DE102009037573A1 - roller bearing - Google Patents

Abstract

The invention relates to a rolling bearing (1, 28) which has at least one first row (2) of rolling elements (3) and at least one second row (4) of rolling elements (3), an intermediate ring (5) for both rows (3, 4), has an inner bearing ring (7, 29) for the first row (2) and an outer bearing ring (6) for the second row (4).

Description

Field of the invention

• – der Zwischenring mit einer äußeren Laufbahn für die Wälzkörper der ersten Reihe und mit einer inneren Laufbahn für die Wälzkörper der zweiten Reihe versehen ist,
• – die Wälzkörper der ersten Reihe jeweils im berührenden Kontakt zu dem inneren Lagerring und die Wälzkörper der zweiten Reihe jeweils im berührenden Kontakt zu dem äußeren Lagerring stehen,
• – die Ringe konzentrisch zur Rotationsachse des Wälzlagers angeordnet sind,
• – zwischen dem inneren Lagerring und dem Zwischenring ein erster Ringspalt ausgebildet ist, in dem die erste Reihe Wälzkörper angeordnet ist
• – zwischen dem Zwischenring und dem äußeren Lagerring ein zweiter Ringspalt ausgebildet ist, in dem die zweite Reihe Wälzkörper angeordnet ist,
• – die Ringspalte beidseitig der Wälzkörper abgedichtet sind.

The invention relates to a rolling bearing having at least a first row of rolling elements and an at least second row of rolling elements, an intermediate ring for both rows, an inner bearing ring for the first row and an outer bearing ring for the second row, wherein

• - The intermediate ring is provided with an outer raceway for the rolling elements of the first row and with an inner raceway for the rolling elements of the second row,
• - The rolling elements of the first row are each in touching contact with the inner bearing ring and the rolling elements of the second row in each case in touching contact with the outer bearing ring,
• - The rings are arranged concentrically to the axis of rotation of the bearing,
• - Between the inner bearing ring and the intermediate ring, a first annular gap is formed, in which the first row of rolling elements is arranged
• - Between the intermediate ring and the outer bearing ring, a second annular gap is formed, in which the second row of rolling elements is arranged,
• - The annular gaps are sealed on both sides of the rolling elements.

Background of the invention

Such a rolling bearing is in DE 103 24 259 A1 described in more detail. The rolling bearing is an angular contact ball bearing having at least a first row of rolling elements in the form of balls and an at least second row of rolling elements in the form of balls. The angular contact ball bearing can also be referred to as a three-ring bearing, since it has an intermediate ring for both rows, an inner bearing ring for the first row and an outer bearing ring for the second row. The inner bearing ring has an inner raceway for the balls of the first row. The outer race for the balls of the first row is formed on the common for both rows intermediate ring. The intermediate ring also has the inner raceway for the balls of the second row. The outer bearing ring is provided with the outer race for the balls of the second row.

The Rings are concentric with the axis of rotation of the rolling bearing arranged and at least partially pushed axially into each other, so that the outer bearing ring the intermediate ring and the intermediate ring the inner bearing ring in each case at least one rotationally symmetric section circumferentially surrounds.

The Rings are arranged in such a way that they radially the rolling elements between them and limit radial gaps in the radial direction, partly filled by the bullets, their cage and by fat are.

The Ring gaps are on both sides of the rolling elements with Seals sealed. Under seal is also the non-contact Dense with gap seals as sliding sealing contact to the To understand sealing zones. Density zones are the zones where against each other relatively movable elements of the bearing the annular gaps axially outward or inward.

at high speeds and thus with increasing influence of centrifugal force and / or at higher temperatures due to the relative low consistency, it is difficult to grease in rolling contact and to keep in the rolling bearing. At such camps are therefore often specially designed of the cages and elaborate Realized seals that make the bearing more expensive.

In Powertrains with double clutch are common Bearings with relatively large diameters and high rated speeds in use. Besides, these camps are due to their proximity to the internal combustion engine and clutch additional loads Dust of the abrasion of the clutch and exposed to high temperatures.

