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Junction Design

The journal, which is the sliding partner for GLYCODUR® bearings, must always be wider than the bearing itself to avoid step formations in the sliding 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° (see )

f an axial positioning for the GLYCO­DUR® bushings is provided, the diameter of the housing shoulders should not be smaller than d = +0.8 mm.

For the dry running GLYCODUR® F bearings an exact alignment is especially important. If misalignment cannot be avoided, constructive measures are needed to inhibit inadmissibly high edge loads. Such measures could for example consist of a larger chamfer on the housing bore or by using a broader bushing which protrudes on both sides over the housing (see ).

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 (see ). The use of flanged bushings and thrust washers is advantageous even by small axial loads, particularly were 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 (see ). 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 . The thrust washer should be supported on its entire circumference. The necessary measures for this type of fastening can be found in the tables for thrust washer products for [GLYCODUR® F] and [GLYCODUR® A].

If a recess cannot be provided in the housing then the thrust washers can also be secured by using dowel pins, screws (see .) or by bonding. To avoid damage, the heads of the pins or screws should be recessed by at least 0.3 mm below the sliding bearing surface.

– Junction A

Chamfers in shaft and housing bore

– Junction B

Avoidance of misalignments by using a larger GLYCODUR® bushing

– Junction C

Combination of a GLYCODUR® thrust washer with a cylindrical bushing

– Junction D

Chamfer in housing bore if using a GLYCODUR® flanged bushing

– Junction E

Fixing of GLYCODUR® thrust washers

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GLYCODUR® Sales and Engineering Team

Phone +49 611 201-9130
glycodur(at)tenneco(dot)com