EP1446575B1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1446575B1
EP1446575B1 EP02758100A EP02758100A EP1446575B1 EP 1446575 B1 EP1446575 B1 EP 1446575B1 EP 02758100 A EP02758100 A EP 02758100A EP 02758100 A EP02758100 A EP 02758100A EP 1446575 B1 EP1446575 B1 EP 1446575B1
Authority
EP
European Patent Office
Prior art keywords
screw sleeve
outer contour
fuel injection
screw
valve
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
EP02758100A
Other languages
German (de)
English (en)
Other versions
EP1446575A1 (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

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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
    • F02M61/16—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 relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1.
  • a fuel injection valve is for example from the document DE 199 41 930 A1 known.
  • Such a fuel injection valve has a housing which comprises a first and a second body, wherein the first body is designed as a valve holding body and the second body as a valve body. Both bodies have a contact surface, with which they bear against each other directly or with the interposition of an intermediate disc.
  • a threaded sleeve is provided which surrounds the valve body and the valve holding body and possibly also the intermediate disc in the region 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, with which this rests against a contact surface of the second body, so the valve body.
  • the screw is formed substantially cylindrical and generates by screwing into the external thread of the valve holding body an axial force, with the valve holding body is pressed against the valve body.
  • a hexagon is ground to the threaded sleeve at its end facing the combustion chamber, so that the rotary tool, such as a wrench, can engage the surfaces of this hexagon to exert a corresponding torque on the screw.
  • the torque is introduced only via individual introduction lines, each with different torques. At higher torques may result in a considerable torsion of the screw and as a result occur fluctuations in the torque on the thread and thus fluctuations in the axial force with which the first body is pressed against the second body.
  • high-pressure fuel is passed through a passage penetrating the contact surfaces, as a result, leaks may occur at the contact surfaces.
  • the DE 42 14 646 A1 shows an injection valve with a nozzle body which is clamped by a clamping nut against a holding body.
  • the clamping nut has on its outer side a contour to which a corresponding tool for tightening the clamping nut can attack.
  • DE 100 17 112 and the DE 100 17 113 show each clamping nuts in a similar arrangement as the DE 42 14 646 A1 in which the outer contour is formed in each case only in a partial section of the clamping nut.
  • the fuel injection valve according to the invention with the characterizing features of claim 1, in contrast, has the advantage that the torque is introduced almost uniformly and independently of friction factors and dimensions in the threaded sleeve.
  • the torque is introduced over a large part of the outer circumferential surface of the threaded sleeve by the rotary tool.
  • the screw can not twist when screwed, and the axial forces are evenly distributed over the circumference.
  • On the contact surfaces of the two bodies acts a uniform surface pressure, so that the tightness is improved at the contact surfaces.
  • the outer circumferential surface of the screw sleeve has a major part of its length on an outer contour into which the corresponding screwing tool can engage. This can be done by the screwing a tangential force are exerted, with which the threaded sleeve can be screwed onto the external thread of the first body.
  • the outer contour of the screw extends both over the portion of the screw, which is located above the first body, as well as over the portion which is located above the second body.
  • the outer contour is formed by mutually parallel longitudinal grooves, which extend substantially parallel to the longitudinal axis of the threaded sleeve.
  • Such grooves can be easily and inexpensively bring into the outer circumferential surface in the screw and also can be appropriate tools that engage in such grooves, easily finished.
  • the outer contour is formed on the outer circumferential surface of the screw by flat contours.
  • FIG. 1 is a longitudinal section through an inventive fuel injection valve shown.
  • the fuel injection valve has a housing 1, which comprises a first body 3 and a second body 7, wherein between the two bodies 3, 7, an intermediate disc 5 is arranged.
  • the first body is formed as a valve holding body 3 and the second body as a valve body 7.
  • the valve holding body 3 rests with a contact surface 103 on the washer 5 and the valve body 7 with a contact surface 107 on the opposite side of the washer 5.
  • a Bore 12 is formed, which is designed as a blind bore and the combustion chamber side end is formed by a substantially conical 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, which is sealingly guided in a bore away from combustion chamber in the bore 12.
  • the valve needle 14 tapers to the combustion chamber to form a pressure shoulder 15 and merges at its combustion chamber end in a valve sealing surface 22 which cooperates with the valve seat 20.
  • a pressure chamber 17 is formed at the level of the pressure shoulder 15, which is connected via a valve needle 14 surrounding annular channel 19 with the valve seat 20.
  • the pressure chamber 17 is filled with fuel under high pressure via a not running in the sectional plane of the high-pressure passage 21 which extends in the valve body 7 through the washer 5 and the valve holding body 3 to a high-pressure fuel port of the fuel.
  • the intermediate disc 5 has a central opening 23, in which a pressure piece 25 is arranged, which bears against the valve needle 14 and the valve needle 14 faces away into a spring plate 27 passes.
  • the spring plate 27 in this case projects into a valve holder body 3 formed in the spring chamber 29, which is designed as a bore and extends coaxially to the bore 12.
  • a closing spring 30 is arranged under pressure bias, the combustion chamber facing away from the spring plate 27 and away from the combustion chamber is supported on a stationary surface of the valve holding body 3.
  • the pressure bias 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 from the pressure chamber 17 via the annular channel 19 to the injection ports 24 can flow. In reverse force relationships, the valve needle 14 is held in contact with the valve seat 20, and there is no fuel leak from the injection ports 24.
  • a screw 10 is arranged on the housing.
  • the screw 10 is designed substantially hollow cylindrical and has a longitudinal axis 37. At its end remote from the combustion chamber, an internal thread 42 is formed, with which it is screwed into a male thread 8 formed on the valve holding body 3.
  • the threaded sleeve 10 At its end facing the combustion chamber, has an inwardly projecting collar 110, on which an annular pressure surface 32 is formed, which rests against a likewise annular contact surface 34 on the valve body 7.
  • FIG. 2 shows a cross section through the fuel injection valve of FIG. 1 along the line II-II.
  • a knurling 36 is formed in the outer region, which forms the outer contour of the screw 10.
  • the knurling 36 here consists of mutually parallel longitudinal grooves 38 which have a triangular cross section and directly adjacent to each other.
  • the depth of the longitudinal grooves 38 is only a fraction of the shell thickness of the screw 10, so that no significant weakening of the screw 10 occurs.
  • the longitudinal grooves 38 are in this case formed parallel to the longitudinal axis 37 of the threaded sleeve 10.
  • FIG. 3 a further embodiment of the screw sleeve 10 according to the invention is shown.
  • the screw 10 is shown here cut in the lower, ie in the combustion chamber facing area.
  • the outer contour of the screw 10 is formed here by flat polished sections 40, of which six flat sections 40 are distributed uniformly over the circumference of the threaded sleeve 10, so that in cross section results in an outer shape that corresponds to an equilateral, regular hexagon.
  • longitudinal grooves 38 Both in the formation of longitudinal grooves 38 as well as surface grinding 40 is always provided that they extend at least over much of the length of the threaded sleeve 10. It is particularly advantageous if the longitudinal grooves 38 or the flat contours 40 extend at least approximately over the entire length of the threaded sleeve 10 so that the torque can also be introduced correspondingly over the entire length of the threaded sleeve 10.
  • more than six flat poles 40 are distributed over the circumference of the threaded sleeve 10, for example, eight, ten or twelve flat poles. These are preferably evenly distributed over the circumference of the threaded sleeve 10, so that there is a regular polygon in cross-section on the outline.
  • an outer contour is applied, are arranged distributed in the various recesses over a majority of the length of the screw 10 and over its entire circumference.
  • the depressions may in this case be formed as bores, as grooves or other pocket-like depressions.
  • FIG. 4 a suitable screwing tool is shown in its essential parts.
  • the screwing tool has two clamping jaws 45, each corresponding substantially 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 threaded sleeve 10.
  • the two clamping jaws 45 are in this case pressed together by a device not shown in the drawing in the indicated arrow direction, so that the knurling 47 of the clamping jaws 45 can not slip on the knurling 38 of the screw 10.
  • the knurling 47 of the clamping jaws 45 must be adapted accordingly, so that 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)

