DE102021208080A1 - Enclosure for an electric machine with improved sealing - Google Patents

Abstract

A housing (8a, 8b) for an electrical machine (1, 1a) with an inner housing part (9a, 9b), an outer housing part (10a, 10b) and a cooling duct (12) located in between. The inner housing part (9a, 9b) has a flange (14) on a first end face (S1), which rests on a first sealing surface (D1) of the outer housing part (10a, 10b). A second end face (S2) of the housing inner part (9a, 9b) is opposite a second sealing surface (D2) of the housing outer part (10a, 10b). A sealing compound (15, 15') is provided between the flange (14) and the first sealing surface (D1) and between the second end face (S2) and the second sealing surface (D2). A manufacturing method for such a housing (8a, 8b), an electrical machine (1, 1a) with such a housing (8a, 8b) and a vehicle (17) with such an electrical machine (1, 1a) is also specified.

Description

TECHNICAL AREA

The invention relates to a housing for an electrical machine, a method for producing such a housing, an electrical machine with such a housing, and a vehicle with such an electrical machine.

STATE OF THE ART

Electric machines are increasingly being used in electrically powered vehicles and hybrid vehicles, primarily as electric motors for driving a wheel or an axle of such a vehicle.

Such an electric motor is usually mechanically coupled to a gear for speed adjustment. In addition, the electric motor is usually electrically coupled to an inverter, which generates an AC voltage for the operation of the electric motor, for example a polyphase AC voltage, from a DC voltage supplied by a battery.

It is also possible to operate an electric machine as a generator to recuperate kinetic energy from a vehicle. For this purpose, the kinetic energy is first converted into electrical energy and then into chemical energy from a vehicle battery.

In addition to a rotor and a stator, relative to which the rotor can be rotated, an electrical machine can be equipped with a housing in which the rotor and the stator are accommodated.

Such an electrical machine is often cooled with a heat transfer medium that flows through a cooling channel in the housing. If the housing is made up of several parts, a seal must be provided between the components so that the heat transfer medium is prevented from penetrating into the interior of the electrical machine and damage to the electrical machine is prevented as a result.

For example, the housing of the electrical machine can comprise a housing inner part and a radially outer housing part with the cooling channel in between, with the sealing taking place radially with annular seals (e.g. O-rings) and with the housing inner part being pushed into the housing outer part when the housing is assembled.

Apart from the fact that the production of such a housing is technically complex, because with such a solution the entire inner cylindrical surface of the housing outer part has to be finely machined and the sealing ring has to be provided with a lubricant for assembly, damage to the sealing ring cannot be ruled out. It is particularly problematic that such a seal is exposed to a shearing movement when the inner housing part is pushed into the outer housing part and can be easily damaged as a result or can be unscrewed from a retaining groove.

In some cases, such defects remain undetected, especially if they are invisible inside the electrical machine. Such a defect then usually only comes to light late, namely when the electrical machine is used. Under certain circumstances, this can result in very high damage if a device in which the electrical machine is installed cannot be operated.

However, not only the assembly of the housing is problematic, but also the preservation of the sealing effect over a longer period of operation of the electrical machine. In the case of sealing rings, it is often the case that the sealing seat is undermined by rust or general corrosion without any special design measures or without additional sealing with lubricating grease, thus destroying the sealing effect. This applies in particular to sealing seats that are exposed to environmental influences that promote corrosion, such as salt water, salty air or chemically active gases.

In summary, the known measures do not ensure process-reliable, fluid-tight sealing of the housing of the electrical machine.

DISCLOSURE OF THE INVENTION

It is therefore an object of the invention to specify an improved housing, an improved method for producing such a housing, an improved electrical machine with such a housing and an improved vehicle with such an electrical machine. In particular, a possibility for the process-reliable, fluid-tight sealing of the housing of the electrical machine is to be specified, and in particular the sealing effect is to be maintained over a long period of time.

• - Dabei weist der Gehäuseinnenteil auf einer ersten Stirnseite einen Flansch auf, der auf einer ersten Dichtfläche des Gehäuseaußenteils aufliegt, die quer zu einer für einen Rotor der elektrischen Maschine vorgesehenen Rotationsachse des Gehäuses ausgerichtet ist,
• - eine zweite Stirnseite des Gehäuseinnenteils liegt einer zweiten Dichtfläche des Gehäuseaußenteils gegenüber, die quer zu der Rotationsachse ausgerichtet ist, und
• - zwischen dem Flansch des Gehäuseinnenteils und der ersten Dichtfläche des Gehäuseaußenteils sowie zwischen der zweiten Stirnseite des Gehäuseinnenteils und der zweiten Dichtfläche des Gehäuseaußenteils ist eine Dichtmasse angeordnet.

