JP7038093B2 - Anti-vibration device for vehicles - Google Patents

Description

The present invention relates to a vehicle vibration isolator.

A vehicle vibration isolator that attenuates 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

In such a vehicle vibration isolator, the required liquid viscosity differs depending on the frequency range in which vibration occurs. For example, in the frequency region where the amount of vibration damping is maximum, it is required to reduce the viscosity of the liquid in order to sufficiently dampen the vibration by utilizing the so-called liquid column resonance phenomenon. On the other hand, in a frequency region lower than the above frequency region, it is required to increase the viscosity of the liquid in order to sufficiently attenuate the vibration by utilizing the so-called viscosity damping.

In order to meet such various demands for the viscosity of the liquid, it is desirable to increase the amount of change in the viscosity of the liquid. However, the conventional anti-vibration device for vehicles has not been devised to increase the amount of change in the viscosity of the liquid. Therefore, there is a possibility that the vibration cannot be sufficiently attenuated in a wide frequency range.

In view of the above background, it is an object of the present invention to provide a vehicle vibration isolator that sufficiently attenuates vibration in a wide frequency range.

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). A second mounting member (6) mounted on the first liquid chamber (10) and a 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. It includes a sub-passage portion (32) that joins the passage portion.

According to this aspect, the liquid can be turbulently flowed at the confluence of the main passage portion and the sub-passage portion, and the shear rate of the liquid can be increased. Therefore, the viscosity of the liquid can be sufficiently lowered and the amount of change in the viscosity of the liquid can be increased. This makes it possible to sufficiently attenuate the vibration in a wide frequency range.

In the above embodiment, the sub-passage portion may communicate the first liquid chamber or the second liquid chamber with the main passage portion.

According to this aspect, a sufficient amount of liquid can flow from the first liquid chamber or the second liquid chamber into the main passage portion through the sub-passage portion. Therefore, it becomes easy to increase the degree of turbulence of the liquid at the confluence of the main passage portion and the sub passage portion.

In the above aspect, the plurality of sub-passage portions are provided, and the plurality of sub-passage portions are a first sub-passage portion (52) in which the first liquid chamber and the main passage portion communicate with each other, and the above-mentioned. A second sub-passage portion (53) that communicates the second liquid chamber and the main passage portion with each other may be included.

According to this aspect, when the liquid flows from the first liquid chamber to the second liquid chamber, the liquid is turbulently flowed at the confluence of the main passage portion and the first sub passage portion, and the first liquid is turbulent from the second liquid chamber. When the liquid flows toward the chamber, the liquid can be turbulent at the confluence of the main passage portion and the second sub passage portion. As a result, the viscosity of the liquid can be further reduced, and the amount of change in the viscosity of the liquid can be further increased.

In the above aspect, the sub-passage portion may communicate with each other at two different points of the main passage portion.

According to this aspect, the sub-passage portion communicates only with the main passage portion, and it is not necessary to provide a communication port with the sub-passage portion in the first liquid chamber and the second liquid chamber. Therefore, it is possible to suppress the complexity of the configuration of the first liquid chamber and the second liquid chamber.

In the above embodiment, the vehicle vibration isolator has an 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) that 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 (9) coupled to the wall and provided with the orifice passage.

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

In the above aspect, the orifice passage may be partially defined by an outer peripheral groove (27) provided on the outer peripheral surface of the partition wall.

According to this aspect, it becomes easier to secure the length in the axial direction of the orifice passage as compared with the case where the orifice passage is formed in the inner peripheral portion of the partition wall. Therefore, the vibration damping action of the vehicle vibration isolator can be further enhanced.

In the above aspect, the main passage portion may be provided in a spiral shape.

According to this aspect, it becomes easier to secure the length of the main passage portion in the axial direction as compared with the case where substantially the entire main passage portion is provided on the same plane. Therefore, it is possible to enhance the vibration damping action of the vehicle vibration isolator.

In the above aspect, substantially the entire main passage portion may be provided on the same plane.

According to this aspect, the installation space of the main passage portion can be reduced as compared with the case where the main passage portion is provided in a spiral shape. Therefore, the vehicle vibration isolator can be made compact.

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 abrupt changes in the vibration damping characteristics of the vehicle vibration isolator.

