CN106050501B - High reliability Electrocontrolled high-pressure fuel injection equipment (FIE) - Google Patents

Abstract

High reliability Electrocontrolled high-pressure fuel injection equipment (FIE) disclosed by the invention, it is desirable to provide a kind of good heat dissipation effect, dynamic response are rapider, the more accurate fuel injection equipment (FIE) of fuel injection amount.The technical scheme is that：The valve seat opening cone angle A angles of the tapered opening of valve seat (12) are more than the angle of the valve rod truncated cone cone angle B, have annular gap between matched cylindrical surface between the necking down of valve rod (4) cone lower end and valve seat (12) upper end tapered opening to be formed；Iron core (3) top is formed with the cylinder table omoplate for allowing iron core upper end compression position far from electromagnet main flux by path, it is contacted with inner frame (1) lower face on the upper surface of iron core, lower end opens up downwardly open annular groove, it is equipped with the coil (5) coated by coil rack (51) in the annular groove, stays that there are one the gaps expanded for coil rack at the top of coil rack and iron core annular groove.

Description

High reliability Electrocontrolled high-pressure fuel injection equipment (FIE)

Technical field

A kind of Electrocontrolled high-pressure fuel injection equipment (FIE) being mainly used for high-pressure common rail oil supply system of the present invention.Automatically controlled height Pressure fuel injection equipment (FIE) is commonly called as " electric-controlled fuel injector ".

Background technology

Electrocontrolled high-pressure common rail oil supply system is current state-of-the-art fuel system for diesel engine.With adopted on a diesel engine in the past All automatically controlled oil supply systems, such as electronically controlled unit pump, electrically-controlled pump nozzle, electronic control dispensing pump are compared, and there are three most important Feature.First, because injection pressure and engine speed are decouplings, injection pressure is unrelated with engine speed, no matter so hair Which kind of operating mode Electrocontrolled high-pressure common rail spraying system is motivation, which be operated in, can provide best injection pressure；Second is that high-pressure oil pump will It is sent into a common high pressure oil rail, then by this common high pressure oil rail is delivered to high pressure fuel each after fuel oil compression The Electrocontrolled high-pressure fuel injection equipment (FIE) of cylinder can be such that the Electrocontrolled high-pressure fuel injection equipment (FIE) of each cylinder is pressed in identical injection It is sprayed under power；Third, can be according to the requirement of efficiency of combustion, pollutant emission and comfort etc. in a working cycles Realize multi-injection.These features of Electrocontrolled high-pressure common rail spraying system are previous all fuel feeding systems used on a diesel engine Not available for system, therefore Electrocontrolled high-pressure common rail spraying system becomes the first choice of diesel engines at present oil supply system.Electrocontrolled high-pressure is total Rail oil supply system is mainly by controller, that is, electronic control unit, that is, ECU, Electrocontrolled high-pressure oil pump, high pressure oil rail（I.e. so-called " common rail "）, electricity Control the compositions such as high-pressure injection device, sensor.The control software write is stored in ECU according to the needs of engine operating condition. The real-time working condition parameter for the engine that engine detects the wish of driver and sensor when working is such as：Rotating speed, load, The information inputs ECU such as temperature, pressure sends instructions to Electrocontrolled high-pressure oil pump, high pressure oil rail, automatically controlled according to the operation result of ECU High-pressure injection device, to control the oil mass of Electrocontrolled high-pressure oil pump output, pressure, Electrocontrolled high-pressure injection apparatus start injection when Carve, the duration of injection, the number etc. that sprays in a cycle, at the same time ECU may also participate in the operational management of automobile. Because the rotating speed of engine is very high, it is desirable that the dynamic response of control system must quickly, usually with microsecond meter, so being obtained from ECU Start to must adapt to the requirement of engine up to the stopping fuel oil injection time used to input instruction.Wherein the operation of ECU with And the speed of electric signal transmission is that there is no problem, key is the speed of the speed of actuator.Actuator belongs to power device, Requirement in terms of being limited to volume, heat dissipation and size due to device itself cannot be made very big, the thus promotion of driving power It is restricted, in addition to this quality of possessed movement of metallic part, spring etc. is larger in structure, while the also resistances such as hydraulic coupling The influence of Buddhist nun's factor makes the time that actuator occupies relatively will be to much longer, therefore the response speed for improving actuator becomes electricity Control the key of common-rail injection system.In addition, just since actuator is a power device, efficiency and reliability etc. also at For the technological difficulties of the system.

Electrocontrolled high-pressure fuel injection equipment (FIE) is the actuator of Electrocontrolled high-pressure common rail oil supply system, includes mainly：By electromagnet Preposition control unit that component and control valve group are constituted, the fluid power amplifier unit being made of piston bush and piston rod etc., by needle The fuel oil injecting-unit of the compositions such as valve and needle-valve body, provided for Electrocontrolled high-pressure fuel injection equipment (FIE) high-low pressure fuel oil runner, filtering, The parts compositions such as the electric-controlled fuel injector ontologies of functions, oil intake assembly, fastening swivel nut such as seal and connect firmly.

