EP1492952A1 - Raccordement de fuite con u pour un injecteur de carburant - Google Patents

Raccordement de fuite con u pour un injecteur de carburant

Info

Publication number
EP1492952A1
EP1492952A1 EP03724868A EP03724868A EP1492952A1 EP 1492952 A1 EP1492952 A1 EP 1492952A1 EP 03724868 A EP03724868 A EP 03724868A EP 03724868 A EP03724868 A EP 03724868A EP 1492952 A1 EP1492952 A1 EP 1492952A1
Authority
EP
European Patent Office
Prior art keywords
leakage
injector
leakage connection
connection
connection according
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
EP03724868A
Other languages
German (de)
English (en)
Other versions
EP1492952B1 (fr
Inventor
Dieter Marksteiner
Klaus Rübling
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP06015047A priority Critical patent/EP1722096B1/fr
Publication of EP1492952A1 publication Critical patent/EP1492952A1/fr
Application granted granted Critical
Publication of EP1492952B1 publication Critical patent/EP1492952B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors

Definitions

  • the present invention relates to a leakage connection for an injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • accumulator injection systems are increasingly being used which work with very high injection pressures.
  • fuel is conveyed by means of a high-pressure pump into a fuel injector, from which the fuel is injected into the combustion chamber of the internal combustion engine.
  • a fuel injector has an injection valve that is opened or closed hydraulically by a control valve with the aid of an applied fuel pressure.
  • the control valve is actuated by an actuator.
  • the leakage connection on the injector is formed by a stepped bore into which a line with a connection nipple is inserted.
  • the connection nipple on the fuel injector is secured by means of a flexible locking element.
  • this arrangement is relatively complex and comprises a large number of individual components.
  • the connection of the leakage return line to a leakage connection on the fuel injector is achieved in that the leakage connection is formed in one piece with an already existing component of the injector and a leakage nipple for connecting a leakage return line is formed in one piece on the leakage connection.
  • the leakage connection with the function of connecting a leakage return line is thus integrated in an already existing component of the injector with a corresponding component function. As a result, the number of components can be kept low.
  • the complex securing of a leakage nipple of the leakage return line in the leakage connection necessary in the prior art can be omitted.
  • the leakage connection according to the invention is preferably constructed such that two leakage nipples are integrally formed on the component of the injector with a leakage connection.
  • the injector component thus has two leakage connections, so that leakage can be derived at different locations on the injector.
  • the two leakage nipples are preferably arranged opposite one another by 180 °.
  • connection nipples are preferably arranged at an angle of approximately 45 ° to an injector main axis.
  • a recess is formed at a transition point between an internal injector leakage line and the leakage connection.
  • the cutout is particularly preferably designed as a circumferential groove, which is covered by the injector component with an integrated leakage connection. It should be noted that the circumferential groove can of course also be formed in the injector component with a leakage connection, or that a recess is provided both on the injector component with a leakage connection and on the adjacent injector component, which then results in a circumferential channel in the assembled state.
  • the transition point is preferably sealed by means of at least one sealing ring.
  • the sealing ring can be arranged either in the injector component with a leakage connection or in the other injector component.
  • the injector In order to absorb the largest possible amount of leakage in the fuel injector, the injector preferably has an essentially are vertical leakage collection bores, which are connected to the leakage connection via a cross bore.
  • the injector component with an integrated leakage connection is a coupling element between the injector and an engine component, e.g. the cylinder head.
  • the coupling element is preferably a centering sleeve or a damping component.
  • the centering sleeve thus serves on the one hand to center the injector in a cylinder head of the internal combustion engine and, as a further function, has the connection function of the leakage return line.
  • the damping component then also has the connection function of the leakage return line.
  • the inner wall of the coupling element is preferably designed as a sealing seat for an annular seal. This ensures that the transition point between the coupling element and the injector is securely sealed.
  • Leakage connections of different injectors are preferably connected to one another in such a way that a leakage return line connected or arranged in series is formed.
  • at least one injector component with a leakage connection must have a plurality of leakage connections, and one of these leakage connections is finally connected to the leakage return line into the fuel reservoir.
  • the injector components are particularly preferably each formed with two leakage connections, so that a series connection with short paths can be implemented in a simple manner.
  • the component is preferably made of plastic.
  • the injector component with integrated leakage finally simply, for example by means of injection molding.
  • the component with a leakage connection can also be made of metal.
