DE102019123024A1 - Roller bearing arrangement - Google Patents

Abstract

The invention relates to a rolling bearing arrangement (1) comprising a rolling bearing (2) with an inner ring (3), an outer ring (4), a plurality of rolling elements (5) and a cage (6), the inner ring (3) having an inner ring raceway ( 7) and the outer ring (4) has an outer ring raceway (8), the rolling elements (5) rolling between the inner ring (3) and the outer ring (4) being mounted and spaced apart from one another by the cage (6), and the rolling elements ( 5) are designed as spherical rollers (9), the roller bearing (2) being designed as a floating bearing, the outer ring (4) having at least one groove (11) running in the axial direction and designed as an elongated hole (10), the groove ( 11) forms the receptacle for a retaining bolt (13) arranged in a stationary manner in a bearing seat (12), so that the roller bearing (2) is guided in the axial direction.

Description

The invention relates to a rolling bearing arrangement, comprising a rolling bearing with an inner ring, an outer ring, a plurality of rolling elements and a cage, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the rolling elements being supported in a rolling manner between the inner ring and the outer ring and through the cage are arranged spaced from one another, the rolling elements are shaped as spherical rollers and the rolling bearing is designed as a floating bearing.

Rolling bearing arrangements and rolling bearings with spherical rollers for use as floating bearings are well known from the offerings of rolling bearing manufacturers. There is a continuing need here to optimize rolling bearings with regard to their displaceability in the axial direction.

A spherical roller bearing, for example, is off DE 196 11 723 A1 known. It has an outer ring with a hollow spherical outer ring raceway, the center of curvature being in the center of the bearing of the spherical roller bearing. The rolling elements, which are held in a cage for spacing the rolling elements, run on this outer ring raceway. Furthermore, an inner ring with two inclined inner ring raceways is provided.

In the light of the known prior art, it is the object of the invention to create a roller bearing arrangement with the requirements of a floating bearing, which ensures optimized security against rotation while ensuring the required axial displaceability.

This object is achieved by a rolling bearing arrangement with the features of claim 1. The rolling bearing arrangement according to the invention comprises a rolling bearing with an inner ring, an outer ring, a plurality of rolling elements and a cage, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the Rolling bodies between the inner ring and the outer ring are rolling bearings and are spaced apart from one another by the cage, and the rolling bodies are designed as spherical rollers, the rolling bearing being designed as a floating bearing, characterized in that the outer ring has at least one groove running in the axial direction and designed as a slot , wherein the groove forms the receptacle for a retaining bolt arranged in a stationary manner in a bearing seat, so that the roller bearing is guided displaceably in the axial direction.
This enables the groove in the outer ring, designed as an elongated hole and running in the axial direction, to work together with a stationary retaining bolt to secure the roller bearing arrangement against rotation in the circumferential direction and to enable the roller bearing arrangement to be displaced in the axial direction in a bearing seat. This creates a rolling bearing arrangement that is optimized in terms of its properties and functions as a floating bearing.

First, the individual elements of the claimed subject matter of the invention are explained and particularly preferred embodiments of the subject matter of the invention are described below.

Rolling bearings are used in particular to fix 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 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, the inner ring, outer ring and the rolling elements, mainly rolling friction occurs within the rolling bearing. Since the rolling elements in the inner and outer ring usually roll on hardened steel surfaces with optimized lubrication, the rolling friction of these bearings is relatively low.

The inner ring connects the roller bearing receiving shaft with the roller bearing or the roller bodies. The shaft is connected to the side of the outer surface of the inner ring facing the shaft. The rolling elements of the rolling bearing roll on the inner ring raceway opposite this outer surface. The inner ring can be formed from a metallic and / or ceramic material.

The outer ring connects the bearing receiving the rolling bearing with the rolling bearing or the rolling elements. In this case, the bearing is connected to the side of the lateral surface of the outer ring facing the bearing. The rolling elements of the rolling bearing roll on the outer ring raceway opposite this lateral surface. The outer ring can be formed from a metallic and / or ceramic material.

The rolling elements have the shape of a ball or a roller, depending on the type of rolling bearing. They roll on the raceways of the inner ring and the outer ring and have the task of transferring the force acting on the roller bearing from the outer ring to the inner ring and vice versa.

A roller bearing can have a cage, the cage guiding the rolling elements. The cage is designed in such a way that the rolling element balls and / or the rolling element rollers are spaced apart from one another so that, for example, the friction and heat generation of the rolling elements is kept as low as possible. Furthermore, the cage keeps the rolling element balls and / or rolling element rollers at a fixed distance from one another when they roll, whereby a uniform load distribution can be achieved. The cage can be made in one piece or in several pieces. The rolling elements roll within the rolling bearing on the inner ring raceway of the inner ring. For this purpose, the surface of the inner ring raceway must be designed to be wear-resistant.

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 planar formation of the inner ring raceway can, however, allow for example a certain axial displaceability of the rolling bodies on the inner ring raceway. The rolling elements roll within the rolling bearing on the outer ring raceway of the outer ring. For this purpose, the surface of the outer ring raceway must be designed to be wear-resistant.

Spherical rollers are used to build spherical roller bearings. Spherical roller bearings are single, often double row rolling bearings, consisting of solid outer rings with a spherical outer ring raceway, solid inner rings and barrel rollers or spherical rollers with cages. The symmetrical barrel rollers or spherical rollers adjust freely on the hollow spherical outer ring raceway. This compensates for shaft deflections and misalignments in the bearing seating.

