EP2171257B1 - Steuerventil für einen kraftstoffinjektor sowie kraftstoffinjektor - Google Patents

Steuerventil für einen kraftstoffinjektor sowie kraftstoffinjektor Download PDF

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Publication number
EP2171257B1
EP2171257B1 EP08760769A EP08760769A EP2171257B1 EP 2171257 B1 EP2171257 B1 EP 2171257B1 EP 08760769 A EP08760769 A EP 08760769A EP 08760769 A EP08760769 A EP 08760769A EP 2171257 B1 EP2171257 B1 EP 2171257B1
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EP
European Patent Office
Prior art keywords
control
control valve
valve seat
sleeve
cone angle
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
EP08760769A
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German (de)
English (en)
French (fr)
Other versions
EP2171257A1 (de
Inventor
Stefan Haug
Nadja Eisenmenger
Hans-Christoph Magel
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 EP2171257A1 publication Critical patent/EP2171257A1/de
Application granted granted Critical
Publication of EP2171257B1 publication Critical patent/EP2171257B1/de
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/0031—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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided

Definitions

  • the invention relates to a control valve for a fuel injector according to the preamble of claim 1 and a fuel injector according to claim 10.
  • the control valve has an adjustable by means of an electromagnetic actuator in the axial direction between a closed position and an open position control sleeve which is guided on a, passing through the control sleeve guide pin.
  • the guide pin is formed integrally with a valve body on which the control valve seat is arranged for the control sleeve.
  • control valve seat is expensive to manufacture due to its poor accessibility and that a comparatively large minimum diameter of the guide pin must not be exceeded for reasons of strength, since the supply of fuel from a control chamber via a valve body provided in the flow channel which is cut perpendicularly inside the guide pin by transverse bores.
  • an optimized control valve is known.
  • This in the axial direction likewise pressure-balanced valve has a control sleeve which encloses a pressure pin, which seals the pressure chamber arranged inside the control sleeve and connected to the control chamber in the axial direction.
  • the pressure pin is not formed integrally with the valve body on which the control valve seat is arranged, but as a separate component of the valve body, which is supported in the axial direction at a spaced from the control valve seat injector component, in particular spring assisted. This allows improved accessibility of the control valve seat and thus a simplified manufacturability. In addition, strength problems are avoided.
  • This slip between the control sleeve and control valve seat leads to increased wear on the control sleeve and the control valve seat and thus to form a pressure step on the control sleeve, which causes an undesirable force acting in the opening direction of the control sleeve force on the control sleeve.
  • the invention has for its object to provide a control valve (servo valve) are minimized in the wear phenomena. Furthermore, the object is to propose a correspondingly optimized fuel injector.
  • the invention is based on the idea of selecting the cone angle of the external truncated-cone-shaped control valve seat so that the stop slip of the sealing surface region of the control sleeve is minimized relative to the control valve seat or, in the optimum case, completely avoided. It has surprisingly been found that when the cone angle of the control valve seat is selected from a value range between about 120 ° and about 170 °, a positive effect with regard to minimizing the stop slip across the length of the control sleeve results.
  • This effect can be attributed to the fact that by a cone angle from a value range between about 120 ° and about 170 °, depending on the dimensions and geometric design of the sealing surface having sealing area the control sleeve must be selected, a radially outwardly acting force component is induced in the sealing region of the control sleeve, which counteracts the Nachinneng faced the sealing area, as this is observed in a flat seat.
  • cone angle is understood to mean the angle that two lateral surface sections (oblique sections) of the control valve seat enclose in a plane receiving the longitudinal central axis of the control valve seat.
  • the cone angle is the doubled angle between the lateral surface of the outer truncated cone-shaped control valve seat and the longitudinal center axis of the control valve seat.
  • control sleeve is guided on its inner circumference and / or on its outer circumference. It can be provided to guide the control sleeve on its inner circumference with the control valve seat having the component piece guide pin, which passes through the control sleeve.
  • a pressure pin is arranged, which is designed as a separate part of the valve body having the control valve seat and which is positioned so that it can take over the leadership of the control sleeve.
  • control sleeve in which in the control sleeve only one at one, of which the control valve seat having valve body, spaced component ab Weighteder pressure pin is provided and the control sleeve is guided on its outer periphery.
  • control sleeve alternatively by means of a piezoelectric actuator or an electromagnetic actuator between its closed position in which it rests on the control valve seat and a spaced from the control valve seat opening position in which the control chamber is hydraulically connected to a low pressure region of the injector is adjustable ,
