JP5364019B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a liquid-filled vibration isolator, in particular, a liquid-filled vibration isolator suitable for use as an automobile cabin mount, engine mount, etc., among others, excellent damping performance against vibration input and rubber durability. The present invention relates to a liquid-filled vibration isolator that balances the above with a high level.

  Conventionally, as an anti-vibration device for preventing vibration generated on the unsprung side of an automobile from being transmitted to a cabin, for example, there is a device in which a liquid is sealed inside the device as described in Patent Document 1.

  As shown schematically in FIG. 3 in a longitudinal sectional perspective view, the liquid-filled vibration isolator described in Patent Document 1 is provided with an inner cylinder member 102 and a coaxial input with the inner cylinder member 102 to input vibration. The outer cylinder member 103 that is displaced relative to the inner cylinder member 102 in the axial direction when the inner cylinder member 102 is received, and two main body rubbers 104a that connect both ends of the outer cylinder member 103 to the outer peripheral surface of the inner cylinder member 102 in a liquid-tight manner. 104b and a fluid chamber 105 in which a non-compressed liquid is sealed in a space defined by the two main body rubbers 104a and 104b, and an outer cylinder member is provided in the middle of the inner cylinder member 102. An inner cylinder-side rigid protrusion 106 protruding to the 103 side is provided over the entire circumference, and a partition rubber 108 is provided to connect the outer peripheral surface of the inner cylinder-side rigid protrusion 106 and the inner peripheral surface of the outer cylinder member 103 in a liquid-tight manner. The fluid chamber 105 One of the liquid chamber 107a, a partition to 107b, in which provided their both liquid chambers 107a, the restricted passage 109 providing communication 107b to the inner cylinder side rigid protrusion 106.

  According to the liquid-filled vibration isolator 101, the liquid column resonance in the passage when the liquid in both the liquid chambers 107a and 107b flows through the restriction passage 109, the flow resistance that the liquid receives from the restriction passage, and the elastic member Based on deformation or the like, the vibration input to the vibration generating side can be attenuated and insulated from the vibration transmission side member.

  Usually, in such a liquid filled type vibration isolator 101, in order to obtain sufficient damping performance, it is necessary to cause more liquid to flow in the restricted passage 109. Therefore, in the liquid-filled vibration isolator 101 described in Patent Document 1 above, the ring-shaped outer cylinder side rigid protrusions 111a and 111b that protrude from the inner peripheral surface of the outer cylinder member 103 toward the inner cylinder member 102 are further provided. Are provided at both ends in the axial direction, and the main body rubbers 104a and 104b are fixed to the inner peripheral surfaces of the outer cylinder side rigid protrusions 111a and 111b, and are displaced up and down together with the inner cylinder member 102, for example, when vibration is input. When the inner cylinder side rigid protrusion 106 approaches or separates from the outer cylinder side rigid protrusions 111a and 111b, the liquid chambers 107a and 107b are effectively compressed or expanded vertically from both the inner and outer sides in the radial direction. Thus, the volume change of the liquid chambers 107a and 107b at the time of vibration input is increased to improve the damping performance of the apparatus.

  However, in this liquid-filled vibration isolator 101, the main body rubbers 104a and 104b are fixed to the inner peripheral surfaces of the outer cylinder side rigid ridges 111a and 111b. As a result, the radial thickness of the main body rubbers 104a and 104b is reduced. For this reason, for example, a large impact force is input from the vibration generating side, and the axial relative displacement between the inner cylinder member 102 and the outer cylinder member 103 is increased. When the amount is particularly large, there is a problem in that excessive shear deformation occurs in each of the main body rubbers 104a and 104b, and fatigue of the rubber proceeds.

  Further, since the cross-sectional areas of the main rubbers 104a and 104b are small and there is no room for absorbing deformation at the time of shear deformation, stress is applied in the vicinity of the fixing surface between the outer cylinder side rigid protrusions 111a and 111b and the main rubbers 104a and 104b. There was also a problem that the fixed surfaces were easily separated due to concentration.

