CN100379976C - Electromagnetic fuel injection valve - Google Patents
Electromagnetic fuel injection valve Download PDFInfo
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- CN100379976C CN100379976C CNB2004800082913A CN200480008291A CN100379976C CN 100379976 C CN100379976 C CN 100379976C CN B2004800082913 A CNB2004800082913 A CN B2004800082913A CN 200480008291 A CN200480008291 A CN 200480008291A CN 100379976 C CN100379976 C CN 100379976C
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- stop element
- adsorption plane
- movable magnetic
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- Fuel-Injection Apparatus (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
In an electromagnetic type fuel injection valve (I), a fixed core (5) is made of ferritic high-hardness magnetic material, while a movable core (12) has fixed therein by a press fit a stop element (14) which comes in direct contact with the fixed core (5) during excitation of a coil (30) with an air gap (g) held between the two cores (5, 12) and which is non-magnetic or less magnetic than the movable core (12). Thus, the two cores can be given high wear resistance and responsiveness without applying a troublesome wear resistance treatment, such as plating, to the fixed and movable cores or without installing a stop plate for the valve body, a fact which can contribute to cost reduction of electromagnetic type fuel injection valves.
Description
Technical field
The present invention relates generally to the electro-magneto fuel injector that is used for the internal-combustion engine supply system, particularly relates to a kind of electro-magneto fuel injector of improvement, and it has: an end has the valve chest of valve seat; Be connected with fixed magnetic core at the valve chest the other end; Be contained in the described valve chest, and the valve body that carries out switch motion with described valve seat cooperation; The movable magnetic core that connects to one and face with this valve body with described fixed magnetic core; Described valve body is given the valve spring of potential energy towards closing the valve direction; And be configured and by the excitation effect movable magnetic core be attracted to fixed magnetic core around described fixed magnetic core, and make described valve body open the coil of valve.
Background technique
Thereby existing electro-magneto fuel injector is the excitation effect by coil directly to be attracted to movable magnetic core fixed magnetic core and to define valve body and open the valve boundary.In this case, when two magnetic cores are attracted each other, can bring very big impact to adsorption plane.Therefore, in order to ensure its wear resistance, and be provided with the electrodeposited coating of Cr, Mo or Ni on these faces, this electro-magneto fuel injector is for example announced by patent documentation 1 and is well-known.And as patent documentation 2 disclosed a kind of electro-magneto fuel injectors, it is for fear of when the coil magnetization, and two magnetic cores contact with each other, and limit the baffle plate that valve body is opened the valve boundary and be provided with on valve chest.
[patent documentation 1] Japanese kokai publication sho 63-125875 communique
[patent documentation 2] TOHKEMY 2002-89400 communique
But, such as patent documentation 1 announcement, to form described such electrodeposited coating in movable magnetic core and fixed magnetic core, just can not lack the electroplating work procedure of needs than the long processing time, and, because thickness of plating layer has difference, so need carry out dimension correction to electrodeposited coating by abrasive machining, thereby man-hour is many, is difficult to reduce the cost of electro-magneto fuel injector.And, disclosed as patent documentation 2, baffle plate is set on valve chest, the increase that causes component number and assemble man-hour, this situation also is unfavorable for reducing cost.
And following patent documentation 3-5 also discloses the technology of relevant electro-magneto fuel injector.
[patent documentation 3] TOHKEMY 2002-4013 communique
[patent documentation 4] Japanese kokai publication sho 59-221456 communique
[patent documentation 5] Japanese kokai publication hei 9-303230 communique
Structure shown in the patent documentation 4 is, is pressed into the ring that is formed by pottery etc. at the position that fixed magnetic core and movable magnetic core are adsorbed mutually, when driving valve, makes from the outstanding ring of movable magnetic core and is connected to the ring that is fixed in fixed magnetic core.Because the installation that needs to encircle fixed magnetic core respectively, fixing, the installation that movable magnetic core is encircled, fixing, and utilize pottery etc. to form required ring, so structure complicated, assembling also is not easy, and is cumbersome.And exist ring from the adjusting in the gap between the adjusting of movable magnetic core overhang, two rings etc., bring the factor of influence more to valve characteristic, the problems such as influence of flow.Because valve body is its joint portion that moves without limits,, close valve characteristic and can produce deviation so aligning is relatively poor.
Patent documentation 5 discloses vertical hole has been set in valve body cylindraceous, and the structure of the cross-drilled hole that is communicated with this vertical hole nearby is set in the valve portion of valve body.Because valve portion is coniform,, closes valve characteristic and can produce deviation so aligning is relatively poor.
Summary of the invention
The present invention is referred from existing situation and proposes, even its purpose is to provide a kind of wear-resistant processing of two magnetic cores not being carried out the electrodeposited coating etc. of trouble, and the baffle plate of valve body also is not set on valve chest, also can makes valve body have the electro-magneto fuel injector of the cheapness of higher wearability and responsiveness.
And, another object of the present invention is to provide a kind of electro-magneto fuel injector, it constitutes under the as a whole situation at the valve assembly of being made up of valve body and movable magnetic core with identical materials, make this valve assembly have good magnetic property, and, needn't carry out special wear-resistant processing, also have more excellent wearability, can realize the lightweight of valve assembly simultaneously.
