DE102006033777A1 - Bearing set a rolling bearing mounted in a housing with front play rotor and method for its assembly - Google Patents

Abstract

The invention relates to a bearing set (1) of a roller bearing of a rotor (32; 33) mounted in a housing (34) with end play (37; for example, a screw compressor (31), the bearing set (1) consisting of an axially outer ball bearing (2 4) and consists of an axially inner cylindrical roller bearing (3), the inner rings (6, 15) in the installed state rotationally fixed on a rotor shaft (38, 39) are mounted. In order to enable a simplified and more accurate assembly of such a bearing set, it is provided that the cylindrical roller bearing (3) is designed separable and an outer ring (14) with a single axially outer board (20) and an inner ring (15) with a single axially inner Board (23), wherein between the inner ring (15) and outer ring (14) arranged set of cylindrical rollers (16) axially of the rims (20, 23) of outer ring (14) and inner ring (15) is limited. The invention is further based on a method for mounting a bearing set (1) on the rotor shaft (38; 39) of, for example, a screw compressor (31), in which, in a first step, the ball bearing (2; 4) and cylindrical roller bearing (3) Bearing set (1) on the vertically arranged rotor shaft (38; 39) pushed and the rotor shaft (38; 39) loaded with a vertical force and an axial distance (37) of the rotor (32; 33) to the housing end wall (36) and the distance at least the inner rings (6, 15) of the bearing set (1) to a contact surface (40) of the bearing ...

Description

Field of the invention

The The invention relates to a bearing set of a roller bearing one in a housing with end play mounted rotor, for example, a screw compressor, wherein the bearing set from an axially outer ball bearing and consists of an axially inner cylindrical roller bearing, the inner rings in the installed state rotatably on a rotor shaft are stored.

Background of the invention

A generic bearing set is for example from the US 4, 465, 446 known. The bearing set described therein a rotor shaft mounted on two sides consists of an axially outwardly disposed ball bearing and an axially inner cylindrical roller bearing whose inner rings are firmly clamped in the installed state against a stop collar of the shaft journal, while biasing a force acting on the outer rings of the rolling element spring element, there in Shape of a plate spring. The ball bearing and the cylindrical roller bearing are separated on the side of the inner rings by a spacer, wherein in the resulting space, the plate spring and a radially inwardly extending leg of an L-shaped bearing element are arranged. The axially lying leg of the bearing element extends beyond the width of the outer ring of the cylindrical roller bearing and has a radial distance from the outer ring. The ball bearing used there is designed as a so-called QJ bearing, ie as a four-point bearing, while the cylindrical roller bearing is designed as a so-called NU bearing, that has an outer ring with two outer rims and a bordlosen inner ring.

In the unpublished German patent application DE 10 2005 054 705.2 a bearing set of a rolling bearing mounted in a housing with front play rotor of a screw compressor is also described, wherein the bearing set consists of an axially outer ball bearing and an axially inner cylindrical roller bearing, the inner rings are rotatably mounted in the installed state on a shaft of the rotor. The ball bearing is designed there either as angular contact ball bearings or as a four-point bearing, while the cylindrical roller bearing is designed either as a NU bearing or as an NJ bearing. In an NJ bearing is a cylindrical roller bearing whose outer ring has two axially outer rims, which surround the cylindrical rollers, while its inner ring has only an axially outer board, which is directed in the installed state to the run-up collar of the rotor shaft.

From the DE 197 16 549 A1 a screw compressor for stationary or mobile compressors is known, which has a bearing set consisting of a QJ ball bearing and a NU cylindrical roller bearing. Screw compressors for which such bearing sets are primarily used are particularly difficult to assemble with a view to correctly adjusting a gap between a housing and the intermeshing rotors which are formed as a rib rotor and Nutenrotor. Usually, such screw compressors are first provisionally assembled with at least one bearing set, whereupon the axial clearance between the rotors and the housing is measured. Thereafter, the screw compressor is partially disassembled and it be used according to the previously measured game distance or shims between the bearing set and the associated contact surface, after which the compressor is then finally mounted and the rotors have the desired game. This type of game adjustment is both time consuming and cumbersome, apart from the fact that it is difficult in certain designs to measure the axial play of the rotors in the assembled state, and on the other hand, this game setting offers no possibility of adjustment without re-disassembly.

