EP2016276A1 - Injecteur de carburant avec un circuit de reflux optimise - Google Patents

Injecteur de carburant avec un circuit de reflux optimise

Info

Publication number
EP2016276A1
EP2016276A1 EP07726725A EP07726725A EP2016276A1 EP 2016276 A1 EP2016276 A1 EP 2016276A1 EP 07726725 A EP07726725 A EP 07726725A EP 07726725 A EP07726725 A EP 07726725A EP 2016276 A1 EP2016276 A1 EP 2016276A1
Authority
EP
European Patent Office
Prior art keywords
armature
anchor bolt
anchor
fuel injector
guide
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
Application number
EP07726725A
Other languages
German (de)
English (en)
Other versions
EP2016276B1 (fr
Inventor
Holger Rapp
Friedrich Boecking
Friedrich Howey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2016276A1 publication Critical patent/EP2016276A1/fr
Application granted granted Critical
Publication of EP2016276B1 publication Critical patent/EP2016276B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • 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
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • DE 196 50 865 Al relates to a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail injection system. Via the fuel pressure in the control chamber, a stroke movement of a valve piston is controlled, with which an injection opening of the injection valve is opened or closed.
  • the solenoid valve comprises an electromagnet, a movable armature and a valve member moved with the armature and acted upon by a valve closing spring in the closing direction, which cooperates with the valve seat of the solenoid valve and thus controls the fuel discharge from the control chamber.
  • valve spring exerting a closing force on the anchor bolt introduces lateral force components into the assembly of anchor plate and anchor bolt. Due to the guiding play between the armature guide and the anchor bolt, this leads to a tilting of the anchor bolt in the armature guide. In the case of a strong lateral force, this tilting can also be present in the upper position of the anchor bolt when the electromagnet is energized, since an anchor bolt stop is provided on one side. can lie. This part of the set armature stroke, ie the movement of the anchor bolt during operation, not fully utilized. This leads to a scattering of the injection quantity of fuel into the combustion chamber of an internal combustion engine.
  • a restriction of the guide play in turn means that the anchor bolt does not maintain a consistent position in ballistic operation, but takes a different position from injection to injection. This is accompanied by changing states of friction between the anchor bolt and the armature guide, and thus the dispersion of the injected fuel quantity arises.
  • the armature plate of the armature assembly is guided, which is attracted by the solenoid of the solenoid valve, with which the fuel injector is actuated. While the outflow valve, ie the valve ball, is open, the amount flowing out of the control chamber (control quantity) flows through the armature assembly in the direction of the low-pressure side return.
  • the outflow valve ie the valve ball
  • the amount flowing out of the control chamber flows through the armature assembly in the direction of the low-pressure side return.
  • at least two holes are provided on the armature guide.
  • the solid surface is divided by a grinding operation in three wing-shaped sections. The control amount flows after passage of the armature plate through a gap between a locking sleeve and the magnetic core.
  • the amount of control is not constant due to pressure oscillations in the injector.
  • the amount of control that flows through the armature assembly is present as an air-liquid mixture. This mixture is in contact with the underside of the anchor plate.
  • the pressure of the air-liquid mixture acts on the armature plate in the opening direction and thus influences their movement. This leads to variations in the amount of injection between injections in a fuel injector.
  • the pressure fluctuations and the changing states of the medium have a very negative effect. Disclosure of the invention
  • the object of the invention is to guide the control quantity discharged from the control chamber of the fuel injector into the low-pressure-side return such that it does not interact with the armature plate of the armature assembly.
  • the armature assembly of anchor bolt, anchor plate and armature guide so that within the armature assembly, such. B. within the anchor guide and / or within the anchor plate, in each case a cross section over the entire length of the anchor bolt or the anchor guide is formed.
  • the control quantity to be diverted from the control chamber into the low-pressure side return can flow through this cross section in the armature assembly, without influencing the movement of the armature plate by changing pressures.
