JP2007127250A - Liquid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-sealed vibration control device equipped with two orifices capable of preventing the generation of noise caused by the cavitation of a main liquid chamber. <P>SOLUTION: The liquid-sealed vibration control device 10 is configured such that a first mounting member 12 and a second mounting member 14 are coupled to each other by a vibration control base 16, a diaphragm 26 is installed confronting the vibration control base so as to form a liquid sealing chamber 32 between the members, and the liquid sealing chamber is partitioned by a partitioning part 30 into a main liquid chamber 34 and an auxiliary liquid chamber 36, the two liquid chambers are put in a manner of mutual communication through the orifices, wherein the partitioning part 30 is composed of a partitioning plate member 40 to be partitioned into the main liquid chamber 34 and the auxiliary liquid chamber 36, a ring-shaped member 42 which is secured to the second mounting member 14 by at peripheral edge 42C and whose opening peripheral edge 42B is arranged confronting the peripheral edge 40A of the partitioning plate member in the axial direction, and a ring-shaped rubber part 44 interposed between the peripheral edge 40A of the partitioning plate member and the opening peripheral edge 42B of the ring-shaped member for coupling and supporting the partitioning plate member 40 with and on the ring-shaped member 42 in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator used for vibration-proofing a vibration generator such as an automobile engine.

  2. Description of the Related Art Conventionally, a liquid-filled vibration isolator is used as a mount for supporting a vibration generating body such as an automobile engine so that the vibration is not transmitted to the vehicle body.

Such a liquid-filled vibration isolator generally has a vibration isolating base in which a first attachment member attached to a vibration generating body side such as an engine and a second attachment member attached to a support side such as a vehicle body frame are made of a rubber elastic body. Further, a diaphragm made of a rubber film is mounted on the second mounting member so as to face the vibration isolating base, and an inner chamber between the two is made a liquid sealing chamber, and the liquid sealing chamber is a partition portion. Is divided into a main liquid chamber on the vibration-proof base side and a sub liquid chamber on the diaphragm side, and the both liquid chambers are communicated with each other through an orifice (see, for example, Patent Documents 1 to 3 below).
JP 2000-230600 A JP 2003-49890 A JP 2002-81488 A

  In the above-described liquid-filled vibration isolator, during normal vibration input, the vibration damping function and the vibration insulation function are fulfilled by the liquid column resonance effect caused by the liquid flow at the orifice and the vibration damping effect of the vibration isolating substrate. When vibration is input, the vibration isolator itself may be an abnormal sound source and transmitted to the passenger compartment.

  Such abnormal noise is generated by cavitation in the liquid chamber. Cavitation is caused by clogging of the orifice when a large vibration is input to the vibration isolator, resulting in excessive negative pressure in the main liquid chamber, which is less than the saturated vapor pressure of the sealed liquid. This phenomenon is caused by the generation of bubbles. And the impact sound when the bubble generated in this way disappears becomes an abnormal sound and is transmitted to the outside.

  An object of the present invention is to provide a liquid-filled vibration isolator capable of preventing the generation of abnormal noise due to such cavitation.

  A liquid-filled vibration isolator according to the present invention includes a first mounting member, a second mounting member having a cylindrical portion, and both mounting members interposed between the first mounting member and the second mounting member. A vibration isolating base made of a rubber elastic body to be bonded, and a diaphragm made of a rubber film that is disposed opposite to the anti-vibration base and forms a liquid sealing chamber between the anti-vibration base and the anti-vibration base inside the cylindrical portion; A liquid enclosure comprising: a partition that divides the liquid enclosure chamber into a main liquid chamber on the vibration isolation base side and a sub liquid chamber on the diaphragm side; and an orifice that communicates between the main liquid chamber and the sub liquid chamber. In the vibration isolator, the partition portion is fixed to the second mounting member at an outer peripheral edge portion of the partition plate member that partitions the main liquid chamber and the sub liquid chamber, and an opening peripheral edge portion of the partition plate member is An annular member disposed opposite to the peripheral edge in the axial direction, the peripheral edge of the partition plate member, and the Is interposed between the opening edge of the Jo member is made of an annular rubber portion for coupling the two.

