DE102020117848A1 - roller bearing arrangement - Google Patents

Abstract

The invention relates to a roller bearing arrangement (1), comprising a roller bearing (2) with an inner ring (3), an outer ring (4) and rolling bodies (5), the inner ring (3) having an inner ring raceway (6) and the outer ring (4 ) has an outer ring raceway (7), the rolling elements (5) being mounted in a rolling manner between the inner ring (3) and the outer ring (4), the rolling bearing (2) also having a seal (8) which is between the inner ring (3) and the outer ring (4) is arranged to extend in the radial direction, the inner ring (3) having a wedge-shaped inner ring rim (9) pointing radially inward into the roller bearing (2) and/or the outer ring (4) having a wedge-shaped point radially inward into the roller bearing (2) directed outer ring rim (10), and the seal (8) comprises a first sealing lip (11) which, on the side of the wedge-shaped inner ring rim (9) and/or second sealing lip (12 ) outer ring flange (10) and the seal (8 ) has at least one second sealing lip (12) which is supported on a radially extending section (13) of the inner ring (3) and/or the outer ring (4) which is on the side of the wedge-shaped inner ring rim ( 9) and/or outer ring rim (10) opposite in the axial direction.

Description

The invention relates to a roller bearing arrangement, comprising a roller bearing with an inner ring, an outer ring and roller bodies, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the roller bodies being arranged in a rolling manner between the inner ring and the outer ring, the roller bearing also having a seal , which is arranged to extend in the radial direction between the inner ring and the outer ring.

Rolling bearing assemblies are well known from the prior art. There is a continuing need to improve the sealing properties of roller bearings, especially when they are exposed to a high level of dirt or water.

It is therefore the object of the invention to provide a roller bearing arrangement which is improved in terms of its sealing properties.

This object is achieved by a roller bearing arrangement comprising a roller bearing with an inner ring, an outer ring and roller bodies, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the roller bodies being arranged in a rolling manner between the inner ring and the outer ring, the roller bearing also having a seal which is arranged between the inner ring and the outer ring so as to extend in the radial direction, the inner ring having a wedge-shaped inner ring rim pointing radially inward of the roller bearing and/or the outer ring having a wedge-shaped outer ring rim pointing radially inward of the roller bearing, and the seal has a first comprises a sealing lip which rests against the side of the wedge-shaped inner ring rim and/or second sealing lip outer ring rim facing away from the interior of the roller bearing and the seal has at least one second sealing lip which is located on a radially extending section of the inner ring and /or the outer ring which is opposite the side of the wedge-shaped inner ring rim and/or outer ring rim facing the inside of the roller bearing in the axial direction.

In this way, in particular, a high sealing effect against the ingress of water, for example from a high-pressure cleaner, can be implemented. This will be discussed in more detail based on the explanations for the exemplary embodiment.

First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are mentioned in the set of claims, and particularly preferred configurations of the subject matter of the invention are described below.

Rolling bearings can be used in particular to enable rotary movements with the lowest possible friction losses. Rolling bearings can be used in particular to fix and/or mount axles and shafts, depending on the design, absorbing radial and/or axial forces and at the same time enabling the rotation of the shaft or the components mounted on an axle in this way.

For this purpose, rolling elements are arranged between an inner ring and an outer ring of the roller bearing. Between these three main components, inner ring, outer ring and the rolling elements, it is usually mainly rolling friction that occurs within the rolling bearing. Since the rolling elements in the inner and outer ring can preferably roll on hardened steel surfaces with optimized lubrication, the rolling friction of such bearings is relatively low. A roller bearing can have one or more rows.

The roller bearing can be used in particular in a vehicle that is cleaned with high-pressure cleaners. Examples would be in particular off-road vehicles, mountain bikes, off-road motorcycles, tractors, etc.

