DE10119889A1 - Roller bearing, especially cylindrical roller bearing has cage with ring-shaped section located outside axial roller body area when fitted - Google Patents

Abstract

The bearing has a cage (5,5') of mainly flat ring shape with pockets for roller bodies (4). The cage has at least one ring-shaped section (7,7'), which with assembled roller bearing is located within an axial area (B7), which is outside the axial area (B4) of the roller bodies. The cage also has pocket sections (8,8'), each connected to a ring-shaped section, and located within an axial area (B8), which is inside the axial area of the roller bodies.

Description

The invention relates to a rolling bearing, in particular a cylindrical roller bearing of an outer ring and an inner ring, with at least one of the rings has at least one radially extending rim, a plurality of between Outer ring and inner ring arranged rolling elements with a length that extends over extend an eel area, and at least one cage with an in essentially flat, annular base contour, one of the number of rolling elements has a corresponding number of receiving pockets.

Rolling bearings, in particular cylindrical roller bearings, of the generic type are known. Disc cages are sometimes used to guide the cylindrical rollers used. These have an essentially flat, ring-shaped base contour. Corresponding bearings with disc cages are for example from DE 42 44 091 A1 and DE 197 36 374 A1.

The use of disc cages has proven itself in cylindrical roller bearings. Indeed cages of this type have the disadvantage that their assembly can sometimes be very difficult is and can only be accomplished with special measures. The Disk cage is usually in a groove in the track of the interior or Outer ring guided. Therefore, the cage must be strong when it is installed Undergo deformation so that it can be inserted into the groove. alternative  it has also become known, the outer ring of the camp in an eel cut, in which the groove is to blow up, insert the disc cage into the groove and then reassemble the outer ring.

All of this not only significantly increases the assembly effort of the cage, cage or rings are also subject to significant weakening.

The invention is therefore based on the object of a roller bearing, in particular a cylindrical roller bearing of the generic type in such a way that it it is possible to use a ring-like cage without the previously known in the Technology to accept known disadvantages. In particular, it should be possible to insert the disc cage into the raceways without inserting a groove To be able to guide inner or outer ring. This is supposed to be the bearing capacity of the bearing increase. Furthermore, it should be possible in a particularly simple manner the cage and thus to be able to assemble the entire warehouse.

The solution to this problem by the invention is in a cage with a essential flat, annular base contour characterized in that the Cage has at least one annular section, which in the assembled state of the rolling bearing is arranged in an axial area outside of the axial Area of the rolling elements, and that the cage has a number of Has pocket sections, each with the at least one annular Section are connected and which are arranged in an axial region, the is within the axial range of the rolling elements.

With this configuration, it becomes possible to have a disc-shaped or ring-shaped cage for guiding the cylindrical rollers in a cylindrical roller bearing that does not Groove required in the inner or outer ring of the bearing. The leadership of the individual Cylindrical rollers are made with pocket sections that are in the axial area of the Pass in cylindrical rollers. The individual pocket sections are, however, with one  annular portion of the cage connected, which is outside the axial area the cylindrical rollers are located.

According to a first further development it is provided that on the annular section further pocket sections extending into the axial region of the rolling elements are arranged. With regard to the guidance of the cage, it can be provided that alternatively the cage by placing the pocket sections on the rolling elements that the Cage by radial contact of the pocket sections with the track of the outside or Inner ring or that the cage by radial contact of the annular portion the radially extending rim of the outer or inner ring is guided.

A particularly stable guidance results when two of the cages described a cylindrical roller bearing can be used, the two cages then are preferably located in the axial end region of the rolling elements.

The cage in question can also be divided at a peripheral point and be connected again. In particular, it can be provided that the annular portion of the cage at at least one circumferential location Has an interruption. It can then be provided for secure assembly of the cage be that means of positive connection at the point of interruption the two ends of the annular portion are arranged. The Interruption can also be permanently closed after the cage has been installed be, e.g. B. by welding or gluing.

If two cages are provided, it can still be considered that the two cages arranged in relation to each other in relation to their relative circumferential position are that their interruptions are essentially diametrically opposed.

