CN106050501A - Electric control high-pressure fuel injection device with high reliability - Google Patents

Abstract

The invention discloses an electric control high-pressure fuel injection device with high reliability and aims at providing a fuel injection device good in heat dissipation effect, more rapid in dynamic response and more accurate in fuel injection amount. According to the technical scheme, the angle of a valve seat opening cone angle A of a conical opening of a valve seat (12) is larger than that of a cone angle B of a valve rod truncated cone, and therefore annular gaps can be formed between a necking down part at the lower end of a cone of a valve rod (4) and a conical opening in the upper end portion of the valve seat (12) and between matched cylindrical faces. A cylinder platform shoulder for making a pressed part at the upper end of an iron core get away from the electromagnet main flux passing path is manufactured at the upper portion of the iron core (3), the upper end face of the iron core makes contact with the lower end face of an inner frame (1), an annular groove with a downward opening is formed in the lower end of the iron core, and a coil (5) wrapped by a coil frame (51) is assembled in the annular groove. A gap for expansion of the coil frame is reserved in the tops of the coil frame and the annular groove of the iron core.

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 in high-pressure common rail oil supply system that the present invention relates to.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 system, compare such as electronically controlled unit pump, electrically-controlled pump nozzle, electronic control dispensing pump etc., have three topmost Feature.One to be because expulsion pressure and engine speed be decoupling, and expulsion pressure is unrelated with engine speed, no matter so Motivation is operated in the expulsion pressure which kind of operating mode Electrocontrolled high-pressure common rail spraying system can provide optimal；Two is that high-pressure oil pump will Send in a common high pressure oil rail after fuel oil compression, then high pressure fuel is delivered to each by this common high pressure oil rail The Electrocontrolled high-pressure fuel injection equipment (FIE) of cylinder, can make the Electrocontrolled high-pressure fuel injection equipment (FIE) of each cylinder in identical injection pressure Spray under power；Three is can be according to the requirement of efficiency of combustion, pollutant emission and comfortableness etc. in a cycle of operation Realize multi-injection.These features of Electrocontrolled high-pressure common rail spraying system are all fuel feeding systems in the past used on a diesel engine Not available for system, therefore Electrocontrolled high-pressure common rail spraying system becomes the first-selection of diesel engines at present oil supply system.Electrocontrolled high-pressure is altogether Rail oil supply system is mainly by controller i.e. ECU i.e. ECU, Electrocontrolled high-pressure oil pump, high pressure oil rail (i.e. so-called " common rail "), electricity The compositions such as control high-pressure injection device, sensor.The control software write is stored in ECU by the needs according to engine operating condition. The real-time working condition parameter of electromotor wish and the sensor of driver detected during electromotor work is such as: rotating speed, load, The information such as temperature, pressure input ECU, 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, in order to control the oil mass of Electrocontrolled high-pressure oil pump output, pressure, Electrocontrolled high-pressure injection apparatus start injection time The number of times etc. of injection in the persistent period carve, sprayed, a circulation, meanwhile ECU may also participate in the operational management of automobile. Because the rotating speed of electromotor is the highest, it is desirable to the dynamic response of control system must quickly, generally with microsecond meter, so obtaining from ECU Start to input instruction until the time used by fuel oil injection that stops must adapt to the requirement of electromotor.Wherein the computing of ECU with And the speed of signal of telecommunication transmission is no problem, it is critical only that the speed of the speed of executor.Executor belongs to power device, Can not be made very big owing to device itself is limited to the requirement in terms of volume, heat radiation and size, thus drive the lifting of power also Being restricted, the quality of the movement of metallic part that in addition had in structure, spring etc. is relatively big, the most also the resistance such as hydraulic coupling The impact of Buddhist nun's factor, the time making executor take relatively to much longer, therefore to improve the response speed of executor and become electricity The key of control common-rail injection system.Additionally, be just that the aspects such as a power device, its efficiency and reliability also become due to executor Technological difficulties for this system.

Electrocontrolled high-pressure fuel injection equipment (FIE) is the executor of Electrocontrolled high-pressure common rail oil supply system, specifically includes that by electric magnet The preposition control parts that assembly and control valve assembly are constituted, the fluid power amplifier unit being made up of piston bush and piston rod etc., by pin Valve and needle-valve body etc. constitute fuel oil injecting-unit, for Electrocontrolled high-pressure fuel injection equipment (FIE) provide high-low pressure fuel oil runner, filtration, Seal and the parts compositions such as the electric-controlled fuel injector body of function, oil intake assembly, fastening swivel nut such as connect firmly.

