JP2011169428A - Vibration control device - Google Patents

Abstract

An anti-vibration device that can be manufactured using a mold having a simple structure and can be attenuated in two directions.
SOLUTION: Second main liquid chambers 40A and 40B are arranged outside the first main liquid chamber 28 in the radial direction. The first dent 34 constituting the first main liquid chamber 28 and the second dents 42A and 42B constituting the second main liquid chambers 40A and 40B are opened in the same direction. Thereby, compared with the structure where the opening direction of 2nd hollow part 42A, 42B differs from the opening direction of the 1st hollow part 34, the structure of a metal mold | die becomes simple.
[Selection] Figure 1

Description

  The present invention relates to a fluid-filled vibration isolator that prevents transmission of vibration from a member that generates vibration, and more particularly, to a vibration isolator that is suitably used for an engine mount of an automobile.

  For example, in a vehicle such as a passenger car, an anti-vibration device serving as an engine mount is disposed between an engine serving as a vibration generating unit and a vehicle body serving as a vibration receiving unit. In the vibration isolator, when the inner cylinder and the outer cylinder vibrate in the axial direction due to vibration generated from the engine, the vibration is attenuated by liquid movement between the first main liquid chamber and the sub liquid chamber. ing. For example, in the vibration isolator described in Patent Document 1, in addition to the above structure, two pressure receiving liquid chambers (liquid chambers) are arranged in a direction (axial direction) perpendicular to the axial direction, and these pressure receiving liquids This is a so-called two-way damping vibration isolator that communicates the chamber with the sub liquid chamber and attenuates the vibration in the axial direction by moving the liquid between the plurality of liquid chambers.

  Incidentally, in the shape of the elastic body in the vibration isolator described in Patent Document 1, a recess is formed on the upper surface in the axial direction, and a recess constituting the first pressure receiving liquid chamber is also formed on the lower surface. Furthermore, a dent constituting the second pressure-receiving liquid chamber and a dent constituting the air chamber are also formed in the axial direction. For this reason, the structure of the mold when forming the elastic body is complicated, and it is possible to manufacture a vibration isolator capable of two-way damping using a mold having a simpler structure. desired.

JP 2006-125617 A

  An object of the present invention is to obtain a vibration isolator that can be manufactured by using a mold having a simple structure and capable of two-way attenuation in consideration of the above fact.

  In the first aspect of the present invention, the first mounting member connected to one of the vibration generating portion and the vibration receiving portion, the second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first An elastic body that is disposed between the mounting member and the second mounting member and connects the first mounting member and the second mounting member, and the opposite of the vibration generating unit or the vibration receiving unit connected to the first mounting member And at least a part of the inner wall is formed of the elastic body and is filled with liquid, and is more than the outer edge of the second mounting member when viewed in the main vibration direction due to the relative movement of the vibration generating portion and the vibration receiving portion. A first main liquid chamber located on the inner side, a sub liquid chamber in which a liquid is enclosed and a part of the inner wall is constituted by a diaphragm so that the internal volume can be expanded and contracted according to a change in liquid pressure; and the first main liquid A partition member separating the chamber and the sub-liquid chamber, and the first main body A first restricting passage that allows liquid to move between the chamber and the sub liquid chamber, and at least a part of the inner wall of the first restricting passage as viewed in the main vibration direction, the elastic body outside the first main liquid chamber. A second main liquid chamber configured by a recess formed in the body and enclosing a liquid; a lid member covering the recess; and between the second main liquid chambers or between the second main liquid chamber and the sub liquid chamber. A second restriction passage that allows movement of liquid between the liquid chamber and the opening direction of the first main liquid chamber is the same as the opening direction of the recesses constituting the second main liquid chamber Has been.

  In this vibration isolator, when vibration is transmitted from the vibration generating portion to one of the first mounting member and the second mounting member, the vibration isolator is disposed between the first mounting member and the second mounting member to connect them. The elastic body is elastically deformed. Then, the vibration is absorbed by the vibration absorbing action based on the internal friction or the like of the elastic body, and the vibration transmitted to the vibration receiving portion side is reduced.

