WO2015058747A1

WO2015058747A1 - Rolling bearing with electric generator

Info

Publication number: WO2015058747A1
Application number: PCT/DE2014/200391
Authority: WO
Inventors: Rainer Schröder; Gerhard Schneider
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2013-10-21
Filing date: 2014-08-07
Publication date: 2015-04-30
Also published as: DE102013221269A1

Abstract

The invention relates to a rolling bearing (1) comprising an inner race (2), an outer race (3), a bearing cage for receiving at least one row of rolling elements (5a, 5b), and permanent magnets (6) which interact with an induction coil (7). The rolling bearing (1) according to the invention is characterised in that the induction coil (7) is on the inner race (2) and the permanent magnets (6) are on the outer race (3).

Description

Name of the invention

Rolling bearings with electric generator Description

Field of the invention

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

Background of the invention

The rotational movement of a rolling bearing can generate electrical energy during operation. For this purpose, an electric generator can be structurally integrated into the rolling bearing. Such an electric generator can be designed, for example, as a claw pole generator, in which permanent magnets interact with an induction coil. In a claw pole generator, two claw rings surround an induction coil that orbits the axis of rotation of the roller bearing, the two claw rings being circumferentially offset from each other. The two claw rings and the induction coil can for example be attached to a bearing ring. When a first claw of the first claw ring opposes a first pole, for example a north pole, a magnetic circle is connected via a circumferentially adjacent second claw, namely a claw of the second claw ring to a circumferentially adjacent second, unlike, magnetic pole this case a south pole, formed. If the bearing ring continues to rotate with the two claw rings, the second claw faces the north pole and the first claw a south pole, so that the direction of the magnetic circuit surrounding the induction coil reverses and a magnetic voltage is generated in the induction coil. This voltage can be removed for example via a supplied cable to the induction coil. Rolling bearings with an electric generator, for example rolling bearings with a claw-pole generator, are required by the practice to provide a constant and sufficiently large voltage, while maintaining the standard dimensions of the rolling bearing and a simple Spannungsab- to allow. In the case of swing-out roller bearings, it is additionally demanded by the practice that the swing-out capability should not be significantly restricted by the integration of the electric generator. DE 10 201 1075547 A1 A1 describes a designed as a particular double-row spherical roller bearings with a bearing ring, a bearing cage for receiving at least one rolling element and designed as a particular claw pole generator electric generator with permanent magnets, wherein the magnets integrated into a cage groove in the middle guide ring of the bearing cage and the induction coil surrounded by the two claw rings is arranged opposite the middle guide ring.

In rolling bearings with an electric generator, in particular with an induction coil and permanent magnets, the available space determines the dimensions of the electric generator. The size and number of permanent magnets and the induction coil and thus the energy that can be generated are therefore limited. The electric generator in a rolling bearing as described in DE 10201 1 075 547 A1 can produce about 5 watts at about 200 revolutions per minute, for example. Thus only simple energy consumers, for example a single piezoelectric pressure sensor for a roller for paper webs, can be supplied.

Summary of the invention

The object of the invention is therefore, starting from a rolling bearing with a claw pole generator, to specify a rolling bearing construction with an electric generator which enables a higher energy production while maintaining the standard dimensions and / or only slightly adapted standard rolling bearing components. The object is achieved according to claim 1, characterized in that an induction coil is arranged on the inner ring and the permanent magnets are arranged on the outer ring. Due to the relative movement of the outer ring, on which the permanent magnets are arranged, and the inner ring or the shaft, on which the claw rings are arranged with the induction coil, can generate energy. The relative movement of outer ring and inner ring is about 50 percent higher than the relative movement of the bearing cage and inner ring, as described for example in DE 10 201 1 075 547 A1. This higher speed difference allows you to generate more energy.

If the maximum producible energy is not required, alternatively the dimension of the coil and / or of the permanent magnets can advantageously be reduced. This takes up less space and also a shield against, for example, extending in the circumferential direction rolling elements is facilitated. An advantageous reduction of the number of permanent magnets is possible.

Furthermore, due to the higher relative movement of the outer ring and the inner ring and the associated smaller dimensions of an electric generator, these can also be integrated into those rolling bearings which do not have sufficient space for a solution according to the prior art.

In one embodiment of the invention, the permanent magnets are connected to one another via a magnetically conductive ring, for example made of steel. Such a conductive ring ensures the magnetic inference between unlike magnetic poles.

In a further embodiment of the invention, the permanent magnets are arranged distributed on an annular holder over its circumference. Here, the annular holder is connected to the outer ring in the circumferential direction against rotation.

In a further embodiment of the invention, the annular holder is not magnetically conductive, for example made of brass. The fact that the annular holder is not magnetically conductive is the magnetic Conclusion better ensured. The annular holder thus has an insulating function for the magnetic yoke, in particular against a magnetically conductive outer ring and / or cage with recorded rolling elements.

The arrangement of the permanent magnets can be made on the annular holder, while the magnetically conductive ring ensures the magnetic return. Alternatively, the permanent magnets may be disposed on the magnetically conductive ring, and the magnetically conductive ring is disposed on the annular holder. Thus, the magnetically conductive ring has the further function of the carrier of the permanent magnets. In the manufacture of the rolling bearing of the magnetically conductive ring can be advantageously prepared in advance with the permanent magnet and then simply be placed on the annular holder.

In a further embodiment of the invention, two rows of rolling elements are provided. Here, the bearing cage between the at least two rows of rolling elements in the circumferential direction is divided into at least two cage halves and the annular holder extends between these cage halves. The annular holder, which is arranged on the outer ring, thus advantageously passes between the cage halves the slower in operation rotating cage and arranges the permanent magnets of the induction coil opposite to the generation of induction energy. Furthermore, the annular holder assumes a guiding function for the cage halves.

In a further embodiment of the invention, a Verdrehsicherungse- element is received in an outer ring recess. The anti-rotation element thus fixes the annular holder against rotation in the circumferential direction.

In a further embodiment of the invention, the annular holder and the anti-rotation element are designed such that the outer ring is tilted relative to the annular holder or to the main axis of the roller bearing. bar is. Tilting to the main axis of the rolling bearing can be achieved, for example, that the anti-rotation element is accommodated without Hauptachsenspiel in the outer ring recess, wherein the annular holder allows a game in the direction of the main axis of the rolling bearing. Alternatively, the rotation without Hauptachsenspiel can be firmly connected to the annular holder, wherein the outer ring allows a Hauptachsenspiel by means of, for example, extending in the main axis of the rolling bearing groove. The main-axis clearance advantageously allows the distance between the permanent magnets and the induction coil to remain constant when tilting from the outer ring relative to the inner ring or the annular holder.

In particular, embodiments of the invention can be used with an anti-rotation element in rolling bearings with one-piece outer ring. A positive clamping of the annular holder between two outer ring halves is not necessary, for example.

In a further embodiment of the invention, the outer ring is multi-part and comprises at least two outer ring halves and the annular holder is clamped form-fitting between the outer ring halves.

In a further embodiment of the invention, the rolling bearing is designed as a spherical roller bearing. Such spherical roller bearings are used for example for the rotatable mounting of large-building rollers. A possible bearing arrangement is the rotatable mounting of the roller as a guide roller for paper webs, wherein a pressure sensor on the lateral surface of the guide roller can be energetically acted upon by the electric generator of the rolling bearing.

In further embodiments of the invention, multi-row rolling bearings between each row of rolling elements may have integrated an electric generator according to the invention. Brief description of the drawings

Hereinafter, an embodiment of the invention will be illustrated with reference to figures. Show it:

FIG. 1 shows an axial partial section of a rolling bearing according to the invention according to an embodiment,

FIG. FIG. 2 is a schematic longitudinal section of the embodiment shown in FIG. 1 illustrated inventive rolling bearing,

FIG. 3 shows an axial partial section of a rolling bearing according to the invention according to a further embodiment. Detailed description of the drawings

FIG. 1 shows the partial axial section of a roller bearing 1, which is designed as a double-row spherical roller bearing, and comprises an inner ring 2 and an outer ring 3. The inner ring 2 of the rolling bearing 1 is mounted on the shaft 12. Thus, the rolling bearing 1 can rotate about the axis of rotation 13. Rolling bearing 1 further comprises a bearing cage consisting of two cage halves 4a, 4b, each cage half 4a, 4b pockets for receiving rolling elements 5a, 5b and the rolling elements 5a, 5b spaced so feasible are. Furthermore, FIG. 1 is a schematic representation of components of a claw pole generator for power generation. The illustrated components of the claw pole generator comprise the induction coil 7 surrounded by claw rings (not illustrated in FIG. 1) and the opposing permanent magnets 6. Between the permanent magnets 6 and the induction coil 7 surrounded by claw rings is an air gap 14.

According to the invention, the permanent magnets 6 on a non-magnetically conductive annular holder 9 by means of a magnetically conductive ring. 8 arranged. The annular holder 9 extends from the outer ring 3 between the two cage halves 4a, 4b. Further, the outer ring 3 has at least one outer ring recess 1 1 for receiving a Verdrehsicherungselements 10, which is positively received in the outer ring recess 1 1 and protrudes from the raceway of the outer ring 3. The anti-rotation element 10 can be designed, for example, as a pin or threaded pin.

