JP2503104B2 - Angular type linear sliding bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is used for linearly guiding a movable body to be moved in a slide part of a machine tool such as an NC machine or an industrial robot. The present invention relates to angular type linear sliding bearings.

[Prior Art] Conventionally, as a linear sliding bearing of this type, a bearing block having a pair of ball rolling surfaces adjacent to each other and an unloaded ball passage corresponding to each ball rolling surface, and the above bearing block And a lid that is attached to both front and rear end surfaces of the ball rolling surface and both ends of the unloaded ball passages to communicate with each other to form a pair of endless tracks, and a number of rollers rolling in the 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, 1 on each side of the table. Angular used by mounting each set and combining two sets to apply a four-direction load in the radial direction, reverse radial direction, and left-right direction B-type linear sliding bearings are known.

In such an angular type linear sliding bearing, a ball cage having a pair of elongated holes whose width dimension is slightly narrower than the diameter of the ball is provided, and each elongated hole extends along each ball rolling surface of the bearing block. Is mounted between a pair of lids so as to prevent the balls rolling on each ball rolling surface of the bearing block from falling off and improve workability when assembled on a table or the like.

This angular type linear sliding bearing can form a compact and stable linear guide mechanism with low rigidity, and it is easy to adjust the clearance and increase the preload to increase the rigidity or the preload. It has many features such as a low sliding force and a light sliding motion.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional angular type linear sliding bearing, the ball cage is formed by press-molding a thin metal plate, and its longitudinal direction The long holes are formed over substantially the entire length, and only both ends thereof are attached to the pair of lids. For this reason, this ball retainer is particularly vulnerable to twisting, its strength and rigidity are insufficient, and it is apt to be deformed, resulting in warpage or deviation in the width dimension of the long hole. are doing. Further, since a pair of long holes are punched in different directions from one metal plate, the pitch between the long holes is apt to be misaligned and the long holes do not correspond accurately to the ball row. To do. For the above reasons, in the bearing using the ball retainer as described above, the retainer and the ball may come into contact with each other during use, which may cause noise or hinder smooth sliding motion. In addition, assembling of the ball retainer and each lid to the bearing block requires accurate positioning between these three members, which requires manual work, which makes automation of bearing assembly difficult. There was a problem.

Further, as a means for holding balls without using such a ball retainer, as shown in Japanese Patent Publication No. 61-46682, the tongue portion provided on the bearing plate holds the row of balls from both sides. However, since the tongue is formed by grinding the ball rolling surface, the tongues are formed by caulking the corresponding parts of the plate after the ball rolling surface is machined. Is extremely difficult to mold. Therefore, even with this means, contact between the ball and the tongue cannot be avoided,
The generation of noise and obstacles to sliding movements were unavoidable.

Therefore, the present inventor has conducted various studies on means for preventing balls from falling off from 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, the present invention has been reached.

[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 each other in a converging direction, and an unloaded ball passage corresponding to each ball rolling surface is provided. A bearing block, a lid body attached to the front and rear end surfaces of the bearing block, and a pair of endless tracks formed by connecting and connecting the ball rolling surfaces and the ends of the unloaded ball passages, respectively; Angular 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 type linear sliding bearing, a partition wall portion is integrally formed in the bearing block between the pair of ball rolling surfaces along the longitudinal direction of the central portion thereof. On the other hand, on both side surfaces of the partition wall, a pair of ball holding plates facing the respective side surfaces of the partition wall with the ball rolling surfaces sandwiched therebetween are mounted, and between the partition wall and the pair of ball holding plates. And a pair of loaded ball grooves each having an opening width smaller than at least the diameter of the ball.

[Operation] According to the present invention, a partition wall portion is integrally formed with the bearing block on the bearing block, and a pair of ball holding plates facing the partition wall portion with the ball rolling surfaces sandwiched therebetween are attached to form an opening. A load ball groove having a width at least smaller than the ball diameter is formed so as to cover the ball (load ball) transferring each ball rolling surface, and the ball is held by the bearing block.

At this time, since only one end portion of each of the ball holding plates facing the partition wall contributes to the ball holding, the width dimension thereof can be extremely compactly formed, and the ball holding device of the conventional type having the long hole is formed. The strength and rigidity are improved in comparison with the above, and deformation is less likely to occur.

Further, since each loaded ball groove is formed by attaching each ball holding plate positioned along the central portion longitudinal direction of the pair of ball rolling surfaces with respect to the partition wall portion formed integrally with the bearing block, Not only is the positional relationship between each side of the partition wall and each ball rolling surface accurate, but the positional relationship between each ball rolling surface and each ball holding plate is also accurate, resulting in accurate Since the loaded ball groove is formed, the problem that the long hole for holding the ball does not correspond exactly to the row of balls unlike the conventional ball holder does not occur.

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

[Embodiment] An angular linear sliding bearing of the present invention will be specifically described below based on an embodiment shown in the accompanying drawings.

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

This linear sliding bearing has a pair of load ball grooves 5 that are adjacent to each other and open in a direction in which they converge with each other, and each opening width 1 thereof is at least smaller than 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 the loaded ball grooves 5, and further, each ball rolling surface 6
A bearing block 1 having an unloaded ball hole (unloaded ball passage) 7 corresponding thereto, and mounted on both front and rear end surfaces of the bearing block 1, and between the both ends of each ball rolling surface 6 and each unloaded ball 7. A lid body 2 which is connected to each other to form a pair of endless tracks, a large number of balls 3 rolling in the respective endless tracks, and the bearing block 1
Each ball 3 transferring each ball rolling surface 6 is composed of a track rail 4 having a pair of ball rolling grooves 8 rolling while applying a load.