DE103 14 259A1 provides per row two seal arrangements in clutch release bearings, which have on one side of the three-row bearing gap seals and on the other side sealingly fitting lip seals. Although lip seals seal well at the sealing zones, they generate friction due to the sliding sealing contact. In addition, the cost of gaskets, especially when used in non-cutting angular contact ball bearings made of sheet metal, can account for half of the total cost of the bearing.

Description of the invention

The The object of the invention is to provide a rolling bearing, its seal arrangement, despite the high set to this Making requirements simple and inexpensive.

These Task is with the subject of claim 1 and another independent claim solved.

The rolling bearing may have as rolling elements balls and / or rollers with the same or different from row to row diameters. It can be formed two or more rows. Between adjacent rows, a common intermediate ring is arranged in each case. Under adjacent Rows are to be understood those whose rolling bodies lie on pitch circles with the same diameter or whose pitch circles differ. The invention accordingly applies to radial and / or axial roller bearings.

Of the Intermediate ring is in any case with an outer Raceway for the rolling elements of the first Row and with an inner race for the rolling elements of the second row provided. Under a common bearing ring is a one-piece or composed of any number of pieces Understand component to which at least two of the pitch circle or type her distinctive series of rolling elements roll, which is arranged as an intermediate ring between these rows is, and therefore at half the speed of the total speed of the bearing rotates.

The Rolling also has at least one inner bearing ring (inner ring) or at least one outer Bearing ring (outer ring) on. In cases where the rolling bearing more than a first row or a second Row, the inner bearing ring and / or the outer Bearing ring also be designed as intermediate rings. At this Bearing rings are corresponding inner and outer Runways formed for the rolling elements of the rows.

Conceivable is also that inner bearing rings, intermediate ring and outer Bearing rings more than a similar or in terms of Design distinctive inner and / or outer Running track have.

The first rows differ from the second rows by the first rows Diameter of their pitch circles and / or by the type of bearing assembly. It is irrelevant how many first rows and second rows having the rolling bearing. However, all first rows of a warehouse the same pitch circle and / or are of the same Bearing type. Accordingly, all second rows have a Rolling bearing among themselves the same pitch circles on and / or are of the same storage type. It is also conceivable that the inventive Rolling bearings third, fourth and nth rows of rolling elements which extends from the other ranks through other subcircles and / or storage types differ. So it is conceivable that in one Bearing arrangement Radial deep groove ball bearings with angular contact ball bearings and or four-point bearings are combined.

The Invention applies to rolling bearings in which all bearing Rolling elements of the rows to each other the same or differing in diameter.

Inner Runways are the raceways of a row, the axis of rotation are closer than the outer raceway in the same series. The contours of the inner raceways are around the axis of rotation by outer circumferences and the Contours of the outer raceways by Innenumfänge described. These definitions of careers also allow for that inner raceway (s) of a row in total or part through Outside circumferences are described, the larger are as the inner circumferences, through which the outer Track one or more other rows are described. The Runways are formed on components that are either the classic rolling bearing rings are or directly on shafts, bolts, housings and hollow cylindrical Components of any kind.

The Bearing rings of the bearing are concentric to the axis of rotation the rolling bearing axially adjacent and / or arranged nested. In radial rolling bearings, the outer surrounds Bearing ring preferably at least a portion of the intermediate ring circumferentially. At the same time and or alternatively, a portion of the inner bearing ring surrounded by the intermediate ring.

Prefers is the application of the inventions in angular contact ball bearings intended. Under angular contact bearings are the bearing arrangements to understand where the pressure lines are not like deep groove ball bearings radial to the bearing center axis but obliquely to this extend. The printing line run between the contacts of the rolling elements on the inner raceway and the outer raceway. The pressure line extends in an imaginary axial along the Rotation axis of the rolling bearing extending through the rolling elements and raceways laid cutting plane. The cutting plane runs through the contacts of the rolling elements with the inner Career and the outer career.

The Rings are thus arranged with radial or axial distance to each other, that between them each annular gaps are formed. The annular gap can be substantially spherical, hollow cylindrical or annular disk-shaped or any other basic shapes to be sealed. In the annular gaps sit one or more of the respective rows.

According to the invention it is provided that both annular gaps at least on one side the rows sealed together by means of only one seal assembly are. Another independent claim provides that a sealing arrangement at least one at least partially having disc-shaped sealing element formed, which of one of the bearing rings goes off while one of the Radial bridged annular gap, then further contactless oriented to the intermediate ring in the direction of the other bearing ring is.

