DE29809931U1 - Coding pen system - Google Patents

Description

GRÜNECKER, KINKELDEY, STOQKWIArR i

LAW FIRM

LAW FIRM MAXIMIUANSTRASSE 58 0-80538 MUNICH GERMANY

German Patent Office

Zweibrückenstr. 12
80297 Munich

Lawyers

DR. HERMANN SCHWANHÄUSSER

DR. HELMUT EICHMANN

GERHARD 8ARTH DR. ULRICH BLUMENRÖDER, LLM.

CHRISTA NIKLAS-FALTER

OR. MICHAEL SCHRAMM, DIPl.-PHYS.

DR. MAXIMILIAN KINKELDEY, LLM.

Of Counsel August Grünecker
or. gunter 8ez0ld
dr. walter langhoff

DR. WILFRIED STOCKMAIR (-1996)

Patent attorneys

European Patent Attorneys

DR. HERMANN KINKELDEY

DR. KLAUS SCHUMANN

PETER H.JAK08

WOLFHARD MEISTER

HANS HILGERS

DR. HENNING MEYER-PLATH

ANNELIE EHNOLD

THOMAS SCHUSTER

DR. KLARA GOLDBACH

MARTIN AUFENANGER

GOTTFRIED KLITSCH

OR. HEIKE VOGELSANG-WENKE

REINHARD KNAUER

DIETMAR KUHL

DR. FRANZ-JOSEF ZIMMER

BETTINA K. REICHELT

OR. ANTON K. PFAU

DR. UDO WEIGELT

RAINER BERTRAM

JENS C- KOCH, MS (U of PA). MS/ENSPM

YOUR SIGN/YOUR R£F.

OUR REF.

G 3908 -00142/cz DATE

03.06.1998

Applicant: Schaltbau Aktiengesellschaft Klausenburger Straße

81677 Munich

Coding pin system

TEL 089 / 21 23 50 ■ FAX (GR 4). 089 / 21 86 92 9Z ■ FAX (GR 3) 089 / 22 02 87 ■ http://www.grunecker.de ■ e-mail: postmaster@grunecker.de · TELEX 529 380 MONA D MAXIMILIANSTRASSE 58 ■ D-80538 MUNICH DEUTSCHE BANK MUNICH, NO. 17 51734, BLZ 700 700 10 SWIFT: DEUT DE MM

Coding pin system

The present invention relates to a coding pin system for connectors for coding at least one first connector parameter and a second connector parameter, with at least two pluggable coding pins, each coding pin comprising a fastening section which can be inserted into a receiving device of a connector component in several predetermined angular positions rotated about the coding pin axis, and a coding section which can be plugged over with a coding section of another coding pin for coding the same first and second connector parameters in such a way that coding surfaces of the coding sections which run parallel to the coding pin axis essentially lie on top of one another, the coding pin sections for coding the first connector parameter being arranged in a predetermined angular position rotated about the coding pin axis relative to the fastening section.

Such a coding pin system is known, for example, from EP 0 354 582 B1. The coding pin system described in this publication is used for multi-pole charging connectors, in particular for electric industrial trucks, their batteries or charging devices. The plug face of this charging connector essentially comprises two main contacts arranged parallel to one another and two pilot contacts arranged parallel to them, as well as a coding pin. The coding pin's main task is to encode the maximum permissible voltage level of such charging connectors, so that over-plugging with charging connectors with other maximum permissible voltages, in particular lower voltages, is prevented. In addition to this voltage coding, the coding pin should also encode another connector parameter. This parameter indicates whether it is a wet or dry charging system. When charging wet batteries, it is usual to circulate the electrolyte or exchange or top up the battery fluid in order to increase the charging efficiency. For convenience, the charging connector is therefore equipped with a fluid connector at the same time. This can be integrated into the charging connector face or designed as a piggyback system. In any case, it is necessary to ensure a distinction between a wet and dry charging system for dry batteries in which no fluid connector device is provided.

