EP1114273A1 - Raccord et carter, notamment accumulateur de carburant haute pression, presentant un raccord soude de maniere precontrainte, pour un systeme d'injection de carburant de moteurs a combustion interne - Google Patents

Raccord et carter, notamment accumulateur de carburant haute pression, presentant un raccord soude de maniere precontrainte, pour un systeme d'injection de carburant de moteurs a combustion interne

Info

Publication number
EP1114273A1
EP1114273A1 EP00943619A EP00943619A EP1114273A1 EP 1114273 A1 EP1114273 A1 EP 1114273A1 EP 00943619 A EP00943619 A EP 00943619A EP 00943619 A EP00943619 A EP 00943619A EP 1114273 A1 EP1114273 A1 EP 1114273A1
Authority
EP
European Patent Office
Prior art keywords
housing
sealing surface
connecting piece
collar
connection piece
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
EP00943619A
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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 EP1114273A1 publication Critical patent/EP1114273A1/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • Connection piece and housing in particular high-pressure fuel accumulator, with prestressed welded connection piece for a fuel injection system for internal combustion engines
  • the invention relates to a connecting piece according to the preamble of claim 1 and to a housing, in particular a high-pressure fuel accumulator, and a connecting piece connected to the latter
  • Fuel injection system such as high pressure fuel pump
  • High-pressure fuel accumulators and injection nozzles are usually connected to one another by hydraulic lines. This connection is often sealed with the aid of a clamping nut which is pushed over the hydraulic line and which is screwed to a connecting piece which is connected to the housing of the corresponding assembly in a liquid-tight manner. Especially the
  • High-pressure fuel accumulator has a large number of such connecting pieces, for example the Allow fuel supply and fuel drain into and out of the memory.
  • welded structures is that the weld seam has two functions. Firstly, it creates a liquid-tight connection between the housing and the connecting piece, and secondly, it transmits the forces acting between the connecting piece and the housing. Especially with modern ones
  • Fuel injection systems result from the high, swelling operating pressures and high, swelling tensile stresses in the weld seam.
  • Another disadvantage of the known welded constructions is that during the welding process, splashes or welding peaks can reach the high-pressure area of the line or the housing, which can result in malfunctions of the fuel injection system.
  • the present invention has for its object to provide a connecting piece and a housing and a connecting piece connected thereto, which securely seals the high pressure area of the housing and the connecting piece from the environment and in which the high pressure area reliably against particles that can arise when connecting the two components is protected.
  • a connecting piece for a fuel injection system for internal combustion engines with a through hole extending in the direction of the longitudinal axis, with a first end of the connecting piece, on which a collar is arranged concentrically to the through hole, and with a second end, on which a sealing surface for a high pressure Line and means for connecting high-pressure line and connecting piece are arranged, the
  • Connection piece has at its first end a clamping element arranged concentrically to the through-bore, at the end of which, facing away from the first end of the connection piece, a sealing surface is arranged.
  • connection piece according to the invention there is a between the collar, which brings about the axial fixing of the connection piece in the housing wall, and the sealing surface
  • connection piece provided. This spatial separation of the "holding” and “sealing" functions of the connection piece means that both the sealing surface and the connection of the connection piece and housing can be optimally designed.
  • the separation of the sealing surface and the connection prevents welding spatter or chips that occur during the connection from reaching the high-pressure area of the connection piece, housing or high-pressure line.
  • One embodiment of the invention provides that the tensioning element protrudes beyond the collar in the direction of the longitudinal axis, so that the outside diameter of the connecting piece is kept small and a high spring rate of the tensioning element is made possible.
  • the tensioning element has a first and a second section, the first section extending from the first end of the connecting piece in the direction of the second end of the connecting piece and the second section being arranged concentrically with the first section and extends in the opposite direction.
  • the overall length of the connecting piece is reduced and lower spring rates can be achieved.
  • the notch effect in the housing, with which the connection piece is connected low, since the sealing surface of the housing can be arranged close to its surface.
  • the sealing surface is frustoconical, so that the operating pressure of the fuel injection system increases the surface pressure between the sealing surfaces of the connecting piece and the housing. This further improves the tightness.
  • a sealing surface in the form of an annular surface is provided, so that the manufacture and the subsequent measurement of the connecting piece are simplified.
  • the outer diameter of the clamping element is at least partially smaller than the diameter of the sealing surface, so that when the connecting piece and housing are joined together, the clamping element is deformed inward in the direction of its longitudinal axis.
  • This elastic or plastic deformation is that the operating pressure of the fuel injection system increases the surface pressure of the sealing surfaces, and thus the tightness is additionally increased.
  • the first section of the tensioning element can be displaced relative to the second section in the direction of the sealing surface of the tensioning element, so that the force with which the means for connecting the high-pressure line and connecting piece apply the high-pressure line to the sealing surface
  • the second end of the connection piece is pressed, at least in part, by an additional surface pressure of the sealing surfaces between the housing and the connection piece.
  • this is in the direction the longitudinal axis of the connecting piece onto the sealing surface of the tensioning element projected onto the surface enclosed by the collar within the surface enclosed by the collar.
  • a housing in particular a high-pressure fuel accumulator, for a fuel injection system for internal combustion engines and a connecting piece which has a through-hole and is connected to the housing in a liquid-tight manner, the interior of the housing and the through-hole being provided by a
  • One embodiment of the invention provides that a collar is arranged concentrically to the through hole at a first end of the connecting piece, that the connecting piece has a clamping element arranged concentrically to the through hole at its first end, and a sealing surface at the end thereof facing away from the first end of the connecting piece is arranged that the bore of the housing at its end facing the connecting piece has a concentric annular surface, the diameter of which corresponds to that of the federal government, and a concentric recess, at the bottom of which there is a sealing surface corresponding to the sealing surface of the connecting piece, and that when the housing and Connection pieces are not connected, the axial distance between the sealing surface and the ring surface is smaller than the axial distance between the sealing surface and collar.
  • This configuration has the advantage that the sealing surfaces are arranged in a recess in the housing and are therefore particularly well protected against damage.
  • a prestressing of the tensioning element and thus also a contact pressure on the sealing surfaces can be generated when connecting.
  • the contact pressure can be adapted to the operating conditions.
  • a collar is arranged at a first end of the connection piece concentrically to the through hole, and a sealing surface for a high-pressure line and means for connecting the high-pressure line and connection piece are provided at the second end of the connection piece that the connecting piece has at its first end a concentric to the through hole arranged clamping element, at the, the first end of the A sealing surface facing away from the connecting piece is arranged such that the tensioning element has a first and a second section, the first section extending from the first end of the connecting piece in the direction of the second end of the connecting piece and the second section being arranged concentrically with the first section and extends in the opposite direction, that the bore of the housing has at its end facing the connecting piece a concentric annular surface, the diameter of which corresponds to that of the collar, and a concentric recess, at the bottom of which there is a sealing surface corresponding to the sealing surface of the connecting piece, and that, If the housing and the connecting piece are not connected, the axial distance between the
  • the overall length of the connecting piece is particularly short.
  • the spring rate of the tensioning element is low, so that the pre-tensioning force can be precisely adjusted.
  • the recess in the housing is very flat and the notch effect is low.
  • a collar and a sealing surface are arranged at a first end of the connecting piece concentrically to the through-hole, that the bore of the housing has a concentric annular surface at its end facing the connecting piece, the diameter of which corresponds to that of the collar, and a concentric recess has, at the bottom of which there is a sealing surface, that between the sealing surface of the connecting piece and the sealing surface of the housing there is a clamping element provided with a through-hole, which at its ends has sealing surfaces corresponding to the sealing surfaces of the connecting piece and the housing, and that the clamping element is longer than the axial distance between the sealing surfaces of the connecting piece and the housing is when the collar of the connection piece rests on the ring surface of the housing. Because the clamping element is an independent component, it can be optimally adapted to the requirements through the choice of material and manufacture.
  • the cone angle of the sealing surface of the tensioning element is greater than the cone angle of the sealing surface in the housing, so that when the pretension is applied when connecting the connecting piece and housing, the outer regions of the sealing surface are first pressed against one another with high surface pressure become.
  • the connecting piece and the housing are connected by welding.
  • This housing has the advantages of the known
  • the sealing surface of the projection projected in the direction of the longitudinal axis of the connecting piece onto the surface enclosed by the collar
  • the object of the invention is further achieved by a method for joining a housing, in particular one
  • the clamping element is inserted into the recess of the housing, - The clamping element is preloaded
  • the housing and connection piece are welded in a pre-tensioned state and
