Abstract: A centrifugal oil filter assembly has a disposable rotor mounted on a reusable permanent shaft which is screwed into an adaptor mounting the filter to an engine block. A reusable permanent open top filter casing is connected to the support shaft and sealed at its top by a replaceable gasket to a vented top member carried by the adaptor so that by rotating the filter casing the shaft is unscrewed and the rotor (and gasket) can be replaced.

Abstract: An oil separator cartridge includes a cylindrical spin-on housing having opposite inlet and outlet ends connected by an intermediate wall with the inlet end including a threaded aperture threadably mountable on an engine oil output tube having a smooth cylindrical outer end surface; a centrifugal separator rotor unit is mounted on an axially shiftable shaft in the housing for rotation and axial reciprocation for receiving oil from the oil output tube. A coil spring mounted in the housing urges the axially shiftable shaft and the centrifugal separator rotor unit toward the inlet with a force of sufficient strength to normally overcome the axial force exerted on the rotor unit by oil under normal pressure in the oil output tube; however, the coil spring permits the rotor unit to axially move away from the inlet in response to pressure surges above said normal pressure in the oil output tube to cushion the effect of such pressure surges on the cartridge.

Abstract: The invention relates to a spin-on centrifugal filter or separator for purifying liquid such as oil used in an engine, and to the method of making and assembling the same. The completed separator is in the form of a spin-on cartridge having rotatably mounted therein a jet-actuated, centrifugal separator or rotor. The cartridge, which can conveniently be screw-threaded and thus of the spin-on type, comprises an outer housing or casing within which the rotor is mounted on a perforated hollow shaft depending from a spin-on cover for the cartridge which may be applied to the outer casing or housing after the rotor has been assembled on the hollow shaft. Liquid, e.g., oil, to be treated enters the cartridge from the engine casing, through a screw-threaded opening in the spin-on cover, passes to and through the hollow perforated shaft into the interior of the rotor where the liquid, under pressure, serves to impart centrifugal motion to the rotor, and passes outwardly from the rotor through jet openings therein.