DE7919544U1 - Connection cable for an electrical device - Google Patents

Description

Il I I I I

R- 557 9

June 21, 1979 Ws / Hm

ROBERT BOSCH GMBH, 7000 STUTTGART 1

Connection cable for an electrical device, state of the art

The invention is based on a connection line for an electrical device according to the preamble of the main claim. In connection lines of electrical devices or extension cables, it is already known to use the stripped, to attach tinned conductor ends, for example, to the connector pins and then the connection point inject with the end of the connecting cable in the plug. The insulating material of the plug is with the ν welded outer insulating sleeve of the connection cable.

It is also known that the connection line on electrical devices in the engine compartment of a motor vehicle must be inserted into the electrical device as pressure-tight and moisture-tight as possible. According to the DE-OS 23 25 544 is the end of the connection line for this purpose encapsulated in the plastic housing of an inductive encoder. However, this solution has the disadvantage that especially at exposed places in the motor vehicle, the lines breathe through the strands and that on them With the air, also transport moisture into the interior of the

55 79 -

electrical device. In addition, the insulation of the individual wires is required because of the Temperature resistance made from a cross-linked, non-weldable material, so that when tinning the conductor ends they do not weld to the insulating sleeve. Consequently, the moist ^ activity here unhindered.

Advantages of the invention

The solution according to the invention with the characterizing features of the main claim has the advantage that the thermoplastic grommet sprayed onto the end of the line Plastic with the outer jacket of the cable |

end is welded and that the wire ends are protected against moisture penetration through the shrink tubing in the electrical device is protected. Another advantage is that the shrink tube also |

tightly seals the front area of the grommet, so that the moisture that gets through the braid also do not leak between the end of the shrink tubing and the grommet can.

The measures listed in the subclaims provide further advantageous developments and improvements the features specified in the main claim are possible. So it is particularly advantageous if the outer contour the grommet has several ring-shaped sealing lips which, when encapsulating the grommet with the insulating material housing of the electrical device.

drawing

An embodiment of the invention is shown in the drawing and in the following description explained in more detail. 1 shows the end of a connection

55 7 9

line with a pressure- and moisture-tight shell and FIG. 2, the connection line according to FIG. 1 with the connected electrical device and the grommet embedded in the insulating housing of the device.

Description of the embodiment

In Fig. 1, the end of a connecting line 10 for an electrical device is shown. The connecting line has two wires 11 and 12, which are surrounded by an outer plastic jacket 13. The wires 11 and 12 exist each of an insulating sleeve 14 and 15, in each of which an electrical conductor 16, 17 is embedded. Each of the two conductor ends 16a and 17a is stripped of its insulating sleeve 14 and 15, respectively, at the front. These are offset the wires 11 and 12 are stripped from the plastic jacket 13. The conductor ends 16a and 17a are used for connection to an electrical device.

Around the end of the connecting line 10 in the plastic housing of an electrical device to be introduced pressure-tight and moisture-tight, the cable end 10 is in an injection mold with a nozzle 18 made of a thermoplastic material, which during the injection molding process welded to the end portion 13a of the plastic jacket 13 and the protruding ends of the insulation 14a of the wires 14 and 15 encloses. The grommet is shown cut in Fig. 1 only up to the middle. Of the front area l8a of the grommet 18 encloses the two wires 11 and 12 of the connecting line individually like a pair of pants approximately up to the exposed conductor ends 16a and 17a. There is a piece over each of the conductor ends 16a and 17a Shrink tubing 19 pushed on, the area partially surrounding the front, the insulating sleeve end 14a 18a of the spout 18 encloses. The shrink tube 19

55 79

is provided with an inner layer that melts during the shrinking process, through which the shrink tube 19 completely seals the grommet 18 and the conductor end 16a or 17a by pressing the inner layer, which has become plastic through the shrinking process, into all the joints. Since the conductors 17 and the connection line 10 consist of a flexible wire, are the stripped conductor ends L6A, 17a plated to a solid conductor, and the pressure of the Isolierhüllenende I ¹ Ia adjoining area L6B from the heat-shrinkable tube 19 and moisture-tightly enclosed.