  When the main body rubber 104a, 104b undergoes fatigue failure, vibrations on the unsprung side of the automobile are directly transmitted to the vehicle, which not only impairs the riding comfort of the vehicle but also causes vibration to other devices in the vehicle. It may cause serious malfunctions and accidents because it will cause side effects.

  Therefore, in such a liquid-filled vibration isolator, in addition to ensuring excellent damping performance, it is necessary to ensure excellent durability. For that purpose, only the device described in Patent Document 1 is required. In particular, further detailed examination is necessary to prevent fatigue damage of the main rubber.

  In this connection, for example, Patent Document 2 discloses a technique in which a damping plate is provided on the radially outer side of the inner cylinder seal member, and attenuation is obtained by shear resistance of a highly viscous liquid that flows due to vertical displacement of the damping plate. Is described. However, in order to improve the damping performance in a specific frequency range, it may be preferable to use a fluid having a low viscosity. In such a case, it is possible to obtain sufficient damping performance with the above-described damping plate. Since this is not possible, it must be said that the technique described in Patent Document 2 has low applicability to vibrations in a special frequency range.

  Further, for example, in Patent Documents 3 and 4, a projecting portion having a restriction passage (orifice passage) is formed on the member side constituting the outer cylinder, and the damping performance is provided by the flow resistance of the fluid passing through the restriction passage. Although these techniques are described, in these techniques, the above-mentioned protruding portion does not follow the vertical displacement of the members constituting the inner cylinder, so that a large volume change of the liquid chamber due to the vertical displacement of the protruding portion is obtained. Therefore, sufficient attenuation performance cannot be obtained.

International Publication WO2009 / 100205 Japanese Patent Laid-Open No. 9-329179 JP 2004-278706 A JP 2002-364698 A

  Therefore, in view of the above problems, the present invention increases the volume change of the liquid chamber at the time of vibration input to increase the damping performance of the device, and has excellent durability by preventing fatigue breakdown of the main rubber. It is an object of the present invention to provide a liquid-filled vibration isolator that can be exhibited.

The inventors have intensively studied to provide a liquid-filled vibration isolator that solves the above-described problems. As a result, the inner cylinder side rigid ridge and the outer cylinder side rigid ridge are provided in the apparatus, and the volume change amount of the liquid chamber is reduced. While effectively increasing the amount of shear deformation of the main rubber and the stress concentration between the main rubber and the outer cylinder, the outer cylinder side rigid protrusion and the shape of the main rubber are devised. Obtaining knowledge that mitigation is effective, the present invention has been completed.
Therefore, the gist configuration of the present invention for solving the above-described problems is as follows.

The liquid-filled vibration isolator of the present invention includes an inner cylinder member mounted on either the vibration generation side or the vibration transmission side, and an outer cylinder member disposed on the outer side of the inner cylinder member. An outer cylinder member connected to the other side, a first main body rubber liquid-tightly connecting one end of the outer cylinder member to the outer peripheral surface of the inner cylinder member, and the other end of the outer cylinder member connected to the inner cylinder member A second main body rubber that is liquid-tightly connected to the outer peripheral surface of the first main body rubber, a first main body rubber, a second main body rubber, an inner cylinder member, and an outer cylinder member. In a liquid-filled vibration isolator comprising a fluid chamber filled with liquid,
The inner cylinder member has an inner cylinder side rigid protrusion that protrudes from the outer peripheral surface toward the outer cylinder member at an intermediate portion in the axial direction over the entire circumference, and the outer cylinder surface and the outer surface of the inner cylinder side rigid protrusion A restriction that connects the inner circumferential surface of the cylindrical member in a liquid-tight manner, and provides a partition rubber that divides the fluid chamber into two liquid chambers together with the inner cylindrical-side rigid protrusion, and also provides communication between the two liquid chambers. A passage is provided in the inner cylinder side rigid protrusion,
The outer cylinder member has an inward flange-shaped first outer cylinder side rigid ridge projecting from the inner peripheral surface of the outer cylinder member into the first main body rubber toward the inner cylinder member, and the inner circumference An inward flange-shaped second outer cylinder side rigid protrusion that protrudes in the same direction from the surface into the second main body rubber, and the first outer cylinder side rigid protrusion and the second outer cylinder side At least one of the rigid ridges is arranged closer to the liquid chamber,
Both the first main body rubber and the second main body rubber enter the main body rubber along the outer peripheral surface of the inner cylinder member, and include the central axis of the inner cylinder member and cut along it. In the cross section, a ring-shaped cavity having a depth exceeding the first outer cylinder-side rigid protrusion or the second outer cylinder-side rigid protrusion is provided, and at least one of the voids faces the liquid chamber. It is characterized by being provided.

