CN204493000U - The piston of equipped with combustion chamber in duel fuel engine - Google Patents
The piston of equipped with combustion chamber in duel fuel engine Download PDFInfo
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- CN204493000U CN204493000U CN201520193517.7U CN201520193517U CN204493000U CN 204493000 U CN204493000 U CN 204493000U CN 201520193517 U CN201520193517 U CN 201520193517U CN 204493000 U CN204493000 U CN 204493000U
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Abstract
The utility model discloses the piston of equipped with combustion chamber in duel fuel engine, i.e. blast chamber type piston (1), under being intended to overcome Natural Gas & Diesel Dual Fuel Engine small engine load, HC discharge is too high, the incomplete shortcoming of combustion of natural gas.The top of blast chamber type piston (1) arranges eight lobe dumbbell-like shape firing chambers, the axis of symmetry conllinear of eight lobe dumbbell-like shape firing chambers and blast chamber type piston (1); Eight lobe dumbbell-like shape firing chambers are formed by connecting by the octofoil figure cylinder hole (2) on top, the dumbbell-like shape turned cavities (3) of bottom and transition circle ring surface (4).Octofoil figure cylinder hole (2) by eight sections inwardly protruded wait the inner cylindrical surface of radiuses and eight sections of outwardly convexs etc. the external cylindrical surface of radius form, eight sections of inner cylindrical surfaces and eight sections of alternate layouts of external cylindrical surface, dumbbell-like shape turned cavities (3) is made up of outer toroid arc surface, boss round table surface and end annulus arc surface, and boss round table surface is arranged in the center of eight lobe dumbbell-like shape firing chambers dumbbell-like shape turned cavities (3).
Description
Technical field
The utility model relates to a kind of for the piston in motor, and more particularly, the utility model relates to a kind of piston for equipped with combustion chamber in Natural Gas & Diesel Dual Fuel Engine motor.
Background technique
The day by day deficient and environmental pollution of petroleum resources be day by day seriously the principal element restricting China Automobile Industry.Under this trend, rock gas is widely applied with its aboundresources and discharge close friend.According to the behaviour in service of current natural gas engine, be mainly divided into natural gas igniting formula and compression-ignited two classes of Natural Gas & Diesel Dual Fuel Engine.Although Natural Gas & Diesel Dual Fuel Engine motor is not also used widely at present, energy-conservation with environmental protection in all embodied advantage, there is good development prospect.It is compared with traditional diesel engine, and CNG/Diesel motor can reduce NO and carbon smoke exhaust simultaneously, and use rock gas can also reduce the dependence to oil; Compared with natural gas igniting formula motor, the more burning things which may cause a fire disaster of diesel pilot accelerates propagation of flame speed, adopts larger compression ratio, improves the thermal efficiency.
But Natural Gas & Diesel Dual Fuel Engine motor inevitably exists some problems, wherein comparatively distinct issues are that HC discharge is too high under Smaller load, and combustion of natural gas is incomplete, and especially under high substitution rate, problem is more serious.In order to address this problem, the combustion process of Natural Gas & Diesel Dual Fuel Engine motor can be improved by the shape of optimal design firing chamber.Be not the custom-designed firing chamber of Natural Gas & Diesel Dual Fuel Engine motor specially both at home and abroad at present, modal for continuing to use the reducing ω shape firing chamber being applicable to diesel engine.And the existing diffusive combustion of Natural Gas & Diesel Dual Fuel Engine motor has premixed combustion, have Spark ignition type and compression ignition engine two aspect feature concurrently, be applicable to merely petrol engine, optimal selection that the firing chamber of diesel engine is not obviously duel fuel engine, thus need to redesign firing chamber.
Summary of the invention
Technical problem to be solved in the utility model is that under overcoming Natural Gas & Diesel Dual Fuel Engine small engine load, HC discharge is too high, the incomplete shortcoming of combustion of natural gas, provides a kind of piston for equipped with combustion chamber in Natural Gas & Diesel Dual Fuel Engine motor.
For solving the problems of the technologies described above, the utility model adopts following technological scheme to realize: in described duel fuel engine, the piston of equipped with combustion chamber and the center of blast chamber type piston tip arrange eight lobe dumbbell-like shape firing chambers, the axis of symmetry of eight lobe dumbbell-like shape firing chambers and the axis of symmetry conllinear of blast chamber type piston.
Eight described lobe dumbbell-like shape firing chambers are formed by connecting by the octofoil figure cylinder hole on top, the dumbbell-like shape turned cavities of bottom and the excessive circle ring surface that adopts between the two.
