WO2016202488A1 - Soupape d'injection de carburant pour moteurs à combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
WO2016202488A1
WO2016202488A1 PCT/EP2016/058881 EP2016058881W WO2016202488A1 WO 2016202488 A1 WO2016202488 A1 WO 2016202488A1 EP 2016058881 W EP2016058881 W EP 2016058881W WO 2016202488 A1 WO2016202488 A1 WO 2016202488A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
chamber
control
seat
control valve
Prior art date
Application number
PCT/EP2016/058881
Other languages
German (de)
English (en)
Inventor
Lars Olems
Siegbert Griesinger
Volker Kroeber
Mario Herrera
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 WO2016202488A1 publication Critical patent/WO2016202488A1/fr

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
    • F02M63/007—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
    • 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
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines, as it finds use for the injection of fuel into combustion chambers of internal combustion engines.
  • the invention is based on a fuel injection valve for internal combustion engines, as is known for example from the published patent application DE 10 2011 078 407 AI.
  • a fuel injection valve for internal combustion engines, as is known for example from the published patent application DE 10 2011 078 407 AI.
  • a fuel injection valve has an injector body with a pressure chamber formed therein, which can be filled with fuel under high pressure.
  • a piston-shaped valve needle is arranged longitudinally displaceable within the injector body, wherein the nozzle needle cooperates with a nozzle seat for opening and closing at least one injection opening, via which the fuel can be injected into a combustion chamber of an internal combustion engine.
  • the control of the longitudinal movement of the nozzle needle is doing servohydraulic, ie via the fuel pressure in a control chamber which acts on the nozzle seat facing away from the end face of the nozzle needle with fuel pressure.
  • control chamber is connected via a drainage channel to a drainage chamber, which in turn is connectable to the low-pressure chamber via the control valve, wherein the control valve comprises a magnetic armature, which cooperates with a control valve seat and which is sleeve-shaped in the region of the control valve. If the electromagnet of the control valve is energized, the armature is pulled away from the control valve seat, and there is a flow cross-section between the armature and the control valve seat, so that fuel can flow from the drain chamber, which reduces accordingly the pressure in the control chamber and so the hydraulic Closing force on the nozzle needle.
  • the armature is guided on a valve pin, which is arranged in the interior of the magnet armature and whose end side limits the drainage space.
  • the drainage channel via which the control chamber is connected to the drainage chamber of the control valve, includes an outlet throttle, d. H. that the fuel Ström from the control chamber does not drain unthrottled into the drain chamber, but is damped due to the flow restrictors.
  • the outlet throttle is operated in the so-called cavitating operation, d. H. that formation of cavitation bubbles within the outlet throttle is intended, which determines the flow resistance and always leads to a constant flow resistance in the A-throttle.
  • the resulting cavitation bubbles implode after passing through the A-throttle, which is unproblematic as long as the implosion happens far away from the boundary of the drainage chamber and other components of the control valve.
  • the cavitation bubbles implode in this area and can lead to damage to the surfaces.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage over the fact that the flow is conducted within the drain chamber and in the region of the control valve so that the implosion of Kavitationsblasen happens from the limiting surfaces and thus damage due to the Implosion can be avoided.
  • the fuel injection valve has a piston-shaped nozzle needle, which cooperates with a sealing surface with a nozzle seat for opening and closing at least one injection opening.
  • a control chamber is formed in the fuel injection valve, which limits an end face of the nozzle needle remote from the nozzle seat, so that a pressure in the control chamber exerts a force acting in the direction of the nozzle seat on the nozzle needle, the control chamber being connected to an outlet space via a drainage bore is, which is connectable via a control valve with a low-pressure chamber.
  • the control valve in this case comprises a magnet armature, which cooperates with a control valve seat and which is sleeve-like design in the region of the control valve seat, the magnet armature surrounding a valve pin which projects into the drainage space. The projecting into the drain chamber end of the valve pin tapers and thus forms a tip.
  • the formation of the tip at the end of the valve piston Due to the formation of the tip at the end of the valve piston, the flow that flows from the drainage channel into the drainage chamber of the control valve, directed so that a stagnation point of the flow is avoided at the end face of the valve pin. Rather, the formation of the tip directs the flow so that stagnation points on the surfaces of the control valve are avoided and the vapor bubbles resulting from cavitation within the A restrictor no longer implode near walls.
  • the flow is through the Tip shape on the end face of the valve pin gently deflected in the radial direction, swirled there and the cavitation bubbles implode at a safe distance from the surfaces that limit the drain chamber and the control valve.
  • the tip projecting into the drainage space is conical.
  • a cone shape can be produced relatively easily, so that the additional costs in the manufacture of the fuel injection valve are manageable.
