EP1413743B1 - Nozzle for a fuel injector - Google Patents
Nozzle for a fuel injector Download PDFInfo
- Publication number
- EP1413743B1 EP1413743B1 EP20020023553 EP02023553A EP1413743B1 EP 1413743 B1 EP1413743 B1 EP 1413743B1 EP 20020023553 EP20020023553 EP 20020023553 EP 02023553 A EP02023553 A EP 02023553A EP 1413743 B1 EP1413743 B1 EP 1413743B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- needle
- face
- ring plate
- sleeve
- 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.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims description 45
- 238000013016 damping Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, 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
- F02M2200/16—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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
Definitions
- the ring plate is arranged on an upper end surface of the nozzle.
- the upper end surface is directed towards the housing and the ring plate is pressed against the upper end surface by a holding element. This arrangement of the ring plate is advantageous for mounting the ring plate.
- the sleeve comprises a first cylindrical part that surrounds the ring nut.
- the first cylindrical part merges with a second cylindrical part by means of a step face.
- the second cylindrical part has a smaller diameter than the first part.
- the step face is adjacent to an upper plane of the ring plate and presses the ring plate with a lower face to the upper end surface of the nozzle.
- Fig. 1 shows an outwardly opening nozzle 2.
- the invention is not limited to an outwardly opening nozzle 2 and could also be implemented with an inwardly opening nozzle.
- the needle 3 comprises in a middle part a guiding section 21 that is used to precisely guide the needle 3 in the nozzle 2. For a precise guiding, a small clearance is arranged between an outer face of the needle 3 and an inner face of the nozzle 2.
- the needle 3 extends in a housing 22 of the fuel injector.
- the second opening 8 is guided up to an end section at which the holding element 4 is tightly connected to a second ring 10.
- the second ring 10 is tightly connected to a bellow 5 through which the needle 3 extends into an actor chamber of the housing 22.
- a lower end of the bellow 5 is tightly connected over a first ring 9 with the needle 3.
- the first ring 9 is arranged above the ring plate 1.
- a first welding 14 is used for tightly connecting the first ring 9 with the needle 3.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The present invention relates to a nozzle for a fuel injector.
- In the non-disclosed patent application
WO02/36959A2 - The first sleeve has the task of damping high pressure waves that are generated in the fuel chamber by starting and stopping the injection. The high pressure waves might damage the bellow that tightly seals the lower part of the injector from the upper part.
- The
German patent application DE 199 58 704 A1 discloses a nozzle for an injector that can be fixed to a housing of an injector, comprising a needle that is movably arranged within the nozzle. A bellow is provided as a sealing element in order to separate a fuel region from an actor chamber. A first end ring of the bellow is tightly connected with an element that is part of the nozzle or at least tightly connected with the nozzle. A damping element is provided, whereby the needle extends through the damping element. The damping element divides the fuel region into the fuel chamber and a second chamber. The second chamber is limited by the bellow. The fuel chamber is limited by the nozzle and the needle. A ring plate is arranged as a damping element and the ring plate is held by a holding member - The
US patent US 6,334,576 B1 discloses a fuel injector having a ball seat with multiple tip geometry. The fuel injector having a fuel inlet, a fuel outlet and a fuel passage way extending from the fuel inlet to the fuel outlet along a longitudinal axis. The fuel injector includes an armature disposed within a body, a cylindrical needle operatively connected to the armature, the needle having a support portion and a flow control portion, and a seat disposed at the fuel outlet. - The object of the present invention is to provide a nozzle with a simple and inexpensive damping element. The object is attained by means of a nozzle according to
claim 1. - The nozzle for the fuel injector according to the present invention is believed to have an advantage over the related prior art since the nozzle comprises a simple damping element in the shape of a ring plate. The ring plate is held by a holding member and a clearance is provided between an inner face of the ring plate and the needle between 10 to 120 µm.
- Further advantageous embodiments of the invention are disclosed in the dependent claims.
- Using a simple ring plate as a damping element reduces the production costs of the nozzle. Furthermore, the ring plate is easier to incorporate into the nozzle in comparison to the sleeve that is known from the prior art. Furthermore, the ring plate is not used for guiding the needle. Therefore the ring plate does not have to be placed into a precise position to the needle. Therefore the nozzle and the ring plate can be produced independently. As a result, it is not necessary to adjust the shape of the nozzle and the shape of the ring plate to each other.
- In a preferred embodiment of the invention the ring plate is arranged on an upper end surface of the nozzle. The upper end surface is directed towards the housing and the ring plate is pressed against the upper end surface by a holding element. This arrangement of the ring plate is advantageous for mounting the ring plate.
- In a further advantageous embodiment of the invention the ring plate is held by a holding element that basically has the shape of a sleeve that is tightly connected with the bellow at its upper end and tightly connected with the nozzle at its lower end. Therefore the sleeve is used with a first function for holding the ring plate at the upper end surface of the nozzle and with a second function for tightly sealing off the nozzle from an upper part of the injector. Using the sleeve for this two functions saves a separate member for holding the ring plate at the upper end surface of the nozzle.
- In a further preferred embodiment of the invention the sleeve comprises at an outer face a holding face that is used for pressing the nozzle against the injector housing with a nut. Therefore, a separate element for providing a holding face for fixing the nozzle with the housing of the injector is made expedient.
- An advantageous connection between the sleeve and the nozzle is attained by providing a ring nut at the upper end of the nozzle that is stuck into the sleeve. The sleeve comprises a first cylindrical part that surrounds the ring nut. The first cylindrical part merges with a second cylindrical part by means of a step face. The second cylindrical part has a smaller diameter than the first part. The step face is adjacent to an upper plane of the ring plate and presses the ring plate with a lower face to the upper end surface of the nozzle. The described shape of the nozzle and of the sleeve has the advantage that the sleeve can easily be fixed tightly to the nozzle pressing the ring plate against the upper end face of the nozzle.
-
- Fig. 1 shows a cross-sectional view of a nozzle of a fuel injector in an exemplary embodiment of the present invention.
- Fig. 2 shows the damping element and the needle in more detail.
- Fig. 1 shows a sectional view of a
fuel injector 37. Thefuel injector 37 comprises ahousing 22 in which anactuator 30, especially a piezoelectric actuator, is arranged. The actuator can be used for directly or indirectly actuating aneedle 3 that is arranged within anozzle 2. If theactuator 30 does not directly act upon the needle, a pressure chamber can be used for actuating the needle. In this case the actuator controls a pressure valve that determines the pressure of the pressure chamber. The pressure chamber may be limited by a movable piston that is actuating theneedle 3. - Fig. 1 shows an outwardly opening
nozzle 2. However, the invention is not limited to an outwardly openingnozzle 2 and could also be implemented with an inwardly opening nozzle. - The
needle 3 comprises at a lower end avalve head 17 which is directed towards avalve seat 18 of thenozzle 2. In a closed position thevalve head 17 rests on thevalve seat 18 with a sealing face and closes afuel chamber 16. Thefuel chamber 16 is arranged between theneedle 3 and thenozzle 2. Thefuel chamber 16 is connected to afuel line 23 that delivers fuel with high pressure. - The
needle 3 comprises in a middle part a guidingsection 21 that is used to precisely guide theneedle 3 in thenozzle 2. For a precise guiding, a small clearance is arranged between an outer face of theneedle 3 and an inner face of thenozzle 2. Theneedle 3 extends in ahousing 22 of the fuel injector. - The
nozzle 2 has the shape of a sleeve with an upper end face 24 that is directed towards thehousing 22. Theupper end face 24 has the shape of a plane ring face. Furthermore thenozzle 2 comprises at an outer, upper end face aring nut 25 showing a smaller diameter than a lower part of thenozzle 2. - On the upper end face 24 a damping member in the shape of a
ring plate 1 is arranged. Thering plate 1 comprises a center hole that has a greater diameter than the diameter of theneedle 3. Theneedle 3 extends through thering plate 1 from thenozzle 2 into thehousing 22. Between theneedle 3 and thering plate 1, a clearance is provided that is within a range of values from 10 µm to 120 µm. - At the
