EP1153216A1 - Tubulure de raccordement et boitier pour un systeme d'injection de carburant - Google Patents

Tubulure de raccordement et boitier pour un systeme d'injection de carburant

Info

Publication number
EP1153216A1
EP1153216A1 EP00993331A EP00993331A EP1153216A1 EP 1153216 A1 EP1153216 A1 EP 1153216A1 EP 00993331 A EP00993331 A EP 00993331A EP 00993331 A EP00993331 A EP 00993331A EP 1153216 A1 EP1153216 A1 EP 1153216A1
Authority
EP
European Patent Office
Prior art keywords
housing
connection piece
sealing
sealing element
sealing surface
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
EP00993331A
Other languages
German (de)
English (en)
Other versions
EP1153216B1 (fr
Inventor
Steffen Jung
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 EP1153216A1 publication Critical patent/EP1153216A1/fr
Application granted granted Critical
Publication of EP1153216B1 publication Critical patent/EP1153216B1/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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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

Definitions

  • the invention relates to a connecting piece according to the preamble of claim 1 and a housing, in particular a high-pressure fuel accumulator, and a connecting piece connected to this, according to the preamble of claim 13.
  • Fuel injection systems such as high-pressure fuel pumps, high-pressure fuel accumulators and injection nozzles, are usually connected to one another by high-pressure hydraulic lines. This connection is often sealed by means of a hydraulic one
  • the high-pressure fuel accumulator has a large number of such connecting pieces, for example the
  • connection pieces which are welded to the housing.
  • a disadvantage of the known 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 in modern fuel injection systems, the high swelling operating pressures result in high swelling tensile stresses in the weld seam.
  • a further disadvantage of the known welded constructions is that during the welding process, splashes or welds can get into the high-pressure area of the line or the housing, which can lead to malfunctions in the
  • Fuel injection system can result.
  • the hydraulic connection of the interior of the housing to the connecting piece is made through a bore.
  • high mechanical stresses occur as a result of the pressure of the liquid in the housing.
  • An advantage of this embodiment is that - provided the hydraulic diameter is the same - the voltage peaks in the housing caused by a plurality of smaller bores are lower than in the case of a single bore of large diameter. This increases the pressure resistance and service life of the high-pressure fuel accumulator.
  • the present invention has for its object to provide a connection piece and a housing and a connection piece connected thereto, which the high pressure area of the housing and Sealing connector securely seals against the environment and in which the high pressure area is reliably protected against particles that can arise when connecting the two components.
  • a connecting piece for a fuel injection system for internal combustion engines with a through-hole extending in the direction of the longitudinal axis, a sealing element having at least one connecting hole running essentially in the same direction as the through-hole being present in the through-hole and at a first end of the Sealing element at least a first sealing surface is present.
  • a sealing element is provided in the through bore of the connecting piece.
  • Connection that welding spatter or swarf occurring during the connection can reach the high-pressure area of the connection piece, housing or high-pressure line.
  • An embodiment of the invention provides that the first sealing surface is designed as a biting edge, so that the surface pressure and thus the tightness of the connection is very high.
  • a sealing edge and the associated flat counter surface can be produced inexpensively.
  • the first sealing surface consists of a plurality of bite edges which are arranged essentially concentrically to one another, so that, in addition to the advantages mentioned above, a further reduction in the tensile stresses in the region of the transition between the housing and the connecting piece is achieved.
  • the first sealing surface is frustoconical or double frustoconical, so that the first sealing surface is robust against mechanical damage and is easy to produce.
