CN1339654A

CN1339654A - Electromagnetic valve and fuel jet device

Info

Publication number: CN1339654A
Application number: CN 01124190
Authority: CN
Inventors: 大畑耕一; 鸟谷尾哲也; 东条千太
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2000-08-21
Filing date: 2001-08-20
Publication date: 2002-03-13
Anticipated expiration: 2021-08-20
Also published as: JP3633885B2; CN1208547C; JP2002139168A; DE10140789A1

Abstract

A fuel injection arrangement (1) with a solenoid valve (40). A distance D between the surface on the fixing member side of an armature (60) and the fixing member (70) is set to 5-60 mu m. By setting the upper limit valve of the distance D to 60 mu m, a move part receives an abruptly increasing counterforce pointing to a fixed core from the liquid between the move part and fixed part, after power cut of a coil (43) and before the move part just finishes moving, accordingly, the collision impact is released when a valve (50) is against the second plate (82), moreover, the flop of the valve is confined. Besides, the lower limit of the distance is 5 mu m, so after the coil being dischaged and the move part starts moving, the starting time of the move part does not markedly delay by the adhesion of the liquid overlaped between the move part and the fixed part.

Description

Solenoid valve and fuel injection system

Invention field

The present invention relates to a kind of solenoid valve and a kind of fuel injection system that this solenoid valve is housed.

Background technique

In a kind of traditional electrical magnet valve, one is opened and closed one by the power-actuated valve member of electromagnetism by running and is used to opening that fluid is flowed through.For example, opening by coil electricity in the solenoid valve of opening, when coil was not switched on, valve member is urged utensil such as spring promotes and rests on the valve seat to close opening along the opening closing direction.Behind coil electricity, moving part is created within an electromagnetic force in the fixed magnetic core that surrounds coil and inhales to this fixed magnetic core, so that valve member moves with moving part, thereby opens opening.Valve member one with moving part opposed the guiding of fixed block under move.

Come on the valve seat when closing opening when valve member props up, valve member can be under the thrust of pushing utensil powerful collision formed the valve seat of opening.Along with valve member moves and collide valve seat with high speed, can between valve member and valve seat, impact, thereby cause valve member on valve seat, to be beated.Opening can be forced to open in repeatedly beating.Therefore, be used for for example solenoid valve of fuel injection system, beating of valve member will cause that one is used for promoting the fuel pressure decline of needle with the pressure control cavity of opening and closing spray-hole along the spray-hole closing direction, surpasses preset time thereby cause fuel to spray.

In order to solve the valve member problem of beating, a kind of Perfected electromagnetic metering valve that is used for fuel injection system is well-known, as disclosed among the JP-A-9-166063.According to this Perfected electromagnetic metering valve, beating during valve member collision valve seat is subjected to the restriction of a moving part, and for the purpose that reduces moving part weight, moving part is made by two elements.

Yet the moving part of being made by two elements can cause the complex structure of solenoid valve, thereby and the build of solenoid valve is bigger.

Summary of the invention

An object of the present invention is to provide a kind of solenoid valve, wherein valve member beating when the collision valve seat is restricted, and don't the build making of solenoid valve is too much, in addition, also will provide the fuel injection system that this solenoid valve is housed.

Another object of the present invention provides a kind of solenoid valve, wherein is used for moving part is inhaled stronger to the electromagnetic attraction of fixed magnetic core, and provides the fuel injection system that this solenoid valve is housed.

In order to achieve the above object, a kind of solenoid valve is used to be installed in a valve base piece, valve base piece has the opening and the valve seat around opening that are used to flow through fluid, in this solenoid valve, a moving part moves axially with a valve member, valve member rests on the valve seat or lifts off a seat, thereby opening is opened or closed.When a coil was recharged, the magnetic force that moving part is produced was inhaled to a fixed magnetic core that surrounds coil.An end face of a fixed block is mutually opposed with the end face that is positioned at the fixed magnetic core opposition side on the moving part, and another end face is towards valve base piece.

Utilize above-mentioned solenoid valve, when valve member was closed opening, the distance D between the end face opposite each other on moving part and the fixed block was positioned at a prespecified range with lower limit and upper limit.Lower limit is set to such distance, promptly is recharged and moving part is prepared after beginning opens direction along opening and move at coil, and the adhesive force that the motion actuated time of moving part can not be superimposed on the fluid between moving part and the fixed block significantly postpones.The upper limit is set to such distance, promptly after coil blackout and just finish before the moving of opening closing direction at moving part, moving part can be from being superimposed upon the reaction force that fluid between moving part and the fixed block receive a sensing fixed magnetic core that increases suddenly.Suddenly the reaction force of the sensing fixed magnetic core that increases will cause just reducing the speed of moving part before valve member collision outbreak, come to the impact that produces on the valve seat thereby alleviate because of valve member props up, with restriction valve member beating on valve seat.

Preferably make the following of distance D be limited to 5 μ m, and distance D on be limited to 60 μ m.

