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EP2318688A1 - Corps de buse, ensemble buse et injecteur de carburant, et procédé de fabrication d'un corps de buse - Google Patents

Corps de buse, ensemble buse et injecteur de carburant, et procédé de fabrication d'un corps de buse

Info

Publication number
EP2318688A1
EP2318688A1 EP09780310A EP09780310A EP2318688A1 EP 2318688 A1 EP2318688 A1 EP 2318688A1 EP 09780310 A EP09780310 A EP 09780310A EP 09780310 A EP09780310 A EP 09780310A EP 2318688 A1 EP2318688 A1 EP 2318688A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle body
needle
blind hole
bore
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.)
Ceased
Application number
EP09780310A
Other languages
German (de)
English (en)
Inventor
Tobias Sander
Alexander Vincon
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2318688A1 publication Critical patent/EP2318688A1/fr
Ceased legal-status Critical Current

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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M61/06—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 the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation

Definitions

  • the invention relates to a nozzle body for a nozzle assembly, and to a nozzle assembly for a fuel injector, in particular a common rail fuel injector, for a combustion chamber of an internal combustion engine. Furthermore, the invention relates to a fuel injector with a nozzle body according to the invention or a nozzle assembly according to the invention. Moreover, the invention relates to a method for introducing a nozzle bore into a nozzle body of a fuel injector.
  • Injection of fuel usually by means of a nozzle needle which is slidably mounted in the fuel injector and one or a plurality of spray holes of a nozzle body of the nozzle assembly in dependence on their position releases or closes for the fuel to be injected.
  • a mechanical control of the nozzle needle is usually carried out by an actuator which acts either directly, or via a servo valve and a control chamber on a Uberra- transmission member (piston), which usually interacts mechanically with the nozzle needle.
  • the nozzle needle and the transmission member are hereby usually slide-mounted in a Gleitbowung with a small clearance, with a lubrication of this storage is usually carried out by the fuel to be injected.
  • the fuel injectors of a series used In order to reduce the pollutant emissions and also to keep consumption of the internal combustion engine as low as possible, it is desirable for the fuel injectors of a series used to show, as far as possible, an essentially identical behavior in all areas of use. This applies in addition to an injection time in particular for a fuel quantity to be injected per injection or per single injection. The problem here are u. a. depending on the fuel injector fluctuating hydraulic
  • Diameter in an area downstream of a nozzle needle seat is a nozzle needle seat.
  • a nozzle body for a nozzle assembly of a fuel injector has a nozzle bore for a nozzle needle.
  • the nozzle bore opens via a nozzle needle seat for a sealing surface of a nozzle needle tip of the nozzle needle in a blind hole into which a pin of the nozzle needle tip can be immersed.
  • the nozzle bore has a cylinder section downstream of the nozzle needle seat.
  • the cylinder portion may, for. B. part of a paragraph inside of a wall of the nozzle body.
  • the shoulder is designed as a step, via which the nozzle needle seat merges into a longitudinal direction of the nozzle body, into a wall of the blind hole. Ie. In such an embodiment, the nozzle needle seat goes over one
  • Edge in the cylinder portion this over an edge in a substantially to the longitudinal direction of the nozzle body arranged at right angles section and this in turn Ü over an edge in the blind hole over.
  • a respective edge can be sharp-edged or reworked.
  • the cylinder section according to the invention between the nozzle needle seat and the subsequent blind hole, without providing a shoulder within the wall of the nozzle body.
  • the nozzle needle seat goes over an edge in the cylinder portion and this in turn via an edge in the wall of the blind hole.
  • the respective edge can again be formed sharp-edged or post-processed.
