CN100427750C - Fuel injector valve and producing method thereof - Google Patents
Fuel injector valve and producing method thereof Download PDFInfo
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- CN100427750C CN100427750C CNB2005100965301A CN200510096530A CN100427750C CN 100427750 C CN100427750 C CN 100427750C CN B2005100965301 A CNB2005100965301 A CN B2005100965301A CN 200510096530 A CN200510096530 A CN 200510096530A CN 100427750 C CN100427750 C CN 100427750C
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Abstract
A fuel injection valve(10) has a cylinder component (11), a combination movable core (33) and a valve needle (24), a fixed core (40) and a spring (39). The cylinder components is provided with a fuel channel (26) to allow the fuel to flow from an inhalation port (15) to a spraying port (23). The movable part (33) can be slidingly installed on the cylinder component. The fixed core (40) generates a magnetic force to attract up the movable part to open the fuel channel (26). The fixed core has a main part (41) pressed into and coping with the cylinder component (11), and a joint part (42) outstanding from the main part (41). The spring (39) is inserted between the movable core (33) and the joint part (42) to promote the valv needle (24) to close off the fuel channel (26). The restoration force of the spring (26) is regulated by the deformation of the joint part (42).
Description
Invention field
The present invention relates to a kind of the internal-combustion engine fuel injection valve and manufacture method thereof of (internal-combustion engine is called " motor " below) of being used for.
Background of invention
In general, to drive the fuel injection valve that a valve element opens and closes jetburner be known to electromagnetic ground.In this fuel injection valve, the emitted dose of fuel oil be by change promoting valve element elastic element for example the restoring force of spring adjust.The restoring force of elastic element is for example to adjust (referring to U.S. Patent No. 5165656 and the corresponding Japanese patent application JP 0587264A thereof) that pipe is adjusted by the adjustment element that promotes elastic element.Adjust under the situation of elastic element restoring force by adjusting element this, our suggestion will be adjusted the amount that element is press-fit in the fixed core and adjust restoring force and cram the seam of adjustment element and fixed core after adjusting restoring force by changing.
Yet, use the adjustment element for example to adjust pipe and can cause part to increase and baroque problem, adjust pipe and separate formation with fixed core.In the process that the adjustment element is fixed on the fixed core, fixed core and the contact of adjusting between the element may produce burr and impurity in addition.
This is external to have in the Fuelinjection nozzle of said structure, is installed between fixed core in the cylinder element and the movable core and produces magnetic force.Fixed core is fixed in the cylinder element, and movable core is slidably mounted in the cylinder element and is moved (for example referring to U.S. Patent No. 6616073 and corresponding Japanese patent application JP 2003-166452A thereof) by the magnetic force in the cylinder element.Here, fixed core is relative with moving element, and fixed core is corresponding with the amount of lifting of valve element with the distance between the moving element.Therefore for fuel injection amount accurately is set, must highly precisely adjust the distance between fixed core and the moving element.
Fixed core for example is fixed in the cylinder element by being pressed into to cooperate.Yet when fixed core had radially inwardly outstanding protuberance, that part of hardness that forms protuberance in the fixed core was less than the hardness of fixed core other parts.Therefore, when being pressed into the fixed core that cooperates in the cylinder element, being pressed into and cooperating the required power must be according to the position of fixed core, just fixed core be pressed into the cooperation value, and change, so just reduced the validity of distance adjustment between fixed core and the moving element.In addition, the variation that is pressed into coordinate force causes occurring between fixed core and the cylinder element abnormal contact and produces burr and/or wear particle.
Summary of the invention
In view of problem as described above, the purpose of this invention is to provide a kind of fuel injection valve that reduces a large amount of parts, broken away from labyrinth and generation impurity and easy adjusting elastic element restoring force.
Another object of the present invention provides a kind of manufacturing can be easily and highly precisely adjust the method for the fuel injection valve of elastic element restoring force.
Another object of the present invention provides a kind of fuel injection valve that higher adjustment precision also can prevent the generation of burr and wear particle that has between fixed core and moving element.
Fuel injection valve has cylinder element, moving element, fixed core and elastic element.Cylinder element is near cylindrical and has the fuel gallery that fuel oil flows to jetburner from suction port in this fuel gallery.Moving element be slidably mounted in the cylinder element with cylinder element axially on to-and-fro motion open and close the fuel gallery.Fixed core is used for producing magnetic force and upwards spurs moving element to open the fuel gallery.Fixed core has main body that is fixed in the cylinder element and the anastomosis part of giving prominence to from main body.Elastic element is inserted in and promotes moving element between moving element and the anastomosis part to close the fuel gallery.The anastomosis part is by the restoring force of plastic deformation with the adjustment elastic element.
