CN104612876B - Fuel injector and there is its automobile - Google Patents

Abstract

The invention provides a kind of fuel injector and have its automobile, fuel injector includes：Oil injector body, is provided with the first installation cavity and the first oil duct being spaced apart with the first installation cavity in oil injector body；Needle-valve body, needle-valve body is connected to the lower end of oil injector body, is provided with the second installation cavity and the second oil duct in needle-valve body, and the bottom of needle-valve body is provided with multiple the first spray orifices with the second installation cavity conducting and the second spray orifice, and the size of the first spray orifice and the second spray orifice is different；Oil nozzle, oil nozzle is located at the lower end of the second installation cavity, and oil nozzle is provided with the 3rd oil duct, the 3rd installation cavity and the 4th installation cavity, multiple 5th oil duct and multiple 6th oil duct；Needle-valve, needle-valve is movably arranged at the first installation cavity, the second installation cavity, the 3rd installation cavity and the 4th installation intracavity along the vertical direction between primary importance, the second position and the 3rd position.Fuel injector according to embodiments of the present invention can reach not oil spout or various sizes of spray orifice oil spout according to different operating modes, reaches the most of operating point taking into account electromotor.

Description

Fuel injector and there is its automobile

Technical field

The present invention relates to automobile technical field, particularly to a kind of fuel injector and the automobile with it.

Background technology

With the continuous growth of automobile pollution, environment deteriorates increasingly, and especially haze weather frequently occurs in the recent period, automobile Industry is for the requirement also more and more higher of discharge and oil consumption.Automobile emission regulation gradually adds sternly in recent years, for oil consumption level Put into effect special laws and regulations requirement, just the discharge to automobile and oil consumption level propose tightened up requirement, diesel engine fuel injecting for this The aperture of device is the important parameter of impact discharge and oil consumption, the selection in fuel injector aperture it is critical that.

At present, the level close to Φ 0.1mm can be accomplished in the aperture of diesel injector, coordinates the injection pressure of superelevation, Good atomizing effect can be realized, optimize burning, reduce discharge and oil consumption.

In the development process of diesel engine, need to carry out the scheme to determine oil nozzle for the special oil nozzle type Selection Test, including The parameters such as spraying vertebra angle, aperture.Need comprehensive multiple operating mode multiple parameters when determining oil nozzle scheme, to select the side of optimum Case, generally requires during selection to accept or reject, therefore cannot take into account all of operating mode.

Fuel injector aperture is the important parameter having influence on engine emission and oil consumption, needs in the development process of electromotor Carry out special oil nozzle type Selection Test to determine aperture.Oil nozzle type selecting needs the discharge of comprehensive multiple operating points (at least 6), oil Consumption to determine oil nozzle scheme with noise level, including the spraying vertebra angle of oil nozzle, aperture etc..

Need first to consider discharge, oil consumption and the noise level of each operating mode when determining oil nozzle scheme, select preferably square Case, more comprehensively multiple operating modes are selected, and are often difficult to accept or reject it is impossible to take into account all of operating mode during selecting, than Load as big in the high speed of diesel engine, the performance that the oil nozzle of large aperture big flow is showed can be quite a lot of, but in low speed Smaller load, little The performance of the oil nozzle performance of aperture low discharge will be quite a lot of, no matter select which kind of oil nozzle certainly will cannot take into account all of operating mode, no Method makes electromotor reach discharge and the oil consumption of optimum.

In addition, realize moving up and down of needle-valve, needle-valve upper and lower ends more than traditional electric-controlled fuel injector using hydraulic system Respectively there is a pressure chamber, one pressure downwardly and upwardly of needle-valve is given in two-way pressure chamber respectively.During electromagnetic valve no power, needle-valve is subject to It is more than lower end pressure to upper end pressure, be pressed on inside needle-valve body in the presence of two-way pressure difference, high pressure fuel is closed in Outside oil nozzle pressure chamber, not oil spout；During solenoid valves, armature is subject to electromagnetic force upwards, starts up, end pressure on needle-valve Chamber is opened, and starts pressure release, and under needle-valve, end pressure is more than upper end pressure, and needle-valve starts up, height in the presence of two-way pressure difference Compression ignition oil enters oil nozzle pressure chamber, by oil injector hole commencement of fuel injection.

Because the injection pressure of diesel engine is high, response is fast, and operating frequency is high, along with domestic fuel qualities are poor, internal Containing various impurity, needle-valve and armature move in high pressure fuel medium-high frequency, and abrasion meeting ratio is more serious, can reduce oil spout after abrasion The oil spout precision of device, so that deterioration of emission, oil consumption rising；

Also often there is the problem of armature clamping stagnation in fuel injector, after armature clamping stagnation, needle-valve upper end pressure chamber cannot seal, needle-valve Lower end pressure is more than upper end pressure always, can keep the state of long oil spout, makes electromotor serious fault.

Content of the invention

In view of this, it is contemplated that proposing a kind of fuel injector, to solve the problems, such as that nozzle cannot take into account multiple operating modes.

