WO2015110231A1

WO2015110231A1 - Connecting arrangement for a power terminal of an electric machine

Info

Publication number: WO2015110231A1
Application number: PCT/EP2014/078146
Authority: WO
Inventors: Gerald Viernekes; Alexander Schäflein; Manfred Zimmer
Original assignee: Zf Friedrichshafen Ag
Priority date: 2014-01-23
Filing date: 2014-12-17
Publication date: 2015-07-30
Also published as: CN206349856U; DE102014201190A1

Abstract

Disclosed is a connecting arrangement (1) for bringing a multipole, in particular a triple-pole, power terminal for applying power to an electric machine in contact with a multipole, in particular triple-pole terminal on the stator of the electric machine. According to the invention, an individual connecting bush (10) is provided on each pole of the multipole terminal on the stator.

Description

Connection arrangement for power connection of an electrical machine

The present invention relates to a connection arrangement for contacting a multi-pole, in particular 3-pole, power connection for applying an electrical machine with an electrical power with a multi-pole, in particular 3-pole, stator-side connection of the electric machine.

From the prior art, for example DE 10 2007 008 098, a connection arrangement for contacting a multi-pole power connection of an electrical machine with a multi-pole stator-side connection of the electrical machine is known. In this case, the known connection arrangement on a connection housing, in particular made of plastic, which is fitted in an opening of a housing of the electric machine, in particular a gear housing, fit. In turn, power connection sockets which contact the stator-side connection points are formed on this housing itself. In this case, the power connector sockets and the connector housing are integrally made of a plastic component and must be placed only in the opening in the housing of the electric machine.

A disadvantage of this prior art, however, is that the connection housing and the opening in the housing of the electrical machine must be coordinated. This means at the same time that for each type of electrical machine a separately manufactured connection housing must be stored, which is expensive on the one hand and easy to install on the other hand.

Object of the present invention is therefore to provide a connection arrangement between a power connection and a stator-side connection of the electric machine, which is universally applicable.

This object is achieved by a connection arrangement according to claim 1. According to the invention, a connection arrangement for contacting a multi-pole, in particular 3-pole, power connection with a multi-pole, in particular 3-pole, stator-side connection of an electrical machine is provided. In this case, the power connection is used to act on the electrical machine with an electrical power, with which a stator of the electric machine is supplied with power. The invention is based on the idea of providing an individually formed connection socket on each pole of the multi-pole stator-side connection. Advantageously, the fact that each pole has its own trained connection socket, any electrical machine can be equipped with such connection sockets. It is therefore no longer necessary, as known from the prior art, to design the opening in the housing of the electrical machine to the connection housing with the power connection sockets or vice versa. This results in a large structural freedom and a universal applicability of the connection arrangement according to the invention.

According to an advantageous embodiment, each connection socket is equipped with a plastic casing which electrically isolates the connection socket from the environment. It is particularly advantageous if the plastic casing is produced by a plastic extrusion.

In this case, as a further advantageous embodiment shows, the connection socket having a first power terminal side portion and a second stator side portion. Since often the structural requirements of power connection and power connection are different, a corresponding design of the connection socket is advantageous. It is preferred if the first and second sections are made integral, which is easy to implement, especially in plastic injection molded parts. Such a connector socket can then be easily positioned on the corresponding stator terminals and connected to the power connector.

According to a further advantageous embodiment, the electric machine is arranged in a housing, in particular a transmission housing of a hybrid drive. net, wherein the multi-pole stator-side terminal is accessible via a designed as a power connection box opening in the housing. In this designed as a power connection box opening the connection sockets can be arranged. It is particularly advantageous if the connection sockets are completely accommodated in the power connection box.

Furthermore, the power connection box can usually have an edge, which is formed integrally with the housing and, by design, can have an increased wall thickness in comparison to the wall thickness of the housing elsewhere. Furthermore, an intermediate plate, a so-called clamping base, which covers the electrical machine, is usually provided in the power connection box. But to provide a contact with the stator-side terminals, the clamping base is further provided with openings, which are preferably formed as a substantially round holes, and allow access to the stator-side terminals. Preferably, the connecting sockets are used in these openings on the clamping base. In this case, the second section of the connecting bush is advantageously designed such that it is adapted to the shape of the opening in the clamping base. In order to additionally provide a seal between an outer space and the electrical machine, a sealing element can furthermore be provided on the connecting bush, which seals the opening in the clamping base relative to the connecting bush and which also contributes to the electrical insulation of the connecting bushes relative to the housing or the power connection box.

