JPH0355694B2 - - Google Patents

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. Regarding angular type linear sliding bearings.

[Conventional technology] Conventionally, as this type of linear sliding bearing,
a bearing block having a pair of adjacent ball raceway surfaces and a no-load ball passage corresponding to each ball raceway; A cover body that connects both ends of the no-load ball passage to form a pair of endless tracks, a large number of balls that roll within each of the endless tracks, and each ball that rolls on the rolling surface of the bearing block. It consists of a track rail having a pair of ball rolling grooves in which each ball rolls while applying a load.For example, one set is installed on each side of the table, and two sets are combined to move the ball in the radial direction, reverse radial direction, and An angular type linear sliding bearing is known which is used to apply loads in four directions in the 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 ball is used.
It is installed between a pair of lid bodies so that each of the elongated holes is located along each ball rolling surface of the bearing block, thereby preventing balls rolling on each ball rolling surface of the bearing block from falling off. The aim is to prevent this and improve workability when assembling it into a table, etc.

This angular type linear sliding bearing is
It is possible to construct a compact, low-profile and stable linear guide mechanism, and it is easy to adjust the distance, and the preload can be increased to increase rigidity, or the preload can be lowered to improve light sliding. It has many features such as the ability to obtain dynamic motion.

[Problems to be Solved by the Invention] However, in the conventional angular type linear sliding bearing described above, the ball retainer is formed by press-forming a thin metal plate, and A long hole is formed over almost the entire length, and only both ends of the hole are attached to the pair of lids. For this reason, this ball holder is particularly vulnerable to torsion, lacks its own strength and rigidity, and is easily deformed, causing warping and the width of the elongated hole to be misaligned, making it difficult to process accurately. In addition to being difficult, even when machined with high precision, it is easy to go wrong due to deformation, and contact with the ball may occur during use, causing noise or impeding smooth sliding movement. Assembling the ball holder and each lid also requires accurate positioning between these three parts, which has to be done manually, and there is a problem in that it is difficult to automate the bearing assembly.

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 holder 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 having a bearing block; a lid body attached to both front and rear end surfaces of the bearing block and connecting both ends of each of the ball rolling surfaces and each no-load ball passage to form a pair of endless tracks; An angular roller 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 wide groove is formed on one side of the bearing block, and the ball rolling surface is formed at the upper and lower corners of this groove, while a longitudinal groove is formed in the center of the groove. By carving a dovetail groove along the dovetail groove and fitting a partition member into the dovetail groove to divide the groove into two,
This is an angular type linear sliding bearing characterized by forming a pair of load ball grooves whose opening width is at least smaller than the diameter of the balls.

[Function] According to the present invention, a pair of ball rolling surfaces are formed at the upper and lower corners of the groove formed in the bearing block, and a dovetail groove is formed along the longitudinal direction of the center of the groove. By fitting the partition wall member,
A loaded ball groove whose opening width is smaller than the ball diameter is formed to cover a ball (loaded ball) rolling on a ball rolling surface, and the ball is held by a bearing block. At this time, since the position of the partition member in the groove is uniquely determined by the position of the dovetail groove, the opening width of the load ball groove does not change when the bearing is used. Therefore, when the bearing is used, it is possible to completely prevent the load ball from coming into contact with the peripheral member for holding the ball.

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

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

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 is attached to both the front and rear end surfaces of the bearing block 1, and the two ends of each ball rolling surface 6 and each no-load ball hole 7 are connected in communication with each other to form a pair of endless tracks. A lid body 2 to be formed, a large number of balls 3 rolling in each of the endless tracks, and a pair of balls 3 rolling on each ball rolling surface 6 of the bearing block 1 while being loaded with a load. The track rail 4 has a ball rolling groove 8.

In this embodiment, each load ball groove 5 of the bearing block 1 is
It is formed by a wide groove 20 formed by cutting and/or grinding on one side of the groove 20, and a partition member 5b attached along the longitudinal direction of the center of the groove 20. The partition member 5b is a bar member having a trapezoidal cross section, and is integrated with the bearing block 1 by fitting into a dovetail groove cut in the center of the groove 20.

Further, as shown in FIGS. 1 to 6, this bearing block 1 is provided with a mounting hole 9 that passes through the bearing block 1 in the vertical direction and into which a mounting bolt is inserted when assembling it into a table or the like. The above-mentioned lid body 2 is provided on both end surfaces of the lid body 2.
Mounting screw hole 10 for attaching the lid body 2
A pair of fixing holes 11 are formed to be used for positioning.

