Liquid-filled vibration isolation device

Abstract

To provide a liquid sealed type vibration control device which can inhibit abnormal noise occurring when a movable plate and gratings contact with each other.SOLUTION: A movable plate 40 is connected to a valve 30 by a connection part 36 penetrating through a first cylindrical wall 23a and a second cylindrical wall 26a. Thus, rotation in a circumferential direction and movement in a radial direction of the movable plate 40 can be restricted within an external space 29b. The structure makes a plurality of first protrusions 45 and second protrusions 46 protruding from the movable plate 40 and spaced apart from each other in the circumferential direction less likely to shift relative to the first gratings 23b and the second gratings 26b in conjunction with rotation and radial movement of the movable plate 40. Since it is not necessary to form the projections configured to contact with the first gratings 23b and the second gratings 26b in an annular form, the weight of the movable plate 40 can be reduced. Consequently, striking sound generation energy caused by contact between the first gratings 23b / the second gratings 26b and the movable plate 40 can be reduced and abnormal noise caused by the striking sound can be prevented.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a liquid-filled vibration isolator, and particularly to a liquid-filled vibration isolator capable of suppressing abnormal noise when a movable plate contacts a lattice.

Background Art

[0002] As a vibration isolator for supporting a vibration source such as an engine on a vehicle body (support side), for example, a liquid-filled vibration isolator disclosed in Patent Document 1 is known. The liquid-filled vibration isolator disclosed in Patent Document 1 has a liquid chamber formed inside, which is partitioned 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 disposed between the first partition plate and the second partition plate and composed of a disk-shaped elastic body.

[0003] A plurality of through holes penetrating in the plate thickness direction are formed side by side in the circumferential direction on the first partition plate and the second partition plate, and a lattice is formed between the plurality of through holes. The hydraulic pressures of the first liquid chamber and the second liquid chamber are applied to the movable plate through the through holes, and the vibration energy input to the liquid-filled vibration isolator is consumed by the deformation or displacement of the movable plate. Further, the deformation or displacement of the movable plate is restricted by applying a protrusion protruding from the movable plate against the lattice of the first partition plate or the second partition plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in Patent Document 1, since the disc-shaped movable plate may rotate circumferentially when assembling the movable plate to the first and second partition plates or during use, it is necessary to form a ring-shaped projection for contact with the grid. In this way, since projections are also provided on the part that does not contact the grid but faces the through hole, the weight of the movable plate increases. As a result, the energy required to generate a tapping sound due to contact between the movable plate and the grid increases, which may worsen the noise reduction performance.

[0006] The present invention was 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 and the grid come into contact. [Means for solving the problem]

[0007] To achieve this objective, the liquid-filled vibration isolation device of the present invention comprises a first member and a cylindrical second member, an elastic vibration isolation base connecting the first member and the second member, an elastic diaphragm attached to the second member and forming a liquid chamber between it and the vibration isolation base in which liquid is sealed, 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, wherein the partition body faces the first liquid chamber. The valve comprises a first partition plate, a second partition plate facing the second liquid chamber, a cylindrical wall radially dividing the space between the first and second partition plates into an inner space and an annular outer space, an elastic valve housed in the inner space and displaceable in the axial direction of the cylindrical wall, an annular movable plate made of elastic material housed in the outer space and displaceable in the axial direction, and a connecting portion connecting the valve and the movable plate and penetrating the cylindrical wall, wherein the valve is connected to the first partition plate and the Each partition plate has a cylindrical valve portion that protrudes toward the second partition plate and contacts the first partition plate and the second partition plate respectively when unloaded. The first partition plate has a first valve hole that penetrates axially beyond the cylindrical valve portion radially outward and radially inward beyond the cylindrical wall, a plurality of first through holes that penetrate axially beyond the cylindrical wall radially outward and are arranged in the circumferential direction of the cylindrical wall, and a plurality of first grids formed between the plurality of first through holes. The second partition plate has a second valve hole that penetrates axially beyond the cylindrical valve portion radially inward, a plurality of second through holes that penetrate axially beyond the cylindrical wall radially outward and are arranged in the circumferential direction, and a plurality of second grids formed between the plurality of second through holes. The movable plate has a plurality of projections that protrude toward at least one of the plurality of first grids and the plurality of second grids and are spaced apart from each other in the circumferential direction. [Effects of the Invention]

[0008] According to the liquid-filled vibration isolation device described in claim 1, a valve, a first valve hole, and a second valve hole are provided in the inner space between the first partition plate and the second partition plate, which is partitioned by a cylindrical wall, and function as a so-called cavitation valve. Specifically, when the first liquid chamber becomes excessively negatively pressurized relative to the second liquid chamber due to deformation of the vibration isolation base, the valve is displaced toward the first liquid chamber, and the cylindrical valve portion of the valve separates from the second partition plate. As a result, liquid flows from the second liquid chamber into the first liquid chamber through the second valve hole, the inner space, and the first valve hole, relieving the excessive negative pressure in the first liquid chamber and suppressing cavitation associated with that negative pressure.

[0009] On the other hand, an annular movable plate is housed in the annular outer space partitioned by the cylindrical wall. This movable plate is connected to a valve at a connecting portion that penetrates the cylindrical wall. As a result, the circumferential rotation and radial movement of the movable plate are restricted within the outer space. This makes it difficult for multiple protrusions, which project from the movable plate toward at least one of the multiple first grids and multiple second grids (hereinafter referred to as "multiple target grids") and are spaced apart from each other in the circumferential direction, to shift relative to the multiple target grids as the movable plate rotates or moves radially. Therefore, when the movable plate deforms or displaces toward the multiple target grids, the deformation or displacement of the movable plate can be restricted by having the multiple protrusions come into contact with the multiple target grids, even if the protrusions projecting from the movable plate are not annular. Thus, by making the protrusions provided on the movable plate for this restriction multiple and spaced apart in the circumferential direction compared to a case where the protrusions are a continuous annular shape in the circumferential direction, the movable plate can be made lighter. As a result, the energy generated by the impact sound caused by the contact between the multiple target grids and the movable plate can be reduced, and the abnormal noise resulting from that impact sound can be suppressed.

[0010] The liquid-filled vibration isolation device described in claim 2 provides the following effects in addition to those of the liquid-filled vibration isolation device described in claim 1: The plurality of protrusions comprises a plurality of first protrusions projecting toward a plurality of first grids and a plurality of second protrusions projecting toward a plurality of second grids. That is, the plurality of target grids are both a plurality of first grids and a plurality of second grids. Therefore, the energy generated by the impact sound caused by the contact between each of the plurality of first grids and the plurality of second grids and the movable plate can be reduced, and abnormal noises based on that impact sound can be suppressed.

