CN104903569A - Fuel injection device and diesel engine - Google Patents
Fuel injection device and diesel engine Download PDFInfo
- Publication number
- CN104903569A CN104903569A CN201480004083.XA CN201480004083A CN104903569A CN 104903569 A CN104903569 A CN 104903569A CN 201480004083 A CN201480004083 A CN 201480004083A CN 104903569 A CN104903569 A CN 104903569A
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- Prior art keywords
- fuel
- valve
- orifice
- fuel oil
- space
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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
- F02M61/16—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
- F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
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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
- F02M61/042—The valves being provided with fuel passages
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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
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
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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
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The purpose of the present invention is to provide a fuel injection device and diesel engine whereby it is possible to reduce the amount of fuel oil supplied to a combustion chamber when a valve is closed. A fuel injection device (10) is provided with a housing (14), a needle valve (26), a spool valve (44) provided to a distal end of the needle valve (26), and a vertical groove (23) formed in a different position from fuel injection holes (16a-16d) and communicated with a fuel supply path (24), a fuel oil introduction space (27) through which fuel oil passes being formed in the spool valve (44), the fuel oil introduction space (27) being communicated with the vertical groove (23) and the fuel oil introduction space (27) moving to a position of communication with the fuel injection holes (16a-16d) when the fuel supply passage (24) is open, and an external peripheral face of the spool valve (44) confronting the fuel injection holes (16a-16d) and the fuel oil introduction space (27) moving to a position of non-communication with the fuel injection holes (16a-16d) when the fuel supply path (24) is closed.
Description
Technical field
The present invention relates to a kind of fuel injection system for internal-combustion engines such as diesel engines, and diesel engine.
Background technique
Fuel injection system is arranged on the cylinder head of the internal-combustion engines such as diesel engine, and the front end of the shell of fuel injection system is outstanding in firing chamber.Be formed with fuel orifice at the front end of shell, and the inside of shell is provided with needle-valve.Needle-valve is by being supplied to the oil pressure of the fuel oil in shell, and depart from and valve opening from valve seat, fuel oil feeds to fuel orifice.Its result, fuel oil sprays in firing chamber from fuel orifice.In a combustion chamber, because fuel oil mixes on fire with air, and form flame, flame spread is in whole firing chamber.
Record in patent documentation 1: the front end of the rotatingshaft of valve is provided with cut-off component, described cut-off component has two barrel in the center hole that is entrenched in sprayer.Two cylindrical members are made up of with the second barrel being positioned at upside the first barrel being positioned at downside.
Prior art document
Patent documentation
Patent documentation 1: Japan Patent spy table 2010-512484 publication
Brief summary of the invention
The problem that invention quasi-solution is determined
Fuel injector disclosed in patent documentation 1, by end component the second barrel outer circumferential face and be formed at sprayer axle core center hole inner peripheral surface between passage, to be positioned at upside second group of nozzle bore fuel oil is provided.On the other hand, when valve rod is positioned at blocking position, the surrounding due to the second barrel is embedded in center hole, and the fuel feeding to second group of nozzle bore is cut off.
But, in the fuel injector described in patent documentation 1, between the first barrel and the second barrel, be formed with the recess of ring-type.But when valve rod is positioned at blocking position, the recess of ring-type is communicated with second group of nozzle bore.Therefore, after dripping phenomenon can occur, even if that is: close valve, the fuel oil accumulating in annular recessed portion still can flow along second nozzle hole, and there is fuel oil supply firing chamber.That is, owing to being formed with the recess of ring-type, the needle-valve pressure chamber volume of fuel injector increases.
In addition, in the fuel injector described in patent documentation 1, when valve rod is positioned at open position, the second barrel and the chimeric disengaging of center hole, only have the first barrel to be entrenched in center hole.Therefore, the slip of the rotatingshaft of valve rod easily becomes unstable.And when valve rod moves towards blocking position, the second barrel contacts with the inner peripheral surface of center hole and is fitted together to, and therefore easily damages rotatingshaft.
The present invention does in view of the above problems, its object is to provide a kind of fuel injection system being supplied to the amount of fuel of firing chamber when reducing valve closing, and diesel engine.
