DE102019210561A1 - Connection arrangement - Google Patents

Abstract

The invention relates to a connection arrangement (1) comprising a connection element (2) and a connection partner (3) connected to the connection element (2) via at least one fastening means, the connection element (2) and connection partner (3) at least at least in their longitudinal direction (L) partially overlap and the connecting element (2) is designed to prevent rotation via at least one anti-rotation element (4). In addition, a first fastening means is a screw (5) with a screw head (6) and screw shaft (7), the connecting element (2), which is less spaced apart from the screw head (6), either directly via a second fastening means in the form of a cooperating with the screw (5) a nut (8), which also forms the anti-rotation element (4), is supported against rotation, or the connecting element (2) is supported against rotation by engagement or abutment of the anti-rotation element (4) in or on the fixed connection partner (3).

Description

The invention relates to a connection arrangement having a connection element and a connection partner connected to the connection element via at least one fastening means. Here, the connection element and connection partner at least partially overlap in their longitudinal direction, the connection element being designed to be non-rotatable via at least one anti-rotation element.

In order to supply and / or discharge electrical energy from an energy source to an electrical machine, in particular an electrical motor, it is necessary to make contact with the stator of the electrical machine. This is done regularly by screwing in particular flexible power lines, which accordingly extend from the stator, to a power rail. The respective end of the power lines facing the power rail is usually designed with a cable lug.

As part of the screw connection of the cable lug and busbar, in addition to the torque of the actual screw connection, a torque occurs due to so-called underhead friction, which is caused by the screw pretensioning force and the coefficient of friction between the screw head and the contact partner of the screw head, in particular the cable lug.

The torque occurring due to the under-head friction or also under-head torque causes the cable lug to rotate with it and thus there is no defined position of it, which can lead to damage to the connected stator.

For this reason, in particular the cable lug that acts as the support partner of the screw, optionally also a busbar, must be fixed during the screwing process and / or the torque resulting from the underhead friction must be supported.

Rotation locks are known in different embodiments and technical areas.

The EP 2 857 700 B1 For example, a method and a fastening arrangement for fastening a first body part to a second body part can be found. The fastening is done using a clip nut, which is inserted into a rectangular receptacle of the second body part, and whose latching arms each having a latching receptacle and resiliently connected extend through a likewise rectangular recess of the first body part. Due to the rectangular configuration, the clip nut is mounted so that it cannot rotate, the locking receptacles of the locking arms engaging in the wall of the first body part with a positive fit. For further fastening, a screw resting on the rear of the receptacle on the second body part engages in an internal thread of the clip nut and, via its screw shaft, also exerts a force on the locking arms directed towards the wall.

Through the DE 8 914 065 U1 a connection arrangement for connecting two components is also disclosed, the parts being connected by means of a screw and a rectangular nut and this connection being realized with the aid of a spring-loaded connecting element having four legs. One of the legs here has two tongues in which the rectangular nut is held in a rotationally secure manner by means of a groove formed around the nut. By tightening the screw engaging the nut, the nut held in the leg enters an opening which is made in the part facing the nut, the leg rests against the part and a metered contact pressure between the parts can be set.

Moreover, the DE 10 2015 011 695 A1 a twist-proof connection of a cable lug with a receiving body can be seen, whereby the receiving body itself and thus the cable lug can be fastened to a metallic body via a bolt. For this purpose, the receiving body has, on the one hand, a recess for the form-fitting enclosing of the bolt and, on the other hand, a receiving area for the standard cable lug. The receiving area here corresponds to the contour of the cable lug and is thus deepened, with a semicircular section and an adjoining, linear section.

However, disadvantageously all of these configurations have in common a comparatively complex structure with a large number of components. These have to be assembled precisely, sometimes with low tolerances, which makes this assembly extremely complicated.

Against this background, the invention is based on the object of designing the connecting arrangement of the type mentioned at the beginning in such a way that assembly is simplified.

This object is achieved with a connecting arrangement according to the features of claim 1. The subclaims relate to particularly expedient developments of the invention.

According to the invention, a - in particular electrical - connection arrangement is provided, which has a connection element, in particular a cable lug, which terminates an electrical conductor at the end, and a connection partner, preferably a busbar, connected to the connection element via at least one fastening means, in particular an electrically conductive connection. Such a cable lug can be a standard cable lug, the electrical conductor and the cable lug being formed separately from one another and connected to one another. However, it is also also conceivable that the cable lug is shaped by compacting a part, in particular one end of the electrical conductor, wherein the electrical conductor should preferably consist of a large number of individual strands twisted together.

According to the invention it is further provided that a first fastening means is a screw with a screw head and screw shaft. In addition, the connection element and connection partner at least partially overlap in their longitudinal direction and - at least - the connection element is also designed to be non-rotatable via at least one anti-rotation element. Here, the connecting element, which is less spaced apart from the screw head - or in particular resting on the screw head - is either directly supported against rotation via a second fastening means in the form of a nut which interacts with the screw and which also forms the anti-rotation element, or the connecting element is secured against rotation by engagement or contact of the anti-rotation element the or on the fixedly arranged connection partner supported against rotation. In both basic configurations, a simplified assembly of the connection arrangement is made possible here, on the one hand due to the merging of several functions in the nut, and on the other hand by simplifying the structural design of the connecting arrangement.

In addition, an underhead torque acting on the connecting element when fastening or loosening the screw would be transmitted, on the one hand, via the nut designed as an anti-rotation element and then indirectly or directly from the nut to a fixed component. Such a positionally fixed component could for example be a body part or in particular an insulator connected to the body of a motor vehicle. An embodiment of such an isolator could be in a z. B. are made of plastic contact bridge. In this case, there would also be the possibility of designing the connecting element and the connecting partner essentially rigidly as well as the possibility of designing at least one of these, preferably the connecting element, flexibly. On the other hand, the under-head torque would initially be transmitted via the anti-rotation element to the connection partner, which for this purpose would be arranged in a fixed position and would be essentially rigid. In this respect, however, it would be important that the connecting element is designed to be flexible, which would be the case, for example, if the electrical conductor were designed as a stranded conductor.

In a particularly advantageous development of the invention, the nut has a mother shaft, a nut head and a centrally formed internal thread that is accessible at least towards the connecting element. The nut should therefore not be designed in the sense of a classic nut, but in principle rather have the shape of a screw. Accordingly, the motherhood would be less broad than the mother's head. It is conceivable that the connecting element is supported against rotation via the nut head, the nut itself being non-rotatably arranged via its mother shaft in a fixed component and thus the underhead torque acting on the connecting element can be transmitted to this fixed component. To enable a non-rotatable arrangement of the nut over the mother shaft, it should have a cross section which prevents twisting. This cross section of the motherhood can, for example, have a rectangular, triangular, hexagonal, octagonal or polygonal shape, in particular a star shape or an elliptical shape.

In addition, it is also advantageous if a form-fit section of the nut head or the nut head engages in a non-rotatably form-fitting manner in an identically shaped recess of the connecting element that interacts with the form-fit section or the nut head. In a comparatively simple manner, this offers the possibility of transmitting an underhead torque acting on the connecting element to the nut, whereby the connecting element, in this case the form-fit section of the nut engaging the molded recess, must have a cross-sectional shape that enables the underhead torque to be transmitted and thus twisting of the connecting element prevented. It is conceivable here for. B. a rectangular, triangular, hexagonal, octagonal or polygonal, or elliptical cross-section of the interlocking section of the nut head and thus also of the shaped recess of the connecting element.

In a further advantageous embodiment of the invention, the nut head has a flat support section normal to the central longitudinal axis of the nut and at least two extending perpendicularly from this support section - and thus in the direction of the central longitudinal axis - and arranged in the area of the head circumference Sidewalls on. In this way, another possibility for transmitting the under-head torque to the nut can be implemented.

