CN105201716A

CN105201716A - Novel common-rail fuel injector

Info

Publication number: CN105201716A
Application number: CN201510737981.2A
Authority: CN
Inventors: 龙美彪; 欧阳玲湘; 黄民备; 刘成; 谭四喜
Original assignee: NANYUE ELECTRONIC CONTROL (HENGYANG) INDUSTRY TECHNOLOGY Co Ltd
Current assignee: NANYUE ELECTRONIC CONTROL (HENGYANG) INDUSTRY TECHNOLOGY Co Ltd
Priority date: 2015-11-03
Filing date: 2015-11-03
Publication date: 2015-12-30
Anticipated expiration: 2035-11-03
Also published as: CN105201716B

Abstract

The invention discloses a novel common-rail fuel injector. The common-rail fuel injector comprises a fuel injector body component, an electromagnetic valve component and a fuel injection nozzle component, wherein the electromagnetic valve component and the fuel injection nozzle component are mounted at upper and lower ends of the fuel injector body component respectively. The fuel injection control function is realized in such a manner that the two-position three-way electromagnetic control valve component and the fuel injection nozzle component with adjustable opening pressure are combined, the fuel injector is simpler in structure, and the initial fuel injection point and the fuel injection quantity can be controlled flexibly. An electromagnetic control valve core of the fuel injector is designed to adopt a fuel pressure self-balancing structure, the fuel injection starting response speed can be significantly increased, the driving current of an electromagnet can be significantly reduced, the service life of the electromagnet is effectively prolonged, and the reliability of the electromagnet is effectively improved. The common-rail fuel injector is free of pressure control chamber structures, outgoing fuel throttling hole control ball valves and control piston couple pairs of other traditional common-rail fuel injectors, so that precise parts and components with great machining technology difficulty are not required, the machining difficulty is greatly reduced, and the technological cost is correspondingly reduced.

Description

A kind of New Common Rail oil sprayer

Technical field

The present invention relates to and be applicable to diesel engine common rail system oil atomizer, particularly a kind of New Common Rail oil sprayer that can control beginning of injection and fuel injection quantity flexibly.

Background technique

At present, domestic and international widely used common-rail injector is mainly made up of solenoid valve, pressure amplification system and injector nozzle matching parts etc.Wherein, pressure amplification system is primarily of the composition such as pressure controling chamber, control piston couple pair, fuel-displaced orifices controls ball valve, needle-valve body oil holding slot.Wherein, pressure controling chamber is mainly made up of control piston top, meter in hole, fuel-displaced throttle orifice.The size of pressure controling chamber's volume determines speed of response when needle-valve opens and closes.The face area of the Flow characteristics of meter in hole and fuel-displaced throttle orifice and conformity and control piston determines injector valve and opens stability, the shortest injection process and stable minimum fuel injection quantity; The realization of these functions all needs the part of very high manufacturing accuracy.Such as, in order to control Flow characteristics and the conformity in meter in hole and meter out hole, need by the method for high-accuracy processing, the error in geometrical form in meter in hole and meter out hole to be controlled within permitted value.

Market Application comparison is extensive at home for the common-rail injector that company of German Bosch produces.Usually, the working principle of Bosch common-rail injector is all utilize the pressure in electromagnetic type control valve or piezoelectricity type control valve pilot pressure control room to change the movement controlling injector valve, in pressure controling chamber, the change of pressure causes moving axially of injector valve, thus makes the spray orifice of nozzle needle valve body open or close.In typical Bosch common-rail injector, the pressure of pressure controling chamber is regulated by two throttle orifices passing into pressure controling chamber, wherein, a fuel-displaced throttle orifice is formed on a throttle plate, meter in hole be formed in one limit out this pressure controling chamber and surround in the lining at control piston top.The shortcoming of above-mentioned typical Bosch common-rail injector structure is: the necessary range of tolerable variance of works fine mode of oil sprayer is only had and just can be reached by the manufacture cost of very complicated detection and costliness, especially when to coordinate between meter in hole and fuel-displaced throttle orifice according to the injection pressure of injector in pressure controling chamber diameter than time.

At present, technological level and the machining equipment of oil-fired system manufacturing enterprise of general China all can not meet the demands completely, and conforming product rate is low, therefore constrains the promotion and application of common rail system to a certain extent.

Summary of the invention

The present invention be intended to design a kind of lower than traditional common-rail injector technology difficulty, structure is simple, be easy to the New Common Rail oil sprayer that controls.

Technical problem to be solved by this invention can be achieved through the following technical solutions:

A kind of New Common Rail oil sprayer, comprising:

Oil injector body parts, described oil injector body parts at least comprise an oil injector body, described oil injector body is provided with outside thread, oil returning pipe joint mounting hole, inlet connector mounting hole and lower outside thread, described upper and lower outside thread is separately positioned on the upper and lower end of oil injector body outer rim, and described oil returning pipe joint mounting hole and inlet connector mounting hole are arranged on position, oil injector body upper middle; In described oil injector body, be provided with electromagnetic valve components mounting hole, oil input channel, the first back oil road, the second back oil road, the first middle oil duct, the second middle oil duct and oil nozzle member mounting holes, wherein electromagnetic valve components mounting hole is divided into from top to bottom coaxial to arrange and the electromagnetic valve components that internal diameter reduces successively installs hole, the first electromagnetic valve components installs intermediate hole, the second electromagnetic valve components installs intermediate hole and electromagnetic valve components installs lower opening; The upper end of installing intermediate hole in described second electromagnetic valve components is provided with one section of internal thread;

The entrance of described oil input channel is communicated with at the bottom of the hole of described inlet connector mounting hole, the outlet of oil input channel is installed at the bottom of the hole of intermediate hole with described second electromagnetic valve components and is communicated with, the axis being parallel of described first back oil road and described electromagnetic valve components mounting hole is arranged, install in described electromagnetic valve components at the bottom of the hole in hole and be configured with radial oil-return groove, the entrance of described first back oil road is communicated with described oil-return groove, and the outlet of this first back oil road is communicated with the neutral position of described second back oil road; The hole wall that entrance and described second electromagnetic valve components of described second back oil road install intermediate hole is communicated with, and the outlet of the second back oil road is communicated with at the bottom of the hole of described inlet connector mounting hole; Described first middle oil duct, the second middle oil duct be arranged in parallel, wherein said first middle oil duct and described electromagnetic valve components install lower opening, described oil nozzle member mounting holes coaxially arranges and is interconnected, and the internal diameter of the first middle oil duct is less than described electromagnetic valve components and installs the internal diameter of lower opening and the internal diameter of oil nozzle member mounting holes; Second electromagnetic valve components suitable for reading and described of described second middle oil duct is installed at the bottom of the hole of intermediate hole and is communicated with, and the end opening of the second middle oil duct is communicated with the bottom surface of described oil injector body; Install in described electromagnetic valve components at the bottom of the hole of lower opening and be configured with lower positioning hole; The bottom surface of described oil injector body is configured with positioning hole of some ends;

Electromagnetic valve components, described electromagnetic valve components comprises electromagnet, electromagnet compression spring, armature lever, armature, locking swivel nut, valve seat, adjustment pad, control valve spring, control valve spring pad, spring seat, control valve seat, control spool, return spring pad, return spring, electromagnet packing ring, O RunddichtringO, the very tight cap of electromagnetism and electromagnet spring;

The external frame of described electromagnet is made up of the upper cylindrical section coaxially arranged and lower cylindrical section, the external diameter wherein going up cylindrical section be greater than described lower cylindrical section external diameter and the internal diameter that the external diameter of described upper cylindrical section and described electromagnetic valve components install hole to carry out sealing adaptive, cylindrical section is provided with an annular sleeveless jacket on described, in described electromagnet, is coaxially arranged with armature rod aperture and regulator bolts hole from the bottom to the top;

