EP0030258B1 - Kraftstoffeinspritzdüse für Brennkraftmaschinen - Google Patents

Kraftstoffeinspritzdüse für Brennkraftmaschinen Download PDF

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Publication number
EP0030258B1
EP0030258B1 EP80106065A EP80106065A EP0030258B1 EP 0030258 B1 EP0030258 B1 EP 0030258B1 EP 80106065 A EP80106065 A EP 80106065A EP 80106065 A EP80106065 A EP 80106065A EP 0030258 B1 EP0030258 B1 EP 0030258B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
spring
fuel
pressure spring
stroke
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
Application number
EP80106065A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0030258A1 (de
Inventor
Kurt Seifert
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
Priority to AT80106065T priority Critical patent/ATE11690T1/de
Publication of EP0030258A1 publication Critical patent/EP0030258A1/de
Application granted granted Critical
Publication of EP0030258B1 publication Critical patent/EP0030258B1/de
Expired 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
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the invention is based on an injection nozzle according to the preamble of the independent claim.
  • a known injection nozzle of this type CH-A-329 505, Figure 6
  • the first compression spring is supported on a spring plate which is pressed against a stop fixed to the housing by the second compression spring in the closed position and during a first partial stroke of the valve needle.
  • the second compression spring is arranged between the control point for the fuel passage and the first compression spring.
  • the first compression spring is weaker than the second compression spring and engages the retaining ring of the valve needle via a bell-shaped body, which comes into contact with the spring plate after the first partial stroke of the valve needle.
  • the first compression spring is then short-circuited and the valve needle is acted upon by the second, stronger compression spring in the closing direction.
  • This design is relatively complex and differs considerably from a standard design used in many types of injection nozzles of an assembly consisting of a nozzle body, valve needle, closing spring and retaining ring.
  • the fuel supply line opens from the side into the space of the injection nozzle that receives the compression springs, so that the housing parts also deviate from the design with injection valve with the valve needle opening outwards, with an axial opening of the fuel supply line.
  • a throttle point is not provided in the fuel passage, but in the spring plate, so that in some cases advantageous, precise stroke-dependent control of the throttle point is not possible.
  • the arrangement according to the invention with the characterizing features of the independent patent claim has the advantage that an assembly already made for other types of injection nozzles in large series, consisting of a nozzle body, valve needle with retaining ring and a constant compression spring acting in the closing direction, can be used for the purpose the pressure stage generation is only supplemented by additional components. These additional components are all arranged upstream of the assembly mentioned, so that the assembly can be kept unchanged and the diameter of the injection nozzle does not have to be increased.
  • the arrangement of the throttle point in the fuel passage and its stroke-dependent control by the valve needle means that with small injection quantities, an injection time extension and thus a quieter running of the internal combustion engine is achieved.
  • the fuel is better processed with the smaller quantities injected in the idling and part-load range, which results in a decrease in the specific fuel consumption and a decrease in the toxic components in the exhaust gas.
  • the throttle point is switched off, so that there is no throttle loss due to the larger passage cross-section with sufficient fuel preparation.
  • the special design of the spring plate also ensures that, even in this operating range, the fuel can flow largely unthrottled into the space accommodating the closing spring.
  • the fuel injector shown is shown partly in section, partly in external view, in order to provide a better overview of the proportions.
  • a shaft-shaped nozzle body 1 is clamped to a nozzle holder 5 by a union nut 2 with the interposition of a sleeve 3 and a stop ring 4.
  • the union nut 2 is dash-dotted and the nozzle holder 5 is only partially shown.
  • a valve group is directly attached to the nozzle body 1 and consists of a valve needle 6, a closing spring 7, a spring plate 8 and a retaining ring 9.
  • the retaining ring 9 is suspended in an annular groove 10 of the valve needle via a keyhole, not shown.
  • the closing spring 7 is supported by washers 11 on a shoulder 12 of the nozzle body 1 on the one hand and on the other hand on the spring plate 8.
  • the head 13 of the valve needle is pressed by the spring 7 with a conical surface 14 onto a conical valve seat 15 arranged on the nozzle body 1.
  • the cone 14 is adjoined by a cylindrical section 16 on the valve needle, which, together with the inner bore 17 of the nozzle body 1 receiving the valve needle 6, delimits a throttle point D. As soon as the fuel injection nozzle is fully open, this collar 16 emerges from the bore 17, so that the throttle cross section is eliminated.
  • a spring plate 18 of a second compression spring 19 engages on the retaining ring 9 on the side facing away from the injection side and is supported on the side facing away from the spring plate via a washer 20 on the nozzle holder 21.
  • the spring plate 18 is provided with a hollow hub passing through the inner bore of the stop ring 4 with play, which is downstream of the valve striking surface of this spring plate has 18 openings in its wall. In this way, largely unthrottled fuel feedthrough is made possible in spite of the narrow space available. As soon as fuel under pressure passes through a pressure channel 22 into the fuel injector interior 23, it flows through a pressure bore 24 in the nozzle body 1 to the spray opening.
  • valve needle If the pressure in the interior 23 is sufficiently high, the valve needle is supported by the spring 19, but is displaced against the force of the closing spring 7 until the spring plate 18 of the spring 19 abuts the stop ring 4. During this advance stroke, the collar 16 does not yet emerge from the inner bore 17, so that the throttle point D is fully effective during the injection. After the pressure increase has compensated for the failing spring 19, the valve needle 6 is displaced further against the spring 7, after which the collar 16 emerges from the bore 17 and this throttling effect is switched off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP80106065A 1979-12-05 1980-10-07 Kraftstoffeinspritzdüse für Brennkraftmaschinen Expired EP0030258B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106065T ATE11690T1 (de) 1979-12-05 1980-10-07 Kraftstoffeinspritzduese fuer brennkraftmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2948907 1979-12-05
DE19792948907 DE2948907A1 (de) 1979-12-05 1979-12-05 Kraftstoffeinspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0030258A1 EP0030258A1 (de) 1981-06-17
EP0030258B1 true EP0030258B1 (de) 1985-02-06