In the prior art, Electrocontrolled high-pressure fuel injection equipment (FIE) includes mainly：By electromagnet assembly and control valve group structure At preposition control unit, be made of piston bush and piston rod etc. fluid power amplifier unit, be made of needle-valve and needle-valve body etc. Fuel oil injecting-unit such as provides high-low pressure fuel oil runner, filtering for Electrocontrolled high-pressure fuel injection equipment (FIE), seals and connect firmly at the functions Ontology, oil intake assembly, fastening swivel nut etc. parts composition.Preposition control unit, fluid power amplifier unit, injecting-unit are all made of With 38 arranged concentric of electric-controlled fuel injector ontology, the assemble sequence of parts is as described below, the electromagnetism that preposition control unit is included Iron component and control valve group are stacked in 38 top of electric-controlled fuel injector ontology, wherein get out of a predicament or an embarrassing situation plane and the automatically controlled spray of valve seat 12 The center vessel plane contact of oily device ontology 38, forms a ring-type into oil groove between valve seat 12 and electric-controlled fuel injector ontology 38, Ring-type is sealed using the radial seal mode of sealing ring 20 at the high pressure fuel in oil groove in the lower part at oil groove, seals lining papers Pad 21 serves as a contrast 20 support of sealing ring on the step of electric-controlled fuel injector ontology 38, and the material of the sealing ring 20 is plastic material, no Only intensity is low, sealing effect is poor, the problem of degeneration there is also leakproofness.The top of the center vessel of valve seat 12 is that a taper is opened Mouthful, the upper plane of valve seat 12 closed assembly gasket 13 successively, guide sleeve 14, and by fastening swivel nut 15 at 38 center of electric-controlled fuel injector ontology Vessel is got out of a predicament or an embarrassing situation in plane, and the lower face of electromagnet housing 9 is connected in by fastening swivel nut 10 in electric-controlled fuel injector ontology 38 In the top bar plane of heart vessel, iron core 3 is mounted concentrically in 9 center vessel of electromagnet housing, lower face and electromagnet housing Inner cavity step cutting pattern face contacts, and upper surface is contacted with the lower plane of inner frame 1, and being closed up by 9 upper end of magnet electromagnetic iron-clad body will Iron core 3 is pressed between inner frame 1 and electromagnet housing 9, and result makes the prodigious erection stress that the outer barrel of iron core 3 generates, The serious magnetic permeability for influencing iron core 3, to make the efficiency of electromagnet substantially reduce.It is built-in in the downwardly open groove of iron core 3 Equipped with the coil 5 coated by coil rack 51,5 conducting wire both ends of coil are connected with power supply respectively by connecting bar 54.Ball sealer 16, Sealed ball seat 17, valve rod 4, electromagnet spring 2 are stacked in the tapered opening of valve seat 12 and the center vessel port of inner frame 1 successively Between, ball sealer 16 and the tapered opening of valve seat 12 form band, and valve rod 4 is a ladder rotary body, when valve rod is transported upwards It plays the top of end disc by the position-limiting action of the backstop boss 22 on guide sleeve 14 when dynamic, and valve rod moves upwards control valve and beats It opens, the high pressure fuel from high pressure oil outlet 19 flows to low pressure chamber 55, and valve rod falls then control valve closing, comes from high pressure oil outlet 19 high pressure fuel is truncated.The upper surface of armature 6 and the lower face of the opening gasket 46 for the card slot for being installed in valve rod 4 connect It touches, damping spring 7 is supported between guide sleeve 14 and armature 6." O " shape sealing ring 52 is mounted between inner frame 1 and connecting bar 54 It seals.After energization, by connecting bar 54, the both ends of coil 5 are connected to, have electric current to flow through in coil 5, in iron core 3 In just produce magnetic field, air-gap of the magnetic field across iron core 3 and armature 6 so that armature 6 acquisition so that it is moved upwards Electromagnetic force, when electromagnetic force is more than the spring force of electromagnet spring 2, armature 6 can overcome spring force to move upwards, and coil is disconnected After electricity, electromagnetic force disappears, and armature 6 returns in situ again under the action of electromagnet spring 2.

In prior art fluid power amplifier unit shown in Fig. 2, fluid power amplifier unit includes：It is concentrically mounted on electronic control injection The valve seat 12 of the multistage outer diameter of the effect for having both piston bush in the center vessel of device ontology 38, during 12 lower part of valve seat is possessed Heart vessel is matched with the piston rod 42 of multistage outer diameter, concentric between 42 lower end of piston rod and 30 upper surface of needle-valve to install a needle Lift of a valve adjusting pad 27, by determining that adjustment needle is played in the gap in 42 upper surface of piston rod and 12 valve seats between vessel lower face The effect of the lift of a valve.

Fuel oil injecting-unit shown in Fig. 2 is used in the prior art, including：Have with concentric multi-grade outer diameter and lower end The needle-valve body 29 of spherical-like morphology is connected firmly by fastening swivel nut 28 on the lower plane of electric-controlled fuel injector ontology 38, on 29 center of needle-valve body There are two circular shape holes for system with one heart in portion, and a scrotiform oil holding slot is made with one heart among upper described two circular shape holes, A taper valve port is made in described two circular shape holes lower end with one heart, an aperture is connected below taper valve port, in institute It states and is formed with several radial spray orifices 34 at aperture, being formed with inclined hole 31 in the side of the scrotiform oil holding slot passes straight through to upper surface, With concentric multi-grade outer diameter and lower end, the needle-valve 30 with cone form is concentrically mounted in 29 center vessel of needle-valve body, described The cone of 30 lower end of needle-valve matches with the taper valve port of 29 lower end of needle-valve body and the sealing of guarantee high pressure fuel, the needle-valve There are annular gaps 33 for 30 lower part round diameters circular hole corresponding with needle-valve body 29, can make the height from electric-controlled fuel injector ontology 38 The high pressure fuel of pressure oil-through-hole 41 is via the inclined hole 31, scrotiform oil holding slot, annular gap 33 of needle-valve body 29 until 30 lower end of needle-valve Cone and 29 lower end of needle-valve body taper valve port match and sealing position at.In the upper end shoulder of needle-valve 30 and one Spring spool 26 contacts, and the upper plane of oil nozzle spring adjusting pad 24 is contacted with 38 lower cavity step surface of electric-controlled fuel injector ontology, Oil nozzle spring 25 installation be supported between 26 top of spring spool and the lower plane of oil nozzle spring adjusting pad 24, oil nozzle spring 25 to Under elastic force seal to needle-valve.

Oil intake assembly as shown in Figure 2 is used in the prior art, including：External both ends are screw thread and have center vessel Oil inlet bolt 36, the center vessel close-fitting of oil inlet filter element 35 and oil inlet bolt 36 closes the effect of filter fuel impurity, One end of oil inlet bolt 36 connects firmly in the screw hole that 38 upper side of electric-controlled fuel injector ontology is made, oil inlet bolt 36 with it is automatically controlled Oil inlet bolt gasket 37 between injector body 38 seals to high pressure fuel, and the other end of oil inlet bolt 36 passes through High-pressure oil pipe is connected with high pressure oil rail, and the high pressure fuel from high pressure oil rail enters back into automatically controlled after oil inlet bolt and filter element filtering The high pressure oil-through-hole 41 of injector body 38 provides high pressure fuel for Electrocontrolled high-pressure injection apparatus.

When work, coil switch power, the air gap between iron core 3 and armature 6 generates magnetic flux, and armature 6 is made to generate upwards Electromagnetic force overcome the spring force of valve rod spring 2 that valve rod 4 is made to move upwards, ball sealer 16, sealed ball seat 17 are by from into whelk Bolt, the inclined oil hole of air at 38 upside position of electric-controlled fuel injector ontology, high pressure fuel feed hole 18, high pressure oil outlet 19 high pressure fuel rush, High pressure fuel flows to low pressure chamber 55 via the low pressure oil return hole 23 of guide sleeve so that in the vessel between valve seat 12 and piston rod 42 Rapid pressure drop, and via the inclined oil hole of air at the upside position of electric-controlled fuel injector ontology 38, the height of electric-controlled fuel injector ontology 38 Pressure oil-through-hole 41, needle-valve body oil holding slot 32, makes high pressure fuel in the mesoporous of needle-valve body lower part at the high pressure fuel feed hole 31 of needle-valve body 29 To the upward hydraulic coupling that needle-valve 30 generates, which overcomes the spring force of oil nozzle spring 25 that needle-valve is made to lift, then high pressure fuel Fuel oil is sprayed outward by the spray orifice 34 of the gap of needle-valve and the seat surface of needle-valve body, needle-valve body.