Spherical roller bearings have the property that the outer ring of the spherical roller bearing is heavily loaded by a radial component of axial forces acting on the spherical roller bearing, which can lead to an uncontrolled breakage of the outer ring. This applies above all to cases in which such spherical roller bearings, which are only intended to absorb radial loads, are exposed to unforeseen axial loads as a result of unfavorable operating and installation conditions, for which the spherical roller bearing is not designed. A typical case is, for example, a floating bearing for a shaft bearing which, due to unfavorable operating or installation conditions, cannot follow a longitudinal thermal expansion of a shaft to be supported and is therefore axially loaded. In such bearings, both bearing rings have so far been designed as closed bearing rings.

According to a preferred embodiment of the invention, it can be advantageous for the groove to be arranged outside the area of the force flow which arises from the contact of the rolling elements with the outer ring. In this way it can be achieved that the load-bearing capacity of the roller bearing arrangement is not impaired by a definable length and location of the elongated hole outside the area of the force flow that is created by the contact of the rolling elements with the outer ring. This creates a roller bearing arrangement which meets the requirements with regard to the axial displacement of a floating bearing and the requirements with regard to the load-bearing capacity.

It can also be advantageous that the diameter of the retaining bolt is smaller than the width of the elongated hole; in particular, it can be advantageous that the diameter of the retaining bolt is approximately 5% less, so that a reduced diameter of the retaining bolt in relation on the width of the elongated hole, a defined displacement in the circumferential direction (e.g. due to a play between the retaining bolt and the groove) of the roller bearing arrangement in the bearing seat, whereby a roller bearing arrangement is created that is also optimized with regard to the assembly properties.

The invention will be explained in more detail below with reference to figures without restricting the general inventive concept.

• 1 eine Wälzlageranordnung in einer Aufsicht,
• 2 eine Wälzlageranordnung als Axialschnitt in einer Teilansicht, und
• 3 eine Aufsicht eines Teilausschnittes eines Außenrings.

Show it:

• 1 a rolling bearing arrangement in a plan view,
• 2 a roller bearing arrangement as an axial section in a partial view, and
• 3rd a plan view of a partial section of an outer ring.

1 shows an embodiment of the roller bearing arrangement according to the invention 1 who have favourited a rolling bearing 2 includes. The roller bearing 2 has an inner ring 3rd and the outer ring 4th as well as rolling elements arranged in between 5 separated from each other by a cage 6th are spaced. The following is on the outer ring 4th entered into more detail.

The 2 shows a partial section of an axial section of a roller bearing arrangement 1 who have favourited a rolling bearing 2 includes. The roller bearing 2 has rolling elements 5 between an inner ring 3rd and an outer ring 4th are arranged. The rolling elements 5 that act as pendulum rollers 9 are formed by a cage 6th spaced from each other. The outer ring 4th has at least one extending in the axial direction and as an elongated hole 10 trained groove 11 on. The groove 11 forms the receptacle for one in a bearing seat 12th fixedly arranged retaining bolts 13th . In the interaction of the elongated hole 10 and retaining bolts 13th becomes the rolling bearing 2 guided in the axial direction.

The 2 also shows that the elongated hole 10 such on the outer ring 4th is arranged that the Long hole 10 is located outside the area of the force flow, which is from the contact of the rolling elements 5 with the outer ring 4th arises. In the illustrated embodiment, the extent of the elongated hole 10 in its longitudinal direction accordingly has a length which is approximately the axial spacing between two circumferentially adjacent pendulum rollers 9 corresponds, and is the elongated hole 10 also arranged in the central area between these two rows of spherical rollers.

The 3rd shows a plan view of the outer ring 4th , which are also from the 2 basically known rolling bearing arrangement 1 , which is a rolling bearing 2 includes. The one as an elongated hole 10 trained groove 11 serves to accommodate the retaining bolt 13th , with an interaction of elongated hole 10 and retaining bolts 13th a shift in the axial direction that corresponds to the requirements of a floating bearing.
The 3rd further shows that the diameter of the retaining bolt 13th is slightly less than the width of the elongated hole 10 , creating a defined shift (in the area of play between retaining bolts 13th and outer ring 4th ) is made possible in the circumferential direction.

The invention is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as restrictive but rather as explanatory. The following patent claims are to be understood in such a way that a named feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. If the patent claims and the above description define “first” and “second” features, this designation serves to distinguish between two similar features without defining an order of precedence.

List of reference symbols

1

Roller bearing arrangement

2 3

Rolling bearing inner ring

4 5

Outer ring rolling element

6th

Cage

7th

Inner ring raceway

8th

Outer ring raceway

9

Spherical rollers

10

Long hole

11

Groove

12th

Bearing seat

13th

Retaining bolt

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 19611723 A1 [0003]

Claims (3)

Rolling bearing arrangement (1) comprising a rolling bearing (2) with an inner ring (3), an outer ring (4), a plurality of rolling elements (5) and a cage (6), the inner ring (3) having an inner ring raceway (7) and the outer ring (4) has an outer ring raceway (8), the rolling elements (5) rolling between the inner ring (3) and the outer ring (4) being mounted and spaced apart from one another by the cage (6), and the rolling elements (5) are designed as spherical rollers (9), the roller bearing (2) being designed as a floating bearing, characterized in that the outer ring (4) has at least one groove (11) running in the axial direction and designed as an elongated hole (10), the groove (11) forms the receptacle for a retaining bolt (13) arranged in a stationary manner in a bearing seat (12), so that the roller bearing (2) is guided in the axial direction. Rolling bearing arrangement, according to Claim 1 , characterized in that the groove (11) is arranged outside the area of the force flow which arises from the contact of the rolling elements (5) with the outer ring (4). Rolling bearing arrangement according to one of the preceding claims, characterized in that the retaining bolt (13) is smaller in diameter than the width of the elongated hole (10), in particular the diameter of the retaining bolt (13) is about 5% smaller than the width of the elongated hole (10).

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