CN112240338B

CN112240338B - Connecting assembly

Info

Publication number: CN112240338B
Application number: CN202010691777.2A
Authority: CN
Inventors: S·乔治斯; F·科尔策
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2019-07-17
Filing date: 2020-07-17
Publication date: 2022-08-09
Anticipated expiration: 2040-07-17
Also published as: CN112240338A; DE102019210561A1

Abstract

The invention relates to a connecting assembly (1) having a connecting element (2) and a connecting strap (3) connected to the connecting element by means of at least one fastening means, wherein the connecting element and the connecting strap at least partially overlap in the longitudinal direction (L) thereof and the connecting element is rotationally fixed by means of at least one rotation-blocking element (4). The first fastening means is furthermore a threaded fastener (5) having a threaded fastener head (6) and a threaded fastener shank (7), wherein the connecting element, which is more closely spaced apart from the threaded fastener head, is either directly supported in a rotationally fixed manner by means of a second fastening means, which interacts with the threaded fastener (5), in the form of a nut (8), which in addition forms a rotational stop element (4), or the connecting element (2) is engaged or placed by means of the rotational stop element (4) in or at a fixedly arranged connection strap (3).

Description

Connecting assembly

Technical Field

The invention relates to a connecting assembly having a connecting element and a connecting strap connected to the connecting element by at least one fastening means. The connecting element and the connecting strap overlap at least partially in their longitudinal direction, the connecting element being rotationally fixed by at least one rotation-blocking element.

Background

In order to transfer and/or output electrical energy from the energy source to the electric machine, in particular to the electric motor, it is necessary to switch on the stator of the electric machine. This is often achieved by a screw connection (verschrauung, sometimes referred to as connection with a threaded fastener) of an electrical line, which is particularly flexible and accordingly projects from the stator, to the busbar (Stromschiene). The respective bus bar-facing ends of the electrical lines are usually embodied with cable lugs (Kabelschuh, sometimes referred to as cable terminal sleeves).

In addition to the torque of the actual screw connection, in the context of a screw connection of a cable lug and a busbar, there occurs a torque which is caused by the so-called screw head under friction (unterkopfreshuang) which is determined by the screw pretensioning (schraubenvorrspankurft) and the coefficient of friction between the screw head and the abutting abutment of the screw head, in particular the cable lug.

The torque occurring by the friction of the lower head of the threaded fastener or likewise the lower head of the threaded fastener causes the cable lug to rotate together and thus an undefined position of the cable lug is present, which can even lead to damage of the stator being joined.

For this reason, the cable lug, which in particular acts as a bearing lug for the threaded fastener, optionally also the busbar, must be fixed during the screwing process and/or the torque produced by the occurring friction under the head of the threaded fastener must be supported accordingly.

Rotational locking is known in various embodiments and technical fields.

A method and a fastening assembly for fastening a first vehicle body part to a second vehicle body part are known, for example, from EP 2857700B 1. The fastening takes place using a clip nut (Clipmutter) which is inserted into a rectangular receptacle of the second vehicle component and whose latching arms, each having a latching receptacle (Rastaufnahme) and being elastically connected, pass through an likewise rectangular recess of the first vehicle component. Due to the rectangular design, the clamping nut is mounted in a rotationally fixed manner, wherein the locking receptacle of the locking arm engages in a form-fitting manner in a wall of the first body part. For additional fixing, the threaded fastener, which is in contact with the second body part on the rear side of the receptacle, acts into the internal thread of the clamping nut and, in addition, exerts a force on the latching arms, directed toward the wall, via its threaded fastener shaft.

DE 8914065U 1 furthermore discloses a connecting assembly for connecting two components, wherein the components are connected by means of a threaded fastener and a rectangular nut and the connection is achieved with the aid of a connecting element having four legs, which is embodied as elastic. One of the legs has two tongues, in which a rectangular nut is locked in a rotationally fixed manner by a groove formed around the nut. By tightening a threaded fastener engaged into the nut, which is captured in the legs, enters into an opening embodied in the part facing the nut, wherein the legs rest against the part and the dosed abutment force between the parts can be adjusted.

