DE102014219702A1 - Raceway structure for a rolling bearing and method - Google Patents

Abstract

Embodiments relate to a raceway structure 100 for a rolling bearing. The raceway structure 100 includes a raceway 110 of a bearing ring 120 and a rolling element 130. In an idle state, the rolling element 130 abuts a first point of contact 140-1 and a second point of contact 140-2 spaced axially of the first point of contact 140-1 with the track 110. A connecting line 150 between the first and second touch points 140-1; 140-2 includes a point 160, in which the track 110 is arranged at a predefined distance 170 to the rolling body 130.

Description

Present embodiments are in the field of raceway structures for rolling bearings.

In many areas of technology rolling bearings are used, which may be exposed to more or less strong forces. When such a force acts, it can be transmitted, for example, from an outer ring via a rolling element to an inner ring. It may happen that due to the load increased wear occurs in a raceway of the bearing rings or a rolling surface of the rolling body. This in turn can lead to a shorter life of the bearing, and thus additional maintenance processes, which in turn can cause increased costs or material costs.

In order to achieve a reduced frictional torque in a tapered roller bearing can be used according to a conventional solution with an increased crown (or in other words a convex profile) of the raceways. Although this procedure can reduce the rolling friction, it can also mean that the roller in the bearing can only roll off less stably. This can easily result in undesired misalignments with increased friction at the guide board.

In conventional tapered roller bearings, which tend due to the increased crown of the raceways in some operating conditions for rotating the roller, the friction on the guide board can be increased. For less crowned track profiles such as e.g. the logarithmic profile may mitigate this behavior. However, this design of the raceway profile may possibly cause a more stable run of the roller with an increased contact length and thus with a higher friction torque of the bearing .. A load-technical design of individual bearing components may thus be used only with reduced efficiency.

It is therefore desirable to provide an improved compromise of reduced frictional torque of the bearing and running stability during operation of a rolling bearing.

These requirements are taken into account by a raceway structure for a roller bearing and a method according to the independent patent claims.

According to a first aspect, embodiments relate to a raceway structure for a rolling bearing. The raceway structure includes a raceway of a bearing ring and a rolling element. In an idle state, the rolling element is in contact with the raceway at a first point of contact and at a second point of contact spaced apart in the axial direction from the first point of contact. A connecting straight line between the first and second contact points in this case comprises a point at which the raceway is arranged at a predefined distance from the rolling body. This makes it possible to reduce a friction below a predetermined load limit, whereby wear and thus possibly additional maintenance processes can be omitted. Also, this may possibly cause a more stable running behavior of the rolling elements on the track. Tilting of the rolling element can thereby be unlikely, and thus possibly resulting damage to the bearing can be reduced or even prevented.

In some embodiments, the rolling element and the raceway have substantially different radii of curvature. This can reduce a contact area and thus reduce friction.

In some embodiments, an axial cross-sectional profile of the raceway has a concave curvature. In this way, at least two points of contact can be present, and thereby a geometry are made possible, which makes it difficult to prevent rotation of a rotational axis of the rolling body or even prevented.

In some embodiments, an axial cross-sectional profile of the rolling element has a concave curvature. Thus, an additional or alternative possibility can be created to reduce friction between the rolling element and raceway.

In some embodiments, a material of the rolling element has a higher degree of hardness than a material of the raceway. This can cause a deformation of a rolling element above a certain load limit against deformation of the track is reduced, which could lead to a higher life of the rolling elements.

In some embodiments, the track is limited in the axial direction by a guide board for guiding the rolling body. Thereby, the possibility of an inclination of the rolling element can be further reduced.

In some embodiments, the raceway structure further includes a mating race of a mating ring. In a rest state, the rolling element is in contact with the mating track at a third point of contact. An axially extending straight line intersecting the third point of contact comprises a first region on one side of the third point of contact and a second area on a side facing away from the side of the third point of contact. In this case, the rolling elements at the first and the second region is spaced from the mating track. Thus, possibly a load range can be further reduced, and thereby a more stable running of the rolling element can be achieved.

Some embodiments relate to a tapered roller bearing with a said raceway structure. This may make it possible to reduce wear during operation of a tapered roller bearing.

In another aspect, embodiments relate to a method for a raceway structure in a rolling bearing. The method comprises arranging a rolling body in contact with a raceway in such a way that, in a rest state, the rolling body is in contact with the raceway at a first contact point and at a second contact point spaced apart in the axial direction from the first contact point. In this case, a connecting straight line between the first and second contact point comprises a point at which the raceway is arranged at a predefined distance from the rolling body. Friction below a predetermined load limit can be reduced so that wear and thus possibly additional maintenance processes can be omitted. Also, this may possibly cause a more stable running behavior of the rolling elements on the track. A probability of tilting and thereby possibly resulting damage to the bearing can be reduced or even prevented.

