WO2024056260A1

WO2024056260A1 - Bearing assembly comprising a shaft, a housing part and a bearing, and gearing comprising a bearing assembly

Info

Publication number: WO2024056260A1
Application number: PCT/EP2023/070733
Authority: WO
Inventors: Steffen Saar; Tobias Schwan; Christoph Ruppaner
Original assignee: Sew-Eurodrive Gmbh & Co. Kg
Priority date: 2022-09-12
Filing date: 2023-07-26
Publication date: 2024-03-21
Also published as: DE102023003078A1

Abstract

A bearing assembly comprising a shaft, a housing part and a bearing; and a gearing comprising a bearing, wherein: an outer ring of the bearing is accommodated in a bore of the housing part; an inner ring of the bearing is fitted onto the shaft; a washer stack axially delimits the ring; and the washer stack has one or more shim washers and a first holding ring.

Description

Bearing arrangement, comprising a shaft, a housing part and a bearing, and gearbox with bearing arrangement

Description:

The invention relates to a bearing arrangement, having a shaft, a housing part and a bearing, and a gearbox with a bearing arrangement.

It is generally known that shims are used to compensate for manufacturing-related tolerances.

From DE 10 2021 003 240 A1, a method for producing a transmission is known as the closest prior art.

From DE 1 298 545 A an electromechanical analog-digital converter with a planetary gear arranged between coding disks is known.

A rotary piston machine is known from EP 3 960 984 A1.

From DE 10 2021 004 971 A1 a transmission with a housing is known.

The invention is therefore based on the object of developing a transmission, whereby a robust compensation of manufacturing-related tolerances and a long service life should be achieved during operation of the transmission.

According to the invention, the object is achieved in the bearing arrangement according to the features specified in claim 1 and in the transmission according to the features specified in claim 15.

Important features of the invention in the bearing arrangement, having a shaft, a housing part and a bearing, are that a first ring, in particular an outer ring, of the bearing is received in a bore of the housing part, with a second ring, in particular an inner ring, of the bearing is attached to the shaft, wherein a disc pack axially delimits the first or second ring, in particular the inner ring or outer ring, the disc pack having a first retaining ring and one or more shims, the first retaining ring being non-rotatable or positively secured against rotation in the circumferential direction.

The advantage here is that even with variable, especially flexing, transverse forces, the disk package remains robust and thus effects the axial limitation of the bearing in the intended manner. In addition, the retaining rings bridge interruptions in the contact surface, in particular, for example, grooves that run through the contact surface. The shims are very thin and would not permanently fulfill their intended function of axial spacing or would even fail if there were interruptions in the contact surface. However, since the retaining rings hold the shims in a protective manner and the shims therefore rest continuously on the retaining rings, the service life of the shims is increased and can in particular be described as durable. Working shims into grooves that interrupt the contact surface of the shims is therefore prevented because these grooves, i.e. interruptions in the contact surfaces, are bridged by the retaining rings.

In particular, the anti-twist device prevents the disc pack from wandering around when the transverse forces fluctuate, thus ensuring a long service life.

In particular, here the axial direction is always aligned parallel to the direction of the axis of rotation of the shaft, in particular the circumferential direction and the radial direction are related to the axis of rotation of the shaft.

In an advantageous embodiment, the first retaining ring is secured against rotation in the circumferential direction or in a form-fitting manner by forming axially continuous holes in the respective retaining ring, in particular which are arranged radially outside the shims, wherein connecting elements, in particular pins, in particular notched pins, protrude through the holes, the connecting elements protruding into axial bores, in particular the axial bores being introduced into a centering collar of a cover part or into a shaft collar of the shaft, in particular wherein the holes are radially spaced from the shims, in particular, wherein the holes are in particular evenly spaced apart from one another in the circumferential direction and/or are arranged at the same radial distance. The advantage here is that a simple anti-twist protection is achieved and thus a long service life, since migration out or in is prevented, especially when the transverse force load fluctuates.

