CZ302000B6 - Cage for two-row spherical-roller bearings - Google Patents

Abstract

The present invention relates to a cage for two-row spherical-roller bearings comprising an outer face (6), an inner face (7) and transverse ribs (8) connecting mutually these faces (6, 7) defining windows for placing spherical rollers (3). Inside of at least one of the faces (6, 7) there is formed radially a row of guide projections (1) extending axially inwardly the cage (4) and bearing radially at spots of the transverse ribs (8) from inside on the periphery of the spherical rollers (3). Projection (2) reaching in the cage (4) windows can be performed on outer sides of the transverse ribs (8).

Description

Cage for double row spherical roller bearings

Technical field

The invention relates to a cage for double row spherical roller bearings, which consists of an outer face, an inner face and transverse ribs connecting these faces to each other by means of which the spherical bearing windows are defined.

BACKGROUND OF THE INVENTION

In known designs of the aforementioned kind, guiding solutions on the inner ring or in combination with an auxiliary floating ring located in the middle of the width of the raceway surface of the inner ring are used to guide the cage in the bearing. Such solutions have a number of disadvantages. One of them is that, in the design of the bearing cage without the auxiliary guide ring, it is intended only for lower rotational frequencies and also for perfectly perfect lubrication of the sliding contact of the inner guide diameter of the cage with the inner ring collar.

A further disadvantage is that there is an enormous wear of both the cage guide diameter and the inner ring surface itself, where the wear particles enter the inner space of the bearing itself and cause it to prematurely be decommissioned, often resulting in an accident. Another disadvantage is the technologically and financially demanding production of protrusions in the pockets - cage pockets, which are to serve as a safety element against falling out of casks from its own cage both during its assembly and during handling at the customer before assembly. A further disadvantage is that when the inner diameter of the cage in the guide portion wears, the locking lugs in the cage pockets slide against the surface of the barrels with subsequent intensive wear of the cage part, contributing to the final premature bearing failure in the bearing. This enormous wear of the cages and the guide diameter leads relatively rapidly to a considerable overall wear of the bearing, thereby reducing its service life and reliability and the necessity of making expensive replacements. The floating sub-ring solution allows the maximum rotational speeds to be increased for improved cage guidance, but is more expensive to manufacture and economically.

SUMMARY OF THE INVENTION

It is an object of the present invention to overcome these drawbacks, both by the design of the cage and by the possibility of applying the heat treatment of the cage surface as a final operation.

This object is achieved by a cage for double row spherical roller bearings consisting of an outer face, an inner face and transverse ribs connecting the faces to each other, defining spherical bearing windows according to the invention, which is characterized in that at least one of the faces is a plurality of radially inwardly extending axially inwardly facing cages of projecting guide lugs which, at transverse ribs, abut radially inwardly on the circumference of the spheres.

Advantageously, protrusions are provided on the outer sides of the transverse ribs which extend into the windows of the cage.

It is therefore an object of the invention that the cage guiding is performed on the barrels by means of millet-extending guiding protrusions extending from the cage front from the outside or at the same time on both sides for a further embodiment with combined cage guiding on the outside and inside barrels. sides in the outer ring orbit.

Another feature, advantageous in both manufacturing and functional terms, is that the cage pockets in the cage pockets are replaced by protrusions made in two places by the rolling or crimping method. These protrusions are used only for mounting and securing the position of the barrel in the cage against falling out.

Another feature which is advantageous from a functional point of view is that the cage has a surface treatment which increases the hardness and wear resistance.

Another feature, advantageous in both production and function, is that there is no need to use an auxiliary guide ring to guide the cage in the middle of the bearing.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be illustrated in greater detail with reference to the accompanying drawings, in which: FIG. The invention has two rows of guide lugs extending from both ends of the cage.

DETAILED DESCRIPTION OF THE INVENTION

Giant. 1 shows a cage 4 with barrels 3 in an embodiment with one row of guide lugs I from the outside 5, extending from the outer face 6 of the cage 4, and with pairs of rolled lugs 2 on the cage surface 4. The cage 4 itself can be made for example plastic.

The rolling bodies, which are formed by the barrels 3, are mounted in the windows of the cage 4, which are defined by an outer face 6 and an inner face 7 and transverse ribs 8 connecting these faces 6, 7 to each other.

The guiding of the cage 4 is ensured by the aforementioned guide lugs 1, which extend from the outer side 5 of the outer face 6 of the cage 4 at the transverse ribs 8 axially inwardly of the cage 4 and permanently secure the cage 4 from its radially inner side.

For practical reasons, in particular for handling the mounted cage 4 when mounting the bearing, it is necessary to secure the cages 3 in the cage 4 also from the radially outer side of the cage 4, provided by pairs 2 formed by pairs by rolling on the outer sides of the transverse ribs 8 slightly into the cage windows 4.

This solution allows a positive absorption of the axial and radial forces caused by the rotation of the spherical roller 3 formed by the rolling bodies, the cage 4 itself and the inner ring of the double row spherical roller bearing (not shown). The solution eliminates wear of the inner ring surface, excessive bearing wear and increases the cut-off speed for lubrication with both oil and grease. This solution can be applied for all type dimensions of double row spherical roller bearings with sheet metal or polyamide cages, eventually also for thrust spherical roller bearings.

Giant. 2, in which the same reference numerals are used for identical or corresponding elements and components, shows a cage 4 which, in contrast to FIG. 1, has a corresponding row of guide lugs 1 on the inner face 7 of the cage 4, thereby further improving cage guiding 4 barrels 3.

Claims (2)

5 1. Cage for double row spherical roller bearings, consisting of an outer face (6), an inner face (7) and transverse ribs (8) connecting these faces (6, 7) to each other, defining the spherical bearing windows (3) characterized in that at least one of the fronts (6, 7) is radially inwardly formed by a series of axially inwardly directed cages (1) extending radially inwardly on the circumferences of the barrels (8) at the transverse ribs (8). 3). io Double row spherical roller cage according to claim 1, characterized in that protrusions (2) are formed on the outer sides of the transverse ribs (8) which extend into the cage windows.