  Liquids are sealed in the first main liquid chamber and the sub liquid chamber, respectively, and the movement of the liquid between the first main liquid chamber and the sub liquid chamber is made possible by the first restriction passage. Accordingly, when the internal volume of the first main liquid chamber changes with the elastic deformation of the elastic body, a part of the liquid moves between the sub liquid chambers, so that the input vibration (in the main amplitude direction) can be absorbed. .

  Further, in this vibration isolator, the second main liquid chamber is constituted by the concave portion provided in the elastic body, and the liquid is also sealed in the second main liquid chamber. The movement of the liquid between the second main liquid chambers or between the second main liquid chamber and the sub liquid chamber is enabled by the second restriction passage. Therefore, when the first mounting member and the second mounting member vibrate in a direction orthogonal to the main vibration (main vibration orthogonal direction), a plurality of second main liquid chambers are provided between the second main liquid chambers (in this configuration, a plurality of second main liquid chambers are provided). ) Or between the second main liquid chamber and the sub liquid chamber (in this configuration, one or more second main liquid chambers are provided). Thereby, the input vibration can be absorbed also in the main vibration orthogonal direction.

  In this vibration isolator, a part of the elastic body is a surface that forms at least a part of the first main liquid chamber, and the elastic body also has a recess that forms the second main liquid chamber. Is formed. The opening direction of the first main liquid chamber (the direction in which the surface forming the first main liquid chamber is open) and the opening direction of the recesses forming the second main liquid chamber are the same. Therefore, if a mold that is demolded in the opening direction is used at the time of manufacture, it has a surface that constitutes a part of the inner wall of the first main liquid chamber without using a mold having a complicated structure. A vibration isolator having an elastic body with a recess can be manufactured.

  According to a second aspect of the present invention, in the first aspect of the present invention, a deformation suppressing member that suppresses deformation of the elastic body in the outer direction is disposed further outside the second main liquid chamber.

  Therefore, when the first mounting member and the second mounting member vibrate in the main vibration orthogonal direction, the deformation suppressing member suppresses deformation of the elastic body in the outer direction, so that the internal volume of the second main liquid chamber It is possible to more reliably generate the change.

  According to a third aspect of the present invention, in the second aspect of the present invention, the deformation suppressing member is provided as a part of the second mounting member.

  Therefore, the deformation suppressing member is integrated with the second mounting member. For this reason, compared with the structure which made the deformation | transformation suppression member and the 2nd attachment member into a different body, a number of parts decreases. Moreover, the position shift of a 2nd attachment member and a deformation | transformation suppression member can also be suppressed.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the partition wall member is inserted into the concave portion to partially reduce the sectional area of the opening portion of the concave portion. An insertion member is formed.

  As described above, when the insertion member is inserted into the recess, the cross-sectional area of the opening of the recess is partially reduced, and a so-called stop is configured. In addition, at least a part of the second restriction passage can be configured by this restriction. That is, at least a part of the second restriction passage can be easily configured by inserting the insertion member of the recess.

  In the invention of claim 5, in the invention of any one of claims 1 to 4, the partition member and the lid plate member are integrated into a partition member.

  Thus, by integrating the partition wall member and the cover plate member into the partition member, the number of parts is reduced as compared with the configuration in which the partition wall member and the cover plate member are separated.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the second main liquid chamber is in the main vibration direction in a cross section along the input direction of the main vibration. It is formed to be long.

  That is, since the second main liquid chamber is long in the main vibration direction, it is relatively short in the main vibration orthogonal direction. For this reason, the second main liquid chamber is easily deformed in the direction orthogonal to the main vibration, and the change in the internal volume due to the deformation is increased.

  Since the present invention is configured as described above, a vibration isolator capable of two-way attenuation can be manufactured using a mold having a simple structure.

It is a perspective view which fractures | ruptures and shows the structure of the vibration isolator which concerns on 1st Embodiment of this invention along an axial direction. It is a perspective view which fractures | ruptures and shows the structure of the vibration isolator which concerns on 1st Embodiment of this invention in the fracture surface different from FIG. 1 along an axial direction. It is a perspective view which fractures | ruptures and shows the elastic body, outer cylinder, and attachment board which comprise the vibration isolator which concerns on 1st Embodiment of this invention along an axial direction. It is the IV-IV sectional view taken on the line of FIG. 1 which shows the vibration isolator which concerns on 1st Embodiment of this invention. It is a perspective view which shows the partition member which comprises the vibration isolator which concerns on 1st Embodiment of this invention. It is a perspective view which shows the partition member which comprises the vibration isolator which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows roughly the manufacturing process of the vibration isolator which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows roughly the manufacturing process of the vibration isolator of a 1st comparative example. It is explanatory drawing which shows roughly the manufacturing process of the vibration isolator of a 2nd comparative example.

