Liquid-filled vibration isolation device

Abstract

To provide a liquid sealed vibration control device capable of easily controlling deformation of a movable plate provided with slits on projections.SOLUTION: A plurality of annular projections (first projection 31a and second projection 31b) are respectively projected from a first surface 30a and a second surface 30b of a disc-like movable plate 30, and the projections are divided in a circumferential direction by slits 41-44. As the projections adjacent to each other in a radial direction are different in positions of the slits 41-44 in the circumferential direction, bending of the movable plate 30 at the slits 41-44 as starting points can be suppressed. Thus, the rigidity in the circumferential direction of the movable plate 30 can be unified even when the slits 41-44 are formed on the projections, so that deformation of the movable plate 30 can be easily controlled to suppress local deformation of a part of the movable plate 30 in the circumferential direction.SELECTED DRAWING: Figure 3

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 in which slits are provided in protrusions to facilitate control of deformation of a movable plate. [Background technology]

[0002] One example of a known vibration-damping device that supports a vibration source such as an engine on a vehicle body (support side) is the hydraulic vibration-damping device disclosed in Patent Document 1. The hydraulic vibration-damping device disclosed in Patent Document 1 has a liquid chamber formed inside that is divided into a first liquid chamber and a second liquid chamber by a partition. The partition includes a first partition plate facing the first liquid chamber, a second partition plate facing the second liquid chamber, and a movable plate made of a disk-shaped elastic body that is disposed between the first partition plate and the second partition plate.

[0003] The first and second partition plates each have a through-hole formed therethrough in the plate thickness direction, whereby the fluid pressure in the first and second fluid chambers is applied to the movable plate via the through-holes, causing the movable plate to deform or displace, thereby consuming the vibration energy input to the liquid-filled vibration damping device.

[0004] Furthermore, in Patent Document 1, a plurality of annular protrusions are protruded from the movable plate in order to suppress abnormal noise when the deformed or displaced movable plate comes into contact with the first partition plate or the second partition plate. Patent Document 1 also describes that the annular protrusions may be interrupted in the circumferential direction to make it easier to deform the movable plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-56398 Summary of the Invention [Problem to be solved by the invention]

[0006] However, Patent Document 1 does not describe the arrangement of slits for discontinuing the annular protrusion, which poses the problem that it is difficult to control the deformation of a movable plate having slits in the protrusion.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a liquid-sealed vibration-damping device that can easily control the deformation of a movable plate having slits in the protrusions. [Means for solving the problem]

[0008] In order to achieve this object, the liquid-filled 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 filled with liquid between the second member and the vibration-damping base, and a partition body separating the liquid chamber into a first liquid chamber and a second liquid chamber, the partition body comprising a first partition plate having a first through-hole formed therethrough in the thickness direction and facing the first liquid chamber, a second partition plate having a second through-hole formed therethrough in the thickness direction and facing the second liquid chamber, and a movable plate made of a circular elastic material having a first surface on the side of the first partition plate and a second surface on the side of the second partition plate, the movable plate having a plurality of annular protrusions protruding from the first surface and the second surface, respectively, surrounding the axis of the movable plate, and each of the plurality of protrusions having a slit formed therein dividing the protrusion in the circumferential direction. In the projections adjacent to each other in the radial direction, the positions of the slits are different in the circumferential direction. The height of the protrusion, which is the dimension in the plate thickness direction, is greater than half the thickness of the protrusion, which is the dimension in the radial direction, and the slit is formed over the entire height of the protrusion. [Effects of the Invention]

[0009] According to the liquid-filled vibration-damping device of claim 1, a plurality of annular protrusions protrude from each of the first surface of the disk-shaped movable plate facing the first partition plate and the second surface of the disk-shaped movable plate facing the second partition plate, and the protrusions are divided in the circumferential direction by slits. Since the slits are positioned differently in the circumferential direction in the radially adjacent protrusions, bending of the movable plate starting from the slits can be suppressed. Therefore, even when slits are provided in the protrusions, the rigidity of the movable plate in the circumferential direction can be made uniform (or made nearly uniform), making it easier to control the deformation of the movable plate so as to suppress localized deformation of a portion of the movable plate in the circumferential direction.

[0010] liquid The sealed-in vibration-damping device includes an orifice that connects the first liquid chamber and the second liquid chamber via the outside of the outer peripheral edge of the movable plate, the first through-hole in the first partition plate, and the second through-hole in the second partition plate. Two or more protrusions are arranged around the entire circumference from the outer peripheral edge of the movable plate toward the inside in the radial direction to the outermost edge of at least one of the first through-hole and the second through-hole. When the movable plate is displaced to press the two or more protrusions against the first or second partition plate to close the orifice, a leakage flow path is formed between the two or more protrusions and through the slits in the closed portion. However, because the positions of the slits in the two or more radially adjacent protrusions are different in the circumferential direction, the leakage flow path can be lengthened, thereby suppressing liquid leakage through the leakage flow path between the first liquid chamber side and the second liquid chamber side.

[0011] Claim 2 According to the described liquid-filled vibration isolation device, A plurality of annular protrusions protrude from each of the first surface of the disk-shaped movable plate facing the first partition plate and the second surface of the disk-shaped movable plate facing the second partition plate, and the protrusions are divided in the circumferential direction by slits. Since the slits are positioned differently in the circumferential direction in the radially adjacent protrusions, bending of the movable plate starting from the slits can be suppressed. Therefore, even when slits are provided in the protrusions, the rigidity of the movable plate in the circumferential direction can be made uniform (or made nearly uniform), making it easier to control the deformation of the movable plate so as to suppress localized deformation of a portion of the movable plate in the circumferential direction. The movable plate has communicating holes formed in the plate thickness direction on the inner circumferential side of the multiple protrusions. The liquid-filled vibration damping device has an orifice that connects the first liquid chamber and the second liquid chamber via the communicating hole, the first through-hole in the first partition plate, and the second through-hole in the second partition plate. Two or more protrusions are arranged around the entire circumference from the edge of the communicating hole radially outward to the innermost edge of at least one of the first through-hole and the second through-hole. When the movable plate is displaced to press the two or more protrusions against the first or second partition plate to close the orifice, a leakage flow path is formed between the two or more protrusions and through the slits in the closed portion. However, because the positions of the slits in the two or more radially adjacent protrusions are different in the circumferential direction, the leakage flow path can be lengthened, and liquid leakage through the leakage flow path between the first liquid chamber side and the second liquid chamber side can be suppressed.

[0012]

[0013] Claim 3 According to the liquid-filled vibration-damping device described in claim 1 or 2 In addition to the effects of the liquid-filled vibration-damping device described in 1, the following effect is achieved: The protrusions include a plurality of first protrusions protruding from the first surface and a plurality of second protrusions protruding from the second surface. Here, if the protrusions (first protrusions and second protrusions) are located in the same position on both surfaces of the movable plate, the rigidity of the movable plate in areas where there are no protrusions will be significantly lower than in areas where there are protrusions, and there is a risk that cracks will easily occur starting from areas where there are no protrusions. In contrast, by having a plurality of second protrusions protrude from the second surface between the plurality of first protrusions, the difference in rigidity of the movable plate due to the first protrusions and the second protrusions can be reduced, making it less likely for cracks to occur in the movable plate and improving the durability of the movable plate.

