Support device

Abstract

To provide a bearing device capable of supporting a high load with a more compact design.SOLUTION: A slide bearing 1 comprises: a flange 10 arranged on the upper structure 2 side of a structure such as a building or a bridge; a bearing plate 11 arranged on the lower structure 3 side opposite to the flange 10; an elastic body 12 fixed to the flange 10 and the bearing plate 11 and interposed between the flange 10 and the bearing plate 11; and a disk-like shearing key 13 restraining shearing deformation of the elastic body 12. The shearing key 13 is housed in a housing part 100 where one end part 130 is formed on a lower surface 101 of the flange 10, and another end part 131 is housed in a housing part 110 formed on an upper surface 111 of the bearing plate 11. A shaft center O is arranged in the elastic body 12 so as to be inclined (rotated) with respect to a stacking direction V of the flange 10 and the bearing plate 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bearing device used as a seismic isolation device for structures such as buildings and bridges. [Background technology]

[0002] As a seismic isolation device for structures such as buildings and bridges, a bearing device is known that is placed between the superstructure and substructure of the structure and supports the superstructure while suppressing the transmission of vibrations of the substructure due to earthquakes, etc. to the superstructure.

[0003] For example, Patent Document 1 discloses a bearing device that does not have steel plate layers alternately laminated with elastic layers, making it compact overall and capable of supporting a high load in a small area. This bearing device includes an upper plate (first rigid body) with a through hole drilled therein, a lower plate (second rigid body) arranged opposite the upper plate, an elastic body arranged between the upper and lower plates, a shear key (core material) that is fixed to the lower plate by screwing or the like and passes through the elastic body with its tip located within the through hole, and a filler material that contacts the tip of the shear key and fills the inside of the through hole.

[0004] According to the bearing device described in Patent Document 1, vibrations transmitted from the substructure of a structure to the lower plate are absorbed by the elastic body through shear deformation, thereby preventing the vibrations from being transmitted to the superstructure of the building via the upper plate. In addition, the tip of the shear key fixed to the lower plate is positioned inside the through-hole provided in the upper plate, thereby preventing excessive relative horizontal movement between the upper and lower plates, thereby preventing the elastic body from being destroyed by excessive shear deformation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5646383 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, there has been a demand for further compactness of bearing devices. However, in the bearing device described in Patent Document 1, the shear key is fixed to the lower plate by screwing or the like, and the constraint of shear deformation of the elastic body depends on the overlap amount between the through hole provided in the upper plate and the tip of the shear key located in this through hole. Therefore, in order to reliably constraint the shear deformation of the elastic body, it is necessary to increase this overlap amount or to provide a mechanism to prevent the tip of the shear key from slipping out of the through hole provided in the upper plate, which makes it impossible to reduce the height of the bearing device.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bearing device that is capable of supporting a high load with a more compact design. [Means for solving the problem]

[0008] In order to solve the above problem, in the support device of the present invention, one end of a disk-shaped shear key is accommodated in a receiving portion formed on the surface of the upper plate facing the lower plate, and the other end is accommodated in a receiving portion formed on the surface of the lower plate facing the upper plate, and the shear key is arranged within an elastic body interposed between the upper plate and the lower plate so that the axis of the shear key can be tilted relative to the stacking direction of the upper plate and the lower plate.

[0009] For example, the bearing device of the present invention may A bearing device disposed between an upper structure and a lower structure of a structure, the bearing device supporting the upper structure while suppressing transmission of vibrations of the lower structure to the upper structure, an upper plate disposed on the upper structure side; a lower plate disposed on the lower structure side facing the upper plate; an elastic body fixed to the upper plate and the lower plate and interposed between the upper plate and the lower plate; Restraining the shear deformation of the elastic body , having a constant diameter in the axial direction a disc-shaped shear key; a sliding plate attached to a surface of the lower plate facing the lower structure or a surface of the upper plate facing the upper structure, the sliding plate having a sliding surface; Equipped with The upper plate is a shear key formed on a surface facing the lower plate and adapted to receive one end of the shear key; , a cylindrical shape with a bottom and a constant diameter in the axial direction A first storage section is provided. The lower plate is a shear key formed on the surface facing the upper plate and adapted to receive the other end of the shear key; , a cylindrical shape with a bottom and a constant diameter in the axial direction A second storage section is provided. The shear key is the one end is accommodated in the first accommodation portion of the upper plate, and the other end is accommodated in the second accommodation portion of the lower plate, and the elastic body is disposed therein; The thickness and diameter of the shear key are set relative to the diameters of the first receiving portion and the second receiving portion so that the axis of the shear key can be inclined up to 7 degrees with respect to the stacking direction of the upper plate and the lower plate. And, The elastic body is A thickness T1 between a surface of the upper plate facing the lower plate other than the first accommodating portion and a surface of the lower plate facing the upper plate other than the second accommodating portion is 1 / 30 of a diameter D3 of the sliding plate. . [Effects of the Invention]