Family

ID=6087661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106065A Expired EP0030258B1 (de) 1979-12-05 1980-10-07 Kraftstoffeinspritzdüse für Brennkraftmaschinen

Country Status (5)

Country Link
US (1) US4410141A (OSRAM)
EP (1) EP0030258B1 (OSRAM)
JP (1) JPS5688960A (OSRAM)
AT (1) ATE11690T1 (OSRAM)
DE (2) DE2948907A1 (OSRAM)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3149276A1 (de) * 1981-12-12 1983-06-23 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoff-einspritzduese fuer brennkraftmaschinen"
US4513916A (en) * 1982-10-14 1985-04-30 Lucas Industries Fuel injection nozzle
GB2128677B (en) * 1982-10-22 1985-10-02 Lucas Ind Plc Fuel injection nozzle for i c engines
GB2138884B (en) * 1983-04-26 1987-02-18 Maschf Augsburg Nuernberg Ag I c engine fuel injection nozzle
GB8313903D0 (en) * 1983-05-19 1983-06-22 Lucas Ind Plc Fuel injection nozzles
DE3318887A1 (de) * 1983-05-25 1984-11-29 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3405161A1 (de) * 1984-02-14 1985-08-22 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
GB8528920D0 (en) * 1985-11-23 1986-01-02 Lucas Ind Plc Fuel injection nozzle
DE3719459A1 (de) * 1987-06-11 1988-12-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE4444363A1 (de) * 1994-12-14 1996-06-20 Bosch Gmbh Robert Mehrstrahl-Kraftstoffeinspritzdüse

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB320301A (en) * 1929-01-28 1929-10-10 Constantine Tennyson Improvements in or relating to fuel injection valves for mechanical injection of fuel in internal combustion engines
GB431114A (en) * 1934-12-13 1935-07-01 Aage Christian Jensen Improvements in fuel injection valves for internal combustion engines
DE828329C (de) * 1949-07-13 1952-01-17 Jean Tilliet Vorrichtung zur Betaetigung des Verschlussorgans von Brennstoffinjektoren fuer Waermekraftmaschinen
CH329505A (de) * 1955-02-23 1958-04-30 Saurer Ag Adolph Verfahren zum Steuern des Durchflussquerschnittes von Einspritzdüsen für Brennkraftmaschinen und Einspritzdüse zur Durchführung des Verfahrens
DE2711393A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
JPS591102Y2 (ja) * 1978-03-09 1984-01-12 株式会社ボッシュオートモーティブ システム ノズルホルダ
DE2812519C2 (de) * 1978-03-22 1984-05-30 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Kraftstoffeinspritzdüse mit Nadelhubsteuerung für direkt einspritzende Brennkraftmaschinen
DE2825982A1 (de) * 1978-06-14 1980-01-03 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
JPS5688960A (en) 1981-07-18
JPH0226063B2 (OSRAM) 1990-06-07
ATE11690T1 (de) 1985-02-15
US4410141A (en) 1983-10-18
EP0030258A1 (de) 1981-06-17
DE3070120D1 (en) 1985-03-21
DE2948907A1 (de) 1981-06-11

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