DE102018127454A1 - Encoder for a wheel bearing and wheel bearing with such an encoder - Google Patents

Abstract

The invention relates to an encoder (2) for a wheel bearing (1), comprising a carrier plate ring (4) which is arranged on an outer ring (3a) or on an inner ring (3b) of the wheel bearing (1), the carrier plate ring (4) is encompassed at least partially over the entire circumference by a magnetic coding ring (7), and the coding ring (7) is designed to be unipolarly magnetized. The invention further relates to a wheel bearing (1) comprising such an encoder (2).

Description

The invention relates to an encoder for a wheel bearing, in particular for a roller ball bearing.

For example, the DE 10 2012 204 039 A1 a seal with an integrated encoder emerges, which is mounted between a fixed support and a rotating support of a bearing. The seal comprises a mobile frame with a disk, the magnetic encoder element being carried by the disk and being formed by an elastomer loaded with magnetic particles, which covers the outside of the disk. The magnetic encoder element carries a radial outer sealing lip which is fastened to the disk and rests on the rotating carrier and a further lip which is in contact with a conical support surface of the fixed carrier. The disc is firmly connected to a cylindrical wing that is placed on the mobile carrier. The outside of the magnetic encoder element is contained in a plane of a side face of at least one of the carriers, the magnetic encoder element being designed as a multi-pole encoder.

The object of the present invention is to propose a simple-to-produce encoder for a wheel bearing of a vehicle. This object is achieved by an encoder with the features of claim 1. Preferred or advantageous embodiments of the invention result from the subclaims, the following description and the attached figures.

An encoder according to the invention for a wheel bearing comprises a carrier plate ring which is arranged on an outer ring or on an inner ring of the wheel bearing, the carrier plate ring being at least partially surrounded over the entire circumference by a magnetic coding ring, the coding ring being designed to be unipolarly magnetized. In other words, the carrier sheet metal ring is at least partially enveloped or extrusion-coated with the material of the magnetic coding ring. The coding ring is preferably adhered to the carrier plate ring by means of a chemical adhesive system, for example by means of vulcanization. In other words, the coding ring is at least partially integrally connected to the carrier sheet metal ring.

According to a preferred exemplary embodiment, the carrier sheet metal ring is L-shaped and made of a metal and has a first and a second leg, the first leg running essentially radially and the second leg running essentially axially. The two legs are therefore arranged relative to one another such that an essentially right angle is formed between the legs. The carrier plate ring is also preferably ferromagnetic.

The carrier plate ring is produced, for example, by means of stamping and forming, in particular by deep drawing, the carrier plate ring with the second leg preferably coming into contact with the outer ring or the inner ring. The carrier plate ring can also be C-shaped, U-shaped or in other conceivable shapes. In other words, in these cases the carrier sheet metal ring has at least one axially extending leg and at least one radially extending leg. Alternatively, the carrier plate ring can also be designed as a sleeve, in which case the carrier plate ring has only one axially extending leg.

The carrier sheet metal ring is pressed onto the respective rotatable ring in the wheel bearing or is arranged in a stationary manner, that is to say axially and non-rotatably, using an alternative suitable method. In contrast, using the example of the L-shaped carrier sheet metal ring, the first leg extends spatially between the inner and outer ring in the radial direction, the coding ring being essentially connected to the first leg and interacting with a sensor device.

The sensor device can comprise one or more sensor elements, such as, for example, a speed sensor, wherein the sensor elements can be based on different physical operating principles.

The term “unipolar magnetized encoder” is to be understood as an encoder whose magnetized material has only one polarity. Accordingly, this does not mean that the coding ring has a change in polarity. Rather, the coding ring has a single and only one-way magnetization over the entire circumference, which varies in intensity.

To generate the magnetization of the coding ring, a magnetizing tool or a magnetizing head provided for this purpose is used, which has, for example, a cylindrical base surface and generates a unipolar magnetization on the coding ring. It is advantageous that such a magnetization tool is comparatively simple in design and manufacture compared to magnetization tools which are provided for the production of multipole or multipole encoders. This makes it possible to use a single magnetization tool regardless of the size of the encoder or the number of increments.

Particularly suitable as the material for the coding ring are elastomers and thermoplastics which are enriched with a corresponding magnetic filler, for example strontium ferrite SrFe.

The carrier plate ring preferably has at least one cutout, the coding ring coming to rest in the at least one cutout. The at least one recess is preferably axially continuous on the first radial leg of the carrier sheet metal ring. The at least one recess is therefore to be understood as an opening which is filled or closed by the material of the coding ring. In other words, the recess runs axially, that is, parallel to the longitudinal axis of the coding ring or of the carrier plate ring.

Furthermore, a plurality of cutouts are preferably distributed over the circumference, the coding ring accordingly being perforated in order to implement a varying or changing material thickness of the coding ring and an associated alternating magnetic field with the same polarity.

Furthermore, the carrier sheet metal ring preferably has at least one depression. A recess is to be understood as a non-continuous recess in the carrier sheet metal ring which is filled with the material of the coding ring. Thus, a varying material thickness with an alternating magnetic field is also realized in the manner described above. If a plurality of depressions are provided, these can extend, for example in sections, in the circumferential direction in order to realize an alternating strength of the magnetic field. It is also conceivable to design the at least one depression with a changing depth.

According to a preferred embodiment, the carrier plate ring has a radially extending first leg and an axially extending second leg, the at least one depression being formed on the first leg, and the at least one depression being essentially radial. The carrier sheet metal ring preferably has a plurality of radial depressions distributed on the circumference of the first leg of the coding ring. In other words, the first leg of the carrier sheet metal ring is toothed, the coding ring being designed to correspond thereto.

The carrier sheet metal ring and / or the coding ring are preferably of wave-shaped design. In other words, either the shape of the carrier plate ring or the design of the coding ring on the carrier plate ring dictates the varying material thickness of the coding ring.

The coding ring is preferably arranged in full on the carrier sheet metal ring. In this case, either the coding ring or the carrier plate ring has such a configuration that the material thickness of the coding ring varies in the circumferential direction. Alternatively, the single-pole magnetized coding ring is arranged in sections on the carrier sheet metal ring. In other words, the coding ring is interrupted in sections, so that no magnetic field can be detected by the sensor device in the sections of the coding ring without material. A change in the magnetic field of the encoder in the circumferential direction is thus realized due to the lack of coding ring material at least in sections.

The wheel bearing comprising the encoder preferably has at least one inner ring and one outer ring, the coding ring being arranged on an outer peripheral surface of the inner ring or on an inner peripheral surface of the outer ring. It is also conceivable that the coding ring and / or the carrier plate ring comes to rest at least partially on an end face of the inner or outer ring and / or is at least partially received in a recess or recess of the respective component. Such an encoder can also be provided for alternative bearing elements, a displaceable or rotatable component on which the coding ring is arranged being displaceable or rotatable relative to a stationary component. In particular, it is conceivable to provide the encoder for a linear bearing.

The coding ring can be magnetized on the inner or outer ring before assembly. Alternatively, owing to the comparatively simple magnetizability of the coding ring, it is also conceivable to carry out a single-pole magnetization after mounting the encoder in the wheel bearing. Magnetic adhesion or accumulation of ferromagnetic contaminants is thus prevented or reduced.

• 1 eine schematische Schnittdarstellung zur Veranschaulichung des Aufbaus eines teilweise dargestellten erfindungsgemäßen Radlagers mit einem erfindungsgemäßen Kodierer gemäß einer ersten Ausführungsform,
• 2a eine schematische Querschnittdarstellung des Kodierers gemäß 1,
• 2b eine weitere schematische Querschnittdarstellung des Kodierers gemäß 1,
• 3a eine schematische Querschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer zweiten Ausführungsform,
• 3b eine weitere schematische Querschnittdarstellung des Kodierers gemäß 3a,
• 4 eine schematische Längsschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer dritten Ausführungsform,
• 5 eine schematische Längsschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer vierten Ausführungsform,
• 6a eine schematische Längsschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer fünften Ausführungsform,
• 6b eine schematische Querschnittdarstellung des Kodierers gemäß 6a,
• 6c eine weitere schematische Querschnittdarstellung des Kodierers gemäß den 6a und 6b,
• 7a eine schematische Querschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer sechsten Ausführungsform,
• 7b eine weitere schematische Querschnittdarstellung des Kodierers gemäß 7a, und
• 8 eine schematische Längsschnittdarstellung des erfindungsgemäßen Kodierers gemäß einer siebten Ausführungsform.

Further measures improving the invention are shown below together with the description of a preferred embodiment of the invention with reference to the figures, the same or similar elements being provided with the same reference numerals. Here shows

• 1 2 shows a schematic sectional illustration to illustrate the structure of a partially illustrated wheel bearing according to the invention with an encoder according to the invention according to a first embodiment,
• 2a is a schematic cross-sectional view of the encoder according to 1 ,
• 2 B a further schematic cross-sectional representation of the encoder according to 1 ,
• 3a 2 shows a schematic cross-sectional representation of the encoder according to the invention in accordance with a second embodiment,
• 3b a further schematic cross-sectional representation of the encoder according to 3a ,
• 4th 2 shows a schematic longitudinal sectional illustration of the encoder according to the invention in accordance with a third embodiment,
• 5 2 shows a schematic longitudinal sectional illustration of the encoder according to the invention in accordance with a fourth embodiment,
• 6a 2 shows a schematic longitudinal sectional view of the encoder according to the invention in accordance with a fifth embodiment,
• 6b is a schematic cross-sectional view of the encoder according to 6a ,
• 6c a further schematic cross-sectional representation of the encoder according to the 6a and 6b ,
• 7a 2 shows a schematic cross-sectional representation of the encoder according to the invention in accordance with a sixth embodiment,
• 7b a further schematic cross-sectional representation of the encoder according to 7a , and
• 8th is a schematic longitudinal sectional view of the encoder according to the invention according to a seventh embodiment.

According to 1 has a wheel bearing according to the invention 1 an encoder for a vehicle (not shown here) 2nd on, the encoder according to the invention 2nd on an outer peripheral surface 5 an inner ring 3b of the wheel bearing designed as an angular contact ball bearing 1 is rotatably and axially fixed. In particular, the encoder exists 2nd from an L-shaped carrier sheet ring 4th and a magnetized coding ring partially molded thereon by overmolding 7 , where the encoder 2nd with a sensor device 8th , for example, interacts with the speed measurement.

The carrier sheet ring 4th has a first radial leg 4a and a second axial leg 4b on, with the second leg 4b torsionally and axially fixed on the inner ring 3b is arranged. The first leg 4a extends in the radial direction towards the outer ring 3a , with the coding ring 7 essentially all around the first leg 4a of the carrier plate ring 4th is trained. The coding ring 7 is in the wheel bearing during magnetization before or after assembly 1 unipolar magnetized.

According to the 2a and 2 B is the coding ring 7 completely on one end 12th of the first leg 4a upset. The carrier sheet ring 4th points to 2 B also on the first leg 4a a variety of all-round recesses 10th on, in the present case only a recess 10th is shown. So the coding ring comes 7 in the at least one recess 10th to the facility. On the one hand, this prevents a relative movement between the carrier plate ring 4th and coding ring 7 . On the other hand, the coding ring 7 a magnetized layer with varying material thickness, an alternating magnetic field of the same polarity being consequently formed on the surface thereof. Depending on the requirement, the recesses can 10th evenly or unevenly on the circumference of the carrier plate ring 4th be distributed. Furthermore, the recesses 10th have a substantially rectangular or a substantially round shape.

After one in the 3a and 3b shown second embodiment of the encoder 2nd points the first leg 4a several wells distributed around the circumference 6 on. One of the wells 6 is in 3b shown, with the elongated depressions 6 essentially in the circumferential direction of the carrier plate ring 4th extend. In other words, the first leg points 4a in the radial direction due to the depression 6 changing thickness. The wells 6 of the first leg 4a be like in 3a shown by circumferential sections of the first leg 4a interrupted with a radially constant thickness, so that the resulting change in the thickness of the circumferential encoding ring 7 a varying one from the sensor device 1 detectable magnetic field generated. In the present embodiment, the wheel bearing 1 also a sealing element 9 on which with two sealing lips 11 on the carrier sheet ring 4th comes into sealing contact. The sealing element is supported 9 against the outer ring 3a radially. In other words, the encoder 2nd further designed to achieve a sealing effect with a sealing element.

