Liquid sealed type antivibration device

Abstract

To provide a liquid sealed type antivibration device capable of reducing abnormal sound to be generated.SOLUTION: With liquid flow in a second orifice (through-holes 24, 28 and a storage space 31), a movable plate 32 is moved in the second orifice in the moving direction, and the movement is restricted by a first restriction plate 23 and a second restriction plate 27. In the state that the movement of the movable plate 32 is restricted, valves 33-36 provided on the movable plate 32 are deformed in a direction different from the moving direction of the movable plate 32 to contact abutment surfaces 25a, 26a, 29a, 30a. Thus, the second orifice is cut off. The difference of these directions can suppress the speed of the valves 33-36 when contacting the abutment surface 25a or others and reduce abnormal sound to be generated along with the contact.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid-filled vibration-isolating device, and more particularly to a liquid-filled vibration-isolating device capable of reducing the generation of abnormal noise. [Background technology]

[0002] As an example of an anti-vibration device that supports a vibration source such as an engine on a vehicle body (support side), there is known a liquid-sealed anti-vibration device disclosed in Patent Document 1. In the liquid-sealed anti-vibration device disclosed in Patent Document 1, a liquid chamber formed therein is partitioned into a main liquid chamber and an auxiliary liquid chamber by a partition member. The partition member includes a plate-shaped cover member facing the main liquid chamber, a plate-shaped partition member main body facing the auxiliary liquid chamber, and a movable plate arranged between them and made of a disk-shaped elastic body.

[0003] The cover member and the partition member main body are formed with a plurality of communication holes penetrating in the plate thickness direction, and the primary liquid chamber and the secondary liquid chamber are connected by an orifice including the communication holes. The liquid flow in the orifice causes the movable plate to move within the orifice in the plate thickness direction, and this movement is restricted by the cover member and the partition member main body. At this time, the elastic protrusion protruding from the movable plate fits into the communication hole, blocking the orifice including the communication hole, and the damping characteristics of the liquid-filled vibration-proof device are switched. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 039648 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, when an orifice including a communicating hole is blocked, the inner surface of the communicating hole and the outer surface of the elastic protrusion, both of which are formed into a conical shape, come into contact in the direction of movement of the movable plate (plate thickness direction), which creates the problem that abnormal noise is likely to be generated when this contact occurs.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a liquid-filled vibration-damping device that can reduce the generation of abnormal noise. [Means for solving the problem]

[0007] In order to achieve this object, the liquid-sealed vibration-damping device of the present invention comprises a first member and a cylindrical second member, a vibration-damping base made of an elastic material connecting the first member and the second member, a diaphragm made of an elastic material attached to the second member and forming a liquid chamber in which liquid is sealed between the diaphragm and the vibration-damping base, a partition body dividing the liquid chamber into a first liquid chamber and a second liquid chamber, an orifice formed in the partition body connecting the first liquid chamber and the second liquid chamber, a movable plate capable of moving in a movement direction within the orifice due to liquid flow within the orifice, and a valve provided on the movable plate capable of blocking the orifice, wherein the partition body comprises a regulating member regulating the movement of the movable plate in the movement direction, and the valve blocks the orifice by deforming in a direction different from the movement direction and contacting the abutment surface of the partition body when the movement of the movable plate is regulated by the regulating member. Effect of the Invention

[0008] According to the liquid-filled vibration-proof device of claim 1, the liquid flow in the orifice causes the movable plate to move in the moving direction within the orifice, and this movement is restricted by the restricting member of the partition. With the movement of the movable plate restricted, the valve provided on the movable plate deforms in a direction different from the moving direction of the movable plate and contacts the abutment surface of the partition, thereby blocking the orifice. Due to the difference in these directions, the speed at which the valve contacts the abutment surface can be suppressed, and the generation of abnormal noise due to the contact can be reduced.

[0009] According to the liquid-filled vibration-proofing device of claim 2, in addition to the effects of the liquid-filled vibration-proofing device of claim 1, the following effects are achieved. The regulating members are a pair of regulating plates provided on both sides of the movable plate in the thickness direction, which is the moving direction of the movable plate. One or more through holes constituting a part of the orifice are formed through the regulating plate, and an annular groove surrounding the one or more through holes or surrounded by the multiple through holes is formed on the surface on the movable plate side. A valve protruding from the movable plate in the thickness direction is formed in an annular shape along the groove.

[0010] When the orifice is blocked, first, the movement of the movable plate is restricted by the restricting plate, and in this state, at least the tip side of the valve is accommodated in the groove. Next, the valve falls toward the through hole side, and the valve comes into contact with the abutment surface, which is the wall surface of the groove on the through hole side. This stepwise blocking of the orifice makes it possible to suppress the speed at which the valve comes into contact with the abutment surface, and reduces the generation of abnormal noise associated with the contact. Furthermore, by first accommodating the valve in the groove, the opposing area between the valve and the abutment surface is secured, and then the valve falls and comes into contact with the abutment surface, so that the contact area between the valve and the abutment surface can be increased early. This improves the switching sensitivity of the damping characteristics of the liquid-filled vibration isolation device due to the blocking of the orifice.

[0011] According to the liquid-filled vibration-proof device of claim 3, in addition to the effect of the liquid-filled vibration-proof device of claim 2, the following effect is achieved. Between the groove and the through hole, the inner protrusion protrudes from one of the restricting plate and the movable plate facing each other toward the other. As a result, when the movement of the movable plate is restricted by the restricting plate, the timing at which the inner protrusion contacts the restricting plate or the movable plate and the timing at which the valve contacts the restricting plate are shifted, or the inner protrusion is crushed, and the impact at the time of restriction can be mitigated. As a result, it is possible to suppress abnormal noise generated when the movement of the movable plate is restricted by the restricting plate.

[0012] According to the liquid-filled vibration-proof device of claim 4, in addition to the effects of the liquid-filled vibration-proof device of claim 2 or 3, the following effects are achieved. A plurality of through holes are provided in the regulating plate. A central protrusion protrudes from one of the regulating plate and the movable plate facing each other toward the other between the plurality of through holes. The central protrusion can regulate the movable plate at this opposing position from being significantly deformed in the plate thickness direction due to liquid flow (liquid pressure). Therefore, it is possible to suppress abnormal noise caused by the movable plate being significantly deformed due to liquid flow and coming into contact with the regulating plate.