  • the control amount previously flows to the low-pressure side return omitted, representing a saved in the series production of fuel injectors manufacturing step and causes the tax amount only within the anchor parts can flow instead of as previously by the anchor plate.
  • the dynamics and the vibration behavior, in particular the anchor plate can be significantly reduced.
  • the anchor bolt or the armature guide and the armature plate of an armature assembly can be provided with extending grooves or similar recesses in the axial direction, so that the effluent from the outlet throttle of the control chamber flow in the interior of the armature parts to low-pressure side return flows.
  • the amount of tax can flow through the horseshoe-shaped shim already fitted as standard with which the upper position of the anchor plate is fixed to the anchor bolt.
  • the locking sleeve surrounding the locking sleeve is changed, for example, through openings such that the taxed control amount can also pass through the locking sleeve.
  • the anchor guide can be redesigned such that the anchor bolt is guided by the anchor guide inside and the anchor plate is guided on the armature guide outside.
  • the shape of the recesses z. B. can be made as grooves, is arbitrary. Particularly advantageous in terms of the leadership of the anchor bolt such recesses or grooves have been found that extend helically on the anchor bolt. With regard to manufacturing optimization, the anchor bolt could be provided with a triple flattening and three holes. In this way, a few burrs can be achieved during the grinding of the anchor bolt of the anchor assembly, which therefore significantly shortens the machining.
  • FIG. 1 shows a fuel injector according to the prior art, an anchor plate, an armature guide and an anchor bolt comprising and actuated by a solenoid valve,
  • FIG. 2 shows the armature assembly proposed according to the invention with a groove formed on the armature bolt 10 and extending in the axial direction of the armature bolt,
  • FIG. 3 shows a variant of the armature assembly with groove-shaped recesses in the anchor bolt in the anchor plate and the armature guide
  • Figures 4.1, 4.2 and 4.3 a variant of the anchor bolt according to the illustration in Figure 3 with three flats on the circumference of the anchor bolt and Figure 5 shows a variant of the invention proposed anchor assembly with an anchor guide on the outside guided anchor plate and at least one extending in the axial direction of the anchor bolt recess.
  • Figure 1 is a fuel injector according to the prior art can be seen, which is actuated by a solenoid valve and having a multi-part armature assembly.
  • a fuel injector 10 as shown in Figure 1 comprises an injector body 12 in which a solenoid valve 14 is received. From the solenoid valve 14, a magnetic core 20 and the magnetic core 20 enclosed by the magnetic coil 22 are shown in the illustration of Figure 1.
  • the solenoid coil 22 of the solenoid valve 14 is energized via not shown in Figure 1 electrical connections.
  • an armature assembly 16 is arranged, which comprises an armature guide 30, an anchor bolt 32 and an anchor plate 34 and is formed in several parts.
  • An anchor spring 36 which biases the anchor plate 34 against the anchor bolt 32, is located between the armature plate 34, which is displaceably mounted on the anchor bolt 32, and a lower stop on the armature guide 30.
  • a closing spring 18 is located at the head of the anchor bolt 32 at.
  • a dial 26 which is enclosed by a hat-shaped locking sleeve 28.
  • the armature guide 30 of the armature assembly 16 as shown in Figure 1 is attached via a clamping screw 38 in the injector body 12 of the fuel injector 10.
  • a classified shim 42 Below the armature guide 30 is a classified shim 42.
  • the armature guide in the injector body 12 against a Einspritzventil- member guide 58, which also in the injector body 12 of the fuel injector 10 is included, biased.
  • bores 40 via which flows from a control chamber 52 of the fuel injector 10 control amount flows to a low-pressure side return.
  • the low-pressure side return is located in the embodiment variant shown in Figure 1 according to the prior art above the closing spring 18 which is received in the through hole 24 of the magnetic core 20 of the solenoid valve 14.
  • the here formed spherical closure member 46 is placed in its closing seat 48 and closes an outlet throttle 50 of the control chamber 52.
  • the control chamber 52 is acted upon by an inlet throttle 54 standing under high system pressure fuel.
  • the fuel under system pressure flows to the injector body 12 of the fuel injector 10 via a high-pressure port, via which the fuel injector 10 as shown in Figure 1 with a high-pressure accumulator chamber of a high-pressure injection system, such as.
  • a high-pressure injection system such as.
  • the ball-shaped closing element 46 is placed in its closing seat 48.
  • the control chamber 52 is subjected to system pressure, so that the injection needle member 56, which is shown only partially in FIG. 1, preferably in the form of a needle, remains seated, ie. H.
