EP3234346A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant

Info

Publication number
EP3234346A1
EP3234346A1 EP15784719.5A EP15784719A EP3234346A1 EP 3234346 A1 EP3234346 A1 EP 3234346A1 EP 15784719 A EP15784719 A EP 15784719A EP 3234346 A1 EP3234346 A1 EP 3234346A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
injection device
decoupling element
receiving 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.)
Granted
Application number
EP15784719.5A
Other languages
German (de)
English (en)
Other versions
EP3234346B1 (fr
Inventor
Johann Bayer
Wilhelm Reinhardt
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 EP3234346A1 publication Critical patent/EP3234346A1/fr
Application granted granted Critical
Publication of EP3234346B1 publication Critical patent/EP3234346B1/fr
Active 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a fuel injection device according to the preamble of the main claim.
  • Fuel injection device shown in which a flat intermediate element is provided on a built-in a receiving bore of a cylinder head of an internal combustion engine fuel injection valve.
  • such intermediate elements are stored as support elements in the form of a washer on a shoulder of the receiving bore of the cylinder head.
  • the fuel injector is particularly suitable for use in fuel injection systems of
  • the intermediate element is a lower ring having a circular cross section which is disposed in a region in which both the fuel injection valve and the wall of the receiving bore in the cylinder head are frustoconical and serves as a compensation element for supporting and supporting the fuel injection valve.
  • Fuel injection devices are inter alia also from DE 100 27 662 AI, DE 100 38 763 AI and EP 1 223 337 AI known. These intermediate elements are characterized by the fact that they are all constructed in several parts or multi-layered and should partially take over sealing and damping functions. That from the
  • AI known intermediate element comprises a base and carrier body in which a sealant is inserted, which is penetrated by a nozzle body of the fuel injection valve.
  • a multilayer compensating element is known, consisting of two rigid rings and a sandwich between them
  • This compensating element allows both a tilting of the fuel injection valve to the axis of the
  • a likewise multi-layer intermediate element is also known from EP 1 223 337 AI, this intermediate element is composed of several washers, which consist of a damping material.
  • the damping material made of metal, rubber or PTFE is chosen and designed so that a noise attenuation of the vibrations generated by the operation of the fuel injection valve and noise is made possible.
  • the intermediate element must, however, include four to six layers to achieve a desired damping effect.
  • US 6,009,856 A also proposes to surround the fuel injector with a sleeve and to fill the resulting gap with an elastic, noise-damping mass. This kind of
  • the fuel injection device with the characterizing features of claim 1 has the advantage that very easy and inexpensive a captive for the decoupling element on the fuel injection valve can be applied, whereby slipping of the decoupling element is excluded prior to assembly of the fuel injection valve in the receiving bore.
  • the captive is inventively taken over by a compact, massive and yet filigree retaining ring, which is arranged below the decoupling element on the outer circumference of the fuel injection valve.
  • the retaining ring is distinguished by a particularly high degree of functional integration, since functional areas projecting in different directions are formed on the retaining ring, which represents a solid component.
  • Fuel injection device possible.
  • the decoupling element is characterized by a low height, which means that it can be used even in a small space.
  • the decoupling element also has a high fatigue strength even at high temperatures.
  • the decoupling element is
  • Figure 1 is a partially illustrated fuel injection device in a known
  • Figure 2 is a mechanical equivalent circuit diagram of the support of
  • Fuel injector in the cylinder head in direct fuel injection which represents a common spring mass damper system
  • FIG. 3 shows the transmission behavior of a spring mass damper shown in FIG.
  • FIG. 5 shows a detailed view V from FIG. 4 and FIG. 5
  • FIGS. 6 and 7 show an alternative embodiment of a securing ring according to the invention, wherein Figure 6 shows the installation situation in a view analogous to Figure 5 and Figure 7 shows the locking ring as a single component in an oblique plan view. Description of the embodiments
  • FIG. 1 is as an embodiment, a valve in the form of an injection valve 1 for
  • the fuel injection valve 1 is part of the fuel injection device. This is with a downstream end
  • Fuel injection valve 1 which is designed in the form of a direct-injection injector for direct injection of fuel into a combustion chamber 25 of the internal combustion engine, installed in a receiving bore 20 of a cylinder head 9.