In the prior art, Electrocontrolled high-pressure fuel injection equipment (FIE) specifically includes that by electromagnet assembly and control valve assembly structure The preposition control parts, the fluid power amplifier unit that is made up of piston bush and piston rod etc. that become, it is made up of needle-valve and needle-valve body etc. Fuel oil injecting-unit, high-low pressure fuel oil runner is provided for Electrocontrolled high-pressure fuel injection equipment (FIE), the function such as filters, seal and connect firmly Body, oil intake assembly, the parts such as fastening swivel nut composition.Preposition control parts, fluid power amplifier unit, injecting-unit all use With electric-controlled fuel injector body 38 arranged concentric, the assemble sequence of parts is as described below, the electromagnetism that preposition control parts are comprised Iron component and control valve assembly are stacked in electric-controlled fuel injector body 38 top, wherein, get out of a predicament or an embarrassing situation plane and the automatically controlled spray of valve seat 12 Oil device body 38 center cavity volume plane contact, between valve seat 12 with electric-controlled fuel injector body 38 formed one ring-type become oil groove, High pressure fuel in ring-type one-tenth oil groove is sealed by the radial seal mode using sealing ring 20 in the bottom becoming oil groove, seals lining papers Sealing ring 20 torr is served as a contrast on the step of electric-controlled fuel injector body 38 by pad 21, and the material of described sealing ring 20 is plastic material, no Only intensity is low, sealing effectiveness is poor, there is also the problem that sealing is degraded.The top of the center cavity volume of valve seat 12 is that a taper is opened Mouthful, the upper plane of valve seat 12 closed assembly pad 13 successively, fairlead 14, and by fastening swivel nut 15 at electric-controlled fuel injector body 38 center Cavity volume get out of a predicament or an embarrassing situation in plane, the lower surface of electromagnet housing 9 by fastening swivel nut 10 be connected in electric-controlled fuel injector body 38 Heart cavity volume top bar in plane, iron core 3 is mounted concentrically in the cavity volume of electromagnet housing 9 center, lower surface and electromagnet housing Inner chamber step cutting pattern face contacts, and upper surface contacts with the lower plane of inner frame 1, and being closed up by magnet electromagnetic iron-clad body 9 upper end will Iron core 3 is pressed between inner frame 1 and electromagnet housing 9, and its result makes the biggest erection stress that the urceolus of iron core 3 produces, The serious permeability affecting iron core 3, so that the efficiency of electric magnet is substantially reduced.The groove downwardly open at iron core 3 is built-in Being furnished with the coil 5 being coated with by coil rack 51, coil 5 wire two ends are connected with power supply respectively by wiring rod 54.Ball sealer 16, Sealed ball seat 17, valve rod 4, electric magnet spring 2 are stacked in the tapered opening of valve seat 12 and the center cavity volume port of inner frame 1 successively Between, ball sealer 16 forms band with the tapered opening of valve seat 12, and valve rod 4 is a ladder rotary body, when valve rod is upwards transported Time dynamic, the top of its lower end disc is by the position-limiting action of the backstop boss 22 on fairlead 14, and the valve rod control valve that moves upward is beaten Opening, the high pressure fuel from high pressure oil outlet 19 flows to low pressure chamber 55, and valve rod falls then control valve and closes, from high pressure oil outlet The high pressure fuel of 19 is truncated.The upper surface of armature 6 connects with the lower surface of the opening pad 46 of the draw-in groove being installed in valve rod 4 Touching, damping spring 7 is supported between fairlead 14 and armature 6." O " shape sealing ring 52 is contained between inner frame 1 and wiring rod 54 Seal.After energising, by wiring rod 54, it is connected to the two ends of coil 5, has electric current to flow through in coil 5, at iron core 3 In just create magnetic field, this magnetic field is through the air-gap iron core 3 and armature 6 so that armature 6 obtain make it move upward Electromagnetic force, when electromagnetic force is more than the spring force of electric magnet spring 2, armature 6 just can overcome spring force to move upward, and coil breaks After electricity, electromagnetic force disappears, and armature 6 returns again in situ under the effect of electric magnet spring 2.

In the prior art fluid power amplifier unit shown in Fig. 2, fluid power amplifier unit includes: be concentrically mounted on electronic control injection The valve seat 12 of the multistage external diameter of the effect having piston bush concurrently in the center cavity volume of device body 38, during valve seat 12 bottom is had Heart cavity volume matches with the piston rod 42 of multistage external diameter, one pin of concentric installation between piston rod 42 lower end with needle-valve 30 upper surface Lift of a valve adjusting pad 27, adjustment pin is played in the gap being determined by piston rod 42 upper surface and 12 valve seats between cavity volume lower surface The effect of the lift of a valve.

Prior art uses the fuel oil injecting-unit shown in Fig. 2, including: there is concentric multi-grade external diameter and lower end has The needle-valve body 29 of spherical-like morphology is connected firmly on the lower plane of electric-controlled fuel injector body 38, by fastening swivel nut 28 in needle-valve body 29 in the heart Portion is shaped with two circular shape holes with one heart, makes a scrotiform oil holding slot with one heart in the middle of upper said two circular shape hole, Lower end, said two circular shape hole makes a taper valve port with one heart, connects an aperture, in institute below taper valve port State and at aperture, be shaped with several radial spray orifice 34, be shaped with inclined hole 31 in the side of described scrotiform oil holding slot and pass straight through to upper surface, There is concentric multi-grade external diameter and lower end has the needle-valve 30 of cone form and is concentrically mounted in the cavity volume of needle-valve body 29 center, described The cone of needle-valve 30 lower end matches with the taper valve port of needle-valve body 29 lower end and ensures the sealing of high pressure fuel, described needle-valve The circular hole that 30 bottom round diameters are corresponding with needle-valve body 29 leaves annular gap 33, can make the height from electric-controlled fuel injector body 38 The high pressure fuel of pressure oil through 41 via the inclined hole 31 of needle-valve body 29, scrotiform oil holding slot, annular gap 33 until needle-valve 30 lower end The taper valve port of cone and needle-valve body 29 lower end match and sealing position.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 contacts with electric-controlled fuel injector body 38 lower cavity step surface, Oil nozzle spring 25 is installed and is supported between the lower plane of spring spool 26 top and oil nozzle spring adjusting pad 24, oil nozzle spring 25 to Under elastic force needle-valve is sealed.

Prior art uses oil intake assembly as shown in Figure 2, including: outside two ends are screw thread and have center cavity volume Oil-feed bolt 36, the center cavity volume close-fitting of oil inlet filter element 35 and oil-feed bolt 36 closes the effect of filter fuel impurity, One end of oil-feed bolt 36 connects firmly in the screw that electric-controlled fuel injector body 38 upper side is made, at oil-feed bolt 36 with automatically controlled High pressure fuel is sealed by the oil-feed bolt seal pad 37 between injector body 38, and the other end of oil-feed 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-feed bolt and filter element filtering The high pressure oil through 41 of injector body 38, provides high pressure fuel for Electrocontrolled high-pressure injection apparatus.

During work, coil switch power, the air gap between iron core 3 and armature 6 produces magnetic flux, makes armature 6 produce upwards Electromagnetic force overcome the spring force of valve rod spring 2 to make valve rod 4 move upward, ball sealer 16, sealed ball seat 17 are by from oil-feed spiral shell On the upside of bolt, electric-controlled fuel injector body 38, the inclined oil hole of air at position, high pressure fuel feed hole 18, the high pressure fuel of high pressure oil outlet 19 rush, High pressure fuel flows to low pressure chamber 55 via the low pressure spill port 23 of fairlead so that in the cavity volume between valve seat 12 and piston rod 42 Rapid pressure drop, and via the inclined oil hole of air at position, upside of electric-controlled fuel injector body 38, the height of electric-controlled fuel injector body 38 Pressure oil through 41, the high pressure fuel feed hole 31 of needle-valve body 29, needle-valve body oil holding slot 32, the high pressure fuel made in the mesopore of needle-valve body bottom The hydraulic coupling upwards producing needle-valve 30, this power overcomes the spring force of oil nozzle spring 25 to make needle-valve lift, then high pressure fuel Fuel oil is outwards sprayed through needle-valve and the gap of the seat surface of needle-valve body, the spray orifice 34 of needle-valve body.

