Sensor Device for a Rolling Bearing and Rolling Bearing Arrangement Comprising Such a Sensor Device

Abstract

Sensor devices for a rolling bearing and roller bearings including said sensors are disclosed. The sensor device may include at least one sensor configured to connect to one bearing race in a manner fixed against relative rotation. At least one signal transmitter may be configured to connect to the other of the bearing races in a manner fixed against relative rotation. The sensor device may further include an outer ring configured to be fastened on an end face of the outer race of the rolling bearing and an inner ring configured to be fastened on an end face of the inner race of the rolling bearing. The sensor and the signal transmitter may be arranged on mutually opposite lateral surfaces of the outer and inner rings.

Claims

1. A sensor device for a rolling bearing having an outer race and an inner race, which is rotatable relative to the outer race, wherein the sensor device comprises: at least one sensor configured to connect to one of the two bearing races in a manner fixed against relative rotation, at least one signal transmitter configured to connect to the other of the two bearing races in a manner fixed against relative rotation, wherein the sensor device further comprises an outer ring configured to be fastened on an end face of the outer race of the rolling bearing, and an inner ring configured to be fastened on an end face of the inner race of the rolling bearing, wherein the sensor and the signal transmitter are arranged on mutually opposite lateral surfaces of the outer and inner rings.

2. The sensor device as claimed in claim 1, wherein the sensor is arranged on a flexible circuit board fastened on the lateral surface of the outer or the inner ring.

3. The sensor device as claimed in claim 2, wherein the circuit board is fixed on the lateral surface by potting compound.

4. The sensor device as claimed in claim 1, wherein the outer ring is designed as an open ring.

5. The sensor device as claimed in claim 1, wherein said sensor device is configured to be fastened on the rolling bearing by an adhesive film.

6. The sensor device as claimed in claim 5, wherein the adhesive film comprises a first circumferential portion in a region of the inner ring and a second circumferential portion in a region of the outer ring, and the first and second portions are connected to one another by a plurality of parting webs, wherein the parting webs are configured to break when there is a force acting in a circumferential direction during initial startup.

7. The sensor device as claimed in claim 1, wherein the inner ring is embodied as a flinger disk.

8. The sensor device as claimed in claim 2, wherein said sensor device has a connection cable for connection to an evaluation unit, wherein the connection cable is fastened on the circuit board and is passed out of the outer ring in a region of a missing circular ring segment.

9. The sensor device as claimed in claim 2, wherein a power supply and sensor-electronic components are arranged on the circuit board, and the elements arranged on the circuit board are connected electrically by conductor tracks.

10. A rolling bearing arrangement comprising a rolling bearing having an outer race and an inner race, which is rotatable relative to said outer race, and comprising a sensor device as claimed in claim 1, which is connected to the rolling bearing.

11. A rolling bearing arrangement, comprising: an outer race and an inner race that is rotatable relative to the outer race; and a sensor device, including: a sensor configured to connect to one of the outer race or the inner race in a manner fixed against relative rotation; a signal transmitter configured to connect to the other of the outer race or the inner race in a manner fixed against relative rotation; an outer ring attached to an end face of the outer race of the rolling bearing; and an inner ring attached to an end face of the inner race of the rolling bearing; wherein the sensor and the signal transmitter are arranged on mutually opposite lateral surfaces of the outer and inner rings.

12. The rolling bearing arrangement as claimed in claim 11, wherein the sensor is arranged on a flexible circuit board attached to the lateral surface of the outer or the inner ring.

13. The rolling bearing arrangement as claimed in claim 12, wherein the circuit board is attached to the lateral surface by potting compound.

14. The rolling bearing arrangement as claimed in claim 11, wherein the outer ring is an open ring.

15. The rolling bearing arrangement as claimed in claim 1, wherein the sensor device is configured to be fastened on the rolling bearing by an adhesive film.

16. The rolling bearing arrangement as claimed in claim 15, wherein: the adhesive film comprises a first circumferential portion in a region of the inner ring and a second circumferential portion in a region of the outer ring; and the first and second portions are connected to one another by a plurality of parting webs; wherein the parting webs are configured to break when there is a force acting in a circumferential direction during initial startup.

17. The rolling bearing arrangement as claimed in claim 11, wherein the inner ring is a flinger disk.

18. The rolling bearing arrangement as claimed in claim 12, wherein the sensor device has a connection cable configured to connect to an evaluation unit, wherein the connection cable is fastened on the circuit board and is passed out of the outer ring in a region of a missing circular ring segment.

19. The rolling bearing arrangement as claimed in claim 12, wherein a power supply and sensor-electronic components are arranged on the circuit board and the elements arranged on the circuit board are connected electrically by conductor tracks.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Embodiments of the disclosure are explained in greater detail below by means of the attached figures, of which:

[0020] FIG. 1 shows a perspective view of a rolling bearing arrangement according to the disclosure; and

[0021] FIG. 2 shows an exploded view of the rolling bearing arrangement according to the disclosure.

DETAILED DESCRIPTION

[0022] FIG. 1 shows a perspective view of a rolling bearing arrangement 01 according to the disclosure, while an exploded view of the rolling bearing arrangement is shown in FIG. 2. The rolling bearing arrangement 01 comprises a rolling bearing 02 and a sensor device 03 fastened thereon. The rolling bearing 02 has at least one outer race 04, one inner race 05 and rolling elements (not shown) arranged in a rolling element space between the outer race 04 and the inner race 05. One of the two bearing races 04, 05 is rotatable relative to the other bearing race. Respective sealing rings 07 may be connected on both sides to the outer race 04, the rings extending in a radial direction between the inner race 05 and the outer race 04. The sealing ring 07 protects the interior of the rolling bearing from contaminants.

[0023] The sensor device 03 has an outer ring 08 and an inner ring 09. The diameter of the outer ring 08 may correspond to the diameter of the outer race 04 of the rolling bearing 02, with the result that the outer ring 08 and the outer race 04 at least partially overlap in cross section after assembly. The diameter of the inner ring 09 may correspond to the diameter of the inner race 05 of the rolling bearing 02, with the result that the inner ring 09 and the inner race 04 at least partially overlap in cross section after assembly. The outer and inner rings 08, 09 are designed in such a way that they can bear the required assembly forces without damage.

[0024] The outer ring 08 may be fastened on an axial end face of the outer race 04 of the rolling bearing 02. The inner ring 09 may be fastened on an axial end face of the inner race 05. To fasten a sensor device 03 on the rolling bearing 02, use may be made of an adhesive film 10 wetted on both sides with adhesive, e.g. in the form of a polyurethane foam adhesive strip with acrylate adhesive.

[0025] The adhesive film 10 may be simultaneously designed as a means of retention during transportation. For this purpose, it comprises a first circumferential portion 12 in the region of the inner ring 09 and a second circumferential portion 13 in the region of the outer ring 08. The first and second portions 12, 13 may be connected to one another by means of a plurality of parting webs 14. The parting webs 14 are designed in such a way that they break when there is a force acting in a circumferential direction and thus release the inner ring 09 with respect to the outer ring 08 and the inner race 05 with respect to the outer race 04, after which rotations are thus possible.

[0026] The outer ring 08 may be embodied as an open ring and, as a result, it can self-center during assembly. By virtue of the open C shape of the outer ring 08, it is furthermore possible to compensate manufacturing tolerances.

[0027] In the embodiment illustrated, a flexible circuit board 15 is arranged on the inner lateral surface of the outer ring 08. In modified embodiments, the circuit board can also be arranged on the outer lateral surface of the inner ring 09. In general, the circuit board 15 carries various elements 17, namely at least one sensor, the required sensor-electronic components and preferably also a power supply. Of course, it is also possible to use a plurality of sensors to detect different state variables. The elements 17 are connected electrically by conductor tracks. A connection cable 18, which can be connected to an evaluation unit (not shown), may be fastened on the circuit board 15 to enable data to be exchanged between the sensor device 03 and the evaluation unit or to supply power from an external power supply. In alternative embodiments, data exchange with the evaluation unit can also take place wirelessly by radio signal. The cable 18 can preferably be passed to the outside in the region of the missing ring segment of the outer ring 08.

[0028] The circuit board 15 may be fastened on the inner lateral surface of the outer ring 08 by means of potting compound 19. In this way, the elements 17 are protected reliably from moisture and dirt. By means of the potting compound 19, the elements 17 are furthermore also fixed in position, thereby making it possible to reliably maintain functionally important spacings between elements, in particular the sensors.

[0029] The geometry of the inner ring 09 is expediently likewise embodied so as to be self centering. A signal transmitter 20 may be arranged on the outer lateral surface of the inner ring 09. The signal transmitter 20 may be an encoder ring. Both active and passive encoders can be used. It is possible for the encoder ring 20 to be sensed optically or magnetically. After assembly, the encoder ring 20 lies radially opposite the sensor 17 attached to the circuit board 15, with the result that the sensor senses a relative rotation between the outer and the inner ring. The inner ring 09 may be embodied as a flinger disk. In this way, the signal transmitter 20 and/or the rolling element space can be protected from contaminants.

[0030] To avoid axial slippage of the rolling bearing arrangement 01, the assembled rolling bearing 02 may be fixed axially, e.g. by means of an interference fit, a retaining ring or a locknut.

LIST OF REFERENCE SIGNS

[0031] 01 rolling bearing arrangement [0032] 02 rolling bearing [0033] 03 sensor device [0034] 04 outer race [0035] 05 inner race [0036] 06 [0037] 07 sealing ring [0038] 08 outer ring [0039] 09 inner ring [0040] 10 adhesive film [0041] 11 [0042] 12 first portion of the adhesive film [0043] 13 second portion of the adhesive film [0044] 14 parting webs of the adhesive film [0045] 15 flexible circuit board [0046] 16 [0047] 17 elements/sensor [0048] 18 connection cable [0049] 19 potting compound [0050] 20 signal transmitter/encoder ring