EP0444053B1 - Kraftstoff-einspritzdüse für brennkraftmaschinen - Google Patents

Kraftstoff-einspritzdüse für brennkraftmaschinen Download PDF

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Publication number
EP0444053B1
EP0444053B1 EP89911536A EP89911536A EP0444053B1 EP 0444053 B1 EP0444053 B1 EP 0444053B1 EP 89911536 A EP89911536 A EP 89911536A EP 89911536 A EP89911536 A EP 89911536A EP 0444053 B1 EP0444053 B1 EP 0444053B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
spring
closing
stroke
injection nozzle
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.)
Expired - Lifetime
Application number
EP89911536A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0444053A1 (de
Inventor
Kurt Seifert
Karl Hofmann
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 EP0444053A1 publication Critical patent/EP0444053A1/de
Application granted granted Critical
Publication of EP0444053B1 publication Critical patent/EP0444053B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve

Definitions

  • the invention relates to a fuel injector for internal combustion engines of the type defined in the preamble of claim 1.
  • Such an injection nozzle with washer and bushing has the advantage that the tolerance range of the advance stroke of the valve needle, which is to be kept within narrow limits, is determined solely by the manufacturing tolerances on the pressure element and on the nozzle needle.
  • the forward stroke can therefore be measured precisely and adjusted by grinding the stop of the valve needle, which is generally formed by the free end of the valve needle. Measurement tolerances and / or changes occurring during operation or during assembly no longer affect the size of the advance stroke.
  • the shoulder fixed to the housing for supporting the second closing spring is created by a stepped design of the spring chamber, preferably as an axial step pocket bore.
  • the second closing spring lies against the ring shoulder formed between the bore sections with different bore diameters via an annular disk.
  • the pressure pin protrudes through a central opening in the ring disk and is acted upon by the first closing spring on the face side.
  • the two closing springs are graduated according to the two different diameters of the spring chamber.
  • the fuel injection nozzle according to the invention with the characterizing features of claim 1 has the advantage that the outer diameter of the nozzle holder can be made smaller without loss of strength.
  • the closing springs are identical in construction, the spring chamber has a constant diameter over the entire length, which can be kept relatively small.
  • the housing-fixed support of the closing spring close to the nozzle body takes place via a cross bolt crossing the spring chamber, so that the spring chamber available for the first closing spring can thus be fully used.
  • the cross bolt is inserted into a radial blind bore crossing the spring chamber and seals the spring chamber with an O-ring.
  • the cross bolt is fixed in the radial blind bore according to a further embodiment of the invention by a centering piece designed as a spring plate, by means of which the second closing spring, which is close to the nozzle body, is supported on the cross bolt.
  • the drawing shows a longitudinal section of a fuel injection nozzle for direct injection internal combustion engines.
  • the injection nozzle shown in longitudinal section in FIG. 1 has a nozzle body 10 which is clamped together with an intermediate washer 11 lying on the end face by a union nut 12 on a nozzle holder 13.
  • a valve needle 14 is axially displaceably mounted in the nozzle body 10 and cooperates with an inward-facing valve seat in the nozzle body 10 and controls a plurality of spray openings 15 located upstream of the valve seat.
  • the guide bore 16 of the valve needle 14 in the nozzle body 10 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 14 has a pressure shoulder.
  • the pressure chamber is via a channel 17 running in the nozzle holder 13 and only partially shown, with a nozzle 18 Nozzle holder 13 connected for connecting a fuel delivery line leading to a fuel injection pump.
  • the fuel pressure applied to the pressure shoulder of the valve needle 14 pushes the valve needle 14 upward against the graduated force curve of a closing spring arrangement described in the following, consisting of two helical compression springs, the valve needle 14 executing a preliminary stroke in a pre-injection phase and a residual stroke in a main injection phase, in which fuel via the Spray openings 15 is injected.
  • a spring chamber 19 is arranged coaxially to the valve needle 14, which is designed as an axial blind bore and is closed on its open end face by the intermediate disk 11.
  • a first closing spring 21 and a second closing spring 22 are arranged in series in the spring chamber 19.
  • the first closing spring 21, which is more distant from the nozzle body 10, constantly acts on the valve needle 14 in its closing direction via a pressure pin 23.
  • the first closing spring 21 is supported via a disk 20 on the base 30 of the spring chamber 19 and via a spring plate-like support element 31 on the end face of the pressure pin 23.
  • the support element 31 has a recess 32 on its end face, which receives the end end of the pressure pin 23 in a form-fitting manner.
  • the pressure pin 23 is axially displaceably guided in an intermediate bush 24 and abuts the free end of the valve needle 14 on the end face.
  • the intermediate bushing 24 is axially displaceably guided coaxially to the valve needle 14 in the intermediate disk 11 and carries a stop 25 and a counter stop 26.
  • the stop 25 formed by a radial annular shoulder acts with a counter stop 27 formed by a same shoulder on the intermediate disk 11 to limit the Total strokes of the valve needle 14 together.
  • the from the end face of the intermediate bush 24th Counter stop 26 formed interacts with a stop 28 formed by the end face of valve needle 14 to limit the forward stroke of valve needle 14.
  • the second closing spring 22 which is identical in construction to the first closing spring 21, is arranged in the spring chamber 19 of the first closing spring 21 towards the nozzle body 10 and coaxially surrounds the pressure pin 23. With one end face, the second closing spring 22 is supported on the intermediate bush 24 via a spring plate 29, which is thereby placed in the closed position of the valve needle 14 on the end face of the nozzle body 10, and with its other end, the second closing spring 22 presses via a centering piece 33 designed as a spring plate against a cross bolt 34 crossing the spring chamber 19.
  • the cross bolt 34 which is in the region the spring chamber 19 has a radial through opening 35 for the passage of the pressure pin 33 and a receptacle 36 for the centering piece 33 is inserted into a radial blind bore 37 which crosses the spring chamber 19.
  • a sealing ring 39 which is located in an annular groove 38 of the transverse bolt 34 and is designed as an O-ring, seals the spring chamber 19.
  • the transverse bolt 34 is fixed in the radial blind bore 37 by the contact pressure of the second closing spring 22, which secures the transverse bolt 34 in the spring chamber 19 against transverse displacement via the centering piece 33 and the receptacle 36.
  • the spring chamber 19 is still connected via a channel 40 to a connecting nipple 41 for a leakage oil line.
  • the valve needle 14 performs a preliminary stroke h v , in which only the first closing spring 21 acts as a counterforce.
  • a limited pre-injection quantity is injected from the injection openings 15.
  • the preliminary stroke h v is ended when the stop 28 on the valve needle 14 comes to rest against the counter stop 26 of the intermediate bush 24.
  • the valve needle 14 remains in this position until the rising one Fuel pressure now overcomes the opposing forces of both closing springs 21, 22.
  • the valve needle 14 together with the intermediate bush 24 is moved further in the opening direction until it has completed its total stroke after the remaining stroke h v . This is limited by the counter stop 27 on the intermediate plate 11, on which the stop 25 strikes the intermediate bush 24. Due to the identical design of the two closing springs 21, 22 and the support of the second closing spring 22 on a transverse bolt inserted in the spring chamber 16, the diameter of the spring chamber 19 can be kept very small and the injection nozzle can thus be made relatively slim overall.
  • the intermediate plate 11 can thus also be formed from two individual plates, of which the lower individual plate has a larger inner diameter than the upper one.
  • the counter-stop 27 for limiting the total stroke of the valve needle 14 is formed by the area in the upper single disk not covered by the lower single disk. In this embodiment of the intermediate disk 11, the total stroke of the valve needle 14 can also be easily adjusted to the desired value by appropriate selection of the disk thickness of the lower individual disk.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP89911536A 1988-11-18 1989-10-19 Kraftstoff-einspritzdüse für brennkraftmaschinen Expired - Lifetime EP0444053B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839038A DE3839038A1 (de) 1988-11-18 1988-11-18 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3839038 1988-11-18