In order to reach described purpose, electro-magneto fuel injector of the present invention comprises: an end has the valve chest of valve seat; Be connected with fixed magnetic core at this valve chest the other end; Be housed in the described valve chest and cooperate with valve seat and carry out the valve body of on-off action; Be connected integratedly on this valve body, with the opposed movable magnetic core of described fixed magnetic core, towards closing the valve direction is given potential energy to described valve body valve spring; And, movable magnetic core is attracted to fixed magnetic core by excitation around described fixed magnetic core setting, allow described valve body open the coil of valve.And described fixed magnetic core is made by the high hardness magnetic material (hign hardness ferrite magnetic material) of ferrite system, it the 1st is characterised in that, described movable magnetic core has and the benchmark adsorption plane of described fixed magnetic core subtend and the adsorption plane that constitutes to the side-prominent outstanding adsorption plane of fixed magnetic core one from this benchmark adsorption plane, on described movable magnetic core, be pressed into to be fixed with and be stop element cylindraceous, make its adsorption plane side-prominent to fixed magnetic core one from this movable magnetic core, described stop element is made by the stainless steel that non magnetic or magnetic are weaker than described movable magnetic core, and round described spring, described stop element is when described coil magnetization, on its end face with the adsorption plane butt of described fixed magnetic core, and keep two spaces between the magnetic core, thereby what define described valve body opens the valve boundary, the end face of described stop element for this reason, described benchmark adsorption plane (F) and outstanding adsorption plane (f), in the movable magnetic core that is pressed into stop element (14) (12) afterwards, finish simultaneously through grinding, to guarantee described space.
According to the 1st feature, when coil magnetization,, make valve body keep the predetermined valve boundary of opening by the end face of the stop element that will be provided with integratedly with movable magnetic core and the adsorption plane butt of fixed magnetic core, simultaneously, can between the adsorption plane of two magnetic cores, keep suitable space.Adding stop element is non magnetic or weak magnetic, thus when the coil demagnetization, the residual magnetic between two magnetic cores is rapidly disappeared, thus improve the responsiveness of the pass valve of valve body.
And, by the end face of stop element and the adsorption plane of movable magnetic core are carried out grinding simultaneously, to guarantee the space, thereby, be fixed in the movable magnetic core irrelevantly with stop element is pressed into, can accurately obtain, when coil magnetization, make the space of the formed two magnetic core adsorption planes of adsorption plane butt of the end face of stop element and fixed magnetic core, and, also can accurately obtain the gap between stop element and the movable magnetic core, improved the responsiveness that valve body is driven valve.
The 2nd of the present invention is characterised in that, on the basis of the 1st feature, described fixed magnetic core is made of alloy, this alloy contains: Cr is that 10～20wt%, Si are that at least one side among 0.1wt%, Al and the Ni is for more than or equal to 1wt%, other compositions are that ferrite is Fe, Mn, C, P, S, and Al and Ni to add up to content be 1.15～6wt%.
According to the 2nd feature, only need that the above-mentioned alloy of processing just can access the hardness height, wearability is good and the magnetic flux density height, can bring into play than the fixed magnetic core of magnetic force greatly, also can improve the responsiveness of valve body widely.
The of the present invention the 3rd is characterised in that, on the basis of the 1st feature, described stop element is pressed in the chimeric recess that forms on the movable magnetic core adsorption plane, so that the part of stop element is outstanding from this adsorption plane, on the periphery that is pressed into the side top of this stop element, form thinner conical surface or the arc surface in top.
According to the 3rd feature, the material of stop element and movable magnetic core and valve body are irrelevant, can freely select nonmagnetic substance for use.And stop element can be fixed on the movable magnetic core simply by being pressed into.And when being pressed into, because the conical surface or the arc surface of stop element top periphery can successfully be directed on the inner peripheral surface of chimeric recess, so can prevent the generation of smear metal.Further, by management to the size of stop element overhang, can be accurate and easily obtain described space.
The present invention the 4th is characterised in that, on the basis of the 1st feature, described stop element and described valve body is formed as one, and is provided with so that this stop element connects movable magnetic core.
According to the 4th feature, irrelevant with movable magnetic core, can utilize the material of non magnetic or weak magnetic to constitute valve body and stop element, the residual magnetic in the time of can making the coil demagnetization promptly disappears, and improves the durability of valve body and stop element simultaneously.
Electro-magneto fuel injector of the present invention comprises: valve chest, its by an end have the cylindric valve base part of valve seat, the magnetic cylindrical body that rearward extends coaxially from the rearward end of this valve base part and the non-magnetic cylinder body that is incorporated into this magnetic cylindrical body rearward end coaxially constitute; Fixed magnetic core, it is connected with the other end at this valve chest; Valve body, it is housed in the described valve chest, and has the valve portion and the valve stem that is connected with this valve portion that cooperates with valve seat; Movable magnetic core, it is connected with on described valve stem, and mutually opposed with fixed magnetic core; Valve spring, it gives potential energy towards closing the valve direction to described valve body; And coil, it is attracted to fixed magnetic core by excitation with described movable magnetic core round described fixed magnetic core setting, thereby makes described valve body drive valve.Constitute described valve body and the movable magnetic core that includes described valve stem integratedly with same material, be used as valve assembly.It the 5th is characterised in that, constitute described valve portion integratedly by identical ferrite series high hardness magnetic material, described valve stem and described movable magnetic core, and on described movable magnetic core, fixedly be stop element cylindraceous and form valve assembly by being pressed into, described stop element is made by the stainless steel that non magnetic or magnetic are weaker than described movable magnetic core, and round described spring, and it is side-prominent to fixed magnetic core one from the adsorption plane of described movable magnetic core, form described valve seat coniform, on the other hand, form the described valve portion that is landed on this valve seat hemispherical, forming the vertical hole that begins from the end face of described stop element till the sphere centre that surpasses described hemispherical valve portion on the described valve assembly, and will indulge hole and the interior cross-drilled hole that is communicated with of described valve chest, be used as fuel passage, the joint portion that nearby formed of the sphere centre of the described valve portion on described valve stem, this joint portion is supported on the inner peripheral surface of described valve chest slidably, make described cross-drilled hole be opened in described joint portion near, and than the more close valve seat of sphere centre of described hemispherical valve portion.
