CN100489300C - Double-spring fuel injector - Google Patents
Double-spring fuel injector Download PDFInfo
- Publication number
- CN100489300C CN100489300C CNB200710085331XA CN200710085331A CN100489300C CN 100489300 C CN100489300 C CN 100489300C CN B200710085331X A CNB200710085331X A CN B200710085331XA CN 200710085331 A CN200710085331 A CN 200710085331A CN 100489300 C CN100489300 C CN 100489300C
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- Prior art keywords
- spring
- level
- level spring
- oil nozzle
- supporting rod
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Abstract
The inventio0n relates to a novel double-spring fuel sprayer, and is suitable for diesel engines; the invention can reduce noise and vibration of the diesel engine, and improve the combustion process. The fuel sprayer can bear higher load, the length is relatively short, and the pre-tightening force of the secondary spring can be adjusted and measured independently and accurately.
Description
Technical field the present invention relates to a kind of being used for fuel oil is sprayed into burning chamber of diesel engine, and size is less, and is easy to assembly, can bear the double-spring fuel injector of higher load.
Background technique is well-known, and two-spring injector can be used for reducing the combustion noise of diesel engine, improves combustion process.But two-spring injector scheme of the prior art still has following shortcoming.1, assembly process need be used the adjustment of pad repeated disassembled and assembled, bothers very much, and both having wasted time and energy has increased cost, also is difficult for accurately measuring independently and regulating the pretightening force of second level spring with assurance fuel-injected conformity and reliability.2, two-spring injector scheme of the prior art all has and is set to up and down two springs vertically arranging, makes that the longitudinal size of whole oil sprayer is longer, influences the boundary dimension of diesel engine.3, two-spring injector scheme of the prior art is after the oil nozzle spool is covered whole lifts, movement parts such as following of one-level spring lower seat and two-level spring also can continue to move upward pressure spring under action of inertia, increase the load of spring, therefore and the potential energy of accumulation can be converted into kinetic energy when the oil nozzle spool is descending and spring, and cause added impact load when oil nozzle is closed.In brief, in existing two-spring injector scheme, the additional load that the inertia of movement parts causes on spring and oil nozzle can not be effectively suppressed, and this will have a negative impact to the life-span and the reliability of oil sprayer.For example, the application number that EUROPEAN PATENT OFFICE announces is a two-spring injector scheme related in the document of DE19883825832 19880729, is exactly typical case's representative of the prior art.
Summary of the invention the object of the present invention is to provide a kind of double-spring fuel injector, and it also has following characteristics except that the characteristics with general two-spring injector.1, this double-spring fuel injector is in assembly process, the main pretightening force of threaded adjusting two-stage spring and the first order lift of oil nozzle spool used, can accurately measure and regulate the pretightening force of second level spring independently, convenient for assembly and the debugging, guarantee the conformity and the reliability of oil sprayer performance, and save cost; 2, the longitudinal length of this double-spring fuel injector is less than the existing two-spring injector that adopts the two-stage spring to be arranged above and below; 3, the additional load that causes on oil nozzle and spring of this double-spring fuel injector movement parts inertia has obtained effective inhibition, thereby bearing capacity and reliability are improved.
The double-spring fuel injector that the present invention relates to removes and includes tight cap, oil nozzle, the one-level spring lower seat, nozzle holder, the one-level spring, one-level pressure regulation plug screw, block, pad, outside the part that conventional mechanical formula oil sprayers such as big locking nut are had, it also comprises a supporting rod that is installed on the one-level pressure regulation plug screw, on this supporting rod two-level spring is installed, following of the two-level spring seat of honour and two-level spring, supporting rod inserts in the center hole of one-level spring as parts with the two-level spring that has regulated pretightening force on it, makes the two-stage spring in that size is overlapping longitudinally.In the opening process of oil nozzle, reach the h of prior setting when the stroke of oil nozzle spool
1After, at first meet with the lower end of following of two-level spring in the upper end of one-level spring lower seat, two-level spring begins to work, and the oil nozzle spool is imposed the power opposite with its moving direction, the speed that the oil nozzle spool that slows down upwardly opens, this moment, oil nozzle still was in the part oil mass pre-spray stage.When the stroke of oil nozzle spool reaches h
2After, the oil nozzle spool is hampered by nozzle holder, the part oil mass pre-spray stage finishes, oil nozzle is in full oil mass main injection state, and the one-level spring lower seat the effect of inertial force is next upwards continue motion Δ h again after, be hampered by the barrier force that supporting rod transmits, thereby finish the overall process that oil sprayer is opened.The pretightening force of two-level spring can be regulated exactly to be threaded in supporting rod and the two-level spring seat of honour; Supporting rod and one-level pressure regulation plug screw also to be threaded, are accurately being adjusted h
1After, be locked together securely by little locking nut.
By the technological scheme of the invention described above as can be known, the novel oil sprayer that the present invention relates to can realize that not only two-stage sprays, and compare with existing two-spring injector that other has following advantage.1, the two-level spring in the double-spring fuel injector can be installed on the pressure regulation plug screw as parts with supporting rod independently after adjusting pretightening force in advance on the supporting rod more together, the pretightening force of two-level spring and one-level spring and one-level lift h
1Three's adjustment is separate separately, can once adjust to the right place,, need repeated disassembled and assembled during Installation and Debugging unlike can not be separate separately between the existing two-spring injector three, therefore the debugging installation is convenient in the present invention, is easy to guarantee the conformity and the reliability of oil sprayer pre-spray performance.2, the pretightening force of two-level spring and one-level spring and one-level lift h in the double-spring fuel injector
1The three can all accurately be regulated by screw thread, do not adopt waste time and energy, inconvenience assembling and the pad accurately regulated.3, the two-level spring of novel oil sprayer inserts in the one-level spring, compares with the mode that two-stage spring in the prior art is arranged up and down, has reduced longitudinal size.4, in the present invention, cover stroke h when the oil nozzle spool
2After being hampered by nozzle holder, the one-level spring lower seat continues to move upward and also is hampered by the barrier force that supporting rod transmits downwards behind the Δ h, can not continue upwards to compress the one-level spring, also promptly stop it inertial force further to be converted into the potential energy of one-level spring, therefore the speed that the one-level spring lower seat moves downward is controlled in the scope of design in advance, thereby has reduced the impact load that produces when oil nozzle is closed.In other words, the additional load that produces on one-level spring and oil nozzle of the inertial force of one-level spring lower seat has obtained effective inhibition.
Description of drawings Fig. 1 is a kind of structural representation of the double-spring fuel injector that the present invention relates to, and 1 is tight cap, and 2 is oil nozzle, 2a is the oil nozzle spool, and 2b is the oil nozzle valve seat, and 3 is locating stud, 4 is the one-level spring lower seat, and 5 is nozzle holder, and 6 is the one-level spring, 7 is supporting rod, 8 is one-level pressure regulation plug screw, and 8a is a pressure regulation plug screw spill port, and 8b is a pressure regulation plug screw groove, rotatable pressure regulation plug screw 8 behind the instrument insertion 8b, 8c is a pressure regulation plug screw endoporus, and 8d is a pressure regulation plug screw oil return groove, and 9 is little locking nut, 10 are block, 10a is block oil return screw, and 11 is pad, and 12 is the two-level spring locking nut, 13 is big locking nut, 14 is the two-level spring seat of honour, and 15 is two-level spring, and 16 is bearing pin, 17 are following of two-level spring, h
1Be the one-level lift of spool 2a, h
2Total lift for spool 2a.