According to a further advantageous embodiment, each connection socket further comprises an anti-rotation device. Since it may occur when connecting the power connection to the stator-side connection or to the connecting bush disposed thereon, that the connecting bushing is twisted, as a result of which the components, in particular the seal, can be damaged. The anti-twist device formed on the connecting bush counteracts this twisting. In this case, the rotation can be formed in particular as a formed on the plastic sheath extension. Advantageously, this extension, in particular formed on the plastic casing, engages in a receptacle provided on the power connection box, in particular on the clamping base the connection socket is fixed against rotation in the power connection box. As a result, in particular, the seal provided on the connection bush between the clamping base opening and the connecting bushing can no longer be damaged.

According to another preferred exemplary embodiment, the first, power-connection-side section of the connecting bushing has a polygonal shape, while the second, stator-side section of the connecting bushing preferably has a round shape. As a result, the round second section of the connection arrangement can be received directly by the usually round opening of the clamping base, while, for example, the angular shape can serve as an integral anti-twist device. For this purpose, preferably the angular shape of the first portion is dimensioned such that an anti-rotation of the connection socket via a contacting of an edge of the connection socket with an inner wall of the power connection box and / or an adjacent connection socket takes place.

Since in this preferred embodiment can be dispensed with the formation of an extension and the recording of the extension in a receptacle on the clamping base, the assembly is further simplified. In addition, the integral anti-twist device makes it possible, for example, to no longer damage the seal provided on the connection socket.

According to a further advantageous embodiment, the first portion of the connection socket further comprises a receiving area formed for a cable lug. For ease of mounting the power supply, the power terminals often have lugs on their ends to be connected to the connection socket, which are then electrically connected to the connection socket. The receiving area formed on the connecting bush thereby facilitates the twist-free attachment of the cable lug to the connecting bushing. In this case, the receiving area may preferably have a recess which is adapted to receive the cable lug. In order to simplify the assembly even further, the depression is preferably slightly curved in the center, in particular in the direction of the power connection, so that snagging of the cable lug in the receiving area is prevented. Further advantages and advantageous embodiments are defined in the claims, the drawings and the description.

In the following, the invention will be described in more detail with reference to embodiments illustrated in the drawings. The illustrated embodiments are purely exemplary in nature and are not intended to define the scope of the application. This is defined solely by the appended claims.

Show it:

1 shows a schematic sectional view through a power connection of an electrical machine with a first embodiment of a connection arrangement;

Fig. 2: a 90 ° offset sectional view of the embodiment shown in Figure 1;

3 shows a detailed representation of the embodiment illustrated in FIGS. 1 and 2;

4 shows a schematic representation of the embodiment of the connecting bush shown in FIGS.

Fig. 5: a schematic representation of a second embodiment of the connection socket;

6 shows a detailed representation of the embodiment shown in FIG. 5; and

7 shows a schematic representation of the embodiment shown in FIG. 5 with further details.

In the following, the same or functionally equivalent elements are identified with the same reference numerals.

FIGS. 1 and 2 each show sectional views offset by 90 ° from one another by a power connection 1 of an electric machine arranged in a motor housing 2, only one stator coil 3 (see FIG. 1) of the electric machine being shown. Furthermore, FIGS. 1 and 2 show that a power connection box 4 is formed in the motor housing 2. The power connection box 4 is integrated part of the housing 2 and has at its edge 7 terminals 6, through which a power connection 5 for a power supply of electrical power is feasible (see Fig. 1). This opening 6 forms a connection to an outside area outside the housing 2 of the electric machine.

Within the power connection box 4, a so-called clamping base 8 is arranged, which is part of the housing 2 and in which at least one opening is formed to allow access to the electrical machine. In the commonly used 3-pin connector (see in particular Fig. 2) for an electrical machine, this means that over the clamping base 8 three busbars 9a, 9b, 9c must be contacted, which in turn with associated switching rings 19, the stator 3 with Supply electricity, are connected.

For this purpose, as shown in FIG. 2 and the plan view of the clamping base 8 of FIG. 3 can be seen in the clamping base 8, three, preferably round openings formed in each of which a connection socket 10 a, 10 b and 10 c can be inserted.

