CN106870230A - A kind of common-rail injector - Google Patents
A kind of common-rail injector Download PDFInfo
- Publication number
- CN106870230A CN106870230A CN201710009839.5A CN201710009839A CN106870230A CN 106870230 A CN106870230 A CN 106870230A CN 201710009839 A CN201710009839 A CN 201710009839A CN 106870230 A CN106870230 A CN 106870230A
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- CN
- China
- Prior art keywords
- needle
- valve
- boss
- pit
- control piston
- 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.)
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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
- F02M49/00—Fuel-injection apparatus in which injection pumps are driven or injectors are actuated, by the pressure in engine working cylinders, or by impact of engine working piston
- F02M49/04—Fuel-injection apparatus in which injection pumps are driven or injectors are actuated, by the pressure in engine working cylinders, or by impact of engine working piston using the piston impact
-
- 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
-
- 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
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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 invention discloses a kind of common-rail injector, including oil injector body, needle-valve, control piston and high-voltage oil cavity；Control to be evenly arranged with several boss on the bottom cylindrical week of piston；Several grooves are evenly arranged with the top end face of needle-valve, pit is provided with the needle-valve of bottom portion of groove；It is provided with the top of needle-valve with cover plate, the bottom of cover plate is provided with several cover plate boss, and cover plate top is provided with the connecting spring being connected with control piston；Each boss is respectively positioned in pit.After said structure, in fuel injection beginning, control piston upwards drive needle valve movement by bottom boss, ensure that control piston is in fit-state all the time with needle-valve pit upper surface, cover plate can pick up locking effect to the chain between control piston and needle-valve, prevent control piston base boss from being scurried out from pit.During end of injection, control piston is moved downward and drives needle valve movement, and needle-valve is taken a seat end of injection, can realize the normal work without static leakage fuel injector.
Description
Technical field
The present invention relates to a kind of internal combustion engine fuel injection system part, particularly a kind of common-rail injector.
Background technology
With the development of common rail fuel combustion system, its injection pressure more and more higher, its fuel oil static leakage problem is increasingly dashed forward
Go out, and limit the further raising of injection pressure.In order to improve injection pressure, quantity of fuel leakage is reduced, reduces energy ezpenditure,
Occur in that without static leakage type common-rail injector.Coupled face between original control piston and oil injector body, needle-valve and needle-valve body
Fuel oil static leakage will disappear, therefore fuel injector quantity of fuel leakage will greatly reduce.
But from the operation principle of common-rail injector, after solenoid valves, armature is fast in the presence of electromagnetic force
Speed is opened, because controlling the speed of valve draining（By fuel-displaced metering-orifice draining）Oil-filled rate of the hydraulic oil by fuel feed hole is far longer than,
The pressure reduction of control chamber, needle-valve heads on control piston stroking upward, commencement of fuel injection in the presence of pressure difference.For No leakage fuel injector
Inner chamber be full of by high pressure fuel completely, that is, control piston, needle-valve connection contact portion be all immersed in high pressure fuel completely.
After control chamber pressure is reduced, piston is controlled to move upwards first in the presence of hydraulic coupling.But because control
Be full of by high pressure fuel between piston and needle-valve, thus needle-valve in the presence of pressure differential cannot model- following control piston one start shipment
It is dynamic, i.e., cannot realize quick oil spout, fuel injector easily occur cannot normal work phenomenon.
The content of the invention
The technical problem to be solved in the present invention is directed to above-mentioned the deficiencies in the prior art, and provides a kind of control piston and pin
Valve fit-state is good, can realize the common-rail injector without static leakage common-rail injector normal work.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of common-rail injector, including oil injector body, the needle-valve and control piston that may be contained within oil injector body inner chamber, the pin
A high-voltage oil cavity for insertion is provided between valve, control piston and the inner surface of oil injector body；The bottom of the control piston
Several boss are evenly arranged with excircle；The first central through hole is provided with the top end face of the needle-valve, this is in first
The periphery of heart through hole is evenly arranged with several grooves, and one is provided with the needle-valve of bottom portion of groove with the first central through hole
With fluted homogeneous logical pit；The cover plate with the second central through hole is provided with the top of needle-valve, the bottom of the cover plate sets
Several cover plate boss stretched into groove are equipped with, the connecting spring being connected with control piston is provided with the top of cover plate；
Control piston is passed through from the first central through hole and the second central through hole respectively, and each described boss is respectively positioned in pit.
The quantity of the boss, groove and cover plate boss is equal, and each groove is connected with the first central through hole；Often
The individual boss can be stretched into pit from groove, each boss in pit with groove interlaced arrangement.
There is a damping clearance of 0.01 ~ 0.03mm between the control piston base end face and pit baseplane.
