CN106286056B - Fuel injection nozzle - Google Patents
Fuel injection nozzle Download PDFInfo
- Publication number
- CN106286056B CN106286056B CN201610470844.1A CN201610470844A CN106286056B CN 106286056 B CN106286056 B CN 106286056B CN 201610470844 A CN201610470844 A CN 201610470844A CN 106286056 B CN106286056 B CN 106286056B
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- Prior art keywords
- needle
- piece
- fuel
- spray orifice
- lift amount
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1866—Valve seats or member ends having multiple cones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
Abstract
The fuel injection nozzle (1) that the present invention relates to a kind of for engine.Spray orifice (7) is circumferentially arranged, and respectively includes the entrance (31) being located on bag-shaped room (8) inner peripheral surface.Known: φ Dy is the injection diameter (φ D) of each spray orifice (7) along axial axial component；L0 is when needle-like piece (2) close fuel channel (13) from each entrance (31) center of spray orifice (17) to the axial distance of entire needle-like piece (2) end (17)；L is the lift amount of needle-like piece (2), when the lift amount (L) of needle-like piece (2) is less than preset threshold value, meet relationship │ L-L0 │ > φ Dy/2, and when the lift amount of needle-like piece (2) (L) is greater than the threshold value, meet relationship: │ L-L0 │≤φ Dy/2.
Description
Technical field
This disclosure relates to a kind of directly to the fuel injection nozzle of the combustion chamber of engine injection fuel.
Background technique
The fuel injection nozzle routinely suggested includes nozzle body and needle-like piece, and needle-like piece is contained in nozzle body (example
Such as, referring to JP2010-174819A).Nozzle body is arranged in the seat surface engaged or disengaged in cone and with the end of needle-like piece
On end side.The respective entrance of spray orifice is opened on the inner peripheral surface of bag-shaped room, these spray orifices are arranged on the end side of nozzle body.
Two circular conical surfaces that outer diameter is gradually reduced are formed in the end of needle-like piece.Above-mentioned fuel injection nozzle makes the end of needle-like piece
It is detached from from seat surface to inject fuel into combustion chamber, wherein fuel flows through bag-shaped room from the upstream of fuel channel and enters
In spray orifice.
For the diesel combustion of the air-fuel mixture self-ignition to fuel and air, it is desirable to reduce cooling
Loss and exhaust smoke level.In order to reduce cooling loss, needs to weaken fuel by the spray orifice of fuel injection nozzle and be ejected into combustion chamber
Spraying penetration power.Therefore, injected fuel spray cannot reach the wall surface of combustion chamber easily to reduce from combustion chamber wall surface to cooling
The thermal exposure of medium.Thus, it is possible to reduce the cooling loss of engine.In order to reduce exhaust smoke level, need to reinforce the spray of fuel
Mist penetration power.Therefore, injected fuel spray reaches farther, and thus the indoor air utilization ratio that burns is improved, so as to obtain
Obtain good combustion state.Therefore, exhaust smoke level can be reduced.
If the lift amount of needle-like piece is greater than threshold value, when spraying penetration power weakens, exhaust smoke level is intended to increase.If
The lift amount of needle-like piece is less than threshold value, then when spraying penetration power is reinforced, cooling loss is intended to increase.Therefore, when needle-like piece
When lift amount is greater than threshold value, spraying penetration power needs to reinforce, and when the lift amount of needle-like piece is less than threshold value, spraying penetration power needs
Weaken.
Summary of the invention
The disclosure at least one of solves the above problems.Therefore, a purpose of the disclosure is to provide a kind of fuel spray
Nozzle is penetrated, spraying penetration power can be reinforced when the lift amount of needle-like piece is greater than threshold value, and can be in the lift of needle-like piece
Amount weakens spraying penetration power when being less than threshold value.
In order to realize the purpose of the disclosure, a kind of fuel injection including nozzle body and needle-like piece for engine is provided
Nozzle.Nozzle body is tubular comprising multiple spray orifices, fuel channel, the seat surface of cone and bag-shaped room.Fuel passes through multiple sprays
Hole is ejected into the combustion chamber of engine.Fuel channel is formed in the upstream side of multiple spray orifices.Seat surface limits fuel channel.Bag
The downstream side of fuel channel is arranged in shape room.Multiple spray orifice circles are circumferentially comprising are located on bag-shaped indoor circumferential surface
Entrance.Needle-like piece is contained in nozzle body and is moved with the axial reciprocating along nozzle body, and needle-like piece includes annular seats and cone
End extension.Portions and seat surface are engaged or disengaged to close or open fuel channel.End extension is located at the downstream of portions
Side, and when portions are engaged with seat surface, the end extension point is positioned in bag-shaped room.It is assumed that: φ Dy is the multiple
Injection diameter in each of spray orifice is along axial axial component；L0 is when needle-like piece closes fuel channel from multiple spray orifices
Axial distance of the center in each of entrance to entire needle-like piece end；L is the lift amount of needle-like piece, when the lift of needle-like piece
Amount meets relationship when being less than preset threshold value: │ L-L0 │ > φ Dy/2 meets when the lift amount of needle-like piece is greater than the threshold value and closes
System: │ L-L0 │≤φ Dy/2.