  • a sealing ring 2 in particular made of Teflon TM, ensures optimum sealing of the
  • Cylinder Head 9 Between a shoulder 21 of a valve housing 22 and a e.g. at right angles to
  • the fuel injection valve 1 has at its inlet-side end 3 a plug connection to a fuel distributor line (fuel rail) 4, which is sealed by a sealing ring 5 between a connection piece 6 of the fuel distributor line 4, which is shown in section, and an inlet connection 7 of the fuel injection valve 1.
  • Fuel injection valve 1 is inserted into a receiving opening 12 of the connection piece 6 of the fuel distribution line 4.
  • the connecting piece 6 is in this case e.g. in one piece from the actual fuel distributor line 4 and has upstream of the receiving opening 12 a smaller diameter flow opening 15 through which the
  • the fuel injection valve 1 has via an electrical connection plug 8 for the electrical contacting for actuating the fuel injection valve 1.
  • a holding-down device 10 is provided between the fuel injection valve 1 and the connecting piece 6.
  • the hold-down 10 is designed as a bow-shaped component, e.g. as punching-bending part.
  • the hold-down device 10 has a part-ring-shaped base element 11, from which a hold-down bar 13 extends, which abuts against a downstream end face 14 of the connecting piece 6 on the fuel distributor line 4 in the installed state.
  • Idle operation can be achieved by a targeted design and geometry of the intermediate element 24, and on the other hand should be easy and inexpensive tolerance compensation, which allows tilting of the fuel injection valve by up to 1 °, and a lateral force-free operation under temperature influence allows.
  • the relevant noise source of the fuel injection valve 1 in the direct high-pressure injection are introduced during the valve operation in the cylinder head 9 forces (structure-borne sound), which lead to a structural excitation of the cylinder head 9 and are emitted from this as airborne sound.
  • a minimization of the introduced into the cylinder head 9 forces should be sought. In addition to reducing the forces caused by the injection, this can be done by influencing the
  • the bearing of the fuel injection valve 1 can be mapped on the passive intermediate member 24 in the receiving bore 20 of the cylinder head 9 as a conventional spring-mass damper system, as shown in Figure 2.
  • the mass M of the cylinder head 9 can be assumed to be infinite compared to the mass m of the fuel injection valve 1 in the first approximation.
  • the transmission behavior of such a system is characterized by a gain at low frequencies in the range of the resonant frequency f R and an isolation range above the decoupling frequency f E (see FIG. 3).
  • Fuel injection valve 1 during engine operation difficult.
  • the vehicle typically experiences the following quasi-static load conditions:
  • the decoupling element 25 is further designed with its cushion-like cross-section over its annular course that a lower, e.g. largely flat end face 26 is provided, which rests on a shoulder 23 of the receiving bore 20 in the cylinder head 9, and an upper end face 27 is provided which extends from radially outward to radially inwardly rising conical contact and contact with a spherically curved shoulder surface 21 of the valve housing 22 of the Fuel injection valve 1 has.
  • FIG. 4 shows a cross section through a decoupling element 25 in a mounting situation on a fuel injection valve 1 in the region of the disc-shaped intermediate element 24 shown in FIG
  • Decoupling element 25 is replaced.
  • Fuel injector 1 arranged by a retaining ring 29 below the
  • Decoupling element 25 is applied to the outer circumference of the fuel injection valve 1.
  • the retaining ring 29 is a closed plastic ring.
  • Circlip 29 is characterized as a solid component, which is made small and compact and has projecting in different directions functional areas.
  • the decoupling element 25 must be secured captive on the fuel injector 1 to allow a common assembly and disassembly of fuel injector 1 and decoupling element 25 at the OEM in the cylinder head 9 of the internal combustion engine. This way, the OEM only has to handle one overall assembly.
  • the decoupling element 25 and the retaining ring 29 are shown as a section V of Figure 4 in Figure 5.
  • the radially furthest inward functional area is a Haitee Scheme 30, which corresponds to a groove 31 introduced on the valve housing 22. Starting from the holding region 30 extends in the direction of the decoupling element 25 pointing oblique region 32 with a
  • Insertion bevel which should fulfill a Vorpositionierfunktion.
  • the radially outermost functional region is a securing region 33, which engages radially as far as the decoupling element 25 (with a small axial distance, at least in the installed state), such that the decoupling element 25 slips off
