EP0300198A1 - Buse d'injection de combustible pour moteur à combustion interne - Google Patents

Buse d'injection de combustible pour moteur à combustion interne Download PDF

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Publication number
EP0300198A1
EP0300198A1 EP88109606A EP88109606A EP0300198A1 EP 0300198 A1 EP0300198 A1 EP 0300198A1 EP 88109606 A EP88109606 A EP 88109606A EP 88109606 A EP88109606 A EP 88109606A EP 0300198 A1 EP0300198 A1 EP 0300198A1
Authority
EP
European Patent Office
Prior art keywords
valve needle
armature
injection nozzle
nozzle
needle
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.)
Withdrawn
Application number
EP88109606A
Other languages
German (de)
English (en)
Inventor
Karl Ing.-Grad. Hoffmann
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 EP0300198A1 publication Critical patent/EP0300198A1/fr
Withdrawn legal-status Critical Current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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
  • Injection nozzles of this type have the advantage that the absence of a residual air gap means that a more pronounced signal can be achieved than in those designs in which a residual air gap caused by manufacturing tolerances must be accepted due to the lack of an elastic spring element. It is particularly advantageous that the initial air gap can already be kept very small, so that the armature strikes the magnetic core when the valve needle has, for example, only completed a quarter or an eighth of its total opening stroke. This ensures that the signaling that is compressed for the shortest possible time actually takes place at the beginning of the opening stroke and at the end of the closing stroke of the valve needle.
  • the spring element which is elastically compressible in the nozzle axis direction acts on the displaceably mounted magnetic core and is accommodated in a chamber of the nozzle holder, which is between the induction coil and the connection-side end face of the Nozzle holder is arranged.
  • the above-described advantage of improved signaling is bought by an increased space requirement in the axial direction of the injection nozzle, which is particularly important when the electrical connection contacts of the induction coil are also arranged axially and the signal lines leading there are guided in approximately the same direction out of the nozzle holder should be.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that a space between the induction coil and the connection-side end face of the nozzle holder is not required for the elastically compressible spring element, so that the nozzle holder is either dimensioned shorter in the axial direction or the space not required can be used to accommodate the connection elements of the induction coil.
  • FIG. 1 shows a longitudinal section through the exemplary embodiment
  • FIG. 2 shows an enlarged variant of the injection nozzle according to FIG. 1.
  • the injection nozzle has a nozzle holder 10, against which an intermediate plate 11 and a nozzle body 12 are clamped by a union nut 13.
  • a guide bore 14 for receiving a valve needle 15 and a valve seat 16 are formed, which cooperates with a sealing cone 17 on the valve needle 15.
  • a needle shaft 18 Connected to the sealing cone 17 is a needle shaft 18, which is larger in diameter and slides in the guide bore 14, and a pressure pin 19.
  • On the pressure pin 19 sits a pressure piece 20, which engages around the pressure pin 19 with the required movement play with a ring collar pointing downward.
  • the annular shoulder 21 formed between the needle shaft 18 and the pressure pin 19 on the valve needle 15 is removed from the intermediate plate 11 by the dimension h when the valve needle 15 is seated on the valve seat 16, which corresponds to the total stroke of the valve needle 15 delimited by the intermediate plate 11.
  • an open end space 22 with a shoulder 23 and a smaller diameter blind bore 24 are recessed.
  • An induction coil 26 provided with a magnetically conductive housing 25, a plate 27 and a closing spring 28 for the valve needle 15 are inserted into the spring chamber 22.
  • the closing spring 28 engages on the pressure piece 20 and is supported on the shoulder 23 of the nozzle holder 10 via the plate 27, the housing 25 and an annular flange 29 of a magnetic core 30 passing through the induction coil 26.
  • the induction coil 26 is simultaneously held securely on the shoulder 23 and the plate 27 pressed against the open end edge of the housing 25.
  • the housing 25 and the magnetic core 30 together with the ring flange 29 are made of soft iron and form sections of a magnetic circuit which also leads via an armature 32 also made of soft iron and an air gap formed between the latter and the magnetic core 30 in the closed position of the valve needle 15.
  • the armature 32 is guided in an exactly displaceable manner in the housing 25 and is coupled to the valve needle 15 via a driving pin 33 which is firmly connected to the pressure piece 20. With its upper front end, the driving pin 33 provided there with an annular collar 34 plunges into a chamber 35 of the armature 32, the inlet opening of which is provided with a collar 36 which engages under the annular collar 34.
  • a helical compression spring 38 is arranged, which is supported on the pressure piece 20 and acts on the collar 36 of the armature 32. In the closed position of the valve needle 15, the helical compression spring 38 presses the collar 36 against the annular collar 34 of the driver bolt 33.
  • the initial air gap between the armature 32 and the magnetic core 33 is dimensioned much smaller than the opening stroke of the valve needle 15.
  • the depth of the chamber 35 in the armature 32 is dimensioned such that the axial play of the collar 34 in the chamber 32 is greater than the difference between the Opening stroke of the valve needle 15 and the initial air gap between armature 32 and magnetic core 30 is.
  • the fuel supplied passes through bores 40 and 41 in the nozzle holder 10 into an end annular groove 42 of the intermediate plate 11 and from there further via a bore 43 in the intermediate plate 11, an annular groove 44 and a bore 45 in the nozzle body 12 into a pressure chamber 46, which the Valve needle 15 in the region of a pressure shoulder 47 gives. From the pressure chamber 46, the fuel passes through the valve 16, 17 into a spray opening 48 and from there into the combustion chamber of the engine.
  • the amount of leakage oil reaching the spring chamber 22 via the guide gap of the valve needle 15 can be discharged via a leakage oil channel, not shown in the drawing, into a connection stub, likewise not visible, for an external leakage oil line.
  • the induction coil 26 is connected via connecting means 49 and a connecting cable 50 to a direct current source and a device for evaluating the voltages induced in operation in the induction coil and superimposed on an applied direct voltage.
  • a direct current source and a device for evaluating the voltages induced in operation in the induction coil and superimposed on an applied direct voltage.
  • the initial air gap is shortened to the value 0, so that there is a clearly pronounced sudden change in the magnetic flux and the resulting voltage at exactly the right time.
  • collar 34 moves upward in chamber 35 of armature 32, helical compression spring 38 being correspondingly axially compressed.
  • the armature 32 initially remains in contact with the magnetic core 30 by means of the helical compression spring 38 until the collar 34 is placed on the collar 36 and then pulls the armature 32 back into the starting position.
  • the evaluation circuit is again supplied with a distinct signal.
  • a spring element 52 which is elastically compressible in the nozzle axis direction is arranged in the chamber 35 of the armature 32, so that a helical compression spring surrounding the driving pin 33 is omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP88109606A 1987-07-24 1988-06-16 Buse d'injection de combustible pour moteur à combustion interne Withdrawn EP0300198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3724545 1987-07-24
DE19873724545 DE3724545A1 (de) 1987-07-24 1987-07-24 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
EP0300198A1 true EP0300198A1 (fr) 1989-01-25