[0013] According to the liquid-filled vibration-proof device of claim 5, in addition to the effects of the liquid-filled vibration-proof device of claim 2 or 3, the following effects are achieved. The width of the valve, which is the dimension in the direction in which the valve and the abutment surface face each other, is smaller than the thickness of the movable plate. This makes it possible to easily deform the valve toward the abutment surface while suppressing the portion of the movable plate away from the valve from deforming and contacting the regulating plate. As a result, it is possible to reduce the generation of abnormal noise caused by contact between the movable plate and the regulating plate, and to improve the switching sensitivity of the damping characteristics of the liquid-filled vibration-proof device by blocking the orifice with the valve. [Brief description of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a liquid-sealed vibration-proof device according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 2(a) is a schematic diagram showing a first stage of characteristic switching of a liquid-filled vibration-proof device, and (b) is a schematic diagram showing a second stage of characteristic switching of a liquid-filled vibration-proof device. [Figure 4] FIG. 11 is a cross-sectional view of a partition body of a liquid-sealed type vibration isolating device in a second embodiment. [Diagram 5] FIG. 4 is a plan view of the partition body with the first restricting plate removed. [Figure 6] FIG. 11 is a cross-sectional view of a partition body of a liquid-sealed type vibration isolating device in a third embodiment. [Figure 7] FIG. 11 is a cross-sectional view of a partition body of a liquid-sealed type vibration isolating device in a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Preferred embodiments will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a liquid-sealed vibration-damping device 10 in a first embodiment. FIG. 1 shows an unloaded state in which no vibration (load) is input to the liquid-sealed vibration-damping device 10. Unless otherwise specified, the unloaded state will be described for each part of the liquid-sealed 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-sealed vibration-damping device 10, but the top and bottom of this liquid-sealed vibration-damping device 10 do not necessarily coincide with the top and bottom of the vehicle to which the liquid-sealed vibration-damping device 10 is attached.

[0016] The hydraulic vibration-proof device 10 is an engine mount that elastically supports an automobile engine. The hydraulic vibration-proof device 10 mainly comprises a first member 11 that is attached to the engine side, which is a vibration source, a cylindrical second member 12 that is attached to the vehicle body on the support side, and a vibration-proof base 13 that is made of an elastic body that connects the first member 11 and the second member 12. The cross-sectional view of the hydraulic vibration-proof device 10 in FIG. 1 is an axial cross-sectional view including the axis C of the cylindrical second member 12. The direction of the axis C is the up-down direction of the hydraulic vibration-proof device 10. In the following description, the direction perpendicular to the axis C is simply referred to as the radial direction, and the direction around the axis C is simply referred to as the circumferential direction.

[0017] 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.

[0018] 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 includes a large diameter portion 12a on the upper end side, a reduced diameter portion 12b that is connected to the lower end of the large diameter portion 12a and has gradually smaller inner and outer diameters toward the bottom, and a small diameter portion 12c that is connected to the lower end of the reduced diameter portion 12b and has smaller inner and outer diameters than the large diameter portion 12a. For example, the second member 12 is attached to the vehicle body by being inserted into a cylindrical bracket provided on the vehicle body.

[0019] The vibration-isolating base 13 is a member made of an elastic body such as rubber or a thermoplastic elastomer formed into a substantially umbrella shape. The vibration-isolating base 13 is vulcanization-bonded to the lower part of the first member 11 and to the inner peripheral surfaces of the large diameter portion 12a and the reduced diameter portion 12b, respectively, to connect them. A rubber membrane-like film portion 14 that covers the inner peripheral surface of the small diameter portion 12c is connected to the lower end of the vibration-isolating base 13. This film portion 14 is a part of the second member 12.

[0020] 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 to the inner periphery of the attachment portion 16 over the entire circumference.

[0021] 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.

[0022] 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 with the diaphragm 15 integrated therewith is inserted into the small diameter portion 12c, and then the small diameter portion 12c (second member 12) is 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. In this way, the diaphragm 15 and the partition 20 are attached to the second member 12.

[0023] The partition body 20 will be described with reference to FIG. 2 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 II in FIG. 2. The partition body 20 includes a cylindrical member 21 held inside the membrane portion 14, a flat first restricting plate 23 and a flat second restricting plate 27 that separate the inner circumferential side of the cylindrical member 21 into upper and lower portions, and a movable plate 32 disposed between the first restricting plate 23 and the second restricting plate 27. The first restricting plate 23 facing the first liquid chamber 17 and the second restricting plate 27 facing the second liquid chamber 18 are stacked one above the other and joined by welding, adhesion, or press-fitting.

[0024] 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. A first orifice 19 is formed between the outer peripheral groove 22 and the membrane portion 14.

[0025] One end of the outer circumferential groove 22 opens into the inner circumferential surface of the cylindrical member 21 above the first restricting plate 23 or opens into 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 into the inner circumferential surface of the cylindrical member 21 below the second restricting plate 27 or opens into the lower end of the cylindrical member 21, thereby connecting the first orifice 19 to the second liquid chamber 18.

[0026] Thus, the first orifice 19 is a flow passage that communicates the first fluid chamber 17 and the second fluid chamber 18. In order to attenuate shake vibrations, for example, when a vehicle is traveling, the flow passage cross-sectional area, length, cross-sectional circumference, etc. of the first orifice 19 are set so that the damping coefficient becomes large in a frequency band (for example, about 5 to 15 Hz) corresponding to the shake vibrations when a large amplitude shake vibration is input.

[0027] The first restricting plate 23 is a part made of metal or synthetic resin, and is formed in a disk shape perpendicular to the axis C. A cylindrical tube wall 23a centered on the axis C protrudes downward (toward the second restricting plate 27) from the lower surface of the first restricting plate 23. The first restricting plate 23 is formed in an annular plate shape with the inside of this tube wall 23a omitted.

[0028] A cylindrical portion 23e extends upward from the outer circumferential edge of the first restricting plate 23, and a flange 23f extends radially outward from the upper end edge of the cylindrical portion 23e. The first restricting plate 23 is attached to the cylindrical member 21 by fitting the cylindrical portion 23e into the inner circumferential side of the cylindrical member 21 until the flange 23f comes into contact with the upper end of the cylindrical member 21. The flange 23f that has come into contact with the upper end of the cylindrical member 21 comes into contact with the step 13a of the vibration-proof base 13. In addition, portions of the cylindrical portion 23e and the flange 23f in the circumferential direction are omitted so as not to block the opening of the outer circumferential groove 22 on the first liquid chamber 17 side.

[0029] The second restricting plate 27 is a disk-shaped member perpendicular to the axis C. The second restricting plate 27 has an outer circumferential edge connected to the inner circumferential surface of the tubular member 21 over the entire circumference, and is molded integrally with the tubular member 21. A cylindrical tube wall 27a centered on the axis C protrudes upward (toward the first restricting plate 23) from a position facing the tube wall 23a on the upper surface of the second restricting plate 27. The inner and outer diameters of the tube wall 27a are the same as those of the tube wall 23a. The tips of the tube wall 23a and the tube wall 27a are joined to each other by welding or the like.

[0030] An annular accommodation space 31 is formed between the first regulating plate 23 and the second regulating plate 27 attached to the tubular member 21 in the vertical direction and between the tubular walls 23a, 27a and the tubular member 21 in the radial direction.