  • Fig. 1 a first embodiment of a connecting piece according to the invention and one
  • Fig. 2 a second embodiment of a connecting piece according to the invention and one
  • High-pressure fuel accumulator in longitudinal section such as
  • FIG. 3 the welding of a connecting piece according to the embodiment shown in FIG. 2 in the prestressed state.
  • connection piece 1 shows a first embodiment of a connecting piece 1 according to the invention.
  • the connection piece 1 is welded to the wall of a housing 2.
  • the weld seam 3 is circumferential and can be produced by a wide variety of welding processes.
  • the connector 1 has the task of a hydraulic
  • connection pieces 1 and 2 are connected to a through bore 7 of the connecting piece 1.
  • High-pressure line 5 corresponds to a clamping nut 8 the state of the art.
  • this collar 9 acts as a stop in the direction of the longitudinal axis of the connecting piece 1 when it is seated on a corresponding annular surface 10 of the housing 2.
  • the position of the connection piece 1 with respect to the housing 2 during welding is thus determined.
  • a clamping element 12 of the connecting piece 1 projects into a recess 11 in the housing 2.
  • the outer diameter of the clamping element 12 can be dimensioned such that the connecting piece is centered in the recess 11 by the clamping element 12.
  • the clamping element 12 has a frustoconical sealing surface 13 at its end. This sealing surface 13 lies on a sealing surface 14 of the housing 2. This ensures that the cavities 15 between the connection piece 1 and the housing 2 are not filled with fuel and therefore no corresponding compressive forces act on the weld seam 3.
  • Chip elements 12 have the result that the internal pressure in the through bore 7 increases the contact pressure between the sealing surfaces 13 and 14. In addition, after welding, it can be checked by measuring the diameter of the bore 7 whether there is sufficient pretensioning force between the sealing surfaces 13 and 14.
  • the outer diameter of the clamping element 12 can be selected to be smaller than the diameter of the sealing surface 13 or it can be ensured by the choice of the cone angle of the sealing surfaces 13 and 14 that the pretensioning force causes a bending moment which causes the desired inward deformation. This is the case, for example, when the cone angle of
  • Sealing surface 13 is larger than that of sealing surface 1 in the non-prestressed state.
  • the difference in the cone angle must be such that when the entire preload is applied and the collar 9 rests on the annular surface 10, the tightness between the
  • FIG. 2 shows a second embodiment of the connecting piece 1 according to the invention.
  • the reference numbers used correspond to those in FIG. 1. Differences between the embodiments of FIGS. 1 and 2 exist in particular with regard to the connection of connecting piece 1 and housing 2 and with regard to the tensioning element 12.
  • FIG. 2 An embodiment is shown on the left side of FIG. 2, in which the connecting piece 1 is welded to the housing 2 via its collar 9.
  • a variant is shown on the right-hand side of FIG. 2, in which the collar 9 and the weld seam 3 are spatially separated.
  • the collar 9 rests on the annular surface 10.
  • an extremely resilient connection between the connecting piece 1 and the housing 2 is produced by the weld seam 3 by means of a welding ring 16.
  • the collar 9, as shown on the right-hand side of FIG. 2, can center the connecting piece 1 with respect to the bore 6.
  • the tensioning element 12 has a first section 17 loaded under tension and a second section 18 loaded under pressure. The pretensioning of the tensioning element 12 results similarly to the exemplary embodiment shown in FIG.
  • Connection piece 1 presses, continues in the second section 18 of the clamping element 12 and leads to a further increase in the contact pressure between the sealing surfaces 13 and 14. This effect is enhanced if a transition region 20, which connects the first and second sections 17 and 1'8, is made soft.
  • FIG. 3 it is shown how the connection of connection piece 1 and housing 2 can be realized.
  • the right and left sides of FIG. 3 each have different structural configurations, similar to FIG. 2.
  • a stamp 21 can be seen, with the aid of which the connecting piece 1 is pressed onto the housing 2 until the collar 9 is seated on the annular surface 10.
  • a stamp 21 is shown with centering mandrel 22, while on the right 3 a stamp 21 is shown without a centering device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un raccord (1) et un carter (2), notamment un accumulateur de carburant haute pression pour un système d'injection de carburant de moteurs à combustion interne, présentant un raccord soudé (1). Des surfaces d'étanchéité séparées physiquement du cordon de soudure (3) sont situées entre le carter (2) et le raccord (1).
EP00943619A 1999-07-15 2000-05-19 Raccord et carter, notamment accumulateur de carburant haute pression, presentant un raccord soude de maniere precontrainte, pour un systeme d'injection de carburant de moteurs a combustion interne Ceased EP1114273A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933256 1999-07-15
DE19933256A DE19933256A1 (de) 1999-07-15 1999-07-15 Anschlussstutzen und Gehäuse, insbesondere Kraftstoffhochdruckspeicher, mit vorgespannt angeschweißtem Anschlussstutzen für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
PCT/DE2000/001619 WO2001006167A1 (fr) 1999-07-15 2000-05-19 Raccord et carter, notamment accumulateur de carburant haute pression, presentant un raccord soude de maniere precontrainte, pour un systeme d'injection de carburant de moteurs a combustion interne