The height of each boss is less than the depth of pit, the distance between each boss and control piston bottom end end face
More than 0.05mm.
Between the outer surface of the control piston and the inner surface of the first central through hole and the inner surface of the second central through hole
Gap be all higher than 0.1mm.
For plane coordinates between the top of each boss and the top of pit.
The pit is circle, controls the outer surface of each boss of piston to be respectively positioned on same excircle, and this is cylindrical
The diameter 0.1mm smaller than pit internal diameter in week.
The cover plate is mainly made up of two semicircular rings, cover plate external diameter 0.2mm bigger than needle-valve top outer diameter.
Second central through hole is waist-shaped hole, and being provided with the outer surface for controlling piston can be with the straight line portion of waist-shaped hole
The flat bit architecture being engaged.
Using after said structure, the boss of above-mentioned control piston base can be engaged the present invention with the pit at the top of needle-valve,
So that control piston and needle-valve realize good fit-state；Above-mentioned cover plate can be picked up to the chain between control piston and needle-valve
Locking is acted on, and prevents control piston and needle-valve from occurring relatively rotating, and boss is scurried out from needle-valve top pit；And needle-valve, control are lived
All it is high-voltage oil cavity around the parts such as plug, cover plate, therefore pintle nozzle match-ing parts, control piston couple will be without static fuel leakages.
In fuel injection beginning, control piston upwards drive needle valve movement by bottom boss, it is ensured that control piston
Fit-state, and then atomizer oil spout are in all the time with needle-valve pit upper surface.During end of injection, control piston is moved downward simultaneously
Needle valve movement is driven, needle-valve is taken a seat end of injection, realizes the normal work without static leakage fuel injector.
Meanwhile, during end of injection, control piston and needle-valve are moved downwardly together, needle-valve contact pin sealing conical surface of valve body first
Stop motion.Control piston can effectively reduce the impulsive force to needle-valve in the effect of above-mentioned damping clearance, and then reduce to pin
The impact of sealing conical surface of valve body, increases atomizer service life.
Brief description of the drawings
Fig. 1 shows a kind of cross-sectional view of common-rail injector of the invention；
Fig. 2 shows a kind of exploded perspective schematic diagram of common-rail injector of the invention；
Fig. 3 shows the partial structural diagram of control piston in the present invention.
Wherein have：1- needle-valves；2- oil injector bodies；3- high-voltage oil cavities；4- pits；5- cover plates；6- connecting springs；7- controls are lived
Plug；8- pads；The flat bit architectures of 9-；The central through holes of 10- first；11- grooves；12- boss；13- controls piston base end face；14-
Cover plate boss；15- needle-valve bodies；The central through holes of 16- second；The semicircular rings of 17- first；The semicircular rings of 18- second.
Specific embodiment
The present invention is further detailed explanation with specific better embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of common-rail injector, including oil injector body 2, the needle-valve 1 that may be contained within the inner chamber of oil injector body 2
With control piston 7；A high-voltage oil cavity for insertion 3 is formed between needle-valve 1, control piston 7 and the inner surface of oil injector body 2, should
High pressure fuel is filled with high-voltage oil cavity 3.
As shown in Figure 1 and Figure 2, several boss 12 are evenly arranged with the bottom cylindrical week of control piston 7.Each boss
12 are all higher than 0.05mm with the distance between bottom end face of piston 7 is controlled.Each boss 12 is both preferably cube or cuboid
Structure, the top end face of each boss 12 is a plane.
As depicted in figs. 1 and 2, the first central through hole 10 is provided with the top end face of needle-valve 1, first central through hole 10
Periphery be evenly arranged with several grooves 11, each groove 11 is connected with the first central through hole 10.
Be provided with the needle-valve 1 of the bottom of groove 11 one with first central through hole 10 and fluted 11 communicate
Pit 4.Depth of the height of each above-mentioned boss 12 less than pit 4.
As depicted in figs. 1 and 2, the top of needle-valve 1 is provided with the cover plate 5 with the second central through hole 16, the bottom of the cover plate 5
Portion is provided with the cover plate boss 14 that several are stretched into groove 11, and the height of each cover plate boss 14 is respectively less than equal to groove 11
Height.The setting of cover plate boss 14, can effectively prevent cover plate 5 from rotating and sliding relatively.
Above-mentioned cover plate 5, as shown in Fig. 2 be mainly made up of two semicircular rings, respectively the first semicircular ring 17 and the second semicircle
Ring 18.In Fig. 2, for the ease of observing and understanding, the first semicircular ring 17 is flipped up.The external diameter of cover plate 5 is pushed up than needle-valve 1
The big 0.2mm of portion's external diameter, so as to facilitate the dismounting of cover plate 5.
