JP2024060810A - Liquid-filled anti-vibration device - Google Patents

Abstract

[Problem] To provide a liquid-filled vibration-proof device capable of suppressing abnormal noises generated when a movable plate comes into contact with a grid. [Solution] Since a plurality of first protrusions 25 protrude from a plurality of first grids 23b of a first partition plate 23 toward a movable plate 30, the deformation or displacement of the movable plate 30 toward the first partition plate 23 can be restricted by the first protrusions 25. Furthermore, by providing the first protrusions 25 on the first grid 23b, the movable plate 30 can be made lighter than when a protrusion for restricting the deformation or displacement is provided on the movable plate 30. As a result, the energy of the impact sound generated by contact between the first grid 23b and the movable plate 30 can be reduced, and abnormal noises caused by the impact sound can be suppressed. [Selected Figure] Figure 1

Description

The present invention relates to a liquid-filled vibration-proof device, and in particular to a liquid-filled vibration-proof device that can suppress abnormal noises that occur when a movable plate comes into contact with a grid.

As an example of an anti-vibration device that supports a vibration source such as an engine on a vehicle body (support side), a liquid-filled anti-vibration device disclosed in Patent Document 1 is known. In the liquid-filled anti-vibration device disclosed in Patent Document 1, a liquid chamber formed inside is divided into a first liquid chamber and a second liquid chamber by a partition body. The partition body includes a first partition plate facing the first liquid chamber, a second partition plate facing the second liquid chamber, and a movable plate arranged between the first partition plate and the second partition plate and made of a disk-shaped elastic body.

The first and second partition plates have a number of through holes formed in a line in the circumferential direction that penetrate the plate thickness direction, and a lattice is formed between the multiple through holes. The liquid pressure in the first and second liquid chambers is applied to the movable plate via the through holes, and the movable plate is deformed or displaced, thereby consuming the vibration energy input to the liquid-filled vibration-damping device. Furthermore, the deformation or displacement of the movable plate is regulated by the protrusions protruding from the movable plate hitting the lattice of the first and second partition plates.

JP 2013-32828 A

However, in Patent Document 1, there is a possibility that the disk-shaped movable plate may rotate in the circumferential direction when the movable plate is assembled to the first and second partition plates or during use, so it is necessary to form the protrusions in an annular shape to contact the grid. In this way, the weight of the movable plate increases because protrusions are provided on the parts that do not contact the grid and that face the through holes. As a result, the energy required to generate the hitting sound caused by the contact between the movable plate and the grid increases, and there is a risk of deterioration in noise performance.

The present invention has been made to solve the above-mentioned problems, and aims to provide a liquid-filled vibration isolation device that can suppress abnormal noise when the movable plate comes into contact with the grid.

To achieve this objective, the liquid-filled vibration-proof device of the present invention comprises a first member and a cylindrical second member, an elastic vibration-proof base connecting the first member and the second member, an elastic diaphragm attached to the second member to form a liquid chamber filled with liquid between the vibration-proof base, a partition body dividing the liquid chamber into a first liquid chamber and a second liquid chamber, and an orifice connecting the first liquid chamber and the second liquid chamber. The partition body comprises a first partition plate facing the first liquid chamber, having a plurality of first through holes that penetrate the plate thickness direction and are arranged in the circumferential direction, and a plurality of first lattices formed between the plurality of first through holes, a second partition plate facing the second liquid chamber, and a movable plate made of an elastic material and arranged between the first partition plate and the second partition plate so as to face the plurality of first through holes and the first lattice, and a plurality of first protrusions protrude from the plurality of first lattices toward the movable plate.

According to the liquid-filled vibration-proof device described in claim 1, since multiple first protrusions protrude from multiple first lattices of the first partition plate toward the movable plate, the deformation or displacement of the movable plate toward the first partition plate can be restricted by the first protrusions. Furthermore, by providing the first protrusions on the first lattice, the movable plate can be made lighter than when a protrusion for restricting the deformation or displacement is provided on the movable plate. As a result, the energy of the impact sound generated by contact between the first lattice and the movable plate can be reduced, and abnormal noise due to the impact sound can be suppressed.

According to the liquid-filled vibration-proof device of claim 2, in addition to the effects of the liquid-filled vibration-proof device of claim 1, the following effects are achieved. The second partition plate has a plurality of second through holes that penetrate the part facing the movable plate in the plate thickness direction and are arranged in the circumferential direction, and a plurality of second lattices formed between the plurality of second through holes. Since a plurality of second protrusions protrude from this second lattice toward the movable plate, the deformation or displacement of the movable plate toward the second partition plate can be restricted by the second protrusions. Furthermore, by providing the second protrusions on the second lattice, the movable plate can be made lighter than when a protrusion for restricting the deformation or displacement is provided on the movable plate. Therefore, the energy of the impact sound generated by the contact between the first partition plate and the second partition plate and the movable plate can be reduced, and abnormal noise due to the impact sound can be suppressed.

