DE102019213801A1 - Rolling bearing arrangement and rolling bearing - Google Patents

Abstract

Disclosed are a rolling bearing arrangement with at least two radial lubricant spaces between which at least one circumferential retaining body is arranged, each of which is fixed in position via a radial section between bearing rings, and a rolling bearing with a circumferential retaining body as an axial limit for a lubricant compartment. The retaining bodies are, for example, I-shaped or flat or L-shaped profiles.

Description

The invention relates to a roller bearing arrangement according to the preamble of claim 1 and a roller bearing according to the preamble of claim 7.

Radial and axial roller bearings are used for the rotatable mounting of two objects to one another. Rolling bearings have at least two bearing rings, which can each be arranged on one of the objects to be supported and rotatable relative to one another about a common axis. In order to enable the bearing rings to slide against one another with as little friction as possible, rolling bodies are arranged between the bearing rings and roll or roll on the running surfaces of the bearing rings. In the case of radial roller bearings, a bearing ring, which is arranged with its inner surface on an object to be supported, is referred to as the inner ring and a bearing ring, which is arranged with its outer surface on an object to be supported, is referred to as the outer ring. The inner ring accordingly has a smaller diameter than the outer ring.

To reduce the rolling resistance of rolling bearings, linear guides or ball screws, to ensure the smoothest and most uniform possible run, to reduce operating temperatures and to achieve low wear, the rolling elements and the running surfaces have the smoothest and most uniform surface possible and are made of a hard, low-wear material , preferably made of corrosion-resistant material. Furthermore, roller bearings, linear guides and ball screws have lubrication, e.g. grease or oil lubrication, in order to further reduce the rolling resistance.

Furthermore, it is known to combine rolling bearings into multi-row rolling bearing arrangements and transporting them in the fully assembled state, in particular transporting them horizontally, since transporting them horizontally, especially in the case of particularly large rolling bearings, is particularly safe and the rolling bearings are easier to handle lying down. In the case of multi-row rolling bearings, when transporting in a horizontal position, there is often the problem that bearing grease gets from one rolling bearing row to another rolling bearing row due to the influence of gravity and / or temperature and / or vibrations. "Lying" means with the bearing axis of rotation oriented vertically. Such a shift of grease can lead to complications, such as increased friction, temperature peaks, increased internal bearing pressure and / or grease leakage, particularly in the running-in phase of the rolling bearing.

In addition, from the DE 10 2015 204 432 A1 a rolling bearing arrangement is known, the lubricant spaces of which are essentially separated from adjacent rows of bearings by a circumferential I-shaped retaining body or a circumferential U-shaped retaining body.

The object of the invention is to create an improved roller bearing arrangement and an improved roller bearing.

This object is achieved by a roller bearing arrangement with the features of claim 1 and by a roller bearing with the features of claim 9.

A roller bearing arrangement has at least two roller bearings, the bearing rows of which are each arranged in a lubricant chamber, which are bounded radially by two bearing rings each, as well as by a sealing element at their opposite axial ends and by at least one retaining body for retaining lubricant at their facing axial ends are. According to the invention, the restraint bodies are each a circumferential profile. They are fixed in position via a radial section between each of the bearing rings.

The at least one retaining body offers the advantage that a lubricant, in particular bearing grease, remains in the lubricant spaces and cannot pass from one lubricant space into the other lubricant space. This advantage or effect occurs even with so-called I-shaped or web-like or flat profiles. This is particularly advantageous for the transport of horizontal roller bearing arrangements, since a horizontal transport, in particular through an interaction of gravity, temperature and vibrations, generally promotes an exchange of grease between the rows of bearings. An exchange of grease between the rows of bearings is prevented or at least severely restricted by means of the at least one retaining body. The risk of one row of bearings running dry is significantly reduced. Relubrication of the roller bearing arrangement is therefore not necessary. The external sealing elements significantly reduce the penetration of foreign bodies, such as dust or dirt particles, into the lubricant spaces. An exemplary rolling bearing arrangement is a radial double row cylindrical roller bearing.

In a preferred embodiment, two retaining bodies are provided, the retaining bodies each having a circumferential L-shaped profile with an axial section which extends into the lubricant spaces near the other bearing rings. “Close” means at a smaller radial distance than to the other bearing rings.

