CN204827700U - Engine piston - Google Patents
Engine piston Download PDFInfo
- Publication number
- CN204827700U CN204827700U CN201520620832.3U CN201520620832U CN204827700U CN 204827700 U CN204827700 U CN 204827700U CN 201520620832 U CN201520620832 U CN 201520620832U CN 204827700 U CN204827700 U CN 204827700U
- Authority
- CN
- China
- Prior art keywords
- mountain portion
- joint
- piston
- end surface
- projection mountain
- Prior art date
- 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
Links
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000005474 detonation Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000002000 scavenging effect Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The utility model relates to an engine piston, including the piston only the up end of piston only is provided with central pit, the center pit the edge with be provided with the protruding mountain portion of first protruding mountain portion and second between the edge of up end, the both sides limit of first protruding mountain portion reaches the both sides limit of the protruding mountain portion of second with still be provided with the connecting portion of smooth connection between the up end. The protruding mountain portion of piston crown and the design of connecting portion form the wedge passageway with the valve, do benefit to flame propagation, make flame reach terminal gas mixture rapidly at the ignition initial stage, improve and can avoid the detonation when starting the compression ratio. In the middle of simultaneously protruding mountain position and connecting portion can assemble the cylinder with combustible gas mixture as far as possible.
Description
Technical field
The utility model belongs to technical field of engines, refers to a kind of engine piston especially.
Background technique
Motor produces power, the closed space that combustion chamber of petrol engine is made up of cylinder cap, cylinder holes, piston-top surface and inlet and exhaust valve by mixed gas moment burning expansion, promotion descent of piston in firing chamber.The quality of the chamber structure of petrol engine directly affects the volumetric efficiency of motor, combustion heat release speed, radiation loss, circular wave and detonation etc., thus affects power character, Economy and emission performance.
At present, conventional petrol engine combustion cell structure has basin shape, wedge shape, tent shape etc., and this part depends primarily on cylinder cap position.And piston-top surface is also the important component part forming chamber structure, rational piston-top surface structure can improve power character and the fuel economy of motor.
In order to higher power character can be obtained, usually suitably can improve the compression ratio of motor, but high compression ratio often increases the possibility of engine knock.Simultaneously in order to obtain Economy better, while suitably improving air fuel ratio, the initial stage ignition problem of petrol engine also needs more to be paid close attention to.
Existing common petrol engine combustion cell structure as shown in Figure 1, cylinder cap is provided with intake valve 3, exhaust valve 1 and spark plug 2; Piston 4 is arranged in cylinder 5, and the end face of piston is that plane or centre have unevenness.
The shortcoming of existing technology is, when motor is lighted a fire in the early stage, due to the flat-tope structure of piston, surrounding space is comparatively wide, cause flame can the direction of propagation 6 wide, rate of burning is low, spark plug is to the distance (as shown in Figure 1) of end mixed gas, and detonation possibility is large.
Because the flat head piston bags is comparatively large, the end mixed gas that flame can not arrive easily produces a large amount of CO, is unfavorable for discharge.
Because the flat head piston bags is comparatively large, scavenging 7 scope comparatively large (as illustrated by the arrows in fig. 1), be unfavorable for clearing away waste gas near spark plug, the Ignition Stability when engine start and low speed load is poor.
Model utility content
The purpose of this utility model is to provide a kind of engine piston technological scheme, and the technical program, by the optimization of piston-top surface chamber structure, solves and improves air fuel ratio and compression ratio and the problem of initial stage ignition difficulties that produces for improving engine performance.
The present invention is achieved by the following technical solutions:
A kind of engine piston, includes piston only, the upper-end surface of described piston only is provided with center pit;
The first projection mountain portion and the second projection mountain portion is provided with between the edge and the edge of described upper-end surface of described center pit;
The center line in described first projection mountain portion overlaps with the center line in described second projection mountain portion and is the diameter of described upper-end surface;
The first joint and second joint of smooth connection is also provided with between the dual-side and described upper-end surface in described first projection mountain portion; When extending to described upper-end surface from described first projection mountain portion, the height of described first joint and the height of described second joint reduce all gradually;
The 3rd joint and the 4th joint of smooth connection is also provided with between the dual-side and described upper-end surface in described second projection mountain portion; When extending to described upper-end surface from described second projection mountain portion, the height of described 3rd joint and the height of described 4th joint reduce all gradually.
