EP1485609B1 - Vorrichtung zum einspritzen von kraftstoff an stationären verbrennungskraftmaschinen - Google Patents

Vorrichtung zum einspritzen von kraftstoff an stationären verbrennungskraftmaschinen Download PDF

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Publication number
EP1485609B1
EP1485609B1 EP03704234A EP03704234A EP1485609B1 EP 1485609 B1 EP1485609 B1 EP 1485609B1 EP 03704234 A EP03704234 A EP 03704234A EP 03704234 A EP03704234 A EP 03704234A EP 1485609 B1 EP1485609 B1 EP 1485609B1
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EP
European Patent Office
Prior art keywords
fuel
injector
pressure
injection system
space
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.)
Expired - Lifetime
Application number
EP03704234A
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German (de)
English (en)
French (fr)
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EP1485609A1 (de
Inventor
Jaroslaw Hlousek
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the DE 198 37 332 A1 relates to a control unit for controlling the pressure build-up in a pump unit.
  • the control unit has a control valve and a connected thereto Valve operating unit on.
  • the control valve is as inward in the flow direction opening I-valve formed, which in a housing of the control unit having axially displaceably mounted valve body, the closed control valve from the inside seated on a valve seat of the control valve. It is a throttle arrangement provided by the flow through the control valve at by a small stroke h throttled open control valve. When opened by this stroke control valve the valve seat is still open, another valve seat formed on the control valve However, closed, so that the pumped medium through the throttle holes through the control valve flows.
  • the solenoid valve is used to control the Passage of a connection between an at least temporarily fluid high pressure brought high-pressure chamber, in particular a pump working chamber of a fuel injection pump and a low pressure room. It is a valve body inserted into a valve body and a bore disposed therein, in which a valve closing member in Shape of a piston from an electromagnet against the force of a return spring is displaceable.
  • the piston tapers, starting from a circular cylindrical surface via a conical surface to a reduced diameter, wherein the conical surface with a conical, surrounding a circular cylindrical surface of the piston High-pressure chamber with a reduced diameter of the piston surrounding connecting valve seat on the valve body cooperates.
  • DE 198 42 067 A1 discloses a fuel injection system for a diesel internal combustion engine, which is a high-pressure fuel pump in a high-pressure accumulator promotional high-pressure injection pump having. Furthermore, the fuel injection system with the high-pressure accumulator fluid-connected solenoid valve-controlled injectors, each of which has a Injection nozzle with a nozzle needle and a cooperating with this and a Control room delimiting control spool and one the pressure relief in the control room having controlling solenoid valve, wherein at each injector a storage volume of the High-pressure accumulator is provided and the storage volume of the high-pressure accumulator Connecting lines are connected together.
  • an injector principle regardless of the number of cylinders of the internal combustion engine, of the engine configuration (V-arrangement, W-arrangement, series arrangement) can, by instead of a rail component, the high-pressure supply line sections for connection be used by decentralized storage.
  • the high pressure supply sections in turn, the individual injectors connect with each other; they are interchangeable and can to different cylinder spacings of the cylinders on the individual cylinder banks adapted to the internal combustion engine.
  • the proposed solution offers increased flexibility in the construction of an injection system and its simpler Adaptability to different engine configurations, be it cylinder arrangements in V-, W- or in-line construction.
  • the principle of modularity is equally in the construction of the fuel injector used realized.
  • injectors intermediate plates at the respective injectors with trained in these inlet and outlet throttle, valve units and injector body for use.
  • the intermediate plate for example, the Drukkentlastung or pressurization of the control chamber of the injector by the dimensioning the throttle cross-sections influenced and to a variety of application conditions be adapted to the injector.
  • the modular injector used Injector body can be designed in different lengths and thus optimal be adapted to the available space.
  • the injector body comprises a storage space whose storage volume is about less than 80 times the maximum injected fuel quantity corresponds. This memory is by a header the fuel injector formed inlet throttle with high pressure fuel applied.
  • the integrated memory in the injector is the flow rate downstream of the fuel to the nozzle chamber limiting flow restrictor.
