JP2007177974A - Vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of a knocking noise caused by a looseness between a first partition member and a restricting portion by the impact force caused by the collision of a passage control plate with a first partition member composing a part of the inside wall surface of a storage chamber. <P>SOLUTION: In the vibration damper 10, an orifice forming portion 114 provided on a partition member 48 can elastically deform in the axial direction. A stepped portion 18 and a supporting cylinder 52 hold the orifice forming portion 114 of the partition member 48 from outside in the axial direction. The movement of a partition wall body 100 including the partition member 48 on the inner peripheral side of an outer cylindrical fitting 14 is restricted while compressively deforming (deflective deformation) the spring portion 118 of the orifice forming portion 114 in the axial direction. As a result, even if a passage control plate 94 collides with a lid fitting 50 and the partition member 48 when a vibration is transmitted to an outer cylindrical fitting 14 or an inner cylindrical fitting 12, the generation of the looseness between the partition wall body 100 and the stepped portion 18, and between the partition wall body 100 and the supporting cylinder 52 by the impact force can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is applied to, for example, an automobile, a general industrial machine, and the like and attenuates and absorbs vibration transmitted from a vibration generating unit such as an engine to a vibration receiving unit such as a vehicle body.

  In an automobile, an engine mount is disposed as an anti-vibration device between the engine and the vehicle body (frame). As an example of an anti-vibration device applied as such an engine mount, a liquid-sealed device shown in Patent Document 1 is known. In the vibration isolator shown in Patent Document 1, a liquid chamber space sealed from the outside is formed by an outer cylinder, a rubber elastic body, and a diaphragm, and this liquid chamber space is inserted into the outer cylinder. The inner partition wall is divided into a main liquid chamber whose rubber elastic body is a part of the partition wall, and a sub liquid chamber whose diaphragm is a part of the partition wall. They are connected by an orifice.

  Here, the main liquid chamber, the sub liquid chamber, and the orifice are filled with a liquid such as water or polyalkylene glycol. The internal partition is provided with an orifice, which is a restricting passage for communicating the main liquid chamber and the sub liquid chamber on the outer peripheral side. A storage chamber, which is a cylindrical space, is provided inside the inner partition wall on the inner peripheral side of the orifice. The storage chamber is connected to the main liquid chamber and the sub-surface through first and second openings formed in the partition wall. Each communicates with the liquid chamber. In this vibration isolator, a movable plate formed in a disc shape with rubber or the like is accommodated as a flow control plate in the storage chamber, and this movable plate can vibrate along the amplitude direction of input vibration in the storage chamber. Has been.

  In the vibration isolator configured as described above, when the frequency of the input vibration is higher than a predetermined value, the orifice is clogged, but the movable plate vibrates in synchronization with the input vibration in the storage chamber. Since the liquid flows between the main liquid chamber and the sub liquid chamber through the storage chamber by alternately opening and closing the first and second openings, the rubber accompanying an increase in the liquid pressure in the main liquid chamber The rise of the dynamic spring constant of the elastic body can be suppressed, and the dynamic spring constant of the rubber elastic body is kept low even when such high frequency vibration is input, and the high frequency vibration is effectively prevented by elastic deformation of the rubber elastic body. Can absorb.

  As an internal partition wall used in the vibration isolator as described above, for example, a partition member formed in a thick disc shape with an aluminum alloy or the like and having a circular recess formed in the center of the upper surface thereof, and a thin wall with a steel plate or the like. Some include a lid member formed in a disk shape. When assembling the internal partition, the movable plate is inserted into the recess, and the outer peripheral portion (flange portion) of the partition member and the outer peripheral portion (flange portion) of the lid member are brought into contact with each other. Is inserted into the inner peripheral side of the outer cylinder of the vibration isolator, and a part of the outer cylinder is caulked so that the outer peripheral edge portions of the partition member and the lid member are clamped to fix the partition member and the lid member to each other. Then, it is fixed to a predetermined position in the outer cylinder.

In addition, some thick disc-shaped partition members are formed with orifice grooves extending in the circumferential direction on the outer peripheral surface thereof, and the outer peripheral side of this orifice groove is closed by the inner peripheral surface of the outer cylinder. Thus, a part of the orifice connecting the main liquid chamber and the sub liquid chamber is formed.
JP-A-1-193425

  However, in the vibration isolator as described above, the movable plate vibrates along the amplitude direction of the input vibration at the time of vibration input, and repeatedly collides with the inner wall surface of the storage chamber at a period corresponding to the frequency of the input vibration. The impact force when colliding with the inner wall of the storage chamber repeatedly acts on the partition member fixed in the outer cylinder.

