EP1916410B1 - Soupape de distribution pour un injecteur et injecteur - Google Patents

Soupape de distribution pour un injecteur et injecteur Download PDF

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Publication number
EP1916410B1
EP1916410B1 EP07114577A EP07114577A EP1916410B1 EP 1916410 B1 EP1916410 B1 EP 1916410B1 EP 07114577 A EP07114577 A EP 07114577A EP 07114577 A EP07114577 A EP 07114577A EP 1916410 B1 EP1916410 B1 EP 1916410B1
Authority
EP
European Patent Office
Prior art keywords
ball
valve
guide bore
injector
pressure pin
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.)
Not-in-force
Application number
EP07114577A
Other languages
German (de)
English (en)
Other versions
EP1916410A2 (fr
EP1916410A3 (fr
Inventor
Thomas Sebastian
Patrick Mattes
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 EP1916410A2 publication Critical patent/EP1916410A2/fr
Publication of EP1916410A3 publication Critical patent/EP1916410A3/fr
Application granted granted Critical
Publication of EP1916410B1 publication Critical patent/EP1916410B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention has for its object to provide a control valve for an injector whose components are easier and cheaper to produce and in which the wear of the valve member is reduced, so that increases the life of the injector.
  • valve member in particular in the region of the ball, are guided in a guide bore of the valve housing.
  • This has the valve member always a defined position, so that in particular upon impact of the valve member on a sealing seat in the valve housing no relative movements between the valve member and the valve seat can occur, which bring a wear of the valve member and / or the valve seat with it.
  • Such balls are produced for example in the manufacturers of ball bearings with very small tolerances in large numbers. As a result, the costs are relatively low despite the great precision and quality. Since ball bearing balls are commercially available with different tolerance layers, it is also possible to produce the guide bore with relatively large tolerances and then with a valve member according to the invention whose ball has the appropriate diameter to mate. As a result, the manufacturing costs are further reduced without having to make any compromises in the quality of the guide of the valve member in the guide bore.
  • a linear contact surface between the ball and the guide bore is interrupted by at least one first flattening in the spherical surface.
  • the pressure pin In order to operate the valve member in a simple manner, it is provided to arrange the pressure pin in the guide bore, the pressure pin advantageously protrudes from the guide bore and on an actuator, preferably a hydraulic coupler or a piezoelectric actuator, but also an electromagnetic actuator rests.
  • an actuator preferably a hydraulic coupler or a piezoelectric actuator, but also an electromagnetic actuator rests.
  • the guide bore is designed as a stepped bore, and if a shoulder in the guide bore serves as a stop and / or as a sealing seat for the valve member. This makes it possible to provide three switching positions in the control valve according to the invention, which may be advantageous in particular in connection with one or more pre-injections and divided main injections or additional post-injections.
  • the guide bore is formed in a valve plate. Furthermore, it has proved to be advantageous if a sleeve is attached to the pressure pin at one end remote from the ball, and when between the sleeve and the injector, in particular the valve plate, a compression spring is clamped. This makes it possible, first valve plate and valve member to mount before mounting in the injector as a captive assembly. On the other hand, the compression spring serves to bring the valve member in a defined switching position with a pressureless injector.
  • control valve is designed as a flat-seated valve and has the ball at a second end opposite the pressure bolt, a second flattening, wherein the second flattening cooperates with a flat seat of the control valve.
  • FIG. 1 an embodiment of a piezo actuated injector 1 according to the invention is shown. Since the present invention essentially relates to a control valve 3, the injector 1 is not explained in detail, but essentially only the embodiment of Control valve 3 and its connection to a piezoelectric actuator 5 described. The function of an injector 1 are known to a person skilled in the art of injection technology and therefore require no further explanation.
  • the injector 1 has a high-pressure port 7.
