JPH03144112A - Angular type straight-slide bearing - Google Patents

Abstract

PURPOSE:To achieve smooth side motion and prevent noise from occurring as much as possible by forming a bulkhead on a bearing block while attaching a pair of ball supporting plates to form a pair of load ball grooves therein. CONSTITUTION:A bearing block 1 is provided with a bulkhead 5a between a pair of ball rolling faces 6 along a longitudinal direction of the center portion thereof. A pair of ball supporting plates 19a, 19b facing to the bulkhead 5a in sandwich of the respective ball rolling faces 6 are attached. A pair of load ball grooves 5 with the opening widths being at least smaller than the dia. of a ball 3 are formed by the bulkhead 5a and the ball supporting plate 19. In is thus possible to achieve smooth slide motion and prevent noise from occurring as much as possible.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is used for linearly guiding a movable body to be moved in a sliding part of a machine tool such as an NC machine or an industrial robot. Related to angular type linear sliding bearings.

[Prior Art] Conventionally, this type of linear sliding bearing includes a bearing block having a pair of adjacent ball rolling surfaces and a no-load ball passage corresponding to each ball rolling surface, and the above-mentioned bearing block. a lid body attached to both the front and rear end surfaces of the ball rolling surface and each end of each no-load ball path to form a pair of endless tracks; and a track rail having a pair of ball rolling grooves in which each ball rolling on each ball rolling surface of the bearing block rolls while applying a load, for example, one on each side of the table. Angular type linear sliding bearings are known which are installed in sets and used in combination to apply loads in four directions: radial direction, reverse radial direction, and left and right directions.

In such an angular type linear sliding bearing, a ball retainer having a pair of elongated holes whose width dimension is slightly narrower than the diameter of the balls is used, and each elongated hole is connected to each ball rolling surface of the bearing block. It is installed between a pair of lid bodies so as to be located along the bearing block.This prevents the balls rolling on the ball rolling surface of the bearing block from falling off, and improves workability when assembling it into a table, etc. .

This acicular type linear sliding bearing can construct a compact, low-profile and stable linear guide mechanism. Moreover, the gap can be easily adjusted, and the preload can be increased to increase rigidity. It has many features such as being able to lower the height and obtain light sliding motion.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional angular type linear sliding bearing, the ball retainer is formed by press-forming a thin metal plate, and its longitudinal An elongated hole is formed over substantially the entire length in the direction, and only both ends thereof are attached to the pair of lids.

For this reason, this ball retainer is particularly vulnerable to torsion, and easily deforms due to its own lack of strength and rigidity.
It has drawbacks such as warping and irregularities in the width of the elongated hole. Furthermore, since a pair of long holes are punched in different directions into two metal plates, the pitch between these long holes tends to be off, and there is also the drawback that the long holes do not correspond accurately to the rows of balls. do. For the above reasons, in bearings that use ball cages as described above,
During use, the cage and balls may come into contact, causing noise or interfering with smooth sliding movement.
Assembling the ball holder and each cover to the bearing block requires accurate positioning between these three parts, and must be done manually, which poses the problem of difficulty in automating bearing assembly. Ta.

In addition, as a means for holding the balls without using such a ball holder, as shown in Japanese Patent Publication No. 61-46682, a tongue section provided on a bearing plate holds a row of balls from both sides. However, in order to grind the ball raceway surface, these tongues are formed by caulking the corresponding parts of the plate after the ball raceway surface has been processed, so the height is not high. It is extremely difficult to mold with precision. Therefore, even with this method, it is impossible to avoid contact between the ball and the tongue, but it is not possible to avoid generation of noise or obstruction of sliding movement.

Therefore, the present inventor conducted various research on means to prevent the balls from falling off the ball rolling surface of the bearing block even if the track rail is separated from the bearing block without using the ball retainer as described above. As a result, we have arrived at the present invention.