A particularly simple way of assembling the described cage results if it is provided that the annular portion of the cage along the Has a circumferential wavy contour. The annular section  of the cage can then in particular be designed to be elastic in order to Assemble the cage by elastic changing the waveform's diameter to reduce the radially outer ends of the pocket sections and these over the Lead on the ring. An assembly tool can be used for this, its claws engage in the undulating section.

However, the assembly of the cage described can be done in another way be relieved. Hereafter it is provided that two diametrically opposite radially outer portions of the cage have a diameter reduction such that the radially outer ends of the pocket sections are opposite to them Nominal diameter are reduced. In addition, it can be provided that two further diametrically opposite outer sections of the cage one Have diameter reduction such that the radially outer ends of the Pocket sections are reduced compared to their nominal diameter, the Sections and the other sections related to the center of the cage are arranged perpendicular to each other.

The pocket sections for forming the receiving pockets for the rolling elements can made of two sections of different material arranged side by side exist, in particular on materials with different dimensional stability and Hardness is thought. In particular, the one plastic material with a low Content of glass fibers and the other material plastic with a higher content Be glass fibers. The annular sections, however, preferably consist of elastic material.

The functionality of the cage can be improved in that the annular section at least one sealing element, preferably by injection molding is attached to the section.

Furthermore, there is an improvement in the running time of the bearing if at least one annular section of the cage with a reinforcing element, in particular  high-strength material. This reinforcing element can be a steel ring his. Alternatively, it can also be provided that there is a ring element is substantially rectangular in cross section. The connection between annular section and reinforcing element is preferably by means of a clip Connected. The reinforcing element can in the axial side area or arranged in the radially inner or outer region of the annular section his.

In the drawing, embodiments of the rolling bearing with the shown cage according to the invention. Show it:

Fig. 1 shows schematically a radial section through a cylindrical roller bearing,

Fig. 2 shows the detail of the side view of the cut in the middle of the bearing,

Fig. 3 shows an alternative to Fig. 1 embodiment,

FIG. 4a through FIG. 4c is a side view of the cage in the region of a point of interruption,

Fig. 5 shows the detail of the side view of the retainer according to an alternative embodiment,

Fig. 6 is a to Fig. 5 analog representation, however, during the assembly of the cage

Fig. 7 is a side view of the cage with diameter reductions for the purpose of simplified mounting possibility,

Fig. 8 shows diagrammatically a possibility of the assembly operation of the cage,

Fig. 9 shows a cage with an integrated seal and

Fig. 10 to Fig. 15, the cage with differently designed reinforcing elements.

In Fig. 1, a cylindrical roller bearing 1 can be seen in section. This has an outer ring 2 , which is equipped with two radially extending ribs 10 . The cylindrical rollers 4 are arranged between the outer ring 2 and the inner ring 3 . To guide them, two cages 5 and 5 'are provided, each of which is positioned in the eel end region of the rolling elements 4 .

The cages 5 , 5 'each have an annular section 7 or 7 '. In the assembled state of the bearing, these annular sections 7 , 7 ′ are located in an axial region B ₇ , which is outside the axial region B ₄ , which is defined by the axial extent of the rolling elements 4 (length L of the rolling elements). Pocket sections 8 , 8 ', which are arranged in the axial region B ₈ , which is located within the axial region B _{4 of} the rolling bodies, are connected to the annular section 7 , 7 '.

As can be seen from the illustration according to FIG. 2, the pocket sections 8 and 8 ′ define receiving pockets 6 for receiving and guiding the rolling bodies 4 .

The overall result is a structure which is characterized by the annular sections 7 and 7 ', from which pocket sections 8 and 8 ' extend into the axial region B _{4 of} the rolling elements. This eliminates the need for guide grooves for the generally flat, ring-shaped cage in the outer and inner raceways of the bearing.

For improved guidance, additional pocket sections 9 and 9 'can also be provided, which are connected to the annular section 7 , 7 ' and - like the pocket sections 8 , 8 '- extend into the axial region B _{4 of} the rolling elements.

