EP1617522B1 - Female contact and method of production of such a contact, electrical connector - Google Patents

Abstract

An inner contact socket element (3) with a contact section (4) defines a cavity (5) for holding a pin. An additional flexible bush (6) partly embraces the contact section. The inner contact socket element and the additional flexible bush form a single piece. A contact socket (2) fits in a casing. Independent claims are also included for the following: (A) A method for producing a contact socket; (B) and for a plug connection socket; (C) and for an electrical connection.

Description

The invention relates to a contact socket having an at least one contact portion comprehensive inner female contact element which defines at least one cavity for receiving a pin, and at least one auxiliary spring sleeve, which at least partially surrounds the contact portion has.

Furthermore, the invention relates to a method for producing such a contact socket.

Furthermore, the invention relates to a socket in which such a contact socket is arranged in a housing, and an electrical plug connection, which in turn comprises such a socket and a plug pin, which is designed for insertion into the cavity of the contact portion of the inner contact socket element of the contact socket.

Such electrical connections are used to produce a detachable electrical connection between two electrical lines or an electrical line and a - usually provided directly to an electrical component - electrical connection. For this purpose, a pin is plugged into a socket, concretely in the contact socket. To disconnect the connector pin is pulled out of the socket again.

In certain applications, such as automotive electronics, such connectors are exposed to harsh environmental conditions, such as strong temperature fluctuations and shocks, but also moisture. In order to still ensure a secure electrical connection, the connectors must therefore, among other things temperature and vibration resistant, but also be resistant to corrosion. This results, inter alia, high demands on the durability of the contact between socket or contact socket and pin.

The contact sockets used for these connectors usually have a contact portion into which the plug pin can be inserted, and a clamping portion, over which an electrical line, such as a wire or a cable, electrically contacted and held, in particular clamped, can be. Usually, this is done by pressing parts of the clamping portion to the electrical line. Furthermore, contact sockets comprise latching tongues for latching the socket in a housing.

From DE 1526771 A, such an electrical contact socket, namely a terminal for ignition cables of motor vehicles, known which consists of a tubular rolled sheet metal stamping. The terminal has a contact portion, which can be plugged, for example, as a sleeve part on the bolt of the spark plug of an automobile. The contact portion has two parts which snap over each other via correspondingly formed tongues and openings overlapping each other. Furthermore, the terminal comprises a clamping portion with a plurality of ferrules, which are pressed for attachment and contacting to a cable end.

A comparable contact socket is known from DE 71 33 507 U, here as part of an electrical line coupling, which in addition to the socket has a pin which can be inserted into the socket. To improve the contacting lamellae (clamp, contact spring arms) are formed in the contact portion of the contact socket.

These contact sockets have the disadvantage that they can have contacting problems. Thus, for example due to improper insertion of the connector pin, the contact section may bend.

In order to overcome this disadvantage, it is known from DE 36 29 740 C2 to provide an over-spring (auxiliary spring sleeve) which holds the contact section of the bushing clutching. As a result, the spring forces of the detent spring arms are increased and created protection against the bending of the contact portion.

Another disadvantage of the above-described contact sockets, which can also bring about contacting problems, is the limitation of the training possibilities of contact spring arms at the contact portion of the contact socket. This restriction results from the fact that in the contact portion and locking lugs for locking the contact socket must be formed with the Stekkerbuchsen housing, whereby not the entire inner surface of the contact portion of the socket for contacting, in particular the formation of the contact spring arms, is available. This disadvantage is not resolved in DE 36 29 749 C2. There, although the locking lugs (Rastfederarme) are formed in the over-spring, however, gaps are formed in the contact portion below the locking lugs so that the locking lugs can spring freely inward. Thus, the training possibilities for contact spring arms at the contact portion of the contact socket are also limited here, which may possibly lead to Kontaktierungsproblemen.

Further contact bushes with auxiliary spring sleeves in different forms are known from DE 36 29 740 C2 and EP 0 352 088 B1.

