Fuel injection nozzle for internal combustion engines

Details Fuel injection nozzle for internal combustion engines Fuel injection nozzle for internal combustion engines

1991-05-06

1992-11-10

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

2395854, F02M 4700, B05B 130

Patent

active

051617420

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates a fuel injection nozzle for internal combustion engine. In known injection nozzles of this generic type (DE-A 35 15 264), the chamber in the nozzle holder receiving the closing spring is connected with a leakage or overflow oil connection via a duct which is guided through the magneto armature, the coil core in the induction coil, the wire guide body, and the installation duct of the needle movement sensor. In this construction the coil winding of the induction coil is not sealed relative to the overflow oil passage, so that the coil winding must be constructed so as to be resistant to fuel. Moreover, the side of the coil core remote of the closing spring is lengthened beyond the connection points of the coil winding with the connection wires, and the ground or short-circuit body is also drawn away in the axial direction over these connection points. There is accordingly a relatively great space requirement in the axial and radial directions, wherein only a relatively narrow annular surface is available at the nozzle holder for supporting the closing spring along the short-circuit body and the clamping flange of the coil core. More space would be required for the needle movement sensor in the axial direction of the injection nozzle if the coil winding were to be sealed relative to the overflow oil passage in this construction.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a fuel injection nozzle of the above mentioned general type which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a plastic injection nozzle for internal combustion engines, in which an annular gap between a short-circuit body of a needle movement sensor and a wall of a bore hole in a nozzle holder, which bore hole receives the short-circuit body, is sealed by means of a sealing ring which preferably sits in an annular groove at the circumference of a portion of the short-circuit body guiding a magneto armature of the needle movement sensor, a coil core of an induction coil of the needle movement sensor projects slightly over an end face of a coil winding facing the closing spring, a chamber in the short-circuit body which receives the induction coil is lengthened beyond the end face of the coil winding facing the closing spring, a sealing ring which seals the induction coil against a guide gap of the magnetic armature in the short-circuit body, is inserted into the lengthened portion of the chamber of the short-circuit body receiving the induction coil, and a chamber in the nozzle holder receiving the closing spring, into which chamber the borehole receiving the needle movement sensor opens, is connected with an overflow oil connection via a duct in the nozzle holder laterally circumventing the needle movement sensor.
The arrangement, according to the invention, has the advantage that the coil winding of the induction coil is sealed in a faultless manner relative to the chamber in the nozzle holder receiving the closing spring without more space being taken up in the axial direction of the injection nozzle than in the known arrangement. Accordingly, this saves the additional space required for accommodating the two sealing rings in that the coil core is also offset into this space, and the needle movement sensor can therefore be constructed in the area of the connection points of the coil winding with the connection wires without being impeded by the coil core.
A particularly compact construction results when the coil body is provided with a annular collar which projects into the lengthened portion of the chamber in the short-circuit body, tightly contacts the projecting end of the coil core, and carries the sealing ring.
The installation of the needle movement sensor into the nozzle holder along with the connection wires already connected with the coil winding is facilitated if the wire guide body is l

REFERENCES:
patent: 4502326 (1985-03-01), Kaczynski
patent: 4545530 (1985-10-01), Hofmann et al.
patent: 4546739 (1985-10-01), Nakajima et al.
patent: 4573349 (1986-03-01), Slindee
patent: 4575008 (1986-03-01), Kaczynski
patent: 4638659 (1987-01-01), Schiessle et al.
patent: 4646975 (1987-03-01), Horn
patent: 4770346 (1988-09-01), Kaczynski
patent: 5046472 (1991-09-01), Linder

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