EP2839142B1 - Élément d'isolation en plusieurs parties, en particulier pour un dispositif d'injection de carburant - Google Patents

Élément d'isolation en plusieurs parties, en particulier pour un dispositif d'injection de carburant Download PDF

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Publication number
EP2839142B1
EP2839142B1 EP13712533.2A EP13712533A EP2839142B1 EP 2839142 B1 EP2839142 B1 EP 2839142B1 EP 13712533 A EP13712533 A EP 13712533A EP 2839142 B1 EP2839142 B1 EP 2839142B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
ring
insulation
insulation element
outer ring
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.)
Active
Application number
EP13712533.2A
Other languages
German (de)
English (en)
Other versions
EP2839142A1 (fr
Inventor
Martin Kochanowski
Jason Kramer
Martin Scheffel
Thomas Froehner
Markus Friedrich
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
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Filing date
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Publication of EP2839142A1 publication Critical patent/EP2839142A1/fr
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Publication of EP2839142B1 publication Critical patent/EP2839142B1/fr
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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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • 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
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9023—Fibrous materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals

Definitions

  • the invention relates to a multi-part insulating element, in particular for a fuel injection device according to the preamble of the main claim.
  • FIG. 1 By way of example, a fuel injector known from the prior art is shown in which a flat intermediate element is provided on a fuel injection valve installed in a receiving bore of a cylinder head of an internal combustion engine.
  • 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.
  • manufacturing and assembly tolerances are compensated and ensured a lateral force-free storage even with slight misalignment of the fuel injector.
  • the fuel injector is particularly suitable for use in fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • 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 compensating element for supporting and supporting the fuel injection valve.
  • Complicated and in the production significantly more expensive intermediate elements for fuel injection devices include the DE 100 27 662 A1 .
  • 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 DE 100 27 662 A1 known intermediate element comprises a base and carrier body, in which a sealing means is used, which is penetrated by a nozzle body of the fuel injection valve.
  • a multi-layer compensating element is known, which is composed of two rigid rings and sandwiched therebetween elastic intermediate ring. This compensating element allows both a tilting of the fuel injection valve to the axis of the receiving bore over a relatively large angular range as well as a radial displacement of the fuel injection valve from the central axis of the receiving bore.
  • a likewise multi-layered intermediate element is also from the EP 1 223 337 A1 known, this intermediate element is composed of a plurality of 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.
  • Entkopplungs- or damping elements for fuel injection devices which are characterized in that they are made of several parts, wherein an inner metal cushion is encapsulated as a wire mesh, knitted or knitted fabric in outer rings.
  • An inner ring of the decoupling or damping element always comes to rest on the fuel injection valve, while an outer ring of the decoupling or damping element rests against a shoulder of a receiving bore of the cylinder head.
  • Outer and inner ring are each simple, rectangular in cross-section sheet metal rings with L-profile.
  • the insulation element according to the invention for a fuel injection device with the characterizing features of claim 1 has the advantage that in a very simple construction, an improved noise attenuation is achieved.
  • the insulation element has a non-linear, progressive spring characteristic, resulting in several positive and advantageous aspects when installing the insulation element in a fuel injection device with injectors for direct fuel injection.
