EP0240693A1 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0240693A1
EP0240693A1 EP87102772A EP87102772A EP0240693A1 EP 0240693 A1 EP0240693 A1 EP 0240693A1 EP 87102772 A EP87102772 A EP 87102772A EP 87102772 A EP87102772 A EP 87102772A EP 0240693 A1 EP0240693 A1 EP 0240693A1
Authority
EP
European Patent Office
Prior art keywords
piston
valve needle
injection nozzle
fuel
housing
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
EP87102772A
Other languages
German (de)
English (en)
Other versions
EP0240693B1 (fr
Inventor
Ewald Dr. Eblen
Paul Dipl.-Ing. Füssner
Karl Hofmann
Günter Kapolke
Edgar Schneider
Max Dr. Straubel
Werner Wagner
Klaus Wolf
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 EP0240693A1 publication Critical patent/EP0240693A1/fr
Application granted granted Critical
Publication of EP0240693B1 publication Critical patent/EP0240693B1/fr
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
    • 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
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/161—Means for adjusting injection-valve lift

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • Injectors of this type are used for targeted pre-injection by means of pre-stroke control to reduce the combustion noise.
  • a known injection nozzle of the type mentioned (DE-A1 27 11 902)
  • the second pressure chamber and the piston which exerts an additional closing force on the valve needle after a forward stroke of the valve needle, between the chamber receiving the closing spring and the fuel connection piece in the holding body arranged.
  • the piston is firmly connected to a plunger, which is guided through the closing spring up to the pre-stroke dimension to a pressure piece, via which the closing spring acts on the valve needle.
  • This arrangement of the second pressure chamber and the piston requires an axial extension of the injection nozzle compared to a version without an additional piston for the pre-stroke control.
  • the actual values of the preliminary stroke and the total stroke are influenced by a large number of tolerances on different parts of the injection nozzle, so that the required close tolerance of the strokes necessitates an increased production outlay.
  • injection nozzles for pre-injection and main injection are known (DE-A1 25 55 019), in which pin-shaped pistons acted upon by fuel in the opening direction of the valve needle are displaceably mounted in the intermediate disc, which counteract the closing spring during the pre-stroke of the valve needle and at the end of the pre-stroke should be caught on shoulders fixed to the housing.
  • the closing spring must be dimensioned so strong that it applies the full closing force alone in the main injection phase.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that conventional parts can be used for the holding body and the nozzle body without any modification and that the injection nozzle does not have to be extended or only insignificantly compared to a conventional design without an additional piston. Furthermore, fewer parts and dimensions are decisive for the size of the forward stroke and the total stroke of the valve needle in the embodiment according to the invention than in the case of an injection nozzle of the generic type, so that exact compliance with the prescribed stroke values poses fewer manufacturing problems than in the known embodiment.
  • the stop shoulder cooperating with the valve needle on the additional piston is particularly advantageous compared to that with the first stop fixed to the housing cooperating stop shoulder is set back by the amount of the forward stroke.
  • the upper, flat end face of the nozzle body can be finished in one operation with the flat, pinless top end face of the valve needle inserted into the nozzle body with one tool in one operation.
  • FIG. 1 shows a longitudinal section through the first exemplary embodiment
  • FIG. 2 enlarges a detail from FIG. 1
  • FIG. 3 shows a variant for the embodiment according to FIGS. 1 and 2
  • FIGS. 4 and 5 each show the second and third exemplary embodiment on the basis of a sectional diagram corresponding to FIG
  • FIG. 6 shows a variant of the third exemplary embodiment according to FIG. 5.
  • the injection nozzle according to FIGS. 1 and 2 has a nozzle body 10 which, together with an intermediate disk 12, is clamped to a holding body 16 by means of a union nut 14.
  • a valve needle 18 is slidably mounted in the nozzle body 10 and cooperates with an inward-facing valve seat in the nozzle body 10, which is arranged in front of a plurality of spray openings 20.
  • the guide bore of the valve needle 18 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 18 has a pressure shoulder and which is connected via a channel 22 and a filter body 23 to a connecting piece 24 on the holding body 16 for connecting a fuel line.
  • the fuel acting on the pressure shoulder of the valve needle 18 pushes the valve needle 18 upward against the graduated force curve of a closing force arrangement described below, the fuel being injected through the injection openings 20 in a pre-injection phase and a main injection phase.
  • a chamber 26 is formed for receiving a closing spring 28, which is supported by a washer 30 on the bottom of the chamber 26 and constantly acts on the valve needle 18 via a pressure piece 32 and a pressure bolt 34 passing through the washer 12.
  • a piston 36 is tightly but displaceably mounted in the intermediate disk 12 and has two sections 38, 40 of different diameters, between which an annular shoulder 42 is formed.
  • the correspondingly shaped bore in the intermediate disk 12 is provided with an annular shoulder 44 which delimits a second pressure chamber 46 with the annular shoulder 42 on the piston 36.
