CN101382110A - Disk spring type high pressure common rail electric-controlled fuel injector - Google Patents
Disk spring type high pressure common rail electric-controlled fuel injector Download PDFInfo
- Publication number
- CN101382110A CN101382110A CNA2008101671915A CN200810167191A CN101382110A CN 101382110 A CN101382110 A CN 101382110A CN A2008101671915 A CNA2008101671915 A CN A2008101671915A CN 200810167191 A CN200810167191 A CN 200810167191A CN 101382110 A CN101382110 A CN 101382110A
- Authority
- CN
- China
- Prior art keywords
- needle
- valve
- oil
- high pressure
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a disk spring type high pressure common rail fuel injector, which comprises a fuel injector body, a high-speed electromagnet, a piston rod, a needle valve component, a two-position two-way switch valve and an intermediate cushion block component, wherein the central slim through hole of the fuel injector body is a stepped round hole, the piston rod is arranged in a small-diameter round hole of the fuel injector body, and the high-speed electromagnet comprises a fixed iron core, a movable iron core and an offsetting spring. The needle valve component is almost the same as a P series needle valve used in an oil injection system of the prior diesel, but adopts the disk spring which is small in axial direction, so that the controlled cavity volume is greatly reduced. Thus the dynamic response and injection properties of the fuel injector are improved and the production succession is good, which contribute to the industrialization. The invention has the advantages of simple structure, greatly reduced high pressure fuel oil, leakage, easily establishment of high pressure in the fuel injector, and realization of high pressure or super high pressure fuel oil injection, and can meet the requirements of the increasingly strict discharge regulations for a diesel.
Description
Affiliated technical field: the present invention is a disk spring type high pressure common rail electric-controlled fuel injector, is applied in the diesel engine high-pressure co-rail electronic control injection system.
Background technique: the common rail electric-controlled injection system of CR series high voltage of German Bosch company is current state-of-the-art diesel electric-controlled injection system, comprising: electric-controlled fuel injector, high-pressure common rail, high pressure oil pump, pressure regulator valve, pressure-limit valve, restrictor, various sensors and ECU (Electrical Control Unit) etc.Parts most crucial, most critical comprise the high speed electromagnetic valve member and high pressure common rail electric control fuel injector is it: moving iron core, field coil, Returnning spring, static iron core, return tube, big nut, Returnning spring, moving iron core guide rod, the big packing ring of adjusting, the guiding pole socket, ditty is put in order packing ring, steel ball.Hydraulic tappet and valve pocket parts comprise: fuel-displaced damping hole, oil-feed damping hole, hydraulic tappet, valve pocket, seal ring.The oil nozzle parts comprise: nozzle spring, attachment post, needle-valve and oil injector body etc.
The function of high-speed electromagnetic valve is to realize the open and close of injector valve, when the solenoid valve dead, because the effect of Returnning spring in the solenoid valve static iron core, steel ball cuts out the fuel-displaced throttle orifice on the valve pocket, at this moment, in the oil injector body in the valve pocket pressure in the pressure accumulation chamber in control chamber and the needle-valve all equal common rail pressure, because the control chamber active area in the valve pocket of hydraulic tappet top is greater than the active area in pressure accumulation chamber in the needle-valve of tappet bottom, the pressure that acts on the control chamber on tappet top closes oil nozzle with nozzle spring power, and oil sprayer is in not oil spout state.
When ECU (Electrical Control Unit) encourages to solenoid valve, because the suction of electromagnet, moving iron core moves upward, steel ball leaves ball seat under the control chamber hydraulic pressure in valve pocket, fuel-displaced throttle orifice by steel ball sealing is opened draining, the control chamber oil liquid pressure drops to certain numerical value, and this numerical value is decided by the flow-rate ratio in fuel-displaced throttle orifice and meter in hole.Act on injector valve bottom from the high pressure oil that is total to rail this moment, injector valve risen open commencement of fuel injection.Fuel injection quantity is decided by unlatching duration (pulsewidth that is decided by ECU (Electrical Control Unit) output), oil nozzle Flow characteristics, injection pressure and the needle lift of oil nozzle.When solenoid valve outage, the moving iron core of solenoid valve moves downward and promotes the steel ball fuel-displaced throttle orifice of sealing of taking a seat under the effect of Returnning spring, and the oil pressure in the control chamber rises, and promotes hydraulic tappet and makes the needle-valve oil nozzle of taking a seat stop oil spout.
