EP1446575A1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne

Info

Publication number
EP1446575A1
EP1446575A1 EP02758100A EP02758100A EP1446575A1 EP 1446575 A1 EP1446575 A1 EP 1446575A1 EP 02758100 A EP02758100 A EP 02758100A EP 02758100 A EP02758100 A EP 02758100A EP 1446575 A1 EP1446575 A1 EP 1446575A1
Authority
EP
European Patent Office
Prior art keywords
screw sleeve
injection valve
fuel injection
outer contour
valve according
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.)
Granted
Application number
EP02758100A
Other languages
German (de)
English (en)
Other versions
EP1446575B1 (fr
Inventor
Sieghart Maier
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
Publication of EP1446575A1 publication Critical patent/EP1446575A1/fr
Application granted granted Critical
Publication of EP1446575B1 publication Critical patent/EP1446575B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • B25B13/065—Spanners; Wrenches with rigid jaws of socket type characterised by the cross-section of the socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B25B13/481—Spanners; Wrenches for special purposes for operating in areas having limited access
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1.
  • a fuel injection valve for example from the document DE 199 41 930 AI.
  • Such a fuel injection valve has a housing which comprises a first and a second body, the first body being designed as a valve holding body and the second body being designed as a valve body. Both bodies have a contact surface with which they abut one another directly or with the interposition of an intermediate disk.
  • a screw sleeve is provided which surrounds the valve body and the valve holding body and also, if appropriate, the intermediate disk in the area of the contact surfaces.
  • the screw sleeve has an internal thread with which it engages in an external thread formed on the valve holding body.
  • a pressure surface is formed on the screw sleeve, with which it rests on a contact surface of the second body, that is to say the valve body.
  • the screw sleeve is essentially cylindrical and generates an axial force by screwing into the external thread of the valve holding body the valve holding body is pressed against the valve body.
  • a hexagon is ground on the screw sleeve at its end facing the combustion chamber, so that the turning tool, for example an open-ended wrench, can grip the surfaces of this hexagon in order to exert a corresponding torque on the screw sleeve.
  • the torque is only introduced via individual initiation lines, each with different torques.
  • high fuel pressure is passed through a channel penetrating the contact surfaces in many fuel injection valves, this can result in leaks at the contact surfaces.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the torque is introduced almost uniformly and regardless of friction factors and dimensions in the screw sleeve.
  • the torque is introduced by the turning tool over a large part of the outer surface area of the screw sleeve.
  • the screw sleeve cannot twist when screwing in, and the axial forces are evenly distributed over the circumference.
  • a uniform surface pressure acts on the contact surfaces of the two bodies, so that the tightness on the contact surfaces is improved.
  • the outer circumferential surface of the screw sleeve has an outer contour over a large part of its length, into which the corresponding screwing tool can engage. This allows through the screwing tool is exerted a tangential force with which the screw sleeve can be screwed onto the external thread of the first body.
  • the outer contour of the screw sleeve extends both over the section of the screw sleeve which is located above the first body and over the section which is located above the second body.
  • the outer contour is formed by mutually parallel longitudinal grooves which run essentially parallel to the longitudinal axis of the screw sleeve.
  • Such grooves can be made easily and inexpensively in the outer surface of the screw sleeve, and corresponding tools which engage in such grooves can also be easily manufactured.
  • the outer contour is formed on the outer surface of the screw sleeve by flat grinding. It is particularly advantageous here to design six flat grindings such that there is a regular hexagon on the outer line in the cross section of the screw sleeve. It is also advantageous to have more than six flat cuts on the outer surface form the screw sleeve, which are also arranged evenly distributed over the circumference.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention
  • FIG. 2 shows a cross section through FIG. 1 along the line II-I
  • FIG. 3 shows a partially sectioned illustration of a further screw sleeve according to the invention
  • FIG. 4 shows a perspective view of a screwing tool for screwing a screw sleeve according to the invention.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention.
  • the Kraf material injection valve has a housing 1, which comprises a first body 3 and a second body 7, wherein an intermediate plate 5 is arranged between the two bodies 3, 7.
  • the first body is designed as a valve holding body 3 and the second body as a valve body 7.
  • the valve holding body 3 bears with a contact surface 103 on the intermediate disk 5 and the valve body 7 with a contact surface 107 on the opposite side of the intermediate disk 5.
  • In the valve body 7 there is one Bore 12 formed, which is designed as a blind bore and the combustion chamber end is formed by an essentially conical valve seat 20.
  • valve body 7 Combustion chamber facing from the valve seat 20, a plurality of injection openings 24 are formed in the valve body 7, which establish the connection to the combustion chamber of the internal combustion engine.
  • a piston-shaped valve needle 14 is arranged in the bore 12 and is sealingly guided in the bore 12 in a section facing away from the combustion chamber.
  • the valve needle 14 tapers towards the combustion chamber to form a pressure shoulder 15 and merges at its end on the combustion chamber side into a valve sealing surface 22 which interacts with the valve seat 20.
  • a radial expansion of the bore 12 forms a pressure chamber 17 at the level of the pressure shoulder 15, which is connected to the valve seat 20 via an annular channel 19 surrounding the valve needle 14.
  • the pressure chamber 17 can be filled with fuel under high pressure via a high-pressure channel 21 which does not run in the sectional plane and which extends in the valve body 7, through the intermediate disk 5 and the valve holding body 3 up to a high-pressure fuel connection of the fuel injection valve.
  • the intermediate disc 5 has a central opening 23, in which a pressure piece 25 is arranged, which abuts the valve needle 14 and merges into a spring plate 27 facing away from the valve needle 14.
  • the spring plate 27 projects into a spring chamber 29 which is formed in the valve holding body 3 and is designed as a bore and extends coaxially to the bore 12.
  • a closing spring 30 is arranged under pressure, which is supported on the spring plate 27 facing the combustion chamber and on a fixed surface of the valve holding body 3 facing away from the combustion chamber.
  • the prestressing of the closing spring 30 results in an axial force on the valve needle 14, which presses the valve sealing surface 22 against the valve seat 20.
  • the pressure in the pressure chamber 17 results in a hydraulic force on the pressure shoulder 15 and on parts of the valve sealing surface 22.
  • valve needle 14 moves in the axial direction and lifts with the valve sealing surface 22 from the valve seat 20, so that fuel can flow from the pressure chamber 17 via the ring channel 19 to the injection openings 24. In the case of reverse force conditions, the valve needle 14 is held in contact with the valve seat 20 and no fuel can escape from the injection openings 24.
  • a screw sleeve 10 is arranged on the housing 1.
  • the screw sleeve 10 is substantially hollow-cylindrical and has a longitudinal axis 37.
  • An internal thread 42 is formed on its end region facing away from the combustion chamber, with which it is screwed into an external thread 8 formed on the valve holding body 3.
  • the screw sleeve 10 At its end facing the combustion chamber, the screw sleeve 10 has an inwardly projecting collar 110, on which an annular pressure surface 32 is formed, which rests on a likewise annular contact surface 34 on the valve body 7.
  • the screw sleeve 10 moves in the axial direction due to the threads 42 or 8, the pressure surface 32 being pressed against the contact surface 34.
  • the valve body 7 with the contact surface 107 is pressed against the intermediate plate 5 and the intermediate plate 5 is in turn pressed against the contact surface 103 of the valve holding body 3.
  • FIG 2 shows a cross section through the fuel injection valve of Figure 1 along the line II-II.
  • Knurling 36 which forms the outer contour of the screw sleeve 10
  • the knurling 36 here consists of mutually parallel longitudinal grooves 38 which have a triangular cross section and are directly adjacent to one another.
  • the depth of the longitudinal ten 38 is only a fraction of the shell thickness of the screw sleeve 10, so that there is no significant weakening of the screw sleeve 10.
  • the longitudinal grooves 38 are formed parallel to the longitudinal axis 37 of the screw sleeve 10.
  • FIG. 3 shows a further exemplary embodiment of the screw sleeve 10 according to the invention.
  • the screw sleeve 10 is in the lower, d. H. shown in section in the area facing the combustion chamber.
  • the outer contour of the screw sleeve 10 is formed here by flat bevels 40, of which six flat bevels 40 are evenly distributed over the circumference of the screw sleeve 10, so that there is an external shape in cross section that corresponds to an equilateral, regular hexagon.
  • the torque can be introduced over the entire length of the screw sleeve 10 using a suitable screwing tool, which comprises the screw sleeve 10 over its entire length and is correspondingly in contact with all flat bevels 40.
  • longitudinal grooves 38 as well as flat cuts 40, it is always provided that these extend at least over a large part of the length of the screw sleeve 10. It is particularly advantageous if the longitudinal grooves 38 or the flat bevels 40 extend at least approximately over the entire length of the screw sleeve 10, so that the torque can also be introduced accordingly over the entire length of the screw sleeve 10.
  • more than six flat cuts 40 are arranged distributed over the circumference of the screw sleeve 10, for example eight, ten or twelve flat cuts. These are preferably evenly distributed over the circumference of the screw sleeve 10, so that there is a regular polygon in cross section on the outer line.
  • an outer contour is applied to the outer lateral surface of the screw sleeve 10, in which different recesses are arranged distributed over a large part of the length of the screw sleeve 10 and over its entire circumference. With a suitable screwing tool that engages in these recesses, a corresponding torque can be introduced.
  • the depressions can be designed as bores, as grooves or other pocket-like depressions.
  • a suitable screwing tool is shown in its essential parts in FIG.
  • the screwing tool has two clamping jaws 45, each of which essentially corresponds to half a hollow cylinder.
  • the inside of the clamping jaws 45 has a knurling 47 which is such that it can engage in the knurling 36 of the screw sleeve 10.
  • the two clamping jaws 45 are pressed against one another in the indicated direction of the arrow by a device (not shown in the drawing), so that the knurling 47 of the clamping jaws 45 cannot slip on the knurling 38 of the screw sleeve 10.
  • the knurling 47 of the clamping jaws 45 must be adapted accordingly, so that a secure toothing between the screwing tool and the clamping sleeve 10 also takes place in this case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape d'injection de carburant pour moteurs à combustion interne, comportant une enveloppe (1) dotée d'un premier élément (3) et d'un deuxième élément (7), lesquels sont mutuellement adjacents au moins indirectement par l'intermédiaire d'une surface d'appui (103, 107) respective et sont poussés l'un contre l'autre au moyen d'une gaine filetée (10). Cette gaine filetée (10) est en prise par un filetage intérieur (42) avec un filetage extérieur (8) du premier élément (3) et elle appuie par une surface de pression (32) contre une surface d'appui (34) du deuxième élément (7). Ladite gaine filetée (10), qui est au moins approximativement cylindrique, entoure les deux éléments (3, 7) dans la zone des surfaces d'appui (103, 107). L'invention est caractérisée en ce que la gaine filetée (10) comporte, sur sa surface extérieure et sur une grande partie de sa longueur, un profilé extérieur, sur lequel un tournevis peut être mis en prise, de sorte qu'une force tangentielle soit exercée sur la gaine filetée (10) au moyen du tournevis.
EP02758100A 2001-11-13 2002-07-17 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1446575B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10155679A DE10155679A1 (de) 2001-11-13 2001-11-13 Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10155679 2001-11-13
PCT/DE2002/002611 WO2003046366A1 (fr) 2001-11-13 2002-07-17 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1446575A1 true EP1446575A1 (fr) 2004-08-18
EP1446575B1 EP1446575B1 (fr) 2008-03-19