After electromagnet power-off, electromagnetic force disappears, and ball sealer is taken a seat under the action of valve rod spring, and high pressure fuel is cut off, The pressure in vessel between valve seat 12 and piston rod 42 increases rapidly, and piston rod 42 is pushed to move downward up to closing needle-valve, End of injection.

The deficiency of the electromagnet assembly of the prior art as shown in Figure 2 is that the lower face of iron core 3 is located at electromagnet In the inner cavity seam allowance plane of shell 9, the upper surface of iron core 3 is contacted with inner frame 1, is closed up iron core 3 by 9 upper end of electromagnet housing It compresses, result makes the prodigious erection stress that the outer barrel of iron core 3 generates, the serious magnetic permeability for influencing iron core 3, to make electricity The efficiency of magnet substantially reduces.

The shortcoming of the electromagnet assembly of the prior art as shown in Figure 2 also resides in, electromagnet at work, in iron Core inner will generate eddy current, and coil itself can also generate heat, will be to work of electromagnet if these heats cannot shed in time Reliability generates strong influence, electromagnet can be burnt when serious, the iron core 3 of the prior art can only be by between armature and iron core The fuel oil that clearance flow is crossed then flows into the endoporus heat dissipation of iron core, since the gap between iron core 3 and armature 6 only has 0.1mm and is holding in the mouth The gap, which also constantly reduces, during iron moves causes the circulating resistance of fuel oil very big, the iron core 3 of the prior art External cylindrical surface there is no fuel oil to flow through, and the circulation area of 3 endoporus of the iron core only has the 13% of outer circle area, it is clear that only passes through Endoporus heat dissipation cannot get good heat dissipation effect, therefore can be had an impact to the reliability of electromagnet.

The third deficiency of the electromagnet assembly of the prior art is that coil rack 51 and the top of 3 groove of iron core do not have Preset clearance, when work of electromagnet the coil and skeleton all can fever expansion, because of the space of the reserved expansion in upper end, line The bottom surface of ring framework can only move down, and the normal neutral plane of the coil and skeleton also moves down therewith, when electromagnet stops Only work it is cooling after, the coil and skeleton understand cooling meat again, and contraction at this time is no longer to revert to original position, but the coil It bounces back simultaneously to its normal neutral plane with the both ends of skeleton, after electromagnet expands with heat and contract with cold repeatedly by long-term work, causes line Ring framework whole will gradually downward move, lower face also will displacement gradually downward therewith, the bottom surface of coil rack is once higher by The low degree of iron core will influence the work of electromagnet, can drag to pull while more seriously the coil and skeleton move down and lead Line, pulling apart conducting wire when serious makes electromagnet fail.

4th deficiency of the electromagnet assembly of the prior art is there was only one between inner frame 1 and electromagnet housing 9 A " O " shape sealing ring 52, the sealing ring belong to extra small diametric seal, in pressure because the connecting bar diameter sealed only has 1mm Oil leak is easy to happen when fluctuating larger.

The deficiency of the control valve group of the above-mentioned prior art is, in 16 down periods of ball sealer, the ball sealer 16 begins It is acted on eventually by high pressure fuel hydraulic coupling, needing electromagnet spring to have prodigious spring force just and can push down ball sealer 16 makes its seat It falls on the circular conical surface of valve seat 12, it is thus necessary to make electromagnet spring force increase, electromagnet spring force is a closing forces, electromagnetism It just necessarily requires electromagnetic force on armature 6 also and then to increase to open after the increase of iron spring force, thus makes driving power consumption significantly Increase.

Meanwhile the control valve group of the prior art also has more distinct issues to be, ball sealer 16 open before due to by To the effect of high pressure fuel hydraulic coupling, control valve is opened, the magnetic field force needed is relatively small, and high pressure fuel is to close once opened The active force of blocking 16 reduces much suddenly at once, and the resultant force for opening ball sealer reduces suddenly, is persistently opened to control valve, then Electromagnetic force must can be made also to want suddenly to increase, but this needs is unable to catch up in increasing speed for the magnetic flux density of electromagnetic field, Therefore this requirement is also just not achieved in the increase of electromagnetic force, causes ball sealer 16 to be again switched off, after closing suffered by ball sealer 16 Hydraulic coupling is restored to maximum again, and then control valve is opened again, is repeated several times the chatter for causing ball sealer 16 in this way, until Electromagnetic force increases to the variation for having the ability to overcome high pressure fuel hydraulic coupling, could persistently open.Equally in the closing of control valve Also it will appear the above situation in journey, this process causes influence for the accuracy of the flow of outflow control valve.

The deficiency of the control valve group of the prior art also resides in, and the movement parts of the control valve include ball sealer, ball sealer Seat, valve rod, armature, be open gasket totally 5 parts, since part is more and the form tolerance control of guiding external threading and mesoporous The factors such as difficulty is big cause manufacturing cost higher.

The deficiency of the control valve group of the prior art also resides in, and the valve rod 4 of used solid construction increases movement matter Amount, influences the dynamic response of control valve.

The deficiencies in the prior art shown in Fig. 2 also reside in, high pressure fuel between electric-controlled fuel injector ontology 38 and valve seat 12 Using the radial seal mode of sealing ring 20, the material of the sealing ring 20 is plastic material for sealing, and not only intensity is low, sealing effect Fruit is poor, the problem of degeneration there is also leakproofness.

The deficiencies in the prior art shown in Fig. 2 also reside in, and hold very much because the skin depth of valve seat 12 only has 2mm or so again Easily cause valve seat 12 to deform, if the interference volume of sealing ring 20 is big, is easy to cause between piston rod 42 and the vessel of valve seat 12 and sends out Life is stuck, if the interference volume of sealing ring 20 is small, does not have reliable sealing function.Therefore the size Control of plastic seal ring It is extremely difficult.

The deficiencies in the prior art shown in Fig. 2 are, in order to make to leak from the gap of needle-valve body 29 and needle-valve 30 Fuel oil returns to low pressure oil way, it is necessary to low pressure oil return inclined hole 39 is processed on electric-controlled fuel injector ontology 38, and the low pressure oil return is oblique Hole 39 is an elongated hole, processing difficulties.

Invention content

The purpose of the present invention is being directed to shortcoming existing for prior art Electrocontrolled high-pressure fuel injection equipment (FIE), one kind is provided Good heat dissipation effect, coil and skeleton do not move down, sealed reliable, can eliminate influence, control of the erection stress to iron core magnetic permeability Chatter does not occur for valve valve rod in switching process, and dynamic response is rapider, and fuel injection amount is more accurate, and processing is easier automatically controlled High pressure fuel injection device.

