CN105257445B - A kind of injector - Google Patents
A kind of injector Download PDFInfo
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- CN105257445B CN105257445B CN201510658165.2A CN201510658165A CN105257445B CN 105257445 B CN105257445 B CN 105257445B CN 201510658165 A CN201510658165 A CN 201510658165A CN 105257445 B CN105257445 B CN 105257445B
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- injector
- armature
- fixed core
- stopper
- internal stop
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Abstract
The invention discloses a kind of injector, including moving parts and fixed core, moving parts include Needle shaft, armature and upper stopper.The inner ring surface bottom of fixed core is equipped with the L-shaped annular groove in section, and the internal stop being matched therewith is equipped in annular groove.Upper link stopper is sleeved on the Needle shaft periphery at the top of armature；Upper link stopper includes the spring base and pedestal being wholely set, and when moving parts axially upwardly move, the upper limit plane of pedestal can be in contact with the lower limit plane of internal stop, and there are one preset clearances for tool between pedestal lower face and fixed core lower face.With the above structure, when injector works, upper stopper is collided with internal stop, it is avoided that the direct collision of armature and fixed core, mitigate the abrasion of armature and fixed core, ensures impulse stroke and good flow rates characteristic that injector is stablized, improve the working life of injector.In addition, armature can be moved prior to Needle shaft, the speed that needle-valve is opened is improved, improves the unlatching response of injector.
Description
Technical field
The present invention relates to a kind of fuel injection device of car combustion engine, especially a kind of injector.
Background technology
There are one electromagnetic valve component and movable moving parts, electromagnetic valve component tools for existing injector, usually tool
There are one electromagnetic coil, movable moving parts are made of armature and needle-valve.When solenoid ON exciting current, armature
Being driven needle-valve by electromagnetic force, pole orientation moves inwardly, until the stop surface of armature collides the stop surface of fixed core.
Since armature and fixed core are made of soft magnetic materials, with the smaller defect of mechanical strength.Influenced by collision, armature with it is fixed
Iron core stop surface is easily damaged, and the impulse stroke to change needle-valve causes the discharge characteristic of injector unstable or even influences whole
The life span of a injector.Therefore, armature stop face and fixed core stop surface how to be avoided to send out in the injector course of work
Raw direct collision ensures that the reliable movement of needle-valve and the regime flow of injector are the key technologies of current in-cylinder direct-jet injector
One of.
The patent application of Publication No. CN 1714235A, discloses a kind of fuel injection valve, and armature is characterized in the rank
Iron stop surface and/or the stop surface are set there are one coating, wherein：The coating, which has, carries some elevated regions and some recessed areas
The surface texture in domain, the coating are formed by coating process, these elevated regions are configured to segment shape.By being applied on armature
Coating the configuration for showing structure, armature stop face can be effectively protected, to make the flow control of fuel injection valve more
Accurately.
The fuel injection valve disclosed in CN 1714235A has following technical problem：
1. the movement travel of fuel injection valve is generally within 100 microns, and fixed core and rank made of magnetic material
The thickness of ferromagnetic face coat is generally in 10 microns, the movement travel of the thickness effect fuel injection valve of coating, no
It can guarantee the consistency of the coating layer thickness of each injector.
2. coating process can form certain elevated regions or recessed area, wherein stress of the elevated regions as impact
Point reduces the forced area of impact force, easy to wear during frequent impact.
3. coating requires height, the matrix that coating is protected with it easily to occur under long-term impact force action processing technology
The spalling failure of coating, it cannot be guaranteed that the impulse stroke of injector, to directly affect the discharge characteristic of injector.
Invention content
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 injector, the sprays
Emitter is avoided that the direct collision abrasion of fixed core and armature made of magnetic material, ensures reliable movement and the injection of needle-valve
The regime flow of device.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of injector, including can be along moving parts, fixed core component and the coil group of injector longitudinal axis axial movement
Part, the moving parts include Needle shaft, be set in Needle shaft in the middle part of periphery armature and be set to the bulb of Needle shaft bottom,
The fixed core component includes the fixed core for being set in Needle shaft top peripheral, and the bottom of the fixed core is provided with internal stop；
The moving parts further include upper stopper, and link stopper is sleeved on the Needle shaft periphery at the top of armature on this；Work as moving parts
When axially upwardly moving, the upper limit plane of upper link stopper can be in contact with the lower limit plane of internal stop, and upper link stopper lower face with it is fixed
There are one preset clearances for tool between iron core lower face.
There are one the L-shaped annular groove in section, the internal stop energy and rings for the inner ring surface bottom setting of the fixed core
Connected in star matches.
The height of the internal stop is less than the depth of annular groove, and the outer diameter of upper stopper is less than the most imperial palace of annular groove
Diameter.