The described center line in the first projection mountain portion and the middle line parallel of piston pin hole.
Described first joint and described 4th joint smooth connection; Described second joint and described 3rd joint smooth connection.
One end that described first projection mountain portion is close with described center pit, and one end close with described center pit, described second projection mountain portion is inclined-plane, described inclined-plane and the pit smooth connection of described center.
Described upper-end surface and intake valve opposite position are provided with intake valve escape groove.
The quantity of described intake valve escape groove is equal with the quantity of described intake valve.
The beneficial effects of the utility model are:
The pit design of the utility model piston crown center, converge more inflammable mixture, its position is in immediately below spark plug, is beneficial to initial stage igniting.
The projection mountain portion of piston crown and the design of joint, form wedgy passage with valve, be beneficial to flame propagation, makes flame reach rapidly end mixed gas at Initial Stage after Ignition, improves while starting compression ratio and can avoid detonation.Inflammable mixture can converge in the middle of cylinder by position, projection mountain and joint as much as possible simultaneously.
Accompanying drawing explanation
Fig. 1 is existing common combustion chamber of petrol engine structural drawing;
Fig. 2 is the utility model piston front elevation;
Fig. 3 is the utility model piston left view;
Fig. 4 is the utility model piston plan view;
Fig. 5 is firing chamber, the utility model piston place front cross sectional view;
Fig. 6 is the left sectional view in firing chamber, the utility model piston place.
Description of reference numerals
1 exhaust valve, 2 spark plugs, 3 intake valves, 4 pistons, 5 cylinders, 6 flames can the direction of propagation, 7 scavengings, 001 piston only, 002 center pit, 003 first projection mountain portion, 004 upper-end surface, 005 first joint, 006 second joint, 007 second projection mountain portion, 008 the 3rd joint, 009 the 4th joint, 010 intake valve escape groove, 011 cylinder holes, 012 spark plug, 013 intake valve, 014 exhaust valve.
Embodiment
Describe the technical solution of the utility model in detail by the following examples, following embodiment is only exemplary, only can be used for explaining and the technical solution of the utility model being described, and can not be interpreted as being the restriction to technical solutions of the utility model.
The utility model provides a kind of engine piston, as shown in Figures 2 to 6, includes piston only 001, and the upper-end surface 004 of described piston only 001 is provided with center pit 002; In this application, piston only 001 is arranged in cylinder holes 011, and piston only is except the structure of upper-end surface is improved, and remaining part is prior art, not in the protection domain of the application; Namely the application only carries out architecture advances to piston crown.The upper-end surface 004 of piston only 001 is corresponding with intake valve 013, exhaust valve 014 and spark plug 012 respectively.
In this application, the center of center pit 002 and spark plug 012 just right.Piston crown pit designs, and converge more inflammable mixture, its position is in immediately below spark plug, is beneficial to initial stage igniting.
The first projection mountain portion 003 and the second projection mountain portion 007 is provided with between the edge and the edge of described upper-end surface of described center pit; The center line in described first projection mountain portion 003 overlaps with the center line in described second projection mountain portion 007 and is the diameter of described upper-end surface; The first joint 005 and the second joint 006 of smooth connection is also provided with between the dual-side and described upper-end surface 004 in described first projection mountain portion 003; When extending to described upper-end surface from described first projection mountain portion, the height of described first joint and the height of described second joint reduce all gradually; The 3rd joint 008 and the 4th joint 009 of smooth connection is also provided with between the dual-side and described upper-end surface 004 in described second projection mountain portion 007; When extending to described upper-end surface from described second projection mountain portion, the height of described 3rd joint and the height of described 4th joint reduce all gradually.
