CN102953860A - Piston combustion chamber structure - Google Patents
Piston combustion chamber structure Download PDFInfo
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- CN102953860A CN102953860A CN201110250463XA CN201110250463A CN102953860A CN 102953860 A CN102953860 A CN 102953860A CN 201110250463X A CN201110250463X A CN 201110250463XA CN 201110250463 A CN201110250463 A CN 201110250463A CN 102953860 A CN102953860 A CN 102953860A
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- chamber structure
- piston combustion
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Abstract
The invention discloses a piston combustion chamber structure for a diesel engine. The piston combustion chamber structure is positioned on the head part of a piston, and comprises a throat opening and a bottom part; the throat opening is of a directly vertical type or an open type corresponding to the bottom part, and a chamfer is formed at the outer edge part of the throat opening; the center of the bottom part is provided with a spherical boss; and the rest part of the bottom part is of a deboss structure of a circular arc profile section. The piston combustion structure provided by the invention is of a simple structure without a combustion chamber necking, can effectively lower pollutant emission, and also can prolong the service life of the piston.
Description
Technical field
The present invention relates to a kind of piston combustion chamber structure, particularly a kind of piston combustion chamber structure for diesel engine.
Background technique
Piston is the core work parts of diesel engine, especially generally is designed with the chamber structure of depression at the head of the piston of medium and heavy diesel engine, and effect is the diesel combustion efficient when improving diesel engine work, makes burning more abundant, has the effect of energy-saving and emission-reduction.Existing chamber structure mostly is circular depressed, and its section is the reducing type that is similar to the ω formula, and namely central authorities have the base frame of projection, and oral area is reducing.By cooperating of this chamber structure and intake swirl and oil sprayer atomization ability, the control of oil spout zero-time, reach Optimizing Combustion, improve the purpose of discharging.The structure of reducing form has certain help to the robust motion of piston, but also exists some problems simultaneously:
At first be that structure small for mouth and large for cavity is unfavorable for air inlet, need the formation by mixed gas in strong intake swirl and the high oil sprayer atomization ability guarantee firing chamber, can cause so the low negative effect of firing chamber charging efficiency, form long delay period, cause nitrogen oxide (NO
X) discharging increase.When the gas discharging standard of current diesel engine improves again and again, tend to occur these those long phenomenons that disappear of nitrogen oxide and hydrocarbon and soot, be not easy to realize reducing simultaneously the discharge amount of these several main pollutant components.It is oxynitrides can be improved in the firing chamber of traditional ω formula reducing type structure when reducing soot and hydrocarbon discharge amount, and the generation of control oxynitrides, palpus control combustion speed can not be too fast, again because each circulation of motor can be certain for period of combustion, control combustion speed then causes again the fuel oil can't after-flame easily, cause that fuel economy reduces, and adds also and will control diesel engine explosion pressure, so the power character of unit of fuel can be affected.So the traditional combustion chamber in order to reach higher emission request level, needs to sacrifice fuel economy and power character, becomes more difficult thereby further reduce discharging by the raising combustion efficiency.In order further to improve the complete machine emission level of diesel engine, just have to improve the performance requirement of the rear gas treatment of discharging.
Next is that the size of piston crown itself is just little, the reducing part of chamber structure can be very not abundant yet, in the process of repeatedly burning, the reducing part not only will stand the acute variation of temperature, that also will bear air whirl with high pressure advances/goes out the mobile impact load of bringing, its mechanical property is easy to descend, and too early structural damage occurs, thereby can have influence on the life-span of piston.
Therefore, a kind of novel piston chamber structure that can overcome defects can appear in hope.
Summary of the invention
The present invention is in order to overcome above-mentioned defective of the prior art, provides a kind of without the simple in structure of firing chamber reducing and can effectively reduce the piston combustion chamber structure of pollutant emission, and this chamber structure can also prolong piston life.
For achieving the above object, provide following technological scheme:
A kind of piston combustion chamber structure is positioned at the head of piston, comprises Hou Kou and bottom, and described Hou Kou is with respect to the upright or uncovered form in bottom; The central authorities of described bottom are provided with a spherical boss, and the remaining part of described bottom is the sunk structure of circular arc section.
Further, place, the outer of described Hou Kou offers chamfering, and the width of described chamfering is 2mm～6mm.
Further, the fillet radius of described spherical boss is 25mm～55mm, and the distance of its distance from top piston-top surface is 5mm～8mm.
Further, the recess of described bottom is 10mm～15mm apart from the distance of piston-top surface.
Further, the section of the attachment portion between the circular arc sunk part of described spherical boss and described bottom is smoothed curve.
