DE102015214851A1 - Cage for ball bearings - Google Patents

Abstract

The invention relates to a rolling bearing (1) with a bearing inner ring (2), a bearing outer ring (3), a bearing cage (4) and a plurality of rolling elements (5) which are guided in pockets (6) of the bearing cage (4) each circumferentially adjacent pocket (6) supports the axially opposite side of the respective rolling body (5), so that by two circumferentially successively arranged pockets (6) of the bearing cage (4) is guided axially, wherein the pockets (6) from two in each case Pocket halves (8, 9) are made and the pockets (6) are performed alternately in the circumferential direction different. According to the invention, the first pocket half (8) has a contour of a straight line (10) running obliquely to the axial center line (11) of the bearing cage (4).

Description

Field of the invention

The invention relates to a rolling bearing with a bearing inner ring, a bearing outer ring, a bearing cage and a plurality of rolling elements, which are guided in pockets of the bearing cage, wherein each circumferentially adjacent pocket supports the axially opposite side of the respective rolling element, so that by two in the circumferential direction one behind the other arranged pockets of the bearing cage is axially guided, wherein the pockets each consist of two pocket halves and the pockets are carried out in the circumferential direction alternately different.

Background of the invention

Conventional bearing cages have the same pocket play in all directions due to the shape of the cage pockets. Depending on the load condition, this can have a negative influence on the running, wear and friction behavior of the bearing cage due to the leading and trailing of the rolling elements. For this reason, the bearing cages, especially their pockets, have been further developed.

In the EP 2 019 930 B1 For example, discloses a rolling bearing with a cage for guiding the rolling elements in the form of balls, wherein the axial cage pocket air in a plurality of cage pockets a value in the range 0.07 mm to 0.17 mm and a radial cage pocket air in several cage pockets a value between 0, 30 mm and 0.60 mm. The cage pockets in this case have ellipsoidal inner surfaces, so that the axial cage pocket air corresponds to the difference between the diameter of the ellipsoid in the axial direction and the diameter of the Wälzkörperkugeln.

In the DE 71 25 804 U is a rolling body guided cage for ball bearings described which consists of two provided with recesses for receiving the rolling elements cage halves. The recesses are alternately formed differently within each cage half. Furthermore, the two halves of the cage are assembled so that each two differently shaped recesses form a cage pocket, and that of two adjacent rolling elements each comes to rest on another half of the cage.

Furthermore, according to DE 75 20 254 U discloses an axial play free single row ball bearing, wherein the balls are arranged in a cage whose pockets are alternately offset in the axial direction against each other.

In the US 4,473,260 discloses a rolling bearing with a bearing cage, wherein the bearing cage has slot-like pockets, whereby in comparison to the already mentioned prior art larger pocket air is achieved in the circumferential direction.

Object of the invention

Object of the present invention is therefore to disclose a further developed and improved rolling bearing with bearing cage, in which the running, wear and friction behavior is further improved compared to the prior art.

Description of the invention

To solve the object of the invention specified in claim 1 rolling bearing is proposed. Optional advantageous embodiments of the invention arise wholly or partly from the dependent claims.

The rolling bearing according to the invention comprises a bearing cage, in which the rolling elements are guided. The bearing cage has for this purpose a plurality of pockets, each pocket consists of two pocket halves. The pockets of the bearing cage are arranged in the circumferential direction one behind the other at the same distance from each other. Furthermore, the adjacent pockets are designed differently. This means that a differently designed pocket is arranged between two identically designed pockets. Different pockets are thus arranged alternately in the circumferential direction. For example, the alternating of the pockets can be achieved by alternately mirroring the pockets in the circumferential direction at the axial center line of the bearing cage. That is, each adjacent pocket is rotated 180 degrees.

The rolling bearing according to the invention is characterized in that the first pocket half has a contour of a line extending obliquely to the axial center line of the bearing cage. It is expedient if the oblique straight line and the axial center line of the bearing cage an angle in the range of 0 ° to 40 °, for example 10 ° to 30 °, in particular 20 ° include.

In the embodiment of the second pocket half, several variants are advantageous, wherein the following variants relate to a section centrally through the pocket in the axial direction of the bearing cage. This means that the cut lies in a plane in which the axis of rotation of the bearing cage also runs. According to a first variant, the contour of the second pocket half describes a straight line parallel to the first pocket half. The means that the second half of the bag also has a contour of a line extending obliquely to the axial center line of the bearing cage. The bag thus provides an oblique bore, which is inclined for example by 20 ° to the axial center line, is.

In a further variant, the second pocket half likewise has an obliquely extending straight line, wherein this has an angle of preferably 20 ° with the axial center line and does not run parallel to the contour of the first pocket half. Thus arises from two pocket halves a truncated cone shape.

