EP2836696B1 - Injektor eines modularen common-rail-kraftstoffeinspritzsystems mit durchflussbegrenzer - Google Patents

Injektor eines modularen common-rail-kraftstoffeinspritzsystems mit durchflussbegrenzer Download PDF

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Publication number
EP2836696B1
EP2836696B1 EP13715200.5A EP13715200A EP2836696B1 EP 2836696 B1 EP2836696 B1 EP 2836696B1 EP 13715200 A EP13715200 A EP 13715200A EP 2836696 B1 EP2836696 B1 EP 2836696B1
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EP
European Patent Office
Prior art keywords
injector
holding body
pressure
injector according
accumulator
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
EP13715200.5A
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German (de)
English (en)
French (fr)
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EP2836696A1 (de
Inventor
Martin Bernhaupt
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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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention relates to an injector of a modular common rail fuel injection system having a high-pressure accumulator integrated in the injector body, the injector having an injection nozzle with axially displaceably guided, surrounded by a nozzle chamber nozzle needle, a high-pressure accumulator with the nozzle chamber connecting high-pressure line and a holding body, the the front side with the component forming the high-pressure accumulator, in particular storage tube is screwed and through which the high-pressure line passes, wherein a flow restrictor for limiting the amount of fuel delivered from the high-pressure accumulator to the injection nozzle is arranged downstream of the high-pressure accumulator.
  • Such an injector is in the DE 10210282 A1 described.
  • Modular common rail systems are characterized in that part of the storage volume present in the system is present in the injectors themselves.
  • Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other.
  • the sole use of a common rail for all injectors is not useful in such engines, as it would come to a massive slump in injection pressure due to the long lines during injection, so with prolonged injection duration, the injection rate would noticeably break.
  • it is therefore intended to arrange a high-pressure accumulator inside each injector.
  • Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module.
  • a high-pressure accumulator Under a high-pressure accumulator is not to be understood a common line, but it is a pressure-resistant vessel with an inlet and outlet whose diameter compared to the high pressure lines is significantly increased so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
  • leaks can occur under unfavorable conditions, be it in the piping system or through defective injectors. Injectors with jamming nozzle needles, which lead to continuous injections into the combustion chamber, can cause considerable damage. These damages can lead to the fire of the vehicle or to the destruction of the engine.
  • flow rate limiter with closing function are known, which close the inlet to the affected injector when a maximum withdrawal amount from the high-pressure accumulator is exceeded, and thus decouple the high-pressure injection side from the injection valve side.
  • flow restrictors are usually arranged upstream of the storage volume.
  • top-feed injectors the fuel is supplied via a high-pressure port of the injector at the top of the high-pressure accumulator
  • the flow restrictor is usually attached to the upper end of the injector.
  • side-feed injectors the supply of the fuel takes place via a lance which contacts the injector laterally
  • the flow restrictor is usually arranged in front of the pressure pipe stub in a T-piece.
  • the flow restrictor housing is either pressed into the injector holder body or mounted with a retaining ring in the holding body.
  • Flow restrictors which are arranged in terms of flow in front of the storage volume, inherently have the disadvantage that they are to set much inaccurate. The reasons for this are the dead time and the damping effect of the storage volume and the influence of different fuel parameters such as temperature and viscosity or the fuel type (diesel or heavy oil).
  • a further disadvantage of the flow restrictor arranged in the flow medium in front of the storage volume is that a considerably larger amount can still be injected when closing the flow restrictor due to the expansion volume of the high-pressure accumulator. This property is repeatedly classified as very critical, especially in the very conservative business of large marine engines.
  • the installation of the flow restrictor at the top of Topfeed injectors also increase the mass there and thus worsen the vibration load capacity of the injector. Sidefeed injectors require a complex T-piece. Thus, two different solutions are required for the two injector concepts, which increases the variety of components.
  • Flow restrictors which are installed according to the storage volume (see eg DE102007025050 ), require in the pressed construction a press fit in the holding body or in a mounting with locking ring complex Bohrungsverschneidungen. Both constructions are very unfavorable in terms of fatigue strength in the extreme pressure loads prevailing in common-rail systems. For example, in systems with a system pressure of 2200 bar pressure loads of up to 2500 bar can be observed.
  • the present invention therefore aims to increase the fatigue strength, wherein in the holding body in particular interference fits and punctures for retaining rings or additional critical Bohrungsverschneidungen should be avoided. Furthermore, the same design concept for topfeed and sidefeed injectors should be used. Overall should be created with the same component cost as in the prior art training with a functionally optimal flow restrictor without the high pressure capacity of the holding body or the high-pressure accumulator is adversely affected.
  • the invention provides an injector according to claim 1.
  • the flow restrictor is inserted between the holding body and the storage tube, the benefits of flow moderately built according to the storage volume flow restrictors are used. Characterized in that the flow restrictor is inserted between the holding body and the storage tube and fixed by the screwing of the holding body and storage tube, eliminating the need for pressing or securing using a locking ring, and there is a very simple construction, which has a high fatigue strength.
  • the flow restrictor is in this case held only by the axial force generated during screwing of the holding body with the storage tube and clamped between these two components without the need for further fasteners as it were.
  • a preferred development of the invention provides that the holding body and the flow restrictor component are secured against rotation by means of an axial fixing pin.
  • the flow restrictor has a shoulder with a conical first sealing surface which cooperates with a formed on a shoulder of the storage tube conical sealing surface.
