Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
  • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
  • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/02—Fuel-injection apparatus having means for reducing wear
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/27—Fuel-injection apparatus with filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/90—Selection of particular materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
  • F02M2547/001—Control chambers formed by movable sleeves

Definitions

• the invention relates to a fuel injector for injecting in a fuel storage under high pressure held fuel into the combustion chamber of an internal combustion engine according to the preamble of claim 1.
• a main channel leads from the injector to the injection nozzle, a second channel branches off at a suitable location from the main channel and leads to a servo valve, with which the control pressure of the control chamber is switched in the sense of opening and closing the nozzle needle.
• the fuel always contains particles up to a certain size. Therefore, in many known injectors on the input side filters or other construction elements are provided which retain particles above a harmful for the injector size.
• the control valves provided for controlling the injectors are intended to convert the supplied electrical control signal into a change of the control pressure as quickly as possible, the better the response of the valves, the better.
• An increase in the switching speed is achieved inter alia by a reduction in the stroke of the valve actuator, which of course means that particles that are larger than the hub, can not pass through the valve gap and pinch in the valve gap and thereby interfere with the function of the valve.
• the flow resistance increases with a correspondingly increasing deterioration of the hydraulic characteristics of the injector.
• WO 01/11222 A1 discloses a fuel injector for injecting fuel stored in a fuel reservoir under high pressure into the combustion chamber of an internal combustion engine, comprising an injector housing, a nozzle needle arranged to be longitudinally displaceable in the housing and an injection nozzle which can be optionally opened by the nozzle needle. by the fuel in the combustion chamber of the internal combustion engine can be injected bar contains.
• a control chamber which cooperates with the nozzle needle in the sense of an optional opening and closing of the injection nozzle and is acted upon by the fuel pressure, is delimited by a bush surrounding the nozzle needle, which is surrounded by the supplied fuel and releases an inlet channel leading to the control chamber. From EP 0957262 A2 and DE 100 37 388 Al each filter arranged in the inlet to the control chamber of a Kraftstoffinj are known per se.
• the object of the invention is to provide an improved fuel injector of the presumed kind.
• a fuel injector is to be created which rather, is largely insensitive to foreign body particles contained in the fuel supplied.
• the object is achieved by a fuel injector with the shopping ⁇ paint of claim 1.
• the invention provides a fuel injector for internal combustion engines, which has in a nozzle body an axial, flowed through by the fuel bore.
• the bore receives a nozzle needle in the axially displaceable guided nozzle needle, which has at its one end a seat in the nozzle body, and carries at its other end a seated on the circumference of the nozzle needle, relative to the nozzle needle displaceable sleeve.
• the sleeve is adjacent, resiliently supported on the nozzle needle, in abutment against an axially adjacent to the nozzle body component of Kraftstoffinj ector a control chamber from which is connected via an inlet channel in the socket with the fuel-flow space on the outside of the socket in conjunction, and the one Having controlled by a control valve drain channel.
• a filter is provided on the bushing for filtering the fuel flowing through the inlet channel to the control chamber.
• a significant advantage of the invention is that the control circuit is reliably protected from particles of very small size, while the flow in the main channel to the injection nozzle, which is significantly less sensitive to larger particles, remains substantially unimpaired.
• the filter is provided on the circumference of the bushing.
• the filter surrounding the circumference of the sleeve is annular.
• the filter is designed in the form of the lateral surface of a circular cylinder.
• the sleeve is formed with two sections with different circumferences and the filter is disposed on the smaller, recessed diameter of the bushing.
• the bushing in the region of a control-end-side section is retracted to the edge in relation to a section facing away from the control space, and the difference in diameter forms a radial step for the end-face contact of the filter.
• the recessed diameter forms a filter receiving recess in the form of a circumferential annular groove with two radial steps.
• a recess receiving the fuel flow passing through the filter is also formed on the bushing within the filter.
• the recess is formed in the form of a circumferential annular groove.
• the inlet channel leading to the control chamber contains an inflow throttle limiting the inflow.
• the inlet channel leading to the control chamber contains an antechamber collecting the inflow.
• the leading to the control chamber inlet channel is formed in the socket.
• the supply channel leading to the control chamber is formed in the shaft of the nozzle needle.
• the filter may be formed by a wire mesh filter or a wire mesh.
• the filter may be formed by a fabric laminate.
• the filter may be formed by a sintered material.
• the filter may be formed by a gap filter.
• the filter may be formed by a filter with holes, in particular circular, elliptical or polygonal holes.