Description of drawings
According to the detailed description hereinafter as the application's part, the operating method of embodiment's feature and advantage and relevant portion and function will be embodied, in the accompanying drawings:
Fig. 1 is the cross-sectional view according to the fuel injection valve of first embodiment of the invention;
Fig. 2 is the cross-sectional view according to first embodiment's fuel injection valve stationary axle;
Fig. 3 is the cross-sectional view according to the first step of first embodiment's fuel injection valve manufacture process;
Fig. 4 is the cross-sectional view according to second step of first embodiment's fuel injection valve manufacture process;
Fig. 5 is the cross-sectional view according to the 3rd step of first embodiment's fuel injection valve manufacturing process;
Fig. 6 is the cross-sectional view according to the fuel injection valve of second embodiment of the invention;
Fig. 7 is according to the periphery of the fixed core of second embodiment's fuel injection valve and the cross-sectional view of cylinder element;
Fig. 8 is the cross-sectional view of fixed core of the fuel injection valve of a third embodiment in accordance with the invention;
Fig. 9 is the cross-sectional view according to the fixed core of the fuel injection valve of fourth embodiment of the invention;
Figure 10 is the cross-sectional view according to the fixed core of the fuel injection valve of fifth embodiment of the invention;
Figure 11 is according to the fixed core outer peripheral areas of the fuel injection valve of sixth embodiment of the invention and the cross-sectional view of cylinder element;
Figure 12 is according to the fixed core outer peripheral areas of the fuel injection valve of seventh embodiment of the invention and the cross-sectional view of cylinder element;
Figure 13 is according to the fixed core outer peripheral areas of the fuel injection valve of eighth embodiment of the invention and the cross-sectional view of cylinder element;
Figure 14 is according to the fixed core outer peripheral areas of the fuel injection valve of ninth embodiment of the invention and the cross-sectional view of cylinder element.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.Each embodiment has described a fuel injection valve (hereinafter referred to as " sparger "), is used for fuel injection in the suction port of for example combustion chamber of petrol engine.Sparger 10 can also be applied on the G. D. I engine, and wherein sparger is directly fuel injection in its firing chamber or in the diesel engine.
(first embodiment)
Figure 1 shows that sparger 10 according to first embodiment of the invention.
Sparger 10 has the support tube 11 that forms thin-walled and approximate circle tubular.Support tube 11 comprises first magnet part 12, the nonmagnetic body part 13 and second magnet part 14.Nonmagnetic body part 13 prevents magnetic short circuit between first magnet part 12 and second magnet part 14.First magnet part 12 and nonmagnetic body part 13 are connected as a single entity by laser bonding.The same, the nonmagnetic body part 13 and second magnet part 14 also are connected as a single entity by laser bonding.Selectively, first magnet part 12, nonmagnetic body part 13 and second magnet part 14 can integrally be made by magnetic material or analog.In this case, support tube 11 and nonmagnetic body part 13 corresponding parts are by heat treatment or similar process treating and by demagnetization.Support tube 11 has fuel oil suction port 15 in its axial end portion.Unshowned fuel pump provides fuel oil by fuel oil suction port 15 for sparger 10.The fuel oil of providing for fuel oil suction port 15 flows to the inside of support tube 11 from fuel oil filter 16.Fuel oil filter 16 is set at the end of support tube 11, with removing the impurity that is included in the fuel oil.
Valve body 20 is set at the other end of support tube 11, and is relative with fuel oil suction port 15, just in the inside of first magnet part 12.Valve body 20 forms near cylindrical and is fixed on the inner peripheral surface of first magnet part 12.Valve body 20 has valve seat 21, and the interior radial extremity place of valve seat 21 shortens gradually.Jetburner dish 22 is fixed on that relative end face of valve body 20 and support tube 11.Jetburner dish 22 has jetburner 23, and the end face that this jetburner is positioned at valve body 20 1 sides from jetburner dish 22 is communicated to jetburner dish 22 and is positioned at valve body 20 opposite side end faces.Needle 24 is installed in first magnet part 12 and the valve body 20 with can be reciprocal in the axial direction.Needle 24 is provided with coaxially approx with support tube 11 and valve body 20.Needle 24 has hermetic unit 25 at the contiguous place that it is positioned at jetburner dish 22 1 side ends.Hermetic unit 25 contacts with the valve seat 21 of valve body 20.Between needle 24 and valve body 20, formed the fuel gallery 26 of circulation fuel oil.When the hermetic unit 25 of needle 24 raise from valve seat 21, fuel gallery 26 just was communicated with jetburner 23.
Sparger 10 has drive part 30 and is used for valve needle 24.Drive part 30 is electromagnetic actuators that comprise coil 31, housing 32, mobile core 33 and fixed core 40.Coil 31 is wrapped in resin and makes and become on the columniform roll 34.Housing 32 is outer surfaces of being made by magnetic material and cover coil 31.The outer surface of coil 31, housing 32 and support tube 11 are all covered by resinite mould 35.Coil 31 is by terminal 38 conductings of wire element 36 in being arranged on connector 37.Connector 37 is integrally formed with resinite mould 35.
Fixed core 40 is fixed in the coil 31 to be inserted in the support tube 11.Fixed core 40 is made by magnetic material such as iron, and becomes near cylindrical.Having formed spacing between fixed core 40 and the mobile core 33 is the gap of g.The spacing g between fixed core 40 and the mobile core 33 and the lift-off value of needle 24 are corresponding.As shown in Figure 2, fixed core 40 outer appearance cup-shapeds have cylindrical part 41 and bottom (joining portion) 42.Cylindrical part 41 extends vertically.The outer peripheral surface of cylindrical part contacts with the inner peripheral surface that supports pipe 11.Bottom 42 is radially inwardly outstanding on the inner peripheral surface of the end of mobile core 33 1 sides dorsad from cylindrical part 41.Bottom 42 has thorax bore portion 43 in the center of its radius, and the internal communication of this thorax bore portion 43 and cylindrical part 41 is so that fuel oil therefrom flows through.The other end of spring 39, promptly the end of moveable part 33 1 sides directly contacts with the bottom of fixed core 40 dorsad.As shown in Figure 1, the radially inside periphery of bottom 42 is towards mobile core 33 distortion.
Next the assembly that description is had the sparger 10 of said structure.
As shown in Figure 3, with support tube 11, valve body 20 and coil 31 combinations, just formed resinite mould 35.Jetburner dish 22 is fixed on the valve body 20.Combination mobile core 33 and needle 24 all are installed in support tube 11 and the valve body 20.The internal diameter of support tube 11 is a bit larger tham the external diameter of mobile core 33.Therefore, combination mobile core 33 can to-and-fro motion vertically in support tube 11 with needle 24.After combination mobile core 33 and needle 24 were installed in the support tube 11, spring 39 was set at mobile core 33 that side of needle 24 dorsad.Spring 39 is inserted in the support tube 11, and its end on axially contacts with mobile core 33.In this case, neither compressive state neither extended state and have intrinsic total length L for spring 39.
After being installed to spring 39 in the support tube 11, fixed core 40 is installed to the side that spring 39 deviates from mobile core 33.Fixed core 40 is press-fit in the support tube 11.As shown in Figure 4, fixed core 40 is pressed into cooperation, till the gap between itself and the mobile core 33 becomes g.In this case, spring 39 and mobile core 33 relative ends contact with bottom 42.Therefore, by the cooperation that is pressed into of fixed core 40, spring 39 is compressed to the L1 that is shorter than its intrinsic total length L.
As shown in Figure 5, cooperate after fixed core 40 finishes being pressed into, the bottom 42 of regulating 50 pairs of fixed core 40 of drift applies a power.Regulate drift 50 and insert the support tube 11, and jetburner 23 is pressed in that bottom surface that bottom 42 deviates from jetburner 23 sides from the end that support tube 11 deviates from jetburner 23 those sides.Therefore, the bottom 42 that fixed core 40 inner radial are inwardly outstanding is by plastic deformation and to the direction bending of jetburner 23.By making bottom 42 distortion, the bottom 42 of distortion is to the direction pushing spring 39 of jetburner 23.The result makes the total length of spring 39 be reduced to L2 less than total length L 1.Bottom 42 is conditioned drift 50 and pushes insertion, up to the restoring force of spring 39, is about to make up the power that mobile core 33 and needle 24 are pushed jetburner 23 to, reaches till certain determined value.
After the adjusting of the restoring force of finishing spring 39, fuel oil filter 16 is installed in support tube 11 to deviate from the end of valve body 20 those sides.So just finished the assembling of sparger 10.
Next the operation that description is had the sparger 10 of said structure.
When coil 31 does not have voltage, do not produce magnetic attraction between fixed core 40 and the mobile core 33.Therefore, the thrust of spring 39 promotes mobile core 33 makes it away from fixed core 40, and the needle 24 that is connected as a single entity with mobile core 33 is also away from fixed core 40.The result is when coil 33 does not have voltage, and the hermetic unit 25 of needle 24 sits on the valve seat 21.So just there is not fuel from jetburner 23, to spray.
When coil 31 had voltage, the magnetic field that coil 31 produces had formed the magnetic circuit through magnetic flux in housing 32, first magnet part, mobile core 33, fixed core 40 and second magnet part 14.Therefore, just can between fixed core 40 of being separated and mobile core 33, produce magnetic attraction by applying voltage for coil 31 by the thrust of spring 39.When the magnetic attraction that produces between fixed core 40 and mobile core 33 during greater than the thrust of spring 39, combination mobile core 33 moves to fixed core 40 with needle 24.Therefore, the hermetic unit 25 of needle 24 lifts from valve seat 21.In Fig. 1, touch fixed core 40 up to mobile core 33, combination moveable part 33 and needle 24 just stop to move up.
The fuel oil that flows into jetburners 10 from fuel oil suction port 15 further the flow through inside of fuel oil filter 16, support tube 11, the inside of fixed core 40, the thorax bore portion 331 of moveable part 33 and the gap between fuel oil thorax hole 332 and support tube 11 and the needle 24, inflow fuel gallery 26.The fuel oil of inflow fuel gallery 26 is further flowed through and is flowed into the fuel port 23 that is formed on the fuel oil porose disc 22 from needle 24 and the gap between the valve body 20 that valve seat 21 lifts.So fuel sprays from jetburner 23.
When coil 31 did not have voltage once more, the magnetic attraction between fixed core 40 and the mobile core 33 disappeared.Thereby the thrust of spring 39 makes the mobile core 33 that is connected as a single entity with needle 24 move to the direction away from fixed core 40.Therefore hermetic unit 25 is sitting in the fuel oil circulation of interrupting on the valve seat 21 between fuel gallery 26 and the jetburner 23 once more.So fuel injection stops.
