EP3887666A1 - Nozzle of a fuel injector, and fuel injector comprising such a nozzle - Google Patents
Nozzle of a fuel injector, and fuel injector comprising such a nozzleInfo
- Publication number
- EP3887666A1 EP3887666A1 EP20704495.9A EP20704495A EP3887666A1 EP 3887666 A1 EP3887666 A1 EP 3887666A1 EP 20704495 A EP20704495 A EP 20704495A EP 3887666 A1 EP3887666 A1 EP 3887666A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- contact surface
- housing contact
- rotation
- axis
- 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 27
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 description 9
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000003993 interaction Effects 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
- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
- 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
- F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
-
- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
-
- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
Definitions
- the present invention relates to a nozzle of a fuel injector and to a fuel injector with such a nozzle.
- fuel is usually injected into a combustion chamber via an injector in a certain amount and for a certain period of time. Because of the very short injection times, which are in the microsecond range, it is necessary to open or close the outlet opening of the injector at a very high frequency.
- An injector typically has a nozzle needle (also: injector needle) which allows a fuel to which a high pressure is applied to escape when an outlet hole of the injector is opened.
- This nozzle needle acts in the Interaction with this outlet opening like a plug that allows the fuel to escape when it is lifted. Accordingly, it is therefore necessary to lift this needle at relatively short time intervals and to slide it back into the outlet opening again after a short time.
- the typical structure of such a fuel injector comprises a nozzle which has a recess for receiving part of the nozzle needle.
- an injector housing is provided in which the nozzle needle is raised and lowered.
- both the housing and the nozzle have a stop surface which creates a sealing connection when a sufficiently high contact pressure is exerted on the two parts.
- a nozzle clamping nut is usually provided, which engages the nozzle on a projection surface (also called: shoulder area or shoulder) and by means of a threaded connection of nozzle clamping nut and housing the necessary pressure between the generated both stop surfaces of the nozzle and housing.
- the disadvantage here is that tensile stresses arise in the transition area of the nozzle body to the flange-like projection surface due to the high pressure required, which in this area under operating conditions promote cracks as well as crack formation and crack propagation. So there is an increasing number of cracks (vibration corrosion cracking), the occurrence of which is caused by the high tensile stresses at the internal transition from the nozzle body to the projection surface.
- the object of the present invention is therefore to develop a nozzle of a fuel injector or a fuel injector with such a nozzle in such a way that the tensile stresses occurring in conventional nozzles are reduced without increasing the complexity and costs of the nozzle.
- the nozzle of a fuel injector a rotationally symmetrical nozzle body with a cavity for inserting a nozzle needle, a nozzle tip which is provided at one longitudinal end of the nozzle body and has openings for discharging fuel, a housing contact surface which is at the other longitudinal end of the nozzle body is provided and is used to press against a housing of a fuel injector, and a projection surface, which is provided in the longitudinal extension of the nozzle body between the nozzle tip and the housing contact surface and is used to attach a nozzle clamping nut.
- the nozzle is characterized in that the minimum distance from the axis of rotation of the nozzle body to the projection surface is smaller than the minimum distance from the axis of rotation of the nozzle body to the housing contact surface.
- the maximum distance perpendicular to the axis of rotation of the nozzle body to an outer edge of the projection surface is smaller than the maximum distance perpendicular to the axis of rotation of the nozzle body to an outer edge of the
- an inner line of the projection surface which defines the radial minimum distance of the projection surface to the axis of rotation along the circumference of the nozzle, has a smaller area than an inner line of the housing contact surface, which along the circumference of the nozzle defines the respective radial minimum distance of the Housing contact area defined.
- the minimum distance between the cantilever surface or the housing contact surface is determined for each angle along the circumference of the nozzle, so that a closing line is created for the cantilever surface or the housing contact surface that surrounds the axis of rotation.
- the inner line of the projection surface or the housing contact surface corresponds to a circle
- the line can correspond, for example, to a polygon or another rotationally symmetrical shape.
