CN209469527U - A kind of electronic fuel injection and the fuel injector including it - Google Patents
A kind of electronic fuel injection and the fuel injector including it Download PDFInfo
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- CN209469527U CN209469527U CN201920023749.6U CN201920023749U CN209469527U CN 209469527 U CN209469527 U CN 209469527U CN 201920023749 U CN201920023749 U CN 201920023749U CN 209469527 U CN209469527 U CN 209469527U
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- 239000000446 fuel Substances 0.000 title claims abstract description 52
- 238000002347 injection Methods 0.000 title claims abstract description 42
- 239000007924 injection Substances 0.000 title claims abstract description 42
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005868 electrolysis reaction Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 208000035874 Excoriation Diseases 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- -1 gapless leakage Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a kind of electronic fuel injection and including its fuel injector, belong to internal combustion engine field.The electronic fuel injection includes needle-valve and needle-valve body, and the needle-valve is socketed in the mesoporous of the needle-valve body, and the top surface of the needle-valve is used to connect with control plunger；The upper section of the needle-valve, its end protrudes from the needle-valve body upper surface, is guide end with needle-valve body upper section inner wall contact portion, offers longitudinal groove on the needle-valve guide section outer wall, the longitudinal groove and needle-valve body upper section inner wall form oil passage, pass through for high pressure oil.The atomizer of the utility model eliminates oil hole and oil holding slot design, by will be set in fuel injection chamber, oil passage is formed by longitudinal groove and needle-valve body inner wall, to adapt to passing through for high pressure oil, a kind of injector nozzle matching parts as no oil return, energy loss is reduced, can satisfy the requirement of fuel injection system product up-gradation, 2000bar-3000bar is adapted to and sprays pressure demand.
Description
Technical field
The utility model relates to internal combustion engine fields, more particularly to a kind of electronic control injection suitable for high injection pressure
Mouth and fuel injector including it.
Background technique
Requirement with energy consumption and emission regulation is more and more stringent, and compression ignition engine is to the atomizer in fuel injection system
It is proposed requirements at the higher level.It is mainly reflected in following aspect:
High-pressure injection: design object pressure reaches 2000bar or more, and subsequent upgrade pressure is up to 3000bar.
Accurate injection: the requirement of " timing ", " quantitative " accuracy of spray is higher, and injection scattered error is small, between the multi-injection stable time
Every short, jetting stability is good.
Low energy losses: avoiding static leakage from losing in the design of atomizer, reduces dynamic leakage loss, thus reduces pump
System energy consumption is to reduce the energy loss of fuel injection system.
High reliability: product is subjected to higher pressure pulse, and shock resistance fatigue failure risk is low, good airproof performance, cavitation erosion
Risk is low, abrasion is small etc..
Other require low such as processing cost, homogeneity of product, product inheritance etc. to have requirements at the higher level.
The primary structure of existing fuel injector is as shown in Figure 1.This kind of fuel injector is produced in 1400bar-1600bar fuel injector
It is widely applied on product.
But it is directed to 2000bar-3000bar fuel injector, with index requests such as injection pressure, accuracy of spray and energy losses
It improves, product faces optimization and upgrading, is mainly in particular in:
1) needle-valve and needle-valve body guide surface category are slidably matched face, and can be significant with injection its gap leakage flow rate of pressure rise
Increase, thus the energy loss of fuel system can be caused big.
2) demand of the higher injection pressure to product structure reliability and sealing performance is prominent.
3) there are stress concentrations in the grinding of needle-valve body shape.
4) needle-valve and plunger separate, and energy loss is big, thereby increases and it is possible to control failure occur.
That it is necessary to provide a kind of energy losses is small, product reliability is high, is more suitable for 2000bar-3000bar injection pressure
The atomizer of demand.
Utility model content
That the technical problem to be solved by the present invention is to provide a kind of energy losses is small, product reliability is high, is more suitable for
2000bar-3000bar sprays the electronic fuel injection of pressure demand and the fuel injector including it.
