Filter element with retaining surfaces, filter with a filter element and filter housing of a filter

1. A filter element for installation in an air filter housing, comprising:

an open filter bellows of a filter medium, the filter bellows having

an oncoming flow side where fluid to be filtered enters the filter element; and

an outgoing flow side where fluid to be filtered exits the filter element and defining an element axis extending through the filter element from the oncoming flow side to the outgoing flow side,

wherein, as used herein, axial is a direction parallel to the element axis and radial is a direction traverse to the element axis;

wherein the filter medium is pleated in to a plurality of parallel filter medium pleats;

wherein each pleat of the plurality of parallel filter medium pleats extends in the direction of the element axis from a first pleat edge arranged at the oncoming flow side to an opposing second pleat edge arranged at the outgoing flow side;

a first end disk disposed on a peripheral side of the filter bellows, connected to and covering end edges of the plurality of parallel filter medium pleats of the filter bellows, the first end disk extending from the first pleat edge at the oncoming flow side to the opposing second pleat edge at the outgoing flow side;

wherein the filter element comprises:

a longitudinal retaining configuration arranged on the first end disk and having at least one longitudinal retaining surface which is directed with at least one direction component axially to the element axis of the filter element;

wherein the at least one longitudinal retaining surface is adapted to contact a corresponding longitudinal mating surface of the filter housing, securing the filter element axially to the element axis; and

a traverse retaining configuration arranged on the first end disk spaced apart axially from the longitudinal retaining configuration and having at least one transverse retaining surface which is directed with at least one direction component across the element axis;

wherein the at least one transverse retaining surface is adapted to contact a corresponding transverse mating surface of the filter housing, securing the filter element across the element axis;

wherein the traverse retaining configuration is at least one elastically resilient retaining clamp formed on an outer side of the first end disk and extending radially outwardly therefrom;

wherein each retaining clamp includes two spaced apart curved retaining webs, each extending axially and radially on the first end disk.

2. The filter element according to claim 1 , wherein

the at least one transverse retaining surface is disposed axially and spaced apart at a distance with respect to the element axis from the at least one longitudinal retaining surface with respect to the element axis.

3. The filter element according to claim 1 , wherein

at least one part of the at least one transverse retaining surface is variable elastically in position relative to the filter bellows.

4. The filter element according to claim 1 , wherein

at least one of the transverse retaining surfaces is connected to the first end disk as a unitary in one piece component.

5. The filter element according to claim 1 , wherein

the filter element includes a filter element retaining device, which is connected directly or indirectly to the filter bellows, the retaining device extending between the oncoming flow side and the outgoing flow side along at least one part of the periphery of the filter bellows and which has the at least one retaining configuration which protrudes transversely away from the filter bellows radially to the element axis in the installation direction.

6. An air filter for filtering a fluid, comprising:

a filter housing, including

at least one inlet for the fluid; and

at least one outlet for the fluid;

at least one filter element according to claim 1 , wherein

the at least one filter element is a flat filter element having open filter bellows made of a filter medium which has an oncoming flow side and an outgoing flow side for the fluid to be filtered;

wherein the at least one filter element is disposed inside the filter housing and separates the at least one inlet from the at least one outlet;

wherein the filter element comprises

at least one longitudinal retaining surface, which is directed with at least one direction component axially to an element axis of the filter element and which is in contact with a corresponding longitudinal mating surface of the filter housing retaining the filter element axially to the element axis;

wherein the filter element comprises at least one transverse retaining surface which is directed with at least one direction component across the element axis, which is separated from the at least one longitudinal retaining surface and which is in contact with a corresponding transverse mating surface of the filter housing for securing the filter element transversely to the element axis.