JP5041598B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that prevents the vibration of a vibration source supported on a foundation from being transmitted to the foundation by elastic deformation of the coil spring, and more particularly, to a structure for preventing surging of the coil spring. Belongs.

  Conventionally, when installing an outdoor unit of an air conditioner as a vibration source on a foundation, a vibration isolator has been used, and in order to absorb vibration and noise of the outdoor unit, An anti-vibration device incorporating a coil spring is provided. In such a vibration isolator, a so-called surging phenomenon occurs in which the amplitude increases when the external force frequency transmitted to the coil spring approaches the natural frequency of the spring itself. Has been.

  As such an anti-vibration device, there exists a thing of the type shown in FIG. 8, FIG. 9, for example (patent document 1).

  In the vibration isolator, a cylindrical ring rubber 100 having a relatively high rigidity is used as a surging preventing member. The ring rubber 100 is fixed to a slit 100a at the lower portion thereof as shown in FIG. The insertion portion 101a of the holder 101 is inserted, and the windings 102a, 102a,... Of the coil spring 102 extending in the vertical direction with the center axis of the ring rubber 100 lying horizontally as shown in FIG.・ It is fitted inside. In FIG. 9, reference numeral 103 denotes a lower spring case, and reference numeral 104 denotes an upper spring case, which can be relatively contacted and separated in the vertical direction.

  According to this vibration isolator, the ring rubber 100 fitted in the windings 102a, 102a,... Of the coil spring 102 is provided on both side portions 100b, 100b of the ring rubber 100 facing each other with the insertion portion 101a interposed therebetween. Specifically, the corners in the width direction are pressed by the windings 102a, 102a,... Of the coil spring 102 and deformed into an oval shape (or an oval shape). It is possible to prevent a surging phenomenon from occurring in the coil spring 102 due to the contact resistance due to the elastic repulsive force.

  Since the insertion portion 101a can restrict the deformation of the both side portions 100b and 100b of the ring rubber 100 so as to approach each other, the ring rubber 100 and the coil spring 102 can be changed by changing the width and shape of the insertion portion 101a. The contact resistance can be adjusted.

Other prior art related to the posture holding member of the present invention includes, for example, Patent Documents 2 and 3.
JP 2004-308811 A Japanese Patent Laid-Open No. 64-49735 Japanese Patent No. 3543758

However, in the vibration isolating apparatus of the above-described Patent Document 1, as shown in FIG. 10, the contraction of the coil spring 102 is prevented by winding 102a of the coil spring 102, 102a, the ring rubber 100 between ... entered As compared with the case where the coil spring 102 contracts normally, the spring constant of the coil spring 102 may appear to be larger, which causes a problem that the vibration isolation performance of the vibration isolation device becomes unstable.

  The present invention has been made in view of such a point, and an object of the present invention is to secure an appropriate contact resistance of the surging preventing member with respect to the coil spring and stabilize the vibration-proof performance in the vibration-proof device having the coil spring. There is.

  In order to achieve the above object, in the present invention, in order to prevent the surging preventing member from entering between the windings of the coil spring when the coil spring contracts, the surging preventing member is provided with a posture holding member that holds the posture. Assembled.

That is, the first member attached to the foundation side, the second member located on the upper side of the first member and attached to the vibration source side, and the spring axis between the first member and the second member. A vibration isolator that includes a coil spring disposed so as to extend in a substantially vertical direction, supports a vibration source by expansion and contraction of the coil spring, and suppresses transmission of vibration to a foundation, The coil spring is pressed against a surging preventing member having elasticity from a direction substantially perpendicular to the spring axis, and the surging preventing member prevents the coil spring from entering between the windings when the coil spring contracts. Thus, the posture holding member that holds the posture is assembled to the support member .

  According to this configuration, first, the coil spring is arranged such that the spring axis extends in a substantially vertical direction between the first member attached to the foundation side and the second member located on the upper side and attached to the vibration source side. Is arranged. Therefore, the vibration transmitted from the vibration source to the foundation can be suppressed by the elastic action due to the expansion and contraction of the coil spring.

  And the surging prevention member which has elasticity from the direction substantially orthogonal to the spring axial center is pressed against this coil spring. Accordingly, the phenomenon of surging that occurs in the coil spring can be effectively prevented by the contact resistance due to the elastic repulsion force of the surging preventing member.