High pressure common rail electric control fuel injector will be realized high-pressure injection, and the sealing of each link is most important.Comprising many high pressure static seals and motive sealing.Wherein, valve pocket and oil injector body utilize shoulder hole realization stationary fit in valve pocket cylindrical and the oil injector body, and realize the radial location of valve pocket in oil injector body with this, fit and realize the axially locating of valve pocket in oil injector body in the omoplate face of valve pocket and the hollow plane of oil injector body.But also have a circular groove between valve pocket and the injector body, be full of the ultrahigh pressure fuel oil in this groove.High pressure fuel will pass through a valve pocket damping hole radially when work, promptly the meter in hole enters in the valve pocket, acts on then on the hydraulic tappet, and the control needle-valve is realized oil spout.Fuel oil in this circular groove also can utilize the radial clearance between valve pocket shoulder potassium plane and the oil injector body hollow plane to leak, but also can utilize the minimum cylindrical of valve pocket and the axial clearance between the oil injector body endoporus to leak.If the leakage at this two place can not be controlled effectively, then the superhigh pressure jetting in the high pressure common rail injector is impossible realize.Wherein the radial gap between valve pocket cylindrical shoulder potassium face and the oil injector body hollow plane can reduce the slit by the mature technology of diesel engine tradition injection system, to realize reliable static seal.And the leakage that the axial clearance between valve pocket cylindrical and the oil injector body endoporus forms, Bosch company is a sealed solid circle of having adorned the composite material of a rectangular cross-section in the circular groove between valve pocket and oil injector body endoporus, to realize reliable sealing.
But to realize moving to axial between hydraulic tappet and the valve pocket endoporus,, also be motive sealing or clearance seal herein for being slidingly matched.Motion also to be arranged between needle-valve and the needle-valve body endoporus to axial, realize oil spout, this also be slidingly matched, motive sealing.These positions are owing to be to be slidingly matched, and it certainly exists the gap, and this gap can not be too little, otherwise can't guarantee reliable to-and-fro motion, and too big, and inevitable fuel leakage is serious, can't set up high pressure, can not realize high-pressure injection.Obviously this is the contradiction that can't overcome, and along with the continuous upgrading of diesel emission rules, the Abgasgesetz increasingly stringent, diesel engine must further improve injection pressure, make that so the gap sealed problem at these positions is more outstanding, in fact owing to the gap at these positions, the high pressure common rail injector of this structure will realize that the further raising of injection pressure is very difficult.In addition, the radial clearance between valve pocket shoulder potassium plane and the oil injector body hollow plane is leaked, and the minimum cylindrical of valve pocket and the axial clearance between the oil injector body endoporus are leaked.Although this two place is a static seal,, guarantee that sealing is equally also very difficult reliably along with the further raising of jet pressure.If the leakage at same these positions can not be controlled effectively, then the superhigh pressure jetting in the high pressure common rail injector also is impossible realize.
Purpose of the present invention is exactly to attempt to address these problems the further raising of realization high pressure common rail injector injection pressure, injection characteristics improvement, satisfied constantly harsh Abgasgesetz.Consider from the production inheritance simultaneously, adopt mature technology as far as possible, reduce development cost, reduce the construction cycle, shorten the industrialization cycle.
Summary of the invention:
Purpose of the present invention is exactly the problem that will overcome aforementioned high pressure common rail injector, a kind of novel high-pressure common rail electric-controlled fuel injector of design, its sealability is obviously improved, jet pressure increases substantially, simultaneously can continue to use the cellular type of the p series of standard, microscler oil nozzle, and make the volume of control chamber as far as possible little.
The disk spring type high pressure common rail electric-controlled fuel injector that the present invention proposes, by oil injector body, high-speed electro-magnet, tappet, needle valve assembly, compositions such as middle cushion block assembly.High-speed electro-magnet wherein is a high-speed switch electromagnet.Form by moving iron core, static iron core and Returnning spring.Field coil is arranged in the static iron core.Under the driving of moving iron core at drive circuit of high-speed electro-magnet, during to-and-fro motion, driving a push rod that links together with it moves up and down, and then drive a stepped columniform tappet that is in contact with it and move up and down, and the other end of this tappet contacts with the hemispheroidal sphere of a 2/2-way switch valve of being made up of hemisphere, cone shape hole, cylindrical hole and spring.
When high-speed electro-magnet was switched on, moving iron core was by the static iron core adhesive, and when tappet moved downward under the driving of push rod, tappet promoted hemisphere, away from the inner conical surface of cone shape hole, has promptly realized the unlatching of this switch valve.And when electromagnet cuts off the power supply, when the moving iron core of high-speed electro-magnet resets under the effect of its Returnning spring, push rod lifts, the active force of the end that tappet contacts with push rod is disappeared, and the other end of tappet lifts under the effect of hemisphere Returnning spring, and hemisphere is contacted with the inner conical surface of cone shape hole again, promptly hemisphere is taken a seat, the switch valve closure.
By the present invention, high-speed electro-magnet is installed on the omoplate face of hollow of an oil injector body, and wherein static iron core contact with the hollow omoplate face of oil injector body down, and moves iron core on static iron core.When moving iron core is switched on adhesive by static iron core, move downward.
