EP1116879A2 - Support de ressort - Google Patents

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Publication number
EP1116879A2
EP1116879A2 EP00311690A EP00311690A EP1116879A2 EP 1116879 A2 EP1116879 A2 EP 1116879A2 EP 00311690 A EP00311690 A EP 00311690A EP 00311690 A EP00311690 A EP 00311690A EP 1116879 A2 EP1116879 A2 EP 1116879A2
Authority
EP
European Patent Office
Prior art keywords
bore
seating member
workpiece
seating
region
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Withdrawn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
EP00311690A
Other languages
German (de)
English (en)
Other versions
EP1116879A3 (fr
Inventor
Alan Conway Green
John William Stevens
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1116879A2 publication Critical patent/EP1116879A2/fr
Publication of EP1116879A3 publication Critical patent/EP1116879A3/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Withdrawn legal-status Critical Current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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to a workpiece provided with a seating member.
  • the invention relates to a part of a fuel injector, such as a nozzle body holder, provided with a seating member.
  • the invention also relates to a method of forming the workpiece.
  • Known fuel injectors of the two-stage lift type typically comprise a valve needle which is slidable within a bore provided in a nozzle body secured to a nozzle body holder.
  • the nozzle body holder is provided with a blind bore which defines a chamber, a pair of springs being housed in axial relationship within the chamber and being operable to provide a two-stage biasing force on the valve needle.
  • One of the springs remote from the valve needle engages a reaction surface disposed at the end of the chamber remote from the valve needle.
  • the other of the springs engages a reaction element located part way along the length of the chamber.
  • European Patent Application No. 0653561 describes one such arrangement in which the reaction element comprises an annular component from which extends a plurality of axially extending and angularly spaced legs. During assembly of the reaction element within the chamber, the legs are urged outwardly into firm engagement with the wall of the chamber so as to maintain the reaction element in position within the chamber, the reaction element thereby providing an adequate bearing load for the spring.
  • a problem with known arrangements of this type is that, in order to ensure the reaction element provides an adequate reaction force for the compression spring, accurate machining of the surfaces of the reaction element is required. This can require an undesirable number of processing steps.
  • the reaction element may take the form of a seating member having a surface of stepped form which is inserted into the bore of the nozzle holder body, the bore being provided with a further step with which the step in the surface of the seating member is engageable.
  • a first one of the springs is inserted into the blind end of the bore.
  • the seating member is then inserted into the bore such that the step in the surface of the seating member abuts the further step in the bore.
  • the second compression spring is then inserted into the chamber such that one end thereof abuts the seating member, abutment between the step in the surface of the seating member and the step in the bore serving to retain the seating member in position within the spring chamber so as to provide an adequate bearing load for the second spring.
  • the seating member may be retained within the bore by means of friction or staking.
  • a workpiece having a blind bore of stepped form defining a chamber within which a seating member is arranged, a region of the seating member being shaped to form an interference fit with a part of the bore, the shaped region being provided with one or more relieved sections to ease insertion of the seating member into the bore during assembly of the workpiece, cooperation between the seating member and the bore serving to retain the seating member in position within the bore.
  • the workpiece may form part of a fuel injector.
  • the workpiece may be a nozzle holder body for a nozzle body of a fuel injector.
  • the chamber may house first and second compression springs in axial relationship within the chamber and operable to provide a two-stage biasing force on a valve needle of the injector, the seating member providing a seating for a first one of the compression springs.
  • the initial insertion load required to insert the seating member into the bore is reduced such that insertion of the seating member into the bore is relatively easy. Additionally, cooperation between the seating member and the bore ensures the seating member provides an adequate reaction force or bearing load for the first spring to be seated against the seating member, in use.
  • Manufacture of the workpiece is also simplified as the step provided in the bore of the workpiece need only be of relatively small dimensions whilst still providing an adequate bearing load for the first spring.
  • the relieved sections provided on the seating member may take the form of flats extending along a part of the length of the seating member.
  • the seating member has a substantially uniform diameter along its length.
  • a method of forming a workpiece comprising the steps of;
  • the method may include the further step of monitoring the insertion load applied to the seating member as the seating member is inserted into the bore.
  • relieved section shall be taken to mean any form of flat, groove, slot, or other indentation provided on a surface.
  • FIG. 1 to 4 there is shown a part of a housing 10 forming part of a fuel injector of the two-stage lift type, the housing 10 being provided with a blind bore 12 (the blind end of which is not shown) within which a seating member 14 is arranged.
  • the bore 12 includes a first region 12 a of reduced diameter and a second region 12 b of slightly enlarged diameter, the first and second regions 12 a , 12 b being axially aligned.
  • the interconnection between the first region 12 a of the bore and the second region 12 b of the bore defines a step or shoulder 24 in the bore 12.
  • the enlarged second region 12 b of the bore has a diameter of between 0.03 and 0.3 mm greater than the diameter of the first region 12 a of the bore 12 such that the step 24 in the bore 12 is of relatively small dimension. This enables the step 24 in the bore 12 to be formed relatively easily.
  • the housing 10 may take the form of a nozzle body holder for a nozzle body of the injector.
  • the bore 12 defines first and second spring chambers 16 a ,16 b for housing first and second compression springs respectively (not shown), the springs being operable to provide a two-stage biasing force on the valve needle (not shown) of the fuel injector.
  • the first spring may act directly on the valve needle or may act on the valve needle through another component, such as a shim or other load transmitting member.
  • the valve needle is engageable with a valve needle seating, movement of the valve needle away from the seating against the action of the springs permitting fuel to be injected through one or more injector outlet openings depending on the extent of movement of the valve needle away from the seating.
  • the seating member 14 has a substantially uniform diameter, D, along its length, an end region of the seating member 14 being provided with relieved sections 18 which extend along a part of the length of the seating member 14.
  • the diameter of the first region 12 a of the bore and the diameter, D, of the seating member 14 are chosen such that the seating member 14 forms an interference fit with the first region 12 a of the bore 12.
  • the seating member 14 is also provided with an axially extending through bore 20 ( Figure 3), the through bore 20 permitting fuel within the first spring chamber 16a to escape to the second spring chamber 16 b , in use, and for receiving a push rod (not shown) which is engaged with a portion of the valve needle of the injector.
  • the seating member 14 may be provided with any number of relieved sections 18 depending on the particular requirements of the fuel injector.
  • the seating member 14 can be inserted freely up until the point at which the right hand end face of the seating member 14 aligns with the step 24 in the bore 12.
  • FIG 5 there is shown a graph to illustrate the insertion load applied to the seating member 14 during insertion of the seating member 14 as a function of the position of the seating member 14 along the axis of the bore 12. At point, X, the right hand end face of the seating member 14 is aligned with the step 24 in the bore 12.
  • the insertion load increases sharply (position Y in Figure 5) for any further displacement of the seating member 14 along the axis of the bore 12.
  • the bearing load is sufficiently high to ensure that the seating member 14 remains in a substantially fixed position within the bore 12.
  • Cooperation between the seating member 14 and the bore 12 therefore ensures that the seating member 14 provides an adequate reaction force for the spring. It will be appreciated that, the extent to which the seating member 14 is inserted into the bore beyond position Y will depend on the requirements of the particular injector.
  • the step 24 in the bore 12 need only be of relatively small dimensions, thereby simplifying manufacture whilst ensuring an adequate bearing load is provided for the spring. Additionally, as the step 24 in the bore 12 is only of relatively small size, the first and second regions 12 a ,12 b of the bore 12 are of similar diameter. This permits first and second compression springs of substantially the same size to be housed within the spring chambers 16 a ,16 b .
  • the location of the step 24 in the bore 12 and the length of the relieved sections 18 provided on the seating member 14 are chosen to ensure the seating member 14 adopts the required position within the bore 12 when the fuel injector has been assembled. Additionally, the relative diameters of the seating member 14 and the region 12 a of the bore 12 may be varied to change the characteristics of the interference fit between the seating member 14 and the first region 12 a of the bore 12. For applications in which the location of the seating member 14 within the bore 12 and the bearing load provided by the seating member 14 are particularly critical, the insertion load may be monitored whilst the seating member 14 is inserted into the bore 12. This enables the position of the seating member 14 and the bearing load to be achieved accurately.
  • the number of relieved sections 18 on the seating member 14 can be chosen to suit the particular application and bearing load required for a given injector and that the number of relieved sections 18 may be different from that shown in the accompanying drawings. It will further be appreciated that the chambers 16 a ,16 b may house other components, in addition to the compression springs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP00311690A 2000-01-14 2000-12-27 Support de ressort Withdrawn EP1116879A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0000909 2000-01-14
GB0000909A GB0000909D0 (en) 2000-01-14 2000-01-14 Workpiece