Compared with prior art, the present invention has following beneficial effect:
1, through the improved chamber structure no choke of the present invention, and marquis's port part has adopted than the simpler large chamfering of the reducing (structure of width 2mm～6mm), the boss at center, firing chamber is connected with circular arc with the bottom, the formation of mixed gas mainly is by squeezing stream in the bounce-back of oil bundle and the cylinder in the firing chamber in combustion process, do not need very strong intake swirl, guaranteed charging efficiency, that is to say under same emission level and can save oil consumption, be issued to required emission level in same fuel economy condition easilier in other words, and then guaranteed the Economy that fuel oil utilizes;
2, piston is near the top dead center of its motion the time, it is more intense to squeeze the stream effect, air-fuel mixture is effective, sufficient combustion, smoke intensity is little, be conducive to reduce particulate emission, and the present invention can effectively utilize crowded stream in the cylinder, so used suitably retarded injection of piston of the present invention, shortening delay period, thereby can suppress the generation of nitrogen oxide, in addition, commencement of fuel injection can also reduce smoke intensity near postponing till top dead center, thereby the reduction particulate emission is also verified in experimental verification, and chamber structure of the present invention can make the nitrogen oxide of discharging and smoke intensity have basically identical variation tendency, thereby overcoming the intrinsic defective in reducing type firing chamber, is very favorable for satisfied higher emission request;
3, owing to cancelled throat structure, and be provided with large chamfering at the Hou Kou edge, so that temperature intensity and cool condition the highest, that bear the heaviest marquis's port part of air-flow changing load all are improved, the stress distribution situation of marquis's port part is improved, thereby the functional reliability of piston is improved significantly;
4, firing chamber no choke, and its inside is smooth surface, can not block the fluid motion of wall surface within it, without restriction loss, can prevent effectively that fuel oil is detained, the fuel oil utilization ratio in the time of therefore further improving burning;
5, uncovered or straight mouthful design can make the easier turnover of hot flame firing chamber, thereby the temperature in the firing chamber can remain on a high position for more time, be equivalent to reduce relative heat diffusion area, thereby the heat transfer loss is little.
Description of drawings
Fig. 1 is plan view of the present invention;
Fig. 2 is that A-A among Fig. 1 is to sectional structure chart.
Mark the following drawings mark thereon by reference to the accompanying drawings:
The 1-piston body, 2-piston-top surface, 3-Hou Kou, bottom, 4-firing chamber, the spherical boss of 5-, 6-piston crown, the large chamfering of 7-.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subjected to the restriction of embodiment.
A kind of piston combustion chamber structure, as depicted in figs. 1 and 2, be positioned at the piston crown 6 of piston body 1, comprise marquis's mouth 3 and firing chamber bottom 4, described marquis's mouth 3 is with respect to the uncovered form (shown in Figure 1) in firing chamber bottom 4 or upright form (not shown), and the outer of marquis's mouth 3 place offers the large chamfering 7 that width is 2mm～6mm, and its chamfer angle can be any acute angle, generally for one of 30 °, 45 ° or 60 ° selected easy to process.Common chamfering is generally 45 ° of chamferings of 1mm～2mm, but its drainage effect and the effects of improving 3 stressed to marquis's mouth, heat radiation all are not so good as this large chamfering 7.The central authorities of bottom, described firing chamber 4 are provided with a spherical boss 5, and its fillet radius is 25mm～55mm, and the distance of its distance from top piston-top surface 2 is 5mm～8mm.The remaining part of bottom, described firing chamber 4 is the sunk structure of circular arc section, and wherein recess is 10mm～15mm apart from the distance of piston-top surface 2.The section of the attachment portion between the circular arc sunk part of described spherical boss 5 and bottom, described firing chamber 4 is smoothed curve.Chamber structure in this example begins until the top of spherical boss 5 is the smoothed curve transition from the lower limb of large chamfering 7, can make to greatest extent air-flow and fuel oil bundle flowing in the firing chamber not interrupted, without restriction loss, thereby prevents that fuel oil is detained.
Piston body 1 is when work, because marquis's mouth 3 does not have throat structure, so in the combustion process in the firing chamber formation of mixed gas mainly be to flow by squeezing in oil bundle bounce-back and the cylinder, do not need very strong intake swirl that fuel oil and gas in the firing chamber are mixed fully, be conducive to satisfy the demand of burning, improve the Economy that fuel oil utilizes.Because it is more intense that piston near the top dead center of its motion the time, squeezes the stream effect, air-fuel mixture is effective, sufficient combustion, smoke intensity is little, is conducive to reduce particulate emission, and present embodiment can effectively utilize crowded stream in the cylinder, so can suitably postpone to piston body 1 oil spout, shortening delay period, thereby can suppress the generation of nitrogen oxide, also help simultaneously to increase the air pressure in the firing chamber, make burning more abundant, can reduce smoke intensity, thereby reduce particulate emission.
