EP3303817A1 - Common-rail-injektor - Google Patents
Common-rail-injektorInfo
- Publication number
- EP3303817A1 EP3303817A1 EP15723543.3A EP15723543A EP3303817A1 EP 3303817 A1 EP3303817 A1 EP 3303817A1 EP 15723543 A EP15723543 A EP 15723543A EP 3303817 A1 EP3303817 A1 EP 3303817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- nozzle
- common rail
- rail injector
- injector 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
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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
-
- 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
- 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
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
Definitions
- the invention relates to a common rail injector according to the preamble of claim 1.
- Such a common rail injector is known from DE 199 36 668 A1 (FIG. 7) of the Applicant.
- the known common rail injector is the
- High-pressure chamber substantially within a nozzle body of the
- a control chamber sleeve is arranged in the area of the nozzle body, in which area the end region of a nozzle needle which is opposite an injection opening is immersed.
- the nozzle needle is by means of a closing or return spring in its closing direction
- the closing spring is supported, on the one hand, against a support ring which bears against a radially encircling collar of the control chamber sleeve and, on the other hand, against a sleeve-shaped element which radially surrounds the nozzle needle.
- the sleeve-shaped element is located at the axial intermediate position of a support ring at a diameter stage of the nozzle needle.
- an axial gap is formed between the mutually facing end faces of the control chamber sleeve and of the element, the size of which depends on the maximum stroke.
- Injector housing extend.
- An Axialhubanschlag by separate or specially designed components as in the aforementioned prior art is not provided in such common rail injectors. Rather, the maximum stroke in such a common-rail injector limited by the fact that the injection opening facing away from the end face of the nozzle needle axially abuts a the control chamber on the side facing away from the nozzle needle side surface of the control chamber.
- the present invention seeks to provide a common rail injector according to the preamble of
- Claim 1 such that the setting of the maximum achievable opening stroke of the nozzle needle is made possible even in relatively long nozzle needles, at the same time an advantageous assembly of the nozzle needle and the directly cooperating with the nozzle components of the
- Characteristics of claim 1 achieved in that the nozzle needle, a second element of the means for adjusting the maximum stroke of the nozzle needle, which comprises the nozzle needle radially and on the first element
- Nozzle needle is arranged axially spaced from the second element.
- Injection opening in the injector housing facing away from the nozzle needle and to arrange the means for limiting the maximum opening stroke of the nozzle needle relatively close to the at least one injection opening in the injector.
- the device for adjusting the maximum stroke of the nozzle needle is arranged in the region of a nozzle body to which at least one further housing element adjoins on the side facing away from the at least one injection opening in the axial direction, and the control chamber is arranged in the region of the further housing element.
- the further housing element with an end face facing the nozzle body forms an axial stop surface for the second element of the device.
- the high-pressure space in the nozzle body and in the further housing element is formed on mutually facing sides of a respective bore portion, wherein the hole formed in the further housing element bore portion for forming the stop surface for the second element has a smaller diameter has as the bore formed in the nozzle body portion, and that the second element has at least one passage for fuel between the two bore portions.
- This passage is therefore of particular importance, since it ensures that an inflow of fuel into the region of the at least one injection opening is made possible even when the nozzle needle is maximally open, in which the second element bears against the end face of the further housing element.
- Nozzle body facing away from the end face of the second element.
- the maximum opening stroke of the nozzle needle is defined by the size of an axial gap formed between the end faces of the two elements.
- Closing spring for applying force to the nozzle needle in its closed position, on the one hand during operation of the common rail injector in an interruption of the control, the nozzle needle to move it to its closed position, and on the other hand to avoid undesirable injection of fuel into the combustion chamber of an internal combustion engine.
- a precise vote of the spring stiffness or the characteristic of the closing spring is required.
- Control chamber dipping end portion of the nozzle needle is limited, and that at maximum opening stroke of the nozzle needle, the two elements are arranged spaced apart to form an axial gap formed between the two elements.
- the two elements thus serve to adjust or exact positioning of the closing spring in relation to
- Nozzle needle and not the limitation of the maximum opening stroke of the nozzle needle.
- the nozzle needle has a radially encircling seat for the first element, against which the first element bears axially, that the second element under axial intermediate position of the return spring adjoins the first element that the movement of the second element is limited by a nozzle module, wherein the nozzle needle is part of the nozzle module, and that the nozzle module forms a pre-assembled into the injector housing, preassembled module.
- the high-pressure chamber is hydraulically connected to an inlet channel for fuel under high pressure, and that the inlet channel opens radially into the high-pressure chamber in an axial region lying between the at least one injection opening and the control chamber.
- Injection opening and the control chamber opens.
- Such an arrangement of the inlet channel to the high-pressure chamber allows an optimized supply of both the control chamber and the region from which fuel flows through the at least one injection port into the combustion chamber of the internal combustion engine.
- FIG. 2 shows a partial region of the common rail injector according to FIG. 1 in FIG
- FIG. 4 is a perspective view of a stop sleeve
- Fig. 5 is provided with the adjusting ring and the stop sleeve
- FIG. 6 shows a comparison with FIG. 2 modified common rail injector
- FIGS. 1 to 4 modified common rail injector in longitudinal section
- Fig. 8 is a used in the common rail injector according to FIG. 7
- Adjustment ring in perspective view
- Fig. 9 is a used in the common rail injector according to FIG. 7
- Stop ring also in perspective view.
- the common rail injector 10 shown in FIG. 1 is used for injecting fuel into the combustion chamber, not shown, of an internal combustion engine, in particular a self-igniting internal combustion engine.
- the injector 10 has an injector housing 11 consisting of several parts.
- the injector housing 1 1 essentially comprises two parts, a nozzle body 12 and a connected to the nozzle body 12 in the axial direction housing member 13, which in practice usually consists of several, also interconnected and in the axial direction
- a high-pressure chamber 18 is formed, which is also formed by a plurality of well portions formed in the nozzle body 12 with different diameters and a plurality of bore portions formed in the housing member 13, also with different
- the high-pressure chamber 18 can be supplied via an inlet channel 19 with fuel under system pressure.
- the inlet channel 19 opens in the illustrated embodiment, approximately in a central region of the high pressure chamber 18 (based on the axial extent of the injector 10), wherein it radially, ie
- a drain passage 22 is formed, which serves for discharging located in a low-pressure region 42 of the injector 10 fuel.
- a nozzle needle 25 in the direction of the double arrow 26 is arranged in a liftable manner in the longitudinal axis 21.
- the at least one formed in the injector 1 1 and the nozzle body 12 is formed
- Injection opening 15 at least indirectly closed to an injection of
- the nozzle needle 25 is part of a nozzle module 30 shown in FIG. 5.
- the nozzle module 30 comprises in the axial direction next to the
- Nozzle needle 25 is still a pin-shaped center piece 31 and a likewise pin-shaped valve piston 32.
- Valve piston 32 are welded together in the transverse direction, in particular by laser welds.
- the nozzle module 30 moreover has a stop sleeve 33 forming a first element of a device 50 for limiting the maximum opening stroke of the nozzle needle 25, a return spring 34 designed as a compression spring and an adjusting ring 35.
- the adjusting ring 35 forms a second element of the device 50 for limiting the maximum opening stroke of the nozzle needle 25 and is completely penetrated or penetrated by the nozzle needle 25 in the axial direction.
- the stop sleeve 33, the return spring 34 and the adjusting ring 35 are at the nozzle needle 25 mounted before the nozzle needle 25 is welded to the center piece 31. Due to the different diameters of the nozzle needle 25 and the central piece 31, the stop sleeve 33, the return spring 34 and the adjusting ring 35 after welding the nozzle needle 25 with the central piece 31 axially captive with said components or the
- Nozzle module 30 is connected, wherein the nozzle module 30 represents a preassembled unit for the injector 10.
- Within the injector housing 11 is on the at least one
- Control chamber sleeve 36 is arranged.
- the control chamber sleeve 36 has, on the side facing the valve piston 32, a blind bore 37, into which the valve piston 32 of the nozzle module 30 with its end region 44 dips.
- end portion 44 is axially spaced from the device 50 and the adjusting ring 35, respectively.
- the valve piston 32 limited within the
- blind hole 37 a control chamber 38 which has an inlet bore 39 to the high-pressure chamber 18 hydraulically connected.
- the control chamber 38 is hydraulically relieved via a formed in the control chamber sleeve 36 through hole 41 in the low pressure region 42 of the injector 10, which in turn is connected to the drain passage 22.
- the through-hole 41 is on the side facing away from the valve piston 32 by means of a spherical valve member 43 in the exemplary embodiment
- valve member 43 The actuation of the valve member 43 is done by way of example, and not limitation, via a Magnetaktuator 45 in a conventional manner and
- Valve member 43 lifts off from the through hole 41, to allow an outflow of fuel from the control chamber 38 in the low pressure region 42 of the injector 10.
- the fuel flowing out of the control chamber 38 also causes, in a known manner, an actuation of the nozzle module 30 or the nozzle needle 25 such that the nozzle needle 25 lifts off its sealing seat to release the at least one injection opening 15.
- Fig. 2 it is shown that the stop sleeve 33, the return spring 34 and the adjusting ring 35 within a bore portion 46 of
- Nozzle body 12 are arranged. At the nozzle body 12 closes in axial direction of the housing member 13, wherein a in the end face 47 of the housing member 13 opening bore portion 48 has a smaller diameter than the bore portion 46 in the region of the adjusting ring 35 and the bore portion 46. Thus, the end face 47 forms for the facing end face of the adjusting ring 35 an axial stop.
- the adjusting ring 35 has, by way of example, three longitudinal slots 49, which are arranged at equal angular intervals relative to one another and which each have a passage for fuel out of the
- Embodiment respectively in side view rectangular longitudinal slots 49 extend over a portion of the length L of the adjusting ring 35, and go from the housing member 13 facing the end face of the adjusting ring 35.
