阅读说明：本技术 用于机动车辆的电驱动单元 (Electric drive unit for a motor vehicle ) 是由 F·马格亚 F·洛赫 于 2020-05-06 设计创作，主要内容包括：本发明涉及一种用于机动车辆的电驱动单元,所述电驱动单元具有两个电力驱动器(5A、5B),所述电力驱动器设置在共同的驱动器壳(3)的壳体(4)中并且分别包括定子和随转子轴(8A、8B)转动的转子(8)。所述转子轴(8A、8B)相邻的轴端部(10A、10B)都旋转支承在轴承壳(25)中,所述轴承壳是刚性地设置在驱动器壳(3)的支承板(20)的中央区域。为了实现具有两个前后相继地设置在共同的驱动器壳中的电力驱动器的电驱动单元,而不会由此带来在驱动器壳的强度上的缺点,所述支承板(20)的组成部件包括撑杆(21、22、23),这些撑杆从轴承壳(25)向外延伸并且将轴承壳(25)与驱动器壳(3)的所述壳体(4)连接。(The invention relates to an electric drive unit for a motor vehicle, comprising two electric drives (5A, 5B) which are arranged in a housing (4) of a common drive housing (3) and each comprise a stator and a rotor (8) which rotates with a rotor shaft (8A, 8B). The adjacent shaft ends (10A, 10B) of the rotor shafts (8A, 8B) are rotatably mounted in a bearing housing (25) which is rigidly arranged in the central region of a bearing plate (20) of the drive housing (3). In order to realize an electric drive unit having two electric drives arranged one behind the other in a common drive housing without this entailing disadvantages in terms of the strength of the drive housing, the component parts of the support plate (20) comprise struts (21, 22, 23) which extend outwardly from the bearing housing (25) and connect the bearing housing (25) to the housing (4) of the drive housing (3).)

1. Electric drive unit for a motor vehicle, having two electric drives (5A, 5B) which are arranged in a housing (4) of a common drive housing (3) and each comprise a stator and a rotor (8) which rotates with a rotor shaft (8A, 8B), the adjacent shaft ends (10A, 10B) of the rotor shafts (8A, 8B) being rotatably supported in bearing housings (25) which are rigidly arranged in a central region of a bearing plate (20) of the drive housing (3), characterized in that the component parts of the bearing plate (20) comprise struts (21, 22, 23) which extend outwardly from the bearing housings (25) and connect the bearing housings (25) to the housing (4) of the drive housing (3).

2. An electric drive unit according to claim 1, characterized in that only the spacers (21, 22, 23) form the outer circumference of the support plate (20) with their outer ends and connect the support plate (20) with the housing (4).

3. Electric drive unit according to claim 1 or 2, characterized in that there are at least three struts (21, 22, 23) which divide an equal number of openings (31, 32, 33) in the form of sector-shaped openings arranged around the bearing housing (25) on the support plate (20).

4. An electric drive unit according to claim 3, characterized in that the first opening (31) is located in the driver housing (3) at the underside.

5. An electric drive unit as claimed in claim 4, characterized by a coolant opening (70) formed in the housing (4) of the drive housing (3) below, said coolant opening radially into the first opening (31).

6. An electric drive unit according to claim 5, characterized in that the coolant port (70) connects the first opening (31) with a coolant reservoir (71) provided externally on the housing (4).

7. An electric drive unit according to any one of claims 4 to 6, characterized in that the first opening (31) is smaller than each further opening (32, 33).

8. An electric drive unit according to claim 7, characterized in that the further openings (32, 33) have the same size.

9. Electric drive unit according to any one of the preceding claims, characterized in that a coolant channel (40) extends through at least one strut (22, 23), which coolant channel leads from a coolant opening (41) provided to the housing (4) in the extension of the strut (22, 23) all the way to the bearing housing (25).

10. An electric drive unit as claimed in claim 9, characterized in that the coolant opening (41) is a threaded bore, the cross section of which is greater than the cross section of the coolant channel (40) extending in the strut (22, 23), and into which a coolant stub (42) is screwed.

11. Electric drive unit according to claim 9 or 10, characterized in that the struts have different widths, viewed in the circumferential direction of the support plate (20), and in that the width of the struts (22, 23) through which coolant channels (40) extend is greater than the width of the struts (21) in which no coolant channels extend.