In addition, each lid body 2 attached to both the front and rear ends of this bearing block 1 is connected to each load ball formed on the side of the bearing block 1, as shown in FIGS. 1, 4, and 7 to 10. It has a ball circulation path 12 for forming an endless track by connecting each end of the groove 5 and each end of each non-load ball hole 7 corresponding to each loaded ball groove 5 to form an endless track. The lid main body 2a has two semicircular slots 13 at the top, and the lid main body 2a is formed into a substantially semicircular shape, and the peripheral edge of the lid body 2a has a semicircular area around which the ball 3 circulates in conjunction with the peripheral edge of the slot 13. It has a circumferential groove 14 that forms a ball circulation path 12, and is composed of a radius piece 2b that is fitted into the center of each slot 13 of the lid body 2a. The installation of each lid body 2 involves fitting the R piece 2b into the center of each slot 13 of the lid main body 2a, and inserting a pair of protrusions 15 protruding from each R piece 2b onto both the front and rear ends of the bearing block 1. The insertion holes 16a, which are fitted into and positioned in the respective stopper holes 11 formed in the portion, and then penetrate through approximately the center portions 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 holes 10 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 ball rolling grooves 8 formed in one shoulder thereof corresponding to each ball rolling surface 6 of the bearing block 1. The track rails 4 are placed at a predetermined distance from each other.
A mounting bolt insertion hole 18 for fixing the device to a mechanical device such as a bed is provided.

Next, FIG. 11 shows a modification of the load ball groove 5 formed in the bearing block 1. As shown in FIG. In this modification, an open groove 20a having a relatively wider opening width than the groove 20 of the above embodiment is formed on one side of the bearing block 1, and the bearing block 1 in which the open groove 20a is formed is formed.
A pair of ball holding plates 19a and 19b are attached to one side surface by welding such as projection welding or fixing means such as screws so as to cover a part of the open groove, thereby forming a concave groove 20. ing. According to this modification, heat treatment such as grinding and hardening of the ball rolling surface can be performed on the open groove 20a with a wide opening width, and these machining and treatments can be applied to the concave groove 20 with a relatively narrow opening width. This can be carried out more easily and accurately than in the above embodiments.

[Effects of the Invention] As explained above, according to the angular type linear sliding bearing of the present invention, the partition member is fitted into the groove formed in the bearing block, so that the opening width is at least larger than the ball diameter. By forming a small load ball groove, it is possible to completely prevent the load ball from coming into contact with the surrounding parts used to hold the ball when using the bearing, which not only allows for smooth sliding movement, but also reduces noise generation. can be effectively prevented.

In addition, since the bulkhead member is fitted to the bearing block by a dovetail groove, the troublesome positioning process required for conventional ball retainers can be omitted, and the assembly of the bearing is easy and can be automated. It becomes possible.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an angular type linear sliding bearing according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is an enlarged view of the main part of Fig. 2. Enlarged sectional view, Figure 4 is - of Figure 2.
Fig. 5 is a front view of the bearing block, Fig. 6 is a partially sectional side view of Fig. 5, Fig. 7 is a partially sectional view of the bearing block.
The figure is a back view of the lid, Figure 8 is a sectional view taken along the - line in Figure 7, Figure 9 is a sectional view taken along the - line in Figure 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 type 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, 5b... Partition member, 6...
Ball rolling surface, 7... No-load ball hole (no-load ball passage), 8... Ball rolling groove, l... Opening width,
d...Ball diameter, 19a, 19b...Ball holding plate, 20...Concave groove.

Claims (1)

[Scope of 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; A cover body is attached to both the front and rear end surfaces and connects both ends of each of the ball rolling surfaces and each no-load ball path to form a pair of endless tracks, and a large number of covers that roll within each of the endless tracks An angular type linear sliding bearing comprising a ball 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, the bearing as described above. A wide groove is formed on one side of the block, and the ball rolling surface is formed at the upper and lower corners of this groove, while a dovetail groove is carved along the longitudinal direction in the center of the groove. An angular type linear sliding bearing characterized in that a partition member is fitted into the dovetail groove to divide the concave groove into two, thereby forming a pair of load ball grooves each having an opening width at least smaller than the diameter of the ball. . 2. The angular type linear sliding bearing according to claim 1, wherein a wide groove is formed by attaching a pair of opposing ball holding plates to the bearing block.