The technical solution adopted by the present invention to solve the technical problems is a kind of high reliability Electrocontrolled high-pressure fuel oil injection dress It sets, including：The fluid power amplifier unit being made of electromagnetic valve component, control valve group, piston bush and piston rod, by needle-valve and needle-valve The fuel oil injecting-unit that body is constituted provides high-low pressure fuel oil runner, filtering, the automatically controlled spray of sealing for Electrocontrolled high-pressure fuel injection equipment (FIE) Oily device ontology and oil intake assembly, fastening swivel nut, it is characterised in that：In electromagnet assembly, have outer circle be stepped diameters and The electromagnet housing 9 of center vessel cavity, iron core 3 are mounted concentrically in the stepped diameters reservoir body of electromagnet housing 9, electromagnet Spring 2 is axially positioned between 1 vessel port of inner frame and armature 6, and the coil 5 that coil rack 51 coats is assembled in iron core 3 In downwardly open groove, high 3 top of iron core, which is formed with, allows 3 upper end compression position of iron core far from electromagnet main flux by path Cylinder table omoplate is contacted with 1 lower face of inner frame on the upper surface of iron core 3, and lower end opens up downwardly open annular groove, the ring It is equipped with the coil 5 coated by coil rack 51 in connected in star, stays that there are one supply at the top of coil rack 51 and 3 annular groove of iron core The gap of coil rack expansion；In control valve group, the cylinder for falling into the tapered opening of valve seat upper end is formed on the valve rod body of rod Platform cone, and the angle of the valve seat opening cone angle A of the valve seat tapered opening is more than the valve rod section of valve rod cylinder table cone angle Cone cone angle B, the taper hole of 12 upper end tapered opening of valve seat coordinate with the truncated cone of hollow structure valve rod 4, to form the cone of valve rod 4 There are one up big and down small rings between matched cylindrical surface between the 12 upper end tapered opening of necking down and valve seat of body lower end Shape gap.

Further, the sealing between the connecting bar 54 and inner frame 1 of connection coil 5 uses lip-type packing 53, when close When seal is by impacting with high pressure, the lip of lip-type packing 53 is pressed on 54 cylindrical surface of 1 hole wall of inner frame and connecting bar, then is added The auxiliary seal effect of upper " O " shape sealing ring 52, can form reliable sealing.

Further, due to the material of the part be steel alloy be made and through Overheating Treatment have very high hardness, Therefore its sealing effect is not in degeneration phenomenon in use.

The present invention has compared with the prior art also to be had the advantages that：

The reliability of good heat dissipation effect, electromagnet further increases.The present invention is directed to electromagnet iron of the existing technology The shortcoming of core cooling effect difference, using there are confessions between the lower body diameter and the diameter of bore of electromagnet housing 9 of iron core 3 The gap of fuel flow so that fuel oil in addition to can from the centre bore of iron core 3 flow out other than, can also be from the outer surface of iron core 3 It is flowed out simultaneously between gap equipped with annular fuel flow between the inner surface of electromagnet housing 9 so that the interior appearance of iron core 3 Face has fuel oil to flow through, and the film-cooled heat of electromagnet core can be made to increase by 87% or more, to keep the surfaces externally and internally of iron core 3 equal It can be adequately cooled, ensure that the reliability of electromagnet.

Coil and skeleton do not move down.The present invention is for of the existing technology because coil and coil rack expand with heat and contract with cold and cause The shortcoming that coil, skeleton shift, using the slot bottom in the upper surface of coil rack 51 and the groove of iron core 3, there are 0.2mm Expansion clearance, coil 5, coil rack 51 can be made in adstante febre, can be at 51 neutral surface of coil rack respectively to both ends Expansion is stretched, and both ends can also thereby may be ensured that coil rack after long-term work respectively to retraction at neutral surface while cooling 51 lower plane does not protrude past other than the lower face of iron core 3, while will not pull and drag conducting wire, solves because 3 heat expansion of iron core is cold The problem of winding wire caused by contracting is torn.

Eliminate influence of the erection stress to iron core magnetic permeability.The present invention is for electromagnet core of the existing technology Erection stress influences the shortcoming of iron core magnetic permeability, utilizes the iron being fixed between the seam allowance and inner frame of electromagnet housing 9 The cylinder table omoplate on 3 top of core, the path for allowing 3 compression position of iron core to pass through far from main flux, to make 3 compression position of iron core produce The path that the distributed areas of raw compression are also passed through far from main flux, thus the magnetic capacity of iron core 3 is not interfered with, it can disappear Influence except erection stress to electromagnet core magnetic capacity makes electromagnet generate the electromagnetism of bigger under same magnetic field intensity Power, to improve the efficiency of electromagnet.

The present invention is the up big and down small micro difference for arriving 0.001mm with 0.0005 using the center-hole diameter of valve seat 12 Not, the high pressure fuel having between the 12 upper end tapered opening of necking down and valve seat of 4 cone lower end of valve rod enters valve rod 4 and valve There are one the high pressures in up big and down small annular gap, being full of in the annular gap between 12 matched cylindrical surfaces of seat Fuel oil makes valve rod 4 have self-centering action for the centre bore of valve seat 12, even if also the periphery of valve rod 4 will not be affixed to valve seat Arbitrary one side of 12 centre bore, it is possible to reduce the frictional force between valve rod 4 and valve seat 12 and hydraulic clip clamp force.

Further, the twice annular balancing slit that the present invention is equipped with using the cylindrical surface of 4 lower part of valve rod, due to balancing slit In fuel pressure be uniformly act on valve rod in the radial direction so that issuable hydraulic clip clamp force reduce 75% or so, the frictional force between prevention valve rod 4 and 12 locking of valve seat and two parts of reduction is extremely advantageous.Therefore can subtract Few hydraulic clip clamp force keeps stem movement smooth.

Inner frame and connecting bar sealed reliable.The present invention can not for inner frame of the existing technology and connecting bar sealing The shortcoming leaned on installs lip-type packing 53 additional between connecting bar 54 and inner frame 1, and 53 lower end of lip-type packing is designed to lip Shape shape, when sealing ring is by impacting with high pressure, the lip of lip-type packing 7 is pressed on 12 hole wall of inner frame and connecting bar 10 is justified On cylinder, along with the auxiliary seal of " O " shape sealing ring 9 acts on, reliable sealing can be formed.

