DE102011075247A1 - roller bearing - Google Patents

Abstract

The invention relates to a rolling bearing with two sets of rolling elements, wherein for slip-free rolling contact in a load state of low load, a set of rolling elements with spherical rolling surfaces (1) and with respect to the other set of rolling elements slightly larger diameter is formed. According to the invention, the rolling elements with spherical rolling surfaces (1) are formed so as to be at least partially flattened from the spherical shape for geometrical adaptation to a predetermined installation space in the non-load-bearing area.

Description

Field of the invention

The invention relates to a roller bearing with two sets of rolling elements, wherein for slip-free rolling contact in a load state of low load, a set of rolling elements with spherical rolling surfaces and with respect to the other set of rolling elements slightly larger diameter is formed.

Background of the invention

Such a rolling bearing is out DE 103 38 207 B4 known. There, a double-row slip-free spherical roller bearing is described in which each row of rolling elements consists of balls and rollers. In order to ensure a slip-free operation of the pendulum roller bearing in a low load condition, the smallest outer diameter of the balls is made larger than the largest outer diameter of the rollers. A disadvantage of this embodiment, the fact that the oversized balls claim a large space. As a result, in particular narrow bearing series with the same load capacity can not be realized.

Object of the invention

Based on the stated disadvantages of the known prior art, the invention is therefore based on the object to make a rolling bearing of the aforementioned type to a predetermined space customizable.

Summary of the invention

According to the invention this object is achieved in a rolling bearing according to the preamble of claim 1 such that the rolling elements are formed with spherical Wälzflächen in the non-bearing area at least partially flattened from the spherical shape deviant. In this way, the rolling bearing can be geometrically adapted to a predetermined space with the same capacity, in particular be designed with reduced axial width.

Preferably, the rolling elements are designed with spherical rolling surfaces as ball rollers with flattened parallel side surfaces. As a result, particularly narrow series of slip-free bearings are possible.

In a particularly preferred embodiment of the invention, the rolling bearing is designed as a slip-free spherical roller bearing with a set barrel rollers and a set of ball rollers.

Preferably, the spherical roller bearing two rows of barrels and ball rollers axially adjacent to each other, wherein in each row of barrel rollers and ball rollers are arranged alternately one behind the other. As a result, an optimized ratio of slip avoidance and load capacity as well as a uniform distribution of the masses and the load in the rolling bearing is achieved.

To simplify manufacturing and assembly, the barrel and ball rollers of both rows of rollers can be arranged in a common roller cage.

Preferably, the barrel rollers are each formed with a diameter which is greater than their length. Such so-called "over-square" barrel rollers have a high rigidity and at the same time enable a particularly narrow and high construction of the spherical roller bearing.

In a further particularly preferred embodiment of the invention, the barrel and ball rollers are arranged such that a barrel roll of a row of rollers of a ball roller of the other row of balls or a ball roller of a row of barrels of a barrel roller of the other row axially opposite. As a result, slip-free spherical roller bearings in narrow series are made possible, which are also easy to manufacture and assemble. It is also conceivable to arrange the respective opposite barrel and ball rollers slightly offset from one another.

The barrel rollers can be performed in a simple manner by arranged between the rows of rollers guide means. Such guide means may be formed, for example, as a co-rotating separate guide ring or integrally with the bearing inner ring as a so-called "mid-board".

Brief description of the drawings

Further features of the invention will become apparent from the following description and from the drawings, in which an embodiment of the invention is shown in simplified form. Showing:

1 a perspective partial view of a rolling bearing according to the invention,

2 a schematic partial section of the rolling bearing.

