CN209067392U - A kind of plunger fuel injector and internal combustion engine - Google Patents
A kind of plunger fuel injector and internal combustion engine Download PDFInfo
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- CN209067392U CN209067392U CN201821876497.3U CN201821876497U CN209067392U CN 209067392 U CN209067392 U CN 209067392U CN 201821876497 U CN201821876497 U CN 201821876497U CN 209067392 U CN209067392 U CN 209067392U
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- plunger
- fuel injector
- upper plug
- wall
- hole
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Abstract
The utility model discloses a kind of plunger fuel injector and internal combustion engines, belong to technical field of internal combustion engines.The utility model plunger fuel injector includes ontology, lower plunger, upper plug and the first resetting apparatus, plunger hole is provided on ontology, fluid inlet to be sprayed, jet port and lubricating oil inlet, lower plunger and the equal snug sliding fit of upper plug are in plunger hole, jet chamber is formed between the lower end of lower plunger and the inner wall of plunger hole, fluid inlet and jet port to be sprayed are connected to jet chamber, the lower end of lower plunger is used to open or closes jet port, the lower end of upper plug, lubricant reservoir is formed between the upper end of lower plunger and the inner wall of plunger hole, lubricating oil inlet is connected to by check valve with lubricant reservoir, first resetting apparatus is used to provide the power of downlink to upper plug.The utility model can avoid the problem that leakage while mentioning high injection pressure, and can carry out effectively lubricating to plunger.
Description
Technical field
The utility model relates to technical field of internal combustion engines more particularly to a kind of plunger fuel injectors and internal combustion engine.
Background technique
In recent years, on the one hand, in order to cope with increasingly harsh emission request, the injection pressure of diesel engine is higher and higher, surpasses
High-pressure injection brings better fuel atomization effect, while also bringing leakage and the wear problem of fuel injector.On the other hand, first
The substitute fuels such as alcohol, ethyl alcohol, dimethyl ether also obtain certain research and application on internal combustion engine, and have what is expanded rapidly to become
Gesture.But these substitute fuels and these low viscosity fluids including gasoline, height is being carried out using traditional fuel injector
When pressure injection, because viscosity is low, leakage is big, and self-lubricating property is poor, so that the raising of injection pressure is more and more difficult, plunger and column
It is much harder when the abrasion of consent is than using diesel oil, influence the reliability and durability of fuel injector.
Utility model content
The purpose of this utility model is that proposing a kind of column that can mitigate leakage problem while mentioning high injection pressure
Fill in fuel injector and internal combustion engine.
For this purpose, on the one hand, the utility model uses following technical scheme:
A kind of plunger fuel injector, comprising:
Ontology is provided with plunger hole, fluid inlet to be sprayed, jet port and lubricating oil inlet；
Lower plunger, for snug sliding fit in the plunger hole, the lower end of the lower plunger is interior with the plunger hole
Jet chamber is formed between wall, the fluid inlet to be sprayed and the jet port are connected to the jet chamber, the lower plunger
Lower end be used to open or close the jet port；
Upper plug, snug sliding fit in the plunger hole, the lower end of the upper plug, the lower plunger upper end
Lubricant reservoir is formed between the inner wall of the plunger hole, the lubricating oil inlet passes through the first check valve and the lubricant reservoir
Connection；And
First resetting apparatus is used to provide the power of downlink to the upper plug.
Further, the plunger fuel injector further includes limiting device, and the limiting device is for limiting the upper plug
The minimum point of downlink.
Further, the limiting device includes the inner wall of the plunger hole and one of the upper plug is upper is arranged
The confined planes for being abutted with the retention bead being arranged in retention bead, another one.
Further, the retention bead is the limit stop ring being arranged on the plunger hole inner wall, and the confined planes are
The lower end surface of the upper plug or the confined planes are the step surface for being set to the middle part or lower part of the upper plug.
Further, first resetting apparatus is between the top of the upper plug and the inner wall of the plunger hole
The first elastic component.
Further, the plunger fuel injector further includes the second elastic component, and second elastic component is used for the lower prop
Plug provides the power of downlink.