  • the Inlet throttle to the memory in the head region of the injector is preferably designed such a multiple injection is possible without pressure pulsations in the high-pressure line sections, which are connected to the head of the fuel injector, occur. This is also the stable pressure level in storage of the other injectors not disturbed for injecting fuel.
  • the pressure level can be in the injector body integrated storage space through the inlet throttle on a Keep pressure level, which corresponds to the pressure level, in one in one of the delivery units integrated pressure accumulator prevails.
  • the respective injection processes are independent of the engine configuration the internal combustion engine, the length of the high pressure line sections and the Cylinder number of the internal combustion engine.
  • the injection system can be due to the central memory arrangement for damping the pump pulsation at a plurality use differently configured internal combustion engines and thus reduces the number of variants in terms of the required components significantly.
  • the storage units associated storage space and the injector-side pressure accumulator are made by simple, modular design and therefore easily replaceable high-pressure line sections interconnected, whereby the adaptability of the injection system applicable to a wide variety of internal combustion engine configurations is simplified and the quality of the injections regardless of the line length the storage areas interconnecting pipe sections becomes.
  • FIG. 1 shows the components of an injection system.
  • the injection system shown in Figure 1 for supplying an internal combustion engine with fuel includes a fuel reservoir 1.
  • a feed pump 2 promotes from the Fuel tank 1 fuel.
  • the feed pump 2 is a high-pressure pump unit 3 downstream of which a throttle point 4 is connected upstream.
  • the throttle 4 is a variably configured throttle point, which are controlled via a control unit 12 can.
  • the feed pump 2 is a pressure control valve 8 downstream, which the inlet pressure to the high-pressure pump unit 3 controls and with the fuel reservoir 1 in Connection stands.
  • the high-pressure pump unit 3 comprises an integrated pressure accumulator 5.
  • the pressure accumulator 5 is secured by a pressure relief valve 7 whose outlet into the fuel reservoir 1 opens.
  • the integrated pressure accumulator 5 comprises a pressure sensor 6, which with the control unit 12 is in communication and on the in the integrated pressure accumulator. 5 prevailing pressure to the control unit 12 is reported back.
  • From the integrated pressure accumulator 5 branches off a first high-pressure line 9.
  • About the first high pressure line 9 can be, for example, the injectors 11 of the cylinder of a first cylinder bank a Supply internal combustion engine with high-pressure fuel.
  • a further high-pressure line 10 is for supply the injectors 11 of cylinders of another engine bank of an internal combustion engine indicated schematically, the cylinder of such an internal combustion engine can be arranged in V-construction.
  • third high-pressure feed line branch off to a third cylinder bank, for example in internal combustion engines whose cylinders are arranged in W-construction and therefore three or more cylinder banks are formed.
  • the first of the integrated pressure accumulator 5 laxative high pressure supply line 9 goes into a first line section 17 via.
  • the line section 17 is in the head region 15 of the injector 11 connected. From the head portion 15 of the injector 11, at the brennraum workedem End of an injector nozzle 16 is arranged, branches a first line section 17.1 from, which is connected to the head portion 15 of another injector 11. From his Head portion 15 branches another line section 17.2 to the head portion 15 of the next Injector 11 from.
  • injectors 11 for injecting fuel into the cylinder Continue combustion engine can be used.
  • the individual injectors 11 for the supply of Combustion chambers of an internal combustion engine with fuel are transmitted via the control unit 12 electronically controlled via actuators 14.
  • the individual injectors 11 are connected via low-pressure line sections 13 with a manifold, about which the leakage amount or control amounts of the injectors low pressure side of the Fuel reservoir 1 are supplied.
  • the injectors 11 a second and a third cylinder bank - which are not shown in Figure 1 - are on the low pressure side Low pressure lines 13 to the fuel reservoir 1 in conjunction, in which the Leakage or Abêtmengen the injectors 11 are fed back.
  • FIG. 2 shows the construction principle of an injector which is connected to injection systems according to the Representation of Figure 1 is used.
  • the injector nozzle 16 includes a nozzle needle 23 which is movable in the vertical direction is arranged.