In order to solve the above technical problems, the technical scheme that the utility model is provided is as follows:
On the one hand, the utility model provides a kind of electronic fuel injection, including needle-valve and needle-valve body, and the needle-valve is socketed in institute
It states in the mesoporous of needle-valve body, the top surface of the needle-valve is used to connect with control plunger；The upper section of the needle-valve, end protrude from
The needle-valve body upper surface is guide end with needle-valve body upper section inner wall contact portion, offers on the needle-valve guide section outer wall
Longitudinal groove, the longitudinal groove and needle-valve body upper section inner wall form oil passage, pass through for high pressure oil.
Further, the physical clearance of the needle-valve body inner wall and needle-valve is 5~15 μm.
Further, the upper surface of the needle-valve body is inner is equipped with boss, and it is recessed right that the boss is used to carry out with fuel injector
Convex line sealing.
Further, on the upper surface of needle-valve body, dowel hole is equipped in the outside of the boss.
Further, it in the middle section periphery of the needle-valve body, is constituted in stair-stepping positioned at the omoplate face in middle section and with it
The intersection of portion's outer wall is equipped with annular groove.
Further, the omoplate face uses 89 ° of concave inward structures.
Further, electrolysis escape is equipped in the middle part of the inner cavity of the needle-valve body.
Further, the cross sectional shape of the longitudinal groove is arc.
Further, the quantity of the longitudinal groove is three or four, is evenly distributed on needle-valve.
Further, the needle valve seat surface of the needle-valve bottom uses step needle construction, and sealing intersection angle angle is
1.08°。
On the other hand, a kind of fuel injector is provided, including the electronic fuel injection.
Further, the top surface of the needle-valve and control stick harness welding.
By adopting such a design, the utility model at least has the following advantages:
The atomizer of the utility model eliminates oil hole and oil holding slot design, by will set in fuel injection chamber, passes through longitudinal direction
Groove and needle-valve body inner wall form oil passage, and Lai Shiying high pressure oil passes through, and become a kind of injector nozzle matching parts of no oil return, drop
Low energy loss, can satisfy the requirement of fuel injection system product up-gradation, and adapting to 2000bar-3000bar injection pressure needs
It asks, and has that fast response time, pressure oscillation is small for injection, gapless leakage, product and production inheritance is good, production technology
Simply, the advantages that at low cost.
Detailed description of the invention
Above-mentioned is only the general introduction of technical solutions of the utility model, in order to better understand the technology hand of the utility model
Section, below in conjunction with attached drawing, the utility model is described in further detail with specific embodiment.
Fig. 1 is the structural schematic diagram of an atomizer of the prior art, and 1 ' is needle-valve, and 2 ' be needle-valve body；
Fig. 2 is the axial schematic cross-sectional view of the atomizer of the utility model；
Fig. 3 is the overlooking structure diagram of the atomizer of the utility model；
Fig. 4 is the needle valve seat surface third hand tap structural schematic diagram of the utility model；
Fig. 5 is the needle valve seat surface double cone structure schematic diagram of the utility model.
Specific embodiment
The exemplary embodiment of the utility model is more fully described below with reference to accompanying drawings.Although showing this in attached drawing
The exemplary embodiment of utility model, it being understood, however, that may be realized in various forms the utility model without should be by here
The embodiment of elaboration is limited.It is to be able to thoroughly understand the utility model, and energy on the contrary, providing these embodiments
It is enough that the scope of the utility model is communicated completely into those skilled in the art.
The utility model provides a kind of embodiment of electronic fuel injection, as shown in Figures 2 to 5, including needle-valve 1 and needle-valve body
2, needle-valve 1 is socketed in the mesoporous 4 of needle-valve body 2, and the top surface 15 of needle-valve 1 is used to connect with control plunger；The upper section of needle-valve 1,
End protrudes from 2 upper surface of needle-valve body, is guide end with 2 upper section inner wall contact portion of needle-valve body, opens on needle-valve guide section outer wall
Equipped with longitudinal groove 3, longitudinal groove 3 and 1 upper section inner wall of needle-valve body form oil passage 9, pass through for high pressure oil.