[0011] The liquid-filled vibration isolation device according to claim 3 provides the following effects in addition to the effects of the liquid-filled vibration isolation device according to claim 1 or 2. The cylindrical wall is formed by joining the ends of a first cylindrical wall that protrudes axially from a first partition plate and a second cylindrical wall that protrudes axially from a second partition plate. A groove is formed radially through at least one end of the first cylindrical wall and the second cylindrical wall. The connecting portion fitted into the groove is sandwiched between the first cylindrical wall and the second cylindrical wall and compressed axially. This makes it difficult for the valve and movable plate connected to the connecting portion to shift radially relative to the first partition plate and the second partition plate. Therefore, it is possible to suppress the shifting of multiple target grids and multiple protrusions.

[0012] The liquid-filled vibration isolation device according to claim 4 provides the following effects in addition to those of the liquid-filled vibration isolation device according to claim 3: Since the circumferential width of the groove is smaller than the circumferential free length of the connecting portion, the connecting portion can be easily inserted into the groove. Furthermore, the connecting portion, which is compressed axially between the first cylindrical wall and the second cylindrical wall, adheres tightly to the walls on both sides of the groove in the circumferential direction. This makes it difficult for liquid to leak between the inner space and the outer space through the gap between the groove and the connecting portion.

[0013] The liquid-filled vibration isolation device according to claim 5 provides the following effects in addition to the effects of the liquid-filled vibration isolation device according to claim 1 or 2. Multiple connecting parts are provided, extending from the valve in two or more directions that intersect each other radially. This makes it difficult for the valve and movable plate connected to the connecting parts to shift radially with respect to the first partition plate and the second partition plate. Thus, misalignment between multiple target grids and multiple protrusions can be suppressed.

[0014] The liquid-filled vibration isolation device according to claim 6 provides the following effects in addition to the effects of the liquid-filled vibration isolation device according to claim 1 or 2: The connecting portion that penetrates the cylindrical wall has a smaller axial dimension than its circumferential dimension. This makes it less likely for the connecting portion to obstruct the axial deformation or displacement of the movable plate.

[0015] The liquid-filled vibration isolation device described in claim 7 provides the following effects in addition to those of the liquid-filled vibration isolation device described in claim 1 or 2. A block is formed between the valve and the cylindrical wall in the connecting portion, with larger dimensions in the axial and circumferential directions relative to the portion that penetrates the cylindrical wall. This block makes it difficult for the valve and the movable plate to shift radially relative to the first and second partition plates. Therefore, displacement between multiple target grids and multiple protrusions can be suppressed. [Brief explanation of the drawing]

[0016] [Figure 1] This is a cross-sectional view of a liquid-filled vibration damping device according to the first embodiment. [Figure 2] This is a plan view of the partition. [Figure 3] This is a plan view of the partition with the first partition plate removed. [Figure 4] This is a cross-sectional view of the partition along line IV-IV in Figure 2. [Figure 5] This is a cross-sectional view of the partition along the VV line in Figure 2. [Figure 6] This is a cross-sectional view of the partition in the second embodiment. [Figure 7] This is a plan view of the partition body with the first partition plate removed in the third embodiment.

Best Mode for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the liquid-filled vibration isolator 10 in the first embodiment. Note that FIG. 1 shows a no-load state in which no vibration (load) is input to the liquid-filled vibration isolator 10. Unless otherwise specified, each part of the liquid-filled vibration isolator 10 will be described in the no-load state. Also, in the following description, the upper side on the paper surface of FIG. 1 will be described as the upper side of the liquid-filled vibration isolator 10, etc., but the up and down of this liquid-filled vibration isolator 10 does not necessarily coincide with the up and down of the vehicle to which the liquid-filled vibration isolator 10 is attached.

[0018] The liquid-filled vibration isolator 10 is an engine mount that elastically supports the engine of an automobile. The liquid-filled vibration isolator 10 mainly includes a first member 11 attached to the engine side, which is the vibration source, a cylindrical second member 12 attached to the vehicle body on the support side, and a vibration isolation 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-filled vibration isolator 10 in FIG. 1 is an axial cross-sectional view including the axial center C of the cylindrical second member 12. The axial direction of the axial center C (axial direction) is the vertical direction of the liquid-filled vibration isolator 10.

[0019] The first member 11 is a boss fitting arranged on the axial center C so as to be located above the second member 12, and is formed of a metal such as steel or an aluminum alloy. Bolt holes are formed on the upper end surface of the first member 11. The first member 11 is attached to the engine side via bolts attached to the bolt holes.

[0020] The second member 12 is a cylindrical member centered on the axial center C, and is mainly formed of a metal such as steel. The second member 12 includes a large-diameter portion 12a on the upper end side, a reduced-diameter portion 12b that is continuous with the lower end of the large-diameter portion 12a and whose inner and outer diameters gradually decrease downward, and a small-diameter portion 12c that is continuous with the lower end of the reduced-diameter portion 12b and has inner and outer diameters smaller than those of the large-diameter portion 12a. For example, the second member 12 is attached to the vehicle body side by being inserted into a cylindrical bracket provided on the vehicle body side.

[0021] The vibration damping base 13 is a member made of an elastic body such as rubber or thermoplastic elastomer formed in a substantially umbrella shape. The vibration damping base 13 is vulcanization-bonded to the lower part of the first member 11 and the inner peripheral surfaces of the large-diameter part 12a and the reduced-diameter part 12b, respectively, and connects them. A rubber film-like film part 14 that covers the inner peripheral surface of the small-diameter part 12c is continuous with the lower end part of the vibration damping base 13. This film part 14 is a part of the second member 12.

[0022] A diaphragm 15 is attached to the second member 12 via an attachment part 16 so as to close the lower end opening of the small-diameter part 12c. The diaphragm 15 is a film made of an elastic body such as rubber. The attachment part 16 is an annular member made of metal such as steel. The outer peripheral part of the diaphragm 15 is vulcanization-bonded to the entire circumference of the inner peripheral part of the attachment part 16.

[0023] A liquid chamber is formed by a sealed space partitioned by the vibration damping base 13, the second member 12, and the diaphragm 15. An antifreezing liquid (not shown) such as ethylene glycol is enclosed in the liquid chamber. The liquid chamber is partitioned by a partition body 20 into a first liquid chamber 17 in which the vibration damping base 13 constitutes a part of the chamber wall and a second liquid chamber 18 in which the diaphragm 15 constitutes a part of the chamber wall.

[0024] [[ID=ID=14]]To attach the diaphragm 15 and the partition body 20 to the second member 12, first, the partition body 20 is inserted into the small-diameter part 12c of the second member 12 until it hits a step 13a of the vibration damping base 13 that projects stepwise inward in the radial direction from the upper end of the film part 14. Next, after the attachment part 16 integrated with the diaphragm 15 is inserted into the small-diameter part 12c, the small-diameter part 12c (second member 12) is reduced in diameter by drawing, and the outer peripheral parts of the partition body 20 and the attachment part 16 are held by the film part 14. Thereby, the diaphragm 15 and the partition body 20 are attached to the second member 12.

