EP2707613A1

EP2707613A1 - Radial rolling bearing

Info

Publication number: EP2707613A1
Application number: EP12715666.9A
Authority: EP
Inventors: Rainer Schröder
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2011-05-12
Filing date: 2012-04-12
Publication date: 2014-03-19
Also published as: DE102011075730A1; US20140169717A1; WO2012152519A1; US9011017B2

Abstract

The invention relates to a radial rolling bearing (10) with rolling bodies (24) which are received in at least one cage (26, 28) and which are arranged between an inner ring (20) and an outer ring (22). The radial rolling bearing (12) is designed to be radially separable, and the radially multipart inner ring (20) can be fixed on a shaft (16) using two clamping rings (36, 38) which are attached to the axial ends of said inner ring. According to the invention, the inner ring (20) is designed without rims on the axially outer sides, and the clamping rings (36, 38) take on the function of inner ring rims, said rolling bodies (24) running against inner run-on surfaces (50) of the clamping rings (36, 38) in the axial direction. On the basis of the at least partial positioning of the clamping rings (36, 38) axially below the cages (26, 28) or the outer ring (22), the clamping rings (36, 38) take on two additional functions in addition to the actual clamping ring main function of fixing the inner ring (20) on the shaft (16). Firstly, the clamping rings (36, 38) form a cage guide in the radial direction, and secondly, said clamping rings assist the axial guiding of the rolling bodies (24) by means of the inclined inner run-on surfaces (50). The radial rolling bearing additionally has a reduced axial installation dimension on the basis of the special arrangement of said clamping rings (36, 38) in the radial rolling bearing.

Description

Name of the invention

Radial rolling bearing description

Field of the invention

The invention relates to a radial roller bearing with rolling elements, which are accommodated in at least one cage and disposed between an inner ring and an outer ring, wherein the radial roller bearing is formed radially divisible, and in which the radially multi-part inner ring by means of two axially end to this applying clamping rings a shaft is fastened. Background of the invention

Divisible radial roller bearings are widely used in the art for low-friction and low-wear storage of machine parts. For divisible radial roller bearings clamping rings are placed around, for example, half-shell-shaped inner ring segments of the bearing to fix them on a shaft. All other components of the radial roller bearing, in particular the outer ring and the Wälzkörperkäfig are also designed to be radially divisible or segmented, so that they can be easily mounted around a continuous shaft around. An elaborate pulling out of the shaft of drive technology upstream or downstream machine parts thereby eliminates advantageous. Such split radial rolling bearings are used in applications in which a bearing replacement would otherwise lead to a high disassembly effort through the dismantling of the adjacent machine parts. In addition, defective bearings can be retrofitted in a simple manner with divisible radial roller bearings. In known radially divisible radial rolling bearings, the clamping rings are arranged laterally on the left and right retaining rims of the inner ring, whereby the Axialbaulänge this camp considerably increased compared to non-divisible radial rolling bearings and, for example, the Nachrüs- tion on old bearings or bearing housings with usually limited installation space difficult, if not impossible.

Further, split spherical roller bearings are also known, which allow in addition to the primary bearing function to compensate for an angular offset of up to a few degrees in relation to adjacent machine parts, such as engines, transmissions, clutches or the like. The separable spherical roller bearings therefore allow not only the easy repair of an old bearing in case of failure or maintenance, the compensation of not fully aligned machine parts.

From DE 1 958 363 U a spherical roller bearing with a split inner ring is known, which is braced with undivided, conical rings on a shaft. A disadvantage of this known embodiment is the complex assembly of the inner ring on the shaft, which is possible only by the supply of high pressure oil into a bore in one of the conical rings. In addition, an undivided standard stock can be replaced only at great expense by this technical solution, since the undivided clamping rings are not retrospective, that can not postpone without the previous expansion or pulling the bearing shaft on this. Object of the invention

The invention is therefore based on the object to propose a radially split radial roller bearing, which has a reduced Axialbaulänge compared to known embodiments.

