EP2187042A1 - Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit - Google Patents

Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit Download PDF

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Publication number
EP2187042A1
EP2187042A1 EP08105797A EP08105797A EP2187042A1 EP 2187042 A1 EP2187042 A1 EP 2187042A1 EP 08105797 A EP08105797 A EP 08105797A EP 08105797 A EP08105797 A EP 08105797A EP 2187042 A1 EP2187042 A1 EP 2187042A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
retaining nut
head
injector
nozzle retaining
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.)
Withdrawn
Application number
EP08105797A
Other languages
German (de)
English (en)
Inventor
Stefan Haug
Dirk Mallow
Dieter Junger
Jens-Peter Nagel
Thomas Soehner
Hrvoje Lalic
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
Priority to EP08105797A priority Critical patent/EP2187042A1/fr
Publication of EP2187042A1 publication Critical patent/EP2187042A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • the invention relates to the field of fuel injectors and specifically to the nozzle retaining nut and the nozzle of the injector.
  • the fuel injectors known in the state of the art typically comprise a nozzle, a needle moving inside the nozzle, an injector body, the nozzle being fixed to the injector body by a nozzle retaining nut.
  • the nozzle is normally made of different parts which are manufactured separately and assembled together. The positioning pins are used to hold the different parts of the nozzle tightly in place so that the parts of the nozzle do not move with respect to each other because of the high pressure in the nozzle.
  • the nozzle is fixed to the injector body using a nozzle retaining nut which has threads at one end and a head at the other end.
  • the axial pre-load forces at any screw are influenced by the friction in the thread (thread friction) and friction at the screw head (head friction). The friction is dependent upon the effective friction diameter in the thread (pitch diameter) and the average diameter of the bearing surface. If no effective friction diameter is available, the axial pre-load force resulting from the torque is scattered.
  • the component to be attached which is in contact with the screw head, is heavily loaded or twisted.
  • the load on the positioning pins increases, which can result in a malfunction of the injectors.
  • the contact of the nozzle retaining nut is changed due to the deflection of the average friction radius depending on the screw force.
  • the contact geometry is inclined to the so-called scores. Both of them lead to an increased dispersion of the axial pre-load force.
  • a coating for reducing the dispersion will result in increase in the component costs. It also affects only a conditional improvement of the friction coefficient and is mainly effective during the initial threaded connection of the components when the retaining nut is fixed for the first time.
  • the invention generates increased axial pre-load force for a given mounting torque by reducing the friction diameter of the head, resulting in tight coupling of the different parts of the injector with each other.
  • the reduction of the friction diameter of the head is achieved by varying the angle between the nozzle surface and the nozzle retaining nut.
  • the angle difference between the surface of the head of the nozzle retaining nut and the surface of the nozzle is easily achieved by variation in the angle at the nozzle or variation in the angle of the head of the nozzle retaining nut and does not require any complex design of the nozzle retaining nut.
  • the angle difference to be selected is dependent on the geometry and the material of the components to be screwed.
  • the force acting on the nozzle is near the inner end of the nozzle retaining nut.
  • the hold-down force which is initiated during the threaded connection process in the plate, can be reduced ( reduced load on the components). Furthermore, the use of positioning pins can be completely avoided due to this measure.
  • a typical fuel injector comprising of an injector body, a nozzle and a nozzle retaining nut 116.
  • the nozzle comprises of different parts 106 and 108, fixed to each other using the positioning pins 104.
  • the positioning pins 104 ensure that the parts 106 and 108 do not move with respect to each other during the operation of the nozzle which involves high pressures in the nozzle.
  • the nozzle ( 106, 108 ) is fixed to the injector body ( 100, 103 ) with the nozzle retaining nut 116 with the help of threads 102, 90 and a contact at the head 110.
  • a torque 112 is applied at the base of the nozzle retaining nut 116.
  • the torque 112 generates an axial force which will press the parts 100, 103, 106 and 108 together to fit with each other and hold tightly with the help of positioning pins 104.
  • the torque 112 applied at the base of the nozzle retaining nut gets split into the head friction torque 114 and the thread friction torque 118.
  • the invention proposes a measure to increase the axial pre-load force by reduction of the effective friction diameter at the screw head ( 110 ) by means of a defined angle difference between the nozzle retaining nut 116 and the surface of the nozzle 109.
  • Fig. 2 Shown in Fig. 2 is the schematic of the injector.
  • the Fig. 3 show the detailed view of the invention. Shown in the figure is the cross sections of a part of the nozzle 108 and the head of the nozzle retaining nut 116.
  • the head 110 of the nozzle retaining nut 116 makes contact with the nozzle surface 109.
  • the effective diameter of the head of the nozzle nut is defined as the distance between the inner contact points between the head surface 110 and the surface of the nozzle 109.
  • the effective diameter 300 of the head of the nozzle retaining nut 116 for a given force is varied by varying the angle 201 between the head 110 and the surface of the nozzle 109 where the head is in contact.
  • the effective diameter 300 increases when the retaining nut is turned depending on the axial force.
  • the Fig. 4 shows as an illustration how the change in the angle 201 changes the effective diameter 300 of the head.
  • This difference angle can be set at both the components alternatively by means of a variation in the angles at the surface of the nozzle or the head of the nozzle retaining nut.
  • Fig. 5 shows the surface of the nozzle 109 having 90 degrees with vertical axis and head surface 110 of the nozzle retaining nut having less than 90 degrees with vertical axis. Variation of these angles will vary the effective friction diameter of the head surface.
  • Fig. 6 shows the surface of the nozzle 109 having less than 90 degrees with vertical axis and head surface 110 of the nozzle retaining nut having 90 degrees with vertical axis.
  • the angle difference and the tolerance window is to be set in such a way that the average friction diameter at the surface does not shift outwards in a major way during the threaded connection process.
  • the angle difference is to be limited in such a way that it cannot result in local increase in pressures and in plastification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP08105797A 2008-11-14 2008-11-14 Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit Withdrawn EP2187042A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08105797A EP2187042A1 (fr) 2008-11-14 2008-11-14 Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08105797A EP2187042A1 (fr) 2008-11-14 2008-11-14 Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit

Publications (1)

Publication Number Publication Date
EP2187042A1 true EP2187042A1 (fr) 2010-05-19

Family

ID=40349992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105797A Withdrawn EP2187042A1 (fr) 2008-11-14 2008-11-14 Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit

Country Status (1)

Country Link
EP (1) EP2187042A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592260A1 (fr) * 2011-11-09 2013-05-15 Robert Bosch Gmbh Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant
CN103953482A (zh) * 2013-10-24 2014-07-30 中国船舶重工集团公司第七一一研究所 用于柴油机燃油系统的喷油器
EP2921690A1 (fr) * 2014-02-18 2015-09-23 Robert Bosch Gmbh Dispositif d'injection de carburant
RU194380U1 (ru) * 2019-08-19 2019-12-09 Общество с ограниченной ответственностью Управляющая компания "Алтайский завод прецизионных изделий" Топливная форсунка

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19523243A1 (de) * 1995-06-27 1997-01-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US20040232259A1 (en) * 2001-10-08 2004-11-25 Dieter Kienzler Fuel injector with compensation element for fuel-injection systems
WO2005045231A1 (fr) * 2003-10-09 2005-05-19 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
GB2435303A (en) * 2006-02-15 2007-08-22 Delphi Tech Inc Clamping arrangement for an i.c. engine fuel injector assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19523243A1 (de) * 1995-06-27 1997-01-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US20040232259A1 (en) * 2001-10-08 2004-11-25 Dieter Kienzler Fuel injector with compensation element for fuel-injection systems
WO2005045231A1 (fr) * 2003-10-09 2005-05-19 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
GB2435303A (en) * 2006-02-15 2007-08-22 Delphi Tech Inc Clamping arrangement for an i.c. engine fuel injector assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592260A1 (fr) * 2011-11-09 2013-05-15 Robert Bosch Gmbh Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant
CN103953482A (zh) * 2013-10-24 2014-07-30 中国船舶重工集团公司第七一一研究所 用于柴油机燃油系统的喷油器
EP2921690A1 (fr) * 2014-02-18 2015-09-23 Robert Bosch Gmbh Dispositif d'injection de carburant
EP3002447A1 (fr) * 2014-02-18 2016-04-06 Robert Bosch Gmbh Dispositif d'injection de carburant
EP3002448A1 (fr) * 2014-02-18 2016-04-06 Robert Bosch Gmbh Dispositif d'injection de carburant
RU194380U1 (ru) * 2019-08-19 2019-12-09 Общество с ограниченной ответственностью Управляющая компания "Алтайский завод прецизионных изделий" Топливная форсунка

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