For reaching above-mentioned purpose, the technical scheme is that and be achieved in that：

A kind of fuel injector, including：Oil injector body, be provided with described oil injector body along its axially extended first installation cavity and The first oil duct being spaced apart with described first installation cavity；Needle-valve body, described needle-valve body is connected to the lower end of described oil injector body, institute State and in needle-valve body, be provided with the second installation cavity and the second oil duct, described second oil duct is connected with described first oil duct, described second peace It behave affectedly and be spaced apart with described second oil duct and connect with described first installation cavity, the bottom of described needle-valve body is provided with multiple and described First spray orifice of the second installation cavity conducting and the second spray orifice, described first spray orifice is different with the size of described second spray orifice；Oil nozzle, Described oil nozzle is located at the lower end of described second installation cavity, and described oil nozzle is provided with the 3rd oil duct, the 3rd installation cavity and the 4th installation cavity, Described 3rd oil duct is connected with described second oil duct, and described 3rd installation cavity is led with described second installation cavity and described 3rd oil duct Logical, described 4th installation cavity is additionally provided with many with what described 4th installation cavity turned on described 3rd installation cavity conducting, described oil nozzle Individual 5th oil duct and multiple 6th oil ducts with described 3rd installation cavity conducting, multiple described 5th oil ducts are described with multiple respectively First spray orifice connection, multiple described 6th oil ducts are turned on multiple described second spray orifices respectively；Needle-valve, described needle-valve vertically side To be movably arranged between primary importance, the second position and the 3rd position described first installation cavity, described second installation cavity, Described 3rd installation cavity and described 4th installation intracavity, described needle-valve is provided with the 4th oil with described 4th installation cavity conducting Road, described needle-valve be located at described primary importance when, described 3rd oil duct respectively with described 3rd installation cavity and described 4th oil duct Disconnect；When described needle-valve is located at the described second position, described needle-valve disconnects described 3rd oil duct and described 3rd installation cavity and institute State the 3rd oil duct and described 4th oil duct conducting；When described needle-valve is located at described three position, described 3rd oil duct and described the Four oil ducts disconnect and described 3rd oil duct and described 3rd installation cavity conducting.

Further, described oil nozzle is formed generally as column, and described 3rd installation cavity is located at the top of described oil nozzle, described 3rd installation cavity along described oil nozzle radially extend and described 3rd installation cavity open upper end with described second installation cavity conducting, Described 3rd oil duct is located on the side wall of described oil nozzle and is turned on described 3rd installation cavity, and described 4th installation cavity is located at described The bottom of oil nozzle, the opened upper end of described 4th installation cavity and described 3rd installation cavity conducting, the radial direction of described 4th installation cavity It is smaller in size than the radial dimension of described 3rd installation cavity, described needle-valve includes body and is located at the boss of the lower end of described body, The outside wall surface of described body only supports the internal face of described 3rd installation cavity, and the outside wall surface of described boss only supports described 4th installation cavity Internal face, the outside wall surface conducting of one end of described 4th oil duct and described body, the other end of described 4th oil duct with described The lower surface conducting of boss.

Further, described 3rd installation cavity and described 4th installation cavity are coaxially disposed, described first spray orifice and described Two spray orifices are respectively provided at the lower end of described needle-valve body.

Further, described first spray orifice and described second spray orifice are respectively along the circumferentially spaced setting of described needle-valve body.

Further, described 4th oil duct is included along axially extended first duct of described needle-valve with along described needle-valve The second duct radially extending, the open at one end in described second duct and towards described 3rd oil duct, described second duct another One end is connected with the one end in described first duct, and the other end in described first duct extends to the lower surface of described boss.

Further, also include：Electromagnetic valve, described electromagnetic valve be located in described oil injector body and be connected with described needle-valve with Drive described needle-valve movable in the vertical direction.

Further, the periphery wall of described needle-valve is provided with and radially outward extends flange, described oil injector body upper Portion is provided with the interior protuberance extending radially inwardly along described first installation cavity, and described fuel injector also includes：First spring and second Spring, described first spring and described second spring are respectively provided at described first installation intracavity, and the two ends of described first spring are divided Described flange and described interior protuberance Zhi not supported, the two ends of described second spring only support described flange and described needle-valve body respectively.

Further, the radial dimension of the upper and lower of described needle-valve is respectively smaller than the radial dimension at middle part, described pin The top of valve is formed with the circumferentially extending upper annular groove along described needle-valve, and the bottom of described needle-valve is formed with the week along described needle-valve To the lower annular groove extending,

Described fuel injector also includes：Upper guide, described upper guide is located at described first and installs intracavity and be located at described The periphery of needle-valve, the lower end of described upper guide is only supported in the upper end of described first spring, and the top of described upper guide is provided with edge It extends radially inwardly to the first stopper section in described upper annular groove, and the bottom of described upper guide is provided with radially to extension Extend the second stopper section of the internal diameter size exceeding described interior protuberance；Lower guide, described lower guide is located at described second peace Behave affectedly periphery that is interior and being located at described needle-valve, the upper end of described lower guide is only supported in the lower end of described second spring, described under lead It is provided with the 3rd stopper section radially extending out to the internal diameter size exceeding described second installation cavity to the top of part, described The bottom of lower guide is provided with the 4th stopper section radially extending inwardly in described lower annular groove.