Summary of the invention

The invention is based on the finding that the replacement of radial roller bearings is often very expensive because adjacent machine parts must be dismantled in advance in order to remove the bearing can. On the other hand, radially divisible radial rolling bearings can be assembled and disassembled faster, since the adjacent machine parts do not have to be removed for a bearing change, and in particular a prior extraction of the bearings to be stored Wave is eliminated. However, due to the need for separable bearings clamping rings these have in comparison to non-divisible bearings in the axial direction on an enlarged length. A shortening of the axial length is possible if the end clamping rings are arranged offset axially further to the center of the bearing and take over the function of inner ring rims.

The invention is therefore based on a radial roller bearing with rolling elements, which are accommodated in at least one cage and arranged between an inner ring and an outer ring, wherein the radial roller bearing is formed radially divisible, and in which the radially multi-part inner ring by means of two axially end to this attaching clamping rings can be mounted on a shaft. To achieve the object, it is provided that the inner ring is formed without a flange on the outside and the clamping rings assume the function of inner ring rims, wherein the rolling elements start in the axial direction against Innenanlaufflächen the clamping rings.

By this construction, the radial rolling bearing is advantageously shortened at least by the axial width of the two trained in the prior art inner ring rims. In addition, the manufacturing costs of a radial rolling bearing according to the invention are significantly lower than in the previous design, as can be saved by reducing the axial length of the inner ring and outer ring material for this, and also the manufacturing step for the production of inner ring rims is avoided. As a result, for example, an axially particularly short radial spherical roller bearings can be manufactured very inexpensively.

The fact that the clamping rings in the inventive design of the splittable Radialwäl- zager next to their actual basic function in the form of securing the inner ring on a shaft at the same time take over the task of axial Wälzkörperab support with, results over known two or more radially divided radial roller bearings a clear reduced axial length and increased functionality. The radial rolling bearing is therefore universally suitable for refitting and retrofitting and / or retrofitting machines. According to one embodiment of the invention can be provided that the at least one cage is axially outwardly guided on at least one clamping ring outer surface in the radial direction. Axially inside the at least one cage can be guided radially on a radially oriented surface of an Innringbords.

According to a further advantageous embodiment, it is provided that the inner contact surfaces of the clamping rings are aligned substantially parallel to the axially end-side outer contact surfaces of the respective associated rolling elements. The angle of attack ß the contact surface of the respective clamping ring to the longitudinal axis of the associated rolling elements is therefore about 90 °.

According to another embodiment of the invention it is provided that the clamping ring outer diameter is smaller than or equal to the inner diameter of the cage at its axially outer inner peripheral surface. By varying the tension ring outer diameter, the radial cage clearance can be precisely adjusted.

In addition, it can be provided that the longitudinal axes of each received in the at least one cage rolling elements are inclined by an angle α relative to a shaft longitudinal axis. In addition to the divisibility of the radial rolling bearing, the possibility of an angle compensation up to a few degrees between a bearing shaft and the inner ring or the outer ring of the radial rolling bearing is additionally given, which results in the functionality of a spherical roller bearing. This allows, inter alia, the use of the bearing in not completely aligned machine parts. At the same time, higher axial loads can be absorbed.

According to another development of the radial roller bearing, the clamping rings have a substantially rectangular cross-sectional geometry, and the width of the clamping rings is in each case dimensioned such that at least one connecting element, for example a screw bolt, can be introduced into the clamping rings. As a result, for example, two semicircular clamping ring segments, which together form a clamping ring, are tightened with the connecting elements on the inner ring and held together to fix the inner ring on the shaft. The approximately rectangular cross-sectional geometry simplified Here, the manufacturing process of the clamping rings of a metallic strip material with rectangular geometry.

According to a further advantageous embodiment, it is provided that the clamping rings are each received in a circumferential groove of the inner ring. This results after the assembly of the radial roller bearing a tight fit of the clamping rings on the shaft in the circumferential groove in the axial direction, whereby these are fixed against displacement and rotation on the shaft. According to another development of the radial rolling bearing is provided that the clamping rings axially on each of its inner peripheral surface each have a shoulder, in each of which a circumferential, radially outwardly directed projection of the inner ring engages at least partially. The protrusions of the inner ring, which engage in the preferably approximately rectangular shoulders, allow a clamping ring width which is greater in the axial direction than the width of the annular groove in the inner ring.

A further embodiment of the radial roller bearing provides that the inner ring and / or the outer ring have at least one bore for supplying a lubricant. The bore is preferably formed outside of connection zones of the segmented inner and outer rings.

