JP6231761B2 - Liquid-filled vibration isolator - Google Patents

Description

  The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator that can secure a sealing property while reducing cost by omitting vulcanization adhesion of a rubber-like elastic body such as a diaphragm.

  In a vehicle such as an automobile, a vibration isolator is provided between an engine that is a vibration generation source and a vehicle body that receives vibration in order to suppress transmission of vibration to the vehicle body side. According to the liquid-filled vibration isolator disclosed in Patent Document 1 as one type of such a vibration isolator, the first mounting member and the cylindrical second mounting member are composed of a rubber-like elastic body. Connected with a substrate. A liquid sealing chamber is formed between the diaphragm (rubber-like elastic body) vulcanized and bonded to the partition body, and the liquid sealing chamber is partitioned into a plurality of liquid chambers by the partition body. Since the plurality of liquid chambers communicate with each other through the orifice, the vibration damping function and the vibration insulation function are achieved by the liquid flow effect between the liquid chambers by the orifice and the vibration isolation effect of the vibration isolation substrate.

JP-A-7-317833

  However, in the above-described technique, the diaphragm (rubber-like elastic body) that forms the liquid chamber is vulcanized and bonded to the partition body in order to ensure sealing performance, and thus there is a problem that it is difficult to reduce the cost.

  The present invention has been made in order to solve the above-described problems, and is liquid-filled that can secure sealing performance while reducing cost by omitting vulcanization adhesion of a rubber-like elastic body (elastic film) such as a diaphragm. An object of the present invention is to provide a vibration isolator.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the liquid-filled vibration isolator of claim 1, the first mounting member and the cylindrical second mounting member are connected by the vibration isolating base composed of a rubber-like elastic body. In addition, a liquid sealing chamber is formed between the anti-vibration base and the diaphragm that is attached to the second attachment member and is made of a rubber-like elastic body. The liquid enclosure chamber is partitioned into a plurality of liquid chambers by the partition, and the plurality of liquid chambers communicate with each other through an orifice.

A peripheral edge portion whose axial dimension is set larger than the axial dimension of the main body portion of the diaphragm that reciprocates in the axial direction is formed integrally with the main body portion, and is positioned on the radially outer side of the main body portion. A pair of pressing portions disposed inside the second attachment member presses one end side in the axial direction and the other end side in the axial direction of the peripheral portion, and the peripheral portion is compressed and deformed in the axial direction. On the other hand, the peripheral portion is stretched and deformed in the radial direction, and the entire circumference of at least one of the outer peripheral portion and the inner peripheral portion of the peripheral portion that is stretched and deformed in the radial direction is brought into close contact with the peripheral wall portion. Since the pair of pressing portions and the peripheral portion and the entire periphery of the peripheral portion are liquid-tight, there is an effect that sealing performance can be ensured while reducing the cost by omitting the vulcanization adhesion of the diaphragm.
The peripheral edge portion or the peripheral wall portion is liquid-tight by one or a plurality of liquid seal portions in which a part in the axial direction protrudes in the radial direction over the entire circumference. Since the liquid sealing part protrudes in the radial direction over the entire circumference in the axial direction, the liquid sealing part is in close contact with the liquid sealing part and is stable against pressure fluctuations and vibrations of the liquid sealed in the liquid sealing chamber. There is an effect that a sealing action can be secured.
In a state where the peripheral edge portion is compressed and deformed in the axial direction by the pair of pressing portions, a gap is provided between a part of the peripheral edge portion and the peripheral wall portion, so that the protrusion of the peripheral edge portion due to swelling of the peripheral edge portion or the like can be made difficult to occur. . As a result, there is an effect that it is possible to suppress deterioration of the sealing performance due to the protrusion of the peripheral edge.

  According to the liquid-filled vibration isolator according to claim 2, the first mounting member and the cylindrical second mounting member are connected by the vibration isolating base made of a rubber-like elastic body, and are attached to the second mounting member. A liquid sealing chamber is formed between the anti-vibration substrate and the liquid chamber forming member. The partition has an elastic partition film composed of a rubber-like elastic body, the liquid enclosure chamber is partitioned into a plurality of liquid chambers by the partition, and the plurality of liquid chambers communicate with each other through an orifice.

  A peripheral edge portion whose axial dimension is set larger than the axial dimension of the main body portion of the elastic partition membrane that reciprocates in the axial direction is formed integrally with the main body portion and is located on the radially outer side of the main body portion. The one end side in the axial direction and the other end side in the axial direction of the peripheral edge are respectively pressed by the pair of pressing portions arranged inside the second attachment member, and the peripheral edge is compressed and deformed in the axial direction. On the other hand, the peripheral portion is stretched and deformed in the radial direction, and the entire circumference of at least one of the outer peripheral portion and the inner peripheral portion of the peripheral portion that is stretched and deformed in the radial direction is brought into close contact with the peripheral wall portion. Since the pair of pressing portions and the peripheral portion and the entire periphery of the peripheral portion are liquid-tight, there is an effect that sealing performance can be ensured while reducing the cost by omitting the vulcanization adhesion of the elastic partition membrane.

The peripheral edge portion or the peripheral wall portion is liquid-tight by one or a plurality of liquid seal portions in which a part in the axial direction protrudes in the radial direction over the entire circumference. Since the liquid sealing part protrudes in the radial direction over the entire circumference in the axial direction, the liquid sealing part is in close contact with the liquid sealing part and is stable against pressure fluctuations and vibrations of the liquid sealed in the liquid sealing chamber. There is an effect that a sealing action can be secured.
In a state where the peripheral edge portion is compressed and deformed in the axial direction by the pair of pressing portions, a gap is provided between a part of the peripheral edge portion and the peripheral wall portion, so that the protrusion of the peripheral edge portion due to swelling of the peripheral edge portion or the like can be made difficult to occur. . As a result, there is an effect that it is possible to suppress deterioration of the sealing performance due to the protrusion of the peripheral edge.
According to the liquid-filled type vibration isolator of the third aspect, the opposing wall portion that faces the peripheral wall portion with a predetermined interval is located on the radially inner side or the radially outer side of the peripheral wall portion. In a state before the peripheral portion is compressed and deformed in the axial direction by the pair of pressing portions, the radial dimension of the peripheral portion and the liquid seal portion is set to be smaller than the radial dimension between the peripheral wall portion and the opposing wall portion. In the state in which the peripheral portion is compressed and deformed in the axial direction by the pressing portion, the radial extension of the peripheral portion is restricted by the peripheral wall portion and the opposing wall portion. As a result, the space between the peripheral wall portion and the opposing wall portion and the peripheral edge portion can be made liquid-tight, so that in addition to the effect of the first or second aspect, there is an effect of ensuring the sealing performance.

According to the liquid-filled type vibration damping device of the fourth aspect, the peripheral wall portion is located on the radially outer side of the peripheral edge portion, and the opposing wall portion is located on the radially inner side of the peripheral edge portion. The outer peripheral part of the peripheral part is brought into close contact with the peripheral wall part. In the case where the peripheral wall portions protruding from the pair of pressing portions are axially abutted with each other, the liquid sealing portion presses the peripheral wall portion or the peripheral edge portion while avoiding the mating surfaces of the peripheral wall portions. When the peripheral wall portion protruding from one of the pair of pressing portions is in contact with the other of the pair of pressing portions, the peripheral wall portion or the peripheral portion is liquid-sealed by avoiding the mating surface of the peripheral wall portion and the pressing portion. Press. As a result, it is possible to prevent the liquid sealing portion and the peripheral portion from being bitten by the mating surfaces of the peripheral wall portions and the mating surface of the peripheral wall portion and the pressing portion, so that in addition to the effect of any one of claims 1 to 3 There is an effect of improving the sealing performance.

