WO2011064060A1

WO2011064060A1 - Rolling bearing having a measurement scale

Info

Publication number: WO2011064060A1
Application number: PCT/EP2010/066214
Authority: WO
Inventors: Jörg-Oliver Hestermann
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2009-11-30
Filing date: 2010-10-27
Publication date: 2011-06-03
Also published as: DE102009056355A1

Abstract

The invention relates to a rolling bearing (1) having a measurement scale, wherein the rolling bearing (1) has bearing rings (2, 3), namely a bearing inner ring (2) and a bearing outer ring (3) which is spaced apart from and rotatable relative to the bearing inner ring (2), between which a plurality of rolling bodies (4) are arranged. According to the invention, the measurement scale has an encoder element (10) which can be detected by a sensor element (12) and which is attached to an axial end face (6) of a bearing ring (2, 3).

Description

Name of the invention

Rolling bearings with a material measure Description

Field of the invention

The invention relates to a rolling bearing with a material measure, wherein the rolling bearing has bearing rings, namely a bearing inner ring and a preferably radially spaced therefrom, rotatable relative to the bearing inner ring bearing outer ring, between which a plurality of rolling elements are arranged.

Background of the invention

From the prior art, such as DE 19640895 B4 rolling bearings with integrated speed measuring devices are known.

For example, DE 19640895 B4 discloses a rolling bearing with an integrated speed measuring device, which contains a bearing inner ring, a bearing outer ring and rolling elements arranged there between for radial mounting, wherein the speed measuring device has at least one measured value sensor and a measured value encoder ring which at a the bearing rings is fixed and has on its outer lateral surface a scale extending in the circumferential direction or material measure, wherein the bearing inner ring is rotatably mounted on the bearing outer ring in addition to Axialwälzlagern and wherein the donor ring forms a track for one of the two Axialwälzlager.

Such an integrated measuring system has the advantage compared to external measuring systems, which are connected via a coupling with a rotation axis, that it significantly reduces the tendency to oscillate due to the direct connection of the material measure to the rotating part. This is particularly especially when used in machine tools to achieve a particularly high controller gain of great advantage.

However, the device disclosed in DE 10640895 B4 has the disadvantage that it can only be realized for some types of construction. Thus, it is assumed there of a material measure on a radial lateral surface, which thus must be accessible to the rotating part of the rolling bearing radially from the outside for a sensor element. This causes problems in the design of the bearing rings. Object of the invention

Based on the solutions of the known prior art, the invention is therefore based on the object to provide an integration of the scale, which is inexpensive to produce, only a small space requires-, high accuracy allows, is also easy to implement and large Auslegungsfreiheitsgrade for Provides.

DESCRIPTION OF THE INVENTION According to the invention, this object is achieved in that the measuring graduation has a sensor element detectable by a sensor element, which is attached to a non-cylindrical surface of the bearing rings. This also applies in particular to the axial surfaces. Even with Wälzlagerformen that do not allow the connection of a radial lateral surface with a donor element, the attachment of the material measure by the inventive design can be ensured. Especially with machine tools, a precise measurement of the angle and / or the rotational speed is then made possible without additional space for the dimensional embodiment has to be provided. This invention lends itself particularly to rolling bearings in which the bearing outer ring is radially spaced from the bearing inner ring. Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Thus, it is advantageous if the transmitter element is arranged on the axial surface of the rotating bearing inner ring or on the axial surface of the rotating bearing outer ring. In this way, a pre-assembly is easy to ensure and a power supply of the sensor element can be easily accomplished.

It is also advantageous if the donor element has a scale.

To require very little space, it is advantageous if the transmitter element is anchored in a recess which may be formed as a groove and may be formed circumferentially on the axial surface. If the stationary sensor element is arranged axially in relation to the transmitter element, then, for example, a reaction is induced inductive in the sensor element via a small air gap existing between the transmitter element and the sensor element, which reaction can be forwarded to an evaluation and then opened accordingly about the angle changes and / or the rotational speed allows. The precision of the measurement is thereby increased. In a particular embodiment, the sensor element is attached to the bearing outer ring.