Further, the pretightning force of first elastic component is greater than the pretightning force of second elastic component.
Further, oil revolute chamber, the oil revolute chamber are formed between the upper end of the upper plug and the inner wall of the plunger hole
On be provided with lubricating oil outlet.
Further, the fluid inlet to be sprayed is connected to by solenoid valve or second one-way valve with the jet chamber.
On the other hand, the utility model uses following technical scheme:
A kind of internal combustion engine, including plunger fuel injector described in any of the above embodiments.
The beneficial effects of the utility model are as follows:
Plunger fuel injector provided by the utility model and the internal combustion engine including the fuel injector, tool is there are two plunger, and two
The lubricant reservoir being connected to by the first check valve with lubricating oil inlet, lubricant reservoir are limited between plunger and the inner wall of plunger hole
In lubricating oil pressure can with injection Fluid pressure variation and change so that two end faces of lower plunger were born
Pressure is roughly equal, and due to lower plunger and plunger hole precision-fit, there was only very small annular gap therebetween, theoretically may be used
To guarantee the lubrication pressure dynamic balance in fuel oil and lubricant reservoir in jet chamber, will not occur to leak and blend phenomenon, it can be with
Leakage is avoided the problem that while improving the injection pressure of fuel；Meanwhile plunger is during up and down motion, in lubricant reservoir
Remaining lubricating oil can guarantee to carrying out effectively lubricating between plunger and plunger hole inner wall on wall.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the plunger fuel injector that specific embodiment of the present invention provides.
Appended drawing reference:
1, ontology；2, lower plunger；3, upper plug, the 4, first resetting apparatus；5, fluid inlet to be sprayed；6, jet port；7,
Lubricating oil inlet；8, jet chamber, 9, lubricant reservoir；10, the first check valve；11, the second elastic component；12, retention bead, 13, limit
Plane；14, oil revolute chamber；15, oil return exports.
Specific embodiment
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it should be understood that term " on ", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "top", "bottom", "inner", "outside" be orientation based on the figure or
Positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
Present embodiment provides a kind of plunger fuel injector, be used for into body of the internal-combustion engine spray fuel oil, methanol,
The fuel such as ethyl alcohol, dimethyl ether are introduced in this specific implementation by taking jet body to be painted is fuel oil as an example.
As shown in Figure 1, the plunger fuel injector that present embodiment provides includes ontology 1, lower plunger 2, upper plug 3 and the
One resetting apparatus 4 is provided with plunger hole, fluid inlet to be sprayed 5, jet port 6 and lubricating oil inlet 7 on ontology 1.Lower plunger 2
With upper plug 3 along the axial snug sliding fit of plunger hole in plunger hole, snug sliding fit refers to lower plunger 2 and upper prop
The outer diameter of plug 3 is respectively equal to or is slightly less than the internal diameter of plunger hole, slides being able to satisfy lower plunger 2 and upper plug 3 along plunger hole
Under the premise of, the gap between lower plunger 2 and upper plug 3 and plunger hole is as small as possible.The axis of lower plunger 2 and the axis of upper plug 3
Line is preferred but is not limited to conllinear.Lower plunger 2 is located at the lower section of upper plug 3, between the lower end of lower plunger 2 and the inner wall of plunger hole
Form jet chamber 8, fluid inlet 5 and jet port 6 to be sprayed be connected to jet chamber 8, the lower end of lower plunger 2 be used to open or
Close jet port 6.For the ease of control, fluid inlet 5 to be sprayed connects preferably by check valve or solenoid valve and jet chamber 8
It is logical.It can also be not provided with any valve at fluid inlet 5 to be sprayed, but controlled and sprayed by the pressure of jet body to be painted.Lower prop
The lower end of plug 2 is preferred but is not limited to tapered, the exterior contour phase of the in-profile of jet port 6 and the lower end of lower plunger 2
Match, forms needle-valve between the lower end and jet port 6 of lower plunger 2.The lower end of upper plug 3, the upper end of lower plunger 2 and plunger hole it is interior
Lubricant reservoir 9 is formed between wall, lubricating oil inlet 7 is connected to by the first check valve 10 with lubricant reservoir 9, in lubricant reservoir 9
Lubricating oil is used to provide the power moved downward to lower plunger 2 in the injection of plunger fuel injector.Lower plunger 2 and upper plug 3 and plunger
Gap between hole is as small as possible, can be to avoid the mutual leakage between lubricating oil and fuel oil.First resetting apparatus 4 is used for upper plug
3 provide downlinks power, wherein downlink be moved downward along plunger hole, i.e. the first resetting apparatus 4 be used for upper plug 3 provide to
The power moved close to the direction of lower plunger 2.
