JP2012193814A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device which is easily manufactured, compact, easily attachable, and applicable to all technical fields such as a building and a wheel, and has large vibration absorption capability for its size.SOLUTION: This base isolation device includes an inner member 10, a surrounding member 20, and vibration absorbing springs 30 externally fitted to the inner member 10 and internally inserted into the surrounding member 20, wherein the vibration absorbing spring 30 is a non-circular annular member. The vibration absorbing spring 30 can be easily manufactured because a wire only has to be shaped into an annular form. When vibration external force is applied to the inner member 10 or the surrounding member 20, the vibration absorbing spring 30 is deformed, and vibration energy is absorbed by generation of stress against the deformation. Since the vibration absorbing spring 30 is flexibly deformed in a sealed space, large absorption energy can be ensured and a vibration absorbing effect is high. The vibration absorbing spring 30 achieves vibration absorbing action by deformation even when external force acts from any direction because of being non-circular, and can thereby absorb omnidirectional vibration.

Description

  The present invention relates to a vibration isolator. More specifically, buildings, tanks and other buildings, power supplies, machinery, piping, and wiring are attached to foundations, soils, buildings, and other components to absorb earthquakes, mechanical vibrations, and other vibrations, and wheels. The present invention relates to a vibration isolator that absorbs vibration during traveling.

The following technique is used for the vibration proofing / vibration control method in the fields of buildings, buildings, machines, piping, and the like (Non-Patent Document 1).
1) To suppress the influence of vibration, such as a damper 2) To be elastically supported for vibration isolation, as a vibration isolator or vibration isolation mount 3) To reduce the response of the vibration body, eliminate rattling and loosening Fastening 4) As an automatic control method, a vibration input is detected and attenuated by reducing excitation force and response, or generating reverse force.

However, the conventional example has the following problems.
The conventional technique (1) uses a damper or the like, so that the apparatus is bulky and the application place is limited in terms of space.
In the prior art (2), for example, as shown in FIG. 16, a rubber mount 103 is inserted between a foundation 101 and a mounting member 102 such as a building or machine, and an anchor bolt 104 and a nut 105 are interposed between the two members. It has been concluded.
This rubber mount system can absorb vibrations with small vibrations, but cannot absorb large vibrations, so there is a limit to the vibration-proofing ability, and there is a problem that the rubber mount has a life span and the ability decreases with time.
In the prior art (3), for example, as shown in FIG. 17, an attachment member 102 placed on a foundation 101 is fixed with an uncassette 106, and a spring washer 107 is passed through a screw portion of the uncassette 106 with a nut 108. It is configured to tighten. When the uncassette 106 is fixed to the base 101, a pilot hole is made in the base 101. If the pilot hole can be manually or punched, it may not be straight due to the material variation of the base. In this case, since the uncassette 106 is attached with an inclination θ, a gap g is generated even if the nut 108 is tightened, and the uncassette 106 cannot be securely tightened and is easily loosened.
In addition, as shown in FIG. 18, there is a method in which the piping 110 is attached to a mount 112 attached to the wall surface of the building 111 with a band 113 or the like. Although there is a vibration effect, it cannot exert a great vibration-proofing force, leading to a pipe rupture accident in the event of an earthquake or the like.
The conventional example of (4) requires a sensor as a vibration detector as a control element, an inertial mass for damping, an actuator as an operating force generator, a servo mechanism for control, a power source, etc. It becomes a large mechanism. For this reason, it can be used only when there is enough space and cost.
(5) Furthermore, none of the prior arts (1) to (4) described above has a compactness that can be incorporated into a wheel or the like and a degree of freedom of incorporation.

In order to solve these problems, the present inventor has devised a vibration isolator described in Patent Document 1.
As shown in FIG. 19, the vibration isolator includes an inner member 114, a surrounding member 115, and a vibration absorbing spring 116 that is externally inserted into the inner member 114 and inserted into the surrounding member 115. The vibration absorbing spring 116 is a winding spring having a non-circular shape such as a triangle or an ellipse.
When a vibration external force is applied to the inner member 114 or the surrounding member 115, the vibration absorbing spring 116 is deformed, and vibration energy can be absorbed by generation of stress against the deformation. Since the vibration absorbing spring 116 bends and deforms in a sealed space surrounded by the inner member 114 and the surrounding member 115, the absorbed energy is increased and the vibration absorbing effect is high.
Therefore, it is compact and can be easily mounted, and can be applied in all technical fields such as buildings and wheels. In addition, the vibration isolator has a large vibration absorbing capacity for its size.

  However, there is a problem that a non-circular winding spring is difficult to manufacture compared to a general circular winding spring.

Japanese Patent No. 4366365

Mechanical Engineering Handbook Engineering Chapter C8 Environmental Equipment 207-208 Japan Society of Mechanical Engineers

  In view of the above circumstances, the present invention is easy to manufacture, is compact and can be easily mounted, can be applied in all technical fields such as buildings and wheels, and has a large vibration absorption capacity for its size. An object is to provide a vibration isolation device.

The vibration isolator of the first invention is an inner member attached to the vibration source side member or the vibration body side member, an enclosure member attached to the vibration body side member or the vibration source side member, extrapolated to the inner member, and the enclosure And a vibration absorbing spring inserted in the member, wherein the vibration absorbing spring is a non-circular annular member.
The vibration isolator according to a second aspect of the present invention is characterized in that, in the first aspect, a groove is formed in the surrounding member, and a protruding portion of the vibration absorbing spring is fitted into the groove.
A vibration isolator according to a third aspect of the present invention is the first or second aspect of the invention, comprising a plurality of the vibration absorbing springs, wherein the plurality of vibration absorbing springs are inserted at different angles in the circumferential direction for each of the vibration absorbing springs. It is characterized by.
According to a fourth aspect of the present invention, there is provided the vibration isolator according to the first, second or third aspect, wherein the vibration absorbing spring is held perpendicular to the outer peripheral surface of the inner member or the inner peripheral surface of the surrounding member. It is characterized by providing.
A vibration isolator according to a fifth aspect of the present invention, in the first, second, third or fourth aspect, absorbs vibration in a direction perpendicular to the vibration absorption direction of the vibration absorbing spring between the inner member and the surrounding member. A spring is provided.

According to the first aspect of the invention, since the vibration absorbing spring is a non-circular annular member, it is only necessary to process the wire into an annular shape, so that the manufacture is easy. Further, when a vibration external force is applied to the inner member or the surrounding member, the vibration absorbing spring inserted between the inner member and the surrounding member is deformed, and the vibration energy is absorbed by the generation of stress against the deformation. Since the vibration absorbing spring is bent and deformed in a sealed space surrounded by the inner member and the surrounding member, a large absorption energy can be obtained and the vibration absorbing effect is high. Furthermore, since the vibration absorbing spring is non-circular, the vibration absorbing action by deformation is exerted regardless of the direction in which the external force acts, so that omnidirectional vibration absorption is possible.
According to the second aspect of the present invention, the position of the vibration absorbing spring can be fixed so as not to rotate in the circumferential direction of the surrounding member by fitting the protruding portion of the vibration absorbing spring into the groove formed in the surrounding member. Further, since it is only necessary to form a groove in the surrounding member, the structure is simple and the manufacture is easy.
According to the third invention, since the plurality of vibration absorbing springs are inserted at different angles in the circumferential direction, they contact the outer peripheral surface of the inner member and the inner peripheral surface of the surrounding member at a plurality of locations in the circumferential direction. For this reason, the azimuths that come into contact with each other increase, and even if the vibration external force acts from any direction, the deformation of the vibration absorbing spring is equalized, and a high vibration absorbing ability can always be exhibited.
According to the fourth aspect of the invention, since the vibration absorbing spring can be held perpendicular to the outer peripheral surface of the inner member or the inner peripheral surface of the surrounding member, the inner member is inclined with respect to the surrounding member by the vibration external force. However, since the vibration absorbing spring does not slide obliquely with respect to the inner member or the surrounding member, the vibration external force works from the side of the vibration absorbing spring and a sufficient restoring force is obtained. Further, since the plurality of vibration absorbing springs do not fall apart, an even restoring force can be obtained. Therefore, vibration can be reliably absorbed.
According to the fifth invention, the vibration absorbing spring absorbs vibration in one direction, and vibration in a direction orthogonal thereto, for example, vibration in the vertical direction with respect to the horizontal direction can be absorbed by another spring. Get higher.

