. The partition wall 9 includes a cylindrical peripheral wall portion 25 and a bottom wall portion 26 that covers the lower end portion of the peripheral wall portion 25. The peripheral wall portion 25 is engaged with the lower recess 23 of the first wall body 7. As a result, the partition wall 9 is connected to the first wall body 7. A spiral outer peripheral groove 27 is provided on the outer peripheral surface of the peripheral wall portion 25.

The first liquid chamber 10 of the engine mount 1 is a space defined by the lower recess 23 and the partition wall 9 of the first wall body 7. That is, the first liquid chamber 10 is a space partially defined by the first wall body 7. The first liquid chamber 10 contains a mount liquid M (an example of a liquid).

The second liquid chamber 11 of the engine mount 1 is provided below the first liquid chamber 10. The second liquid chamber 11 is a space defined by the second wall body 8 and the partition wall 9. That is, the second liquid chamber 11 is a space partially defined by the second wall body 8. The second liquid chamber 11 contains the mount liquid M.

The orifice passage 12 of the engine mount 1 is a passage defined by an outer peripheral groove 27 provided on the outer peripheral surface of the peripheral wall portion 25 of the partition wall 9 and a lower recess 23 of the first wall body 7. That is, the orifice passage 12 is a passage partially defined by the outer peripheral groove 27. The orifice passage 12 communicates the first liquid chamber 10 and the second liquid chamber 11 with each other. The details of the orifice passage 12 will be described later.

<Action of engine mount 1>
When the engine 2 vibrates, the first wall body 7 and the second wall body 8 are elastically deformed in response to the relative displacement of the first mounting member 5 and the second mounting member 6, and the first liquid chamber 10 and the second The volume of the liquid chamber 11 changes. For example, when the first mounting member 5 descends with respect to the second mounting member 6, the first wall body 7 and the second wall body 8 are elastically deformed downward, the volume of the first liquid chamber 10 is reduced, and the second wall body 8 is second. The volume of the liquid chamber 11 increases. On the other hand, when the second mounting member 6 rises with respect to the first mounting member 5, the first wall body 7 and the second wall body 8 are elastically deformed upward, the volume of the first liquid chamber 10 increases, and the volume of the first liquid chamber 10 increases. 2 The volume of the liquid chamber 11 is reduced.

As the volumes of the first liquid chamber 10 and the second liquid chamber 11 change in this way, the mount liquid M flows between the first liquid chamber 10 and the second liquid chamber 11 via the orifice passage 12. .. For example, when the volume of the first liquid chamber 10 decreases and the volume of the second liquid chamber 11 increases, the mount liquid M flows from the first liquid chamber 10 into the second liquid chamber 11. On the other hand, when the volume of the first liquid chamber 10 increases and the volume of the second liquid chamber 11 decreases, the mount liquid M flows from the second liquid chamber 11 into the first liquid chamber 10. As the mount liquid M flows between the first liquid chamber 10 and the second liquid chamber 11 through the orifice passage 12 in this way, the vibration of the engine 2 is damped.

<Mount liquid M>
The mount liquid M is composed only of non-Newtonian fluid. In another different embodiment, the mount liquid M may be composed of both a non-Newtonian fluid and a Newtonian fluid.

The non-Newtonian fluid constituting the mount liquid M is a thixotropic fluid (hereinafter, abbreviated as “thixotropy”). With reference to FIG. 2, the viscosity of the Newtonian fluid is constant regardless of the shear rate, whereas the viscosity of the thixotropy gradually decreases as the shear rate increases. In another different embodiment, a fluid other than thixotropy (for example, Bingham fluid) may be used as the non-Newtonian fluid constituting the mount liquid M.

The thixofluid constituting the mount liquid M is formed by mixing a thixotropy-imparting agent (hereinafter, abbreviated as “thixotropy”) with the base liquid composed of the Newtonian fluid. In another different embodiment, the thixotropy fluid constituting the mount liquid M may contain additives other than the base liquid and the thixotropy.

The base liquid of thixofluid is formed by dissolving a glycol-based solvent (for example, ethylene glycol or propylene glycol) in water. Ethylene glycol has an effect of lowering the freezing temperature of water and has a low viscosity among solvents having such an effect, and is therefore preferable as a solvent for the base liquid. In another different embodiment, the base liquid may be formed by dissolving a solvent other than the glycol-based solvent in water. Further, in other different embodiments, the base liquid may be formed by dissolving a solvent in a liquid other than an aqueous liquid (for example, an oil-based liquid).