While FIGS . 1 and 2 show the typical embodiment for a sheet metal cage, FIG. 3 shows how the geometric configuration usually looks in the case of a plastic cage.

Since the pocket sections 8 and 8 'for mounting the cage generally have to be reduced in diameter, the cage 5 , 5 ' can be interrupted at a circumferential point. Corresponding configurations can be seen in FIGS. 4a to 4c. The interruption is identified by the reference number 11 , but means 12 for the form-fitting connection of the two ends of the annular section can be provided at the two opposite end points of the annular section 7 . A simple clip is provided for this in FIG. 4a, while a sawtooth-shaped profile is arranged in FIG. 4b. In the solution according to FIG. 4c, means for positive connection are dispensed with; here the two ends lie next to one another at the interruption point 11 in the assembled state without further measures.

However, the cage 5 , 5 'can also be assembled without an interruption point 11 according to FIGS. 4a to 4c being provided. For this purpose, reference is made to FIGS. 5 and 6. The ring-shaped section 7 runs here in a wave shape over the circumference. In Fig. 5 the cage geometry can be seen as it results in the assembled state. Fig. 6 shows the constellation as it arises during the assembly process. For this purpose, an assembly tool with a plurality of radially displaceable claws can be used, which pull the cage together radially. The dash-dotted circle indicates which minimum diameter of the rim 10 must be overcome before the cage can be brought into position. For this purpose, the cage is radially compressed on all sides with the tool, the undulating section 7 deforming accordingly (see comparison of FIGS. 5 and 6). After the cage deformed in this way has been introduced into the desired end region, it springs back into the position outlined in FIG. 5 and is fixed behind the shelf.

With a sufficient axial length of the cage, the assembly process can also be carried out without radial deformation by entanglement of the cage during assembly, as can be seen from FIG. 7. The pocket sections 8 here have sections 13 and 14 of reduced diameter in two regions which are each arranged perpendicular to one another. This means that this area of the pocket sections is reduced compared to the actual nominal diameter. By pivoting the cage 5 into the outer ring 2 , assembly is possible without the cage having to be deformed in any way.

The assembly of the cage described can be done in different ways; Various measures that facilitate this have already been described above. One possibility of assembly is that the cage is pressed oval and is pushed over the rim 10 of the bearing ring in this way.

An alternative procedure is outlined in FIG. 8. The pocket sections 8 and 8 'are formed here from two partial sections 20 and 21 arranged next to one another. The section 20 is made of plastic with a high content of glass fibers. This section is therefore wear-resistant and dimensionally stable. Meanwhile, the adjacent portion 21 is formed of plastic with little or no glass fiber content. This section is therefore flexible. This flexibility can improve the mountability. As can be seen in FIG. 8, the cage can be compressed over the entire circumference by means of a tool shown with a bevel on the right, so that the sections 20 and 21 turn over to the side (see right area of FIG. 8, in which the tool is shown). The cage is then pushed to the left over the rim 10 of the bearing ring 2 until it reaches its end position. The cage shown on the left is just before its end position.

In FIG. 9 it can be seen that a sealing element 22 can be arranged on the ring-shaped section 7 or 7 'of the cage, which runs against the inner ring 3 and thus seals the bearing. In particular, it can be provided that the annular section 7 or 7 ′ and the sealing element 22 are formed in situ by a common injection molding process.

The dimensional stability of the cage according to the invention is of considerable importance. For this reason, the cages, which are partially only schematically sketched in FIGS. 10 to 15, are provided with reinforcing elements which increase the stability.

In FIG. 10 it can be seen that the annular section 7 or 7 'is provided with a circular recess into which a reinforcing element 23 in the form of a steel ring is clipped. The steel ring can be closed or have an interruption point, which can be important for the assembly of the cage. While in FIG. 10 the steel ring is arranged in the lateral area of the annular section 7 , 7 ', it can be seen from FIG. 11 that it can also be placed in the radially inner area of the section 7 , 7 '. It is not shown that the steel ring can also be positioned in the radially outer region of the section 7 , 7 '.

