DE9017861U1 - Double row angular contact bearing - Google Patents

Description

FAG Kugelfischer Georg Schäfer R-R-S/2-143WL-wa-st

Limited partnership with shares 1 April 1992

Double row angular contact bearing

The invention relates to a double-row angular contact bearing according to the preamble of claim 1.

A rolling bearing of the type described can be seen, for example, in DE-Gm 17 69 651. Here, a specific axial and radial preload of a double-row spherical roller bearing is achieved by arranging fitting segments between the raceway parts. With the help of these fitting parts, it is possible to achieve a specific preload or bearing clearance using relatively simple means, despite the differing tolerances of the individual bearing parts in the form of the rollers, inner and outer rings. On the one hand, rolling bearings are highly accurate precision parts, but on the other hand, individual parts with differing tolerances arise during production. In order to avoid reworking or destroying certain individual parts, which is expensive and time-consuming, fitting rings have been used for many years, with the help of which tolerance deviations can be easily compensated. All that is required is a certain number of fitting rings with different tolerances, which are installed depending on the determination of the tolerance deviation of the bearing. This means that bearings that are axially and radially precisely adjusted can be provided by the rolling bearing manufacturer and delivered to any customer using simple means. However, if these bearings are then installed in machines, where the surrounding parts also have tolerance deviations, for example in the case of rotating

The inner ring is always fitted onto the shaft with a press fit. This press fit then causes an elastic deformation of the inner ring parts up to the raceways. This then eliminates the originally ideally set play.

It is therefore the object of the invention to provide a spacer ring with the help of which this disadvantage does not occur and which enables the rolling bearing installer to adapt to the tolerance deviations of the surrounding parts using simple means.

The solution to the problem is described in the characterizing part of the claim. It is important that the fitting ring does not consist of one part, but of two parts as a spacer ring, which are arranged next to each other between the split races. It is also important that one part of the spacer ring is dimensioned in such a way that it takes into account the tolerance deviations during the manufacture of the rolling bearing parts and, for example, creates a so-called zero case. This so-called zero case can then already take into account the desired axial play or the desired projection in the bearing. If such a bearing is now delivered to the customer, the customer can measure the tolerance deviation of his shaft or housing and select the appropriate spacer ring, which can also be designed as a shaft or housing collar. After this is installed, the desired bearing setting is then achieved. From theoretical considerations, tables can be prepared in advance with the help of which the selection of different spacer rings can be carried out without further ado, whereby the tolerance deviation of the shaft and, for example, the desired preload are taken into account if the latter is only carried out by the bearing installer.

This then results in a bearing that is set up for operational reliability using simple means, whereby no more errors can be made during assembly, because undue tension is not possible due to the rigid spacer rings.

The invention is explained in more detail with reference to two figures.

Figure 1 shows the partial longitudinal section of a double row tapered roller bearing in O arrangement.

Figure 2 shows the partial longitudinal section of a double row tapered roller bearing in X-arrangement.

The bearing according to Figure 1 consists of a one-piece outer ring 1, two rows of tapered rollers 2, each with a cage 3, and the two inner rings 4. Between the two inner rings 4 there is a so-called spacer ring, which is used to adjust the bearing preload or the bearing clearance. According to the invention, this ring 5 consists of two ring parts 5' and 5", which lie axially against one another and thus result in a rigid axial fixation of the inner ring parts 4 to one another.

When the bearing is assembled at the rolling bearing manufacturer, the tolerance deviations of the individual bearing parts result in a changing position of the front face 4' of the inner rings 4 relative to one another. The ring 5' is then inserted into the gap, which takes into account and eliminates the deviations from bearing to bearing. This means that the so-called zero case is always created at a certain installation location, the size of which must of course be agreed upon with the bearing installer.

-A-

The bearings, which are standardized in this way, are passed on to the installer. The installer then measures the tolerance of his shaft and can select the second matching 5" ring based on previously calculated values contained in tables. Before the other inner ring 4 is inserted, this 5" ring is then inserted into the bearing and the latter is pressed onto the shaft. This then results in the desired uniform preload in the bearing, which is kept within narrow limits, even though shafts with different tolerances were used.

Figure 2 shows corresponding conditions for another type of bearing. Here, the ring parts 6' and 6", which are connected in one piece to the housing 9, are arranged between the outer rings 7 and one ring 6' also has a lubricant hole 8.

There are bearings in which the races are installed with a press fit on both the shaft and the housing. The invention can also be used in these cases with the same benefit. Here, it is only necessary to take into account the elastic deformation of the inner and outer rings when selecting the second fitting ring part 5" or 6".

Claims (1)

FAG Kugelfischer Georg Schäfer R-R-S/2-143WL-wa-st Limited partnership with shares 1 April 1992 Claim Double-row angular contact bearing, in particular tapered roller bearing, in which at least one race consists of two ring parts, with a rigid spacer ring being provided between the ring parts, characterized in that the spacer ring (5; 6) consists of two parts (5', 5";6',6") arranged next to one another, with one part (5'; 6 ^' ) being determined in its width such that it takes into account the tolerances in the manufacture of the rolling bearing parts, while the other part (5";6") is adapted to the tolerance deviation of the shaft and/or the housing.