CN101338717A - In-cylinder direct-injection gasoline engine - Google Patents
In-cylinder direct-injection gasoline engine Download PDFInfo
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- CN101338717A CN101338717A CNA2007100435041A CN200710043504A CN101338717A CN 101338717 A CN101338717 A CN 101338717A CN A2007100435041 A CNA2007100435041 A CN A2007100435041A CN 200710043504 A CN200710043504 A CN 200710043504A CN 101338717 A CN101338717 A CN 101338717A
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- cylinder
- oil nozzle
- injection nozzle
- oil injection
- petrol engine
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- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The present invention discloses a direct injection gasoline engine which comprises a cylinder and an oil injection nozzle, the front end of which is inserted into the cylinder. The front end of the oil injection nozzle is provided with a layer of heat insulating layer. The heat insulating layer is added at the outer surface of the front end of the oil injection nozzle which is contacted with high temperature gas, thus, the heat transmission of the gas in a combustion chamber to the oil injection nozzle is reduced, thereby ensuring that the temperature of the internal flow passage wall face of the oil injection nozzle is reduced and avoiding the coking and the jam of gasoline caused by physiochemical change under high temperature. At the same time, the heat insulating layer at the outer surface of the front end of the oil injection nozzle increases the temperature of the outer surface, is good for the oxygenation of carbon distribution on the surface and reduces the possibility of jam further.
Description
Technical field
The present invention relates to a kind of petrol engine, particularly relate to a kind of direct spray petrol engine in cylinder.
Background technique
Direct spray petrol engine in cylinder (DISI) is a kind of new gasoline engine combustion system.Different with the electronic injection gasoline engine of routine, the oil nozzle of direct spray petrol engine in cylinder mixes with air in the cylinder mutually with in the gasoline DCI direct cylinder injection.Because all benefits that this oil gas hybrid mode is brought, direct spray petrol engine in cylinder is obtaining application more and more widely.Motor corporation begins to adopt in a large number under the situation of direct spray petrol engine in cylinder abroad, and domestic automobile company also successively begins the exploitation to direct spray petrol engine in cylinder.
The oil nozzle of direct spray petrol engine in cylinder is mounted on the engine cylinder cover combustion chamber wall surface.The front end of oil nozzle directly and the interior high-temperature fuel gas of cylinder contact.This makes oil nozzle that the coking and blocking phenomenon can take place, and has directly influenced the normal operation of motor.The gasoline high to domestic manganese content, oil nozzle coking and blocking phenomenon is even more serious.Germany BOSCH company once experimentized the domestic gasoline of research at home to the problem of oil nozzle coking and blocking, need to find regularly in gasoline doping to clear up collection carbon on the oil nozzle.
Because temperature is very big to the influence of oil nozzle coking and blocking,, often oil nozzle is placed colder air inlet side in the design of direct spray petrol engine in cylinder combustion system, below between the twin-inlet for reducing the coking and blocking phenomenon.Nonetheless, the oil nozzle coking and blocking is still a problem.People recognize and place oil nozzle the cylinder central authorities of cylinder cap more favourable to the work of in-cylinder direct injection in recent years.Because higher in the cylinder cap bottom surface at cylinder center temperature, the oil nozzle coking and blocking problem more needs to pay close attention to.
After the operating temperature of gasoline oil nozzle increased, two problems can appear.The one, physicochemical change at high temperature can take place in gasoline, has sediments coking on the runner wall of gasoline in oil nozzle to occur.Because motor is worked in a looping fashion, oil spout is interrupted, and the gasoline in the oil nozzle inner flow passage flows also off and on.When the oil nozzle temperature was too high, the gasoline that does not temporarily have in the oil nozzle to flow can be heated, and physicochemical change takes place, and produces sediments, in the coking of runner wall deposition, stopped up runner gradually.
Another phenomenon is to have a small amount of liquid gasoline after the gasoline injection for various reasons to be distributed on the spray nozzle front end outer surface.Spray nozzle front end surface formation rich mixture layer is being close in these gasoline evaporation backs.In engine combustion process, this layer rich mixture produces soot.The part soot can be bonded on the wall, forms carbon distribution.The carbon progressive additive causes spray orifice to be blocked at last.
Summary of the invention
The technical problem to be solved in the present invention provides the direct spray petrol engine in cylinder that a kind of oil nozzle is difficult for taking place obstruction.
In order to solve the problems of the technologies described above, the present invention adopts following technological scheme: a kind of direct spray petrol engine in cylinder, comprise that cylinder and front end insert the oil nozzle in the cylinder, the oil nozzle front end has one or more spray orifices, and the front end that described oil nozzle contacts with high-temperature fuel gas is provided with one deck heat insulation layer.
The present invention has increased heat insulation layer at the outer surface that the oil nozzle front end contacts with high-temperature fuel gas, the burning indoor gas reduces to the heat transfer of oil nozzle like this, the temperature of oil nozzle inner flow passage wall is reduced, avoided gasoline at high temperature physicochemical change to take place and the coking and blocking that causes.Meanwhile, the heat insulation layer on the oil nozzle front end outer surface increases hull-skin temperature, helps the oxidation of area carbon, further reduces possibility of jamming.
Preferably, the cylinder cap of described cylinder is provided with mounting hole, and described oil nozzle is positioned at this mounting hole, is provided with seal ring between oil nozzle and the mounting hole.
