CN109026482A - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- CN109026482A CN109026482A CN201810495563.0A CN201810495563A CN109026482A CN 109026482 A CN109026482 A CN 109026482A CN 201810495563 A CN201810495563 A CN 201810495563A CN 109026482 A CN109026482 A CN 109026482A
- Authority
- CN
- China
- Prior art keywords
- fuel
- spring
- injector
- needle
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
The invention discloses a kind of fuel injector (100).Fuel injector (100) includes injector body (102), is assembled to injector body (102) and including the nozzle assembly (104) for one or more openings by fuel draining into combustion chamber.Fuel injector (100) is characterized in that the spring (106) in injector body (102), spring (106) have at least one of variable coil diameter and variable pitch for controlling the fuel quantity sprayed into combustion chamber based on engine running condition.
Description
Technical field
The present invention relates to fuel injectors.
Background technique
Fuel injector (10) is for by the weight in the fuel injection system in the combustion chamber of fuel injection to engine
Want component.Fig. 1 shows the cross-sectional view of fuel injector (10) according to prior art.Fuel injector (10) includes being formed
The injector body (12) of the external covering part of fuel injector (10).Fuel injector (10) further includes being assembled to injector master
The nozzle assembly (14) of body (12).Nozzle assembly (14) includes nozzle body (14a) and needle (14b).Needle (14b) is placed on nozzle
In main body (14a).Nozzle body (14a) includes for one or more holes of atomised form injection fuel.Spring (16) is put
Set in the injector body (12), by make open position and closed position of the nozzle needle (14b) in nozzle body (14a) it
Between promoted, spray-hole can be opened and closed.Fuel injector (10) has entrance (18), and fuel enters spray by entrance (18)
In nozzle chamber in mouth main body (14a).With the increase of the intracorporal fuel pressure of nozzle chambers, nozzle needle (14b) is elevated.
According to US5769319, a kind of closed-nozzle fuel injector comprising injector body, the injector body packet
Cavity containing injector, the injector cavity include nozzle chamber and are connected to one end of the nozzle chamber to arrive fuel draining
Injector aperture in combustion chamber；It is located in nozzle chamber adjacent to the nozzle valve element in injector aperture；And for changing
The rate-shaping control concept of the fuel flow rate in the flexible excessively described injector aperture, the rate-shaping control mechanism include whole
The throttle passage being formed in the nozzle needle element, for limiting the flowing of fuel to the nozzle chamber thus to change
Become the increased rate of fuel pressure in the nozzle chamber.
Summary of the invention
It is an object of the present invention to provide a kind of fuel injector, which includes injector body；Nozzle assembly,
The nozzle assembly is assembled to injector body and including for one or more opening by fuel injection into combustion chamber.It should
Fuel injector is characterized in that the spring in injector body, which has in variable coil diameter and variable pitch
At least one to spray fuel quantity into combustion chamber for controlling based on engine running condition.
In one embodiment, the spring in the fuel injector is preloaded.
Detailed description of the invention
Fig. 1 is the cross-sectional view of fuel injector according to prior art;
Fig. 2 is the cross-sectional view of fuel injector according to one embodiment of the present disclosure;
Fig. 3 is shown according to prior art according to the curve graph of the amount of injection of engine speed variation;And
Fig. 4 is the curve graph for showing the amount of injection according to engine speed variation of the embodiment according to present disclosure.
Specific embodiment
Fig. 2 is the cross-sectional view of fuel injector (100) according to one embodiment of the present disclosure;
Fuel injector (100) includes injector body (102)；Nozzle assembly (104), the nozzle assembly are assembled to injector master
Body (102) and including for one or more into combustion chamber of fuel injection to be open.The feature of fuel injector (100)
The spring (106) being in injector body (102), spring (106) have in variable coil diameter and variable pitch at least
One for controlling the fuel quantity sprayed into combustion chamber based on engine running condition.
The structure of fuel injector (100) is described in detail in following paragraph.
Injector body (102) forms the outer covering piece of fuel injector (100).Injector body (102), which has, to be accommodated
The cavity (102a) of the other component of fuel injector (100), is described in the following paragraphs.
