Patent ID: 8419937

Claim:
A filter device comprising: a cup-shaped filter housing having a longitudinal axis and a housing bottom terminating part bordering an end side of said filter housing, said terminating part having a fluid passage concentric to said longitudinal axis; a filter element received in said filter housing and said terminating part having an end cap with a connecting piece received in said terminating part and with a flat lower end surface extending in a radial plane relative to said longitudinal axis; a retaining device detachably coupling said filter element and said filter housing along said longitudinal axis, said retaining device having inner screw elements in said fluid passage and external screw elements on said connecting piece of said end cap interacting with one another; a sealing device forming a seal between said filter element and said terminating part, said sealing device including a sealing gasket combined with said end cap to form a cohesive component and received in a seat at a transition between said flat lower end surface of said end cap and a first thread turn of said external screw elements; and an annular edge of said terminating part projecting into an interior of said filter housing and having a contact surface adjoining said end cap by a retaining force of said screw elements; and radial ribs on said terminating part bordering said flat lower end surface of said end cap and having axial heights decreasing toward a peripheral zone of said terminating part.