The thixotropy of thixofluid is composed of an inorganic material (eg, bentonite or silica). Montmorillonite contained in bentonite is preferable as a thixotropy because it has an effect of reducing the temperature dependence of the characteristics of thixofluid. In other different embodiments, the thixotropy may be composed of an organic material (eg, a cellulose derivative or a polyether material) or a composite material (eg, organic bentonite or calcium carbonate). It may have been done. If the content of the thixotropic agent in the thixotropy fluid is 10 wt% or less, the thixotropic agent can be uniformly dispersed throughout the thixotropy fluid. However, the content of the thixotropic agent in the thixotropy fluid may be an amount exceeding 10 wt% (for example, 20 wt%).

<Structure of Orifice Passage 12>
With reference to FIG. 3, the orifice passage 12 includes a main passage portion 31 and a sub-passage portion 32 parallel to the main passage portion 31. The two-dot chain line X1 in FIG. 3 indicates the axis of the main passage portion 31, and the two-dot chain line X2 in FIG. 3 indicates the axis of the sub-passage portion 32.

The main passage portion 31 of the orifice passage 12 is curved in an arc shape in the axial direction (longitudinal direction) thereof. However, in FIG. 3, the main passage portion 31 which is actually curved in an arc shape is schematically displayed in a straight tubular shape. The first end portion 31a of the main passage portion 31 communicates with the first liquid chamber 10, and the second end portion 31b of the main passage portion 31 communicates with the second liquid chamber 11. That is, the main passage portion 31 communicates the first liquid chamber 10 and the second liquid chamber 11 with each other.

The sub-passage portion 32 of the orifice passage 12 is provided in parallel with the main passage portion 31. In another different embodiment, the sub-passage portion 32 may be provided perpendicular to the main passage portion 31, or the sub-passage portion 32 may be inclined with respect to the main passage portion 31.

The sub-passage portion 32 of the orifice passage 12 is curved in an arc shape in the axial direction (longitudinal direction) thereof. However, in FIG. 3, the sub-passage portion 32 that is actually curved in an arc shape is schematically displayed in a straight tubular shape. The first end 32a of the sub-passage portion 32 communicates with the intermediate portion of the main passage portion 31 (the portion between the first end portion 31a and the second end portion 31b), and the second end portion of the sub-passage portion 32. 32b communicates with the second liquid chamber 11. That is, the sub-passage portion 32 communicates the main passage portion 31 and the second liquid chamber 11 with each other.

The first end 32a of the sub-passage portion 32 of the orifice passage 12 is provided with a communication hole 33 for communicating the main passage portion 31 and the sub-passage portion 32. A partition portion 34 (an example of an inflow amount variable structure) is provided at the first end portion 32a of the sub-passage portion 32 so as to cover the communication hole 33. The partition portion 34 is a flat plate-shaped member that partitions the sub-passage portion 32 with respect to the main passage portion 31. In another different embodiment, the partition portion 34 may be a mesh-shaped member. The shape of the partition portion 34 is freely determined according to the flow velocity and the viscosity of the mount liquid M when the mount liquid M flows into the sub-passage portion 32.

With reference to FIGS. 3 and 4, a plurality of small holes 35 are provided in the partition portion 34 of the orifice passage 12. The central axis Y of the plurality of small holes 35 is perpendicular to the axis X1 of the main passage portion 31. The plurality of small holes 35 form a perfect circle. In another different embodiment, the plurality of small holes 35 may have a shape other than a perfect circle (for example, a polygonal shape such as a quadrangular shape, an ellipse shape, a slit shape, or the like). The diameter of the plurality of small holes 35 is 50 μm or more and 3 mm or less. As a result, an appropriate amount of the mounting liquid M can flow from the main passage portion 31 to the sub-passage portion 32. In other different embodiments, the diameter of the plurality of small holes 35 may be less than 50 μm or more than 3 mm.

<Action of orifice passage 12>
When the flow velocity of the mount liquid M is low, the shear rate of the mount liquid M is also low, so that the thixotropy fluid constituting the mount liquid M has a high viscosity. In this state, since the viscous resistance of the mounting liquid M is large, it is difficult for the mounting liquid M to pass through each of the small holes 35 of the partition portion 34. Therefore, all or most of the mounting liquid M that has flowed from the first liquid chamber 10 into the first end portion 31a of the main passage portion 31 passes through the main passage portion 31 without passing through the small holes 35 of the partition portion 34. It flows from the first end 31a to the second end 31b and flows into the second liquid chamber 11 from the second end 31b of the main passage portion 31 (see the solid line arrow in FIG. 3). That is, the mount liquid M mainly flows only in the main passage portion 31.