12. Electric drive unit according to any one of claims 9 to 11, characterized in that separate rolling bearings (45A, 45B) for the shaft ends (10A, 10B) of the two rotor shafts (8A, 8B) are provided in the bearing housing (25), each rolling bearing (45A, 45B) enclosing the respective shaft end (10A, 10B) with its inner ring and being supported in the bearing housing (25) with its outer ring, and that the bearing housing (25) is provided with a through hole (47) centrally provided therein, into which the shaft ends (10A, 10B) extend and into which the coolant channel (40) opens.

13. The electric drive unit according to any one of claims 3 to 12, characterized in that a window (62, 63) is formed in the housing (4) in the region of the two openings (32, 33), through which window and through the respective opening (32, 33) the electric lines lead to the electric drive (5A, 5B).

14. Electric drive unit according to claim 13, characterized in that the windows (62, 63) are provided on peripheral sections of the housing (4) facing away from each other, the windows (62, 63) being covered externally by a protective box (64, 65), and in that an electric connecting clamp (59) is provided in the protective box (64, 65), to which an electric line is connected.

15. Electric drive unit according to claim 14, characterized in that the main extension direction of the protective box (64, 65) is parallel to the longitudinal direction of the driver housing (3).

16. Electric drive unit according to any of claims 13 to 15, characterized in that the first electric lead leads to a first terminal block (61A) mounted on the first electric drive (5A), said first terminal block extending into one opening (32), and the second electric lead leads to a second terminal block (61B) mounted on the second electric drive (5B), said second terminal block extending into the other opening (33).

17. An electric drive unit according to claim 16, characterized in that the terminal plates (61A, 61B) extend into the openings (32, 33) such a distance that the terminal plates (61A, 61B) partly overlap in the longitudinal direction of the driver housing (3).

18. Electric drive unit according to any one of the preceding claims, characterized in that each strut (21, 22, 23) is axially supported on a rib (60) projecting inwardly from the housing (4).

19. An electric drive unit according to claim 18, characterized in that the rib (60) is an integral part of the housing (4).

20. Electric drive unit according to claim 18 or 19, characterized in that the rib (60) consists circumferentially of a plurality of individual, separate rib sections and that the rib sections are provided only on peripheral sections of the housing (4) which are provided with struts (21, 22, 23).

21. Electric drive unit according to claim 20, characterized in that the housing (4) is provided with windows (62, 63), openings or similar through openings on the peripheral section without rib sections.

22. Electric drive unit according to claim 1, characterized in that the support plate (20) is arranged in the drive housing (3) such that the support plate (20) has the same axial distance to each of the two electric drives (5A, 5B).

23. Electric drive unit according to claim 1, characterized in that the two rotor shafts (8A, 8B) have rotation axes (a) which are flush with each other.

24. Electric drive unit for a motor vehicle, having two electric drives (5A, 5B) which are arranged in a housing (4) of a common drive housing (3) and each comprise a stator and a rotor (8) which rotates with a rotor shaft (8A, 8B), the adjacent shaft ends (10A, 10B) of the rotor shafts (8A, 8B) being rotatably supported in bearing housings (25) which are rigidly arranged in a central region of a bearing plate (20) of the drive housing (3), and components of the bearing plate (20) furthermore having connection regions which extend outward from the bearing housings (25) and connect the bearing housings (25) to the housing (4), characterized by at least one coolant channel (40) which is guided from a coolant opening (41) in the housing (4) through the connection regions into the bearing housings (25) at all times ) In (1).

25. An electric drive unit according to claim 24, characterized in that the coolant channel (40) passes through the connection region in a radial direction.

26. An electric drive unit according to claim 24 or 25, characterized in that the coolant opening (41) is a threaded hole, the cross section of which is larger than the cross section of the coolant channel (40), and into which a coolant nipple (42) is screwed.

Technical Field

The present invention relates to an electric drive unit according to the preamble of claim 1.

The invention further relates to an electric drive unit according to the preamble of independent claim 24.

Background

An electric drive unit having two electric drives arranged on mutually flush axes of rotation is known from WO 98/40958. Although the two electric drives are located within the housing of a common drive housing, they are otherwise independent of one another and are each provided with their own rotor shaft, whose shaft ends facing away from one another issue from the drive housing. The other, mutually adjacent shaft ends of the rotor shaft are rotatably mounted in a bearing housing. The bearing housing is a central region of a support plate which is designed as a circular plate and divides the drive housing into a first housing part with a first electric drive and a second housing part with a second electric drive.