Described armature lever from top to bottom by different-diameter and coaxial the first bar section, the second bar section, the 3rd bar section and the 4th bar section arranged form, the wherein largest diameter of the second bar section, the diameter of the first bar section and the 3rd bar section is all less than the diameter of described second bar section, and the diameter of the 4th bar section is less than the diameter of the 3rd bar section;

The external frame of described armature is from top to bottom made up of the flange part coaxially arranged, the first cylindrical portion and the second cylindrical portion, the external diameter of described flange part is greater than the external diameter of the first cylindrical portion, the external diameter of the first cylindrical portion is greater than the external diameter of the second cylindrical portion, the bottom surface of described flange part is the face of being inclined upwardly, and has armature rod aperture in the center configuration of described armature;

The excircle of described locking swivel nut is provided with outside thread, is provided with endoporus in locking swivel nut, and locking swivel nut bottom surface is provided with annular frustum wide at the top and narrow at the bottom;

Axial valve opening, axial taper valve opening, control valve seat mounting hole be provided with radial valve opening in described valve seat is from top to bottom coaxially disposed with in described valve seat, the inner of described radial valve opening is communicated with the hole wall of described axial valve opening, the outer end of this radial valve opening is communicated with the periphery wall of described valve seat, the internal diameter of described axial valve opening is less than the internal diameter of described control valve seat mounting hole, described axial taper valve opening is up-small and down-big, its small end inner diameter equals the internal diameter of described axial valve opening, and large end internal diameter is less than the internal diameter of described control valve seat mounting hole;

Described control valve seat outer circumferential face is made up of the first external cylindrical surface coaxially arranged and the second external cylindrical surface, and the first external cylindrical surface is positioned at the top of described second external cylindrical surface and the diameter of the first external cylindrical surface is less than the diameter of the second external cylindrical surface; From top to bottom be disposed with axial taper to control valve opening at the center of described control valve seat, axially control valve opening and oil return center hole; It is up big and down small cone shape hole that described axial taper controls valve opening, the large end internal diameter that described axial taper controls valve opening equals the large end internal diameter of described axial taper valve opening, the small end inner diameter that described axial taper controls valve opening equals the described internal diameter axially controlling valve opening, and the internal diameter of described oil return center hole is greater than the described internal diameter axially controlling valve opening;

In described control valve seat, be also provided with oil-feed passageway and fuel-displaced passageway, the entrance in wherein said oil-feed passageway is communicated with the bottom surface of described control valve seat, and the outlet in oil-feed passageway is communicated with the described face, hole axially controlling valve opening; The entrance in described fuel-displaced passageway is communicated with the end face of described control valve seat, and the outlet in fuel-displaced passageway is communicated with the end face of described control valve seat; Be configured with the upper positioning hole identical with quantity with described lower position of positioning hole in the bottom surface of described control valve seat and be configured with some oil-return grooves be interconnected, these oil-return grooves are communicated with described oil return center hole and are communicated with the second external cylindrical surface of described control valve seat simultaneously;

The external frame of described control spool is from top to bottom made up of upper cylindrical section, sealing guide section, upper conical section, lower conical section, lower cylindrical section successively, the external diameter of wherein said upper cylindrical section is less than the external diameter of described sealing guide section, described upper conical section is up big and down small conical section, described lower conical section is up-small and down-big conical end, on this, the Outside diameter of conical section equals the diameter of described sealing guide section, on this, the end diameter of conical section equals the end diameter of described lower conical section, and the Outside diameter of described lower conical section equals the diameter of described lower cylindrical section; The end face periphery of described sealing guide section is provided with conical seal (contact) face;

Described control valve spring pad, return spring pad, adjustment pad all offer through hole;

During assembling, first described spring seat, control valve spring pad, control valve spring are placed in described electromagnetic valve components successively and install in lower opening, wherein control valve spring is between described spring seat, control valve spring pad, bottom surface and the described electromagnetic valve components of described control valve spring pad are installed at the bottom of the hole of lower opening and are contacted, and the through hole of control valve spring pad aligns with described first the suitable for reading of middle oil duct; The first gap is left between the hole wall that the outer circumferential face of described spring seat and described electromagnetic valve components install lower opening;

Secondly, some control valve seat locating columns are inserted in the lower positioning hole at the bottom of the hole of described second electromagnetic valve components installation intermediate hole, then described control valve seat is placed in described second electromagnetic valve components to install in intermediate hole and to position described control valve seat in the upper positioning hole making described control valve seat locating column be inserted on described control valve seat bottom surface, the bottom surface of described control valve seat and described second electromagnetic valve components are installed to seal at the bottom of the hole of intermediate hole contact and the entrance in the oil-feed passageway in control valve seat is alignd with the outlet of described oil input channel, the outlet in the fuel-displaced passageway in control valve seat is alignd with described second the suitable for reading of middle oil duct, make the oil return center hole of described control valve seat and described solenoid valve that lower opening is installed to align simultaneously, leave the second gap between the face, hole simultaneously making the second external cylindrical surface of described control valve seat and described second electromagnetic valve components install intermediate hole, described second gap is communicated with the oil-return groove of described control valve seat bottom surface,

Then the axial taper partially passing through described control valve seat below the sealing guide section of described control spool controlled valve opening and be inserted in the axis control valve opening of described control valve seat, lower cylindrical section and the described axial control valve hole of described control spool form closely spaced couple and coordinate; The lower cylindrical section bottom surface of described control spool contacts with described spring seat end face; Conical seal (contact) face in the upper conical section of described control spool has at least a part to be the top that the axial taper being positioned at described control valve seat controls the conical seal (contact) face of valve opening; Form a M shape high-voltage oil cavity between the face, hole that axis in part conic sealing surface in the upper conical section of described control spool, the conical seal (contact) face of lower conical section and described control valve seat controls valve opening, described M shape high-voltage oil cavity is communicated with the oil-feed passageway in described control valve seat;

Then described valve seat is placed in described second electromagnetic valve components to install in intermediate hole and the first external cylindrical surface making the control valve seat mounting hole of described valve seat be enclosed within described control valve seat positions simultaneously, the entrance in the fuel-displaced passageway in described control valve seat is communicated with the through hole of described adjustment pad; Be provided with third space between the face, hole that the outer peripheral surface of described valve seat and described second electromagnetic valve components install intermediate hole, described third space is communicated with described second gap on the one hand, and another aspect is communicated with the entrance of described second back oil road; Ensure that the conical seal (contact) face of the axial taper valve opening of described valve seat has at least a part to be positioned at above the conical seal (contact) face of the sealing guide section of described control spool simultaneously; An adjustment pad is provided with in addition between the hole end face and the end face of described control valve seat of the control valve seat mounting hole of described valve seat,

Then described second electromagnetic valve components that screws into put by described locking screw is installed in the internal thread of intermediate hole upper end, after described locking swivel nut is screwed into position, the annular frustum of described locking swivel nut bottom surface described valve seat, adjustment pad, control valve seat are pressed together and the hole base pressure bottom surface of control valve seat and described second electromagnetic valve components being installed intermediate hole tightly, each self-forming seals;

Then described return spring pad to be placed in the endoporus of described locking swivel nut and the bottom surface of return spring pad is contacted with the end face of described valve seat; Again return spring is enclosed within the second cylindrical portion of armature, then return spring is inserted into together with the second cylindrical portion of armature in the endoporus of described locking swivel nut, now, the bottom surface of return spring contacts with the end face of return spring pad, and the end face of return spring contacts with the bottom surface of the first cylindrical portion of described armature;