[0014] Claim 4 According to the liquid-filled vibration-damping device described in claim 3 In addition to the effects of the above-described liquid-filled vibration damping device, the following effect is achieved: The positions of the slits differ in the circumferential direction between the first and second protrusions that are closest to each other. This prevents the rigidity of the movable plate from being locally reduced depending on the position of the slits, making it less likely for cracks to occur starting from those locally low-rigidity areas and improving the durability of the movable plate.

[0015] Claim 5 According to the liquid-filled vibration-damping device described in claim 3 or 4 In addition to the effects of the liquid-filled vibration-damping device described in 1., the following effect is achieved: The region where half the height of the first projections is projected in the thickness direction of the movable plate and the region where half the height of the second projections is projected in the thickness direction of the movable plate are separated in the radial direction. The rigidity of the movable plate can be reduced between these regions, making it easier to deform a portion of the movable plate. For example, it is easier to deform the movable plate in a wavy manner in the radial direction. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view of a liquid-sealed vibration-damping device according to a first embodiment. [Figure 2] FIG. 2 is a partially enlarged cross-sectional view of the liquid-sealed vibration-damping device, enlarging a portion II in FIG. 1. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a partially enlarged cross-sectional view of a liquid-sealed vibration-damping device according to a second embodiment. [Figure 6] FIG. 10 is a partially enlarged cross-sectional view of a liquid-sealed vibration-damping device according to a third embodiment. [Figure 7] FIG. 10 is a plan view of a movable plate of a liquid-sealed vibration-damping device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments will now be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a hydraulic vibration damping device 10 in a first embodiment. FIG. 2 is a partially enlarged cross-sectional view of the hydraulic vibration damping device 10, enlarging part II in FIG. 1. Note that FIG. 1 shows the hydraulic vibration damping device 10 in a state where no vibration (load) is input. Unless otherwise specified, the state where no input is input will be described for each part of the hydraulic vibration damping device 10. Furthermore, in the following description, the upper side of the paper in FIG. 1 will be described as the upper side of the hydraulic vibration damping device 10, but the top and bottom of this hydraulic vibration damping device 10 do not necessarily coincide with the top and bottom of the vehicle to which the hydraulic vibration damping device 10 is attached.

[0018] The hydraulic vibration damping device 10 is an engine mount that elastically supports an automobile engine. The hydraulic vibration damping device 10 mainly comprises a first member 11 that is attached to the engine side, which is the vibration source, a cylindrical second member 12 that is attached to the vehicle body on the support side, and a vibration-damping base 13 made up of an elastic body that connects the first member 11 and the second member 12. The cross-sectional view of the hydraulic vibration damping device 10 in Figure 1 is an axial cross-sectional view that includes the axis C of the cylindrical second member 12.

[0019] 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 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.

[0020] The second member 12 is a cylindrical member centered on the axis C, and is made primarily of metal such as steel. The second member 12 includes a large diameter portion 12a at the upper end, a reduced diameter portion 12b that connects to the lower end of the large diameter portion 12a and has gradually smaller inner and outer diameters going downward, and a small diameter portion 12c that connects 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.

[0021] The vibration-isolating base 13 is a generally umbrella-shaped member made of an elastic material such as rubber or thermoplastic elastomer. The vibration-isolating base 13 is vulcanization-bonded to the lower part of the first member 11 and to the inner circumferential surfaces of the large-diameter portion 12a and the reduced-diameter portion 12b, connecting them together. A rubber membrane-like film portion 14 that covers the inner circumferential surface of the small-diameter portion 12c is continuous with the lower end of the vibration-isolating base 13. This film portion 14 is a part of the second member 12.

[0022] 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 all around.

[0023] 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 member 20 into a first liquid chamber 17, whose wall is made up of the vibration-isolating base 13, and a second liquid chamber 18, whose wall is made up of the diaphragm 15.

[0024] 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 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 peripheries of the partition body 20 and the mounting portion 16 are held by the membrane portion 14. In this way, the diaphragm 15 and the partition body 20 are attached to the second member 12.

[0025] The partition body 20 includes a cylindrical member 21 held inside the membrane portion 14, flat first and second partition plates 23 and 26 that separate the inner circumferential side of the cylindrical member 21 into upper and lower sections, and a movable plate 30 disposed between the first and second partition plates 23 and 26. The first partition plate 23 facing the first liquid chamber 17 and the second partition plate 26 facing the second liquid chamber 18 are stacked one on top of the other and joined by welding, bonding, or press-fitting.

[0026] 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. A circumferential 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 this circumferential groove 22 and the membrane portion 14.

[0027] One end of the outer circumferential groove 22 opens to the upper end of the cylindrical member 21 radially inward from the step 13a, so that the first orifice 19 communicates with the first liquid chamber 17. The other end of the outer circumferential groove 22 opens to the lower end of the cylindrical member 21 radially inward from the contact position with the diaphragm 15, so that the first orifice 19 communicates with the second liquid chamber 18.

[0028] In this way, the first orifice 19 is a flow path that communicates the first fluid chamber 17 and the second fluid chamber 18. In order to attenuate shake vibrations, for example, when the vehicle is running, the first orifice 19 has a flow path cross-sectional area, length, cross-sectional circumference, etc. that are set so that the damping coefficient is large in a frequency band corresponding to the shake vibrations (for example, about 5 to 15 Hz) when large amplitude shake vibrations are input.

[0029] The first partition plate 23 is made of metal or synthetic resin and is formed in a disk shape perpendicular to the axis C. A cylindrical base portion 24 centered on the axis C protrudes downward (toward the second partition plate 26) from the radial center of the first partition plate 23. A plurality of first through holes 25 are formed in the first partition plate 23 radially outward of the base portion 24 and penetrate the first partition plate 23 in the plate thickness direction.

[0030] A cylindrical portion 23a extends upward from the outer peripheral edge of the first partition plate 23, and a flange 23b extends radially outward from the upper edge of the cylindrical portion 23a. The first partition plate 23 is attached to the cylindrical member 21 by fitting the cylindrical portion 23a onto the inner peripheral side of the cylindrical member 21 until the flange 23b contacts the upper end of the cylindrical member 21. The flange 23b, which has contacted the upper end of the cylindrical member 21, contacts the step 13a of the vibration-damping base 13. In addition, portions of the cylindrical portion 23a and the flange 23b in the circumferential direction are omitted so as not to block the opening of the outer peripheral groove 22 on the first liquid chamber 17 side.