In still another aspect, embodiments relate to a method of manufacturing a raceway structure in a rolling bearing. The method includes providing a bearing race with a raceway. The method also includes creating a concavity in a profile of the track. The method further comprises arranging the raceway and a rolling element in such a way that, in a rest state, the rolling elements are in contact with the raceway at a first contact point and at a second contact point spaced apart in the axial direction from the first contact point. In this case, a connecting straight line between the first and second contact point comprises a point at which the raceway is arranged at a predefined distance from the rolling body. This can increase a more stable running of the rolling element on the track.

Further advantageous embodiments will be described in more detail below with reference to exemplary embodiments illustrated in the drawings, to which exemplary embodiments are not restricted. They show in detail:

1 a raceway structure according to an embodiment;

2 a raceway structure comprised of a tapered roller bearing according to an embodiment; and

3 a method for producing a raceway structure in a rolling bearing according to an embodiment.

In the following description of the accompanying drawings, like reference characters designate like or similar components. Further, summary reference numbers are used for components and objects that occur multiple times in one embodiment or in one representation, but are described together in terms of one or more features. Components or objects which are described by the same or by the same reference numerals may be the same, but possibly also different, in terms of individual, several or all features, for example their dimensions, unless otherwise explicitly or implicitly stated in the description.

1 shows an embodiment of a raceway structure 100 for a rolling bearing. For reasons of clarity, dimensions of individual components or dimensions may be exaggerated in the following figures. The track structure includes a track 110 a bearing ring 120 and a rolling element 130 , In a resting state of the rolling elements 130 at a first point of contact 140-1 and at an axial direction to the first point of contact 140-1 spaced second point of contact 140-2 in contact with the track 110 , A connecting line 150 between the first and second touch points 140-1 ; 140-2 includes a point 160 in which the career 110 at a predefined distance 170 to the rolling element 130 is arranged. As a result, under certain circumstances, a tilt-free running of the rolling element 130 or role.

The career structure 100 may be covered by a rolling bearing. The rolling bearing can in this case, for example, as in 1 shown, be a tapered roller bearing, or other storage type, such as cylindrical roller, barrel roller or needle roller bearings, and may also be formed one, two or more rows. The resting state may be a stress-free state or an unloaded state of a structure, which the rolling bearing with the raceway structure 100 includes, correspond. The bearing ring 120 can be an inner ring or outer ring. The rolling element 130 here has one, of a spherical shape deviating, rotationally symmetrical along an axis shape. The distance 170 at the point 160 on the connecting straight 150 can be understood, for example, in the sense that a vertical 180 which the connecting line 150 at right angles to the point 160 cuts the distance 170 includes. The connecting line 150 , the vertical 180 and a central axis 190 (or symmetry or rotation axis of a raceway structure 100 comprehensive camp) lie in a common plane. at 1 becomes the distance 170 in a radial direction through the point 160 limited. In other embodiments, the distance 170 the point 160 include or exclude. For the sake of clarity, the distance is 170 in 1 exaggerated. A relationship between the distance 170 and a diameter of the rolling element 130 For example, in some embodiments, it may be between 1: 1000 and 1: 100000.

Through the points of contact 140-1 ; 140-2 Thus, a more stable support position for the rolling elements 130 come about. A rotation of a rotation axis of the rolling body 130 can thus be avoided more easily.

In some embodiments, the rolling element 130 and the career 110 essentially different radii of curvature. Essentially, this may mean that a difference between the radii of curvature is at least 1 percent, 2 percent or 5 percent. In another embodiment, rolling elements 130 and career 110 be formed concave to each other at the same radius of curvature. Alternatively, a profile of a curvature profile of the rolling body 130 or the career path 110 deviate from a circular shape, and follow, for example, a course of a logarithmic, exponential, parabolic, ellipsoidal or hyperbolic curve.

Optionally has an axial cross-sectional profile of the raceway 110 a concave curvature on. In this case, a cross-sectional profile of the rolling element 130 also concave, straight, or even with a larger radius of curvature than the track 110 be convex.

Likewise, an axial cross-sectional profile of the rolling element 130 optionally a concave curvature. In this case, a cross-sectional profile of the career 110 also concave, straight, or even with a larger radius of curvature than the rolling elements 130 be convex.

In the above embodiments, the rolling element 130 as long as a load on a the track structure 100 comprehensive bearing is below a predetermined limit, at the at least two points of contact 140-1 ; 140-2 with the career 130 in plant. As the load increases, a deforming force can be applied to the rolling element 130 or the career path 110 which effect a reduction of the distance 150 can result. If the load exceeds the specified limit, the distance can be exceeded 150 be reduced to zero, and the rolling elements 130 along a distance between the points of contact 140-1 ; 140-2 be brought into contact with the career. In this way, as an enlarged bearing surface can be created, which can improve power transmission, and a load of the bearing can be further increased. A reduction of the load on the bearing can in turn reduce the deformation and increase the distance 150 cause.