Then the 3rd bar section of described armature lever and the 4th bar section are passed the armature rod aperture on described armature, wherein the 4th bar section is also inserted in the axial valve opening of described valve seat through the through hole of return spring pad, and the bottom surface of the 4th bar section is contacted with the end face of described control spool; Armature rod aperture on 3rd bar section of described armature lever and described armature is slidably matched; The bottom surface of the second bar section of described armature lever contacts with the end face of described armature;

Then described electromagnet packing ring is placed on described electromagnetic valve components to install in hole and the bottom surface, hole making its bottom surface and described electromagnetic valve components install hole and contact; Described electromagnet spring and electromagnet compression spring are put into described armature rod aperture, the upper-end surface of described electromagnet spring is against the top, hole of described armature rod aperture, and described electromagnet compression spring should on the lower end surface of described electromagnet spring simultaneously; Then electromagnet is turned around and the annular sleeveless jacket on described electromagnet is inserted into respectively with the upper cylindrical section of lower part and lower cylindrical section electromagnetic valve components installs hole, the first electromagnetic valve components is installed in intermediate hole, simultaneously also make the first bar section of described armature lever, make the first bar section of described armature lever through the endoporus in described electromagnet compression spring in armature rod aperture that the second bar section is inserted on described electromagnet, the bottom surface of described electromagnet compression spring is contacted with the end face of the second bar section of described armature lever; Then the upper outside thread on the internal thread of very tight for electromagnetism cap lower end and described oil injector body to be spun at the upper cylindrical section of electromagnet by very tight for described electromagnetism cap sleeve, after the very tight cap of described electromagnetism is screwed into position, the bore edges in described electromagnetism very tight crown portion hooks on the annular sleeveless jacket of described electromagnet, the upper cylindrical section bottom surface of described electromagnet and the end face close contact of described electromagnet packing ring, make to leave an air gap between the end face of the bottom surface of the lower cylindrical section of described electromagnet and described armature; First bar section of armature lever is inserted in the lower end of described electromagnet spring simultaneously, the end face of the second bar section contacts with the bottom surface of described electromagnet spring, finally in the regulator bolts hole of described electromagnet, one regulator bolts is installed, by the pre-elastic force of regulator bolts regulating magnet spring;

Oil nozzle parts, described oil nozzle parts are arranged on the bottom surface of described oil injector body, and the Sheng oil pocket in these oil nozzle parts is communicated with the middle oil duct of second in described oil injector body.

In a preferred embodiment of the invention, described oil nozzle parts comprise pressure adjusting spring, needle-valve, needle-valve body, nozzle cap nut, push rod, transition block, pressure adjusting spring pad; Through hole is provided with in described pressure adjusting spring pad; Be provided with central ejector rod in described transition block and take up hole, tapered centre hole, center needle-valve jack and transition oil duct, described central ejector rod takes up hole, tapered centre hole, center needle-valve jack from top to bottom coaxially arrange; The end face and bottom surface of described transition block are configured with some upper and lower transition positioning holes; The external frame of described needle-valve body is from top to bottom made up of upper cylindrical section, middle circle shell of column and lower cylindrical section, needle-valve body positioning hole is had in the upper cylindrical section top side configuration of needle-valve body, in needle-valve body center by lower and under be configured with needle-valve positioning hole, contain oil pocket, nozzle opening, needle-valve taper hole and oil nozzle, oil-feed inclined hole is also provided with in addition in needle-valve body, the outlet of described oil-feed inclined hole is communicated with described Sheng oil pocket, and the entrance of oil-feed inclined hole is communicated with the upper cylindrical section end face of described needle-valve body; Described needle-valve is from top to bottom bored bar portion by the first Needle shaft portion, the second Needle shaft portion, the 3rd Needle shaft portion and needle-valve and is formed, the external diameter in the first Needle shaft portion is less than the external diameter in described second Needle shaft portion, the external diameter in the 3rd Needle shaft portion is less than the external diameter in the second Needle shaft portion, and needle-valve cone bar portion is up big and down small; Oil injector body attachment hole, the first needle-valve body mounting hole, the second needle-valve body mounting hole is coaxially disposed with by lower and lower in described nozzle cap nut, the internal diameter of described oil injector body attachment hole is greater than the internal diameter of the first needle-valve body mounting hole, and the internal diameter of the first needle-valve body mounting hole is greater than the internal diameter of the second needle-valve body mounting hole; Described push rod is made up of the first push rod section and the second push rod section, and the first push rod section is positioned at the top of the second push rod section and diameter is less than the diameter of the second push rod section;

During assembling, first described pressure adjusting spring pad and pressure adjusting spring are placed in the oil nozzle member mounting holes of described oil injector body bottom, the end face of described pressure adjusting spring pad contacts with the hole end face of described oil nozzle member mounting holes, the upper end of described pressure adjusting spring contacts with the bottom surface of described pressure adjusting spring pad, the end face of the second push rod section is contacted in the lower end then the first push rod section of described push rod being pressed into described pressure adjusting spring with the bottom end of described pressure adjusting spring;

Then some transition block locating studs are inserted in the end positioning hole on described oil injector body bottom surface, the bottom surface described transition block being arranged on described oil injector body positions described transition block in the upper transition positioning hole making some transition block locating studs be inserted on described transition block end face, the end opening of the second middle oil duct in the oil injector body suitable for reading and described of the transition oil duct of described transition block is alignd, makes the central ejector rod in described transition block take up borehole jack in the second push rod section of described push rod; Again some needle-valve body locating studs are inserted in the lower transition positioning hole on described transition block bottom surface;

Then described needle-valve is inserted into the needle-valve positioning hole of described needle-valve body, contains in oil pocket, nozzle opening, needle-valve taper hole, the end face of described needle-valve body is exposed in the first Needle shaft portion on described needle-valve, it is secondary that described second Needle shaft portion and described needle-valve positioning hole form closely spaced couple, 3rd Needle shaft portion and described nozzle opening Spielpassung, the described needle-valve cone conical seal (contact) face in bar portion and the conical seal (contact) face of described needle-valve taper hole are sealed and matched;

Then the bottom surface end face of the needle-valve body being equipped with needle-valve being arranged on described transition block positions needle-valve body in the needle-valve body positioning hole making described some needle-valve body locating studs be inserted on described needle-valve body end face, with one heart, the entrance of the oil-feed inclined hole in described needle-valve body is alignd with the transition oil duct end opening in described transition block in the center needle-valve jack making the first Needle shaft portion of described needle-valve be inserted into described transition block;

Finally described nozzle cap nut to be from bottom to top enclosed within described needle-valve body and the internal thread of the oil injector body attachment hole upper end of this nozzle cap nut and the lower outside thread of described oil injector body bottom are spun, after nozzle cap nut is screwed into position, the first needle-valve body mounting hole in nozzle cap nut coordinates with the upper cylindrical section of described needle-valve body, contact with the bottom surface of the upper cylindrical section of described needle-valve body at the bottom of the hole of the first needle-valve body mounting hole in nozzle cap nut, the second needle-valve body mounting hole in nozzle cap nut coordinates with the middle circle shell of column of described needle-valve body, by transition block, needle-valve body is tightly arranged on the bottom surface of described oil injector body.

In a preferred embodiment of the invention, the cone angle of the axial taper control valve opening in described control valve seat is greater than the cone angle of the upper conical section in described control spool, the internal diameter axis equaled in described control valve seat that the sealing cone making the sealing cone of the upper conical section in described control spool and the axial taper in described control valve seat control valve opening contacts formed seal band controls the internal diameter of valve opening and is less than the external diameter of described sealing guide section, make described M type high-voltage oil cavity to the axial force of described control spool to make a concerted effort be zero.