Preferably at least one the position integral body with moving part and valve member forms as one.Owing to do not need by welding or use other binding members that moving part and valve member are combined, so the weight of valve member is lighter, and the required electromagnetic attraction that is created between fixed magnetic core and the moving part is littler.Therefore, the build of fixed magnetic core and coil is compacter, and the current drain of coil is littler.

The axial length of valve member and fixed block has the manufacturing dimension tolerance respectively.Therefore, preferably behind the axial length of having measured a plurality of valve members and fixed block, any one valve member and any one fixed block are optionally assembled, so that distance D is positioned at the prespecified range from lower limit to the upper limit.

Valve member is made up of a contact member and a shaft element, and contact member is used to rest on valve seat, and an end of shaft element is keeping contact member, and the other end combines with moving part.In this case, the axial length of valve member is the axial length sum of contact member and shaft element.

In addition, fixed block is made of the first and second different fixed blocks of axial length.Behind the axial length of having measured a plurality of first and second fixed blocks respectively, any one first fixed block and any one second fixed block are optionally assembled, so that distance D is positioned at the prespecified range with lower limit and upper limit.

In addition, fixed block is made by a kind of material with given yield point value, this yield point reaches such degree, and promptly when the fixed block brute force was pushed valve base piece, fixed block can plastic deformation.Like this, can guarantee to have between fixed block and the valve base piece sealing of fluid-tight formula.

In addition, preferably make fixed block have a non magnetic element of making by nonmagnetic substance.Non magnetic element can be arranged in the end place that is positioned at fixed magnetic core one side on the fixed block, and perhaps fixed block self can be made by nonmagnetic substance.Utilize this structure, the magnetic flux that the magnetic circuit that constitutes from fixed magnetic core and moving part leaks on the fixed block can be suppressed, thereby increases the electromagnetic attraction between fixed magnetic core and the moving part effectively.

In addition, moving part is provided with otch on its excircle, and each otch has given depth respectively and extends vertically.These otch not only can be used in restriction and produce vortex current because of electromagnetic attraction in moving part, but also can discharge the fluid that is superimposed upon between moving part and the fixed block reposefully.

Moving part can also be provided with through hole its one on the position of fixed magnetic core between inboard pole surface and outside pole surface, the break-through vertically respectively of each through hole.Through hole is used to discharge the fluid that is superimposed upon between moving part and the fixed block, and don't can have a negative impact to electromagnetic attraction, and this is because through hole is placed on the position that does not constitute magnetic circuit.

Also preferably make the area of the area of inboard pole surface greater than outside pole surface.This structure is used to increase electromagnetic attraction, because can be stopped by outside pole surface from the magnetic flux of inboard pole surface outflow.

Description of drawings

By reading following detailed description, the attached and accompanying drawing that constitutes the application's part, be appreciated that the function of other characteristics of the present invention and advantage and operating method and associated components.In the accompanying drawings:

Fig. 1 is a kind of sectional view that is equipped with according to the fuel injection system of the solenoid valve of first embodiment of the invention;

Fig. 2 is the partial enlarged drawing of the solenoid valve among Fig. 1;

Fig. 3 is another partial enlarged drawing of the solenoid valve among Fig. 1;

Fig. 4 is the sectional view that the line IV-IV in Fig. 3 is done;

Fig. 5 is the plotted curve with respect to the relation of distance D between transit time after valve member position and the valve shutdown command;

Fig. 6 is the plotted curve with respect to the relation of distance D between transit time after valve member position and valve are opened order;

Fig. 7 is the plotted curve that distance D and valve are opened the relation between the time lag, in order to determine the scope that is provided with of distance D;

Fig. 8 is the local amplification view according to the solenoid valve of second embodiment of the invention;

Fig. 9 is the plan view of fixed block when armature one side is seen in the solenoid valve among Fig. 8.

The specific embodiment (first embodiment)

The fuel that is used in of describing according to first embodiment below with reference to Fig. 1 and 2 sprays dress Magnetic valve in putting. Fuel under high pressure by petrolift (not shown) and from one with The common rail (not shown) that predetermined pressure is being assembled fuel is fed to fuel injection device In 1.

Fuel injection device 1 mainly comprises a nozzle body 10, needle 20, Individual valve body 30 and a magnetic valve 40.

Needle 20 be slidably received within the nozzle body 10 that forms substantial cylindrical in In the circumference. Nozzle body 10 is provided with spray-hole 11 at its front end, and section is provided with usefulness within it In the fuel tank 12 that stores fuel under high pressure.

Needle 20 is axially repeatedly mobile in the inner periphery of nozzle body 10 and valve body 30. Needle 20 has a slipper 21 that can slide in the inner periphery of nozzle body 10. Needle 20 is provided with a frustum of a cone with respect to slipper 21 in spray-hole 11 1 sides Part 22 and a tapered segment 23. Frusto-conical portion 22 and tapered segment 23 it Between surface-boundary consist of a contact portion 24, this contact portion rests on one in spray The entrance side of perforation 11 is formed on the valve seat 13 in the nozzle body 10.

