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EP0698182A1 - Injecteur pour moteurs a combustion interne - Google Patents

Injecteur pour moteurs a combustion interne

Info

Publication number
EP0698182A1
EP0698182A1 EP95910416A EP95910416A EP0698182A1 EP 0698182 A1 EP0698182 A1 EP 0698182A1 EP 95910416 A EP95910416 A EP 95910416A EP 95910416 A EP95910416 A EP 95910416A EP 0698182 A1 EP0698182 A1 EP 0698182A1
Authority
EP
European Patent Office
Prior art keywords
spring
injection nozzle
helical compression
valve needle
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.)
Ceased
Application number
EP95910416A
Other languages
German (de)
English (en)
Inventor
Klaus Ellwanger
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 EP0698182A1 publication Critical patent/EP0698182A1/fr
Ceased legal-status Critical Current

Links

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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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 relates to a fuel injection nozzle for internal combustion engines, in particular diesel internal combustion engines.
  • the force of the closing spring which is designed as a helical compression spring, is transmitted via a spring plate to a pressure pin on the valve needle, which is offset in diameter from the shaft of the valve needle and which is freely accessible through a through hole in an intermediate disk between the nozzle body and the nozzle holder in the spring space of the nozzle holder protrudes.
  • the pressure pin engages in a blind hole in the spring plate and centers it so that it does not come into contact with its circumference on the inner wall of the spring chamber.
  • an injection nozzle is also known, which is basically constructed similarly to that described above, but in which, in addition, a piston device acted upon by fuel pressure in the intermediate disc exerts an additional force on the valve needle after a preliminary stroke in the closing direction.
  • the pressure pin on the valve needle is replaced by a pressure pin or pressure pin, but the spring plate has the same shape as in the injection nozzle described at the beginning.
  • This design is related to the arrangement of the additional piston device, so it has nothing to do with a value design of the pressure transmission device.
  • the invention has for its object to provide an injection nozzle in which the pressure transmission device acted upon by the helical compression spring is of simple design, so that it can be produced with little material and processing effort.
  • the solution to this problem is specified in claim 1.
  • the injection nozzle according to the invention has the advantage that both the spring plate and the pressure pin can be manufactured with a few simple machining measures. There is also the advantage that the preload of the helical compression spring which determines the opening pressure of the injection nozzle can be set in a simple manner by selecting a spring plate with a certain thickness and / or a pressure pin with a certain length.
  • the spring plate which has two plane-parallel end faces, is particularly easy to produce if it is used for axial guidance in the Blind bore of the nozzle holder has a fully cylindrical shape.
  • FIG. 1 shows an injection nozzle in longitudinal section
  • FIG. 2 shows the closing spring and the pressure transmission device of the injection nozzle according to FIG. 1 on an enlarged scale.
  • the injection nozzle has a nozzle body 11 which is clamped together with an intermediate disk 12 with a union nut 13 on a nozzle holder 14.
  • a valve needle 15 is slidably mounted in the nozzle body 11 and cooperates with a valve seat 16 which is turned inwards and which is arranged in front of a plurality of spray openings 17 in the nozzle body 11.
  • the guide bore for the shaft 18 of the valve needle 15 is expanded at one point to a pressure chamber 21, in the area of which the valve needle 15 has a pressure shoulder 19 and which via a channel 22 and a filter body 23 with a connecting piece 24 on the nozzle holder 14 for connecting a force material line is connected.
  • a spring chamber in the form of a blind bore 28 open towards the intermediate disk 12 is formed to receive a closing spring designed as a helical compression spring 27, on the bottom of which the helical compression spring 27 is supported with one end via an annular disk 29. With its other end, which is close to the intermediate disk 12, the helical compression spring 27 presses the valve needle 15 with a certain pretension onto the valve seat 16 via a pressure transmission device 30. In this closed position, the end of the valve needle 15, which is designed as a flat end face 20, is close to the intermediate disk 12 , from the washer 12 a distance which corresponds to the full stroke of the valve needle 15.
  • the pressure transmission device 30 consists of a spring plate 31, on which the closing spring 27 is supported with its other end, and of a pressure pin 32, which passes through the washer 12 and at one end 33 of the spring plate 31, which protrudes into the blind bore 27, and at the other end thereof End 34, the valve needle 15 rest with the end face 20.
  • the pressure pin 32 has the shape of a cylinder, the diameter of which is slightly smaller than that of the valve needle 15 and is guided axially displaceably in a through hole 35 in the intermediate disk 12.
  • the spring plate 31 also has the shape of a cylinder, the diameter of which is adapted to the inside diameter of the blind bore 28 with guide play, so that the spring plate 31 is guided axially displaceably in the blind bore 28.
  • the guide play between the spring plate 31 and the blind bore 28 of the nozzle holder 14 and between the pressure pin 32 and the through hole 35 in the intermediate plate 12 are dimensioned such that axial guidance is ensured and that leakage oil escaping from the valve needle side through the clearance gap without great throttling can enter the blind bore 28, which is relieved of pressure by a leakage oil channel 25.
  • recesses in the circumference or openings in the spring plate or in the pressure pin can also be provided.
  • the two end faces 36, 37 of the spring plate 31 designed as a disk are completely flat and plane-parallel.
  • the ratio of the thickness of the spring plate 31 to its diameter is in the range from 1: 3 to 1: 6, preferably 1: 5 and the ratio of the diameter of the pressure pin 32 to the diameter of the spring plate 31 is in the range from 1: 3 to 1: 6, preferably 1: 4.