  • the leakage return line In order to enable the leakage return line to be fastened to the leakage nipple quickly and easily, the latter preferably has an undercut. As a result, the leakage return line is sufficiently secured to the leakage nipple and the leakage return line can be assembled and disassembled quickly and easily.
  • the present invention relates to a leakage return device with a leakage connection according to the invention.
  • a leakage connection for an injector for injecting fuel comprises an integrally formed leakage nipple for connecting a leakage return line and an integrally formed holding device.
  • the holding device enables one
  • the integrally formed holding device of the leakage connection preferably has two clamping arms, which enable a non-positive and positive connection to the existing injector component.
  • the tensioning arms preferably have a fixing area and an auxiliary assembly area.
  • the fixing area is used to attach the leakage connection to the already existing injector component.
  • the clamping arms are particularly preferably arranged laterally on a leakage drain of the leakage connection.
  • a connection point between the clamping arms and the leakage drain also serves as a pivot point for the clamping arms. The connection point thus continues to be used to subdivide the clamping arms into the fixing area and the assembly aid area.
  • the leakage connection is particularly advantageously T-shaped with two integrally formed leakage nipples. This enables redundant discharge of the leak or facilitates the series connection of several leak connections of different injectors.
  • the injector component, to which the leakage connection can be fixed is preferably a fuel supply nozzle.
  • the fixing area of the tensioning arms is particularly preferably flattened perpendicular to the axial direction of the fuel supply nozzle, so that the tensioning arms can be attached to the flattened fixing area, for example by means of a nut.
  • the leakage connection thus enables a small number of components, which significantly reduces the assembly effort. Furthermore, no complicated fastening devices for fastening the leakage connection are necessary. If the leakage connection is fixed to a fuel supply connection, a particularly compact design with clear advantages in terms of installation space can also be realized.
  • FIG. 1 shows a schematic sectional view of an injector component with an integrated leakage connection according to a first exemplary embodiment of the present invention
  • FIG. 2 shows a schematic side view of an injector for a leakage connection shown in FIG. 1,
  • FIG. 3 shows a detailed view of detail X from FIG. 2,
  • Figure 4 is a schematic, perspective view of a
  • FIG. 5 shows a schematic, partially sectioned view of assembled injector components with an integrated leakage connection according to FIG. 4,
  • FIG. 6 shows a schematic, perspective partial view of a storage injection system with a leakage connection according to the second exemplary embodiment
  • FIG. 7 shows a perspective view of a leakage connection according to a third exemplary embodiment of the present invention.
  • Figure 8 is a perspective view of the leakage connection shown in Figure 7 in the assembled state.
  • the injector component 1 with an integrated leakage connection comprises a centering sleeve 2 and a leakage connection 3 formed integrally thereon.
  • the centering sleeve 2 serves to center the fuel injector 6 in a bore in a cylinder head 13 of an internal combustion engine.
  • the leakage connection 3 comprises an integrally formed nipple 4.
  • the leakage connection 3 is formed at an angle of approximately 45 ° to an injector main axis X-X.
  • a corresponding recess 19 for receiving the leakage connection 3 is formed in the cylinder head 13.
  • the leakage connection 3 comprises the nipple 4 integrally formed thereon and an inner leakage bore 5.
  • an undercut 12 is provided in order to securely fasten a leakage return line (not shown).
  • a vertically running leakage collection bore 8 is formed in the injector 6, in which the fuel return quantity of the injector and leakages due to gaps between the injector components converge.
  • a horizontal transverse bore 7 extends from the leakage collection bore 8 to the outside of the injector 6.
  • a circumferential groove 11 is formed in the injector 6 in the region of the transverse bore 7.
  • the injector component 1 is arranged on this circumferential groove 11 in order to guide the leakage flow into the leakage return line.
  • a sealing ring 9, 10 is arranged above and below the circumferential groove 11.
  • the injector component 1 comprises both the centering sleeve 2 and the leakage connection 3 formed integrally therewith with an integrated nipple 4.
  • the number of components can accordingly be kept small, while a secure connection is obtained by providing the nipple 4 for fastening a leakage return line can.
  • a leakage return line placed over the nipple 4 is securely attached to the leakage connection 3. This enables quick assembly and disassembly.
  • a clamping component such as a clamp, can also be attached to the outside of the leakage return line in the area of the undercut in order to clamp the leakage return line to the undercut 12.
  • FIGS. 4 to 6 An injector component 1 with an integrated leakage connection 3 according to a second exemplary embodiment of the present invention is described below with reference to FIGS. 4 to 6. Identical or functionally identical parts are again identified by the same reference symbols.
  • the injector component 1 also comprises a centering sleeve 2.
  • the injector component 1 comprises two integrally formed leakage connections 3 and 14.
  • the two leakage connections 3 and 14 are arranged opposite one another by 180 °.
