WO2019076696A1

WO2019076696A1 - Electrical drive unit for a motor vehicle

Info

Publication number: WO2019076696A1
Application number: PCT/EP2018/077573
Authority: WO
Inventors: Thomas Winter; Christian Lang; Thomas Klaas; Stefan Ruedinger; Ralf Hoebel; Michel Gross
Original assignee: Robert Bosch Gmbh
Priority date: 2017-10-18
Filing date: 2018-10-10
Publication date: 2019-04-25
Also published as: DE102017218596A1

Abstract

The invention relates to an electrical drive unit (1) for a motor vehicle, comprising a first housing (10), in which an electrical machine (12) and a transmission (14) coupled to the electrical machine (12) are arranged; a second housing (16), which is fastened to the first housing (10) and in which power electronics (18) are arranged; and a multi-functional connecting device (20), which is designed to provide an electrical connection and cooling of the power electronics (18) and the electrical machine (12).

Description

Description title

Electric drive unit for a motor vehicle

The invention relates to an electric drive unit for a motor vehicle. State of the art

Electric drive units for motor vehicles generally have a first housing, in which an electric machine and a transmission coupled to the electric machine are arranged. Furthermore, electric drive units have a second housing, in which power electronics are arranged. The power electronics is suitably connected to the electric machine by a plurality of electrical lines.

Due to the fact that during operation of the electric machine, in particular in the region of the winding core, a high waste heat is produced, which i.a. is also transmitted to the electrical lines, it may come in a disadvantageous manner to a heat input into the power electronics via the electrical lines.

DE 10 2015 225 843 AI discloses an electric drive unit having a housing which has a first housing part and a second housing part and accommodates the first and / or second housing part with an electronics unit.

Disclosure of the invention

The present invention provides an electric drive unit for a motor vehicle, comprising a first housing in which an electric machine and a transmission coupled to the electric machine are arranged, a second housing attached to the first housing, in which power electronics are arranged, and a multifunctional one

Connecting device, which is adapted to an electrical

To provide connection and a cooling of the power electronics and the electric machine.

An idea of the present invention is to provide a multifunctional

To provide connecting device which both the electrical

Connection between the power electronics and the electric machine provides as well as designed to dissipate the introduced from the electrical machine into the electrical connection heat accordingly, thus advantageously to avoid heat input into the power electronics via the electrical connection.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a preferred embodiment, it is provided that the

multifunctional connection device disposed within the first housing and is enclosed by a housing, wherein the second

Housing on the housing of the multifunctional connection device at least partially abuts, and wherein the housing of the multifunctional connection device has at least one opening through which a plurality of electrical contacts of the power electronics are performed.

Thus, it is possible in an advantageous manner, the second housing, in which the power electronics is arranged to put on the first housing or on the housing of the multifunctional connection device, that respective electrical contacts of the power electronics through the at least one opening of the housing of the multifunctional connection device

are feasible. This allows a simple modular design of the electric drive unit, in which the second housing, in which the Power electronics is arranged in a simple manner on the housing of the multifunctional connection device can be plugged.

According to a further preferred development, it is provided that the plurality of electrical contacts of the power electronics and the plurality of electrical contacts of the electric machine are detachably connected by a plurality of busbars arranged in the multifunctional connection device. Thus, a simple assembly and, if necessary, disassembly of the components of the electric drive unit can be provided in an advantageous manner.

According to a further preferred embodiment, it is provided that the plurality of electrical contacts of the power electronics each have a bore, wherein the plurality of busbars adjacent to the plurality of electrical contacts of the power electronics first end portions each having a first bore, wherein a respective one of the plurality of electrical contacts the power electronics and a respective one of the plurality of busbars by means of inserted into the adjacent holes arranged one another first fastening means, preferably screw-nut pairs, are interconnected. The respective holes of the electrical contacts of the power electronics and the respective holes in the region of the first end portion of the bus bars are advantageously overlapping, i. congruent to each other, arranged so that they can be fastened together by inserting the first fastening means.

