JP2000110990A - Bearing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing body preventing such phenomena as lock, slip of rolling elements and allowing good rolling performance at all times. SOLUTION: A bearing body comprises a supporting leg 2 to support a structure on the oversurface 15a of a basement 15, a crust 3 provided on the outside of the leg 2, rolling elements 7 and 8 in spherical form to support the leg 2 where the total rate of filling is below 96% and the rate in the space between the undersurface 2d of the leg 2 and the oversurface 15a of the basement 15 is 70-98% and rolling in compliance with the relative movement of the leg 2 with the basement 15, and a rolling element accommodating space 6 formed between the outside surface of the leg 2 and the inside surface of the crust 3 for accommodating the rolling elements 7 and 8 and allowing the rolling elements 7 and 8 rolling in association with the relative movement of the leg 2 with basement 15 to move in compliance with the relative movement so that they are supplied to between the undersurface 2d of the leg 2 and the oversurface 15a of the basement 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing that supports a heavy object such as a structure and that can move horizontally in a free direction via a rolling element.

[0002]

2. Description of the Related Art For example, a bearing disclosed in Japanese Utility Model Publication No. 3-29674 is a bearing that supports the entire floor on which a heavy object such as a computer is attached so as to be movable in an arbitrary horizontal direction. The support body includes an outer housing fixed to the lower surface of the floorboard, a disk-shaped support member positioned in the outer housing, integrally supported by and supported by the outer housing, and having a flat lower support surface. A large number of small balls are provided between the outer housing and the support member, and the inner side surface of the outer housing is formed in an arcuate concave curved surface and connected to the inner peripheral surface above the curved surface, and the support member has The outer peripheral portion has a convex curved surface similar to the inner peripheral surface of the outer housing,
A small ball accommodating space through which small balls can pass in a single row is formed over the upper inner peripheral surface. In this configuration, the small balls are arranged without gaps in the lower ball receiving space and the entire area between the lower surface of the bearing member and the base surface.

[0003]

However, according to the above-mentioned conventional support, the small balls as rolling elements circulate in one row in the gap of the small ball housing space between the outer casing and the support member. Due to the structure, the precision of the gap in the small ball accommodating space is required, and the cost of the support increases. Further, since the small balls are arranged on the lower surface of the support member without any gap, the small balls may cause a locking phenomenon or a sliding phenomenon during horizontal movement, which may hinder the rolling of the small balls. Cannot be successfully enabled. In addition, since the heavy object supporting the support leg is directly connected, the support leg is directly affected by the vertical vibration, and the impact may damage the support or the small ball, or the small ball may fly out. In addition, when the movement of the heavy object to be supported is complicated or the mounting height of the support is high, if the support legs are fixed, the load balance of the small balls is lost, and the movement of the support deteriorates. Furthermore, small balls have many problems, such as rust and the like rolling over a long period of use due to the use of ordinary bearing balls, and poor rolling.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a bearing that prevents a locking phenomenon and a sliding phenomenon of a rolling element and always enables good rolling. .

[0005]

According to the present invention, in order to achieve the above object, according to the present invention, a support leg for supporting a structure on an upper surface of a base, and an outer leg provided outside the support leg. A shell having an overall filling factor of 96% or less, and a supporting ratio of 70 to 98% between the lower surface of the supporting leg and the upper surface of the base to support the supporting leg; And a spherical rolling element that rolls in accordance with the relative movement of the base and the base, and formed between the outer surface of the support leg and the inner surface of the outer shell to house the rolling element, and the support leg and the base And a rolling element storage space for moving a rolling element that rolls in accordance with the relative movement of the supporting leg and supplying the rolling element between the lower surface of the support leg and the upper surface of the base.

[0006] The support transmits the load of the structure to the upper surface of the base via the rolling elements. For example, when the base moves horizontally due to an earthquake, each rolling element interposed between the lower surface of the support leg and the upper surface of the base moves while rolling. Thus, the support body keeps the structure substantially stationary with respect to the horizontal movement of the substrate. The bearing body has a total filling factor of the rolling element of 96% or less, and a filling rate of the rolling element supporting the support leg between the lower surface of the support leg and the upper surface of the base is 70 to 98%. By doing so, it is possible to prevent a locking phenomenon and a sliding phenomenon caused by friction between the adjacent rolling elements when the rolling elements roll.