After electric magnet power-off, electromagnetic force disappears, and the effect lower seal ball at valve rod spring is taken a seat, and high pressure fuel is cut off, The pressure in cavity volume between valve seat 12 and piston rod 42 raises rapidly, promotes piston rod 42 to move downward until closing needle-valve, End of injection.

The deficiency of the electromagnet assembly of prior art is as shown in Figure 2, and the lower surface of iron core 3 is seated in electric magnet In the inner chamber seam plane of housing 9, the above and inner frame 1 of iron core 3 contacts, and is closed up iron core 3 by electromagnet housing 9 upper end Compressing, its result makes the biggest erection stress that the urceolus of iron core 3 produces, the serious permeability affecting iron core 3, so that electric The efficiency of Magnet is substantially reduced.

As shown in Figure 2 the weak point of the electromagnet assembly of prior art also resides in, electric magnet operationally, at ferrum Core inner will produce vortex flow, and coil itself also can generate heat, if these heats can not shed in time, by work of electromagnet Reliability produces strong influence, can burn electric magnet time serious, and the iron core 3 of 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 radiation of iron core, owing to the gap between iron core 3 and armature 6 only has 0.1mm and in rank During Railway transportation is dynamic, described gap the most constantly reduces and causes the circulating resistance of fuel oil very greatly, the iron core 3 of described prior art External cylindrical surface do not have fuel oil to flow through, and the circulation area of described iron core 3 endoporus only has the 13% of cylindrical area, it is clear that only pass through Endoporus heat radiation can not get good radiating effect, therefore the reliability of electric magnet can be produced impact.

3rd deficiency of the electromagnet assembly of prior art is, coil rack 51 does not has with the top of iron core 3 groove Preset clearance, during work of electromagnet described coil and skeleton all can fever expansion because the reserved space expanded, upper end, line The bottom surface of ring framework can only move down, and the normal neutral plane of described coil and skeleton moves down the most therewith, when electric magnet stops Only after work cooling, described coil and skeleton again can cooling meat, contraction now is no longer to revert in situ, but described coil Bouncing back to its normal neutral plane with the two ends of skeleton, electric magnet, after long-term work is expanded with heat and contract with cold repeatedly, causes line simultaneously Entirety is moved by ring framework gradually downward, and its lower surface is also by displacement the most gradually downward, and the bottom surface of coil rack once exceeds The low degree of iron core will affect the work of electric magnet, and the most described coil and skeleton can be dragged to pull while moving down and lead Line, pulls apart wire time serious and makes electric magnet lose efficacy.

4th deficiency of the electromagnet assembly of prior art is, only has one between inner frame 1 and electromagnet housing 9 Individual " O " shape sealing ring 52, this sealing ring, because the wiring rod diameter sealed only has 1mm, belongs to extra small diametric seal, at pressure It is susceptible to leakage of oil when of fluctuating bigger.

The deficiency of the control valve assembly of above-mentioned prior art is, in ball sealer 16 down periods, described ball sealer 16 begins Acted on by high pressure fuel hydraulic coupling eventually, need electric magnet spring to have the biggest spring force just can push down ball sealer 16 and make it sit Falling on the taper seat of valve seat 12, it is thus necessary to make electric magnet spring force increase, electric magnet spring force is a closing forces, electromagnetism Ferrum spring force wants unlatching after increasing and is necessary for requiring that on armature 6, electromagnetic force also and then to increase, and thus makes driving power consumption significantly Increase.

Meanwhile, the control valve assembly of prior art also has a more distinct issues to be that ball sealer 16 is opened front owing to being subject to To the effect of high pressure fuel hydraulic coupling, opening control valve, the magnetic field force of needs is relatively small, and after once opening, high pressure fuel is to close The active force of blocking 16 reduces the most suddenly a lot, opens the reduction suddenly of making a concerted effort of ball sealer, persistently opens to control valve, then Electromagnetic force must can be made also to want to increase suddenly, but this needs are unable to catch up with in gathering way of the magnetic flux density of electromagnetic field, Therefore the increase of electromagnetic force does not the most just reach this requirement, causes ball sealer 16 to be again switched off, after closedown suffered by ball sealer 16 Hydraulic coupling returns to again maximum, and then control valve is opened again, is so repeated several times the chatter causing ball sealer 16, until Electromagnetic force increases to the variation having the ability to overcome high pressure fuel hydraulic coupling, could persistently open.Equally in the closedown of control valve Also there will be above-mentioned situation in journey, this process causes impact for the accuracy of the flow of outflow control valve.

The deficiency of the control valve assembly of prior art also resides in, and the movement parts of described control valve includes ball sealer, ball sealer Seat, valve rod, armature, opening pad totally 5 parts, due to part is many and also the form tolerance control of fairlead screw thread and mesopore The factors such as difficulty is big cause manufacturing cost higher.

The deficiency of the control valve assembly of prior art also resides in, the valve rod 4 of the solid construction used, and adds motion matter Amount, affects 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 body 38 and valve seat 12 Sealing the radial seal mode using sealing ring 20, the material of described sealing ring 20 is plastic material, and not only intensity is low, seal effect The poorest, there is also the problem that sealing is degraded.

The deficiencies in the prior art shown in Fig. 2 also reside in, and again because the skin depth of valve seat 12 only has about 2mm, hold very much Easily cause valve seat 12 to deform, if the magnitude of interference of sealing ring 20 is big, is easily caused between the cavity volume of piston rod 42 and valve seat 12 and sends out Raw stuck, if the magnitude of interference of sealing ring 20 is little, then do not have reliable sealing function.Therefore the size Control of plastic seal ring Extremely difficult.

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

Summary of the invention

It is an object of the invention to the weak point existed for prior art Electrocontrolled high-pressure fuel injection equipment (FIE), it is provided that a kind of Good heat dissipation effect, coil and skeleton do not move down, seal reliable, it is possible to eliminates erection stress to the impact of iron core permeability, control There is not chatter in valve valve rod in switching process, dynamic response is rapider, and fuel injection amount is more accurate, processes easier automatically controlled High pressure fuel injection device.