Instead of two seal arrangements per side of the bearing, both sides are preferably provided with only one seal arrangement. The sealing arrangement is formed of at least one and alternatively of two and more sealing elements, of which at least one of a seal carrier in the direction of the intermediate ring primarily radially aligned and thereby completely covers the annular gap axially and then extends past the intermediate ring and the other annular gap with seals.

Of the Advantage of such arrangements lies in the opposite the rolling bearings of the prior art sealing arrangements and thus sealing elements are saved. The rolling bearing is easy and inexpensive to produce.

Farther The number of sealing zones can be reduced so that the rolling bearing is better sealed. An embodiment of the invention therefore provides before, that the seal arrangement only an outside Has sealing zone. The axially outer sealing zone is a sealed interface between the bearing interior of the Rolling bearing and its surroundings. The sealing zone can through a sliding seal or, as an embodiment of the invention provides, be formed by a gap seal.

By The use of gap seals can cause friction losses be reduced in the rolling bearing and on the other hand can up dispensed with the use of expensive elastic sealing lips. Of the Use of disc-shaped sealing elements is possible in almost any form simple and inexpensive produced by punching, bending, stamping and drawing from sheet metal are. A particularly simple gap seal is for example by a sealing washer and a sealing gap between the sealing washer and a corresponding inside or outside cylindrical Surface of a bearing ring formed.

Farther can be more disc-shaped or with arbitrary Cross-section profiled sealing rings made of sheet metal to each other Combine labyrinth seals.

A Further embodiment of the invention provides that one of the sealing elements is formed integrally with one of the bearing rings. Such a thing Sealing element is for example a radial flange made of a collar or a perforated bottom of a cup-shaped and formed as a drawing part bearing ring is formed. Prefers is at least one sealing gap between the flange and one of the bearing rings designed so that entirely on separate sealing elements can be omitted and the bearings even cheaper can be produced.

When Carrier for the sealing elements are optional the inner, the outer or the intermediate rings provided the rolling bearing according to the invention. Sealing gaps are optional between the sealing elements themselves or between sealing elements and one or more of the aforementioned bearing rings educated.

The Sealing elements are integral with the respective seal carrier trained or sitting as separate components on this. sealing elements are all components that come together with at least one other element the seal assembly form a seal. The sealing elements are lips that come together with one or more sealing surfaces to form a seal. Alternatively, sealing elements are preferred however, sheet metal rings in the form of sealing plates, centrifugal discs and angle rings, which together with one or more sealing gaps gap seals or make labyrinth seals. Gap seals are preferred because they are contactless and therefore no friction in the Create rolling bearings.

Detailed description the drawing

components with the same meaning are given the same reference numerals.

1 shows a rolling bearing 1 in the embodiment of an angular contact ball bearing in a longitudinal section along its axis of rotation 18 , The rolling bearing 1 has at least one first row 2 rolling elements 3 and a second row 4 rolling elements 3 on. The rolling elements 3 are executed as spheres. Furthermore, the rolling bearing with an intermediate ring 5 provided and has an inner bearing ring 7 for the first row 2 and an outer bearing ring 6 for the second row 4 on.

The inner bearing ring 7 is a longitudinally sectioned cup-shaped member having a perforated bottom with a radially outwardly directed edge, which also serves as a flange 7a is designated. The outer bearing ring 6 is a cup-shaped component with a feeder 6b at the bottom and with a radially inwardly directed flange 6a between bearing ring and feeder 6b ,

The intermediate ring is with an outer raceway 8th for the rolling elements 3 the first row 2 and with an inner career 37 for the rolling elements 3 the second row 4 Mistake. The rolling elements 3 the first row 2 each stand on an inner track 9 in touching contact with the inner bearing ring 7 and the rolling elements 3 the second row 4 each in touching contact with an outer raceway 10 on the outer bearing ring 6 ,

The Rings 5 . 6 and 7 are concentric to Rotation axis of the rolling bearing 1 arranged. The outer bearing ring 6 surrounds the largely hollow cylindrical intermediate ring 5 periphery. Likewise, the inner bearing ring 7 from the intermediate ring 5 encompassed.