[0031] A plurality of through holes 24 are formed in the first restricting plate 23 in the plate thickness direction (up-down direction) radially outward of the cylindrical wall 23a. The through holes 24 connect the accommodation space 31 and the first liquid chamber 17. The plurality of through holes 24 are arranged side by side in the circumferential direction. A plurality of first lattices 23b are formed in the first restricting plate 23 between the plurality of through holes 24. The first lattices 23b extend radially with a substantially constant width from the axis C as the center.

[0032] Furthermore, a groove 25 surrounding the multiple through holes 24 and a groove 26 surrounded by the multiple through holes 24 are formed on the lower surface of the first restricting plate 23 facing the storage space 31. Both of the grooves 25 and 26 are formed in an annular shape centered on the axis C. On the lower surface of the first restricting plate 23, a portion between the groove 25 and the through hole 24 or the first lattice 23b is a wall surface 23c, and a portion between the groove 26 and the through hole 24 or the first lattice 23b is a wall surface 23d.

[0033] A plurality of through holes 28 are formed in the second restricting plate 27 in the plate thickness direction (up-down direction) radially outward of the cylindrical wall 27a. The through holes 28 connect the accommodation space 31 and the second liquid chamber 18. The through holes 28 are arranged side by side in the circumferential direction. A plurality of second lattices 27b are formed in the second restricting plate 27 between the plurality of through holes 28. The second lattices 27b extend radially with a substantially constant width from the axis C as the center.

[0034] Furthermore, a groove 29 surrounding the multiple through holes 28 and a groove 30 surrounded by the multiple through holes 28 are formed on the upper surface of the second restricting plate 27 facing the storage space 31. Both of the grooves 29 and 30 are formed in an annular shape centered on the axis C. On the upper surface of the second restricting plate 27, a portion between the groove 29 and the through holes 28 or the second lattice 27b is a wall surface 27c, and a portion between the groove 30 and the through holes 28 or the second lattice 27b is a wall surface 27d.

[0035] The through hole 28, the second lattice 27b, and the grooves 29 and 30 are set in shape, position, and dimensions symmetrical (mirror) to the through hole 24, the first lattice 23b, and the grooves 25 and 26 of the first regulating 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 FIG.

[0036] The movable plate 32 is a member made of an elastic body such as rubber or thermoplastic elastomer, and is formed of an annular flat plate centered on the axis C. The movable plate 32 is disposed in the accommodation space 31 between the first restricting plate 23 and the second restricting plate 27, and surrounds the cylindrical walls 23a, 27a. The liquid pressure of the first liquid chamber 17 and the second liquid chamber 18 is applied to the movable plate 32 in the accommodation space 31 via the through holes 24, 28. The movable plate 32 moves up and down due to this liquid pressure.

[0037] On the upper surface of the movable plate 32, a valve 33 protruding upward from the outer periphery of the movable plate 32 and a valve 34 protruding upward from the inner periphery of the movable plate 32 are provided. On the lower surface of the movable plate 32, a valve 35 protruding downward from the outer periphery of the movable plate 32 and a valve 36 protruding downward from the inner periphery of the movable plate 32 are provided. The valves 33, 34, 35, 36 are formed in annular shapes centered on the axis C so as to face each other vertically along the grooves 25, 26, 29, 30 (hereinafter abbreviated as "groove 25, etc."), respectively.

[0038] The height H (vertical dimension) of the valves 33 to 36 is the same. The width (radial dimension) of the valves 33 to 36 gradually decreases toward the tip, and the width W at half the height H is the same for all valves 33 to 36. Since the height H is greater than the width W, the valves 33 to 36 are easily deformed in the width W direction (radial direction).

[0039] The vertical dimension from the upper ends, which are the tips of the valves 33 and 34, to the lower ends, which are the tips of the valves 35 and 36, is smaller than the vertical dimension of the accommodation space 31. Furthermore, the inner diameter of the accommodation space 31 (the outer diameter of the cylindrical walls 23a and 27a) is smaller than the inner diameter of the movable plate 32, and the outer diameter of the accommodation space 31 (the inner diameter of the cylindrical member 21) is larger than the outer diameter of the movable plate 32. Therefore, when the movable plate 32 is positioned at the center of the accommodation space 31 and the valves 33 to 36 are not in contact with each wall surface of the accommodation space 31, a second orifice that communicates between the first liquid chamber 17 and the second liquid chamber 18 is formed by the gaps between each wall surface of the accommodation space 31 and the movable plate 32 and the through holes 24 and 28.

[0040] The flow passage cross-sectional area, length, cross-sectional circumference, etc. of this second orifice are set so that the spring constant is low in a frequency band corresponding to idle vibration (for example, about 15 to 50 Hz) when small amplitude idle vibration is input, for example, in order to reduce idle vibration during idling (when the vehicle is stopped).

[0041] When the movable plate 32 moves up and down due to the liquid flow in the second orifice, the movement is restricted by the first restricting plate 23 or the second restricting plate 27, and the second orifice may be blocked. When the second orifice is blocked, the damping characteristics of the first orifice 19 are mainly exerted. In other words, the damping characteristics of the liquid-filled vibration isolation device 10 are switched by switching between communication and blocking of the second orifice.

[0042] The movement of each part when the second orifice is blocked and the damping characteristics are switched will be described in detail with reference to Figures 3(a) and 3(b). Figure 3(a) is a schematic diagram showing the first stage of characteristic switching of the liquid-filled vibration-damping device 10. Figure 3(b) is a schematic diagram showing the second stage of characteristic switching of the liquid-filled vibration-damping device 10. Figures 3(a) and 3(b) show an enlarged view of the vicinity of the valve 36 and groove 30 on the left side of the enlarged view in Figure 1.

[0043] 3(a), in the first stage, when liquid flows from the first liquid chamber 17 to the second liquid chamber 18 in the second orifice, the movable plate 32 moves downward. If the liquid flow is strong, the tip side of the valve 36 is accommodated in the groove 30. At this time, the tip side of the valve 35 is also accommodated in the groove 29. Furthermore, the outer peripheral surface of the tapered valve 36 contacts the corner between the groove 30 and the wall surface 27d, and the inner peripheral surface of the tapered valve 35 contacts the corner between the groove 29 and the wall surface 27c. As a result, the downward movement of the movable plate 32 is restricted by the second restricting plate 27.

[0044] 3(b), in the second stage, the liquid pressure of the liquid flowing toward the through hole 28 acts on the valve 36, and the valve 36 is deformed so as to fall radially outward (toward the through hole 28). As a result, the outer peripheral surface of the valve 36 comes into contact with the abutment surface 30a, which is the radially outer wall surface of the groove 30, over the entire circumference. Similarly, the liquid pressure causes the valve 35 to deform so as to fall radially inward (toward the through hole 28), and the valve 35 comes into contact with the abutment surface 29a, which is the radially inner wall surface of the groove 29, over the entire circumference. As a result, the second orifice is blocked.