The method of dealing with problems
Fuel injection system involved by first form of the present invention, has: shell, and its inside is formed with fuel feed passage, and front end is formed with fuel orifice; Needle-valve, it is configured in described enclosure, fuel feed passage according to fuel pressure opening and closing; Guiding valve, it is arranged on the front end of described needle-valve, and outer circumferential face contacts with the inner peripheral surface of described shell and slides; Ditch portion, it is formed at positions different from described fuel orifice in the inner peripheral surface of described shell, is communicated with described fuel feed passage; Described guiding valve is formed with fuel oil and imports space from its fuel oil circulated, when described fuel feed passage is open, described fuel oil imports space and is communicated with described ditch portion, and, described fuel oil imports space and moves to the position be communicated with described fuel orifice, when described fuel feed passage is closed, the outer circumferential face of described guiding valve is towards described fuel orifice, and described fuel oil imports space and moves to position disconnected with described fuel orifice.
Adopt this structure, when fuel feed passage is open, the fuel oil imported from ditch portion imports space by the fuel oil of guiding valve and sprays from fuel orifice.On the other hand, when fuel feed passage is closed, the outer circumferential face of needle-valve is in the face of fuel orifice, and fuel oil imports space and fuel orifice is disconnected, does not therefore have fuel and is provided to spray-hole from fuel importing space.Therefore, after dripping phenomenon can not occur, that is: when needle-valve is closed time, the fuel oil accumulating in fuel oil importing space flows along fuel orifice, and there is fuel oil supply firing chamber.
In the invention involved by above-mentioned 1st form, preferably: the upper periphery face of described guiding valve, when described fuel feed passage carries out on-off action, contacts with the inner peripheral surface of described shell all the time.
Adopt this structure, when the outer circumferential face of guiding valve contacts with the inner peripheral surface of shell because of the on-off action of fuel feed passage and slides, being positioned at the outer circumferential face that fuel oil imports top, space in guiding valve can contact with the inner peripheral surface of shell all the time.In addition, when fuel feed passage is open, the fuel oil being fed to guiding valve from ditch portion is imported space by fuel oil.Its result, even if needle-valve be formed in guiding valve concavity fuel oil import space, also can be imported the outer circumferential face on top, space by fuel oil, and support by shell, therefore the action of needle-valve is more stable.In addition, because the outer circumferential face of guiding valve contacts with the inner peripheral surface of shell all the time, therefore not easily there is the damage caused owing to repeatedly contact/not contacting.
In the invention involved by above-mentioned 1st form, described fuel oil importing space is formed as ring-type and also can on described guiding valve.
Adopt this structure, because in shell, fuel orifice is arranged on the position different from ditch portion, and, fuel oil imports space is formed in guiding valve periphery with ring-type, therefore, import space from this process that spray-hole sprays at fuel oil from ditch portion by fuel oil, the channel resistance of fuel oil is constant, regardless of the rotational position of needle-valve.That is, even if when needle-valve have rotated around axis, the channel resistance of fuel oil also can not become, thus can stably injected fuel.
Can expect below with reference to case: contrary with above, shell not form ditch portion, but such as axially on the rotatingshaft of needle-valve, forms groove, or towards axially forming through hole on guiding valve, fuel be provided to fuel oil and import space.But, when above-mentioned reference case, there will be fuel oil import fuel oil import the position in space according to the rotational position of needle-valve with situation far away time near during fuel orifice, the channel resistance therefore to fuel oil from fuel orifice injection can change.And in the present invention, import the position in space be namely formed in the position in ditch portion on shell and the position of fuel orifice is fixing because fuel oil imports fuel oil, therefore the channel resistance of fuel oil can not change.
In the invention involved by above-mentioned 1st form, also can be: described fuel orifice, epimere fuel orifice and hypomere fuel orifice is axially provided with at described shell, described guiding valve inside is formed with the fuel feed passage in the space of the below for supplying fuel to described guiding valve, when described fuel feed passage is open, described fuel oil imports space and is communicated with described ditch portion, and, described fuel oil imports space and moves to the position be communicated with described epimere fuel orifice, simultaneously, the space of the below of described guiding valve is communicated with described ditch portion, and, the space of the below of described guiding valve is communicated with described hypomere fuel orifice.
Adopt this structure, when fuel feed passage is open, the fuel oil imported from ditch portion imports space by fuel oil and sprays from epimere fuel orifice, is sprayed by the space of the below of guiding valve from lower end fuel orifice simultaneously.Fuel oil imports the space below space and guiding valve, is communicated with by being formed at the ditch portion of the inner peripheral surface of shell, therefore, it is possible to the fuel oil sprayed from epimere fuel orifice and hypomere fuel orifice, channel resistance and jet pressure is kept impartial.