On the other hand, when the flow velocity of the mount liquid M increases, the shear rate of the mount liquid M also increases, so that the viscosity of the thixotropy fluid constituting the mount liquid M decreases. Correspondingly, the viscous resistance of the mounting liquid M becomes small, and the mounting liquid M easily passes through each of the small holes 35 of the partition portion 34. Therefore, a part of the mounting liquid M that has flowed from the first liquid chamber 10 into the first end portion 31a of the main passage portion 31 passes through each of the small holes 35 of the partition portion 34 and passes through each small hole 35 of the partition portion 34, and the first end of the sub-passage portion 32 It flows into the portion 32a. The mount liquid M that has flowed into the first end portion 32a of the sub-passage portion 32 flows through the sub-passage portion 32 from the first end portion 32a to the second end portion 32b, and from the second end portion 32b of the sub-passage portion 32. It flows into the second liquid chamber 11 (see the dotted arrow in FIG. 3). On the other hand, another part of the mount liquid M that has flowed from the first liquid chamber 10 into the first end portion 31a of the main passage portion 31 has the main passage portion 31 as the same as when the flow velocity of the mount liquid M is low. It flows from the first end 31a to the second end 31b and flows into the second liquid chamber 11 from the second end 31b of the main passage portion 31 (see the solid line arrow in FIG. 3). That is, the mounting liquid M flows through both the main passage portion 31 and the sub-passage portion 32.

<Effect>
As described above, in the present embodiment, the sub-passage portion 32 is provided with a partition portion 34 that increases the inflow amount of the mounting liquid M into the sub-passage portion 32 according to the decrease in the viscosity of the thixotropy fluid. Therefore, the vibration damping characteristic of the engine mount 1 can be changed without using a mechanism for mechanically changing the orifice passage 12, and an increase in the number of parts of the engine mount 1 can be suppressed. Further, the vibration damping characteristic of the engine mount 1 can be changed without using a moving part such as a valve, and the durability of the engine mount 1 can be improved.

Further, the partition portion 34 is provided in the communication portion of the sub-passage portion 32 with the main passage portion 31. As a result, when the thixotropy fluid has a high viscosity, the mount liquid M mainly flows only through the main passage portion 31, and when the thixotropy fluid viscosity decreases, the mount liquid M flows through both the main passage portion 31 and the sub-passage portion 32. It will flow. Therefore, the vibration damping characteristics of the engine mount 1 can be freely changed by adjusting the shapes and sizes of the main passage portion 31 and the sub-passage portion 32.

Further, since the partition portion 34 is provided with a plurality of small holes 35, the amount of the mounting liquid M flowing from the main passage portion 31 into the sub-passage portion 32 can be gradually increased. Therefore, the vibration damping characteristic of the engine mount 1 can be continuously changed.

Further, the central axis Y of the plurality of small holes 35 is perpendicular to the axis X1 of the main passage portion 31. Therefore, it is possible to prevent a large amount of the mounting liquid M from flowing from the main passage portion 31 into the sub-passage portion 32 while the thixotropy fluid has a high viscosity.

Further, the engine mount 1 partially defines the first liquid chamber 10 and partially defines the elastically deformable first wall body 7 that supports the first mounting member 5 and the second liquid chamber 11. In addition, the elastically deformable second wall body 8 attached to the second mounting member 6 and the second liquid chamber 11 are coupled to the first wall body 7 in order to partition the first liquid chamber 10 from the first liquid chamber 10, and the orifice passage 12 Has a partition wall 9 provided with. Therefore, the vibration damping action of the engine mount 1 can be enhanced.

Further, since the non-Newtonian fluid constituting the mount liquid M is a thixotropy, the viscosity of the non-Newtonian fluid can be gradually reduced as the shear rate increases. Therefore, it is possible to suppress a sudden change in the vibration damping characteristic of the engine mount 1.

<Modification example>
In the orifice passage 12 according to the above embodiment, the central axis Y of the plurality of small holes 35 of the partition portion 34 is perpendicular to the axis X1 of the main passage portion 31. On the other hand, in the orifice passage 41 according to another different embodiment, as shown in FIG. 5, the central axis Y of the plurality of small holes 43 of the partition portion 42 is parallel to the axis X1 of the main passage portion 31. Is also good. According to this configuration, the mount liquid M can be smoothly flowed from the main passage portion 31 to the sub-passage portion 32 in a state where the viscosity of the thixotropy fluid is lowered.