  • the nozzle needle 23 comprises a needle guide 24, on which in the circumferential direction offset with respect to the nozzle needle 23, arranged individual flow areas are, via which of a nozzle needle chamber 40 of fuel to the nozzle needle tip flows, pending there and with vertical approach movement of the nozzle needle 23 via a or injected several injection ports 38 into the combustion chamber of the internal combustion engine becomes.
  • the nozzle needle 23 comprises a collar on which a spring 26 is supported.
  • the feather 26 acts on an upper collar of a sleeve-shaped component 25, which by the at the collar of the nozzle needle 23 supporting spring 26 against the underside of the intermediate plate 22 is pressed.
  • the sleeve-shaped component 25 and the upper end side the nozzle needle. 23 limit a control chamber 27, the pressurization or Pressure relief the vertical movement of the nozzle needle 23 within the nozzle body causes.
  • the nozzle chamber 27 is on the one hand by a running in the intermediate plate Inlet restrictor 28 via a high-pressure fuel line 29 with high pressure Fuel is applied.
  • the control chamber 27 via a likewise in the Intermediate plate 22 trained outlet throttle element 30 depressurized.
  • a valve 31 is provided in the control part 21, which has a in the injector 20 trained actuator 34 is actuated.
  • the actuator 34 is in the Schematic diagram according to the illustration in Figure 2 designed as a ring magnet and is about the control 14 is controlled by the control unit 12.
  • the valve 31 is provided with a Ankerartigen valve plate 32 is provided, which is enclosed by an electromagnet 34 Spring element 33 is pressed in its formed in the control part 21 seat 42.
  • Seat 42 i. not activated actuator 34
  • is a drainage channel 41 which is the Outflow throttle 30 of the control chamber 27 is connected downstream, closed.
  • meandering configured Drainage channel which is provided with a flow channel 43 which is formed in the injector body 20, in Connection stands. Via the drainage channel 43, the volume of depleted fuel flows into the provided on the low pressure side lines 13 (see illustration according to Figure 1).
  • the injector body 20 of the fuel injector 11 comprises a storage space 36.
  • the storage volume in the storage space 36 is less than 80 times the maximum injection quantity, which via the injection openings 38 on the injector nozzle 16 in one in Figure 2 not shown combustion chamber of an internal combustion engine is injected.
  • Prefers the storage volume of the storage space 36 is 60 to 80 times the injection quantity.
  • the storage space 36 in the head region 15 of the injector 20 is about an inlet throttle 37 pressurized fuel under high pressure.
  • the inlet throttle 37 in turn branches from a likewise in the head region of the injector body 20th trained channel 44 from.
  • the channel 44 is on the one hand via the line section 17 of High-pressure supply line 9 is acted upon by high-pressure fuel; on the other hand is the channel 44 in the head portion 15 of the injector 20 over the first line section 17.1 with a further head region 15, not shown here, of another one Fuel injector 11 in conjunction.
  • the channel cross-section of the channel 44 in the head area 15 of the injector 20 is designated by reference numeral 45.
  • About the pipe section 17 of the high pressure line 9 are therefore in the high pressure pump unit 3 integrated pressure accumulator 5 and - with the interposition of the inlet throttle 37 - the Pressure accumulator 36 within the injector body 20 in conjunction.
  • the sizing the inlet throttle 37 between the channel 44 in the head region 15 of the injector body 20th and the injector-side storage space 36 ensures the independence of the individual Injection processes regardless of the number of cylinders of the internal combustion engine, regardless of their engine configuration, whether in a series construction, in V-arrangement or in W-arrangement as well as independent of the length of the individual connecting lines among themselves. Furthermore, by appropriate design of the inlet throttle 37th to the storage space 36 in the injector body 20 ensures that several times in succession switched injection operations are possible without that in the storage space 36 and in the Line sections 17 and 17.1 build pressure pulsations and thereby others Fuel injection injectors 11 are affected. This allows pre, main and Allow post-injection phases without pressure pulsation.
  • the inlet throttle 37 to the storage space 36 allows maintaining nearly identical pressure levels in storage space 36 the injection process and the integrated pressure accumulator 5 of the high-pressure pump unit 3.
  • the throttle geometry of the inlet throttle 37 to the storage space with different skillsflußbei gene executed, as the representation of Figure 2a, see. Reference numeral 37.1, can be removed.