  In the liquid-filled vibration isolator of the present invention, when a negative pressure exceeding a predetermined level is generated in the main liquid chamber due to excessive vibration input, the partition plate member supported via the annular rubber portion The deformation causes displacement to the main liquid chamber side, thereby reducing an increase in the volume of the main liquid chamber and reducing the negative pressure in the main liquid chamber, so that the occurrence of cavitation in the main liquid chamber can be reduced. Even if cavitation occurs in the main liquid chamber, the partition plate member facing the main liquid chamber is coupled to the annular member and further to the second mounting member via the annular rubber portion. Is attenuated in the annular rubber portion, and abnormal noise transmitted to the outside can be reduced.

  On the other hand, at the time of normal vibration input, that is, when the negative pressure in the main liquid chamber is small, the partition plate member coupled and supported in the axial direction via the annular rubber portion is not substantially displaced, and therefore, as in the conventional case, The vibration damping function and the vibration insulation function are fulfilled by the liquid column resonance effect caused by the liquid flow at the orifice and the vibration damping effect of the vibration isolation base.

  In the liquid filled type vibration damping device of the present invention, the peripheral edge portion of the partition plate member is disposed on the main liquid chamber side with respect to the opening peripheral edge portion of the annular member, and on the inner side of the annular rubber portion. A second annular rubber portion is provided between the peripheral edge portion of the partition plate member and the opening peripheral edge portion of the annular member, and the second annular rubber portion is bonded to one of the partition plate member and the annular member. In addition, it is preferable that the other is provided in contact with non-adhesion.

  Generally, the pressure change in the main liquid chamber is larger on the positive pressure side due to the compressive load than on the negative pressure side, so that only the annular rubber portion suppresses the displacement of the partition plate member during a normal compressive load, and cavitation occurs. It is difficult to ensure the displacement of the partition plate member at the time of negative pressure so as not to occur. Therefore, when the second annular rubber portion is provided as described above, at the time of negative pressure, only the outer annular rubber portion acts to displace the partition plate member by its elastic deformation, thereby reducing the occurrence of cavitation. At the time of compressive load, displacement of the partition plate member can be suppressed by the annular rubber portion and the second annular rubber portion inside thereof, and the function of the orifice can be ensured.

  In this case, if the partition plate member includes a through hole that allows the gap between the annular rubber portion and the second annular rubber portion to communicate with the main liquid chamber, the following effects can be obtained. That is, when a negative pressure of a predetermined level or more is generated in the main liquid chamber and the partition plate member is displaced to the main liquid chamber side, the end surface on the non-bonding side of the second annular rubber portion is in contact with the partition plate member or the annular member The liquid in the sub liquid chamber flows into the main liquid chamber from the gap through the through hole. Thereby, since the negative pressure in the main liquid chamber is relieved, the occurrence of cavitation in the main liquid chamber can be reduced.

  Furthermore, in this case, when the annular rubber portion has a larger axial dimension than the second annular rubber portion, the following effects are exhibited. That is, when the rubber shrinks after vulcanizing the partition, between the annular rubber part and the second annular rubber part having a constant shrinkage rate, the annular rubber part having a higher axial dimension has a shrinkage length in the axial direction. Is big. Therefore, due to the difference in the contraction length, the second annular rubber portion is compressed between the partition plate member and the annular member. Therefore, the second annular rubber portion is separated from the partition plate by a negative pressure during normal vibration input. The liquid can be prevented from leaking away from the member or the annular member.

  In the liquid-filled vibration isolator of the present invention, the annular member includes an orifice groove opened outwardly between the outer peripheral edge and the opening peripheral edge, and the orifice groove and the second attachment The orifice may be formed between the cylindrical portion of the member. Alternatively, the partition plate member is fitted and mounted so as to be slidable in the axial direction with respect to the inner peripheral surface of the cylindrical portion of the second mounting member, and the peripheral portion of the partition plate member is opposed to the annular portion. An orifice groove opened outward may be formed between the member and the annular rubber portion, and the orifice may be formed between the orifice groove and the cylindrical portion of the second mounting member.

