CN201206522Y - Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system - Google Patents
Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system Download PDFInfo
- Publication number
- CN201206522Y CN201206522Y CNU2008200533684U CN200820053368U CN201206522Y CN 201206522 Y CN201206522 Y CN 201206522Y CN U2008200533684 U CNU2008200533684 U CN U2008200533684U CN 200820053368 U CN200820053368 U CN 200820053368U CN 201206522 Y CN201206522 Y CN 201206522Y
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- CN
- China
- Prior art keywords
- support ring
- injection system
- pressure
- oil
- sealing
- 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.)
- Expired - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims abstract description 15
- 239000007924 injection Substances 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 title abstract description 24
- 239000000446 fuel Substances 0.000 title abstract description 12
- 239000000295 fuel oil Substances 0.000 claims description 17
- 239000003921 oil Substances 0.000 description 36
- 239000007779 soft material Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a sealing device for a control plunger overskirt part for an injector of a common-rail fuel injection system. The sealing device comprises a soft-sealing ring (1), a supporting ring (2) with certain rigidity is arranged under the soft-sealing ring (1), a plurality of oil drain troughs (6) are arranged on the bottom surface of the supporting ring (2), a plurality of oil drain crescent slots (5) are arranged on the circumference of the supporting ring (2), and a plurality of retaining pawls (7) for buckling the soft-sealing ring (1) are arranged on the supporting ring (2). The oil drain troughs (6) and the oil drain crescent slots (5) are arranged in a staggered manner. The utility model is the sealing device for the control plunger overskirt part for the injector of the common-rail fuel injection system, and has the advantages of high sealing reliability and long service life.
Description
Technical field
The utility model relates to a kind of common-rail fuel oil injection system injector, particularly relates to a kind of common-rail fuel oil injection system injector control plunger bushing skirt section seal arrangement.
Background technique
At present, well-known Common rail fuel injection system is seen Fig. 1 as the product of Bosch.Fuel oil enters high-pressure common rail fuel pump by the low pressure oil transfer pump through low pressure fuel pipe from fuel tank, improves pressure after high-pressure oil pipe feeds the relatively large high-pressure common rail pipe of volume.Pressure in the high-pressure common rail pipe can be provided with on demand and be connected with the fuel inlet fitting of the common-rail injector of each cylinder by the high-pressure oil pipe passage identical with the cylinder of diesel engine number.The high pressure fuel that enters fuel inlet fitting divides two-way; The fuel gallery of leading up in the oil injector body communicates with pintle nozzle match-ing parts.Another road communicates with the pressure controling chamber that is surrounded by control plunger coupled parts, oil injector body, sealed steel ball and control plunger bushing skirt section seal arrangement.When the fuel injector magnetic system no electric circuit, be subjected to the effect of solenoid valve spring force, sealed steel ball is in sealing state, and the pressure that pressure controling chamber inner control plunger cross section is produced adds that the pressure of needle-valve return spring makes pintle nozzle match-ing parts be in closed condition, not oil spout of oil sprayer.When the needs oil spout, to the solenoid valve energising, the power that the magnetic force that solenoid valve produces adds oil pressure top sealed steel ball in the pressure controling chamber attracts to move on the armature greater than the solenoid valve spring force, and the pressure in the pressure controling chamber lifts sealed steel ball thereupon, rushes down oilhole and opens.Owing to rush down the oilhole aperture greater than the oil inlet hole aperture, the pressure in the pressure controling chamber is reduced, the pressure that the pressure that produces on the needle-valve cross section is produced greater than control plunger cross section adds the power of needle-valve return spring, moves on the control plunger, pintle nozzle match-ing parts is opened, and carries out oil spout.After the solenoid valve dead electricity, be subjected to the effect of solenoid valve spring force, sealed steel ball is taken a seat and is in sealing state, pressure in the pressure controling chamber raises, the pressure that plunger to be controlled cross section is produced adds that the power of needle-valve return spring is greater than the power that produces on the needle-valve cross section, pintle nozzle match-ing parts is in closed condition again, not oil spout of oil sprayer.
Because the pressure of pressure controling chamber is very high, surrounding needs the sealing at sealing position extremely important and crucial between each part of pressure controling chamber.If any surpassing a certain amount of improper leakage, pressure controling chamber can't reach the pressure state of setting, and oil sprayer can not be by the more satisfactory state work that is provided with, and serious causing can't be worked.