According to the 5th feature, by the high hardness magnetic material of identical ferrite system constitute valve body, valve stem and movable magnetic core integratedly and obtain valve assembly can bring into play good magnetic property and higher wearability, make fuel injection characteristic keep stable chronically.And,,, add and reduced the component number of packages, thereby reduce cost so can cut down man-hour because this valve assembly does not need special wear-resistant processing.
Further, owing to valve seat is formed coniform, the valve portion that will be landed on the other hand on this valve seat forms hemispherical, nearby form the joint portion that is supported on slidably on the valve chest inner peripheral surface in the sphere centre of valve portion, so switching stable posture of valve, and can guarantee the aligning of valve body, also improve and closed valve characteristic.
And, because valve assembly forms from the stop element end face and begins to surpassing the vertical hole till the described hemispherical valve portion and making the cross-drilled hole that is communicated with in this vertical hole and the described valve chest, be used as fuel passage, therefore eliminated excess stock (surplus material) significantly, thereby, can make its lightweight significantly, improve responsiveness, can realize to high level the long term stabilization of spray characteristic magnetic force.
And, offer on the outer circumferential face between joint portion and the hemispherical valve portion by making the cross-drilled hole that is communicated with vertical hole in the valve assembly than the valve stem of the more close valve seat of sphere centre of this valve portion, and can make the valve assembly lightweight, and improve its responsiveness, can adapt to the strong request of injection valve miniaturization, and, easily joint portion is lubricated, even, also can easily get rid of, also carry out the cooling of valve assembly easily just in case there is bubble to sneak into.
The of the present invention the 6th is characterised in that, on the basis of the 5th feature, described valve assembly is made of alloy, this alloy contains: Cr is that 10～20wt%, Si are that at least one side among 0.1wt%, Al and the Ni is for more than or equal to 1wt%, other compositions are that ferrite is Fe, Mn, C, P, S, and the total amount of Al and Ni is 1.15～6wt%.
According to the 6th feature, only need the above-mentioned alloy of processing, just can access high hardness, wear resistance is good, and the magnetic flux density height, can bring into play the high performance valve assembly of bigger magnetic force.
The present invention the 7th is characterised in that, on the basis of the 5th feature, also is provided with the cross-drilled hole to the outer circumferential face opening of described movable magnetic core.
According to the 7th feature, with fuel from vertical hole by this cross-drilled hole be directed to movable magnetic core around, realize its lubricated and cooling, and, will be rejected to vertical hole side by cross-drilled hole at the bubble of this generation, thereby can prevent that bubble from moving to valve seat.
Above-mentioned and other purposes of the present invention, feature and advantage, by the reference accompanying drawing in following detailed description of preferred embodiments of carrying out, can be clearer and more definite.
Description of drawings
Fig. 1 is the longitudinal sectional drawing of the 1st embodiment's of the present invention internal-combustion engine with electro-magneto fuel injector.
Fig. 2 is the enlarged view of part 2 among Fig. 1.
Fig. 3 is the stereogram of the valve assembly among Fig. 1.
Fig. 4 is expression the present invention the 2nd embodiment, the sectional drawing corresponding with Fig. 2.
Fig. 5 is the expression fixed magnetic core with the plotted curve of the relation of the total amount of Al in the alloy and Ni and hardness.
Fig. 6 is the expression fixed magnetic core with the plotted curve that concerns between the total amount of Al in the alloy and Ni and magnetic flux density and the volume resistivity (volume resistivity).
Embodiment
Followingly embodiments of the present invention are described with reference to accompanying drawing, the 1st embodiment according to the present invention.
Followingly the preferred embodiments of the present invention are described with reference to accompanying drawing.
At first, the 1st embodiment of the present invention who represents from Fig. 1～Fig. 3 begins to describe.
In Fig. 1, internal-combustion engine has with the valve chest 2 of electro-magneto fuel injector 1: front end has the cylindric valve base part 3 of valve seat 8; Be incorporated into the magnetic cylindrical body 4 of these valve base part 3 rearward end coaxially; And the non-magnetic cylinder body 6 that is incorporated into these magnetic cylindrical body 4 rear ends coaxially.
Valve base part 3 has the 3a of connecting cylinder portion in rearward end, and the 3a of this connecting cylinder portion stretches out from the ring-type shoulder 3b magnetropism cylindrical body 4 of valve base part 3 peripheries.By the 3a of this connecting cylinder portion being pressed into the front end inner peripheral surface of magnetic cylindrical body 4, make the front end of magnetic cylindrical body 4 abut to ring-type shoulder 3b, and with valve base part 3 and magnetic cylindrical body 4 mutually coaxially and liquid thickly (liquid-tight) combine.Make the end face of the facing butt joint of magnetic cylindrical body 4 and non-magnetic cylinder body 6, and by along full Zhou Jinhang laser beam welding, make they mutually coaxially and liquid thickly combine.