By the present invention, the switch valve of the 2/2-way of forming by hemisphere, cone shape hole, cylindrical hole and spring, cone shape hole is concentric with cylindrical hole, and a stomidium mouth of the small end aperture of cone shape hole and cylindrical hole links together.The other end aperture of this cylindrical hole contacts with an elongated manhole aperture at oil injector body center.This cylindrical hole i.e. the oil outlet of 2/2-way switch valve for this reason.Tappet is in the slightness hole of the center of oil injector body, and its big end contacts with push rod, the other end, and promptly small end puts in the cylindrical hole and cone shape hole of 2/2-way switch valve, and contacts with hemispheroidal sphere.The big stomidium mouth of cone shape hole and the aperture of another larger-diameter cylindrical hole link together, and the diameter of this cylindrical hole equates with the big stomidium mouth of cone shape hole.And in this great circle cylindrical hole, place a cylindrical helical compression spring, this spring one end withstands on the hemispheroidal plane, the last plane contact of the other end and a cylindrical plane cushion block, hemisphere is contacted with the inner conical surface of cone shape hole reliably, also has a vertical oilhole on this cylindrical plane cushion block, the vertical oilhole that communicates with it by the 3rd cylindrical plane cushion block communicates with control chamber, and this oilhole is the oil inlet hole of switch valve.When tappet acts on active force on the hemisphere sphere when adding active force on hemisphere of high pressure fuel pressure in the oil sprayer greater than the pretightening force of this Returnning spring, hemisphere is just pushed away the inner conical surface of the cone shape hole that is in contact with it, realized the connection of 2/2-way switch valve into and out of the fluid passage, this is the opening state of switch valve.When the disappearance of tappet active force, hemisphere lifts with the inner conical surface of cone shape hole under the effect of Returnning spring power and high pressure fuel pressure and contacts again, and the 2/2-way switch valve is cut off into and out of the fluid passage, and this is the closed condition of switch valve.
By the present invention, the switch valve of the 2/2-way of forming by hemisphere, cone shape hole, cylindrical hole and spring, its inner liquid flow channel for oil, one end is communicated with the slightness hole at oil injector body center, and the spill port that on oil injector body, is communicated with the slightness hole at oil injector body center connection, be communicated with fuel tank at last.The other end is communicated with a control chamber.
By the present invention, control chamber is made up of a cylindrical pit on the lower plane of the cylindrical plane cushion block (this cushion block is the 3rd above-mentioned plane cushion block) of the cylindrical upper-end surface of the maximum diameter of a needle-valve, restriction needle lift.A belleville spring is arranged in this pit.Fluid in the control chamber is communicated with the oil inlet hole of above-mentioned 2/2-way switch valve by a fuel-displaced damping hole, the vertical oilhole on the cushion block of middle transition plane of this cylindrical plane cushion block lower plane pit.Also have simultaneously an oil-feed damping hole in this cylindrical cushion block lower plane pit, this damping hole is communicated with high pressure fuel main oil gallery on the oil injector body by the radial direction oil on the cushion block of middle transition plane.When the 2/2-way switch valve cut out, the high pressure fuel process oil-feed damping hole via the high pressure fuel main oil gallery comes entered control chamber, passes through the oil inlet hole of fuel-displaced damping hole, 2/2-way switch valve then again, enters switch valve.Because this moment, switch valve cut out, promptly hemisphere is taken a seat, and then the mobile of high pressure fuel is cut off, and this rises the oil pressure in the control chamber, promotes needle-valve and takes a seat, and closes the nozzle opening of needle-valve body lower end, finishes oil spout.When the 2/2-way switch valve is opened, high pressure fuel in the control chamber is got back to fuel tank via fuel-displaced damping hole, 2/2-way switch valve, oil injector body center slightness hole, spill port, the oil pressure of control chamber is descended, when this pressure drops to a certain degree, when the oil pressure that the high pressure fuel of needle-valve lower end effect is enough to overcome control chamber acts on the pressure of needle-valve upper end, needle-valve lifts, and the fuel oil of oil holding slot sprays to the firing chamber through nozzle opening on the needle-valve body in the needle-valve body.When oil sprayer is realized oil spout, the oil-feed damping hole that is communicated with control chamber is communicated with high pressure main oil gallery on the oil injector body all the time, therefore injection pressure will descend, enough difference is wanted in the aperture of oil-feed damping hole and fuel-displaced damping hole for this reason, and oil-feed damping hole aperture is enough little, make it form tangible damping, promptly form enough pressure differences, injection pressure is remained unchanged substantially.