The bearing rings on which the retaining bodies are held are preferably The outer rings of the rolling bearings and the other bearing rings are the inner rings of the rolling bearings. These measures simplify the assembly of the rolling element arrangement. The fact that both the restraint bodies are arranged with their free ends near the distant bearing rings that do not hold them and thereby extend into the lubricant spaces prevents friction between the restraint bodies and the nearby bearing rings and further complicates a lubricant transfer or lubricant leakage.

It is advantageous in terms of device technology if the radial sections are each inserted in an annular groove of the outer rings, which are open to the respective lubricant space and axially outwards. When mounting the roller bearings, the retaining bodies are thus clamped or clamped between the outer rings.

The restraint bodies are stabilized when they are positioned with respect to one another in such a way that they are in contact with one another at the rear. As a result, the restraint bodies support or stabilize one another. The retaining bodies are preferably designed as one element, which simplifies assembly due to the correspondingly reduced number of parts. In addition, the one-piece design ensures that the unlikely event that lubricant collects between the retaining bodies in the contact area is excluded.

The retaining bodies are designed in such a way that they retain a bearing lubricant, in particular bearing grease. Accordingly, the retaining bodies have a lubricant-resistant material such as a suitable metal alloy or a suitable plastic. Advantageously, the restraint bodies and in particular their radial sections have an open material structure such as a woven fabric, a knitted fabric and the like, which can absorb adjacent lubricant.

From a manufacturing point of view, it is advantageous if the radial sections and the axial sections have a constant thickness. For example, the restraint bodies have the following dimensions: outside diameter 140 mm to 320 mm, inside diameter 105 mm to 280 mm and thickness 2 mm to 4 mm.

In an alternative embodiment, the bearing rings are each axially composed of one another via an inner intermediate ring and an outer intermediate ring, and the retaining bodies are each clamped between a bearing ring and an intermediate ring. The axial length of the roller bearing arrangement can be adjusted by means of the intermediate rings without having to change the axial dimensions of the bearing rings.

A roller bearing according to the invention, in particular for a roller bearing arrangement composed of at least two such roller bearings, has a row of bearings which is arranged in a lubricant space. The lubricant space is bounded radially by two bearing rings, and at one axial end by a sealing element and at its other axial end by a retaining body for retaining lubricant. According to the invention, the restraint body is a circumferential profile. It is fixed in position on one bearing ring via its radial section.

By axially positioning a second roller bearing, such a roller bearing enables the creation of a roller bearing arrangement in which an exchange of lubricant between adjacent lubricant spaces is prevented. In addition, the sealing element and the retaining body prevent lubricant from leaking out of the lubricant chamber and contaminants from penetrating into the same during horizontal transport or when an individual roller bearing is stored horizontally.

The retaining body is preferably a circumferential L-shaped profile and is located with an axial section close to the other bearing ring, wherein it extends into the lubricant space.

Other advantageous exemplary embodiments of the invention are the subject of further subclaims.

• 1 einen Längsschnitt durch ein erstes Ausführungsbeispiel einer erfindungsgemäßen Wälzlageranordnung,
• 2 einen Schnitt durch die Wälzlageranordnung entlang der Linie AA zwischen zwei benachbarten Zurückhaltekörpern hindurch, und
• 3 einen Längsschnitt durch ein zweites Ausführungsbeispiel einer erfindungsgemäßen Wälzlageranordnung.

In the following, preferred exemplary embodiments of the invention are explained with the aid of the greatly simplified figures attached. Show it

• 1 a longitudinal section through a first embodiment of a roller bearing arrangement according to the invention,
• 2 a section through the roller bearing arrangement along the line AA between two adjacent retaining bodies, and
• 3 a longitudinal section through a second embodiment of a roller bearing arrangement according to the invention.

In 1 is a preferred first embodiment of a roller bearing arrangement according to the invention 1 , which is designed here as a double-row cylindrical roller bearing. The roller bearing arrangement 1 in the embodiment shown here, two radial roller bearings 2 , 4th each with a running row. The rolling bearings 2 , 4th each have a radially outer outer ring 6a , 6b and a radially inner inner ring 8a , 8b , between which the running rows with their rolling elements 12th are arranged. The rolling bearings 2 , 4th , are axially aligned with a bearing center axis or axis of rotation x aligned and connected on the front side with one. In the following, all information such as “radially inside” and “radially outside” refer to the axis of rotation x. The outer rings resting against one another are preferred 6a , 6b and the inner rings resting against one another 8a , 8b axially clamped together, for example by means of screws, not shown.