  • Fuel injection valve 1 is excluded before its installation in the receiving bore 20.
  • a downwardly projecting functional area is a centering area 34, which has an annular collar-like design and bears against the valve housing 22 with a clearance fit.
  • the locking ring 29 is just as compact and in his
  • Fuel injection valve 1 no contact between the wall of the receiving bore 20 of the cylinder head 9 and the retaining ring 29 is formed. This would again lead to a transverse force input to the fuel injection valve 1 and thus to undesirable bending. In addition, a secure holding the locking ring 29 would be on
  • Fuel injector 1 no longer guaranteed over the entire life.
  • the retaining ring 29 made of plastic is prior to its mounting on the
  • Fuel injector 1 conditioned.
  • the plastic is targeted with e.g. Water enriched to swell. This increases its ductility without cracks or the like. arise in the structure of the plastic.
  • the retaining ring 29 is stretched over a collar 37 on the valve housing 22. The resulting load is due to the specially conditioned state for the retaining ring 29 compatible.
  • the assembly process has to be safe and reliable
  • a provided over the insertion short cylindrical section on the collar 37 helps to prevent inversion of the retaining ring 29 during mounting safely.
  • the circlip is provided with the oblique portion 32 having an insertion slope of e.g. 45 °.
  • Valve housing 22 introduced groove 31 ensures that the inclined portion 32 following holding portion 30 is caught, so that prevents that in the installed state no Otherwise, the pivoting capability of the fuel injection valve 1 would be significantly restricted, in the mounted state, the circlip 29 is designed with pressure in the groove 31, ie the maximum inner diameter of the circlip 29 is smaller After mounting the unit fuel injector 1 / decoupling element 25 / retaining ring 29 in the receiving bore 20, the plastic will reduce its moisture content back to its original level, whereby the interference fit on the fuel injector 1 is increased again.
  • the decoupling element 25 on its upper side, the conical or conical end face 27, which corresponds in the installed state with the convex spherical or convex, convex shoulder surface 21 of the valve housing 22 of the fuel injector 1.
  • the shoulder surface 21 of the valve housing 22 is formed on a radially outwardly projecting shoulder 28.
  • the shoulder surface 21 of the valve housing 22 does not have to be continuously curved in a spherical manner; It suffices such a shape in the contact area with the conical
  • the respective transitions of the upper end face 27 and the lower end face 26 to the two inner and outer annular surface areas of the decoupling element 25 may be rounded.
  • the geometry with a shallow angle or a large radius of the curvature on the spherically curved shoulder surface 21 of the valve housing 22 and the conical or tapered end face 27 of the decoupling element 25 allows in conjunction with a relatively large clearance radially inward toward the fuel injector 1 and with a small clearance radially outward to the wall of the receiving bore 20 toward the
  • Such a decoupling element 25 is inexpensive to manufacture and decouples the structure-borne noise in the desired manner. Together with the slightly convex curved shoulder surface 21 of the valve housing 22 results in a pivotable or tiltable connection for tolerance compensation. When offset between the fuel injection valve 1 and the receiving bore 20 within the tolerated manufacturing fluctuations, it may lead to a slight tilting of the fuel injection valve 1. Due to the pivotal connection between the fuel injection valve 1 and the decoupling element 25 then lateral forces are largely avoided in a misalignment of the fuel injection valve 1.
  • FIG. 6 shows the mounting situation and Figure 7 shows the retaining ring 29 as a single component in an oblique plan view.
  • This version of the locking ring 29 is a compact, solid, closed plastic ring.
  • This variant of the locking ring 29 advantageously offers the possibility of undirected assembly in the factory of the fuel injector 1.
  • the retaining ring 29 due to its formed as an oblique region 32 Rad ierfase be fed in a directional form in the assembly line, which leads to a certain susceptibility to errors.
  • the retaining ring 29 is executed on its top and bottom quasi symmetrical. Therefore, it does not matter in which position the retaining ring 29 is mounted on the fuel injection valve 1. He behaves the same in terms of installation and function in both directions. Similar to the ring-collar-like centering region 34 of the first embodiment, ring-shaped web regions 42 protrude upwards and downwards from the main body of the securing ring 29, of which e.g. six spaced apart over the entire ring are formed. The retaining ring 29 is constructed on the bottom and top only quasi symmetrical, since the interrupted web portions 42, the one easy