However, all these contact sockets with auxiliary spring sleeves is common that the inner, the contact portion comprehensive contact socket element and the auxiliary spring sleeve are separate components. This has the disadvantage that two different components produced and stored in the manufacture of the contact sockets, fed and possibly edited. This requires a relatively complex and therefore expensive manufacturing process.

The individual components of such contact sleeves, ie inner contact sleeve element and auxiliary spring sleeve, are usually produced by punching out a sheet metal strip. Often, different materials are used for the inner contact socket element and the auxiliary spring sleeve, ie, two materials must be supplied during production, which further complicates the production.

The present invention is therefore based on the object to provide a contact socket with optimized contacting properties, which is simple and inexpensive to produce. Furthermore, a method for producing such contact sockets and a socket with such a contact socket and an electrical plug connection are to be given with such a socket.

This object is achieved with respect to the contact socket by the features of claim 1, in terms of the method by the features of claim 9, with respect to the socket by the features of claim 11 and with respect to the connector by the features of claim 13. Further developments are specified in the claims dependent on the respective claims.

In the female contact according to claim 1, the invention provides that the inner female contact element and auxiliary spring sleeve are integrally formed. This means that inner contact socket element and auxiliary spring sleeve represent different sections or areas of a one-piece component. These areas are interconnected, if necessary via further sections or areas. At the same time, the one-piece design entails that the contact bush element and the auxiliary spring sleeve and optionally further connecting sections or areas made of a material, in particular of a copper-tin alloy (CuSn) and / or a copper-iron alloy (CuFe) and / or a copper-zinc alloy (CuZn) exist. The one-piece, contact socket element and auxiliary spring sleeve comprehensive component can be made for example by punching from a metal sheet.

The one-piece design greatly simplifies the production of the contact socket. There are no longer two different components, namely contact socket element and auxiliary spring sleeve, manufactured and stored in the production of the contact sockets, fed and possibly edited. The entire handling is easier. Furthermore, the supply of two different materials or metal strips, which is usually necessary in the punching of two individual parts, is eliminated. These simplifications In the production bring corresponding cost advantages.

At the same time, the optimized contacting properties mentioned at the beginning remain due to the design provided with the contact socket according to the invention with an inner contact socket element which has a contact section and with an auxiliary spring sleeve at least partially clasping the contact section.

According to an expedient, preferred development of the contact socket according to the invention, it is provided that the inner contact socket element, in particular the contact section, and auxiliary spring sleeve together define a front edge of the contact socket and / or that the inner contact socket element and the auxiliary spring sleeve are connected to one another at the front edge. Alternatively or additionally, it may further be provided that the connection between inner contact sleeve element and auxiliary spring sleeve is formed by a web formed and bent or bendable in one piece with inner contact sleeve element and auxiliary spring sleeve, in particular bent or bendable by approximately 180 °.

According to an advantageous embodiment of the contact socket is or are the contact portion and / or the auxiliary spring sleeve elongate and / or substantially tubular. Furthermore, the contact section and / or the auxiliary spring sleeve can have a substantially circular cross-section perpendicular to the longitudinal axis of the contact socket. It can further be provided that the contact section and / or the auxiliary spring sleeve has or have a groove extending essentially parallel to the longitudinal axis of the contact socket. The latter results in the usual production of a contact socket, in which the main body of the contact socket is first stamped from a metal sheet and contact section and / or auxiliary spring sleeve are then formed by coiling. The respective joint is formed.

An expedient development of the contact socket according to the invention provides that on the auxiliary spring sleeve, in particular on the side facing away from the front edge of the auxiliary spring sleeve, at least one fixing tab for fixing the auxiliary spring sleeve is formed on the contact portion, which engages for fixing in particular in a recess in the contact portion.

An advantageous embodiment of the contact socket according to the invention provides that the contact portion has one or more parallel to the longitudinal axis of the contact bush extending contact spring arms which are formed by longitudinal slots in the contact portion and each at least one projecting into the cavity of the inner contact socket element contact elevation for contacting the pin form. In particular, a plurality of contact spring arms, for example exactly seven contact spring arms, can be distributed essentially uniformly around the circumference of the contact section.