By the present invention, needle valve assembly adopts the hole type nozzle of widely used p series in the present diesel engine fuel injection system, and needle valve assembly is made up of needle-valve, needle-valve body, spring etc.But what the present invention adopted is belleville spring, rather than cylindrical helical compression spring.Needle-valve (18) is that the cone of different cylindrical body of three sections diameters of axle and lower end constitutes, the minimum diameter cylndrical surface is topmost, and this minimum diameter cylndrical surface puts in the small end endoporus of belleville spring, the upper-end surface of maximum diameter cylndrical surface is subjected to this belleville spring effect, and the lower end conical surface of needle-valve is fitted on the inner conical surface of needle-valve body lower end tightly.In the columniform pit of sitting up straight the columniform plane cushion block that drops on greatly of belleville spring.Because the axial dimension of belleville spring is little, therefore the control chamber volume of being made up of the cylindrical pit of needle-valve maximum diameter upper-end surface and plane cushion block is very little, and in this control chamber, the minimum diameter cylndrical surface of belleville spring and needle-valve upper end has also occupied a part of space, this makes that the strong cavity volume of control is littler, and high pressure common rail injector is desired just for this.Therefore traditional high pressure common rail injector all adopts cylindrical helical compression spring, and this spring axial dimension is big, makes the strong volume of control not reduce, this makes and realizes at a high speed, continuously, the difficulty relatively of high pressure fuel injection repeatedly.In addition, cylindrical helical compression spring, its spring force and amount of deformation are linear relationship, and the spring force of belleville spring and amount of deformation are not linear relationships, the rigidity that is it changes, can guarantee that like this belleville spring has bigger pre compressed magnitude, needle-valve is produced certain pre-compression force, and needle-valve is when beginning to rise to maximum lift, the increase of spring force is little again, the variation of the pressure difference of needle-valve nozzle opening front and back is controlled in the as far as possible little scope, improves whole spray characteristic, optimize course of injection.
By the present invention, needle-valve is when not oil spout of oil sprayer, the maximum cylindrical of needle-valve body endoporus and needle-valve forms radial clearance, two ends oil liquid pressure is identical up and down for it, there is not fuel leakage, and only when the oil sprayer oil spout, because the control chamber fuel pressure descends, the oil liquid pressure of two ends up and down of this radial clearance is inequality, at this moment just has fuel leakage.
By the present invention, the high-pressure area of whole oil sprayer only is confined on the cylindrical cushion block of needle valve assembly and centre.Originally be present in the fuel leakage in the gap between hydraulic tappet in the BOSCH oil sprayer and the valve pocket endoporus, because in the present invention, without valve pocket, and hydraulic tappet (being the tappet among the present invention) is in and compresses the district, so this leakage does not exist yet.
By the present invention,,, be easy to realize industrialization so the production inheritance is good owing to adopt the p series needle-valve of traditional diesel engine fuel injection system.
Beneficial effect:
The disk spring type high pressure common rail oil sprayer that the present invention proposes, because the high-pressure area only is confined to needle valve assembly and middle cushion block assembly, the difficulty of processing of oil injector body declines to a great extent, the hollow omoplate face of oil injector body upper end only is used for the axially locating of high-speed electro-magnet static iron core, no seal request, and the slightness hole at the center of oil injector body only is the draining passage, tappet does not therebetween have the precision-fit requirement therewith, therefore the machining accuracy of oil injector body is lower, and the machining accuracy of tappet is also lower.Precision machined part mainly is needle valve assembly and cushion block assembly.And cushion block mainly is a plane sealing, and technology comparative maturity, difficulty of processing are also little.The internal leakage of whole oil sprayer significantly reduces, and be easy to form high pressure or superpressure and spray, and the system capacity utilization ratio is improved the system effectiveness raising.Adopt the p series needle-valve of traditional diesel engine fuel injection system in addition, the production inheritance is good, is easy to realize industrialization.Replace cylindrical helical compression spring with belleville spring, can reduce to control strong volume greatly, obviously improve the dynamic response of oil sprayer, and the change stiffness characteristics of belleville spring, can improve injection characteristics, optimize course of injection.
Description of drawings:
Fig. 1 is the structural drawing of disk spring type high pressure common rail oil sprayer
Among the figure: the 1-oil injector body, the 2-static iron core, 3-moves iron core, the 4-Returnning spring, 5-push rod, 6-locking nut, 7-adjusts packing ring, 8-end cap, 9-big nut, the 10-tappet, 11-Returnning spring, 12 cushion blocks (12), 13 cushion blocks (13), 14-cushion block (14), the 15-coil, 16-hemisphere, 17-Returnning spring, the 18-needle-valve, 19-needle-valve body, 20-attaching nut, the 21-belleville spring, W-filler opening, the return opening of H-low-voltage fuel, the vertical oilhole of y1 to y5-, the vertical oil through of y31-, y32-is oil groove radially, y41, the vertical oilhole of y42-, i-oil-feed damping hole, k-control chamber, the fuel-displaced damping hole of o-
Specific embodiments:
Below in conjunction with accompanying drawing the present invention is elaborated:
Concrete structure of the present invention as shown in Figure 1.High-speed electro-magnet is a high-speed switch electromagnet, is made up of static iron core 2, moving iron core 3 and Returnning spring 4.Field coil 15 is arranged in the static iron core.Under the driving of moving iron core 3 at drive circuit of high-speed electro-magnet, during to-and-fro motion, drive the push rod 5 link together with it and move up and down, and then drive tappet 10 and move up and down, so just can make 2/2-way switch valve realization unlatching and the closure formed by hemisphere 16 and Returnning spring 17.
