EP2920452A1 - Injektor - Google Patents
InjektorInfo
- Publication number
- EP2920452A1 EP2920452A1 EP13788759.2A EP13788759A EP2920452A1 EP 2920452 A1 EP2920452 A1 EP 2920452A1 EP 13788759 A EP13788759 A EP 13788759A EP 2920452 A1 EP2920452 A1 EP 2920452A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- bore
- leakage
- control piston
- nozzle needle
- 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.)
- Granted
Links
Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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 housing, an actuator and a nozzle needle, wherein the actuator is arranged in an actuator chamber of the injector, wherein 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 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 for transporting a pressurized standing fuel to the nozzle needle is designed.
- 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.
- Injector housing includes a control piston bore in which a control piston is arranged. Between the actuator chamber and the control piston bore a leakage pin bore is provided, in which a leakage pin is arranged, which couples the control piston with the piezoelectric actuator. Furthermore, a high pressure line is provided, which is designed for transporting a pressurized fuel to the nozzle needle. In the area of the leakage pin bore, this injector requires a precisely matched clearance between the leakage pin hole and
- Leaking pen which is expensive to produce in the production. Furthermore, 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.
- an improved injector can be provided by the injector comprising an injector housing, an actuator and a nozzle needle.
- the actuator is arranged in a Aktor Hurm the Inj ektorgephinuses.
- the injector housing comprises a control piston bore, in which a control piston is arranged, wherein a leakage pin bore is provided between the actuator chamber and the control piston bore, 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.
- High-pressure line is provided, which is designed for transporting a pressurized fuel to the nozzle needle. Furthermore, 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 of 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. Furthermore, narrower margin for both the
- Leakage pen as well as the leakage pin hole as well as for the control piston and the control piston bore are selected, so that the stiffness of the injector is increased, thus reducing a 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.
- Leakage pin bore be slipped and thus further the wear between the leakage pin and the leakage pin hole or the control piston and the control piston bore is further reduced.
- 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 between the leakage pin and the
- Leakage pin bore a second guide clearance is provided, through which a third fuel leakage flow is able to pass into the actuator chamber.
- the supply line can be easily manufactured if an intermediate plate is provided between the actuator chamber and the control piston bore, in which the supply line and the
- 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 substantially perpendicular to the high pressure line and / or the
- Leakage pin hole is arranged.
- the supply line is substantially at an angle to the high-pressure line and / or to the
- Leakage pin hole is arranged, wherein the supply line opens into an upper or lower portion 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.
- a throttle is provided in the supply line. In this way, the cross-sectional area for the flow of fuel defined in the supply line can be defined in a simple manner.
- a particularly good operating behavior and a particularly low leakage and thus a particularly energy-efficient injector can be provided when the throttle has a first cross-sectional area and the leakage pin and the leakage pin bore form a second cross-sectional area in a plane transverse to a longitudinal axis of the injector first cross-sectional area has the same size as the second cross-sectional area.
- 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.
- FIG. 1 shows a longitudinal section through a lower portion of an injector according to a first embodiment
- FIG. 2 shows a longitudinal section through an upper section of the injector shown in FIG. 1
- FIG. 3 shows a section of the injector shown in FIGS. 1 and 2
- FIG. 4 shows a detail of an injector according to a second embodiment
- Figure 5 shows a detail of an injector according to a third embodiment
- FIG. 6 shows a detail of an injector according to a fourth embodiment.
- FIG. 1 shows a longitudinal section through a lower portion of an injector 10 according to a first embodiment.
- FIG. 2 shows a longitudinal section through an upper portion 11 of the injector 10 shown in Figure 1 and
- Figure 3 shows a detail A of the injector 10 shown in Figures 1 and 2, wherein the cutout A is marked in Figure 1 by means of a dashed line.
- the figures 1 to 3 will be explained together.
- 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 includes a parallel to a longitudinal axis 20 extending high ⁇ pressure line 25, which can be supplied via a high-pressure port 30 under high pressure fuel.
- 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 magnetostrictive actuator could also be arranged in the actuator chamber 45.
- the actuator chamber 45 further has a leakage connection 51 for leakage connection 40 and thus is part of a low ⁇ print area 52 of the injector 10.