The liquid-filled vibration-proof device of claim 3 achieves the following effect in addition to the effect achieved by the liquid-filled vibration-proof device of claim 2. The multiple first lattices and the multiple second lattices are arranged offset from each other in the circumferential direction. This makes it possible to prevent distortion caused when the first protrusions protruding from the first lattice and the second protrusions protruding from the second lattice come into contact with the movable plate from concentrating in a portion of the movable plate in the circumferential direction. As a result, the durability of the movable plate can be improved.

According to the liquid-filled vibration-proof device of claim 4, in addition to the effect of the liquid-filled vibration-proof device of any one of claims 1 to 3, the following effect is achieved. Some of the multiple first protrusions have different heights. As a result, when the movable plate is deformed or displaced toward the first partition plate, the multiple first protrusions that come into contact with the movable plate gradually increase, and the deformation or displacement is regulated. As a result, abnormal noise when the first protrusions come into contact with the movable plate can be suppressed compared to when all of the first protrusions come into contact with the movable plate at approximately the same timing.

According to the liquid-filled vibration-proof device of claim 5, in addition to the effects of the liquid-filled vibration-proof device of any one of claims 1 to 3, the following effect is achieved. Some of the multiple first protrusions have a position where they protrude from the first lattice that is shifted in the radial direction. As a result, depending on how the movable plate is deformed or displaced toward the first partition plate, the multiple first protrusions that come into contact with the movable plate gradually increase, and the deformation or displacement may be restricted. In this case, abnormal noise when the first protrusions come into contact with the movable plate can be suppressed compared to when all of the first protrusions come into contact with the movable plate at approximately the same timing.

According to the liquid-filled vibration-proof device of claim 6, in addition to the effects of the liquid-filled vibration-proof device of any one of claims 1 to 3, the following effects are achieved. The first partition plate has an annular portion that extends from the first lattice to at least one of the outer and inner sides in the radial direction and is continuous in the circumferential direction. The movable plate has an annular protrusion that protrudes so as to be able to come into contact with this annular portion. The first protrusion is lower than this annular protrusion. Therefore, even when the annular protrusion is in contact with the annular portion, the movable plate can be deflected toward the first protrusion, and the damping performance due to this deflection can be ensured.

According to the liquid-filled vibration-proof device of claim 7, in addition to the effects of the liquid-filled vibration-proof device of any one of claims 1 to 3, the following effects are achieved. The movable plate formed in a disk or annular plate shape floats in the liquid so as to be rotatable in the circumferential direction of the movable plate relative to the first and second partition plates. The contact position of the first protrusion with respect to the movable plate changes in response to the rotation of the movable plate. Therefore, the distortion caused by contact with the first protrusion can be prevented from concentrating in a portion of the circumferential direction of the movable plate, thereby improving the durability of the movable plate.

1 is a cross-sectional view of a liquid-sealed vibration-proof device according to a first embodiment. FIG. FIG. 3 is a cross-sectional view of the partition taken along line III-III in FIG. 2. FIG. 11 is a cross-sectional view of a partition body in a second embodiment. FIG. 13 is a plan view of a partition in the third embodiment.

Preferred embodiments will now be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a liquid-filled vibration-damping device 10 in a first embodiment. FIG. 1 shows an unloaded state in which no vibration (load) is input to the liquid-filled vibration-damping device 10. Unless otherwise specified, the unloaded state will be described for each part of the liquid-filled vibration-damping device 10. In the following description, the upper side of the paper in FIG. 1 will be described as the upper side of the liquid-filled vibration-damping device 10, but the top and bottom of this liquid-filled vibration-damping device 10 do not necessarily coincide with the top and bottom of the vehicle to which the liquid-filled vibration-damping device 10 is attached.

The liquid-sealed vibration-damping device 10 is an engine mount that elastically supports an automobile engine. The liquid-sealed vibration-damping device 10 mainly comprises a first member 11 that is attached to the engine side, which is the vibration source, a cylindrical second member 12 that is attached to the vehicle body on the support side, and a vibration-damping base 13 composed of an elastic body that connects the first member 11 and the second member 12. Note that the cross-sectional view of the liquid-sealed vibration-damping device 10 in Figure 1 is an axial cross-sectional view including the axis C of the cylindrical second member 12. The axis C direction (axial direction) is the up-down direction of the liquid-sealed vibration-damping device 10.

The first member 11 is a boss fitting arranged on the axis C so as to be located above the second member 12, and is made of a metal such as steel or an aluminum alloy. A bolt hole is formed in the upper end surface of the first member 11. The first member 11 is attached to the engine side via a bolt attached to the bolt hole.

