KS P232: New Material for Extra Efficiency

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September 15, 2015

KS Kolbenschmidt

KS P232: New material for extra efficiency

At this year's Frankfurt Motor Show IAA, Kolbenschmidt is presenting its new KS P232 Permaglide plain bearing material. This manufacturer is thus broadening its portfolio of bearings marketed under the Permaglide brand by adding a very low-friction, robust material for lubricated applications. On hydrodynamic bearing positions such as common rail injection pumps, its start-up properties are so favorable that pump losses can be reduced through the tighter bearing clearances. KS P232 also does an excellent job on chassis and drive train bearing positions exposed to high dynamic loads such as axle joints and kingpins.

Efforts to reduce consumption and emissions on today's engines along with the introduction of new engine running strategies such as start-stop or coasting inevitably entail a high frequency of vehicle start-ups and, in turn, more often than in the past, mixed friction that is especially punishing for plain bearings.

Based on a high performance polyamide, the new KS P232 is suitable for continuous temperatures of up to 180 degrees C. It features the typical 3-layer structure of Permaglide products and, thanks to its tailored polymer composition, it will resist dynamic loads of over 100 MPa. The excellent tribological properties are also the outcome of the special blend of fillers.

Hydrodynamic response even at very low RPMs, mixed-friction losses reduced With its low viscosity and poor lubricity, diesel in particular is a highly critical medium. Diesel-engine tests with KS P232 have, however, shown that the hydrodynamic formation of the required lubricating film takes place even at very low engine speeds. Compared with the high-duty KS P212, which has the highest wear resistance among pump bearing materials presently available in the market, KS P232 features specifically enhanced robustness in terms of edge wear (adaptability) and seizure resistance and therefore excellent start-up properties even when lubricant volumes are low.

Higher efficiency for common-rail injection pumps With KS P232, less diesel is needed for bearing lubrication purposes. Also, extra loads at the edges possibly caused by the drive belt are less critical. This has the advantage that bearing clearances can be reduced. As a consequence much less diesel flows back to the tank and the efficiency of the common rail pump is enhanced. Especially so when considering that parasitic fuel loss in bearings can add up to 15 liters an hour!

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