  As described above, with the liquid-filled vibration isolator of the present invention, it is possible to prevent the generation of abnormal noise due to cavitation at the time of excessive vibration input while ensuring vibration isolation performance at the time of normal vibration input. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show a liquid-filled vibration isolator 10 according to a first embodiment of the present invention. The liquid-filled vibration isolator 10 is an engine mount for supporting the engine of an automobile and preventing the engine vibration from being transmitted to the vehicle body frame, and includes an upper first attachment member 12 attached to the engine side, A lower second attachment member 14 attached to the vehicle body frame side, and a vibration isolating base 16 made of a rubber elastic body that is interposed between the attachment members 12 and 14 and couples them are provided.

  The first mounting member 12 is made of a rigid material such as metal and is disposed above the axial center of the second mounting member 14. A bolt hole 18 is provided on the upper surface of the first mounting member 12, and an engine side member (not shown) is fastened and fixed to the bolt hole 18.

  The second mounting member 14 is formed in a bottomed cylindrical shape from a rigid material such as metal. In this example, the second attachment member 14 includes a cylindrical portion 20 to which the vibration-proof base 16 is vulcanized and bonded, and a bowl-shaped bottom member 22 attached to the lower end opening thereof. A bolt 24 is provided so as to be fixed to a body frame side member (not shown) with the bolt 24.

  The anti-vibration base 16 has a substantially truncated cone shape, the first mounting member 12 is embedded in the upper portion thereof, and the inner peripheral surface of the upper end portion of the cylindrical portion 20 is vulcanized and bonded to the lower end portion. .

  A diaphragm 26 made of a flexible rubber film is provided inside the second mounting bracket 14 so as to face the vibration-proof base 16, and the diaphragm 26 is attached to the lower end opening of the tubular portion 20. ing. Further, a partition portion 30 is fitted on the inner periphery of the cylindrical portion 20 via a rubber layer 28 formed integrally with the vibration isolation base 16. In this way, the inner chamber between the vibration isolating substrate 16 and the diaphragm 26 is formed as a liquid sealing chamber 32 in which incompressible liquid such as water or ethylene glycol is sealed. Thus, the vibration isolating base 16 is divided into an upper main liquid chamber 34 that forms a part of the chamber wall, and a diaphragm 26 is divided into a lower sub liquid chamber 36 that forms a part of the chamber wall. Further, an air chamber 38 is formed between the diaphragm 26 and the bottom member 22.

  The partition portion 30 is arranged on the outer peripheral portion of the partition plate member 40 that divides the main liquid chamber 34 and the sub liquid chamber 36 up and down, and is annularly fixed to the second mounting member 14. The member 42 includes a first annular rubber portion 44 that couples and supports the partition plate member 40 to the annular member 42 in the axial direction.

  The partition plate member 40 is a disk-shaped member made of a rigid material such as metal or resin, and is disposed horizontally in the cylindrical portion 20 of the second mounting member 14. The partition plate member 40 is arranged on the main liquid chamber 34 side with respect to the annular member 42, and the upper surface faces the main liquid chamber 34 and the lower surface faces the sub liquid chamber 36.

  The annular member 42 is a member for supporting the partition plate member 40 in the cylindrical portion 20 and is made of a rigid material such as metal or resin, and includes an opening 42A in the center. And the opening peripheral part 42B makes a horizontal ring-plate shape, and is arrange | positioned facing the peripheral part 40A of the partition plate member 40 at a predetermined distance in the axial direction. Specifically, the lower surface of the peripheral edge portion 40A and the upper surface of the open peripheral edge portion 42B are arranged such that the peripheral edge portion 40A of the partition plate member 40 is arranged on the main liquid chamber 34 side with respect to the open peripheral edge portion 42B of the annular member 42. Opposite. Further, the annular member 42 is fixed to the caulking joint portion 46 between the cylindrical portion 20 and the bottom member 22 of the second mounting member 14 together with the auxiliary metal fitting 27 at the peripheral portion of the diaphragm 26 at the outer peripheral portion 42C.

