WO2017025220A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2017025220A1
WO2017025220A1 PCT/EP2016/063171 EP2016063171W WO2017025220A1 WO 2017025220 A1 WO2017025220 A1 WO 2017025220A1 EP 2016063171 W EP2016063171 W EP 2016063171W WO 2017025220 A1 WO2017025220 A1 WO 2017025220A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve member
injection valve
guide surface
fuel
injection
Prior art date
Application number
PCT/EP2016/063171
Other languages
German (de)
English (en)
Inventor
Lars Olems
Frank Mertin
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 WO2017025220A1 publication Critical patent/WO2017025220A1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • 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

Definitions

  • the known fuel injector comprises a substantially cylindrical injection valve member arranged in a holding body.
  • the injection valve member has a guide surface, wherein the guide surface is guided longitudinally movably in a guide bore formed in a valve piece.
  • the valve piece is clamped to the holding body.
  • the injection valve member opens and closes by its longitudinal movement injection openings in the combustion chamber of the
  • the injection openings are arranged adjacent to the guide surface opposite the end of the injection valve member.
  • Due to the longitudinal movement of the injection valve member may cause wear on the injection valve member and the valve piece in the region of guide bore and guide surface.
  • the fuel injector comprises a substantially cylindrical injection valve member arranged in a holding body.
  • the injection valve member has a guide surface in an end region.
  • the guide surface is longitudinally movably guided in a guide bore formed in a valve piece.
  • the valve piece is clamped to the holding body.
  • the injection valve member opens and closes by its longitudinal movement injection openings in the combustion chamber. The injection openings are adjacent to the guide surface
  • Guide surface has a convex shape in longitudinal section.
  • Guide surface and guide hole designed comparatively gentle. It comes to a contact with comparatively large contact surfaces and
  • Guide surface reduces the cause of the reaction moments distance of the contact pair between the guide bore and guide surface and consequently also the reaction torque.
  • Fuel injector are balanced without the same time
  • the convex shape of the guide surface is designed so that the diameter of the guide surface over the length of the guide surface by 20 ⁇ to 40 ⁇ varies. This ensures a good resistance to wear. At the same time a good seal over the length of the guide surface is nevertheless achieved.
  • the convex shape has a circular arc or a constant radius. This shape is easy to manufacture, for example by a grinding process.
  • the convex shape of the guide surface is logarithmic. This is particularly advantageous to the maximum surface pressure in the contact between guide surface and
  • the guide surface has a first partial surface and a second partial surface.
  • the first partial surface is arranged on the injection-most remote region of the guide surface, and the second partial surface is arranged on the injection region next to the region of the guide surface.
  • Both faces can taper outwards.
  • the guide surface still has a third partial surface, which is arranged between the first partial surface and the second partial surface.
  • the coaxial running direction between injection valve member and valve piece can be improved by the middle third partial surface; on the other hand, a possible sealing function in the gap between the
  • Guide bore and the guide surface can be improved.
  • the third partial surface can be designed to be cylindrical. This can be made for example by a simple grinding process.
  • the first partial surface tapers with
  • Injection valve member in the contact between the guide surface and guide bore is thereby attenuated.
  • the maximum surface pressure is reduced and with it the wear of the contact partners.
  • the tapering of the first partial surface can take place with a constant radius or logarithmically. So can the ideal shape of the Guide surface can be very well adapted to the geometries of the components involved.