These embodiments contribute to the optimization of the contact between the contact socket and a plug inserted into the contact pin.

A preferred embodiment of the invention provides that the auxiliary spring sleeve clasps the contact portion along its entire length. In this case, auxiliary spring sleeve and contact portion may have substantially the same length.

According to an expedient and particularly advantageous embodiment of the contact socket according to the invention is at the auxiliary spring sleeve at least one, in particular radially outwardly over the outer surface of the auxiliary spring sleeve uplifting, preferably bent from the outer surface, locking tongue for locking the contact socket formed with a housing. As a result, a secure connection of the contact socket to the housing is to be made possible and ensured in the manufacture of a socket made of female contact and housing. For this purpose, two different types of locking tongues can be provided according to a development, which are bent in the opposite direction from the outer surface of the auxiliary spring sleeve. The size of the bending angle in the two types of locking tongues may differ. Thus, the bending angle of a kind between 60 ° and 120 °, in particular between 80 ° and 100 °, preferably at about 90 °, and / or the bending angle of the other type between 1 ° and 40 °, in particular between 5 ° and 20 °, preferably at about 10 °.

A further advantageous embodiment of the contact socket according to the invention provides that the inner contact socket element has at least one clamping section for connecting the contact socket to an electrical line, in particular a wire and / or a cable. In this case, contact section and clamping section are expediently formed at two opposite ends of the inner contact socket element. In particular, it can be provided that the clamping portion is formed as an open channel, is formed on the at least one, in particular exactly one, pressing portion for clamping the electrical line in the channel.

• a) Einstückiges Ausstanzen von innerem Kontaktbuchsenelement und Hilfsfederhülse aus einem Blech, wobei inneres Kontaktbuchsenelement und Hilfsfederhülse nach dem Ausstanzen einstückig ausgebildet sind, insbesondere über einen Steg miteinander verbunden sind.

The method according to claim 9 for the production of the aforementioned contact bushes according to the invention comprises according to the invention the following step:

• a) one-piece punching of inner female contact element and auxiliary spring sleeve of a metal sheet, wherein inner female contact element and auxiliary spring sleeve are formed integrally after punching, in particular via a web are connected.

The advantages of this manufacturing method will become apparent from the above description of the advantages of the contact socket according to the invention. Thus, now contact socket element and auxiliary spring sleeve are manufactured together in one operation. Since they are integrally formed, that is already connected to each other during manufacture, they can be transported together, stored and fed to the further processing steps. This considerably simplifies handling compared to handling two different parts. In addition, now eliminates the supply of two different materials or metal strips, which is usually necessary in the punching of two items. Overall, the production of contact sockets is thus significantly simplified by this method and brings corresponding cost advantages.

• b) Formen des Kontaktabschnitts nach dem Ausstanzen und anschließend
• c) Biegen des Stegs um etwa 180° und anschließend
• d) Ausbilden der den Kontaktabschnitt umklammernden Hilfsfederhülse.

A preferred development of the method according to the invention provides the following steps:

• b) shaping the contact section after punching and then
• c) bending the web by about 180 ° and then
• d) forming the auxiliary spring sleeve clasping the contact portion.

• a) mindestens eine der vorstehenden Kontaktbuchsen gemäß der Erfindung und
• b) ein Gehäuse, in dem die Kontaktbuchse angeordnet ist.

The engraver bush according to claim 11

• a) at least one of the above contact sockets according to the invention and
• b) a housing in which the contact socket is arranged.

The advantages of this contact socket arise from the above description of the advantages of the contact socket according to the invention.

An advantageous embodiment of the socket according to the invention provides that the contact socket is firmly connected to the housing, in particular locked, preferably by means of at least one of the contact socket, in particular on the auxiliary spring sleeve, formed latching tongue. This is to ensure the long-term stability of the socket even with external load.

• a) mindestens eine der vorstehenden Steckerbuchsen gemäß der Erfindung und
• b) mindestens einen Steckerstift, der zum Einführen in den Hohlraum des Kontaktabschnitts des inneren Kontaktbuchsenelements der Kontaktbuchse der Steckerbuchse ausgebildet ist.