More than disclosed still, the present invention is not limited thereto only for the more excellent specific embodiment of the present invention, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (5)
1. piston combustion chamber structure is positioned at the head of piston, comprises Hou Kou and bottom, it is characterized in that: described Hou Kou is for respect to the upright or uncovered form in bottom; The central authorities of described bottom are provided with a spherical boss, and the remaining part of described bottom is the sunk structure of circular arc section.
2. piston combustion chamber structure according to claim 1 is characterized in that: the place, outer of described Hou Kou offers chamfering, and the width of described chamfering is 2mm～6mm.
3. piston combustion chamber structure according to claim 1, it is characterized in that: the fillet radius of described spherical boss is 25mm～55mm, the distance of its distance from top piston-top surface is 5mm～8mm.
4. piston combustion chamber structure according to claim 1, it is characterized in that: the recess of described bottom is 10mm～15mm apart from the distance of piston-top surface.
5. piston combustion chamber structure according to claim 1, it is characterized in that: the section of the attachment portion between the circular arc sunk part of described spherical boss and described bottom is smoothed curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250463XA CN102953860A (en) | 2011-08-29 | 2011-08-29 | Piston combustion chamber structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110250463XA CN102953860A (en) | 2011-08-29 | 2011-08-29 | Piston combustion chamber structure |
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|---|---|
| CN102953860A true CN102953860A (en) | 2013-03-06 |
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| CN201110250463XA Pending CN102953860A (en) | 2011-08-29 | 2011-08-29 | Piston combustion chamber structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593681A (en) * | 2016-12-20 | 2017-04-26 | 中国第汽车股份有限公司 | Hemispherical combustion chamber for 1L direct-injection gasoline engine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040112323A1 (en) * | 2002-12-13 | 2004-06-17 | Zhengbai Liu | Simplified combustion chamber |
| US20040177828A1 (en) * | 2003-03-13 | 2004-09-16 | Zhengbai Liu | Three-reentrancy combustion chamber |
| US20050115537A1 (en) * | 2003-12-01 | 2005-06-02 | Zhengbai Liu | Combustion chamber |
| US20050172926A1 (en) * | 2004-02-06 | 2005-08-11 | Poola Ramesh B. | Large-bore, medium-speed diesel engine having piston crown bowl with acute re-entrant angle |
| WO2011082788A2 (en) * | 2009-12-17 | 2011-07-14 | Ks Kolbenschmidt Gmbh | Design of combustion chamber bowls in pistons for internal combustion engines |
| CN202202976U (en) * | 2011-08-29 | 2012-04-25 | 广西玉柴机器股份有限公司 | Piston combustion chamber structure |
| CN102859166A (en) * | 2010-04-20 | 2013-01-02 | 卡特彼勒公司 | Piston having combustion bowl shaped to balance combustion efficiency and emission properties |
-
2011
- 2011-08-29 CN CN201110250463XA patent/CN102953860A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040112323A1 (en) * | 2002-12-13 | 2004-06-17 | Zhengbai Liu | Simplified combustion chamber |
| US20040177828A1 (en) * | 2003-03-13 | 2004-09-16 | Zhengbai Liu | Three-reentrancy combustion chamber |
| US20050115537A1 (en) * | 2003-12-01 | 2005-06-02 | Zhengbai Liu | Combustion chamber |
| US20050172926A1 (en) * | 2004-02-06 | 2005-08-11 | Poola Ramesh B. | Large-bore, medium-speed diesel engine having piston crown bowl with acute re-entrant angle |
| WO2011082788A2 (en) * | 2009-12-17 | 2011-07-14 | Ks Kolbenschmidt Gmbh | Design of combustion chamber bowls in pistons for internal combustion engines |
| CN102859166A (en) * | 2010-04-20 | 2013-01-02 | 卡特彼勒公司 | Piston having combustion bowl shaped to balance combustion efficiency and emission properties |
| CN202202976U (en) * | 2011-08-29 | 2012-04-25 | 广西玉柴机器股份有限公司 | Piston combustion chamber structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593681A (en) * | 2016-12-20 | 2017-04-26 | 中国第汽车股份有限公司 | Hemispherical combustion chamber for 1L direct-injection gasoline engine |
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Application publication date: 20130306 |