Chatter does not occur for control valve valve rod in switching process, and dynamic response is rapider, and fuel injection amount is more accurate.This hair The bright movement for valve rod of the existing technology is influenced by fluid pressure, driving power consumption is high, flow error is big, influences emitted dose Precision shortcoming, the present invention coordinated using the truncated cone of taper hole and the valve rod 4 of 12 upper end tapered opening of valve seat, valve The valve seat opening cone angle A angles of the tapered opening of seat 12 are more than the angle of the valve rod truncated cone cone angle B so that the valve rod truncated cone Sealed diameter between both valve seat tapered openings contact surface is equal with the diameter on the cylindrical surface of valve rod 4, so that valve rod 4 is bored Active force phase of the high pressure oil having between the necking down of body lower end and 12 upper end tapered opening of valve seat to 4 necking down both sides of valve rod Deng, it not will produce axial force to ensure high pressure oil to valve rod, since valve rod is not subjected to the axial liquid pressure of highly pressurised liquid, There is no need to such as prior art so high spring forces to be sealed, it is possible to reduce the required power consumption of switching control pilot and Flow error realizes being precisely controlled for emitted dose so that the movement of valve rod is not influenced by fluid pressure.

Further, it is also due to high pressure oil and not will produce axial force interference to valve rod, so the switch of control valve is not Chatter phenomenon is had, so as to improve the precision of injection flow.

Dynamic response is fast.The present invention is for art of solid valve rod since quality ambassador's valve rod dynamic response is affected Shortcoming the switching speed for improving valve rod 4 due to very light weight, is conducive to, therefore can using the valve rod 4 of hollow structure To shorten the dynamic response time of valve rod 4.

Sealed reliable is not in that sealing is degraded.The present invention exists for prior art Electrocontrolled high-pressure fuel injection equipment (FIE) Valve seat 12 and electric-controlled fuel injector ontology 38 between the sealing effect of radial seal is carried out using sealing ring made of plastic material Difference, the technical issues of being easy to that valve seat bore deformation and plastic material is caused to be easy to aging, lower plane of the present invention using valve seat 12, work The plane that the upper and lower plane of plug sleeve 44, the counterbore plane of 38 center vessel of electric-controlled fuel injector ontology are constituted is to the hard close of plane Envelope form, it is only necessary to ensure the lower plane of valve seat 12, the lower planes of piston bush 44, electric-controlled fuel injector ontology 38 center vessel The precision of counterbore plane is to ensure that the height for the piston bush 44 being connected with the high pressure oil-through-hole 41 of electric-controlled fuel injector ontology 38 It is pressed into the sealing between oilhole 18 and between piston bush 44 and the oil-through-hole 43 of valve seat 12.Due to being led using flat seal form Cause the deformation ratio prior art of the valve seat 12,44 center hole of piston bush much smaller using the deflection of radial seal, Valve rod will not be caused stuck.

Further, since the sealing plane of 38 center vessel of electric-controlled fuel injector ontology is exposed plane, make electronic control injection The processing of device ontology 38 becomes easier to.

Further, due to the material of the part be steel alloy be made and through Overheating Treatment have very high hardness, Therefore its sealing effect is not in degeneration phenomenon in use.

Reduce manufacturing cost.The present invention is directed to the higher shortcoming of the more costs of prior art control valve part, uses The tapered opening on the 4 middle part truncated cone of valve rod and 12 top of valve seat seal, 4 lower cylinder of valve rod and 12 center of valve seat of use The cylindrical hole of vessel is oriented to, and is not required to ball sealer and sealed ball seat, and the lower cylindrical face of valve rod is matched with valve seat orifice, is not necessarily to It is further added by guide sleeve structure, therefore avoids the factor that the geometric tolerance of external threading and mesoporous is difficult to control that is oriented to, while also being subtracted Number of parts is lacked, to reduce manufacturing cost.

The oil return that low pressure oil return inclined hole 39 is processed on electric-controlled fuel injector ontology 38 that the present invention is used for the prior art The shortcoming of processing difficulties caused by mode, the present invention are formed by ring using electric-controlled fuel injector ontology 38 and piston rod 42 Shape gap 45 makes the fuel oil leaked from needle-valve and piston fit clearance return to low pressure chamber 55, so as to eliminate because of electric-controlled fuel injector Ontology needs to process the problem of long thin oil return hole leads to processing difficulties.Processing is set to be easier.

The present invention has the characteristics that control valve center arrangement, exposed plane hard seals, center slot oil return.

Description of the drawings

Fig. 1 is a kind of high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) for high-pressure common rail oil supply system of the present invention Sectional view.

Fig. 2 is the sectional view of the Electrocontrolled high-pressure fuel injection equipment (FIE) of the prior art.

In figure：1 inner frame, 2 electromagnet springs, 3 iron cores, 4 valve rods, 5 coils, 6 armature, 7 damping springs, 8 gaskets, 9 electricity Magnet shell, 10 fastening swivel nuts, 11 sealing rings, 12 valve seats, 13 gaskets, 14 guide sleeves, 15 fastening swivel nuts, 16 ball sealers, 17 Sealed ball seat, 18 high pressure fuel feed holes, 19 high pressure oil outlets, 20 sealing rings, 21 sealing rings liner, 22 backstop boss, 23 low pressure are returned Oilhole, 24 oil nozzle spring adjusting pads, 25 oil nozzle springs, 26 spring spools, 27 needle lift adjusting pads, 28 fastening swivel nuts, 29 needles Valve body, 30 needle-valves, the oilhole of 31 high pressures, 32 oil holding slots, 33 annular gaps, 34 spray orifices, 35 oil inlet filter elements, 36 oil inlet bolts, 37 Oil inlet bolt gasket, 38 electric-controlled fuel injector ontologies, 39 low pressure oil return inclined holes, 40 logical oily grooves, 41 high pressure oil-through-holes, 42 pistons Bar, 43 oil-through-holes, 44 piston bush, 45 annular gaps, 46 opening gaskets, 47 electromagnet spring adjusting pads, 50 inclined oil hole of air, 51 coils Skeleton, 52 " O " shape sealing rings, 53 lip-type packings, 54 connecting bars, 55 low pressure chambers 55, A valve seats opening cone angle, B valve rod truncated cones Body cone angle.