Octofoil figure cylinder hole described in technological scheme by eight sections inwardly protruded wait the inner cylindrical surface of radiuses and eight sections of outwardly convexs etc. the external cylindrical surface of radius form, eight sections of inner cylindrical surfaces and eight sections of alternate layouts of external cylindrical surface, the gyration center line of the gyration center line of eight sections of inner cylindrical surfaces and eight sections of external cylindrical surfaces is parallel to each other, the gyration center line of eight sections of inner cylindrical surfaces is with the gyration center line parallel of blast chamber type piston and apart from equal, the gyration center line of eight sections of external cylindrical surfaces is with the gyration center line parallel of blast chamber type piston and apart from equal, adjacent inner cylindrical surface is connected with external cylindrical surface is round and smooth.
Described in technological scheme an eight section inner cylindrical surface diameter is 57 ~ 59mm, and the diameter of eight sections of external cylindrical surfaces is 17 ~ 19mm, and the gyration center line minimum distance of eight sections of external cylindrical surface distance blast chamber type pistons is 25 ~ 27mm, and the height in octofoil figure cylinder hole is 3 ~ 4mm.
Dumbbell-like shape turned cavities described in technological scheme is made up of outer toroid arc surface, boss round table surface and end annulus arc surface; Wherein: boss and boss round table surface are arranged in the center of eight lobe dumbbell-like shape firing chamber dumbbell-like shape turned cavities, the rotational axis of dumbbell-like shape turned cavities and the rotational axis conllinear of blast chamber type piston in the rotational axis of boss round table surface, eight lobe dumbbell-like shape firing chambers.The top of outer toroid arc surface adopts excessive circle ring surface to be connected with the bottom in the octofoil figure cylinder hole on top is round and smooth, the bottom of outer toroid arc surface is connected with one end of end annulus arc surface is round and smooth, the other end of end annulus arc surface is connected with the bottom of boss round table surface, exactly, adopt small circle ring arc surface by the round and smooth connection of end annulus arc surface and boss round table surface bottom between the other end of end annulus arc surface and boss round table surface bottom.
The radius of the outer toroid arc surface of the dumbbell-like shape turned cavities described in technological scheme is 10 ~ 11mm, the bottom diameter of boss round table surface is 48 ~ 50mm, the top end diameter of boss round table surface is 10 ~ 12mm, the top end of boss round table surface is 3 ~ 4mm apart from eight lobe dumbbell-like shape top of combustion chamber distances, the radius of end annulus arc surface is 50 ~ 52mm, and the radius of small circle ring arc surface is 5 ~ 6mm.
The subsequent corrosion that namely excessive circle ring surface described in technological scheme connects the excessive circle ring surface of the outer toroid arc surface in the octofoil figure cylinder hole on top and the dumbbell-like shape turned cavities of bottom is 5 ~ 6mm.
Compared with prior art the beneficial effects of the utility model are:
1. in duel fuel engine described in the utility model, the piston of equipped with combustion chamber can change the fire location of diesel pilot, thus diesel-fuel ignition point is distributed rationally.
2. eight lobe dumbbell-like shape firing chambers described in the utility model are in the flame propagation stage, flow due to stronger inverse squeezing can be produced on the one hand, top octofoil figure, bottom dumbbell-shaped section change the stronger eddy current caused on the other hand, both cause tubulence energy to have a very wide distribution at acting in conjunction, and keep higher level for a long time, thus make Flame of Natural Gas bamboo telegraph.
3. when in duel fuel engine described in the utility model, numerical simulation is carried out in eight lobe dumbbell-like shape firing chambers of the piston of equipped with combustion chamber under 1335r/min, homenergic 25% load (identical with the energy that former diesel engine 25% load discharges) and 90% substitution rate (rock gas accounts for 90% of gross mass) operating mode, in-cylinder pressure peakedness ratio former machine reducing ω shape firing chamber in-cylinder pressure peak value is high by about 13%, power character improves about 38%, and this illustrates that eight lobe dumbbell-like shape firing chambers are conducive to the burning of Natural Gas & Diesel Dual Fuel Engine motor as the rock gas of main fuel.
4. when in duel fuel engine described in the utility model, numerical simulation is carried out in eight lobe dumbbell-like shape firing chambers of the piston of equipped with combustion chamber under 1335r/min, homenergic 25% load and 90% substitution rate operating mode, second rate of heat release peakedness ratio first rate of heat release peak value is taller, rock gas perfect combustion can be impelled compared to former machine in eight lobe dumbbell-like shape firing chambers, give full play to the effect of rock gas main fuel, improve Economy.
