DE102014203590A1 - biasing unit - Google Patents

Abstract

It is a biasing unit (1) disclosed comprising a first race (2) and a second race (5) arranged along an axis (50). The first race (2) and the second race (5) each have at least one raceway contour (8) for rolling bodies (3). By relative rotation of the first race (2) against the second race (5) at least one of the races (2, 5) along the axis (50) is displaceable. A between the first race (2) and the second race (5) arranged cage (4) for guiding and holding the rolling elements (3) is provided. The raceway contours (8) of the races (2, 5) are each formed as a continuous curved surface (8) in the respective race (2, 5). The continuous curved surfaces (8) each terminate at a lowest point (83) and at a highest point (85).

Description

The present invention relates to a biasing unit. In particular, the present invention relates to a biasing unit comprising a first race and a second race disposed along an axis, the races each having at least one raceway contour for rolling elements, and wherein at least one of the raceways is rotated relative to each other by relative rotation of the races Axis is displaceable, and wherein the biasing unit comprises a cage for guiding and holding the rolling elements, which is arranged between the races.

Background of the invention

Biasing units are known from the prior art, for example from the DE 10 2008 011 910 A1 . DE 10 2005 053 555 B3 . US 5,485,904 . US 5,620,072 . DE 19914937 A1 . DE 10 2011 083 047 A1 and DE 10 2012 202 456 A1 , Biasing units are used in transmissions of motor vehicles, in particular to enable the actuation of a friction clutch in the drive train of a final drive of a motor vehicle, in particular also for an all-wheel drive (coupler unit).

Other designations for bias unit are, for example, bias unit module, Axialverstelleinheit, clutch actuator, ball ramp unit or device for actuating a clutch.

Biasing units are used to shift elements in the axial direction, for example for switching a clutch. A biasing unit or an axial adjustment usually comprises at least two races, between which a plurality of rolling elements is arranged in a cage. The raceways for the rolling elements are usually designed as deep-drawn ramps in the races. This serves to support and support the rolling elements. If the discs are rotated against each other, the rolling elements run up the ramps and push the races apart. The races of such a bias unit are made of, for example, a sheet metal material. The races and the cage with the rolling elements of the biasing unit can be configured for example as angular contact ball bearings, such as from DE 10 2011 083 047 A1 . DE 10 2012 202 456 A1 and DE 10 2008 011 910 A1 known.

In the DE 10 2008 011 910 A1 discloses a bias unit, wherein a cage for receiving the rolling elements between two ramp discs (races) is arranged. The cage can be rotated against the two ramp discs. Ramp contours are formed on each ramp disc. Each ramp contour comprises two ramp levels, which are arranged at a bend angle and on which the rolling elements run guided during a Verdrehschwenkbewegung. The ramp contours, the rolling elements and the angle are adjusted so that at a certain maximum angle of rotation between the two ramp discs, the biasing unit in the direction of an axis reaches a maximum lifting movement. The ramp discs are solid components and thus have a relatively high weight. In addition, the bending angle can lead to jerky movements of the rolling element when it moves on the corresponding rim contour.

The design of the bearing can also be similar to that of some known release systems (clutch release systems), such as from the DE 199 14 937 A1 known.

Usually, the adjustment is made by machining, in particular, the ramp contours are milled into a massive plate or in a solid ring into it. Such adjustment units are complex and expensive to manufacture due to a higher material consumption.

An object of the present invention is therefore to provide a biasing unit, which is both stable, modular and reliable, as well as simple and inexpensive to produce.

This object is achieved by a biasing unit comprising the features of claim 1.

The biasing unit according to the invention comprises a first race and a second race, which are arranged along an axis. In this case, the axis represents the longitudinal and rotational axis of the biasing unit and its elements, in particular for all embodiments of the invention described below, even if this is not explicitly mentioned again at each point. The first race and the second race each have at least one raceway contour for rolling elements, usually per rolling element a raceway contour in each raceway. By relative rotation of the first race against the second race at least one of the races is slidable along the axis. If the races are rotated against each other, the rolling elements run up the raceway contours and push the races apart. The biasing unit according to the invention also comprises a cage for guiding and holding the rolling elements. The cage is disposed between the first race and the second race. According to the invention, the raceway contours of the races are each as one continuous curvy surface molded into the respective race. The respective continuous curvy surface ends at a lowest point and at a highest point.

