EP0653561A1 - Fuel injection nozzle - Google Patents
Fuel injection nozzle Download PDFInfo
- Publication number
- EP0653561A1 EP0653561A1 EP94307792A EP94307792A EP0653561A1 EP 0653561 A1 EP0653561 A1 EP 0653561A1 EP 94307792 A EP94307792 A EP 94307792A EP 94307792 A EP94307792 A EP 94307792A EP 0653561 A1 EP0653561 A1 EP 0653561A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- plug
- nozzle
- component
- springs
- 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
Links
Images
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
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with 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
Definitions
- This invention relates to fuel injection nozzles of the kind comprising a nozzle holder to one end of which is secured a nozzle body containing a fuel pressure actuated valve member which controls the flow of fuel through an outlet, a chamber defined in the holder and a pair of springs located in axial relationship within the chamber and operable to provide a two stage biasing force on the valve member, the one of said springs remote from the nozzle body engaging a reaction surface disposed at the end of the chamber remote from the nozzle body and the other of the springs engaging a reaction element located intermediate the ends of the chamber.
- reaction element could be in the form of a step in the wall of the chamber but this would result in the nozzle holder having an increased diameter as a result of the provision of the step.
- the method of securing the annular member is to deform the wall of the chamber by pressure applied to the exterior surface of the nozzle holder. This method of retention requires the appropriate material to be used in the manufacture of the nozzle holder and this material may not be ideal to withstand the stresses to which the holder is subjected in use.
- the reaction element has been secured it is no longer possible to gain access to the one spring for the purpose of adjustment.
- the object of the present invention is to provide a fuel injection nozzle of the kind specified in a simple and improved form.
- the nozzle comprises a generally cylindrical nozzle holder 10 to one end of which is secured a nozzle body 11 using a conventional cap nut 12.
- the nozzle body contains a fluid pressure actuated valve member 13 which controls the flow of fuel through an outlet orifice 14 formed in an extended portion of the nozzle body.
- a seating and the valve member 13 is biased into engagement with the seating by a first coiled compression spring 15 which is housed within a cylindrical chamber 16 formed in the nozzle holder 10 and extending inwardly from the end thereof engaged with the nozzle body.
- the chamber 16 communicates with a drain outlet 17 formed in the holder and also formed in the holder is a fuel inlet 18 which is connected by means of a passage 19 extending within the holder to a further passage 20 formed in the nozzle body, the passage 20 communicating with a gallery through which the valve member extends.
- the spring 15 has one end engaged with a spring abutment 21 and its other end is engaged with the end wall of the chamber through the intermediary of a shim 22.
- the force exerted by the spring 15 is transmitted to the valve member 13 by way of the spring abutment 21 and then by means of a push rod 23 which is engaged with a reduced end portion of the valve member 13 which projects from the nozzle body 11.
- a further spring 24 Surrounding the push rod is a further spring 24 one end of which is engaged with an abutment plate 25. The other end of the spring is engaged with a reaction element 26 to be described.
- the initial force exerted on the valve member by the spring 15 is determined by selection of the shim 22 and once the shim is selected the reaction element 26 is placed in position and locked against axial movement.
- the force exerted by the spring 24 is adjusted again by the use of a shim which is interposed between the reaction element and the end of the spring remote from the abutment plate.
- Figure 2 shows to an enlarged scale, the construction of the reaction element and with reference to Figures 2, 3 and 4 the reaction element comprises an annular component 30 from which extends a plurality of axially extending and angularly spaced legs 31 the outer surfaces of which are provided with grooves. At their outer ends the inner surfaces of the legs are tapered outwardly and the radially inward surfaces of the legs are provided with thread formations.
- the reaction element also includes a plug 32 having a central bore of non-circular section which is large enough to allow the passage therethrough of the push rod 23.
- the plug 32 is also provided with a tapered portion for engagement with the tapered surfaces of the legs 31.
- the plug When assembling the reaction element the plug is loosely engaged with the threaded portions of the legs and then pushed into position in the chamber.
- a tool which is located in a slot 33 formed in the end surface of the component 30, the latter can be restrained from rotation and by use of an appropriately shaped driver engaged within the non-circular bore in the plug, the plug 32 can be rotated to urge the legs 31 outwardly into firm engagement with the wall of the chamber. Should it be necessary to remove the component this can be readily effected by unscrewing the plug and withdrawing the reaction element.
- the tapered portions on the legs and plug are omitted and the plug and legs are formed with a tapered screw thread which as the plug is rotated relative to the component forces the legs outwardly.
- the plug 35 is engaged within the component 36 from the opposite end so that the direction of the tapered portions on the plug and the legs 37 is reversed.
- the curved surfaces of the legs 37 which engage with the wall of the chamber lie in their free state, on a circle which is slightly larger than the diameter of the chamber 16 so that when the component 36 is pushed into position the legs are deformed inwardly by a small amount so that a light force is required to move the reaction member into position.
- the plug is rotated relative to the component to urge the legs outwardly into firm engagement with the wall of the chamber.
- the initial frictional engagement between the legs 37 and the wall of the chamber should be sufficient to restrain the component against rotation.
- a slot similar to the slot 33 may be provided.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- This invention relates to fuel injection nozzles of the kind comprising a nozzle holder to one end of which is secured a nozzle body containing a fuel pressure actuated valve member which controls the flow of fuel through an outlet, a chamber defined in the holder and a pair of springs located in axial relationship within the chamber and operable to provide a two stage biasing force on the valve member, the one of said springs remote from the nozzle body engaging a reaction surface disposed at the end of the chamber remote from the nozzle body and the other of the springs engaging a reaction element located intermediate the ends of the chamber.
- The aforesaid reaction element could be in the form of a step in the wall of the chamber but this would result in the nozzle holder having an increased diameter as a result of the provision of the step. It is known from GB-A-2251851 to form the reaction element as an annular member which is secured in position in the chamber after the one of the springs has been assembled into the chamber. The method of securing the annular member is to deform the wall of the chamber by pressure applied to the exterior surface of the nozzle holder. This method of retention requires the appropriate material to be used in the manufacture of the nozzle holder and this material may not be ideal to withstand the stresses to which the holder is subjected in use. Moreover, once the reaction element has been secured it is no longer possible to gain access to the one spring for the purpose of adjustment.
- The object of the present invention is to provide a fuel injection nozzle of the kind specified in a simple and improved form.
- According to the invention said reaction element comprises an annular component which can be inserted into the chamber to the desired position and a plug which can be screw threadedly engaged with the component to effect expansion of the component into gripping engagement with the interior wall of the chamber.
- An example of a fuel injection nozzle in accordance with the invention will now be described with reference to the accompanying drawings in which:-
- Figure 1 is a sectional side elevation of the nozzle,
- Figure 2 is a view to an enlarged scale of portion of the nozzle seen in Figure 1,
- Figure 3 is a plan view of the portion of the nozzle seen in Figure 2,
- Figure 4 is an underside view of the portion of the nozzle seen in Figure 2, and
- Figures 5 and 6 are views similar to Figures 2 and 3 showing a modification.
- Referring to Figure 1 of the drawings the nozzle comprises a generally
cylindrical nozzle holder 10 to one end of which is secured anozzle body 11 using aconventional cap nut 12. The nozzle body contains a fluid pressure actuatedvalve member 13 which controls the flow of fuel through anoutlet orifice 14 formed in an extended portion of the nozzle body. - Within the nozzle body there is defined a seating and the
valve member 13 is biased into engagement with the seating by a first coiledcompression spring 15 which is housed within acylindrical chamber 16 formed in thenozzle holder 10 and extending inwardly from the end thereof engaged with the nozzle body. Thechamber 16 communicates with adrain outlet 17 formed in the holder and also formed in the holder is afuel inlet 18 which is connected by means of apassage 19 extending within the holder to afurther passage 20 formed in the nozzle body, thepassage 20 communicating with a gallery through which the valve member extends. - The
spring 15 has one end engaged with aspring abutment 21 and its other end is engaged with the end wall of the chamber through the intermediary of ashim 22. - The force exerted by the
spring 15 is transmitted to thevalve member 13 by way of thespring abutment 21 and then by means of apush rod 23 which is engaged with a reduced end portion of thevalve member 13 which projects from thenozzle body 11. - Surrounding the push rod is a
further spring 24 one end of which is engaged with anabutment plate 25. The other end of the spring is engaged with areaction element 26 to be described. - The