In the above-mentioned publication, the coding pin has a base section with a polygonal cross-section, which can be inserted into a correspondingly complementary receptacle in the connector housing in a manner that corresponds to the number of sides of the polygon. The polygon shape used determines the number of voltage codings. In one embodiment, the coding section of the coding pin has a halved cross-section of the same polygon shape. In order to distinguish between dry and wet charging systems, the coding areas of the coding pins for the wet charging connector are divided in the middle of the side surfaces of the polygon, whereas in the dry charging connectors the halving occurs along the corners of the polygon cross-section. The coding pins for the wet and dry systems differ, with the same voltage coding, in that the halving surface or coding surface of the coding section is arranged rotated by half the angle α around the coding pin axis. The angle α is the corner angle of the polygon shape used. This also means that the smallest blocking area, which will occur most frequently in practice, is characterized by a cross-sectional area of the polygon with half the angle α.

This design of the coding pins for wet and dry systems also opens up the possibility of providing a universal coding pin that can be plugged into both the wet charging plug devices and the dry charging plug devices with the same voltage coding. This is particularly advantageous for the charging plug device that is provided on the industrial truck for connecting the batteries. This plug device should be pluggable into both wet and dry batteries of the same voltage. The universal coding pin has a coding cross-section that has an area reduced by the previously mentioned minimum blocking area.

The coding pin system described above is the system for charging connectors that is currently established on the market. Although the publication describes the possibility of using a polygon shape with more than six edges, in practice only the use of a hexagon has been adopted, as this provides a blocking surface with sufficient safety. The use of a polygon shape with more than six edges is considered too unsafe. In addition, when the charging connector is plugged in, the coding sections are located in a correspondingly shaped housing cavity, so that they cannot move too far to the side. This is particularly important when two charging

Plug-in devices that do not have the same coding are to be plugged in, as this would result in considerable forces acting on the coding area.

Due to recent innovations in the battery sector, more and more batteries with higher voltages can be offered without compromising on the overall volume. This makes it necessary to increase the number of coding options for the voltages without sacrificing simultaneous coding for wet and dry systems. At the same time, however, sufficient security against incorrect connection must still be maintained.

It is therefore the object of the present invention to provide a coding pin system of the type mentioned at the outset, by means of which the coding options for a first connector parameter can be increased while maintaining the coding options for a second connector parameter, without having to accept significant losses with regard to a minimum blocking area.

This object is achieved according to the invention in that a first region of the coding surface is formed by a wave crest running parallel to the coding pin axis and a further region is formed by a wave trough running parallel to the coding pin axis, the contour of the surface of the wave crest and the contour of the surface of the wave trough being designed essentially axially symmetrically to the coding pin axis, and in that the second connector parameter is characterized by two coding states, the wave crest and the wave trough of the coding pin in the first coding state being arranged mirror-symmetrically to the wave crest and wave trough of a coding pin in the second coding state to a plane completely containing the coding pin axis.

This design ensures that the entire 360° range available for the angular position of a coding section can be used exclusively for coding the first connector parameter. This doubles the coding options.

Although an embodiment is also known from EP 0 354 582 B1, in which a coding pin for wet charging systems with a halved hexagonal cross-section as already described above is used and the coding pin for dry charging systems has a coding surface

in which a groove and a web protruding over the central plane are provided. The most common minimum blocking area then results only from the web cross-section protruding over the central plane. Such an embodiment could increase the number of voltage coding options, but this would be at the expense of the minimum blocking area, which is extremely small in this embodiment. For this reason, this embodiment could not establish itself on the market and is considered too unsafe.

The different coding between the first coding state and the second coding state of the second connector parameter is made possible in the present invention by a mirror symmetry of these two coding states. An angular range of 360° is therefore available for both coding pin states. When comparing the coding pin system used in practice to date with a coding pin system according to the present invention, where the coding section of both systems should have the same surface size, the coding pin system according to the invention has the same minimum blocking area, although the number of coding options for the first connector parameter is doubled. The degree of increase in coding options naturally depends on the optimization of the mirror-symmetrical shape of the coding sections in the first and second coding states. In such an embodiment, the minimum blocking area that is formed with respect to two coding pins with the same first connector parameter but different second connector parameters is even doubled compared to the previous system.

A particularly advantageous design is achieved by the contour of the coding surface perpendicular to the coding axis for the second coding state being S-shaped and the contour of the coding surface perpendicular to the coding axis for the first coding state being mirror-image S-shaped. This has the advantage that the blocking surfaces, which occur when the second connector parameter is the same and the first connector parameter is different, are crescent-shaped and not triangular as in the prior art. As a result, the blocking surfaces achieve a considerable width relatively close to the coding pin axis, which is almost constant over a larger area. This also leads to a more even distribution of force in the event of an incorrect plugging attempt. In the coding pin systems used to date,

The largest blocking area is in the outer area, which is why the buckling forces are also greater, which makes it easier for the coding section to avoid the obstacle.