The electrical connector according to claim 13

• a) at least one of the above sockets according to the invention and
• b) at least one plug pin which is designed for insertion into the cavity of the contact portion of the inner contact socket element of the contact socket of the socket.

According to an expedient development of the electrical connector according to the invention, the outer dimensions of the Stekkerstifts correspond to the inner dimensions of the cavity of the contact portion of the inner female contact element such that between the male pin and inner female contact element a releasable positive and / or non-positive mechanical connection is formed or formed and an electrical connection is formed or can be formed.

This training allows secure contact between socket and pin even in harsh environmental conditions, such as strong temperature fluctuations, shocks and / or moisture.

FIG 1

eine Draufsicht auf die Längsseite einer Ausführungsform einer Kontaktbuchse gemäß der Erfindung,

FIG 2

eine Draufsicht auf die Vorderseite der Kontaktbuchse gemäß FIG 1,

FIG 3

eine Schnittdarstellung der Kontaktbuchse gemäß FIG 1 und FIG 2 entlang der Linie A-A in FIG 2,

FIG 4

eine Schnittdarstellung der Kontaktbuchse gemäß FIG 1 und FIG 2 entlang der Linie B-B in FIG 1, und

FIG 5

die Kontaktbuchse gemäß FIG 1 und FIG 2 als Stanzteil.

The invention will be explained below with regard to further features and advantages with reference to the description of exemplary embodiments and with reference to the accompanying drawings. Show it

FIG. 1

a plan view of the longitudinal side of an embodiment of a contact socket according to the invention,

FIG. 2

a top view of the front side of the contact socket according to FIG 1,

FIG. 3

1 is a sectional view of the contact bush according to FIG. 1 and FIG. 2 along the line AA in FIG. 2,

FIG. 4

a sectional view of the contact socket according to FIG 1 and FIG 2 along the line BB in Figure 1, and

FIG. 5

the contact socket according to FIG 1 and FIG 2 as a stamped part.

1 shows a top view and on the longitudinal side and FIG 2 is a plan view of the front of an embodiment of a contact socket 2 according to the invention. From Figure 1, the longitudinal extent of the contact socket 2 along a longitudinal axis 7 can be seen. The contact socket 2 comprises an inner contact socket element 3 which has a contact section 4. The contact portion 4 defines a tubular cavity 5 of substantially circular cross-section for receiving a connector pin (not shown). In the manufacture of the contact socket 2, this cavity 5 is formed by rolling one or two corresponding punched sheet metal sections. Accordingly, the contact portion also has a groove extending parallel to the longitudinal axis 7 of the contact socket 2 (not shown). However, an embodiment of the cavity 5 with edges (not shown) is conceivable, so that the Cross section represents a polygon, for example a triangle, a rhombus, a rectangle or a square.

By inserting the plug pin (not shown) into the cavity 5 of the contact socket 2, an electrical contact between the plug pin and the contact socket 2, i. An electrical connector is closed. Conversely, pulling the plug pin out of the cavity 5 of the contact socket disconnects this electrical contact, i. the electrical connector is released or opened. It is clear that the shape and dimensions of the connector pin with shape and dimensions of the cavity 5 must correspond at least with respect to the cross section.

In FIG 1 and FIG 2 it can be seen that the contact portion 4 of the contact socket 2 is clasped by an auxiliary spring sleeve 6, and that completely. The longitudinal extent of the auxiliary spring sleeve 6 parallel to the longitudinal axis 7 of the contact socket 2 corresponds to the corresponding longitudinal extent of the contact portion 4 and thus of the cavity 5. The auxiliary spring sleeve 6 is like the contact portion 4 tubular and elongated parallel to the longitudinal axis 7 of the contact socket 2. The auxiliary spring sleeve 6 also has a substantially circular cross-section. The preparation of the auxiliary spring sleeve 6 is analogous to the contact portion 4 by rolling at least one corresponding punched sheet metal section, whereby the auxiliary spring sleeve 6 has a joint (not shown) parallel to the longitudinal axis 7 of the contact socket 2. In FIG. 1, the auxiliary spring sleeve 6 conceals the contact section 4, so that its representation in this area takes place with dashed lines.