The cage is usually arranged such drehrehschwenkbar between the first race and the second race about the axis that the two races are on the run along the raceway rolling elements in rolling contact.

In one embodiment of the biasing unit of the invention, the cage forms a ring which alternately consists of first ring segments and second ring segments. The rolling elements are each held between a first ring segment and a second ring segment. The ring segments are each formed as a continuous curved surface. The first ring segments are each inclined at an angle α to the axis and in the direction of the first race. The second ring segments are each inclined at an angle -α to the axis and in the direction of the second race. An advantage of this construction is that the cage is made very compact and material-saving and is adapted to the shape of the adjacent races, which also has a corresponding material and space-saving effect on the biasing unit. In addition, such a cage can be made in one piece and / or non-cutting.

In a preferred embodiment of the invention, the continuous curved surfaces of the races are each continuously differentiable, so have no kink or no sharp edge within the raceway contours, so that a safe smooth rolling of the rolling elements along the raceway contours without "jerkiness" is possible. The continuous curved ring segments of the cage can each be continuously differentiable. More preferably, the continuous curved surfaces of the races and / or the continuous curved ring segments of the cage are even each continuously differentiable continued in a respective adjacent surrounding area, which further improves the rolling behavior of the rolling elements.

In a further embodiment of the biasing unit according to the invention, the first raceway has a U, C or V profile in cross-section and track contours are embossed in an outer side of the U, C or V profile. The second race has a U-, C- or V-profile in cross-section and in an outer side of the U, C or V-profile also career contours are impressed, which correspond to the raceway contours of the first race. The respective U, C or V profiles of the two races can be shaped the same or different. Due to the flat design of the races in a very simple form, namely as a U, C or V-profile, the races in terms of the above task are stable, reliable, easy and inexpensive to produce. The flat output parts for the production of the races can be arbitrarily long and high. In addition, the edges or edges of the flat output parts for the races can be arbitrarily pulled up or down. Overall, therefore, a very variable configuration of the races with respect to their height, width and angle of the U, C or V-profiles is possible. The edge regions of the races are also correspondingly of simple form, so that any further rings and / or bearings can be connected to the edge regions of the races. The biasing unit with the races according to the invention thus enables a modular construction of further rings, discs, bearings and optionally further elements along the longitudinal and rotational axis of the biasing unit.

In a particular embodiment, the C-profile of the second race is a radial flange which communicates with the cage and the first race via the rolling elements. In addition, the second race has formed on its side facing away from the cage a sleeve which has a running toothing on its outer periphery. The running gear usually cooperates with a pinion plate to allow the relative displacement of the races to each other.

The races together with their molded-in raceway contours and / or the cage together with its ring segments are preferably in each case a stamped-stamped part or a stamped-die-stamped component or a bent component. In particular, these components can be produced by chipless forming, in particular by cold forming. In a particular embodiment, the raceway contours are milled without cutting into a solid plate or into a solid ring. In particular, the races and / or the cage can be made in one piece, in particular from a sheet metal part. Alternatively, the biasing unit may be made by machining. The first and second races can be manufactured in particular by the same manufacturing process, which is also cost-saving.

In a further preferred embodiment, the biasing unit according to the invention is an arrangement of other diverse disks, rings and bearings about the axis. Here, a connecting ring, a spring ring, a sealing ring or support ring, an outer bearing and a cover plate are arranged on the side facing away from the cage of the first race. At the side facing away from the cage of the second race a thrust bearing is arranged. Preferably, a support ring is still provided, which supports the thrust bearing in the radial direction.

The biasing unit according to the invention is thus stable, of modular construction and has a chipless design, which is simpler and less expensive compared to the prior art in the production.