The inner ring can in particular connect the shaft accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the shaft can be connected to the side of the lateral surface of the inner ring facing the shaft, with the rolling elements of the roller bearing rolling on the inner ring raceway opposite this lateral surface. The inner ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the inner ring in one piece or in multiple pieces, in particular in two pieces.

The outer ring can, in particular, connect the bearing arrangement accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the bearing can be connected to the side of the lateral surface of the outer ring facing the bearing, the rolling elements of the roller bearing rolling on the outer ring raceway opposite this lateral surface. The outer ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the outer ring in one piece or in multiple pieces, in particular in two pieces.

Depending on the type of rolling bearing, the rolling elements have the shape of a ball or a roller. They roll on the running tracks of the Wälz bearing and have the task of transferring the force acting on a radial roller bearing from the outer ring to the inner ring and vice versa. In an axial roller bearing, the rolling elements transmit the forces acting on the axial roller bearing between the running disks. Roller-shaped rolling elements are also referred to as roller rolling elements and spherical rolling elements as bearing balls.

Roller-shaped rolling bodies can be selected, for example, from the group of symmetrical spherical rollers, asymmetrical spherical rollers, cylindrical rollers, needle rollers and/or tapered rollers.

Rolling elements can be guided and spaced apart in a cage or by rolling element spacers. In principle, it is also conceivable to design a roller bearing without a cage, which is also referred to as a full complement roller bearing. In full complement rolling bearings, adjacent rolling elements can contact each other.

The rolling bodies can roll within the rolling bearing, in particular on the inner ring raceway of the inner ring. For this purpose, the surface of the inner ring raceway can advantageously be designed to be correspondingly abrasion-resistant, for example also by means of a corresponding surface treatment process and/or by applying a corresponding additional layer of material.

The inner ring raceway can be flat or profiled. A profiled design of the inner ring raceway can be used, for example, to guide the rolling elements on the inner ring raceway. On the other hand, a planar formation of the inner ring raceway can, for example, allow a certain axial displaceability of the rolling elements on the inner ring raceway.

The rolling bodies can roll within the rolling bearing, in particular on the outer ring raceway of the outer ring. For this purpose, the surface of the outer ring raceway can advantageously be designed to be abrasion-resistant, for example by means of a corresponding surface treatment process and/or by applying a corresponding additional layer of material.

The outer ring raceway can be flat or profiled. A profiled design of the outer ring raceway can be used, for example, to guide the rolling elements on the outer ring raceway. On the other hand, a planar shape of the outer ring raceway can, for example, allow a certain axial displaceability of the rolling elements on the outer ring raceway.

A roller bearing may have a seal to prevent lubricant from escaping from the roller bearing or dirt or moisture from entering the roller bearing. For this purpose, the seals used can be provided with one or more sealing lips, which can rest against a component of the roller bearing. These are designed in such a way that on the one hand they seal the bearing for as long as possible over the entire service life, and on the other hand the friction caused by the adjacent seal is not too high.

According to a preferred embodiment of the invention, it can be advantageous for the first sealing lip to define a circumferential, annular gap-like channel during operation of the roller bearing with the side of the wedge-shaped inner ring rim and/or outer ring rim facing away from the interior of the roller bearing, so that the first sealing lip is in contact with one another during operation the inner ring rim and/or the outer ring rim, the first sealing lip also having an axial spring elasticity, so that when there is a defined force acting axially inside the roller bearing on the first sealing lip, the channel is closed by the first sealing lip.

Furthermore, it can be advantageous that the inner ring rim is offset inwards in the radial direction relative to the inner ring and/or the outer ring rim is/are offset in the radial direction relative to the outer ring.

In a further development of the invention, it can also be preferred that the first sealing lip and the second sealing lip are operatively connected to one another in such a way that when an axial force is applied to the first sealing lip, a rectified axial force is transmitted to the second sealing lip and its axial sealing effect is thus improved .

