DE102020201137A1 - Crimp barrel prepared for crimping - Google Patents

Abstract

The invention relates to a crimp barrel (1) prepared for crimping. The crimp barrel (1) according to the invention has a crimp base (6) located between two crimp wings (4), which is provided with a support area (8) for the electrical conductor (3), the support area (8) having a first curvature (10) ) having. Furthermore, on both sides of the support area (8) in a circumferential direction (U), in which at least the support area (8) is curved, there is in each case an area (12) with a second curvature (14), a curvature diameter of the second curvature (14 ) is smaller than a curvature diameter of the first curvature (10). In addition, it is provided that a rigidity, in particular a flexural rigidity, in the support area (8) or even in the entire crimp base (6) is less than a rigidity, in particular a flexural rigidity, in the respective crimp wings (4).

Description

The invention relates to a crimping sleeve prepared for crimping for crimping an electrical conductor of a predetermined diameter.

Crimp sleeves of the aforementioned type are crimped onto a braided wire of the electrical conductor, for example, as a support sleeve. The size or geometry of the crimp barrel is matched to the diameter of the electrical conductor. Therefore, for an electrical conductor with a predetermined diameter, a crimping sleeve provided for this diameter can be used for crimping the electrical conductor. The crimp barrel can serve as a support for an electrical contact that can be crimped around the crimp barrel to terminate the electrical conductor. It is important here that individual strands or shielding wires of the electrical conductor do not protrude radially out of the crimp sleeve or are clamped in a crimp seam. This problem leads to scrap in the production of a crimped conductor. In order to prevent the strands or shielding wires from being pinched or protruding, a special crimping tool can be used, which is provided with spring assemblies, for example, in order to press the electrical conductor onto a support area of the crimp barrel during the crimping process. Such crimping tools are, however, very specific and not always available at the place of use.

It is therefore the object of the invention to produce a crimp barrel prepared for crimping for crimping, which reduces the risk of incorrect production during crimping.

The object is achieved according to the invention by a crimp sleeve prepared for crimping for crimping an electrical conductor of predetermined diameter, the crimp sleeve having a crimp base located between two crimping wings, which is provided with a support area with a first curvature for the electrical conductor. According to the invention it is provided that on both sides of the support area there is a region with a second curvature, a curvature diameter of the second curvature being smaller than a curvature diameter of the first curvature. Furthermore, it is provided that the crimping base has a lower rigidity than the crimping wings, in particular a lower flexural rigidity.

The crimp sleeve prepared for crimping describes an initial state of the crimp sleeve in which the crimp sleeve is not yet deformed for crimping with the electrical conductor.

The inventive solution optimizes the geometry of the crimp barrel prior to deformation in such a way that the crimp base is first deformed when crimping, so that the diameter of the curvature of the first curvature adapts to the diameter of the curvature of the second curvature. The electrical conductor is pressed against the support area by the crimping wings before the crimping wings are bent in a final step. In this way, regardless of the crimping tool, it can be ensured that the electrical conductor is pressed against the support area during the crimping process, especially before the crimping wings are bent, thus preventing individual strands or shielding wires from becoming trapped in a crimp seam between the two crimping wings. Since the crimping sleeve is adapted to the predetermined diameter or a predetermined diameter range for crimping, specially optimized crimping sleeves can be provided for different electrical conductors.

In the following, further developments are listed which can be combined with one another as required independently of one another and which are advantageous in themselves.

For example, the support area can be spaced apart on both sides from the respective areas with the second curvature. The crimping base can extend beyond the contact area in a circumferential direction along which the contact area is curved with the first curvature. The crimping base can preferably have a continuous curvature in the circumferential direction, so that the crimping base forms a depression. As a result, even if the electrical conductor is initially incorrectly positioned in the circumferential direction, it can automatically align itself by sliding on an inner wall of the crimp base in the support area.

The crimp sleeve can preferably be curved in the circumferential direction and receive the electrical conductor in an axial direction. For this purpose, at least the support area can have a convexly curved support surface. The crimping wings can be arranged on both sides in the circumferential direction on the crimping base, wherein the region with the second curvature can preferably be a section of the respective crimping wing adjoining the crimping base.

In order to ensure the best possible fit of the electrical conductor in the crimp sleeve, the curvature diameter of the first curvature can be greater than the predetermined diameter of the electrical conductor. A secant between two ends of the crimped base which are opposite one another in the circumferential direction can preferably be greater than the predetermined diameter. This can ensure that the electrical conductor can be pressed flat against the support area without resistance from the crimp base.