The plunger fuel injector that present embodiment provides, tool is there are two plunger, and the inner wall of two plungers and plunger hole
Between limit the lubricant reservoir 9 being connected to by the first check valve 10 with lubricating oil inlet, the pressure of the lubricating oil in lubricant reservoir 9
Power can change with the variation of Fluid pressure to be sprayed, so that the pressure substantially phase that two end faces of lower plunger 2 are born
Deng, and due to lower plunger 2 and plunger hole precision-fit, only very small annular gap, can theoretically guarantee therebetween
The lubrication pressure dynamic balance in fuel oil and lubricant reservoir 9 in jet chamber 8 will not occur to leak and blend phenomenon, can mention
Leakage is avoided the problem that while the injection pressure of high fuel；Meanwhile plunger is during up and down motion, lubricant reservoir 9 it is interior
Remaining lubricating oil can guarantee to carrying out effectively lubricating between plunger and plunger hole inner wall on wall.
In present embodiment, the first resetting apparatus 4 is preferred but is not limited to the first elastic component.First elastic component is preferred
But it is not limited to spring.When first elastic component is spring, the axis of axis and upper plug 3 is preferred but is not limited to conllinear.The
When one elastic component is spring, both ends are abutted with the inner wall of the upper surface of upper plug 3 and plunger hole respectively.In order to be conducive to needle-valve
It is effective close and the absorption of lubricating oil, plunger fuel injector further include the second elastic component 11, the second elastic component 11 is used for lower prop
Plug 2 provides the power of downlink, i.e. the second elastic component 11 is used to provide the power moved to the direction far from upper plug 3 to lower plunger 2.The
Two elastic components 11 are preferred but are not limited to spring.The axis of the axis of second elastic component 11 and lower plunger 2 preferably but is not limited to
Collinearly.The both ends of second elastic component 11 abut the upper surface of lower plunger 2 and the inner wall of plunger hole respectively.The preload of first elastic component
Power is greater than the pretightning force of the second elastic component 11.The pretightning force of first elastic component and the second elastic component 11 refers to the two at fuel injector
The elastic force provided by difference when non-working condition.The power of lower 2 downlink of plunger is by the profit in the second elastic component 11 and lubricant reservoir 9
Lubricating oil pressure provides, and the pretightning force of the second elastic component 11 is usually smaller, in the lubricating oil pressure in lubricant reservoir 9 and jet chamber 8
Fuel pressure be still able to maintain it is of substantially equal.
Plunger fuel injector further includes limiting device, and limiting device is used to limit the minimum point of 3 downlink of upper plug.Limiting device
Structure it is unlimited, in order to simplify structure, limiting device includes in the inner wall and upper plug 3 of plunger hole in present embodiment
The confined planes 13 for being abutted with retention bead 12 being arranged in the retention bead 12 that is arranged in one, another one.This is specific real
It applies in mode, retention bead 12 is the limit stop ring being arranged on plunger hole inner wall, and the lower end surface of upper plug 3 is confined planes 13；
The middle part or lower part that upper plug 3 can also either be enabled form step surface, and the step surface is as confined planes 13.Limit stop ring can be with
It is detachably accepted in the groove on plunger hole inner wall, limit stop ring can also be structure as a whole with the inner wall of plunger hole.