  Here, the inner cylinder side rigid ridge may be integrally formed with the inner cylinder member or may be configured separately in structure, and the outer cylinder side rigid ridge is formed by the outer cylinder member. Or may be configured separately in structure.

With respect to the outer cylinder side rigid ridge, the “inward flange shape” means the distance from the inner circumferential surface of the outer cylinder member body to the inner circumferential protruding end in the cross section, that is, the protruding height of the outer cylinder side rigid ridge. On the other hand, the outer cylinder side rigid protrusion is assumed to have a sufficiently thin shape.
The outer cylinder side rigid ridge may be terminated by extending straight inward in the radial direction, or, for example, an inner peripheral end portion may be curved toward the inner cylinder side rigid ridge. It can also be terminated with a simple shape.

  In addition, regarding the first or second outer cylinder-side rigid protrusion, “dispose closer to the liquid chamber” means that the main rubber covering the inner cylinder-side rigid protrusion-side surface of the outer cylinder-side rigid protrusion The outer cylinder side rigid protrusion is provided so that the thickness of the outer cylinder is 5 mm or less. The thickness may be 0 mm. In this case, the outer cylinder side rigid protrusion is exposed to the liquid chamber.

  Furthermore, with respect to the void, “the depth exceeding the first outer cylinder side rigid protrusion or the second outer cylinder side rigid protrusion” means that in the cross section, the void is the void. It is the depth which intersects with the extension line of the thickness direction center line of the 1st outer cylinder side rigid protrusion or the 2nd outer cylinder side rigid protrusion which is the closest to. However, when the inner peripheral end portion of the outer cylinder side rigid ridge is curved in the direction of the inner cylinder side rigid ridge, the thickness direction center line of the portion excluding the curved portion is extended. It shall be the depth that intersects the line.

  Preferably, at least one inner peripheral end portion of the first outer cylinder side rigid ridge and the second outer cylinder side rigid ridge is formed in the inner cylinder in the cross section. A shape in which the bottom surface of the space provided in the first main body rubber or the second main body rubber embedded in the outer cylinder side rigid protrusion is gently curved in a mountain shape. To do.

  Here, “slowly curved in a mountain shape” means that the outline of the void is not refracted in the cross section, and the radius of curvature of the outline at each point on the outline is 1.5 mm or more. As such, it means to provide the void.

  Preferably, the protrusion height of the inner cylinder side rigid ridge from the maximum diameter portion of the inner cylinder member is changed from the maximum diameter portion to the inner periphery of the outer cylinder member main body. The projection height of the first outer cylinder side rigid ridge and the second outer cylinder side rigid ridge is set to 50 to 80% of the radial distance. The range.

  Here, the “inner peripheral surface of the outer cylinder member main body” refers to the inner peripheral surface of the outer cylinder member excluding the outer cylinder-side rigid protrusion, and the outer cylinder member has an intermediate cylinder on the inner peripheral side. When it has, it shall mean the inner peripheral surface of the intermediate cylinder.

  In the place described in any one of Claims 1-3, Preferably, the thickness of the said axial direction of the said partition rubber is in the area | region of an outer peripheral surface side rather than the middle of the inner peripheral surface and outer peripheral surface of this partition rubber. Minimize.