[0010] In the present invention, due to shear deformation of the elastic body caused by relative horizontal movement between the upper plate and the lower plate, one end of the shear key housed in the housing of the upper plate is pushed in the direction of movement of the upper plate, and the other end of the shear key housed in the housing of the lower plate is pushed in the direction of movement of the lower plate, which is opposite to the direction of movement of the upper plate, causing the shear key to rotate so that its axis is inclined relative to the stacking direction of the upper and lower plates. This increases the overlap between one end of the shear key and the housing of the upper plate, and the overlap between the other end of the shear key and the housing of the lower plate, respectively, thereby constraining shear deformation of the elastic body even when the height of the shear key is reduced. Furthermore, in addition to constraining shear deformation of the elastic body, the shear key can support vertical loads applied between the upper plate and the lower plate. Therefore, the present invention provides a bearing device capable of supporting high loads with a more compact design. [Brief explanation of the drawings]

[0011] [Figure 1] 1(A) and 1(B) are a plan view and a bottom view of a sliding bearing 1 according to one embodiment of the present invention, and FIG. 1(C) is a cross-sectional view of the sliding bearing 1 shown in FIG. 1(A) taken along line AA. [Figure 2] 2(A) to 2(C) are diagrams for explaining the operation of the sliding bearing 1 shown in FIG. [Figure 3] Figure 3(A) is a diagram equivalent to Figure 1(C) for explaining variant 1A of the sliding bearing 1 according to one embodiment of the present invention, and Figure 3(B) is a diagram equivalent to Figure 1(C) for explaining variant 1B of the sliding bearing 1 according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described below.

[0013] 1(A) and 1(B) are a plan view and a bottom view of a sliding bearing 1 according to one embodiment of the present invention, and FIG. 1(C) is a cross-sectional view of the sliding bearing 1 shown in FIG. 1(A) taken along line AA.

[0014] The sliding bearing 1 of this embodiment is placed between the superstructure and substructure of a structure such as a building or bridge, and supports the superstructure while suppressing the transmission of vibrations from the substructure due to earthquakes, etc. to the superstructure.

[0015] As shown in the figure, the sliding bearing 1 of this embodiment comprises a flange 10, a support plate 11 arranged opposite the flange 10, an elastic body 12 interposed between the flange 10 and the support plate 11, a shear key 13 that restrains the shear deformation of the elastic body 12, and a sliding plate 14 attached to the underside 112 of the support plate 11 (the surface facing the substructure of the structure).

[0016] The flange 10 is a plate-like member that functions as an upper plate placed on the superstructure side of the structure, and is fixed to the superstructure by bolts (not shown) inserted into bolt holes 102. A cylindrical receiving portion 100 with a bottom is formed on the underside 101 of the flange 10 (the surface facing the support plate 11) to receive one end 130 of the shear key 13. The flange 10 is made of metals including steel materials such as SS400, ceramics, hard resins, reinforced plastics, or composite materials of these.

[0017] The support plate 11 is a disc-shaped member that functions as a lower plate disposed on the substructure side of the structure. A cylindrical bottomed receiving section 110 for receiving the other end 131 of the shear key 13 is formed on the upper surface 111 (the surface facing the flange 10) of the support plate 11. The receiving section 110 has approximately the same diameter as the receiving section 100 of the flange 10 and faces the receiving section 100. A mounting recess 113 for mounting the sliding plate 14 is formed on the lower surface 112 of the support plate 11. Like the flange 10, the support plate 11 is made of metals, including steel materials such as SS400, ceramics, hard resins, reinforced plastics, or composite materials thereof. The support plate 11 is covered with an elastic body 12, except for the mounting recess 113 where the sliding plate 14 is mounted.