The object of the invention is achieved by a housing for an electrical machine, which comprises a housing inner part and a radially outer housing outer part, wherein a cooling channel is arranged between the housing inner part and the housing outer part.

• - The inner part of the housing has a flange on a first end face, which rests on a first sealing surface of the outer part of the housing, which is aligned transversely to an axis of rotation of the housing provided for a rotor of the electrical machine,
• - A second end face of the housing inner part is opposite a second sealing surface of the housing outer part, which is aligned transversely to the axis of rotation, and
• A sealing compound is arranged between the flange of the inner housing part and the first sealing surface of the outer housing part and between the second end face of the inner housing part and the second sealing surface of the outer housing part.

1. a) Bereitstellen eines Gehäuseinnenteils und eines Gehäuseaußenteils des Gehäuses,
2. b) Auftragen einer Dichtmasse auf einen Flansch, welcher an einer ersten Stirnseite des Gehäuseinnenteils angeordnet ist, und/oder auf eine erste Dichtfläche des Gehäuseaußenteils, die quer zu einer für einen Rotor der elektrische Maschine vorgesehenen Rotationsachse des Gehäuses ausgerichtet ist,
3. c) Auftragen einer Dichtmasse auf eine zweite Stirnseite des Gehäuseinnenteils und/oder eine zweite Dichtfläche des Gehäuseaußenteils, die quer zu der Rotationsachse ausgerichtet ist, und
4. d) Einschieben des Gehäuseinnenteils in das Gehäuseaußenteil, so dass
   • - der Flansch des Gehäuseinnenteils an der ersten Dichtfläche des Gehäuseaußenteils anliegt und
   • - die zweite Stirnseite des Gehäuseinnenteils der zweiten Dichtfläche des Gehäuseaußenteils gegenüberliegt, wobei
   • - die in den Schritten b) und c) aufgetragene Dichtmasse verpresst wird.

In addition, the object of the invention is achieved by a method for producing a housing for an electrical machine, which has the following steps:

1. a) providing an inner housing part and an outer housing part of the housing,
2. b) application of a sealing compound to a flange, which is arranged on a first end face of the housing inner part, and/or to a first sealing surface of the housing outer part, which is aligned transversely to an axis of rotation of the housing provided for a rotor of the electrical machine,
3. c) application of a sealing compound to a second end face of the housing inner part and/or a second sealing surface of the housing outer part, which is aligned transversely to the axis of rotation, and
4. d) Sliding the inner part of the housing into the outer part of the housing so that
   • - the flange of the housing inner part rests against the first sealing surface of the housing outer part and
   • - Opposite the second end face of the housing inner part of the second sealing surface of the housing outer part, wherein
   • - the sealing compound applied in steps b) and c) is pressed.

• - ein Gehäuse der oben genannten Art,
• - einen im Gehäuse angeordneten Stator mit einem Statorblechpaket und an dem Statorblechpaket angeordneten Statorwicklungen und
• - einen im Stator angeordneten Rotor mit einer im Gehäuse um die Rotationsachse des Gehäuses drehbar gelagerten Rotorwelle.

Furthermore, the object of the invention is achieved by an electrical machine, comprising

• - a case of the type mentioned above,
• - A stator arranged in the housing with a stator lamination stack and stator windings arranged on the stator lamination stack and
• - A rotor arranged in the stator with a rotor shaft mounted in the housing so as to be rotatable about the axis of rotation of the housing.

In particular, the electrical machine can have connections for a cooling circuit, which are hydraulically connected to the cooling channel in the housing.

For example, the device in which the electrical machine is installed can provide such a cooling circuit.

Finally, the object is also achieved by a vehicle with a drive train that has an electric machine of the type mentioned above, which is provided for driving the vehicle. In particular, the vehicle also has a cooling circuit for connecting the electric machine.

Sealing surfaces aligned transversely to the axis of rotation of the rotor are advantageously provided for the sealing between the housing inner part and the housing outer part. In addition, instead of prefabricated seals, a sealing compound is used that can also be used to bridge and seal sealing gaps that have large tolerances.