[0025] The partition 20 will be explained with reference to Figures 1, 2 through 5. Figure 2 is a plan view of the partition 20. A cross-section of the partition 20 along line II in Figure 2 is shown in Figure 1. Figure 3 is a plan view of the partition 20 with the first partition plate 23 removed. Figure 4 is a cross-sectional view of the partition 20 along line IV-IV in Figure 2. Figure 5 is a cross-sectional view of the partition 20 along line VV in Figure 2.

[0026] As shown in Figures 1 and 2, the partition body 20 comprises a cylindrical member 21 held inside the membrane portion 14, flat first partition plate 23 and second partition plate 26 that partition the inner circumference of the cylindrical member 21 vertically, and a valve 30 and a movable plate 40 positioned 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 joined by overlapping each other vertically and welding, bonding, or press-fitting.

[0027] The cylindrical member 21 is a cylindrical part made of metal or synthetic resin. The outer surface of the cylindrical member 21 is pressed against the small diameter portion 12c of the second member 12 via the membrane portion 14 along its entire circumference. An outer groove 22 with a length of approximately two turns is formed on the outer surface of the cylindrical member 21. The first orifice 19 is formed between this outer groove 22 and the membrane portion 14.

[0028] One end of the outer circumferential groove 22 opens to the inner circumferential surface of the cylindrical member 21 above the first partition plate 23 or to the upper end of the cylindrical member 21, thereby connecting the first orifice 19 to the first liquid chamber 17. The other end of the outer circumferential groove 22 opens to the inner circumferential surface of the cylindrical member 21 below the second partition plate 26 or to the lower end of the cylindrical member 21, thereby connecting the first orifice 19 to the second liquid chamber 18.

[0029] Thus, the first orifice 19 is a flow path that connects the first liquid chamber 17 and the second liquid chamber 18. The first orifice 19 is configured such that, for example, to dampen shaking vibrations during vehicle operation, the damping coefficient becomes large in the frequency band corresponding to the shaking vibrations (for example, around 5 to 15 Hz) when large-amplitude shaking vibrations are input. The flow path cross-sectional area, length, and cross-sectional circumference of the first orifice 19 are set accordingly.

[0030] The first partition plate 23 is made of metal or synthetic resin and is formed in a disc shape perpendicular to the axis C. From the lower surface of the first partition plate 23, a cylindrical first cylindrical wall 23a, centered on the axis C, protrudes downward (towards the second partition plate 26). In this embodiment, the circumferential and radial directions of the first cylindrical wall 23a are simply described as the circumferential and radial directions.

[0031] The first partition plate 23 has multiple holes formed through it in the thickness direction (vertical direction). These multiple holes include one central hole 24a located radially inward from the first cylindrical wall 23a and on the axis C, multiple first valve holes 24b located radially inward from the first cylindrical wall 23a and around the central hole 24a, and multiple first through holes 24c located radially outward from the first cylindrical wall 23a.

[0032] Multiple first valve holes 24b and multiple first through holes 24c are arranged in a circumferential direction. Multiple first grids 23b are formed in the first partition plate 23 between the multiple first through holes 24c. The first grids 23b extend radially around the axis C with a substantially constant width (circumferential dimension).

[0033] The first partition plate 23 comprises an inner annular portion 23c that extends radially inward from the first grid 23b and is continuous in the circumferential direction, and an outer annular portion 23d that extends radially outward from the first grid 23b and is continuous in the circumferential direction. The inner annular portion 23c is the part that connects the first grid 23b and the first cylindrical wall 23a in the radial direction. The outer annular portion 23d extends to the inner circumferential surface of the cylindrical member 21.

[0034] A cylindrical portion 23e extends upward from the outer annular portion 23d, and a flange 23f extends radially outward from the upper end edge of the cylindrical portion 23e. The first partition plate 23 is attached to the cylindrical member 21 by fitting the cylindrical portion 23e to the inner circumference of the cylindrical member 21 until the flange 23f contacts the upper end of the cylindrical member 21. The flange 23f that has contacted the upper end of the cylindrical member 21 contacts the step 13a of the vibration-damping base 13. In addition, a portion of the cylindrical portion 23e and the flange 23f is omitted in the circumferential direction so as not to block the opening of the outer peripheral groove 22 on the first liquid chamber 17 side.

[0035] The second partition plate 26 is integrally molded with the cylindrical member 21 and is formed in a disc shape perpendicular to the axis C. The outer edge of the second partition plate 26 is connected to the inner surface of the cylindrical member 21 along its entire circumference, and a storage space is formed between the first partition plate 23 attached to the cylindrical member 21 and the second partition plate 26.

[0036] From the lower surface of the second partition plate 26, opposite the first cylindrical wall 23a, a cylindrical second cylindrical wall 26a with axis C protrudes upward (towards the first partition plate 23). This second cylindrical wall 26a has the same inner and outer diameter as the first cylindrical wall 23a. The ends of the first cylindrical wall 23a and the second cylindrical wall 26a are joined together by welding or the like, forming a cylindrical wall that radially partitions the above-mentioned storage space.

[0037] A cylindrical inner space 29a is formed radially inside the first cylindrical wall 23a and the second cylindrical wall 26a (cylindrical wall). On the other hand, an annular outer space 29b is formed radially outside the first cylindrical wall 23a and the second cylindrical wall 26a.

[0038] The second partition plate 26 has multiple holes formed through it in the thickness direction (vertical direction). These multiple holes include one second valve hole 27a located radially inside the second cylindrical wall 26a and on the axis C, and multiple second through holes 27b located radially outside the second cylindrical wall 26a.

[0039] Multiple second through holes 27b are arranged in a circumferential direction. Multiple second grids 26b are formed in the second partition plate 26 between the multiple second through holes 27b. The second grids 26b extend radially around the axis C with a substantially constant width (circumferential dimension).

[0040] As shown in Figures 1 and 5, the shape, position, and dimensions of the second through-hole 27b and the second grid 26b are set symmetrically (mirror-like) to the first through-hole 24c and the first grid 23b of the first partition plate 23, respectively.

[0041] The second partition plate 26 comprises an inner annular portion 26c that extends radially inward from the second grid 26b and is continuous in the circumferential direction, and an outer annular portion 26d that extends radially outward from the second grid 26b and is continuous in the circumferential direction. The inner annular portion 26c is the part that connects the second grid 26b and the second cylindrical wall 26a in the radial direction. The outer annular portion 26d extends to the inner circumferential surface of the cylindrical member 21.

[0042] As shown in Figures 1 and 3, the valve 30 is a component made of an elastic material such as rubber or thermoplastic elastomer, and is formed in a disc shape with an axis C. The valve 30 is housed in the inner space 29a between the first partition plate 23 and the second partition plate 26, and is separated from the first cylindrical wall 23a and the second cylindrical wall 26a around its entire circumference.

