CN100410527C - Plunger matching parts of using dual plunger - Google Patents
Plunger matching parts of using dual plunger Download PDFInfo
- Publication number
- CN100410527C CN100410527C CNB2006100475862A CN200610047586A CN100410527C CN 100410527 C CN100410527 C CN 100410527C CN B2006100475862 A CNB2006100475862 A CN B2006100475862A CN 200610047586 A CN200610047586 A CN 200610047586A CN 100410527 C CN100410527 C CN 100410527C
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- China
- Prior art keywords
- plunger
- big
- small
- oil
- little spring
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- 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
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- 230000009977 dual effect Effects 0.000 title 1
- 239000011148 porous material Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 abstract description 18
- 239000000295 fuel oil Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 29
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 238000007599 discharging Methods 0.000 description 7
- 239000007921 spray Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
A plunger couple element with double plunger is featured as moving small plunger relatively to big plunger for realizing low oil supply rate by sucking partial fuel oil into big plunger cavity when oil is supplied by big plunger then moving two said plungers simultaneously for realizing higher oil supply rate to finalize oil supply process of supplying oil slowly first and then supplying oil quickly.
Description
Technical field
The present invention relates to a kind of plunger coupled parts that adopts double-plunger, it belongs to the diesel fuel-injection apparatus field.
Background technique
Along with the more and more strictness of Abgasgesetz, an urgent demand reduces discharging, noise and the vibration of diesel engine, for this burning and fuel injection system to diesel engine all will improve in recent years.Experimental study both domestic and external proves, adopts the combustion noise and the vibration of pre-spray measure can the reduction effectively diesel engine, and in conjunction with high-pressure injection, can make diesel engine when obtaining than low NOx drainage, also can reduce the PM discharging.If particularly diesel engine injection rate under idling and little load condition is too high, strong vibration and noise will be produced, need under the situation of the higher total fuel injection rate of maintenance, reduce initial stage injection rate, the injection rate under control diesel engine idling and the little load condition for this reason.By changing the fuel supply rate curve of Injection Pump, the discharging of adopting anxious fuel supply rate curve in slow earlier back and pre-spray technology then can reduce diesel engine effectively, and reduce vibration and noise simultaneously.
Summary of the invention
The invention provides a kind of plunger coupled parts that adopts double-plunger, make diesel engine injection rate in the early stage lower, then still keep higher injection rate, can reduce the discharging of diesel engine effectively, and reduce vibration and noise simultaneously in the later stage.
The technical solution adopted for the present invention to solve the technical problems is:, a kind of plunger coupled parts that adopts double-plunger, it mainly is made up of a big plunger, a small plunger and a plunger bushing, small plunger is positioned at big plunger and forms a plunger unit, and this plunger unit is contained in and constitutes one pair of even part in the plunger bushing.In above-mentioned big plunger, load onto described small plunger earlier, put into a little spring again, be screwed into the tapped hole of an end of putting into above-mentioned little spring of big plunger then with screw-cap; The other end at big plunger is the hole that pressure oil end is provided with straight-through small plunger end.
Above-mentioned small plunger is provided with a limited post in the end that little spring is installed.
Above-mentioned screw-cap is provided with a limited post in the end that little spring is installed, and is provided with vertical pore and horizontal pore in screw-cap.
The guiding theory of technique scheme is: at first fuel cam drives big plunger, close oil inlet hole at big plunger, when pressure has risen to spray pressure, act on small plunger at fluid power and move and compress little spring, make and press in the process of oil at big plunger, small plunger is done reversing motion with respect to big plunger, realizes slow and a spot of phase I fuel feeding; Along with cam is rotated further, when small plunger was compressed to limit position to little spring, big small plunger pumped fuel oil together, and promptly quick fuel feeding is realized the second stage fuel feeding.The phase I fuel feeding can form the pre-spray of internal combustion oil of cylinder, and second stage fuel feeding subsequently forms the main injection of fuel oil, and the fuel supply rate curve of diesel engine and fuel injection characteristic all will change to some extent like this, reaches the purpose of improving burning, reducing discharging.