  • the piston 36 rests with its lower end face 48 on the upper end face 50 of the nozzle body 10.
  • the distance between the annular shoulders 42 and 44 corresponds to the total stroke h g reduced by a preliminary stroke h v and the distance between the end face 48 of the piston 36 and the flat, journalless end face 52 of the valve needle 18 in the closed position Forward stroke h v .
  • the pressure chamber 46 is connected to the channel 22 via a bore 54.
  • the valve needle 18 first performs the preliminary stroke h v , in which the fuel in the pressure chamber of the nozzle body 10 only has to overcome the counterforce of the closing spring 28.
  • the valve needle hits 18 on the piston 36, which stops the further movement of the valve needle 18 until the fuel pressure has risen so far that its force exerted on the valve needle in the opening direction exceeds the force of the closing spring 28 and the hydraulic closing force acting on the annular shoulder 42.
  • the valve needle 18 together with the piston 36 is moved upwards until the annular shoulders 42, 44 come into contact with one another on the piston 36 and on the intermediate disk 12.
  • the processes take place in reverse order.
  • the arrangement described has the advantage that the additional piston 36 does not require any additional space in the longitudinal direction of the injection nozzle and that the remaining stroke h g - h v of the valve needle 18 is influenced solely by the axial position tolerances of the annular shoulder 42, 44 on the piston 36 and the intermediate disk 12 becomes.
  • the valve needle 18a is designed such that in its closed position the upper end face 52a lies in the plane of the upper end face 50 of the nozzle body 10, so that both parts can be finished together by one tool.
  • the preliminary stroke play is obtained in this case in that an inner annular surface section 48a of the lower end face of the piston 36a is set back by the amount of the preliminary stroke h v compared to the remaining outer annular surface section 48b of this end face.
  • the actual dimension of the forward stroke is only influenced by tolerances on the piston 36a, which are tool-related and can therefore be kept extremely small.
  • the variant according to FIG. 3 differs from the embodiment according to FIGS. 1 and 2 in that the pressure pin 34a is integrally formed on the pressure element 32a.
  • an externally and internally smooth-cylindrical piston bushing 58 is displaceably guided in a correspondingly shaped annular cylindrical recess in the intermediate plate 56 in an intermediate plate 56.
  • a pressure chamber 62 is formed in this recess above the upper end face 60 of the piston bushing 58 and is connected to the channel 22 via a bore 64.
  • the fuel pressure in the pressure chamber 62 presses the piston bushing 58 against the upper end face 50 of the nozzle body 10, which lies above the upper end face 52 of the valve needle 18 by the amount of advance stroke h v .
  • the inner diameter of the piston bush 58 is smaller than the diameter of the valve needle 18, so that the valve needle 18 abuts the lower end face 66 of the piston bush 58 after the advance stroke h v and takes it upward according to the desired pressure level in the opening pressure curve of the fuel.
  • the total stroke h g of the valve needle 18 is limited by the inner collar 68 of the intermediate disk 56, which surrounds the pressure pin 34 and is correspondingly set back relative to the lower end face of the intermediate disk 56.
  • the injection nozzle according to FIG. 5 differs from that according to FIG. 4 essentially in that instead of the piston bushing 58, a ring of pin-like individual pistons 70 is provided, the guide bores of which open into an annular pressure chamber 72 at the top. This is formed by a corresponding recess in the upper end face of an intermediate disk 74, which is closed off by a cover plate 76 and is connected to the channel 22 via a groove 78.
  • the individual pistons 70 perform the same function as the piston bush 58 according to FIG. 4 and the total stroke h g of the valve needle 18 is also limited here by a recessed inner annular surface section 80 of the intermediate bush 74.
  • the upper end face 52a of the valve needle 18a lies in its closed position in the plane of the upper end face 50 of the nozzle body 10.
  • the individual pistons 70a with lugs 62 provided which in the lower end position of the individual pistons 70a rest on the end face 50 of the nozzle body 10 and hold the end face regions 84 of the individual pistons 70 projecting into the path of the valve needle 18a by the dimension h v above the end face 50.
  • the measure taken in the variant according to FIG. 6 could also be provided in an equivalent form for the piston bushing 58 according to FIG. 4, e.g. by turning them in at the lower end. It is thereby achieved that the upper end faces of nozzle body 10 and nozzle needle 18 can also be machined there. If only two diametrically opposed individual pistons 70 and 70a are provided, the arrangement of a cover plate 76 can be dispensed with if blind holes are provided for receiving the individual pistons 70 and 70a, which are each offset by 90 ° with respect to the channel 22 and over Single holes are connected to these.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP87102772A 1986-04-04 1987-02-26 Injecteur de combustible pour moteurs à combustion interne Expired - Lifetime EP0240693B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611316 1986-04-04
DE19863611316 DE3611316A1 (de) 1986-04-04 1986-04-04 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0240693A1 true EP0240693A1 (fr) 1987-10-14
EP0240693B1 EP0240693B1 (fr) 1990-12-27