  • An inner wall 16 of the centering sleeve 2 is designed as a contact surface for two sealing rings, which seal a circumferential groove 11 formed on the injector 6.
  • the individual injectors 6 are each fastened to the cylinder head 13 by means of clamping claws 18.
  • the clamping claw 18 fixes the injector 6 in the cylinder head 13 with respect to axial displacements.
  • the sleeves 2 are designed such that they can compensate for installation tolerances with respect to a fixation in the axial direction X-X.
  • the injector component 1 By designing the injector component 1 with two leakage connections 3 and 14, it is possible, as can be seen in particular from FIGS. 5 and 6, to form a leakage return in a series connection.
  • the leakage occurring at the injector 6 is discharged via the circumferential groove 11 both to the first leakage connection 3 and to the second leakage connection 14.
  • the leakage is led from the second leakage connection 14 via a leakage return line 17 to a first leakage connection 3 'of a second injector 6'.
  • the leakage From the second injector 6 ', the leakage is guided via a circumferential groove 11' (FIG. 5) to a second leakage connection 14 'of the second injector 6' and via the leakage line 17 'to a third injector 6''.
  • leakage is led in the same way via the leakage return line 17 ′′ to a fourth injector 6 ′′ ′′ and from the second leakage connection 14 ′′ ′′ back to a fuel tank.
  • This configuration of the arrangement of several leakage connections of different injectors in a row enables a particularly compact design for the leakage return.
  • leakage may in this case via the first leakage connection 3 of the first injector 6 and the second leakage connection 14 '''of the fourth injector 6' are removed 1. 1 A redundant leakage recirculation can thereby be formed. There are very short conduits between the individual injectors.
  • connection function for a leakage line means that fewer components are required than in the prior art. This reduces the assembly effort and also the manufacturing costs can be reduced. Furthermore, a particularly compact leakage device can be provided in particular by arranging the leakage return lines in series. This results in space advantages over the prior art.
  • the present invention thus relates to a leakage connection 3 for an injector 6 for injecting fuel into a combustion chamber of an internal combustion engine.
  • the leakage connection 3 is formed in one piece with an injector component 1.
  • a leakage nipple 4 for connecting a leakage return line 17 is integrally formed at the leakage connection 3.
  • a leakage connection 23 according to a third exemplary embodiment of the present invention is described below with reference to FIGS. 7 and 8.
  • a holding device consisting of a first clamping arm 28 and a second clamping arm 29 is formed integrally with the leakage connection 23.
  • the leakage connection 23 is T-shaped.
  • the leakage connection 23 comprises a leakage outlet 26 fastened in the injector, which ends in a branch line 27 which has an integrally formed connection nipple 24, 25 at each of its two ends.
  • the leakage connection 23 thus has a substantially T-shaped configuration.
  • the two clamping arms 28, 29 are formed integrally with the leakage connection 23 on the circumference of the branch line 27 directed towards the injector.
  • the first clamping arm 28 has a fixing area 30 and an auxiliary mounting area 31.
  • the second clamping arm 29 also has a fixing area 32 and an auxiliary mounting area 33.
  • the tensioning arms 28, 29 are pivotally attached.
  • This can be implemented, for example, in such a way that the leakage connection 23 is produced entirely from a plastic by means of injection molding.
  • the assembly aid areas 31, 33 are used in the assembly in such a way that they are moved against one another by being pressed together in the direction of the arrows A and B.
  • the fixing regions 30 and 32 of the clamping arms 28 and 29 spread out, so that the leakage connection 23 can be easily installed.
  • the fixing areas 30 and 32 are spread out by means of a lever principle, so that only minimal assembly forces are required.
  • the assembled state of the leakage connection 23 is shown in FIG.
  • the clamping arms 28, 29 encompass a high-pressure supply nozzle 21.
  • the clamping arms 28, 29 are fixed to the supply nozzle 21 by means of a nut 22.
  • the clamping arms 28, 29 are flattened perpendicularly to the axial direction of the feed connector 21 at their fixing area 30, 32. This enables a more secure attachment of the leakage connection to the supply nozzle 21. Due to the attachment to the supply nozzle 21, there is still a certain degree of rotational alignment and position fixing for the leakage. connection 23 possible.
  • the clamping arms 28, 29 engage in a threaded groove formed on the supply nozzle 21 in the assembled state.
  • the leakage connection 23 can also be disassembled from the supply nozzle 21 in a non-destructive manner, in order, for example, to allow a repair or the like on the injector 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un raccordement de fuite (3) conçu pour un injecteur (6) servant à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. Ce raccordement de fuite (3) fait corps avec un composant d'injecteur (1). Un mamelon de fuite (4) est formé sur le raccordement de fuite (3) de manière à ne faire qu'un avec ce dernier et permet d'attacher une conduite de retour de fuite (17).
EP03724868A 2002-04-11 2003-04-11 Raccordement de fuite con u pour un injecteur de carburant Expired - Lifetime EP1492952B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06015047A EP1722096B1 (fr) 2002-04-11 2003-04-11 Injecteur de carburant avec un raccordement de fuite conçu