  • Another high-pressure-tight connection is preferably achieved in that the flow restrictor component on the end face facing the holding body has a conical second sealing surface which cooperates with a conical sealing surface formed on an end face of the holding body.
  • the arrangement of an anti-rotation in the form of locking pins can be omitted.
  • the further high-pressure line is designed as a resonator line, which is connected to the high-pressure accumulator via a resonator throttle.
  • the fluid connection of the flow restrictor to the two high-pressure lines can also take place in such a way that the high-pressure line and the additional high-pressure line are connected to the flow restrictor via a bore intersection formed in the flow restrictor component.
  • This embodiment is particularly advantageous for sidefeed injectors, where it is necessary that when closing the flow restrictor no amount of fuel directly from the side fuel inlet to the injector (bypass of the flow restrictor) can flow.
  • connection of the fuel supply to the high pressure accumulator is preferably such that the injector has a side port for the fuel supply, which communicates with an inlet bore, the first portion is formed in the holding body and the second portion passes through the flow restrictor axially.
  • a bypass of the flow restrictor is preferably prevented in that the flow restrictor component on the end face facing the holding body has a planar second sealing surface which cooperates with the planar end face of the holding body.
  • the flow restrictor component comprises a housing with a high-pressure accumulator-side housing inlet and a housing body-side housing outlet, a longitudinally displaceable in a chamber of the housing between a starting position and an end position and against the flow direction spring-biased closing member. This connects the housing inlet and housing outlet hydraulically via at least one throttle having a channel channel and further controls a flow connection between the housing inlet and the housing outlet.
  • a retaining ring fixed in the flow restrictor component defines the starting position of the closing member.
  • FIG. 1 the schematic structure of an injector of a modular common rail fuel injection system according to the prior art
  • Fig. 2 a detailed view of the injector in area II of Fig. 1 in a first training
  • Fig. 3 a detailed view of the injector in a second embodiment
  • Fig. 4 a detailed view of the injector in a third embodiment
  • Fig. 5 a detailed view of the injector in a fourth embodiment.
  • an injector 1 having an injection nozzle 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high pressure accumulator 6, wherein a screwed to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the valve plate. 4 holds together.
  • the solenoid valve 13 is closed, so that high-pressure fuel from the high-pressure accumulator 6 via the high-pressure line 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but at the valve seat of the solenoid valve 13 is blocked.
  • a resonator 20 may be arranged with a high pressure storage side resonator 21, with which occurring pressure peaks can be lowered more quickly.
  • topfeed injector The supply of high-pressure fuel from a high-pressure pump not shown in the injector 1, via a arranged on the top of the injector 1 high-pressure port 22 (topfeed injector).
  • the fuel supply via a side of the injector 1, in particular on the holding body 5 arranged high-pressure port 23, and a high-pressure accumulator 6 leading inlet bore 24 made (sidefeed injector).
  • FIGS. 2 to 5 show a view of the detail X of the Fig. 1 with the flow restrictor arranged between the storage tube 25, the high-pressure accumulator 6 and the holding body 5.
  • the trainings according to FIGS. 2 to 5 is that the flow rate regulator is formed in a separate flow restrictor component 26.
  • the flow restrictor member 26 has a first axial portion 27 and a second axial portion 28, the second axial portion 28 having a larger outer diameter than the first axial portion 27 axial portion 28, the flow restrictor 26 has a shoulder with a tapered first sealing surface 29 which cooperates with a formed on a shoulder 30 of the storage tube 25 conical mating sealing surface.
  • the shoulder 30 of the storage tube 25 is connected via an annular groove-like recess 31 with a thinner walled, provided with an internal thread 33 portion 32 of the storage tube 25.
  • the flow restrictor 26 is inserted between the holding body 5 and the storage tube 25 and fixed by the screw connection of these two components. In this case, the flow restrictor 26 is secured by means of pins 34 against rotation.
  • the seal to the holding body 5 takes place in the embodiment according to the Fig. 2, 3rd and 5 via a flat sealing point, which is formed by a plane face formed on the end face facing the holding body 5, which cooperates with the planar end face of the holding body 5.
  • the flow restrictor member 26 has an inlet 36 and an outlet 37.
  • a displaceably guided in the axial direction piston 39 is arranged, which is pressed by means of the compression spring 40 against the retaining ring 41.
  • the piston 39 has a blind hole 42, which communicates on the one hand with the inlet 36 and on the other hand via a throttle bore 43 with the outlet 37.
  • the amount of injection is removed from the chamber 38.
  • the piston 39 moves against the spring force in the direction of the lower sealing seat 44, without, however, reaching it.
  • the compression spring 40 pushes the piston 39 back to the starting position.
  • the chamber 38 is in this case filled via the throttle 43 again.
  • the piston 39 moves so far that the sealing seat 44 is reached and the injection is terminated.
  • the throttle 43 creates a pressure loss between the present in the blind hole 42 fuel and the chamber 38.
  • a defined throttle flow is exceeded, the piston 39 moves against the spring force in the direction of the lower sealing seat 44 and thus ends the injection.
  • a single high-pressure line 8 is provided which extends through the holding body 5.
  • the fuel passing through the flow restrictor 26 passes directly into the high-pressure line 8 via a bore section 48.
  • a further high-pressure line 20 is arranged, which is designed as a resonator and communicates with the fuel supply via a resonator throttle 21.
  • the two high-pressure lines 8 and 20 are by a in the Flow restrictor 26 trained Bohrungsverschneidung 45 fueled.
  • the sealing of the flow restrictor 26 to the holding body 5 can also be done via a cone seal 46 in topfeed injectors.
  • the pins 34 can be omitted for the rotation.
  • the conical sealing surfaces forming the conical seal 46 in this case delimit a hollow space 47 into which, on the one hand, the outlet 37 and, on the other hand, the high-pressure lines 8 and 20 open.
  • Fig. 5 it is a sidefeed injector, in which the fuel is fed via the inlet bore 24 from the holding body 5 via the flow restrictor 26 into the high-pressure accumulator 6.
  • the inlet bore 24 opens in this case via a storage throttle 49 in the high-pressure accumulator. 6