Family

ID=6332287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109606A Withdrawn EP0300198A1 (fr) 1987-07-24 1988-06-16 Buse d'injection de combustible pour moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP0300198A1 (fr)
JP (1) JPS6436975A (fr)
KR (1) KR890002535A (fr)
DE (1) DE3724545A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006439A1 (fr) * 1988-11-30 1990-06-14 Robert Bosch Gmbh Injecteur pour moteurs a combustion interne
US5801106A (en) * 1996-05-10 1998-09-01 Kimberly-Clark Worldwide, Inc. Polymeric strands with high surface area or altered surface properties
US5803106A (en) * 1995-12-21 1998-09-08 Kimberly-Clark Worldwide, Inc. Ultrasonic apparatus and method for increasing the flow rate of a liquid through an orifice
US5868153A (en) * 1995-12-21 1999-02-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid flow control apparatus and method
US6020277A (en) * 1994-06-23 2000-02-01 Kimberly-Clark Corporation Polymeric strands with enhanced tensile strength, nonwoven webs including such strands, and methods for making same
US6053424A (en) * 1995-12-21 2000-04-25 Kimberly-Clark Worldwide, Inc. Apparatus and method for ultrasonically producing a spray of liquid
US6380264B1 (en) 1994-06-23 2002-04-30 Kimberly-Clark Corporation Apparatus and method for emulsifying a pressurized multi-component liquid
US6395216B1 (en) 1994-06-23 2002-05-28 Kimberly-Clark Worldwide, Inc. Method and apparatus for ultrasonically assisted melt extrusion of fibers
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097859A (en) * 1981-05-06 1982-11-10 Bosch Gmbh Robert A fuel injection nozzle for combustion engines
DE3137761A1 (de) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097859A (en) * 1981-05-06 1982-11-10 Bosch Gmbh Robert A fuel injection nozzle for combustion engines
DE3137761A1 (de) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006439A1 (fr) * 1988-11-30 1990-06-14 Robert Bosch Gmbh Injecteur pour moteurs a combustion interne
US5161742A (en) * 1988-11-30 1992-11-10 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US6020277A (en) * 1994-06-23 2000-02-01 Kimberly-Clark Corporation Polymeric strands with enhanced tensile strength, nonwoven webs including such strands, and methods for making same
US6380264B1 (en) 1994-06-23 2002-04-30 Kimberly-Clark Corporation Apparatus and method for emulsifying a pressurized multi-component liquid
US6395216B1 (en) 1994-06-23 2002-05-28 Kimberly-Clark Worldwide, Inc. Method and apparatus for ultrasonically assisted melt extrusion of fibers
US5803106A (en) * 1995-12-21 1998-09-08 Kimberly-Clark Worldwide, Inc. Ultrasonic apparatus and method for increasing the flow rate of a liquid through an orifice
US5868153A (en) * 1995-12-21 1999-02-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid flow control apparatus and method
US6053424A (en) * 1995-12-21 2000-04-25 Kimberly-Clark Worldwide, Inc. Apparatus and method for ultrasonically producing a spray of liquid
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method
US6659365B2 (en) 1995-12-21 2003-12-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid fuel injection apparatus and method
US5801106A (en) * 1996-05-10 1998-09-01 Kimberly-Clark Worldwide, Inc. Polymeric strands with high surface area or altered surface properties

Also Published As

Publication number Publication date
DE3724545A1 (de) 1989-02-02
KR890002535A (ko) 1989-04-10
JPS6436975A (en) 1989-02-07

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