CN106939863A - A kind of fuel oil injector equipped with metering servovalve - Google Patents
A kind of fuel oil injector equipped with metering servovalve Download PDFInfo
- Publication number
- CN106939863A CN106939863A CN201710296653.2A CN201710296653A CN106939863A CN 106939863 A CN106939863 A CN 106939863A CN 201710296653 A CN201710296653 A CN 201710296653A CN 106939863 A CN106939863 A CN 106939863A
- Authority
- CN
- China
- Prior art keywords
- metering
- control
- metering servovalve
- matching parts
- needle shaft
- 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
- F02M61/04—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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
Abstract
A kind of fuel oil injector equipped with metering servovalve disclosed by the invention, injector nozzle matching parts including nozzle holder and installed in nozzle holder bottom and the metering servovalve in fuel injection housing body, metering servovalve is opened by the drive magnetic valve installed in nozzle holder top, metering servovalve drives injector nozzle matching parts to open and close during open and close, connected between the Needle shaft upper end in control-rod lower end and injector nozzle matching parts in its metering servovalve using flexible way, and flexible way connection is at least so that the control-rod in metering servovalve is in the moving directions of X Y two and X, Y-axis is free around direction of rotation.Using flexible way connection between the Needle shaft upper end in control-rod lower end and injector nozzle matching parts in the metering servovalve of the present invention, movement interference is reduced to greatest extent and internally-damped, moving up and down the Needle shaft in injector nozzle matching parts, precision is higher, and minimum oil volume control performance is more preferable.
Description
Technical field
The present invention relates to a kind of fuel oil injector equipped with metering servovalve.
Background technology
The fuel oil injector sprayed for fuel of internal combustion engine generally comprises nozzle holder and under nozzle holder
The injector nozzle matching parts in portion and the metering servovalve in fuel injection housing body, metering servovalve pass through installed in fuel injection housing
The drive magnetic valve on body top is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close.
Usually from common rail pipe high pressure fuel by fuel inlet fitting introduce fuel injection housing body in after, be divided into two-way, a-road-through
The mesopore inner chamber crossed in fuel injection housing body directly reaches the atomizer end in injector nozzle matching parts, to be sprayed；Another road is entered
Control chamber in metering servovalve.When fuel oil injector does not work, by accurately calculating, the control chamber in metering servovalve
The hydraulic coupling of generation is transferred to the Needle shaft in injector nozzle matching parts by the control-rod in metering servovalve, makes Needle shaft lower end
Conical sections are pressed on the internal conical surface in needle-valve body and sealed, fuel oil injector not oil spout.
Electromagnet as now given in drive magnetic valve is powered, and is opened by the electromagnet executive component in drive magnetic valve
Metering servovalve so that the control chamber pressure in metering servovalve declines, and the Needle shaft in injector nozzle matching parts is in upward fluid power
Moved up under promotion, the conical sections of Needle shaft lower end is departed from the internal conical surface in needle-valve body, open under needle-valve body
The atomizer passage at end, to the fuel oil of engine chamber jet atomization.
To realize that the Needle shaft in the control-rod and injector nozzle matching parts in above-mentioned functions, the metering servovalve of concatenation must lead to
Cross accurate calculate and reach axial spring forces, the balance of hydraulic coupling, wherein mostly hydraulic coupling.Due in metering servovalve
Needle shaft in control-rod and injector nozzle matching parts is required for strict hydraulic packing, therefore, the control-rod in metering servovalve and
The radial direction or end face seal key element that take various forms is needed to be combined in Needle shaft structure design in injector nozzle matching parts
Sealing.
As engine combustion requires that fuel oil injector injecting times are more and more, up to 9 times, emitted dose stability is added
It is required that more and more higher, movement response speed is more and more faster, this is required in control-rod and injector nozzle matching parts in metering servovalve
Needle shaft open and closing motion (rise and decline) is stable, quick, kinetic damping is the smaller the better, therefore the metering of concatenation is watched
Take the Needle shaft in control-rod and injector nozzle matching parts in valve and sealing Combination Design be movement parts moving-mass key.
To reach that the Needle shaft in the control-rod and injector nozzle matching parts in metering servovalve is typically designed to by above-mentioned purpose
It is overall, but manufacturability is poor, and industrial production cost is high.Therefore it is reduction industrial production cost and the manufacturability of raising processing,
The Needle shaft in control-rod and injector nozzle matching parts in metering servovalve is broken generally into two parts and uses various connected modes
It is attached, a kind of electromagnetic measurement for fuel nozzle as disclosed in Chinese invention patent Authorization Notice No. CN1096549C
Control-rod in valve, metering servovalve therein is connected by one grade of disk with the Needle shaft in injector nozzle matching parts.This connection side
Formula easily causes movement interference and internally-damped so that the Needle shaft mobile accuracy in injector nozzle matching parts declines.
Needle shaft in injector nozzle matching parts needs good guidance quality in needle-valve body, and Needle shaft can only be in needle-valve body
Axially move up and down and rotated around axial line, other frees degree are limited, the control-rod in metering servovalve to ensure concatenation
With the allomeric function of the Needle shaft in injector nozzle matching parts, the control-rod in metering servovalve must be set using floating sealing structure
Meter, greatly reduces the chance of failure of cost and industrialized production part.
The content of the invention
It is an object of the invention to for the above-mentioned technology present in the existing fuel oil injector in fuel of internal combustion engine injection
Problem and a kind of fuel oil injector equipped with metering servovalve is provided.This equipped with metering servovalve fuel oil injector with letter
Single economic mode solves the above problems, while unnecessary floating seal link is reduced, reduction manufacture upper part failure risk.
In order to realize foregoing invention purpose, the technical solution adopted in the present invention is as follows：
A kind of fuel oil injector equipped with metering servovalve, including nozzle holder and installed in nozzle holder bottom
Injector nozzle matching parts and the metering servovalve in fuel injection housing body, metering servovalve passes through installed in nozzle holder
The drive magnetic valve on top is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close, its
It is characterised by, using soft between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in the metering servovalve
Property mode connect, and flexible way connection at least so that control-rod in the metering servovalve in the moving directions of X-Y two and
X, Y-axis are free around direction of rotation.
In a preferred embodiment of the invention, the control-rod lower end in the metering servovalve and the fuel injection nozzle matching
Connected between Needle shaft upper end in part by a flexible boot.
In a preferred embodiment of the invention, the control-rod lower end in the metering servovalve and the fuel injection nozzle matching
Needle shaft upper end diameter in part is identical.
In a preferred embodiment of the invention, the endoporus of the flexible boot and the control-rod in the metering servovalve
Gapless or gap very little between Needle shaft upper end in lower end, the injector nozzle matching parts, to ensure in the metering servovalve
Control-rod lower end end face and the injector nozzle matching parts in Needle shaft upper end end face between the sealed volume pressure value that is formed
Less than 10bar.
In a preferred embodiment of the invention, the control-rod lower end in the metering servovalve and the atomizer
Be provided with ring recess on Needle shaft upper end in couple, make control-rod lower end in the flexible boot and the metering servovalve,
Sealed between Needle shaft upper end in the injector nozzle matching parts more preferable.
In a preferred embodiment of the invention, the control-rod lower end afterbody in the metering servovalve is provided with circular arc
Face, to eliminate because swinging the interference produced.
Servo is measured due to using in technical scheme as above, the fuel oil injector of the invention equipped with metering servovalve
Connected between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in valve using flexible way, to greatest extent
Reduce movement interference and internally-damped, moving up and down the Needle shaft in injector nozzle matching parts, precision is higher, and minimum oil volume is controlled
Performance is more preferable.
Brief description of the drawings
Fig. 1 is structural representation of the present invention equipped with the fuel oil injector of metering servovalve.
Fig. 2 is enlarged diagram at Fig. 1 I.
Embodiment
Referring to Fig. 1 and Fig. 2, the fuel oil injector equipped with metering servovalve shown in figure includes a nozzle holder
2, there is high pressure fuel oil inlet passage 3 side on the top of nozzle holder 2, and opposite side is provided with drainback passage 24；Nozzle holder 2
Inside it is provided with metering servovalve external volume 5.Fuel inlet fitting 30 is installed on high pressure fuel oil inlet passage 3.
Metering servovalve 7 is housed in nozzle holder 2, the metering servovalve 7 is by valve pocket 14, control-rod back-moving spring 6a
And control-rod 6 is constituted.
Valve pocket 14 is positioned by step 16 and cylindrical section 17 with the opposite site of nozzle holder 2.Whole metering servovalve 7 is used
Plug screw 18 is pressed abd fixed in nozzle holder 2, and now control-rod 6 can only be moved up and down and around axis rotation vertically.Control
Bar 6 resets by control-rod back-moving spring 6a.
Middle part in valve pocket 14 is arranged below a functional hole 13 being connected with the upper end of control-rod 6, and the upper end of control-rod 6 is inserted
Enter into the functional hole 13, functional hole 13 enables the hole of 6 opposing valve sleeves of control-rod 14 to move axially, while can guarantee that work(again
It can be sealed between hole 13 and control-rod 6.
By the part-circular periphery face of the top surface of the upper end of control-rod 6, the hole top surface of functional hole 13 and functional hole 13 define Lai
Control room volume 15 and the pressure of metering valve external volume 5 it is independent.Control room volume 15 passes through the oil-feed that is arranged on valve pocket 14
Dip hatch 8 is communicated with the high pressure fuel oil inlet passage 3 in nozzle holder 2, while control room volume 15 is also by being arranged on valve
Oil measurement hole 9 of removing heat by catharsis on set 14 is communicated with drainback passage 24.
Ball 31a in one drive magnetic valve 31, drive magnetic valve 31 is installed on the top of nozzle holder 2 in driving electricity
When magnet valve is powered, unlatching is removed heat by catharsis oil measurement hole 9, and the oil measurement hole 9 that makes to remove heat by catharsis is communicated with drainback passage 24.If drive magnetic valve is broken
When electric, ball 31a in drive magnetic valve 31 removes heat by catharsis closing oil measurement hole 9, the oil measurement hole 9 that makes to remove heat by catharsis with drainback passage 24 not
Communicate.
Injector nozzle matching parts 23 is connected with by nozzle cap nut 20 in the lower axial end of nozzle holder 2.Injector nozzle matching parts 23
Be made up of needle-valve body 4 and Needle shaft 9, the end face 22 and outside cylinder 21 of needle-valve body 4 by with nozzle cap nut 20 and fuel injection housing
The bottom surface of body 2 is positioned and fixed.
There are one section of cylinder engagement section 13a, cylinder engagement section 13a to cause Needle shaft 9 between Needle shaft 9 and needle-valve body 4
The relative needle-valve body 4 of energy is moved axially, while cylinder engagement section 13a gap sealing is can guarantee that again, the lower end of Needle shaft 9
Conical sections 25 are sealed with the internal conical surface 26 in needle-valve body 4, and sealed diameter is d in diagram.Therefore Needle shaft 9 can be in needle-valve
Moved axially up and down in body 4, be moved down into the conical sections 25 of the lower end of Needle shaft 9 and the internal conical surface 26 in needle-valve body 4
Untill coincidence.The bottom of needle-valve body 4 is provided with nozzle opening 32.
The upper end 27 of Needle shaft 9 is identical with the diameter of lower end 28 of control-rod 6, is connected with flexible boot 10, flexible boot 10 it is interior
Hole coordinates with the upper end 27 of Needle shaft 9, the lower end 28 of control-rod 6, and between the endoporus of flexible boot 10 and the upper end 27 of Needle shaft 9
Abutting end 12, abutting end 12a gap very littles or gapless between the lower end 28 of the endoporus of flexible boot 10 and control-rod 6, with
Ensure that the termination of upper end 27 of Needle shaft 9 forms the pressure of sealed volume 11 with the termination of lower end 28 of control-rod 6 because of structural design
It is worth very little (such as less than 10 bars).
With the injection pressure more and more higher of engine calls, No leakage structure design will be generally used, it is illustrated that allusion quotation
Type No leakage structure is that the inner chamber of metering valve external volume 5 in nozzle holder 2 and needle-valve body 4 is fuel injector injection work
Pressure, the component that control-rod 6 is constituted with Needle shaft 9 is placed in injection high pressure.
Injector nozzle matching parts 23, according to the oil spout of fuel oil injector need of work or stopping, is upward by Needle shaft 9 therein
Movement moves down compression seal line d come what is realized, and with engine emission requirements more and more higher, refinement is wanted in each oil spout
Really, it is desirable to which needle-valve shift position is accurately and repetition stability is good in whole work process.
Control-rod 6 and Needle shaft 9 are divided into two pieces by the present invention for reduction manufacturing cost, are flexibly connected with flexible boot 10.Extremely
Less so that the control-rod 6 in metering servovalve 7 is free around direction of rotation in the moving directions of X-Y two and X, Y-axis.
The component that Needle shaft 9 is constituted with control-rod 6, one end is connected with control room volume 15, one end and injector nozzle matching parts 23
In the nozzle bore 32 of the bottom of needle-valve body 4 connect, stress is extremely complex, it is necessary to which precise control is axially in practical work process
It is mainly hydraulic coupling in power, axial force, to reduce governing factor, the F in design only in control figure is (by the pressure of control room volume 15
Produce) and f (being produced by the sealed section d of Needle shaft 9), when carrying out fuel injector design, the power is calculated and verified by accurate
, do not allow to produce axial additional force.
Meanwhile, the Needle shaft 9 and control-rod 6 connected by flexible boot 10 can reduce movement interference to greatest extent during work
And it is internally-damped, moving up and down part component, precision is higher, and minimum oil volume control performance is more preferable.
To play above-mentioned effect, on the upper end 27 of Needle shaft 9 and the lower end 28 of control-rod 6 design go too far groove 19,
19a, makes upper end 27 and lower end 28 better tightness of control-rod 6 of the flexible boot 10 with Needle shaft 9.
