Bearing ring with sealing disk

Abstract

The present invention relates to a bearing, in particular to a self-aligning roller bearing with a fastener of a sealing disc, which fastener increases the load-bearing strength. According to the invention, the bearing comprises a bearing ring, the bearing ring having an annular sealing disc, the annular sealing disc being connected to one of the two bearing ring end faces by means of a fastening device, the fastening device having a shank and a head with an enlarged diameter relative to the shank, and the respective shank passing through a hole formed in the respective end face. Here, the annular surface has a cylindrical profile, as a result of which the other annular surface provides a raceway, wherein the raceway has a spherical profile, and the hole central axis of each hole in the bearing ring and the sealing disc has an inclined course extending towards the cylindrical profile of the annular surface.

Description

Technical Field

[0001] The present invention relates to bearings, and in particular, to a self-aligning roller bearing having a sealing disk fastener that increases load-bearing strength. Background Art

[0002] From the prior art known bearing rings with different recesses for accommodating bearing seals. In addition, for specific requirements, screw fasteners for seals are known for special types of bearings, such as spherical roller bearings or self-aligning roller bearings.

[0003] EP 2 729 712 B1 discloses a spherical roller bearing for a fin stabilizer on a ship, which represents a sealing device screwed onto a bearing ring for lateral sealing of a rolling element chamber. It is characterized in that the spherical roller bearing has a second sealing section arranged on the sealing support section. However, only the screw arrangement of the seal parallel to the outer contour of the roller bearing is shown here.

[0004] DE 10 2007 036 891 A1 discloses a bearing for a main shaft of a wind turbine, wherein the bearing comprises at least one spherical roller bearing. A sealing device for sealing a chamber accommodating the rollers of the spherical roller bearing is arranged directly on a ring in the spherical roller bearing. The sealing device is inserted into the outer ring and is designed to be corrugated in a longitudinal section along the axis of rotation.

[0005] DE 60306638 T2 relates to a sealed spherical roller bearing for a swivel shaft of a towed excavator. The side of the spherical roller bearing has a contact lip seal support, which carries a contact lip seal, wherein the contact lip seal support is screwed to the outer ring of the spherical roller bearing. The contact lip seal forms a sealing area for sealing the rolling element chamber together with a seal support ring arranged adjacent to the inner ring. Summary of the invention

[0006] The invention is based on the object of providing a roller bearing which is further developed compared to the prior art and has a fastening device for the screwed sealing disk which is improved with regard to the load-bearing strength.

[0007] In roller bearings with bearing rings and rolling elements with spherical profiles, such as self-aligning roller bearings, the distance between the seal fastening threaded holes and the raceway is usually very small. As a result, the load-bearing strength in these areas is severely limited. In addition, during heat treatment, such as during induction hardening, such an asymmetrical design of the fastening holes, i.e. not parallel to the rolling element axis, can lead to stress cracks during the cooling process. So far, this could only be counteracted by using particularly strong bearing rings or lower hardening depths, which requires a lot of material and installation space.

[0008] According to the invention, this object is achieved by a bearing ring according to claim 1. The bearing ring comprises an outer annular surface and an inner annular surface, two end faces and an annular sealing disk connected to one of the two end faces, wherein the fastening device has a shank and a head with an enlarged diameter relative to the shank, and the respective shank passes through a hole formed in the respective end face and in the sealing disk connected to the respective end face, wherein the annular surface has a cylindrical profile so that the other annular surface provides a raceway, wherein the raceway has a spherical profile and the hole central axis of each hole in the bearing ring and the sealing disk has an inclined course extending towards the cylindrical profile of the annular surface.

[0009] In a preferred embodiment, the radial distance A between the central axis of the bore and the spherical profile is substantially of the same size. This has the advantage that the distance between the bore center and the rolling element raceway is substantially the same and the stress distribution is therefore particularly uniform. This is also advantageous with regard to internal stresses that occur in the component before the optional hardening process and during use. The bearing ring is preferably an outer ring or an inner ring of a roller bearing.