In a preferred embodiment of the invention, described oil injector body parts also comprise seal washer, inlet connector, described seal washer, inlet connector is arranged in described inlet connector mounting hole, described seal washer is arranged at the bottom of the hole of described inlet connector mounting hole and between the bottom of described inlet connector, described inlet connector inside is provided with oil inlet hole, the inside of described seal washer is provided with oil-feed through hole, described clearance filter is arranged in the oil inlet hole of described inlet connector, described inlet connector is connected with common rail pipe, from the high pressure fuel in common rail pipe after described clearance filter filters, oil-feed through hole through described return spring pad flows in the oil input channel of described oil injector body, and entered in described M type high-voltage oil cavity by the oil-feed passageway in described oil input channel and described control valve seat.

In a preferred embodiment of the invention, the stroke by regulating the thickness of described adjustment pad to regulate described control spool.

In a preferred embodiment of the invention, by regulating the thickness of described electromagnet packing ring to regulate air gap between described armature and described electromagnet.

In a preferred embodiment of the invention, the cracking pressure by regulating the thickness of described pressure adjusting spring pad to regulate described oil nozzle parts.

Owing to have employed technological scheme as above, the present invention is compared with existing common-rail injector, and tool has the following advantages:

1. common-rail injector of the present invention can realize beginning of injection, fuel injection quantity Flexible Control.The diesel engine applying common-rail injector of the present invention can obtain desirable injection timing by the energising initial point of regulating magnet, can change the every circulating fuel injection quantity of diesel engine by length current"on"time of regulating magnet.

2. the common-rail injector of the present invention's design does not have the Stress control cell structure of other traditional common-rail injectors, fuel-displaced orifices controls ball valve, control piston couple secondary.So without the need to the large meter in hole of processing technology difficulty and fuel-displaced throttle orifice, the difficulty of processing of the common-rail injector of therefore the present invention's design reduces greatly, process costs also corresponding reduction.Control ball valve and control piston couple pair owing to eliminating meter in hole, the recirculating oil quantity of oil sprayer also greatly reduces, so every fuel delivery per cycle also corresponding reduction of common rail system high pressure oil-feeding pump, the working life of common rail system will improve.

3. the electromagnetic valve components of common-rail injector of the present invention is designed to two position three-way valve.This structural design can make Injection Control function more easily realize, and makes fuel injector structure simpler.Compare the common-rail injector that other are traditional, because high-accuracy amount of parts reduces, therefore common-rail injector of the present invention cost reduce, rate of fault decline.

4. after the design of the electromagnetic valve components oil return function of common-rail injector of the present invention can effectively reduce oil sprayer oil-break, needle-valve body contains the residual pressure in oil pocket, and needle-valve is closed more rapid, oil sprayer speed of response improves; Meanwhile, the secondary injection be harmful to can effectively be prevented.

5. the control spool of the electromagnetic valve components of common-rail injector of the present invention is designed to fuel pressure self-balancing type structure, can significantly improve the driving current that oil spout is opened speed of response and reduced electromagnet, effectively raise working life and the reliability of electromagnet.

6. common-rail injector design con-trol spool stroke of the present invention is adjustable structure.The stroke that appropriate design controls spool can optimize oil spout response performance.

7. the oil nozzle modular construction of common-rail injector design of the present invention, can be easier to realize the adjustment to injection pressure of injector.Namely by changing the thickness size of compression spring and the cracking pressure of adjustable oil sprayer.

Accompanying drawing explanation

Fig. 1 is common-rail injector structural representation of the present invention.

Fig. 2 is the enlarged diagram at A place in Fig. 1.

Fig. 3 is the enlarged diagram at B place in Fig. 2.

Fig. 4 is the enlarged diagram at C place in Fig. 3.

Fig. 5 is the enlarged diagram at D place in Fig. 1.

Fig. 6 is the control valve seat bottom surface structure schematic diagram in common-rail injector of the present invention.

Fig. 7 is the V-V place sectional view of Fig. 6.

Embodiment

See Fig. 1 to Fig. 7, a kind of New Common Rail oil sprayer provided in figure, be assembled by oil sprayer parts, electromagnetic valve components and oil nozzle parts, concrete structure is as follows:

Oil injector body parts comprise oil injector body 8, seal washer 21, inlet connector 23, clearance filter 24, oil injector body 8 is provided with outside thread 8e, oil returning pipe joint mounting hole 8a, inlet connector mounting hole 8f and lower outside thread 8g, upper and lower outside thread 8e, 8g are separately positioned on the upper and lower end of oil injector body 8 outer rim, and oil returning pipe joint mounting hole 8a and inlet connector mounting hole 8f is arranged on position, oil injector body upper middle.

Electromagnetic valve components mounting hole is provided with in oil injector body, oil input channel 8b, first back oil road 8h, second back oil road 8i, first middle oil duct 8d, second middle oil duct 8c and oil nozzle member mounting holes 8j, wherein electromagnetic valve components mounting hole is divided into the from top to bottom coaxial electromagnetic valve components arranged to install hole 8k, first electromagnetic valve components installs intermediate hole 8m, second electromagnetic valve components installs intermediate hole 8n and electromagnetic valve components installs lower opening 8p, the internal diameter that electromagnetic valve components installs hole 8k is greater than the internal diameter that the first electromagnetic valve components installs intermediate hole 8m, the internal diameter that first electromagnetic valve components installs intermediate hole 8m is greater than the internal diameter that the second electromagnetic valve components installs intermediate hole 8n, the internal diameter that second electromagnetic valve components installs intermediate hole 8n is greater than the internal diameter 8p that electromagnetic valve components installs lower opening,

The upper end of installing intermediate hole 8n in the second electromagnetic valve components is provided with one section of internal thread 8q.

The entrance of oil input channel 8b is communicated with at the bottom of the hole of inlet connector mounting hole 8f, and outlet is installed at the bottom of the hole of intermediate hole 8n with the second electromagnetic valve components and is communicated with.

The axis being parallel of the first back oil road 8h and electromagnetic valve components mounting hole is arranged, install in electromagnetic valve components at the bottom of the hole of hole 8k and be configured with radial oil-return groove 8r, the entrance of the first back oil road 8h is communicated with oil-return groove 8r, and outlet is communicated with the neutral position of the second back oil road 8i; The hole wall that entrance and second electromagnetic valve components of the second back oil road 8i install intermediate hole 8n is communicated with, and the outlet of the second back oil road is communicated with at the bottom of the hole of inlet connector mounting hole 8a.

First middle oil duct 8d, the second middle oil duct 8c be arranged in parallel, wherein the first middle oil duct 8d and electromagnetic valve components install lower opening 8p, oil nozzle member mounting holes 8j coaxially arranges and is interconnected, and the internal diameter of the first middle oil duct 8d is less than electromagnetic valve components and installs the internal diameter of lower opening 8p and the internal diameter of oil nozzle member mounting holes 8j.

Suitable for reading and second electromagnetic valve components of the second middle oil duct 8c is installed at the bottom of the hole of intermediate hole 8n and is communicated with, and end opening is communicated with the bottom surface of oil injector body 8.

Install in the second electromagnetic valve components at the bottom of the hole of intermediate hole 8n and be configured with two lower positioning hole (not shown)s; The bottom surface of oil injector body 8 is configured with positioning hole (not shown) of some ends.

Seal washer 21, inlet connector 23 is arranged in inlet connector mounting hole 8f, seal washer 21 is arranged at the bottom of the hole of inlet connector mounting hole 8f and between the bottom of inlet connector 23, inlet connector 23 inside is provided with oil inlet hole 23a, oil-feed through hole 21a is provided with in the inside of seal washer 21, clearance filter 24 is arranged in the oil inlet hole 23a of inlet connector 23, inlet connector 23 is connected with common rail oil pipe (not shown), after high pressure fuel in common rail oil pipe is filtered by clearance filter 24, flow in oil input channel 8b through the oil-feed through hole 21a of seal washer 21.

