Electric motor of a motor vehicle

Abstract

The invention relates to an electric motor (1) having a housing (3) with a partition wall (22) between an electronics compartment (24) and a motor compartment (23) for accommodating a stator (4) having a stator winding (5) and a rotor (12) fixed on a motor shaft (13) relative to the shaft, the partition wall (22) has a central shaft opening or bearing opening (26) for the motor shaft (13) and a number of cutouts (25) for phase connections (11) for electrically contacting the stator winding (5) with the electronics (32), and wherein a cover element (20) is arranged in the electronics compartment (24) across the partition wall (22), the cover element has a through-opening (31) for the phase contact (11) corresponding to the cutout (25) of the partition wall (22).

Description

Field of the Invention

[0001] The invention relates to an electric motor for a motor vehicle, in particular a steering motor. The electric motor has a housing which has a partition wall between an electronics compartment and a motor compartment for a stator and a rotor. The partition wall has a certain number of notches for phase connectors. Such an electric motor is known, for example, from DE 10 2020 214 597 A1. Background Art

[0002] In motor vehicles, a large number of electric motor-driven adjustment drives, such as window lifter drives or seat adjustment drives, are usually provided in order to move the corresponding adjustment parts. In order to simplify the steering movement in these motor vehicles, an electric steering unit (servo steering unit) is used, for example. Here, an electric motor (steering motor) usually acts on a steering assembly that rotates during steering. By means of this steering assembly, a rack is laterally driven, and the rack is in turn coupled to the wheels of the motor vehicle that are to move during steering. By appropriately controlling the electric motor, an undesired steering angle can also be avoided. For this purpose, for example, the angular movement of the steering wheel of the motor vehicle is monitored.

[0003] The electric motor can be designed as a brushed or brushless DC motor (BLDC). For this purpose, the electric motor has electrically interconnected coils which are energized by means of electronics. When individual coils are short-circuited, for example, due to accidental contact with a conductive component, it may cause the electric motor to jam, making it impossible or at least difficult to steer the motor vehicle. To avoid this, the individual components of the electric motor are usually arranged in a relatively robust common (motor) housing. Usually, metal is used as the material for the housing.

[0004] Due to the (manufacturing) tolerances of the individual motor components and / or their relatively large distances from each other and in order to avoid impairing the function of the electric motor, a correspondingly large structural space is provided within the housing, which is often undesirable, for example, due to the space requirements of the electric motor thereby. In addition, the individual components of the (motor) electronics also need to be protected against particulate matter in order to avoid impairment of the function of the electronics.

[0005] Therefore, when there is poor sealing and particles migrate from the motor side to the electronic device, there is a risk of short circuit in the electronic device. This risk, which occurs, for example, due to tolerances and reduced distances between the individual components, is increased by the fact that, as a commonly used technology in the automotive industry, the electronic device or controller is in contact with the motor via an insulation piercing connector or contact part. Here, the coil or phase connector is typically led directly from the stator winding, which is preferably constructed from interconnected coils, to the corresponding mating contact part of the electronic device without any particle and / or moisture protection. Summary of the Invention

[0006] The object of the present invention is to provide an electric motor for a motor vehicle that is particularly suitable, wherein in particular short circuits in the (motor) electronic device are to be avoided.

[0007] This object is solved according to the invention by means of the features of claim 1. Advantageous refinements and designs are the subject matter of the dependent claims.

[0008] To this end, the electric motor has a housing that is in particular hollow cylindrical, which has a partition wall between the electronic device compartment and the motor compartment and in particular a covering element for protecting against particles and / or moisture for the (motor) electronic device. The motor compartment of the housing is used to accommodate a stator with a stator winding and a rotor that is arranged on the motor shaft either fixed relative to the shaft or against relative rotation. The partition wall has a central bearing opening for the motor shaft and a certain number of notches for phase connectors for making electrical contact between the stator winding and the electronic device. The covering element, which is arranged in the electronic device compartment in a suitable manner, spans across the partition wall, or preferably completely covers or fully covers the partition wall. The covering element has through openings for the phase connectors that correspond to the notches on the partition wall. In an advantageous design, a sealing element that at least partially surrounds the phase connector is provided in the through openings of the covering element.

