DE102013221272A1 - Rolling bearing with integrated electric generator - Google Patents

Abstract

The present invention relates to a roller bearing (01) comprising two bearing rings (02, 03) and a between the bearing rings (02, 03) arranged cage (04) for receiving rolling elements (05) and in the rolling bearing (01) integrated electric generator (07) with a number of permanent magnets (08) and a circumferentially on one of the two bearing rings (02, 03) arranged laminated core (09) with teeth (10) which each carry a coil winding (14). The rolling bearing according to the invention is characterized in particular by the fact that for receiving the laminated core (09) serving bearing ring (02, 03) has a circumferential groove (12) for receiving the laminated core (09), that the laminated core (09) in at least two sub-packages is divided, and that the permanent magnets (08) on the cage (04) or on the other of the two bearing rings (02, 03) are arranged in the circumferential direction.

Description

Field of the invention

The present invention relates to a rolling bearing with integrated electric generator.

Background of the invention

For monitoring important process variables, such as bearing forces or temperatures, it is known to integrate sensors in bearing arrangements for mounting rotating machine parts, such as rollers. The energy supply of the integrated in the bearing assembly sensors should be designed if possible so that the bearing assembly can be changed with little effort and the operation of the sensors is permanently ensured. In this context, energy supply systems have proven to be useful, which do not require electrical supply lines for supplying electrical energy from the outside. Until now, systems which use the principle of inductive transmission or slip ring transmitters are frequently used for supplying power to the sensors integrated in the bearing arrangement. Slip ring transformers have the disadvantage that they are subject to heavy wear, especially at high speeds. With a low energy requirement there is also the possibility of battery supply. The energy supply by a battery is due to the design without recharging, however finite and therefore requires a lot of maintenance.

The DE 202 02 536 U1 describes a device for monitoring a bearing assembly in a rolling mill with at least one bearing for supporting a rotating machine part relative to a stationary housing. The storage comprises at least one sensor for detecting at least one process variable. The sensor is connected to a transmitting unit, which transmits the measured sensor data, for example via radio or induction, to a transmitter. For the energy supply of the sensor or sensor unit, an electric generator is integrated in the bearing arrangement. With the rotating machine part, a first generator element is rotatably connected, which cooperates with a second, non-rotatably connected to the housing generator element. According to a preferred embodiment, a magnetic ring and a coil are arranged in the housing on the rotating machine part. When rotating the shaft of the magnetic ring induces an electrical voltage in the coil, which is forwarded to the transmitting unit.

The DE 695 24 014 T2 shows a rolling bearing with built-in electric generator. The generator consists of a rotor, which rotates with the shaft and the inner ring, and a stator, which is attached to the outer ring. In a preferred embodiment, the inner ring is constructed of two components. The rotor in this embodiment comprises a spacer ring separating the two components of the inner ring and a series of permanent magnets circumferentially equidistant around the spacer ring. For receiving the permanent magnets, the outer surface of the spacer ring on flats, in each of which a permanent magnet, preferably via an adhesive connection, is attached. The stator attached to the outer ring has a lamellar structure with teeth and the teeth separating from each other winding slots. Each tooth carries a coil that surrounds the tooth. The rolling bearing described is preferably used in a railway carriage for charging a battery, which feeds actuators for the rail car brakes.

Summary of the invention

The object of the present invention is to provide a rolling bearing with an integrated electric generator available, the generator is characterized by a simple design and can be installed with little effort in the rolling bearing.

To solve this problem is a rolling bearing according to the appended claim 1.

The rolling bearing according to the invention comprises two bearing rings, a cage arranged between the bearing rings for receiving rolling elements and an electric generator integrated in the rolling bearing. The generator has at least one row of permanent magnets and arranged in the circumferential direction on one of the two bearing rings laminated core with teeth, each carrying a coil winding. The serving for receiving the laminated core bearing ring has a circumferential groove for receiving the laminated core. The laminated core is divided into at least two subpackets. The permanent magnets are arranged on the cage or on the other of the two bearing rings in the circumferential direction.

A significant advantage of the rolling bearing according to the invention is the fact that the integrated generator is characterized by a simple design. The number of components of the generator is limited to the essentials. The use of a circumferential groove in the bearing ring allows a low-cost attachment of the laminated core in the bearing ring. The division of the laminated core into at least two sub-packages facilitates the assembly of the laminated core. The rolling bearing according to the invention can be used for the storage of a roller, for example a roller in a machine for steel production. In such rolls, for example, the pressure load is determined by means of a sensor. With the help of In the rolling bearing built-in electric generator, the sensor can be continuously supplied with the required energy.

The laminated core is preferably designed in Schenkelpolausführung. The magnetic return of the laminated core is provided by the laminated core itself. The magnetic conclusion of the permanent magnets is taken over by the corresponding bearing component (bearing ring, cage), which is made of a magnetically conductive material.

According to an advantageous embodiment, the laminated core is divided into two laminated core halves. The laminated core halves are arranged offset in the groove by one Polteilungsfaktor each other.