The support area can extend in the axial direction to a separating web. The separating web can serve, for example, for better handling of the crimping sleeve and for resting on the crimping tool. During the crimping process, the separating web can be removed from the rest of the crimp barrel, for example by cutting off or punching out.

For a further optimization of the geometry of the crimp barrel, the curvature diameter of the second curvature can essentially correspond to the predetermined diameter. As a result, the respective area can nestle against an outer surface of the electrical conductor during the crimping process, without having to be deformed.

According to a further advantageous embodiment, the areas with the second curvature can have a higher rigidity compared to the support area, in particular the crimp base, and the crimp wings. If the areas form a section of the crimping wings, the respective areas can have a higher rigidity than the rest of the respective crimping wings. This ensures that the areas are not significantly deformed during the crimping process. First, the crimping base is bent over until the areas nestle against the outer surface of the electrical conductor and the curvature diameter of the crimping base corresponds approximately to the predetermined diameter. In a final step, the wings are bent over so that the crimp sleeve surrounds the electrical conductor.

A higher rigidity can be generated, for example, in that at least the regions have at least one bead, that is to say, introduced depressions or elevations that are introduced perpendicular to a surface. The at least one bead can be shaped, for example, as a reinforcing rib protruding radially on a convexly curved inner surface of the regions. Preferably, two reinforcing ribs can be provided at a distance from one another in the axial direction.

Since these reinforcing ribs press against the electrical conductor in the crimped state, the reinforcing ribs can additionally fix the electrical conductor axially. The axial fixation can be further improved if the bead is as sharp as possible.

The bead can be implemented by various methods, in particular the bead can be embossed.

If the hold of the electrical conductor is to be further strengthened in the axial direction, the at least one bead can extend, preferably continuously, in the circumferential direction from one area to the other area over the crimp base and / or the support area. This can also increase the rigidity of the crimp base, but this can be compensated for by different measures. For example, the material thickness of the crimping wings can be adapted so that the crimping base still has a lower rigidity than the crimping wings and / or the areas.

According to a further advantageous embodiment, the rigidity of the crimp base can be reduced by a recess in the crimp base. The recess can preferably extend from one end of the crimp base in the circumferential direction to the opposite end.

The recess can be elongated in the circumferential direction and have a constant depth in the radial direction transversely to the circumferential direction. The recess can pass through the crimp sleeve in the radial direction, thereby forming a window framed by the rest of the crimp base. The recess allows the rigidity of the crimp base to be greatly reduced without great effort, so that an increase in rigidity due to the bead can be leveled out.

The recess can be arranged in the axial direction between two beads. The recess can preferably have a central axis extending in the circumferential direction, which at the same time forms an axis of symmetry for the crimp barrel. This ensures that the crimp sleeve is evenly deformed in the axial direction during the crimping process.

According to a further advantageous embodiment, the crimping wings or the remaining part of the crimping wings can extend essentially in a straight line from the respective area to a free end. The crimping wings or the remaining part of the respective crimping wings can preferably extend in an initial state before crimping at angles inclined from one another, so that a clear width between the opposite crimping wings widens towards the free end. This can prevent individual strands or shielding wires from getting caught on the crimp wings when the electrical conductor is inserted into the crimp sleeve. This can be achieved, for example, by in that the region with the second curvature extends at an angle up to a maximum of approximately 90 °.

To secure the crimp barrel in the crimped state, the crimp wings can have positive locking elements that are complementary to one another. Thus, the form-locking elements can preferably be arranged at the respective free end and prevent the crimp sleeve from opening by moving the crimping wings in opposite circumferential directions by means of a form-fit.

The complementary form-locking elements can be formed, for example, by mutually engaging tabs. At a free end, for example, two tabs which are spaced apart from one another in the axial direction and have shoulders projecting from one another in the axial direction can be arranged. At the other free end, two complementary tabs which can be inserted between the tabs at the first free end and which are each provided with shoulders projecting away from one another in the axial direction can be formed. The shoulders of the tabs and the complementary tabs can thus produce a form fit in the circumferential direction.

