EP2920806B1 - Bearing unit for rotary anodes of x-ray tubes - Google Patents

Description

The invention relates to a bearing unit for rotary anodes of x-ray tubes. From the DE 30 41 558 A1 For example, from Figure 1 a bearing unit for rotary anodes of X-ray tubes is known, wherein the rotary anode is housed in a partially reproduced evacuated glass bulb
Further examples of a bearing unit for rotary anodes of X-ray tubes are disclosed in US Pat US 2012/144939 A1 . EP 1 843 381 A1 and EP 0 351 225 A2 disclosed.

The invention has for its object to produce a storage unit for such rotary anodes of X-ray tubes, which is particularly easy to install.

This object is achieved by a storage unit having the features of claim 1. Advantageous embodiments are described in the subclaims.

The storage unit according to the invention with the features of claim 1 is compact and consists of a small number of parts, which can be pre-assembled in order to install the thus preassembled storage unit easy to install in the corresponding recess in the X-ray tube.

By the execution of the first bearing elements as angular contact ball bearings, it is possible that the bearing unit can absorb axial forces to some extent. In addition, the use of two angular contact ball bearings eliminates the need for elaborate shaft production. Also, a relatively kostengünster material (eg, unhardened steel) can be used for the shaft.

The spacer elements ensure a positionally secure positioning of the bearing elements on the shaft, wherein the inner spacer element is in contact with the inner rings of the angular contact ball bearings and the outer spacer element is in contact with the outer rings of the angular contact ball bearings.

According to a further advantageous embodiment, an angular contact ball bearing or both angular contact ball bearings with the inner ring on a shoulder of the shaft and are thus fixed easy to install in the axial direction.

By attaching the other bearing element via a particular positive, tapered Verstemmelement and by a plastic deformation of the shaft can take place after attachment of the bearing elements on the shaft locking of the angular contact ball bearings and thus a fixation of the entire storage unit in a simple manner. These are quick and easy fixation options, which are less expensive than fixation solutions, the like on a nut or similar. based.

In an advantageous embodiment, the angular contact ball bearings are oriented opposite to each other, ie, the respective open side of the angular contact ball bearings are either facing each other or facing away from each other. In a particularly preferred manner, the open shoulder of the angular contact ball bearing of the first bearing element is arranged in the direction of the flange end of the shaft and the open shoulder of the angular contact ball bearing of the further bearing element in the direction of the flange distal end of the shaft. This is a particularly advantageous storage, in particular the absorption of axial forces from different axial directions, possible.

According to a further advantageous embodiment, the spacer element arranged between the outer rings and / or the inner rings of the bearing elements may be formed as a divided spacer elements. In this case, a divided spacer element is understood to mean that the spacer element consists of several separate parts (for example a plurality of ring segments). In this way, e.g. a first (e.g., larger) standard sized ring segment may be used, and further one or more precision made spacers to fill the desired distance between the outer rings and / or inner rings of the bearing elements.

Fig. 1

eine schematische Teilschnittansicht einer Lagereinheit; und

Fig. 2

einen vergrößerten Ausschnitt mit einer Lagereinheit gemäß der beanspruchten Erfindung, dessen Verstemmelement durch plastische Verformung der Welle arretiert ist.

The invention is further explained by means of embodiments in the drawing figures. Show it:

Fig. 1

a schematic partial sectional view of a storage unit; and

Fig. 2

an enlarged section with a bearing unit according to the claimed invention, the Verstemmelement is locked by plastic deformation of the shaft.

In the Fig. 1 Pictured bearing unit 1 has a shaft 2 with a flange 3, to which a rotary anode (eg according to DE 30 41 558 A1 ) is attachable.

The entire storage unit 1 can be inserted into a designated and not shown recess of the x-ray tube and locked there in the usual way (eg by screwing).

The bearing unit 1 has to receive the shaft 2, a first bearing element 4 and a further bearing element 5. The first bearing element 4 is formed by an attached to the shaft 2 angular contact ball bearing 6, which has an inner ring 7 and an outer ring 8. The second bearing element 5 is formed by a mounted on the shaft 2 angular contact ball bearing 9, which has an inner ring 10 and an outer ring 11.