[0009] Particularly preferably, the electric motor is designed to be brushless and is preferably a brushless DC motor (BLDC). Suitably, the electric motor is part of an auxiliary unit (such as an adjustment drive) of a motor vehicle. The adjustment drive includes an adjustment part that is driven along an adjustment path during operation by means of the electric motor. Particularly preferably, the electric motor is used as a steering drive (steering motor) for a motor vehicle. The adjustment part is in particular a steering assembly by means of which the rack is driven. Alternatively, the adjustment part is the rack itself by means of which at least one wheel of the motor vehicle is pivoted about a substantially vertical axis.

[0010] The present invention is based on the consideration that if the distance errors and / or movements and / or (manufacturing) tolerances between the individual motor components or electronic device components are compensated for by means of a mechanical interface between the electronic device and the remaining motor components, the risk of a short circuit occurring in the electronic device of a brushless electronically commutated electric motor can be minimized as much as possible. The mechanical interface should be as sealed as possible against particles and / or moisture.

[0011] The mechanical interface should have components made of a relatively hard material, in particular for establishing a firm seating within the housing, and components made of a relatively soft material, preferably for sealing the electronic device relative to the motor components and / or for compensating for tolerances and movements caused, for example, by temperature fluctuations or by mechanical movement or shock, especially on the existing sealing surfaces.

[0012] The mechanical interface in the form of a covering element is suitably embodied as a covering within the electronic device compartment of the housing, which covering prevents (leakage) contamination on the side of the electronic components. The covering element should preferably be a plastic covering having a sealing effect, in particular relative to the motor compartment and suitably also having a sealing effect at the phase joints, in order to avoid as reliably as possible the ingress of foreign particles, liquids and / or lubricating oil into the electronic device compartment of the housing.

[0013] By means of the covering element, the functional safety of existing rotor position sensors or encoders (such as an annular magnet connected to the motor shaft), for example, should also be ensured. In addition, the covering element should also serve the purpose of providing as reliable or at least sufficient stability as possible for the contact parts or lead frames, which contact parts or lead frames are guided from the motor-side or stator-side coupling units, for example, via openings, holes or through-passes in the partition wall of the housing to the existing contact parts, in particular insulation-piercing contact parts, of the electronic device (controller).

[0014] In an advantageous design, the covering element has a disc-shaped base body and a cap edge serving as a sealing ring. The cap edge is especially composed of an elastic plastic (elastomer). The base body is especially composed of a relatively hard plastic. Particularly preferably, the covering element is a one-piece (integral) two-component member (2K plastic member) made of two plastics of different hardnesses.

[0015] Suitably, the covering element, which is suitably circular, fits closely against the inner wall of the housing.

[0016] According to a suitable refinement, at least partially surrounding the phase joints, sealing elements are provided in the through-openings of the covering element. Preferably, these sealing elements are connected to the cap edge of the covering element via especially radial sealing joints.

[0017] In a particularly advantageous design, the covering element is provided and configured to receive and / or cover a signal transmitter, in particular a ring magnet. For this purpose, the covering element has an axially raised cap region to form a receiving space for the signal transmitter. A signal transmitter fixed relative to the shaft, which is suitably arranged at the shaft end, cooperates, for example, with a Hall sensor of the (motor) electronics to detect the rotational speed of the motor shaft and / or to identify the direction of rotation or the position. In particular, in the case of a steering motor, the angular movement of the steering wheel of a motor vehicle can thus be reliably monitored.

[0018] Suitably, the covering element has an axially raised cap section. The cap section covers an annular receiving space provided in the partition wall of the housing. The receiving space annularly surrounds the bearing opening of the partition wall and receives a spring washer that cooperates with the shaft bearing, in particular with the inner and / or outer ring of a ball bearing. In a design in which the covering element has a cap region configured to receive or cover a signal transmitter, the diameter of the cap region is smaller than the diameter of the cap section of the covering element that covers the spring washer and encloses the annular receiving space of the partition wall. In this design of the covering element, the covering element preferably has a two-step cap section in the center.

[0019] Suitably, radially oriented support ribs, centering ribs, and / or positioning ribs are formed on the inner side (inner wall side) of the annular wall of the annular cap section of the covering element. By means of these ribs, a firm placement of the covering element on the partition wall and thus a firm placement in the housing are ensured. In order to preferably additionally stabilize the covering element or to increase the stiffness of the covering element, the covering element suitably has a certain number of support ribs and / or stabilizing ribs, in particular radially oriented or extending, on the outer side of the cap.