For example, the sealing compound can consist of a silicone or have a silicone. Such materials have proven to be particularly suitable for the given application. In general, the sealing compound can consist of a viscous pasty mass. In particular, the sealing compound can be a commercially available FIP (Form In Place) seal.

Furthermore, the first and second sealing surfaces of the housing outer part and the associated sealing surfaces on the flange and on the second end face of the housing inner part can be aligned at right angles to the said axis of rotation of the housing. A shearing movement between the sealing surfaces mentioned can then be completely ruled out when the inner housing part is pushed into the outer housing part, as a result of which the pressing of the sealing compound is particularly successful.

In addition, a sealing seat sealed with a sealing compound cannot easily be undermined by corrosion, which means that the sealing effect is maintained over a long period of time. Accordingly, such an electrical machine is particularly suitable for use under difficult environmental conditions, for example in the form of salt water, salty air or chemically active gases.

Overall, the proposed measures can ensure process-reliable, fluid-tight sealing of the housing of the electrical machine. Penetration of the heat carrier into the interior of the electrical machine and associated damage to the electrical machine can be avoided in this way reliably and over a long period of time.

As an alternative to arranging the sealing compound between the flange of the inner housing part and the first sealing surface of the outer housing part and between the second end face of the inner housing part and the second sealing surface of the outer housing part, it is also possible to place the sealing compound only between the flange of the inner housing part and the first sealing surface of the outer housing part or only to be arranged between the second end face of the housing inner part and the second sealing surface of the housing outer part.

When the sealing compound is compressed, an axial pressure is applied to the sealing compound, so that the sealing compound is axially deformed. At the same time, the sealing compound can be pressed into the pores of the housing inner part and/or housing inner part, with which the sealing effect can be improved and the tendency to corrosion can be reduced.

Further advantageous refinements and developments of the invention result from the dependent claims and from the description in conjunction with the figures.

It is favorable if the flange of the housing inner part lies at least partially metallically on the first sealing surface of the housing outer part.

As a result, the inner part of the housing and the outer part of the housing can be brought into a predetermined position relative to one another during assembly of the housing.

It is also favorable if a gap, in which the sealing compound is located, is arranged between the second end face of the housing inner part and the second sealing surface of the housing outer part. In particular, a gap of 0.9 mm to 1.6 mm width can be provided. However, the gap can also be narrower. In this way, longitudinal tolerances or different thermal expansions of the inner part of the housing and the outer part of the housing can be compensated for (for example, if they are made of different materials).

Finally, it is advantageous if the pressing takes place by screwing the flange of the housing inner part to the housing outer part. As a result, the sealing compound can be pressed at the same time as the inner housing part is fastened to the outer housing part.

The above configurations and developments of the invention can be combined in any desired manner.

character list

• 1 eine schematisch im Halbschnitt dargestellte, beispielhafte elektrische Maschine mit einem mehrteiligen, gedichteten Gehäuse;
• 2 ein weiteres, beispielhaft dargestelltes Gehäuse in Schrägansicht;
• 3 das Gehäuse aus 2 im Halbschnitt;
• 4 eine Detailansicht einer ersten Gehäuseabdichtung;
• 5 eine Detailansicht einer zweiten Gehäuseabdichtung und
• 6 ein schematisch dargestelltes Kraftfahrzeug mit einer elektrischen Maschine der vorgeschlagenen Art.

Exemplary embodiments of the invention are shown in the accompanying schematic figures. Show it:

• 1 an exemplary electrical machine with a multi-part, sealed housing shown schematically in half section;
• 2 another case shown as an example in an oblique view;
• 3 the housing off 2 in half cut;
• 4 a detailed view of a first housing seal;
• 5 a detailed view of a second housing seal and
• 6 a motor vehicle shown schematically with an electric machine of the proposed type.

DETAILED DESCRIPTION OF THE INVENTION

As an introduction, it is stated that the same parts in the different embodiments are provided with the same reference numbers or the same component designations, possibly with different indices. The disclosures of a component contained in the description can be transferred analogously to another component with the same reference number or the same component designation. The position information selected in the description, such as "top", "bottom", "back", "front", "side" and so on, refers to the figure directly described and shown and, in the event of a change of position, to the new one transfer location.