A crimping arrangement can have an electrical conductor with a predetermined diameter and a crimping sleeve according to one of the preceding configurations. The crimping base can have a support area with a curvature, the curvature diameter of which is greater than the predetermined diameter, at least before the crimping. The regions with the second curvature can preferably have a curvature diameter which essentially corresponds to the predetermined diameter. As a result, when crimping, the areas can nestle against the outer surface of the electrical conductor, while the crimp base, in particular the support area, is bent around the electrical conductor.

The crimping wings or the remaining part of the respective crimping wings can press the electrical conductor against the support area during the crimping process before the crimping wings are bent in a final step of the crimping process and also nestle against the outer surface of the electrical conductor.

The electrical conductor can preferably have a cross-sectional geometry in a sectional plane transverse to the axial direction, which is almost identical before and after crimping. The crimp can be, for example, an O-crimp, an overlap crimp or a surrounding crimp. Consequently, the crimp sleeve can serve as a support sleeve and be designed in such a way that it does not penetrate into the conductor or its insulation.

In the following, the invention is described in more detail using exemplary embodiments with reference to the accompanying figures. In the figures, elements that correspond to one another in terms of structure and / or function are provided with the same reference symbols.

The combinations of features shown and described in the individual exemplary embodiments are only used for explanation. In accordance with the above statements, a feature of an exemplary embodiment can be dispensed with if its technical effect is not important in a specific application. Conversely, in accordance with the above statements, a further feature can be added in an exemplary embodiment if its technical effect should be advantageous or necessary for a specific application.

• 1 eine schematische Perspektivansicht einer beispielhaften Ausgestaltung einer erfindungsgemäßen Crimphülse;
• 2 eine schematische Frontalansicht der Crimphülse vor dem Vercrimpen;
• 3 eine schematische Frontalansicht der Crimphülse aus 2 während des Crimpvorgangs; und
• 4 eine schematische Perspektivansicht der Crimphülse aus 1 in einem geschlossenen Zustand.

Show it:

• 1 a schematic perspective view of an exemplary embodiment of a crimp barrel according to the invention;
• 2 a schematic front view of the crimp barrel before crimping;
• 3 a schematic front view of the crimp barrel 2 during the crimping process; and
• 4th a schematic perspective view of the crimp barrel from 1 in a closed state.

An exemplary embodiment of a crimp barrel prepared for crimping according to the invention 1 is below with reference to 1 until 4th explained in more detail.

The crimp barrel 1 can be designed as a shield crimp and as a support sleeve 2 serve. Consequently, the crimp barrel 1 for example as a surrounding crimp, overlap crimp or as an O-crimp with an electrical conductor 3 be crimped. The support sleeve 2 can be used in the crimped area as a support for a further crimp connection, for example to terminate the electrical conductor 3 , serve. A crimping arrangement 52 can the electrical conductor 3 and a crimp barrel according to the invention 1 exhibit.

The crimp barrel according to the invention 1 shows you between two crimping wings 4th located crimp base 6th on, the one with a support area 8th for the electrical conductor 3 is provided, the support area 8th a first bend 10 having. There is also a support area on both sides 8th in a circumferential direction U , in the at least support area 8th is curved, in each case a region 12 with a second curvature 14th , where a curvature diameter of the second curvature 14th is smaller than a curvature diameter of the first curvature 10 . In addition, it is provided that a rigidity, in particular a flexural rigidity, in the support area 8th or even in the entire crimp base 6th is less than a rigidity, in particular flexural rigidity, in the respective crimp wings 4th .

Due to the optimized geometry of the crimp barrel according to the invention 1 the first deformation can occur on the support area, in particular on the crimp base 6th take place. The crimp base is thereby 6th around the electrical conductor 3 bent around while the crimping wing 4th the electrical conductor against the support area 8th to press. It is therefore possible to prevent individual strands or shield wires of the electrical conductor from being crimped in a crimp seam between the two crimping wings 4th are pinched or even protrude in the radial direction. Consequently, a risk of incorrect production during crimping can be reduced even without a special crimping tool.

The crimp barrel 1 can preferably be formed in one piece as a monolithic component, for example by a stamping and bending process.

The areas 12 can each be in the circumferential direction U from the support area 8th be spaced. The crimp base can become 6th over the support area 8th on both sides in the circumferential direction U extend away and preferably on both sides in the circumferential direction U adjoin the respective areas 12. The areas 12 can preferably be a section 16 the respective crimping wing 4th represent, the areas 12 on the crimp base 6th adjoin and a remaining part 18th the respective crimping wing 4th from the respective areas 12 to a free end 20th towards, especially straight away.