When the utility model is used, being connect with the fuel injector set in control chamber, due to eliminating oil hole and oil holding slot
Design, the outer wall of needle-valve guide section offer in longitudinal groove (can be symmetrical three or four arc grooves) and needle-valve body
Hole group camber oil passage is formed without static oil-returning structure, and oil passage can support high pressure oil no pressure to lose, and reduce energy
Amount loss, and between needle-valve and needle-valve body can there are physical clearance, cancel needle-valve and needle-valve body with pair, needle-valve and needle-valve body
It mainly play the guiding role, and the coating of common rail needle-valve periphery can be cancelled, reduce cost, can satisfy fuel injection system product
The requirement of upgrading, adapt to 2000bar-3000bar spray pressure demand, and have fast response time, injection pressure oscillation it is small,
The advantages that gapless is revealed, product and production inheritance are good, production technology is simple, at low cost.
The atomizer course of work is summarized as follows:
1 top of needle-valve controls cavity pressure and reduces, and needle-valve 1 lifts, fuel injector commencement of fuel injection.Cavity pressure is controlled to increase,
1 lift of needle-valve reduces, fuel injector end of injection.
Longitudinal groove and mesoporous on needle-valve use grinding, and roughness is skillful in former depth drill processing oil duct hole
Ra1.6 precision is more advantageous to passing through for high pressure oil no pressure loss.
To realize the grinding of needle-valve body mesoporous, electrolysis escape 5 is equipped in the middle part of the inner cavity of needle-valve body 2.Electrolysis escape can be kept away
The burr for exempting from Vehicle Processing technology groove, because electrolysis time is short, cost is relatively low.Electrolysis escape is located at needle-valve body and corresponds to needle-valve guide section
Pilot hole below, being electrolysed escape than the escape of lathe process has impulse- free robustness accumulation, and easy processing and fuel flow field are more smooth
The advantages that.
Further, the quantity of longitudinal groove 3 is generally three or four, is evenly distributed on needle-valve, oil passage
Actual internal area can be 1.97mm2, the quantity and radian size of longitudinal groove can also be adjusted according to demand.
As an improvement the cross sectional shape of longitudinal groove 3 is arc.Arc groove can preferably support high pressure oil without
The pressure loss passes through, and guarantees that 8 diameters are that the spray orifice of Φ 0.28 does not shut off, can support single injection event oil mass 550mm3/ str's
Medium and heavy fuel injector.
The needle valve seat surface 14 of needle-valve still uses step needle construction, and having three pyramidal faces structure 13 can be used in seat surface lower part, and sealing is handed over
Line angle degree angle is 1.08 °, avoids sharp angle effect, reduces Mises stress and the impact force to needle valve seat' s cone.Needle-valve bottom cone
Face 13 and needle-valve body head 14 cooperatively form sealing intersection, finally determine fuel injection processes.
In above-described embodiment, the physical clearance of 2 inner wall of needle-valve body and needle-valve 1 is 5~15 μm, cancels needle-valve and matches with needle-valve body
Pair, the mating surface between needle-valve and needle-valve body only need guide function, are not required to seal, and clamping stagnation, abrasion risk are small, cooperation required precision drop
It is low, it can cancel common rail needle-valve large cylindrical coating, 4 yuan -5 yuan of save the cost.
As an improvement the upper surface 11 of needle-valve body 2 is inner to be equipped with boss 12, boss 12 is used to carry out with fuel injector recessed
Convex line is sealed.Boss seals convex line by using recessed using 8.5 boss of Φ, boss and fuel injector, reduced sealing plane
Only 37mm2, sealing area reduction is conducive to end face seal, and is not provided with positioning pin on sealing plane (the corresponding position of boss)
Hole, oil hole reduce cross grinding burr, are more advantageous to end face seal.And dowel hole 10 is located at the upper of the outside of boss 13
On end face 11, the inheritance of product ensure that.