In addition, a posture holding member that holds the posture of the surging prevention member is assembled to the support member in order to prevent it from entering between the windings of the coil spring when contracting. Therefore, a situation in which the surging preventing member prevents the coil spring from contracting and the spring constant of the coil spring is apparently increased can be avoided, and the vibration isolating performance of the vibration isolator can be stably exhibited. .

  Specifically, the surging preventing member is made of a rubber member having a substantially cylindrical shape, and is disposed on the inner side of the coil spring in a state of lying on the side so that the cylinder shaft is substantially horizontal. At least a part of both side portions facing each other with the coil interposed therebetween is pressed against the winding of the coil spring, and is deformed into an elliptical or oval shape that is vertically long. And the end part of the said surging prevention member is fixed to any one of said 1st member and said 2nd member used as a supporting member, The length between the opposing edge part which has opposed this fixed edge part So that the opposite end portion is supported by the posture holding member so that it does not become smaller than a predetermined dimension.

  According to this configuration, the surging preventing member has a simple structure and is easy to assemble to the vibration isolator, so that it is excellent in economy and productivity.

  Further, the opposite end portion facing the fixed end portion fixed to the support member, that is, the elastic end member can be freely displaced so that the length on the long axis side of the surging preventing member does not become smaller than a predetermined dimension. Since the end portion is supported by the posture holding member, it is possible to restrict the both side portions of the surging preventing member in contact with the winding of the coil spring from spreading more than necessary. Therefore, it is possible to effectively prevent a part of the surging preventing member from entering between the windings of the coil spring when the coil spring is contracted.

  Further, even when the coil spring contracts, that is, the load of the vibration source increases, the surging preventing member does not contract following the contraction of the coil spring, and the pressing state against the winding does not change. Accordingly, there is an advantage that the contact resistance between the coil spring and the surging preventing member is increased by the amount of contraction of the coil spring, and the amount of attenuation is increased.

  More specifically, the posture holding member is a long-axis member having a male screw on the peripheral surface, and is inserted through a through hole formed in the fixed end portion of the surging preventing member and extends in a substantially vertical direction. A portion protruding to the outside of the surging preventing member is supported by being screwed into a screw hole provided in the support member, while a tip portion of the portion protruding to the inside of the surging preventing member is the anti-surging member It may be in contact with the inner surface of the opposite end portion.

  In this configuration, first, since the through hole is formed in the fixed end portion that is securely fixed to the support member, even if the surging preventing member is made of a rubber member, the durability is not greatly impaired.

  A long-axis-shaped posture holding member is inserted into the through-hole thus formed so as to extend in a substantially vertical direction, and a portion protruding outside the surging prevention member is screwed into a screw hole provided in the support member. Since it supports, the screwing amount of the attitude | position holding member can be adjusted as needed. Note that the posture holding member does not necessarily have a male screw over the entire peripheral surface, and may be formed only in a necessary region.

  And since the front-end | tip part of the attitude | position holding member protruded inside the surging prevention member is contact | abutting to the inner surface of the opposing edge part of a surging prevention member, the length by the side of the major axis of a surging prevention member becomes small. It is possible to reliably regulate, and the length can be arbitrarily finely adjusted in combination with adjustment of the screwing amount.

  Since the space occupied by the posture holding member can be relatively small, it can be compactly assembled to the surging member.

  In addition, since the surging preventing member is not regulated above the surging member, even if a part of the surging preventing member may enter between the windings, the surging is caused by the contact resistance when the coil spring is extended. Since the force acts to stretch the prevention member up and down, a part of the surging prevention member that has entered between the windings can easily return to the proper state, and the surge prevention member can surely enter the winding. Can be prevented.

  Further, the support member has a mounting base attached to the base side or the vibration source side, and a support base provided in a facing manner apart from the mounting base, and the screw hole is provided in the support base. In addition, it is preferable that a portion of the posture holding member protruding outside the surging preventing member is accommodated in a space between the mounting base and the support base.

  According to this configuration, since the portion of the posture holding member that protrudes to the outside of the surging preventing member is accommodated in the space between the mounting base and the support base, the amount of screwing of the posture holding member using the space The posture holding member does not protrude from the mounting base and get in the way.

  Further, for the sake of completeness, the surging preventing member is arranged along the inner periphery of the coil spring winding as viewed from the direction in which the spring axis extends at least at the portion of the outer peripheral edge pressed against the coil spring winding. The sliding contact surface formed as described above can be provided. If it does so, it will become difficult to enter between windings compared with the surging prevention member with which the outer periphery edge was square, and it can stabilize vibration-proof performance more. In addition, since the contact area between the surging prevention member and the coil spring is relatively large, the contact resistance is increased accordingly, and the surging prevention performance can be improved.

