Patent ID: 8485365

Claim:
An internal combustion engine liquid filter, comprising: a filter housing cover adjacent a housing space, within a housing and a ring filter element; at least one intermediate piece arranged below the filter housing cover and above the housing when the filter housing cover is attached to the housing; an inlet channel arranged on a housing side, wherein the inlet channel communicates with a crude side of the ring filter element, and an outlet channel arranged on the housing side, wherein the outlet channel communicates with a pure side of the ring filter element; a drainage channel on the housing side, wherein the housing space drains through the drainage channel when removing the filter housing cover; and a closure mechanism arranged in the intermediate piece and the closure mechanism is rotatable about a filter axis, wherein the closure mechanism has a closure element for closing, wherein the closure mechanism is configured such that when the filter housing cover is attached to the housing, it is fixed in a precisely defined rotational angle position in which the closure element is arranged in alignment with the drainage channel and, by attaching the filter housing cover, it is moved into a position to close the drainage channel, while removing filter housing cover causes the closure mechanism to rotate while it is simultaneously moved axially away from the housing such that the closure element releases the drainage channel and wherein the closure mechanism is configured as a spring plate, which includes a ramp like mandrel, which projects axially in the direction of the housing, and includes a plurality of flexible cantilever arms, which project in the direction of the ring filter element.