JP4427852B2 - Sliding bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sliding bearing device, and more particularly to a sliding bearing device having a cover.
[0002]
[Prior art]
In order to make buildings and mechanical facilities seismic isolation structures, sliding bearing devices in which sliding bearing members are slidably disposed on a smooth plate are becoming widespread. As this sliding support member, a member in which a low friction material layer such as polytetrafluoroethylene (PTFE) is provided on the lower surface of a laminate of a hard plate such as a metal plate and a soft plate such as rubber is often used. As the smooth plate, a stainless steel plate is usually used.
[0003]
In such a sliding support device, the laminated body on which the PTFE material is mounted slides on the counterpart stainless steel plate during vibration such as an earthquake, and the vibration force such as an earthquake is absorbed.
[0004]
[Problems to be solved by the invention]
The vibration absorption (damping) of the sliding bearing device is caused by the friction between the sliding bearing member and the smooth plate. This frictional force is the product of the coefficient of friction and the load. It depends on.
[0005]
For this reason, in the conventional sliding bearing device, there is a case where the damping is affected by the load and the stable damping performance cannot be exhibited.
[0006]
An object of the present invention is to provide a sliding bearing device that can obtain a stable damping performance without being influenced by the magnitude of a load at all or almost.
[0007]
[Means for Solving the Problems]
The sliding bearing device of the present invention (Claim 1) is a sliding bearing device having a smooth plate and a sliding bearing member slidably disposed on the smooth plate. A first sliding bearing member having a small friction coefficient and a second sliding bearing member having a large friction coefficient with the smooth plate are disposed, and the load of the supported member is relative to the first sliding bearing member. A sliding bearing device applied directly to the second sliding bearing member via an elastic body made of a spring or rubber , wherein the first sliding bearing member comprises the second sliding bearing member. It is arranged so as to straddle the sliding support member, and the elastic body is interposed between the straddling portion and the second sliding support member, and when there is no load, the first support member is A distance d from the plate, and the second support member is in contact with the smooth plate, Wherein when a load from above is added, the first bearing member is also in contact with the smooth plate, that the supporting member of the second applied load multiplied by the displacement d in the modulus k of the elastic body It is what.
[0008]
In such a sliding bearing device, the load of the supported member is directly applied to the first sliding bearing member, and is applied to the second sliding bearing member via the elastic body. At the time of loading, as long as the first sliding support member is in contact with the smooth plate, the distance between the supported member and the smooth plate is constant, so the amount of displacement of the elastic body is always constant, The load applied to the second support member via the through hole is also constant. Accordingly, the damping is almost determined by the friction between the second support member and the smooth plate, and the damping characteristic becomes substantially constant regardless of the magnitude of the load.
[0010]
The sliding bearing device of the present invention (Claim 4) is a sliding bearing device having a smooth plate and a sliding bearing member slidably disposed on the smooth plate. A first sliding bearing member having a small friction coefficient and a second sliding bearing member having a large friction coefficient with the smooth plate are disposed, and the first sliding bearing member and the second sliding bearing member are arranged . A receiving plate is disposed above, a first spring is interposed between the first sliding support member and the receiving plate, and between the second sliding support member and the receiving plate, A second spring having a smaller elastic coefficient than that of the first spring is interposed, and a first rod projects upward from the first sliding support member, and the first rod is 1 is inserted into a first hole provided in the receiving plate, and the second rod protrudes upward from the second sliding support member. Is, the second rod is characterized in that it is inserted into a second hole provided on the receiving Uketamawaita inserted through the second spring.
[0011]
In such a sliding bearing device, during loading, a load is applied to the first sliding bearing member via the first spring having a large elastic coefficient, and the elastic coefficient is applied to the second sliding bearing member. A load is applied indicating a small second spring . When the elastic modulus of the first spring keep extremely (e.g. as 10-fold or more of claims 5) larger than the elastic coefficient of the second spring, the smoothing plate and the supported regardless of the magnitude of the load The distance from the member does not change so much, and the load applied to the second sliding support member via the second spring does not change so much. As a result, the frictional force generated by the second sliding support member does not change so much regardless of the magnitude of the load, and becomes substantially constant.
[0012]
Also in this case, since the damping of the sliding bearing device is mainly caused by the frictional force of the second sliding bearing member, the damping characteristics of the sliding bearing device are substantially constant regardless of the magnitude of the load.
[0013]
In the sliding support device according to claim 4, when the elastic coefficient of the first elastic body is substantially infinite, it corresponds to the sliding support device according to claim 1.
[0014]
In the present invention, the friction coefficient of the first sliding support member is preferably twice or more than the friction coefficient of the first sliding support member.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 is a cross-sectional view showing a sliding bearing device according to an embodiment of the present invention. FIG. 1 (a) shows no load, and FIG. 1 (b) shows a loaded state.
[0018]
In this embodiment, a smooth plate 3 made of, for example, stainless steel is fixedly installed on a foundation bottom plate made of concrete or the like. First and second sliding bearing members 1 and 2 are slidably disposed on the smooth plate 3. A first friction plate 1 a having a small friction coefficient is provided on the bottom surface of the first sliding support member 1, and a second friction plate 2 a having a large friction coefficient is provided on the bottom surface of the second sliding support member 2. Yes.
[0019]
The first sliding bearing member 1 is disposed so as to straddle the second sliding bearing member 2, and an elastic body (in this embodiment, a coil spring) 4 is interposed between the straddled portion and the second sliding bearing member 2. Intervened.
[0020]
The first sliding support member may be U-shaped across the second sliding support member, but has a concave hole in the center of the bottom surface (the second supporting member is accommodated in the concave hole). The thing of the shape which was made may be sufficient. Although depending on the area of the friction plate, the friction coefficient of the second friction plate 2a is, for example, about 2 to 10 times the friction coefficient of the first friction plate 1a.
[0021]
In the sliding support device configured as described above, the first support member 1 is separated from the smooth plate 3 by a distance d when there is no load, as shown in FIG. The second support member 2 is in contact with the smooth plate 3. When the load P is applied, the first support member 1 also contacts the smooth plate 3 as shown in FIG. 1B, and the second support member 2 has a load Pc obtained by multiplying the elastic coefficient k of the elastic body 4 by the displacement d. (Not shown) is added.
[0022]
Since d is constant as long as the first support member 1 is in contact with the smooth plate 3, the load Pc applied to the second support member 2 is constant regardless of the magnitude of the load P.
[0023]
Accordingly, the second support member 2 generates a constant frictional force (attenuation) F _{2 formed} by the product of the friction coefficient and the load Pc.
[0024]
The first support member 1 generates a frictional force F ₁ that is the product of the friction coefficient and the load P. This friction force F ₁ is proportional to the magnitude of the load P. However, by making the friction coefficient of the first support member 1 significantly smaller than the friction coefficient of the second support member 2, the total friction is obtained. The force F = F ₁ + F ₂ is always constant and is approximately equal to F ₂ .
[0025]
Therefore, the sliding bearing device of FIG. 1 always exhibits a substantially constant damping characteristic.
[0026]
FIG. 2 is a cross-sectional view of a sliding bearing device according to another embodiment.
[0027]
In this embodiment, the first sliding support member 6 and the second sliding support member 7 are disposed between the common receiving plate 10 and the smooth plate 3, and the space between the supporting member 6 and the receiving plate 10 is the same. The elastic body 8 is interposed between the support member 7 and the receiving plate 10. In this embodiment, the elastic bodies 8 and 9 are coil springs.
[0028]
The friction coefficient of the friction plate 7a on the bottom surface of the second support member is, for example, about 2 to 10 times the friction coefficient of the friction plate 6a on the bottom surface of the first support member. The elastic coefficient k ₁ of the elastic body 8 is about 10 to 100 times the elastic coefficient k ₂ of the elastic body 1.
[0029]
In order to prevent buckling of the elastic bodies 8, 9, a rod 12 protruding upward from the support members 6, 7 is inserted into the hole 11 of the receiving plate 10.
[0030]
When a load P is applied to the sliding bearing device configured as described above, the receiving plate 10 is slightly lowered. However, since the elastic coefficient k ₁ of the elastic body 8 is large, the amount of displacement is extremely small. The load applied to the sliding support member 7 through the through hole hardly changes. Since most of the frictional force (damping) generated by the sliding bearing device is generated by the friction between the friction plate 7a of the bearing member 7 and the smooth plate 3, the load applied to the bearing member 7 is substantially P. It is almost constant regardless of size. As a result, this attenuation is substantially constant regardless of the magnitude of P.
[0031]
In addition, the said embodiment is an example of this invention, and it is clear that the number and shape of a supporting member are not limited to the thing of illustration.
[0032]
【The invention's effect】
As described above, according to the present invention, there is provided a sliding bearing device capable of obtaining a stable damping performance without being influenced at all or almost by the magnitude of the load.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a sliding bearing device according to an embodiment.
FIG. 2 is a cross-sectional view of a sliding bearing device according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,6 1st sliding support member 2,7 2nd sliding support member 3 Smooth plate 4,8,9 Elastic body 1a, 2a, 6a, 7a Friction plate