Between the inner bearing ring 7 and the intermediate ring 5 a first annular gap 11 educated. In the first annular gap 11 are the rolling elements 3 arranged in the first row and with a ball cage 19 guided. Between the intermediate ring 5 and the outer bearing ring 6 a second annular gap 12 educated. In the second annular gap 12 is the second row 4 rolling elements 3 by means of a ball cage 20 held.

The annular gap 11 and 12 are left with only one seal arrangement 13 and right with only one seal arrangement 14 sealed and at least partially filled with grease.

The outer bearing ring 6 is a seal carrier 15 and carries a sealing element 16 the seal arrangement 13 , Accordingly, the seal carrier 15 one to the intermediate ring 5 separate component. The sealing element 16 is a gasket 17 made of sheet metal, which consists of a hollow cylindrical seat 17a and from a cover 17b is formed. Hollow cylindrical seat 17a and cover 17b go to a duplication created by cold forming 17c into each other. The duplication 17c serves as an axial stop when the sealing element 16 in the outer bearing ring 6 is pressed.

In the seal arrangement 13 are both annular gaps 11 and 12 through the sealing element 16 largely sealed. The sealing element 16 forms two gap seals. The sealing washer 17 covers the annular gap 12 axially completely off and remains to the intermediate ring 5 without contact. This is largely in the direction of the inner bearing ring 7 radially aligned cover 17b slightly cranked at the radial height and limited to form a first gap seal of the seal assembly 13 an axial sealing gap 21 between the cover 17b and the front side 5a of the intermediate ring 5 ,

The seal arrangement 13 also has a to the outer bearing ring 6 separate sealing element 22 on, by a disc-shaped flange 7a of the inner bearing ring 7 is formed, which in this case a seal carrier 25 is. The sealing element 22 forms with the to the inner bearing ring 7 separate sealing element 15 a second gap seal of the seal assembly 13 passing through the cover 17b , the flange 7a and by an axial sealing gap 23 between the cover 17b and the flange 7a is formed. The sealing gap 23 is the only axially outer sealing zone of the seal assembly 13 , The seal arrangement 13 has a third gap seal, which through the radially outwardly facing end face 7b of the flange 7a , the inside of the intermediate ring 5 and by a radial sealing gap 24 is formed.

The seal arrangement 13 is therefore by a first at least partially disc-shaped sealing element 16 in the form of the sealing disc 17 formed by the outer bearing ring 6 that's one of the annular gaps 12 axially covering and that the other annular gap 11 at least one sealing zone 27 with at least one further element of the rolling bearing 1 in the form of the flange 7a seals.

The rolling bearing 1 is still with the seal assembly 14 provided, which is a sealing element 26 in the form of a one-piece with the seal carrier 15 trained disc-shaped flange 6a of the outer bearing ring 6 having. The flange 6a lies the gasket 17 opposite and covers the second annular gap 12 axially completely, without the intermediate ring 5 to touch. Between a cylindrical feeder 6b and an outer cylindrical portion of the inner race 7 is a sealing gap to form a gap seal 27 formed, so that the seal assembly 14 with only one through the sealing gap 27 justified sealing zone both annular gaps 11 and 12 seals without contact.

2 shows a rolling bearing 28 in the embodiment of an angular contact ball bearing in a longitudinal section along its axis of rotation 18 , The rolling bearing 28 has at least one first row 2 rolling elements 3 and a second row 4 rolling elements 3 on. The rolling elements 3 are executed as spheres. Furthermore, the rolling bearing with an intermediate ring 5 provided and has an inner bearing ring 29 for the first row 2 and an outer bearing ring 6 for the second row 4 on.

The intermediate ring 5 is with an outer career 8th for the rolling elements 3 the first row 2 and with an inner career 37 for the rolling elements 3 the second row 4 Mistake. The rolling elements 3 the first row 2 each stand on an inner track 9 in touching contact with the inner bearing ring 29 and the rolling elements 3 the second row 4 each in touching contact with an outer raceway 10 on the outer bearing ring 6 ,

The Rings 5 . 6 and 29 are concentric to the rotation axis 18 of the rolling bearing 28 arranged. The outer bearing ring 6 surrounds a portion of the hollow cylindrical intermediate ring 5 periphery. Likewise, the inner bearing ring 29 from the intermediate ring 5 encompassed.

