Patent ID: 7959547

Claim:
A centrifuge for the cleaning of a liquid, in particular a lubricant oil of an internal combustion engine, said centrifuge comprising: a housing; at least one bearing element on the housing side and a rotor which is rotatably mounted thereon; the rotor being comprised of at least two parts, an inner part for accommodating the bearing and a part for retaining impurities in an impurity collection zone; said part for retaining impurities being detachable from the inner part for maintenance of the centrifuge; each bearing element on the housing side being an element comprised of a first bearing material and comprising one or more first smooth bearing surfaces; the inner part, formed as a single piece, being made of a second bearing material and provided with one or more second smooth bearing surfaces; the first and second smooth bearing surfaces cooperating directly with each other, without an intermediate layer of smooth bearing sleeves or anti-friction bearings or other separate bearing components; and the first and second bearing materials together forming a bearing-fit pair of smooth bearing materials.