EP3014100A1 - Soupape de distribution - Google Patents

Soupape de distribution

Info

Publication number
EP3014100A1
EP3014100A1 EP14721358.1A EP14721358A EP3014100A1 EP 3014100 A1 EP3014100 A1 EP 3014100A1 EP 14721358 A EP14721358 A EP 14721358A EP 3014100 A1 EP3014100 A1 EP 3014100A1
Authority
EP
European Patent Office
Prior art keywords
outflow opening
control valve
valve
slot
opening
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
EP14721358.1A
Other languages
German (de)
English (en)
Other versions
EP3014100B1 (fr
Inventor
Dominik Kuhnke
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 EP3014100A1 publication Critical patent/EP3014100A1/fr
Application granted granted Critical
Publication of EP3014100B1 publication Critical patent/EP3014100B1/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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle

Definitions

  • the invention relates to a control valve for a fuel injector, in particular a common rail fuel injector, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel! Njektor with such a control valve.
  • Control valves of the aforementioned type are regularly used in fuel injectors, which have a hubbewegliche nozzle needle for releasing and closing at least one injection port.
  • the control valve serves to control the lifting movement of the nozzle needle. Opens the control valve, a control chamber is relieved, so that acting in the closing direction of the nozzle needle control pressure decreases in the control chamber and opens the nozzle needle.
  • the actuation of the control valve is generally carried out by means of an actuator, such as a Magnetaktors or a
  • German Offenlegungsschrift DE 10 2006 049 050 A1 exemplifies a fuel injector with a control valve for actuating an injection valve member which releases or closes off at least one injection opening.
  • the control valve comprises a liftable valve piston, which cooperates sealingly with a valve seat designed as a flat seat. If the valve piston is sealingly seated on the flat seat, a control pressure which acts on the injection valve member in the closing direction builds up in the control chamber.
  • the valve piston Upon actuation of the control valve by means of an electromagnet, the valve piston lifts off the valve seat and a connection of the control chamber is made with a low pressure area. As a result, the control pressure in the control chamber and thus the injection valve member acting in the closing direction decreases Force.
  • the injection valve member opens and releases the at least one injection opening in this way.
  • the provision of the valve piston takes place by means of the spring force of a spring after completion of the energization of the electromagnet. This in turn results in the increase of the control pressure in the control chamber, so that also the injection valve member is returned to its sealing seat and the at least one injection port closes again.
  • a fast-switching control valve is advantageous in order to bring about rapid relief of the control chamber.
  • the advantage here is a reduced stroke of the liftable closing element of the control valve.
  • a sufficiently large outflow cross-section must be ensured.
  • the diameter of a discharge opening located within the valve seat can be increased.
  • this also increases the valve closing element formed on the surface, which comes to lie within the diameter of the valve seat, and is acted upon in the closed position of the control valve by the control pressure of the control chamber.
  • the result is an increase in the force acting on the valve closing element in the opening direction hydraulic force. This can be counteracted by the spring force of a spring is increased, which acts on the valve closing element in the closing direction. To open the valve but then larger magnetic forces are required, which in turn adversely affects the switching time of the control valve.
  • the present invention has the object to provide a fast-switching control valve for a fuel injector, which has at least one optimized in terms of reduced switching forces and / or low strokes discharge opening. Furthermore, a control valve with an increased life is to be provided.
  • the proposed control valve comprises a valve piece with a discharge opening formed inside a valve seat designed as a flat seat, and a lift-movable valve closing element sealingly cooperating with the valve seat.
  • the outflow opening is slit-shaped and has a length L which is greater than a width B.
  • the length L corresponds essentially to a diameter D or a radius R of a circular area within which the outflow opening and at least one further outflow opening connected to the outflow opening and / or separate from the outflow opening are arranged.
  • the slot-shaped outlet opening has in comparison to a circular
  • Outflow opening receiving circular surface form at least one further outflow opening.
  • the at least one further outflow opening can be connected to the slot-like outflow opening or formed as a separate outflow opening. It has been found that the load on the valve piece can be reduced by this measure. This in turn leads to an increase in the service life of the control valve.
  • the at least one further outflow opening is likewise slot-shaped and has a longitudinal axis A ', which is inclined relative to a longitudinal axis A of the first slot-shaped outflow opening.
  • Outflow openings arranged in a cross or star shape.
  • the arrangement may be such that two or more slit-like outflow openings intersect.
  • the strength-increasing effect is achieved by avoiding a voltage-generating widening of the slit-shaped outlet openings, since in the vicinity of other pressure-loaded slots by the expansion of a supporting effect on the highly loaded notch radius is achieved.
  • the effect can already be detected by arranging a further slot-like outflow opening within the circular area predetermined by the first outflow opening.
  • the at least one further outflow opening is arranged at one end of the slot-like outflow opening within the circular area.
  • the further discharge opening arranged at the end leads to an enlargement of the notch radius, so that a stress relief is achieved.
  • Outflow opening may for example be circular and have a diameter d which is greater than the width B of the slot-like outflow opening.
  • diameter d it should be noted that the ratio surface / outlet circumference is not significantly deteriorated to the above-mentioned advantages of a slit-shaped outlet opening relative to a circular
  • the further outflow opening arranged at one end of the slot-shaped outflow opening can be slot-shaped and have an arcuate course. Also by this measure, a stress relief is achieved by increasing the notch radius.
  • the further outflow opening has an optimized geometry.
  • the arcuate course ensures the arrangement of the further slot-shaped outflow opening within the specified circular area.
  • the effect of the voltage reduction is here in particular in the approximation to the voltage-ideal circular shape with internal pressure.
  • An arcuate course of the further outflow opening, which is offset slightly inwards relative to the circular shape, proves to be particularly advantageous with regard to the avoidance of notch stresses.
  • the arcuate course of the further outflow opening follows the shape of an ellipse with two half-axes a, b, wherein the shorter half-axis a with the length L of the slit-like outflow opening defining the circular area coincides.
  • the approximate circular shape thus an approximately hydrostatic stress state, so that stresses occur substantially only radially outward of the arcuate course, where they are much smaller due to the large radius.
  • the half-axis a is less than a quarter of the length L of the slot-like outflow opening, at the end of which it is arranged. By this measure, a sufficient mechanical strength of the valve piece is further ensured.
  • the half-axis ratio a / b is 0.8 to 0.9. This ensures that in the case of a plurality of slit-shaped outflow openings, which are each arranged at one end of a slit-shaped radially extending outflow opening and have a curved course, a sufficient web width remains in order not to jeopardize the mechanical strength of the valve piece.
  • valve seat formed as a flat seat is released and is formed by at least one web, which follows an outer contour of an outflow opening.
  • the discharge opening is therefore limited by the web. Due to the release, the fluid exiting via the outflow openings can flow off almost without pressure. As a result, an additional opening force acting on the valve closing element is avoided.
  • the sealing surface of the valve seat is reduced, so that an improved sealing effect is achieved.
  • a fuel injector is proposed with a control valve according to the invention also.
  • the control valve is preferably used to control the lifting movement of a nozzle needle of the fuel injector.
  • FIG. 1 shows a longitudinal section through a fuel injector with a control valve according to the invention
  • FIG. 2 shows a plan view of a valve piece of a control valve according to the invention according to a first preferred embodiment of the invention
  • FIG. 3 is a plan view of a valve piece of a control valve according to the invention according to a second preferred embodiment of the invention
  • FIG. 4 shows a plan view of a valve piece of a control valve according to the invention according to a third preferred embodiment of the invention
  • FIG. 5 is a plan view of a valve piece of a control valve according to the invention according to a fourth preferred embodiment of the invention.
  • FIG. 6 shows a plan view of a valve piece of a control valve according to the invention according to a fifth preferred embodiment of the invention
  • FIG. 7 shows a plan view of a valve piece of a control valve according to the invention according to a sixth preferred embodiment of the invention
  • FIG. 8 is an enlarged view of the geometry of the outflow openings of the embodiment of FIG. 6, FIG.
  • FIG. 9 shows a further plan view of the valve piece of FIG. 6, showing the stresses occurring in the valve piece, FIG.
  • FIG. 10 shows a perspective sectional view of the valve piece of FIG. 6,
  • FIG 11 shows a longitudinal section through a valve piece of a control valve according to the invention
  • Figure 12 is a partial plan view of a valve piece of a control valve according to the invention.
  • the fuel injector shown in Figure 1 has a nozzle body 25 and a holding body 26 which are axially braced by means of a clamping nut, not shown.
  • the nozzle body 25 and the holding body 26 are penetrated by a high-pressure bore 24, in which a nozzle needle 20 for releasing or closing of injection openings 27 is received in a liftable manner.
  • the high-pressure bore 24 is connected via a feed line 28 to a high-pressure accumulator 29, via which the high-pressure bore 24 is supplied under high pressure fuel.
  • the high-pressure bore 24 is delimited by a valve piece 1, which is inserted into the holding body 26, of a control valve for controlling the lifting movement of the nozzle needle 20.
  • the valve piece 1 seals the high-pressure bore 24 from a low-pressure chamber 10, which is formed within a valve body 11 of the control valve.
  • a low-pressure chamber 10 Via a bore 15 of the valve body 11, in which a valve closing element 4 of the control valve is received liftable, and a receiving space 19, in which a cooperating with an electromagnet 13 for actuating the control valve armature 12, the low-pressure chamber 10 is connected to a return line 30 ,
  • a sealing sleeve 22 is supported, in which one end of the nozzle needle 20 is received in such a way that a control chamber 16 is formed, which is connected via an inlet throttle 18 with the high-pressure bore 24.
  • a control chamber 16 In the closed position of the control valve therefore also prevails in the control chamber 16 high pressure, which exerts an acting on an end face 21 of the nozzle needle 20 in the closing direction compressive force.
  • the nozzle needle 20 is acted upon by the spring force of a spring 23 in the closing direction.
  • a relief of the control chamber 16 is effected, so that the force acting on the end face 21 of the nozzle needle 20 closing pressure is reduced and the nozzle needle 20 lifts from its seat.
  • the nozzle needle 20 releases the injection openings 27 in this way.
  • the discharge of the control room 16 is opened by opening the
  • Control valve causes, so that the control chamber 16 is connected to the low-pressure chamber 10.
  • the electromagnet 13 is energized. About the magnetic force of the electromagnet 13 of the arranged in the receiving space 19 armature 12 which is fixedly connected to the valve closing element 4 of the control valve, pulled in the direction of the electromagnet 13, so that the valve closing element 4 lifts from a formed in the valve piece 1 valve seat 2 and an outflow opening 3 releases, via which the required to relieve the control chamber 16 connection with the low-pressure chamber 10 is made.
  • the energization of the electromagnet 13 is stopped. The armature 12 and the valve closing element 4 are then placed back on the spring force of a spring 14 to its original position. In the closed position of the control valve, the control chamber 16 is filled via the inlet throttle 18 again with fuel, so that the pressure in the control chamber 16 increases again.
  • the outlet opening 3 is presently slit-shaped and serves at the same time as an outlet throttle 17. It lies within the valve seat 2 designed as a flat seat.
  • the valve closure element 4 has a circular sealing surface 8, which is flat according to the valve seat 2.
  • At least one further outflow opening 6, 6 ' is provided according to the invention, which is formed within a circular area 5, which is defined by the slot-shaped outflow opening 3 and thus also comes to lie within the sealing surface 8 of the valve closing element 4.
  • the at least one further outflow opening 6, 6 'voltages in the valve piece 1 are counteracted, so that the load capacity of the valve piece 1 increases.
  • preferred embodiments of the further outflow openings 6, 6 'in each case in combination with a slot-shaped outflow opening 3 are shown.
  • a first preferred embodiment is shown in FIG. It shows a usable in the fuel injector according to the figure 1 valve piece 1 of a control valve according to the invention in plan view.
  • the further outflow opening 6 is here also slit-shaped and forms with the discharge opening 3 a cross, which comes to rest within the circular area 5, which by the length L of
  • Outflow opening 3 is defined. Because the length L corresponds to the diameter D of the circular surface 5.
  • Outflow openings 3, 6 are orthogonal to each other, so that the two
  • FIG. 2 A modification of the embodiment of FIG. 2 is shown in FIG.
  • a circular outflow opening 6 is arranged at the ends of the two slot-shaped outflow openings 3, 6, whose diameter d is greater than the width B of the slot-shaped outflow openings 3, 6 is selected.
  • Outflow openings 6 cause a relief of the valve piece 1, as notch stress is counteracted.
  • FIG. 1 A further, particularly preferred embodiment is shown in FIG.
  • the slot-shaped outflow opening 3 is combined with each end arranged C-shaped outflow openings 6.
  • the C-shaped outflow openings 6 also form slots, which also extend arcuately.
  • the arch form follows the shape of an ellipse, which is defined by the semi-axes a, b (see Figure 8).
  • the shorter half-axis a coincides with the length L of the slot-shaped outflow opening 3, where a is less than a quarter of the length L.
  • the ratio of the semi-axes a / b in the present case is 0.8. This has the consequence that the arcuate course of the C-shaped outflow openings 6 is offset in relation to a circle 5 delimiting the circular line inwards. This measure has a strengthening effect, because stresses occur essentially on the outside of the C-shaped
  • FIG. 6 A modification of the embodiment of FIG. 6 is shown in FIG.
  • the length L of the slot-shaped outflow opening 3 here corresponds to the radius R of the circular surface 5.
  • Respectively at the same angular distance from each other two further slot-shaped outflow openings 6 are arranged, so that the outflow openings 3, 6 give a star shape.
  • Each of the outflow openings 3, 6 has at its end a C-shaped
  • FIG. 10 shows an advantageous embodiment of the valve seat 2 which can be combined with all of the embodiments of the outflow openings 3, 6, 6 'described above, although the illustration relates to an embodiment according to FIG.
  • the valve seat 2 is formed here by webs 7, which the