  • the storage space 36 in the injector 20 of the fuel injector 11 is a flow restrictor 35 downstream.
  • the body of the flow restrictor 35 includes a transverse bore with throttle effect 54 and is biased by a spring element 46.
  • the flow restrictor 35 is the storage space 36 nach- and the high-pressure fluid line 29th upstream of the injector body 20.
  • About the flow restrictor 35 is an undesirable Excessive amount of malfunction that prevents, for example, when the nozzle is leaking or limited such that the occurrence of an undesirable excess only at an injection process is possible.
  • the transverse bore 54 formed such that it is perpendicular to the axis of symmetry of the body of the naturalflußbegrenzers 35 extends, wherein the bottom portion of the body of the flow restrictor is closed, so that an outflow of fuel only through the openings the transverse bore 54 in the wall of the body of the flow restrictor 35 sets
  • the at the flow restrictor 35 in the injector body 20 subsequent high-pressure fuel line 29 extends through the control part 21 before the high-pressure fuel line 29 in the intermediate plate 22 opens into a two-armed channel.
  • An arm the channel in the intermediate plate 22 runs in the inlet throttle 28 for pressurizing of the control chamber 27, while the further arm of the channel in a nozzle needle chamber 40 opens.
  • the modular fuel injector 11, an injector body 20, a control part 21, comprising the intermediate plate 22 and an injector nozzle 16 is, with the aid of a Union nut formed nozzle retaining nut 39 mounted.
  • the modular design favorably, the intermediate plate 22, in which the inlet throttle 28 and the outlet throttle 30 are formed, against another intermediate plate 22 the same To replace height, in which the inlet throttle 28 and the control chamber 27 relieving Outflow throttle 30 formed in larger or smaller diameter geometries are to exchange.
  • the modular structure of the fuel injector 11 according to the Schematic representation in Figure 2 also offers the advantage of a different feasibility the injector body 20 in different heights in the cylinder head area an internal combustion engine resulting space in an advantageous manner exploit.
  • Figure 2a shows an enlarged view of the throttle geometry of a supply throttle point to the storage room.
  • the inlet throttle 37 has advantageously on the line sections 17, 17.1 assigning side of a rounded inlet, which is an inflow of fuel in the Memory space 36 favors.
  • the throttle bore of the inlet throttle 37 narrows in Direction to their mouth point in the storage space 36 continuously.
  • the angle, in which conically tapering the cross-sectional constriction in the direction of the storage space 36 is formed, is preferably in the range between 10 ° and 20 °, based on the Symmetrical axis of the throttle bore of the inlet throttle 37.
  • the throttle bore is sharp-edged, which a back flow of fuel via the inlet throttle 37 in the channel 44 between the line sections 17, 17.1 counteracts.
  • FIG. 3 shows the longitudinal section through an alternative embodiment of the fuel injector FIG. 2.
  • the high-pressure fuel line 29 extends slightly inclined through the injector body 20 and goes into a corresponding bore section on the control part 21, passes through the intermediate plate 22 before the high-pressure fuel line 29 at the nozzle needle space 40 of the injector nozzle 16 opens.
  • the nozzle needle 23 is in one Needle guide 24 movably mounted in the vertical direction.
  • the nozzle needle 23 is over a Spring element 26 pressurized.
  • the valve 31 is received, the valve disc 32 via a ring magnet trained actuator 34 is movable in the vertical direction.
  • the ring magnet 34 encloses the valve 31 in its closed position acting on closing spring 33; the electromagnet 34 of the valve 31 actuating actuator is connected via leads 14, the extend in a substantially vertical direction through the injector 20, driven, the corresponding connection connection 55 is formed laterally on the injector body 20 and designed as a plug contact.
  • the injector nozzle 16 enclosing nozzle retaining nut 39 also takes the intermediate plate 22 and the actuatable valve 31 receiving control part 21.
  • the nozzle lock nut 39 and the lower end of the injector body 20 are bolted together.
  • both the one control chamber in the intermediate plate 22 27 pressurizing inlet throttle 28 and the pressure-relieving the control chamber 27 Outflow throttle 30 is formed, but not shown in the illustration of Figure 3, see. to schematic representation of Figure 2.