1 shows a half section through a schematically illustrated electrical machine 1a. The electrical machine 1a comprises a rotor shaft 2 with a rotor 3 seated thereon, the rotor shaft 2 being rotatably mounted about an axis of rotation A relative to a stator 5 with the aid of (roller) bearings 4a, 4b. The rotor 3 has in particular rotor laminations, which are not shown individually, arranged one behind the other, as well as rotor magnets or a rotor winding. The stator 5 has a plurality of stator laminations 6 arranged one behind the other together form a stator lamination stack, as well as a stator winding 7 arranged on the stator lamination stack.

The electrical machine 1a further includes a housing 8a with a housing inner part 9a and a radially outer housing part 10a. in the in 1 example shown sits the first bearing 4a in the housing outer part 10a and the second bearing 4b in a bearing plate 11 which is connected to the housing inner part 9a. The end shield 11 can also be regarded as part of the housing 8a of the electrical machine 1a.

A cooling channel 12 is arranged between the inner housing part 9a and the outer housing part 10a, which runs between ribs 13 of the inner housing part 9a. The inner housing part 9a has a flange 14 on a first end face S1, which rests on a first sealing surface of the outer housing part 10a. A second end face S2 of the housing inner part 9a is opposite a second sealing surface of the housing outer part 10a. A sealing compound 15, 15' is arranged between the flange 14 of the housing inner part 9a and the first sealing surface of the housing outer part 10a and between the second end face S2 of the housing inner part 9a and the second sealing surface of the housing outer part 10a (for details regarding the seal see also the 4 and 5 ).

The 2 and 3 show a somewhat more detailed housing 8b, which in turn has a housing inner part 9b and a housing outer part 10b. The 2 shows the housing 8b in an oblique view, the 3 in longitudinal section. A cooling channel 12 is in turn arranged between the inner housing part 9b and the outer housing part 10b. From the 2 and 3 It can also be seen that the inner housing part 9b is screwed to the outer housing part 10b with the aid of screws 16.

The 4 now shows a detail Y of the seal on the first end face S1 of the housing inner part 9b. This clearly shows that the flange 14 of the inner housing part 9b rests on a first sealing surface D1 of the outer housing part 10b, which is aligned transversely to the axis of rotation A of the housing 8b provided for the rotor 3 of the electric machine 1a. A sealing compound 15 is arranged between the flange 14 of the housing inner part 9b and the first sealing surface D1 of the housing outer part 10b.

The 5 shows a detail Z of the seal on the second end face S2 of the housing inner part 9b. From this it can be clearly seen that the second end face S2 of the housing inner part 9b is opposite a second sealing surface D2 of the housing outer part 10b, which is aligned transversely to the axis of rotation A. A sealing compound 15' is also arranged between the second end face S2 of the housing inner part 9b and the second sealing surface D2 of the housing outer part 10b.

Advantageously, the proposed measures can be used to design the cooling channel 12 to be liquid-tight and gas-tight, so that no cooling fluid can penetrate from the cooling channel 12 into the interior of the electrical machine 1a and damage it during later operation of the electrical machine 1a.

1. a) Bereitstellen eines Gehäuseinnenteils 9a, 9b und eines Gehäuseaußenteils 10a, 10b des Gehäuses 8a, 8b,
2. b) Auftragen einer Dichtmasse 15 auf einen Flansch 14, welcher an einer ersten Stirnseite S1 des Gehäuseinnenteils 9a, 9b angeordnet ist, und/oder auf eine erste Dichtfläche D1 des Gehäuseaußenteils 10a, 10b,
3. c) Auftragen einer Dichtmasse 15' auf eine zweite Stirnseite S2 des Gehäuseinnenteils 9a, 9b und/oder eine zweite Dichtfläche D2 des Gehäuseaußenteils 10a, 10b und
4. d) Einschieben des Gehäuseinnenteils 9a, 9b in das Gehäuseaußenteil 10a, 10b, so dass
   • - der Flansch 14 des Gehäuseinnenteils 9a, 9b an der ersten Dichtfläche D1 des Gehäuseaußenteils 10a, 10b anliegt und
   • - die zweite Stirnseite S2 des Gehäuseinnenteils 9a, 9b der zweiten Dichtfläche D2 des Gehäuseaußenteils 10a, 10b gegenüberliegt, wobei
   • - die in den Schritten b) und c) aufgetragene Dichtmasse 15, 15' verpresst wird.

