rolling bearing device

Abstract

A rolling bearing device comprising a first surface area (12) on an inner rolling bearing ring (18), which further comprises a running surface (20), and a second surface area (10) on an outer rolling bearing ring (30) of the rolling bearing device, which form a gap (14), with at least one sealing unit (16) which is arranged at least partially between the first and the second surface areas (12, 10) and seals the gap (14), wherein the sealing unit (16) comprises at least one felt element (22) which is arranged partially in a groove (38) of the outer rolling bearing ring (30), wherein the sealing unit (16) is a ring of felt which, in an unassembled state, has a rectangular cross-section, wherein the extension length of the groove (38) widens in the axial direction of the bearing starting from the base of the groove (38), so that the felt element is axially compressed in the region of the groove base and thereby in a Condition,in which the inner bearing ring (18) is at rest relative to the outer bearing ring (30), is pressed against the first surface area (12) and bears against it, and in an operating state in which the outer bearing ring (30) rotates relative to the inner bearing ring (18), is arranged at a distance from the first surface area (12).

Description

[0001] The invention relates to a rolling bearing device with a gap and a sealing unit which is intended to seal the gap.

[0002] A device with a double-row, grease-lubricated tapered roller bearing is known. The device has a gap that leads to an interior region of the tapered roller bearing. The device has a non-contact seal that is mounted far from the bearing and seals against an axle part. The seal is designed either as a labyrinth seal or as a felt ring seal. The seal is only attached relative to the bearing at the device's final location of use. Furthermore, a sealing unit of the device can be designed as an alternative to the seal as a sealing unit that permanently rests against its mating surface even during operation of the tapered roller bearing in which components of the bearing move relative to one another.

[0003] DE 11 85 867A teaches a split race of a multi-row cylindrical roller bearing, provided with ribs at both ends. US 2 015 206 A teaches an antifriction bearing with a grease retaining agent. FR 2 621 970 A1 teaches a dynamic sealing device using a centrifugal body, which allows a seal to be created between two adjacent housings. The standard DIN 54192010-05-00, entitled "Rolling bearings - Seals for rolling bearings - Dimensions for felt rings and felt strips," describes details on the sealing of rolling bearings.

[0004] The object of the invention is, in particular, to provide a generic rolling bearing device with high efficiency. This object is achieved according to the invention by the features of patent claim 1, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0005] A rolling bearing device is proposed with a first and a second surface region forming a gap, with at least one sealing unit arranged at least partially between the first and second surface regions and sealing the gap, and with at least one bearing component having a running surface and the first surface region. The sealing unit has at least one felt element that at least contributes to sealing the gap. This allows for high efficiency. In particular, low manufacturing costs can be achieved and a long tolerance chain can be avoided.Furthermore, it can be achieved in particular that when a bearing is delivered which has the rolling bearing device, the gap is already protected against the ingress of dirt by the sealing unit, so that protective measures against contamination during delivery, which are necessary if a permanent contamination protection of the gap which is not part of the bearing is only mounted after delivery, can be omitted.

[0006] Preferably, the bearing component is formed as a single piece. "Single piece" is understood to mean, in particular, a single casting and / or injection molding and / or a component that can only be separated by destruction. This allows for a structurally simple design.

[0007] It is further proposed that the bearing component be a rolling bearing inner ring. This makes it possible to achieve a mating surface of the felt element being a surface of a bearing ring and, in particular, being formed by a bearing shoulder, thus avoiding additional precision machining with regard to concentricity and surface quality by the manufacturer of the mating surface, because the surface of the bearing ring is already produced by such machining.

[0008] Advantageously, during an operating process in which the first surface area moves relative to the second surface area, the sealing unit is arranged at a distance from the first surface area. This prevents wear and prevents heating due to friction between the sealing unit and the first surface area.

[0009] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations. Fig. 1 shows a partial section through part of a bearing with a rolling bearing device according to the invention.

[0010] Fig.Figure 1 shows a partial section through a portion of a grease-lubricated, double-row tapered roller bearing with a rolling bearing device according to the invention. The rolling bearing device comprises a rolling bearing inner ring 26, a rolling bearing outer ring 28, and a component 30 that is fastened to the rolling bearing outer ring. The integrally formed rolling bearing inner ring 26 comprises a first surface region 12, which, together with a second surface region 10, which is a surface of the component 30, forms a gap 14. The first surface region 12 is part of a shoulder 24 of the rolling bearing inner ring 26.

