DE102022115634A1 - Double row spherical roller bearing - Google Patents

Abstract

The invention relates to a double-row spherical roller bearing (2) with an outer ring (4) having a uniformly spherical outer ring raceway (3) and with an inner ring (6) comprising two separate inner ring raceways (5a, 5b) which is coaxially surrounded by the outer ring (4). with roller-shaped rolling elements (8a, 8b) arranged in two rows of rollers (7a, 7b), those rolling elements (8a, 8b) that are combined in a row of rollers (7a, 7b) being in one of the two separate inner ring raceways (5a, 5b ) of the inner ring (6) and in the uniformly spherical outer ring raceway (3) of the outer ring (4), the rolling elements (8a, 8b) rolling in a two-part cage (9) with a first cage half assigned to the first row of rollers (7a). (9a) and a second cage half (9b) assigned to the second row of rollers (7b), the first cage half (9a) and the second cage half (9b) in the assembled state of the cage (9) being located axially between the rows of rollers (7a .7b) arranged, extending in the radial direction towards the outer ring (4) and with play relative to this guide section (10), the rolling elements (8a, 8b) abutting on the guide section (10).

Description

The present invention relates to a double-row spherical roller bearing with an outer ring having a uniformly spherical outer ring raceway and with an inner ring comprising two separate inner ring raceways, which is coaxially surrounded by the outer ring, with roller-shaped rolling elements arranged in two rows of rollers, those rolling elements which are combined in a row of rollers , roll in one of the two separate inner ring raceways of the inner ring and in the uniformly spherical outer ring raceway of the outer ring, the rolling elements being guided in a two-part cage with a first cage half assigned to the first row of rollers and a second cage half assigned to the second row of rollers.

Double-row spherical roller bearings have long been part of the state of the art and, like all rolling bearings, have an inner bearing ring, an outer bearing ring arranged coaxially to the inner bearing ring and maintaining a radial distance from it, and rolling elements that roll on raceways provided by the bearing rings. The raceway in the outer bearing ring is uniformly spherical, while two separate raceways are provided in the inner bearing ring, each of which is delimited axially on the outside by a shelf. The barrel-shaped rolling elements are arranged in two rows of rollers, with the rolling elements of one row of rollers in one raceway on the inner bearing ring and the rolling bodies of the other row of rollers in the other raceway on the inner bearing ring and the rolling bodies of both rows of rollers in the common, spherical raceway of the outer bearing ring roll off. Such an arrangement is approximately DD 213 980 removable.

So that the rolling elements of the two rows of rollers are guided during operation of the spherical roller bearing and kept at an equidistant distance in the circumferential direction, a receptacle that accommodates the rolling elements is provided. This receptacle, which is usually referred to as a cage, can be formed by two separate cages, each of which accommodates the rolling elements of one row of rollers, or one cage which accommodates the rolling elements of both rows of rollers. The cage can be designed as a so-called comb cage, in which webs extend from a circumferential ring in the axial direction, which accommodate the rolling elements between them. If the webs of a cage point axially to the left and axially to the right in relation to the ring, this is called a double comb cage.

In addition to the double comb cages, pocket cages are also known in the area of spherical roller bearings, which can also be made in one piece or in several parts.

In such spherical roller bearings, the cage is usually guided by an annular guide segment to hold the cage in its position. Such a guide element is usually guided through the outer ring raceway of the outer ring. The guide segment therefore runs between the cage and the outer ring raceway. Since the guide segment is running, the rotational speed of the guide segment and the rotational speed of the cage are usually not identical, which leads to uneven support of the cage and also disrupts the smooth rolling of the rollers around their axis in the bearing. This usually affects the performance of the bearing.

It is therefore the object of the invention to provide a spherical roller bearing with an improved cage that has high wear resistance and operational reliability.

