CN103362682A - Diesel engine piston - Google Patents
Diesel engine piston Download PDFInfo
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- CN103362682A CN103362682A CN2013103398092A CN201310339809A CN103362682A CN 103362682 A CN103362682 A CN 103362682A CN 2013103398092 A CN2013103398092 A CN 2013103398092A CN 201310339809 A CN201310339809 A CN 201310339809A CN 103362682 A CN103362682 A CN 103362682A
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Abstract
The invention relates to a diesel engine piston. A similar-to-omega-shaped combustion chamber with a necking is arranged at the top of the piston. An inner cold oil cavity is arranged on the top portion of the piston. Forced cooling is carried out mainly by injecting bundle-shaped oil liquid ceaselessly to a piston inner cavity through a piston cooling nozzle. Two gas annular grooves and an oil annular groove are formed in an annular groove part of the piston. According to the technical scheme, design intensity is high and weight is light, heat conductivity, abrasion resistance and cylinder inner guiding performance are good, and meanwhile noise during operation of a machine is low, emission meets a compulsory standard, cooling effect is good, emission of oxynitride is lowered, and meanwhile power load of an engine is improved.
Description
Technical field
Patent of the present invention relates to technical field of internal combustion engines, relates to specifically a kind of piston that reaches the emission standard diesel engine.
Background technique
In recent years, along with development and the progress of human society, environmental problem causes people's concern increasingly, countries in the world are sound and perfect gradually relevant Abgasgesetz.Along with domestic and international emission standard is more and more stricter, the emission request that the diesel engine product must reach standard could obtain the type approval of relevant departments and obtain production permit, thereby, make the diesel engine product possess certain market competitiveness and market prospects, be badly in need of developing a kind of low emission, oligosaprobic Novel diesel engine.In the factors that affects the diesel emission performance, main movement spare piston is one of influence factor of outbalance.
Because diesel engine is having relevant NBS aspect noise and the discharging, therefore to improve power, fuel economy and the durability of diesel engine, also will carry out cost control simultaneously, this just requires the design to diesel engine, and especially the design of piston is more and more stricter.
Simultaneously, diesel engine requires again low emission, long lifetime, fuel economy and low cost towards the trend development of high-power requirement, and under this environment, miniaturization and the light-weight design of diesel engine are arisen at the historic moment.Can say, Miniaturization Design is with to reduce weight more and more important in the status in the modern diesel engine design.For the motor overall dimensions is reduced, each element size is corresponding to be reduced in inevitable will making; In order to improve the rotating speed of motor, reduce vibration and noise, inevitable requirement motion assembly quality reduces, to reduce consequent inertial force.
Summary of the invention
The objective of the invention is the available engine piston is improved, can meet emission standard, improve simultaneously the living load of motor in the discharging that reduces nitrogen oxide.
The present invention is achieved by the following technical solutions:
A kind of diesel motor piston, the top of piston have the similar ω shape firing chamber of reducing, and the top of piston also is provided with inner-cooling oil recess, mainly are continuously to spray pencil fluid by piston cooling nozzle to piston cavity to force cooling; The piston ring slot part is provided with the twice compression with oil ring groove; Described firing chamber is symplex structure with the center line of the shaft section of piston, at the center of firing chamber one frustum cone structure is arranged, the upper surface of round platform is the plane, the side surface of round platform is the curve with certain radian, the other end of curve is connected with 1/4 circular arc, the other end of circular arc connects the first cylindrical side by one section camber line different from circular arc curvature, the other end of cylindrical side connects the second cylindrical side by camber line, the second cylindrical side is connected with the upper surface of piston, and described each surperficial connection is smooth connection.
The diameter of described the second cylinder is greater than the diameter of the first cylinder; Curvature of curve between the second cylinder and the first cylinder is less than the curvature of a curve between the second cylinder and the circular arc, but greater than the curvature of the round platform side surface between circular arc and the round platform upper surface.
The ratio of the diameter of the diameter of the first cylinder and the second cylinder is between the 0.882-0.902.
The diameter ratio of described radius of arc and the second cylinder is between the 0.175-0.192.
The ratio of described round platform upper surface diameter and the second body diameter is between the 0.093-0.113.
Also be provided with piston pin hole on piston, piston pin hole adopts the profiled holes structure, and piston pin hole is divided into the A that is positioned at the middle part and B and C three parts of A both sides in the degree of depth, and the diameter of this three part is the diameter of diameter 〉=A of diameter 〉=B of C.
The inner-cooling oil reservoir structure of piston is that oilhole is parallel with the center line of piston.