In order to be able to use the area as fully as possible and to achieve better symmetry with regard to the loads, the entire cross section of a coding section can be designed to be essentially axially symmetrical to the coding pin axis in relation to the entire cross section of a pluggable coding section. In particular, in a combination with claim 2, this results in a cross-sectional division between the two pluggable coding sections that can be compared to a yin-yang pattern. This is an excellent optimization of the area utilization within the scope of the invention. To achieve this advantage, two pluggable coding sections can together form a circular cross section, with each coding section having a cross-sectional area essentially the size of half the circular cross section.

A considerable extension of the coding pin system is achieved by providing a coding pin with a universal coding section which can be plugged over with the coding sections for coding an identical first connector parameter and independently of the coding state of the second connector parameter, the angular position of which with respect to the fastening section and the cross-sectional size of which result from the size and position of the free cross-section which remains free when the cross-section of the coding section for the first connector parameter and first coding state of the second connector parameter and the cross-section of the coding section for the same first connector parameter and second coding state of the second connector parameter are superimposed. This free cross-section is created by the two wave valleys of the coding pins facing each other, whereas the wave crests overlap. Due to the fact that both cross-sections each cover half the area of the entire coding cross-section, a residual cross-section must inevitably remain free due to the superimposition of the wave crests. This residual cross-section is used to design the universal coding section. The actual cross-sectional shape of the universal coding section then depends on the degree of overlap between the two cross-sections.

According to one embodiment, a particularly large cross-section for the universal coding section is achieved by the two superimposed cross-sections on the outer

circumference of the circular cross-section leave a circular arc section free, which has an opening angle β of 60°, preferably 85°, starting from the coding pin axis. Such a cross-section has a considerable thickness over a relatively large area and thus sufficient stability.

The cross-section of the universal coding section created in this way ensures that the minimum blocking area is also maintained with regard to this section and that no compromises have to be made with regard to the other two cross-sectional shapes.

The fastening section can advantageously have a shape such that it can be inserted into the receiving device in predetermined angular steps around the coding pin axis. Such a design is advantageous because the angular steps preferably have the same size and precisely defined coding states can thus be generated.

Advantageously, the fastening section can have a polygonal cross-section for this purpose.

In order to save material, it is also possible for the fastening section to have a star-shaped cross-section. Such a star-shaped cross-section can be inserted into a star-shaped receptacle or into a plug-in receptacle with a polygonal cross-section.

Due to the available blocking surfaces, the fastening section can preferably have a shape so that it can be inserted into the receiving device in at least 8, preferably 12, coding positions.

Furthermore, the invention relates to a charging connector with a plug and a socket, each of which comprises a pluggable coding pin of the coding pin system according to one of claims 1 to 10. The coding pin system satisfies the rough plugging conditions present in charging connectors while at the same time providing a sufficient blocking area and a variety of coding options.

The invention further relates to a charging connector set with a coding pin system according to one of claims 1 to 10. This is characterized in that the first connector parameter identifies the charging voltage, that the first coding state of the second connector parameter identifies a dry charging system and that the second coding state of the second connector parameter identifies a wet charging system. While a universal coding pin is arranged on the vehicle, particularly when used in industrial trucks, so that both wet and dry batteries can be used in it, the coding options can be doubled compared to coding systems used to date in this field while maintaining an essentially identical blocking area. This allows the number of possible voltages of the various batteries to be increased, so that in the future batteries with previously unattainable voltages of the same size can also be included in the coding system.

For the sake of completeness, it should be noted that the connector parameters are freely interchangeable as long as this allows a reasonable coding to be achieved using the invention.

