JP3100886B2 - Dynamic vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a structure, which can cope with two-dimensional vibration using one movable weight, and can obtain a vibration damping effect regardless of the direction. It relates to a vibration damping device.

[0002]

2. Description of the Related Art A conventional dynamic vibration absorber is configured to specify a vibration direction of a structure to be damped and to vibrate an additional weight so as to exert a vibration damping effect in that direction. When there are a plurality of vibration directions to be vibrated, it is necessary to install the dynamic vibration absorbers in a number corresponding to each direction. FIG. 9 schematically shows a conventional method of installing a dynamic vibration absorber.
A plurality of dynamic vibration absorbers, each of which supports an additional weight 2 by a rigid element 3 and a damping element 4, are provided corresponding to the vibration direction of the structure 1 to be damped. If the installation space for the dynamic vibration absorber can be sufficiently secured, as in a large structure such as a building structure,
There was no problem in installing multiple units.

[0003]

In the above-mentioned conventional dynamic vibration absorber, when the installation space for the dynamic vibration absorber is limited, for example, as in the case of an illumination lamp, and vibration control in a plurality of directions is required,
With the conventional structure in which the vibration direction of the added weight is constant, the mechanism is complicated and there is a limit in miniaturization, and it is difficult to perform appropriate setting for obtaining a vibration suppression effect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dynamic vibration damping device capable of reducing vibration in two-dimensional directions with a small, lightweight, and simple configuration. It is in.

[0005]

In order to achieve the above object, in a dynamic vibration damping device according to the present invention, a movable weight portion and a movable portion yoke are provided on the movable weight portion. A movable part magnet row in which adjacent cylindrical magnets are arranged via concentrically arranged magnets having magnets of different magnetic poles alternately,
A fixed portion provided opposite to the movable weight portion, and a fixed portion in which magnets of different magnetic poles are respectively arranged via a fixed portion yoke at a position facing the cylindrical magnet on the movable weight portion side in a stationary state on the fixed portion side. A plurality of movable section bearing support members fixed between the concentrically arranged magnets of the movable section yoke, a movable section bearing support seat provided on the movable section bearing support member, and a fixed section. A plurality of fixed part bearing support members fixed between the magnets forming the fixed part magnet row of the fixed yoke, a fixed part bearing seat provided on the fixed part bearing support member, and a movable part bearing seat A rigid sphere that is sandwiched between the bearings of the bearings and enables the relative movement of the movable part and the fixed part, and a conductor plate that is inserted in the gap between the movable part magnet and the fixed part magnet and is perforated so that the rigid sphere can move relative to each other Have.

A dynamic vibration damping device according to a second aspect of the present invention is the dynamic vibration damping device according to the first aspect, wherein a movable portion conductor plate integrally provided with a movable portion bearing seat and a plurality of movable portion bearings are provided. a movable portion conductor plate support member fixedly mounted movable portion conductor plate to the movable yoke in place of the support member, a fixing portion conductor plate which is provided integrally with the fixed portion bearing receiving seat instead of the conductive plate, a plurality of fixed A fixed part conductor plate supporting member for fixing the fixed part conductor plate to the fixed part yoke instead of the part bearing supporting member is provided.

According to a third aspect of the present invention, there is provided a dynamic vibration absorbing type vibration damping device according to the first or second aspect, wherein the outside of the fixed portion outermost peripheral magnet facing the outermost peripheral magnet of the movable portion magnet row. And an external fixed portion magnet having the same magnetic pole as the outermost magnet of the movable portion.

According to a fourth aspect of the present invention, there is provided a dynamic vibration damping device according to the first aspect, wherein a bearing seat and a rigid ball are interposed between the movable portion magnet row and the fixed portion magnet row. At least one intermediate magnet is provided on the upper and lower sides of the yoke with the magnets of different magnetic poles facing the movable magnet row and the fixed magnet row.

[0009]

[0010]

In the above-structured dynamic vibration damping device,
According to the first and second aspects of the present invention, when the movable weight portion moves from the rest position, that is, when the facing magnet is shifted in the horizontal direction, the attracting force is applied between the different magnetic poles facing each other at the rest position. While a force acts, a repulsive force acts by approaching the same adjacent magnetic pole. Each of these acts as a restoring force for returning the moving amount of the movable weight to the two-dimensional movement in an arbitrary direction. Further, the magnetic flux passing through the conductor plate moves relative to the conductor plate as the movable weight moves, and these act as magnetic damping force due to eddy current loss generated in the conductor plate.

