JPH03144113A - Angular type straight-slide bearing - Google Patents

Abstract

PURPOSE:To prevent noise from occurring as much as possible and perform automatic bearing assembly by forming a pair of load ball grooves in a bearing block and forming ball rolling faces inside the respective load ball grooves. CONSTITUTION:A bearing block 1 is provided with a pair of load ball grooves which open to such a direction that they are neighbored and converged with each other and have smaller opening widths as least than the dia. of a ball 3. Ball rolling faces 6 are provided inside the load ball grooves 5, respectively. The ball 3 which rolles on each ball rolling face 6 of the bearing block 1 is prevented from falling. It is thus possible to prevent noise from occurring as much as possible, make bearing assembly easy and perform its automatization.

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 angular 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 achieve light sliding motion with low preload.

[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 holder is particularly susceptible to torsion, lacks its own strength and rigidity, and is easily deformed, causing warping and misalignment of the width layer of the long hole, making it difficult to process accurately. In addition, even if the bearing block is machined with high precision, it is easily distorted 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 members, and must be done manually, which poses a problem in that it is difficult to automate 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 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. - type linear sliding bearing, in which a pair of load ball grooves are formed in the bearing block, which are adjacent to each other and open in directions converging to each other, and each of which has an opening width smaller than the diameter of the ball; This is an angular type linear sliding bearing with a ball rolling surface formed inside the load ball groove.

In the present invention, the means for forming each load ball groove in the bearing block may be, for example, cutting and grinding, or electrical discharge machining suitable for machining more complex shapes. good.

[Function] According to the present invention, each load ball groove formed in the bearing block has a ball rolling surface therein, and the opening width thereof is formed to be smaller than the diameter of the ball. Even when this bearing block is separated from the bearing block, the balls in each load ball groove will not fall out. There is no need to use a ball retainer that can be attached, and it is possible to form and assemble the bearing with high precision, and it is also possible to automate the assembly of the bearing.

[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, 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 l having a passageway) 7; and the bearing block 1
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 4 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, each load ball groove 5 of the bearing block l is formed directly on the bearing block l by cutting and, if necessary, grinding. As shown in Figures 6 to 6, mounting holes 9 are drilled through the bearing block 1 in the vertical direction, into which bolts are inserted when installing it into a table, etc., and on both end faces thereof. A mounting screw hole IO for attaching the lid 2 and a pair of fixing holes 11 used for positioning the lid 2 are formed, respectively.

In addition, each lid body 2 attached to both the front and rear ends of this bearing block l is shown in FIGS.
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 12 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 the R piece 2b. 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. Then, a stopper hole [7] is inserted into the insertion hole 16a, 16b penetrating approximately the center of the lid body 2a and the R piece 2b.
into the mounting screw holes lO formed at both the front and rear ends of the bearing block l, and then tighten the fixing bolts 17.
This is being carried out with strict regulations.

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.

[Effects of the Invention] According to the angular type linear sliding bearing of the present invention, the balls rolling on each ball rolling surface of the bearing block can be easily controlled without using a ball retainer installed between a pair of lids. This prevents the ball holder from falling off, and the installation error when attaching the pair of lids to the bearing block and the installation error when installing the ball holder between the pair of lids overlap. This eliminates problems such as large installation errors, achieves smooth sliding motion, prevents noise as much as possible, and facilitates assembly of bearings. It also becomes possible to automate this process.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an angular linear sliding bearing according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an enlarged view of the main part of Fig. 2. 4 is a partial sectional view taken along line IV-■ in FIG. 2, FIG. 5 is a front view of the bearing block, FIG. 6 is a partially sectional side view of FIG. 5, and FIG. is the back view of the lid, and Figure 8 is the ■ in Figure 7.
-■ cross-sectional view, Figure 9 is a cross-sectional view taken along line IX-IX in Figure 8,
FIG. 1O is a perspective view of the R piece. [Explanation of symbols] l>... Bearing block, (2)... Lid, 3
)...ball, (4)...track rail, 5)
... Load ball groove, (6) ... Ball rolling surface, 7
)...No-load ball hole (no-load ball passage), 8)
... Ball rolling groove, (f) ... Opening width, d) ... Ball diameter.

Claims (1)

[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 rolls on each ball rolling surface of the bearing block while applying a load, the bearing block has a A pair of load ball grooves are formed that are adjacent to each other and open in directions converging to each other and each opening width is smaller than at least the diameter of the ball, and a ball rolling surface is formed inside each of these load ball grooves. An angular type linear sliding bearing featuring: