Support device

Abstract

To provide a bearing device capable of changing sliding property according to a sliding direction.SOLUTION: A sliding bearing device 1 is composed of an upper shoe 10 and a lower shoe 20 arranged in respective opposite parts in an upper structure 200 and a lower structure 300, in which: sliding surfaces 10a, 20a in the opposite parts of the upper shoe 10 and the lower shoe 20 slide against each other; the upper shoe 10 includes a sliding material 12 constituting the upper shoe sliding surfaces 10a; the lower shoe 20 includes a slide plate 22 constituting the lower shoe sliding surfaces 20a and wider than the sliding material 12; and the lower shoe sliding surfaces 20a of the slide plate 22 has formed therein a surface processing part 23 in which a frictional coefficient μ1 in sliding in an opposite prescribed direction Y is higher than a frictional coefficient μ2 in sliding in a prescribed direction X.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bearing device in a support structure that is arranged, for example, between an upper structure and a lower structure and that supports the upper structure with the lower structure. [Background technology]

[0002] Conventionally, there have been bearing devices that provide movable support in structures where vibrations or relative displacement occur, such as seismic isolation structures or connection parts that connect fixed structures together. As disclosed in Patent Document 1, these bearing devices are equipped with an upper shoe provided on the upper structure and a lower shoe provided on the lower structure, and are configured so that the sliding surfaces of the upper shoe and the lower shoe slide against each other to provide movable support.

[0003] However, a bearing device that slides horizontally, such as the bearing device disclosed in Patent Document 1, slides with the same coefficient of friction regardless of the direction it slides in. Therefore, for example, if the sliding surface is configured with a high coefficient of friction to withstand large-scale earthquake motion, once it slides and moves relative to the surface due to the input of earthquake motion, it is necessary to apply an external force of the same magnitude as the large-scale earthquake motion to return it to its initial position (assembly position), and it was only possible for it to slide with the same slidability regardless of the sliding direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-225016 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a bearing device capable of changing the slidability depending on the sliding direction. [Means for solving the problem]

[0006] This invention is a bearing device comprising a first shoe and a second shoe arranged at opposing portions of a first structure and a second structure, wherein the sliding surfaces of the opposing portions of the first shoe and the second shoe slide against each other, wherein one of the first shoe and the second shoe is provided with a sliding member that constitutes the sliding surface, and the other of the first shoe and the second shoe is provided with a sliding plate that constitutes the sliding surface and is wider than the sliding member, and wherein an anisotropic friction portion is formed on at least a part of the sliding surface of at least one of the sliding plate and the sliding member, in which the friction coefficient for sliding in a counter-predetermined direction, that is the opposite direction of the predetermined direction, is higher than the friction coefficient for sliding in the predetermined direction.

[0007] The first and second structures may be, for example, a building with a building as the first structure and a foundation structure as the second structure, a bridge with a pier as the second structure and a main girder as the first structure, a connecting passage with a building as the second structure and a walkway connecting two buildings as the first structure, a roof structure with a column as the second structure and a truss roof as the first structure, or structures in an expansion structure with a building as the second structure and another building as the first structure. Alternatively, the first structure may be a server and a rack as the second structure.

[0008] The above-mentioned bearing devices include bearing devices of various structures such as rigid sliding bearings and elastic sliding bearings. The above-mentioned coefficient of friction means that at least one of the static coefficient of friction and the dynamic coefficient of friction is higher than the coefficient of friction of other portions.

[0009] The above-mentioned "an anisotropic friction portion is formed on at least a part of the sliding surface of at least one of the sliding plate material and the sliding member" means that an anisotropic friction portion is formed on a part or all of the sliding surface of the sliding plate material, a part or all of the sliding surface of the sliding member, a part of the sliding surface of the sliding plate material and a part or all of the sliding surface of the sliding member, or even a part or all of the sliding surface of the sliding plate material and a part or all of the sliding surface of the sliding member.

[0010] According to this invention, the slidability can be changed depending on the sliding direction. In more detail, since an anisotropic friction portion is formed on at least a portion of the sliding surface of at least one of the sliding plate material and the sliding member, the sliding member and the sliding plate material can slide in a predetermined direction with a smaller external force than the sliding member and the sliding plate material can slide in an opposite direction.

[0011] In this way, by providing the anisotropic friction portion on at least a part of the sliding surface of at least one of the sliding member and the sliding plate material, the sliding properties can be changed depending on the sliding direction, and the sliding distance can be changed with the same external force, or the same sliding distance can be slid with different external forces.

[0012] As an aspect of the present invention, the sliding plate may be formed to be wider than the sliding member in all in-plane directions. According to the present invention, in a bearing device that is slidable in all directions, the slidability can be changed depending on the sliding direction.

[0013] The sliding plate material, which is formed wider than the sliding member in all directions in the above-mentioned in-plane direction, can have any suitable shape in plan view, such as a circle, a polygon such as an octagon, or an ellipse.

[0014] In another aspect of the present invention, the anisotropic friction portion is provided on the sliding surface of the sliding plate material, the predetermined direction is the direction in which the sliding member slides against the sliding plate material from the outside to the inside in the in-plane direction, and the anti-predetermined direction is the direction in which the sliding member slides against the sliding plate material from the inside to the outside in the in-plane direction.

[0015] The above-mentioned outside and inside in the in-plane direction refer to the outside and inside in a planar view of a horizontal sliding plate, and if the sliding plate is circular in a planar view, they become the radial outside and inside, i.e., directions along the radial direction of the sliding plate which is circular in a planar view. According to this invention, the sliding member can be slid from outside to inside with a smaller external force than when the sliding member slides from inside to outside in the in-plane direction. Therefore, for example, after the sliding member slides from inside to outside in the in-plane direction due to the input of a large-scale earthquake motion, the sliding member can be returned to its original assembly position with an external force smaller than the large-scale earthquake motion.

[0016] In another aspect of the present invention, a general friction portion is provided on the inside of the in-plane direction of the sliding surface of the sliding plate, and the anisotropic friction portion is provided on the outside of the general friction portion, the sliding member sliding from the outside to the inside in the in-plane direction relative to the sliding plate, and the anti-specified direction may be the direction in which the sliding member slides from the inside to the outside in the in-plane direction relative to the sliding plate. The friction coefficient of the general friction portion and the friction coefficient of the anisotropic friction portion in a predetermined direction may be the same or different, provided that they are smaller than the friction coefficient of the anisotropic friction portion in the opposite direction.

[0017] According to this invention, the sliding member slides on the general friction portion until a large external force is applied that causes the anisotropic friction portion to slide outward, and when the large external force is applied, the sliding member slides on the anisotropic friction portion from the inside to the outside in the in-plane direction. After the sliding member slides on the anisotropic friction portion, it can return to its original position by sliding from the outside to the inside in the in-plane direction with a small force.

[0018] Therefore, for example, when a small external force such as wind load or a medium-sized earthquake (Level 1) that may occur once every few decades is applied, the sliding member slides on the general friction portion, and when a large external force such as a large-scale earthquake such as a major earthquake (Level 2) that may occur once every few hundred years or an extremely large earthquake (Level 3) that may occur once every few thousand years is applied, the sliding member slides on the anisotropic friction portion.