Spring base is set on Needle shaft periphery at the top of the armature, the upper link stopper is to be sleeved on outside spring base bottom
Week and the pedestal being wholely set with spring base, the upper link stopper lower face are also pedestal lower face.
The moving parts further include lower stopper, which is fixedly set in positioned at the Needle shaft periphery of armature bottom
On；Armature can carry out axial sliding between upper link stopper and lower stopper；When injector remains static, armature lower face with
The upper surface of lower stopper is in contact, and there are one maximum axial sliding distances for tool between armature upper surface and pedestal lower face.
The maximum axial sliding distance is 0.02-0.06mm.
The preset clearance is by the thickness of pedestal and the distance between the lower limit plane of internal stop and fixed core lower face
It is determined.
The preset clearance is 0.03-0.05mm.
When injector remains static, the distance between the lower limit plane of the internal stop and the upper limit plane of pedestal
For the impulse stroke of moving parts, which determines the uninterrupted of injector.
The material of the internal stop and upper link stopper is martensite stainless steel material.
The upper link stopper and lower stopper are rigidly connected with Needle shaft by welding.
The internal stop is pasted onto in annular groove.
The present invention with the above structure, during the work time, collided injector with internal stop, is avoided that by upper stopper
The direct collision of armature and fixed core mitigates the abrasion of armature and fixed core, ensures impulse stroke that injector is stablized and good
Discharge characteristic, while improving the working life of injector.In addition, after coil block is powered, armature is moved prior to Needle shaft, phase
Initially there is certain acceleration to Needle shaft movement, the speed of needle-valve opening can be improved, improve the unlatching response of injector.
Description of the drawings
Fig. 1 shows the structural schematic diagram of injector of the present invention.
Fig. 2 shows encircled in Fig. 1（That is Ith area）Enlarged drawing.
Fig. 3 shows the structural schematic diagram of moving parts in injector of the present invention.
Fig. 4 shows the vertical view of moving parts in injector of the present invention.
Fig. 5 shows structural schematic diagram when injector of the present invention remains static.
Fig. 6 shows structural schematic diagram when injector of the present invention is in full open position.
Wherein have：1, injector；2, coil block；3, shell；4, fixed core component；5, injector longitudinal axis；6, it moves
Component；7, fixed core；71, inner ring surface；72, annular groove；73, fixed core lower face；8, internal stop；81, lower limit plane；9, needle
Valve rod；10, upper stopper；101, spring base；102, pedestal；103, upper limit plane；104, pedestal lower face；11, armature；111, it holds in the mouth
Iron lower face；112, armature upper surface；12, lower stopper；13, bulb；14, porous oil nozzle；15, spring；16, valve seat.
In Fig. 2, h1 is the distance between lower limit plane and fixed core lower face of internal stop；
In Fig. 3, h2 is maximum axial sliding distance of the armature with respect to Needle shaft；H3 is the thickness of pedestal；
In Fig. 5, h4 is the impulse stroke of moving parts；When h5 remains static for injector, armature upper surface with it is fixed
The distance between iron core lower face；
δ indicates the preset clearance between pedestal lower face and fixed core lower face in Fig. 6.
Specific implementation mode
The present invention is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of injector of electromagnetic type, including injector 1, the downstream end of the injector 1 are mounted on hair
Engine cylinder covers, and fuel is injected directly by the jet rose 14 of the downstream end of injector 1 in the combustion chamber of cylinder（Do not show
Go out）.
As shown in Figure 1, injector 1, including a fixed core component 4 of shell 3, one of coil block 2, one and one
The moving parts 6 that can be axially moved along injector longitudinal axis 5.Injector 1 realizes injection by the axial movement of moving parts 6
The injection process of device.
Fixed core component 4 includes fixed core 7 and internal stop 8.Wherein, 71 bottom of inner ring surface of fixed core 7 is preferably machined with
The L-shaped annular groove 72 in section as shown in Figure 2.There are one match with 72 shape of annular groove for setting in annular groove 72
Internal stop 8.As an alternative, the bottom of fixed core 7 is alternatively plane, internal stop 8 is adhered directly to the bottom of fixed core 7.
Since the material of fixed core 7 is soft magnetic materials, mechanical strength is small.The setting of annular groove 72 can increase and determine iron
Forced area when core is collided, the stress deformation for preventing fixed core 7 from being generated by collision.In addition, the setting of annular groove 72,
The fitting that can make internal stop 8 more closely, consolidates.
Internal stop 8 is assemblied in by way of adhering to or being interference fitted in the annular groove 72 of fixed core 7, makes internal stop
8 height is less than the depth of annular groove 72, after the completion of assembling in this way, lower limit plane 81 and the fixed core lower face of internal stop 8
There are one distance h1 for tool between 73.
