DE102017110690A1 - Rolling bearing cage and method for producing and mounting a rolling bearing cage - Google Patents

Abstract

The invention relates to a roller bearing cage (2) with two identical, formed from Blechumformteilen ring elements (4, 6), each having a plurality of circumferentially distributed, by abutment surfaces (8, 10) spaced from each other rolling bearing pockets (12, 14), wherein the abutting abutment surfaces (8, 10) of the two ring elements (4, 6) are riveted by means of rivets formed in these rivet holes (16, 18). According to the invention it is provided that the rivets (90) are formed as hollow rivets with a tubular central portion (28) and at its two ends radially outwardly flanged edge portions (30, 32).

Description

The invention relates to a rolling bearing cage with two identical, formed from Blechumformteilen ring elements, each having a plurality of distributed over the circumference, spaced by abutment surfaces Wälzkörpertaschen, wherein the abutting contact surfaces of the two ring elements are riveted by means of rivets formed in these rivet holes. Moreover, the invention relates to a method for producing and mounting such a roller bearing cage.

Such sheet metal cages find multiple use, especially in deep groove ball bearings, in which the Wälzkörpertaschen then have the form of Kugelkalottentaschen. Such roller bearing cages are typically made of two identical ring elements, which are punched out of a sheet material and reshaped by a stamping process so that they form the rolling body pockets described and the contact surfaces with the rivet holes provided therein. The ring elements are then riveted together via the abutment surfaces, so that they form a cage, wherein the respectively associated rolling body pockets form a pocket enclosing the associated rolling element.

From the EP 2 791 523 B1 a ball bearing cage is known in which two ring-like cage halves can be assembled axially and connected together in various ways (eg rivet cages, flap cages and welding cages). In conventional rivet cages of the type mentioned, ordinary rivets with a solid rivet shank and a rivet head are used, in which a massive rivet head is in turn moun- ted during assembly at the free end. This undesirably increases in particular the rotating mass during operation of the bearing.

Against this background, the invention has the object, the rotating mass of riveted rolling bearing cages, especially ball bearing cages, without significantly reducing a major additional technical effort.

The solution of this task is product related with a rolling bearing cage achieved, having the features of the main claim. In the independent method claim, a manufacturing method provided for its production is defined. Advantageous developments are the dependent claims can be removed.

The invention is based on the finding that in the already optimized with respect to their weight, punched sheet-metal ring elements, a further reduction of the weight or its mass is only possible by changes to the rivets.

Accordingly, the invention relates to a roller bearing cage with two identical, formed from Blechumformteilen ring elements, each having a plurality of circumferentially spaced, by abutment surfaces spaced Wälzkörpertaschen, wherein the abutting contact surfaces of the two ring elements are riveted by rivets formed in these rivet holes.

To achieve the object, it is provided that the rivets are formed as hollow rivets with a tubular central portion and at its two ends radially outwardly flanged edge portions.

As a result, the rotating mass of the same is significantly reduced in the plurality of rivets associated with a cage. Another advantage is that a crimping requires less technical effort than an upsetting process.

• - Bereitstellen rohrförmiger Nietrohlinge;
• - Bördeln eines Randabschnittes der Nietrohlinge jeweils zu einem vorbereiteten Niet;
• - Einsetzen der vorbereiteten Niete in zugeordnete Nietbohrungen eines aneinander anliegenden Ringelementen-Paares;
• - Bördeln der anderen Randabschnitte der vorbereiteten Niete.

With the rivets formed as hollow rivets, a favorable process for the production and assembly of said roller bearing cage can be realized, which is characterized by the following steps:

• - Providing tubular rivet blanks;
• - Beading of an edge portion of the rivet blanks each to a prepared rivet;
• - Inserting the prepared rivet in associated rivet holes of a contiguous ring element pair;
• - Beading the other edge portions of the prepared rivets.

In particular, the last two process steps can optionally be carried out using suitable devices in one operation.

To provide the tubular rivet blanks according to the first of the above-mentioned method steps, it is provided according to an embodiment of the invention that a flat band section is cut off from a flat strip strand and formed into a tubular rivet blank.