Electromagnetic valve components comprises electromagnet 1, electromagnet compression spring 2, armature lever 3, armature 4, locking swivel nut 5, valve seat 6, adjustment pad 7, control valve spring 9, control valve spring pad 10, spring seat 18, control valve seat 19, controls spool 20, return spring pad 22, return spring 25, electromagnet packing ring 26, O RunddichtringO 27, the very tight cap 28 of electromagnetism and electromagnet spring 29.

The external frame of electromagnet 1 is made up of the upper cylindrical section 1a coaxially arranged and lower cylindrical section 1b, the external diameter wherein going up cylindrical section 1a be greater than lower cylindrical section 1b external diameter and the internal diameter that the external diameter of upper cylindrical section 1a and electromagnetic valve components install hole 8k to carry out sealing adaptive, upper cylindrical section 1a is provided with an annular sleeveless jacket 1c, in electromagnet 1, is coaxially arranged with armature rod aperture 1d and regulator bolts hole 1e from the bottom to the top.

Armature lever 3 from top to bottom by different-diameter and coaxial the first bar section 3a, the second bar section 3b, the 3rd bar section 3c and the 4th bar section 3d arranged form, the wherein largest diameter of the second bar section 3b, the diameter of the first bar section 3a and the 3rd bar section 3c is all less than the diameter of the second bar section 3b, and the diameter of the 4th bar section 3d is less than the diameter of the 3rd bar section 3c.

The external frame of armature 4 is from top to bottom made up of the flange part 4a coaxially arranged, the first cylindrical portion 4b and the second cylindrical portion 4c, the external diameter of flange part 4a is greater than the external diameter of the first cylindrical portion 4b, the external diameter of the first cylindrical portion 4b is greater than the external diameter of the second cylindrical portion 4c, the bottom surface of flange part 4a is the face of being inclined upwardly, and has armature rod aperture 4d in the center configuration of armature.

The excircle of locking swivel nut 5 is provided with outside thread 5a, is provided with endoporus 5b in locking swivel nut 5, and locking swivel nut 5 bottom surface is provided with annular frustum 5c wide at the top and narrow at the bottom.

Axial valve opening 6a, axial taper valve opening 6b, control valve seat mounting hole 6c in valve seat 6, be provided with radial valve opening 6d is from top to bottom coaxially disposed with in valve seat 6, the inner of radial valve opening 6d is communicated with the hole wall of axial valve opening 6a, the outer end of this radial valve opening 6d is communicated with the periphery wall of valve seat 6, the internal diameter of axial valve opening 6a is less than the internal diameter of control valve seat mounting hole 6c, axial taper valve opening 6b is up-small and down-big, its small end inner diameter equals the internal diameter of axial valve opening 6a, and large end internal diameter is less than the internal diameter of control valve seat mounting hole 6c.

Control valve seat 19 outer circumferential face is made up of the first external cylindrical surface 19c coaxially arranged and the second external cylindrical surface 19d, and the first external cylindrical surface 19c is positioned at the top of the second external cylindrical surface 19d and the diameter of the first external cylindrical surface 19c is less than the diameter of the second external cylindrical surface 19d.From top to bottom be disposed with axial taper to control valve opening 19e at the center of control valve seat 19, axially control valve opening 19f and oil return center hole 19g.It is up big and down small cone shape hole that axial taper controls valve opening 19e, the large end internal diameter that axial taper controls valve opening 19e equals the large end internal diameter of axial taper valve opening 6b, the small end inner diameter that axial taper controls valve opening 19e equals the internal diameter axially controlling valve opening 19f, and the internal diameter of oil return center hole 19g is greater than the internal diameter axially controlling valve opening 19f.

In control valve seat 19, be also provided with oil-feed passageway 19a and fuel-displaced passageway 19b, wherein the entrance of oil-feed passageway 19a is communicated with the bottom surface of control valve seat 19, exports and is communicated with the face, hole axially controlling valve opening 19f.

The entrance of fuel-displaced passageway 19b is communicated with the end face of control valve seat 19, and outlet is communicated with the end face of control valve seat 19.Be configured with two upper positioning hole 19hs identical with lower positioning hole (not shown) position in the bottom surface of control valve seat 19 and be configured with four oil-return groove 19i be interconnected, these oil-return grooves 19i is communicated with oil return center hole 19g and is communicated with the second external cylindrical surface d of control valve seat 19 simultaneously.

Control the external frame of spool 20 from top to bottom successively by upper cylindrical section 20a, sealing guide section 20b, upper conical section 20c, lower conical section 20d, lower cylindrical section 20e forms, the external diameter wherein going up cylindrical section 20a is less than the external diameter of sealing guide section 20b, upper conical section 20c is up big and down small conical section, lower conical section 20d is up-small and down-big conical end, on this, the Outside diameter of conical section 20c equals the diameter sealing guide section 20b, on this, the end diameter of conical section 20c equals the end diameter of lower conical section 20d, the Outside diameter of lower conical section 20d equals the diameter of lower cylindrical section 20e, the end face periphery of sealing guide section 20b is provided with conical seal (contact) face 20b '.

Control valve spring pad 10, return spring pad 22, adjustment pad 7 all offer through hole 10a, 22a, 7a.

During assembling, first spring seat 18, control valve spring pad 10, control valve spring 9 are placed in electromagnetic valve components successively and install in lower opening 8p, wherein control valve spring 9 is between spring seat 18, control valve spring pad 10, bottom surface and the electromagnetic valve components of control valve spring pad 10 are installed at the bottom of the hole of lower opening 8p and are contacted, and the through hole 10a of control valve spring pad 10 aligns with the first middle the suitable for reading of oil duct 8d; Gap a is left between the hole wall that the outer circumferential face of spring seat 18 and electromagnetic valve components install lower opening 8p.

Secondly, two control valve seat locating column (not shown)s are inserted in the lower positioning hole (not shown) at the bottom of the hole of the second electromagnetic valve components installation intermediate hole 8n, then control valve seat 19 is placed in the second electromagnetic valve components to install in intermediate hole 8n and to position control valve seat 19 in the upper positioning hole 19h making two control valve seat locating column (not shown)s be inserted on control valve seat 19 bottom surface, the bottom surface of control valve seat 19 and the second electromagnetic valve components are installed to seal at the bottom of the hole of intermediate hole 8n contact and the entrance of the oil-feed passageway 19a in control valve seat 19 is alignd with the outlet of oil input channel 8b, the outlet of the fuel-displaced passageway 19b in control valve seat 19 is alignd with the second middle the suitable for reading of oil duct 8c, make the oil return center hole 19g of control valve seat 19, with solenoid valve, lower opening 8p is installed to align simultaneously, leave gap b between the face, hole simultaneously making the second external cylindrical surface 19d of control valve seat 19 and the second electromagnetic valve components install intermediate hole 8n, gap b is communicated with the oil-return groove 19i of control valve seat 19 bottom surface.

Then the axial taper controlling sealing below the guide section 20b of spool 20 and partially pass through control valve seat 19 is controlled valve opening 19e and the axis that is inserted into control valve seat 19 controls in valve opening 19f, the lower cylindrical section 20e controlling spool 20 forms closely spaced couple coordinate with the axial valve opening 19f that controls.

The lower cylindrical section 20e bottom surface controlling spool 20 contacts with spring seat 18 end face; The conical seal (contact) face controlled on the upper conical section 20c of spool 20 has at least a part to be the top that the axial taper being positioned at control valve seat 19 controls the conical seal (contact) face of valve opening 19e; Form a M shape high-voltage oil cavity M between the face, hole that the axis controlled in the part conic sealing surface in the upper conical section 20c of spool 20, the conical seal (contact) face of lower conical section 20d and control valve seat 19 controls valve opening 19f, M shape high-voltage oil cavity M is communicated with the oil-feed passageway 19a in control valve seat 19.