The crimp base 6th can in the circumferential direction U continuously from an end adjoining a region 12 22nd to an end adjacent to the opposite region 12 22nd with the first curve 10 be curved. This creates a hollow 24 with a convex inner surface through which the electrical conductor 3 automatically to the contact area at the extremum 8th slips off.

If the crimp base 6th a continuous curvature in the circumferential direction U has, then the crimp base 6th can be precisely distinguished from the areas 12 by the change in curvature.

The crimp barrel 1 can in particular in a transverse direction Q be convex and curved in an axial direction A. perpendicular to the transverse direction Q just run. This forms the crimp barrel 1 a tub 26th in which the electrical conductor in the axial direction A. can be inserted.

One from one end 22nd of the crimp base to the other end 22nd of the crimping base extending secant 31 can preferably be longer than the predetermined diameter 30th of the electrical conductor 3 , as in 2 is shown. This can ensure that the electrical conductor 3 before crimping into the crimp barrel without any problems 1 can be used and against the support area 8th can be pressed. The curvature diameter of the first curve 10 can preferably be larger than the predetermined diameter 30th .

As in 1 can be seen, the crimp base can 6th , especially the support area 8th in an axial direction A. , across the circumferential direction U , to a divider 28 extend. The divider 26th can for example for better handling of the crimp barrel 1 and are removed during the crimping process by, for example, punching or cutting off, so that after the crimping process there is at most one stub on the crimped crimp barrel 1 is arranged.

The second curve 14th may have a diameter of curvature that is substantially a predetermined diameter 30th of the electrical conductor 3 is equivalent to. As a result, the areas 12 can be attached to an outer surface without being deformed during the crimping process 32 of the electrical conductor 3 snuggle up.

In order to avoid deformation of the areas 12 during the crimping process, the areas 12 can have a higher rigidity, in particular flexural rigidity, compared to the crimping base 6th and the crimping wings 4th exhibit. In the in 1 The illustrated embodiment, the areas 12 are part of the respective crimping wings 4th . In this embodiment, the areas 12 can have a higher rigidity, in particular flexural rigidity, compared to the respective remaining part 18th , ie the respective free end 20th , of the respective crimping lever 4th exhibit.

As in 1 and 4th can be seen, the rigidity, in particular the flexural rigidity, of the areas 12 by a bead 34 in the form of an embossed stiffening rib 36 increase.

In the embodiment shown, the stiffening rib 36 into a radially outwardly facing lateral surface 38 the crimp barrel 1 be embossed so that on the outer surface 38 one Depression is created and the stiffening rib 36 on the radially inwardly facing inner surface of the crimp barrel 1 , in particular the areas 12 protrudes. There can also be several stiffening ribs 36 be provided. For example, in the embodiment shown, two are parallel to one another in the axial direction A. spaced and circumferential U running stiffening ribs 36 present, with the stiffening ribs 36 consistently from one to the rest of the part 18th adjacent end of the area 12 via the crimp base 6th to the opposite end of the other area 12 extend.

This increases the rigidity in the crimp base 6th also increased, but the stiffening ribs 36 can, in particular, if they are sharp-edged, for the axial fixation of the electrical conductor 3 serve. About the rigidity in the crimp base 6th According to the exemplary embodiment, one between the two ends is to be further reduced 22nd of the crimp base 6th in the circumferential direction U extending recess 40 intended. Of course, the recess can also be independent of the stiffening ribs 36 on the crimp base 6th be provided.

The recess 40 can preferably be axially centered between the two stiffening ribs 36 be arranged so that one in the circumferential direction U running central axis 42 the recess 40 in a plane of symmetry transverse to the axial direction A. is arranged. This can prevent the bending behavior of the crimp barrel 1 in the axial direction A. is different, whereby one in the axial direction A. uneven crimping occurs.

The recess 40 For example, it can be used as a recess or, as can be seen in the figures, as a window 44 that is the crimp base 6th penetrated in the radial direction, be designed.

The crimping wings 4th or the remaining part 18th the respective crimping wing 4th can extend substantially in a straight line from the corresponding area 12. Preferably, an angle by which the area 12 extends is a maximum of approximately 90 °, so that the crimping wings 4th are averse to each other. This allows a clearance between the crimping wings 4th towards the free end 20th to widen. This prevents that when inserting the electrical conductor 3 Before crimping, individual strands and / or shield wires of the conductor on the crimping wings 4th tangle or through the crimping wings 4th to get distracted.

