Abstract
Grease life in hybrid bearings is longer than that in all-steel bearings. This will be shown in this article by means of grease life tests with a large number of greases for both deep groove ball bearings (DGBBs) and cylindrical roller bearings (CRBs). The results show that grease life for hybrid bearings is always larger than that for equivalent all-steel bearings and that this varies between a factor of 2 and 9 depending on the grease type used. For cylindrical roller bearings, grease life does not increase with decreasing speed below a minimum value. However, at these relatively low speeds, hybrid bearings give a longer grease life than all-steel bearings.
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