According to a second aspect of the present invention, the supporting leg comprises a substantially frustoconical supporting portion and a shaft integrally formed on the top of the supporting portion. The length of the inclined surface of the supporting portion and the diameter of the lower surface of the supporting portion are formed. Is 0.4 or more. When the ratio between the length of the inclined surface of the support leg and the diameter of the lower surface is set to 0.4 or more, the width of the rolling element in the moving direction on the inclined surface is increased, and the rolling element can move smoothly without causing a locking phenomenon.

According to a third aspect of the present invention, the rolling element has a first rolling element supporting the support leg and a smaller diameter than the first rolling element, and sets a filling rate of the first rolling element. It is characterized by comprising a second rolling element. By mixing the rolling element with the first rolling element supporting the supporting leg and the second rolling element having a smaller diameter than the first rolling element, the lower surface of the supporting leg and the upper surface of the base are mixed. The filling factor of the first rolling element interposed and supporting the support leg can be set to an arbitrary value of 70 to 98%.

According to a fourth aspect of the present invention, the rolling element has been subjected to surface treatment for rust prevention and lubrication. The rolling element is maintained in a good rolling state by using the bearing for a long period of time by the surface treatment of rust prevention and lubrication, and the phenomenon that the rolling element is locked and slips is prevented. In addition, the rolling elements can favorably move in the rolling element moving space.

According to a fifth aspect of the present invention, the gap in the rolling element housing space is characterized in that the rolling elements are movable in multiple rows. By setting the gap in the rolling element housing space to a size that allows the rolling elements to move in a double row, the rolling elements can move extremely well without causing a locking phenomenon in the rolling element housing space.

According to a sixth aspect of the present invention, the support body is provided with a support means for elastically supporting the structure at an upper portion thereof. When the support body receives vibrations in the vertical direction, the support means absorbs the vibrations and is pressed against the base, so that the rolling elements interposed between the lower surface of the support legs and the upper surface of the base protrude. Is prevented.

According to a seventh aspect of the present invention, the support body is provided with a support means for supporting the structure so as to be rotatable in a horizontal plane and three-dimensionally freely tiltable on the upper part. Thereby, the support body can operate smoothly without being affected by the movement of the structure to be supported against vertical vibration and horizontal movement. According to an eighth aspect of the present invention, the outer shell is provided with a transparent window that opens to the rolling element housing space.

Thus, it is possible to confirm and monitor the rolling state of the rolling elements in the rolling element housing space from the transparent window.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view showing a first embodiment of a bearing according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. As shown in FIGS. 1 and 2, the support 1 includes a support leg 2, an outer shell 3, a rolling element housing space 6 formed between the support leg 2 and the outer shell 3, and rolling elements 7 and 8. And the like.

As shown in FIG. 2, the support leg 2 has a substantially frustoconical support portion 2a and a shaft 2b formed perpendicularly to the top of the support portion 2a. Support part 2a
The outer peripheral surface 2c has a convex curved surface, the lower surface 2d is a flat surface, and the upper surface 2e is an inclined surface having a gentle upward slope from the peripheral edge. A flange 2f is formed at the lower part of the shaft 2b, and a screw 2g is engraved at the upper part.
The lower surface 2d of the support 2a is a rolling surface of the rolling element 7.

The support leg 2 is formed of an iron member, for example, by casting or forging, and has a lower surface 2d of the support portion 2a.
In the long-term use of the bearing 1, the rolling elements 7, 8
In order to maintain smooth rolling, surface treatments such as rust prevention and lubrication are applied. As this surface treatment, for example, a manganese phosphate-based chemical conversion treatment film is formed as a base treatment, and a rust-preventing and lubricating film is formed thereon as a molybdenum disulfide-based organic bonding solid lubricating film. Note that the outer surface of the support portion 2a, that is, the outer peripheral surface 2c and the upper surface 2e do not necessarily need to be subjected to surface treatment such as rust prevention and lubrication, but when the bearing body 1 is used for a long time, the lower surface 2d is considered. It is preferable to perform surface treatment such as rust prevention and lubrication in the same manner as described above.

The outer shell 3 has a disk shape and comprises an upper outer shell 4 and a lower outer shell 5 which can be divided into upper and lower parts. The inner surface of the outer shell 3
The support leg 2 is formed so as to have a concave surface substantially similar to the outer surface of the support portion 2a. That is, the upper outer shell 4 has an inner surface 4a having a similar shape to the outer surface extending from the center of the outer peripheral surface 2c of the support portion 2a to the upper surface 2e. For example, the rolling elements 7 and 8
Can be opposed in a double row, for example, two rows with a movable interval (gap), and a hole 4d in which the shaft 2c of the support leg 2 is inserted into the center of the upper part 4b and the flange 2f is fitted. Are provided concentrically. A screw hole 4e having a diameter larger than that of the rolling element 7 is formed in the upper portion 4b in parallel with the shaft hole 4c, and is opened on the inner surface 4a. The upper outer shell 4 is formed of, for example, an iron member such as cast iron like the support leg 2.