This task is solved by a double-row spherical roller bearing with an outer ring having a uniformly spherical outer ring raceway and with an inner ring comprising two separate inner ring raceways, which is coaxially surrounded by the outer ring, with roller-shaped rolling elements arranged in two rows of rollers, those rolling elements being combined in a row of rollers are, roll in one of the two separate inner ring raceways of the inner ring and in the uniformly spherical outer ring raceway of the outer ring, the rolling elements being guided in a two-part cage with a first cage half assigned to the first row of rollers and a second cage half assigned to the second row of rollers, whereby the first cage half and the second cage half in the assembled state of the cage have a guide section which is arranged axially between the rows of rollers, extends in the radial direction towards the outer ring and has play relative to it, the rolling bodies abutting on the guide section.

This has the advantage that the guidance of the rolling elements through the cage is improved. Furthermore, the guide integrated in the cage relative to the outer ring raceway means that the use of a separate guide element for the cage can be dispensed with, which brings with it both cost and assembly advantages.

First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are mentioned in the claim sentence and particularly preferred editions are given below designs of the subject matter of the invention are described.

Spherical roller bearings can be used in particular to enable rotational movements with the lowest possible friction losses. Spherical roller bearings can be used in particular for fixing and/or supporting axles and shafts, whereby, depending on the design, they absorb radial and/or axial forces and at the same time enable the rotation of the shaft or the components mounted on an axle.

For this purpose, rolling rolling bodies are arranged between an inner ring and an outer ring of the rolling bearing. As a rule, mainly rolling friction occurs within the rolling bearing between these three main components, the inner ring, the outer ring and the rolling elements. Since the rolling elements in the inner and outer rings can preferably roll on hardened steel surfaces with optimized lubrication, the rolling friction of such bearings is relatively low.

The inner ring can in particular connect the shaft receiving spherical roller bearings to the rolling bearing or the rolling elements. 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 spherical roller bearing rolling on the inner ring raceway opposite this lateral surface. The inner ring can be formed from a metallic and/or ceramic material. In principle, it is conceivable to design the inner ring in one piece or in several parts, in particular in two parts.

The inner ring can have an inner ring recess. In particular, a cover disk, sealing disk and/or seal can be arranged in an inner ring recess, in particular in a non-positive and/or positive manner. The inner ring recess is preferably designed as a circumferential groove in the inner ring.

The outer ring can in particular connect the bearing accommodating the spherical roller bearing with the rolling bearing or the rolling elements. In particular, the bearing can be connected to the side of the lateral surface of the outer ring facing the bearing, with the outer ring raceway opposite this lateral surface rolling the rolling elements of the spherical roller bearing. The outer ring can be formed from a metallic and/or ceramic material. In principle, it is conceivable to design the outer ring in one piece or in several parts, in particular in two parts.

The outer ring can have an outer ring recess. In particular, a cover disk, sealing disk and/or seal can be arranged in an outer ring recess, in particular in a non-positive and/or positive manner. The outer ring recess is preferably designed as a circumferential groove in the outer ring.

The rolling elements have the shape of a roller. They roll on the raceways of the spherical roller bearing. Roller-shaped rolling elements are also referred to as roller rolling elements. Roller-shaped rolling elements can, for example, be selected from the group of symmetrical barrel rollers or asymmetrical barrel rollers.

The rolling elements can roll within the spherical roller 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 by means of a corresponding surface treatment process and/or by applying a corresponding additional material layer. 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. A flat shape of the inner ring raceway, on the other hand, can, for example, allow a certain axial displaceability of the rolling elements on the inner ring raceway.

The rolling elements can roll within the spherical roller 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 correspondingly abrasion-resistant, for example by means of a corresponding surface treatment process and/or by applying a corresponding additional material layer.

A spherical roller bearing can have a cage, with the cage guiding the rolling elements. The cage is designed in such a way that the rolling body rollers are spaced apart from one another, so that, for example, the friction and heat development of the rolling bodies is kept as low as possible. Furthermore, the cage keeps the rolling element rollers at a fixed distance from one another when rolling, which means that an even load distribution can be achieved. The cage can be made in one piece or in several pieces.

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

According to an advantageous embodiment of the invention, it can be provided that the first cage half has a first guide section on which the first row of rollers of rolling bodies starts and the second cage half has a second guide section on which the second row of rollers of rolling bodies starts.