In an alternative embodiment, the laminated core is in turn divided into two laminated core halves. In this embodiment, the joints of the sheets of laminated core halves are designed as a half tooth. The plates in the groove of the laminated core halves are preferably connected to one another at their joints. In the simplest case, the joints can be connected to each other via the wound around the split teeth coil winding. However, it can also be used additional connecting means, such as spring clips, which hold the sheets together at the joints.

Another preferred embodiment uses a laminated core, which consists of a series of sub-packages, each sub-package comprising a tooth. Each subpackage is fastened individually to a return ring arranged in the groove, which can be done for example by means of a captive screw connection or press connection.

The return ring is preferably designed as a laminated core. The laminated core of the return ring consists of two halves. The two halves of the return ring can be easily inserted into the groove.

According to an advantageous embodiment, the sheets of the laminated core and / or the return ring against each other are secured against rotation. This rotation can be done by the coil windings. In addition, the inner sheets of laminated core and return ring can be secured by a locking against twisting. The two outer panels are usually made without latching to facilitate assembly.

Furthermore, it has proven to be expedient if laminated core or return ring and the groove bearing ring bearing are secured against rotation against each other.

According to an advantageous embodiment, the coil windings of the individual teeth are connected in series. As a result, a high output voltage can be achieved at low speeds.

Brief description of the drawings

Preferred embodiments of the invention will be explained in more detail with reference to FIGS. Show it:

1 a longitudinal sectional view of a rolling bearing according to the invention in a first embodiment;

2 a detail Z out 1 ;

3 a cross-sectional view of the rolling bearing according to the invention along a section line BB in 1 ;

4 a detail Y out 3 ;

5 a cross-sectional view of the rolling bearing according to the invention in a second embodiment;

6 a detail B off 5 ;

7 a longitudinal sectional view of the rolling bearing according to the invention along a section line AA in 5 ;

8th a detail A off 7 ;

9 a longitudinal sectional view of the rolling bearing according to the invention along a section line CC in 5 ;

10 a detail C off 9 ;

11 a cross-sectional view of the rolling bearing according to the invention in a third embodiment;

12 a detail X out 11 ;

13 a longitudinal sectional view of the rolling bearing according to the invention along a section line AA in 11 ;

14 a detail Y out 13 ;

15 a longitudinal sectional view of the rolling bearing according to the invention along a section line CC in 11 ;

16 a detail Z out 15 ,

Detailed description of the drawings

The 1 and 3 show sectional views of a rolling bearing according to the invention 01 in a first embodiment. The rolling bearing 01 includes an inner ring 02 , an outer ring 03 a cage 04 and rolling elements 05 which by means of cage 04 be kept at the same distance. The rolling bearing shown 01 is a double row rolling bearing 01 executed. Of course, single-row bearings are possible. In the rolling bearing 01 is an electric generator 07 integrated.

The construction of the electric generator 07 is described below on the basis of 2 and 4 explained in more detail, the detailed views of the bearing 01 demonstrate. The electric generator 07 includes a series of permanent magnets 08 , which on the cage 04 are arranged and fixed there in a suitable manner, for example via an adhesive connection. The magnetic inference of the permanent magnets 08 is through the magnetically conductive cage 04 Furthermore, the electric generator includes 07 a laminated core 09 with a row of teeth 10 , which in one, in the inner ring 02 introduced circumferential groove 12 is arranged. The magnetic conclusion of the laminated core 09 is provided by the laminated core itself. The laminated core 09 is executed in salient pole execution. It is divided into two laminated halves. The two laminated core halves are in the groove 12 arranged offset by a respective Polteilungsfaktor each other. The individual sheets 13 of the laminated core 09 are torsionally sheet-packed and electrically isolated from each other. The winding of the teeth 10 with coil windings 14 Can be realized by a needle winder. The coil windings 14 the teeth 10 can be connected in series to achieve high output voltages at low speeds. These are single-phase or three-phase coil windings 14 possible. A 3-phase coil winding 14 can be switched in the star and in the triangle. The coil winding 14 supporting coil carrier is preferably made of two half-shells made of plastic, such as PA 66, and is by a snap connection to the respective tooth 10 positioned. Through the coil windings 14 become the sheets 13 secured against twisting against each other. The inner sheets 13 can be additionally secured by a lock against twisting each other. The two outer sheets 13 are designed for easier installation without latching. The twisting between laminated core 09 and inner ring 02 can be prevented by a radial or axial dowel pin.

The 5 . 7 and 9 show sectional views of the rolling bearing according to the invention 01 in a second embodiment. The 6 . 8th and 10 show detailed views of this embodiment. In this embodiment, the laminated core 09 again divided into two laminated core halves. The sheets located on one level 13 the laminated core halves are arranged individually or in block on the circumference each butt to each other. The joints 15 the sheets 13 the laminated core halves are in the embodiment shown as a half tooth 10 formed (see 6 ). The laminated core halves are in turn in the circumferential groove 12 of the inner ring 02 inserted. Through the coil windings 14 become the sheets 13 secured against twisting against each other. In addition, here also the inner plates 13 be secured by a lock against twisting. By spring clip 17 (please refer 6 . 10 ) can the joints 15 the sheets 13 held together. However, as a backup, the coil winding 14 serve, which around the split teeth 10 is wound.

