EP2126331A1 - Kraftstoffeinspritzventil zur kraftstoffeinspritzung in brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil zur kraftstoffeinspritzung in brennkraftmaschinenInfo
- Publication number
- EP2126331A1 EP2126331A1 EP08708545A EP08708545A EP2126331A1 EP 2126331 A1 EP2126331 A1 EP 2126331A1 EP 08708545 A EP08708545 A EP 08708545A EP 08708545 A EP08708545 A EP 08708545A EP 2126331 A1 EP2126331 A1 EP 2126331A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- sealing ring
- injection valve
- peek
- valve according
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 56
- 238000002347 injection Methods 0.000 title claims abstract description 42
- 239000007924 injection Substances 0.000 title claims abstract description 42
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 60
- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 28
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 28
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims 1
- 239000011796 hollow space material Substances 0.000 abstract 3
- 239000000835 fiber Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
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
- 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
- F02M2200/16—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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9015—Elastomeric or plastic materials
-
- 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
- the invention relates to a fuel injection valve, as is the case for the injection of
- Fuel is used in combustion chambers of internal combustion engines, preferably of self-igniting internal combustion engines.
- a fuel injection valve of the generic type is known for example from the published patent application DE 198 27 267 A1.
- Such a fuel injection valve has a housing in which a control chamber is formed, wherein the fuel injection takes place depending on the pressure in the control chamber. In this case, this is done by a piston rod defining the control space and the piston rod acting directly on a valve needle, which in turn closes or releases injection ports through which the fuel supplied to the fuel injection valve under high pressure is ejected.
- the control chamber is located in a valve piece, which in turn is arranged in a cavity of the housing and which limits the control chamber radially outward.
- the high-pressure fuel is supplied to the control chamber via a high-pressure passage, which opens into an annular space which is formed between the valve piece and the wall of the cavity.
- a high-pressure passage which opens into an annular space which is formed between the valve piece and the wall of the cavity.
- One or more throttle bores lead from this annular space into the control chamber and connect the control chamber with the high fuel pressure in the annular space.
- a sealing ring is provided between the valve piece and the wall of the cavity on the side facing the valve needle, so that the high fuel pressure in the annulus of Niederbuchbe- rich of the fuel injector remains disconnected.
- the sealing ring is exposed to high mechanical stresses due to the high fuel pressure in the annulus.
- a sealing ring which is made for example of rubber or a similar sealing material, through the gap, which remains the valve needle facing between the wall of the cavity and the valve piece, as it is extruded and can no longer fulfill its sealing function , As a result, this leads to an excessive amount of leakage of the fuel injection valve and thus eventually to a failure of the engine.
- the fuel injection valve according to the invention for fuel injection has the advantage that sealing of the annular space against the low-pressure region of the fuel injection valve on the side of the annular space facing the valve needle always takes place reliably.
- a sealing ring is provided, which consists of polyetheretherketone (PEEK), a thermoplastic polymer.
- PEEK has all the properties required for good high-pressure fuel sealing: PEEK has high chemical resistance and is not attacked by the fuel.
- PEEK has the property of being stiffened by the high pressure of up to 2000 bar prevailing in the fuel injector so that extrusion into the gap between the valve member and the wall of the cavity is precluded , Since the sealing ring is made only in one piece, no pressure cushion can build up below the sealing ring, which shifts the sealing ring in the direction of the control chamber, as is the case with the two-part solution.
- the sealing ring may have different cross-sectional shapes depending on the given requirements. As a particularly advantageous form has proven that provides a substantially rectangular cross section of the sealing ring, wherein the outer edges are chamfered. However, other shapes may also be advantageous depending on the given geometries, for example a circular or elliptical cross-sectional shape or a rectangular one.
- the PEEK is reinforced with glass fibers or carbon fibers. This is a gain either with long fibers that run, for example, in the circumferential direction around the entire sealing ring, or by short fibers in question, the short fibers have only a short length compared to the diameter of the sealing ring and are arranged irregularly within the plastic.