Family

ID=6297927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102772A Expired - Lifetime EP0240693B1 (fr) 1986-04-04 1987-02-26 Injecteur de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0240693B1 (fr)
JP (1) JPS62240466A (fr)
DE (2) DE3611316A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365143A1 (fr) * 1988-10-19 1990-04-25 LUCAS INDUSTRIES public limited company Buse d'injection de combustible
WO1994003720A1 (fr) * 1992-08-05 1994-02-17 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
WO1995024552A1 (fr) * 1994-03-11 1995-09-14 Robert Bosch Gmbh Injecteur pour moteurs a combustion interne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8706757D0 (en) * 1987-03-21 1987-04-23 Lucas Ind Plc Fuel injection nozzles
JP2844742B2 (ja) * 1989-11-13 1999-01-06 日産自動車株式会社 ディーゼル機関の燃料噴射ノズル
US9605639B2 (en) 2012-07-12 2017-03-28 Ford Global Technologies, Llc Fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110102A (en) * 1963-11-26 1968-04-18 Ruston & Hornsby Ltd Improvements in fuel injection equipment for internal combustion engines
DE2704688A1 (de) * 1976-02-05 1977-08-11 Nippon Denso Co Kraftstoffeinspritzvorrichtung
DE2711902A1 (de) * 1977-03-18 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
GB2086473A (en) * 1980-10-31 1982-05-12 Daimler Benz Ag Fuel injection valve for compression ignition engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110102A (en) * 1963-11-26 1968-04-18 Ruston & Hornsby Ltd Improvements in fuel injection equipment for internal combustion engines
DE2704688A1 (de) * 1976-02-05 1977-08-11 Nippon Denso Co Kraftstoffeinspritzvorrichtung
DE2711902A1 (de) * 1977-03-18 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
GB2086473A (en) * 1980-10-31 1982-05-12 Daimler Benz Ag Fuel injection valve for compression ignition engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365143A1 (fr) * 1988-10-19 1990-04-25 LUCAS INDUSTRIES public limited company Buse d'injection de combustible
WO1994003720A1 (fr) * 1992-08-05 1994-02-17 Robert Bosch Gmbh Injecteur de carburant pour moteurs a combustion interne
US5464158A (en) * 1992-08-05 1995-11-07 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
WO1995024552A1 (fr) * 1994-03-11 1995-09-14 Robert Bosch Gmbh Injecteur pour moteurs a combustion interne

Also Published As

Publication number Publication date
DE3767001D1 (de) 1991-02-07
DE3611316A1 (de) 1987-10-08
EP0240693B1 (fr) 1990-12-27
JPS62240466A (ja) 1987-10-21

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