[0019] In another aspect of the present invention, the sliding plate material may be formed wider than the sliding member in the specified in-plane direction, and one of the first shoe and the second shoe equipped with the sliding member may be provided with a regulating portion that regulates sliding in a direction perpendicular to the specified direction. According to the present invention, in a bearing device that is slidable in one direction along a predetermined direction, the slidability can be changed depending on the sliding direction.

[0020] In another aspect of the present invention, the anisotropic friction portion is provided on the sliding surface of the sliding plate between an assembly position where the sliding member is positioned in an assembly state in which the first shoe and the second shoe are assembled, and the end portions on both sides of the predetermined direction, and the predetermined direction may be a direction in which the sliding member slides relative to the sliding plate from the end portions toward the assembly position, and the anti-predetermined direction may be a direction in which the sliding member slides relative to the sliding plate from the assembly position toward the end portions. The above-mentioned assembly position is the initial position where the sliding member is disposed relative to the sliding plate in the initial state before movement (sliding) in a movably supported support device.

[0021] This invention allows the sliding member to slide in the direction returning to the assembly position with an external force smaller than the external force acting when the sliding member slides from the assembly position toward either end relative to the sliding plate material.

[0022] In another aspect of the present invention, the anisotropic friction portion is provided on the sliding surface of the sliding plate between an assembly position where the sliding member is positioned in an assembled state in which the first shoe and the second shoe are assembled, and one of the ends on both sides in the predetermined direction, and a general friction portion is provided between the assembly position and the other end, the general friction portion having a friction coefficient that does not change depending on the sliding direction and is smaller than the friction coefficient of the anisotropic friction portion, and the predetermined direction may be the direction in which the sliding member slides relative to the sliding plate from the end toward the assembly position, and the anti-predetermined direction may be the direction in which the sliding member slides relative to the sliding plate from the assembly position toward the end.

[0023] According to this invention, the sliding member can be slid relative to the sliding plate material in the direction from the assembly position toward the opposite end where the general friction portion is provided with an external force that is smaller than the external force required when the sliding member slides relative to the sliding plate material in the direction from the assembly position toward the end where the anisotropic friction portion is provided, and the sliding member that has slid relative to the sliding plate material from the assembly position toward the end where the anisotropic friction portion is provided can be returned to the assembly position with a small external force.

[0024] In another aspect of the present invention, a general friction portion, whose friction coefficient does not change depending on the sliding direction and is smaller than the friction coefficient of the anisotropic friction portion, is provided on the inside of the in-plane direction of the sliding surface of the sliding plate, and the anisotropic friction portion is provided on the outside of the general friction portion in the predetermined direction, the predetermined direction being the direction in which the sliding member slides relative to the sliding plate from the outside toward the general friction portion, and the anti-predetermined direction being the direction in which the sliding member slides relative to the sliding plate from the general friction portion toward the outside.

[0025] According to this invention, the sliding member slides on the general friction portion until a large external force acts on the sliding plate material such that the anisotropic friction portion slides toward the end, and when the large external force acts, the sliding member slides on the anisotropic friction portion toward the end. After the sliding member slides on the anisotropic friction portion against the sliding plate material, it can slide back from the end toward the assembly position with a small force.

[0026] Therefore, for example, when a small external force such as wind load or a medium-sized earthquake (LV1) that may occur once every few decades is applied, the sliding member slides against the sliding plate material at the general friction portion, and when a large external force such as a large-scale seismic motion such as a major earthquake (LV2) that may occur once every few hundred years or an extremely large earthquake (LV3) that may occur once every few thousand years is applied, the sliding member slides against the sliding plate material at the anisotropic friction portion.

[0027] As another aspect of the present invention, the sliding member may be made of a filled resin in which a filler is mixed. This invention allows the construction of a sliding member that has the desired sliding properties and, because the filler is mixed in, a predetermined strength, thereby suppressing wear of the sliding member even when sliding in the anti-predetermined direction, which has a higher friction coefficient than sliding in the predetermined direction, in the anisotropic friction portion.

[0028] As another aspect of the present invention, the anisotropic friction portion may be provided on the sliding surface of the sliding plate. According to this invention, the anisotropic friction portion can be formed in various ways, such as forming the anisotropic friction portion on the entire sliding surface of the sliding plate material, forming it on a part of the surface, or forming the anisotropic friction portion on the entire surface but with a different predetermined direction.

[0029] In another aspect of the present invention, the length in the specified direction between the assembly position and the one end, where the anisotropic friction portion is provided, may be shorter than the length in the specified direction between the assembly position and the other end, where the general friction portion is provided.

[0030] According to this invention, when an external force of the same magnitude is applied, the sliding distance of the sliding member on the side of the anisotropic friction portion from the assembly position can be made shorter than the sliding distance of the sliding member on the side of the general friction portion from the assembly position. Furthermore, the sliding member that has slid from the assembly position toward the end of the anisotropic friction portion relative to the sliding plate can be returned to the assembly position with a small external force. In other words, the sliding distance of the sliding member on the side of the anisotropic friction portion can be made shorter than the range of movement of the sliding member on the side of the general friction portion from the assembly position. This allows the device to be used, for example, in an environment where the range of movement of the sliding member must be narrowed on one side of the assembly position.

[0031] In another aspect of the present invention, the first structure may be an upper structure, the second structure may be a lower structure that supports the upper structure, the first shoe may be an upper shoe fixed to the upper structure, and the second shoe may be a lower shoe fixed to the lower structure.

[0032] According to this invention, a sliding member is provided on the upper shoe fixed to the upper structure, and a sliding plate material wider than the sliding member is provided on the lower shoe fixed to the lower structure, so that a more stable movable support can be achieved than with a support device in which a sliding plate material is provided on the upper shoe fixed to the upper structure and a sliding member is provided on the lower shoe fixed to the lower structure. [Effects of the Invention]

[0033] According to the present invention, it is possible to provide a bearing device capable of changing slidability depending on the sliding direction. [Brief explanation of the drawings]

[0034] [Figure 1] Schematic cross-sectional view of a sliding bearing device. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is an explanatory diagram of a sliding bearing device according to another embodiment. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is an explanatory diagram of a one-way sliding bearing device according to another embodiment. [Figure 10] FIG. 10 is an explanatory diagram of a one-way sliding bearing device according to yet another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0035] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of the sliding bearing device 1, FIG. 2 shows an exploded perspective view of the sliding bearing device 1, and FIG.

[0036] In detail, Figure 3(a) shows a plan view of the slide plate 22, Figure 3(b) shows a view taken along the arrow AA in Figure 3(a), Figure 3(c) shows an enlarged view of part a in Figure 3(b), and Figure 3(d) shows a friction coefficient history loop diagram of the displacement of the sliding bearing device 1 and the friction coefficient.

[0037] In Fig. 3(a), the sliding member 12 at the assembly position Z is indicated by a broken line. In Fig. 3(b), the slide plate 22 of the lower shoe 20 is not shown.

[0038] The sliding bearing device 1 is a seismic isolation device arranged between the upper structure 200 and the lower structure 300 that make up the seismic isolation structure 100, and is composed of an upper shoe 10 fixed to the upper structure 200 and a lower shoe 20 fixed to the lower structure 300, and the boundary surfaces between the upper shoe 10 and the lower shoe 20, i.e., the sliding surfaces 10a, 20a, slide to provide support that allows for displacement in the in-plane direction at the boundary surface (sliding surface), and can absorb vibration energy caused by, for example, earthquakes or strong winds, thereby providing seismic isolation.