[0011] A first sealing unit 16 of the rolling bearing device is formed by a ring of felt and is arranged between the first and second surface regions 12, 10, partially in a groove 38 of the component 30. In a state in which the rolling bearing inner ring 26 is at rest relative to the rolling bearing outer ring 28, the sealing unit 16 bears against the first surface region 12. During an operating process in which the rolling bearing outer ring rotates relative to the rolling bearing inner ring, the sealing unit 16 is arranged at a distance from the first surface region 12. In this state and during the operating process, the sealing unit 16 seals the gap 14. During the operating process, the sealing unit and the first surface region form a minimal gap seal.

[0012] A bearing component 18, which is formed by the rolling bearing inner ring 26, has a running surface 20 for rolling rolling elements 40.

[0013] The extension length of the groove 38 in the axial direction of the bearing widens from the groove base of the groove 38 in the radial direction of the bearing toward the rotational axis 42 of the bearing. When the sealing unit 16 is unassembled, the felt ring has a rectangular cross-section. When assembled, the felt ring is compressed in the area of ​​the groove base and is thereby pressed against the first surface area 12. The first surface area is ground.

[0014] Due to the sealing unit's proximity to the interior of the bearing, which is protected by the sealing unit, tolerance chains are reduced. Furthermore, the sealing unit prevents grease leakage.

[0015] Furthermore, the sealing unit 16 is arranged at a first axial end region 32 of the rolling bearing device. The rolling bearing device has a further sealing unit 34, which is fastened to a component 44 that is fixed to the rolling bearing outer ring. Another rolling bearing inner ring 46, the component 44, and the rolling bearing outer ring are arranged relative to one another in the same way as the rolling bearing inner ring 26, the component 30, and the rolling bearing outer ring. Furthermore, the components 30 and 44 and the rolling bearing inner rings 26, 46 are structurally identical. Furthermore, the sealing units 16 and 34 are structurally identical. The sealing unit 34 is arranged at a second axial end region 36 of the rolling bearing device, which is opposite the first axial end region 32. List of reference symbols 10 Surface area 12 Surface area 14 gap 16 Sealing unit 18 Bearing component 20 tread 22 felt element 24 Shoulder 26 Rolling bearing inner ring 28 Rolling bearing outer ring 30 components 32 End area 34 Sealing unit 36 End area 38 grooves 40 rolling elements 42 axis of rotation 44 component 46 rolling bearing inner ring

Claims

[1] Rolling bearing device, with a first surface area (12) on a rolling bearing inner ring (18), which further has a running surface (20), and a second surface area (10) on a rolling bearing outer ring (30) of the rolling bearing device, which form a gap (14), with at least one sealing unit (16), which is arranged at least partially between the first and the second surface area (12, 10) and seals the gap (14), wherein the sealing unit (16) has at least one felt element (22), which is arranged partially in a groove (38) of the rolling bearing outer ring (30), wherein the sealing unit (16) is a ring made of felt, which in an unassembled state has a rectangular cross-section, wherein the extension length of the groove (38) widens in the axial direction of the bearing starting from the groove base of the groove (38), so that the felt element in the region of the groove base axially compressed and thus in a statein which the rolling bearing inner ring (18) rests relative to the rolling bearing outer ring (30), is pressed against the first surface region (12) and bears against it, and in an operating state in which the rolling bearing outer ring (30) rotates relative to the rolling bearing inner ring (18), is arranged at a distance from the first surface region (12). [2] Rolling bearing device according to claim 1, wherein the rolling bearing inner ring (18) is formed in one piece. [3] Rolling bearing device according to one of the preceding claims, wherein a shoulder (24) of the rolling bearing inner ring has the first surface region (12). [4] Rolling bearing device according to one of the preceding claims, wherein the sealing unit (16) is arranged at a first axial end region (32) of the rolling bearing device and the rolling bearing device has a further sealing unit (34) with at least one part made of felt and the further sealing unit (34) is arranged at a second axial end region (36) of the rolling bearing device, which is opposite the first axial end region (32). [5] Bearing with a rolling bearing device according to one of claims 1 to 4. [6] Bearing according to claim 5, wherein the bearing is a grease-lubricated and / or double-row tapered roller bearing.

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