In an advantageous embodiment, the first retaining ring is secured against rotation in the circumferential direction or in a form-fitting manner, in that additionally or alternatively at least the first retaining ring, in particular on its radial outer circumference, has at least one radially directed elevation which extends into a, in particular corresponding, radially directed recess, in particular Groove, in particular axial groove, of the housing part projects into it, in particular wherein the area covered in the axial direction by the radially directed recess comprises the area covered by the disk pack in the axial direction. The advantage here is that an anti-rotation device can be achieved with little effort, i.e. the shape of the retaining ring and a first axial groove in the housing part.

However, if the first and second retaining rings of the disc pack are of identical design, a further axial groove must be provided in the housing part, which has a circumferential angular distance from the first axial groove, which corresponds to the angle of rotation of the bayonet lock. In an advantageous embodiment, adhesive is arranged in or on the disc pack, in particular to prevent rotation of the disc pack and/or the shims. The advantage here is that an anti-twist device can be implemented in a simple and cost-effective manner.

In an advantageous embodiment, the first retaining ring has a greater axial wall thickness, in particular thickness, than each of the shims. The advantage here is that the disk pack has greater rigidity than a single shim. The shims are therefore arranged in a protected manner and the disk pack can even be supported on a contact surface that is interrupted in the circumferential direction. The interruption is caused, for example, by a groove that is bridged by the disk pack.

In an advantageous embodiment, the disk pack has a second retaining ring which is connected to the first retaining ring in a form-fitting manner, in particular by means of a bayonet connection, in particular wherein the second retaining ring has a greater axial wall thickness, in particular thickness, than each of the shims, in particular wherein the shims are axially between the two retaining rings are arranged. The advantage here is that a quick and easy connection can be made in order to accommodate the shims in the washer package in a protective manner.

In an advantageous embodiment, the first retaining ring is constructed to be identical, in particular identical, to the second retaining ring. The advantage here is that only a small number of additional parts are necessary, in particular only one retaining ring. By rotating one of two previously parallel retaining rings by 180° and picking up the shims, a disk pack can be produced which, depending on the number of shims accommodated, has a different number of shims with a corresponding axial width. In an advantageous embodiment, the radial distance area covered by the respective retaining ring includes the radial distance area covered by the shims. The advantage here is that the shims can be arranged inside the disk pack and are therefore protectively surrounded by the retaining rings. In addition, the axially protruding spring areas prevent the shims from migrating radially.

In an advantageous embodiment, each of the retaining rings has axially outstanding, in particular circumferentially extending, spring regions, in particular tongue-shaped spring regions, on its radially inner edge region, in particular wherein the spring regions are connected to the remaining respective holding region at their respective front or rear end in the circumferential direction , wherein the spring regions of the first retaining ring are spaced apart from one another in the circumferential direction, wherein the spring regions of the second retaining ring are spaced apart from one another in the circumferential direction, wherein spring regions of the first retaining ring axially engage behind spring regions of the second retaining ring, in particular wherein the respective spring region of the first retaining ring protrudes in the axial direction and has a nose region that projects against the axial direction and/or wherein the respective spring region of the second retaining ring projects against the axial direction and has a nose region that projects in the axial direction, in particular wherein the spring regions are each arranged at the same radial distance and/or are evenly spaced from one another in the circumferential direction . The advantage here is that the two retaining rings can be connected to one another by means of their spring areas and thus a disk package can be formed that includes the shims. In this way, the shims are protected by the two retaining rings that are connected to each other. The contact surface of the respective shim on the respective retaining ring is designed to be uninterrupted in the circumferential direction and thus prevents failure of the respective shim.

In an advantageous embodiment, the spring areas are arranged radially within the radial distance area covered by the shims. The advantage here is that migration or radial movement of the shims is prevented, since the spring areas act as a radial limitation in the axial area covered by the shims. This is because the spring areas are arranged radially within the shims and the area covered by the spring areas in the axial direction includes the area covered by the shims in the axial direction.

The axial direction is aligned parallel to the direction of the axis of rotation of the shaft and the radial direction and the circumferential direction are related to the direction of the axis of rotation of the shaft.

In an advantageous embodiment, the area covered by the first retaining ring in the axial direction overlaps with the area covered by the second retaining ring in the axial direction. The advantage here is that the two retaining rings are connected to one another and a securely connected disk package can therefore be formed.

In an advantageous embodiment, the two retaining rings are arranged rotated by 180° relative to one another. The advantage is that only one type of retaining ring needs to be manufactured and stocked.