Another method provides that in each case a tubular rivet blank is cut directly from a pipe string.

To simplify the flaring and facilitate and save further weight, it is also provided that in the Edge portions of the rivet blanks recesses are attached, as will be explained in more detail with reference to embodiments. In particular, in the production of rivet blanks made of flat band sections, these recesses can be attached to the flat band section even before forming in a tubular rivet blank.

The assembly of a rolling bearing using a rolling bearing cage according to the invention can be carried out in such a way that initially nestled bearing rings are filled with the rolling elements and they are evenly distributed over the bearing circumference, then that the two ring elements are attached to the bearing so that the rolling elements in the associated Bags are received, and that in further steps according to the method described above, the ring elements are riveted together.

• 1 einen Wälzlagerkäfig in einer perspektivischen Darstellung,
• 2 einen Schnitt durch den Wälzlagerkäfig gemäß 1 im Bereich der Anlageflächen, vor dem Zusammenfügen und Vernieten der Ringelemente,
• 3 eine Ansicht etwa gemäß der 2, nach dem Zusammenfügen und Einsetzen eines Nietes,
• 4 eine Ansicht ähnlich den 2 und 3 nach dem Vernieten,
• 5a - 5c, 6a - 6c, 7a - 7c, 8a - 8c unterschiedliche Ausgestaltungen der Niete, und
• 9 in einer perspektivischen Explosionsdarstellung ein Wälzlager mit erfindungsgemäßem Wälzlagerkäfig.

The invention will be further explained with reference to embodiments. For this purpose, the description is accompanied by a drawing. In this shows

• 1 a roller bearing cage in a perspective view,
• 2 a section through the rolling bearing cage according to 1 in the area of the contact surfaces, before the joining and riveting of the ring elements,
• 3 a view approximately according to the 2 after joining and inserting a rivet,
• 4 a view similar to the one 2 and 3 after riveting,
• 5a - 5c . 6a - 6c . 7a - 7c . 8a - 8c different embodiments of the rivets, and
• 9 in a perspective exploded view of a rolling bearing with inventive roller bearing cage.

The Indian 1 illustrated rolling bearing cage 2 comprises two identical ring elements formed from sheet metal forming parts 4 . 6 , which in each case several distributed over the circumference, arranged by contact surfaces 8th . 10 Separate rolling body pockets 12 . 14 have, wherein the abutting contact surfaces 8th . 10 the two ring elements 4 . 6 over in this trained rivet holes 16 . 18 and rivets are riveted. The assembled rolling-body pockets 12 . 14 , here executed as ball bags, take the assigned balls 80 on.

2 shows an enlarged view of a section through two ring elements 4 . 6 with the associated rivet holes 16 . 18 before joining these ring elements 4 . 6 , A tubular rivet blank 20 with an end beaded edge portion 22 is provided.

In 3 are the two ring elements 4 . 6 already assembled and the rivet blank 20 is in the concentric rivet holes 16 . 18 the ring elements 4 . 6 introduced, wherein the first, flared edge portion 22 on an axially outer contact surface of the first ring element 4 is applied.

In 4 is also the other end edge section 24 of the rivet blank 20 crimped, so that this on the axially outer contact surface of the second ring element 6 lies flush, whereby the riveting process is completed.

5a shows a cut from a pipe string, not shown, cut tubular rivet blank 26 with a tubular central section 28 , Whose ends each aufzubördelnde edge portions 30 . 32 form. In 5b is the viewer facing first edge portion 30 radially crimped so that the thus prepared rivet 90 can be provided for further processing. In 5c is also the second edge section 32 radially crimped and thus shows the state after riveting according to 4 ,

The 6a to 6c show a rivet blank 34 about according to the 5a However, the two edge sections 36 . 38 each recesses 40 . 42 have, on the one hand simplify a radial Aufbördeln and on the other hand save weight.

