WO2008031402A1

WO2008031402A1 - Roller bearing

Info

Publication number: WO2008031402A1
Application number: PCT/DE2007/001592
Authority: WO
Inventors: Oswald Bayer
Original assignee: Schaeffler Kg
Priority date: 2006-09-12
Filing date: 2007-09-05
Publication date: 2008-03-20
Also published as: DE102006042676B4; DE102006042676A1

Abstract

Roller bearing, comprising an outer ring and an inner ring with respective bearing surfaces for rolling elements disposed between the same, wherein two or more clamping elements (9) cooperating with the rolling elements (6) rolling over the same that are radially displaceable against a reset force, are integrated in the bearing surfaces (3, 5) of the outer or inner rings (2, 4).

Description

Name of the invention

roller bearing

description

Field of the invention

The invention relates to a rolling bearing comprising an outer ring and an inner ring with respective running surfaces for arranged between these Wälz- body.

Background of the invention

Sometimes it comes with the use of such bearings, for example in the form of Radialzylinderrollenlagem to a roller or cage slip.

In roller slip, a single or multiple roller does not support the load; in case of cage slippage, which can occur with double bearings, a complete roller ring does not support the load. However, such slippage should be avoided. Also known are rolling bearings that require a precise game setting in use, which is technically complicated manufacturing technology and installation. Exists such a bearing, for example, by temperatures prevailing in the operation temperature expansion, this results in a Spielver change, too much strain can lead to high radial biases, leading to a high lubricant stress and thus to a shortening of the service life or a spontaneous failure Hot run can lead.

Summary of the invention

The invention is thus based on the problem to provide a rolling bearing in which a slip largely excluded and the game setting is simplified.

To solve this problem is provided according to the invention in a rolling bearing of the type mentioned that in the career of the outer or inner ring two or more against a restoring force radially movable and with the rolling elements rolling over them cooperating clamping elements are integrated.

In the rolling bearing according to the invention two or more clamping elements are provided with particular advantage, which are integrated into the running surface of one of the rings, so ultimately form a part of the tread. These clamping elements are radially movable against a restoring force.

In an integration in the running surface of the outer ring, the clamping elements are biased radially inwardly by this restoring force, in an integration in the running surface of the inner ring, the clamping elements are pressed radially outward over the restoring force. In any case, they are biased towards the rolling elements. If, for whatever reason, in principle, one or more rollers would not run on both, but only on one running surface, then it is ensured via these tensioning elements that this or these rolling elements are still in contact with it Running surface stand, as the one or more of the clamping elements in this case out of the tread feathers out in the Wälzkörperbereich and form the tread for the or the "slipping" rolling elements.

Consequently, slippage can be avoided by way of these clamping elements cooperating with the rolling elements.

In addition, the game setting is simplified. Because as a result of the spring travel of the clamping elements in the region of the rolling elements consequently a larger game can be bridged, that is, it is ensured via the exposed from the respective tread clamping elements that the rolling elements always on the opposite tread as well as on the clamping elements to run.

If, for example, during operation, a temperature difference results, which leads to a thermal expansion, then the play is compensated for stretching, the clamping elements are pushed back against the restoring force on the rolling elements, the rolling elements then run properly on both treads, without causing excessive radial stresses comes.

The clamping elements themselves are preferably designed as arc segments and received in a formed in the tread, groove. This groove can be radially limited. Trained as arc segments clamping elements complement each other preferably in the circumferential direction to form a ring, so that all rolling elements can be biased on the arc segments. Preferably, two arc segments, each extending around 180 °, provided. In principle, however, it is also conceivable to use three arc segments extending through approximately 120 ° or four by approximately 90 °.