It is explanatory drawing of the basic composition of the vibration isolator of this invention, Comprising: (A) is front view sectional drawing, (B) is a top view. It is explanatory drawing of the vibration absorption principle of the vibration isolator of this invention, Comprising: (A) is a top view of the vibration absorbing spring of a normal state, (B) is a top view of the vibration isolator when a vibration external force is added. It is explanatory drawing of the vibration absorption principle of the vibration isolator which concerns on other embodiment of this invention, Comprising: (A) is a top view of the vibration absorbing spring of a normal state, (B) is a vibration isolator when a vibration external force is added. FIG. (I) is explanatory drawing of the vibration isolator which inserted the vibration-absorbing spring toward the same direction, (ii) is explanatory drawing of the vibration-isolating device inserted changing the angle for every vibration-absorbing spring. (A) is explanatory drawing of the vibration isolator which does not insert a spring guide, (B) is explanatory drawing of the vibration isolator which inserted the spring guide. It is assembly explanatory drawing of the vibration isolator unit of this invention. It is a top view of the vibration isolator unit of this invention. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. It is explanatory drawing of the vibration absorption principle of the vibration isolator unit of this invention. It is an attachment state sectional view of the vibration isolator which concerns on 1st Embodiment of this invention. It is attachment state sectional drawing of the vibration isolator which concerns on 2nd Embodiment of this invention. It is an attachment state sectional view of the vibration isolator which concerns on 3rd Embodiment of this invention. It is attachment state sectional drawing of the vibration isolator which concerns on 4th Embodiment of this invention. It is attachment state sectional drawing of the vibration isolator which concerns on 5th Embodiment of this invention. It is an attachment state sectional view of the vibration isolator which concerns on 6th Embodiment of this invention. It is explanatory drawing of the conventional rubber mount type vibration proof structure. It is explanatory drawing of the conventional uncassette. It is explanatory drawing of the conventional piping attachment structure. It is explanatory drawing of the conventional vibration isolator, Comprising: (A) is front view sectional drawing, (B) is a top view.

Next, an embodiment of the present invention will be described with reference to the drawings.
(Basic configuration)
First, the basic configuration of the vibration isolator of the present invention will be described based on FIG.
Reference numeral 10 denotes an inner member, which is a member that extrapolates a vibration absorbing spring 30 to be described later and transmits vibration external force to the vibration absorbing spring 30 or receives vibration from the vibration absorbing spring 30. The inner member 10 is a solid member or a hollow member. Examples of solid members include bolts, uncassettes, and axles. Examples of the hollow member include piping such as a gas pipe and wiring pipes. In short, the outer shape may be a circular member or a polygonal member similar to this, and members other than the above examples can be used as long as this requirement is satisfied.

  Reference numeral 20 denotes a surrounding member that accommodates a vibration absorbing spring 30 to be described later, and transmits a vibration external force to the vibration absorbing spring 30 or receives vibration from the vibration absorbing spring 30. The surrounding member 20 may have an inner peripheral surface that is a cylindrical surface or a polygonal surface that approximates the cylindrical surface, and the outer peripheral surface may have an arbitrary shape. Even if the surrounding member 20 lacks a part in the circumferential direction, the surrounding member 20 may not completely surround the vibration absorbing spring 30 as long as it is in contact with the vibration absorbing spring 30 described later. In many cases, a cylindrical member is used as the surrounding member 20, but in the case of a wheel, a hollow portion formed in the boss portion corresponds.

Reference numeral 30 denotes a vibration absorbing spring. The vibration absorbing spring 30 is inserted into the inner member 10 and inserted into the surrounding member 20. That is, it is inserted into a space surrounded by the inner member 10 and the surrounding member 20, and is in contact with the inner wall surface and the outer wall surface. The vibration absorbing spring 30 is a non-circular annular member, and is formed in a polygonal shape, an elliptical shape, or the like in plan view. In short, what is necessary is just to contact the outer peripheral surface of the inner member 10 and the inner peripheral surface of the surrounding member 20 at two or more points.
A plurality of vibration absorbing springs 30 are inserted, and the stress with respect to the vibration external force can be changed by increasing or decreasing the number. Of course, only one may be inserted.

  The vibration absorbing spring 30 in the present embodiment is a triangular annular member. Triangular annular members are easy to manufacture because they can be obtained simply by bending them at two locations that divide the wire into three equal parts. Further, since the points in contact with the inner member 10 or the surrounding member 20 are even at 120 ° intervals in the circumferential direction, vibrations in all directions can be absorbed in a balanced manner. Furthermore, since the space between the inner member 10 and the surrounding member 20 can be made larger than in the case of using a more polygonal shape, vibration having a large amplitude can be absorbed.

An anti-rotation groove 21 is formed in the surrounding member 20 in the axial direction, and the vibration absorbing spring 30 is inserted so that the protruding portion 31 fits into the anti-rotation groove 21. The protruding portion 31 of the vibration absorbing spring 30 is one vertex when the vibration absorbing spring 30 is polygonal. In short, it is a portion protruding outward in the vibration absorbing spring 30 and a portion that can be fitted into the rotation prevention groove 21.
By fitting the protruding portion 31 of the vibration absorbing spring 30 into the rotation preventing groove 21, the position of the vibration absorbing spring 30 can be fixed so as not to rotate in the circumferential direction of the surrounding member 20. Further, since it is only necessary to form a groove in the surrounding member 20, the structure is simple and the manufacture is easy.

As in the present embodiment, the triangular vibration absorbing spring 30 obtained by bending a wire at two locations has a shape in which the apex where both ends of the wire are combined protrudes outward compared to the apex formed by other bending. ing. Therefore, what is necessary is just to fit the anti-rotation groove | channel 21 by making the vertex into the protrusion part 31. FIG.
The anti-rotation groove 21 may penetrate the outer peripheral surface and the inner peripheral surface of the surrounding member 20, or may be formed only on the inner peripheral surface.
Further, the method for fixing the vibration absorbing spring 30 is not limited to the method using the rotation preventing groove 21, and may be fixed by an appropriate method according to the embodiment.

  In the above-described vibration isolator, when the inner member 10 is attached to a vibration source side member (for example, a foundation or a machine or building that generates or transmits vibration), the surrounding member 20 is a vibration body side member (for example, , Buildings and machinery on foundations, piping attached to buildings, etc.). Conversely, when the surrounding member 20 is attached to the vibration source side member, the inner member 10 is attached to the vibration body side.

(Principle of vibration absorption)
Next, the vibration absorption principle will be described.
In FIG. 2, it is assumed that a vibration external force Fa is applied to the inner member 10. The direction of the vibration external force Fa is directed to the linear portion of the triangular vibration absorbing spring 30. Therefore, the inner member 10 pushes the straight portion. Then, the straight line portion of the vibration absorbing spring 30 is curved in an arc shape as shown by a solid line from the normal state of the two-dot chain line (B). A reverse force acts on the inner member 10 due to the restoring force of the vibration absorbing spring 30 generated by this deformation, and it is returned to its original position.
At this time, depending on the damping coefficient determined by the vibration absorbing spring 30 and other conditions, although the amplitude is attenuated, the inner member 10 moves to a position that has gone too far from the original position.

In this case, a vibration external force Fb in the opposite direction is applied to the inner member 10. The direction of the vibration external force Fb is directed to the apex of the triangular vibration absorbing spring 30. Therefore, the inner member 10 pushes the two straight portions forming the apex. Then, the apex of the vibration absorbing spring 30 is deformed so that the angle increases from the normal state. A reverse force acts on the inner member 10 due to the restoring force of the vibration absorbing spring 30 generated by this deformation, and it is returned to its original position.
Also at this time, although the amplitude is attenuated depending on the attenuation coefficient, the inner member 10 moves to a position that has gone too far from the original position.
By repeating the above movement, the amplitude is gradually attenuated and the vibration is absorbed.

When a vibration external force is applied from a direction other than Fa and Fb, the vibration is absorbed by the combined deformation of the two patterns. Therefore, on the plane including the vibration absorbing spring 30, even if a vibration external force from any direction of 360 ° is applied, the vibration absorbing spring 30 is deformed to absorb the vibration. That is, vibration can be absorbed in all directions.

As shown in FIG. 3, the vibration absorbing spring 30 may have a shape in which a triangular straight portion is bent inward in a normal state (A). Even in this case, even if vibration external forces Fa and Fb and vibration external forces acting from other directions are applied based on the same principle as described above, the vibration absorbing spring 30 can be deformed to absorb vibration.
In the case of this shape, since the straight portion is curved inward, a greater restoring force can be generated with respect to the external force that curves the straight portion outward. That is, greater vibration energy can be absorbed by the vibration absorbing spring 30. In addition, since the space between the inner member 10 and the surrounding member 20 can be increased by the amount of the straight portion curved inward, vibration having a large amplitude can be absorbed.

The above explanation of the principle is an example in which a vibration external force is applied to the inner member 10, but the same applies when a vibration external force is applied to the surrounding member 20, and an equivalent vibration absorbing ability can be exhibited.
In order to avoid resonance, it is preferable to remove the natural frequency of the vibration absorbing spring 30 as much as possible from the frequency of the assumed external vibration force.

The above-described vibration absorbing effect is performed by the vibration absorbing spring 30 being bent and deformed in a state of being in close contact with the wall surface in a donut-shaped cylindrical space between the inner peripheral surface of the surrounding member 20 and the outer peripheral surface of the inner member 10. Since the bending deformation requires a larger force than the bending deformation or the like, the absorbed energy can be increased for using a small member, and hence the vibration absorbing effect is enhanced.
In addition, the required members are only three members, that is, the inner member 10, the surrounding member 20, and the vibration absorbing spring 30, and the structure is simple, so that there is an advantage that it can be manufactured easily and inexpensively. Moreover, since it is very compact, it can be applied to a small portion of the mounting space and can be applied to many industrial fields.

  The vibration isolator shown in FIG. 4 (i) includes a plurality of vibration absorbing springs 30, and the protruding portions 31 of all the vibration absorbing springs 30 are fitted into one rotation-preventing groove 21 formed in the surrounding member 20. Therefore, all the vibration absorbing springs 30 are inserted in the same direction. That is, the positions where all the vibration absorbing springs 30 are in contact with the inner member 10 and the surrounding member 20 are the same positions in plan view.

