Bearing device and linear adjustment device

Abstract

A bearing device and a linear adjustment device, the bearing device having: a rotation-translation converter (28) comprising an axially positionally fixed, rotating first member and a second member axially movable by rotation of the first member; the utility model relates to a needle roller bearing, in particular a needle roller bearing, comprising a support member and an axial bearing (1), via which a rotating first member is supported on the support member, the axial bearing (1) being a needle roller bearing with only one cage (2), the cage (2) having a plurality of first pockets (5) laid with needle rollers and a plurality of second pockets (6) separate from the first pockets (5) laid with needle rollers, the second pockets (6) being spaced apart from the first pockets (5) and the second pockets (6) being spaced apart from the first pockets (5) and the second pockets (6) being spaced apart from the first pockets (5). The first pocket has a first base circle diameter (F1) and the second pocket has a second base circle diameter (F2), where the second base circle diameter (F2) is greater than the first base circle diameter (F1).

Description

Technical Field

[0001] The utility model relates to a bearing device, which comprises: a rotation-translation converter, which comprises a first rotating component with a fixed axial position and a second component that can move axially through the rotation of the first component; a supporting component and an axial bearing, wherein the rotating first component is supported on the supporting component via the axial bearing. Background Art

[0002] Such bearing arrangements are used wherever controlled linear adjustment movements are to be generated with the aid of a rotational-translational converter driven by an actuator. For example, such bearing arrangements can be used in motor vehicle braking systems, such as electromechanical parking brakes or electromechanical service brakes, such as caliper brakes or drum brakes. The bearing arrangement comprises a rotational-translational converter consisting of an axially fixed, yet rotatable, first component and a linearly movable, rotationally fixed second component, coupled to the first component and axially displaceable by rotation of the first component. The element to be adjusted, such as a brake pad in a braking system, is coupled directly or indirectly to the second component. The rotating first component is driven by an electromechanical actuator, typically an electric motor, and optionally via an interposed transmission. Depending on the direction of rotation of the first component, the second component can be moved axially in two specific directions, enabling reversible adjustment operations. The rotational-translational converter can, for example, be a ball screw drive consisting of a spindle, a nut, and balls accommodated between the spindle and the nut. Here, the spindle can either be rotated by the actuator and represent the first component, while the nut moves along the spindle and represents the second component. Alternatively, the nut can also be actively rotated and form the first component, while the spindle is moved axially by the nut. In either case, the rotating, but axially fixed, component must be axially supported on the surrounding structure, i.e., the supporting component, by means of an axial bearing in order to thereby support the axial forces acting during the adjustment operation or to direct these axial forces into the surrounding structure.

[0003] An axial bearing is known from DE 10 2015 201 487 A1, in which needle rollers are provided as rolling elements, wherein the bearing consists of two separate, concentrically arranged cages. Utility Model Content

[0004] The object of the present invention is to provide an improved bearing arrangement.

[0005] In order to achieve the above object, according to the present invention, the axial bearing is a needle roller bearing having only one retaining cage, wherein the retaining cage has a plurality of first pockets provided with needle rollers and a plurality of second pockets separated from the first pockets and provided with needle rollers, wherein the first pockets have a first bottom circle diameter, and the second pockets have a second bottom circle diameter, wherein the second bottom circle diameter is larger than the first bottom circle diameter.

[0006] The bearing arrangement according to the present invention offers numerous advantages over previously known designs, particularly suitable for the described application in purely electromechanical vehicle brakes or combined vehicle brakes with hydraulically actuated service brakes and electromechanically actuated parking brake systems (so-called parking brakes). On the one hand, shorter rolling elements are used, which reduces friction. On the other hand, the double-row arrangement of needle rollers in the needle roller rings, which are located on different pitch circles and each have a plurality of individual needle rollers offset in the circumferential direction, significantly increases and can also be varied. The use of a single-piece cage is particularly advantageous both for manufacturing and assembly, as it allows for significantly more stable designs of the cage or bearing. This also results in simpler manufacturing and lower material requirements. The use of a single-piece cage also offers significant space advantages with respect to the radial bearing width, as the individual needle roller rings can be positioned as optimally and closely as possible relative to one another, viewed radially. The use of corresponding needle rollers also results in a significantly shorter axial width compared to axial ball bearings. Furthermore, it is possible to use needle rollers of different lengths, not just the same length, i.e., for example, a first, shorter needle roller in the radially inner needle roller ring and a second, longer needle roller in the radially outer needle roller ring. In principle, given different deformations of the environment or components that are to support each other under load, it is also possible to use not just the same needle rollers, but rather different needle roller assortments for each needle roller ring. This is advantageous because, if geometric changes occur with respect to the supported components, which lead to disc deformation under correspondingly high loads on the cage, this allows for uniform compression of the different needle roller rows, which is beneficial for the service life of the axial bearing.

[0007] The bearing arrangement according to the present invention has an axial bearing with only one annular cage, but the cage is provided with first and second pockets with corresponding needle rollers, located on different pitch circles. Consequently, there are two independent pocket rings or needle roller rings, each with pockets or needle rollers offset in the circumferential direction, but located on different pitch circles. The first pocket, viewed radially more inward, has a first base diameter that defines the radially inner end of the pocket. The second pocket, viewed radially more outward, has a second base diameter that is larger than the first base diameter; that is, the pocket ring is positioned radially further outward. Only one needle roller is arranged in each pocket. The outer needle roller ring can have more pockets than the inner needle roller ring and can therefore accommodate more needle rollers. It is thus possible to accommodate more load-bearing rolling elements in the same installation space than in a single-row needle roller ring, thereby increasing the load-bearing capacity or reducing the contact pressure under the same load, which leads to a longer service life, lower friction and better efficiency.

[0008] Compared to axial bearings consisting of two separate, concentrically arranged cages, a one-piece cage also enables a narrower and more compact cage design, viewed radially. This is because the two individual cages are provided with corresponding edge-side edges of a specific geometry that engage from behind in the installed position. The axial bearing used according to the present invention does not require this edge geometry, as in double-row needle roller bearings. A web, which can be kept very narrow, remains between the inner and outer pocket rings. Compared to axial bearings consisting of two cages, the axial bearing according to the present invention can be designed radially shorter than an axial bearing with two separate cages under similar loads. Compared to an axial bearing with two cages, with the same radial length, it is possible to design the pockets, and therefore the needle rollers, longer, which in turn increases the load capacity. However, because the pockets, and therefore the needle rollers, are also significantly shorter than in a single-row axial bearing, the bearing according to the present invention also exhibits significantly lower friction.

[0009] The shorter pockets also improve the stability of the cage in the pocket area because, unlike in single-row cages, there is virtually no twisting under load that could affect the guidance of the needle rollers in the pockets. Long needle rollers are used in single-row axial bearings to achieve the required load-bearing capacity. Therefore, the pockets should also be correspondingly long. Compared to such single-row axial bearings, the pocket and needle roller dimensions in the axial bearing used according to the present invention are smaller, and circumferential webs remain between the pocket rings to stabilize the cage and pockets.

[0010] Manufacturing is also significantly simpler because a one-piece cage is used in which all pockets can be formed in a common stamping or forming step. Less hole waste is generated during stamping than when producing an axial bearing with two separate cages. The handling and installation of a one-piece cage is also significantly simpler than handling and installing a bearing with two separate cages that must be secured to prevent them from falling apart when the axial bearing is installed or must be installed separately from one another. Because the cage proposed according to the present invention has two needle roller rings, each forming a bearing plane, both bearing planes can be installed in a common installation process. The installation process is very simple because the needle rollers are already snap-fitted into the pockets, thus preventing them from being lost, and the cage equipped with needle rollers is very easy to handle as a complete structural unit and can be placed in the installation position.

[0011] Preferably, according to a refinement of the present invention, the second bottom diameter is greater than the first top diameter of the first pockets. This design results in a pocket pattern in which the inner first pockets are formed in an inner annular region that is slightly radially spaced apart from the outer annular region in which the second pockets are arranged. In other words, in this design, the first and second pockets are separated from each other not only in the circumferential direction but also in the radial direction. This design allows the number of pockets in the respective pocket ring to be varied over a wide range and can also be increased to a maximum value, with the number of outer second pockets typically being greater than the number of first pockets. The second pockets can be arranged not only in radial extension of the first pockets but also partially overlapping or with a gap therebetween, meaning that the respective local arrangement of the pockets can be arbitrarily selected.

[0012] However, in principle, it is also conceivable as an alternative to this that the second bottom circle diameter is smaller than the top circle diameter. In this variant, the first pocket and the second pocket approximately overlap when viewed in the circumferential direction. In this embodiment, the second pocket is arranged sectionally between the two first pockets and extends radially outward.

[0013] Depending on the selected local arrangement of the pockets or the selected base and top diameters, the number of first pockets can correspond to the first number of second pockets or be smaller. For example, if the second pockets are arranged radially as an extension of the first pockets, or if they are arranged with clearance to the first pockets, or if, as described above, there is an overlap in the circumferential direction and the second pockets are necessarily arranged with clearance, then the same number of pockets results. If the base diameter of the second pockets is larger than the top diameter of the first pockets, for example, if the second pockets are arranged not only as an extension of the first pockets but also with clearance to the first pockets, then a larger number of first pockets results. This results in a wide range of possible variations, which can be used to influence, in particular, the load-bearing capacity of the axial bearing, but also the frictional forces.

[0014] According to a refinement of the present invention, the first pocket and the second pocket have the same length when viewed in the radial direction. Consequently, the pockets have the same geometry, i.e., they are of equal length when viewed in the radial direction and equally wide when viewed in the circumferential direction. Consequently, the same needle-shaped rolling element can be inserted into both the first pocket and the second pocket. This is particularly advantageous from a production perspective.

[0015] Alternatively, however, there is also the possibility that, viewed in the radial direction, the first and second pockets have different lengths, but preferably the same width, i.e., needle rollers of two different lengths but the same diameter are used, thereby in turn being able to influence the load-bearing capacity and friction.

[0016] To further stabilize the cage, a cylindrical ring edge is expediently provided on the inner and / or outer circumference of the cage, said ring edge being formed during a stamping or forming process and reinforcing the cage against twisting.

[0017] Furthermore, the axial bearing can also include one or two axial washers on which the rolling elements roll. In principle, the axial bearing can consist solely of a cage and needle rollers, and if correspondingly suitable running surfaces for the rolling elements are provided on the component, the axial bearing itself can be positioned directly against the component to be supported. However, since this is not the case, the axial bearing according to the invention has one or two axial washers, which, on the one hand, have corresponding running surfaces for the rolling elements and, on the other hand, are supported on the corresponding component in the installed position. However, it is also conceivable that the axial bearing is formed solely with a cage equipped with needle rollers, i.e., the additional axial washers are not installed together with the cage, and the needle rollers run directly on the surfaces of the components to be axially supported relative to each other.

[0018] Here, the axial washers can be simple annular washers positioned as separate bearing washers. However, it is also conceivable to design one or each axial washer as an angled washer with a cylindrical washer flange that snaps onto the annular edge of the cage. Thus, in this embodiment, one or two angled washers are connected to the cage to form a simple-to-handle bearing unit, which further simplifies assembly.

[0019] The bearing arrangement is particularly suitable for use in counter-acting linear adjustment devices, such as brake devices such as electromechanical disc or drum brakes or combined electromechanical / hydraulic disc or drum brakes. In these devices, the brake lining is moved relative to and away from the brake element to be decelerated via the bearing arrangement in conjunction with an actuator. Within the scope of a single stroke, only one rotation of less than 360° is achieved via the counter-acting rotational-translational converter to move the brake lining into contact with the brake element, i.e., the brake disc or brake drum, or away from this contact. This means that the axial bearing only needs to perform a few 360° rotations, or typically only one pivoting movement of less than 360°, per braking stroke. In the nearly unloaded state, i.e., in the starting position, the cage and all rolling elements are aligned with one another. However, due to the small pivoting angle, the slippage and deformation conditions that occur during the power stroke are so small that they can be easily absorbed or absorbed by the typical pocket clearances of the rolling elements in their pockets, or only generate very small forces on the cage. After the return stroke into the nearly load-free initial state has been completed, the needle rollers and the cage can be aligned with one another again, and the possible forces can be reduced.

[0020] In addition to the bearing arrangement itself, the present invention also relates to a linear adjustment device comprising an adjustment element to be linearly moved, an electric actuator, and a bearing arrangement, wherein the actuator is coupled to a first component of a rotation-translation converter, while a second component of the rotation-translation converter is coupled to the adjustment element to be moved. The linear adjustment device is characterized by the bearing arrangement according to the present invention, which comprises a rotation-translation converter and an axial bearing provided therein according to the present invention. The rotating first component of the converter, for example, a screw of the converter embodied as a ball screw drive, is supported and mounted on a stationary support component via the axial bearing. The support component can be any surrounding component, such as a wall of a housing accommodating the converter or a wall of a housing of a coupled actuator. The actuator itself is preferably an electric motor, which is optionally coupled to the rotating first component of the converter via a transmission, so that the actuator introduces a rotational motion into the converter. There, the rotational motion is converted into a translational motion of a second, linearly movable component, and, for example, a threaded sleeve is axially displaced. The element to be linearly adjusted is in turn coupled to the component, which then moves accordingly. Since the rotation-translation converter works in opposite directions, the adjustment movement can be performed in both directions. The forces and deformations generated here are best supported or absorbed via the axial bearing integrated in the bearing device according to the invention.

[0021] The linear adjustment device is preferably a braking device comprising at least two brake pads, at least one of which is the adjustment element to be moved and is intended to be moved toward the braking element to be decelerated by means of an actuator. The braking device can be a disc brake or a drum brake. A disc brake comprises a brake caliper with at least two brake pads, at least one of which is connected to the linearly movable second component of the rotation-translation converter as the element to be adjusted. An axial force is applied to the brake pads via the actuator, causing them to press linearly against the brake disc. The brake caliper, also known as a brake caliper, is sometimes mounted in a floating manner, so that the brake disc is pressed and decelerated between the linearly moving brake pad and a brake pad located on the opposite side. The reverse movement of the converter relieves the brake pads again, releasing the braking engagement. In the case of a drum brake, there is a brake drum and two brake pads, typically housed in a roughly semicircular shape, which are pivotally mounted at one end. A common brake cylinder with a bearing arrangement is located between the other ends of the two brake linings, or in the case of a two-phase arrangement, two such brake cylinders are provided for each brake lining. The brake linings are pressed apart via a rotational-translational converter for braking and pressed into frictional contact against the brake drum, or pivoted onto each other to release the frictional contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the following, the present invention will be described based on embodiments with reference to the accompanying drawings. The accompanying drawings are schematic diagrams and show:

[0023] Figure 1 shows a top view of an axial bearing provided for a bearing arrangement according to the invention,

[0024] Figure 2 Show Figure 1 sectional view of an axial bearing in FIG, which additionally has two axial washers,

[0025] Figure 3 Shows something like Figure 2 A cross-sectional view of an axial bearing having two angled spacers, and

[0026] Figure 4 The diagram shows the principle of a linear adjusting device according to the invention in the form of a braking device, which comprises a bearing arrangement according to the invention with a rotation-translation converter. DETAILED DESCRIPTION

[0027] Figure 1 An axial bearing 1 is shown, which is designed for integration into a bearing assembly or linear adjustment device according to the present invention. The axial bearing comprises a cage 2 formed from sheet metal, for example by stamping or laser cutting. Two independent pocket rings are provided in the cage in two independent annular pocket areas 3 and 4, each of which accommodates a rolling element. The first pocket area 3, viewed radially inward, comprises a plurality of independent first pockets 5, which are equidistantly spaced from one another in the circumferential direction. The pockets 5 all lie on a common first base diameter F1. They all have the same length and width.

[0028] In the radially outer second pocket region 4, a plurality of second pockets 6 are also provided, spaced equidistantly from one another in the circumferential direction. All of the second pockets are located on a common second bottom diameter F2 and all of the second pockets have the same length and width. Figure 1 In the embodiment, the first pocket and the second pocket 5, 6 also all have the same length and the same width, so that a corresponding first rolling body 7 is accommodated in the first pocket and a second rolling body 8 is accommodated in the second pocket, and the rolling bodies are each implemented as elongated needle rollers.

[0029] It can be seen that the second bottom circle diameter F2 is larger than the first bottom circle diameter F1. The second bottom circle diameter F2 is also slightly larger than the first top circle diameter K1 of the first pocket 5, as shown in FIG. Figure 1 That is, the second pocket 6 or the second pocket area 4 is viewed radially through the second pocket area 4. Figure 2The narrow webs 9 shown in FIG are radially spaced apart from one another. Thus, the pockets 5 are separated from the pockets 6 not only in the radial direction but also in the circumferential direction.

[0030] In the exemplary embodiment shown, the number of second pockets 6 is greater than the number of first pockets 5. Consequently, the spacing of the second pockets 6 from one another in the circumferential direction is smaller than the spacing of the first pockets 5. The second pockets 6 are partially located in the radial extension of the first pockets or have a clearance from two adjacent first pockets 5.

[0031] like Figure 2 As shown, the cage 2 has a cylindrical edge 10 on the outer circumference and a likewise cylindrical edge 11 on the inner circumference, which edges impart corresponding stability to the cage. Figure 2 Also shown are rolling elements 7 , 8 , which are accommodated in the first and second pockets 5 , 6 .

[0032] Likewise shown are two axial washers 12, 13 designed as simple washers, each having a running surface 14, 15 on which the rolling elements 7, 8 roll. When installed, the axial washers 12, 13 each rest against one of the components of the bearing arrangement that are to be supported relative to one another.

[0033] The axial bearing 1 is characterized by a number of advantages. On the one hand, the load-bearing capacity of the axial bearing can be varied within a wide range by determining the number of pockets 5, 6 in the respective pocket area 3, 4 according to the requirements. Figure 1 In addition to the embodiment shown in FIG, in which more second pockets 6 are provided than first pockets 5, it is conceivable to keep the number of pockets the same, in which case all second pockets 6 would then either be located in the radial extension of the first pockets 5 or would all be spaced apart from them. The smaller the number of pockets, the lower the load-bearing capacity. As the number of pockets increases, the load-bearing capacity also increases due to the greater number of rolling elements.

[0034] Another advantage is the compactness achieved by using a one-piece ring 2. This allows the two pocket areas 3, 4, and therefore the rolling elements 7, 8, to be arranged very close to one another in radial direction. Because the webs 9 can be designed to be very narrow, the pocket areas 3, 4, and thus the pockets 5, 6, can be positioned as close to one another as possible. This results in the cage 2 being relatively narrow in radial direction and still having the same load-bearing capacity as a significantly wider, two-piece cage of a double-row axial bearing. On the other hand, increasing the cage width inevitably leads to a significant increase in load-bearing capacity compared to a two-piece cage, since the pockets are designed to be longer in radial direction, allowing the use of longer rolling elements.

[0035] The cage 2 itself is also very stable with respect to pocket geometry, which is largely maintained even under load due to the cage's rigidity. Because the web 9 is formed between two separate pocket areas 3, 4 located radially inside one another, the pockets 5, 6 are radially shorter than in a similar single-row bearing, which has a positive effect on the pocket geometry and rolling element guidance. Of course, the handling and assembly of this axial bearing or this one-piece, yet also double-row, cage is significantly simpler because, unlike a two-piece cage in which the individual cage components must either be assembled separately or fixed to one another to prevent them from falling apart, only one component must be installed.

[0036] Figure 2 An embodiment of an axial bearing 1 is shown, in which two simple planar axial washers 12, 13 are used, while Figure 3 An embodiment of an axial bearing 1 is shown, in which two angled washers 16, 17 are used as axial washers. Each angled washers has a cylindrical washers flange 18, 19, which is located on the inner circumference in the case of the angled washers 16 and on the outer circumference in the case of the angled washers 17. Each washers flange 18, 19 is provided with a plurality of latching flanges 20, which snap behind the double-layered annular edge 10, 11 of the cage 2, so that a fixed structural unit is obtained, which consists of the cage 2 with the rolling bodies 7, 8 in the corresponding pockets 5, 6 and the two angled washers 16, 17. The angled washers 16, 17 in turn provide corresponding running tracks 14, 15 on which the rolling elements 7, 8 roll. In terms of operation and installation, the axial bearing 1 is more convenient than the conventional bearing. Figure 2 The axial bearing 1 in the Figure 2 In the axial bearing, the axial washers 12 and 13 are not connected to the cage 2, so the axial washers must be installed independently. Figure 3 The axial bearing 1 in the embodiment is a self-retaining structural unit. Although not shown, it is also conceivable to have only one self-retaining axial washer and to bear directly on the component to be supported on the other side. This can reduce the required axial and radial installation space.

[0037] at last, Figure 4The diagram shows the principle of a linear adjustment device according to the present invention in the form of a brake device 21, which includes a bearing arrangement according to the present invention. Braking device 21, designed as a caliper brake, comprises a brake caliper 22 and two brake pads 23, 24, with a brake disk (not shown in detail) disposed between the caliper and the brake pads. Furthermore, an actuator 25 is provided, via which the brake pads 24 can be moved axially and pressed against the brake disk. This means that a corresponding axial force can be applied to the brake pads 24 via the actuator 25.

[0038] The actuator 25 has an electric motor 26 with a downstream transmission 27. The transmission 27 is in turn connected to an integrated bearing arrangement according to the present invention or its rotational-translational converter 28, via which the rotational motion of the output of the electric motor 26 or the transmission 27 is converted into a translational motion for linearly moving the brake pad 24. For this purpose, the rotational-translational converter 28 is designed as a spindle drive 29, which includes a spindle 30 with an external thread, which is coupled to the transmission 27 by its spindle shaft 31. Furthermore, a nut 34 with an internal thread is provided, which is linearly displaceable but rotationally fixedly accommodated in a stationary housing 32 in which the rotational-translational converter 28 is accommodated. The nut accommodates the spindle shaft 30 therein and is connected to a piston 33. The spindle shaft 30 and the nut 34 are coupled to each other via rolling elements 35 in the form of balls, as is customary in spindle drives. Thus, a rotation of the spindle shaft 30, which is fixed in the axial direction, necessarily causes a linear movement of the nut 34 and the brake piston 33, which in turn is connected to the brake lining 24. Embodiments are also possible in which the brake piston and the nut are components, or in which the linearly moving component (here the nut) is pressed directly against the brake lining.

[0039] For axial support and rotational support of the threaded spindle 30, an axial bearing 1 is provided, which is arranged between the threaded spindle 30 or a projection 37 of the threaded spindle 30 and a flange 36 of the housing 32. While the threaded spindle 30 is rotationally supported relative to the housing 32, the axial forces acting on the threaded spindle 29 when the brake lining 24 is pressed are supported toward the housing 32 via the axial bearing 1 with its correspondingly high load-bearing capacity but low friction.

[0040] In this example, the bearing arrangement according to the present invention is formed by a rotation-translation converter 28, an axial bearing 1, and a housing 32. The lead screw represents a first member that is fixed in axial position but rotates due to being driven by an actuator, the nut represents a second member that moves linearly, and the housing represents an axially fixed support member. The first member and the support member are supported or rotationally mounted relative to each other via the axial bearing 1.