The top of above-mentioned cover plate 5 is provided with connecting spring 6, and one end of connecting spring 6 acts on needle-valve 1 by cover plate 5, even
The other end for connecing spring 6 is acted on control piston 7 by pad 8, and the connecting spring 6 is so that it is guaranteed that cover plate 5 is pressed on needle-valve 1
On, the top planes of boss 12 of the bottom of control piston 7 is contacted with the top planes of pit 4 on needle-valve 1, and then ensure that pin
Connection between valve 1 and control piston 7.
Above-mentioned boss 12, groove 11 are equal with the quantity of cover plate boss 14, it is preferably to be 4, and circumferentially have phase
The same regularity of distribution.During each boss 12 can stretch into pit 4 from groove 11, each boss 12 interlocks in pit 4 with groove 11
Arrangement.Used as replacement, the quantity of boss 12, groove 11 and cover plate boss 14 can not also be waited, and such as the quantity of groove 11 is more than convex
Quantity of platform 12 etc., at this moment, it is only necessary to which the groove 11 that will be engaged with boss 12 is connected with the first central through hole 10.
Control piston 7 is passed through from the first central through hole 10 and the second central through hole 16 respectively, controls the outer surface of piston 7
0.1mm, compression ignition high are all higher than with the gap between the inner surface of the first central through hole 10 and the inner surface of the second central through hole 16
Oil can pass through from the gap.
Further, between there is a damping of 0.01 ~ 0.03mm between control piston base end face 13 and the baseplane of pit 4
Gap.
Further, above-mentioned pit 4 for circle, control piston 7 each boss 12 outer surface be respectively positioned on it is same cylindrical
Zhou Shang, the diameter of the excircle than the small 0.1mm of internal diameter of pit 4, such that it is able to ensure between control piston 7 and needle-valve 1 radially
Can move and be adjusted, prevent stuck.
Further, above-mentioned second central through hole 16 is waist-shaped hole, and energy and waist-shaped hole are provided with the outer surface for controlling piston 7
The flat bit architecture 9 that is engaged of straight line portion.The setting of flat bit architecture 9, can make 5 pairs of control Hes of piston 7 of cover plate at the top of needle-valve 1
Chain between needle-valve 1 picks up locking effect.
When fuel injector of the invention is installed, the bottom boss 12 of piston 7 is controlled to load by the groove 11 at the top of needle-valve 1 first
Pit 4, rotation adjustment control piston 7 makes the boss 12 of bottom and groove 11 not on a vertical shaft section, namely staggeredly cloth
Put.Then, cover plate 5 is loaded, in cover plate boss 14 is stretched into groove 11, while making the flat bit architecture 9 of control piston 7 and cover plate 5
The straight line portion of middle waist-shaped hole is engaged, so that control piston 7 and needle-valve 1 carry out locking, can prevent from controlling piston 7 and needle-valve
1 occurs relatively rotating, and prevents boss 12 from being scurried out from the top pit 4 of needle-valve 1.
When needle-valve 1 is closed, because being all high-voltage oil cavity 3, compression ignition high around the part such as needle-valve 1, control piston 7, cover plate 5
Oil can be entered by controlling the gap between the waist-shaped hole of the bottom of piston 7 and cover plate 5 and first central through hole 10 at the top of needle-valve 1
Pit 4.Due to control outer surface and first central through hole 10 of piston 7 inner surface and the second central through hole 16 inner surface it
Between gap be all higher than 0.1mm, therefore the hydraulic coupling that at this moment control piston 7 is subject to is balance, because the pretightning force of the spring of needle-valve 1
Pressure is more than connecting spring 6, so control piston base end face 13 will be pressed on the baseplane of pit 4.
In fuel injection beginning, control piston 7 moves up through bottom boss 12 and drives needle-valve 1 to move, it is ensured that control
Piston 7 is in fit-state, and then atomizer oil spout all the time with the upper surface of 1 pit of needle-valve 4.During end of injection, control piston 7 to
Lower motion simultaneously drives needle-valve 1 to move, and needle-valve 1 is taken a seat end of injection, realizes the normal work without static leakage fuel injector.
