DE102012203803A1 - Rolling bearing with split bearing ring unit - Google Patents

Abstract

The invention relates to a roller bearing (20), which in a known manner comprises a bearing ring unit (23) axially divided into a first (2) and a second (11) bearing ring and a number of rolling elements (22). The first bearing ring (2) has an axial centering projection (1) for centering on the second bearing ring (11). The second bearing ring (11) has a receiving region (10) into which the centering projection (1) engages. According to the invention, the centering projection (1) of a lateral surface of the first bearing ring (2) and the receiving region (10) of a lateral surface of the second bearing ring (11) are integrally formed.

Description

Field of the invention

The invention relates to a roller bearing comprising a bearing ring unit axially divided into a first and a second bearing ring, as well as a number of rolling elements. The first bearing ring has an axial centering projection for centering on the second bearing ring. The second bearing ring contains an axial receiving area in which the centering projection engages.

Background of the invention

A rolling bearing is used in various technical applications to support relatively movable, in particular rotatable parts in machines and lead and absorb the external forces acting and transmit to a housing or the like. For example, the rotor shaft of a wind turbine is usually rotatably supported relative to the housing by means of a so-called two-point or three-point bearing with two or three separate bearing points. In order to allow a more compact design, the storage is often carried out as a one-point storage. For a corresponding embodiment of the bearing, for example, a rolling bearing of the type described above is used in the embodiment as a double-row tapered roller bearing.

When used in a modern wind turbine with a large rotor and large rotor shaft correspondingly large bearings are needed. Due to this necessary size and the resulting weight of their production and assembly is usually extremely demanding. Therefore, a split bearing ring is usually used, in particular due to a simplified manufacturing and assembly, the bearing ring halves must be mounted centered in the assembly of the bearing usually centered.

The DE 10 2007 062 056 A1 discloses, for example, a multi-row roller bearing, which comprises an axially divided outer ring consisting of at least two coaxial rings in order to harden the rings independently of one another. According to one exemplary embodiment of DE 10 2007 062 056 A1, the end face of a ring has a cavity into which a connecting element of the front face of an adjacent ring facing this face engages. Between the connecting element and the complementary cavity there are radially two contact surfaces in the assembled state, in particular there is an interference fit. The engagement of the connecting element of a contact surface in an opposite cavity of the adjacent contact surface should allow a centering of the rings, as well as a transmission of force in the radial direction between these rings.

The disadvantage here, however, the arrangement of the connecting element and the cavity at the respective end faces of the rings, as well as their geometric shape, as this makes a very accurate and therefore expensive production required and also complicates the merging of the rings during assembly.

Object of the invention

Against this background, the present invention seeks to provide a roller bearing, which allows a simple and cost-effective production and assembly.

Solution of the task

This object is achieved by the features of claim 1. Advantageous embodiments and further developments of the invention are set forth in the dependent claims and the description below.

A rolling bearing comprises, in a known manner, a bearing ring unit axially divided into a first and a second bearing ring and a number of rolling elements. The first bearing ring has an axial centering projection for centering on the second bearing ring. The second bearing ring has a receiving area in which the centering projection engages.

According to the invention, the centering projection of a lateral surface of the first bearing ring and the receiving region of a lateral surface of the second bearing ring are integrally formed.

The invention is based on the idea of designing and dividing a split bearing ring unit of a roller bearing so that it can be manufactured relatively inexpensively and assembled simply and precisely in terms of assembly. Further, the invention is based on the consideration that it significantly simplifies the assembly process when an axially split bearing ring unit can be attached directly to the housing, without previously for the purpose of centering the bearing rings on a supporting shaft, in particular by relatively complex shrinking mount to have to. Therefore, the invention provides, with a receiving area and engaging therein axial centering projection on the respective lateral surfaces of a first and a second bearing ring of a split bearing ring unit to provide two easy-to-manufacture elements by means of which the two bearing rings can be centered to each other. Because of that Receiving area and the centering projection of the respective lateral surface are integrally formed, a simple manufacturing and assembly is a visually easy to control and exact positioning allows without having to provide additional time and cost-intensive steps or components. The rolling bearing has an axis of rotation, and it may be a standard type, such as a self-aligning ball bearings, angular contact ball bearings, cylindrical roller bearings or tapered roller bearings, as well as a special design. In particular, it is a multi-row roller bearing. Accordingly, the rolling elements can be configured, for example, as a ball, cylinder or cone.