[0010] In an advantageous embodiment, screws are used as fastening means, wherein the holes in the side surface of the respective bearing ring are threaded holes. It is also conceivable that bolts or rivets are provided as fastening means.

[0011] It is further preferred if the holes in the sealing disk are provided with collars which extend radially with respect to the hole central axis and form an angle of 90° with the hole central axis, the collars dividing each hole into a first section with a large hole diameter and a second section with a smaller hole diameter.

[0012] The solution to the problem according to the invention is particularly preferred for use with self-aligning roller bearings, since according to the current prior art these bearings, due to their structure through the bores parallel to the lateral outer ring surface, are weakened during the hardening process and during use due to a loss of load-bearing strength of the raceways. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Preferred embodiments of the present invention are explained in more detail below with reference to the accompanying drawings.

[0014] In the attached picture:

[0015] Figure 1 shows a schematic longitudinal section through a self-aligning roller bearing as an exemplary embodiment of the invention;

[0016] Figure 2 shows a schematic longitudinal section through a self-aligning roller bearing as a further exemplary embodiment of the invention;

[0017] Figure 3 A cross section through the hole region is shown, illustrating the present invention;

[0018] Figure 4 A cross section through the hole region is shown, illustrating another exemplary embodiment. DETAILED DESCRIPTION

[0019] exist Figure 1 In the figure, a self-aligning roller bearing 1 is shown in a schematic longitudinal sectional view along the axis of rotation 2 of the self-aligning roller bearing 1. The self-aligning roller bearing has an inner ring 3 and an outer ring 4, which together form a rolling element chamber 5, in which two rows of rolling elements 6 are arranged in a cage 7. The rolling elements 6 are designed as cylindrical rollers. The inner ring 3 is designed as a solid one-piece ring and has an integral and / or molded central edge 8 and two integral and / or molded lateral edges 9. The raceway for the rolling elements 6 extends between the central edge 8 and the lateral edges 9. The outer ring 4 is also formed in one piece and has a common raceway 10 of hollow spherical shape for the rolling elements 6. Due to the geometry of the rollers and the geometry of the raceways, the self-aligning roller bearing 1 is able to compensate for misalignments by tilting the inner ring 3 and the outer ring 4. In the center of the outer ring 4 there is a lubrication hole 11, which allows grease to be pressed into the rolling element chamber 5. In each case, a sealing device 11 is arranged on the end face, which seals the rolling element chamber 5 relative to the environment. The sealing device 11 includes a sealing support section 12, which is designed as an annular disk or has a corresponding section and extends from the radial outside of the outer ring 4 into the rolling element chamber 5. In addition to the sealing receiving portion, the sealing support section is designed to be planar or flat. The elastomer that seals the inside of the bearing can be located on the radial inner edge of the sealing support section 12. It is also conceivable that different sealing materials are provided. For example, the seal can be made entirely or partially of an elastomer, reinforced with metal or made entirely of a metal material. This will be based on the embodiment of the centrifugal disk. The sealing support section 12 is oriented so that it prevents contaminants from penetrating from the outside, while allowing grease to escape, for example, when fresh grease is pressed into the lubrication hole 13.

[0020] The free end of the seal bearing section 12 can be radially resting on the inside of the lateral edge 9 or resting at a short distance from the escape of grease during relubrication. It is also conceivable that a labyrinth-like configuration of the seal bearing section is provided in the area of ​​relative movement. The seal bearing section 12 can be rigidly made, in particular made of metal, such as steel, as an elastomer-metal composite or as a polymer, and has a material thickness of at least 0.5 mm, preferably at least 2 mm, so that the selection of materials, material thickness and structural distribution produces a very rigid structure. In the axial extension along the axis of rotation 2, the outer ring 4 is designed to be narrower than the inner ring 3 or has a corresponding recess. The recessed axial area is occupied by the sealing device 11, so that the self-aligning roller bearing 1 ends flush with the inner ring 3 in the axial direction. By reducing the axial extent of the outer ring 4, the self-aligning roller bearing 1 can be replaced with another bearing having the same axial dimensions as the inner ring 3, because the self-aligning roller bearing 1 is designed to require no additional installation space.