[0018] The elastic body 12 is fixed to the lower surface 101 of the flange 10 and the upper surface 111 of the support plate 11 by vulcanization bonding or the like, and is interposed between the flange 10 and the support plate 11. As a result, it undergoes shear deformation due to relative movement between the flange 10 and the support plate 11, and suppresses the transmission of vibrations of the support plate 11 to the flange 10. The elastic body 12 is made of natural rubber, synthetic rubber, thermoplastic elastomer, or thermosetting elastomer.

[0019] Furthermore, the thickness T1 of the elastic body 12 between the lower surface 101 of the flange 10 and the upper surface 111 of the support plate 11, the thickness T2 between one end 130 of the shear key 13 and the ceiling 103 of the housing 100, and the thickness T3 between the other end 131 of the shear key 13 and the bottom surface 114 of the housing 110 are preferably set so that T1≦T2+T3, and more preferably so that T3=T1 / 2 and T2≧T3. By satisfying T1≦T2+T3, the elastic body 12 is more susceptible to elastic deformation in the center of the sliding bearing 1, reducing its compressive rigidity. This alleviates the concentration of compressive stress in the elastic body 12 in the center of the sliding bearing 1 in response to a compressive load in the vertical direction V (the stacking direction of the flange 10 and the support plate 11), allowing for smoother tilting (rotation) of the shear key 13 relative to the vertical direction V, as described below. Furthermore, by making T3 = T1 / 2 and T2 ≧ T3, the thickness of the elastic body 12 can be sufficiently secured between one end 130 of the shear key 13 and the ceiling 103 of the accommodating portion 100 of the flange 10, making it possible to make the accommodating portion 110 of the support plate 11 shallower, thereby enabling a more compact design of the sliding bearing 1.

[0020] The outer peripheral surface 120 of the elastic body 12 between the flange 10 and the support plate 11 is formed to have a cross-sectional concave shape recessed toward the inner diameter side.

[0021] The shear key 13 is a disk-shaped member having a smaller diameter than the accommodating portion 100 of the flange 10 and the accommodating portion 110 of the support plate, and is disposed within the elastic body 12 such that one end 130 is accommodated in the accommodating portion 100 of the flange 10 and the other end 131 is accommodated in the accommodating portion 110 of the support plate 11. By accommodating both ends 130, 131 of the shear key 13 within the accommodating portion 100 of the flange 10 and the accommodating portion 110 of the support plate 11 via the elastic body 12, the relative movement between the flange 10 and the support plate 11 is restricted, and shear deformation of the elastic body 12 is restrained. Furthermore, the shear key 13 is disposed within the cylindrical space defined by the accommodating portion 100 of the flange 10 and the accommodating portion 110 of the support plate 11 so as to be tiltable (rotatable) with respect to the vertical direction V.

[0022] It is preferable that the corners 134 of the shear key 13 are chamfered. This avoids stress concentration at the corners 134 of the shear key 13, making it easier to tilt (rotate) the shear key 13.

[0023] The sliding plate 14 is a disk-shaped member having a sliding surface 140 that slides against a support surface (for example, the surface of a stainless steel plate) provided on the lower structure of the structure, and is attached to the mounting recess 113 of the support plate 11 so that the sliding surface 140 protrudes downward from the lower surface 112 of the support plate 11. When the shear force of the elastic body 12 that has been shear-deformed by the relative movement between the flange 10 and the support plate 11 exceeds the static friction force between the sliding surface 140 of the sliding plate 14 and the support surface provided on the lower structure of the structure, slippage occurs between the sliding surface 140 and this support surface.

[0024] Here, for example, the thickness T1 of the elastic body 12 between the lower surface 101 of the flange 10 and the upper surface 111 of the support plate 11 is board When T1 is larger than D3 / 30, the amount of sinking of the sliding bearing 1 becomes excessive. On the other hand, when T1 is smaller than D3 / 30, it becomes difficult for the sliding bearing 1 to tilt, and the sliding resistance during tilting increases. board This causes an imbalance in the distribution of bearing pressure acting on 14.