  • a nozzle assembly for a fuel injector on a nozzle needle which is guided movably in a nozzle bore of a nozzle body and can be brought sealingly to the system with a sealing surface provided on the nozzle needle seat of the nozzle body.
  • a transition region from the shower needle seat to the blind hole a paragraph is provided.
  • the nozzle bore may be located downstream of the shoulder in a blind hole.
  • the nozzle needle it is then preferred for the nozzle needle to have a pin on its nozzle needle tip which can be dipped into the blind hole, with an outer contour of the pin being designed to be similar or substantially congruent to an inner contour of the blind hole.
  • the respective edges of the paragraph - ie the one with the Dusennadelsitz, the blind hole, and the edge within the paragraph - may in turn be sharp-edged or refinished.
  • the nozzle needle seat is truncated cone-shaped and / or the blind hole is conically formed in the interior.
  • an intersecting edge between the nozzle needle seat and the cylinder portion or the paragraph results from an intersection between a cone with a cylinder.
  • an intersecting edge between the cylinder section or the shoulder and the blind hole results from an intersection between a cylinder with a cone.
  • An inventive Kraftstoffinjektor in particular an inventive common rail fuel injector, for a Combustion chamber of an internal combustion engine, comprising a nozzle body according to the invention in a nozzle assembly, or a nozzle assembly according to the invention, and an injector, wherein the nozzle assembly and the Injektorbaueria are preferably fixed by means of a nozzle lock nut to each other.
  • a nozzle needle seat and downstream of the nozzle needle seat subsequent paragraph or cylinder section in or on a wall of the nozzle body are provided temporally after insertion of a needle bore, a nozzle needle seat and downstream of the nozzle needle seat subsequent paragraph or cylinder section in or on a wall of the nozzle body.
  • a blind hole is provided in the nozzle body, in which the needle bore of the nozzle body ends.
  • the nozzle needle seat can be ground and / or other finishing steps are made. Ie. the corresponding sections of the nozzle bore have a corresponding allowance in time after their introduction into the nozzle body.
  • the said sections of the nozzle bore can be made with individual tools, or a plurality of tools can be combined in a single tool. So it is z.
  • the invention can - with the assumption of dimensionally accurate nozzle needles - a defined and reproducible designed hydraulic diameter between the Dusenna- del, and the transition region between the sealing seat for the nozzle needle and the blind hole to be ensured.
  • the solution according to the invention can be applied quickly and cost-effectively, since it can be introduced into the nozzle body in an existing clamping (machining center) on the one hand; and on the other hand, they do not or only slightly increased manufacturing costs for the Dusenkorper, since only an additional portion of a bore or a milling is used.
  • This section can be provided by means of a redesigned tool without an additional processing step in Dusenkorper.
  • a high level of measurement and process control effort required in the prior art eliminates the need to make a transition from the nozzle needle seat to the blind bore wall, since comparatively tight tolerances are required to achieve satisfactory hydraulic cross-over diameter results. Ie. also that less rejects caused by non-dimensional parts.
  • the invention does not require any further adjustments to an existing design of a fuel injector, i. H. the invention is applicable without additional intervention on a previous construction of a fuel injector.
  • the design change according to the invention results in a length of the nozzle needle seat that is constant from injection nozzle to injection nozzle. This results in an identical bearing surface for the nozzle needle for all injection nozzles, and thus a constant seat wear of injection nozzles of a set under identical operating conditions. This can minimize the effects of nozzle needle seat wear on injection quantity differences of fuel injectors in a set. Ie. the aging Processes of all fuel injectors of a set can thus be better predicted and better compensated by a correspondingly changed activation, which minimizes fleet consumption and the pollutant emissions of correspondingly equipped motor vehicles.