The connection sockets 10a, 10b and 10c are designed as separate individual connection sockets 10. Such a single connector socket 10 is shown schematically in FIG. FIG. 4 further shows that the connecting bushing 10 has a first section, in particular an upper flange section 11, and a second section, in particular a lower sleeve section 12, the section 12 being received by the opening on the clamping base 8 and preferably a corresponding one Has outer shape design. Furthermore, a seal 13 may be provided on the second portion 12, which creates a seal between the opening in the clamping base 8 and the connecting sleeve 10 (see also Fig. 2).

Furthermore, FIGS. 1, 2 and 4 show that the connecting bush 10 is designed as a plastic-coated element with an internal current-carrying sleeve region 15 and a plastic casing 17, the plastic casing 17 providing insulation between the connecting bush 10 and the casing 2. Al Ternatively can be dispensed with the plastic casing 17 also, in which case the sealing element 13 alone takes over the insulation function.

Since usually the electrical connection of an external power unit (not shown) via cable lugs 24 fastened to cables 22 (see FIGS. 1 and 2) takes place, a receptacle 21, which is designed to receive a screw element 20, is furthermore provided on the connection bush 10, on the one hand the cable lug 24 attached to the connecting sleeve and on the other hand produces an electrically conductive connection between the cable lug 24, the sleeve 15 and the busbar 9. For this purpose, further, as shown in FIGS. 1 and 2, an electrically conductive connecting nut 23 is provided, which receives the screw 20 and establishes an electrical contact between the sleeve 15 and the busbar 9.

As can be seen in particular from FIGS. 1 and 4, an anti-rotation lock is furthermore formed on the first section 11 of the connecting bush 10, which in the exemplary embodiment shown in FIGS. 1 and 4 in the form of an extension 14 with a fastening nose 16 is trained.

Since, in particular, the connection bushing 10 can have a plastic casing 17, the extension 14 can be formed with the fastening lug 16 directly during the injection process of the plastic casing 17. The anti-rotation is thereby provided that the mounting lug 1 6 in a receptacle 18 (see FIG. 1) of the clamping base 8 is fitted and provides for a rotationally fixed connection of the connecting sleeve 10 with the clamping base 8. As a result, twisting of the connection socket 10 during attachment of the power connection by means of the screw elements 20 can be prevented. A rotation of the connecting bushing 10 during the screwing process can disadvantageously lead to damage of the sealing element 13, which in turn could lead to a leakage at the power connection box 4.

5 and 7 show a plan view of a further exemplary embodiment of the connection arrangement 1 shown in a sectional view in FIGS. 1 and 2, wherein via the cable lugs 24 and the screw elements 20 the connection cables 22 are connected to the connection. Bushings 10 are connected. In order to secure the cable lugs 24 well to the connector socket 10, the connector socket 10 may continue on its side facing the cable lug 24 have a recess in which the cable lug 24 is inserted. Of course, such a depression can also be formed on the connection bush 10 shown in FIGS. 3 and 4.

FIG. 5 further shows that the first portion 11 of the connection bushing 10 is formed in a substantially quadrangular shape, while the second portion 12 has a substantially round shape (see FIG. 6). Furthermore, FIGS. 5 and 6 show that a depression 26 is provided on the first section 11, which is designed to receive the cable lug 24 (see FIG. 7) therein. As already mentioned above, the depression 26 can also be analogous to the round configuration of the connection bushing 10, as shown in FIGS. 3 and 4.

The illustrated in Fig. 5 embodiment of the connector socket 10, which is shown in detail in Fig. 6, however, as already mentioned, in a first section 1 1 shows a quadrangular shape, while in a second section 12 has a round shape. In this case, the round shape is again formed stator side to engage in the opening in the clamping base 8, wherein the seal 13 in turn provides a seal.

The substantially quadrangular shape of the first section 1 1 ensures an integral rotation, so that it is possible to dispense with an extension 14. 5 and 6 that an anti-rotation over a corresponding dimension of the first section 1 1 in its length L and width B takes place. If the connecting bushing 10a (see FIG. 5) were to rotate during the fastening of the fastening elements 20 in the receptacle 21, an edge 32 or 34 of the connecting bush 10 would abut against an inner wall 36 of the power connection box 4 or on the adjacent connecting bush 10b, as a result of which rotation is prevented.

Furthermore, FIGS. 5 and 6 show that the connecting bushing 10 has an insertion rail 38 which facilitates a reception of a cable lug (see FIG. 7) in the connecting bushing 10. At the same time, the depression 26 can Terminal connection have slightly curved shape through which, despite the manufacturing tolerances, the cable lug 24 can be easily received in the connector socket 10 and held against rotation.

