JPS60139912A - Roller type bearing for linear motion - Google Patents

Abstract

PURPOSE:To simplify the structure and also to prevent skewing of the roller by arranging a pair of roller circuits which are inclined against the raceway stand and also by making the end cap have a dual structure so that the upper and lower rollers are crossed in space for circulation. CONSTITUTION:A pair of roller circuits 3, 3' are formed between a raceway stand 1 and a bearing main body 2 inclined at an angle of 45 deg. against the raceway stand 1 towards the inside. A guiding side plate 5 is placed against the corner section R' of a roller R so that the roller is smoothly fed from an end surved surface 5' of the guiding side plate 5 into an end cap 6. The end cap 6, 6' formed at the end part of the bearing main body 2 has a dual structure and the circuits 3, 3' of the upper and lower rollers R are crossed in the space of the end cap 6, 6'. In this manner, the structure can be simplified and skewing of the roller can be avoided. Furthermore, moving capacity at high speed is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear motion bearing using rollers as rolling elements.

Linear motion bearings are bearings used to guide parts that move linearly in various machine tools, industrial robots, etc. Conventionally, balls were used as rolling elements between the track and the bearing body. There were many.

On the other hand, since the amount of elastic deformation of rollers is extremely small compared to balls, using rollers as rolling elements improves the load capacity, rigidity, etc. of the linear motion bearings. Various bearings of this type have been announced.

However, conventional roller type linear motion bearings not only have a complicated structure, but also have insufficient measures to prevent roller skewing, and therefore cannot operate satisfactorily at high speeds.

The present invention aims to eliminate the above-mentioned drawbacks of conventional devices, and provides a pair of circulation paths each inclined inward at an angle of 45 degrees with respect to the track in a cross section perpendicular to the axial direction, and an end cap. It is characterized by having a double structure so that the rollers on the upper and lower transfer surfaces are crossed in the space and circulated.

FIG. 1 is a cross-sectional view perpendicular to the axial direction of a roller type linear motion bearing to which the present invention is applied, and since it is symmetrical in this embodiment, only the right cross section is shown.

As shown in the same figure and FIG.
They are provided so as to be inclined at 45 degrees inward from each other.

FIG. 2 is a cross-sectional view of the portions constituting the load-side raceway of the bearing body 2, showing the hardened and polished raceway surfaces 2a and 2b of the bearing body 2, and the center block that has also been hardened and polished. Since the track surfaces 4a of 4 are combined to form a parallel roller path that precisely matches the longitudinal dimension of the roller R, there is no skewing when the rollers are transferred at high speed (i.e., the rollers transfer smoothly, with low running resistance and stability). You can have them do some exercise.

Next, an embodiment of the method of guiding the rollers when they return will be described. FIG. The curved surface 5' of the end portion 5 allows for smooth feeding into the end camp 6.

Next, FIG. 4 shows a second embodiment, in which a guide wire 7 is fixed to an end cap 6, and a curved portion 7' of the wire 7 smoothly feeds a roller R into an end camp 6. It is something.

By any of the above-mentioned guidance methods, J
Since the 13-dimensional roller can be used as is, ultra-high precision rollers can be easily obtained and used.

Moreover, according to this method, when the bearing body 2 is pulled out from the track base 1, the roller R is held by the bearing body 2 and does not fall off.

Furthermore, as shown in Figs. 3 and 5, the end camps 6 and 6' provided at the ends of the bearing body 2 have a double structure, and the circulation paths 3 and 3' of the upper and lower rollers are connected to this end cap. The parts 6.6' cross each other in space, which makes it easier to assemble because the upper and lower rollers can be assembled separately.

'Next, the space shown in FIG. 6 is a case where the roller type linear motion bearing according to the present invention is made into i Joule. If the track base 1' and the bearing body 2 are modularized as shown in the figure, these modules can be easily used as a bearing for a roller replacement im * * by screwing them to other machine parts. be able to.

In addition, 8.8' is a seal.

FIG. 7 shows an example in which the above-mentioned module is used to guide the table of a machine tool, in which a track 1' is mounted on the bed 10, and a bearing body 2' is mounted on the lever 11. This is an example in which the roller is fixed and used as a bearing for line motion in place of a roller. code 12
is the preload adjustment screw. By configuring the table of a machine tool in this way, it is easy to obtain a high-precision, low-profile rolling surface with equal load ratings in all four directions, and since the rolling elements are rollers, they are more compact than balls. It is possible to achieve high load capacity and rigidity.

Since the present invention is constructed as described above, it is not only possible to receive equal rated - weight □ in four directions, but also
- Since the intersection point of the normal direction of the center of the curve is located outside of the track base, the resistance against moment load is also large.

□ By forming parallel roller paths that precisely match the longitudinal dimensions of the rollers on both sides of the transfer surface,
Skewing of the rollers can be prevented. □ In addition, it is possible to use the standard ``R'' number of JIS dimensions that have been manufactured for rolling bearings, and there is an effect that □ there is no drop in the ``R''.

Furthermore, when the roller type linear motion bearing of the present invention is used in a modular form, there is an effect that a highly accurate, low-profile rolling surface with equal load ratings in all four directions can be easily obtained.

A*- It goes without saying that the load capacity and rigidity are significantly improved by using rollers as the rolling mulberry.

[Brief explanation of drawings]

Figure 1 is a view of only the right side of the cross section taken at right angles to the axial direction (
However, the guide side plate is a side view), Figure 2 is a sectional view perpendicular to the axial direction of the bearing body and center block, Figure 3 is a sectional view in the direction of Figure 1 I [I-I line, and Figure 4 is a sectional view of the second FIG. 5 is a sectional view similar to FIG. 1 showing an embodiment, FIG. 5 is a sectional view along the line V-V in FIG. 4, and FIG. 6 is an axis line showing an embodiment in which the present invention is applied to a modular linear motion bearing. FIG. 7 is a cross-sectional view showing an embodiment in which a modular bearing is used for guiding a table of a machine tool. 1... Track base 2... Bearing body 3.3'...
・Roller circulation path 6.6'...End cap 5...Guiding side plate agent Patent attorney Yuyosuke - 2 other people Figure 2 JP-A-139912 (4) Figure 4 ■ 1〉 One door Pa&ni″2

Claims (2)

[Claims] (1) Each of the four
This roller type is characterized by having a pair of roller circulation paths that are inclined inward at 5 degrees, and by doubling the end camps provided on the bearing body so that the rollers on the upper and lower transfer surfaces are crossed in the space and circulated. Bearings for linear motion. (2) The roller type linear motion bearing according to claim 1, wherein the bearing main body includes a guide side plate having a curved end surface that comes into contact with a part of a corner of the roller.