DE102007017925A1 - Rotational unit e.g. rotary unit, for use in e.g. milling machine, has outer ring of bearing unit removably connected with housing, and inner ring of bearing unit removably connected with stator or rotor of torque motor - Google Patents

Abstract

The rotational unit (10) has a torque motor (20) arranged within a housing (62) and provided with a stator (22) and a rotor (24). A bearing unit (LE) is connected with the housing and the torque motor, where the bearing unit is arranged at an end of the housing and has an inner ring (28) and an outer ring (30). Tracks (52, 56, 58) are arranged between the inner and outer rings, where rolling elements (60) roll on the tracks. The outer ring is removably connected with the housing, and the inner ring is removably connected with the stator or the rotor of the torque motor.

Description

The The invention relates to a rotary unit according to the preamble of claim 1.

A Such rotation unit finds, for example, in machine tools for editing tasks, Positioning tasks or measuring tasks Use, for example as a turntable for round tables, as a turntable for Turning or milling machines or as horizontally or vertically arranged rotary or pivoting unit for devices. Depending on the purpose of the drive of the rotation unit is carried out by electric motor by a stepper motor or servomotor.

Of the Rotor of such an engine is known by means of a roller bearing pair within a housing stored the rotation unit. However, such roller bearing pairs provide for the Manufacturers of such rotary units are relatively expensive purchased parts, which significantly affect the price of rotation units.

Of the The present invention is therefore based on the object, a rotation unit with a simpler and more cost-effective structure to provide which has a high static stiffness. The rotation unit should also be flexibly configurable and to a variety of tasks be customizable.

main features The invention are specified in the characterizing part of claim 1. Embodiments are the subject of claims 2 to 22.

In a rotary unit having a housing, a torque motor disposed inside the housing and having a stator and a rotor, and a bearing unit connected to the housing and the torque motor disposed at one end of the housing and having an inner ring and an outer ring wherein the outer ring is arranged concentrically to the inner ring and wherein between the inner ring and the outer ring raceways are arranged, on which rolling elements ( 60 ) roll, the invention provides that the outer ring with the housing and the inner ring with a portion of the torque motor is detachably connected.

The rotation unit according to the invention sets Therefore, together from several modules, namely a motor module in shape Torque or torque motor and a bearing module. All Modules can be independently prefabricate each other and - ever according to customer requirements and / or purpose - individually to a complete drive unit put together. This not only reduces the manufacturing costs. Also warehousing and logistics are greatly simplified because no prefabricated rotation units more need to be stored. each Rotation unit can be rather quickly and conveniently to the most diverse customer specifications adapt, be it that the unit is put together in different sizes will be, if it is equipped with other modules.

The The invention further provides that the inner ring with the stator or is releasably connected to the rotor of the torque motor. The rotation unit let yourself thus both as an internal rotor as well as external runners train.

A important development of the invention provides that the outer ring the bearing unit to the housing the rotation unit is infinitely tightened, so that when tightening of the outer ring to the housing a tension of the bearing unit is infinitely adjustable.

The has rotation unit according to the invention a compact design, with only a single storage unit as an integrated special bearing at one end of the rotation unit gets along. This gives a significant price advantage over others Drives.

In a preferred embodiment The invention is the housing the rotation unit at the bearing end with an external thread for receiving an outer ring the bearing unit provided with a corresponding internal thread. Here is the case expediently as cost-effective Tube profile formed.

In a further preferred embodiment According to the invention, the bearing unit comprises a two-part outer ring and a one-piece inner ring, wherein the outer ring an outer flange and a bearing ring axially displaceable to the flange ring arranged which slidably disposed on the inside of the flange is. The flange is at the housing end with an internal thread provided to the external thread of housing the rotation unit corresponds.

In a further preferred embodiment of the invention, the rotation unit further comprises a sensor unit for speed or rotation angle measurement, which is preferably arranged within the housing on the side facing away from the bearing unit of the torque motor. The sensor unit is preferably designed as a rotary encoder. It comprises a gear and a board, which is provided over the circumference with a plurality of sensors, such as Hall sensors. These are preferably at uniform intervals zueinan of the. On the board is also an electronic circuit to process the signals generated by the sensors and possibly evaluate or forward to an evaluation.

In a further preferred embodiment According to the invention, the rotation unit further comprises a brake unit, which preferably arranged on the bearing unit opposite the end of the housing is. The brake unit is preferably as eddy current brake formed with a rotor and a stator. This brake unit is used to decelerate the torque motor and / or reach it in one Lock the angular position.

Further Features, details and advantages of the invention will become apparent the wording of the claims as well as from the following description of exemplary embodiments with reference to FIG Drawings. Show it:

1 a perspective view of a first embodiment of the rotation unit according to the invention,

2 another perspective view of in 1 illustrated embodiment of the rotation unit,

3 a perspective sectional view of the in 1 illustrated embodiment of the rotation unit,

4 a front view of a second embodiment of the rotation unit according to the invention and

5 a cross-sectional view of in 4 illustrated embodiment of the rotation unit with respect to the cutting plane AA.

Same Reference numerals refer to the same or similar Components.

The in the perspective sectional view of 3 illustrated substantially cylindrical rotary unit 10 includes a housing 62 from a tubular profile of preferably aluminum, a cylindrical torque motor or torque motor 20 as an electric drive unit, inside the housing 62 and concentric with the same, and one at one end of the housing 62 coaxial with the same and with the housing 62 and the torque motor 20 connected annular bearing unit LE.

The housing 62 is slightly offset at the bearing end and advantageously with a fine external thread 63 provided for receiving the storage unit LE.

The torque motor designed as an internal rotor 20 includes a stator 22 and one to the stator 22 inside lying rotor 24 , The stator 22 , on the outer circumference opposite the housing 62 is fixed, forms a cylindrical body having a plurality of radially inwardly directed webs, between which individually wound coils 22a are inserted. The rotor 24 preferably consists of a hollow shaft 26 on the outer circumference in one of the stator 22 enclosed area with permanent magnets 25 is provided.

The functioning of the torque motor 20 as such is known to those skilled in the art and is therefore not explained below.

The bearing unit LE is designed as a four-point bearing with grease lubrication and includes an inner ring 28 and an outer ring 30 , where the outer ring 30 concentric with the inner ring 28 is arranged. Between the inner ring 28 and the outer ring 30 are careers 52 . 56 . 58 arranged on which preferably balls 60 Roll as rolling elements, which are spaced from one another by means of a cage, not shown to each other. In principle, other Wälzkörperformen instead of the spherical shape are conceivable.

The outer ring 30 is expediently made in two parts and includes an outer flange ring 32 and one to the flange ring 32 axially displaceable arranged bearing ring 34 on the inside of the flange ring 32 is slidably disposed. Both the flange ring 32 as well as the bearing ring 34 each have a newly executed rolling body career 56 . 58 on. These two Wälzkörperlaufbahnen 56 . 58 together form a v-shaped pair of tracks 56 . 58 with at an angle of 90 ° to each other arranged raceways 56 . 58 passing through the balls 60 are spaced from each other. The flange ring 32 is at the housing end with a convenient fine internal thread 33 provided, which corresponds to the external thread 63 of the housing 62 is trained. Furthermore, the flange ring 32 on the outer circumference a flange collar 38 on, with evenly spaced through holes 44 is provided.