Furthermore, an anti-rotation connection of a cable lug to a receiving body is known from DE 102015011695 a1, wherein the receiving body itself and thus the cable lug can be fixed to a metal body by means of a pin. For this purpose, the receiving body has, on the one hand, a recess for a form-fitting surrounding of the bolt and, on the other hand, a receiving region for a standard cable lug. The receiving region here corresponds to the contour of the cable lug and is thus formed with a recess with a semicircular section and an adjoining linear section.

Disadvantageously, however, all designs have in common a relatively complex construction with a plurality of structural elements. The structural elements must be mounted precisely, partially to each other, with small tolerances, which makes the mounting extremely complicated.

Disclosure of Invention

Against this background, the object of the invention is to implement a connecting assembly of the type mentioned at the outset in such a way that the assembly is simplified.

This task is solved with the connecting assembly described below.

In accordance with the invention, therefore, an especially electrical connection assembly is provided, which has a connection element (in this case especially a cable lug) which closes off an electrical conductor, especially on the end face, and an especially electrically conductive connection strap (preferably a busbar) which is connected to the connection element by at least one fastening means.

Furthermore, it is provided according to the invention that the first fastening device is a threaded fastener with a threaded fastener head and a threaded fastener shank. Furthermore, the connecting element and the connecting strap at least partially overlap in their longitudinal direction and at least the connecting element is furthermore made rotationally fixed by at least one rotation-blocking element. In this case, the connecting element, which is spaced further apart from the threaded fastener head or in particular bears against the threaded fastener head, is either directly supported in a rotationally fixed manner by a second fastening means interacting with the threaded fastener in the form of a nut (which additionally forms a rotational locking element) or is engaged or bears by the rotational locking element into or against a fixedly arranged connection strap. In both basic embodiments, on the one hand, the incorporation of a plurality of functions in the nut and, on the other hand, the simplified design of the connecting element make it possible to mount the connecting element in a simplified manner.

Furthermore, a lower torque of the threaded fastener head, which acts on the connecting element when the threaded fastener is fastened or unfastened, is transmitted on the one hand via the nut designed as a rotation-blocking element and subsequently indirectly or directly from the nut to the stationary component. Such a stationary structural element can be, for example, a body part or an insulator, in particular connected to the body of a motor vehicle. One embodiment of such an insulator can be located in the contact bridge, which is made of plastic, for example. In this case, it is furthermore possible not only to design the connecting element and the connecting strap substantially rigid, but also to design at least one of them, preferably the connecting element, to be flexible. On the other hand, the lower torque of the head of the threaded fastener is first transmitted via the rotation-blocking element into the clutch partner, which is itself arranged in a stationary manner and is of substantially rigid design. It is important here, however, that the connection element is designed to be flexible, which is provided, for example, when the electrical conductor is embodied as a stranded conductor (Litzenleiter).

In a particularly advantageous development of the invention, the nut has a nut shank, a nut head and an internal thread which is formed centrally and is accessible at least toward the connecting element. The nut should therefore not be implemented in the sense of a conventional nut, but rather in principle have the shape of a threaded fastener. The nut stem is formed less wide than the nut head. It is conceivable here to support the connecting element in a rotationally fixed manner by means of a nut head, wherein the nut itself is arranged in a rotationally fixed manner by means of its nut shank in a stationary structural element and thus a lower torque of the head of the threaded fastener acting on the connecting element can be transmitted to the stationary component. In order to make it possible to arrange the nut in a rotationally fixed manner by means of the nut shank, the nut shank should have a rotationally fixed cross section. The cross section of the nut stem can have, for example, a rectangular shape, a triangular shape, a hexagonal shape, an octagonal shape or a polygonal shape, in particular a star shape, or even an oval shape.

It is also advantageous for the form-fitting section of the nut head or the nut head to engage in a rotationally fixed form-fit manner in a form-fitting recess of the connecting element, which recess cooperates with the form-fitting section or the nut head and is formed in the same shape. This offers the possibility in a relatively simple manner of transmitting the underhead torque of the threaded fastener acting on the connecting element to the nut, wherein the connecting element (here the form-fitting section of the engagement-form recess of the nut) must have a cross-sectional shape which makes it possible to transmit the underhead torque of the threaded fastener and thus prevents a rotation of the connecting element. Here, for example, a rectangular, triangular, hexagonal, octagonal or polygonal, even oval cross section of the form-fitting section of the nut head and thus of the form recess of the same connecting element formed in the same shape is conceivable.