  As described above, according to the vibration isolator of the present invention, an appropriate contact resistance of the surging preventing member with respect to the coil spring can be ensured by adjusting the posture holding member, and the surging between the windings of the coil spring can be ensured. Since the prevention member can be effectively prevented from entering, the anti-vibration performance can be stably exhibited.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  1 and 2 show an anti-vibration table A according to the present embodiment. For example, the anti-vibration table A is used when an outdoor unit of an air conditioner, which is a vibration source (not shown), is installed on a basic installation surface. Used for.

  The vibration isolator A includes a base 80 made of a rectangular frame fixed on the installation surface, and a base 81 having the same shape and the same size as the base 80 and arranged on the base 80 at a predetermined interval. The outdoor unit is mounted on the gantry 81. Between the base 80 and the base 81, in order to elastically support the base 81, a plurality of the same anti-vibration devices B are arranged in a well-balanced manner. Stopper mechanisms 82 for restricting the upward movement of each are disposed.

  As shown in FIGS. 3 to 5, each anti-vibration device B includes a first case 10 (first member) attached to a base 80 and a second case 20 attached to a base 81 made of a plastic processed product or the like. (Second member), metal coil spring 30, damping rubber 40 (surging prevention member), damping rubber adjusting bolt 50 (posture holding member) and the like are provided.

  The first case 10 has a substantially square plate-shaped first mounting base 11 fixed to the base 80, and a cylindrical first peripheral wall standing on the upper surface of the first mounting base 11 and opened upward. And a substantially disc-shaped support base 13 that is disposed in an opposing manner above the first mounting base 11 with the inside of the first peripheral wall portion 12 being vertically divided.

  In the four corners of the first mounting base 11, fastening holes 11a, 11a,... For penetrating bolts (not shown) that are fastened to the base 80 are formed. A relatively large diameter opening 11 b is formed at the center of the first mounting base 11.

  A screw hole 13a for supporting the damping rubber adjusting bolt 50 is opened at a substantially central portion of the support base 13, and a helical female screw is formed on the inner peripheral surface of the screw hole 13a. Details of the support base 13 will be described later.

  The second case 20 has substantially the same shape and the same size as the first mounting base 11, is suspended from the second mounting base 21 fixed to the gantry 81, and the lower surface of the second mounting base 21, and the lower part is open. And a cylindrical second peripheral wall portion 22. Fastening holes 21 a, 21 a,... Are inserted through the four corners of the second mounting base 21 for inserting bolts (not shown) that are fastened to the gantry 81.

  The second peripheral wall portion 22 of the second case 20 is formed with a smaller diameter than the first peripheral wall portion 12 of the first case 10, and the lower end portion of the second peripheral wall portion 22 enters the first peripheral wall portion 12. In this state, the second case 20 is disposed so as to be positioned above the first case 10.

  And between the 1st case 10 and the 2nd case 20, the spring axial center P1 is extended in a substantially perpendicular direction, and it is a coil so that it may overlap with the center axis line of each of the 1st surrounding wall part 12 and the 2nd surrounding wall part 22. A spring 30 is provided. The periphery of the coil spring 30 is surrounded by the first peripheral wall portion 12 and the second peripheral wall portion 22 that are alternately overlapped, and the upper end of the coil spring 30 is in contact with the lower surface of the second mounting base 21. Is in contact with the upper surface of the support base 13.

  Therefore, the coil spring 30 is covered with the first case 10 and the second case 20, and is configured so that foreign matter enters from the outside and does not bite into the coil spring 30.

  Four positioning bolts 60, 60,... Are fastened at equal intervals along the outer peripheral edge of the coil spring 30 on the upper surface of the support base 13 and the lower surface of the second mounting base 21, respectively. The upper and lower ends of the coil spring 30 are arranged inside the heads of the positioning bolts 60, 60,. Accordingly, the movement of the coil spring 30 in the horizontal direction is restricted by these positioning bolts 60, 60,.

  As described above, the second case 20 is elastically supported by the first case 10 by being connected via the coil spring 30, and when the outdoor unit is placed on the gantry 81, the coil spring 30 is loaded with the load. When the outdoor unit vibrates, the coil spring 30 expands and contracts, and transmission of vibration to the foundation is suppressed.