According to the above configuration, it is possible to provide a vehicle vibration isolator that sufficiently attenuates vibration in a wide frequency range.

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 perspective view showing an orifice passage according to an embodiment of the present invention. Schematic perspective view showing an orifice passage according to the first modification of the present invention. Schematic perspective view showing an orifice passage according to a second modification of the present invention. Schematic perspective view showing an orifice passage according to a third modification of the present invention. Schematic side view showing an orifice passage according to a fourth modification of the present invention. FIG. 7 is a cross-sectional view taken along the line VIII-VIII. Schematic side view showing an orifice passage according to a fifth modification 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 8 arranged below the first wall 7, a partition wall 9 arranged between the first wall 7 and the second wall 8, and a first partition wall 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 a bolt 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 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 concave portion 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 8 is made 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 mounting 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 to 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 attenuated.

<Mount liquid M>
The mount liquid M is composed only of a 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 thixotropic fluid gradually decreases as the shear rate increases. In another different embodiment, a fluid other than the thixotropic fluid (for example, a Bingham fluid) may be used as the non-Newtonian fluid constituting the mount liquid M.

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

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

The main passage portion 31 of the orifice passage 12 is curved in an arc shape in the axial direction (longitudinal direction) thereof. The main passage portion 31 is provided in a spiral 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 curved in an arc shape in the axial direction (longitudinal direction) thereof. The first end portion 32a of the sub-passage portion 32 communicates with the first liquid chamber 10, and the second end portion 32b of the sub-passage portion 32 is an intermediate portion (first end portion 31a and second end) of the main passage portion 31. It joins the part between the parts 31b) at the merging part X. That is, the sub-passage portion 32 communicates the first liquid chamber 10 and the main passage portion 31 with each other.

<Action of orifice passage 12>
The dotted line arrow in FIG. 3 indicates the flow of the mount liquid M from the first liquid chamber 10 to the second liquid chamber 11.

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 flows through the main passage portion 31 from the first end portion 31a toward the second end portion 31b, and flows through the main passage portion 31. It flows into the second liquid chamber 11 from the second end portion 31b of the above. On the other hand, the mount liquid M that has flowed from the first liquid chamber 10 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 toward the second end portion 32b, and is subordinate. It flows into the main passage portion 31 from the second end portion 32b of the passage portion 32. The mount liquid M that has flowed from the sub-passage portion 32 into the main passage portion 31 in this way joins the mount liquid M that flows through the main passage portion 31 at the confluence portion X. As a result, the mount liquid M is agitated and turbulent. As the flow velocity of the mount liquid M increases, the degree of turbulence of the mount liquid M increases.

If the inflow direction of the mount liquid M from the sub-passage portion 32 to the main passage portion 31 is opposite to the flow direction of the mount liquid M in the main passage portion 31, the flow of the mount liquid M in the main passage portion 31 will flow. It may get worse. Therefore, in the present embodiment, the shape and arrangement of the sub-passage portion 32 are arranged so that the inflow direction of the mount liquid M from the sub-passage portion 32 to the main passage portion 31 follows the flow direction of the mount liquid M in the main passage portion 31. It has been adjusted.

<Effect>
As described above, in the present embodiment, the mount liquid M can be turbulently flowed at the confluence portion X of the main passage portion 31 and the sub-passage portion 32, and the shear rate of the thixotropy fluid constituting the mount liquid M can be increased. .. Therefore, the viscosity of the thixotropy can be sufficiently reduced and the amount of change in the viscosity of the thixotropy can be increased as compared with the case where the confluence X of the main passage portion 31 and the sub-passage portion 32 does not exist. See Figure 2). As a result, in the frequency region where the amount of vibration damping is maximum, the viscosity of the mount liquid M can be sufficiently reduced, and the vibration can be sufficiently damped by utilizing the so-called liquid column resonance phenomenon. On the other hand, in the frequency region lower than the above frequency region, the viscosity of the mount liquid M can be sufficiently increased, and the vibration can be sufficiently damped by utilizing the so-called viscous damping. That is, the vibration can be sufficiently attenuated in a wide frequency range.