  1 and 2 show a vibration isolator 12 according to a first embodiment of the present invention. The vibration isolator 12 is used as an engine mount in an automobile, for example. An engine serving as a vibration generating unit is supported on a vehicle body serving as a vibration receiving unit. In the drawings, symbol S indicates the axial center of the vibration isolator 12. The direction along the axial center S is the axial direction of the vibration isolator 12, and the direction orthogonal to the axial center S (axial direction) is prevented. The radial direction of the vibration device 12 is assumed. The axial direction coincides with the input direction (main vibration direction) of the main vibration to the vibration isolator 12.

  As shown in detail in FIGS. 1 and 2, the vibration isolator 12 includes an outer cylinder 14 formed in a substantially cylindrical shape and a mounting plate 16 formed in a substantially disk shape. An intermediate tube portion 14B is formed at the center in the axial direction of the outer tube 14, and a flange portion 14F bent outward in the radial direction is formed at a position below the intermediate tube portion 14B. Further, below the flange portion 14F, a large-diameter lower portion 14L having a larger diameter than the intermediate cylinder portion 14B is formed. Further, a diameter-expanded portion 14T having a diameter gradually increased upward is formed at a position above the intermediate cylinder portion 14B.

  A plurality of (for example, three) leg portions (not shown) extend radially outward from the outer cylinder 14, and the vibration isolator 12 is attached to the vehicle body by inserting the bolts into the bolt insertion holes at the tips of the leg portions. Attached to. Instead of (or in combination with) the legs, a bracket may be fixed to the outer cylinder 14 and the outer cylinder 14 may be attached to the vehicle body using the bracket.

  The mounting plate 16 has one or a plurality of positioning projections 22 protruding upward from a predetermined position. The positioning convex portion 22 is used to position and attach the engine. The vibration isolator 12 of the present embodiment also has an effect of attenuating vibration in the axial direction. However, in the state where no vibration is input, the center of the mounting plate 16 is the axis of the outer cylinder 14. Match.

  A rubber elastic body 24 is disposed between the mounting plate 16 and the outer cylinder 14, and the mounting plate 16 and the outer cylinder 14 are connected by the rubber elastic body 24. The rubber elastic body 24 has a truncated cone-shaped rubber main body 24B that is extended from the lower surface portion of the mounting plate 16 toward the enlarged diameter portion 14T and the intermediate cylinder portion 14B of the outer cylinder 14 and gradually expanded in diameter. ing. From the lower end of the rubber main body portion 24B, a substantially cylindrical rubber cylindrical portion 24C located on the radially inner side of the intermediate cylinder portion 14B of the outer cylinder 14 is extended. Further, the rubber elastic body 24 has a thin-walled covering rubber portion 24D located on the radially outer side of the intermediate cylinder portion 14B. A rubber elastic body 24 is vulcanized and bonded to the mounting plate 16 and the outer cylinder 14.

  As shown in detail in FIG. 3, the rubber elastic body 24 is formed with a first recess 34 having a shape recessed upward from the lower surface side in the center in the axial direction. The first recess 34 has a constant inner diameter at a predetermined height from the lower surface of the rubber elastic body 24, but the inner diameter gradually decreases upward from the middle. In a state where no vibration is input, as shown in FIGS. 1 and 2, when the first depression 34 is viewed in the axial direction (the direction of the arrow A <b> 1), the center is the axis S of the vibration isolator 12. Match.

  One or a plurality of (two in this embodiment) second dent portions 42A and 42B are formed on the radially outer side of the first dent portion 34 so as to be recessed upward from the lower surface side. As can be seen from FIG. 4, the second indentations 42 </ b> A and 42 </ b> B are formed in an arc shape that curves along the circumferential direction of the rubber elastic body 24, and have a predetermined width W <b> 1 in the radial direction. Further, as can be seen from FIG. 3, the axial direction has a depth D1 longer than at least the width W1. That is, the second dents 42A and 42B have a shape that is elongated in this direction (main vibration direction) when viewed in a cross section along the axial direction (main vibration direction). These 2nd hollow parts 42A and 42B become the "recessed part" which concerns on this invention.

