JP3727101B2 - Magnetic friction damping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping device interposed between two members in order to suppress vibration between two members, and relates to a magnetic friction type vibration damping device that performs a vibration suppressing action by a magnetic friction force. It is.
[0002]
[Prior art]
Conventionally, various types of vibration control devices have been proposed, such as a hydraulic device or a mechanical device, but a device using magnetic friction cannot be found.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention is a compact vibration damping device using magnetic friction, which can relatively easily change the braking force according to the amount of displacement caused by vibration as desired. The object is to provide a vibration device.
[0004]
[Means for Solving the Problems]
In the present invention, in order to solve the above problem, in the vibration damping device interposed between the first and second members A and B that vibrate in a relatively linear direction to suppress the relative vibration, One of the first and second support members 2, 12, 3, and 13 is coupled to the first member A and the other is coupled to the second member B, and both can be displaced relative to each other with vibration. The holding portions 2b and 15 for engaging and holding the magnetic friction members 7 and 17 are provided on one of the first or second support members 2, 12, 3 and 13, and the holding portions 2b and 15 The magnetic friction type vibration damping devices 1 and 11 are configured by holding the magnetic friction members 7 and 17 movably so as to be attracted to the magnetic adsorption plates 4 and 14 of the support members 3 and 12. Further, the magnetic adsorption plates 4, 14 of the support members 3, 12 are provided with a ferromagnetic portion and a weak magnetic portion, and the magnetic friction member 7 is associated with the relative displacement between the magnetic friction members 7, 17 and the magnetic adsorption plates 4, 14. , 17 on the magnetic attraction surface, that is, the vibration suppressing force is changed.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 is a front view of the vibration damping device, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3 is an exploded perspective view of the vibration damping device, FIG. 4 is a cross-sectional view of the vibration damping device of another embodiment, and FIG. 4 is a cross-sectional view taken along line VV in FIG. 4, and FIG. 6 is an exploded perspective view of the holding portion and the magnetic friction member.
[0006]
The vibration damping device 1 according to the present invention includes, for example, a straight line between a structure such as a building and a device installed therein, and between the first and second members A and B that vibrate relatively. It is provided to suppress relative vibration in the direction.
[0007]
The vibration damping device 1 is of a magnetic friction type, and includes a lower case 2 that is a first support member and an upper insert 3 that is a second support member. 2a is freely coupled to the first member A, and a puller 3a at the upper end of the insert 3 is freely coupled to the second member B.
[0008]
The case 2 has a flat box shape and is open upward. A lower part of the plate-like insert 3 is inserted into the case 2 so as to freely enter and exit in the vertical direction. The case 2 includes an opening 2b as a holding portion for holding the magnetic friction member 7. That is, the case 2 has three rectangular openings 2b formed on opposite side walls so as to face each other, and has a long hole 2c extending in the vertical direction below each opening 2b. The opening 2b and the long hole 2c may be singular or plural. In the illustrated embodiment, the openings 2b are arranged at equal intervals in the horizontal direction, and the long holes 2c extend vertically along the vertical center line of the opening 2b.
[0009]
The insert 3 is formed by attaching magnetic adsorption plates 4 to both surfaces of a substantially rectangular substrate 3b made of a ferromagnetic material. A magnetic adsorption surface is formed on the surface of the magnetic adsorption plate 4. The magnetic attraction plates 4 are each substantially rectangular, and are attached so as to extend in the vertical direction along with the horizontal direction so as to correspond to the opening 2 b of the case 2. The magnetic attraction plate 4 is formed by fixing two ferromagnetic plates 4b and 4b separated vertically on the back surface of a rectangular thin plate 4a made of a ferromagnetic material. A space is provided between the upper and lower ferromagnetic plates 4b and 4b, and the upper and lower ferromagnetic plates 4b and 4b are notched obliquely so that the surface area thereof decreases downward or upward. Accordingly, a ferromagnetic portion overlapping the ferromagnetic plate 4b and a weak magnetic portion deviating from the ferromagnetic plate 4b are formed on the magnetic adsorption surface formed on the insert 3. The distribution changes in the vertical direction according to the shape of the ferromagnetic plate 4b. The magnetic attraction plate 4 is rotatably supported by the substrate 3b with a pin 5 at the center, and is fixed at an appropriate rotational angle position by a bolt 6 screwed into the substrate 3b through upper and lower arc-shaped holes 4c. The head of the bolt 6 can move up and down in the long hole 2 c of the case 2.