In the following, embodiments of the present invention are explained in more detail with reference to a drawing. In the drawings:

Fig. 1 is a perspective view of an embodiment of a coding pin,

Fig. 2 is a cross-sectional view of two pluggable coding sections for a dry charging system,

Fig. 3 is a cross-sectional view of two pluggable coding sections of a wet charging system with the same voltage coding as the dry charging system from Fig. 2,

Fig. 4 is a cross-sectional view of two pluggable coding sections, wherein a coding section of a wet charging system is plugged into a universal coding section,

Fig. 5 is a cross-sectional view of two pluggable coding sections, wherein a coding section of a dry charging system is plugged into a universal coding section and the same voltage coding is present as in Fig. 4,

Fig. 6 a cross-sectional view of an overlap in the case of a faulty connection attempt of wet and dry charging systems with the smallest possible blocking area,

Fig. 7 is a cross-sectional view showing the smallest possible blocking area in a known coding system with a hexagonal fastening section,

Fig. 8 is a cross-sectional view of a known coding system showing the smallest possible locking area when using an octagonal fastening section,

Fig. 9 is a cross-sectional view of a dry loading system showing the smallest possible blocking area when using a twelve-sided joint,

Fig. 10 is a cross-sectional view similar to Fig. 9 when using an octagon,

Fig. 11 is a cross-sectional view similar to Fig. 9 when using a hexagon,

Fig. 12 is a cross-sectional view of a dry loading system using a twelve-sided drive,

Fig. 13 is a cross-sectional view similar to Fig. 12 when using an octagon,

Fig. 14 is a cross-sectional view similar to Fig. 12 when using a hexagon,

Fig. 15 a cross-sectional comparison of the minimum blocking areas resulting from Figs. 1 to 7 and 12 to 14,

Fig. 16 is a cross-sectional view illustrating the design of a variant of a universal coding section, and

Fig. 17 is a representation of half of the additional cross-sectional area of the coding section compared to the variant from Figures 4 and 5.

Since the attachment and arrangement of a coding pin in a charging connector is generally known, e.g. from EP 0 354 582 B1, the charging connector and its receiving device for inserting and fastening the coding pin will not be described in detail and reference will be made to the state of the art in this regard.'

Fig. 1 shows a coding pin 1 which is divided along its coding pin axis A into a fastening section 2 with a polygonal cross-section and a coding section 3. Between the fastening section 2 and the coding section 3 there is generally a securing section 4 with a reduced cross-section which is used for axial securing in the housing of a charging connector. The axial securing is achieved, for example, via locking lugs which snap into the securing section 4. In the present case, the fastening section 2 has an octagonal cross-section. The receiving device in the charging connector then essentially comprises an octagonal opening into which the fastening section 2 can be inserted with a substantially precise fit. However, it should be noted at this point that the fastening section 2 can have any cross-section which allows it to be repositioned in the receiving device of the charging connector housing by a predetermined angle around the coding pin axis A. Preferred are cross-sections that allow repositioning in uniform angular increments, as is the case with a polygon cross-section. With an octagon, eight coding positions are available, which are determined by the fastening section. The coding pin 1 can be rotated by 45° around the coding pin axis A and arranged in different coding positions in the receiving device.

The coding section 3, like the fastening section 2, has a constant cross-section over its entire length and does not change with regard to its angular position to the coding pin axis A. The coding section 3 comprises a cylinder jacket-shaped outer surface 5 running coaxially to the coding pin axis A and a coding surface 6 running transversely in its width and parallel to the coding pin axis A in its length. The coding surface 6 has an S-shaped contour in cross-section, so that a wave crest 7 and a wave trough 8 are formed on the coding surface 6. The wave crest 7 and the wave trough 8 also have the same cross-section over their entire length in the direction of the coding pin axis A. The contours of the wave crest 7 and the wave crest 8 are designed in such a way that the contours of the wave crest 7 are axially symmetrical to the contours of the wave trough 8 with respect to the coding pin axis A. A small deviation is only provided so that the wave crest 7 of a complementary coding section of an associated coding pin can be accommodated in the wave trough 8.

Also important for the coding is the angular position of the coding surface 6, which is rotated around the coding pin axis A and its arrangement with respect to the fastening section 2. The angular position of the coding surface 6 with respect to the fastening section 2 was, as already explained above, used in the prior art to distinguish between wet and dry charging systems.

The coding is now explained in more detail with reference to Fig. 2 and 3. Fig. 2 shows the two cross sections of coding sections 3 that are intended for identifying a dry charging system. The reference number 31 identifies the coding section for a dry battery that is plugged into a charging connector. This coding section 31 can be plugged over with a coding section 41 of a coding pin 1 of a charging connector of a charging station for dry batteries. The angular position that the coding sections 31 and 41 assume with respect to the fastening section 2 ensures the voltage coding. Accordingly, the coding sections 31 and 41 can only be plugged over if the same voltage coding of a dry charging system is involved. With other voltage codings, the cross sections are then arranged rotated about the coding pin axis A.