Further, the outer end of described 5th oil duct and the 6th oil duct is respectively equipped with radial dimension more than described 5th oil duct With the radial dimension of pressure chamber of the 6th oil duct, described pressure chamber be respectively turned on described 5th oil duct and described first spray orifice and Described 6th oil duct and described second spray orifice.

With respect to prior art, fuel injector of the present invention has the advantage that：

(1) fuel injector of the present invention, can reach not oil spout or various sizes of according to different duty requirements The effect of spray orifice oil spout, reaches and takes into account the most operating point of electromotor, optimizes burning, reduces overall discharge and oil consumption.

(2) this fuel injector structure is simple, easy to process, is easy to promote the use of.

Another object of the present invention is to proposing a kind of automobile, to solve the problems, such as that nozzle cannot take into account multiple operating modes.

For reaching above-mentioned purpose, the technical scheme is that and be achieved in that：

A kind of automobile, including fuel injector according to embodiments of the present invention.

Described automobile and above-mentioned fuel injector are had the advantage that identical with respect to prior art, will not be described here.

Brief description

The accompanying drawing constituting the part of the present invention is used for providing a further understanding of the present invention, the schematic reality of the present invention Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the structural representation of the fuel injector described in the embodiment of the present invention；

Fig. 2 is the part-structure enlarged diagram of the fuel injector described in the embodiment of the present invention；

Fig. 3 is the structural representation of the needle-valve of fuel injector described in the embodiment of the present invention；

Fig. 4 is the structural representation of the oil nozzle of fuel injector described in the embodiment of the present invention；

Fig. 5 is the structural representation of the spray orifice of the needle-valve body of fuel injector described in the embodiment of the present invention；

Fig. 6 is view during the not oil spout of fuel injector described in the embodiment of the present invention；

Fig. 7 is the view of the first spray orifice oil spout of fuel injector described in the embodiment of the present invention；

Fig. 8 is the view of the second spray orifice oil spout of fuel injector described in the embodiment of the present invention.

Description of reference numerals：

100- fuel injector,

1- oil injector body, 2- needle-valve body, 3- oil nozzle, 4- needle-valve, 5- electromagnetic valve, 6- first spring, 7- second spring, on 8- Guide, guide under 9-, tight cap of oil nozzle 10,

11- first oil duct, 12- first installation cavity, 13- interior protuberance,

21- second oil duct, 22- first spray orifice, 23- second spray orifice,

31- the 3rd oil duct, 32- the 3rd installation cavity, 33- the 4th installation cavity, 34- the 5th oil duct, 35- the 6th oil duct, 36- presses Power chamber,

41- the 4th oil duct, 411- first duct, 412- second duct, 42- body, 43- boss, 44- flange, the upper ring of 45- Groove, annular groove under 46-,

81- first stopper section, 82- second stopper section,

91- the 3rd stopper section, 92- the 4th stopper section, 93- the 7th oil duct.

Specific embodiment

It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phases Mutually combine.

To describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.

As shown in Figures 1 to 8, fuel injector 100 according to embodiments of the present invention includes oil injector body 1, needle-valve body 2, oil nozzle 3 With needle-valve 4.

It is provided with the first installation cavity 12 and the first oil duct 11, the first installation cavity 12 is along the axial direction of oil injector body 1 in oil injector body 1 Extend.First installation cavity 12 is spaced apart with the first oil duct 11.Needle-valve body 2 is connected to the lower end of oil injector body 1, sets in needle-valve body 2 There are the second installation cavity and the second oil duct 21, the second installation cavity is spaced apart with the second oil duct 21.Second oil duct 21 and the first oil duct 11 Connection, the second installation cavity is connected with the first installation cavity 12.The bottom of needle-valve body 2 is provided with multiple first spray orifices 22 and multiple second spray Hole 23.Each first spray orifice 22 and the second spray orifice 23 are turned on the second installation cavity respectively.

Oil nozzle 3 is located at the lower end of the second installation cavity.As shown in figure 4, oil nozzle 3 is provided with the 3rd oil duct 31, the 3rd installation cavity 32 With the 4th installation cavity 33.3rd oil duct 31 is connected with the second oil duct 21.When oil enters fuel injector 100, oil initially enters first Oil duct 11, then flows to the second oil duct 21, then flows to the 3rd oil duct 31.3rd installation cavity 32 and the conducting of the second installation cavity, simultaneously 3rd installation cavity 32 and the 3rd oil duct 31 turn on, and the 4th installation cavity 33 and the 3rd installation cavity 32 turn on.Oil nozzle 3 is additionally provided with multiple Five oil ducts 34 and multiple 6th oil duct 35, each the 5th oil duct 34 is turned on the 4th installation cavity 33 respectively, each the 6th oil duct 35 Turn on the 3rd installation cavity 32 respectively.