Fuel injector (100) further includes the nozzle assembly (104) for being assembled to injector body (102).Nozzle assembly
It (104) include nozzle body (104a), nozzle chamber (104b) and needle (104c).Needle (104c) is placed on nozzle chamber (104b)
It is interior.Nozzle body (104a) includes one or more apertures for being connected to combustion chamber fluid for will be present in nozzle chamber
Fuel injection in (104b) is into combustion chamber.Needle (104c) can move so that aperture is beaten in nozzle chamber (104b)
It is open and close.
Entrance (108) is contained in injector body (102) with for will be by pressure piping from the received height of petrolift
Pressurized fuel is discharged into nozzle chamber (104b).
Nozzle assembly (104) includes screw thread on its inner surface so that nozzle assembly (104) use is threadedly engaged mechanism
It is assembled to injector body (102).
Fuel injector (100) is characterized in that the spring (106) in injector body (102).That is, spring
(106) it is placed in the cavity (102a) of injector body (102).During fuel injection, spring (106) promotes needle (104c)
Movement in nozzle chamber (104b) between open and closed positions.Moreover, when nozzle assembly (104) use screw thread
When matching mechanism is assembled to injector body (102), spring (106) is preloaded.
In one embodiment, the characteristic of spring (106) is so that it has variable coil diameter, and uniform wire rod is straight
Diameter and uniform pitch.Coil diameter refers to the diameter of the coil in spring.The quantity for the coil being present in spring is based on down
State factor restriction: such as, needle lift, required fuel injection amount and spring rate etc..Variable coil diameter refers to spring
In one or more coils relative to the modified diameter of other coils in spring.According to this embodiment, spring (106)
Top and bottom at coil diameter be less than towards the center of spring (106) coil diameter.It should be noted that root
According to the embodiment, the coil diameter of spring (106) changes in the range of 3.5 mm to 7.0 mm.Gauge or diameter of wire refers to spring
(106) diameter of wire rod.Pitch refers to the distance between any two coil in spring (106).Uniform pitch refers to line
The distance between circle is identical.
In another embodiment, the characteristic of spring (106) is so that it has variable pitch, uniform coil diameter
With uniform gauge or diameter of wire.Variable pitch refers to that the distance between coil is different relative to each other, and uniform coil is straight
Diameter refers to that the coil diameter of each coil in spring is identical.In this embodiment, the pitch of the top and bottom of spring (106)
Less than the pitch towards the center of spring (106).The value of pitch changes in the range of 1 mm to 2 mm according to this embodiment.
However, it is necessary to pitch value be distributed relative to each coil, so that the total length of spring (106) remains and is approximately equal to 27.2
mm。
In yet another embodiment, the characteristic of spring (106) is so that it has variable coil diameter and variable section
Away from the two and uniform gauge or diameter of wire.It should be noted that gauge or diameter of wire is uniform in all three embodiments.
Fuel injector (100) further includes the cavity for being placed on spacer (112) and being located at injector body (102)
Compression bolts (110) in (102a).Compression bolts (110) are also used for keeping spring (106) at one end and for needle
The translational motion of (104c) to spring (106).Spacer (112) is located between injector body (102) and nozzle assembly.Interval
Part (112) is used to limit the maximum lift of needle (104c).
The working condition of fuel injector (100) is described in detail in following paragraph.
Fuel utilization petrolift pressurization from fuel tank.Pressurized fuel is transported to fuel injector (100).Pressurization combustion
Material passes through entrance (108) flow nozzle cavity (104b).Therefore, pressurized fuel accumulates in nozzle chamber (104b).With spray
Accumulation in mouth cavity (104b) occurs, pressurized fuel applied force on needle (104c).So, needle (104c) tends to apply
Fight the power of spring force.When the pressure applied by pressurized fuel is beyond the spring force preloaded, spring (106) compression and needle
(104c) is promoted, and is thus opened and is present in the aperture in nozzle chamber (104b).When aperture is opened, pressurized fuel is injected into
In combustion chamber.
When needle (104c) is promoted, since there are spacers between injector body (102) and nozzle body (104a)
(112), needle (104c) can move the bottom surface until needle (104c) arrival interval part (112).This controls needle lift
(needle lift).Needle lift is pointer (104c) distance mobile to open position from closed position.In Fig. 2, needle is in
Closed position.Needle (104c) obtains maximum lift in the bottom surface of the top surface arrival interval part (112) of needle (104c).
Needle guiding piece (104d) moves in compression bolts (110).
