EP1395748A1 - Hochdruckdichtelement für injektoren - Google Patents
Hochdruckdichtelement für injektorenInfo
- Publication number
- EP1395748A1 EP1395748A1 EP02735073A EP02735073A EP1395748A1 EP 1395748 A1 EP1395748 A1 EP 1395748A1 EP 02735073 A EP02735073 A EP 02735073A EP 02735073 A EP02735073 A EP 02735073A EP 1395748 A1 EP1395748 A1 EP 1395748A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing element
- pressure chamber
- injector
- pressure
- insert part
- 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
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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/003—Valve inserts containing control chamber and valve piston
Definitions
- Injection systems with a high-pressure accumulation chamber are used today in fuel injection systems for air-compressing ner internal combustion engines.
- the fuel injection systems also include injectors for injecting fuel into the combustion chambers of the ner internal combustion engine, which have to withstand the pressures in the fuel injection system with regard to tightness and material strength.
- injectors for injecting fuel into the combustion chambers of the ner internal combustion engine, which have to withstand the pressures in the fuel injection system with regard to tightness and material strength.
- ring-shaped sealing elements are used on injectors, with which the high-pressure area of the injector is sealed off from areas of low pressure of the injector. If the pressure level in fuel injection systems is increased in order to generate a higher thef-dynamic efficiency of the ner internal combustion engine, the requirements on the sealing elements of the fuel injector also increase.
- a fuel injection valve for high pressure injection.
- a fuel injection valve which is used for high-pressure injection in self-igniting internal combustion engines and which comprises a solenoid valve for controlling the injection.
- a control circuit is provided, which is divided into a first circuit part and a second circuit part.
- the second circuit part is arranged separately on each individual injection valve from the first circuit part, which is used jointly to control a plurality of injection valves.
- the housing is clipped onto the fuel injector and fuel flows through it for cooling.
- a sealing ring made of bronze-reinforced Teflon and a metallic support ring are embedded between the housing and an insert part inserted into it below the control chamber.
- the support ring made of metallic material is required to improve the sealing effect of the bronze-reinforced Teflon ring and to prevent extrusion of the bronze-reinforced Teflon ring. Suitable measures must be taken to prevent the sealing ring on the insert from moving in the direction of the discharge throttle that relieves pressure from the control chamber. It is also the case with the previous one Solution when using the bronze-reinforced Teflon ring and the metallic support ring required to assemble them in the correct process position, which requires a considerable amount of manufacturing technology.
- the solution according to the invention compared to the solution known from the prior art, on the one hand one component can be saved and on the other hand the pressure prevailing in the pressure chamber when high pressure is applied e.g. Use via the inlet from the high-pressure collecting space (Co mon Rail) to support the sealing force of the sealing element.
- the sealing element according to the proposed invention is non-positively shrunk onto an insert part embedded in the injector housing of the fuel injector by means of a press fit, a solution is provided which is particularly simple to manufacture.
- the one-part sealing element which is preferably made of a metallic material or alloys of metallic materials, in particular does not tend to deform in such a way that it creeps into an annular gap between the insert part and a valve component which can be moved therein and hinders the smoothness of the valve component within the injector housing of the fuel injector ,
- the sealing element which can be attached to an outer surface of the insert part by means of a press fit, also represents a symmetrical, inexpensive component.
- the one-piece design of the sealing element enables uncomplicated assembly to be achieved;
- the sealing element which can be attached to the outer surface of the insert by means of a press fit, offers a sealing potential, which also withstands further pressure level increases in the fuel injector of fuel injection systems, so that the high pressure area of the pressure chamber on the fuel injector is sealed even with increasing pressures.
- the high-pressure area of the fuel injector is preferably sealed with an interference fit between the inner diameter of the sealing element and the valve element. Tappet or nozzle needle outer diameter Differences between 0.04 to 0.15 mm.
- FIG. 1 shows a longitudinal section through the components of a fuel injector and the injector housing
- FIG. 2 shows a reproduction of the detail Z from FIG. 1 on an enlarged scale.
- FIG. 1 shows a longitudinal section through the components of a fuel injector and the injector housing.
- a fuel injector 1 used in a fuel injection system for injecting fuel comprises an injector housing 2.
- the injector housing 2 of the fuel injector 1 contains a pressure chamber 3, from the pressure chamber base 5 of which a bore 6 extends through the injector housing 2.
- the bore 6 is penetrated by a rotationally symmetrical insert 7.
- the insert part 7 can transition in its axial extent from a cylindrical cross section into a frustoconically tapered shoulder. Between the circumference 8 of the insert part 7 and the wall of the bore 6 there is an annular gap 18 required for assembly reasons.
- An injection valve member 26, for example designed as a valve spool shown in FIG. 1, is accommodated within the insert part 7 shown double arrow, compare reference numeral 47, a vertical stroke movement for opening / closing injection openings, not shown in FIG. 1, on the combustion chamber end of the fuel injector 1.
- the pressure chamber 3 formed in the interior of the injector housing 2 is delimited by the wall 4 of the injector housing 2 except through the pressure chamber base 5.
- the pressure chamber 3 is connected to the high-pressure connection 22 of the high-pressure source via a high-pressure inlet 21 shown in dashed lines, which opens into the pressure chamber 3 at an outlet 20.
- the outlet point 20 of the high-pressure inlet 21 is preferably at a strength-optimized point of the wall 4 of the pressure chamber 3 in the interior of the injector housing 2.
- a sealing element 9 is received, which is pressed by the high pressure prevailing in the pressure chamber 3 onto the pressure chamber base 5 forming a support 17.
- the high pressure prevailing in the pressure chamber 3 acts on the one-piece sealing element 9 on its first annular surface 12, which ce represents the hydraulic surface effective for the hydraulic contact pressure.
- the sealing element 9 is preferably formed in one piece and has an annular shape.
- the one-piece sealing element 9 is received by a non-positive connection 14, for example a press fit, on the circumference 8 of the insert part 7.
- the press fit 14 is brought about by differences in the inside diameter of the one-piece sealing element 9 and the outside diameter of the insert part 7, which can be between 0.04 and 0.15 mm.
- the one-piece ring element which preferably consists of a metallic material or an alloy of metallic materials, can be shrunk onto the circumference 8 of the insert part 7.
- the one-piece sealing element 9 can consist, for example, of aluminum or an aluminum alloy.
- a force-locking connection in the form of a press fit 14 can be made by cold pressing the sealing element 9 made of metallic material onto the peripheral surface 8 of the insert 7.
- a corresponding radial force is established which determines the strength of the press fit 14 between the insert part 7 and the sealing element 9 formed in one piece.
- the sealing element 9 has a first annular surface 12 which faces the pressure chamber 3 and a further second annular surface which faces the pressure chamber bottom 5.
- the pressure chamber base acts as a support 17 which seals an annular gap 18 which is required between the peripheral surface 8 of the insert part 7 and the bore 6 within the injector housing 2 for assembly reasons.
- the sealing effect of the sealing element 9 is increased by the fuel pressure present in the pressure chamber 3, since the pressure prevailing in the pressure chamber 3 in the direction 19 (see illustration according to FIG. 2) acts on the sealing element 9 in the direction of the pressure chamber base 5 of the pressure chamber.
- the sealing element 9 Due to the use of a metallic material or an alloy of metallic materials in the manufacture of the sealing element, its deformation is excluded. This prevents the sealing element 9 from creeping into the annular gap 18 between the circumferential surface 8 of the insert part 7 and the bore 6 within the injector housing 2 as the service life of the fuel projector 1 increases, and leaks then occur. In addition to avoiding leaks, when using the sealing element 9 proposed according to the invention and made from a metallic material or alloys of metallic materials, the leakage losses remain limited from the pressure chamber 3 which is subjected to high pressure. From the pressure chamber 3, the fuel flowing in via the high-pressure inlet 21 and under very high pressure enters via an inlet funnel 23 and an inlet throttle 24 connected to it in the wall of the insert part 7 into a control chamber 25.