  • the first sealing surface has the shape of a circle, or the first sealing surfaces have the shape of a circular ring surface, so that the manufacture and the subsequent measurement of the
  • Connection piece can be simplified.
  • At least one second sealing surface is present at a second end of the sealing element, and that the second sealing surface interacts with a sealing surface of a high-pressure line, so that the transition between the connecting piece and the high-pressure line is also securely sealed.
  • the sealing element has a plurality of connecting bores which are hydraulically connected at least in the area of a second end of the sealing element, so that the fuel flowing out of the housing can be discharged in a high-pressure line and vice versa.
  • Connection bore (9) or the connection bores (9) have recesses at least at one of their ends in order to reduce the flow resistance.
  • the connecting piece has means at its second end for connecting the high-pressure line and the connecting piece, in particular an external thread or an internal thread, so that the connection can be released.
  • the sealing element is screwed to the connection piece, so that there is a functional separation of the connection of the connection piece to the housing on the one hand and the high pressure line on the other hand.
  • a housing in particular a high-pressure fuel accumulator for a fuel injection system for internal combustion engines, with a connection piece, which has a through-hole and is connected to the housing, a sealing element according to one of the preceding claims being arranged in the through-hole and having the outlet prevented from fuel into the environment.
  • the area delimited by the first sealing surface is thereby smaller than, for example, the area enclosed by the weld seam or another connection between the housing and the connecting piece.
  • the pressure forces resulting from the operating pressure of the fuel injection system and acting on the connection of the connecting piece and the housing are reduced. This is advantageous in two ways. Since the area depends on the square of the diameter, the pressure forces are reduced disproportionately. In addition, the amplitude of the swelling stress on the connection between the connecting piece and the housing also decreases, so that the fatigue strength of the connection is additionally increased.
  • the high-pressure fuel accumulator can be adapted to different operating conditions while at the same time optimizing the production costs by changing the number and diameter of the bores. Finally, the separation of the "hold” and “seal" functions means that it is almost impossible to damage the sealing surface when connecting the connector and housing.
  • the sealing element has a first sealing surface at a first end, which cooperates with a correspondingly shaped counter surface of the housing (2), and that the first sealing surface encloses the outlet openings of the bores in the base surface: or that the outlet openings of the bores are within that of the first sealing surfaces.
  • the counter surface of the housing is a recess with a flat base surface, so that the recess can be kept flat and the notch effect is low.
  • the counter surface of the housing is a conical recess or a frustoconical recess, so that the surface pressure between the first sealing surface and the counter surface is self-reinforced.
  • the counter surface of the housing is a substantially trapezoidal annular groove, so that the operating pressure acts on only a further reduced area in the form of an annular surface, and the force resulting from the operating pressure and acting on the connection of the connecting piece and housing is thus further reduced ,
  • the connecting piece and the housing are connected by welding.
  • This housing has the advantages of the known welded structures, such as simple and inexpensive manufacture, without having their disadvantages.
  • Fig. 1 a first embodiment of a connecting piece according to the invention and a housing in longitudinal section;
  • Fig. 2 a second embodiment of a connecting piece according to the invention and a housing
  • Fig. 3 a third embodiment of a connecting piece according to the invention and a housing
  • Fig. 4 a fourth embodiment of a connecting piece according to the invention and a housing, - and