  In the liquid-filled vibration isolator of the present invention, the inner cylinder side rigid protrusion on the outer peripheral surface of the inner cylinder member, and the first outer cylinder side rigid protrusion and the second outer cylinder side rigidity on the inner peripheral surface of the outer cylinder member. Each of the protrusions is provided and when the vibration is input, the inner cylinder side rigid protrusion and each outer cylinder side rigid protrusion approach or separate from each other to increase the volume change of the liquid chamber. As with the liquid-filled vibration isolator described in 1), excellent damping performance can be exhibited.

  In addition, as described above, in the conventional liquid-filled vibration isolator as described in Patent Document 1, the ring-shaped first outer cylinder side rigid protrusion and the second outer rib member are provided on the inner peripheral surface of the outer cylinder member. The outer cylinder side rigid ridges are provided, and the main body rubber is fixed to the inner peripheral surface of these outer cylinder side rigid ridges, and the substantial volume of the main body rubber is not sufficient. However, in the liquid-filled vibration isolator of the present invention, the axis of each outer cylinder-side rigid ridge has been problematic. By adopting an inward flange shape in which the thickness in the direction is sufficiently thin relative to the radial height, the volume of each body rubber can be secured sufficiently large, and shear deformation at the time of vibration input is effective It is possible to suppress the progress of rubber fatigue.

  Furthermore, since a space having a depth exceeding the outer cylinder-side rigid protrusion is provided, when an axial relative displacement occurs between the inner cylinder member and the outer cylinder member, The rubber is bent and deformed, and the stress concentration on the bonding surface between the main rubber and the outer cylinder side rigid protrusion is alleviated. Thereby, the deviation | shift of the said adhesive surface can be suppressed.

  On the other hand, when the depth of the void is not deeper than the outer cylinder-side protruding shape as in the conventional liquid-filled vibration isolator, the adhesive surface prevents the rubber near the void from being sufficiently bent. The stress concentration on the surface cannot be relaxed, and the separation of the adhesion surface cannot be suppressed.

  Therefore, according to the present invention, it has excellent damping performance, effectively suppresses the progress of fatigue of the main body rubber and the divergence due to the stress concentration on the adhesive surface between the main body rubber and the outer cylinder side rigid protrusion, and is durable. It is possible to provide a liquid-filled vibration isolator that greatly improves the above.

  In the liquid-filled vibration isolator of the present invention, since at least one of the first outer cylinder side rigid protrusion and the second outer cylinder side rigid protrusion is arranged closer to the liquid chamber, It is possible to secure a larger amount of rubber on the side of the cylinder-side rigid protrusion that is not on the liquid chamber side, and it is possible to more effectively disperse the shear deformation of rubber at the time of vibration input.

  Furthermore, in the liquid-filled vibration isolator of the present invention, the inner peripheral end portion of at least one of the first outer cylinder-side rigid protrusion and the second outer cylinder-side rigid protrusion in the cross section is defined as the inner cylinder. By curving toward the direction of the side rigid protrusion, it is possible to make it less likely to cause a separation of the adhesive surface near the inner peripheral end portion due to rubber deformation at the time of vibration input. By making the bottom surface of the cavity provided in the first main body rubber or the second main body rubber embedding the rigid ridge into a shape that gently slopes in a mountain shape, it becomes easier to bend the rubber around the cavity more evenly. Therefore, stress concentration can be more effectively suppressed.

  In addition, in the liquid filled type vibration damping device of the present invention, the protrusion height of the inner cylinder side rigid protrusion is set to a radial distance of 50 to 80 from the outer peripheral surface of the inner cylinder member to the inner peripheral surface of the outer cylinder member. %, And the projecting height of the outer cylinder side rigid ridge is in the range of 50 to 80% of the distance, so that more effective coexistence of the damping performance and durability of the device is realized.

  When the protrusion height of each protrusion is less than 50% of the distance, the volume change amount of the liquid chamber cannot be increased so much that a sufficient effect of improving the damping performance may not be obtained. On the other hand, if the protruding height of the inner cylinder side rigid ridge exceeds 80% of the distance, there is a tendency for the partition rubber to progress fatigue, and the protruding height of the outer cylinder side rigid ridge. If the amount exceeds 80% of the distance, the space width cannot be sufficiently secured, and stress concentration may occur in the rubber near the inner peripheral end portion of the outer cylinder side member.

