JPS636501Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a casing for an infinite linear motion roller bearing in which a casing that straddles a linear track rail can perform infinite linear motion via a large number of rollers that circulate infinitely within the casing. This relates to a side plate that is attached to the front and rear of the side plate, and the side plate is divided into an upper member and a lower member at the direction change path in order to facilitate the formation of a direction change path consisting of a complex three-dimensional curved surface bored inside the side plate. The two members are molded separately, and the finished members are accurately and reliably joined, and the direction change path of the side plate is connected to a load track formed vertically parallel to the direction of movement of the casing in the endless circulation path. It is an object of the present invention to provide a side plate in which a turning path is formed with a complicated three-dimensional curved surface that can be connected to both ends of a straight path with a return path at an accurate position.

Conventional infinite linear roller bearings have a large number of rollers that are held in a link chain cage and connected together, but in order to increase the load capacity of the roller bearing, the number of rollers has been increased. A system has been devised in which adjacent cylindrical rollers having approximately square axial cross-sections with approximately equal diameters and heights are directly adjacent to each other and installed in an endless circulation path without having the cage. Ta. As shown in FIG. 8, the endless circulation path is a linear load track 3 formed between the track rail 2 and the casing 1 in the direction of movement of the casing 1.
, a linear return path 4 formed parallel to the load track 3, and a semicircular arc-shaped direction change path 6 provided at both ends of the straight paths 3, 4 so that the roller 5 can smoothly change direction. However, the respective axes of the straight paths 3, 4 and the two-way switching paths 6, 6, which have a substantially square cross section, are perpendicular to the facing surfaces 7, 8 of the track rail 2 and the casing 1. are on the same plane P, and both the formation of the direction change path 6 and the side plates on which the direction change path 6 is formed were easy to manufacture.

In the present invention, as shown in FIG. 7, the return path 4 protruding from the casing 1 is connected to the load track 3 formed between the facing surface 7 of the track rail 2 and the facing surface 8 of the casing 1. The facing surfaces 7 and 8
The width B of the casing 1 can be made smaller by providing it at a higher position than the perpendicular direction on the load track 3, but as a result, the endless circulation path of the rollers 5 is a straight path. Load track 3
A direction changing path 6 connecting both ends of the return path 4 and allowing the roller 5 to roll smoothly while changing direction between the straight paths 3 and 4 is formed by a semicircular arc-shaped surface when projected on a horizontal plane. As shown in FIG. It has become extremely difficult to manufacture the side plates 9, 9 in which the turning path 6 is bored.

The fixing bolts 10 and other fixing devices for fixing the side plate 9 to the front and rear end faces of the casing 1 are installed at positions that are suitable for infinite linear motion roller bearings in which the rollers 5 rolling on the endless circulation path can smoothly circulate endlessly. It should not be located in a position that would interfere with the basic functions of the side plate 9, and should be located in an appropriate empty space that can maximize the adhesion force of the side plate 9 to the casing 1, and that is located away from the three-dimensional arc-shaped turning path 6. It must be. Once the problem of selecting the position of the fixing bolt 10 on the side plate 9 is solved, the direction change path 6 and the load track 3, and the direction change path 6 and the return path 4 are then solved.
In particular, the rollers 5, which have been rolling under load on the load track 3, can be smoothly transferred to the direction change path 6, and smoothly sent to the return path 4. It is necessary to accurately match the relative positions of both ends of the direction change path 6 of the side plate 9 with the load track 3 and the relative position with the return path 4.

The present invention allows easy and accurate production of the side plate 9 in which the direction change path 6 having a three-dimensional arc shape and a substantially square cross section as described above is formed correctly, and the rollers 5 can smoothly change direction in the direction change path 6. This is something that could have been done.

The present invention relates to an infinite linear motion roller bearing in which a casing straddled by a linear track rail can perform infinite linear motion via a large number of rollers circulating infinitely within the casing. In the endless circulation path of the bearing, a direction change path is drilled to connect both ends of the load track and the return path, which are at different heights. In the traveling direction of the casing, along the axis of the direction change path, which also corresponds to the rolling locus of the center of a roller whose diameter and height are approximately the same, rolling in the direction change path, which is approximately square, That is, it is divided into an upper member and a lower member along an arcuate plane that is a projection of the axis on a plane perpendicular to the direction of travel of the axis, and the upper member and the lower member are The side plates of an infinite linear motion roller bearing are configured to be connected to each other by side plate assembly bolts having axes that intersect with the center line of curvature of the surfaces, and the configuration thereof will be explained below with reference to the drawings.

In the infinite linear motion roller bearing shown in the embodiment shown in FIGS. 6 and 7, a casing 1 that straddles a linear track rail 2 has a load track 3 formed in the casing 1, a return path 4, and It is possible to perform infinite linear motion on the track rail 2 via a large number of rollers 5 that circulate endlessly on an endless circulation path made up of direction change paths 6, 6. The load track 3 is a straight path formed between the vertical facing surface 7 of the track rail 2 and the vertical facing surface 8 of the casing 1, and the return path 4 is parallel to the load track 3, It is bored in the casing 1 diagonally above the load track 3. Direction change paths 6, 6 connecting the ends of the load track 3 and return path 4, which are both straight paths, are formed in side plates 9, 9 attached to the front and rear end surfaces of the casing 1, respectively.

Each of the load track 3, the return path 4, and the direction change paths 6, 6 has a substantially square cross section, and has a large number of adjacent rollers 5, with substantially equal diameters and heights.
5 are arranged with their axes at right angles, as shown in FIG. 6, so that they can roll and circulate endlessly.