In an advantageous embodiment, the ring has the outer ring, the bearing arrangement having a cover part which has a centering collar which projects into the bore of the housing part, the disk pack being arranged axially between the cover part, in particular between the centering collar of the cover part, and the outer ring , in particular wherein at least one of the retaining rings has a radially outwardly projecting elevation which extends into an axial groove of the housing part, in particular into one on the Bore arranged axial groove of the housing part, protrudes. The advantage here is that the disc pack is axially limited by the cover part and is therefore fixed between the outer ring and the cover part. The cover part, with its centering collar protruding into the bore, defines an axial position at which the disk pack rests. Since this position can be different due to the manufacturing process, the choice of the number and axial thickness of the shims makes it possible to compensate for the axial width of the disk pack, so that the outer ring of the bearing can be limited to the intended axial position.

In an advantageous embodiment, the ring is the inner ring, with the disk pack being arranged axially between a shaft collar of the shaft and the inner ring of the bearing, in particular with at least one of the retaining rings having a radially inwardly projecting elevation which projects into an axial groove of the shaft. The advantage here is that the axial position of the shaft collar is different and the axial position intended for the inner ring is therefore made possible by selecting the number and axial thickness of the shims. In addition, positive anti-twist protection can be achieved simply by shaping and inserting the axial groove.

In an advantageous embodiment, the area covered by the axial groove in the axial direction includes the area covered by the disk pack in the axial direction. The advantage here is that the anti-twist protection is made possible in a simple manner.

In an advantageous embodiment, adhesive is arranged in or on the pane package. The advantage here is that additional security can be provided.

In an advantageous embodiment, the shims are designed as perforated disks, in particular the axial thickness of the shims is smaller than the axial thickness of the retaining rings. The advantage here is that the retaining rings stiffen the disk pack and thus also enable bridging of circumferentially formed interruptions in the respective contact surface of the respective retaining ring on the side facing away from the shims. In an advantageous embodiment, axially continuous holes are formed in the respective retaining ring, in particular which are arranged radially outside the shims, with connecting elements, in particular pins, in particular pins, protruding through the holes, with the connecting elements protruding into axial bores, in particular with the holes in the circumferential direction are in particular evenly spaced from one another and/or are arranged at the same radial distance. The advantage here is that anti-twist protection using pins can be achieved in a simple and cost-effective manner.

In an advantageous embodiment, the ring is the outer ring, with the axial bores arranged in the cover part, in particular with the axial bores being arranged as blind bores. The advantage here is that the anti-twist device can be anchored in the cover part. This means that no hole has to be drilled in the bearing, especially in the outer ring. The cover part is connected to the housing part accommodating the bearing by means of axially directed connecting screws and is therefore connected so that it cannot rotate.

In an advantageous embodiment, the ring is the inner ring, with the axial bores being introduced into the shaft, in particular into the shaft collar of the shaft, in particular as blind bores. The advantage here is that the shaft collar has sufficient material strength to make the holes. This then makes a very compact design possible.

Important features of the transmission with a particularly aforementioned bearing arrangement are that the shaft is connected in a rotationally fixed manner to a toothed part.

The advantage here is that the shaft is a transmission shaft, in particular an input shaft, an intermediate shaft or an output shaft. The shaft is arranged to be protected from the environment at the axial end facing the cover part. Further advantages result from the subclaims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, further sensible combination options of claims and/or individual claim features and/or features of the description and/or the figures arise, in particular from the task and/or the task posed by comparison with the prior art.

The invention will now be explained in more detail using schematic illustrations:

1 shows a sectioned bearing arrangement of a transmission according to the invention in an oblique view, with a disk pack 1 being arranged on a bearing of the transmission.

In Figure 2, a retaining ring 20 of the disk pack 1 is shown in an oblique view.

In Figure 3, two such retaining rings 20 are shown in an oblique view.

In Figure 4, the disk package is shown exploded in an oblique view, with an area of the exploded disk package being shown schematically and enlarged.

In Figure 5, an area of the disk pack 1 is shown in an oblique view before assembly.

In Figure 6, an area of the disk pack 1 is shown in an oblique view after assembly.