Brief description of the drawings

The invention will be explained below with reference to the accompanying drawings in an embodiment. Therein, the single figure shows a schematic cross-sectional view of a double row spherical roller bearing.

DETAILED DESCRIPTION OF THE DRAWINGS The FIGURE shows a schematic cross-sectional representation through a radial roller bearing constructed according to the invention. The radial rolling bearing 10 is exemplified as a spherical roller bearing 12, which is substantially symmetrical to a shaft longitudinal axis 14 of a shaft 16 and a perpendicular thereto extending radial axis 18 is constructed. Due to the symmetry of the spherical roller bearing 12 each mirror images of each other formed components of the better graphical overview half are not consistently provided with two different reference numerals.

Between a radially separable inner ring 20 and a radially separable outer ring 22 a plurality of approximately barrel-shaped rolling elements 24 are arranged. The inner ring 20 and the outer ring 22 are here each formed from at least two half-shell-shaped segments, not shown, which are held together by means of clamping rings 36, 38 and guided by these connecting pin 48. This will be discussed in detail below.

The rolling elements 24 are arranged in two rows and each received in a cage 26, 28. The rolling elements 24 roll on two concave raceways 30, 32 of the inner ring 20 and a convex raceway 34 of the outer ring 22 from. The curvature of the rolling elements 24 corresponds to the curvatures of said slightly concave raceways 30 to 34.

The inner ring 20 of the spherical roller bearing 12 is secured by means of two clamping rings 36, 38 on the shaft 16. The two clamping rings 36, 38 each approximately have the geometric shape of a hollow cylinder of small length. The rolling elements 24 each have an axial bore through which a respective cage bolt 40, 42 is guided, so that the rolling elements 24 are rotatably mounted on these cage bolts 40, 42. The cage bolts 40, 42 are each inclined at an angle α with respect to the shaft longitudinal axis 14. Due to the approximately barrel-shaped or rolling elements 24 in conjunction with the concave or convex raceways 30, 32 34, the outer ring 22 and the inner ring 20 can be pivoted against each other during operation of the spherical roller bearing 12 by up to 5 ° from the position shown. Between the respective axially outer Außenanlaufflächen 46 of the rolling elements 24 and the longitudinal axis of the cage bolts 40, 42 is an angle ß of approximately 90 °. The clamping rings have axially inside each an inner contact surface 50 for the axially outer Außenanlaufflächen 46 of the respective rolling elements 24, wherein the Innenanlaufflächen 50 are formed inclined so that the Außenanlaufflächen 46 of the respective rolling elements 24 and the respectively associated Innenanlauffläche 50 on the clamping ring 36, 38 plane-parallel aligned with each other. By the parallel to the inclined inner contact surfaces 50 of the clamping rings 36, 38 extending outer contact surfaces 46 of the rolling elements 24, these are guided in the axial direction. The inclination of the respective inner contact surfaces 50 of the clamping rings 36, 38 with respect to the vertical axis 18 corresponds to approximately 5 °. Angle values in a range between 5 ° and 30 ° are also possible. The slightly inclined inner contact surfaces 50 are formed axially opposite to both clamping rings 36, 38 and in this case mirror-symmetrical to the vertical axis 18.

The radial guidance of the cages 26, 28 takes place axially outward also with the aid of the two clamping rings 36, 38. For this purpose, each clamping ring 36, 38 has a radially outwardly facing clamping ring outer surface 52. On the clamping ring outer surfaces 52, the cages 26, 28 are each received with their axially outer inner peripheral surface 54 easily movable. In order to achieve a defined cage guide play, the clamping ring outer diameter 56 is in each case smaller or equal to the diameter 58 of the cage 26, 28 on its axially outer inner peripheral surface 54. Axially inside, the inner ring 20 has a central Innenring- board 72, 74, on which the rolling elements 24 axially inside and the cages 28, 28 can be supported radially inward.