Multiple 5th oil ducts 34 are connected with multiple first spray orifices 22 respectively, and multiple 6th oil ducts 35 spray with multiple second respectively Hole 23 turns on.In other words, each the 5th oil duct 34 is connected with corresponding first spray orifice 22 respectively, each 35 points of the 6th oil duct Do not connect with corresponding second spray orifice 23.Wherein, the first spray orifice 22 is different with the size of the second spray orifice 23.As Fig. 6 to Fig. 8 Shown, needle-valve 4 is movably arranged at the first installation cavity along the vertical direction between primary importance, the second position and the 3rd position 12nd, in the second installation cavity, the 3rd installation cavity 32 and the 4th installation cavity 33.Needle-valve 4 is provided with the with the 4th installation cavity 33 conducting Four oil ducts 41.

Fig. 6 shows that needle-valve 4 is located at view during primary importance.As shown in fig. 6, when needle-valve 4 is located at first When putting, the 3rd oil duct 31 was both disconnected with the 3rd installation cavity 32, and disconnected with the 4th oil duct 41.Thus, the 3rd oil duct 31 and the 5th Oil duct 34 disconnects, and the 3rd oil duct 31 is also disconnected with the 6th oil duct 35 simultaneously so that the 3rd oil duct 31 both will not with needle-valve body 2 on The first spray orifice 22 turn on, and do not turn on the second spray orifice 23 on needle-valve body 2, so that the oil in the 3rd oil duct 31 both will not Spray from the first spray orifice 22, also will not spray from the second spray orifice 23, fuel injector 100 is in the state of not oil spout.

Fig. 7 shows that needle-valve 4 is located at the view during second position.As shown in fig. 7, when needle-valve 4 is located at second When putting, needle-valve 4 disconnects the 3rd oil duct 31 and the 3rd installation cavity 32, and meanwhile, the 3rd oil duct 31 and the 4th oil duct 41 turn on.Due to Four oil ducts 41 and the 4th installation cavity 33 turn on, and the 4th installation cavity 33 and the 5th oil duct 34 turn on, and therefore, the 3rd oil duct 31 can pass through 4th oil duct 41 and the 4th installation cavity 33 are turned on the 5th oil duct 34, and then the 3rd oil duct 31 can be turned on the first spray orifice 22, oil Can spray from the first spray orifice 22.Simultaneously as the 3rd oil duct 31 and the 3rd installation cavity 32 are disconnected by needle-valve 4, so that with the 3rd 5th oil duct 34 of installation cavity 32 connection can be disconnected with the 3rd oil duct 31, and the 3rd oil duct 31 is not connected with the second spray orifice 23, and second Spray orifice 23 not oil spout.

Fig. 8 shows that needle-valve 4 is located at view during three positions.As shown in figure 8, when needle-valve 4 is located at the 3rd When putting, the 3rd oil duct 31 and the 4th oil duct 41 disconnect, and the 3rd oil duct 31 and the 3rd installation cavity 32 turn on simultaneously.Due to the 5th oil duct 34 are connected with the 3rd oil duct 31 by the 4th oil duct 41, when the 3rd oil duct 31 and the 4th oil duct 41 disconnect, the 3rd oil duct 31 with 5th oil duct 34 disconnects, and thus, the 3rd oil duct 31 is disconnected with the first spray orifice 22, the first spray orifice 22 not oil spout.Simultaneously as the 3rd Oil duct 31 is turned on the 3rd installation cavity 32, so that can lead with the 3rd oil duct 31 with the 6th oil duct 35 of the 3rd installation cavity 32 conducting Logical, and then make to turn on the 3rd oil duct 31 with the second spray orifice 23 of the 6th oil duct 35 conducting, the second spray orifice 23 is in oil spout shape State.

In sum, when needle-valve 4 is from primary importance movement to the second position, fuel injector 100 can never oil spout state turn Change the state of the first spray orifice 22 oil spout into；When needle-valve 4 moves to three positions, fuel injector 100 is convertible into the second spray orifice 23 The state of oil spout.Thus, it is possible to by moving up and down the switching that needle-valve 4 realizes the oil spout state of fuel injector 100.Specifically, One of first spray orifice 22 and the second spray orifice 23 are macropore, and another is aperture.Fuel injector 100 can be according to residing operating mode Situation control macropore is fuel-displaced or aperture is fuel-displaced.For example, when machine is at a high speed under the operating mode of big load, needle-valve 4 is along upper Lower direction shift position, makes macropore oil spout；When machine is under the operating mode of low speed Smaller load, needle-valve 4 moves along the vertical direction Position, makes aperture oil spout.

Fuel injector 100 according to embodiments of the present invention, by different the first spray orifice 22 He of setting size on needle-valve body 2 Second spray orifice 23, and so that needle-valve 4 is movably moved between primary importance, the second position and the 3rd position along the vertical direction, from And make fuel injector 100 can reach not oil spout or the effect of various sizes of spray orifice oil spout according to different duty requirements, can To take into account the most operating point of electromotor, optimize burning, reduce overall discharge and oil consumption.

In other words, fuel injector 100 according to embodiments of the present invention, inside is provided with the different oil duct of two-way, and two-way oil duct divides Can not realizing being turned on or off according to operating mode, thus realizing fuel injector 100 not oil spout, or selecting different spray orifices to spray Oil, effectively solves the problems, such as that fuel injector 100 cannot take into account multiple operating modes.This fuel injector 100 structure is simple, easy to process, It is easy to promote the use of.