The biasing unit according to the invention can be used as a ball ramp unit or Axialverstelleinheit to move elements in the axial direction or to switch, for example, for switching a clutch.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions in the figures do not always correspond to the actual size ratios, as some shapes are simplified and other shapes are shown enlarged in relation to other elements for ease of illustration. Showing:

1 an exploded perspective view of two races with embossed raceway contours and a cage therebetween according to an embodiment of the biasing unit according to the invention;

2 another perspective view of the two races with embossed raceway contours 1 in the assembled state;

3 a section in perspective view through the two races after 2 ;

4 a schematic radial cross section along the line AA in 1 for an embodiment of a first race, which has formed a U-shaped profile in cross section;

5 a schematic radial cross-section along the line DD in 1 for an embodiment of a second race, which has formed in cross-section a C-profile;

6 another schematic radial cross section along the line CC in 1 at a highest point of a track contour in the U-profile of the first race after 4 ;

7 another other schematic radial cross section along the line BB in 1 at a lowest point of the raceway contour in the U-profile of the first race after 4 and 6 ;

8th another schematic radial cross section along the line EE in 1 at a highest point of a track contour in the C-profile of the second race after 5 ;

9 another other schematic radial cross section along the line FF in 1 at a lowest point of the raceway contour in the C-profile of the second race after 5 and 8th ; and

10 a schematic cross section of an embodiment of the cage.

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 merely examples of the biasing unit according to the invention.

1 shows an exploded perspective view of two races 2 . 5 with embossed raceway contours 8th according to an embodiment of the biasing unit according to the invention 1 , The bias unit 1 includes a first race 2 and a second race 5 that go along an axis 50 are arranged. The first race 2 and the second race 5 each have at least one raceway contour 8th for rolling elements 3 on. By relative rotation of the first race 2 against the second race 5 is at least one of the races 2 . 5 along the axis 50 displaceable. The axis 50 represents the longitudinal and rotational axis of the biasing unit 1 and its elements.

A cage 4 for guiding and holding the rolling elements 3 is between the first race 2 and the second race 5 arranged. The raceway contours 8th the races 2 . 5 are each as a steady curvy surface 8th in the respective race 2 . 5 molded, with the continuous curvy surface 8th at a lowest point 83 and at a highest point 85 ends. The lowest point 83 and the highest point 85 So lie on opposite ends of the corresponding raceway contour 8th ,

The rolling elements 3 For example, they can be rollers or balls. It has been shown that it is particularly advantageous when between the races 2 and 5 at least three rolling elements 3 but not more than five rolling elements 3 are arranged distributed equally. The rolling elements 3 are arranged in this case at the same angular distance. By means of the rolling elements 3 is the first race 2 relative to the second race 5 to each other as possible without friction rotatable. Every rolling element 3 is in a holder or bag 17 of the cage 4 supported. In the races 2 and 5 are each corresponding career contours 8th formed, in which the rolling elements 3 roll. According to the invention, the raceway contours 8th continuously curvy, whereby a jerk-free rolling is possible, as already described above. Preferred and as in 1 are the continuous curved surfaces or career contours 8th the races 2 . 5 even each continuously differentiable, which is a particularly smooth and low-friction rolling of the rolling elements 3 and thus also a jerk-free and low-friction shifting of the two races 2 . 5 in the direction of the axis 50 causes.

By turning the races 2 and 5 relative to each other, the rolling elements roll 3 along the oblique track contours 8th , This causes a low-friction displacement or an axial stroke 74 (please refer 2 ) of the races 2 and 5 in the direction of the axis 50 , The shift happens until the axial stroke 74 has reached its maximum. The tangential force generated by the torsion moment on the two races 2 and 5 thus leads to an axial bias of the biasing unit 1 with a force in the axial direction. From the rolling elements 3 a normal force acts on the raceway contours 8th , With the displacement of the two races 2 and 5 is thus an axial stroke 74 in the direction of the axis 50 achievable, wherein the axial stroke 74 the axial distance between the races 2 . 5 certainly.