[0031] The second partition plate 26 is a part that is molded integrally with the tubular member 21, and is formed in a circular plate shape that is perpendicular to the axis C. The outer peripheral edge of the second partition plate 26 is connected to the inner peripheral surface of the tubular member 21 along the entire circumference, and an accommodation space 29 is formed between the first partition plate 23 and the second partition plate 26 that are attached to the tubular member 21.

[0032] A substantially cylindrical protrusion 27, centered on the axis C, protrudes upward (toward the first partition plate 23) from the radial center of the second partition plate 26, at a position facing the base 24. The outer peripheral surface of the protrusion 27 includes a cylindrical surface 27a having a constant outer diameter centered on the axis C, and an inclined outer surface 27b that connects the upper end of the cylindrical surface 27a to the tip of the protrusion 27 and inclines radially inward toward the tip (toward the first partition plate 23). The outer diameter of the cylindrical surface 27a is smaller than the outer diameter of the base 24. The inclined outer surface 27b is a conical surface whose diameter decreases toward the tip of the protrusion 27, and its cross section including the axis C is linear.

[0033] A plurality of second through holes 28 are formed in the second partition plate 26 so as to penetrate in the plate thickness direction, radially outward from the protruding portion 27. The second through holes 28 are basically set to have a shape, size, and position symmetrical to (mirrored) the first through holes 25 of the first partition plate 23.

[0034] The movable plate 30 is a member made of an elastic body such as rubber or thermoplastic elastomer, and is formed in a disk shape perpendicular to the axis C. The movable plate 30 is disposed in the accommodation space 29 between the first partition plate 23 and the second partition plate 26.

[0035] The fluid pressure of the first fluid chamber 17 and the second fluid chamber 18 is applied to the movable plate 30 in the accommodation space 29 via the first through-hole 25 and the second through-hole 28 formed in the first partition plate 23 and the second partition plate 26, respectively. When the movable plate 30 is deformed or displaced by this fluid pressure, the vibration energy input to the fluid-filled vibration-damping device 10 is consumed, and the vibration can be damped by the fluid-filled vibration-damping device 10.

[0036] The movable plate 30 has a plurality of first protrusions 31a protruding from a first surface 30a facing the first partition plate 23, a plurality of second protrusions 31b protruding from a second surface 30b facing the second partition plate 26, a communicating hole 32 penetrating the radial center of the movable plate 30 in the plate thickness direction (direction of the axis C), a plurality of first side protrusions 35 protruding from the first surface 30a inside the plurality of first protrusions 31a, and a plurality of second side protrusions 36 protruding from the second surface 30b inside the plurality of second protrusions 31b.

[0037] The dimension of the accommodation space 29 in the direction of the axis C is larger than the overall thickness of the movable plate 30 (the distance in the direction of the axis C from the tip of the first protrusion 31a to the tip of the second protrusion 31b). Furthermore, the inner diameter of the accommodation space 29 is larger than the outer diameter of the movable plate 30. Therefore, when the movable plate 30 is positioned in the center of the accommodation space 29, a second orifice that communicates between the first liquid chamber 17 and the second liquid chamber 18 is formed by the gap between the wall surface of the accommodation space 29 and the movable plate 30, the first through hole 25, and the second through hole 28.

[0038] The flow path cross-sectional area, length, cross-sectional circumference, etc. of this second orifice are set so that the damping coefficient becomes large in a frequency band corresponding to idle vibration (for example, about 15 to 50 Hz) when small amplitude idle vibration is input, in order to reduce idle vibration, for example, when the vehicle is idling (when stopped).

[0039] The communication hole 32 is formed in a circular shape centered on the axis C in a plan view. A short-circuit path that short-circuits the second orifice is formed by this communication hole 32. However, this short-circuit path is switched between a blocked state and a communicating state by a negative pressure relief valve described below.

[0040] The inner peripheral surface of the communicating hole 32 has inclined inner surfaces 33, 34 that incline radially inward toward the center in the plate thickness direction. The inclined inner surface 33 is a conical surface whose diameter decreases downward and is located on the upper side of the communicating hole 32. The inclined inner surface 34 is a conical surface whose diameter decreases upward and is located on the lower side of the communicating hole 32.

[0041] The inclined inner surface 34 is in surface contact over the entire periphery with the inclined outer surface 27b of the protruding portion 27. While this surface contact is maintained, the communication hole 32 is blocked by the protruding portion 27, and the short-circuit path is cut off.

[0042] The inclined inner surfaces 33, 34 are formed symmetrically at their boundary surfaces, so that even when the movable plate 30 is turned upside down, the inclined inner surface 33 comes into surface contact with the inclined outer surface 27b of the protrusion 27 over the entire periphery. Therefore, when the movable plate 30 is disposed between the first partition plate 23 and the second partition plate 26, it is not necessary to check the front and back of the movable plate 30.

[0043] The multiple first side protrusions 35 are portions that protrude from the first surface 30a around the communicating holes 32 toward the first partition plate 23. The multiple second side protrusions 36 are portions that protrude from the second surface 30b around the communicating holes 32 toward the second partition plate 26.

[0044] The multiple first side protrusions 35 and second side protrusions 36 are arranged at intervals in the circumferential direction along the edge of the communicating hole 32. In this embodiment, the first side protrusions 35 and second side protrusions 36 are arranged in groups of four at equal intervals on all four sides of the communicating hole 32 (see FIGS. 3 and 4). The multiple first side protrusions 35 and second side protrusions 36 all have the same height, which is lower than the height of the first protrusions 31a and second protrusions 31b.

[0045] The multiple first side protrusions 35 contact the tip surface of the base portion 24 of the first partition plate 23 with the inclined inner surface 34 of the communicating hole 32 and the inclined outer surface 27b of the protrusion 27 in surface contact. In this contact state and when no vibration is input, the first side protrusions 35 are slightly pre-compressed (for example, by about 0.2 mm). Because the multiple first side protrusions 35, which are arranged at intervals in the circumferential direction, contact the base portion 24, the base portion 24 and the movable plate 30 are separated in part of the circumferential direction, and the communicating holes 32 can easily communicate with the first through-holes 25 around the base portion 24.

[0046] Furthermore, when vibrations that do not release the pre-compression of the first-side convex portions 35 are input to the hydraulic vibration damping device 10, or when no vibrations are input at all, the first-side convex portions 35 maintain surface contact between the inclined inner surface 34 and the inclined outer surface 27b. That is, the movable plate 30 is sandwiched between the base portion 24 and the inclined outer surface 27b of the protruding portion 27, and the state in which the communication hole 32 is blocked by the protruding portion 27 can be maintained. Furthermore, maintaining surface contact by the first-side convex portions 35 makes it easier to position the movable plate 30 relative to the protruding portion 27 in the direction of the axis C, and the movable plate 30 can be positioned in the center of the accommodation space 29 in the direction of the axis C.

