Technical

Sized bearings

1.Inside diameter of the bushing

Generally,the inside diameter of the bushing depends on the diameter of its mating axis.

2.Length of the bushing

The length of the bushing depends on the size of the pressure-shouldering surface.The longer the bushing,the less pressure at the surface,for the onger bushing, the load on the bushing is relatively lessened. But simultaneously, it may result in deviation contact or lower cooling efficiency and thus shorten the service life of the bushing. On the contrary, if the length of the bushing is too short,lubricating grease may quickly flow out of the bushing.Therefore,it hardly forms a grease film and capability of the bushing is accordingly debased./p>

A comparison of L/d's effect on the bushings,especially oil lubricating bushings

Short bushing(d>L) Comparison items Long bushing(d<L)
Small

Force on the oil film

Great

Strong

Cooling ability

Weak

Can not be too high

Surface pressure

Can be high

High

Safety aqainst beating deviation

Low

Weak

Bushing rigidity

String

Weak

Shock absorbing ability

Strong

Small

Space

Large

3.Bushing thickness

The main advantage of standard composite self-lubricating bushings rest with their thin wall thickness.Standard thickness can be 0.5mm2,0.75mm2;,1.0mm2,1.5mm2,2.0mm2,2.5mm2.

In thickness design of the non-standard gliding bushing,the designer could consult thefollowing proportion of SB and D.

A)For thin wall thickness gliding metallic bushing,proportion between SB and D equals to 0.03~0.06.

B)For thin wall thickness gliding metallic bushing, proportion between SB and D equals to 0.08~0.12

C)For plastic gliding bushing,proportion between SB and D equals to 0.1~0.12

4.Bushing Chamfer

In order to make fixing easier and avoid deviation load,the bushing must be inner and outer chamfered in the direction of its length.Dimension of the chamfer are showing in the following form.

Wall thickness Out Chamfer Dimension Inner Chamfer Dimension
≤0.5

Burr polished

Burr polished

0.75

0.5±0.3×20°

0.3±0.2×45°

1.0

0.6±0.3×20°

0.3±0.2×45°

1.5

0.6±0.3×20°

0.4±0.2×45°

2.0

1.2±0.3×20°

0.6±0.2×45°

Weak

Shock absorbing ability

Strong

2.5

1.8±0.3×20°

0.6±0.2×45°