The 11 . 13 and 15 show sectional views of the rolling bearing according to the invention 01 in a third embodiment. The 12 . 14 and 16 show detailed views of this embodiment. In contrast to the two embodiments described above, in the embodiment shown here, the laminated core 09 from a series of subpackages. Each subpackage includes a tooth 10 with a coil winding 14 , The partial packages are each about a captive first screw 18 on a return ring 19 attached. The return ring 19 is designed as a laminated core. The laminated core of the return ring 19 consists of two halves. The halves of the return ring 19 be in the circumferential groove 12 of the inner ring 02 inserted and by a captive second screw 20 secured. Through the coil windings 14 become the sheets 13 of the laminated core 09 secured against twisting against each other. In addition, the inner plates of the return ring 19 be secured by a lock against twisting. The two outer plates of the return ring 19 are designed for easier installation without latching. The twisting between return ring 19 and inner ring 02 can through the captive second screw 20 be prevented. A change in length due to heat input is taken into account accordingly.

In all embodiments, the electric generator 07 bound to a single diameter. An individual adaptation to different types of bearings is possible, but requires a circumferential adjustment of the electrical generator 07 , The laminated core 09 can be varied in width depending on the sheet thickness. In this way, it is possible to directly influence the available winding space and the magnetic flux guidance, and thus the efficiency of the electric generator 07 be determined. Specific to the bearing, the magnetic circuit must be adapted accordingly.

LIST OF REFERENCE NUMBERS

01

roller bearing

02

inner ring

03

outer ring

04

Cage

05

rolling elements

06

07

electric generator

08

permanent magnets

09

laminated core

10

teeth

11

12

groove

13

sheets

14

coil windings

15

joints

16

17

spring clip

18

captive first screw

19

Return ring

20

captive second screw

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 20202536 U1 [0003]
• DE 69524014 T2 [0004]

Claims (10)

Roller bearing ( 01 ) comprising two bearing rings ( 02 . 03 ), one between the bearing rings ( 02 . 03 ) arranged cage ( 04 ) for receiving rolling elements ( 05 ) and one in the rolling bearing ( 01 ) integrated electric generator ( 07 ) with a series of permanent magnets ( 08 ) and one in the circumferential direction on one of the two bearing rings ( 02 . 03 ) arranged laminated core ( 09 ) with teeth ( 10 ), each having a coil winding ( 14 ) bear, characterized in that the for receiving the laminated core ( 09 ) bearing ring ( 02 . 03 ) a circumferential groove ( 12 ) for receiving the laminated core ( 09 ), that the laminated core ( 09 ) is divided into at least two sub-packages, and that the permanent magnets ( 08 ) on the cage ( 04 ) or at the other of the two bearing rings ( 02 . 03 ) are arranged in the circumferential direction. Roller bearing ( 01 ) according to claim 1, characterized in that the laminated core ( 09 ) are executed in salient pole execution. Roller bearing ( 01 ) according to claim 1 or 2, characterized in that the laminated core ( 09 ) is divided into two laminated core halves, and that the laminated core halves in the circumferential groove ( 12 ) are arranged offset by one Polteilungsfaktor each other. Roller bearing ( 01 ) according to claim 1 or 2, characterized in that the laminated core ( 09 ) is divided into two laminated core halves, and that the joints ( 15 ) of the sheets of laminated core halves as a half tooth ( 10 ) are executed. Roller bearing ( 01 ) according to claim 4, characterized in that the sheets ( 13 ) of the laminated core halves at their joints ( 15 ) are interconnected. Roller bearing ( 01 ) according to claim 1 or 2, characterized in that the laminated core ( 09 ) has a series of sub-packages, each sub-package comprising a tooth ( 10 ), and that each subpacket individually on one in the circumferential groove ( 12 ) arranged return ring ( 19 ) is attached. Roller bearing ( 01 ) according to claim 6, characterized in that the return ring ( 19 ) is designed as a laminated core, and that the laminated core of the return ring ( 19 ) consists of two halves. Roller bearing ( 01 ) according to one of claims 1 to 7, characterized in that the sheets ( 13 ) of the laminated core ( 09 ) and / or the return ring ( 19 ) are secured against each other against twisting. Roller bearing ( 01 ) according to one of claims 1 to 8, characterized in that laminated core ( 09 ) or return ring ( 19 ) and the groove ( 12 ) bearing ring ( 02 . 03 ) are secured against each other against twisting. Roller bearing ( 01 ) according to one of claims 1 to 9, characterized in that the coil windings ( 14 ) the teeth ( 10 ) are connected in series.

Images