One of the races 2 or 5 For example, by means of a first multi-plate clutch (not shown) can be switched electromagnetically. For example, there is a second multi-plate clutch (not shown) between the transmission input shaft and the transmission output shaft. The biasing unit according to the invention 1 can be used in such a case in the bevel gear differentials for biasing the multi-plate clutches of the superposition stages.

The first race 2 is preferably a one-piece punch-stamped part, which is produced by cold forming.

It is of particular advantage if the two races 2 . 5 be produced as cold-formed components from a sheet metal blank. This will be the career contours 8th in the respective races 2 . 5 also imprinted. This embossing is also a cold forming process. As a material of the sheet metal blanks, cold-formable steel of the type "16MnCr5" has proven to be advantageous. Also of advantage as a material of the sheet metal blanks is a cold-forming steel of the type "C45", wherein the formed sheet metal blanks before the mechanical stress in the biasing unit 1 must be hardened. For a person skilled in the art, it goes without saying which hardening method is most suitable for this purpose.

In a preferred embodiment and as in 1 shown, has the first race 2 in cross-section a U-profile 81 (please refer 4 . 6 . 7 ), wherein in an outer side 811 of the U-profile 81 Career contours 8th are impressed. The second race 5 preferably has a C-profile in cross-section 82 (please refer 5 . 8th . 9 ), wherein in an outer side 821 of the C-profile 82 also career contours 8th are stamped with the raceway contours 8th of the first race 2 correspond.

In a further preferred embodiment and as in 1 to 3 . 8th and 9 represented, represents the C-profile 82 of the second race 5 a radial flange 18 that is with the cage 4 and the first race 2 over the rolling elements 3 communicated. It has the second race 5 at the cage 4 opposite side a sleeve 19 formed, the running gear at its outer periphery 20 which cooperates with a pinion disc to the relative displacement of the races 2 . 5 to enable each other. The radial flange 18 is preferably in one piece with the axially extending sleeve 19 connected. Alternatively, sleeve 19 and radial flange 18 interconnected components. The sleeve 19 is toothed for the torque-fixed but axially displaceable engagement with a shaft, not shown.

The second race 5 is optionally a die-stamping stamping component from a forged or sheet metal blank. Alternatively, the second race can 5 be pressed from the previously mentioned blanks.

In a further preferred embodiment and as in 1 and 10 represented, the cage forms 4 a ring alternating of first ring segments 13 and second ring segments 14 consists. Here are the rolling elements 3 each between a first ring segment 13 and a second ring segment 14 supported. The ring segments 13 . 14 are each formed as a continuous curvy surface. The first ring segments 13 are each at an angle α (see 10 ) to the axis 50 and in the direction of the first race 2 inclined. The second ring segments 14 are respectively at an angle -α to the axis 50 and in the direction of the second race 5 inclined. This embodiment of the cage 4 has the advantage that no plane radial disc for the cage 4 is required, as known from the prior art. The first and second ring segments 13 . 14 are thus each oblique to the axis 50 that is, the angle α is less than 90 degrees. The holders or bags 17 for guiding and holding the rolling elements 3 are respectively in this embodiment between a first ring segment 13 and an adjacent second ring segment 14 arranged. The bags 17 can be formed, for example, with a thermoforming process. The bags 17 may also have formed elastic supports in which the rolling elements 3 snap in (not shown).

For better support, in a further embodiment, preferably on the ring segments 13 . 14 each holding lugs or retaining lugs (not shown) formed at least with the first race 2 and the second race 5 cooperate for positive retention.

The cage 4 is preferably a bent sheet metal part or a drawing or punching bending member or a sheet metal. In the embodiment according to 1 are the ring segments 13 . 14 of the cage 4 always curvy and even always differentiable.

2 shows a different perspective view of the two races 2 . 5 with embossed raceway contours 8th to 1 in assembled condition. The one between the races 2 . 5 arranged cage 4 is in the illustration after 2 not visible or not shown for the sake of illustration.