Several attempts have already been made to replace this time-consuming process. From the DE 25 31 414 A1 For example, is a device for adjusting the axial clearance of rotors in a housing, in particular for rotary engines with a cage rotor and arranged within this and meshing therewith with this combing rotor and known for screw compressors, in which a thrust bearing of a rotor surrounding sleeve with a on the inside inwardly projecting collar is provided, against which abuts the thrust bearing, which is supported on an abutment on the rotor shaft, wherein the sleeve is fixed by an external thread in the housing or a housing part and is rotatable from the outside of the housing.

A similar solution is from the DE 90 15 876 U1 known. In both solutions, attempts are made in the simplest, but at the same time exact manner to mount a plate spring so that the exact clearance between the rotor and housing on the one hand and between the bearing set and housing can be adjusted by this.

Of the Disadvantage of such solutions can be seen in the fact that the axial play can change over the operating time, because disc springs tire in the long run. Therefore, an improvement of bearing sets and corresponding mounting method sought, the conventional Use assembly facilities.

It is common Practice that manufacturers of screw compressors measuring the gap between rotor and housing when mounting in vertical rotor position. These Procedure is when using ball bearings as thrust bearings unproblematic because ball bearings are capable of measuring to absorb high axial forces occurring in a vertical position. However, if a cylindrical roller bearing absorbs axial forces, it is due to the lack of radial load to tilt the rollers during the Measurement. This tilting leads to a measurement error, as the wave continues to shift thereby leaves as this possible without tilting would.

Object of the invention

Of the Invention is based on the object, a bearing set and a method to create his assembly, which the disadvantages described remove. In particular, a bearing set is to be provided, which is simple and occurring during operation Axial and radial forces can safely record. The procedure for mounting the bearing set should be a precise Setting an axial distance of the bearing set to a rotor shaft enable.

Summary of the invention

Of the Invention is based on the finding that the asked Task on surprisingly simple Solve it by way of fashion leaves, the cylindrical roller bearing has an outer ring and an inner ring each having only an axially outer or inner Board, whereby a bearing set is provided, in which at least the cylindrical roller bearing is designed removable.

The The invention is therefore based on a bearing set of a rolling bearing one in a housing with Front play mounted rotor, for example, a screw compressor, wherein the bearing set from an axially outer ball bearing and consists of an axially inner cylindrical roller bearing, the inner rings in the installed state rotatably on a rotor shaft are stored. In addition, it is provided that the cylindrical roller bearing dismountable is formed and an outer ring with a single axially outer board and having an inner ring with a single axially inner rim, wherein the arranged between inner ring and outer ring set of Cylindrical rollers axially bounded by the rims of outer ring and inner ring is.

By This structure is advantageously achieved that by the complete dismantling at least the cylindrical roller bearing in different stages of the provisional assembly and subsequent final assembly of the bearing set completely new and surprising possibilities result. Because of that outer ring and inner ring each having only a single board, can be not just the outer ring remove from the inner ring, which alone is an advance in terms a simpler and faster assembly is, it can now also the set of cylindrical rollers easily from the outer ring or separate from the inner ring, which in otherwise conventional NU or NJ cylindrical roller bearings whose outer rings each have two shelves, is not possible. Because of that Cylindrical rollers can be easily inserted into the cylindrical roller bearing or can be removed, what according to one Method for mounting the bearing set is provided, the cylindrical rollers against a measure ring be exchanged and vice versa.

