GB2188367A - I.c. engine fuel injection nozzle - Google Patents

I.c. engine fuel injection nozzle Download PDF

Info

Publication number
GB2188367A
GB2188367A GB08705058A GB8705058A GB2188367A GB 2188367 A GB2188367 A GB 2188367A GB 08705058 A GB08705058 A GB 08705058A GB 8705058 A GB8705058 A GB 8705058A GB 2188367 A GB2188367 A GB 2188367A
Authority
GB
United Kingdom
Prior art keywords
valve needle
pressure
closing spring
shim
pin
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
GB08705058A
Other versions
GB8705058D0 (en
GB2188367B (en
Inventor
Max Straubel
Ewald Eblen
Paul Fussner
Karl Hofmann
Werner Wagner
Klaus Wolf
Gunter Kapolke
Edgar Schneider
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 GB8705058D0 publication Critical patent/GB8705058D0/en
Publication of GB2188367A publication Critical patent/GB2188367A/en
Application granted granted Critical
Publication of GB2188367B publication Critical patent/GB2188367B/en
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
    • F02M45/083—Having two or more closing springs acting on injection-valve

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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)

Abstract

The pin 34 which continuously transmits the force of the spring 28 to the nozzle needle 18 has its end 48 which passes through the seat 46 of the spring 40 of smooth cylindrical form without enlargements. The end 50 of the needle 18 or an intermediate member (56, Figure 3) abuts the spring seat 46 after an initial needle lift. <IMAGE>

