US3703184A - Sealing means for fuel injection valves - Google Patents

Sealing means for fuel injection valves Download PDF

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Publication number
US3703184A
US3703184A US3703184DA US3703184A US 3703184 A US3703184 A US 3703184A US 3703184D A US3703184D A US 3703184DA US 3703184 A US3703184 A US 3703184A
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US
United States
Prior art keywords
guide sleeve
valve
valve body
packing ring
face
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
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English (en)
Inventor
Friedrich Messerschmidt
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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
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Publication of US3703184A publication Critical patent/US3703184A/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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7835—Valve seating in direction of flow

Definitions

  • valve needle In a fuel injection valve the valve needle is slidably held by a guide sleeve having a spherical head that cooperates with a spherical support in the valve body to permit a slight swiveling motion of the sleeve and thus a centering of the valve needle with respect to its valve seat. Below its spherical portion, the said head is also supported by an internal shoulder of the valve body with the interposition of a metallic ring and an axially and radially sealing packing ring.
  • This invention relates to a fuel injection valve and is of the type that has a guide sleeve positioned in a valve body and receiving, for a fluid tight reciprocation, a valve needle, one terminus of which cooperates with a valve seat.
  • the guide sleeve is urged against a support shoulder in the valve body through an interposed elastic element which surrounds a cylindrical portion of the guide sleeve.
  • the latter is further provided with a spherical head portion which permits a free motion of said valve terminus.
  • Fuel injection valves of the aforeoutlined structure have the advantage that the valve needle, by virtue of the spherically supported, slightly swivelable guide sleeve, automatically centers itself with respect to the valve seat as the fuel injection valve closes.
  • the area of engagement between the spherical head of the guide sleeve and a support face in the valve body serves simultaneously as a sealing means.
  • It is a disadvantage of fuel injection valves of this type that the smallest soiling of the sealing face by foreign particles may adversely affect the sealing and thus the proper operation of the fuel injection nozzle. If, in order to avoid this disadvantage, the sealing face is designed small, that is, the area of engagement is very narrow, then high specific pressures appear which, although they improve the sealing, require a special handling of the supporting or bearing components.
  • the aforementioned elastic element is constituted by a packing ring which seals radially as well as axially. Between the packing ring and a support shoulder of the guide sleeve or the valve body there is disposed a metallic ring which ensures a uniform deformation of the elastic ring, thus obtaining a scaling in both an axial and a radial direction.
  • FIG. 1 is an axial sectional view of the entire fuel injection valve according to the preferred embodiment.
  • FIG. 2 is an axial sectional view on an enlarged scale of some of the components shown in FIG. 1.
  • valve body 1 of a bar-shaped fuel injection valve there is fixedly held a nozzle body 2 which contains a pressure chamber 3, a valve seat 4 and nozzle openings (not shown).
  • a nozzle body 2 which contains a pressure chamber 3, a valve seat 4 and nozzle openings (not shown).
  • valve body 1 Within the valve body 1 there is disposed an elongated valve needle 5 which is guided in a fluid-tight manner by a surrounding guide sleeve 6.