  As shown in FIGS. 1 and 2, a diaphragm 18 is attached below the outer cylinder 14, and a cover body 44 is attached below the diaphragm 18. A partition member 32 is disposed between the rubber elastic body 24 and the diaphragm 18, and a substantially annular spacer 20 is interposed between the partition member 32 and the diaphragm 18.

  The diaphragm 18 is a film-like member that is curved so that a central portion thereof is convex downward, and forms a sub liquid chamber 30 between the diaphragm 18 and the partition member 32 as described later. The sub liquid chamber 30 is expanded and contracted by the deformation of the diaphragm 18 so that the volume thereof is changed.

  The cover body 44 is curved so that the central portion is downward and protrudes larger than the central portion of the diaphragm 18, and covers the diaphragm 18 from below. The outer edge portion of the cover body 44 is folded upward so as to wrap the outer edge portion of the diaphragm 18 from below, and further crimped, whereby the cover body 44 and the diaphragm 18 are integrated.

  The partition member 32 includes an upper partition member 32A disposed in contact with the rubber elastic body 24, a lower partition member 32B disposed in contact with the lower surface of the upper partition member 32A, and an upper partition member 32A and a lower partition member 32B. And a partition disk 46 sandwiched between these members. The upper partition member 32A and the lower partition member 32B above and below the partition disk 46 are formed with through holes 32H penetrating them in the thickness direction (vertical direction).

  As shown in detail in FIGS. 5 and 6, the upper partition member 32 </ b> A includes an orifice disc portion 32 </ b> D formed in a substantially disc shape and a substantially upright standing from the outer periphery of the orifice disc portion 32 </ b> D. A cylindrical portion 32E having a cylindrical shape. A flange portion 32F extending outward in the radial direction is formed from the outer edge portion of the lower surface of the cylindrical portion 32E.

  As shown in FIGS. 1 and 2, a first main liquid chamber 28 is configured between the upper partition member 32 </ b> A and the partition disk 46 and the first recess 34 of the rubber elastic body 24. . The first main liquid chamber 28 is filled with a liquid such as ethylene glycol or silicon oil. Further, a sub liquid chamber 30 is formed between the lower partition member 32 </ b> B and the partition disk 46 and the diaphragm 18. Similarly to the first main liquid chamber 28, the sub liquid chamber 30 is filled with a liquid such as ethylene glycol or silicon oil. In particular, since a part of the sub liquid chamber 30 is constituted by the diaphragm 18, the deformation of the diaphragm 18 brings the sub liquid chamber 30 to a state close to atmospheric pressure (so that inflow and outflow of fluid occur). Is possible. As can be seen from the above, the central portion of the upper partition member 32A and the lower partition member 32B and the partition disk 46 constitute a “partition wall member” according to the present invention.

  A spiral first orifice 36 is formed in the orifice disc portion 32D of the partition member 32. The upper end of the first orifice 36 communicates with the first main liquid chamber 28 through the communication hole 38, and the lower end of the first orifice 36 is opened downward through the through-hole 33 formed in the lower partition member 32B. 30. As a result, the first orifice 36 is a flow path that allows the liquid to move between the first main liquid chamber 28 and the sub liquid chamber 30. In particular, the length and cross-sectional area of the first orifice 36 as a flow path are set corresponding to vibration in a specific frequency range (for example, shake vibration), and the first main liquid chamber 28, the sub liquid chamber 30, It is adjusted so that this vibrational energy can be absorbed by the liquid movement.

  Further, when the relative fluctuation of the pressure in the first main liquid chamber 28 and the sub liquid chamber 30 occurs at a high frequency that cannot be absorbed by the fluid movement through the first orifice 36, the pressure fluctuation is caused by the deformation of the partition disk 46. To ease. That is, the partition disk 46 also functions as a membrane.

