EP2478208A1 - Injecteur - Google Patents

Injecteur

Info

Publication number
EP2478208A1
EP2478208A1 EP10742454A EP10742454A EP2478208A1 EP 2478208 A1 EP2478208 A1 EP 2478208A1 EP 10742454 A EP10742454 A EP 10742454A EP 10742454 A EP10742454 A EP 10742454A EP 2478208 A1 EP2478208 A1 EP 2478208A1
Authority
EP
European Patent Office
Prior art keywords
pin
angle compensation
injector according
compensation element
injector
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
EP10742454A
Other languages
German (de)
English (en)
Other versions
EP2478208B1 (fr
Inventor
Nadja Eisenmenger
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 EP2478208A1 publication Critical patent/EP2478208A1/fr
Application granted granted Critical
Publication of EP2478208B1 publication Critical patent/EP2478208B1/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
    • 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 an injector according to the preamble of claim 1.
  • Such an injector is known from DE 10 2006 021 741 A1.
  • a control valve is provided, which releases or closes a connection from a control chamber into a fuel return via a closing element.
  • the closing element is exemplified by a magnet armature in which a pin is slidably guided, which is supported with its opposite end of the control chamber to a housing cover.
  • the valve cover end facing is provided with a radius, so that the end of the pin points punctiformly on the housing cover.
  • the radius is chosen as large as possible. This is manufacturing technology only possible with a relatively high effort. Disclosure of the invention
  • the invention is based on the object of further developing an injector according to the preamble of claim 1 such that tilting moments on the armature or on the pin are avoided or reduced at the lowest possible production outlay high tightness and low wear of the valve seat over the lifetime of the injector to allow. This object is achieved in an injector with the features of claim 1.
  • the invention is the
  • the angle compensation element facing at least one pin is formed at least substantially flat on the end portion and that the angle compensation element on the end portion of the pin facing side has a concave receptacle.
  • the receptacle is formed at least in the region of the contact surface of a spherical segment. Due to the spherical segment-like design of the receptacle, a relatively large contact surface can be achieved so that the surface pressure between the pin and the angle compensation element is kept within limits. This benefits the life of the injector or wear. Alternatively, however, it is also conceivable that the receptacle is frustoconical at least in the region of the contact surface. Such a design can be produced more cost-effectively compared to the spherical segment-shaped formation of the recording.
  • the end of the pin has a rounded contact edge in the region of the contact surface.
  • the radius of the contact edge is less than the corresponding radius in the region of the contact surface.
  • the invention can be used particularly preferably in an injector in which the angle between the longitudinal axis of the pin and the longitudinal axis of the angle compensation element is less than 5 °. With such a design, the wear over the life of the injector is limited. In particular, any tilting moments which may occur are compensated by the angle compensation element.
  • the angle compensation element is formed, for example, from a harder material than a valve cover, which further reduces wear.
  • the production of the valve cover is simplified.
  • the contact surfaces can be realized in the receptacle and the pin, if they are formed by grinding. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
  • FIG. 1 shows a longitudinal section through a portion of an injector according to the invention
  • FIG. 2 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element in a sectional representation
  • FIG. 3 shows a detail of FIG. 2 on an enlarged scale
  • FIG. 5 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element with a comparison with FIG. 2 modified angle compensation element in longitudinal section and
  • FIG. 6 shows an enlarged detail of the modified angle compensation element according to FIG. 5.
  • a part of an injector 1 which serves for injecting fuel into a combustion chamber of an internal combustion engine, in particular in a diesel engine.
  • Such an injector 1 is well known from so-called common rail systems.
  • the injector 1 has an injector body 10, in which a control valve 1 1 is arranged.
  • a control piston 12 is slidably guided, which releases when injecting and lowering not shown injection openings in the injector body 10 and thus injects the fuel into the combustion chamber of the internal combustion engine.
  • the control valve 1 1 is axially fixed in a recess of the injector body 10 with the interposition of a disc 14 by means of a valve clamping screw 15.
  • the injector body 10 has an annular space 13, which is connected via one or more inlet throttles 16 to a control chamber 17 formed above the control piston 12 within the control valve 11.
  • the control chamber 17 is connected via an outlet throttle 18 with a valve chamber 20.
  • the valve chamber 20 designed as a closing element armature 22 is arranged axially displaceable, which serves for controlling the fuel flow from the control chamber 17 into the valve chamber 20.
  • the armature 22 forms with the bottom 24 of its extension 25 on a surface of the control valve 1 1 a flat seat 26, so when lifting the armature
  • the extension 25 of the armature 22 is in a sleeve-like extension 28 of the
  • a pin 30 is axially movably guided in a through hole 29, the lower, the outlet throttle 18 side facing the outlet throttle 18 covers.
  • the diameter d of the pin 30 substantially corresponds to the diameter of the seat 31 formed by the underside 24 of the armature 22.
  • the upper region of the pin 30 is surrounded outside the armature 22 by a spring element 33.
  • the spring element 33 is supported between the upper side of the armature 22 and a housing cover 34 of the injector 1 designed as a support element.
  • the spring element 33 is surrounded by a sleeve 35, which is arranged in an inner bore of a magnetic core 36. If the magnetic coil 37 is not energized, the armature 22 is pressed against the seat 31 due to the spring force of the spring element 33 and in this case closes the outlet throttle 18.
  • the Anchor 22 lifts the armature 22 away from the seat 31, so that a net return flow from the control chamber 17 into the return bore 23 occurs.
  • Essential to the invention is the arrangement or mounting of the pin 30 on its side facing away from the control chamber 17 in the region of the housing cover 34th
  • the upper end 38 of the pin 30 is slightly reduced in diameter and arranged within an angle compensation element 40.
  • the angle compensation element 40 has a cylindrically shaped body which has a receptacle 42 on its side facing the pin 30.
  • the receptacle 42 in this case has a cylindrically shaped first region 43 which merges into a second region 44 formed in the manner of a spherical segment.
  • the end 38 of the pin 30 bears against an annular contact surface 45. Since the pin 30 with its outlet throttle 18 facing bottom is always under the high pressure of the fuel, in this case a pointing in the direction of the angle compensation element 40 axial force is generated.
  • the angle compensation element 40 rests with its flat upper side 47 against the facing surface of the housing cover 34. How to look in particular from the
  • the circumferential edge 48 of the end 38 of the pin 30 has a radius r, which is smaller than the radius R, which is formed in the second region 44 of the angle compensation element 40.
  • both the radius r of the edge 48 and the radius R of the receptacle 42 are made by grinding.
  • FIG. 4 shows a modified embodiment in which the edge 48a of the end 38a has a radius r 'which is only slightly smaller than The radius R of the receptacle 42.
  • This has the advantage that when transmitting the axial force, the edge 48a over a large area to the radius R of the receptacle 42 hugs, so that the contact surface 45a increases and thus the surface pressure between the end 38a and the Shot 42 is reduced.
  • FIGS. 5 and 6 show a modified angle compensation element 50, which has been modified relative to the angle compensation element 40 in the region of the second region 51 in such a way that the second region 51 has a conical shape.
  • a rectilinear receiving surface 52 is formed in the angle compensation element 50. This results in a bearing surface 53 which is slightly reduced in relation to the angle compensation element 40.
  • the injector 1 described so far can be modified or modified in a variety of ways. So it is also conceivable, for example, instead of a one-piece pin 30 to use a plurality of longitudinally successively arranged anchor pins. Essential to the invention is only the storage of the pin in the region of the valve cover or the pin, which is arranged on the opposite side of the control chamber.