- the piezoelectric actuator 50 is preferably formed as a fully active piezo stack and has a cylindrical shape approximately, and is via an electric terminal 54 supplied with an 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 has a STEU ⁇ erkolbenbohrung 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 76 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 76 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 90 of the control piston 65, from the control piston bore 60.
- 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.
- control piston 65 shown in FIGS. 1 and 2 although differently shaped, is functionally identical.
- the configuration of the control piston 65 shown in FIGS. 3 to 6, wherein the piston chamber 80 is formed as a bore in the control piston 65 for receiving the control piston spring 85 offers the advantage that the spring 85 can be completely accommodated in the control plate 130.
- 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 bore 105 is also a
- Leakage pin 110 is arranged, which bears 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.
- Leak pin hole 105 is selected such that when increasing the length of the piezoelectric actuator 50 in the direction of the longitudinal axis 20, the change in length of the piezoelectric actuator 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 is located above at one
- Control plate 130 in which the control piston bore 60 is arranged. Below the control plate 130 is applied to this on ⁇ closing plate 135.
- the high-pressure line 25 extends through the connection plate 135, the control plate 130 and the intermediate plate 125. Underneath the connection plate 135, a nozzle needle housing 140 abuts the latter, 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
- 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 away acting 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 region of the nozzle tip 190 from a ⁇ outlet opening 195 is provided which is closed by the nozzle needle tip 190th
- the high pressure line 25 is standing with a high pressure (1000 to 3000 bar) fuel, such as a rail of a common rail injection system can be filled and thus is part of a high-pressure region 200 of the injector 10 via the high ⁇ pressure line 25, the fuel is promoted to the nozzle needle bore 145.
- 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 Ki. Via the first connection bore 165, the first fuel leakage flow Ki 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 against the second
- 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 current K 2 combined with the first fuel leakage flow Ki.
- 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. Furthermore, the first and the second fuel leakage flow Ki, 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 is replaced by the nozzle needle 155 in FIG. delbohrung 145 prevailing pressure on the underside in the area of the nozzle needle tip 190 is raised 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
- the volume of the first control chamber 75 is reduced and the fuel contained therein is pressed via the first connecting bore 165 into the second control chamber 160. Furthermore, part of the fuel flows via a third fuel leakage flow K3 into the actuator chamber 45.
- the increase in pressure causes the pressure is greater by the located in the second control chamber 160 fuel and the force of the SI ⁇ nozzle needle spring 175, as represented by the pressurized fuel in the nozzle needle hole 145 for lifting the nozzle needle 155, so that the nozzle needle 155 again is pressed down so that the nozzle needle tip 190 closes the outlet ⁇ opening 166 in the injector 15.
- the supply line 225 is arranged at an angle to the longitudinal axis 20 or the leakage pin 110 in FIGS. 3 and 4 and terminates in an upper region of the upper
- 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 255 can be introduced through an inserted obliquely drill through the already introduced in 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.
- Fuel leakage flow K3, in the first control chamber 75 via the supply line 225 is zero.
- the total amount of fuel that flows in the feed line 225 in this state flows in the gap between the leakage pin bore 105 and the leakage pin 110 as fuel leakage flow K 4 into the low-pressure region 52. Since the leakage flow balance condition that the inflowing fuel leakage flow is equal to the outflowing
- Fuel leakage current is, must be satisfied for the first and second control chamber 75, 160, this means that the sum of fuel leakage flow Ki and fuel leakage flow K 2 must be equal to zero.
- the second guide play 205 and the piston play 215 it is possible to design the second guide play 205 and the piston play 215 to be of minimal guide play, so that jamming during operation of the injector 10 is avoided.
- a requirement for minimum leadership game in the piston clearance 215 and second guide clearance 205 to ensure minimum leakage currents are avoided.
- 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 as well as the piston play 215 with respect to one by the first and second guide play 121 and 205 and piston play 215 to a
- FIG. 4 shows a detail A of the injector shown in FIG. 1 according to a second embodiment.
- the injector 230 is substantially identical to the injector shown in FIG.
- a throttle 235 is provided in the supply line 225, which adjacent to the
- Leakage pin hole 110 is arranged. 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 to ensure a movement of the leakage pin 110 is selected as clearance.
- the first cross-sectional area is approximately the same size as the second cross-sectional area.