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

Le dispositif d'injection de carburant selon l'invention est caractérisé en particulier en ce qu'il présente une structure silencieuse pivotante. Le dispositif d'injection de carburant comprend au moins un injecteur de carburant (1) et un orifice de réception (20) ménagé dans une culasse (9) pour l'injecteur de carburant (1), ainsi qu'un élément de désaccouplement (25) situé entre un carter (22) de l'injecteur (1) et une paroi de l'orifice de réception (20). L'élément de désaccouplement (25) est ainsi fixé imperdable à l'injecteur de carburant (1) avant son montage dans l'orifice de réception (20), par montage d'un anneau de sécurité (29) au-dessous de l'élément de désaccouplement (25) sur la périphérie extérieure de l'injecteur de carburant (1), l'anneau de sécurité (29) étant un anneau fermé en matière plastique. Le dispositif d'injection de carburant convient en particulier pour l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne à allumage commandé et à compression du mélange.
EP15784719.5A 2014-12-16 2015-10-26 Dispositif d'injection de carburant Active EP3234346B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225976.2A DE102014225976A1 (de) 2014-12-16 2014-12-16 Brennstoffeinspritzvorrichtung
PCT/EP2015/074702 WO2016096204A1 (fr) 2014-12-16 2015-10-26 Dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP3234346A1 true EP3234346A1 (fr) 2017-10-25
EP3234346B1 EP3234346B1 (fr) 2020-03-18

Family

ID=54347557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15784719.5A Active EP3234346B1 (fr) 2014-12-16 2015-10-26 Dispositif d'injection de carburant

Country Status (7)

Country Link
US (1) US10197033B2 (fr)
EP (1) EP3234346B1 (fr)
JP (1) JP6553725B2 (fr)
KR (1) KR102476866B1 (fr)
CN (1) CN107110098B (fr)
DE (1) DE102014225976A1 (fr)
WO (1) WO2016096204A1 (fr)

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JP7156772B2 (ja) * 2016-01-29 2022-10-19 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 燃料噴射弁及び燃料噴射装置
DE102016225706A1 (de) * 2016-12-21 2018-06-21 Robert Bosch Gmbh Ventil zum Zumessen eines Fluids
DE102016225957A1 (de) * 2016-12-22 2018-06-28 Robert Bosch Gmbh Injektor mit verbesserter Sicherung
DE102017218008A1 (de) * 2017-10-10 2019-04-11 Robert Bosch Gmbh Entkopplungselement für eine Brennstoffeinspritzvorrichtung
DE102018200335A1 (de) * 2018-01-11 2019-07-11 Robert Bosch Gmbh Brennstoffeinspritzvorrichtung
DE102018220945A1 (de) * 2018-12-04 2020-06-04 Robert Bosch Gmbh Brennstoffeinspritzventil
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US10746145B1 (en) * 2019-05-08 2020-08-18 Delphi Technologies Ip Limited Isolator for fuel injector
US10801457B1 (en) 2019-07-03 2020-10-13 Delphi Technologies Ip Limited Fuel rail assembly providing connection to a fuel injector
US11454200B2 (en) 2019-11-08 2022-09-27 Delphi Technologies Ip Limited Fuel system with an arrangement which seals between a fuel injector and a fuel rail socket
US11352992B2 (en) 2020-02-12 2022-06-07 Delphi Technologies Ip Limited Fuel injector
US10995716B1 (en) 2020-02-21 2021-05-04 Delphi Technologies Ip Limited Fuel system having a connection between a fuel injector and a fuel distribution conduit
US11143154B2 (en) 2020-03-13 2021-10-12 Delphi Technologies Ip Limited Fuel system having a connection between a fuel injector and a fuel distribution conduit
US10995720B1 (en) 2020-07-29 2021-05-04 Delphi Technologies Ip Limited Fuel system having a connection between a fuel injector and a fuel distribution conduit
US11873786B2 (en) * 2021-10-19 2024-01-16 Stanadyne Operating Company Llc Axisymmetric injector hold-down load ring

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Also Published As

Publication number Publication date
CN107110098B (zh) 2020-05-26
JP2018500500A (ja) 2018-01-11
US20170350358A1 (en) 2017-12-07
KR20170097039A (ko) 2017-08-25
KR102476866B1 (ko) 2022-12-14
DE102014225976A1 (de) 2016-06-16
US10197033B2 (en) 2019-02-05
EP3234346B1 (fr) 2020-03-18
JP6553725B2 (ja) 2019-07-31
WO2016096204A1 (fr) 2016-06-23
CN107110098A (zh) 2017-08-29

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