In order to accurately form the direction change path 6 in the shape of a three-dimensional circular arc, the side plate 9 also corresponds to the rolling locus of the center of the roller 5, which rolls in the direction change path 6 and has approximately the same diameter and height. The upper member 12 and the lower member 13 are attached to the upper member 12 and the lower member 13 along the axis of the direction change path 6 in the traveling direction of the casing 1, that is, along the arcuate surface 11 that is the projection of the axis onto a plane perpendicular to the traveling direction of the axis.
It is divided.

As shown in FIGS. 1 to 3, the upper member 12
and the lower member 13 are properly connected to each other by a side plate assembly bolt 15 having an axis in a direction intersecting the center line of curvature 14 of the arcuate surface 11. The number of side plate assembly bolts 15 may be one as shown in FIGS. 1 and 2, but when there are multiple bolts as shown in FIG. 3, the upper member 12 and lower member 1 can be more accurately and firmly attached.
3 are combined.

Note that the side plate 9 has fixing holes 1 into which the fixing bolts 10 fixed to the casing 1 are inserted as described above.
6 and 16 are bored in positions that do not interfere with the direction change path 6, and as shown in FIGS. Holding plate mounting holes 18, 18 are provided in which the holding plate 17 is mounted to hold the holding plate 17 to prevent it from coming off.

The upper member 12 and the lower member 13 that are in contact with each other on the arcuate surface 11 are screwed together by the side plate assembly bolts 15 whose axes intersect with the center line of curvature 14, which is faster than conventional assembly methods. The assembly error of the direction change path 6 formed on the side plate 9 after assembly is small, and therefore the rollers 5 can roll more smoothly in the direction change path 6, and the direction change path 6 of the side plate 9 can be reliably formed. It becomes possible to form

When the infinite linear motion roller bearing becomes large and the moving distance of the rollers 5 on the direction change path 6 in the side plate 9 becomes long, as shown in Fig. 3, the side plate assembly bolt 1
By using two or more 5, the upper member 12 and the lower member 13 can be accurately and reliably connected.

In addition, as shown in Fig. 1, Fig. 3, and Fig. 4,
The casing 1 and the side plate 9 are arranged concentrically with the center line of curvature 14.
Pin mounting holes 20 and 21 into which the mounting pin 19 is inserted are respectively drilled in the abutting surfaces of the side plate 9 and the casing 1 by fitting the mounting pin 19 into the pin mounting holes 20 and 21. It becomes possible to determine the mounting position correctly, and therefore to more reliably position the abutting ends of the load track 3 and the return path 4 and the direction change path 6.

In the above-mentioned embodiment, the side plate is described in the case where the return path is provided at a higher position than the load track, and the side plate has a direction change path for the endless circulation path. It goes without saying that the side plates in such a case may also have a similar configuration.

The present invention has the configuration described in the claims for utility model registration, whereby both the load track and the return track, which are straight tracks provided in parallel at different heights in an infinite linear motion roller bearing, are parallel to each other. The side plate, which connects both ends of the path and forms a three-dimensional arc-shaped direction change path that allows the rollers to change direction smoothly, is divided into two by an arcuate surface in the direction of movement of the casing along the axis of the direction change path. It is formed by an upper member and a lower member, and the upper member and the lower member are connected by a side plate assembly bolt having an axis that intersects the center line of curvature of the arcuate surface. It is now possible to accurately form a direction change path with a complex shape, assemble it in the correct position, and assemble the assembled side plate more accurately than before, and to make the rolling of the rollers rolling in the direction change path smoother. In addition, it becomes possible to maintain the end face positions of the direction change path, load track, and return hole more accurately, making it possible to easily and accurately manufacture the side plates, reducing production costs, shortening assembly time, This is an idea that has various effects that improve assembly accuracy and also make it possible to realize an infinite linear motion roller bearing with less frictional resistance.

[Brief explanation of the drawing]

Figure 1 is an elevational view of an embodiment of the side plate, Figure 2 is an elevational view of the embodiment of the side plate.
A side view in the direction of the arrow in the figure, FIG. 3 is an elevation view showing a partial cross section of another embodiment of the side plate, FIG. 4 is a partial cross section view of the pin mounting hole, and FIG. 5 is a partial cross section view of the fixing bolt.
Fig. 6 is a side view showing the left half of the embodiment of the infinite linear motion roller bearing taken along the line - 7 in Fig. 7; FIG. 8 is an elevational sectional view of a conventional example. 1: Casing, 2: Track rail, 3: Load track, 4: Return path, 5: Roller, 6: Direction change path, 9: Side plate, 11: Arc-shaped surface, 12: Upper member, 13: Lower member, 14 : Curvature center line, 15: Side plate assembly bolt.

Claims (1)

[Scope of utility model registration request] A load track with different heights of an infinite circulation path of an infinite linear motion roller bearing in which a casing that is straddled over a linear track rail can perform infinite linear motion via a large number of rollers that circulate infinitely within the casing. A turning path connecting both ends of both parallel straight paths of the and return path is bored, and side plates attached to the front and rear of the casing are circular in the direction of movement of the casing along the axis of the turning path, which has a substantially square cross section. It is divided into an upper member and a lower member by an arcuate surface, and the upper member and the lower member are connected to each other by a side plate assembly bolt having an axis that intersects the center line of curvature of the arcuate surface. A side plate of an infinite linear motion roller bearing, characterized by: