Bearing cages for rolling element bearings

Abstract

Disclosed is a two-part bearing retainer (1) for a rolling element bearing, comprising a first retainer half (100) and a second retainer half (200) preferably having the same structure as the first retainer half (100), wherein each of the bearing retainer halves comprises an annular base (10), a protrusion (6) extending axially therefrom, and a protrusion receiving portion (8) of complementary structure, wherein the protrusion of one retainer half engages in the protrusion receiving portion of the other retainer half, wherein during engagement in the protrusion receiving portion, the protrusion forms a bearing retainer bridge (2), wherein a bearing retainer cavity (4) for receiving a rolling element (54) of the rolling element bearing is formed between the bearing retainer bridges, wherein the protrusion (6) and / or the protrusion receiving portion (8) comprise a sacrificial material (28) on their respective contact surfaces, wherein the sacrificial material is constructed to melt under the action of ultrasound to connect the first retainer half to the second retainer half.

Description

Technical Field

[0001] The present invention relates to a two-part bearing cage for a rolling element bearing according to the preamble of technical solution 1. In addition, the present invention relates to an ultrasonic welding device according to technical solution 11. In addition, the present invention relates to a bearing cage for a rolling element bearing ( / rolling bearing) according to the preamble of technical solution 12. Background Art

[0002] For various applications, such as in ball bearings, it is known to use two-part bearing cages consisting of identical bearing cage halves. However, the bearing cages used to date can suffer from the following situation: at high rotational speeds, the retaining elements for connecting the two bearing cage halves bend radially outwards, so that the cage expands and thus comes into contact with the outer ring and increases the friction of the rolling elements or causes the rolling elements to seize. Since in the event of a failure of the retaining elements used, both radial and axial retention of the cage is lost, the known bearing cages are also not suitable for high loads in the radial and axial direction. Summary of the invention

[0003] It is therefore an object of the present invention to provide a two-part bearing cage which is also suitable for high rotational speeds and which can accommodate high radial and axial loads.

[0004] This object is achieved by a bearing retainer according to Technical Solution 1 and Technical Solution 12 and an ultrasonic welding device for manufacturing such a bearing retainer according to Technical Solution 11.

[0005] The bearing cage comprises a first cage half and a second cage half, preferably the second cage half is constructed identically to the first cage half, each cage half comprising an annular base, a protrusion (pin) extending axially ( / along the axial direction) from the annular base, and a protrusion receiving portion (pin receptacle) constructed complementarily. The protrusion of one cage half can be engaged in the protrusion receiving portion of the other cage half, wherein during the engagement of the protrusion in the protrusion receiving portion, the protrusion forms a bearing cage bridge, and a bearing cage cavity ( / pocket hole) for receiving the rolling elements of a rolling element bearing ( / rolling bearing) is formed between the bearing cage bridge.

[0006] In order to reliably hold the two cage halves even at high rotational speeds, the projections and / or the projection receivers comprise a sacrificial material on the respective contact surfaces. When assembling the first cage half and the second cage half, the sacrificial material is melted ( / melted) under the action of ultrasound to subsequently connect the two cage halves.

[0007] By using ultrasound, the cage halves can be quickly connected, with simple operation and durability. The sacrificial material can be melted ( / melted) due to the action of the ultrasound to connect the first cage half and the second cage half not only at the contact surface where the sacrificial material was originally present, but also to extend to other contact surfaces of the two cage halves by the sacrificial material diffusing in a molten ( / melted) state and flowing into the gap that may exist between the cage halves. In this way, the connection between the two cage halves can be further improved.

[0008] According to one embodiment, each projection receiving portion comprises a ring portion arranged radially outward and extending axially, which ring portion radially outwardly supports each projection engaged in the projection receiving portion. Since there is radial support for each projection, it is possible to prevent the projection from bending radially outward. Thereby, it is possible to ensure that no contact occurs between the bearing cage and the outer ring even at high rotational speeds. In this way, it is expected that neither the friction in the bearing will be increased nor premature failure of the bearing will be caused.

[0009] Here, it is preferred when the ring portion extending in the axial direction is formed on the annular base of the cage half. Due to this one-piece design between the ring portion and the annular base, radial forces introduced into the ring portion can be transferred to the base, so that even in the case of high stress in the ring portion, the cage is prevented from widening ( / expanding) radially outwards.

[0010] According to another exemplary embodiment, each protrusion comprises a radially outward gradient which interacts with the ring portion of the protrusion receiving portion so that the cage bridge formed by the protrusion and the protrusion receiving portion has a homogeneous outer surface. Such a homogeneous outer surface can be achieved, for example, so that lubricant located in the area of ​​the bearing and the area of ​​the bearing cage is not collected in the recess of the cage body (thus causing the lubricant to flow and thus making lubrication of the rolling elements no longer available). In addition, the homogeneous outer surface can make it possible to guide the rolling elements via the cage bridge without problems.

[0011] During assembly of the two cage halves, the two cage halves are first held at a certain distance by the sacrificial material. If the sacrificial material melts under the effect of the ultrasound, this distance no longer exists and the two cage halves are pushed closer together. Due to the transition, it can be ensured here that during the melting of the sacrificial material the two cage parts cannot be pushed together further than desired, but abut the transition. In this way, since the transition ensures a defined distance between the cage halves, it can also be prevented that in the case of a fully connected cage, the rolling elements are clamped between the two cage parts.

[0012] According to a further embodiment, each cage half comprises a cage cell half, wherein the cage cell has a toroidal cell geometry which is adapted radially inwardly to a spherical shell and extends radially outwardly in a cylindrical manner. Due to this toroidal cell geometry, the rolling elements, in particular the balls, can be completely enclosed radially inwardly, which results in particularly good rolling element guidance. Furthermore, the cylindrical outer design of the cell geometry allows a good supply of lubricant, since the rolling elements are not directly enclosed radially outwardly, but a gap remains between the rolling elements and the cells, into which the lubricant can easily penetrate.

[0013] According to another embodiment, the cage is made of plastic, in particular, the cage is made of injection moldable plastic. It is particularly advantageous here that the plastic is such as PEEK, PA4.6 or PA6.6, preferably PEEK, PA4.6 or PA6.6 is made with carbon fiber or glass fiber with a content of 15%-30%. Such a plastic cage is easy to manufacture and also easy to assemble in two parts. Since the bearing cage proposed here uses the above-mentioned protrusions for support, the plastic cage remains stable even at high rotational speeds. In particular, such a lightweight plastic cage can be used in ball bearings. Due to the use of a plastic cage, high rotational speeds can be achieved because the plastic cage has a low weight.

[0014] According to another embodiment, the sacrificial material is wedge-shaped, pyramidal or conical. Other forms are also possible. In each case, the sacrificial material is provided as additional material on the protrusion and / or the protrusion receiving portion; the sacrificial material melts ( / melts) due to the effect of ultrasound. Preferably, the sacrificial material consists of a plastic material having a lower melting temperature than the remaining cage material.

[0015] In order to be able to melt ( / melt) the sacrificial material by the action of ultrasound, the first cage half and / or the second cage half can include a main contact surface adjacent to the contact surface. Due to the main contact surface, the ultrasound can be particularly well conducted to the contact surface and / or to the sacrificial material. Preferably, an ultrasonic welding device is applied to the main contact surface in order to be conducted via the main contact surface to the contact surface or to the sacrificial material.

[0016] According to another embodiment, the first cage half and / or the second cage half comprises a secondary contact surface, which is opposite to the contact surface and is configured to guide ultrasound into the contact surface and / or the sacrificial material. Here, the secondary contact surface can be opposite to the contact surface in the axial orientation of the cage. In this way, the sacrificial material can preferably be heated by ultrasound from both sides in the axial direction (via the primary contact surface and the secondary contact surface).

[0017] Furthermore, a wedge-shaped surface can be formed on each of the retaining bridges, the wedge-shaped surface being configured to guide the ultrasonic wave from the secondary contact surface to the contact surface. The wedge-shaped surface can include a material that is particularly suitable for conducting ultrasonic waves. For example, such a material can be realized by a fiber component in the plastic of the retaining material. Due to the conduction of the ultrasonic wave to the secondary contact surface, the melting ( / melting) of the sacrificial material can be accelerated.

[0018] According to another aspect, an ultrasonic welding device is proposed, which is adapted to the shape of such a two-part bearing cage. The ultrasonic welding device may comprise a first part adapted to the first cage half and a second part adapted to the second cage half.

[0019] According to another aspect, a bearing cage for a rolling element bearing is proposed, the bearing cage comprising a first cage half and a second cage half, preferably the second cage half being constructed identically to the first cage half, the first cage half and the second cage half each comprising an annular base, a protrusion extending axially from the annular base and a complementary protrusion receiving portion. The protrusion of one cage half engages in the protrusion receiving portion of the other cage half, and due to the engagement of the protrusion in the protrusion receiving portion, the protrusion forms a bearing cage bridge, between which a bearing cage cavity for receiving the rolling elements of the rolling element bearing is formed. The protrusions and / or the protrusion receiving portions are connected at least at the respective contact surfaces by a layer comprising a molten sacrificial material. Preferably, the sacrificial material may comprise the same material as the material of the two cage halves.

[0020] Due to the ultrasonic welding process, the sacrificial material is melted ( / melted) and remains inside the cage structure. This means that the layers connecting the protrusion and the protrusion receiver to each other are constructed as welded connections and are completely located inside the cage, and because there are no externally visible welds or welds.

[0021] Further advantages and advantageous embodiments are indicated in the description, the drawings and the claims. In this context, in particular, the combinations of features indicated in the description and the drawings are only exemplary, so that the features may also exist alone or in other combinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, the present invention will be described in more detail using the exemplary embodiments depicted in the accompanying drawings. Herein, the exemplary embodiments and the combinations shown in the exemplary embodiments are merely exemplary and are not intended to limit the scope of the present invention. The scope is limited only by the pending claims.

[0023] Figure 1 shows a schematic perspective view of a two-part bearing cage;

[0024] Figure 2 shows a schematic detail view of a first cage half;

[0025] Figure 3 A schematic detail view of the second cage half is shown;

[0026] Figure 4 Shows Figure 2 and Figure 3 A first exemplary embodiment of a sacrificial material in;

[0027] Figure 5 Shows Figure 2 and Figure 3 A second exemplary embodiment of a sacrificial material in;

[0028] Figure 6 Shows Figure 2 and Figure 3 A third exemplary embodiment of a sacrificial material in;

[0029] Figure 7 A schematic diagram showing the assembly of two cage halves;

[0030] Figure 8 Another schematic diagram showing the assembly of two cage halves;

[0031] Fig. 9 Another schematic diagram showing the assembly of two cage halves;

[0032] Fig.10 shows a schematic detail view of a cage half including a contact surface for an ultrasonic welding device;

[0033] Fig.11 shows another schematic detail view of a cage half including a contact surface for an ultrasonic welding device;

[0034] Fig.12shows another schematic detail view of a cage half including a contact surface for an ultrasonic welding device;

[0035] Fig.13 shows another schematic detail view of a cage half including a contact surface for an ultrasonic welding device;

[0036] Fig.14 A schematic perspective view of a holding device for an ultrasonic welding device is shown;

[0037] Fig.15 The assembled bearing cage is shown Fig.14 A schematic perspective view of a retaining device; and

[0038] Fig.16 Shows Fig.15 Cross-sectional view of .

[0039] In the following, identical or functionally equivalent elements are denoted by the same reference numerals.

[0040] 1 Bearing cage

[0041] 2 Bridge

[0042] 4 Cage cavity

[0043] 6 Protrusion

[0044] 8 protrusion receiving portion

[0045] 10 Matrix

[0046] 12 Ring portion extending in the axial direction

[0047] 14 Uniform outer surface

[0048] 16 Gradient

[0049] 18, 19, 20 Centering surfaces

[0050] 22, 24 Stop surface

[0051] 26 Centering surface

[0052] 28 Sacrificial Materials

[0053] 30, 32, 34 connection surfaces

[0054] 36 Main contact surface

[0055] 38 Pair of contact surfaces

[0056] 40 Cage half bridge

[0057] 42 Main contact surface

[0058] 44 Negative Shape

[0059] 46 Support surface

[0060] 48 Centering device

[0061] 50 Support surface

[0062] 52 Support surface

[0063] 54 balls

[0064] 56 Gap

[0065] 58 Inner Circle

[0066] 60 outer ring

[0067] 62 Preload

[0068] 100 First cage half

[0069] 200 Second cage half

[0070] 300 Holding device DETAILED DESCRIPTION

[0071] Figure 1 1 shows a schematic spatial view of a bearing cage 1 for a ball bearing, which includes a first bearing cage half 100 and a second bearing cage half 200. Here, the bearing cage halves 100 and 200 are constructed identically. Figure 1 As can be further seen, the bearing cage 1 includes bridges 2, between which cage cavities 4 are formed, in which rolling elements (not shown) can be accommodated. Here, the cage cavity 4 has a toroidal shape; this means that the cage cavity 4 is spherical on its radial inner side 4-1, while the cage cavity 4 is cylindrical on its radial outer side 4-2. This toroidal design enables the rolling elements (i.e., balls) to be well guided on the radial inner side 4-1 and to be completely enclosed in the cavity 4, while on their radial outer area 4-2, the rolling elements have a certain spacing from the bearing cage 1, so that the lubricant can penetrate into the gap between the rolling elements and the bearing cage 1, so that the balls can be lubricated particularly well. In addition, from Figure 1 It can be seen that the cage bridge 2 is formed by the engagement of the projections ( / pins) 6-1, 6-2 of the respective cage halves 100, 200 into the corresponding projection receiving portions ( / pin receiving portions) (pin receptacle) 8-1, 8-2. Here, the engagement of the projections 6-1, 6-2 into the projection receiving portions 8-2, 8-1 makes it possible to fix the cage halves 100, 200 both radially and axially.

[0072] Each cage half 100 includes an annular base 10, from which a protrusion 6 extends, and in which a protrusion receiving portion 8 is formed. Here, each protrusion receiving portion 8 includes an axially extending ring portion 12, which extends axially on the protrusion 6 during the reception of the protrusion 6 and thereby supports the protrusion 6 radially outward. This axial ring portion 12 prevents the protrusion 6 of the cage from bending radially outward and contacting the bearing ring of the receiving bearing cage 1 even under high centrifugal forces, which would result in increased friction and premature failure of the bearing. In addition, in Figure 2 and Figure 3 As can be seen in FIG. 1 , the ring portion 12 is formed integrally with the annular base body 10 . As a result, radial forces can be supported and transferred into the base body 10 , so that even under high radial loads no bending-opening of the cage 1 occurs.

[0073] In order to achieve a particularly good bond, for example Figure 1 As shown in FIG. 1 , a uniform outer surface 14 is formed on the bearing retainer 100 , and the protrusion 6 includes a gradation 16 that interacts with the ring portion 12 . Figures 2 to 6 The design of the projection 6 and the projection receptacle 8 can also be seen in the enlarged section of FIG.

[0074] Figure 2 A schematic diagram of a cage half 100, 200 is shown. In order to be able to correctly assemble the two cage halves 100, 200, a side surface 18 is provided on the protrusion receiving portion 8, which side surface 18 serves as a centering surface for the corresponding protrusion 6. The protrusion receiving portion 8 comprises a further centering surface 20, which is also used for the correct insertion of the protrusion 6. Corresponding stop surfaces 22, 24 are provided on the protrusion receiving portion 8 and the protrusion 6. In addition to the gradient 16, these stop surfaces 22, 24 ensure that the two cage halves 100, 200 cannot be pushed together too far, but abut each other at the stop surfaces 22, 24. In this way, sufficient space is provided for the balls in the cage 1.

[0075] The sacrificial material 28 is arranged on the protrusion 6 or the protrusion receiving portion 8 or both, and the sacrificial material 28 is melted ( / melted) by ultrasound after the cage halves 100, 200 are assembled. Here, the sacrificial material is arranged on the surfaces of the protrusion 6 and / or the protrusion receiving portion 8 that are in contact with each other in the assembled state. The sacrificial material can have various shapes, such as in a wedge shape (see Figure 4 ), cone (see Figure 5 ) as an example or it may also be a pyramid or a sphere. Figure 4 and Figure 5As shown in FIG. 6 , a sacrificial material is provided on the protrusion 6, such as Figure 6 As shown, sacrificial material can also be provided in the protrusion receiving portion 8. In addition, sacrificial material can be provided on the protrusion 6 and in the protrusion receiving portion 8 at the same time.

[0076] exist Figures 7 to 9 , the assembly of the two cage halves 100, 200 is now described. During the assembly of the two symmetrical cage halves 100, 200, they are aligned in the radial direction by means of the centering surface 19 and in the circumferential direction by means of the surfaces 20, 26. This has the advantage that possible distortions, deformations or dimensional deviations caused by the manufacturing process of the cage 100, 200 can thereby be compensated.

[0077] During assembly of the two cage halves 100, 200, a gap of several millimeters is maintained between the two cage halves. If the sacrificial material 28 is molten ( / melted) by ultrasonic welding, the sacrificial material 28 flows into the connecting surfaces 30, 32, 34 (see Fig. 9 ). Possible play that may occur between the cage halves 100, 200 due to manufacturing tolerances can thereby be eliminated. Thus, during operation of the bearing, relative movements that would lead to damage to the cage 1 can no longer occur.

[0078] The stop surfaces 22, 24 define the axial spacing of the cage halves. Since the axial spacing is defined by these surfaces, a constant width of the ball cell 4 can be ensured. Therefore, it is not possible to fall below a minimum width so that the balls do not jam in the cells during assembly or operation of the bearing. Such jamming can occur due to the different expansions caused by different materials (e.g. balls made of steel or ceramic and plastic cages) at different temperatures. In addition, by using the axial stops of the stop surfaces 22, 24, it is also possible to avoid the formation of possible gaps in the cell 4, which would cause negative characteristics in operation. Such gaps could lead to wear of the cage or the balls and have a negative impact on the lubricating film.

[0079] exist Figures 10 to 13 , contact surfaces 36, 38, 42 for conducting ultrasonic waves ( / ultrasound) to the protrusion 6 or the protrusion receiving portion 8 and the corresponding sacrificial material 28 are shown. The ultrasonic welding device can include a main contact surface 36 and two secondary contact surfaces 38 for each retaining bridge. Here, the main contact surface 36 directly abuts the sacrificial material 28. For example, this Fig.13 : Here, the main contact surface 36 is opposite to the projection receiving portion 8. In this way, ultrasound waves can be introduced directly into the sacrificial material 28. Therefore, the main contact surface 36 provides: ultrasound waves are introduced directly into the surface comprising the sacrificial material 28 or the opposite surface.

[0080] In addition, the ultrasonic waves are introduced via the adjacent surface 38 and are also conducted to the sacrificial material 28 via the wedge-shaped cage bridge half 40. Here, preferably, the cage 1 can include a fiber component in the plastic, in particular a carbon fiber component, which helps to conduct the ultrasonic waves well to the sacrificial material 28. Due to the primary contact surface 36 and the secondary contact surface 38 and the cage bridge half 40, the ultrasonic waves can be conducted to the protrusion receiving portion 8 or the opposite surface and the protrusion 6 or the opposite surface, so that the sacrificial material 28 is particularly well melted ( / melted).

[0081] In some embodiments of the cage 1, the ultrasonic welding device can be extended to another main contact surface 42 located in the protrusion 6. This is particularly useful in wider variants of the cage 1, because as the spacing of the two welding points of each cage cavity bridge increases, the ultrasonic waves cannot advance sufficiently. This can be prevented by the other main contact surface 42.

[0082] Figures 14 to 16 A holding device 300 of an ultrasonic welding device is shown. The holding device 300 shows a negative shape 44 on the rear side of the cage. The negative shape 44 has a corresponding number of ball cavities, a support surface 46 for the bearing inner ring, and a centering device 48 for the bearing inner ring. Here, the negative shape 44 is configured so that the rear surface of the protrusion receiving portion 8 and the rear surface of the protrusion 6 are mainly supported, because these surfaces must support the forces applied during ultrasonic welding. In addition, the cage halves 100, 200 will be prevented from rotating around the rotation axis of the bearing to achieve high positioning accuracy during ultrasonic welding. This is also achieved by the negative shape 44 and the support surfaces 46, 48.

[0083] During ultrasonic welding, the support surface 46 supports the bearing inner ring in the vertical direction. In addition, the centering device 48 for the bearing inner ring is positioned so that the bearing inner ring does not collide with the ultrasonic welding device due to the cage clearance. The cage is provided with further support surfaces 50, 52, wherein the vertical spacing of the support surfaces 50, 52 to the support surface 46 is configured so that there is a surrounding gap 56 between the rolling elements and the cage halves 100, 200. This will prevent the rolling elements from coming into direct contact with the oscillating component (i.e., the cage halves 100, 200 and the ultrasonic welding device), thereby preventing damage to the bearing during the ultrasonic welding process.

[0084] Only the bearing inner ring 58 abuts against the support surface 46. The bearing outer ring 60 is not supported in the vertical direction. During ultrasonic welding, a sufficiently large preload force 62 is applied to the bearing outer ring 60 in the vertical direction toward the support surface 46, thereby clamping the bearing assembly, the bearing outer ring 60, the rolling elements 54 and the bearing inner ring 58 to each other. Due to this clamping, no relative movement occurs between the bearing components during the welding process, which relative movement could cause bearing damage.