As shown in the figures, a bearing for rotatably supporting a shaft 7 is accommodated in the housing part 3. In particular, the outer ring 4 of the bearing is accommodated in a through hole in the housing part 3 and the inner ring 6 is plugged onto the shaft 7. Rolling elements 5 are arranged between the inner ring 6 and the outer ring 4.

The inner ring 6 rests on a step of the shaft 7 and is therefore axially limited relative to the shaft 7.

A cover part 2 covers the hole towards the surroundings and lies against the housing part 3 for this purpose. In particular, screws passing through the cover part 2, the threaded areas of which are screwed into threaded holes in the housing part 3, push the cover part 2 towards the housing part 3 with their screw heads. A centering collar of the cover part 2 protrudes into the hole. The outer ring 4 is axially limited by a disk pack 1 arranged axially between the outer ring 4 of the bearing and the cover part 2.

The axial limitation is determined by means of the axial thickness of the disk pack 1.

As shown in Figures 2 to 6, the disk pack 1 has shims 40, which are received axially on both sides by retaining rings 20 that can be connected to one another.

The shims 40 are designed as perforated disks and each have the same outside diameter and the same clear inside diameter. The axial thickness, in particular wall thickness, of the shims 40 may be the same or different. The thickness preferably has a value in the range from one tenth to five tenths of a millimeter, i.e. 0.1 mm to 0.5 mm.

As shown in Figure 4, several shims are arranged axially between the two retaining rings 20, so that the outer ring is axially limited depending on the number and the axial thickness of the shims 20.

The retaining rings 40 preferably have a greater axial thickness than the shims. The retaining rings 40 are then more stable and/or stiffer than the shims 20.

The retaining rings 40 have a smaller clear inside diameter than the shims 40.

The retaining rings 40 have a larger outer diameter than the shims 40.

Preferably at a greater radial distance than the largest radial distance of the shims 40, the retaining rings 40 have axially through holes 22 spaced apart from one another in the circumferential direction, through which notched pins 8 are passed, which protrude into axial bores of the cover part 2 and through the holes of the two retaining rings 40 of the Disc pack 1 protrude through. The disk pack 1 is thus secured against rotation relative to the cover part 2. The two retaining rings 20 of the disc pack 1 are identical in construction, in particular identical to one another, although they are arranged in the disc pack 1 rotated by 180 ° to one another.

Each retaining ring 20 has spring regions 21 spaced apart from one another in the circumferential direction on its radial inner edge region. The respective spring area is designed as a bending area and extends more in the circumferential direction than in the axial direction.

The respective spring region 21 is shaped as a tongue extending in the circumferential direction, which projects slightly axially on the retaining ring 20.

The first spring region 21 of a first retaining ring 40 can therefore be elastically deflected in the axial direction when a second spring region 21 of the second retaining ring 40 is pushed behind the first spring region 21 in the circumferential direction. The second spring region 21 of the second retaining ring 20 then engages under the first spring region 21 of the first retaining ring 20.

To improve threading when gripping underneath, each spring area 21 has an insertion bevel.

This positive connection caused by relative rotation of the two retaining rings 40 can also be referred to as a bayonet connection, in particular where the first retaining ring 40 functions as a first bayonet locking part and the second retaining ring 40 functions as a second bayonet locking part.

In particular, the respective spring area 21 is formed and shaped by punching and bending. In particular, the spring region 21 is designed to be coherent with the remaining retaining ring 40, i.e. in one piece and/or in one piece.

As a result of this mutual engagement of the spring regions 21 of the two retaining rings 40, the shims 20 arranged between the retaining rings 40 are axially limited and enclosed in a shaping manner. Bending individual shims 20 is not possible. In addition, the shims 20 lie without gaps, particularly uninterrupted in the circumferential direction.

Radial migration of the shims is prevented due to the respective spring regions 21, which are distributed around the circumference and protrude axially from the other retaining ring.

The first retaining ring 40 rests on the outer ring of the bearing and the second retaining ring 40 rests on the cover part 2. However, the contact surface of the second retaining ring 40 on the cover part 2 is not continuous in the circumferential direction, but rather interrupted, so that the bearing is well supplied with oil and the heated oil gives off heat on the inside of the cover part 2, in particular for dissipation from the cover part 2 to the environment .