[Means for Solving the Problems] That is, the present invention has a pair of ball rolling surfaces that are adjacent to each other and face in mutually convergent directions, and has an unloaded ball path that corresponds to each of these ball rolling surfaces. a bearing block, which is attached to both the front and rear end surfaces of the bearing block, and which communicates and connects both ends of each of the ball rolling surfaces and each of the no-load ball passages to form a pair of endless tracks; An angular track rail consisting of a large number of balls rolling in an endless track and a track rail having a pair of ball rolling grooves in which each ball rolling on each ball rolling surface of the bearing block rolls while applying a load. - In the linear sliding bearing, the bearing block has a partition formed along the longitudinal direction of the center between the pair of ball rolling surfaces, and the partition wall is sandwiched between each ball rolling surface. This is an angular type linear sliding bearing in which a pair of ball holding plates facing each other are attached, and a pair of loaded ball grooves having an opening width smaller than at least the diameter of the balls are formed by these partitions and the ball holding plates.

[Function] According to the present invention, a partition is formed in the bearing block, and a pair of ball retaining plates are installed that face the partition with each ball rolling surface in between, so that the opening width is at least as large as the ball diameter. A smaller load ball groove is formed to cover the ball (load ball) transferring each ball rolling surface, and the ball is held in the bearing block.

At this time, since only one end of each of the ball holding plates facing the partition wall contributes to holding the ball, the width of the plate can be made extremely compact, and the conventional ball holding plate with elongated holes can be It has improved strength and rigidity compared to a cage, and is less likely to deform.

In addition, each load ball groove is formed by attaching each ball holding plate that is positioned with respect to a partition wall formed at the center of the ball rolling surface, so unlike a conventional ball holder, the ball holding plate is There is no problem of not accurately corresponding to the long holes or ball rows.

Therefore, it is possible to prevent the load balls from coming into contact with the ball holding plate during use of the bearing.

[Example] Hereinafter, the acicular type linear sliding bearing of the present invention will be specifically described based on the example shown in the accompanying drawings.

1 to 4, an angular type linear sliding bearing according to an embodiment of the present invention is shown.

This linear sliding bearing has a pair of load ball grooves 5 which are adjacent to each other and open in directions converging to each other, and each of which has an opening width l smaller than at least the diameter d of the ball. 5 has a pair of ball rolling surfaces 6 facing in the same direction as the opening direction of each of these loaded ball grooves 5, and a pair of unloaded ball holes (unloaded ball holes) corresponding to each of these ball rolling surfaces 6. a bearing block 1 having a passageway) 7;
A cover body 2 is attached to both the front and rear end surfaces of the ball rolling surface 6 and the two ends of each no-load ball hole 7 to form a pair of endless tracks. A large number of running balls 3 and the bearing block l
The track rail 1 has a pair of ball rolling grooves 8 in which each ball 3 rolling on each ball rolling surface 6 rolls while being loaded with a load.

In this embodiment, the load ball groove of the bearing block 1 is formed by cutting the bearing block 1 and, if necessary, grinding it to form two adjacent semicircular grooves each having a substantially semicircular cross section. A partition wall portion 5a is formed between these semicircular grooves, and a pair of ball holding plates 19a are attached to one side of the bearing block l in which the semicircular grooves are formed by welding such as projection welding or fixing means such as screws. , 19b, and a ball rolling surface 6 is formed in each semicircular groove facing the opening of the load ball groove 5.

Further, as shown in FIGS. 1 to 6, this bearing block 1 has a mounting hole 9 that passes through the bearing block 1 in the vertical direction and into which a bolt is inserted when installing it into a table or the like. A mounting screw hole lO is provided on each end surface side for mounting the lid body 2.
A pair of retaining holes 11 used for positioning the lid body 2
is formed.

Moreover, each lid body 2 attached to both the front and rear ends of this bearing block 1 is shown in FIGS. 1, 4, and 7 to 1.
As shown in Fig. O, each end of each load ball groove 5 formed on the bearing block l side and each end of each non-load ball hole 7 corresponding to each of these load ball grooves 5 are connected in communication. The lid body 2a has a ball circulation path 12 for forming an endless track, and has a lid main body 2a having two semicircular slots 13 on the inner surface side, and a lid main body 2a that is formed in a substantially semicircular shape and has the above-mentioned grooves on the periphery. It has a circumferential groove 14 that forms a semicircular ball circulation path 2 in which the balls 3 circulate in conjunction with the peripheral edge of the slot 13, and is fitted into the center of each slot 13 of the lid body 2a. It is composed of a R piece 2b that is worn. To install each of the lid bodies 2, the R piece 2b is fitted into the center of each slot 13 of the lid main body 2a, and a pair of protrusions 15 protruding from each R piece 2b are attached to both front and rear ends of the bearing block l. The insertion hole 16a is fitted into each stopper hole ll formed in the section for positioning, and then passes through approximately the center of the lid main body 2a and the R piece 2b.