In consideration of the long-term use of the bearing 1, the inner surface 4 may be used to improve the movement of the rolling elements 7, 8.
It is preferable that a is subjected to surface treatment such as rust prevention and lubrication similarly to the support leg 2. The inner surface 5a of the lower outer shell 5 has a similar shape to the outer surface extending from the center of the outer peripheral surface 2c of the support portion 2a to a portion connected to the lower surface 2d, and is fixed to the upper outer shell 4,
Similarly to the inner surface 4a of the upper outer shell 4, the outer surface of the support portion 2a can be opposed to the predetermined distance, that is, the rolling members 7, 8 can be moved in a double row, for example, with a gap (gap) movable in two rows. You. The inner surface 4a of the upper outer shell 4 and the inner surface 5a of the lower outer shell 5
Continue smoothly. The lower shell 5 is formed of a synthetic resin member such as an acrylic resin member (ultra high molecular weight polyethylene) so that no load is applied. By forming the lower outer shell 5 from a synthetic resin member in this way, cost reduction can be achieved, and further, since the inner surface 5a does not require surface treatment such as rust prevention and lubrication, further cost reduction can be achieved. Can be

The rolling element 7 is a load ball (hereinafter referred to as "load ball 7") for supporting the bearing body 1, and is, for example, a small ball (for example, having an outer diameter of 10 mm) formed of bearing steel, chrome steel, or the like. Surface treatment such as rust prevention and lubrication as described above. Load ball 7
It is not always necessary to perform surface treatment such as rust prevention and lubrication, but it is preferable to perform surface treatment such as rust prevention and lubrication in order to secure good rolling properties over a long period of time.

The rolling elements 8 are spacer balls (hereinafter referred to as "spacer balls 8") for adjusting the filling ratio of the load balls 7, and have a slightly smaller diameter (for example, an outer diameter of the load balls 7). 9.8-9.9 mm).
The spacer ball 8 can be used without any load, for example,
It is formed of small spheres of synthetic resin such as plastic. The spacer balls 8 may be steel balls like the load balls 7. However, when steel balls are used, it is preferable to perform surface treatment such as rust prevention and lubrication, which increases the cost. On the other hand, when formed from a synthetic resin member such as plastic, the surface treatment is not required, so that the cost can be greatly reduced and lubricity is provided, which is preferable.

On the other hand, for example, a base 15 for mounting the support 1 is installed at a predetermined position where a building structure is constructed. The upper surface 15 a of the base 15 serves as a rolling surface for the load balls 7 and the spacer balls 8 of the support 1. Base 1
Reference numeral 5 is a square having a predetermined size so as to enable horizontal movement of the support 1 in all directions. For example, in order to cope with an earthquake or the like, a square having a side of about 1 m is provided, and the support 1 is disposed at the center. This base 1
5 is made of stainless steel having corrosion resistance and has a smooth upper surface 15a, so that the load balls 7 and the spacer balls 8 can be satisfactorily rolled when the support 1 is used for a long time.

The upper outer shell is mounted on the upper part of the support leg 2,
The shaft 2b is inserted through the shaft hole 4c, the flange 2f is fitted into the hole 4d, is positioned and locked, and the nut 12 is screwed and fixed to the screw 2g via the washer 11. Next, the lower outer shell 5 is mounted and fixed to the upper outer shell 4 at a plurality of locations at equal intervals in the circumferential direction by bolts 13. A load ball 7 and a spacer ball are provided between the outer surface (upper surface 2d to outer peripheral surface 2c) of the support portion 2a of the support leg 2 and the inner surface of the outer shell 3 (inner surface 4a of the upper outer shell 4 to inner surface 5a of the lower outer shell). A rolling element storage space 6 in which the rolling elements 8 and the like can move vertically in two rows is formed. The rolling element housing space 6 has a lower end opening in the direction of the lower surface 2 d of the support portion 2 a of the support leg 2.

The distance d between the upper surface 15a of the substrate 15 and the lower surface 5b of the lower shell 5 is set to be considerably smaller than the outer diameter of the load ball 7 (about 0.5 to 1 m). The height of the end 5 c from the upper surface 15 a of the base 15 is set at a position lower than the center position of the spacer ball 8. As a result, when the load balls 7 and the spacer balls 8 roll and circulate, as described later, these balls can rise and move into the rolling element housing space 6.