  • Fig. 1 is a central sectional view of an embodiment of a fuel injector according to the invention
  • 2 shows a central sectional view of a free end section of a nozzle assembly with a nozzle body according to the prior art, for a fuel injector
  • Fig. 3 is a central sectional view of a free end portion of a nozzle assembly with a nozzle body according to the invention, for a fuel injector.
  • a common rail fuel injector 1 comprising a nozzle assembly 2 and an injector assembly 5.
  • the nozzle assembly 2 and the Injektorbauxx 5 are fixed fluid-tight by means of a nozzle lock nut 6 together.
  • the invention should not be limited to a common rail fuel injector 1, but to all fuel injectors 1, such. As a pump-nozzle fuel injector, be applicable.
  • the injector assembly 5 has an injector body 50 on or in which an actuator 51 is provided.
  • the actuator 51 is preferably designed as a piezoelectric actuator 51, z. B., however, be designed as an electromagnetic actuator 51.
  • the actuator 51 can be equipped with a mechanical or hydraulic see transformer (not shown in the drawing) to be connected, which is arranged in the Injektorkorper 50. The actuator 51 and the transmitter then form an actuator.
  • the Injektorkorper 50 further includes a high-pressure side fluid port 52 for a fuel to be injected, wherein the fluid port 52 is hydraulically coupled to a high-pressure line 53 formed in Injektorkorper 50.
  • a high-pressure line 53 formed in Injektorkorper 50.
  • the high-pressure line 53 supplies a control chamber 56 formed in the injector body 50 and the nozzle assembly 2 (see below) with fuel under high-pressure fluid.
  • a valve member 57 is provided, which is in a mechanical connection with the actuator 51.
  • the control chamber 56 is hydraulically coupled or decoupled with a low-pressure region of the fuel injector 1.
  • the pressure in the control chamber 56 acts via a piston 58 and a pressure piston 60 via an end face 32 on a nozzle needle 30 of the nozzle assembly 2 a.
  • the end face 32 of the nozzle needle 30 facing away from a Dusennadelsitz 262 and a sealing surface 362 and a sealing cone 362 of the nozzle needle 30.
  • the nozzle needle 30 is pressed either directly or, as shown in the drawing, over the pressure piston 60 in the direction of its nozzle needle seat 26 via a nozzle needle spring 55 arranged in a spring chamber 54 of the injector body 21 in order to be securely closed when the high fluid pressure is not present ,
  • the piston 58 with the pressure piston 60 materially integrally formed.
  • the nozzle assembly 2 of the fuel injector 1 has a nozzle body 20 with a nozzle bore 22, and an annular space 25 on the nozzle bore 22, wherein in the nozzle bore 22, preferably preferably integrally formed nozzle needle 30 is guided displaceably.
  • the formed in the nozzle body 20 and the nozzle needle 30 in the region of its nozzle needle shoulder 35 surrounding annular space 25 is hydraulically connected to the high pressure line 53 of the injector body 50, which, in a concern of fluid high pressure at the high pressure port 52, in the annular space 25 is substantially always the fluid high pressure applied.
  • the nozzle needle 30 is either pressed into its nozzle needle seat 262 (valve member 57 in the closed position, in the control chamber 56, fluid high pressure prevails) or moves, if the control chamber 56 is hydraulically connected to the low pressure region of the fuel injector 1 (valve member 57th in an open position, in the control chamber 56 no fluid high pressure prevails), due to the fluid high pressure in the annulus 25 and the nozzle needle shoulder formed at her 35 from her nozzle needle seat 262, whereby fuel through at least one injection hole 268 (see Fig. 2 or 3) of an injection nozzle 200th of the fuel injector 1 can be injected into a combustion chamber 7 of an internal combustion engine.
  • the nozzle needle 30 comprises a needle piston 36, which merges into the guide piston 34 via the nozzle needle shoulder 35.