As in 1 is described by the relative displacement of the races 2 . 5 to each other or away from each other an axial stroke 74 in the direction of the axis 50 achievable. When the two races 2 and 5 in such a position, the so-called neutral position, each other, that the rolling elements 3 at the lowest point 83 the raceway contour 8th is located as in 2 shown, occurs between the races 2 . 5 no axial stroke 74 one. For the sake of illustration, is in 2 but a certain distance between the races 2 . 5 and an axial stroke 74 shown as an arrow.

Usually the lowest point lies 83 a respective raceway contour 8th at one end of the raceway contour 8th and a highest point 85 lies at the other end of the raceway contour 8th ,

If, however, the first race 2 relative to the second race 5 is rotated against each other, thereby moving the rolling elements 3 on the raceway contour 8th from the lowest point 83 in one direction 84 to the highest point 85 on the raceway contour 8th , The rolling element rolls 3 according to the invention along the continuous curved surface of the raceway contour 8th , By twisting at least one of the races 2 and 5 relative to each other, thus posing an axial stroke 74 one. As mentioned above, the rolling elements 3 in the neutral position in the lowest point 83 between the opposing and corresponding raceway contours 8th each of the two races 2 and 5 , At relative rotation of the cage 4 and / or the first race 2 or the second race 5 between the opposing and corresponding raceway contours 8th to the end or the highest point 85 this, occurs a maximum Axialhub 74 on. The second race 5 thus raises axially (in the direction of the axis 50 ) and moves away to a maximum axial stroke 74 from the first race 2 ,

Otherwise, the elements are the 2 already described in the preceding description of the figures.

3 shows a section in perspective view through the two races 2 . 5 with embossed raceway contours 8th to 2 , The one between the races 2 . 5 arranged cage 4 is in the illustration after 3 also not visible. Otherwise, the elements are the 3 already described in the preceding description of the figures.

4 shows a schematic radial cross-section along the line AA in 1 for an embodiment of a first race 2 that has a U-profile in cross-section 81 has trained. In the area of the outside 811 of the selected cross section 4 are not career contours 8th embossed, so that the U-shape has no dents. Behind the U-profile 81 extends a first cavity 29 ,

5 shows a schematic radial cross section along the line DD in 1 for an embodiment of a second race 5 , which in cross-section is a C-profile 82 has trained. In the area of the outside 821 of the selected cross section 5 are not career contours 8th imprinted, so that the C-shape has no dents. Behind the C-profile 82 extends a second cavity 39 ,

6 shows another schematic radial cross-section along the line CC in 1 at a highest point 85 a raceway contour 8th in the U-profile 81 of the first race 2 to 4 , Allowing that in the area of the outside 811 of the selected cross section 6 a raceway contour 8th is impressed, is the U-shape of the U-profile 81 dented accordingly. The first cavity 29 For example, a deposit 291 for reinforcing and stabilizing the raceway contour 8th exhibit. 7 shows another other schematic radial cross section along the line BB in FIG 1 at a lowest point 83 the raceway contour 8th in the U-profile 81 of the first race 2 to 4 and 6 , The curvature of the raceway contour 8th changes constantly over the course of the raceway contour 8th between lowest point 83 and highest place 85 , which is at least schematic about the change of the distances d1 and d2 of 6 to 7 is indicated.

8th shows another schematic radial cross section along the line EE in 1 at the highest point 85 a raceway contour 8th in the C-profile 82 of the second race 5 to 5 , Characterized in that in the region of the outside of the selected cross section to 8th a raceway contour 8th is impressed, is the C-shape of the C-profile 82 dented accordingly. The second cavity 39 For example, a deposit 391 for reinforcing and stabilizing the raceway contour 8th exhibit. 9 shows another other schematic radial cross section along the line FF in 1 at a lowest point 83 the raceway contour 8th in the C-profile 82 of the second race 5 to 5 and 8th , Similar to the U-profile 81 of the first race 2 the curvature of the raceway contour changes 8th of the second race 5 also steadily over the course of the raceway contour 8th between lowest point 83 and highest place 85 , Otherwise, the elements are the 8th and 9 already described in the preceding description of the figures.