According to a further preferred further development of the invention, it can also be provided that the first cage half and the second cage half are designed to be essentially the same, which can contribute to a reduction in component variance and an improvement in manufacturing costs.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the cage is formed from a metal, in particular from steel. In principle, it would also be conceivable to form the cage partially or completely from a plastic.

According to a further particularly preferred embodiment of the invention, it can be provided that the cage is configured as a two-part pocket cage. Alternatively, the cage can also be designed as a comb cage.

Furthermore, the invention can also be further developed in such a way that the first cage half has a first outer ring and a first inner ring, between which a plurality of first axial webs extend circumferentially distributed, so that the first outer ring, the first inner ring and the first axial webs define first cage pockets for receiving the first row of rollers, and / or the second cage half has a second outer ring and a second inner ring, between which a plurality of second axial webs extend circumferentially distributed, so that the second outer ring, the second inner Ring and the second axial webs define second cage pockets for receiving the second row of rollers.

In a likewise preferred embodiment variant of the invention it can also be provided that the outer diameter of the first outer ring is smaller than the outer diameter of the first inner ring and/or the outer diameter of the second outer ring is smaller than the outer diameter of the second inner ring .

It can also be advantageous to further develop the invention in such a way that the first inner ring and the second inner ring rest on a common ring surface.

The invention will be explained in more detail below using figures without restricting the general idea of the invention.

• 1 ein Pendelrollenlager in einer Axialschnittdarstellung,
• 2 ein Pendelrollenlager in einer perspektivischen Axialschnittdarstellung mit einem teiltransparenten Außenring,
• 3 ein Taschenkäfig mit zwei gleichteiligen, nicht zusammengesetzten Käfighälften in einer perspektivischen Ansicht.

It shows:

• 1 a spherical roller bearing in an axial sectional view,
• 2 a spherical roller bearing in a perspective axial section view with a partially transparent outer ring,
• 3 a bag cage with two equal, unassembled cage halves in a perspective view.

The 1-2 show a double-row spherical roller bearing 2 with an outer ring 4 having a uniformly spherical outer ring raceway 3 and with an inner ring 6 comprising two separate inner ring raceways 5a, 5b, which is coaxially surrounded by the outer ring 4.

The spherical roller bearing 2 also has roller-shaped rolling elements 8a, 8b arranged in two rows of rollers 7a, 7b, with those rolling elements 8a, 8b that are combined in a row of rollers 7a, 7b in one of the two separate inner ring raceways 5a, 5b of the inner ring 6 and in the uniformly spherical outer ring raceway 3 of the outer ring 4.

The rolling elements 8a, 8b are guided in a two-part cage 9 with a first cage half 9a assigned to the first row of rollers 7a and a second cage half 9b assigned to the second row of rollers 7b.

In the assembled state of the cage 9, the first cage half 9a and the second cage half 9b have a guide section 10 which is arranged axially between the rows of rollers 7a, 7b, extends in the radial direction towards the outer ring 4 and has play relative to it, the rolling elements 8a, 8b start the guide section 10.

From the 1-2 It can also be seen that the first cage half 9a has a first guide section 10a, on which the first row of rollers 7a runs on rolling elements 8a, and the second cage half 9b has a second guide section 10b, on which the second row of rollers 7b runs on rolling elements 8b.

From the 3 It can be clearly seen that the first cage half 9a and the second cage half 9b are essentially of equal parts.

In the exemplary embodiment shown, the cage 9 is configured as a two-part pocket cage 11. Here, the first cage half 9a has a first outer ring 12a and a first inner ring 13a, between which a plurality of first axial webs 14a extend circumferentially, so that the first outer ring 12a, the first inner ring 13a and the first axial webs 14a are first Define cage pockets 15a to accommodate the first row of rollers 7a. Analogously to this, the second cage half 9b also has a second outer ring 12b and a second inner ring 13b, between which a plurality of second axial webs 14b extend circumferentially, so that the second outer ring 12b, the second inner ring 13b and the second axial webs 14b define second cage pockets 15b for receiving the second row of rollers 7b.

