DE102017130644A1 - Bearing unit with a bearing and a sensor for detecting the speed and direction of rotation of an electrical machine - Google Patents

Abstract

The invention relates to a bearing unit with a bearing (1) and a sensor (6) for detecting the rotational speed and direction of rotation of an electric machine, characterized in that the sensor (6) is integrated directly into the bearing (1)

Description

Field of the invention

The invention relates to a bearing unit with a bearing and a sensor for detecting the rotational speed and direction of rotation of an electric machine according to the closer defined in the preamble of claim 1. Art.

Usually deep groove ball bearings with a cost and space consuming resolver are used to detect the angular position in electric motors of vehicles. Out EP 2564 084 B1 a rolling bearing assembly is known in which for detecting the angular position of a first bearing ring relative to a second bearing ring, an angle sensor is provided which has a sensor ring connected to one of the bearing rings.

Summary of the invention

The invention is therefore based on the object to simplify a storage unit of the aforementioned type with regard to their structure and to make cost-effective.

The object is solved by the features of patent claim 1. Further advantageous embodiments will become apparent from the respective dependent claims, the description and the drawings.

It is proposed a storage unit with a bearing and a sensor for an electric machine, wherein the sensor is integrated into the camp. In this case, the bearing can replace the resolver with an integrated in this sensor for speed and direction of rotation of the electric machine. In this way, a resolver function in the bearing, in particular in a rolling bearing, preferably a deep groove ball bearing, space, weight and cost savings can be integrated. The bearing unit according to the invention can be used in all sizes and types of bearings and is particularly advantageous in bearings with an outer diameter greater than 40 mm used.

Preferably, the detection takes place directly on the rolling elements, in particular the balls, on the cage of the bearing or on or in a seal of the bearing. Since the sensor unit is integrated directly into the bearing in the storage unit according to the invention, an additional attachment, in particular a sensor ring for material measure is avoided. As a result, a narrow and compact design is achieved and simplifies assembly, which is particularly important for vehicles of electric mobility of great importance.

The storage unit according to the invention can be used particularly advantageously in the field of electromobility, in particular on electrically driven axles of vehicles, wheel hub motors and hybrid drives. Also conceivable is an application for electric motor bearings in the industrial sector or in machine tools.

The sensor is preferably based on an optical, a capacitive or built on a Hall effect and provides high-resolution information about the speed and direction of rotation of the rotor shaft of the electric machine. This information is provided to an inverter. The detection can be done via vorbeidrehende rolling elements or cage parts such as pockets for the rolling elements of the bearing or a so-called sensor kit (Vario-Sense) for deep groove ball bearings. It is also conceivable to provide a seal (DCM) similar to a wheel bearing with a magnetic coding for detection. It is also possible to use a vulcanized toothed disk for detection. A detection is still possible via a non-circular bearing inner ring of the camp. It is also possible to use vibration or sound / structure-borne sound for detection or so-called Barkhausen noise for detection. Furthermore, it is possible to detect by the sensor the vorbeidrehenden teeth of one or more gears.

list of figures

• 1 eine erfindungsgemäße Lagereinheit in einem ersten Ausführungsbeispiel,
• 2 die Lagereinheit in einer Explosivdarstellung,
• 4 bis 6 Einzelansichten der Lagereinheit,
• 7 eine erfindungsgemäße Lagereinheit in einem zweiten Ausführungsbeispiel,
• 8 eine erfindungsgemäße Lagereinheit in einem dritten Ausführungsbeispiel.

Further features of the invention will become apparent from the following description and from the drawings, in which several embodiments of the invention are shown in simplified form. Show it:

• 1 a storage unit according to the invention in a first embodiment,
• 2 the storage unit in an exploded view,
• 4 to 6 Individual views of the storage unit,
• 7 a storage unit according to the invention in a second embodiment,
• 8th a storage unit according to the invention in a third embodiment.

Detailed description of the drawings

1 shows a storage unit according to the invention with a bearing 1 as a deep groove ball bearing over the one rotor shaft 2 a not shown electric motor to a housing 3 is radially supported. The warehouse 1 has one with the inner diameter on the outer diameter of the rotor shaft 2 supported bearing inner ring 4 and one with the outer diameter at the inner diameter of the housing 3 supported bearing outer ring 5 on. Between the bearing inner and outer ring 4 . 5 arranged rolling elements are guided in a Wälzkörperkäfig. In the camp 1 is a sensor 6 for detecting the speed and direction of rotation of the rotor shaft 2 integrated. For this purpose are bearing inner ring 4 and bearing outer ring 5 extended at one axial end and comprise an annular space with a sensor receptacle integrally connected in this way 7 backpack-like, in which the sensors 6 is arranged. The from the bearing inner ring 4 and bearing outer ring 5 included sensor mount 7 forms a kind of one-piece connected modular system, in which the sensors 6 with different sensors and a plug or cable module 8th can be integrated. The required axial space is marked by a double arrow.

2 shows the components of a running as a so-called sensor bearing bearing unit. This includes the bearing designed as a ball bearing 1 a support ring 9 , a sensor 6 with three different functions: speed, temperature and force (distance), a cable module 8th , a backbone 10 , an encoder 11 and a module carrier 12 ,

In 4 to 6 is the storage unit according to the invention in partial views with the bearing 1 , Support ring 9 and encoders 12 ( 4 ) and with the sensor equipped with various sensors 6 with module carrier 12 and backbone 10 ( 5 ) as well as with cable module 8th as a ready-to-install sensor bearing assembly ( 6 ).

The storage unit allows the detection and transmission of operating variables for controlling the electric machine. It includes a sensor assembly that can be easily adapted to the application and installation conditions for different bearing types, for different diameters and for various applications in modular design. The bearing unit has a fixed axial space and is with a maintenance-free bearing 1 executed.

7 shows a variant of a bearing unit according to the invention with one on the rotor shaft 2 coaxial with this and non-rotatably arranged with this toothed disc 13 , The in the sensor holder 7 arranged sensor 6 includes two in the sensor receptacle 7 attached sensors 14 . 15 : one after axially inside the bearing 1 aligned first sensor 14 and one axially outward on the teeth 16 the toothed disc 13 aligned second sensor 15 (as indicated by an arrow). The sensors 14 . 15 may have optical, magnetic or Hall effect or sound or noise based signal generation. Here, the serves in the camp 1 aligned first sensor 14 as a signal generator by detecting the rolling elements 17 or balls or the Wälzkörperkäfigs of, for example out of round, bearing inner ring 4 while the signal generator of the second sensor 15 on the detection of the gearing 16 the toothed disc 13 based. In a modification, instead of the latter, a toothed reinforcement of a gasket or the like can be used. serve for signal generation.

In a further variant of a storage unit according to the invention 8th includes a sensor system 6 with one in the sensor holder 7 on the axially extended bearing outer ring attached sensor 18 , the one on the outer diameter of the axially elongated bearing inner ring 4 rotatably mounted additional radial seal 19 is directed (as indicated by an arrow). For example, the seal may be magnetized (similar to a DCM) for magnetic signal generation or toothed, for example, for optical signal generation.

LIST OF REFERENCE NUMBERS

1

warehouse

2

rotor shaft

3

casing

4

Bearing inner ring

5

Bearing outer ring

6

sensors

7

Sensor retaining

8th

Plug or cable module

9

support ring

10

backbone

11

encoder

12

module carrier

13

toothed washer

14

sensor

15

sensor

16

gearing

17

rolling elements

18

sensor

19

poetry

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

• EP 2564084 B1 [0002]

Claims (1)

Bearing unit with a bearing (1) and a sensor (6) for detecting the speed and direction of rotation of an electrical machine, characterized in that the sensor (6) in the bearing (1) is integrated.

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