US3817456A - Fuel injection nozzle for internal combustion engines - Google Patents

Fuel injection nozzle for internal combustion engines Download PDF

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Publication number
US3817456A
US3817456A US00380099A US38009973A US3817456A US 3817456 A US3817456 A US 3817456A US 00380099 A US00380099 A US 00380099A US 38009973 A US38009973 A US 38009973A US 3817456 A US3817456 A US 3817456A
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United States
Prior art keywords
valve
nozzle
fuel
during
duct
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Expired - Lifetime
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US00380099A
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English (en)
Inventor
J Schlappkohl
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Individual
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Individual
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Publication of US3817456A publication Critical patent/US3817456A/en
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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

Definitions

  • a fuel-injection nozzle for an internal combustion engine comprises a valve needle for controlling the flow of fuel via a throttle passage to a pressure chamber for a preliminary fuel injection out of the nozzle and for controlling of the flow of fuel via duct means to the pressure chamber for a main fuel injection out of the nozzle, during the opening stroke of the valve needle, and which nozzle is improved by valve means closed during rest position which valve means are mounted in the duct means and associated with the valve needle to be opened by the needle during its opening stroke; the free crosssectional area of the nozzle mouth which is-traversed by the fuel during the preliminary injection is smaller than the cross-sectional area of said throttle passage.
  • Such preand main injection valves are employed in order to reduce the loud ignition noises caused by high speed diesel engines while idling.
  • the preinjection and main injection of which the former preferably merges into the latter, a combustion of little noise is achieved which sets in smoothly and proceeds slowly in the beginning.
  • OBJECTS AND SUMMARY OF THE INVENTION ls is an object of the invention to develop an inexpensive valve means for preinjection and main injection which is free from the above-described drawbacks.
  • the valve is arranged coaxially with, the valve needle and comprises a movable valve member having a plug, and the valve needle comprises a return spring and a springretaining disc at a distance from the said plug which is as large as the preinjection opening stroke of the needle.
  • an auxiliary pressure chamber is provided upstream of the main pressure chamber, and these pressure chambers are connected with each other 'via a throttle passage which is open at all times, and via a valve-controlled fuel line; and a movable valve member of the valve plunges into the auxiliary pressure chamber when the valve is opened against a closing force.
  • a valve needle 2 having a throttle plug 3 is mounted to control an injection orifice 4 provided in a pressure chamber 5.
  • the nozzle head 1 is clamped together with three super-imposed discs 8, 9 and 10 in a nozzle holder 7 by means of a clamp bolt 6.
  • Disc 8 has a central bore 13 which houses a locking spring 11 and its spring seat disc 12.
  • a second pressure chamber 14 is provided in the form of a central recess which is connected at its one side via channels 15 and 15a to a line 15b for supplying fuel from the fuel injection pump (not shown), while on its other side recess 14 communicates with pressure chamber 5, on the one hand, via a duct 16 in which throttle 18 is inserted, and which conveys a preliminary fuel amount to the pressure chamber 5, and, on the other hand, via a duct 17 controlled by a valve 19 and serving to convey the main fuel amount.
  • Both ducts l6 and 17 extend through discs 8 and 9 into nozzle head 1.
  • Throttle 18 is mounted in that part of duct 16 which extends through disc 9.
  • Valve 9 comprises a movable valve member 22 which is displaceable for opening against the direction of fuel flow and is biassed by a closing spring 20, which is supported on the end wall of recess 14, so that valve member 22 moves into the recess 14 when opening.
  • valve needle 2 penetrates through a central opening at the upstream end of nozzle head 1 and causes spring seat disc 12 to abut against a pin 21 being a downstream extension of the movable valve member 22 and thereby lifts the valve member 22 from its seat 23a.
  • a fuel nozzle for an internal combustion engine which nozzle comprises a valve needle for controlling the flow of fuel via a throttle passage to pressure chamber means for a preliminary injection out of the mouth of the nozzle and for controlling the flow of fuel via duct means to said pressure chamber means for a main injection out of the mouth of the nozzle, during the opening stroke of the valve needle,
  • valve means closed during rest position which valve means is mounted in said duct means and associated with said needle to be opened by said needle during the opening stroke of the latter; the free cross-sectional area of the nozzle mouth being traversed by the fuel during the preliminary injection being smaller than the cross-sectional area of said throttle passage.
  • valve comprises a movable valve member having a pin extending in downstream direction, a spring biassing said valve member, and a spring seat disc, the distance between the downstream end of said pin and said spring seat disc being as large as the opening stroke of said valve needle during preliminary injection.
  • said pressure chamber means comprise a main chamber, and an auxiliary chamber upstream of said main chamber, and said duct means comprising a first duct from said auxiliary chamber to said main chamber, said throttle passage being located in said first duct and being open at all times, and second duct means from said auxiliary chamber to said main chamber, said valve means being interposed in said second duct.