In FIG. 12 it can be seen that the reinforcing element 23 can consist of an annular disk arranged laterally on the annular section 7 , 7 ', which is connected to the section 7 , 7 ' via a tongue and groove connection. In addition, it can be provided that the reinforcing element 23 is glued or welded to the section 7 , 7 '.

A corresponding illustration can be seen in FIG. 13, but here a positive connection between section 7 , 7 'and reinforcing element 23 is provided, which has an undercut and thus ensures an improved hold of the two parts 7 , 7 ' and 23 .

An embodiment similar to FIG. 13 is sketched in FIG. 14. Here, however, the reinforcing element 23 is designed as a radially positioned ring for the annular section 7 , 7 ', which is securely arranged there with a snap connection on the section 7 , 7 '. To assemble such a configuration, either the reinforcing element 23 and / or the annular section 7 , 7 'must have an interruption point 11 (see FIG. 4).

Finally, FIG. 15 shows how the reinforcing element 23 — here in the form of a ring with a rectangular cross section — is clipped into a recess in the annular section 7 , 7 ′. In this way, too, a high stability of the annular section 7 , 7 'can be achieved.

Although the invention was illustrated using the example of a cylindrical roller bearing, it is generally suitable for roller bearings (roller bearings), in which essentially elongated rolling elements are used. By name is next to Cylindrical roller bearings are also intended for barrel roller bearings, tapered roller bearings and needle roller bearings.  

LIST OF REFERENCE NUMBERS

1

Cylindrical roller bearings

2

outer ring

3

inner ring

4

rolling elements

5

.

5

' Cage

6

receiving pockets

7

.

7

'' annular section

8th

.

8th

'' Pocket sections

9

.

9

'' Pocket sections

10

shelf

11

interruption

12

Means for positive connection

13

reduced diameter sections

14

further reduced-diameter sections

20

first section

21

second part

22

sealing element

23

reinforcing element
L length of the rolling element

4

B ₄

axial area of the rolling element
B ₇

axial area of the annular portion

7

B ₈

axial area of the pocket sections

Claims (26)

