EP1705366A1 - Hochdruck-Brennstoffleitung - Google Patents

Hochdruck-Brennstoffleitung Download PDF

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Publication number
EP1705366A1
EP1705366A1 EP05004693A EP05004693A EP1705366A1 EP 1705366 A1 EP1705366 A1 EP 1705366A1 EP 05004693 A EP05004693 A EP 05004693A EP 05004693 A EP05004693 A EP 05004693A EP 1705366 A1 EP1705366 A1 EP 1705366A1
Authority
EP
European Patent Office
Prior art keywords
storage unit
pressure fuel
embodied
fuel storage
base unit
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.)
Withdrawn
Application number
EP05004693A
Other languages
English (en)
French (fr)
Inventor
Roberto Ricci
Domenico Viggiani
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 EP05004693A priority Critical patent/EP1705366A1/de
Publication of EP1705366A1 publication Critical patent/EP1705366A1/de
Withdrawn legal-status Critical Current

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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
    • 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 high-pressure fuel storage unit for a fuel injection system with an internal combustion engine and with a lengthwise base unit into which at least one continuous hollow space is embodied in the longitudinal direction of the base unit, with at least one fuel inlet and at least one fuel outlet.
  • a high-pressure storage fuel unit with a tubular base unit and with at least one connection for the fuel supply, at least one connection for the drawing off of fuel and at least one fastening element is known.
  • the tubular base unit is embodied with the connections and the fastening element in one piece.
  • the hollow profile of the tubular base unit is made by means of profile extrusion.
  • a disadvantage of such a structure is the fact that the manufacturing cost of the matrix that is needed for the extrusion is very high.
  • the position of the terminal strip and the fastening strip has already been determined by the extrusion process and cannot be changed afterwards. This results in a rigid embodiment of the high-pressure fuel storage unit.
  • the position for later attachment of the fuel storage unit connections must be planned in right at the start when the matrices are produced. Therefore, an adaptation to different engine variants is only possible with great effort and at increased costs.
  • the high-pressure fuel storage unit for a fuel injection system of an internal combustion engine and with a lengthwise base unit into which at least one continuous hollow space is embodied in the longitudinal direction of the base unit, with at least one fuel inlet and at least one fuel outlet is in itself characterized by the fact that the lengthwise base unit is embodied as a rectangular profile and is made by means of an extrusion process whereby the hollow space in the lengthwise base unit is embodied at the same time.
  • the profile extrusion process offers the advantage that the length of the high-pressure fuel storage unit and as a result also the storage volume can be adapted in a simple way individually to the engine conditions.
  • the hollow profile then leaves the profile extruder in the form of a long profile blank.
  • a section can be cut off from the profile blank which already has the desired length of the subsequent high-pressure fuel storage unit. Because a hollow profile is already embodied at the same time as the extrusion process, the usually essential, expensive and complicated deep-hole boring process is dispensed with in a particularly advantageous manner. Because of the rectangular profile of the lengthwise base unit, the connections can be made anywhere and at random on each one of the flat sides in the high-pressure fuel storage unit. The connecting holes, in this case, on the basis of the flat surfaces can be made much easier than those for a tubular high-pressure fuel unit. Because in the case of the rectangular profile, unlike the pipe there are only flat contact surfaces, an off-center bore must be excluded to a large extent.
  • a particularly advantageous development of the invention with at least two hollow spaces embodied in the longitudinal direction of the base unit takes care of the fact that the hollow spaces are at least interconnected hydraulically by at least one connecting opening.
  • the smaller hollow spaces arranged side by side in the base unit are able to maintain a higher pressure load in the case of an altogether constant hollow space volume than an individual hollow space with a larger diameter. Therefore, the connection between the individual hollow spaces takes care of the fact that the pressure in all the hollow spaces is the same and that pressure differences which would influence the injection behaviour cannot occur in any way.
  • a further advantageous embodiment of the invention provides for the longitudinal axes of the individual connecting openings to run at right angles to the longitudinal axes of the hollow spaces.
  • the rectangular cross-section profile of the high-pressure fuel storage unit means that the perpendicular or right-angled arrangement of the connecting openings is very easy to produce.
  • a further advantageous embodiment of the invention provides for the connecting opening to be embodied as a through-hole.
  • a through-hole can be made particularly easily in the base unit.
  • connecting openings and/or the hollow spaces are sealed by plugs.
  • sealing plugs all the openings in the high-pressure fuel storage unit which are not used for other purposes, for example, to connect fuel inlet lines or fuel outlet lines can be sealed off in a simple and cost-effective way.
  • fastening means are embodied in the base unit via which additional components or sealing plugs can be connected to the hollow space.
  • an internal thread which is embodied in the hollow space is particularly suitable and mates with a corresponding external thread which is embodied on the additional component or the sealing plug.
  • the screw-in process makes possible a secure and leaktight connection of the components with the base unit.
  • the internal threads can be made in the base unit in a simple way. In order to ensure a particularly secure seal, additional sealing elements such as sealing discs can be used.
  • At least one connection for fastening the high-pressure fuel storage unit to another component of the internal combustion engine is embodied in the base unit .
  • the fastener can be embodied particularly advantageously in the form of a through-hole. In this case, neither additional fastening elements nor fixing strips need to be provided on the high-pressure storage unit. This produces a particularly simple structure of the high-pressure fuel storage unit.
  • the rectangular high-pressure fuel storage unit embodied by an extrusion process is, on the one hand, particularly easy to manufacture, and makes possible because of its flat contact surfaces, on the other hand, a particularly easy embodiment of the connections.
  • the high-pressure fuel storage unit can be adapted very easily in the different engine variants and is very cost-effective to manufacture.
  • the figure is a three-dimensional view of the high-pressure fuel storage unit.
  • the high-pressure fuel storage unit in essence, consists of a lengthwise base unit 1 which is embodied as a rectangular profile.
  • Two continuous hollow spaces 2 are embodied in the lengthwise base unit 1.
  • the hollow spaces 2 are interconnected hydraulically by means of two connecting openings 5. This means that the pressure between the two hollow spaces 2 is always equalized, resulting in the fact that there can be no pressure differences between the individual hollow spaces 2 which could influence the injection behaviour of the injectors.
  • the connecting openings 5 are embodied as through-holes.
  • the connecting openings 5 in this way can be made perpendicular to one of the flat side surfaces in the lengthwise base unit 2.
  • the sealing plugs 6 seal off the connecting openings 5 (only one of the two sealing plugs is shown on the drawing).
  • the hollow space 2 embodied as a through-hole has already also been embodied during the extrusion process of the lengthwise base unit. Therefore, the drilling of the hollow spaces required in the case of the conventional high-pressure fuel storage units is not needed. The extrusion process results in a high surface quality so that a post-processing of the hollow spaces 2 is not necessary.
  • Fastening means 7 are embodied in base unit 1 via which individual components such as sealing plugs 6, pressure sensors, pressure valves or connecting lines can be attached for the inlet or the outlet.
  • individual components such as sealing plugs 6, pressure sensors, pressure valves or connecting lines can be attached for the inlet or the outlet.
  • fastening means 7 internal threads which are embodied in the specific end vicinity of the hollow spaces and mate with the corresponding external threads on the individual components are particularly suitable.
  • the base unit 1 has connections 8, preferably simple through-holes.
  • the through-holes serve to accommodate the fastening screws by means of which the high-pressure fuel storage unit can be fastened.
  • the through-holes make possible a particularly simple fastening of the high-pressure fuel storage unit. Therefore, the conventional terminal lugs which are complicated to manufacture can be dispensed with completely. This greatly reduces the manufacturing costs of the high-pressure fuel storage unit.
  • the high-pressure fuel storage unit is, in particular, distinguished by means of its simple embodiment.
  • the lengthwise base unit embodied as a rectangular profile is manufactured together with the hollow spaces in an extrusion process. Subsequently, connecting openings which are possible between several hollow spaces as well as the fasteners for fastening the high-pressure fuel storage unit to the internal combustion engine must still be embodied. Therefore, such a high-pressure fuel storage unit can be manufactured particularly easily and very cost-effectively.
  • the high-pressure fuel storage unit illustrated naturally shows only one possible embodiment.
  • the high-pressure fuel storage unit can also self-evidently be embodied with only one hollow space.
  • the connecting openings can be dispensed with in this case resulting in an even simpler structure of the high-pressure fuel storage unit.
  • embodiments with more than two hollow spaces are, however, also feasible. This allows the volume to be adapted as required to the corresponding engine variant in a simple manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05004693A 2005-03-03 2005-03-03 Hochdruck-Brennstoffleitung Withdrawn EP1705366A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05004693A EP1705366A1 (de) 2005-03-03 2005-03-03 Hochdruck-Brennstoffleitung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05004693A EP1705366A1 (de) 2005-03-03 2005-03-03 Hochdruck-Brennstoffleitung