  • the conical tip 5a of the valve needle 5 is continuously urged towards the valve seat 4 by a closing spring 7 with the inter-position of a spring seat disc 8.
  • the spring 7 engages with its other end an inner face of a sleeve nut 9 which is threaded into the valve body 1 and which contains an abutment pin 10 for limiting the stroke of the valve needle 5.
  • valve body 1 is tightened by means of the sleeve nut 9 to a washer 11, the inner conical face 12 of which is in engagement with a spherical outer portion 13 of the guide sleeve 6, as best shown in FIG. 2.
  • the valve needle 5, during the closing. movement centers itself automatically as soon as the conical tip 5a of the valve needle 5 is in engagement with the conical seat 4 as best shown in FIG. 1.
  • the valve body 1 is provided with a shoulder 16 which supports a metal ring 17.
  • the latter is, along its entire outer cylindrical face, in a close contacting engagement with the valve body 1, while it has a small clearance with respect to the guide sleeve 6.
  • the metal ring 17 is in contact with a second metal ring 18 which, conversely to the metal ring 17, is, with its inner face, in contact with the guide sleeve 6, while it has a radial clearance with respect to the nozzle body 1.
  • the two metal rings 17, 18 exert a force on an elastic packing ring 19 which engages a shoulder 20 of the guide sleeve 6 and which is slightly compressed, thus sealing in both a radial and an axial direction.
  • the second metal ring 18 in the first place,
  • the fuel forwarded under pressure to the fuel injection valve in pulses from a fuel injection pump through a pressure conduit (not shown) is admitted through a conduit 22 to an annular chamber 23 disposed between the valve needle 5 and the valve body 1 and therefrom to the pressure chamber 3.
  • the pressurized fuel is admitted through an annular clearance 24 defined between the valve body 1 and the guide sleeve 6 to the exposed radial faces 17a, 18a of the metal rings 17 and 18, respectively.
  • the pressurized fuel urges the metal rings l7, 18 against the packing ring 19 which, during each delivery thrust, is compressed and thus fully seals.
  • a fuel injection valve of the type that has (a) a hollow valve body, (b) a valve needle reciprocating in said valve body, (0) a valve seat cooperating with said valve needle, (d) an internal shoulder forming part of said valve body and (e) a guide sleeve positioned in said valve body for a fluid tight guiding of said valve needle; said guide sleeve has a spherical head portion to permit a centering of said valve needle with respect to said valve seat and a face of engagement cooperating with said internal shoulder for supporting said guide sleeve, the improvement comprising,
  • said means for compressing said packing ring includes two metal rings having radial faces in contact with one another; one of said metal rings has a radial face in contact with a radial face of said packing ring; one of said metal rings has an outer face in circumferential contact with an inner wall of said valve body and an inner face radially spaced from said guide sleeve; the other of said metal rings has an outer face radially spaced from said inner wall of said valve body and an inner face in circumferential contact with said guide sleeve.
  • said means for compressing said packing ring includes a metal ring having a first face cooperating with said packing ring and a second, opposed face including an exposed portion; said improvement includes means for admitting fuel under pressure to said metal ring for exerting a force on said exposed portion to urge said metal ring against said packing ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US3703184D 1970-06-29 1971-06-29 Sealing means for fuel injection valves Expired - Lifetime US3703184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702032005 DE2032005A1 (de) 1970-06-29 1970-06-29 Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
US3703184A true US3703184A (en) 1972-11-21