In some embodiments, a material of the rolling element 130 a higher degree of hardness than a material of the raceway 110 , In this case, for example, a degree of hardness of the rolling element 130 over 50 HRC (Rockwell hardness) and a hardness grade of the raceway 110 less than 50 HRC. As a result, if necessary, a deformation can be distributed in a controlled manner to the individual components, which, for example, causes excessive wear on the rolling element 130 can reduce.

In some embodiments, the raceway structure may be 100 be covered by a rolling bearing. 2 shows such a rolling bearing, which as a tapered roller bearing 200 is executed, with the raceway structure 100 , The tapered roller bearing 200 further includes a mating ring 210 with a mating track 220 , The mating ring 210 can be designed as an inner or outer ring. at 2 is the bearing ring 120 an inner ring, and the mating ring 210 an outer ring. The tapered roller bearing 200 further comprises a cage 230 for receiving the rolling element 130 and further rolling elements. In addition, a gasket carrier plate 240 on the mating ring 210 firmly mounted, and a sealing lip 250 such on the seal carrier plate 240 attached in sliding contact with the bearing ring 120 stands. By the in 2 shown arrangement of the bearing ring 120 , the counter ring 210 and the rolling element 130 To each other, a power transmission in the tapered roller bearing 200 along a radially and axially extending force direction 280 be enabled.

In some embodiments, the career is 110 in the axial direction by a guide board 260-1 ; 260-2 limited to guiding the rolling body. It can, for example, one-sided, but also how 2 shows, on both sides of the track 120 a guide board 260-1 ; 260-2 be arranged, such as in a cylindrical roller bearing. Both sides of the track 120 can be located, such as in cylindrical roller bearings (CRBs) in the context of Manufacturing tolerances be the same size as already in 1 shown. 2 shows different sized guide rims. In this case, a smaller of the guide rims can cause a holding of the rollers taking into account a margin, and thus counteract a falling apart of the bearing. A larger of the guide rims can also cause a support of the rollers. This can be an improved guidance of the rolling element 130 allow, and a risk of twisting of the rolling element 130 further reduce. As a result, under certain circumstances can wear through an edge of the rolling element 130 , which a bearing surface of the rolling element 130 delimited from the side surface, on the track 110 be reduced. The career 120 also has in one to the guide board 260-1 ; 260-2 adjacent area along a circumferential direction recess 270-1 ; 270-2 on. The puncture 270-1 ; 270-2 may be due to manufacturing technology.

In some embodiments, the raceway structure includes 100 furthermore, the mating track 220 of the counter ring 210 , In a resting state of the rolling elements 130 at a third point of contact in mating with the mating track 220 , An axially extending straight line intersecting the third contact point comprises a first region on one side of the third contact point and a second region on a side of the third contact point remote from the side. In this case, the rolling elements in the first and the second region to the mating track 220 spaced. In other words, the career 110 with respect to the rolling element 130 have a concave, and the mating track 220 to the rolling element 130 arched out. Thus, the rolling element 130 in a resting position at, for example, three points with the track 110 or the mating track 220 in plant. Again, in other words, a hollow ground, but wide raceway profile on the bearing ring 120 and a spherical raceway profile on the opposite mating ring 210 to be available. The convex or convex track profile can follow a logarithmic course, for example. This may possibly reduce a bearing component and at the same time a more stable run of the rolling element 130 to reach.

In another aspect, embodiments relate to a method for a raceway structure in a rolling bearing. The method comprises arranging a rolling body in contact with a raceway in such a way that, in a rest state, the rolling body is in contact with the raceway at a first contact point and at a second contact point spaced apart in the axial direction from the first contact point. In this case, a connecting straight line between the first and second contact point comprises a point at which the raceway is arranged at a predefined distance from the rolling body. Friction below a predetermined load limit can thus be reduced, whereby bearing friction (proportional to the roller raceway contact surface) can be reduced. At high loads, an overload of the bearing can be avoided, and possibly a full career contact surface are available. Also, a cabinet of the rollers can be reduced in the unloaded state, which can reduce the wear between an upper edge of the guide board and an outer edge of the roller bearing surface to the guide board. Also, this may possibly cause a more stable running behavior of the rolling elements on the track. A probability of tilting and thereby possibly resulting damage to the bearing can be reduced or even prevented.

According to yet another aspect, embodiments relate to a method ( 300 ) for producing a raceway structure in a rolling bearing. The procedure ( 300 ) comprises providing ( 310 ) of a bearing ring with a track. The procedure ( 300 ) also includes manufacturing ( 320 ) of a concavity in a profile of the career. The procedure ( 300 ) further comprises arranging ( 330 ) of the raceway and a rolling element such that in a resting state of the rolling elements at a first contact point and at a spaced apart in the axial direction to the first contact point second contact point is in contact with the raceway. In this case, a connecting straight line between the first and second contact point comprises a point at which the raceway is arranged at a predefined distance from the rolling body. This can increase a more stable running of the rolling element on the track.