[0020] In an advantageous refinement, a separating element, in particular a film-like one, is arranged between the partition wall and the stator. In particular, the separating element is arranged parallel to the housing wall. By means of the separating element, the notch and the housing wall are each at least partially covered. Thus, an additional component is present between the stator and the electronics, and by means of the separating element, the size or diameter or clear width of the notch is reduced. Thus, it has become difficult for particles and / or liquid (lubricating oil) to pass between the motor compartment and the electronics compartment. Such contamination can occur, for example, due to abrasion of components of the electric motor arranged in the motor compartment, or may also occur after manufacturing (motor assembly).

[0021] The advantages achieved by using the present invention lie particularly in that, by means of a covering element as a mechanical interface in the housing of an electric motor, short circuits due to particles and liquids on the circuit board of the electronics of the electric motor are avoided in a particularly inexpensive manner and without significantly increasing the mass of the motor structural components. In addition, matching of different tolerances can be achieved in a reliable or effective manner and method without impairing the functions of the motor components and / or the electronics components. In addition, by omitting the bearing housing covering of the spring washer for bearing preloading or bearing adjustment and by using the covering element as a bearing covering or also as a bearing end cap, a cost reduction in terms of the housing of the electric motor can be achieved. In addition, in addition to or due to the reduction of the short circuit risk, the likelihood of failure of the electronics system of the electric motor is advantageously reduced. Description of the Drawings

[0022] The embodiments of the present invention will be explained in detail below with reference to the drawings. Among them:

[0023] Figure 1 A sectional view shows an exploded view of an electric motor having a housing for accommodating motor structural components and electronics as well as an electronics-side covering element;

[0024] Figure 2 A longitudinal sectional view of the housing is shown, the housing having a partition wall between the motor compartment and the electronics compartment and a covering element on the partition wall;

[0025] Figure 3 A longitudinal sectional view of the housing is shown, the housing having a motor-side switching unit (interlink ring) and an electronics-side covering element as well as a motor shaft of the electric motor supported in the partition wall and the bearing end cap;

[0026] Figure 4a and 4b Perspective views of the covering element are shown in top and bottom views;

[0027] Figure 5 A longitudinal sectional view of a region of the partition wall spanned by the covering element in the electronics compartment of the housing of the electric motor is shown in section; and

[0028] Figure 6 An electric steering part of a motor vehicle having an electric motor is shown.

[0029] Corresponding parts are provided with the same reference numerals in all the figures. Detailed Description of the Embodiment

[0030] Figure 1 An exploded view of the electric motor 1 is shown, in which the individual components are pulled apart from each other along the longitudinal axis 2. Descriptions such as axial or radial are related to Figure 1relates to the axial direction A parallel to the longitudinal axis 2 shown therein or to Figure 1 the radial direction R transverse to the longitudinal axis 2 shown therein.

[0031] The electric motor 1 has a housing 3 which is preferably made of aluminum, for example by die-casting or cold extrusion. The housing 3 is preferably designed to have a (positive) circular base or cross-section in the shape of a hollow cylinder, wherein the axis of the cylinder coincides with the longitudinal axis.

[0032] The (brushless) electric motor 1 also has a stator 4 which has a stator winding (rotating field winding) 5. The stator winding is formed by coils 6 which are arranged on the radially inwardly directed stator teeth 7 of a stator core 8 which is implemented, for example, as a stack of plates, and which are interconnected, for example in a triangular circuit, to form phases by means of an interlinking ring formed by conductive rails 9 ( Figure 3 and Figure 5 ). The coil ends of the stator winding 5 are led into phase connectors 11 which are preferably formed by conductive rail contacts and which are expediently oriented axially or parallel to the longitudinal axis 2.

[0033] Furthermore, the electric motor 1 also has a rotor 12 which is arranged non-rotatably relative to or is fixedly connected to the motor shaft 13 in an axially fixed manner. The rotor 12 surrounded by the stator 4 preferably has a plurality of permanent magnets 14 on the circumferential side. The motor shaft 13 is supported in the housing 3 by means of a bearing 15 (in particular a ball bearing) on the A side and in a bearing end cover 17 by means of a bearing 16 (in particular a ball bearing) on the B side. The preferably cap-shaped bearing end cover 17 is arranged on the housing 3 at the end side on the A side of the housing in the assembled state ( Figure 3 ). The (ball) bearing 16 on the B side is mechanically preloaded or adjusted by means of a (claw-shaped) spring washer 18. A signal transmitter 19 in the form of an annular magnet is used to determine the speed, the direction of rotation and / or the rotational position of the rotor 12. The electric motor 1 also has a covering element 20 which can preferably be inserted into the housing 3 from the B side of the housing. A driven element 21, for example a pinion or a pulley, is arranged on the motor shaft 13 on the A side.