Since one of the two rotary bearings of the rotor shaft is provided on the bearing plate with the bearing housing centrally arranged therein, said bearing plate is accordingly designed with a large size, whereby the bearing plate contributes to an increase in the strength of the drive housing in addition to supporting the shaft forces. The structural length of the drive housing is therefore decisive not only for the size of the electric drive unit itself but also for the additional installation space required by the support plate.

Disclosure of Invention

The object of the present invention is to provide an electric drive unit having two electric drives arranged one behind the other in a common drive housing, which is compact in the longitudinal direction without this entailing disadvantages in terms of the strength of the drive housing.

In order to achieve the object, an electric drive unit is proposed having the features of claim 1. In such an electric drive unit, there is no complete plate serving as a support plate, but rather a support rod as an integral part of the support plate, which support rod extends outward from a bearing housing centrally arranged in the support plate. The struts together form a connecting region which connects the centrally arranged bearing housing to the housing of the drive housing. Since the support plate is not a full-surface component, but rather the connection region of the support plate is formed by only a single strut, openings and thus cavities are left between the struts. The openings provide locations for electrical terminals for an electrical drive or for cooling measures, for example, and thus for measures that would otherwise require additional installation space in the drive housing. The bearing plate and the bearing housing can be arranged in the drive housing in a form-fitting and force-fitting manner, in which case the drive housing can also be embodied in one piece with the bearing plate and the bearing housing by casting.

At the same time, it has proven to be unnecessary to design the support plate as a full-surface plate for sufficient stability and thus for the desired overall strength of the drive housing. A sufficient rigidity and thus a contribution to the overall strength of the drive housing can be achieved by means of the support plate consisting of discrete struts which extend radially outward from the bearing housing and thus establish a single connection with the surrounding housing.

To achieve the object, an electric drive unit having the features of claim 24 is also proposed. Such a drive unit is characterized by at least one coolant channel which leads from a coolant opening in the housing through the connection region into the bearing shell.

In such an electric drive unit, the mutually adjacent shaft ends of the rotor shaft are also rotatably supported in a bearing housing, which is the central region of a support plate arranged rigidly in the drive housing. The connecting region, which extends outward from the bearing shell and connects the bearing shell to the housing, forms a subregion of the support plate. The connecting region has an additional function in addition to its static, strength-determining function, since coolant channels are distributed through the connecting region, through which coolant channels, for example, a cooling fluid is supplied to the motor component or also the transmission component.

For this purpose, the coolant channel is preferably guided in the radial direction from a coolant opening in the housing through the connection region into the bearing shell. By these constructional steps, the cooling measures necessary for the drive unit are arranged in the support plate. Thus, positions for these measures are realized in the support plate, which otherwise would require additional installation space in the drive housing. In addition, depending on the position provided in this way, cooling fins can be formed on the outer surface of the housing and/or of the coolant bath in order to increase the heat transfer from the inside to the outside.

Preferred embodiments of the electric drive unit are specified in the dependent claims.

If the connecting region of the bearing plate consists of a single strut, it is advantageous for the purpose of achieving the largest possible opening between the struts to form the outer circumference of the bearing plate exclusively by the struts with their outer ends and to connect the bearing plate to the housing of the drive housing exclusively by the struts. That is to say, the struts are connected to one another only at their inner ends, that is to say via the bearing shells, and are not connected to one another at their outer ends. The outer end of the strut is instead connected only to the housing of the drive housing.

Preferably three or more struts form said connection area of the support plate, said struts dividing the same number of three or more openings in the support plate. The opening preferably has the form of a sector-shaped opening arranged around the bearing shell.

According to one embodiment, the first opening is located in the lower side of the drive housing. A coolant opening formed in the housing of the drive housing at the bottom opens radially into the first opening. In this way, the coolant opening connects the first opening with a coolant reservoir which is arranged liquid-tightly on the outside of the housing.

Since the first opening is only used for the coolant port, the first opening can be designed to be small. It is therefore proposed that the first opening is smaller than each further opening. The further openings preferably each have the same dimensions.