The technical solution adopted for the present invention to solve the technical problems is, a kind of high reliability Electrocontrolled high-pressure fuel oil injection dress Put, including: fluid power amplifier unit, needle-valve and the needle-valve body being made up of electromagnet assembly, control valve assembly, piston bush and piston rod The fuel oil injecting-unit that constitutes, high-low pressure fuel oil runner is provided for Electrocontrolled high-pressure fuel injection equipment (FIE), filters, seal and automatically controlled Injector body, oil intake assembly, fastening swivel nut, it is characterised in that: in electromagnet assembly, have cylindrical be stepped diameters and in The electromagnet housing 9 of heart cavity volume cavity, iron core 3 is mounted concentrically in the stepped diameters reservoir body of electromagnet housing 9, electric magnet bullet Spring 2 is axially positioned between inner frame 1 cavity volume port and armature 6, coil rack 51 cladding coil 5 be assembled in iron core 3 to In the groove of under shed, high 3 tops of iron core are shaped with and allow pressurized position, iron core 3 upper end away from the electric magnet main flux circle through path Pylon omoplate, the upper surface of iron core 3 contacts with inner frame 1 lower surface, and downwardly open annular groove is offered in lower end, this annular Being equipped with the coil 5 being coated with by coil rack 51 in groove, coil rack 51 and iron core 3 annular groove top leave one for line The gap that ring framework expands；In control valve assembly, the valve rod body of rod is shaped with the cylinder table falling into the tapered opening of valve seat upper end Cone, and the angle of the valve seat opening cone angle A of described valve seat tapered opening is more than the valve rod truncated cone of valve rod cylinder table cone angle Body cone angle B, the taper hole of valve seat 12 upper end tapered opening coordinates with the truncated cone of hollow structure valve rod 4, to form valve rod 4 cone A up big and down small annular is had between the necking down of lower end with valve seat 12 upper end tapered opening and between the face of cylinder matched Gap.

Further, the sealing connected between wiring rod 54 and the inner frame 1 of 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 inner frame 1 hole wall and wiring rod 54 faces of cylinder, then adds The auxiliary seal effect of upper " O " shape sealing ring 52, can form sealing reliably.

Further, make owing to the material of described part is steel alloy and through Overheating Treatment, there is the highest hardness, The most in use its sealing effectiveness does not haves degeneration phenomenon.

The present invention also has the advantages that compared to prior art tool:

Good heat dissipation effect, the reliability of electric magnet improves further.The electromagnet core that the present invention is directed to prior art existence is cold But the weak point of weak effect, utilizes and leaves between the lower body diameter of iron core 3 and the diameter of bore of electromagnet housing 9 for fuel oil The gap of flowing so that fuel oil is in addition to can be from the centre bore outflow of iron core 3, it is also possible to from the outer surface of iron core 3 and electricity It is provided with between the inner surface of Magnet housing 9 between the gap of annular fuel flow and flows out simultaneously so that the surfaces externally and internally of iron core 3 is equal There is fuel oil to flow through, the film-cooled heat of electromagnet core can be made to increase by more than 87%, so that the surfaces externally and internally of iron core 3 all can obtain To sufficiently cooling, it is ensured that the reliability of electric magnet.

Coil and skeleton do not move down.The present invention is directed to causing because coil and coil rack expand with heat and contract with cold of prior art existence The weak point of coil, skeleton displacement, utilizes the bottom land in the upper surface of coil rack 51 and the groove of iron core 3 to leave 0.2mm Expansion clearance, can make coil 5, coil rack 51 at adstante febre, can be respectively to two ends at coil rack 51 neutral surface Expanding and stretch, when cooling, two ends can also bounce back respectively at neutral surface, thereby may be ensured that coil rack after long-term work The lower plane of 51 does not protrudes past beyond the lower surface of iron core 3, will not pull simultaneously yet and drag wire, solve because iron core 3 flatulence of heat type is cold The problem that the winding wire that contracting causes is torn.

Eliminate the erection stress impact on iron core permeability.The present invention is directed to the electromagnet core of prior art existence Erection stress affects the weak point of iron core permeability, utilizes the ferrum between the seam and the inner frame that are fixed on electromagnet housing 9 The cylinder table omoplate on core 3 top, allow iron core 3 pressurized position away from the path of main flux process so that iron core 3 pressurized position produce The distributed areas of raw compressive stress are also away from the path of main flux process, thus do not interfere with the magnetic capacity of iron core 3, can disappear Except the erection stress impact on electromagnet core magnetic capacity, electric magnet is made to produce bigger electromagnetism under same magnetic field intensity Power, thus improve the efficiency of electric magnet.

The present invention utilize the center-hole diameter of valve seat 12 be up big and down small have 0.0005 to 0.001mm trace poor Not, the high pressure fuel having between necking down and the valve seat 12 upper end tapered opening in valve rod 4 cone lower end enters valve rod 4 and valve Have in a up big and down small annular gap between the face of cylinder that seat 12 matches, the high pressure being full of in described annular gap 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 Any one side of the centre bore of 12, it is possible to reduce the frictional force between valve rod 4 and valve seat 12 and hydraulic clip clamp force.

Further, the present invention utilizes the twice annular balancing slit that the face of cylinder of valve rod 4 bottom is provided with, due to balancing slit In fuel pressure be to act on valve rod uniformly in the radial direction, hence in so that issuable hydraulic clip clamp force reduce About 75%, extremely advantageous to the frictional force between preventing and treating valve rod 4 and valve seat 12 locking and two parts of minimizing.Therefore can subtract Few hydraulic clip clamp force, makes stem movement smooth.

Inner frame and wiring rod seal reliable.The inner frame and the sealing of wiring rod that the present invention is directed to prior art existence can not The weak point leaned on, installs lip-type packing 53 additional between wiring rod 54 and inner frame 1, and lip-type packing 53 lower end 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 inner frame 12 hole wall and wiring rod 10 circle On cylinder, add the auxiliary seal effect of " O " shape sealing ring 9, sealing reliably can be formed.