According to the liquid filled type vibration damping device of the fifth aspect, the annular neck portion located between the main body portion and the peripheral portion is configured integrally with the main body portion and the peripheral portion. The neck portion is pressed in the axial direction by the axial end portion of the opposing wall portion or the peripheral wall portion located on the radially inner side of the peripheral edge portion. When the neck part is not pressed in the axial direction, when the main body part reciprocates in the axial direction, a tensile force acts radially inward on the peripheral part via the neck part or the neck part moves in the axial direction. To do. If it does so, there exists a possibility that the sealing performance of a peripheral part may fall. In contrast, by pressing the neck portion in the axial direction, the tensile force acting on the peripheral portion and the movement of the neck portion in the axial direction can be suppressed. Therefore, in addition to the effect of any one of claims 1 to 4, There is an effect capable of suppressing the deterioration of the sealing performance of the part.
Neck includes with projecting surface or al axial direction opposite to the fluid-filled chamber, a convex portion provided over the entire circumference of the neck. Since the area where the pressing force is applied to the contact area by the convex portion can be reduced, the sealing performance can be secured even with a small pressing force. Furthermore, even if a circumferential wrinkle is formed at the base of the convex portion, there is no liquid on the surface of the neck portion on the side from which the convex portion protrudes, so that it is possible to prevent deterioration in sealing performance due to the wrinkle .

According to the liquid-filled type vibration isolator according to the sixth aspect, the annular neck portion located between the main body portion and the peripheral portion is configured integrally with the main body portion and the peripheral portion. The neck portion is pressed in the axial direction by the axial end portion of the opposing wall portion or the peripheral wall portion located on the radially inner side of the peripheral edge portion. When the neck part is not pressed in the axial direction, when the main body part reciprocates in the axial direction, a tensile force acts radially inward on the peripheral part via the neck part or the neck part moves in the axial direction. To do. If it does so, there exists a possibility that the sealing performance of a peripheral part may fall. On the other hand, by pressing the neck portion in the axial direction, the tensile force acting on the peripheral portion and the movement of the neck portion in the axial direction can be suppressed, so that the sealing performance of the peripheral portion can be suppressed from decreasing.
Furthermore, the restricting portion located between the neck portion and the main body portion is formed integrally with the neck portion and the main body portion, and the radially inner side of the restricting portion is in close contact with the inner peripheral wall portion, so that it acts on the neck portion and the peripheral portion. The tensile force to be suppressed can be suppressed. As a result of these, in addition to the effect of any one of claims 1 to 5, there is an effect of suppressing the deterioration of the sealing performance at the peripheral portion.

It is an axial sectional view of the liquid filled type vibration isolator in the first embodiment of the present invention. It is an expanded sectional view of the liquid filling type vibration isolator which expands and shows the part shown by II of FIG. It is an exploded view of a partition. It is a fragmentary sectional view of a cylinder member, a fixed member, and a diaphragm. (A) is the one side sectional view of the diaphragm of the liquid enclosure type vibration isolator in 2nd Embodiment, (b) is the elements on larger scale of the liquid enclosure type vibration isolator. (A) is the one side sectional view of the diaphragm of the liquid enclosure type vibration isolator in 3rd Embodiment, (b) is the elements on larger scale of the liquid enclosure type vibration isolator. (A) is the one side sectional view of the diaphragm of the liquid enclosure type vibration isolator in 4th Embodiment, (b) is the elements on larger scale of the liquid enclosure type vibration isolator. (A) is the one side sectional view of the diaphragm of the liquid filled type vibration isolator in 5th Embodiment, (b) is the elements on larger scale of the liquid filled type vibration isolator. It is an axial direction sectional view of a liquid enclosure type vibration isolator in a 6th embodiment. FIG. 10 is an enlarged cross-sectional view of a liquid-filled vibration isolator showing a portion indicated by X in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is an axial sectional view of a liquid filled type vibration damping device 1 according to a first embodiment of the present invention. As shown in FIG. 1, a liquid-filled vibration isolator 1 includes a first attachment member 2 attached to a power unit (not shown) such as an automobile engine, and a vehicle body below the power unit via a bracket (not shown). A cylindrical second attachment member 3 attached to the frame is connected to the first attachment member 2 and the second attachment member 3 and a vibration-proof base 4 made of a rubber-like elastic body.

  FIG. 1 shows a single state of the liquid-filled vibration isolator 1 before being mounted on an automobile. In the present embodiment, the shared support load of the power unit is input in the direction of the axis O (vertical direction in FIG. 1) passing through the axis center. Accordingly, in the mounted state, the first mounting member 2 and the second mounting member 3 are displaced in the axial direction toward each other due to elastic deformation of the vibration-proof base 4. In the following description, the vertical direction means the vertical direction of the axis O in FIG. 1 unless otherwise specified.

  As shown in FIG. 1, the first mounting member 2 is mainly formed of a rigid material such as a metal material, and a bolt hole 2a is provided on the upper surface. A bolt (not shown) attached to the bracket of the power unit is fastened and fixed to the bolt hole 2a, whereby the first attachment member 2 is attached to the vibration source. The second attachment member 3 is formed in a cylindrical shape mainly from a rigid material such as a metal material, and is attached to the vehicle body frame side (not shown) via a bracket or the like.

  The anti-vibration base 4 is formed in a truncated cone shape, and its upper end is vulcanized and bonded to the outer peripheral surface of the first mounting member 2 and its lower end is bonded to the upper inner peripheral surface of the second mounting member 3. An upper constricted hollow portion is formed on the lower surface side of the vibration isolating base 4, and a rubber film 5 covering the inner peripheral surface of the second mounting member 3 is continuously provided on the stepped portion 4 a at the lower end of the vibration isolating base 4. Is done. As for the 2nd attachment member 3, the cylindrical bracket member 6 is externally fitted by the upper end part, and the stopper rubber 7 is adhere | attached on the upper end part of the bracket member 6. FIG.

  A diaphragm 10 formed in a partial spherical shape with a rubber film is attached to the lower end portion of the second attachment member 3. A liquid sealing chamber (first liquid chamber L1 and second liquid chamber L2) is formed between the diaphragm 10 and the lower surface of the vibration isolation base 4. The liquid enclosing chamber is partitioned by a partition 20 into a first liquid chamber L1 on the vibration-proof substrate side 4 and a second liquid chamber L2 on the diaphragm 10 side, and an incompressible liquid (hereinafter referred to as “liquid”) such as water or ethylene glycol. ) Is enclosed.

  The partition 20 has a cylindrical member 21 whose upper end is in contact with the stepped portion 4 a and held inside the rubber film 5, and an opening formed in the central portion of the cylindrical member 21 is closed and a peripheral edge is added to the cylindrical member 21. And an elastic partition film 22 to be glued. Between the outer peripheral surface of the cylindrical member 21 and the inner peripheral surface of the rubber film 5, an orifice 23 that connects the first liquid chamber L1 and the second liquid chamber L2 is formed. In the liquid-filled vibration isolator 1, when vibration with a large amplitude occurs due to the unevenness of the traveling road surface, the liquid flows through the orifice 23 between the first liquid chamber L1 and the second liquid chamber L2, The vibration is attenuated by the liquid flow effect. On the other hand, the fine amplitude vibration is attenuated by the reciprocating motion of the elastic partition film 22.

  A diaphragm 10 that reciprocates by vibration input to the liquid-filled vibration isolator 1 includes a main body portion 11 that is formed in a partially spherical shape, an annular neck portion 12 that is positioned radially outward of the main body portion 11, and a neck portion. 12 is provided with a peripheral edge portion 13 located on the radially outer side of 12, and a liquid seal portion 14 projecting radially outward from the outer peripheral surface of the peripheral edge portion 13, which is a rubber-like elastic body (in this embodiment) Butyl rubber). By making the diaphragm 10 made of butyl rubber, it is possible to ensure the permeation blocking property and durability of the liquid sealed in the liquid sealing chamber.

  The peripheral dimension 13 of the diaphragm 10 is set such that the axial dimension is larger than the axial dimension (vertical direction in FIG. 1) of the main body part 11 and the neck part 12. Moreover, the peripheral part 13 is set so that the radial dimension is smaller than the axial dimension. The diaphragm 10 is attached to the inside of the second attachment member 3 by sandwiching the peripheral edge portion 13 between the lower end portion of the cylindrical member 21 and the fixing member 30. The liquid sealing part 14 is provided to project radially outward from the two axial positions of the peripheral edge part 13 over the entire circumference, and each liquid sealing part 14 is formed in a triangular cross section.