Detailed description of the invention
From detailed description with reference to the accompanying drawings, above and other objects, features, and advantages of the present disclosure will become more
Add intuitive.In the accompanying drawings:
Fig. 1 is the sectional view for showing the fuel injection nozzle according to an embodiment；
Fig. 2 is the figure for showing the major part of fuel injection nozzle of the embodiment；
Fig. 3 is the figure for showing the major part of fuel injection nozzle of the embodiment；
Fig. 4 A is to schematically show fuel according to this embodiment in the sectional view of bag-shaped room flow situation；
Fig. 4 B is to schematically show fuel according to this embodiment in the sectional view of bag-shaped room flow situation；
Fig. 5 is the figure for showing the threshold value for needle-like piece lift amount according to this embodiment；
Fig. 6 is the figure for showing the threshold value for needle-like piece lift amount according to this embodiment；
Fig. 7 is the figure for showing the threshold value for needle-like piece lift amount according to this embodiment；
Fig. 8 is to show the timing diagram changed from the jet angle of fuel injection nozzle injection fuel according to this embodiment.
Specific embodiment
Description embodiment that hereinafter reference will be made to the drawings.
It is explained below the structure of the fuel injection nozzle of embodiment.Fig. 1 to Fig. 8 shows embodiment of the disclosure.This
The fuel injection valve of embodiment is contoured to correspond in each cylinder of the engine for making the vehicle of such as automotive-type advance.It adopts
Use diesel engine with direct injection as the engine.
Fuel injection valve comprises direct fuel injection into the fuel injection nozzle 1 in the combustion chamber of engine.Fuel spray
Penetrating nozzle 1 includes the needle-like piece 2 and the nozzle body 3 with cylinder shape for accommodating the needle-like piece 2 along its axially reciprocating.Needle
Shape part 2 includes the end extension 6 of cylindrical main part 4, the portions 5 of annular and cone.The motive force of reset spring is applied
Add to the needle-like piece 2.Nozzle body 3 includes spray orifice 7 and bag-shaped room 8.Spray orifice 7 and bag-shaped room 8 are arranged in 3 one end of nozzle body
At pouch portions 9.The seat surface 10 that can engage with portions 5 is set to be used for nozzle body 3.Fuel storage cell 12 is arranged in nozzle body
In 3, wherein high pressure fuel introduces the fuel by teasehole 11 from the high pressure generating means of such as supply pump or common rail etc
In storage room 12.
Bag-shaped room 8 is located at the downstream side of fuel channel 13.The bag-shaped room 8 is distributor chamber, will pass through 13 ring of fuel channel
The fuel of shape flowing is fused together and temporarily stores these fuel, then fuel is uniformly distributed and is supplied to spray orifice 7.Bag
The inner peripheral surface of shape room 8 includes the cylindrical periphery wall surface centered on the axis of nozzle body 3, and with the bag on 3 axis of nozzle body
Spherical bottom wall surface centered on center.Seat surface 10 is cone, and internal diameter is gradually reduced towards end side.Drive needle-like piece 2
It is connect with opening the actuator of valve with nozzle body 3.Using solenoid actuator or piezo actuator as the actuator.It omits
Description to reset spring and actuator.
The seat surface 10 of needle-like piece 2 and nozzle body 3 engage or disengage with close or open be located at 7 upstream side of spray orifice fuel it is logical
Road 13.Main part 4 is supported by the pilot hole 14 of nozzle body 3, so as to reciprocatingly slide on pilot hole 14.Main part 4 includes
The outer peripheral surface of fuel channel 13 is limited between main part 4 and nozzle body 3.It is formed in the end of main part 4 in circular cone
The inclined-plane 15 that shape, its outer diameter are gradually reduced towards end side.Portions 5 be formed in inclined-plane 15 and end extension 6 circular conical surface 16 it
Between.As shown in Fig. 2, the seat diameter of portions 5 is φ d.