The assembly is simplified when a carrier device ensures the connection between the bearing outer ring and the sensor element.

In order to make the measuring system particularly stiff, it is advantageous if the sensor element is an integral part of the carrier device.

The positionability and presettable of the rolling bearing is facilitated when the support device is in contact with a radial peripheral surface of the bearing outer ring. It is also advantageous if the rolling bearing is designed as a cross roller bearing or as angular contact ball bearings, such as an axial angular contact ball bearing. Especially such embodiments have been proven in machine tools, such as CNC machines, lathes or milling machines.

If the rolling bearing is sealed, the life of the bearing can be significantly increased. It is also possible that the material measure is realized in the form of a magnetic paste, for example. By the fact that the donor element is introduced from magnetic paste in an introduced on the axial surface of the bearing inner ring recess. Even massive components that serve as a donor element can be brought into a corresponding recess on the axial surface of the bearing outer ring, such as by shrinking, gluing or screwing. Similar to the rotating bearing inner ring, this also applies to a rotating bearing outer ring. Brief description of the drawings

The invention will be explained in more detail in several preferred embodiments with reference to the accompanying drawings. Showing:

Figure 1 shows a first embodiment of an inventive

Rolling bearing in cross-sectional view;

Figure 2 shows a second embodiment of an inventive

Rolling bearing in cross-sectional view;

Figure 3 shows a third embodiment of an inventive

Rolling bearing in cross-sectional view; Figure 4 shows a fourth embodiment of a rolling bearing according to the invention in cross-sectional view.

Detailed description of the drawings

The figures are merely a schematic representation and serve only to understand the invention. The same reference numerals are used for the same elements. FIG. 1 shows a first embodiment of a roller bearing 1. This rolling bearing is shown only with its upper half and configured as the rolling bearing 1 in the embodiment of Figure 2 as a cross roller bearing. The rolling bearing 1 has a bearing inner ring 2 and a bearing outer ring 3. Between the bearing inner ring 2 and the bearing outer ring 3 rolling elements 4 are indicated. The rolling elements 4 are formed in the embodiment shown in Figures 1 and 2 as rollers, which are arranged offset in the circumferential direction by 90 ° to each other. Between these rollers, which serve as rolling elements 4, there may be intermediate pieces. The bearing outer ring 3 surrounds radially and slightly offset in the axial direction, at least a majority of the radial peripheral surface of the bearing inner ring 2. Sealing elements 5 ensure a sealing effect, so that no contamination, liquid or dirt can reach the area of the rolling elements 4.

On a non-cylindrical surface, namely an axial surface 6 of the bearing inner ring rotatably arranged in the embodiment according to FIG. 1, a depression 7 is provided. The recess 7 is formed as a groove 9 radially surrounding a rotation axis 8. Inside the groove 9, a donor element 10 is arranged. This donor element 10 ultimately represents the material measure. The donor element 10 may for example be made solid or consist of magnetic paste.

Both in the bearing inner ring 2 and in the bearing outer ring 3 through holes 1 1 are present. The through holes 1 1 can also by non-chipping shaping, z. B. be created by reshaping measures and be designed as a positive engagement enabling element arrangement. The sealing bodies 5 are in sliding contact either with the bearing inner ring 2 and / or with the bearing outer ring 3. It is possible that the two sealing bodies abut either on the bearing inner ring 2 or the bearing outer ring 3, or else a sealing body 5 on the bearing inner ring 2 and the other sealing body 5 abuts the bearing outer ring 3 in a grinding manner.

Spaced axially to the encoder element 10, a sensor element 12 is arranged bearing outer ring fixed. In this case, the sensor element 12 is integrated in a carrier device 13. The carrier device 13 acts as a housing. In contrast to the exemplary embodiment in FIG. 1, in the exemplary embodiment according to FIG. 2 the sensor element 12 is a separate component, which is attached to the carrier device 13. In this case, for example, a screw connection is realized. In both embodiments, a screw connection, not shown, is also realized between the carrier device 13 and the bearing outer ring 3.