- the control chamber 25 is delimited, on the one hand, by the insert part 7 and, on the other hand, by a valve component 26 guided therein, which can be designed, for example, as a valve piston.
- a contour 26.1 can have in the end face of the valve component 26.
- a frustoconical region 26.2 can be formed on the end face of the valve component 26, which cooperates with a complementarily shaped conical region 27.1 at the outlet 27 on the outlet side of the control chamber 27.
- An outlet 27 extends from the control room 25, in which an outlet throttle 28 is accommodated.
- the outlet throttle 28, via which a pressure relief of the control chamber 25 is brought about when a closing element 29 designed here as a spherical body is actuated, is arranged at the end of the outlet 27.
- the closing element 29, which releases or closes the outlet throttle 28, is partially surrounded by a molded body 30 which is arranged on a lower end face of an armature part 31 of a magnet arrangement for actuating the fuel injector 1.
- the anchor part 31 is made in one piece and comprises a bolt part and a plate-shaped part.
- the insert part 7, which can have an upper, cylindrical part and an adjoining conically tapering part, which delimits an annular gap 18, is fixed in a stepped bore 6, 46 in the injector housing 2 by means of a fastening element 33 in the form of a clamping nut.
- the fastening screw 33 is screwed into an internal thread 45 of the injector housing 2 and bears against an upper end face 32 of the insert part 7.
- the insert part 7 is placed against the injector housing 2 above a bore 46 with a ring-shaped extension, causing a seal 34, so that the pressure chamber 3 inside the injector housing 2 is closed in a pressure-tight manner in the direction of the solenoid valve actuation arrangement.
- the armature part 31 of the actuating arrangement which is formed in one piece in the illustration according to FIG. 1, is acted upon by a spring element 35 which is guided in a sleeve.
- the sleeve surrounding the spring element 35 is surrounded by a magnetic coil 36, which in turn can be accommodated in a magnetic sleeve 37.
- An annular projection 38 is formed on the outer circumferential surface of the magnetic sleeve 37, on which a union nut 39 bears.
- the magnetic sleeve 37 is screwed onto the Throwing nut 39 with an external thread 40 on the outside of the injector housing 2 of the fuel injector 1.
- the one-piece anchor part 31 of the actuation arrangement is partially guided in an insert sleeve 41, which is fixed with the interposition of a spacer ring 42 via the magnetic sleeve 38, which in turn is fastened to the external thread 40 of the injector housing 2 via the union nut 39.
- a sealing element 43 which can be embodied as an O-ring made of elastic material is embedded.
- a bore 44 is formed in the injector housing 2 of the fuel projector as shown in FIG. 1, which is in fluid communication via a connection (not shown here) with the high-pressure connection 22 of the high-pressure source of the fuel projector 1 and a nozzle chamber, which is also not shown in FIG surrounds an injection valve member, also not shown, to which fuel under high pressure is applied.
- the injection valve member which can be designed as a nozzle needle with a combustion chamber-side seat, is actuated by a pressure relief of the control chamber 25, which is limited on the one hand by the insert part 7 fastened in the injector housing 2 by means of the fastening screw 33 and on the other hand by the valve component 26.
- the pressure relief / pressurization of the control chamber 25 takes place by actuating the solenoid valve arrangement, e.g. via the energization of the magnetic coil 36.
- FIG. 2 shows a reproduction of the detail Z according to FIG. 1 on an enlarged scale.
- the pressure chamber 3 in the injector housing 2 is delimited by a wall 4 which has a radial diameter widening in the area of the mouth 20 of the high-pressure inlet 21.
- the outlet point 20 of the high-pressure inlet 21 of the high-pressure inlet 22 (not shown in FIG. 2) preferably lies in an area of the delimiting wall 4 of the pressure chamber 3 that is optimized with regard to its pressure resistance.