  Here, the flange part of the partition member is clamped by a caulking part (restraint part) provided on the outer cylinder and the movement in the axial direction is restrained, and the flange part of the partition member is on the outer peripheral surface. By forming the orifice groove, the thickness along the axial direction is reduced. For this reason, when the impact force from the movable plate repeatedly acts on the partition member over a long period of time, the impact force may cause creep deformation in the vicinity of the outer peripheral edge of the flange portion of the partition member. When such creep deformation occurs in the flange portion of the partition member, a minute gap (backlash) is generated between the partition member and the restraining portion of the outer cylinder, and the partition member receives an impact force from the movable plate. A hitting sound is generated by colliding with the lid member or the outer cylinder. The hitting sound generated from the vibration isolator in this manner may be transmitted as an unpleasant noise through the vehicle body into the vehicle.

  In the vibration isolator as described above, a thin film-like covering portion integrally formed with the rubber elastic body is fixed to the inner peripheral surface of the outer cylinder by vulcanization adhesion or the like, and the restraining portion is interposed through this covering portion. Clamps the flange portion of the partition member and restrains the movement in the axial direction. However, since the rubber elastic body is formed of a rubber material having relatively low damping and high rigidity, the same rubber as this rubber elastic body is used. The impact force from the movable plate cannot be effectively buffered only by the covering portion formed of the material.

  In view of the above facts, the object of the present invention is to provide the first partition member and the restraining portion by the impact force generated when the flow control plate collides with the first partition member constituting a part of the inner wall surface of the storage chamber. Another object of the present invention is to provide an anti-vibration device capable of preventing the occurrence of a hitting sound due to play between the two.

  In order to solve the above-described problem, a vibration isolator according to claim 1 of the present invention is formed in a cylindrical shape, and is connected to one of a vibration generator and a vibration receiver, and the first attachment member A second mounting member disposed on the inner peripheral side of the mounting member and connected to the other of the vibration generating unit and the vibration receiving unit, and disposed between the first mounting member and the second mounting member. A rubber elastic body, a liquid is sealed, a main liquid chamber whose internal volume changes as the rubber elastic body is deformed with the rubber elastic body as a part of a partition wall, a liquid is sealed, and the content is changed according to a change in liquid pressure A sub-liquid chamber whose product can be expanded and contracted, a first partition member that is fitted and inserted into the inner peripheral side of the first mounting member, and divides the main liquid chamber and the sub-liquid chamber; A storage that is fitted on the inner peripheral side of the first mounting member and partitioned from the main liquid chamber and the sub liquid chamber between the first partition member and the first partition member. And an orifice groove formed in the first partition member, the orifice groove extending in the circumferential direction is formed on the outer peripheral surface, and elastically deformable along the axial direction. Formed at least in part by the forming portion and the orifice groove, respectively, formed in a restricting passage communicating the main liquid chamber and the sub liquid chamber, the first partition member and the second partition member, The first and second openings that communicate the storage chamber with the main liquid chamber and the sub liquid chamber, and are disposed in the storage chamber, and vibrate in synchronization with the input vibration when vibration is input. A flow control plate that alternately opens and closes the opening and the second opening, and an inner peripheral side of the first mounting member, the orifice forming portion is sandwiched from the outside in the axial direction, and the orifice Compression deformation along the axial direction of the forming part So while, characterized by having a a restraining portion for restraining the movement along the axial direction of the first partition member.

  In the vibration isolator according to the first aspect, the orifice forming portion provided in the first partition member can be elastically deformed along the axial direction, and the restraining portion moves the orifice forming portion in the first partition member in the axial direction. By clamping from the outside and compressing and deforming the orifice forming portion along the axial direction, the movement of the first partition member along the axial direction is restricted, so that the first mounting member or the second mounting member is attached. At the time of vibration input, the flow control plate that receives the pressure wave generated in the liquid in the main liquid chamber vibrates along the amplitude direction (axial direction) of the input vibration, and the flow control plate forms a part of the inner wall surface of the storage chamber. When it collides with the first partition member and a load (impact load) is applied along the axial direction, the impact load from the flow control plate is also transmitted to the orifice forming portion in the first partition member. Orifice formation along the axial direction Although it is elastically deformed, the orifice forming portion that has been previously compressed in the axial direction (pre-compressed state) generates a restoring force in the extension direction, and the restoring force can maintain the state in which the partition member presses against the restraining portion. Even if the flow control plate collides with the first partition member constituting a part of the inner wall surface of the storage chamber, it is possible to prevent the backlash from being generated between the first partition member and the restraining portion due to the impact force. In addition, it is possible to prevent the hitting sound from being generated between the first partition member and the restraining portion.

  The vibration isolator according to claim 2 of the present invention is the vibration isolator according to claim 1, wherein the first partition member is integrally formed of a flexible metal plate. .