Family

ID=7705572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02758100A Expired - Lifetime EP1446575B1 (fr) 2001-11-13 2002-07-17 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (5)

Country Link
US (1) US6895938B2 (fr)
EP (1) EP1446575B1 (fr)
JP (1) JP4160903B2 (fr)
DE (2) DE10155679A1 (fr)
WO (1) WO2003046366A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039980A1 (de) * 2010-08-31 2012-03-01 Man Diesel & Turbo Se Zentriervorrichtung für eine Kraftstoffeinspritzdüse

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565320A (en) * 1982-03-15 1986-01-21 Yanmar Diesel Engine Co. Ltd. Unit injector of internal combustion engine
US5160178A (en) * 1991-12-17 1992-11-03 Kabushiki Kaisha Com Direct sealing coupling
DE4214646A1 (de) * 1992-05-02 1993-11-04 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer vor- und haupteinspritzung
DE4218943A1 (de) * 1992-06-10 1993-12-16 Bosch Gmbh Robert Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE4432686C2 (de) * 1994-09-14 1996-09-05 Man B & W Diesel Ag Querschnittgesteuerte Einspritzdüse
KR100190875B1 (ko) * 1996-12-06 1999-06-01 정몽규 디젤 엔진의 고압 인젝터
US6286768B1 (en) * 1998-03-27 2001-09-11 Cummins Engine Company, Inc. Pinned injector assembly
US6085991A (en) * 1998-05-14 2000-07-11 Sturman; Oded E. Intensified fuel injector having a lateral drain passage
DE10017112B4 (de) * 2000-04-06 2006-06-01 Schaeffler Kg Spannmutter
DE10017113B4 (de) * 2000-04-06 2006-02-09 Ina-Schaeffler Kg Spannmutter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03046366A1 *

Also Published As

Publication number Publication date
EP1446575B1 (fr) 2008-03-19
US20040104284A1 (en) 2004-06-03
US6895938B2 (en) 2005-05-24
WO2003046366A1 (fr) 2003-06-05
DE50211930D1 (de) 2008-04-30
JP2005510657A (ja) 2005-04-21
JP4160903B2 (ja) 2008-10-08
DE10155679A1 (de) 2003-05-28

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