EP3503307A1 - Electrical coupling part and sealing element - Google Patents

Abstract

An electrical coupling part is proposed which has a contact carrier made of plastic and has a through hole. An electrical contact element is connected to a wire of an electrical line in the through hole. The wire is led out of the through hole of the contact carrier at one end of the contact carrier. The electrical coupling part is characterized in that a sealing element equipped with radially outwardly projecting sealing lips is attached to the wire and, in the assembly position, bears against the wall of the corresponding through hole of the contact carrier. At the end of the sealing element, which faces away from the contact element closed to the corresponding wire in the assembly position, a support body is inserted into the sealing element, which has a through opening for the wire and at least three arms that are spaced apart in the circumferential direction and extend radially outward. A corresponding sealing element is also proposed.

Description

area

The invention relates to an electrical coupling part according to the preamble of patent claim 1 and a sealing element. Furthermore, the invention relates to a method for producing an electrical line with a coupling part according to the invention.

background

Such an arrangement is for example from the EP 2 099 099 B1 out.

"Coupling" in the context of the invention may be a plug with pins or a box with can contacts. "Contact elements" are thus either the plug pins or the can contacts. In addition to constructions in which these contact elements are firmly embedded in insulating material, there are arrangements in which the contact elements are inserted into through holes of prefabricated contact carriers made of insulating material. The reasons of cost usually very simple, such as metal strips, shaped contact elements may be equipped with a locking element, by which they are secured after insertion into the contact carrier against axial displacement. In such contact carriers measures must be taken to protect in particular the joints of contact elements and conductors of a connected line from moisture and the contact elements, if necessary, before the spray material of a protective body produced by injection molding.

From the US 5,590,463 A For example, there is a method of making an electrical connector with a thermoplastic material housing having a through opening. In the opening of the housing, a contact is arranged. At the contact can be a connecting wire can be connected via which the contact can be connected to a printed circuit. The connection wire may be the conductor of a cable. The contact is defined in the opening of the housing by the use of a heated tool, by means of which the material of the housing is displaced so that it presses against the contact.

As a result, the opening of the housing is sealed so that impurities can not pass. Thereafter, the wire is soldered to the protruding end of the housing from the housing. An insulating body is then injected around the junction between contact and wire, which extends to the housing and rests against the end face.

The initially mentioned EP 2 099 099 B1 describes an arrangement with an electrical coupling part with connected electrical line, which has at least two cores designed as insulated conductors. The coupling part has a contact carrier made of mechanically stable insulating material having at least two through-holes, in each of which an electrical contact element is arranged, which is connected to one of the electrical conductors of the provided with a sheath of insulating material line. Within the contact carrier, a sealing element with a press fit is mounted on each wire in the production of the coupling part, through which the respective through hole of the contact carrier is sealed. The contact carrier also has a pointing in the direction of the line approach to which a clamp body is attached, which clamps the wires of the line. Around the clamp body, an injection molded protective body of insulating material is formed, which extends over the sheath of the conduit. By the arrangement according to the invention, the through holes of the contact carrier should be sealed in a simple manner.

On this basis, it is an object of the invention to provide an improved coupling part and a sealing element for individual wires.

Summary of the invention

To solve this problem, the invention proposes a first aspect of an electrical coupling part according to claim 1.

The electrical coupling part according to the invention has a plastic contact carrier. In the through hole, an electrical contact element is connected to a wire of an electric wire. The wire has an electrical conductor surrounded by insulation. By through hole is arranged a contact element and the wire connected to the contact element. The wires are led out of the through hole of the contact carrier at one end of the contact carrier. The electrical coupling part according to the invention is characterized in that a sealing element equipped with radially outwardly projecting sealing lips is mounted on the wire, which rests in the mounting position on the wall of the corresponding through hole of the contact carrier, and in that at the end of the sealing element, the a mounting body is inserted into the sealing element in the mounting position facing away from the corresponding wire, a supporting body has a through opening for the wire and at least three circumferentially spaced from each other, radially outwardly extending arms which protrude in the radial direction over the sealing element ,

According to a second aspect, the invention proposes a sealing element for a wire with a through hole for the wire and with radially outwardly projecting sealing lips and with a support body inserted into the sealing element. The support body has a passage opening for the wire and at least three circumferentially spaced apart, radially outwardly extending arms which protrude in the radial direction over the sealing element.

