Abstract: A filter element has a pleated filter mat (3). The terminal axial ends (7, 8) of the mat are connected to end caps (9, 11). The mat has a main structural layer (15) having filtering properties and a first additional structural layer and a second additional structural layer (17,19). The surface area of each of the additional structural layers (17, 19) is smaller than the surface area of the main structural layer (15). The axial ends (12, 14) of one additional structural layer (17) is located at an axial distance from the axial ends (16, 18) of the other additional structural layer (19) on the filter mat (3).

Abstract: A filter element for fluids, in particular for hydraulic fluid, has a foldable filter casing (10) with at least one filter layer (18, 20, 22, 24) extending between two end caps (26, 32). To vary in regions the thickness of the filter casing (10), the height (h1) of each filter fold (12, 44) increases from one end cap (26) to the other end cap (32). Alternatively, with the filter fold height (h1) being maintained, the outer diameter (40) of the filter casing (10) varies in the direction of one of the end caps (26, 32).

Abstract: A filter element for fluids, in particular for hydraulic fluid, has a foldable filter casing (10) with at least one filter layer (18, 20, 22, 24) extending between two end caps (26, 32). To vary in regions the thickness of the filter casing (10), the height (h1) of each filter fold (12, 44) increases from one end cap (26) to the other end cap (32). Alternatively, with the filter fold height (h1) being maintained, the outer diameter (40) of the filter casing (10) varies in the direction of one of the end caps (26, 32).

Abstract: A filter element comprising a pleated filter mat (3), the terminal axial ends (7, 8) of which are connected by an end cap (9, 11) and which includes a main structural layer (15) having filtering properties and at least one first additional structural layer and a second additional structural layer (17, 19), the surface area of each of said additional structural layer (17, 19) being smaller than the surface area of the main structural layer (15), is characterized in that the axial ends (12, 14) of one additional structural layer (17) is located at n an axial distance from the axial ends (16, 18) of the other additional structural layer (19) on the filter mat (3).

Abstract: The invention concerns a filter element for fluids, in particular for hydraulic fluid, consisting of at least one foldable filter casing (10) with at least one filter layer (18, 20, 22, 24), which extends between two end caps (26, 32), characterized in that, in order to vary in regions the thickness of the filter casing (10), the height (h1) of each filter fold (12, 44) increases from one end cap (26) to the other end cap (32) or, with the filter fold height (h1) being maintained, the outer diameter (40) of the filter casing (10) varies in the direction of one of the end caps (26, 32).

Abstract: The invention relates to a filter device comprising at least one filter element, said filter element having an inner fluid space (4), and comprising a permanent magnet device with at least one rod-like body (13) that can be brought into a functional position, in which it is located at least in part inside the fluid space (4), and can be moved out of the functional position, the device being characterized in that a stripping device is provided, with at least one stripping element (29, 31) which, while the respective body (13) is being moved out of the functional position, comes into contact with the exterior thereof in order to strip off accumulated foreign matter.