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP13715200.5A 2012-04-10 2013-04-08 Injektor eines modularen common-rail-kraftstoffeinspritzsystems mit durchflussbegrenzer Active EP2836696B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA424/2012A AT512277B1 (de) 2012-04-10 2012-04-10 Injektor eines modularen Common-Rail-Kraftstoffeinspritzsystems mit Durchflussbegrenzer
PCT/EP2013/057268 WO2013153010A1 (de) 2012-04-10 2013-04-08 Injektor eines modularen common-rail-kraftstoffeinspritzsystems mit durchflussbegrenzer

Publications (2)

Publication Number Publication Date
EP2836696A1 EP2836696A1 (de) 2015-02-18
EP2836696B1 true EP2836696B1 (de) 2016-10-19

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Application Number Title Priority Date Filing Date
EP13715200.5A Active EP2836696B1 (de) 2012-04-10 2013-04-08 Injektor eines modularen common-rail-kraftstoffeinspritzsystems mit durchflussbegrenzer

Country Status (5)

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EP (1) EP2836696B1 (ja)
JP (1) JP5936764B2 (ja)
KR (1) KR102049218B1 (ja)
AT (1) AT512277B1 (ja)
WO (1) WO2013153010A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013013234A1 (de) * 2013-08-08 2015-02-12 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage
CN112761837A (zh) * 2021-01-25 2021-05-07 哈尔滨工程大学 模块化增压式可变喷油的超高压柴油机共轨燃油系统
CN114151248B (zh) * 2021-11-19 2023-10-13 哈尔滨工程大学 液氨直冷-柴油双燃料一体化混合动力系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19860476A1 (de) * 1998-12-28 2000-07-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage
DE10210282A1 (de) * 2002-03-08 2003-09-25 Bosch Gmbh Robert Vorrichtung zum Einspritzen von Kraftstoff an stationären Verbrennungskraftmaschinen
GB0508665D0 (en) * 2005-04-28 2005-06-08 Man B & W Diesel Ltd Fuel injector
DE102005056133A1 (de) 2005-11-23 2007-05-24 L'orange Gmbh Einspritzinjektor
DE102007025050B3 (de) * 2007-05-29 2008-10-16 L'orange Gmbh Hochdruck-Einspritzinjektor für Brennkraftmaschinen mit einer knicklaststeigernden Steuerstangenabstützung über unter Hochdruck stehendem Kraftstoff
WO2009033304A1 (de) * 2007-09-13 2009-03-19 Ganser-Hydromag Ag Brennstoffeinspritzvorrichtung

Also Published As

Publication number Publication date
KR102049218B1 (ko) 2020-01-08
WO2013153010A1 (de) 2013-10-17
JP2015512493A (ja) 2015-04-27
EP2836696A1 (de) 2015-02-18
JP5936764B2 (ja) 2016-06-22
AT512277B1 (de) 2013-07-15
AT512277A4 (de) 2013-07-15
KR20140147100A (ko) 2014-12-29

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