In the invention involved by above-mentioned 1st form, also can be: be formed with multiple described ditch portion at the inner peripheral surface of described shell, multiple described ditch portions are arranged on the inner peripheral surface of described shell with the spacing of equalization.
Adopt such structure, when needle-valve is subject to reaction force because importing to the fuel oil in ditch portion, because ditch portion arranges equalization, therefore not easily there is skew in the position of needle-valve.Thereby, it is possible to alleviate guiding valve to be pressed against the inner peripheral surface of shell and the possibility causing slip surface impaired.
In the invention involved by above-mentioned 1st form, also can be: described ditch portion and described fuel orifice, keep the spacing of more than described fuel orifice bore and formed.
Adopt this structure, can reduce when needle-valve is closed, between described ditch portion and described fuel orifice, the possibility that fuel oil passes through from the gap between the inner peripheral surface and the outer circumferential face of guiding valve of shell and flows out from fuel orifice.
Diesel engine involved by 2nd form of the present invention, possesses above-mentioned fuel injection system at cylinder head.
Adopt this structure, have fuel injection system in the cylinder head of diesel engine, at fuel injection system, when fuel feed passage is open, the fuel oil imported from ditch portion imports space by the fuel oil of guiding valve and sprays from fuel orifice.On the other hand, when fuel feed passage is closed, the outer circumferential face of needle-valve is in the face of fuel orifice, and fuel oil imports space and fuel orifice is disconnected, does not therefore have fuel and is supplied to spray-hole from fuel importing space.Therefore, after dripping phenomenon can not occur, that is: when needle-valve is closed time, the fuel oil accumulating in fuel oil importing space flows along fuel orifice, and there is fuel oil supply firing chamber.
Invention effect
Adopt the present invention, the amount of fuel being supplied to firing chamber when valve closing can be reduced.
Accompanying drawing explanation
Fig. 1 is sketch and the sectional arrangement drawing of fuel injection system involved by the 1st mode of execution of the present invention, represents state when needle-valve is closed.
Fig. 2 is the sectional arrangement drawing of the fuel injection system involved by the 1st mode of execution of the present invention, represents state when needle-valve is opened.
Fig. 3 is the drawing in side sectional elevation cut at the C-C line of Fig. 1.
Fig. 4 is the drawing in side sectional elevation cut at the D-D line of Fig. 1.
Fig. 5 is the drawing in side sectional elevation cut at the C-C line of Fig. 2.
Fig. 6 is the drawing in side sectional elevation cut at the D-D line of Fig. 2.
Fig. 7 is the drawing in side sectional elevation cut at the E-E line of Fig. 2 or Figure 10, represents an example of longitudinal furrow.
Fig. 8 is the drawing in side sectional elevation cut at the E-E line of Fig. 2 or Figure 10, represents another example of longitudinal furrow.
Fig. 9 is the sectional arrangement drawing of the fuel injection system involved by the 2nd mode of execution of the present invention, represents state when needle-valve is closed.
Figure 10 is the sectional arrangement drawing of the fuel injection system involved by the 2nd mode of execution of the present invention, represents state when needle-valve is opened.
Figure 11 is the drawing in side sectional elevation cut at the C-C line of Fig. 9.
Figure 12 is the drawing in side sectional elevation cut at the D-D line of Fig. 9.
Figure 13 is the drawing in side sectional elevation cut at the C-C line of Figure 10.
Figure 14 is the drawing in side sectional elevation cut at the D-D line of Figure 10.
Embodiment
Referring to accompanying drawing, mode of execution involved in the present invention is described.
[the 1st mode of execution]
Fuel injection system 10 involved by 1st mode of execution of the present invention is described.Fuel injection system 10 is applicable to the internal-combustion engines such as the boats and ships large-scale diesel engine of such as two stroke cycle type.
In fuel injection system 10, the shell 14 with drum is arranged on the cylinder head 12 of internal-combustion engine.Fig. 1 is skeleton diagram and the sectional arrangement drawing of fuel injection system involved by the 1st mode of execution of the present invention, represents state when needle-valve 26 is closed.Fig. 2 is state when representing that needle-valve 26 is opened.