  • Fig. 5 a fifth embodiment of a connecting piece according to the invention in longitudinal section.
  • 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
  • the housing 2 has a plurality of bores 6.
  • An advantage of this configuration is that - provided the hydraulic diameter is the same - the stress peaks in the housing 2 caused by a plurality of smaller bores are lower than in the case of a single bore 6 of large diameter. This increases the pressure resistance and service life of the high-pressure fuel accumulator.
  • the high-pressure fuel reservoir to various combinations
  • the sealing element 8 has at its first end 10 a biting edge 11 which, together with the base 12 of a recess 13 in the housing 2, prevents the fuel, which is not shown in the bores 6 and the connecting bore 9, from reaching the surroundings ,
  • both the biting edge 11 with the base surface 12 and the high-pressure line 5 with a second sealing surface 15 are clamped and sealed at a second end of the sealing element 8.
  • the sealing of the sealing element 8 and the base surface 12 as well as of the sealing element 8 and the high-pressure line 5 can also take place in another way.
  • the pressure forces of the fuel are proportional to the area enclosed by the bite edge 11. Since this area is smaller than the area enclosed by the weld 3, there is a significant reduction in the tensile stresses in the weld 3 caused by the pressure forces of the fuel compared to welded
  • connection piece 1 and sealing element 8 differs between the embodiments according to FIG. 1 and FIGS. 2a and 2b exist in particular with regard to the connection of connection piece 1 and sealing element 8.
  • the sealing element 8 is screwed to an internal thread 17 in the through bore 7 of the connection piece 1.
  • the connecting bore has a recess at one end.
  • FIG. 3a and 3b a third embodiment of the connecting piece 1 according to the invention is shown.
  • the reference numbers used correspond to those in FIG. 1. With regard to the similarities between these embodiments, reference is made to the statements made above.
  • the recess 13 is essentially an annular groove trapezoidal cross-section.
  • the base 19 of the recess 13 is designed as a radius in order to reduce the notch effect.
  • the flanks 20 of the recess 13 form the counter surfaces to the sealing surfaces 21 of the sealing element 8. In the embodiment shown in FIG. 3, the flank angle is 60 °; however, other flank angles can also be used.
  • FIG. 3b shows a top view of a recess 13 according to FIG. 3a. It is clear in this illustration that the annular surface 22 enclosed by the sealing surfaces 21 is again reduced compared to the embodiments in FIGS. 1 and 2, and thus a further reduction in the tensile stresses in the weld seam 3 is achieved.
  • FIG. 4a and 4b show a fourth embodiment of the connecting piece 1 according to the invention.
  • the reference numbers used correspond to those in FIG. 1. With regard to the similarities between these embodiments, reference is made to the statements made above.
  • FIGS. 1 and 4a and 4b Differences between the embodiments of FIGS. 1 and 4a and 4b exist in particular with regard to the configuration of the seal between the first end 10 of the sealing element 8 and the recess 13 of the housing 2.
  • the first end 10 of the sealing element 8 has two concentrically arranged bite edges 11 which prevent the escape of fuel into the environment with the base 12 of the recess 13.
  • several connecting bores 9 are provided in the sealing element 8.
  • FIG. 4b shows a top view of the surface formed by the bite edges 11 and the base surface 12 of the recess 13 according to FIG. 4a.
  • the annular surface 22 enclosed by the biting edges 11 is again reduced compared to the embodiments in FIGS. 1 and 2 and thus a further reduction in the tensile stresses in the weld seam 3 is achieved.
  • connection piece 1 In the fifth embodiment of the connection piece 1 according to the invention shown in FIG. 5, the reference numbers used correspond to those in FIG. 1. With regard to the similarities between these embodiments, reference is made to the statements made above.
  • the first end 10 of the sealing element 8 is frustoconical and cooperates with a correspondingly designed recess 13 such that the bores 6 and the connecting bore 9 are sealed off from the environment.
  • the sealing element 8 is screwed to an internal thread 17 of the connection piece 1.