  A vibration isolator according to claim 3 of the present invention is the vibration isolator according to claim 2, wherein the orifice forming portion is formed in a substantially U-shape that opens a flexible metal plate toward the outer peripheral side. It is formed to be curved in a substantially V shape, bendable and deformable along the axial direction, and the outer peripheral side of the metal plate curved in a U shape is the orifice groove.

  As described above, according to the vibration isolator of the present invention, the flow control plate is restrained from the first partition member by the impact force generated by the collision with the first partition member constituting a part of the inner wall surface of the storage chamber. It is possible to prevent a rattling sound from occurring due to a backlash between the two parts.

  Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

(Configuration of the embodiment)
FIG. 1 shows a vibration isolator according to an embodiment of the present invention. The vibration isolator 10 is applied as an engine mount that supports an engine that is a vibration generating unit in a vehicle such as an automobile to a vehicle body that is a vibration receiving unit. 1 indicates the axis of the apparatus, and the following description will be given with the direction along the axis S as the axial direction of the apparatus.

  As shown in FIG. 1, the vibration isolator 10 is disposed substantially coaxially on the inner cylinder fitting 12 formed in a substantially thick cylindrical shape connected to the engine side and on the outer peripheral side of the inner cylinder fitting 12. And a substantially thin cylindrical outer cylinder fitting 14 connected to the vehicle body side, and a rubber elastic body 16 made of rubber and disposed between the inner cylinder fitting 12 and the outer cylinder fitting 14 and serving as a main vibration absorber. . The upper end side of the inner cylinder fitting 12 is inserted into the inner peripheral side of the outer cylinder fitting 14, and the lower end side protrudes to the lower side of the outer cylinder fitting 14 through the opening on the lower end side of the outer cylinder fitting 14. The outer tube fitting 14 is formed with an enlarged diameter portion 20 having a diameter larger than that of the lower end portion at the upper end portion with respect to the step portion 18 provided at the axially intermediate portion thereof. In addition, the outer tubular metal fitting 14 is formed with a tapered portion 22 whose diameter decreases in a tapered manner downward at the lower end portion thereof, and is bent at the upper end portion of the enlarged diameter portion 20 toward the inner peripheral side when the apparatus is assembled. A caulking portion 24 is formed.

  The vibration isolator 10 includes a substantially cup-shaped connecting tube 26 in which the lower end side of the outer tube fitting 14 is fitted and fixed, and a substantially bottomed cylindrical holder fitting 28 in which the lower end side of the connecting tube 26 is fitted and fixed. Is provided. The outer cylinder fitting 14 is inserted into the connecting cylinder 26 until the lower end thereof is in contact with the bottom plate portion of the connecting cylinder 26. In addition, a plurality of leg portions 30 and 32 are fixed to the outer peripheral surface of the holder metal fitting 28 by welding or the like, and a bolt (not shown) is inserted through a connecting hole 33 formed on the distal end side of the leg portions 30 and 32. Thus, the holder fitting 28 is fastened and fixed to the vehicle body side. As a result, the outer cylinder fitting 14 is connected and fixed to the vehicle body via the connection cylinder 26 and the holder fitting 28.

  The lower end side of the inner cylinder fitting 12 protrudes to the lower side of the connection cylinder 26 through an opening 27 formed in the bottom plate portion of the connection cylinder 26, and an engine 34 is connected to the lower end portion of the inner cylinder fitting 12 by a bolt 34. The base end portion of the connecting bracket 36 is fastened and fixed. The bracket 36 extends to the outer peripheral side through an opening (not shown) formed in the side surface portion of the holder fitting 28, and the front end side of the bracket 36 is fastened and fixed to the engine (not shown) side by a bolt or the like. Is done. The base end portion of the bracket 36 is covered with a stopper rubber 38 formed in a tube shape, and the upper surface portion of the stopper rubber 38 is in pressure contact with the bottom plate portion of the connecting cylinder 26. Thereby, an excessive displacement along the axial direction of the bracket 36 is prevented, and the occurrence of a collision sound is also prevented when the bracket 36 collides with the connecting cylinder 26 or the holder fitting 28 due to an input of a large load.

  A bottom plate portion of an extension fitting 40 formed in a substantially cup shape that opens upward is fixed to the upper end surface of the inner cylinder fitting 12 by welding or the like. The extension fitting 40 has a tapered shape whose side plate portion has a diameter increasing from the bottom plate side toward the upper end side, and a ring-shaped flange member 42 is fixed to the upper end portion of the side plate portion by welding or the like. The extension fitting 40 extends from the upper end portion to the inner peripheral side. A plurality of runner holes 44 for filling the extension metal fitting 40 with vulcanized rubber, which is a molding material of the rubber elastic body 16, are formed in the side plate portion of the extension metal fitting 40.