  • the insulation element according to the invention has the advantage that the support of the outer ring on the insulating ring reduces the deflection of the outer ring compared to the known solutions and leads to a greater rigidity of the outer ring.
  • a high rigidity of the outer ring in turn allows a design of the spring characteristic alone on the insulation ring of a wire mesh with significantly lower rigidity.
  • the combination of these two components makes it possible to ideally produce the desired progressive spring characteristic (low rigidity at low operating pressures / loads, high rigidity at high system pressures).
  • the stresses on possibly set for securing welds between outer ring and insulation ring or between inner ring and insulation ring can be reduced.
  • the bending stress of the individual components of the multi-part insulation element is reduced overall.
  • the multi-part isolation element With the multi-part isolation element according to the invention, an excellent reduction of the injector-induced noise during fuel injection is achieved by reducing the power transmission from the fuel injection valve to the cylinder head in the relevant frequency range.
  • the elastic insulation element has both insulation and damping properties. A precise positioning of the fuel injection valve with respect to the cylinder head with very small tolerances and low load on the valve seals (to the combustion chamber or to the fuel rail) is possible.
  • the isolation element allows repeatable elastic deformation of the isolation element over the entire injector life without plastic deformation occurring.
  • the isolation system allows for maximization of the isolation function when restricting the injector movement.
  • the spring characteristic of the insulation element according to the invention can be specifically designed to be progressively progressive by adapting the geometric parameters, in particular of the insulation ring.
  • FIG. 1 a valve in the form of an injection valve 1 for fuel injection systems of mixture-compression spark-ignited internal combustion engines in a side view.
  • the fuel injection valve 1 is part of the fuel injection device.
  • a sealing ring 2 in particular of Teflon®, ensures optimum sealing of the fuel injection valve 1 with respect to the wall of the receiving bore 20 of the cylinder head 9.
  • a flat intermediate element 24 is inserted, which is designed as a support element in the form of a washer.
  • 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.
  • the 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 flow of the fuel injection valve 1 takes place.
  • the fuel injection valve 1 has 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.
  • the object of the invention is compared to the known Bacettiticiansen in a simple manner improved noise attenuation, especially in noise-critical idling operation, by a targeted interpretation and geometry of the intermediate element 24 to reach.
  • 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 achieved by influencing the transmission behavior between the fuel injection valve 1 and the cylinder head 9.
  • the bearing of the fuel injector 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 FIG FIG. 2 is shown.
  • 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 ).
  • the aim of the invention is the design of an intermediate element 24 under the priority use of the elastic isolation (decoupling) for noise reduction, especially in idling mode of the vehicle.
  • the invention comprises on the one hand the definition and design of a suitable spring characteristic taking into account the typical requirements and boundary conditions in direct fuel injection with variable operating pressure and on the other the design of an intermediate element 24 which is able to map the characteristic of the spring characteristic defined in this way and over a choice of simple geometric parameters can be adapted to the specific boundary conditions of the injection system.
  • a non-linear spring characteristic with a progressive profile for the insulating element 30 is proposed, as described in US Pat FIG. 4 outlined.
  • the characteristic of this spring characteristic allows a noise decoupling with the aid of a low spring stiffness (S NVH ) in idling mode and allows the rapid increase in stiffness compliance with the maximum movement of the fuel injection valve 1 between idle and system pressure.