In addition, can be provided that an outer career of the outer ring axially inward of a conical extension, for example one Insertion bevel, and axially outside is bounded by the radially inwardly projecting axially, outboard board, and that the inner ring has an inner race which axially Outside from a conical extension, for example an insertion bevel, and axially inwardly bounded by a radially inwardly projecting board.

In Other practical developments may be provided that the Cylindrical rollers have an axial distance to at least one board.

A Another embodiment of the invention provides that the ball bearing is a four-point bearing or a deep groove ball bearing.

In a particularly practical development of the invention is provided that the ball bearing is an angular contact ball bearing which is an outer ring with a radial shoulder and an inner ring with a radial Shoulder, wherein the shoulders axially spaced apart are and axially limit bearing balls. Even if the use of a Four-point bearing is within the scope of the invention, it has yet an angular contact ball bearing proved to be particularly practical. Because it points to the axial displaceability of outer ring and inner ring similar to each other Properties on how the inventive cylindrical roller bearing, at which it is otherwise is a quasi-abnormal NJ camp.

These Design leaves to complement each other that the angular contact ball bearing is designed dismantled.

The invention is also based on a method for mounting a bearing set on the rotor shaft, for example a screw compressor Ters, in which in a first step consisting of ball bearings and cylindrical roller bearing set pushed onto a vertically arranged rotor shaft and the rotor shaft is loaded with a vertical force, and in which an axial distance of the rotor to the housing end wall and / or the distance of at least the inner rings of Bearing set is measured to a contact surface of the rotor shaft, and in which the bearing set is removed from the rotor shaft in a second step and machined after disassembly of the bearing set for correcting the axial distance, and in which pushed in a third step, the processed bearing set on the rotor shaft and finally connected with it.

moreover It is envisaged that in the first step, a one-piece measuring ring or a set of measuring disks in the cylindrical roller bearing instead of the cylindrical rollers between outer ring and inner ring is inserted (roller embossing ring), wherein the axial Width of the measure ring or the measuring disks corresponds to the axial width of the cylindrical rollers, after which the bearing set is pushed onto the vertically arranged rotor shaft and that in the third step the processed bearing set with provided the cylindrical rollers and pushed onto the rotor shaft and with this final is connected.

One this method offers very significant advantages over the previously known methods. So far, the assembly of the bearing set in two steps. In the first step, then the first Axial play measured in the bearing set and the matching shim to Axial play adjustment selected. In the second step, the gap between Rotor and housing. The unit is reassembled, then the gap between Rotor and housing measured to subsequently disassemble the unit again and the correct shim to Use shaft adjustment.

By the measure ring or by a corresponding set of measuring disks can be on surprising simple way an insurmountable obstacle the previously used method, namely a recurrent Measurement error, which therefore stems that radially unloaded but axially excessively heavily loaded cylindrical rollers tilt around its axis. This tilting leads to a measurement error, the so far only estimated but not cleared out could be.

In addition, can be provided in a development of the method according to the invention that in the second step, at least one measured axial supernatant a front edge opposite a radially spaced end edge of the outer ring or inner ring of Cylindrical roller bearing is reduced.

In a particularly practical development of the method according to the invention It is envisaged that in the second step, the with the Borden provided End edges of outer ring and inner ring on a flat surface placed and the axially opposite End edges for removing the supernatant be sanded in one operation.

Especially Also advantageous is an embodiment of the method according to the invention, characterized by the fact that in the second step at least a supernatant of the inner ring of the cylindrical roller bearing with a deviation from +/- 0.001 mm to 0.008 mm, preferably of +/- 0.005 mm, compared to The result obtained in the first step is removed.

Especially Finally, it is advantageous an embodiment of the method according to the invention, characterized by characterized in that in the second step supernatants of front edges of the outer ring and inner ring of the ball bearing can be reduced.