  • the logarithmic shape is for example particularly advantageous with a very narrow gap between the guide surface and
  • the second partial surface tapers outwards, ie with decreasing distance to the injection openings. Analogous to the above representations, this also results in a reduction of the wear. Again, the taper can be done with a constant radius or logarithmic.
  • the injection valve member has a length of 100 mm to 200 mm. Especially with comparatively long injection valve members, it may be due to the shape and position tolerances to angle errors,
  • the configuration of the guide surface with a convex shape is particularly effective to minimize or prevent wear.
  • the injection valve member in its central region diameter of 2.0 mm to 3.5 mm. With comparatively thin injection valve members there is a risk of bending in the case of misalignment. Due to the convex shape of the guide surface, a coaxial alignment of the injection valve member is promoted to the valve piece during operation.
  • the injection valve member is longitudinally movably guided in a region adjacent to the injection openings by a nozzle bore.
  • the injection valve member has two
  • the convex shape of the guide surface is particularly advantageous to compensate for the position tolerances or angular error can.
  • FIG 1 is a schematic representation of a fuel! Njektors from the prior art
  • Figure 2 schematically an injection valve member of a fuel! njektors from the prior art
  • Figure 2a is an ideally aligned
  • Injection valve member and Figure 2b shows a tilted injection valve member
  • FIG 3 schematically an injection valve member of an inventive
  • Injection valve member and Figure 3b shows a tilted injection valve member
  • Figure 5 is an injection valve member in a further embodiment
  • FIG. 6 shows an injection valve member in a further embodiment
  • FIG. 1 is a schematic view of a fuel injector 10, as known from the prior art. With the fuel! Injector 10, fuel is injected into the combustion chamber of an internal combustion engine. Of the
  • the injector 10 comprises a holding body 12 and a magnet group 14.
  • the magnet group 14 receives a magnetic coil 16, via which a movable in the holding body 12 received injection valve member 18 can be actuated.
  • any desired control can be used for the injection valve member 18, for example one
  • the injection valve member 18 - formed in a generally needle-shaped - are at a combustion chamber end of the fuel injector 10 formed on a nozzle body 19 injection openings 21 into the combustion chamber of
  • Combustion chamber can be injected.
  • the nozzle body 19 is through a
  • the fuel injector 10 further includes a valve piece 22, which is installed in the holding body 12 and control volume for actuating the
  • Injection valve member has, whose opening or closing by the
  • Magnet group 14 is controlled. Furthermore, in the valve piece 22 a
  • Guide bore 30 is formed, in which the injection valve member 18 is guided longitudinally movable.
  • a control chamber 1 1 is formed between the valve member 22 and the end face of the injection valve member 18.
  • the magnet group 14 controls the pressure in the control chamber 1 1.
  • Fuel injector 1 1 is such that at a pressure reduction in the control chamber 1 1, the injection valve member 18 pushes into the control chamber 1 1 and thus the injection ports 21 free and that at an increase in pressure in the control chamber 1 1 this hydraulic pressure, the injection valve member 18 in the direction of Forces combustion chamber and thereby the injection openings 21 are closed.
  • the longitudinal movement of the injection valve member 18 is provided by the guide bore 30 in the valve piece 22 and by a nozzle bore 19 formed in the nozzle bore
  • Injection valve member 18 formed guide surface 18 a together.
  • Characteristic of such embodiments of fuel injectors 10 is the comparatively long injection valve member 18.
  • the comparatively long injection valve member 18 Preferably, the
  • Injection valve member 18 at diameters of 2.0 mm to 3.5 mm lengths of 100 mm to 200 mm.
  • the two guides, so the guide bore 30 and the nozzle bore 17, the injection valve member 18 have due to component tolerances in the fuel injector 10 deflections and voltages of the injection valve member 18 result.
