EP2808532B1 - Kraftstoffeinspritzer - Google Patents

Kraftstoffeinspritzer Download PDF

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Publication number
EP2808532B1
EP2808532B1 EP13169872.2A EP13169872A EP2808532B1 EP 2808532 B1 EP2808532 B1 EP 2808532B1 EP 13169872 A EP13169872 A EP 13169872A EP 2808532 B1 EP2808532 B1 EP 2808532B1
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EP
European Patent Office
Prior art keywords
injector
duct
discharge duct
return duct
section
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
EP13169872.2A
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English (en)
French (fr)
Other versions
EP2808532A1 (de
Inventor
Richard Enters
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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Publication date
Application filed by Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13169872.2A priority Critical patent/EP2808532B1/de
Publication of EP2808532A1 publication Critical patent/EP2808532A1/de
Application granted granted Critical
Publication of EP2808532B1 publication Critical patent/EP2808532B1/de
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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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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

Definitions

  • the present invention relates to a diesel fuel injector and more particularly to the arrangement of fuel return channels to the low pressure spaces.
  • a diesel fuel injector includes a cylindrical body in which a control needle is driven to inject fuel through the holes of an injection nozzle, or to plug the nozzle and prohibit the passage of fuel.
  • the fuel flows at high pressure to the injection nozzle part of the fuel is diverted to a control chamber in which opens the upstream end of the needle.
  • a solenoid valve which opens or closes a discharge channel of very small section generally less than 1 mm in diameter by which the fuel of the control chamber can be discharged to the low pressure, see EP1284358 , DE19826719 and EP0449662 .
  • the solenoid valve controls the pressure in the control chamber and thereby the pressure difference between the upstream and downstream of the needle which moves in function.
  • the solenoid valve moves at a frequency of more than 100 Hz to open or close the small discharge channel in which the fuel can be at more than 2000 bar.
  • the present invention aims to remedy the disadvantages mentioned above by proposing a simple and economical solution.
  • the invention provides a diesel fuel injector having a body in which the pressurized fuel flows between an inlet and a needle-controlled injection nozzle.
  • the needle moves axially under the influence of the pressure difference between a control chamber arranged upstream of the needle and the injection nozzle downstream.
  • the injector further comprises a controlled valve controlling the pressure in said control chamber by opening or closing a discharge channel extending from the control chamber and opening into a cylindrical low-pressure return channel of greater section.
  • the return channel is provided with an enlarged zone into which the discharge channel opens so that the mechanical stresses associated with the passage of the pressurized fuel C and the cycles of the valve are reduced.
  • the widened zone of the return channel comprises a cylindrical section into which the discharge channel opens.
  • the cylindrical section of the widened zone widens into a conical section into which the discharge channel also opens, the angle of the cone being substantially equal to the angle between the axis of the channel of the discharge and the axis of the return channel.
  • the axis of the discharge channel is substantially parallel to a generatrix of the conical section.
  • a radial surface joins the return channel to the conical section which connects with the conical section along a connecting surface into which also the discharge channel opens. More specifically, the connecting surface is a leave forming a toric surface.
  • the return channel is widened only on a partial angular sector around the axis of the return channel, in which sector the discharge channel opens.
  • the invention also relates to a fuel injection device comprising an injector produced according to the preceding paragraphs
  • an injector 10 comprises a body 12 in which is arranged a solenoid valve 14 which controls the pressure in a control chamber 16 arranged upstream of the needle (not shown) of the injector 10.
  • a discharge channel 18 of very small section, of the order of one millimeter squared, extends axially along a discharge axis D of the control chamber 16 to a low pressure return channel 20 which extends, as for him, along a return axis R.
  • the return channel 20 of larger diameter than the discharge channel 18, is arranged axially sliding the shaft of the solenoid valve 14 which moves between a closed position in which it closes the discharge channel 18, and an open position in which it releases the outlet of the discharge channel 18, the high pressure fuel C can then flow to the return channel 20 in the direction of the arrows F of the figure 1 .
  • the two channels 18, 20, are cylindrical of revolution and the two axes D, R, are concurrent forming between them an acute angle A1. In a construction alternative, the axes may not be concurrent.
  • the section of the return channel 20 in the connection zone 22 of the two channels 18, 20 is increased relative to the section. base 24 of said channel 20.
  • connection zone 22 comprises first a section cylindrical 26 then flaring out into a conical section 28, whose cone angle A2 is substantially equal to the acute angle A1, and which ends with a toric section 30 connecting to the base section 24.
  • the toric section 30 firstly comprises a toric surface 32 of circular transverse profile connecting tangentially in "top” surface continuity with the conical section 26 and “below” with a radial surface 34 extending transversely to the return axis R to the base section 24. It will be noted on the figure 2 that said radial surface 34 may not be exactly transverse to the return axis R, but slightly inclined.
  • the three sections 26, 28, 30 are coaxial along the return axis R and the discharge channel 18 opens into the return channel 20 having a common intersection with each of the three sections 26, 28, 30.
  • the angle A2 of the conical section 26 is substantially equal to the acute angle A1 and the discharge channel 18 is arranged so that the discharge axis D is almost coincident with an edge of the conical section 30.
  • one half of the cross section of the discharge channel 18, pictorially designated the “high half” 36 is “external” to the conical section 28 and extends parallel “above” the cone to join the cylindrical section 26.
  • the "high” 36 and “low” halves 38 have been symbolically separated by a dashed line P.
  • the discharge channel 18 enters the connection zone 22 according to a closed intersection curve 40, represented by a center line on the figure 2 , comprising in the conical portion two parallel lines, or quasi, joined "up” in the cylindrical section by a two-cylinder part and, “down” in the O-ring, by another two-cylinder curve.
  • a closed intersection curve 40 represented by a center line on the figure 2 , comprising in the conical portion two parallel lines, or quasi, joined "up” in the cylindrical section by a two-cylinder part and, "down” in the O-ring, by another two-cylinder curve.
  • the sharp edges are broken by forming chamfers or fillet of connections 42.
  • the toric surface can be replaced by a conical surface forming a chamfer, or a surface of another shape, between the conical section and the radial surface.
  • the enlarged area may comprise only a cylindrical section.
  • connection zone 22 is a zone of complete revolution extending over 360 ° relative to the return axis R.
  • the connecting zone 22 is widened only on a reduced angular sector A3 and limited to what is necessary to arrange the penetration of the discharge channel 18. In that case, the left half of the figure 1 remains unchanged while in the right part the return channel 20 is not widened.