Brief description of the drawings

The The invention will be explained in more detail below with reference to the accompanying drawings. In this shows

1 a radial section through an embodiment of a bearing set according to the invention in half view,

2 a longitudinal sectional view through a screw compressor with a bearing set according to the invention,

3 a method step of a method according to the invention with reference to a radial section through an embodiment of a bearing set according to the invention in half view,

4 a further method step of a method according to the invention with reference to a radial section through an embodiment of a bearing set according to the invention in half view,

5 a detail from 4 , and

Detailed description the drawing

In 1 is an embodiment of a bearing set according to the invention 1 shown in radial section in half view. The bearing set 1 consists of a thrust ball bearing 2 and from a radial force receiving cylindrical roller bearing 3 , When installed on a shaft of a rotor is the ball bearing 2 axially outside and the cylindrical roller bearing 3 arranged axially inside.

The ball bearing 2 is as an angular contact ball bearing 4 formed and has an outer ring 5 as well as an inner ring 6 on, between which bearing balls are arranged, of which in 1 only a ball bearing 7 is shown. The bearing balls 7 are in a camp cage 8th held and roll in careers, which of radial shoulders 9 respectively. 10 are limited. Axially inner faces 11 . 12 from outer ring 5 and inner ring 6 are in the fate of a radial gap 13 against the cylindrical roller bearing 3 directed. Although for the bearing set according to the invention 1 an angular contact ball bearing 4 is preferred, it is also within the scope of the invention to use instead a four-point bearing or a deep groove ball bearing.

The cylindrical roller bearing 3 has an outer ring 14 and an inner ring 15 on, between which cylindrical rollers 16 is arranged, of which in 1 only a cylindrical roller 16 is shown. The cylindrical rollers 16 are in a camp cage 17 held. An outer career 18 of the outer ring 14 is axially inside of a conical extension, an insertion bevel 19 , and axially outwardly from a radially inwardly projecting axially outboard board 20 limited. The inner ring 15 is a mirror image of the outer ring 14 built up. Corresponding is an inner raceway 21 axially outside of a conical extension, an insertion bevel 22 , and axially inwardly from a radially inwardly projecting board 23 limited. In the illustrated embodiment, the cylindrical roller is located 16 on board 20 of the outer ring 14 on, while the cylindrical roller 16 an axial distance 24 to the board 23 having. The conical extensions 19 and 22 facilitate the insertion of the set of cylindrical rollers 16 in the cylindrical roller bearing 3 ,

Axially outer end edges 25 . 26 from outer ring 14 and inner ring 15 lie on the axially outer faces 11 . 12 of angular contact ball bearing 4 at. The axially inner end edges 27 and 28 from outer ring 14 and inner ring 15 of the cylindrical roller bearing 3 are aligned parallel to each other, as well as the axially outer end edges 29 and 30 from outer ring 5 and inner ring 6 of angular contact ball bearing 4 ,

The in 1 illustrated bearing set 1 is the end result of the method according to the invention, which in relation to the 2 to 6 is explained in more detail.

In 2 is a longitudinal section of the partial view of a screw compressor 31 with two intermeshing rotors 32 . 33 shown in a housing 34 of the screw compressor 31 with two intersecting paraxial holes to form one of the rotors 32 . 33 receiving working space 35 are stored, the front side of a housing end wall 36 of the compressor housing 34 is completed.

The rotor 32 is as a rib rotor or main rotor and the rotor 33 is designed as Nutenrotor or Nebenläufer. An axial gap 37 between housing end wall 36 and the end walls of the rotors 32 . 33 must be set correctly to ensure proper operation of the screw compressor 31 to enable. rotor shafts 38 . 39 the rotors 32 . 33 ends axially outside the working space 35 and are each in bearing sets 1 stored, with the front edges 28 the inner rings 15 the cylindrical roller bearing 3 each at a start-up 40 the rotor shafts 38 . 39 issue.