The part of the anti-rotation element 10 projecting beyond the raceway is accommodated in a groove of the annular holder 9 that is positive in the circumferential direction, the groove having a play 15a, 15b in the main axis direction of the rolling bearing 1. By receiving the connected to the outer ring 3 anti-rotation element 10 in the groove of the annular holder 9 of the annular holder is secured against rotation in the circumferential direction and fixed to the outer ring 3. The game 15a, 15b allows tilting of the outer ring 3 with respect to shaft 12 or the inner ring 2 with rolling elements 5a, 5b, annular holder 9, permanent magnets 6, cage halves 4a, 4b and induction coil 7. Here, the air gap 14 between the permanent magnets 6 and induction coil 7 advantageously an approximately constant distance. Thus, a constant energy value can be generated by the claw pole generator.

It is understood that, according to the invention, securing of the annular holder 9 against rotation in the circumferential direction can also be achieved by two or more anti-rotation elements 10.

In the case of rolling bearings which are not tiltable and / or permit / require only slight tilting (not illustrated in FIG. 1), the play can be dispensed with and the anti-rotation element can be positively connected to the annular holder.

Alternatively or additionally (not illustrated in FIG. 1), the play can also be formed via a groove parallel to the main axis in the outer ring. FIG. FIG. 2 shows a schematic longitudinal section of the embodiment shown in FIG. 1 illustrated inventions rolling bearing. 1 It shows the inner ring 2, the induction coil 7 of a claw pole generator (claw rings not shown), the magnetically conductive ring 8 with arranged permanent magnets 6, which form an air gap 14 with the induction coil 7, the annular holder 9, which in the circumferential direction against rotation by means of an anti-rotation element 10th is fixed in the outer ring recess 1 1 of the outer ring 3. In longitudinal section of FIG. 2 it can be seen that the anti-rotation element 10 is connected in a form-fitting manner in the circumferential direction with the annular holder 9, and thus has a clearance only in the main axis direction (see FIG. 1).

FIG. 3 shows an axial partial section of a rolling bearing 1 according to the invention according to a further embodiment. The rolling bearing in FIG. 2 differs from the rolling bearing in FIG. 1 in particular in the construction of the outer ring and the fixation of the annular holder 9 in the circumferential direction. Namely, the outer ring is divided into two outer ring halves 3a, 3b. The annular holder 9 extends between the outer ring halves 3 a, 3 b and is therefore also positively clamped and is fixed against rotation in the circumferential direction. This arrangement is especially advantageous for non-tiltable rolling bearings or only slightly tiltable bearings in which the air gap 14 does not change or only slightly, advantageous because the installation of a Verdrehsicherungsstift (see in Fig. 1 anti-rotation pin 10 and outer ring recess 1 1) not is required and the production and assembly is even easier and less expensive.

LIST OF REFERENCE NUMBERS

1 rolling bearing

2 inner ring

3 outer ring

3a outer ring half

3b outer ring half

4a cage half

4b cage half

5a rolling elements

5b rolling elements

6 permanent magnets

7 induction coil

8 Magnetically conductive ring

9 Ring-shaped holder

10 anti-rotation element outer ring recess

12 wave

13 axis of rotation

14 air gap

15a game

15b game

Claims

claims

1 . Rolling bearing (1), comprising:

an inner ring (2),

an outer ring (3),

a bearing cage for receiving at least one row of rolling elements (5a, 5b),

and permanent magnets (6) cooperating with an induction coil (7),

characterized,

the induction coil (7) is arranged on the inner ring (2) and the permanent magnets (6) are arranged on the outer ring (3).

2. Rolling bearing according to claim 1, wherein the permanent magnets (6) via a magnetically conductive ring (8) are interconnected.

3. Rolling bearing according to claim 1 or 2, wherein the permanent magnets (6) along an annular holder (9) are distributed over the circumference thereof, and wherein the annular holder (9) with the outer ring (3) is connected against rotation in the circumferential direction.

4. rolling bearing claim 3, wherein the annular holder (9) is not magnetically conductive.

5. Rolling bearing according to claim 3 or 4, wherein at least two rows of rolling elements (5a, 5b) are provided, wherein the bearing cage between the at least two rows of rolling elements (5a, 5b) in the circumferential direction in at least two cage halves (4a, 4b) divided and wherein the annular holder (9) extends between the cage halves (4a, 4b).

6. Rolling bearing according to one of claims 3 to 5, wherein at least one anti-rotation element (10) in an outer ring recess (1 1) received men and the anti-rotation element (10) the annular holder (9) fixed against rotation in the circumferential direction.

7. Rolling bearing according to claim 6, wherein the annular holder (9) and the anti-rotation element (10) are formed so that the outer ring (3) relative to the annular holder (9) is tiltable.

8. Rolling bearing according to claim 6 or 7, wherein the rolling bearing is designed as a floating bearing.

9. Rolling bearing according to one of claims 3 to 5, wherein the outer ring (3) comprises at least two outer ring halves and the annular holder (9) is clamped between the outer ring halves.

10. Rolling bearing according to one of claims 1 to 9, wherein the rolling bearing is designed as a spherical roller bearing.