The second member 12 is a cylindrical member centered on the axis C, and is mainly made of metal such as steel. The second member 12 has a large diameter portion 12a at the upper end, a reduced diameter portion 12b that is connected to the lower end of the large diameter portion 12a and has a gradually decreasing inner and outer diameter toward the bottom, and a small diameter portion 12c that is connected to the lower end of the reduced diameter portion 12b and has a smaller inner and outer diameter than the large diameter portion 12a. For example, the second member 12 is attached to the vehicle body by inserting it into a cylindrical bracket provided on the vehicle body.

The vibration-isolating base 13 is a member made of an elastic material such as rubber or a thermoplastic elastomer formed into a roughly umbrella shape. The vibration-isolating base 13 is vulcanization-bonded to the lower part of the first member 11 and to the inner circumferential surfaces of the large diameter portion 12a and the reduced diameter portion 12b, connecting them together. A rubber membrane-like membrane portion 14 that covers the inner circumferential surface of the small diameter portion 12c is connected to the lower end of the vibration-isolating base 13. This membrane portion 14 is part of the second member 12.

A diaphragm 15 is attached to the second member 12 via an attachment portion 16 so as to close the lower end opening of the small diameter portion 12c. The diaphragm 15 is a membrane made of an elastic material such as rubber. The attachment portion 16 is an annular member made of a metal such as steel. The outer periphery of the diaphragm 15 is vulcanization bonded all around to the inner periphery of the attachment portion 16.

A liquid chamber is formed by the sealed space partitioned by the vibration-isolating base 13, the second member 12, and the diaphragm 15. An antifreeze liquid (not shown) such as ethylene glycol is sealed in the liquid chamber. The liquid chamber is partitioned by a partition 20 into a first liquid chamber 17, in which the vibration-isolating base 13 forms part of the chamber wall, and a second liquid chamber 18, in which the diaphragm 15 forms part of the chamber wall.

To attach the diaphragm 15 and the partition 20 to the second member 12, first, the partition 20 is inserted into the small diameter portion 12c of the second member 12 until it hits the step 13a of the vibration-isolating base 13 that protrudes radially inward from the upper end of the membrane portion 14. Next, the mounting portion 16 to which the diaphragm 15 is integrated is inserted into the small diameter portion 12c, and the small diameter portion 12c (second member 12) is then reduced in diameter by drawing, and the outer periphery of the partition 20 and the mounting portion 16 is held by the membrane portion 14. This attaches the diaphragm 15 and the partition 20 to the second member 12.

The partition body 20 will be described with reference to Figs. 2 and 3 in addition to Fig. 1. Fig. 2 is a plan view of the partition body 20. Fig. 1 shows a cross section of the partition body 20 taken along line I-I in Fig. 2. In Fig. 2, a plurality of first protrusions 25 are shown by dashed lines. Fig. 3 is a cross section of the partition body 20 taken along line III-III in Fig. 2. In Fig. 3, the boundary between the first lattice 23b and the first protrusions 25, and the boundary between the second lattice 26b and the second protrusions 28 are shown by dashed lines.

As shown in Figures 1 and 2, the partition body 20 includes a cylindrical member 21 held inside the membrane portion 14, a flat first partition plate 23 and a flat second partition plate 26 that separate the inner periphery side of the cylindrical member 21 into upper and lower parts, and a movable plate 30 disposed between the first partition plate 23 and the second partition plate 26. The first partition plate 23 facing the first liquid chamber 17 and the second partition plate 26 facing the second liquid chamber 18 are stacked one on top of the other and joined by welding, bonding, or press-fitting.

The tubular member 21 is a cylindrical part made of metal or synthetic resin. The outer peripheral surface of the tubular member 21 is pressed against the small diameter portion 12c of the second member 12 via the membrane portion 14 over the entire circumference. An outer peripheral groove 22 having a length of approximately two circumferences is formed on the outer peripheral surface of the tubular member 21. The first orifice 19 is formed between this outer peripheral groove 22 and the membrane portion 14.

One end of the outer peripheral groove 22 opens onto the inner peripheral surface of the tubular member 21 above the first partition plate 23 or opens onto the upper end of the tubular member 21, so that the first orifice 19 communicates with the first liquid chamber 17. The other end of the outer peripheral groove 22 opens onto the inner peripheral surface of the tubular member 21 below the second partition plate 26 or opens onto the lower end of the tubular member 21, so that the first orifice 19 communicates with the second liquid chamber 18.

In this way, the first orifice 19 is a flow passage that connects the first fluid chamber 17 and the second fluid chamber 18. The flow passage cross-sectional area, length, cross-sectional circumference, etc. of the first orifice 19 are set so that the damping coefficient is large in a frequency band corresponding to the shake vibration (e.g., about 5 to 15 Hz) when a large amplitude shake vibration is input, for example, in order to damp shake vibrations when the vehicle is running.