  • cone angle of the control valve seat must be selected from the value range between about 120 ° and about 170 °. It has been found that cone angles from a value range between 130 ° and 170 ° are to be preferred. Especially preferred are cone angles from a value range between 140 ° and 170 °. In tests, particularly good results were achieved in the combination of a seat diameter (sealing diameter) of 2.5 mm and a cone angle of 140 °. Particularly advantageous is the choice of a cone angle from a range of values between 150 ° and 170 °, preferably from a range of values between 155 ° and 160 ° has been found. In particular, for a seat diameter (sealing diameter) of 1.8 mm, a cone angle of the control valve seat of 160 ° is optimal.
  • the sealing surface which cooperates with the outer cone-shaped control valve seat is formed on an inner cone-shaped end side portion of the control sleeve, the sealing surface so itself is internally cone-shaped. As a result, signs of wear can be further minimized.
  • an embodiment is advantageous in which the inner cone angle of the inner surface of the sealing surface (something) is selected to be greater than the cone angle of the outer frustoconical control valve seat.
  • the angular difference between the inner cone angle and the portion of the control sleeve having the sealing surface is selected from a value range between approximately 1 ° and approximately 10 °.
  • Particularly preferred is an inner cone angle greater by about 2 ° to 9 ° than the cone angle of the control valve seat.
  • Particularly optimized results with regard to the wear and the tightness of the control valve in the closed state were achieved with an angle difference between inner cone angle and cone angle of the control valve seat from a value range between 3 ° and 6 °.
  • control valve as a pressure balanced in the axial direction valve, ie a valve on the control sleeve act in the closed state no directed in the axial direction, resulting adjustment forces.
  • This can be realized in particular by the fact that the sealing surface frontally adjacent to the inner peripheral wall of the control sleeve and extending from this in the radial direction outwards and in the axial direction, ie in the direction of the control valve seat.
  • the seat line with which the control sleeve interacts with the outer truncated-cone-shaped control valve seat adjoins the inner circumference the control sleeve.
  • the inner diameter of the sealing line corresponds to the inner diameter of the control sleeve.
  • the sealing surface having sealing area in the radial direction connects an annular surface, preferably in an imaginary, arranged transversely to the longitudinal extent of the control sleeve level lies. It is within the scope of the development that this, the maximum extent of the sealing surface limiting annular surface with the transversely extending to the longitudinal extent of the control sleeve, imaginary plane includes an angle from a value range between about -20 ° and about + 20 °.
  • the invention also leads to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • This has a designed according to the concept of the invention, preferably in the axial direction pressure compensated control valve with a control sleeve which cooperates with an outer truncated cone-shaped control valve seat having a cone angle from a value range between 120 ° and 170 °.
  • opening the control valve ie by lifting the control sleeve of the control valve seat operatively connected to a one-piece or multi-part injection valve element control chamber is connected to an injector return, so that the fuel pressure in the control chamber drops rapidly and the injection valve element lifts from its valve seat and fuel through at least one Nozzle hole opening can flow into the combustion chamber of the internal combustion engine.
  • control sleeve is operatively connected to an anchor plate, ie integrally with this is formed or, in particular form-fitting, connected thereto, wherein the armature plate cooperates for adjusting the control sleeve with an electromagnetic actuator.
  • Fig. 1 is a common rail injector trained fuel injector with the fuel supply components shown schematically in longitudinal section.
  • the fuel injector comprises a holding body 1 and a nozzle body 2, which are clamped together by a clamping nut 3.
  • a two-part injection valve element 3 is mounted longitudinally displaceable.
  • the injection valve element 3 consists of a Nozzle needle 4, which is arranged longitudinally displaceably in the nozzle body 2 and a control rod 5, which is arranged longitudinally displaceable within the holding body 1.
  • the nozzle needle 4 controls the opening of at least one injection opening 6 by its longitudinal movement.
  • the fuel is supplied to the injection openings 6 from the nozzle chamber 7, which surrounds the nozzle needle 4 and which can be filled with fuel at high pressure via an inlet channel 8. If the nozzle needle 10 moves away from the injection openings 6 and thus moves into its open position, fuel, essentially under rail pressure, is injected from the nozzle chamber 7 via the injection openings 6 into a combustion chamber, not shown in the drawing, of an internal combustion engine. If, however, the nozzle needle 10 is in its closed position, i. in contact with a valve seat, the openings 6 are closed by the nozzle needle 4.
  • the control rod 5 is received in a longitudinal bore 9 within the holder body 1.
  • the control rod 5 is connected via a pressure piece 10 to the nozzle needle 4 within a low pressure chamber 11 which is connected via a channel, not shown, to the injector return, so that the control rod 5 moves synchronously with the nozzle needle 4 in the longitudinal direction.