Then valve seat 6 is placed in the second electromagnetic valve components to install in intermediate hole 8n and to make the control valve seat mounting hole 6c of valve seat 6 be enclosed within the first external cylindrical surface 19c of control valve seat 19 upper and position simultaneously, the entrance of the fuel-displaced passageway 19b in control valve seat 19 is communicated with the through hole 7a adjusting pad 7; Be provided with gap c between the face, hole that the outer peripheral surface of valve seat 6 and the second electromagnetic valve components install intermediate hole 8n, gap c mono-aspect is communicated with gap b, is communicated with on the other hand with the entrance of the second back oil road 8i; Ensure that the conical seal (contact) face of the axial taper valve opening 6b of valve seat 6 has at least a part to be positioned at the conical seal (contact) face 20b ' top of the sealing guide section 20b controlling spool 20 simultaneously; An adjustment pad 7 is provided with in addition between the hole end face and the end face of control valve seat 19 of the control valve seat mounting hole 6c of valve seat 6.

Then the outside thread 5a on locking swivel nut 5 being screwed into the second electromagnetic valve components installs in the internal thread 8q of intermediate hole 8n upper end, after locking swivel nut 5 is screwed into position, the annular frustum 5c of locking swivel nut 5 bottom surface valve seat 6, adjustment pad 7, control valve seat 19 are pressed together and the hole base pressure bottom surface of control valve seat 19 and the second electromagnetic valve components being installed intermediate hole 8n tightly, each self-forming seals.

Then return spring pad 22 is placed on locking swivel nut 5 endoporus 5b in and the bottom surface of return spring pad 22 is contacted with the end face of valve seat 6; Again return spring 25 is enclosed within the second cylindrical portion 4c of armature 4, then return spring 25 is inserted into together with the second cylindrical portion 4c of armature 4 in the endoporus 5b of locking swivel nut 5, now, the bottom surface of return spring 25 contacts with the end face of return spring pad 22, and the end face of return spring 25 contacts with the bottom surface of the first cylindrical portion 4b of armature 4.

Then the 3rd bar section 3c of armature lever 3 and the 4th bar section 3d is passed the armature rod aperture 4d on armature 4, wherein the 4th bar section 3d is also inserted in the axial valve opening 6a of valve seat 6 through the through hole 22a of return spring pad 22, and the bottom surface of the 4th bar section 3d is contacted with the end face controlling spool 20; Armature rod aperture 4d on 3rd bar section 3c of armature lever 3 and armature 4 is slidably matched; The bottom surface of the second bar section 3b of armature lever 3 contacts with the end face of armature 4.

Then electromagnet packing ring 26 is placed on electromagnetic valve components to install in the 8k of hole and the bottom surface, hole making its bottom surface and electromagnetic valve components install hole 8k and contact; Electromagnet spring 29 and electromagnet compression spring 2 being put in armature rod aperture 1d simultaneously and the upper end of electromagnet spring 29 is contacted with the hole end face of armature rod aperture 1d, the lower end of electromagnet spring 29 contacts with the end face of electromagnet compression spring 2.

Then electromagnet 1 is turned around and the annular sleeveless jacket 1c on electromagnet 1 is inserted into respectively with the upper cylindrical section 1a of lower part and lower cylindrical section 1b electromagnetic valve components installs hole 8k, the first electromagnetic valve components is installed in intermediate hole 8m, simultaneously also make the first bar section 3a of armature lever 3, make the first bar section 3a of armature lever 3 be inserted in the lower end of electromagnet spring 29 through the through hole 2a of electromagnet compression spring 2 in armature rod aperture 1d that the second bar section 3b is inserted on electromagnet 1 simultaneously, the end face of the second bar section 3b of armature lever 3 is contacted with the bottom surface of electromagnet compression spring 2.

Then very tight for electromagnetism cap 28 is enclosed within the upper cylindrical section 1a of electromagnet 1 and the upper outside thread 8e on the internal thread 28a of very tight for electromagnetism cap 28 lower end and oil injector body 8 is spun, after the very tight cap 28 of electromagnetism is screwed into position, the bore edges 28b at electromagnetism very tight cap 28 top hooks on the annular sleeveless jacket 1c of electromagnet 1, the upper cylindrical section 1a bottom surface of electromagnet 1 and the end face close contact of electromagnet packing ring 26, make to leave an air gap d between the bottom surface of the lower cylindrical section 1b of electromagnet 1 and the end face of armature 4; Finally a regulator bolts (not shown) is installed, by the pre-elastic force of regulator bolts regulating magnet spring 29 at the regulator bolts hole 1e of electromagnet 1.

Oil nozzle parts comprise pressure adjusting spring 11, needle-valve 12, needle-valve body 13, nozzle cap nut 14, push rod 15, transition block 16, pressure adjusting spring pad 17.

Through hole 17a is provided with in pressure adjusting spring pad 17.

Be provided with central ejector rod in transition block 16 and take up hole 16a, tapered centre hole 16b, center needle-valve jack 16c and transition oil duct 16d, central ejector rod takes up hole 16a, tapered centre hole 16b, center needle-valve jack 16c is from top to bottom coaxially arranged; The end face and bottom surface of transition block 16 are configured with some upper and lower transition positioning hole (not shown)s.

The external frame of needle-valve body 13 is from top to bottom made up of upper cylindrical section 13a, middle circle shell of column 13b and lower cylindrical section 13c, needle-valve body positioning hole (not shown) is had in the upper cylindrical section 13a top side configuration of needle-valve body 13, in needle-valve body 13 center by lower and under be configured with needle-valve positioning hole 13d, contain oil pocket 13e, nozzle opening 13f, needle-valve taper hole 13g and oil nozzle 13h, oil-feed inclined hole 13i is also provided with in addition in needle-valve body 13, the outlet of oil-feed inclined hole 13i is communicated with Sheng oil pocket 13e, and the entrance of oil-feed inclined hole 13i is communicated with the upper cylindrical section 13a end face of needle-valve body 13.

Needle-valve 12 is from top to bottom bored bar portion 12d by the first Needle shaft portion 12a, the second Needle shaft portion 12b, the 3rd Needle shaft portion 12c and needle-valve and is formed, the external diameter of the first Needle shaft portion 12a is less than the external diameter of the second Needle shaft portion 12b, the external diameter of the 3rd Needle shaft portion 12c is less than the external diameter of the second Needle shaft portion 12b, and bar portion 12d is up big and down small for needle-valve cone.

Oil injector body attachment hole 14a, the first needle-valve body mounting hole 14b, the second needle-valve body mounting hole 14c is coaxially disposed with by lower and lower in nozzle cap nut 14, the internal diameter of oil injector body attachment hole 14a is greater than the internal diameter of the first needle-valve body mounting hole 14b, and the internal diameter of the first needle-valve body mounting hole 14b is greater than the internal diameter of the second needle-valve body mounting hole 14c.

Push rod 15 is made up of the first push rod section 15a and the second push rod section 15b, and the first push rod section 15a is positioned at the top of the second push rod section 15b and diameter is less than the diameter of the second push rod section 15b.

During assembling, first pressure adjusting spring pad 17 and pressure adjusting spring 11 are placed in the oil nozzle member mounting holes 8j of oil injector body 8 bottom, the end face of pressure adjusting spring pad 17 contacts with the hole end face of oil nozzle member mounting holes 8j, the upper end of pressure adjusting spring 11 contacts with the bottom surface of pressure adjusting spring pad 17, and the through hole 17a of pressure adjusting spring pad 17 aligns with the end opening of the first middle oil duct 8d.Then by push rod 15 first push rod section 15a be pressed into pressure adjusting spring 11 lower end in and the end face of the second push rod section 15b is contacted with the bottom end of pressure adjusting spring 11.