[0045] Incidentally, when the movable plate 32 moves upward due to the liquid flow in the second orifice from the second liquid chamber 18 to the first liquid chamber 17, the second orifice is blocked in the same manner as described above. Specifically, in the first stage, the tip side of the valve 33 is accommodated in the groove 25, and the tip side of the valve 34 is accommodated in the groove 26, while the valves 33 and 34 come into contact with the corners between the grooves 25 and 26 and the wall surfaces 23c and 23d, respectively. As a result, the upward movement of the movable plate 32 is restricted by the first restricting plate 23.

[0046] Next, in the second stage, the valves 33 and 34 are deformed so as to fall toward the through-hole 24. As a result, the inner circumferential surface of the valve 33 comes into contact over the entire circumference with the abutment surface 25a, which is the wall surface of the groove 25 on the through-hole 24 side, and the outer circumferential surface of the valve 34 comes into contact with the abutment surface 26a, which is the wall surface of the groove 26 on the through-hole 24 side. This blocks the second orifice.

[0047] As described above, since the vertical direction in which the movable plate 32 moves in the first stage is different from the radial direction in which the valves 33 to 36 deform in the second stage, the speed at which the valves 33 to 36 come into contact with the contact surfaces 25a, 26a, 29a, 30a (hereinafter abbreviated as "contact surface 25a, etc.") can be reduced compared to when these directions are the same. That is, the speed at which the movable plate 32 moves due to the liquid flow is less likely to be added to the speed at which the valves 33 to 36 come into contact with the contact surfaces 25a, etc. As a result, the generation of abnormal noises (smacking sounds) accompanying contact between the valves 33 to 36 and the contact surfaces 25a, etc. can be reduced.

[0048] For example, if there is no groove 25, the valves 33-36 are pressed vertically against the first regulating plate 23 and the second regulating plate 27 as the movable plate 32 moves vertically due to the liquid flow. This causes the contact area between the valves 33-36 and the first regulating plate 23 and the second regulating plate 27 to gradually increase, and when this contact area exceeds a predetermined value, blocking of the second orifice is completed. In this case, it takes time for the contact area to increase, and the switching sensitivity of the damping characteristics of the liquid-filled vibration isolator 10 due to blocking of the second orifice is low.

[0049] In contrast, in this embodiment, the valves 33-36 are accommodated in the grooves 25 etc. in the first stage, thereby ensuring the radial facing area between the valves 33-36 and the abutment surfaces 25a etc., and then the valves 33-36 come into contact with the abutment surfaces 25a etc. in the second stage. This makes it possible to increase the contact area between the valves 33-36 and the abutment surfaces 25a etc. at an early stage. This improves the switching sensitivity of the damping characteristics of the liquid-filled vibration isolator 10 due to blocking of the second orifice.

[0050] The width W of the valves 33-36 is smaller than the plate thickness T of the movable plate 32. This makes it possible to easily deform the valves 33-36 toward the contact surface 25a, etc., while suppressing the radial center portion of the movable plate 32 away from the valves 33-36 from deforming in the vertical direction and contacting the first lattice 23b of the first regulating plate 23 or the second lattice 27b of the second regulating plate 27. This makes it possible to reduce the generation of abnormal noise caused by contact between the movable plate 32 and the first regulating plate 23 or the second regulating plate 27, and improve the switching sensitivity of the damping characteristics of the liquid-filled vibration isolator 10 by blocking the second orifice with the valves 33-36.

[0051] The height H of the valves 33 to 36 is slightly larger than the depth D (the dimension in the vertical direction) of the groove 25. This makes it possible to prevent the movable plate 32 from contacting the wall surfaces 23c, 23d, 27c, and 27d (hereinafter abbreviated as "wall surface 23c, etc.") even if the tip of the valve 33 to 36 contacts the bottom of the groove 25. This makes it possible to reduce the generation of abnormal noise caused by contact between the movable plate 32 and the wall surface 23c, etc.

[0052] Next, a second embodiment will be described with reference to Figures 4 and 5. In the first embodiment, a case where the movable plate 32 is not fixed to the partition body 20 has been described. In contrast, in the second embodiment, a case where the movable plate 32 is fixed to the partition body 40 will be described. Note that the same parts as in the first embodiment are given the same reference numerals and the following description will be omitted.

[0053] Fig. 4 is a cross-sectional view of a partition body 40 of a liquid-sealed vibration-proof device in the second embodiment. As with Fig. 1, the cross-sectional view of Fig. 4 shows a cross-sectional view passing through the through hole 24 on the right side of the axis C, and a cross-sectional view not passing through the through hole 24 on the left side of the axis C. Fig. 5 is a plan view of the partition body 40 with the first regulating plate 41 removed.

[0054] The partition body 40 is assembled to the liquid-sealed vibration-damping device 10 in place of the partition body 20 in the first embodiment. The partition body 40 includes a cylindrical member 21, a flat first restricting plate 41 and a flat second restricting plate 42 that separate the inner periphery side of the cylindrical member 21 into upper and lower portions, and a movable plate 32 and a valve 44 that are disposed between the first restricting plate 41 and the second restricting plate 42.

[0055] The first restricting plate 41 is configured in the same way as the first restricting plate 23 in the first embodiment, except that the plate material extends inward beyond the cylindrical wall 23a. The first restricting plate 41 on the inner side of the cylindrical wall 23a has one central hole 41a provided on the axis C and a plurality of first valve holes 41b provided in a row around the central hole 41a, which are formed penetrating the first restricting plate 41 in the plate thickness direction.

[0056] The second restricting plate 42 is configured in the same manner as the second restricting plate 27 in the first embodiment, except that one second valve hole 42a is provided on the axis C and that a mounting groove 27e is provided at the upper end of the cylindrical wall 27a. An inner space 43 is formed between the first restricting plate 41 and the second restricting plate 42 in the vertical direction, radially inward of the cylindrical walls 23a, 27a.

[0057] The second valve hole 42a is formed penetrating the second restricting plate 42 in the plate thickness direction. The mounting groove 27e is provided by cutting out a part of the upper end of the cylindrical wall 27a downward so as to penetrate the cylindrical wall 27a in the radial direction. The mounting grooves 27e are located at two positions symmetrical with respect to the axis C.

[0058] The valve 44 is a member made of an elastic body such as rubber or a thermoplastic elastomer, and is formed in a disk shape centered on an axis C. The valve 44 is housed in an inner space 43 between the first restricting plate 41 and the second restricting plate 42, and is separated from the cylindrical walls 23a and 27a over the entire circumference.