- the sealing element 9 On the circumference 8 of the insert part 7, which is fixed in the injector housing 2 by means of the fastening screw 33, the sealing element 9 is fastened by a non-positive connection 14 in the form of a press fit.
- This pressurization of the sealing element 9 causes the sealing element 9 consisting of metallic or alloys of metallic materials to be pressed against the pressure chamber base 5, ie an increase in the sealing force between the insert part 7 and the injector housing 2 is favorable.
- the outer diameter of the sealing element 9 is identified by reference numeral 10, while the inner diameter 11, which brings about the non-positive connection 14 in the form of a press fit with the outer diameter of the insert part 7, and lies opposite the outer diameter 10.
- Chamfers 15 and 16 can be formed on the preferably annular sealing element 9 for sealing the annular gap 18 between the insert 7 and the bore 6 within the injector housing 2.
- the sealing of the pressure chamber 3 to the annular gap 18 between the insert 7 and the bore 6 within the injector housing 2 takes place via the sealing element 9 made of metallic material or alloys of metallic materials, the sealing of the pressure chamber 3 on its upper side is achieved by the contact of the insert 7 on the injector housing 2 reached on the contact surface 34.
- the insert part 7 is fixed within the injector housing 2 in a stepped Bo nmg 6, 46 by a fastening screw 33.
- the external thread of the fastening screw 33 interacts with an internal thread 45 formed in the interior of the injector housing 2, so that the insert part 7 can be fixed in the injector housing 2 with a defined pretensioning force.
- the upper region of the pressure chamber 3 is sealed, which merges into the bore section 46 of the stepped bore 6, 46.
- valve component 26 the end face of which delimits the control chamber 25 within the insert part 7 can be shaped, that the end face of the valve component 26 has a truncated cone-shaped area 26.2 which projects with a complementary drain cone 27 of the drain 27.
- One or more annular grooves, as shown in FIG. 2 can be formed on the outer peripheral surface of the valve component 26.
- the solution according to the invention avoids targeted adjustments with regard to a possible pressure increase for further fuel injector generations in which higher pressures can be realized. build below the sealing ring.
- the solution according to the invention it is possible to prevent the sealing element 9 from migrating upwards and to prevent the sealing element 9 from extruding into the gap 18 by suitable choice of material.
- the solution proposed according to the invention offers a one-piece, inexpensive and easy-to-install symmetrical sealing element 9.
- this is advantageously arranged such that it is acted upon by the high fuel pressure prevailing in the pressure chamber 3, which in addition to the formation of the non-positive connection 14 on the circumference of the insert part 7 to increase the sealing force in the area of the pressure chamber base 7, which forms the support 17 for the sealing element 9.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10124602 | 2001-05-21 | ||
DE10124602 | 2001-05-21 | ||
DE10220457 | 2002-05-07 | ||
DE10220457A DE10220457A1 (de) | 2001-05-21 | 2002-05-07 | Hochdruckdichtelement für Injektoren |
PCT/DE2002/001841 WO2002095217A1 (de) | 2001-05-21 | 2002-05-21 | Hochdruckdichtelement für injektoren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1395748A1 true EP1395748A1 (de) | 2004-03-10 |
EP1395748B1 EP1395748B1 (de) | 2005-05-18 |
Family
ID=26009348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02735073A Expired - Lifetime EP1395748B1 (de) | 2001-05-21 | 2002-05-21 | Hochdruckdichtelement für injektoren |