- the functional robustness of the injector against a possible wear on the leakage pin 110 is minimized by the fact that the first guide game can be optimally adapted to the loading ⁇ loads of the leakage pin 110 in the leakage pin bore 105 121st
- the first guide play 121 can be selected such that during the up-and-down movement of the fuel located in the second guide game 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 K3 to the actuator chamber 45 is minimized.
- FIG. 5 shows a section of the injector 240 shown in FIGS. 1 to 4 according to a third embodiment.
- the injector 240 is essentially identical to the injector shown in FIGS. 1 to 4.
- the intermediate plate 125 comprises, in addition to the embodiment shown in FIGS. 1 to 4, a first intermediate plate part 245 and a second intermediate plate part 250.
- the first intermediate plate part 245 is arranged adjacent to the actuator chamber 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 detail of the injector shown in FIG. 1 according to a fourth embodiment.
- the injector 265 is essentially identical to the injector shown in FIG.
- a throttle 265 is provided in the supply line 260, which is arranged adjacent to the leakage pin bore 105.
- the throttle 265 is formed in terms of their dimensions similar to the throttle explained in Figure 4.
- the throttle 265, as also explained above, spaced from the leakage pin bore 105 are arranged. In this way, the fuel leakage flow K3 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. This also has the consequence that particles, for example, within the
- the throttle 235, 265 can also be arranged adjacent to the high-pressure line 25. It is also conceivable that the first cross-sectional area of the throttle 235, 265 is nominally greater than the second cross-sectional area of the first guide clearance 121.
Landscapes
- 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)
Abstract
Description
Claims
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 (de) | 2012-11-13 | 2013-11-07 | Injektor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2920452A1 true EP2920452A1 (de) | 2015-09-23 |
| EP2920452B1 EP2920452B1 (de) | 2017-06-07 |
Family
ID=49552368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13788759.2A Active EP2920452B1 (de) | 2012-11-13 | 2013-11-07 | Injektor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US10662913B2 (de) |
| EP (1) | EP2920452B1 (de) |
| CN (1) | CN104838129B (de) |
| DE (1) | DE102012220610B4 (de) |
| IN (1) | IN2015DN02087A (de) |
| WO (1) | WO2014075988A1 (de) |
Families Citing this family (2)
| 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 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| BRPI0708551B1 (pt) | 2006-03-03 | 2019-07-02 | Ganser-Hydromag Ag | Válvula de injeção de combustível para a injeção intermitente de combustível dentro da câmara de combustão de um motor de combustão interna |
| 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 |
| DE102009002554A1 (de) * | 2008-07-23 | 2010-01-28 | Robert Bosch Gmbh | Kraftstoffinjektor für ein Kraftstoffeinspritzsystem |
| 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 |
| EP2503138B1 (de) | 2011-03-24 | 2013-05-08 | OMT Officine Meccaniche Torino S.p.A. | Elektrisch gesteuerter Kraftstoffeinspritzer für große Dieselmotoren |
| DE102012220610B4 (de) | 2012-11-13 | 2015-04-02 | Continental Automotive Gmbh | Injektor |
-
2012
- 2012-11-13 DE DE102012220610.8A patent/DE102012220610B4/de not_active Expired - Fee Related
-
2013
- 2013-11-07 EP EP13788759.2A patent/EP2920452B1/de active Active
- 2013-11-07 CN CN201380059352.8A patent/CN104838129B/zh active Active
- 2013-11-07 WO PCT/EP2013/073297 patent/WO2014075988A1/de not_active Ceased
- 2013-11-07 US US14/442,471 patent/US10662913B2/en active Active
- 2013-11-07 IN IN2087DEN2015 patent/IN2015DN02087A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP2920452B1 (de) | 2017-06-07 |
| WO2014075988A1 (de) | 2014-05-22 |
| DE102012220610A1 (de) | 2014-05-15 |
| US20160319785A1 (en) | 2016-11-03 |
| DE102012220610B4 (de) | 2015-04-02 |
| CN104838129B (zh) | 2017-08-08 |
| US10662913B2 (en) | 2020-05-26 |
| CN104838129A (zh) | 2015-08-12 |
| IN2015DN02087A (de) | 2015-08-14 |
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