In a further useful embodiment of the invention, the nut head has a flat bearing section which is configured orthogonally to the central longitudinal axis of the nut and at least two side walls which are formed perpendicularly from the bearing section and thus extend in the direction of the central longitudinal axis and are arranged in the region of the head periphery. Thereby, an additional possibility of transferring the lower-head torque of the threaded fastener to the nut is achieved.

In addition, an embodiment of the invention proves to be valuable if the nut is arranged in a rotationally fixed manner by its nut shank, but is nevertheless longitudinally displaceable in the contact bridge of the connecting assembly. On the one hand, the nut itself is arranged in a rotationally fixed manner in the contact bridge via its nut shank, and the lower torque of the head of the threaded fastener, which acts on the connecting element as a result, can be transmitted to the contact bridge, so that the connecting element can be supported in a rotationally fixed manner by the nut head. The contact bridge is arranged in a stationary manner, wherein the contact bridge can be part of one or more connecting assemblies and is used essentially for coupling an electric machine, in particular an electric motor of a motor vehicle, to an energy source and/or an energy sink (energy trap). The energy source and/or the energy sink can be embodied here, for example, as a battery or a plurality of batteries or even as a pulse inverter. It is conceivable to thereby couple the phases of the electric machine to the energy source and/or the energy sink by means of the contact bridges using a connecting assembly for each phase.

A design of the invention can also be seen to be advantageous in that the side walls laterally enclose the connecting element, wherein the lateral surfaces of the connecting element rest against the inside of the side walls in a rotationally fixed manner. This offers the advantage, for example, that the connecting element does not have to be structurally weakened by shaping a shaped recess in the connecting element, but rather the connecting element merely bears with its side against the side wall of the nut head and nevertheless ensures a rotationally fixed support. The applied lower torque of the threaded fastener head can thus be transmitted from the connecting element via the side wall to the nut head and thus to the nut and via the nut shank into the stationary structural element (e.g. the contact bridge). The rotation-blocking element is in this case in contact with its side face, respectively, transversely to the central longitudinal axis of the nut, on the inner side of the side wall, while the connection strap is not in contact with the side wall or only in contact with the side wall. However, in order to fix the connection strap to the connecting element by means of the nut and the threaded fastener, the connection strap rests on the bearing section in the direction of the central longitudinal axis of the nut.

In a further, highly advantageous development of the invention, the rotation-blocking element is formed in a cylindrical manner, in particular as a pin, in particular a positive-locking connection element and a connection strap, and supports the connection element in a rotationally fixed manner on the connection strap in cooperation with the threaded fastener shank. This is an advantageously simple embodiment of the rotation-blocking element, wherein the rotationally fixed support of the connecting element by the connecting strap must be realized by virtue of the cylindrical design of the rotation-blocking element in cooperation with the threaded fastener shank of the threaded fastener. The cylindrical rotation-blocking element can be designed as a separate component or can be formed on the connecting element or on the connecting strap. For connecting the connecting element and the connecting strap, the rotation-blocking element furthermore engages in an engagement opening formed in the connecting strap or the connecting element.

It can also be seen as advantageous if the rotation-blocking element is formed in two parts as a square lateral stop which is formed in the longitudinal direction at least partially over the length of the connecting element or of the connecting strap and laterally surrounds the connecting strap or the connecting element and thereby supports the connecting element in a rotationally fixed manner. In such a configuration for the rotation-blocking element, the engagement opening advantageously does not have to be introduced into the connecting element or into the connecting strap, so that there is no mechanical weakening of the same. Furthermore, due to the fact that the torque can be distributed to the lateral stops on both sides of the profiled thread fastener head, the mechanical load on the respective lateral stop is reduced.

It is also valuable that the rotation-blocking element is a square transverse stop which is shaped in the transverse direction at least partially across the width of the connecting element or of the connecting strap, against which the connecting strap or connecting element bears at the end and thereby supports the connecting element in a rotationally fixed manner, in particular in cooperation with the threaded fastener shank. This proves to be advantageous if, for example, the width of the connecting element or of the connecting strap can be designed to be the same compared to the lateral stop being formed at the connecting element or the connecting strap. This is particularly useful in situations where the installation space is limited.