Claims (5)

  1. Injecteur de carburant de moteur à combustion interne comportant un boîtier (1) ayant un premier corps (3) et un second corps (7) appliqués l'un contre l'autre au moins indirectement par une surface d'appui (103, 107), en étant pressés l'un contre l'autre par un manchon fileté (10),
    le manchon fileté (10) étant en prise par un filetage intérieur (42) dans un filetage extérieur (8) du premier corps (3) et s'appliquant par une surface de poussée (32) contre une surface d'appui (34) du second corps (7),
    le manchon fileté (10) au moins sensiblement de forme cylindrique entourant les deux corps (3, 7) dans la région des surfaces d'appui (103, 107),
    le manchon fileté (10) ayant sur la plus grande partie de la longueur de sa surface-enveloppe, un contour extérieur permettant la prise d'un outil de vissage pour exercer avec cet outil de vissage, une force tangentielle sur le manchon fileté (10) ,
    le contour extérieur étant réalisé à la fois dans le segment du manchon fileté (10) qui se trouve au-dessus du premier corps (3) que sur le segment du manchon fileté (10) qui se trouve au-dessus du second corps (7) et
    le contour extérieur s'étend au moins sensiblement sur toute la longueur du manchon fileté (10),
    caractérisé en ce que
    le contour extérieur comporte des rainures longitudinales (38) parallèles, et au moins sensiblement parallèles à l'axe longitudinal (37) du manchon fileté (10).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le contour extérieur a un moletage (36).
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    le moletage (36) est formé de rainures longitudinales (38), parallèles, à section triangulaire, ces rainures étant directement adjacentes les unes aux autres.
  4. Outil de vissage d'un manchon fileté (10) selon l'une des revendications 1 à 3,
    caractérisé en ce que
    l'outil comporte deux mors (45) correspondant pratiquement à un cylindre creux divisé longitudinalement, et dont le côté intérieur présente un contour venant en prise dans le contour extérieur du manchon fileté (10).
  5. Outil de vissage selon la revendication 4,
    caractérisé en ce que
    le contour de la face intérieure des mors (45) est un moletage (47).
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
DE10155679 2001-11-13
DE10155679A DE10155679A1 (de) 2001-11-13 2001-11-13 Kraftstoffeinspritzventil für Brennkraftmaschinen
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 EP1446575A1 (fr) 2004-08-18
EP1446575B1 true 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
DE10017113B4 (de) 2000-04-06 2006-02-09 Ina-Schaeffler Kg Spannmutter
DE10017112B4 (de) 2000-04-06 2006-06-01 Schaeffler Kg Spannmutter

Also Published As

Publication number Publication date
WO2003046366A1 (fr) 2003-06-05
US20040104284A1 (en) 2004-06-03
JP4160903B2 (ja) 2008-10-08
DE50211930D1 (de) 2008-04-30
US6895938B2 (en) 2005-05-24
EP1446575A1 (fr) 2004-08-18
JP2005510657A (ja) 2005-04-21
DE10155679A1 (de) 2003-05-28

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