Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Patent
1997-11-05
1999-12-07
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
239575, 2395905, F02M 6104
Patent
active
059969083
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection valve for internal combustion engines. A fuel injection valve of this kind, known from European Patent Disclosure EP 0,084,182, has an inflow conduit, leading away from a connection stub for a fuel injection line, that discharges at an injection opening into the combustion chamber of the engine to be supplied. For trapping dirt particles and chips in the fuel, a fuel filter is inserted into the inflow conduit and is embodied as a rod filter.
The rotationally symmetrical filter body has one collar on each of its two face ends, and the collar protrudes past a middle portion of the face of reduced diameter. Two groups of longitudinal grooves, axially closed on one end, are machined into the jacket face of the filter body; of these grooves, a first group begins at the upper end face of the filter body, remote from the injection opening, and a second group begins at a lower end face of the filter body, toward the injection opening. The longitudinal grooves of the first and second groups are disposed in alternating distribution over the circumference of the filter body. When there is a flow of fuel through the inflow conduit, the fuel at the filter body is forced to flow through the narrow gap between the profiled outer circumference of the filter body in the middle portion and the wall of the inflow conduit surrounding it, so that dirt particles, chips and the like beyond a certain size that have been entrained in the fuel are trapped.
These chips and particles collect at the closed, reduced-cross section lower end of the longitudinal grooves that begin at the upper end face remote from the injection opening. In the course of the delivery of fuel, which is at very high pressure, into the inflow conduit, the impetus force generated by this high pressure now acts on the particles collected in the closed end, which as a result over a certain period of time drive axial channels from the closed end of the longitudinal grooves into the wall of the lower collar, on the injection side, of the filter body or into the inflow conduit wall opposite this narrow gap. After a certain period of time in operation, these channels achieve orders of magnitude through which even larger chips and dirt particles can pass, and these chips and dirt particles then plug up the injection opening at the injection valve or block the mobile guidance of the valve member, which can cause total failure of the injection system.
ADVANTAGES OF THE INVENTION
The fuel injection valve of the invention for internal combustion engines, has the advantage over the prior art that by means of the axial enlargement of the lower collar, toward the injection opening, to pass the closed end of the longitudinal grooves that begin at the upper end face, this kind of channel formation can be prevented. By extending the narrow gap on the lower collar toward the wall of the inflow conduit into the region of the closed ends of the longitudinal grooves, retention pockets are formed in the lower, closed ends of the longitudinal grooves that begin at the upper end face. In this way, the high impetus force of the oncoming fuel, which has also built up at the circumferential faces of the middle portion that make it easier for fuel to pass over them, is not propagated as far as the lowermost closed end (groove bottom) of the longitudinal grooves, so that the abrasive action of the particles collected there can be reduced. In the retention pockets that collect the chips, static pressure fields develop, so that the particles are now hardly reached at all by the impetus energy of the oncoming fuel.
Furthermore, the dimension of the gap at the axially closed groove bottom toward the wall of the inflow conduit is now less, which once again helps to prevent the formation of channels.
Another advantage in terms of the effectiveness of the fuel filter used is attained by the conical form on the upper collar, remote from the injection opening, whose cross section decreases steadily toward the middle portion. By means of this
REFERENCES:
patent: 3908911 (1975-09-01), Hofmann et al.
patent: 4548356 (1985-10-01), Hofmann et al.
patent: 4627574 (1986-12-01), Hofmann et al.
patent: 4768719 (1988-09-01), Straubel et al.
patent: 5413281 (1995-05-01), Hofmann et al.
Boecking Friedrich
Hofmann Karl
Ganey Steven J.
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
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