A coolant channel extends through at least one of the struts, said coolant channel leading from a coolant opening provided to the housing in the extension of the strut into the bearing shell. In this way, coolant can be conducted by forming coolant channels in the struts into the region of the bearing shell centrally arranged in the bearing plate, in order to supply coolant, for example, to a rolling bearing for the shaft end of the rotor shaft arranged there.

The coolant opening is preferably a threaded bore, the cross section of which is greater than the cross section of the coolant channel running in the strut, into which the coolant connection piece is screwed.

With a further embodiment, it is provided that the struts have different widths, as viewed in the circumferential direction of the bearing plate, and that the width of the struts through which the coolant channels extend is greater than the width of the struts in which no coolant channels extend.

It is also proposed that separate rolling bearings for the shaft ends of the two rotor shafts be provided in a bearing housing, each rolling bearing surrounding the respective shaft end with its inner ring and being supported in the bearing housing with its outer ring. The bearing housing is provided with a through-opening arranged centrally therein, the shaft ends extend into the through-opening from both sides and the coolant channel opens into the through-opening

According to a further embodiment, in the region of the two openings, a window is formed in each case in the housing, through which window the electrical lines are routed in a space-saving manner to the electrical drive and through the respective opening.

The windows are preferably arranged on peripheral sections of the housing facing away from each other. The window is covered on the outside by a protective box which can be fixed in a modular manner to the drive housing or integrally co-cast on the drive housing. An electrical connecting clamp is provided in the protective case, to which an electrical line is connected. In order to keep the outer dimensions of the electric drive unit compact, the protective box preferably has a main direction of extension parallel to the longitudinal direction of the drive housing.

In addition, it is advantageous for a compact design of the drive unit to be achieved if the first electrical line leads to a first terminal block, which is mounted on the first electrical drive and which extends into one opening, and the second electrical line leads to a second terminal block, which is mounted on the second electrical drive and which extends into the other opening. The cavity provided in the carrier plate by means of the opening is thus used for space-saving arrangement of the terminal block of the electrical drive therein.

This embodiment is particularly advantageous if two terminal blocks are arranged in the housing at different peripheral sections and if the terminal blocks extend into the opening over such a distance that they partially overlap in the longitudinal direction of the drive housing.

In connection with the connection of the struts to the housing of the drive housing, it is proposed that each strut is supported axially on a rib projecting inwardly from the housing, and that the strut is welded to the housing in this position. The ribs are preferably an integral part of the housing. In a further possible embodiment, the housing and the support plate are produced in one piece, for example by casting.

The rib preferably consists of individual, separate rib sections in the circumferential direction, and the rib sections are provided only on the peripheral section of the housing, which section is provided with the struts. This design also helps to make the sector opening between the ribs as large as possible.

Furthermore, the limitation of the individual rib sections also brings the advantage that the housing can be provided with windows, openings or similar through openings in the peripheral sections without rib sections.

The bearing plate is preferably arranged in the drive housing such that the bearing plate has the same axial distance from the two electric drives.

Drawings

Further advantages and details emerge from the following description of an embodiment with reference to the drawing. Wherein:

fig. 1 shows an electric drive unit integrated in an axle for a motor vehicle in a general perspective view;

fig. 2 shows a longitudinal view of the drive unit, wherein the central region is shown as a longitudinal section in the vertical section of fig. 1;

fig. 3 shows a further longitudinal view of the drive unit, wherein the central region is shown as a longitudinal section in the horizontal section plane in fig. 1;

fig. 4 shows a central region of the electric drive unit in an enlarged illustration relative to fig. 2, including the support plate arranged there;

fig. 5 shows the electric drive unit in the viewing direction V indicated in fig. 1;

fig. 6 shows a transverse section through the electric drive unit in the region of the support plate;

FIG. 7 shows a detail view of the support plate;

FIG. 8 shows another detail of the support plate, here in perspective;

fig. 9 shows a longitudinal view of a second embodiment of the drive unit, wherein the central region is shown as a longitudinal section in a vertical section plane.

Detailed Description

Fig. 1 shows an overview of a central longitudinal section of an electrically driven axle. The sections and individual components of the axle that are arranged further to the outside of the vehicle towards both sides are not shown. This includes, for example, a vehicle-mounted axle stub of the vehicle axle, on which a wheel hub with a wheel is rotatably mounted. The pipe sections 2 shown in fig. 1 each belong to a drive shaft, via which the drive torque reaches the respective wheel.