The open side of the angular contact ball bearing 6 is formed on the outer ring 8 and is arranged in the direction of the flange-side end of the shaft 2. On the inner ring 7 two shoulders are formed and the side facing away from the flange 3 of the angular contact ball bearing 6 is also formed on the outer ring 8 as a shoulder.

The open side of the angular contact ball bearing 9 is formed on the outer ring 11 and is arranged in the direction of the flange 3 opposite end of the shaft 2. On the inner ring 10 two shoulders are formed and the flange 3 facing side of the angular contact ball bearing 9 is also formed on the outer ring 11 as a shoulder.

The inner rings 7 and 10 are dimensionally exactly spaced by a spacer element 12. Similarly, between the outer rings 8 and 11, a further spacer element 13 is arranged.

The angular contact ball bearing 6 is applied with its inner ring 7 at a shoulder of the shaft 2.

About the mounted on the flange end shaft end caulking 14, the mounted bearing unit 1 is locked. The Verstemmelement 14 is sleeve-shaped. More specifically, the caulking 14 has the shape of a ring or a hollow cylinder.

Fig. 2 shows an enlarged section of a storage unit 201. The storage unit 201 differs from the storage unit 1 only by a differently shaped shaft 202. The other components remain unchanged, so in this regard to the comments on Fig. 1 can be referenced.

The caulking 14 is in the embodiment according to Fig. 2 locked by a plastically deformed end portion 16 of the shaft 202 on the shaft 202. An axial displacement of the Verstemmelements 14 is no longer possible. The components of the bearing unit 201 are thus securely clamped together. The plastic deformation of the end region 16 of the shaft 202 can be carried out, for example, by applying a force directed in the axial direction of the shaft. Apart from the plastically deformed end portion 16, the shaft 202 is identical to the shaft 2 from Fig. 1 ,

LIST OF REFERENCE NUMBERS

1, 201

storage unit

2, 202

wave

3

flange

4, 5

bearing element

6

Angular contact ball bearings

7

inner ring

8th

outer ring

9

Angular contact ball bearings

10

inner ring

11

outer ring

12, 13

spacer

14

caulking

16

deformed end area

Claims (8)

1. Bearing unit (1) for rotary anodes of X-ray tubes, having a shaft (2) and a flange element (3) on which a rotary anode is attachable, wherein

   - the bearing unit (1) is insertable into a receptacle within the X-ray tube and is lockable in place therein,

   - the shaft (2) is received by way of a first bearing element (4) and a further bearing element (5),

   - the first bearing element (4) and the further bearing element (5) are in each case composed of an angular ball bearing (6, 9) which is disposed on the shaft (2) and has an internal ring (7, 10) and an external ring (8, 11),

   - at least one spacer element (12, 13) is attached between the internal rings (7, 10) and/or the external rings (8, 11) of the first and of the second bearing element (4, 5), characterized in that

   - the angular ball bearing (9) of the further bearing element (5) is fastened by way of a bracing element (14) on the shaft (2),

   - the bracing element (14) is configured either as a tapered bracing element, or as a sleeve-shaped bracing element (14), and

   - the bracing element (14) is fixed by way of a plastically deformed end region (16) of the shaft.
2. Bearing unit according to Claim 1, wherein in each case at least one spacer element (12, 13) is attached both between the internal rings (7, 10) and between the external rings (8, 11) of the first and of the second bearing element (4, 5).
3. Bearing unit according to Claim 1, wherein the first bearing element (4) and/or the second bearing element (5) by way of their internal ring (7, 10) bear on a step of the shaft (2).
4. Bearing unit according to one of the preceding claims, wherein the shaft (2) is composed of a non-tempered steel material.
5. Bearing unit according to one of the preceding claims, wherein the angular ball bearings (6, 9) are oriented so as to be mutually opposed.
6. Bearing unit according to one of the preceding claims, wherein the open side of the angular ball bearing (6) of the first bearing element (4) is disposed in the direction of the flange-side end of the shaft (2).
7. Bearing unit according to one of the preceding claims, wherein the open side of the angular ball bearing (9) of the further bearing element (5) is disposed in the direction of that end of the shaft (2) that is opposite the flange (3).
8. Bearing according to one of the preceding claims, wherein the open sides of the angular ball bearings (6, 9) are configured on the respective external ring (8, 11).

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