As shown in Figure 1, oil pump 38 is connected with cylinder 34 by oil circuit 36.Cylinder 34 is connected with one end of oil circuit 32, and other one end of oil circuit 32 is connected with the fuel feed passage 18 be formed on shell 14.The inside of cylinder 34 is provided with and utilizes cam 42 and the piston 40 moved back and forth.Oil pump 38 provides fuel oil to cylinder 34, and the fuel oil in cylinder 34 is provided to fuel feed passage 18 by the rising of piston 40.
Shell 14 is provided with multiple fuel orifice on front end 14a.Front end 14a is outstanding in firing chamber 11 from 12a below cylinder head 12.Shell 14 is formed with cylindric center hole 21 along axis in inside, is accommodated with needle-valve 26 in center hole 21.In addition, although illustrate that the center hole 21 of shell 14 inside is for cylindric, being not limited in this, such as, also can be square tube shape.
Be formed with fuel feed passage 18 from the top of shell 14 towards bottom, fuel feed passage 18 is communicated with chamber 20.Be formed with valve seat 22 below chamber 20, the inner side of valve seat 22 is formed with fuel feed passage 24.The top of needle-valve 26 is provided with helical spring 30, and the elastic force of helical spring 30 presses on above needle-valve 26.Take this, when fuel feed passage 18 not having fuel oil for seasonable, the conical surface 28 of needle-valve 26 is pressed against on valve seat 22, closes the fuel feed passage 24 be arranged on below chamber 20.According to the oil pressure of fuel oil being supplied to fuel feed passage 18, needle-valve 26 is moved upward, and fuel feed passage 18 is communicated with fuel feed passage 24.
Guiding valve 44 is formed in the front end of needle-valve 26.The axis of guiding valve 44 is provided with fuel supplying hole 440.Fuel supplying hole 440 makes fuel feed passage 24 be communicated with in the space 25 formed more on the lower than guiding valve 44.Guiding valve 44 possesses: be positioned at the top large-diameter portion 442 of upside and separate with top large-diameter portion 442 and bottom large-diameter portion 444 on the downside of being positioned at.Minor diameter part 446 is formed between top large-diameter portion 442 and bottom large-diameter portion 444.Top large-diameter portion 442, bottom large-diameter portion 444, and minor diameter part 446 is such as cylindric.In addition, top large-diameter portion 442, bottom large-diameter portion 444, and minor diameter part 446 also can the shape of center hole 21 of corresponding shell 14 inside, is formed as square tube shape.
Top large-diameter portion 442 and bottom large-diameter portion 444 are embedded in the center hole 21 of shell 14, and the inner peripheral surface along center hole 21 slides.Needle-valve 26 is when closedown fuel feed passage 24, and as Fig. 1,3, and shown in 4, top large-diameter portion 442 closes fuel orifice 16a, 16b of upside, and bottom large-diameter portion 444 closes fuel orifice 16c, 16d of downside.
In the position of the minor diameter part 446 be equivalent between top large-diameter portion 442 and bottom large-diameter portion 444, the fuel oil being formed with ring-type imports space 27.Fuel oil imports space 27 and is formed as concavity towards the outer circumferential face than guiding valve 44 closer to central side, and fuel oil circulates from it.When the open fuel feed passage 24 of needle-valve 26, time fuel feed passage 18 is communicated with fuel feed passage 24, as shown in figures 2 and 5, fuel oil imports space 27 fuel orifice 16a, 16b towards upside, and fuel oil imports space 27 and is communicated with fuel orifice 16a, 16b.In addition, the space 25 formed more on the lower than guiding valve 44, as shown in Figures 2 and 6, towards fuel orifice 16c, 16d of downside, space 25 is communicated with fuel orifice 16c, 16d.In addition, as long as fuel oil imports space 27 ring-type, be not limited to circular.
4 fuel orifice 16a ~ 16d are divided into two spray-hole row A and B on the diverse location of the axis being arranged on shell 14 and configure.The spray-hole row A of top is made up of fuel orifice 16a and 16b, and the spray-hole row B of below is made up of fuel orifice 16c and 16d.Each fuel orifice 16a ~ 16d, as shown in Fig. 3 ~ Fig. 6, such as, relative to the axis of shell 14, is formed towards radiation direction.In addition, fuel orifice is not limited only to 4, such as can form 3 fuel orifices, form 3 fuel orifices at the spray-hole row B of below by spray-hole row A up, the fuel orifice that also can be formed in the spray-hole row A of top is inconsistent with the number of the fuel orifice of the spray-hole row B being formed in below.
At the inner peripheral surface of the center hole 21 of shell 14, be axially formed with longitudinal furrow 23.In shell 14, as depicted in figs. 3 and 5, longitudinal furrow 23 is arranged on on fuel orifice 16a, 16b diverse location.Longitudinal furrow 23, with the upper-lower position regardless of needle-valve 26, imports the length that space 27 is communicated with all the time and is formed with the fuel oil of fuel feed passage 24 and ring-type.Like this, even if when needle-valve 26 closes fuel feed passage 24, fuel oil also will be full of fuel oil and import space 27.
As shown in Figures 7 and 8, longitudinal furrow 23 is formed and multiplely also can on the inner peripheral surface of shell 14.Multiple longitudinal furrow 23 is arranged on the inner peripheral surface of shell with the spacing of equalization.Such as shown in Fig. 7, when be provided with even number bar as 2 longitudinal furrow 23,2 longitudinal furrows 23 are formed on relative surface of position opposite.In addition, as shown in Figure 8, when be provided with odd number bar as 3 longitudinal furrow 23, each bar longitudinal furrow 23 is with spaced set.Needle-valve 26 due to the pressurized fuel oil importing to longitudinal furrow 23, and is subject to reaction force.At this moment, because longitudinal furrow 23 arranges equalization, therefore not easily there is skew in the position of needle-valve 26.Thereby, it is possible to alleviate on inner peripheral surface that guiding valve 44 is pressed against shell 14 and cause slip surface to damage or firmly adhere to the possibility of (stickup).
Longitudinal furrow 23 and each distance L between fuel orifice 16a, 16b, as depicted in figs. 3 and 5, be preferably and keep the spacing of spray-hole more than bore d and formed.Like this, particularly can reduce when needle-valve 26 is closed, at longitudinal furrow 23 and between fuel orifice 16a, 16b, the possibility that fuel oil passes through gap between the inner peripheral surface of shell 14 and the outer circumferential face of guiding valve 44 and flows out from spray-hole 16a, 16b.
Next, the action of the fuel injection system 10 involved by present embodiment is described.
When not having fuel oil to be provided to fuel feed passage 18 from oil circuit 32, needle-valve 26 is landed on valve seat 22, closes fuel feed passage 24.
When fuel oil is provided to fuel feed passage 18 from oil circuit 32, according to the oil pressure of fuel oil, needle-valve 26 overcomes the elastic force of helical spring 30 and rises, and fuel feed passage 24 is opened.That is, before more than the oil pressure that the oil pressure of fuel oil reaches certain, needle-valve 26 can not rise, and fuel feed passage 24 keeps closed condition.
Like this, fuel oil through fuel supplying hole 440, arrives the space 25 of below from fuel feed passage 18 and fuel feed passage 24.In addition, fuel oil also from other paths, that is, from fuel feed passage 18 and fuel feed passage 24 through longitudinal furrow 23, arrive fuel oil and import space 27.
Coordinate rising and the decline of needle-valve 26, also rise with the guiding valve 44 of needle-valve 26 one and decline.According to the position of guiding valve 44, spray-hole row A and spray-hole row B opens or closes.When needle-valve 26 rises, time needle-valve 26 is opened, fuel oil imports space 27 and is communicated with longitudinal furrow 23, and fuel oil importing space 27 moves to the position be communicated with fuel orifice 16a, 16b of spray-hole row A.In addition, fuel orifice 16c, 16d of the bottom large-diameter portion 444 open spray-hole row B of guiding valve 44.Therefore, when guiding valve 44 rises, all fuel orifice 16a ~ 16d of spray-hole row A and spray-hole row B are opened.
On the other hand, when not having fuel oil from oil circuit 32 for seasonable, needle-valve 26 declines and is landed in valve seat 22, closes fuel feed passage 24.When needle-valve 26 is landed on valve seat 22, all fuel orifice 16a ~ 16d of spray-hole row A and spray-hole row B are by by the outer circumferential face of guiding valve 44, and namely top large-diameter portion 442 or bottom large-diameter portion 444 block.At this moment, fuel oil importing space 27 moves to on the disconnected position of fuel orifice 16a ~ 16d.
Adopt present embodiment, when needle-valve 26 is opened, the fuel oil imported from longitudinal furrow 23 is sprayed from fuel orifice 16a, 16b by the fuel oil importing space 27 of guiding valve 44.Meanwhile, arrive the fuel oil in the space 25 of below through fuel supplying hole 440, sprayed from fuel orifice 16c, 16d by the space 25 below guiding valve 44.
On the other hand, when needle-valve 26 is closed, the outer circumferential face of needle-valve 26 and top large-diameter portion 442 and bottom large-diameter portion 444, towards fuel orifice 16a ~ 16d, and fuel oil importing space 27 is not communicated with fuel orifice 16a ~ 16d, does not therefore have fuel and be supplied to fuel orifice 16a ~ 16d from fuel importing space.Therefore, after dripping phenomenon can not occur, that is: when needle-valve 26 is closed time, the fuel oil accumulating in fuel oil importing space 27 flows along fuel orifice 16a ~ 16d, and there is fuel oil supply firing chamber.
Be positioned at the outer circumferential face 442a that fuel oil imports the top in space 27 in guiding valve 44, that is, the outer circumferential face 442a of top large-diameter portion 442, in the on-off action of needle-valve 26, contacts with the inner peripheral surface of the center hole 21 of shell 14 all the time.
Like this, when the outer circumferential face of guiding valve 44 contacts with the inner peripheral surface of the center hole 21 of shell 14 because of the on-off action of needle-valve 26 and slides, the outer circumferential face 442a of top large-diameter portion 442 contacts with the inner peripheral surface of the center hole 21 of shell 14 all the time.In addition, when needle-valve 26 is opened, fuel oil is directed into fuel oil from longitudinal furrow 23 and imports space 27.Its result, even if needle-valve 26 be formed in guiding valve 44 concavity fuel oil import space 27, also can utilize the outer circumferential face 442a of top large-diameter portion 442, and support by shell 14, therefore the action of needle-valve 26 is more stable.In addition, because the outer circumferential face of guiding valve 44 contacts with the inner peripheral surface of the center hole 21 of shell 14 all the time, therefore not easily there is the damage caused owing to repeatedly contact/not contacting.
In addition, as shown in Figure 5, fuel oil imports space 27 and is formed as ring-type in the periphery of guiding valve 44.
Like this, in shell 14, fuel orifice 16a ~ 16d is arranged on the position different from longitudinal furrow 23, and, fuel oil imports space 27 is formed in guiding valve 44 periphery with ring-type, therefore, at fuel oil, from longitudinal furrow 23, by fuel oil importing space 27, from this process that spray-hole sprays, the channel resistance of fuel oil is constant, regardless of the rotational position of needle-valve 26.That is, even if when needle-valve 26 have rotated around axis, the channel resistance of fuel oil also can not become, can stably injected fuel.
Can expect below with reference to case: contrary with above, shell 14 not form longitudinal furrow 23, but such as axially on the rotatingshaft of needle-valve 26, forms groove, or towards axially forming through hole on guiding valve 44, supply fuel to fuel oil and importing space 27.But, when above-mentioned reference case, there will be fuel oil import fuel oil import the position in space 27 according to the rotational position of needle-valve 26 with situation far away time near during fuel orifice 16a ~ 16d, the channel resistance therefore to fuel oil from fuel orifice 16a ~ 16d injection can change.On the other hand, in the present embodiment, namely the position due to fuel oil importing fuel oil importing space 27 is formed in the position of the longitudinal furrow 23 of shell 14 and the position of fuel orifice 16a ~ 16d is fixing, and therefore the channel resistance of fuel oil can not change.
[the 2nd mode of execution]
Following with reference to Fig. 9 ~ Figure 14, the fuel injection system 10 involved by the 2nd mode of execution of the present invention is described.
In the 1st mode of execution and present embodiment, longitudinal furrow is different, and other structures are all identical, therefore omit repeat specification.
In the above-described first embodiment, when needle-valve 26 is opened, longitudinal furrow 23 is not communicated with the space 25 of the below of guiding valve 44.In this case, the passage that fuel orifice 16a, 16b of spray-hole row A upward passage of supplying fuel oil and fuel orifice 16c, 16d of spray-hole row B downwards supply fuel oil is what to separate.Therefore, both channel resistances are different.
In the present embodiment, as shown in Figure 10 and Figure 14, even if longitudinal furrow 29 is formed to when needle-valve 26 is opened, the position be also communicated with the space 25 of the below of guiding valve 44.