Specific implementation mode

Refering to fig. 1.In the embodiment described below, a kind of high reliability Electrocontrolled high-pressure fuel injection equipment (FIE), including：By Preposition control unit that electromagnet assembly and control valve group are constituted, the fluid power amplifier unit being made of piston bush and piston rod, The fuel oil injecting-unit that is made of needle-valve and needle-valve body provides high-low pressure fuel oil runner, mistake for Electrocontrolled high-pressure fuel injection equipment (FIE) The parts such as filter, sealing and electric-controlled fuel injector ontology, oil intake assembly, fastening swivel nut, switching swivel nut.The iron core 3 of electromagnet, rank The parts such as iron 6, valve rod 4, valve seat 12, piston bush 44, piston rod 42 use center arrangement mode, make above-mentioned part and electronic control injection Device ontology 38 is concentric.In electromagnet assembly, 9 outer circle of electromagnet housing is stepped diameters, center vessel cavity, iron core 3 It is mounted concentrically in the stepped diameters reservoir body of electromagnet housing 9, electromagnet spring 2 is axially positioned on 1 vessel port of inner frame Between armature 6, the coil 5 that coil rack 51 coats is assembled in the downwardly open groove of iron core 3, and 3 top of iron core is formed with Allow cylinder table omoplate of the 3 upper end compression position of iron core far from electromagnet main flux by path, on the upper surface of iron core 3 with in-seam 1 lower face of frame contacts, lower end opens up downwardly open annular groove, is equipped in the annular groove and is coated by coil rack 51 The gap expanded for coil rack there are one being stayed at the top of coil 5, coil rack 51 and 3 annular groove of iron core.

One outer circle is the electromagnet housing 9 of stepped diameters and the center vessel cavity with concentric multi-grade diameter, with one heart The outside for being assemblied in electromagnet housing 9 is played the iron acting fastening swivel nut of Motionless electromagnetic 10 and is connected firmly and transferring on swivel nut 48, described turn It connects swivel nut 48 to be connected in one heart on the external screw thread of electric-controlled fuel injector ontology 38, the switching swivel nut 48 is successively by valve seat 12, piston Set 44 is connected in the exposed plane of electric-controlled fuel injector ontology 38, and iron core 3 is assemblied in 9 center reservoir body of electromagnet housing, electricity Magnet spring 2 is axially positioned between 1 vessel port of inner frame and armature 6, and the coil 5 that coil rack 51 coats is assembled in iron In the downwardly open groove of core 3,5 conducting wire both ends of the coil are connected with two connecting bars 54 respectively.3 top of iron core, which is formed with, to be allowed The cylinder table omoplate in the path that 3 upper end compression position of iron core is passed through far from electromagnet main flux.On the upper surface of iron core 3 with in-seam 1 lower face of frame contacts, and the end face of getting out of a predicament or an embarrassing situation for the cylinder table that the top of iron core 3 is formed with is flat with 9 vessel upper step of electromagnet housing Face contact, by 9 vessel upper end opening distortion in rolling of electromagnet housing make the cylinder table omoplate of iron core 3 be connected in inner frame 1 with Between electromagnet housing 9.In the Upper cylindrical shoulder shoulder blade face of iron core 3 and adjacent 9 annular step face of electromagnet housing and There are the gaps for fuel flow between the lower body diameter and the diameter of bore of electromagnet housing 9 of iron core 3 so that fuel oil in addition to It can also be set between the outer surface of iron core 3 and the inner surface of electromagnet housing 9 other than the outflow of the centre bore of iron core 3 Have between the gap of annular fuel flow while flowing out so that the surfaces externally and internally of iron core 3 has fuel oil to flow through, to make iron core 3 It is adequately cooled；3 lower end of iron core opens up downwardly open annular groove, is equipped with by line in the annular groove of iron core 3 The coil 5 that ring framework 51 coats, coil rack 51 and 3 groove top of iron core stay that there are one the gaps expanded for coil rack.

It is concentric successively by swivel nut 48 of transferring for the electric-controlled fuel injector ontology 38 of exposed plane with central cavity and upper end It by piston bush 44, valve seat 12, is connected on the upper transverse plane of electric-controlled fuel injector ontology 38, gasket 13 is connected in by fastening swivel nut 15 On the step plane of valve seat 12.High pressure oil outlet 19 is made with one heart on the central circular vessel top of piston bush 44, is extruded in height 19 upper end of oilhole is formed with inclined hole and is connected with the vertical hole that valve seat 12 is formed with, and passes straight through to valve by the inclined hole that valve seat 12 is formed with The vessel that the necking down of seat 12 and valve rod 4 is constituted.There are one the center circles with piston bush 44 to describe for the other side system of piston bush 44 The high pressure fuel feed hole 18 that chamber is connected, hole and electric-controlled fuel injector sheet of 18 lower end of high pressure fuel feed hole by a vertical direction High pressure oil-through-hole 41 on body 38 is connected.Also there are one inclined oil hole of air 50 for system on piston bush 44（In figure shown in dotted line）Its lower end with The central circular vessel of electric-controlled fuel injector ontology 38 is connected with the annular gap 45 that piston rod 42 is constituted, the upper end and valve seat The low pressure oil return hole 23 being formed on 12 is connected, and the low pressure oil return hole 23 being formed on valve seat 12 is connected with low pressure chamber 55 again, energy It is enough that the fuel oil leaked from needle-valve and needle-valve body and the fit clearance of piston and piston bush is flowed in low pressure chamber 55.Valve seat Conical valve port is made on 12 tops with one heart, has ladder outer circle and hollow valve rod 4 and the conical valve port lower section of the valve seat 12 The central circular vessel made with one heart matches, and the truncated cone is formed in the middle part of valve rod, and the truncated cone is cylinder table cone, falls into valve In the bellmouth of 12 upper end tapered openings of seat, and the cone angle A of 12 upper end tapered opening of the valve seat is more than in the valve rod The valve rod truncated cone cone angle B in portion, the sealed diameter between the two contact surface is equal with the diameter on the cylindrical surface of valve rod 4,4 middle part of valve rod It is equipped between the 12 upper end tapered opening of necking down and valve seat of cone lower end and offsets each other to fluid pressure suffered by 4 both ends of valve rod Empty slot.It is formed with backstop boss 22 in fastening 15 lower central vessel of swivel nut, the backstop is changed by the thickness of adjusting gasket 13 Gap between boss 22 and the cone upper step plane of valve rod 4, to control valve rod travel.Armature 6 is concentrically mounted on The upper plane at the middle part of valve rod 4, armature 6 is limited by being stuck in the opening gasket 46 at 4 necking down position of valve rod, and damping spring 7 supports Between armature and fastening swivel nut 15, electromagnet spring 2 is concentrically mounted on 4 Upper cylindrical shoulder shoulder blade of valve rod, the electromagnet It is concentric between spring 2 and inner frame 1 that electromagnet spring adjusting pad 47 is installed to adjust the pretightning force of electromagnet spring, valve rod 4 Normally off is under the action of electromagnet spring 2.Gasket is installed with one heart on 38 upper stage terrace of electric-controlled fuel injector ontology 8, electromagnet housing 9 is concentrically mounted on above gasket 8, is ensured on iron core lower face and armature 6 by the thickness of adjusting gasket 8 Gap between end face.Iron core 3, inner frame 1 are stacked in successively in the center vessel of electromagnet housing 9, pass through electromagnet housing 9 The closing in of upper end makes iron core 3 be pressed between inner frame 1 and electromagnet housing 9.It is downwardly open that coil 5 is mounted on iron core 3 In annular groove, there are the gaps of 0.2mm for the slot bottom of the upper plane of 5 upper coil skeleton 51 of coil and the annular groove of the iron core.With tight Gu swivel nut 10 is connected in by electromagnet housing 9 on electric-controlled fuel injector ontology 38, with sealing ring 11 to electromagnet housing 9 and switching It is sealed between swivel nut 48, is sealed between switching swivel nut 48 and electric-controlled fuel injector ontology 38 with sealing ring 49.