The first race 2 is usually coupled to a transmission input shaft (not shown). The second race 5 is usually coupled to a transmission output shaft (not shown), for example via an internal toothing (not shown) of the second race 5 , About the transmission output shaft is the second race 5 Usually connected to a rear axle of a motor vehicle (not shown). Turning the transmission input shaft and the transmission output shaft at different speeds (for example, when the rear wheels of the motor vehicle are on ice), the races rotate 2 and 5 the bias unit 1 relative to each other. The resulting normal force actuates a clutch (not shown). The torque can thus be transmitted from the transmission to the rear axle.

At the cage 4 opposite side of the second race 5 the bias unit 1 is in the assembled state of the biasing unit 1 For example, a thrust bearing (not shown) on the second race 5 at. The thrust bearing can along the axis 50 over the sleeve 19 of the second race 5 pushed and to the radial flange 18 of the second race 5 to be ordered.

To achieve safety against overload, it is advantageous if the rolling elements 3 between the first race 2 and the second race 5 on a first pitch k3 (see 3 ) are arranged. Likewise, the above-mentioned thrust bearing, which lies between the second race 5 and a thrust washer is disposed on a second pitch circle. The diameter of the pitch circle of the thrust bearing is less than or equal to the diameter of the pitch circle k3 on which the rolling elements 3 are arranged. If the diameters of the two pitch circles are different, there will be a stress on the tensioning unit between the two pitch circles 1 to a force deflection. This has the disadvantage that it leads to deformations and strong mechanical stresses of the races 2 . 5 can come. The axial force flow is thus not completely parallel to the axis 50 , Therefore, the diameters of the two pitch circles are preferably the same.

As already described above, the races are 2 . 5 in each case preferably a punching-embossing part or drawing-punching stamping component. In particular, the races can 2 . 5 each be a planar component, as in the embodiments 1 to 9 shown. The impression of the constantly flat raceway contours 8th in the respective race 2 . 5 is also easy to do. Because the career contours 8th for increasing or decreasing the axial stroke 74 are stamped curve-shaped, the races must 2 respectively. 5 each have a corresponding minimum width and minimum height. Behind the raceway contours 8th , so away from the rolling elements 3 , no material is required, so the races 2 respectively. 5 corresponding cavities 29 respectively. 39 behind the raceway contours 8th have formed, as already described above. Overall, this embodiment has the advantage that the races 2 . 5 each have a low weight and are easily malleable and compact, which in turn corresponding to the total weight of the biasing unit 1 reduces and improves their compactness. In addition, such a bias unit 1 modular and thus flexible use, as already described in detail above. In contrast, in the prior art, for example according to the DE 10 2008 011 910 A1 , given only continuous, but not continuously differentiable ramp levels in massive races of complex design.

10 shows a schematic cross section of an embodiment of the cage 4 as already at 1 described. As already described above, the first ring segments 13 are each at an angle α to the axis 50 and in the direction of the first race 2 inclined, and the second ring segments 14 are respectively at an angle -α to the axis 50 and in the direction of the second race 5 inclined. By way of illustration, the two ring segments 13 . 14 in the foreground with a thicker stroke and the two ring segments 13 . 14 Drawn in the background with a thinner stroke. As also described above, this embodiment of the cage 4 the advantage that no flat radial disc for the cage 4 necessary is the cage 4 thus compact and lightweight.