The first partition plate 23 is made of metal or synthetic resin and is formed into a disk shape perpendicular to the axis C. A cylindrical base portion 23a, centered on the axis C, protrudes downward (towards the second partition plate 26) from the radial center of the first partition plate 23.

The first partition plate 23 has a plurality of first through holes 24 formed in the plate thickness direction (vertical direction) radially outside the base portion 23a. The first through holes 24 are arranged in a line in the circumferential direction. A plurality of first lattices 23b are formed between the first through holes 24. The first lattices 23b extend radially with a substantially constant width from the axis C as the center.

A number of first protrusions 25 protrude downward from the radial center of each of the first lattices 23b. One first protrusion 25 is provided for each first lattice 23b. The first protrusions 25 are formed in a truncated cone shape.

The first partition plate 23 has an inner annular portion 23c that extends radially inward from the first lattice 23b and is continuous in the circumferential direction, and an outer annular portion 23d that extends radially outward from the first lattice 23b and is continuous in the circumferential direction. The inner annular portion 23c is a portion that radially connects the first lattice 23b and the base portion 23a. The outer annular portion 23d extends to the inner peripheral surface of the tubular member 21.

A cylindrical portion 23e extends upward from the outer annular portion 23d, and a flange 23f extends radially outward from the upper edge of the cylindrical portion 23e. The first partition plate 23 is attached to the cylindrical member 21 by fitting the cylindrical portion 23e into the inner periphery of the cylindrical member 21 until the flange 23f contacts the upper end of the cylindrical member 21. The flange 23f that contacts the upper end of the cylindrical member 21 contacts the step 13a of the vibration-proof base 13. In addition, a portion of the cylindrical portion 23e and the flange 23f in the circumferential direction is omitted so as not to block the opening of the outer circumferential groove 22 on the first liquid chamber 17 side.

The second partition plate 26 is a part that is molded integrally with the tubular member 21, and is formed in a circular plate shape perpendicular to the axis C. The outer peripheral edge of the second partition plate 26 is connected to the inner peripheral surface of the tubular member 21 around the entire circumference, and a storage space 29 is formed between the first partition plate 23 and the second partition plate 26 that are attached to the tubular member 21.

A cylindrical base 26a, centered on the axis C, protrudes upward (toward the first partition plate 23) from the radial center of the second partition plate 26, facing the base 23a. The tips of this base 26a and the base 23a of the first partition plate 23 are joined by welding or the like. The storage space 29 is formed in a ring shape around the bases 23a and 26a.

The second partition plate 26 has a plurality of second through holes 27 formed in the plate thickness direction radially outside the base portion 26a. The second through holes 27 are arranged in a line in the circumferential direction. A plurality of second lattices 26b are formed between the second through holes 27. The second lattices 26b extend radially with a substantially constant width from the axis C as the center.

A number of second protrusions 28 protrude upward from the radial center of each of the second lattices 26b. One second protrusion 28 is provided for each second lattice 26b. The second protrusions 28 are formed in a truncated cone shape.

As shown in Figures 1 and 3, the second through-hole 27, the second lattice 26b, and the second protrusion 28 are symmetrically (mirrored) in shape, position, and dimensions (height H1, etc.) to the first through-hole 24, the first lattice 23b, and the first protrusion 25 of the first partition plate 23. Therefore, the bottom view of the partition body 20 is substantially the same as the plan view of the partition body 20 shown in Figure 2.

As shown in FIG. 1, the second partition plate 26 includes an inner annular portion 26c that extends radially inward from the second lattice 26b and is continuous in the circumferential direction, and an outer annular portion 26d that extends radially outward from the second lattice 26b and is continuous in the circumferential direction. The inner annular portion 26c is a portion that radially connects the second lattice 26b and the base portion 26a. The outer annular portion 26d extends to the inner peripheral surface of the tubular member 21.

The movable plate 30 is a member made of an elastic material such as rubber or a thermoplastic elastomer, and is formed in the shape of a circular plate centered on the axis C. The movable plate 30 is disposed in the storage space 29 between the first partition plate 23 and the second partition plate 26, and surrounds the base portions 23a and 26a.

The fluid pressure of the first fluid chamber 17 and the second fluid chamber 18 is applied to the movable plate 30 in the accommodation space 29 via the first through hole 24 and the second through hole 27 formed in the first partition plate 23 and the second partition plate 26, respectively. This fluid pressure causes the movable plate 30 to deform or displace, thereby consuming the vibration energy input to the fluid-filled vibration-proof device 10, and the vibration can be damped by the fluid-filled vibration-proof device 10.

The movable plate 30 has a flat plate-like shape at the portions facing the first through holes 24, the first lattice 23b, the second through holes 27, and the second lattice 26b. Furthermore, the movable plate 30 has an annular protrusion 31 protruding toward the inner annular portion 23c, an annular protrusion 32 protruding toward the outer annular portion 23d, an annular protrusion 33 protruding toward the inner annular portion 26c, and an annular protrusion 34 protruding toward the outer annular portion 26d.