From Fig. 2 it can also be seen that the two cross sections of complementary coding sections 31 and 41 complement each other to form a circular cross section. The wave crest 7 of the coding section 31 is located in the wave trough 8 of the coding section 41 and the wave crest 7 of the coding section 41 is located in the wave trough 8 of the coding section 31. Minus some roundings 9 and 10 due to manufacturing, the area of each coding section 31 and 41 corresponds to half the circular cross-sectional area. The contour of the coding surfaces 6 of these coding sections 31 and 41 is inverted or mirror-image S-shaped for the dry loading system. The coding sections 31 and 41 are completely axially symmetrical to each other with respect to the coding pin axis A. The turning point of the inverted S-shaped contour of the coding surface 6 is located in the immediate vicinity of the coding pin axis A.

Fig. 3 shows the cross-sectional ratios of pluggable coding sections 51 and 61 of a wet charging system. The coding section 51 belongs to a coding pin 1 of a charging connector of a wet battery, whereas the coding section 61 belongs to the coding pin 1 of an associated charging connector of a charging station for wet batteries. Both coding sections 51 and 61 are again designed to complement each other and have the same voltage coding. The difference to the coding sections 31 and 41 from Fig. 2 is that the coding pin sections 31 and 51 are arranged mirror-symmetrically to each other if they have the same voltage coding. The contour of the coding surfaces 6 of the coding sections 51 and 61 is therefore S-shaped and thus opposite to the coding for dry charging systems. This therefore creates a coding to distinguish between dry and wet charging systems. The coding sections 41 and 61 are also arranged in mirror symmetry if they have the same voltage coding. The mirror symmetry results from a theoretical superposition of the cross-sectional areas, e.g. of the coding sections 31 and 51, so that the coding pin axes A are brought into line. Mirroring then takes place through a plane that completely contains the coding pin axis A. This plane E is shown in the cross section in Fig. 6 and is explained again there.

From Fig. 4 and 5 it is clear that due to the cross-sectional design of the coding section 31 for the dry battery and the coding section 51 for the wet battery, with the same voltage coding, it is possible to use a universal coding

section 11 which can be plugged in with both the coding section 31 and the coding section 51 with the same voltage coding. The cross section of the universal coding section 11 results from an overlay of the cross sections of the coding sections 31 and 51 and is defined by the free cross section between the facing wave troughs 8. The universal coding section 11 then completely fills the wave trough 8 of the coding sections 31 and 51 respectively. This is used for a plug connector on an industrial truck which is to be plugged in with the charging plug connector of the dry battery or the wet battery. The distinction between dry and wet charging systems is only relevant for the charging process, whereas for the industrial truck it is irrelevant whether it is a dry or wet battery. Only the voltage coding must be ensured. The universal coding section 11 therefore has a predetermined angular position with respect to the coding pin axis A, which is coordinated with the angular positions of the coding sections 31 and 51 and can only be plugged onto them if the same voltage coding is present. The universal coding section 11, like the other coding sections, also has a constant cross-section over its entire length and is then followed by a fastening section 2 of the same design.

Fig. 6 shows a situation in which a coding section 61 of a charging connector of a charging station for wet batteries is incorrectly plugged into a coding section 32 of a charging connector of a dry battery. The coding section 32 is not only incorrect with regard to the coding of wet or dry charging system, but also with regard to the voltage coding. This situation was selected in order to represent the smallest possible blocking area 12 that can occur when dry and wet charging systems are confused.

From Fig. 6 it can be clearly seen that the coding sections 61 and 32 of dry and wet charging systems are characterized by a mirror symmetry with respect to the plane E, whereby the corresponding coding is achieved.

Based on Figs. 7 to 15, a comparison of the locking effects of the coding pin system described above with the state of the art is now carried out.

In Fig. 7, reference number 13 indicates the smallest blocking area that can occur in the state of the art when coding using halved hexagon cross-sections. This blocking area 13 is also shown in bold in Fig. 15 in the "6-digit" column and should be viewed as a 100% blocking area for comparison purposes. This is the minimum blocking area that exists in practice in charging plug systems. In the comparison now being made, "6-digit", "8-digit" or "12-digit" always means the number of edges that the fastening section 2 has and thus indicates the number of reconnection options in the receiving device.