[0039] The sliding bearing device 1 is used in conjunction with a rubber bearing device (not shown) or the like for returning the upper structure 200 that has moved relative to the lower structure 300 to the assembly position Z. Here, the assembly position Z is the initial position where the sliding member 12 is arranged relative to the slide plate 22 in the initial state before the upper shoe 10 moves (slides) relative to the lower shoe 20 in the sliding bearing device 1 that can be movably supported.

[0040] More specifically, as shown in FIG. 1, the sliding bearing device 1 is composed of an upper shoe 10 fixed to the bottom surface 200a of the upper structure 200 and a lower shoe 20 fixed to the upper surface 300a of the lower structure 300.

[0041] The upper shoe 10 is composed of a sliding member holder 11 fixed to the bottom surface 200 a of the upper structure 200 and a sliding member 12 held by the sliding member holder 11 . The sliding member holder 11 is integrally formed with an attachment portion 11a fixed to the bottom surface 200a of the upper structure 200 and a cylindrical base portion 11b protruding downward from the attachment portion 11a.

[0042] The sliding member 12 is a disk-shaped member fixed to the bottom surface of the base portion 11b and has an appropriate sliding property. The sliding member 12 is formed with a diameter slightly smaller than that of the base portion 11b. Specifically, the sliding member 12 is a self-lubricating, circular plate-like member in plan view, made of PTFE with a low coefficient of friction. More specifically, it is made of filled PTFE containing glass fiber at a blending ratio of 10 to 30%. In this way, the bottom surface 12a of the sliding member 12 made of filled PTFE containing glass fiber as a filler constitutes the upper shoe sliding surface 10a of the upper shoe 10 and has a predetermined sliding property. Note that the sliding member 12 does not have to be made of filled PTFE as long as it satisfies the predetermined required performance, and a predetermined material other than glass fiber may be used as the filler.

[0043] As shown in FIG. 2, the lower shoe 20 is composed of a back plate 21 fixed to the upper surface 300a of the lower structure 300 and a slide plate 22 attached to the back plate 21, and the upper surface 22a of the slide plate 22 forms the lower shoe sliding surface 20a that slides against the upper shoe sliding surface 10a of the upper shoe 10 described above.

[0044] As shown in FIGS. 2 and 3, the back plate 21 is formed in a square shape in a plan view, and the slide plate 22 is formed in an octagonal shape in a plan view that is slightly smaller than the back plate 21, and is installed horizontally.

[0045] The slide plate 22 is made of a plate material of austenitic stainless steel (SUS304) having a predetermined thickness. However, the slide plate 22 is not limited to austenitic stainless steel and may be made of a plate material made of any other appropriate material as long as it can be subjected to a surface treatment, which will be described later, and other required performances are satisfied. The upper surface 22a of the slide plate 22 is provided with a surface treatment 23, which is subjected to a surface treatment described later.

[0046] The surface treatment part 23 forms irregularities 24 on the upper surface 22a of the slide plate 22 by blasting or the like so that when the sliding material 12 slides against the slide plate 22 from the center in a planar view toward the outside in a planar view, a high friction coefficient μ1 is obtained, and when the sliding material 12 slides against the slide plate 22 from the outside in a planar view toward the center in a planar view, a friction coefficient μ2 lower than the friction coefficient μ1 is obtained.

[0047] The above-mentioned friction coefficients μ1 and μ2 are higher than at least the dynamic friction coefficient out of the static friction coefficient and the dynamic friction coefficient. The direction from the outside in plan view toward the center in plan view is defined as a predetermined direction X, and the direction from the center in sliding plan view toward the outside in plan view is defined as an anti-predetermined direction Y.

[0048] 3(c), the unevenness 24 has a substantially triangular cross-sectional shape with a steep inclination angle at the center in plan view and a gentle inclination angle at the outer sides in plan view, and this is formed continuously along the radial direction. As a result, when the sliding member 12 slides against the slide plate 22 in the counter-predetermined direction Y, it slides on the inclined surface side with the steep inclination angle of the unevenness 24, so the friction coefficient is friction coefficient μ1, and when sliding in the predetermined direction X, it slides on the inclined surface side with the gentle inclination angle of the unevenness 24, so the friction coefficient is friction coefficient μ2, which is lower than friction coefficient μ1.

[0049] The unevenness 24 as described above may be formed, for example, by blasting processing in which blast material is sprayed from the direction of the incident angle, laser processing in which laser light is irradiated from the direction of the incident angle, etching processing, or the slide plate 22 itself having the unevenness 24 may be formed by three-dimensional lamination processing.

[0050] Furthermore, the unevenness 24 is not limited to the shape described above as long as it can be formed so that the inclination angle in the predetermined direction X and the inclination angle in the anti-predetermined direction Y are different, and can be formed in various cross-sectional shapes, such as a parallelogram cross-section or a trapezoid cross-section. Furthermore, the irregularities 24 may not be arranged continuously in the radial direction, but may be arranged at intervals, or may be arranged, for example, in a spiral shape in plan view, or in a staggered pattern.

[0051] When the sliding bearing device 1, which is composed of the lower shoe 20 having the surface treatment 23 with the unevenness 24 formed on the upper surface 22a of the slide plate 22, and the upper shoe 10, is vibrated, a friction coefficient history loop diagram as shown in Figure 3(d) is obtained. In the friction coefficient history loop diagram shown in FIG. 3(d), the horizontal axis represents displacement δ and the vertical axis represents friction coefficient μ.

[0052] As shown in the first quadrant at the top right of the friction coefficient history loop diagram in Figure 3(d), when the sliding member 12 arranged at the center of the slide plate 22 in a planar view slides outward in the counter-predetermined direction Y in a planar view, the friction coefficient μ gradually increases toward the friction coefficient μ1, and after sliding a predetermined distance in the counter-predetermined direction Y, the friction coefficient μ becomes μ1.

[0053] As the sliding continues in the counter-predetermined direction Y, it stops near the outer edge in plan view, and then starts sliding in the predetermined direction X, where it slides at a friction coefficient μ2, as shown in the fourth quadrant at the bottom right of the friction coefficient history loop diagram in Figure 3(d). Then, as the sliding continues in the predetermined direction X for a predetermined distance, and approaches the center in plan view, the friction coefficient increases toward μ1.

[0054] Further, as shown in the third quadrant at the bottom left of the friction coefficient history loop diagram in Figure 3(d), when moving beyond the center of the plan view and toward the outside of the plan view on the opposite side, the friction coefficient μ increases further toward the friction coefficient μ1, and after sliding a predetermined distance in the opposite direction Y, the friction coefficient μ becomes μ1.

[0055] As the friction coefficient continues to slide in the counter-predetermined direction Y, it stops near the outer edge in plan view, and then slides in the predetermined direction X, where it slides at a friction coefficient μ2, as shown in the second quadrant in the upper left of the friction coefficient history loop diagram in Figure 3(d). Then, as the friction coefficient slides in the predetermined direction X for a predetermined distance and approaches the center in plan view, it increases toward a friction coefficient μ1.

