CN203050906U - Cylinder inside direct-injection gasoline-engine piston - Google Patents
Cylinder inside direct-injection gasoline-engine piston Download PDFInfo
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- CN203050906U CN203050906U CN 201320004788 CN201320004788U CN203050906U CN 203050906 U CN203050906 U CN 203050906U CN 201320004788 CN201320004788 CN 201320004788 CN 201320004788 U CN201320004788 U CN 201320004788U CN 203050906 U CN203050906 U CN 203050906U
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- piston
- circular pit
- pit
- plane
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Abstract
The utility model relates to a cylinder inside direct-injection gasoline-engine piston which comprises a piston body. The cylinder inside direct-injection gasoline-engine piston is characterized in that a protrusion is installed in the middle of a top plane of the piston body; a round pit is formed in the middle of and on the lower portion of the top plane of the piston body, the diameter of the opening of the round pit is large, the diameter of the bottom surface of the round pit is small, and a part of the round pit and the protrusion are overlapped; the circle center of the opening of the round pit is located below the circle center of the top plane of the piston body, the circle center of the bottom surface of the round pit is located below the circle center of the opening, and the pit wall of the round pit is an arc-shaped transition surface; and the bottom surface of the round pit is an inclined plane. The cylinder inside direct-injection gasoline-engine piston can prevent oil mist from being partially accumulated inside a top pit of the piston, is beneficial for formation of mixed gas, and further improves combustion efficiency.
Description
Technical field
The utility model relates to gasoline engine part, particularly a kind of direct spray petrol engine in cylinder piston.
Background technique
The firing chamber of internal-combustion engine refers to piston when upper dead center, and fuel is in the space of cylinder interior burning.The firing chamber is made up of piston head, cylinder wall and cylinder head.The top of piston of gasoline engine is generally flat-top, and surface to volume ratio is low, and heat load and the stress that can alleviate the piston group are concentrated.Along with the needs of high efficiency, low oil consumption engine development, the in-cylinder direct injection technology has obtained using widely at present.Direct spray petrol engine in cylinder can reduce the temperature of firing chamber, improves the fuel oil responsiveness, reduces discharging, reduces pinking trend.The needs that direct spray petrol engine in cylinder forms owing to mixed gas, the top structure of piston often are the bowl-shape of projection around the middle pit or partly bowl-shape, and this kind structure cooperates with cylinder wall and cylinder head makes combustion gas form better combustion swirl, to improve combustion efficiency.Pit, bossed structure are on every side arranged in the middle of at present the top of the piston of direct spray petrol engine in cylinder is typically designed to; The pit bottom surface is generally the horizontal plane parallel with the end face of piston.The pit bottom surface is horizontal plane when fuel oil sprays into the firing chamber, and mist of oil can partly be deposited on the pit bottom plane, is unfavorable for the formation of mixed gas, causes combustion efficiency to descend.Therefore, need do further to improve to the top structure of existing direct spray petrol engine in cylinder piston.
Summary of the invention
The purpose of this utility model provides a kind of direct spray petrol engine in cylinder piston, and it can avoid mist of oil partly to be deposited in the top pit of piston, is conducive to the formation of mixed gas, further improves combustion efficiency.
A kind of direct spray petrol engine in cylinder piston described in the utility model comprises piston only, it is characterized in that: a projection is located at the top planes middle part of described piston only; One circular pit is located at top planes middle part and the bottom of described piston only, and diameter little and part in the big bottom surface of the mouth diameters of this circular pit overlaps with described projection; The oral area center of circle of described circular pit is positioned under the center of circle of top planes of described piston only, and the center of circle of the bottom surface of described circular pit is positioned under the oral area center of circle, and the hole wall of described circular pit is the transition arc anchor ring; It is characterized in that: the bottom surface of described circular pit is plane inclined.
Further, dodge the inclined-plane being provided with intake valve near the following left part of described projection, and the right part that this intake valve is dodged the inclined-plane overlaps with described circular pit; Be provided with the intake valve hole near the following right part of described projection, and the left part in this intake valve hole overlaps with described circular pit; It is in order to dodge valve motion, to prevent that the top of intake valve and piston only from bumping against that the intake valve hole is set.
Be provided with exhaust valve at the left part near described protruding top and dodge the inclined-plane, be provided with the exhaust valve hole at the right part near described protruding top; It is in order to dodge valve motion, to prevent that the top of exhaust valve and piston only from bumping against that the exhaust valve hole is set.
Described a kind of direct spray petrol engine in cylinder piston, the angle theta between the bottom surface of its described circular pit and the top planes of piston only are 4 °～8 °.
The utility model compared with prior art has following advantage:
Under the situation of same volume, there is the firing chamber, circular pit bottom surface of constant slope to be more conducive to in-cylinder direct injection system adjusting fuel injection angle degree than planar base surface firing chamber, alleviate the deposition of mist of oil, improve mixed gas formation speed and mixability in the firing chamber, optimize the inflammable mixture eddy flow and form, move towards, be beneficial to the raising combustion efficiency.
