EP2187034B1 - Un injecteur de combustible avec élément d'étanchéité axial - Google Patents
Un injecteur de combustible avec élément d'étanchéité axial Download PDFInfo
- Publication number
- EP2187034B1 EP2187034B1 EP20080105799 EP08105799A EP2187034B1 EP 2187034 B1 EP2187034 B1 EP 2187034B1 EP 20080105799 EP20080105799 EP 20080105799 EP 08105799 A EP08105799 A EP 08105799A EP 2187034 B1 EP2187034 B1 EP 2187034B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- needle
- sealing element
- axial sealing
- throttle plate
- 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.)
- Active
Links
- 239000000446 fuel Substances 0.000 title claims description 53
- 238000007789 sealing Methods 0.000 title claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 230000033001 locomotion Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 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
- 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
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
Definitions
- the invention relates to the field of fuel injectors and specifically to the field of common rail fuel injectors.
- the common rail fuel injectors known in the state of the art typically comprise a nozzle, a needle moving inside the nozzle, a fuel inlet supplying fuel to the injector, a return fuel path, a valve to regulate the pressure inside the injector, a pressure control chamber, a high pressure volume having a pressure of about 2000 bars and a relatively low pressure volume having a pressure of about 1900 bars.
- the high pressure and low pressure volumes are separated by a throttle plate with a bore in it to allow flow of fuel from high pressure volume to low pressure volume.
- the throttle plate is tightly coupled to the needle and does two functions, one: providing a bearing for the needle and second: preventing the leakage of fuel through the gap between throttle plate and the needle. But this dual functionality results in an unwanted guiding function and an uncertain bearing function because, the rotation and positioning tolerances of the needle can lead to a large radial offset of the throttle plate to the upper and lower part of the injector.
- Document EP 1 936 180 A2 discloses such a fuel injector.
- the sufficient gap between the throttle plate and the needle will provide a radial offset to the needle, reducing the wear out of the needle because of the radial forces acting upon the needle.
- the small gap of about 2 to 10 micrometers between the axial sealing element and the needle will prevent the leakage of fuel from high pressure volume to the low pressure volume providing better regulation of the pressure in the high and low pressure areas.
- the axial sealing element does not need any special type of material. It is made up of steel.
- the axial sealing element does not need any special kind of design. It is a simple disk.
- the axial sealing element is fixed with a simple compression spring.
- the axial sealing element and the throttle plate have a self sealing effect with each other because of the difference in pressure in high pressure volume and a low pressure volume, providing easy prevention of leakage of fuel.
- the fuel injector comprises of a nozzle 12, a needle 14 reciprocatively movable in the nozzle 12, a high pressure fuel inlet 16 supplying fuel to the injector, a high pressure volume 18 where the fuel is stored under high pressure up to 2000 bars, a low pressure volume 20 containing fuel at a relatively lower pressure, of about 1900 bars, a pressure control chamber 22 to regulate the force acting on the needle 14, a member 24 valve controlled by the valve actuator 26 to regulate the pressure in the pressure control chamber 22, a biasing spring 28 to keep the valve member 24 closed when the valve actuator is de-activated, a return fuel path 30 to return the fuel from the pressure control chamber 22 to the low pressure source which is not shown in the figure, a guide 32 holding the needle 14 a throttle plate 36 and an axial sealing element 38.
- the throttle plate 36 contains a throttle bore 40 to allow the flow of fuel from high pressure volume 18 to low pressure volume 20.
- the fuel injector is connected to the common rail 3 through the fuel inlet 16.
- the common rail 3 is supplied with fuel by a pump 2.
- a typical common rail fuel injection system which is not shown in the figure, comprises of a fuel tank storing the fuel, a high pressure fuel pump supplying fuel to a plurality of injectors connected to a common rail, the injectors injecting fuel into a combustion chamber where the air and fuel mixture is burnt to produce power to move the vehicle.
- An electronic control unit controls the combustion engine based on different operating conditions of the combustion engine.
- the fuel from the high pressure fuel flows through the fuel inlet 16, enters the high pressure volume 18.
- the fuel from high pressure volume 18 passes through the throttle bore 40 and enters the low pressure volume 20 and also passes through the fuel inlet 42 and enters the pressure control chamber 22.
- the valve member 24 is closed at this point of time as the valve actuator 26 is de-activated and the biasing spring 28 keeps the valve member 24 closed.
- the valve actuator is activated causing the valve member 24 to open.
- the fuel from the pressure control chamber 22 will flow through the return fuel path 24A to a low pressure source, causing the pressure in the pressure control chamber 22 to drop rapidly, resulting forces on the needle to move towards the member 24 valve.
- the movement of the needle 14 towards the member 24 valve will open the injector holes 44 and the fuel is injected into the combustion chamber which is not shown in the figure.
- the injection of fuel into the combustion chamber will reduce the pressure in the low pressure volume 20.
- the valve actuator valve is de-activated causing the valve member 24 to close.
- the fuel starts flowing into the pressure control chamber 22.
- the pressure in the pressure control chamber 22 increases rapidly causing the needle 12 to move towards the injector holes 44 closing the injector holes 44 and stopping the fuel injection into the combustion chamber.
- the pressure difference between the high pressure volume 18 and low pressure volume 20 is necessary to close the needle rapidly.
- the throttle plate is tightly coupled to the needle with a very small gap in between to prevent the leakage of fuel from high pressure volume to low pressure volume.
- the throttle plate is tightly coupled to the needle to prevent the leakage of fuel from low pressure volume to high pressure volume, the result is, the needle does not have any offset in the radial direction. Because of the rotation of the needle or because of the movement of the needle in radial direction, there will be high wear out of the needle and also asymmetric spray formation.
- Shown in Fig. 2 is only a part of an injector. Shown in fig. 2 is a needle 14, a throttle plate 36 and an axial sealing element 38.
- the throttle plate has a throttle bore 40 to allow flow of fuel from high pressure volume 18 to low pressure volume 20 and vice versa.
- the throttle plate 36 has a sufficient gap with the needle, the gap being about 50 micorometers to 500 micrometers based on the length of the needle and the offset it would undergo under different conditions during its motion. Because of the sufficient gap between the throttle plate 36 and the needle 14, the disadvantage like, high wear out of all the supporting points of the nozzle needle due to the large radial bearing forces, a high one-sided nozzle seat wear out due to the large radial bearing forces, an asymmetrical spray formation due to the needle offset etc. are eliminated.
- the axial sealing element 38 has a very narrow gap of about 2 to 10 micrometers with the needle 14. This narrow gap will prevent the leakage of the fuel from low pressure volume 20 to high pressure volume 18.
- the axial sealing element 38 is in contact with the throttle plate 36 and the axial sealing element 38 is movable with respect to the throttle plate 36 in radial direction. The movement of the axial sealing element 38 in radial direction will provide flexibility for the radial movement of the needle if any such movement occurs.
- the axial sealing element 38 and the throttle plate 36 have a self sealing effect with each other because of the difference in the pressure in high pressure volume 18 and the low pressure volume 20.
- Fig. 3 Shown in Fig. 3 is the invention according to a second embodiment. Here all the elements remain same, the difference being that the axial sealing element is fixed to a spring 42. The functionality of the axial sealing element 38 and the throttle plate 36 remains as explained with Fig. 2 .
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Claims (4)
- Injecteur de combustible capable d'injecter du combustible dans une chambre de combustion d'un moteur à combustion interne, comprenant une buse (12) dans laquelle se déplace le pointeau, un pointeau (14) se déplaçant suivant un mouvement alternatif dans la buse (12), un volume à haute pression (18) fournissant du carburant à la chambre de régulation de pression (22) et au volume basse pression (20), la chambre de régulation de pression (22) régulant la pression pour le déplacement du pointeau (14), un organe de soupape (24) permettant au combustible provenant de la chambre de régulation de pression de revenir à la source de basse pression, et une plaque d'étranglement (36) avec un alésage (40), ledit injecteur de carburant étant caractérisé par un élément d'étanchéité axial (38) en contact avec la plaque d'étranglement (36) et déplaçable dans la direction radiale par rapport à la plaque d'étranglement (36), ledit élément d'étanchéité axial (38) ayant un petit espace qui est de l'ordre de 2 à 10 microns par rapport au pointeau (14), ladite plaque d'étranglement (36) ayant un espace suffisant de l'ordre de 50 à 500 microns par rapport au pointeau (14).
- Injecteur de carburant selon la revendication 1, dans lequel l'élément d'étanchéité axial (38) est en acier.
- Injecteur de carburant selon la revendication 1, dans lequel l'élément d'étanchéité axial (38) est une plaque de disque.
- Injecteur de carburant selon la revendication 1, dans lequel l'élément d'étanchéité axial (38) est fixé dans un état stable par un ressort de compression (42).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20080105799 EP2187034B1 (fr) | 2008-11-14 | 2008-11-14 | Un injecteur de combustible avec élément d'étanchéité axial |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20080105799 EP2187034B1 (fr) | 2008-11-14 | 2008-11-14 | Un injecteur de combustible avec élément d'étanchéité axial |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2187034A1 EP2187034A1 (fr) | 2010-05-19 |
EP2187034B1 true EP2187034B1 (fr) | 2013-06-19 |
Family
ID=40362029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080105799 Active EP2187034B1 (fr) | 2008-11-14 | 2008-11-14 | Un injecteur de combustible avec élément d'étanchéité axial |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2187034B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017218869A1 (de) * | 2017-10-23 | 2019-04-25 | Robert Bosch Gmbh | Injektor |
CN110848060B (zh) * | 2019-10-14 | 2022-03-15 | 中国北方发动机研究所(天津) | 一种电控蓄压喷油器 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006036447A1 (de) * | 2006-08-04 | 2008-02-07 | Robert Bosch Gmbh | Injektor für ein Kraftstoffeinspritzsystem |
DE102006060657A1 (de) * | 2006-12-21 | 2008-07-03 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE102007021330A1 (de) * | 2007-05-07 | 2008-11-13 | Robert Bosch Gmbh | Kraftstoffinjektor für eine Brennkraftmaschine mit Common-Rail-Einspritzsystem |
-
2008
- 2008-11-14 EP EP20080105799 patent/EP2187034B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
EP2187034A1 (fr) | 2010-05-19 |
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