The invention is explained in more detail below with reference to figures without restricting the general inventive idea. The figures are only of a schematic nature and serve exclusively for understanding the invention. The same elements are provided with the same reference numbers. The different features of the various exemplary embodiments can also be freely combined with one another within what is technically feasible.

• 1 ein Wälzlager in einer schematischen Querschnittsansicht,
• 2 eine Detaildarstellung des Dichtungsbereichs mit einer ersten Betriebsstellung der Dichtung in einer Querschnittsansicht,
• 3 eine Detaildarstellung des Dichtungsbereichs mit einer zweiten Betriebsstellung der Dichtung in einer Querschnittsansicht, und
• 4 eine Detaildarstellung des Dichtungsbereichs mit einer dritten Betriebsstellung der Dichtung in einer Querschnittsansicht.

Show it:

• 1 a rolling bearing in a schematic cross-sectional view,
• 2 a detailed representation of the sealing area with a first operating position of the seal in a cross-sectional view,
• 3 a detailed representation of the sealing area with a second operating position of the seal in a cross-sectional view, and
• 4 a detailed view of the sealing area with a third operating position of the seal in a cross-sectional view.

the 1 showed an embodiment of a roller bearing arrangement 1 according to the invention, comprising a roller bearing 2 with an inner ring 3, an outer ring 4 and rolling elements 5, the inner ring 3 having an inner ring raceway 6 and the outer ring 4 having an outer ring raceway 7 and the rolling elements 5 between the inner ring 3 and the outer ring 4 are arranged in a rolling manner. The roller bearing 2 also has a seal 8 on each end face, which are each arranged to extend in the radial direction between the inner ring 3 and the outer ring 4 .

The seal area indicated by the dash-dot line in the 1 is indicated, and the seal 8 is based on the detailed representation of the sealing area in the 2 explained further. Even if the sealing area is described below with reference to the inner ring 3 , it goes without saying that these statements apply to the outer ring 4 in an analogous manner.

The inner ring 3 has a wedge-shaped inner ring rim 9 which is directed radially inwards into the interior of the roller bearing 2 . The inner ring rim 9 has an essentially triangular cross-sectional contour which runs in a closed ring shape over the circumference of the inner ring 3 . The inner ring rim 9 is offset inward in the radial direction relative to the inner ring 3 . This is in the 2 indicated by the radial offset 15.

The seal 8 comprises a first sealing lip 11 which, in the operating position shown, rests without contact on the side of the wedge-shaped inner ring rim 9 facing away from the interior of the roller bearing 2 . As a result, the roller bearing 2 is designed to be particularly low-friction during operation, ie when the inner ring 3 rotates. The wedge-shaped sealing lip 11 runs in sections parallel to the outward-facing side of the wedge-shaped inner ring rim 9 , so that a narrow annular gap-like channel 14 is formed between the inner ring rim 9 and the sealing lip 11 .

The seal 8 also has a second sealing lip 12 which is supported on a radially extending section 13 of the inner ring 3 which is opposite the side of the wedge-shaped inner ring rim 9 facing the interior of the roller bearing 2 in the axial direction. In the exemplary embodiment shown, the second sealing lip 12 has two contact or sealing contacts, which are radially offset from one another, with the section 13 of the inner ring 3.

In the operating position of the seal 8 shown, the first sealing lip 11 forms a circumferential, annular-gap-like channel 14 with the side of the wedge-shaped inner ring rim 9 facing away from the interior of the roller bearing 2, so that the first sealing lip 11 has no contact with the inner ring rim 9 during operation. The first sealing lip However, 11 has an axial spring elasticity, so that in the presence of a defined force acting axially into the interior of the roller bearing 2 on the first sealing lip 11, the channel 14 is closed by the first sealing lip 11. This operating position of the seal 8 is in 3 shown.

The axial force acting on the first sealing lip 11, indicated by the arrows, can originate, for example, from a water jet, for example from a high-pressure cleaner. It is easy to see that the first sealing lip 11 rests flat against the inner ring rim 9, as a result of which a particularly good sealing effect can be achieved.