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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)
US00380099A 1972-07-18 1973-07-17 Fuel injection nozzle for internal combustion engines Expired - Lifetime US3817456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2235083A DE2235083A1 (de) 1972-07-18 1972-07-18 Kraftstoffeinspritzduese fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3817456A true US3817456A (en) 1974-06-18

Family

ID=5850876

Family Applications (1)

Application Number Title Priority Date Filing Date
US00380099A Expired - Lifetime US3817456A (en) 1972-07-18 1973-07-17 Fuel injection nozzle for internal combustion engines

Country Status (5)

Country Link
US (1) US3817456A (cs)
JP (1) JPS4945219A (cs)
DE (1) DE2235083A1 (cs)
FR (1) FR2193421A5 (cs)
GB (1) GB1433513A (cs)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967597A (en) * 1973-10-03 1976-07-06 Robert Bosch G.M.B.H. Electromagnetically actuated fuel injection valve
US4215820A (en) * 1977-05-05 1980-08-05 Volkswagenwerk Aktiengesellschaft Injection device for an internal combustion engine
US4228960A (en) * 1977-09-09 1980-10-21 Lucas Industries Limited Liquid fuel injectors
US4250857A (en) * 1978-09-13 1981-02-17 The Bendix Corporation Fuel injector for producing shaped injection pulses
US4461427A (en) * 1981-02-17 1984-07-24 Robert Bosch Gmbh Fuel injection nozzle
US4566635A (en) * 1983-08-10 1986-01-28 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US5619969A (en) * 1995-06-12 1997-04-15 Cummins Engine Company, Inc. Fuel injection rate shaping control system
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5765755A (en) * 1997-01-23 1998-06-16 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5826793A (en) * 1995-12-12 1998-10-27 Lucas Industries, Plc Two rate fuel injector
US6360727B1 (en) 2000-03-14 2002-03-26 Alfred J. Buescher Reduce initial feed rate injector with fuel storage chamber
US20050006898A1 (en) * 2002-01-24 2005-01-13 Rainer Hardt Nozzle clamping nut for injection valves and method for producing said nozzle clamping nut
US20050045154A1 (en) * 2002-04-11 2005-03-03 Dieter Marksteiner Leakage connection for a fuel injector
EP1686257A2 (en) 2005-01-28 2006-08-02 Cummins Inc. Fuel injector with injection rate control

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3445825A1 (de) * 1984-12-15 1986-06-19 Klöckner-Humboldt-Deutz AG, 5000 Köln Brennstoffeinspritzsystem
US4736712A (en) * 1986-12-01 1988-04-12 General Electric Company Self purging dual fuel injector
DE3725618C2 (de) * 1987-08-03 2002-11-07 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
GB8829699D0 (en) * 1988-12-20 1989-02-15 Lucas Ind Plc Fuel injection nozzles
DE102013002969B3 (de) 2013-02-22 2014-05-22 L'orange Gmbh Kraftstoffinjektor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556369A (en) * 1947-04-05 1951-06-12 American Bosch Corp Accumulator type injection nozzle
US3640466A (en) * 1968-11-05 1972-02-08 Sulzer Ag Fuel injection system for an internal combustion piston engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556369A (en) * 1947-04-05 1951-06-12 American Bosch Corp Accumulator type injection nozzle
US3640466A (en) * 1968-11-05 1972-02-08 Sulzer Ag Fuel injection system for an internal combustion piston engine

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967597A (en) * 1973-10-03 1976-07-06 Robert Bosch G.M.B.H. Electromagnetically actuated fuel injection valve
US4215820A (en) * 1977-05-05 1980-08-05 Volkswagenwerk Aktiengesellschaft Injection device for an internal combustion engine
US4228960A (en) * 1977-09-09 1980-10-21 Lucas Industries Limited Liquid fuel injectors
US4250857A (en) * 1978-09-13 1981-02-17 The Bendix Corporation Fuel injector for producing shaped injection pulses
US4461427A (en) * 1981-02-17 1984-07-24 Robert Bosch Gmbh Fuel injection nozzle
US4566635A (en) * 1983-08-10 1986-01-28 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US5769319A (en) * 1995-01-23 1998-06-23 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5619969A (en) * 1995-06-12 1997-04-15 Cummins Engine Company, Inc. Fuel injection rate shaping control system
US5826793A (en) * 1995-12-12 1998-10-27 Lucas Industries, Plc Two rate fuel injector
US5765755A (en) * 1997-01-23 1998-06-16 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US6360727B1 (en) 2000-03-14 2002-03-26 Alfred J. Buescher Reduce initial feed rate injector with fuel storage chamber
US20050006898A1 (en) * 2002-01-24 2005-01-13 Rainer Hardt Nozzle clamping nut for injection valves and method for producing said nozzle clamping nut
US7475829B2 (en) 2002-01-24 2009-01-13 Siemens Aktiengesellschaft Nozzle clamping nut for injection valves and method for producing said nozzle clamping nut
US20050045154A1 (en) * 2002-04-11 2005-03-03 Dieter Marksteiner Leakage connection for a fuel injector
US7475674B2 (en) 2002-04-11 2009-01-13 Siemens Aktiengesellschaft Leakage connection for a fuel injector
EP1686257A2 (en) 2005-01-28 2006-08-02 Cummins Inc. Fuel injector with injection rate control
US20080006712A1 (en) * 2005-01-28 2008-01-10 Cummins Inc. Fuel injector with injection rate control
US7334741B2 (en) 2005-01-28 2008-02-26 Cummins Inc. Fuel injector with injection rate control
CN100445549C (zh) * 2005-01-28 2008-12-24 卡明斯公司 带有喷射速率控制器的燃料喷射器

Also Published As

Publication number Publication date
FR2193421A5 (cs) 1974-02-15
JPS4945219A (cs) 1974-04-30
GB1433513A (en) 1976-04-28
DE2235083A1 (de) 1974-01-31

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