  • the needle piston 36 is located in a needle shaft 27 of the nozzle body 11, wherein between the needle shaft 27 and the needle piston 36, a needle gap 46 is formed in the nozzle bore 22, the essentially allows unthrottled supply of fuel to the nozzle needle seat 262.
  • the part of the nozzle bore 22, in which the needle piston 36 is arranged, is also referred to as a needle bore 26.
  • the guide piston 34 of the nozzle needle 30 is guided or mounted in a guide shaft 23 of the nozzle body 20, wherein a mecanicsdichtspalt 44 is formed between the nozzle bore 22 of the guide shaft 23 and the guide piston 34, only a throttled passage of fuel from the annular space 25 to the low pressure region and from there to a low pressure side fluid port 59 of the fuel injector 1 allows.
  • the part of the nozzle bore 22, in which the guide piston 34 is arranged, is also referred to as a guide bore 24.
  • a lifting movement of the actuator 51 can be amplified by means of a mechanical or by a hydraulic lever.
  • the nozzle needle 30 is guided at a middle section in the vicinity of its end face 32, wherein the end face 32 of the nozzle needle 30 is closed by means of a pressure bell.
  • the nozzle needle 30 is preferably actuated by a lever.
  • the nozzle bore 22 extending through the annular space 25 and the needle bore 26 terminates in a base 269 of a blind hole 266.
  • the nozzle needle 30 is guided essentially completely in the nozzle bore 22 of the nozzle body 20, with a preferably conical blind hole 266 being preferred Conical pin 366 of the nozzle needle tip 360 is immersed to minimize a dead volume of the blind hole 266.
  • an outer surface of the pin 366 is adapted to an inner surface of the blind hole 266, i. H. a volume of the pin 366 is slightly smaller than a volume of the blind hole 266. In a closed position of the nozzle needle 30 of the pin 366 preferably fully immersed in the blind hole 266 a.
  • An intersecting edge 265 of Dusennadelsitz 262 and an incipient wall 267 of the blind hole 266 may In this case, in the state of the art shown in FIG. 2, they lie in an intersection region 202, which is also illustrated by a double arrow on the right in FIG. Ie. Depending on the production conditions, this intersecting edge 265 is more or less further away from the bottom of the blind hole 266.
  • This intersecting edge 265 resulting from intersection of two cones is based on different manufacturing steps and influences a resulting hydraulic diameter between the nozzle needle tip 360 and a corresponding portion of the nozzle bore 22 in the intersection region 202. This, in turn, affects a function of the injection nozzle 200, in particular with respect to FIG injected fuel quantities and their temporal opening behavior. This problem exists in particular for all variants of injection nozzles 200 with a conical blind hole 266, irrespective of an angle of the nozzle needle seat 262.
  • a transition contour from the nozzle needle seat 262 into the wall 267 of the blind hole 2666 is designed according to the invention, it is possible to influence or define a shape of a hydraulic flow curve. According to the invention, this is done by a cylinder portion 264 located downstream of the nozzle needle seat 262, wherein it is preferred that the cylinder portion 264 directly adjoin the nozzle needle seat 262 downstream.
  • the cylinder portion 264 may be part of a shoulder 264 (see FIG.
  • a central bore is first introduced into the nozzle body 20 as a blind hole.
  • This center bore is in the area of the later needle bore 26, apart from a fine machining, substantially identical to the later needle bore 26.
  • the center bore is about 80% of the later length of the nozzle bore 22 in the nozzle body 20.
  • the latter processing step can also be carried out by a plurality of tools.
  • a single or a plurality of other processing steps not essential to the invention can take place.
  • the height H of the cylinder portion 264 is preferably in a range of a few microns to half a millimeter.
  • a bleeding edge between the nozzle needle seat and the shoulder or the cylinder portion, and / or a bleeding edge between the shoulder or the cylinder portion and the beginning blind hole separately edited, preferably rounded, or not edited.