Valve base part 3 comprises: at the valve opening 7 of its front-end face opening; Be connected the coniform valve base 8 of valve opening 7 inboards; And the cylindrical shape pilot hole 9 that is connected the large-diameter portion of valve seat 8.Liquid has thickly welded to whole circumference the jet tray (injectorplate) 10 of steel plate system on the front-end face of valve base part 3, and this jet tray 10 has a plurality of fuel orifices 11 that are communicated with described valve opening 7.
Inner peripheral surface at non-magnetic cylinder body 6, from the close property of its rear end liquid be pressed into the fixed magnetic core 5 of hollow cylindrical and be fixed, this moment, non-magnetic cylinder body 6 front end left not the part with fixed magnetic core 5 tablings, accommodated valve assembly V from this part to valve base part in 3 the valve chest 2.
As Fig. 1, shown in Figure 3, valve assembly V is made of valve body 18 and movable magnetic core 12.Described valve body 18 opens and closes the hemispherical valve portion 16 of valve opening 7 and supports this valve portion 16 by cooperating with described valve seat 8 valve stem 17 constitutes.Described movable magnetic core 12 is connected with valve stem 17, crosses over non-magnetic cylinder bodies 6 from magnetic cylindrical body 4, and is inserted among them mutually opposed coaxially with fixed magnetic core 5.It is littler than pilot hole 9 that valve stem 17 forms diameter, and a pair of joint (journal) 17a of portion, 17a before and after forming on its periphery, and the 17a of this joint portion, 17a are outstanding to its radius outside, and are supported on slidably on pilot hole 9 inner peripheral surfaces.At this moment, two 17a of joint portion, 17a are arranged to make both spaced apart as best one can on axle direction.
Be provided with on the valve assembly V: begin vertical hole 19 till the sphere centre O that surpasses hemispherical valve portion 16 from the ear end face of movable magnetic core 12; A plurality of the 1st cross-drilled hole 20a that this vertical hole 19 is communicated with movable magnetic core 12 outer circumferential faces; A plurality of the 2nd cross-drilled hole 20b that this vertical hole 19 is communicated with valve stem 17 outer circumferential faces between two 17a of joint portion, the 17a; And with respect to the 17a of joint portion of front side near valve portion 16 places, a plurality of the 3rd cross-drilled hole 20c that this vertical hole 19 is communicated with the periphery of valve stem 17.At this moment, the 3rd cross-drilled hole 20c preferably is arranged on the position more forward with respect to the sphere centre O of valve portion 16, and the 17a of joint portion of front side preferably is arranged on the position of the as far as possible close 16 sphere centre O of valve portion.
Be formed with spring seat 24 midway in vertical hole 19 towards the ring-type of fixed magnetic core 5 one sides.
Fixed magnetic core 5 has the vertical hole 21 that is communicated with the vertical hole 19 of movable magnetic core 12, and fuel inlet tube 26 is connected with integratedly in the rear end of fixed magnetic core 5, and the inside of this fuel inlet tube 26 is communicated with vertical hole 21.Fuel inlet tube 26 is made of with the wide diameter part 26b that links to each other with this narrow footpath 26a of portion the narrow footpath 26a of portion that links to each other with fixed magnetic core 5 rear ends.The retainer 23 of tubulose inserts or gently is pressed into vertical hole 21 from this narrow footpath 26a of portion.Compression is provided with movable magnetic core 12 is closed the valve spring 22 that valve one side is given potential energy to valve body 18 between this retainer 23 and described spring seat 24.At this moment, be fitted to the assumed load amount that the degree of depth of indulging hole 21 is adjusted valve spring 22 by retainer 23, after this adjust to finish, make the peripheral wall portions ground of the narrow footpath 26a of portion (the か ぁ Ru/crimped), retainer 23 is fixed on the narrow footpath 26a of portion thus of crispaturaing to the inside.Fuel filter 27 is housed in the wide diameter part 26b.
Described fixed magnetic core 5 and valve assembly V are made by ferrite series high hardness magnetic material, specifically constitute by the alloy that cuts following composition.
Cr……10～20Wt％
Si……0.1Wt％
Al and Ni ... both all comprise, and wherein at least one side's amount is more than or equal to 1Wt%, and both to add up to amount be 1.15～6wt%
Other compositions ... ferrite is Fe, the Mn as impurity, C, P, S
And in described alloy, particularly contain Al and Ni and add up to one of 1.15～6wt%, bigger relation is arranged with the raising of wearability, magnetic and the responsiveness of fixed magnetic core 5 and valve assembly V.Promptly, Al and Ni add up to about 95% of containing ratio (total content) to become sludge, its hardness for fixed magnetic core 5, valve assembly, magnetic flux density and volume resistivity have considerable influence.From obtaining the wearability aspect, hardness is the bigger the better; From increasing the magnetic force aspect, magnetic flux density is the bigger the better; From improving responsiveness, volume resistivity is the smaller the better.
According to Al and the total containing ratio of Ni and relation hardness between of experimental investigation in described alloy, obtained the result shown in the plotted curve of Fig. 5, and, obtain the result shown in the plotted curve of Fig. 6 according to the total containing ratio of Al and Ni in the experimental investigation alloy and the relation between magnetic flux density and the volume resistivity.
Can find out clearly that from Fig. 5 as long as the total containing ratio of Al and Ni reaches 1.15～6wt%, then hardness of alloy is 200～400Hmv.The hardness of this scope even after the alloy cutting, wear-resistant processing such as does not electroplate, and can make fixed magnetic core 5 and valve assembly V have sufficient wearability yet.Thereby,, can cut down man-hour, so can reduce the cost of fixed magnetic core 5 and valve assembly V owing to do not need special wear-resistant processing.
From Fig. 6, can find out clearly, if the total containing ratio of Al and Ni surpasses 6wt%, the magnetic flux density of fixed magnetic core 5 and valve assembly will descend, not only can not keep sufficient magnetic force, and because the volume resistivity reduction, flowing of magnetic flux also can be slack-off, and the responsiveness of fixed magnetic core 5 and valve assembly V also can descend thereupon.
Therefore, be set at 1.15～6wt%, can make wearability, magnetic, the responsiveness of fixed magnetic core 5 and valve assembly V satisfy practical application by total containing ratio with Al and Ni.
In addition, containing Cr in the described alloy of existing magnetic core usually is that 10～20Wt%, Si are 0.1Wt%, and it is Fe, impurity Mn, C, P, S that other compositions have ferrite.
As shown in Figure 2, in the movable magnetic core 12 of valve assembly, with adsorption plane 12a that the adsorption plane 5a of fixed magnetic core 5 faces mutually on formed chimeric recess 13, in this chimeric recess 13, be pressed into, perhaps be pressed into the back and be fixed by welding or riveted joint round the stop element 14 of the collar shape of spring 22.When being pressed into, form thinner conical surface 14a or the arc surface in top on the periphery of side top being pressed into of stop element 14.Stop element 14 is made of nonmagnetic substance, for example JIS SUS304 material.
Described stop element 14 is outstanding outside the adsorption plane 12a of movable magnetic core 12, opens the gap S of Valve travel to be equivalent to valve body 18 usually, and is mutually opposed with the adsorption plane 5a of fixed magnetic core 5.
Movable magnetic core 12 is made of benchmark adsorption plane F and outstanding adsorption plane f, and described benchmark adsorption plane F faces with predetermined space and fixed magnetic core 5 during with fixed magnetic core 5 butts mutually at stop element 14.Described outstanding adsorption plane f is side-prominent to fixed magnetic core 5 one from this benchmark adsorption plane F.
Described predetermined space g is set to, and when coil 30 during from the excited state demagnetization, the relict flux amount between fixed magnetic core 5 and the movable magnetic core 12 is rapidly disappeared.On the other hand, though outstanding adsorption plane f when the overhang of benchmark adsorption plane F is set at stop element 14 with fixed magnetic core 5 butts, give prominence to adsorption plane f also not with scope that the adsorption plane of fixed magnetic core 5 contacts in.But this moment, in order to make the disappearance of the outstanding residual magnetic of not overslaugh of adsorption plane f, the area of outstanding adsorption plane f is configured to littler than the area of benchmark adsorption plane F.In illustrated embodiment, outstanding adsorption plane f forms ring-type, so that it is around stop element 14, forms benchmark adsorption plane F in its periphery.
The end face of described stop element 14 and benchmark adsorption plane F, outstanding adsorption plane f are after stop element 14 is installed to movable magnetic core 12, finish simultaneously by grinding.Can accurately obtain the described gap s and the space g that are relative to each other thus.
Return Fig. 1, on the periphery of valve shell 2, corresponding to fixed magnetic core 5 and movable magnetic core 12, the nested coil assembly 28 of having installed.Coil 30 on this bobbin 29 constitutes this coil assembly 28 by bobbin 29 and spooling.This bobbin 29 is nested in their periphery via whole non-magnetic cylinder body 6 from magnetic cylindrical body 4 rear ends.Front end round the solenoid housing 31 of this coil assembly 28 is welded on the outer circumferential face of magnetic cylindrical body 4.Its rear end is welded on from the rearward end periphery of fixed magnetic core 5 and protrudes on the outer circumferential face of flange shape yoke 5b.Solenoid housing 31 forms cylindric, and, at one side formation slit 31a vertically.
The front half part of described solenoid housing 31, coil assembly 28, fixed magnetic core 5 and fuel inlet tube 26, the plastic nappe 32 that is formed by injection moulding covers.At this moment, in solenoid housing 31, fill nappe 32 by slit 31a.And, be provided with the connector (coupler) 34 of accommodating the splicing ear 33 that links to each other with coil 30 integratedly at the intermediate portion of nappe 32.
Below the 1st embodiment's effect is described.
Under the state that makes coil 30 demagnetizations, utilize the elastic force of valve spring 22 that valve assembly V is forwards pushed, and the hemispherical valve portion 16 of valve body 18 is landed on the cone shape valve seat 8, therefore pass through the aligning effect (Tone heart effect of valve portion 16), can always keep the good valve state that closes, make the petrolift of from figure, not representing be pumped into the fuel of fuel inlet tube 26, flow through retainer 23 inside of tubulose, the vertical hole 19 and the 1st of valve assembly V～the 3rd cross-drilled hole 20a～20c, be kept in the valve base part 3 ready (readiness), and the 17a of joint portion that supplies to valve body 18, be lubricated around the 17a.
If coil 30 is carried out excitation with energising, then consequent magnetic flux, successively by fixed magnetic core 5, solenoid housing 31, magnetic cylindrical body 4 and movable magnetic core 12, by this magnetic force, the assumed load amount of the movable magnetic core 12 opposing valve springs 22 of valve assembly V attracted to fixed magnetic core 5, valve body 18 breaks away from valve seat 8, therefore valve opening 7 is opened, the fuel under high pressure in the valve base part 3 flows out from valve opening 7, sprays to engine intake valve from fuel jet orifice 11.
This moment is by abutting to the stop element 14 on the nested movable magnetic core 12 that is fixed on valve assembly V on the adsorption plane 5a of fixed magnetic core 5, thus define valve body 18 open the valve boundary.The adsorption plane 12a of movable magnetic core 12 relies on space g to face mutually with the adsorption plane 5a of fixed magnetic core 5, can avoid contacting with the direct of fixed magnetic core 5, particularly by stop element 14 from the management of the size of the overhang of the adsorption plane 12a of movable magnetic core 12, can not only accurately but also easily obtain described space g.And it is non magnetic adding stop element 14, and the residual magnetic between two magnetic cores 5,12 when coil 30 demagnetizations promptly disappears, and can improve the response valve that closes of valve body 18.Described stop element 14 since with movable magnetic core 12 be that split constitutes, so irrelevant with movable magnetic core 12 and valve body 18, can freely select nonmagnetic substance.
And, stop element 14 can be fixed on the movable magnetic core 12 by being pressed into simply, and when being pressed into,, produce so can prevent smear metal because the conical surface 14a or the arc surface of the tip portion periphery of stop element 14 can successfully be directed on the inner peripheral surface of chimeric recess 13.
On the other hand, because fixed magnetic core 5 and valve assembly V are made by the high hardness magnetic material that described ferrite is, so the movable magnetic core 12 of fixed magnetic core 5 and valve assembly V can be brought into play good magnetic property, concerted action can improve the response valve of opening of valve body 18.And, even fixed magnetic core 5 is subjected to the repeated stock of stop element 14, also can bring into play advantages of good abrasion, thereby can correctly keep the Valve travel of opening of valve body 18 chronically.Valve portion 16 in the valve body 18 of valve assembly V and the 17a of joint portion further, 17a with respect to the butt or the slip of valve seat 8 or pilot hole 9, also can bring into play advantages of good abrasion, can make the action of valve body 18 keep stable chronically.
And, the fixed magnetic core 5 and the valve assembly V that make for ferrite series high hardness magnetic material needn't carry out special Wear-resistant Treatment, in the time of can cutting down worker, and, because stop element 14 is provided with integratedly with movable magnetic core 12, can not increase the component number of packages and assemble man-hour, so can reduce cost.
Valve assembly V will indulge hole 19 and make vertical hole 19 and valve chest 2 interior the 1st～the 3rd cross-drilled hole 20a～20c that the are communicated with path setting that acts as a fuel.Wherein vertical hole 19 is that the end face from movable magnetic core 12 begins till the valve portion 16.Particularly, because vertical hole 19 surpasses the sphere centre O of hemispherical valve portion 16, extend to position near its top end always, so by this fuel passage excess stock of cutback valve assemblying body V significantly, consequently, make valve assembly V lightweight, can improve its responsiveness magnetic force.
And, described the 1st cross-drilled hole 20a with fuel from vertical hole 19 be directed to movable magnetic core 12 around, not only can be lubricated and cool off it, can also can prevent effectively that bubble from moving to valve seat 8 getting rid of (divert) to vertical hole 19 sides in the bubble guiding of this generation.
And, the the 2nd and the 3rd cross-drilled hole 20b, 20c with fuel from vertical hole 19 be directed to valve body 18 around, particularly be directed to the 17a of joint portion, around the 17a, not only can help them to be lubricated and cool off, the bubble guiding in this generation can also be rejected to vertical hole 19 sides, can prevent effectively that bubble from moving to valve seat 8.
And, because the adsorption plane 12a of movable magnetic core 12 is made of the outstanding adsorption plane f and the large-area benchmark adsorption plane F of small size.So, at the 30 excitation initial stages of coil, even the magnetic flux that produces is few, because this flux concentration is passed through the outstanding adsorption plane f of small size, thus can improve the magnetic flux density of outstanding adsorption plane f, thus the responsiveness of movable magnetic core 12 improved.And, owing to should outstanding adsorption plane f be positioned at the center portion of movable magnetic core 12, so that the attraction force acts that is produced by magnetic force in the central part of movable magnetic core 12, can make it begin mobile gesture (first Move appearance Potential) is stable.And,,, thereby improve the response valve of opening of valve body 18 because this magnetic flux so can suppress the increase of magnetic resistance, produces bigger attraction force comprehensively by outstanding adsorption plane f and benchmark adsorption plane F in the excitation later stage that produces a large amount of magnetic flux.
Below the 2nd embodiment shown in Figure 4 is described.
In the 2nd embodiment, the valve body 18 of valve assembly V and movable magnetic core 12 are that split constitutes.Stop element 14 cylindraceous and lip part 35 are set on the valve stem 17 of this valve body 18 integratedly, described stop element 14 is through the attachment hole 36 of movable magnetic core 12 and be fixed on the movable magnetic core 12, described lip part 35 docks with the front-end face of movable magnetic core 12, with limit stop element 14 to the chimeric degree of depth of movable magnetic core 12.14 pairs of movable magnetic core 12 of stop element fixing can be with being pressed into or the method for fold (crimping), welding.The valve body 18 of this moment and stop element 14 be the non magnetic or magnetic material more weak than movable magnetic core 12 by cutting, for example the alloy of JISSUS440C and forming.