Fig. 1 shows an intermediate region of the electric axle, which is composed, on the housing side, of a drive housing 3, in which two electric drives are arranged, a first transmission housing 3A at one end of the drive housing 3 and a second transmission housing 3B at the other end of the drive housing 3. A transmission, preferably a planetary gear transmission, is located in the transmission housing 3A, 3B, through which transmission forces pass from the electric drive 5A, 5B to the drive shaft visible on the pipe section 3.

The drive housing 3 is composed of a housing 4 which is designed essentially in the form of a cylinder. On both end sides, the driver housing 3 is closed by flanges screwed thereto. Which in the exemplary embodiment described here are part of the respective transmission housing 3A, 3B.

The drive housing 3 is composed of a housing 4 which is designed essentially in the form of a cylinder. On both end sides, the driver housing 3 is closed by flanges screwed thereto. The flanges are in the exemplary embodiment described here part of the respective transmission housing 3A, 3B.

According to fig. 2, the interior of the driver housing 3 is essentially divided into two parts, wherein the first power driver 5A occupies half of the driver housing 3 and the second power driver 5B occupies the other half of the driver housing 3. The axes of rotation a of the two electric drives 5A, 5B are flush but not connected to each other. The two electric drives 5A, 5B are therefore located in the housing 4 and thus inside the common drive housing 3, but are otherwise independent of one another and are each provided with a respective rotor shaft 8A, 8B. The first shaft ends of the rotor shafts are directed away from each other to the respective gear. The other two, i.e. mutually facing or adjacent shaft ends 10A, 10B of the rotor shafts 8A, 8B are rotatably mounted in a common bearing housing 25, but are not mechanically coupled.

Fig. 2 also shows the stators of the electric drives 5A, 5B and the corresponding rotors 8, which are connected in a rotationally fixed manner to their respective rotor shafts 8A, 8B. The two rotor shafts rotate on the same rotational axis, that is to say the rotational axes a of the rotor shafts are flush with one another and both extend in the longitudinal direction of the driver housing 3.

That is, it is not excluded that the two power drivers 5A, 5B operate independently of each other, the two power drivers being able to operate synchronously.

In the drive housing 3, a support plate 20 is provided, which is arranged transversely to the axis of rotation a, just at the midpoint between the two electric drives 5A, 5B. The components of the bearing plate 20 comprise the already mentioned bearing housing 25 which rotatably supports the shaft ends 10A, 10B and a plurality of struts 21, 22, 23. These struts 21, 22, 23 extend preferably radially outwards from the bearing shell 25. These struts 21, 22, 23 together form a connecting region which rigidly connects the centrally arranged bearing housing 25 to the substantially cylindrical housing 4 of the drive housing 3.

The support plate 20 has several functions. The first function is to position the bearing housing 25 rigidly inside the drive housing 3, so that the mutually adjacent shaft ends 10A, 10B of the rotor shafts 8A, 8B are positively rotatably supported. Another function of the support plate 20 is to achieve a contribution to the strength and static properties of the drive housing 3. This is particularly because the drive housing 3 is generally tubular and has open end faces which are covered only by the transmission housing. Another function of the support plate 20 is to accommodate coolant channels, through which coolant can flow, in particular to the individual actuator parts.

According to fig. 6 to 8, the support plate 20 is not a complete plate, but rather the support plate 20 is composed of the already mentioned struts 21, 22, 23 which extend preferably radially outward from a bearing shell 25 centrally arranged in the support plate 20. The connection region, via which the bearing shell 25 is connected to the housing 4, is formed exclusively by these discrete struts 21, 22, 23.

Since the support plate 20 is not a full-face component, the same number of openings 31, 32, 33 and thus cavities are left between the struts. These openings 31, 32, 33 or cavities provide space for cooling measures or for accommodating electrical connection boards. These openings or cavities thus provide locations for measures that might otherwise require additional installation space in the drive housing 3.

It is also not necessary for the stability of the support plate 20 and thus for the strength of the drive housing 2 that the support plate 20 is a full-surface component. The support plate 20 can also achieve sufficient rigidity with the connecting region consisting of the discrete struts 21, 22, 23 and thus contribute to the strength of the drive housing 3 overall.

