EP2920452B1 - Injecteur - Google Patents

Injecteur Download PDF

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Publication number
EP2920452B1
EP2920452B1 EP13788759.2A EP13788759A EP2920452B1 EP 2920452 B1 EP2920452 B1 EP 2920452B1 EP 13788759 A EP13788759 A EP 13788759A EP 2920452 B1 EP2920452 B1 EP 2920452B1
Authority
EP
European Patent Office
Prior art keywords
injector
bore
leakage
nozzle needle
control piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13788759.2A
Other languages
German (de)
English (en)
Other versions
EP2920452A1 (fr
Inventor
Roman Etlender
Willibald SCHÜRZ
Werner Reim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2920452A1 publication Critical patent/EP2920452A1/fr
Application granted granted Critical
Publication of EP2920452B1 publication Critical patent/EP2920452B1/fr
Active legal-status Critical Current
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
    • 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 an injector with an injector, an actuator and a nozzle needle, wherein the actuator is disposed in an actuator chamber of the injector, wherein the injector comprises a control piston bore, in which a control piston is arranged, wherein a leakage pin hole between the actuator chamber and the control piston bore provided is, in which a leakage pin is arranged, which couples the control piston to the actuator, wherein the control piston is in hydraulic operative connection for opening or closing an outlet opening of the injector with the nozzle needle, wherein a high pressure line is provided, which is used to transport a pressurized fuel is designed for the nozzle needle.
  • injectors for injecting fuel in a combustion chamber of a combustion chamber which include an injector housing a piezoelectric actuator and a nozzle needle.
  • the piezoelectric actuator is arranged in an actuator chamber of the injector housing.
  • the injector housing comprises a control piston bore, in which a control piston is arranged.
  • a leakage pin bore is provided, in which a leakage pin is arranged, which couples the control piston with the piezoelectric actuator.
  • a high pressure line is provided, which is designed for transporting a pressurized fuel to the nozzle needle.
  • this injector requires a precisely matched clearance between the pin hole and the leakage pin, which is expensive to manufacture.
  • this fit continues to be adapted to a clearance between the control piston and the control piston bore, so that the function for actuating the nozzle needle is ensured.
  • the coupler device comprises a coupler piston which is axially adjustably mounted in a guide piece and has a piston portion of smaller diameter, which is guided through a guide portion of the guide piece and supported on the piezoactuator.
  • the piezoelectric actuator is arranged in a low-pressure region and arranged to ensure the tightness of the sealing gaps between the piston portion and the guide piece.
  • a bore is arranged for hydraulic connection of the sealing gaps with a pressurized space under system pressure in the guide piece and the guide piece is arranged wholly or partly in a pressurized space under system pressure.
  • an improved injector can be provided by the injector comprising an injector housing, an actuator and a nozzle needle.
  • the actuator is arranged in an actuator space of the injector housing.
  • the injector housing comprises a control piston bore, in which a control piston is arranged, wherein a leakage pin bore between the actuator chamber and the control piston bore is provided, in which a leakage pin is arranged, which couples the control piston with the actuator.
  • the control piston is in hydraulic operative connection for opening or closing an outlet opening of the injector housing with the nozzle needle.
  • a high-pressure line is provided, which is designed for transporting a pressurized fuel to the nozzle needle.
  • a supply line is provided in the injector housing, which connects the leakage pin bore with the high pressure line.
  • This embodiment has the advantage that the settings of the tolerances of the mating clearance between the leakage pin and the leakage pin bore and the control piston to the control piston bore are functionally separated from each other and no longer dependent on each other must be coordinated. As a result, the production of the injector can be simplified. Further, narrower clearance for both the leakage pin and the leakage pin bore as well as the spool and spool bore may be selected to increase the stiffness of the injector and thus reduce dead time of the injector. Furthermore, a higher robustness over the life of the injector is made possible because a worn leakage pin or a worn leakage pin bore has essentially no further effects on the operating behavior of the injector.