The spring constant and the damping coefficient of the magnetic spring and the damper element are adjusted according to the vibration characteristics of the structure to be damped.
After adjusting based on the known dynamic vibration absorber theory, a dynamic vibration damping device that supports a movable weight by a magnetic spring and a damper element at a position where the amplitude becomes largest when the structure to be damped vibrates. When an external force such as an earthquake acts on the structure to be damped due to the installation of the, the movable weight vibrates, thereby greatly reducing the vibration of the structure to be damped.

Further, the gap between the opposed magnets is kept constant,
By installing a bearing structure between the opposed magnets to smoothly move the movable weight part in the two-dimensional direction, the external dimensions of the dynamic vibration absorber and movable part are the same as the magnet dimensions required to obtain the magnetic spring characteristics. And the entire device can be downsized.

According to the third aspect of the present invention, in the magnetic spring / damper element, the multiplex structure of the fixed part magnets with respect to the movable part side magnets is increased, and the installation range of the fixed part magnets in the radial direction is increased, so that the movable part is particularly movable. When the displacement of the heavy part becomes large, the outermost magnets of the movable part have the same magnetic pole and exert a repulsive force.
The linearity of the magnetic spring characteristics can be maintained.

[0015] In the fourth aspect of the invention, the first aspect is provided.
In the magnetic spring / damper element described above, the intermediate magnet is added at least one stage via a bearing structure to form a multi-layer structure magnet so that the dynamic vibration absorber and the external dimensions are not changed.
Since the movable range (stroke) of the movable portion can be widened, it is possible to cope with a case where large-amplitude vibration suppression is required.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (first embodiment) according to claim 1 of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view when a dynamic vibration absorber using a magnetic spring and a damper element according to the present invention is applied to an illumination lamp as a structure to be damped, and FIG. 2 is a sectional view taken along line AA in FIG. FIG.

In the first embodiment, a multi-structure magnet in which the movable portion inner magnet 6 and the movable portion outer magnet 7 adjacent to the movable weight 5 of the dynamic vibration damping device have different magnetic poles is used. It is fixed via a yoke 8 made of a material. Here, the movable portion inner magnet 6, the movable portion outer magnet 7, the yoke 8
Are collectively referred to as movable section magnets 9. At a position opposed thereto, a multi-structure magnet having a different magnetic pole opposed to the movable portion magnet 9 is provided via the yoke 8 in a stationary state. That is, the mounting base 1 is used as a fixed part.
When the movable portion inner magnet 6 has an N pole, the fixed portion inner magnet 10 has an S pole, the movable portion outer magnet 7 has an S pole, and the fixed portion outer magnet 11 has an N pole.

Here, a set of the fixed portion inner magnet 10, the fixed portion outer magnet 11, and the yoke 8 is collectively referred to as a fixed portion magnet 12. The movable part magnet 9 and the fixed part magnet 12 are installed with a certain gap 13 up and down, and this is because the movable weight 5 and the bearing receiving seat 14 fixed to the damping target structure 1 respectively.
Are secured by directly sandwiching a plurality of hard spheres 15 through the sphere.

Further, a conductor plate 16 is provided in the gap 13 so as not to be in contact with the magnet. The conductor plate 16 may be fixed to any one of the illumination lamp pole 19 side and the movable weight 5 side which are the structures to be damped, but in this embodiment, the illumination lamp which is the fixed portion side via the conductor plate support ring 17. Installed on pole 19.

Although a double cylindrical magnet is shown here as the multi-structured magnet, the magnets may be arranged in a plurality of cylindrical shapes. The dynamic vibration damping device using the magnetic spring and the damper element having such a configuration is mounted on the top of an illumination lamp pole 19 via an installation base 18. It is stored in an integrated storage box 21. Further, in this embodiment, the mounting base 18 is provided as a fixing portion. However, this is easy to fix when the mounting base 18 is long like the illumination lamp pole 19 and its diameter is smaller than that of the main vibration absorbing type vibration damping device. This is exemplified as a shape. The fixing portion may be any one that can be fixed to the structure to be damped. Therefore, in the case of a structure to be damped having a shape different from that of the illumination pole 19, a shape more suitable for fixing may be used.

According to such a configuration, when the movable weight 5 moves from the stationary position, attraction between the different magnetic poles opposed at the stationary position, for example, between the movable inner magnet 6 and the fixed inner magnet 10, Power works. On the other hand, the fixed portion outer magnet 1 is located adjacent to the same magnetic pole, for example, the N pole of the movable portion inner magnet 6.
A repulsive force is exerted by the approach of the 1 N pole. Although it is clear from FIG. 2 that the movement from the rest position is possible in any two-dimensional direction, the restoring force acts on the movement in any direction.