As shown in figure 4, oil nozzle 3 is formed generally as column, the 3rd installation cavity 32 is located at the top of oil nozzle 3, the 4th installation cavity 33 bottoms being located at oil nozzle 3, the 3rd oil duct 31 is located on the side wall of oil nozzle 3 and is turned on the 3rd installation cavity 32.3rd installation Chamber 32 radially extends along oil nozzle 3, and the open upper end of the 3rd installation cavity 32 and the second installation cavity realize conducting, the 4th installation The opened upper end in chamber 33 is turned on the 3rd installation cavity 32.Thus, the first installation cavity 12, the second installation cavity, the 3rd installation cavity 32 and 4th installation cavity 33 from top to bottom sequentially turns on, and makes needle-valve 4 can be plugged in the first installation cavity 12, the second installation cavity, the 3rd installation In chamber 32 and the 4th installation cavity 33.

As shown in figure 4, the radial dimension of the 4th installation cavity 33 is less than the radial dimension of the 3rd installation cavity 32, needle-valve 4 includes Body 42 and be located at body 42 lower end boss 43.The outside wall surface of the bottom of body 42 only supports the inwall of the 3rd installation cavity 32 Face, the outside wall surface of boss 43 only supports the internal face of the 4th installation cavity 33.One end of 4th oil duct 41 is led with the outside wall surface of body 42 Logical, the other end of the 4th oil duct 41 and the lower surface of boss 43 turn on simultaneously.

With reference to shown in Fig. 3, the 4th oil duct 41 includes the first duct 41 and the second duct 412.First duct 41 is along needle-valve 4 Axially extending.Second duct 412 radially extending along needle-valve 4.The open at one end in the second duct 412 and direction the 3rd oil duct 31.The other end in the second duct 412 is connected with the one end in the first duct 41, and the other end in the first duct 41 extends to boss 43 Lower surface.

With reference to shown in Fig. 6 to Fig. 8, the axial dimension of boss 43 is less than the axial dimension of the 4th installation cavity 33.Specifically, The level height of the lower surface of boss 43 is higher than the level height of the internal orifice of the 5th oil duct 34, during ensureing that needle-valve 4 moves up and down, The internal orifice of the 5th oil duct 34 will not be sealed by boss 43.

Alternatively, the 3rd installation cavity 32 and the 4th installation cavity 33 are coaxially disposed, and the first spray orifice 22 and the second spray orifice 23 are respectively It is located at the lower end of needle-valve body 2.Further, multiple first spray orifices 22 and multiple second spray orifice 23 respectively can be along needle-valve bodies 2 Circumferentially spaced setting.Preferably, multiple first spray orifices 22 are circumferentially spaced along needle-valve body 2 respectively with multiple second spray orifices 23 It is evenly arranged, multiple first spray orifices 22 and the alternate setting of multiple second spray orifice 23, between the first adjacent spray orifice 22 of any two It is provided with second spray orifice 23, between the second adjacent spray orifice 23 of any two, be provided with first spray orifice 22.

Alternatively, the outer end of the 5th oil duct 34 and the 6th oil duct 35 is respectively equipped with radial dimension and is more than the 5th oil duct 34 and the The radial dimension of pressure chamber 36 of six oil ducts 35, pressure chamber 36 is respectively turned on the 5th oil duct 34 and the first spray orifice 22 and the 6th oil Road 35 and the second spray orifice 23.That is, the outer end of the 5th oil duct 34 is provided with pressure chamber 36, the radial dimension of pressure chamber 36 is more than The radial dimension of the 5th oil duct 34, pressure chamber 36 is connected between the 5th oil duct 34 and the first spray orifice 22, make the 5th oil duct 34 with First spray orifice 22 conduction is good, and the first spray orifice 22 oil spout is smooth.Correspondingly, the 6th oil duct 35 outer end pressure can also be set Chamber 36, the radial dimension of pressure chamber 36 is more than the radial dimension of the 6th oil duct 35, and pressure chamber 36 is connected to the 6th oil duct 35 and the Between two spray orifices 23, make the second spray orifice 23 oil spout smooth.

As shown in figure 5, in an example of the present invention, the quantity of the first spray orifice 22 is six, the number of the second spray orifice 23 Amount is also six.12 spray orifices are distributed uniformly and circumferentially on needle-valve body 2,12 spray orifices are equally divided into two groups, two The spray cone angle of group spray orifice is identical, and aperture is different.Correspondingly, there are two kinds of oil ducts, 12 road altogether, 12 road oil inside oil nozzle 3 Road is uniformly distributed along the axle center of needle-valve 4.12 road oil ducts pass through 12 pressure chambers 36 of oil nozzle 3 outer surface, respectively with needle-valve The spray orifice of two groups of different pore sizes on body 2 is connected.