There is not chatter in control valve valve rod in switching process, dynamic response is rapider, and fuel injection amount is more accurate.This The bright motion liquid body pressure influence of valve rod for prior art existence, driving power consumption are high, flow error is big, affect emitted dose The weak point of precision, the present invention utilizes the taper hole of valve seat 12 upper end tapered opening to coordinate with the truncated cone of valve rod 4, valve The valve seat opening cone angle A angle of the tapered opening of seat 12 angle more than described valve rod truncated cone cone angle B so that the valve rod truncated cone And the equal diameters on the face of cylinder of the sealed diameter between valve seat tapered opening contact surface and valve rod 4, so that valve rod 4 is bored The hydraulic oil having between the necking down of body lower end with the valve seat 12 upper end tapered opening active force phase to valve rod 4 necking down both sides Deng, thus ensure that hydraulic oil will not produce axial force to valve rod, owing to valve rod is not subjected to the axial liquid pressure of highly pressurised liquid, also Avoid the need for prior art so high spring force such as to seal, it is possible to reduce the power consumption required for switching control pilot and Flow error, it is achieved being precisely controlled of emitted dose so that the motion of valve rod not liquid body pressure influence.

Further, it is also due to hydraulic oil and valve rod will not be produced axial force interference, so the switch of control valve is the most not Have chatter phenomenon to occur, such that it is able to improve the precision of injection flow.

Dynamic response is fast.The present invention is directed to art of solid valve rod and be affected due to quality ambassador's valve rod dynamic response Weak point, use the valve rod 4 of hollow structure, due to very light weight, be conducive to improving the switching speed of valve rod 4, therefore may be used To shorten the dynamic response time of valve rod 4.

Seal reliable, do not have sealing and degrade.The present invention is directed to prior art Electrocontrolled high-pressure fuel injection equipment (FIE) exist Valve seat 12 and electric-controlled fuel injector body 38 between use the sealing ring made of plastic material to carry out the sealing effectiveness of radial seal Difference, being prone to cause valve seat orifice deformation and plastic material to be prone to aging technical problem, the present invention utilizes the lower plane of valve seat 12, work The closeest to plane of the plane that the upper and lower plane of plug sleeve 44, the counterbore plane of electric-controlled fuel injector body 38 center cavity volume are constituted 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 body 38 center cavity volume The precision of counterbore plane is to ensure that the height of the piston bush 44 that the high pressure oil through 41 with electric-controlled fuel injector body 38 is connected It is pressed into the sealing between oilhole 18 and between the oil through 43 of piston bush 44 and valve seat 12.Owing to using flat seal form to lead The deflection of the deformation ratio prior art employing radial seal form causing described valve seat 12, piston bush 44 center hole is much smaller, It is not result in that valve rod is stuck.

Further, owing to the sealing plane of electric-controlled fuel injector body 38 center cavity volume is for exposing plane, electronic control injection is made Device body 38 processing becomes easier to.

Further, make owing to the material of described part is steel alloy and through Overheating Treatment, there is the highest hardness, The most in use its sealing effectiveness does not haves degeneration phenomenon.

Reduce manufacturing cost.The present invention is directed to the weak point that how relatively costly prior art control valve part is, use Valve rod 4 in the middle part of the tapered opening on the truncated cone and valve seat 12 top seal, valve rod 4 lower cylinder of employing and valve seat 12 center The cylindrical hole of cavity volume guides, and is not required to ball sealer and sealed ball seat, and matches with valve seat orifice in the lower cylindrical face of valve rod, it is not necessary to It is further added by guide sleeve structure, therefore avoids the unmanageable factor of form and position tolerance of fairlead screw thread and mesopore, also subtract simultaneously Lack number of parts, thus reduce manufacturing cost.

The present invention is directed to the oil return processing low pressure oil return inclined hole 39 on electric-controlled fuel injector body 38 that prior art uses The weak point of the processing difficulties that mode is caused, the present invention utilizes the ring that electric-controlled fuel injector body 38 and piston rod 42 are formed Shape gap 45 makes the fuel oil leaked from needle-valve and piston fit clearance return to low pressure chamber 55, such that it is able to eliminate because of electric-controlled fuel injector Body needs to add the problem that the thin spill port of section chief causes processing difficulties.Processing is made to be easier to.

The present invention has control valve center arrangement, exposes plane hard seals, center slot oil return feature.

Accompanying drawing explanation

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 prior art.

In figure: 1 inner frame, 2 electric magnet springs, 3 iron cores, 4 valve rods, 5 coils, 6 armature, 7 damping springs, 8 pads, 9 electricity Magnet housing, 10 fastening swivel nuts, 11 sealing rings, 12 valve seats, 13 pads, 14 fairleads, 15 fastening swivel nuts, 16 ball sealers, 17 is close Blocking seat, 18 high pressure fuel feed holes, 19 high pressure oil outlets, 20 sealing rings, 21 sealing ring liners, 22 backstop boss, 23 low pressure oil returns Hole, 24 oil nozzle spring adjusting pads, 25 oil nozzle springs, 26 spring spools, 27 needle lift adjusting pads, 28 fastening swivel nuts, 29 needle-valves Body, 30 needle-valves, the oilhole of 31 high pressure, 32 oil holding slots, 33 annular gaps, 34 spray orifices, 35 oil inlet filter elements, 36 oil-feed bolts, 37 enter Oil draining bolt sealing gasket, 38 electric-controlled fuel injector bodies, 39 low pressure oil return inclined holes, 40 logical oil grooves, 41 high pressure oil throughs, 42 pistons Bar, 43 oil throughs, 44 piston bush, 45 annular gaps, 46 opening pads, 47 electric magnet spring adjusting pads, 50 inclined oil hole of air, 51 coils Skeleton, 52 " O " shape sealing ring, 53 lip-type packings, 54 wiring rods, 55 low pressure chamber 55, A valve seat opening cone angle, the B valve rod truncated cone Cone angle.

Detailed description of the invention

Refering to Fig. 1.In embodiment described below, a kind of high reliability Electrocontrolled high-pressure fuel injection equipment (FIE), including: by The preposition control parts that electromagnet assembly and control valve assembly are constituted, the fluid power amplifier unit being made up of piston bush and piston rod, The fuel oil injecting-unit that is made up of needle-valve and needle-valve body, provide 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 body, oil intake assembly, fastening swivel nut, switching swivel nut.The iron core 3 of electric magnet, rank The parts such as ferrum 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 body 38 is concentric.In electromagnet assembly, electromagnet housing 9 cylindrical is stepped diameters, center cavity volume cavity, iron core 3 Being mounted concentrically in the stepped diameters reservoir body of electromagnet housing 9, electric magnet spring 2 is axially positioned on inner frame 1 cavity volume port And between armature 6, the coil 5 of coil rack 51 cladding is assembled in the groove that iron core 3 is downwardly open, and iron core 3 top is shaped with Allow pressurized position, iron core 3 upper end away from the electric magnet main flux cylinder table omoplate through path, with internal skeleton on the upper surface of iron core 3 Frame 1 lower surface contacts, lower end offers downwardly open annular groove, is equipped with and is coated with by coil rack 51 in this annular groove Coil 5, a gap expanded for coil rack is left at coil rack 51 and iron core 3 annular groove top.