Do not caused control plunger coupled parts cisco unity malfunction or stuck during for the work of assurance control plunger coupled parts, control between plunger bushing skirt section and oil injector body and will leave certain clearance by distortion owing to control plunger under temperature rise, the high pressure.Be subjected to structural limitations, the structure of control plunger bushing skirt section seal arrangement and the reliability of sealing become one of focal issue of concern.From the state of the art, existing multiple structure is delivered with relevant patent, and it mainly contains: directly make a seal ring with soft material (as rubber, resin or other soft material except that copper material) on control plunger bushing skirt section and oil injector body step and seal.Its existing problems are: the high pressure of pressure controling chamber can be clamp-oned soft material in the gap of reserving between control plunger bushing skirt section and oil injector body, damages seal ring, and it is unreliable to seal, and the life-span is low.Other has on control plunger bushing skirt section and oil injector body step pad one that the steel support ring of certain rigidity is arranged, and the pressure that prevents pressure controling chamber is clamp-oned soft material and controlled in the gap of reserving between plunger bushing skirt section and oil injector body.Seal making a seal ring with soft material (as rubber, resin or other soft material except that copper material) on the support ring again.For a small amount of fuel oil of the permission that prevents to spill a little by Sealing from pressure controling chamber is trapped between Sealing and the support ring, make to move on the soft seal and stop up oil inlet hole or damage seal ring, on support ring, have and rush down oil groove.This structure is higher to support ring design and making and assembling quality requirement, because of the pressure of worrying pressure controling chamber soft material is clamp-oned and is rushed down oil groove, damages seal ring, and rushing down the oil groove passage can only be very small.The problem of its existence is: once owing to manufacture or material or work back greasy dirt or pressure surge are clamp-oned soft material and rushed down oil groove, make and rush down the oil groove inefficacy, then permit a small amount of fuel oil that spills to be trapped between Sealing and the support ring a little by Sealing from pressure controling chamber, may make to move on the soft seal and stop up oil inlet hole or damage seal ring, make seal failure.Also have soft seal circle and support ring are become one after assembling, support ring does not have the oil groove of rushing down.But still there is a small amount of fuel oil of the permission that may spill a little by Sealing from pressure controling chamber in it, because the fluctuation of pressure makes soft seal and support ring move the possibility of stopping up oil inlet hole or damaging seal ring on together.
The model utility content
Technical problem to be solved in the utility model provides a kind of sealing reliability common-rail fuel oil injection system injector high and long service life and controls plunger bushing skirt section seal arrangement.
In order to solve the problems of the technologies described above, the common-rail fuel oil injection system injector control plunger bushing skirt section seal arrangement that the utility model provides, comprise the soft seal circle, below described soft seal circle, be provided with a support ring with certain rigidity, in described support ring bottom surface a plurality of drain pans are set, the circumference of described support ring is provided with a plurality of draining crescents, and described support ring is provided with a plurality of lock pawls that described soft seal circle is fastened.
Described drain pan and described draining crescent are staggered.
Adopt the common-rail fuel oil injection system injector control plunger bushing skirt section seal arrangement of technique scheme, because pad one has the support ring of certain rigidity on control plunger bushing skirt section and oil injector body step, the support ring bottom surface is provided with a plurality of small drain pans, a plurality of small draining crescents are set on the circumference of support ring bottom surface, at the support ring top a plurality of lock pawls are set, the soft seal circle is placed on above the support ring, prevents the two separation with lock pawl.For improving sealing with respect to the control plunger bushing, support ring assembles in the mode that is pressed into the control plunger bushing.The pressure that has prevented pressure controling chamber is clamp-oned the soft seal circle in the gap of reserving between control plunger bushing skirt section and oil injector body, permit a small amount of fuel oil that spills to spill a little by the soft seal circle from pressure controling chamber, can not produce because the fluctuation of pressure makes soft seal or is difficult for producing and makes soft seal and support ring move the possibility of stopping up oil inlet hole or damaging seal ring on together from drain pan and draining crescent.The reliability and the life-span of seal arrangement have been improved.