  • a particularly good operating behavior and a particularly low leakage, and thus a particularly energy-efficient injector is provided by the throttle forming a first cross-sectional area and the leakage pin and the leakage pin bore forming a second cross-sectional area in a plane transverse to a longitudinal axis of the injector, the first cross-sectional area being the same Has size as the second cross-sectional area.
  • the control piston forms a first control chamber together with the control piston bore on a first end side facing the leakage pin, wherein a second control chamber is provided on the front side of the nozzle needle, the first control chamber being connected to the second control chamber via a connection bore Control stroke movement of the nozzle needle.
  • a first control chamber can be limited by the fact that a nozzle needle sleeve is provided, wherein the nozzle needle sleeve and the nozzle needle form a first guide game, through which a first fuel leakage flow is able to pass to the second control chamber.
  • control piston and the control piston bore form a piston clearance through which a second fuel leakage flow is able to pass into the first control space, wherein a second guide clearance is provided between the leakage pin and the leakage pin bore through which a third fuel leakage flow is to pass into the actuator space can.
  • the supply line can be easily manufactured if an intermediate plate between the actuator chamber and the control piston bore is provided, in which the supply line and the leakage pin hole are arranged.
  • the intermediate plate comprises at least a first and a second intermediate plate part, wherein the feed line is groove-shaped in at least the first intermediate plate part and is closed by the second intermediate plate part.
  • the supply line can be easily introduced, for example by means of a milling process in the intermediate plate or in the injector.
  • Particularly short processing time for producing the supply line is required when the supply line is arranged substantially perpendicular to the high-pressure line and / or the leakage pin hole.
  • the supply line is arranged substantially obliquely to the high-pressure line and / or the leakage pin hole, wherein the supply line opens into an upper or lower region of the high-pressure line.
  • the supply line can be introduced, for example, in a simple manner by means of a drilling operation in the intermediate plate.
  • the actuator is designed as a piezoelectric actuator. In this way, a particularly fast reaction time and a high actuation pressure for actuating the leakage pen can be provided.
  • the injector 10 can be used for injecting fuel, in particular of a diesel fuel, into an internal combustion engine that includes a common rail injection system.
  • the injector 10 has an injector housing 15.
  • the injector housing 15 comprises a high-pressure line 25 extending parallel to a longitudinal axis 20, which can be supplied with high-pressure fuel via a high pressure port 30.
  • the high-pressure port 30 is arranged in an upper region 11.
  • a leakage connection 40 for returning fuel to a fuel tank of the motor vehicle is provided in the upper region 11 of the injector housing 15.
  • the injector 15 in the upper portion 11 of the injector 10 has an actuator chamber 45 in which a piezoelectric actuator 50 is arranged.
  • a piezoelectric actuator 50 As an alternative to the piezoelectric actuator 50, a magnetostrictive actuator could also be arranged in the actuator chamber 45.
  • the actuator chamber 45 further has a leakage connection 51 to the leakage connection 40 and is thus part of a low pressure region 52 of the injector 10.
  • the piezoelectric actuator 50 is preferably designed as a fully active piezo stack and has approximately a cylindrical shape and is connected via an electrical connection 54 with a supplied electrical voltage to change a length of the piezoelectric actuator 50 in the longitudinal direction, ie in the direction of the longitudinal axis 20.
  • the injector 10 In an in FIG. 1 Below the upper portion 11 arranged lower portion 55 of the injector 15, the injector 10 has a control piston bore 60 in which a control piston 65 is arranged.
  • the control piston 65 has a first end face 70, which faces the piezoelectric actuator 50.
  • the first end face 70 forms together with the control piston bore 60 from a first control chamber 75.
  • the control piston 65 forms a spring chamber 80 with a second end face 95 in the control piston bore 60.