  However, when the frequency of the outdoor unit transmitted to the coil spring 30 approaches the natural frequency of the spring itself, a so-called surging phenomenon occurs in which the amplitude increases, and a damping rubber 40 is provided to prevent this.

  The damping rubber 40 is a member made of rubber having a hardness of Hs 80 to 40, for example, having a substantially cylindrical shape with a width of about 80 mm, a thickness of about 5 mm, and an outer diameter of about 50 mm (no load). As shown in FIGS. 4 and 5, the damping rubber 40 is placed inside the windings 31, 31,... Of the coil spring 30 with the rubber axis (cylinder shaft) P <b> 2 lying on its side so as to be substantially horizontal. At least a part of both side portions 41, 41 that are pushed in and face each other across the rubber axis P2 are wound on the windings 31, 31,... Of the coil spring 30 from a direction substantially orthogonal to the spring axis P1. The damping rubber 40 is deformed into an elliptical shape or an oval shape extending along the spring axis P1.

  Therefore, since the damping rubber 40 is constantly pressed inside the windings 31, 31,... Of the coil spring 30, a surging phenomenon occurs in the coil spring 30 due to the contact resistance due to the elastic repulsion force of the damping rubber 40. Generation | occurrence | production can be prevented effectively.

  A portion 42 (also referred to as a fixed end portion 42) that is connected to both side portions 41, 41 of the damping rubber 40 and is located on the lower end side of the coil spring 30 is attached to a substantially central portion of the upper surface of the support base 13 in this embodiment. It is clamped and fixed by a metal bracket 15.

  Specifically, the bracket 15 has a first sandwiching piece 15a having a strip shape, and a second sandwiching piece 15b having a strip shape and having a bent portion 16 that is bent one step higher in the middle portion. The first sandwiching piece 15a is fixed so as to be in close contact with the upper surface of the support base 13, while the second sandwiching piece 15b has its bent portion 16 positioned above the first sandwiching piece 15a. Each clamping piece 15a, 15b is arranged in a cross shape when viewed from above. Each clamping piece 15a, 15b is fastened and fixed to the support base 13 by the positioning bolt 60 at the both ends, and the positioning bolt 60 on the support base 13 side is commonly used as a fastening bolt for each clamping piece 15a, 15b. Yes.

  And the fixed end part 42 of the damping rubber 40 is inserted | pinched between the bending part 16 of the 1st clamping piece 15a and the 2nd clamping piece 15b. A through hole 43 is formed at a substantially central portion in the width direction of the fixed end portion 42 of the damping rubber 40 so as to overlap the screw hole 13a of the support base 13 in the vertical direction so that the damping rubber adjusting bolt 50 is inserted. Yes. Similarly, through holes are formed in substantially the center portions of the holding pieces 15a and 15b of the bracket 15, respectively.

  Even if such a through-hole 43 is formed in the damping rubber 40, since it is formed in a portion that is securely clamped and fixed by the bracket 15, the durability is not greatly impaired. Moreover, since the lower end part of the coil spring 30 is received on both sides of each clamping piece 15a, 15b, the bracket 15 is fixed firmly and the fixed end part 42 is also difficult to loosen.

  The damping rubber 40 is assembled with a damping rubber adjusting bolt 50 in order to prevent the coil spring 30 from entering between the windings 31, 31,.

  That is, since the damping rubber 40 is pressed against the windings 31, 31,... Of the coil spring 30 from a direction substantially orthogonal to the spring axis P1, the windings 31, 31 adjacent to each other when the coil spring 30 contracts. There is a possibility that a part of the damping rubber 40 may enter between (see FIG. 10). Then, when the coil spring 30 contracts, an elastic resistance due to the compression of the damping rubber 40 is added, and the coil spring 30 apparently has a larger spring constant than the coil spring 30 contracts normally. Will be unstable.

  Therefore, the damping rubber adjustment bolt 50 holds the posture of the damping rubber 40 so that the length of the damping rubber 40 on the long axis side, that is, the length of the coil spring 30 in the direction of the spring axis P1 does not become smaller than a predetermined dimension.

  Specifically, the damping rubber adjusting bolt 50 includes a knob 51 and a long shaft 52 formed integrally with the knob 51, and the outer peripheral surface of the shaft 52 covers the entire area. A helical male screw is formed. The damping rubber adjusting bolt 50 is screwed into the screw hole 13 a from the lower surface of the support base 13 in a state where the fixing nut 53 is screwed to the shaft portion 52, and the through hole of the bracket 15 and the damping rubber 40. An intermediate portion of the shaft portion 52 is supported by the support base 13 so as to extend in a substantially vertical direction through the through hole 43. The fixing nut 53 is used for fixing the damping rubber adjusting bolt 50 to the support base 13.