Landscapes

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

Claims (6)

  1. Dieselkraftstoffeinspritzer (10) mit einem Körper (12), wobei der Kraftstoff (C) unter Druck zwischen einem Einlass und einer über eine Düsennadel gesteuerten Einspritzdüse zirkuliert, wobei die Düsennadel unter der Wirkung der Druckdifferenz zwischen einem der Düsennadel vorgelagerten Steuerraum (16) und der nachgelagerten Einspritzdüse axial verstellbar ist, wobei der Einspritzer (10) ferner ein steuerbares Ventil (14) aufweist, das den Druck in dem Steuerraum (16) regelt, indem es einen Ablaufkanal (18) öffnet bzw. schließt, der sich von dem Steuerraum (16) aus erstreckt und in einen zylindrischen Niederdruckrücklaufkanal (20) mit größerem Querschnitt ausmündet, dadurch gekennzeichnet, dass der Rücklaufkanal (20) mit einem erweiterten Bereich (22) versehen ist, in welchen der Ablaufkanal (18) ausmündet, so dass die mit dem Durchfluss des Kraftstoffs (C) unter Druck und mit den Ventilzyklen des Ventils (14) zusammenhängenden mechanischen Spannungen vermindert werden, wobei
    der erweiterte Bereich (22) des Rücklaufkanals (20) einen zylindrischen Abschnitt (26) aufweist, in welchen der Ablaufkanal (18) ausmündet, und wobei der zylindrische Abschnitt (26) des erweiterten Bereichs (22) sich in einen konischen Abschnitt (28) aufweitet, in welchen auch der Ablaufkanal (18) ausmündet, wobei der Winkel (A2) des Konus im Wesentlichen gleich dem Winkel (A2) zwischen der Achse des Ablaufkanals (D) und der Achse des Rücklaufkanals (R) ist, so dass die Achse (D) des Ablaufkanals (22) im Wesentlichen parallel zu einer Mantellinie des konischen Abschnitts (28) verläuft.
  2. Einspritzer (10) nach Anspruch 1, wobei am Ende des erweiterten Bereichs (22) des Rücklaufkanals (20) eine radial verlaufende Fläche (34) den Rücklaufkanal (20) mit dem konischen Abschnitt (28) verbindet.
  3. Einspritzer (10) nach Anspruch 2, wobei der konische Abschnitt (28) und die radial verlaufende Fläche (34) entlang einer Anschlussfläche (32) aneinander anschließen, wo auch der Ablaufkanal (18) ausmündet.
  4. Einspritzer (10) nach Anspruch 3, wobei die Anschlussfläche (32) eine Auskehlung ist, die eine torische Fläche (32) bildet.
  5. Einspritzer (10) nach einem der vorangehenden Ansprüche, wobei der Rücklaufkanal (20) nur über einen Teilwinkelsektor (A3) um die Achse (R) des Rücklaufkanals herum erweitert ist, in welchen Sektor der Ablaufkanal (18) ausmündet.
  6. Kraftstoff-Einspritzvorrichtung (8) mit einem Einspritzer (10) nach einem der vorangehenden Ansprüche.
EP13169872.2A 2013-05-30 2013-05-30 Kraftstoffeinspritzer Active EP2808532B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13169872.2A EP2808532B1 (de) 2013-05-30 2013-05-30 Kraftstoffeinspritzer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13169872.2A EP2808532B1 (de) 2013-05-30 2013-05-30 Kraftstoffeinspritzer

Publications (2)

Publication Number Publication Date
EP2808532A1 EP2808532A1 (de) 2014-12-03
EP2808532B1 true EP2808532B1 (de) 2017-08-16

Family

ID=48520803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13169872.2A Active EP2808532B1 (de) 2013-05-30 2013-05-30 Kraftstoffeinspritzer

Country Status (1)

Country Link
EP (1) EP2808532B1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5192026A (en) * 1990-03-29 1993-03-09 Cummins Engine Company, Inc. Fuel injectors and methods for making fuel injectors
GB2285096B (en) * 1993-12-27 1997-12-03 Caterpillar Inc Method of operating a high-pressure apparatus such as a fuel injector
DE19826719A1 (de) * 1998-06-16 1999-12-23 Bosch Gmbh Robert Ventilsteuereinheit für ein Kraftstoffeinspritzventil
ITTO20010814A1 (it) * 2001-08-14 2003-02-14 Fiat Ricerche Iniettore di combustibile per un motore endotermico e relativo metododi fabbricazione.
GB0602742D0 (en) * 2005-06-06 2006-03-22 Delphi Tech Inc Machining method
DE102006036103A1 (de) * 2006-08-02 2008-02-07 Siemens Ag Kanalanordnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2808532A1 (de) 2014-12-03

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