End extension 6 has the coniform shape centered on its axis.When portions 5 are engaged with seat surface 10, the end
End extension 6 is located in bag-shaped room 8.End extension 6 is stretched out from portions 5 towards the end side of needle-like piece 2.End extension 6
End 17 is equivalent to the end of entire needle-like piece, and it is configured to undercutting component, for preventing the bottom wall table with bag-shaped room 8
Face interference.The end 17 is flat surface, has the circular shape using the axis of needle-like piece 2 as its center.End extension 6
The end 17 can be the vertex of circular conical surface.Fuel channel 13 is formed between needle-like piece 2 and seat surface 10, and is formed in needle-shaped
Between part 2 and the inner peripheral surface of nozzle body 3.Fuel channel 13 is located at the upstream side of bag-shaped room 8.Fuel channel 13 is located at fuel storage
The downstream side of room 12.
In fuel injection nozzle 1, when portions 5 are engaged with seat surface 10, fuel channel 13 is closed.Therefore, fuel will not
It is ejected into combustion chamber by spray orifice 7.In fuel injection nozzle 1, when portions 5 rise from seat surface 10, fuel channel 13 is beaten
It opens.Therefore, fuel is introduced into the bag-shaped room 8 being connected to spray orifice 7 from fuel channel 13.To which fuel is sprayed by spray orifice 7
Into combustion chamber.In fuel injection nozzle 1, when needle-like piece 2 starts to be promoted, needle-like piece passes through low promotion period LS and Gao Ti
It rises period LL and is moved upwards up to complete raised position.Therefore, needle-shaped in entire fuel injection period in fuel injection nozzle 1
The lift amount of part 2 changes from fully closed position to complete raised position.Low promotion period LS is the fuel in small lift amount
Injection timing, thus the lift amount of needle-like piece 2 is less than threshold value.When high promotion period LL is the fuel injection in high-lift amount
Phase, thus the lift amount of needle-like piece 2 is greater than threshold value.
The feature of the fuel injection nozzle of the present embodiment is described below.Spray orifice 7 has the bag-shaped of bottom in cylindrical
Part 9 it is inside and outside between be connected to.For example, 6 to 12 spray orifices 7 can be set.In the present embodiment, 10 sprays are provided with
Hole 7.The axis of nozzle body 3 is referred to as nozzle-axis Y.The axis of each spray orifice 7 is referred to as spray orifice axis HL.Spray orifice 7 is set as radial
Extend outwardly, with the predetermined position on nozzle-axis Y for its center.These spray orifices 7 are formed at regular intervals in circumferencial direction,
To which injected fuel spray F1, F2 are effectively dispersed in each combustion chamber.All spray orifices 7 are all having the same to be clipped in spray orifice axis
Angle between HL and nozzle-axis Y.All spray orifices 7 injection diameter all having the same and identical ejection orifice channels length.
Each spray orifice 7 is included in the spray orifice entrance 31 of the inner peripheral surface upper opening of pouch portions 9 and in the outer of pouch portions 9
The spray orifice outlet 32 of circumferential surface upper opening.Each spray orifice 7 is straight spray orifice, and aisle spare is exported from spray orifice entrance 31 to spray orifice
32 do not change.In Fig. 2 to Fig. 4 B, each spray orifice 7 is predetermined both relative to the inclination radially downward one perpendicular to nozzle-axis Y
Angle.The center of each spray orifice entrance 31 is formed on the boundary between the perpendicular wall surfaces and bottom wall surface of bag-shaped room 8.Bag
Shape room 8 includes the entrance side opening at crestal line 31, and crestal line described here is annular, is formed in the downstream of seat surface 10.It is bag-shaped
Spatial volume in room 8 changes according to the lift amount of needle-like piece 2.Specifically, when needle-like piece 2 is promoted in the upward direction,
The spatial volume of bag-shaped room 8 becomes larger.
Time when the lift amount of needle-like piece 2 is less than threshold value is referred to as the low promotion time of needle-like piece 2.It is formed in seat surface
The aisle spare around portions 5 between 10 and portions 5 is referred to as seat aisle spare α.The summation of the aisle spare of spray orifice 7 is claimed
Make spray orifice overall channel area β.Fuel injection nozzle 1 is constructed such that be formed in seat surface 10 in the low promotion time of needle-like piece 2
Seat aisle spare α between portions 5 is less than spray orifice overall channel area β, and wherein spray orifice overall channel area β is the channel of spray orifice 7
The summation of area.Seat aisle spare α is to be formed in nozzle body 3 in the low promotion time of needle-like piece 2 through entire fuel injection
Fuel channel in smallest passage area MA.
Time when the lift amount of needle-like piece 2 is greater than threshold value is referred to as the high of needle-like piece 2 and promotes the time.Fuel injection spray
Mouth 1 is constructed such that be greater than spray orifice overall channel area β in the high time seat aisle spare α that promoted of needle-like piece 2.Spray orifice overall channel
Area β is to promote the time through the smallest passage area MA of entire fuel injection in the high of needle-like piece 2.Smallest passage area MA
The smallest passage area being formed in the fuel channel in nozzle body 3, especially from fuel storage cell 12 to each spray orifice
Smallest passage area in the fuel channel area of outlet 32.