Then some transition block locating stud (not shown)s are inserted in the end positioning hole (not shown) on oil injector body 8 bottom surface, bottom surface transition block 16 being arranged on oil injector body 8 positions transition block 16 in the upper transition positioning hole (not shown) making some transition block locating stud (not shown)s be inserted on transition block 16 end face, the end opening of the second middle oil duct 8c in the suitable for reading and oil injector body 8 of the transition oil duct 16d of transition block 16 is alignd, make the central ejector rod in transition block 16 take up hole 16a is enclosed within the second push rod section 15b of push rod 15 simultaneously, again some needle-valve body locating stud (not shown)s are inserted in the lower transition positioning hole (not shown) on transition block 16 bottom surface.

Then the second Needle shaft portion 12b, the 3rd Needle shaft portion 12c of needle-valve 12 and needle-valve cone bar portion 12d are inserted into the needle-valve positioning hole 13d of needle-valve body 13, contain in oil pocket 13e, nozzle opening 13f, needle-valve taper hole 13g, the first Needle shaft portion 12a on needle-valve 12 exposes the end face of needle-valve body 13, it is secondary that second Needle shaft portion 12 and needle-valve positioning hole 13d form closely spaced couple, 3rd Needle shaft portion 12c and nozzle opening 13f Spielpassung, the needle-valve cone conical seal (contact) face of bar portion 12d and the conical seal (contact) face of needle-valve taper hole 13g are sealed and matched.

Then the bottom surface end face of the needle-valve body 13 being equipped with needle-valve 12 being arranged on transition block 16 positions needle-valve body 13 in the needle-valve body positioning hole (not shown) making described some needle-valve body locating stud (not shown)s be inserted on needle-valve body 13 end face, in the center needle-valve jack 16c making the first Needle shaft portion 12a of needle-valve 12 be inserted into transition block 16 and with one heart, and the entrance of the oil-feed inclined hole 13i in needle-valve body 13 is alignd with the transition oil duct 16d end opening in transition block 16.

Finally nozzle cap nut 14 to be from bottom to top enclosed within needle-valve body 13 and the internal thread 14d of the oil injector body attachment hole 14a upper end of this nozzle cap nut 14 and lower outside thread 8g of oil injector body 8 bottom is spun, after nozzle cap nut 14 is screwed into position, the first needle-valve body mounting hole 14b in nozzle cap nut 14 coordinates with the upper cylindrical section 13a of needle-valve body 13, contact with the bottom surface of the upper cylindrical section 13a of needle-valve body 13 at the bottom of the hole of the first needle-valve body mounting hole 14b in nozzle cap nut 14, the second needle-valve body mounting hole 14c in nozzle cap nut 14 coordinates with the middle circle shell of column 13b of needle-valve body 13, by transition block 16, needle-valve body 13 is tightly arranged on the bottom surface of oil injector body 8.

As shown in Figure 2, electric-controlled fuel injector of the present invention is connected with common rail pipe by inlet connector 23, from the high pressure fuel in common rail pipe after the filtration of clearance filter 24, through the oil input channel 8b of the oil injector body 8 and oil-feed passageway 19a of control valve seat 19 enter controlled valve opening 19f by the axis in the part conic sealing surface controlled in the upper conical section 20c of spool 20, the conical seal (contact) face of lower conical section 20d and control valve seat 19 face, hole between formed in a M shape high-voltage oil cavity M (see Fig. 3).

As shown in Figure 4, the cone angle beta of the axial taper control valve opening 19e in design con-trol valve seat 19 is greater than the cone angle of the upper conical section 20c controlled in spool 20, the internal diameter axis equaled in control valve seat 19 that the sealing cone making the sealing cone of the upper conical section 20c in control spool 20 and the axial taper in control valve seat 19 control valve opening 19e contacts formed seal band k controls the internal diameter of valve opening 19f and is less than the outer diameter D 2 (see Fig. 3) sealing guide section 20b, so in M type high-voltage oil cavity M oil pressure to control spool 20 axial force to make a concerted effort be zero, therefore controlling spool 20 is fuel pressure self-balancing type structures.Just because of control the fuel pressure self-balancing type structural design of spool 20, when oil sprayer is opened, without the need to overcoming the hydraulic action of high pressure fuel when control spool 20 starts, making a concerted effort of each acting force of the spring of Electromagnetic Control valve member only need be overcome.So this design controlling spool 20 can improve oil spout open speed of response, and the requirement to electromagnetic force can be reduced, namely reduce the peak value of solenoid actuated electric current when oil sprayer is opened, improve working life and the reliability of oil sprayer electromagnet.

Suppose that the initial tension of spring of solenoid valve spring 29 is F1.The design method of F1 is as follows:

F1＝F2+F3+IF

In formula:

F2: the initial tension of spring (see Fig. 2) of return spring 25;

F3: the initial tension of spring (see Fig. 2) of control valve spring 9;

IF: solenoid valve spring 29 initial tension of spring exceed value, design IF be greater than zero; The size of IF can affect the speed of response of oil sprayer.IF is larger, and oil spout is opened and postponed to increase, and oil spout is closed and postponed to reduce; IF is less, and oil spout is opened and postponed to reduce, and oil spout is closed and postponed to increase; Therefore, the value of appropriate design IF can optimize the speed of response of common-rail injector of the present invention.

As shown in Figure 4, when electromagnet 1 no electric circuit, the control spool 20 of fuel pressure self-balancing type structure is under the force action of each acting force of the spring of Electromagnetic Control valve member, the sealing cone that the axial taper making the sealing cone of the upper conical section 20c of control spool 20 be close to control valve seat 19 controls valve opening 19e forms seal band k, thus has blocked M type high-voltage oil cavity M and communicate (see Fig. 5) with the Sheng oil pocket 13e in needle-valve body 13.Needle-valve 12 is in closed condition under the initial tension of spring effect of pressure adjusting spring 11 (see Fig. 5), oil sprayer not oil spout.

When electromagnet 1 is energized, electromagnet 1 pair of armature 4 produces electromagnetic force rapidly, design electromagnetic force is greater than Δ F, therefore control spool 20 to move to electromagnet 1 direction, seal band k disappears, M type high-voltage oil cavity M is communicated with the Sheng oil pocket 13e in needle-valve body 13, and high pressure fuel in M type high-voltage oil cavity M fuel-displaced passageway 19b, the second middle oil duct 8c in oil injector body 8 in the through hole 7a, control valve seat 19 of adjustment pad 7, the transition oil duct 16d in transition block 6, oil-feed inclined hole 13i in needle-valve body 13 enter the Sheng oil pocket 13e of needle-valve body 13.Along with from common rail pipe endlessly fuel oil enter the Sheng oil pocket 13e of needle-valve body 13, oil pressure in Sheng oil pocket 13e in needle-valve body 13 can rise rapidly, when the oil pressure of the Sheng oil pocket 13e in needle-valve body 13 be increased to the initial tension of spring that needle-valve 12 can be made to overcome pressure adjusting spring 11 move up time, needle-valve 12 is opened, fuel injection beginning.

When controlling the sealing guide section 20b in spool 20 and moving to the dotted outline position shown in Fig. 4, the conical seal (contact) face 20b ' controlled on the sealing guide section 20b of spool 20 is close to the sealing cone of the axial taper valve opening 6b of valve seat 6, form seal band Q, now, the fuel flow communication area controlling spool 20 reaches maximum, meanwhile, because seal band Q is formed, blocked fuel oil and be back to Engine Fuel Tank by the radial direction oil 6d of valve seat 6, therefore injection rate can rise to maximum very soon.