  • the injector 1 is supplied with high-pressure fuel (not shown) via the high-pressure port 7. If an injection is to take place in the combustion chamber, not shown, of an internal combustion engine, lifting a nozzle needle 9 from its seat, not shown, and also releases injection holes, not shown.
  • the nozzle needle 9 is controlled by the control valve 3, which is actuated by a piezoelectric actuator 5. Between the piezoelectric actuator 5 and the control valve 3, a hydraulic coupler 11 is arranged, which in FIG. 2 is shown enlarged together with the control valve 3 according to the invention.
  • the hydraulic coupler 11 consists essentially of a valve piston 13 and a booster piston 15, which are guided in a coupler housing 17. Between the valve piston 13 and the booster piston 15, a coupler gap 19 is present, which is filled with fuel (not shown). This coupler gap 19 is necessary inter alia because the temperature expansion coefficients of the piezoelectric actuator 5 and the metallic components of the injector 1 differ greatly.
  • the hydraulic coupler 11 actuates the control valve 3, while the booster piston 15 bears against the piezoelectric actuator 5 with a projection 21.
  • the booster piston 15 is acted upon by a tube spring 23 with a pressure bias.
  • the tube spring 23 is supported with its first end against a shoulder 25 of the coupler housing 17. With its second end, the tube spring 23 is supported against a shim 27. About the shim 27 and a projection (without reference numeral), the spring force of the tube spring 23 is transmitted to the piezoelectric actuator 5.
  • the tube spring 23 is arranged concentrically to the hydraulic coupler 11 and thus concentric to the piezoelectric actuator 5, the diameter D 1 of the shoulder 25 is matched to the inner diameter of the tube spring 23, that the tube spring 23 is slightly widened when it on the paragraph 25 is postponed. Since the tube spring 23 according to the invention is a has over the entire length extending joint (not shown), the tube spring 23 can relatively easily widen so far that it fits on the shoulder 25.
  • tube spring 23 is acted upon by a compressive bias, it is sufficient if this can be supported at their ends in the axial direction, as in FIG. 1 is shown.
  • FIG. 1 is easy to see that below the control valve 3, a so-called throttle plate 29 is present. Below the throttle plate 29, a control chamber 31 is present, which is limited at one end by the nozzle needle 9 in a conventional manner.
  • FIG. 2 it can be seen that the control valve 3 is arranged in a valve plate 33.
  • valve member of the control valve 3 according to the invention is in FIG. 2 provided with the reference numeral 35.
  • the valve member 35 comprises a ball 37, which preferably consists of hardened steel, and a pressure pin 39.
  • the pressure pin 39 is welded to the ball 37.
  • the associated weld has in FIG. 2 the reference numeral 41.
  • the ball 37 of the valve member 35 is received in a first portion of the stepped guide bore 43, said first portion having a diameter which allows a play-free guidance of the ball 37. Between the guide bore 43 and the ball 37, there is a linear contact surface. This contact line is in FIG. 2 provided with the reference numeral 45.
  • first flats 47 are provided on the circumference of the ball 37. These first flattenings 47 can be produced, for example by grinding. In the lower part of the FIG. 2 a section along the line AA is shown. From this representation it follows that the first flats 47 release a circular segment-shaped cross-section through the Fuel between the guide bore 43 and the ball 37 can flow past.
  • a shoulder 49 of the guide bore 43 is formed frusto-conical and serves as a stop and / or sealing seat for the valve member 35th
  • a second section of the guide bore 43 connects, which has a relation to the first portion of the guide bore 43 reduced diameter.
  • the outlet throttle 51 is usually connected to the control chamber 13 (see FIG. 1 ) hydraulically connected.
  • a sleeve 53 is pressed onto the pressure pin 39. Between the sleeve 53 and the valve plate 33, a compression spring 55 is provided, which ensures that the ball 37 of the valve member 35 is in currentless piezoelectric actuator in contact with the shoulder 49 of the valve plate 33 itself.
  • the piezoelectric actuator 5 is energized and presses on the hydraulic head 11, the valve member against a formed on the throttle plate 29 flat seat (without reference numeral).
  • a second flattening 57 on the ball 37 is present, which closes the outlet throttle 51 together with the flat seat.
  • the control valve 3 is opened so that fuel from the control chamber 29 flow through the outlet throttle 51 and through the guide bore 53 can flow in a return, not shown.