- the inner line of the housing contact surface completely encloses the inner line of the projection surface when projected along the axis of rotation. This ensures that at every point in the circumferential direction of the nozzle there is an advantageous flow of force from the inside to the outside.
- an outline of the projection surface which defines the radial distance from the axis of rotation to an outer edge of the projection surface along the circumference of the nozzle, has a smaller area than an outline of the housing contact surface, which extends along the circumference of the nozzle defined in each case radial distance from the axis of rotation to an outer edge of the housing contact surface.
- the distance from the axis of rotation to an outer edge of the projection surface to its or the housing contact surface is determined for each angle along the circumference of the nozzle, so that a closing line is created for the outer edge of the projection surface or the housing contact surface that surrounds the axis of rotation.
- the outer line of the housing contact surface completely surrounds the outer line of the projection surface when projected along the axis of rotation.
- the distance from the axis of rotation to an outer edge of the contact surface is always greater at any given angle in the circumferential direction than the distance from the axis of rotation to an outer edge of the cantilever surface at the specific angle in the circumferential direction.
- a center line of the projection surface which along the circumference of the nozzle centrally subdivides the distance from the inner to the outer line of the projection surface in the radial direction, defines a smaller area than a center line of the housing contact surface, which along the circumference of the nozzle the distance from the inner to the outer line of the Housing contact surface (4) divided centrally in the radial direction.
- a center line is introduced which runs in the middle between the outer line and the inner line and is arranged in the middle of the distance between the respective points for a specific circumferential angle of the outer and inner line.
- center line of the housing contact surface completely encloses the center line of the projection surface when projected along the axis of rotation.
- the housing contact surface and / or the projection surface is arranged perpendicular to the axis of rotation of the nozzle body.
- Cantilever surface has the shape of a circular ring. Furthermore, it can be provided that the inside diameter of the circular ring of the projection surface is smaller than the inside diameter of the circular ring of the housing contact surface. Alternatively or additionally, it can be provided that the outer diameter of the circular ring of the projection surface is smaller than the outer diameter of the circular ring of the housing contact surface.
- the invention also includes the advantageous further development according to which the nozzle is formed in one piece.
- the nozzle is designed to be rotationally symmetrical.
- the nozzle continuously increases in its outer diameter and / or its inner diameter transversely to the axis of rotation from the tip to the housing contact surface.
- the cross section of the nozzle thus increases continuously from the nozzle tip to the housing contact surface or remains the same. It can only be the case that the corresponding edge is ground in the transition to the housing contact surface, so that the feature of the continuous increase in cross section is only valid until shortly before the housing contact surface is reached.
- the invention further comprises a fuel injector with a nozzle according to one of the variants discussed above.
- the injector is also provided with a housing and a nozzle clamping nut, the nozzle clamping nut being in a threaded connection with the housing, so that the nozzle presses the housing contact surface of the nozzle against the housing by means of the force of the nozzle clamping nut on the projection surface.
- Fig. 1 a sectional view of part of an injector for
- FIG. 2 an enlarged section around the shoulder area of the nozzle shown in FIG. 1, on which the nozzle clamping nut engages, and
- Fig. 1 shows a sectional view of part of an injector for injecting fuel.
- the injector comprises a housing 5 in which, among other things, the nozzle needle 8 is received. This protrudes from the housing 5 and is received by the nozzle 1 in a receptacle 2 provided for this purpose. At its distal end, the nozzle 1 has its nozzle tip 3, which is provided with openings for discharging fuel.
- a nozzle clamping nut 7 is placed on the nozzle 1 and brought into engagement with a thread provided on the housing 5. Due to the threaded connection between the nozzle clamping nut 7 and the housing 5, the housing contact surface 4 of the nozzle 1 directed towards the housing 5 is pressed against a corresponding surface of the housing, so that a sealing connection results.
- the nozzle clamping nut 7 presses against the projection surface 6 of the nozzle 1 and thus presses the nozzle 1 against the housing 5.
