Housing for a pyromechanical disconnecting device with integrated ignition element

The invention relates to a pyromechanical disconnecting device, in particular for battery shutoff in a motor vehicle, having a housing in which there is arranged a conductor bus that is designed to be severable by a cutting chisel at a predetermined cut position, the cutting chisel being capable of being accelerated by the propellant gases of an ignition element.

The technical embodiment of a pyromechanical disconnecting device is known in which the electrical ignition element is located in the housing as an external assembly that is inserted in a complicated and cost-intensive assembly process.

According to the invention this disadvantage is remedied in that the housing is extruded around the ignition element, which in this way forms one structural unit with the housing. In this way the entire procedure of inserting the ignition element into the housing becomes unnecessary.

Thus the extrusion around the ignition element simultaneously has the function of a housing for a pyromechanical disconnecting device.

In a preferred embodiment the housing is made of an electrically insulating material, in particular a plastic.

Strength-enhancing fillers such as glass fibers or carbon fibers are advantageously arranged in the insulating material.

According to the invention the housing is not extruded around the connecting pins of the ignition element for electrical contacting or said pins are arranged in a recess of the housing.

In one embodiment the connecting pins of the ignition element are insulated from one another. This may be necessary because of the material properties of the housing.

In the region of the ignition element the interior of the housing preferably has a peripheral recess for attaching the cutting chisel.

In a particular embodiment a peripheral groove is arranged in the peripheral recess on the side facing toward the ignition element, in which groove a seal ring is accommodated. This seal ring can be for example an O-ring.

In what follows, the invention is described in more detail with reference to two drawings in which:

FIG. 1 shows a portion of an embodiment of pyromechanical disconnecting device of the present invention; and

FIG. 2 shows an embodiment of pyromechanical disconnecting device of the present invention used for e.g., a battery shut off in a motor vehicle;

FIG. 1 shows a portion of a pyromechanical disconnecting device for battery shutoff in a motor vehicle, having an ignition element 2 , housing 1 being extruded around said ignition element, which in this way forms one structural unit with housing 1 . Housing 1 is made of an electrically insulating material such as plastic in which strength-enhancing fillers, in particular glass fibers or carbon fibers, are contained.

Housing 1 is not extruded around connecting pins 5 for electrical contacting but said pins are arranged in a recess 6 of housing 1 and are in this case fashioned as a plug connector 7 or respectively connected to a plug connector 7 .

In the interior of housing 1 (see FIG. 2 ) there is a receiving space 8 for receiving a cutting chisel 12 and a conductor bus 11 , conductor bus 11 being designed to be severable by cutting chisel 12 at a predetermined cut position. Cutting chisel 12 is accelerated toward the predetermined cut position by propellant gases arising upon the firing of ignition element 2 .

So that cutting chisel 12 can be encompassingly attached to ignition element 2 , a peripheral recess 9 is arranged in receiving space 8 in housing 1 in the region of ignition element 2 , an annular projection 10 of housing 1 being arranged between ignition element 2 and recess 9 . Arranged in peripheral recess 9 on the side facing toward ignition element 2 is a peripheral groove 3 in which a seal ring 4 is accommodated. This peripheral groove 3 is accordingly arranged in annular projection 10 toward recess 9 . Cutting chisel 12 is attached in this recess 9 and thus encompasses ignition element 2 .