Because other structures are basic identical with previous embodiment, so, in Fig. 4, give identical reference marks, and omit its explanation the part identical with previous embodiment.
According to the 2nd embodiment, valve body 18 and stop element 14 are irrelevant with movable magnetic core 12, can constitute by material non magnetic with high hardness or weak magnetic, when the coil demagnetization, residual magnetic between two magnetic cores is promptly disappeared, can improve the resistance to persistence of valve body 18 and stop element 14 simultaneously.
The present invention not only is confined to described embodiment, can carry out various design alterations in the scope that does not break away from its aim.For example, can replace the 17a of joint portion of valve stem 17 rear sides, and form joint portion on the outer circumferential face of movable magnetic core 12, this joint portion can be supported on the inner peripheral surface of cylindrical body 4 with being free to slide.
Claims (7)
1. electro-magneto fuel injector, comprising: an end has the valve chest (2) of valve seat (8); Be connected with fixed magnetic core (5) at the other end of this valve chest (2); Be accommodated in the described valve chest (2), and the valve body (18) of cooperating and carrying out on-off action with described valve seat (8); Fuse with this valve body (18), and with the opposed movable magnetic core of fixed magnetic core (5) (12); Towards closing the valve direction is given potential energy to described valve body (18) valve spring (22); And, movable magnetic core (12) is attracted to fixed magnetic core (5) so that described valve body (18) is opened the coil (30) of valve by excitation around described fixed magnetic core (5) setting, and described fixed magnetic core (5) is made by ferrite series high hardness magnetic material, it is characterized in that,
Described movable magnetic core (12) has and the benchmark adsorption plane (F) of described fixed magnetic core (5) subtend and the adsorption plane that constitutes to the side-prominent outstanding adsorption plane (f) of fixed magnetic core (5) from this benchmark adsorption plane (F), on described movable magnetic core (12), be pressed into to be fixed with and be stop element cylindraceous (14), make its adsorption plane (12a) side-prominent to fixed magnetic core (5) from this movable magnetic core (12), described stop element is made by the stainless steel that non magnetic or magnetic are weaker than described movable magnetic core, and round described spring (22), this stop element (14) is when described coil (30) excitation, on its end face with adsorption plane (5a) butt of described fixed magnetic core (5), make two magnetic cores (5,12) adsorption plane (5a, keep space (g) 12a), thereby what limit described valve body (18) opens the valve boundary, the end face of described for this reason stop element (14), described benchmark adsorption plane (F) and outstanding adsorption plane (f), in the movable magnetic core that is pressed into stop element (14) (12) afterwards, finish simultaneously through grinding, to guarantee described space (g).
2. electro-magneto fuel injector according to claim 1, it is characterized in that, described fixed magnetic core (5) is made of alloy, this alloy contains: Cr is that 10～20wt%, Si are that at least one side is more than or equal to 1wt% among 0.1wt%, Al and the Ni, other compositions are that ferrite is Fe, Mn, C, P, S, and to make the total amount of Al and Ni be 1.15～6wt%.
3. electro-magneto fuel injector according to claim 1, it is characterized in that, described stop element (14) is pressed in the last formed chimeric recess (13) of the adsorption plane (12a) of described movable magnetic core (12), so that its part is outstanding from this adsorption plane (12a), on the top periphery that is pressed into side of this stop element (14), form thinner conical surface (14a) or the arc surface in top.
4. electro-magneto fuel injector according to claim 1 is characterized in that, described stop element (14) and described valve body (18) are formed one, is provided with so that this stop element (14) connects described movable magnetic core (12).
5. electro-magneto fuel injector, comprise: valve chest (2), its by an end have the cylindric valve base part (3) of valve seat (8), the magnetic cylindrical body (4) that rearward extends coaxially from the rearward end of this valve base part (3) and the non-magnetic cylinder body (6) that is incorporated into this magnetic cylindrical body (4) rearward end coaxially constitute; Fixed magnetic core (5), it is connected with the other end in this valve chest (2); Valve body (18), it is housed in the described valve chest (2), and has valve portion (16) that cooperates with described valve seat (8) and the valve stem (17) that is connected with this valve portion (16); Movable magnetic core (12), it is connected on the described valve stem (17), and mutually opposed with described fixed magnetic core (5); Valve spring (22) is given potential energy towards closing the valve direction to described valve body (18); And coil (30), it is provided with round described fixed magnetic core (5), by excitation described movable magnetic core (12) is attracted to fixed magnetic core (5), make described valve body (18) drive valve, and make the described valve body (18) and the movable magnetic core (12) that comprise described valve stem (17) integrally formed by same material, constitute valve assembly (V), it is characterized in that
By constituting described valve portion (16) integratedly by identical ferrite series high hardness magnetic material, described valve stem (17) and described movable magnetic core (12), and go up by being pressed in described movable magnetic core (12) and fixedly to be stop element cylindraceous (14) and to form valve assembly (V), described stop element (14) is made by the stainless steel that non magnetic or magnetic are weaker than described movable magnetic core (12), and round described spring (22), and it is side-prominent to fixed magnetic core (5) from the adsorption plane (12a) of described movable magnetic core (12), form described valve seat (8) coniform, on the other hand, the described valve portion (16) that will be landed on this valve seat (8) forms hemispherical, and be used as fuel passage in vertical hole (19) of the last formation of this valve assembly (V) and cross-drilled hole (20c), wherein said vertical hole (19) begins till the sphere centre (O) that surpasses described hemispherical valve body (16) from the end face of described stop element (14), and described cross-drilled hole (20c) makes described vertical hole (19) and described valve chest (2) internal communication; Near the sphere centre (O) of the described valve portion (16) on the described valve stem (17), formed joint portion (17a), this joint portion (17a) is supported on the inner peripheral surface of described valve chest (2) slidably, make described cross-drilled hole (20c) be opened in described joint portion (17a) near, and than the more close valve seat of sphere centre (O) (8) of described hemispherical valve portion (16).