  • In the two guides or bearings Consequently, it comes to reaction forces and thus also to friction and wear. Functional losses and a shortened life are the result.
  • Fig. 2a shows schematically a prior art injection valve member 18 which is ideally aligned in the valve piece 22; the guide bore 30 and the
  • Fig. 2b shows the injection valve member of the prior art, which is tilted in the valve piece 22. It comes between the guide bore 30 and the guide surface 18a idealized to two points of contact, real to two contact surfaces: a first touch point 1 and a second touch point 2, which are typically at opposite ends - both the length and the circumference - the guide surface 18a. The axial distance ai between the two points of contact is therefore comparatively large. In operation, it comes through the injection processes of the fuel! njektor 10 too
  • the potential contact between the guide surface 18a and the guide bore 30 is now designed such that the wear between the valve piece 22 and the injection valve member 18 is minimized. The following will be
  • FIG. 3a shows an injection valve member 18 on which a guide surface 18a is formed, which has a convex shape viewed in the axial direction, ie in longitudinal section. Due to the convex shape, the guide surface 18a has the largest diameter in its central region and at its two ends the smallest diameter. Does it come to a tilting of the
  • the contact points 1, 2 are real contact surfaces with larger
  • the convex shape of the guide surface 18a thus has larger contact surfaces at the contact points 1, 2 result and accordingly smaller
  • the guide surface 18a is executed crowned.
  • the center (as viewed in the axial direction) of the guide surface 18a preferably has a larger diameter by 20 ⁇ m to 40 ⁇ m than the two ends or outer regions of the guide surface 18a.
  • FIGS. 4 to 6 show further advantageous embodiments of the guide surface 18a of the injection valve member 18:
  • FIG. 4 shows an injection valve member 18 with a three-part guide surface
  • the third partial surface 18a3 is cylindrical with a comparatively large diameter.
  • the first partial surface 18a1 and the second partial surface 18a2 taper with increasing distance from the middle third partial surface 18a2.
  • the tapers can, for example, linear, with a
  • the injection valve member 18 is advantageously designed tapered in its central region 18 m relative to the guide surface 18 a.
  • the middle region 18m preferably has a diameter of 2.0 mm to 3.5 mm.
  • 5 shows an injection valve member 18 with a two-part guide surface 18a: a first partial surface 18a1, which at the injection openings 21st
  • the opposite end of the injection valve member 18 is arranged, and a second partial surface 18 a 2, which is disposed closest to the injection openings 21.
  • the first partial surface 18a1 thereby tapers in the direction of the control chamber 11, and the second partial surface 18a2 tapers in the direction of the injection openings 21.
  • the tapers can be linear, with a radius or logarithmic, for example.
  • FIG. 6 shows an injection valve member 18 with a three-part guide surface 18a: a first partial surface 18a1, which at the injection openings 21st
  • the third partial surface 18a3 is cylindrical with a comparatively large diameter.
  • the first partial surface 18a1 and the second partial surface 18a2 are respectively trapezoidal in section and taper with increasing distance from the middle third partial surface 18a3.
  • the operation of the fuel injector 10 according to the invention is as follows:
  • injections via the injection openings 21 into the combustion chamber of the internal combustion engine are carried out by the longitudinal movement of the injection valve member 18, whose longitudinal movements are in turn controlled by the magnetic group 14, wherein, alternatively, other controls of
  • Injection valve member 18 can be used.
  • the injection valve member 18 is at its opposite end of the injection openings on the
  • the guide surface 18a is convex in order to to force a gentler contact between guide surface 18a and guide bore 30.
  • This design of the guide surface 18a increases the contact area and reduces the surface pressure with it. Furthermore, the two points of contact 1, 2 between the guide surface 18 a and the guide bore 30 are pushed closer to each other, so that the lever or

