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
  • 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
  • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
  • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
• • 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
  • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
  • F02M61/042—The valves being provided with fuel passages
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
  • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
• • 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
  • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
  • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type

Definitions

• Such a fuel fine spray valve has a valve needle arranged in a pressure chamber, which interacts with a valve seat for controlling a fuel flow to mostly a plurality of injection bores
• Injection bores in this case are arranged downstream of the valve seat in the flow direction and run in the housing of the fuel injection valve, wherein they have an inlet opening at the inflow end and an outlet opening at the outlet end.
• the inlet openings are formed in the wall of the pressure chamber, so that the fuel located in the pressure chamber can be injected through the injection holes in the combustion chamber of the internal combustion engine.
• the fuel injection valve according to the invention with the characteristic Merkma ⁇ len of claim 1 has the advantage over that an improved
• the inlet openings of the injection holes are arranged so that they overlap or at least touch.
• more injection bores can be accommodated than would be possible if the entrance openings with the usual web width between them originated directly from the wall of the blind hole.
• a blind hole is then formed on the valve seat, which has at least substantially the shape of a hemisphere.
• the blind hole may in this case directly adjoin the conical valve seat or be separated from it by a shoulder.
• the injection holes are arranged so that the diffusöffiionne overlap and thereby a Bohrungsver- cut is formed.
• FIG. 1 shows a longitudinal section through a fuel injection valve, wherein only the essential components are shown
• Figure 2 shows a first embodiment, wherein only the area of the valve seat is shown enlarged and additionally a plan view of the blind hole
• Figure 3 shows a further embodiment of Kraftstoff ⁇ injection valve according to the invention, in which the effective pitch circle diameter by a rounding of the webs between the injection holes erwei ⁇ tert,
• FIG. 4 shows a further exemplary embodiment in the form of a seat-hole nozzle, the valve needle being shown here
• 5 shows a further exemplary embodiment and an illustration of a method for producing such a fuel injection valve
• FIG. 6 shows, in a cross-section of the fuel injection valve, an arrangement of the injection bores with a bore intersection.
• FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention.
• the fuel injection valve has a housing 1 which comprises a valve body 3 and a holding body (not shown in the drawing).
• the individual parts of the housing 1 are pressed against each other by a clamping nut 9, so that enteteht a tight connection between the individual components.
• a pressure chamber 11 is formed which has the shape of a bore 12 in the region facing the combustion chamber, the bore 12 having a longitudinal axis 8.
• the pressure chamber 11 is delimited at its combustion-chamber-side end by a substantially conical valve seat 36, to which a blind hole 38 immediately adjoins, so that a transition edge 44 is formed between the blind hole 38 and the valve seat 36. From the blind hole 38 go several
• Injection holes 40, the finallysöffhungen 41 in the wall of Sack ⁇ hole 38 and ⁇ ustrittsöfrhungen their 42 are arranged on the outside of the housing 1 ange ⁇ .
• a piston-shaped valve needle 10 is arranged lekssver ⁇ pushed, which has a substantially conical valve sealing surface 34, with which it cooperates with the conical valve seat 36 and in this case the
• Fuel flow from the pressure chamber 11 controls in the blind hole 38, wherein the fuel between the valve needle 10 and the wall of the pressure chamber 11 is held vor ⁇ .
• valve needle 10 is guided in a middle section of the bore 12, where it is provided with polished sections 17 in this region, which allow a flow of fuel through the pressure chamber 11 in the direction of the valve seat 36 or the blind hole 38.
• a pressure shoulder 13 is formed, on which a pressure directed away from the valve seat 36 force is exerted on the valve needle 10.
• the spring chamber 14 can be filled with fuel under high pressure, wherein the pressure, due to the polished sections 17, continues through the entire pressure chamber 11 to the valve seat 36.
• a control chamber 20 is limited, which is filled with fuel and whose pressure is controlled by a control valve. Depending on the pressure in the control chamber results in a more or less large force on the valve seat facing away from the end face of the valve needle 10, which can be controlled via the control valve.