Its function is inter alia, a bending of the contact portion 6, for example, in case of improper insertion or withdrawal of a connector pin, to prevent. Thus, it is clear that the shape and dimensions of the auxiliary spring sleeve with shape and dimension of the contact portion, at least with respect to the cross section, must correspond.

FIG. 1 and FIG. 2 further show that the inner contact sleeve element 3 and the auxiliary spring sleeve 6 together define a front edge 8 of the contact socket 2. At this front edge 8, the inner female contact element 3 and the auxiliary spring sleeve 6 are connected to each other via a web 9, which is bent by 180 °. Thus, inner female contact element 3 and auxiliary spring sleeve 6 and web 9 are integrally formed. During production, these sections of the contact socket are punched out in a punching process and as a coherent part of a piece of sheet metal. The material used is usually a copper-tin alloy (CuSn) and / or a copper-iron alloy (CuFe).

FIG. 1 also shows a fixing lug 19 formed on the auxiliary spring sleeve 6, specifically on the side of the auxiliary spring sleeve 6 opposite the front edge 8. This fixing lug 19 corresponds to a recess 19a in the contact section 4. The auxiliary spring sleeve 6 is connected to this fixing lug 19 fixed to the contact portion 4 of the inner female contact element 3. This is done in the manufacture by pressing the fixing tab 19 against the contact portion 4 after the auxiliary spring sleeve 6, the contact portion 4 clasps. As a result, the fixing lug 19 engages in the recess 19a and in this way forms a positive and / or non-positive connection between auxiliary spring sleeve 6 and contact section 4.

In FIG 1 and FIG 2, a plurality formed on the contact portion 4 contact spring arms 10 are shown. These contact spring arms 10 are formed by longitudinal cuts 11 in the contact section 4. The contact spring arms 10, in Figure 2 exactly seven contact spring arms 10 are evenly distributed around the circumference of the contact portion 4 and project into the cavity 5 of the contact portion 4 inside. The function of the contact spring arms 10 is inter alia the contacting of plugged into the cavity 5 connector pins, in particular the formation of a stable and reliable even under harsh environmental conditions contacting.

Furthermore, a first type of locking tongues 12 and a second type of locking tongues 13 can be seen in FIG. 1 and FIG. Both types of locking tongues 12, 13 rise radially outward over the outer surface of the auxiliary spring sleeve 6, in particular, they are bent from the outer surface of the auxiliary spring sleeve 6. Their function is the locking of the contact socket 2 with a in the manufacture of a socket over the contact socket 2 drawn housing (not shown), usually made of plastic. At the same time the locking tongues 12, 13 to ensure the centering of the contact socket 2 in this case. As a result, a stable connection between the contact socket 2 and housing is to be formed, whereby a safe and reliable socket is created even under harsh environmental conditions and strong external stress.

It can be seen from FIG. 1 that the first and second types of latching tongues 12, 13 are bent essentially in planes parallel to the longitudinal axis 7 of the contact bushing 2. However, first type of locking tongues 12 and second type of locking tongues 13 are bent in the opposite direction from the outer surface of the auxiliary spring sleeve 6. Also, the bending angle 14, 15 between the two types of locking tongues 12, 13 differs. This can best be seen in FIG. In the first type of locking tongues 12, the bending angle 14 is between 10 ° and 15 °, in the second type of locking tongues 13, the bending angle 15 is about 90 °.

In FIG. 1, a clamping section 16 formed on the inner contact sleeve element 3 is also shown. This clamping portion 16 serves to connect the contact socket 2 to an electrical line (not shown), for example, an optionally stripped to the end to be connected cable or a wire. The clamping portion 16 is formed at the opposite end of the contact portion 4 of the inner female contact element 3. The clamping portion 16 includes an open channel 17 and a pressing portion 18. For attachment, the electrical line is placed in the open channel 17 and clamped by pressing the Andrückabschnitts 18 in the channel 17.