  • FIG. 4 shows the plan view of the embodiment variant of the injector according to FIG. 3.
  • the insert 51 shown partially cut. At the outgoing at an angle chamfers of the channel 44 become the line sections 17 shown in FIGS. 1 and 2 or 17.1 of the first high pressure line 9 connected. From the channel 44 in the insert 51 branches off the inlet throttle 37, with the formed in the insert 51 storage space 36 is pressurized with high pressure fuel. The insert 51 and the injector body 20 of the fuel injector 11 are connected via a clamping nut 50 with each other screwed.
  • the connectors 55 recognizable, with which an example configured as an electromagnet Actuator, which may be included within the injector body 20 is driven.
  • Reference numeral designates the nozzle lock nut 39, in which both the injector 16 as also the overlying intermediate plate 22 and the control part 21 are received and with their trained at the top of internal thread these components with the be mounted on the combustion chamber side end of the injector body 20.
  • the fuel in the combustion chambers of Internal combustion engine their cylinders are in series construction, in V-arrangement or arranged in W-arrangement, injected.
  • FIG. 5 shows an embodiment of the fuel injector with transverse storage space in the plan view.
  • the line section 17 and the first line section 17.1 extends through the housing of the storage space 36 of the channel 44, which is formed in the channel cross-section 45 is.
  • the separated by a cavity in the housing of the storage space 36 Channels open into this, in which an inlet throttle body 37 is inserted.
  • the body of the inlet throttle 37 has at the said cavity opposite End of a flow-favorable throttle geometry 37.1 and can at the inlet point be rounded.
  • the throttle channel can be a continuously on its orifice in the storage space 36 narrowing cross-section, wherein the wall of the Throttle bore within the throttle body 37 at an angle between 10 ° and 20 ° in With respect to the center line of the throttle bore obliquely.
  • the in the embodiment according to FIG. 5 in transverse orientation 48 in the head region 15 of the fuel injector 11 recorded storage space is by a closure 47, for example, as a screw-in may be formed, pressure sealed.
  • the here in dashed Execution indicated flow restrictor 35 is connected to the interior of the storage space 36 installed in the transverse direction 48 via a channel 49 in connection. Over the channel 49 flows fuel from the interior of the storage space 36 to the flow restrictor, the Flow of fuel in the direction through the high-pressure fuel line 29 to the injector of the fuel injector 11 controls.
  • Figure 6 shows the embodiment of the fuel injector according to Figure 5 with in the transverse direction built-in storage space on average.
  • the channel 49 which connects the storage space 36 with the flow restrictor 35, tangent to the circumference the storage space 36 branches off to material-fatiguing pressure loads of the material of the injector body 20.
  • the Injector 20 sealed pressure-tight by a screw 47.
  • the screw-in closure 47 favors the simple assembly of the flow restrictor 35 acting on Spring 46, which in the interior of the injector body 20 above the high-pressure fuel line 29 is inserted.
  • the flow restrictor 35 shown in FIG. 6 likewise comprises a transverse bore 54 and is analogous to the representation of the flow restrictor 35 in the embodiment the solution proposed by the invention by a trained as a spiral spring Spring element 46 biased.
  • Figure 7 shows the schematic representation of a variant with a high-pressure fitting as part of an injector body.
  • the fuel injectors 11th according to the scheme shown in FIG. 7, not directly above that in the head area 15 the injector extending channels 44 between the line sections 17, 17.1 and 1.2 acted upon by the inlet throttle 37.
  • a high-pressure line connection piece 100 extends between the inlet throttles 37, preferably in a geometry according to the geometry shown in Figure 2a on an enlarged scale.
  • This high-pressure line connection piece 100 acts on the fuel injector 11 with high Pressurized fuel.
  • the throttle 4, the high-pressure pump unit 3, pressure sensor 6, the pressure relief valve. 7 and the high pressure line 9 and 10 to the cylinder banks of the internal combustion engine essentially correspond to the components already shown in FIG Injection system.
  • Figure 8 shows a schematic diagram of the high-pressure connection piece, which is located between the channel 44 and the injector body 20 of the fuel injector 11 extends.