  Next, the fixing structure of the diaphragm 10 will be described. The cylindrical member 21 has a pressing portion 24 at the lower end. The pressing portion 24 is an annular portion having a flat surface orthogonal to the axis O passing through the axial center of the cylindrical member 21. A cylindrical outer peripheral wall portion 25 is provided on the radially outer side of the pressing portion 24 so as to project downward in the axial direction (in a direction away from the vibration isolation base 4), and on the radially inner side of the pressing portion 24, the outer peripheral wall portion. A cylindrical inner peripheral wall portion 26 that is opposed to the main body 25 with a predetermined interval and extends downward in the axial direction is provided.

  The fixing member 30 is a member formed in an annular shape, and is positioned on the radially outer side of the pressing portion 31 and an annular pressing portion 31 having a flat surface perpendicular to the axis O passing through the axial center of the fixing member 30. And a cylindrical outer peripheral wall portion 32 erected toward the upper side in the axial direction (direction approaching the vibration isolation base 4). In addition, the fixing member 30 is erected on the radially outer side of the upper end surface of the outer peripheral wall portion 32 in the radial direction and on the inner side in the radial direction of the pressing portion 31, and is fixed to the outer peripheral wall portion 32. And a cylindrical inner peripheral wall portion 34 that is opposed to each other at an interval and extends upward in the axial direction.

  The height of the inner peripheral wall portion 34 of the fixing member 30 is set lower than the height of the outer peripheral wall portion 32, and the height of the inner peripheral wall portion 26 of the cylindrical member 21 is set lower than the height of the outer peripheral wall portion 25. Further, the inner diameter of the exterior portion 33 of the fixing member 30 is set to be approximately the same as the outer diameter of the outer peripheral wall portion 25 of the cylindrical member 21, and the height of the exterior portion 33 of the fixing member 30 is set to the height of the cylindrical member 21. It is set to be substantially the same as the height of the outer peripheral wall portion 25. Thereby, while the outer peripheral wall part 25 of the cylindrical member 21 is press-fit in the exterior part 33 of the fixing member 30, the outer peripheral wall part 32 of the fixing member 30 and the outer peripheral wall part 25 of the cylindrical member 21 can be faced | matched. The fixing member 30 can be fixed to the lower end portion of the cylindrical member 21 as described above. When the cylindrical member 21 and the fixing member 30 are made of synthetic resin, it can be fixed by welding instead of fixing the fixing member 30 to the cylindrical member 21 by press-fitting.

  When the outer peripheral wall portions 25 and 32 of the cylindrical member 21 and the fixing member 30 are abutted with each other, an axial gap is formed between the inner peripheral wall portions 26 and 34, and between the pressing portions 24 and 31, An axial gap larger than the axial gap between the peripheral wall portions 26 and 34 is formed. A space between the pressing portions 24 and 31 is a space in which the peripheral edge portion 13 of the diaphragm 10 is accommodated, and a space between the inner peripheral wall portions 26 and 34 is a space in which the neck portion 12 of the diaphragm 10 is accommodated.

  With reference to FIG. 2, the fixing structure of the diaphragm 10 will be further described. FIG. 2 is an enlarged cross-sectional view of the liquid-filled vibration isolator 1 showing a portion indicated by II in FIG. The neck portion 12, the peripheral edge portion 13, and the liquid sealing portion 14 of the diaphragm 10 are crushed in the axial direction and the radial direction by the cylindrical member 21 and the fixing member 30 to be compressed and deformed. Thereby, the neck part 12, the peripheral part 13, and the liquid sealing part 14 can be made liquid-tight.

  Here, the outer peripheral wall portion 25 and the inner peripheral wall portion 26 are at least on a virtual plane P1 perpendicular to the axis O (see FIG. 1) passing through the axial center of the second mounting member 3 and on which the liquid seal portion 14 is located in the plane. A part is located, and the radial extension of the peripheral edge 13 is restricted. Similarly, the outer peripheral wall portion 32 and the inner peripheral wall portion 34 are at least on an imaginary plane P2 perpendicular to an axis O (see FIG. 1) passing through the axial center of the second mounting member 3 and in which the liquid sealing portion 14 is located in the plane. A part is located, and the radial extension of the peripheral edge 13 is restricted. As a result, the deformation of the peripheral portion 13 on the back side (radially inner side, left side in FIG. 2) of the liquid sealing portion 14 is restricted, so that each liquid sealing portion 14 presses the mating surface (outer peripheral wall portions 25, 32). Can be secured.

  Further, the liquid sealing portion 14 is formed by a joining surface between the cylindrical member 21 (see FIG. 1) and the fixing member 30, specifically, an axial end portion of the outer peripheral wall portion 25 and an axial end portion of the outer peripheral wall portion 32. The outer peripheral wall portions 25 and 32 are pressed against the butted surface (contact surface). Thereby, it can prevent that the front-end | tip (radial direction outer side end) of the liquid sealing part 14 is bitten by the contact surface of the outer peripheral wall parts 25 and 32. FIG. Further, since the mating surfaces (outer peripheral wall portions 25, 32) pressed by the liquid sealing portions 14 can be secured, the sealing performance by the liquid sealing portions 14 can be improved.

  Next, with reference to FIG.1 and FIG.3, the manufacturing method of the liquid enclosure type vibration isolator 1 is demonstrated. FIG. 3 is an exploded view of the partition 20. As shown in FIG. 3, after the elastic partition film 22 is vulcanized and bonded to the cylindrical member 21, the peripheral edge portion 13 of the diaphragm 10 is interposed between the outer peripheral wall portion 25 and the inner peripheral wall portion 26 formed at the lower end portion of the cylindrical member 21. The fixing member 30 is press-fitted and fixed (or welded) to the lower end portion of the cylindrical member 21 while being inserted. Thereby, the peripheral part 13 of the diaphragm 10 can be pinched | interposed between the cylinder member 21 and the fixing member 30 without carrying out vulcanization | cure adhesion, and the partition body 20 and the diaphragm 10 can be integrated.

  As shown in FIG. 3, the diaphragm 10 has a protruding portion 15 protruding from the neck portion 12 toward the lower side in the axial direction (vertical direction in FIG. 3). The convex portion 15 is formed over the entire circumference of the neck portion 12. The convex portion 15 is a portion that is pressed against the axial end portion of the inner peripheral wall portion 34 of the fixing member 30, and the axial dimension of the neck portion 12 is increased by the amount of the convex portion 15, thereby improving the sealing performance. Can do.

  As shown in FIG. 1, after the vibration-proof base 4 is vulcanized and bonded to the first mounting member 2 and the second mounting member 3, the partition body 20 to which the diaphragm 10 is fixed, for example, in a liquid is connected to the second mounting member. 3 is inserted until it hits the stepped portion 4a. A load is applied to the outer periphery on the lower end side of the second mounting member 3 to reduce the diameter of the second mounting member 3, and the outer periphery of the tubular member 21 is pressed against the inner peripheral surface of the rubber film 5. Thereby, a liquid can be enclosed between the vibration-proof substrate 4 and the diaphragm 10. Next, the upper end portion of the second mounting member 3 is press-fitted into the bracket member 6, and the stopper rubber 7 is attached to the bracket member 6.

  According to the liquid-filled vibration isolator 1 manufactured as described above, the pressing portions 24 and 31 and the outer peripheral wall portions 25 and 32 and the entire periphery of the peripheral edge portion 13 of the diaphragm 10 are liquid-tight. Thus, the sealing property can be secured while reducing the cost by omitting the vulcanization adhesion of 10.

