CS232486B1 - Roller bearing for rotary and axial movement - Google Patents

Abstract

The bearing is formed by a combination of a single or multi-row needle bearing with a ball bushing. On the outer ring of the needle bearing is placed a cage with balls between which is inserted at least one row of second balls arranged parallel to the axis of the bearing and having a diameter larger than the diameter of the balls in the cage. These second balls are placed in arcuate grooves formed in the second outer ring or in the outer ring of the needle bearing, or in both outer rings. The use of the bearing is particularly advantageous for accommodating sliding rotary heads of automatic machine tools, industrial sewing machines, etc.

Description

(54) Roller bearing for rotary rotation and axial movement

The bearing consists of a combination of a single row or multi-row needle roller bearing. On the outer ring of the needle bearing there is a cage with balls between which at least one row of second balls arranged parallel to the bearing axis and having a diameter larger than the diameter of the balls in the cage is inserted. These second balls are housed in arcuate grooves formed in the second outer ring or in the outer ring of the needle bearing, or in both outer rings. The use of the bearing is particularly advantageous for receiving sliding rotating heads of machine tools, industrial sewing machines, etc.

1

232466

The invention relates to a rolling bearing design for rotational and axial movement.

The roller bearings used for rotary and axial movement are designed as a combination of single- or multi-row deep groove ball bearings with outer ball circulation.

However, such a solution is only usable when the bearing has sufficient space in the radial direction. Furthermore, this embodiment is very expensive. For slow-running, easy-to-use bearings, ball cages can be used for both rotational and linear feed.

The disadvantages of the prior art solutions are largely eliminated by the design of the rolling bearing according to the invention. The bearing is a combination of single or multi-row needle roller bearings? ».

SUMMARY OF THE INVENTION The outer ring of the needle bearing has a cage with balls between which at least one row of second balls arranged parallel to the bearing axis and having a diameter greater than the diameter of the balls is arranged.

A plurality of second balls are disposed in a longitudinal groove of an arcuate shape formed in the second outer ring or the outer ring of the needle bearing and optionally in the second outer ring and the outer ring of the needle bearing simultaneously.

The design of the combination bearing according to the invention, in its relatively inexpensive design, takes up a considerably smaller radial space than in the hitherto used and its use is particularly advantageous for accommodating sliding rotary heads of machine tools, industrial suction machines, etc.

The rolling bearing according to the invention is shown in the drawing, in which Fig. 1 is a cross-sectional view of the overall arrangement, Fig. 2 is a cross-section of the bearing perpendicular to the longitudinal axis.

A ball cage 6 is mounted on the outer ring 1, in this case a multi-row needle roller bearing with an inner ring 2. The needles 4 are separated from each other by floating rings 6. For higher speeds, the needles 4 are housed in the needle cage 11.

The ball cage 4, together with the second outer ring 6, forms a marsh ball housing for these balls. In order to prevent rotation of the ball cage 4, three rows of second balls 4 of larger diameter than the diameter of the balls 6 in the cage 4 are inserted between the rows of balls 4 in the described embodiment.

These second balls 6 are arranged parallel to the bearing axis 6 in longitudinal grooves 6 of arcuate shape formed in the second outer ring 6. With smaller bearing diameters, this number of rows of second groove balls e can be reduced to two or even one.

The grooves 6 may also be formed on the outer ring 1 of the needle bearing, or on both rings 4, 6. In the second outer ring 6 for the balls 6, there are boundary rings 10 at the edges.

During rotation of the inner ring 6 of the needle bearing, the needles roll on the outer ring 4, which does not rotate during this rotation. In the axial movement, the second outer ring 6 is moved by means of balls 8 with respect to the outer ring 6 of the needle bearing, with the cage 8ae moving by half the path of the second outer ring 8.

When the second outer ring 6 is rotated, the cage 6 also rotates at the same speed and the inner ring 6 of the needle bearing is rolled by the needles 5 on the inner ring 6, or if the needle bearing is not provided with the inner ring 6 directly on the shaft;

When the inner ring 6 is displaced axially, the entire needle bearing with the outer ring 8 is displaced axially.

BACKGROUND OF THE INVENTION

Claims (4)

Rolling bearing for rotary and axial movement, consisting of a combination of a single or multi-row needle roller bearing, characterized in that the needle bearing has a cage (3) with balls (4) between which an at least one row of second balls (8) arranged parallel to the bearing axis (O) and having a diameter greater than the diameter of the balls (4). Rolling bearing according to claim 1, characterized in that the row of second balls (8) is mounted in a longitudinal groove (9) of an arcuate shape formed in the second outer ring (7). Rolling bearing according to claim 1, characterized in that the row of second balls (8) is mounted in a longitudinal groove (9) formed in the outer ring (1) of the needle bearing. Rolling bearing according to claim 1, characterized in that a series of second balls (8) are mounted in longitudinal grooves (9) formed in the second outer ring (7) and in the outer ring (1) at the same time. 1 drawing