[0059] The valve 44 includes a cylindrical valve portion 45 that protrudes upward from the upper surface toward the first restricting plate 41, and a cylindrical valve portion 46 that protrudes downward from the lower surface toward the second restricting plate 42. The cylindrical valve portions 45, 46 are formed in a cylindrical shape centered on the axis C. The outer peripheral surfaces of the cylindrical valve portions 45, 46 are formed in a tapered shape that decreases in diameter toward the tip. The cylindrical valve portion 45 and the cylindrical valve portion 46 are arranged symmetrically in the vertical direction.

[0060] In the no-load state of the liquid-filled vibration-proof device including the partition body 40, the cylindrical valve portion 45 contacts the first regulating plate 41 radially outward from the central hole 41a and radially inward from the first valve holes 41b over its entire circumference. Also, in the no-load state, the cylindrical valve portion 46 contacts the second regulating plate 42 radially outward from the second valve hole 42a over its entire circumference. Thus, in the no-load state, the valve 44 blocks the movement of liquid between the first liquid chamber 17 and the second liquid chamber 18 via the inner space 43.

[0061] On the other hand, when a large load (large amplitude vibration) is input to the liquid-filled vibration-proof device and the first liquid chamber 17 is excessively negatively pressurized due to the deformation of the vibration-proof base 13, the valve 44 is displaced toward the first regulating plate 41, and the cylinder valve portion 45 is crushed. This causes the cylinder valve portion 46 and the second regulating plate 42 to separate from each other. As a result, liquid flows from the second liquid chamber 18 through the second valve hole 42a, the inner space 43, and the first valve hole 41b into the first liquid chamber 17. This eliminates the excessive negative pressure in the first liquid chamber 17, and suppresses cavitation caused by the negative pressure. A part that functions in this way is called a cavitation valve.

[0062] When the first fluid chamber 17 is under positive pressure, the force pressing the cylindrical valve portion 46 against the second restricting plate 42 only increases, and the movement of liquid through the inner space 43 is blocked by the valve 44, similar to the no-load state. Furthermore, since the fluid pressure from the first fluid chamber 17 is applied to the center of the valve 44 through the central hole 41a, it is possible to make it difficult for liquid to leak through the gap between the cylindrical valve portion 46 and the second restricting plate 42.

[0063] Two connecting portions 48 extend radially outward from the valve 44. The two connecting portions 48 are disposed symmetrically with respect to the axis C. The connecting portions 48 are fitted into the mounting grooves 27e of the cylindrical wall 27a, thereby penetrating the cylindrical walls 23a, 27a and being connected to the inner peripheral edge of the movable plate 32.

[0064] The vertical depth of the mounting groove 27e is smaller than the vertical free length of the connecting portion 48. Therefore, the connecting portion 48 fitted in the mounting groove 27e is compressed in the vertical direction between the cylindrical wall 23a and the cylindrical wall 27a. This makes it difficult for the valve 44 to shift radially relative to the first and second restricting plates 41 and 42. As a result, it is possible to suppress the generation of abnormal noise caused by friction between the wall surface of the mounting groove 27e and the connecting portion 48.

[0065] If the valve 44 were to shift relative to the first and second restricting plates 41 and 42, the first valve hole 41b and the second valve hole 42a would be blocked by the valve 44, which could reduce the cavitation suppression effect of the valve 44. In addition, the second valve hole 42a would be located on the radially outer side of the cylindrical valve portion 46, which could cause liquid to constantly move between the first and second liquid chambers 17 and 18 via the inner space 43, which could cause the valve 44 to no longer function as a cavitation valve. Therefore, by making it difficult for the valve 44 to shift radially relative to the first and second restricting plates 41 and 42, it is possible to make the valve 44 more likely to function as a cavitation valve, and to prevent a reduction in the cavitation suppression effect.

[0066] In addition, since the width of the mounting groove 27e in the circumferential direction (the vertical direction in FIG. 5) is greater than the free length of the connecting portion 48 in the circumferential direction, it is possible to easily insert the connecting portion 48 into the mounting groove 27e. After this insertion, when the tip of the cylindrical wall 23a is pressed against the tip of the cylindrical wall 27a and the connecting portion 48 is compressed in the vertical direction between the cylindrical wall 23a and the cylindrical wall 27a, the connecting portion 48 comes into close contact with the wall surfaces on both sides in the circumferential direction of the mounting groove 27e. This makes it difficult for liquid to leak between the inner space 43 and the accommodation space 31 through the gap between the mounting groove 27e and the connecting portion 48.

[0067] At the connecting portion 48, a block 47 having dimensions larger in the up-down and circumferential directions than the portion that fits into the mounting groove 27e is formed between the valve 44 and the cylindrical wall 27a. This block 47 makes it difficult for the valve 44 to shift radially relative to the first and second restricting plates 41 and 42. As a result, the valve 44 can easily function as a cavitation valve, and a reduction in the cavitation suppression effect can be suppressed.

[0068] Furthermore, when liquid tries to pass through the gap between the mounting groove 27e and the connecting portion 48, the flow resistance can be increased by the block 47. This makes it even more difficult for liquid to leak between the inner space 43 and the accommodation space 31 through the gap.

[0069] In addition, the movable plate 32 is molded integrally with the valve 44 via the connecting portion 48. This improves the productivity of the movable plate 32, the connecting portion 48, and the valve 44 compared to a case in which the movable plate 32, the connecting portion 48, and the valve 44 are molded separately and then integrated.

[0070] The movable plate 32 is connected to the connecting portion 48, but since the connecting portion 48 is thin in the vertical direction, the connection hardly hinders the vertical movement of the movable plate 32 due to the liquid flow. In addition, the movable plate 32 is radially positioned in the accommodation space 31 by being connected to the connecting portion 48, and the groove 25 and the valves 33 to 36 can be easily maintained in a state where they face each other vertically. This makes it easier to quickly accommodate the valves 33 and 34 in both the grooves 25 and 26 over the entire circumference in the first stage of blocking the second orifice, and makes it easier to quickly accommodate the valves 35 and 36 in both the grooves 29 and 30 over the entire circumference. Therefore, the switching sensitivity of the damping characteristics of the liquid-filled vibration-proof device due to blocking of the second orifice can be improved.

[0071] The upper surface of the movable plate 32 is provided with an inner protrusion 51 protruding upward adjacent to the inside (inner circumferential side) of the valve 33, an inner protrusion 52 protruding upward adjacent to the inside (outer circumferential side) of the valve 34, and a central protrusion 56 located in the radial center and protruding upward. The lower surface of the movable plate 32 is provided with an inner protrusion 53 protruding downward adjacent to the inside (inner circumferential side) of the valve 35, an inner protrusion 54 protruding downward adjacent to the inside (outer circumferential side) of the valve 36, and a central protrusion 57 located in the radial center and protruding downward.

[0072] The inner protrusions 51-54 are all formed in an annular shape centered on the axis C. The inner protrusion 51 faces the wall surface 23c from above and below, and the inner protrusion 52 faces the wall surface 23d from above and below. The inner protrusion 53 faces the wall surface 27c from above and below, and the inner protrusion 54 faces the wall surface 27d from above and below. The height (vertical dimension) of the inner protrusions 51-54 is configured to be approximately the same as the height H of the valves 33-36.

[0073] As a result, in the first stage of blocking the second orifice, the inner protrusions 51-54 come into contact with the wall surface 23c, etc., and then the valves 33-36 come into contact with the corners between the grooves 25, etc. and the wall surface 23c, etc., while the inner protrusions 51-54 are being crushed, thereby restricting the movement of the movable plate 32. In this way, the timing at which the inner protrusions 51-54 come into contact with each part of the first restricting plate 41 or the second restricting plate 42 differs from the timing at which the valves 33-36 come into contact with each part, or the inner protrusions 51-54 are being crushed, etc., thereby mitigating the impact when the movement of the movable plate 32 is restricted. As a result, it is possible to suppress abnormal noise generated when the movement of the movable plate 32 is restricted by the first restricting plate 41 or the second restricting plate 42.

[0074] The central protrusions 56 are arranged at intervals in the circumferential direction so as to face above and below the multiple first lattices 23b arranged at intervals in the circumferential direction, respectively. The central protrusions 57 are arranged at intervals in the circumferential direction so as to face above and below the multiple second lattices 27b arranged at intervals in the circumferential direction, respectively.

[0075] The height (vertical dimension) of the central protrusions 56, 57 is smaller than the height H of the valves 33-36 and the height of the inner protrusions 51-54. In this embodiment, the height of the central protrusions 56, 57 is set so that the central protrusions 56, 57 do not come into contact with the first lattice 23b or the second lattice 27b when the valves 33-36 are in contact with the first regulating plate 41 or the second regulating plate 42 in the first stage of blocking the second orifice.

[0076] However, the central protrusions 56, 57 may be configured to contact the first lattice 23b or the second lattice 27b before the valves 33 to 36 contact the first restricting plate 41 or the second restricting plate 42. In this case, the impact when the movement of the movable plate 32 is restricted can be mitigated by shifting the timing at which the central protrusions 56, 57 contact each part of the first restricting plate 41 or the second restricting plate 42 and the timing at which the valves 33 to 36 contact each part, or by crushing the central protrusions 56, 57. As a result, it is possible to suppress abnormal noise generated when the movement of the movable plate 32 is restricted by the first restricting plate 41 or the second restricting plate 42.

[0077] Here, if the central protrusions 56, 57 were not present, the central portion of the movable plate 32 in the radial direction, which is distant from the valves 33 to 36, would be significantly deformed in the plate thickness direction due to the liquid flow (liquid pressure), and would come into contact with the first lattice 23b or the second lattice 27b with great force. In contrast, in this embodiment, the central protrusions 56, 57 can prevent the central portion of the movable plate 32 in the radial direction from being significantly deformed in the plate thickness direction. Therefore, it is possible to suppress abnormal noise caused by the movable plate 32 being significantly deformed due to the liquid flow and coming into contact with the first lattice 23b or the second lattice 27b.

[0078] Next, a third embodiment will be described with reference to Fig. 6. In the second embodiment, a case has been described in which the movable plate 32 is positioned radially within the accommodation space 31 by sandwiching the connecting portion 48 connected to the movable plate 32 between the first restricting plate 41 and the second restricting plate 42. In contrast, in the third embodiment, a case will be described in which the movable plate 32 is positioned radially within the accommodation space 31 by restricting protrusions 61, 62 protruding from the movable plate 32. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and the following description will be omitted.

[0079] Fig. 6 is a cross-sectional view of a partition body 60 of a liquid-sealed vibration-proof device in the third embodiment. In the cross-sectional view of Fig. 6, similar to Fig. 1, a cross-sectional view passing through the through hole 24 is shown on the right side of the axis C, and a cross-sectional view not passing through the through hole 24 is shown on the left side of the axis C.

[0080] The partition body 60 is assembled to the liquid-sealed type vibration isolating device 10 in place of the partition body 20 in the first embodiment. The partition body 60 includes a cylindrical member 21, a first regulating plate 23, a second regulating plate 27, a movable plate 32, and regulating protrusions 61, 62 provided on the movable plate 32.

[0081] The restricting protrusion 61 is a portion that protrudes upward from the upper surface of the movable plate 32, and a tip side thereof is received in the through hole 24. A plurality of restricting protrusions 61 are provided intermittently in the circumferential direction so as to be received in each of the multiple through holes 24. The restricting protrusion 62 is a portion that protrudes downward from the lower surface of the movable plate 32, and a tip side thereof is received in the through hole 28. A plurality of restricting protrusions 62 are provided intermittently in the circumferential direction so as to be received in each of the multiple through holes 28.

[0082] The inner surfaces of the regulating projections 61, 62 on the axis C side are provided along the wall surfaces of the through holes 24, 28 on the axis C side with a slight gap therebetween. This allows the movable plate 32 to be positioned radially within the accommodation space 31, making it easier to maintain a state in which the grooves 25 etc. and the valves 33 to 36 face each other vertically. As a result, similar to the second embodiment, it is possible to improve the switching sensitivity of the damping characteristics of the liquid-filled type vibration isolator by blocking the second orifice.

[0083] Furthermore, in the third embodiment, the movable plate 32 is not fixed to the partition body 60 and floats in the accommodation space 31, so that the vertical movement of the movable plate 32 due to the liquid flow can be smooth. Therefore, the switching sensitivity of the damping characteristics of the liquid-filled type vibration isolator due to the blocking of the second orifice can be further improved.

[0084] The heights (vertical dimensions) of the regulating protrusions 61, 62 are set so that both of the regulating protrusions 61, 62 are located within the through holes 24, 28, respectively, even in a state in which the vertical movement of the movable plate 32 is regulated by the first regulating plate 23 and the second regulating plate 27. This makes it possible to prevent the regulating protrusions 61, 62 from coming out of the through holes 24, 28 as the movable plate 32 moves, and makes it easier to maintain the state in which the grooves 25 etc. and the valves 33 to 36 face each other vertically.

[0085] Furthermore, the width, which is the radial dimension, of the regulating protrusions 61, 62 is greater than the width W of the valves 33 to 36. Therefore, the regulating protrusions 61, 62 are unlikely to fall in the radial direction, and radial displacement between the grooves 25 etc. and the valves 33 to 36 due to the fall can be suppressed.