Accordingly, the dynamic vibration absorbing type vibration damping device according to the present embodiment can greatly reduce the vibration of the lighting fixture 20 by vibrating the movable weight 5 when an external force such as an earthquake acts.

Next, an embodiment (second embodiment) according to claims 2 and 3 of the present invention will be described with reference to FIGS. 3 and 4, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description of the components is omitted. In the present embodiment, a bearing seat 14 is disposed in a gap 13 between the opposing movable part magnet 9 and fixed
5 is sandwiched. Here, the bearing receiving seat 14 is fixed to the yoke 8 via the bearing support ring 22 on both the movable portion side and the fixed portion side. In the present embodiment, the conductor plate support ring 17 and the lower yoke 8 also serve as the fixing portion.

In the thus configured dynamic vibration absorbing type vibration damping device of this embodiment, the bearing receiving seat 14 sandwiching the rigid ball 15 is disposed in the gap 13 so that the movable magnet 9 and the fixed magnet 12 opposed to each other are arranged. Since the device is installed between the magnets, the size of the device can be reduced to the same size as the external size of the facing magnet.

FIG. 5 shows an embodiment (third embodiment) according to claim 4 of the present invention.
Moving part conductor plate 23 and fixed part conductor plate 2 embedded with
4 are fixed to the yoke 8 via the conductor plate support ring 17, respectively, are set in gaps 13 between the opposing movable part magnet 9 and the fixed part magnet 12, and sandwich the hard sphere 15. In this embodiment, the lower yoke 8 is used as the fixing portion.
Has the same structure.

In the thus configured dynamic vibration absorbing type vibration damping device, as in the second embodiment, the size of the device can be reduced to the same size as the external dimensions of the facing magnet.
FIG. 6 shows an embodiment (fourth embodiment) according to claim 5 of the present invention. In the fixed part magnet 12, in addition to a part symmetrical to the movable part magnet 9, a yoke 8 is provided outside the part.
The outermost peripheral magnet 25 is arranged via the. The outermost peripheral magnet 25 has a different magnetic pole from the fixed portion outer magnet 11, and has the same magnetic pole as the movable portion outer magnet 7.

In the present embodiment thus configured, even when the displacement of the movable part magnet 9 is large, the outermost peripheral magnet 25 is added to the fixed part magnet 12 so that the movable part having the same magnetic pole as the outermost peripheral magnet 25 is provided. Since the outer magnet 7 repels, it is possible to prevent the restoring force from lowering.

FIG. 7 shows an embodiment (fifth embodiment) according to claim 6 of the present invention, in which a movable magnet 9 having the same shape as the movable magnet 9 and the fixed magnet 12 is provided. A movable intermediate magnet 29 in which an inner magnet 26 and a movable outer magnet 27 are arranged above and below a yoke 28 is provided to form a multilayer structure of magnets. The intermediate magnet 29 is vertically mounted on the bearing seat 1
4 is fixed, and the rigid ball 15 is fixed.
Between the movable part magnet 9 and the fixed part magnet 12
A gap 31 and a gap 32 are secured between them.

The magnet disposed above the yoke 28 among the intermediate magnets 29 includes the movable part magnet 9 and the one yoke 2
The magnets disposed below 8 are provided to face the fixed portion magnets 12 with different magnetic poles. In FIG. 7, the movable portion inner magnet 6 has an N pole, and the upper movable inner magnet 26 opposed thereto has an S pole. The movable outer magnet 7 has an S pole, and the upper movable outer magnet 27 has an N pole opposed thereto.

In the present embodiment having the above-described structure, the movable range of the dynamic vibration damping device can be expanded due to the multilayer structure of the magnets, so that a large amplitude vibration can be suppressed.

FIG. 8 shows a sixth embodiment according to the second to sixth embodiments of the present invention. In the present embodiment, the dynamic vibration damping device is installed near the top of a long columnar structure such as a lighting lamp or a road sign lamp. In FIG. 7, the dynamic vibration damping device according to the second embodiment of the present invention shown in FIG. 3 is installed on the top of an illumination pole 19 via an installation cart 18. Needless to say, a dynamic vibration damping device shown as an embodiment other than the dynamic vibration damping device shown in the second embodiment may be installed.

[0032]

As described above, in the dynamic vibration-damping type vibration damping device of the present invention, the movable weight is supported by the magnetic restoring force in any two-dimensional direction, and the movable weight is related to the direction by one movable weight. And a damping effect can be obtained. In addition, by disposing a conductor plate between the opposing magnets, it can also be used as a magnetic damper, and all of the spring element and the damping element can be stored under the movable weight, so that the dynamic vibration damping device can be significantly reduced in size. Further, by disposing the bearing portion between the opposed magnets or by using a dynamic damping type vibration damping device having a multiplex structure, the moving range of the movable portion can be secured and further downsizing in the radial direction can be achieved. Therefore, even for a vibration damping target structure that requires a large stroke for the movable part with a low frequency and requires a small size, the vibration can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a dynamic vibration damping device according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the dynamic vibration damping device according to the present invention.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a longitudinal sectional view showing a third embodiment of the dynamic vibration damping device according to the present invention.

FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the dynamic vibration damping device according to the present invention.

FIG. 7 is a longitudinal sectional view showing a fifth embodiment of the dynamic vibration damping device according to the present invention.

FIG. 8 is a longitudinal sectional view showing a sixth embodiment of the dynamic vibration damping device according to the present invention.

FIG. 9 is a configuration diagram showing a conventional example of a dynamic vibration damping device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vibration suppression target structure 2 ... Additional weight 3 ... Rigid element 4 ... Damping element 5 ... Movable weight 6 ... Movable part inner magnet 7 ... Movable part outer magnet 8 ... Yoke 9 ... Movable part magnet 10 ... Fixed part inner magnet 11 ... fixed part outer magnet 12 ... fixed part magnet 13 ... gap 14 ... bearing seat 15 ... rigid ball 16 ... conductor plate 17 ... conductor plate support ring 18 ... mounting base 19 ... lighting pole 20 ... lighting equipment 21 ... storage box 22 ... Bearing support ring 23 ... Movable part conductor plate 24 ... Fixed part conductor plate 25 ... Outermost magnet 26 ... Inner magnet 27 ... Outer magnet 28 ... Yoke 29 ... Middle part magnet 30 ... Middle part conductor plate 31 ... Gap 32 ... Gap

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-109935 (JP, A) JP-A-62-2030 (JP, A) JP-A-5-296286 (JP, A) 123785 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 15/02-15/08

Claims (4)

(57) [Claims] 1. A movable weight portion, and a movable portion magnet row in which adjacent cylindrical magnets installed on the movable weight portion via a movable portion yoke and having magnets of different magnetic poles alternately and concentrically arranged,
A fixed portion provided opposite to the movable weight portion, and magnets having different magnetic poles are respectively disposed via a fixed portion yoke at positions opposed to the cylindrical magnet on the movable weight portion side in a stationary state on the fixed portion side. A fixed part magnet row, a plurality of movable part bearing support members fixed between the concentrically arranged magnets of the movable part yoke, and a movable part bearing seat provided on the movable part bearing support member A plurality of fixed part bearing support members fixed between the magnets constituting the fixed part magnet row of the fixed part yoke; a fixed part bearing receiving seat provided on the fixed part bearing support member; A rigid sphere, which is sandwiched between the part bearing seat and the fixed part bearing seat and enables relative movement of the movable part and the fixed part, and the rigid sphere inserted into the gap between the movable part magnet and the fixed part magnet, Dynamic vibration damping device, characterized in that it comprises a rotatably to perforated conductive plate. 2. The dynamic vibration absorbing type vibration damping device according to claim 1, wherein said movable part conductor plate is provided integrally with said movable part bearing seat, and said movable part conductor is substituted for said plurality of movable part bearing support members. A fixed part conductor plate provided with a movable part conductor plate support member for fixing a plate to the movable part yoke, wherein the fixed part bearing seat is integrally provided instead of the conductor plate; and the plurality of fixed part bearing support members. A fixed-part conductor plate supporting member for fixing the fixed-part conductor plate to the fixed-part yoke instead of the fixed-part conductor plate. 3. An external fixed part magnet having the same magnetic pole as the movable part outermost peripheral magnet is provided outside the fixed part outermost peripheral magnet opposed to the outermost peripheral magnet of the movable part magnet row. 3. The dynamic vibration damping device according to 1 or 2. 4. A movable bearing magnet row and a fixed section magnet row are provided between the movable section magnet row and the fixed section magnet row via a bearing seat and a hard sphere, and are provided above and below a yoke, respectively. 2. The dynamic vibration damping device according to claim 1, wherein at least one intermediate magnet in which magnets of different magnetic poles are arranged facing each other is provided.