JP2536251Y2 - Spherical bearing - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention [Industrial application field] This invention is interposed between the upper structure such as a building and the lower structure such as a base. The present invention relates to a so-called spherical bearing that reduces shaking.

[Conventional technology]

As an example of this kind of spherical bearing, Japanese Patent Publication No. 43-25114 is known.

According to the known technique, a support member arranged on the upper structure side and a base arranged on the base side, the upper surface of the base is formed into a concave spherical shape, and a plurality of spheres are arranged on the upper surface, A configuration in which a `` sled member '' having the same curvature surface as the upper surface of the base and having a bowl-shaped support member on the top is superimposed on a sphere, and a spherical body is interposed between the sled member and the support member. take.

However, with this configuration, even if the base moves back and forth and left and right due to the occurrence of an earthquake, the sled member slides on the sphere, and the movement of the base is not transmitted to the support member fixed to the ground part, and as a result, This has the effect of not transmitting the downward horizontal movement to the ground floor of the object.

However, according to the known technique, since the sphere is arranged only within the range of the lower surface of the sled member, when the sled member moves on the sphere with the relative movement between the sled member and the base,
A region where no sphere exists is generated on the lower surface of the sled member. In addition, the displacement of the seismic motion occurs in any direction in the horizontal direction, and the sled member also moves in any direction, and when this defect area occurs, there is no guarantee that it will return to a stable state and it is agile There is a problem that operation is lost and a desired function cannot be achieved.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances, and an object of this type of spherical bearing is to provide a spherical bearing that can always slide on a sphere without generating a sphere lacking region and exhibit a desired action. Is what you do.

B. Configuration of the Invention [Means for Solving the Problems] The spherical bearing of the present invention employs the following technical means (configuration) to achieve the above object.

A lower shoe having a spherical seat formed on a concave spherical surface fixed to the lower structure and having a large radius of curvature large enough to obtain a long period upward; and A bearing formed of a convex sphere having a radius of curvature concentric with the concave sphere; and disposing the bearing with a horizontal movement area with respect to the lower shoe, with the concave and convex spherical faces facing each other. Then, a plurality of spherical rolling elements having the same diameter are interposed between these spherical surfaces, and the bearing body transmits the load of the upper structure to the lower shoe via the rolling elements to the curved surface of the spherical surface. In a spherical bearing that performs oscillating motion, the rolling element extends to the outside of the convex spherical surface of the bearing body, and is at least 1 / th of a maximum oscillating movement distance of the bearing body.
It is arranged in the spherical seat within a range not less than 2.

[Action]

When the substructure vibrates horizontally due to the earthquake, the bearing body mounted on the rolling element rolls on the rolling element and does not follow the displacement of the substructure.

The rolling element is disposed within the rolling range of the bearing, the bearing always moves on the rolling element, and the rolling element on the lower surface of the bearing is maintained in a single-layer state.

In this way, the bearing body maintains its load carrying capacity to a maximum and the rolling resistance is kept to a minimum.

〔Example〕

An embodiment of the spherical bearing of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show one embodiment (first embodiment). That is, FIG. 1 shows a vertical cross-sectional structure of the spherical bearing of this embodiment, and FIG. 2 shows a horizontal cross-sectional structure.

In the drawing, B is a lower structure such as a base, G is an upper structure such as a building, and the spherical bearing S is interposed between the lower structure B and the upper structure G. Is transmitted to the lower structure B, and a relative displacement in the horizontal direction between the two is allowed.

For this purpose, the spherical bearing S has a lower shoe 1 mounted and fixed on the lower structure B and an upper shoe 2 fixed on the lower surface of the upper structure G.
And a bearing body 3 interposed between the lower shoe 1 and the upper shoe 2
In particular, in the present embodiment, a configuration including a skirt member 5 is adopted.

 Hereinafter, the configuration of each unit will be described in detail.

The lower shoe 1 has a columnar body as a base and is fixedly fastened by fastening nuts 8 to anchor bolts 7 buried in the lower structure B through anchor bolt insertion holes 1a formed at four lower corners thereof.