[0086] Next, a fourth embodiment will be described with reference to Fig. 7. In the second embodiment, a case was described in which the movable plate 32 is fixed to the partition body 40 by sandwiching the connecting portion 48 connected to the movable plate 32 between the first restricting plate 41 and the second restricting plate 42. In contrast, in the fourth embodiment, a case will be described in which the movable plate 32 is fixed to the partition body 70 by sandwiching the inner peripheral edge side of the movable plate 32 between the first restricting plate 71 and the second restricting plate 73. Note that the same parts as in the first embodiment are denoted by the same reference numerals, and the following description will be omitted.

[0087] Fig. 7 is a cross-sectional view of a partition body 70 of a liquid-sealed vibration-damping device in the fourth embodiment. In the cross-sectional view of Fig. 7, similar to Fig. 1, a cross-sectional view passing through the through hole 24 is shown on the right side of the axis C, and a cross-sectional view not passing through the through hole 24 is shown on the left side of the axis C.

[0088] The partition body 70 is assembled to the liquid-sealed vibration-proof device 10 in place of the partition body 20 in the first embodiment. The partition body 70 includes a cylindrical member 21, flat first and second restricting plates 71 and 73 which separate the inner periphery side of the cylindrical member 21 into upper and lower portions, and a movable plate 32 disposed between the first restricting plate 71 and the second restricting plate 73. The movable plate 32 in the fourth embodiment is configured in the same manner as the movable plate 32 in the first embodiment, except that the radial dimensions between the valves 33, 34 and between the valves 35, 36 are increased.

[0089] The first restricting plate 71 and the second restricting plate 73 are made of metal or synthetic resin and are formed in a disk shape perpendicular to the axis C. As in the first embodiment, the first restricting plate 71 is provided with a plurality of through holes 24, and a first lattice 23b is provided between them. Note that the through holes 24 and the first lattice 23b in the fourth embodiment are formed to extend radially inward compared to the first embodiment. The configuration of the first restricting plate 71 radially outward from the through holes 24 is configured in the same manner as the first restricting plate 23 in the first embodiment.

[0090] Similar to the first embodiment, the second restricting plate 73 is provided with a plurality of through holes 28, and the second lattice 27b is provided between them. Note that the through holes 28 and the second lattice 27b in the fourth embodiment are formed to extend radially inward compared to the first embodiment. The second restricting plate 73 has a configuration on the radially outer side of the through holes 28 that is the same as the second restricting plate 27 in the first embodiment.

[0091] A cylindrical central protrusion 72 centered on the axis C protrudes downward from the lower surface of the first restricting plate 71. A cylindrical central protrusion 74 centered on the axis C protrudes upward from the upper surface of the second restricting plate 73. The tips of the central protrusions 72, 74 are joined to each other by welding or the like. An annular accommodation space 31 in which the movable plate 32 is accommodated is formed between the first restricting plate 71 and the second restricting plate 73 in the vertical direction and between the central protrusions 72, 74 and the cylindrical member 21 in the radial direction.

[0092] The movable plate 32 is fixed to the partition body 70 by having the inner peripheral edge side including the valves 34, 36 sandwiched between the central protrusions 72, 74. In this case, the through holes 24, 28 and the space between the outer peripheral edge side of the movable plate 32 and the wall surface of the accommodation space 31 form the second orifice. In the fourth embodiment, as in the first embodiment, the valves 33, 35 are accommodated in the grooves 25, 29 in the first stage, and the valves 33, 35 come into contact with the abutment surfaces 25a, 29a in the second stage, thereby blocking the second orifice. This can reduce the generation of abnormal noise (smacking sound) caused by the contact between the valves 33, 35 and the abutment surfaces 25a, 29a when the second orifice is blocked.

[0093] In the fourth embodiment, since the movable plate 32 is fixed to the partition 70, it is easy to maintain the grooves 25, 29 and the valves 33, 35 facing each other vertically, as in the second embodiment. Therefore, it is possible to improve the switching sensitivity of the damping characteristics of the liquid-sealed vibration isolator by blocking the second orifice.

[0094] Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment, and it can be easily assumed 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 in the radial direction from the axis C. The axis C of the second member 12 may be offset from the axis C of the movable plate 32, the cylindrical wall 23a, and the cylindrical wall 27a.

[0095] 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, 40, 60, 70, etc. The two liquid chambers may be communicated with each other through an orifice other than the first orifice 19. The first orifice 19 may be omitted.

[0096] 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 made into an enclosed space, giving the liquid-sealed vibration-damping device 10 an air spring effect. 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 due to air passing through the through hole may be added to the liquid-sealed vibration-damping device 10.

[0097] In the above embodiment, an engine mount is given as an example of an application of the hydraulic vibration isolator 10, but the application may be arbitrary. Other application may be, for example, a motor mount, a member mount, or 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 may be attached 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 may be attached to the vibration receiver side.

[0098] In the above embodiment, a case has been described in which a portion of the chamber wall of the first liquid chamber 17 is formed by the vibration-isolating base 13, and a portion of the chamber wall of the second liquid chamber 18 is formed by the diaphragm 15, 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.

[0099] Part of the above embodiment may be omitted. For example, the cylindrical portion 23e and the flange 23f of the first regulating plate 23, 41, 71 may be omitted. The membrane portion 14 may be omitted, and the partition body 20, 40, 60, 70 and the diaphragm 15 may be attached to the inner peripheral surface of the second member 12. The inner projections 51 to 54 and the central projections 56, 57 in the second embodiment may be omitted. One of the cylindrical wall 23a or the cylindrical wall 27a may be omitted, and the other may be extended. The connecting portion 48 in the second embodiment may be omitted, and the movable plate 32 and the valve 44 may be independent.

[0100] A part of each of the above-mentioned embodiments may be combined with a part of another embodiment. For example, the inner projections 51-54 and the central projections 56, 57 in the second embodiment may be provided on the movable plate 32 in the first, third, and fourth embodiments. Also, as in the second embodiment, the valve 44 may be provided on the partitions 20, 60, and 70 in the first, third, and fourth embodiments, and the valve 44 and the movable plate 32 may be connected by a connecting portion 48.

[0101] In the above embodiment, the movable plate 32 is in the shape of a circular ring plate, but this is not necessarily limited to this. The cylindrical walls 23a and 27a may be omitted, and the movable plate 32 may be formed in a circular plate shape. In this case, the grooves 26 and 30 and the valves 34 and 36 may be omitted.

[0102] In the above embodiment, the grooves 25, 29 surrounding all the through holes 24, 28 arranged in the circumferential direction and the grooves 26, 30 surrounded by all the through holes 24, 28 arranged in the circumferential direction are provided, but this is not necessarily limited to this. For example, each of the through holes 24, 28 may be surrounded by an annular groove. Also, the through holes 24, 28 may be divided into a plurality of groups, and each group may be surrounded by an annular groove. In either case, as in the above embodiment, an annular valve may be provided on the movable plate 32 at a position facing the groove along each groove.