The upper outer shell 4 is provided with a cover (window) formed of a transparent resin member, and the lower outer shell 5 is formed of a transparent resin member. In addition, the rolling state of the spacer ball 8 can be constantly checked and monitored. In addition, upper shell 4 and lower shell 5
A hole (window) in which the load ball 7 and the spacer ball 8 can be exchanged may be provided.

The support 1 has a lower surface 2d of the support surface 2a of the support leg 2 substantially at the center of the upper surface 15a of the base 15.
A is lifted (floated) from a in a state in which an interval slightly larger than the outer diameter of the load ball 7 is provided. Then, the load balls 7 and the spacer balls 8 are supplied to the rolling element housing space 6 from the holes 4e of the upper outer shell 4 in a state of being mixed at a ratio described later. The lower surface 2d of the support leg 2 is the base 15
Is lifted from the upper surface or 15a of the support ball 2 at a distance slightly larger than the outer diameter of the load ball 7, so that the load ball 7 and the spacer ball 8 supplied to the rolling element housing space 6 The space is filled between the lower surface 2d and the upper surface 15a (FIGS. 2 and 3). The screw hole 4e is
Used for replenishing and exchanging balls.

Next, the support 1 is lowered, and the lower surface 2a of the support leg 2 is brought into contact with the load ball 7. The spacer ball 8 is slightly separated from the lower surface 2d of the support leg 2. In this state, the lower surface 5b of the lower outer shell 5 is separated from the base surface 15 with the above-mentioned slight distance d (0.5 to 1 mm). Thus, the support leg 2 is placed at a substantially central position on the upper surface 15a of the base 15 via the large number of load balls 7. Then, a structure (not shown) is placed on the upper outer shell 4 of the support 1. Thus, the support 1 supports the structure on the base 15 via the load balls 7.

By the way, the rolling element is a mixture of two kinds of balls, the load ball 7 and the spacer ball 8, and the mixing ratio of the spacer ball 8 is set to, for example, 5 to 25%, and the lower surface 2d of the support leg 2 and the base 15 are formed. The filling ratio of the load ball 7 interposed between the upper surface 15a and the upper surface 15a is set to about 70 to 98%.
This prevents the locking phenomenon of the load ball 7 when the support 1 operates.

The mixing ratio of the spacer balls 8 is 5-25.
The reason for the lowering of the percentage is to replace the circulating load balls 7 and the spacer balls 8 during the operation of the support 1 and to minimize the load applied to the support. That is, when the mixing ratio of the spacer balls 8 is increased,
When the load balls 7 and the spacer balls 8 circulate in a mixed state, the number of the load balls 7 supplied between the lower surface 2d of the support leg 2 and the upper surface 15a of the base 15 may be reduced. Lower surface 2d of support leg 2 and upper surface 15a of base 15
When the number of the loaded balls 7 between them is reduced, the load applied to these loaded balls 7 is increased, and the durability and the rolling properties are reduced. In order to prevent such a problem, the mixing ratio of the spacer balls 8 is set to about 5 to 25% as described above.

The operation will be described below. In FIG. 2, the support 1 transmits the load of the structure to the upper surface 15a of the base 15 via the load ball 7. The base 15 is, for example,
When horizontally moved in the direction of arrow A due to the earthquake, each load ball 7 interposed between the lower surface 2d of the support leg 2 of the support 1 and the upper surface 15a of the base 15 rolls in the direction of arrow B in FIG. . On the other hand, since the spacer balls 8 interposed between these load balls 7 have slightly smaller diameters than the load balls 7, they rotate in the direction of arrow C following the rolling of the adjacent load balls 7. . Thereby, the locking phenomenon of the adjacent load balls 7 is prevented.

By the way, the load balls 7 and the spacer balls 8 have the above-mentioned mixing ratio, and the spacer balls 8 are not interposed between all the adjacent load balls 7. There are some places where only 7 are adjacent (close together). However, since the load balls 7 have been subjected to the lubricating surface treatment, the surfaces in contact with each other slide, and the locking phenomenon is avoided. In addition, since the load ball 7 is also provided with a rust-preventive surface treatment, it can be kept in a state in which it can roll well for a long period of time. As a result, the locking phenomenon and the sliding phenomenon of the load ball 7 are extremely good. Is prevented. Along with this,
The upper surface 15a of the base 15, the lower surface 2d of the support leg, and the load ball 7 are prevented from being scratched, and a good rolling surface is maintained.