Adopt present embodiment, when needle-valve 26 is opened, the fuel oil imported from longitudinal furrow 29 is sprayed from fuel orifice 16a, 16b of epimere by fuel oil importing space 27, is sprayed from fuel orifice 16c, 16d of hypomere by the space 25 of the below of guiding valve 44 meanwhile.
Fuel oil imports the space 25 of the below of space 27 and guiding valve, be communicated with by being formed at the longitudinal furrow 29 of the inner peripheral surface of shell 14, therefore to from epimere fuel orifice 16a, 16b and hypomere fuel orifice 16c, the fuel oil that 16d sprays, can keep impartial by channel resistance and jet pressure.
Symbol description
10 fuel injection systems
11 firing chambers
12 cylinder heads
14 shells
16a, 16b, 16c, 16d fuel orifice
18,24 fuel feed passage
23 longitudinal furrows (ditch portion)
26 needle-valves
27 fuel oils import space
44 guiding valves
Claims (7)
1. a fuel injection system, it has:
Shell, its inside is formed with fuel feed passage, and front end is formed with fuel orifice;
Needle-valve, it is configured in described enclosure, fuel feed passage according to fuel pressure opening and closing;
Guiding valve, it is arranged on the front end of described needle-valve, and outer circumferential face contacts with the inner peripheral surface of described shell and slides;
Ditch portion, it is formed at positions different from described fuel orifice in the inner peripheral surface of described shell, is communicated with described fuel feed passage;
Described guiding valve is formed with fuel oil and imports space from its fuel oil circulated,
When described fuel feed passage is open, described fuel oil imports space and is communicated with described ditch portion, and described fuel oil imports space and moves to the position be communicated with described fuel orifice,
When described fuel feed passage is closed, the outer circumferential face of described guiding valve is towards described fuel orifice, and described fuel oil imports space and moves to position disconnected with described fuel orifice.
2. fuel injection system according to claim 1, wherein, the upper periphery face of described guiding valve, when described fuel feed passage carries out on-off action, contacts with the inner peripheral surface of described shell all the time.
3. fuel injection system according to claim 1 and 2, wherein, described fuel oil imports space and is formed as ring-type at described guiding valve.
4. the fuel injection system according to any one of claims 1 to 3, wherein, described fuel orifice is axially provided with epimere fuel orifice and hypomere fuel orifice at described shell,
The fuel feed passage of the space supply fuel for the below to described guiding valve is formed in described guiding valve inside,
When described fuel feed passage is open, described fuel oil imports space and is communicated with described ditch portion, and, described fuel oil imports space and moves to the position be communicated with described epimere fuel orifice, simultaneously, the space of the below of described guiding valve is communicated with described ditch portion, and the space of the below of described guiding valve is communicated with described hypomere fuel orifice.
5. the fuel injection system according to any one of Claims 1 to 4, wherein, be formed with multiple described ditch portion at the inner peripheral surface of described shell, multiple described ditch portions are arranged on the inner peripheral surface of described shell with the spacing of equalization.
6. the fuel injection system according to any one of Claims 1 to 5, wherein, described ditch portion and described fuel orifice, keep the spacing of more than the bore of described fuel orifice and formed.