[0085] In summary, a simple production of a bearing cage by ultrasonic welding is proposed, wherein the resulting cage ensures a secure hold of the two cage halves even at high rotational speeds. For this purpose, the projections and / or the projection receivers comprise a sacrificial material on the surfaces contacting them respectively, which melts ( / melts) under the action of ultrasound and subsequently connects the two cage halves.

Claims

1. A two-part bearing cage (1) for a rolling element bearing, comprising a first cage half (100) and a second cage half (200), wherein the first cage half (100) and the second cage half (200) each comprise an annular base body (10), a protrusion (6) extending axially from the annular base body (10), and a complementary protrusion receiving portion (8), wherein: A protrusion (6) of one cage half engages in a protrusion receiving portion (8) of the other cage half, and during the engagement of the protrusion (6) in the protrusion receiving portion (8), the protrusion (6) forms a bearing cage bridge (2), and a bearing cage cavity (4) for receiving the rolling elements (54) of the rolling element bearing is formed between the bearing cage bridges (2), characterized in that the protrusion (6) and / or the protrusion receiving portion (8) include a sacrificial material (28) on their respective contact surfaces, the sacrificial material (28) being configured to melt under the action of ultrasound to connect the first cage half (100) to the second cage half (200), the sacrificial material being provided as additional material on the protrusion and / or the protrusion receiving portion; The first cage half (100) and / or the second cage half (200) comprises at least one main contact surface (36, 42) abutting the contact surface to conduct ultrasonic waves into the contact surface and / or the sacrificial material (28), the main contact surface directly abutting the sacrificial material, the main contact surface being used for applying an ultrasonic welding device.

2. The two-part bearing cage according to claim 1, characterized in that Each protrusion receiving portion (8) comprises a ring portion (12) arranged radially outward and extending axially, the ring portion (12) supporting each protrusion (6) engaged in the protrusion receiving portion (8) radially outward.

3. The two-part bearing cage according to claim 2, characterized in that The ring portion (12) extending in the axial direction is formed on the annular base (10) of the cage half.

4. A two-part bearing cage according to claim 2 or 3, characterized in that: Each protrusion (6) comprises a radially outward transition (16), which interacts with the ring portion (12) of the protrusion receiving portion (8) so that the cage bridge (2) formed by the protrusion (6) and the protrusion receiving portion (8) has a uniform outer surface (14).

5. A two-part bearing cage according to any one of claims 1 to 3, characterized in that Each cage half (100, 200) comprises a cage-cell half-shell, wherein the cage cell (4) has a circular ring-shaped cell geometry which is adapted to the spherical shell radially inwardly and extends cylindrically radially outwardly.

6. A two-part bearing cage according to any one of claims 1 to 3, characterized in that The retaining frame (1) is made of plastic.

7. A two-part bearing cage according to any one of claims 1 to 3, characterized in that The sacrificial material (28) is wedge-shaped, pyramid-shaped or cone-shaped.

8. A two-part bearing cage according to any one of claims 1 to 3, characterized in that The first cage half (100) and / or the second cage half (200) comprises a secondary contact surface (38) which is opposite to the contact surface and is configured to conduct ultrasonic waves into the contact surface and / or the sacrificial material (28).

9. The two-part bearing cage according to claim 8, characterized in that The retaining bridges (2) each form a wedge-shaped surface (40), and the wedge-shaped surface (40) is configured to conduct ultrasonic waves from the auxiliary contact surface (38) to the contact surface.

10. The two-part bearing cage according to claim 1, characterized in that The second cage half (200) is constructed identically to the first cage half (100).

11. A two-part bearing cage according to any one of claims 1 to 3, characterized in that The retaining frame (1) is made of injection-moldable plastic.

12. A two-part bearing cage according to any one of claims 1 to 3, characterised in that The retaining frame (1) is made of PEEK, PA4.6 or PA6.

6.

13. A two-part bearing cage according to any one of claims 1 to 3, characterised in that The retaining frame (1) is made of plastic with a carbon fiber or glass fiber content of 15%-30%.

14. An ultrasonic welding device adapted to the shape of the two-part bearing cage (1) according to any one of claims 1 to 13 and configured to apply ultrasonic waves to the bearing cage (1).

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