In the first above-mentioned embodiment, spring 39 directly contacts with the end that fixed core 40 deviates from mobile core 33 1 sides.By the restoring force that makes fixed core 40 bottoms, 42 plastic deformations come Regulation spring 39.Therefore do not need particular element to come the restoring force of Regulation spring 39.Also have, in the process of Regulation spring 39 restoring forces, the element of fuel injector 10 can not contact with each other.Thereby the quantity that just might reduce part is simplified the structure of fuel injector 10 and is prevented that the contact between the element from producing impurity.Also have,, just do not have impurity to be mixed between needle 24 and the valve body 20, prevent the unexpected injection of fuel oil like this by preventing to produce impurity.
In first embodiment, the restoring force of spring 38 is to regulate by the plastic deformation of fixed core 40 bottoms 42.Therefore, can come the highly precisely restoring force of Regulation spring 38 according to the amount of deformation of bottom 42.Therefore, do not consider the strength of element, can be at an easy rate the restoring force of spring 39 highly precisely be adjusted to certain determined value.
Further, bottom 42 is set at the end that fixed core 40 deviates from mobile core 33 those sides.Therefore, the very big spring of total length 39 can be installed in the fixed core 40.Then, even the total length of spring 39 is very big, spring 39 also can be installed in the fixed core 40 under the big prerequisite of the total length change that does not make sparger 10.So, can reduce the size of main body.Again further, become big by the length of controlling fuel injector 10 according to the increase value of spring 39 total lengths, spring 39 can have enough required total lengths.So the restoring force of spring 39 has very big elasticity.
(second embodiment)
Fig. 6 has described the sparger 10 according to second embodiment of the invention.The identical member with among first embodiment of sparger 10 marks identical reference character in a second embodiment, and omits description of them.
As shown in Figure 6, the fixed core 50 that has the fixed core 40 that is different among first embodiment according to second embodiment's sparger 10.As shown in Figure 6 and Figure 7, fixed core 50 also has small diameter portion 54 except having cylindrical part 51 and bottom (joining portion) 52.The outer diameter of small diameter portion 54 is littler than the outer diameter of cylindrical part 51.Small diameter portion 54 is formed on the end that fixed core 50 deviates from mobile core 33 1 sides.Radially inwardly give prominence to from the inner circumference of small diameter portion 54 bottom 52.Bottom 52 has thorax bore portion 53 at its radial center place, and thorax bore portion 53 is connected so that fuel oil therefrom flows through with the inner space and the small diameter portion 54 of cylindrical part 51.As shown in Figure 6, the radially inner peripheral of bottom 42 part is illustrated by the broken lines in Fig. 7 to the distortion of mobile core 33 places.
The small diameter portion 54 of fixed core 50 has gap 17 between the inner peripheral surface of the outer peripheral surface of fixed core 50 and support tube 11.The shape of small diameter portion 54 just in time can make its outer peripheral surface approximate parallel and coaxial with the inner peripheral surface of support tube 11.The gap 17 that forms between small diameter portion 54 and support tube 11 extends beyond the respective length of small diameter portion 54 in the axial direction.Represent bottom 52 wall thickness with t, represent small diameter portion 54 length in the axial direction with x, and satisfy the relation of x 〉=t.Therefore, small diameter portion 54 is set to the outside that radially is positioned at bottom 52.So gap 17 is set between the periphery and support tube 11 of bottom 52.
In the process of assembling sparger 10, combination needle 24 and mobile core 33 form moveable part, and are installed in support tube 11 inside.After combination mobile core 33 and needle 24 be installed, spring 39 was placed on that side that mobile core 33 deviates from needle 24.In this case, spring 39 neither compresses and does not also extend, and has intrinsic total length L.After spring 39 had been installed, fixed core 50 was installed in that side that spring 39 deviates from mobile core 33.Fixed core 50 is press-fit in the support tube 11.So an end of spring 39 contacts with mobile core 33, the other end of spring 39 contacts with the bottom 52 of fixed core 50.Then, fixed core 50 is press-fit in the support tube 11 by the further direction towards mobile core 33.Cooperate fixed core 50 by being pressed into, be compressed with bottom 52 contacted springs 39.
As indicated above, fixed core 50 has small diameter portion 54 in the end that it deviates from moveable part 33 those sides, and also radially inwardly give prominence on small diameter portion 54 bottom 52.Therefore, when being installed to fixed core 50 in the support tube 11, have only the cylindrical part 51 of fixed core 50 to be press-fit in the support tube 11.That is to say that small diameter portion 54 is not pressed into fixed core 50 with support tube 11 contacts yet and cooperates.
Here, by being that fixed core 50 is provided with radially inwardly outstanding bottoms 52, it is the bigger hardness of cylindrical part 51 that fixed core 50 has than other parts in the part that forms bottom 52.Do not have in fixed core under the situation of small diameter portion 54, be pressed into and cooperate fixed core 50 that part of required power to be greater than to be pressed into the power that cooperates cylindrical part 51 required with bottom 52.Therefore, be pressed into that to cooperate the required power of fixed core 50 be that the use level that is pressed into of fixed core 50 changes according to the different piece of fixed core 50.