It can also be considered to be particularly useful if the rotation stop element is formed in one piece on the connecting element or on the connecting strap. This can simplify the installation of the connecting element and/or the connecting strap into the connecting assembly in a practical manner.

Drawings

The invention allows a large number of embodiments. For further explanation of the basic principle of the embodiments, some of them are shown in the drawings and described below. In the drawings:

fig. 1a,1b show a first modified version of a connecting assembly in a very simplified view;

fig. 2a to 2c show a first modified version of the connecting assembly in perspective view;

fig. 3 shows three connecting assemblies in different installation states;

fig. 4 shows an embodiment of a form-fitting section and a form recess;

figures 5a to 5d show a second modified version of the connection assembly;

figures 6a,6b show a third modification of the connection assembly;

figures 7a,7b show a fourth modified version of the connection assembly;

figures 8a,8b show a fifth modification of the connection assembly;

fig. 9a,9b show a sixth modification of the connecting assembly.

Detailed Description

Fig. 1a,1b,2a to 2c and 3 and 4 show a first development of a connecting assembly 1. The connecting assembly 1 has a connecting element 2 in the form of a cable lug and a connecting strap 3 which is connected to the connecting element 2 by a fastening device and is in the form of a busbar, wherein the connecting element 2 and the connecting strap 3 partially overlap in their longitudinal direction L. The first fastening means by which the connecting element 2 is connected to the connecting strap 3 is here a threaded fastener 5, which threaded fastener 5 has its threaded fastener head 6 and its threaded fastener shank 7. The connecting element 2, which is here more closely spaced from the screw fastener head 6 and which furthermore bears directly against the screw fastener head 6, is here supported in a rotationally fixed manner directly by a second fixing device in the form of a nut 8 (which furthermore forms the rotation-blocking element 4) which interacts with the screw fastener 5. The nut 8 itself has a nut shank 9, a nut head 10 and an internal thread which is formed centrally and is accessible toward the connecting element 2, wherein the internal thread passes completely through the nut 8 and the threaded fastener shank 7 engages into the internal thread. In order to support the connecting element 2 in a rotationally fixed manner, the nut head 10 has a form-fitting section 11 which engages in a rotationally fixed manner in a form-fitting recess 12 of the connecting element 2 formed in the same shape and interacting with the form-fitting section 11 of the nut head 10. The positive-locking section 11 passes through a recess 18 in the connecting strap 3, wherein the recess 18 is of widened design such that the connecting strap 3 does not come into contact with the positive-locking section 11 transversely to the central longitudinal axis M of the nut 8. The connecting strap 3, however, rests on the bearing section 13 of the nut head 10 in the direction of the central longitudinal axis M.

In addition to the rectangular cross section of the form-fitting portion 11, which can be seen from fig. 1a, further possible cross-sectional shapes of the form-fitting portion 11 can be seen from fig. 4, wherein the form-fitting portion 11 is shaped to form a triangle, a hexagon, an octagon or a polygon, or even an ellipse. The respective shape recesses 12 of the connecting element 2 are correspondingly formed in the same shape. All the cross-sectional shapes shown here are suitable for preventing a rotation of the connecting element 2.

Fig. 2a to 2c also show that the nut 8 is arranged in a rotationally fixed, yet longitudinally displaceable manner in the contact bridge 15 of the connecting assembly 1 by means of its nut shank 9, wherein these figures show the fixing process by means of the threaded fastener 5 and the nut 8. In fig. 2a, the threaded fastener 5 has not yet been engaged in the internal thread of the nut 8. The positive-fit section 11 also has not yet passed through the recess 18 and therefore likewise has not yet engaged into the positive-fit recess 12, which shows the starting point when the connecting element 2 and the connection strap 3 are fixed. Fig. 2b then illustrates the engagement of the threaded fastener 5, in particular the threaded fastener shank 7, into the internal thread of the nut 8, wherein the nut is held in its starting position in the contact bridge 15. As a result of the rotationally fixed, but longitudinally displaceable arrangement of the nut shank 9 in the contact bridge 15, a displacement of the nut 8 along the central longitudinal axis M in the direction of the threaded fastener head 6 and thus in the direction of the connecting element 2 and the connecting strap 3 occurs when the threaded fastener 5 is tightened. The form-fitting section 11 is in this case passed through the recess 18 and then positively engaged in a rotationally fixed manner into the form-fitting recess 12, whereby the connecting element 2 is supported in a rotationally fixed manner in the contact bridge 15 by the nut 8, in particular the nut shank 9. In this position, the connection strap 3 finally rests on the bearing section 13 of the nut head 10. This final position of the nut 8 is shown in fig. 2 c.

