GB2349421A - I.c. engine register type fuel injector with two injection stages - Google Patents

I.c. engine register type fuel injector with two injection stages Download PDF

Info

Publication number
GB2349421A
GB2349421A GB0010159A GB0010159A GB2349421A GB 2349421 A GB2349421 A GB 2349421A GB 0010159 A GB0010159 A GB 0010159A GB 0010159 A GB0010159 A GB 0010159A GB 2349421 A GB2349421 A GB 2349421A
Authority
GB
United Kingdom
Prior art keywords
nozzle
sleeve
nozzle needle
register
nozzle body
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
GB0010159A
Other versions
GB0010159D0 (en
GB2349421B (en
Inventor
Jaroslaw Hlousek
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 GB0010159D0 publication Critical patent/GB0010159D0/en
Publication of GB2349421A publication Critical patent/GB2349421A/en
Application granted granted Critical
Publication of GB2349421B publication Critical patent/GB2349421B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • 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
    • F02M61/161—Means for adjusting injection-valve lift

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

A register nozzle having two through-flow cross-sections (14, 15) for the purpose of injecting fuel, in particular heavy oil, in two stages from a pressure chamber (8) into the combustion chamber of an internal combustion engine, having a nozzle holder (27) and a nozzle body (6) in which a nozzle needle (1) which is pretensioned by virtue of a spring (5) can be displaced in an axial manner by means of a nozzle needle stroke stop device (4). A sleeve (3) is received in an axially displaceable manner on the nozzle needle (1) in the nozzle body (6) and, when acted upon by pressure, is moved against a sleeve stop (12), which is formed on the nozzle body (6), the nozzle needle stroke stop device (4) moving into position against said sleeve in the first injection stage, and a stop (16) being formed on the nozzle body (6), the nozzle needle stroke stop device moving into position against said stop in the second injection stage. A cooling jacket 24 may be provided.