  • the control piston 65 is arranged to be movable between the first control chamber 75 and the spring chamber 80 in the direction of the longitudinal axis 20.
  • a control piston spring 85 is provided, which is formed for example as a spiral compression spring.
  • a first longitudinal end 90 of the control piston spring 85 of the second end face 95 of the control piston 65 faces and is supported on this.
  • a second longitudinal end 100 of the control piston spring 85 is supported on a lower end face 104, which faces the second end face 95 of the control piston 65, the control piston bore 60 from.
  • the control piston spring 85 acts on the control piston 65 with a force acting in the direction of the first control chamber 75 parallel to the longitudinal axis 20 force. It is emphasized that in the FIGS. 1 and 2 Although shown control piston 65 is different, but is functionally identical.
  • a leakage pin bore 105 is arranged between the actuator chamber 45 and the first control chamber 75 of the control piston bore 60.
  • a leakage pin 110 is further arranged, which rests against a third end face 115 on the piezoelectric actuator 50 and with a fourth end face 120 of the leakage pin 110 on the first end face 70 of the control piston 65.
  • the length of the leakage pin 110 or of the leakage pin bore 105 is selected such that, given an increase in the length of the piezoactuator 50 in the direction of the longitudinal axis 20, the change in length of the piezoactuator 50 is transmitted to the control piston 65 via the leakage pin 110.
  • the leakage pin 110 further includes an axial movement of the leakage pin 110 in FIG allow the leakage pin bore 105, a first guide play 121, which is designed as a clearance fit.
  • the leakage pin bore 105 is arranged in an intermediate plate 125.
  • the intermediate plate 125 abuts against a control plate 130, in which the control piston bore 60 is arranged.
  • the high-pressure line 25 extends through the connection plate 135, the control plate 130 and the intermediate plate 125.
  • nozzle needle housing 140 below this, on the connection plate 135, there is a nozzle needle housing 140, in which the high-pressure line 25 ends.
  • a nozzle needle bore 145 is further provided, which extends along the longitudinal axis 20 and in which a nozzle needle sleeve 150 is arranged.
  • the spring chamber 80 is connected via a spring chamber bore 146 with the nozzle needle bore 145.
  • the nozzle needle sleeve 150 peripherally surrounds a nozzle needle 155.
  • the nozzle needle 155 has an upper end face 160 on the upper side, which faces the connection plate 135.
  • the upper end face 160 forms, together with the connection plate 135 in the longitudinal direction 20 and in the radial direction with respect to the longitudinal axis 20, together with the nozzle needle sleeve 150, a second control chamber 160.
  • the second control chamber 160 is connected via a schematically illustrated first connecting bore 165 with the first control chamber 75.
  • a collar 170 is provided on the nozzle needle 155, which is formed substantially perpendicular to the longitudinal axis 20 circumferentially around the nozzle needle 155.
  • a first longitudinal end 180 of the nozzle spring 175 is supported on the nozzle needle sleeve 150 and a second, opposite the longitudinal end 180 arranged longitudinal end 185 of the nozzle spring 175 via a ring 186 on the collar 170 from.
  • the nozzle spring 175 acts on the nozzle needle 155 with a parallel to the longitudinal axis 20 acting away from the second control chamber 160 Force.
  • the nozzle needle 155 further has a nozzle tip 190 on a longitudinal side facing away from the upper end face 160. Further, in the area of the nozzle tip 190, an outlet opening 195 is provided, which is closed by the nozzle needle tip 190.
  • the high-pressure line 25 can be filled with a fuel which is under high pressure (1000 to 3000 bar), for example from a rail of a common-rail injection system, and is thus part of a high-pressure region 200 of the injector 10.
  • the fuel is directed to the nozzle needle bore via the high-pressure line 25 145 promoted.
  • the nozzle needle sleeve 150 and the nozzle needle 155 have a second guide clearance 205. Through the second guide clearance 205, the pressurized fuel from the nozzle needle bore 145 penetrates into the second control chamber 160 with a first fuel leakage flow K 1 . Via the first connection bore 165, the first fuel leakage flow K 1 is forwarded to the first control chamber 75.
  • the spring chamber 80 is connected via a second connecting bore 210 with the nozzle needle bore 145, so that in the spring chamber 80, the fuel is under high pressure and presses against the second end face 76 of the control piston 65.