Description of drawings
Fig. 1 is top structure schematic representation of the present utility model;
Fig. 2 is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment one: referring to Fig. 1, a kind of direct spray petrol engine in cylinder piston shown in Figure 2, comprise that piston only 20, one projectioies 24 are located at top planes 21 middle parts of described piston only 20; One circular pit 25 is located at top planes 21 middle parts and the bottom of described piston only 20, the big bottom surface of the mouth diameters of this circular pit diameter little and the part overlap with described protruding 24; The oral area center of circle of described circular pit 25 is positioned under the center of circle of top planes 21 of described piston only 20, and the center of circle of the bottom surface 26 of described circular pit 25 is positioned under the oral area center of circle, and the hole wall of described circular pit 25 is transition arc anchor ring 27; It is characterized in that: the bottom surface 26 of described circular pit 25 is plane inclined; Angle theta between the bottom surface 26 of described circular pit and the top planes 21 of piston only is 8 °.
Further, dodge inclined-plane 29 being provided with intake valve near the left part of described protruding 24 bottoms, and the right part that this intake valve is dodged inclined-plane 29 overlaps with described circular pit 25; Be provided with intake valve hole 23 at the right part near described protruding 24 bottoms, and the left part in this intake valve hole 23 overlaps with described circular pit 25; It is in order to dodge valve motion, to prevent that the top of intake valve and piston only from bumping against that the intake valve hole is set; Be provided with exhaust valve at the left part near described protruding 24 tops and dodge inclined-plane 28, be provided with exhaust valve hole 22 at the right part near described protruding 24 tops; It is in order to dodge valve motion, to prevent that the top of exhaust valve and piston only from bumping against that the exhaust valve hole is set.
Embodiment two: the angle theta between the bottom surface 26 of described circular pit and the top planes 21 of piston only is 6 °, and all the other are identical with embodiment one.
Embodiment three: the angle theta between the bottom surface 26 of described circular pit and the top planes 21 of piston only is 4 °, and all the other are identical with embodiment one.
When the bottom surface of circular pit was the plane, along the bottom surface motion, a part also was not able to do in time to mix the top that namely is attached to piston only with fresh air fuel oil, influences combustion efficiency earlier; And because the bottom surface is the plane, stopped the motion of air-flow, be unfavorable for forming eddy current with fresh air, mixed gas can not fully be mixed fast, further reduced combustion efficiency.
When the circular pit bottom surface was the inclined-plane, along the ramped bottom surface motion of circular pit, the fuel oil particle mixed with fresh air before deposition and forms eddy current fuel oil fast and fully, further mixed in the firing chamber, thereby had improved combustion efficiency earlier.
Claims (3)
1. a direct spray petrol engine in cylinder piston comprises piston only (20), it is characterized in that: a projection (24) is located at top planes (21) middle part of described piston only (20); One circular pit (25) is located at top planes (21) middle part and the bottom of described piston only (20), and diameter little and part in the big bottom surface of the mouth diameters of this circular pit overlaps with described projection (24); The oral area center of circle of described circular pit (25) is positioned under the center of circle of top planes (21) of described piston only (20), the center of circle of the bottom surface (26) of described circular pit (25) is positioned under the oral area center of circle, and the hole wall of described circular pit (25) is transition arc anchor ring (27); The bottom surface (26) of described circular pit (25) is plane inclined.
2. a kind of direct spray petrol engine in cylinder piston according to claim 1, it is characterized in that: dodge inclined-plane (29) being provided with intake valve near the following left part of described projection (24), and the right part that this intake valve is dodged inclined-plane (29) overlaps with described circular pit (25); Be provided with intake valve hole (23) near the following right part of described projection (24), and the left part in this intake valve hole (23) overlaps with described circular pit (25); Be provided with exhaust valve at the left part near described projection (24) top and dodge inclined-plane (28), be provided with exhaust valve hole (22) at the right part near described projection (24) top.
3. a kind of direct spray petrol engine in cylinder piston according to claim 1 and 2, it is characterized in that: the angle theta between the bottom surface (26) of described circular pit (25) and the top planes (21) of piston only is 4 °～8 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004788 CN203050906U (en) | 2013-01-06 | 2013-01-06 | Cylinder inside direct-injection gasoline-engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004788 CN203050906U (en) | 2013-01-06 | 2013-01-06 | Cylinder inside direct-injection gasoline-engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203050906U true CN203050906U (en) | 2013-07-10 |
Family
ID=48733865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320004788 Expired - Fee Related CN203050906U (en) | 2013-01-06 | 2013-01-06 | Cylinder inside direct-injection gasoline-engine piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203050906U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103670664A (en) * | 2013-12-05 | 2014-03-26 | 中国第一汽车股份有限公司 | Deep-pit gasoline direct injection engine piston top combustor |
| CN104653326A (en) * | 2014-12-12 | 2015-05-27 | 重庆长安汽车股份有限公司 | Top structure of direct-injection gasoline engine piston |
-
2013
- 2013-01-06 CN CN 201320004788 patent/CN203050906U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103670664A (en) * | 2013-12-05 | 2014-03-26 | 中国第一汽车股份有限公司 | Deep-pit gasoline direct injection engine piston top combustor |
| CN104653326A (en) * | 2014-12-12 | 2015-05-27 | 重庆长安汽车股份有限公司 | Top structure of direct-injection gasoline engine piston |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20210106 |