An embodiment of the invention also turns out to be very promising when the mother is arranged in a contact bridge of the connecting arrangement in a form-fitting manner, non-rotatable, but longitudinally displaceable via its mother shaft. In this way, on the one hand, the connecting element could be supported non-rotatably via the nut head, in that the nut itself is non-rotatably arranged in the contact bridge via its mother shaft and thus the underhead torque acting on the connecting element can be transmitted to the contact bridge. The contact bridge is arranged in a fixed position, it being part of one or more connection arrangements and basically serving to connect an electrical machine, in particular an electric motor of a motor vehicle, to an energy source and / or sink. The energy source and / or sink can be designed, for example, as an accumulator or several accumulators or even as a pulse inverter. It is conceivable that the phases of an electrical machine are thus connected to the energy source and / or sink via the contact bridge using one connection arrangement per phase.

An embodiment of the invention can also be characterized as advantageous in that the side cheeks encompass the connecting element laterally, with side surfaces of the connecting element resting against the inner sides of the side cheeks in a non-rotatable manner. This offers e.g. B. the advantage that the connecting element would not have to be structurally weakened by forming the recess in the connecting element, but this only rests on its side surfaces on the side cheeks of the nut head and a non-rotating support can still be guaranteed. The acting underhead torque can thus be transmitted from the connecting element via the side cheeks to the nut head and thus the nut and via the mother shaft to a fixed component, for example the contact bridge. In this case, the anti-rotation element lies with its side surfaces correspondingly transversely to the central longitudinal axis of the nut on the inner sides of the side cheeks, while the connection partner should not be in contact or only against one side cheek. To fasten the connection partner with the connection element via the nut and the screw, however, the connection partner would rest on the support section in the direction of the central longitudinal axis of the nut.

In a further extremely advantageous development of the invention, the anti-rotation element is cylindrical - in particular as a pin - shaped, connects the connecting element and the connection partner - in particular positively - and, cooperating with the screw shaft, supports the connection element on the connection partner so that it cannot rotate. This represents an advantageously simple design of the anti-rotation element, the torsion-proof support of the connection element via the connection partner due to the cylindrical configuration of the anti-rotation element in cooperation with the screw shaft of the screw. The cylindrical anti-rotation element can in this case be designed as a separate component or else be formed on the connection element or connection partner. The anti-rotation element would also engage in an engagement opening formed in the connection partner or the connection element to connect the connection element and the connection partner.

It is also considered beneficial if the anti-rotation element is designed in two parts as parallelepiped-shaped side stops formed in the longitudinal direction, at least partially over the length of the connection element or the connection partner, which laterally encompass the connection partner or the connection element and thus support the connection element in a rotationally secure manner. Advantageously, in such an embodiment, no engagement opening would have to be made in the connection element or the connection partner for the anti-rotation element, so that there would be no mechanical weakening of this. In addition, due to the shape of the side stops on both sides, the underhead torque could be distributed to the side stops, so that the mechanical load on a respective side stop is reduced.

It is also very promising if the anti-rotation element is a rectangular transverse stop which is formed in the transverse direction, at least partially over the width of the connection element or the connection partner, on which the connection partner or the connection element rests on the end face and thus - in particular interacting with the screw shaft - supports the connection element in a torsion-proof manner . This turns out to be advantageous in that, for example, in comparison to the formation of side stops on the connection element or connection partner, the width of the connection element or the connection partner can be made the same. This is extremely profitable, especially when the installation space is limited.

Furthermore, it is to be regarded as particularly profitable if the anti-rotation element is formed in one piece on the connection element or connection partner. This can be done in a practical way by assembling the connecting element and / or simplify connection partner for connection arrangement.