  • the length and angle of the cone can be easily changed and adapted to the requirements of the respective control valve.
  • a shoulder is formed at the transition of the conical tip of the valve pin to the actual valve pin. This paragraph acts as a baffle and causes the flow that flows past the valve pin in the direction of the flow cross-section between the armature and the control valve seat, is additionally swirled and thus the cavitation bubbles reliably implode away from the boundary walls.
  • the end of the valve pin forming the tip of the mouth of the flow channel is opposite in the drainage chamber. This ensures a symmetrical flow of the tip and thus the operation in the entire drainage chamber.
  • control valve seat is arranged downstream of the tip of the valve pin. Ie. the valve pin protrudes with its tip into the drain chamber, wherein the control valve seat is located downstream of the tip of the control valve pin.
  • Figure 1 shows a longitudinal section through a fuel injection valve according to the invention, wherein only the essential components are shown and
  • FIG. 3 enlargements of the designated A section of Figure 1 of two embodiments.
  • a fuel injection valve according to the invention is shown in longitudinal section, with only the essential components are shown.
  • the fuel injection valve 1 has a holding body 2, which is clamped to a nozzle body 6 by a device, not shown in the drawing.
  • a bore 5 is formed, which extends into the nozzle body 6 and which can be filled with fuel under high pressure.
  • the compressed fuel is supplied to the fuel injector, for example, from a high-pressure accumulation chamber, a so-called rail, and via a high-pressure passage, not shown in the drawing, within the holding body 2.
  • a nozzle needle 7 is arranged longitudinally displaceable, which is formed piston-shaped and which has at its combustion chamber end a sealing surface 13, with which the nozzle needle 7 formed in the nozzle body 6
  • Nozzle seat 10 cooperates to open and close at least a plurality of injection openings 8, which are formed at the combustion chamber end of the nozzle body. Lifting the nozzle needle 7 from the nozzle seat 10, so fuel flows from the bore 5 between the sealing surface 13 and the nozzle seat 10 through to the injection openings 8 and is through this in a combustion chamber of a
  • valve member 4 has a cylindrical portion 12 for receiving the nozzle needle 7auf, wherein through the cylindrical portion and the
  • a control chamber 15 is limited.
  • the control chamber 15 is hydraulically connected via a valve 16 formed in the inlet throttle 16 with the bore 5.
  • a drainage bore 20 is formed in the valve piece 4, which connects the control chamber 15 to an outlet space 40, as shown in FIG. 2 again enlarged, which shows an enlarged detail of the detail of FIG.
  • the discharge space 40 can be connected via a control valve 22 to a low-pressure space 33, wherein the control valve 22 is arranged above the valve piece 4 within a valve body 3, which by a clamping nut 9 against the
  • the control valve 22 comprises a magnetic armature 26, which is guided in a hollow cylindrical portion of the valve piece 4, which projects into the low pressure chamber 33 of the fuel injection valve and the inside of which forms a guide bore 31 for guiding the magnet armature 26.
  • the low-pressure space 33 is via a drain 35 with a return line, which in the
  • an electromagnet which consists of a magnetic coil 27 and a magnetic core 28 and which is disposed within the valve body 3.
  • the armature 26 cooperates with a control valve seat 23 which is formed in the valve piece 4 surrounding the drainage space 40, and is acted upon by the force of a prestressed valve spring 30 in the direction of the control valve seat 23 with a closing force.
  • the electric magnet 27, 28 is energized, the armature 26 is counter to the force of a valve spring
  • FIG. 2 shows once again an enlargement of the section of FIG. 1 designated by A.
  • the Abiaufbohrung 20 includes an outlet throttle 21 and a diffuser section 39 and opens into the drain chamber 40, which is formed by a countersink within the valve piece 4.
  • the valve pin 25 protrudes into the discharge space 40, tapers at its end facing the discharge channel 20 and thus forms a tip 38, which is conical in this exemplary embodiment.
  • the control valve seat 23 is located downstream of the tip 38 so that the fuel flowing from the drain passage 20 into the drain space 40 passes the tip 38 and flows through the control valve seat toward the bore 31.
  • the formation of the tip 38 bypasses the fuel stream at the tip 38 and passes through the constricted opening remaining between the tip 38 and the wall of the drainage space 40.
  • the fuel is thereby directed radially outward and thus set in slight vortex, wherein cavitation bubbles that arise within the outlet throttle 21 when flowing through the fuel are kept away from the wall of the drain chamber 40 and the valve pin 25 and implode inside the drain chamber 40, so that damage to the valve pin 25 and on the other surfaces of the valve member 4 and the control valve 22 omitted.
  • FIG. 3 shows a further embodiment of the fuel injection valve according to the invention in the same representation as Figure 2.
  • the embodiment of Figure 3 differs from that of Figure 2 only in the formation of the tip 38, which is here designed as a tip 38 'and also egg - Has a conical shape, but is at the transition of the tip 38 'to the valve pin
  • Turbulence of the fuel flow which flows between the tip 38 'and the wall of the drain chamber 40 to the control valve seat 23, further favors, so that the fuel flow and thus the imploding cavitation bubbles are reliably kept away from the surface of the drain chamber 40.