upper end face 24, thering plate 1 is held by a holdingelement 4 which basically shows the shape of a sleeve. With a first part, the holdingelement 4 encloses thering nut 25. Advantageously, the holdingelement 4 is connected by awelding line 26 at a lower end face of the first part. The first part comprises a cylindricalfirst opening 6 with a first diameter. The firstcylindrical opening 6 merges with a second cylindrical opening 8 with a smaller diameter via a stop shoulder 7. The stop shoulder 7 has the shape of a ring face that is perpendicularly arranged to a longitudinal axis of the holdingelement 4. The longitudinal axis of the holding element is arranged in parallel to the longitudinal axis of theneedle 3. The stop shoulder 7 is arranged in parallel to theupper surface 24. Between the stop shoulder 7 and the upper end face 24 thering plate 1 is arranged. - The diameter of the second opening 8 of the holding
element 4 is smaller than the outer diameter of thering plate 1. Furthermore the diameter of thefirst opening 6 of the holdingelement 4 is greater than the outer diameter of thering plate 1. - The second opening 8 is guided up to an end section at which the holding
element 4 is tightly connected to asecond ring 10. Thesecond ring 10 is tightly connected to abellow 5 through which theneedle 3 extends into an actor chamber of thehousing 22. A lower end of thebellow 5 is tightly connected over afirst ring 9 with theneedle 3. Thefirst ring 9 is arranged above thering plate 1. For tightly connecting thefirst ring 9 with theneedle 3, afirst welding 14 is used. - For tightly connecting the second ring 10 a
second welding 15 is used. The first and thesecond welding - Between the
bellow 5 and the holding element 4 asecond chamber 28 is arranged. Thesecond chamber 28 is hydraulically connected via aclearance 19 which is arranged between thering plate 1 and theneedle 3 to thefuel chamber 16. Thefuel chamber 16 is connected with thefuel line 23. - In a closed position of the
needle 3, high pressures act within thefuel chamber 16. In this situation, high pressures also act within thesecond chamber 28. If theneedle 3 is moved to an open position, thevalve head 17 is moved from thevalve seat 18, thus opening thefuel chamber 16. This causes a fast and large decrease in pressure within thefuel chamber 16. If theneedle 3 is moved to the closing position, the pressure in the fuel chamber quickly increases to a high value. These changes in pressure are not directly guided to thesecond chamber 28 because of thering plate 1. The dimensions of theclearance 19 between thering plate 1 and theneedle 3 are such that pressure changes in thefirst chamber 16 are guided to thesecond chamber 28 with a time delay. Furthermore the time gradient of the pressure change is reduced. This causes smaller pressure waves in thesecond chamber 28. Small pressure waves have the advantage that thebellow 5 and the tight connections between thebellow 5 and the holdingelement 4 or theneedle 3 are protected against high pressure changes. As a result, the connections seal off thesecond chamber 28 against anactor chamber 38 that is arranged within thehousing 22 of thefuel injector 37 for a longer time. - At an upper side, the holding
member 4 comprises aring face 29 that is arranged perpendicularly to the longitudinal axis of theneedle 3 and bordering theactor chamber 38. The upper end of theneedle 3 is connected with aplate 12 whereby the end of theneedle 3 is arranged within a center of theplate 12. Between theplate 12 and thering face 29, abiased pressure spring 13 is arranged. Thepressure spring 13 prestresses thevalve head 17 of theneedle 3 against thevalve seat 18 of thenozzle 2. For pushing theneedle 3 in an open position, theactuator 30 has to push down theplate 12. - In a preferred embodiment of the invention, the holding
element 4 comprises aslanting holding face 31 that is directed to a corresponding slanting second holdingface 32 of anut 33. The holdingface 31 is arranged on the outside of the first part of the holdingelement 4. Thenut 33 comprises ascrew thread 34. Thescrew thread 34 is connected with asecond screw thread 35 that is arranged on the outside of thehousing 22. Thenozzle 2 is fixed to thehousing 22 by screwing thenut 33 in the direction of thehousing 22. The screwing of thenut 33 pushes the holdingelement 4 to astop face 36 of thehousing 22. - Fig. 2 shows in detail the
clearance 19 between thering plate 1 and theneedle 3. The center hole of thering plate 1 has the shape of a circle. In the region of thering plate 1, the cross section of theneedle 3 also shows the shape of a circle.