Each of the annular protrusions 31 to 34 is a continuous circular portion around the entire circumference, and two are arranged on a concentric circle centered on the axis C. The annular protrusions 31 and 33 are arranged alternately on both the top and bottom surfaces. Similarly, the annular protrusions 32 and 34 are arranged alternately on both the top and bottom surfaces. This makes it possible to reduce the difference in rigidity between the thick and thin parts of the movable plate 30 compared to when each protrusion is arranged in the same position on both the top and bottom surfaces. As a result, it is possible to suppress the tendency for cracks to occur starting from the thin parts of the movable plate 30, and the durability of the movable plate 30 can be improved.

The height H2 of the annular protrusions 31-34 is the same, and the vertical dimension of the storage space 29 is greater than the overall thickness of the movable plate 30 (the vertical distance between the tips of the annular protrusions 31-34 on both the upper and lower sides). Furthermore, the inner diameter of the storage space 29 (the outer diameter of the base portions 23a, 26a) is smaller than the inner diameter of the movable plate 30, and the outer diameter of the storage space 29 (the inner diameter of the cylindrical member 21) is greater than the outer diameter of the movable plate 30. Therefore, when the movable plate 30 is located in the center of the storage space 29 (not in contact with each wall surface of the storage space 29), a second orifice that communicates between the first liquid chamber 17 and the second liquid chamber 18 is formed by the gap between the movable plate 30 and each wall surface of the storage space 29, the first through hole 24, and the second through hole 27.

The flow cross-sectional area, length, cross-sectional circumference, etc. of this second orifice are set so that the damping coefficient is large in the frequency band corresponding to the idle vibration (e.g., about 15 to 50 Hz) when a small amplitude idle vibration is input, for example, to reduce the idle vibration during idling (when the vehicle is stopped).

When the movable plate 30 is displaced in the vertical direction by applying hydraulic pressure to the movable plate 30 through the first through hole 24 and the second through hole 27, the second orifice may be blocked. Specifically, the second orifice is blocked when the annular protrusions 31 and 32 are pressed against the inner annular portion 23c and the outer annular portion 23d of the first partition plate 23, respectively, over the entire circumference. Also, the second orifice is blocked when the annular protrusions 33 and 34 are pressed against the inner annular portion 26c and the outer annular portion 26d of the second partition plate 26, respectively, over the entire circumference. Note that when the second orifice is blocked, the damping characteristics of the first orifice 19 are mainly exerted.

Even in this blocked state, the movable plate 30 between the annular protrusions 31, 32 and between the annular protrusions 33, 34 is deformed (displaced) in the vertical direction by the application of liquid pressure via the first through-hole 24 and the second through-hole 27. The deformation of the movable plate 30 is restricted by contacting the first protrusion 25 of the first lattice 23b and the second protrusion 28 of the second lattice 26b.

Compared to providing annular protrusions on the movable plate 30 to restrict deformation, providing the first protrusions 25 on the first lattice 23b and the second protrusions 28 on the second lattice 26b makes the movable plate 30 lighter. As a result, the energy of the impact sound generated by contact between the first partition plate 23 and the second partition plate 26 and the movable plate 30 can both be reduced. Therefore, abnormal noise caused by the impact sound can be suppressed.

The height H1 of the first protrusion 25 and the second protrusion 28 is lower than the height H2 of the annular protrusions 31 to 34. Therefore, even when the annular protrusions 31, 32 are in contact with the inner annular portion 23c and the outer annular portion 23d, the movable plate 30 can be deflected toward the first protrusion 25, and the damping performance due to this deflection can be ensured. Similarly, even when the annular protrusions 33, 34 are in contact with the inner annular portion 26c and the outer annular portion 26d, the movable plate 30 can be deflected toward the second protrusion 28, and the damping performance due to this deflection can be ensured.

The movable plate 30 is not sandwiched between the first partition plate 23 and the second partition plate 26, but floats in the liquid in the storage space 29. Therefore, the movable plate 30 is freely rotatable in the circumferential direction relative to the first partition plate 23 and the second partition plate 26. The contact positions of the first protrusions 25 and the second protrusions 28 with respect to the movable plate 30 change in response to the rotation of the movable plate 30. Therefore, the distortion caused by contact with the first protrusions 25 and the second protrusions 28 can be prevented from concentrating on a portion of the movable plate 30 in the circumferential direction, thereby improving the durability of the movable plate 30.

Next, the second embodiment will be described with reference to FIG. 4. In the first embodiment, the first lattice 23b and the second lattice 26b face each other, and the height H1 of the first protrusions 25 and the second protrusions 28 are all the same. In contrast, in the second embodiment, the multiple first lattices 23b and the multiple second lattices 26b are shifted from each other in the circumferential direction, and the heights of the first protrusions 25, 25a, 25b and the second protrusions 28a, 28b are different from each other. Note that the same reference numerals are used for the same parts as in the first embodiment, and the following description will be omitted.