  The peripheral portion of the upper partition member 32A covers each of the second recess portions 42A and 42B from the lower side of the rubber elastic body 24, and the upper partition member 32A and the second recess portions 42A and 42B of the rubber elastic body 24 are covered with each other. In the middle, second main liquid chambers 40A and 40B are formed. Each of the second main liquid chambers 40A and 40B is filled with a liquid such as ethylene glycol and silicon oil, like the first main liquid chamber 28 and the sub liquid chamber 30. That is, in the vibration isolator 12 of the present embodiment, the first main liquid chamber 28 is radially inward of the outer edge portion of the outer cylinder 14 (substantially the axial center) when viewed in the axial direction (main vibration direction). The second main liquid chambers 40 </ b> A and 40 </ b> B are configured radially outside the first main liquid chamber 28. And the 1st hollow part 34 which comprises a part of inner wall of the 1st main liquid chamber 28, and the 2nd hollow part 42A, 42B which comprises a part of inner wall of 2nd main liquid chamber 40A, 40B. Are open in the same direction (downward in this embodiment).

  The peripheral portions of the upper partition member 32A and the lower partition member 32B constitute a “lid plate member” according to the present invention. That is, the partition member 32 is formed by integrating the “partition wall member” at the center portion and the “lid plate member” at the peripheral portion.

  An insertion wall 50 having a shape that enters each of the second recessed portions 42A and 42B is provided upright from the peripheral edge portion of the upper partition member 32A. The thickness T1 of the insertion wall 50 is made equal to the width W1 of the second depressions 42A and 42B, but a thin portion 50S that is partially thin is formed at the center of the insertion wall 50. The insertion wall 50 constitutes an “insertion member” according to the present invention, and partially reduces the cross-sectional area of the opening portions of the second depressions 42A and 42B.

  The lower partition member 32B is also formed with a through hole 54 penetrating in the thickness direction at a position corresponding to the thin portion 50S. The thin portion 50S and the through hole 54 constitute second orifices 52A and 52B that allow fluid movement between the second main liquid chambers 40A and 40B and the sub liquid chamber 30, respectively. The lengths and cross-sectional areas of the second orifices 52A and 52B as flow paths are set corresponding to vibrations in a specific frequency range, and the liquid movement between the second main liquid chambers 40A and 40B and the sub liquid chamber 30 is performed. Therefore, the vibration energy is adjusted so as to be absorbed. In particular, the set frequency in the second orifices 52A and 52B is higher than the set frequency in the first orifice 36.

  As shown in FIG. 1, a thin-walled thin coating portion 24 </ b> E is configured by a rubber elastic body 24 on the radially outer side of the second main liquid chambers 40 </ b> A and 40 </ b> B (second depressions 42 </ b> A and 42 </ b> B). When the intermediate cylinder part 14B and the enlarged diameter part 14T of the outer cylinder 14 are located further radially outward of the thin coating part 24E, and the second main liquid chambers 40A and 40B are deformed in the radial direction, the rubber cylinder part The second main liquid chambers 40A and 40B are reliably deformed by supporting the 24C (thin coating portion 24E) from the radially outer side. That is, the outer cylinder 14, particularly the intermediate cylinder portion 14 </ b> B and the enlarged diameter portion 14 </ b> T are “deformation suppressing members” according to the present invention.

  Next, the operation of the vibration isolator 12 of this embodiment will be described.

  When the engine is operated, vibration from the engine is transmitted to the rubber elastic body 24 through the mounting plate 16. At this time, the rubber elastic body 24 acts as a vibration absorber, and the input vibration is absorbed by a damping action due to internal friction or the like accompanying the deformation of the rubber elastic body 24.

  Here, the main vibrations input from the engine to the vibration isolator 12 are vibrations acting in the axial direction of the vibration isolator 12 and acting in a direction perpendicular to the axis of the vibration isolator 12 (direction orthogonal to the axis S). (Actually, a vibration obtained by combining these vibrations acts on the vibration isolator 12). The rubber elastic body 24 can be absorbed by a damping action due to internal friction or the like regardless of the direction of the input vibration.