  • the control rod 5 is surrounded by a closing spring 12, which is supported on the one hand in a paragraph on the holding body 1 and on the other hand on the pressure piece 10, so that by the force of the closing spring 12, the pressure piece 10 in the direction of the nozzle needle 4 and so that the nozzle needle 4 is subjected to force in its closed position.
  • a high-pressure pump 13 For supplying the fuel under high pressure, a high-pressure pump 13 is provided, which compresses the fuel from a reservoir 14 and a high-pressure accumulator 15 (Rail) supplies, in which the fuel is kept under high pressure. Via a high-pressure line 16 and a high-pressure connection 17, which is formed on the fuel injector, the high-pressure fuel is supplied to the fuel injector and injected in the manner described via the injection openings 6 into the combustion chamber of the internal combustion engine.
  • control rod 5 With its end facing away from the nozzle needle 4, the control rod 5 defines a control chamber 18, which is connected via an inlet bore 19 with inlet throttle 20 to the inlet channel 8.
  • the control chamber 18 is connected via a drain passage 21 with outlet throttle 22 to a pressure chamber 23.
  • the pressure chamber 23 is arranged radially within an adjustable in the axial direction of the control sleeve 24 of a control valve 25 (servo valve).
  • the control sleeve 24 acts with an outer truncated cone-shaped control valve seat 27 which is formed on a valve body 28.
  • a pressure pin 29 is arranged, which is designed as a separate component from the valve body 28 and which is supported in the axial direction in the drawing plane upwards on a component, not shown.
  • the pressure pin 29 is used in the embodiment shown to guide the control sleeve 24 in the axial direction. Additionally or alternatively, a guide for the control sleeve 24 may be provided on its outer periphery.
  • control sleeve 24 is integrally formed with an anchor plate 30 which cooperates with an electromagnetic actuator 31, in such a way in that the armature plate 30 and thus the control sleeve 24 are moved upwards in the drawing plane when the electromagnetic actuator 31 is energized so that fuel can flow from the pressure chamber 23 into a low-pressure region 32 of the fuel injector and from there to a return 33, via which one later yet to be explained control amount of fuel is returned to the reservoir 14.
  • the energization of the electromagnetic actuator 31 is interrupted and a control closing spring 34 pushes the control sleeve 24 in the axial direction in the drawing plane down to the control valve seat 27th
  • the electromagnetic actuator 31 of the control valve 35 is energized.
  • the control sleeve 24 lifts from its outer frustoconical control valve seat 27, whereby fuel from the control chamber 18 through the drain passage 21 with outlet throttle 22 and the pressure chamber 23 radially between the lower end of the control sleeve 24 and the control valve seat over in the low pressure region 32 and thus to the return 33rd can flow.
  • the flow cross sections of the outlet throttle 22 and the inlet throttle 20 via which continues to flow fuel into the control chamber 18, so matched to each other that a net outflow (control amount) of fuel in the low pressure region 32 and from there into the return 33 results.
  • the energization of the electromagnetic actuator 31 is interrupted, so that the control sleeve 24 is moved by the control closing spring 34 to its control valve seat 27.
  • the pressure in the control chamber 18 increases rapidly, so that the injection valve element 3 moves downwards onto its valve seat in the drawing plane and thus interrupts the fuel flow through the injection openings 6.
  • a possible embodiment of the seat portion of the control valve 25 is shown enlarged.
  • the frontal sealing portion 35 of the control sleeve 24 with its annular sealing surface 36 which cooperates with the outer truncated cone-shaped control valve seat 27.
  • the cone angle ⁇ of the control valve seat 27 is about 120 ° in the embodiment shown. Preference is given to an even greater design of the cone angle, in particular of about 160 °.
  • the cone angle is formed by the lateral surface 37 of the control valve seat 27, more precisely by two sections of the lateral surface 37 accommodating in a plane receiving the longitudinal central axis L of the control valve seat.
  • the sealing surface 36 which cooperates with the lateral surface 37 on an inner cone-shaped portion 26 with an inner cone angle ⁇ of about 125 ° in this embodiment. It is essential that the inner cone angle ⁇ of the annular sealing surface 36 having portion 26 which is arranged on the axial extension 38, (something) is greater than the cone angle ⁇ of the outer frustoconical control valve seat 27th
  • the sealing surface 36 is arranged on an annular axial extension 38 on the end face of the control sleeve 24, wherein the sealing surface 36 extends directly from the inner circumference of the control sleeve 24 both in the radial and in the axial direction.
  • the axial extension 38 with the sealing surface 36 having inner cone-shaped portion 26 is radially outwardly slightly concave curved in an end face annular surface 39 of the control sleeve, wherein the annular surface 39 is located in a plane perpendicular to the longitudinal central axis L level.
EP08760769A 2007-06-21 2008-06-10 Steuerventil für einen kraftstoffinjektor sowie kraftstoffinjektor Active EP2171257B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007028485 2007-06-21
DE102007044355A DE102007044355A1 (de) 2007-06-21 2007-09-17 Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor
PCT/EP2008/057209 WO2008155260A1 (de) 2007-06-21 2008-06-10 Steuerventil für einen kraftstoffinjektor sowie kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2171257A1 EP2171257A1 (de) 2010-04-07
EP2171257B1 true EP2171257B1 (de) 2012-08-15