In other embodiments, retention bead 12 can also be enabled to be set on 3 upper surface of upper plug, confined planes 13 are to be arranged in column
Step surface on consent inner wall.
Limiting device does not continue to downlink after making upper plug 3 come downwards to the minimum point of downlink, and lower plunger 2 continues to transport
One slight distance of downlink just reaches its downlink minimum point, thus the volume of lubricant reservoir 9 is slightly increased, pressure reduction, and first is single
It opens to valve 10 to replenish the lubricating oil that pump oil is revealed in the process to lubricant reservoir 9.Limiting device can also be avoided effectively
Plunger 3 is used for the case where being connected to the part of plunger hole precision-fit with lubricating oil inlet 7.
As shown in Figure 1, forming oil revolute chamber 14 between the upper end of upper plug 3 and the inner wall of plunger hole, it is arranged in oil revolute chamber 14
There is lubricating oil outlet, can go out from the micro lubricating oil oozed out in the small annular gap of upper plug 3 and plunger hole from lubricating oil
Mouth flow back into engine lubrication system.
Present embodiment additionally provides a kind of internal combustion engine comprising above-mentioned plunger fuel injector.
Below in conjunction with Fig. 1, the working principle of the plunger fuel injector of present embodiment offer is briefly introduced:
After high pressure fuel enters jet chamber 8 from fluid inlet 5 to be sprayed, one can be generated to lower plunger 2 and upward is pushed away
Power, after pressure is more than that fuel injector sprays power, lower plunger 2 overcomes the pretightning force of the second elastic component 11 to be lifted upwards, at this moment, needle
Valve is opened, and fuel oil is sprayed from jet port 6 to be atomized, and starts pre- spray.Meanwhile because lower plunger 2 is lifted up, so that lubricant reservoir 9
In lubricating oil pressure increase, the lubricating oil in lubricant reservoir 9 pushes upper plug 3 that the pretightning force of the first elastic component is overcome to lift upwards
It rises, needle-valve opening travel further increases, and injection velocity is accelerated, into the main jet stage.Due to the pretightning force ratio of the first elastic component
Second elastic component 11 it is much greater, so the lubricating oil pressure in lubricant reservoir 9 and the fuel pressure in jet chamber 8 are still basic
It is equal.In the case where lower 2 pressure at two ends of plunger is balanced, and due to lower plunger 2 and plunger hole precision-fit, therebetween only
Very small annular gap can theoretically guarantee the lubrication pressure dynamic balance in the fuel oil and lubricant reservoir 9 in jet chamber 8, no
Lubricating oil and fuel blow and blending phenomenon can occur, asking for leakage can be avoided while improving the injection pressure of fuel
Topic；Meanwhile lower plunger 2 is during up and down motion, remaining profit in the small annular gap between lower plunger 2 and plunger hole inner wall
Lubricating oil can guarantee to carry out effectively lubricating between lower plunger 2 and plunger hole inner wall.
When end of injection, 8 fuel pressure of jet chamber is drastically reduced, 3 downlink of the first resilient element urges upper plug, lubricant reservoir
The elastic force of lubricating oil pressure and the second elastic component 11 in 9 pushes lower 2 downlink of plunger jointly, and reaching minimum point in lower plunger 2 makes
Before obtaining needle-valve closing, limit stop ring abuts upper plug 3 and it is prevented to continue to move downward, at this moment, because lower plunger 2 is in the second bullet
Property part 11 elastic force effect under continue to run down a micro-stroke to close needle-valve, the volume of lubricant reservoir 9 increases, lubrication
Oil pressure reduce, engine lubrication system generate low pressure lubricating oil can be pushed open from lubricating oil inlet 7 first check valve 10 into
Enter lubricant reservoir 9, because of a small amount of lubricating oil of micro filter loss during fuel postinjection.From upper plug 3 and plunger hole inner wall
The micro lubricating oil oozed out in small annular gap can flow back into engine lubrication system from lubricating oil outlet.