  On the other hand, as shown in FIG. 4 (ii), if two anti-rotation grooves 21 are formed in the surrounding member 20 and the anti-rotation grooves 21 into which the protrusions 31 are fitted for each of the vibration absorbing springs 30 are alternately arranged, each step The vibration absorbing spring 30 is inserted at a different angle in the circumferential direction. As a result, the outer peripheral surface of the inner member 10 and the inner peripheral surface of the surrounding member 20 are contacted at a plurality of locations in the circumferential direction, so that the azimuth to be contacted increases and the vibration absorbing spring no matter which direction the vibration external force acts from. The 30 deformations are equalized, and a high vibration absorption capability can always be exhibited.

When using the triangular vibration absorbing spring 30 as in this embodiment, if the two anti-rotation grooves 21 are formed at positions rotated by 60 °, the vibration absorbing springs 30 at each stage are arranged symmetrically. The position in contact with the inner member 10 and the surrounding member 20 is preferable because the balance is improved.
In addition, it is good also as embodiment which forms more anti-rotation grooves 21 and changes the angle of the vibration absorption spring 30 more finely.
Further, in each of the above drawings, the wire diameter of each spring material when using a plurality of anti-vibration springs 30 is basically the same size, but consideration must be given to avoid resonance due to earthquakes, mechanical vibrations, and other vibrations that are external forces. As a countermeasure in such a case, the wire diameter of the spring material may be appropriately changed for each spring according to the condition. Further, in each of the embodiments described above, a plurality of triangular vibration absorbing springs are assumed. However, it is possible to exert a vibration absorbing effect by using a single triangular winding spring. Of course, in that case, the anti-rotation groove 21 is unnecessary. The vibration absorbing spring in the present invention is characterized by a non-circular shape, and various polygon springs other than those shown are also included in the present invention.

  As shown in FIG. 5A, since the vibration absorbing spring 30 is a flat member, the inner member 10 is surrounded by the vibration external force only by being inserted into the space surrounded by the inner member 10 and the surrounding member 20. When tilted with respect to 20, it tilts with respect to the outer peripheral surface of the inner member 10 and the inner peripheral surface of the surrounding member 20. When a plurality of vibration absorbing springs 30 are inserted, each of them is separated and tilted at different angles. Since the vibration absorbing force does not act on the inclined vibration absorbing spring 30 from the side, a sufficient restoring force cannot be obtained. In addition, when the plurality of vibration absorbing springs 30 are separated, an equal restoring force cannot be obtained. Therefore, the vibration external force cannot be sufficiently absorbed.

Therefore, as shown in FIG. 5B, the spring guide 40 is inserted into the inner member 10, and the vibration absorbing spring 30 is inserted into the spring guide 40. The spring guide 40 is a cylindrical member, and the inner diameter of the spring guide 40 is substantially the same as the outer diameter of the inner member 10 and can be inserted into the inner member 10 so that there is no backlash. Further, flange portions are formed at the upper end and the lower end, and the interval between the flange portions is substantially equal to the dimension obtained by multiplying the diameter of the wire rod of the vibration absorbing spring 30 to be inserted by the number of the vibration absorbing springs 30. The spring 30 can be held in a stacked state.
By the spring guide 40, the vibration absorbing spring 30 is held so as to be perpendicular to the outer peripheral surface of the inner member 10. Therefore, even if the inner member 10 is tilted with respect to the surrounding member 20 due to the vibration external force, the vibration absorbing spring 30 does not slide obliquely with respect to the inner member 10, so the vibration external force works from the side of the vibration absorbing spring 30 and is sufficient. Restoring power is obtained. Further, since the plurality of vibration absorbing springs 30 do not fall apart, a uniform restoring force can be obtained. Therefore, vibration can be reliably absorbed.

  Further, a spring guide may be provided on the surrounding member 20 side and the vibration absorbing spring 30 may be held so as to be perpendicular to the inner peripheral surface of the surrounding member 20. In this case, even if the inner member 10 is inclined with respect to the surrounding member 20 due to the vibration external force, the vibration absorbing spring 30 does not slide obliquely with respect to the surrounding member 20, so that the same effect can be achieved.

  Note that spring guides may be provided on both the inner member 10 side and the surrounding member 20 side. Further, the spring guide is not limited to the shape described above, and any spring guide may be used as long as it holds the vibration absorbing spring 30 so as to be perpendicular to the outer peripheral surface of the inner member 10 or the inner peripheral surface of the surrounding member 20.

(Vibration isolation device unit)
Next, the vibration isolator unit A used for vibration isolation of the power supply device and the like will be described.

  As shown in FIGS. 6, 7, and 8, a lower spring 51 is inserted into a main body 20 that is a bottomed cylindrical enclosure member, and a shaft 10 that is an inner member is inserted from above the lower spring 51. Since the lower spring 51 supports the weight of the power supply device and needs to absorb the vibration in the vertical direction, a strong spring is used. The lower end of the shaft 10 in contact with the lower spring 51 is a dome-shaped head 11, the shaft 10 can be tilted with respect to the main body 20 around the head 11, and the head 11 is always at the lower spring 51. Can be contacted with. The shaft 10 can move up and down within the main body 20.

  An upper spring 52 is inserted into the shaft 10 and a spring guide 40 is inserted from above. Therefore, the upper spring 52 is sandwiched between the head 11 of the shaft 10 and the spring guide 40. Note that the upper spring 52 may not be inserted.

  A plurality of vibration absorbing springs 30 are inserted into the spring guide 40. The spring guide 40 is a cylindrical member, and the inner diameter of the spring guide 40 is substantially the same as the outer diameter of the shaft 10 and can be inserted so that there is no backlash with respect to the shaft 10. The spring guide 40 is formed with a grease holding groove 41 capable of holding grease or the like on the inner peripheral surface so that the spring guide 40 can slide smoothly with respect to the shaft 10. Further, flange portions are formed at the upper end and the lower end, and the interval between the flange portions is substantially equal to the dimension obtained by multiplying the diameter of the wire rod of the vibration absorbing spring 30 to be inserted by the number of the vibration absorbing springs 30. 30 can be held in a stacked state.

  The vibration absorbing spring 30 is a triangular annular member. Two anti-rotation grooves 21 are formed in the main body 20 in the axial direction, and the two anti-rotation grooves 21 are formed at positions rotated by 60 °. Each of the plurality of vibration absorbing springs 30 is alternately fitted at one apex 31 in the two anti-rotation grooves 21, and the vibration absorbing springs 30 of each step are inserted at different angles in the circumferential direction.

  The main body 20 is formed with a vibration absorbing spring holding portion 22 having a large inner diameter, and the vibration absorbing spring 30 is inserted into the vibration absorbing spring holding portion 22. The vertical dimension of the vibration absorbing spring holding portion 22 is substantially equal to the dimension obtained by multiplying the diameter of the wire rod of the vibration absorbing spring 30 to be inserted by the number of the vibration absorbing springs 30 so that the vibration absorbing spring 30 does not escape vertically. The rotation prevention groove 21 is formed at the same vertical position as the vibration absorbing spring holding portion 22.

A main body lid 23 is fixed to the upper end of the main body 20 with a bolt, and a vibration absorbing spring 30 is enclosed in the main body 20. Further, the main body lid 23 holds the vibration absorbing spring 30 so as not to escape upward.
The main body lid 23 is formed with a circular hole in the center of the upper surface, and the shaft 10 is passed through the hole. The diameter of the hole of the main body lid 23 is larger than the diameter of the shaft 10 so that the shaft 10 can be inclined with respect to the main body 20.

In the vibration isolator unit A, the main body 20 is fixed to the base base, and the power supply device side mounting plate C is fixed to the shaft 10.
A step portion 12 having a smaller diameter is formed in a portion of the shaft 10 protruding above the main body lid 23, and a mounting plate C having a hole having a diameter slightly larger than the diameter of the step portion 12 is provided above the shaft 10. Has been inserted from. Therefore, the mounting plate C is supported by the step portion 12 of the shaft 10.
A pressing spring 53 is inserted into the shaft 10 from above the mounting plate C, and a nut is screwed into a female screw formed at the upper end of the shaft 10 so that the mounting plate C is pressed by the pressing spring 53. A washer is inserted between the mounting plate C and the presser spring 53 and between the presser spring 53 and the nut. Also, a recess 13 into which a spanner or the like is inserted or a through hole 14 into which a rod can be inserted is machined into the shaft 10 so that the shaft 10 does not rotate when being fixed with a nut.
The power supply device is attached to and supported by the vibration isolator unit A at the four corners of the bottom surface, for example.

Next, the principle of vibration absorption of the vibration isolator unit A will be described.
As shown in FIG. 9, when a horizontal vibration external force is applied to the foundation base or the power supply device due to an earthquake or the like, the shaft 10 swings with respect to the main body 20 around the head 11. By this swinging, a force from the side acts on the vibration absorbing spring 30 and the vibration absorbing spring 30 is deformed, so that vibration can be absorbed. Since the shaft 10 can be tilted in all horizontal directions, and the vibration absorbing spring 30 can absorb vibration external forces in all horizontal directions, vibration external forces in all directions can be absorbed.