  The rubber elastic body 16 is vulcanized and bonded to the upper end side of the inner cylinder fitting 12 inserted into the outer cylinder fitting 14 and the extension fitting 40, and is vulcanized and bonded to the lower end side of the outer cylinder fitting 14, respectively. The inner cylinder fitting 12 and the outer cylinder fitting 14 are connected elastically. Here, the rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal member 12 and the outer peripheral surface of the extension metal member 40, and is filled on the inner peripheral side of the extension metal member 40 through the runner hole 44. The inner peripheral surface and bottom surface of the extension fitting 40 and the lower surface of the flange member 42 are also vulcanized and bonded. Further, the rubber elastic body 16 is integrally formed with a thin covering portion 46 that extends upward from the upper end portion on the outer peripheral side, and this covering portion 46 is added to the inner peripheral surface of the outer cylinder fitting 14. It is glued to cover the inner peripheral surface of the outer cylindrical fitting 14 from the upper end on the outer peripheral side of the rubber elastic body 16 to the upper end of the caulking portion 24.

  As shown in FIG. 1, a partition wall 100 (see FIG. 3) formed in a generally thick disk shape on the upper side of the stepped portion 18 is fitted on the inner peripheral side of the outer cylindrical metal fitting 14. The outer peripheral edge portion of the lower surface of the partition wall 100 is in contact with the step portion 18 through the covering portion 46. A cylindrical support cylinder 52 is fitted into the outer cylinder fitting 14 on the upper side of the partition body 100, and the lower end portion of the support cylinder 52 is in contact with the outer peripheral edge of the upper surface of the partition body 100. In the outer cylinder fitting 14 into which the partition wall 100 and the support cylinder 52 are inserted, the caulking portion 24 having a constant inner and outer diameter is bent in a tapered shape toward the inner peripheral side. As a result, the partition wall 100 and the support cylinder 52 are fixed between the stepped portion 18 and the caulking portion 24 in the outer cylinder fitting 14.

  Here, an outer peripheral portion of a rubber diaphragm 54 formed in the shape of a convex ridge facing upward on the inner peripheral surface of the support cylinder 52 is vulcanized and bonded over the entire periphery. As shown in FIG. 2, the partition body 100 includes a substantially bottomed cylindrical partition member 48 whose upper surface is closed, and a substantially hat-shaped lid fitting 50 that is in close contact with the upper surface portion of the partition member 48. Yes. The partition member 48 is formed by a method such as pressing using a metal plate such as a flexible spring steel plate or stainless steel plate as a material, and the lid fitting 50 is also formed by a method such as pressing using a stainless steel plate or steel plate as a material. Molded.

  In the vibration isolator 10, the stepped portion 18, the caulking portion 24, and the support cylinder 52 are each configured as a restraining portion for the partition body 100, and these sandwich the outer peripheral edge of the partition body 100 from the outside in the axial direction. Is restrained from moving in the axial direction. Further, the movement of the partition wall 100 in the radial direction is restrained by the inner peripheral surface of the outer cylinder fitting 14.

  In the vibration isolator 10, a liquid chamber space sealed from the outside is formed by the outer cylindrical metal member 14, the rubber elastic body 16, and the diaphragm 54, and the liquid chamber space is formed by separating the rubber elastic body 16 by the partition body 100. It is divided into a main liquid chamber 56 that is a part of the partition wall and a sub liquid chamber 58 that has the diaphragm 54 as a part of the partition wall. In the vibration isolator 10, the outside of the diaphragm 54 that forms a part of the partition wall of the sub liquid chamber 58 is an atmospheric space, so that the diaphragm 54 responds to changes in the liquid pressure in the sub liquid chamber 58. The liquid chamber 58 can be deformed so as to expand and contract the internal volume. Further, the main liquid chamber 56 expands and contracts with the elastic deformation of the rubber elastic body 16.

  As shown in FIG. 2, the partition member 48 is provided with a thin disc-shaped main body plate 112 on the upper end side, and an orifice forming portion 114 extending downward from the outer peripheral end of the main body plate 112 is integrally formed. Is formed. The orifice forming portion 114 has a substantially U-shape in which a portion on the outer peripheral side of the metal plate forming the partition member 48 is bent downward to have a cylindrical shape, and a cross-sectional shape of the cylindrical portion opens toward the outer peripheral side. Alternatively, it is formed by being curved (in this embodiment, press working) so as to be V-shaped. Thereby, the orifice groove | channel 60 which has a substantially U-shaped thru | or V-shaped cross-sectional shape is formed in the outer peripheral side of the orifice formation part 114 over the perimeter.