The axially split bearing ring unit may be both an outer ring, as well as an inner ring of a rolling bearing. In this case, the bearing ring unit can be divided into an identically sized first and second bearing ring, which each have the same inner and outer diameter, and the same axial length. In particular, however, the first and the second bearing ring can also have different axial lengths.

A lateral surface of a first bearing ring of the split bearing ring unit has a centering projection formed on it. A lateral surface of a second bearing ring of the split bearing ring unit is formed a receiving area. The centering projection and the receiving area extend in the axial direction. The centering projection of the first bearing ring engages in the assembled state in the receiving area of the second bearing ring. By this intervention, a power transmission is also possible in the radial direction of the first bearing ring in the second bearing ring and vice versa, so that the component functionality of the split bearing ring unit is maintained. In this case, the centering projection and the receiving area are dimensioned such that the first and the second bearing ring are centered with each other when the centering projection engages in the receiving area. Between the centering projection and the receiving area can be present a positive, non-positive or cohesive connection.

The centering projection may be integrally formed on the radially outer lateral surface. Accordingly, the receiving area of the outer circumferential surface of the second bearing ring can be formed. Alternatively, it is also possible that the centering projection and the receiving region of the respective radially inner circumferential surface, or both of the respective outer and the respective inner circumferential surface are integrally formed.

The centering projection and the receiving region can be integrally formed on the respective lateral surface and, in particular, produced by machining the respective lateral surface, such as, for example, milling or turning. Alternatively, it is also possible that, in particular, the centering projection has been manufactured as a separate component and, for example, has been attached to the lateral surface of the first bearing ring via a welded connection.

Centering projection and receiving area may further be formed completely circumferentially the corresponding lateral surface. Optionally, the centering projection and the corresponding receiving area are formed only partially circumferentially at a certain portion of the respective lateral surface. It is also possible that more than one centering projection and associated receiving area are formed distributed over the circumference. For example, two diametrically arranged centering projections of the lateral surface of the first bearing ring, and two corresponding diametrically arranged receiving areas of the lateral surface of the second bearing ring may be formed. However, in particular, three circumferentially equally spaced centering projections and the corresponding receiving areas of the respective lateral surface may be formed.

The embodiment of the invention has the advantage of a simple and inexpensive production. The centering projection and the receiving area can be manufactured with known and simple machines and tools on the easily accessible a lateral surfaces.

Another advantage is the quick and easy installation of the rolling bearing. About the centering and the receiving area first bearing ring and second bearing ring are arranged centered to each other. As soon as the centering projection of the first bearing ring comes into abutment with the receiving region of the second bearing ring, the first bearing ring is arranged centered relative to the second bearing ring. Due to the formation of the centering projection and the receiving area on the respective lateral surfaces, the assembly process can be optically easily controlled. If necessary centering projection and receiving area are easily accessible by their arrangement on the lateral surfaces, for example for assembly tools. In this way, the bearing rings of a split bearing ring unit can be accurately positioned in a simple and quick way.

In an expedient embodiment, the centering projection is radially free on one side in the receiving area. In other words, the centering projection engages radially only on a surface of the receiving area. A radially further outward or further inward lying additional radial contact between centering projection and receiving area is thus not before. As a result, the centering projection and the receiving area are easy to manufacture, since only the dimensions and tolerances with respect to this one radial contact must be maintained and coordinated with each other for their radial contact. Furthermore, this facilitates the assembly, since the merger of the first bearing ring and the second bearing ring must be considered radially only one contact.

In an advantageous embodiment, the axial cross section of the centering projection decreases in the direction of the receiving area. Conversely, this means that the axial cross section of the centering projection increases along the receiving region of the second bearing ring toward the annular body of the first bearing ring. In particular, the axial cross section increases continuously, so that the cross-sectional profile of the centering projection is substantially nose-shaped. Due to the increase in cross-section also increases the moment of resistance of the centering of the introduction of force in the receiving area axially in the direction of annular body of the first bearing ring.

In a further advantageous embodiment, the centering projection comprises a first radial contact surface and an axial end surface, wherein a concave material recess is formed along a boundary line between the first radial contact surface and the axial end surface. The first radial contact surface is that surface of the centering projection which extends axially along the receiving region of the second bearing ring and which is radially in contact with the receiving region. The axial end face adjoins the first radial contact surface and extends in the radial direction. By a concave material recess along the boundary line between these two surfaces is in this area an advantageous notch shape. As a result, the stress peaks occurring along the boundary line and thus the risk of breakage can be reduced.