Figure 4 is a cross-sectional view of the partition body 40 of the liquid-sealed vibration-proof device in the second embodiment. This Figure 4 shows a cross section at the same position as Figure 3. The first partition plate 41 and the second partition plate 42 of the partition body 40 are configured substantially the same as the first partition plate 23 and the second partition plate 26 in the first embodiment, so only the differences between them will be described below.

A number of first protrusions 25, 25a, 25b each protrude downward from a number of first lattices 23b of the first partition plate 41. The height H3 of the first protrusion 25a is greater than the height H1 of the first protrusion 25, and the height H4 of the first protrusion 25b is smaller than the height H1 of the first protrusion 25.

As a result, when the movable plate 30 deforms or displaces toward the first partition plate 41, the first protrusions 25a, 25, 25b contact the movable plate 30 in that order, restricting the deformation or displacement. In this way, the number of first protrusions 25, 25a, 25b that contact the movable plate 30 gradually increases, making it possible to suppress abnormal noises when the first protrusions 25, 25a, 25b contact the movable plate 30, compared to the first embodiment in which all of the first protrusions 25 contact the movable plate 30 at approximately the same timing.

A plurality of second protrusions 28a, 28b protrude upward from the plurality of second lattices 26b of the second partition plate 42. Although not shown, the second protrusion 28 (see FIG. 3) protrudes upward from the second lattice 26b to the right of the second protrusion 28a in FIG. 4. The height H3 of the second protrusion 28a is greater than the height H1 of the second protrusion 28, and the height H4 of the second protrusion 28b is smaller than the height H1 of the second protrusion 28. As a result, when the movable plate 30 is deformed or displaced toward the second partition plate 42, the second protrusions 28a, 28, 28b contact the movable plate 30 in this order. As a result, similar to the first protrusions 25, 25a, 25b, abnormal noises when the second protrusions 28, 28a, 28b contact the movable plate 30 can be suppressed.

The first protrusions 25, 25a, 25b are periodically arranged in the circumferential direction (towards the right side of the paper in FIG. 4) in the order of heights H3, H1, H4. The same is true for the second protrusions 28, 28a, 28b. As a result, it is easier to control how the movable plate 30 deforms when it comes into contact with each of the first protrusions 25, 25a, 25b and the second protrusions 28, 28a, 28b, and it is easier to control the characteristics of the movable plate 30 at the time of contact.

The first lattice 23b of the first partition plate 41 and the second lattice 26b of the second partition plate 42 are offset from each other in the circumferential direction. This prevents distortion caused when the first protrusions 25, 25a, 25b protruding from the first lattice 23b and the second protrusions 28, 28a, 28b protruding from the second lattice 26b contact the movable plate 30 from concentrating on a portion of the movable plate 30 in the circumferential direction. As a result, the durability of the movable plate 30 can be improved.

Furthermore, the second lattice 26b is located at the midpoint between the adjacent first lattices 23b, and the first lattice 23b is located at the midpoint between the adjacent second lattices 26b. This makes it easier to disperse the distortion of the movable plate 30 in the circumferential direction when it comes into contact with the first protrusions 25, 25a, 25b and the second protrusions 28, 28a, 28b. As a result, the durability of the movable plate 30 can be further improved.

The alternating first protrusions 25, 25a, 25b and second protrusions 28, 28a, 28b are periodically arranged in the circumferential direction (towards the right side of the paper in FIG. 4) in the order of heights H4, H1, H3. That is, for example, the first protrusion 25 of height H1 is located between the second protrusion 28b of height H4 and the second protrusion 28a of height H3. This makes it easier to control the way in which the movable plate 30 deforms as it vibrates up and down between the first protrusions 25, 25a, 25b and the second protrusions 28, 28a, 28b and comes into contact with them, and makes it easier to control the characteristics of the movable plate 30 at the time of contact.

Next, a third embodiment will be described with reference to FIG. 5. In the first embodiment, all of the first protrusions 25 are arranged in the radial center of the first lattice 23b. In contrast, in the third embodiment, a case will be described in which multiple first protrusions 25, 51, 52 are arranged with a radial offset. Note that the same parts as in the first embodiment are given the same reference numerals and the following description will be omitted.

Figure 5 is a plan view of the partition body 50 of the liquid-sealed vibration isolation device in the third embodiment. A plurality of first projections 25, 51, 52 protrude from the plurality of first lattices 23b of the first partition plate 23 of the partition body 50 toward the movable plate 30 (see Figure 1). In Figure 5, these plurality of first projections 25, 51, 52 are shown by dashed lines.