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10215980 2002-04-11
DE10215980A DE10215980B4 (de) 2002-04-11 2002-04-11 Leckageanschluss für einen Kraftstoffinjektor
PCT/DE2003/001239 WO2003087567A1 (fr) 2002-04-11 2003-04-11 Raccordement de fuite conçu pour un injecteur de carburant

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP06015047A Division EP1722096B1 (fr) 2002-04-11 2003-04-11 Injecteur de carburant avec un raccordement de fuite conçu

Publications (2)

Publication Number Publication Date
EP1492952A1 true EP1492952A1 (fr) 2005-01-05
EP1492952B1 EP1492952B1 (fr) 2007-01-24

Family

ID=28684946

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06015047A Expired - Fee Related EP1722096B1 (fr) 2002-04-11 2003-04-11 Injecteur de carburant avec un raccordement de fuite conçu
EP03724868A Expired - Lifetime EP1492952B1 (fr) 2002-04-11 2003-04-11 Raccordement de fuite con u pour un injecteur de carburant

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06015047A Expired - Fee Related EP1722096B1 (fr) 2002-04-11 2003-04-11 Injecteur de carburant avec un raccordement de fuite conçu

Country Status (5)

Country Link
US (2) US20050045154A1 (fr)
EP (2) EP1722096B1 (fr)
JP (1) JP2005522630A (fr)
DE (3) DE10215980B4 (fr)
WO (1) WO2003087567A1 (fr)

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Also Published As

Publication number Publication date
US20050045154A1 (en) 2005-03-03
US20070283932A1 (en) 2007-12-13
EP1722096A3 (fr) 2006-11-29
EP1492952B1 (fr) 2007-01-24
EP1722096B1 (fr) 2008-11-26
DE50310842D1 (de) 2009-01-08
US7475674B2 (en) 2009-01-13
EP1722096A2 (fr) 2006-11-15
DE10215980A1 (de) 2003-10-30
WO2003087567A1 (fr) 2003-10-23
DE50306380D1 (de) 2007-03-15
JP2005522630A (ja) 2005-07-28
DE10215980B4 (de) 2008-03-27

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