Since the second retaining ring 40 has a sufficient wall thickness, it bridges the interruption and thus brings about a stable alignment of the disk pack 1 and a constant axial positioning even under load.

The disk package 1 can be manufactured pre-completed. It is therefore designed to be movable, storable and transportable as a unit.

In further exemplary embodiments according to the invention, in addition to or as an alternative to the notch pins 8, a form-fitting anti-rotation device is provided, which is brought about by at least one radial elevation of a retaining ring 20 which projects into a corresponding recess, in particular a groove, in the housing part 3.

The groove is preferably designed as an axial groove on the inside of the bearing bore, i.e. the bore of the housing part that accommodates the outer ring of the bearing.

The area covered by the groove in the axial direction includes the area covered by the disk pack 1 in the axial direction.

The radial elevation can be achieved, for example, by a radially projecting nose region of the retaining ring 20. In further exemplary embodiments according to the invention, additionally or alternatively

Adhesive is provided in and/or on the disc pack 1, in particular as an anti-twist device.

In further exemplary embodiments according to the invention, instead of the notched pins 8, other connecting elements, such as screws, rivets, clamping sleeves or pins different from notched pins 8, are used.

In further exemplary embodiments according to the invention, the disk pack 1 is plugged onto the shaft, with the disk pack 1 being arranged axially between the inner ring of the bearing and the shaft collar of the shaft. Thus, the axial position at which the inner ring is limited is defined by the disk pack 1. For positive anti-twist protection, the notch pins 8 are inserted into axial bores which are introduced into the shaft on the shaft collar, and/or at least one of the two retaining rings 40 has a radially inwardly directed elevation, in particular a radially inwardly projecting nose region, this elevation, in particular this nose area, protrudes into an axial groove of the shaft.

In further exemplary embodiments according to the invention, the disc pack 1 is equipped with only a single retaining ring, so that the shims 40 rest axially between the cover part 2 and the retaining ring 20, which in turn rests on the outer ring 4. Alternatively, the retaining ring can also be placed on the cover part in order to bridge a groove in the contact surface, and the shims are accommodated in the retaining ring 20. The outer ring 4 then lies against one of the shims. In both alternatives, pins and/or radial elevations can also be provided in the above-mentioned manner to prevent rotation.

Reference symbol list

1 disc pack 2 cover part

3 Housing part, in particular bearing flange or end shield

4 outer ring

5 rolling elements

6 inner ring 7 shaft

8 notch pin

20 retaining ring

21 spring area

22 through hole 40 shim

Claims

Patent claims:

1. Bearing arrangement, comprising a shaft, a housing part and a bearing, wherein a first ring, in particular an outer ring, of the bearing is received in a bore of the housing part, with a second ring, in particular an inner ring, of the bearing being slipped onto the shaft, characterized in that a disc pack axially delimits the first or second ring, in particular the inner ring or outer ring, the disc pack having a first retaining ring and one or more shims, the first retaining ring being non-rotatable or positively secured against rotation in the circumferential direction, in particular the axial direction is aligned parallel to the direction of the axis of rotation of the shaft, in particular wherein the circumferential direction and the radial direction are related to the axis of rotation of the shaft.

2. Bearing arrangement according to claim 1, characterized in that the first retaining ring rotates in the circumferential direction or is positively secured against rotation by forming axially continuous holes in the respective retaining ring, in particular which are arranged radially outside the shims, with connecting elements, in particular pins, in particular notched pins, protrude through the holes, with the connecting elements protruding into axial bores, in particular with the axial bores being made in a centering collar of a cover part or in a shaft collar of the shaft, in particular with the holes being spaced radially from the shims, in particular with the holes from one another in the circumferential direction, particularly evenly , are spaced apart and / or are arranged at the same radial distance.

3. Bearing arrangement according to claim 1 or 2, characterized in that the first retaining ring rotates in the circumferential direction or is positively secured against rotation by additionally or alternatively at least the first retaining ring, in particular on its radial outer circumference, having at least one radially directed elevation which is in a, in particular corresponding, radially directed recess, in particular groove, in particular axial groove, of the housing part projects into it, in particular wherein the area covered in the axial direction by the radially directed recess comprises the area covered by the disk pack in the axial direction.