FIG. 7 shows the situation from FIG. 5 with connection cables 22 connected, the cable lug 24 being accommodated in the connection socket 10. In this case, the quadrangular configuration of the connecting bushing, as shown in FIGS. 5 to 7, makes it possible to dispense with an additional anti-twist device, so that the assembly is further simplified. In this case, the dimensioning of the connection sockets 10 can be configured such that as many different power connection boxes 4 as possible can be equipped with an identically designed connection socket 10.

Overall, the configuration of the connection arrangement 1 with separate connection sockets 10 enables universal use in a large number of power connection boxes 4. This advantageously simplifies installation and no longer requires individually adapted connection units. In addition, the connection socket 10 has an anti-rotation device, which reliably prevents damage to the seal 13.

Designation connection arrangement

Housing of an electrical machine

stator

Leistungsanschlussbox

power connection

Power connection opening

Edge of the power connection box

pinch ground

conductor rail

connection socket

first section of the connection socket second section of the connection socket seal

extension

Sleeve section of the connection socket attachment nose

Plastic sheathing of the connection socket. Recording in the clamping base

switching ring

fastener

Mounting for the fastening element Connecting cable

fixing nut

lug

admission

first edge of the connection socket

second edge of the connection socket

Inner wall of the power connection box

Claims

claims

1 . Connecting arrangement (1) for contacting a multi-pole, in particular 3-pole, power connection for applying an electrical machine with a power with a multi-pole, in particular 3-pole, stator-side connection of the electric machine, characterized in that at each pole of the multi-pole stator-side terminal individually formed connection socket (10) is provided.

2. Connecting arrangement (1) according to claim 1, wherein each connecting bush (10) comprises a current-carrying sleeve portion (15) on which a plastic sheathing (17) is formed, wherein preferably the connecting bush (10) is plastic encapsulated.

3. Connection arrangement (1) according to claim 1 or 2, wherein the connecting bush (10) has a first power connection facing the first portion (1 1) and a second stator facing the second portion (12).

4. Connecting arrangement (1) according to one of the preceding claims, wherein the electric machine in a housing (2), in particular a transmission housing of a hybrid drive, is arranged, and the multi-pole stator-side connection as a power connection box (4) formed opening in the housing (2) is accessible, wherein preferably the power connection box (4) has a clamping base (8) for receiving the connecting sockets (10).

A connection assembly (1) according to claim 4, wherein the clamping base has at least one opening adapted to receive a single connection socket (10), in particular the second portion (12) of the connection socket (10).

6. Connecting arrangement (1) according to one of the preceding claims, wherein the connecting bush (10) further comprises a rotation.

7. Connecting arrangement (1) according to claim 6, wherein the rotation against over at least one on the connecting sleeve (10), in particular on the plastic casing, formed extension (14) is formed.

8. Connecting arrangement (1) according to claim 7, wherein the projection (14) of the anti-rotation device is further adapted to be in a receptacle (18) on the housing (2) of the electric machine, in particular in a receptacle (18) on the clamping base (8). the power connection box (4) to be recorded.

9. Connecting arrangement (1) according to one of the preceding claims, wherein the connecting bush (10) has a polygonal, in particular quadrangular shape, wherein preferably the first portion (1 1) has the angular shape, and the second portion (12) preferably a round Form has.

10. Connecting arrangement (1) according to claim 9, wherein the angular shape is dimensioned such that an anti-rotation of the connecting bush (10) via contacting an edge (32; 34) of the connecting bush (10) with an inner wall (36) of the power connection box ( 4) and / or an adjacent connection socket (10).

1 1. Connecting arrangement (1) according to one of claims 3 to 10, wherein the first portion (1 1) further comprises a for a cable shoe (24) formed power port (22) formed receiving portion (26).

12. Connecting arrangement (1) according to claim 1 1, wherein the receiving region (26) has a recess (26), which preferably has a curved in the direction of power connection (22) shape.

13. Connecting arrangement (1) according to one of the preceding claims, wherein the connecting bush (10) on the stator side, in particular on the second section (12), a sealing element (13).

14. Connecting arrangement (1) according to claim 13, wherein the connecting bushing has a current-carrying sleeve section (15) on which the sealing element (13) is arranged directly, so that the sealing element (13) isolates the connecting bush (10) from the housing (13). 2) of the electric machine is formed.