Fig. 8 makes it clear why an octagon is not generally used. Here, the smallest blocking area 13' is only 68.5% of the blocking area 13 in Fig. 7. With a certain amount of force, it could be possible to over-lock it in rough everyday practice. At least the safety is not sufficient for practical purposes.

It should also be mentioned that the locking surfaces according to Fig. 7 and 8 widen continuously from the center outwards, which also causes the force to be distributed relatively unevenly.

Figs. 9 to 11 refer to a coding pin arrangement of a dry charging system and Figs. 12 to 14 to the coding pin arrangement of a wet charging system.

In Fig. 11 and 14 the smallest locking surface 12 is shown, which occurs when a hexagon is used as the fastening section 2. A comparison with the locking surface 13 shows that this is more than twice as large (216%).

In Fig. 10 and 13, an octagon has been used as the fastening section 2, so that a smallest blocking surface 12 can occur, which is still approximately 1.5 times as large as the blocking surface 13 from Fig. 7.

It is even possible to use a twelve-sided profile as the fastening section 2, so that a smallest locking surface 12 is obtained which is approximately the same size as the locking surface 13 in Fig. 7.

For the sake of completeness, it should be noted that the blocking area 12 in Fig. 6 is more than twice as large as the blocking area 13 in Fig. 7. This is also shown at the very bottom of the middle column (Fig. 15).

From the above it can be seen that for the voltage coding with the coding pin system described above, 12 voltage codings are possible without having to accept any loss in the size of the blocking area 12. In the current state of the art, only half as many voltage codings are possible. The fact that doubling the voltage codings does not lead to any loss in coding for wet and dry charging systems should not be neglected. Twelve voltage codings are available for each system.

The smallest blocking surfaces 12 shown in Fig. 9 to 14 only occur when charging connectors of the same charging system (wet or dry) with different voltage coding are to be improperly plugged in. The blocking surface 12 is sickle-shaped and very quickly takes on a considerable width starting from the coding pin axis A, so that a more even distribution of force also occurs on the blocking surface 12 in the event of an incorrect plugging attempt.

With regard to the comparison of the areas of the blocking surface 13 with the blocking surfaces 12, it should be noted that the coding pins are assumed to have the same external diameter, with the diameter of the polygon cross-sections being defined by the corners. The size relationships in Figs. 7 to 14 can therefore be regarded as true to scale.

In these figures it can also be seen that the coding sections are arranged in a housing section 13 which has an opening 14 whose diameter is only slightly larger than the outside diameter of the circular cross-section defined by the coding sections. As a result, each coding section can only deviate slightly laterally due to the action of a force in the area of the blocking surface 12, so that this remains essentially completely effective.

Fig. 16 and 17 show a variant in which a universal coding section 11 with a larger cross-section is formed by a larger overlap of the coding sections 31 and 51. Both the coding section 31 and the coding section 51

have been rotated by 11.25° around the coding pin axis A compared to the corresponding coding sections 31 and 51 in Fig. 2 to 5, so that an opening angle β of 77.5° is formed compared to 55° according to Fig. 4 and 5. The universal coding section 11 is thus given a slightly different cross-sectional shape, but an increase in area is achieved. This increase in area is symmetrical. Fig. 16 shows the simple increase in area compared to the previously described embodiment. This is a scale increased by a factor of 2. Fig. 15 clearly shows how the cross section of the universal coding section 11 results from the superposition of the cross sections of the coding sections 31 and 51. This enlargement of the cross section of the universal coding section 11 can be further increased by further rotating the coding sections 31 and 51 around the coding pin axis A. However, there are limits here, since sufficient security must be available for all types of coding. It is therefore not necessarily advisable to go beyond the form of the universal coding section 11 shown in Fig. 16.

It is important for the superposition according to Fig. 16 and the design of the universal coding section 11 from Figs. 4 and 5 that the coding sections 31 and 51 are shapes arranged mirror-symmetrically to the plane E, which represent the same voltage coding on the one hand for wet and on the other hand for dry.

The shape of the coding sections plugged into each other as shown in Fig. 2 and 3 (31 and 41 on the one hand and 51 and 61 on the other hand) can also be referred to as a Yin-Yang division.