A method for producing a housing 8a, 8b for an electrical machine 1a thus comprises the following steps:

1. a) providing an inner housing part 9a, 9b and an outer housing part 10a, 10b of the housing 8a, 8b,
2. b) application of a sealing compound 15 to a flange 14, which is arranged on a first end face S1 of the housing inner part 9a, 9b, and/or on a first sealing surface D1 of the housing outer part 10a, 10b,
3. c) Application of a sealing compound 15' to a second end face S2 of the housing inner part 9a, 9b and/or a second sealing surface D2 of the housing outer part 10a, 10b and
4. d) Insertion of the inner housing part 9a, 9b in the outer housing part 10a, 10b, so that
   • - The flange 14 of the housing inner part 9a, 9b rests against the first sealing surface D1 of the housing outer part 10a, 10b and
   • - The second end face S2 of the housing inner part 9a, 9b of the second sealing surface D2 of the housing outer part 10a, 10b is opposite, wherein
   • - The sealing compound 15, 15' applied in steps b) and c) is pressed.

In particular, the pressing can take place by screwing the flange 14 of the housing inner part 9a, 9b to the housing outer part 10a, 10b, for example by tightening the screws 16.

In an advantageous embodiment of the housing 8a, 8b, the flange 14 of the housing inner part 9a, 9b rests at least partially metallically on the first sealing surface D1 of the housing outer part 10a, 10b, whereby the housing inner part 9a, 9b and the housing outer part 10a, 10b during assembly of the housing 8a, 8b can be brought into a predetermined position relative to one another. In addition, there is preferably a gap between the second end face S2 of the housing inner part 9a, 9b and the second sealing surface D2 of the housing outer part 10a, 10b, in which the sealing compound 15' is located. The width b of the gap is between 0.9 mm and 1.6 mm, for example, but can also be smaller be. In this way, longitudinal tolerances or different thermal expansions of the housing inner part 9a, 9b and the housing outer part 10a, 10b can be compensated

In general, the sealing compound 15, 15' can consist of a viscous pasty mass. For example, the sealing compound 15, 15' can consist of a silicone or have a silicone. Such materials have proven to be particularly suitable for the given application. In particular, the sealing compound 15, 15' can be a commercially available FIP (Form In Place) seal.

In the examples shown, the rib 13 or the cooling channel 12 run in a wide circumferential area along circles around the axis of rotation A. The course of the rib 13 or the cooling channel 12 only has an axial component in a narrow circumferential area. However, it would also be conceivable for the rib 13 and the cooling channel 12 to run along a helical line with a constant pitch. Furthermore, a plurality of coolant channels 12 through which the coolant flows in parallel can also be provided, which, for example, emanate from a first collector and open into a second collector. In particular, the ribs 13 and coolant channels 12 can then also run in the axial direction. It would also be conceivable for ribs 13 to be formed alternatively or additionally on the outer housing part 10a, 10b.

In an operational arrangement (for example in a vehicle), the cooling duct 12 is hydraulically integrated into a cooling circuit which can for example comprise a pump and a cooler. For this purpose, the electrical machine 1a can have connections for the cooling circuit, which are hydraulically connected to the cooling channel 12 in the housing 8a, 8b. For example, water (especially water mixed with antifreeze) or oil can act as a heat transfer medium in the cooling circuit. However, it would also be conceivable for a gaseous heat carrier to circulate in the cooling circuit.

At this point it is also noted that the electric machine 1a can not only be cooled with the proposed measures, but can of course also be heated. For example, the electrical machine 1a can be preheated at low outside temperatures.

The 6 finally shows the electric machine 1 installed in a vehicle 17. The vehicle 17 has two axles, one of which is driven. Specifically, the electric machine 1 is connected to the semi-axles 19 of the rear axle via an optional transmission 18 . Finally, the driven wheels 20 are mounted on the semi-axles 19 . The electric machine 1, the transmission 18 and the semi-axles 19 are part of the drive train of the vehicle 17. The vehicle 17 is driven at least partially or temporarily by the electric machine 1. This means that the electric machine 1 can be used to drive the vehicle alone 17 serve or be provided, for example, in combination with an internal combustion engine (hybrid drive).

Finally, it is stated that the scope of protection is determined by the patent claims. However, the description and drawings should be used to interpret the claims. The features contained in the figures can be arbitrarily exchanged and combined with one another. In particular, it is also stated that the devices shown can also include more or fewer components than shown. In some cases, the devices shown or their components may also not be shown to scale and/or enlarged and/or reduced.