Between the inner bearing ring 29 and the intermediate ring 5 a first annular gap 11 educated. In the first annular gap 11 are the rolling elements 3 arranged in the first row and with a ball cage 19 guided. Between the intermediate ring 5 and the outer bearing ring 6 a second annular gap 12 educated. In the second annular gap 12 is the second row 4 rolling elements 3 by means of a ball cage 20 held.

The annular gap 11 and 12 are left with only one seal arrangement 30 and right with only one seal arrangement 14 sealed and at least partially filled with grease.

The outer bearing ring 6 is a seal carrier 15 and carries a sealing element 31 the seal arrangement 30 , Accordingly, the seal carrier 15 one to the intermediate ring 5 separate component. The sealing element 31 is a cap 32 made of plastic, with a hollow cylindrical seat 32b on the outer bearing ring 6 is snapped.

In the seal arrangement 30 are both annular gaps 11 and 12 sealed together by a seal, the two sealing elements 31 and 33 having, cooperating with each other at least the single axially outer sealing zone 34 the seal arrangement 30 form.

The cap 32 covers the annular gap 12 axially completely off and remains to the intermediate ring 5 non-contact and limited to form a first gap seal the seal assembly an axial sealing gap 21 between the cap 32 and the front side 5a of the intermediate ring 5 ,

The seal arrangement 30 also has that to the outer bearing ring 6 and the inner bearing ring 29 separate sealing element 33 on top of that by a slinger 35 is formed on the as a seal carrier 25 trained inner bearing ring 29 sitting.

The sealing element 31 forms with the to the inner bearing ring 29 separate sealing element 33 a gap seal of the seal assembly 30 passing through a cylindrical collar 32a the cap 32 , a cylindrical seat 35a and by a radial sealing gap 36 between the covenant 32a and the seat 35a is formed. The seal arrangement 30 has a third gap seal passing through a hollow cylindrical section 35b the slinger 35 , the inside of the intermediate ring 5 and by a radial sealing gap 24 between the hollow cylindrical section 35b and the inside of the intermediate ring is formed.

The seal arrangement 30 is therefore by a first at least partially disc-shaped sealing element 31 in the form of the cap 32 formed by the outer bearing ring 6 that's one of the annular gaps 12 axially covering and that the other annular gap 11 at least one sealing zone 34 with at least one further element of the rolling bearing 1 in the form of the slinger 35 non-contact seals.

The rolling bearing 1 is still with the seal assembly 14 provided, which is a sealing element 26 in the form of a one-piece with the seal carrier 15 trained disc-shaped flange 6a of the outer bearing ring 6 having. The flange 6a lies the cap 32 opposite and covers the second annular gap 12 axially completely, without the intermediate ring 5 to touch. Between a cylindrical feeder 6b and an outer cylindrical portion of the inner race 29 is a sealing gap to form a gap seal 27 formed, so that the seal assembly 14 Both annular gaps with only one sealing zone 11 and 12 seals.

LIST OF REFERENCE NUMBERS

1

roller bearing

2

first Row of rolling elements

3

rolling elements

4

second Row of rolling elements

5

intermediate ring

5a

front of the intermediate ring

6

outer bearing ring

6a

flange

6b

collection

7

internal bearing ring

7a

flange

8th

outer career

9

inner career

10

outer career

11

annular gap

12

annular gap

13

sealing arrangement

14

sealing arrangement

15

seal carrier

16

sealing element

17

sealing washer

17a

hollow cylindrical Seat

17b

cover plate

17c

duplication

18

axis of rotation

19

ball cage

20

ball cage

21

sealing gap

22

sealing element

23

sealing gap

24

sealing gap

25

seal carrier

26

sealing element

27

sealing gap

28

roller bearing

29

internal bearing ring

30

sealing arrangement

31

sealing element

32

cap

32a

Federation

32b

hollow cylindrical Seat

33

sealing element

34

sealing zone

35

slinger

35a

Seat

35b

section

36

sealing gap

37

inner career

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10324259 A1 [0002]
• DE 10314259 A1 [0008]

Claims (10)

Roller bearing ( 1 . 28 ), that at least one first row ( 2 ) Rolling elements ( 3 ) and at least a second row ( 4 ) Rolling elements ( 3 ), an intermediate ring ( 5 ) for both rows ( 3 . 4 ), an inner bearing ring ( 7 . 29 ) for the first row ( 2 ) and an outer bearing ring ( 6 ) for the second series ( 4 ), wherein - the intermediate ring ( 5 ) with an outer raceway ( 8th ) for the rolling elements ( 3 ) of the first row ( 2 ) and with an inner career ( 37 ) for the rolling elements ( 3 ) of the second row ( 4 ), - the rolling elements ( 3 ) of the first row ( 2 ) in each case in touching contact with the inner bearing ring ( 7 ) and the rolling elements ( 3 ) of the second row ( 4 ) in each case in touching contact with the outer bearing ring ( 6 ), - the rings ( 6 . 7 ) concentric with the axis of rotation ( 18 ) of the rolling bearing ( 1 . 28 ), - between the inner bearing ring ( 7 ) and the intermediate ring ( 5 ) a first annular gap ( 11 ) is formed, in which the first row ( 2 ) Rolling elements ( 3 ) is arranged - between the intermediate ring ( 5 ) and the outer bearing ring ( 6 ) a second annular gap ( 12 ) is formed, in which the second row ( 4 ) Rolling elements ( 3 ), - the annular gaps ( 11 . 12 ) on both sides of the rolling elements ( 3 ), characterized in that both annular gaps ( 11 . 12 ) at least on one side of the rows ( 2 . 4 ) together by means of a sealing arrangement ( 13 . 14 . 30 ) are sealed. Rolling bearing according to claim 1, characterized in that the sealing arrangement ( 13 . 14 . 30 ) has only one axially outer sealing zone. Rolling bearing according to claim 2, characterized in that the sealing zone is a sealing gap ( 23 . 27 . 34 ) is a gap seal. Rolling bearing assembly according to claim 3, characterized in that the gap seal by an at least partially disc-shaped sealing element ( 16 . 26 ) and through the sealing gap ( 23 . 27 ) between the sealing element ( 16 . 26 ) and one of the bearing rings ( 5 . 7 ) is formed. Rolling bearing according to claim 1, characterized in that the sealing arrangement ( 13 . 14 . 30 ) by a first at least partially disc-shaped sealing element ( 16 . 22 . 26 . 31 . 33 ) formed by one of the bearing rings ( 6 . 7 ) leaving one of the annular gaps ( 12 ) axially covers and the other annular gap ( 12 ) at least one sealing zone with at least one further element ( 6 . 7 . 16 . 22 . 26 . 31 . 33 ) of the rolling bearing ( 1 . 28 ) seals. Rolling bearing according to claim 5, characterized in that the further element of one of the bearing rings ( 6 . 7 ). Rolling bearing according to claim 5, characterized in that the further element has a second at least partially disc-shaped sealing element ( 33 ) of the sealing arrangement ( 30 ), wherein between the first sealing element ( 31 ) and the second sealing element ( 33 ) at least one sealing zone ( 34 ) is trained. Rolling bearing according to the preamble of claim 1, characterized in that a sealing arrangement ( 13 . 14 . 30 ) at least one at least partially disc-shaped sealing element ( 16 . 26 . 31 ), which of one of the bearing rings ( 6 ) and thereby first one of the annular column ( 12 ) radially bridged, then further contactlessly to the intermediate ring ( 5 ) in the direction of the other bearing ring ( 7 ) is oriented. Rolling bearing according to claim 8, characterized in that the sealing element ( 26 ) in one piece with a bearing ring ( 6 ) is trained. Rolling bearing according to claim 8, characterized in that two gap seals by means of the sealing element ( 16 ) are formed, wherein a first gap seal by the sealing element ( 16 ) and a sealing gap ( 21 ) between the intermediate ring ( 5 ) and the sealing element ( 16 ) is formed and a second gap seal by the sealing element ( 16 ) and a sealing gap ( 23 ) between one of the bearing rings and the sealing element ( 16 ) are formed.

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