The clamping rings 36, 38 are received in a respective circumferential groove 60 of the inner ring 20. The axial width 62 of the clamping rings 36, 38 is in each case greater than a width 64 of the groove 60. The clamping rings 36, 38 have axially end each about circumferential shoulder 66, in each of which a circumferential, radially outwardly facing projection 68 of the inner ring 20 at least intervening in sections. The paragraphs 66 in the clamping rings 36, 38 make it possible to make the width 62 of the clamping rings 36, 38 largely independent of the width 64 of the circumferential groove 60. In the outer ring 22, a radial bore 70 is also introduced, via which, for example, a lubricant can be introduced into the bearing. Characterized in that the two clamping rings 36, 38 are positioned at least partially below the two cages 26, 28, the clamping rings 36, 38 in addition to their actual main function, namely to fix the inner ring 20 on the shaft 16, in addition, the cages 26, 28 in the radial Direction and also provide start-up surfaces for the rolling elements 24 in the axial direction.

In addition, this special positioning of the clamping rings 36, 38 reduces the axial length of the radial roller bearing 10 and the spherical roller bearing 12, making this especially as a universal replacement for older, not yet divisible radial roller bearings in the course of refurbishment, conversion and retrofitting measures can be used.

LIST OF REFERENCE NUMBERS

10 Radial rolling bearings 72 Central inner rinj

12 spherical roller bearings

14 shaft longitudinal axis

16 wave

18 radial axis

20 inner ring

22 outer ring

24 rolling elements

26 cage

28 cage

30 raceway on the inner ring

32 raceway on the inner ring

34 raceway on the outer ring

36 clamping ring

38 clamping ring

40 cage bolts

42 cage bolts

46 outer contact surface on the rolling element

48 connecting bolt, connecting element

50 inner contact surface on the clamping ring

52 tension ring outer surface

54 Axially outer inner peripheral surface of the cage

56 tension ring outer diameter

58 diameter of the cage at its axially outer inner peripheral surface 54th

60 groove on the inner ring

62 Width of the clamping ring

64 Width of the groove on the inner ring

66 paragraph on the clamping ring

68 projection on the inner ring

70 bore

Claims

claims

Radial rolling bearing (10) with rolling elements (24) which are received in at least one cage (26, 28) and between an inner ring (20) and an outer ring (22), wherein the radial rolling bearing (12) is formed radially divisible, and at in that the radially multi-part inner ring (20) can be fastened on a shaft (16) with the aid of two clamping rings (36, 38) axially attached to the latter, characterized in that the inner ring (20) is designed without a flange on the outside and the clamping rings ( 36, 38) assume the function of inner ring rims, wherein the rolling elements (24) in the axial direction against Innenanlaufflächen (50) of the clamping rings (36, 38) start.

Radial rolling bearing according to claim 1, characterized in that the at least one cage (26, 28) is guided axially outwardly on at least one clamping ring outer surface (52) in the radial direction.

Radial rolling bearing according to claim 1 or 2, characterized in that the inner contact surfaces (50) of the clamping rings (36, 38) are aligned substantially parallel to axial end-side outer contact surfaces (46) of the rolling elements (24).

Radial rolling bearing according to one of the preceding claims, characterized in that the Spannringaußendurchmesser (56) is less than or equal to the inner diameter (58) of the cage (26, 28) at its axially outer Innenumfangsfiäche (54).

Radial rolling bearing according to one of the preceding claims, characterized in that the longitudinal axis of the rolling bodies (24) is inclined by an angle α relative to a shaft longitudinal axis (14).

Radial rolling bearing according to one of the preceding claims, characterized in that the clamping rings (36, 38) have a substantially rectangular cross-sectional geometry, and that the axial width (62) of the clamping rings (36, 38) so be measure is that at least one connecting element (48) in the clamping rings (36, 38) can be introduced.

Radial rolling bearing according to one of the preceding claims, characterized in that the clamping rings (36, 38) in each case in an associated circumferential groove (60) of the inner ring (20) are accommodated.

Radial rolling bearing according to one of the preceding claims, characterized in that the clamping rings (36, 38) axially outside on their inner peripheral surface each have a shoulder (66), in each of which a circumferential, radially outwardly directed projection (68) of the inner ring (20). at least partially intervenes.

Radial rolling bearing according to one of the preceding claims, characterized in that the inner ring (20) and / or the outer ring (22) have at least one bore (70) for supplying a lubricant.

10. Radial rolling bearing according to one of the preceding claims, characterized in that this is designed as a spherical roller bearing.