  In particular, in the vibration isolator 12 of the present embodiment, the first main liquid chamber 28 communicates with the sub liquid chamber 30 through the first orifice 36. Therefore, when axial vibration is input to the mounting plate 16 from the engine side, the rubber elastic body 24 is elastically deformed in the axial direction and the internal volume of the first main liquid chamber 28 is expanded or contracted. As a result, the liquid flows between the first main liquid chamber 28 and the sub liquid chamber 30 through the first orifice 36 in synchronization with the input vibration.

  Here, the path length and the cross-sectional area of the first orifice 36 are set so as to correspond to the frequency of a specific input vibration. Therefore, a resonance phenomenon (liquid column resonance) occurs in the liquid that flows between the first main liquid chamber 28 and the sub liquid chamber 30 through the first orifice 36. The input vibration in the axial direction can be effectively absorbed by the pressure change and viscous resistance of the liquid accompanying the liquid column resonance.

  In the vibration isolator 12 of the present embodiment, the second main liquid chambers 40A and 40B are communicated with the sub liquid chamber 30 through the second orifices 52A and 52B. Therefore, when vibration in the axial direction is input to the mounting plate 16 from the engine side, the rubber elastic body 24 is elastically deformed in the axial direction and the internal volumes of the second main liquid chambers 40A and 40B are expanded and contracted. Thereby, the liquid flows between the second main liquid chambers 40A and 40B and the sub liquid chamber 30 through the second orifices 52A and 52B in synchronization with the input vibration. The second main liquid chambers 40A and 40B are longer in the main vibration direction and relatively shorter in the main vibration orthogonal direction. For this reason, the second main liquid chambers 40A and 40B are easily deformed in the main vibration orthogonal direction, and the internal volume can be greatly changed by the deformation.

  In particular, in the vibration isolator 12 of the present embodiment, the intermediate cylinder portion 14B and the enlarged diameter portion 14T of the outer cylinder 14 are located on the radially outer side of the second main liquid chambers 40A and 40B. Compared with a configuration in which the 14B and the enlarged diameter portion 14T are not supported on the radially outer side, the second main liquid chambers 40A and 40B are more reliably deformed in the radial direction.

  The path length and the cross-sectional area in the second orifices 52A and 52B are also set so as to correspond to the frequency of a specific input vibration. Therefore, a resonance phenomenon (liquid column resonance) occurs in the liquid that flows between the second main liquid chambers 40A and 40B and the sub liquid chamber 30 through the second orifices 52A and 52B. Due to the pressure change and viscous resistance of the liquid accompanying this liquid column resonance, the input vibration in the axial direction can be effectively absorbed.

  As described above, in the structure in which the second main liquid chambers 40A and 40B communicate with the sub liquid chamber 30 through the second orifices 52A and 52B, for example, the first orifice 36 and the second orifices 52A and 52B, respectively. By appropriately setting the flow path cross-sectional area and the flow path length, it is possible to cause a peak of the loss coefficient at two locations, a relatively low frequency area and a high frequency area.

  As can be seen from the above description, in the present embodiment, it is possible to attenuate the vibration in both directions of the above-described axial vibration and axial vibration so that the engine is supported on the vehicle body. Furthermore, in the present embodiment, in addition to this, when the vibration isolator 12 is manufactured, it can be manufactured using a mold having a simple structure.

  When the vibration isolator 12 is actually manufactured, the mounting plate 16 and the outer cylinder 14 are arranged in advance in a predetermined position in the mold, and unvulcanized or semi-cured rubber is placed in the mold. There is a case where it is injected and vulcanized (at this time, the mounting plate 16 and the outer cylinder 14 are vulcanized and bonded). Here, as shown in FIG. 3, in the vibration isolator 12 of the present embodiment, the first depression 34 constituting the first main liquid chamber 28 is formed so as to open on the lower surface of the rubber elastic body 24, Furthermore, the second recesses 42A and 42B constituting the second main liquid chambers 40A and 40B are also formed so as to open on the lower surface of the rubber elastic body 24. As described above, since the opening directions of the two concave portions (the first hollow portion 34 and the second hollow portion 42A, 42B) are the same, as shown in FIG. 7, it corresponds to the lower portion of the rubber elastic body 24 at the manufacturing stage. The demolding direction of the mold 62 to be performed can be set in the arrow U1 direction. With respect to the upper part of the rubber elastic body 24, the two molds 64 and 66 can be set so that they can be removed in the directions of arrows U2 and U3, respectively.

