US3764076A - Fuel injection nozzle unit for internal combustion engines - Google Patents

Fuel injection nozzle unit for internal combustion engines Download PDF

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Publication number
US3764076A
US3764076A US00231114A US3764076DA US3764076A US 3764076 A US3764076 A US 3764076A US 00231114 A US00231114 A US 00231114A US 3764076D A US3764076D A US 3764076DA US 3764076 A US3764076 A US 3764076A
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US
United States
Prior art keywords
valve needle
spring
valve
nozzle unit
cam member
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.)
Expired - Lifetime
Application number
US00231114A
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English (en)
Inventor
E Eblen
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
Application granted granted Critical
Publication of US3764076A publication Critical patent/US3764076A/en
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
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • 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
    • F02M2200/44—Valves, e.g. injectors, with valve bodies arranged side-by-side
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • This invention relates to a fuel injection nozzle unit for internal combustion engines and is of the type that comprises two valve needles disposed in a single nozzle body and limited in their motion by abutments. With each valve needle there is associated a separate, independent pressure chamber supplied with fuel through a common feed conduit.
  • the fuel is injected against the wall of the spherical combustion chamber. If the engine is hot, there occurs a partial vaporization of the fuel, but if the engine is cold and particularly when, in addition, it idles, the wall temperature is insufficient to bring about a vaporization and, accordingly, a complete combustion of the fuel. The result is an increased concentration of uncombusted poisonous components in the exhaust gas (blue smoke).
  • the invention seeks to develop a fuel injection nozzle which may find particularly advantageous use in engines operating according to the Meurer process and with which the fuel during warm-up run of the engine is not directed against the cold cylinder wall, but rather, it is injected towards the center of the spherical combustion chamber in which a-favorable fuel-air mixture buildup is effected by virtue of the prevailing air swirl. It is a desideratum, however, that the nozzle should also be adapted for use in engines in which, because of the large differences in the injected fuel quantities for the different operational conditions (turbo charged engines), a conventional nozzle does not provide for an optimal jet preparation.
  • a non-projecting pin which has a groove that extends at an inclined angle with respect to the axis of the nozzle bore.
  • the groove serves as an injection opening of constant cross section.
  • the valve needle is rotatable together with the aforenoted inclined groove and thus the direction of injection may be changed.
  • Such a structure is relatively complex and there is a danger of charring between the pin and the nozzle bore. Further, because of the constant flow passage section of the groove, an optimal matching with the combustion requirements is not possible.
  • another known fuel injection nozzle such as disclosed in German Pat. No.
  • the aforenoted abutments which limit the stroke of the valve needles are adjustable interdependently of one another in such a manner that during operation one or the other valve needle may be blocked in its closed position.
  • the adjustment of the abutments may be effected by hydraulic, electric, pneumatic or any other means and may be performed simultaneously for all nozzles in the engine. In this manner not only a load-dependent but also a temperature-dependent change in the direction of injection may be achieved.
  • a nozzle body 1 is clamped to a nozzle holder 3 by means of a sleeve nut 2.
  • the nozzle body 1 there are disposed two valve needles 4, the associated pressure" chambers 5 of which are supplied with fuel by a common feed channel 6.
  • an intermediate disc 7 which determines the maximum possible stroke of the valve needles 4.
  • the latter are biased by closing springs 8 with the interposition of spring seat discs 9.
  • the spring characteristics and the opening pressures may be different in one and the same nozzle unit if required by operational conditions.
  • each spring 8 engages spring seat discs 10 which in the direction of the associated valve needle 4 have pin-like extensions 11 determining the maximum spring compression.
  • a washer 12 which, dependent upon its thickness, determines the spring bias and thus the opening pressure.
  • Each spring seat disc 10 is axially displaceable by a separate rod 13 which, at its other end, engages a sole cam disc 14 which, in turn, is rotatable by means of a shaft 15 and a lever 16.
  • the cam face 17 of the disc 14 is designed in such a manner that in one or the other extreme position of the cam disc 4, one or the other valve needle 4 is lockingly pressed against its valve seat and thus the admitted.
  • the nozzle unit is mounted in such a manner in the combustion chamber that one nozzle opening, for example, that designated with 20a, is oriented towards the chamber wall, while the other nozzle opening, designated with 20b, is directed towards the center of the needle 4 associated with the nozzle opening a is now rigidly locked; further, above a certain predetermined chamber wall temperature, the lever 16 will be in another extreme position in which fuel injection may take place only through the nozzle opening 20a oriented towards the chamber wall, since now it is the valve needle 4 associated with the nozzle opening 20b which is rigidly locked.
  • rigid lock there is meant the exertion of such a total closing force by springs 18 and 8 on one or the other valve needle that the valve lifting force of the fuel pressure in the associated pressure chamber 5 is not capable of causing an upward movement (opening) of the valve needle.
  • a fuel injection nozzle unit of the known type that has (a) a nozzle body, (b) two valve needles reciprocably disposed in said nozzle body, (c) a valve seat associated with each valve needle, (d) resilient means associated with each valve needle to urge the latter against its valve seat, (e) an abutment means associated with each valve needle for determining the limit of the stroke thereof, (f) a separate pressure chamber associated with each valve needle and (g) a common feed conduit means for supplying fuel to said pressure chambers, the improvement comprising means for interdependently adjusting said abutments externally of said nozzle unit for affecting the stroke of each valve needie.
  • said abutment means includes a cam disc rotatably disposed in said nozzle unit, said cam disc having a cam face oriented towards said valve needles and cooperating therewith for affecting the length of their stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US00231114A 1971-04-29 1972-03-02 Fuel injection nozzle unit for internal combustion engines Expired - Lifetime US3764076A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2121121A DE2121121C3 (de) 1971-04-29 1971-04-29 Kraftstoffeinspritzdüse für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3764076A true US3764076A (en) 1973-10-09