Fig. 3 shows a group of three connecting assemblies 1, wherein the sequence of the assembly of the connecting assemblies 1 is known from this figure. The left-hand connection module of the three connection modules 1 is only designed with the connection strap 3 and the nut 8 in the installed state that can be seen in this figure, the nut 8 being located in the contact bridge 15. This is shown in the middle connection module 1 in the illustration and in the second view, immediately before the connection element 2 is positioned in the illustration in the view plane (Sichtebene) to the connection strap 3. As can be seen from the right-hand illustration of the connection assembly 1, the connection of the connection element 2 to the connection strap 3 is then carried out by means of the threaded fastener 5 and the nut 8.

Fig. 5a to 5d show a second embodiment of the connecting assembly 1, and even a nut 8. Fig. 5a and 5b show a very simplified sectional view and a top view of the connecting assembly 1, and fig. 5c shows a perspective view of the connecting assembly 1. In the case of the connecting assembly 1, the nut head 10 has a flat support section 13 which is formed so as to be orthogonal to the central longitudinal axis M of the nut 8, and two side walls 14 which are formed so as to extend perpendicularly from the support section 13 and are arranged in the region of the head periphery. The side wall 14 laterally encloses the connecting element 2, wherein the side of the connecting element 2 rests against the inside of the side wall 14 in a rotationally fixed manner. The connecting strap 3 then rests on the support section 13, wherein the connecting strap 3 rests only on one side on the side wall transversely to the central longitudinal axis M. The nut shank 9, by means of which the nut 8 is arranged in a rotationally fixed manner, but longitudinally displaceable manner, in the contact bridge 15 of the connecting assembly 1, has a polygonal cross section for the purpose of rotational locking.

Fig. 6a and 6b furthermore show a third embodiment of the connecting assembly 1, and fig. 7a and 7b show a fourth embodiment of the connecting assembly 1. Fig. 6a and 7a show a cross-sectional view and fig. 6b and 7b show a top view, again very simply for the respective connecting assembly 1. The connecting assembly 1 likewise has a connecting element 2 and a connecting strap 3 which is connected to the connecting element 2 by means of a fastening device in the form of a threaded fastener 5. The connecting element 2 and the connecting strap 3 partially overlap in their longitudinal direction L and the connecting element 2 is made rotationally fixed by a rotation-blocking element 4 in the form of a pin. The threaded fastener 5 has a threaded fastener head 6 and a threaded fastener shank 7, wherein the connecting element 2, which is spaced further apart from the threaded fastener head 6, is engaged by means of the rotation-blocking element 4 into the fixedly arranged connection strap 3, in this case is supported in a rotationally fixed manner in an engagement opening 19 formed in the middle of the connection strap 3. The rotation-blocking element 4 here forms a cylindrical connecting element 2 and a connecting strap 3 in both connecting assemblies and supports the connecting element 2 in a rotationally fixed manner on the connecting strap 3 in cooperation with the threaded fastener shank 7. The modification of fig. 6a,6b differs only in that the rotation-blocking element 4, which is designed as a pin, is embodied separately in the modification of fig. 6a,6b, wherein the rotation-blocking element 4 is formed in one piece on the connecting element 2 in the modification of fig. 7a,7 b.

A fifth embodiment of the connecting assembly 1, which is again shown in a very simplified sectional and plan view in fig. 8a and 8b, discloses a rotation-blocking element 4, wherein the rotation-blocking element 4 is designed in two parts as a square lateral stop 16 formed across the length of the connecting strap 2 in the longitudinal direction L, which laterally surrounds the connecting strap 3 and thereby supports the connecting element 2 in a rotationally fixed manner.