The outer circumference of the non-stepped portion of the housing 62 corresponds to the outer circumference of the housing-side end of the flange ring 32 ,

The inner ring 28 however, is integrally formed and sits frontally on the hollow shaft 26 of the rotor 24 , Here is the inner ring 28 on the circumference over at regular intervals to each other arranged through holes 42 by means of cylinder screws 61 with the hollow shaft 26 screwed. The inner diameter of the inner ring 28 corresponds to the inside diameter of the hollow shaft 26 so that the inner surface 46 of the inner ring 28 flush with the inner surface 48 the hollow shaft 26 concludes. At the outer ring 30 facing Wälzkörperseite has the inner ring 28 two newly executed Wälzkörperlaufbahnen 52 on, which together also a v-shaped pair of tracks with at an angle of 90 ° to each other arranged raceways 52 form by a circumferential groove 53 are spaced from each other. In addition, the inner ring 28 on this Wälzkörperseite on both sides of the raceways 52 . 56 . 58 each a circumferential groove 54 for a sealing ring 55 on. The inner ring 28 also has a flange collar on the outer circumference 36 on, with evenly spaced through holes 40 is provided. The rolling element raceways 52 . 56 . 58 the two bearing rings 28 . 30 are either laser-hardened or coated accordingly.

The rotation unit 10 also has a sensor unit SE for speed or angle measurement, which within the housing 62 preferably on the bearing unit LE remote from the end face of the torque motor 20 is arranged. This sensor unit SE is preferably designed as a rotary encoder and includes a gear 66 and a board 64 , The board 64 is designed as an annular disc and concentric with the hollow shaft 26 of the rotor 24 arranged while the gear 66 on the hollow shaft 26 concentric with the board 64 is arranged.

The board 64 is with several Hall sensors 68 provided over the circumference of the board 64 are arranged such that the teeth 67 of the gear 66 above the sensors 68 lie. On the board 64 There is also an electronic circuit, not shown, to process the signals generated by the Hall sensors and possibly evaluate or forward to an evaluation.

The in the cross-sectional view of 4 illustrated alternative embodiment of the invention also shows a substantially cylindrical rotary unit 10 , which also comprises an annular brake unit BE, which preferably at the bearing unit LE opposite end of the housing 62 is arranged on the front side on the same. This brake unit BE serves to decelerate the torque motor and / or to lock in an achieved rotational angle position. Brake unit BE is preferably as eddy current brake with a rotor 74 and a stator 72 educated. Run as an internal rotor is the rotor 74 inside lying to the stator 72 arranged. According to this embodiment of the invention, the housing 62 on the circumference with uniformly spaced through holes 63 provided in the longitudinal direction through which hexagon screws 65 from the flange ring 32 with corresponding additional, corresponding through holes 35 to the stator 72 the brake unit BE with corresponding blind holes 78 for screwing the stator 72 with the housing 62 extend.

The rotor 74 the brake unit BE, however, is on the circumference by means of cylinder screws 76 over a spacer 69 on the side facing away from the storage unit LE end face of the hollow shaft 26 of the rotor 24 sits, with the hollow shaft 26 screwed.

Furthermore, the formed as an annular disc board 64 inside the case 62 concentric with this spacer 69 arranged while the gear 66 on this spacer 69 coaxial to the board 64 is arranged.

In the two illustrated embodiments of the invention, the rotation unit 10 designed as an internal rotor, wherein the rotor 24 of the torque motor 20 the inner ring 28 the bearing unit LE and, as in the case of the second embodiment of the invention, also the rotor 74 the brake unit BE drives. This rotation unit 10 is suitable for example as a rotary unit for use in a milling machine for receiving and driving a rotating cutting tool for cutting materials.

Advantageous to the rotation unit according to the invention 10 is that it has a compact structure, which makes do with only a single storage unit as an integrated special bearing at one end of the rotary unit. This results in a significant price advantage over other drives.

Furthermore, it is advantageous that the flange ring 32 of the outer ring 30 the bearing unit LE via the threaded connection between the external thread 63 of the housing 62 and the internal thread 33 of the flange ring 32 to the housing 62 infinitely adjustable, so that when tightening the flange ring 32 to the housing 62 a continuous clamping of the bearing unit LE is adjustable by the opposite the flange ring 32 axially displaceably arranged bearing ring 34 from the front edge of the bearing-side end of the housing 62 when tightening the flange ring 32 to the housing 62 against the balls 60 the storage unit LE presses. A once achieved desired setting is ensured by the fact that the two threaded parts 32 . 62 glued together.

Furthermore, the operation of the rotary unit according to the invention shown here is 10 In principle, also invertible, so that the rotation unit according to the invention 10 Also executable as an external rotor, in which the rotor of the torque motor 20 located outside the stator and the housing 62 , the outer ring 30 the bearing unit LE and, in the case of the second embodiment of the invention, a rotor disposed outside the stator of the brake unit BE drives.

On top of that, the rotation unit 10 has simple components that can be quickly adapted to a wide variety of customer specifications, whether they are assembled in different sizes, whether they are equipped with different units or modules. Because the case 62 the rotation unit 10 Depending on the size of the motor used, it may represent a simple tube profile 20 be cut to length appropriately. The ring elements 28 . 30 The storage unit LE represent simple and cost-effective turned parts, which at the same time the raceways 52 . 56 . 58 for the balls 60 form. The entire rotation unit 10 consists of just a few components that are easy to handle and can be quickly attached to the motor unit.

The invention is not limited to one of the above-described embodiments, but can be modified in many ways. It can be seen that the present invention is a rotation unit 10 concerns, with a housing 62 for receiving a torque motor 20 and a bearing unit LE, a torque motor 20 inside the case 62 is arranged and a stator 22 and a rotor 24 and one with the housing 62 and the torque motor 20 associated storage unit LE, which at one end of the housing 62 is arranged and an inner ring 28 and an outer ring 30 having, wherein the outer ring 30 concentric with the inner ring 28 is arranged and being between the inner ring 28 and the outer ring 30 raceways 52 . 56 . 58 are arranged, on which rolling elements 60 roll.

The outer ring 30 the storage unit LE is according to the invention to the housing 62 is infinitely tightenable, so that when tightening the outer ring 30 to the housing 62 a tension of the bearing unit LE is infinitely adjustable

• a) einem Motormodul (Torquemotor/Drehmomentmotor 20);
• b) Lagermodul (Lagereinheit LE);
• c) Sensormodul (Elektronikmodul, Sensoreinheit SE);
• d) Bremsmodul (Bremseinheit BE).

The rotation unit is therefore composed of the following modules:

• a) a motor module (torque motor / torque motor 20 );
• b) storage module (storage unit LE);
• c) sensor module (electronic module, sensor unit SE);
• d) Brake module (brake unit BE).

• – Die gesamte Rotationseinheit 10 lässt sich rasch und bequem an die unterschiedlichsten Kundenspezifikationen anpassen, sei es, dass die Einheit in unterschiedlichen Größen zusammengestellt wird, sei es, dass sie mit verschiedenen Modulen ausgestattet wird.
• – Das Gehäuse 62 ist ein einfaches Rohrprofil, dass je nach Größe des Motors 20 passend abgelängt werden kann.
• – Die Ringelemente 28, 30 des Lagermoduls LE sind einfache Drehteile, die kostengünstig zu fertigen sind und die zugleich die Laufflächen 52, 56, 58 für die Kugeln 60 bilden.
• – Das gesamte Lagermodul LE besteht aus nur wenigen Bauteilen, die einfach zu handhaben sind und die rasch am Motormodul 20 montiert werden können.
• – Das Außengewinde 63 am Gehäuse 62 und das Innengewinde 33 im Außenring 30 verbinden den Außenring 30 des Lagermoduls LE mit dem Gehäuse 62. Darüber hinaus lässt sich über die Gewindeverbindung 33, 63 die Vorspannung im Lager einstellen, indem der axial verschieblich gelagerte Lagerring 34 von der Stirnkante des Gehäuseendes 69 gegen die Kugeln 60 gedrückt wird. Ist die gewünschte Einstellung erreicht, werden die Gewindeteile 33, 63 miteinander verklebt.
• – Das System lässt sich als Innenläufer (wie dargestellt) oder als Außenläufer konzipieren.

The most important advantages of the rotation unit according to the invention are as follows:

• - The entire rotation unit 10 It can be quickly and easily adapted to a wide variety of customer specifications, whether the unit is assembled in different sizes, whether it is equipped with different modules.
• - The case 62 is a simple tube profile that, depending on the size of the engine 20 can be cut to length.
• - The ring elements 28 . 30 the storage module LE are simple turned parts that are inexpensive to manufacture and at the same time the treads 52 . 56 . 58 for the balls 60 form.
• - The entire storage module LE consists of only a few components, which are easy to handle and quickly on the motor module 20 can be mounted.
• - The external thread 63 on the housing 62 and the internal thread 33 in the outer ring 30 connect the outer ring 30 of the storage module LE with the housing 62 , In addition, can be over the threaded connection 33 . 63 adjust the preload in the bearing by the axially displaceably mounted bearing ring 34 from the front edge of the housing end 69 against the balls 60 is pressed. When the desired setting is achieved, the threaded parts become 33 . 63 glued together.
• - The system can be designed as an internal rotor (as shown) or as an external rotor.

All from the claims, Description and drawing of the features and advantages, including constructive details, spatial Arrangements and method steps, both individually also be essential to the invention in the most diverse combinations.

10

rotation unit

20

torque motor

22

stator

24

rotor

25

permanent magnets

26

hollow shaft

28

inner ring

30

outer ring

32

flange

34

bearing ring

33

inner thread

36

flange collar of the inner ring

38

flange collar of the outer ring

40

longitudinal bore

42

longitudinal bore

44

longitudinal bore

46

Inner surface of the inner ring

48

Inner surface of the hollow shaft

50

Spigot

52

Treads of the inner ring

54

encircling groove

55

seals

56

Tread of the bearing ring

58

Tread of the flange ring

60

rolling elements

61

cylinder head screw

62

casing

63

external thread

64

circuit board

65

Hex bolt

66

gear

67

teeth

68

Hall sensor

69

housing end

70

cylinder head screw

72

stator

74

rotor

76

cylinder head screw

78

blind

LE

storage unit

SE

sensor unit

BE

brake unit

Claims (22)