In the orifice passage 12 according to the above embodiment, the main passage portion 31 communicates the first liquid chamber 10 and the second liquid chamber 11 with each other, and the sub-passage portion 32 communicates the main passage portion 31 and the second liquid chamber 11 with each other. Communicating. On the other hand, in the orifice passage 51 according to another different embodiment, as shown in FIG. 6, the main passage portion 52 and the sub-passage portion 53 communicate with each other the first liquid chamber 10 and the second liquid chamber 11, respectively. You may be. In this case, for example, a partition portion 54 (an example of an inflow variable structure) is provided at the first end portion 53a of the sub-passage portion 53 (that is, the communication portion between the sub-passage portion 53 and the first liquid chamber 10), and the partition portion 54 is provided. A plurality of small holes 55 may be provided in the hole 55.

In the above embodiment, the main passage portion 31 and the sub passage portion 32 of the orifice passage 12 are curved in an arc shape in the axial direction thereof. On the other hand, in another different embodiment, the main passage portion 31 and / or the sub passage portion 32 of the orifice passage 12 may extend linearly in the axial direction thereof.

In the above embodiment, the engine mount 1 that supports the engine 2 is used as an example of the vehicle vibration isolator. On the other hand, in other different embodiments, the motor mount that supports the motor may be used as an example of the vehicle vibration isolator, and the shock absorber used for the suspension may be used as an example of the vehicle vibration isolator. That is, the vehicle vibration isolator according to the present invention can be applied to any place in the vehicle where vibration damping is required.

Although the description of the specific embodiment is completed above, the present invention is not limited to the above-described embodiment and modification, and can be widely modified.

1: Engine mount (an example of vehicle vibration isolation device)
2: Engine (an example of the first member)
3: Body (an example of the second member)
5: 1st mounting member 6: 2nd mounting member 7: 1st wall body 8: 2nd wall body 9: Partition wall 10: 1st liquid chamber 11: 2nd liquid chamber 12: Orifice passage 31: Main passage portion 32: Sub-passage portion 34: Partition portion (example of variable inflow amount structure)
35: Small hole 41: Orifice passage 42: Partition (example of variable inflow amount structure)
43: Small hole M: Mounting liquid (example of liquid)

Claims (8)

The first mounting member to be attached to the first member,
The second mounting member to be attached to the second member,
A first liquid chamber and a second liquid chamber whose volume is changed according to the relative displacement of the first mounting member and the second mounting member.
A vehicle vibration isolator provided with an orifice passage for flowing a liquid between the first liquid chamber and the second liquid chamber according to a change in the volume of the first liquid chamber and the second liquid chamber. ,
The liquid comprises a non-Newtonian fluid whose viscosity decreases with increasing shear rate.
The orifice passage includes a main passage portion that communicates the first liquid chamber and the second liquid chamber with each other, and a sub-passage portion parallel to the main passage portion, and the sub-passage portion includes the non-Newtonian. A vehicle vibration isolator provided with a variable inflow amount structure that increases the inflow amount of the liquid into the sub-passage portion according to a decrease in the viscosity of the fluid. The vehicle vibration isolator according to claim 1, wherein the variable inflow structure is provided at a communication portion with the main passage portion in the sub-passage portion. The second aspect of the present invention is characterized in that the variable inflow structure includes a partition portion for partitioning the sub-passage portion with respect to the main passage portion, and the partition portion is provided with a plurality of small holes. The vehicle anti-vibration device described. The vehicle vibration isolator according to claim 3, wherein the central axis of the plurality of small holes is perpendicular to the axis of the main passage portion. The vehicle vibration isolator according to claim 3, wherein the central axis of the plurality of small holes is parallel to the axis of the main passage portion. The vehicle vibration isolator according to any one of claims 3 to 5, wherein the plurality of small holes have a diameter of 50 μm or more and 3 mm or less. An elastically deformable first wall body that partially defines the first liquid chamber and supports the first mounting member.
An elastically deformable second wall body that partially defines the second liquid chamber and is attached to the second mounting member.
Any one of claims 1 to 6, wherein the second liquid chamber is coupled to the first wall body so as to partition the first liquid chamber, and has a partition wall provided with the orifice passage. The vehicle anti-vibration device described in the section. The vehicle vibration isolator according to any one of claims 1 to 7, wherein the non-Newtonian fluid is a thixotropic fluid.

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