Useful technique effect of the present invention is:
1, improves simultaneously the living load of motor in the discharging that reduces nitrogen oxide.
2, design strength is high, and quality is light, and guidance quality is good in thermal conductivity, wear resistance and the cylinder, and noise is little in the time of can also guaranteeing machine run simultaneously, and discharging reaches mandatory standard, good cooling results.
Description of drawings
Fig. 1 is longitudinal section of the present invention.
Fig. 2 is wrist pin structural representation of the present invention.
Embodiment
Describe by the following examples technological scheme of the present invention in detail, should be understood that, following embodiment only is exemplary, only can be used for explaining and technological scheme of the present invention being described, and can not to be interpreted as is restriction to technical solution of the present invention.
In the present embodiment, be elaborated as an example of diesel oil 2.7L motor example, in the application's technological scheme, still be suitable for the motor of other model, but concrete size can be different from the 2.7L motor, concrete size is as long as just can access by experiment.
As depicted in figs. 1 and 2, a kind of diesel motor piston, the top of piston 1 has the similar ω shape firing chamber 2 of reducing, and the top of piston 1 also is provided with inner-cooling oil recess 3, and inner-cooling oil recess 3 structures of piston 1 are that oilhole is parallel with the center line of piston; Mainly be continuously to spray pencil fluid by piston cooling nozzle to piston cavity to force cooling.
Piston 1 annular groove section is provided with the twice compression with oil ring groove, is respectively annular groove guard ring 4, top compression ring groove 5, second gas ring groove 6, oil ring groove 7.The top compression ring groove 5 interior edges of diesel motor piston are provided with annular groove guard ring 4, annular groove guard ring 4 materials are high-nickel austenitic cast iron, annular groove guard ring 4 is provided with top compression ring groove 5, the cross section of top compression ring groove 5 is trapezoidal, and top compression ring groove 5 highly is 2.097(+0.08 ,+0.10) and mm, second gas ring groove 6 highly is 2(+0.04, + 0.06) mm, oil ring groove 7 highly are 3(+0.02 ,+0.04) and mm.
Firing chamber 2 is symplex structure with the center line of the shaft section of piston, one round platform, 10 structures are arranged at the center of firing chamber, the upper surface of round platform 10 is the plane, the side surface 9 of round platform is for having the curve of certain radian, the other end of curve is connected with 1/4 circular arc 12, the other end of circular arc 12 connects the first cylinder 11 sides by one section camber line different from circular arc curvature, the other end of the first cylinder 11 sides connects the second cylinder 8 sides by camber line, the second cylinder 8 sides are connected with the upper surface of piston 1, and described each surperficial connection is smooth connection.
The diameter of described the second cylinder 8 is greater than the diameter of the first cylinder 11; Curvature of curve between the second cylinder and the first cylinder is less than the curvature of a curve between the second cylinder and the circular arc, but greater than the curvature of the round platform side surface between circular arc and the round platform upper surface.
The ratio of the diameter of the diameter of the first cylinder and the second cylinder is between the 0.882-0.902.
The diameter ratio of described radius of arc and the second cylinder is between the 0.175-0.192.
The ratio of described round platform upper surface diameter and the second body diameter is between the 0.093-0.113.
Concrete situation is, is 16.5 ± 0.05mm from the upper surface of the piston degree of depth at the bottom of the firing chamber, and the first body diameter is φ 58 ± 0.1mm, combustion chamber volume 33.58 ± 0.3ml.
Also be provided with piston pin hole on piston 1, piston pin hole adopts the profiled holes structure, and piston pin hole is divided into the A15 that is positioned at the middle part and B14 and C16 three parts of A both sides in the degree of depth, and the diameter of this three part is the diameter of diameter 〉=A of diameter 〉=B of C.
The piston pin hole diameter dimension is:
A=Φ 34.5(+0.006 ,+0.011) mm, B=(A+0.015) mm ± 0.003mm, C=(A+0.018) mm ± 0.003mm, the distortion of wrist pin in movement process better catered in this design, is conducive to reduce stress and concentrates.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiments, scope of the present invention is by claims and be equal to and limit.
Claims (7)
1. diesel motor piston, it is characterized in that: the top of piston has the similar ω shape firing chamber of reducing, the top of piston also is provided with inner-cooling oil recess, mainly is continuously to spray pencil fluid by piston cooling nozzle to piston cavity to force cooling; The piston ring slot part is provided with the twice compression with oil ring groove; Described firing chamber is symplex structure with the center line of the shaft section of piston, at the center of firing chamber one frustum cone structure is arranged, the upper surface of round platform is the plane, the side surface of round platform is the curve with certain radian, the other end of curve is connected with 1/4 circular arc, the other end of circular arc connects the first cylindrical side by one section camber line different from circular arc curvature, the other end of cylindrical side connects the second cylindrical side by camber line, the second cylindrical side is connected with the upper surface of piston, and described each surperficial connection is smooth connection.