[0034] Figure 2A longitudinal sectional view along the longitudinal axis 2 of the housing 3 of the electric motor 1 is shown. The housing 3 has, on the inner side of the housing, a partition wall 22 arranged perpendicular to the longitudinal axis 2, which is arranged integrally within the housing and within the hollow cylindrical housing 3. The partition wall 22 is arranged between the two end sides of the hollow cylindrical housing 3, thereby forming a motor compartment 23 and an electronic device compartment 24, which are separated from each other by the partition wall 22. The partition wall 22 between the motor compartment 23 and the electronic device compartment 24 has a notch 25 with a circular cross-section in the embodiment, which is radially offset relative to the longitudinal axis 2. A void, which is an axis or bearing opening 26, is introduced into the partition wall 22 centrally relative to the longitudinal axis 2, and this void is delimited or surrounded by a wall portion 27 that is concentric with the longitudinal axis 2 and axially extends into the motor compartment 23. In the electronic device compartment 24, a covering element 20 is sleeved onto the partition wall 22, and the covering element 20 spans across the partition wall 22 and closely abuts against the inner wall 28 of the housing 3.

[0035] Figure 3 The housing 3 is shown, which has: an assembled (side A) bearing end cap 17; and a motor shaft 13 rotatably supported; and a covering element 20 sleeved onto the partition wall 22 on the electronic device compartment side; and a switching unit 10 arranged on the motor compartment side. The shaft section or journal of the motor shaft 13 is guided into the electronic device compartment 24 via the shaft opening or bearing opening 26. There, a signal transmitter 19 is connected to the motor shaft 13 relative to the shaft fixedly or anti-rotationally via a connecting element 29, and the connecting element is placed in the axial plug opening or engagement opening 30 of the motor shaft 13 ( Figure 5 ). It can be seen that the phase connection head 11 extends into the electronic device compartment 24 via a through-opening 31 provided in the covering element 20.

[0036] As combined with Figure 2 It can be seen that the through-opening 31 of the covering element 20 corresponds to or is aligned with the notch 25 of the partition wall 22. The (motor) electronic device 32 is accommodated in the electronic device compartment 24, and Figure 3 the circuit board of this electronic device is shown, which has a mating contact portion 33 for one of the phase contact portions or phase connection heads 11 of the switching unit 10. The mating contact portion 33 is preferably implemented as an insulation-piercing contact portion.

[0037] Figure 4a and Figure 4b The covering element 20 is shown in different perspective views. The covering element 20 is placed into the electronic device compartment 24 of the housing 3 so as to span across the partition wall 22 there and to cover it completely or comprehensively. It can be seen that the through-opening 31 of the covering element 20 corresponds to the notch 25 provided in the partition wall 22 for the phase connection head 11.

[0038] The covering element 20 has a base body 34 with a disk-shaped or circular cross-section and a cap edge 35 serving as a sealing ring or sealing lip. The cap edge is made of an elastic plastic (elastomer). The base body 34 is made of a relatively hard plastic. The covering element 20 is a two-component part (2K plastic part) made of two plastics with different hardnesses. The covering element 20 tightly abuts against the inner wall 28 of the housing 3 by means of the surrounding, elastic cap edge 35. A sealing element 36 is also provided in the through-opening 31 of the covering element 20, which is preferably fully surrounded by the through-opening 31 formed on the base body 34 of the phase joint 11. The sealing element is connected to the cap edge 35 of the covering element 20 via radial (sealing) joints 37, and these radial (sealing) joints 37 are formed of the same material as the cap edge 35 and the sealing element 36.

[0039] The covering element 20 is provided for receiving and covering the signal transmitter 19 on the shaft end side. For this purpose, the covering element 20 has an axially raised cap region 38 to form a receiving space 39 for the signal transmitter 19. The signal transmitter 19 arranged fixedly relative to the shaft at the shaft end of the motor shaft 13 interacts with the sensor of the (motor) electronics 32 in a manner and method not shown in detail for speed detection and / or rotation direction identification or position identification of the motor shaft 13.

[0040] The covering element 20 has an axially raised cap section 40 that covers an annular receiving space 41 provided in the partition wall 22 of the housing 3, and the annular receiving space is surrounded by an axially raised wall portion 41a extending into the electronics compartment 24. The axially raised wall portion or the annular receiving space 41 annularly surrounds the bearing opening 26 of the partition wall 22 and houses the spring washer 18 for the bearing 15 on the B side.