  As shown in FIG. 2A, the orifice forming portion 114 is formed with a flat plate-like crimping portion 116 that is in close contact with the lower surface side of the main body plate 112 on the upper end side, and the inner periphery of the crimping portion 116. A spring portion 118 that extends from the end portion toward the outer peripheral side and is gently curved in a concave shape is formed. When the spring portion 118 receives a compressive load along the axial direction, the spring portion 118 bends and deforms in the compressing direction, and generates a restoring force outward in the axial direction as a reaction force, while the thickness along the axial direction of the orifice forming portion 114. Is reduced according to the magnitude of the input load.

  In the vibration isolator 10, when the partition body 100 inserted and inserted into the outer cylindrical metal fitting 14 is sandwiched and fixed between the step portion 18 and the support tube 52, the spring in the partition member 48 is formed by the step portion 18 and the support tube 52. The portion 118 is bent and deformed in the compression direction by a predetermined compression amount along the axial direction (compression deformation), whereby the outer peripheral edge of the upper surface of the partition body 100 is supported by the support cylinder 52 by the restoring force in the extension direction of the spring portion 118. And the outer peripheral edge of the lower surface of the partition wall 100 is maintained in pressure contact with the stepped portion 18.

  In the orifice groove 60 of the partition member 48, as shown in FIG. 2B, a closing block 120 formed of a rubber material is fitted and fixed by adhesion or the like. The closing block 120 closes the circumferential intermediate portion of the annular orifice groove 60 and forms an end-shaped (C-shaped) space (orifice space) extending in the circumferential direction in the orifice groove 60. The partition member 48 has a body plate 112 and a pressure-bonding portion 116 cut out in a rectangular shape from the outer peripheral end toward the inner peripheral side so as to face one end in the circumferential direction of the orifice space in the orifice groove 60. The communication port 64 is formed, and the leaf spring portion 118 is cut out in a rectangular shape from the lower end toward the upper end side so as to face the other circumferential end of the orifice space in the orifice groove 60. Is formed.

  Here, as shown in FIG. 1, the orifice groove 60 is closed at its outer peripheral side by the inner peripheral surface of the outer cylinder fitting 14 so that the main liquid chamber 56 and the sub liquid chamber 58 communicate with each other. The orifice 66 is formed.

  The main liquid chamber 56, the sub liquid chamber 58 and the orifice 66 are filled with a liquid such as water or ethylene glycol, and this liquid can flow between the main liquid chamber 56 and the sub liquid chamber 58 through the orifice 66. It is said that. Here, the orifice 66 is set (tuned) so that its path length and cross-sectional area match the amplitude and frequency of the shake vibration.

  As shown in FIG. 2A, the partition member 48 has a circular portion on the center side of the main body plate 112 as a bottom plate portion 90, and an annular portion on the outer peripheral side of the bottom plate portion 90 is connected to the flange portion 110. Has been. As shown in FIG. 2B, the bottom plate 90 has a plurality of fan-shaped openings 92 (in the present embodiment, four) whose dimensions extend in the circumferential direction from the central portion toward the outer peripheral side. It has been drilled. These openings 92 communicate the storage chamber 80 described later to the main liquid chamber 56. Further, the partition member 48 is formed with a circular concave relief portion 72 on the inner peripheral side of the orifice forming portion 114 on the lower surface side, and in the relief portion 72, as shown in FIG. The extension fitting 40 and the upper end of the rubber elastic body 16 are inserted with a gap between the base plate 90 and the bottom plate 90.

  Here, the gap between the bottom plate 90 and the extension fitting 40 and the rubber elastic body 16 is shown in FIG. 1 in a state where the engine is connected to the bracket 36 and a load resulting from the weight of the engine is input to the bracket 36. Since it is enlarged more than the state shown and has a sufficient width, the extension fitting 40 and the rubber elastic body 16 do not come into contact with the bottom plate portion 90 even if vibration is input.

  The lid 50 is formed with a circular convex compartment 74 corresponding to the bottom plate 90 of the partition member 48 at the center thereof, and an annular shape extending from the lower end of the compartment 74 to the outer peripheral side. The flange portion 76 is integrally formed. As shown in FIG. 2, the partition body 100 includes a ring-shaped packing member 84 interposed between the flange portion 110 of the partition member 48 and the flange portion 76 of the lid fitting 50. The packing member 84 is formed into a thin plate shape having a constant thickness by a rubber composition such as NR, NBR, or silicone rubber, and the width along the radial direction is substantially equal to the width of the flange portion 76. It has become. Further, in the partition wall 100, rectangular cutout portions 82 and cutout portions 86 are formed on the flange portion 110 and the packing member 84 of the lid fitting 50 so as to face the communication port 64 of the partition member 48, respectively.