The first sealing lip 11 and the second sealing lip 12 are operatively connected to one another in such a way that when the axial force is applied to the first sealing lip 11, a rectified axial force is transmitted to the second sealing lip 12 and its axial sealing effect is thus improved.

If, despite these measures, water and/or other contaminants should get in, the design of the sealing area and the centrifugal forces acting on it during operation of the roller bearing 2 can prevent water and/or other dirt from penetrating the roller bearing and water and / or another dirt load from the roller bearing 2 are effected. This is subsequently based on the 4 explained in more detail.

In the operating situation shown, there is no longer any axial force acting on the sealing lip 11 . Consequently, the channel 14 has opened again due to the spring-elastic axial pivoting back of the sealing lip 11 . A fluid 17 , for example water, has penetrated into the annular space 16 formed between the second sealing lip 12 and the inner ring rim 9 . During operation of the roller bearing 2, ie during rotation of the inner ring 3, a centrifugal force acts on the fluid 17, which hurls the fluid 17 radially outwards. This can then be passed through the open channel 14 to the outside, out of the roller bearing 2 .

The invention is not limited to the embodiments shown in the figures. The above description is therefore not to be taken as limiting rather than illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two features of the same type, without establishing a ranking.

Reference List

1

roller bearing arrangement

2

roller bearing

3

inner ring

4

outer ring

5

rolling elements

6

inner ring raceway

7

outer ring raceway

8th

poetry

9

inner ring rim

10

outer ring rim

11

sealing lip

12

second sealing lip

13

section

14

channel

15

offset

16

annulus

17

fluid/dirt cargo

Claims (4)

Rolling bearing arrangement (1), a rolling bearing (2) with an inner ring (3), an outer ring (4) and rolling bodies (5), the inner ring (3) having an inner ring raceway (6) and the outer ring (4) having an outer ring raceway (7) wherein the rolling elements (5) are arranged in a rolling manner between the inner ring (3) and the outer ring (4), the roller bearing (2) also having a seal (8) which is between the inner ring (3) and the outer ring (4) extending in the radial direction, characterized in that the inner ring (3) has a wedge-shaped inner ring rim (9) directed radially into the interior of the roller bearing (2) and/or the outer ring (4) has a wedge-shaped rim radially into the interior of the roller bearing (2) directed outer ring rim (10), and the seal (8) comprises a first sealing lip (11) which faces away from the interior of the roller bearing (2) side of the wedge-shaped inner ring rim (9) and / or second sealing lip (12) outer ring rim ( 10) and the seal (8) at least ei has a second sealing lip (12) which is supported on a radially extending section (13) of the inner ring (3) and/or the outer ring (4) which is on the side of the wedge-shaped inner ring rim (9) facing the interior of the roller bearing (2). and / or outer ring rim (10) opposite in the axial direction. Rolling bearing arrangement (1), after claim 1 , characterized in that the first sealing lip (11) in operation of the roller bearing (2) with the interior of the roller bearing (2) facing away from the wedge-shaped inner ring rim (9) and / or outer ring rim (10) has a circumferential, annular gap-like channel (14) defined, so that the first sealing lip (11) is designed without contact with the inner ring rim (9) and/or the outer ring rim (10) during operation, wherein the first sealing lip (11) also has an axial spring elasticity, so that when there is an axially Inside the roller bearing (2) on the first sealing lip (11) acting defined force of the channel (14) is closed by the first sealing lip (11). Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the inner ring rim (9) is offset inward in the radial direction relative to the inner ring (3) and/or the outer ring rim (10) is offset in the radial direction relative to the outer ring (4). Outside is formed offset / are. Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the first sealing lip (11) and the second sealing lip (12) are operatively connected to one another in such a way that when an axial force is applied to the first sealing lip (11), a rectified axial force transferred to the second sealing lip (12) and so their axial sealing effect is improved.

Images