• 1a, 1b eine erste Weiterbildung einer Verbindungsanordnung in stark vereinfachter Ansicht;
• 2a bis 2c eine erste Weiterbildung einer Verbindungsanordnung in perspektivischer Ansicht;
• 3 drei Verbindungsanordnungen in unterschiedlichen Montagezuständen;
• 4 Ausführungsformen des Formschlussabschnitts sowie der Formausnehmung;
• 5a bis 5d eine zweite Weiterbildung einer Verbindungsanordnung;
• 6a, 6b eine dritte Weiterbildung einer Verbindungsanordnung;
• 7a, 7b eine vierte Weiterbildung einer Verbindungsanordnung;
• 8a, 8b eine fünfte Weiterbildung einer Verbindungsanordnung;
• 9a, 9b eine sechste Weiterbildung einer Verbindungsanordnung.

The invention allows numerous embodiments. To further clarify their basic principle, some of them are shown in the drawing and are described below. The drawing shows in

• 1a , 1b a first development of a connection arrangement in a greatly simplified view;
• 2a to 2c a first development of a connection arrangement in a perspective view;
• 3 three connection arrangements in different assembly states;
• 4th Embodiments of the form-fit section and the shaped recess;
• 5a to 5d a second further development of a connection arrangement;
• 6a , 6b a third further development of a connection arrangement;
• 7a , 7b a fourth further development of a connection arrangement;
• 8a , 8b a fifth development of a connection arrangement;
• 9a , 9b a sixth further development of a connection arrangement.

In the 1a , 1b , 2a to 2c as well as 3 and 4 is a first further development of the connection arrangement 1 shown. The connection arrangement 1 has the connecting element designed as a cable lug 2 and with the connecting element 2 Connection partners connected by fasteners and designed as a busbar 3 on, with the connecting element 2 and the connection partner 3 in their longitudinal direction L. partially overlap. The first fastening means over which the connecting element 2 with the connection partner 3 connected is the screw 5 with her screw head 6th and their screw shaft 7th . This is the screw head 6th less spaced apart and also directly on the screw head 6th adjacent connecting element 2 is directly above the one with the screw 5 cooperating, second fastening means in the form of the nut 8th , which also the anti-rotation element 4th trained, supported against rotation. The mother 8th himself thereby points out motherhood 9 , the nut head 10 as well as a centrally designed and to the connecting element 2 accessible internal thread, the internal thread being the nut 8th goes through completely and the screw shaft 7th engages in the internal thread. For non-rotating support of the connecting element 2 has the nut head 10 over the form-fit section 11 , which non-rotatably positively in the with the form-fitting section 11 of the nut head 10 cooperating, identically shaped recess 12 of the connecting element 2 intervenes. The form-fit section occurs here 11 through the recess 18th in the connection partner 3 through it, the recess 18th is designed so widened that the connection partner 3 transverse to the central longitudinal axis M. mother 8th not with the form-fit section 11 comes into contact. The connection partner 3 however, lies in the direction of the central longitudinal axis M. on the support section 13th of the nut head 10 on.

Besides that from 1a Rectangular cross-section of the form-fit section to be taken 11 are the 4th further possible cross-sectional shapes of the form-fit section 11 can be seen, the form-fitting section 11 is triangular, hexagonal, octagonal or polygonal, or elliptical in shape. The respective shape recess 12 of the connecting element 2 is correspondingly shaped in the same way. All of the cross-sectional shapes shown are suitable for twisting the connecting element 2 to prevent.