It defines end in the low promotion time of needle-like piece 2 and high promotion time, the fuel injection nozzle 1 of the present embodiment and stretches
Axial distance L0 between the end 17 in portion 6 and the center of each spray orifice entrance 31 out.The injection diameter φ D of spray orifice 7 is along axial direction
Axial component be φ Dy.When needle-like piece 2 closes valve, from the center of each spray orifice entrance 31 to the end of end extension 6
17 axial distance is L0.The lift amount of needle-like piece 2 is L.
In the low promotion time of needle-like piece 2, meet the relationship of │ L-L0 │ > φ Dy/2.On the other hand, in the height of needle-like piece 2
The time is promoted, the relationship of │ L-L0 │≤φ Dy/2 is met.It should be noted that in the low promotion time needle-like piece 2 of needle-like piece 2
Low lift amount takes bigger value compared to the high high lift amount for promoting time needle-like piece 2 in needle-like piece 2.
The above-mentioned threshold value of needle-like piece lift amount will be used for referring to Fig. 5 to Fig. 7 detailed description.As shown in figure 5, corresponding to low mention
Liter period LS (in the period, seat aisle spare α is less than spray orifice overall channel area β) and high promotion period LL, (in the period, seat was logical
Road area α is arranged to threshold value greater than the lift amount of the needle-like piece 2 on boundary between spray orifice overall channel area β).The longitudinal axis in Fig. 5
Indicate the lift amount of needle-like piece, the horizontal axis in Fig. 5 indicates the size relation between α and β.Specifically, when the relationship between α and β
When being expressed as α < β, the lift amount of needle-like piece is less than the low lift amount of threshold value, and fuel injection amount is less than the small spray of predetermined value
The amount of penetrating.When the relationship between α and β is expressed as α > β, the lift amount of needle-like piece is greater than the high lift amount of threshold value, fuel injection
Amount is greater than the big the amount of injection of predetermined value.
As shown in fig. 6, correspond to seat aisle spare α be nozzle interior channel smallest passage area MA expanded reach and
Spray orifice overall channel area β is the liter of the needle-like piece on the boundary between the expanded reach of the smallest passage area MA in nozzle interior channel
Journey amount can be set to threshold value.The longitudinal axis in Fig. 6 indicates the lift amount of needle-like piece, and the horizontal axis in Fig. 6 indicates MA=α and MA=β
Between relationship.Specifically, when the relationship between MA and α is expressed as MA=α, the lift amount of needle-like piece is less than the low of threshold value
Lift amount, fuel injection amount are less than the small the amount of injection of predetermined value.When the relationship between MA and β is expressed as MA=β, needle-like piece
Lift amount be greater than the high lift amount of threshold value, fuel injection amount is greater than the big the amount of injection of predetermined value.
As shown in fig. 7, working as needle-like piece 2 from the time that its fully closed position is promoted to intermediate lift position occupancy is TM,
And needle-like piece 2 from its fully closed position to be promoted to time that complete raised position occupies be TF when, can will correspond to TM
The lift amount of needle-like piece be set as threshold value.The longitudinal axis indicates the lift amount of needle-like piece in Fig. 7, and horizontal axis indicates that needle-like piece 2 is complete from its
Full-application position is promoted to the time that complete raised position is passed.In this case, measurement is promoted since needle-like piece 2
Time to the time that α > β is converted into from α < β, the time of the measurement can be set as TM.Measurement is promoted since needle-like piece 2
Time to the time that MA=β is converted into from MA=α, the time of the measurement can be set as TM.
Therefore, in the period of from T0 to TM, the lift amount of needle-like piece is less than the low lift amount of threshold value, and fuel injection amount is
Less than the small the amount of injection of predetermined value.In the period of from TM to TF, the lift amount of needle-like piece is greater than the high lift amount of threshold value, fuel
The amount of injection is greater than the big the amount of injection of predetermined value.For example, according to the volume of end extension 6, the spatial volume of bag-shaped room 8, spray
Above-mentioned threshold value can be changed to biggish needle-like piece lift amount side or be changed by the overall channel area in hole or the promotion speed of needle-like piece
Change to lesser needle-shaped lift amount side.In the present embodiment, the 50% of complete lift amount is set the threshold to.It is of course also possible to
Set the threshold to the arbitrary value within the scope of the 30-70% of complete lift amount.