As shown in FIGS. 2 and 3, the load ball 7 and the spacer ball 8 roll with the horizontal movement of the base 15 in the direction of arrow A and reach the open end 5c of the lower outer shell 5. The height of the open end 5c of the lower outer shell 5 from the base surface 15 is set at a position lower than the center position of the spacer ball 8, so that the load ball 7 and the spacer ball 8 face the moving direction. And gradually pushes up to the opening end 5c on the side and is pushed up into the rolling element housing space 6. The rolling element housing space 6 has a load ball 7 between the outer surface of the support leg 2 and the load ball 7.
The load balls 7 and the spacer balls 8 move smoothly upward in the direction indicated by the arrow D, and then descend from the opposite side as indicated by the arrow E, or move right and left as shown in the arrow E. It is divided and moves along the circumferential direction as shown by the arrow F and is pushed out from the opening end 5c on the opposite side of the rolling element housing space 6, and the lower surface 2d of the support leg 2 and the upper surface 15 of the base 15
and is supplied sequentially between the two. That is, the load ball 7 and the spacer ball 8 move according to the horizontal movement of the base 15. When the moving distance of the support 1 is long, the load balls 7 and the spacer balls 8 circulate.

Thus, the support 1 holds the structure substantially stationary with respect to the horizontal movement of the base 15. Furthermore,
The support 1 has a lower surface 5 b of the lower outer shell 5 and an upper surface 1 of the base 15.
Since the base surface 15 is slightly separated from the base 5a, the base surface 15 is reliably held substantially stationary against horizontal movement in the direction of arrow A. In this way, the support 1 keeps the building structure substantially stationary against the horizontal movement of the base 15 in all directions.

As shown in FIGS. 4 and 5, when the shaft diameter d of the shaft 2b formed on the top of the support portion 2a of the support leg 2 is small, the length of the upper surface 2e of the support portion 2a is small. L becomes longer, that is, the width of the path of the load ball 7 and the spacer ball 8 becomes wider, and the movement of these becomes easier. On the other hand, when the shaft diameter d ′ of the shaft 2b is large as shown in FIGS. 6 and 7, the length L ′ of the upper surface 2e of the support portion 2a is short, that is, the load ball 7, The width of the passage of the spacer balls 8 becomes narrow, and it becomes difficult to move them.

The diameter D of the lower surface 2d of the support portion 2a corresponds to the moving distance of the load ball 7 and the spacer ball 8 between the lower surface 2d and the upper surface 15a of the substrate 15. Therefore, the diameter D of the lower surface 2d of the support portion 2a and the length L of the upper surface 2e
As shown in FIG. 8, when L is in the range of 0.4D or more, the load ball 7 and the spacer ball 8 move well without locking, and when L is in the range of 0.2D or less, the load ball 7 and the spacer ball 8 move. 7. The spacer ball 8 is locked and cannot be moved. When L is in the range between 0.2D and 0.4D, the load ball 7 and the spacer ball 8 may be locked. Note that, in the range of 0.2D and 0.4D, a portion shown by oblique lines is a range of variation in dimensional accuracy. Therefore, the length L of the upper surface 2e of the support 2a is set to 0.4D.
With the above setting, the locking phenomenon of the load ball 7 and the spacer ball 8 can be completely prevented.

In this case, the length L of the upper surface 2e as a passage for the load balls 7 and the spacer balls 8 is not affected by the angle θ between the lower surface 2d and the upper surface 2e. This is thought to be due to the range in which the load balls 7 and the spacer balls 8 are likely to rise on the upper surface 2e depending on the angle of θ. In consideration of the weight of the load balls 7 and the spacer balls 8,
Probable error range.

FIG. 9 shows the overall filling rate and the coefficient of friction of the load balls 7 and the spacer balls 8 in the space formed between the outer shell 3 of the support 1, the support legs 2 and the upper surface 15a of the substrate 15. The relationship is shown below. As is clear from this graph, the coefficient of friction is small when the filling rate is 96% or less, and rapidly increases when the filling rate exceeds 96%. Therefore, it is preferable that the filling ratio of the rolling elements, that is, the load balls 7 and the spacer balls 8 as a whole is 96% or less.

Further, the clearance between the rolling element housing spaces 6 is set so that the load balls 7 can be moved in two rows (multiple rows).
Even if the vertical interval is slightly varied, the load ball 7,
The spacer balls 8 can move smoothly. Therefore, it is not necessary to increase the precision of the gap in the rolling element housing space 6, the manufacturing is facilitated, and the cost can be significantly reduced.