Be mounted concentrically at in the 38 center vessel cavity of electric-controlled fuel injector ontology of the concentric vessel cavity of external cylindrical surface Valve seat 12, fasten valve seat 12 used in gasket 13 and fastening swivel nut 15, the valve rod 4 of 12 central cavity of concentric inserted valve seat, with And the damping spring 7 with 4 concentric fits of valve rod, armature 6, gasket 8 and electromagnet spring 9.Valve rod 4 is formed with using with mitigation matter The blind hole of the hollow structure of amount, there are one the truncated cone that angle is B, the truncateds cone to fall into end cone on valve seat 12 for valve rod middle part system It seals in the tapered opening that angle is A, and the valve seat opening cone angle A of 12 upper end tapered opening of the valve seat is more than valve rod The angle of the valve rod truncated cone cone angle B of the truncated cone, the diameter phase of sealed diameter and the cylindrical surface of valve rod 4 between the two contact surface Deng equipped with mutual to fluid pressure suffered by 4 both ends of valve rod between the 12 upper end tapered opening of necking down and valve seat of 4 cone lower end of valve rod The empty slot offseted, wherein the high pressure that empty slot connection valve seat 12 in side tilts down straight-through 38 lower part of electric-controlled fuel injector ontology is logical Oilhole 41.

In the height that the high pressure fuel feed hole 18 that the side of piston bush 44 is formed with is formed with 38 side of electric-controlled fuel injector ontology Oil-through-hole 41 is pressed to connect, and the oil inlet passage phase for the inclined hole and oil inlet bolt 36 being formed with by 38 side of electric-controlled fuel injector ontology Logical, oil inlet bolt gasket 37 is mounted on and seals between oil inlet bolt 36 and body 38, is filled with one heart among oil inlet bolt 36 There is oil inlet filter element 35, fuel oil is filtered.In the lower plane concentric fits needle-valve body 29 and needle-valve of electric-controlled fuel injector ontology 38 30, it is formed with the high pressure oil-through-hole 41 of inclined high pressure fuel feed hole 31 and 38 side of electric-controlled fuel injector ontology in the side of needle-valve body 29 It is connected, through to 36 corresponding inclined hole of oil inlet bolt.The circular central vessel of piston bush 44 and the piston with ladder outer circle Bar 42 matches, and the lower end of piston rod 42 is pressed in the centre of plane on needle-valve 30 by needle lift adjusting pad 27, in work The top of stopper rod 42 forms a volume that can store high pressure fuel with the circular central vessel of piston bush 44, and the described volume can To accommodate the high pressure fuel from high pressure fuel feed hole 18, the high compression ignition at the top of piston rod 42 when valve rod 4 is closed Oil makes valve rod be pressed on needle-valve 30, applies pressure to needle-valve body 29 by needle-valve 30, control valve is in and beats after valve rod 4 lifts Open state, the high pressure fuel in the described volume form access by oil-through-hole 43 and low pressure chamber 55, make the top of piston rod 42 Fuel pressure reduce, to make piston rod 42 reduce the pressure of needle-valve 30.

Oil holding slot 32 is formed in the middle part of needle-valve body, the high pressure oil hole 31 on the needle-valve body and oil holding slot 32, needle-valve body Annular gap 33 between needle-valve is connected, and passes straight through to needle-valve sealed seat surface.Needle lift adjusting pad 27 is mounted on needle-valve Between 30 and piston rod 42 transverse plane on needle-valve is located to the lift of metering pin valve, the endoporus step surface of spring spool 26 On, oil nozzle spring adjusting pad 24, oil nozzle spring 25 are supported on 38 lower stage terrace of electric-controlled fuel injector ontology and spring spool successively Needle-valve is set to be in normally off between 26.

Further, the sealing between connecting bar 54 and inner frame 1 uses lip-type packing 53, when sealing ring is by high pressure When impact, the lip of lip-type packing 53 is pressed on 54 cylindrical surface of 1 hole wall of inner frame and connecting bar, along with " O " shape is close The auxiliary seal of seal 52 acts on, and can form reliable sealing.

When fuel-injected device works, coil switch power, the air gap between iron core 3 and armature 6 generates magnetic flux, makes Armature 6 generates upward electromagnetic force, overcomes the spring force of electromagnet spring 2 that valve rod 4 is made to move upwards, and is opened in the taper of valve seat 12 Just an opened gap to circulate for high pressure fuel, the high pressure fuel warp of outflow are formd between mouth and the truncated cone of valve rod 4 The low of 1 inner frame is flowed to by high pressure oil outlet 19, valve seat 12 and the low pressure oil return hole 23 of 4 opened gap of valve rod, fastening swivel nut 15 Press chamber 55.Piston bush 44 is reduced rapidly with pressure in the center vessel of piston rod 42 at this time, the hydraulic coupling that piston rod upper end is subject to Also reduce rapidly, and via the high pressure oil-through-hole 41 of electric-controlled fuel injector ontology, needle-valve body high pressure fuel feed hole 31 through to needle-valve The high pressure fuel of the oil holding slot 32 of body acts on that the pressure on needle-valve is still very high, with the center of piston bush 44 and piston rod 42 In vessel pressure further decrease until the pressure for acting on high pressure fuel on needle-valve can overcome oil nozzle spring elastic force and and When the hydraulic coupling on piston rod top, needle-valve 30 will push piston-rod lower end that piston rod is made to transport upwards by needle lift adjusting pad 27 Dynamic, high pressure fuel passes through the gap of needle-valve and needle-valve body to be sprayed from spray orifice 34.

After coil blackout, the magnetic flux of the air gap between iron core 3 and armature 6 disappears, act on electromagnetic force on armature 6 with Disappearance.Valve rod 4 is closed under the action of electromagnet spring 2, and the circulation path of high pressure oil outlet 19 is cut off, piston bush 44 with The center vessel intermediate fuel oil pressure of piston rod 42 rises rapidly, and the pressure for acting on 42 upper surface of piston rod rises rapidly therewith, Since the diameter of piston rod 42 is more than the diameter of needle-valve 30, piston rod 42 will push needle-valve downlink together, in the connection of oil nozzle spring Cooperation makes needle-valve close under, end of injection.