[0056] In this way, the sliding bearing device 1 is composed of an upper shoe 10 and a lower shoe 20 arranged at opposing portions of the upper structure 200 and the lower structure 300, and the sliding surfaces 10a, 20a at the opposing portions of the upper shoe 10 and the lower shoe 20 slide against each other. The upper shoe 10 is provided with a sliding member 12 that forms the upper shoe sliding surface 10a, and the lower shoe 20 is provided with a slide plate 22 that forms the lower shoe sliding surface 20a and is wider than the sliding member 12. The lower shoe sliding surface 20a of the slide plate 22 is formed with a surface treatment 23 such that the friction coefficient μ1 when sliding in the anti-predetermined direction Y, which is the opposite direction of the predetermined direction X, is higher than the friction coefficient μ2 when sliding in the predetermined direction X, and therefore the sliding properties can be changed depending on the sliding direction.

[0057] In more detail, since the surface treatment portion 23 is formed on the lower shoe sliding surface 20a of the slide plate 22, the sliding member 12 can slide in the specified direction X with a smaller external force than the sliding member 12 in the opposite direction Y.

[0058] In this way, by providing the surface treatment portion 23 on the lower shoe sliding surface 20a of the slide plate 22, the sliding properties can be changed depending on the sliding direction, and the sliding distance can be changed with the same external force, or the same sliding distance can be slid with different external forces.

[0059] Furthermore, since the slide plate 22 is formed wider than the slide member 12 in all in-plane directions, the sliding bearing device 1, which is slidable in all directions, can change its slidability depending on the sliding direction.

[0060] Furthermore, the surface treatment part 23 is provided on the lower shoe sliding surface 20a of the slide plate 22, and the predetermined direction X is the direction in which the sliding material 12 slides relative to the slide plate 22 from the outside in plan view to the inside in plan view, and the anti-predetermined direction Y is the direction in which the sliding material 12 slides relative to the slide plate 22 from the inside in plan view to the outside in plan view, so that the sliding material 12 can be slid from the outside in plan view to the inside in plan view with a smaller external force than sliding of the sliding material 12 from the inside in plan view to the outside in plan view.

[0061] Therefore, for example, after the sliding material 12 slides from the inside to the outside in plan view due to the input of a large-scale earthquake motion, the sliding material 12 can be returned to its original assembly position Z with an external force smaller than the large-scale earthquake motion by using a rubber bearing device (not shown) or the like that is used in combination.

[0062] The sliding member 12 may also be made of a filled resin in which a filler is mixed. Therefore, the sliding material 12 has the desired sliding properties and, because the filler is mixed in, has a predetermined strength. Therefore, wear of the sliding material 12 can be suppressed even when sliding in the anti-predetermined direction Y, which has a higher friction coefficient than sliding in the predetermined direction X, in the surface treatment portion 23.

[0063] It should be noted that the sliding bearing device 1S may have a different slide plate 22S, as shown in Fig. 4. Fig. 4 shows an explanatory diagram of a sliding bearing device 1S according to another embodiment in which the slide plate 22 is different from the sliding bearing device 1 described above.

[0064] In detail, Figure 4(a) shows a plan view of slide plate 22S, Figure 4(b) shows a view taken along the arrow AA in Figure 4(a), Figure 4(c) shows an enlarged view of part b in Figure 4(b), Figure 4(d) shows an enlarged view of part b in Figure 4(b), and Figure 4(e) shows a friction coefficient history loop diagram of the displacement and friction coefficient of the sliding bearing device 1S.

[0065] In Fig. 4(a), the sliding member 12 at the assembly position Z is indicated by a broken line. In Fig. 4(b), the slide plate 22S of the lower shoe 20S is not shown.

[0066] In the sliding bearing device 1 described above, the surface treatment portion 23 consisting of irregularities 24 is formed on the entire upper surface 22a of the slide plate 22, but in the sliding bearing device 1S shown in Fig. 4, the surface treatment portion 23 is formed on only part of the upper surface 22a of the slide plate 22S. Note that the configuration of the sliding bearing device 1S other than the slide plate 22S is the same as the configuration of the sliding bearing device 1 described above, so the same reference numerals are used and their explanation will be omitted.

[0067] The slide plate 22S of the lower shoe 20S in the sliding bearing device 1S does not have a surface treatment 23 formed on the upper surface 22a at a location corresponding to the sliding member 12 at the assembly position Z, but only on the outer side when viewed in a plane. The circular portion on the upper surface 22a of the slide plate 22S where the surface treatment 23 is not formed, which corresponds to the sliding member 12 at the assembly position Z in the center in a plan view, is defined as a general friction portion 25.

[0068] The general friction portion 25 is circular and has the same diameter as the bottom surface 12a, which is the sliding surface of the sliding member 12, and has the general friction coefficient μ3 of the lower shoe 20S itself because it is not provided with the surface treatment portion 23. The general friction coefficient μ3 is a smaller friction coefficient than the friction coefficient μ2 of the surface treatment portion 23 for sliding in the predetermined direction X. The general friction portion 25 is circular with the same diameter as the bottom surface of the sliding member 12, but may be a circle one size larger or one size smaller, or may be a polygonal shape such as an octagon.

[0069] The surface treatment portion 23 formed on the outer side of the general friction portion 25 in a plan view has irregularities 24 arranged in a radial direction, as shown in Figures 4(c) and (d), similar to the surface treatment portion 23 formed on the upper surface 22a of the slide plate 22 of the sliding bearing device 1.

[0070] When the sliding bearing device 1S, which is composed of the lower shoe 20 having the surface treatment portion 23 with the unevenness 24 formed on the upper surface 22a of the slide plate 22S and the upper shoe 10, is vibrated, a friction coefficient history loop diagram as shown in Figure 4(e) is obtained. As shown in the first quadrant at the top right of the friction coefficient history loop diagram in Figure 4(e), when the sliding member 12 arranged at the center of the slide plate 22S in a planar view slides outward in the counter-predetermined direction Y in a planar view, the friction coefficient μ gradually increases toward the friction coefficient μ1, and after sliding a predetermined distance in the counter-predetermined direction Y, the friction coefficient μ becomes μ1.

[0071] As the sliding continues in the counter-predetermined direction Y, it stops near the outer edge in plan view, and then begins sliding in the predetermined direction X, where it slides at a friction coefficient μ2, as shown in the fourth quadrant at the bottom right of the friction coefficient history loop diagram in Figure 4(e). Then, as the sliding continues in the predetermined direction X for a predetermined distance, and approaches the center in plan view, the friction coefficient decreases to μ3.

[0072] Further, as shown in the third quadrant at the bottom left of the friction coefficient history loop diagram in Figure 4(e), when moving beyond the center of the plan view and toward the outside of the plan view on the opposite side, the friction coefficient μ increases further toward the friction coefficient μ1, and after sliding a predetermined distance in the opposite direction Y, the friction coefficient μ becomes μ1.

[0073] As the sliding continues in the counter-predetermined direction Y, it stops near the outer edge in plan view, and then begins sliding in the predetermined direction X, where it slides with a friction coefficient μ2, as shown in the second quadrant in the upper left of the friction coefficient history loop diagram in Figure 4(e). Then, as the sliding continues in the predetermined direction X for a predetermined distance, and approaches the center in plan view, the friction coefficient decreases to μ3.