The projection mountain portion of the upper-end surface of piston only and joint and valve form wedgy passage, are beneficial to flame propagation, make flame reach rapidly end mixed gas at Initial Stage after Ignition, improve while starting compression ratio and can avoid detonation.Inflammable mixture can converge in the middle of cylinder by projection mountain portion as much as possible simultaneously.
The described center line in the first projection mountain portion and the middle line parallel of piston pin hole.
Described first joint 005 and described 4th joint 009 smooth connection; Described second joint 006 and described 3rd joint 008 smooth connection.
One end that described first projection mountain portion is close with described center pit, and one end close with described center pit, described second projection mountain portion is inclined-plane, described inclined-plane and the pit smooth connection of described center.
In described upper-end surface 004, intake valve 013 opposite position is provided with intake valve escape groove 010.The quantity of described intake valve escape groove is equal with the quantity of described intake valve.
In scavenging process, pit position, center is large relative to the flow area in projection mountain portion, and scavenging is herein more thorough, and center pit is in immediately below spark plug, avoids spark plug place to cause because scavenging is not thorough difficulty of catching fire.
The above is only the description of the preferred implementation of model utility; should be understood that; due to the finiteness of literal expression; and objectively there is unlimited concrete structure; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. an engine piston, includes piston only, it is characterized in that: the upper-end surface of described piston only is provided with center pit;
The first projection mountain portion and the second projection mountain portion is provided with between the edge and the edge of described upper-end surface of described center pit;
The center line in described first projection mountain portion overlaps with the center line in described second projection mountain portion and is the diameter of described upper-end surface;
The first joint and second joint of smooth connection is also provided with between the dual-side and described upper-end surface in described first projection mountain portion; When extending to described upper-end surface from described first projection mountain portion, the height of described first joint and the height of described second joint reduce all gradually;
The 3rd joint and the 4th joint of smooth connection is also provided with between the dual-side and described upper-end surface in described second projection mountain portion; When extending to described upper-end surface from described second projection mountain portion, the height of described 3rd joint and the height of described 4th joint reduce all gradually.
2. engine piston according to claim 1, is characterized in that: the described center line in the first projection mountain portion and the middle line parallel of piston pin hole.
3. engine piston according to claim 1, is characterized in that: described first joint and described 4th joint smooth connection; Described second joint and described 3rd joint smooth connection.
4. engine piston according to claim 1, it is characterized in that: one end that described first projection mountain portion is close with described center pit, and one end close with described center pit, described second projection mountain portion is inclined-plane, described inclined-plane and the pit smooth connection of described center.
5. engine piston according to claim 1, is characterized in that: described upper-end surface and intake valve opposite position are provided with intake valve escape groove.
6. engine piston according to claim 5, is characterized in that: the quantity of described intake valve escape groove is equal with the quantity of described intake valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520620832.3U CN204827700U (en) | 2015-08-17 | 2015-08-17 | Engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520620832.3U CN204827700U (en) | 2015-08-17 | 2015-08-17 | Engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204827700U true CN204827700U (en) | 2015-12-02 |
Family
ID=54685309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520620832.3U Expired - Fee Related CN204827700U (en) | 2015-08-17 | 2015-08-17 | Engine piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204827700U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115898623A (en) * | 2022-11-27 | 2023-04-04 | 赛力斯集团股份有限公司 | Combustion system beneficial to improving heat efficiency of engine |
| CN115898622A (en) * | 2022-11-27 | 2023-04-04 | 赛力斯集团股份有限公司 | Combustion chamber beneficial to improving heat efficiency of engine |
-
2015
- 2015-08-17 CN CN201520620832.3U patent/CN204827700U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115898623A (en) * | 2022-11-27 | 2023-04-04 | 赛力斯集团股份有限公司 | Combustion system beneficial to improving heat efficiency of engine |
| CN115898622A (en) * | 2022-11-27 | 2023-04-04 | 赛力斯集团股份有限公司 | Combustion chamber beneficial to improving heat efficiency of engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee before: Anhui Jianghuai Automobile Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20190817 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |