DE102010062480A1 - Rolling bearing assembly used in gearbox of engine, has rotary encoder and code transducer that are accommodated within transmitter housings comprising rotatably mounted coding unit coupled with shaft - Google Patents

Abstract

The rolling bearing assembly (1) has a shaft bearing (5) that is equipped with bearing rings (9,11) and an intermediate rolling element (13). One bearing ring (9) is seated on a shaft (3) and another bearing ring (11) is seated on the housing bearing seat (17) of shaft housing components (7,7a). A rotary encoder (19) and a code transducer (23) are accommodated within transmitter housings (21a,21b). A coding unit (25) coupled to the shaft, is rotatably mounted within the transmitter housings.

Description

The invention relates to a rolling bearing assembly, comprising at least one shaft roller bearing with a first bearing ring, with a second bearing ring and rolling elements arranged therebetween, further comprising a shaft on which the first bearing ring is seated, a shaft housing component with a bearing seat on which the second bearing ring and a rotary encoder which has a transmitter housing, a Kodeaufnehmer which is arranged in the encoder housing and having a coding device which is coupled to the shaft.

The DE 43 23 444 A1 discloses a composite annular encoder having a multi-pole ring fixedly connected to a metallic carrier and adapted for fitting rolling bearings provided with an information sensing system, for example for detecting rotational speed. Furthermore, an equipped with such designed as a composite part annular encoder rolling bearing is described with an information sensor.

The object of the invention is to improve a shaft bearing with a rotary encoder.

The object of the invention is achieved by a rolling bearing arrangement, comprising at least one shaft roller bearing with a first bearing ring, with a second bearing ring and rollers arranged therebetween, further comprising a shaft on which the first bearing ring is seated, a shaft housing component with a bearing seat on wherein the second bearing ring is seated, and a rotary encoder having a transmitter housing, a Kodeaufnehmer which is arranged in the encoder housing and having a coding device which is coupled to the shaft, wherein the encoder housing connected to the shaft housing member and the coding device by means of a donor rolling bearing assembly is rotatably mounted in the encoder housing.

Rotary encoders, which are also referred to as encoders or encoders, serve to generate signals from movements. You can optically, magnetically or mechanically determine the angular position and / or the number of revolutions of waves, for example. In that regard, encoders may be transmitters which detect the current position of a shaft or a drive unit and output, for example, as an electrical signal. Rotary encoders or encoders can have incremental, to-be-counted or else absolute material measures, for example in the form of line patterns, magnetizations or contacts. Non-absolute encoders or encoders are also called incremental encoders. With the help of the output signal of a rotary encoder or encoder, a drive unit equipped with it can perform reproducible movements and, in the case of an absolute encoder, can return to the starting position even after the machine or drive has been switched off. Incremental encoders, on the other hand, require an additional encoder, for example a limit switch, to search for the reference position.

In magnetic systems, coding can be carried out either by evaluating the position of a rotating magnet or by evaluating a magnetic field modulated by a material measure. For systems with optical detection, the coding can be done via a code disk. Measuring standards can be components of measuring devices which represent specific individual values of a measured variable or of a sequence of values of a measured variable. Material measures in this respect provide one or more fixed values of a size, for example a rotation angle or a rotational speed. The coding device can thus be in the form of a code disk, for example a circular disk arranged around the shaft, which can have the material measures, such as a bar code.

According to the invention it is thus provided that the coding device is rotatably mounted in the transmitter housing by means of a donor rolling bearing assembly. The encoder rolling bearing assembly is a separate, d. H. separate rolling bearing assembly to the actual rolling bearings, which store the shaft in the shaft housing or the shaft housing component. In order to position the encoder in a clear way with respect to the shaft, the encoder housing is firmly connected to the shaft housing component.

The donor roller bearing assembly may be formed as an employee storage, which has at least two donor roller bearings, in particular deep groove ball bearings, which are braced against each other. By means of an employed storage, the coding device, which may be, for example, a coding disc, are mounted particularly precisely rotatable in the encoder housing. As a result, the coding disc is due to the fixed connection of the encoder housing with the shaft housing component, spatially particularly well defined. Thus, for example, concentricity deviations of the shaft can not be transferred or only reduced to the coding disk. Thus, the encoder can operate error-free even with inaccuracies on the shaft and / or high impact loads on the shaft during operation.

The encoder rolling bearing arrangement can be set in an X arrangement and the coding device can be arranged in the axial direction between the two encoder rolling bearings. By forming the encoder rolling bearings in an X arrangement, a stable, backlash-free storage of the coding device, ie the Encoder or the material measure within the encoder reached. In this case, the coding device with the shaft only via a shaft-hub connection, such as a key and passport, be coupled in the direction of rotation. Non-uniformities in the course of the shaft can be compensated or damped via the shaft-hub connection, so that they are not transmitted or at least reduced to the rotary encoder or the coding device.

In this case, the coding device may be connected to a sleeve which is non-rotatably connected to the shaft and which sleeve has bearing seats for inner rings of the two encoder rolling bearings. The coding device is not sitting directly on the shaft in this embodiment via the shaft-hub connection, but the coding device is seated on the sleeve and the sleeve is coupled via the shaft-hub connection to the shaft.

Alternatively, the coding device may be integrally formed with a sleeve which is rotatably connected to the shaft and which sleeve has bearing seats for inner rings of the two encoder rolling bearings. In other words, the coding device may have a sleeve-shaped portion which surrounds the shaft. In this case, the sleeve-shaped portion may be coupled via a shaft-hub connection to the shaft. The coding device is rotatably mounted in the encoder housing via the sleeve-shaped section and its bearing seats for inner rings via the encoder rolling bearings.

In a modification, the sleeve may have a raceway for a sealing lip of a radial shaft sealing ring in addition to or as a replacement for a sleeve which has bearing seats for inner rings of the two encoder rolling bearings. Consequently, in such a modification, the coding device may be connected to a sleeve which is rotatably connected to the shaft and which sleeve, complementary or replacement to bearing seats for inner rings of the two encoder rolling bearings, a raceway for a sealing lip of a radial shaft seal.

In an alternative modification, therefore, the coding device may be integrally formed with a sleeve which is rotatably connected to the shaft and which sleeve, complementary or replacing bearing seats for inner rings of the two encoder rolling bearings, a raceway for a sealing lip of a radial shaft seal.

In all embodiments of the invention, the two donor roller bearings by means of a two-part encoder housing, the two outer rings of the two donor bearings are braced against each other, employed.

The encoder rolling bearing arrangement may alternatively be employed in tandem with an X-arrangement and the coding device may be arranged in the axial direction on the side of the encoder rolling bearing on which the contact lines of the encoder rolling bearing arrangement intersect the center axis. The coding device can be arranged in particular on an outer ring of the encoder rolling bearing.

An inner ring of a first encoder rolling bearing may be connected to an outer ring of a second encoder rolling bearing by an annular disc which is coupled by means of a shaft-hub connection to the shaft.

In all embodiments according to the invention, the transmitter housing can have a seat on which a radial shaft sealing ring is arranged. The seat may be formed integrally with the encoder housing, for example by a recess on the outer wall of the encoder housing. Alternatively, the seat may be provided on a separate component, in particular on an annular flange, and the separate component or the annular flange may be connected to the encoder housing, for example detachably by means of screws or a threaded section on the annular flange and the encoder housing.

In all embodiments according to the invention, the shaft housing component may be a bearing plate of a gearbox or of an engine, in particular of an electric motor.

In all embodiments according to the invention, the shaft housing component, in particular the bearing plate can have a receiving seat, in particular a recessed from the front side of the shaft housing component or the bearing plate ring seat, in which the encoder housing is rotatably inserted.

In summary, the invention can thus provide a solution for the acquisition of application measurement data, such as rotational angular positions of waves and / or rotational speeds or rotational speeds of waves.

The collection of application metrics plays an increasing role in the quest for more efficient applications. Thus, in machine construction, monitoring of machine conditions (condition monitoring) with measurement data such as, for example, the rotational speed or the direction of rotation of a machine is of great importance. Especially with electric motors, especially with commutator motors, absolute encoders are used for effective control of the system. According to the invention, in particular an absolute encoder can be realized on an optical basis. It can be a compact design of the engine with simultaneous control of the engine are possible.

Absolute encoders can be flanged at the end of motor shafts, for example via flexible couplings. In such installation situations, the encoder is exposed from the entire motor assembly unprotected, which may result in increased damage during installation or maintenance. To avoid this damage, either additional parts around the encoder must be arranged protectively, or the encoder must be countersunk in the system.

According to the invention, an encapsulated, self-contained sensor unit can be realized on an optical basis, which, for example, an absolute angle measurement signal, which is suitable, inter alia, for driving commutator motors available. In this case, a design can be achieved in which a hollow shaft encoder can be realized with a continuous shaft. Such a design may differ from known encoders by the storage concept and the assembly of the material measure. By employing two roller bearings, an optimization can be achieved, in particular, for large shaft diameters of approximately 80 mm or larger. Thus, even larger electric motors, such as gearless elevator machines can be advantageously controlled.

According to the invention, a mounting of the encoder can be done directly on the bearing plate of the engine. This can result in a variety of benefits.

For example, by a hired storage concept and a connection of a carrier disk with a material measure, d. H. a coding device, the sensor or a rotary encoder, increased round and plan run accuracies are achieved, which allow in particular a use of an optical sensor.

An exemption of the carrier disc relative to the shaft and an associated shaft-hub connection can ensure a running accuracy even with deflection of the drive shaft.

The inventive solutions a more compact design of the engine can be achieved, especially when the sensor can be integrated into an existing, previously unused space, such as an electric motor. Material costs, such as for the shaft, can be reduced as a result.

In an arrangement according to the invention, as can be seen by the example of a gearless elevator machine, the absolute encoder can be protected by the natural environment of the machine, for example by a brake system of the elevator machine. Damage in the adjustment of the encoder or destruction of the entire encoder during assembly or during maintenance can thus be avoided.

In the designs shown in the figures, the sensor, i. H. the encoder, designed as an independent unit, whereby a simplified assembly and interchangeability of the unit is ensured for example by screwing on a bearing plate, in particular by coupling via a feather key to the shaft.

The rotary encoder of the rolling bearing assembly according to the invention can be manufactured as an encapsulated complete unit with a sealing concept. The sealing concept can be integrated and allow operation even in adverse conditions.

By varying the design, an integration of seal including associated tread can be achieved. If necessary, the integrated secondary function of a separation of two rooms to be delimited can be realized.

Various embodiments of the invention are illustrated by way of example in the accompanying schematic drawings. Show it:

1 a partial sectional view of a first embodiment of a rolling bearing assembly according to the invention,

2 a partial sectional view of a second embodiment of a rolling bearing assembly according to the invention,

3 the first embodiment of the rolling bearing assembly according to the invention according to 1 in a perspective sectional view.

One in the 1 exemplary illustrated rolling bearing assembly 1 shows a wave 3 and one of, for example, two shaft bearings 5 , The illustrated shaft rolling bearing 5 stores the wave 3 rotatable in a shaft housing component 7 , The shaft housing component 7 For example, a flange of a machine, in particular a bearing plate 7a a transmission or a motor, in particular an electric motor, be.

The shaft rolling bearing 5 has a first bearing ring 9 and a second bearing ring 11 on. Between the first bearing ring 9 and the second bearing ring 11 are several rolling elements 13 arranged. The wave 3 has a shaft bearing seat 15 on, on which the first bearing ring 9 of the shaft bearing 5 seated. The shaft housing component 7 has a bearing seat 17 in which the second bearing ring 11 of the shaft bearing 5 is used.

The rolling bearing assembly according to the invention 1 also has a rotary encoder 19 on. The encoder 19 includes a transmitter housing 21a . 21b and a Kodeaufnehmer 23 and a coding device 25 , The code recorder 23 is in the encoder housing 21a . 21b arranged. Also the coding device 25 is in the encoder housing 21a . 21b arranged. The coding device 25 is with the wave 3 coupled. In the example shown, the first embodiment according to 1 is the coding device 25 on a sleeve 27 attached. The sleeve 27 is via a shaft-hub connection 29 rotatably on the shaft 3 stored. About the sleeve 27 is the coding device 25 to the wave 3 coupled.