Furthermore, in the liquid-filled vibration isolator of the present invention, the inner cylinder can be obtained by minimizing the thickness of the partition rubber in the region on the outer peripheral surface side rather than the middle between the inner peripheral surface and the outer peripheral surface of the partition rubber. When the member is displaced relative to the outer cylinder member in the axial direction, the partition rubber is bent at a portion close to the outermost radial direction, and more rubber portions can be moved together with the inner cylinder side rigid protrusion. Therefore, the volume change amount of the liquid chamber can be increased.
Therefore, the attenuation performance of the apparatus can be further improved.

It is a longitudinal section showing typically one embodiment of a liquid enclosure type vibration isolator by the present invention. It is a longitudinal cross-sectional view which shows typically other embodiment of the liquid filled type vibration isolator by this invention. It is a longitudinal cross-sectional perspective view which shows the conventional liquid enclosure type vibration isolator typically.

Hereinafter, the present invention will be described in detail with reference to the drawings.
In the embodiment shown in FIG. 1, the liquid-filled vibration isolator 1 is arranged coaxially on the outer side of the inner cylinder member 2 that is mounted on either the vibration generation side or the vibration transmission side. An outer cylindrical member 3 connected to the other side of the vibration generating side or vibration transmitting side, and a first main body rubber 4a for liquid-tightly connecting one end of the outer cylindrical member 3 to the outer peripheral surface of the inner cylindrical member 2. The second main body rubber 4b for liquid-tightly connecting the other end of the outer cylinder member 3 to the outer peripheral surface of the inner cylinder member 2, the first main body rubber 4a and the second main body rubber 4b, and the inner cylinder A fluid chamber 5 formed by sealing an incompressible liquid in a space defined by the member 2 and the outer cylinder member 3 is provided.

  The inner cylinder member 2 has an inner cylinder side rigid protrusion 6 that protrudes from the outer peripheral surface to the outer cylinder member 3 side in an intermediate portion in the axial direction of the central axis A over the entire circumference. The outer peripheral surface of the inner cylinder side rigid protrusion 6 and the inner peripheral surface of the outer cylinder member 3 are liquid-tightly connected, and together with the inner cylinder side rigid protrusion 6, the fluid chamber 5 is divided into two liquid chambers 7a and 7b. A partition rubber 8 is provided in the inner cylinder side rigid ridge 6 and a restricting passage 9 is provided to provide communication between the liquid chambers 7a and 7b.

  Further, the outer cylinder member 3 has an inward flange-like first outer cylinder side rigid protrusion that protrudes from the inner peripheral surface of the outer cylinder member 3 into the first main body rubber 4a toward the inner cylinder member 2 side. The first outer cylinder, and the second outer cylinder side rigid protrusion 11b having an inward flange shape projecting in the same direction from the inner peripheral surface into the second main body rubber 4b. The side rigid protrusion 11a is disposed closer to the first liquid chamber 7a. In the illustrated example, the thickness b of the main body rubber that covers the surface on the inner cylinder side rigid protrusion 6a side of the outer cylinder side rigid protrusion 11a is 1 mm.

Furthermore, both the first main body rubber 4a and the second main body rubber 4b enter the main body rubber inside 4a, 4b along the outer peripheral surface of the inner cylindrical member 2, and the central axis of the inner cylindrical member 2 A ring-shaped empty space having a depth d ₁ , d ₂ exceeding the first outer cylinder side rigid protrusion 11a or the second outer cylinder side rigid protrusion 11b in a cross section including A and cut along the same. The spaces 10 and 20 are provided, and the space 10 provided in the first main body rubber 4a is provided facing the liquid chamber 7a.

  In the liquid filled type vibration isolator 1 shown in the drawing, the inner cylinder member 2 has a disk-shaped inner cylinder side flange 13a at one end thereof for connection to one side of the vibration generating side or the vibration transmitting side. In addition, the outer cylinder member 3 has an outer cylinder side flange 13b on a disk provided at one end thereof for connection to the vibration generation side or the other side of the vibration transmission side.