One cylindrical is the electromagnet housing 9 of stepped diameters and the center cavity volume cavity with concentric multi-grade diameter, with one heart It is assemblied in the outside of electromagnet housing 9 to play Motionless electromagnetic iron acting fastening swivel nut 10 and connect firmly on switching swivel nut 48, described turn Connecing swivel nut 48 to be connected in one heart on the external screw thread of electric-controlled fuel injector body 38, described switching swivel nut 48 is successively by valve seat 12, piston What set 44 was connected in electric-controlled fuel injector body 38 exposes in plane, and iron core 3 is assemblied in the reservoir body of electromagnet housing 9 center, electricity Magnet spring 2 is axially positioned between inner frame 1 cavity volume port and armature 6, and the coil 5 of coil rack 51 cladding is assembled in ferrum In the groove that core 3 is downwardly open, described coil 5 wire two ends are connected with two wiring rods 54 respectively.Iron core 3 top is shaped with and allows Pressurized position, iron core 3 upper end is away from the cylinder table omoplate in the path of electric magnet main flux process.With internal skeleton on the upper surface of iron core 3 Frame 1 lower surface contacts, and the end face of getting out of a predicament or an embarrassing situation of the cylinder table that the top of iron core 3 is shaped with is put down with electromagnet housing 9 cavity volume upper step Face contacts, by electromagnet housing 9 cavity volume upper end open distortion in rolling make the cylinder table omoplate of iron core 3 be connected in inner frame 1 with Between electromagnet housing 9.At the Upper cylindrical shoulder shoulder blade face of iron core 3 and adjacent electromagnet housing 9 annular step surface and Leave the gap for fuel flow between lower body diameter and the diameter of bore of electromagnet housing 9 of iron core 3 so that fuel oil except Can be beyond the centre bore of iron core 3 flows out, it is also possible to set between the outer surface and the inner surface of electromagnet housing 9 of iron core 3 Have between the gap of annular fuel flow and flow out simultaneously so that the surfaces externally and internally of iron core 3 all has fuel oil to flow through, so that iron core 3 It is adequately cooled；Downwardly open annular groove is offered in iron core 3 lower end, is equipped with by line in the annular groove of iron core 3 The coil 5 of ring framework 51 cladding, coil rack 51 and iron core 3 groove top leave a gap expanded for coil rack.

There is central cavity and upper end is that the electric-controlled fuel injector body 38 exposing plane is the most concentric by switching swivel nut 48 By piston bush 44, valve seat 12, being connected on the upper transverse plane of electric-controlled fuel injector body 38, pad 13 is connected in by fastening swivel nut 15 On the step plane of valve seat 12.Make high pressure oil outlet 19 with one heart on the central circular cavity volume top of piston bush 44, extrude at height Oilhole 19 upper end is shaped with what inclined hole was shaped with valve seat 12 upright opening and is connected, and the inclined hole being shaped with by valve seat 12 passes straight through to valve The cavity volume that the necking down of seat 12 and valve rod 4 is constituted.The opposite side of piston bush 44 is shaped with one and describes with the center circle of piston bush 44 The high pressure fuel feed hole 18 that chamber is connected, described high pressure fuel feed hole 18 lower end is by the hole of a vertical direction with electric-controlled fuel injector originally High pressure oil through 41 on body 38 is connected.Also be shaped with on piston bush 44 inclined oil hole of air 50 (in figure shown in dotted line) its lower end with The annular gap 45 that the central circular cavity volume of electric-controlled fuel injector body 38 is constituted with piston rod 42 is connected, its upper end and valve seat The low pressure spill port 23 being shaped with on 12 is connected, and the low pressure spill port 23 that valve seat 12 is shaped with is connected with low pressure chamber 55 again, energy The fuel oil leaked the fit clearance with piston bush with needle-valve body and piston from needle-valve is enough made to flow in low pressure chamber 55.Valve seat Cone valve port is made on 12 tops with one heart, has below valve rod 4 valve port conical with described valve seat 12 of ladder cylindrical and hollow The central circular cavity volume made with one heart matches, and is shaped with the truncated cone in the middle part of valve rod, and the described truncated cone is cylinder table cone, falls into valve In the bellmouth of seat 12 upper end tapered openings, and the cone angle A of described valve seat 12 upper end tapered opening is more than in described valve rod The equal diameters on the face of cylinder of the valve rod truncated cone cone angle B in portion, the sealed diameter between both contact surfaces and valve rod 4, in the middle part of valve rod 4 It is provided with between necking down and the valve seat 12 upper end tapered opening of cone lower end and fluid pressure suffered by valve rod 4 two ends is cancelled each other Dead slot.It is shaped with backstop boss 22 in fastening swivel nut 15 lower central cavity volume, changes described backstop by the thickness of regulation pad 13 Gap between the cone upper step plane of boss 22 and valve rod 4, in order to the control valve throw of lever.Armature 6 is concentrically mounted on The middle part of valve rod 4, the upper plane of armature 6 is spacing by the opening pad 46 being stuck in valve rod 4 necking down position, and damping spring 7 supports Between armature and fastening swivel nut 15, electric magnet spring 2 is concentrically mounted on valve rod 4 Upper cylindrical shoulder shoulder blade, described electric magnet Between spring 2 with inner frame 1, concentric installation electric magnet spring adjusting pad 47 is in order to adjust the pretightning force of electric magnet spring, valve rod 4 It is in normally off under the effect of electric magnet spring 2.Electric-controlled fuel injector body 38 upper stage terrace installs pad with one heart 8, electromagnet housing 9 is concentrically mounted on above pad 8, is ensured on iron core lower surface and armature 6 by the thickness of regulation pad 8 Gap between end face.Iron core 3, inner frame 1 are stacked in the center cavity volume of electromagnet housing 9 successively, by 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 arranged on iron core 3 In annular groove, the bottom land of the upper plane of coil 5 upper coil skeleton 51 and the annular groove of described iron core leaves the gap of 0.2mm.With tightly Gu swivel nut 10 is connected on electric-controlled fuel injector body 38 by electromagnet housing 9, with sealing ring 11 to electromagnet housing 9 and switching Seal between swivel nut 48, seal between switching swivel nut 48 and electric-controlled fuel injector body 38 with sealing ring 49.