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant (10) servant à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. L'injecteur de carburant (10) comprend une soupape d'injection (18) sensiblement cylindrique disposée dans un corps de maintien (12). La soupape d'injection (18) comporte dans une zone d'extrémité une surface de guidage (18a) qui est guidée de manière mobile dans le sens de la longueur dans un perçage de guidage (30) pratiqué dans un élément soupape (22). L'élément soupape (22) est bloqué avec le corps de maintien (12). La soupape d'injection (18) ouvre et ferme par son mouvement longitudinal des orifices d'injection (21) dans la chambre de combustion. Les orifices d'injection (21) sont adjacents à l'extrémité de la soupape d'injection (18) opposée à la surface de guidage (18a). La surface de guidage (18a) présente une forme convexe en coupe longitudinale.
PCT/EP2016/063171 2015-08-11 2016-06-09 Injecteur de carburant WO2017025220A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015215321.5A DE102015215321A1 (de) 2015-08-11 2015-08-11 Kraftstoffinjektor
DE102015215321.5 2015-08-11

Publications (1)

Publication Number Publication Date
WO2017025220A1 true WO2017025220A1 (fr) 2017-02-16

Family

ID=56116445

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/063171 WO2017025220A1 (fr) 2015-08-11 2016-06-09 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102015215321A1 (fr)
WO (1) WO2017025220A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849933A1 (de) * 1998-10-29 2000-05-11 Siemens Ag Stellanordnung, insbesondere zur mechanischen Ansteuerung eines Einspritzventils einer Brennkraftmaschine
WO2003004865A1 (fr) * 2001-07-07 2003-01-16 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
DE102004040141A1 (de) * 2004-08-19 2006-02-23 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
FR2890122A3 (fr) * 2005-08-25 2007-03-02 Renault Sas Injecteur de carburant pour moteur a combustion interne
DE102005061781A1 (de) * 2005-12-23 2007-06-28 Schaeffler Kg Injektor eines Kraftstoff-Einspritzsystems
EP2383459B1 (fr) 2010-04-29 2013-06-19 Robert Bosch GmbH Dispositif de fixation d'un connecteur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849933A1 (de) * 1998-10-29 2000-05-11 Siemens Ag Stellanordnung, insbesondere zur mechanischen Ansteuerung eines Einspritzventils einer Brennkraftmaschine
WO2003004865A1 (fr) * 2001-07-07 2003-01-16 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
DE102004040141A1 (de) * 2004-08-19 2006-02-23 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
FR2890122A3 (fr) * 2005-08-25 2007-03-02 Renault Sas Injecteur de carburant pour moteur a combustion interne
DE102005061781A1 (de) * 2005-12-23 2007-06-28 Schaeffler Kg Injektor eines Kraftstoff-Einspritzsystems
EP2383459B1 (fr) 2010-04-29 2013-06-19 Robert Bosch GmbH Dispositif de fixation d'un connecteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
K.L.JOHNSON: "Contact Mechanics", 31 December 2003 (2003-12-31), pages 129 - 134, XP055289707, ISBN: 978-0-521-34796-9, Retrieved from the Internet <URL:http://ebooks.cambridge.org/ebook.jsf?bid=CBO9781139171731> [retrieved on 20160719] *

Also Published As

Publication number Publication date
DE102015215321A1 (de) 2017-02-16

Similar Documents

Publication Publication Date Title
EP1963659B1 (fr) Injecteur de carburant dote d&#39;un organe de soupape d&#39;injection a actionnement direct
EP3822475B1 (fr) Vanne de dosage d&#39;un fluide
EP2470771B1 (fr) Injecteur de carburant
EP2816219A1 (fr) Soupape de contrôle pour un injecteur de carburant
DE102014217441A1 (de) Elektromagnetisch betätigbares Proportionalventil
EP1290335B1 (fr) Soupape d&#39;injection de carburant
DE102012222127A1 (de) Kraftstoffinjektor
DE102011004644A1 (de) Ventil für eine Komponente eines Kraftstoffeinspritzsystems sowie Kraftstoffinjektor
WO2017025220A1 (fr) Injecteur de carburant
EP2458194B1 (fr) Soupape d&#39;injection de carburant pour moteurs à combustion interne
EP1999363B1 (fr) Soupapes d&#39;injection de carburant pour moteurs a combustion interne
EP3060789B1 (fr) Injecteur de carburant
DE102018000058B4 (de) Betätigungsvorrichtung, insbesondere zum Betätigen von Ventilen,sowie Ventilansteuersystem
EP2630361B1 (fr) Injecteur de carburant
EP2824310A1 (fr) Soupape d&#39;injection de carburant pour moteurs à combustion interne
EP2960487B1 (fr) Soupape d&#39;injection de carburant pour moteurs à combustion interne
EP2957760B1 (fr) Ensemble de buses pour un injecteur de carburant et injecteur de carburant
WO2011160900A1 (fr) Dispositif d&#39;injection de carburant à coupleur hydraulique
EP1972779A1 (fr) Coupleur hydraulique
EP1210512B1 (fr) Injecteur
WO2016131512A1 (fr) Système à haute pression de carburant pour moteurs à combustion interne
WO2017036666A1 (fr) Injecteur de carburant
EP4314540A1 (fr) Buse d&#39;injection, injecteur de carburant ayant une buse d&#39;injection
EP2955366B1 (fr) Ensemble de buses pour un injecteur de carburant et injecteur de carburant
WO2024217782A1 (fr) Injecteur de gaz ayant un actionneur magnétique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16728026

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16728026

Country of ref document: EP

Kind code of ref document: A1