According to a further preferred development, it is provided that the plurality of electrical contacts of the electric machine each have a bore, wherein the plurality of busbars adjacent to the plurality of electrical contacts of the electric machine second end portions each having a second bore, wherein a respective one of the plurality electrical contacts of the electric machine and a respective one of the plurality of busbars by means of inserted into the adjacent holes arranged second fastening means, preferably screw-nut pairs, are connected together. The respective holes of the electrical contacts of the power electronics and the respective holes in the region of the first end portion of

Bus bars are advantageously overlapping, i. congruent to each other, arranged so that they can be fastened together by inserting the second fastening means.

According to a further preferred embodiment it is provided that on an end plate of the electric machine, an insulating element is fixed, wherein the plurality of busbars are inserted into the insulating member, wherein the insulating member adjacent to the first bore of the plurality of

Bus bars has a respective third bore, in which the first fastening means are inserted, and wherein the insulating member adjacent to the second bore of the plurality of bus bars has a respective fourth bore, in which the second fastening means are inserted. The insulating element thus has both the function of guiding the respective

Busbars as well as the attachment of the busbars on the bearing plate.

According to a further preferred development, provision is made for a plurality of heat-conducting elements to be integrated in the insulating element, which abut the plurality of busbars and which are designed to

Heat from the majority of busbars to the end shield of the

dissipate electrical machine. By providing the heat conducting elements can thus be dissipated heat from the busbars to the end shield in an advantageous manner.

According to a further preferred embodiment, it is provided that the first fastening means inserted into the third bore of the insulating axially movable and the second fastening means are firmly inserted into the fourth bore of the insulating in the axial direction. Due to the axial

Fixing the busbars in the area of the fourth hole of the

Insulating element and due to the mere insertion of the first

Fastening means in the third bore of the insulating can be compensated in an advantageous manner an unfavorable tolerance position of the busbars by the mobility of the first fastening means in the third bore of the insulating. According to a further preferred embodiment, it is provided that the housing of the multifunctional connection device is formed by the bearing plate, preferably the B-end shield, the electric machine, wherein the housing of the multifunctional connection device has a housing cover at an axial end portion, wherein in one in the housing the multifunctional connecting device formed first groove, a first sealing element is used, which is the multifunctional

Connecting device seals to the housing cover back.

Due to the integration of the multifunctional connection device in the bearing plate of the electric machine, this can thus be provided in a space-saving manner in an advantageous manner, wherein the provision of the first sealing element, the electrical connection can be provided media-tight.

According to a further preferred embodiment, it is provided that the housing of the multifunctional connection device in the region of the opening through which the plurality of electrical contacts of the power electronics are performed, has a second groove, in which a second sealing element is used, the multifunctional connection means to the second housing seals off. Thus, the multifunctional connection device has a seal to both the first housing and the second housing, so that a secure media-tight sealing of the electrical lines can be provided.

According to a further preferred embodiment, it is provided that the housing of the multifunctional connection device has a further opening through which an electrical low-voltage line for signal transmission between the electric machine and the power electronics is performed, and wherein the further opening sealed by the second sealing element to the second housing is. The multifunctional connection device thus advantageously additionally has the function of the transition for high-voltage and low-voltage lines from the electric machine to the power electronics. The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the drawings

The accompanying drawings are intended to provide a further understanding of the

Embodiments of the invention mediate. They illustrate

Embodiments and in conjunction with the description serve to explain principles and concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

Fig. 1 is a schematic representation of an electric drive unit for a motor vehicle according to a preferred embodiment of the invention;

Fig. 2 is an enlarged detail view of the electrical shown in Fig. 1

Drive unit for the motor vehicle according to the preferred embodiment of the invention;

Fig. 3 is a longitudinal sectional view of a multifunctional

Connecting device of the electric drive unit for the motor vehicle according to the preferred embodiment of

Invention; 4 is an enlarged detail view of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention shown in FIG. 1; and

Fig. 5 is a schematic representation of a connection of the multifunctional

Connecting device to a housing of power electronics of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention.