Claims (12)

1. Coding pin system for plug connectors for coding at least one first plug connector parameter and one second plug connector parameter, with at least two pluggable coding pins ( 1 ), each coding pin ( 1 ) comprising a fastening section ( 2 ) which can be inserted into a receiving device of a plug connector component in a plurality of predetermined angular positions rotated about the coding pin axis (A), and a coding section ( 3 , 31 , 32 , 41 , 51 ) which can be plugged over with a coding section ( 3 , 31 , 32 , 41 , 51 , 61 ) of another coding pin ( 1 ) for coding the same first and second plug connector parameter in such a way that coding surfaces ( 6 ) of the coding sections which run parallel to the coding pin axis (A) essentially lie on top of one another, the coding pin sections for coding the first plug connector parameter being arranged in a predetermined angular position relative to the fastening section ( 2 ) around the coding pin axis (A) rotated angular position, characterized in that a first region of the coding surface ( 6 ) is formed by a wave crest ( 7 ) running parallel to the coding pin axis (A) and a further region is formed by a wave trough ( 8 ) running parallel to the coding pin axis (A), the contour of the surface of the wave crest ( 7 ) and the contour of the surface of the wave trough ( 8 ) being designed essentially axially symmetrically to the coding pin axis (A), and that the second plug connector parameter is characterized by two coding states, the wave crest ( 7 ) and the wave trough ( 8 ) of the coding pin ( 1 ) in the first coding state being arranged mirror-symmetrically to the wave crest ( 7 ) and wave trough ( 8 ) of a coding pin ( 1 ) in the second coding state being arranged mirror-symmetrically to a plane completely containing the coding pin axis (A). 2. Coding pin system according to claim 1, characterized in that the contour of the coding surface ( 6 ) perpendicular to the coding axis (A) is S-shaped for the second coding state and the contour of the coding surface ( 6 ) perpendicular to the coding axis (A) is mirror-image S-shaped for the first coding state. 3. Coding pin system according to claim 1 or 2, characterized in that the entire cross section of a coding section ( 3 , 31 , 32 , 41 , 51 , 61 ) is designed to be substantially axially symmetrical to the coding pin axis (A) in relation to the entire cross section of a pluggable coding section ( 3 , 31 , 32 , 41 , 51 , 61 ). 4. Coding pin system according to claim 3, characterized in that two pluggable coding sections ( 3 , 31 , 32 , 41 , 51 , 61 ) together form essentially a circular cross-section, each coding section having a cross-sectional area essentially the size of half the area of the half circular cross-section. 5. Coding pin system according to one of the preceding claims, characterized in that a coding pin ( 1 ) is provided with a universal coding section ( 11 ) which can be plugged over with the coding section ( 31 , 51 ) for coding an identical first connector parameter and independently of the coding state of the second connector parameter, the angular position of which with respect to the fastening section and the cross-sectional size of which result from the size and position of the free cross-section which remains free when the cross-section of the coding section ( 31 ) for the one first connector parameter and first coding state of the second connector parameter and the cross-section of the coding section ( 51 ) for the same first connector parameter and second coding state of the second connector parameter are superimposed. 6. Coding pin system according to claim 5, characterized in that the two superimposed cross sections leave a circular arc section free on the outer circumference of the circular cross section, which has an opening angle (β) of 60°, preferably 85°, starting from the coding pin axis (A). 7. Coding pin system according to one of claims 1 to 6, characterized in that the fastening section ( 2 ) has a shape such that it can be inserted into the receiving device rotated in predetermined angular steps about the coding pin axis (A). 8. Coding pin system according to claim 7, characterized in that the fastening section ( 2 ) has a polygonal cross-section. 9. Coding pin system according to claim 7, characterized in that the fastening section has a star-shaped cross-section. 10. Coding pin system according to one of claims 1 to 9, characterized in that the fastening section ( 2 ) has a shape so that it can be inserted into the receiving device in at least 8, preferably 12, coding positions. 11. Charging connector with a plug and a socket, each of which comprises a pluggable coding pin of the coding pin system according to one of claims 1 to 10. 12. Charging connector set with a coding pin system according to one of claims 1 to 10, characterized in that the first connector parameter identifies the charging voltage, that the first coding state of the second connector parameter identifies a dry charging system and that the second coding state of the second connector parameter identifies a wet charging system.