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
  • F02M61/1866—Valve seats or member ends having multiple cones
• • 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
  • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
• • 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
  • F02M61/04—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
  • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
• • 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
  • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
• • 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
  • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

Definitions

• the invention relates to a fuel! injector, as it is used in particular as part of a common rail injection system for injecting fuel into the combustion chamber of a compression-ignition internal combustion engine.
• FIG. 2 of DE 102 42 685 A1 of the applicant An injector with the features of the preamble of claim 1 is known from FIG. 2 of DE 102 42 685 A1 of the applicant.
• the known fuel injector is characterized by a nozzle needle, the needle tip of which is two conical in the direction of a blind hole bottom of a nozzle body
• the fuel injector according to the invention with the features of claim 1 has the advantage that, in addition to a simplified manufacture of the nozzle needle Especially with small strokes or during the opening and closing of the nozzle needle, a cavitation tendency due to the formation of bubbles in the fuel is reduced to such an extent that no cavitation damage results in the area below the sealing seat in the area of the blind hole and especially not in the area of the injection openings. Furthermore, the fuel injector has the advantage that the nozzle needle is off-axis when it opens
• the invention is based on the idea that the described advantages can be achieved either by reducing the flow speed when opening the nozzle needle and thus the tendency to vortex formation with the resulting cavitation phenomena and / or that the flow of the fuel is better with small strokes of the nozzle needle is performed and / or that the fuel is subjected to less pronounced deflections and / or that a changed flow path of the fuel is realized.
• Claim 1 provides that the nozzle needle has a conical or conical shape from the area of the valve seat surface to an end face facing the blind hole
• the blind hole in the area of the sealing seat has a first section at a first angle to the longitudinal axis of the nozzle body, at which a second section extends in the direction of a blind hole bottom adjoins at a second angle, the second angle being smaller than the first angle with respect to the longitudinal axis.
• the bore is designed as a straight bore and is arranged at an oblique angle of the nozzle needle to the longitudinal axis.
• the arrangement optimizes the flow guidance of the fuel through the bore in that only slight deflections of the flow path for the fuel are realized. In addition, there is such a hole
• the oblique angle of the at least one bore corresponds to an oblique angle of the at least one
• Injection opening in the nozzle body is adapted or corresponds.
• the flow is not or only slightly deflected when flowing out of the bore in the direction of the at least one injection opening, which results in an optimization of the flow guidance and thus a reduction in the formation of eddies.
• the bore outlet of the at least one bore is arranged at the level of the injection opening or between the injection opening and the bottom of the blind hole when the nozzle needle is in the lowered position.
• the height offset between the bore outlet of the at least one bore and the at least one injection opening, viewed in the direction of the longitudinal axis of the nozzle needle, is minimized when the nozzle needle is opened.
• Nozzle body provides that the nozzle needle rotatably with respect to their
• Longitudinal axis is aligned so that the fuel flows almost directly is made possible from the area of the nozzle needle into the area of the injection opening.
• the bore outlet of the at least one bore opens in the area of the end face of the needle tip facing the blind hole base.
• Such a configuration or arrangement of the at least one bore can possibly be implemented even more easily from a manufacturing point of view than the proposals made above, in which the bore outlet is located on one
• the bore outlet is located in the area of the end face of the needle tip facing the blind hole base, provides that the at least one bore has a plurality of bore sections, one of which is the end face of the needle tip
• such a bore section can be on the side of the needle tip facing away from the end face in a transverse bore that runs perpendicular to the longitudinal axis and traverses the nozzle needle as the second
• the first bore section is connected on the side facing away from the end face of the needle tip with at least one bore arranged at an oblique angle to the longitudinal axis, which is in the
• Valve sealing surface opens.
• the end face of the needle tip when the nozzle needle is partially open in which the ratio of the annular flow cross-section between the nozzle needle and the nozzle body is less than 1.5 times the total area of the cross-sectional areas of the injection openings, on the side facing the blind hole base is arranged upper injection opening edge of the injection opening.