  FIG. 8 shows, as a first comparative example, a rubber elastic body 124, a mounting plate 116, and an outer cylinder 14 having a structure in which two second indentations 142A and 142B are open on the upper surface side. In the first comparative example, the second dents 42A and 42B opened on the lower surface side are not formed, but the other structure is the same as that of the embodiment of the present invention.

  In the first comparative example, since the opening direction of the first dent portion 34 and the second dent portions 142A and 142B are opposite to each other, the mold is removed in the opening direction (arrow U1 direction) of the first dent portion 34. A mold 162 and a mold 164 to be removed in the opening direction (arrow U4 direction) of the second depressions 142A and 142B are necessary. Further, the shape of the rubber elastic body 124 causes the axial direction (arrow U2 direction and arrow). At least two molds 166A and 166B are required to be removed in the (U3 direction). As described above, in the first comparative example, at least four molds are necessary.

  In addition, in the first comparative example, it is necessary to form the through hole 116H in the mounting plate 116 in order to form the second depressions 142A and 142B, which increases the number of manufacturing steps. When the vibration isolator is configured, a member that closes the through hole 116H is also required.

  FIG. 9 shows a rubber elastic body 224 and an outer cylinder 14 having a structure in which two second indentations 242A and 242B are opened in a direction perpendicular to the axis and opposite to each other as a second comparative example. . In the second comparative example, in order to expand and contract the second main liquid chamber constituted by the second depressions 242A and 242B with certainty, the rubber elastic body 224 has a rubber lid on the upper side of the second depressions 242A and 242B. 218 is formed and an upper recess 220 is formed. In the second comparative example, a metal intermediate cylinder 226 is disposed outside the rubber elastic body 224 to maintain the shape of the rubber elastic body 224.

  Also in the second comparative example, a mold 262 that is demolded in the opening direction (arrow U1 direction) of the first recess 34 and a mold 264 that is demolded in the opening direction (arrow U4 direction) of the upper recess 220 are necessary. In addition, at least two molds 266A and 266B are required to be removed in the opening direction (arrow U2 direction and arrow U3 direction) of the second depressions 242A and 242B.

  Moreover, in the second comparative example, since the metal intermediate cylinder 226 is arranged, the intermediate cylinder 226 is formed with two window-shaped openings 226H corresponding to the second depressions 242A and 242B, respectively. Necessity arises.

  Thus, also in the second comparative example, at least four molds are necessary. That is, in both the first comparative example and the second comparative example, there is a possibility that the mold structure is complicated and the cost becomes high.

  On the other hand, in the present embodiment, as shown in FIG. 7, the opening direction of the first dent portion 34 and the second dent portions 42A and 42B is the same, so that the first dent portion 34 and the second dent portion 42B are removed in this opening direction (arrow U1 direction). The rubber elastic body 24 can be molded by providing the mold 62 to be molded and the two molds 64A and 64B to be removed in the direction perpendicular to the axis (the direction of the arrow U2 and the direction of the arrow U3). That is, the rubber elastic body 24 can be molded with three molds, and the mold structure is simpler than that of the first comparative example and the second comparative example.

  In addition, since it is not necessary to form a window-like opening like the intermediate cylinder of the second comparative example in the intermediate cylinder part 14B according to this embodiment, the structure as the intermediate cylinder part 14B (outer cylinder 14) is simplified. Can be

  Moreover, in the said embodiment, compared with the structure of a 1st comparative example or a 2nd comparative example, it is possible to make the height of the vibration isolator 12 low. That is, in the structure of the first comparative example, the second dent portions 142A and 142B overlap with the first dent portion 34 when viewed in the axial direction (the direction of the arrow A1), and thus are necessary as the second dent portions 142A and 142B. In order to obtain a structure having a volume, it is inevitably necessary to secure the height of the rubber elastic body 124. Also in the second comparative example, the second dent portions 242A and 242B are overlapped with the first dent portion 34 when viewed in the axial direction (arrow A1 direction), and the rubber lid portion 218 is formed. The height of the elastic body 224 is increased. On the other hand, in this embodiment, the second dent portions 42A and 42B are formed outside the first dent portion 34 when viewed in the axial direction, and these concave portions do not overlap in the axial direction. It is possible to reduce the height of the direction.