Claims (5)
- Nozzle (2) for an injector (37) that can be fixed to a housing (22) of the injector (37), comprising a needle (3) that is movably arranged within the nozzle (2),
whereby a bellow (5) is provided as a sealing element in order to separate a fuel region (16, 28) from an actor chamber (38),
whereby a first end ring of the bellow (5) is tightly connected with a holding member (4) that is part of the nozzle (2) or at least tightly connected with the nozzle (2),
whereby a damping element (1) is provided,
whereby the needle (3) extends through the damping element (1),
whereby the damping element (1) divides the fuel region into a fuel chamber (16) and a second chamber (28),
whereby the second chamber (28) is limited by the bellow (5), whereby the fuel chamber is limited by the nozzle (2) and the needle (3),
whereby a ring plate (1) is arranged as a damping element, whereby the ring plate (1) is held by the holding member (4),
characterized in
that a clearance (19) between the needle (3) and the ring plate (1) has a value in the range of 10 to 120 µm. - Nozzle according to claim 1, characterized in that the holding member (4) is a sleeve,
that a lower part of the sleeve (4) is tightly connected to an upper end of the nozzle (2),
that the needle (3) is partly arranged within the sleeve (4), that the second end of the bellow (5) is tightly connected to an upper end of the sleeve (4). - Nozzle according to any of the claims 1 or 2, characterized in that the ring plate (1) is arranged on an upper end face of the nozzle (2),
that the upper end face (24) is directed towards the housing (22),
that the ring plate (1) is held against the upper end face (24) by the holding member (4). - Nozzle according to claim 2, characterized in that the sleeve (4) comprises a holding face (31) on the outside that is used for pressing the nozzle (2) against the injector housing (22) by means of a holding face (32) of a nut (33).
- Nozzle according to any of the claims 2 to 4, characterized in that the nozzle (2) comprises a ring nut (25) on the outside of an upper end,
that the sleeve (4) surrounds the ring nut (25) with a first cylindrical part,
that the sleeve (4) is fixed to the nozzle (2),
that the first cylindrical part merges by a step face (7) into a second cylindrical part,
that the second part has a smaller diameter than the first part,
that the step face (7) is adjacent to the ring plate (1) and holds the ring plate (1) at the upper end face (24).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002622431 DE60222431T2 (en) | 2002-10-22 | 2002-10-22 | fuel injector |
EP20020023553 EP1413743B1 (en) | 2002-10-22 | 2002-10-22 | Nozzle for a fuel injector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020023553 EP1413743B1 (en) | 2002-10-22 | 2002-10-22 | Nozzle for a fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1413743A1 EP1413743A1 (en) | 2004-04-28 |
EP1413743B1 true EP1413743B1 (en) | 2007-09-12 |
Family
ID=32049997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020023553 Expired - Fee Related EP1413743B1 (en) | 2002-10-22 | 2002-10-22 | Nozzle for a fuel injector |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1413743B1 (en) |
DE (1) | DE60222431T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2739150C1 (en) * | 2020-03-07 | 2020-12-21 | Максим Николаевич Карпов | Ultrasonic piezoelectric transducer |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102536570A (en) * | 2012-01-10 | 2012-07-04 | 中国兵器工业集团第七0研究所 | Compaction device for common rail fuel injector of horizontal dual-opposed diesel engine |
DE102018203145A1 (en) * | 2018-03-02 | 2019-09-05 | Robert Bosch Gmbh | Nozzle assembly for a fuel injection valve for injecting a gaseous and / or liquid fuel, fuel injection valve |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2717550B1 (en) * | 1994-03-17 | 1996-06-07 | Europ Propulsion | Integral cryogenic vacuum valve. |
EP1046809B1 (en) * | 1999-04-20 | 2005-08-10 | Siemens Aktiengesellschaft | Fluid metering device |
DE19947779A1 (en) * | 1999-10-02 | 2001-04-12 | Bosch Gmbh Robert | Fuel injector |
DE19958704C2 (en) * | 1999-12-06 | 2002-10-02 | Siemens Ag | Device for transmitting an actuator movement and fluid metering device with such a device |
US6334576B1 (en) * | 2000-06-30 | 2002-01-01 | Siemens Automotive Corporation | Fuel injector having a ball seat with multiple tip geometry |
KR100588766B1 (en) * | 2000-11-02 | 2006-06-14 | 지멘스 악티엔게젤샤프트 | Fluid dosing device with a throttle point |
-
2002
- 2002-10-22 EP EP20020023553 patent/EP1413743B1/en not_active Expired - Fee Related
- 2002-10-22 DE DE2002622431 patent/DE60222431T2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2739150C1 (en) * | 2020-03-07 | 2020-12-21 | Максим Николаевич Карпов | Ultrasonic piezoelectric transducer |
Also Published As
Publication number | Publication date |
---|---|
EP1413743A1 (en) | 2004-04-28 |
DE60222431D1 (en) | 2007-10-25 |
DE60222431T2 (en) | 2008-06-12 |
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