6. electro-magneto fuel injector according to claim 5, it is characterized in that, described valve assembly (V) is made of alloy, contain in this alloy: Cr is that 10～20wt%, Si are that at least one side is for being that ferrite is Fe, Mn, C, P, S more than or equal to 1wt%, other compositions among 0.1wt%, Al and the Ni, and to make Al and Ni add up to amount be 1.15～6wt%.
7. electro-magneto fuel injector according to claim 5 is characterized in that, also is provided with the cross-drilled hole (20a) to the outer circumferential face opening of described movable magnetic core (12).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP079531/2003 | 2003-03-24 | ||
| JP2003079531A JP3887336B2 (en) | 2003-03-24 | 2003-03-24 | Electromagnetic fuel injection valve |
| JP084857/2003 | 2003-03-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1774573A CN1774573A (en) | 2006-05-17 |
| CN100379976C true CN100379976C (en) | 2008-04-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800082913A Expired - Lifetime CN100379976C (en) | 2003-03-24 | 2004-03-19 | Electromagnetic fuel injection valve |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3887336B2 (en) |
| CN (1) | CN100379976C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3819906B2 (en) * | 2004-02-27 | 2006-09-13 | 株式会社ケーヒン | Electromagnetic fuel injection valve and manufacturing method thereof |
| JP4211814B2 (en) * | 2006-07-13 | 2009-01-21 | 株式会社日立製作所 | Electromagnetic fuel injection valve |
| JP4897728B2 (en) * | 2008-03-18 | 2012-03-14 | 株式会社ケーヒン | Electromagnetic fuel injection valve |
| JP4978665B2 (en) * | 2009-06-29 | 2012-07-18 | Ｔｄｋ株式会社 | Metal magnet and motor using the same |
| JP5706168B2 (en) * | 2011-01-14 | 2015-04-22 | 株式会社デンソー | Manufacturing method of solenoid valve |
| JP2013072498A (en) * | 2011-09-28 | 2013-04-22 | Nabtesco Corp | Electromagnetic actuator |
| CN103184959B (en) * | 2011-12-30 | 2017-01-18 | 联合汽车电子有限公司 | Armature-needle valve assembly, and molding assembling method and assembling tool thereof |
| JP6339389B2 (en) * | 2014-03-13 | 2018-06-06 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
| JP6773927B1 (en) * | 2020-01-24 | 2020-10-21 | 株式会社ケーヒン | Electromagnetic fuel injection valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59221456A (en) * | 1983-05-27 | 1984-12-13 | Nippon Denso Co Ltd | Electromagnetic type fuel injection valve |
| US5170987A (en) * | 1989-08-24 | 1992-12-15 | Robert Bosch Gmbh | Electromagnetically actuatable fuel injection valve |
| JPH09303230A (en) * | 1996-05-10 | 1997-11-25 | Keihin Seiki Mfg Co Ltd | Electro magnetic fuel injection valve |
| US20010040194A1 (en) * | 2000-05-12 | 2001-11-15 | Yukio Yamaguchi | Fuel injection valve |
| JP2002004013A (en) * | 2000-06-16 | 2002-01-09 | Keihin Corp | Core for solenoid valve |
| JP2002031009A (en) * | 2000-07-13 | 2002-01-31 | Denso Corp | Fuel injection device |
-
2003
- 2003-03-24 JP JP2003079531A patent/JP3887336B2/en not_active Expired - Lifetime
-
2004
- 2004-03-19 CN CNB2004800082913A patent/CN100379976C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59221456A (en) * | 1983-05-27 | 1984-12-13 | Nippon Denso Co Ltd | Electromagnetic type fuel injection valve |
| US5170987A (en) * | 1989-08-24 | 1992-12-15 | Robert Bosch Gmbh | Electromagnetically actuatable fuel injection valve |
| JPH09303230A (en) * | 1996-05-10 | 1997-11-25 | Keihin Seiki Mfg Co Ltd | Electro magnetic fuel injection valve |
| US20010040194A1 (en) * | 2000-05-12 | 2001-11-15 | Yukio Yamaguchi | Fuel injection valve |
| JP2002004013A (en) * | 2000-06-16 | 2002-01-09 | Keihin Corp | Core for solenoid valve |
| JP2002031009A (en) * | 2000-07-13 | 2002-01-31 | Denso Corp | Fuel injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004285923A (en) | 2004-10-14 |
| CN1774573A (en) | 2006-05-17 |
| JP3887336B2 (en) | 2007-02-28 |
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Effective date of registration: 20220112 Address after: Ibaraki Patentee after: Hitachi astemo Co.,Ltd. Address before: Tokyo Patentee before: KEIHIN Corp. |
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