As improvement of the technical scheme, on one section oil nozzle cylinder in seal ring the place ahead, also be provided with one deck heat insulation layer, can further reduce of the heat transfer of the interior high-temperature fuel gas of cylinder to oil nozzle.
Preferably, described heat insulation layer is made of pottery or big alloy or any other the heat-resisting thermoinsulation material of thermal resistance.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a kind of structural representation at the oil nozzle position of direct spray petrol engine in cylinder of the present invention.
Fig. 2 is the another kind of structural representation at the oil nozzle position of direct spray petrol engine in cylinder of the present invention.
Embodiment
As shown in Figure 1, the cylinder cap 1 of cylinder is provided with mounting hole 4, and oil nozzle 3 is installed in the mounting hole 4, is provided with seal ring 2 between the hole wall of oil nozzle 3 and mounting hole 4.The front end of oil nozzle 3 is provided with one or more spray orifices 5, and inserts in the cylinder.The surface that the front end of oil nozzle 3 contacts with high-temperature fuel gas is provided with one deck heat insulation layer 6, this heat insulation layer 6 can be made of pottery or the big heat-resisting thermoinsulation materials such as alloy of thermal resistance, difference according to heat insulation layer 6 materials, the method that increases heat insulation layer is also different, as can and carrying out diverse ways such as sintering, the surface oxide layer surface of aluminium material (for example to) with plating, spraying plating, welding, coating.
Shown in Figure 2 is a kind of more optimal mode of execution, it not only is provided with heat insulation layer 6 on the front-end face of oil nozzle 3, and on one section oil nozzle cylinder 7 in seal ring 2 the place aheads, also be provided with one deck heat insulation layer, can further reduce of the heat transfer of the interior high-temperature fuel gas of cylinder like this to oil nozzle.
The reason of the present invention from causing oil nozzle to stop up, increased heat insulation layer at oil nozzle front end outer surface, thereby reduced of the heat transfer of burning indoor gas to oil nozzle, the temperature of oil nozzle inner flow passage wall is reduced, avoided gasoline at high temperature physicochemical change to take place and the coking and blocking that causes; Also can improve simultaneously the temperature of oil nozzle front end outer surface, be beneficial to the oxidation of area carbon, so oil nozzle is difficult for stopping up.
Claims (4)
1. a direct spray petrol engine in cylinder comprises that cylinder and front end insert the oil nozzle (3) in the cylinder, and the oil nozzle front end has one or more spray orifices (5), it is characterized in that: the front end that described oil nozzle (3) contacts with high-temperature fuel gas is provided with one deck heat insulation layer (6).
2. direct spray petrol engine in cylinder according to claim 1 is characterized in that: the cylinder cap of described cylinder (1) is provided with mounting hole (4), and described oil nozzle (3) is positioned at this mounting hole (4), is provided with seal ring (2) between oil nozzle (3) and the mounting hole (4).
3. direct spray petrol engine in cylinder according to claim 2 is characterized in that: also be provided with one deck heat insulation layer (6) on one section oil nozzle cylinder (7) in seal ring (2) the place ahead.
4. according to each described direct spray petrol engine in cylinder of claim 1-3, it is characterized in that: described heat insulation layer (6) is made of pottery or big alloy or any other the heat-resisting thermoinsulation material of thermal resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100435041A CN101338717A (en) | 2007-07-05 | 2007-07-05 | In-cylinder direct-injection gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100435041A CN101338717A (en) | 2007-07-05 | 2007-07-05 | In-cylinder direct-injection gasoline engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101338717A true CN101338717A (en) | 2009-01-07 |
Family
ID=40212867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100435041A Pending CN101338717A (en) | 2007-07-05 | 2007-07-05 | In-cylinder direct-injection gasoline engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101338717A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221317A (en) * | 2014-06-26 | 2016-01-06 | 大陆汽车***公司 | Reduce the high pressure gasoline sparger seat of the coating of particulate emission |
| CN107002595A (en) * | 2014-11-28 | 2017-08-01 | 罗伯特·博世有限公司 | The direct injected gas injector cooled down with improvement |
| CN111946512A (en) * | 2020-08-10 | 2020-11-17 | 一汽解放汽车有限公司 | Heat insulation sleeve, heat insulation sleeve manufacturing method and oil spraying mechanism |
-
2007
- 2007-07-05 CN CNA2007100435041A patent/CN101338717A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221317A (en) * | 2014-06-26 | 2016-01-06 | 大陆汽车***公司 | Reduce the high pressure gasoline sparger seat of the coating of particulate emission |
| US9845779B2 (en) | 2014-06-26 | 2017-12-19 | Continental Automotive Systems, Inc. | Coated high pressure gasoline injector seat to reduce particle emissions |
| CN107002595A (en) * | 2014-11-28 | 2017-08-01 | 罗伯特·博世有限公司 | The direct injected gas injector cooled down with improvement |
| CN111946512A (en) * | 2020-08-10 | 2020-11-17 | 一汽解放汽车有限公司 | Heat insulation sleeve, heat insulation sleeve manufacturing method and oil spraying mechanism |
| CN111946512B (en) * | 2020-08-10 | 2021-09-17 | 一汽解放汽车有限公司 | Heat insulation sleeve, heat insulation sleeve manufacturing method and oil spraying mechanism |
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| RJ01 | Rejection of invention patent application after publication |
Open date: 20090107 |