DE9405079U1 - Spindle bearing with filling gap - Google Patents

Description

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Applicant: Company PM ⁰ DM Prec. Motors Dt. Minebea GmbH, Max-Planck-Str. 14, 78549 Spaichingen

Spindle bearing with sinfill gap

The subject of the present innovation is a spindle bearing according to the generic term of claim 1. Spindle bearings of this type are known in many different designs. Essentially, such a bearing consists of a shaft that is held by two separate ball bearing systems, each ball bearing system consisting of an outer ring and an inner ring with balls in between.

The bearing systems are located separately on the shaft. Usually two such bearing systems are provided, with the balls running individually between the outer ring and inner ring and additionally being held together by a ball cage. As a rule, either the outer ring or the inner ring is connected to the housing or the shaft in a rotationally fixed manner.

Usually the balls are filled in by moving the shaft eccentrically to the outer ring. This creates a crescent-shaped space on one side that has a larger diameter than the balls. The balls are then filled in there and moved to the right and left, with as many balls being filled in until the available space is completely filled and no more balls can be inserted. However, the

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The number of balls that can be inserted is limited, so that when the shaft is then returned to its central position, the balls are distributed over the entire circumference, but effectively only a fraction of the maximum number of balls that can be inserted are in the bearing.

This has the disadvantage that the bearing can never be filled with the maximum possible number of balls, so that the precision of the ball bearing suffers.

The aim of this innovation is therefore to further develop a ball bearing of the type mentioned above in such a way that as many balls as possible can be introduced into the bearing in a simple manner.

To solve the problem posed, the innovation is characterized by the technical teaching of claim 1.

The key feature of the innovation is that the new ball bearing system allows so many balls to be inserted that the entire available space is filled with balls and the balls can even touch each other.

This is achieved by allowing the entire shaft and/or the inner ring to be moved, thereby exposing the respective ball bearing, ie the "ball chamber ^11" is opened to one side and balls can be filled in through a filling gap.

This has the significant advantage that the shaft no longer has to be moved eccentrically to fill the balls, which was previously the case with precision bearings.

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is difficult due to the narrowly defined tolerances. Furthermore, the smooth running and accuracy of the bearing is increased because the maximum possible number of balls can be filled without difficulty.

This is a bearing system, i.e. the bearing does not have to be constructed from two identical bearing halves, so that the outer ring can be made as one piece and does not have to be glued together from two parts. This significantly increases the accuracy and precision of the bearing.

According to the innovation, it is of course possible to place the balls for the upper and lower bearing in a ball cage before assembly and then to insert the two ball arrangements into the bearing in one step.

However, it is also possible to provide a common ball cage for the upper and lower bearings and then insert this completely into the system from below.

This method of filling the balls represents a significant improvement in achieving high-quality ball bearings.

The subject matter of the present innovation arises not only from the subject matter of the individual protection claims, but also from the combination of the individual protection claims with one another.

All documents, including the summary, disclosed information and features, in particular the spatial design shown in the drawings, are claimed as essential to the invention, insofar as they are individually

7541.2-P375-ku .-4-5*: :. *' "I "I* 23.03.1994

or in combination are new compared to the state of the art.

The subject matter of the present invention arises not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another. All information and features disclosed in the documents, including the summary, in particular the spatial design shown in the drawings are claimed as essential to the invention, insofar as they are new individually or in combination compared to the prior art.

Show it:
15

Figure 1: a section through the bearing arrangement after assembly;

Figure 2: a section through the bearing arrangement with the shaft offset upwards;

Figure 3: a section through the bearing arrangement with the inner ring offset downwards;

Figure 4: a section through the bearing arrangement with the inner ring completely pulled out,

Figure 5: a section through the bearing arrangement under

Use of a ball cage, 30

Figure 6: a section through the bearing arrangement with another embodiment of a ball cage.

The renewed bearing - as shown in Figure 1

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- consists essentially of a shaft 1, which is arranged so as to rotate via an upper bearing 9 and a lower bearing 10 within the outer ring 2. This outer ring 2 is connected in a rotationally fixed manner to the supporting housing 4.

Furthermore, there are a number of balls 5 distributed over the circumference of the shaft 1, which run in the upper bearing 9 between the shaft 1 and the outer ring 2, and in the lower bearing 10 between an inner ring 3 connected to the shaft 1 in a rotationally fixed manner and the outer ring 2.

In the assembled state, the balls 5 run between the inner ring 3 and the outer ring 2 or between the shaft 1 and the outer ring 2 and are held in position by the shoulders 8 on the outer ring and the shoulders 7 on the shaft 1 and the inner ring 3. The balls can run loosely in the bearings 9, 10 or be held together by a ball cage 14 (Figures 1 and 6).

The bearings 9, 10 are each closed at the top and bottom by a seal 6, which prevents the ingress of dirt or mechanical impact on the balls.

What is new now is that - as shown in Figure 2 - to fill the balls 5 into the upper bearing 9, the shaft 1 is simply moved upwards in the direction of arrow 11, whereby the shoulder 7 is also moved upwards and thus access to the ball bearing space is possible.