The 2a to 2c it can also be seen that the mother 8th about her motherhood 9 form-fitting, non-rotatable, but longitudinally displaceable in the contact bridge 15th the connection arrangement 1 is arranged, the figures showing the sequence of fastening by means of the screw 5 and the mother 8th reveal. This is where 2a no screw yet 5 into the internal thread of the nut 8th a. Also the form-fit section 11 does not yet pass through the recess 18th and consequently does not yet reach into the recess 12 a what the starting point when attaching fastener 2 and connection partner 3 represents. 2 B describes the engagement of the screw below 5 , especially the screw shank 7th , into the internal thread of the nut 8th , these in their starting position in the contact bridge 15th persists. Due to the non-rotatable but longitudinally displaceable arrangement of the motherhood 9 in the contact bridge 15th occurs when the screw is tightened 5 a relocation of the mother 8th along the central longitudinal axis M. in the direction of the screw head 6th and thus in the direction of the connecting element 2 as well as the connection partner 3 . The form-fit section 11 passes through the recess 18th and then engages in a non-rotatable form-fitting manner in the recess 12 a, making the connector 2 about the mother 8th , especially motherhood 9 in the contact bridge 15th is supported against rotation. The connection partner is in this position 3 also finally on the support section 13th of the nut head 10 on. This end position of the mother 8th is in 2c shown.

In 3 is a group of three connection arrangements 1 shown, the figure showing the assembly sequence of the connecting arrangements 1 can be found. The left one of the three connection arrangements 1 is in the assembly state shown in the figure only with the connection partner 3 and the mother 8th designed, which is in the contact bridge 15th is located. Then the fastener 2 in the view in front of the connection partner 3 positioned what is shown in the illustration of the middle connection arrangement 1 and is shown in the second view. This is followed by the illustration of the connection arrangement on the right 1 can be seen, the connection of the connecting element 2 with the connection partner 3 by means of the screw 5 and the mother 8th .

The 5a to 5d Figure 3 is a second embodiment of the connector assembly 1 , respectively a representation of the mother 8th , refer to. The 5a and 5b represent a greatly simplified section and a plan view, the 5c a perspective view of the connector assembly 1 in the connection arrangement 1 shows the nut head 10 the normal to the central longitudinal axis M. mother 8th trained flat support section 13th and two perpendicular to this support section 13th extending side cheeks and arranged in the area of the head circumference 14th on. The sidewalls 14th grip around the connecting element 2 laterally, with side surfaces of the connecting element 2 on the inside of the sidewalls 14th Apply twist-proof supporting. The connection partner 3 again lies on the support section 13th on, where the connection partner 3 transverse to the central longitudinal axis M. only rests on one side of a side wall. Of motherhood 9 about which the mother 8th form-fitting, non-rotatable, but longitudinally displaceable in a contact bridge 15th the connection arrangement 1 is arranged, here has a polygonal cross-section for the purpose of preventing rotation.

The 6a and 6b further describe a third, the 7a and 7b a fourth embodiment of the connection arrangement 1 . Here are in the 6a and 7a again cuts in the 6b , 7b Supervision of the respective connection arrangement 1 shown greatly simplified. These connection arrangements too 1 show the fastener 2 and with the connecting element 2 about that as a screw 5 executed fasteners connected connection partner 3 on. The connecting elements overlap 2 and the connection partner 3 in their longitudinal direction L. partially and the connecting element 2 is via the anti-rotation element designed as a pin 4th anti-twist. The screw 5 shows the screw head 6th and the screw shaft 7th on, which is the screw head 6th less spaced connecting element 2 by the engagement of the anti-rotation element 4th in the fixedly arranged connection partner 3 , here in the middle of the connection partner 3 shaped engagement opening 19th , is supported against rotation. The anti-rotation element is here 4th Cylindrical in both connection arrangements, connects connecting element 2 and connection partner 3 and supports the connecting element 2 with the screw shaft 7th cooperating on the connection partner 3 twist-proof. The training of the 6a and 6b differ only in that the anti-rotation element designed as a pin 4th in the training of 6a , 6b is carried out separately, the anti-rotation element 4th in the training of 7a , 7b in one piece on the connecting element 2 is formed.

The ones in the 8a and 8b fifth embodiment of the connecting arrangement, again shown greatly simplified in section and top view 1 discloses an anti-rotation element 4th , wherein the anti-rotation element 4th two-part, than lengthways L. over the length of the connection partner 2 shaped, cuboid side stops 16 is formed, which the connection partner 3 grip around the side and thus the connecting element 2 support against rotation.