  • the injection needle member 56 which is shown only partially in FIG. 1, preferably in the form of a needle, remains seated, ie. H.
  • the injection openings for injecting fuel into the combustion chamber of the internal combustion engine remain closed.
  • the control quantity flowing out of the control chamber 52 when the closing element 46 is open represents a liquid-air mixture which, in the embodiment according to FIG. 1, flows through the bores 40 in the armature guide 30 after passage of the classified adjusting disk 42 and flows around the armature plate 34.
  • the diverted control amount flows through a gap between the locking sleeve 28 and the magnetic core 20 to the above the closing spring 18 arranged low-pressure side return to.
  • the air-liquid mixture is in contact with the underside of the armature plate 34 and acts during the closing movement of the armature assembly 16 on the armature plate 34 in the opening direction and thus influences their movement.
  • this leads to variations between the individual injections of the fuel injector 10. Occurring pressure fluctuations and the changing states of the medium, d. H. the composition of the air-liquid mixture of the control amount, have a negative effect.
  • FIG. 2 shows a first embodiment variant of an armature assembly proposed according to the invention.
  • an armature assembly 70 is proposed which has an armature pin 72, which is accommodated in an armature guide 78 on the one hand, and on which, on the other hand, an armature plate 80 is slidably received on its peripheral surface 73.
  • the anchor bolt 72 of the armature assembly 70 is characterized in that on the one hand, on its side facing the closing element 46 (cf. illustration according to FIG. 1), it has a radial passage 74, which merges into an axial passage 76, which is formed in an axial length 82.
  • the axial length 82 of the axial channel 76 is dimensioned so that it extends from the underside of the armature guide 78 to the top of the anchor plate 80.
  • the radial channel 74 and the axial channel 76 may, for. B. are designed as axial grooves on the circumference 73 of the anchor bolt 72.
  • FIG. 3 shows a further embodiment variant of the armature assembly 70 proposed according to the invention for use in a fuel injector.
  • At least one axial channel 76 extending in the axial direction and in the axial length 82 is formed on the circumference 73 of the armature pin 72, which is hydraulically connected to a radial channel 74 on the underside of the armature pin 72 so that the control amount can flow through the interior of the armature assembly 70 in the direction of the low-pressure side return.
  • At the at least one axial channel 76 on the periphery 73 of the anchor bolt 72 is formed, in the embodiment variant of the armature assembly 70 shown in Figure 3, another axial channel 86 within a bore 84 of the armature plate 80. Furthermore, at least one axial channel 90 extends within a bore 88 of the armature guide 78th
  • a plurality of axial channels 76 formed in an axial length 82 can be formed on the circumference 73 of the anchor bolt 72, and a plurality of axial channels 86 passing through the anchor plate 80 can also be embodied within the bore 84 of the anchor plate 80.
  • armature guide 78, in the bore 88 also a plurality of axial channels 90 may be formed.
  • a plurality of radial channels 74 are preferably formed on the underside of the anchor bolt 72.
  • the control quantity emerging from the outlet throttle 50 of the control chamber 52 enters a cavity surrounding the closing element guide 44 and, when using the armature assembly 70 proposed according to the invention, can slide directly into the locking element guide 44 in the anchor bolt 72 trained radial passages 74 occur.
  • FIGS. 4.1, 4.2 and 4.3 show a design variant of an anchor bolt optimized in terms of production engineering.
  • At least one flattening 102 is formed on the circumference 73 of an anchor bolt 100.
  • Below the flattening is at least one bore 104, which passes through the lower end face of the anchor bolt 100 as shown in Figure 4.1. If the anchor bolt 100 is used with flattening in the context of the armature assembly 70 shown in FIGS.
  • the control quantity flowing out of the control chamber 52 via the drain throttle 50 flows via the bores 104 along the at least one circumference 73 of the anchor bolt 100 formed flattening 102 in the direction of the head of the anchor bolt 100 and passes the illustrated in Figure 1, horseshoe-shaped shim 26 and thus the locking sleeve 28 which is provided with openings, in the direction of the low pressure side provided return of the fuel injector 10th
  • FIG. 4.2 shows a view of the at least one flattening 102 on the anchor bolt 100 with flattening. From the illustration according to FIG. 4.2, it can be seen that the holes 104 in the lower stop surface of the anchor bolt 100 can also be formed offset laterally relative to the at least one flattening 102.