Valve body 30 is fixed on the nozzle body by a stop nut 31. A control Piston 32 is contained in the valve body 30, in order to move axially. Position on the control piston 32 End in spray-hole 11 1 sides contacts with needle 20. A pressure chamber 33 forms In first plate 81 and control piston 32 on an end that is positioned at spray-hole 11 opposition sides The place.

Be provided with a fuel under high pressure conduit 34 in the valve body 30, fuel under high pressure is by this conduit Be fed in the valve body. Fuel under high pressure conduit 34 and the first fuel under high pressure conduit 341 and Two fuel under high pressure conduits 342 are communicated with. The first fuel under high pressure conduit 341 is valve body 30 Hes Axially extend in the nozzle body 20 and be communicated with fuel tank 12. The second fuel under high pressure conduit 342 Be communicated with the low-pressure tube 401 in pressure control cavity 33 and the magnetic valve 40. Be fed to Part in the fuel in the two fuel under high pressure conduits 342 is passed first plate 81 by one Fuel conductor 811 be fed in the pressure control cavity 33. Be fed to second fuel under high pressure Another part in the fuel in the conduit 342 is by being formed on the fuel in second plate 82 Conduit 821 and pipe valve 822 are ejected in the low-pressure tube 401, and second plate has consisted of one Valve seat.

Be provided with a spring cavity 35 of arranging spring 351 in the valve body 30. Spring 351 Promote needle 20 along the direction of closing spray-hole 11.

As shown in Figure 3, first and

second plates

81 and 82 are placed on the spray-hole 11 Be positioned at an end place of spray-hole 11 opposition sides. As shown in figs. 1 and 3, pressure control cavity 33 By the end face 81a facing to a side of spray-hole 11 on first plate 81, valve body 30 The end face 32a that is positioned at spray-hole 11 opposition sides on inner circumferential surface and the control piston 32 Consist of. As shown in Figure 3, be provided with a fuel conductor 811, this conduit in first plate 81 Be communicated with fuel under high pressure conduit 342 and the pipe valve 812 that is positioned at fuel conductor 811 1 ends. Also be provided with a fuel bath 813 in first plate 81, its end by pipe valve 812 and with Fuel conductor 811 is communicated with, and the other end is communicated with the through hole 814 that passes first plate 81. One end of through hole 814 is communicated with fuel conductor 821, the other end and pressure control cavity 33 Be communicated with.

Second plate 82 is placed in the opposition side of spray-hole 11 with respect to first plate 81, and End place that is positioned at spray-hole 11 opposition sides on fuel conductor 821 is provided with one and cuts Door 822. Fuel conductor 821 is provided with one at the end place that it is positioned at magnetic valve 40 1 sides Opening. A valve seat 82a props up against magnetic valve 40 on this valve seat around the opening setting, As shown in Figure 2.

Magnetic valve 40 is two-way valves, and it can turn round and interrupt pressure control cavity 33 And contacting between the low-pressure tube 401. Magnetic valve 40 is placed in being positioned on the valve body 30 One end place of spray-hole 11 opposition sides. Magnetic valve 40 is solid by a stop nut 41 Fix on the valve body 330.

As shown in Figures 1 to 3, magnetic valve 40 is mainly by a fixed magnetic core 42, valve member 50, armature 60 and a fixture 70 that consists of movable part forms.

Fixed magnetic core 42 surrounds a coil 43 that is in the winding state. Electric current passes through A connector 44 is fed in the coil 44. Fixed magnetic core 42 is by ferrimagnet system Become. Fixed magnetic core 42 is provided with an inboard magnetic at its end face that is positioned at armature 60 1 sides Extremely surperficial 42a and an outside magnetic pole surfaces 42b. The area of inboard magnetic pole surfaces 42a Area greater than outside magnetic pole surfaces 42b. Inboard magnetic pole surfaces 42a and outside magnetic pole table Area ratio between the face 42b is in 1.0 to 2.0 scope.

Fixed magnetic core 42 is formed as substantial cylindrical. A spring 45 is arranged in fixing In the inner periphery of magnetic core 42. Spring 45 is pushed valve member 50 to second plate 82. An accent Pipe joint 46 is used for the thrust of regulating spring 45.

The armature 60 of being made by ferrimagnet is formed as disc. Armature 60 can The electromagnetic attraction that produces on the magnetic core 42 that is fixed is inhaled to fixed magnetic core 42.

Valve member 50 comprises the axle 51 and the spheroid that consists of contact that consist of axle spare 52. Axle 51 forms one with armature 60, and along with the motion of armature 60 together Move axially. Spheroid 52 can be revolved by the end that is positioned at armature 60 opposition sides on the axle 51 Keeping with turning to.

When armature 60 is created within electromagnetic attraction between fixed magnetic core 42 and the armature 60 Suction is during to fixed magnetic core 42 and since axle 51 and armature 60 these two by the ferromagnetism material The parts that material is made are formed as one, so axle 51 can be shifted to armature 60 solid Decide magnetic core 42.

As shown in Figure 4, armature 60 is provided with otch 61 at its excircle, and each is cut Mouth has respectively the given degree of depth and extends vertically. According to first embodiment, three Otch 61 is arranged with constant angular spacing. Also be provided with through hole 62 on the armature 60, they One between inboard magnetic pole surfaces 42a and outside magnetic pole surfaces 42b with fixed magnetic core 42 Surperficial opposed position on, namely surround facing to the magnetic core 42 that is fixed at one The position of coil 62 on axial break-through armature 60. Three through holes 62 are with between constant angle Every arranging in the circumferential direction of the circle.

The discharge that is formed for of otch 61 and through hole 62 is superimposed upon armature 60 and fixture 70 Between excess of fuel. In addition, otch 61 can limit because of electromagnetic attraction effectively In armature 60, produce vortex current.

In order effectively to discharge the fuel between armature 60 and the fixture 70, wish to form Many otch 61. Yet, along with the quantity of otch 61 increases the magnetic pole area of armature Can reduce, thereby weaken electromagnetic attraction between fixed magnetic core 42 and the armature 60. According to First embodiment, through hole 62 be used for easily discharging armature 60 and fixture 70 it Between fuel. Through hole 62 be located at coil 43 opposed the position that can not form magnetic circuit On, so the magnetic pole area of armature 60 can not reduce.

Spheroid 52 is cut away by the part, to have a flat 521. Because spheroid 52 End by axle 51 is rotatably keeping, so flat 521 is always with second The valve seat 82a maintenance face contact of plate 82. Along with armature 60 and axle 51 are shifted to fixedly magnetic Core 42, owing to fuel pressure acts on the flat surfaces 521 of spheroid 52, so ball Body 52 can be shifted to fixed magnetic core 42, to open opening.

Fixed base 70 is formed as substantial cylindrical, and the heart is provided with a through hole therein 71. An axle sleeve 72 press fit in the through hole 71, and axle 51 can be rotatable in axle sleeve Ground is mobile. Fixture 70 is made by nonmagnetic substance. Therefore, do not have magnetic flux from by Leak on the fixture 70, therefore in the magnetic circuit that fixed magnetic core 42 and armature 60 consist of Can cause because of coil 43 charging the time, resulting between fixed magnetic core 42 and the armature 60 Electromagnetic attraction increase.

Next distance B between armature 60 and the fixture 70 is described.

As shown in Figure 2, when spheroid 52 rested on valve seat 82a when upper, namely when valve cuts out, The surperficial 60a that is positioned at fixture 70 1 sides on the armature 60 and the position on the fixture 70 Distance B between the surperficial 70a of armature 60 1 sides be set to be positioned at one given In the scope. According to first embodiment, be limited to 5 μ m for the lower of set a distance, and the upper limit Be 60 μ m. With fixed magnetic core 42 opposed the area of armature 60, namely armature 60 On the area that is positioned at fixed magnetic core 42 1 sides be 150mm²。

The above-mentioned lower limit of explained later and the upper limit reason is set.

Fig. 5 shows with respect to the position of the various variation valve members 50 of distance B and at valve Namely stop after the shutdown command to coil 43 for the relation between the elapsed time behind the induced current.

If distance B is longer than 60 μ m, for example distance B is 100 μ m or 1000 μ m, As shown in Figure 5, valve member 50 can occur beating when valve cuts out. Beating of valve member 50 is Because the thrust of spring 45 promotes the axially reciprocating of the valve member 50 that valve member 50 causes, Thereby can high velocity impact second plate 82. Because high-speed motion is also at short notice for valve member 50 And impact second plate 82, so valve member 50 can be beated on second plate 82 repeatedly. Therefore, even be supplied to the electric current of coil 43 to be terminated and fixed magnetic core 42 and armature Electromagnetic attraction between 60 disappears, and the opening of second plate 82 can not be closed fully. Adopted in the situation of fuel injection device 1 of magnetic valve 40, when opening not exclusively closes When closing, the pressure in the pressure control cavity 33 can change, so that needle 20 moves. Therefore, Spray-hole 11 can not be closed fully by needle 20, thereby causes being supplied to coil 43 Electric current be terminated after the fuel injection can surpass preset time. Consequently, fuel exists Imperfect combustion in the internal combustion engine can have a negative impact to toxic emission.