As an alternative, the height of internal stop 8 is also greater than or the bottom of the depth equal to annular groove 72 namely internal stop 8
Portion is stretched out from annular groove 72.At this moment, the outer diameter of following pedestals 102 can not have to the most imperial palace less than annular groove 72 yet
Diameter.This transformation, still within protection scope of the present invention.
As shown in figure 3, moving parts 6 include Needle shaft 9, upper stopper 10, armature 11, lower stopper 12 and are set to Needle shaft
The bulb 13 of bottom is set with spring base 101, top and the spring 15 of spring base 101 on 9 periphery of Needle shaft at the top of armature 11
It is connected.Upper stopper 10, lower stopper 12 and bulb 13 are preferably rigidly connected by welding with Needle shaft 9, and armature 11 is located at upper gear
Between block 10 and lower stopper 12, the opposite Needle shaft 9 of armature 11 is with small axial movement, maximum axial sliding distance
The numerical values recited of h2, h2 are in the range of 0.02mm to 0.06mm.
As shown in figure 4, upper stopper 10 is sleeved on 9 periphery of Needle shaft at 11 top of armature, it is preferably sleeved on bullet
The pedestal 102 being wholely set on 101 bottom cylindrical week of spring abutment and with spring base 101, in this way, upper link stopper lower face is also pedestal
Lower face 104.The outer diameter of pedestal 102 is less than the maximum inner diameter of annular groove 72；When moving parts 6 axially upwardly move, bottom
The upper limit plane of seat 102 can be in contact with the lower limit plane 81 of internal stop 8, and pedestal lower face 104（Or armature upper surface 112）
There are one preset clearance δ for tool between fixed core lower face 73.Preset clearance δ is by under the thickness and internal stop 8 of pedestal 102
The distance between confined planes 81 and fixed core lower face 73 are determined.
Assuming that the thickness value of pedestal 102 is h3, then the numerical value of h3 is more than the numerical value of h1, and preset clearance δ will be for h3's and h1
Difference.To ensure that the magnetic field intensity of entire electromagnetic circuit, preset clearance δ are preferably in the range of 0.03mm to 0.05mm.
Lower link stopper 12 is fixedly set on 9 periphery of Needle shaft of 11 bottom of armature.Internal stop 8, upper link stopper 10 and under
The material of block 12 is martensite stainless steel material.
The operation principle of the injector of the present invention is as follows：
1. injector remains static namely bulb 13 and valve seat 16 keep the state fitted closely
As shown in figure 5, when injector remains static, armature lower face 111 is landed in lower stopper 12, armature upper end
By tool, there are one above-mentioned maximum axial sliding distance h2 between face 112 and upper stopper lower face 104.Upper stopper 10 is in spring 15
Under the action of so that kept between the upper limit plane 103 of its pedestal 102 and the lower limit plane 81 of internal stop 8 it is certain it is axial away from
From the distance is the impulse stroke h4 of moving parts 6, which determines that the distributive value flowed out from jet rose 14 is big
It is small.When injector remains static, there will be certain distance h5 between armature upper surface 112 and fixed core lower face 73,
The numerical values recited of distance h5 is equal to the sum of the numerical value of h2, h4 and δ three.
When above-mentioned injector 1 remains static, bulb 13 and valve seat 16 keep the state fitted closely, on needle-valve head
A sealing surface is formed, the body formed between 16 inner ring surface of 13 surface of bulb and valve seat is constituted with 3 inner cavity of shell to be sprayed
The fuel gallery of emitter is full of fuel oil in entire fuel gallery.
2. injector is in running order
When coil block 2 is applied in certain electric signal, fixed core 7 and armature 11 around coil block 2 are instantaneously built
A magnetic field is stood, the electromagnetic force which generates so that pole orientation moves upwards armature 11 inwardly.When armature 11 moves to rank
When pedestal lower face 104 is collided in iron upper surface 112, the armature 11 with certain acceleration drives entire moving parts 6 to overcome bullet
Spring force moves upwardly together, until the collision of upper limit plane 103 of pedestal is to the lower limit plane 81 of internal stop 8, at this time armature upper end
By tool, there are one above-mentioned preset clearance δ between fixed core lower face 73 in face 112, as shown in Figure 6.
Needle shaft 9 lifts completely at this time, and far from valve seat 16, injector is in a fully open position bulb 13, through whole
The fuel of a fuel channel passes through from the medial surface of injection pedestal, is directed at least one nozzle bore, is then sprayed into and starts
The combustion chamber of machine（It is not shown in figure）.