  • the illustration according to FIG. 4.3 shows a view of a section through the anchor bolt 100 shown in FIG. 4.1 with a flattening. It can be seen from the illustration according to FIG. 4.3 that a number of holes 104 on the anchor bolt 100 corresponding to the number of flats 108, 110 and 112 formed on the circumference 73 of the anchor bolt 100 are executed.
  • a bore 104 lies below one of the first flattening 108, second flattening 110 and third flattening 112 provided with the flattening 73 of the anchor bolt 100.
  • a bore pattern 106 results the individual holes formed in the lower stop of the anchor bolt 100 with flattening 104 are offset from one another at an angle of 120 °.
  • the embodiment of the anchor bolt 100 with flattenings shown in FIGS. 4.1, 4.2 and 4.3 ensures that the fuel is guided directly into the interior of the anchor assembly 70, along the at least one flattening 102 and flattened on the circumference 73 of the anchor bolt 100 the resulting gap flows to the armature guide 78 and the armature plate 80 in the direction of the low-pressure side return.
  • the embodiment variant of the anchor bolt 100 with at least one flattening illustrated in FIGS. 4.1, 4.2 and 4.3 is characterized by a simple production in which at least one flattening 102 in the circumference 73 of the anchor bolt 100 is involved during the machining of the anchor bolt 100 in the turning stage Flattening can be performed. In the subsequent grinding machining little burrs occur in the anchor bolt 100 illustrated in FIGS. 4.1, 4.2 and 4.3, which simplifies the further processing or reworking of the anchor bolt 100 with flattening in subsequent processing steps.
  • FIG. 5 shows a further embodiment variant of the armature assembly 70 proposed according to the invention.
  • the armature guide 78 is designed with an elongated neck 114. While the anchor bolt 72, on whose circumference 73 at least one axial channel 76 is formed in the axial length 82, is guided within the armature guide 78, an externally guided armature plate 118 on the outer circumference 116 of the extended neck 114 of FIG Anchor guide 78 out.
  • the gap between the anchor plate 80 and the anchor bolt 72 according to the embodiment in Figure 3 is no longer present.
  • the gap between the anchor plate 80 and the outer periphery 73 of the anchor bolt 72 according to the embodiment in Figure 3 is on the order of about 60 microns. Since this gap no longer exists according to the embodiment variant in FIG.
  • the control quantity can not influence the movement of the externally guided armature plate 118, so that the resulting variations in the injection quantity due to an uneven movement of the armature plate 118 during energization of the armature plate 118 Solenoid coil 22 are again minimized in the embodiment variant of the inventively proposed anchor assembly 70 shown in Figure 5.
  • the entire control quantity flows via the at least one radial channel 54 in the lower stop of the anchor bolt 72 into the axial channel 76 extending in the axial length 82 on the circumference 73 of the anchor bolt 72 and thus completely in the interior of the armature guide 78 in the direction of low-pressure side return 62 (see illustration in FIG 1).
  • the armature assembly 70 proposed in FIGS. 2, 3, 4.1, 4.2, 4.3 and 5 it is ensured that the control quantity diverted to the control chamber 52 of the fuel injector 10 passes through the radial channels 74 and the axial channel 76 at the periphery 73 of the anchor bolt 72 or via the axial channel 86 of the armature plate 80, the axial channel 90 of the armature guide 78 or via the at least one flattening 102 of the anchor bolt 100 can run off with Anfla- tion, without affecting the movement of the armature plate 80 and 118 by changing pressures.
  • the design of the armature assembly 70 proposed according to the invention significantly reduces the dynamics and the vibration behavior of the armature plate 80 or 118.
  • the modification to the fuel injector 10 as shown in Figure 1 is essentially the fact that the insurance sleeve 28, which the shim 26 encloses, is to be provided with openings, so that a flow through the securing sleeve 28 is ensured by the control amount in the direction of the low-pressure side drain 62 in the fuel injector 10.
  • Radial channels 74 which may be formed in the lower region of anchor bolt 72, may be replaced or combined with radial channels running on the underside of anchor plate 80, as shown in FIGS. 2, 3 and 5. It is irrelevant whether the anchor plate 80 is guided on the circumference 73 of the anchor bolt 72 according to the embodiment in Figures 2 and 3 or whether the relative to Anchor bolt 72 movable armature plate 118, as shown in the embodiment variant shown in Figure 5, the neck 114 of the armature guide 78 is guided.
  • the training in radial channels at the bottom of the armature plate 80 and 118 offers manufacturing advantages.