It explains hereinafter with reference to Fig. 1 and Fig. 4 A in the low promotion time of needle-like piece 2, flowing feelings of the fuel in bag-shaped room 8
Shape.The side that portions 5 are moved to when portions 5 are detached from from seat surface 10 is referred to as along axial upside.When portions 5 are engaged with seat surface 10
When the side that is moved to of portions 5 be referred to as along axial downside.It, will be between L, L0 and φ Dy in the low promotion time of needle-like piece 2
Relationship is set as meeting │ L-L0 │ > φ Dy/2.Decline φ Dy/ from the center of spray orifice entrance 31 along the direction of nozzle-axis Y
2 position is known as base position.In this case, in the low promotion time of needle-like piece 2, the end of end extension 6 17
In the downside of the base position.In this case, the relationship between α and β is expressed as α < β, and MA=α.
Therefore, seat aisle spare α is smallest passage area MA, and fuel is flowed into the stream in bag-shaped room 8 from fuel channel 13
Dynamic speed will be faster than the high promotion time.Since spray orifice overall channel area β is greater than seat aisle spare α, fuel is passed through in spray orifice 7
The flowing velocity and spray orifice outlet flow rate in portion are slower than the high promotion time.Compared to fuel channel 13, the channel of bag-shaped room 8
Area Quick Extended.In this case, from the fuel channel 13 of upstream side be flowed into most of fuel in bag-shaped room 8 along
The surface flow of end extension 6.Next, the fuel split away off from the end of end extension 6 is flowed along nozzle-axis Y
Enter the bottom wall surface to room 8 bag-shaped on downstream side, and at an acute angle with the periphery of bag-shaped room 8 in the bottom wall surface of bag-shaped room 8
Ground slight curvature.Then, the fuel to swirl in bag-shaped 8 bottom wall surface of room flows to upside on the downside of bag-shaped room, and slightly curved
Song is passed through respective spray orifice entrance 31 to the periphery of bag-shaped room 8 and is flowed into spray orifice 7.
On the other hand, a part of fuel in bag-shaped room 8 is flowed into along the perpendicular wall surfaces of bag-shaped room 8 from fuel channel 13
Flow to the downside of bag-shaped room 8.Then, the periphery of the fuel and bag-shaped room 8 that have flowed into 8 downside of bag-shaped room is at an acute anglely slightly
Bending, is flowed into spray orifice 7 with will pass through respective spray orifice entrance 31.Therefore, fuel to the upper side is flowed from the downside of bag-shaped room 8
It is collided each other at each spray orifice entrance 31 with from the fuel of the upside of bag-shaped room 8 flow direction downside.As a result, by each
Turbulent flow is generated in the fuel of 7 inside of spray orifice.Due to generating turbulent flow in the fuel by 7 inside of each spray orifice, for from
Each spray orifice 7 is ejected into the injection characteristics of the fuel of combustion chamber, and solid line indicates in as shown in Figure 4 A and Fig. 8, can obtain this
The injection characteristics of sample: i.e. jet angle of the jet angle of injected fuel spray F1 greater than injected fuel spray F2, and being sprayed for injected fuel spray F1 is worn
Saturating power is less than the spraying penetration power of injected fuel spray F2.
It is explained hereinafter with reference to Fig. 1 and Fig. 4 B and promotes time, flowing feelings of the fuel in bag-shaped room 8 in the high of needle-like piece 2
Shape.High in needle-like piece 2 promotes the time, and the relationship between L, L0 and φ Dy is set as to meet │ L-L0 │≤φ Dy/2.Along spray
The direction of mouth axis Y is referred to as upper base position from the position that the center of spray orifice entrance 31 rises φ Dy/2.Along nozzle shaft
The direction of line Y is referred to as lower base position from the position of the center of spray orifice entrance 31 decline φ Dy/2.In this case,
High in needle-like piece 2 promotes time, range of the end 17 of end extension 6 between upper base position and lower base position
It is interior.In this case, the relationship between α and β is expressed as α > β, and MA=β.