Claims (6)

In a sliding bearing device having a smooth plate and a sliding bearing member slidably disposed on the smooth plate,
As the sliding support member, a first sliding support member having a small friction coefficient with the smooth plate and a second sliding support member having a large friction coefficient with the smooth plate are arranged,
Load of the bearing member is directly applied for the first sliding bearing element, for the second sliding bearing member was in sliding bearings device applied through the elastic body made of a spring or rubber And
The first sliding support member is disposed so as to straddle the second sliding support member, and the elastic body is interposed between the straddled portion and the second sliding support member,
When there is no load, the first support member is separated from the smooth plate by a distance d, and the second support member is in contact with the smooth plate,
When a load is applied to the support device from above, the first support member also comes into contact with the smooth plate, and a load obtained by multiplying the elastic coefficient k of the elastic body by the displacement d is applied to the second support member. A sliding bearing device characterized by that. 2. The sliding bearing device according to claim 1, wherein the first sliding bearing member is U-shaped and disposed on both sides of the second sliding bearing member across the second sliding bearing member. 2. The sliding bearing device according to claim 1, wherein the first sliding bearing member has a concave hole in the bottom surface in which the second bearing member is accommodated. In a sliding bearing device having a smooth plate and a sliding bearing member slidably disposed on the smooth plate,
As the sliding support member, a first sliding support member having a small friction coefficient with the smooth plate and a second sliding support member having a large friction coefficient with the smooth plate are arranged,
A receiving plate is disposed above the first sliding support member and the second sliding support member;
A first spring is interposed between the first sliding support member and the receiving plate, and an elastic coefficient is larger than that of the first spring between the second sliding support member and the receiving plate. There is a second spring that is small,
A first rod protrudes upward from the first sliding support member, and the first rod is inserted into the first hole provided in the receiving plate through the first spring. And
A second rod protrudes upward from the second sliding support member, and the second rod is inserted into a second hole provided in the receiving plate through the second spring. sliding bearing apparatus characterized by there.   5. The sliding bearing device according to claim 4, wherein an elastic coefficient of the first elastic body is 10 times or more of an elastic coefficient of the second elastic body.   6. The sliding bearing device according to claim 1, wherein the friction coefficient of the second sliding bearing member is at least twice that of the first sliding bearing member.

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