  • the insulation element 30 In order to implement the non-linear spring characteristic under typical boundary conditions of the direct fuel injection (small space, high forces, low total movement of the fuel injection valve 1) in an optimal manner, the insulation element 30 according to the invention consists of several parts of an outer ring 31, an inner ring 32 and an insulating ring 33 constructed , wherein the insulating ring 33 enclosed by the inner ring 32 and outer ring 31 encircles encircles.
  • conventional disc springs which basically initially have only a linear or degressive characteristic curve. In conventional disc springs, a progressive course is achieved only when they are almost completely loaded on "block".
  • FIG. 5 is a partial cross section through an inventive multi-part isolation element 30, which is used in a fuel injection device shown.
  • the multipart insulation element 30 has two functional units.
  • the first functional unit is formed by the insulating ring 33.
  • the insulating ring 33 is an annular wire mesh, knitted or knitted fabric, which fulfills two functions according to the invention.
  • the primary function as previously described in detail, is to achieve the best possible isolation (decoupling) at the fuel injector via a low stiffness progressive spring characteristic under low load conditions (eg, idle, noise critical operating ranges) and high rigidity at nominal system pressure.
  • the isolation ring 33 As a secondary function of the isolation ring 33 is a damping, the is not synonymous with the isolation, since there are different physical action mechanisms, desired, which is realized via an internal friction of the wire mesh of the insulating ring 33 during the injection in micro-movements of the fuel injection valve 1.
  • the wire mesh, knitted or knitted fabric of the insulation ring 33 has, for example, a largely square cross-section.
  • the second functional unit is formed by the outer ring 31 and the inner ring 32, which together form an annular chamber for the insulating ring 33 and encapsulate it in this respect.
  • the inner ring 32 is thin-walled, e.g. formed as a sheet metal part and has on an inner side 35 an annular disk-shaped surface and on its underside 36 a cylinder head side support surface.
  • the two sides 35, 36 are largely perpendicular to each other.
  • the inner side 35 may have elastic elements 37 distributed around the circumference, e.g. executed feather pliers and ensure that the insulation element 30 is secured captive on the fuel injector 1.
  • the outer ring 31 has a greater material thickness than the inner ring 32.
  • the outer ring 31 On an outer side 38, the outer ring 31 has an annular disc-shaped surface, while on its thicker and more stable shaped upper side 39 an injector-side support surface is provided, which is spherical or spherical, convex bulging. With this support surface of the upper side 39, the insulating element 30 is located at a e.g. conically extending shoulder of the valve housing 22, so that it idealized only comes to a line contact of the corresponding component partners 1, 30.
  • FIG. 6 shows a partial cross section through an inventive insulation element 30 in a mounting situation on a fuel injection valve 1 in the region of in FIG. 1 shown disc-shaped intermediate element 24.
  • the insulation element 30 of the invention has the advantage that the support of the outer ring 31 on the insulating ring 33 reduces the deflection of the outer ring 31 compared to the known solutions and leads to a greater rigidity of the outer ring 31.
  • a high rigidity of the outer ring 31 in turn allows a design of the spring characteristic solely on the insulating ring 33 of the wire mesh with significantly lower rigidity.
  • the multi-part isolation element 30 With the multi-part isolation element 30 according to the invention, an excellent reduction of the injector-caused noise during fuel injection is achieved by reducing the power transmission from the fuel injection valve 1 to the cylinder head 9 in the relevant frequency range.
  • the elastic insulation element 30 has both insulation and damping properties. A precise positioning of the fuel injection valve 1 with respect to the cylinder head 9 with very small tolerances and low load on the valve seals (to the combustion chamber 25 and to the fuel rail 4 out) is possible.
  • the isolation member 30 allows for repeatable elastic deformation of the isolation member 30 over the entire injector life without plastic deformation occurring.
  • the isolation system allows for maximization of the isolation function when restricting the injector movement.