[0025] For example, the diameter D1 of the receiving portion 100 of the flange 10 and the receiving portion 110 of the support plate 11 is board If the diameter D3 of 14 is 700 mm, it is set to 284 mm, and the slip board If the diameter D3 of 14 is 200 mm, it is set to 56 mm.

[0026] Next, the operation of the sliding bearing 1 will be described.

[0027] 2(A) to 2(C) are diagrams for explaining the operation of the sliding bearing 1 shown in FIG.

[0028] As shown in Figure 2(A), the sliding bearing 1 has a flange 10 fixed to the superstructure 2 of the structure by bolts not shown, and the support plate 11 is placed on the substructure 3 so that the sliding surface 140 of the sliding plate 14 contacts the support surface 30 provided on the substructure 3 of the structure, thereby supporting the superstructure 2 of the structure.

[0029] In the sliding bearing 1 shown in Figure 2(A), when vibrations of the substructure 3 of the structure due to an earthquake or the like are transmitted to the bearing plate 11 via the sliding plate 14, the relative movement between the flange 10 and the bearing plate 11 causes shear deformation of the elastic body 12, thereby suppressing the transmission of the vibrations of the bearing plate 11 to the flange 10. At this time, as shown in Figure 2(B), one end 130 of the shear key 13 housed in the housing 100 of the flange 10 is pressed in the movement direction -F of the flange 10, and the other end 131 of the shear key 13 housed in the housing 110 of the bearing plate 11 is pressed in the movement direction +F of the bearing plate 11, which is the opposite direction to the movement direction -F of the flange 10, causing the shear key 13 to rotate so that the axis O of the shear key 13 is inclined with respect to the vertical direction V (the stacking direction of the flange 10 and the bearing plate 11). This increases the overlap amount P1 between one end 130 of the shear key 13 and the accommodating portion 100 of the flange 10, and the overlap amount P2 between the other end 131 of the shear key 13 and the accommodating portion 110 of the support plate 11, thereby more reliably restraining the shear deformation of the elastic body 12.

[0030] The size and position of the shear key 13 are set so as to ensure the overlap amounts P1 and P2 required to reliably restrain the shear deformation of the elastic body 12 when the axis O of the shear key 13 is tilted (rotated) with respect to the vertical direction V. When the diameter D2 and thickness T4 of the shear key 13 are large, the required overlap amounts P1 and P2 can be ensured even if the tilt angle of the axis O of the shear key 13 with respect to the vertical direction V is small. However, when the diameter D2 and thickness T4 of the shear key 13 are small, the tilt angle of the axis O of the shear key 13 with respect to the vertical direction V must be increased to ensure the overlap amounts P1 and P2.

[0031] For example, if the diameter D1 of the housing portion 100 of the flange 10 and the housing portion 110 of the support plate 11 is 284 mm, setting the diameter D2 and thickness T4 of the shear key 13 to 260 mm and 59.5 mm, respectively, will allow the axis O of the shear key 13 to rotate by a maximum of approximately 5 degrees relative to the vertical direction V, thereby ensuring the overlap amounts P1 and P2 necessary to reliably restrain the shear deformation of the elastic body 12 when the shear key 13 rotates. Also, if the diameter D1 of the housing portion 100 of the flange 10 and the housing portion 110 of the support plate 11 is 56 mm, setting the diameter D2 and thickness T4 of the shear key 13 to 50 mm and 26.5 mm, respectively, will allow the axis O of the shear key 13 to rotate by a maximum of approximately 7 degrees relative to the vertical direction V, thereby ensuring the overlap amounts P1 and P2 necessary to reliably restrain the shear deformation of the elastic body 12 when the shear key 13 rotates.

[0032] Here, when the shear force of the elastic body 12 that has been shear-deformed due to the relative movement between the flange 10 and the bearing plate 11 exceeds the static friction force between the sliding surface 140 of the sliding plate 14 and the support surface 30 provided on the substructure 3 of the structure, slippage occurs between the sliding surface 140 and this support surface 30, as shown in Figure 2(C). This suppresses the transmission of vibrations from the substructure 3 to the sliding bearing 1.

[0033] One embodiment of the present invention has been described above.