In order to act on each clamping element with the restoring force, each clamping element is coupled with at least one movably received in a radial recording and acted upon by the restoring force pressure piece in the invention. Such a pressure piece may be a preferably cylindrical pin, which in a corresponding radial bore, which passes through the outer or inner ring and in the groove in which the arc segments are received, opens, executed. When using a cylindrical pin, the hole is also cylindrical. However, it is also conceivable to use an arcuate pressure plate, which is quasi designed as a relatively wide ring segment and is inserted in a corresponding slot receiving, which in turn opens in the groove receiving the arc segments.

To generate the restoring force, an annular spring surrounding the respective outer sides of the respective ring is advantageously provided. For this purpose, a corresponding receiving groove may be provided on the outer ring or on the inner ring on the opposite side of the respective running surface into which the annular spring is snapped. This annular spring loads the plungers, no matter how they are formed, about which the Mindestvor- tension is set. This ensures that each rolling element is always sufficiently loaded and no cage or roller slip occurs. About the appropriate design of the annular spring, the bias can also be adjusted accordingly. By an appropriate vote of the spring and the radial play and too much pre-tension can be avoided, the bearing is always free of play, so that the necessary backlash-free guidance is ensured, for example, when used to support a machine tool spindle. Instead of using a circumferential annular spring, it is basically also conceivable to provide hydraulic or pneumatic tensioning means, that is to say corresponding elements which are acted upon hydraulically or pneumatically and interact with the pressure pieces.

To avoid any edge pressure, it is expedient if the clamping elements in the depressed in the tread position lie flat and edge-free in the tread. This can be ensured by the fact that after inserting the clamping elements in the tread this surface is again ground, so that the tread including the arc segments is ground again, creating a completely flush integration of the arc segments in the tread without any remaining edges and the like is obtained.

Preferably, corresponding clamping elements or arc segments are integrated at both ends of the tread. If the rolling elements are rollers, they are therefore supported at both ends. In principle, however, it is also conceivable to integrate the clamping elements only in the center of the running surface, seen axially, and thus only to perform a central support.

Brief description of the drawings

Further advantages, features and details of the invention will become apparent from the embodiment described below and with reference to the drawings. Showing:

Fig. 1 shows an inventive rolling bearing in section, and

2 is an enlarged view of the area H of FIG. 1. Detailed description of the drawing

Fig. 1 shows an inventive rolling bearing 1, consisting of an outer ring 2 with a tread 3, an inner ring 4 with a tread 5 and a plurality of arranged between these treads rolling elements 6. The rolling elements 6 are as known in a cage 7 out.

Shown here is a single-row cylindrical roller bearing, in the rolling elements 6 are cylindrical rollers. In principle, however, it is also conceivable to design a two-row or multi-row bearing in the manner according to the invention described below.

In the running surface 3 of the outer ring 2 3 clamping elements 9 are integrated here at the two axial ends of the tread. These clamping elements 9 are here designed as arcuate segments 10, so as a metallic arcuate ring sections, wherein at least two such arc segments 10 are provided around the circumference, which complement each other to form a complete ring. It would also be conceivable, in principle, to provide three such arcuate segments 10 120 ° or four arc segments 90 °.

The arc segments 10 are received in a respective groove 11 which is incorporated in the tread. The groove is radially bounded so that the arc segments 10 can only spring in until their running surface 12 is completely flush with the running surface 3 of the outer ring 2, that is, they are complemented.

From the circumferential groove 11 go per bow segment one or more radial, extending to the outside of the outer ring 3 receptacles 13 in the form of holes 14 from. In these bores 14 each a pressure piece 15, here in the form of a cylindrical pin 16, is provided, which rests directly on the associated arc segment 10. The bore 14 widens to a groove 17, in which a clamping device 18, here in the form of an annular spring 19, is added.

This annular spring 19 presses on the pins 16, which in turn press on the arc segments 10. Hereby, therefore, the arc segments 10 are stretched against the rolling elements 6, they are, seen radially, pressed inwards and thus pushed out of the tread 3. The rolling elements 6 are thus biased by these spring-loaded clamping elements 9 is biased against the tread 5 of the inner ring 4.