abutment plate 25 is of generally triangular shape and it is urged by thespring 24 into engagement with the end face of thenozzle body 11. A small clearance exists between the plate and a step defined on the valve member and a further small clearance exists between the plate and threestop surfaces 27 which are defined adjacent the entrance to the chamber. In operation, when fuel under pressure is supplied through theinlet 18 the fuel pressure acts upon the valve member to generate an axial force which is opposed by thespring 15. When the pressure rises to a sufficiently high value the force exerted by thespring 15 is overcome and the valve member lifts until the aforesaid step on the valve member engages with theabutment plate 25. The limited lift of the valve member allows fuel to flow through theoutlet orifice 14 at a restricted rate. As the fuel pressure increases the valve member moves further but in this case it is against the action of both springs and the maximum extent of movement of the valve member is limited by the abutment of theplate 25 with thestop surfaces 27. - The initial force exerted on the valve member by the
spring 15 is determined by selection of theshim 22 and once the shim is selected thereaction element 26 is placed in position and locked against axial movement. The force exerted by thespring 24 is adjusted again by the use of a shim which is interposed between the reaction element and the end of the spring remote from the abutment plate. - Figure 2 shows to an enlarged scale, the construction of the reaction element and with reference to Figures 2, 3 and 4 the reaction element comprises an
annular component 30 from which extends a plurality of axially extending and angularlyspaced legs 31 the outer surfaces of which are provided with grooves. At their outer ends the inner surfaces of the legs are tapered outwardly and the radially inward surfaces of the legs are provided with thread formations. The reaction element also includes aplug 32 having a central bore of non-circular section which is large enough to allow the passage therethrough of thepush rod 23. Theplug 32 is also provided with a tapered portion for engagement with the tapered surfaces of thelegs 31. When assembling the reaction element the plug is loosely engaged with the threaded portions of the legs and then pushed into position in the chamber. By use of a tool which is located in aslot 33 formed in the end surface of thecomponent 30, the latter can be restrained from rotation and by use of an appropriately shaped driver engaged within the non-circular bore in the plug, theplug 32 can be rotated to urge thelegs 31 outwardly into firm engagement with the wall of the chamber. Should it be necessary to remove the component this can be readily effected by unscrewing the plug and withdrawing the reaction element. In a modification, the tapered portions on the legs and plug are omitted and the plug and legs are formed with a tapered screw thread which as the plug is rotated relative to the component forces the legs outwardly. - In the arrangement shown in Figures 5 and 6, the
plug 35 is engaged within thecomponent 36 from the opposite end so that the direction of the tapered portions on the plug and thelegs 37 is reversed. Moreover, the curved surfaces of thelegs 37 which engage with the wall of the chamber lie in their free state, on a circle which is slightly larger than the diameter of thechamber 16 so that when thecomponent 36 is pushed into position the legs are deformed inwardly by a small amount so that a light force is required to move the reaction member into position. Once the desired position is reached the plug is rotated relative to the component to urge the legs outwardly into firm engagement with the wall of the chamber. In this example the initial frictional engagement between thelegs 37 and the wall of the chamber should be sufficient to restrain the component against rotation. However, if desired a slot similar to theslot 33 may be provided. - As with the previous example by providing tapered threads, on the legs and the plug it is possible to eliminate the aforesaid tapered portions.
Claims (6)
- A fuel injection nozzle comprising a nozzle holder (10) to one end of which is secured a nozzle body (11) containing a fuel pressure actuated valve member (13) which controls the flow of fuel through an outlet (14), a chamber (16) defined in the holder and a pair of springs (15, 24) located in axial relationship within the chamber, the springs providing a two stage biasing force for the valve member (13), the one of the springs remote from the nozzle body (11) engaging a reaction surface disposed at the end of the chamber remote from the nozzle body, and the other of the springs engaging a reaction element (26) located intermediate the ends of the chamber (16) characterised in that said reaction element comprises an annular component (30, 36) which can be inserted into the chamber to the desired position and a plug (32, 35) which can be screw threadedly engaged with the component to effect expansion of the component into gripping engagement with the interior wall of the chamber.
- A nozzle according to Claim 1, characterised in that said plug (32, 35) is provided with a through bore to allow a push rod (23) to pass therethrough, said push rod acting to transmit the force exerted by said one spring.
- A nozzle according to Claim 2, characterised in that said through bore is of non-circular section.
- A nozzle according to Claim 2 or Claim 3, characterised in that said annular component defines a plurality of axially extending and angularly spaced legs (31, 37) which are urged outwardly into gripping engagement with the wall of the chamber upon tightening of the plug within the annular component.
- A nozzle according to Claim 4, characterised in that said plug (32, 35) and said legs (31, 37) are provided with cooperating tapered surfaces which co-act to urge the legs outwardly as the plug is tightened.