Country Status (4)
Country | Link |
---|---|
US (1) | US6845756B2 (de) |
EP (1) | EP1395748B1 (de) |
JP (1) | JP4181419B2 (de) |
WO (1) | WO2002095217A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1710429A1 (de) * | 2005-04-07 | 2006-10-11 | Robert Bosch Gmbh | Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
WO2006131411A1 (de) * | 2005-06-09 | 2006-12-14 | Robert Bosch Gmbh | Ventil zur steuerung eines einspritzventils einer brennkraftmaschine |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10259950A1 (de) * | 2002-12-20 | 2004-07-01 | Robert Bosch Gmbh | Steuerventil für Injektoren, insbesondere Common-Rail-Injektoren von Brennkraftmaschinen |
DE102004015133A1 (de) * | 2003-11-03 | 2005-06-02 | Robert Bosch Gmbh | Injektor |
JP2005248847A (ja) * | 2004-03-04 | 2005-09-15 | Bosch Automotive Systems Corp | 燃料通路のシール構造及びそのシール構造を備えた燃料噴射弁 |
JP2005248846A (ja) * | 2004-03-04 | 2005-09-15 | Bosch Automotive Systems Corp | 燃料通路のシール構造及びそのシール構造を備えた燃料噴射弁 |
DE102004024527A1 (de) * | 2004-05-18 | 2005-12-15 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung |
DE602004004254T2 (de) * | 2004-06-30 | 2007-07-12 | C.R.F. S.C.P.A. | Servoventil zum Steuern eines Einspritzventils einer Brennkraftmaschine |
WO2006042488A1 (de) * | 2004-10-21 | 2006-04-27 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102005015735A1 (de) * | 2005-04-06 | 2006-10-12 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
CN100412353C (zh) * | 2006-08-02 | 2008-08-20 | 北京理工大学 | 一种高压共轨电控喷油器密封装置 |
US7866575B2 (en) * | 2009-01-12 | 2011-01-11 | GM Global Technology Operations LLC | Pressure actuated fuel injector |
TR201108147A2 (tr) * | 2011-08-16 | 2013-01-21 | Robert Bosch Gmbh | Etkin sızdırmazlık özelliğine sahip bir enjeksiyon valfı. |
JP6829003B2 (ja) * | 2015-04-28 | 2021-02-10 | マグネティ マレッリ ソチエタ ペル アツィオニ | 入口弁の良好な液圧シールを備える直接噴射システム用の燃料ポンプ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1232026B (it) * | 1989-02-28 | 1992-01-23 | Weber Srl | Dispositivo di iniezione del combustibile ad azionamento elettromagne tico per motori a ciclo diesel |
IT220661Z2 (it) * | 1990-10-31 | 1993-10-08 | Elasis Sistema Ricerca Fita Nel Mezzogiorno Soc.Consortile P.A. | Perfezionamenti al sistema di tenuta ad alta pressione della valvola pilota di un iniettore elettromagnetico per sistemi di iniezione del combustibile di motori a combustione interna |
IT1293434B1 (it) * | 1997-07-11 | 1999-03-01 | Elasis Sistema Ricerca Fiat | Dispositivo di tenuta tra due vani soggetti a pressioni diverse, ad esempio in un inietttore di combustibile per motori a comustione |
DE19802244A1 (de) * | 1998-01-22 | 1999-07-29 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
-
2002
- 2002-05-21 EP EP02735073A patent/EP1395748B1/de not_active Expired - Lifetime
- 2002-05-21 US US10/333,357 patent/US6845756B2/en not_active Expired - Fee Related
- 2002-05-21 JP JP2002591658A patent/JP4181419B2/ja not_active Expired - Fee Related
- 2002-05-21 WO PCT/DE2002/001841 patent/WO2002095217A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO02095217A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1710429A1 (de) * | 2005-04-07 | 2006-10-11 | Robert Bosch Gmbh | Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
WO2006131411A1 (de) * | 2005-06-09 | 2006-12-14 | Robert Bosch Gmbh | Ventil zur steuerung eines einspritzventils einer brennkraftmaschine |
Also Published As
Publication number | Publication date |
---|---|
JP2004519620A (ja) | 2004-07-02 |
EP1395748B1 (de) | 2005-05-18 |
US20040021011A1 (en) | 2004-02-05 |
US6845756B2 (en) | 2005-01-25 |
JP4181419B2 (ja) | 2008-11-12 |
WO2002095217A1 (de) | 2002-11-28 |
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