CN2743562Y - Piston for offset combustion chamber diesel engine cylinder - Google Patents
Piston for offset combustion chamber diesel engine cylinder Download PDFInfo
- Publication number
- CN2743562Y CN2743562Y CN 200420017167 CN200420017167U CN2743562Y CN 2743562 Y CN2743562 Y CN 2743562Y CN 200420017167 CN200420017167 CN 200420017167 CN 200420017167 U CN200420017167 U CN 200420017167U CN 2743562 Y CN2743562 Y CN 2743562Y
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- CN
- China
- Prior art keywords
- piston
- ellipse
- engine
- diesel engine
- asymmetric
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title abstract description 4
- 238000010304 firing Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 abstract description 4
- 239000010687 lubricating oil Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model relates to a piston for biasing combustion chamber diesel engine cylinder, its characterized in that: the piston head is in an asymmetric cone-ellipse structure, namely, the compensation quantity on the side with large expansion quantity is large, and the compensation quantity on the side with small expansion quantity is small. When the piston works, the clearance is uniform, the engine sealing is effectively improved, and the particle emission of the engine is favorably improved; and can further reduce the consumption of lubricating oil of the engine, and provide possibility for the emission level of the engine to reach the Euro 2 or Euro 3 standard. The piston head is in an asymmetric cone-ellipse structure, namely the cross section of the piston head is in an ellipse, and two major semi-axes of the ellipse are asymmetric.
Description
Technical field: the utility model relates to a kind of piston that is used for diesel engine cylinder, and the firing chamber of especially setovering is the piston of biasing firing chamber diesel engine cylinder.
Technical background: on the diesel engine of two traditional valves, biasing oil sprayer and firing chamber, present known piston crown molded lines design is " boring an ellipse " structure of symmetry, it can satisfy the compensation of chamber temperature field to the piston crown axial thermal expansion, but can not satisfy the needs of when biasing temperature field, firing chamber to the compensation of piston crown radial thermal expansion.Because compensate for clearance symmetrically and evenly, during engine operation, guarantee the reliable operation of the excessive side of thermal expansion amount, its gap must be enough big, and the little side real work gap of swell increment is just bigger, thereby will influence the motor sealing, lubricating oil consumption is increased, finally influence the motor particulate emission.
Summary of the invention: the utility model is in order to eliminate the biasing of bowl in piston pit, the edge of combustion chamber wall unevenness brings the thermal expansion amount compensation rate problem that causes not of uniform size that causes not of uniform size, a kind of piston of the firing chamber diesel engine cylinder that is used to setover is provided, it is characterized in that: described piston crown is asymmetric " awl-ellipse " structure, be that piston head bank section shape is ellipse, two major semi axis of described ellipse are asymmetric.
On the diesel engine of two traditional valves, biasing oil sprayer and firing chamber, adopt this piston, the side compensation rate that swell increment is big is also big, and the little side compensation rate of swell increment is also smaller, when making pistons work, the gap uniformity has improved the motor sealing effectively, helps improving the motor particulate emission; And can further reduce the engine lubrication oil consumption, for the engine emission level reaches Europe 2 or Europe 3 standards, providing may.
Description of drawings: Fig. 1 is the user mode longitudinal section subssembly drawing of piston of the present utility model;
Fig. 2 is the projection of piston head of the present utility model;
Fig. 3 is a piston face molded lines of the present utility model;
Fig. 4 is a piston head bank section shape of the present utility model.
Embodiment: as shown in Figure 1 and Figure 2, the piston 1 of this firing chamber diesel engine cylinder that is used to setover is assemblied on the engine cylinder 2 and cooperates with cylinder liner 4; The head of piston 1 has piston ring group 3, structure that head is asymmetric " awl-ellipse ", and two major semi axis of described ellipse are asymmetric.If when the piston combustion bowl center was e to the offset at piston center, the swell increment in piston 1 left side was greater than the swell increment on right side, so the compensation rate Δ in piston 1 left side
1Compensation rate Δ with the right side
2, on the longitudinal section, show as Δ
1＞Δ
2, promptly piston head An Chu gap is asymmetric during normal temperature.As shown in Figure 3, difference H is ovality between the pin-and-hole direction molded lines 6 of piston 1 and the skirt section direction molded lines 7.As shown in Figure 4, the projection of square real profile on the bank of piston 1 head top, i.e. piston head bank section shape, wherein the difference of major diameter D and minor axis diameter d is ovality H, and the major semi axis of asymmetric ellipse is respectively A, B, and major semi axis B is greater than major semi axis A.
Embodiment: when the engine air cylinder diameter is not more than 105mm, firing chamber side-play amount e is about 5.8mm, diameter is when 56mm, and piston 1 is at the two-semiaxle compensation rate Δ of major axis
1＞Δ
2, and 0.1mm 〉=Δ
1-Δ
2〉=0.05mm, promptly the difference between two major semi axis is in the scope of 0.05～0.1mm.Between difference in the scope of 0.05～0.1mm.
This piston calculates piston crown characteristic point, thermal expansion amount, as Δ according to concrete engine piston temperature measurement result
1, Δ
2, Δ
3Deng, on the basis of reserving certain safety coefficient, determine awl one oval design parameter, by means of CNC processing technology, when outside piston fine finishing, realize asymmetric molded lines processing.
This design method is not only applicable to the design of piston crown, goes for the design of whole piston face molded lines yet.
On the diesel engine of two traditional valves, biasing oil sprayer and firing chamber, adopt the piston of this structure, the side compensation rate that swell increment is big is also big, and the little side compensation rate of swell increment is also smaller, when making pistons work, the gap uniformity can improve the motor sealing effectively, helps improving the motor particulate emission; And can further reduce the engine lubrication oil consumption, for the engine emission level reaches Europe 2 or Europe 3 standards provide possibility.
Claims (2)
1, a kind of piston of the firing chamber diesel engine cylinder that is used to setover, it is characterized in that: described piston crown is asymmetric " boring an ellipse " structure, and promptly piston head bank section shape is oval, and two major semi axis of described ellipse are asymmetric.
2, the piston of the firing chamber diesel engine cylinder that is used to setover as claimed in claim 1, it is characterized in that: the difference between described two major semi axis is in the scope of 0.05～0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017167 CN2743562Y (en) | 2004-02-15 | 2004-02-15 | Piston for offset combustion chamber diesel engine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017167 CN2743562Y (en) | 2004-02-15 | 2004-02-15 | Piston for offset combustion chamber diesel engine cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2743562Y true CN2743562Y (en) | 2005-11-30 |
Family
ID=35633581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420017167 Expired - Lifetime CN2743562Y (en) | 2004-02-15 | 2004-02-15 | Piston for offset combustion chamber diesel engine cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2743562Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595053A (en) * | 2013-10-31 | 2015-05-06 | 北汽福田汽车股份有限公司 | Engine and vehicle having engine |
-
2004
- 2004-02-15 CN CN 200420017167 patent/CN2743562Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595053A (en) * | 2013-10-31 | 2015-05-06 | 北汽福田汽车股份有限公司 | Engine and vehicle having engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: DONGFENG COMMERCIAL VEHICLE CO., LTD. Free format text: FORMER OWNER: DONGFENG AUTOMOBILE CO., LTD. Effective date: 20130912 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130912 Address after: 442001 Shiyan City, Hubei province city Zhangwan District Road No. 2 Patentee after: DONGFENG TRUCKS Co.,Ltd. Address before: Shiyan City, Hubei province 442001 City Road No. 1 Patentee before: DONGFENG MOTER Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140215 Granted publication date: 20051130 |