Description

SPECIFICATION Fuel injection nozzle for internal combustion engines The invention takes as its starting point a fuel injection nozzle of the kind defined in the main claim. In known injection nozzles ofthis kind, which are constructed for pre-injection and main injection, the pressure pin which continuously transmits the force of the first closing spring to the valve needle, and which passes through the second closing spring, is provided at its end facing the valve needle with a headwhich hasaflatannularshoulderwhichstrikes against the bottom end face ofthe pressure member of the second closing spring when the valve needle has completed a determined preliminary stroke.
A simpler arrangement is obtained if in accordancewith the present main claim the pressure pin transmitting the force of the first closing spring to the valve needle is in the form of a smooth cylindrical part without any thickened portion, at least at its end facing the valve needle. In this case the pressure pin can advantageously act directly on an end pin provided on the valve needle and projecting into the shim, or, via an intermediate member mounted slidably in the shim, on the flat end face ofthevalve needle. The shoulder lifting the pressure member of the second closing spring off the stop fastened on the casing, after the preliminary stroke of the valve needle, may be formed on a part made separately from the pressure pin, preferably on the end pin of the valve needle, or on the intermediate member mounted slidably in the shim.The smooth end of the pressure pin of the first closing spring, facing the valve needle, may simply be guided in the pressure member of the second closing spring if said pressure member is in turn guided, with the clearance necessary for movement, on the inside wall of the nozzle holder chamber receiving the second closing spring.
Two examples of embodiment of the invention are illustrated in the drawing and explained more fully in the description given below.
Figure lisa longitudinal section through the first embodiment, Figure2shows a part of Figure 1 on a larger scale, and Figure 3 shows the second embodiment in a section corresponding to Figure 2.
The injection nozzle shown in Figures 1 and 2 comprises a nozzle body 10, which together with a shim 12 is clamped fast on a nozzle holder 16 by means of a cap nut 14.Avalve needle 18 is mounted slidablyin the nozzle body 10 and cooperatesdwith an inwardly facing valve seat provided in the nozzle body 10 and preceding a plurality of injection openings 20. The guide bore of the valve needle 18iswidened inthe usual manner atone pointtoform a pressure chamber, in the region of which the valve needle 18 has a pressure shoulder and which is connected via a duct 22 to a connection 24 on the nozzle holder 1 6for the attachment of a fuel delivery pipe.The fuel acting on the pressure shoulder of the valve needle 18 pushes the valve needle 18 upwards againstthe stepped force flow of a closing spring arrangement, which will be described below, while the fuel is ejected through the injection openings 20 in a preinjection phase and a main injection phase.
In the nozzle holder 16 a first chamber 26 isformed to receive a first closing spring 28, which is supported by way of a washer 30 on the bottom ofthe chamber 26 and acts continuously on the valve needle 18 byway of a pressure member 32 and a pressure pin 34. The chamber 26 merges as a casing shoulder36 into a second chamber 38, in which is disposed a second closing spring 40, which surrounds the pressure pin 34. The closing spring 40 is supported by way of washers 42, 44 on the casing shoulder36and bywayofapressure member46 againstthetop end face ofthe shim 12.
The pressure member 46 is guided slidably on the wall of the chamber 38 with the clearance necessary for movement. That end 48 of the pressure pin 34 which faces the valve needle 18 is smooth and is guided for sliding in the pressure member 46. The valve needle 18 is provided with an end pin 50 projecting into the shim 12 and acted on directly by the pressure pin 34. The end pin 50 is of such dimensions that in the closed position of the valve needle 18 it lies at a distance corresponding to the preliminary stroke hv below the top end face ofthe shim 12. On completion of the preliminary stroke hv, the end pin 50 strikes against the pressure member 46, whereupon both closing springs 28,40 act on the valve needle 18 in the closing direction.The total stroke hg of the valve needle is in the known manner limited by the annular shoulder 52 formed on thevalve needle 18 atthe transition to the end pin 50 and by the bottom end face ofthe shim 12.
In the injection nozzle shown in Figure 3, the smooth bottom end 48 ofthe pressure pin 34 acts by way of an intermediate member 56 mounted slidably in the shim 54 on a valve needle 58, which atthetop ends in a flat endface. The preliminary stroke hv is limited in this embodiment by the intermediate member 56, which is provided at its end face facing the pressure member 46 with an annularcollar60 enlarging the contact area.
1. Fuel injection nozzlefor internal combustion engines, comprising a nozzle body in which a valve needle is slidably mounted and which is clamped fast via a shim on a nozzle holder in which a chamber is formed for receiving two closing springs which are disposed axially one behind the other and ofwhich the first acts continuously on the valve needle via a central pressure pin, while the second closing spring acts on a pressure member which in the closed position of the valve needle is supported on afirstshoul- derformed on the shim and against which the valve needle or a part moving with it comes to bear on completion of a preliminary stroke, and further com prising a second shoulderwhich is provided on the shim and which in cooperation with a coacting shoulder, which at the latest moves with the valve needle after completion of the preliminary stroke, limits the total stroke ofthe valve needle, characterized in that the pressure pin (34) which con
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Fuel injection nozzle for internal combustion engines The invention takes as its starting point a fuel injection nozzle of the kind defined in the main claim. In known injection nozzles ofthis kind, which are constructed for pre-injection and main injection, the pressure pin which continuously transmits the force of the first closing spring to the valve needle, and which passes through the second closing spring, is provided at its end facing the valve needle with a headwhich hasaflatannularshoulderwhichstrikes against the bottom end face ofthe pressure member of the second closing spring when the valve needle has completed a determined preliminary stroke. A simpler arrangement is obtained if in accordancewith the present main claim the pressure pin transmitting the force of the first closing spring to the valve needle is in the form of a smooth cylindrical part without any thickened portion, at least at its end facing the valve needle. In this case the pressure pin can advantageously act directly on an end pin provided on the valve needle and projecting into the shim, or, via an intermediate member