[0047] Furthermore, since the inclined inner surface 34 and the inclined outer surface 27b, which come into surface contact, are both conical surfaces centered on the axis C and are similarly inclined relative to each other, it is easy to position the movable plate 30 radially relative to the protrusion 27, and the movable plate 30 can be positioned radially in the center within the storage space 29.

[0048] Due to these positioning arrangements, when the vibration (load) input from the vibration source to the liquid-filled vibration damping device 10 via the first member 11 is small, it is possible to maintain a communication state of the gap between the wall surface of the accommodation space 29 and the movable plate 30, and the second orifice through the first through-hole 25 and the second through-hole 28. On the other hand, when the vibration input to the liquid-filled vibration damping device 10 becomes large and the movable plate 30 comes into contact with the first partition plate 23 or the second partition plate 26, the second orifice enters a blocked state, and the damping characteristics of the first orifice 19 are mainly exerted.

[0049] The multiple second side protrusions 36 contact the cylindrical surface 27a of the protrusion 27 with the inclined inner surface 34 and the inclined outer surface 27b in surface contact. As a result, radial movement of the movable plate 30 relative to the protrusion 27 is restricted not only by the surface contact between the inclined inner surface 34 and the inclined outer surface 27b but also by the contact between the multiple second side protrusions 36 and the protrusion 27, and the movable plate 30 can be positioned radially relative to the protrusion 27.

[0050] The multiple first side protrusions 35 are located on the opposite side of the portion where the multiple second side protrusions 36 are lined up in the circumferential direction. In this embodiment, the second side protrusions 36 are located on the opposite side of each first side protrusion 35. This allows the movable plate 30 to be turned over, with the first side protrusions 35 serving as second side protrusions and the second side protrusions 36 serving as first side protrusions, and still allow the respective protrusions to function. Therefore, when placing the movable plate 30 between the first partition plate 23 and the second partition plate 26, it is not necessary to check the front and back of the movable plate 30.

[0051] When a large load (large amplitude vibration) is input to the liquid-sealed vibration damping device 10 and the first liquid chamber 17 becomes excessively negatively pressurized, the movable plate 30 is displaced toward the first partition plate 23, the first protrusion 31a and the first side convex portion 35 are crushed, and the inclined outer surface 27b of the protrusion 27 and the inclined inner surface 34 of the communicating hole 32 are separated.

[0052] As a result, the communication hole 32 communicates not only with the first through-hole 25 but also with the second through-hole 28 around the protrusion 27. As a result, the short-circuit path is connected, allowing the liquid to quickly flow from the second liquid chamber 18 to the first liquid chamber 17, making it less likely that cavitation will occur due to negative pressure in the first liquid chamber 17.

[0053] When the first fluid chamber 17 is under positive pressure, the inclined inner surface 34 is pressed against the inclined outer surface 27b, just as when no load is applied, so the short-circuit path is maintained in a blocked state. When the fluid pressure in the first fluid chamber 17 is negative and low, the inclined inner surface 34 is pressed against the inclined outer surface 27b in accordance with the amount of pre-compression of the first side convex portion 35, so the short-circuit path is maintained in a blocked state. In other words, the level of fluid pressure that opens the short-circuit path can be adjusted by adjusting the amount of pre-compression of the first side convex portion 35.

[0054] A mechanism that opens the short-circuit path when the first fluid chamber 17 is under excessive negative pressure and closes the short-circuit path in other cases is called a negative pressure relief valve. In this embodiment, the negative pressure relief valve is mainly formed by the movable plate 30 and the protrusion 27.

[0055] As described above, the movement of the movable plate 30 in the radial direction and in the direction of the axis C relative to the protruding portion 27 can be regulated by the contact between the inclined outer surface 27b and the inclined inner surface 34, the contact between the base portion 24 and the first side convex portion 35, and the contact between the cylindrical surface 27a and the second side convex portion 36. Therefore, since there is no need to sandwich the outer periphery of the movable plate 30 between the first partition plate 23 and the second partition plate 26 to position the movable plate 30 relative to the protruding portion 27, the negative pressure relief valve can be made more compact than one that has such a sandwiching portion.

[0056] Furthermore, to eliminate the need to position the movable plate 30 or check the front and back of the movable plate 30, second side protrusions 36 are arranged around the communication hole 32 and around the inlet of the shunt path on the second liquid chamber 18 side. However, because these second side protrusions 36 are arranged at intervals in the circumferential direction, it is difficult for the second side protrusions 36 to block the inlet of the shunt path on the second liquid chamber 18 side. Therefore, even when the second side protrusions 36 are provided, the liquid in the shunt path that is in a connected state by the negative pressure relief valve can flow smoothly, making it easier to quickly release the negative pressure in the first liquid chamber 17.

[0057] In a cross section including the axis C, the inclined outer surface 27b and the inclined inner surface 34 are formed linearly, so that when the negative pressure relief valve is opened, the short-circuit path between them can be made linear. This allows for smooth liquid flow in the short-circuit path that is connected by the negative pressure relief valve, making it easier to quickly release the negative pressure in the first liquid chamber 17.

[0058] The first protrusions 31a and the second protrusions 31b are portions for suppressing abnormal noise when the deformed (displaced) movable plate 30 comes into contact with the first partition plate 23 or the second partition plate 26. The multiple first protrusions 31a and second protrusions 31b are annular portions arranged on concentric circles centered on the axis C, and are all formed to have the same height to their tips (dimension in the direction of the axis C).

[0059] The communicating hole 32, the first side protrusion 35, and the second side protrusion 36 are located radially inward of the radially innermost first protrusion 31a and second protrusion 31b, and the innermost edges (the outer surfaces of the base portion 24 and the protrusion portion 27) of the multiple first through holes 25 and second through holes 28 are located.

[0060] The height of the first protrusions 31a and the second protrusions 31b is preferably equal to or greater than the thickness (dimension in the direction of the axis C) of the movable plate 30 excluding the first protrusions 31a and the second protrusions 31b. This ensures a sufficient amount of deformation of the first protrusions 31a and the second protrusions 31b when they come into contact with the first partition plate 23 or the second partition plate 26, making it easier to suppress abnormal noise during such contact.

[0061] Furthermore, the thickness (radial dimension) of the first protrusions 31a and the second protrusions 31b is preferably equal to or less than half the height of the first protrusions 31a and the second protrusions 31b, which makes it easier to deform the first protrusions 31a and the second protrusions 31b when they come into contact with the first partition plate 23 or the second partition plate 26, and makes it easier to suppress abnormal noises at the time of such contact.

[0062] The multiple first protrusions 31a and second protrusions 31b are arranged alternately on both the upper and lower surfaces. That is, the multiple second protrusions 31b protrude from the second surface 30b between the multiple first protrusions 31a, and the multiple first protrusions 31a protrude from the first surface 30a between the multiple second protrusions 31b.