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)

Abstract

La présente invention concerne un injecteur (1) destiné à injecter du carburant dans une chambre de combustion d'un moteur à combustion interne, un élément d'injection débloquant ou fermant au moins une ouverture d'injection étant commandé par une soupape de commande (11), la soupape de commande (11) débloquant ou bloquant une liaison allant d'un espace de commande (17) à une conduite de retour de carburant (23) du fait qu'un élément de fermeture (22) est posé dans un siège (31) ou débloque celui-ci, un trou (29) dans lequel au moins une tige (30) est logée axialement mobile étant réalisé dans l'élément de fermeture (22), et le diamètre du trou (29) correspondant sensiblement au diamètre de la tige (30), et la ou les tiges (30) s'appuyant avec leur partie d'extrémité (38 ; 38a) opposée à l'élément de fermeture (22) au moins directement contre un élément d'appui (34). Selon l'invention, un élément de compensation angulaire (40 ; 50) est disposé entre la partie d'extrémité (38 ; 38a) de la ou des tiges (30) et l'élément d'appui (34), et une surface d'appui (45 ; 45a) de forme annulaire est réalisée entre l'élément de compensation angulaire (40 ; 50) et la partie d'extrémité (38 ; 38a) de la ou des tiges (30).
EP10742454.1A 2009-09-18 2010-07-29 Injecteur Not-in-force EP2478208B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009029563A DE102009029563A1 (de) 2009-09-18 2009-09-18 Injektor
PCT/EP2010/061023 WO2011032770A1 (fr) 2009-09-18 2010-07-29 Injecteur

Publications (2)

Publication Number Publication Date
EP2478208A1 true EP2478208A1 (fr) 2012-07-25
EP2478208B1 EP2478208B1 (fr) 2017-09-06

Family

ID=42880610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10742454.1A Not-in-force EP2478208B1 (fr) 2009-09-18 2010-07-29 Injecteur

Country Status (3)

Country Link
EP (1) EP2478208B1 (fr)
DE (1) DE102009029563A1 (fr)
WO (1) WO2011032770A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013221554A1 (de) * 2013-10-23 2015-04-23 Robert Bosch Gmbh Kraftstoffinjektor
DE102015202726A1 (de) * 2015-02-16 2016-08-18 Robert Bosch Gmbh Steuerventilanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102007047425A1 (de) * 2007-10-04 2009-04-09 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102008003348A1 (de) * 2008-01-07 2009-07-09 Robert Bosch Gmbh Kraftstoffinjektor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2011032770A1 *

Also Published As

Publication number Publication date
EP2478208B1 (fr) 2017-09-06
DE102009029563A1 (de) 2011-03-24
WO2011032770A1 (fr) 2011-03-24

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