CN106870230B - A kind of common-rail injector - Google Patents
A kind of common-rail injector Download PDFInfo
- Publication number
- CN106870230B CN106870230B CN201710009839.5A CN201710009839A CN106870230B CN 106870230 B CN106870230 B CN 106870230B CN 201710009839 A CN201710009839 A CN 201710009839A CN 106870230 B CN106870230 B CN 106870230B
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- CN
- China
- Prior art keywords
- needle
- valve
- boss
- pit
- cover board
- 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
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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
Abstract
The invention discloses a kind of common-rail injectors, including oil injector body, needle-valve, control piston and high-voltage oil cavity；It controls and is evenly arranged with several boss on the bottom cylindrical week of piston；It is evenly arranged with several grooves in the top end surface of needle-valve, is provided with pit on the needle-valve of bottom portion of groove；It is provided at the top of needle-valve with cover board, the bottom of cover board is provided with several cover board boss, and the connecting spring being connected with control piston is provided at the top of cover board；Each boss is respectively positioned in pit.After adopting the above structure, in fuel injection beginning, it controls piston upwards and needle valve movement is driven by bottom boss, it ensure that control piston and needle-valve pit upper surface are in fit-state always, cover board can pick up locking effect to the chain between control piston and needle-valve, prevent control piston base boss from scurrying out from pit.When end of injection, piston moves downward and drives needle valve movement for control, and needle-valve is taken a seat end of injection, is able to achieve the normal work of no static leakage fuel injector.
Description
Technical field
The present invention relates to a kind of internal combustion engine fuel injection system component, especially a kind of common-rail injector.
Background technique
With the development of common rail fuel combustion system, injection pressure is higher and higher, and fuel oil static leakage problem is more and more prominent
Out, and further increasing for injection pressure is limited.In order to improve injection pressure, reduction quantity of fuel leakage reduces energy consumption,
Occur 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 by the working principle of common-rail injector it is found that armature is fast under the action of electromagnetic force after solenoid valves
Speed is opened, because the rate (passing through fuel-displaced metering-orifice draining) of control valve draining is far longer than the oil-filled rate that high pressure oil passes through fuel feed hole,
The pressure reduction of control chamber, needle-valve head on control piston stroking upward, commencement of fuel injection under the action of pressure difference.For No leakage fuel injector
Inner cavity be full of completely by high pressure fuel, i.e., control piston, needle-valve connection contact portion be all immersed in high pressure fuel completely.
After control chamber pressure reduction, piston is controlled under the action of hydraulic coupling and is moved upwards first.However because control
Be full of between piston and needle-valve by high pressure fuel, thus needle-valve under the action of pressure difference can not model- following control piston one start shipment
It is dynamic, that is, it cannot achieve quick oil spout, fuel injector is easy to appear the phenomenon that can not work normally.
Summary of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of control piston and needles
Valve fit-state is good, is able to achieve the common-rail injector that no static leakage common-rail injector works normally.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of common-rail injector, including oil injector body, the needle-valve being all set in oil injector body inner cavity and control piston, institute
State the high-voltage oil cavity that a perforation is provided between needle-valve, control piston and the inner surface of oil injector body；The control piston
Bottom cylindrical is evenly arranged with several boss on week；The first central through hole is provided in the top end surface of the needle-valve, this
The periphery of one central through hole is evenly arranged with several grooves, and one and the first center are provided on the needle-valve of bottom portion of groove
Through-hole and institute it is fluted homogeneously lead to pit；The cover board with the second central through hole, the bottom of the cover board are provided at the top of needle-valve
Portion is provided with several cover board boss protruded into groove, and the connection bullet being connected with control piston is provided at the top of cover board
Spring；Control piston is passed through from the first central through hole and the second central through hole respectively, and each boss is respectively positioned in pit.
The quantity of the boss, groove and cover board boss is equal, and each groove is connected with the first central through hole；Often
A boss can protrude into pit from groove, each boss in pit with groove interlaced arrangement.
Damping clearance with a 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
Greater 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 larger than 0.1mm.
Cooperate between the top of each boss and the top of pit for plane.
The pit is circle, and the outer surface for controlling each boss of piston is respectively positioned on the same excircle, the outer circle
The diameter in week is 0.1mm smaller than pit internal diameter.
The cover board is mainly made of two semicircular rings, and cover board outer diameter is 0.2mm bigger than needle-valve top outer diameter.
Second central through hole is waist-shaped hole, controls that be provided on the outer surface of piston can be with the straight line portion of waist-shaped hole
The flat bit architecture matched.