  • the control piston 65 has an axial movement of the control piston 65 in the control piston bore 60 a piston clearance 215, through which a second fuel leakage flow K 2 flows in the direction of the first control chamber 75, in which the second fuel leakage flow K 2 combines with the first fuel leakage flow K 1 ,
  • the fuel leakage flows occur only when the pressure in the first control chamber 75 is smaller than the pressure in the high-pressure line 25.
  • the leakage pin 110 If the leakage pin 110 is displaced downward by an increase in length of the piezoelectric actuator 50 in the direction of the nozzle needle 155, it actuates the control piston 65 and also presses the control piston 65 in the direction of the nozzle needle 155. As a result, the volume of the first control chamber 75 is increased, as a result of which Pressure is reduced, with the pressure equalization fuel off the second control chamber 160 flows via the first connecting bore 165 and thus drops in the second control chamber 160 of the prevailing pressure there. Further, the first and the second fuel leakage flow K 1 , K 2 flow into the first control chamber 75.
  • the pressure drop in the second control chamber 160 decreases a force for pressing the nozzle needle 155 against the outlet opening 166, so that the nozzle needle 155 by the in the nozzle needle bore 145 prevailing pressure is raised on the underside in the area of the nozzle needle tip 190 and the nozzle needle spring 175 is compressed.
  • fuel flows from the nozzle needle bore 145 via the outlet opening 195 into a combustion chamber of an internal combustion engine.
  • the piezoelectric actuator 50 is electrically controlled in such a way that it shortens back to its original state.
  • the control piston spring 85 presses the control piston 65 in the direction of the actuator chamber 45, wherein the leakage pin 110 is also pressed in the direction of the actuator chamber 45.
  • the leakage pin 110 follows the axial shortening of the piezoelectric actuator 50. In this case, the volume of the first control chamber 75 is reduced and the fuel contained therein is pressed via the first connection bore 165 into the second control chamber 160. Furthermore, part of the fuel flows via a third fuel leakage flow K 3 into the actuator chamber 45.
  • the increase in pressure causes the pressure through the fuel in the second control chamber 160 and the force of the nozzle needle spring 175 to be greater than that of the pressurized fuel in the nozzle needle bore 145 to lift the nozzle needle 155 so that the nozzle needle 155 returns downward is pressed so that the nozzle needle tip 190 closes the outlet opening 166 in the injector 15.
  • a supply pipe 225 is provided between the leakage pin hole 105 and the high-pressure pipe 75 in the intermediate plate 125.
  • the supply line 225 is in the FIGS. 3 and 4 arranged obliquely to the longitudinal axis 20 and the leakage pin 110 and terminates in an upper region of the high-pressure line 25.
  • the supply line 225 may also be arranged transversely to the longitudinal axis 20 or end in a lower region of the high-pressure line 25.
  • the oblique arrangement of the feed line 225 has the advantage that the feed line 225 can be introduced by an obliquely attached drill through the already introduced into the intermediate plate 125 leakage pin bore 105 or the high pressure line 25 to connect the high pressure line 25 with the leakage pin hole 105.
  • the high pressure line 25 supplies the supply line 225 with fuel under high pressure. This fuel sets the fuel in the first guide clearance 121 under the pressure of the high-pressure line 25. This causes the pressure difference at the leakage pin 110 between the high-pressure area 200 and the low-pressure area 52 of the injector 10 to be eliminated. As a result, the low-pressure region 52 is functionally separated from the function of the high-pressure region 200.
  • the first and second guide play 121 and 205 as well as the piston play 215 can be designed for minimally possible play for this state of the injector 10 in order to prevent jamming. Furthermore, it can be avoided that the first and second guide play 121 and 205 and the piston play 215 are to be adapted to a minimum leakage flow with respect to one each by the first and second guide play 121 and 205 and piston play 215. As a result, the design of the injector 10 can be simplified.
  • FIG. 4 shows a section A of in FIG. 1 shown injector according to a second embodiment.
  • the injector 230 is substantially identical to that in FIG FIG. 3 formed injector.