Another difference between the first and the second embodiment is that in the second embodiment, the support device 13 is flush on the radially outer peripheral surface of the bearing outer ring 3. In a relative movement of the sensor element 12 to the encoder element 10, a change in state takes place, which is detectable by the sensor element 12 and can be forwarded via unillustrated line devices to an evaluation unit. In a modification of the first two embodiments, an axial angular contact ball bearing of the rolling bearing 1 is realized in the third and fourth embodiments shown in Figures 3 and 4 instead of a cross roller bearing. Again, between the sensor element 12 and the encoder element 10th a small gap 14 is present. The bearing inner rings 2 of the third and fourth embodiment are designed in two parts. Also, the rolling elements 4 are not configured as rollers, but as balls, wherein a part of the ball 15 positioning the ball relative to each other can be seen.

While in the third exemplary embodiment, according to FIG. 3, the carrier device 13 is designed to be integrated with the sensor element 12, in the exemplary embodiment according to FIG. 4 these two elements are configured separately and combined with one another via a screw connection (not shown).

Also in the two embodiments according to Figure 3 and Figure 4 are sealing body 5 to ensure a long life and prevention of the ingress of contaminants available. In the present exemplary embodiment, the sealing bodies 5 are connected to the uniformly designed bearing outer ring 3 and in sliding contact with a radial circumferential surface of the bearing inner ring 2.

The shaft bearings shown can absorb both axial and radial forces and are therefore particularly suitable for use in high-quality machine tools. It lends itself to the use in particular in CNC, lathes and / or milling machines. The rolling bearings of the illustrated embodiments are configured as backlash-free bearing, but may have a game of 20-50 μιτι, provided that the gap 14 is greater than the respective bearing clearance dimensioned to a touchdown of the sensor element 12 on the axial surface 6 of the bearing inner ring 2, and thus also on the encoder element 10, to prevent. However, the invention can also be realized with pure axial or radial bearings. LIST OF REFERENCE NUMBERS

roller bearing

Bearing inner ring

Bearing outer ring

rolling elements

sealing body

axial surface

deepening

axis of rotation

groove

transmitter element

Through Hole

sensor element

support device

gap

Cage

Claims

claims

1 . Rolling bearing (1) with a material measure, wherein the rolling bearing (1) bearing rings (2, 3), namely a bearing inner ring (2) and a spaced relative to the bearing inner ring (2) rotatable bearing outer ring (3), between which a plurality of rolling elements ( 4), characterized in that the measuring graduation comprises a sensor element (10) detectable by a sensor element (10) which is attached to a non-cylindrical surface of the bearing rings (2, 3).

Second rolling bearing (1) according to claim 1, characterized in that the encoder element (10) on the axial surface (6) of the rotating bearing inner ring (2) or on the axial surface of the rotating bearing outer ring (3) is arranged.

3. rolling bearing (1) according to claim 1 or 2, characterized in that the transmitter element (10) has a scale.

4. rolling bearing (1) according to one of claims 1 to 3, characterized marked, that the encoder element (10) in a recess (7) is anchored, which can be formed as a groove (9) and on the axial surface (6). may be formed circumferentially.

5. Rolling bearing (1) according to one of claims 1 to 4, characterized marked, that axially to the encoder element (10) spaced from the stationary sensor element (12) for cooperation with the encoder element (10) is arranged.

6. Rolling bearing (1) according to claim 5, characterized in that a carrier device (13) ensures the connection between the bearing outer ring (3) and the sensor element (12).

7. rolling bearing (1) according to claim 6, characterized in that the sensor element (10) is an integral part of the support device (13).

8. Rolling bearing (1) according to claim 6 or 7, characterized in that the carrier device (13) with a radial peripheral surface of the bearing outer ring (3) is in contact.

9. Rolling bearing (1) according to any one of claims 1 to 8, characterized marked, that the rolling bearing (1) is designed as a cross roller bearing or angular contact ball bearings, such as an axial angular contact ball bearings.

10. Rolling bearing (1) according to one of claims 1 to 9, characterized in that the rolling bearing (1) is designed sealed.