The rolling elements 1 here are cylindrical rollers. They roll along a running surface on the outer ring side 14th and along a running surface on the inner ring side 16 between the outer rings 6a , 6b and the inner rings 8a , 8b from. To contact neighboring rolling elements 12th To prevent a running row, the rolling elements 12th in one bearing cage each 18th positioned.

The outer rings 6a , 6b and the opposite inner rings 8a , 8b each delimit a lubricant space 20a , 20b . The lubricant rooms 20a , 20b are filled with a lubricant and take the rolling elements 12th with their respective bearing cage 18th on.

The lubricant spaces are located on their axial sides facing away from one another 20a , 20b each with a sealing element 22nd axially limited on the outside. The lubricant spaces are on their facing axial sides 20a , 20b each with a retaining body 24a , 24b axially limited on the inside.

The sealing elements 22nd have a circumferential, multiple angled closed profile. The sealing elements 22nd prevent the lubricant from escaping from the lubricant spaces 20a , 20b and ingress of contaminants into them. They each have a hook-like holding section 26th to a radially outer downgrade 28 the outer rings 6a , 6b in alignment with an outer surface 30th the same used. With an axial section or with its radially inner free end section 32 run the sealing elements 22nd axially in each of the lubricant spaces 20a , 20b into it so that there is an axial overlap between the axial sections 32 and an opposite inner surface 34 the inner rings 8a , 8b gives. Between the axial sections 32 and the inner surfaces 34 is an annular gap in each case 36 formed so that the axial sections 32 not in contact with the inner rings 8a , 8b are located. The axial sections 32 are therefore close to the inner rings 8a , 8b and far from the outer rings 6a , 6b arranged. The annular gap 36 has a preferred height of 01 mm to 1 mm.

The material of the sealing elements 22nd is resistant to the lubricant. For example, it is a metal or a metal alloy or a polymer or a plastic mixture.

The restraint body 24a , 24b have a circumferential L-profile. They prevent the lubricant from crossing over from the one lubricant space 20a into the other lubricant compartment 20b and vice versa. They are with a radial section 38 into a radially inner annular groove 40 the outer rings 6a , 6b used. The ring groove 40 is in the edge area of a contact surface 42 and an inner surface 44 the outer rings 6a , 6b educated. The ring groove 40 and the associated retention body 24a , 24b are matched to one another in such a way that their radial sections in the inserted state 38 in alignment with the contact surfaces 42 the outer rings 6a , 6b run away.

With an axial section or with its radially inner free end section 46 run the restraint body 24a , 24b axially in each of the lubricant spaces 20a , 20b into it so that there is an axial overlap between the axial sections 32 and an opposite inner surface 48 the inner rings 8a , 8b gives. Between the axial sections 46 and the inner surfaces 48 is an annular gap in each case 50 formed so that the axial sections 46 not in contact with the inner rings 8a , 8b are located. The axial sections 46 are therefore close to the inner rings 8a , 8b and far from the outer rings 6a , 6b arranged. The annular gap 50 has a preferred height of 01 mm to 1 mm.

In the assembled state of the roller bearing arrangement 1 are the radial sections of the restraint body 24a , 24b between the outer rings 6a , 6b the roller bearing 2 , 4th clamped, where they rest against each other on the back.

The restraint bodies preferably have 24a , 24b over their radial section 38 and its axial section 46 a constant thickness D. .

As in the sectional view 2 for example on the restraint body 24a shown, there are at least the radial sections 38 made of an open material structure such as a woven fabric, a knitted fabric, a net for receiving lubricant and the like. The material of the restraint body 24a , 24b is resistant to the lubricant. For example, it is a metal or a metal alloy or a polymer or a plastic mixture.

In 3 is a second embodiment of the roller bearing assembly according to the invention 1 with two L-shaped retaining bodies 24a , 24b shown. The ones in the 1 and 3 Corresponding reference symbols denote the same elements.

In contrast to the first embodiment according to 1 are in the second embodiment 3 outer bearing rings each 6a , 6b and inner bearing rings 8a , 8b about a outer intermediate ring 52 and an inner intermediate ring 54 axially spaced from each other. The second exemplary embodiment thus has a greater axial extent in comparison to the first exemplary embodiment with identical bearing rings.

The restraint body 24a , 24b are with their axial section 32 each between the outer bearing ring 6a , 6b and the outer intermediate ring 52 pinched or fixed. Thus, in a further difference to the first exemplary embodiment, the two retaining bodies are located 24a , 24b not in rear contact with each other, but between them there is a circumferential space 56 created. To prevent lubricant from entering the space 56 to prevent is the inner intermediate ring 52 radially up to the restraint bodies 24a , 24b and is attached to it.