The present invention with the above structure, the boss of above-mentioned control piston base can be matched with the pit at the top of needle-valve,
Good fit-state is realized to make to control piston and needle-valve；Above-mentioned cover board can pick up the chain between control piston and needle-valve
Locking effect prevents control piston and needle-valve from relatively rotating, and boss is scurried out from pit at the top of needle-valve；And needle-valve, control are lived
It is all high-voltage oil cavity around the parts such as plug, cover board, 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, ensure that control piston
It is in fit-state, and then atomizer oil spout always with needle-valve pit upper surface.When end of injection, piston moves downward for control simultaneously
Needle valve movement is driven, needle-valve is taken a seat end of injection, and the normal work of no static leakage fuel injector is realized.
Meanwhile when end of injection, controls piston and needle-valve moves downwardly together, needle-valve contact pin sealing conical surface of valve body first
Stop motion.Control piston can effectively reduce the impact force to needle-valve in the effect of above-mentioned damping clearance, and then reduce to needle
The impact of sealing conical surface of valve body increases atomizer service life.
Detailed description of the invention
Fig. 1 shows a kind of the schematic diagram of the section structure of common-rail injector of the present invention；
Fig. 2 shows a kind of exploded perspective schematic diagram of common-rail injector of the present invention；
Fig. 3 shows the partial structural diagram that piston is controlled in the present invention.
Wherein have: 1- needle-valve；2- oil injector body；3- high-voltage oil cavity；4- pit；5- cover board；6- connecting spring；7- control is lived
Plug；8- gasket；The flat bit architecture of 9-；The first central through hole of 10-；11- groove；12- boss；13- controls piston base end face；14-
Cover board boss；15- needle-valve body；The second central through hole of 16-；The first semicircular ring of 17-；The second semicircular ring of 18-.
Specific embodiment
Xia Mianjiehefutuhejuti compare Jia Shishifangshiduibenfamingzuojinyibuxiangxishuoming.
As shown in Figure 1, a kind of common-rail injector, including oil injector body 2, the needle-valve being all set in 2 inner cavity of oil injector body
1 and control piston 7；The high-voltage oil cavity 3 that a perforation is formed between needle-valve 1, control piston 7 and the inner surface of oil injector body 2, should
High pressure fuel is filled in high-voltage oil cavity 3.
As shown in Figure 1 and Figure 2, it controls and is evenly arranged with several boss 12 on the bottom cylindrical week of piston 7.Each boss
The distance between 12 and control 7 bottom end end face of piston are all larger than 0.05mm.Each boss 12 is both preferably cube or cuboid
Structure, the top end surface of each boss 12 are a plane.
As depicted in figs. 1 and 2, the first central through hole 10 is provided in the top end surface 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 on the needle-valve 1 of 11 bottom of groove one with first central through hole 10 and fluted 11 communicate
Pit 4.The height of each above-mentioned boss 12 is less than the depth of pit 4.
As depicted in figs. 1 and 2, the top of needle-valve 1 is provided with the cover board 5 with the second central through hole 16, the bottom of the cover board 5
Portion is provided with several cover board boss 14 protruded into groove 11, and the height of each cover board boss 14, which is respectively less than, is equal to groove 11
Height.The setting of cover board boss 14 can be effectively prevented cover board 5 and rotate and slide relatively.
Above-mentioned cover board 5, as shown in Fig. 2, be mainly made 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.5 outer diameter of cover board is pushed up than needle-valve 1
The big 0.2mm of portion's outer diameter, to facilitate the disassembly of cover board 5.
The top of above-mentioned cover board 5 is provided with connecting spring 6, and one end of connecting spring 6 acts on needle-valve 1 by cover board 5, even
The other end for connecing spring 6 is acted on control piston 7 by gasket 8, and the connecting spring 6 is so that it is guaranteed that cover board 5 is pressed on needle-valve 1
On, make top planes contact of 12 top planes of boss with pit 4 on needle-valve 1 for controlling 7 bottom of piston, and then ensure that needle
Connection between valve 1 and control piston 7.
Above-mentioned boss 12, groove 11 are equal with the quantity of cover board boss 14, it is preferably to be 4, and circumferentially have phase
The same regularity of distribution.Each boss 12 can protrude into pit 4 from groove 11, and each boss 12 interlocks in pit 4 with groove 11
Arrangement.As an alternative, the quantity of boss 12, groove 11 and cover board boss 14 can not also wait, if the quantity of groove 11 is greater than convex
The quantity etc. of platform 12, at this moment, it is only necessary to which the groove 11 matched 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
Gap between the inner surface of the first central through hole 10 and the inner surface of the second central through hole 16 is all larger than 0.1mm, high compression ignition
Oil can pass through from the gap.
Further, between the damping between control piston base end face 13 and 4 baseplane of pit with a 0.01 ~ 0.03mm
Gap.