The width of said axial gap 37 is determined by the housing dimensions of the screw compressor 31 as well as significantly from a projection of the cylindrical roller bearing to be described in more detail 3 of the bearing set 1 affected. A narrowing of the respective parameters, in particular the protrusions of the cylindrical roller bearing 3 , leads to a more accurate pre-setting of the gap 37 during the assembly process.

The in 2 shown state corresponds to a widely known assembly method in which the screw compressor 31 is vertically aligned. The rotors 32 . 33 be doing so with an only indicated force generating device 41 for the application of a tensile force, for example in the amount of about 300 N connected. A likewise only hinted measuring instrument 42 measures a displacement of the outer rings 5 . 14 opposite the inner rings 6 . 15 of ball bearings 2 and cylindrical roller bearings 3 ,

For a better understanding of the previous problem of the prior art, the bearing set 1 the rotor shaft 39 of the rotor 33 with the cylindrical rollers 16 stocked. Due to the relatively high vertical force, which corresponds to an abnormally high axial load during operation, and due to the lack of radial load in this mounting structure, the cylindrical rollers tilt 16 around its axis. This tilting of the cylindrical rollers 16 causes a measurement error, as the shaft can thereby move axially further than would be possible without tilting, which consequently leads to a wrong calculation of the necessary distance of the bearing set 1 to the startup association 40 leads.

To avoid this measurement error from the outset, the bearing set 1 the rotor shaft 38 mounted in deviation from the previously known. This is done in place of the cylindrical rollers 16 a one-piece measure ring 43 in the cylindrical roller bearing 3 used. Because of the cylindrical roller bearing 3 only one board each 20 . 23 on the inner ring 14 or outer ring 15 it is possible, the cylindrical roller bearing 3 to dismantle and the cylindrical rollers 16 through the custom ring 43 to replace. The custom ring 43 has an axial width which corresponds to the axial width of the cylindrical rollers 16 equivalent. It is also possible, instead of the one-piece measure ring 43 to use a set of measuring disks whose total thickness is also the axial width of the cylindrical rollers 16 equivalent. It is important that a gauge is used that is inside the cylindrical roller bearing 3 do not tilt and thus can not falsify the measurement result.

After the axial distance of the bearing set 1 to the startup association 40 or the axial distances of the end edges of the inner rings 6 . 15 are measured to each other, the bearing set 1 from the screw compressor 31 removed and sent for further processing. Finally, the gap 37 between the rotors 32 . 33 and the housing end wall 36 adjusted by means of a passport disk, in this final assembly process instead of the measure ring 43 the cylindrical rollers 16 to be built in.

In the 3 to 6 are individual intermediate stages during assembly and subsequent processing of a bearing set 1 shown. In 3 is the beginning of winding up the bearing set 1 on the in 3 not shown rotor shaft 38 or 39 shown. In particular, the beginning of the shifting of the still excessive outer ring can be seen 14 of the cylindrical roller bearing 3 opposite the inner ring 15 of the cylindrical roller bearing. This results in an axial offset or protrusion 44 the axially outer end edge 26 of the inner ring 15 opposite the axially outer end edge 25 of the outer ring 14 of the cylindrical roller bearing 3 , as well as an axial offset or protrusion 45 the axially inner end edge 27 of the outer ring 14 opposite the axially inner end edge 28 of the inner ring 15 of the cylindrical roller bearing 3 ,

In 4 another condition is shown in which the angular contact ball bearings 4 and the cylindrical roller bearing 3 abut each other and a tensile force of about 300 N on the now vertically aligned rotor shaft 38 or 39 is applied. This causes a displacement of the outer rings 5 . 14 opposite the inner rings 6 . 15 , The axial distances of the front edges 11 . 12 . 29 . 30 of angular contact ball bearing 4 and the axial distances of the end edges 25 to 28 of the cylindrical roller bearing 3 to each other are now measured. Subsequently, the screw compressor 31 dismantled and the bearing set 1 is from the corresponding rotor shaft 28 or 29 deducted.