  When assembling the partition body 100 composed of the partition member 48, the lid fitting 50 and the packing member 84, a flow control plate 94 described later is placed on the bottom plate portion 90 of the partition member 48, and the packing is placed on the flange portion 110. After the member 84 is placed, the lid fitting 50 is placed on the partition member 48 and the flange portion 76 of the lid fitting 50 is brought into close contact with the flange portion 110 of the partition member 48. As a result, the assembly of the partition body 100 as a component in the apparatus is completed, and the support cylinder 52 to which the partition body 100 and the diaphragm 54 are vulcanized and bonded is fitted and inserted into the inner peripheral side of the outer cylinder fitting 14. The caulking portion 24 of the metal fitting 14 is caulked toward the inner peripheral side.

  As shown in FIG. 3A, in the partition body 100, the compartment portion 74 is placed on the upper side of the bottom plate portion 90 of the partition member 48, and the flange portions 76 and 110 are abutted with each other via the packing member 84. As a result, a storage chamber 80 partitioned from the main liquid chamber 56 and the sub liquid chamber 58 is formed between the bottom plate portion 90 and the compartment portion 74. In the storage chamber 80, a disk-shaped space having a substantially constant thickness along the axial direction is formed. As shown in FIG. 2 (B), the lid 50 has a plurality of fan-shaped openings 88 on its top plate portion 78 whose dimensions extend in the circumferential direction from the inner periphery toward the outer periphery (this embodiment). In the form, 4 pieces are drilled. Accordingly, the storage chamber 80 communicates with the auxiliary liquid chamber 58 through the opening 88 of the lid fitting 50 and communicates with the main liquid chamber 56 through the opening 92 of the bottom plate 90. One end of the orifice 66 of the partition wall 100 communicates with the auxiliary liquid chamber 58 through the communication port 64, the notch 86 and the notch 86, and the other end communicates with the main liquid chamber 56 through the communication port 62.

  As shown in FIG. 3A, a distribution control plate 94 formed in a disc shape using rubber, resin or the like as a material is disposed in the storage chamber 80. The flow control plate 94 is formed in a thin disk shape having a substantially constant thickness as a whole, and its outer diameter is slightly smaller than the inner diameter of the storage chamber 80.

  The flow control plate 94 has a thickness PT (see FIG. 3A) shorter than a dimension ST (see FIG. 3A) along the axial direction of the storage chamber 80 by a predetermined dimension. Specifically, for example, the difference between the thickness PT of the flow control plate 94 and the thickness ST of the storage chamber 80 is shorter than the amplitude of the shake vibration that is a relatively low frequency vibration of the input vibration, and It is set to be longer than the amplitude of idle vibration, which is a relatively high frequency vibration. Thereby, in the storage chamber 80, a gap having a width corresponding to the amplitude difference between the low frequency vibration and the high frequency vibration is formed along the axial direction between the bottom plate portion 90 and the top plate portion 78 of the flow control plate 94. . Thereby, the flow control plate 94 stored in the storage chamber 80 can reciprocate (vibrate) along the axial direction with an amplitude corresponding to the amplitude difference between the low-frequency vibration and the high-frequency vibration.

(Operation of the embodiment)
Next, the operation and action of the vibration isolator 10 according to the embodiment of the present invention configured as described above will be described. In the vibration isolator 10, when the vibration is input from the engine or the vehicle body side, the rubber elastic body 16 which is the main vibration absorber is elastically deformed by the vibration. Thereby, the input vibration is attenuated and absorbed by the internal friction of the rubber elastic body 16 or the like.

  In the vibration isolator 10, when the rubber elastic body 16 is elastically deformed in synchronization with the vibration input at the time of vibration input from the engine or the vehicle body side, the internal volume of the main liquid chamber 56 is expanded and contracted and the hydraulic pressure is changed. Along with this change in liquid pressure, the liquid flows between the main liquid chamber 56 and the sub liquid chamber 58 through the orifice 66, and the flow control plate stored in the storage chamber 80 communicating with the main liquid chamber 56. 94, a hydraulic pressure (pressure wave) that periodically changes in synchronization with the input vibration acts, and the flow control plate 94 that has received this pressure wave vibrates along the axial direction in the storage chamber 80, The operation of abutting and separating the upper surface portion and the lower surface portion with respect to the top plate portion 78 of the lid fitting 50 and the bottom plate portion 90 of the partition member 48 is repeated.

