JPH0339619Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a rolling bearing device used as a direct acting linear way bearing or a swivel seat bearing.

<Prior Art> Conventionally, as this type of rolling bearing device, one shown in FIG. 2 is known. This rolling bearing device has a fixed side race 7 fixed to the top surface of a support table, etc., and a moving side race 8 fixed to the bottom surface of a moving table opposite to this, each having a V-shape at right angles in the longitudinal direction. raceway grooves 9, 10 are provided, and cylindrical rollers 11, 11... are arranged adjacently so that the axes C, C... are alternately orthogonal to the raceway grooves 9, 10, forming one row. Cylindrical roller 1
The rolling circumferential surface 12 of 1 is alternately in line contact with the lower groove left surface 9l, the upper groove right surface 10r, the lower groove right surface 9r and the upper groove left surface 10l, so that the movable race 8 is slidably supported on the fixed race 7. There is.

<Problems to be solved by the invention> However, in the above conventional bearing device, the cylindrical roller 1
As shown in FIG. 3, the cylindrical rollers 11, 11, which are orthogonally adjacent, are
There is direct point contact at one point P on the rolling surface. Therefore, at the contact point P of the cylindrical roller, the surface pressure becomes extremely large, causing so-called galling. And once galling occurs, this galling is
Due to the constant reciprocating movement of the movable race 8 that supports the load of the moving table, etc. in the direction of arrow Y,
As the cylindrical rollers 11 and 11' roll in the Y' direction, they expand in the Z and Z' directions, and a rough annular portion is formed at the center of the rolling surface of the cylindrical rollers, causing the raceway groove 9 , 10 Furthermore, there is a drawback that it adversely affects the sliding movement and accuracy of the moving race 8.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing device in which galling does not occur by reducing the contact pressure between adjacent cylindrical rollers.

<Means for Solving the Problems> In order to achieve the above object, the rolling bearing device of the present invention has a V-shaped raceway carved on the opposing surfaces of a pair of opposing races, and an axis line on the raceway. Of a pair of adjacent cylindrical rollers arranged in an X-shape in an alternating manner, one of the cylindrical rollers has a curvature corresponding to the rolling surface of the other adjacent cylindrical roller at the center of the rolling surface. It is characterized by having a recessed part.

<Function> The center of the rolling circumferential surface of one of the adjacent cylindrical rollers fits into the recess provided in the center of the rolling circumferential surface of the other cylindrical roller, and both circumferential rollers are aligned with each other. A series of cylindrical rollers arranged in V-shaped orbits of a pair of races that are in contact and facing each other sequentially come into line contact with each other. This reduces the contact pressure between adjacent cylindrical rollers and prevents galling.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

Figure 1 shows cylinders arranged with their axes alternately intersecting at right angles in the opposing right-angled V-shaped raceway grooves 9 and 10 of the fixed race 7 and moving race 8 of the rolling bearing shown in Figure 2. It is a perspective view showing a pair of adjacent rollers. In FIG. 1, 1 is one of the circumferential rollers having an axis C inclined to the right; 1' is a cylindrical roller 1 having an axis C' perpendicular to the axis C and inclined to the left;
The other cylindrical roller 3 in contact with the cylindrical roller 1' is an annular recess provided in the center of the rolling peripheral surface 2' of the cylindrical roller 1' so as to be perpendicular to the axis C'.

The recess 3 of the cylindrical roller 1' has a radius of curvature (R=D/2) equal to the radius of the cylindrical roller 1, and the central convex portion of the rolling surface 2 of the cylindrical roller 1 is tightly fitted into the recess 3 of the cylindrical roller 1'. The cylindrical rollers 1 and 1' are in line contact with each other as shown by the broken line A in the figure. In addition, cylindrical roller 1
The rolling surface 2 is the left side of the upper groove (see 10l in Figure 2).
and straight line B ₁ , and the right side of the bottom groove (see 9r) and straight line B ₂
On the other hand, the rolling peripheral surface 2' of the cylindrical roller 1' is in line contact with the right surface of the upper groove (see 10r) at a straight line _E1 ,
It makes contact with the left side of the lower groove (see 9l) at each broken line _E2 .

In the rolling bearing device having the above configuration, the pair of adjacent cylindrical rollers 1 and 1' are in line contact with each other along the broken line A as described above, and therefore both raceways of the pair of opposing races (see 7 and 8 in FIG. 2) Groove (same 9,10
A series of cylindrical rollers arranged in (see) sequentially come into line contact with each other. As a result, the mutual contact pressure between adjacent cylindrical rollers is significantly reduced compared to the case of point contact, and galling does not occur.

<Effects of the invention> As is clear from the above explanation, the rolling bearing device of the invention has axes arranged alternately in an X-shape on V-shaped tracks carved on the opposing surfaces of a pair of opposing races. A concave portion having a curvature corresponding to the rolling circumferential surface of the other adjacent cylindrical roller is provided at the center of the rolling circumferential surface of one of the adjacent pairs of cylindrical rollers arranged in a crossed manner. Therefore, since adjacent cylindrical rollers make line contact with each other instead of point contact one after another, the contact surface pressure between the cylindrical rollers is greatly reduced, and galling that occurs on the cylindrical rollers due to mutual contact can be prevented, resulting in a high Bearing accuracy can be maintained over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of an embodiment of the present invention, Fig. 2 is a perspective view of a conventional direct acting linear way bearing,
FIG. 3 is a detailed perspective view of FIG. 2. 1, 1'... Cylindrical roller, 2, 2'... Rolling peripheral surface,
3... Annular recess, 7... Fixed side race, 8...
Moving side race, 9, 10... raceway groove, C, C'...
Axis line.

Claims (1)

[Claims for Utility Model Registration] A rolling bearing device in which V-shaped tracks are provided on the opposing surfaces of a pair of opposing races, and cylindrical rollers are arranged on these tracks with their axes intersecting alternately in an X-shape. A rolling bearing characterized in that a concave portion having a curvature corresponding to the rolling circumferential surface of the other adjacent cylindrical roller is provided in the center of the rolling circumferential surface of one of a pair of adjacent cylindrical rollers. Device.