In the figures of the drawings, like reference characters designate like or functionally identical elements, components or components, as far as nothing is concerned

The contrary is stated.

Fig. 1 shows a schematic representation of an electric drive unit for a motor vehicle according to a preferred embodiment of the invention.

The electric drive unit 1 for the motor vehicle has a first housing 10, a second housing 16 and a housing 22 of a multifunctional

Connecting device 20.

In the first housing 10, an electric machine 12 and a coupled to the electric machine 12 gear 14 is arranged. In the second housing 16, which is attached to the first housing 10, is a

Power electronics 18 arranged. The multifunctional connection device 20 is fixed to an axial end portion of the electric drive unit 1 at this and is adapted to an electrical connection and a

Heat dissipation of the power electronics 18 and the electric machine 12 provide.

The multifunctional connection device 20 is in this case screwed to the second housing 16 and has different screwing points on the electric machine. Furthermore, a housing cover 22b is mounted on the housing 22 of the multifunctional connection device 20. The multifunctional connection device 20 is arranged within the first housing 12 (shown only symbolically in FIG. 1). Further, the multifunctional connector 20 is from the housing 22

enclosed. The second housing 16 is located on the housing 22 of

multifunctional connection device 20 in sections. The housing 22 of the multifunctional connection device 20 has an opening (not shown in FIG. 1) through which a plurality of electrical contacts of the power electronics 18 are performed.

The housing 22 of the multifunctional connector 20 is supported by the end shield 32, i. the B-end shield, the electric machine 12

educated.

The housing 22 of the multifunctional connection device 20 has the housing cover 22b at an axial end section 22a. In a formed in the housing 22 of the multifunctional connection means 20 first groove 22c, a first sealing element 38 is inserted. The first sealing element 38 seals the multi-functional connecting device 20 to the housing cover 22b.

FIG. 2 shows an enlarged detail view of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention shown in FIG. 1.

The plurality of electrical contacts 18a, 18b, 18c of the power electronics 18 and the plurality of electrical contacts 12a, 12b, 12c of the electric machine 12 are detachably connected by a plurality of bus bars 26a, 26b, 26c arranged in the multifunctional connection device 20.

The plurality of electrical contacts 18a, 18b, 18c of the power electronics 18 each have a bore 18al, 18bl, 18cl. The majority of

Bus bars 26a, 26b, 26c each have a first bore 26al, 26bl, 26cl adjacent to the plurality of electrical contacts 18a, 18b, 18c of the power electronics 18 arranged first end portions 26d. A respective one of the plurality of electrical contacts 18a, 18b, 18c of Power electronics 18 and a respective one of the plurality of bus bars 26a, 26b, 26c are formed by means of screw-nut pairs inserted into the adjacently arranged bores 18al, 26al, 18bl, 26bl, 18cl, 26cl first fastening means 28a, 28b, 28c are interconnected.

Furthermore, the plurality of electrical contacts 12a, 12b, 12c of the electric machine 12 each have a bore 12al, 12bl, 12cl. The plurality of bus bars 26a, 26b, 26c each have a second bore 26a2, 26b2, 26c2 on second end portions 26e adjacent to the plurality of electrical contacts 12a, 12b, 12c of the electric machine 12.

A respective one of the plurality of electrical contacts 12a, 12b, 12c of the electric machine 12 and a respective one of the plurality of bus bars 26a, 26b, 26c are second fixing means 30a inserted in the adjacent holes 12al, 26a2, 12b, 26b2, 12c, 26c2 , 30b, 30c, which are formed by screw-nut pairs, connected together.