[0074] In this way, the sliding bearing device 1S, which is composed of the upper shoe 10 and the lower shoe 20S having the slide plate 22S which has a general friction portion 25 at the center of the upper surface 22a in a planar view and on which the surface treatment portion 23 is formed on the outer side in a planar view, has the same effects as those of the sliding bearing device 1 described above, in addition to the effects achieved by the sliding bearing device 1 described above, in which the general friction portion 25, whose general friction coefficient μ3 is smaller than the friction coefficient of the surface treatment portion 23 and does not change depending on the sliding direction, is provided on the inner side in a planar view of the lower shoe sliding surface 20a of the slide plate 22S, and the surface treatment portion 23 is provided on the outer side in a planar view, the predetermined direction X is the direction in which the sliding material 12 slides against the slide plate 22S from the outer side in a planar view towards the inner side in a planar view, and the anti-predetermined direction Y is the direction in which the sliding material 12 slides against the slide plate 22S from the inner side in a planar view towards the outer side in a planar view. Therefore, the sliding material 12 slides on the general friction portion 25 until a large external force is applied that causes the surface treatment portion 23 to slide outward in plan view, and when a large external force is applied, the sliding material 12 slides on the surface treatment portion 23 from the inside in plan view to the outside in plan view. After the sliding material 12 has slid on the surface treatment portion 23, it can return to its original position by sliding with a small force from the outside in plan view to the inside in plan view.

[0075] Therefore, for example, when a small external force such as wind load or a medium-sized earthquake (LV1) that may occur once every few decades acts, the sliding material 12 slides on the general friction portion 25, and when a large external force such as a large-scale seismic movement such as a major earthquake (Level 2) that may occur once every few hundred years or an extremely large earthquake (Level 3) that may occur once every few thousand years acts, the sliding material 12 can slide on the surface treatment portion 23.

[0076] The sliding bearing devices 1, 1S described above are sliding bearing devices 1, 1S having slide plates 22, 22S that are wide in all directions relative to the sliding member 12, but may also be one-way bearing devices 1T that slide only in a predetermined direction. FIG. 5 shows a schematic perspective view of the one-way bearing device 1T, FIG. 6 shows an exploded perspective view of the one-way bearing device 1T, and FIGS. 7 and 8 show explanatory views of the one-way bearing device 1T.

[0077] In detail, Fig. 7(a) shows a plan view of the one-way bearing device 1T, Fig. 7(b) shows a front view of the one-way bearing device 1T, and Fig. 7(c) shows the left side view of the one-way bearing device 1T. Also, Fig. 8(a) shows a plan view of the lower shoe 20T, Fig. 8(b) shows a view taken from the arrow CC in Fig. 8(a), Fig. 8(c) shows an enlarged view of part d in Fig. 8(b), and Fig. 8(d) shows a friction coefficient history loop diagram of the displacement and friction coefficient of the one-way bearing device 1T.

[0078] The one-way support device 1T is composed of an upper shoe 10T fixed to the bottom surface of the upper structure and functioning as an upper shoe, and a lower shoe 20T fixed to the top surface of the lower structure and functioning as a lower shoe.

[0079] The lower shoe 20T, which functions as the lower shoe, is formed in a rectangular shape in plan view that is long in the extension direction L. The lower shoe 20T includes a sole plate 21T having an H-shaped cross section and made up of a wide base plate portion 21Ta, a rail portion 21Tb, and an overhanging flange portion 21Tc, and a slide plate 22T on the upper surface of the overhanging flange portion 21Tc. The slide plate 22T is made of a plate made of SUS with a polished surface, and is formed to have a length in the width direction W that is slightly larger than the outer diameter of a sliding member 12T described later.

[0080] On the upper surface 22a of the slide plate 22T, a surface treatment portion 23 having irregularities 24 is formed, similar to the surface treatment portion 23 formed on the upper surface 22a of the slide plate 22T of the sliding bearing device 1 described above. 8(c), the unevenness 24 has a generally triangular cross-sectional shape with a steep inclination angle at the center in the extension direction L and a gentle inclination angle at the end portions in the extension direction L, and this shape is continuously formed along the extension direction L. As a result, when the sliding member 12T slides against the slide plate 22T in the anti-predetermined direction Y, the unevenness 24 slides on the sloped surface side with the steep inclination angle, and therefore the friction coefficient is μ1, and when sliding in the predetermined direction X, the unevenness 24 slides on the sloped surface side with the gentle inclination angle, and therefore the friction coefficient is μ2, which is lower than μ1.

[0081] The upper shoe 10T is made of steel and is composed of a base pot 13T which is rectangular and elongated in the width direction W, and has a length in the width direction W that is approximately the same as that of the base plate portion 21Ta described above, and a sliding member 12T which is circular in plan view and is positioned in the center of the bottom side of the base pot 13T.

[0082] In detail, as shown in Figure 7(c), the upper shoe 10T is composed of an upper plate 112, an inverted concave base part 13T that is wider than the above-mentioned protruding flange part 21Tc, and a stopper 14T that protrudes from the lower end position of the base part 13T toward the rail part 21Tb at the lower end position of the protruding flange part 21Tc.

[0083] Although the base pot 13T and the stopper 14T are shown as an integrated unit in FIG. 7, the base pot 13T and the stopper 14T may be configured as separate units that are assembled together, or may be configured as an integrated unit.

[0084] The sliding material 12T attached to the center of the bottom side of the base pot 13T is a self-lubricating, circular plate-shaped body in plan view whose surface is made of fluororesin with a low coefficient of friction, and is configured to be able to slide against the slide plate 22T provided on the sole plate 21T.

[0085] The upper shoe 10T thus constructed is configured by attaching the sliding member 12T to the center of the bottom side of the base pot 13T and placing it from above the lower shoe 20T to function as the upper shoe, thereby forming a one-way bearing device 1T.

[0086] At this time, the bottom surface 12a of the sliding member 12T of the upper shoe 10T and the top surface 22a of the slide plate 22T of the lower shoe 20T come into contact and can slide in the extension direction L. In this way, the one-way support device 1T restricts the sliding direction in one direction, the extension direction L, but because a gap is formed in the width direction W between the inner surface of the base pot 13T and the side surface of the overhanging flange portion 21Tc, some sliding in the width direction W is permitted.

[0087] Furthermore, the one-way support device 1T is assembled such that the stopper 14T of the upper shoe 10T protrudes toward the rail portion 21Tb below the overhanging flange portion 21Tc, preventing the upper shoe 10T from floating up relative to the lower shoe 20T. However, because a vertical gap is formed between the top surface of the stopper 14T and the bottom surface of the overhanging flange portion 21Tc, some degree of floating is permitted.

[0088] When the sliding bearing device 1, which is composed of a lower shoe 20T having a surface treatment 23 with unevenness 24 formed on the upper surface 22a of the slide plate 22T and an upper shoe 10T, is vibrated, a friction coefficient history loop diagram such as that shown in Figure 8(d) is obtained. As shown in the first quadrant at the top right of the friction coefficient history loop diagram in Figure 8(d), when the sliding member 12T, which is arranged at the center of the slide plate 22T in a planar view, slides outward in the opposite direction Y, the friction coefficient μ gradually increases toward the friction coefficient μ1, and after sliding a predetermined distance in the opposite direction Y, the friction coefficient μ becomes μ1.