- A nozzle according to Claim 4, characterised in that the plug and component are provided with tapered screw threads.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939323236A GB9323236D0 (en) | 1993-11-11 | 1993-11-11 | Fuel injection nozzle |
GB9323236 | 1993-11-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0653561A1 true EP0653561A1 (en) | 1995-05-17 |
EP0653561B1 EP0653561B1 (en) | 1998-08-12 |
Family
ID=10744979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94307792A Expired - Lifetime EP0653561B1 (en) | 1993-11-11 | 1994-10-24 | Fuel injection nozzle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0653561B1 (en) |
DE (1) | DE69412427T2 (en) |
ES (1) | ES2119971T3 (en) |
GB (1) | GB9323236D0 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0984159A2 (en) * | 1998-08-31 | 2000-03-08 | Siemens Aktiengesellschaft | Fuel injector with stroke limitation |
EP1116879A2 (en) | 2000-01-14 | 2001-07-18 | Delphi Technologies, Inc. | Spring seat |
AT511801B1 (en) * | 2012-02-07 | 2013-03-15 | Bosch Gmbh Robert | METHOD FOR INFLUENCING THE THREADED GEOMETRY OF AN INTERNAL THREAD FOR INTERNAL COMBUSTION ENGINES |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB924951A (en) * | 1961-06-12 | 1963-05-01 | Cav Ltd | Fuel injection nozzle units |
WO1990005844A1 (en) * | 1988-11-18 | 1990-05-31 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
EP0441094A1 (en) * | 1988-09-09 | 1991-08-14 | Stanadyne Automotive Corp. | Fuel injection nozzle |
GB2251891A (en) * | 1991-01-17 | 1992-07-22 | Bosch Gmbh Robert | Fuel-injection nozzle for internal-combustion engines |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU947461A1 (en) * | 1980-11-24 | 1982-07-30 | Ярославский завод дизельной аппаратуры | Nozzle for fuel feed into diesel |
-
1993
- 1993-11-11 GB GB939323236A patent/GB9323236D0/en active Pending
-
1994
- 1994-10-24 EP EP94307792A patent/EP0653561B1/en not_active Expired - Lifetime
- 1994-10-24 DE DE1994612427 patent/DE69412427T2/en not_active Expired - Lifetime
- 1994-10-24 ES ES94307792T patent/ES2119971T3/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB924951A (en) * | 1961-06-12 | 1963-05-01 | Cav Ltd | Fuel injection nozzle units |
EP0441094A1 (en) * | 1988-09-09 | 1991-08-14 | Stanadyne Automotive Corp. | Fuel injection nozzle |
WO1990005844A1 (en) * | 1988-11-18 | 1990-05-31 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
GB2251891A (en) * | 1991-01-17 | 1992-07-22 | Bosch Gmbh Robert | Fuel-injection nozzle for internal-combustion engines |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0984159A2 (en) * | 1998-08-31 | 2000-03-08 | Siemens Aktiengesellschaft | Fuel injector with stroke limitation |
EP0984159A3 (en) * | 1998-08-31 | 2003-01-29 | Siemens Aktiengesellschaft | Fuel injector with stroke limitation |
EP1116879A2 (en) | 2000-01-14 | 2001-07-18 | Delphi Technologies, Inc. | Spring seat |
EP1116879A3 (en) * | 2000-01-14 | 2003-10-15 | Delphi Technologies, Inc. | Spring seat |
AT511801B1 (en) * | 2012-02-07 | 2013-03-15 | Bosch Gmbh Robert | METHOD FOR INFLUENCING THE THREADED GEOMETRY OF AN INTERNAL THREAD FOR INTERNAL COMBUSTION ENGINES |
AT511801A4 (en) * | 2012-02-07 | 2013-03-15 | Bosch Gmbh Robert | METHOD FOR INFLUENCING THE THREADED GEOMETRY OF AN INTERNAL THREAD FOR INTERNAL COMBUSTION ENGINES |
US9765910B2 (en) | 2012-02-07 | 2017-09-19 | Robert Bosch Gmbh | Method for influencing the thread geometry of an internal thread for internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
EP0653561B1 (en) | 1998-08-12 |
GB9323236D0 (en) | 1994-01-05 |
ES2119971T3 (en) | 1998-10-16 |
DE69412427D1 (en) | 1998-09-17 |
DE69412427T2 (en) | 1999-02-18 |
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