Description

2349421
DESCRIPTION REGISTER NOZZLE
The invention relates to register nozzles of the type having two throughflow cross-sections for the purpose of injecting fuel, in particular heavy oil, in two stages from a pressure chamber into the combustion chamber of an internal combustion engine, having a nozzle holder and a nozzle body in which a nozzle needle which is pretensioned by virtue of a spring can be displaced in an axial manner by means of a nozzle needle stroke stop device.
One through-flow cross-section in the form of a first gallery of injection holes can be designed, for example, for the no-load operation and one through-flow crosssection in the form of a second gallery of injection holes can be designed for the fullload operation. It is possible to control the opening of the second through-flow crosssection with a nozzle needle stroke stop by virtue of the resilient characteristic of the spring. Alternatively, the opening of the second through-flow cross-section could be controlled with two nozzle needle stroke stops by virtue of two springs. However, within the scope of the present invention both designs have demonstrated fundamental disadvantages with respect to the opening tolerances of the second stage and with respect to the opening pressure ratio between the individual opening stages.
It is an object of the present invention to provide a register nozzle of the type described in the introduction which is constructed in a convenient manner and can be produced in a cost-effective manner. The register nozzle in accordance with the invention is to have an opening pressure ratio greater than two between the second
2 stage and the first stage.
In accordance with the present invention, there is provided a register nozzle having two through-flow cross-sections for the purpose of injecting fuel, in particular heavy oil, in two stages from a pressure chamber into the combustion chamber of an internal combustion engine, having a nozzle holder and a nozzle body in which a nozzle needle which is pretensioned by virtue of a spring can be displaced in an axial manner by means of a nozzle needle stroke stop device, wherein a sleeve is received in an axially displaceable manner on the nozzle needle in the nozzle body, the sleeve being moved, when acted upon by pressure, against a sleeve stop formed on the nozzle body, the nozzle needle stroke stop device moves into position against said sleeve in the first injection stage, and the nozzle body is provided with a stop, against which the nozzle needle stroke stop device moves into position in the second injection stage.
As a consequence, the register nozzle is opened in two stages with only one normal spring and two nozzle needle stroke stops. The hydraulic control of the through-flow cross-sections of the register nozzle and the opening pressure is fixed by virtue of the design of the different diameters of the nozzle needle and the sleeve. Despite its compact design, the additional sleeve renders it possible to achieve a greater ratio of the opening pressures with only one spring. Even in the case of high rotational speeds, a step-wise opening of the register nozzle is guaranteed.
One particular embodiment of the invention is characterised in that the nozzle needle comprises a hollow chamber which is connected by way of a plurality of 3 transverse bores to the pressure chamber. As a consequence, the fuel is collected and distributed in a uniform manner upstream of the injection holes.
Another particular embodiment of the invention is characterised in that the stroke stop device is formed by a flange sleeve which is provided with an outer thread which serves to receive a nut which serves to hold a spring plate on the flange sleeve. By turning the nut, it is possible to vary the pretensioning of the spring in a convenient manner.
Another particular embodiment of the invention is characterised in that the nozzle body is surrounded at least partially by a cooling jacket. The cooling process ensures that the register nozzle in accordance with the invention is also suitable for operation using heavy oil.
The invention is described further hereinafter, by way of example only, with reference to the accompanying drawing which is a longitudinal sectional view of a register nozzle in accordance with the invention.
The features mentioned in the claims and in the description can embody the invention individually in their own right or in any combination.
The register nozzle illustrated in the drawing comprises a nozzle needle 1, on the end of which is formed a conical seat 2. Moreover, the end of the nozzle needle I is provided with a plurality of injection holes in two injection hole galleries 14 and 15 which are spaced apart from each other in an axial manner. The nozzle needle I is received in an axially displaceable manner in a nozzle body 6. The nozzle body 6 is attached to a nozzle holder 27 with the aid of a union nut 28.
4 Inside the nozzle holder 27, a spring 5 is located in a spring chamber 29. The spring 5 is clamped between the end face of the nozzle body, remote from the injection holes, and a spring plate 22. The spring plate 22 is held on a flange sleeve 4. For this purpose, the flange sleeve 4 is provided with an outer thread 21. The flange sleeve 4 is shrunk on to the nozzle needle I and is attached to the nozzle needle 1 by laser-welding.
Inside the nozzle needle 1, a blind hole 19 is recessed and the injection holes 14, 15 issue therefrom. The blind hole is connected by way of transverse bores 20 to a pressure chamber 8 which surrounds the nozzle needle 1 in an annular manner. A fuel supply line 7 issues into the pressure chamber 8.
Above the transverse bores 20 a step 30 is formed on the nozzle needle 1. The step 30 forms a stop for one sleeve 3 which is guided in an axially displaceable manner between the outer periphery of the nozzle needle 1 and the inner periphery of the nozzle body 6. On the outer peripheral surface of the sleeve 3 there is formed a step 12 which lies against an edge of the nozzle body 6. The end face 13 of the sleeve 3 protrudes out of the nozzle body 6.
The injection holes 14 and 15 in the nozzle needle I remain closed when there is no pressure loading. The needle I is guided in the nozzle body 6 at diameter 9 and 10. The sleeve 3 is guided on the outside on a diameter 11.
When the nozzle is pressure-loaded by way of the supply line 7 into the pressure chamber 8, the nozzle needle 1 is influenced by pressure at the diameters 9, 10 and 11. As a consequence, the sleeve is moved as far as the stop 12.
The diameter 9 of the nozzle needle 1 is greater than the diameter 10 of the nozzle needle 1. If the sum of the forces acting upon the nozzle needle I is greater than the force of the spring 5, the nozzle needle I moves as far as the end face 13 of the sleeve 3 which forms a stroke stop. In so doing, the first injection hole gallery 14 is opened and the injection procedure commences.
The second injection hole gallery 15 is only opened if the sum of the forces at the diameter 9 of the nozzle needle 1 and the diameter I I of the sleeve 3 is greater than the force of the spring 5. In so doing, the diameter 9 of the nozzle needle I is greater than the diameter 11 of the sleeve 3. The second gallery of injection holes 15 can only be opened if the pressure is considerably greater than when the first injection hole gallery 14 is opened. The opening pressure of the second stage depends upon the difference in the diameters 11 and 10. When the second injection hole gallery 15 is opened, the nozzle needle I is moved as far as the stop 16 formed on the nozzle body 6. When the nozzle needle I is relieved of pressure at the termination of the injection procedure, the nozzle needle I moves as a unit together with the sleeve 3. The unit consisting of the nozzle needle I and the sleeve 3 moves as far as the stop 12 which is formed on the nozzle body 6. In so doing, the injection hole gallery 15 is closed. The nozzle needle I then moves further as far as the seat 2, which results in the injection hole gallery 14 being closed. The stop of the sleeve 3 is hydraulically damped.
The hollow chamber 19 of the nozzle needle I is sealed by virtue of a bolt 18 which has been shrunk in. The hollow chamber 19 is connected to the pressure 6 chamber 8 by virtue of the transverse bores 20 and establishes a connection to the injection holes 14, 15.
The opening pressure of the register nozzle is adjusted by the prietensioning of the spring 5. The spring pretensioning is altered by varying the axial position of the spring plate 22. The position of the spring plate 22 is secured by means of the nut 23.
The nozzle body 6 can be cooled in particular in the region of the guide 9 and the seat 2 according to requirement. The cooling jacket 24 can be attached to the nozzle body 6 for example with the aid of a solder connection.
The register nozzle is attached as a unit together with the spring 5 to the nozzle holder 27 with the aid of the union nut 28. Leakages from the nozzle are carried off from the spring chamber 29 through the bore 3 1.