[0010]
A magnetic friction member 7 that is attracted to the magnetic attracting surface of the insert 3 is fitted in the opening 2b of the case 2 so as to be movable in a direction perpendicular to the side wall. The magnetic friction member 7 is formed by alternately superposing rectangular magnetic plates 7a and magnet plates 7b. The magnetic plate 7 a is slightly larger than the magnet plate 7 b, and the edge protrudes from the end of the magnet plate 7 b so that the magnet plate 7 b does not directly contact the magnetic attracting surface of the insert 3.
[0011]
Therefore, when vibrations occur in the directions approaching and separating from each other between the first member A and the second member B, the insert 3 moves up and down relatively with respect to the case 2, but magnetic friction Since the member 7 is attracted to the magnetic attracting surface of the insert 3, frictional resistance is generated between them, and vibration energy is converted into heat and attenuated. Since the area of the ferromagnetic plate 4b changes in the vertical direction, the attractive force of the magnetic friction member 7 with respect to the magnetic attractive surface of the insert 3 changes due to the relative displacement in the vertical direction. This rate of change can be changed by changing the fixed angle of the magnetic attraction plate 4 with respect to the substrate 3b. This rate of change is set as appropriate depending on the nature of the vibration control target. Furthermore, if the shape of the tapered portion of the ferromagnetic plate 4b is changed, a desired change rate can be set.
[0012]
In another embodiment of the present invention shown in FIG. 5, a case 12 as a first support member is formed of a cylindrical body opened on one end side, and has a handle 12 a on the other end side closed. A magnetic adsorption plate 14 that provides a magnetic adsorption surface is fixed to the inner periphery of the case 12. As in the previous embodiment, the magnetic adsorption plate 14 can form a relatively strong portion and a weak portion.
[0013]
One end side of the rod-shaped insert 13 serving as the second support member is inserted into the case 12 through the open portion so as to be freely accessible in the axial direction. The insert 13 is provided in the case 12 and has a holding portion 15 for holding the magnetic friction member 17.
[0014]
The magnetic friction member 17 is held by the holding portion 15 so as to be movable in the radial direction so that it can be attracted to the magnetic attracting surface on the inner periphery of the case 12. The holding portion 15 is configured by connecting two ring-shaped cage bodies 16 of the same shape in the axial direction with bolts 16 c and fixing them to the insertion body 13. The cage body 16 has three fan-shaped holding spaces 16b that extend outward at equal angles with a space between the partitions 16a in the circumferential direction. The magnetic friction member 17 has a fan-shaped planar shape that fits into the holding space 15b. The magnetic friction member 17 is formed by alternately superposing and fixing fan-shaped magnetic plates 17a and magnet plates 17b. The magnetic plate 17 a is slightly larger than the magnet plate 17 b, and the edge protrudes from the end of the magnet plate 17 b so that the magnet plate 17 b does not directly contact the magnetic attraction surface of the case 2.
[0015]
In the vibration damping device 11 of this embodiment, when vibrations in directions approaching and separating from each other occur between the first member A and the second member B, the insert 13 is axial with respect to the case 12. Although the magnetic friction member 17 is adsorbed to the magnetic adsorption plate 14 on the inner periphery of the case 12, frictional resistance is generated between them, and vibration energy is converted into heat and attenuated. become.
[0016]
【The invention's effect】
As described above, in the present invention, in the vibration damping device interposed between the first and second members A and B that vibrate in a relatively linear direction to suppress the relative vibration, And one of the second support members 2, 12, 3, and 13 are coupled to the first member A, and the other is coupled to the second member B, and both are engaged with each other so as to be capable of relative displacement with vibration. The holding portions 2b and 15 for holding the magnetic friction members 7 and 17 are provided on one of the first or second support members 2, 12, 3 and 13, and the support members 3 and 17 are provided on the holding portions 2b and 15 respectively. The magnetic friction members 7 and 17 are movably held so as to be attracted to the 12 magnetic suction plates 4 and 14 to constitute the magnetic friction damping devices 1 and 11. The plates 4 and 14 are provided with a ferromagnetic portion and a weak magnetic portion, and the magnetic friction members 7 and 17 and the magnetic adsorption plates 4 and 4 are provided. 4, the attraction force on the magnetic attraction surface of the magnetic friction members 7, 17, that is, the vibration suppression force is changed in accordance with the relative displacement with respect to the magnetic friction member 4. The braking force can be changed as desired in a relatively easy manner according to the amount of displacement involved.