Landscapes

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

Abstract

L'invention concerne une tubulure de raccordement (1) et un boîtier (2), notamment un accumulateur de carburant haute pression comprenant une tubulure de raccordement soudée de manière précontrainte, pour un système d'injection de carburant destiné à des moteurs à combustion interne. Un élément d'étanchéité (8) assure l'étanchéité entre le boîtier (2) et une conduite haute pression (5) raccordée à la tubulure de raccordement (1).
EP00993331A 1999-12-08 2000-12-06 Tubulure de raccordement et boitier pour un systeme d'injection de carburant Expired - Lifetime EP1153216B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19959105 1999-12-08
DE1999159105 DE19959105A1 (de) 1999-12-08 1999-12-08 Anschlussstutzen und Gehäuse, insbesondere Kraftstoffhochdruckspeicher, mit vorgespannt angeschweißtem Anschlussstutzen für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
PCT/DE2000/004340 WO2001042643A1 (fr) 1999-12-08 2000-12-06 Tubulure de raccordement et boitier pour un systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1153216A1 true EP1153216A1 (fr) 2001-11-14
EP1153216B1 EP1153216B1 (fr) 2005-10-26

Family

ID=7931819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00993331A Expired - Lifetime EP1153216B1 (fr) 1999-12-08 2000-12-06 Tubulure de raccordement et boitier pour un systeme d'injection de carburant

Country Status (6)

Country Link
EP (1) EP1153216B1 (fr)
JP (1) JP2003516497A (fr)
CZ (1) CZ297012B6 (fr)
DE (2) DE19959105A1 (fr)
PL (1) PL200643B1 (fr)
WO (1) WO2001042643A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10307871A1 (de) * 2003-02-25 2004-09-02 Robert Bosch Gmbh Hochdruckleitung für eine Kraftstoffeinspritzanlage
US20090144959A1 (en) * 2007-12-11 2009-06-11 Colletti Michael J Method for assembly of a direct injection fuel rail
US7699041B2 (en) * 2007-12-11 2010-04-20 Delphi Technologies, Inc. Fuel distribution tube for direct injection fuel rail assemblies

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197386B (en) * 1986-11-07 1990-08-29 Lucas Ind Plc Fuel injection nozzle
JP2898384B2 (ja) * 1989-09-27 1999-05-31 臼井国際産業株式会社 高圧燃料レールにおける分岐接続体の接続構造
JP2803383B2 (ja) * 1991-04-08 1998-09-24 トヨタ自動車株式会社 高圧流体用継手
JPH077052A (ja) * 1993-06-16 1995-01-10 Seiko Epson Corp 電気特性測定用プローブ
DE19531743C1 (de) * 1995-08-29 1996-12-05 Guido Jurgen Abdrückvorrichtung
DE19606946C2 (de) * 1996-02-23 1998-02-19 Mtu Friedrichshafen Gmbh Anschlußverbindung einer Kraftstoffhochdruckleitung an eine ortsfeste Anschlußstelle
DE19607521C1 (de) * 1996-02-28 1997-04-10 Juergen Dipl Ing Guido Kraftstoff-Verteilerrohr
DE19614982C1 (de) * 1996-04-16 1997-10-16 Hatz Motoren Hochdruckleitungsanschluß
JPH09303232A (ja) * 1996-05-09 1997-11-25 Toyota Motor Corp コモンレール式ディーゼルエンジンの噴射管接続構造
JP3841370B2 (ja) * 1996-12-07 2006-11-01 臼井国際産業株式会社 コモンレール
DE19744762A1 (de) * 1997-03-18 1998-10-01 Poppe & Potthoff Gmbh & Co Einspritzeinrichtung für einen Dieselmotor
JP3798113B2 (ja) * 1997-04-15 2006-07-19 臼井国際産業株式会社 コモンレール
DE19729392C2 (de) * 1997-07-09 1999-05-06 Siemens Ag Kraftstoffspeicher mit Abdichtung
US6318766B1 (en) * 1997-09-15 2001-11-20 Swagelok Company Face seal gland with raised peripheral ring having circumferentially spaced recesses
DE19753518A1 (de) * 1997-12-03 1999-06-10 Bosch Gmbh Robert Kraftstoffzuleitungseinrichtung
JP4389186B2 (ja) * 1998-02-23 2009-12-24 忠弘 大見 ガスケットおよび管継手
DE19936535A1 (de) * 1999-08-03 2001-02-15 Bosch Gmbh Robert Kraftstoffhochdruckspeicher

Non-Patent Citations (1)

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Title
See references of WO0142643A1 *

Also Published As

Publication number Publication date
PL200643B1 (pl) 2009-01-30
DE19959105A1 (de) 2001-06-21
EP1153216B1 (fr) 2005-10-26
JP2003516497A (ja) 2003-05-13
DE50011447D1 (de) 2005-12-01
CZ20012840A3 (cs) 2002-11-13
CZ297012B6 (cs) 2006-08-16
PL349400A1 (en) 2002-07-15
WO2001042643A1 (fr) 2001-06-14

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