The inner surface of the rolling element housing space 6, ie, the outer peripheral surface 2c and the upper surface 2e of the support portion 2a, the inner surface 4a of the upper outer shell 4,
By performing surface treatment such as rust prevention and lubrication on the inner surface 5a of the lower outer shell 5, the load balls 7, and the like, the gap of the rolling element storage space 6 can be set as an interval in which the load balls 7 can move in a single row.
The load balls 7 and the spacer balls 8 can move favorably in the rolling element housing space 6. In this case, surface treatment such as rust prevention and lubrication may be performed only on the load ball 7, but it is preferable to perform surface treatment such as rust prevention and lubrication on the inner surface of the rolling element housing space 6.

The lower surface 5b of the lower shell 5 and the upper surface 1 of the base 15
Since the distance (gap) d from the space 5a is small, dust and the like rarely enter the inside, but a dustproof cover is attached to the lower part of the outer peripheral surface of the lower outer shell 5 over the entire periphery to close the gap. Is also good. In particular, when the support 1 is used as a support of a building structure, it is preferable to provide the cover because it is installed under the floor.

(Embodiment 2) FIG. 10 is a sectional view showing a second embodiment of the bearing according to the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 10, the support body 20 is a shoulder 4 f of the upper outer shell 4.
A support member 23 is mounted on the support member via elastic members, for example, disc springs 21 and 22. A structure to be supported by the support member 23 is mounted on the support member 23. It is fixed by nuts (not shown) that are screwed together. The support member 23 is formed of an iron member. Note that the support member 23 may be a hard resin member or the like depending on the specification, which is preferable from the viewpoint of cost reduction. Other configurations are exactly the same as those of the first embodiment.

When vertical vibrations occur due to an earthquake or the like, the disc springs 21 and 22 absorb the vertical vibrations and reduce the impact. This prevents the support 1 from being damaged.
In addition, since the support leg 2 is constantly pressed against the upper surface 15a of the base 15 by the spring force (preload) of the disc springs 21 and 22, floating from the upper surface 15a due to vertical vibration is prevented, and the lower surface 2a of the support portion 2 is prevented. The load balls 7 and the spacer balls 8 between the lower shell 5 and the upper surface 15a are prevented from being caught between the upper surface 15a and the lower surface 5b of the lower outer shell 5 or jumping out.

(Embodiment 3) FIG. 11 is a sectional view showing a third embodiment of the bearing according to the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 11, the support 25 is a top surface 4 g of the upper shell 4.
A support member 28 is placed on the support member 28 via an elastic member, for example, a plurality of disc springs 26, and a support member 29 is placed on the support member 28.

The upper surface 28a of the support member 28 is a curved surface that is convex upward. The support member 29 has a concave surface that is concave downward at the center of the lower surface, and has a seat surface 29 a having the same curvature as the curvature of the upper surface 28 a of the support member 28. The support member 29 is connected to the upper surface 28a of the support member 28 via the seat surface 29a.
Placed on Thus, the support member 29 can be freely rotated in a horizontal plane with respect to the support body composed of the support leg 2 and the outer shell 3 and can be freely tilted three-dimensionally.

Then, the structure is placed on the support member 29, and is fixed by a bolt inserted through the bolt hole 29b and a nut (not shown) screwed to the bolt. Other configurations are exactly the same as those of the first embodiment. The support members 28 and 29 are formed of iron members. Note that the support members 28 and 29 may be made of a hard resin member or the like depending on the specification, which is preferable from the viewpoint of cost reduction.

Thus, the support body 25 absorbs the vertical vibration by the plurality of disc springs 26, and the support member 29 can rotate in the horizontal plane with respect to the support leg 2 and can be freely tilted three-dimensionally. By doing so, it is possible to operate smoothly without being affected by the movement of heavy objects to be supported against vertical vibration and horizontal movement due to an earthquake or the like. (Embodiment 4) FIG. 12 is a sectional view showing a fourth embodiment of the bearing according to the present invention. In the fourth embodiment, when the range of movement of the bearing body is limited, there is no need to circulate the rolling elements as shown in the first to third embodiments, and there is sufficient movement necessary for movement to the side of the support leg. The horizontal movement of the bearing body is made possible by holding the amount of rolling elements.