[0063] If the first protrusions 31a and the second protrusions 31b are located in the same positions on both the upper and lower surfaces of the movable plate 30, the rigidity of the movable plate 30 in the portions where the first protrusions 31a and the second protrusions 31b are not present will be significantly lower than that in the portions where the first protrusions 31a and the second protrusions 31b are present. This may make it easier for cracks to occur starting from the portions where the first protrusions 31a and the second protrusions 31b are not present.

[0064] In contrast, by arranging the multiple first protrusions 31a and second protrusions 31b alternately on both the upper and lower surfaces, it is possible to reduce the difference in rigidity of the movable plate 30 due to the first protrusions 31a and the second protrusions 31b. As a result, it is possible to make the movable plate 30 less susceptible to cracks and improve the durability of the movable plate 30.

[0065] The thickness of each of the multiple first protrusions 31a and second protrusions 31b decreases toward the tip. A region E1, where half the height of the first protrusions 31a is projected in the thickness direction of the movable plate 30, and a region E2, where half the height of the second protrusions 31b is projected in the thickness direction of the movable plate 30, are separated in the radial direction. This reduces the difference in rigidity of the movable plate 30 due to the first protrusions 31a and the second protrusions 31b, while lowering the rigidity of the movable plate 30 between the regions E1 and E2, making it easier to deform a portion of the movable plate 30. For example, it makes it easier to deform the movable plate 30 in a radially wavy manner.

[0066] 3 is a plan view of the movable plate 30. A plurality of slits 41, 42 that divide the first protrusion 31a in the circumferential direction are formed in the first protrusion 31a of the movable plate 30. The slits 41, 42 are formed from the tip of the first protrusion 31a to the first surface 30a.

[0067] 4 is a bottom view of the movable plate 30. A plurality of slits 43, 44 that divide the second protrusion 31b in the circumferential direction are formed in the second protrusion 31b of the movable plate 30. The slits 43, 44 are formed from the tip of the second protrusion 31b to the second surface 30b.

[0068] 3 and 4, when the first protrusions 31a and the second protrusions 31b are separated by the slits 41-44, the movable plate 30 can be more easily deformed than when the first protrusions 31a and the second protrusions 31b are continuous around the entire circumference. Furthermore, the slits 41-44 can also make the first protrusions 31a and the second protrusions 31b themselves more easily deformed. As a result, the damping effect of vibrations due to deformation of the movable plate 30 and deformation of the first protrusions 31a and the second protrusions 31b themselves can be improved.

[0069] The slit 41 is provided in the odd-numbered first protrusions 31a from the radial center among the multiple first protrusions 31a. The slit 42 is provided in the even-numbered first protrusions 31a from the radial center among the multiple first protrusions 31a. That is, the positions of the slits 41 and 42 in the radially adjacent first protrusions 31a are different in the circumferential direction.

[0070] Similarly, the slit 43 is provided in the odd-numbered second protrusion 31b from the radial center among the multiple second protrusions 31b. The slit 44 is provided in the even-numbered second protrusion 31b from the radial center among the multiple second protrusions 31b. That is, the positions of the slits 43 and 44 in the radially adjacent second protrusions 31b are different in the circumferential direction.

[0071] As a result, compared to when both the slits 41 and 42 or both the slits 43 and 44 are aligned in a straight line, it is possible to prevent the movable plate 30 from bending at the slits 41 to 44. Therefore, even when the slits 41 to 44 are provided in the first protrusion 31a and the second protrusion 31b, the rigidity of the movable plate 30 in the circumferential direction can be made uniform (close to uniform), making it easier to control the deformation of the movable plate 30 so as to prevent local deformation of a part of the movable plate 30 in the circumferential direction.

[0072] 3, the line extending perpendicularly from the axis C upward on the paper is set to 0°, and the angle increases clockwise from the axis C. In FIG. 4, the angle increases counterclockwise from the axis C.

[0073] Slits 41 are positioned at 0°, 90°, 180°, and 270°, slits 42 are positioned at 45°, 135°, 225°, and 315°, slits 43 are positioned at 67.5°, 157.5°, 247.5°, and 337.5°, and slits 44 are positioned at 22.5°, 112.5°, 202.5°, and 292.5°.

[0074] In this way, the positions of the slits 41 to 44 differ in the circumferential direction between the first protrusion 31a and the second protrusion 31b that are closest to each other. This makes it possible to prevent the rigidity of the movable plate 30 from being locally reduced depending on the positions of the slits 41 to 44, compared to when the slits 41 and 43, the slits 41 and 44, the slits 42 and 43, or the slits 42 and 44 are aligned in a straight line. This makes it less likely for cracks to occur starting from those locally low-rigidity portions, thereby improving the durability of the movable plate 30.

[0075] Furthermore, the slits 41 to 44 are arranged so as to divide each of the first protrusions 31a and the second protrusions 31b equally in the circumferential direction (into four in this embodiment), which makes it possible to make the rigidity in the circumferential direction of the movable plate 30, in which the slits 41 to 44 are provided in the first protrusions 31a and the second protrusions 31b, more uniform.

[0076] Furthermore, slit 42 is located at the circumferential center of adjacent slits 41, in other words, slit 41 is located at the circumferential center of adjacent slits 42. Similarly, slit 44 is located at the circumferential center of adjacent slits 43, in other words, slit 43 is located at the circumferential center of adjacent slits 44. In this way, since the slits 41 to 44 are arranged periodically (at 45° intervals) on each of the first surface 30a and the second surface 30b, the rigidity of the movable plate 30 in the circumferential direction can be made more uniform.

[0077] In addition, the slits 43 and 44 are located in the circumferential center between the slits 41 and 42. In other words, the slits 41 and 42 are located in the circumferential center between the slits 43 and 44. In this way, the slits 41 to 44 are arranged periodically (at a period of 22.5°) on both the upper and lower surfaces (the first surface 30a and the second surface 30b) of the movable plate 30, so that the rigidity of the movable plate 30 in the circumferential direction can be made more uniform.

[0078] As shown in Figure 2, the second orifice connecting the first liquid chamber 17 and the second liquid chamber 18 is formed by the first through hole 25, the second through hole 28, the gap between the first partition plate 23 and the first surface 30a and the first protrusion 31a, the gap between the second partition plate 26 and the second surface 30b and the second protrusion 31b, and the outside of the outer peripheral edge of the movable plate 30.

[0079] Two or more (two in this embodiment) first protrusions 31a are arranged around the entire circumference from the outer peripheral edge of the movable plate 30 toward the inside in the radial direction to the outermost edge of the first through holes 25 (the outermost radial edge among the edges of the multiple first through holes 25). Therefore, when the movable plate 30 is displaced upward to press the two or more first protrusions 31a against the first partition plate 23 to close the second orifice, a leakage flow path is formed in the portion that is about to be closed by the spaces between the two or more first protrusions 31a and the slits 41, 42 of the first protrusions 31a.

