EP2808532A1 - Kraftstoffeinspritzer - Google Patents

Kraftstoffeinspritzer Download PDF

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Publication number
EP2808532A1
EP2808532A1 EP13169872.2A EP13169872A EP2808532A1 EP 2808532 A1 EP2808532 A1 EP 2808532A1 EP 13169872 A EP13169872 A EP 13169872A EP 2808532 A1 EP2808532 A1 EP 2808532A1
Authority
EP
European Patent Office
Prior art keywords
injector
channel
discharge channel
return channel
fuel
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
EP13169872.2A
Other languages
English (en)
French (fr)
Other versions
EP2808532B1 (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
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 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
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 very small section discharge channel generally less than 1 mm in diameter by which the fuel of the control chamber can be discharged to the low pressure.
  • 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 enlarged area 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 discharge channel 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 “upper 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)
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 true EP2808532A1 (de) 2014-12-03
EP2808532B1 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)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449662A1 (de) * 1990-03-29 1991-10-02 Cummins Engine Company, Inc. Kraftstoffeinspritzdüse und Verfahren zum Entlasten von Spannungskonzentration in einer Einspritzdüsenbohrung
GB2285096A (en) * 1993-12-27 1995-06-28 Caterpillar Inc Formation of interconected high pressure passages
DE19826719A1 (de) * 1998-06-16 1999-12-23 Bosch Gmbh Robert Ventilsteuereinheit für ein Kraftstoffeinspritzventil
EP1284358A2 (de) * 2001-08-14 2003-02-19 C.R.F. Società Consortile per Azioni Verbrennungsmotorskraftstoffeinspritzventil und Verfahren zu dessen Herstellung
WO2006131741A2 (en) * 2005-06-06 2006-12-14 Delphi Technologies, Inc. Machining method
DE102006036103A1 (de) * 2006-08-02 2008-02-07 Siemens Ag Kanalanordnung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449662A1 (de) * 1990-03-29 1991-10-02 Cummins Engine Company, Inc. Kraftstoffeinspritzdüse und Verfahren zum Entlasten von Spannungskonzentration in einer Einspritzdüsenbohrung
GB2285096A (en) * 1993-12-27 1995-06-28 Caterpillar Inc Formation of interconected high pressure passages
DE19826719A1 (de) * 1998-06-16 1999-12-23 Bosch Gmbh Robert Ventilsteuereinheit für ein Kraftstoffeinspritzventil
EP1284358A2 (de) * 2001-08-14 2003-02-19 C.R.F. Società Consortile per Azioni Verbrennungsmotorskraftstoffeinspritzventil und Verfahren zu dessen Herstellung
WO2006131741A2 (en) * 2005-06-06 2006-12-14 Delphi Technologies, Inc. Machining method
DE102006036103A1 (de) * 2006-08-02 2008-02-07 Siemens Ag Kanalanordnung

Also Published As

Publication number Publication date
EP2808532B1 (de) 2017-08-16

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