- the nozzle needle 25 radially surrounding stop sleeve 33 has on the
- Adjusting ring 35 facing away from a radially encircling collar 51 which abuts axially on a seat or a shoulder 52 of the nozzle needle 25.
- the return spring 34 is supported between the collar 51 and the return spring 34 facing end face of the adjusting ring 35 from.
- the return spring 34 acts on the nozzle needle 25 or the nozzle module 33 with a spring force such that the nozzle needle 25 in the direction of at least one
- Injection opening 15 is pressed in the direction of the sealing seat.
- the return spring 34 ensures that when the solenoid actuator 45 is de-energized, the nozzle needle 25 always forms the sealing seat in order to prevent fuel from being spiked into the combustion chamber of the internal combustion engine.
- an axial gap 55 is formed between the collar 51 facing away from end face 53 of the stop sleeve 33 and the end face 53 facing end face 54 of the adjusting ring 35.
- the size of the axial gap 55 is adjusted by a variation of the length I of the stop sleeve 33.
- the maximum stroke of the nozzle needle 25 or of the nozzle module 30 in the opening direction is limited by the size of the axial gap 55.
- the end face 54 of the adjusting ring 35 thus forms a stop for the stop sleeve 33 in the opening direction of
- Nozzle needle 25 off.
- the magnet actuator 45 When the magnet actuator 45 is energized and the associated pressure relief of the control chamber 38, the nozzle needle 25 moves counter to the spring force of the return spring 34 in the opening direction until the stop sleeve 33 axially abuts the adjusting ring 35, ie the axial gap 55 is zero. In this position, the reason of the blind hole 37 of the
- Control chamber 38 facing end face of the valve piston 32 is still spaced from the bottom of the blind hole 37.
- the length I of the stop sleeve 33 is selected so small that the maximum opening stroke of the nozzle needle 25 and the nozzle module 30 by a concern of the valve piston 32 at the bottom of the blind bore 37 of the
- Control room 38 takes place. In this case, even at a maximum
- the stop sleeve 33 is still axially spaced from the adjusting ring 35, i. that an axial gap 55 greater than zero is always formed.
- the installation space of the return spring 34 is defined or limited by the dimensioning of the adjusting ring 35 and the stop sleeve 33 so as to provide the required return characteristic or restoring force of
- FIGS. 7 to 9 show a fragmentary illustration of an injector 10a modified with respect to FIGS. 1 to 3.
- the injector 10a has, in addition to the stop sleeve 33, a sleeve-shaped adjusting ring 35a with a constant
- the adjusting ring 35a cooperates with a stop ring 58, which has a centering section 59 projecting into the adjusting ring 35a.
- the adjusting ring 35a has flat, closed end faces. The adjustment of the maximum axial gap 55 can be done by varying the height of the adjusting ring 35 a, wherein the
- Setting ring 35a can be subsequently connected to the nozzle module 30.
- the injector 10, 10a described so far can be modified or modified in many ways, without deviating from the inventive idea.
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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2015/061803 WO2016188577A1 (de) | 2015-05-28 | 2015-05-28 | Common-rail-injektor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3303817A1 true EP3303817A1 (de) | 2018-04-11 |
| EP3303817B1 EP3303817B1 (de) | 2020-12-16 |
Family
ID=53189847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15723543.3A Active EP3303817B1 (de) | 2015-05-28 | 2015-05-28 | Common-rail-injektor |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3303817B1 (de) |
| WO (1) | WO2016188577A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0932683A (ja) * | 1995-07-14 | 1997-02-04 | Isuzu Motors Ltd | 内燃機関の燃料噴射装置 |
| DE19839632A1 (de) * | 1998-08-31 | 2000-03-02 | Siemens Ag | Kraftstoffeinspritzdüse mit Hubbegrenzung |
| DE19936668A1 (de) | 1999-08-04 | 2001-02-22 | Bosch Gmbh Robert | Common-Rail-Injektor |
| DE10152268A1 (de) * | 2001-10-20 | 2003-04-30 | Bosch Gmbh Robert | Einspritzventil |
| JP2006274942A (ja) * | 2005-03-29 | 2006-10-12 | Bosch Corp | 燃料噴射弁 |
| DE102006050065A1 (de) * | 2006-10-24 | 2008-04-30 | Siemens Ag | Fluiddosiervorrichtung |
| DE102008035087B4 (de) * | 2008-07-28 | 2015-02-12 | Continental Automotive Gmbh | Einspritzventil |
| DE102011078429A1 (de) * | 2011-06-30 | 2013-01-03 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
-
2015
- 2015-05-28 EP EP15723543.3A patent/EP3303817B1/de active Active
- 2015-05-28 WO PCT/EP2015/061803 patent/WO2016188577A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP3303817B1 (de) | 2020-12-16 |
| WO2016188577A1 (de) | 2016-12-01 |
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