The filler opening w that high pressure fuel is arranged on the oil injector body, the return opening H of low-voltage fuel.The fuel oil that is come by high-pressure common rail enters oil injector body by oil-feed interface W, communicate via axial oilhole y2, y3, y4 on the cushion block 12 of axial elongated oilhole y1 and oil injector body lower end, cushion block 13, the cushion block 14 then, last communicating with the oilhole y5 of needle-valve body 20 enters the interior oil holding slot of needle-valve body.Simultaneously high pressure fuel is affacted the needle-valve upper end via the radial direction oil y32 of cushion block 13, axial oilhole y42 and oil-feed damping hole i on the cushion block 14.Fuel-displaced damping hole on the cushion block 14.Communicate with spring chamber on the cushion block 12 with axial oilhole y41 on the cushion block 14, axial oilhole y31 on the cushion block 13, high pressure fuel is affacted on the hemisphere 16, hemisphere 16 is taken a seat, the draining hole is shut, realize high pressure sealing.Also has a Returnning spring 17 below the hemisphere 16.Cylindrical pit on the upper-end surface of the maximum diameter cylndrical surface of needle-valve 18 and the lower plane of cushion block 14 has formed an airtight space, this is control chamber K, and the contact channel in this control chamber K and the external world is exactly oil-feed damping hole i and the fuel-displaced damping hole o on cushion block 14 lower end surfaces.The fuel pressure of controlling this control chamber just can be realized the fuel injection function of oil sprayer.The minimum diameter cylindrical body that also has a belleville spring 21, needle-valve 18 among the control chamber K.
When the high-speed electro-magnet energising, moving iron core 3 adhesives, drive push rod 5 and move downward, push rod 5 promotes tappet 10 and moves downward, and the 2/2-way switch valve is opened under the effect of tappet 10, at this moment, the high pressure fuel of needle-valve upper-end surface effect passes through spring chamber, hemisphere 16 on the cushion block 12 then through the oilhole y31 on the fuel-displaced damping hole o on the cushion block 14, vertical oilhole y41 and the cushion block 13, again by intermediate elongated through hole, the spill port H of oil injector body, get back to fuel tank, the fuel pressure of needle-valve upper-end surface is descended.Meanwhile, the fuel pressure that acts on the needle-valve 18 lower end conical surfaces but remains unchanged substantially.Because, although have the part high pressure fuel this moment through oil-feed damping hole i, fuel-displaced damping hole on the cushion block 14.Let out away.But because oil-feed damping hole i and fuel-displaced damping hole.Between tangible difference in flow, cause oil-feed damping hole i can form tangible damping, promptly form tangible pressure difference, but the high pressure fuel pressure of guarantee effect on the conical surface of needle-valve lower end is constant so basically, when this fuel pressure is multiplied by the needle-valve lower end conical surface at the axial total oil pressure that area of contour produced of needle-valve during greater than total oil pressure of needle-valve upper-end surface, needle-valve lifts, and the spray orifice of the high pressure fuel process needle-valve body lower end in the needle-valve body is to the engine chamber oil spout.When the electromagnet outage, moving iron core 3 rises under the effect of Returnning spring 11, and drive push rod 5 and lift, the active force of tappet 10 upper ends is disappeared, and tappet 10 is lifted under Returnning spring 17 under the hemisphere 16 of its lower end and oil pressure effect, hemisphere 16 is taken a seat drainback passage is closed simultaneously, the oil pressure of needle-valve 18 upper end control chamber K rises, and when this pressure during greater than the oil pressure on the needle-valve 18 lower end conical surfaces, needle-valve 18 is taken a seat, close the nozzle opening on the needle-valve body 20, end of injection.
Obviously the energising of control high-speed electro-magnet and outage can realize the oil spout of this high pressure common rail injector, the energising of control high-speed electro-magnet can realize the control of injection timing constantly, and length current"on"time of control high-speed electro-magnet can realize the control of oil injection duration.
The high-pressure section of whole oil sprayer only is confined in the following zone of 2/2-way switch valve that hemisphere 16 and Returnning spring 17 form, promptly only in needle valve assembly and cushion block assembly.Having only in these parts has the annular space sealing between the maximum diameter cylndrical surface of needle-valve 18 and needle-valve body 19 endoporus, promptly have one to be slidingly matched, because needle-valve will to-and-fro motion in needle-valve body.But this gap is when not oil spout of oil sprayer, effect oil pressure in two ends is equal up and down for it, therefore can not produce mobile, and only when oil spout, because needle-valve upper end control chamber pressure descends, and needle-valve body 19 lower ends still are high pressure, cause needle-valve body 19 upper and lower end to produce pressure difference, will produce the flow through Gap Flow of this gap of fluid like this, promptly leak.And the oil sprayer of BOSCH, to-and-fro motion gap between needle-valve and the needle-valve body, because the needle-valve upper end communicates all the time with low pressure area, and the lower end communicates all the time with the zone of high pressure, therefore axially there is pressure difference all the time in the radial clearance between needle-valve and the needle-valve body endoporus, therefore certainly exist Gap Flow, oil liquid leakage is arranged in the crack so during this time all the time.In addition, the valve pocket that also has a hydraulic tappet and cooperate with it in the oil sprayer of BOSCH.The valve pocket endoporus cooperates for being slidingly matched with hydraulic tappet, therefore also has the gap.The upper end of this gap is a high pressure fuel, and the lower end is a low-voltage fuel, so also there is pressure difference all the time, this pressure difference causes having Gap Flow all the time in the crack during this time, promptly exist to leak all the time, and no matter oil spout is whether.Though a tappet 10 is also arranged among the present invention, it is at the center of oil injector body slightness hole, and this hole communicates with spill port, is low pressure area therefore, does not have the leakage of high pressure oil.And the present invention do not have valve pocket, therefore do not exist as the static seal between the static seal between BOSCH oil sprayer valve pocket and the oil sprayer endoporus, valve pocket and the oil sprayer hollow omoplate face yet.
