DE102009051556A1 - Multiple-row antifriction bearing comprises inner ring arrangement and outer ring arrangement, where multiple rolling bodies are arranged between inner ring of inner ring arrangement and outer ring of outer ring arrangement - Google Patents

Abstract

The multiple-row antifriction bearing (1) comprises an inner ring arrangement (3a) and an outer ring arrangement (4a). Multiple rolling bodies (5,15) are provided, which are arranged between an inner ring (3,13) of the inner ring arrangement and an outer ring (4,14) of the outer ring arrangement. Two axially adjacent outer rings are detachably connected by a circular clamping element (20) made of plastic metal group.

Description

Field of the invention

The present invention relates to a multi-row rolling bearing with an inner ring assembly and an outer ring assembly, wherein between each an inner ring and an outer ring, a plurality of rolling elements is arranged, and each two axially adjacent outer rings lie with their facing axial end faces together.

Multi-row rolling bearings are known from the prior art. Each individual bearing forms a "row" and comprises an inner ring and an outer ring, between which rolling elements are arranged to be rollable. A plurality of rolling elements are usually each row in a cage separately guided and supported, so that the rolling elements cooperate with an annular raceway surface of the respective outer ring and another annular raceway of the respective inner ring. Each row serves the respective cage for the exact guidance of the rolling elements between the running surfaces and to ensure a uniform distance between the rolling elements. Each individual bearing or row of the inner ring is rotatable relative to the respective outer ring. Axially adjacent inner rings are usually connected by connecting elements, such as clamping elements.

Differently configured connecting elements for adjacent inner rings of the corresponding adjacent rows of rolling bearings are known. For example, special clip rings are known as connecting elements for inner rings. The clamp rings for inner rings are provided radially on the outside, for example with resilient projections, which can be engaged in form-matching, radially inwardly arranged on the two inner rings recesses or undercuts. In this way, a mutual fixation of the two inner rings in the axial direction. A disadvantage of such clip rings, however, is that the clip rings are damaged, bent or even pushed out of their anchorages in the undercuts of the inner rings when pushing or pressing the respective row.

The German patent application DE 10 2006 026 443 A1 discloses a sealing arrangement for sealing the parting line between multipart inner rings. Two adjacent inner rings lie with their facing axial end faces together. A sealing ring is arranged in a common annular groove of the inner rings and represents a connecting element between the two inner rings. The annular groove is formed by depressions in the region of the facing end faces of the inner rings. The common annular groove has a larger axial length in cross-section in the region of its bottom than in the radially outer region of the annular groove. A disadvantage of this rolling bearing is that a certain distance between the rows of rolling elements is given by the connecting element between two adjacent individual bearings, whereby a correspondingly large space for the rolling bearing is necessary. Another disadvantage is that the area of the rolling bearing around the connecting element between the individual bearings is unprotected against external influences such as dirt, moisture and dryness.

The German utility model DE 202 00 240 U1 discloses a rolling bearing with an annular connecting element for two adjacent inner rings of different bore diameter. The connecting element is arranged below the inner rings and holds the inner rings together by a press fit with the first inner ring, by a clearance fit with the second inner ring and by a projection corresponding to a shoulder of the second inner ring.

In the German patent DE 199 61 712 B4 is the connecting element for the inner and / or outer rings of a multi-row rolling bearing an assembly joint, which is an integral part of the inner ring and / or outer ring. One of the axially adjacent inner and / or outer rings projects beyond the other in a radial region of the assembly joint. In the radial region of the assembly joint, a radial recess is present in each of the contacting rings. Barbs of one ring engage in the groove of the other ring with axial play.

In the German patent application DE 42 26 618 A1 the connecting element for two bearing rings is a clamping sleeve. The staple sleeve comprises a bent to a slotted sleeve metal strip with radially projecting, in grooves of the bearing rings positively engaging retaining projections. On the circumference radially out of the sheet material by stamping out and stamped along a circumferential line of the staple sleeve in the required width punched out holding projections are distributed.

The US patent application US 1,908,474 A1 discloses an annular connector with inclined cam surfaces which are pressed against the surfaces of two adjacent inner races of a rolling bearing.

The German utility model DE 81 25 975 U discloses an elastic, tubular, cylindrical connecting element for the two inner rings of a multi-row roller bearing. The Base surfaces of the connecting element form bent edges towards the axis of the connecting element, which delimit openings whose diameters are smaller than the outer diameter of the small edges of the inner rings.

Object of the present invention is to provide a multi-row rolling bearing, which is made of simple and compact assembly units, so that two adjacent rows of bearings of the bearing are simple and inexpensive connectable.

The object is achieved by a multi-row roller bearing comprising the features of claim 1.

The multi-row roller bearing according to the invention comprises an inner ring arrangement and an outer ring arrangement. Between each an inner ring and an outer ring a plurality of rolling elements is arranged. Each two axially adjacent outer rings lie with their facing axial end faces together. According to the invention, the two axially adjacent outer rings are detachably connected by an annular clamping element in such a way that their mutually facing axial end faces are in abutment. As a result, the space remains minimal in the assembly of the components of the bearing and does not increase as in the prior art.

The clamping element can be arranged essentially in two ways. Either it is arranged outside on the respective two adjacent outer rings ("outer clamping element") and bridges the adjacent outer rings above their mutually facing axial end faces, or the clamping element is located inside ("inner clamping element") between the mutually facing axial end faces of the outer rings , A disadvantage of an outer clamping element is that it is less protected against environmental influences or mechanical damage during assembly. For an outer clamping element is easier to mount together with the two adjacent outer rings. On the other hand, an internal clamping element has the advantage that it is protected against the influences and mechanical impairments described above and is more difficult to assemble.

The adjacent outer rings should be sealed to the outside in the region of their adjacent axial end faces. This can be achieved via a corresponding design of an annular contact surface of the clamping element. In this case, the annular contact surface of the clamping element cooperates with a correspondingly corresponding annular surface which is formed from a first region of the first outer ring and a second region of the second outer ring. The contact surface of the clamping element can be realized by the geometric design and / or by a further plastic (multi-component structure) and / or by additional sealing elements, as will be described below.

The annular abutment surface of the outer or inner clamping element can be equipped, for example, with appropriate materials and / or bearing surface with an integrated sealing function.

Alternatively or additionally, at least one O-sealing ring may be arranged at least partially in or on the annular abutment surface of the outer or inner clamping element. The at least one O-ring seal is arranged opposite the first region of the first outer ring and / or opposite the second region of the second outer ring.

An inner clamping element may also alternatively or additionally comprise an integrally formed region with at least one sealing lip opposite an inner side of the inner ring arrangement. The sealing lips are resiliently supported against the inside of the inner ring assembly. In a specific embodiment, the molded-on region of the clamping element comprises a multiplicity of passages in the axial direction. Thus, the lubricant transfer can pass undisturbed through the passages.

The above-described embodiments of the inventive clamping element can be combined, so that, for example, an annular contact surface with inserted O-rings, the outer rings are provided to the outside, sealing lips in the direction of the inner ring assembly and passages within the clamping member. An advantage of such a combination is that no adjustment of the bearing clearance by the customer is necessary, the bearing rows are sealed and lubricated and protected against external influences such as dirt, moisture and drought.

The clamping element is preferably made of one or more plastic materials, for example by means of a single or multi-component injection molding process. The clamping element can also be made of a plastic-metal composite.

The invention is exemplified below for tapered roller bearings as rolling bearings. However, it applies mutatis mutandis to other types of bearings, such as ball bearings, without departing from the scope of the invention. Depending on the choice of rolling bearing design and as known in the art, outer and / or inner rims are required or required. Depending on the design then the forces to guide or support the rolling elements in the appropriate Cages and by the shelves differently sized and / or directional.

Although in the following description, the inner ring assemblies and outer ring assemblies each consist of two axially adjacent inner rings and two axially adjacent outer rings, so the rolling bearing comprises only two axially adjacent rows or single bearings, it is obvious to a person skilled in the art that the arrangements also more than two rings or in that the rolling bearing may comprise more than two rows without departing from the scope of the invention.

In the following, the invention and its advantages will be explained with reference to the accompanying figures. Showing:

1 a cross section of an embodiment of the rolling bearing according to the invention with an inner clamping element;

2 a detailed view of a section of the bearing after 1 wherein an annular abutment surface of the clamping member sealingly cooperates with portions of the first and second outer rings;

3 a cross section of another embodiment of the rolling bearing according to the invention with an outer clamping element;

4 a cross section of another embodiment of the rolling bearing according to the invention with an inner clamping element with O-rings;

5 a cross section of an embodiment of the rolling bearing according to the invention with an inner clamping element with sealing lips and passages; and

6 a cross section of another embodiment of the rolling bearing according to the invention with an inner clamping element with O-rings, sealing lips and passages.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are only examples of how the rolling bearing according to the invention can be configured and do not represent a final limitation.

1 shows a cross section of an embodiment of the rolling bearing according to the invention 1 with an annular clamping element 20 as a connecting element for an outer ring assembly 4a , which in this embodiment consists of two axially adjacent outer rings 4 . 14 consists. The inner ring arrangement 3a consists in this embodiment of two axially adjacent inner rings 3 . 13 ,

The clamping element 20 is inside between the facing axial end faces 6 . 16 the outer rings 4 . 14 arranged ("inner clamping element" 20 ). In 1 are two axially adjacent rows of bearings 2 . 12 , the rolling bearing 1 shown. The first row of bearings 2 includes the first outer ring 4 , the first inner ring 3 and a plurality of first rolling elements 5 rolling in between and in a first cage 10 supported. The second row of bearings 12 includes the second outer ring 14 , the second inner ring 13 and between a plurality of second rolling elements 15 rolling in between and in a second cage 110 supported.

The inner clamping element 20 has an annular contact surface 21 formed, which cooperates sealingly with a correspondingly corresponding annular surface. The corresponding annular surface is of a first region 8th of the first outer ring 4 and a second area 18 of the second outer ring 14 educated. The adjacent outer rings 4 . 14 are thus by the contact surface 21 in the region of their adjacent axial end faces 6 . 16 sealed to the outside.

seals 24 seal the rolling bearing 1 and protect the rolling elements 5 respectively. 15 and the treads 33 . 133 the inner rings 3 . 13 and the treads 43 . 143 the outer rings 4 . 14 against pollution.

In this embodiment, the first inner ring 3 an outboard 31 and an inboard 32 formed, between which the rolling elements 5 are guided laterally. The cage 10 retained and guided rolling elements 5 run along a tread 43 of the first outer ring 4 and along a tread 33 of the first inner ring 3 , Thus, the rolling elements 5 through the first cage 10 and at least the outboard 31 guided and supported.

Accordingly, in this embodiment, the second inner ring 13 an outboard 131 and an inboard 132 formed, between which the rolling elements 15 are guided laterally. The rolling elements 15 run along a tread 143 of the second outer ring 14 and along a tread 133 of the second inner ring 13 , Thus, the rolling elements 15 through the second cage 110 and at least the outboard 131 guided and supported.

Hereinafter, how the individual aforementioned elements in the embodiment according to 1 held together or secured. The rolling elements 5 . 15 are above the respective ones Cage 10 in the respective inner ring 3 . 13 regardless of the configuration of the outer ring assembly 4a on the inner ring 3 respectively. 13 secured. In addition, the rolling elements 5 respectively. 15 through the outboards 31 respectively. 131 on the inner ring 3 respectively. 13 secured. It is obvious to a person skilled in the art that in a design other than tapered roller bearings 1 also the inner rims 32 respectively. 132 for securing the rolling elements 5 respectively. 15 can contribute. Overall, you get an inner ring package with rolling elements 5 respectively. 15 a cage 10 and an inner ring 3 respectively. 13 , The inner rings 3 . 13 the inner ring arrangement 3a are only about the by the clamping element 20 connected outer rings 4 . 14 the outer ring assembly 4a held together. Alone have the inner rings 3 . 13 but no connection or fuse with each other. The inner rings 3 . 13 are not connected to each other during assembly, but only by the clipping of the outer rings 4 . 14 to an assembly unit. The inner rings 3 . 13 the inner ring arrangement 3a are thus securely connected to each other, so they need no additional connection element to their connection. The axially adjacent outer rings 4 . 14 according to the 1 to 6 Be a connection element, for example, the clamping element according to the invention 20 , held together, leaving a stable multi-row rolling bearing 1 is formed.

2 shows a detailed view of a section of the rolling bearing 1 to 1 with the inner clamping element 20 , All elements are already in 1 described.

3 shows a cross section of another embodiment of the rolling bearing according to the invention 1 with an annular clamping element 20 , which is arranged outside and the adjacent outer rings 4 . 14 above their mutually facing axial end faces 6 . 16 bridged ("outer clamping element" 20 ). Again, an annular contact surface 21 on the outer clamping element 20 educated. The contact surface 21 acts with a correspondingly corresponding annular surface of a first area 8th of the first outer ring 4 and a second area 18 of the second outer ring 14 sealing together. As already described above, the contact surface 21 additionally with at least one O-ring 22 be provided (not shown, see 4 . 6 ).

4 shows a cross section of another embodiment of the rolling bearing according to the invention 1 with an inner clamping element 20 with two O-rings 22 , The one O-ring 22 is opposite the first area 8th of the first outer ring 4 arranged. The other O-ring 22 is opposite the second area 18 of the second outer ring 14 arranged. Every O-ring 22 runs like a tube along the annular contact surface 21 ,

5 shows a cross section of an embodiment of the rolling bearing according to the invention 1 with an inner clamping element 20 with two sealing lips 23 and a variety of passages 25 for lubricants. The clamping element 20 includes a molded area 26 , on which two annularly extending sealing lips 23 are formed. The sealing lips 23 are opposite to an inside 9 the inner ring arrangement 3a are resiliently supported against the inside 9 the inner ring arrangement 3a from. The passages 25 are in the ring-shaped integrally formed area 26 admitted.