The first protrusion 25 protrudes from the radial center of the first lattice 23b. The first protrusion 51 protrudes from the radial outside of the first lattice 23b. The first protrusion 52 protrudes from the radial inside of the first lattice 23b. As a result, depending on how the movable plate 30 deforms or displaces toward the first partition plate 23, the number of first protrusions 25, 51, 52 in contact with the movable plate 30 gradually increases, and the deformation or displacement may be restricted.

Specifically, in this embodiment, annular protrusions 31, 32 (see FIG. 1) are provided on the radial inner and outer sides of the movable plate 30, and when they contact the first partition plate 23, the movable plate 30 deforms between the annular protrusions 31, 32 toward the first protrusions 25, 51, 52. The amount of deformation increases the farther away from the annular protrusions 31, 32 the movable plate 30 is, so that after the movable plate 30 contacts the first protrusions 25, the movable plate 30 contacts the first protrusions 51, 52. This makes it possible to suppress abnormal noises when the first protrusions 25, 51, 52 contact the movable plate 30, compared to the first embodiment in which all of the first protrusions 25 contact the movable plate 30 at approximately the same timing.

The first protrusions 25, 51, and 52 are periodically arranged clockwise in the circumferential direction in the order of center, outer side, and inner side in the radial direction. This makes it easier to control how the movable plate 30 deforms when it comes into contact with the first protrusions 25, 51, and 52, and makes it easier to control the characteristics of the movable plate 30 at the time of contact.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment, and it can be easily imagined that various improvements and modifications are possible within the scope of the present invention. For example, the first member 11 may be disposed at a position offset radially from the axis C. The axis C of the second member 12 and the axis C of the movable plate 30 may also be offset. A cavitation valve may be provided at the position of the base portions 23a and 26a to move liquid from the second liquid chamber 18 to the first liquid chamber 17 when the first liquid chamber 17 becomes excessively negative pressure.

The position and length of the first orifice 19 may be changed as appropriate. A liquid chamber other than the first liquid chamber 17 and the second liquid chamber 18 may be formed in the partition body 20. The two liquid chambers may be connected by an orifice other than the first orifice 19.

Also, a cup-shaped cap metal fitting may be provided under the diaphragm 15 (the opposite side to the first liquid chamber 17 and the second liquid chamber 18), and an air chamber may be formed by the inner surface of the cap metal fitting and the diaphragm 15. This air chamber may be an air-sprung space that is sealed. A through hole may be provided in part of the cap metal fitting to open the air chamber to the atmosphere, and a damping effect may be added by the air passing through the through hole.

In the above embodiment, an engine mount is given as an example of an application of the liquid-sealed vibration isolation device 10, but the application can be arbitrary. Other application targets include, for example, a motor mount, a member mount, and a differential mount. In addition, the first member 11 may be attached to the vibration source side such as an engine and the second member 12 to the vibration receiver side such as a vehicle body, and the second member 12 may be attached to the vibration source side and the first member 11 to the vibration receiver side.

In the above embodiment, a case has been described in which the vibration-isolating base 13 constitutes a portion of the chamber wall of the first liquid chamber 17, and the diaphragm 15 constitutes a portion of the chamber wall of the second liquid chamber 18, but this is not necessarily limited to this. For example, the second liquid chamber 18 may be referred to as the first liquid chamber, and the first liquid chamber 17 may be referred to as the second liquid chamber. In this case, the names of the parts of the partition bodies 20, 40, and 50 in the above embodiment are basically reversed between "first" and "second."

Part of the above embodiment may be omitted. For example, the cylindrical portion 23e and the flange 23f of the first partition plate 23 may be omitted. The membrane portion 14 may be omitted, and the partition bodies 20, 40, 50 and the diaphragm 15 may be attached to the inner peripheral surface of the second member 12. At least one of the annular protrusions 31 to 34 may be omitted. Also, the base portions 23a and 26a may be omitted, and the movable plate 30 may be formed into a disk shape.

A part of each of the above embodiments may be combined with a part of another embodiment. For example, the protruding positions of the first protrusions 25, 25a, 25b having different heights H1, H3, H4 in the second embodiment may be shifted in the radial direction as in the third embodiment. Also, the protruding positions of the multiple second protrusions 28, 28a, 28b in the first and second embodiments may be shifted in the radial direction as in the first protrusions 25, 51, 52 in the third embodiment.

When the heights of the multiple first protrusions and second protrusions are made different, the heights may be two or four or more than three different heights, rather than just three different heights H1, H3, and H4. Furthermore, the multiple first protrusions and second protrusions are not limited to being arranged in the circumferential direction in height order, and may be arranged irregularly.

In addition, when the multiple first protrusions and second protrusions are shifted in the radial direction, the positions may be two or four or more positions, rather than just three positions on the radial outside, center, and inside. When the multiple first protrusions and second protrusions are positioned in one position, they do not have to be limited to the radial center. Furthermore, the multiple first protrusions and second protrusions are not limited to being arranged in the circumferential direction in the order of radial center, outside, and inside, and may be arranged irregularly.

