Fluid dynamic bearing

1. A fluid dynamic bearing system having a stationary bearing component ( 12 ; 22 ) and a moving bearing component ( 14 ; 20 ) that are separated from one another by a bearing gap ( 18 ) filled with a bearing fluid and disposed rotatably with respect to one another about a rotational axis ( 48 ), wherein two radial bearing regions ( 24 ; 26 ) separated axially from one another and marked by radial bearing grooves ( 25 ; 27 ) are provided, wherein a separator region ( 29 ) having a larger bearing gap width is located between the radial bearing regions ( 24 ; 26 ) and wherein the radial bearing grooves ( 25 ; 27 ) of the two radial bearing regions ( 24 ; 26 ) have inner ends facing each other and outer ends facing away from each other, and at least the outer ends of the radial bearing grooves ( 25 ; 27 ) are connected to each other by connecting grooves ( 34 ; 36 ), wherein wear zones ( 38 ; 40 ) are provided adjoining the connecting grooves ( 34 ; 36 ).

2. A fluid dynamic bearing system according to claim 1 , characterized in that the wear zones ( 38 ; 40 ) lie on the same level as the bearing surfaces of the radial bearing regions ( 24 ; 26 ).

3. A fluid dynamic bearing system according to claim 1 , characterized in that the depth of the connecting grooves ( 34 ; 36 ) approximately corresponds to the depth of the radial bearing grooves ( 25 ; 27 ).

4. A fluid dynamic bearing system according to claim 1 , characterized in that the depth of the radial bearing grooves ( 25 ; 27 ) and the connecting grooves ( 34 ; 36 ) is approximately 6+/−2 micrometers.

5. A fluid dynamic bearing system according to claim 1 , characterized in that the wear zones ( 38 ; 40 ) are wider than the respective adjoining connecting grooves ( 34 ; 36 ).

6. A fluid dynamic bearing system according to claim 1 , characterized in that the width of the connecting grooves ( 34 ; 36 ) is approximately 0.1 mm.

7. A fluid dynamic bearing system according to claim 1 , characterized in that the width of the wear zones ( 38 ; 40 ) is approximately 0.25 mm.

8. A fluid dynamic bearing system according to claim 1 , characterized in that the surfaces of the wear zones ( 38 ; 40 ) is provided with a coating.

9. A fluid dynamic bearing system according to claim 8 , characterized in that the coating of the wear zones ( 38 ; 40 ) is a DLC (diamond-like carbon) coating or a nickel coating or an NFC (near frictionless carbon) coating.

10. A fluid dynamic bearing system according to claim 1 , characterized in that the stationary bearing component comprises a bearing bush ( 12 ) and a covering cap ( 22 ), and the moving bearing component comprises a shaft ( 14 ) and a thrust plate ( 20 ), the shaft ( 14 ) and the thrust plate ( 20 ) being rotatably disposed in a bearing bore ( 13 ) in the bearing bush ( 12 ).

11. A fluid dynamic bearing system according to claim 10 , characterized in that the radial bearing grooves ( 25 ; 27 ), the connecting grooves ( 34 ; 36 ) and the wear zones ( 38 ; 40 ) are disposed on the bearing bush ( 12 ).

12. A fluid dynamic bearing system according to claim 11 , characterized in that the surface of the bearing bore ( 13 ) in the bearing bush ( 12 ) is given a full coating or at least coated in the region of the wear zones ( 38 ; 40 ).

13. A fluid dynamic bearing system according to claim 10 , characterized in that an axial bearing region ( 28 ) is formed between the thrust plate ( 20 ) and the bearing bush ( 12 ) and/or an axial bearing region ( 30 ) is formed between the thrust plate ( 20 ) and the covering cap ( 22 ).

14. A fluid dynamic bearing system according to claim 10 , characterized in that the diameter of the shaft ( 14 ) is between 3 and 4 mm.

15. A fluid dynamic bearing system according to claim 10 , characterized in that the thrust plate ( 20 ) is integrally formed with the shaft ( 14 ) as one piece.

16. A fluid dynamic bearing system according to claim 10 , characterized in that the thrust plate ( 20 ) has at least one hole ( 42 ) extending approximately parallel to the rotational axis ( 48 ), and that the thrust plate ( 20 ) has a recess ( 50 ) in the exit region of the hole ( 42 ).

17. A fluid dynamic bearing system according to claim 1 , characterized in that the surface of the shaft ( 14 ) is given a full coating or at least coated in the region lying opposite the wear zones ( 38 ; 40 ).

18. A fluid dynamic bearing system according to claim 1 , characterized in that at least one recirculation channel ( 43 ) is disposed in the moving bearing component ( 14 ; 20 ), the recirculation channel ( 43 ) connecting the region of the lower end face of the moving bearing component to the separator region ( 29 ).

19. A fluid dynamic bearing system according to claim 18 , characterized in that the recirculation channel ( 43 ) in the moving bearing component ( 14 ; 20 ) extends obliquely to the rotational axis ( 48 ).

20. A spindle motor having a stator and a rotor and a fluid dynamic bearing system for the rotatable support of the rotor ( 16 ), and an electromagnetic drive system ( 44 ; 46 ), wherein the fluid dynamic bearing system comprises a stationary bearing component ( 12 ; 22 ) and a moving bearing component ( 14 ; 20 ) that are separated from one another by a bearing gap ( 18 ) filled with a bearing fluid and disposed rotatably with respect to each other about a rotational axis ( 48 ), wherein two radial bearing regions ( 24 ; 26 ) separated axially from one another and marked by radial bearing grooves ( 25 ; 27 ) are provided, wherein a separator region ( 29 ) having a larger bearing gap width is located between the radial bearing regions ( 24 ; 26 ) and wherein the radial bearing grooves ( 25 ; 27 ) of the two radial bearing regions ( 24 ; 26 ) have inner ends facing each other and outer ends facing away from each other, and at least the outer ends of the radial bearing grooves ( 25 ; 27 ) are connected to each other by connecting grooves ( 34 ; 36 ), wherein wear zones ( 38 ; 40 ) are provided adjoining the connecting grooves ( 34 ; 36 ).