  Here, the first outer cylinder side rigid ridge 12a is connected to the outer cylinder side flange 13b without being integrally formed with the outer cylinder member 3, whereas the second outer cylinder side rigid ridge 12b is connected to the outer cylinder side flange 13b. The outer cylinder member 3 is integrally formed with the lower end portion.

  The outer cylinder member 3 has a covering rubber 22 over the entire circumference of the inner circumferential surface side portion, and further has an intermediate cylinder 23 over the entire circumference of the inner circumferential surface side portion of the coating rubber 22.

  Further, the inner cylinder member 2 has a maximum diameter portion 14 and a small diameter portion 15, and the inner cylinder side rigid protrusion 6 is fitted to the small diameter portion 14 of the inner cylinder member 2 to be axially arranged. One end is constrained by a step 16 formed by a difference in diameter between the maximum diameter portion 15 and the small diameter portion 14, and the other end in the axial direction is a second main body rubber 4b and a part of the second main body rubber 4b. It is restrained by the sleeve 21 pushed up from the other end side. The sleeve 21 is fitted into the small diameter portion 14 of the inner cylinder member 2.

  The second liquid chamber 7b is provided with a liquid sealing port 17 for sealing the liquid into the fluid chamber 5 when the apparatus is manufactured. The liquid sealing port 17 is liquid-tightly closed by a rivet 18. . The first main body rubber 4a has a ring-shaped constricted portion 19 that enters from the radially outer side toward the central axis A. By adjusting the size of the constricted portion 19, the first main body rubber 4a. The spring constant in the axial direction of 4a can be adjusted.

  The inner peripheral end portion 12a of the first outer cylinder side rigid ridge 11a is curved with a radius of curvature R toward the direction of the inner cylinder side rigid ridge 6, and further, the outer cylinder side rigid ridge 11a is The bottom surface of the void 10 provided in the first main rubber 4a to be embedded is gently curved in a mountain shape.

In the liquid-filled vibration isolator 1 of the present invention, the maximum depth points Pd ₁ and Pd ₂ of the cavities 10 and 20 are positioned in the vicinity of the outer peripheral surface of the inner cylinder member 2 as shown in the drawing. The voids 10 and 20 are preferably provided, and according to this, the main body rubber 4a is easily bent near the outer peripheral surface of the inner cylindrical member 2, and the volume change amount of the liquid chamber when the vibration is input can be reduced. More can be secured.

Further, in the illustrated example, each protrusion 6 and 11a, the protrusion height h _o and h _i and 11b are both radial distance H from the outer circumferential surface of the inner cylindrical member 2 to the inner peripheral surface of the outer cylinder member 3 Of 50 to 80%.

  Furthermore, the thickness w of the partition rubber 8 is a shape that gradually decreases from the inner cylinder member 2 side to the outer cylinder member 3 side. The minimum thickness point Pw of the partition rubber 8 is the inner diameter of the outer cylinder member 3. It is within a range of 5 mm or less inward from the peripheral surface, and is closer to the outer peripheral surface than the middle between the inner peripheral surface and the outer peripheral surface of the partition rubber 8.

  In the liquid filled type vibration damping device 1 of the present invention, the restriction passage 9 can be in any form, for example, a two-story structure with two internal windings, such as that shown in FIG. A peripheral arrangement structure such as that shown in FIG.

  The liquid-filled vibration isolator 1 shown in FIG. 2 is the same as the liquid-filled vibration isolator 1 shown in FIG. 1 except that the shape of the restriction passage 9 is different.