The invention has the beneficial effects as follows: the plunger coupled parts of this employing double-plunger, because small plunger moves with respect to big plunger when big plunger fuel feeding at the beginning, the part fuel oil is sucked the lower oil-supply speed of realization in the big plunger cavity, big then plunger and small plunger move together and realize higher oil-supply speed, have so just realized the anxious fuel supply rate curve in first slow back.Therefore, adopt the plunger coupled parts of double-plunger can significantly improve diesel engine combustion, reduce the NOx and the PM discharging of diesel engine, also can reduce the vibration and the noise of diesel engine simultaneously.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a kind of structure sectional view that adopts the plunger coupled parts of double-plunger.
Fig. 2 is a kind of pump nozzle arrangements sectional view that adopts the plunger coupled parts of double-plunger.
Fig. 3 is a kind of pump modular construction sectional view that adopts the plunger coupled parts of double-plunger.
Among the figure: 1, big plunger, 1a, hole, 2, small plunger, 2a, limited post, 2b, small plunger top, 3, little spring, 4, screw-cap, 4a, limited post, 4b, vertical pore, 4c, horizontal pore, 5, plunger bushing, 5a, oil inlet hole, 5b, pump nozzle plunger cover, 5c, pump unit plunger bushing, 6, tappet, 7, Returnning spring, 8, fuel supply chamber, 9, oil nozzle, 10, outlet valve, 11, Returnning spring, 12, spacer.
Embodiment
In the embodiment shown in fig. 1, adopt the plunger coupled parts of double-plunger to form, on plunger bushing 5, be provided with oil inlet hole 5a by a plunger unit and a plunger bushing 5.Plunger unit is made up of big plunger 1, small plunger 2, little spring 3 and screw-cap 4.In big plunger 1, load onto a small plunger 2 earlier, put into a little spring 3 again, be screwed in the tapped hole of big plunger 1 one ends with screw-cap 4 then, just formed a plunger unit.The pretightening force of little spring 3 can be adjusted by spacer 12, is provided with the hole 1a of straight-through small plunger top 2b at the pressure oil end of big plunger 1.Small plunger 2 is provided with a limited post 2a in the end that little spring 3 is installed, and screw-cap 4 also is provided with a limited post 4a in the end that little spring 3 is installed, and the effect of two limited posts is maximum displacements of control small plunger 2.In screw-cap 4, be provided with vertical pore 4b and horizontal pore 4c, its objective is to allow the little spring chamber of small plunger 2 lead to atmosphere, so that the unrestricted motion of small plunger 2.
In the embodiment shown in Figure 2, the driving cam of pump nozzle acts on the tappet 6, the pretightening force that the big plunger 1 of direct driving overcomes Returnning spring 7 moves downward, after big plunger 1 is closed filler opening, because the fluid power effect, make pretightening force that small plunger 2 overcomes little spring 3 with respect to big plunger row upwards, with the part fuel oil in the fuel supply chamber 8 in hole 1a sucks big plunger 1, another part fuel oil directly pumps into oil nozzle 9, realizes the phase I fuel feeding; When cam is rotated further, up to the limited post 2a of small plunger 2 upper-end surfaces and huge pillar beyond the Great Wall screw-cap 4 lower end surface limited post 4a contact, small plunger 2 rises to limit position with respect to big plunger 1, relative movement no longer takes place and with same speed fuel feeding at this moment big plunger 1 and small plunger 2, realize the second stage fuel feeding, promptly quick fuel feeding.
In the embodiment shown in fig. 3, the driving cam of pump unit acts on the screw-cap 4, the pretightening force that the big plunger 1 of direct driving overcomes Returnning spring 11 moves upward, after big plunger 1 is closed filler opening, because the fluid power effect, the pretightening force that makes small plunger 2 overcome little spring 3 is gone downwards with respect to big plunger, with the part fuel oil in the fuel supply chamber in hole 1a sucks big plunger 1, another part fuel oil directly pumps into high-pressure oil pipe to oil nozzle through outlet valve 10, realizes the phase I fuel feeding; When cam is rotated further, up to the limited post of small plunger 2 upper-end surfaces and huge pillar beyond the Great Wall screw-cap 4 lower end surface limited posts contact, small plunger 2 drops to limit position with respect to big plunger 1, relative movement no longer takes place and with same speed fuel feeding at this moment big plunger 1 and small plunger 2, realize the second stage fuel feeding, promptly quick fuel feeding.