Fig. 2 is the enlarged view of a kind of mounting type of two-level spring 15 on supporting rod 7 among Fig. 1, and each sequence number indication part is identical with Fig. 1 on it.Newly-increased mark is as follows, and 7a is a groove, and instrument inserts the rotatable supporting rod 7 in back, and 17a is the dowel hole of being opened on following 17 of the two-level spring, h
3Poor for the length of the dowel hole 17a on following 17 of the two-level spring and bearing pin 16 diameters, h
3H
2, h
4Be the distance between following 17 of the lower end of supporting rod 7 and the two-level spring, h
4Also greater than h
2
Fig. 3 is the another kind of mounting type of two-level spring 15 on supporting rod 7, and Fig. 3 has cancelled the dowel hole 17a among Fig. 2, bearing pin 16 and h
3, in addition on following 17 of two-level spring, increase internal shoulder 17c, convex shoulder 7b outside the increase on supporting rod 7, with following 17 of fixing two-level spring, the meaning of other sequence number and mark representative is identical with Fig. 1 and Fig. 2.
Fig. 4 is the another kind of structural representation of the double-spring fuel injector that the present invention relates to, each sequence number indication part and h on it
1And h
2Meaning identical with Fig. 1, with the difference of scheme shown in Figure 12 points are arranged, first Fig. 4 newly establishes spill port 5a on nozzle holder 5, and with the block oil return screw 10a on the block 10 among Fig. 1 and this three places drainback passage cancellation of the pressure regulation plug screw spill port 8a on the one-level pressure regulation plug screw 8, pressure regulation plug screw oil return groove 8d; It two is that the upper end of one-level spring 6 is positioned at pressure regulation plug screw endoporus 8c in Fig. 4, then is positioned at the lower end of one-level pressure regulation plug screw 8 in Fig. 1.
Fig. 5 is the another kind of mounting type of supporting rod 7 on one-level pressure regulation plug screw 8, and in Fig. 5, the little locking nut 9 in Fig. 1 is cancelled, and other has increased pad 18, and the meaning of other sequence number and mark representative is identical with Fig. 1 and Fig. 2.
Embodiment Fig. 1 is a most preferred embodiment of the present invention, and its principle is as follows.In the process that oil sprayer is opened, 2a upwards covers stroke h when the oil nozzle spool
1After, one-level spring lower seat 4 meets with following 17 of two-level spring, and the active force of two-level spring 15 is passed _ is delivered on the oil nozzle spool 2a, and its speed that upwardly opens is slowed down, and reduces oil sprayer initial fuel injection amount to form the purpose of pre-spray thereby reach.For further strengthening the effect of pre-spray, oil nozzle 2 can be according to different burning chamber of diesel engine, and adopting pintle nozzle or China Patent No. respectively is 200310110802.X " a kind of hole type nozzle that can produce pre-spray ".2a continues to upwardly open along with the oil nozzle spool, covers whole stroke h
2After, being hampered by the lower end of nozzle holder 5, oil nozzle spool 2a is in the position of full open at this moment, forms the main injection of oil sprayer; After this one-level spring lower seat 4 continues to move upward and is supported the barrier force that bar 7 passes over behind the Δ h and blocks, make its compression one-level spring 6 that can not under action of inertia, continue to move upward, also just make it inertial force further can not be converted into the potential energy that gathers in the one-level spring 6, therefore the speed that one-level spring lower seat 4 moves downward when oil nozzle 2 is closed is controlled in the scope of design in advance, thereby has reduced the impact load that produces when oil nozzle 2 is closed.In other words, the additional load that produces in one-level spring 6 and oil nozzle 2 of the inertial force of one-level spring lower seat 4 has obtained effective inhibition.Make the two-level spring seat of honour 14 be arranged in pressure regulation plug screw endoporus 8c in Fig. 1, purpose is to shorten the length of oil sprayer.Fig. 2 is the enlarged view of two-level spring 15 mounting type on supporting rod 7 among Fig. 1.As seen from the figure, the barrier force of supporting rod 7 passes to one-level spring lower seat 4 by bearing pin 16 and following 17 of two-level spring, at this moment h
4H
3, Δ h=h
3+ h
1-h
2Certainly, work as h
4＜h
3The time, Δ h=h
4+ h
1-h
2, barrier force is directly passed to one-level spring lower seat 4 by the lower end of supporting rod 7.When mounted, the order that each part is installed on the supporting rod 7 is two-level spring locking nut 12, the two-level spring seat of honour 14, two-level spring 15, following 17 of two-level spring and bearing pin 16, after assembling, the pretightening force of two-level spring 15 is transferred to design load and detect errorless after, locking two-level spring locking nut 12, then each part collective is installed on the one-level pressure regulation plug screw 8 as parts, and inserts the center of one-level spring 6.One-level pressure regulation plug screw 8 adjust and by 13 lockings of big locking nut after, promptly adjust supporting rod 7 and upwards move back h by the upper end of one-level spring lower seat 4
1h
1Angle that can retreat according to supporting rod 7 rotation and supporting rod 7 convert with the thread pitch of one-level pressure regulation plug screw 8 mating parts, for example, when pitch is 1 millimeter, after supporting rod 7 rotations retreat 3.6 degree h are arranged then
1=0.01mm.