  Since the attachment plate C is attached to the bottom surface of the power supply device, the attachment plate C cannot be inclined even if the shaft 10 is inclined. However, by providing play between the shaft 10 and the hole of the mounting plate C, the mounting plate C can be vibrated in the horizontal direction while being inclined with respect to the stepped portion 12 while being kept horizontal. At this time, the presser spring 53 acts to hold the mounting plate C against the stepped portion 12.

Further, when a vertical vibration external force is applied to the foundation base or the power supply device due to an earthquake or the like, the shaft 10 vibrates up and down with respect to the main body 20. When a downward vibration external force is applied to the shaft 10, the head 11 presses the lower spring 51, so an upward force acts on the shaft 10 due to the elasticity of the lower spring 51, and attempts to return to the original position. On the other hand, when an upward vibration external force is applied to the shaft 10, the head 11 presses the upper spring 52, so that a downward force acts on the shaft 10 due to the elasticity of the upper spring 52 and tries to return to the original position. That is, the vertical vibration can be absorbed by the lower spring 51 and the upper spring 52.
As described above, by providing the lower spring 51 and the upper spring 52 that absorb vibrations in the direction (vertical direction) perpendicular to the vibration absorption direction (horizontal direction) of the vibration absorbing spring 30, the ability to cope with earthquakes and the like can be increased. it can.

Hereinafter, another embodiment of the present invention will be described.
(First embodiment)
The first embodiment shown in FIG. 10 is a vibration isolator in which the above-described vibration isolator unit A is attached to a building D such as a house.
The main body 20 of the vibration isolator unit A is fixed to the base base B with anchor bolts 61. A mounting plate C having a U-shaped cross section is fixed to the shaft 10, and the mounting plate C is fixed to the joist of the building D with bolts and nuts 62. Therefore, the upper end of the shaft 10 is positioned in the space between the mounting plate C and the joist of the building D.
The vibration isolator unit A is attached to a plurality of locations on the bottom surface of the building D, for example.

  When a horizontal vibration external force is applied to the foundation base B or the building D due to an earthquake or the like, vibration can be absorbed by the vibration absorbing spring 30 of the vibration isolation unit A, and when a vertical vibration external force is applied, the vibration isolation device Vibration can be absorbed by the lower spring 51 and the upper spring 52 of the unit A.

(Second Embodiment)
The second embodiment shown in FIG. 11 is a vibration isolator in which the periphery of the main body 20 of the vibration isolator unit A is solidified with concrete and firmly fixed to the foundation base B in the first embodiment. Since the rest of the configuration is the same as in the first embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.
Since the main body 20 can be firmly fixed to the foundation base B, even if a strong vibration external force is applied due to an earthquake or the like, it can withstand the vibration external force.

(Third embodiment)
The third embodiment shown in FIG. 12 is characterized by a connecting portion between the shaft 10 of the vibration isolator unit A and the attachment member C.
The mounting member C has a space surrounded by a dome-shaped sliding surface 71, a bottom plate 72 having a hole in the center, and a cylindrical vibration absorbing spring holding portion 73 that connects the sliding surface 71 and the bottom plate 72. Have. The mounting member C is fixed to the joist of the building D with bolts and nuts 62.
The diameter of the hole in the bottom plate 72 is slightly larger than the diameter of the shaft 10 of the vibration isolator unit A, and the upper end of the shaft 10 can be inserted into the space of the mounting member C. A dome-shaped sliding member 15 is attached to the upper end of the shaft 10, and the weight of the building D is supported by the shaft 10 by the sliding member 15 coming into contact with the sliding surface 71. Since the sliding surface 71 and the sliding member 15 are curved, even if the sliding member 15 slides with respect to the sliding surface 71, it always comes into surface contact.

Further, in the space of the attachment member C, a spring guide 42 is inserted into the shaft 10, and a vibration absorbing spring 32 is inserted into the spring guide 42. The spring guide 42 has the same shape as the spring guide 40 inserted into the main body 20, and can hold a plurality of vibration absorbing springs 32 in a stacked state.
The vibration absorbing spring 32 has the same shape as that of the vibration absorbing spring 30 inserted into the main body 20, and has a size suitable for being inserted between the spring guide 42 and the vibration absorbing spring holding portion 73. The vibration absorbing spring 32 is held by the vibration absorbing spring holding portion 73 so as not to escape vertically.
Since the rest of the configuration is the same as in the second embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

  Due to such a configuration, when a horizontal vibration external force is applied to the foundation base B or the building D due to an earthquake or the like, vibration can be absorbed by the vibration absorbing spring 32 in addition to the vibration absorbing spring 30. Further, when a vertical vibration external force is applied, vibration can be absorbed by the lower spring 51 and the upper spring 52 of the vibration isolator unit A. Furthermore, since the shaft 10 and the mounting member C are always in surface contact, an excessive force does not act on the connecting portion, and damage can be prevented.

(Fourth embodiment)
13th Embodiment has the structure by which the recessed part was formed in the joist of the building D, and the attachment member C was fitted in the recessed part in 3rd Embodiment. Since the rest of the configuration is the same as that of the third embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.
The space between the bottom surface of the building D and the base base B can be reduced by the amount of the mounting member C fitted into the joist of the building D. Moreover, the same vibration isolation effect as the third embodiment can be obtained.

(Fifth embodiment)
The fifth embodiment shown in FIG. 14 is a seismic isolation structure for piping buried in the soil or the like.
In FIG. 14, 10 is a pipe which is an inner member, and 20 is a spring case which is a surrounding member. In the present embodiment, two vibration isolators E and E are combined and attached to a joint portion between two pipes 10 and 10 embedded in the soil G. The spring case 20 is formed with a holding portion 20a that can sandwich the flange 10a of the pipe 10, and further, a flange 20b that can couple the two spring cases 20 and 20 with bolts.
Therefore, the pipes 10 can be connected to each other by sandwiching the flanges 10a of the two pipes 10 and 10 between the holding portions 20a of the two spring cases 20 and 20 and connecting the flanges 20b with bolts.

The vibration absorbing spring 30 is externally inserted into the pipe 10 and is inserted into the spring case 20. It should be noted that the spring case 20 may be sealed with a suitable sealing material so as not to put earth or sand.
In the present embodiment, there is an advantage that vibration at the weakest joint of the pipe can be absorbed.

(Sixth embodiment)
The sixth embodiment shown in FIG. 15 is characterized by a structure in which the height of the vibration isolator unit A can be reduced.
The lower spring 51 in the vibration isolator unit A is sandwiched between spring seats 80 and 85 on the upper and lower sides thereof. The upper spring seat 80 includes a flange 81 and a bottom portion 82 having a shape recessed at the center thereof. The flange 81 is placed on the upper end surface of the lower spring 51, and the lower end portion of the shaft 10 is inserted into the spring seat 80 and supported by the bottom portion 82. Since the shaft 10 is lowered in this way, the installation is easy even when the distance between the foundation base B and the building D is small.

The lower spring seat 85 includes a flange portion 86 and a hemispherical portion 87 inside thereof. The collar portion 86 supports the lower spring 51 from below, and the hemispherical portion 87 is in contact with the upper surface of the bottom portion of the main body 20 so as to be swingable.
For this reason, in this embodiment, it is easy to absorb horizontal external forces, such as an earthquake, because the lower spring seat 85 swings.
Since the rest of the configuration is the same as that of the embodiment of FIG. 8, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

The mounting member C in FIG. 15 includes a support plate 75 having a sliding surface 71 whose inner surface is dome-shaped, and a mounting plate 76 that fixes the support plate 75. The mounting member C is fixed to the joist of the building D with bolts and nuts 62.
A dome-shaped sliding member 15 is formed on the upper end of the shaft 10 of the vibration isolator unit A, and the weight of the building D is supported by the shaft 10 by the sliding member 15 coming into contact with the sliding surface 71. It has become. Since the sliding surface 71 and the sliding member 15 are curved, even if the sliding member 15 slides with respect to the sliding surface 71, surface contact is always made.

  Due to the above configuration, when a horizontal vibration external force is applied to the foundation base B or the building D due to an earthquake or the like, vibration absorption by the vibration absorbing spring 30 is facilitated. Further, when a vertical vibration external force is applied, vibration can be absorbed by the lower spring 51 and the upper spring 52 of the vibration isolator unit A. Furthermore, since the shaft 10 and the mounting member C are always in surface contact and the spring seat 85 is swung in addition to this, an excessive force does not act on the connecting portion and it can be prevented from being damaged.

  INDUSTRIAL APPLICABILITY The present invention can be used for vibration resistance of buildings such as buildings and tanks, civil engineering machines, power supply devices, precision equipment, machine tools, railways, automobiles, and the like. In particular, when an earthquake or vibration occurs in an electric wire, a signal line, a gas pipe, a water pipe, a computer cable, a petroleum pipe, a tank, etc., it can be used for absorbing vibration energy including aerial installation and general installation as well as underground installation. Moreover, it can apply to the attachment part of a vibrating body and can absorb the vibration energy from a vibration source. Furthermore, the present invention can be applied to wheels and used for absorbing vibrations of wheels and traveling vehicles.