Therefore, spray orifice overall channel area β is smallest passage area MA, and fuel is flowed into bag-shaped room 8 from fuel channel 13
Flowing velocity will be slower than the low promotion time.Since spray orifice overall channel area β is less than seat aisle spare α, each spray orifice 7 is passed through
The fuel flow rate and spray orifice outlet flow rate of inside are faster than the low promotion time.Compared to bag-shaped room 8, spray orifice overall channel
Area β quickly reduces.In this case, most of fuel in bag-shaped room 8 is flowed into from fuel channel 13 to stretch out from end
It falls off at the crestal line 33 of the surface in portion 6 and close bag-shaped 8 entrance of room.Then, it is taken off from the surface of end extension 6 and crestal line 33
The fuel fallen bends to outside in bag-shaped room 8 with major diameter mitigation, is flowed into spray orifice 7 to be passed through respective spray orifice entrance 31
In.Therefore, turbulent flow will not be generated in the fuel by each 7 inside of spray orifice.Combustion is ejected into from each spray orifice 7 relative to fuel
The injection characteristics of room are burnt, solid line indicates in as shown in Figure 4 B and Fig. 8, can obtain such feature: i.e. injected fuel spray F2's
Jet angle is less than the jet angle of injected fuel spray F1, and the spraying penetration power of injected fuel spray F2 is greater than being sprayed for injected fuel spray F1 and penetrates
Power.Therefore, it can be realized powerful spraying penetration power in the high promotion time of needle-like piece 2.In the low promotion time of needle-like piece 2,
The spraying penetration power is weakened.
Report is used for the experimental result of the present embodiment below.It will explain when needle-like piece is promoted from its fully closed position
When to complete raised position, experimental study that how jet angle of fuel changes.Experimental result is as illustrated in the graph of figure 8.It is aobvious and
It is clear to, can be seen that the low promotion period LS in needle-like piece 2 from the chart of Fig. 8, sprayed compared to traditional fuel injection
Mouth, the fuel injection nozzle 1 of the present embodiment are intended to have broader angle and lower penetrate injection.It is also shown in figure
The high promotion period LL of needle-like piece 2, compared to the fuel injection nozzle 1 of the present embodiment, traditional fuel injection nozzle is intended to
With broader angle and lower penetrate injection.
The longitudinal axis in Fig. 8 indicates that the spray angle of fuel, horizontal axis indicate to be promoted to when needle-like piece 2 from its fully closed position
The time that complete raised position is passed.Needle-like piece 2 from its fully closed position be promoted to intermediate lift position it is occupied when
Between be TM, needle-like piece 2 from its fully closed position be promoted to the complete raised position occupied time be TF.Solid line in Fig. 8
Represent the spy that the short dash line in the characteristic curve CN, Fig. 8 of the fuel injection nozzle 1 of the present embodiment represents traditional fuel injection nozzle
Levy line EN.
Therefore, spraying penetration power can be weakened in the low promotion time of needle-like piece 2.Therefore, it can be mentioned in the low of needle-like piece 2
Rise time reduction cooling loss.The spraying penetration power of fuel can be enhanced in the high promotion time of needle-like piece 2.Therefore, Neng Gou
The high of needle-like piece 2 promotes time reduction exhaust smoke level.The fuel injection nozzle 1 of the present embodiment, which can obtain, as a result, both reduces cooling
Loss reduces the effect of exhaust smoke level again.
The variants of the present embodiment explained below.In the present embodiment, it has been described that the disclosure is applied to injection high pressure
In the fuel injection nozzle 1 of fuel, wherein the high pressure fuel is introduced directly into the combustion chamber of engine from supply pump or common rail
In.However, the disclosure can also be applied to such fuel injection nozzle: i.e. fuel from such as line fuel pump or distribution formula fuel
The fuel-injection pump of pump etc enters fuel storage cell by direct force feed.When the fuel pressure in fuel storage room is more than pushing away for spring
When power, needle-like piece opens valve, and fuel injection nozzle is directly to direct injection type engine spray fuel.
In the present embodiment, it has been described that it is complete from its in fuel injection that embodiment of the disclosure is applied to needle-like piece 2
Full-application position is promoted to the such fuel injection nozzle 1 of complete raised position.However, the disclosure also can be applied to rise
In the variable fuel injection nozzle 1 of journey amount, wherein the amount of injection required for engine is less than the feelings of the small the amount of injection of predetermined value
Under shape, needle-like piece 2 is promoted to low raised position from its fully closed position, and the amount of injection required for engine is greater than predetermined value
Big the amount of injection in the case of needle-like piece 2 from its fully closed position promote supreme raised position.Even in needle-like piece 2 from its
Fully closed position is promoted in the such fuel injection nozzle 1 of complete raised position, if the energization period of actuator
Short, although then needle-like piece 2 is promoted completely from the realization of its fully closed position, needle-like piece 2 is also only capable of being promoted to its low promotion position
It sets.
In the present embodiment, it has been described that embodiment of the disclosure is applied to promote speed with constant needle-like piece
In fuel injection nozzle 1.However, the promotion speed that the disclosure also can be applied to the needle-like piece in the lifting process of needle-like piece changes
In the fuel injection nozzle of change.In addition, the disclosure can be applied in the fuel injection nozzle 1 of the stage promotion of needle-like piece 2.?