On the contrary, in a second embodiment, the cylindrical part 51 that has only fixed core 50 to have constant wall thickness is press-fit in the support tube 11.That is to say that bottom 52 is outstanding from small diameter portion 54, yet as indicated above, small diameter portion 54 is not pressed into cooperation with fixed core 50.Therefore, being pressed into cooperation fixed core 50 required power just can not change according to the use level that is pressed into of fixed core 50.Therefore, the power that applies an intensity approximately constant just can be press-fit to fixed core 50 in the support tube 11.
Gap between fixed core 50 and mobile core 33 reaches apart from g, and fixed core 50 just stops to be pressed into cooperation.Cooperate after fixed core 50 finishes being pressed into, the bottom 52 of fixed core 50 just towards mobile core 33 bendings, as shown in Figure 6, is illustrated by the broken lines in Fig. 7.Therefore, just can be highly the accurate total length of Regulation spring 39.In other words be exactly the restoring force of Regulation spring 39, promptly promote the power of combination needle 24 and mobile core 33.
In the second above-mentioned embodiment, the bottom 52 of fixed core 50 is formed on small diameter portion 54 and radially inwardly gives prominence to.Therefore, fixed core 50 is being press-fit in the process of support tube 11, is having only cylindrical part 51 to be press-fit in the support tube 11 with fixed core 50, small diameter portion 54 also is pressed into cooperation not together.The result is, small diameter portion 54 is owing to the outstanding of bottom 52 has very big hardness, and it is not press-fit in the support tube 11.Therefore, do not considering that under the situation that is pressed into use level of fixed core 50, it is approximately constant that standing part 50 is press-fit to power required in the support tube 11.So, just might highly precisely be set between fixed core 50 and the mobile core 33 the spacing g in the gap that forms.Further, be pressed into when cooperating fixed core 40, be applied to that soil fertility is an approximately constant on the fixed core 50.This has prevented the irregular contact between fixed core 50 and the support tube 11.So just can prevent burr and wear particle.
In a second embodiment, radially inwardly outstanding bottom 52 is further used as fixed core 50 and spring 39 contacted anastomosis parts on the small diameter portion 54.In other words be exactly that the spring 39 that promotes combination needle 24 and mobile core 33 directly contacts with the end that fixed core 50 deviates from mobile core 33 those sides.Then, by bending, i.e. the plastic deformation of the bottom 52 of fixed core 50, the restoring force of coming Regulation spring 39.Therefore, just do not need particular element to come the restoring force of Regulation spring 39.Therefore, the quantity that might reduce part is come simplified structure.Further, the restoring force of the plastic deformation Regulation spring 39 of the bottom 52 by fixed core 50, the restoring force of spring 39 can obtain according to the amount of deformation of bottom 42 regulating highly accurately.So, under the situation of not considering the element strength, can be at an easy rate highly precisely the restoring force of spring 39 be adjusted to certain determined value.
(the 3rd embodiment)
Fig. 8 has described the fixed core 60 of sparger 10 according to the third embodiment of the present invention shown in it.Here with first embodiment in the member of identical sparger 10 all use identical reference character to represent, and omit description of them.
As shown in Figure 8, in the 3rd embodiment, fixed core 60 has anastomosis part 62 at cylindrical part 71 middle parts on it is axial.Anastomosis part 62 forms from the inner circumference of the cylindrical part 61 of fixed core 60 and radially inwardly gives prominence to.Anastomosis part 62 has thorax bore portion 63 at its radial midpoint place, and fuel oil therefrom flows through.Spring 39 contacts with joining portion 62 at that side end that deviates from mobile core 33.In the 3rd embodiment, fixed core 60 is being press-fit in the process of support tube 11, the power that is pressed into cooperation is applied to fixed core 60 and deviates from the end face 64 of mobile core 33 those sides.When the restoring force of Regulation spring 39, on joining portion 62, apply a power and make its plastic deformation.Therefore, in fixed core 60, apply the position that the position that is pressed into coordinate force is different from the power that applies Regulation spring 39 restoring forces.
In the 3rd embodiment, fixed core 60 is applied the position that the position that is pressed into coordinate force is different from the power that applies Regulation spring 39 restoring forces.Therefore prevented that fixed core 60 is moved and joining portion 62 generation unnecessary deformation when being pressed into cooperation in the process of joining portion 62 plastic deformations.So, just might improve between fixed core 60 positional accuracys and fixed core 60 and the mobile core 33 validity apart from g.
(the 4th and the 5th embodiment)
Fig. 9 and Figure 10 have described according to the present invention the fixed core 40,60 of the 4th and the 5th embodiment's sparger 10 respectively.Here with the first or the 3rd embodiment in the member of identical sparger 10 all use identical reference character to represent, and omit description of them.
The 4th embodiment is first embodiment's improvement embodiment.As shown in Figure 9,42 those sides towards mobile core 33 have thin-walled portion 45 to fixed core 40 in the bottom.Thin-walled portion 45 is set to have the wall thickness thinner than cylindrical part 41.Therefore, the power of small intensity just can make bottom 42 distortion relatively.
The 5th embodiment is the 3rd embodiment's improvement embodiment.As shown in figure 10, fixed core 60 has thin-walled portion 65 in mobile core 33 those sides at the joining portion 62 between its axial two ends.Therefore, a relatively little power just can easily make anastomosis part 62 distortion.