  Next, the elastic deformation behavior of the peripheral edge portion 13 and the liquid seal portion 14 when the diaphragm 10 is sandwiched between the tubular member 21 and the fixing member 30 will be described with reference to FIG. FIG. 4 is a partial cross-sectional view of the tubular member 21, the fixing member 30, and the diaphragm 10. In FIG. 4, the diaphragm 10 before being sandwiched between the cylinder member 21 and the fixing member 30 is illustrated by a two-dot chain line, and the diaphragm 10 after being sandwiched between the cylinder member 21 and the fixing member 30 is illustrated by a solid line.

  As shown in FIG. 4, the axial dimension (vertical direction in FIG. 4) of the peripheral edge portion 13 (two-dot chain line) of the diaphragm 10 before clamping is set to be larger than the axial interval between the pressing parts 24 and 31 after clamping. . Thereby, the peripheral edge portion 13 after being sandwiched is compressed and deformed in the axial direction by the pressing portions 24 and 31. Since elastic deformation (reduction in diameter) of the peripheral edge portion 13 inward in the radial direction is restricted by the inner peripheral wall portions 26 and 34, the peripheral edge portion 13 extends radially outward (right side in FIG. 4). The radial dimension of the peripheral edge portion 13 and the liquid sealing portion 14 is slightly larger than the radial dimension between the outer peripheral wall portion 25 and the inner peripheral wall portion 26 and the radial dimension between the outer peripheral wall portion 32 and the inner peripheral wall portion 34. Since it is set to be small, the liquid sealing portion 14 is pressed against the outer peripheral wall portions 25 and 32, respectively, as the peripheral edge portion 13 extends in the radial direction. Moreover, since the radial direction dimension is set smaller than the axial dimension, the peripheral part 13 can be compressed by a small axial load by the pressing parts 24 and 31.

  As a result, the space between the pressing portions 24 and 31 and the axial end surface of the peripheral portion 13 and the space between the liquid sealing portion 14 and the radially inner side surfaces of the outer peripheral wall portions 25 and 32 can be liquid-tight. Furthermore, since a part of the axial direction of the peripheral edge portion 13 protrudes in the radial direction over the entire circumference of the liquid sealing part 14, the liquid sealing part 14 comes into close contact with the outer peripheral wall parts 25 and 32. The area to which the pressing force is applied by the portion 14 can be reduced. As a result, sealing performance can be secured even with a small pressing force. Therefore, a stable sealing action can be secured against pressure fluctuations and vibrations of the liquid sealed in the liquid sealing chamber.

  Here, the crushing rate calculated from the axial dimension of the peripheral edge 13 before clamping and the axial interval between the pressing parts 24 and 31 after clamping is set to 8% or more and less than 30%. By setting the crushing rate to 8% or more and less than 30%, it is possible to achieve both the durability and the sealing performance of the peripheral portion 13. When the crushing ratio is smaller than 8%, the pressing force of the peripheral edge portion 13 and the liquid sealing portion 14 against the mating surface is reduced, and the sealing property tends to be lowered. When the crushing ratio is 30% or more, cracks due to deformation tend to occur in the peripheral portion 13 and the durability tends to decrease.

  Further, the size of the axial section of the peripheral edge portion 13 and the liquid sealing portion 14 before clamping, and the space surrounded by the pressing portions 24 and 31, outer peripheral wall portions 25 and 32, and inner peripheral wall portions 26 and 34 after clamping. The filling rate calculated from the size of the axial section of the (groove) is set to less than 90%. By setting the filling rate to less than 90%, it is possible to prevent the peripheral edge portion 13 and the liquid sealing portion 14 from being caught in the groove clearance (the mating surfaces of the outer peripheral wall portions 25 and 32) and to prevent the protrusion from proceeding. . When the filling rate is 90% or more, the peripheral portion 13 and the liquid sealing portion 14 are liable to protrude due to swelling or the like, and the applied load is likely to be lowered, so that the sealing performance is liable to be lowered.

  The axial dimension (thickness) of the neck portion 12 before clamping is set larger than the axial interval between the inner peripheral wall portions 26 and 34 after clamping. Thereby, the neck part 12 after clamping is pinched | interposed into the axial direction edge part of the inner peripheral wall parts 26 and 34 which oppose, and is compressed and deformed to an axial direction. Since the elastic deformation (extension) of the neck portion 12 toward the outer side in the radial direction is restricted by the elastic deformation of the peripheral edge portion 13, the neck portion 12 is pressed and held in the axial direction by the inner peripheral wall portions 26 and 34.

  Here, when the neck portion 12 is not pressed in the axial direction, when the main body portion 11 (see FIG. 1) reciprocates in the axial direction, the peripheral portion 13 is pulled radially inward via the neck portion 12. A force acts or the neck portion 12 moves (swings) in the axial direction. If it does so, there exists a possibility that the sealing performance of the peripheral part 13 may also fall.

  On the other hand, according to the present embodiment, by pressing the neck portion 12 in the axial direction, the tensile force acting on the peripheral portion 13 and the movement of the neck portion 12 in the axial direction can be suppressed. As a result, it can suppress that the sealing performance of the neck part 12, the peripheral part 13, and the liquid sealing part 14 falls.

Moreover, since the convex part 15 provided over the perimeter of the neck part 12 protrudes toward the axial direction lower side , the neck part 12 has an area where a pressing force is applied to the contact area by the convex part 15. Can be small. As a result, sealing performance can be secured even with a small pressing force.

  The convex portion 15 is not provided on the upper side surface in the axial direction of the neck portion 12 (surface close to the vibration isolation base 4), but is provided on the lower side surface in the axial direction (surface separated from the vibration isolation base 4). . The upper side surface in the axial direction of the neck portion 12 is continuous with the inner surface of the main body portion 11 with which the liquid sealed in the second liquid chamber L2 contacts, but the lower side surface in the axial direction of the neck portion 12 (the surface on which the convex portion 15 is provided). Is continuous with the outer surface of the main body 11 where no liquid is present. Although wrinkles in the circumferential direction may be formed at the root of the convex portion 15 pressed against the inner peripheral wall portion 34, no liquid is present on the surface (the outer surface of the diaphragm 10), so that the sealing property caused by the wrinkles is not present. Decrease can be prevented.

  Moreover, the liquid sealing part 14 is located in the radial direction outer side (right side of FIG. 4) of the peripheral part 13. When the liquid sealing portion 14 is located on the radially inner side of the peripheral edge portion 13, if a tensile force (vibration) radially inward acts on the peripheral edge portion 13 along with the axial reciprocation of the main body portion 11, the liquid sealing portion 14 The pressing force of the portion 14 against the mating surface (outer peripheral wall portions 25, 32) is likely to vary. If it does so, there exists a possibility that the sealing performance of the liquid sealing part 14 may fall. On the other hand, since the liquid sealing part 14 can be buffered by the peripheral part 13 by positioning the liquid sealing part 14 on the outer side in the radial direction of the peripheral part 13, fluctuations in the pressing force of the liquid sealing part 14 to the outer peripheral wall parts 25 and 32. Can be suppressed. Therefore, it is possible to suppress a decrease in the sealing action by the liquid sealing part 14.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, the case where the two liquid sealing parts 14 protrudingly provided by the peripheral part 13 of the diaphragm 10 were formed in the same radial direction dimension was demonstrated. On the other hand, in the second embodiment, of the two liquid sealing portions 14 and 114 protruding from the peripheral edge portion 13 of the diaphragm 110, one liquid sealing portion 114 has a radial dimension larger than that of the other liquid sealing portion 14. The case where it is set smaller will be described. Note that in the second embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 5A is a half sectional view of the diaphragm 110 of the liquid filled vibration isolator 101 according to the second embodiment, and FIG. 5B is a partially enlarged cross sectional view of the liquid filled vibration isolator 101.

  As shown in FIG. 5A, the diaphragm 110 is provided with liquid sealing portions 14 and 114 on the outer peripheral surface of the peripheral edge portion 13 formed in an annular shape over the entire circumference. The liquid sealing parts 14 and 114 are set to have different sizes in the radial direction. In the present embodiment, the radial dimension of the liquid sealing part 114 pressed against the partition 120 is set smaller than the radial dimension of the liquid sealing part 14 pressed against the fixing member 30.