[0034] In this embodiment, the shear deformation of the elastic body 12 due to the relative movement between the flange 10 and the support plate 11 causes the shear key 13 to rotate so that the axis O of the shear key 13 is inclined with respect to the vertical direction V. This increases the overlap amount P1 between one end 130 of the shear key 13 and the housing portion 100 of the flange 10, and the overlap amount P2 between the other end 131 of the shear key 13 and the housing portion 110 of the support plate 11, so that the shear deformation of the elastic body 12 can be restrained even if the height of the shear key 13 is reduced. Therefore, this embodiment allows a more compact design to support a high load.

[0035] In addition, in this embodiment, a mounting recess 113 is provided on the underside 112 of the support plate 11, the sliding surface 140 protrudes from the underside 112 of the support plate 11, and the sliding plate 14 is mounted in this mounting recess 113. Therefore, when the shear force of the elastic body 12 that has been shear-deformed due to the relative movement between the flange 10 and the support plate 11 exceeds the static friction force between the sliding surface 140 and the mounting surface 30 provided on the substructure 3 of the structure, slippage occurs between the sliding surface 140 and this mounting surface 30, making it possible to suppress the transmission of vibrations of the substructure 3 to the sliding bearing 1.

[0036] In addition, in this embodiment, the support plate 11 is covered with the elastic body 12 except for the mounting recess 113 where the sliding plate 14 is mounted, so that the anti-rust effect of the support plate 11 can be expected even without applying a separate anti-rust treatment to the support plate 11.

[0037] In this embodiment, the housing portion 100 of the flange 10 and the housing portion 110 of the support plate 11 are each formed in a cylindrical shape with a bottom. Therefore, compared to when these housing portions 100, 110 are through holes, the compressive stress of the elastic body 12 is prevented from escaping to the outside through the through holes, and this compressive stress can be applied more efficiently to the shear key 13. This makes it possible to more reliably restrain the shear deformation of the elastic body 12.

[0038] Furthermore, in this embodiment, the outer peripheral surface 120 of the elastic body 12 between the flange 10 and the bearing plate 11 is formed with a cross-section that is recessed inward. This prevents the outer peripheral surface 120 of the elastic body 12 from expanding and increasing its surface area when the sliding bearing 1 is subjected to a compressive load in the vertical direction V, thereby preventing ozone cracks from occurring in the elastic body 12. Note that the outer peripheral surface 120 of the elastic body 12 only needs to be formed with a cross-section that is recessed inward so that the cross-section is flat or slightly recessed inward after the sliding bearing 1 is installed in a structure.

[0039] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0040] For example, as in modified example 1A of the sliding bearing 1 shown in Figure 3(A), the end faces 132, 133 of both end portions 130, 131 of the shear key 13 may be formed into a concave shape with the axis O of the shear key 13 as the apex. By doing so, the elastic body 12 in the center of the flange 10 and the support plate 11 becomes thicker, and the compressive stress of the elastic body 12 in this center portion can be reduced. This alleviates the uneven distribution of the compressive stress of the elastic body 12 acting on the sliding plate 14 via the support plate 11, and achieves good sliding performance of the sliding plate 14.

[0041] Although both end faces 132, 133 of both end portions 130, 131 of the shear key 13 are formed concavely here, it is sufficient that at least one of them is formed concavely.

[0042] Furthermore, as in modified example 1B of sliding bearing 1 shown in Figure 3(B), the ceiling 103 of the housing portion 100 of flange 10 and the bottom surface 114 of the housing portion 110 of support plate 11 may be formed into a concave shape with their central portions as apexes. Even in this case, as in modified example 1A shown in Figure 3(A), the elastic body 12 in the central portions of flange 10 and support plate 11 becomes thicker, and the compressive stress of elastic body 12 in this central portion can be reduced. This alleviates the uneven distribution of the compressive stress of elastic body 12 acting on sliding plate 14 via support plate 11, and achieves good sliding performance of sliding plate 14.

[0043] Here, both the ceiling 103 of the housing portion 100 of the flange 10 and the bottom surface 114 of the housing portion 110 of the support plate 11 are formed concavely, but it is sufficient if at least one of them is formed concavely.

