LNF for Naval Water Lubricated Propeller Shaft Bearings
ACM Bearings Ltd in conjunction with naval design and mechanical engineering, have devised and completed an agreed comprehensive test programme on our LNF material. The results of the tests proved conclusively that LNF has superior bearing characteristics when compared to similar nylon and elastomeric type materials currently in use.
LNF is now specified and has been supplied for both new build and spares into many navies worldwide for water lubricated bracket and stern tube bearings in surface vessels and submarines.
ACM LNF material is a highly engineered composite material comprising of a non-woven fabric in an especially formulated anti-scuffing thermosetting resin which contains solid lubricants allowing the material to operate under dry, grease, oil and water lubricated conditions
LNF can be supplied fully machined for new build or spares, replacing rubber and cotton stave bearings also elastomeric or nylon type shell bearings.
One of the major advantages of LNF is that it can be supplied in tube form up to 1600 mm diameter x 1200 mm long. This allows for the design of a complete bearing length system as opposed to two half length bearings (currently supplied) resulting in improved performance, ease of assembly, reduced initial costs (only one retention key required) and reduced bearing replacement maintenance costs
Benefits of LNF Material
| Property | Value |
|---|---|
| Compressive strength (flatwise) | 180 N/mm2 |
| Maximum Working Compressive Strength | 50 N/mm2 |
| Compressive Modulus | 4000 N/mm2 |
| Impact Strength (flatwise) | 35 kJ/m2 |
| Density | 1.3 - 1.4 g/cc |
| Hardness (Rockwell M) | 90 |
| Coefficient of Friction (dry) | 0.13 - 0.18 |
| Maximum Operating Temperature | > 100 °C |
| Thermal Expansion Coefficient | 5.0 x 10-5 /°C |
| Swell in Water (ambient) | 1.0% |
(Material characteristics are nominal and are not guaranteed minima)
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