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape de distribution destinée à un injecteur de carburant, notamment un injecteur de carburant pour rampe de distribution commune, comprenant une soupape (1), munie d'un orifice d'écoulement (3) formé à l'intérieur d'un siège de soupape (2) configuré sous forme de siège plat, ainsi qu'un élément de fermeture de soupape (4) pouvant décrie un mouvement de va-et-vient et coopérant avec le siège de soupape (2) afin d'établir l'étanchéité. Selon l'invention, l'orifice d'écoulement (3) est configuré en forme de fente et présente une longueur (L) qui est supérieure à une largeur (B). La longueur (L) correspond sensiblement à un diamètre (D) ou à un rayon (R) d'une surface circulaire (5) à l'intérieur de laquelle sont disposés l'orifice d'écoulement (3) et au moins un orifice d'écoulement supplémentaire (6, 6') relié à l'orifice d'écoulement (3) et/ou séparé de l'orifice d'écoulement (3). L'invention concerne en outre un injecteur de carburant équipé d'une telle soupape de distribution.
EP14721358.1A 2013-06-25 2014-04-30 Soupape de distribution Not-in-force EP3014100B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310212140 DE102013212140A1 (de) 2013-06-25 2013-06-25 Steuerventil
PCT/EP2014/058919 WO2014206606A1 (fr) 2013-06-25 2014-04-30 Soupape de distribution