In order to avoid stress concentration, in the middle section periphery of needle-valve body 2, ladder is constituted positioned at the omoplate face 6 in middle section and with it
The intersection of the middle part outer wall 8 of shape is equipped with annular groove 7.
It is altered to solve the problems, such as that fuel injector gas in burning returns, omoplate face 6 uses 89 ° of concave inward structures, the inside with tight cap
Step surface realizes linear sealing.
On the other hand, a kind of fuel injector is provided, including above-mentioned electronic fuel injection.
Further, the top surface of needle-valve 1 and control stick harness welding.It controls plunger and needle-valve top surface is welded, become weld part
Part can guarantee the needle-valve opening time, and can be reduced needle-valve and control plunger unlatching risk.Reduce fuel injector number of components,
Assembly difficulty reduces between component, makes that structure is simple, good manufacturability.
The atomizer of the utility model is made of needle-valve and needle-valve body, and needle-valve is slender rod piece structure, needle-valve upper section
Arc groove and needle-valve body inner wall cylindrical surface group camber oil passage, the mating surface play be oriented between needle-valve and needle-valve body simultaneously
Effect；And since fit clearance is big (5-15um), eliminates needle-valve and matching for needle-valve body pays, greatly reduce with Fu Chengben.Spray
Oily body bottom surface contacts to form matching trim with needle-valve body top surface, and is screwed by tight cap, realizes the sealing of contact surface.Tight cap
By its interior step face and needle-valve body omoplate face contact, linear sealing is formed.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above,
It falls within the protection scope of the present utility model.
Claims (10)
1. a kind of electronic fuel injection, which is characterized in that including needle-valve and needle-valve body, the needle-valve is socketed in the needle-valve body
In hole, the top surface of the needle-valve is used to connect with control plunger；
The upper section of the needle-valve, end protrude from the needle-valve body upper surface, are to lead with needle-valve body upper section inner wall contact portion
Xiang Duan, longitudinal groove is offered on the guide section outer wall of the needle-valve, and the longitudinal groove and needle-valve body upper section inner wall were formed
Oily channel, passes through for high pressure oil.
2. electronic fuel injection according to claim 1, which is characterized in that the physical clearance of the needle-valve body inner wall and needle-valve
It is 5~15 μm.
3. electronic fuel injection according to claim 1, which is characterized in that the upper surface of the needle-valve body is inner equipped with convex
Platform, the boss are used to carry out with fuel injector recessed to convex line sealing.
4. electronic fuel injection according to claim 3, which is characterized in that on the upper surface of needle-valve body, in the boss
Outside be equipped with dowel hole.
5. electronic fuel injection according to claim 1, which is characterized in that in the middle section periphery of the needle-valve body, be located at
The omoplate face of section and the intersection that stair-stepping middle part outer wall is constituted with it are equipped with annular groove.
6. electronic fuel injection according to claim 5, which is characterized in that the omoplate face uses 89 ° of concave inward structures.
7. electronic fuel injection according to any one of claims 1 to 6, which is characterized in that set in the middle part of the inner cavity of the needle-valve body
There is electrolysis escape.
8. electronic fuel injection according to any one of claims 1 to 6, which is characterized in that the cross sectional shape of the longitudinal groove
For arc；
And/or the quantity of the longitudinal groove is three or four, is evenly distributed on needle-valve；
And/or the needle valve seat surface of the needle-valve bottom uses step needle construction, sealing intersection angle angle is 1.08 °.
9. a kind of fuel injector, which is characterized in that including any electronic fuel injection of claim 1 to 8.
10. fuel injector according to claim 9, which is characterized in that the top surface of the needle-valve and control stick harness welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920023749.6U CN209469527U (en) | 2019-01-08 | 2019-01-08 | A kind of electronic fuel injection and the fuel injector including it |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920023749.6U CN209469527U (en) | 2019-01-08 | 2019-01-08 | A kind of electronic fuel injection and the fuel injector including it |
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| CN209469527U true CN209469527U (en) | 2019-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
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- 2019-01-08 CN CN201920023749.6U patent/CN209469527U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
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