[0080] However, since the positions of the slits 41 and slits 42 of the two or more radially adjacent first protrusions 31a differ in the circumferential direction, the leakage flow path can be lengthened, and liquid leakage through the leakage flow path can be suppressed between the first liquid chamber 17 side and the second liquid chamber 18 side. Furthermore, since the slit 42 is located in the center of the circumferentially adjacent slits 41, the leakage flow path can be lengthened, and liquid leakage through the leakage flow path can be further suppressed.

[0081] Furthermore, one second protrusion 31b is disposed along the entire circumference from the outer peripheral edge of the movable plate 30 toward the radially inward direction to the outermost edge of the second through-hole 28 (the radially outermost edge of the edges of the multiple second through-holes 28). Therefore, when the movable plate 30 is displaced downward to press the one second protrusion 31b against the second partition plate 26 to close the second orifice, the slit 44 of the one second protrusion 31b forms a leakage flow path in the portion that is about to be closed. However, because the slit 44 is provided only on a portion of the circumferential direction of the second protrusion 31b, liquid leakage via the leakage flow path between the first liquid chamber 17 side and the second liquid chamber 18 side can be suppressed.

[0082] The width (circumferential dimension) of the slits 41 to 44 is smaller than the distance between radially adjacent first protrusions 31a and the distance between radially adjacent second protrusions 31b. Therefore, even if a leakage flow path is formed through the slits 41 to 44, the leakage flow path can be made narrower, and liquid leakage through the leakage flow path can be suppressed. Furthermore, the width of the slits 41 to 44 is preferably 1.5 to 2.5 mm, and more preferably 2 mm. This allows the leakage flow path to be made narrower, and liquid leakage through the leakage flow path can be further suppressed.

[0083] Next, a second embodiment will be described with reference to Fig. 5. In the first embodiment, a case where a negative pressure relief valve is provided in the partition body 20 is described, but in the second embodiment, a case where a negative pressure relief valve is not provided in the partition body 51 is described. Note that the same parts as in the first embodiment are given the same reference numerals, and the following description will be omitted.

[0084] 5 is a partially enlarged cross-sectional view of a liquid-filled vibration damping device 50 according to the second embodiment. The partition body 51 of the liquid-filled vibration damping device 50 includes a cylindrical member 21, flat first and second partition plates 52 and 55 that separate the inner periphery of the cylindrical member 21 into upper and lower sections, and a movable plate 58 disposed between the first and second partition plates 52 and 55. The first partition plate 52 facing the first liquid chamber 17 and the second partition plate 55 facing the second liquid chamber 18 are stacked one on top of the other and joined by welding, adhesive bonding, or press-fitting.

[0085] The first partition plate 52 is made of metal or synthetic resin and is formed in a circular plate shape perpendicular to the axis C. The first partition plate 52 includes a cylindrical portion 23a, a flange 23b, a column portion 53 protruding downward from the center in the radial direction, and a plurality of first through holes 54 formed to penetrate the plate in the plate thickness direction.

[0086] The pillar portion 53 is a cylindrical portion centered on the axis C. The plurality of first through holes 54 are located radially outward of the pillar portion 53 and are arranged at intervals in the circumferential direction.

[0087] The second partition plate 55 is a part that is molded integrally with the tubular member 21, and is formed in a circular plate shape that is perpendicular to the axis C. The outer peripheral edge of the second partition plate 55 is connected to the inner peripheral surface of the tubular member 21 along the entire circumference, and an accommodation space 29 is formed between the first partition plate 52 attached to the tubular member 21 and the second partition plate 55.

[0088] A pillar portion 56 protrudes upward from the radial center of the second partition plate 55. The pillar portion 56 is a cylindrical portion centered on the axis C. The tips of the pillar portions 53, 56 come into contact with each other, forming the accommodation space 29 in an annular shape.

[0089] A plurality of second through holes 57 are formed in the second partition plate 55 in the plate thickness direction, radially outward of the column portions 56. The second through holes 57 have shapes, dimensions, and positions that are set symmetrical (mirrored) to the first through holes 54 of the first partition plate 52.

[0090] The movable plate 58 is a plate-like member made of an elastic material such as rubber or thermoplastic elastomer, and is formed perpendicular to the axis C. Furthermore, a communication hole 59 is provided in the center of the movable plate 58 in the radial direction, so that the movable plate 58 is formed into a circular plate shape.

[0091] The pillars 53, 56 pass along the inner periphery of the communication hole 59, and the movable plate 58 is disposed in the annular housing space 29. The liquid pressure of the first liquid chamber 17 and the second liquid chamber 18 is applied to the movable plate 58 via the first through-hole 54 and the second through-hole 57, and the vibration energy input to the liquid-sealed vibration-damping device 50 is consumed by the deformation and displacement of the movable plate 58.

[0092] The movable plate 58 has a plurality of first protrusions 31a protruding from a first surface 30a facing the first partition plate 52, and a plurality of second protrusions 31b protruding from a second surface 30b facing the second partition plate 55. The first protrusions 31a and the second protrusions 31b have slits 41 to 44 formed therein, which are the same as those in the first embodiment.

[0093] As in the first embodiment, this partition body 51 has a second orifice connecting the first liquid chamber 17 and the second liquid chamber 18 formed by the first through hole 54, the second through hole 57, between the first partition plate 52 and the first surface 30a and the first protrusion 31a, between the second partition plate 55 and the second surface 30b and the second protrusion 31b, and outside the outer peripheral edge of the movable plate 58.

[0094] Furthermore, since the inner diameter of the communication hole 59 in this embodiment is larger than the outer diameter of the column portions 53, 56, a second orifice connecting the first liquid chamber 17 and the second liquid chamber 18 is formed even through the communication hole 59 instead of the outside of the outer peripheral edge of the movable plate 58.

[0095] Two or more (two in this embodiment) second protrusions 31b are arranged around the entire circumference from the edge of the communication hole 59 toward the radially outward direction to the innermost edge of the second through hole 57 (the radially innermost edge of the edges of the multiple second through holes 57). Therefore, when the movable plate 58 is displaced downward to press the two or more second protrusions 31b against the second partition plate 55 to close the second orifice, a leakage flow path is formed in the portion that is about to be closed by the spaces between the two or more second protrusions 31b and the slits 43, 44 of the second protrusions 31b.

[0096] However, since the positions of the slits 43 and 44 of the two or more radially adjacent second protrusions 31b are different in the circumferential direction, the leakage flow path can be made longer, and liquid leakage through the leakage flow path between the first liquid chamber 17 side and the second liquid chamber 18 side can be suppressed.

[0097] Furthermore, one first protrusion 31a is disposed around the entire circumference from the edge of the communication hole 59 toward the radially outward direction to the innermost edge of the first through-hole 54 (the radially innermost edge of the edges of the multiple first through-holes 54). Therefore, when the movable plate 58 is displaced upward to press the one first protrusion 31a against the first partition plate 52 to close the second orifice, the slit 41 of the one first protrusion 31a forms a leakage flow path in the portion that is about to be closed. However, because the slit 41 is provided only on a portion of the circumferential direction of the first protrusion 31a, liquid leakage via the leakage flow path between the first liquid chamber 17 side and the second liquid chamber 18 side can be suppressed.