Detailed description of the drawings

In 1 a section of a slip-free rolling bearing according to the invention is shown, the is designed as a double-row spherical roller bearings. Between a bearing inner ring 6 and a bearing outer ring, not shown, rolling elements are guided in two rows axially next to each other. Each of the two rows of rollers consists of barrel rollers 3 and ball rollers, which are arranged alternately one behind the other in the circumferential direction. The ball rollers have spherical rolling surfaces 1 on, in the deviating from the spherical shape flattened parallel side surfaces 2 end up. When unloaded, the ball rollers are located on the spherical rolling surfaces 1 in punctiform rolling contact, while the barrel rollers 3 have a line-shaped rolling contact. Opposite the barrel rolls 3 the ball rollers are designed with a slightly larger diameter. In the low load phase, the ball roller set ensures slip-free operation. The barrel rolls 3 come in the high load phase to bear. Due to the higher load, the ball rollers deform elastically to the higher stiffness having barrel rollers 3 Be compatible with their smaller diameter. barrel rollers 3 and ball rollers of both rows are in a Wälzkörperkäfig 4 arranged and lie each other obliquely opposite.

2 shows in an axial partial section schematically the arrangement of the two rows of rollers side by side guided barrel rollers 3 and ball rolling. At the bearing outer ring is the raceway 7 designed spherically for the rolling elements. The barrel rolls 3 and the ball rollers stand on the spherical track 7 the bearing outer ring itself. Bearing inner ring 6 , Rolling element cage 4 and rolling elements can be so pivot by a few degrees from a central position to compensate for misalignment, in particular the deflection of a wave. Compared to the conventional rolling element "ball" all non-bearing areas are removed on the ball roller. The conventional spherical shape is indicated by dashed lines. The result is a ball flattened on both sides with parallel side surfaces 2 , In this way, the ball roller is considerably narrower than a ball. As a result, corresponding space can be saved or the ball roller can be adjusted in its axial width to a predetermined space.

The barrel rolls 3 be through guidance means 5 on the bearing inner ring 6 guided. The guiding means 5 are arranged centrally between the rows of runs and formed here by way of example as a separate guide ring. The barrel rolls 3 , in particular their length, and the guide ring define a spherical roller bearing space, which remains to receive the ball rollers. The ball rollers must correspond to the curvature of the spherical track 7 can kinematically align on the bearing outer ring, without causing any overlap with the guide ring and the barrel rollers 3 comes. In the illustrated embodiment, so-called "over-square" barrel rollers 3 used, whose diameter is greater than their length. The one by the barrel rolls 3 and the guide ring given spherical roller bearing space is relatively small. The ball rollers are by flattening on the side surfaces 2 designed correspondingly narrow so that they fit geometrically in the given spherical roller bearing space. In this way, ball rollers can be used whose diameter is greater than the length of the barrel rollers 3 , This makes it possible to execute multi-row slip-free spherical roller bearings in particularly narrow and high series.

LIST OF REFERENCE NUMBERS

1

 rolling surface

2

 side surface

3

 tons role

4

 Rolling Element

5

 guide means

6

 Bearing inner ring

7

 career

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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

• DE 10338207 B4 [0002]

Claims (6)

Roller bearing with two sets of rolling elements, wherein for slip-free rolling contact in a load condition of low load, a set of rolling elements with spherical Wälzflächen ( 1 ) and with a relative to the other set of rolling elements slightly larger diameter is formed, characterized in that the rolling elements with spherical Wälzflächen ( 1 ) are adapted to geometrically adapt to a predetermined space in the non-supporting area at least partially deviating from the spherical shape deviating. Rolling bearing according to claim 1, characterized in that the rolling elements with spherical rolling surfaces ( 1 ) as ball rollers with parallel side surfaces ( 2 ) are executed. Rolling bearing according to claim 1 or 2, characterized in that the rolling bearing as a spherical roller bearing with a set of barrel rollers ( 3 ) and a set of ball rollers is formed, wherein in two rows of rollers each barrel rollers ( 3 ) and ball rollers alternately in a row in a Wälzkörperkäfig ( 4 ) are arranged. Rolling bearing according to one of claims 1 to 3, characterized in that the barrel rollers ( 3 ) each have a diameter which is greater than their length. Rolling bearing according to one of claims 1 to 4, characterized in that a barrel roll ( 3 ) of a row of a ball roller of the other row of rollers axially opposite and vice versa. Rolling bearing according to one of claims 1 to 5, characterized in that for guiding the barrel rollers ( 3 ) between the rows of rollers arranged guide means ( 5 ) are provided.

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