  As shown in FIG. 5B, when the peripheral edge portion 13 is compressed in the axial direction by the pressing portions 24 and 31, the liquid sealing portions 14 and 114 are extended radially outward. As a result, the liquid sealing part 114 is pressed against the outer peripheral wall part 125, and the liquid sealing part 14 is pressed against the outer peripheral wall part 32.

  The outer peripheral wall portion 125 and the inner peripheral wall portion 26 are at least partially located on a virtual plane P3 that is orthogonal to the axis O and in which the liquid sealing portion 114 is positioned in the plane, and restricts the radial extension of the peripheral edge portion 13. Similarly, the outer peripheral wall portion 32 and the inner peripheral wall portion 34 are at least partially located on a virtual plane P2 that is orthogonal to the axis O and in which the liquid seal portion 14 is located in the plane, and the peripheral portion 13 is expanded in the radial direction. regulate. As a result, deformation of the peripheral portion 13 on the back side (radially inside, left side in FIG. 5B) of the liquid sealing portions 14 and 114 is restricted, so that the liquid sealing portions 14 and 114 are mated with the mating surface (outer peripheral wall portion 125. , 32) can be secured.

  Further, since the radial dimension of the liquid sealing part 114 pressed against the partition 120 is set smaller than the radial dimension of the liquid sealing part 14 pressed against the fixing member 30, the peripheral edge part 13 and the liquid sealing part 114 are It can be easily inserted between the inner peripheral wall portion 26 and the outer peripheral wall portion 125. Furthermore, the outer peripheral wall 125 against which the liquid seal 114 is pressed has an inner peripheral surface located on the radially inner side in a step shape with respect to the inner peripheral surface of the outer peripheral wall 32, so that the axis of the outer peripheral wall 32, 125 is It is possible to make it difficult for the liquid sealing portion 114 to be bitten between the end portions in the direction.

  Next, a third embodiment will be described with reference to FIG. In 1st Embodiment and 2nd Embodiment, the case where the liquid-seal parts 14 and 114 protrude in two places of the outer peripheral surface of the peripheral part 13 of the diaphragms 10 and 110 was demonstrated. On the other hand, in the third embodiment, a case will be described in which the outer periphery of the peripheral portion 213 of the diaphragm 210 is formed in a truncated cone shape so that one end in the axial direction of the peripheral portion 213 is configured as the liquid sealing portion 214. . Note that in the third embodiment, identical symbols are assigned to parts identical to those in the first embodiment and description below is omitted. FIG. 6A is a half sectional view of the diaphragm 210 of the liquid filled type vibration damping device 201 in the third embodiment, and FIG. 6B is a partially enlarged sectional view of the liquid filled type vibration damping device 201.

  As shown in FIG. 6A, the diaphragm 210 includes a peripheral portion 213 whose outer shape is formed in a truncated cone shape. The peripheral edge 213 has an outer peripheral surface on one end side in the axial direction (on the side separated from the anti-vibration base 4 (see FIG. 1), on the lower side in FIG. 6A) on the other end side in the axial direction (on the anti-vibration base 4 side, The outer diameter is set so as to gradually decrease toward the upper side of FIG. As a result, the outer peripheral surface on one end side in the axial direction of the peripheral edge portion 213 (side away from the vibration isolation base 4) functions as the liquid sealing portion 214. Since the outer peripheral surface of the peripheral edge portion 213 is gradually reduced in diameter from the one end side in the axial direction toward the other end side, it is possible to prevent the formation of an undercut portion on the outer peripheral surface of the peripheral edge portion 213. Therefore, the mold structure for vulcanizing and forming the diaphragm 210 can be simplified.

  As shown in FIG. 6B, when the peripheral portion 213 is compressed in the axial direction by the pressing portions 24 and 31, the liquid sealing portion 214 is extended radially outward. As a result, the liquid sealing portion 214 is pressed against the outer peripheral wall portion 32. The outer peripheral wall portion 32 and the inner peripheral wall portion 34 are at least partially located on a virtual plane P4 that is orthogonal to the axis O and in which the liquid seal portion 214 is positioned in the plane, and restricts the radial extension of the peripheral edge portion 213. As a result, the deformation of the peripheral portion 213 on the back side (radially inner side, left side in FIG. 6B) of the liquid sealing portion 214 is restricted, and therefore the force with which the liquid sealing portion 214 presses the mating surface (outer peripheral wall portion 32). Can be secured.

  Moreover, since the radial direction dimension of the peripheral part 213 pressed by the partition 20 is set smaller than the radial direction dimension of the peripheral part 213 pressed by the fixing member 30, the peripheral part 213 is made into the inner peripheral wall part 26 and an outer peripheral wall. It can be easily inserted between the portion 25. Further, since the liquid sealing portion 214 is formed on one end side in the axial direction of the peripheral edge portion 213, the liquid sealing portion is placed on the axial end portions (butting surfaces) of the outer peripheral wall portions 25 and 32 when the diaphragm 310 is inserted in the axial direction. Part 214 does not reach. Therefore, it is possible to prevent the liquid sealing portion 214 from being bitten between the axial end portions of the outer peripheral wall portions 25 and 32. Therefore, in the manufacturing process of the liquid-filled vibration isolator 201, it is possible to prevent the liquid sealing part 214 from being caught between the axial ends of the outer peripheral wall parts 25 and 32 and causing liquid leakage.

  Next, a fourth embodiment will be described with reference to FIG. In the first to third embodiments, the outer peripheral wall portions 25, 32, and 125 located on the radially outer sides of the peripheral edge portions 13 and 213 of the diaphragms 10, 110, and 210 are the partition bodies 20 and 120 and the fixing member. The case where it is constituted by 30 members (the mating surfaces of the outer peripheral wall portions 25, 32, 125 exist on the radially outer side of the peripheral edge portions 13, 213) has been described. On the other hand, in the fourth embodiment, a case where the outer peripheral wall portion 332 is formed by the fixing member 330 (the mating surface of the outer peripheral wall portion does not exist) will be described. Note that in the fourth embodiment, identical symbols are assigned to parts identical to those in the first embodiment and description below is omitted. FIG. 7A is a half sectional view of the diaphragm 310 of the liquid filled type vibration damping device 301 in the fourth embodiment, and FIG. 7B is a partially enlarged sectional view of the liquid filled type vibration damping device 301.

  As shown in FIG. 7A, the diaphragm 310 includes a peripheral portion 313 formed in a cylindrical shape, a liquid seal portion 314 having a triangular cross section projecting radially outward from the outer peripheral surface of the peripheral portion 313, and a peripheral portion. A neck portion 312 that is provided on the radially inner side of one end portion in the axial direction of the portion 313 (the lower side in FIG. 7A), and a neck portion 312 that is provided on the radially inner side of the neck portion 312 and the other axial end side (see FIG. 7 (a) is provided with a restricting portion 312a which is bent to the upper side and continues to the main body portion 11.

  As shown in FIG. 7B, the partition 320 (tubular member) is provided with an annular pressing portion 324 having a flat surface perpendicular to the axis O passing through the center of the partition 320 at the lower end. On the radially outer side of the pressing portion 324, a cylindrical outer peripheral wall portion 325 that protrudes downward in the axial direction (a direction away from the vibration isolation base 4 (see FIG. 1)) protrudes, and on the radially inner side of the pressing portion 324. Is provided with a cylindrical inner peripheral wall portion 326 that faces the outer peripheral wall portion 325 with a predetermined gap and extends downward in the axial direction.

  The fixing member 330 is arranged in a ring-shaped pressing portion 331 having a flat surface perpendicular to the axis O, and is positioned on the radially outer side of the pressing portion 331 and is erected toward the upper side in the axial direction (the direction approaching the vibration isolation base 4). And a cylindrical outer peripheral wall portion 332. In addition, the fixing member 330 has a cylindrical inner peripheral wall portion 334 that stands on the radially inner side of the pressing portion 331 and faces the outer peripheral wall portion 332 with a predetermined interval and extends upward in the axial direction. I have.