6 shows a cross section of another embodiment of the rolling bearing according to the invention 1 with an inner clamping element 20 with two O-rings 22 opposite the areas 8th . 18 the outer rings 4 . 14 , two sealing lips 23 that are against the inside 9 the inner ring arrangement 3a support, and a variety of passages 25 for lubricants in the molded area 26 , The clamping element 20 to 6 So is a combination of clamping elements 20 after the 4 and 5 ,

The present invention has been described in terms of preferred embodiments. Nevertheless, changes and modifications of the proposed designs of the multi-row rolling bearing 1 be carried out without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1

roller bearing

2

first row (first single bearing)

3a

Inner ring arrangement

3

first inner ring

4a

Cup assembly

4

first outer ring

5

first rolling element

6

first end face of the first outer ring

7

first outside of the first outer ring

8th

first area of the first outer ring

9

Inside of the inner ring assembly

10

first cage (of the first inner ring)

12

second row (second single bearing)

13

second inner ring

14

second outer ring

15

second rolling element

16

second end face of the second outer ring

17

second outer side of the second outer ring

18

second area of the second outer ring

20

Clamping element, connecting element

21

annular contact surface

22

O-ring seal

23

sealing lip

24

poetry

25

passage

26

molded area

31

Outboard of the first inner ring

32

Inboard of the first inner ring

33

inner race of the first inner ring

43

outer race of the first inner ring

110

second cage (the second inner ring)

131

Outboard of the second inner ring

132

Inboard of the second inner ring

133

inner race of the second inner ring

143

outer race of the second inner ring

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

• DE 102006026443 A1 [0004]
• DE 20200240 U1 [0005]
• DE 19961712 B4 [0006]
• DE 4226618 A1 [0007]
• US 1908474 A1 [0008]
• DE 8125975 U [0009]

Claims (9)

Multi-row rolling bearing ( 1 ) with an inner ring arrangement ( 3a ) and an outer ring arrangement ( 4a ), wherein between each one inner ring ( 3 . 13 ) of the inner ring arrangement ( 3a ) and an outer ring ( 4 . 14 ) of the outer ring arrangement ( 4a ) a plurality of rolling elements ( 5 . 15 ) is arranged, and two axially adjacent outer rings ( 4 . 14 ) with their mutually facing axial end faces ( 6 . 16 ) lie against each other, characterized in that the two axially adjacent outer rings ( 4 . 14 ) by an annular clamping element ( 20 ) are releasably connected such that their mutually facing axial end faces ( 6 . 16 ) Are in shock. Roller bearing ( 1 ) according to claim 1, wherein the clamping element ( 20 ) on the outside of the two adjacent outer rings ( 4 . 14 ) is arranged and the outer rings ( 4 . 14 ) above their mutually facing axial end faces ( 6 . 16 ) bridged. Roller bearing ( 1 ) according to claim 1, wherein the clamping element ( 20 ) in the interior between the mutually facing axial end faces ( 6 . 16 ) of the outer rings ( 4 . 14 ) is arranged. Roller bearing ( 1 ) according to one of the preceding claims, wherein the clamping element ( 20 ) an annular contact surface ( 21 ) formed with a correspondingly corresponding annular surface which consists of a first region ( 8th ) of the first outer ring ( 4 ) and a second area ( 18 ) of the second outer ring ( 14 ) is formed, sealingly cooperates. Roller bearing ( 1 ) according to one of the preceding claims, wherein the clamping element ( 20 ) at least one O-ring ( 22 ), which is opposite the first area ( 8th ) of the first outer ring ( 4 ) and / or in relation to the second area ( 18 ) of the second outer ring ( 14 ) is arranged. Roller bearing ( 1 ) according to one of claims 3 to 5, wherein the clamping element ( 20 ) an integrally formed area ( 26 ) with at least one sealing lip ( 23 ) against an inside ( 9 ) of the inner ring arrangement ( 3a ), wherein the at least one sealing lip ( 23 ) resilient against the inside ( 9 ) of the inner ring arrangement ( 3a ) is supported. Roller bearing ( 1 ) according to claim 6, wherein the molded-on area ( 26 ) of the clamping element ( 20 ) a multitude of let through ( 25 ) in the axial direction. Roller bearing ( 1 ) according to one of the preceding claims, wherein the clamping element ( 20 ) is made of one or more plastic materials. Roller bearing ( 1 ) according to one of the preceding claims, wherein the clamping element ( 20 ) is made of a plastic-metal composite.

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