Conveniently, the centering projection is axially free in the receiving area. This means that there is no axial contact between the receiving area and the centering projection engaging therein. This prevents possible axial forces, which result, for example, from a screw connection between the first bearing ring and the second bearing ring, act on the centering projection.

In an expedient embodiment, the receiving region is delimited by a second radial contact surface, and the second radial contact surface has a pre-centering section which is inclined in relation to the axial direction. The second radial contact surface is that surface of the receiving region which extends in the axial direction and which is radially in contact with the centering projection. The pre-centering portion is inclined away from the centering projection against the axial direction. In this case, the pre-centering section is configured at the axial end of the receiving region, which adjoins the first bearing ring. In particular, the pre-centering portion has only a small axial length in relation to the entire axial length of the receiving area. By Vorzentrierungsabschnitt the merging of the first bearing ring with the second bearing ring and thus their assembly is further simplified, as a result, a larger tolerance range during assembly and the first bearing ring can be "pushed" in particular on the second bearing ring.

The receiving area is advantageously limited by a collar, which is inclined in the direction of the receiving area and at the same time forms a contact surface for the rolling elements.

Conveniently, the bearing ring unit is a split inner ring.

In an advantageous embodiment, the rolling bearing is designed as a double-row tapered roller bearing. Accordingly, the rolling elements are designed here as a cone. Double row tapered roller bearings can be loaded radially and axially. The axially split bearing ring unit can be both an outer ring, as well as an inner ring of the tapered roller bearing.

Short description of the drawing

Embodiments of the invention will be explained in more detail below with reference to a drawing. Show:

1 in a schematic sectional view of an embodiment of a centering projection,

2 in a schematic sectional view of an embodiment of a receiving area, and

3 in a schematic sectional view of an embodiment of a rolling bearing.

Corresponding parts are always provided with the same reference numerals in all figures.

Detailed description of the drawing

In 1 is an embodiment of a centering projection 1 shown. The centering projection 1 is the lateral surface of a first bearing ring 2 integrally formed and extends in the axial direction. In this case, the centering projection comprises 1 a first radial contact surface 3 and an axial one face 4 , Along a boundary line between the first radial contact surface 3 and the axial end face 4 is a concave material recess 5 educated.

2 shows an embodiment of a receiving area 10 , which is the lateral surface of a second bearing ring 11 is formed. The receiving region has a second radial contact surface 12 on, at one axial end of a inclined against the axial direction Vorzentrierungsabschnitt 13 is trained. The recording area 10 also comes from a collar 14 bounded in the direction of the receiving area 10 is inclined and the one bearing surface 15 for conical rolling elements (not shown) forms. Along a boundary between the second radial contact surface 12 and collar 14 is a concave material recess 16 educated.

An embodiment of a rolling bearing 20 is in 3 shown. The rolling bearing 20 is designed as a double row tapered roller bearing. The tapered roller bearing consists essentially of an outer ring 21 , several tapered rollers 22 , as well as a shared bearing ring unit 23 , which forms the split inner ring of the tapered roller bearing. The tapered rollers 22 roll on raceways of the outer ring 21 and the split bearing ring unit 23 off and be through cage 24 kept at a uniform distance and prevented from mutual contact.

The shared bearing ring unit 23 includes a first bearing ring 2 and a second bearing ring 11 , The radially outer circumferential surface of the first bearing ring 2 is a centering projection 1 formed. The outer lateral surface of the second bearing ring 11 is a reception area 10 formed. The centering projection 1 and the recording area 10 are the respective lateral surface in each case integrally formed and completely encircling.

The centering projection 1 of the first bearing ring 2 reaches into the reception area 10 of the second bearing ring 11 one. Here is the centering projection 1 in the recording area 10 unilaterally radially exposed. This means that a radial contact between centering projection 1 and recording area 10 only between a first radial contact surface 3 of the centering projection 1 and a second radial contact surface 12 of the recording area 10 consists. As for the radial contact of centering projection 1 and recording area 10 When manufacturing only the dimensions and tolerances must be met with respect to this one radial contact, they are relatively easy to manufacture. The assembly is facilitated because when merging the first bearing ring 2 and second bearing ring 11 Radial attention must be paid only to this one contact.

At one of the first bearing ring 2 adjacent axial end of the second radial contact surface 12 of the recording area 10 is also a pre-centering section 13 educated. This pre-centering section 13 is inclined against the axial direction, wherein along the Vorzentrierungsabschnitts 13 the outer diameter of the second bearing ring 11 in the direction of the first bearing ring 2 decreases continuously. This will merge the first bearing ring 2 with the second bearing ring 11 further simplified, as this results in a larger tolerance range during assembly and the first bearing ring 2 in particular on the second bearing ring 11 Can be "postponed".