As shown in FIG. 12, the support 30 has a structure in which the support legs 2 and the outer shell 3 of the support 1 shown in the first embodiment are integrally formed. The support 30 has a disk shape,
A large annular recess 30b opening at 0a is formed concentrically. The central portion 30c is the support portion (the support leg 2 of the first embodiment).
The outer peripheral portion 30d is an outer shell (corresponding to the outer shell 3 of the first embodiment), and the annular concave portion 30b is a rolling element housing space (hereinafter, referred to as a "rolling element housing space 30b").

The rolling element housing space 30b has a wide upper portion 30b ', for example, a size capable of accommodating a plurality (for example, three) of the load balls 7 concentrically and side by side (triple). Open end 30 that opens to lower surface 30a of the outer side surface
e, 30f are inclined surfaces inclined in the center direction of the lower surface 30a, and the gap is formed by a double row of load balls 7 such as 2
The width is movable in columns.

The lower surface 30g of the support portion 30c is a rolling surface and is set slightly lower than the outer diameter of the load ball 7 than the lower surface 30a of the outer peripheral portion 30d. Also, the opening end 30f
The height of the base 15 from the upper surface 15a is set at a position lower than the center position of the spacer ball 8, so that the load ball 7 and the spacer ball 8 can easily move up to the rolling element storage space 30b. It has been. The support body 30 is formed integrally with an iron member. The lower surface 30g as the rolling surface of the support 30c and the inner surface of the rolling element housing space 30b are preferably subjected to surface treatment such as rust prevention and lubrication as described above.

Then, between the lower surface 30a of the rolling element housing space 30b and the support portion 30c and the upper surface 15a of the base 15, the load balls 7 and the spacer balls 8 are supplied. The upper part of the rolling element housing part 30b is a space part, and can store these when the load ball 7 and the spacer ball 8 roll. Then, the support is placed on the upper surface of the support 30.

When the support 30 moves horizontally in the direction of arrow A, the load balls 7 and the spacer balls 8 roll accordingly, move in the direction of arrow A, and are pushed up into the rolling element housing space 30b from the right side in the drawing. On the other hand, the rolling element storage space 30b
3, the load balls 7 and the spacer balls 8 are sequentially supplied between the lower surface 30 a of the support portion 30 c and the upper surface 15 a of the base 15 from the left side. Then, as the load balls 7 and the spacer balls 8 on the left side in the figure decrease, the load balls 7 and the spacer balls 8 pushed up to the right side in the figure move right and left in the rolling element housing space 30b and move in the circumferential direction. While moving to the supply side. Thus, the load balls 7 and the spacer balls 8 are sequentially supplied between the lower surface 30g of the support 30c and the upper surface 15a of the base 15.

It is to be noted that a window is provided in the outer peripheral portion 30d, a transparent resin member or the like is mounted, and the rolling state of the internal load balls 7 and the spacer balls 8 can be checked and monitored, or these rolling elements can be replaced. You may do so. Further, in each of the above embodiments, the case where the building is supported is described. However, the present invention is not limited to this. For example, a machine tool,
It can also be used as a rolling bearing for precision equipment and electronic computers.

[0052]

As described above, according to the first aspect of the present invention,
In the bearing, the total filling rate of the rolling elements is 96% or less,
In addition, by setting the filling factor of the rolling element interposed between the lower surface of the supporting leg and the upper surface of the base to support the supporting leg at 70 to 98%, a locking phenomenon and a sliding phenomenon at the time of rolling of the rolling element. Is prevented, and it is possible to favorably and stably support the structure.

In the second aspect, the ratio of the length of the inclined surface of the support portion having a substantially frustoconical shape to the diameter of the lower surface is 0.4 or more, so that the width of the rolling element in the moving direction on the inclined surface is increased, It is possible to move smoothly without causing a locking phenomenon. In claim 3, the rolling element is a first rolling element that supports the support leg,
By mixing the second rolling element having a diameter smaller than that of the first rolling element, filling the first rolling element interposed between the lower surface of the support leg and the upper surface of the base to support the support leg. Rate 70
It can be set to any value of ~ 98%.

According to the fourth aspect, the rolling element can be used for a long period of time by using the bearing body by rust prevention and lubrication surface treatment.
A good rolling state is maintained, and a slip phenomenon is prevented. In addition, the upper surface of the base is prevented from being scratched. Further, the rolling elements can move well in the rolling element moving space. According to the fifth aspect, the rolling element housing space has such a size that the rolling elements can move in multiple rows, so that the rolling elements can move extremely well in the rolling element housing space. Further, it is not necessary to increase the precision of the gap in the rolling element housing space, the manufacturing becomes easy, and the cost is greatly reduced.