Two-level spring 15 and supporting rod 7 also can adopt the mounting type of Fig. 3, with fixing following 17 of the two-level spring of internal shoulder 17c and outer convex shoulder 7b.But this scheme can not suppress the inertial force of following 17 of two-level spring, Fig. 2 adopt bearing pin 16 fixedly the scheme of following 17 of two-level spring then can accomplish this point, so the scheme of Fig. 2 is better than the scheme of Fig. 3.When adopting the scheme of Fig. 3, Δ h=h
4+ h
1-h
2, barrier force passes to one-level spring lower seat 4 by the lower end of supporting rod 7.
Fig. 4 is an alternative embodiment of the invention.Compare with the scheme of Fig. 1, difference has 2 points, the first not only resembles and the two-level spring seat of honour 14 and two-level spring locking nut 12 is placed in the pressure regulation plug screw endoporus 8c Fig. 1, and the upper end of one-level spring 6 also placed pressure regulation plug screw endoporus 8c, this moment, two-level spring 15 can adopt belleville spring to shorten length where necessary; It two is to have cancelled pressure regulation plug screw spill port 8a, pressure regulation plug screw oil return groove 8d and block oil return screw 10a, and other establishes spill port 5a, so that the return line that oil sprayer is outer moves on to the side from the top, reduces longitudinal size.The embodiment of Fig. 1 also can only partly take above-mentioned measure selectively.
Fig. 5 is the another kind of mounting type that supporting rod 7 and one-level pressure regulation plug screw 8 can adopt.In Fig. 5, the little locking nut 9 among Fig. 1 is cancelled, and other has increased pad 18.The same prior art that is better than of scheme of this scheme and Fig. 1, need not the fuel pressure when removing to seek two-level spring between minimum and the peak injection pressure and begin to work during debugging in the moment that oil sprayer is opened, can measure and regulate the pretightening force of second level spring independently, but the scheme of Fig. 5 is when adjusting pad 18, the dismounting one-level again of still needing pressure regulation plug screw 8, and readjust the pretightening force of one-level spring 6, can not resemble and regulate h independently the scheme of Fig. 1
1, so the contained scheme of Fig. 5 is not as the scheme of Fig. 1.
In the most preferred embodiment of Fig. 1, h
2Less than h
3And h
4, so whole stroke h of oil nozzle spool 2a are h=h
2But if h
3＜h
4And h is arranged
2H
3+ h
1The time, the total kilometres h that oil nozzle spool 2a is then arranged is less than h
2, be h=h
3+ h
1Thereby, forming another embodiment different with most preferred embodiment noted earlier, this moment, oil nozzle spool 2a and one-level spring lower seat 4 will be hampered by the barrier force that supporting rod 7 transmits simultaneously behind the h that moves upward, and no longer included Δ h and existed.In this case, the load of each correlated parts will increase, and h also can be with h
1Difference and change, so this embodiment's scheme is good not as the scheme of Fig. 1 most preferred embodiment.In the most preferred embodiment of Fig. 1, the motion that stops oil nozzle spool 2a to make progress with the lower end of nozzle holder 5 earlier, the barrier force that transmits with supporting rod 7 motion that stops one-level spring lower seat 4 to make progress again, thus load has been resolved into two-part.Obviously, allow h among Fig. 1
2Less than h
3And h
4, to guarantee h=h
2Scheme the best.
