JP2001173718A - Heavy load plane guiding device for base isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heavy load plane guiding device for base isolation with high adaptability to a heavy load. SOLUTION: This heavy load plane guiding device for base isolation 1 has plural rails 10 having ball rolling grooves 11, 12 formed in the length direction, arranged so as to cross each other; an integral guide block 20 arranged between the rails, having an endless circulation passage 29 containing load ball rolling grooves 23, 24 corresponding to the ball rolling grooves 11, 12 of each rail; and plural balls 30 arranged and housed in the endless circulation passage 29 and circulating within the endless circulation passage 29 by the relative motions of the rail 10 and the guide block 20. A crowning part 32 is formed near the end of the load ball rolling groove 23 of the guide block 20, and the crowning amount is set so as to be larger than the elasto-plastic deformation amount of the ball being produced when a radial direction load exceeding a basic static rated load is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar guide device incorporated in a seismic isolation structure of a building or the like.

[0002]

2. Description of the Related Art As a guide device used for a seismic isolation structure such as a building or a part of a floor thereof, a movable platform is arranged between a plurality of orthogonally oriented railway platforms, and the movable platform and each railway platform are arranged. A device has been proposed in which the two are connected so as to be relatively movable via a number of balls (for example, see Japanese Patent Application Laid-Open No. H10-169709).

[0003]

The above seismic isolation guide device has a relatively simple structure, and it is easy to secure sufficient rigidity to withstand a large load applied from a large-scale structure such as a building. There are advantages.

Accordingly, an object of the present invention is to provide a large-load, high-rigidity planar guide device for seismic isolation with further improved adaptability to a large load.

[0005]

Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

According to the first aspect of the present invention, four ball rolling grooves (11, 1) are provided on the upper surface and one on each of the left and right sides along the longitudinal direction.
2) are formed, and are disposed between the plurality of way rails (10A, 10B) arranged orthogonally to each other and the plurality of way rails, and respectively correspond to the ball rolling grooves of each way rail. An integral movable platform (20) having an infinite circulation path (29) including a loaded ball rolling groove (23, 24); and a relative movement between the track base and the movable platform arranged and accommodated in the infinite circulation path. And a plurality of balls (30) circulating in the endless circulation path by movement.

According to the present invention, since the movable base is formed integrally with the upper and lower parts, high rigidity that can withstand a large load of compression and tension applied from the structure is secured.

According to a second aspect of the present invention, there is provided the large-load planar guide device for seismic isolation according to the first aspect, wherein a crowning portion (32) is formed near an end of the load ball rolling groove of the movable base. The crowning amount of the crowning portion is set to be equal to or more than the amount of elastic-plastic deformation of the ball when a radial load exceeding the basic static rated load is applied.

According to the present invention, by the action of the crowning portion provided at the end of the load ball rolling groove of the movable base,
Even in a situation where a large radial load exceeding the basic static load rating is applied, the load on the ball gradually increases at the transition from the no-load region to the load region of the infinite circulation path.

Therefore, rapid elastic deformation of the ball entering the load area is avoided, and the movement of the ball from the no-load area to the load area is performed smoothly. Therefore, there is no possibility that a waving phenomenon in which the movable table is periodically displaced due to a sudden elastic deformation of the ball occurs. This improves the adaptability of the flat guide device to a large load.

When the flat guide device is attached to a building or the like, errors such as parallelism and level of the above-mentioned way are required.
In the case where ignment occurs, the circulation of the ball is usually adversely affected. However, by providing the above-described crowning portion, this error is absorbed, and the circulation of the ball is performed without any trouble.

According to the third aspect of the present invention, a chamfered portion is further provided at an outer end of the crowning portion. For this reason, a discontinuous edge-shaped portion is generated between the crowning portion and the no-load region of the infinite circulation path connected thereto, and when the ball passes through the edge-shaped portion, the load is concentrated and the ball is bitten. There is no risk of getting in. Therefore, the ball is smoothly guided to the crowning portion. In addition, the chamfer amount of the above chamfered portion (amount based on the groove bottom of the ball rolling groove)
However, the effect of the present invention can be more reliably exerted by setting the specific diameter to 4% or more of the ball diameter.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a large-load planar guide device for seismic isolation (hereinafter, may be abbreviated as a planar guide device) 1 according to an embodiment of the present invention. The planar guide device 1 includes two first rails (tracks) 10A, 10A arranged in parallel with each other, and the first rails 10A, 10A.
A, two second rails (tracks) 10B, 10B arranged orthogonal to A, the first rail 10A and the second rail
There are four integrated guide blocks (moving tables) 20... 20 arranged between the rails 10B. In addition,
In the following, when it is not particularly necessary to distinguish the rails 10A and 10B, they are referred to as rails 10.