Family

ID=5775219

Family Applications (1)

Application Number Title Priority Date Filing Date
US3703184D Expired - Lifetime US3703184A (en) 1970-06-29 1971-06-29 Sealing means for fuel injection valves

Country Status (6)

Country Link
US (1) US3703184A (https=)
BE (1) BE769165A (https=)
CH (1) CH529918A (https=)
DE (1) DE2032005A1 (https=)
FR (1) FR2100052A5 (https=)
GB (1) GB1312858A (https=)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617957A (en) * 1983-07-25 1986-10-21 Xomox Corporation Rotary plug valve
FR2791740A1 (fr) * 1999-03-31 2000-10-06 Siemens Ag Dispositif de reglage soumis a une pression, notamment pour injecteur de carburant
WO2001002718A1 (de) * 1999-06-29 2001-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventil für brennkraftmaschinen
WO2002033249A1 (de) * 2000-10-19 2002-04-25 Robert Bosch Gmbh Brennstoffeinspritzventil
US6467754B2 (en) * 2000-02-24 2002-10-22 Delphi Technologies, Inc. Adaptable gas and moisture shield for a gas management valve
US20040046060A1 (en) * 2001-07-27 2004-03-11 Walter Maurer Fuel injection valve
EP1445480A1 (en) * 2003-02-04 2004-08-11 Siemens VDO Automotive S.p.A. Metering device with dynamic sealing
US20040262921A1 (en) * 2003-06-27 2004-12-30 Denso Corporation Pipe coupling device
FR2857061A1 (fr) * 2003-07-02 2005-01-07 Bosch Gmbh Robert Injecteur de carburant pour un moteur a combustion interne
US20200207173A1 (en) * 2018-12-28 2020-07-02 Volvo Car Corporation Spherical support for a spring seat in a vehicle suspension system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8926478D0 (en) * 1989-11-23 1990-01-10 Lucas Ind Plc Fuel injector
GB2240587A (en) * 1990-02-03 1991-08-07 Lucas Ind Plc I.c. engine fuel injection nozzle
GB9008403D0 (en) * 1990-04-12 1990-06-13 Lucas Ind Plc Fuel injection nozzle
DE19518413A1 (de) * 1995-05-19 1996-08-01 Daimler Benz Ag Verfahren und Vorrichtung zur Abdichtung hydraulischer oder pneumatischer Kolben
DE19956830C2 (de) * 1999-11-25 2002-07-18 Siemens Ag Durchführung
DE10115325A1 (de) † 2001-03-28 2002-10-17 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung, insbesondere Injektor, für Brennkraftmaschinen
DE60204454T2 (de) * 2002-08-20 2006-05-04 Siemens Vdo Automotive S.P.A., Fauglia Dosiervorrichtung mit hydraulischem Ring

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639193A (en) * 1947-02-05 1953-05-19 American Bosch Corp Fuel injection device
US3406912A (en) * 1966-05-09 1968-10-22 Bosch Arma Corp Capsulated fuel injection nozzle
US3477648A (en) * 1967-07-12 1969-11-11 Vernon D Roosa Fuel injection nozzle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639193A (en) * 1947-02-05 1953-05-19 American Bosch Corp Fuel injection device
US3406912A (en) * 1966-05-09 1968-10-22 Bosch Arma Corp Capsulated fuel injection nozzle
US3477648A (en) * 1967-07-12 1969-11-11 Vernon D Roosa Fuel injection nozzle

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617957A (en) * 1983-07-25 1986-10-21 Xomox Corporation Rotary plug valve
FR2791740A1 (fr) * 1999-03-31 2000-10-06 Siemens Ag Dispositif de reglage soumis a une pression, notamment pour injecteur de carburant
WO2001002718A1 (de) * 1999-06-29 2001-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventil für brennkraftmaschinen
US6467754B2 (en) * 2000-02-24 2002-10-22 Delphi Technologies, Inc. Adaptable gas and moisture shield for a gas management valve
US6719220B2 (en) 2000-10-19 2004-04-13 Robert Bosch Gmbh Fuel injection valve
WO2002033249A1 (de) * 2000-10-19 2002-04-25 Robert Bosch Gmbh Brennstoffeinspritzventil
US20040046060A1 (en) * 2001-07-27 2004-03-11 Walter Maurer Fuel injection valve
EP1445480A1 (en) * 2003-02-04 2004-08-11 Siemens VDO Automotive S.p.A. Metering device with dynamic sealing
US20040262921A1 (en) * 2003-06-27 2004-12-30 Denso Corporation Pipe coupling device
US6981722B2 (en) 2003-06-27 2006-01-03 Denso Corporation Pipe coupling device
FR2857061A1 (fr) * 2003-07-02 2005-01-07 Bosch Gmbh Robert Injecteur de carburant pour un moteur a combustion interne
US20200207173A1 (en) * 2018-12-28 2020-07-02 Volvo Car Corporation Spherical support for a spring seat in a vehicle suspension system
US10919356B2 (en) * 2018-12-28 2021-02-16 Volvo Car Corporation Spherical support for a spring seat in a vehicle suspension system

Also Published As

Publication number Publication date
DE2032005A1 (de) 1972-01-05
FR2100052A5 (https=) 1972-03-17
GB1312858A (en) 1973-04-11
BE769165A (fr) 1971-11-03
CH529918A (de) 1972-10-31

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