In sum, the utility model is a kind of cost that do not increase substantially compared with the prior art, and sealing reliability common-rail fuel oil injection system injector higher and longer service life is controlled plunger bushing skirt section seal arrangement.
Description of drawings
Fig. 1 is the common-rail fuel oil injection system injector structural representation;
Fig. 2 is that the utility model is installed in the sectional drawing in the oil sprayer;
Fig. 3 is a support ring structure worm's eye view;
Fig. 4 is a support ring structure plan view;
Fig. 5 is along A-A line cut-away view among Fig. 4.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 2, Fig. 3, Fig. 4 and Fig. 5, there are 4 uniform small drain pans 6 support ring 2 bottom surfaces, and drain pan 6 is a circular arc type.4 small draining crescents 5 are arranged on support ring 2 circumference, and position and bottom surface drain pan 5 stagger into about 45 ° as far as possible.4 lock pawls 7 are arranged at support ring 2 tops.Earlier soft seal circle 1 is put into above the support ring 2 during assembling, with 90 ° of lock pawl 7 upsets, pushes down soft seal circle 1, be press fit into together then in control plunger bushing 3 sealing cylindricals and the oil injector body 4 with special tooling.
Referring to Fig. 2, Fig. 3, Fig. 4 and Fig. 5, adopt the common-rail fuel oil injection system injector control plunger bushing skirt section seal arrangement of technique scheme, because a support ring 2 that certain rigidity arranged is set below soft seal circle 1, be provided with a plurality of small drain pans 6 in support ring 2 bottom surfaces, a plurality of small draining crescents 5 are set on support ring 2 circumference, a plurality of lock pawls 7 are set at support ring 2 tops.Soft seal circle 1 is placed on above the support ring 2, prevents the two separation with lock pawl 7.For improving sealing with respect to the control plunger bushing, support ring assembles in the mode that is pressed into the control plunger bushing.
Pad one has the support ring 2 of certain rigidity on control plunger bushing 3 skirt sections and oil injector body 4 steps, prevents that the pressure of pressure controling chamber from clamp-oning soft seal circle 1 in the gap of control plunger bushing 3 skirt sections and 4 reservations of oil injector body.Permit a small amount of fuel oil that spills to spill from pressure controling chamber a little by soft seal circle 1, can not make to move on the soft seal circle 1 and stop up oil inlet hole or damage seal ring, the reliability and the life-span of having improved the sealing device from drain pan 6 and draining crescent 5.
Claims (2)
1, a kind of common-rail fuel oil injection system injector is controlled plunger bushing skirt section seal arrangement, comprise soft seal circle (1), it is characterized in that: below described soft seal circle (1), be provided with a support ring (2) with certain rigidity, in described support ring (2) bottom surface a plurality of drain pans (6) are set, the circumference of described support ring (2) is provided with a plurality of draining crescents (5), and described support ring (2) is provided with a plurality of lock pawls (7) that described soft seal circle (1) is fastened.
2, common-rail fuel oil injection system injector according to claim 1 is controlled plunger bushing skirt section seal arrangement, it is characterized in that: described drain pan (6) is staggered with described draining crescent (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200533684U CN201206522Y (en) | 2008-06-05 | 2008-06-05 | Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200533684U CN201206522Y (en) | 2008-06-05 | 2008-06-05 | Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201206522Y true CN201206522Y (en) | 2009-03-11 |
Family
ID=40465587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200533684U Expired - Fee Related CN201206522Y (en) | 2008-06-05 | 2008-06-05 | Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201206522Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899462A (en) * | 2012-12-31 | 2014-07-02 | 北京亚新科天纬油泵油嘴股份有限公司 | Sealing structure in ejector of fuel supply system |
| CN105508110A (en) * | 2016-01-22 | 2016-04-20 | 北京亚新科天纬油泵油嘴股份有限公司 | Common-rail injector and sealing device thereof |
-
2008
- 2008-06-05 CN CNU2008200533684U patent/CN201206522Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899462A (en) * | 2012-12-31 | 2014-07-02 | 北京亚新科天纬油泵油嘴股份有限公司 | Sealing structure in ejector of fuel supply system |
| CN105508110A (en) * | 2016-01-22 | 2016-04-20 | 北京亚新科天纬油泵油嘴股份有限公司 | Common-rail injector and sealing device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20130605 |