According to fig. 6-8, the support plate 20 preferably has a total of three struts 21, 22, 23. The struts are arranged relative to each other such that the struts, viewed in a view along the axis of rotation a, together form an inverted "Y". The angular distance between the two struts 22, 23 is smaller than the angular distance between each of the two struts 22, 23 and the strut 21. Hereinafter, the stay 21 extending upward when the drive shaft is mounted in the vehicle is referred to as a first stay, and the stays 22 and 23 directed obliquely downward in the vehicle are referred to as second or third stays.

Between the second brace 22 and the third brace 23 there is a first opening 31 in the form of a fan-shaped opening. Between the first and second struts 21, 22 there is an opening 33, also in the form of a fan-shaped opening. Between the first strut 21 and the third strut 23 there is an opening 32, also in the form of a fan-shaped opening.

In this embodiment, the openings or fan-shaped openings 32, 33 are of the same size, whereas the opening 31 located below has a smaller opening area when the axle is mounted, due to the smaller angle between the struts 22, 23.

The struts 21, 22, 23 have different widths in the axial direction of the support plate. The width of the two struts 22, 23 through which the coolant channel 40 extends is greater than the width of the first strut 21 through which no cooling channel extends. The cross section of the struts in which no coolant channels 40 extend can furthermore have a smaller thickness. For example. The stay may be provided with weight-reducing recesses in a cross-section not used for cooling purposes.

Coolant channels 40 running in the struts 22 and/or in the struts 23 extend from the bearing shell 25 up to coolant openings 41 which open into the interior of the bearing shell and which are provided in the extension of the struts to the housing 4. The coolant opening 41 is a radially threaded hole in the housing 4. The cross section of the coolant opening 41 is greater than the cross section of the coolant channel 40 running in the struts 22, 23, so that the coolant connection piece 42 can be screwed into the threaded bore without loss of coolant pressure. A coolant is fed through the coolant connection 42, which coolant then passes through the coolant channel 40 to the center of the bearing housing 25 in order to cool the rolling bearings 45A, 45B of the rotor shaft arranged there.

The bearing housing 25 is wider than the width or thickness of the stay 21, 22, 23 in the longitudinal direction of the driver housing 3. The bearing shell 25 is provided with a through-hole 47 on the rotational axis a, which consists of a plurality of longitudinal sections. The two outer longitudinal sections of the through-hole 47 are bearing receptacles in which the outer rings of the rolling bearings 45A, 45B supporting the rotor shaft are fitted. The coolant channel 40 opens in a central longitudinal section of the through-opening 47. Between the longitudinal sections described there is a further, shorter longitudinal section, which serves as a coolant supply for the rolling bearing 45A or 45B. By means of this coolant supply structure which opens in each case between the inner ring and the outer ring of the rolling bearings 45A, 45B, a part of the coolant which flows into the through-openings 47 through the coolant channel 40 reaches the region of the rolling bodies of the rolling bearings 45A, 45B.

According to fig. 4, the two rotor shafts 8A, 8B are hollow shafts over at least a part of their length, which are open toward one another. Another part of the coolant flowing through the coolant channel 40 into the through-opening 47 can thus flow into the rotor shafts 8A, 8B and from there through the transverse bores 51 formed in the rotor shafts 8A, 8B into the rotor 8 of the respective electric drive.

For supporting the drive housing 3, the struts 21, 22, 23 are supported with their outer ends radially on the housing 4. In addition, each strut 21, 22, 23 is supported axially on a rib 60, which is integrally formed on the housing 4 on the inside. The longitudinal position of the bearing plate 20 inside the driver housing 3 is uniquely determined by the axial support on the ribs 60.

However, the rib 60 is not a continuous rib over the entire circumference of the housing 4, but rather the rib is formed in the circumferential direction from individual, separate rib sections. These rib sections are preferably only located on such peripheral sections of the housing 4, where the outer ends of the struts 21, 22, 23 are also located.

Since the rib 60 consists of a single rib section, the housing 4 can be provided with e.g. windows, openings or similar through openings on the peripheral section without rib sections. In this exemplary embodiment, this serves to form a window 62, 63 in the housing in the region of the second opening 32 and in the region of the third opening 33, respectively.

The electrical leads are led through the windows 62, 63 and through the second opening 32 or the third opening 33 to the terminal blocks 61A, 61B of the electric drivers 5A, 5B. The two terminal blocks 61A, 61B are arranged on different, that is to say opposite, peripheral sections within the housing 4. Accordingly, two windows 62, 63 are also formed in the housing 4 on opposite peripheral sections.