Center axis d radial height of the cavity maximum depth Pd cavity maximum depth Pw rubber partition minimum thickness h _i a cylinder side stiffness projection points of the points of the h _o outer cylinder side A inner tube member Radial height of rigid ridge t Thickness of outer cylinder side rigid ridge b Thickness of rubber facing outer cylinder side rigid ridge w Thickness of partition rubber in axial direction 1 Liquid-filled vibration isolator 2 Inner cylinder Member 3 Outer cylinder member 4a First main body rubber 4b Second main body rubber 5 Fluid chamber 6 Inner cylinder side rigid protrusion 7a Liquid chamber 7b Liquid chamber 8 Partition rubber 9 Restriction passage 10 Space 11a First outer cylinder side rigidity Ridge 11b second outer cylinder side rigid ridge 12a inner peripheral end portion 12b of first outer cylinder side rigid ridge inner peripheral end portion 13a of second outer cylinder side rigid ridge 13b inner cylinder side flange 13b outer cylinder Side flange 14 Maximum diameter portion 15 Small diameter portion 16 Step 17 Liquid filling port 18 Rivet 19 Constricted portion 20 Space 21 Sleeve 22 Covering rubber 23 Mediation Tube

Claims (4)

An inner cylinder member mounted on either the vibration generation side or the vibration transmission side, an outer cylinder member disposed outside the inner cylinder member and connected to the vibration generation side or the other side of the vibration transmission side, A first main body rubber that liquid-tightly connects one end of the outer cylinder member to the outer peripheral surface of the inner cylinder member, and a second main body rubber that liquid-tightly connects the other end of the outer cylinder member to the outer peripheral surface of the inner cylinder member. A main body rubber, and a fluid chamber formed by sealing an incompressible liquid in a space defined by the first main body rubber and the second main body rubber, and the inner cylinder member and the outer cylinder member. In a liquid-filled vibration isolator
The inner cylinder member has an inner cylinder side rigid protrusion that protrudes from the outer peripheral surface toward the outer cylinder member at an intermediate portion in the axial direction over the entire circumference, and the outer cylinder surface and the outer surface of the inner cylinder side rigid protrusion A restriction that connects the inner circumferential surface of the cylindrical member in a liquid-tight manner, and provides a partition rubber that divides the fluid chamber into two liquid chambers together with the inner cylindrical-side rigid protrusion, and also provides communication between the two liquid chambers. A passage is provided in the inner cylinder side rigid protrusion,
The outer cylinder member has an inward flange-shaped first outer cylinder side rigid ridge projecting from the inner peripheral surface of the outer cylinder member into the first main body rubber toward the inner cylinder member, and the inner circumference An inward flange-shaped second outer cylinder side rigid protrusion that protrudes in the same direction from the surface into the second main body rubber, and the first outer cylinder side rigid protrusion and the second outer cylinder side At least one of the rigid ridges is arranged closer to the liquid chamber,
Both the first main body rubber and the second main body rubber enter the main body rubber along the outer peripheral surface of the inner cylinder member, and include the central axis of the inner cylinder member and cut along it. In the cross section, a ring-shaped cavity having a depth exceeding the first outer cylinder-side rigid protrusion or the second outer cylinder-side rigid protrusion is provided, and at least one of the voids faces the liquid chamber. A liquid-filled vibration isolator characterized by being provided.   In the cross section, at least one inner peripheral end portion of the first outer cylinder side rigid protrusion and the second outer cylinder side rigid protrusion is curved toward the inner cylinder side rigid protrusion. 2. The liquid-filled type protection according to claim 1, wherein a bottom surface of a space provided in the first main body rubber or the second main body rubber in which the outer cylinder side rigid protrusion is embedded is gently curved in a mountain shape. Shaker.   The protrusion height of the inner cylinder side rigid protrusion from the maximum diameter part of the inner cylinder member is in the range of 50 to 80% of the radial distance from the maximum diameter part to the inner peripheral surface of the outer cylinder member main body. The liquid according to claim 1, wherein the protrusion height of the first outer cylinder side rigid protrusion and the second outer cylinder side rigid protrusion is in the range of 50 to 80% of the same radial distance. Enclosed vibration isolator.   The liquid-filled type according to any one of claims 1 to 3, wherein a thickness of the partition rubber in the axial direction is minimum in a region on the outer peripheral surface side than an intermediate between the inner peripheral surface and the outer peripheral surface of the partition rubber. Anti-vibration device.

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