1. Rolling bearings, in particular cylindrical roller bearings ( 1 ), consisting of
an outer ring ( 2 ) and an inner ring ( 3 ), at least one of the rings ( 2 , 3 ) having at least one radially extending rim ( 10 ),
a plurality of rolling elements ( 4 ) with a length (L) which are arranged between the outer ring ( 2 ) and inner ring ( 3 ) and which extend over an axial region (B ₄ ), and
at least one cage ( 5 , 5 ') with an essentially flat, ring-shaped base contour, which has a number of receiving pockets ( 6 ) corresponding to the number of rolling elements ( 4 ),
characterized in that
the cage ( 5 , 5 ') has at least one annular section ( 7 , 7 ') which, in the assembled state of the roller bearing ( 1 ), is arranged in an axial region (B ₇ ) which is outside the axial region (B ₄ ) of the Rolling element ( 4 ) lies, and that
the cage ( 5 , 5 ') has a number of pocket sections ( 8 , 8 ') which are each connected to the at least one annular section ( 7 , 7 ') and which are arranged in an axial region (B ₈ ) which lies within the basking area (B ₄ ) of the rolling elements ( 4 ). 2. Rolling bearing according to claim 1, characterized in that on the annular section ( 7 , 7 ') in the axial region (B ₄ ) of the rolling elements ( 4 ) extending further pocket sections ( 9 , 9 ') are arranged. 3. Rolling bearing according to claim 1 or 2, characterized in that the cage ( 5 , 5 ') is guided by the pocket portions ( 8 , 8 ', 9 , 9 ') on the rolling elements ( 4 ). 4. Rolling bearing according to claim 1 or 2, characterized in that the cage ( 5 , 5 ') by radial contact of the pocket portions ( 8 , 8 ', 9 , 9 ') to the raceway of the outer ( 2 ) or inner ring ( 3rd ) to be led. 5. Rolling bearing according to claim 1 or 2, characterized in that the cage ( 5 , 5 ') by radial contact of the annular portion ( 7 , 7 ') on the radially extending rim ( 10 ) of the outer ( 2 ) or inner ring ( 3 ) is performed. 6. Rolling bearing according to one of claims 1 to 5, characterized by two cages ( 5 , 5 '). 7. Rolling bearing according to claim 6, characterized in that the two cages ( 5 , 5 ') are each arranged in the axial end region of the rolling elements ( 4 ). 8. Rolling bearing according to one of claims 1 to 7, characterized in that the radial end region of the flange ( 10 ) is ground. 9. Rolling bearing according to one of claims 1 to 8, characterized in that the annular portion ( 7 , 7 ') of the cage ( 5 , 5 ') has an interruption ( 11 ) at at least one peripheral point. 10. Rolling bearing according to claim 9, characterized in that means ( 12 ) for positively connecting the two ends of the annular section ( 7 , 7 ') are arranged at the point of the interruption ( 11 ). 11. Rolling bearing according to claim 9 or 10, as far as referred back to claim 6, characterized in that the two cages ( 5 , 5 ') are arranged with respect to their relative circumferential position so that the interruptions ( 11 ) are substantially diametrically opposite , 12. Rolling bearing according to one of claims 1 to 11, characterized in that the annular section ( 7 , 7 ') of the cage ( 5 , 5 ') has a wavy contour along the circumference. 13. Rolling bearing according to claim 12, characterized in that the annular portion ( 7 , 7 ') of the cage ( 5 , 5 ') is designed to be elastic in order to assemble the cage ( 5 , 5 ') by changing the waveform Reduce the diameter of the radially outer ends of the pocket sections ( 8 , 8 '). 14. Rolling bearing according to one of claims 1 to 13, characterized in that two diametrically opposite radially outer portions ( 13 ) of the cage ( 5 , 5 ') have a diameter reduction such that the radially outer ends of the pocket portions ( 8 , 8 ') compared to their nominal diameter are reduced. 15. Rolling bearing according to claim 14, characterized in that two further diametrically opposite outer sections ( 14 ) of the cage ( 5 , 5 ') have a diameter reduction in such a way that the radially outer ends of the pocket sections ( 8 , 8 ') are reduced in relation to their nominal diameter , the sections ( 13 ) and the further sections ( 14 ) being arranged perpendicular to one another with respect to the center of the cage ( 5 , 5 '). 16. Rolling bearing according to one of claims 1 to 15, characterized in that the cage ( 5 , 5 ') consists of sheet metal. 17. Rolling bearing according to one of claims 1 to 15, characterized in that the cage ( 5 , 5 ') consists of plastic. 18. Rolling bearing according to one of claims 1 to 17, characterized in that the pocket sections ( 8 , 8 ', 9 , 9 ') from at least two juxtaposed sections ( 20 , 21 ) made of different material, in particular at least two materials with different Dimensional stability and hardness. 19. Rolling bearing according to claim 18, characterized in that a material Plastic with a low content of glass fibers is and a material Plastic with a higher glass fiber content. 20. Rolling bearing according to one of claims 1 to 19, characterized in that the annular sections ( 7 , 7 ') consist of elastic material. 21. Rolling bearing according to one of claims 1 to 20, characterized in that on the annular section ( 7 , 7 ') at least one sealing element ( 22 ), preferably by joint injection molding with the section ( 7 , 7 ') is attached. 22. Rolling bearing according to one of claims 1 to 21, characterized in that at least one annular section ( 7 , 7 ') is connected to a reinforcing element ( 23 ), in particular made of high-strength material. 23. Rolling bearing according to claim 22, characterized in that the reinforcing element ( 23 ) is a steel ring. 24. Rolling bearing according to claim 22, characterized in that the reinforcing element ( 23 ) is a ring element with a substantially rectangular cross section. 25. Rolling bearing according to one of claims 22 to 24, characterized in that the connection between the annular section ( 7 , 7 ') and the reinforcing element ( 23 ) takes place by means of a clip connection. 26. Rolling bearing according to one of claims 23 to 25, characterized in that the reinforcing element ( 23 ) is arranged in the eel side region or in the radially inner or outer region of the annular section ( 7 , 7 ').