Meanwhile, during end of injection, control piston 7 and needle-valve 1 are moved downwardly together, and needle-valve 1 contacts needle-valve body 15 first
Sealing cone stop motion.Control piston 7 can effectively reduce the impulsive force to needle-valve 1 in the effect of above-mentioned damping clearance, enter
And reduce the impact to the sealing cone of needle-valve body 15, increase atomizer service life.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned implementation method
Detail, in range of the technology design of the invention, various equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
Claims (9)
1. a kind of common-rail injector, including oil injector body, the needle-valve and control piston that may be contained within oil injector body inner chamber, it is special
Levy and be：A high-voltage oil cavity for insertion is provided between the needle-valve, control piston and the inner surface of oil injector body；The control
Several boss are evenly arranged with the bottom cylindrical week of piston processed；The first center is provided with the top end face of the needle-valve to lead to
Hole, the periphery of first central through hole is evenly arranged with several grooves, be provided with the needle-valve of bottom portion of groove one with
First central through hole and institute it is fluted homogeneously lead to pit；The cover plate with the second central through hole is provided with the top of needle-valve, should
The bottom of cover plate is provided with the cover plate boss that several are stretched into groove, is provided with the top of cover plate and is connected with control piston
Connecting spring；Control piston is passed through from the first central through hole and the second central through hole respectively, and each described equal position of boss
In pit.
2. common-rail injector according to claim 1, it is characterised in that：The quantity of the boss, groove and cover plate boss
Equal, each groove is connected with the first central through hole；Each described boss can be stretched into pit from groove, and each is convex
Platform in pit with groove interlaced arrangement.
3. common-rail injector according to claim 1, it is characterised in that：The control piston base end face is put down with pit bottom
There is a damping clearance of 0.01 ~ 0.03mm between face.
4. common-rail injector according to claim 3, it is characterised in that：Depth of the height of each boss less than pit
Degree, each boss is more than 0.05mm with the distance between piston bottom end end face is controlled.
5. common-rail injector according to claim 1, it is characterised in that：The outer surface and the first center of the control piston
Gap between the inner surface of the inner surface of through hole and the second central through hole is all higher than 0.1mm.
6. common-rail injector according to claim 1, it is characterised in that：The top of each boss and the top of pit
Between be plane coordinate.
7. common-rail injector according to claim 1, it is characterised in that：The pit is circle, controls each of piston
The outer surface of boss is respectively positioned on same excircle, the diameter 0.1mm smaller than pit internal diameter of the excircle.
8. common-rail injector according to claim 1, it is characterised in that：The cover plate is mainly made up of two semicircular rings,
Cover plate external diameter 0.2mm bigger than needle-valve top outer diameter.
9. common-rail injector according to claim 1, it is characterised in that：Second central through hole is waist-shaped hole, control
The flat bit architecture that can be engaged with the straight line portion of waist-shaped hole is provided with the outer surface of piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009839.5A CN106870230B (en) | 2017-01-06 | 2017-01-06 | A kind of common-rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009839.5A CN106870230B (en) | 2017-01-06 | 2017-01-06 | A kind of common-rail injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106870230A true CN106870230A (en) | 2017-06-20 |
| CN106870230B CN106870230B (en) | 2019-09-24 |
Family
ID=59164505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710009839.5A Active CN106870230B (en) | 2017-01-06 | 2017-01-06 | A kind of common-rail injector |
Country Status (1)
| Country | Link |
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| CN (1) | CN106870230B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369633A (en) * | 2001-02-16 | 2002-09-18 | 郗大光 | Electronic fuel oil jetter |
| JP2008215190A (en) * | 2007-03-05 | 2008-09-18 | Denso Corp | Injector |
| CN104033299A (en) * | 2014-06-19 | 2014-09-10 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Common-rail oil sprayer |
| CN104265533A (en) * | 2014-07-31 | 2015-01-07 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Novel common rail oil injector |
| CN104481767A (en) * | 2014-12-05 | 2015-04-01 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Novel common-rail oil injector |
| CN104769269A (en) * | 2012-10-30 | 2015-07-08 | 罗伯特·博世有限公司 | Fuel injector comprising a piezoactuator |
| US9284930B2 (en) * | 2011-06-03 | 2016-03-15 | Michael R. Harwood | High pressure piezoelectric fuel injector |
-
2017
- 2017-01-06 CN CN201710009839.5A patent/CN106870230B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369633A (en) * | 2001-02-16 | 2002-09-18 | 郗大光 | Electronic fuel oil jetter |
| JP2008215190A (en) * | 2007-03-05 | 2008-09-18 | Denso Corp | Injector |
| US9284930B2 (en) * | 2011-06-03 | 2016-03-15 | Michael R. Harwood | High pressure piezoelectric fuel injector |
| CN104769269A (en) * | 2012-10-30 | 2015-07-08 | 罗伯特·博世有限公司 | Fuel injector comprising a piezoactuator |
| CN104033299A (en) * | 2014-06-19 | 2014-09-10 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Common-rail oil sprayer |
| CN104265533A (en) * | 2014-07-31 | 2015-01-07 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Novel common rail oil injector |
| CN104481767A (en) * | 2014-12-05 | 2015-04-01 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Novel common-rail oil injector |
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| Publication number | Publication date |
|---|---|
| CN106870230B (en) | 2019-09-24 |
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