  In the above description, the liquid is circulated between the second main liquid chambers 40A and 40B and the sub liquid chamber 30 through the second orifices 52A and 52B. In the structure in which the liquid can flow between the chambers 40A and 40B and the auxiliary liquid chamber 30, the number of the second main liquid chambers 40A and 40B is not particularly limited, and may be one, or three or more. It may be.

  In addition, in this way, the second orifice is not communicated between the second main liquid chambers 40A and 40B, but the structure in which the liquid flows between the second main liquid chambers 40A and 40B and the sub liquid chamber 30. And the liquid may flow between the second main liquid chambers 40A and 40B. In this structure, a plurality of second main liquid chambers 40A and 40B are necessarily provided.

  In the above description, an example in which the first depression 34 and the second depressions 42 </ b> A and 42 </ b> B are formed in the rubber elastic body 24 is described. In order to configure the first main liquid chamber 28, The depression 34 is not necessarily formed in the rubber elastic body 24. That is, even if the rubber elastic body is formed in a disk shape or a conical shape and a cylindrical member of another member (made of metal or resin) is erected in the axial direction from the periphery thereof, the rubber elastic body The 1st main liquid chamber between a cylindrical member can be comprised. In such a structure, if the opening direction of the first main liquid chamber and the opening direction of the second main liquid chamber (the opening direction of the second recess) are set in the same direction, a mold having a simple structure is used. Can be manufactured.

12 Vibration isolator 14 Outer cylinder 16 Mounting plate 18 Diaphragm 24 Rubber elastic body 24B Rubber main body portion 32D Orifice disc portion 32E Cylindrical portion 28 First main liquid chamber 30 Sub liquid chamber 32 Partition member 34 First recess 36 First orifice (First restricted passage)
38 communication hole 40A, 40B 2nd main liquid chamber 42A, 42B 2nd hollow part (recessed part)
50 Insertion wall (insertion member)
52A, 52B Second orifice (second restriction passage)
62, 64A, 64B Mold S axis

Claims (6)

A first attachment member coupled to one of the vibration generating portion and the vibration receiving portion;
A second attachment member coupled to the other of the vibration generating portion and the vibration receiving portion;
An elastic body arranged between the first mounting member and the second mounting member and connecting the first mounting member and the second mounting member;
Opened on the opposite side of the vibration generating part or the vibration receiving part connected to the first mounting member, and at least a part of the inner wall is constituted by the elastic body to enclose the liquid, and the vibration generating part and the vibration receiving part A first main liquid chamber located inside the outer edge of the second mounting member when viewed in the main vibration direction by relative movement;
A sub liquid chamber in which a liquid is enclosed and a part of the inner wall is configured by a diaphragm, and the internal volume can be expanded and contracted according to a change in the hydraulic pressure;
A partition member that partitions the first main liquid chamber and the sub liquid chamber;
A first restriction passage that allows liquid to move between the first main liquid chamber and the sub liquid chamber;
A second main liquid chamber in which at least a part of an inner wall is constituted by a recess formed in the elastic body outside the first main liquid chamber when viewed in the main vibration direction, and in which a liquid is enclosed;
A lid member covering the recess;
A second restriction passage that allows liquid to move between the second main liquid chambers or between the second main liquid chamber and the sub liquid chamber;
With
The vibration isolator in which the opening direction of the first main liquid chamber is the same as the opening direction of the recesses constituting the second main liquid chamber.   The vibration isolator according to claim 1, wherein a deformation suppressing member that suppresses deformation of the elastic body in the outer direction is disposed further outside the second main liquid chamber.   The vibration isolator according to claim 2, wherein the deformation suppressing member is provided as a part of the second mounting member.   The vibration isolator according to any one of claims 1 to 3, wherein the partition member is formed with an insertion member that is inserted into the recess to partially reduce a cross-sectional area of the opening of the recess.   The vibration isolator according to any one of claims 1 to 4, wherein the partition member and the lid plate member are integrated into a partition member.   The vibration isolator according to any one of claims 1 to 5, wherein the second main liquid chamber is formed to be long in the main vibration direction in a cross section along the input direction of the main vibration.

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