[0041] It can be seen that the diameter or net width of the receiving space 41 of the cap section 40 is greater than the diameter or net width of the receiving space 39 of the cap region 38 of the covering element 20 and less than the diameter of the base body 34 of the covering element 20. Appropriately, the diameter of the receiving space 41 or the cap section 40 is approximately (48 ± 3)% of the diameter of the base body 34. The diameter of the receiving space 39 or the cap region 38 is suitably approximately (22 ± 3)% of the diameter of the base body 34.

[0042] In the cap section 40 of the covering element 20, radially inwardly directed ribs 43 are formed on the inner wall side of the annular wall 42. These ribs enable centering of the covering element 20 and cause the covering element 20 to be firmly seated on the partition wall 20 and thus firmly seated in the housing 3. For stabilizing the covering element 20 or for increasing the stiffness of the covering element, the covering element 20 has a plurality of radially oriented stabilizing ribs 44 on the outside. Vent holes 45 are introduced into the base body 34 of the covering element 20 and are covered on the inside with a diaphragm 46 that is especially breathable or vapor-permeable.

[0043] Figure 5 The electric motor 1 is shown in the region of the partition wall 22 located in the electronic component compartment 24. The partition wall has a covering element 20 arranged thereon. The switching unit 10 can be seen, which has a conductive rail 9 and phase connectors 11 that pass through the partition wall 22 and the covering element 20 and extend into the electronic component compartment 24. A film-like separating element 47 is arranged on the side of the partition wall 22 facing the stator 4 or the switching unit 10. The separating element at least partially covers the notch 25 in the partition wall 22 and the partition wall. The size of the notch 25 is reduced by the separating element 47, thereby making it more difficult for particles and / or liquid (lubricating oil) to pass between the motor compartment 23 and the electronic component compartment 24.

[0044] Figure 6 The adjusting drive device 48 in the form of an electric steering unit (servo steering unit) of a motor vehicle 49 is schematically and simplifiedly shown. The motor vehicle 49 includes a steering wheel 50, which is coupled to a rack 52 via a pinion 53 by means of a steering rod 51. The rack 52 is coupled to the front wheels 54, and when the steering wheel 50 is turned, the front wheels should pivot about an axis 55 extending substantially vertically. The steering rod 51 is two-piece, and the two parts are connected to each other by means of a rod 56.

[0045] A first sensor 57 is assigned to the part of the steering rod 51 located between the rod 56 and the steering wheel 50, and a second sensor 58 is assigned to the part of the steering rod 52 located between the pinion 53 and the rod 56. These sensors are connected to a control unit 59 in terms of signal technology. An electric motor 1 is assigned to the part of the steering rod 51 located between the pinion 53 and the rod 56, and the electric motor is controlled by means of the control unit 59. Here, the angular deviation between the two parts of the steering rod 51 is detected by means of the two sensors 58, 59, and thus the desired steering angle of the front wheels 54 is obtained. If necessary, the electric motor 1 is energized to support the rotational movement of the steering rod 51.

[0046] In summary, the present invention relates to an electric motor 1 having a housing 3, the housing having a partition wall 22 between an electronic component compartment 24 and a motor compartment 23, wherein the partition wall 22 has a certain number of notches 25 for electrically contacting the stator winding 5 with the electronic components 32, and wherein a covering element 20 spanning the partition wall 22 is arranged in the electronic component compartment 24, the covering element having through openings 31 corresponding to the notches 25 of the partition wall 22 for the phase connectors 11.

[0047] The present invention is not limited to the above embodiments. On the contrary, those skilled in the art can also derive other variants of the present invention without departing from the subject matter of the present invention. In particular, all the individual features described in connection with the respective embodiments can also be combined with each other in other ways without departing from the subject matter of the present invention.