Technical principle of the utility model has been described above with reference to specific embodiments.These descriptions are intended merely to explain this reality
With novel principle, and it cannot be construed to the limitation to scope of protection of the utility model in any way.Based on the explanation herein,
Those skilled in the art, which does not need to pay for creative labor, can associate with other specific implementation modes of this utility model,
These modes are fallen within the protection scope of the utility model.
Claims (10)
1. a kind of plunger fuel injector characterized by comprising
Ontology (1) is provided with plunger hole, fluid inlet to be sprayed (5), jet port (6) and lubricating oil inlet (7)；
Lower plunger (2), snug sliding fit is in the plunger hole, lower end and the plunger hole of the lower plunger (2)
Jet chamber (8) are formed between inner wall, the fluid inlet (5) to be sprayed and the jet port (6) connect with the jet chamber (8)
Logical, the lower end of the lower plunger (2) is used to open or closes the jet port (6)；
Upper plug (3), snug sliding fit is in the plunger hole, the lower end of the upper plug (3), the lower plunger (2)
Upper end and the plunger hole inner wall between formed lubricant reservoir (9), the lubricating oil inlet (7) pass through the first check valve
(10) it is connected to the lubricant reservoir (9)；And
First resetting apparatus (4) is used to provide the power of downlink to the upper plug (3).
2. plunger fuel injector according to claim 1, which is characterized in that
The plunger fuel injector further includes limiting device, and the limiting device is for limiting the minimum of the upper plug (3) downlink
Point.
3. plunger fuel injector according to claim 2, which is characterized in that the limiting device includes the interior of the plunger hole
What is be arranged in the upper retention bead (12) being arranged of one of wall and the upper plug (3), another one is used for and the limit convex
Play the confined planes (13) that (12) abut.
4. plunger fuel injector according to claim 3, which is characterized in that
The retention bead (12) is the limit stop ring being arranged on the plunger hole inner wall, and the confined planes (13) are on described
The lower end surface of plunger (3) or the confined planes (13) are the step surface for being set to the middle part or lower part of the upper plug (3).
5. plunger fuel injector according to any one of claims 1 to 4, which is characterized in that first resetting apparatus (4) is
The first elastic component between the top of the upper plug (3) and the inner wall of the plunger hole.
6. plunger fuel injector according to claim 5, which is characterized in that the plunger fuel injector further includes the second elastic component
(11), second elastic component (11) is used to provide the power of downlink to the lower plunger (2).
7. plunger fuel injector according to claim 6, which is characterized in that the pretightning force of first elastic component is greater than described
The pretightning force of second elastic component (11).
8. plunger fuel injector according to any one of claims 1 to 4, which is characterized in that the upper end of the upper plug (3) with
Oil revolute chamber (14) are formed between the inner wall of the plunger hole, are provided with lubricating oil outlet on the oil revolute chamber (14).
9. plunger fuel injector according to any one of claims 1 to 4, which is characterized in that the fluid inlet (5) to be sprayed
It is connected to by solenoid valve or second one-way valve with the jet chamber (8).
10. a kind of internal combustion engine, which is characterized in that including plunger fuel injector according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821876497.3U CN209067392U (en) | 2018-11-14 | 2018-11-14 | A kind of plunger fuel injector and internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821876497.3U CN209067392U (en) | 2018-11-14 | 2018-11-14 | A kind of plunger fuel injector and internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209067392U true CN209067392U (en) | 2019-07-05 |
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ID=67099168
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821876497.3U Active CN209067392U (en) | 2018-11-14 | 2018-11-14 | A kind of plunger fuel injector and internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209710A (en) * | 2018-11-14 | 2019-01-15 | 上海华羿汽车系统集成有限公司 | A kind of plunger fuel injector and internal combustion engine |
-
2018
- 2018-11-14 CN CN201821876497.3U patent/CN209067392U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209710A (en) * | 2018-11-14 | 2019-01-15 | 上海华羿汽车系统集成有限公司 | A kind of plunger fuel injector and internal combustion engine |
| WO2020098179A1 (en) * | 2018-11-14 | 2020-05-22 | 上海华羿汽车系统集成有限公司 | Plunger fuel injector and internal combustion engine |
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