4. Bearing arrangement according to one of the preceding claims, characterized in that adhesive is arranged in or on the disc pack, in particular to prevent rotation of the disc pack and / or the shims.

5. Bearing arrangement according to one of the preceding claims, characterized in that the disk pack has a second retaining ring which is positively connected to the first retaining ring, in particular by means of a bayonet connection, in particular wherein the second retaining ring has a greater axial wall thickness, in particular thickness, than each the fitting washers, in particular wherein the fitting washers are arranged axially between the two retaining rings and/or wherein the area covered by the fitting washers in the axial direction is encompassed by the area covered by the first retaining ring and/or by the second retaining ring in the axial direction, in particular wherein the radial spacing region covered by the shims is encompassed by the radial spacing region covered by the first retaining ring and/or by the second retaining ring.

6. Bearing arrangement according to one of the preceding claims, characterized in that the first retaining ring has a greater axial wall thickness, in particular thickness, than each of the shims, and / or that the first retaining ring is designed to be identical, in particular identical, to the second retaining ring, and / or that the radial distance area covered by the respective retaining ring includes the radial distance area covered by the shims.

7. Bearing arrangement according to one of the preceding claims, characterized in that each of the retaining rings has axially outstanding, in particular circumferentially extending, spring regions, in particular tongue-shaped spring regions, on its radially inner edge region, in particular wherein the spring regions are at their respective front or rear in the circumferential direction End are connected to the remaining respective holding region, the spring regions of the first retaining ring being spaced apart from one another in the circumferential direction, the spring regions of the second retaining ring being spaced apart from one another in the circumferential direction, with spring regions of the first retaining ring engaging axially behind spring regions of the second retaining ring, in particular wherein the respective spring region of the first retaining ring protrudes in the axial direction and has a nose region protruding against the axial direction and / or wherein the respective spring region of the second retaining ring protrudes against the axial direction and has a nose region protruding in the axial direction, in particular wherein the spring regions are each arranged at the same radial distance and / or are evenly spaced from one another in the circumferential direction.

8. Bearing arrangement according to one of the preceding claims, characterized in that the spring areas are arranged radially within the radial distance area covered by the shims.

9. Bearing arrangement according to one of the preceding claims, characterized in that the area covered by the first retaining ring in the axial direction overlaps with the area covered by the second retaining ring in the axial direction and / or that the two retaining rings are arranged rotated by 180 ° relative to one another.

10. Bearing arrangement according to one of the preceding claims, characterized in that the ring is the outer ring, the bearing arrangement having a cover part which has a centering collar which projects into the bore of the housing part, the disk pack being axially between the cover part, in particular between the Centering collar of the cover part, and the outer ring is arranged, in particular

- wherein the contact surface between the cover part, in particular the centering collar, and the disc pack is interrupted in the circumferential direction, in particular by a radially continuous groove, in particular for supplying lubrication to the bearing, the cover part, and/or at least one of the retaining rings has an elevation which projects radially outwards, which projects into an axial groove of the housing part, in particular into an axial groove of the housing part arranged on the bore.

11. Bearing arrangement according to one of the preceding claims, characterized in that the ring is the inner ring, the disk pack being arranged axially between a shaft collar of the shaft and the inner ring of the bearing, in particular wherein at least one of the retaining rings has an elevation projecting radially inwards, which protrudes into an axial groove of the shaft.

12. Bearing arrangement according to one of the preceding claims, characterized in that the area covered by the axial groove in the axial direction includes the area covered by the disk pack in the axial direction.

13. Bearing arrangement according to one of the preceding claims, characterized in that the shims are designed as perforated disks, in particular wherein the axial thickness of the shims is smaller than the axial thickness of the retaining rings.

14. Bearing arrangement according to one of the preceding claims, characterized in that the ring is the outer ring, with the axial bores being arranged in the cover part, in particular with the axial bores being arranged as blind bores, or that the ring is the inner ring, with the axial bores in the shaft , in particular in the shaft collar of the shaft, are introduced, in particular as blind holes.

15. Gearbox with bearing arrangement according to one of the preceding claims, characterized in that the shaft is rotatably connected to a toothed part.