The windows 62, 63 are covered externally by protective boxes 64, 65, respectively. An electrical connection clip 59 is located in the protective box 65, from which electrical conductors lead to a terminal block 61A of the first power driver 5A. The ground of the electrical line is connected in the threaded bore 69 of the bearing housing 25. In the other protective box 64, electrical connecting clamps 59 are also provided, from which the electrical lines lead to the terminal block 61B of the second electrical drive 5B. The ground of the electrical line is also connected in the threaded bore of the bearing housing 25.

The terminal board 61A of the first electric power driver 5A extends up to the opening 32, and the terminal board 61B of the second electric power driver 5A extends up to the opening 33. In order to achieve a particularly compact arrangement, the two terminal plates 61A, 61B extend into the respective opening 32, 33 to such an extent that the terminal plates 61A, 61B partially overlap in the longitudinal direction of the drive housing 3.

In order to keep the electric drive unit inside the associated vehicle compact, the protective boxes 64, 65 are designed such that the main direction of extension of the protective boxes 64, 65 is parallel to the axis of rotation a (fig. 1). The protective boxes 64, 65 preferably extend in such a direction that the connecting cables can be routed on only one vehicle side.

The housing 4 is provided with one or more coolant openings 70 at its lowest point in the longitudinal section of the drive housing 4 in which the support plate 20 is located. Due to this position of the coolant orifice 70, it connects the first opening 31 arranged between the struts 22, 23 with a coolant reservoir 71 arranged externally on the housing 4. Therefore, the coolant can flow out through the coolant port 70 to the coolant pool 71 disposed at the lowest position of the drive unit and be collected therein.

Suitable for use as a coolant is primarily cooling oil, since this cooling oil also flows through parts of the electric motor. The cooling oil should have such a specification that, in addition, it has good lubricating properties when lubricating the rolling bearings 45A, 45B and the other rolling bearings of the drive unit.

Fig. 9 shows a second embodiment of the drive unit 3, wherein the rotor shaft is not shown in this figure. According to fig. 9, the bearing plate 20, the bearing housing 25 and the drive housing 3 are produced in one piece by casting, the structural configuration of which is identical in the assembled state to the multi-part system according to fig. 2 to 6.

Furthermore, a distributor 72 is formed on the outside on the drive housing 3 in the region of the coolant channel 40, said distributor 72 also being formed integrally on the drive housing 3. The distributor base 72 has three further bores in addition to the coolant channels 40, wherein the first bore 43 extends through the distributor base 72 parallel to the axis of rotation a. The second and third holes 44A, 44B extend in parallel to the left and right of the coolant passage 40, and intersect the first hole 43 and pass through the outer wall of the driver case 3. For manufacturing reasons, the first, second and third bores 43, 44A, 44B are configured as through bores, the bores on the outside of the dispensing seat 72 being sealed off afterwards by the plug 73.

The first, second and third bores 42, 44A, 44B are provided for conducting the coolant out of the coolant channel 40 and for conducting the coolant into an annular gap 74A, 74B, which surrounds the stator on the outside. The coolant is introduced into the interior of the electric drives 5A, 5B via a not shown inlet opening which surrounds the stator in an annular manner, wherein the coolant is again supplied via a not shown coolant opening to a likewise not shown coolant reservoir. Thereby, an additional cooling of the electric drive unit is achieved.

List of reference numerals

2 pipe section

3 driver shell

3A transmission device shell

3B transmission device shell

4 casing

5A electric power driver

5B power driver

8 rotor

8A rotor shaft

8B rotor shaft

10A shaft end

10B shaft end

20 support plate

21 brace rod

22 brace rod

23 brace rod

25 made into a shell

31 opening

32 opening

33 opening

40 coolant channels

41 coolant port

42 coolant connection pipe

43 first hole

44A second hole

44B third hole

45A rolling bearing

45B rolling bearing

47 through hole

51 transverse hole

59 connecting wire clamp

60 Rib

61A wiring board

61B wiring board

62 window

63 Window

64 protective box

65 protective box

68 electric lead

69 threaded hole for ground wire

70 coolant port

71 Coolant pool

72 dispensing base

73 plug

74A annular gap

74B annular gap

Axis of rotation A