According to first embodiment, between armature 60 and fixture 70, be provided with between one The crack is so that fuel can be got involved in the gap. When 52 of the spheroids of valve member 50 come to valve seat When 82a was upper, the fuel between armature 60 and fixture 70 was squeezed. Pressurized Fuel can namely point to fixed magnetic core 42 to upwards acting in Fig. 2 with 60 1 in armature Reaction force. The reaction force that armature 60 is subjected to is used for just coming to valve 50 of valve members Reduce the speed that valve member 50 moves with armature 60 before seat 82a is upper. Consequently, When 50 of valve members came on the valve seat 82a, the impact that valve member 50 is subjected to was alleviated, and And beating of valve member 50 is restricted.

When beating of valve member 50 is lower than the limit allowable shown in Figure 5, because because of valve member 50 Pressure in the pressure control cavity 33 of beating and causing changes very little and appears at the short time In, so needle 20 can not move, thereby can be in case fuel processed sprays exceeds to regularly Between. According to first embodiment, be limited to 60 μ m on the distance B.

Fig. 6 shows with respect to the position of the various variation valve members 50 of distance B and at valve Namely begin to coil 43 for the relation between the elapsed time behind the induced current after opening order.

Be shorter than in distance B in the situation of 60 μ m, beating of valve member 50 is restricted. Yet, if distance B is too short, for example when distance B is 3 μ m, as shown in Figure 6, The valve opening time can greatly be postponed. This delay is because being superimposed upon the table of armature 60 The adhesion of the fuel between the surperficial 70a of face 60a and fixture 70 causes.

The surperficial 60a of armature 60 and the surperficial 70a of fixture 70 are by smooth grinding. By Very little in distance B, though therefore valve member 50 driven lifting when valve is opened, Thereby the surperficial 60a and the 70a that are facing with each other on armature 60 and the fixture 70 have been expanded Between the space, but owing to exist between surperficial 60a and the 70a and to produce such the showing of negative pressure Resemble, the fuel that therefore flows in this space can not be servo-actuated. Like this, even begin to coil 43 supply to have produced electromagnetic attraction between induced current and fixed magnetic core 42 and the armature 60, but Before electromagnetic attraction became greater than the negative pressure that produces, armature 60 can not move, therefore The valve opening time can postpone.

In the fuel injection device 1 that magnetic valve 40 is housed, because valve opening time quilt Postpone, so the injecting time of fuel can postpone backward from the scheduled time. This will cause combustion The material imperfect combustion, thus the waste gas that causes internal combustion engine to be discharged is undesirable.

When distance B during for 5 μ m for example, as shown in Figure 6, same distance D is 3 μ m The time situation compare, the delay of valve opening time shortens, but same distance D is 1000 μ m The time situation compare, then change little. Therefore, in order to ensure the valve opening time allowable In time delay, wish that distance B is not less than 5 μ m.

As the result of above-mentioned investigation, distance B and jumping when valve cuts out have been shown among Fig. 7 Relation between moving and when valve is opened the pass between distance B and the delay of valve opening time System. As shown in Figure 7, distance B is arranged in the scope between bound, namely 5 μ m≤D≤60 μ m.

Next the method for adjustable range D is described.

In order to ensure valve opening time allowable and allowable the beating of valve member 50, must be accurately Adjustable range D. Valve member 50 is made of axle 51 and spheroid 52. Spheroid 52 is along valve member 50 Axial height be positioned at ± the manufacturing dimension tolerance of 15 μ m. Equally, add by machine Worker or cold forging and the axial length of armature 60 that moulding is integrated and axle 51 also be positioned at ± and 15 In the manufacturing dimension tolerance of μ m. Monoblock type unit at a plurality of formation armature 60 and axle 51 In part and a plurality of spheroid 52, any one

integral element

60 and 51 and any one Spheroid 52 is optionally fitted together, so that their axial length is positioned at is given In the scope.

In addition, fixture 70 has and valve member 50 similar manufacturing dimension tolerances. Axially The fixture 70 that length has been selected is fitted together with valve member 50, with distance B Be set to the value in the preset range.

In addition, can make fixture 70 by two elements, each element is shaped to respectively Plate shape. The thickness of plate shape element is optionally combined, so that the axle of fixture Adjustable to length.

Next the operation of the fuel injection device that magnetic valve 40 is housed is described.

When coil 43 is not switched on, armature 60 and axle 51 by the thrust of spring 45 along Downward direction among Fig. 1 promotes. Therefore, spheroid 52 rests on the valve seat of second plate 82 On the 82a, so that be formed on pipe valve 822 in the fuel conductor 821 in spheroid 52 1 sides Opening is closed.

A part is carried also by fuel under high pressure conduit 341 from the fuel of common rail supply Be stored in the fuel tank 12, another part fuel is by fuel under high pressure conduit 342, fuel Conduit 811, fuel bath 813 and through hole 814 are carried and are stored in the pressure control cavity 33. Because the end of fuel conductor 821 is closed by spheroid 52, so in the pressure control cavity 33 Fuel pressure equal to be gathered in the pressure of the fuel in the common rail.