5 shows the cylindrical roller bearing 4 after disassembly. It can be seen in particular that the supernatant 44 wider than the supernatant 45 , The next step is the custom ring 43 removed, and in a simple manner, that the outer ring 14 is deducted, which by its design with only one axially outer board 20 is possible.

In a next process step, the two rings 14 . 15 ground to the desired width. In a final step, the custom-finished cylindrical roller bearing will be finished 3 reassembled, with the cylindrical rollers 16 fitted and to the bearing set 1 according to 1 completed.

It is also possible the inner ring 15 of the cylindrical roller bearing 3 so that there is still a tolerance to the measured value. By this is meant, for example, 0.001 to 0.008 mm, preferably 0.005 mm, less or more material from the front edge 28 of the inner ring 15 is removed when the measurement has yielded. This leaves a certain safety margin against the measured value, resulting in re-mounting the bearing set 1 on a rotor shaft 28 respectively. 29 Let settling or the like compensate. Furthermore, this also makes it possible to dispense with otherwise usual shims or fittings.

The ball bearing 2 can be processed analogously to the previously described steps, especially if an angular contact ball bearing 4 as a ball bearing 2 of the bearing set 1 is used. Accordingly, the resulting projections of the end edges 11 . 12 and 29 . 30 measured in the manner described above and removed by grinding.

The bearing set according to the invention 1 which is from the ball bearing 2 and the cylindrical roller bearing 3 which is virtually an abnormal NJ cylindrical roller bearing is not only suitable for supporting the rotor shafts described above 38 . 39 but also for applications in which an axial close guidance of the shaft is necessary, in which there is a directional axial main load direction in operation, and which can occur in a temporally small proportion to the occurrence of a back pressure force. Ideally, the ratio between the axial back pressure force and the radial load is less than or equal to 0.4.

1

bearings

2

ball-bearing

3

Cylindrical roller bearings

4

Angular contact ball bearings

5

outer ring

6

inner ring

7

bearing ball

8th

bearing cage

9

shoulder

10

shoulder

11

face

12

face

13

gap

14

outer ring

15

inner ring

16

cylindrical roller

17

bearing cage

18

Outer race

19

conical Extension, import slope

20

shelf

21

Inner raceway

22

conical Extension, import slope

23

shelf

24

distance

25

front edge

26

front edge

27

front edge

28

front edge

29

front edge

30

front edge

31

screw compressors

32

rotor

33

rotor

34

casing

35

working space

36

Housing end wall

37

gap

38

rotor shaft

39

rotor shaft

40

stop collar

41

Power generator

42

gauge

43

sizing ring

44

Got over

45

Got over

Claims (11)