Publications (2)

Publication Number Publication Date
EP1116879A2 true EP1116879A2 (fr) 2001-07-18
EP1116879A3 EP1116879A3 (fr) 2003-10-15

Family

ID=9883743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00311690A Withdrawn EP1116879A3 (fr) 2000-01-14 2000-12-27 Support de ressort

Country Status (2)

Country Link
EP (1) EP1116879A3 (fr)
GB (1) GB0000909D0 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653561A1 (fr) 1993-11-11 1995-05-17 Lucas Industries Public Limited Company Tuyère d'injection de combustible

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5301874A (en) * 1990-05-26 1994-04-12 Robert Bosch Gmbh Adjusting sleeve for an electromagnetically actuatable valve
DE4109868A1 (de) * 1991-03-26 1992-10-01 Bosch Gmbh Robert Einstellbuchse fuer ein elektromagnetisch betaetigbares ventil und verfahren zur herstellung
DE9205975U1 (de) * 1992-05-02 1993-09-09 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE19638339B4 (de) * 1996-09-19 2008-10-02 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653561A1 (fr) 1993-11-11 1995-05-17 Lucas Industries Public Limited Company Tuyère d'injection de combustible

Also Published As

Publication number Publication date
GB0000909D0 (en) 2000-03-08
EP1116879A3 (fr) 2003-10-15

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