Further, above-mentioned pit 4 is circle, and the outer surface for controlling each boss 12 of piston 7 is respectively positioned on the same outer circle
The diameter of Zhou Shang, the excircle are 0.1mm smaller than 4 internal diameter of pit, so as to ensure to control between piston 7 and needle-valve 1 in radial direction
It can move and be adjusted, prevent stuck.
Further, above-mentioned second central through hole 16 is waist-shaped hole, controls and is provided with energy and waist-shaped hole on the outer surface of piston 7
The flat bit architecture 9 that matches of straight line portion.The setting of flat bit architecture 9 can make 5 pairs of control 7 Hes of piston of cover board at 1 top of needle-valve
Chain between needle-valve 1 picks up locking effect.
When fuel injector of the invention is installed, control 7 bottom boss 12 of piston is packed by the groove 11 at 1 top of needle-valve first
Pit 4, the boss 12 and groove 11 that rotation adjustment control piston 7 makes bottom be not on a vertical shaft section, namely staggeredly cloth
It sets.Then, it is packed into cover board 5, protrudes into cover board boss 14 in groove 11, while making the flat bit architecture 9 and cover board 5 that control piston 7
The straight line portion of middle waist-shaped hole matches, to make to control piston 7 and the progress locking of needle-valve 1, can prevent control piston 7 and needle-valve
1 relatively rotates, and prevents boss 12 from scurrying out from 1 top pit 4 of needle-valve.
When needle-valve 1 is closed, because being all high-voltage oil cavity 3, high compression ignition around the parts such as needle-valve 1, control piston 7, cover board 5
Oil can be entered by the gap between first central through hole 10 at 1 top of waist-shaped hole and needle-valve of control 7 bottom of piston and cover board 5
Pit 4.Due to control piston 7 outer surface and the first central through hole 10 inner surface and the second central through hole 16 inner surface it
Between gap be all larger than 0.1mm, therefore at this moment the hydraulic coupling that is subject to of control piston 7 is balance, because of the pretightning force of 1 spring of needle-valve
Pressure is greater than connecting spring 6, so control piston base end face 13 will be pressed on 4 baseplane of pit.
In fuel injection beginning, control piston 7 moves up through bottom boss 12 and needle-valve 1 is driven to move, and ensure that control
Piston 7 and 1 pit of needle-valve, 4 upper surface are in fit-state, and then atomizer oil spout always.When end of injection, control piston 7 to
Lower movement simultaneously drives needle-valve 1 to move, and needle-valve 1 is taken a seat end of injection, realizes the normal work of no static leakage fuel injector.
Meanwhile when end of injection, controls piston 7 and needle-valve 1 moves downwardly together, needle-valve 1 contacts needle-valve body 15 first
Sealing cone stop motion.The impact force to needle-valve 1 can be effectively reduced in the effect of above-mentioned damping clearance by controlling piston 7, into
And reduce the impact to 15 sealing cone of needle-valve body, increase atomizer service life.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail a variety of equivalents can be carried out to technical solution of the present invention within the scope of the technical concept of the present invention, this
A little equivalents all belong to the scope of protection of the present invention.
Claims (9)
1. a kind of common-rail injector, special including oil injector body, the needle-valve being all set in oil injector body inner cavity and control piston
Sign is: the high-voltage oil cavity of a perforation is provided between the needle-valve, control piston and the inner surface of oil injector body；The control
Several boss are evenly arranged on the bottom cylindrical week of piston processed；It is logical that the first center is provided in the top end surface of the needle-valve
Hole, the periphery of first central through hole are evenly arranged with several grooves, be provided on 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 board with the second central through hole is provided at the top of needle-valve, it should
The bottom of cover board is provided with several cover board boss protruded into groove, is provided at the top of cover board 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 equal position of the boss
In pit.
2. common-rail injector according to claim 1, it is characterised in that: the quantity of the boss, groove and cover board boss
It is equal, each groove is connected with the first central through hole；Each boss can protrude into pit from groove, each 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 and pit bottom are flat
With the damping clearance of a 0.01 ~ 0.03mm between face.
4. common-rail injector according to claim 3, it is characterised in that: the height of each boss is less than the depth of pit
Degree, the distance between each boss and control piston bottom end end face are greater than 0.05mm.
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 through-hole and the inner surface of the second central through hole is all larger 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 for plane cooperate.
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 the same excircle, and the diameter of the excircle is 0.1mm smaller than pit internal diameter.
8. common-rail injector according to claim 1, it is characterised in that: the cover board is made of two semicircular rings, cover board
Outer diameter is 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 matched with the straight line portion of waist-shaped hole is provided on 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 CN106870230A (en) | 2017-06-20 |
| CN106870230B true CN106870230B (en) | 2019-09-24 |
Family
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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 |
|---|---|
| CN106870230A (en) | 2017-06-20 |
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