DESCRIPTION OF SYMBOLS 10 Inner member 20 Surrounding member 30 Damping spring 40 Spring guide 51 Lower spring 52 Upper spring A Vibration isolator unit B Foundation base C Mounting plate D Power supply device

  The present invention relates to a vibration isolator. More specifically, buildings, tanks and other buildings, power supplies, machinery, piping, and wiring are attached to foundations, soils, buildings, and other components to absorb earthquakes, mechanical vibrations, and other vibrations, and wheels. The present invention relates to a vibration isolator that absorbs vibration during traveling.

The following technique is used for the vibration proofing / vibration control method in the fields of buildings, buildings, machines, piping, and the like (Non-Patent Document 1).
1) To suppress the influence of vibration, such as a damper 2) To be elastically supported for vibration isolation, as a vibration isolator or vibration isolation mount 3) To reduce the response of the vibration body, eliminate rattling and loosening Fastening 4) As an automatic control method, a vibration input is detected and attenuated by reducing excitation force and response, or generating reverse force.

However, the conventional example has the following problems.
The conventional technique (1) uses a damper or the like, so that the apparatus is bulky and the application place is limited in terms of space.
In the prior art (2), for example, as shown in FIG. 15 , a rubber mount 103 is inserted between a foundation 101 and a mounting member 102 such as a building or a machine, and an anchor bolt 104 and a nut 105 are interposed between the two members. It was concluded with.
This rubber mount system can absorb vibrations with small vibrations, but cannot absorb large vibrations, so there is a limit to the vibration-proofing ability, and there is a problem that the rubber mount has a life span and the ability decreases with time.
In the prior art of (3), for example, as shown in FIG. 16 , an attachment member 102 placed on a foundation 101 is fixed by an uncassette 106, and a spring washer 107 is passed through a threaded portion of the uncassette 106 and a nut 108. It is configured to tighten with. When the uncassette 106 is fixed to the base 101, a pilot hole is made in the base 101. If the pilot hole can be manually or punched, it may not be straight due to the material variation of the base. In this case, since the uncassette 106 is attached with an inclination θ, a gap g is generated even if the nut 108 is tightened, and the uncassette 106 cannot be securely tightened and is easily loosened.
In addition, as shown in FIG. 17 , there is a method of attaching the piping 110 to the mount 112 attached to the wall surface of the building 111 with a band 113 or the like. Although it has anti-vibration effect, it cannot exert a great anti-vibration force, leading to a pipe rupture accident in the event of an earthquake or the like.
The conventional example of (4) requires a sensor as a vibration detector as a control element, an inertial mass for damping, an actuator as an operating force generator, a servo mechanism for control, a power source, etc. It becomes a large mechanism. For this reason, it can be used only when there is enough space and cost.
(5) Furthermore, none of the prior arts (1) to (4) described above has a compactness that can be incorporated into a wheel or the like and a degree of freedom of incorporation.

In order to solve these problems, the present inventor has devised a vibration isolator described in Patent Document 1.
As shown in FIG. 18 , the vibration isolator includes a shaft 114, a cylindrical case 115, and a vibration absorbing spring 116 that is externally inserted into the shaft 114 and inserted into the cylindrical case 115. The spring 116 is a winding spring having a non-circular shape such as a triangle or an ellipse.
When a vibration external force is applied to the shaft 114 or the cylindrical case 115, the vibration absorbing spring 116 is deformed, and vibration energy can be absorbed by generation of stress against the deformation. Since the vibration absorbing spring 116 bends and deforms in a sealed space surrounded by the shaft 114 and the cylindrical case 115, a large absorption energy is obtained and a vibration absorbing effect is high.
Therefore, it is compact and can be easily mounted, and can be applied in all technical fields such as buildings and wheels. In addition, the vibration isolator has a large vibration absorbing capacity for its size.

  However, there is a problem that a non-circular winding spring is difficult to manufacture compared to a general circular winding spring.

Japanese Patent No. 4366365

Mechanical Engineering Handbook Engineering Chapter C8 Environmental Equipment 207-208 Japan Society of Mechanical Engineers

  In view of the above circumstances, the present invention is easy to manufacture, is compact and can be easily mounted, can be applied in all technical fields such as buildings and wheels, and has a large vibration absorption capacity for its size. An object is to provide a vibration isolation device.

A vibration isolator according to a first aspect of the present invention includes a shaft attached to the vibration source side member or the vibration body side member, a cylindrical case attached to the vibration body side member or the vibration source side member, and a first that absorbs vibration in the radial direction of the shaft. A vibration-absorbing spring and a second vibration-absorbing spring that absorbs vibration in the axial direction of the shaft,
The first vibration absorbing spring is a non-circular annular member, is externally inserted into the shaft inserted concentrically into the cylindrical case, and is inserted into the cylindrical case. Are provided, and the cylindrical case is formed with a locking groove spaced in the circumferential direction, and the protruding portions of the plurality of first vibration absorbing springs are locked in the locking groove. The vibration absorbing spring is interposed between one end of the shaft and the bottom of the cylindrical case .
Vibration-isolating device of the second invention, in the first shot Akira, characterized in that it comprises a spring guide for holding so as to be perpendicular to the first vibration absorbing spring to the outer peripheral surface or inner peripheral surface of the cylindrical casing of the shaft And
Vibration-isolating device of the third invention, was first or the second aspect, the first vibration absorbing spring the plurality of are inserted at different angles in the circumferential direction for each first vibration absorbing spring, that Features.

According to the first invention, the following effects are obtained.
a) Since the vibration in the direction perpendicular to the axis can be absorbed by the first vibration absorbing spring and the vibration in the major axis direction of the shaft can be absorbed by the second vibration absorbing spring, the ability to cope with earthquakes and the like is enhanced.
b) Since the first vibration-absorbing spring is a non-circular annular member, it is only necessary to process the wire into an annular shape, which facilitates manufacture.
c) When an external vibration force is applied to the shaft or the cylindrical case , the first vibration absorbing spring is bent and deformed in a sealed space surrounded by the shaft and the cylindrical case , so that the absorbed energy is large and the vibration absorbing effect is high. In addition, since the first vibration absorbing spring is non-circular, it can absorb vibrations due to deformation regardless of the direction in which the external force acts, so that it can absorb vibrations in all directions.
d) By fitting the protruding portion of the first vibration absorbing spring into the groove formed in the cylindrical case, the position of the first vibration absorbing spring can be fixed so as not to rotate in the circumferential direction of the cylindrical case. Further, since it is only necessary to form a groove in the cylindrical case, the structure is simple and the manufacture is easy.
According to the second invention, it is possible to hold to be perpendicular to the first vibration absorbing spring against the inner circumferential surface of the outer peripheral surface or the cylinder casing of the shaft, the shaft due to vibration force is inclined with respect to the tubular casing However, since the first vibration absorbing spring does not slide obliquely with respect to the shaft or the cylinder case , the vibration external force works from the side of the first vibration absorbing spring and a sufficient restoring force is obtained. In addition, since the plurality of first vibration absorbing springs do not fall apart, a uniform restoring force can be obtained. Therefore, vibration can be reliably absorbed.
According to the third invention, since the plurality of first vibration absorbing springs are inserted at different angles in the circumferential direction, they contact the outer peripheral surface of the shaft and the inner peripheral surface of the cylindrical case at a plurality of locations in the circumferential direction. For this reason, the azimuth to be contacted increases, and the deformation of the first vibration absorbing spring is equalized regardless of the direction in which the vibration external force acts, and a high vibration absorbing ability can always be exhibited.

It is explanatory drawing of the basic composition of the 1st vibration absorption spring in this invention, Comprising : (A) is front view sectional drawing, (B) is a top view. An explanatory view of the vibration absorbing principle of the first vibration absorbing spring in the present invention, (A) a plan view of the first vibration absorbing spring of normal state, (B) is a plan view of the vibration isolation device when the vibration is applied an external force It is. An explanatory view of the vibration absorbing principle of the first vibration absorber spring according to other forms state of the present invention, (A) a plan view of the first vibration absorbing spring of normal state, (B) is when the vibration is applied an external force It is a top view of a vibration isolator. (I) is an explanatory view of a vibration isolator in which a plurality of first vibration absorbing springs are inserted in the same direction, and (II) is an explanatory diagram of the vibration isolator inserted by changing the angle for each of the plurality of first vibration absorbing springs . is there. (A) is explanatory drawing of the 1st damping spring which does not insert a spring guide, (B) is explanatory drawing of the 1st damping spring which inserted the spring guide. It is assembly explanatory drawing of the vibration isolator which concerns on 1st Embodiment of this invention. It is a cross- sectional view in the 1st vibration absorption spring part of the vibration isolator which concerns on 1st Embodiment of this invention. It is a longitudinal sectional view of the seismic isolation device shown in line VIII-VIII in FIG. It is explanatory drawing of the vibration absorption principle in the vibration isolator of 1st Embodiment . It is attachment state sectional drawing of the vibration isolator which concerns on 2nd Embodiment of this invention. It is an attachment state sectional view of the vibration isolator which concerns on 3rd Embodiment of this invention. It is attachment state sectional drawing of the vibration isolator which concerns on 4th Embodiment of this invention. It is attachment state sectional drawing of the vibration isolator which concerns on 5th Embodiment of this invention. It is an attachment state sectional view of the vibration isolator which concerns on 6th Embodiment of this invention. It is explanatory drawing of the conventional rubber mount type vibration proof structure. It is explanatory drawing of the conventional uncassette. It is explanatory drawing of the conventional piping attachment structure. It is explanatory drawing of the conventional vibration isolator, Comprising: (A) is front view sectional drawing, (B) is a top view.