Publications (2)

Publication Number Publication Date
EP0444053A1 EP0444053A1 (de) 1991-09-04
EP0444053B1 true EP0444053B1 (de) 1993-03-03

Family

ID=6367434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911536A Expired - Lifetime EP0444053B1 (de) 1988-11-18 1989-10-19 Kraftstoff-einspritzdüse für brennkraftmaschinen

Country Status (4)

Country Link
EP (1) EP0444053B1 (ja)
JP (1) JPH04501752A (ja)
DE (2) DE3839038A1 (ja)
WO (1) WO1990005844A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005774A1 (de) * 1990-02-23 1991-08-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE4101235C1 (ja) * 1991-01-17 1992-06-04 Robert Bosch Gmbh, 7000 Stuttgart, De
GB9323236D0 (en) * 1993-11-11 1994-01-05 Lucas Ind Plc Fuel injection nozzle
DE19638339B4 (de) * 1996-09-19 2008-10-02 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554987A1 (de) * 1975-12-06 1977-06-16 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3610658A1 (de) * 1985-11-21 1987-05-27 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
JPH04501752A (ja) 1992-03-26
WO1990005844A1 (de) 1990-05-31
DE58903686D1 (de) 1993-04-08
EP0444053A1 (de) 1991-09-04
DE3839038A1 (de) 1990-05-23

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