According to a development, the electrical coupling part has at least two spaced and parallel through holes. In each Through hole, an electrical contact element is connected to one core of an electrical line. Each wire is sealed with a sealing element according to the second aspect of the invention.

The support body supports the wire and counteracts vibrations, line breakage and premature wear of the contacts. The single wire seal in the coupling part according to the invention is universally applicable and beyond machine-capable, i. the assembly is fully automatic feasible. Another advantage is that the seal in the coupling part according to the invention requires only slightly more space.

According to an expedient development of the support body is annular. This design is advantageous because most wires in electrical lines have a round cross section and the annular support body ensures a good support on the wire.

In an advantageous embodiment, the support body has a central ring on which the arms extending radially outward are arranged. The arms are in contact with the wall of the through holes in the contact carrier and thus ensure effective support of the wire in the contact carrier.

Advantageously, the sealing element has a flange with gaps through which the arms extend.

In a particularly advantageous embodiment, the arms extend obliquely at least in sections in the longitudinal direction of the sealing element, so that an envelope around the end faces of the arms of the supporting body forms a conical lateral surface. The end faces of the arms form in this way an inlet slope for the sealing element during assembly in the contact carrier. When inserting the sealing element is compressed because of the protruding arms of the support body. For this reason, the support body advantageously has slots in the support body in the longitudinal direction. In this case, have yourself wedge-shaped slots proved to be particularly advantageous, which allow a concentric compression of the support body with respect to the vein.

In a further development of the coupling part, the passage opening of the support body is conical. In this way, a tight fit of the support body is further promoted on the vein.

Advantageously, longitudinal grooves are provided in the sealing element. The longitudinal grooves allow the sealing element to be concentrically compressed upon insertion into a chamber in the contact carrier and to provide the sealing lips with a seal against the chamber wall.

Short description of the drawing

Fig.1

ein elektrisches Kupplungsteil mit einer angeschlossenen Leitung im Querschnitt;

Fig. 2

einen vergrößerten Ausschnitt eines Kontaktträgers des elektrischen Kupplungsteils aus Figur 1;

Fig. 3A

ein Dichtelement in einer perspektivischen Ansicht;

Fig. 3B

das Dichtelement aus Figur 3A in einer Ansicht von vorn;

Fig. 3C

das Dichtelement aus Figur 3A im Querschnitt entlang der Linie A-A aus Figur 3B; und

Fig. 3D

eine perspektivische Ansicht eines vergrößerten Ausschnittes aus dem Dichtelement aus Figur 3A.

The invention will be explained in more detail by way of example with reference to an embodiment with reference to the accompanying figures. All figures are purely schematic and not to scale. Show it:

Fig.1

an electrical coupling part with a connected line in cross section;

Fig. 2

an enlarged section of a contact carrier of the electrical coupling part FIG. 1 ;

Fig. 3A

a sealing element in a perspective view;

Fig. 3B

the sealing element FIG. 3A in a view from the front;

Fig. 3C

the sealing element FIG. 3A in cross section along the line AA FIG. 3B ; and

Fig. 3D

a perspective view of an enlarged section of the sealing element FIG. 3A ,

The same or similar elements are provided in the figures with the same or similar reference numerals.

embodiment

A contact carrier used in the arrangement according to the invention consists of a mechanically stable plastic, such as polyamide or polypropylene or polybutylene terephthalate. "Line" in the context of the invention may be a line with a common jacket surrounding the wires. But it can also consist only of the longitudinally interconnected wires.

Reference numeral 1 designates a contact carrier which has two parallel and mutually spaced through holes 2 and 3. In the through holes 2 and 3 contact elements 4 and 5 are arranged. The contact elements 4 and 5 can be designed as plug pins or sockets. To the contact elements 4 and 5 are electrical conductors 6 and 7 of two wires 8 and 9, which are insulated electrical conductors, an electrical line 10 is connected. As insulating materials for the wires, for example, polyvinyl chloride or crosslinked polyethylene can be used. The line 10 has in the illustrated embodiment, an insulating material, such as polyvinyl chloride or polyurethane, existing jacket 11, which surrounds the two wires 8 and 9 as a common jacket.