[0089] As the sliding continues in the counter-predetermined direction Y, the sliding stops near the outer edge, and the sliding continues in the predetermined direction X, where the friction coefficient μ2 is shown in the fourth quadrant at the bottom right of the friction coefficient history loop diagram in Figure 8(d). Then, as the sliding continues in the predetermined direction X for a predetermined distance and approaches the center in the plan view, the friction coefficient increases toward μ1.

[0090] Further, as the friction coefficient μ moves beyond the center of the plan view toward the opposite side, as shown in the third quadrant at the bottom left of the friction coefficient history loop diagram in Figure 8(d), the friction coefficient μ increases further toward the friction coefficient μ1, and after sliding a predetermined distance in the opposite direction Y, the friction coefficient μ becomes μ1.

[0091] As the friction coefficient continues to slide in the counter-predetermined direction Y, it stops near the outer edge and starts sliding in the predetermined direction X, where it slides at a friction coefficient μ2, as shown in the second quadrant at the top left of the friction coefficient history loop diagram in Figure 8(d). Then, as the friction coefficient continues to slide in the predetermined direction X for a predetermined distance and approaches the center in the plan view, it increases toward a friction coefficient μ1.

[0092] In this way, the one-way support device 1T consisting of the upper shoe 10T and the lower shoe 20T has the same effects as the sliding support devices 1, 1S described above, in addition to the fact that the slide plate 22T is formed wider than the sliding member 12T in the extension direction L in the in-plane direction, and the upper shoe 10 equipped with the sliding member 12T is provided with a base pot 13T that restricts sliding in the width direction W perpendicular to the extension direction L, so that the sliding properties of the one-way support device 1T, which can slide in one direction along the extension direction L, can be changed depending on the sliding direction.

[0093] Furthermore, since the surface treatment portion 23 is provided on the lower shoe sliding surface 20a of the slide plate 22T, the surface treatment portion 23 can be formed on the entire surface of the lower shoe sliding surface 20a of the slide plate 22T.

[0094] Furthermore, on the lower shoe sliding surface 20a of the slide plate 22T, surface treatment portions 23 are provided between an assembly position Z where the sliding member 12T is positioned in an assembled state in which the upper shoe 10 and the lower shoe 20 are assembled, and both end portions on both sides in the extension direction L, and the predetermined direction X is the direction in which the sliding member 12T slides relative to the slide plate 22T from the end toward the assembly position Z, and the counter-predetermined direction Y is the direction in which the sliding member 12T slides relative to the slide plate 22T from the assembly position Z toward the end. Therefore, the sliding member 12T can slide in the direction returning to the assembly position Z with an external force smaller than the external force acting when the sliding member 12T slides relative to the slide plate 22T from the assembly position Z toward either end.

[0095] Note that a one-way bearing device 1U having a different slide plate 22U may be used as shown in Fig. 9. Fig. 9 shows an explanatory diagram of another embodiment of a one-way bearing device 1U having a different slide plate 22T from the one-way bearing device 1T described above.

[0096] In detail, Figure 9(a) shows a plan view of slide plate 22U, Figure 9(b) shows a view taken along the arrow AA in Figure 9(a), Figure 9(c) shows an enlarged view of part b in Figure 9(b), Figure 9(d) shows an enlarged view of part b in Figure 9(b), and Figure 9(e) shows a friction coefficient history loop diagram of the displacement and friction coefficient of one-way support device 1U.

[0097] In the one-way bearing device 1T described above, the surface treatment portion 23 consisting of irregularities 24 is formed on the entire upper surface 22a of the slide plate 22T, but in the one-way bearing device 1U shown in Fig. 9, the surface treatment portion 23 is formed on only a part of the upper surface 22a of the slide plate 22U. Note that the configuration of the one-way bearing device 1U other than the slide plate 22U is the same as the configuration of the one-way bearing device 1T described above, so the same reference numerals are used and their explanation will be omitted.

[0098] The slide plate 22U of the lower shoe 20U in the one-way support device 1U does not have a surface treatment portion 23 formed on the upper surface 22a in the center of the extension direction L corresponding to the sliding member 12T at the assembly position Z, but only on the outside thereof. A circular portion on the upper surface 22a of the slide plate 22U, in the center in the extension direction L and corresponding to the sliding member 12T, where the surface treatment portion 23 is not formed, is defined as a general friction portion 25.

[0099] The general friction portion 25 is circular and has the same diameter as the bottom surface 12a, which is the sliding surface of the sliding member 12T, and has the general friction coefficient μ3 of the lower shoe 20U itself because it is not provided with the surface treatment portion 23. The general friction coefficient μ3 is a smaller friction coefficient than the friction coefficient μ2 of the surface treatment portion 23 for sliding in the predetermined direction X. The general friction portion 25 has a circular shape with the same diameter as the bottom surface of the sliding member 12T, but may also be a circle one size larger or one size smaller, or may be a polygonal shape such as an octagon.

[0100] The surface treatment portion 23 formed on the end side of the general friction portion 25 has irregularities 24 arranged in a radial direction, as shown in Figures 9(c) and (d), similar to the surface treatment portion 23 formed on the upper surface 22a of the slide plate 22 of the sliding bearing device 1.

[0101] When a one-way bearing device 1U consisting of a lower shoe 20 having a surface treatment 23 with unevenness 24 formed on the upper surface 22a of a slide plate 22U and an upper shoe 10 is vibrated, a friction coefficient history loop diagram such as that shown in Figure 9(e) is obtained.

[0102] As shown in the first quadrant at the top right of the friction coefficient history loop diagram in Figure 9(e), when the sliding member 12T, which is arranged in the center of the extension direction L of the slide plate 22U, slides in the counter-predetermined direction Y toward one end side, the friction coefficient μ gradually increases toward the friction coefficient μ1, and after sliding a predetermined distance in the counter-predetermined direction Y, the friction coefficient μ becomes μ1.

[0103] As the sliding continues in the counter-predetermined direction Y, the sliding stops near the end, and the sliding continues in the predetermined direction X, where the friction coefficient μ2 is shown in the fourth quadrant at the bottom right of the friction coefficient history loop diagram in Figure 9(e). Then, as the sliding continues in the predetermined direction X for a predetermined distance and approaches the center in the extension direction L, the friction coefficient decreases to μ3.

[0104] Further, when moving beyond the center of the extension direction L toward the other end of the extension direction L, which is the opposite side, the friction coefficient μ further increases toward the friction coefficient μ1, as shown in the third quadrant at the bottom left of the friction coefficient history loop diagram in Figure 9(e), and after sliding a predetermined distance in the opposite direction Y, the friction coefficient μ becomes μ1.

[0105] As the sliding continues in the counter-predetermined direction Y, the sliding stops near the end, and the sliding continues in the predetermined direction X, where the friction coefficient is μ2, as shown in the second quadrant at the top left of the friction coefficient history loop diagram in Figure 9(e). Then, as the sliding continues in the predetermined direction X for a predetermined distance and approaches the center in the extension direction L, the friction coefficient decreases to μ3.