In sum, no matter be pump nozzle or pump unit, as long as adopt the plunger coupled parts of double-plunger, the phase I fuel feeding can form the pre-spray of internal combustion oil of cylinder, second stage fuel feeding subsequently forms the main injection of fuel oil, the fuel supply rate curve of diesel engine and fuel injection characteristic all will change to some extent like this, reach the purpose of improving burning, reducing discharging and noise.
Claims (3)
1. plunger coupled parts that adopts double-plunger, it mainly is made up of a big plunger (1), a small plunger (2) and a plunger bushing (5), small plunger (2) is positioned at big plunger (1) and forms a plunger unit, and this plunger unit is contained in and constitutes one pair of even part in the plunger bushing (5); It is characterized in that: in above-mentioned big plunger (1), load onto described small plunger (2) earlier, put into a little spring (3) again, use screw-cap (4) to be screwed into the tapped hole of an end of putting into above-mentioned little spring of big plunger (1) then; The other end at big plunger (1) is the hole (1a) that pressure oil end is provided with straight-through small plunger (2) end.
2. according to the plunger coupled parts of the described employing double-plunger of claim 1, it is characterized in that: above-mentioned small plunger (2) is provided with a limited post (2a) in the end that little spring (3) is installed.
3. according to the plunger coupled parts of claim 1 or 2 described employing double-plunger, it is characterized in that: above-mentioned screw-cap (4) is provided with a limited post (4a) in the end that little spring (3) is installed, and is provided with vertical pore (4b) and horizontal pore (4c) in screw-cap (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100475862A CN100410527C (en) | 2006-08-28 | 2006-08-28 | Plunger matching parts of using dual plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100475862A CN100410527C (en) | 2006-08-28 | 2006-08-28 | Plunger matching parts of using dual plunger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1916389A CN1916389A (en) | 2007-02-21 |
| CN100410527C true CN100410527C (en) | 2008-08-13 |
Family
ID=37737436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100475862A Expired - Fee Related CN100410527C (en) | 2006-08-28 | 2006-08-28 | Plunger matching parts of using dual plunger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100410527C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2490292A1 (en) * | 1980-09-17 | 1982-03-19 | Unic Sa | Double acting fluid ram - has sliding piston in form of sheath pressed in both directions by two springs |
| GB2231097A (en) * | 1989-01-13 | 1990-11-07 | Bosch Gmbh Robert | Hand-operated pump for a feed pump of a fuel injection system for an internal combustion engine |
| US5188074A (en) * | 1991-08-13 | 1993-02-23 | Robert Bosch Gmbh | Fuel injection pump for internal combustion engines |
| CN1134510A (en) * | 1994-12-13 | 1996-10-30 | 斯塔纳戴恩机动公司 | Fuel injection pump with auxiliary control system |
| CN1811159A (en) * | 2006-01-27 | 2006-08-02 | 大连理工大学 | Double-plunger oil supplying pump |
-
2006
- 2006-08-28 CN CNB2006100475862A patent/CN100410527C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2490292A1 (en) * | 1980-09-17 | 1982-03-19 | Unic Sa | Double acting fluid ram - has sliding piston in form of sheath pressed in both directions by two springs |
| GB2231097A (en) * | 1989-01-13 | 1990-11-07 | Bosch Gmbh Robert | Hand-operated pump for a feed pump of a fuel injection system for an internal combustion engine |
| US5188074A (en) * | 1991-08-13 | 1993-02-23 | Robert Bosch Gmbh | Fuel injection pump for internal combustion engines |
| CN1134510A (en) * | 1994-12-13 | 1996-10-30 | 斯塔纳戴恩机动公司 | Fuel injection pump with auxiliary control system |
| CN1811159A (en) * | 2006-01-27 | 2006-08-02 | 大连理工大学 | Double-plunger oil supplying pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1916389A (en) | 2007-02-21 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20080813 Termination date: 20110828 |