Claims (5)

7 CLAIMS
1. A register nozzle having two through-flow cross-sections for the purpose of injecting fuel, in particular heavy oil, in two stages from a pressure chamber into the combustion chamber of an internal combustion engine, having a nozzle holder and a nozzle body in which a nozzle needle which is pretensioned by virtue of a spring can be displaced in an axial manner by means of a nozzle needle stroke stop device, wherein a sleeve is received in an axially displaceable manner on the nozzle needle in the nozzle body, the sleeve being moved, when acted upon by pressure, against a sleeve stop formed on the nozzle body, the nozzle needle stroke stop device moves into position against said sleeve in the first injection stage, and the nozzle body is provided with a stop, against which the nozzle needle stroke stop device moves into position in the second injection stage.
2. A register nozzle as claimed in claim 1, wherein a hollow chamber is provided in the nozzle needle and is connected by way of a plurality of transverse bores to the pressure chamber.
3. A register nozzle according to claim I or 2, wherein the stroke stop device is formed by a flange sleeve which is provided with an outer thread which receives a nut which serves to hold a spring plate on the flange sleeve.
4. A register nozzle according to any of the preceding claims, wherein the nozzle body is surrounded at least partially by a cooling jacket.
5. A register nozzle substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
GB0010159A 1999-04-29 2000-04-27 Register nozzle Expired - Fee Related GB2349421B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999119431 DE19919431B4 (en) 1999-04-29 1999-04-29 Registerdüse

Publications (3)

Publication Number Publication Date
GB0010159D0 GB0010159D0 (en) 2000-06-14
GB2349421A true GB2349421A (en) 2000-11-01
GB2349421B GB2349421B (en) 2001-07-04

Family

ID=7906226

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0010159A Expired - Fee Related GB2349421B (en) 1999-04-29 2000-04-27 Register nozzle

Country Status (3)

Country Link
DE (1) DE19919431B4 (en)
FR (1) FR2792972A1 (en)
GB (1) GB2349421B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1734251A1 (en) * 2005-06-17 2006-12-20 MAGNETI MARELLI POWERTRAIN S.p.A. Fuel injector
WO2007126529A1 (en) * 2006-03-31 2007-11-08 Caterpillar Inc. Nozzle assembly
US7546961B2 (en) 2005-04-29 2009-06-16 Magneti Marelli Powertrain S.P.A. Fuel injector with electromagnetic actuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0000863D0 (en) * 2000-01-15 2000-03-08 Delphi Diesel Systems Ltd Fuel injector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872614A (en) * 1987-02-06 1989-10-10 Lucas Industries Public Limited Company Fuel injection nozzle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2127460C3 (en) * 1971-06-03 1973-11-22 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Rotationally symmetrical fuel injector
DE3105686A1 (en) * 1981-02-17 1982-09-02 Robert Bosch Gmbh, 7000 Stuttgart "FUEL INJECTION NOZZLE"
IT1150819B (en) * 1981-04-14 1986-12-17 Lucas Ind Plc FUEL INJECTION NOZZLES
DE4444363A1 (en) * 1994-12-14 1996-06-20 Bosch Gmbh Robert Multi-jet fuel injector
JPH08277765A (en) * 1995-04-05 1996-10-22 Zexel Corp Fuel injection nozzle
DE19543994A1 (en) * 1995-11-25 1997-05-28 Bosch Gmbh Robert Fuel injection valve for internal combustion engines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872614A (en) * 1987-02-06 1989-10-10 Lucas Industries Public Limited Company Fuel injection nozzle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7546961B2 (en) 2005-04-29 2009-06-16 Magneti Marelli Powertrain S.P.A. Fuel injector with electromagnetic actuator
EP1734251A1 (en) * 2005-06-17 2006-12-20 MAGNETI MARELLI POWERTRAIN S.p.A. Fuel injector
US7204434B2 (en) 2005-06-17 2007-04-17 Magneti Marelli Powertrain S.P.A. Fuel injector
WO2007126529A1 (en) * 2006-03-31 2007-11-08 Caterpillar Inc. Nozzle assembly

Also Published As

Publication number Publication date
FR2792972A1 (en) 2000-11-03
GB0010159D0 (en) 2000-06-14
GB2349421B (en) 2001-07-04
DE19919431A1 (en) 2000-11-02
DE19919431B4 (en) 2008-10-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050427