The disk spring type high pressure common rail oil spout device structure that the present invention proposes is simple, and part number significantly reduces.Original many clearance seals that exist in the high pressure common rail injector of BOSCH do not exist, therefore the leakage of high pressure fuel significantly reduces, be easy in oil sprayer, set up high pressure, realize high pressure or ultrahigh pressure fuel injection, with the requirement of the diesel emission rules that satisfy increasingly stringent.
Claims (8)
1, a kind of disk spring type high pressure common rail electric-controlled fuel injector, comprise oil injector body (1), high-speed electro-magnet, tappet (10), needle valve assembly, 2/2-way Normally closed type switch valve, middle cushion block assembly etc., it is characterized in that, the center slightness hole of oil injector body (1) is stepped circular hole, tappet (10) is loaded in the minor diameter circular hole of oil injector body, and the minor diameter circular hole had both cooperated with tappet (10) and also has been used for drainback passage, and a Returnning spring (11) is installed in the major diameter circular hole, this upper end, hole is a hollow omoplate face and is used to install the circular hole of electromagnet static iron core (2) that hollow omoplate face is used for electromagnet static iron core axially locating; High-speed electro-magnet comprises static iron core (2), moving iron core (3), Returnning spring (4), and the static iron core center is a manhole, cooperates with the push rod (5) that supports moving iron core (3), and moving iron core (3) is supported on the push rod (5); Tappet (10) is the circular stock of a ladder-type; The inner conical surface of hemisphere (16) and cone shape hole, cylinder-shaped compression spring (17) are formed 2/2-way Normally closed type switch valve; Needle valve assembly is made up of needle-valve (18), needle-valve body (19) and belleville spring (21), and needle-valve (18) is that three sections different cylindrical bodys of the diameter of axle constitute, and the upper end is the minimum diameter cylndrical surface, and the lower end is a conical surface.
2, according to the described high pressure common rail electric control fuel injector of claim 1, it is characterized in that, high-speed electro-magnet is a high-speed switch electromagnet, static iron core (2) is concentric with the center ladder elongated hole of oil injector body (1), a flange is arranged on the push rod (5), be used for moving iron core location, the other end of push rod (5) has a cylindrical body than minor diameter, its end face contacts with the big section of tappet, this cylindrical body cylindrical than minor diameter is installed a cylinder-shaped compression spring (11), be the Returnning spring of moving iron core (3), an end of this spring (11) is placed on the step of shoulder hole of oil injector body (1), and the other end supports push rod (5).
3. according to the described high pressure common rail electric control fuel injector of claim 1, it is characterized in that the big end of tappet (10) contacts with push rod (5), small end contacts with the sphere of the hemisphere (16) of 2/2-way switch valve; Tappet (10) is installed in the center slightness hole of oil injector body (1), need not precision-fit.
4, according to the described high pressure common rail electric control fuel injector of claim 1, it is characterized in that, the sphere of hemisphere (16) and the inner conical surface of cone shape hole are fitted and are formed sealing surface, the end face of cylinder-shaped compression spring (17) and the plane contact of hemisphere (16), the last plane contact of other end and cushion block (12).
5, according to the described high pressure common rail electric control fuel injector of claim 1, it is characterized in that, needle valve assembly is made up of needle-valve (18), needle-valve body (19) and belleville spring (21), needle-valve (18) is that the cone of different cylindrical body of three sections diameters of axle and lower end constitutes, the upper end is the minimum diameter cylindrical body, and the lower end is a cone.
Needle-valve body (19) is a hollow stepped cylindrical body, and maximum diameter endoporus and needle-valve (18) upper end maximum diameter cylindrical body cylindrical cooperates, and is slidingly matched for precision.The upper-end surface of needle-valve body (19) must be close on the lower end surface of cushion block (14), there is the oil holding slot of a spheroid shape at the center of needle-valve body (19), identical with high pressure fuel passage y5 on the one hand, another aspect is through the bigger annular gap between the endoporus of the smaller diameter circle cylinder of needle-valve (18) and needle-valve body (19), and high pressure fuel is affacted on the conical surface of lower end of needle-valve.Needle-valve (18) upper end minimum diameter cylindrical body puts in the endoporus of a belleville spring (21).The big end of this belleville spring (21) acts in the columniform pit of cushion block (14), and small end acts on the upper-end surface of needle-valve maximum diameter, and the small end conical surface with needle-valve (18) is pressed on the conical surface of needle-valve body (19) endoporus bottom like this.