[0043] The valve 30 includes a cylindrical valve portion 31 that protrudes upward from the upper surface toward the first partition plate 23, a cylindrical valve portion 32 that protrudes downward from the lower surface toward the second partition plate 26, and a plurality of ribs 33 that reinforce the cylindrical valve portions 31 and 32.

[0044] The cylindrical valve sections 31 and 32 are formed in a cylindrical shape centered on the axis C. The outer surfaces of the cylindrical valve sections 31 and 32 are tapered, becoming smaller in diameter towards the tip. The cylindrical valve sections 31 and 32 are arranged symmetrically vertically.

[0045] In the unloaded state of the liquid-filled vibration isolation device 10, the cylindrical valve portion 31 contacts the entire circumference of the first partition plate 23, radially outside the central hole 24a and radially inside the multiple first valve holes 24b. Also in the unloaded state, the cylindrical valve portion 32 contacts the entire circumference of the second partition plate 26, radially outside the second valve hole 27a. In this way, in the unloaded state, the valve 30 blocks the movement of liquid between the first liquid chamber 17 and the second liquid chamber 18 through the inner space 29a.

[0046] On the other hand, if a large load (large amplitude vibration) is input to the liquid-filled vibration isolation device 10, and the first liquid chamber 17 becomes excessively negatively pressurized due to the deformation of the vibration isolation base 13, the valve 30 will be displaced toward the first partition plate 23, and the cylindrical valve portion 31 will collapse. As a result, the space between the cylindrical valve portion 32 and the second partition plate 26 will be separated. Consequently, liquid will flow from the second liquid chamber 18 into the first liquid chamber 17 through the second valve hole 27a, the inner space 29a, and the first valve hole 24b. Therefore, the excessive negative pressure in the first liquid chamber 17 can be relieved, and cavitation associated with that negative pressure can be suppressed. A part that functions in this way is called a cavitation valve.

[0047] Furthermore, when the first liquid chamber 17 is under positive pressure, the force pressing the cylindrical valve portion 32 against the second partition plate 26 only increases, so, as in the unloaded state, the valve 30 blocks the movement of liquid through the inner space 29a. In addition, since the liquid pressure from the first liquid chamber 17 is applied to the center of the valve 30 through the central hole 24a, it is possible to make it difficult for liquid to leak through the gap between the cylindrical valve portion 32 and the second partition plate 26.

[0048] The ribs 33 protrude from both the upper and lower surfaces of the valve 30 on the radially inner side of the cylindrical valve sections 31 and 32. Furthermore, the ribs 33 extend radially from the axis C and connect to the inner circumferential surface of the cylindrical valve sections 31 and 32. These ribs 33 make it difficult for the cylindrical valve sections 31 and 32 to tilt radially. As a result, leakage of liquid through the gap between the cylindrical valve section 32 and the second partition plate 26 due to tilting of the cylindrical valve sections 31 and 32 can be suppressed.

[0049] Two connecting portions 36 extend radially outward from the valve 30. The two connecting portions 36 are arranged symmetrically with respect to the axis C. The connecting portions 36 penetrate the cylindrical walls (first cylindrical wall 23a and second cylindrical wall 26a) and are connected to the movable plate 40.

[0050] As shown in Figures 3 and 4, a groove 26e is formed radially through the tip of the second cylindrical wall 26a, and the connecting portion 36 is fitted into this groove 26e. In Figure 4, the free length state of the connecting portion 36 (a state in which no load is applied) is illustrated by a dashed line.

[0051] The vertical depth of the groove 26e is smaller than the vertical free length of the connecting portion 36. Therefore, the connecting portion 36 fitted into the groove 26e is compressed vertically between the first cylindrical wall 23a and the second cylindrical wall 26a. This makes it difficult for the valve 30 to shift radially relative to the first partition plate 23 and the second partition plate 26. As a result, the generation of abnormal noise due to friction between the wall surface of the groove 26e and the connecting portion 36 can be suppressed.

[0052] If the valve 30 is misaligned relative to the first partition plate 23 and the second partition plate 26, the valve 30 may block the first valve hole 24b and the second valve hole 27a, potentially reducing the cavitation suppression effect of the valve 30. In addition, the second valve hole 27a may be located radially outward of the cylindrical valve portion 32, causing liquid to constantly move between the first liquid chamber 17 and the second liquid chamber 18 via the inner space 29a, potentially preventing the valve 30 from functioning as a cavitation valve. Therefore, by making it difficult for the valve 30 to shift radially relative to the first partition plate 23 and the second partition plate 26, the function of the valve 30 as a cavitation valve can be easily achieved, and the reduction in the cavitation suppression effect can be prevented.

[0053] Furthermore, since the width of the groove 26e in the circumferential direction (left-right direction in Figure 4) is greater than the free length of the connecting portion 36 in the circumferential direction, the connecting portion 36 can be easily inserted into the groove 26e. After insertion, when the tip of the first cylindrical wall 23a is pressed against the tip of the second cylindrical wall 26a, and the connecting portion 36 is compressed vertically between the first cylindrical wall 23a and the second cylindrical wall 26a, the connecting portion 36 adheres tightly to the walls on both sides of the groove 26e in the circumferential direction. This makes it difficult for liquid to leak between the inner space 29a and the outer space 29b through the gap between the groove 26e and the connecting portion 36.

[0054] Furthermore, in the cross-section along the circumferential direction shown in Figure 4, it is preferable that the cross-sectional area of ​​the space formed between the first partition plate 23 and the second partition plate 26 by the groove 26e is less than or equal to the cross-sectional area of ​​the connecting portion 36 in its free length. In this case, when the connecting portion 36 is fitted into the groove 26e, substantially the entire inside of the groove 26e is filled with the connecting portion 36. As a result, it is possible to make it more difficult for liquid to leak between the inner space 29a and the outer space 29b through the gap between the groove 26e and the connecting portion 36.

[0055] As shown in Figure 3, a block 34 is formed between the valve 30 and the second cylindrical wall 26a in the connecting portion 36, with dimensions that are larger in the vertical and circumferential directions than the portion that fits into the groove 26e. This block 34 makes it difficult for the valve 30 to shift radially relative to the first partition plate 23 and the second partition plate 26. As a result, the function of the cavitation valve by the valve 30 can be easily exerted, and the reduction in the cavitation suppression effect can be suppressed.

[0056] Furthermore, when liquid attempts to pass through the gap between the groove 26e and the connecting portion 36, the flow resistance can be increased by the block 34. This makes it even more difficult for liquid to leak between the inner space 29a and the outer space 29b through that gap.

[0057] As shown in Figures 1 and 3, the movable plate 40 is a component made of an elastic material such as rubber or thermoplastic elastomer, and is formed in the shape of an annular plate with an axis C. A connecting part 36 is connected to the inner periphery of the movable plate 40. The movable plate 40, the connecting part 36, and the valve 30 are integrally molded by a mold. Therefore, compared to the case where these are molded separately and then integrated, the productivity of the movable plate 40, the connecting part 36, and the valve 30 can be improved.