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

L'invention concerne un injecteur de carburant (10) avec une soupape magnétique (14) avec un ensemble structurel de court-circuit (70). Au-dessus de l'ensemble structurel de court-circuit (70), un élément d'amorçage (46) est actionné pour décompresser une chambre de commande (52). Une quantité de commande s'écoulant hors de la chambre de commande (52) s'écoule dans un circuit de reflux côté faible pression (62), l'ensemble structurel de court-circuit (70) étant disposé entre le circuit de reflux côté faible pression (62) et l'élément d'amorçage (46). La quantité de commande pilotée depuis la chambre de commande (52) circule dans l'intérieur de l'ensemble structurel de court-circuit (70).
EP07726725A 2006-05-04 2007-03-09 Injecteur de carburant avec un circuit de reflux optimise Not-in-force EP2016276B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610020691 DE102006020691A1 (de) 2006-05-04 2006-05-04 Kraftstoffinjektor mit optimiertem Rücklauf
PCT/EP2007/052202 WO2007128602A1 (fr) 2006-05-04 2007-03-09 injecteur de carburant avec un circuit de reflux optimisé

Publications (2)

Publication Number Publication Date
EP2016276A1 true EP2016276A1 (fr) 2009-01-21
EP2016276B1 EP2016276B1 (fr) 2010-05-26

Family

ID=38137443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726725A Not-in-force EP2016276B1 (fr) 2006-05-04 2007-03-09 Injecteur de carburant avec un circuit de reflux optimise

Country Status (3)

Country Link
EP (1) EP2016276B1 (fr)
DE (2) DE102006020691A1 (fr)
WO (1) WO2007128602A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026083194A1 (fr) * 2024-10-16 2026-04-23 ロベルト•ボッシュ•ゲゼルシャフト•ミト•ベシュレンクテル•ハフツング Dispositif d'injection de combustible

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9508623D0 (en) * 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
DE19650865A1 (de) * 1996-12-07 1998-06-10 Bosch Gmbh Robert Magnetventil
DE19832826C2 (de) * 1998-07-21 2000-08-17 Bosch Gmbh Robert Montageverfahren für Kraftstoff-Einspritzventil und Vorsteuerventil sowie Kraftstoff-Einspritzventil
EP1612403B1 (fr) * 2004-06-30 2007-01-10 C.R.F. Società Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007128602A1 *

Also Published As

Publication number Publication date
EP2016276B1 (fr) 2010-05-26
DE102006020691A1 (de) 2007-11-08
DE502007003946D1 (de) 2010-07-08
WO2007128602A1 (fr) 2007-11-15

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