Like this, due to the fuel pressure in the pressure control cavity 33, close along spray-hole 11 Directive effect on needle 20 thrust and the thrust sum of spring 351 greater than because of fuel In the pond 12 and near the due to pressure of the fuel the valve seat 13 open direction along spray-hole 11 Act on the power on the needle 20. Therefore, the contact portion 24 of needle 20 rests on valve On the seat 13, closing spray-hole 11, thereby fuel can not spray from spray-hole 11.

After coil 43 was energized, armature 60 and axle 51 were created within fixed magnetic core 42 And the electromagnetic attraction between the armature 60 is inhaled to fixed magnetic core 42. When electromagnetic attraction becomes big When the thrust of spring 45, armature 60 and axle 51 will be shifted to fixed magnetic core 42. Like this, Spheroid 52 can act on the flat surfaces 521 because of the fuel pressure in the pressure control cavity 33 And move the 82a so that spheroid 52 is lifted off a seat along the upward direction among Fig. 2. Therefore, Pressure control cavity 33 is communicated with low-pressure tube 401, so that the height in the pressure control cavity 33 Pressurized fuel flows out and enters in the low-pressure tube 401.

Along with fuel under high pressure flows out and enters in the low-pressure tube 401 pressure control cavity 33 In fuel pressure can reduce so that act on needle 20 along spray-hole 11 closing directions On power reduce. When the power that acts on the needle 20 along spray-hole 11 closing directions becomes Less than because of in the fuel tank 12 and near the due to pressure of the fuel the valve seat 13 along spray-hole 11 When opening the power of directive effect on needle 20, needle 20 will be in Fig. 1 upwards The direction lifting opening spray-hole 11, thereby sprays fuel from spray-hole 11.

Behind the current stops that is fed to coil 43, armature 60, axle 51 and spheroid 52 Can under the thrust of spring 45, move along the downward direction among Fig. 1. Along with spheroid 52 Flat surfaces 521 rest on the valve seat 82a, flow into low pressure from pressure control cavity 33 The fuel of conduit 401 is interrupted. Fuel stops to flow to low-pressure tube 401 will cause pressure Fuel pressure in the control chamber raises, and acts on thereby make along spray-hole 11 closing directions Power on the needle 20 increases. When acting on the needle 20 along spray-hole 11 closing directions Power become when opening the power of direction along spray-hole 11 contact portion of needle 20 24 will rest on the valve seat 13, closing spray-hole 11, thereby stop from spray-hole 11 Burner oil.

In the magnetic valve 40 according to first embodiment, the distance B quilt when valve cuts out Be set to a value in 5 μ m to 60 mu m ranges. Because the upper limit of distance B is 60 μ m, therefore be superimposed upon on armature 60 and the fixture 70 surface opposite each other it Between fuel can be used for alleviate rushing of when 50 of valve members come on second plate 82, causing Hit, so that beating of valve member 50 is limited. Not to resemble the traditional electrical magnet valve valve Part 50 is configured to two elements, so the compact conformation of valve member 50.

Because the lower limit of distance B is 5 μ m, therefore because of armature 60 and fixture 70 it Between have fuel or negative pressure and the adhesion less that causes. Like this, open life at valve After the order, namely in beginning to coil 43 for behind the induced currents, during valve member 50 motion actuated Between can not postpone too many.

According to first embodiment, armature 60 is provided with otch 61 and through hole 62. Otch 61 and through hole 62 be used for discharging the fuel that is superimposed upon between armature 60 and the fixture 70. Like this, the fuel that is superimposed upon between armature 60 and the fixture 70 can not be extruded to very high Pressure, so valve member 50 can move stably. In addition, otch 61 can prevent Produce vortex current in the armature 60. In addition, because through hole 62 is placed in fixed magnetic core 42 Interior outside magnetic pole surfaces 42a and 42b between, namely be positioned at armature 60 facing to coil 43 The position on, so the magnetic pole area of electromagnetic attraction effect can not reduce, so electromagnetism draws Power can not reduce, and fuel oil can easily be discharged by through hole 62 simultaneously.

According to first embodiment, fixture 70 is made by nonmagnetic substance. Even rank The axial length of iron 60 or thickness are short or thinner, also can suppress magnetic flux to fixture 70 Leak, thereby so that the electromagnetic attraction between fixed magnetic core 42 and the armature 60 is not subjected to negative Impact. In addition, because inboard magnetic pole surfaces 42a and the outside magnetic pole of fixed magnetic core 42 Area ratio between the 42b of surface is set to the arbitrary value in 1 to 2 scope, so from The magnetic flux that inboard magnetic pole surfaces 42a flows out can be stopped at magnetic pole surfaces 42b place, the outside, So the electromagnetic attraction between fixed magnetic core 42 and the armature 60 can increase.

According to first embodiment, consist of armature 60 and the axle 51 of valve member 50 parts Be shaped to one. Like this, since do not need between armature 60 and the axle 51 by weld or Use other elements and link to each other, so the weight less of armature 60 and axle 51. By Namely be enough to armature 60 is inhaled to fixed magnetic core 42 in littler electromagnetic attraction, therefore fixing Magnetic core 42 or coil 43 become lighter and compacter, and the current drain of coil 43 Littler.