As shown in figure 1, fuel injector 100 also includes electromagnetic valve 5, electromagnetic valve 5 be located in oil injector body 1 and with needle-valve 4 phase Even, to drive needle-valve 4 movable in the vertical direction.As shown in figure 1, electromagnetic valve 5 includes solenoid setting up and down and lower electricity Magnet valve, can apply electromagnetic force upwards, needle-valve 4 can be applied after lower solenoid valves to needle-valve 4 after solenoid energising Downward electromagnetic force, can be controlled needle-valve 4 three positions by solenoid and lower electromagnetic valve, realize controlling in oil nozzle 3 Obstructed oil, or it is respectively communicated with the different oil duct of two-way, realize fuel injector 100 not oil spout, or select different spray orifices to spray Oil.Thus, under Different Work Condition of Engine, can be selected different by the energising situation of adjustment solenoid and lower electromagnetic valve Spray orifice carrys out oil spout.

Referring to figs. 1 to shown in Fig. 3, the top of oil injector body 1 is provided with interior protuberance 13, and interior protuberance 13 is located at the first installation cavity 12 Interior and extending radially inwardly along the first installation cavity 12.The periphery wall of needle-valve 4 is provided with flange 44, and flange 44 is along the footpath of needle-valve 4 To stretching out.Fuel injector 100 also includes the first spring 6 and second spring 7, and the first spring 6 and second spring 7 are respectively provided at In one installation cavity 12, the first spring 6 is located at the top of second spring 7.Flange 44, the first spring 6 are only supported in the lower end of the first spring 6 Upper end only support interior protuberance 13.Flange 44 is only supported in the upper end of second spring 7, and needle-valve body 2 is only supported in the lower end of second spring 7.

Thus, needle-valve 4 can instead of conventional fuel injector 100 and pass through liquid by two springs arranging up and down come action Pressure realizes the action of needle-valve 4, needle-valve 4 is not contacted with high pressure fuel, it is to avoid the fault that abrasion and clamping stagnation bring.

Specifically, when electromagnetic valve 5 no power, needle-valve 4 is balanced in primary importance by the effect of upper and lower two springs.As Shown in Fig. 6, the 3rd oil duct 31 and the 4th oil duct 41 separate, and the 3rd oil duct 31 is disconnected with the 5th oil duct 34, also with the 6th oil duct 35 disconnections.Now the oil duct on oil nozzle 3 is blocked it is impossible to realize oil spout by needle-valve 4.

During electromagnetic valve 5 energising instantly, needle-valve 4 is subject to downward electromagnetic force, and the stress balance of needle-valve 4 is destroyed, under starting OK, and stably in position as shown in Figure 7.As shown in fig. 7, the 3rd oil duct 31 and the 4th oil duct 41 turn on, the 5th oil duct 34 are turned on the 3rd oil duct 31 by the 4th oil duct 41, and the road binders road on oil nozzle 3 is in open mode, and oil sequentially passes through first Oil duct 11, the second oil duct 21, the 3rd oil duct 31, the 4th oil duct 41, the 4th installation cavity 33 and the 5th oil duct 34 enter pressure chamber 36, Then spray from the first spray orifice 22, a kind of oil spout state realized by fuel injector 100.

When solenoid is energized, needle-valve 4 is subject to electromagnetic force upwards, and the stress balance of needle-valve 4 is destroyed, start on OK, stablize as illustrated in figure 8 at positions after upper shifting certain distance.As shown in figure 8, the 3rd oil duct 31 and the 3rd installation cavity 32 are led Logical, the 6th oil duct 35 is turned on the 3rd oil duct 31 by the 3rd installation cavity 32, and now another road binders road on oil nozzle 3 is opened, Oil sequentially passes through the first oil duct 11, the second oil duct 21, the 3rd oil duct 31, the 3rd installation cavity 32 and the 5th oil duct 34, then from Two spray orifices 23 spray, and another kind of oil spout state realized by fuel injector 100.

As shown in figure 3, the radial dimension on needle-valve 4 top is less than the radial dimension at needle-valve 4 middle part, the radial direction of needle-valve 4 bottom Size is again smaller than the radial dimension at needle-valve 4 middle part.The top of needle-valve 4 is formed with the circumferentially extending upper annular groove 45 along needle-valve 4, pin The bottom of valve 4 is formed with the circumferentially extending lower annular groove 46 along needle-valve 4.Thus, the side of the side wall of upper annular groove 45 and lower annular groove 46 Wall can form a shaft shoulder respectively.

Shown in seeing figures.1.and.2, fuel injector 100 also includes guide 8 and lower guide 9.Upper guide 8 is located at In the one installation cavity 12 and periphery positioned at needle-valve 4.Lower guide 9 is located at the second installation intracavity and is located at the periphery of needle-valve 4. The lower end of upper guide 8 is only supported in the upper end of the first spring 6, and the upper end of lower guide 9 is only supported in the lower end of second spring 7.

The top of upper guide 8 is provided with the first stopper section 81, the first stopper section 81 extending radially inwardly along upper guide 8 In supreme annular groove 45.The bottom of upper guide 8 is provided with the second stopper section 82, the second stopper section 82 along upper guide 8 radial direction to Extend beyond outward the medial surface of interior protuberance 13.The top of lower guide 9 is provided with the 3rd stopper section 91, the 3rd stopper section 91 along under The medial surface extending radially outwardly to more than the second installation cavity of guide 9.The bottom of lower guide 9 is provided with the 4th stopper section 92, the 4th stopper section 92 is along along annular groove 46 under the extending radially inwardly to of lower guide 9.