3. injector restores stationary state again
When cutting off the electric signal of coil block 2, after magnetic field is decayed enough, electromagnetic force disappears, and armature 11 is fallen downwards,
The moving parts 6 coupled with armature 11 also move downward therewith under the action of spring force and its own gravity, the ball on needle-valve head
First 13 are finally landed on valve seat 16, form a sealing surface on needle-valve head, keep injector in the closed position, injector is extensive
Again to stationary state, so as to complete a course of injection.Above-mentioned course of injection will subsequently be repeated.
In the whole work process of injector, armature 11 and fixed core 7 do not generate always made of soft magnetic materials
Direct collision, only harder upper stopper 10 are collided with internal stop 8, so alleviate the abrasion of armature 11 and fixed core 7,
Ensure the impulse stroke that injector is stablized, and the impulse stroke of injector directly determines the distributive value of injector, and then ensure
Injector good discharge characteristic, while also improving the working life of injector.In addition, after coil block 2 is powered, armature
11 move prior to Needle shaft 9, and the armature 11 with certain acceleration acts on Needle shaft 9, improves moving parts and initially transports
Dynamic speed, to improve the unlatching response of injector.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the variation that can be readily occurred in
Or replace, it should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the guarantor of claim
It protects subject to range.
Claims (7)
1. a kind of injector, including moving parts, fixed core component and the coil block that can be moved axially along injector longitudinal axis,
The moving parts include Needle shaft, be set in Needle shaft in the middle part of periphery armature and be set to the bulb of Needle shaft bottom, institute
It includes the fixed core for being set in Needle shaft top peripheral to state fixed core component, it is characterised in that：The bottom of the fixed core is arranged
There is internal stop；The moving parts further include upper stopper, which is sleeved on the Needle shaft periphery at the top of armature；When
When moving parts axially upwardly move, the upper limit plane of upper stopper can be in contact with the lower limit plane of internal stop, and under upper stopper
There are one preset clearances for tool between end face and fixed core lower face；It is set with spring on Needle shaft periphery at the top of the armature
Seat, the upper stopper is the pedestal for being sleeved on spring base bottom periphery and being wholely set with spring base, the upper stopper lower face
Also it is pedestal lower face；The moving parts further include lower stopper, which is fixedly set in the needle positioned at armature bottom
On stem outer circumference；Armature can carry out axial sliding between upper stopper and lower stopper；When injector remains static, armature
Lower face is in contact with the upper surface of lower stopper, between armature upper surface and pedestal lower face tool there are one maximum axial sliding away from
From；When injector remains static, the distance between the lower limit plane of the internal stop and the upper limit plane of pedestal are fortune
The impulse stroke of dynamic component, the impulse stroke determine the uninterrupted of injector.
2. injector according to claim 1, it is characterised in that：There are one cut for the inner ring surface bottom setting of the fixed core
The L-shaped annular groove in face, the internal stop can be matched with annular groove.
3. injector according to claim 2, it is characterised in that：The height of the internal stop is less than the depth of annular groove
Degree, the outer diameter of upper stopper are less than the maximum inner diameter of annular groove.
4. injector according to claim 1, it is characterised in that：The maximum axial sliding distance is 0.02-0.06mm.
5. injector according to claim 1, it is characterised in that：The preset clearance by pedestal thickness and internal stop
The distance between lower limit plane and fixed core lower face determined.
6. injector according to claim 5, it is characterised in that：The preset clearance is 0.03-0.05mm.
7. injector according to claim 1, it is characterised in that：The internal stop and the material of upper stopper are martensite
Stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510658165.2A CN105257445B (en) | 2015-10-14 | 2015-10-14 | A kind of injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510658165.2A CN105257445B (en) | 2015-10-14 | 2015-10-14 | A kind of injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105257445A CN105257445A (en) | 2016-01-20 |
| CN105257445B true CN105257445B (en) | 2018-08-24 |
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ID=55097321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510658165.2A Active CN105257445B (en) | 2015-10-14 | 2015-10-14 | A kind of injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105257445B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203476571U (en) * | 2013-09-22 | 2014-03-12 | 辽宁新风企业集团大连亿特科技有限公司 | Buffering structure of high-speed solenoid valve of oil atomizer |
| CN104454274B (en) * | 2014-12-03 | 2017-09-29 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | A kind of fuel injector |
| CN104632486B (en) * | 2014-12-03 | 2017-04-05 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | For the control valve of fuel injector |
| CN104847555B (en) * | 2015-04-09 | 2018-02-09 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | A kind of fuel injector for improving electromagnetic actuator efficiency |
| CN104763568B (en) * | 2015-04-09 | 2017-06-30 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | A kind of electromagnetic jet valve and the method for operating electromagnetic jet valve |
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2015
- 2015-10-14 CN CN201510658165.2A patent/CN105257445B/en active Active
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| Publication number | Publication date |
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| CN105257445A (en) | 2016-01-20 |
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