  In the vibration isolator 10, when the flow control plate 94 moves downward and comes into contact with the bottom plate portion 90, the opening 92 that opens to the bottom plate portion 90 is closed by the lower surface portion of the flow control plate 94, and the flow control plate 94 is When spaced apart from the bottom plate 90, the opening 92 is opened. Further, when the flow control plate 94 moves upward and comes into contact with the top plate portion 78, the opening 88 opened to the top plate portion 78 is closed by the upper surface portion of the flow control plate 94.

  In the vibration isolator 10, when the frequency of the input vibration is low and the amplitude thereof is equal to or greater than a predetermined value, the liquid pressure in the main liquid chamber 56 substantially changes (increases and increases) with respect to the liquid pressure in the sub liquid chamber 58. The flow control plate 94 is in close contact with one of the bottom plate portion 90 and the top plate portion 78, and one of the openings 88 and 92 is closed and passes through the storage chamber 80. The liquid does not substantially flow between the main liquid chamber 56 and the sub liquid chamber 58, and the liquid flows between the main liquid chamber 56 and the sub liquid chamber 58 through only the orifice 66.

  Specifically, in the vibration isolator 10, when the frequency of the input vibration is equal to or less than the frequency of the shake vibration (for example, 8 to 12 Hz), the liquid pressure in the main liquid chamber 56 is changed to the liquid pressure in the sub liquid chamber 58. On the other hand, during the period of change (rise and fall), one of the openings 88 and 92 is closed by the flow control plate 94. Thus, when shake vibration is input, the liquid does not substantially flow between the main liquid chamber 56 and the sub liquid chamber 58 through the storage chamber 80, and the main liquid chamber 56 and the sub liquid chamber 56 are connected only through the orifice 66. Liquid flows between the liquid chamber 58 and each other.

  As a result, according to the vibration isolator 10, when the input vibration is particularly a shake vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the orifice 66, and the input vibration is caused by the action of the liquid column resonance. It can be attenuated particularly effectively.

  Further, in the vibration isolator 10, when the frequency of the input vibration is higher than the frequency of the shake vibration and the amplitude thereof is small, for example, when the input vibration is an idle vibration (for example, 20 to 30 Hz), the vibration isolator 10 is suitable for the shake vibration. The orifice 66 tuned so as to become clogged, and it becomes difficult for the liquid to flow through the orifice 66. However, the flow control plate 94 vibrates in the storage chamber 80 in synchronization with the input vibration, so that the main liquid chamber 56 A gap is formed between the flow control plate 94 and one of the bottom plate portion 90 and the top plate portion 78 during a period in which the hydraulic pressure in the sub liquid chamber 58 substantially changes with respect to the hydraulic pressure. Since the portions 88 and 92 are alternately opened, liquid flows through the storage chamber 80 between the main liquid chamber 56 and the sub liquid chamber 58.

  As a result, according to the vibration isolator 10, when the high frequency vibration having a frequency higher than the shake vibration is input, the orifice 66 becomes clogged and the liquid hardly flows through the orifice 66. Since the liquid in the main liquid chamber 56 flows out to the sub liquid chamber 58 through the storage chamber 80 so that the increase in the liquid pressure is suppressed, a device (rubber elasticity caused by the increase in the liquid pressure in the main liquid chamber 56 is used. The rise of the dynamic spring constant of the body 16 and the liquid in the main liquid chamber 56 can be suppressed, and the dynamic spring constant of the rubber elastic body 16 can be kept low even when such high-frequency vibration (idle vibration or booming noise) is input. In addition, high-frequency vibrations can be effectively absorbed by the elastic deformation of the rubber elastic body 16.

  Further, in the vibration isolator 10, the orifice forming portion 114 provided on the partition member 48 can be elastically deformed along the axial direction, and the stepped portion 18 and the support cylinder 52 are located outside the orifice forming portion 114 in the partition member 48 in the axial direction. And the spring portion 118 of the orifice forming portion 114 is compressed and deformed along the axial direction (deflection deformation), and along the axial direction of the partition wall body 100 including the partition member 48 on the inner peripheral side of the outer cylinder fitting 14. By restricting the movement, the flow control plate 94 that receives the pressure wave generated in the liquid in the main liquid chamber 56 when the vibration is input to the outer cylinder fitting 14 or the inner cylinder fitting 12 causes the amplitude direction (axial direction) of the input vibration. And the flow control plate 94 collides with the top plate portion 78 of the cover fitting 50 and the bottom plate portion 90 of the partition member 48 constituting a part of the inner wall surface of the storage chamber 80, and the top plate portion 78 or To bottom plate 90 When a load along the direction (impact load) is applied, the impact load from the flow control plate 94 is also transmitted to the orifice forming portion 114 in the partition member 48, and the leaf spring portion 118 of the orifice forming portion 114 is caused by this impact load. Although elastically deformed (bend deformation) along the axial direction, the spring portion 118 that has been compressed (pre-compressed) along the axial direction in advance generates a restoring force in the extension direction, and the partition body 100 is caused by this restoring force. Can maintain a state in which the stepped portion 18 and the support cylinder 52 are in pressure contact with each other, even if the flow control plate 94 collides with the top plate portion 78 and the bottom plate portion 90 constituting a part of the inner wall surface of the storage chamber 80, the impact force Can prevent rattling from occurring between the partition wall 100 and the stepped portion 18 and the support cylinder 52, can prevent noise from being generated between these members, and can be used between the partition member 48 and the lid fitting 50. Because through the packing member 84 can also prevent occurrence of rattling, it is also possible to prevent the striking sound between the partition member 48 and the cover fitting 50 is generated.