When electromagnet 1 terminates energising, the electromagnetic force of electromagnet 1 pair of armature 4 rapidly disappears, control spool 20 to move to the direction away from electromagnet 1 under the force action of each acting force of the spring of Electromagnetic Control valve member, the sealing cone that the axial taper making the sealing cone of the upper conical section 20c of control spool 20 be close to control valve seat 19 controls valve opening 19e forms seal band k, thus has blocked M type high-voltage oil cavity M and communicate with the Sheng oil pocket 13e in needle-valve body 13, meanwhile, seal band Q disappears, the Sheng oil pocket 13a of needle-valve body 13 is by the oil-feed inclined hole 13i in needle-valve body 13, transition oil duct 16d in transition block 6, in oil injector body 8 second middle oil duct 8c, fuel-displaced passageway 19b in control valve seat 19, the through hole 7a of adjustment pad 7, the axial taper valve opening 6b of valve seat 6, axial valve opening 6a, radial direction oil 6d, gap c, gap b, second back oil road 8i is communicated with oil returning pipe joint mounting hole 8a, (see Fig. 2), therefore the oil pressure in the Sheng oil pocket 13a in needle-valve body 13 declines rapidly, when oil pressure drop to the active force of oil pressure to needle-valve 12 be less than the initial tension of spring of pressure adjusting spring 11 time, needle-valve 12 moves down, when the sealing cone of the needle-valve cone bar portion 12d that needle-valve 12 moves in needle-valve 12 touches the sealing cone of needle-valve taper hole 13g of needle-valve body 13, needle-valve is closed, end of injection.

From above-mentioned oil sprayer working principle, electromagnetic valve components of the present invention adopts the design of two-position three-way electromagnetic control valve oil return function can effectively reduce the residual pressure of the Sheng oil pocket 13a after electromagnet 1 power-off in needle-valve body 13, needle-valve is closed rapider, injection delay shortens, and oil sprayer speed of response improves.Meanwhile, the secondary injection be harmful to can effectively be prevented.

As shown in Figure 1, control spool 20 and be closely spaced couple pair with control valve seat 19, needle-valve 12 with needle-valve body 13, during oil sprayer work, high pressure fuel can be entered in the first middle oil duct 8d of oil injector body 8 by a small amount of seepage in gap between this two places couple pair.Continue to raise to prevent the fuel pressure in the first middle oil duct 8d, the present invention designs 4 oil-return groove 19i with head it off at the lower surface of control valve seat 19, and the fuel oil in the first middle oil duct 8d is flowed in oil returning pipe joint mounting hole 8a by 4 oil-return groove 19i, gap c, gap b, the second back oil road 8i.The length of 4 oil-return groove 19i is Y, and width is X, is highly Z.

As shown in Fig. 3 and Fig. 2, the thickness size L2 changing adjustment pad 7 can adjust the stroke S controlling spool 20.S is larger, and oil return circulation area and high pressure oil-feed circulation area all increase, and is conducive to the hydraulic response speed improving oil sprayer, but can reduces the mechanical response speed controlling spool 20.Therefore the stroke S of appropriate design control spool 20 can optimize the oil spout response performance of common-rail injector of the present invention.

As shown in Figure 2, the thickness size L1 changing electromagnet packing ring 26 can adjust the height T of the air gap d of armature 4.

As shown in Figure 5, the thickness size L3 changing pressure adjusting spring pad 17 can change the pretightening force of pressure adjusting spring 11, thus changes the cracking pressure of needle-valve.

The motor applying common-rail injector of the present invention can obtain desirable injection timing by the energising initial point of regulating magnet 1, can change per engine cycle fuel injection quantity by length current"on"time of regulating magnet 1.

More than show and describe basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain has appending claims and equivalent thereof to define.

Claims

1. a New Common Rail oil sprayer, is characterized in that, comprising:

2. New Common Rail oil sprayer as claimed in claim 1, it is characterized in that, described oil nozzle parts comprise pressure adjusting spring, needle-valve, needle-valve body, nozzle cap nut, push rod, transition block, pressure adjusting spring pad; Through hole is provided with in described pressure adjusting spring pad; Be provided with central ejector rod in described transition block and take up hole, tapered centre hole, center needle-valve jack and transition oil duct, described central ejector rod takes up hole, tapered centre hole, center needle-valve jack from top to bottom coaxially arrange; The end face and bottom surface of described transition block are configured with some upper and lower transition positioning holes; The external frame of described needle-valve body is from top to bottom made up of upper cylindrical section, middle circle shell of column and lower cylindrical section, needle-valve body positioning hole is had in the upper cylindrical section top side configuration of needle-valve body, in needle-valve body center by lower and under be configured with needle-valve positioning hole, contain oil pocket, nozzle opening, needle-valve taper hole and oil nozzle, oil-feed inclined hole is also provided with in addition in needle-valve body, the outlet of described oil-feed inclined hole is communicated with described Sheng oil pocket, and the entrance of oil-feed inclined hole is communicated with the upper cylindrical section end face of described needle-valve body; Described needle-valve is from top to bottom bored bar portion by the first Needle shaft portion, the second Needle shaft portion, the 3rd Needle shaft portion and needle-valve and is formed, the external diameter in the first Needle shaft portion is less than the external diameter in described second Needle shaft portion, the external diameter in the 3rd Needle shaft portion is less than the external diameter in the second Needle shaft portion, and needle-valve cone bar portion is up big and down small; Oil injector body attachment hole, the first needle-valve body mounting hole, the second needle-valve body mounting hole is coaxially disposed with by lower and lower in described nozzle cap nut, the internal diameter of described oil injector body attachment hole is greater than the internal diameter of the first needle-valve body mounting hole, and the internal diameter of the first needle-valve body mounting hole is greater than the internal diameter of the second needle-valve body mounting hole; Described push rod is made up of the first push rod section and the second push rod section, and the first push rod section is positioned at the top of the second push rod section and diameter is less than the diameter of the second push rod section;

3. New Common Rail oil sprayer as claimed in claim 2, it is characterized in that, the cone angle of the axial taper control valve opening in described control valve seat is greater than the cone angle of the upper conical section in described control spool, the internal diameter axis equaled in described control valve seat that the sealing cone making the sealing cone of the upper conical section in described control spool and the axial taper in described control valve seat control valve opening contacts formed seal band controls the internal diameter of valve opening and is less than the external diameter of described sealing guide section, make described M type high-voltage oil cavity to the axial force of described control spool to make a concerted effort be zero.

4. New Common Rail oil sprayer as claimed in claim 3, it is characterized in that, described oil injector body parts also comprise seal washer, inlet connector, described seal washer, inlet connector is arranged in described inlet connector mounting hole, described seal washer is arranged at the bottom of the hole of described inlet connector mounting hole and between the bottom of described inlet connector, described inlet connector inside is provided with oil inlet hole, the inside of described seal washer is provided with oil-feed through hole, described clearance filter is arranged in the oil inlet hole of described inlet connector, described inlet connector is connected with common rail pipe, from the high pressure fuel in common rail pipe after described clearance filter filters, oil-feed through hole through described return spring pad flows in the oil input channel of described oil injector body, and entered in described M type high-voltage oil cavity by the oil-feed passageway in described oil input channel and described control valve seat.

5. New Common Rail oil sprayer as claimed in claim 4, is characterized in that, by the stroke regulating the thickness of described adjustment pad to regulate described control spool.

6. New Common Rail oil sprayer as claimed in claim 5, is characterized in that, regulates air gap between described armature and described electromagnet by regulating the thickness of described electromagnet packing ring.

7. New Common Rail oil sprayer as claimed in claim 6, is characterized in that, by the cracking pressure regulating the thickness of described pressure adjusting spring pad to regulate described oil nozzle parts.