The recording area 10 is further from a collar 14 bounded in the direction of the receiving area 10 is inclined and the one bearing surface 15 for a face of the tapered rollers 22 forms. Along a boundary between the second radial contact surface 12 and collar 14 is a concave material recess 16 educated. This is the centering projection 1 in the recording area 10 axially free, leaving between the receiving area 10 and the centering projection engaging therein 1 there is no axial contact. This prevents axial forces on the centering projection 1 Act.

The centering projection 1 is also designed so that the axial cross section in the direction of the receiving area 10 decreases continuously. By this design, the moment of resistance of the centering projection decreases 1 from the introduction of force in the reception area 10 axially in the direction of the annular body of the first bearing ring 2 to. Furthermore, the centering projection 1 along a boundary line between the first radial contact surface 3 and an axial end surface 4 a concave material recess 5 educated. This advantageous notch shape reduces the stress peaks occurring along the boundary line and thus the risk of breakage in this area.

The centering projection 1 and the recording area 10 are dimensioned so that first bearing ring 2 and second bearing ring 11 already by the intervention of the centering projection 1 in the recording area 11 centered to each other. So as soon as during assembly of the split bearing ring unit 23 the centering projection 1 of the first bearing ring 2 with the recording area 10 of the second bearing ring 11 goes into attack, is the first bearing ring 2 centered to the second bearing ring 11 arranged. By the formation of the centering projection 1 and the reception area 10 on the respective lateral surfaces, for example, these are accessible to an assembly tool and the assembly process can also be optically easily controlled. This is a quick and easy installation of the roller bearing 20 possible. Furthermore, by the intervention of a power transmission in the radial direction of the first bearing ring 2 in the second bearing ring 11 and vice versa.

LIST OF REFERENCE NUMBERS

1

 centering

2

 first bearing ring

3

 first radial contact surface

4

 axial end face

5

 material recess

10

 reception area

11

 second bearing ring

12

 second radial contact surface

13

 Vorzentrierungsabschnitt

14

 collar

15

 contact surface

16

 material cut

20

 roller bearing

21

outer ring

22

 Tapered roller

23

 Bearing ring unit

24

 Cage

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 102007062056 A1 [0004]

Claims (9)

Roller bearing ( 20 ), comprising one in a first ( 2 ) and a second ( 11 ) Bearing ring axially divided bearing ring unit ( 23 ) and a number of rolling elements ( 22 ), the first bearing ring ( 2 ) an axial centering projection ( 1 ) for centering on the second bearing ring ( 11 ), and wherein the second bearing ring ( 11 ) an axial receiving area ( 10 ), in which the centering projection ( 1 ) engages, characterized in that the centering projection ( 1 ) a lateral surface of the first bearing ring ( 2 ) and the recording area ( 10 ) a lateral surface of the second bearing ring ( 11 ) are formed. Roller bearing ( 20 ) according to claim 1, characterized in that the centering projection ( 1 ) in the reception area ( 10 ) is radially free on one side. Roller bearing ( 20 ) according to claim 1 or 2, characterized in that the axial cross section of the centering projection ( 1 ) towards the receiving area ( 10 ) decreases. Roller bearing ( 20 ) according to one of the preceding claims, characterized in that the centering projection ( 1 ) a first radial contact surface ( 3 ) and an axial end face ( 4 ), and wherein along a boundary line between the first radial contact surface ( 3 ) and the axial end face ( 4 ) a concave material recess ( 5 ) is trained. Roller bearing ( 20 ) according to one of the preceding claims, characterized in that the centering projection ( 1 ) in the reception area ( 10 ) is axially released. Roller bearing ( 20 ) according to one of the preceding claims, characterized in that the receiving area ( 10 ) from a second radial contact surface ( 12 ) is limited, and that the second radial contact surface ( 12 ) an inclined against the axial direction Vorzentrierungsabschnitt ( 13 ) having. Roller bearing ( 20 ) according to one of the preceding claims, characterized in that the receiving area ( 10 ) of a collar ( 14 ), wherein the collar ( 14 ) in the direction of the receiving area ( 10 ) and at the same time a contact surface ( 15 ) for the rolling elements ( 22 ). Roller bearing ( 20 ) according to any one of the preceding claims, characterized in that it is in the bearing ring unit ( 23 ) is a split inner ring. Roller bearing ( 20 ) according to one of the preceding claims, characterized in that it is designed as a double-row tapered roller bearing.

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