The crimping wings 4th can on their, outwards from the opposite crimping wing 4th remote side, facing run-up surface 48 be provided, the ramp surface 48 is configured to slide along a mating surface of a crimping tool. When sliding along, a force can be exerted on the crimping wings in a first step 4th are exerted, whereby a bending moment generated by the force increases the bending stiffness in the crimp base 6th exceeds. This leads to a plastic deformation of the crimp barrel 1 on the crimp base 6th , with the crimp base 6th around the electrical conductor 3 is bent around. The crimping wings press 6th without deforming the electrical conductor 3 against the support area 8th , as in 3 is shown.

The crimping wings can then 4th in a second step of the crimping process around the electrical conductor 3 bent so that the crimp barrel 1 the electrical conductor 3 encompasses. For locking the crimp barrel 4th can use the crimping wing 4th at their respective free ends 20th positive locking elements complementary to one another 50 exhibit.

The mutually complementary interlocking elements 50 can be used as interlocking tabs 51 be designed so that an opening of the crimping wing 4th in the circumferential direction U away from each other can be prevented by a form fit.

List of reference symbols

1

Crimp barrel

2

Support sleeve

3

electrical conductor

4th

Crimping wing

6th

Crimp base

8th

Support area

10

first curve

14th

second curvature

16

section

18th

remaining part

20th

free end

22nd

End of the crimp base

24

Cool

26th

Tub

28

Divider

30th

predetermined diameter

32

Exterior surface

34

Bead

36

Stiffening rib

38

Outer surface

40

Recess

42

Central axis

44

window

48

Ramp surface

50

Form-fit element

51

Tab

52

Crimping arrangement

A.

axial direction

Q

Transverse direction

U

Circumferential direction

Claims (15)

Crimp barrel (1) prepared for crimping for crimping an electrical conductor (2) of a predetermined diameter (30), the crimping barrel (1) having a crimp base (6) located between two crimping wings (4) with a support area (8) a first curvature (10) is provided for the electrical conductor (2), a region (12) with a second curvature (14) being located on both sides of the support area (8), a curvature diameter of the second curvature (14) is smaller than a curvature diameter of the first curvature (10), and wherein the crimping base (6) has a lower rigidity than the crimping wings (4). Crimp barrel (1) prepared for crimping Claim 1 , wherein the region (12) with the second curvature is in each case a section (16) of the respective crimping wing (4) adjoining the crimping base (6). Crimp barrel (1) prepared for crimping Claim 1 or 2 , wherein the crimping base (6) is continuously curved with the first curvature (10). Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 3 , wherein the areas (12) have a higher rigidity compared to the crimp base (6) and a remaining part (18) of the respective crimp wings (4). Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 4th , wherein at least the areas (12) are provided with at least one bead (34). Crimp barrel (1) prepared for crimping Claim 5 , wherein the at least one bead (34) is embossed. Crimp barrel (1) prepared for crimping Claim 5 or 6th wherein the at least one bead (34) extends continuously from one area (12) over the crimp base (6) to the other area (12). Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 7th , wherein the crimp base (6) is provided with at least one recess (40). Crimp barrel (1) prepared for crimping Claim 8 , wherein the at least one recess (40) penetrates the crimp base (6). Crimp barrel (1) prepared for crimping Claim 8 or 9 wherein the at least one recess (40) extends between ends (22) of the crimp base (6) adjoining the respective regions (12). Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 10 , wherein the crimping wings (4) extend in a straight line to a free end (20). Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 11 , wherein the crimping wings (4) are provided with mutually complementary form-fit elements (50) in order to prevent the crimp sleeve (1) from opening in a crimped state by means of a form-fit connection. Crimp barrel (1) prepared for crimping according to one of the Claims 1 until 12th wherein the mutually complementary interlocking elements (50) are shaped as tabs (51) that can be gripped from behind one another. Crimping arrangement (52) comprising an electrical conductor (3) with a predetermined diameter (30) and a crimping sleeve (1) prepared for crimping according to one of the Claims 1 until 13th wherein the first curvature (10) at least before crimping has a larger curvature diameter than the predetermined diameter (30) and wherein the curvature diameter of the second curvature (10) corresponds to the predetermined diameter (30) at least before crimping. Crimping arrangement (52) Claim 14 , wherein a cross-sectional geometry of the electrical conductor (3) is essentially identical before and after crimping.

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