[0106] In this way, the one-way bearing device 1U, which is composed of the upper shoe 10 and the lower shoe 20U having the slide plate 22U with the general friction portion 25 in the center of the extension direction L of the upper surface 22a and the surface treatment portion 23 formed on its end side, has the same effects as the sliding bearing devices 1, 1S and the one-way bearing device 1T described above, in addition to the effects achieved by the sliding bearing devices 1, 1S and the one-way bearing device 1T described above, the general friction portion 25, whose general friction coefficient μ3 is smaller than the friction coefficient of the surface treatment portion 23 and does not change depending on the sliding direction, is provided on the inside of the in-plane direction of the lower shoe sliding surface 20a of the slide plate 22U, and the surface treatment portion 23 is provided on the outside of the general friction portion 25 in the extension direction L, the predetermined direction X is the direction in which the sliding material 12T slides from the outside toward the general friction portion 25 relative to the slide plate 22U, and the anti-predetermined direction Y is the direction in which the sliding material 12T slides from the general friction portion 25 toward the outside relative to the slide plate 22U. Therefore, the sliding member 12T slides on the general friction portion 25 until a large external force acts on the slide plate 22U to slide the surface treated portion 23 toward the end, and when a large external force acts, the sliding member 12T slides the surface treated portion 23 toward the end. After the sliding member 12T has slid the surface treated portion 23 against the slide plate 22U, it can slide back from the end toward the assembly position Z with a small force.

[0107] Therefore, for example, when a small external force such as wind load or a medium-sized earthquake (LV1) that may occur once every few decades acts, the sliding material 12T slides against the sliding plate 22U via the general friction portion 25, and when a large external force such as a large-scale seismic movement such as a major earthquake (Level 2) that may occur once every few hundred years or an extremely large earthquake (Level 3) that may occur once every few thousand years acts, the sliding material 12T can slide against the sliding plate 22U via the surface treatment portion 23.

[0108] Furthermore, a one-way bearing device 1V having a different lower shoe 20V may be used as shown in Fig. 10. Fig. 10 shows an explanatory view of a one-way bearing device 1V of yet another embodiment in which the slide plate 22T is different from the one-way bearing device 1T described above.

[0109] In detail, Figure 10(a) shows a plan view of slide plate 22V, Figure 10(b) shows a view taken along the arrow AA in Figure 10(a), Figure 10(c) shows an enlarged view of part b in Figure 10(b), and Figure 10(d) shows a friction coefficient history loop diagram of the displacement and friction coefficient of one-way support device 1V.

[0110] In the one-way support device 1T described above, the surface treatment portion 23 consisting of irregularities 24 is formed on the entire upper surface 22a of the slide plate 22T, and the slide plate 22T is formed so that the lengths from the assembly position Z to the ends in both directions are equal, that is, the assembly position Z is the center in the extension direction L of the slide plate 22T, but the lower shoe 20V and slide plate 22V of the one-way support device 1V shown in Figure 10 are formed so that the length from the assembly position Z to the end on the side where the surface treatment portion 23 is formed is shorter than the length from the assembly position Z to the end on the side which is the general friction portion 25. In other words, the assembly position Z is shifted from the center in the extension direction L of the slide plate 22V to the side where the surface treatment portion 23 is formed.

[0111] This is because when an external force of the same magnitude is applied, the sliding distance over which the sliding material 12T slides on the surface treatment portion 23 in the anti-predetermined direction Y, which has a friction coefficient μ1, is shorter than the sliding distance over which the sliding material 12T slides on the general friction portion 25, which has a general friction coefficient μ3, so the length from the assembly position Z to the end is formed to a length that corresponds to each sliding range.

[0112] When a one-way bearing device 1V consisting of a lower shoe 20 having a surface treatment 23 with unevenness 24 formed on the upper surface 22a of a slide plate 22V and an upper shoe 10 is vibrated, a friction coefficient history loop diagram such as that shown in Figure 10(d) is obtained.

[0113] As shown in the first quadrant at the top right of the friction coefficient history loop diagram in Figure 10(d), when the sliding member 12T arranged at the assembly position Z on the slide plate 22V slides in the counter-predetermined direction Y toward the end on which the surface treatment portion 23 is formed, the friction coefficient μ gradually increases toward the friction coefficient μ1, and after sliding a predetermined distance in the counter-predetermined direction Y, the friction coefficient μ becomes μ1.

[0114] As the sliding continues in the counter-predetermined direction Y, it stops near the end and starts sliding in the predetermined direction X, where it slides with a friction coefficient of μ2, as shown in the fourth quadrant at the bottom right of the friction coefficient history loop diagram in Figure 10(d). Then, as the sliding continues in the predetermined direction X for a predetermined distance and approaches the assembly position Z, the friction coefficient decreases to the general friction coefficient μ3.

[0115] Further, as the friction coefficient μ moves beyond the assembly position Z toward the end on the opposite side, which is the general friction portion 25, the friction coefficient μ further decreases toward the general friction coefficient μ3, as shown in the third quadrant at the bottom left of the friction coefficient history loop diagram in FIG. 10(d), and after sliding a predetermined distance in the counter-predetermined direction Y, the friction coefficient μ reaches the general friction coefficient μ3.

[0116] The sliding continues in the counter-predetermined direction Y until it stops near the end and starts sliding in the predetermined direction X, where it continues to slide with a general friction coefficient μ3, as shown in the second quadrant at the top left of the friction coefficient history loop diagram in Figure 10(d). Then, after sliding a predetermined distance in the predetermined direction X and approaching the assembly position Z, the friction coefficient increases toward μ1.

[0117] In this way, the one-way support device 1V consisting of a lower shoe 20V having a slide plate 22V and an upper shoe 10T has a sliding distance (first and fourth quadrants) on the side where the surface treatment part 23 is formed from the assembly position Z that is shorter than the sliding distance (second and third quadrants) on the side where the general friction part 25 is formed.

[0118] As described above, the one-way bearing device 1V composed of the lower shoe 20V having the slide plate 22V and the upper shoe 10T has the same effects as the sliding bearing devices 1, 1S and one-way bearing device 1T described above, and in addition thereto, on the lower shoe sliding surface 20a of the slide plate 22V, a surface treatment portion 23 is provided between the assembly position Z where the slide member 12T is positioned in the assembled state where the upper shoe 10 and the lower shoe 20 are assembled, and one of the ends on both sides in the extension direction L, and between the assembly position Z and the other end there is provided a general friction portion 25 whose general friction coefficient μ3 which is smaller than the friction coefficient of the surface treatment portion 23 does not change depending on the sliding direction, the predetermined direction X is the direction in which the slide member 12T slides from the end toward the assembly position Z relative to the slide plate 22V, and the anti-predetermined direction Y is the direction in which the slide member 12T slides from the assembly position Z toward the end relative to the slide plate 22V.

[0119] Therefore, the sliding material 12T can be slid relative to the slide plate 22V in the direction from the assembly position Z toward the opposite end where the general friction portion 25 is provided with a smaller external force than the external force required when the sliding material 12T slides relative to the slide plate 22V in the direction from the assembly position Z toward the end where the surface treatment portion 23 is provided, and the sliding material 12T that has slid relative to the slide plate 22V from the assembly position Z toward the end where the surface treatment portion 23 is provided can be returned to the assembly position Z with a small external force.

[0120] Furthermore, since the length in the extension direction L between the assembly position Z and one end where the surface treatment portion 23 is provided is shorter than the length in the extension direction L between the assembly position Z and the other end where the general friction portion 25 is provided, the sliding distance of the sliding material 12T on the side where the surface treatment portion 23 is provided from the assembly position Z can be made shorter than the sliding distance of the sliding material 12T on the side where the general friction portion 25 is provided from the assembly position Z, and the sliding material 12T that has slid from the assembly position Z toward the end where the surface treatment portion 23 is provided relative to the slide plate 22V can be returned to the assembly position Z with a small external force.