In the present embodiment, fuel injection nozzle 1 is configured to the needle-like piece 2 of fuel injection nozzle 1 directly by solenoid actuator or pressure
The drive force of electric actuator opens valve, and closes valve by the motive force of spring.It would however also be possible to employ helical
Pipe valve or piezoelectric actuator open/close the actuator of valve, solenoid valve or piezoelectricity described here as driving needle-like piece 2
Actuator is adjustable to be set up directly on the fuel pressure in the control room of 2 top of needle-like piece and beats ON/OFF with control needle-like piece 2
Closed operation.
In the present embodiment, using DI diesel engine as direct injection type engine.Alternatively, can also be with
Using toroidal swirl type petrol engine as direct injection type engine.In the present embodiment, the centre bit of spray orifice entrance 31
Boundary between the inner peripheral surface and bottom wall surface of bag-shaped room 8.Alternatively, the center of spray orifice entrance 31 can be only located at bag-shaped room
On 8 perpendicular wall surfaces.In addition, the center of spray orifice entrance 31 can also be only located in the bottom wall surface of bag-shaped room 8.Entire needle-like piece
Front end geometry can be spheric, conical butt or cone.The present disclosure is not limited to embodiments as described above, can incite somebody to action
It is practiced in various variants.
In short, the fuel injection nozzle 1 according to above-described embodiment can be described below.
In the one side of the disclosure, when needle-like piece lift amount is less than threshold value, L, L0 and φ Dy meet │ L-L0 │ > φ
The relationship of Dy/2.Therefore, when needle-like piece lift amount is less than threshold value, it is easy to generate in through the fuel stream inside each spray orifice
Turbulent flow, the injected fuel spray penetration power being ejected into combustion chamber by spray orifice die down.On the other hand, when needle-like piece lift amount is greater than threshold
When value, L, L0 and φ Dy meet the relationship of │ L-L0 │≤φ Dy/2.Therefore, when the lift amount of needle-like piece is greater than threshold value, logical
It is not likely to produce turbulent flow in the fuel stream crossed inside each spray orifice, the enhancing of the spraying penetration power in combustion chamber is ejected by spray orifice.
Therefore, when the lift amount of needle-like piece is greater than threshold value, spraying penetration power can enhance.When the lift amount of needle-like piece is less than threshold value
Spraying penetration power can weaken.Its details is described in detail referring to attached drawing in the above-described embodiments.
Although having been combined embodiment describes the disclosure, but it is to be understood that the present disclosure is not limited to the embodiment and
Structure.The disclosure is intended to cover various modifications and equivalent arrangements.In addition, including although having had various combinations and construction
More, less or the other of discrete component combine and construction is also in the spirit and scope of the disclosure.
Claims (4)
1. a kind of fuel injection nozzle (1) for engine, comprising:
Nozzle body (3), with cylindrical form and includes
Multiple spray orifices (7), fuel are ejected into the combustion chamber of the engine by the multiple spray orifice；
The fuel channel (13) being formed on the upstream side of the multiple spray orifice (7)；
Limit the seat surface (10) of the cone of the fuel channel (13)；With
The bag-shaped room (8) being arranged on the downstream side of the fuel channel (13), wherein the multiple spray orifice (7) circumferentially cloth
It sets, and respectively includes the entrance (31) on the inner peripheral surface of the bag-shaped room (8)；And
It is contained in the nozzle body (3) can be wrapped along the needle-like piece (2) of the axial reciprocating of the nozzle body (3) movement
It includes:
Annular seats (5) are engaged or disengaged with the seat surface (10) to close or open the fuel channel (13)；With
Cone end extension (6), be located at the portions (5) downstream side on, and when the portions (5) with it is described
Seat surface (10) is located in the bag-shaped room (8) when engaging, in which:
It is known:
φ Dy is the injection diameter (φ D) of each spray orifice in the multiple spray orifice (7) along axial axial component；
L0 is the entrance (31) when the needle-like piece (2) close fuel channel (13) from the multiple spray orifice (7)
In each entrance center to the end (17) of the entire needle-like piece (2) axial distance；And
L is the lift amount of the needle-like piece (2),
When the lift amount (L) of the needle-like piece (2) is less than preset threshold value, meet the relationship of │ L-L0 │ > φ Dy/2；And
When the lift amount (L) of the needle-like piece (2) is greater than the threshold value, meet the relationship of │ L-L0 │≤φ Dy/2.
2. fuel injection nozzle (1) according to claim 1, in which:
When the lift amount (L) of the needle-like piece (2) is less than the threshold value, it is outwardly formed from the portions (5) in the seat surface
(10) the seat aisle spare (α) between the portions (5) is set to be less than spray orifice overall channel area (β), and the spray orifice is total
Aisle spare is the summation of the aisle spare of the multiple spray orifice (7)；And
When the lift amount (L) of the needle-like piece (2) is greater than the threshold value, the seat aisle spare (α) is set to be greater than institute
State spray orifice overall channel area (β).