Rotation unit - with a housing ( 62 ), - with a torque motor ( 20 ) inside the case ( 62 ) and a stator ( 22 ) and a rotor ( 24 ), and - with one with the housing ( 62 ) and the torque motor ( 20 ) connected to one end of the housing (LE). 62 ) is arranged and an inner ring ( 28 ) and an outer ring ( 30 ), wherein the outer ring ( 30 ) concentric with the inner ring ( 28 ) and between the inner ring ( 28 ) and the outer ring ( 30 ) Careers ( 52 . 56 . 58 ) are arranged on which rolling elements ( 60 ), characterized in that the outer ring ( 30 ) with the housing ( 62 ) and the inner ring ( 28 ) with a part ( 22 . 24 ) of the torque motor ( 20 ) is releasably connected. Rotary unit according to claim 1, characterized in that the inner ring ( 28 ) with the stator ( 22 ) or with the rotor ( 24 ) of the torque motor ( 20 ) is releasably connected. Rotary unit according to claim 1 or 2, characterized in that the outer ring ( 30 ) of the bearing unit (LE) to the housing ( 62 ) is infinitely tightenable, so that when tightening the outer ring ( 30 ) to the housing ( 62 ) a tension of the bearing unit (LE) is infinitely adjustable. Rotary unit according to claim 3, characterized in that the outer ring ( 30 ) of the storage unit (LE) as an integral part of the housing ( 62 ) is trained. Rotary unit according to one of claims 1 to 4, characterized in that the housing ( 62 ) at the bearing end with an external thread ( 63 ) for receiving an outer ring ( 30 ) of the bearing unit (LE) is provided with a corresponding internal thread. Rotary unit according to one of claims 1 to 5, characterized in that the housing ( 62 ) on the circumference with equally spaced through holes ( 63 ) is provided in the longitudinal direction for receiving a brake unit (BE). Rotary unit according to one of claims 1 to 6, characterized in that the bearing unit (LE) a two-piece outer ring ( 30 ) and a one-piece inner ring ( 28 ), wherein the outer ring ( 30 ) an outer flange ring ( 32 ) and one to the flange ring ( 32 ) axially displaceably arranged bearing ring ( 34 ), which on the inside of the flange ( 32 ) is slidably disposed. Rotary unit according to claim 7, characterized in that the flange ( 32 ) at the housing end with an internal thread ( 33 ) for attachment to the housing ( 62 ) is provided. Rotary unit according to claim 8, characterized in that the flange ( 32 ) on the outer circumference of a flange collar ( 38 ) with equally spaced holes (FIG. 44 ) is provided. Rotary unit according to one of claims 1 to 9, characterized in that the inner ring ( 28 ) on the outer ring ( 30 ) facing side on both sides of the raceways ( 52 . 56 . 58 ) with a circumferential groove ( 54 ) for a sealing ring ( 55 ) is provided. Rotary unit according to one of claims 1 to 10, characterized in that the inner ring ( 28 ) on the outer circumference of a flange collar ( 36 ) with equally spaced holes (FIG. 40 ) is provided. Rotary unit according to one of claims 1 to 11, characterized in that between the inner ring ( 28 ) and the outer ring ( 30 ) arranged raceways as pairs of tracks ( 52 . 56 . 58 ) are formed. Rotary unit according to one of claims 1 to 12, characterized in that the bearing unit (LE) as a four-point bearing is trained. Rotary unit according to one of claims 1 to 13, characterized in that the rotation unit further comprises a sensor unit (SE), which within the housing ( 62 ) on the bearing unit (LE) facing away from the end face of the torque motor ( 20 ) is arranged. Rotary unit according to claim 15, characterized in that the sensor unit (SE) is designed as a rotary encoder and a gear ( 66 ) and a board ( 64 ). Rotary unit according to claim 16, characterized in that the board ( 64 ) is formed as an annular disc concentric with the rotor ( 24 ) while the gear ( 66 ) on the rotor ( 24 ) coaxial with the board ( 64 ) is arranged. Rotary unit according to claim 17, characterized in that the board ( 64 ) is formed as an annular disc which is concentric with a spacer ( 69 ) arranged with the rotor ( 24 ) while the gear ( 66 ) on the spacer ( 69 ) coaxial with the board ( 64 ) is arranged. Rotary unit according to claim 16 or 17, characterized in that the board ( 64 ) with several Hall sensors ( 68 ) provided over the circumference of the board ( 64 ) are arranged to each other such that the teeth ( 67 ) of the gear ( 66 ) above the sensors ( 68 ) lie. Rotary unit according to one of claims 1 to 18, characterized in that the rotation unit further comprises a brake unit (BE), which at the bearing unit (LE) opposite end of the housing (LE) 62 ) is arranged. Rotation unit according to 19, characterized in that the brake unit (BE) as an eddy current brake with a rotor ( 74 ) and a stator ( 72 ) is trained. Rotary unit according to one of claims 1 to 20, characterized in that the rotation unit is designed as an internal rotor, wherein the rotor ( 24 ) of the torque motor ( 20 ) lying inside to the stator ( 22 ) is arranged and at least the inner ring ( 28 ) of the storage unit (LE). Rotary unit according to one of claims 1 to 20, characterized in that the rotation unit is designed as an external rotor, wherein the rotor of the torque motor ( 20 ) is arranged lying outside to the stator and at least the housing ( 62 ) and the outer ring ( 30 ) of the storage unit (LE).