DE102020111215A1 - Rotor assembly with rotational securing of at least one disk element; as well as electric machine - Google Patents

Abstract

The invention relates to a rotor assembly (1) for an electrical machine (10) of a hybrid or purely electrically driven motor vehicle, with a rotor shaft (2), one on a radial outer side (3) of the rotor shaft (2) and non-rotatably connected to the rotor shaft ( 2) connected magnet unit (4) and at least two disk elements (5, 6) arranged axially next to the magnet unit (4), the disk elements (5, 6) each being connected to the rotor shaft (7a, 7b) by means of a tongue and groove connection (7a, 7b). 2) are non-rotatably connected. The invention also relates to an electrical machine (10) with this rotor assembly (1).

Description

The invention relates to a rotor assembly for an electrical machine and an electrical machine itself, which is preferably used in a hybrid or purely electrically driven motor vehicle.

One requirement for electrical machines and their rotor assemblies is to make the manufacture and assembly of the corresponding components as simple as possible.

This is achieved according to the invention by the subject matter of claim 1. Accordingly, a rotor assembly for an electrical machine of a hybrid or purely electrically driven motor vehicle is claimed, which has a rotor shaft, a magnet unit received on a radial outer side of the rotor shaft and non-rotatably connected to the rotor shaft, and at least two disk elements arranged axially next to the magnet unit, the disk elements are each non-rotatably connected to the rotor shaft by means of a tongue and groove connection.

The tongue and groove connections between the rotor shaft and the respective disk element allow the disk elements to be connected to the rotor shaft in a simple manner during assembly. The respective tongue and groove connection can also be produced as simply as possible. This also significantly reduces the manufacturing effort for the rotor assembly.

Further embodiments are claimed with the subclaims and explained in more detail below.

Accordingly, it is also advantageous if each disk element has directly (preferably exclusively / only) a radially inwardly protruding nose of the tongue and groove connection, which nose is inserted into an axially extending groove of the rotor shaft. The structure of the tongue and groove connections is thus kept as simple as possible. It is also useful if the lugs of both disk elements are pushed into the same (partially continuous) groove of the rotor shaft. This further reduces the manufacturing effort.

Furthermore, it is advantageous if the axially extending groove of the rotor shaft has a first longitudinal region having a first width, in which a radially inwardly protruding (first) nose of a first disk element is received, as well as a having a width, having a second longitudinal region in which a radially inwardly projecting (second) nose of a second disk element is received. The second width (measured in the circumferential direction) of the second longitudinal region is preferably greater than the first width (measured in the circumferential direction) of the first longitudinal region. This prevents incorrect assembly.

In other embodiments, the two noses of the two disk elements have a different shape in addition or as an alternative to the different widths.

Furthermore, it is advantageous if at least one of the disk elements, more preferably each disk element, is supported on at least one axial side by an axial sleeve fixed on the rotor shaft. The axial sleeve is further preferably fixed directly on the outside of the rotor shaft by caulking. This keeps the number of components as low as possible.

It has also proven to be useful if a first disk element, which is fastened to the rotor shaft by means of a first tongue and groove connection, is designed as a balancing disk. That balancing disk is preferably in direct contact with one axial side of the magnet unit. This means that the balancing disk is simply mounted on the rotor shaft.

If the first disk element is arranged axially between the magnet unit and the axial sleeve, the structure is further simplified.

Furthermore, it is advantageous if a second disk element, which is fastened to the rotor shaft by means of a second tongue and groove connection, is designed as a transmitter part for a rotor position sensor. This cleverly expands the functionality of the rotor assembly.

It is also advantageous if the second disk element is axially pretensioned away from the axial sleeve via a plate spring and is pressed against a locking ring. In this way, length compensation can be implemented at the same time without increasing the manufacturing effort significantly.

The invention further relates to an electrical machine for a hybrid or purely electrically driven motor vehicle, with a stator and a rotor assembly according to the invention, arranged radially inside the stator and rotatable relative to the stator, according to at least one of the previously described embodiments.

In other words, according to the invention, a rotational securing of a balancing disk and a stator (transmitter part) of a rotor position sensor is implemented. The rotating parts, for example the balancing disk or the encoder part of the rotor position sensor, are formed by a spring Lug, which is inserted into a groove in the rotor shaft, is attached to the rotor shaft.

The invention will now be explained in more detail below with reference to figures.

• 1 eine Längsschnittdarstellung einer erfindungsgemäßen elektrischen Maschine aufweisend eine nach einem bevorzugten Ausführungsbeispiel ausgebildete Rotorbaugruppe,
• 2 eine perspektivische Darstellung der teilweise explodiert dargestellten Rotorbaugruppe aus 1, wobei unter anderem zwei über eine Feder-Nut-Verbindung mit einer Rotorwelle zu koppelnde Scheibenelemente noch nicht auf der Rotorwelle aufgeschoben sind,
• 3 eine perspektivische Darstellung der in den 1 und 2 eingesetzten Rotorwelle,
• 4 eine perspektivische Darstellung eines in den 1 und 2 eingesetzten, eine Wuchtscheibe ausbildenden, ersten Scheibenelementes, sowie
• 5 eine perspektivische Darstellung eines in den 1 und 2 eingesetzten, ein Geberteil eines Rotorlagesensors ausbildenden, zweiten Scheibenelementes.

Show it:

• 1 a longitudinal sectional view of an electrical machine according to the invention having a rotor assembly designed according to a preferred exemplary embodiment,
• 2 a perspective view of the partially exploded rotor assembly 1 whereby, among other things, two disc elements to be coupled to a rotor shaft via a tongue and groove connection have not yet been pushed onto the rotor shaft,
• 3 a perspective view of the in the 1 and 2 used rotor shaft,
• 4th a perspective view of one in the 1 and 2 used, a balancing disk forming, first disk element, and
• 5 a perspective view of one in the 1 and 2 used, a transducer part of a rotor position sensor forming, second disc element.

The figures are merely of a schematic nature and are used exclusively for understanding the invention. The same elements are provided with the same reference symbols.

With 1 is first a basic structure of an electrical machine according to the invention 10 as it is preferably used as a drive machine of a hybrid or purely electrically driven motor vehicle. The electric machine 10 Typically has a stator that is fixed to the housing and essentially runs in a ring as a whole 16 on. Radially within the stator 16 is a rotor assembly 1 along a central axis of rotation 17th rotatable to the stator 16 stored / recorded. The following is the structure of the rotor assembly designed according to the invention 1 described in more detail.

The rotor assembly has a rotor shaft 2 on. This rotor shaft 2 how with 1 can be seen, is essentially implemented in two parts. On a first tubular shaft part 18a the rotor shaft 2 is a magnet unit 4th the rotor assembly 1 fixed. The magnet unit 4th is implemented as a laminated core with several magnets 19th is equipped. The magnets implemented as permanent magnets 19th thus form a permanently magnetized magnet unit 4th the end. As also in connection with 3 you can see the magnet unit 4th on one on one (radial) outside 3 the rotor shaft 2 trained splines 20th fixed.

Next to the first part of the shaft 18a has the rotor shaft 2 a second shaft part 18b on, the one with the first part of the shaft 18a is connected and axially / in the axial direction (ie along the axis of rotation 17th ) directly to this first part of the shaft 18a connects. This second part of the wave 18b has a helical toothing in this exemplary embodiment 21 on, by means of which gearing 21 the rotor shaft 2 is coupled with other output components during operation. The gearing 21 is axially spaced from the magnet unit 4th as well as to the stator 16 arranged.

It can also be seen that the magnet unit 4th on their two sides facing away axially from corresponding disk elements 5 , 22nd is surrounded in the form of balancing disks. One to the axial side of the second shaft part 18b disc element arranged towards it is the third disc element 22nd and implemented in this version as a balancing disc. This third disc element 22nd is directly on the spline 20th with fixed.

A first disc element 5 is on one of the second shaft part 18b axially facing away from the magnet unit 4th arranged and also implemented as a balancing disc.

How then especially good in connection with the 1 and 2 this first disc element can be seen 5 via a first tongue and groove connection 7a with the rotor shaft 2 tied together. The first tongue and groove connection 7a has on the part of the first disc element 5 a first nose protruding radially inward 8a as well as those on the part of the rotor shaft 2 introduced groove 9 on. The groove 9 is implemented as an axially extending groove and runs from one end of the spline 20th away in the axial direction. The groove 9 is to one of the splines 20th facing away from the axial side open. How in connection with 4th only a first nose is easy to see 8a to implement the first tongue and groove connection 7a available. The first nose 8a has a first width (measured in the circumferential direction).

Next to the first disc element 5 is another second disc element 6th by means of a second tongue and groove connection 7b with the rotor shaft 2 tied together. The second disc element 6th is implemented in this version as an encoder part / encoder wheel of a rotor position sensor. The second disc element 6th as then in connection with 5 can be clearly seen, accordingly has an outer contour designed for speed measurement and / or rotational position measurement 23 on, which in this case is designed like a rosette. The outer contour 23 thus points several in the circumferential direction uniformly formed and equally dimensioned elevations 24 on.

The second disc element 6th instructs to implement the second tongue and groove connection 7b a second nose 8b on. The second nose 8b has a second width (measured in the circumferential direction). That groove 9 the second tongue and groove connection 7b is the same groove 9 as with the first tongue and groove connection 7a . The two tongue and groove connections 7a , 7b thus have the same groove 9 on that into the rotor shaft 2 is introduced.

How in connection with the 2 and 3 to recognize points the groove 9 two different longitudinal regions 11a, 11b which differ from one another with regard to their width (measured in the circumferential direction). The width of a first longitudinal region 11a essentially corresponds to the (first) width of the first nose 8a , whereas the (measured in the circumferential direction) width of a second longitudinal area 11b essentially the (second) width of the second nose 8b is equivalent to. In this embodiment, the second width is the second nose 8b larger than the first width of the first nose 8a is. Hence, the width of the second nose is 8b greater than the width of the first longitudinal region 11a. In this context it should also be pointed out that in further explanations the noses 8a , 8b not only can be dimensioned differently in their width, but also have different shapes.