[0021] In order to fixedly attach the seal 11, in particular the seal support section 12, to the outer ring 4, the self-aligning roller bearing 1 has a peripheral row of cylindrical fastening means 14, which are inserted through openings in the seal support section 12 into holes 15 in the outer ring 4. In order to achieve easy disassembly, for example for inspection, screws engaging in corresponding threaded holes in the bearing ring are suitable as fastening means. However, other designs, such as bolts, are also conceivable.

[0022] In the axially outer region, the seal bearing segment 12 rests partly in a region provided for this purpose or over its entire surface on the end face of the outer ring 4. The bore central axis of each bore in the bearing ring and the sealing disk has an inclined course extending toward the cylindrical profile of the annular surface. This allows the bearing strength of the raceway to be increased compared to the designs known in the prior art. The radial distance A between the bore central axis and the spherical profile is essentially of the same size, which according to the invention has the advantage that, due to the same wall thickness in the raceway region, there is particularly uniform cooling during the hardening process and therefore the tendency to cracks is particularly low.

[0023] The illustration also shows that the holes in the sealing disk are provided with collars 16 extending radially and forming an angle of 90° with respect to the hole central axis, which divides each hole into a first section with a large hole diameter and a second section with a smaller hole diameter.

[0024] Figure 2A further embodiment of the invention is shown in which the fastening of the seal bearing section 12 is located on the inner ring of the roller bearing. This is particularly suitable for applications in which splashes or condensation can form inside the bearing or in which media cannot be avoided from the environment. Due to the design shown, this media does not collect in the lower region of the bearing between the inner ring and the seal, but can escape again on the lower side under the effect of gravity.

[0025] Figure 3 An embodiment of a sealing disk fastener is shown in a detailed cross-sectional view. It shows a collar extending radially relative to the bore central axis and forming an angle of 90° with the bore central axis, thereby dividing each bore into a first section with a large bore diameter and a second section with a smaller bore diameter.

[0026] Figure 4 A further embodiment of a sealing disk fastening is shown in a detailed sectional view, in which the sealing device 11 rests on a sealing disk support section 12 in a recess on the outer ring 4 .

[0027] Reference numerals list

[0028] 01 Bearing

[0029] 02 Rotation axis

[0030] 03 Inner Ring

[0031] 04 Outer Ring

[0032] 05 Rolling Element Chamber

[0033] 06 Rolling elements

[0034] 07 Cage

[0035] 08 Central edge

[0036] 09 Lateral edge

[0037] 10 Rollerway

[0038] 11 Sealing device

[0039] 12 Seal support section

[0040] 13 Lubrication hole

[0041] 14 Cylindrical fastening device

[0042] 15 holes

[0043] 16 Ring

Claims

1. A bearing ring of a roller bearing, the bearing ring comprising an outer annular surface and an inner annular surface, two end faces, and an annular sealing disk connected to one of the two end faces, wherein: The fastening device has a shank and a head having an enlarged diameter relative to the shank, and the respective shank passes through a hole formed in the respective end face and a sealing disk connected to the respective end face, It is characterized in that The outer annular surface or the inner annular surface has a cylindrical profile, The other annular surface provides a raceway, wherein the raceway has a spherical profile, And the hole central axis of each hole in the bearing ring and the sealing disk has an inclined course extending toward the cylindrical contour of the annular surface.

2. The bearing ring according to claim 1, It is characterized in that The radial distance A between the bore central axis and the spherical profile is substantially of the same size.

3. The bearing ring according to claim 1 or 2, It is characterized in that The bearing ring is the outer ring or the inner ring of a roller bearing.

4. The bearing ring according to claim 1 , It is characterized in that The fastening means is a screw, and The holes in the side surfaces of the respective bearing rings are threaded holes.

5. The bearing ring according to any one of claims 1 or 2, It is characterized in that The holes in the sealing disk are provided with collars extending radially relative to the hole central axis and forming an angle of 90° with the hole central axis, the collars dividing each hole into a first section with a large hole diameter and a second section with a smaller hole diameter.

6. A self-aligning roller bearing comprising a bearing ring according to any one of claims 1 to 5.

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