Next, an embodiment of the present invention will be described with reference to the drawings.
(Basic configuration)
First, the basic configuration of the vibration isolator of the present invention will be described based on FIG.
Reference numeral 10 denotes a shaft, which is a member that extrapolates a first vibration absorbing spring 30 to be described later and transmits vibration external force to the first vibration absorbing spring 30 or receives vibration from the first vibration absorbing spring 30. The shaft 10 is a solid member or a hollow member. Examples of solid members include bolts and uncassettes. Examples of the hollow member include piping such as a gas pipe and wiring pipes. In short, the outer shape may be a circular member or a polygonal member similar to this, and members other than the above examples can be used as long as this requirement is satisfied.

Reference numeral 20 denotes a cylindrical case, which is a member that houses the first vibration absorbing spring 30 and transmits vibration external force to the first vibration absorbing spring 30 or receives vibration from the first vibration absorbing spring 30. As for this cylinder case 20, the inner peripheral surface should just be a cylindrical surface or the polygonal surface approximated to this, and an outer peripheral surface may be arbitrary shapes. Further, even if this cylindrical case 20 lacks a part in the circumferential direction, it does not completely surround the first vibration absorbing spring 30 as long as it is in contact with the first vibration absorbing spring 30 described later at several points. May be.

Reference numeral 30 denotes a first vibration absorbing spring . The first vibration absorbing spring 30 is externally inserted into the shaft 10 and is inserted into the cylindrical case 20. That is, it is inserted into a space surrounded by the shaft 10 and the cylindrical case 20, and is in contact with the inner wall surface and the outer wall surface. The first vibration absorbing spring 30 is a non-circular annular member, and is formed in a polygonal shape, an elliptical shape, or the like in plan view. In short, what is necessary is just to contact the outer peripheral surface of the shaft 10 and the inner peripheral surface of the cylindrical case 20 at two or more points.
A plurality of first vibration absorbing springs 30 are inserted, and the stress against the vibration external force can be changed by increasing or decreasing the number of the first vibration absorbing springs 30.

The first vibration absorbing spring 30 in the present embodiment is a triangular annular member. Triangular annular members are easy to manufacture because they can be obtained simply by bending them at two locations that divide the wire into three equal parts. Further, since the points in contact with the shaft 10 or the cylindrical case 20 are even at 120 ° intervals in the circumferential direction, vibrations in all directions can be absorbed in a balanced manner. Furthermore, since the space between the shaft 10 and the cylindrical case 20 can be made larger than in the case of using a more polygonal shape, vibration having a large amplitude can be absorbed.

As in the present embodiment, the triangular first vibration absorbing spring 30 obtained by bending the wire at two locations has a shape in which the apex at which both ends of the wire are combined protrudes outward compared to the apex formed by other bending It has become.
The cylindrical case 20 is formed with a rotation-preventing groove 21 in its axial direction . The anti-rotation groove 21 may penetrate the outer peripheral surface and the inner peripheral surface of the cylindrical case 20, or may be formed only on the inner peripheral surface.

The first vibration absorbing spring 30 is inserted so that the protruding portion 31 fits in the rotation preventing groove 21. The protrusion 31 of the first vibration absorbing spring 30 is one vertex when the first vibration absorbing spring 30 is polygonal. In short, it is a portion protruding outward in the first vibration absorbing spring 30 and a portion that can be fitted into the rotation prevention groove 21.
By fitting the protruding portion 31 of the first vibration absorbing spring 30 in detent groove 21, it is possible to fix the position so as not to rotate the first vibration absorbing spring 30 in the circumferential direction of the cylindrical case 20. Further, since it is only necessary to form a groove in the cylindrical case 20, the structure is simple and the manufacture is easy .

In the above-described vibration isolator, when the shaft 10 is attached to a vibration source side member (for example, a foundation, a machine that generates or transmits vibration, a building, or the like), the cylindrical case 20 has a vibrating body side member (for example, It can be attached to buildings and machinery on the foundation, piping attached to the building, etc.). Conversely, when the cylinder case 20 is attached to the vibration source side member, the shaft 10 is attached to the vibration body side.

(Vibration absorption principle of the first vibration absorbing spring 30 )
Next, the principle of vibration absorption of the first vibration absorbing spring 30 will be described.
In FIG. 2, it is assumed that a vibration external force Fa is applied to the shaft 10. The direction of the vibration external force Fa is directed to the straight portion of the triangular first vibration absorbing spring 30. Therefore, the axis | shaft 10 will push the linear part. Then, the straight line portion of the first vibration absorbing spring 30 is curved in an arc shape like a solid line from the normal state of the two-dot chain line (B). A reverse force acts on the shaft 10 by the restoring force of the first vibration absorbing spring 30 generated by this deformation, and the original position is restored.
At this time, depending on the damping coefficient determined by the first vibration absorbing spring 30 and other conditions, although the amplitude is attenuated, the shaft 10 moves to a position that has gone too far from the original position.

In this case, a vibration external force Fb in the opposite direction is applied to the shaft 10. The direction of the vibration external force Fb is directed to the apex of the triangular first vibration absorbing spring 30. Therefore, the shaft 10 pushes the two straight portions forming the apex. If it does so, the vertex of the 1st vibration-absorbing spring 30 will deform | transform so that an angle may spread from a normal state. A reverse force acts on the shaft 10 by the restoring force of the first vibration absorbing spring 30 generated by this deformation, and the original position is restored.
At this time as well, although the amplitude is attenuated depending on the attenuation coefficient, the axis 10 moves to a position that is too far from the original position.
By repeating the above movement, the amplitude is gradually attenuated and the vibration is absorbed.

When a vibration external force is applied from a direction other than Fa and Fb, the vibration is absorbed by the combined deformation of the two patterns. Therefore, on the plane including the first vibration absorbing spring 30, even if an external vibration force from any direction of 360 ° is applied, the first vibration absorbing spring 30 is deformed to absorb the vibration. That is, vibration can be absorbed in all directions.

As shown in FIG. 3, the first vibration absorbing spring 30 may have a shape in which three sides are curved inward in a normal state (A). Even in this case, even if the vibration external forces Fa and Fb and the vibration external force acting from other directions are applied based on the same principle as described above, the first vibration absorbing spring 30 can be deformed to absorb the vibration. .
In the case of this shape, since the three sides are curved inward, a larger restoring force can be generated with respect to the external force that curves the three sides outward. That is, greater vibration energy can be absorbed by the first vibration absorbing spring 30. Further, since the space between the shaft 10 and the cylindrical case 20 can be increased by the amount of the three sides bent inward, vibration having a large amplitude can be absorbed.

The above explanation of the principle is an example in which a vibration external force is applied to the shaft 10, but the same is true even when a vibration external force is applied to the cylindrical case 20, and an equivalent vibration absorbing ability can be exhibited.
In order to avoid resonance, it is preferable to remove the natural frequency of the first vibration absorbing spring 30 as much as possible from the frequency of the assumed vibration external force.

The above-described vibration absorbing effect is performed by the first vibration absorbing spring 30 being bent and deformed in close contact with the wall surface in a donut-shaped cylindrical space between the inner peripheral surface of the cylindrical case 20 and the outer peripheral surface of the shaft 10. However, since the bending deformation requires a larger force than the bending deformation, the absorbed energy can be increased for using a small member, and hence the vibration absorbing effect is enhanced.
In addition, since the required members are only three members of the shaft 10, the cylindrical case 20, and the first vibration absorbing spring 30, and the structure is simple, there is an advantage that it can be manufactured easily and inexpensively. Moreover, since it is very compact, it can be applied to a small portion of the mounting space and can be applied to many industrial fields.

Vibration-isolating device shown in FIG. 4 (i) is provided with a plurality of first vibration absorbing spring 30, is fitted projecting portions 31 of all of the first vibration absorbing spring 30 on one of the detent grooves 21 formed in the tubular casing 20 ing. Therefore, all the first vibration absorbing springs 30 are inserted in the same direction. That is, the positions at which all the first vibration absorbing springs 30 are in contact with the shaft 10 and the cylindrical case 20 are the same positions in plan view.

On the other hand, as shown in FIG. 4 (ii), if the two anti-rotation grooves 21 are formed in the cylindrical case 20 and the anti-rotation grooves 21 into which the protrusions 31 are fitted for the first vibration absorbing springs 30 are alternately arranged , The first vibration absorbing springs 30 at each stage are inserted at different angles in the circumferential direction. Then, for contacting with the circumferential direction of the plurality of locations with respect to the inner peripheral surface of the outer peripheral surface and the cylindrical case 20 of the shaft 10, the orientation of contact increases, also act from which orientation is vibrating external force, the first vibration absorbing The deformation of the spring 30 is equalized, and a high vibration absorption capability can always be exhibited.