A spherical seat 9 having a predetermined radius of curvature R is recessed from the upper surface of the lower shoe 1. The radius of curvature R is long enough to obtain a long-period vibration. 10 is a stopper wall surface.

The upper shoe 2 consists of a cylindrical body having a downwardly convex spherical surface 12,
A flange 13 projecting outward is protruded from the upper end thereof,
It is fixed to the upper structure G by bolt and nut fastening means through a bolt insertion hole formed in the flange 13.

The support body 3 has a cylindrical shape, and the upper surface has a spherical surface of the upper shoe 2.
A spherical concave surface 15 for receiving 12 with the same radius of curvature is provided so that the upper shoe 2 and the support body 3 can be swung freely.

In addition, a spherical portion 16 having a radius of curvature concentric with the spherical seat 9 of the lower shoe 1 is formed on the lower surface of the support body 3. Therefore, the spherical seat 9 and the spherical portion 16 are concentric in the stationary state. The support body 3 is arranged with a horizontal movement area with respect to the lower shoe 1.

A large number of small-diameter spheres having the same diameter are used as the rolling elements 4. The rolling elements 4 are arranged on the spherical seat 9 in a single layer state with a predetermined spread.

The skirt member 5 compensates for the spread of the rolling element 4 described above, and is fixed to the side surface of the support body 3 by an appropriate fixing means. The lower surface of the skirt member 5 is parallel to the curvature of the spherical seat 9 and is in contact with the rolling element 4 or is arranged with a slight gap between the rolling element 4 and the rolling element 4. The gap is made smaller than the diameter of the rolling element 4.

In the above members, lower shoe 1, upper shoe 2, support member 3,
The rolling element 4 withstands the load of the upper structure G and is made of a rigid body. The skirt member 5 does not necessarily need to be rigid.

In this embodiment, it should be particularly noted that the rolling element 4 is disposed, and the rolling element 4 is a spherical portion on the lower surface of the support 3.
Of course, 16 is arranged so as to protrude to the outside thereof, and is arranged in a single-layer state over at least half of the maximum swinging range of the support body 3, that is, the design swinging range. Things.

That is, the bearing body 3 rolls on the rolling element 4 along the spherical seat 9 of the lower shoe 1 and freely swings in any horizontal direction. It is sufficient that the arrangement range H of the protrusion from the spherical portion 16 is at least half of the rolling distance I of the support 3. Therefore, the outer diameter of the skirt member 5 is set to a size that covers the rolling distance I.

In the present invention, the disposition range of the rolling element 4 does not exclude the maximum swing range, but the maximum swing range is in consideration of the safety factor. 1/2 is enough. That is, even if the bearing body receives the earthquake motion reaching the maximum swing range, the bearing body receives a large return force when it moves to the maximum swing range, and immediately starts the return movement. Further, at this time, most of the lower surface of the bearing body is mounted on the rolling element, and the missing portion is slight.

The spherical bearing of this embodiment configured as described above operates as follows with respect to the relative displacement between the upper structure G and the lower structure B caused by seismic motion or the like.

When the substructure B vibrates horizontally due to the seismic motion, the bearing body 3 placed on the rolling element 4 and located at the stable position of the spherical seat 9 (that is, the lowest point at the center) rolls on the rolling element 4. Instead of following the displacement, the robot will crawl along the curved surface of the spherical seat 9. At this time, the upper shoe 2 and the support 3 are curved
The upper shoe 2 and the upper structure G are always parallel to the lower structure B because the upper structure G and the upper structure G are bendable via the holes 12 and 15, and the upper structure G does not tilt.

Horizontal vibration due to the seismic motion occurs in any direction, and the bearing body 3 also crawls along the curved surface of the spherical seat 9 in any direction, thereby absorbing the horizontal vibration in a non-directional manner.

