Disc-brake vibration damper

1. Disk brake vibration damper comprising a piston ( 3 ) intended to apply an axial braking pressure (F 1 ) to a brake pad ( 2 ), the piston having a face ( 33 ) engageable with the brake pad, characterized in that the damper also comprises a cylindrical element ( 4 ) having a face ( 40 ) engageable with the brake pad and a cylindrical peripheral surface ( 41 ), the peripheral surface having thereon a layer of a supple material ( 5 ) which exhibits properties of adhesion with the materials of the piston and of the cylindrical element, said cylindrical element ( 4 ) being positioned inside an axial cavity ( 30 ) of the piston with said layer of supple material ( 5 ) in contact with an interior wall ( 31 ) of the cavity of the piston ( 3 ), the cylindrical element ( 4 ) sliding in said cavity ( 30 ) of the piston as the face of the piston moves into and out of engagement with the brake pad.

2. Disk brake vibration damper according to claim 1 , characterized in that said layer of supple material ( 5 ) that exhibits properties of adhesion of the materials of the piston and of the cylindrical element is made of a viscous material.

3. Disk brake vibration damper according to claim 2 , characterized in that the layer of viscous material ( 5 ) is made of a viscoelastic material.

4. Disk brake vibration damper according to claim 1 , characterized in that said cylindrical element ( 4 ) is a cylindrical ring.

5. Disk brake vibration damper according to claim 4 , characterized in that the cylindrical element has a cylindrical wall providing the cylindrical peripheral surface and an inner end face ( 42 ) sealing the cavity ( 30 ).

6. Disk brake vibration damper according to claim 1 , characterized in that said cylindrical element ( 4 ) is made of a metallic material.

7. Disk brake vibration damper according to claim 1 , characterized in that said cylindrical element ( 4 ) is made of a plastic.

8. Disk brake vibration damper according to claim 1 , characterized in that, under no braking, the face ( 40 ) of the cylindrical member ( 4 ) emerges from the face ( 33 ) of the piston ( 3 ) by a distance (d), and in that, under braking, a distance between the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) decreases.

9. Disk brake vibration damper according to claim 1 , characterized in that, under braking, the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) are aligned in a plane.

10. Vehicle wheel brake piston ( 3 ) intended to apply an axial braking pressure (F 1 ) to a brake pad ( 2 ), the piston having a face ( 33 ) engageable with the brake pad, the piston also comprising a disk brake vibration damper including a cylindrical element ( 4 ) having a face ( 40 ) engageable with the brake pad and a cylindrical peripheral surface ( 41 ), the peripheral surface having thereon a layer of a supple material ( 5 ) which exhibits properties of adhesion with the materials of the piston and of the cylindrical element, said cylindrical element ( 4 ) being positioned inside an axial cavity ( 30 ) of the piston with said layer of supple material ( 5 ) in contact with an interior wall ( 31 ) of the cavity of the piston ( 3 ), the cylindrical element ( 4 ) sliding in said cavity ( 30 ) of the piston as the face of the piston moves into and out of engagement with the brake pad.

11. Vehicle wheel brake piston according to claim 10 , characterized in that said layer of supple material ( 5 ) that exhibits properties of adhesion of the materials of the piston and of the cylindrical element is made of a viscous material.

12. Vehicle wheel brake piston according to claim 11 , characterized in that the layer of viscous material ( 5 ) is made of a viscoelastic material.

13. Vehicle wheel brake piston according to claim 10 , characterized in that said cylindrical element ( 4 ) is a cylindrical ring.

14. Wheel brake piston according to claim 13 , characterized in that the cylindrical element has a cylindrical wall providing the cylindrical peripheral surface and an inner end face ( 42 ) sealing the cavity ( 30 ).

15. Vehicle wheel brake piston according to claim 10 , characterized in that said cylindrical element ( 4 ) is made of a metallic material.

16. Vehicle wheel brake piston according to claim 10 , characterized in that said cylindrical element ( 4 ) is made of a plastic.

17. Wheel brake piston according to claim 10 , characterized in that, under no braking, the face ( 40 ) of the cylindrical member ( 4 ) emerges from the face ( 33 ) of the piston ( 3 ) by a distance (d), and in that, under braking, a distance between the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) decreases.

18. Wheel brake piston according to claim 10 , characterized in that, under braking, the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) are aligned in a plane.

19. Vehicle disk brake, comprising a brake pad ( 2 ), and a wheel brake piston for applying an axial braking pressure (F 1 ) to the brake pad ( 2 ), the piston having a face ( 33 ) engageable with the brake pad, the brake also comprising a vibration damper including a cylindrical element ( 4 ) having a face ( 40 ) engageable with the brake pad and a cylindrical peripheral surface ( 41 ), the peripheral surface having thereon a layer of a supple material ( 5 ) which exhibits properties of adhesion with the materials of the piston and of the cylindrical element, said cylindrical element ( 4 ) being positioned inside an axial cavity of the piston with said layer of supple material ( 5 ) in contact with an interior wall ( 31 ) of the cavity of the piston ( 3 ), the cylindrical element ( 4 ) sliding in said cavity ( 30 ) of the piston as the face of the piston moves into and out of engagement with the brake pad.

20. Vehicle disk brake according to claim 19 , characterized in that said layer of supple material ( 5 ) that exhibits properties of adhesion of the materials of the piston and of the cylindrical element is made of a viscous material.

21. Vehicle disk brake according to claim 20 , characterized in that the layer of viscous material ( 5 ) is made of a viscoelastic material.

22. Vehicle disk brake according to claim 19 , characterized in that said cylindrical element ( 4 ) is a cylindrical ring.

23. Vehicle disk brake according to claim 22 , characterized in that the cylindrical element has a cylindrical wall providing the cylindrical peripheral surface and an inner end face ( 42 ) sealing the cavity ( 30 ).

24. Vehicle disk brake according to claim 19 , characterized in that said cylindrical element ( 4 ) is made of a metallic material.

25. Vehicle disk brake according to claim 19 , characterized in that said cylindrical element ( 4 ) is made of a plastic.

26. Vehicle disk brake according to claim 19 , characterized in that, under no braking, a face ( 40 ) of the cylindrical member ( 4 ) emerges from the face ( 33 ) of the piston ( 3 ) by a distance (d), and in that, under braking, a distance between the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) decreases.

27. Vehicle disk brake according to claim 19 , characterized in that, under braking, the face ( 40 ) of the cylindrical member ( 4 ) and the face ( 33 ) of the piston ( 3 ) are aligned in a plane and engage the brake pad.

28. Vehicle disk brake according to claim 19 , characterized in that the brake pad includes a brake pad lining engageable against a brake disk and a backing plate, during braking, the face of the piston and the face of the cylindrical member engaging the backing plate.