  • a throttle 235 is provided in the supply line 225, which is disposed adjacent to the leakage pin bore 110. It has also proven to be advantageous if the throttle is arranged at a distance of up to 20 percent of the length of the supply line from the leakage pin bore 105.
  • the throttle 235 has a first cross-sectional area.
  • the first guide play 121 is selected to ensure a movement of the leakage pin 110 as a clearance fit. As a result, there is a gap between the leakage pin 110 and the leakage pin bore 105.
  • the gap forms an annular surface with a second cross-sectional area.
  • the first cross-sectional area is approximately the same size as the second cross-sectional area.
  • the functional robustness of the injector against possible wear on the leakage pin 110 is minimized by the fact that the first guide clearance 121 can be optimally adapted to the loads of the leakage pin 110 in the leakage pin bore 105.
  • the first guide play 121 can be selected such that during the up-and-down movement of the fuel located in the second guide play 121 for lubrication does not break off and thus the direct rubbing of the leakage pin 110 can be avoided at the leakage pin bore 105 and at the same time the third Fuel leakage current K 3 to the actuator chamber 45 is minimized.
  • FIG. 5 shows a section of the one in the FIGS. 1 to 4 shown injector 240 according to a third embodiment.
  • the injector 240 is substantially identical to that in the FIGS. 1 to 4 formed injector.
  • the intermediate plate 125 in addition to that in the FIGS. 1 to 4
  • the first intermediate plate part 245 is arranged adjacent to the actuator space 45, while the second intermediate plate part 250 rests against the control plate 130.
  • a feed line 260 is provided on the end face 255 facing the second intermediate plate part 250, which feed line is formed in a groove shape in the first intermediate plate part 245.
  • the supply line 260 extends radially from the leakage pin 110 outwardly to the high pressure line 25 and connects the leakage pin hole 105 with the high pressure line 25.
  • the groove-like configuration of the feed line 260 has the advantage that they easily, for example, with a milling operation, in the first intermediate plate part 245th can be introduced.
  • the feed line 260 is through the second intermediate plate part 250th closed at the bottom so that the two intermediate plate parts 245, 250 form a channel which connects the leakage pin bore 105 with the high pressure line 25.
  • the feed line 260 may have a rectangular, polygonal, round or trapezoidal cross-section, depending on the desired design.
  • the feed line 260 is disposed in the upper intermediate plate portion 245.
  • the feed line 260 can also be arranged in the lower second intermediate plate part 250 or in both intermediate plate parts 245, 250.
  • the supply line 260 may also consist of several juxtaposed Zulite effet für wet.
  • FIG. 6 shows a section of the in FIG. 1 shown injector according to a fourth embodiment.
  • the injector 265 is substantially identical to the in FIG. 5 formed injector.
  • a throttle 265 is provided in the supply line 260, which is arranged adjacent to the leakage pin bore 105.
  • the throttle 265 is similar in terms of their dimensions as in FIG. 4 explained throttle formed.
  • the throttle 265, as also explained above, spaced from the leakage pin bore 105 are arranged. In this way, the fuel leakage current K 3 can be minimized particularly well in the dynamic operation of the injector 265. Further, as explained above, the wear of the leakage pin 110 in the leakage pin bore 105 can be minimized.
  • the above-mentioned embodiments of the injector 10, 230, 240, 265 also have the advantage that the second guide play 205 or the piston play 215 can be selected independently of the first guide play 121 between the leakage pin 110 and the leakage pin bore 105.
  • the guide plays 121, 205 and the piston play 215 can each be adapted optimally to the respective task of the component, for example control piston 65 or the nozzle needle sleeve 150.
  • second guide play 205 and / or the piston clearance 215 is significantly reduced compared to the injectors known in the art, so that the rigidity of the control piston 65 is increased in the control piston bore 60 and at the same time a dead time of the injector is reduced.
  • the robustness of the injector 10, 230, 240, 265 is increased, so that the injector 10, 230, 240, 265 has a longer service life, since the wear on the leakage pen 111 has almost no effect on the behavior of the control piston 65 or the control of the Nozzle needle 155 has.
  • the leakage within the injector 10, 230, 240, 265 is reduced by the closely selected guide plays 205, 121 and / or the reduced piston play 210.