Further, since the sub-passage portion 32 communicates the first liquid chamber 10 and the main passage portion 31 with each other, a sufficient amount of mounting liquid is attached to the main passage portion 31 from the first liquid chamber 10 via the sub-passage portion 32. M can flow in. Therefore, it becomes easy to increase the degree of turbulence of the mount liquid M at the confluence portion X of the main passage portion 31 and the sub-passage portion 32.

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 8 attached to the second mounting member 6 and the second liquid chamber 11 are coupled to the first wall 7 so as to be partitioned from the first liquid chamber 10, and the orifice passage 12 It has a partition wall 9 provided with. Therefore, the vibration damping action of the engine mount 1 can be enhanced.

Further, the orifice passage 12 is partially defined by the outer peripheral groove 27 provided on the outer peripheral surface of the partition wall 9. Therefore, it becomes easier to secure the length of the orifice passage 12 in the axial direction as compared with the case where the orifice passage 12 is formed in the inner peripheral portion of the partition wall 9. Therefore, the vibration damping action of the engine mount 1 can be further enhanced.

Further, since the main passage portion 31 is provided in a spiral shape, the length of the main passage portion 31 in the axial direction is secured as compared with the case where substantially the entire main passage portion 31 is provided on the same plane. It will be easier. Therefore, the vibration damping action of the engine mount 1 can be further enhanced.

Further, since the non-Newtonian fluid constituting the mount liquid M is a thixofluid, 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>
Hereinafter, suitable modifications of the present invention will be described. However, the description of the same items as in the above embodiment will be omitted.

<First modification>
FIG. 4 shows an orifice passage 41 according to a first modification of the present invention. The dotted line arrow in FIG. 4 indicates the flow of the mount liquid M from the second liquid chamber 11 to the first liquid chamber 10.

In the orifice passage 41, the first end portion 42a of the sub-passage portion 42 communicates with the second liquid chamber 11, and the second end portion 42b of the sub-passage portion 42 joins the intermediate portion of the main passage portion 31 at the confluence portion X. It is merging. That is, the sub-passage portion 42 communicates the second liquid chamber 11 and the main passage portion 31 with each other.

According to the configuration of the first modification, a sufficient amount of the mount liquid M can flow from the second liquid chamber 11 into the main passage portion 31 via the sub-passage portion 42. Therefore, it becomes easy to increase the degree of turbulence of the mount liquid M at the confluence portion X of the main passage portion 31 and the sub-passage portion 42.

<Second modification>
FIG. 5 shows an orifice passage 51 according to a second modification of the present invention. The two-dot chain arrow in FIG. 5 indicates the flow of the mount liquid M from the first liquid chamber 10 to the second liquid chamber 11, and the two-dot chain arrow in FIG. 5 indicates the flow from the second liquid chamber 11 to the second liquid chamber 11. The flow of the mount liquid M toward the liquid chamber 10 is shown.

The orifice passage 51 includes a first sub-passage portion 52 and a second sub-passage portion 53. The first end portion 52a of the first sub-passage portion 52 communicates with the first liquid chamber 10, and the second end portion 52b of the first sub-passage portion 52 has a first confluence portion X1 in the middle portion of the main passage portion 31. We are merging at. That is, the first sub-passage portion 52 communicates the first liquid chamber 10 and the main passage portion 31 with each other. The first end portion 53a of the second sub-passage portion 53 communicates with the second liquid chamber 11, and the second end portion 53b of the second sub-passage portion 53 has a second confluence portion X2 in the middle portion of the main passage portion 31. We are merging at. That is, the second sub-passage portion 53 communicates the second liquid chamber 11 and the main passage portion 31 with each other.

According to the configuration of the second modification, when the mount liquid M flows from the first liquid chamber 10 to the second liquid chamber 11, the mount liquid M is turbulently flowed at the first confluence portion X1 to make the mount liquid M turbulent, and the second liquid chamber 11 When the mount liquid M flows from the first liquid chamber 10 toward the first liquid chamber 10, the mount liquid M can be turbulent at the second merging portion X2. As a result, the viscosity of the mount liquid M can be further reduced, and the amount of change in the viscosity of the mount liquid M can be further increased.

