Rotating-anode bearing and a rotating anode for an x-ray tube and a method for manufacturing a rotating-anode bearing for an x-ray tube

Patent metadata

Field	Value
Publication number	US-11328891-B2
Application number	US-201916691567-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Nov 23, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

The disclosure relates to a rotating-anode bearing for an X-ray tube
comprising a rotor shaft extending along a longitudinal axis from a first axial end to a second axial end and supported to be rotatable about the longitudinal axis; wherein the rotor shaft has an anode holder in the area of the first axial end; and the anode holder comprises a flange which has a larger diameter than at least an adjacent section of the rotor shaft.

The rotating-anode bearing according to the disclosure wherein the rotor shaft together with the flange is made as an integrally forged part.

First claim

The invention claimed is:

1. A rotary support of a rotary anode for an X-ray tube
comprising a rotor shaft extending along a longitudinal axis from a first axial end to a second axial end and supported to be rotatable about the longitudinal axis; wherein
the rotor shaft has an anode holder in the area of the first axial end; and
the anode holder comprises a flange which has a larger diameter than at least an adjacent section of the rotor shaft;
wherein
the rotor shaft together with the flange is made as an integrally forged part.

2. The rotary support of a rotary anode for an X-ray tube according to claim 1 , wherein the flange forms the greatest diameter of the rotor shaft.

3. The rotary support of a rotary anode for an X-ray tube according to claim 2 , wherein the diameter of the flange is at least 1.2 times the diameter of the adjacent section of the rotor shaft.

4. The rotary support of a rotary anode for an X-ray tube according to claim 1 , wherein in each of the area of the first axial end and the area of the second axial end at least one antifriction bearing is provided and the rotor shaft forms a bearing inner ring of the antifriction bearings including an area on which rolling elements of the antifriction bearings roll; and
a surface of the rotor shaft is hardened at least in the area on which rolling elements of the antifriction bearings roll.

5. The rotary support of a rotary anode for an X-ray tube according to claim 1 , wherein the rotor shaft is austenitized, or through-hardened by austenitizing in combination with quenching, at least in an inner core.

6. The rotary support of a rotary anode of any of claims 1 - 5 in combination with:
a rotor and a stator enclosing the rotor at a distance in the circumferential direction, wherein the rotor and the stator interact electromagnetically with each other, in such a manner that the rotor can be made to rotate by applying an electromagnetic field by means of the stator, wherein the rotor has a cup-shaped configuration, encloses the rotor shaft in the circumferential direction and is coupled to a first axial end of the rotor shaft;
an anode disc, provided with anode material, coupled to a first axial end of the rotor shaft and/or to the rotor; and
a stationary housing which is enclosed by the stator, wherein the anode disc is coupled to the rotor shaft.

7. A method for manufacturing a rotating-anode bearing for an X-ray tube, comprising a rotor shaft extending along a longitudinal axis from a first axial end to a second axial end and supported to be rotatable about the longitudinal axis and having, in the area of the first axial end, an anode holder comprising a flange, comprising:
integrally forging the rotor shaft together with the flange.

8. The method according to claim 7 , wherein the step of integrally forging the rotor shaft together with the flange comprising the step of integrally forging the rotor shaft together with the flange from a rod-like billet having an outer diameter that is larger than the outer diameter of the finished rotor shaft in the area of the second axial end, the rod-like billet having an outer diameter that is smaller than an outer diameter of the flange.

9. The method according to claim 7 , further comprising the step of austenizing the rotor shaft together with the flange after the integrally forging step.

10. The method according to claim 7 , further comprising the step of machining the rotor shaft together with the flange after the integrally forging step.

11. The rotating-according to claim 2 , wherein in each of the area of the first axial end and the area of the second axial end at least one antifriction bearing is provided and the rotor shaft forms a bearing inner ring of the antifriction bearings including an area on which rolling elements of the antifriction bearings roll; and
a surface of the rotor shaft is hardened at least in the area on which rolling elements of the antifriction bearings roll.

12. The rotating-according to claim 3 , wherein in each of the area of the first axial end and the area of the second axial end at least one antifriction bearing is provided and the rotor shaft forms a bearing inner ring of the antifriction bearings including an area on which rolling elements of the antifriction bearings roll; and
a surface of the rotor shaft is hardened at least in the area on which rolling elements of the antifriction bearings roll.

13. The rotating-according to claim 2 , wherein the rotor shaft is austenitized, or through-hardened by austenitizing in combination with quenching, at least in an inner core.

14. The rotating-according to claim 3 , wherein the rotor shaft is austenitized, or through-hardened by austenitizing in combination with quenching, at least in an inner core.

15. The rotating-according to claim 4 , wherein the rotor shaft is austenitized, or through-hardened by austenitizing in combination with quenching, at least in an inner core.

16. The method according to claim 8 , further comprising the step of austenizing the rotor shaft together with the flange after the integrally forging step.

17. The method according to claim 8 , further comprising the step of machining the rotor shaft together with the flange after the integrally forging step.

18. The combination of claim 6 , wherein the anode disc is coupled to the flange of the rotor shaft.

19. The combination of claim 18 , wherein the anode disc is coupled to the flange of the rotor shaft via the rotor, whereby the rotor is intermediate the flange of the rotor shaft and the anode disc.

20. The combination of claim 18 , wherein the flange forms the anode disc.

Assignees

• Minebea Mitsumi Inc

Inventors

• Muller Peter Andreas

Classifications

• H01J35/1017 Primary

  Bearings for rotating anodes · CPC title

• B23P15/003

  bearings (see also F16C33/00) · CPC title

• B21J1/04

  Shaping in the rough solely by forging or pressing · CPC title

• H01J35/108

  Substrates for and bonding of emissive target, e.g. composite structures · CPC title

• H01J2235/102

  Materials for the shaft · CPC title