Claims (5)
1. double-spring fuel injector, comprise tight cap (1), oil nozzle (2), one-level spring lower seat (4), nozzle holder (5), one-level spring (6), one-level pressure regulation plug screw (8), block (10), pad (11), big locking nut (13), it is characterized in that: further comprising a supporting rod (7) that is installed on the one-level pressure regulation plug screw (8), two-level spring (15) is installed on it, following of the two-level spring seat of honour (14) and two-level spring (17), supporting rod (7) inserts in the center hole of one-level springs (6) as parts with the two-level spring (15) that has regulated pretightening force on it, makes the two-stage spring in that size is overlapping longitudinally; In the process that oil nozzle (2) is opened, reach the h of prior setting when the stroke of oil nozzle spool (2a)
1After, at first meet with the lower end of two-level spring following (17) in the upper end of one-level spring lower seat (4), two-level spring (15) begins to work, (2a) imposes the power opposite with its moving direction to the oil nozzle spool, the speed that the oil nozzle spool (2a) that slows down upwardly opens, oil nozzle this moment (2) still is in the part oil mass pre-spray stage, after oil nozzle spool (2a) is covered whole stroke h and is obstructed, the part oil mass pre-spray stage finishes, oil nozzle (2) enters full oil mass main injection state, and so far oil sprayer oil nozzle (2) has been finished the overall process of opening.
2. double-spring fuel injector according to claim 1, it is characterized in that: after oil nozzle spool (2a) is covered whole stroke h and is hampered by nozzle holder (5), one-level spring lower seat (4) is hampered by the barrier force that supporting rod (7) transmits at the next motion △ h that upwards continues again of the effect of inertial force.
3. double-spring fuel injector according to claim 1, it is characterized in that: two-level spring following (17) is fixed on the supporting rod (7) by bearing pin (16); The two-level spring seat of honour (14) and supporting rod (7) to be being threaded, and locked by two-level spring locking nut (12) after the pretightening force that regulates two-level spring (15).
4. double-spring fuel injector according to claim 1 is characterized in that: supporting rod (7) and one-level pressure regulation plug screw (8) are regulating h to be threaded
1The back is locked by little locking nut (9).
5. double-spring fuel injector according to claim 1, it is characterized in that: the two-level spring seat of honour (14) are arranged in pressure regulation plug screw endoporus (8c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710085331XA CN100489300C (en) | 2007-01-15 | 2007-02-28 | Double-spring fuel injector |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710048254.0 | 2007-01-15 | ||
| CN200710048254 | 2007-01-15 | ||
| CNB200710085331XA CN100489300C (en) | 2007-01-15 | 2007-02-28 | Double-spring fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101144450A CN101144450A (en) | 2008-03-19 |
| CN100489300C true CN100489300C (en) | 2009-05-20 |
Family
ID=39207143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710085331XA Expired - Fee Related CN100489300C (en) | 2007-01-15 | 2007-02-28 | Double-spring fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100489300C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4398670A (en) * | 1980-08-06 | 1983-08-16 | Robert Bosch Gmbh | Fuel injection valve for an internal combustion engine |
| US4535939A (en) * | 1982-10-23 | 1985-08-20 | Lucas Industries Public Limited Company | Fuel injection nozzles |
-
2007
- 2007-02-28 CN CNB200710085331XA patent/CN100489300C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4398670A (en) * | 1980-08-06 | 1983-08-16 | Robert Bosch Gmbh | Fuel injection valve for an internal combustion engine |
| US4535939A (en) * | 1982-10-23 | 1985-08-20 | Lucas Industries Public Limited Company | Fuel injection nozzles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101144450A (en) | 2008-03-19 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
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