Family

ID=5806373

Family Applications (1)

Application Number Title Priority Date Filing Date
US00231114A Expired - Lifetime US3764076A (en) 1971-04-29 1972-03-02 Fuel injection nozzle unit for internal combustion engines

Country Status (6)

Country Link
US (1) US3764076A (de)
AT (1) AT312372B (de)
DE (1) DE2121121C3 (de)
FR (1) FR2136720A5 (de)
GB (1) GB1389299A (de)
IT (1) IT953848B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066213A (en) * 1976-04-16 1978-01-03 Deere & Company Fuel injection nozzle assembly
DE3407545A1 (de) * 1984-03-01 1985-09-05 Hubert 8500 Nürnberg Keiczek Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP1079094A3 (de) * 1999-08-26 2001-08-16 Delphi Technologies, Inc. Kraftstoffeinspritzventil
US7556017B2 (en) * 2006-03-31 2009-07-07 Caterpillar Inc. Twin needle valve dual mode injector
US20100269783A1 (en) * 2005-03-09 2010-10-28 Carl-Anders Hergart Internal combustion engine and operating method therefor
US20140091159A1 (en) * 2012-09-28 2014-04-03 Caterpillar Inc. Dual fuel injector with off set check biasing springs
US20140346254A1 (en) * 2014-08-07 2014-11-27 Caterpillar Inc. Fuel injector for gaseous injection
US20150047614A1 (en) * 2013-08-19 2015-02-19 Caterpillar, Inc. Dual fuel system for internal combustion engine and leakage limiting seal strategy for same
CN107100773A (zh) * 2017-05-04 2017-08-29 芜湖市海联机械设备有限公司 一种喷油器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711391A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE2943896A1 (de) * 1979-10-31 1981-05-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE2944339A1 (de) * 1979-11-02 1981-05-14 Volkswagenwerk Ag, 3180 Wolfsburg Fremdgezuendete brennkraftmaschine
WO2019145592A1 (en) * 2018-01-23 2019-08-01 Wärtsilä Finland Oy Fuel injection arrangement and method of operating piston engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2002134A (en) * 1931-12-09 1935-05-21 Baj Alessandro Fuel spray injection for internal combustion engines
GB549419A (en) * 1941-04-18 1942-11-20 Nat Gas And Oil Engine Company Improvements in or relating to injection nozzles for internal-combustion engines
FR1209212A (fr) * 1958-06-27 1960-02-29 Perfectionnements apportés aux injecteurs de liquide sous pression, notamment aux injecteurs de combustible

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2002134A (en) * 1931-12-09 1935-05-21 Baj Alessandro Fuel spray injection for internal combustion engines
GB549419A (en) * 1941-04-18 1942-11-20 Nat Gas And Oil Engine Company Improvements in or relating to injection nozzles for internal-combustion engines
FR1209212A (fr) * 1958-06-27 1960-02-29 Perfectionnements apportés aux injecteurs de liquide sous pression, notamment aux injecteurs de combustible

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066213A (en) * 1976-04-16 1978-01-03 Deere & Company Fuel injection nozzle assembly
DE3407545A1 (de) * 1984-03-01 1985-09-05 Hubert 8500 Nürnberg Keiczek Kraftstoff-einspritzduese fuer brennkraftmaschinen
EP1079094A3 (de) * 1999-08-26 2001-08-16 Delphi Technologies, Inc. Kraftstoffeinspritzventil
US6422199B1 (en) 1999-08-26 2002-07-23 Delphi Technologies, Inc. Fuel injector
US8069835B2 (en) * 2005-03-09 2011-12-06 Caterpillar Inc. Internal combustion engine and operating method therefor
US20100269783A1 (en) * 2005-03-09 2010-10-28 Carl-Anders Hergart Internal combustion engine and operating method therefor
US7556017B2 (en) * 2006-03-31 2009-07-07 Caterpillar Inc. Twin needle valve dual mode injector
US20140091159A1 (en) * 2012-09-28 2014-04-03 Caterpillar Inc. Dual fuel injector with off set check biasing springs
US9046067B2 (en) * 2012-09-28 2015-06-02 Caterpillar Inc. Dual fuel injector with off set check biasing springs
US20150047614A1 (en) * 2013-08-19 2015-02-19 Caterpillar, Inc. Dual fuel system for internal combustion engine and leakage limiting seal strategy for same
CN104421080A (zh) * 2013-08-19 2015-03-18 卡特彼勒公司 用于内燃发动机的双燃料系统及其限制泄漏密封策略
US9175651B2 (en) * 2013-08-19 2015-11-03 Caterpillar Inc. Dual fuel system for internal combustion engine and leakage limiting seal strategy for same
CN104421080B (zh) * 2013-08-19 2018-05-04 卡特彼勒公司 用于内燃发动机的双燃料系统及其限制泄漏密封策略
US20140346254A1 (en) * 2014-08-07 2014-11-27 Caterpillar Inc. Fuel injector for gaseous injection
CN107100773A (zh) * 2017-05-04 2017-08-29 芜湖市海联机械设备有限公司 一种喷油器

Also Published As

Publication number Publication date
FR2136720A5 (de) 1972-12-22
DE2121121B2 (de) 1978-06-01
DE2121121C3 (de) 1979-01-25
IT953848B (it) 1973-08-10
GB1389299A (en) 1975-04-03
DE2121121A1 (de) 1972-11-09
AT312372B (de) 1973-12-27

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