The coding device 25 So is with the sleeve 27 connected. The sleeve 27 is rotatable with the shaft 3 connected. The sleeve 27 has two bearing seats in the illustrated embodiment 31 and 33 for inner rings 35a and 37a on. The first inner ring 35a is part of a first encoder rolling bearing 35 , The first encoder rolling bearing 35 also has an outer ring 35b and rolling balls 35c on. The second inner ring 37a is part of a second encoder rolling bearing 37 , The second encoder rolling bearing 37 also has an outer ring 37b and rolling balls 37c on.

In addition, the sleeve 27 a career 39 for a sealing lip 41a a radial shaft seal 41 on. The career 39 can, for example, as in 1 shown, to the one bearing seat 31 connect or bearing seat 31 and career 39 can through the same lateral surface of the sleeve 27 be formed.

The two encoder rolling bearings 35 and 37 are in the illustrated embodiment by means of a two-part encoder housing 21a and 21b stored. This has an encoder housing 21a a camp seat 43 for the outer ring 35b of the first encoder rolling bearing 35 on. The second encoder housing 21b has another bearing seat 45 for the outer ring 37b of the second encoder rolling bearing 37 on. The two outer rings 35b and 37b the two encoder rolling bearings 35 and 37 are braced against each other, ie it is implemented in the embodiment of an employee storage. In this version is the encoder housing 21a . 21b with a seat 47 executed at which the radial shaft seal 41 is arranged.

Furthermore, the encoder housing 21a . 21b with the shaft housing component 7 or with the end shield 7a connected. Overall, therefore, the coding device 25 by means of a donor rolling bearing arrangement, comprising the two donor rolling bearings 35 and 37 in the encoder housing 21 rotatably mounted.

The encoder rolling bearing arrangement, comprising the two encoder rolling bearings 35 and 37 is in 1 shown in a salaried storage in X-arrangement. Here is the coding device 25 in the axial direction between the two encoder rolling bearings 35 and 37 arranged. The two encoder rolling bearings 35 and 37 are exemplified as deep groove ball bearings.

In the execution according to 1 has the shaft housing component 7 , or the end shield 7a a receiving seat acting as one of the end face of the shaft housing member 7 or the end shield 7a recessed ring seat 49 is formed, in which the encoder housing 21 . 21a . 21b is used rotatably.

The 2 shows a second embodiment of a rolling bearing assembly 1 , Alternative to the rolling bearing arrangement 1 according to 1 is at the in 2 shown embodiment, the coding device 25 separated from the sleeve 27 educated. The sleeve 27 can, as in 2 shown to a thin annular disk 27a be reduced. The ring disk 27a is via a shaft-hub connection 29a rotatably on the shaft 3 stored.

The encoder rolling bearing arrangement, comprising the two encoder rolling bearings 35 and 37 is in 2 alternatively to the X arrangement according to 1 formed in a tandem arrangement. The coding device 25 is in the axial direction on the side of the encoder rolling bearings 35 and 37 arranged on the lines of contact of the encoder rolling bearing assembly intersect the center axis, that is, for example, in the axial height of the second encoder rolling bearing 37 , The coding device 25 can do this on the outer ring 37b of the second encoder rolling bearing 37 be arranged.

Also in the execution according to 2 the donor rolling bearing assembly is designed as an employee storage. The encoder rolling bearing arrangement has the two encoder rolling bearings 35 and 37 on, which are designed as deep groove ball bearings.

The inner ring 35a of the first encoder rolling bearing 35 is with the outer ring 37b of the second encoder rolling bearing 37 through the annular disc 27a connected by means of the shaft-hub connection 29a to the wave 3 is coupled.

Also in the execution according to 2 has the shaft housing component 7 , or the end shield 7a a receiving seat acting as one of the end face of the shaft housing member 7 or the end shield 7a recessed ring seat 49 is formed, in which the encoder housing 21 . 21a . 21b is used rotatably.

For further illustration shows the 3 again the first embodiment of the rolling bearing assembly according to the invention 1 in a perspective sectional view.