The invention has been described with reference to a preferred embodiment. It is obvious to a person skilled in the art that changes and deviations of the invention can be made without losing the scope of protection of the invention to leave the following claims. In particular, other numbers and / or other forms of rolling elements 3 can be used without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

 biasing unit

2

 first race

3

 rolling elements

4

 Cage

5

 second race

5a

 edge

8th

 Track contour (continuous curvy surface)

81

 U, C or V profile

811

 outside

82

 U, C or V profile

821

 outside

83

 lowest point

84

 Direction of movement of the rolling element

85

 highest point

13

 first ring segment

14

 second ring segment

17

 Holder (bag)

18

 radial flange

19

 Sleeve (neck)

20

 running gear

29

 first cavity

291

 deposit

39

 second cavity

391

 deposit

50

 axis

74

 axial stroke

α

 angle

d1

 distance

d2

 distance

k3

 first circle

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 102008011910 A1 [0002, 0004, 0005, 0058]
• DE 102005053555 B3 [0002]
• US 5485904 [0002]
• US 5620072 [0002]
• DE 19914937 A1 [0002, 0006]
• DE 102011083047 A1 [0002, 0004]
• DE 102012202456 A1 [0002, 0004]

Claims (7)

Bias unit ( 1 ) comprising a first race ( 2 ) and a second race ( 5 ) along an axis ( 50 ) are arranged, wherein the first race ( 2 ) and the second race ( 5 ) at least one raceway contour ( 8th ) for rolling elements ( 3 ), and wherein by relative rotation of the first raceway ( 2 ) against the second race ( 5 ) at least one of the races ( 2 . 5 ) along the axis ( 50 ) and a cage ( 4 ) for guiding and holding the rolling elements ( 3 ), which is between the first race ( 2 ) and the second race ( 5 ), characterized in that the raceway contours ( 8th ) of the races ( 2 . 5 ) each as a continuous curvy surface ( 8th ) in the respective race ( 2 . 5 ) are formed, wherein the continuous curvy surface ( 8th ) at a lowest point ( 83 ) and at a highest point ( 85 ) ends. Bias unit ( 1 ) according to claim 1, wherein the cage ( 4 ) forms a ring which alternately consists of first ring segments ( 13 ) and second ring segments ( 14 ), wherein the rolling elements ( 3 ) each between a first ring segment ( 13 ) and a second ring segment ( 14 ), the ring segments ( 13 . 14 ) are each formed as a continuous curved surface, and the first ring segments ( 13 ) each at an angle (α) to the axis ( 50 ) and in the direction of the first race ( 2 ) are inclined and the second ring segments ( 14 ) each at an angle (-α) to the axis ( 50 ) and in the direction of the second race ( 5 ) are inclined. Bias unit ( 1 ) according to one of the preceding claims, wherein the continuous curved surfaces ( 8th ) of the races ( 2 . 5 ) and / or the continuous curvy ring segments ( 13 . 14 ) of the cage ( 4 ) are each continuously differentiable. Bias unit ( 1 ) according to one of the preceding claims, wherein the first race ( 2 ) in cross section a U, C or V profile ( 81 ), wherein in an outer side ( 811 ) of the U, C or V profile ( 81 ) Career contours ( 8th ) are impressed, and wherein the second race ( 5 ) in cross section a U, C or V profile ( 82 ), wherein in an outer side ( 821 ) of the U, C or V profile ( 82 ) Career contours ( 8th ) are imprinted. Bias unit ( 1 ) according to claim 4, wherein the U, C or V profile ( 82 ) of the second race ( 5 ) a radial flange ( 18 ), with the cage ( 4 ) and the first race ( 2 ) over the rolling elements ( 3 ), and wherein the second race ( 5 ) at the cage ( 4 ) facing away from a sleeve ( 19 ) has formed, which on its outer periphery a running toothing ( 20 ) having. Bias unit ( 1 ) according to one of the preceding claims, wherein the races ( 2 . 5 ) together with their molded-in raceway contours ( 8th ) and / or the cage ( 4 ) together with its ring segments ( 13 . 14 ) are in each case a stamped-stamped part or a die-punched stamping component or a bending component, which are produced in particular by chipless forming, in particular by cold forming. Bias unit ( 1 ) according to claim 6, wherein the races ( 2 . 5 ) and / or the cage ( 4 ) are each made in one piece, in particular of a sheet metal part.

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