- the production is particularly advantageous with a method according to the invention, in which the sealing ring of a solid PEEK block or of PEEK semi-finished is made by turning. This turning process produces an exact rotational symmetry and correspondingly smooth surfaces, which are essential for the function of the sealing ring.
- FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention, only the essential part being shown
- FIG. 2 shows an enlargement of FIG. 1 in the region of the sealing ring
- FIG. 3a shows a perspective view of the sealing ring, the cross section of which is shown in FIG. 3b
- FIGS. 3c, 3d and 3e each show different embodiments of the sealing ring with different cross sections. Description of the embodiment
- FIG. 1 shows a fuel injection valve according to the invention is shown in longitudinal section, wherein only the combustion chamber remote from the fuel injection valve is shown. The remaining part, which is well known, for example from DE 198 27 267 Al, has been omitted for clarity.
- the fuel injection valve has a housing 1, which includes a
- Valve body 4 includes.
- the valve body 4 is connected via a connecting piece 9 with a high-pressure source, for example a so-called rail, which in turn is always filled via a high-pressure pump with fuel under high pressure.
- the fuel is introduced at the connecting piece 9 through the connection opening 3 and passes through a filter 42, wherein the sealing of the connecting piece 9, which is screwed into the valve body 4, is achieved by a seal 41.
- Within the valve body 4 extends a high pressure passage 8, through which the fuel, which is filled via the connecting piece 9, is directed to the injection nozzle and from there ultimately injected into the combustion chamber of the internal combustion engine.
- a cavity 5 is formed, which extends over the entire length of the valve body 4.
- a valve member 12 is arranged, which is formed metric tessssssym metric, wherein between the wall of the cavity 5 and the valve member 12 an annular space 20 remains, into which a branch of the high-pressure channel 8 opens , which is formed in direct extension of the connecting piece 9. From the annular space 20, one or more throttle bores go into a control chamber 14, which is bounded by the valve member 12 radially outward.
- a piston rod 6 is guided radially, which is arranged longitudinally displaceable in the cavity 5 and which faces away from the control chamber with its end on a valve needle, not shown in the drawing, which opens and closes the injection openings of the fuel injection valve.
- a drain hole 17 is formed, which is formed centrally in the longitudinal direction and which merges at its controlraumabgewandten end into an outlet throttle 18, so that a hydraulic connection from the control room
- leakage oil chamber 19 is connected via the leak oil passage 10 with a return system and always at low
- a control valve 30 which comprises a magnet armature 27, which can be moved by an electromagnet 21 against a closing spring 31 in the longitudinal direction.
- a sealing ball 25 is arranged on the armature 27 which, in the closed position of the control valve 30, is seated on a sealing seat 24 on the valve piece 12 and thus closes the outlet throttle 18. If the outlet throttle 18 is to be opened, the electromagnet 21 is energized and pulls the armature 27 away from the sealing seat 24, so that the outlet throttle 18 clears the connection between the control chamber 14 and the leakage oil chamber 19.
- FIG. 2 the area of the sealing ring 40 is shown enlarged again.
- the annular space 20 is the control chamber 14 facing away from sealed by a sealing ring 40 against the gap 15 which is formed between the valve member 12 and the wall of the cavity 5.
- the gap 15 is in this case via a drainage channel
- Sealing ring 40 is exposed to high mechanical loads.
- the sealing ring 40 must on the one hand be sufficiently mechanically stable so as not to enter the gap
- the sealing ring 40 is made of polyetheretherketone (PEEK), care being taken that the sealing ring 40 on the one hand does not sit too tightly on the valve piece 12 and, on the other hand, does not leave too large a gap between the sealing ring 40 and the valve piece 12 on the one hand and the sealing ring 40 and the wall of the cavity 5 on the other hand occurs.