7. a diesel engine, is characterized in that, cylinder head possesses the fuel injection system according to any one of claim 1 ~ 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-074209 | 2013-03-29 | ||
| JP2013074209A JP5955258B2 (en) | 2013-03-29 | 2013-03-29 | Fuel injection device and diesel engine |
| PCT/JP2014/058446 WO2014157297A1 (en) | 2013-03-29 | 2014-03-26 | Fuel injection device and diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104903569A true CN104903569A (en) | 2015-09-09 |
| CN104903569B CN104903569B (en) | 2017-09-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480004083.XA Active CN104903569B (en) | 2013-03-29 | 2014-03-26 | Fuel injection device and diesel engine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2927474B1 (en) |
| JP (1) | JP5955258B2 (en) |
| KR (1) | KR101726527B1 (en) |
| CN (1) | CN104903569B (en) |
| WO (1) | WO2014157297A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105508310A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Aviation fuel jet pump capable of sucking fuel from double ends |
| CN113833592A (en) * | 2021-09-30 | 2021-12-24 | 潍柴动力股份有限公司 | Injection valve subassembly, engine and vehicle |
| CN115163366A (en) * | 2022-06-29 | 2022-10-11 | 浙江联控技术有限公司 | Fuel injector sealing structure, methanol engine fuel injector and vehicle |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101638815B1 (en) * | 2016-01-07 | 2016-07-25 | 한빛정공(주) | Injection valve for 4 stroke engine |
| JP6668079B2 (en) * | 2016-01-12 | 2020-03-18 | 日立オートモティブシステムズ株式会社 | Fuel injection device |
| US11293392B2 (en) * | 2019-02-20 | 2022-04-05 | Ford Global Technologies, Llc | Methods and systems for a fuel injector |
| DK181318B1 (en) * | 2022-02-18 | 2023-08-10 | Man Energy Solutions Filial Af Man Energy Solutions Se Tyskland | A fuel valve for a large turbocharged two-stroke uniflow crosshead internal combustion engine |
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| JP2002242798A (en) * | 2001-02-16 | 2002-08-28 | Mitsubishi Heavy Ind Ltd | Fuel injection valve for diesel engine |
| CN1727665A (en) * | 2004-07-29 | 2006-02-01 | 株式会社电装 | Fuel injection valve having small sized structure |
| JP2010512484A (en) * | 2006-12-15 | 2010-04-22 | マーン・ディーゼール・フィリアル・アーエフ・マーン・ディーゼール・エスエー・ティスクランド | Fuel injector for internal combustion engines |
| JP2011236887A (en) * | 2010-05-11 | 2011-11-24 | Waertsilae Switzerland Ltd | Fuel injector for internal combustion engine |
| KR20120004911A (en) * | 2010-07-07 | 2012-01-13 | 바르질라 스위츠랜드 리미티드 | A fuel injector for internal combustion engines |
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| KR101148683B1 (en) * | 2010-06-07 | 2012-05-21 | 현대중공업 주식회사 | Dual fuel injector valve by hybrid nozzle with dual fuel injection valve for diesel and gas engine |
| JP5798898B2 (en) | 2011-11-24 | 2015-10-21 | 三菱重工業株式会社 | Fuel injection device |
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2013
- 2013-03-29 JP JP2013074209A patent/JP5955258B2/en active Active
-
2014
- 2014-03-26 EP EP14774505.3A patent/EP2927474B1/en active Active
- 2014-03-26 WO PCT/JP2014/058446 patent/WO2014157297A1/en active Application Filing
- 2014-03-26 KR KR1020157018592A patent/KR101726527B1/en active IP Right Grant
- 2014-03-26 CN CN201480004083.XA patent/CN104903569B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002242798A (en) * | 2001-02-16 | 2002-08-28 | Mitsubishi Heavy Ind Ltd | Fuel injection valve for diesel engine |
| CN1727665A (en) * | 2004-07-29 | 2006-02-01 | 株式会社电装 | Fuel injection valve having small sized structure |
| JP2010512484A (en) * | 2006-12-15 | 2010-04-22 | マーン・ディーゼール・フィリアル・アーエフ・マーン・ディーゼール・エスエー・ティスクランド | Fuel injector for internal combustion engines |
| JP2011236887A (en) * | 2010-05-11 | 2011-11-24 | Waertsilae Switzerland Ltd | Fuel injector for internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105508310A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Aviation fuel jet pump capable of sucking fuel from double ends |
| CN113833592A (en) * | 2021-09-30 | 2021-12-24 | 潍柴动力股份有限公司 | Injection valve subassembly, engine and vehicle |
| CN115163366A (en) * | 2022-06-29 | 2022-10-11 | 浙江联控技术有限公司 | Fuel injector sealing structure, methanol engine fuel injector and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2927474B1 (en) | 2016-12-28 |
| KR20150092326A (en) | 2015-08-12 |
| EP2927474A4 (en) | 2016-01-20 |
| EP2927474A1 (en) | 2015-10-07 |
| WO2014157297A1 (en) | 2014-10-02 |
| KR101726527B1 (en) | 2017-04-12 |
| JP2014199021A (en) | 2014-10-23 |
| CN104903569B (en) | 2017-09-01 |
| JP5955258B2 (en) | 2016-07-20 |
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Effective date of registration: 20170814 Address after: Japan's Tokyo port harbor two chome 16 No. 5 Applicant after: Mit-subishi Heavy Industries Ltd. Applicant after: Japan motor Limited by Share Ltd Address before: Japan's Tokyo port harbor two chome 16 No. 5 Applicant before: Mit-subishi Heavy Industries Ltd. |