US3613998A - Closing spring adjusting means for a fuel injection valve - Google Patents

Closing spring adjusting means for a fuel injection valve Download PDF

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Publication number
US3613998A
US3613998A US871865A US3613998DA US3613998A US 3613998 A US3613998 A US 3613998A US 871865 A US871865 A US 871865A US 3613998D A US3613998D A US 3613998DA US 3613998 A US3613998 A US 3613998A
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US
United States
Prior art keywords
valve
nut
spring
improvement
nozzle holder
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
US871865A
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English (en)
Inventor
Rudolf Krauss
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 US3613998A publication Critical patent/US3613998A/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
    • F02M61/04—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

Definitions

  • This invention relates to a valve, particularly a fuel injection valve of the type adapted for the injection of fuel into the suction tube of internal combustion engines.
  • the fuel injection valve is further of the type that includes a valve needle adapted to open in the direction of the fluid flow against the force of a closing spring.
  • the stem portion of the valve needle extends through the nozzle body and projects into a cavity of a nozzle holder, where its terminus is connected with the spring seat disc of a closing spring by turnable means adapted to vary the tension of said spring.
  • valve needle Only upon completing these steps may the valve needle be turned with respect to the spring seat disc for changing the preload (i.e. the force) of said spring. Subsequently, the locknut has to be tightened, the auxiliary securing device removed and the fuel injection valve reassembled.
  • the aforenoted turnable means comprises an internally threaded polygonal nut supports the spring seat disc and which is secured against rotation by inner wall faces of the nozzle holder complemental with said polygonal nut.
  • FIG. I is an axial sectional view of the fuel injection valve according to the invention.
  • FIG. 2 is a sectional view taken along line II-II of FIG. 1.
  • FIG. I there is shown a nozzle holder 1 provided with an axial bore 2 in which there is disposed a filter element 3. Downstream of the filter element 3, the bore 2 is enlarged to form a chamber 4 in which there are disposed the working parts of the fuel injection valve.
  • the chamber 4- is, at its downstream end, closed by a nozzle body 5 provided with an axial bore 6.
  • a valve needle generally indicated at 7 is disposed with respect to the nozzle body 5 and nozzle holder I in such a manner that the stem 7a of the valve needle extends through bore 6 and projects into chamber 4, while the hemispherical head 8 of the valve needle is arranged externally of the nozzle body 5 and is adapted to engage a complementally formed valve seat 5a.
  • a hexagonal nut 9 serving as a support for a spring seat disc 10 and a spring 11 which, with its other end, engages a radial shoulder 5b of the nozzle body 5.
  • a resilient, preferably plastic, insert 12 having a central bore surrounding valve stem 7a in a tight fit.
  • a polygonal extension 14; of the valve head 3 is engaged by a suitable tool, such as a socket wrench, or the like.
  • a suitable tool such as a socket wrench, or the like.
  • the valve needle 7 rotates with respect to the hexagonal nut 9.
  • the latter is prevented from turning with the rotating nut 9 by means of planar wall portions 13.
  • the hexagonal nut 9 is axially displaced with respect to the radial shoulder 5b of the nozzle body 5 and thus, the extent of compression or preload of closing spring II is changed.
  • valve needle 7 is disposed in bore 6 of the nozzle body 5 with a loose fit, so that an annular passageway is obtained through which the fuel may flow after the unseating of valve needle 7. Also, due to said loose fit, the bore 6 does not guide the valve needle 7 in its reciprocating motion, so that the latter is selfcentering as it assumes its closed (seated) position. In order to ensure that said selfcentering is not disturbed by an axially asymmetrical force caused, for example, by an inaccurate terminal plane of spring I 1, the engaging faces of the hexagonal nut 9 and those of the spring seat disc 10 have a complemental, spherical configuration.
  • the movable valve parts that is, the hexagonal nut 9, the spring seat disc 10, the spring 11 and the valve needle 7 are assembled with the nozzle body 5.
  • the nozzle body 5 is inserted into the nozzle holder ll, so that an internal shoulder 15 thereof abuts against the radial shoulder 5b of the nozzle body 5.
  • the sleevelike terminal portion of the nozzle holder 1 is crimped over an edge 16 of the nozzle body 5.
  • a valve particularly fuel injection valve of the known type that includes (A) a nozzle holder, (B) a valve needle formed of a valve stem and a valve head, (C) a valve seat, (D) a spring, (E) a spring seat disc engaged by one end of said spring, and (F) means threadedly secured to said valve stem and supporting said spring seat disc, said means being turnable to vary the preload of said spring urging said valve head into a closed position against said valve seat, the improvement comprising,
  • said complemental means is formed of at least one pair of diametrically opposed planar external faces of said nut and of at least one pair of diametrically opposed planar internal faces of said nozzle holder.
  • sert is provided with a throughgoing bore surrounding said valve stem with a tight fit, said insert is made of resilient material to frictionally and yieldingly engage said valve stem.