According to the sixth aspect, when the bearing is subjected to vertical vibration, the bearing is pressed against the base by the support means, so that the rolling element interposed between the lower surface of the support leg and the upper surface of the base. Is prevented from jumping out. In claim 7,
By supporting the structure so that it can rotate freely in a horizontal plane and freely tilt three-dimensionally, the bearing can smoothly move without being affected by the movement of the structure to be supported against vertical vibration and horizontal movement. It is possible to operate.

According to the eighth aspect, the rolling state of the rolling elements in the rolling element housing space can be confirmed and monitored from the transparent window of the outer shell.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of a bearing according to the present invention.

FIG. 2 is a cross-sectional view of the bearing shown in FIG. 1 taken along the line II-II.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an explanatory diagram showing a relationship between the length of the upper surface of the support portion and the diameter of the lower surface when the rolling element moves favorably in the support portion of the support leg in FIG. 2;

FIG. 5 is a plan view showing a state in which rolling elements move on the upper surface of the support shown in FIG. 4;

6 is an explanatory diagram showing the relationship between the length of the upper surface of the support and the diameter of the lower surface when the rolling element causes a locking phenomenon in the support of the support leg of FIG. 2;

FIG. 7 is a plan view showing a state in which rolling elements move on the upper surface of the support section shown in FIG. 6;

FIG. 8 is an explanatory diagram showing a relationship between a ratio of a length of an upper surface and a diameter of a lower surface of a support portion for a rolling element to move in the support legs of FIGS. 4 and 6, and a coefficient of friction.

FIG. 9 is an explanatory diagram showing a relationship between a filling factor of the entire rolling element and a friction coefficient in the bearing shown in FIG. 2;

FIG. 10 is a sectional view of a second embodiment of the bearing according to the present invention.

FIG. 11 is a sectional view of a third embodiment of the bearing according to the present invention.

FIG. 12 is a sectional view of a fourth embodiment of the bearing according to the present invention.

[Explanation of symbols]

 1, 20, 25, 30 Supporting body 2 Support leg 2a, 30c Supporting part 3 Outer shell 4 Upper outer shell 5 Lower outer shell 6, 30b Rolling element storage space 7 Load ball (rolling element) 8 Spacer ball (rolling element) 21 , 22,26 Disc spring (elastic member)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Tadao Saji 6-1, Hanamidai, Arashiyama-machi, Hiki-gun, Saitama Prefecture Inside Arashiyama Plant of Daido Precision Industries Co., Ltd. (72) Takeshi Nakamura 4-640, Shimoseito, Kiyose-shi, Tokyo Obayashi Technical Research Institute

Claims (8)

[Claims] 1. A support leg for supporting a structure on an upper surface of a base; an outer shell provided outside the support leg; a total filling factor of 96% or less; and a lower surface of the support leg and the base. A spherical rolling element interposed between the support leg and the upper surface of the support leg at a filling rate of 70 to 98% to support the support leg and roll in accordance with a relative movement between the support leg and the base; The supporting member is formed between an outer surface and an inner surface of the outer shell to accommodate the rolling element and to move the rolling element that rolls with the relative movement of the support leg and the base in accordance with the relative movement to thereby support the rolling element. A bearing body comprising a rolling element storage space to be supplied between a lower surface of a leg and an upper surface of a base. 2. The support leg includes a support portion having a substantially frustoconical shape and a shaft portion integrally formed on a top of the support portion, and a ratio of a length of an inclined surface of the support portion to a diameter of a lower surface. Is 0.
The support according to claim 1, wherein the number is four or more. 3. The rolling element has a first rolling element that supports the support leg and a second rolling element having a smaller diameter than the first rolling element, and a second rolling element that sets a filling factor of the first rolling element. 3. The bearing according to claim 1, wherein the bearing comprises a rolling element. 4. The bearing according to claim 1, wherein the rolling element is subjected to surface treatment for rust prevention and lubrication. 5. The bearing according to claim 1, wherein the rolling element is movable in a double row in the gap in the rolling element housing space. 6. The bearing according to claim 1, wherein the bearing is provided with support means for elastically supporting the structure on an upper portion. 7. The support according to claim 1, wherein the support is provided at an upper portion thereof with support means for supporting the structure so as to be rotatable in a horizontal plane and freely tilted three-dimensionally. A bearing according to any one of the preceding claims. 8. The bearing body according to claim 1, wherein the outer shell is provided with a transparent window that opens into the rolling element housing space.