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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)
  • Fuel-Injection Apparatus (AREA)

Claims (10)

  1. Injecteur (10 ; 230 ; 240 ; 265) comprenant un boîtier d'injecteur (15), un actionneur (50) et un pointeau de buse (155),
    - l'actionneur (50) étant disposé dans un espace d'actionneur (45) du boîtier d'injecteur (15),
    - le boîtier d'injecteur (15) comprenant un alésage de piston de commande (60) dans lequel est disposé un piston de commande (65),
    - un alésage de goupille de fuite (105) étant prévu entre l'espace d'actionneur (45) et l'alésage de piston de commande (60), dans lequel est disposée une goupille de fuite (110), laquelle accouple le piston de commande (65) à l'actionneur (50),
    - le piston de commande (65) étant en liaison fonctionnelle hydraulique pour l'ouverture ou la fermeture d'une ouverture de sortie (195) du boîtier d'injecteur (15) au moyen du pointeau de buse (155),
    - une conduite haute pression (25) étant prévue, laquelle est conçue pour transporter un carburant sous pression jusqu'au pointeau de buse (155),
    - une conduite d'alimentation (225 ; 260) étant prévue dans le boîtier d'injecteur (15), laquelle relie l'alésage de goupille de fuite (105) à la conduite haute pression (25),
    caractérisé en ce que
    - dans la conduite d'alimentation (225 ; 260) est prévu un étranglement (235, 265),
    - l'étranglement présente une première surface en section transversale, et une fente entre la goupille de fuite (110) et l'alésage de goupille de fuite (105), dans un plan transversal à un axe longitudinal (20) de l'injecteur (10 ; 230 ; 240 ; 265), présente une surface annulaire avec une deuxième surface en section transversale, la première surface en section transversale présentant la même taille que la deuxième surface en section transversale.
  2. Injecteur (10 ; 230 ; 240 ; 265) selon la revendication 1, caractérisé en ce que
    - le piston de commande (65) constitue, au niveau d'un premier côté frontal (70) tourné vers la goupille de fuite (110), conjointement avec l'alésage de piston de commande (60), un premier espace de commande (75),
    - un deuxième espace de commande (160) étant prévu du côté frontal au niveau du pointeau de buse (155),
    - le premier espace de commande (75) étant en liaison avec le deuxième espace de commande (160) par le biais d'un alésage de liaison (165) afin de commander un mouvement de course du pointeau de buse (155).
  3. Injecteur (10 ; 230 ; 240 ; 265) selon la revendication 1 ou 2, caractérisé en ce qu'une douille de pointeau de buse (150) est prévue, la douille de pointeau de buse (150) et le pointeau de buse (155) constituant un premier jeu de guidage (205) par le biais duquel un premier flux de fuite de carburant (K1) peut passer jusqu'au deuxième espace de commande (160).
  4. Injecteur (10 ; 230 ; 240 ; 265) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le piston de commande (65) et l'alésage de piston de commande (60) constituent un jeu de piston (210) par le biais duquel un deuxième flux de fuite de carburant (K2) peut passer jusqu'au premier espace de commande (75), un deuxième jeu de guidage (121) étant prévu entre la goupille de fuite (110) et l'alésage de goupille de fuite (105), par le biais duquel un troisième flux de fuite de carburant (K3) peut passer jusqu'à l'espace d'actionneur.
  5. Injecteur (10 ; 230 ; 240 ; 265) selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'entre l'espace d'actionneur (45) et l'alésage de piston de commande (60) est prévue une plaque intermédiaire (125) dans laquelle sont disposés la conduite d'alimentation (225 ; 260) et l'alésage de goupille de fuite (105).
  6. Injecteur (10 ; 230 ; 240 ; 265) selon la revendication 5, caractérisé en ce que la plaque intermédiaire (125) comprend au moins une première et une deuxième partie de plaque intermédiaire (245, 250), la conduite d'alimentation (225 ; 260) étant disposée en forme de rainure dans au moins la première partie de plaque intermédiaire (245) et étant fermée par la deuxième partie de plaque intermédiaire (250).
  7. Injecteur (10 ; 230 ; 240 ; 265) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la conduite d'alimentation (225 ; 260) est disposée essentiellement perpendiculairement à la conduite haute pression (25) et/ou à l'alésage de goupille de fuite (105).
  8. Injecteur (10 ; 230 ; 240 ; 265) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la conduite d'alimentation (225 ; 260) est disposée essentiellement obliquement par rapport à la conduite haute pression (25) et/ou à l'alésage de goupille de fuite (105), la conduite d'alimentation (225 ; 260) débouchant dans une région supérieure ou inférieure de la conduite haute pression (25).
  9. Injecteur (10 ; 230 ; 240 ; 265) selon la revendication 8, caractérisé en ce que l'étranglement (235, 265) est disposé en position adjacente à l'alésage de goupille de fuite (105) dans la conduite d'alimentation (225 ; 260).
  10. Injecteur (10 ; 230 ; 240 ; 265) selon l'une quelconque des revendications 1 à 9, caractérisé en ce que l'actionneur (50) est réalisé sous forme d'actionneur piézo-électrique (50).
EP13788759.2A 2012-11-13 2013-11-07 Injecteur Active EP2920452B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012220610.8A DE102012220610B4 (de) 2012-11-13 2012-11-13 Injektor
PCT/EP2013/073297 WO2014075988A1 (fr) 2012-11-13 2013-11-07 Injecteur

