US3642212A - Fuel injection valve for a successive injection of an advance and a main fuel quantity - Google Patents

Fuel injection valve for a successive injection of an advance and a main fuel quantity Download PDF

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Publication number
US3642212A
US3642212A US14933A US3642212DA US3642212A US 3642212 A US3642212 A US 3642212A US 14933 A US14933 A US 14933A US 3642212D A US3642212D A US 3642212DA US 3642212 A US3642212 A US 3642212A
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US
United States
Prior art keywords
valve needle
valve
passage means
fuel
pressure chamber
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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
US14933A
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English (en)
Inventor
Willi Voit Stuttgart
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of US3642212A publication Critical patent/US3642212A/en
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    • 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
    • F02M61/06—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 being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/06—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the pressurisation of the fuel being caused by centrifugal force acting on the fuel

Definitions

  • FIG.5 3 Claims, 5 Drawing Figures PATENTEDFEB i 5 I972 FIG] FIG.5
  • This invention relates to a fuel injection valve which is associated with an internal combustion engine and which comprises a stepped valve needle slidably disposed in a nozzle body and displaceable by the pressure of fuel to be injected by said valve into said engine.
  • the valve needle includes work faces formed by annular shoulders between two immediately adjacent valve needle portions of differing diameters. Said work faces are disposed upstream of a valve seat and are exposed to said pressure in the opening direction of the valve. Each work face is disposed in a pressure chamber and is separated from the others by a valve needle portion guided in a fluidtight manner in the nozzle body. The valve needle, during the course of its strokes, controls the fuel admission between the pressure chambers.
  • the fuel admission from one pressure chamber to the other is effected through channels, the total flow passage section of which is varied during the course of the opening stroke of the valve needle.
  • Such a change of the flow passage section is effected by means of two radial bores of different diameters provided in the cylindrical guide portion of the nozzle body. The bores merge into a channel which, in turn, communicates with one of the pressure chambers. In the position of rest of the valve needle, only the smaller bore is open. During the course ofthe stroke ofthe valve needle, the smaller bore is closed and the bore of larger cross section is opened.
  • the total flow passage section between the pressure chambers varies during the stroke of the valve needle according to a pattern dependent upon the position of the bores or the valve needle edges which control said bores.
  • a control of two bores in the above manner has the disadvantage that there are required a pair of very accurately coordinated control edges and controlled bores. The manufacture of such structures is involved and expensive. Further, the deflection of the fuel flow from one bore to the other during the relatively short injection periods generates unavoidably eddy currents which impart disadvantageous pressure pulses on the valve needle and thus, dependent upon the rpm. of the engine, affect the control process in a varying extent.
  • the two pressure chambers are interconnected by means of at least one continuously open throttle channel.
  • the flow passage section of the throttle channel is selected in such a manner that during idling r.p.m., the entire delivered fuel quantity flows solely through said throttle channel.
  • FIG. 1 is an axial sectional view of a first embodiment
  • FIG. 2 is an axial sectional view of a second embodiment
  • FIG. 3 is an axial sectional view of a third embodiment
  • FIG. 4 is an axial sectional view of a fourth embodiment
  • FIG. 5 is an axial sectional view of a fifth embodiment.
  • a stepped valve needle which comprises a portion 2 of larger diameter and a portion 3 of smaller diameter. Both portions are guided in a fluidtight manner in the nozzle body.
  • An adjoining further portion 4 of smallest diameter includes a sealing face 5 which, in a closed position of the fuel injection valve, engages a valve seat 6 formed in the nozzle body I.
  • the shoulders separating the different valve needle portions 2, 3 and 4 form annular work faces which are exposed to the fuel pressure in the opening direction of the valve needle.
  • the work face 7 formed between the valve needle portions 2 and 3 operates in a pressure chamber 8 formed in the nozzle body 1.
  • a fuel supply channel 9 Into the pressure chamber 8 there merges a fuel supply channel 9.
  • the work face 10 formed between the valve needle portions 3 and 4 operates in a pressure chamber 11 also formed in the nozzle body I.
  • the pressure chamber 11 is delimited at its downstream end by the cooperating sealing face 5 and the valve seat 6.
  • the pressure chambers 8 and 11 are in continuous communication by means of a throttle channel 13. As soon as fuel flows from the fuel injection pump through the supply channel 9 into the pressure chamber 8, one part of said fuel passes through the throttle channel 13 into the pressure chamber 11. The pressure of the fuel in the pressure chambers exerts a force on the work faces of the valve needle in the opening direction thereof. As soon as said force overcomes the opposing force with which the valve needle is maintained in a closed position, the valve needle moves away from the seat 6 and thus fuel is injected into the internal combustion engine.
  • valve needle and the guide portions of the nozzle body cooperate in such a manner that the valve needle portion 3 emerges from its guiding bore thus permitting a substantially unthrottled fuel flow from chamber 8 to chamber 11 (from which it is injected into the engine) only when the fuel injection pump delivers to the fuel injection valve fuel quantities that are in excess of those needed for idling.
  • the flow passage section of throttle channel 13 is so designed that during idling r.p.m. of the internal combustion engine the entire fuel quantity that flows from chamber 8 to chamber 11 passes solely through the throttle channel 13.
  • the flow passage section of the nozzle opening 14 is controlled by a terminal pin 15 integral with the valve needle; the sealing face 5 and the valve seat 6 are of a complemental conical configuration.
  • the pressure chamber 11 is delimited at its downstream end by a frontal plate 16 containing the nozzle opening 14 and serving as a planar seat 6 for the planar sealing face 5 of the valve needle.
  • the throttle channel 13 extends in the nozzle body 1, whereas, in the embodiments shown in FIGS. 3 and 4, it extends in the valve needle portion 3 which, for this purpose, has a collarlike configuration.
  • the throttle channel l3 extends between the nozzle body 1 and a flattened part 3' provided in the valve needle portion 3.
  • a fuel injection valve associated with an internal combustion engine and being of the type that has (a) a nozzle body, (b) a reciprocating valve needle guided in said nozzle body in a fluidtight manner, (c) at least two axially spaced work faces provided on said valve needle and affected by fuel pressure for moving said valve needle, (d) a supply channel carrying fuel under pressure, the improvement comprising,
  • a second passage means interconnecting said first and 2.
  • said second passage means is formed of a bore traversed by said valve needle; said valve needle includes a portion disposed within said bore and obturating said second passage means when said valve needle is spaced from said valve seat at less than said predetermined distance, said portion of said valve needle is disposed externally of said bore and opening said second passage means when said valve needle is spaced from said valve seat farther than said predetermined distance.