In a further preferred variant, the second pocket half has a dome shape. The term calotte is understood to mean a curved part of the surface of a spherical segment. This means that the second pocket half has a spherical shape that is greater than or equal to the diameter of the rolling element.

Furthermore, an obliquely extending straight line preferably has a dome-shaped final contour in one end region. In this case, the first and / or the second pocket half can be designed in this way. End region is understood to be a small part of the oblique straight line. This means that the oblique straight line is still referred to as such and only at the outlet, here also referred to as the end region modified. Thus, the oblique straight line goes over into a dome-shaped final contour.

This can also be the case with the dome-shaped pocket half. This means that the calotte shape of the second pocket half has an oblique straight line end contour in one end region. Here, analogous to the previous embodiment, the dome shape continues to be referred to as such, since only the end region, that is to say a very small part of the pocket half contour, is modified. The dome shape thus merges into an obliquely extending straight line contour.

It is also expedient if the pockets lying one behind the other in the circumferential direction are axially offset from one another. This means that there is an axial offset, with the axial offset between two circumferentially successive pockets amounting to a maximum of 10% of the rolling element diameter. The axial offset refers only to radial bearings. In axial bearings, however, preferably the pockets are radially offset in the circumferential direction. Two consecutive pockets thus assume the axial and radial guidance of the rolling elements due to the shape of the pocket halves and due to the offset.

The game between pocket contour and rolling elements is referred to as pocket air. The pocket air in the circumferential direction should preferably be greater than or equal to or greater than the pocket air in the axial direction.

The alternate, sloping pockets are also available as a grease deposit and allow you to ensure a very good supply of lubricant.

The rolling bearing is preferably designed as a radial deep groove ball bearing or as an axial ball bearing. In this case, the rolling bearing can be formed one or more rows. It is also possible to replace angular contact ball bearings with the rolling bearing according to the invention. The rolling elements are preferably made of metal or ceramic. Furthermore, it is advantageous if the bearing cage made of metal or plastic.

Due to the special embodiments of the bearing cage, the running, wear and friction behavior of the bearing cage is improved, in particular in the circumferential direction. In addition, the tensile / compressive stress on the bearing cage is reduced and the suitability for high speeds improved.

Brief description of the invention

Further details, features, combinations of features and effects on the basis of the invention will become apparent from the following description of preferred, exemplary embodiments of the invention and from the drawings. These show in:

1 an exemplary embodiment of a rolling bearing according to the invention in sectional view,

2 the bearing cage with rolling elements 1 in sectional view,

3 a further embodiment of a bearing cage with two parallel pocket contours,

4 another embodiment of a bearing cage,

5 an enlarged partial section of the first half of the bag 4 .

6 an enlarged partial section of the second pocket half 4 ,

Detailed description of the drawings

In the 1 is an inventive rolling bearing 1 , here designed as a deep groove ball bearing, shown schematically in a sectional view. The rolling bearing 1 includes a bearing inner ring 2 , a bearing outer ring 3 one between the bearing rings 2 . 3 arranged bearing cage 4 and a variety in the camp cage 4 guided rolling elements 5 , The rolling elements 5 are designed as balls.

In the 2 is the camp cage 4 out 1 also shown in sectional view, wherein the section along the maximum extent of the rolling body leads. The camp cage 4 has a variety of pockets 6 on, which are arranged in the circumferential direction one behind the other at the same distance from each other. In every bag 6 is a rolling element 5 inserted, with the pockets 6 are larger than the rolling elements 5 so that in the circumferential direction 7 ' and in the axial direction 7 '' Air, also called pocket air 7 is designated, between pocket contour 6 and rolling elements 5 is available.

The bags 6 can be split into two halves 8th . 9 divide. The first half of the bag 8th has a contour of an obliquely radially inwardly extending straight line 10 on. The oblique straight line 10 closes with the axial centerline 11 of the bearing cage 4 an angle α with an amount of 20 °. The second half of the bag 9 however, has a dome shape 12 on, whose diameter is larger than the diameter of the rolling element 5 ,

Furthermore, the axial centerlines are 13 the bags 6 not on the axial centerline 11 of the bearing cage 4 but are slightly offset in the axial direction. This is called axial offset 14 designated.

Every second bag 6 is further at the axial centerline 11 of the bearing cage 4 mirrored so that two adjacent rolling elements 5 on the opposite side of each bag 6 issue. Thus, based on the orientation of the pocket halves 8th . 9 according to the 2 and the axial centerline 11 of the camp cage 4 , the oblique straight line 10 the first half of the bag 8th on the left side and at the neighboring bag 6 arranged on the right side. This alternating arrangement of the pocket halves 8th . 9 is over the entire storage cage 4 continued, leaving an alternating arrangement of the bags 6 arises.