Obviously, a roller or cage slip can be avoided by this, even if one or more rolling elements 6 do not run on the running surface 3 of the outer ring 2, but the rolling elements 6 run at least on the running surfaces 12 of the arc segments 10. So there is always a bearing contact in the tread 3 given.

It is also ensured with such a bearing that it is always free of play, since even with the formation of a defined game, so if between rolling elements 6 and the outer ring 3 a defined minimum game is provided from the house, this game will be bridged over the spring-loaded clamping elements 9 can, so that over such bearings in each case a play-free guidance is achieved, at the same time record or compensate for considerable thermal expansions.

Although it is basically sufficient to provide only one pressure piece 15 even with circulating about 180 ° arc segments, it is expedient to arrange over the length of the sheet segment 10 a plurality of such pressure pieces, for example two or three, so that the pressure piece at several points, preferably symmetrically loaded by the tensioning device 18. However, the plungers 15, as described, for example metal pin, but may also have an elongated shape, the receptacle 13 would then be designed as a radial slot, in which the pressure piece is inserted. This can realize a larger smoother contact zone between the pressure piece 15 and the arc segment 10.

Instead of the integration of the clamping elements 9 shown in FIGS. 1 and 2 in the running surface 3 of the outer ring 2, it is also conceivable to integrate such clamping elements 9 in the running surface 5 of the inner ring 4. The construction would then ultimately be the same, but would the respective clamping device 18, as which also an annular spring 19 can be used, the pressure pieces 15 load radially outward, so that the arc segments 10 are spring-biased radially outwardly against the adjacent rolling elements, and this be clamped against the tread 3 of the outer ring 2.

Furthermore, it is basically also conceivable, instead of the two-sided integration of the clamping elements in the respective tread to integrate 3 or 5 clamping elements only in the middle of the respective tread, that is, the rolling elements would be supported only centrally in this case (axially).

reference numerals

1 rolling bearing

2 outer ring

3 tread

4 inner ring

5 tread

6 rolling elements

7 cage

9 clamping element

10 arc segments

11 groove

12 tread

13 recording

14 hole

15 pressure piece

16 cones

17 groove

18 clamping device

19 ring spring

Claims

claims

1. Rolling bearing comprising an outer ring and an inner ring with respective running surfaces for rolling elements arranged between them, characterized in that in the running surface (3, 5) of the outer or the inner ring (2, 4) two or more against a restoring force radially movable and with the ones overrun

Rolling elements (6) cooperating clamping elements (9) are integrated.

2. Rolling bearing according to claim 1, characterized in that the arc segments (10) running clamping elements (9) in a in the running surface (3, 5) formed, groove (11) are accommodated.

3. Rolling bearing according to claim 2, characterized in that the arc segments (10) in the circumferential direction to a ring er whole.

4. Rolling bearing according to claim 3, characterized in that two by 180 °, three by 120 ° or four by 90 ° encircling arc segments (10) are provided.

5. Rolling bearing according to one of the preceding claims, characterized in that each clamping element (9) with at least one in a radial receptacle (13) movably received and acted upon by the restoring force pressure piece (15) is coupled.

6. Rolling bearing according to claim 5, characterized in that a pressure piece (15) is designed as a preferably cylindrical pin (16) or as an arcuate pressure plate.

7. Rolling bearing according to claim 5 or 6, characterized in that for generating the restoring force on the respective outer side of the respective ring (2, 4) encircling annular spring (19) hen is provided.

8. Rolling bearing according to claim 7, characterized in that the annular spring (19) is received in an annular groove (17).

9. Rolling bearing according to one of the preceding claims, characterized in that the clamping elements (9) in the in the tread (3, 5) depressed position flat and edge-free in the tread (3, 5).

10. Rolling bearing according to one of the preceding claims, characterized in that at both ends of a tread (3, 5) o- - axially seen - in the middle of the tread (3, 5), the clamping elements (9) are integrated.