In the 4th and the 5th embodiment, by for fixed core 40,70 thin-walled portion 45,75 being set, the power of small intensity just can easily make bottom 42 or joining portion 72 distortion relatively.So, just might be easily the restoring force of Regulation spring 39 accurately.
(the 6th embodiment)
Figure 11 has described the fixed core 70 of sparger 10 according to a sixth embodiment of the invention.Here identical member all uses identical reference character to represent among sparger 10 and second embodiment, and has omitted description of them.
As shown in figure 11, in the 6th embodiment, fixed core 70 has tapering part 72, and its external diameter deviates from the diameter of the end of mobile core 33 those sides less than cylindrical part 71.Along with at tapering part 70 in the end that deviates from mobile core 33 those sides away from mobile core 33, tapering part 72 radially slopes inwardly.Therefore, in away from mobile core 33, the distance between the outer peripheral surface of the tapering part 72 of fixed core 70 and the inner peripheral surface of support tube 11 is becoming big.The wall thickness t that sets tapering part 72 satisfies the relation of t≤1/2h, and wherein h represents the wall thickness of cylindrical part 71.Therefore, the hardness of tapering part 72 is greater than the hardness of cylindrical part 71.
By cone-shaped section 72 being set, between the inner peripheral surface of the outer peripheral surface of cone-shaped section 72 and support tube 11, formed gap 17 for fixed core 70.The inner peripheral surface of the outer peripheral surface of cone-shaped section 72 and support tube 11 forms a special angle mutually.Cone-shaped section 72 be formed in fixed core 70 axially on have given length.Therefore, cone-shaped section 72 and support tube 11 form the gap 17 that surpasses a certain length in the axial direction.Further, owing to cone-shaped section 72 tilts, thereby along with distance mobile core 33 is more and more far away, gap 17 becomes increasing.Further again, because cone-shaped section 72 is radially intilted, thereby cone-shaped section 72 is radially inwardly given prominence to from cylindrical part 71.Therefore, cone-shaped section 72 is provided at the small diameter portion that forms gap 17 between himself and the support tube 11, and from the outstanding projection of cylindrical part 71.Also have, the end that spring 39 deviates from moveable part 33 those sides contacts with the inner peripheral surface of cone-shaped section 72.Therefore, cone-shaped section 72 is as the anastomosis part.
In the 6th embodiment, in the process of the restoring force of Regulation spring 39, as among Figure 11 with shown in the dotted line, cone-shaped section 72 bendings are radially inwardly to shrink.Because cone-shaped section 72 bendings are radially inwardly to shrink, spring 39 moves to mobile core 33 places with cone-shaped section 72 contacted ends.Therefore, the total length of spring 39 changes, so just can be easily the restoring force of Regulation spring 39 highly precisely.
In the 6th embodiment, the diameter of the cone-shaped section 72 of fixed core 70 is less than the diameter of cylindrical part 71, and cone-shaped section 72 does not contact with support tube 11.Therefore, have only cylindrical part 71 to be pressed into cooperation together, and cone-shaped section 72 also is pressed into cooperation not together.Then, the cylindrical part 71 that has only fixed core 70 to have the approximately constant wall thickness is pressed into and is engaged in the support tube 11.So, be used for being pressed into that to cooperate the power of fixed core 70 can be approximately constant, and can have very high validity apart from g between fixed core 70 and the mobile core 33.Further, in the 6th embodiment, fixed core 70 is being pressed in the process that is engaged in the support tube 11, is being pressed into the power that cooperates fixed core 70 and is applied on the step portion 74 between cylindrical part 71 and the cone-shaped section 72.Therefore, applying the position of defeating into cooperation fixed core 70 is step portion 74, and the position that applies the restoring force of power Regulation spring 39 is a cone-shaped section 72.The result is that these two positions are different, and might prevent that fixed core 70 is moved and is being pressed into cone-shaped section 72 unnecessary deformation in the process that cooperates fixed core 70 in the process of cone-shaped section 72 distortion.So, might improve the position precision of fixed core 70 and the validity between fixed core 70 and mobile core 33 apart from g.
(the 7th, the 8th and the 9th embodiment)
Figure 12 to Figure 14 has described the fixed core 40 according to the 7th, the 8th and the 9th embodiment's sparger 10 of the present invention respectively.Here with second embodiment in the identical member of member of sparger 10 all use identical reference character to represent, and omit description of them.
In the 7th, the 8th and the 9th embodiment, in order to form the gap between fixed core 40 and support tube 11, support tube 11 has diameter expansion part 11a, 11b or 11c.
In the 7th embodiment, support tube 11 has than major diameter part (diameter expansion part) 11a, and it radially is positioned at the outside of the bottom 42 of fixed core 40.Than the inner diameter of major diameter part 11a cylindrical part 41 contacted parts greater than those and fixed core 40.Therefore, support tube 11 than major diameter part 11a on, formed the gap 17 between the inner peripheral surface of the outer peripheral surface of fixed core 40 and support tube 11.