Now - as indicated in Figure 2 - the balls 5 can be easily filled into the space provided, whereby the entire space distributed around the circumference can be filled. The shoulder 8 prevents the balls from falling through, i.e. the balls 5 are held in their intended position.

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When the ball space is full, the shaft 1 is returned to its normal position and the sealing ring 6 is applied, completing the assembly.

Figure 3 shows the filling of the lower bearing 10. The inner ring 3 can be moved in the direction of the arrow 12 so that access to the ball space is possible.
As already explained when filling the upper bearing 9, the balls 5 can now be filled in (or removed) and are again held by the shoulder 8 attached to the outer ring 2. Once all the balls have been filled in, the inner ring 3 is pushed back into its normal position, the sealing ring 6 is put on and the assembly is thus completed.

This completes the assembly of the complete bearing, as shown in Figure 1.

As already mentioned, the balls 5 of the upper and/or lower bearing 9, 10 can each be held in a ball cage, so that assembly is very simple, for example by pulling out the shaft 1 to fill the upper bearing, inserting the complete ball cage into the ball space and pushing the shaft 1 back into its normal position.

Figures 5 and 6 show how the balls 5 of the upper bearing 9 and the lower bearing 10 are each held in a ball cage 14.

For example, according to Figure 5, a one-piece ball cage 14 is used, whereby the balls are "clipped" into it and thus held.
In Figure 6, a two-part ball cage 14 is used, which is composed of two ball cage halves 15

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is.

A special feature of the innovation is that it is also possible to hold the balls 5 of the upper bearing 9 and the lower bearing 10 in just one common ball cage. To do this, the individual ball cages 14 shown in Figures 5 and 6 are connected to one another, e.g. by means of connecting webs, to form a single ball cage. To fill it, the inner ring 3 is then pulled out completely in the direction of arrow 12. At the same time, the entire shaft is moved upwards in the direction of arrow 11. The entire ball cage can then be inserted from below in the direction of arrow 11, after which the shaft 1 and the inner ring 3 are returned to their normal position. Both bearings are thus mounted and the seals 6 can be attached. This allows the ball bearings to be filled with just a few assembly steps.

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Drawing legend

I Wave

2 Outer ring

3 Inner ring

4 Housing

5 balls

6 Sealing ring 7 Paragraph

8 paragraph

9 upper bearing

10 lower bearing

II Arrow direction 12 Arrow direction

13 Filling gap

14 Ball cage

15 Ball cage half

Claims (8)

PATENT ATTORNEY :··;· 23.03.1994 Dipl.-Ing.
EUROPEAN PATENT ATTORNEY 05 PO Box 3160 D-88113 Lindau (Bodensee) Telephone (08382)78025 Fax (08382)78027 10 P 375-54-ku Applicant: PM°DM Prec.Motors Dt.Minebea GmbH Max-Planck-Str. 14, 78549 Spaichingen al protection claims In J ^ä l. Spindle bearing with filling gap, in particular precision bearing, wherein a shaft (1) is rotatably mounted in a housing (4) via two ball bearings (9,10), characterized in that the shaft (1) and the inner ring (3) are displaceable relative to the housing (4), and thereby the respective ball bearing (9,10) is exposed. 2. Spindle bearing with filling gap according to claim 1, characterized in that a filling gap (13) for the balls (5) is created by moving the shaft (1) and/or the inner ring (3). 3. Spindle bearing with filling gap according to claim 1, characterized in that the Telex: Home address: .. . Bank account: .. .... .. Postal cheque account 43 74 (patent-d) RennerlelO } Il . JBa^iJ ygrelijsba«kUn(ta»(B) Wr. 1257 110 (bank code 600 202 90) Munich Telegram address: D-88131 Lindau "J ··;· ·&EEgr;&ggr;&bgr;&ogr;-&Bgr;8&idiagr;*&udigr;&eegr;<1«&idiagr;!{&Bgr;&Ggr;&Ngr;&Ggr;.*6&&Lgr;)-326 843 (bank code 73320442) 414848-808 7541.2-P375-kU .-* 2 -: * : C. I'"l"V 23.03.1994 Bearings (9,10) have a common outer ring (3). 4. Spindle bearing with filling gap according to one of claims 1-3, characterized in that the bearings (9, 10) can be filled with the maximum possible number of balls (5). 5. Spindle bearing with filling gap according to one of claims 1-4, characterized in that the balls (5) are each held by a shoulder (8) of the outer ring (2) and a shoulder (7) on the inner ring (3) and the shaft (1). 6. Spindle bearing according to one of claims 1-5, characterized in that the balls (5) of the upper bearing (9) are held in a ball cage (14). 7. Spindle bearing according to one of claims 1 - 6, characterized in that the balls (5) of the lower bearing (10) are held in a ball cage (14). 8. Spindle bearing with filling gap according to one of claims 1-5, characterized in that the balls (5) of the upper bearing (9) and the balls (5) of the lower bearing (10) are held in a common ball cage.