[0098] When the movable plate 58 is displaced upward, the first first protrusion 31a is pressed against the first partition plate 52 over the entire circumference, inside the innermost edge of the first through hole 54, and the second first protrusion 31a is pressed against the first partition plate 52 over the entire circumference, outside the outermost edge of the first through hole 54. On the other hand, when the movable plate 58 is displaced downward, the second second protrusion 31b is pressed against the second partition plate 55 over the entire circumference, inside the innermost edge of the second through hole 57, and the first second protrusion 31b is pressed against the second partition plate 55 over the entire circumference, outside the outermost edge of the second through hole 57.

[0099] In this way, regardless of whether the movable plate 58 is displaced upward or downward, the number of first protrusions 31a pressed against the first partition plate 52 over the entire circumference can be made the same as the number of second protrusions 31b pressed against the second partition plate 55 over the entire circumference. As a result, the way in which the movable plate 58 is deformed so as to be drawn into the first through-hole 54 and the way in which the movable plate 58 is deformed so as to be drawn into the second through-hole 57 can be made the same.

[0100] Next, a third embodiment will be described with reference to Fig. 6. In the third embodiment, a case will be described in which two or more first protrusions 31a are pressed against the first partition plate 52 on both radial sides of the first through hole 62, and two or more second protrusions 31b are pressed against the second partition plate 55 on both radial sides of the second through hole 64. Note that the same parts as in the first and second embodiments are given the same reference numerals, and the following description will be omitted.

[0101] 6 is a partially enlarged cross-sectional view of a liquid-sealed vibration-damping device 60 according to the third embodiment. In the partition body 61 of the liquid-sealed vibration-damping device 60, a plurality of first through-holes 62 formed through the first partition plate 52 and a plurality of second through-holes 64 formed through the second partition plate 55 are arranged asymmetrically (non-mirrored).

[0102] The outermost edge of the first through hole 62 is located radially outward from the outermost edge of the second through hole 64. The innermost edge of the first through hole 62 is located radially outward from the innermost edge of the second through hole 64. In this way, it is easier to make the opening area of ​​the first through hole 62 located radially outward larger than that of the second through hole 64 located radially inward. This difference in opening area makes it possible to change the damping characteristics between when the liquid passes through the second orifice (the first through hole 62 and the second through hole 64) from the first liquid chamber 17 to the second liquid chamber 18 and when the liquid passes from the second liquid chamber 18 to the first liquid chamber 17.

[0103] Furthermore, the movable plate 58 has the same number of second protrusions 31b arranged radially inward and staggered relative to the multiple first protrusions 31a. This allows two or more (two in this embodiment) first protrusions 31a to be arranged around the entire circumference from the outer circumferential edge of the movable plate 58 toward the inside in the radial direction to the outermost edge of the first through hole 62, and two or more (two in this embodiment) second protrusions 31b to be arranged around the entire circumference to the outermost edge of the second through hole 64.

[0104] Similarly, two or more (two in this embodiment) first protrusions 31a can be arranged around the entire circumference from the edge of the communicating hole 59 radially outward to the innermost edge of the first through hole 62, and two or more (two in this embodiment) second protrusions 31b can be arranged around the entire circumference to the innermost edge of the second through hole 64.

[0105] As a result, regardless of whether the movable plate 58 is displaced upward or downward, leakage flow paths can be formed on both radial sides by the circumferentially offset slits 41 to 44, and the leakage flow paths on both radial sides can be lengthened. As a result, liquid leakage through the leakage flow paths between the first liquid chamber 17 side and the second liquid chamber 18 side can be further suppressed.

[0106] Note that the movable plate 58 may be reversed, with the first protrusions 31a serving as second protrusions and the second protrusions 31b serving as first protrusions. In this case, when the movable plate 58 is displaced upward, one first protrusion (31b) is pressed against the first partition plate 52 on each radial side of the first through-hole 62. Furthermore, when the movable plate 58 is displaced downward, one second protrusion (31a) is pressed against the second partition plate 55 on each radial side of the second through-hole 64. This makes it possible to shorten the leakage flow path compared to before the movable plate 58 is reversed, making it easier for liquid to flow through the leakage flow path between the first liquid chamber 17 side and the second liquid chamber 18 side.

[0107] Next, a fourth embodiment will be described with reference to Fig. 7. In the fourth embodiment, the positions of the slits 71, 72 in the first protrusions 31a and the second protrusions 31b that are adjacent in the radial direction are the same in the circumferential direction. Note that the same parts as those in the first to third embodiments are given the same reference numerals, and the following description will be omitted.

[0108] 7 is a plan view of a movable plate 70 of a hydraulic vibration damping device according to the fourth embodiment. The movable plate 70 is formed in the same manner as the movable plate 30 of the first embodiment, except for the positions of the slits 71 and 72.

[0109] The multiple slits 71 formed in the first protrusions 31a of the movable plate 70 divide all of the first protrusions 31a in the circumferential direction at the positions of 0°, 90°, 180°, and 270°. In this way, the positions of the slits 71 are the same in the circumferential direction on the first protrusions 31a adjacent in the radial direction. In other words, the slits 71 are aligned in a straight line. This makes it easier to control the deformation of the movable plate 70 so that it bends starting from the slits 71.

[0110] Furthermore, the multiple slits 72 formed in the second protrusions 31b of the movable plate 70 (see FIG. 4) divide all of the second protrusions 31b in the circumferential direction at positions of 45°, 135°, 225°, and 315°. Similar to the slits 71, the positions of the slits 72 are the same in the circumferential direction in the second protrusions 31b adjacent in the radial direction, making it easier to control the deformation of the movable plate 70 so that it bends starting from the slits 72.

[0111] However, since the positions of the slits 71, 72 differ in the circumferential direction between the first protrusion 31a and the second protrusion 31b that are closest to each other, it is possible to appropriately suppress bending of the movable plate 70 at the slits 71, 72. Therefore, it is possible to suppress the rigidity of the movable plate 70 from being locally too low depending on the positions of the slits 71, 72, making it difficult for cracks to occur starting from the slits 71, 72 and improving the durability of the movable plate 70.

[0112] While the present invention has been described above based on the embodiments, it is not limited to the above embodiments, and it is readily apparent that various improvements and modifications are possible without departing from the spirit of the present invention. For example, the first member 11 may be disposed at a position radially offset from the axis C. The structure of the negative pressure relief valve may also be modified as appropriate.

[0113] The position and length of the first orifice 19 may be changed as appropriate. A liquid chamber separate from the first liquid chamber 17 and the second liquid chamber 18 may be formed in the partitions 20, 51. An orifice separate from the first orifice 19 may communicate between the two liquid chambers.