In this embodiment, the loaded ball groove of the bearing block 1 is formed by cutting the bearing block 1 and optionally grinding it to form two semicircular grooves having a substantially semicircular cross section adjacent to each other. A partition wall 5a is formed between these semi-circular grooves, and a pair of ball holding plates is formed on one side surface of the bearing block 1 in which the semi-circular grooves are formed by welding such as projection welding or fixing means such as screws.
It is formed by attaching 19a and 19b, and a ball rolling surface 6 is formed in each semicircular groove so as to face the opening of the loaded ball groove 5.

Further, as shown in FIGS. 1 to 6, the bearing block 1 is provided with a mounting hole 9 which penetrates the bearing block 1 in the vertical direction and into which a mounting bolt is inserted when the bearing block 1 is assembled into a table or the like. The mounting screw holes 10 for mounting the lid 2 are provided on both end surfaces thereof, respectively.
A pair of stopper holes 11 used for positioning the lid body 2 are formed.

Further, the respective lids 2 attached to the front and rear ends of the bearing block 1 are shown in FIGS. 1, 4, and 7 to 7.
As shown in FIG. 10, each end portion of each load ball groove 5 formed on the bearing block 1 side and each end portion of each unloaded ball hole 7 corresponding to each load ball groove 5 are connected and connected. Has a ball circulation path 12 for forming an endless track, and has a lid main body 2a having two semicircular grooved holes 13 on the inner surface side, and a semicircular disk-shaped lid body having the above-mentioned peripheral portion. This lid body has a circumferential groove 14 which forms a ball circulation path 12 in a semicircular portion in which the ball 3 circulates in cooperation with the peripheral portion of the groove hole 13.
It is configured with an earpiece 2b fitted in the central portion of each slot 13 of 2a. Then, the attachment of each of these lids 2 is carried out by fitting the R-piece 2b into the central portion of each slot 13 of the lid main body 2a,
A pair of protrusions 15 projecting from each R-piece 2b are fitted and positioned in the respective stop holes 11 formed in the front and rear end portions of the bearing block 1, and then the lid main body 2a and the R-piece 2b are substantially centered. The fixing bolt 17 is inserted into the through holes 16a, 16b penetrating through and is screwed into the mounting screw holes 10 formed at the front and rear end portions of the bearing block 1.
It is done with 17 tightened.

Further, as shown in FIGS. 1 to 3, the track rail 3 is provided with ball rolling grooves 8 corresponding to the ball rolling surfaces 6 of the bearing block 1 on one shoulder thereof. In addition, mounting bolt insertion holes 18 for fixing the track rails 4 to a mechanical device such as a bed are provided at predetermined intervals.

Next, FIG. 11 shows a modified example of the load ball groove 5 formed in the bearing block 1, in which a wide groove 20 is formed on one side surface of the bearing block 1.
While forming a pair of ball rolling surfaces 6 at the upper and lower corners of the 20, a partition member 5b is attached to the central portion along the longitudinal direction, and a pair of ball holding plates 19a, 19a, 19
By attaching b to the bearing block 1, each load ball groove 5 is formed. According to this modified example, as compared with the case where the partition wall portion is cut and formed in the bearing block, it is possible to easily and accurately perform heat treatment such as grinding and hardening of the ball rolling surface 6 with a grindstone or the like.

[Effects of the Invention] As described above, according to the angular linear sliding bearing of the present invention, a pair of ball rolling surfaces are sandwiched between a pair of partition walls integrally formed with the bearing block in the bearing block. By mounting the ball holding plate of and forming the load ball groove having an opening width at least smaller than the ball diameter, it is possible to prevent the load ball from contacting the ball holding plate during the use of the bearing.
In addition to achieving a smooth sliding motion, noise can be prevented as much as possible.

[Brief description of drawings]

FIGS. 1 and 2 are a perspective view and a sectional view of an angular type linear sliding bearing according to a first embodiment of the present invention, and FIG.
FIG. 4 is a partially enlarged sectional view showing an enlarged main part of FIG.
The drawing is a partial sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a front view of the bearing block, and FIG. 6 is a partial sectional side view of FIG.
7 is a rear view of the lid, FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 7, FIG. 9 is a sectional view taken along the line IX-IX of FIG. 8, and FIG. FIG. 11 is a sectional view similar to FIG. 3, showing an angular type linear sliding bearing according to a modification. [Description of Reference Signs] (1) ... Bearing block, (2) ... Lid, (3) ...
Ball, (4) ... Track rail, (5) ... Load ball groove,
(5a) ... Partition wall, (5b) ... Partition member, (6) ... Ball rolling surface, (7) ... Unloaded ball hole (unloaded ball passage),
(8) ... Ball rolling groove, (l) ... opening width, (d) ... ball diameter, (19a, 19b) ... ball holding plate, (20) ... concave groove.

Claims (1)

(57) [Claims] 1. A bearing block having a pair of ball rolling surfaces adjacent to each other and converging toward each other and having an unloaded ball passage corresponding to each ball rolling surface, and front and rear ends of the bearing block. A lid which is mounted on a surface and forms a pair of endless tracks by connecting and connecting the respective ball rolling surfaces and both ends of the respective unloaded ball passages, and a large number of balls rolling in the respective endless tracks. An angular 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 to the bearing block. Partition walls are integrally formed between the pair of ball rolling surfaces along the longitudinal direction of the central portion thereof, while the partition walls are respectively formed on both side surfaces. A pair of ball holding plates facing each side surface of the partition wall with the ball rolling surface sandwiched between them are attached, and the track rail is separated from the bearing block by the cooperation of the partition wall portion and the pair of ball holding plates. At this time, the balls located on both sides of the partition wall are prevented from falling out of the bearing block, and the angular type linear sliding bearing.