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)

Claims (8)

  1. Injecteur pour un système d'injection d'un moteur à combustion interne, comprenant un pointeau de buse (9), une soupape de commande (3) et un actionneur (5), la soupape de commande (3) comprenant un organe de soupape (35), et la soupape de commande (3) commandant une liaison hydraulique entre un espace de commande (31) et un retour de carburant, et l'organe de soupape (35) comprenant une bille (37) et un boulon de pression (39), et la bille (37) étant guidée dans un alésage de guidage (43) d'un boîtier de soupape (33), une surface de contact linéaire (45) étant formée entre la bille (37) et l'alésage de guidage (43), caractérisé en ce que la surface de contact linéaire (45) est interrompue par au moins un premier méplat (47) dans la surface de la bille, en ce que la soupape de commande (3) est réalisée sous forme de soupape à siège plat, et en ce que la bille (37) présente, à une extrémité opposée au boulon de pression (39), un deuxième méplat (57), et en ce que le deuxième méplat (57) coopère avec un siège plat.
  2. Injecteur selon la revendication précédente, caractérisé en ce que le boulon de pression (39) est disposé dans l'alésage de guidage (43).
  3. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alésage de guidage (43) est réalisé sous forme d'alésage étagé, et en ce qu'un épaulement (49) dans l'alésage de guidage (43) sert de butée et/ou de siège d'étanchéité pour l'organe de soupape (35).
  4. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alésage de guidage (43) est réalisé dans une plaque de soupape (33).
  5. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une douille (53) est fixée sur le boulon de pression (39) à une extrémité du boulon de pression (39) opposée à la bille (37), et en ce qu'entre la douille (53) et le boîtier d'injecteur, notamment la plaque de soupape (33), est comprimé un ressort de pression (55).
  6. Injecteur selon la revendication 5, caractérisé en ce que la douille (53) est pressée avec le boulon de pression (39).
  7. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la bille (37) et le boulon de pression (39) sont soudés l'un à l'autre.
  8. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la soupape de commande (3) est actionnée par un actionneur piézoélectrique (5) ou par un actionneur électromagnétique.
EP07114577A 2006-10-20 2007-08-20 Soupape de distribution pour un injecteur et injecteur Not-in-force EP1916410B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006049533A DE102006049533A1 (de) 2006-10-20 2006-10-20 Steuerventil für einen Injektor und Injektor

Publications (3)

Publication Number Publication Date
EP1916410A2 EP1916410A2 (fr) 2008-04-30
EP1916410A3 EP1916410A3 (fr) 2008-12-17
EP1916410B1 true EP1916410B1 (fr) 2010-10-20

Family

ID=39110809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07114577A Not-in-force EP1916410B1 (fr) 2006-10-20 2007-08-20 Soupape de distribution pour un injecteur et injecteur

Country Status (3)

Country Link
EP (1) EP1916410B1 (fr)
AT (1) ATE485444T1 (fr)
DE (2) DE102006049533A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000875A1 (de) * 2009-02-16 2010-08-19 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042799A3 (fr) * 1980-06-23 1982-01-13 The Bendix Corporation Injecteur électromagnétique de carburant
DE3312067A1 (de) * 1983-04-02 1984-10-04 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
DE10046416C2 (de) * 2000-09-18 2002-11-07 Orange Gmbh Ventilausbildung für Steuerventile
DE10255328A1 (de) * 2002-11-27 2004-06-17 Robert Bosch Gmbh Ventileinrichtung, insbesondere für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE10319694A1 (de) * 2003-05-02 2004-12-02 Robert Bosch Gmbh Brennstoffeinspritzventil

Also Published As

Publication number Publication date
EP1916410A2 (fr) 2008-04-30
ATE485444T1 (de) 2010-11-15
DE102006049533A1 (de) 2008-04-24
DE502007005398D1 (de) 2010-12-02
EP1916410A3 (fr) 2008-12-17

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