FIG. 3 shows a sectional illustration of the contact socket 2 along the line AA in FIG. 2. The inner contact socket element 3 with the contact section 4 and the clamping section 16, which comprises the open channel 17 and the pressing section 18, can be seen once again. Also shown are the contact spring arms 10 and the two types of locking tongues 12, 13. In Figure 3, in particular the already mentioned different bending angles 14 and 15 of the two types of locking tongues 12, 13 can be seen. Next, the fixing tab 19 and the recess 19a corresponding to the fixing tab 19 is indicated.

4 shows a sectional view of the contact socket 2 along the line B-B in FIG. 1. This illustration shows an enlarged view of the clamping section 16 with its open channel 17 and the pressing section 18 arranged on the open channel 17.

5 shows the contact socket 2 as a stamped part 20, i. directly after punching out of a metal sheet and before further forming the contact bushing 2, for example by shaping, in particular rolling the contact section 4 and the auxiliary spring sleeve 6. It can be clearly seen how a first sheet metal section 21, which will later form the inner contact socket element 3, via the web 9 with a second sheet metal section 22, which will later form the auxiliary spring sleeve 6, is integrally connected. Next are the longitudinal sections 11 in sheet metal section 21 for forming the contact spring arms 10 and first pre-punctures 24 for forming the first type of locking tongues and second pre-cuts 25 for forming the second type of locking tongues 13. Also shown are third pre-cuts 26 in the second sheet section 22 for Formation of the fixing tabs 19, which correspond to the recesses 19 a already recognizable in the first sheet metal section 21 when the contact socket 2 is formed. With the first sheet metal section 21, a third sheet metal section 23 is further connected, which will form the clamping section 16 after the formation of the contact socket 2. FIG. 5 illustrates the one-piece construction of the contact bushing 2 to be produced or produced from the illustrated stamped part 20.

Overall, a contact socket 2 is thus created with the present invention, which has optimized contacting properties and at the same time is simple and inexpensive to produce. Among other things, the optimized contacting properties result from the fact that the contact bush 2 folds the inner contact bushing element 3 and the auxiliary spring bushing 6, which folds over the contact section 4 of the inner contact bushing element 3 is, has. In this way, the latching tongues 12, 13 required for latching with a housing can be formed on the auxiliary spring sleeve 6. Thus, the entire material of the contact portion 4 for the formation of an optimal contact, for example, by the contact spring arms 10, available, an impairment by the formation of locking lugs in the contact section 4 is no longer given. For example, a larger number of contact spring arms can be formed in this way. Conversely, thereby the locking tongues 12, 13 can be optimally trained and arranged on the auxiliary spring sleeve without being affected by the arrangement of contact spring arms. In this way, an optimal locking and centering of the contact socket 2 with or in the housing is made possible in the production of the socket. For example, the formation of a larger number of locking tongues is now possible. In contrast, in ordinary, only one layer of material contact bushes contact spring arms and locking tongues must be formed from only one layer of material, making compromises in training required and therefore makes optimal training both the contact spring arms and the locking tabs impossible.

LIST OF REFERENCE NUMBERS

2

Contact socket

3

inner contact socket element

4

Contact section

5

cavity

6

Auxiliary spring sleeve

7

Longitudinal axis of the contact socket 2

8th

front edge of the contact socket 2

9

web

10

Contact spring arms

11

longitudinal sections

12

first kind of locking tongues

13

second kind of locking tongues

14

Bending angle of the first kind of locking tongues 12

15

Bending angle of the second type of locking tongues 13

16

clamping section

17

open channel

18

pressure application

19

fixing flap

19a

recess

20

Stamped part (female contact 2 as stamped part)

21

first sheet section for inner contact socket element 3rd

22

second sheet section for auxiliary spring sleeve. 6

23

third sheet metal section for clamping section 16

24

first pre-punches for the formation of the first type locking tongues 12th

25

second pre-punches for the formation of the second type locking tongues 13th

26

third pre-punches for the formation of the fixing tabs 19

Claims (13)

