Sliding bearing installation

The journal, which is the sliding partner for GLYCODUR^® bearings, must always be broader than the bearing itself to avoid step formations in the gliding area of the bearing. This is particularly important if axial displacement can occur between the shaft and housing due to shaft elongation. The housing bore for the bearings should always receive a chamfer so that the bushing can be pressed more easily into the housing, particularly since slitted bushings often show an open split line. The shaft ends also need a chamfer to avoid damage to the sliding layer when inserting them into the bushings. In both cases the angle of the chamfer should be 10 to 15° (Fig. 1).

If an axial positioning for the GLYCODUR bushings is provided, the diameter of the housing shoulders should be no smaller than + 0.8 mm (0.032 in).

For the dry running GLYCODUR^® F bearings, an exact alignment is especially important. If misalignment cannot be avoided, constructive measures are needed to avoid inadmissibly high edge loads.

Such measures could consist of a larger chamfer on the housing bore or by using a broader bushing which protudes on both sides over the housing. (Fig. 2)

If misalignments have to be compensated for and the operating conditions allow the use of GLYCODUR^® A bushings, then those with a machining allowance (GLYCODUR^® AB) should be used. These bushings can be bored or reamed after installation.

If the shafts are to be located radially as well as axially the loads must be compensated for by using flanged bushings or bushings in combination with thrust washers (Fig. 3). The use of flanged bushings and thrust washers is advantageous even by small axial loads, particularly where no suitable thrust surface is available due to material or machining reasons.

When using flanged bushings, it is important to chamfer the housing bore so that it does not come into contact with the flange of the bushing (Fig 4). Thrust washers are usually radially located in a turned recess in the housing and secured by a dowel pin or grub screw as shown in figure (Fig. 5). The necessary measures for this type of fastening can be found in the tables for the GLYCODUR F and GLYCODUR A style bearings. If a recess cannot be provided in the housing, then the thrust washers can also be secured by using dowel pins, screws or by bonding. To avoid damage, the heads of the pins or screws should be recessed by at least 0,3 mm (0,0118 in) below the gliding bearing surface. The thrust washer should be supported under its entire surface.

Fig. 4 - Chamfer in housing bore when using a GLYCODUR flanged bushing

Fig. 5 - Fixing of GLYCODUR thrust washers