[0058] The movable plate 40 surrounds the first cylindrical wall 23a and the second cylindrical wall 26a and is positioned in the outer space 29b between the first partition plate 23 and the second partition plate 26. The hydraulic pressure from the first liquid chamber 17 and the second liquid chamber 18 is applied to the movable plate 40 in the outer space 29b through the first through-holes 24c and the second through-holes 27b formed in the first partition plate 23 and the second partition plate 26, respectively. As the movable plate 40 deforms or displaces due to this hydraulic pressure, the vibration energy input to the liquid-filled vibration isolation device 10 is consumed, and the vibration can be damped by the liquid-filled vibration isolation device 10.

[0059] The movable plate 40 includes an annular projection 41 projecting toward the inner annular portion 23c, an annular projection 42 projecting toward the outer annular portion 23d, an annular projection 43 projecting toward the inner annular portion 26c, an annular projection 44 projecting toward the outer annular portion 26d, a plurality of first projections 45 projecting toward a plurality of first grids 23b, and a plurality of second projections 46 projecting toward a plurality of second grids 26b.

[0060] The annular projections 41-44 are all continuous annular portions extending around the entire circumference, and two of each are arranged on concentric circles centered on axis C. Furthermore, annular projections 41 and 43 are arranged alternately on both the upper and lower surfaces. Similarly, annular projections 42 and 44 are arranged alternately on both the upper and lower surfaces. This reduces the difference in rigidity between the thick and thin parts of the movable plate 40 compared to when each projection is arranged in the same position on both the upper and lower surfaces. As a result, it is possible to suppress the likelihood of cracks starting from the thin parts of the movable plate 40, thereby improving the durability of the movable plate 40.

[0061] Furthermore, the heights H2 of the annular protrusions 41 to 44 are all the same, and the vertical dimension of the outer space 29b is greater than the overall thickness of the movable plate 40 (the vertical distance between the tips of the annular protrusions 41 to 44 on both the upper and lower sides). Moreover, the inner diameter of the outer space 29b (the outer diameters of the first cylindrical wall 23a and the second cylindrical wall 26a) is smaller than the inner diameter of the movable plate 40, and the outer diameter of the outer space 29b (the inner diameter of the cylindrical member 21) is larger than the outer diameter of the movable plate 40. Therefore, when the movable plate 40 is located in the center of the outer space 29b (not in contact with any of the walls of the outer space 29b), a second orifice is formed connecting the first liquid chamber 17 and the second liquid chamber 18 by the gap between each wall of the outer space 29b and the movable plate 40, the first through hole 24c and the second through hole 27b.

[0062] This second orifice is designed to reduce idle vibrations, for example, during idling (when the vehicle is stopped). The flow path cross-sectional area, length, and perimeter of the second orifice are set so that the damping coefficient increases in the frequency band corresponding to the idle vibration (for example, around 15-50 Hz) when small amplitude idle vibrations are input.

[0063] When the movable plate 40 is displaced vertically due to the application of hydraulic pressure to the movable plate 40 through the first through-hole 24c and the second through-hole 27b, the second orifice may be blocked. Specifically, the second orifice is blocked when the annular projections 41 and 42 are pressed against the inner annular portion 23c and the outer annular portion 23d of the first partition plate 23, respectively, over their entire circumference. Also, the second orifice is blocked when the annular projections 43 and 44 are pressed against the inner annular portion 26c and the outer annular portion 26d of the second partition plate 26, respectively, over their entire circumference.

[0064] When the second orifice is blocked, the damping characteristics of the first orifice 19 are primarily exerted. Even in this blocked state, the movable plates 40 between the annular protrusions 41 and 42 and between the annular protrusions 43 and 44 are deformed vertically by the application of hydraulic pressure through the first through-hole 24c and the second through-hole 27b.

[0065] The multiple first protrusions 45 and multiple second protrusions 46 are for restricting the deformation and displacement of the movable plate 40. The multiple first protrusions 45 project upward from the radial center of the upper surface of the movable plate 40. The multiple first protrusions 45 are spaced apart from each other in the circumferential direction, and their spacing is approximately the same as the spacing of the multiple first grids 23b.

[0066] Multiple second protrusions 46 project downward from the radial center of the lower surface of the movable plate 40. The multiple second protrusions 46 are spaced apart from each other in the circumferential direction, and their spacing is approximately the same as the spacing of the multiple second grids 26b.

[0067] As shown in Figures 1 and 5, the multiple first protrusions 45 and the multiple second protrusions 46 are each set to have symmetrical (mirror-like) shapes, positions, and dimensions (height H1, etc.). With the connecting portion 36 of the movable plate 40 fitted into the groove 26e of the second cylindrical wall 26a, the multiple first protrusions 45 and the multiple first grids 23b face each other, and the multiple second protrusions 46 and the multiple second grids 26b face each other.

[0068] Furthermore, similar to the valve 30, the fitting of the connecting portion 36 into the groove 26e restricts the rotation and radial movement of the movable plate 40 within the outer space 29b. This makes it difficult for the multiple opposing first protrusions 45 and multiple first grids 23b to shift, and similarly makes it difficult for the multiple second protrusions 46 and multiple second grids 26b to shift.

[0069] Therefore, when the movable plate 40 deforms or displaces toward the first partition plate 23, the deformation or displacement of the movable plate 40 can be restricted by bringing multiple first protrusions 45 into contact with multiple first grids 23b, even without forming an annular projection from the upper surface of the movable plate 40. Similarly, when the movable plate 40 deforms or displaces toward the second partition plate 26, the deformation or displacement of the movable plate 40 can be restricted by bringing multiple second protrusions 46 into contact with multiple second grids 26b, even without forming an annular projection from the lower surface of the movable plate 40.

[0070] Therefore, by making the protrusions on the movable plate 40 spaced apart in the circumferential direction, rather than being a continuous annular shape in the circumferential direction, the movable plate 40 can be made lighter. As a result, the energy generated by the impact sound caused by the contact between each of the multiple first grids 23b and second grids 26b and the movable plate 40 can be reduced, and the resulting noise can be suppressed.

[0071] Furthermore, the heights H1 of the first projection 45 and the second projection 46 are lower than the heights H2 of the annular projections 41-44. Therefore, even when the annular projections 41 and 42 are in contact with the inner annular portion 23c and the outer annular portion 23d, the movable plate 40 can be deflected toward the first grid 23b, and damping performance can be ensured by this deflection. Similarly, even when the annular projections 43 and 44 are in contact with the inner annular portion 26c and the outer annular portion 26d, the movable plate 40 can be deflected toward the second grid 26b, and damping performance can be ensured by this deflection.