  Further, the annular member 42 is provided with an orifice groove 48 having a U-shaped cross section opened outwardly between the outer peripheral edge portion 42C and the opening peripheral edge portion 42B. An orifice 50, which is a liquid flow path, communicates between the main liquid chamber 34 and the sub liquid chamber 36 between the orifice groove 48 and the rubber layer 28 provided on the inner peripheral surface of the second mounting member 14. Is formed. The orifice 50 is connected to the main liquid chamber 34 via an opening 50A provided on the upper surface side of the orifice groove 48, and is connected to the sub liquid chamber 36 via an opening 50B provided on the lower surface side of the orifice groove 48. (See FIGS. 1 and 2).

  The opening peripheral portion 42B of the annular member 42 is formed in an inward flange shape from the inner peripheral surface of the cylindrical wall portion 42D that forms the orifice groove 48, and the outer peripheral portion 42C is the lower side of the orifice groove 48. It is formed in a flange shape from the portion outward in the radial direction. Further, the partition plate member 40 is disposed in an inner recess surrounded by the cylindrical wall portion 42D.

  The first annular rubber portion 44 is interposed between the opposing surfaces of the peripheral edge portion 40A of the partition plate member 40 and the opening peripheral edge portion 42B of the annular member 42. In this embodiment, the first annular rubber portion 44 has a cylindrical shape extending in the axial direction. Therefore, the partition plate member 40 and the annular member 42 are coupled in the axial direction. The first annular rubber portion 44 is vulcanized and bonded to both the partition plate member 40 and the annular member 42. In this example, the peripheral edge portion 40A of the partition plate member 40 is embedded in the upper portion of the first annular rubber portion 44. Has been.

  The first annular rubber portion 44 does not substantially displace the partition plate member 40 toward the main liquid chamber 34 due to the negative pressure in the main liquid chamber 34 at the time of normal vibration input, and enters the main liquid chamber 34 due to excessive vibration. The elastic modulus, thickness, and the like are set so that the partition plate member 40 can be displaced upward, that is, toward the main liquid chamber 34 side by being elastically deformed when a predetermined negative pressure or more is generated. Here, the negative pressure set as the negative pressure equal to or higher than the predetermined value is preferably a negative pressure (negative pressure having a small absolute value) smaller than the negative pressure when cavitation occurs in the main liquid chamber 34.

  On the radially inner side of the first annular rubber portion 44, a second annular rubber portion 52 is provided that is interposed between the peripheral edge portion 40A of the partition plate member 40 and the opening peripheral edge portion 42B of the annular member 42. The second annular rubber portion 52 is made of a rubber elastic body integrated with the first annular rubber portion 44, and is formed on the inner peripheral side of the first annular rubber portion 44 with a gap 56 formed by the straight portion 54. . The second annular rubber portion 52 has a cylindrical shape extending in the axial direction, and the lower surface thereof is vulcanized and bonded to the opening peripheral portion 42B of the annular member 42, and the upper surface is connected to the peripheral portion 40A of the partition plate member 40. It is formed so as to be in a contact state without being vulcanized and bonded.

  The partition plate member 40 is provided with a through hole 58 that allows the gap 56 between the first annular rubber portion 44 and the second annular rubber portion 52 to communicate with the main liquid chamber 34. As shown in FIGS. 2 and 3, the through holes 58 are provided at a plurality of locations in the circumferential direction, and are provided at four locations in this example. The straight portion 54 is provided in correspondence with the through hole 58. Therefore, the first annular rubber portion 44 and the second annular rubber portion 52 are connected to each other by connecting portions 60 provided at four locations in the circumferential direction. Has been. The connecting part 60 may be vulcanized or non-adhered to the peripheral edge part 40A of the partition plate member 40, but in this example, the connecting part 60 is non-adhesive like the second annular rubber part 52. Yes.

