Patent ID: 6706181
Filing Date: 2004-03-16
Classification: B01D,F01M

Abstract:
A liquid filter, especially an oil filter, for cleaning lubricating oil, especially for internal combustion engines in motor vehicles,having a ring-shaped filter insert (9), and a filter housing (2) which is arranged essentially upright in the installed state and includes a receiving area (3) for receiving the ring-shaped filter insert (9) inserted into it for filtering a liquid, having an inlet (19) for unclean liquid, having an outlet (20) for cleaned liquid, having an additional discharge channel (24) which is released by removal of the ring-shaped filter insert (9) and leads out of the receiving area (3) on a bottom (18) of the receiving area (3), whereby a pin (25) that projects eccentrically and runs parallel to the longitudinal axis (14) of the ring-shaped filter insert (9), and is integrally molded on a lower end disk (21) of the ring-shaped filter insert (9) and penetrates into an opening (26) in the discharge channel (24) and seals it when the ring-shaped filter insert (9) is inserted into the filter housing (2), characterized in that a ramp (28) is formed on the bottom (18) of the receiving area (3), beginning with a lower end at the opening (26) in the discharge channel (24) in the bottom (18) and rising into the interior space of the receiving area (3) with an increase in the ramp length, the ring-shaped filter insert (9) is adapted to the filter housing (2) so that the ring-shaped filter insert (9) can rotate freely about its longitudinal axis (14) in the receiving area (3) as long as the pin (25) does not engage in the opening (26) in the discharge channel (24), the ramp (28) and the pin (25) are coordinated with regard to positioning and interacting contact zones (29, 30) so that when the ring-shaped filter insert (9) is inserted into the filter housing (2), the pin (25) rests with its contact zone (29) on the contact zone (30) of the ramp (28)â€”as long as the pin has not yet penetrated into the opening (26) in the discharge channel (24)â€”and it slides downward with the rotation of the ring-shaped filter insert (9), penetrating into the opening (26) in the discharge channel (24) at the lower end of the ramp (28).