WO2015035988A1

WO2015035988A1 - Rolling bearing with an energy production unit

Info

Publication number: WO2015035988A1
Application number: PCT/DE2014/200349
Authority: WO
Inventors: Rainer Schröder
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2013-09-11
Filing date: 2014-07-25
Publication date: 2015-03-19
Also published as: DE102013218184A1

Abstract

The invention relates to a rolling bearing (1) comprising an inner ring (2), an outer ring (3), a bearing cage (5), said bearing cage (5) comprising axially aligned webs and at least one annular cage edge (5a, 5b), said webs forming pockets to receive rolling bearings (4), and permanent magnets (11a, 11b) which interact with an induction coil (8a, 8b). Said claimed rolling bearing (1) is characterised in that the permanent magnets (11a, 11b) are arranged on an axial end of the bearing cage (5).

Description

Name of the invention

Rolling bearings with power generation unit Description

Field of the invention

The invention relates to a rolling bearing with an energy generating unit and a bearing assembly for rotatably supporting a roller, in particular a guide roller for paper webs.

Background of the Invention The rotational movement of a rolling bearing can generate electrical energy during operation. For this purpose, a power generation unit can be structurally integrated into the rolling bearing. Such a power generation unit 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 a power generation unit, for example rolling bearings with a claw pole generator, are required by the practice to provide a constant and sufficiently high voltage while maintaining the standard dimensions of the rolling bearing and enabling a simple voltage decrease. In the case of swing-out rolling bearings, it is additionally demanded by the practice that the swing-out capability should not be significantly restricted by the integration of the energy-generating unit. DE 10 201 1 075 547 A1 describes a designed as a particular double-row spherical roller bearings rolling bearing with a bearing ring, a bearing cage for receiving at least one rolling element, designed as a particular Klauenpolgenerator power generation unit with permanent magnets, wherein the magnets are integrated into a cage groove in the middle guide ring of the bearing cage and the With the two claw rings surrounded induction coil is arranged opposite the middle guide ring.

Especially in double-row spherical roller bearings, the integration of the permanent magnets in the middle guide ring of a standard bearing cage and the arrangement of the claw rings surrounded induction coil in the space between the two tracks is connected with complex assembly work. Furthermore, the amount of energy that can be generated is limited by an internal power generation unit, since an increase of the induction coil and / or the magnetic poles in the inner space of a roller bearing leads to shielding problems with the current flow.

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 energy generating unit, which enables a simple and cost-effective production of rolling bearings and an improvement in the provision of energy includes. The standard dimensions and / or only slightly adapted standard rolling bearing components should be usable.

The object is achieved according to claim 1, characterized in that permanent magnets are arranged at one axial end of the bearing cage.

Due to the relative movement of the bearing cage 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, energy can be generated. The arrangement of the permanent magnets at one axial end of the bearing cage and the corresponding arrangement of the claw rings with the induction coil at the same axial end of the inner ring or the shaft, allows easy mounting of the power generation unit. Furthermore, the arrangement of the induction coil at one axial end of the rolling bearing allows a simple electrical supply to the induction coil. This direct lateral voltage decrease to supply other electronic components therefore requires no further elaborate adjustments to the standard rolling bearings, such as holes for the installation of electrical lines seen from the interior of the bearing. Such a disadvantageous bore is described, for example, in DE 10 201 1075547 A1.

Another advantage of disposing the permanent magnets and the induction coil at one axial end of the rolling bearing is that, in comparison with a structure of the invention, the magnetic poles and / or the induction coil can be made larger to increase energy production. For example, in the case of double-row rolling bearings with a design close to the layer, the permanent magnets must be shielded against two rows of rolling elements running in the circumferential direction, and the permanent magnets are therefore limited in size dimensioning in this embodiment. In one embodiment of the invention, the Pernnanentnnagnete are arranged distributed on a magnetically conductive support ring over the circumference. Such a conductive carrier ring ensures the magnetic inference between unlike magnetic poles. This allows, for example, the integration of a Klauenpolgenerators in such bearings whose bearing cages are made of a magnetically not or only poorly conductive material. Furthermore, the arrangement of the permanent magnets on a support ring enables a simple and cost-effective attachment of magnetic poles for generating electricity to a bearing cage of a rolling bearing; a complex integration of the magnetic poles in the bearing cage itself is eliminated. In addition, the mounting of the carrier ring at one axial end of the bearing cage by the lateral outboard bearing access easier and cheaper than an internal bearing construction. In one embodiment of the invention, the carrier ring is arranged on the cage board. The arrangement of the carrier ring on the side cage board can, for example, coaxial friction, material or form-fitting done, such as by pressing, gluing or mounting. In a further embodiment of the invention, the cage board forms the carrier ring. Thus, for example, in the case of a multi-part bearing cage, that is to say in the case of a bearing cage in which a cage board is placed laterally on the axially directed webs, the carrier ring assumes the function of the lateral cage board for guiding the rolling elements and furthermore fulfills the function of the carrier medium for the permanent magnets. A placement of the carrier ring on the axially directed webs can again coaxial friction, fabric or form-fitting. Usual, for example, a screw or riveting.

In other words, a frictional, positive or cohesive mounting of the carrier ring on a cage board, or the alternative embodiment in which the cage board forms the carrier ring, allows a simple and cost-effective production of a rolling bearing with power generation unit. For example, carrier rings with permanent magnets can be detached from the other rolling elements. be manufactured component components and then, with little installation effort laterally attached to the bearing cage. This also makes it possible, in particular, to use standard storage cages with only a slight adaptation of the dimensions and production processes. Both solid bearing cages and multi-part bearing cages can be used. Another advantage is the maintenance of the standard dimensions of rolling bearings, for example, standard outer rings can be used, so that the mounting of the bearing cage in the warehouse is easy. In one embodiment of the invention, the induction coil is arranged along an annular shoulder formed in the circumferential direction of the inner ring (coaxial with the bearing cage). In this case, the induction coil in the annular shoulder can be arranged such that the adjacent raceway surface and / or the final axial end of the inner ring is flush. Therefore, for the inner ring of the bearing only small changes in the design dimensions, and thus also the standard dimensions of rolling bearings can be maintained for this purpose. Another advantage is the space-saving integration of the induction coil in the rolling bearing. For rolling bearings without inner ring, the shaft can take over a corresponding function for the arrangement of the induction coil.

In one embodiment of the invention, both axial ends of the bearing cage each have an induction coil and a plurality of permanent magnets. Through the use of two induction coils, the induction voltage can be increased. In particular, compared to double-row bearings with a single inner bearing power generation unit, this has advantages, as can be provided consistently over 5 watts.

In one embodiment of the invention, the rolling bearing is designed as a barrel roller bearing or as a spherical roller bearing. Both single-row barrel roller bearings and double-row spherical roller bearings can be designed as swing-out roller bearings. For swing-out roller bearings, the shaft with mounted inner ring, rolling elements and bearing cage with respect to the outer ring be pivoted, with the shaft / inner ring and the bearing cage keep a constant distance. Thus, the air gap between an induction coil and the permanent magnet is determined by the geometry of the bearing cage and remains the same. This allows a constant supply / output of induction voltage.

In one embodiment of the invention rolling bearings are provided for rotatably supporting a roller. For example, spherical roller bearings are used for the rotatable mounting of large-building rollers. One 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 acted upon energetically by the power generation unit of the rolling bearing. Brief description of the drawings

Hereinafter, an embodiment of the invention will be illustrated with reference to two figures. In the drawings: FIG. 1 shows an axial partial section of a rolling bearing according to the invention according to an embodiment,

FIG. FIG. 2 is a sectional view of the bearing cage of FIG. 1 .

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 7. Thus, the rolling bearing 1 can rotate about the rotation axis 6. Rolling bearing 1 further comprises a bearing cage 5 consisting of axially directed webs 14 (see Fig. 2), two lateral cage rims 5a, 5b and a middle cage board 5c (see Fig. 2). From the bearing cage 5 so pockets for receiving rolling elements 4 are formed and thus the rolling elements 4 out and kept at a distance.

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 coils 8a, 8b surrounded by claw rings 9a, 9b and the opposing permanent magnets 11a, 11b. Depending on a plurality of permanent magnets 1 1 a, 1 1 b and the respective opposite of claw rings 9a, 9b surrounded induction coil 8a, 8b form an air gap 12a, 12b. According to the invention, the permanent magnets 1 1 a, 1 1 b arranged at one axial end of the bearing cage. Consequently, the induction coil 8a, 8b surrounded by claw rings 9a, 9b is also arranged at the respectively same axial end. This arrangement at the axial ends of the rolling bearing 1 allows an advantageous lateral access in the assembly of the corresponding components of the claw pole generator. Furthermore, a decrease in the generated stress is easier than compared to an internal bearing construction.

Furthermore, FIG. 1, the permanent magnets 11a, 11b are arranged distributed over the circumference on a magnetically conductive carrier ring 10a, 10b. The carrier ring 10a, 10b on the one hand has the function of ensuring the magnetic inference between unlike magnetic poles. On the other hand, the carrier ring 10a, 10b with the permanent magnets 11a, 11b can be completely manufactured or preassembled, before it can then advantageously be arranged on the bearing cage 5 from the outside. This allows, for example, a simple and cost-saving production step in the production of rolling bearings according to the invention. An arrangement of the carrier ring 10a, 10b on the cage board 5a, 5b can take place here in different embodiments.