It is mounted concentrically in the electric-controlled fuel injector body 38 center cavity volume cavity with cavity volume cavity concentric with external cylindrical surface Valve seat 12, fastening pad used by valve seat 12 13 and fastening swivel nut 15, the valve rod 4 of concentric inserted valve seat 12 central cavity, with And with the damping spring 7 of valve rod 4 concentric fits, armature 6, pad 8 and electric magnet spring 9.Valve rod 4 is shaped with employing to be had and alleviates matter The blind hole of the hollow structure of amount, being shaped with an angle in the middle part of valve rod is the truncated cone of B, and the described truncated cone falls into end cone on valve seat 12 Angle be A tapered opening in seal, and the valve seat opening cone angle A of described valve seat 12 upper end tapered opening is more than valve rod The angle of the valve rod truncated cone cone angle B of the truncated cone, the diameter phase on the sealed diameter between both contact surfaces and the face of cylinder of valve rod 4 Deng, it is provided with fluid pressure suffered by valve rod 4 two ends mutual between necking down and the valve seat 12 upper end tapered opening of valve rod 4 cone lower end The dead slot offseted, wherein, the high pressure of side dead slot connection downward-sloping straight-through electric-controlled fuel injector body 38 bottom of valve seat 12 leads to Oilhole 41.

The height that the high pressure fuel feed hole 18 being shaped with in the side of piston bush 44 is shaped with electric-controlled fuel injector body 38 side Pressure oil through 41 connects, and the oil inlet passage phase of the inclined hole being shaped with by electric-controlled fuel injector body 38 side and oil-feed bolt 36 Logical, oil-feed bolt seal pad 37 is arranged between oil-feed bolt 36 and body 38 and seals, and fills with one heart in the middle of oil-feed bolt 36 There is oil inlet filter element 35, fuel oil is filtered.Lower plane concentric fits needle-valve body 29 and needle-valve at electric-controlled fuel injector body 38 30, the side at needle-valve body 29 is shaped with the high pressure fuel feed hole 31 of inclination and the high pressure oil through 41 of electric-controlled fuel injector body 38 side It is connected, through to the inclined hole of oil-feed bolt 36 correspondence.The circular central cavity volume of piston bush 44 and the piston with ladder cylindrical 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, is living The top of stopper rod 42 forms a volume that can store high pressure fuel with the circular central cavity volume of piston bush 44, and this volume described 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, by needle-valve 30, needle-valve body 29 is applied pressure, and after valve rod 4 lifts, control valve is in and beats Open state, the high pressure fuel in this volume described forms path by oil through 43 and low pressure chamber 55, makes the top of piston rod 42 Fuel pressure reduce, so that the pressure of needle-valve 30 is reduced by piston rod 42.

Oil holding slot 32 it is shaped with, the high pressure oilhole 31 on described needle-valve body and oil holding slot 32, needle-valve body at the middle part of needle-valve body It is connected with the annular gap 33 between needle-valve, and passes straight through to needle-valve sealed seat surface.Needle lift adjusting pad 27 is arranged on needle-valve In order to the lift of metering pin valve between 30 and piston rod 42, the endoporus step surface of spring spool 26 is seated in transverse plane on needle-valve On, oil nozzle spring adjusting pad 24, oil nozzle spring 25 are supported on electric-controlled fuel injector body 38 lower stage terrace and spring spool successively The chien shih needle-valve of 26 is in normally off.

Further, the sealing between wiring rod 54 and inner frame 1 uses lip-type packing 53, when sealing ring is by high pressure During impact, the lip of lip-type packing 53 is pressed on inner frame 1 hole wall and wiring rod 54 faces of cylinder, adds " O " shape and seals The auxiliary seal effect of circle 52, can form sealing reliably.

During the work of fuel-injected device, coil switch power, the air gap between iron core 3 and armature 6 produces magnetic flux, makes Armature 6 produces electromagnetic force upwards, overcomes the spring force of electric magnet spring 2 to make valve rod 4 move upward, and the taper at valve seat 12 is opened Just an opened gap being available for high pressure fuel circulation, the high pressure fuel warp of outflow is defined between mouth and the truncated cone of valve rod 4 The low of 1 inner frame is flowed to the low pressure spill port 23 of valve rod 4 opened gap, fastening swivel nut 15 by high pressure oil outlet 19, valve seat 12 Pressure chamber 55.Now piston bush 44 reduces rapidly with pressure in the center cavity volume of piston rod 42, the hydraulic coupling that piston rod upper end is subject to Reduce the most rapidly, and via the high pressure oil through 41 of electric-controlled fuel injector body, needle-valve body high pressure fuel feed hole 31 through to needle-valve The pressure that the high pressure fuel of the oil holding slot 32 of body acts on needle-valve is the highest, along with the center of piston bush 44 with piston rod 42 In cavity volume pressure reduce further until act on the pressure of high pressure fuel on needle-valve can overcome oil nozzle spring elastic force and and During the hydraulic coupling on piston rod top, needle-valve 30 will promote piston-rod lower end to make piston rod upwards transport by needle lift adjusting pad 27 Dynamic, high pressure fuel sprays through the gap of needle-valve with needle-valve body 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 effect of electric magnet spring 2, and the circulation path of high pressure oil outlet 19 is cut off, piston bush 44 with The center cavity volume intermediate fuel oil pressure of piston rod 42 rises rapidly, and the pressure acting on piston rod 42 upper surface rises the most rapidly, Diameter due to piston rod 42 is more than the diameter of needle-valve 30, and piston rod 42 will promote needle-valve the most descending, at the connection of oil nozzle spring Needle-valve is made to close under cooperation, end of injection.