The details of the fitting portion between the first and second rails 10A and 10B and the guide block 20 are shown in FIGS.
In these drawings, one guide block 20 is shown, but the configuration of the other guide blocks 20 is the same. On the upper surface of each rail 10 (the surface facing the guide block 20), a total of four ball rolling grooves 11 are provided, two on each side.
11 are formed, and ball rolling grooves 12... 12 are formed on both sides of each rail 10 one by one. Each of the ball rolling grooves 11 and 12 extends along the longitudinal direction of the rail 10.

The guide block 20 has a block body 21 made of steel.
The recesses 22A and 22B in which the respective fittings 10B are fitted are formed with their longitudinal directions orthogonal to each other. Load ball rolling grooves 23... 23 corresponding to the ball rolling grooves 11 of the rail 10 are formed on the bottom surfaces of the recesses 22A and 22B, and the ball rolling grooves of the rail 10 are formed on the side walls of the recesses 22A and 22B. 12 are formed. Further, return passages 25... 25 extending parallel to the load ball rolling grooves 23 and 24 and passing through the block main body 21 are formed in the block main body 21.

End plates 26... 26 composed mainly of resin are attached to the end faces of the block body 21. At the outside of the end plate 26, end seals 27 are attached. Each end plate 26 is formed with a direction change path 28 that connects the load ball rolling groove 23 or 24 with the return path 25 described above. An infinite circulation path 29 is formed by a combination of the loaded ball rolling grooves 23 or 24, the return path 25, and the pair of direction change paths 28. Load ball rolling groove 2
The return passage 25 is located in the load region of the infinite circulation path 29.
And a pair of direction change paths 28 correspond to the no-load regions of the endless circulation path 29, respectively.

A number of balls 30... 30 as rolling elements are arranged and accommodated in the endless circulation path 29. When the guide block 20 moves relative to the rails 10A and 10B, these balls 30... 30 circulate in the endless circulation path 29. That is, the ball 30 sandwiched between the loaded ball rolling grooves 23, 24 and the ball rolling grooves 11, 12 rolls in the ball rolling grooves 11, 12 while receiving a load. The ball 30 that has reached one end of the load ball rolling grooves 23 and 24 is scooped up by one direction change path 28 and guided to the return path 25, and from the return path 25 via the other direction change path 28, the load ball rolling is performed. It is returned to the other ends of the running grooves 23, 24.

As shown in FIGS. 6 and 7, a crowned portion 32 is formed near the end of the loaded ball rolling groove 23, and a chamfered portion 3 is formed at an outer end of the crowned portion 32.
3 are formed. In these drawings, only one end of the loaded ball rolling groove 23 is shown, but the other end of the loaded ball rolling groove 23 and both ends of the loaded ball rolling groove 24 have the same crowning. A portion 32 and a chamfered portion 33 are formed.

In FIG. 7, the end surface 2 of the block body 21 is shown.
The distance along the rail longitudinal direction from 1a to the starting point P1 of the crowning part 32 is defined as the crowning length L, and the extension line 32a and the end face 21a of the crowning part 32 with reference to the groove bottom 23a of the load ball rolling groove 23. Assuming that the depth to the intersection P2 with the virtual extension surface 21a1 is the crowning amount A, the ratio A / L between the crowning length L and the crowning amount A is preferably in the range of 0.5 / 100 to 2/100. Is set to When the ratio is smaller than 0.5 / 100, if the crowning length L is set in an appropriate range, the crowning amount is insufficient, and the effect of providing the crowning portion 32 cannot be sufficiently exhibited, and the so-called waving phenomenon is sufficiently exhibited. There is a possibility that it cannot be suppressed. If the ratio exceeds 2/100, the rate of increase of the load when the ball 30 passes through the crowning portion 32 increases, and the effect of providing the crowning portion 32 may not be sufficiently exhibited.