In the 8th embodiment, support tube 11 has cone-shaped section (diameter expansion part) 11b, and it radially is positioned at the outside of the bottom 42 of fixed core 40.The inner diameter of cone-shaped section 11b is contacted that part of to 15 expansions of fuel oil suction port with cylindrical part 41 in fixed core 40 from it.Therefore, at the cone-shaped section 11b place of support tube 11, formed the gap 17 between the inner peripheral surface of the outer peripheral surface of fixed core 40 and support tube 11.
In the 9th embodiment, support tube 11 has recess (diameter expansion part) 11c, and it radially is positioned at the outside of the bottom 42 of fixed core 40.Recess 11c forms on the circumferencial direction of support tube 11 and extends.The inner diameter of recess 11c is contacted that part of greater than fixed core 40 and cylindrical part 41.In other words be exactly recess 11c with respect to going out with support tube 11 contacted part radially outwards are recessed on the fixed core 40.Therefore, at the recess 11c place of support tube 11, formed the gap 17 between the inner peripheral surface of the outer peripheral surface of fixed core 40 and support tube 11.
In the 7th, the 8th and the 9th embodiment, by being that support tube 11 is provided with than major diameter part 11a, cone-shaped section 11b or recess 11c have formed the gap 17 between support tube 11 and the fixed core 40.That is to say,, not only can handle fixed core 40, can also handle support tube 11 in order to form gap 17.In these embodiments, the outer peripheral surface of fixed core 40 bottoms 42 does not contact with support tube 11.Therefore, have only cylindrical part 41 to be pressed into cooperation together, and the outer peripheral surface of bottom 42 is not pressed into cooperation together.Then, have only the cylindrical part 41 of fixed core 40 to be press-fit in the support tube 11.So the power that applies when being pressed into cooperation fixed core 40 just becomes constant, the validity of the spacing g between fixed core 40 and the mobile core 33 also is improved.
What the foregoing description was described is that moveable part comprises the independent mobile core 33 that is shaped and the example of needle 24.Yet mobile core 33 and needle 24 also can be integrally formed.In some embodiments, the jetburner dish 22 with jetburner 23 is fixed on the valve body 20, yet valve body 20 itself can have jetburner.Further, example that to be spring 39 directly contact with fixed core or mobile core that some embodiments describes, yet, between spring 39 and fixed core and/or mobile core, also another element can be set.Further, some embodiment has described the example that magnetic field that support tube 11 produces owing to coil 31 forms magnetic circuit.Yet support tube 11 is not limited to form the element of magnetic circuit, and the present invention can be applied on any element that fixed core can be installed in wherein.
In the above-described embodiments, using embodiments of the invention is single descriptions, yet a plurality of embodiments can join together to describe.
Here the description of this invention is exemplary description in essence, and therefore, the change that does not deviate from main idea of the present invention all should be within the scope of the invention.This change should not be regarded as having run counter to the spirit and scope of the present invention.
Claims (17)
1. a fuel injection valve (10) comprising:
Cylinder element (11), it forms near cylindrical, and has fuel gallery (26) so that fuel oil flow to jetburner (23) from suction port (15);
Moveable part (33), it is made by magnetic material, is slidably mounted in the cylinder element (11), opens and closes fuel gallery (26) with the to-and-fro motion of axially going up at cylinder element (11);
Fixed core (40,50,60,70), it is used for producing magnetic force and draws moveable part (33) and move upward and open fuel gallery (26), and has
-be fixed in the cylinder element main body (41,51,61,71) and
-go up outstanding anastomosis part (42,52,62,72) from main body (41,51,61,71); With
Elastic element (39), it is inserted in and is used for promoting moveable part (33) between moveable part (33) and anastomosis part (42,52,62,72) and closes fuel gallery (26),
And anastomosis part wherein (42,52,62,72) are regulated elastic element (39) by plastic deformation restoring force.
2. fuel injection valve according to claim 1 (10), wherein anastomosis part (42,52,72) are formed on the end of main body (41,51,71) and the opposite side of moveable part (33).
3. fuel injection valve according to claim 2 (10), wherein:
Main body (41,51) has the profile of near cylindrical; And
Anastomosis part (42,52) is radially inwardly outstanding from the inner peripheral surface of main body (41,51) end.
4. fuel injection valve according to claim 2 (10), wherein:
Main body (71) has cylindrical outer shape; And
Anastomosis part (72) extension that radially slopes inwardly from the end of main body (71).
5. fuel injection valve according to claim 1 (10), wherein anastomosis part (62) are formed between the axial two ends of main body (61).
6. fuel injection valve according to claim 1 (10), wherein:
Main body (51) has small diameter portion (54), and the outer peripheral surface of main body (51) is radially inwardly recessed therein; And
Radially inwardly give prominence on small diameter portion (54) anastomosis part (52).
7. fuel injection valve according to claim 1 (10), wherein:
(42,62) are positioned at moveable part one side and have thin-walled portion (45,65) main body (41,61) in the anastomosis part.
8. according to arbitrary described fuel injection valve (10) in the claim 1 to 7, wherein the wall thickness t of anastomosis part (42,52,62,72) satisfies the relation of 0.1mm≤t≤1.0mm.