Publications (2)

Publication Number Publication Date
EP3014100A1 true EP3014100A1 (fr) 2016-05-04
EP3014100B1 EP3014100B1 (fr) 2017-07-19

Family

ID=50639520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14721358.1A Not-in-force EP3014100B1 (fr) 2013-06-25 2014-04-30 Soupape de distribution

Country Status (4)

Country Link
EP (1) EP3014100B1 (fr)
CN (1) CN105492755B (fr)
DE (1) DE102013212140A1 (fr)
WO (1) WO2014206606A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10310597B2 (en) 2013-09-03 2019-06-04 Tobii Ab Portable eye tracking device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015111813B4 (de) * 2015-07-21 2017-03-02 Kendrion (Villingen) Gmbh Sitzventil
CN114790957B (zh) * 2022-04-29 2023-11-21 中国北方发动机研究所(天津) 一种滑阀式共轨喷油器

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US3731880A (en) * 1971-10-08 1973-05-08 Gen Motors Corp Ball valve electromagnetic fuel injector
DE3878599T2 (de) * 1987-06-26 1993-09-23 Hitachi Automotive Eng Elektromagnetisches kraftstoffeinspritzventil.
EP0745764B1 (fr) * 1995-06-02 2001-03-21 Ganser-Hydromag Ag Soupape d'injection de combustible pour moteurs à combustion interne
JP3584554B2 (ja) * 1995-07-26 2004-11-04 株式会社デンソー 蓄圧式燃料噴射装置
JP3719468B2 (ja) * 1996-09-02 2005-11-24 株式会社デンソー 蓄圧式燃料噴射装置
ITTO20010970A1 (it) * 2001-10-12 2003-04-12 Fiat Ricerche Inettore di combustibile per un motore a combustione interna.
DE102006049050A1 (de) 2006-10-18 2008-04-30 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff
DE102008005532A1 (de) * 2008-01-22 2009-07-23 Robert Bosch Gmbh Kraftstoffinjektor, dessen Steuerventilelement einen Stützbereich aufweist

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10310597B2 (en) 2013-09-03 2019-06-04 Tobii Ab Portable eye tracking device

Also Published As

Publication number Publication date
WO2014206606A1 (fr) 2014-12-31
CN105492755B (zh) 2018-08-14
EP3014100B1 (fr) 2017-07-19
CN105492755A (zh) 2016-04-13
DE102013212140A1 (de) 2015-01-08

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