• the filter is attached to the socket by welding.
• the filter is located in the Kraftstoffström injected and thus is self-cleaning.
• the fuel injector according to the invention will be explained with reference to the drawing.
• Figure 1 is a partial cross-sectional view of a fuel injector according to a first embodiment of the invention
• Figure 2 is a view of a detail A of Figure 1 and
• FIG. 3 shows a variant embodiment in a detail view corresponding to FIG. 2.
• FIG. 1 shows a part of a fuel injector which is provided for injecting fuel stored under high pressure in a fuel accumulator (common rail), not shown.
• the fuel injector comprises an injector housing, which is shown only partially, with a nozzle body 7, in which a nozzle needle 6 is arranged to be guided in a longitudinally displaceable manner. This is in cooperation with a provided at its one end seat in the nozzle body 7 an injector 13 for injecting the fuel optionally free.
• the fuel stored in the fuel reservoir under high pressure is supplied to the tip of the nozzle needle 6 in a ring-shaped surrounding nozzle leading chamber 14 via a in the form of an axially extending in the nozzle body 7 bore 8 high-pressure channel.
• the nozzle needle 6 is guided longitudinally displaceably in the axial bore 8.
• the nozzle needle 6 carries at its other end a seated on its periphery, relative to the nozzle needle 6 slidable bushing 1.
• the bushing 1 is resiliently on the nozzle needle 6 till- supports and abuts in plant against an axially adjacent to the Düsenkör ⁇ per 7 component of Kraftstoffinj injector from a control chamber 10 from which is connected via an inlet channel 2, 9 in the socket 1 with the fuel-flow space on the outside of the socket 1 in conjunction.
• control chamber 10 is acted upon by the fuel supplied at high pressure and selectively depressurized by means of a control valve not shown in the figure via an outlet throttle 4 in the sense of opening the injector 13.
• control chamber 10 is bounded circumferentially by the bush 1 surrounding the nozzle needle 6 and tightly against it, which is surrounded by the fuel supplied via the high-pressure bore 8 ,
• the bush 1 is the leading to the control chamber 10, an inlet throttle 2 containing inlet channel 2, 9 free.
• a filter 3 for filtering the fuel to be supplied to the control chamber 10 is provided, which is annularly formed surrounding the circumference of the bushing 1 and has the shape of the lateral surface of a circular cylinder.
• the outer periphery of the sleeve 1 is withdrawn to receive the filter 3.
• the recessed diameter 11 forms a circumferential annular groove in which the filter 3 is located between two radial stages of the groove.
• the withdrawn diameter 11 extends on a part of the sleeve to the upper end of the bushing 1, which has the mounting advantage that the filter 3 from above on the bushing 1 until it stops at a lower, formed by the diameter withdrawal, Radial stage can be pushed.
• the filter 3, preferably a wire mesh, can be formed separately from the socket 1 as a tissue cylinder.
• the bushing 1 is spot-welded circumferentially with the tissue cylinder.
• a recess which passes through the filter 3 and receives a fuel flow formed in the form of a circumferential annular groove 12 is provided.
• the inlet channel leading to the control chamber 10 contains the previously mentioned inflow restrictor 2 delimiting the inflow, and an antechamber 9 collecting the inflow at the transition from the groove 12 to the inflow throttle 2.
• the inflow throttle 2 opening into the control chamber is directed such that the mouth can not come to lie directly below the outlet throttle 4. Accordingly, the nozzle needle 6 is slightly withdrawn at the upper end in the scope.
• the leading to the control chamber 10 inlet channel 2, 9 is formed in the socket 1.
• the supply channel leading to the control chamber 10 may also be formed in the shaft of the nozzle needle 6.
• the socket 1 would have a corresponding, the access to the inlet channel releasing recess.
• the filter 3 may be formed by a cylindrical wire mesh or wire mesh having circumferentially and longitudinally extending wires.
• the longitudinal, ie, extending coaxially to the bushing wires are thicker to ensure sufficient strength. So that the wires can not move, the wire mesh should be sintered.
• the filter 3 may be formed by a fabric laminate or a sintered material.
• the filter 3 may be formed by a slit filter or a filter having holes, in particular circular, elliptical or polygonal holes.
• the filter 3 is self-cleaning. Due to the fuel flowing past in the high-pressure bore 8 on the outside of the filter 3 deposited particles are entrained there and in a manner not harmful to the fuel injector (and also for the internal combustion engine) by injection together with the fuel through the injector 13 into the combustion chamber of the internal combustion engine eliminated. Thus, a maintenance of the filter 3 is not required.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Manufacturing & Machinery (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (6)

Families Citing this family (15)

Family Cites Families (4)

• 2005
  • 2005-07-28 DE DE102005035347A patent/DE102005035347B3/de not_active Expired - Fee Related
• 2006
  • 2006-07-21 WO PCT/EP2006/007187 patent/WO2007012433A1/fr active Application Filing
  • 2006-07-21 AT AT06762739T patent/ATE426741T1/de active
  • 2006-07-21 DE DE502006003278T patent/DE502006003278D1/de active Active
  • 2006-07-21 KR KR1020087002774A patent/KR101029214B1/ko not_active IP Right Cessation
  • 2006-07-21 JP JP2008523192A patent/JP4869345B2/ja not_active Expired - Fee Related
  • 2006-07-21 EP EP06762739A patent/EP1907689B1/fr not_active Not-in-force

Non-Patent Citations (1)

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