  The height of the inner peripheral wall portion 326 of the partition 320 is set to be lower than the height of the outer peripheral wall portion 332 of the fixing member 330. Further, the outer diameter of the outer peripheral wall portion 332 of the fixing member 330 is set to be approximately the same as the inner diameter of the outer peripheral wall portion 325 of the partition 320, and the outer diameter of the inner peripheral wall portion 334 of the fixing member 330 is 320 is set smaller than the inner diameter of the inner peripheral wall portion 326. Accordingly, the outer peripheral wall portion 332 of the fixing member 330 can be fitted into the outer peripheral wall portion 325 of the partition 320 and the axial end surface of the outer peripheral wall portion 332 of the fixing member 330 can be brought into contact with the pressing portion 324. As described above, the fixing member 330 can be press-fitted and fixed to the lower end portion of the partition 320.

  When the axial end surface of the outer peripheral wall portion 332 of the fixing member 330 is brought into contact with the pressing portion 324, an axial gap is formed between the inner peripheral wall portion 326 and the pressing portion 331, and between the pressing portions 324 and 331. An axial gap larger than the axial gap between the inner peripheral wall portion 326 and the pressing portion 331 is formed. A space between the pressing portions 324 and 331 is a space in which the peripheral portion 313 of the diaphragm 310 is accommodated, and a space between the inner peripheral wall portion 326 and the pressing portion 331 is a space in which the neck portion 312 of the diaphragm 310 is accommodated. Further, the restricting portion 312 a of the diaphragm 10 is accommodated in the radial gap between the inner peripheral wall portions 334 and 326.

  As shown in FIG. 7B, when the peripheral portion 313 is axially compressed by the pressing portions 324 and 331, the radially inner side expansion of the peripheral portion 313 is restricted by the inner peripheral wall portion 326. The liquid seal portion 314 is extended outward in the radial direction. As a result, the liquid sealing part 314 is pressed against the outer peripheral wall part 332. The outer peripheral wall portion 332 and the inner peripheral wall portion 326 are at least partially positioned on a virtual plane P5 that is orthogonal to the axis O and in which the liquid seal portion 314 is positioned in the plane, and restricts the radial extension of the peripheral edge portion 313. As a result, deformation of the peripheral edge portion 313 on the back side of the liquid seal portion 314 (radially inner side, left side in FIG. 7B) is restricted, so that the force with which the liquid seal portion 314 presses the outer peripheral wall portion 332 can be secured.

  In addition, by bringing the axial end surface of the outer peripheral wall portion 332 of the fixing member 330 into contact with the pressing portion 324 of the partition 320, a mating surface between the axial end surfaces of the outer peripheral wall portion is formed radially outward of the peripheral edge portion 313. It can be made not to exist. Since the axial interval between the mating surface of the pressing portion 324 and the outer peripheral wall portion 332 and the radial tip of the liquid sealing portion 314 can be secured, the liquid is applied to the mating surface (groove clearance) between the pressing portion 324 and the outer peripheral wall portion 332. It is possible to prevent the protrusion 314 from being bitten and the protrusion from proceeding.

  Moreover, since the restriction part 312a is provided in the diaphragm 310, when manufacturing the liquid filled type vibration isolator 301, the periphery of the diaphragm 310 is provided between the outer peripheral wall part 332 and the inner peripheral wall part 334 of the fixing member 330. The diaphragm 310 can be held on the fixing member 330 by fitting the portion 313, the neck portion 312, and the restriction portion 312 a. By pressing the fixing member 330 holding the diaphragm 310 into the partition 320, the diaphragm 310 can be fixed and sealed to the partition 320 at the same time.

  The diaphragm 310 fixed to the partition 320 is provided with a restricting portion 312a. Since the inner peripheral wall portion 334 is in close contact with the radially inner side of the restricting portion 312a, the neck portion 312 is reciprocated in the axial direction of the main body portion 11. Further, it is possible to prevent a tensile force inward in the radial direction from acting on the peripheral edge portion 313.

  Next, a fifth embodiment will be described with reference to FIG. In the first to fourth embodiments, the case where the liquid seal portions 14, 114, 214, 314 are formed on the peripheral portions 13, 213, 313 of the diaphragms 10, 110, 210, 310 has been described. On the other hand, in the fifth embodiment, a case where the liquid sealing portion 432a is formed on the fixing member 430 will be described. Note that in the fifth embodiment, identical symbols are assigned to parts identical to those in the first embodiment and description below is omitted. FIG. 8A is a half sectional view of the diaphragm 410 of the liquid filled type vibration damping device 401 in the fifth embodiment, and FIG. 8B is a partially enlarged sectional view of the liquid filled type vibration damping device 401.

  As shown in FIG. 8A, the diaphragm 410 has a peripheral portion 413 formed in a cylindrical shape. Therefore, it can prevent that the part used as an undercut is formed in the internal peripheral surface and outer peripheral surface of the peripheral part 413. FIG. Therefore, the mold structure for forming the diaphragm 410 by vulcanization can be simplified.

  As shown in FIG. 8B, the partition 420 (tubular member) is provided with an annular pressing portion 424 having a flat surface perpendicular to the axis O passing through the center of the partition 420 at the lower end. On the radially outer side of the pressing portion 424, a cylindrical outer peripheral wall portion 425 that protrudes downward in the axial direction (a direction away from the vibration isolation base 4 (see FIG. 1)) protrudes, and on the radially inner side of the pressing portion 424. Is provided with a cylindrical inner peripheral wall portion 426 that faces the outer peripheral wall portion 425 with a predetermined interval and extends downward in the axial direction.

  The fixing member 430 is provided with an annular pressing portion 431 having a flat surface perpendicular to the axis O, and is positioned on the radially outer side of the pressing portion 431 toward the upper side in the axial direction (direction approaching the vibration-isolating base 4). A cylindrical outer peripheral wall portion 432, and an exterior portion 433 which is positioned on the outer side in the radial direction of the outer peripheral wall portion 432 and is erected upward in the axial direction. Further, the outer peripheral wall portion 432 is provided with a liquid sealing portion 432a extending radially inward with a predetermined distance from the pressing portion 431. The liquid sealing part 432a is formed in an annular shape over the entire circumference of the inner peripheral surface of the outer peripheral wall part 432.

  The inner diameter of the exterior part 433 of the fixing member 430 is set to be approximately the same as the outer diameter of the outer peripheral wall part 425 of the partition body 420. Thereby, the outer peripheral wall part 425 of the partition body 420 can be press-fitted into the exterior part 433 of the fixing member 430. When the partition 420 is press-fitted into the fixing member 430 and the axial end portions of the outer peripheral wall portions 425 and 432 are abutted, an axial gap is formed between the inner peripheral wall portion 426 and the pressing portion 431, and the pressing portion 424. , 431 is formed with an axial gap larger than the axial gap between the inner peripheral wall portion 426 and the pressing portion 431. A space between the pressing portions 424 and 431 is a space in which the peripheral portion 413 of the diaphragm 410 is accommodated, and a space between the inner peripheral wall portion 426 and the pressing portion 431 is a space in which the neck portion 12 of the diaphragm 410 is accommodated.

  As shown in FIG. 8B, when the peripheral portion 413 is pressed and contracted in the axial direction by the pressing portions 424 and 431, the radially inner side expansion of the peripheral portion 413 is restricted by the inner peripheral wall portion 426. The peripheral edge 413 is extended radially outward. The extended peripheral edge portion 413 is pressed against the liquid seal portion 432a located on the radially outer side. The outer peripheral wall portion 432 and the inner peripheral wall portion 426 are at least partially located on a virtual plane P6 that is orthogonal to the axis O and in which the liquid seal portion 432a is positioned in the plane, and restricts radial expansion of the peripheral portion 413. As a result, deformation of the inner peripheral surface of the peripheral edge 413 is restricted, so that the force with which the peripheral edge 413 is pressed by the liquid sealing part 432a can be ensured. Accordingly, a pressing force can be applied to both end portions in the axial direction of the peripheral edge portion 413 and the outer peripheral surface, so that sealing performance can be ensured.

  Further, instead of providing a liquid seal portion having a triangular cross section or the like at the peripheral edge portion 413 of the diaphragm 410, a liquid seal portion 432a is provided on the fixing member 430. Therefore, in the manufacturing process of the liquid filled type vibration damping device 401, the diaphragm 410 is provided. It is possible to suppress the occurrence of a problem that the peripheral edge portion 413 is caught in the groove clearance when the partition member 420 and the fixing member 430 are sandwiched.

  Next, a sixth embodiment will be described with reference to FIGS. In the first to fifth embodiments, the fixing structure of the diaphragms 10, 110, 210, 310, and 410 has been described. In contrast, in the sixth embodiment, a structure for fixing the elastic partition film 530 disposed in the liquid enclosure is described. Note that in the sixth embodiment, identical symbols are assigned to parts identical to those in the first embodiment and description below is omitted. FIG. 9 is a sectional view in the axial direction of a liquid-filled vibration isolator 501 according to the sixth embodiment, and FIG. 10 is an enlarged cross-sectional view of the liquid-filled vibration isolator 501 showing the portion indicated by X in FIG. It is.

  As shown in FIG. 9, a partition body 520 having a tubular member 521 is internally provided on the lower end side of the second mounting member 3. The cylindrical member 521 supports the elastic partition film 530 that partitions the liquid sealing chamber formed between the vibration isolating base 4 and the diaphragm 10 into the first liquid chamber L3 and the third liquid chamber L5. A partition wall 528 that partitions the diaphragm 10 into a second liquid chamber L4 and a third liquid chamber L5 is disposed.

  The elastic partition film 530 is made of a thin disk-shaped rubber film and is disposed between a pair of upper and lower disk-shaped stopper plate portions 522 and 525 that limit excessive elastic deformation. The stopper plate portions 522 and 525 are formed with openings penetrating in the thickness direction for transmitting hydraulic pressure fluctuations. A first orifice 529 for communicating the first liquid chamber L3 and the second liquid chamber L4 is formed on the outer periphery of the stopper plate portions 522 and 525. A second orifice 528a that connects the second liquid chamber L4 and the third liquid chamber L5 is formed on the outer periphery of the partition wall 528. This liquid-filled vibration isolator 501 is configured as a so-called double orifice type liquid-filled vibration isolator that obtains a vibration-proof effect against vibrations in two different frequency ranges of shake vibration and idle vibration.

  Next, a fixing structure of the elastic partition film 530 will be described with reference to FIG. As shown in FIG. 10, the elastic partition film 530 includes a circular thin film-shaped main body portion 531 that reciprocates in the axial direction, an annular neck portion 532 that is located radially outside the main body portion 531, and the neck portion 532. And a peripheral edge portion 533 located on the outer side in the radial direction, which are integrally formed from a rubber-like elastic body. The axial dimension (thickness) of the neck part 532 is set larger than the axial dimension of the main body part 531, and the axial dimension of the peripheral part 533 is set larger than the axial dimension of the neck part 532. A liquid sealing portion 534 having a triangular cross section is provided at two locations on the outer peripheral surface of the peripheral edge portion 533 over the entire periphery.

  The stopper plate portions 522 and 525 are provided with inner peripheral wall portions 523 and 526 at the peripheral edges that extend toward opposite sides in the axial direction. Pressing portions 524 and 527 having annular flat surfaces extending from the end portions of the inner peripheral wall portions 523 and 526 toward the radially outer side and facing each other are provided. A cylindrical outer peripheral wall portion 528 extending in the axial direction from the pressing portion 527 is formed, and the end portions in the axial direction of the outer peripheral wall portion 528 abut against the pressing portion 524, so that the stopper plate portions 522 and 525 and the pressing portion 524 are formed. , 527 are kept at a predetermined interval.

  When the peripheral portion 533 is pressed and contracted in the axial direction by the pressing portions 524 and 527, the radially inner side expansion of the peripheral portion 533 is restricted by the inner peripheral wall portions 523 and 526, so that the peripheral portion 533 is radially outward. Stretched. The liquid sealing part 534 is pressed against the outer peripheral wall part 528 by extending the peripheral edge part 533. Since the area of the liquid sealing part 534 that presses the outer peripheral wall part 528 is smaller than the area of the outer peripheral surface of the peripheral edge part 533, the outer peripheral wall part by the liquid sealing part 534 is small even if the displacement amount in the radial direction of the peripheral edge part 533 is small. The pressing force of 528 can be increased. Moreover, the pressing force of the neck part 532 can also be secured by sandwiching the neck part 532 from above and below by the axial ends of the inner peripheral wall parts 523 and 526. As a result, a pressing force can be secured at both axial end portions of the neck portion 532 and the peripheral portion 533 and the radial end portion of the liquid sealing portion 534, and the sealing performance can be improved.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  In addition, each of the above-described embodiments is a configuration in which a part or a plurality of parts of the configuration of the other embodiments is added to the embodiment or the configuration of the embodiment is within the scope of the present invention. The embodiment may be modified and configured by exchanging with a part or a plurality of parts. For example, replacing the seal structure of the diaphragms 10, 110, 210, 310, 410 described in the first to fifth embodiments with the seal structure of the elastic partition film 530 described in the sixth embodiment Of course it is possible.

  In each of the above-described embodiments, the case where the diaphragms 10, 110, 210, 310, 410 are fixed to the axial ends of the partition bodies 20, 120, 320, 420, 520 has been described. Absent. For example, a support member configured separately from the partitions 20, 120, 320, 420, and 520 is provided inside the second mounting member 3, and the diaphragms 10, 110, 210, 310, and 410 are fixed to the support member. Of course it is possible.

  In each of the above-described embodiments, the case where the liquid sealing portions 14, 114, 214, 314, 432a, 534 are provided on the outer side in the radial direction of the peripheral edge portions 13, 213, 313, 413, 533 has been described. It is not something that can be done. A liquid provided on the radially inner side of the peripheral edge portions 13, 213, 313, 413, and 533 is provided with an outer peripheral wall portion that restricts the displacement of the peripheral wall portion in the radially outer direction and an inner peripheral wall portion that faces the outer peripheral wall portion. Naturally, it is possible to ensure the sealing performance by the sealing portion.

  Thus, by providing the liquid sealing portion on the radially inner side of the peripheral edge portions 13, 213, 313, 413, and 533, it is possible to suppress a decrease in the sealing action by the liquid sealing portion. That is, when the liquid seal portion is located on the radially outer side of the peripheral portions 13, 213, 313, 413, 533, the peripheral portions 13, 13 are reciprocated along with the axial reciprocation of the diaphragms 10, 110, 210, 310, 410. When a tensile force (vibration) radially inward acts on 213, 313, 413, and 533, the pressing force of the liquid seal portion against the mating surface is likely to fluctuate. If it does so, there exists a possibility that the sealing performance of a liquid seal part may fall. On the other hand, by placing the liquid sealing portion on the radially inner side of the peripheral edge portions 13, 213, 313, 413, 533, the tensile force to the inner side in the radial direction acting on the liquid sealing portion is used as the pressing force of the liquid sealing portion. Can be added. Accordingly, it is possible to suppress a decrease in the sealing action due to the liquid sealing portion. Accordingly, it is possible to suppress a decrease in the sealing action due to the liquid sealing portion.

  Moreover, although each said embodiment demonstrated the case where the virtual planes P1-P5 which pass a liquid seal part exist in the position orthogonal to the axis line O which passes along the axial center of the 2nd attachment member 3, it is not necessarily restricted to this. It is not a thing. The virtual planes P <b> 1 to P <b> 5 are positions where the virtual planes P <b> 1 to P <b> 5 intersect with the axis O passing through the axial center of the second mounting member 3, as long as it is possible to regulate the radial expansion of one surface of the peripheral edge opposite to the surface on which the liquid seal portion is formed. If it is in. By setting the virtual planes P <b> 1 to P <b> 5 to exist at positions intersecting with the axis O passing through the axial center of the second mounting member 3, the degree of freedom in designing the liquid-filled vibration isolator can be improved.

  In the fifth embodiment, the case where the liquid sealing portion 432a is provided in the fixing member 430 has been described. However, the present invention is not limited to this, and the partition 420 side (or the partition body 420 and another member are configured). Of course, it is possible to provide a liquid-sealed portion on the support member.

  In the first to fifth embodiments, the case where the first liquid chamber L1 and the second liquid chamber L2 are partitioned by the elastic partition film 22 (rubber-like elastic body) has been described. However, the present invention is not limited to this. Of course, instead of the elastic partition film 22, it is possible to use a partition plate made of a rigid material such as a metal or a synthetic resin.

  In the sixth embodiment, the case where the liquid sealing chamber is formed between the vibration isolating base 4 and the diaphragm 10 (rubber-like elastic body) has been described. However, the present invention is not necessarily limited to this, and the diaphragm 10 is not limited to this. Instead, it is naturally possible to use a liquid chamber forming member made of a rigid material such as metal or synthetic resin.

  Although not described in the above embodiment, it is naturally possible to provide an air chamber between a bracket (not shown) to which the second mounting member 3 is attached and the diaphragms 10, 110, 210, 310, 410. It is. The air chamber may be communicated with the atmosphere or an airtight chamber. When the air chamber is an airtight chamber, it is naturally possible to use a control type liquid-filled vibration isolator that adjusts the pressure of the air chamber from the outside.

1, 101, 201, 301, 401, 501 Liquid-sealed vibration isolator 2 First mounting member 3 Second mounting member 4 Vibration isolating base 10, 110, 210, 310, 410 Diaphragm (liquid chamber forming member)
12, 312, 532 Neck part 13, 213, 313, 413, 533 Peripheral part 14, 114, 214, 314, 432a, 534 Liquid seal part 15 Convex part 20, 120, 320, 420, 520 Partition 23 Orifice 24, 324, 424, 524 Pressing portion 25, 125, 425 Outer peripheral wall (part of the peripheral wall)
26,523 Inner peripheral wall (part of the opposing wall)
31, 331, 431, 527 Pressing portion 32, 132, 332, 432 Outer peripheral wall (part of the peripheral wall)
34,425,526 Inner peripheral wall (part of the opposing wall)
312a Restriction part 326 Inner peripheral wall part (opposing wall part)
334 Inner peripheral wall 528 Outer peripheral wall (peripheral wall)
528a Second orifice (orifice)
529 First orifice (orifice)
530 Elastic partition film O Axis L1, L3 First liquid chamber (part of liquid enclosure)
L2, L4 Second liquid chamber (part of liquid enclosure)
L5 3rd liquid chamber (part of liquid enclosure)
P1, P2, P3, P4, P5, P6 Virtual plane

Claims (6)

A first mounting member, a cylindrical second mounting member, a vibration isolating base that connects the second mounting member and the first mounting member and is formed of a rubber-like elastic body; and the second mounting member. A diaphragm that is attached and forms a liquid sealing chamber between the vibration isolating base and a rubber-like elastic body, a partition that partitions the liquid sealing chamber into a plurality of liquid chambers, and a space between the plurality of liquid chambers In a liquid-filled vibration isolator comprising an orifice that communicates with
A peripheral portion configured to be integral with the main body portion, the axial dimension being set larger than the axial direction size of the main body portion of the diaphragm reciprocating in the axial direction;
It is arranged inside the second mounting member, and presses one end side in the axial direction and the other end side in the axial direction of the peripheral edge portion to compress and deform the peripheral edge portion in the axial direction while expanding and deforming in the radial direction. A pair of pressing parts;
A peripheral wall portion in which the entire circumference of at least one of the outer peripheral portion or the inner peripheral portion of the peripheral edge portion that is stretched and deformed in the radial direction by being pressed by the pair of pressing portions is closely contacted;
An opposing wall portion that is located on the radially inner side or radially outer side of the circumferential wall portion and that faces the circumferential wall portion at a predetermined interval;
The peripheral edge portion or the peripheral wall portion includes one or a plurality of liquid sealing portions that are partly protruded in the radial direction over the entire circumference and are liquid-tight.
In the state in which the peripheral edge portion is compressed and deformed in the axial direction by the pair of pressing portions, a gap is provided between a part of the peripheral edge portion and the peripheral wall portion. A first mounting member, a cylindrical second mounting member, a vibration isolating base that connects the second mounting member and the first mounting member and is formed of a rubber-like elastic body; and the second mounting member. A liquid chamber forming member that is attached and forms a liquid sealing chamber between the vibration isolating substrate, a partition that partitions the liquid sealing chamber into a plurality of liquid chambers, and an orifice that communicates between the plurality of liquid chambers. The partition body is a liquid-filled vibration isolator having an elastic partition film composed of a rubber-like elastic body,
A peripheral part configured to be integrated with the main body part, the axial dimension being set larger than the axial dimension of the main body part of the elastic partition membrane reciprocating in the axial direction, and being positioned radially outside the main body part;
It is arranged inside the second mounting member, and presses one end side in the axial direction and the other end side in the axial direction of the peripheral edge portion to compress and deform the peripheral edge portion in the axial direction while expanding and deforming in the radial direction. A pair of pressing parts;
A peripheral wall portion in which the entire circumference of at least one of the outer peripheral portion or the inner peripheral portion of the peripheral edge portion that is stretched and deformed in the radial direction by being pressed by the pair of pressing portions is closely contacted;
An opposing wall portion that is located on the radially inner side or radially outer side of the circumferential wall portion and that faces the circumferential wall portion at a predetermined interval;
The peripheral edge portion or the peripheral wall portion includes one or a plurality of liquid sealing portions that are partly protruded in the radial direction over the entire circumference and are liquid-tight.
In the state in which the peripheral edge portion is compressed and deformed in the axial direction by the pair of pressing portions, a gap is provided between a part of the peripheral edge portion and the peripheral wall portion.   In a state before the peripheral edge portion is compressed and deformed in the axial direction by the pair of pressing portions, the radial dimension of the peripheral edge portion and the liquid sealing portion is larger than the radial dimension between the peripheral wall portion and the opposing wall portion. Is set to be small, and in a state where the peripheral portion is compressed and deformed in the axial direction by the pair of pressing portions, the radial extension of the peripheral portion is restricted by the peripheral wall portion and the opposing wall portion. The liquid-filled vibration isolator according to claim 1 or 2. The peripheral wall portion is located on the radially outer side of the peripheral edge portion,
The opposing wall portion is located on the radially inner side of the peripheral edge portion,
The outer peripheral part of the peripheral part is in close contact with the peripheral wall part,
The peripheral wall portions protrude from the pair of pressing portions and are axially opposed to each other, or protrude from one of the pair of pressing portions and contact the other of the pair of pressing portions,
The said liquid seal part presses the said peripheral wall part or the said peripheral part avoiding the mating surface of the said surrounding wall parts, or the mating surface of the said surrounding wall part and the said press part, The said peripheral part is characterized by the above-mentioned. The liquid-filled vibration isolator according to any one of the above. An annular neck portion that is located between the main body portion and the peripheral portion and is configured integrally with the main body portion and the peripheral portion,
Said neck portion, and the fluid-filled chamber with projecting surface or al-axis direction of the opposite side, provided with a convex portion provided over the entire circumference of the neck portion,
5. The liquid-filled type prevention according to claim 1, wherein the liquid-filled type prevention is pressed in an axial direction by an axial end portion of the opposing wall portion or the peripheral wall portion located radially inside the peripheral edge portion. Shaker. An annular neck portion that is located between the main body portion and the peripheral edge portion and is configured integrally with the main body portion and the peripheral edge portion;
A regulating part located between the neck part and the main body part and configured integrally with the neck part and the main body part;
An inner peripheral wall portion that is in close contact with the radially inner side of the restriction portion,
The said neck part is pressed in the axial direction by the axial direction edge part of the said opposing wall part or the said surrounding wall part located in the radial inside of the said peripheral part, The Claim 1 to 5 characterized by the above-mentioned. Liquid-filled vibration isolator.

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