Disclosed are a roller bearing arrangement with at least two radial lubricant spaces between which at least one circumferential retaining body is arranged, which are fixed in position via a radial section between bearing rings, and a roller bearing with a circumferential retaining body as an axial limit for a lubricant space. The retaining bodies are, for example, I-shaped or flat or L-shaped profiles.

List of reference symbols

1

Roller bearing arrangement

2

roller bearing

4th

roller bearing

6a, b

Outer ring / bearing ring

8a, b

Inner ring / bearing ring

12th

Rolling elements

14th

Tread

16

Tread

18th

Bearing cage

20a, b

Lubricant room

22nd

Sealing element

24a, b

Restraint body

26th

Holding section

28

Downgrade

30th

Exterior surface

32

Axial section / free end section

34

Inner surface

36

Annular gap

38

Radial section

40

Ring groove

42

Contact area

44

Inner surface

46

Axial section / free end section

48

Inner surface

50

Annular gap

52

outer intermediate ring

54

inner intermediate ring

56

Space

D.

thickness

X

Bearing center axis / axis of rotation

QUOTES INCLUDED IN THE DESCRIPTION

This list of the 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.

Patent literature cited

• DE 102015204432 A1 [0005]

Claims (10)

Rolling bearing arrangement (1) with at least two rolling bearings (2, 4), the bearing rows of which are each arranged in a lubricant chamber (20a, 20b), each of which is radially supported by two bearing rings (6a, 8a and 6b, 8b), and on their axially facing away from each other Ends are each limited by a sealing element (22) and at their facing axial ends by at least one retaining body (24a, 20b) for retaining lubricant, characterized in that the at least one retaining body (24a, 24b) is a circumferential profile, wherein it is fixed in position via a radial section (38) between the bearing rings (6a, 6b or 8a, 8b). Rolling bearing arrangement according to Claim 1 , wherein two retaining bodies (24a, 24b) are provided, each of which is a circumferential L-shaped profile, and with their axial sections (46) facing away from one another they extend into the lubricant spaces (8a, 8b or 6a, 6b) near the other bearing rings (8a, 8b or 6a, 6b) 20a, 20b) extend into it. Rolling bearing arrangement according to Claim 1 or 2 , the bearing rings (6a, 6b) on which the retaining bodies (20a, 20b) are held, outer rings of the rolling bearings (2, 4) and the other bearing rings (8a, 8b) being inner rings of the rolling bearings (2, 4). Rolling bearing arrangement according to Claim 1 , 2 or 3 , wherein the radial sections (38) are each inserted in an annular groove (40) of the outer rings (6a, 6b) which are open to the respective lubricant space (20a, 20b) and axially outward. Rolling bearing arrangement according to one of the preceding claims, wherein the retaining bodies (24a, 24b) are positioned with respect to one another in such a way that they are in contact with one another at the rear. Rolling bearing arrangement according to one of the preceding claims, wherein at least the radial sections (38) of the retaining bodies (24a, 24b) each have an open material structure in certain areas. Rolling bearing arrangement according to one of the preceding claims, wherein the radial sections (38) and the axial sections (46) have a constant thickness (D). Rolling bearing arrangement according to one of the preceding claims, the bearing rings (6a, 8a and 6b, 8b) being axially of one another via an outer intermediate ring (52) and an inner intermediate ring (54) and the retaining bodies (24a, 24b) each between a bearing ring (6a, 8a and 6b, 8b) and an intermediate ring (52 or 54) are clamped. Rolling bearing (2, 4), in particular for a rolling bearing arrangement (1) according to one of the preceding claims, the bearing row of which is arranged in a lubricant space (20a, 20b) which is radially supported by two bearing rings (6a, 8a and 6b, 8b), as well as is bounded at its one axial end by a sealing element (22) and at its other axial end by a retaining body (24a, 24b) for retaining lubricant, the retaining body (20a, 20b) being a circumferential profile and having a radial section (38 ) on which one bearing ring (6a, 6b or 8a, 8b) is fixed in position. Rolling bearings (2, 4) after Claim 9 , wherein the retaining body (24a, 24b) is a circumferential L-shaped profile and extends with an axial section (46) near the other bearing ring (8a, 8b or 6a, 6b) into the lubricant space (20a, 20b).

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