For example, FIG. 2 in a sectional perspective view of the support ring 10a, 10b axially form-, friction or cohesive on Käfigbord 5a, 5b of the bearing cage 5 according to the invention. This arrangement is advantageous in solid storage cages in which the cage rims 5a, 5b are part of the bearing cage. Thus, a magnetically non-conductive brass solid bearing cage could be used for insulation and an arranged carrier ring to ensure the magnetic return.

In another example (not graphically illustrated), the cage shelf may form the carrier ring. In this example, the carrier ring receives an additional guide function of the cage shelf. This other example is advantageous, for example, in multi-part bearing cages. Thus, the webs and possibly middle Käfigborde could consist of magnetically non-conductive material and the support ring are axially arranged for example by screwing, riveting or clicking on the webs and be made of steel, for example. Here, therefore, a part of the cage serves for isolation, whereby the carrier ring ensures the magnetic inference function.

Back to FIG. 1, this shows the induction coil 8a, 8b arranged along an in the circumferential direction of the inner ring (coaxial with the bearing cage) annular shoulder 13a, 13b. The induction coil 8a, 8b surrounded by claw rings 9a, 9b can in this case terminate flush with the adjacent raceway surface (not illustrated in FIG. 1) and / or the terminating axial end of the inner ring 2 (illustrated in FIG. This also allows the advantageous space utilization of the rolling bearing. 1 Not in FIG. 1, but also encompassed by the inventive concept are roller bearings with only one side cage board, for example, an axial end of the bearing cage of the bearing remain open for ease of lubrication or other reasons. In this case, the claw Polgenerator only at one axial end a unit consisting of a plurality of permanent magnets and an inductive coil surrounded by claw rings. Not in FIGs. 1 and 2, but also included in the concept of the invention are roller bearings and the associated bearing cages with any number of rows for receiving rolling elements. An example of a single-row roller bearing is the barrel roller bearing. In the description of FIGs. 1 and 2 is spoken by a Klauenpolgenerator with at least one unit, but also possible two units consisting of a plurality of permanent magnets and induction coil. It is understood that, according to the invention, a separate claw-pole generator, each having a unit consisting of a plurality of permanent magnets and an induction coil, can also be present at each axial end.

The rolling bearing according to the invention can also be advantageously used as a bearing assembly for rotatably supporting a roller. In this case, the roller can be, for example, a guide roller for paper webs.

Rolling stock

inner ring

outer ring

rolling elements

bearing cage

a lateral cage board

b side cage shelf

c middle cage board

axis of rotation

wave

a induction coil

b induction coil

a claw rings

b Claw rings

0a carrier ring

0b carrier ring

1 a permanent magnets

1 b permanent magnets

2a air gap

2b air gap

3a ring shoulder

3b ring shoulder

4 footbridge

Claims

claims

1 . Rolling bearing (1), comprising:

an inner ring (2),

an outer ring (3),

a bearing cage (5), wherein the bearing cage (5) axially directed webs (14) and at least one annular Käfigbord (5a, 5b), wherein the webs (14) pockets for receiving rolling elements (4) form, and

Permanent magnets (11a, 11b) which interact with an induction coil (8a, 8b),

characterized,

in that the permanent magnets (11a, 11b) are arranged at one axial end of the bearing cage (5).

2. Rolling bearing (1) according to claim 1, wherein the permanent magnets (1 1 a, 1 1 b) on a magnetically conductive carrier ring (10 a, 10 b) are distributed over the circumference.

3. rolling bearing (1) according to claim 2, wherein the support ring (10 a, 10 b) on the cage board (5 a, 5 b) is arranged.

4. Rolling bearing (1) according to claim 2, wherein the cage board (5a, 5b) forms the carrier ring (10a, 10b).

5. Rolling bearing (1) according to one of claims 1 to 4, wherein the induction coil (8a, 8b) along an in the circumferential direction of the inner ring (2) formed annular shoulder (13a, 13b) is arranged.

6. Rolling bearing (1) according to one of claims 1 to 5, wherein both axial ends of the bearing cage (5) each have an induction coil (8a, 8b) and a plurality of permanent magnets (1 1 a, 1 1 b).

7. Rolling bearing (1) according to one of claims 1 to 6, wherein the rolling bearing (1) is designed as a barrel roller bearing.

8. Rolling bearing (1) according to one of claims 1 to 6, wherein the Wälzla- ger (1) is designed as a spherical roller bearing.

9. Bearing arrangement for the rotatable mounting of a roller with a rolling bearing (1) according to one of claims 1 to 8.

10. Bearing arrangement according to claim 9, wherein the roller is a guide roller for paper webs.