Here, the crowning amount A of the crowning portion 32 is, for example, a radial load R
(See FIG. 3) is set to be equal to or more than the amount of elastic-plastic deformation of the ball 30 when three times the basic static load rating (C0) is applied. The basic static load rating is defined as the sum of the permanent deformation amount of the ball and the permanent deformation amount of the rolling groove in the ball 30 generating the maximum stress and the rolling groove serving as a contact portion thereof, which is 0% of the ball diameter. A static load having a constant direction and magnitude so as to be .0001 times.

The transition from the no-load region to the load region of the infinite circulation path even when a very large radial load of three times or more the basic static load is applied by the action of the crowning portion 32 having the above structure. Ball 3
The load of 0 increases slowly. Therefore, rapid elastic deformation of the ball 30 entering the load area is avoided, and the movement of the ball 30 from the no-load area to the load area is performed smoothly. Therefore, there is no possibility that a waving phenomenon in which the guide block 20 is periodically displaced due to rapid elastic deformation of the ball 30 occurs. This improves the adaptability of the displacement surface guide device to a large load.

When the flat guide device is mounted on a building or the like, errors such as parallelism and level of the rail 10 (miss al
In the case where ignment occurs, the circulation of the ball 30 is usually adversely affected. However, by providing the above-described crowning portion 32, this error is absorbed, and the circulation of the ball 30 is performed without any trouble.

The crowning amount A is specifically set to 2% or more of the diameter of the ball 30. Thereby, the effect of the present invention can be exhibited more reliably.

Further, regarding the chamfered portion 33, the groove bottom 2 is used.
The chamfer amount B (see FIG. 7) based on 3a is set to 4% or more of the diameter of the ball 30. The groove bottom 2
The chamfer angle θ with respect to 3a is set to about 30 °.
That is, the chamfered portion 33 is not a so-called thread chamfer whose chamfer amount is less than 1 mm, but is limited to a chamfered tool that is machined to a predetermined size by a chamfering tool. By providing such a chamfered portion 33, there is no possibility that a discontinuous edge portion is formed at the boundary between the direction change path 28 and the loaded ball rolling grooves 23 and 24, and the ball 30 is formed at the boundary. The load is concentrated on the specific position of the ball 3
There is no risk of biting 0. In addition, the chamfer 33
End point P3 substantially coincides with the end point on the inner peripheral side of the direction change path 28.

Further, by setting the chamfered amount B of the chamfered portion 33 to specifically 4% or more of the ball diameter, the effects of the present invention can be more reliably exerted.

The planar guide device 1 configured as described above
Is, for example, as shown in FIG.
01. The rails 10A and 10B are fixed to the lower surface of the building 100 or the upper surface of the foundation 101, respectively, using the mounting screw holes 10a (see FIG. 2). When a horizontal vibration acceleration is applied between the foundation 101 and the building 100 due to the earthquake, the guide block 20 relatively moves along the rails 10A and 10B according to the direction of the acceleration. Thereby, the shaking of the building 100 is suppressed. The load applied to the planar guide device 1 from the building 100 is extremely large (for example, 100 t per block).
on or more), the crowning portion 32 and the chamfered portion 3 are provided at both ends of the loaded ball rolling grooves 23, 24 of the guide block 20.
3, the ball 30 is smoothly moved from the direction change path 28 to the loaded ball rolling grooves 23 and 24, and the elastic deformation of the ball 30 in the load region of the infinite circulation path 29 progresses gently. I do. Therefore, guide block 2
The waving phenomenon of zero can be suppressed, and the building 100 can be smoothly guided to suppress the shaking.

The above-described crowning length L, crowning amount A, and chamfering amount B are appropriately changed according to the load capacity required for the guide device 1 and the like. , The diameter of the ball 30 is 33.338 m
m, crowning length L is 100 mm, crowning amount A is 0.66 mm, chamfering amount B is 1.4 mm, chamfering angle θ
However, with a combination of 30 °, good guiding performance could be obtained for a large load.

In FIG. 8, a plurality of flat guide devices 1 are arranged in a matrix in a matrix, but, for example, when only a small part of the floor surface is seismically isolated, only a single flat guide device 1 is used. Is sometimes used.

The large-load planar guide device for seismic isolation of the present invention is not limited to the seismic isolation structure of a building or its floor, but can be used for various structures. Ball rolling groove 1 of rail 10
The numbers and positions of 1, 12 may be changed as appropriate. The number of rails may be variously changed. For example, rails may be provided one by one at the top and bottom. The inclination of the crowning part 32 may be constant or may be gradually changed so as to draw an arc.