As in the present embodiment, in the case of using the first vibration absorbing spring 30 of the triangle, by forming the two detent grooves 21 in a position rotated 60 °, the first vibration absorbing spring 30 of each stage positioned symmetrically Therefore, the position in contact with the shaft 10 and the cylindrical case 20 is well balanced, which is preferable.
In addition, it is good also as embodiment which forms more anti- rotation grooves 21 and changes the angle of the 1st damping spring 30 more finely.
Further, in each of the above drawings, the wire diameter of each spring material when using a plurality of anti-vibration springs 30 is basically the same size, but consideration must be given to avoid resonance due to earthquakes, mechanical vibrations, and other vibrations that are external forces. As a countermeasure in such a case, the wire diameter of the spring material may be appropriately changed for each spring according to the condition . Also, the first vibration absorbing spring in the present invention is for the said non-circular, is also included in the present invention various polygonal spring other than shown.

As shown in FIG. 5 (A), since the first vibration absorbing spring 30 is a planar member, is only inserted into the space surrounded by the shaft 10 and the cylindrical casing 20, the shaft 10 is tubular casing by vibrating the external force When tilted with respect to 20, it tilts with respect to the outer peripheral surface of the shaft 10 and the inner peripheral surface of the cylindrical case 20. When a plurality of first vibration absorbing springs 30 are inserted, each of them falls apart and tilts at different angles. Since the vibration external force does not act from the side to the inclined first vibration absorbing spring 30, a sufficient restoring force cannot be obtained. In addition, when the plurality of first vibration absorbing springs 30 are separated, an equal restoring force cannot be obtained. Therefore, the vibration external force cannot be sufficiently absorbed.

Therefore, as shown in FIG. 5B, the spring guide 40 is inserted into the shaft 10, and the first vibration absorbing spring 30 is inserted into the spring guide 40. Spring guide 40 is a cylindrical member, substantially equal the inner diameter to the outer diameter of the shaft 10 is a member that can be inserted so that there is no looseness with respect to the axis 10. Further, flange portions are formed at the upper end and the lower end, and the interval between the flange portions is substantially equal to the dimension obtained by multiplying the diameter of the wire rod of the first vibration absorbing spring 30 to be inserted by the number of the first vibration absorbing springs 30. The plurality of first vibration absorbing springs 30 can be held in a stacked state.
The first vibration absorbing spring 30 is held by the spring guide 40 so as to be perpendicular to the outer peripheral surface of the shaft 10. Therefore, even if the shaft 10 is tilted with respect to the cylindrical case 20 due to the vibration external force, the first vibration absorbing spring 30 does not slide obliquely with respect to the shaft 10, so the vibration external force works from the side of the first vibration absorbing spring 30, Sufficient resilience can be obtained. In addition, since the plurality of first vibration absorbing springs 30 do not fall apart, a uniform restoring force can be obtained. Therefore, vibration can be reliably absorbed.

Further, a spring guide may be provided on the cylindrical case 20 side and the first vibration absorbing spring 30 may be held so as to be perpendicular to the inner peripheral surface of the cylindrical case 20. In this case, even if the shaft 10 is inclined with respect to the cylindrical case 20 due to the vibration external force, the first vibration absorbing spring 30 does not slide obliquely with respect to the cylindrical case 20, and thus the same effect can be obtained.

In addition, you may provide a spring guide in both the axis | shaft 10 side and the cylinder case 20 side. The spring guide is not limited to the above-described shape, and any spring guide may be used as long as it holds the first vibration absorbing spring 30 so as to be perpendicular to the outer peripheral surface of the shaft 10 or the inner peripheral surface of the cylindrical case 20.

( First embodiment )
Next, a seismic Fuso location A of the first embodiment.
This embodiment is used for seismic isolation of a power supply device.

As shown in FIGS. 6, 7, 8, the second vibration absorbing spring 51 is inserted into a bottomed cylindrical tubular casing 20, the shaft 10 is inserted in coaxially thereon. Since the second vibration absorbing spring 51 needs to support the weight of the power supply device and absorb the vibration in the vertical direction, a strong spring is used. The illustrated second vibration absorbing spring 51 is a coil spring. The lower end of the shaft 10 in contact with the second vibration absorbing spring 51 is a dome-shaped head 11, the shaft 10 can be tilted with respect to the cylindrical case 20 around the head 11, and the head 11 is always It can come into contact with the second vibration absorbing spring 51. The shaft 10 can move up and down in the cylindrical case 20 .

An upper spring 52 is inserted into the shaft 10 and a spring guide 40 is inserted from above. Therefore, the upper spring 52 is sandwiched between the head 11 of the shaft 10 and the spring guide 40. Note that the upper spring 52 may not be inserted.

A plurality of first vibration absorbing springs 30 are inserted into the spring guide 40. Spring guide 40 is a cylindrical member, substantially equal the inner diameter to the outer diameter of the shaft 10 is a member that can be inserted so that there is no looseness with respect to the axis 10. The spring guide 40 is formed with a grease holding groove 41 capable of holding grease or the like on the inner peripheral surface so that the spring guide 40 can slide smoothly with respect to the shaft 10. Furthermore, the upper and lower ends and a flange portion is formed, the spacing of the flange portion is substantially equal to the dimension obtained by multiplying the spring number on the diameter of the wire of the first vibration absorbing spring 30 is inserted, a plurality of first vibration absorbing The spring 30 can be held in a stacked state.

The first vibration absorbing spring 30 of the present embodiment is a triangular annular member. Two anti-rotation grooves 21 are formed in the cylindrical case 20 in the axial direction, and the two anti-rotation grooves 21 are formed at positions rotated by 60 °. The plurality of first vibration absorbing springs 30 have their respective apexes 31 alternately fitted into the two anti-rotation grooves 21, and the first vibration absorbing springs 30 of each step are inserted at different angles in the circumferential direction.

The cylindrical case 20 is formed with a spring holding portion 22 having a large inner diameter, and the first vibration absorbing spring 30 is inserted into the spring holding portion 22. The vertical dimension of the spring holding portion 22 is substantially equal to the dimension obtained by multiplying the diameter of the wire rod of the first vibration absorbing spring 30 to be inserted by the number of springs, so that the first vibration absorbing spring 30 does not escape vertically. The anti-rotation groove 21 is formed at the same vertical position as the spring holding portion 22.

The upper end of the cylindrical case 20 lid 23 is bolted, and holding down the first vibration absorbing spring 30 enclosed in a cylindrical case 20, and the first vibration absorbing spring 30 does not escape upward.
The lid 23 is formed with a circular hole in the center of the upper surface, and the shaft 10 is passed through the hole. Diameter of the hole of the lid 23 is greater than the diameter of the shaft 10, the shaft 10 is adapted to be able to tilt with respect to the tubular casing 20.

Base Fuso location A is tubular case 20 is fixed to the underlying basis, mounting plate C the power supply side to the shaft 10 is fixed.
A portion of the shaft 10 protruding upward from the lid 23 is formed with a step portion 12 having a narrow diameter, and a mounting plate C having a hole having a diameter slightly larger than the diameter of the step portion 12 is formed from above the shaft 10. Has been inserted. Therefore, the mounting plate C is supported by the step portion 12 of the shaft 10.
A pressing spring 53 is inserted into the shaft 10 from above the mounting plate C, and a nut is screwed into a female screw formed at the upper end of the shaft 10 so that the mounting plate C is pressed by the pressing spring 53. A washer is inserted between the mounting plate C and the presser spring 53 and between the presser spring 53 and the nut. Also, a recess 13 into which a spanner or the like is inserted or a through hole 14 into which a rod can be inserted is machined into the shaft 10 so that the shaft 10 does not rotate when being fixed with a nut.
Power supply, for example, immune Fuso location A attached to its bottom four corners are supported by these.

Next, the vibration-absorbing principles of seismic Fuso location A of the first embodiment.
As shown in FIG. 9, when a horizontal vibration external force is applied to the foundation base or the power supply device due to an earthquake or the like, the shaft 10 swings with respect to the cylindrical case 20 around the head 11. Force acts from just beside the first vibration absorbing spring 30 by the swing, since the first vibration absorbing spring 30 is deformed, it is possible to absorb vibration. The shaft 10 can be tilted in all directions in the horizontal direction, and the first vibration absorbing spring 30 can absorb vibration external forces in all directions in the horizontal direction, so that vibration external forces in all directions can be absorbed.

Since the attachment plate C is attached to the bottom surface of the power supply device, the attachment plate C cannot be inclined even if the shaft 10 is inclined. However, by providing play between the shaft 10 and the hole of the mounting plate C, the mounting plate C can be vibrated in the horizontal direction while being inclined with respect to the stepped portion 12 while being kept horizontal. At this time, the presser spring 53 acts to hold the mounting plate C against the stepped portion 12.

Further, when a vertical vibration external force is applied to the foundation base or the power supply device due to an earthquake or the like, the shaft 10 vibrates up and down with respect to the cylindrical case 20 . When a downward vibration external force is applied to the shaft 10, the head 11 presses the second vibration absorbing spring 51, so that an upward force acts on the shaft 10 due to the elasticity of the second vibration absorbing spring 51 and tries to return to the original position. On the other hand, when the shaft 10 applied upward vibration force since the head 11 presses the upper spring 52, a downward force acts on the shaft 10 by the elasticity of the upper spring 52, it attempts to return to the original position. That is, the vibration in the vertical direction can be absorbed by the second vibration absorbing spring 51 and the upper spring 52.
Thus, by providing the second vibration absorbing spring 51 and the upper spring 52 that absorb vibrations in the direction (vertical direction) perpendicular to the vibration absorption direction (horizontal direction) of the first vibration absorbing spring 30, the ability to cope with earthquakes and the like is provided. Can be high.