6, according to the described high pressure common rail electric control fuel injector of claim 5, it is characterized in that, the high pressure fuel oil duct of needle-valve body (19), be that vertical oilhole (y5) is to depart from one of the needle-valve body axial centre place processing axial oilhole with needle-valve body axial centre line parallel, this hole communicates with the oil holding slot of the spheroid shape at needle-valve body (19) center.
7, according to the described high pressure common rail electric control fuel injector of claim 5, it is characterized in that, the space of the columniform pit sealing under the cylindrical upper-end surface of maximum diameter of needle-valve (18) and the cushion block (14) on the Transverse plane has constituted control chamber (k), cushion block (14) lower end surface has oil-feed damping hole (i) and fuel-displaced damping hole (o) to communicate with control chamber (k), and the aperture of the oil-feed damping hole (i) that communicates with control chamber (k) is less than the aperture of fuel-displaced damping hole (o).
According to the described high pressure common rail electric control fuel injector of claim 1, it is characterized in that 8, the jet pressure of oil sprayer can reach 180MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101671915A CN101382110A (en) | 2008-10-08 | 2008-10-08 | Disk spring type high pressure common rail electric-controlled fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101671915A CN101382110A (en) | 2008-10-08 | 2008-10-08 | Disk spring type high pressure common rail electric-controlled fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101382110A true CN101382110A (en) | 2009-03-11 |
Family
ID=40462120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101671915A Pending CN101382110A (en) | 2008-10-08 | 2008-10-08 | Disk spring type high pressure common rail electric-controlled fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101382110A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277225A (en) * | 2013-06-07 | 2013-09-04 | 苏州柏德纳科技有限公司 | Oil injection nozzle |
| CN105201716A (en) * | 2015-11-03 | 2015-12-30 | 南岳电控(衡阳)工业技术有限公司 | Novel common-rail fuel injector |
| CN106351775A (en) * | 2016-11-24 | 2017-01-25 | 北京亚新科天纬油泵油嘴股份有限公司 | Control cavity middle-set-type high-pressure electronic control oil injector |
| CN106640458A (en) * | 2016-12-31 | 2017-05-10 | 南岳电控（衡阳）工业技术股份有限公司 | Oil return pressure regulating structure of monoblock pump |
| GB2549479A (en) * | 2016-04-18 | 2017-10-25 | Delphi Int Operations Luxembourg Sarl | Fuel injector |
| CN108412653A (en) * | 2018-03-30 | 2018-08-17 | 中国重汽集团重庆燃油喷射系统有限公司 | A kind of common-rail injector |
| CN113790116A (en) * | 2021-09-14 | 2021-12-14 | 哈尔滨工程大学 | Electric control high-pressure common rail oil injector capable of realizing variable oil injection rule |
| CN114109682A (en) * | 2021-11-02 | 2022-03-01 | 上海中船三井造船柴油机有限公司 | Multifunctional oil sprayer of marine dual-fuel host |
| CN114790957A (en) * | 2022-04-29 | 2022-07-26 | 中国北方发动机研究所(天津) | Slide valve type common rail oil sprayer |
| CN114922758A (en) * | 2022-06-01 | 2022-08-19 | 一汽解放汽车有限公司 | Electronic pressure limiting valve and diesel engine electric control common rail system |
| CN116857096A (en) * | 2023-09-04 | 2023-10-10 | 哈尔滨工程大学 | Low-oil-return electric-control oil injector with variable oil injection rule |
-
2008
- 2008-10-08 CN CNA2008101671915A patent/CN101382110A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277225A (en) * | 2013-06-07 | 2013-09-04 | 苏州柏德纳科技有限公司 | Oil injection nozzle |
| CN105201716A (en) * | 2015-11-03 | 2015-12-30 | 南岳电控(衡阳)工业技术有限公司 | Novel common-rail fuel injector |
| CN105201716B (en) * | 2015-11-03 | 2017-11-03 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of common-rail injector |
| GB2549479A (en) * | 2016-04-18 | 2017-10-25 | Delphi Int Operations Luxembourg Sarl | Fuel injector |
| CN106351775B (en) * | 2016-11-24 | 2019-11-12 | 北油电控燃油喷射系统(天津)有限公司 | A kind of control chamber middle high-pressure electric control fuel injector |
| CN106351775A (en) * | 2016-11-24 | 2017-01-25 | 北京亚新科天纬油泵油嘴股份有限公司 | Control cavity middle-set-type high-pressure electronic control oil injector |
| CN106640458B (en) * | 2016-12-31 | 2023-02-28 | 南岳电控（衡阳）工业技术股份有限公司 | Oil return pressure adjusting structure of monoblock pump |
| CN106640458A (en) * | 2016-12-31 | 2017-05-10 | 南岳电控（衡阳）工业技术股份有限公司 | Oil return pressure regulating structure of monoblock pump |
| CN108412653A (en) * | 2018-03-30 | 2018-08-17 | 中国重汽集团重庆燃油喷射系统有限公司 | A kind of common-rail injector |
| CN108412653B (en) * | 2018-03-30 | 2023-11-03 | 重油高科电控燃油喷射系统(重庆)有限公司 | Common rail fuel injector |