In the 3 is another embodiment of a bearing cage 4 shown in sectional view. The difference from the embodiment 1 and 2 results from the fact that in this embodiment not only the first 8th but also the second half of the bag 9 a sloping straight line 15 having both straight lines 10 . 15 parallel to each other. The dashed lines indicate the adjacent pocket 6 at.

In the 4 to 6 is another exemplary embodiment of a bearing cage 4 shown. The 4 is different 2 in that the pocket halves 8th . 9 a modified end region 16 exhibit. That is, in the radial direction of the bearing cage 4 every pocket half 8th . 9 an end area 16 not having the contour of the respective pocket half 8th . 9 equivalent. The first half of the bag 8th has a sloping straight line 10 on, at the radially inner end region 16 of the bearing cage 4 as dome-shaped final contour 17 is trained. This means that the oblique straight line 10 dome 17 expires. This is in 5 shown enlarged.

The second half of the bag 9 however, has a dome shape 12 on, at the radially outer end region 16 of the bearing cage 4 who in 6 is shown enlarged, in a sloping straight line end contour 18 passes. That means the dome shape 12 also a modified end area 16 having.

LIST OF REFERENCE NUMBERS

1

 roller bearing

2

 Bearing inner ring

3

 Bearing outer ring

4

 bearing cage

5

 rolling elements

6

 bag

7

 pocket air

7 '

 Pocket air in the circumferential direction

7 ''

 Pocket air in the axial direction

8th

 first pocket half

9

 second half of the bag

10

 oblique straight line of the first half of the bag

11

 axial center line of the bearing cage

12

 dome shape

13

 axial centerline of a bag

14

 axial offset

15

 oblique straight line of the second half of the bag

16

 end

17

 dome-shaped final contour

18

 Geradenendkontur

α

 Angle between the axial center line of the bearing cage and an oblique ver

current

 Straight line of a pocket half

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2019930 B1 [0003]
• DE 7125804 U [0004]
• DE 7520254 U [0005]
• US 4473260 [0006]

Claims (11)

Roller bearing ( 1 ) with a bearing inner ring ( 2 ), a bearing outer ring ( 3 ), a bearing cage ( 4 ) and a plurality of rolling elements ( 5 ), which are in pockets ( 6 ) of the bearing cage ( 4 ), each circumferentially adjacent pocket (FIG. 6 ) the axially opposite side of the respective rolling element ( 5 ) is supported, so that by two circumferentially successively arranged pockets ( 6 ) the bearing cage ( 4 ) is axially guided, wherein the pockets ( 6 ) from two pocket halves ( 8th . 9 ) and the pockets ( 6 ) are executed alternately in the circumferential direction, characterized in that the first pocket half ( 8th ) a contour one to the axial center line ( 11 ) of the bearing cage ( 4 ) oblique straight line ( 10 ) having. Roller bearing ( 1 ) according to claim 1, characterized in that the oblique straight line ( 10 ) and the axial center line ( 11 ) of the bearing cage ( 4 ) include an angle (α) in the range of 0 ° to 40 °, in particular 20 °. Roller bearing ( 1 ) according to one of the preceding claims, characterized in that the second pocket half ( 9 ) a parallel line ( 15 ) to the first half of the bag ( 8th ) having. Roller bearing ( 1 ) according to one of the preceding claims, characterized in that an obliquely extending straight line ( 10 ) in an end region ( 16 ) a dome-shaped final contour ( 17 ) having. Roller bearing ( 1 ) according to claim 1 or 2, characterized in that the second pocket half ( 9 ) a dome shape ( 12 ) having. Roller bearing ( 1 ) according to claim 5, characterized in that the dome shape ( 12 ) of the second half of the bag ( 9 ) in an end region ( 16 ) an oblique straight line end contour ( 18 ) having. Roller bearing ( 1 ) according to one of the preceding claims, characterized in that the pockets ( 6 ) in the circumferential direction alternately at the axial center line ( 11 ) of the bearing cage ( 4 ) are mirrored. Roller bearing ( 1 ) according to one of the preceding claims, characterized in that the circumferentially one behind the other pockets ( 6 ) offset axially relative to each other ( 14 ) are. Roller bearing ( 1 ) according to claim 8, characterized in that the axial offset ( 14 ) between two circumferentially one behind the other pockets ( 6 ) to a maximum of 10% of the rolling element diameter. Roller bearing ( 1 ) according to one of the preceding claims, characterized in that the pocket air in the circumferential direction ( 7 ' ) greater than or equal to the pocket air ( 7 '' ) in the axial direction. Roller bearing ( 1 ) according to one of claims 1, 2, 4, 7 to 10, characterized in that the second pocket half ( 9 ) an oblique straight line ( 15 ) which are not parallel to the straight line ( 10 ) of the first half of the bag ( 8th ) runs.

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