The outer diameter of the first outer ring 12a is smaller than the outer diameter of the first inner ring 13a, just as the outer diameter of the second outer ring 12b is smaller than the outer diameter of the second inner ring 13b. The first inner ring 13a and the second inner ring 13b rest on a common annular surface 16.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be viewed as limiting but rather as illustrative. The following patent claims are to be understood as meaning that a stated 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' features, this designation serves to distinguish two similar features without establishing a ranking.

Reference symbol list

2

Spherical roller bearings

3

Outer ring raceway

4

Outer ring

5a

Inner ring raceway

5b

Inner ring raceway

6

Inner ring

7a

Role row

7b

Role row

8a

rolling elements

8b

rolling elements

9

Cage

9a

half of the cage

9b

half of the cage

10

Leadership section

10a

Leadership section

10b

Leadership section

11

Pocket cage

12a

ring

12b

ring

13a

ring

13b

ring

14a

Axial webs

14b

Axial webs

15a

Cage bags

15b

Cage bags

16

ring surface

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DD 213980 [0002]

Claims (8)

Double-row spherical roller bearing (2) o with an outer ring (4) having a uniform spherical outer ring raceway (3) and ○ with an inner ring (6) comprising two separate inner ring raceways (5a, 5b) which is coaxially surrounded by the outer ring (4), o with Roll-shaped rolling elements (8a, 8b) arranged in two rows of rollers (7a, 7b), those rolling elements (8a, 8b) that are combined in a row of rollers (7a, 7b) being in one of the two separate inner ring raceways (5a, 5b) of the inner ring (6) and in the uniformly spherical outer ring raceway (3) of the outer ring (4), ○ the rolling elements (8a, 8b) in a two-part cage (9) with a first cage half assigned to the first row of rollers (7a). (9a) and a second cage half (9b) assigned to the second row of rollers (7b), characterized in that the first cage half (9a) and the second cage half (9b) in the assembled state of the cage (9) have an axial position between the Rows of rollers (7a, 7b) arranged, extending in the radial direction towards the outer ring (4) and with play in relation to this guide section (10), the rolling elements (8a, 8b) abutting on the guide section (10). Spherical roller bearing (2). Claim 1 , characterized in that the first cage half (9a) has a first guide section (10a) on which the first row of rollers (7a) runs on rolling elements (8a) and the second cage half (9b) has a second guide section (10b) on which the second row of rollers (7b) starts on rolling elements (8b). Spherical roller bearing (2) according to one of the preceding claims, characterized in that the first cage half (9a) and the second cage half (9b) are designed to have essentially the same parts. Spherical roller bearing (2) according to one of the preceding claims, characterized in that the cage (9) is formed from a metal, in particular from steel. Spherical roller bearing (2) according to one of the preceding claims, characterized in that the cage (9) is configured as a two-part pocket cage (11). Spherical roller bearing (2) according to one of the preceding claims, characterized in that the first cage half (9a) has a first outer ring (12a) and a first inner ring (13a), between which a plurality of first axial webs (14a) are distributed circumferentially. extends, so that the first outer ring (12a), the first inner ring (13a) and the first axial webs (14a) define first cage pockets (15a) for receiving the first row of rollers (7a), and / or the second cage half (9b) a second outer ring (12b) and a second inner ring (13b), between which a plurality of second axial webs (14b) extend circumferentially, so that the second outer ring (12b), the second inner ring (13b) and the second axial webs (14b) define second cage pockets (15b) for receiving the second row of rollers (7b). Spherical roller bearing (2). Claim 6 , characterized in that the outer diameter of the first outer ring (12a) is smaller than the outer diameter of the first inner ring (13a) and / or the outer diameter of the second outer ring (12b) is smaller than the outer diameter of the second inner one Rings (13b). Spherical roller bearing (2) according to one of the previous ones Claims 6 - 7 , characterized in that the first inner ring (13a) and the second inner ring (13b) rest on a common annular surface (16).

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