When needle-valve 4 moves up, the shaft shoulder on needle-valve 4 top can encounter the first stopper section 81, and the first stopper section 81 can Limit needle-valve 4 to continue to move up.Likewise, when needle-valve 4 moves down, the shaft shoulder of needle-valve 4 bottom can encounter the 4th backstop Portion 92, the 4th stopper section 92 can limit needle-valve 4 and continue to move down.That is, upper guide 8 and lower guide 9 are permissible Limit the displacement that needle-valve 4 moves along the vertical direction.

Alternatively, as shown in Fig. 2 the 7th oil duct 93, the upper end and second of the 7th oil duct 93 can be provided with lower guide 9 Oil duct 21 connects, and the lower end of the 7th oil duct 93 is connected with the 3rd oil duct 31.High pressure fuel enters fuel injector 100 from oil injector body 1 Interior, enter into oil nozzle 3 through the first oil duct 11 on oil injector body 1, the second oil duct 21 on needle-valve body 2, the 7th oil duct 93 In 3rd oil duct 31.Wherein, the 7th oil duct 93 can be entirely formed as in lower guide 9 it is also possible to be formed at lower guide 9 with Between the mating surface of needle-valve body 2.

As shown in Fig. 2 fuel injector 100 also includes tight cap of oil nozzle 10, tight cap of oil nozzle 10 is set in needle-valve body 2 and oil injector body On 1, make the assembling structure of fuel injector 100 more solid and reliable, prevent oil leak.

In sum, fuel injector 100 according to embodiments of the present invention, internal structure employs various ways and achieves oil spout Device 100 can achieve different oil spout states under different operating modes.Specifically, employ the following new paragon：

(1) in oil nozzle 3 two-way difference oil duct mode；

(2) two springs arranged up and down coordinate electromagnetic valve 5 to control the mode that needle-valve 4 is opened；

(3) by way of needle-valve 4 is mobile to realize mutually switching between different oil ducts；

(4) oil nozzle 3 and needle-valve body 2 complement each other to form the mode of multiple independent oil ducts；

The spray orifice of (5) two kinds of different pore sizes switches to optimize the mode of burning condition according to operating mode；

In electromotor oil nozzle type selecting, the needs in the big load and low speed Smaller load aperture to oil nozzle are often different at a high speed, At a high speed during big load, power is high, and distributive value ratio is larger, and the fuel injector of small-bore just cannot meet the demand of flow；Low speed is little negative During lotus, fuel injector demand is relatively small, if still using wide-aperture oil nozzle, burning will be made to deteriorate, discharge and oil consumption raise. And the flexible switching between the spray orifice of different pore size that fuel injector 100 according to embodiments of the present invention can realize oil nozzle 3, use After the fuel injector 100 of this patent, the spray orifice of different pore size can be selected come oil spout by demarcating in different operating modes, can be effective Reduction discharge and oil consumption.

Meanwhile, fuel injector 100 according to embodiments of the present invention to realize needle-valve using upper and lower two springs cooperation electromagnetic valve 5 4 movement, the hydraulic system being adopted different from conventional fuel injector 100 to realize the movement of needle-valve 4, needle-valve 4 and controlling organization It is not directly contacted with high pressure fuel, it is to avoid the fault such as fuel injector 100 long oil spout that inordinate wear and clamping stagnation are brought.

Automobile according to embodiments of the present invention includes fuel injector 100 according to embodiments of the present invention.Due to according to the present invention The fuel injector 100 of embodiment has above-mentioned beneficial technique effect, and therefore, automobile according to embodiments of the present invention has multiple sprays Oil condition, can take into account the most operating point of electromotor, optimize burning, reduce overall discharge and oil consumption.

Other of fuel injector 100 according to embodiments of the present invention constitute and operate for those of ordinary skill in the art For be knowable, here is not described in detail.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.

Claims (10)

1. a kind of fuel injector, including：

Oil injector body, is provided with along its axially extended first installation cavity and is spaced with described first installation cavity in described oil injector body The first oil duct opened；

Needle-valve body, described needle-valve body is connected to the lower end of described oil injector body, is provided with the second installation cavity and in described needle-valve body Two oil ducts, described second oil duct is connected with described first oil duct, described second installation cavity be spaced apart with described second oil duct and with Described first installation cavity connection, the bottom of described needle-valve body is provided with first spray orifice and the of multiple and described second installation cavity conducting Two spray orifices, described first spray orifice is different with the size of described second spray orifice；It is characterized in that, also include：

Oil nozzle, described oil nozzle is located at the lower end of described second installation cavity, and described oil nozzle is provided with the 3rd oil duct, the 3rd installation cavity and Four installation cavitys, described 3rd oil duct is connected with described second oil duct, described 3rd installation cavity and described second installation cavity and described 3rd oil duct conducting, described 4th installation cavity is additionally provided with and described 4th installation with described 3rd installation cavity conducting, described oil nozzle Multiple 5th oil ducts of chamber conducting and multiple 6th oil ducts with described 3rd installation cavity conducting, multiple described 5th oil ducts are respectively Connect with multiple described first spray orifices, multiple described 6th oil ducts are turned on multiple described second spray orifices respectively；