[0044] Furthermore, in the above embodiment, the sliding bearing 1 is installed on the structure by fixing the flange 10 to the superstructure 2 of the structure and bringing the sliding plate 14 into contact with the support surface 30 provided on the substructure 3 of the structure. However, the present invention is not limited to this. The sliding plate 14 may be brought into contact with a flat surface provided on the superstructure 2 of the structure and the flange 10 may be fixed to the substructure 3 of the structure, that is, the sliding bearing 1 may be installed upside down on the structure.

[0045] Furthermore, in the above embodiment, the sliding bearing 1 in which the sliding plate 14 is attached to the underside 112 of the support plate 11 has been described as an example, but the present invention is not limited to this. The present invention is also applicable to a bearing device of a type in which the sliding plate 14 is not attached to the underside 112 of the support plate 11, and the support plate 11 is fixed to the substructure 3 of the structure. [Explanation of symbols]

[0046] 1, 1A, 1B: Sliding bearing 2: Upper structure of the structure 3: Lower structure of the structure 10: Flange 11: Support plate 12: Elastic body 13: Shear key 14: Slide plate 30: Placement surface 100: Receiving portion of flange 10 101: Lower surface of flange 10 102: Bolt holes of flange 10; 103: Ceiling of accommodation section 100 110: Housing portion for support plate 11 111: Upper surface of support plate 11 112: Lower surface of support plate 11; 113: Recessed portion for mounting support plate 11 114: Bottom surface of the storage section 110 120: Outer circumferential surface of the elastic body 12 130, 131: Ends of shear key 13 132, 133: End face of shear key 13 134: Corner of shear key 13 140: Sliding surface of slide plate 14

Claims

1. A bearing device disposed between an upper structure and a lower structure of a structure, the bearing device supporting the upper structure while suppressing transmission of vibrations of the lower structure to the upper structure, an upper plate disposed on the upper structure side; a lower plate disposed on the lower structure side facing the upper plate; an elastic body fixed to the upper plate and the lower plate and interposed between the upper plate and the lower plate; a disk-shaped shear key having a constant diameter in the axial direction, which restrains shear deformation of the elastic body; a sliding plate attached to a surface of the lower plate facing the lower structure or a surface of the upper plate facing the upper structure, the sliding plate having a sliding surface; The upper plate is a first receiving portion having a cylindrical shape with a bottom and a constant diameter in the axial direction, the first receiving portion being formed on a surface facing the lower plate and configured to receive one end of the shear key; The lower plate is a second receiving portion having a cylindrical shape with a bottom and a constant diameter in the axial direction, the second receiving portion being formed on a surface facing the upper plate and receiving the other end of the shear key; The shear key is the one end is accommodated in the first accommodation portion of the upper plate, and the other end is accommodated in the second accommodation portion of the lower plate, and the elastic body is disposed within the elastic body; a thickness and a diameter of the shear key are set relative to diameters of the first receiving portion and the second receiving portion so that an axis of the shear key can be inclined up to 7 degrees with respect to a stacking direction of the upper plate and the lower plate; The elastic body is A thickness T1 between a surface of the upper plate other than the first accommodating portion facing the lower plate and a surface of the lower plate other than the second accommodating portion facing the upper plate is 1 / 30 of a diameter D3 of the sliding plate. A bearing device characterized by:

2. 2. The bearing device according to claim 1, The shear key is a recess formed on at least one of the surface facing the upper plate and the surface facing the lower plate, the recess having an apex at the axis; A bearing device characterized by:

3. 3. The bearing device according to claim 1 or 2, At least one of the first storage section and the second storage section is It has a bottom surface with a recess formed in it, with the center at the top. A bearing device characterized by:

4. A bearing device according to any one of claims 1 to 3, The lower plate is a mounting recess provided on a surface of the lower structure side for mounting the sliding plate; The sliding plate is The sliding surface is protruded from the surface of the lower plate on the lower structure side and is attached to the attachment recess. A bearing device characterized by:

5. A bearing device according to any one of claims 1 to 4, The lower plate is The surface except for the mounting surface of the sliding plate is covered with the elastic body. A bearing device characterized by:

6. A bearing device according to any one of claims 1 to 5, The elastic body is When no vertical compressive load is applied, the outer peripheral surface between the upper plate and the lower plate is formed with a cross-sectional concave shape recessed toward the inner diameter side. A bearing device characterized by:

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