Fuel injection valve

Details Fuel injection valve Fuel injection valve

1999-06-10

2000-08-22

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

239 90, 239 93, 239 95, 239 96, 239124, 2395337, F02M 4702

Patent

active

061058793

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a fuel injection valve for internal combustion engines. In one such fuel injection valve, known from the earlier German Patent Application, Serial No. DE 196 42 440.2, a pistonlike valve member can be displaced axially outward to a restoring spring in a bore of the valve body that protrudes into the combustion chamber. On its end toward the combustion chamber, the valve member has a closing head that protrudes out of the bore and forms a valve closing member and that on its end toward the valve body has a valve sealing face. With this valve sealing face, the valve member cooperates with a valve seat face disposed on the face end, toward the combustion chamber, of the valve body. Two rows of injection openings disposed one above the other are also provided on the closing head of the valve member; their outlet openings are covered in the closing direction of the valve member by the valve body and are uncovered in succession in the outward-oriented opening stroke. For defined uncovering of the individual rows of injection ports, the known fuel injection valve has a two-stage hydraulic stroke stop, which limits the opening stroke travel of the valve member and is embodied as a hydraulic damping chamber with openable relief. The relief line can be made to communicate with the damping chamber via two recesses on the valve member, and this communication can be opened in succession during the opening stroke motion of the valve member. To that end, the recesses in the known fuel injection valve are embodied as two plane polished sections on the valve member, which with their upper ends protrude into the damping chamber. The upper ends of the polished sections form control edges, which emerge successively from the coincidence with the damping chamber during the opening stroke motion of the valve member and are closed by the wall of the valve body. A first polished section communicates constantly, by its lower end, with the relief line, while the second polished section, with its lower boundary edge, does not plunge into the coincidence with the relief line until after a certain opening stroke motion has been traversed. In this way, in the known fuel injection valve, a two-staged hydraulic blocking of the valve member is attained; a first opening position at the damping chamber corresponds to the opening of the first row of injection ports, while the final, hydraulically blocked terminal position of the valve member corresponds to the opening of the two rows of injection ports and thus the opening of the entire injection cross section.
The known fuel injection valve has the disadvantage, however, that the recesses on the valve member must be made with great precision, in order to assure accurate uncovering of the rows of injection ports via the precise disposition of the many control edges. Furthermore, in the known fuel injection valve, the injection-pressure-dependent blocking of the valve member in intermediate positions cannot be set in an operationally dictated way, which means that complicated geometric adaptation work must be done for the hydraulic stroke stops. Thus the requisite control, for the so-called varioregister nozzles, of a multistage opening stroke course of the valve member as a function of the fuel injection pressure prevailing at the valve can be achieved only at very great engineering effort and expense.


ADVANTAGES OF THE INVENTION

The fuel injection valve of the invention for internal combustion engines, has the advantage over the prior art that the second opening stroke phase of the valve member is settable and controllable via a valve inserted into the relief line.
Furthermore, a third control edge that controls the onset of the second opening stroke phase can be dispensed with, so that the engineering effort and expense for the recesses on the valve member can be greatly reduced compared with the known embodiment. Reducing the control edges also brings about stable long-term operational performance because of the reduced variabilities as a consequence

REFERENCES:
patent: 2762654 (1956-09-01), Purchas, Jr. et al.
patent: 4182492 (1980-01-01), Albert et al.
patent: 5275337 (1994-01-01), Kolarik et al.

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