3. fuel injection nozzle (1) according to claim 1 or 2, wherein the lift amount (L) when the needle-like piece (2) is small
When the threshold value, the seat aisle spare that is outwardly formed from the portions (5) between the seat surface (10) and the portions (5)
(α) is set to the smallest passage area (MA) in the fuel channel formed in the nozzle body (3).
4. fuel injection nozzle (1) according to claim 1 or 2, wherein the lift amount (L) when the needle-like piece (2) is big
When the threshold value, the spray orifice overall channel area (β) of the summation of the aisle spare as the multiple spray orifice (7) is set to
The smallest passage area (MA) in fuel channel formed in the nozzle body (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015126661A JP2017008859A (en) | 2015-06-24 | 2015-06-24 | Fuel injection nozzle |
| JP2015-126661 | 2015-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106286056A CN106286056A (en) | 2017-01-04 |
| CN106286056B true CN106286056B (en) | 2019-06-18 |
Family
ID=57537540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610470844.1A Active CN106286056B (en) | 2015-06-24 | 2016-06-24 | Fuel injection nozzle |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2017008859A (en) |
| CN (1) | CN106286056B (en) |
| DE (1) | DE102016109763A1 (en) |
| FR (1) | FR3038010B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996349A (en) * | 2017-04-19 | 2017-08-01 | 四川森洁燃气设备有限公司 | A kind of combustion gas adjustable type spout structure |
| US20200240380A1 (en) * | 2017-12-12 | 2020-07-30 | Hitachi Automotive Systems, Ltd. | Fuel Injection Valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264365A (en) * | 1998-03-19 | 1999-09-28 | Denso Corp | Fuel injection valve |
| US6959878B1 (en) * | 1999-11-17 | 2005-11-01 | Stanadyne Corporation | Compact fuel injection nozzle |
| CN103261662A (en) * | 2010-12-20 | 2013-08-21 | 丰田自动车株式会社 | Fuel injection valve |
| JP2013185455A (en) * | 2012-03-06 | 2013-09-19 | Mazda Motor Corp | Fuel injection valve, and internal combustion engine comprising the same |
| CN104704230A (en) * | 2012-10-12 | 2015-06-10 | 丰田自动车株式会社 | Fuel injection valve |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110378U (en) * | 1983-01-17 | 1984-07-25 | 日産自動車株式会社 | fuel injection nozzle |
| JP3033431B2 (en) * | 1994-03-30 | 2000-04-17 | 三菱自動車工業株式会社 | Fuel injection nozzle |
| DE19820513A1 (en) * | 1998-05-08 | 1999-11-11 | Mtu Friedrichshafen Gmbh | Fuel injection nozzle for internal combustion engine |
| JP2010174819A (en) | 2009-01-30 | 2010-08-12 | Denso Corp | Fuel injection valve |
| JP2010180763A (en) * | 2009-02-04 | 2010-08-19 | Nippon Soken Inc | Fuel injection nozzle |
| JP2013019386A (en) * | 2011-07-13 | 2013-01-31 | Toyota Central R&D Labs Inc | Fuel injection valve |
| JP2014020339A (en) * | 2012-07-23 | 2014-02-03 | Okayama Univ | Fuel injection nozzle |
-
2015
- 2015-06-24 JP JP2015126661A patent/JP2017008859A/en active Pending
-
2016
- 2016-05-27 DE DE102016109763.2A patent/DE102016109763A1/en not_active Withdrawn
- 2016-06-23 FR FR1655859A patent/FR3038010B1/en not_active Expired - Fee Related
- 2016-06-24 CN CN201610470844.1A patent/CN106286056B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264365A (en) * | 1998-03-19 | 1999-09-28 | Denso Corp | Fuel injection valve |
| US6959878B1 (en) * | 1999-11-17 | 2005-11-01 | Stanadyne Corporation | Compact fuel injection nozzle |
| CN103261662A (en) * | 2010-12-20 | 2013-08-21 | 丰田自动车株式会社 | Fuel injection valve |
| JP2013185455A (en) * | 2012-03-06 | 2013-09-19 | Mazda Motor Corp | Fuel injection valve, and internal combustion engine comprising the same |
| CN104704230A (en) * | 2012-10-12 | 2015-06-10 | 丰田自动车株式会社 | Fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016109763A1 (en) | 2016-12-29 |
| CN106286056A (en) | 2017-01-04 |
| FR3038010A1 (en) | 2016-12-30 |
| JP2017008859A (en) | 2017-01-12 |
| FR3038010B1 (en) | 2020-02-07 |
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