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 d'injection de carburant (1), destinée à des moteurs à combustion interne pour injecter du carburant à haute pression, qui comprend une aiguille de soupape (7) en forme de piston qui coopère par une face d'étanchéité (13) avec un siège de soupape (10) pour ouvrir et fermer au moins un orifice d'injection (8), et une chambre de commande (15) qui est délimitée par une face frontale, à l'opposé du siège de soupape (10), de l'aiguille de soupape (7), de sorte que la pression régnant dans la chambre de commande (15) exerce sur l'aiguille de soupape (7) une force agissant en direction du siège de soupape (10), la chambre de commande (15) étant reliée par un alésage de sortie (20) à un espace de sortie (40) qui peut être relié par une soupape de commande (22) à une chambre à basse pression (33), la soupape de commande (22) comportant un induit magnétique (26) qui coopère avec un siège de soupape de commande (23) et qui a une forme de manchon dans la région du siège de soupape de commande (23), l'induit magnétique (26) entourant une tige de soupape (25) qui fait saillie dans l'espace de sortie (40). L'extrémité, saillant dans la chambre de traitement (40), de la tige de soupape (25) est effilée et forme ainsi une pointe (38).
PCT/EP2016/058881 2015-06-16 2016-04-21 Soupape d'injection de carburant pour moteurs à combustion interne WO2016202488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015211043.5 2015-06-16
DE102015211043.5A DE102015211043A1 (de) 2015-06-16 2015-06-16 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO2016202488A1 true WO2016202488A1 (fr) 2016-12-22

Family

ID=55802376

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/058881 WO2016202488A1 (fr) 2015-06-16 2016-04-21 Soupape d'injection de carburant pour moteurs à combustion interne

Country Status (2)

Country Link
DE (1) DE102015211043A1 (fr)
WO (1) WO2016202488A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010043306A1 (de) * 2010-11-03 2012-05-03 Robert Bosch Gmbh Verfahren zum Betreiben eines magnetischen Schaltgliedes
EP2541036A1 (fr) * 2011-06-29 2013-01-02 Robert Bosch Gmbh Vanne de commande, procédé de fabrication d'une vanne de commande et injecteur de carburant doté d'une vanne de commande
EP2816219A1 (fr) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Soupape de contrôle pour un injecteur de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078407A1 (de) 2011-06-30 2013-01-03 Robert Bosch Gmbh Schaltventil zur Steuerung eines Kraftstoffinjektors und Kraftstoffinjektor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010043306A1 (de) * 2010-11-03 2012-05-03 Robert Bosch Gmbh Verfahren zum Betreiben eines magnetischen Schaltgliedes
EP2541036A1 (fr) * 2011-06-29 2013-01-02 Robert Bosch Gmbh Vanne de commande, procédé de fabrication d'une vanne de commande et injecteur de carburant doté d'une vanne de commande
EP2816219A1 (fr) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Soupape de contrôle pour un injecteur de carburant

Also Published As

Publication number Publication date
DE102015211043A1 (de) 2016-12-22

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