( Second Embodiment)
The second embodiment shown in FIG. 10 is an example in which the immune Fuso location A described above buildings D such as a house.
Cylindrical case 20 of the seismic Fuso location A is fixed to the underlying basis B by anchor bolts 61. A mounting plate C having a U-shaped cross section is fixed to the shaft 10, and the mounting plate C is fixed to the joist of the building D with bolts and nuts 62. Therefore, the upper end of the shaft 10 is positioned in the space between the mounting plate C and the joist of the building D.
The immune Fuso location A, for example attached at a plurality of positions of the bottom surface of the building D.

An earthquake or the like, when applied horizontal vibration force underlying base B or buildings D, seismic Fuso can be vibration reducer by a first vibration absorbing spring 30 of the location A, also when applied in the vertical direction of the vibration force, seismic it can be vibration absorbing by the second vibration absorbing spring 51 and upper spring 52 of Fuso location a.

( Third embodiment)
Third embodiment shown in FIG. 11, in the second embodiment, the periphery of the immune Fuso location A of the cylindrical casing 20 encased in concrete, a vibration isolation device rigidly fixed to the foundation base B. Since the rest of the configuration is the same as in the second embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.
Since the cylindrical case 20 can be firmly fixed to the foundation base B, even if a strong vibration external force is applied due to an earthquake or the like, it can withstand the vibration external force.

( Fourth embodiment)
The fourth embodiment shown in FIG. 12 is characterized in the shaft 10 and the connecting portion between the mounting member C of immune Fuso location A.
The mounting member C has a space surrounded by a dome-shaped sliding surface 71, a bottom plate 72 having a hole in the center, and a cylindrical spring holding portion 73 that connects the sliding surface 71 and the bottom plate 72. Have. The mounting member C is fixed to the joist of the building D with bolts and nuts 62.
The diameter of the hole in the bottom plate 72 is slightly larger than the diameter of the shaft 10 of the vibration isolator unit A, and the upper end of the shaft 10 can be inserted into the space of the mounting member C. A dome-shaped sliding member 15 is attached to the upper end of the shaft 10, and the weight of the building D is supported by the shaft 10 by the sliding member 15 coming into contact with the sliding surface 71. Since the sliding surface 71 and the sliding member 15 are curved, even if the sliding member 15 slides with respect to the sliding surface 71, it always comes into surface contact.

Further, in the space of the attachment member C, a spring guide 42 is inserted into the shaft 10, and a vibration absorbing spring 32 is inserted into the spring guide 42. The spring guide 42 has the same shape as the spring guide 40 inserted into the cylindrical case 20 , and can hold the plurality of vibration absorbing springs 32 in a stacked state.
The vibration absorbing spring 32 has the same shape as the first vibration absorbing spring 30 inserted into the cylindrical case 20 and has a size suitable for being inserted between the spring guide 42 and the spring holding portion 73. . The vibration absorbing spring 32 is held by a spring holding portion 73 so as not to escape vertically.
Since the rest of the configuration is the same as that of the third embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

With such a configuration, when a horizontal vibration external force is applied to the foundation base B or the building D due to an earthquake or the like, vibration can be absorbed by the vibration absorbing spring 32 in addition to the first vibration absorbing spring 30. Further, when an external vibration force in the vertical direction is applied, vibration can be absorbed by the second vibration absorbing spring 51 and the upper spring 52 of the vibration isolator unit A. Furthermore, since the shaft 10 and the mounting member C are always in surface contact, an excessive force does not act on the connecting portion, and damage can be prevented.

( Fifth embodiment)
The fifth embodiment shown in FIG. 13 has a configuration in which a recess is formed in the joist of the building D and a mounting member C is fitted in the recess in the fourth embodiment. Since the other structure is the same as that of 4th Embodiment, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.
The space between the bottom surface of the building D and the base base B can be reduced by the amount of the mounting member C fitted into the joist of the building D. Moreover, the same vibration isolation effect as the fourth embodiment can be obtained .

( Sixth embodiment)
Sixth embodiment shown in FIG. 1 4 is characterized in a structure to be able to reduce the height of the immune Fuso location A.
Second vibration absorbing spring 51 in seismic Fuso location A is sandwiched by the spring seat 80, 85 at its top and bottom. The upper spring seat 80 includes a flange 81 and a bottom portion 82 having a shape recessed at the center thereof. The flange 81 is placed on the upper end surface of the second vibration absorbing spring 51, and the lower end portion of the shaft 10 is inserted into the spring seat 80 and supported by the bottom portion 82. Since the shaft 10 is lowered in this way, the installation is easy even when the distance between the foundation base B and the building D is small.

The lower spring seat 85 includes a flange portion 86 and a hemispherical portion 87 inside thereof. The collar portion 86 supports the second vibration absorbing spring 51 from below, and the hemispherical portion 87 is in contact with the upper surface of the bottom portion of the cylindrical case 20 so as to be swingable.
For this reason, in this embodiment, it is easy to absorb horizontal external forces, such as an earthquake, because the lower spring seat 85 swings.

Mounting member C in FIG. 1. 4, consists of mounting plate 76 whose inner surface is fixed to the support plate 75 having a sliding surface 71 of the dome-shaped, the support plate 75. The mounting member C is fixed to the joist of the building D with bolts and nuts 62.
The upper end of the shaft 10 of the seismic Fuso location A are formed sliding member 15 of the dome-shaped by the sliding member 15 on the sliding surface 71 comes into contact, to support the weight of the building D in shaft 10 It has become. Since the sliding surface 71 and the sliding member 15 are curved, even if the sliding member 15 slides with respect to the sliding surface 71, surface contact is always made.
Since the rest of the configuration is the same as that of the first embodiment of FIG. 8, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

Due to the above configuration, when a horizontal vibration external force is applied to the foundation base B or the building D due to an earthquake or the like, vibration absorption by the first vibration absorbing spring 30 becomes easy. Also, when applied in the vertical direction of the vibration force can be vibration absorbing by the second vibration absorbing spring 51 and upper spring 52 of immune Fuso location A. Furthermore, since the shaft 10 and the mounting member C are always in surface contact and the spring seat 85 is swung in addition to this, an excessive force does not act on the connecting portion and it can be prevented from being damaged.

INDUSTRIAL APPLICABILITY The present invention can be used for vibration resistance of buildings such as buildings and tanks, civil engineering machines, power supply devices, precision equipment, machine tools, railways, automobiles, and the like. In particular, when an earthquake or vibration occurs in an electric wire, a signal line, a gas pipe, a water pipe, a computer cable, a petroleum pipe, a tank, etc., it can be used for absorbing vibration energy including aerial installation and general installation as well as underground installation. Moreover, it can apply to the attachment part of a vibrating body and can absorb the vibration energy from a vibration source .

10 shaft 20 cylinder case 30 first vibration absorbing spring 40 spring guide 51 second vibration absorbing spring 52 upper spring A vibration isolator unit B base base C mounting plate D power supply

According to a first aspect of the present invention, there is provided a vibration isolator comprising: a shaft attached to the vibration source side member or the vibration body side member; a cylindrical case attached to the vibration body side member or the vibration source side member; A vibration-absorbing spring and a second vibration-absorbing spring that absorbs vibration in the axial direction of the shaft,
The first vibration absorbing spring is a non-circular annular member, is externally inserted into the shaft inserted concentrically into the cylindrical case, and is inserted into the cylindrical case. is provided with a plurality, the cylindrical casing forms a locking groove spaced intervals in the circumferential direction, the protruding portion of the plurality of first vibration absorbing spring, is locked in the locking groove, the first The two vibration absorbing springs are interposed between one end of the shaft and the bottom of the cylindrical case.
According to a second aspect of the present invention, the vibration isolator includes a spring guide that holds the first vibration-absorbing spring so as to be perpendicular to the outer peripheral surface of the shaft or the inner peripheral surface of the cylindrical case. To do.
Vibration-isolating device of the third invention, in the first or second invention, the first vibration absorbing spring the plurality of is characterized in that it is inserted by changing the angle in the circumferential direction for each first vibration absorbing spring .

Claims (5)

An inner member attached to the vibration source side member or the vibration body side member;
An enclosure member attached to the vibration member side member or the vibration source side member;
A vibration-absorbing spring that is externally inserted into the inner member and inserted into the surrounding member,
The vibration isolator is a non-circular annular member. A groove is formed in the surrounding member,
2. The vibration isolator according to claim 1, wherein a projecting portion of the vibration absorbing spring is fitted into the groove. A plurality of vibration absorbing springs,
The vibration isolator according to claim 1 or 2, wherein the plurality of vibration absorbing springs are inserted at different angles in the circumferential direction for each of the vibration absorbing springs. 4. The vibration isolator according to claim 1, further comprising a spring guide that holds the vibration absorbing spring so as to be perpendicular to an outer peripheral surface of the inner member or an inner peripheral surface of the surrounding member. 5. The vibration isolator according to claim 1, further comprising a spring that absorbs vibration in a direction orthogonal to a vibration absorption direction of the vibration absorption spring between the inner member and the surrounding member.