On the end plate 32 of the electric machine 12, an insulating member 34 is fixed, wherein the plurality of bus bars 26 a, 26 b, 26 c in the

Insulating element 34 are inserted. The insulating element 34 has, adjacent to the first bore 26al, 26bl, 26cl of the plurality of busbars 26a, 26b, 26c, a respective third bore 34al, 34bl, 34cl. In the respective third bore 34al, 34bl, 34cl, the first fastening means 28a, 28b, 28c are inserted.

Further, the insulating member 34 adjacent to the second bore 26 a 2, 26 b 2, 26 c 2 of the plurality of bus bars 26 a, 26 b, 26 c, a respective fourth bore 34 a 2, 34 b 2, 34 c 2. In the respective fourth hole 34a2, 34b2, 34c2, the second fastening means 30a, 30b, 30c are inserted.

Fig. 3 shows a longitudinal sectional view of a multifunctional

Connecting device of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention. In the present illustration, one of the first attachment means 28a is shown, which is inserted into the third bore 34al of the insulating member 34 axially movable. Further, one of the second fixing means 30a is axially fixedly inserted into the fourth hole 34a2 of the insulating member 34, ie, inserted so as to be immovable in the axial direction. The first

Fastener 28a and second fastener 30a are formed by a respective screw-nut pair, with the nut of first fastener 28a merely being inserted into and thus axially movable within third bore 34a, with second fastener 30a, i. the nut of the second attachment means 30a, with the fourth bore

34a2 of the insulating member 34 is engaged such that the second

Fastening means 30a axially immovable or firmly inserted.

4 shows an enlarged detail view of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention shown in FIG.

In the insulating member 34, a plurality of heat conducting elements 36a, 36b, 36c are integrated. The heat-conducting elements 36a, 36b, 36c abut against a plurality of busbars 26a, 26c. Furthermore, the heat-conducting elements 36a, 36b, 36c are designed to dissipate heat from the plurality of busbars 26a, 26c to the bearing plate 32 of the electrical machine 12.

5 shows a schematic representation of a connection of the multifunctional connection device to a housing of a power electronics of the electric drive unit for the motor vehicle according to the preferred embodiment of the invention.

The housing 22 of the multifunctional connection device 20 has, in the region of the opening 24, through which the plurality of electrical contacts of the power electronics (not shown in FIG. 5) can be carried out, a second groove 22d into which a second sealing element 40 is inserted. The second sealing element 40 seals the multifunctional connecting device 20 to the second housing. Furthermore, the housing 22 of the multifunctional connection device 20 has a further opening 42, through which a low-voltage electrical line 44 for signal transmission between the electric machine and the

Power electronics is performed. The further opening 42 is sealed by the second sealing element 40 to the second housing.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto but is modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

For example, a shape, size and / or nature of the components of the electric drive unit 1 for the motor vehicle can be modified.

Claims

claims

1 . Electric drive unit (1) for a motor vehicle, with

a first housing (10) in which an electric machine (12) and a transmission (14) coupled to the electric machine (12) are arranged; a second housing (16) attached to the first housing (10) and having power electronics (18) disposed therein; and

a multifunctional connection device (20), which is designed to provide an electrical connection and a cooling of the power electronics (18) and the electrical machine (12).

2. Electric drive unit according to claim 1, characterized in that the multifunctional connection device (20) within the first housing (12) and enclosed by a housing (22), wherein the second housing (16) on the housing (22) of multifunctional connection device (20) at least partially abuts, and wherein the housing (22) of the multifunctional connection device (20) has at least one opening (24) through which a plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) are performed ,

3. Electric drive unit according to claim 2, characterized in that the

A plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) and the plurality of electrical contacts (12a, 12b, 12c) of the electrical machine (12) by a plurality of in the multifunctional connection means (20) arranged busbars (26a, 26b , 26c) are releasably connected.