[0030]

As described above, in the large-load planar guide device for seismic isolation according to the present invention, the use of a vertically integrated moving table requires a large compressive and tensile load applied from the structure. High rigidity to withstand can be secured. By a predetermined crowning part provided at the end of the load ball rolling groove of the carriage,
When the ball moves from the no-load region of the infinite circulation path to the load region, the load of the ball gradually increases. For this reason,
Even in an environment where a large load acts from a large-scale structure such as a building, the ball entering the load area does not suddenly elastically deform,
The movement of the ball from the no-load area to the load area is performed smoothly. Therefore, according to the present invention, there is no possibility that the waving phenomenon caused by the sudden elastic deformation of the ball occurs,
It is possible to provide a seismic isolation guide device that is highly adaptable to large loads.

In addition, when mounting a large-load planar guide device for seismic isolation to a building or the like, if there is an error (miss alignment) in the parallelism or level of the way, the circulation of the ball is usually adversely affected. However, by providing the crowning portion as described above, this error is absorbed, and the circulation of the ball is performed without any trouble.

[Brief description of the drawings]

FIG. 1 is a perspective view of a large-load planar guide device for seismic isolation according to an embodiment of the present invention.

FIG. 2 is an enlarged fragmentary view of a part II in FIG. 1;

FIG. 3 is a side view including a partial cross section of a fitting portion between the guide block and the rail in FIG. 2;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a sectional view of a fitting portion between the guide block and the rail in FIG. 2;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is an enlarged view of a portion VII in FIG. 6;

FIG. 8 is a diagram showing an example of use of the large-load planar guide device for seismic isolation of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Large-load plane guide device for seismic isolation 10A 1st rail (track) 10B 2nd rail (track) 11, 12 Ball rolling groove 20 Guide block (moving platform) 21 Block body 23, 24 Load ball rolling groove 23a Groove bottom 25 Return passage 26 End plate 27 End seal 28 Turning path 29 Infinite circulation path 30 Ball 32 Crowning part 33 Chamfer part 100 Building 101 Foundation A Crowning amount B Chamfering amount L Crowning length θ Inclination angle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeki Shirai 3-11-6 Nishi-Gotanda, Shinagawa-ku, Tokyo TEK Corporation (72) Inventor Eiichi Michioka 3-11 Nishi-Gotanda, Shinagawa-ku, Tokyo No. 6 Inside TEK Corporation (72) Inventor Masashi Kimoto 3-11-6 Nishigotanda, Shinagawa-ku, Tokyo Inside TEKK Corporation (72) Inventor Nobuyoshi Murai 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute, Inc. (72) Inventor Yoshihide Uchiyama 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Incorporated Technology Institute, Takenaka Corporation (72) Inventor Masashi Yamamoto 1-5, Otsuka, Inzai City, Chiba Prefecture Address 1 Inside Takenaka Corporation Technical Research Institute (72) Inventor Ichiichi Kusakabe 4-1-1-13 Honcho, Chuo-ku, Osaka-shi, Osaka (72) Inventor Hiroshi Kurabayashi 3-5-3 Tatsumi, Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division (72) Inventor Toshio Komi 3-5-3, Tatsumi, Koto-ku, Tokyo Mitsubishi Daisuke Yaguchi (72) Inventor Daisuke Yaguchi 3-5-3 Tatsumi, Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division F-term (reference) 3J048 AA07 BG02 DA01 EA38 3J104 AA03 AA23 AA37 AA65 AA69 AA74 AA77 BA32 BA36 DA02 DA12 EA10

Claims (3)

[Claims] 1. A plurality of raceways which are formed so that four ball raceways are formed on an upper surface and one raceway groove is formed on both left and right sides along a longitudinal direction, and are arranged so as to be orthogonal to each other; And an integrated moving table in which an infinite circulation path including a loaded ball rolling groove respectively corresponding to the ball rolling groove of each raceway is formed; and A large load planar guide device for seismic isolation, comprising: a plurality of balls circulating in the endless circulation path by a relative movement of a track base and the movable base. 2. A ball when a radial load exceeding a basic static load rating is applied to a crown portion formed near the end of the loaded ball rolling groove of the moving table. 2. The large-load flat guide device for seismic isolation according to claim 1, wherein the large-load flat guide device is set to be equal to or more than the elasto-plastic deformation amount. 3. The large-load planar guide device for seismic isolation according to claim 1, wherein a chamfered portion is formed at an outer end of the crowning portion.