FIG. 2 shows an enlarged section 201 of the contact carrier 1 with three through holes 202-204. The cutout 201 only shows the region of the contact carrier 1 where the wires enter the contact carrier 1. In FIG. 2 For example, a wire 206 is shown. On the wire 206 sits a sealing element 207, which seals the wire 206 relative to the contact carrier 1. The through hole 202 forms a chamber in which the sealing member 207 is inserted with a slight interference fit. The sealing element 207 is made of, for example, silicone rubber VMQ.

The sealing element 207 is in FIG. 3A shown in a perspective view in greater detail. The sealing element 207 has a substantially cylindrical shape with a through hole 301 (FIG. FIG. 3B, FIG. 3C ), for the Passage of a wire, such as the wire 206. On a jacket 302 sealing lips 303a-303c are arranged, which rest in the mounting position on the wall of the through holes 202-204 contact body 201. At the in mounting position ( FIG. 2 ) in the contact part inside end of the jacket 302 of the sealing element 207 has an edge 304, which improves the stability of the shell 302. At the in mounting position ( FIG. 2 ) on the contact part 201 outer end of the sealing element 207, a three-piece flange 306 is arranged, which forms a peripheral edge of three segments 307a-307c, which are separated from each other by three spaces 308a-308b. In the region of the flange 306, an annular recess 309 is provided in the sealing element 207. The diameter of the recess 309 is larger than the diameter of the through hole 301, so that a seat 311 for a support body 312 is formed at the transition between the annular recess 309 and the through hole. The support body 312 is made of hard plastic material polyamide or polypropylene or polybutylene terephthalate. The support body 312 has a central ring 313 with three radially projecting arms 314 which form an angular distance of 120 ° from each other. In the central ring 313, a through hole 315 is provided whose diameter substantially corresponds to the diameter of the through hole 301. Slots 316 are disposed at equal angular intervals between the arms 314. The slots 316 are wedge-shaped, the wide side of which is located on the outer side of the support body 312 in the mounting position, as in FIG FIG. 3A is apparent. In the shell 302, at the circumferential positions where the slots 316 are located in the support body 312, wedge-shaped longitudinal grooves 317 are disposed in the shell. The longitudinal grooves 317 allow the sealing element 207 to be concentrically compressed when inserted into a chamber in the contact carrier and for the sealing lips 303a to 303c to seal against the chamber wall.

Between the edge 304 and the sealing lip 303 a, an ISO crimp 318 is arranged in the final assembled state of the sealing element 207, which is for a tight fit of the sealing element 207 ensures on the wire on which the sealing element 207 is mounted, while ensuring a good seal between the sealing element 207 and the wire.

How out FIG. 3B and particularly FIG. 3C As can be seen, the arms 314 extend beyond the outer periphery of the flange 306 and the segments 307a to 307c, respectively, on the outboard side in the mounting position, while the inboard side arms 314 are flush with the flange 306. The outer or inner side of the flange 306 in the assembly position is also referred to below as outer or inner side in the following. From the inner side to the outer side of the flange 306, the radial end face of the arms 314 extends linearly over the outer circumference of the segments 307a to 307c, up to a distance I from the inner side. The supernatant reaches a height d at this point. In other words, the arms 314 produce a conical envelope up to this point, which forms an inlet slope for mounting the sealing element 207 in the contact carrier. Farther outward, the distance between the outer periphery of the flange 306 and the end surfaces of the arms 314 does not increase further.

The inlet opening in the central ring 313 is also slightly conical and that the diameter of the central ring is slightly smaller on the outside than on its inside. This feature improves the clamping action of the central ring on a wire therein, as will be described below.

When the sealing element is inserted into a chamber in a contact carrier, the protruding arms 314 cause the support body 312, in particular the central ring 313, to be compressed concentrically, whereby the slots 316 become narrower. The central ring 313 clamps the vein firmly. In this way, the support body 312 supports the wire and counteracts vibrations, line breakage and premature wear of the contacts.

• Von einer Leitung wird ein Stück eines Außenmantels entfernt und die einzelnen Adern werden abisoliert. Dann wird ein Dichtungselement 207 auf jede Ader mit dem Flansch 306 voran auf die Ader geschoben und dort geparkt. An das abisolierte Ende der Ader wird ein Kontaktteil angeschlossen und danach das Dichtungselement 207 in einem vorbestimmten Abstand von dem Kontaktteil mit einem Isocrimp 318 befestigt. Dieser Vorgang wird für jede Ader wiederholt. Wenn alle Adern insoweit vorbereitet sind, werden sie in den Kontaktträger 1 eingesetzt, wo die Kontaktteile verrasten und die Dichtelemente 207 in die Kammern aufgenommen sind, sodass die Stützkörper 312 der Dichtelemente 207 jeweils eine Ader festklemmen und die oben genannten Vorteile erzielt werden.