7a shows a cut off from a flat ribbon strand, not shown, flat band section 44 with a central region forming the later tubular central section 46 and two later areas forming the later edge portions 48 . 50 , In 7b is the ribbon section 44 to a tubular rivet blank 51 reshaped and the first lateral area 48 is to a first edge section 52 crimped, so that a prepared for further processing rivet 90 is formed. In 7c is also the second side area 50 to a second flared edge portion 54 reshaped.

8a also shows a cut off from a flat ribbon strand, not shown, ribbon portion 56 with a middle section forming the later middle section 58 and two later edge sections 72 . 74 forming lateral border areas 60 . 62 , At the two lateral ends of the ribbon section 56 are each two end cutouts 64a ; 64b and in the middle of the ribbon section 56 are two of them border areas 60 . 62 capturing lateral cutouts 66a . 66b educated.

8b shows a flat strip section formed into a tubular rivet blank 56 , where the in 8a described end cutouts 64 . 66 each axially recesses 68 . 70 form the recesses 40 . 42 in 6 correspond. Next is a first edge section 72 radially crimped and thus a prepared rivet 90 formed while in 8c both edge sections 72 . 74 are radially crimped, according to the preceding 5c . 6c and 7c ,

9 shows an exploded view of a ball bearing using a roller bearing cage 2 according to the present invention, with an outer ring 76 and an inner ring 78 between which balls 80 are arranged. There are also two ring elements 82 . 84 recognizable, in the manner described with their respective associated contact surfaces 86 . 88 put together and by means of the rivet 90 be riveted. The mounting of the bearing can be done in such a way that after filling the bearing with the balls 80 the two ring elements 82 . 84 be put together so that the balls 80 from the associated rolling-body pockets 12 . 14 be recorded, whereupon then the ring elements 82 . 84 be riveted.

LIST OF REFERENCE NUMBERS

2

Rolling bearing cage

4

ring element

6

ring element

4.6

Ring members pair

8th

Contact surface on the ring element 4

10

Contact surface on the ring element 6

12

rolling body

14

rolling body

16

rivet hole

18

rivet hole

20

Nietrohling

22

edge section

24

edge section

26

Nietrohling

28

midsection

30

First edge section

32

Second edge section

34

Nietrohling

36

First edge section

38

Second edge section

40

First recess

42

Second recess

44

Ribbon section

46

Middle area of the flat band section 44

48

First lateral area of the flat band section 44

50

Second lateral area of the flat band section 44

51

Nietrohling

52

First edge section

54

Second edge section

56

Ribbon section

58

Middle region of the flat band section 56

60

First lateral area of the flat band section 56

62

Second lateral area of the flat band section 56

64a

End first cutouts

64b

End second cutouts

66a

Longitudinal first section

66b

Longitudinal second cutout

68

First recess

70

Second recess

72

First edge section

74

Second edge section

76

outer ring

78

inner ring

80

roll

82

ring element

84

ring element

86

contact surface

88

contact surface

90

rivet

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 2791523 B1 [0003]

Claims (4)

Rolling bearing cage (2) with two identical, formed from Blechumformteilen ring elements (4, 6), each having a plurality of circumferentially distributed, by abutment surfaces (8, 10) spaced from each other rolling bearing pockets (12, 14), wherein the abutting contact surfaces ( 8, 10) of the two ring elements (4, 6) are riveted into said rivet holes (16, 18) by means of rivets, characterized in that the rivets (90) as hollow rivets with a tubular central portion (28) and at both ends thereof radially outwardly flanged edge portions (30, 32) are formed. Method for producing and mounting a roller bearing cage (2) according to Claim 1 characterized by the steps of: - providing tubular rivet blanks (26); - Beading of an edge portion (30) of the rivet blanks (26) each to a prepared rivet; - Inserting the prepared rivet in associated rivet holes (16, 18) of a contiguous ring element pair (4/6); - Beading the other edge portions (32) of the prepared rivet (90). Method according to Claim 2 , characterized in that a tubular rivet blank (26) is cut from a tubing string. Method according to Claim 2 , characterized in that a ribbon portion (44, 56) is cut from a flat strand and formed into a tubular rivet blank (51).

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