Publications (1)

Publication Number Publication Date
EP1114273A1 true EP1114273A1 (fr) 2001-07-11

Family

ID=7914933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00943619A Ceased EP1114273A1 (fr) 1999-07-15 2000-05-19 Raccord et carter, notamment accumulateur de carburant haute pression, presentant un raccord soude de maniere precontrainte, pour un systeme d'injection de carburant de moteurs a combustion interne

Country Status (7)

Country Link
US (1) US6698801B1 (fr)
EP (1) EP1114273A1 (fr)
JP (1) JP2003532820A (fr)
KR (1) KR20010075046A (fr)
CN (1) CN1317079A (fr)
DE (1) DE19933256A1 (fr)
WO (1) WO2001006167A1 (fr)

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JP4438450B2 (ja) * 2003-04-07 2010-03-24 株式会社デンソー 配管継手装置およびその組付方法
DE10333721B4 (de) * 2003-07-23 2005-07-07 Benteler Automobiltechnik Gmbh Kraftstoffverteilerleiste mit einem Anschlussstück
FR2872252B1 (fr) * 2004-06-25 2008-03-14 Senior Automotive Blois Sas So Dispositif de connexion
ATE372458T1 (de) * 2005-07-08 2007-09-15 Fiat Ricerche Anordnung zur verbindung eines kraftstoffspeichers für kraftstoff unter druck und mindestens einem injektor, für eine brennkraftmaschine
KR100937058B1 (ko) * 2005-08-04 2010-01-15 신닛뽄세이테쯔 카부시키카이샤 자동차용 고압 연료 분사 축압 분배기 및 그 제조 방법
DE102005044276A1 (de) * 2005-09-16 2007-03-29 Daimlerchrysler Ag Kraftstoffverteiler
FR2908837B1 (fr) * 2006-11-20 2011-06-17 Assemblage Et Brasage Soc D Rampe d'injection a haute pression pour moteur a combustion interne
US20080236958A1 (en) * 2007-03-29 2008-10-02 Debiasi International Limited Pressure vessel for vehicular air brake system
ATE549505T1 (de) * 2007-07-04 2012-03-15 Caterpillar Motoren Gmbh & Co Brennstoffsystem für einen verbrennungsmotor mit lokaler leckerkennung
US20090144959A1 (en) 2007-12-11 2009-06-11 Colletti Michael J Method for assembly of a direct injection fuel rail
DE102008013575B3 (de) * 2008-03-11 2009-08-13 Poppe & Potthoff Gmbh Kraftstoffverteilerbaugruppe
EP2284385B1 (fr) * 2009-07-07 2014-06-25 Continental Automotive GmbH Dispositif de rampe de carburant
CN101949345A (zh) * 2010-09-20 2011-01-19 合肥恒信汽车发动机部件制造有限公司 一种塑料燃油分配器
DE102012009615B4 (de) * 2012-05-15 2023-07-27 Faurecia Emissions Control Technologies, Germany Gmbh Verfahren zum Löten und Baugruppe
JP5854979B2 (ja) * 2012-12-21 2016-02-09 株式会社鷺宮製作所 冷媒回路構成部品における接合方法
JP2019052616A (ja) * 2017-09-19 2019-04-04 臼井国際産業株式会社 高圧直噴用のレール
US20220307454A1 (en) * 2021-03-26 2022-09-29 Robert Bosch Gmbh Fitting for a Fluid Delivery System

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Also Published As

Publication number Publication date
WO2001006167A9 (fr) 2003-03-06
JP2003532820A (ja) 2003-11-05
US6698801B1 (en) 2004-03-02
WO2001006167A1 (fr) 2001-01-25
DE19933256A1 (de) 2001-01-25
KR20010075046A (ko) 2001-08-09
CN1317079A (zh) 2001-10-10

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