Brake dust collecting device for motor vehicles

1. A brake dust collecting device for motor vehicles, the brake dust collecting device comprising:

a dust collecting unit;

an air flow generating device that generates an air flow that flows across brake parts of a motor vehicle wheel brake and that supplies brake dust of the wheel brake to said dust collecting unit;

wherein said air flow generating device comprises at least one rotatable fan blade,

wherein said dust collecting unit comprises a filter element,

wherein said air flow generating device is arranged within the interior of a wheel rim, said air flow generating device positioned behind an inner side of the wheel rim between axial end faces of the wheel rim and said brake parts,

wherein said dust collecting unit is seated on a wheel bearing casing of said motor vehicle and extends radially outwards resting seal-tightly against an axial end face of said wheel rim to form a flow-tight closure between said dust collecting unit and said wheel rim, said flow-tight closure of said dust collecting unit with said wheel bearing casing and said wheel rim end face providing a flow-tight closure of interior space of said wheel rim that forms an unfiltered side of said filter element,

wherein said dust collecting unit includes an annular sealing element arranged on a radially outwardly positioned shoulder of said dust collecting unit, said annular sealing element resting seal-tightly against said axial end face of said wheel rim, said annular sealing element effecting said flow-tight closure preventing leak flows between said dust collecting unit and said wheel rim, and

wherein said filter element is arranged such that said air flow generated by said air flow generating device flows through and is filtered by said filter element of said dust collecting unit.

2. The brake dust collecting device according to claim 1 , wherein said at least one fan blade is a plurality of fan blades distributed circumferentially.

3. The brake dust collecting device according to claim 2 , wherein

said air flow generating device comprises a fan ring,

wherein said plurality of fan blades are arranged on said fan ring, and

wherein said fan ring and said plurality of fan blades form a fan wheel.

4. The brake dust collecting device according to claim 1 , wherein said at least one fan blade is arranged on an inner side of said wheel rim or of a component that is fixedly coupled to said wheel rim.

5. The brake dust collecting device according to claim 4 , wherein said fan blade is connected fixedly to said wheel rim.

6. The brake dust collecting device according to claim 4 , wherein said fan blade is formed by a web of said wheel rim.

7. The brake dust collecting device according to claim 4 , wherein

said fan blade is rotatably supported on said wheel rim or on said component and

wherein said fan blade and said wheel rim or said component rotate about a same axis of rotation.

8. The brake dust collecting device according to claim 7 , wherein said air flow generating device comprises a centrifugal mass element that is arranged on said fan blade or on a fan wheel of which said fan blade is a part.

9. The brake dust collecting device according to claim 8 , wherein said centrifugal mass element is adjustable in a radial direction on said fan blade.

10. The brake dust collecting device according to claim 9 , wherein said centrifugal mass element is adjustably secured by a spring element on said fan blade.

11. The brake dust collecting device according to claim 7 , wherein

said fan blade comprises a locking device that has a locking position and a release position,

wherein said locking device is in said locking position below an acceleration threshold and is in said release position above said acceleration threshold,

wherein in said locking position said fan blade is fixedly coupled to said wheel rim and in said release position said fan blade is movable relative to said wheel rim.

12. The brake dust collecting device according to claim 1 , wherein said filter element is electrostatic.

13. The brake dust collecting device according to claim 12 , wherein electrical voltage is supplied to said filter element as a function of momentary state parameters and operating parameters.

14. The brake dust collecting device according to claim 12 , wherein during a braking process electrical voltage is supplied to said filter element.

15. The brake dust collecting device according to claim 1 , wherein said filter element is fixedly mounted on said wheel bearing casing.

16. The brake dust collecting device according to claim 1 , wherein said sealing element is fixedly connected to said filter element.

17. The brake dust collecting device according to claim 1 , wherein said sealing element is connected fixedly to said wheel rim.

18. The brake dust collecting device according to claim 1 , further comprising an electric pump for producing or enhancing said air flow.