Meanwhile, to swing rod member, arc surface 29 is designed in the breech face of control-rod 6, is eliminated because swinging the interference produced.
Claims (6)
1. a kind of fuel oil injector equipped with metering servovalve, including nozzle holder and installed in nozzle holder bottom
Injector nozzle matching parts and the metering servovalve in fuel injection housing body, metering servovalve pass through on nozzle holder
The drive magnetic valve in portion is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close, and it is special
Levy and be, using flexibility between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in the metering servovalve
Mode is connected, and flexible way connection is at least so that the control-rod in the metering servovalve is in the moving directions of X-Y two and X, Y
Axle is free around direction of rotation.
2. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 1, it is characterised in that the metering is watched
Take and connected by a flexible boot between the Needle shaft upper end in the control-rod lower end and the injector nozzle matching parts in valve.
3. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the metering is watched
The control-rod lower end taken in valve is identical with the Needle shaft upper end diameter in the injector nozzle matching parts.
4. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the flexible boot
Endoporus and the metering servovalve in control-rod lower end, between the Needle shaft upper end in the injector nozzle matching parts gapless or
On gap very little, the Needle shaft in end face and the injector nozzle matching parts to ensure the control-rod lower end in the metering servovalve
The sealed volume pressure value formed between the end face of end is less than 10bar.
5. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that in the metering
Ring recess is provided with the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in servo valve.
6. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the metering is watched
The control-rod lower end afterbody taken in valve is provided with arc surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710296653.2A CN106939863B (en) | 2017-04-28 | 2017-04-28 | Fuel injector equipped with metering servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710296653.2A CN106939863B (en) | 2017-04-28 | 2017-04-28 | Fuel injector equipped with metering servo valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106939863A true CN106939863A (en) | 2017-07-11 |
| CN106939863B CN106939863B (en) | 2022-05-17 |
Family
ID=59464365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710296653.2A Active CN106939863B (en) | 2017-04-28 | 2017-04-28 | Fuel injector equipped with metering servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106939863B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327509A (en) * | 1999-11-12 | 2001-12-19 | 罗伯特·博施有限公司 | Fuel injection valve |
| US20080149744A1 (en) * | 2006-11-09 | 2008-06-26 | Martin Mueller | Fuel injector |
| CN101614175A (en) * | 2008-06-27 | 2009-12-30 | C.R.F.索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | The fuel injector that is used for internal-combustion engine with high stability of operation |
| DE102008040108A1 (en) * | 2008-07-03 | 2010-01-07 | Robert Bosch Gmbh | Valve e.g. injecting valve, for use in e.g. fuel injecting system, has valve housing, valve seat carrier, valve needle with valve closure unit, and valve closure spring, where one of above components is made of fiber-reinforced material |
| CN201486716U (en) * | 2009-05-18 | 2010-05-26 | 山东菏泽华星油泵油嘴有限公司 | Flexible needle valve spray nozzle coupler |
| CN103644057A (en) * | 2013-12-30 | 2014-03-19 | 南岳电控(衡阳)工业技术有限公司 | Fuel injector capable of injecting fuel to engine quantitatively at fixed time in controllable manner |
| CN206681895U (en) * | 2017-04-28 | 2017-11-28 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of fuel oil injector equipped with metering servovalve |
-
2017
- 2017-04-28 CN CN201710296653.2A patent/CN106939863B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327509A (en) * | 1999-11-12 | 2001-12-19 | 罗伯特·博施有限公司 | Fuel injection valve |
| US20080149744A1 (en) * | 2006-11-09 | 2008-06-26 | Martin Mueller | Fuel injector |
| CN101614175A (en) * | 2008-06-27 | 2009-12-30 | C.R.F.索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | The fuel injector that is used for internal-combustion engine with high stability of operation |
| DE102008040108A1 (en) * | 2008-07-03 | 2010-01-07 | Robert Bosch Gmbh | Valve e.g. injecting valve, for use in e.g. fuel injecting system, has valve housing, valve seat carrier, valve needle with valve closure unit, and valve closure spring, where one of above components is made of fiber-reinforced material |
| CN201486716U (en) * | 2009-05-18 | 2010-05-26 | 山东菏泽华星油泵油嘴有限公司 | Flexible needle valve spray nozzle coupler |
| CN103644057A (en) * | 2013-12-30 | 2014-03-19 | 南岳电控(衡阳)工业技术有限公司 | Fuel injector capable of injecting fuel to engine quantitatively at fixed time in controllable manner |
| CN206681895U (en) * | 2017-04-28 | 2017-11-28 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of fuel oil injector equipped with metering servovalve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106939863B (en) | 2022-05-17 |
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