[0103] In the above second embodiment, the height of the inner projections 51-54 and the height H of the valves 33-36 are substantially the same as each other. However, this is not necessarily limited to this. For example, the height of the inner projections 51-54 may be greater than the height H of the valves 33-36, or may be smaller than the height H of the valves 33-36.

[0104] It is preferable to set the height of the inner projections 51-54 smaller than the height H of the valves 33-36. In this case, in the first stage of blocking the second orifice, the amount of crushing of the inner projections 51-54 can be reduced before the valves 33-36 come into contact with the first restricting plate 41 or the second restricting plate 42, and the inner projections 51-54 can be brought into contact with the wall surface 23c or the like after the contact. This can shorten the time until the movement of the movable plate 32 is restricted by the first restricting plate 41 or the second restricting plate 42 in the first stage, and can improve the switching sensitivity of the damping characteristics of the liquid-filled vibration-proof device due to the blocking of the second orifice.

[0105] The heights of the inner protrusions 51 and 52 may be different, and the heights of the inner protrusions 53 and 54 may be different. In this case, the timing at which the inner protrusions 51-54 come into contact with the wall surface 23c, etc. is shifted, so that the impact caused by the contact can be mitigated and the generation of abnormal noise can be reduced. Also, the heights of the inner protrusions 51-54 may vary in the circumferential direction. In this case, the contact area between the inner protrusions 51-54 and the wall surface 23c, etc. gradually increases, so that the impact caused by the contact can be mitigated and the generation of abnormal noise can be reduced.

[0106] The inner protrusions 51, 52 are not limited to being formed in a circumferentially continuous ring shape, and may be provided in multiple numbers at intervals in the circumferential direction. However, when the inner protrusions 51, 52 are continuous in the circumferential direction, when the inner protrusions 51, 52 come into contact with the wall surface 23c or the like, the second orifice can be blocked by the contact, and the sealing performance for blocking the second orifice can be improved.

[0107] In the above second embodiment, the inner protrusions 51-54 and the central protrusions 56, 57 protrude from the movable plate 32, but this is not necessarily limited to this. For example, the inner protrusions 51-54 may protrude from the wall surface 23c, etc., and the central protrusions 56, 57 may protrude from the first lattice 23b and the second lattice 27b.

[0108] Furthermore, the height of the central projections 56, 57 may be the same as or greater than the height H of the valves 33-36 and the height of the inner projections 51-54. The heights of the multiple central projections 56, 57 do not necessarily have to be the same, and each of the heights may be different. In this case, the timing at which each of the central projections 56, 57 contacts the movable plate 32 or the first lattice 23b or the second lattice 27b is shifted, so that the impact caused by the contact can be mitigated and the generation of abnormal noise can be reduced.

[0109] All of the multiple central protrusions 56, 57 are not limited to being located at the radial center of the movable plate 32 or the first lattice 23b or the second lattice 27b, and at least some of the central protrusions 56, 57 may be shifted radially outward or inward. By shifting the multiple central protrusions 56, 57 from each other in the radial direction, the timing at which each central protrusion 56, 57 contacts the movable plate 32 or the first lattice 23b or the second lattice 27b is shifted, thereby reducing the generation of abnormal noise due to such contact.

[0110] In the second embodiment, the movable plate 32 and the valve 44 are connected by two connecting portions 48, but this is not necessarily limited to the above. For example, the number of connecting portions 48 may be one or three or more. Furthermore, the mounting groove 27e into which the connecting portion 48 fits is not limited to being provided in the cylindrical wall 27a, but may be provided in the cylindrical wall 23a. The connecting portions 48 may be provided in both the cylindrical walls 23a and 27a. The connecting portion 48, which can be attached to the movable plate 32 or the valve 44 later, may be passed through a hole penetrating the cylindrical walls 23a and 27a, and then the movable plate 32 or the valve 44 and the connecting portion 48 may be connected to each other.

[0111] In the above fourth embodiment, the case where the inner peripheral edge side of the movable plate 32 is sandwiched between the first restricting plate 71 and the second restricting plate 73 has been described, but this is not necessarily limited to this. For example, the outer peripheral edge side of the movable plate 32 may be sandwiched between the first restricting plate 71 and the second restricting plate 73. In this case, as in the first embodiment, the partition body 70 may be configured so that the grooves 26, 30 and the valves 34, 36 face each other. [Explanation of symbols]

[0112] 10. Liquid-filled vibration isolation device 11 First member 12 Second member 13 Anti-vibration base 15 Diaphragm 17 1st liquid chamber 18 2nd liquid chamber 20,40,60,70 Partition 23, 41, 71 First regulating plate (regulating member, regulating plate) 27, 42, 73 Second regulating plate (regulating member, regulating plate) 24,28 Through hole (part of orifice) 25,26,29,30 groove 25a,26a,29a,30a Contact surface 31 Storage space (part of orifice) 32 Movable plate 33, 34, 35, 36 Valves 51,52,53,54 Medial projection 56,57 central projection

Claims

1. 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 formed in the partition and communicating the first liquid chamber with the second liquid chamber; a movable plate that is movable in a moving direction within the orifice by a liquid flow within the orifice; a valve provided on the movable plate and capable of blocking the orifice; the partition body includes a restricting member that restricts movement of the movable plate in the movement direction, A liquid-sealed vibration-damping device characterized in that, when the movement of the movable plate is restricted by the regulating member, the valve deforms in a direction different from the direction of movement and contacts the abutment surface of the partition body, thereby blocking the orifice.

2. the regulating members are a pair of regulating plates provided on both sides of the movable plate in a plate thickness direction, which is the moving direction, One or more through holes constituting a part of the orifice are formed through the regulating plate, and an annular groove surrounding the one or more through holes or surrounded by the plurality of through holes is formed on a surface of the regulating plate facing the movable plate, The valve protrudes from the movable plate in the plate thickness direction and is formed in an annular shape along the groove, With the movement of the movable plate restricted by the restricting plate, at least the tip side of the valve is accommodated in the groove, 2. The hydraulic vibration isolator according to claim 1, wherein the contact surface is a wall surface of the groove on the side of the through hole.

3. 3. The liquid-filled vibration-proof device according to claim 2, wherein an inner protrusion protrudes from one of said regulating plate and said movable plate facing each other between said groove and said through hole toward the other.

4. The through hole is provided in a plurality of the restricting plates, 4. The liquid-filled vibration-proof device according to claim 2, wherein a central projection projects from one of the restricting plate and the movable plate facing each other between the plurality of through holes toward the other.

5. 4. The hydraulic vibration isolating device according to claim 2, wherein a width of the valve, which is a dimension in a direction in which the valve and the contact surface face each other, is smaller than a thickness of the movable plate.

Images