  In addition, in the vibration isolator 10 according to the present embodiment, the partition member in the partition wall body 100 is formed by sandwiching the outer peripheral edge portion of the partition wall body 100 fitted into the outer cylinder fitting 14 by the stepped portion 18 and the support cylinder 52. 48 and the lid fitting 50 are fixed to each other, but by sandwiching only the outer peripheral edge portion of the partition member 48 in the partition body 100 fitted and inserted into the outer cylinder fitting 14 by the step portion 18 and the support cylinder 52, The partition member 48 may be fixed in the outer cylinder fitting 14, and the lid fitting 50 may be fixed to the upper surface side of the partition member 48 by a method such as caulking.

  In the above case, for example, a plurality of caulking projections are fixed to the flange portion 110 of the partition member 48, and through holes are formed in portions corresponding to the plurality of caulking projections in the flange portion 76 of the lid fitting 50, respectively. The lid fitting 50 is fixed so as to be in close contact with the upper surface side of the partition member 48 by inserting the caulking protrusion into the through hole and caulking the tip portion so as to increase the diameter.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is the side sectional view and perspective view which show the state which decomposed | disassembled the partition body in the vibration isolator shown by FIG. It is side surface sectional drawing and a perspective view which show the structure of the partition body in the vibration isolator shown by FIG.

Explanation of symbols

10 Antivibration device 12 Inner cylinder fitting (second mounting member)
14 Outer cylinder fitting (first mounting member)
16 Rubber elastic body 18 Step part (restraint part)
24 Caulking part (restraint part)
48 partition member (first partition member)
50 Lid (second partition member)
52 Support tube (restraint)
56 Main liquid chamber 58 Sub liquid chamber 60 Orifice groove 66 Orifice (restricted passage)
80 Storage chamber 94 Distribution control plate 100 Partition body 114 Orifice formation part 116 Crimping part 118 Spring part

Claims (3)

A first mounting member formed in a cylindrical shape and connected to one of the vibration generating portion and the vibration receiving portion;
A second mounting member disposed on the inner peripheral side of the first mounting member and connected to the other of the vibration generating unit and the vibration receiving unit;
A rubber elastic body disposed between the first mounting member and the second mounting member;
A main liquid chamber in which a liquid is enclosed, and the internal volume of the rubber elastic body changes as the rubber elastic body is deformed with the rubber elastic body as a part of a partition;
A sub-liquid chamber in which liquid is enclosed and the internal volume can be expanded and contracted in accordance with a change in hydraulic pressure;
A first partition member that is fitted on the inner peripheral side of the first mounting member and divides the main liquid chamber and the sub liquid chamber;
A second partition member that is fitted on the inner peripheral side of the first attachment member and forms a storage chamber partitioned from the main liquid chamber and the sub liquid chamber between the first partition member and ,
An orifice forming portion provided in the first partition member and formed with an orifice groove extending in a circumferential direction on an outer peripheral surface, and being elastically deformable along the axial direction;
A restriction passage that is at least partially configured by the orifice groove and communicates the main liquid chamber and the sub liquid chamber;
First and second openings formed in the first partition member and the second partition member, respectively, for communicating the storage chamber with the main liquid chamber and the sub liquid chamber;
A flow control plate that is arranged in the storage chamber and vibrates in synchronization with the input vibration when vibration is input, and alternately opens and closes the first opening and the second opening;
Provided on the inner peripheral side of the first mounting member, sandwiching the orifice forming portion from the outside in the axial direction, and compressing and deforming the orifice forming portion along the axial direction, A restraining portion for restraining movement along the axial direction;
An anti-vibration device comprising:   The vibration isolator according to claim 1, wherein the first partition member is integrally formed of a flexible metal plate.   The orifice forming portion is formed by bending a flexible metal plate into a substantially U shape that opens toward the outer peripheral side, and can be bent and deformed along the axial direction. The vibration isolator according to claim 2, wherein an outer peripheral side of a metal plate curved in a V shape is the orifice groove.

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