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DESIGN OF BEARING ARRANGEMENTS

Housing

Bushes The housing bore should have a chamfer fGx20°±5°,This chamfer makes it easier to press the bushes into the housing.

During running-in, some of the surface of the PTFE/Pb or solid lubricants is transferred to the mating surface. A running surface is formed which has low coefficient of friction and this has a positive effect on the operating behaviours. For 3-layer dry bearings, after running-in, some of the porous bronze layer can be seen on the sliding layer as individual areas of different size. This shows that the bearing is functioning correctly.

Housing bore diameter d_G	Chamfer with f_G
d_G≤30	0.8±0.3
30<d_G≤80	0.8±0.3
80<d_G≤180	1.8±0.8
180<d_G	2.5±1.0

Flange Bushes

The radius at the transition from the radial to the axial component must be taken into consideration for flange bushes. A sufficiently large chamfer must be provided on the housing to prevent the flanged bushes fouling in the area of the radius. Sufficient support must be provided for the flange in applications with axial loading.

Housing bore diameter d_G	Chamfer with f_G
d_G≤10	1.2±0.2
10<d_G	1.7±0.2

Shaft

To make fitting easier , the shaft ends should be chamfered. All sharp edges which could damage the sliding layer must be broken. Higher surface qualities will extend the service life only slightly whereas greater roughness depths will reduce the service life considerably. Ground or drawn surfaces are preferred. The surface finish of the mating material should be between Ra 0.2- Ra0.8 um obtained by grinding normally.

incorrect

correct

Seals

If increased levels of contamination occur or the bearing is used in an aggressive environment, the bearing position should be protected. The usual solution is to design the surrounding structure so that the contamination cannot reach the bearing position. A collar of grease may also be used or shaft seals if the level of contamination is particularly high.

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