Werkzeugmaschinenfabrik Oerlikon-buhrle Ag

Panayotis Karayannis

Klaus Munzel

Hansjorg Naef

In an electronic fuze for a projectile the ignition energy, upon firing of the projectile, is produced by a generator and stored in a storage capacitor. An electronic circuit serving for the barrel safety i.e. to prevent premature detonation of the projectile in front of the barrel, delaying ignition upon impact, the delay-free ignition upon impact and the self-destruction of the projectile, controls the delivery of the energy stored in the capacitor to the detonator or ignition cap. To ensure that the energy of the storage capacitor is sufficient the electronic circuit of the fuze must work with extremely low current. This is realized by providing for the circuit a stabilizer, a switching-on element, resetting elements, blocking elements and time-delay elements, the stabilizer and time-delay elements being structured as solid-state circuits.

Electronic fuze

A spinning projectile containing an electromagnetic ignition current generator, comprising a fuze housing with an inner generator component fixed at the housing and possessing an armature coil and an outer generator component provided with a field magnet. A bearing arrangement having two bearing bodies is housed in a recess of the fuze housing, one of the bearing bodies being arranged at the fuze housing and the other forming part of the outer generator component. Both of the bearing bodies are substantially ring-shaped and possess essentially the diameter of the field magnet and form a bearing means for centering the field magnet. The fuze housing possesses a wall portion which bounds the inside of the recess which is constructed as a circumferential groove.

Spinning projectile equipped with an electromagnetic ignition current

An apparatus for generating an electrical ignition current in the fuze of a projectile to be fired from a weapon, comprising an induction coil arranged in the projectile, a magnet for generating a magnetic field, a bipartite yoke, one part of which is located at the projectile and the other part at the weapon barrel, for producing a change in the magnetic flux upon passage of the projectile through the weapon barrel. According to one embodiment the part of the yoke located at the weapon barrel comprises a number of ferromagnetic rings and paramagnetic rings arranged between the ferromagnetic rings. The part of the yoke located at the projectile body comprises a substantially cylindrical body member having a substantially disc-shaped flange for the reception of the induction coil as well as a soft iron disc. With this arrangement the magnet is a permanent magnet which is disposed between this cylindrical body member and the soft iron disc. The axis of the induction coil substantially coincides with the projectile axis, and the aforesaid ferromagnetic and paramagnetic rings are arranged at the end of the weapon barrel. It is possible, according to another embodiment, to use instead of a permanent magnet, an electromagnet located at the mouth of the weapon and containing such ferromagnetic and paramagnetic rings, with the yoke at the weapon barrel being in the form of a triple-arm yoke carrying two oppositely polarized electromagnetic coils.

Apparatus for generating an electrical ignition current in a fuze of a

An ignition current generator for an electrical projectile fuze comprising a soft iron ring which, viewed in the direction of the projectile, is secured at the rear end face of a substantially ring-shaped permanent magnet which is axially displaceable. The permanent magnet, in a first position thereof, surrounding an induction coil and bearing with its front end face or surface against a flange of a soft iron core. This soft iron core is provided at its outer circumference with a groove in which there is located the induction coil. The stroke of the permanent magnet is of a size such that in a second position of the permanent magnet the induction coil is located externally of the magnetic field produced by the permanent magnet, and the permanent magnet also in its second position is located upon the soft iron core.

Ignition current generator for an electrical projectile fuze

A safety device for a current generator of an electrical projectile fuze comprising a housing in which there are arranged a permanent magnet, an induction coil and a soft iron core. Of these components at least two are movable relative to one another. The movement preventing means comprise rods or the like which can buckle. The rods are secured at one end at a housing-fixed part and at the other end bear at the movable component and permit displacement of the aforementioned movable component first after overcoming the buckling resistance of the rods.

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Zurich, Switzerland

Panayotis Karayannis