<Third modification example>
FIG. 6 shows an orifice passage 61 according to a third modification of the present invention. The dotted line arrow in FIG. 6 indicates the flow of the mount liquid M from the first liquid chamber 10 to the second liquid chamber 11.

In the orifice passage 61, the first end portion 62a of the sub-passage portion 62 joins the intermediate portion of the main passage portion 31 at the first confluence portion X1, and the second end portion 62b of the sub-passage portion 62 is the main passage portion 31. It joins the middle part of the above at the second merging part X2. That is, the sub-passage portion 62 communicates with each other at two different points of the main passage portion 31.

According to the configuration of the third modification, the sub-passage portion 62 communicates with only the main passage portion 31, and it is necessary to provide a communication port with the sub-passage portion 62 in the first liquid chamber 10 and the second liquid chamber 11. Will disappear. Therefore, it is possible to suppress the complexity of the configuration of the first liquid chamber 10 and the second liquid chamber 11.

<Fourth modification>
7 and 8 show an orifice passage 71 according to a fourth modification of the present invention. The dotted line arrows in FIGS. 7 and 8 indicate the flow of the mount liquid M from the first liquid chamber 10 to the second liquid chamber 11.

In the orifice passage 71, the main passage portion 72 has a substantially annular shape, and substantially the entire main passage portion 72 is provided on the same plane.

According to the configuration of the fourth modification, the installation space of the main passage portion 72 can be reduced as compared with the case where the main passage portion 72 is provided in a spiral shape. Therefore, the engine mount 1 can be made compact.

<Fifth variant>
FIG. 9 shows an orifice passage 81 according to a fifth modification of the present invention.

The engine mount 1 (the whole is not shown) includes a pair of first liquid chambers 10a and 10b and a second liquid chamber 11. The pair of first liquid chambers 10a and 10b may be provided in individual parts, or may be provided in the same part and partitioned by a partition wall (not shown).

The orifice passage 81 includes a main passage portion 82 and a sub passage portion 83. The first end portion 82a of the main passage portion 82 communicates with the first liquid chamber 10a, and the second end portion 82b of the main passage portion 82 communicates with the second liquid chamber 11. That is, the main passage portion 82 communicates the first liquid chamber 10a and the second liquid chamber 11 with each other. The first end portion 83a of the sub-passage portion 83 communicates with the first liquid chamber 10b, and the second end portion 83b of the sub-passage portion 83 communicates with the intermediate portion of the main passage portion 82. That is, the sub-passage portion 83 communicates with each other between the first liquid chamber 10b and the intermediate portion of the main passage portion 82.

<Other variants>
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 taken 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 or 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 27: outer peripheral groove 31: main Passage portion 32: Sub-passage portion 41: Orifice passage 42: Sub-passage portion 51: Orifice passage 52: First sub-passage portion 53: Second sub-passage portion 61: Orifice passage 62: Sub-passage portion 71: Orifice passage 72: Main Passage M: Mount liquid (example of liquid)

Claims (9)

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 between 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.
An anti-vibration device for a vehicle, wherein 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 that joins the main passage portion. The vehicle vibration isolator according to claim 1, wherein the sub-passage portion communicates the first liquid chamber or the second liquid chamber with the main passage portion. A plurality of the sub-passage portions are provided, and the sub-passage portion is provided.
A first sub-passage portion in which the plurality of sub-passage portions communicate with each other between the first liquid chamber and the main passage portion, and a second sub-passage portion in which the second liquid chamber and the main passage portion communicate with each other. The vehicle anti-vibration device according to claim 1, wherein the anti-vibration device comprises. The vehicle vibration isolator according to claim 1, wherein the sub-passage portion communicates with each other at two different portions of the main passage portion. 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 4, 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. Anti-vibration device for vehicles as described in the section. The vehicle vibration isolator according to claim 5, wherein the orifice passage is partially defined by an outer peripheral groove provided on the outer peripheral surface of the partition wall. The vehicle vibration isolator according to any one of claims 1 to 6, wherein the main passage portion is provided in a spiral shape. The vehicle vibration isolator according to any one of claims 1 to 6, wherein substantially the entire main passage portion is provided on the same plane. The vehicle vibration isolator according to any one of claims 1 to 8, wherein the non-Newtonian fluid is a thixotropic fluid.

Images