9. the method for a manufacturing fuel injection valve (10), described fuel injection valve (10) comprising:
Cylinder element (11), it forms near cylindrical, and has fuel gallery (26) so that fuel oil flow to jetburner (23) from suction port (15);
Moveable part (33), it is slidably mounted in the cylinder element (11), opens and closes fuel gallery (26) with the to-and-fro motion of axially going up at cylinder element (11);
Fixed core (40), it is used for producing magnetic force and moveable part (33) is moved open the fuel gallery, and has
-be fixed in the cylinder element main body and
-from the radially inwardly outstanding projection of main body; With
Be inserted in and be used for promoting the elastic element that movable part assigns to close the fuel gallery between moveable part and the anastomosis part,
And this manufacture method comprises by making the anastomosis part plastic deformation regulate the step of the restoring force of elastic element.
10. a fuel injection valve (10) comprising:
Cylinder element (11), it forms near cylindrical, and has fuel gallery (26) so that fuel oil flow to jetburner (23) from suction port (15);
Moveable part (33), it is made by magnetic material, is slidably mounted in the cylinder element (11), opens and closes fuel gallery (26) with the to-and-fro motion of axially going up at cylinder element (11);
Fixed core (50,70), it is used for producing magnetic force and comes mobile moveable part (33) opening the fuel gallery, and has
-be fixed in the cylinder element main body (51,71) and
-from the radially inwardly outstanding projection (52,72) of main body (51,71); And
Wherein, gap (17) are formed between at least a portion of outer peripheral surface of the inner peripheral surface of cylinder element (11) and fixed core (50,70), and this at least a portion is the radial outside of projection (52).
11. fuel injection valve according to claim 10 (10), wherein:
Main body (51) has small diameter portion (54), and the outer peripheral surface of main body (51) is radially inwardly recessed therein; And
Gap (17) is formed on the radially outer of small diameter portion (54).
12. fuel injection valve according to claim 11 (10), wherein the outer peripheral surface of small diameter portion (54) is approximate parallel with the inner peripheral surface of cylinder element (11).
13. fuel injection valve according to claim 10 (10), wherein:
Protruding part (72) extends to such an extent that radially slope inwardly from the end of main body (71); And
Gap (17) is formed on the radially outer of projection (72).
14. fuel injection valve according to claim 13 (10), wherein protruding part (72) is to form like this: the distance between the inner peripheral surface of the outer peripheral surface of protruding part (72) and cylinder element (11) is along with become big away from moveable part (33).
15. fuel injection valve according to claim 10 (10), wherein:
Cylinder element (11) has the diameter expansion part, and (11c), radially outward is recessed therein for the inner peripheral surface of cylinder element (11) for 11a, 11b; And
Gap (17) is formed on diameter expansion part (11a, 11b, inner radial 11c).
16. according to the arbitrary described fuel injection valve (10) in the claim 10 to 14, further comprise and be inserted in moveable part (33) and projection (42,72) elastic element between (39) is used for promoting moveable part (33) on the direction that can close fuel gallery (26).
17. fuel injection valve according to claim 16 (10), wherein projection (42,72) is regulated the restoring force of elastic element (39) by plastic deformation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP247014/2004 | 2004-08-26 | ||
| JP2004247013A JP4178408B2 (en) | 2004-08-26 | 2004-08-26 | Fuel injection valve and manufacturing method thereof |
| JP247013/2004 | 2004-08-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1740548A CN1740548A (en) | 2006-03-01 |
| CN100427750C true CN100427750C (en) | 2008-10-22 |
Family
ID=36093047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100965301A Expired - Fee Related CN100427750C (en) | 2004-08-26 | 2005-08-26 | Fuel injector valve and producing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4178408B2 (en) |
| CN (1) | CN100427750C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016203083A1 (en) * | 2016-02-26 | 2017-08-31 | Robert Bosch Gmbh | magnetic valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58155272A (en) * | 1982-03-11 | 1983-09-14 | Mitsubishi Electric Corp | Fuel injection device |
| JPH01150083A (en) * | 1987-12-03 | 1989-06-13 | Nippon Denso Co Ltd | Solenoid three way valve |
| CN1190453A (en) * | 1995-05-19 | 1998-08-12 | 美国西门子汽车公司 | Bottom feed injector with top calibration feed |
| US20040050978A1 (en) * | 2002-09-18 | 2004-03-18 | Koichi Sugiyama | Electromagnetic fuel injection device for internal combustion engine |
-
2004
- 2004-08-26 JP JP2004247013A patent/JP4178408B2/en not_active Expired - Fee Related
-
2005
- 2005-08-26 CN CNB2005100965301A patent/CN100427750C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58155272A (en) * | 1982-03-11 | 1983-09-14 | Mitsubishi Electric Corp | Fuel injection device |
| JPH01150083A (en) * | 1987-12-03 | 1989-06-13 | Nippon Denso Co Ltd | Solenoid three way valve |
| CN1190453A (en) * | 1995-05-19 | 1998-08-12 | 美国西门子汽车公司 | Bottom feed injector with top calibration feed |
| US20040050978A1 (en) * | 2002-09-18 | 2004-03-18 | Koichi Sugiyama | Electromagnetic fuel injection device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1740548A (en) | 2006-03-01 |
| JP4178408B2 (en) | 2008-11-12 |
| JP2006063876A (en) | 2006-03-09 |
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