LIST OF REFERENCE NUMBERS

1

roller bearing assembly

3

wave

5

Wave Rolling

7

Shaft housing component

7a

end shield

9

first bearing ring

11

second bearing ring

13

rolling elements

15

Shaft bearing seat

17

Housing bearing seat

19

encoders

21a, 21b

encoder housing

23

Kodeaufnehmer

25

coding

27

shell

29

The shaft-hub-connection

31

first bearing seats

33

second bearing seats

35

first encoder rolling bearing

35a

first inner ring

35b

first outer ring

35c

first rolling balls

37

second encoder rolling bearing

37a

second inner ring

37b

second outer ring

37c

second rolling balls

39

career

39a

tensioning device

39b

clamping element

41

Radial shaft seal

41a

sealing lip

43

bearing seat

45

another bearing seat

47

Seat

49

ring seat

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 4323444 A1 [0002]

Claims (10)

Rolling bearing arrangement, comprising at least one shaft rolling bearing ( 5 ) with a first bearing ring ( 9 ), with a second bearing ring ( 11 ) and arranged therebetween rolling elements ( 13 ), further comprising a wave ( 3 ), on which the first bearing ring ( 9 ), a shaft housing component ( 7 . 7a ) with a housing bearing seat ( 17 ), on which the second bearing ring ( 11 ), as well as a rotary encoder ( 19 ), which has an encoder housing ( 21a . 21b ), a code recorder ( 23 ) in the encoder housing ( 21a . 21b ) and a coding device ( 25 ) connected to the shaft ( 3 ), characterized in that the encoder housing ( 21a . 21b ) with the shaft housing component ( 21 . 21a . 21b ) and the coding device ( 25 ) by means of a donor roller bearing assembly in the encoder housing ( 21a . 21b ) is rotatably mounted. Rolling bearing assembly according to claim 1, wherein the encoder rolling bearing assembly is formed as an employee storage, the at least two donor bearings ( 35 . 37 ), in particular deep groove ball bearings, which are braced against each other. Rolling bearing assembly according to claim 2, wherein the donor roller bearing assembly in X-arrangement employed and the coding device ( 25 ) in the axial direction between the two encoder rolling bearings ( 35 . 37 ) is arranged. Rolling arrangement according to Claim 3, in which the coding device ( 25 ) with a sleeve ( 27 ) or in one piece with a sleeve ( 27 ) is formed, which rotatably with the shaft ( 3 ) and which sleeve ( 27 ) Bearing seats ( 31 . 33 ) for inner rings ( 35a . 37a ) of the two encoder rolling bearings ( 35 . 37 ) and / or a career ( 39 ) for a sealing lip ( 41a ) of a radial shaft seal ( 41 ) having. Rolling bearing arrangement according to one of claims 2 to 4, wherein the two encoder rolling bearings ( 35 . 37 ) by means of a two-part transmitter housing ( 21a . 21b ), the two outer rings ( 35b . 37b ) of the two encoder rolling bearings ( 35 . 37 ) are braced against each other, employed. Rolling bearing arrangement according to claim 2 or 3, wherein the donor rolling bearing assembly in tandem and employed the coding device ( 25 ) in the axial direction on that side of the encoder rolling bearings ( 35 . 37 ), in particular on an outer ring ( 37b ) of the encoder rolling bearing ( 37 ) on which the contact lines of the encoder rolling bearing assembly intersect the center axis. Rolling bearing assembly according to claim 6, wherein an inner ring ( 35a ) of a first donor rolling bearing ( 35 ) with an outer ring ( 37b ) of a second encoder rolling bearing ( 37 ) via an annular disc ( 27a ) connected by means of a shaft-hub connection ( 29a ) to the shaft ( 3 ) is coupled. Rolling bearing arrangement according to one of claims 1 to 7, wherein the encoder housing ( 21a . 21b ) a seat ( 47 ), on which a radial shaft sealing ring ( 41 ) is arranged. Rolling bearing arrangement according to one of claims 1 to 8, wherein the shaft housing component ( 7 ) a bearing plate ( 7a ) of a transmission or a motor, in particular an electric motor. Rolling bearing arrangement according to one of claims 1 to 9, wherein the shaft housing component ( 7 ), in particular the bearing plate ( 7a ) a receiving seat, in particular one of the end face of the shaft housing component ( 7 ) or the end shield ( 7a ) recessed ring seat ( 49 ), in which the encoder housing ( 21 . 21a . 21b ) is used rotatably.

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