When needle (104c) overcomes spring force to be promoted, spring (106) starts to compress.Due to spring (106) have it is variable
Coil diameter and variable pitch, therefore for specific engine running condition, needle (104c) overcomes the speed of spring force promotion
Rate variation.This rate is also defined as the speed of needle (104c) promotion.This variation for the rate that needle (104c) is promoted causes
Spray the variation of the fuel quantity into combustion chamber.For specific engine running condition, in a control unit using storage
The known required fuel quantity of mapping.Therefore, the distance of required needle (104c) to be hoisted is so that pass through fuel injector (100)
The aequum of the fuel of injection is also known.It should be noted that needle (104c) overcomes spring by using spring (106)
The rate that power is elevated changes the specific engine running condition, however, the height that needle (104c) is elevated is for this
Specific engine running condition keeps identical.In other words, the time spent in needle (104c) is thus lifted to the certain height by
Change in spring (106).
Therefore, there is the spring (106) of variable coil diameter and variable pitch needle (104c) to be caused to overcome spring force
The variable bit rate of promotion.When compared with the spring well known in the prior art that there is uniform coil diameter and uniformly solve
When, this variable bit rate of needle lift causes the variation for the fuel quantity being injected into combustion chamber.Specific engine is transported
Row situation, the variation of fuel injection amount lead to the fuel consumption of reduced discharge and reduction.It describes in detail and is sprayed in conjunction with Fig. 3
It is incident upon the variation of the fuel quantity in combustion chamber.
Fig. 3 and Fig. 4 is the curve graph for showing the amount of injection changed according to engine speed.
Fig. 3 is shown according to prior art according to the curve graph of the amount of injection of engine speed variation.Here, fuel sprays
Emitter (10) includes the spring (16) with uniform coil diameter, uniform pitch and uniform gauge or diameter of wire.According to Fig. 3 institute
The curve graph shown, X-axis indicates the needle lift of fuel injector (10), and Y-axis indicates the fuel quantity being injected into combustion chamber.
As described above, needle (14b) can move between a closed position and a open position.Needle lift is defined as needle
The height that (14b) is promoted relative to closed position.
Fuel quantity into combustion chamber is sprayed to be within cc/30 second (every 30 seconds of cubic centimetre) that unit indicates and needle lift
It indicates in millimeters.
Curve graph according to Fig.3, slope (302) indicate between needle lift and the fuel quantity sprayed into combustion chamber
Linear relationship.That is, then fuel quantity of the injection into combustion chamber is more as gynophore lift is high.
Quilt of the graphical representation shown in Fig. 4 relative to the needle lift of the fuel injector (100) with spring (106)
The fuel quantity of injection, the spring (106) have at least one of variable coil diameter and variable pitch for being based on
Engine running condition sprays fuel quantity into combustion chamber to control.X-axis indicates needle lift, and table in millimeters
Show.Y-axis indicates fuel quantity of the injection into combustion chamber, and is indicated as unit of cc/30 seconds.
Curve graph (402) indicates the relationship between the fuel quantity sprayed and needle lift.In curve graph (402), sprayed
Relationship between the fuel quantity penetrated and needle lift is nonlinear.Due to for specific engine running condition (speed and turn
Square) needle lift variable bit rate, therefore obtain this non-linear.This is by using having variable coil diameter or can
The pitch or both coil diameter and pitch of change substantially variable spring (106) and obtain.Since spring (106) have
There are variable coil diameter and variable pitch, so generating this variable bit rate of needle lift.The variable bit rate of needle lift is led
Cause the reduction of the fuel quantity of injection.This reduction of the fuel quantity of injection leads to the fuel consumption of reduced discharge and reduction.Cause
This, is for specific engine running condition, the fuel quantity for limiting needle lift in advance and being sprayed for the needle lift.Pass through
Using the spring (106) with variable coil diameter and variable pitch, the variable bit rate of needle lift is generated, spray is thus changed
The fuel quantity being incident upon in combustion chamber.However, for the specific engine running condition, height (needle that needle (104c) is promoted
Lift) still maintain identical.That is, in other words, the speed that needle (104c) is promoted runs the specific engine
Changed condition.