[0121] That is, the sliding distance of the sliding member 12T on the side where the surface treatment portion 23 is provided can be made shorter than the range of movement of the sliding member 12T on the side where the general friction portion 25 is provided from the assembly position Z. This allows use in an environment where, for example, the range in which the sliding member 12T can move on one side from the assembly position Z must be narrowed.

[0122] As described above, in the configuration of the present invention and the correspondence between the configuration and the above-mentioned embodiment, the first structure and the upper structure of the present invention correspond to the upper structure 200, Similarly, The second structure, the lower structure, corresponds to the lower structure 300; The first shoe and upper shoe correspond to upper shoe 10, 10T, The second shoe and lower shoe correspond to the lower shoe 20, 20T. The sliding surfaces correspond to the upper shoe sliding surface 10a and the lower shoe sliding surface 20a. The sliding member corresponds to sliding member 12, 12T, The sliding plate material is compatible with slide plates 22, 22S, 22T, 22U, and 22V. The predetermined direction corresponds to the predetermined direction X, The friction coefficient for sliding in a given direction corresponds to the friction coefficient μ2, The counter-predetermined direction corresponds to the counter-predetermined direction Y, The friction coefficient for sliding in the opposite direction corresponds to the friction coefficient μ1, The anisotropic friction portion corresponds to the surface treatment portion 23, The bearing devices correspond to sliding bearing devices 1, 1S, one-way bearing devices 1T, 1U, 1V, The outside in the in-plane direction corresponds to the outside in plan view, The inside in the in-plane direction corresponds to the inside in plan view, The small friction coefficient corresponds to the general friction coefficient μ3, The general friction part corresponds to the general friction part 25, The perpendicular direction corresponds to the width direction W, The regulation part corresponds to the base pot 13T, The assembly position corresponds to assembly position Z, but is not limited to the above embodiment.

[0123] For example, in the above explanation, the sliding bearing device 1, 1S is a rigid sliding bearing in which the sliding material 12 is fixed to the base portion 11b of the sliding material holder 11 in the upper shoe 10, and the one-way bearing devices 1T, 1U, 1V are rigid sliding bearings in which the sliding material 12T is attached to the base pot 13T, but the upper shoe 10 and upper shoe 10T may also be elastic sliding bearings in which the sliding material 12 or sliding material 12T is attached to a piston with an elastic member interposed between the base portion 11b and the base pot 13T.

[0124] The above-mentioned superstructure 200 and substructure 300 may be, for example, a building in which the superstructure 200 is a building and the substructure 300 is a foundation structure, a bridge in which the substructure 300 is a bridge pier and the superstructure 200 is a main girder, a connecting passage in which the substructure 300 is a building and the superstructure 200 is a walkway connecting buildings, a roof structure in which the substructure 300 is a column and the superstructure 200 is a truss roof, or a structure in an expansion structure in which a building is the substructure 300 and another building is the superstructure 200. Alternatively, the structure may be a server in which the superstructure 200 is a rack.

[0125] The slide plates 22, 22S, 22T, 22U, and 22V, which are formed wider than the slide members 12 and 12T in all in-plane directions described above, can have any suitable planar shape, such as a circle, a polygon such as a hexagon, or an ellipse, when viewed in a plane. As long as the friction coefficient of the general friction portion 25 is smaller than the friction coefficient of the surface treatment portion 23 in the anti-predetermined direction Y, it may be the same as or different from the friction coefficient of the surface treatment portion 23 in the predetermined direction X. [Explanation of symbols]

[0126] 1, 1S, 1T, 1U, 1V...Sliding bearing device and one-way bearing device 10,10T…Upper shoe 10a...Upper shoe sliding surface 12,12T...Sliding material 13T...base spot 20,20S…Shimotsutsu 20a…Lower shoe sliding surface 20T, 20U, 20V...sole plate 22, 22S, 22T, 22U, 22V...Slide plate 23...Surface treatment section 25…General friction part 200...superstructure 300...Substructure X…Predetermined direction Y: Opposite direction W…Width direction Z…Assembly position

Claims

1. A bearing device comprising a first shoe and a second shoe disposed at opposing portions of a first structure and a second structure, wherein sliding surfaces at opposing portions of the first shoe and the second shoe slide against each other, a sliding member that constitutes the sliding surface is provided on one of the first shoe and the second shoe, a sliding plate member that forms the sliding surface on the other of the first shoe and the second shoe and is wider than the sliding member; At least a part of the sliding surface of at least one of the sliding plate material and the sliding member, An anisotropic friction portion is formed in which the friction coefficient for sliding in a predetermined direction is higher than the friction coefficient for sliding in the opposite direction to the predetermined direction. Bearing device.

2. The sliding plate is formed wider than the sliding member in all in-plane directions. The bearing device of claim 1 .

3. The anisotropic friction portion is provided on the sliding surface of the sliding plate, the predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the outside to the inside in the in-plane direction, The counter-predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the inside to the outside in the in-plane direction. The bearing device according to claim 2 .

4. a general friction portion having a friction coefficient that is smaller than that of the anisotropic friction portion and does not change depending on the sliding direction is provided on the inner side in the in-plane direction of the sliding surface of the sliding plate, and the anisotropic friction portion is provided on the outer side of the general friction portion; the predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the outside to the inside in the in-plane direction, The counter-predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the inside to the outside in the in-plane direction. The bearing device according to claim 2 .

5. The sliding plate is formed wider than the sliding member in the predetermined direction in the in-plane direction, One of the first shoe and the second shoe provided with the sliding member is provided with a restricting portion that restricts sliding in an orthogonal direction that is orthogonal to the predetermined direction. The bearing device of claim 1 .

6. the anisotropic friction portions are provided on the sliding surface of the sliding plate between an assembly position where the sliding member is disposed in an assembled state in which the first shoe and the second shoe are assembled, and both end portions on the predetermined direction; the predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the end toward the assembly position, The counter-predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the assembly position toward the end.

6. The bearing device according to claim 5.

7. On the sliding surface of the sliding plate, the anisotropic friction portion is provided between an assembly position where the sliding member is disposed in an assembled state in which the first shoe and the second shoe are assembled, and one of the end portions on both sides in the predetermined direction, a general friction portion having a friction coefficient that is smaller than the friction coefficient of the anisotropic friction portion and does not change depending on the sliding direction is provided between the assembly position and the other end portion; the predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the end toward the assembly position, The counter-predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the assembly position toward the end.

6. The bearing device according to claim 5.

8. a general friction portion having a friction coefficient that is smaller than that of the anisotropic friction portion and does not change depending on the sliding direction is provided on the inner side in the in-plane direction of the sliding surface of the sliding plate, and the anisotropic friction portion is provided on the outer side of the general friction portion in the predetermined direction; the predetermined direction is a direction in which the sliding member slides relative to the sliding plate from the outside toward the general friction portion, The counter-predetermined direction is the direction in which the sliding member slides against the sliding plate from the general friction portion toward the outside.

6. The bearing device according to claim 5.

9. The sliding member is Made of filled resin with filler mixed in A bearing device according to any one of claims 1 to 8.

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