Claims (10)

1. a kind of high reliability Electrocontrolled high-pressure fuel injection equipment (FIE), including：By electromagnetic valve component, control valve group, piston bush and The fluid power amplifier unit that piston rod is constituted, the fuel oil injecting-unit being made of needle-valve and needle-valve body spray for Electrocontrolled high-pressure fuel oil Device provides high-low pressure fuel oil runner, filtering, the electric-controlled fuel injector ontology of sealing and oil intake assembly, fastening swivel nut, feature It is：In electromagnet assembly, electromagnet housing（9）Outer circle is the center vessel cavity of stepped diameters, iron core（3）Concentric fits In electromagnet housing（9）Stepped diameters reservoir body in, electromagnet spring（2）It is axially positioned on inner frame（1）Vessel port with Armature（6）Between, coil rack（51）The coil of cladding（5）It is assembled in iron core（3）In downwardly open groove, iron core（3） Top, which is formed with, allows iron core（3）Upper end compression position is far from electromagnet main flux by the cylinder table omoplate in path, iron core（3）It is upper On end face with inner frame（1）Lower face contacts, and lower end opens up downwardly open annular groove, is equipped with by line in the annular groove Ring framework（51）The coil of cladding（5）, coil rack（51）With iron core（3）It is swollen for coil rack there are one being stayed at the top of annular groove Swollen gap；In control valve group, the cylinder table cone for falling into the tapered opening of valve seat upper end, and institute are formed on the valve rod body of rod State valve seat（12）The angle of the valve seat opening cone angle A of tapered opening is more than the valve rod truncated cone cone angle of valve rod cylinder table cone angle B, taper hole and the hollow structure valve rod of the tapered opening of valve seat upper end（4）The truncated cone cooperation, to form valve rod（4）Cone lower end Necking down and valve seat（12）There are one between up big and down small annular between matched cylindrical surface between the tapered opening of upper end Gap.

2. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：In iron core（3）It is upper Portion cylinder table omoplate face and adjacent electromagnet housing（9）Annular step face and iron core（3）Lower body diameter and electromagnetism Iron-clad body（9）Diameter of bore between there are the gaps for fuel flow, meanwhile, in the upper surface of coil injection article and iron core （3）There are the expansion clearances of 0.2mm for the slot bottom of bottom end annular groove.

3. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：Fasten swivel nut（10）It is logical Cross electric-controlled fuel injector ontology（38）External screw thread by electromagnet housing（9）, gasket（8）It is connected in electric-controlled fuel injector ontology with one heart （38）Center vessel plane on.

4. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：Iron core（3）Upper end Face and inner frame（1）Lower face contacts, get out of a predicament or an embarrassing situation end face and the electromagnet housing of the cylinder table that top is formed with（9）Vessel upper stage Rank plane contact, passes through electromagnet housing（9）Vessel upper end opening distortion in rolling makes iron core（3）Cylinder table omoplate be connected in Skeleton（1）With electromagnet housing（9）Between.

5. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：In iron core（3）It is upper Portion cylinder table omoplate face and adjacent electromagnet housing（9）Annular step face and iron core（3）Lower body diameter and electromagnetism Iron-clad body（9）Diameter of bore between there are the gaps for fuel flow.

6. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：With central cavity and Center vessel plane electric-controlled fuel injector ontology（38）, by fastening swivel nut（15）Electric-controlled fuel injector ontology（38）Internal thread successively With one heart by gasket（13）, valve seat（12）, piston bush（44）It is connected in electric-controlled fuel injector ontology（38）Center vessel counterbore plane On, make the connection valve seat（12）, piston bush（44）, electric-controlled fuel injector ontology（38）Oil-through-hole（43）, high pressure fuel feed hole （18）, high pressure oil outlet（19）, high pressure oil-through-hole（41）All it is located at valve seat（12）, piston bush（44）, electric-controlled fuel injector sheet Body（38）Between within the plane that contacts.

7. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 6, it is characterised in that：In piston bush（44）'s High pressure oil outlet is made with one heart in central circular vessel top（19）, in high pressure oil outlet（19）Upper end is formed with inclined hole and valve seat（12） The vertical hole being formed with is connected, and passes through valve seat（12）The inclined hole being formed with passes straight through to valve seat（12）With valve rod（4）Necking down institute The vessel of composition.

8. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 7, it is characterised in that：Piston bush（44）One There are one side systems and piston bush（44）The high pressure fuel feed hole that is connected of central circular vessel（18）, the high pressure fuel feed hole（18） Hole and electric-controlled fuel injector ontology of the lower end by a vertical direction（38）On high pressure oil-through-hole（41）It is connected；The piston Set（44）On also system there are one inclined oil hole of air（50）, piston bush（44）Lower end and electric-controlled fuel injector ontology（38）Central circular vessel And piston rod（42）The annular gap constituted（45）It is connected, upper end and valve seat（12）On the low pressure oil return hole that is formed with（23）Phase Connection, valve seat（12）On the low pressure oil return hole that is formed with（23）And and low pressure chamber（55）Be connected so that from needle-valve and needle-valve body with And the fuel oil leaked in the fit clearance of piston and piston bush flows to low pressure chamber（55）In.

9. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as described in claim 1, it is characterised in that：Valve seat（12）Top is same The heart makes conical valve port, has ladder outer circle and hollow valve rod（4）With the valve seat（12）Below conical valve port with one heart The central circular vessel made matches, valve rod（4）The truncated cone falls into valve seat（12）In the bellmouth of upper end tapered opening, in The necking down of portion cone lower end and valve seat（12）It is equipped with to valve rod between the tapered opening of upper end（4）Fluid pressure suffered by both ends is mutual The empty slot of counteracting, wherein the side of empty slot is connected to valve seat（12）Tilt down straight-through electric-controlled fuel injector ontology（38）The height of lower part Press oil-through-hole（41）.

10. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 8, it is characterised in that：Piston bush（44）'s Circular central vessel and the piston rod with ladder outer circle（42）It matches, piston rod（42）Lower end adjusted by needle lift Pad（27）It is pressed in needle-valve（30）The centre of upper plane, in piston rod（42）Top and piston bush（44）Circular central hold Chamber forms a cavity volume that can store high pressure fuel, which, which accommodates, comes from high pressure fuel feed hole（18）High pressure fuel, when Valve rod（4）Piston rod when being closed（42）The high pressure fuel at top so that valve rod is pressed on needle-valve（30）On, pass through needle Valve（30）To needle-valve body（29）Apply pressure, works as valve rod（4）Lift that rear control valve is in the open state, the high pressure in the cavity volume Fuel oil passes through oil-through-hole（43）With low pressure chamber（55）Access is formed, piston rod is made（42）Top fuel pressure reduce, to Make piston rod（42）To needle-valve（30）Pressure reduce.