Therefore, present disclosure discloses a kind of fuel injector (100), it is characterised in that has variable coil diameter
With the spring (106) of variable pitch.Needle lift by using this spring (106), for specific engines operation conditions
Rate variation.This variable bit rate of needle lift causes to spray the variation of the fuel quantity into combustion chamber.Moreover, passing through acquisition
The variable bit rate of needle lift, the fuel quantity sprayed into combustion chamber are reduced.Therefore, avoid cause it is increased discharge and it is increased
The excessive fuel injection of fuel consumption.Therefore, fuel injector disclosed in present disclosure (100) realizes reduced row
It puts and the fuel consumption of reduction.
It should be understood that the embodiment explained in the above description is merely illustrative and does not limit the present invention
Range.It is contemplated that type, many such embodiments of the type of nozzle assembly about injector body.Model of the invention
It encloses and is limited solely by the scope of the following claims.
Claims (2)
1. a kind of fuel injector (100), the fuel injector (100) include:
Injector body (102);
Nozzle assembly (104), the nozzle assembly (104) are assembled to the injector body (102) and including for that will fire
One or more openings of the material injection into combustion chamber；
It is characterized in that,
Spring (106) in the injector body (102), the spring (106) have variable coil diameter and variable
At least one of pitch is for controlling the fuel quantity being injected into the combustion chamber based on engine running condition.
2. fuel injector (100) according to claim 1, wherein the spring (106) is preloaded.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN201741018052 | 2017-05-23 | ||
| IN201741018052 | 2017-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109026482A true CN109026482A (en) | 2018-12-18 |
| CN109026482B CN109026482B (en) | 2023-04-28 |
Family
ID=64611414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810495563.0A Active CN109026482B (en) | 2017-05-23 | 2018-05-22 | Fuel injector |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109026482B (en) |
| BR (1) | BR102018010372A2 (en) |
| RU (1) | RU2769207C2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1452479A (en) * | 1973-02-22 | 1976-10-13 | Cav Ltd | Fuel injection nozzle units for internal combustion engines floating wick holder |
| US20040089743A1 (en) * | 2002-10-24 | 2004-05-13 | Charles Tilton | Actuated atomizer |
| CN102529931A (en) * | 2010-11-08 | 2012-07-04 | 罗伯特·博世有限公司 | Valve return spring with filter support for a pneumatic brake booster assembly |
| JP2014015857A (en) * | 2012-07-06 | 2014-01-30 | Hitachi Automotive Systems Ltd | Electromagnetic fuel injection valve |
| CN204941759U (en) * | 2015-09-01 | 2016-01-06 | 潍坊力创电子科技有限公司 | Buffer type gas injection valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5871155A (en) * | 1997-06-10 | 1999-02-16 | Caterpillar Inc. | Hydraulically-actuated fuel injector with variable rate return spring |
| RU2290527C1 (en) * | 2005-05-03 | 2006-12-27 | Государственное образовательное учреждение профессионального образования "Алтайский государственный университет" | Nozzle for internal combustion engine |
| JP6476998B2 (en) * | 2015-02-25 | 2019-03-06 | 株式会社デンソー | Fuel injection device |
-
2018
- 2018-05-22 CN CN201810495563.0A patent/CN109026482B/en active Active
- 2018-05-22 BR BR102018010372-5A patent/BR102018010372A2/en unknown
- 2018-05-22 RU RU2018118831A patent/RU2769207C2/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1452479A (en) * | 1973-02-22 | 1976-10-13 | Cav Ltd | Fuel injection nozzle units for internal combustion engines floating wick holder |
| US20040089743A1 (en) * | 2002-10-24 | 2004-05-13 | Charles Tilton | Actuated atomizer |
| CN102529931A (en) * | 2010-11-08 | 2012-07-04 | 罗伯特·博世有限公司 | Valve return spring with filter support for a pneumatic brake booster assembly |
| JP2014015857A (en) * | 2012-07-06 | 2014-01-30 | Hitachi Automotive Systems Ltd | Electromagnetic fuel injection valve |
| CN204941759U (en) * | 2015-09-01 | 2016-01-06 | 潍坊力创电子科技有限公司 | Buffer type gas injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| BR102018010372A2 (en) | 2018-12-18 |
| RU2018118831A3 (en) | 2021-09-15 |
| RU2018118831A (en) | 2019-11-22 |
| RU2769207C2 (en) | 2022-03-29 |
| CN109026482B (en) | 2023-04-28 |
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