Needle-valve, described needle-valve is movably arranged at described along the vertical direction between primary importance, the second position and the 3rd position First installation cavity, described second installation cavity, described 3rd installation cavity and described 4th installation intracavity, described needle-valve is provided with and institute State the 4th oil duct of the 4th installation cavity conducting,

Described needle-valve be located at described primary importance when, described 3rd oil duct respectively with described 3rd installation cavity and described 4th oil duct Disconnect；When described needle-valve is located at the described second position, described needle-valve disconnects described 3rd oil duct and described 3rd installation cavity and institute State the 3rd oil duct and described 4th oil duct conducting；When described needle-valve is located at described three position, described 3rd oil duct and described the Four oil ducts disconnect and described 3rd oil duct and described 3rd installation cavity conducting.

2. it is characterised in that described oil nozzle is formed generally as column, the described 3rd pacifies fuel injector according to claim 1 Behave affectedly and be located at the top of described oil nozzle, described 3rd installation cavity along described oil nozzle radially extend and described 3rd installation cavity upper End open wide with described second installation cavity conducting, described 3rd oil duct be located on the side wall of described oil nozzle and with described 3rd installation cavity Conducting,

Described 4th installation cavity is located at the bottom of described oil nozzle, the opened upper end of described 4th installation cavity and described 3rd installation cavity Conducting, the radial dimension of described 4th installation cavity is less than the radial dimension of described 3rd installation cavity, described needle-valve include body and It is located at the boss of the lower end of described body, the outside wall surface of described body only supports the internal face of described 3rd installation cavity, described boss Outside wall surface only support the internal face of described 4th installation cavity, one end of described 4th oil duct is turned on the outside wall surface of described body, The other end of described 4th oil duct is turned on the lower surface of described boss.

3. fuel injector according to claim 2 is it is characterised in that described 3rd installation cavity is coaxial with described 4th installation cavity Setting, described first spray orifice and described second spray orifice are respectively provided at the lower end of described needle-valve body.

4. fuel injector according to claim 3 is it is characterised in that described first spray orifice and described second spray orifice are respectively along institute State the circumferentially spaced setting of needle-valve body.

5. fuel injector according to claim 2 is it is characterised in that described 4th oil duct includes prolonging along the axial direction of described needle-valve The first duct stretched and the second duct radially extending along described needle-valve, the open at one end in described second duct and towards described 3rd oil duct, the other end in described second duct is connected with the one end in described first duct, and the other end in described first duct prolongs Extend the lower surface of described boss.

6. fuel injector according to claim 1 is it is characterised in that also include：Electromagnetic valve, described electromagnetic valve is located at described spray It is connected in oily body and with described needle-valve to drive described needle-valve movable in the vertical direction.

7. fuel injector according to claim 6 is it is characterised in that the periphery wall of described needle-valve is provided with radially to extension The flange stretched, the top of described oil injector body is provided with the interior protuberance extending radially inwardly along described first installation cavity,

Described fuel injector also includes：First spring and second spring, described first spring and described second spring are respectively provided at institute State the first installation intracavity, described flange and described interior protuberance are only supported respectively in the two ends of described first spring, described second spring Two ends only support described flange and described needle-valve body respectively.

8. fuel injector according to claim 7 is it is characterised in that the radial dimension of the upper and lower of described needle-valve is distinguished Less than the radial dimension at middle part, the top of described needle-valve is formed with the circumferentially extending upper annular groove along described needle-valve, described needle-valve Bottom be formed with circumferentially extending lower annular groove along described needle-valve,

Described fuel injector also includes：

Upper guide, described upper guide is located at described first and installs intracavity and be located at the periphery of described needle-valve, described first bullet The lower end of described upper guide is only supported in the upper end of spring, and the top of described upper guide is provided with and radially extends inwardly on described The first stopper section in annular groove, the bottom of described upper guide is provided with radially to extend out to and exceedes the interior of described interior protuberance Second stopper section of side；

Lower guide, described lower guide is located at described second and installs intracavity and be located at the periphery of described needle-valve, described second bullet The upper end of described lower guide is only supported in the lower end of spring, and the top of described lower guide is provided with radially to extend out to and exceedes institute State the 3rd stopper section of the medial surface of the second installation cavity, the bottom of described lower guide be provided with radially extend inwardly to described The 4th stopper section in lower annular groove.

9. the fuel injector according to any one of claim 1-8 is it is characterised in that described 5th oil duct and the 6th oil duct Outer end is respectively equipped with the radial dimension of pressure chamber that radial dimension is more than described 5th oil duct and the 6th oil duct, and described pressure chamber divides Do not turn on described 5th oil duct and described first spray orifice and described 6th oil duct and described second spray orifice.

10. a kind of automobile is it is characterised in that include the fuel injector any one of claim 1-9.