1. Contact socket (2) comprising

   a) an inner contact socket element (3) comprising at least one contact section (4), and which defines at least one cavity (5) for receiving a pin, and

   b) at least one auxiliary spring sleeve (6), which at least partly surrounds the contact section (4),

   c) wherein the contact section (4) and the auxiliary spring sleeve (6) are designed to be elongated and essentially tubular,

   d) wherein inner contact socket element (3) and auxiliary spring sleeve (6) are designed to be integral, and

   e) wherein inner contact socket element (3), the contact section (4), and auxiliary spring sleeve (6) together define a front edge (8) of the contact socket (2) and are connected to one another at this front edge (8).
2. Contact socket according to claim 1, characterised in that a connection between inner contact socket element (3) and auxiliary spring sleeve (6) guaranteeing the integral design, is formed by a bar (9) which is designed integrally with inner contact socket element (3) and auxiliary spring sleeve (6) and which is bent or can be bent, in particular which is bent or can be bent by about 180°.
3. Contact socket according to one of claims 1 to 2, characterised in that at least one fixing flap (19) for fixing the auxiliary spring sleeve (6) on the contact section (4) is formed on the auxiliary spring sleeve (6), in particular on the side of the auxiliary spring sleeve (6) facing away from the front edge (8), which at least one fixing flap (19) engages in the contact section (4) for fixing in particular in a recess (19a).
4. Contact socket according to one of claims 1 to 3, characterised in that the contact section (4) has one or more contact spring arms (10) running parallel to the longitudinal axis (7) of the contact socket (2), which are formed by longitudinal slots (11) in the contact section (11) and which form in each case at least one contact projection for contacting the pin and which projects into the cavity (5) of the inner contact socket element (3).
5. Contact socket according to claim 4, characterised in that a plurality of contact spring arms (10), in particular seven contact spring arms (10), are distributed essentially uniformly about the periphery of the contact section (4).
6. Contact socket according to one of claims 1 to 5, characterised in that the auxiliary spring sleeve (6) surrounds the contact section (4) along its entire length, in particular in that auxiliary spring sleeve (6) and contact section (4) have essentially the same length.
7. Contact socket according to one of the preceding claims, characterised in that at least one catch tongue (12, 13) being raised in particular radially outwardly beyond the outer surface of the auxiliary spring sleeve (6) and preferably bent away from the outer surface for locking the contact socket (2) with the housing, is formed on the auxiliary spring sleeve (6).
8. Contact socket according to claim 7, characterised in that two different types of catch tongues (12, 13) are provided, which are bent out in opposite direction from the outer surface of the auxiliary spring sleeve (6), wherein in particular the size of the bending angles (14,15) differs in the two types of catch tongues (12, 13), and preferably the bending angle (14) of the one type (12) lies between 60° and 120°, in particular between 80° and 100°, preferably at about 90°, and/or the bending angle (15) of the other type (13) lies between 1° and 40°, in particular between 5° and 20°, preferably at about 10°.
9. Process for producing a contact socket according to one of claims 1 to 8, characterised by the following step:

   a) integral punching-out of inner contact socket element (3) and auxiliary spring sleeve (6) from a sheet metal, wherein inner contact socket element (3) and auxiliary spring sleeve (6) are designed to be integral after punching-out, are connected to one another via a bar (9).
10. Process according to claim 9, characterised by the following steps:

    b) shaping the contact section (4) after punching-out and then

    c) bending the bar (9) by about 180° and then

    d) forming the auxiliary spring sleeve (6) surrounding the contact section (4).
11. Plug socket comprising

    a) at least one contact socket (2) according to one of claims 1 to 8 and

    b) a housing, in which the contact socket (2) is arranged.
12. Plug socket according to claim 11, characterised in that the contact socket (2) is firmly connected to the housing, in particular locked, preferably by means of at least one catch tongue (12, 13) formed on the contact socket (2), in particular on the auxiliary spring sleeve (6).
13. Electrical plug connection comprising

    a) at least one plug socket according to one of claims 11 or 12 and

    b) at least one plug pin, which is designed for introduction into the cavity (5) of the contact section (4) of the inner contact socket element (3) of the contact socket (2) of the plug socket.

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