• a further embodiment of the invention proposes that the bore inlet of the at least one bore with the sealing seat formed in the transition area between the seat surface arranged at different angles and the one facing it in the direction of
• Blind hole bottom adjoining section of the nozzle body is arranged.
• the diameter of the at least one bore in the nozzle needle is smaller than or equal to the diameter of the at least one injection opening.
• FIG. 5 the fuel! injector according to FIG. 3 with a partially raised
• the fuel injector 10 has a nozzle body 12, in the wall of which at least one, preferably several, injection openings 14 are formed. Via the at least one injection opening 14, from one
• High pressure chamber 16 of the nozzle body 12 are injected under high pressure fuel into the combustion chamber of the internal combustion engine.
• Injection opening 14 extends at an oblique angle a to a longitudinal axis 18 of the nozzle body 12.
• the nozzle body 12 also has a recess 20 to form the high-pressure chamber 16, which is on the
• the injection opening 14 extends, for example, from the area of the section
• the nozzle body 12 interacts with a nozzle needle 25 arranged so as to be liftable in the direction of the longitudinal axis 18 and concentric to the longitudinal axis 18.
• Magnetic actuator, nozzle needle 25 moved in a manner known per se, is shown in the figures in a lowered position forming a sealing seat 26 with the nozzle body 12 in the area of the seat surface 21.
• the at least one injection opening 14 is closed at least indirectly, so that no fuel reaches the area of the injection opening 14 from the area of the high-pressure chamber 16.
• the nozzle needle 25 has a needle tip 28 which has a conical or frustoconical or conical in longitudinal section valve seat surface 29 with an angle g / 2 to the longitudinal axis 18 which corresponds to the angle ßi the Seat surface 21 of the nozzle body 12 is adapted or corresponds to this.
• the needle tip 28 has a flat end face 30 on the side facing the blind hole base 23.
• At least one straight bore 34 is formed in the nozzle needle 25, which is arranged at an inclined angle D with respect to the longitudinal axis 18, the angle D preferably being adapted to or corresponding to the angle a of the injection opening 14.
• the diameter of the at least one bore 34 is at most as large as the diameter of the injection opening 14.
• the bore 34 has a bore inlet 36 which, when the nozzle needle 25 is lowered, is arranged in the transition region between the seat surface 21 and the section 22 of the nozzle body 12.
• a longitudinal axis 38 of the bore 34 preferably intersects the transition between the seat surface 21 and the section 22.
• a bore outlet 40 of the bore 34 opens in the illustrated embodiment at approximately the height of the
• the nozzle needle 25 is arranged in a rotationally fixed manner in relation to the longitudinal axis 18, the bore outlet 40 of the bore 34 with the mouth of the injection opening 14 in the area of the
• the nozzle body 12 is aligned with respect to the angular position about the longitudinal axis 18.
• a nozzle needle 25a is shown in which the straight bore 34a opens with its bore outlet 40 in the area of the end face 30 of the nozzle needle 25a.
• the bore inlet 36 is arranged in relation to the nozzle body 12 with the nozzle needle 25a lowered, corresponding to the nozzle needle 25.
• FIG 3 shows a nozzle needle 25b, in which the bore 34b has a first bore section 41 which runs concentrically to the longitudinal axis 18 and opens in the area of the end face 30 of the needle tip 28.
• the first bore section 41 On the side of the first bore section 41 facing away from the end face 30, the latter opens into (At least) two bores 42, 43, each arranged at an inclined angle to the longitudinal axis 18, which form second bore sections 45.
• the bore inlets 36 are arranged in relation to the nozzle body 12 with the nozzle needle 25b lowered, corresponding to the nozzle needle 25 and 25a.
• FIG. 4 shows a nozzle needle 25c which differs from the nozzle needle 25b in that the bore 34c is also the first
• FIG. 5 shows the fuel injector according to FIG. 3 with the nozzle needle 25b lifted from the sealing seat 26 but not completely lifted.
• an area ratio between a seat area Asi tz in the area of an annular inlet gap 50 between the nozzle needle 25b and the nozzle body 12 and the total cross-sectional areas Asi of the injection opening (s) 14 is less than 1.5, i.e. Asi tz ⁇ 1 , 5c Asi.
• the end face 30 of the nozzle needle 25b is located on the side of an upper inlet edge 51 of the at least one injection opening 14 facing the blind hole base 23.
• the injector 10 can be altered or modified in a wide variety of ways without deviating from the inventive concept.
• the geometry of the recess 20 in the area of the blind hole 19 can be designed differently. Also can
• Bore inlet 36 can be arranged just below or above the transition from the seat surface 21 to the section 22.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=71575379

Family Applications (1)

Country Status (5)

Family Cites Families (10)

• 2019
  • 2019-07-17 DE DE102019210551.3A patent/DE102019210551A1/de active Pending
• 2020
  • 2020-07-08 WO PCT/EP2020/069222 patent/WO2021008961A1/de unknown
  • 2020-07-08 EP EP20739328.1A patent/EP3999735A1/de active Pending
  • 2020-07-08 US US17/627,955 patent/US20220298999A1/en active Pending
  • 2020-07-08 CN CN202080064995.1A patent/CN114402134B/zh active Active

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