mounted slidably in the shim, on the flat end face ofthevalve needle. The shoulder lifting the pressure member of the second closing spring off the stop fastened on the casing, after the preliminary stroke of the valve needle, may be formed on a part made separately from the pressure pin, preferably on the end pin of the valve needle, or on the intermediate member mounted slidably in the shim.The smooth end of the pressure pin of the first closing spring, facing the valve needle, may simply be guided in the pressure member of the second closing spring if said pressure member is in turn guided, with the clearance necessary for movement, on the inside wall of the nozzle holder chamber receiving the second closing spring. Two examples of embodiment of the invention are illustrated in the drawing and explained more fully in the description given below. Figure lisa longitudinal section through the first embodiment, Figure2shows a part of Figure 1 on a larger scale, and Figure 3 shows the second embodiment in a section corresponding to Figure 2. The injection nozzle shown in Figures 1 and 2 comprises a nozzle body 10, which together with a shim 12 is clamped fast on a nozzle holder 16 by means of a cap nut 14.Avalve needle 18 is mounted slidablyin the nozzle body 10 and cooperatesdwith an inwardly facing valve seat provided in the nozzle body 10 and preceding a plurality of injection openings 20. The guide bore of the valve needle 18iswidened inthe usual manner atone pointtoform a pressure chamber, in the region of which the valve needle 18 has a pressure shoulder and which is connected via a duct 22 to a connection 24 on the nozzle holder 1 6for the attachment of a fuel delivery pipe.The fuel acting on the pressure shoulder of the valve needle 18 pushes the valve needle 18 upwards againstthe stepped force flow of a closing spring arrangement, which will be described below, while the fuel is ejected through the injection openings 20 in a preinjection phase and a main injection phase. In the nozzle holder 16 a first chamber 26 isformed to receive a first closing spring 28, which is supported by way of a washer 30 on the bottom ofthe chamber 26 and acts continuously on the valve needle 18 byway of a pressure member 32 and a pressure pin 34. The chamber 26 merges as a casing shoulder36 into a second chamber 38, in which is disposed a second closing spring 40, which surrounds the pressure pin 34. The closing spring 40 is supported by way of washers 42, 44 on the casing shoulder36and bywayofapressure member46 againstthetop end face ofthe shim 12. The pressure member 46 is guided slidably on the wall of the chamber 38 with the clearance necessary for movement. That end 48 of the pressure pin 34 which faces the valve needle 18 is smooth and is guided for sliding in the pressure member 46. The valve needle 18 is provided with an end pin 50 projecting into the shim 12 and acted on directly by the pressure pin 34. The end pin 50 is of such dimensions that in the closed position of the valve needle 18 it lies at a distance corresponding to the preliminary stroke hv below the top end face ofthe shim 12. On completion of the preliminary stroke hv, the end pin 50 strikes against the pressure member 46, whereupon both closing springs 28,40 act on the valve needle 18 in the closing direction.The total stroke hg of the valve needle is in the known manner limited by the annular shoulder 52 formed on thevalve needle 18 atthe transition to the end pin 50 and by the bottom end face ofthe shim 12. In the injection nozzle shown in Figure 3, the smooth bottom end 48 ofthe pressure pin 34 acts by way of an intermediate member 56 mounted slidably in the shim 54 on a valve needle 58, which atthetop ends in a flat endface. The preliminary stroke hv is limited in this embodiment by the intermediate member 56, which is provided at its end face facing the pressure member 46 with an annularcollar60 enlarging the contact area. CLAIMS
1. Fuel injection nozzlefor internal combustion engines, comprising a nozzle body in which a valve needle is slidably mounted and which is clamped fast via a shim on a nozzle holder in which a chamber is formed for receiving two closing springs which are disposed axially one behind the other and ofwhich the first acts continuously on the valve needle via a central pressure pin, while the second closing spring acts on a pressure member which in the closed position of the valve needle is supported on afirstshoul- derformed on the shim and against which the valve needle or a part moving with it comes to bear on completion of a preliminary stroke, and further com prising a second shoulderwhich is provided on the shim and which in cooperation with a coacting shoulder, which at the latest moves with the valve needle after completion of the preliminary stroke, limits the total stroke ofthe valve needle, characterized in that the pressure pin (34) which con tinuouslytransmitstheforceofthefirstclosing spring (28) to the valve needle (18,58), and which passes through the second closing spring (40), is formed as a smooth cylindrical part, without a head-likethickening, at least at its end (48) facing the valve needle (18,58).
2. Injection nozzle according to Claim 1, characterized in thatthe pressure pin (34) is guided at its smooth end (48), facing the valve needle (18,58), in the pressure member (46) ofthe second closing spring (40), said pressure member being in turn guided, with the clearance required for movement, on the wall ofthe chamber (38) provided in the nozzle hol- der (16) and receiving the second closing spring (40).
3. Injection nozzleaccording to Claim 1 or 2, char- acterized in that the pressure pin (34) acts directly on an end pin (50) provided on the valve needle (18)and projecting into the shim (12).
4. Injection nozzle according to Claim 1 or 2, characterized in that the pressure pin (34) acts on the flat end face of the valve needle (58) via an intermediate member (56) mounted slidably in the shim (54).
5. Injection nozzle according to one of the pre- ceding claims, characterized in that after completion ofthe preliminary stroke (hv) ofthevalve needle (18, 58) a part(18,56) separate from the pressure pin (34) comes to bear againstthe pressure member(46) of the second closing spring (40).
6. Injection nozzle according to Claims 3 and 5, characterized in that after completion of the preliminary stroke (hv) of the valve needle (18) its end pin (50) comes to bear against the pressure member (46) ofthe second closing spring (40).
7. Injection nozzle according to Claims 4 and 5, characterized in that after completion ofthe pre liminary stroke (hv) of the valve needle (18) the inter- mediate member (56) slidably mounted in the shim (54) comes to bearagainstthe pressure member (46) ofthe second closing spring (40).
8. Afuel injection nozzle substantially as herein described with reference to Figures 1 and 2, or Figure 3, ofthe accompanying drawings.
GB8705058A 1986-03-29 1987-03-04 Fuel injection nozzle for an internal combustion engine Expired GB2188367B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19868608650 DE8608650U1 (en) 1986-03-29 1986-03-29 Fuel injection nozzle for internal combustion engines