4. Electric drive unit according to claim 3, characterized in that the plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) each have a bore (18a1, 18b1, 18c1), wherein the plurality of

Busbars (26a, 26b, 26c) to the plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) arranged adjacent first End portions (26d) each having a first bore (26a1, 26b1, 26c1), wherein a respective one of the plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) and a respective one of the plurality of busbars (26a, 26b, 26c) by means of in the mutually adjacent holes (18a1, 26a1, 18b1, 26b1, 18c1, 26c1) inserted first fastening means (28a, 28b, 28c), preferably screw-nut pairs, are interconnected.

5. Electric drive unit according to claim 4, characterized in that the plurality of electrical contacts (12a, 12b, 12c) of the electric machine (12) each have a bore (12a1, 12b1, 12c1), wherein the plurality of busbars (26a, 26b , 26c) each have a second bore (26a2, 26b2, 26c2) adjacent to the plurality of electrical contacts (12a, 12b, 12c) of the electric machine (12), wherein a respective one of the plurality of electrical contacts (26 12a, 12b, 12c) of the electrical machine (12) and a respective one of the plurality of busbars (26a, 26b, 26c) by means inserted in the adjacent holes (12a1, 26a2, 12b1, 26b2, 12c1, 26c2) second fastening means ( 30a, 30b, 30c), preferably screw-nut pairs, are interconnected.

6. Electric drive unit according to one of the preceding claims, characterized in that on an end plate (32) of the electrical machine (12), an insulating element (34) is fixed, wherein the plurality of bus bars (26 a, 26 b, 26 c) in the insulating ( 34), wherein the insulating member (34) adjacent to the first bore (26a1, 26b1, 26c1) of the plurality of

Bus bars (26a, 26b, 26c) having a respective third bore (34a1, 34b1, 34c1) into which the first attachment means (28a, 28b, 28c) are inserted, and wherein the isolation member (34) adjacent to the second bore (26a2 , 26b2, 26c2) of the plurality of bus bars (26a, 26b, 26c) has a respective fourth bore (34a2, 34b2, 34c2) into which the second attachment means (30a, 30b, 30c) are inserted.

7. Electric drive unit according to claim 6, characterized in that in the insulating member (34) a plurality of heat conducting elements (36a, 36b, 36c) are integrated, which abut the plurality of bus bars (26a, 26b, 26c), and which are formed, heat from the plurality of Busbars (26a, 26b, 26c) to the bearing plate (32) of the electric machine (12) dissipate.

8. An electric drive unit according to claim 6 or 7, characterized in that the first fastening means (28a, 28b, 28c) in the third bore (34a1, 34b1, 34c1) of the insulating member (34) inserted axially movable and the second fastening means (30a, 30b, 30c) are fixedly inserted into the fourth bore (34a2, 34b2, 34c2) of the insulating member (34) in the axial direction (L).

9. Electric drive unit according to one of claims 6 to 8, characterized

characterized in that the housing (22) of the multifunctional

Connecting device (20) through the bearing plate (32), preferably the B- bearing plate, the electric machine (12) is formed, wherein the housing (22) of the multifunctional connecting device (20) at an axial

End portion (22a) has a housing cover (22b), wherein in a in the housing (22) of the multifunctional connection means (20) formed first groove (22c), a first sealing element (38) is inserted, which the multifunctional connection means (20) to the housing cover (22b) seals off.

10. Electric drive unit according to claim 9, characterized in that the housing (22) of the multifunctional connection device (20) in the region of the opening (24) through which the plurality of electrical contacts (18a, 18b, 18c) of the power electronics (18) are, a second groove (22d), in which a second sealing element (40) is inserted, which seals the multi-functional connecting means (20) to the second housing (16) out.

1 1. Electric drive unit according to claim 10, characterized in that the housing (22) of the multifunctional connection device (20) has a further opening (42) through which a low-voltage electrical line (44) for signal transmission between the electric machine (12) and the

Power electronics (18) is performed, and wherein the further opening (42) through the second sealing element (40) is sealed to the second housing (16) out.