Publications (1)

Publication Number Publication Date
EP1705366A1 true EP1705366A1 (de) 2006-09-27

Family

ID=34934044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05004693A Withdrawn EP1705366A1 (de) 2005-03-03 2005-03-03 Hochdruck-Brennstoffleitung

Country Status (1)

Country Link
EP (1) EP1705366A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5197436A (en) * 1989-03-31 1993-03-30 Yamaha Hatsudoki Kabushiki Kaisha Fuel delivery system for V-type engine
US5595160A (en) * 1994-04-13 1997-01-21 Nippondenso Co., Ltd. Fuel supply system and delivery pipe for use in same
JPH09280460A (ja) * 1996-04-17 1997-10-31 Usui Internatl Ind Co Ltd コモンレール及びその製造方法
US6371083B1 (en) * 2000-11-20 2002-04-16 Robert Bosch Corporation Self-damping manifold
DE10256703B3 (de) * 2002-12-04 2004-04-01 Siemens Ag Verfahren zur Herstellung von Kraftstoffhochdruckspeichern
EP1416151A2 (de) * 2002-10-31 2004-05-06 Nissan Motor Company, Limited Hochdruck-Common-Rail für eine Brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5197436A (en) * 1989-03-31 1993-03-30 Yamaha Hatsudoki Kabushiki Kaisha Fuel delivery system for V-type engine
US5595160A (en) * 1994-04-13 1997-01-21 Nippondenso Co., Ltd. Fuel supply system and delivery pipe for use in same
JPH09280460A (ja) * 1996-04-17 1997-10-31 Usui Internatl Ind Co Ltd コモンレール及びその製造方法
US6371083B1 (en) * 2000-11-20 2002-04-16 Robert Bosch Corporation Self-damping manifold
EP1416151A2 (de) * 2002-10-31 2004-05-06 Nissan Motor Company, Limited Hochdruck-Common-Rail für eine Brennkraftmaschine
DE10256703B3 (de) * 2002-12-04 2004-04-01 Siemens Ag Verfahren zur Herstellung von Kraftstoffhochdruckspeichern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 02 30 January 1998 (1998-01-30) *

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