Publications (3)

Publication Number Publication Date
GB8705058D0 GB8705058D0 (en) 1987-04-08
GB2188367A true GB2188367A (en) 1987-09-30
GB2188367B GB2188367B (en) 1989-11-15

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ID=6793186

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8705058A Expired GB2188367B (en) 1986-03-29 1987-03-04 Fuel injection nozzle for an internal combustion engine

Country Status (3)

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JP (1) JP2525401B2 (en)
DE (1) DE8608650U1 (en)
GB (1) GB2188367B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848668A (en) * 1987-05-12 1989-07-18 Lucas Industries Public Limited Company Fuel injection nozzles
US4938193A (en) * 1987-06-15 1990-07-03 Stanadyne Automotive Corp. Fuel injection nozzle
GB2230561A (en) * 1989-04-21 1990-10-24 Daimler Benz Ag I.c engine fuel injection pumping system
GB2232202A (en) * 1989-06-02 1990-12-05 Lucas Ind Plc C.i. engine fuel injector
EP0400886A1 (en) * 1989-06-02 1990-12-05 LUCAS INDUSTRIES public limited company Fuel injection nozzle
EP0459676A1 (en) * 1990-06-01 1991-12-04 Lucas Industries Public Limited Company Fuel injection nozzle
GB2251891A (en) * 1991-01-17 1992-07-22 Bosch Gmbh Robert Fuel-injection nozzle for internal-combustion engines
GB2226362B (en) * 1988-12-22 1993-04-28 Bosch Gmbh Robert Fuel injection nozzle for internal-combustion engines

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH081160B2 (en) * 1988-09-19 1996-01-10 株式会社ゼクセル Fuel injection valve
DE3907569A1 (en) * 1989-03-09 1990-09-13 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE4440182C2 (en) * 1994-11-10 2003-09-18 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19835340A1 (en) * 1997-11-03 2000-02-10 Guenter Slowik Method and injection nozzle for injecting fuel into the combustion chamber of an internal combustion engine
DE19748384A1 (en) * 1997-11-03 1999-05-06 Guenter Dr Ing Slowik Fuel injection process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2003549A (en) * 1977-09-01 1979-03-14 Sulzer Ag I.c. engine fuel injector
GB1575269A (en) * 1977-03-16 1980-09-17 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142470U (en) * 1983-03-16 1984-09-22 三菱自動車工業株式会社 fuel injection valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1575269A (en) * 1977-03-16 1980-09-17 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
GB2003549A (en) * 1977-09-01 1979-03-14 Sulzer Ag I.c. engine fuel injector

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848668A (en) * 1987-05-12 1989-07-18 Lucas Industries Public Limited Company Fuel injection nozzles
US4938193A (en) * 1987-06-15 1990-07-03 Stanadyne Automotive Corp. Fuel injection nozzle
GB2226362B (en) * 1988-12-22 1993-04-28 Bosch Gmbh Robert Fuel injection nozzle for internal-combustion engines
GB2230561A (en) * 1989-04-21 1990-10-24 Daimler Benz Ag I.c engine fuel injection pumping system
GB2230561B (en) * 1989-04-21 1993-08-25 Daimler Benz Ag Fuel-injection apparatus for an internal-combustion engine
GB2232202A (en) * 1989-06-02 1990-12-05 Lucas Ind Plc C.i. engine fuel injector
EP0400886A1 (en) * 1989-06-02 1990-12-05 LUCAS INDUSTRIES public limited company Fuel injection nozzle
EP0459676A1 (en) * 1990-06-01 1991-12-04 Lucas Industries Public Limited Company Fuel injection nozzle
US5165607A (en) * 1990-06-01 1992-11-24 Lucas Industries Public Limited Co. Fuel injection nozzle
GB2251891A (en) * 1991-01-17 1992-07-22 Bosch Gmbh Robert Fuel-injection nozzle for internal-combustion engines
GB2251891B (en) * 1991-01-17 1994-10-19 Bosch Gmbh Robert Fuel-injection nozzle for internal-combustion engines

Also Published As

Publication number Publication date
JP2525401B2 (en) 1996-08-21
DE8608650U1 (en) 1987-07-23
JPS62237076A (en) 1987-10-17
GB8705058D0 (en) 1987-04-08
GB2188367B (en) 1989-11-15

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20070303