At this time, the skirt member 5 always keeps the rolling elements 4 in a single-layer state, in other words, prevents the rolling elements 4 from overlapping.
The lower surface of the bearing body 3, that is, the spherical portion 16, is always in contact with the rolling element 4, so that the load bearing capacity is maintained at a maximum and the rolling resistance is maintained at a minimum.

Since the bearing body 3 has a relatively long natural frequency determined by the radius of curvature R of the spherical seat 9 of the lower shoe 1, the natural frequency of the vibration generated by the earthquake is short from this natural frequency range. By shifting the frequency, resonance is prevented. When the vibration of the foundation ends, the bearing 3 and the rolling element 4 return to the lowest point of the spherical seat 9.

(Other Embodiment) FIG. 3 shows another embodiment (second embodiment) of the present invention.
In the figure, the same reference numerals are given to members equivalent to those in the previous embodiment.

In this embodiment, another mode is shown in which a member for holding the rolling element 4 in a single-layer state as in the first embodiment is not used.

That is, the rolling elements 4 are stacked in multiple layers around the bearing body 3 and are filled in the gap so that the rolling elements 4 do not run short in the swing range of the bearing body 3. . In the figure, reference numeral 18 denotes a magnet embedded in the lower shoe 1, which holds the magnetic rolling element 4 by its magnetism.

FIG. 4 shows still another embodiment (third embodiment) of the present invention.

In the present embodiment, a rubber pad 20 is interposed between the upper shoe 2 and the support body 3, and the inclination of the upper structure G is absorbed by the elastic deformation of the rubber pad 20.

The present invention is not limited to the above embodiment, and various design changes can be made within the basic technical concept of the present invention. That is, the following embodiments are included in the technical scope of the present invention.

Fill the spherical seat of the lower shoe 1 with oils and fats for lubrication, rust prevention, sound insulation and damping.

C. Effect of the Invention According to the spherical bearing of the present invention, the bearing body on the rolling element is always in contact with the rolling element during the swinging operation without generating a defective area of the rolling element, and an unstable state is generated. In addition, it is possible to maintain the load supporting capacity and to maintain the minimum rolling resistance, so that a desired action can be exhibited as a spherical bearing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view (sectional view taken along line II of FIG. 2) showing an embodiment of the spherical bearing of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a longitudinal sectional view of another embodiment, and FIG. 4 is a longitudinal sectional view of still another embodiment. B: Lower structure, G: Upper structure, 1: Lower shoe, 3: Bearing,
4 ... rolling element, 5 ... skirt member, 9 ... spherical seat of lower shoe, 16
... Spherical part of bearing

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Practical application Microfilm (JP, U) photographing the contents of the specification and drawings attached to the application form of Japanese Patent Application No. Sho 62-70589 (Japanese Utility Model Application No. Sho 63-179308) A microfilm (JP, U) photographing the contents of the specification and drawings attached to the application form of Japanese Patent Application No. 61-176953 (Japanese Utility Model Application No. 63-83304).

Claims (3)

(57) [Scope of request for utility model registration] A lower shoe fixed to the lower structure and having a spherical seat formed as a concave spherical surface having a large radius of curvature sufficient to obtain a long period upward; And a bearing formed as a convex sphere having a radius of curvature concentric with the concave sphere facing the concave sphere, and having a horizontal movement area with respect to the lower shoe. And a plurality of spherical rolling elements of the same diameter are interposed between these spherical surfaces, and the bearing body transmits the load of the upper structure to the lower shoe via the rolling elements, and In a spherical bearing that performs an oscillating motion following a curvature surface, the rolling element extends to the outside of the convex spherical surface of the support, and the rolling element extends at least less than 1/2 of a maximum oscillating movement distance of the support. Characterized by being arranged within a spherical seat in a range that does not . 2. The spherical bearing according to claim 1, wherein the rolling element is held with magnetic force in a spherical seat of the lower shoe. 3. The spherical bearing according to claim 1, wherein a skirt member is provided on a side surface of the bearing body to secure the rolling elements in a single layer state.