Reference List

1, 1a

electric machine

2

rotor shaft

3

rotor

4a, 4b

(Roller bearing

5

stator

6

stator lamination

7

stator winding

8a, 8b

Housing

9a, 9b

housing inner part

10a, 10b

housing outer part

11

bearing shield

12

cooling channel

13

rib

14

flange

15, 15'

sealant

16

screw

17

vehicle

18

transmission

19

semi-axis

20

wheel

A

axis of rotation

b

gap width

D1

first sealing surface of the housing outer part

D2

second sealing surface of the housing outer part

S1

first end face of the housing inner part

S2

second end face of the housing inner part

Claims (9)

Housing (8a, 8b) for an electrical machine (1, 1a), comprising a housing inner part (9a, 9b) and a radially outer housing part (10a, 10b), wherein between the housing inner part (9a, 9b) and the housing outer part (10a, 10b) a cooling duct (12) is arranged, characterized in that - the inner housing part (9a, 9b) has a flange (14) on a first end face (S1) which is on a first sealing surface (D1) of the outer housing part (10a, 10b ) rests, which is aligned transversely to an axis of rotation (A) of the housing (8a, 8b) provided for a rotor (3) of the electrical machine (1, 1a), - a second end face (S2) of the housing inner part (9a, 9b) opposite a second sealing surface (D2) of the outer housing part (10a, 10b), which is aligned transversely to the axis of rotation (A), and - between the flange (14) of the inner housing part (9a, 9b) and the first sealing surface (D1) of the outer housing part (10a, 10b) and between the second end face (S2) of the housing A sealing compound (15, 15') is arranged between the inner part (9a, 9b) and the second sealing surface (D2) of the housing outer part (10a, 10b). Housing (8a, 8b) after claim 1 , characterized in that the flange (14) of the housing inner part (9a, 9b) rests at least partially metallically on the first sealing surface (D1) of the housing outer part (10a, 10b). Housing (8a, 8b) after claim 1 or 2 , characterized in that a gap is arranged between the second end face (S2) of the housing inner part (9a, 9b) and the second sealing surface (D2) of the housing outer part (10a, 10b), in which the sealing compound (15') is located. Housing (8a, 8b) according to one of Claims 1 until 3 , characterized in that the sealing compound (15, 15 ') consists of a silicone or has a silicone. Electrical machine (1, 1a), comprising - a housing (8a, 8b) according to one of Claims 1 until 4 - a stator (5) arranged in the housing (8a, 8b) with a stator core and stator windings (7) arranged on the stator core and - a rotor (3) arranged in the stator (5) with a housing (8a, 8b) around the axis of rotation (A) of the housing (8a, 8b) rotatably mounted rotor shaft (2). Electrical machine (1, 1a) after claim 5 , characterized by connections for a cooling circuit which are hydraulically connected to the cooling channel (12) in the housing (8a, 8b). Vehicle (17) with a drive train, which has an electric machine (1, 1a). claim 5 or 6 has, which is provided for driving the vehicle (17). Method for producing a housing (8a, 8b) for an electrical machine (1, 1a), comprising the steps a) providing an inner housing part (9a, 9b) and an outer housing part (10a, 10b) of the housing (8a, 8b), b) Application of a sealing compound (15) to a flange (14) which is arranged on a first end face (S1) of the housing inner part (9a, 9b) and/or on a first sealing surface (D1) of the housing outer part (10a, 10b) which is aligned transversely to an axis of rotation (A) of the housing (8a, 8b) provided for a rotor (3) of the electrical machines (1, 1a), c) Application of a sealing compound (15') to a second end face (S2) of the inner housing part (9a, 9b) and/or a second sealing surface (D2) of the outer housing part (10a, 10b), which is aligned transversely to the axis of rotation (A). , and d) sliding the inner housing part (9a, 9b) into the outer housing part (10a, 10b) so that - the flange (14) of the housing inner part (9a, 9b) rests against the first sealing surface (D1) of the housing outer part (10a, 10b) and - The second end face (S2) of the housing inner part (9a, 9b) of the second sealing surface (D2) of the housing outer part (10a, 10b) is opposite, wherein - the sealing compound (15, 15') applied in steps b) and c) is pressed. procedure after claim 8 , characterized in that the pressing takes place by screwing the flange (14) of the housing inner part (9a, 9b) to the housing outer part (10a, 10b).

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