  • the inlet throttle 37 is acted upon by a channel 44 is formed in a channel cross section 45.
  • the high-pressure connector 100 is applied, which is another Storage space 36.1 comprises, which is substantially symmetrical to the axis 103 of the high pressure fitting 100 is formed.
  • the high pressure fitting 100 extends in a length 101 between the head portion 15 and the injector body 20 of the fuel injector 11.
  • the fuel injector 11 comprises a union nut 39 shown here schematically, via which the injection nozzle part 16 is connected to the injector 20 at a screw connection.
  • the High pressure fitting 100 a further storage space 36.1 comprising substantially is tubular, is at a designed as a screw connection point 102 is connected to the injector body 20 of the fuel injector 11.
  • FIG. 9 shows the illustration of further installation components in a fuel injector below of the integrated in the injector body storage space.
  • the inlet throttle 37 which is not shown in FIG. 9, is under high pressure Fuel acted upon further storage space 36.1, in the high-pressure line connection 100 is formed, extends substantially coaxially to the axis of symmetry 103rd of the high pressure line fitting. This im preferably by means of a screw thread 102 laterally screwed into the injector body 20 of the fuel injector 11. in the Area of a transitional bore 106, the fuel volume flows from the other Storage space 36.1 in the storage space 36 in the interior of the injector body 20 of the fuel injector 11 over. The storage space 36 within the injector body 20 is over a Screw-in closure 47 at the top of the fuel injector 11 sealed pressure-tight.
  • Reference symbol 43 denotes the leakage oil channel, while with reference numeral 14, the control of the solenoid valve, not shown in Figure 9 34 is designated, of which the closing spring 33 is shown only schematically is.
  • the loading of the storage space 36th indirectly via a further storage space 36.1, in the interior of a high-pressure line connection 100 is integrated can in comparison to the embodiment according to Figure 2 shows the height of the injector, which is usually in the cylinder head area of self-igniting Internal combustion engines must be accommodated, reduced what its installation options in the cylinder head area improved.
  • FIG. 6 shows the embodiment of the memory arrangement in the transverse direction 48 Also significantly improve the installation height of a fuel injector, so that a more flexible design of injectors is possible, in particular an integration the inventively proposed, a storage space 36 and a further storage space 36.1 in a high-pressure connection piece 100 having fuel injectors 11 in the cylinder head area can be significantly improved.

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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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
EP03704234A 2002-03-08 2003-01-20 Vorrichtung zum einspritzen von kraftstoff an stationären verbrennungskraftmaschinen Expired - Lifetime EP1485609B1 (de)

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DE10210282 2002-03-08
DE10210282A DE10210282A1 (de) 2002-03-08 2002-03-08 Vorrichtung zum Einspritzen von Kraftstoff an stationären Verbrennungskraftmaschinen
PCT/DE2003/000139 WO2003076794A1 (de) 2002-03-08 2003-01-20 Vorrichtung zum einspritzen von kraftstoff an stationären verbrennungskraftmaschinen

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EP1485609A1 EP1485609A1 (de) 2004-12-15
EP1485609B1 true EP1485609B1 (de) 2005-11-02

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US (1) US7025045B2 (zh)
EP (1) EP1485609B1 (zh)
JP (1) JP4404640B2 (zh)
CN (1) CN100365269C (zh)
AT (1) ATE308677T1 (zh)
DE (2) DE10210282A1 (zh)
WO (1) WO2003076794A1 (zh)

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US11542902B2 (en) * 2018-07-26 2023-01-03 Liebherr-Components Deggendorf Gmbh Connecting piece for a fuel injector of an internal combustion engine

Also Published As

Publication number Publication date
DE50301551D1 (de) 2005-12-08
DE10210282A1 (de) 2003-09-25
EP1485609A1 (de) 2004-12-15
CN1507538A (zh) 2004-06-23
US20040187848A1 (en) 2004-09-30
JP4404640B2 (ja) 2010-01-27
JP2005519233A (ja) 2005-06-30
CN100365269C (zh) 2008-01-30
ATE308677T1 (de) 2005-11-15
US7025045B2 (en) 2006-04-11
WO2003076794A1 (de) 2003-09-18

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