- the axis of rotation 8 or, in the case of a rotationally symmetrical structure, the axis of rotation 8 is also present.
- the dotted rectangle shows the area shown enlarged in FIG. 2.
- FIG. 2 the elements that have already been introduced are provided with the same reference symbols as in FIG the axis of rotation 8 runs. This is due to the inner edge of the housing contact surface 4, which is arranged closer to the axis of rotation 8 opposite the projection surface 6 and which enables the force flow shown. As a result, such an arrangement leads to a large tensile stress in the transition area to the flange-like projection or the projection surface 6, as indicated by the thick arrow pointing obliquely to the bottom left in the drawing is symbolized. The presence of such high tensile stress tends to cause cracks to appear in the shoulder area of the nozzle.
- FIG. 3 now shows a nozzle 1 according to the invention, the already known elements of the nozzle 1 having been provided with the same reference numerals as in the previous figures. These are no longer discussed separately in the following.
- the maximum distance D 3 perpendicular to the axis of rotation 8 of the nozzle body 1 to an outer edge of the projection surface 6 is smaller than the maximum distance D 4 perpendicular to the axis of rotation 8 of the nozzle body 1 to an outer edge of the Housing contact surface 4. This also contributes to the desired reduction in tensile stress in the transition area of the shoulder of the nozzle 1.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019103329.2A DE102019103329A1 (en) | 2019-02-11 | 2019-02-11 | Nozzle of a fuel injector and fuel injector with such a nozzle |
PCT/EP2020/052929 WO2020165009A1 (en) | 2019-02-11 | 2020-02-06 | Nozzle of a fuel injector, and fuel injector comprising such a nozzle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3887666A1 true EP3887666A1 (en) | 2021-10-06 |
EP3887666B1 EP3887666B1 (en) | 2024-04-03 |
Family
ID=69528826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20704495.9A Active EP3887666B1 (en) | 2019-02-11 | 2020-02-06 | Nozzle of a fuel injector, and fuel injector comprising such a nozzle |
Country Status (5)
Country | Link |
---|---|
US (1) | US20220145839A1 (en) |
EP (1) | EP3887666B1 (en) |
CN (1) | CN113490790A (en) |
DE (1) | DE102019103329A1 (en) |
WO (1) | WO2020165009A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08254169A (en) * | 1995-03-17 | 1996-10-01 | Mitsubishi Heavy Ind Ltd | Fuel injection valve for internal combustion engine |
EP1649160B1 (en) * | 2003-07-17 | 2009-08-19 | Ganser-Hydromag Ag | Fuel injection valve for internal combustion engines |
DE102004024119B4 (en) * | 2004-05-14 | 2006-04-20 | Siemens Ag | Nozzle assembly and injector |
US7963464B2 (en) * | 2008-01-23 | 2011-06-21 | Caterpillar Inc. | Fuel injector and method of assembly therefor |
CH700396A1 (en) * | 2009-02-09 | 2010-08-13 | Ganser Hydromag | Fuel injection valve for internal combustion engines. |
DE102012217991A1 (en) * | 2012-10-02 | 2014-04-03 | Continental Automotive Gmbh | Nozzle assembly for a fluid injector and fluid injector |
-
2019
- 2019-02-11 DE DE102019103329.2A patent/DE102019103329A1/en active Pending
-
2020
- 2020-02-06 EP EP20704495.9A patent/EP3887666B1/en active Active
- 2020-02-06 US US17/430,308 patent/US20220145839A1/en active Pending
- 2020-02-06 WO PCT/EP2020/052929 patent/WO2020165009A1/en unknown
- 2020-02-06 CN CN202080014160.5A patent/CN113490790A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020165009A1 (en) | 2020-08-20 |
CN113490790A (en) | 2021-10-08 |
US20220145839A1 (en) | 2022-05-12 |
EP3887666B1 (en) | 2024-04-03 |
DE102019103329A1 (en) | 2020-08-13 |
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