  A hexagonal cap nut 54 having a convex curved surface at the head is fastened to the tip of the shaft portion 52 that protrudes inside the damping rubber 40, and more specifically, the upper end portion of the damping rubber 40, specifically, both sides of the damping rubber 40. The head of the hexagonal cap nut 54 is in contact with the inner surface of a portion 45 (also referred to as an opposed end 45) that is continuous with the portions 41 and 41 and faces the fixed end 42, and the damping rubber 40 is The damping rubber adjusting bolt 50 is supported so that the length between the fixed end portion 42 and the opposed end portion 45 does not become smaller even if it becomes larger than a predetermined dimension.

  Therefore, it is possible to restrict the side portions 41, 41 of the damping rubber 40 in contact with the windings 31, 31,... Of the coil spring 30 from spreading more than necessary in the horizontal direction, and to attenuate when the coil spring 30 contracts. It is possible to effectively prevent a part of the rubber 40 from entering between the windings 31, 31,.

  On the other hand, even if a part of the damping rubber 40 enters between the windings 31, 31,..., When the coil spring 30 is stretched, the damping rubber 40 can be easily removed by the contact resistance. Therefore, a part of the damping rubber 40 that has entered between the windings 31, 31,... Is pulled out immediately, and the destabilization of the vibration proof performance by the damping rubber 40 is prevented with more certainty. It has become.

  The predetermined dimension can be freely changed in size by changing the screwing amount of the damping rubber adjusting bolt 50 into the screw hole 13a. Therefore, the predetermined dimension may be appropriately adjusted according to the state of the coil spring 30 and the like.

  On the other hand, the portion of the damping rubber adjusting bolt 50 protruding below the support base 13 includes a knob 51 and has a margin in the vertical direction in the space 70 between the support base 13 and the first mounting base 11. Contained in state. Therefore, the damping rubber adjusting bolt 50 does not protrude out of the vibration isolator B and does not get in the way. Further, the first mounting base 11 is devised so that the adjustment margin of the damping rubber adjusting bolt 50 is increased by the thickness of the first mounting base 11 by the opening 11b.

  Further, as shown in FIG. 6, since the damping rubber 40 is held in the posture by the damping rubber adjusting bolt 50, even if the coil spring 30 contracts, the damping rubber 40 does not shrink following the contraction, and the winding The pressing state on the lines 31, 31,... Does not change. Therefore, the contact range between the coil spring 30 and the damping rubber 40 is expanded by the amount of contraction of the coil spring 30 and the contact resistance is increased. As a result, the amount of attenuation is also advantageous.

  FIG. 7 shows another embodiment of the damping rubber 40. Here, the damping rubber 40 has inner peripheral edges at both ends in the direction of the rubber axis P2 as viewed from the direction in which the spring axis P1 extends, of the windings 31, 31,. The slidable contact surfaces 46 and 46 are formed so as to be curved along the circumference. Therefore, when the damping rubber 40 is disposed inside the windings 31, 31,... Of the coil spring 30, as described above, both side portions 41, 41 of the damping rubber 40 are separated from the sliding contact surfaces 46, 46. It is pressed against the inner surface of the windings 31, 31,.

  If it does so, compared with the case where the outer periphery part is square, it will become difficult to enter between winding 31,31, ..., and it can stabilize vibration-proof performance more. Further, since the contact range between the damping rubber 40 and the coil spring 30 becomes relatively large, the contact resistance is increased accordingly, and the surging prevention performance can be improved.

  In addition, the vibration isolator concerning this invention is not limited to the said embodiment, The other various structure is included.

That is, the damping rubber 40 is not necessarily a member having a substantially cylindrical shape from the beginning. For example, if a belt-like rubber is bent and both end portions in the longitudinal direction are fixed with brackets 15, a substantially cylindrical member can be obtained.
The second peripheral wall portion 22 of the second case 20 is formed to have a larger diameter than the first peripheral wall portion 12 of the first case 10 so that the upper end portion of the first peripheral wall portion 12 enters the second peripheral wall portion 22. You may arrange in. If it does so, invasion of the foreign material from the upper part, rain water, etc. can be prevented still more effectively.