[Brief description of the drawings]
FIG. 1 is a front view of a vibration damping device.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an exploded perspective view of the vibration damping device.
FIG. 4 is a cross-sectional view of a vibration damping device according to another embodiment.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is an exploded perspective view of a holding portion and a magnetic friction member.
[Explanation of symbols]
1 Damping device 2 First support member (case)
2b Opening (holding part)
3 Second support member (insert)
4 Magnetic Suction Plate 7 Magnetic Friction Member A First Member B Second Member 11 Damping Device 12 First Support Member (Case)
13 Second support member (insert)
14 Magnetic adsorption plate 15 Holding part 17 Magnetic friction member

Claims (7)

A damping device interposed between first and second members that vibrate in a relatively linear direction to suppress the relative vibration, and is engaged with each other so as to be relatively displaceable with the vibration. In order to hold the first and second support members, one of which is coupled to the first member and the other of which is coupled to the second member, and the magnetic friction member, the first or second member comprising a holding portion provided on one of the support member, and a magnetic friction member which is movably held by the holding portion so as to be adsorbed by the magnetic attracting surface of the other of the support member strength to the magnetic attraction surface A magnetic friction damping device comprising a magnetic part and a weak magnetic part, wherein an attractive force of the magnetic friction member to the magnetic adsorption surface changes with relative displacement between the magnetic friction member and the magnetic adsorption surface .    The magnetic friction type vibration damping device according to claim 1, wherein one of the first and second support members includes a case, and the other support member is inserted into the case so as to freely enter and exit. The case includes the holding portion, the other support member includes a magnetic adsorption surface, and the magnetic friction member is movable to the magnetic adsorption surface in a direction perpendicular to the magnetic adsorption surface so as to be attracted to the magnetic adsorption surface. The magnetic friction type vibration damping device according to claim 2, wherein the magnetic friction type vibration damping device is held. The case has an opening as the holding portion, the other support member has a magnetic attracting surface corresponding to the opening, and the magnetic friction member can be attracted to the magnetic attracting surface in a direction perpendicular to the magnetic attracting surface. magnetic friction damping device according to claim 2, characterized in that it is fitted freely in the opening moved to. The case is provided with an opening as the holding portion on the opposite side wall and is formed of a rectangular box that is open in one direction orthogonal to the opposite side wall, and the other support member is inserted into the case from the opening portion of the case. A plate-like portion inserted in and out of the plate-like portion, the plate-like portion having the magnetic adsorption surface facing the opening on both sides of the plate-like portion, so that the magnetic friction member can be adsorbed to the magnetic adsorption surface; magnetic friction damping device according to any one of claims 2 to 4, characterized in that it is fitted freely in the opening movement in the direction perpendicular to the. The case is formed of a cylindrical body opened to one end side, and a magnetic adsorption plate having the magnetic adsorption surface is provided on an inner peripheral side of the case, and one end side of the other support member is disposed in the case from the open portion. It is inserted in the axial direction so as to be freely movable and provided in the case with the holding portion, and the magnetic friction member is held by the holding portion so as to be movable in the radial direction so as to be attracted to the magnetic adsorption surface. The magnetic friction type vibration damping device according to claim 2, wherein the vibration damping device is a magnetic friction type vibration damping device. A damping device interposed between the first and second members that vibrate in a relatively linear direction to suppress the relative vibration,
The first and second support members are engaged with each other so as to be relatively displaceable with the vibration, and either one is coupled to the first member and the other is coupled to the second member.
One of the first or second support member includes a case made of a cylindrical body opened to one end side, and a magnetic adsorption plate along the inner periphery of the case is provided inside the case,
One end side of the other support member is inserted into the case so as to freely enter and exit in the axial direction, and includes a magnetic friction member holding portion located inside the magnetic adsorption plate in the case,
A magnetic friction damping device, wherein a magnetic friction member is held by a holding portion of the other support member so that the magnetic friction member can be attracted to the magnetic adsorption plate positioned radially outward .

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