[0072] Furthermore, similar to the case of the valve 30, the dimensional relationship between the connecting portion 36 and the groove 26e, as well as the block 34, make it difficult for the movable plate 40 to shift radially relative to the first partition plate 23 and the second partition plate 26. This suppresses the displacement of the multiple first grids 23b and the second grids 26b, and the multiple first protrusions 45 and the multiple second protrusions 46, respectively.

[0073] As shown in Figure 4, the connecting portion 36, which is fitted into the groove 26e to restrict the rotation of the movable plate 40, has a vertical dimension that is smaller than its circumferential dimension. This makes it difficult for the connecting portion 36 to obstruct the vertical deformation or displacement of the movable plate 40.

[0074] Furthermore, as shown in Figure 1, the movable plate 40 near the connecting portion 36 is not significantly deformed or displaced in the vertical direction by the annular projections 41-44, so the durability of the connecting portion 36 can be ensured even if the vertical dimensions of the connecting portion 36 are small.

[0075] Next, a second embodiment will be described with reference to Figure 6. In the first embodiment, the case was described in which the first grid 23b and the second grid 26b face each other and the heights H1 of the first projection 45 and the second projection 46 are all the same. In contrast, the second embodiment will describe in which multiple first grids 23b and multiple second grids 26b are offset from each other in the circumferential direction and the heights of the first projections 45, 51, 52 and the second projections 46, 53 are different from each other. Note that parts that are the same as in the first embodiment are denoted by the same reference numerals and their descriptions are omitted below.

[0076] Figure 6 is a cross-sectional view of the partition body 50 of the liquid-filled vibration isolation device in the second embodiment. Figure 6 shows a cross-section at the same position as in Figure 5. In the partition body 50, the multiple first grids 23b of the first partition plate 23 and the multiple second grids 26b of the second partition plate 26 are offset from each other in the circumferential direction.

[0077] Multiple first protrusions 45, 51, and 52 projecting from the upper surface of the movable plate 40 of the partition body 50 each face multiple first grids 23b. Multiple second protrusions 46 and 53 projecting from the lower surface of the movable plate 40 of the partition body 50 each face multiple second grids 26b. As a result, the multiple first protrusions 45, 51, and 52 and the multiple second protrusions 46 and 53 are offset from each other in the circumferential direction.

[0078] This prevents the distortion of the movable plate 40 from concentrating in a part of the circumferential direction when the first protrusions 45, 51, 52 come into contact with the first grid 23b, or when the second protrusions 46, 53 come into contact with the second grid 26b. As a result, the durability of the movable plate 40 can be improved.

[0079] Furthermore, the second grid 26b and second protrusions 46, 53 are positioned midway between adjacent first grids 23b and first protrusions 45, 51, 52, and the first grid 23b and first protrusions 45, 51, 52 are positioned midway between adjacent second grids 26b and second protrusions 46, 53. This makes it easier to distribute the distortion of the movable plate 40 more circumferentially when the first protrusions 45, 51, 52 come into contact with the first grid 23b, or when the second protrusions 46, 53 come into contact with the second grid 26b. As a result, the durability of the movable plate 40 can be further improved.

[0080] The multiple first protrusions 45, 51, and 52 have different heights. The height H3 of the first protrusion 51 is smaller than the height H1 of the first protrusion 45, and the height H4 of the first protrusion 52 is smaller than the height H3 of the first protrusion 51.

[0081] As a result, when the movable plate 40 deforms or displaces toward the first partition plate 23, the first protrusions 45, 51, and 52 come into contact with the first grid 23b of the first partition plate 23 in that order, restricting its deformation or displacement. In this way, the number of first protrusions 45, 51, and 52 that come into contact with the first partition plate 23 gradually increases, which suppresses the noise generated when the first protrusions 45, 51, and 52 come into contact with the movable plate 40, compared to the case where all of the first protrusions 45 come into contact with the first partition plate 23 at approximately the same time, as in the first embodiment.

[0082] The first protrusions 45, 51, and 52 are arranged periodically in the circumferential direction (towards the right side of the paper in Figure 4) in the order of heights H1, H3, and H4. As a result, it is possible to easily control how the movable plate 40 deforms when the first protrusions 45, 51, and 52 come into contact with the first partition plate 23, and to easily control the characteristics of the movable plate 40 at the time of contact.

[0083] The multiple second protrusions 46 and 53 also differ in height from one another. The height H4 of the second protrusion 53 is smaller than the height H1 of the second protrusion 46. As a result, when the movable plate 40 deforms or displaces toward the second partition plate 26, the second protrusions 46 and 53 come into contact with the second grid 26b of the second partition plate 26 in that order. Consequently, similar to the first protrusions 45, 51, and 52, abnormal noises when the second protrusions 46 and 53 come into contact with the movable plate 40 can be suppressed.

[0084] Although not shown in the diagram, a second projection of height H3 (hereinafter referred to as "second projection H3") may be made to the right of the second projection 46 in Figure 6. In this case, similar to the first projections 45, 51, and 52, the second projections 46, 53, and H3 may be arranged periodically in the circumferential direction (towards the right side of the paper in Figure 4) in the order of heights H1, H3, and H4. As a result, it becomes easier to control how the movable plate 40 deforms when the second projections 46, 53, and H3 come into contact with the second partition plate 26, and it becomes easier to control the characteristics of the movable plate 40 at the time of contact.

[0085] Furthermore, the alternating first protrusions 45, 51, 52 and the second protrusions 46, 53, H3 are periodically arranged in the circumferential direction (towards the right side of the paper in Figure 4) in the order of heights H1, H4, H3. That is, for example, the second protrusion 53, with a height of H4, is positioned between the first protrusion 45, with a height of H1, and the first protrusion 51, with a height of H3. This makes it easier to control how the movable plate 40 deforms when the first protrusions 45, 51, 52 and the second protrusions 46, 53, H3 of the vibrating movable plate 40 come into contact with the first partition plate 23 and the second partition plate 26, respectively. Thus, it is easier to control the characteristics of the movable plate 40 at the time of contact.

[0086] Next, a third embodiment will be described with reference to Figure 7. In the first embodiment, the case in which the valve 30 and the movable plate 40 are connected by two connecting parts 36 and all the first projections 45 are positioned at the radial center of the movable plate 40 was described. In contrast, in the third embodiment, the case in which the valve 30 and the movable plate 40 are connected by three connecting parts 36 and multiple first projections 45, 61, 62 are positioned offset in the radial direction will be described. Note that parts identical to those in the first embodiment are denoted by the same reference numerals and their descriptions will be omitted below.

[0087] Figure 7 is a plan view of the partition body 60 of the liquid-filled vibration isolation device in the third embodiment, showing the state with the first partition plate 23 (see Figure 1) removed. Multiple first protrusions 45, 61, and 62 protruding from the upper surface of the movable plate 40 of the partition body 60 face multiple first grids 23b (see Figure 1).