In the 4th to 6 and 8th is a longitudinal section through the first, radially extending leg 4a shown.

To 4th , a third embodiment of the encoder 2nd , shows the first leg 4a a plurality of essentially radially extending depressions distributed around the circumference 6 on. In other words, the first leg has 4a a circumferential toothing for receiving the material of the circumferential coding ring 7 on.

According to 5 , a representation of a fourth embodiment, is the coding ring 7 wavy. The coding ring 7 is on the front 12th of the first leg with varying thickness, so that a continuous change of the magnetic coding ring 7 generated magnetic field is set. The first, radial trending thighs 4a has a constant thickness.

A fifth embodiment of the encoder 2nd according to the 6a to 6c provides that the coding ring 7 only in sections on the carrier sheet metal ring 4th is arranged. In other words, the coding ring 7 like this on the first leg 4a arranged that circumferential sections with material of the coding ring 7 and further sections arranged therebetween in the circumferential direction without material of the coding ring 7 be formed. The layer thickness of the coding ring formed in sections 7 and the thickness of the carrier sheet ring 4th are constantly trained. The spacing of the respective circumferential sections can be freely selected for the requirements of the wheel bearing.

After the 7a and 7b shows the carrier sheet ring 4th of the encoder 2nd according to a sixth embodiment, further radially extending third legs 4c on, with several third legs 4c on the circumference of the carrier plate ring 4th are distributed. In the circumferential direction in between is the material of the coding ring 7 arranged so that through the only partially formed coding ring 7 a change between existing and nonexistent or only a small magnetic field occurs. The third leg 4c are produced here by means of stamping and forming.

A seventh embodiment of the encoder 2nd according to 8th provides that the carrier sheet metal ring 4th as well as the coding ring 7 are wavy. The radial first leg 4a is formed with a constant thickness, due to the waveform of the first leg 4a axial depressions 6 on the carrier sheet ring 4th are formed by the corresponding bulges 13 the coding ring 7 are filled out. The coding ring 7 is fully developed and has a uniform surface 14 on.

Reference list

1

Wheel bearings

2nd

Encoder

3a

Outer ring

3b

Inner ring

4th

Carrier sheet ring

4a

first leg

4b

second leg

4c

third leg

5

Outer peripheral surface

6

deepening

7

Coding ring

8th

Sensor device

9

Sealing element

10th

Recess

11

Sealing lip

12th

Face

13

Bulge

14

surface

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for better information for 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.

Patent literature cited

• DE 102012204039 A1 [0002]

Claims (9)

Encoder (2) for a wheel bearing (1), comprising a carrier plate ring (4) which is arranged on an outer ring (3a) or on an inner ring (3b) of the wheel bearing (1), the carrier plate ring (4) over the entire circumference is at least partially surrounded by a magnetic coding ring (7), characterized in that the coding ring (7) is of unipolar magnetization. Encoder (2) after Claim 1 , characterized in that the carrier plate ring (4) has at least one recess (10), the coding ring (7) coming into contact in the at least one recess (10). Encoder (2) according to one of the preceding claims, characterized in that the carrier plate ring (4) has at least one recess (6). Encoder (2) according to one of the preceding claims, characterized in that the carrier sheet metal ring (4) has a radially extending first leg (4a) and an axially extending second leg (4b), the at least one depression (6) on the first leg ( 4a), and wherein the at least one depression (6) extends essentially radially. Encoder (2) according to any one of the preceding claims, characterized in that the carrier sheet metal ring (4) is wave-shaped. Encoder (2) according to one of the preceding claims, characterized in that the coding ring (7) is wave-shaped. Encoder (2) according to one of the preceding claims, characterized in that the coding ring (7) is arranged on the carrier sheet metal ring (4) over its entire circumference. Encoder (2) according to one of the Claims 1 to 6 , characterized in that the coding ring (7) is arranged in sections on the carrier plate ring (4). Wheel bearing (1), comprising an encoder (2) according to one of the Claims 1 to 8th The wheel bearing (1) further comprises at least one inner ring (3b) and one outer ring (3a), the encoder (2) being arranged on an outer peripheral surface of the inner ring (3b) or on an inner peripheral surface of the outer ring (3a).

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