Importance

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Abstract

The invention relates to a filter for cleaning lubricating oil, especially for internal combustion engines of motor vehicles, with a filter case which, when installed, is in an at least approximately upright position. It has a cylinder-shaped oil filter cartridge and an inlet for the dirty oil flowing through the filter cartridge, plus an outlet for clean oil connected to the central interior part of the filter case and situated in a base at the bottom end of the filter case. A drain passage at the bottom end of the filter case becomes connected to the inlet chamber of the filter case whenever the filter cartridge is removed, plus a closure which cuts the drain passage off from the filter case. The filter in accordance with the invention is distinguished by the fact that the closure is a valve body which is axially displaceable in the drain passage and which forms a valve together with at least one constriction in the drain passage, that the valve body is pre-biased in the opening direction by a first, weaker spring, and that the valve body can be biased in the closing direction by a second, stronger spring which, when the filter cartridge is inserted into the filter case, thrusts against its end facing the valve body.

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First Claim