| CN113790116A (en) * | 2021-09-14 | 2021-12-14 | 哈尔滨工程大学 | Electric control high-pressure common rail oil injector capable of realizing variable oil injection rule |
| CN114109682A (en) * | 2021-11-02 | 2022-03-01 | 上海中船三井造船柴油机有限公司 | Multifunctional oil sprayer of marine dual-fuel host |
| CN114109682B (en) * | 2021-11-02 | 2024-02-02 | 上海中船三井造船柴油机有限公司 | Multifunctional fuel injector of marine dual-fuel host |
| CN114790957A (en) * | 2022-04-29 | 2022-07-26 | 中国北方发动机研究所(天津) | Slide valve type common rail oil sprayer |
| CN114790957B (en) * | 2022-04-29 | 2023-11-21 | 中国北方发动机研究所(天津) | Slide valve type common rail fuel injector |
| CN114922758A (en) * | 2022-06-01 | 2022-08-19 | 一汽解放汽车有限公司 | Electronic pressure limiting valve and diesel engine electric control common rail system |
| CN116857096A (en) * | 2023-09-04 | 2023-10-10 | 哈尔滨工程大学 | Low-oil-return electric-control oil injector with variable oil injection rule |
| CN116857096B (en) * | 2023-09-04 | 2023-11-24 | 哈尔滨工程大学 | Low-oil-return electric-control oil injector with variable oil injection rule |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101382110A (en) | Disk spring type high pressure common rail electric-controlled fuel injector | |
| CN101251068B (en) | Valve core type high pressure co-rail electric-controlled oil ejector | |
| CN101338716B (en) | High pressure co-rail electric control fuel injector | |
| CN104018966B (en) | Pressure accumulation current-limiting type electromagnetic control oil sprayer | |
| CN101680413B (en) | Control valve for a fuel injection valve | |
| CN104018964B (en) | Pressure accumulation current-limiting type piezoelectric control fuel injector | |
| CN101251067B (en) | Tappet rod type high pressure co-rail electric-controlled oil ejector | |
| CN102213166B (en) | High-pressure common-rail electronic control oil injector | |
| CN105332826B (en) | No leakage electromagnetic control type fuel gas ejecting device | |
| EP2134954A2 (en) | Fuel injection control device for internal combustion engine and method of controlling fuel injection for internal combustion engine | |
| CN102213165A (en) | High pressure common rail electronic control fuel injector | |
| CN101228347B (en) | Fuel injection device for an internal combustion engine using direct fuel injection | |
| CN104196665A (en) | High-pressure common rail oil sprayer | |
| CN203892092U (en) | Pressure accumulating and flow limiting electromagnetic control oil atomizer | |
| CN111120171A (en) | Fuel injection valve assembly | |
| CN100412353C (en) | High pressure common rail electric control fuel injector sealing device | |
| CN105351115A (en) | Non-leakage piezoelectric control gas injection device | |
| CN203925839U (en) | Pressure accumulation current-limiting type piezoelectric control fuel injector | |
| CN212318196U (en) | Control valve sleeve with quick switching function | |
| CN213063810U (en) | Electric control common rail oil injector with dynamic leakage flow control | |
| CN208534664U (en) | Medium and heavy-duty engines monomer crosspointer valve twin-jet nozzle high pressure common rail injector | |
| CN202946280U (en) | Common-rail fuel injector pressure balance type internal sealed plane control valve | |
| CN206352543U (en) | A kind of two-way oil-feed bypass type electric-controlled fuel injector with ditch | |
| CN116044631B (en) | Electric control common rail fuel injector for reducing pressure fluctuation based on multistage resistance-capacitance buffering | |
| CN116085159B (en) | Common rail fuel injector capable of realizing stable injection based on multistage self-pressure regulation dissipation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI YUNFEI AUTOMATION EQUIPMENT CO., LTD. Free format text: FORMER OWNER: BEIJING HUAWEIQI FUEL INJECTION TECHNOLOGY CO., LTD. Effective date: 20110907 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Shangyong Inventor after: Chen Huiliang Inventor before: Wang Chengqi Inventor before: Huang Zhenyu |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WANG CHENGQI HUANG ZHENYU TO: WANG SHANGYONG CHEN HUILIANG Free format text: CORRECT: ADDRESS; FROM: 100084 HAIDIAN, BEIJING TO: 200072 ZHABEI, SHANGHAI |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20110907 Address after: 200072 No. 750, Lane 3, Luochuan Middle Road, Shanghai, Zhabei District Applicant after: Shanghai Yunfei Automation Equipment Co., Ltd. Address before: 100084 room 6, building 1, No. 603, Nongda South Road, Beijing, Haidian District Applicant before: Beijing Huaweiqi Fuel Injection Technology Co., Ltd. |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090311 |