[0088] The first projection 45 protrudes from the radial center of the movable plate 40. The first projection 61 protrudes from the radial outside (towards the annular projection 42) of the movable plate 40. The first projection 62 protrudes from the radial inside (towards the annular projection 41) of the movable plate 40. As a result, depending on how the movable plate 40 deforms or displaces toward the first partition plate 23, the number of first projections 45, 61, and 62 that contact the first grid 23b of the first partition plate 23 gradually increases, and their deformation or displacement may be restricted.

[0089] Specifically, in this embodiment, annular protrusions 41 and 42 are provided on the radially inner and outer sides of the movable plate 40. When these protrusions come into contact with the first partition plate 23, the movable plate 40 deforms toward the first partition plate 23 between the annular protrusions 41 and 42. This deformation increases as it moves away from the annular protrusions 41 and 42. Furthermore, since the inner edge of the movable plate 40 is connected to the connecting portion 36, the vertical deformation or displacement of the movable plate 40 is greater on the outer edge side (towards the annular protrusion 42). As a result, the movable plate 40, which deforms or displaces toward the first partition plate 23, comes into contact with the first partition plate 23 in the order of the first protrusions 45, 61, and 62. This suppresses the noise generated when the first protrusions 45, 61, and 62 come into contact with the first partition plate 23, compared to the case where all of the first protrusions 45 come into contact with the first partition plate 23 at approximately the same time, as in the first embodiment.

[0090] The first projections 45, 61, and 62 are arranged periodically in a clockwise direction in the circumferential direction, in the order of the radial center, outer, and inner. This makes it easier to control how the movable plate 40 deforms when the first projections 45, 61, and 62 come into contact with the first partition plate 23, and thus makes it easier to control the characteristics of the movable plate 40 at the time of contact.

[0091] In the partition body 60, the valve 30 and the movable plate 40 are connected by three connecting parts 36. The three connecting parts 36 extend from the valve 30 in three different radial directions. Specifically, the three connecting parts 36 extend in three directions that intersect each other at 120 degrees apart around the axis C. This improves the air venting performance from the mold when the valve 30, connecting parts 36, and movable plate 40 are integrally molded in a mold.

[0092] Three grooves 26e are formed in the second cylindrical wall 26a at positions where these three connecting parts 36 are fitted. When the three connecting parts 36 are fitted into the three grooves 26e, the valve 30 and the movable plate 40 can be made even less likely to shift radially relative to the first partition plate 23 and the second partition plate 26. As a result, as described above, the reduction in the cavitation suppression effect of the valve 30 can be suppressed. In addition, the displacement between the multiple first protrusions 45, 61, 62 and the multiple second protrusions 46 and the multiple first grids 23b and the multiple second grids 26b can be suppressed.

[0093] Furthermore, on the inner edge of the movable plate 40, a total of three protrusions 65 extend radially inward from the midpoint between adjacent connecting portions 36. These protrusions 65 each fit into recesses 66 formed on the outer circumferential surface of the second cylindrical wall 26a. This makes it even more difficult for the valve 30 and the movable plate 40 to shift radially relative to the first partition plate 23 and the second partition plate 26.

[0094] Furthermore, even if the connecting portion 36 breaks, the protrusion 65 fits into the recess 66, making it difficult to rotate the movable plate 40 circumferentially relative to the first partition plate 23 and the second partition plate 26. As a result, displacement between the multiple first protrusions 45, 61, 62 and the multiple second protrusions 46 and the multiple first grids 23b and the multiple second grids 26b can be suppressed.

[0095] Although the present invention has been described above based on embodiments, it can be easily inferred that the present invention is not limited in any way to the above embodiments, and that various improvements and modifications are possible without departing from the spirit of the present invention. For example, the first member 11 may be positioned at a location offset radially from the axis C. Also, the axis C of the second member 12 may be offset from the axis C of the first cylindrical wall 23a, the second cylindrical wall 26a, the valve 30, and the movable plate 40.

[0096] Furthermore, the position and length of the first orifice 19 may be changed as appropriate. Another liquid chamber may be formed inside the partition 20, separate from the first liquid chamber 17 and the second liquid chamber 18. The two liquid chambers may be connected by an orifice separate from the first orifice 19.

[0097] Alternatively, a cup-shaped cap fitting may be provided at the lower part of the diaphragm 15 (on the opposite side from 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 fitting and the diaphragm 15. This air chamber may be made into a sealed space to provide an air spring effect. A through hole may be provided in a part of the cap fitting to open the air chamber to the atmosphere, and a damping effect may be added by the air passing through the through hole.

[0098] In the above embodiment, an engine mount was given as an example of an application target for the liquid-filled vibration damping device 10, but the application target is arbitrary. Other examples of application targets include motor mounts, member mounts, and differential mounts. Furthermore, it is not limited to attaching the first member 11 to the vibration source side such as the engine and attaching the second member 12 to the vibration receiving side such as the vehicle body; the second member 12 may be attached to the vibration source side and the first member 11 may be attached to the vibration receiving side.

[0099] Some of the above embodiments may be omitted. For example, the cylindrical portion 23e and flange 23f of the first partition plate 23 may be omitted. The membrane portion 14 may be omitted and the partitions 20, 50, 60 and the diaphragm 15 may be attached to the inner circumferential surface of the second member 12. At least one of the annular projections 41 to 44 may be omitted.

[0100] Parts of each of the above embodiments may be combined with parts of other embodiments. For example, the positions of the first protrusions 45, 51, and 52, which have different heights H1, H3, and H4 in the second embodiment, may be shifted radially, as in the third embodiment. Also, the positions of the multiple second protrusions 46 and 53 in the first and second embodiments may be shifted radially, as in the first protrusions 45, 61, and 62 in the third embodiment.

[0101] Furthermore, when the heights of multiple first and second protrusions are varied, it is not limited to three different heights H1, H3, and H4; two or four or more different heights may also be used. Moreover, it is not limited to arranging multiple first and second protrusions in circumferential order in height; they may also be arranged irregularly.

[0102] Furthermore, when offsetting multiple first and second protrusions radially, the positions may be not limited to three locations (outer, center, and inner) in the radial direction, but may also be two or four or more locations. When the position of multiple first and second protrusions is limited to one location, it does not have to be limited to the radial center. Moreover, the arrangement of multiple first and second protrusions circumferentially is not limited to the radial center, outer, and inner order, but may also be irregular.

[0103] In the above embodiment, the case where there is only one row of first through holes 24c and second through holes 27b arranged in the circumferential direction was described, but they may be arranged in two or more rows in the radial direction. In this case, the number, dimensions, and shape of the first through holes 24c and second through holes 27b on the radial inner side and the first through holes 24c and second through holes 27b on the radial outer side may be changed.

[0104] In the above embodiment, the case in which one first lattice 23b faces one first projection 45, 51, 52, 61, 62 was described, but it is not limited to this. For example, one first lattice 23b may face two or more first projections 45, 51, 52, 61, 62. Also, one second lattice 26b may face two or more second projections 46, 53. It is not necessary to partially face the first projections 45, 51, 52, 61, 62 or the second projections 46, 53 with respect to multiple first lattices 23b or second lattices 26b.