In a sixth embodiment of the connecting assembly 1 disclosed in fig. 9a and 9b, which is also shown very simplified in cross-sectional view and plan view, a rotation stop 4 is used, which is a square transverse stop 17 formed across the width of the connecting strap 2 in the transverse direction Q, at which the connecting strap 3 rests on the end side and the connecting element 2 is thereby supported in a rotationally fixed manner due to the positionally fixed arrangement of the connecting strap 3.

List of reference numerals

1 connecting assembly

2 connecting element

3 connecting part

4 rotation stop element

5 threaded fastener

6 screw fastener head

7 threaded fastener rod

8 nut

9 nut rod

10 nut head

11 form-fitting section

12 shaped recess

13 support section

14 side wall

15 contact bridge

16 lateral stop

17 lateral stop

18 recess

19 engaging opening

L longitudinal direction

M middle longitudinal axis

Q transverse direction

Claims

1. Connection assembly (1) having a connection element (2) and a connection strap (3) which is connected to the connection element (2) by means of at least one fastening means, wherein the connection element (2) and the connection strap (3) at least partially overlap in their longitudinal direction (L) and the connection element (2) is rotationally fixed by means of at least one rotation-blocking element (4), characterized in that a first fastening means of the at least one fastening means is a threaded fastener (5) having a threaded fastener head (6) and a threaded fastener shank (7), in which case a second fastening means of the at least one fastening means, which is rotationally fixed in comparison to the connection strap (3) is spaced less far from the threaded fastener head (6) or directly by means of a nut (8) which interacts with the threaded fastener (5) in order to additionally form the rotation-blocking element (4), is rotationally fixed The connecting element (2) is either engaged or supported in a rotationally fixed manner by means of the rotation-blocking element (4) at the fixedly arranged connecting strap (3).

2. A connecting assembly (1) according to claim 1, characterised in that the nut (8) has a nut shank (9), a nut head (10) and a centrally configured internal thread which is accessible at least towards the connecting element (2).

3. A connection assembly (1) according to claim 1 or 2, characterised in that the nut head (10) is positively engaged in a rotationally fixed manner into a identically shaped recess (12) of the connection element (2) which co-acts with the nut head (10).

4. A connection assembly (1) according to claim 1 or 2, characterized in that the nut head (10) has a flat bearing section (13) configured orthogonally to the central longitudinal axis (M) of the nut (8) and at least two side walls (14) shaped perpendicularly extending from the bearing section (13) and arranged in the region of the periphery of the nut head (10).

5. A connecting assembly (1) according to claim 1 or 2, characterized in that the nut (8) is arranged with its nut shank (9) with form fit in a rotationally fixed, yet longitudinally displaceable manner in a contact bridge (15) of the connecting assembly (1), wherein the contact bridge serves for coupling an electric motor to an energy source and/or an energy sink.

6. A connecting assembly (1) according to claim 4, characterised in that the side walls (14) laterally enclose the connecting element (2), wherein the sides of the connecting element (2) rest against the inside of the side walls (14) in an anti-rotation manner.

7. A connection assembly (1) according to claim 1 or 2, characterized in that the rotation-blocking element (4) is constructed in two parts as a square lateral stop (16) which is shaped in the longitudinal direction (L) at least partially over the length of the connection element (2) or the connection strap (3), wherein the lateral stop (16) laterally surrounds the connection strap (3) or the connection element (2) and thereby supports the connection element (2) in a rotation-proof manner.

8. A connecting assembly (1) according to claim 1 or 2, characterised in that the rotation-blocking element (4) is a square transverse stop (17) shaped in the transverse direction (Q) at least partially across the width of the connecting element (2) or the connecting strap (3), the connecting strap (3) or the connecting element (2) abutting at the end face at the transverse stop (17) and thereby rotationally supporting the connecting element (2).

9. A connecting assembly (1) according to claim 1 or 2, characterized in that the rotation stop element (4) is formed in one piece at the connecting element (2) or the connecting strap (3).

10. A connection assembly (1) according to claim 3, characterised in that a form-fitting section (11) of the nut head (10) engages in a form-fitting manner in a rotationally fixed manner into a form-recess (12) of the connection element (2) co-acting with the form-fitting section (11) formed in the same shape.