2. diesel motor piston according to claim 1, it is characterized in that: the diameter of described the second cylinder is greater than the diameter of the first cylinder; Curvature of curve between the second cylinder and the first cylinder is less than the curvature of a curve between the second cylinder and the circular arc, but greater than the curvature of the round platform side surface between circular arc and the round platform upper surface.
3. diesel motor piston according to claim 1 and 2, it is characterized in that: the ratio of the diameter of the diameter of the first cylinder and the second cylinder is between the 0.882-0.902.
4. diesel motor piston according to claim 1 and 2 is characterized in that: the diameter of described radius of arc and the second cylinder is than between the 0.175-0.192.
5. diesel motor piston according to claim 1 and 2, it is characterized in that: the ratio of described round platform upper surface diameter and the second body diameter is between the 0.093-0.113.
6. diesel motor piston according to claim 1, it is characterized in that: on piston, also be provided with piston pin hole, piston pin hole adopts the profiled holes structure, piston pin hole the degree of depth be divided into be positioned at the middle part A and B and C three parts of A both sides, the diameter of this three part is the diameter of diameter 〉=A of diameter 〉=B of C.
7. diesel motor piston according to claim 1, it is characterized in that: the inner-cooling oil reservoir structure of piston is that oilhole is parallel with the center line of piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310339809.2A CN103362682B (en) | 2013-08-06 | 2013-08-06 | A kind of diesel motor piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310339809.2A CN103362682B (en) | 2013-08-06 | 2013-08-06 | A kind of diesel motor piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103362682A true CN103362682A (en) | 2013-10-23 |
| CN103362682B CN103362682B (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310339809.2A Active CN103362682B (en) | 2013-08-06 | 2013-08-06 | A kind of diesel motor piston |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832315A (en) * | 2014-07-21 | 2015-08-12 | 北汽福田汽车股份有限公司 | Engine piston and engine comprising same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK48485A (en) * | 1984-02-02 | 1985-08-03 | Kolbenschmidt Ag | COMPOSITE, LIQUID STAMP FOR COMBUSTION ENGINES |
| WO1988009433A1 (en) * | 1987-05-26 | 1988-12-01 | Mahle Gmbh | Coolable plunger piston for internal combustion engines |
| DE4010062A1 (en) * | 1990-03-29 | 1991-10-02 | Mahle Gmbh | Oil cooling of piston - is for IC engine and involves annular groove in piston crown |
| CN102444496A (en) * | 2011-12-09 | 2012-05-09 | 石家庄金刚内燃机零部件集团有限公司 | Pressurizing oil-saving type piston of diesel engine |
| CN202250444U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Piston of internal combustion engine |
-
2013
- 2013-08-06 CN CN201310339809.2A patent/CN103362682B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK48485A (en) * | 1984-02-02 | 1985-08-03 | Kolbenschmidt Ag | COMPOSITE, LIQUID STAMP FOR COMBUSTION ENGINES |
| EP0150542A2 (en) * | 1984-02-02 | 1985-08-07 | KOLBENSCHMIDT Aktiengesellschaft | Assembled liquid-cooled piston for internal combustion engines |
| WO1988009433A1 (en) * | 1987-05-26 | 1988-12-01 | Mahle Gmbh | Coolable plunger piston for internal combustion engines |
| DE4010062A1 (en) * | 1990-03-29 | 1991-10-02 | Mahle Gmbh | Oil cooling of piston - is for IC engine and involves annular groove in piston crown |
| CN202250444U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Piston of internal combustion engine |
| CN102444496A (en) * | 2011-12-09 | 2012-05-09 | 石家庄金刚内燃机零部件集团有限公司 | Pressurizing oil-saving type piston of diesel engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832315A (en) * | 2014-07-21 | 2015-08-12 | 北汽福田汽车股份有限公司 | Engine piston and engine comprising same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103362682B (en) | 2015-08-26 |
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Address after: Hefei City, Anhui Province, 230022 East Road No. 176 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: Hefei City, Anhui Province, 230022 East Road No. 176 Patentee before: Anhui Jianghuai Automobile Co., Ltd. |
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Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230022 No. 176 Dongliu Road, Hefei City, Anhui Province Patentee before: Anhui Jianghuai Automobile Group Limited by Share Ltd |