  A stepped portion 62 is provided on the peripheral edge portion 40A of the partition plate member 40, and the outer peripheral end side 40B is formed higher than the central side 40C. That is, the outer peripheral end side 40B of the stepped portion 62 to which the first annular rubber portion 44 is bonded is closer to the opening peripheral portion 42B of the annular member 42 than the center side 40C of the stepped portion 62 with which the second annular rubber portion 52 abuts. It is formed so as to be separated. As a result, the axial dimension H1 of the first annular rubber portion 44 is larger than the axial dimension H2 of the second annular rubber portion 52. The partition portion 30 is integrally formed by vulcanization molding. At this time, if the first annular rubber portion 44 is formed higher in this way, the first annular rubber portion is formed when the rubber is contracted after vulcanization. No. 44 has a larger contraction length in the axial direction. Therefore, a compressive force resulting from this difference in contraction length acts on the second annular rubber portion 52, whereby the second annular rubber portion 52 is formed in a state of pressing the partition plate member 40.

  With the liquid-filled vibration isolator 10 according to the present embodiment configured as described above, when excessive vibration is input to the vibration isolator at the time of starting the engine or traveling on a rough road, the orifice 50 becomes clogged. A negative pressure exceeding a predetermined level is generated in the main liquid chamber 34. As a result, as shown in FIG. 4, the partition plate member 40 facing the main liquid chamber 34 is displaced so as to be pulled toward the main liquid chamber 34 by the elastic deformation of the first annular rubber portion 44. Volume increase is reduced. Further, due to the displacement of the partition plate member 40, the upper surface of the second annular rubber portion 52 on the non-adhesion side is separated from the partition plate member 40, and the liquid L in the auxiliary liquid chamber 36 is mainly passed through the through hole 58 from the gap. It flows into the liquid chamber 34. Therefore, the negative pressure in the main liquid chamber 34 is relieved, and the occurrence of cavitation in the main liquid chamber 34 can be suppressed.

  Even if cavitation occurs in the main liquid chamber 34, the partition plate member 40 facing the main liquid chamber 34 is coupled to the outer second mounting member 14 via the first annular rubber portion 44. The abnormal noise due to cavitation is attenuated in the rubber portion 44, and the abnormal noise transmitted to the outside can be reduced.

  On the other hand, at the time of normal vibration input, that is, when the negative pressure in the main liquid chamber 34 is small, the partition plate member 40 coupled and supported in the axial direction via the first annular rubber portion 44 is not substantially displaced, Therefore, the partition part 30 can be made to act as a mere rigid partition. More specifically, when the partition plate member 40 is axially coupled and supported to the annular member 42 as described above, the partition plate member 40 is displaced by compression and tension of the first annular rubber portion 44. . Therefore, the partition plate member 40 is less likely to be displaced than the configuration in which the partition plate member is displaced and supported by a force in the shearing direction by being coupled and supported by the outer peripheral fixing member via the rubber elastic body. The displacement of the partition plate member 40 at the time of vibration input is restricted. Therefore, at the time of normal vibration input, the vibration damping function and the vibration insulation function can be exhibited by the liquid column resonance action due to the liquid flow at the orifice 50 and the vibration damping effect of the vibration isolation base.

  In particular, in the present embodiment, by providing the second annular rubber portion 52, the partition plate member 40 is displaced downward with respect to the input in the compression direction of the main liquid chamber 34 at the time of normal vibration input. Is suppressed, and the function of the orifice 50 can be better secured. Further, since the second annular rubber portion 52 is formed in a state of pressing the partition plate member 40, the second annular rubber portion 52 is separated from the partition plate member 40 by the negative pressure at the time of normal vibration input, so that the liquid is discharged. Leakage can be suppressed.

  As described above, according to the present embodiment, it is possible to suppress abnormal noise caused by cavitation at the time of excessive vibration input while securing vibration isolation performance at the time of normal vibration input. Further, in this embodiment, since the partition plate member 40 is not fitted and mounted on the inner peripheral surface of the second mounting member 14 as in the embodiments described later, the partition plate member 40 and the second mounting member 14 side. There is also an advantage that there is no wear or friction with the rubber layer 28 and the durability is excellent.

  In the above embodiment, the second annular rubber part 52 is bonded to the annular member 42 side and is not bonded to the partition plate member 40 side. On the contrary, the second annular rubber portion 52 is bonded to the partition plate member 40 side. The structure may be non-adhering to the annular member 42 side.