[0114] Furthermore, a cup-shaped metal cap may be provided below the diaphragm 15 (on 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 metal cap and the diaphragm 15. This air chamber may be an enclosed space that has an air spring effect. A through-hole may be provided in part of the metal cap to open the air chamber to the atmosphere, and a damping effect may be added by the air passing through the through-hole.

[0115] In the above embodiments, engine mounts have been exemplified as an application of the hydraulic vibration damping devices 10, 50, and 60, but the application can be any application. Other application targets include, for example, motor mounts, member mounts, and differential mounts. Furthermore, 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. Alternatively, 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.

[0116] A part of each of the above embodiments may be replaced with a part of another embodiment, or a part of each of the above embodiments may be added to another embodiment. For example, the arrangement of the slits 71 and 72 in the fourth embodiment may be applied to the second and third embodiments.

[0117] Some of the above embodiments may be omitted. For example, the membrane portion 14 may be omitted, and the partitions 20, 51, 61 and the diaphragm 15 may be attached to the inner peripheral surface of the second member 12. The second side protrusion 36 of the first embodiment may be omitted. The base portion 24 may not protrude from the radial center of the first partition plate 23, and the first side protrusion 35 may be brought into contact with the radial center of the first partition plate 23.

[0118] Also, the first side protrusion 35 may be omitted. In this case, a groove may be formed in a corner on the tip side of the base 24, or the first protrusion 31 a having the slits 41, 42, and 71 formed therein may be brought into contact with the base 24 so that the communication hole 32 communicates with the first through-hole 25. Alternatively, a first through-hole provided in the center of the base 24 may be made to communicate with the communication hole 32.

[0119] In the above embodiment, the multiple first protrusions 31a and the multiple second protrusions 31b are arranged on concentric circles, but the centers of the multiple first protrusions 31a and the centers of the multiple second protrusions 31b may be offset from each other. The multiple first protrusions 31a and the multiple second protrusions 31b are not limited to being arranged alternately on both the upper and lower surfaces of the movable plate 30, 58, 70, but may also be arranged in the same positions on both the upper and lower surfaces. In this case, it is possible to easily deform the movable plate 30, 58, 70 at positions where there are no first protrusions 31a or second protrusions 31b.

[0120] The dimensions and shapes of the first protrusions 31a and the second protrusions 31b may also be changed as appropriate. For example, the height of the first protrusions 31a and the second protrusions 31b may be changed in the circumferential direction. Specifically, the tips of the first protrusions 31a and the second protrusions 31b may be wavy, or additional protrusions may be formed from a portion of the tips. This can suppress abnormal noise caused by contact between the first protrusions 31a and the second protrusions 31b and the first partition plates 23, 52 or the second partition plates 26, 55.

[0121] The positions, number, and widths of the slits 41 to 44, 71, and 72 described in the above embodiments may be changed as appropriate. For example, one to three slits, or four or more slits, may be provided in the circumferential direction of the first protrusion 31a and the second protrusion 31b. The number of slits may differ between the first protrusion 31a and the second protrusion 31b, or the number of slits may differ depending on the radial position.

[0122] A plurality of slits may be provided at positions that do not divide the first protrusions 31a or the second protrusions 31b equally. The slits may be positioned at the same position in the circumferential direction on the first protrusions 31a and the second protrusions 31b that are closest to each other. [Explanation of symbols]

[0123] 10,50,60 Liquid-filled vibration isolation device 11 First member 12 Second member 13 Vibration-isolating base 15 diaphragm 17 1st liquid chamber 18 2nd liquid chamber 20, 51, 61 Partition 23,52 First partition plate 25, 54, 62 First through hole 26,55 Second partition 28, 57, 64 Second through hole 30,58,70 Movable plate 30a 1st page 30b 2nd side 31a 1st protrusion (protrusion) 31b 2nd protrusion (protrusion) 41, 42, 43, 44, 71, 72 Slits 59 Communication hole C axis center

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 member that separates the liquid chamber into a first liquid chamber and a second liquid chamber, the partition body includes a first partition plate having a first through-hole formed therethrough in a plate thickness direction and facing the first liquid chamber; a second partition plate having a second through hole formed therethrough in a plate thickness direction and facing the second liquid chamber; a movable plate made of a disk-shaped elastic body, having a first surface on the first partition plate side and a second surface on the second partition plate side; an orifice that communicates the first liquid chamber with the second liquid chamber via the first through-hole and the second through-hole, outside the outer periphery of the movable plate; the movable plate includes a plurality of annular protrusions that protrude from the first surface and the second surface and surround an axis of the movable plate, A slit is formed in each of the plurality of protrusions, dividing the protrusion in the circumferential direction, The positions of the slits in the radially adjacent protrusions are different in the circumferential direction, The height of the protrusion, which is a dimension in the plate thickness direction, is greater than half the thickness of the protrusion, which is a dimension in the radial direction; The slit is formed over the entire height of the protrusion, A liquid-sealed vibration-damping device characterized in that two or more of the protrusions are arranged around the entire circumference from the outer peripheral edge of the movable plate toward the radially inward direction to the outermost edge of at least one of the first through hole and the second through hole.

2. 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 member that separates the liquid chamber into a first liquid chamber and a second liquid chamber, the partition body includes a first partition plate having a first through-hole formed therethrough in a plate thickness direction and facing the first liquid chamber; a second partition plate having a second through hole formed therethrough in a plate thickness direction and facing the second liquid chamber; a movable plate having a first surface on the first partition plate side and a second surface on the second partition plate side and made of a disk-shaped elastic body, the movable plate includes a plurality of annular protrusions that protrude from the first surface and the second surface and surround an axis of the movable plate, A slit is formed in each of the plurality of protrusions, dividing the protrusion in the circumferential direction, The positions of the slits in the radially adjacent protrusions are different in the circumferential direction, The height of the protrusion, which is a dimension in the plate thickness direction, is greater than half the thickness of the protrusion, which is a dimension in the radial direction; The slit is formed over the entire height of the protrusion, The movable plate has communicating holes formed therethrough in a plate thickness direction on inner circumferential sides of the plurality of protrusions, an orifice is provided that communicates the first liquid chamber with the second liquid chamber via the communication hole, the first through-hole, and the second through-hole; A liquid-sealed vibration-damping device characterized in that two or more of the protrusions are arranged around the entire circumference from the edge of the communicating hole radially outward to the innermost edge of at least one of the first through hole and the second through hole.

3. The protrusions include a plurality of first protrusions protruding from the first surface; 3. The hydraulic vibration damping device according to claim 1, further comprising: a plurality of second projections projecting from the second surface between the plurality of first projections.

4. 4. The hydraulic vibration isolating device according to claim 3, wherein the positions of the slits in the first protrusion and the second protrusion that are closest to each other are different in the circumferential direction.

5. 5. A liquid-filled vibration damping device according to claim 3, wherein an area where half the height of the first protrusion is projected in the thickness direction of the movable plate and an area where half the height of the second protrusion is projected in the thickness direction of the movable plate are radially separated from each other.

Images