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EP08760769A Active EP2171257B1 (de) 2007-06-21 2008-06-10 Steuerventil für einen kraftstoffinjektor sowie kraftstoffinjektor
EP08760855.0A Active EP2171258B1 (de) 2007-06-21 2008-06-11 Steuerventil für ein kraftstoffeinspritzventil

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EP08760855.0A Active EP2171258B1 (de) 2007-06-21 2008-06-11 Steuerventil für ein kraftstoffeinspritzventil

Country Status (6)

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EP (2) EP2171257B1 (ru)
JP (1) JP5345612B2 (ru)
CN (2) CN101688508B (ru)
DE (2) DE102007044357A1 (ru)
RU (2) RU2468244C2 (ru)
WO (2) WO2008155260A1 (ru)

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Publication number Publication date
WO2008155260A1 (de) 2008-12-24
CN101688508B (zh) 2012-03-21
CN101688508A (zh) 2010-03-31
DE102007044355A1 (de) 2008-12-24
DE102007044357A1 (de) 2008-12-24
RU2010101640A (ru) 2011-07-27
EP2171258A1 (de) 2010-04-07
CN101680413B (zh) 2012-10-10
RU2010101642A (ru) 2011-07-27
JP5345612B2 (ja) 2013-11-20
EP2171258B1 (de) 2014-12-17
WO2008155275A1 (de) 2008-12-24
EP2171257A1 (de) 2010-04-07
JP2010530492A (ja) 2010-09-09
RU2468244C2 (ru) 2012-11-27
CN101680413A (zh) 2010-03-24
RU2480616C2 (ru) 2013-04-27

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