FIG. 2 shows the end of the connection line attached to an inductive pulse generator 20 shown in cross section 10. The pulse generator 20 is attached here as a speed sensor at an exposed point in the motor vehicle. It contains an induction coil 21, the connections of which are in contact with the conductor ends 16a and 17a of the connection line are. In an injection mold, the induction coil 21 and the end of the connecting line 10 are made of a plastic housing 22 encapsulated so that the line end 10 is embedded with the grommet in the plastic. To make the connection between To get the plastic housing 22 and the grommet 18 pressure-tight and moisture-tight, the outer contour is the Grommet 18 provided with several annular sealing lips 23, which, when embedded in the plastic housing 22 of the pulse generator 20, weld to the latter.

The solution according to the invention ensures that moisture neither on the outer contour of the grommet 18 through the plastic housing 22 into the interior of the Pulse generator 20 can get nor moisture can get through the conductor strands in the pulse generator 20. The latter is through the shrink tube 19 on each

55 7Ö

Head end l6a, 17a prevented. By welding the Sealing lips 23 of the grommet 18 with the plastic housing 22 of the pulse generator 20 are also a pressure-tight connection achieved ^ through which the connecting cable is also protected against mechanical stress.

It »

ita

R- 5 5 79

June 21, 1979 Ws / Hm

ROBERT BOSCH GMBH ₉ 7OOO STUTTGART 1

Connection cable for an electrical device summary

A connection line for an electrical device is proposed, which is inserted into the housing of the device in a pressure-tight and moisture-tight manner and the conductor ends of which are contacted in the housing. For this purpose, the connection line has a nozzle which is sprayed on at the end and which is welded to the conductor insulation. A shrink tube with a fusible inner layer is shrunk onto each of the conductor ends. The end of the lead is injected with its spout in the plastic housing of the electrical appliance, so that moisture either between spout and lead can not penetrate between spout and OEEM housing of the electrical appliance. In addition, the shrink tubing prevents moisture from penetrating through the conductor strand by sealing the grommet and conductor end through the inner layer that becomes plastic during the shrinking process.

Claims (4)

• ■ ■ · · · ■ ■ · ■ · ■ ι · · # R. 5 5 7 9 21.6.1979 Ws / Hm ROBERT BOSCH GMBH, 7OOO STUTTGART 1 claims 1. Connection line for an electrical device, the conductor ends of which is pressure- and moisture-tight to attach to the connection point of the device and which has a plastic jacket which comprises one or more wires, in the insulating sleeve of which the electrical conductor lies, each conductor end from its insulating sleeve and to it offset, the wire is stripped from the plastic jacket, characterized in that the cable end (10) is encapsulated with a grommet (18) made of thermoplastic material, which is welded to the end section (13a) of the plastic jacket (13) during the injection molding process and the protruding insulation jacket ends ( I ¹ Yes) encloses the wires (I ¹ J, 15), and that a shrink tube (18) pushed over the conductor end (l6a, 17a) and over the front area (l8a) of the grommet (18) surrounding ^{the insulating sleeve end (I 1 Yes)} 19) seals the grommet (18) and the conductor end (16a, 17a) with an inner layer that melts during the shrinking process. · 1 · t · Hit It · 1 · 111 tits it t> i 55 2. Connection line according to claim I _3, characterized in that with two wires (11, 12) the front region (18a) of the grommet (18 _{) encloses these wires (H 5} 12) individually like pants approximately up to the exposed conductor end (16a, l6b) . 3. Connection line according to claim 1 or 2, characterized in that the conductors (l6 ₃ 17) consist of a flexible stranded wire, the stripped ends (16a, 17a) of which are tinned to a solid conductor end and in which at the end of the insulation (I ¹ Yes, I ¹ Jb) adjacent area (16b) are enclosed by the shrink tube (19). 4. Connection line according to one of the preceding claims, characterized in that the outer contour of the grommet (L8) has a plurality of annular sealing lips (23), which when the grommet (18) is embedded in the plastic housing weld the electrical device to it.