In connection with the 1 and 2 is also the axial fixation of the two disc elements 5 , 6th on the rotor shaft 2 to recognize. In this context it becomes clear that after an axial contact of the first disk element 5 on the magnet unit 4th this through an axial sleeve 12th is secured in its axial position. The axial sleeve 12th is calked on the rotor shaft 2 fixed. The axial sleeve 12th thus serves for direct contact / support on a first axial side 13a (/ of the magnet unit 4th axially remote side) of the first disc element 5 .

The second disc element 6th is with a second axial side 13b (/ of the magnet unit 4th axially facing side) on the axial sleeve 12th supported. This support takes place indirectly via a disc spring 14th that is axially compressible. This disc spring 14th is in such a way on the second disc element 6th that this axially against a locking ring 15th is pressed. The locking ring 15th is again in a typical manner in an annular groove 25th the rotor shaft 2 fixed.

In other words, the designs of the balancing disk according to the invention 5 as well as the stator 6th of the rotor position sensor with a driving tooth 8a , 8b these components can be connected by means of a keyway connection 7a , 7b can be secured easily and inexpensively. The components 5 , 6th preferably secured by different groove widths. In further versions, the same groove widths are alternatively provided.

The wave 2 is provided with a feather key connection during machining, which is designed in such a way that the components (balancing disc 5 and stator 6th of the rotor position sensor) and rotatory against twisting on the shaft 2 secures. The components 5 , 6th each have a driver tooth for this purpose 8a , 8b , which, depending on requirements, is identical or varies in shape. The axial securing of the components takes place independently of one another by separate elements, but can also be fixed dependent on one another by a single corresponding spring element.

In this case the axial sleeve 12th used the balancing disc 5 against the rotor package 4th and the second balancing disc 22nd to secure. The sleeve becomes axial 12th by a radial caulking on the shaft 2 fixed. The disc spring 14th is used to make the stator 6th of the rotor position sensor axially against the retaining ring 15th to press. The disc spring takes over 14th also at the same time the function of length compensation.

List of reference symbols

1

Rotor assembly

2

Rotor shaft

3

Outside

4th

Magnet unit

5

first disc element

6th

second disc element

7a

first tongue and groove connection

7b

second tongue and groove connection

8a

first nose

8b

second nose

9

Groove

10

electric machine

11 a

first longitudinal area

11b

second longitudinal area

12th

Axial sleeve

13a

first axial side

13b

second axial side

14th

Disc spring

15th

Circlip

16

stator

17th

Axis of rotation

18a

first shaft part

18b

second shaft part

19th

magnet

20th

Splines

21

Helical gearing

22nd

third disc element

23

Outer contour

24

Elevation

25th

Ring groove

Claims (9)

Rotor assembly (1) for an electrical machine (10) of a hybrid or purely electrically driven motor vehicle, with a rotor shaft (2), a magnet unit received on a radial outer side (3) of the rotor shaft (2) and connected to the rotor shaft (2) in a rotationally fixed manner (4) and at least two disk elements (5, 6) arranged axially next to the magnet unit (4), the disk elements (5, 6) each connected to the rotor shaft (2) in a rotationally fixed manner by means of a tongue and groove connection (7a, 7b) are. Rotor assembly (1) Claim 1 , characterized in that each disc element (5, 6) has a radially inwardly protruding nose (8a, 8b) of the tongue and groove connection (7a, 7b), which nose (8a, 8b) is in an axially extending groove ( 9) of the rotor shaft (2) is inserted. Rotor assembly (1) Claim 1 or 2 , characterized in that an axially extending groove (9) of the rotor shaft (2) has a first longitudinal region (11a) having a first width in which a radially inwardly projecting nose (8a) of a first disk element (5) is received and a second longitudinal region (11b) having a second width, in which a radially inwardly projecting nose (8b) of a second disk element (6) is received. Rotor assembly (1) according to one of the Claims 1 until 3 , characterized in that at least one of the disk elements (5, 6) is supported on at least one axial side (13a, 13b) by an axial sleeve (12) fixed on the rotor shaft (2). Rotor assembly (1) according to one of the Claims 1 until 4th , characterized in that a first disk element (5), which is fastened to the rotor shaft (2) by means of a first tongue and groove connection (7a), is designed as a balancing disk. Rotor assembly (1) Claim 5 , characterized in that the first disk element (5) is arranged axially between the magnet unit (4) and the axial sleeve (12). Rotor assembly (1) according to one of the Claims 1 until 6th , characterized in that a second disk element (6), which is fastened to the rotor shaft (2) by means of a second tongue and groove connection (7b), is designed as a transmitter part for a rotor position sensor. Rotor assembly (1) Claim 7 , characterized in that the second disc element (6) is axially pretensioned away from the axial sleeve (12) via a cup spring (14) and is pressed against a locking ring (15). Electric machine (10) for a hybrid or purely electrically driven motor vehicle, with a stator (16) and a rotor assembly (1) arranged radially inside the stator (16) and rotatable relative to the stator (16) according to one of the Claims 1 until 8th .

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