Claims (10)

1. a high reliability Electrocontrolled high-pressure fuel injection equipment (FIE), including: by electromagnet assembly, control valve assembly, piston bush and Piston rod constitute fluid power amplifier unit, the fuel oil injecting-unit being made up of needle-valve and needle-valve body, for Electrocontrolled high-pressure fuel oil spray Device provides high-low pressure fuel oil runner, filters, seals and electric-controlled fuel injector body, oil intake assembly, fastening swivel nut, and its feature exists In: in electromagnet assembly, electromagnet housing (9) cylindrical is the center cavity volume cavity of stepped diameters, and iron core (3) is mounted concentrically at In the stepped diameters reservoir body of electromagnet housing (9), electric magnet spring (2) is axially positioned on inner frame (1) cavity volume port and rank Between ferrum (6), the coil (5) that coil rack (51) is coated with is assembled in the groove that iron core (3) is downwardly open, on iron core (3) Portion is shaped with and allows pressurized position, iron core (3) upper end away from the electric magnet main flux cylinder table omoplate through path, the upper end of iron core (3) Contacting with inner frame (1) lower surface on face, downwardly open annular groove is offered in lower end, is equipped with by coil in this annular groove The coil (5) that skeleton (51) is coated with, coil rack (51) and iron core (3) annular groove top are left one and are expanded for coil rack Gap；In control valve assembly, the valve rod body of rod is shaped with the cylinder table cone falling into the tapered opening of valve seat upper end, and described The angle of the valve seat opening cone angle A of valve seat (12) tapered opening is more than the valve rod truncated cone cone angle B of valve rod cylinder table cone angle, The taper hole of valve seat upper end tapered opening coordinates with the truncated cone of hollow structure valve rod (4), to form valve rod (4) cone lower end A up big and down small annular gap is had between necking down with valve seat (12) upper end tapered opening and between the face of cylinder matched.

2. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: upper at iron core (3) Cylinder table omoplate face, portion and adjacent electromagnet housing (9) annular step surface and the lower body diameter of iron core (3) and electromagnetism The gap for fuel flow is left, meanwhile, at upper surface and the iron core of coil injection article between the diameter of bore of iron-clad body (9) (3) bottom land of bottom annular groove leaves the expansion clearance of 0.2mm.

3. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: fastening swivel nut (10) is led to Electromagnet housing (9), pad (8) are connected in electric-controlled fuel injector body by external screw thread with one heart that cross electric-controlled fuel injector body (38) (38) in center cavity volume plane.

4. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: the upper end of iron core (3) Face contacts with inner frame (1) lower surface, get out of a predicament or an embarrassing situation end face and electromagnet housing (9) the cavity volume upper stage of the cylinder table that top is shaped with Rank plane contact, in making the cylinder table omoplate of iron core (3) be connected in by electromagnet housing (9) cavity volume upper end open distortion in rolling Between skeleton (1) and electromagnet housing (9).

5. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: upper at iron core (3) Cylinder table omoplate face, portion and adjacent electromagnet housing (9) annular step surface and the lower body diameter of iron core (3) and electromagnetism The gap for fuel flow is left between the diameter of bore of iron-clad body (9).

6. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: have central cavity and Center cavity volume plane electric-controlled fuel injector body (38), by the female thread of fastening swivel nut (15) electric-controlled fuel injector body (38) successively With one heart pad (13), valve seat (12), piston bush (44) are connected in the center cavity volume counterbore plane of electric-controlled fuel injector body (38) On, make the described valve seat of connection (12), piston bush (44), the oil through (43) of electric-controlled fuel injector body (38), high pressure fuel feed hole (18), high pressure oil outlet (19), high pressure oil through (41) are all seated in valve seat (12), piston bush (44), electric-controlled fuel injector originally Between body (38) within the plane of contact.

7. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 6, it is characterised in that: at piston bush (44) High pressure oil outlet (19) is made on central circular cavity volume top with one heart, is shaped with inclined hole and valve seat (12) in high pressure oil outlet (19) upper end Be shaped with upright opening be connected, and the inclined hole being shaped with by valve seat (12) passes straight through to the necking down institute of valve seat (12) and valve rod (4) The cavity volume constituted.

8. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 7, it is characterised in that: the one of piston bush (44) Side is shaped with a high pressure fuel feed hole (18) being connected with the central circular cavity volume of piston bush (44), described high pressure fuel feed hole (18) Lower end is connected with the high pressure oil through (41) on electric-controlled fuel injector body (38) by the hole of a vertical direction；Described piston The central circular cavity volume of an inclined oil hole of air (50), piston bush (44) lower end and electric-controlled fuel injector body (38) also it is shaped with on set (44) The annular gap (45) constituted with piston rod (42) is connected, low pressure spill port (23) phase that upper end and valve seat (12) are shaped with Connection, the low pressure spill port (23) that valve seat (12) is shaped with is connected with low pressure chamber (55) again so that from needle-valve and needle-valve body with And piston flows in low pressure chamber (55) with the fuel oil of leakage in the fit clearance of piston bush.

9. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 1, it is characterised in that: valve seat (12) top is same The heart makes cone valve port, has below valve rod (4) valve port conical with described valve seat (12) of ladder cylindrical and hollow concentric The central circular cavity volume made matches, and valve rod (4) truncated cone falls in the bellmouth of valve seat (12) upper end tapered opening, in It is provided with fluid pressure suffered by valve rod (4) two ends mutual between necking down and valve seat (12) the upper end tapered opening of cone lower end, portion The dead slot offset, wherein, the height of connection valve seat (12) downward-sloping straight-through electric-controlled fuel injector body (38) bottom, side of dead slot Pressure oil through (41).

10. high reliability Electrocontrolled high-pressure fuel injection equipment (FIE) as claimed in claim 8, it is characterised in that: piston bush (44) Circular central cavity volume matches with the piston rod (42) with ladder cylindrical, and the lower end of piston rod (42) is adjusted by needle lift Pad (27) is pressed in the centre of the upper plane of needle-valve (30), and the circular central at the top of piston rod (42) with piston bush (44) is held Chamber forms a cavity volume that can store high pressure fuel, and this cavity volume accommodates the high pressure fuel from high pressure fuel feed hole (18), when When valve rod (4) is closed, the high pressure fuel at the top of piston rod (42) makes valve rod be pressed on needle-valve (30), passes through pin Valve (30) applies pressure to needle-valve body (29), and after valve rod (4) lifts, control valve is in open mode, the high pressure in this cavity volume Fuel oil forms path by oil through (43) with low pressure chamber (55), makes the fuel pressure at the top of piston rod (42) reduce, thus Make piston rod (42) that the pressure of needle-valve (30) to be reduced.