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

Claims (8)

  1. Élément d'isolation en plusieurs parties d'un dispositif d'injection de carburant pour systèmes d'injection de carburant de moteurs à combustion interne, en particulier servant à l'injection directe de carburant dans une chambre de combustion, le dispositif d'injection de carburant comportant au moins une soupape d'injection de carburant (1) et un alésage de réception (20) pour la soupape d'injection de carburant (1), et l'élément d'isolation (30) étant inséré entre un carter (22) de la soupape d'injection de carburant (1) et une paroi de l'alésage de réception (20), l'élément d'isolation (30) comportant une bague d'isolation intérieure (33) qui est encapsulée entre la bague extérieure (31) et une bague intérieure (32),
    la bague extérieure (31) étant orientée vers la soupape d'injection de carburant (1) et la bague intérieure (32) étant orientée vers la paroi de l'alésage de réception (20) et, à l'état monté de l'élément d'isolation (30), il se produit un appui correspondant de ces composants (31/1 ; 32/9), la bague extérieure (31) présentant, sur un côté extérieur (38) qui entoure radialement la bague d'isolation intérieure (33), une surface en forme de disque annulaire et, sur un côté supérieur (39), une surface d'appui côté injecteur,
    caractérisé en ce que
    la bague intérieure (32) est à paroi mince en tant que pièce en tôle et la bague extérieure (31) présente une plus grande épaisseur de matériau que la bague intérieure (32) et le côté supérieur (39) de la bague extérieure (31) est formé de manière plus épaisse et plus stable que le côté extérieur (38) en forme de disque annulaire de la bague extérieure (31) et la surface d'appui, côté injecteur, du côté supérieur (39) s'étendant de manière courbée de façon convexe de manière bombée ou sphérique, de telle sorte qu'au moyen de cet appui de la bague extérieure (31) sur la bague d'isolation (33), la flexion de la bague extérieure (31) est réduite et une plus grande rigidité de la bague extérieure (31) est obtenue.
  2. Élément d'isolation selon la revendication 1,
    caractérisé en ce que
    la bague d'isolation (33) est un treillis métallique, un tricot métallique ou un maillage métallique annulaire.
  3. Élément d'isolation selon la revendication 1 ou 2,
    caractérisé en ce que
    la bague intérieure (32) est à paroi mince et présente, sur un côté intérieur (35), une surface en forme de disque annulaire et, sur un côté inférieur (36), une surface d'appui plane.
  4. Élément d'isolation selon la revendication 3,
    caractérisé en ce que
    le côté intérieur (35) de la bague intérieure (32) comprend des éléments élastiques (37).
  5. Élément d'isolation selon la revendication 4,
    caractérisé en ce que
    les éléments élastiques (37) sont réalisés en forme d'agrafes élastiques.
  6. Élément d'isolation selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'au moins un cordon de soudure (40) placé à des fins de fixation est prévu entre la bague extérieure (31) et la bague d'isolation (33) et/ou entre la bague intérieure (32) et la bague d'isolation (33).
  7. Élément d'isolation selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'alésage de réception (20) pour la soupape d'injection de carburant (1) est réalisé dans une culasse (9) et l'alésage de réception (20) comporte un épaulement (23) qui s'étend perpendiculairement à l'étendue de l'alésage de réception (20) et repose sur la bague intérieure (32).
  8. Élément d'isolation selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le carter (22) de la soupape d'injection de carburant (1) est doté d'un contour extérieur conique dans une région d'appui de l'élément d'isolation (30), contour extérieur contre lequel s'appuie la bague extérieure (31).
EP13712533.2A 2012-04-16 2013-03-22 Élément d'isolation en plusieurs parties, en particulier pour un dispositif d'injection de carburant Active EP2839142B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012206194A DE102012206194A1 (de) 2012-04-16 2012-04-16 Mehrteiliges Isolationselement, insbesondere für eine Brennstoffeinspritzvorrichtung
PCT/EP2013/056166 WO2013156258A1 (fr) 2012-04-16 2013-03-22 Élément d'isolation en plusieurs parties, en particulier pour un dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2839142A1 EP2839142A1 (fr) 2015-02-25
EP2839142B1 true EP2839142B1 (fr) 2018-12-19

Family

ID=47998430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13712533.2A Active EP2839142B1 (fr) 2012-04-16 2013-03-22 Élément d'isolation en plusieurs parties, en particulier pour un dispositif d'injection de carburant

Country Status (7)

Country Link
US (1) US10648438B2 (fr)
EP (1) EP2839142B1 (fr)
JP (1) JP2015515577A (fr)
KR (1) KR102071856B1 (fr)
CN (1) CN104471234B (fr)
DE (1) DE102012206194A1 (fr)
WO (1) WO2013156258A1 (fr)

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DE102014225988A1 (de) 2014-12-16 2016-06-16 Robert Bosch Gmbh Entkopplungselement für eine Brennstoffeinspritzvorrichtung
CN107299872A (zh) * 2017-06-21 2017-10-27 重庆长安汽车股份有限公司 一种有效降低汽油直喷发动机工作噪音的喷油器支撑环
DE102017218008A1 (de) * 2017-10-10 2019-04-11 Robert Bosch Gmbh Entkopplungselement für eine Brennstoffeinspritzvorrichtung
JP7476827B2 (ja) * 2021-03-12 2024-05-01 トヨタ自動車株式会社 燃料噴射装置用制振インシュレータ

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Also Published As

Publication number Publication date
US20150059703A1 (en) 2015-03-05
US10648438B2 (en) 2020-05-12
CN104471234B (zh) 2018-01-19
EP2839142A1 (fr) 2015-02-25
DE102012206194A1 (de) 2013-10-17
KR20150001754A (ko) 2015-01-06
JP2015515577A (ja) 2015-05-28
WO2013156258A1 (fr) 2013-10-24
CN104471234A (zh) 2015-03-25
KR102071856B1 (ko) 2020-01-31

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