  Alternatively, the anti-vibration device B can be mounted upside down with the second case 20 on the base 80 side and the first case 10 on the base 81 side. The support base 13 can be provided in either the first case 10 or the second case 20.

  It is preferable to form an opening in the center of the second mounting base 21 so that the opposing end 45 of the damping rubber 40 can enter. The allowable shrinkage range of the coil spring 30 is increased by the thickness of the second mounting base 21, and the adjustment range of the damping rubber adjusting bolt 50 is also increased.

  The length on the long axis side of the surging preventing member may be maintained at a predetermined dimension. For example, a through hole is also formed in the opposing end portion 45 of the damping rubber 40, and the tip end portion of the damping rubber adjusting bolt 50 is inserted therein, and the opposing end portion 45 is sandwiched between the hexagonal bag nut 54 and the nut. If it does so, since the diameter of the major axis side of the attenuation | damping rubber 40 can be made small and the both sides 41 and 41 can also be strongly pressed against the coil spring 30, the adjustment range of attenuation amount will be expanded.

It is a front view of the vibration isolator to which the vibration isolator of the present invention is applied. It is a top view of the vibration isolator to which the vibration isolator of the present invention is applied. It is the figure (plan view) which looked at the vibration isolator of this invention from the upper direction. It is the XX sectional view taken on the line of FIG. It is the YY sectional view taken on the line of FIG. In FIG. 5, it is a figure which shows the state in which the load was added to the vibration isolator. It is the top view which showed the principal part, in order to demonstrate another embodiment of a surging prevention member. It is explanatory drawing of the conventional vibration isolator. It is explanatory drawing of the conventional vibration isolator. It is a schematic sectional drawing which shows the principal part of the conventional vibration isolator.

10 First case (first member)
11 First mounting base 13 Support base 13a Screw hole 15 Bracket 20 Second case (second member)
21 Second mounting base 30 Coil spring 31 Winding 40 Damping rubber 41 Side portion 42 Fixed end portion 43 Through hole 45 Opposing end portion 46 Sliding contact surface 50 Damping rubber adjusting bolt (posture holding member)
52 Shaft 70 Space B Vibration Isolator P1 Spring Center P2 Rubber Center (Cylinder Shaft)

Claims (4)

A first member attached to the foundation side, a second member located above the first member and attached to the vibration source side, and a spring axis between the first member and the second member is substantially vertical. A vibration isolator that includes a coil spring arranged to extend in a direction, supports a vibration source by expansion and contraction of the coil spring, and suppresses transmission of vibration to a foundation,
The coil spring is pressed with a surging preventing member having elasticity from a direction substantially orthogonal to the spring axis ,
The surging preventing member is made of a rubber member having a substantially cylindrical shape, and is disposed inside the coil spring in a state where the cylinder axis is lying horizontally so as to be substantially horizontal, and the first member serving as a support member And the fixed end portion of the surging preventing member is fixed to one of the second members, and at least a part of both side portions facing each other across the cylinder shaft is pressed against the winding of the coil spring. , It is deformed into a long oval or oval shape vertically,
In this surging prevention member, a posture holding member that holds the posture is assembled to the support member so as to prevent the coil spring from entering between the windings when the coil spring contracts ,
The posture holding member supports the opposite end so that the length between the fixed end and the opposite end facing the fixed end does not become smaller than a predetermined dimension. Anti-vibration device. The vibration isolator according to claim 1,
The posture holding member is made of a long shaft-like member having a male screw on a peripheral surface, is inserted through a through hole formed in a fixed end portion of the surging preventing member, and extends in a substantially vertical direction. A portion protruding outward is screwed into and supported by a screw hole provided in the support member, while a tip portion of the portion protruding inward of the surging prevention member is an inner surface of the opposite end portion of the surging prevention member Anti-vibration device characterized by being in contact with The vibration isolator according to claim 2,
The support member has a mounting base that is attached to the foundation side or the vibration source side, and a support base that is provided so as to face away from the mounting base.
The anti-vibration method is characterized in that the screw hole is provided in the support base, and a portion of the posture holding member protruding outside the surging prevention member is accommodated in a space between the mounting base and the support base. apparatus. In the vibration isolator as described in any one of Claims 1-3,
The surging preventing member is slidably contacted with the inner periphery of the coil spring winding as viewed from the direction in which the spring axis extends in at least the portion of the outer peripheral edge pressed against the coil spring winding. An anti-vibration device having a surface.

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