This is done by inserting a set bolt 17 through the bearing block 16b and screwing it into the mounting screw hole lO formed at both the front and rear ends of the bearing block 1, and then tightening the set bolt 17.

Furthermore, as shown in FIGS. 1 to 3, the track rail 3 has the bearing block 1 attached to one shoulder thereof.
Ball rolling grooves 8 corresponding to each other are formed on each ball rolling surface 6 of the ball rolling surface 6, and mounting bolt insertion holes for fixing the track rail 4 to a mechanical device such as a bed are provided at a predetermined interval from each other. 18 are drilled.

Next, FIG. 11 shows a modification of the load ball groove 5 formed in the bearing block 1, in which a wide groove 20 is formed on one side of the bearing block 1, and the upper and lower sides of this groove 20 are A pair of ball rolling surfaces 6 are formed at the corner portions, while a partition wall member 5b is attached to the central portion along the elongated direction, and a pair of ball holding plates 1 same as in the first embodiment are provided.
Each load ball groove 5 is formed by attaching the bearing block I to the bearing block I. According to this modification, grinding of the ball rolling surface 6 using a grindstone or the like and heat treatment such as hardening can be performed more easily and accurately than when the partition wall portion is formed by cutting into the bearing block.

[Effects of the Invention] As explained above, according to the angular type linear sliding bearing of the present invention, a pair of ball holding plates are placed between each ball rolling surface with respect to the partition formed in the bearing block. By installing a load ball groove and forming a load ball groove whose opening width is at least smaller than the ball diameter, it is possible to prevent the load ball from coming into contact with the ball holding plate while the bearing is in use, thereby achieving smooth sliding movement. Also, the generation of noise can be prevented as much as possible.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view of an angular linear sliding bearing according to a first embodiment of the present invention, and a third
The figure is a partially enlarged sectional view showing the main part of Figure 2, and Figure 4.
The figures are a partial cross-sectional view taken along the line IV-IV in Figure 2, Figure 5 is a front view of the bearing block, Figure 6 is a partial cross-sectional side view of Figure 5, Figure 7 is a back view of the lid, and Figure 8 is a partial cross-sectional view of the bearing block. The figure is a sectional view taken along the line ■-■ of Fig. 7, and Fig. 9 is a sectional view taken along the line IX-IX of Fig. 8.
The figure is a perspective view of the R piece, and FIG. 11 is a sectional view similar to FIG. 3 showing an angular linear sliding bearing according to a modified example. [Explanation of symbols] (1)... Bearing block, (2)... Lid body,
(3) Ball, (4) Track rail, (5)
... Load ball groove, (5a) ... Partition part, (5b)
...Partition member, (6>...Ball rolling surface, (7
)...No-load ball hole (no-load ball passage), (8)
... Ball rolling groove, (1) ... Opening width, (d) ...
- Ball diameter, (19a, 19b)...Ball holding plate, (20)...Concave groove.

Claims (2)

[Claims] (1) A bearing block having a pair of ball raceway surfaces adjacent to each other and facing in directions converging with each other, and having an unloaded ball passage corresponding to each of these ball raceway surfaces, and a bearing block having a pair of ball raceway surfaces adjacent to each other and facing in converging directions, and a bearing block having an unloaded ball passage corresponding to each of these ball raceway surfaces; a lid body that is attached and connects both ends of each of the ball rolling surfaces and each of the no-load ball passages to form a pair of endless tracks; a large number of balls that roll within each of the endless tracks; In an angular type linear sliding bearing consisting of a track rail having a pair of ball rolling grooves in which each ball rolling on each ball rolling surface of the bearing block rolls while applying a load, the bearing block has the following features: A partition is formed along the longitudinal direction of the center between the pair of ball rolling surfaces, and a pair of ball holding plates are installed opposite to the partition with each ball rolling surface in between. An angular type linear sliding bearing characterized in that a pair of load ball grooves having an opening width smaller than at least the diameter of the balls are formed by a ball holding plate and a ball holding plate. (2) The angular bearing according to claim 1, wherein the partition part is a partition member attached to the bearing block along the longitudinal direction of the center between the pair of ball rolling surfaces. Type linear sliding bearing.