• the pressure chamber 11 there is a constant high pressure during operation of the internal combustion engine, which corresponds to the injection pressure. If the pressure in the control chamber 20 is lowered, then the valve needle 10, driven by the hydraulic force, moves away from the valve seat 36 on the pressure shoulder 13 and releases a cross section between the valve seat 36 and the valve sealing face 34, through the fuel from the pressure chamber 11 can flow to the injection holes 40. If the injection is to be ended, the pressure in the control chamber 20 is increased again, so that the valve needle 10 is pressed back into position against the valve seat 36 and interrupts the fuel flow to the injection openings 40
• FIG. 2 shows an enlargement of FIG. 1 in the area of the valve seat 36 together with a plan view along the line EI-II onto the blind hole 38.
• the valve needle 10 is not shown here for the sake of clarity.
• the blind hole 38 connects, the wall has substantially the shape of a truncated cone.
• From the blind hole 38 there are a plurality of star-shaped injection bores 40, each having an inlet opening 41 and an outlet opening 42, the outlet openings 42 being arranged on the outside of the fuel injection valve.
• the inlet openings 41 are arranged in the wall of the blind hole 38 so that they just touch.
• the valve needle 10 lifts off from the valve seat 36, fuel flows from the pressure chamber 11 between the valve sealing face 34 and the valve felt 36 into the blind hole 38, where the fuel flows through the Emtrittsöffhungen 41 in the injection holes 40 and finally injected through the öffausgangsöffhungen 42 into the combustion chamber. Since the inlet openings 42 are arranged with respect to the longitudinal axis of the bore 12 at the same height, they form a bolt circle having a pitch diameter D. In the plan view it is clear that due to the large number of injection holes 40, the webs between the individual Ein ⁇ injection bores 40th are very thin.
• the shape of the blind hole 38 can vary greatly and, for example, also be hemispherical in shape. Also, the blind hole 38, unlike shown in Figure 2, be formed substantially smaller in relation to the valve needle 10, which is particularly in so-called micro-
• FIG. 3 shows a further exemplary embodiment of a fuel injection valve according to the invention, wherein the same illustration as in FIG. 2 has been selected. Since the very thin webs between the injection holes 40 in the region of the blind hole are relatively unstable, they have been partially removed here by a rounding process, so that the effective pitch circle diameter D increases. The removed webs thus results in a recess in the blind hole 38, which increases the effective pitch circle diameter D.
• FIG 4 shows another embodiment in the same representation as Figure 3, in which the fuel injection valve is designed as a seat hole nozzle.
• the blind hole is omitted here and instead, the injection holes 40 go directly from the valve seat
• valve needle 10 upstream of the injection holes 40 touches on the valve seat 36.
• the injection holes 40 are in turn designed in number and size so that their ceramicsöffhungen 41 just touch, so ⁇ long the webs between the injection holes 40 are not removed.
• FIG. 4 the state after removal of the webs is in the region of the valve seat 36 shown, so that in the plan view, a very similar shape as in Figure 3 er ⁇ is.
• FIG. 5 shows a further exemplary embodiment of the fuel injection valve according to the invention, in which case the webs between the injection holes 40 have been removed by an erosion process.
• a recess is formed, which leads in a plane around the entire circumference of the locking hole 38, so that a large number of injection bores 40 can be accommodated in the resulting large pitch circle diameter.
• an electrical discharge method can be used, which is indicated in FIG. A correspondingly bent erosion tool 55 is moved in rotation, so that the recess is formed by material removal on the wall of the blind hole 38.
• Figure 6 shows in a cross section through a fuel injection valve at the level of
• blind hole 38 another way to arrange the injection holes 40.
• the inlet openings 41 of the injection bores 40 in this case almost completely overlap, so that a bore intersection is formed.
• a relatively large web width between the blind bores 46 a large number of outlet openings 42 can be accommodated, via which the fuel is ultimately injected into the combustion chamber becomes.
• the resulting Y-shaped bore intersection can be smoothed by employing a hydroerosive rounding method or other rounding method at the edges. As a result, the flow resistance is reduced when passing the fuel from the blind hole 38 in the injection holes 40, which increases the effective injection pressure.
• edges can be rounded by a similar method.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34966963

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (3)

Family Cites Families (5)

• 2004
  • 2004-07-09 DE DE102004033283A patent/DE102004033283A1/de not_active Withdrawn
• 2005
  • 2005-05-12 WO PCT/EP2005/052162 patent/WO2006005642A1/de active Application Filing
  • 2005-05-12 EP EP05740328.9A patent/EP1802863B1/de not_active Not-in-force
  • 2005-05-12 JP JP2007519748A patent/JP2008506059A/ja active Pending
  • 2005-05-12 CN CN2005800228977A patent/CN1981130B/zh not_active Expired - Fee Related

Patent Citations (3)

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