[0041] Reference Signs List

[0042] 1 Axial bearing

[0043] 2 Cage

[0044] 3 pocket area

[0045] 4 Pocket area

[0046] 5 pockets

[0047] 6 pockets

[0048] 7 Rolling elements

[0049] 8 rolling elements

[0050] 9 Connecting piece

[0051] 10 Ring Edge

[0052] 11 Ring Edge

[0053] 12 Axial spacer

[0054] 13 Axial spacer

[0055] 14 Traveling surface

[0056] 15 Traveling surface

[0057] 16 Angled spacers

[0058] 17 Angled spacers

[0059] 18 Gasket flange

[0060] 19 Gasket flange

[0061] 20 Locking lug

[0062] 21 Braking system

[0063] 22 brake calipers

[0064] 23 brake linings

[0065] 24 brake linings

[0066] 25 actuators

[0067] 26 Electric Motor

[0068] 27 Transmission

[0069] 28 Rotation-Translation Converter

[0070] 29 Screw drive mechanism

[0071] 30 screw

[0072] 31 Screw shaft

[0073] 32 shell

[0074] 33 Piston

[0075] 34 Nut

[0076] 35 rolling elements

[0077] 36 flange

[0078] 37 bulge

[0079] F1 bottom circle diameter

[0080] F2 bottom circle diameter

[0081] K1 top circle diameter.

Claims

1. A bearing device comprising: a rotation-translation converter (28), the rotation-translation converter comprising a first member that is fixed in an axial position and rotates, and a second member that can be axially moved by the rotation of the first member; a support member and an axial bearing (1), the first member that rotates is supported on the support member via the axial bearing, characterized in that: The axial bearing (1) is a needle roller bearing having only one retaining frame (2), wherein the retaining frame (2) has a plurality of first pockets (5) provided with needle rollers and a plurality of second pockets (6) separated from the first pockets (5) and provided with needle rollers, wherein the first pockets have a first bottom circle diameter (F1), and the second pockets have a second bottom circle diameter (F2), wherein the second bottom circle diameter (F2) is larger than the first bottom circle diameter (F1).

2. The bearing device according to claim 1, characterized in that The second bottom circle diameter (F2) is larger than the first top circle diameter (K1) of the first pocket (5), or the second bottom circle diameter (F2) is smaller than the first top circle diameter (K1).

3. The bearing device according to claim 1, characterized in that The number of the first pockets (5) corresponds to the number of the second pockets (6), or the number of the first pockets (5) is smaller than the number of the second pockets (6).

4. The bearing device according to claim 1, characterized in that Viewed in the radial direction, the first pocket and the second pocket (5, 6) have the same length, or viewed in the radial direction, the first pocket and the second pocket (5, 6) have different lengths.

5. The bearing device according to claim 1, characterized in that A cylindrical ring edge (10, 11) is provided on the inner circumference and / or the outer circumference of the retaining frame (2).

6. The bearing device according to any one of claims 1 to 5, characterized in that: The bearing device comprises one axial washer or two axial washers (12, 13), on which rolling bodies (7, 8) roll.

7. The bearing device according to claim 6, characterized in that The or each axial washer is implemented as an angled washer (16, 17) having a cylindrical washer flange (18, 19) which snaps onto the annular edge (10, 11) of the cage (2).

8. A linear adjustment device, characterized in that: The linear adjustment device includes an adjustment element to be moved linearly, an electric actuator, and a bearing device according to any one of claims 1 to 7, wherein the actuator is coupled to a first component of the rotation-translation converter, and the second component of the rotation-translation converter is coupled to the adjustment element to be moved.

9. The linear adjustment device according to claim 8, characterized in that: The linear adjustment device is a brake device comprising at least two brake linings (23, 24), at least one of which is the adjustment element to be moved and can be moved toward the brake element to be decelerated by means of the actuator.

10. The linear adjustment device according to claim 9, characterized in that: The linear adjustment device is a caliper brake or a drum brake.

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