  In the above embodiment, the axial dimensions of the first annular rubber portion 44 and the second annular rubber portion 52 are made different in order to prevent liquid leakage in the second annular rubber portion 52 during normal vibration input. Although the method is adopted, in order to prevent such a leak, the second annular rubber portion 52 only needs to be held in a compressed state between the partition plate member 40 and the annular member 42, and other methods can be adopted. . For example, after the vulcanization molding of the partition part 30, only the second annular rubber part 52 may be compressed by pressing the inner peripheral side of the partition plate member 40 or the annular member 42.

  5 and 6 relate to the second embodiment, and the configuration of the partition portion 30 is different from that of the above-described embodiment. In this example, both the partition plate member 40 and the annular member 42 are made of a metal plate press-formed product, and the orifice groove 48 is not formed by the annular member 42 alone.

  In this example, the partition plate member 40 is formed to have substantially the same diameter as the inner peripheral surface of the cylindrical portion 20 of the second mounting member 14 and slides in the axial direction with respect to the inner peripheral surface of the cylindrical portion 20. The fitting is possible. Then, an orifice groove 48 having a U-shaped cross section opened outwardly between the peripheral edge portion 40A of the partition plate member 40, the annular member 42 opposed to the peripheral edge portion 40, and the cylindrical first annular rubber portion 44. The orifice 50 is formed between the orifice groove 48 and the cylindrical portion 20 of the second mounting member 14.

  Specifically, the outer peripheral end of the partition plate member 40 is covered with a cover rubber 64 that extends integrally from the first annular rubber portion 44, and the rubber layer 28 is attached to the inner peripheral surface of the cylindrical portion 20. It contacts with no gap. Thereby, while ensuring the sealing property of the orifice 50, the sliding property with respect to the cylindrical part 20 of the partition plate member 40 is ensured, and the vertical displacement of the partition plate member 40 at the time of excessive negative pressure is facilitated. Yes.

  With this configuration, in the liquid-filled vibration isolator of this example, the rigid body facing the main liquid chamber 34 is only the partition plate member 40, and the partition plate member 40 is a first annular member made of a rubber elastic body. Since it is couple | bonded with the 2nd outer attachment member 14 via the rubber | gum part 44, the transmission to the exterior of the abnormal noise by cavitation can be reduced further. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof will be omitted.

  7 and 8 relate to the third embodiment, and the configuration of the partition plate member 40 of the partition portion 30 is different from that of the second embodiment. That is, in this example, the step part 62 is not provided in the partition plate member 40, so that the partition plate member 40 is flat as a whole, and the first annular rubber portion 44 and the second annular rubber portion 52. Are set to have the same axial dimension. Others are the same as those in the second embodiment, and a description thereof will be omitted.

  9 and 10 relate to the fourth embodiment, and are different from the third embodiment in that the second annular rubber portion 52 is not provided in the partition portion 30. That is, in this example, the partition plate member 40 is supported only by the first annular rubber portion 44 with respect to the annular member 42, and the second annular rubber portion 52 does not exist on the inner periphery thereof. Therefore, the through hole 58 is not formed in the partition plate member 40. Therefore, even if an excessive negative pressure acts on the main liquid chamber 34 and the partition plate member 40 is displaced upward, the auxiliary liquid chamber There is no inflow of liquid from 36 to the main liquid chamber 34, and there is no negative pressure relaxation effect. However, in this case as well, the increase in volume of the main liquid chamber 34 is reduced by the upward displacement of the partition plate member 40, and the negative pressure in the main liquid chamber 34 is relieved. can get. Others are the same as those in the third embodiment, and a description thereof will be omitted.

  In the above embodiment, the liquid-filled vibration isolator having both a main liquid chamber and a sub liquid chamber and having a single orifice has been described. However, the present invention relates to the main liquid chamber and the first sub liquid. It can be applied to a liquid-filled vibration isolator having three chambers, a chamber and a second sub-liquid chamber, and having two orifices communicating with each other. It can be applied to the device.

  The liquid-filled vibration isolator of the present invention can suppress the generation of abnormal noise caused by cavitation at the time of excessive vibration input while ensuring vibration isolation performance at the time of normal vibration input. It can be suitably used as an anti-vibration device for various vehicles such as engine mounts and body mounts.