In the above embodiment, the first through holes 24 and the second through holes 27 are arranged in only one row in the circumferential direction, but they may be arranged in two or more rows in the radial direction. In this case, the number, dimensions, and shapes of the first through holes 24 and the second through holes 27 on the inside in the radial direction and the first through holes 24 and the second through holes 27 on the outside in the radial direction may be different.

In the above embodiment, the first protrusions 25, 25a, 25b, 51, 52 are provided for each first lattice 23b, and the second protrusions 28, 28a, 28b are provided for each second lattice 26b, but this is not limited to the above. For example, two or more first protrusions 25, 25a, 25b, 51, 52 may be provided for one first lattice 23b, and two or more second protrusions 28, 28a, 28b may be provided for one second lattice 26b. In addition, the first protrusions 25, 25a, 25b, 51, 52 and the second protrusions 28, 28a, 28b may not be provided partially among the multiple first lattices 23b and second lattices 26b.

In the above embodiment, the movable plate 30 is floating in the liquid in the storage space 29, but this is not limited to the above. For example, the movable plate 30 may be sandwiched between the first partition plate 23 and the second partition plate 26. In addition, the movable plate 30 may divide the storage space 29 into upper and lower sections, so that liquid cannot move between the first liquid chamber 17 and the second liquid chamber 18 through the storage space 29.

In the above embodiment, the annular protrusions 31 to 34 are described as being continuous in the circumferential direction, but this is not limited to the above. For example, a slit may be provided in a portion of the annular protrusions 31 to 34 in the circumferential direction. In addition, some of the multiple annular protrusions 31 to 34 may have different heights. The multiple annular protrusions 31 to 34 are not limited to being arranged on concentric circles, and their centers may be offset from each other.

REFERENCE SIGNS LIST 10 Liquid-filled vibration-isolating device 11 First member 12 Second member 13 Vibration-isolating base 15 Diaphragm 17 First liquid chamber 18 Second liquid chamber 19 First orifice (orifice)
20, 40, 50 Partition body 23, 41 First partition plate 23b First grid 23c, 26c Inner annular portion (annular portion)
23d, 26d Outer annular portion (annular portion)
24 First through hole 25, 25a, 25b, 51, 52 First protrusion 26, 42 Second partition plate 26b Second lattice 27 Second through hole 28, 28a, 28b Second protrusion 30 Movable plate 31, 32, 33, 34 Annular protrusion

Claims (7)

A first member and a cylindrical second member;
a vibration-isolating base made of an elastic material that connects the first member and the second member;
a diaphragm made of an elastic material attached to the second member and forming a liquid chamber filled with liquid between the diaphragm and the vibration-isolating base;
a partition body that divides the liquid chamber into a first liquid chamber and a second liquid chamber;
an orifice communicating the first liquid chamber with the second liquid chamber;
the partition body includes a first partition plate having a plurality of first through holes penetrating in a plate thickness direction and arranged in a circumferential direction, and a plurality of first lattices formed between the plurality of first through holes, the first partition plate facing the first liquid chamber;
a second partition plate facing the second liquid chamber;
a movable plate made of an elastic material and arranged between the first partition plate and the second partition plate so as to face the first through holes and the first lattice,
A liquid-sealed vibration-isolating device, characterized in that a plurality of first protrusions protrude from a plurality of the first gratings toward the movable plate. The second partition plate has a plurality of second through holes that penetrate a portion of the second partition plate facing the movable plate in a plate thickness direction and are arranged in a circumferential direction.
and a plurality of second gratings formed between the plurality of second through holes,
2. The liquid-filled vibration-isolating device according to claim 1, wherein a plurality of second projections protrude from a plurality of the second gratings toward the movable plate. The liquid-filled vibration-proof device according to claim 2, characterized in that the first lattices and the second lattices are arranged offset from each other in the circumferential direction. A liquid-filled anti-vibration device according to any one of claims 1 to 3, characterized in that the first protrusions have different heights. A liquid-filled anti-vibration device according to any one of claims 1 to 3, characterized in that some of the first protrusions protrude from the first lattice at positions that are radially offset. The first partition plate includes an annular portion extending radially outward and/or inward from the first lattice and continuing in a circumferential direction,
the movable plate includes an annular protrusion that protrudes so as to be able to come into contact with the annular portion,
4. The hydraulic anti-vibration device according to claim 1, wherein the first projection is lower than the annular projection. A liquid-filled anti-vibration device according to any one of claims 1 to 3, characterized in that the movable plate is formed in a disk or annular plate shape and floats in the liquid so as to be freely rotatable in the circumferential direction of the movable plate relative to the first partition plate and the second partition plate.

Images