GLACIER BEARINGS

 

 

DX Pre‑Lubricated Bearings

 

 

 

           

In the "DX" range of bearings bushes and thrust washers, Glacier have developed a generally similar construction method to the DU type. The steel backing provides a rigid support for the layers of porous bronze and the Acetal Resin Polymer which is also called by the well known trade name Delrin.

            

You will recall that we refer to Glacier "DU" as a dry bearing as they are most often fitted and used without any lubrication and sometimes in contact with a liquid which can act as lubrication and control temperature rise.  The Glacier "DX" is a pre‑lubricated type.  This does not mean that it is supplied already lubricated but rather that the lubricating grease is applied prior to fitting on the shaft.

            

In operation, the initial pre‑ lubrication grease is transferred around the indentations by the sliding action of the rotating shaft and lasts for a very considerable time without a re‑lube. Thus the indentations act as a reservoir.

            

The code number of Glacier "DX" bushes in inch sizes use 1/16" units of size for the shaft size and length.  A Full listing is given in Appendix 4.

             

Metric DX bushes are available in two types - a pre-finished type and a machineable type. Bearing service stocks are mainly of the pre-finished type and these are identified by the prefix PM (pre-machined). The machineable type (MB) have a thicker coating on the ID allowing reaming to very close tolerances. Note that the imperial dimensioned Glacier are only available in machineable type.


 

Examples in Imperial sizes:

 

  12 DX 08       3/4" shaft x 1/2" long.

  20 DX 16       1‑1/4" shaft x 1" long.

 

Examples in metric sizes:

 

  Machineable type

  MB 1525 DX     15mm shaft x 25mm long.

  MB 2530 DX     25mm shaft x 30mm long.

 

  Pre-machined type

  PM 1420 DX    14mm shaft x 20mm long

  PM 2415 DX    24mm shaft x 15mm long

 

Finished Size:

 

Some idea of the differences in dimensions of Glacier bushes can be seen from the following table:

 

 

MB

(mm)

PM

(mm)

DU

(mm)

Nominal Bore

14

14

14

Journal Diameter

13.950

13.923

14.000

13.973

13.984

13.966

Machined Bore

14.000

14.018

14.040

14.110

 

Housing Diameter

16.000

16.018

16.000

16.018

16.000

16.018

 

Thrust Washers

 

Glacier make a range of both inch and metric "DX" Thrust Washers and the part numbers follow the "DU" system.

 

Examples:

 

  DX 16 suits a 1" shaft (with 1/16" units of diameter.)

  WC 25 suits 25mm shaft.

 

Bronze Backing in "DU" AND "DX"

 

When the quantity to be made at the factory is sufficient to be an economical run.  In place of the steel backing on both "DU" and "DX" glacier material, rolled Bronze can be used.  The change in the material part descriptions to be added "B" for bronze to the code thus: DU (B) and DX (B).

 

When corrosion resistance is required and where rolled bronze would be more suitable than the steel backings, this is the material specified.

 

Glacier "DU" and "DX" Strip

 

We stock and sell Glacier "DU" and "DX" inch pieces 18" long by 4" wide and it is exactly the same material as used in the bearings (see appendix 3)

 

Engineers and Machine makers or repairers cut up the strips to make the facing surfaces to accept sliding motion for the guide ways of reciprocating equipment.  Due to its ability to run dry, good low friction properties and availability from stock there is s general demand for "DU" strip.  "DX" strip is less popular although we do carry a few sizes in stock. The thickness of the 18" x 4" strips of the material is associated with a range of group numbers thus:

 

Group Number Type Thickness
0 DU 0.028in   0.07mm
1 DU 0.044in   1.10mm
2 DU 0.059in   1.49mm
3 DU 0.075in   1.88mm
4 DU 0.091in   2.28mm
5 DU 0.120in   3.03mm
B DX 0.0480in 1.03mm
C DX 0.0630in 1.52mm
D DX 0.0783in 2.02mm
E DX 0.0937in 2.53mm

  

Structural Bearings by Glacier

            

Glacier make an extensive range of standard and special bearings to accept the movement in Bridges due to expansion and contraction from changes in temperature.  They use either "DU(B)" material or a Fibre Glass filled PTFE (Teflon) pad as these will permit the movement under loading from 50 to 3000 tons per bearing. 

 

The sliding face on the Glacier surface is usually polished stainless steel.  The top and bottom base plates are made from high tensile S.G. cast iron or steel and some of the different series will accept a tilting motion, rotating movement and other actions due to the various loadings placed on the bridge girders and beams, etc.

 

Page 4

 

 

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