In addition, measuring combination, the spheroid 52 that is consisted of by armature 60 and axle 51 These have the corresponding axial length of the element of corresponding manufacturing dimension tolerance with fixture 70 After, any one combination and any one spheroid 52 are optionally assembled, Forming the assembled unit of armature 60 and valve member 50, thereby make total axon of assembled unit Be positioned at given range to length. Afterwards, any one fixture and any one combination The unit is optionally fitted together, so that distance B is positioned at 5 μ m to 60 μ m's In the scope. This manufacture method can be used for improving output, thereby reduces manufacturing cost.

As previously mentioned, beating of valve member 50 is restricted, so opening can be by in time Close. Therefore, there is not bad pressure to change in the pressure control cavity 33, and effect Thrust on needle 20 does not have disadvantageous changes. Like this, fuel can be in the scheduled time Outside time from spray-hole 11 ejection, and since the valve opening time of valve member 50 not Can postpone, so fuel can in time spray. (second embodiment)

The fuel that is used in of describing according to second embodiment below with reference to Fig. 8 and 9 sprays dress Magnetic valve in putting. Those basically to first embodiment in similar parts and element Represent with identical reference number, and no longer explain.

Structure and first according to the fixture 90 in the magnetic valve 40 of second embodiment Difference among the individual embodiment. Fixture 90 is by a fixture body 91 and a non-magnetic The property part 92 consist of, shown in Fig. 8 and 9. Fixture body 91 is by ferrous magnetic material Make, non-magnetic member 92 is made by nonmagnetic substance such as austenitic stainless steel or aluminium. This Outward, the axle sleeve that press fit in first embodiment in the through hole 71 is not used in for 72 this moments Be located in the through hole 93 at fixture 90 centers. Therefore, the axle 51 of valve member 50 directly with The inner surface sliding-contact of through hole 93.

Fixture body 91 is made by the relatively high material of yield point. Fixture body 91 Be difficult for plastic deformation, even fixture 90 is assembled on the valve body 30 with relative bigger power. First and

second plates

81 and 82 fixtures 90 are tried hard to recommend moving and extruding with bigger, from And also closely be superimposed upon second plate 82 on the valve body 30 so that first plate 81 is press fit over by rigidity On, to guarantee the realizing sealing of fluid-tight formula between two plates.

Nonmagnetic material 92 is placed in and is positioned at armature 60 1 sides on the fixture body 91 On one end. Non-magnetic member 92 is annular plates, and one of them endoporus has consisted of logical The part in hole 93. Non-magnetic member 92 is embedded in the fixture body 91, so that fixing Part body 91 and non-magnetic member 92 end that is positioned at armature 60 1 sides on the two consists of Same flat surfaces. Therefore, distance and the rank between armature 60 and the fixture body 91 Iron 60 equates with distance between the non-magnetic member 92, thereby so that armature 60 with Distance between the fixture 90 is regulated easily. In addition, an end of fixture body 91 The neighboring is facing to armature 60, as shown in Figure 8, therefore, with the inner periphery of valve body 30 The outer circle wall area of the fixture body 91 of wall phase interlock is relatively large. Like this, namely Make fixture body 91 by strong fastening on valve body 30, produce in the fixture body 91 The stress of giving birth to also arrives yield point never. Non-magnetic member 92 is by for example Laser Welding Connect, soldering, stack or be press-fitted and connecting fixture body 91. Let out for preventing magnetic flux It is about 1 to 3mm thick that the non-magnetic member 92 of leaking is formed as. Therefore, fixed magnetic core 42 And the magnetic flux that the magnetic circuit between the armature 60 produces leaks on the fixture 90 never. Although fixture body 91 is to be made by the magnetic material with high yield strength, Gu The electromagnetic attraction of deciding between magnetic core 42 and the armature 60 can not reduce, so 60 pairs in armature The responsiveness that is fed to the electric current in the coil 43 is very high.

As previously mentioned, fixture body 91 is connecting valve body 30 by powerful fastening force, And don't plastic deformation can occur, thereby first and

second plates

81 and 82 are pressed securely Join and be resisted against on the fixture 90. Like this, can highly guarantee valve body 30 and first and Fluid-tight formula sealing between two

plates

81 and 82, even therefore fuel pressure is very high, For example greater than 180MPa, between first plate 81 and the valve body 30 and first plate 81 with Fuel leakage between second plate 82 also can be suppressed be lived.

Not the feelings that consisted of fixture 90 by fixture body 91 and non-magnetic member 92 Under the condition, can use by nonmagnetic substance and make and have relatively consolidating of high yield strength Decide part 90. This fixture 90 have with second embodiment in describe identical excellent The point.