In the sixth embodiment of the connecting arrangement, which is also shown greatly simplified in section and top view 1 , which in the 9a and 9b is disclosed, finds a rotation lock 4th Application which one in the transverse direction Q , across the width of the connection partner 2 shaped, cuboid transverse stop 17th is to which the connection partner 3 rests on the face and thus the connecting element 2 due to the fixed arrangement of the connection partner 3 is supported against rotation.

List of reference symbols

1

Connection arrangement

2

Connecting element

3

Connection partner

4th

Anti-rotation element

5

screw

6th

Screw head

7th

Screw shank

8th

mother

9

maternity

10

Nut head

11

Form-fit section

12

Form recess

13

Support section

14th

Sidewall

15th

Contact bridge

16

Side stop

17th

Cross stop

18th

Recess

19th

Engagement opening

L.

Longitudinal direction

M.

Central longitudinal axis

Q

Transverse direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2857700 B1 [0007]
• DE 8914065 U1 [0008]
• DE 102015011695 A1 [0009]

Claims (10)

Connection arrangement (1) comprising a connection element (2) and a connection partner (3) connected to the connection element (2) via at least one fastening means, the connection element (2) and connection partner (3) at least partially overlapping in their longitudinal direction (L) and the The connecting element (2) is designed to be non-rotatable via at least one anti-rotation element (4), characterized in that a first fastening means is a screw (5) with a screw head (6) and screw shank (7), in this case the connecting element (which is less spaced from the screw head (6)) 2) either directly via a second fastening means in the form of a nut (8), which cooperates with the screw (5) and which also forms the anti-rotation element (4), is supported against rotation or the connecting element (2) is secured by engagement or abutment of the anti-rotation element ( 4) in or on the fixedly arranged connection partner (3) supported against rotation tzt. Connection arrangement (1) according to Claim 1 , characterized in that the nut (8) has a mother shaft (9), a nut head (10) and a centrally formed internal thread which is accessible at least towards the connecting element (2). Connection arrangement (1) according to the Claims 1 or 2 , characterized in that a form-fit section (11) of the nut head (10) or the nut head (10) engages in a non-rotatable form-fitting manner in an identically shaped recess (12) of the connecting element (2) which cooperates with the form-fit section (11) or the nut head (10) . Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the nut head (10) has a flat support section (13) normal to the central longitudinal axis (M) of the nut (8) and at least two extending perpendicularly from this support section (13) has shaped side cheeks (14) arranged in the area of the head circumference. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the nut (8) is arranged in a contact bridge (15) of the connecting arrangement (1) in a form-fitting, non-rotatable manner via its mother shaft (9), but longitudinally displaceable. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the side cheeks (14) laterally encompass the connecting element (2), with side surfaces of the connecting element (2) resting against the inner sides of the side cheeks (14) so as to be non-rotatable. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the anti-rotation element (4) is cylindrical, connects the connecting element (2) and the connecting partner (3) and the connecting element (2) cooperates with the screw shank (7) on the connecting partner (3) supported against rotation. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the anti-rotation element (4) is in two parts, as rectangular side stops (16) formed in the longitudinal direction (L) at least partially over the length of the connecting element (2) or the connecting partner (3) ) is formed, the side stops (16) laterally encompassing the connection partner (3) or the connecting element (2) and thus supporting the connecting element (2) in a rotationally secure manner. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the anti-rotation element (4) is a rectangular transverse stop (17) formed in the transverse direction (Q), at least partially over the width of the connecting element (2) or the connecting partner (3). is on which the connection partner (3) or the connection element (2) rests on the front side and thus supports the connection element (2) in a rotationally secure manner. Connecting arrangement (1) according to at least one of the preceding claims, characterized in that the anti-rotation element (4) is formed in one piece on the connecting element (2) or connection partner (3).

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