- PEEK polyetheretherketone
- FIG 3a the sealing ring 40 is shown again in perspective and Figure 3b shows the corresponding cross section through the sealing ring 40.
- the cross section of the sealing ring 40 is substantially rectangular, wherein the outer edges are bevelled. This form has proved to be particularly advantageous for sealing in the fuel injection valve according to the invention.
- other cross sections are conceivable, for example, an octagonal
- Cross section as shown in Figure 3c, a substantially semicircular cross section, as shown in Figure 3d, or a round or elliptical cross section, as shown in Figure 3e.
- the PEEK used of the sealing ring 40 may also be reinforced by fibers, in particular by glass or carbon fibers. This is a gain either by long fibers in question, which preferably extend in the circumferential direction of the sealing ring 40, or by short fibers whose length is small compared to the diameter of the sealing ring 40.
- the short fibers are arranged undirected in the PEEK and ensure a higher stability of the sealing ring 40.
- Another way to strengthen the PEEK of the sealing ring 40 is the addition of PTFE powder (polytetrafluoroethylene) or graphite powder into the PEEK material.
- PTFE powder polytetrafluoroethylene
- graphite powder into the PEEK material.
- the sealing ring 40 must have exact dimensions in order to fulfill the desired properties. This makes the production by the cost-effective
- the sealing ring 40 is produced in an advantageous method by turning either from a solid PEEK block or from PEEK semifinished product, for example a tube. This can be done accordingly achieve exact dimensions with a good surface quality of the sealing ring 40.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710008262 DE102007008262A1 (de) | 2007-02-20 | 2007-02-20 | Kraftstoffeinspritzventil zur Kraftstoffeinspritzung in Brennkraftmaschinen |
PCT/EP2008/051235 WO2008101782A1 (de) | 2007-02-20 | 2008-02-01 | Kraftstoffeinspritzventil zur kraftstoffeinspritzung in brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2126331A1 true EP2126331A1 (de) | 2009-12-02 |
EP2126331B1 EP2126331B1 (de) | 2013-07-31 |
Family
ID=39281870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708545.2A Active EP2126331B1 (de) | 2007-02-20 | 2008-02-01 | Kraftstoffeinspritzventil zur kraftstoffeinspritzung in brennkraftmaschinen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2126331B1 (de) |
DE (1) | DE102007008262A1 (de) |
WO (1) | WO2008101782A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212249A1 (de) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE102019220061A1 (de) | 2019-12-18 | 2021-06-24 | Robert Bosch Gmbh | Kraftstoffinjektor zur Einspritzung von Kraftstoff |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19905721A1 (de) * | 1998-02-24 | 1999-08-26 | Hoerbiger Ventilwerke Gmbh | Gasventil |
DE19827267A1 (de) | 1998-06-18 | 1999-12-23 | Bosch Gmbh Robert | Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr |
GB9823028D0 (en) * | 1998-10-22 | 1998-12-16 | Lucas Ind Plc | Fuel injector |
DE19951144A1 (de) * | 1999-10-23 | 2001-04-26 | Bosch Gmbh Robert | Injektor für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen mit hydraulischer Vorspannung des Druckübersetzers |
DE10020870A1 (de) | 2000-04-28 | 2001-10-31 | Bosch Gmbh Robert | Common-Rail-Injektor |
DE102005026513A1 (de) * | 2005-06-09 | 2006-12-14 | Robert Bosch Gmbh | Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
-
2007
- 2007-02-20 DE DE200710008262 patent/DE102007008262A1/de not_active Withdrawn
-
2008
- 2008-02-01 EP EP08708545.2A patent/EP2126331B1/de active Active
- 2008-02-01 WO PCT/EP2008/051235 patent/WO2008101782A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008101782A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007008262A1 (de) | 2008-08-21 |
EP2126331B1 (de) | 2013-07-31 |
WO2008101782A1 (de) | 2008-08-28 |
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