EP2150696A1 - Injector for a fuel injection system - Google Patents
Injector for a fuel injection systemInfo
- Publication number
- EP2150696A1 EP2150696A1 EP08759421A EP08759421A EP2150696A1 EP 2150696 A1 EP2150696 A1 EP 2150696A1 EP 08759421 A EP08759421 A EP 08759421A EP 08759421 A EP08759421 A EP 08759421A EP 2150696 A1 EP2150696 A1 EP 2150696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- injector
- chamber
- needle
- pressure booster
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
Definitions
- the present invention relates to an injector for a fuel injection system of a
- a supply line from the fuel to the pressure booster usually takes place via a plurality of interconnected bores, which, however, weaken the injector body and thereby impair its durability and are also susceptible to leaks.
- the injector according to the invention with the features of claim 1 has the advantage that no holes for a hydraulic connection of a pressure booster must be provided in the injector body and thereby the durability of the injector according to the invention can be increased.
- the injector according to the invention has a pressure booster section, also called actuator section, and a
- Needle section wherein in the latter hubver aus a nozzle needle for controlling an injection of fuel through at least one injection hole is arranged.
- the pressure intensifier used to increase the fuel injection pressure has a stepped piston, a control rod and a pressure booster ground, which all together define a coupler space.
- a coupling path extending in the control rod is provided in the injector according to the invention, which connects the coupler chamber via a valve device located outside the injector to a high-pressure fuel supply.
- the core advantage is thus in the simple central connection of the fuel supply to the pressure booster. This makes it possible to realize a relatively high injection pressure while maintaining a moderate system pressure.
- the injector according to the invention also has a significantly improved multiple injection capability due to its large Injektorhochtulvolumens and lower pressure fluctuations due to lack of control lines.
- a quick switching or actuation of the nozzle needle is possible.
- the control rod expediently engages, with its end facing the nozzle needle, into a cavity embedded in the pressure intensifier bottom, which is hydraulically connected via a connecting path to a needle control chamber, which in turn is delimited by the nozzle needle, a surrounding nozzle needle sleeve and the pressure intensifier base.
- the pressure intensifier base axially penetrating connection path which may be formed for example as a bore, is in the
- the stepped piston is surrounded by a stroke sleeve which is adjustable in stroke or by a solid annular wall, wherein the stepped piston, the pressure intensifier bottom and the filling sleeve or the fixed annular wall together define a pressure booster chamber, usually also referred to as a booster chamber.
- a biasing spring may additionally be provided which is supported at one end on an injector-side stop and the other end on the filling sleeve and biases the latter against the pressure intensifier base.
- Ring wall together with the provided for the case of the filling sleeve biasing spring a translation device for translating the pressure prevailing in the coupler space pressure in a required for the injection process, significantly higher pressure in the booster chamber.
- a translation effect is characterized by the prevailing between the coupler chamber and the booster chamber clear
- a high-pressure chamber is arranged in the injector body, in which the control rod, the stepped piston and the filling sleeve or the annular wall are arranged.
- the high pressure chamber is compared to the coupler space, booster chamber and needle control room significantly larger and has the largest volume. A large volume
- High-pressure chamber has a positive effect on pressure oscillations in multiple injections, which can be kept to a small degree.
- the high-pressure fuel supply via a hydraulic line directly to the high-pressure chamber and indirectly connected via the valve means to the coupling path in the control rod.
- both the direct supply line to the high-pressure chamber and the indirect supply line via the valve device to the coupling path in the control rod are at least partially parallel in an injector end plate, so that a connection of the injector according to the invention to the high-pressure fuel supply via only one side, namely the Injektorstirnplatte is possible.
- structurally complicated wiring for example, the pressure booster room or the needle control room is not required.
- FIG. 2 is a view as in Fig. 1, but in another embodiment,
- Fig. 3 also a representation as in Fig. 1, but in another
- FIG. 4 shows a further embodiment of the injector according to the invention in a greatly simplified, fundamental longitudinal section.
- an injector 1 according to the invention comprises an injector body 2, which is usually assembled from two sections, namely a needle section 3 arranged at the bottom and a pressure translator section 4 arranged above it.
- the two sections 3 and 4 can be provided by a suitable connection technique , For example, a welded joint or a Be connected to each other screw.
- a union nut 5 is provided, which receives the needle section 3 and braced against the pressure booster section 4.
- the union nut 5 is preferably screwed to the pressure booster section 4.
- the injector 1 is fed by a high-pressure fuel supply 6 which is connected via a hydraulic line 7 directly to a high-pressure chamber 8 arranged in the injector 1 and indirectly via a hydraulic line 7 'having a valve device 9 to a coupling path 11 arranged in a control rod 10.
- the nozzle needle 13 has a nozzle needle sleeve 14 surrounding it, which is supported by a closing compression spring 15, which is supported on the one hand on the nozzle needle sleeve 14 and on the other hand on the nozzle needle 13 or on a stop arranged there Pressure booster ground 16 is biased.
- the closing compression spring 15 biases the nozzle needle 13 in its closed position.
- the nozzle needle 13 is arranged adjustable in stroke in a nozzle chamber 28, which has at least one provided in the pressure booster base 16 through opening 29 with a
- Booster chamber 27 is hydraulically connected.
- a pressure booster 17 is arranged to increase a fuel injection pressure relative to a system pressure.
- the pressure booster 17 has a stepped piston 18, the control rod 10 and the pressure booster base 16, which together define a coupler space 19. According to the invention runs in the control rod 10 of the
- the valve device 9 may be formed, for example, as a solenoid valve or piezoelectric actuator or as a 2/2 or 3/2-solenoid or piezo valve, which can represent a 3/2 functionality in combination with a servo valve.
- the control rod 10 engages with its, the nozzle needle 13 facing the end in a, recessed in the pressure booster cavity 16 cavity 20 which is hydraulically connected via a connection path 21 with a needle control chamber 22.
- the needle control chamber 22 is of the nozzle needle 13, the surrounding nozzle needle sleeve 14 and the Pressure booster bottom 16 limited.
- the cavity 20 is connected to the coupler space 19 via the coupling path 11, the coupling path 11 having radial openings 23 in the region of the coupler space 19.
- a control rod spring 24 may be provided, which biases the control rod 10 in the direction of the cavity 20, in this case upwards.
- a connecting line 30 is also provided, which is formed for example as a bore and which connects the pressure booster chamber 27 to the needle control chamber 22 hydraulically.
- a throttle device 31 may be provided, for example, the throttle device 31 may be formed in the communication path 21 as a drain throttle and the throttle device 31 in the connecting line 30 as a Z throttle.
- the stepped piston 18 of the pressure booster 17 is surrounded according to FIGS. 1 to 3 by a filling sleeve 25 mounted in a stroke-adjustable manner on the stepped piston 18.
- the stepped piston 18 is surrounded by a fixed annular wall 26.
- the annular wall 26 may be formed separately or integrally with the pressure intensifier base 16.
- the stepped piston 18, the pressure intensifier base 17 and the filling sleeve 25 or the fixed annular wall 26 define a pressure booster chamber 27.
- a stepped piston spring 32 is provided, which is supported on the one hand on an injector-side stop 33 and on the other hand on the stepped piston 18. According to FIGS. 1 and 2, the stepped piston spring 32 pushes the stepped piston 18 upwards and thus biases it in a non-operating state against a stop 33 ', which is designed as an annular outer step on the control rod 10.
- At least one axial passage opening 35 is provided in the injector body-side stop 33, which hydraulically connects the high-pressure chamber 8 with its section 8 'situated below the stop 33.
- a biasing spring 36 which biases the Be Schollhülse 25 against the pressure intensifier base 16.
- the Biasing spring 36 is designed as a tension spring 37, which is supported at one end on the stepped piston 18 and the other end to the Be Schollhülse 25 and biases the latter against pressure booster plate 16.
- the stepped piston 18 is designed as a so-called “free-floating piston", which has no stroke stop on the control rod 10.
- the control rod 10, as well as in FIGS 24 is tensioned and sealed against the end plate 34.
- the advantage here is that rapid pressure changes can be compensated directly by stroke changes of the stepped piston 18 and can thus be ensured that the injector 1 does not open unintentionally, in particular with rapid system pressure reduction.
- a sealing edge of the nozzle needle sleeve 14 in comparison to the embodiments of the injector 1 according to FIGS. 1 and 2 radially outward.
- a sealing diameter of the nozzle needle sleeve 14 is thus on a larger diameter, whereby an opening is achieved when a pressure in the needle control chamber 22 is greater than in the nozzle chamber 28th
- a stepped piston return is additionally newly released by means of the stepped piston spring 32 in order to be able to realize a space advantage. Therefore, the stepped piston spring 32 is supported via an annular collar 38 on the injector 2 and presses on a disc 39 on the stepped piston 18 to this after completion of the
- the mode of operation of the injector 1 according to the invention can be described as follows:
- valve device 9 For closing the injector 1, the valve device 9 is actuated, in particular closed, whereby the pressures in the needle control chamber 22 and in the coupler chamber 19 rise again to system pressure.
- the stepped piston spring 32 generates a slight negative pressure in the pressure booster chamber 27, whereby the Be Stirllhülse 25 opens and the provision of the stepped piston 18 in combination with a volume compensation leads to a provision of the injector 1 in its initial position.
- a particular advantage of the injector 1 according to the invention is the central arrangement of the coupling path 11 within the control rod 10, whereby high-pressure holes in the
- Injector body 2 can be omitted. As a result, a high injection pressure can be achieved with only a single valve device 9, while the system pressure is moderate. At the same time, a rapid switching of the nozzle needle 13 and a significantly improved multiple injection capability due to a large volume of the high-pressure chamber 8 and lower pressure fluctuations, the missing
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007023384A DE102007023384A1 (en) | 2007-05-18 | 2007-05-18 | Injector for a fuel injection system |
PCT/EP2008/055522 WO2008141918A1 (en) | 2007-05-18 | 2008-05-06 | Injector for a fuel injection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2150696A1 true EP2150696A1 (en) | 2010-02-10 |
EP2150696B1 EP2150696B1 (en) | 2012-02-22 |
Family
ID=39588396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08759421A Not-in-force EP2150696B1 (en) | 2007-05-18 | 2008-05-06 | Injector for a fuel injection system |
Country Status (5)
Country | Link |
---|---|
US (1) | US8418941B2 (en) |
EP (1) | EP2150696B1 (en) |
AT (1) | ATE546635T1 (en) |
DE (1) | DE102007023384A1 (en) |
WO (1) | WO2008141918A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008005532A1 (en) * | 2008-01-22 | 2009-07-23 | Robert Bosch Gmbh | Fuel injector whose control valve element has a support region |
DE102009024596A1 (en) * | 2009-06-10 | 2011-04-07 | Continental Automotive Gmbh | Injection valve with transmission unit |
DE102009024595A1 (en) | 2009-06-10 | 2011-03-24 | Continental Automotive Gmbh | Injection valve with transmission unit |
DE102010001170A1 (en) * | 2010-01-25 | 2011-07-28 | Robert Bosch GmbH, 70469 | Injection device with reduced pressure oscillations |
DE102012110240A1 (en) * | 2012-10-26 | 2014-04-30 | L'orange Gmbh | Fuel injection injector for internal combustion engines |
DE102013013234A1 (en) * | 2013-08-08 | 2015-02-12 | Man Diesel & Turbo Se | Injector for a fuel supply system of an internal combustion engine and fuel supply system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3387790A (en) * | 1967-04-11 | 1968-06-11 | Bosch Arma Corp | Fuel injection nozzle |
US4367846A (en) * | 1979-12-25 | 1983-01-11 | Kawasaki Steel Corporation | Fuel injection valve assembly for internal combustion engines |
US4509691A (en) * | 1982-07-15 | 1985-04-09 | Lucas Industries Public Limited Company | Fuel injection nozzles |
JPS60192872A (en) * | 1984-03-15 | 1985-10-01 | Nippon Denso Co Ltd | Accumulator type fuel injection valve |
US5713520A (en) * | 1995-11-27 | 1998-02-03 | Caterpillar Inc. | Fast spill device for abruptly ending injection in a hydraulically actuated fuel injector |
DE10247903A1 (en) * | 2002-10-14 | 2004-04-22 | Robert Bosch Gmbh | Pressure-reinforced fuel injection device for internal combustion engine has central control line acting on pressure transmission piston |
DE10250722A1 (en) | 2002-10-31 | 2004-05-13 | Robert Bosch Gmbh | Valve for controlling liquids with a pressure medium supply |
-
2007
- 2007-05-18 DE DE102007023384A patent/DE102007023384A1/en not_active Withdrawn
-
2008
- 2008-05-06 US US12/600,771 patent/US8418941B2/en not_active Expired - Fee Related
- 2008-05-06 AT AT08759421T patent/ATE546635T1/en active
- 2008-05-06 WO PCT/EP2008/055522 patent/WO2008141918A1/en active Application Filing
- 2008-05-06 EP EP08759421A patent/EP2150696B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2008141918A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007023384A1 (en) | 2008-11-20 |
WO2008141918A1 (en) | 2008-11-27 |
US20100181392A1 (en) | 2010-07-22 |
US8418941B2 (en) | 2013-04-16 |
EP2150696B1 (en) | 2012-02-22 |
ATE546635T1 (en) | 2012-03-15 |
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