The electrical coupling part according to the invention is assembled as follows:

• From a line a piece of an outer jacket is removed and the individual wires are stripped. Then, a seal member 207 is pushed onto each wire with the flange 306 on the wire ahead and parked there. A contact member is connected to the stripped end of the wire, and then the seal member 207 is fixed at a predetermined distance from the contact member with an Isocrimp 318. This process is repeated for each vein. If all wires are prepared so far, they are used in the contact carrier 1, where the contact parts engage and the sealing elements 207 are received in the chambers, so that the support body 312 of the sealing elements 207 each clamp a vein and the above advantages are achieved.

The single wire seal described is universally applicable and beyond machine capable, ie the assembly is fully automatic feasible. Another advantage is that the seal requires only slightly more space in the coupling part according to the invention.

LIST OF REFERENCE NUMBERS

1

contact support

2.3

Through Hole

4.5

contact elements

6.7

ladder

8.9

Vein

10

management

11

coat

201

Cutting contact carrier

202-204

Through holes

206

Vein

207

sealing element

301

Through Hole

302

coat

303a-303c

sealing lips

304

edge

306

flange

307a-307c

segments

308a-308c

interspaces

309

Annular recess

311

Seat

312

support body

313

Central ring

314

poor

315

Through opening

316

slot

317

longitudinal grooves

318

Isocrimp

Claims (11)

An electric coupling part comprising a plastic contact carrier (1) and a through-hole (2, 3; 202-204), in which through-hole an electrical contact element (4, 5) is connected to a wire (8, 9; 206) an electrical line (10) is connected, wherein the wire has an insulated electrical conductor (6, 7), wherein in the through hole, a contact element and the wire connected to the contact element is arranged, and wherein the wire at one end of the Contact carrier is led out of the through hole of the contact carrier, characterized - That on the vein equipped with radially outwardly projecting sealing lips (303a-303c) equipped sealing element (207) is mounted in the mounting position on the wall of the corresponding through hole (202-204) of the contact carrier (201), and - That at the end of the sealing element (207) facing away from the corresponding vein contact element in the mounting position, a support body (312) is inserted into the sealing element having a through opening (315) for the wire and at least three in the circumferential direction from each other complained, having radially outwardly extending arms (314) which protrude in the radial direction over the sealing element (207). Sealing element (207) for a wire (206) having a through hole (301) for the wire (206) and with radially outwardly projecting sealing lips (303a-303c) and with a in the sealing element (207) inserted support body (312), the a passage opening (315) for the wire (206) and at least three circumferentially spaced apart, radially outwardly extending arms (314) which protrude in the radial direction over the sealing element (207). Electrical coupling part according to claim 1, characterized in that the coupling part at least two at a distance and parallel to each other In each through hole, an electrical contact element (4, 5) is connected to a respective core (8, 9, 206) of an electrical line (10), and wherein each core with A sealing element according to claim 2 is sealed. Coupling part according to claim 1 or 3 or sealing element according to claim 2, characterized in that the supporting body (312) is annular. Coupling part or sealing element according to one of the preceding claims, characterized in that the supporting body (312) has a central ring (313) on which the radially outwardly extending arms (314) are arranged. Coupling part or sealing element according to one of the preceding claims, characterized in that the sealing element has a flange (306, 307a-307c) with gaps (308a-308c) through which the arms (314) extend. Coupling part according to claim 1 or sealing element according to one of the preceding claims, characterized in that the arms (314) in the longitudinal direction of the sealing element (207) at least partially oblique, so that an envelope around the end faces of the arms (314) of the support body (312) forms a conical lateral surface. Coupling part or sealing element according to one of the preceding claims, characterized in that the supporting body (312) in the longitudinal direction slots (316). Coupling part or sealing element according to one of the preceding claims, characterized in that the slots (316) extend in a wedge shape and allow a concentric compression of the support body (312) with respect to the wire (206). Coupling part or sealing element according to one of the preceding claims, characterized in that the passage opening (315) of the support body is conical. Coupling part or sealing element according to one of the preceding claims, characterized in that longitudinal grooves (317) are provided in the sealing element (207).

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