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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)
US871865A 1968-11-23 1969-10-28 Closing spring adjusting means for a fuel injection valve Expired - Lifetime US3613998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681810544 DE1810544A1 (de) 1968-11-23 1968-11-23 Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
US3613998A true US3613998A (en) 1971-10-19

Family

ID=5714103

Family Applications (1)

Application Number Title Priority Date Filing Date
US871865A Expired - Lifetime US3613998A (en) 1968-11-23 1969-10-28 Closing spring adjusting means for a fuel injection valve

Country Status (6)

Country Link
US (1) US3613998A (enrdf_load_stackoverflow)
AT (1) AT293794B (enrdf_load_stackoverflow)
DE (1) DE1810544A1 (enrdf_load_stackoverflow)
FR (1) FR2023987A1 (enrdf_load_stackoverflow)
GB (1) GB1257682A (enrdf_load_stackoverflow)
SE (1) SE352701B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030668A (en) * 1976-06-17 1977-06-21 The Bendix Corporation Electromagnetically operated fuel injection valve
US4057190A (en) * 1976-06-17 1977-11-08 Bendix Corporation Fuel break-up disc for injection valve
US4270257A (en) * 1975-04-26 1981-06-02 Ntn Toyo Bearing Co. Ltd. Method for manufacturing a fuel injection valve
US4281797A (en) * 1978-07-26 1981-08-04 Ntn Toyo Bearing Company, Limited Fuel injection device for internal combustion engines
US20140183286A1 (en) * 2011-08-08 2014-07-03 Mitsubishi Electric Corporation Fuel injection valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2047588C2 (de) * 1970-09-28 1982-10-21 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil für Brennkraftmaschinen
DE2826025A1 (de) * 1978-06-14 1979-12-20 Daimler Benz Ag Mehrzylindrige brennkraftmaschine
DE2936332A1 (de) * 1979-09-08 1981-03-26 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzventil und verfahren zur herstellung eines kraftstoffeinspritzventiles
DE3521040A1 (de) * 1985-06-12 1986-12-18 Vdo Adolf Schindling Ag, 6000 Frankfurt Einspritzventil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2035203A (en) * 1934-02-21 1936-03-24 John W Smith Method of and apparatus for feeding fuel
FR1032162A (fr) * 1951-02-07 1953-06-30 Injecteur pour l'injection de combustible dans des moteurs
GB819607A (en) * 1956-07-19 1959-09-09 Saurer Ag Adolph Improvements in fuel injection nozzles
US2975982A (en) * 1957-12-16 1961-03-21 Borg Warner Fuel injection nozzle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2035203A (en) * 1934-02-21 1936-03-24 John W Smith Method of and apparatus for feeding fuel
FR1032162A (fr) * 1951-02-07 1953-06-30 Injecteur pour l'injection de combustible dans des moteurs
GB819607A (en) * 1956-07-19 1959-09-09 Saurer Ag Adolph Improvements in fuel injection nozzles
US2975982A (en) * 1957-12-16 1961-03-21 Borg Warner Fuel injection nozzle

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270257A (en) * 1975-04-26 1981-06-02 Ntn Toyo Bearing Co. Ltd. Method for manufacturing a fuel injection valve
US4030668A (en) * 1976-06-17 1977-06-21 The Bendix Corporation Electromagnetically operated fuel injection valve
US4057190A (en) * 1976-06-17 1977-11-08 Bendix Corporation Fuel break-up disc for injection valve
US4281797A (en) * 1978-07-26 1981-08-04 Ntn Toyo Bearing Company, Limited Fuel injection device for internal combustion engines
US20140183286A1 (en) * 2011-08-08 2014-07-03 Mitsubishi Electric Corporation Fuel injection valve
US9810188B2 (en) * 2011-08-08 2017-11-07 Mitsubishi Electric Corporation Fuel injection valve

Also Published As

Publication number Publication date
SE352701B (enrdf_load_stackoverflow) 1973-01-08
FR2023987A1 (enrdf_load_stackoverflow) 1970-08-21
DE1810544A1 (de) 1970-06-11
AT293794B (de) 1971-10-25
GB1257682A (enrdf_load_stackoverflow) 1971-12-22

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