[0048] List of reference numerals

[0049] 1 Electric motor

[0050] 2 Longitudinal axis

[0051] 3 Housing

[0052] 4 Stator

[0053] 5 Stator winding / rotating field winding

[0054] 6 Coil

[0055] 7 Stator tooth

[0056] 8 Stator core

[0057] 9 Conductive rail

[0058] 10 Switching unit / interlink

[0059] 11 Phase connection

[0060] 12 Rotor

[0061] 13 Motor shaft

[0062] 14 Permanent magnet

[0063] 15 Bearing (on side A)

[0064] 16 Bearing (on side B)

[0065] 17 Bearing cover

[0066] 18 Claw washer / spring washer

[0067] 19 Signal transmitter / ring magnet

[0068] 20 Cover element

[0069] 21 Driven element

[0070] 22 Partition wall

[0071] 23 Motor compartment

[0072] 24 Electronics compartment

[0073] 25 Notch

[0074] 26 Cutout / shaft opening / bearing opening

[0075] 27 Wall part

[0076] 28 Inner wall

[0077] 29 Connecting element

[0078] 30 Plug opening / engagement opening

[0079] 31 Through-opening

[0080] 32 Motor electronics / Electronics

[0081] 33 Fitting contact part

[0082] 34 Substrate

[0083] 35 Cap edge

[0084] 36 Sealing element

[0085] 37 Sealing joint / Joint

[0086] 38 Cap area

[0087] 39 Receiving space

[0088] 40 Cap section

[0089] 41 Receiving space

[0090] 41a Wall part

[0091] 42 Annular wall

[0092] 43 Rib

[0093] 44 Stabilizing rib

[0094] 45 Vent hole

[0095] 46 Diaphragm

[0096] 47 Partitioning element

[0097] 48 Adjusting drive

[0098] 49 Motor vehicle

[0099] 50 Steering wheel

[0100] 51 Steering rod

[0101] 52 Rack

[0102] 53 Pinion

[0103] 54 Front wheel

[0104] 55 Axis

[0105] 56 bar

[0106] 57 First sensor

[0107] 58 Second sensor

[0108] 59 Control unit

[0109] A Axial direction

[0110] R Radial direction

Claims

1. Electric motor (1) for a motor vehicle (49), in particular a steering motor, having a housing (3) with a partition wall (22) between an electronics compartment (24) and a motor compartment (23), the motor compartment being adapted to receive a stator (4) having a stator winding (5) and a rotor (12) fixed against rotation on a motor shaft (13), wherein, The partition wall (22) has a central shaft opening or bearing opening (26) for the motor shaft (13) and a number of notches (25) for phase connectors (11) for making the stator winding (5) in electrical contact with the electronic device (32). It is characterized in that a covering element (20) spanning the partition wall (22) is arranged in the electronic device compartment (24), and the covering element has through openings (31) for the phase connectors (11) corresponding to the notches (25) of the partition wall (22).

2. The electric motor (1) according to claim 1, It is characterized in that the covering element (20) is closely attached to the inner wall (28) of the housing (3).

3. The electric motor (1) according to claim 1 or 2, It is characterized in that the covering element (20) has a disc-shaped base body (34) and a cap edge (35) serving as a sealing ring, especially a cap edge made of elastomer or elastic plastic.

4. The electric motor (1) according to any one of claims 1 to 3, It is characterized in that a sealing element (36) at least partially surrounding the phase connector (11) is provided in the through opening (31) of the covering element (20).

5. The electric motor (1) according to claim 4, It is characterized in that the sealing element (36) is connected to the cap edge (35) of the covering element (20) via a sealing joint (37), especially a radial sealing joint.

6. The electric motor (1) according to any one of claims 1 to 5, It is characterized in that the covering element (20) has an axially raised cap region (38) to form a receiving space (39) for a signal transmitter (19) especially connected to the motor shaft (13) at the shaft end side, and the signal transmitter is especially an annular magnet.

7. The electric motor (1) according to any one of claims 1 to 6, It is characterized in that the covering element (20) has an axially raised cap section (40) for covering an annular receiving space (41) provided in the partition wall (22) for a spring washer (18), and the spring washer cooperates with a bearing (15) arranged in the shaft bearing opening (26) of the partition wall (22), especially cooperates with the outer ring or inner ring of a ball bearing.

8. The electric motor (1) according to claim 7, It is characterized in that radially oriented support ribs, centering ribs and / or positioning ribs (43) are formed on the inner side of the annular wall (42) of the annular receiving space (41) of the covering element (20).

9. The electric motor (1) according to any one of claims 1 to 8, It is characterized in that the covering element (20) has a number of especially radially oriented support ribs and / or stabilizing ribs (44) on the outer side facing away from the partition wall (22).

10. The electric motor (1) according to any one of claims 1 to 9, It is characterized in that A separating element (47), in particular a film-like one, is provided between the dividing wall (22) and the stator (4), by means of which the notch (25) and the dividing wall (22) are at least partially covered.

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