In addition, the application of magnetic valve 40 is not limited to previously described joint-track type fuel Injection apparatus, but can also be applied to such as other fuel such as Fuel Petroleum injection apparatus Injection apparatus can also be applied to device and and the system of any purposes.

Although armature 60 is 150mm at the surface area of fixed magnetic core 42 1 sides among the embodiment that describes in front², but size value of being not limited thereto of area.

Claims

1. solenoid valve, it is installed on the valve base piece (82), and valve base piece has the opening (821 and 822) and the valve seat around opening (82a) that are used to flow through fluid, and this solenoid valve has:

A valve member (50), it is used to rest on the valve seat or lifts off a seat, thereby opening is opened or closed;

A moving part (60), it moves axially with valve member;

A fixed magnetic core (42), it surrounds a coil (43), and when coil was recharged, the magnetic force that moving part is produced was inhaled to fixed magnetic core; And

A fixed block (70,90), its end face is mutually opposed with the end face that is positioned at the fixed magnetic core opposition side on the moving part, and another end face is characterized in that towards valve base piece:

When valve member is closed opening, distance D between the end face opposite each other on moving part and the fixed block is positioned at a prespecified range with lower limit and upper limit, thereby lower limit is set to such distance, promptly be recharged and moving part is prepared after beginning opens direction along opening and move at coil, the adhesive force that the motion actuated time of moving part can not be superimposed on the fluid between moving part and the fixed block significantly postpones, and the upper limit is set to such distance, promptly after coil blackout and just finish before the moving of opening closing direction at moving part, moving part can be from being superimposed upon the reaction force that fluid between moving part and the fixed block receive a sensing fixed magnetic core that increases suddenly.

2. solenoid valve according to claim 1 is characterized in that, the following 5 μ m that are limited to of distance D are limited to 60 μ m on the distance D.

3. solenoid valve according to claim 1 and 2 is characterized in that, at least one position integral body of moving part and valve member forms as one.

4. according to arbitrary described solenoid valve in the claim 1 to 3, it is characterized in that, behind the axial length of having measured a plurality of valve members and fixed block, any one valve member and any one fixed block are optionally assembled, so that distance D is positioned at the prespecified range with lower limit and upper limit.

5. according to arbitrary described solenoid valve in the claim 1 to 4, it is characterized in that valve member is made up of a contact member (52) and a shaft element (51), contact member is used to rest on valve seat, one end of shaft element is keeping contact member, and the other end combines with moving part.

6. solenoid valve according to claim 5, it is characterized in that, behind the axial length of having measured a plurality of contact members and shaft element respectively, any one contact member and any one shaft element are optionally assembled, so that distance D is positioned at the prespecified range with lower limit and upper limit.

7. according to arbitrary described solenoid valve in the claim 1 to 6, it is characterized in that fixed block is made up of the first and second different fixed blocks of axial length.

8. solenoid valve according to claim 7, it is characterized in that, behind the axial length of having measured a plurality of first and second fixed blocks respectively, any one first fixed block and any one second fixed block are optionally assembled, so that distance D is positioned at the prespecified range with lower limit and upper limit.

9. according to arbitrary described solenoid valve in the claim 1 to 8, it is characterized in that fixed block is made by a kind of material with given yield point value, this yield point reaches such degree, and promptly when the fixed block brute force was pushed valve base piece, fixed block can plastic deformation.

10. solenoid valve according to claim 9 is characterized in that, fixed block has a non magnetic element of being made by nonmagnetic substance.

11. solenoid valve according to claim 10 is characterized in that, the end place that be positioned at fixed magnetic core one side of non magnetic planning on fixed block.

12. solenoid valve according to claim 9 is characterized in that self is made fixed block by nonmagnetic substance.

13., it is characterized in that moving part is provided with otch (61) according to arbitrary described solenoid valve in the claim 1 to 12 on its excircle, each otch has given depth respectively and extends vertically.

14. according to arbitrary described solenoid valve in the claim 1 to 13, it is characterized in that, moving part is being provided with through hole (62) its one between inboard pole surface (42a) and the outside pole surface (42b) on the position of fixed magnetic core, the break-through vertically respectively of each through hole.

15. solenoid valve according to claim 14 is characterized in that, the area ratio of inboard pole surface and outside pole surface is positioned at 1 to 2 scope.

16. a fuel injection system, it has according to arbitrary described solenoid valve in the claim 1 to 15.

17. a fuel injection system, it has:

A nozzle body (10), it is provided with the spray-hole (11) that is used for burner oil;

A needle spare (20), it can turn round and open or close spray-hole;

A valve body (30), it has a pressure control cavity (33) that is used to store fuel under high pressure;

A control piston (32), it is slidably received within the valve body, and is promoted along the direction of closing spray-hole by the fuel pressure in the pressure control cavity; And

A control valve (40), the fuel pressure that it is used for the pilot pressure control chamber is characterized in that:

Control valve is according to arbitrary described solenoid valve in the claim 1 to 15.