Landscapes

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

Abstract

L'invention concerne un corps de buse (20) pour un ensemble buse (2) d'un injecteur de carburant (1), en particulier d'un injecteur de carburant à rampe commune (1), comprenant un alésage d'aiguille (26, 22) pour un piston (36) d'une aiguille de buse (30). L'alésage d'aiguille (26) passe par un siège d'aiguille de buse (262) pour une surface d'étanchéité (362) d'une pointe (360) de l'aiguille de buse (30) et débouche dans un trou borgne (266), dans lequel un téton (366) de la pointe d'aiguille de buse (360) peut être plongé, une saillie (264) étant agencée dans une zone de transition (202) du siège d'aiguille de buse (262) au trou borgne (266). En outre, l'invention concerne un procédé de réalisation d'un alésage de buse (22) dans un corps de buse (20) d'un injecteur de carburant (1), en particulier d'un injecteur de carburant à rampe commune (1).
EP09780310A 2008-08-27 2009-07-08 Corps de buse, ensemble buse et injecteur de carburant, et procédé de fabrication d'un corps de buse Ceased EP2318688A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008039920A DE102008039920A1 (de) 2008-08-27 2008-08-27 Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
PCT/EP2009/058662 WO2010023016A1 (fr) 2008-08-27 2009-07-08 Corps de buse, ensemble buse et injecteur de carburant, et procédé de fabrication d’un corps de buse

Publications (1)

Publication Number Publication Date
EP2318688A1 true EP2318688A1 (fr) 2011-05-11

Family

ID=41119512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780310A Ceased EP2318688A1 (fr) 2008-08-27 2009-07-08 Corps de buse, ensemble buse et injecteur de carburant, et procédé de fabrication d'un corps de buse

Country Status (5)

Country Link
US (1) US20110180634A1 (fr)
EP (1) EP2318688A1 (fr)
CN (1) CN102132030A (fr)
DE (1) DE102008039920A1 (fr)
WO (1) WO2010023016A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102009042155A1 (de) * 2009-09-21 2011-04-07 Continental Automotive Gmbh Kraftstoff-Einspritzventil für eine Brennkraftmaschine
DE102010014208A1 (de) * 2010-04-08 2011-10-13 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben eines Einspritzventils
US9133802B2 (en) * 2013-05-09 2015-09-15 Caterpillar Inc. Device for sealing orifices on nozzle of fuel injector for autofrettage process
DE102013212142A1 (de) 2013-06-25 2015-01-08 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
EP2905457B1 (fr) 2014-01-15 2018-08-29 Continental Automotive GmbH Ensemble de soupape et injecteur de fluide pour moteur à combustion
JP6329867B2 (ja) * 2014-09-17 2018-05-23 株式会社Ｓｏｋｅｎ 燃料噴射ノズル
DE102015214306A1 (de) * 2015-07-29 2017-02-02 Continental Automotive Gmbh Verfahren zum Herstellen eines Düsenkörpers für ein Fluideinspritzventil und Fluideinspritzventil
DE102016215637A1 (de) * 2016-08-19 2018-02-22 Robert Bosch Gmbh Kraftstoffeinspritzdüse
CN106968857B (zh) * 2017-04-14 2023-02-28 无锡职业技术学院 汽油机喷油器喷嘴
CN111136561A (zh) * 2018-11-01 2020-05-12 康明斯公司 用于燃料喷射部件的带抛光方法及装置
DE102019103511A1 (de) * 2019-02-12 2020-08-13 Liebherr-Components Deggendorf Gmbh Düse für einen Kraftstoffinjektor
CN110434565B (zh) * 2019-09-17 2021-02-12 哈尔滨汽轮机厂有限责任公司 一种燃气轮机用多孔结构喷嘴孔加工方法
DE102019220072A1 (de) * 2019-12-18 2021-06-24 Robert Bosch Gmbh Einspritzdüse zur Einspritzung von Kraftstoff unter hohem Druck

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DE10038098A1 (de) * 2000-08-04 2002-02-14 Bosch Gmbh Robert Brennstoffeinspritzventil
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Also Published As

Publication number Publication date
US20110180634A1 (en) 2011-07-28
CN102132030A (zh) 2011-07-20
DE102008039920A1 (de) 2010-03-04
WO2010023016A1 (fr) 2010-03-04

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