Landscapes

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

Abstract

Un injecteur de carburant pour moteurs à combustion interne comprend un corps (11) serré dans un porte-injecteur (14) au moyen d'une rondelle intermédiaire (12). Une aiguille d'injection (15) est poussée par la force d'un ressort de fermeture (27) contre un siège de soupape (16) dans le corps (11) de l'injecteur. Le ressort de fermeture est constitué d'un ressort cylindrique de compression monté dans un trou borgne (28) du porte-injecteur. Une coupelle de ressort (31) plate cylindrique à faces planes parallèles (36, 37), ainsi qu'une tige de pression cylindrique (32) guidée mobile dans un passage débouchant (35) de la rondelle intermédiaire (12), forment un agencement de transmission de pression (30) entre le ressort de fermeture et l'aiguille d'injection (15).
EP95910416A 1994-03-11 1995-02-25 Injecteur pour moteurs a combustion interne Ceased EP0698182A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4408245A DE4408245A1 (de) 1994-03-11 1994-03-11 Einspritzdüse für Brennkraftmaschinen
DE4408245 1994-03-11
PCT/DE1995/000245 WO1995024552A1 (fr) 1994-03-11 1995-02-25 Injecteur pour moteurs a combustion interne

Publications (1)

Publication Number Publication Date
EP0698182A1 true EP0698182A1 (fr) 1996-02-28

Family

ID=6512515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95910416A Ceased EP0698182A1 (fr) 1994-03-11 1995-02-25 Injecteur pour moteurs a combustion interne

Country Status (7)

Country Link
EP (1) EP0698182A1 (fr)
JP (1) JPH08510530A (fr)
KR (1) KR960702059A (fr)
CN (1) CN1124052A (fr)
BR (1) BR9505860A (fr)
DE (1) DE4408245A1 (fr)
WO (1) WO1995024552A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29519296U1 (de) * 1995-12-06 1997-04-03 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19608575B4 (de) * 1996-03-06 2005-10-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19720891A1 (de) 1997-05-17 1998-11-19 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10041675A1 (de) 2000-08-24 2002-03-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10048597A1 (de) 2000-09-30 2002-04-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
RU2292480C2 (ru) * 2003-10-24 2007-01-27 Военный автомобильный институт Форсунка для впрыскивания топлива при бессливном процессе топливоподачи
DE102004002286A1 (de) * 2004-01-16 2005-08-11 Man B & W Diesel Ag Kraftstoffeinspritzdüse
CN100593081C (zh) * 2005-02-18 2010-03-03 罗伯特·博世有限公司 喷嘴

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR808907A (fr) * 1936-07-10 1937-02-18 Pompe à combustibles pour moteurs à combustion interne, pourvue de pulvérisateursen aiguille
US3499607A (en) * 1968-05-07 1970-03-10 Bendix Corp Fuel injection valve device
US3820723A (en) * 1973-03-21 1974-06-28 Deere & Co Fuel injection nozzle for internal combustion engine and the like
DE2755222A1 (de) * 1977-12-10 1979-06-13 Volkswagenwerk Ag Kraftstoffeinspritzeinrichtung, insbesondere fuer dieselbrennkraftmaschinen
US4465231A (en) * 1982-03-29 1984-08-14 Deere & Company Control device and method for activating a fuel injector nozzle
AT388782B (de) * 1985-03-04 1989-08-25 Steyr Daimler Puch Ag Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3611316A1 (de) * 1986-04-04 1987-10-08 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9524552A1 *

Also Published As

Publication number Publication date
KR960702059A (ko) 1996-03-28
DE4408245A1 (de) 1995-09-14
CN1124052A (zh) 1996-06-05
JPH08510530A (ja) 1996-11-05
WO1995024552A1 (fr) 1995-09-14
BR9505860A (pt) 1996-02-21

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