Publications (2)

Publication Number Publication Date
EP2920452A1 EP2920452A1 (fr) 2015-09-23
EP2920452B1 true EP2920452B1 (fr) 2017-06-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13788759.2A Active EP2920452B1 (fr) 2012-11-13 2013-11-07 Injecteur

Country Status (6)

Country Link
US (1) US10662913B2 (fr)
EP (1) EP2920452B1 (fr)
CN (1) CN104838129B (fr)
DE (1) DE102012220610B4 (fr)
IN (1) IN2015DN02087A (fr)
WO (1) WO2014075988A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012220610B4 (de) 2012-11-13 2015-04-02 Continental Automotive Gmbh Injektor
GB2573522B (en) * 2018-05-08 2020-08-19 Delphi Tech Ip Ltd Method of identifying faults in the operation of hydraulic fuel injectors having accelerometers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009002554A1 (de) * 2008-07-23 2010-01-28 Robert Bosch Gmbh Kraftstoffinjektor für ein Kraftstoffeinspritzsystem

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DE19605277B4 (de) * 1995-02-15 2004-06-03 Nippon Soken, Inc., Nishio Magnetbetätigtes hydraulisches Steuerventil zur Verwendung im Kraftstoffeinspritzsystem eines Verbrennungsmotors
JP2001140726A (ja) * 1998-12-09 2001-05-22 Denso Corp 弁装置およびそれを用いた燃料噴射装置
JP4048699B2 (ja) * 1999-11-10 2008-02-20 株式会社デンソー 燃料噴射弁
ITBO20030678A1 (it) 2003-11-14 2005-05-15 Magneti Marelli Powertrain Spa Iniettore di carburante con attuazione idraulica dello spillo
DE102004017303A1 (de) * 2004-04-08 2005-10-27 Robert Bosch Gmbh Einspritzdüse
RU2438035C2 (ru) 2006-03-03 2011-12-27 Ганзер-Хюдромаг Аг Инжекторный клапан для топлива для двигателя внутреннего сгорания (варианты)
JP4683035B2 (ja) 2007-11-13 2011-05-11 株式会社デンソー インジェクタ
DE102008032133B4 (de) 2008-07-08 2015-08-20 Continental Automotive Gmbh Kraftstoffeinspritzvorrichtung
JP5263135B2 (ja) 2009-12-08 2013-08-14 株式会社デンソー 燃料噴射弁
DE102010021169B4 (de) 2010-05-21 2012-03-08 Continental Automotive Gmbh Verfahren und Vorrichtung zur Ermittlung des tatsächlichen Einspritzbeginns eines Piezo-Kraftstoff-Einspritzventils
US8448878B2 (en) * 2010-11-08 2013-05-28 Caterpillar Inc. Fuel injector with needle control system that includes F, A, Z and E orifices
DK2503138T3 (da) 2011-03-24 2013-06-03 Omt Ohg Torino S P A Elektrisk styret brændstofindsprøjtningsindretning til store dieselmotorer
DE102012220610B4 (de) 2012-11-13 2015-04-02 Continental Automotive Gmbh Injektor

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Publication number Priority date Publication date Assignee Title
DE102009002554A1 (de) * 2008-07-23 2010-01-28 Robert Bosch Gmbh Kraftstoffinjektor für ein Kraftstoffeinspritzsystem

Also Published As

Publication number Publication date
WO2014075988A1 (fr) 2014-05-22
US20160319785A1 (en) 2016-11-03
US10662913B2 (en) 2020-05-26
EP2920452A1 (fr) 2015-09-23
CN104838129B (zh) 2017-08-08
DE102012220610B4 (de) 2015-04-02
CN104838129A (zh) 2015-08-12
DE102012220610A1 (de) 2014-05-15
IN2015DN02087A (fr) 2015-08-14

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