The raceway profile used in embodiments can achieve a possibly friction-reducing effect. In this case, a logarithmic inner raceway (or outer raceway) can be used, which can allow improved stability of the rolling element or the roll against tilting. Furthermore, embodiments refer to a, for example, at least 1 micron or up to 10 microns hollow track in an arranged between two points of contact region of the support surface of the roller, for example when used in a truck.

Correspondingly, a dimensioning of the distance between the rolling element and the raceway can be greater for large bearings or smaller for correspondingly smaller bearings. At a load above a predefined limit value, a deformation of the raceway may cause the lowered raceway area to wear and possibly prevent an overloading of the bearing.

The embodiments described above are merely illustrative of the principles of the present invention. It will be understood that modifications and variations of the arrangements and details described herein will be apparent to others of ordinary skill in the art. Therefore, it is intended that the invention be limited only by the scope of the appended claims and not by the specific details presented in the description and explanation of the embodiments herein.

The features disclosed in the foregoing description, the appended claims and the appended figures may be taken to be and effect both individually and in any combination for the realization of an embodiment in its various forms.

LIST OF REFERENCE NUMBERS

100

 Career structure

110

 career

120

 bearing ring

130

 rolling elements

140-1

 First point of contact

140-2

 Second touchpoint

150

 connecting line

160

 Point

170

 distance

180

 vertical

190

 central axis

200

 Tapered roller bearings

210

 counter ring

220

 Mating track

230

 Cage

240

 Seal carrier plate

250

 poetry

260-1; 260-2

 management board

270-1; 270-2

 puncture

280

 direction of force

300

 method

310

 Provide

320

 Produce

330

 arrange

Claims (10)

Career structure ( 100 ) for a rolling bearing, comprising a raceway ( 110 ) of a bearing ring ( 120 ) and a rolling element ( 130 ), wherein in a resting state of the rolling elements ( 130 ) at a first touch point ( 140-1 ) and at an axial direction to the first point of contact ( 140-1 ) spaced second point of contact ( 140-2 ) in contact with the track ( 110 ), and wherein a connecting line ( 150 ) between the first and second touch points ( 140-1 ; 140-2 ) one point ( 160 ) in which the track ( 110 ) at a predefined distance ( 170 ) to the rolling element ( 130 ) is arranged. Career structure ( 100 ) according to claim 1, wherein the rolling element ( 130 ) and the career path ( 110 ) have substantially different radii of curvature. Career structure ( 100 ) according to one of the preceding claims, wherein an axial cross-sectional profile of the raceway ( 110 ) has a concave curvature. Career structure ( 100 ) according to one of the preceding claims, wherein an axial cross-sectional profile of the rolling body ( 130 ) has a concave curvature. Career structure ( 100 ) according to one of the preceding claims, wherein a material of the rolling element ( 130 ) has a higher degree of hardness than a material of the track ( 110 ). Career structure ( 100 ) according to one of the preceding claims, wherein the track ( 110 ) in the axial direction by a guide board ( 260-1 ; 260-2 ) for guiding the rolling element ( 130 ) is limited. Career structure ( 100 ) according to one of the preceding claims, wherein the raceway structure ( 100 ) also a mating track ( 220 ) of a counter ring ( 210 ), wherein in a resting state of the rolling elements ( 130 ) at a third point of contact in mating with the mating track ( 220 ), and wherein an axially extending straight line intersecting the third contact point comprises a first region on one side of the third contact point and a second region on a side of the third contact point remote from the side, the rolling body ( 130 ) at the first and second areas to the mating track ( 220 ) is spaced. Tapered roller bearings ( 200 ) with a raceway structure ( 100 ) according to one of the preceding claims. A method for a raceway structure in a rolling bearing, comprising: arranging a rolling element in contact with a raceway such that in a resting state the rolling elements are in contact with the raceway at a first contact point and at a second contact point spaced axially from the first contact point, and where one Connecting straight line between the first and second touch point comprises a point at which the raceway is arranged at a predefined distance to the rolling body. Procedure ( 300 ) for producing a raceway structure in a rolling bearing, comprising: providing ( 310 ) of a bearing ring with a raceway; Produce ( 320 ) a concavity in a profile of the raceway; and arranging ( 330 ) of the raceway and a rolling element such that in a resting state, the rolling elements at a first contact point and at a second contact point spaced in the axial direction to the first contact point in contact with the raceway, wherein a connecting line between the first and second contact point comprises a point in which the track is arranged at a predefined distance to the rolling body.

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