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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)
US14933A 1969-03-08 1970-02-27 Fuel injection valve for a successive injection of an advance and a main fuel quantity Expired - Lifetime US3642212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691911914 DE1911914A1 (de) 1969-03-08 1969-03-08 Kraftstoffeinspritzventil fuer Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3642212A true US3642212A (en) 1972-02-15

Family

ID=5727570

Family Applications (1)

Application Number Title Priority Date Filing Date
US14933A Expired - Lifetime US3642212A (en) 1969-03-08 1970-02-27 Fuel injection valve for a successive injection of an advance and a main fuel quantity

Country Status (7)

Country Link
US (1) US3642212A (de)
AT (1) AT298162B (de)
DE (1) DE1911914A1 (de)
ES (1) ES185977Y (de)
FR (1) FR2037173A1 (de)
GB (1) GB1299473A (de)
RO (1) RO55421A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162043A (en) * 1977-03-08 1979-07-24 Robert Bosch Gmbh Fuel injection nozzle
US4275845A (en) * 1978-04-07 1981-06-30 M.A.N Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Fuel injector for internal combustion engines
US20040155131A1 (en) * 2000-05-08 2004-08-12 Bardos Gary M. Reducing machine rotor assembly and methods of constructing and operating the same
US6880774B2 (en) 2000-05-08 2005-04-19 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US20060196982A1 (en) * 2005-03-03 2006-09-07 Davis Devin R Reducing machine rotor assembly and inserts therefor and method of constructing the inserts

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225180A1 (de) * 1982-07-06 1984-01-12 Robert Bosch Gmbh, 7000 Stuttgart Einspritzventil
GB2234289A (en) * 1989-07-28 1991-01-30 Lucas Ind Plc A nozzle for a two-stage lift fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148192A (en) * 1938-05-27 1939-02-21 John W Dow Engine fuel injector
FR977818A (fr) * 1942-11-18 1951-04-05 Prec Mecanique Perfectionnements apportés aux dispositifs du genre des injecteurs pour moteurs à combustion interne
FR1048735A (fr) * 1950-11-13 1953-12-23 Gicleur à aiguille pour moteurs à combustion interne
US3442456A (en) * 1966-11-01 1969-05-06 Holley Carburetor Co Injection nozzle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148192A (en) * 1938-05-27 1939-02-21 John W Dow Engine fuel injector
FR977818A (fr) * 1942-11-18 1951-04-05 Prec Mecanique Perfectionnements apportés aux dispositifs du genre des injecteurs pour moteurs à combustion interne
FR1048735A (fr) * 1950-11-13 1953-12-23 Gicleur à aiguille pour moteurs à combustion interne
US3442456A (en) * 1966-11-01 1969-05-06 Holley Carburetor Co Injection nozzle

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162043A (en) * 1977-03-08 1979-07-24 Robert Bosch Gmbh Fuel injection nozzle
US4275845A (en) * 1978-04-07 1981-06-30 M.A.N Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Fuel injector for internal combustion engines
US20040155131A1 (en) * 2000-05-08 2004-08-12 Bardos Gary M. Reducing machine rotor assembly and methods of constructing and operating the same
US6880774B2 (en) 2000-05-08 2005-04-19 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US7055770B2 (en) 2000-05-08 2006-06-06 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US20060179634A1 (en) * 2000-05-08 2006-08-17 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US7624490B2 (en) 2000-05-08 2009-12-01 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US20100096483A1 (en) * 2000-05-08 2010-04-22 Morbak, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US8113453B2 (en) 2000-05-08 2012-02-14 Morbark, Inc. Reducing machine rotor assembly and methods of constructing and operating the same
US20060196982A1 (en) * 2005-03-03 2006-09-07 Davis Devin R Reducing machine rotor assembly and inserts therefor and method of constructing the inserts
US7438097B2 (en) 2005-03-03 2008-10-21 Morbark, Inc. Reducing machine rotor assembly and inserts therefor and method of constructing the inserts

Also Published As

Publication number Publication date
ES185977U (es) 1973-10-16
ES185977Y (es) 1974-07-16
AT298162B (de) 1972-04-25
GB1299473A (en) 1972-12-13
DE1911914A1 (de) 1970-09-24
FR2037173A1 (de) 1970-12-31
RO55421A (de) 1973-08-20

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