Bearing set ( 1 ) of a roller bearing in a housing ( 34 ) with front play ( 37 ) mounted rotor ( 32 ; 33 ), for example, a screw compressor ( 31 ), the bearing set ( 1 ) from an axially outer ball bearing ( 2 ; 4 ) and from an axially inwardly disposed cylindrical roller bearing ( 3 ) whose inner rings ( 6 . 15 ) in the installed state rotationally fixed on a rotor shaft ( 38 ; 39 ), characterized in that the cylindrical roller bearing ( 3 ) is designed dismantled and an outer ring ( 14 ) with a single axially outer board ( 20 ) and an inner ring ( 15 ) with a single axially inner board ( 23 ), wherein the between inner ring ( 15 ) and outer ring ( 14 ) arranged set of cylindrical rollers ( 16 ) axially from the ribs ( 20 . 23 ) of outer ring ( 14 ) and inner ring ( 15 ) is limited. Bearing set according to claim 1, characterized in that an outer raceway ( 18 ) of the outer ring ( 14 ) axially inward of a conical extension ( 19 ) and axially outwardly of the radially inwardly projecting axially outboard board ( 20 ) and that the inner ring ( 15 ) an inner raceway ( 21 ), which axially outward of a conical enlargement ( 22 ) and axially inwardly from a radially inwardly projecting board ( 23 ) is limited. Bearing set according to claim 1 or 2, characterized in that the cylindrical rollers ( 16 ) an axial distance ( 24 ) to at least one board ( 20 ; 23 ) exhibit. Bearing set according to at least one of claims 1 to 3, characterized in that the ball bearing ( 2 ) is a four-point bearing or a deep groove ball bearing. Bearing set at least according to claim 1, characterized in that the ball bearing ( 2 ) an angular contact ball bearing ( 4 ), which has an outer ring ( 5 ) with one shoulder ( 9 ) and an inner ring ( 6 ) with one shoulder ( 10 ), the shoulders ( 9 . 10 ) are axially spaced from each other and bearing balls ( 7 ) axially limit. Bearing set according to claim 5, characterized in that the angular contact ball bearing ( 4 ) is designed dismantled. Method for mounting a bearing set on the rotor shaft ( 38 ; 39 ), for example, a screw compressor ( 31 ), in which, in a first step, the ball bearing ( 2 ; 4 ) and cylindrical roller bearings ( 3 ) existing bearing set ( 1 ) on the vertically arranged rotor shaft ( 38 ; 39 ) and the rotor shaft ( 38 ; 39 ) is loaded with a vertical force and an axial distance ( 37 ) of the rotor ( 32 ; 33 ) to the housing end wall ( 36 ) and the distance between at least the inner rings ( 6 . 15 ) of the bearing set ( 1 ) to a contact surface ( 40 ) of the rotor shaft ( 38 ; 39 ) and in a second step the bearing set ( 1 ) from the rotor shaft ( 38 ; 39 ) and after dismantling the bearing set ( 1 ) this is processed to correct the axial distance, and in which in a third step the processed bearing set ( 1 ) on the rotor shaft ( 38 ; 39 ) is pushed and finally connected to this, characterized in that in the first step, a one-piece measuring ring ( 43 ) or a set of washers into the cylindrical roller bearing ( 3 ) instead of the cylindrical rollers ( 16 ) between outer ring ( 14 ) and inner ring ( 15 ), wherein the axial width of the Maßrings ( 43 ) or the measuring disks of the axial width of the cylindrical rollers ( 16 ), according to which the bearing set ( 1 ) on the vertically arranged rotor shaft ( 38 ; 39 ) and in the third step the processed bearing set ( 1 ) with the cylindrical rollers ( 16 ) and on the rotor shaft ( 38 ; 39 ) is postponed and finally connected with this. Method according to claim 7, characterized in that in the second step at least one measured axial supernatant ( 44 ; 45 ) of a front edge ( 26 ; 27 ) with respect to a radially spaced end edge ( 25 ; 28 ) of outer ring ( 14 ) or inner ring ( 15 ) of the cylindrical roller bearing ( 3 ) is reduced. Method according to at least one of claims 7 to 8, characterized in that in the second step, the with the Borden ( 20 . 23 ) provided front edges ( 25 . 28 ) of outer ring ( 14 ) and inner ring ( 15 ) are placed on a flat surface and the axially opposite end edges ( 26 ; 27 ) for ablation of the supernatant ( 44 . 45 ) are sanded in one operation. Method according to at least one of claims 7 to 9, characterized in that in the second step at least one supernatant ( 44 ; 45 ) of the inner ring ( 15 ) of the cylindrical roller bearing ( 3 ) with a deviation of +/- 0.001 mm to 0.008 mm, preferably of +/- 0.005 mm, compared with the measurement result obtained in the first step. Method according to at least one of claims 7 to 10, characterized in that in the second step supernatants of end edges ( 11 . 12 ; 29 . 30 ) of outer ring ( 5 ) and inner ring ( 6 ) of the ball bearing ( 2 ; 4 ) be reduced.