It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on the 1st Embodiment of this invention. It is a top view of the partition part of the vibration isolator. It is the III-III sectional view taken on the line of FIG. It is a principal part expanded sectional view at the time of the effect | action of the vibration isolator. It is a semi-sectional view of the partition part in the 2nd Embodiment of this invention. It is a principal part expanded sectional view of the liquid filling type vibration isolator which concerns on 2nd Embodiment. It is a semi-sectional view of the partition part in the 3rd Embodiment of this invention. It is a principal part expanded sectional view of the liquid filling type vibration isolator which concerns on 3rd Embodiment. It is a semi-sectional view of the partition part in the 4th Embodiment of this invention. It is a principal part expanded sectional view of the liquid filling type vibration isolator which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator, 12 ... 1st attachment member, 14 ... 2nd attachment member, 16 ... Anti-vibration base | substrate, 20 ... Cylindrical part, 26 ... Diaphragm, 30 ... Partition part, 32 ... Liquid enclosure chamber, 34 ... Main liquid chamber, 36 ... Secondary liquid chamber, 40 ... Partition plate member, 40A ... Peripheral part, 42 ... Ring member, 42B ... Opening peripheral part, 42C ... Outer peripheral part, 44 ... First annular rubber part (annular rubber) Part), 48 ... orifice groove, 50 ... orifice, 52 ... second annular rubber part, 58 ... through hole, H1 ... axial dimension of the first annular rubber part, H2 ... axial dimension of the second annular rubber part

Claims (6)

A first mounting member, a second mounting member having a cylindrical portion, a vibration isolating base made of a rubber elastic body that is interposed between the first mounting member and the second mounting member and couples both mounting members; A diaphragm made of a rubber film disposed opposite to the vibration isolating substrate and forming a liquid enclosing chamber with the anti-vibration substrate inside the tubular portion, and the liquid enclosing chamber on the main side of the vibration isolating substrate. In a liquid-filled vibration isolator comprising a partition section that partitions a liquid chamber and a sub liquid chamber on the diaphragm side, and an orifice that allows communication between the main liquid chamber and the sub liquid chamber.
The partition portion is fixed to the second mounting member at an outer peripheral edge portion with a partition plate member that partitions the main liquid chamber and the sub liquid chamber, and an opening peripheral edge portion is axially provided on the peripheral edge portion of the partition plate member. A liquid-filled vibration isolator comprising an annular member disposed opposite to each other, and an annular rubber portion that is interposed between a peripheral edge portion of the partition plate member and an opening peripheral edge portion of the annular member and couples the two. .   The peripheral edge of the partition plate member is disposed on the main liquid chamber side with respect to the opening peripheral edge of the annular member, and the peripheral edge of the partition plate member and the annular member on the inner side of the annular rubber portion A second annular rubber portion is provided between the peripheral edge portion of the opening, and the second annular rubber portion is bonded to one of the partition plate member and the annular member, and is in non-adhesive contact with the other. The liquid-filled vibration damping device according to claim 1, wherein the liquid-filled vibration damping device is provided.   3. The liquid filled type vibration damping device according to claim 2, wherein the partition plate member includes a through hole for communicating a gap between the annular rubber portion and the second annular rubber portion with the main liquid chamber.   4. The liquid filled type vibration damping device according to claim 3, wherein the annular rubber portion has a larger axial dimension than the second annular rubber portion.   The annular member includes an orifice groove opened outward between the outer peripheral edge portion and the opening peripheral edge portion, and the orifice is provided between the orifice groove and the cylindrical portion of the second mounting member. The liquid-filled vibration isolator according to claim 1, wherein the liquid-filled vibration isolator is formed. The partition plate member is fitted and mounted so as to be slidable in the axial direction with respect to the inner peripheral surface of the cylindrical portion of the second mounting member, and the peripheral portion of the partition plate member and the annular member opposed thereto, An orifice groove opened outward is formed between the annular rubber portion, and the orifice is formed between the orifice groove and the cylindrical portion of the second mounting member. The liquid-filled vibration isolator according to any one of 1 to 4.

Images