[0105] In the above embodiment, a case was described in which liquid can be moved between the first liquid chamber 17 and the second liquid chamber 18 through the gap between the movable plate 40 and the outer space 29b, but the embodiment is not limited to this. For example, the outer space 29b may be divided vertically by the movable plate 40, making it impossible to move liquid between the first liquid chamber 17 and the second liquid chamber 18 through the outer space 29b.

[0106] In the above embodiment, the case in which the annular projections 41 to 44 are continuous in the circumferential direction was described, but it is not limited to this. For example, a slit may be provided in a part of the circumferential direction of the annular projections 41 to 44. Also, the multiple annular projections 41 to 44 may have different heights. The multiple annular projections 41 to 44 are not limited to being arranged on concentric circles, but their centers may be offset from each other.

[0107] In the above embodiment, the case where the heights H1, H3, H4 of the first protrusions 45, 51, 52, 61, 62 and the second protrusions 46, 53 are lower than the height H2 of the annular protrusions 41 to 44 was described, but the embodiment is not limited to this. The first protrusions 45, 51, 52, 61, 62 and the second protrusions 46, 53 may be higher than the annular protrusions 41 to 44.

[0108] Alternatively, the lower surface of the first grid 23b and the upper surface of the second grid 26b at positions opposite to the first protrusions 45, 51, 52, 61, 62 and the second protrusions 46, 53 may be recessed, and the first protrusions 45, 51, 52, 61, 62 and the second protrusions 46, 53 may be raised to the extent that they do not come into contact with them in an unloaded state. The higher the elastic first protrusions 45, 51, 52, 61, 62 and the second protrusions 46, 53 are, the more effectively abnormal noises can be suppressed when they come into contact with the first partition plate 23 and the second partition plate 26.

[0109] In the above embodiment, the case in which the valve 30 and the movable plate 40 are connected by two or three connecting parts 36 has been described, but it is not limited to this. For example, there may be one or four or more connecting parts 36.

[0110] In the above embodiment, the case in which the groove 26e into which the connecting portion 36 fits is formed at the tip of the second cylindrical wall 26a has been described, but it is not limited to this. The groove 26e may be formed at the tip of the first cylindrical wall 23a, or the groove 26e may be formed in both the first cylindrical wall 23a and the second cylindrical wall 26a. Alternatively, the connecting portion 36 may be fitted into a hole that penetrates the first cylindrical wall 23a or the second cylindrical wall 26a radially. In this case, after passing the connecting portion 36 through the hole, the connecting portion 36 can be connected to the valve 30 or the movable plate 40. Furthermore, one of the first cylindrical wall 23a or the second cylindrical wall 26a may be omitted and the other extended. [Explanation of Symbols]

[0111] 10. Liquid-filled vibration isolation device 11. First Member 12 Second Member 13 Vibration Isolation Base 15 diaphragm 17 1st liquid chamber 18 2nd liquid chamber 19. First orifice (orifice) 20, 50, 60 partitions 23. First partition plate 23a First cylindrical wall (part of the cylindrical wall) 23b 1st grid 24b First valve hole 24c 1st through hole 26. Second partition plate 26a Second cylindrical wall (part of the cylindrical wall) 26b 2nd grid 26e groove 27a Second valve hole 27b 2nd through hole 29a Inner space 29b Outside space 30 valves 31,32 Tube valve section 34 blocks 36 Connecting part 40 Movable plate 45,51,52,61,62 1st protrusion (protrusion) 46,53 2nd protrusion (protrusion)

Claims

1. A first member and a cylindrical second member, An elastic vibration-damping base connecting the first member and the second member, An elastic diaphragm attached to the second member and forming a liquid chamber between it and the vibration-damping base, A partition body divides the aforementioned liquid chamber into a first liquid chamber and a second liquid chamber, It comprises 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, A second partition plate facing the second liquid chamber, A cylindrical wall radially divides the space between the first partition plate and the second partition plate into an inner space and an annular outer space, An elastic valve housed in the inner space and displaceable in the axial direction of the cylindrical wall, An annular movable plate made of an elastic material, housed in the outer space and displaceable in the axial direction, The valve and the movable plate are connected by a connecting portion that penetrates the cylindrical wall, The valve comprises cylindrical valve portions that protrude toward the first partition plate and the second partition plate, respectively, and that contact the first partition plate and the second partition plate, respectively, when unloaded. The first partition plate has a first valve hole that penetrates axially, radially outward from the cylindrical valve portion and radially inward from the cylindrical wall, A plurality of first through holes are located radially outside the cylindrical wall, penetrating in the axial direction and arranged in the circumferential direction of the cylindrical wall, It comprises a plurality of first grids formed between a plurality of first through holes, The second partition plate has a second valve hole that penetrates axially and is radially inward from the cylindrical valve portion, A plurality of second through holes are located radially outside the cylindrical wall, penetrating in the axial direction and aligned in the circumferential direction, It comprises a plurality of second grids formed between a plurality of the second through holes, The liquid-filled vibration isolation device is characterized in that the movable plate has a plurality of protrusions that project toward at least one of the plurality of first grids and the plurality of second grids and are spaced apart from each other in the circumferential direction.

2. The plurality of protrusions include a plurality of first protrusions that project toward the plurality of first grids, The liquid-filled vibration isolation device according to claim 1, further comprising a plurality of second protrusions projecting toward a plurality of the second grids.

3. The cylindrical wall is formed by joining the ends of a first cylindrical wall protruding axially from the first partition plate and a second cylindrical wall protruding axially from the second partition plate. A groove into which the connecting portion fits is formed through the radial direction at at least one of the ends of the first cylindrical wall and the second cylindrical wall. The liquid-filled vibration isolation device according to claim 1 or 2, characterized in that the connecting portion fitted into the groove is sandwiched between the first cylindrical wall and the second cylindrical wall and compressed in the axial direction.

4. The circumferential width of the groove is smaller than the free length of the connecting portion in the circumferential direction. The liquid-filled vibration isolation device according to claim 3, characterized in that the connecting portion, which is compressed in the axial direction between the first cylindrical wall and the second cylindrical wall, is in close contact with the wall surfaces on both sides of the groove in the circumferential direction.

5. The liquid-filled vibration damping device according to claim 1 or 2, characterized in that a plurality of connecting portions are provided extending from the valve in two or more directions that intersect each other in the radial direction.

6. The liquid-filled vibration isolation device according to claim 1 or 2, characterized in that the connecting portion that penetrates the cylindrical wall has a smaller dimension in the axial direction than the dimension in the circumferential direction.

7. The liquid-filled vibration damping device according to claim 1 or 2, characterized in that a block is formed between the valve and the cylindrical wall in the connecting portion, with larger dimensions in the axial direction and circumferential direction than the portion that penetrates the cylindrical wall.

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