5. when in duel fuel engine described in the utility model, numerical simulation is carried out in eight lobe dumbbell-like shape firing chambers of the piston of equipped with combustion chamber under 1335r/min, homenergic 25% load and 90% substitution rate operating mode, former machine rock gas residual capacity is close to 30%, and by eight lobe dumbbell-like shape firing chamber rock gas residual capacityes less than 1%, greatly reduce the HC discharge caused because rock gas is imperfect combustion.
6. when in duel fuel engine described in the utility model, numerical simulation is carried out in eight lobe dumbbell-like shape firing chambers of the piston of equipped with combustion chamber under 1335r/min, homenergic 25% load and 90% substitution rate operating mode, soot reduces ten times compared to former machine, and NO only improves 1.5 times.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described:
The plan view of the former machine reducing ω shape firing chamber of Fig. 1 set by the center, top of the piston of equipped with combustion chamber in prior art;
The former machine reducing ω shape firing chamber of Fig. 2 set by the center, top of the piston of equipped with combustion chamber in prior art plan view;
The axonometric projection graph of the eight lobe dumbbell-like shape chamber structure compositions of Fig. 3 set by the center, top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model;
The plan view of the eight lobe dumbbell-like shape firing chambers of Fig. 4 set by the center, top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model;
The plan view of the eight lobe dumbbell-like shape firing chambers of Fig. 5 set by the center, top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model;
In the cylinder of the eight lobe dumbbell-like shape firing chambers of Fig. 6 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape firing chamber, middle pressure is with the change curve of crank angle;
In the cylinder of the eight lobe dumbbell-like shape firing chambers of Fig. 7 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape firing chamber, mean temperature is with the change curve of crank angle;
The eight lobe dumbbell-like shape firing chambers of Fig. 8 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape firing chamber rate of heat release are with the change curve of crank angle;
The eight lobe dumbbell-like shape firing chambers of Fig. 9 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape chamber fuel remain the change curve of percentage with crank angle;
The eight lobe dumbbell-like shape firing chambers of Figure 10 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape firing chamber NO growing amount schematic diagram;
The eight lobe dumbbell-like shape firing chambers of Figure 11 set by the top of the piston of equipped with combustion chamber in duel fuel engine described in the utility model and former machine reducing ω shape firing chamber Soot Formation amount schematic diagram;
Wherein: 1. blast chamber type piston, 2. octofoil figure cylinder hole, 3. dumbbell-like shape turned cavities, 4. excessive circle ring surface.
Embodiment
Below in conjunction with accompanying drawing, the utility model is explained in detail:
Consult Fig. 1 to Fig. 2, reducing ω shape firing chamber set by the top of the piston of the equipped with combustion chamber extensively adopted for current duel fuel engine in figure, this top, firing chamber is convergent cylindrical body, and bottom is ω shape turned cavities, adopts circle ring surface excessive between the two.
Consult Fig. 3, in duel fuel engine described in the utility model, the piston of equipped with combustion chamber and blast chamber type piston 1 are substantially identical with the piston structure shape and size that prior art adopts, difference is that piston crown that prior art adopts processes a reducing ω shape firing chamber, and the piston of equipped with combustion chamber and the center on blast chamber type piston 1 top arrange eight lobe dumbbell-like shape firing chambers in duel fuel engine described in the utility model, the axis of symmetry of eight lobe dumbbell-like shape firing chambers and the axis of symmetry conllinear of blast chamber type piston 1.
Consult Fig. 3 and Fig. 4, eight lobe dumbbell-like shape firing chambers in duel fuel engine described in the utility model on the piston of equipped with combustion chamber and blast chamber type piston 1 are formed by connecting by the octofoil figure cylinder hole 2 on top, the dumbbell-like shape turned cavities 3 of bottom and the excessive circle ring surface 4 that adopts between the two.
Consult Fig. 5, the octofoil figure cylinder hole 2 on described top by eight sections inwardly protruded wait the inner cylindrical surface of radiuses and eight sections of outwardly convexs etc. the external cylindrical surface of radius form, eight sections of inner cylindrical surfaces and eight sections of alternate layouts of external cylindrical surface, the gyration center line of the gyration center line of eight sections of inner cylindrical surfaces and eight sections of external cylindrical surfaces is parallel to each other, the gyration center line of eight sections of inner cylindrical surfaces is with the gyration center line parallel of blast chamber type piston 1 and apart from equal, the gyration center line of eight sections of external cylindrical surfaces is with the gyration center line parallel of blast chamber type piston 1 and apart from equal, adjacent inner cylindrical surface is connected with external cylindrical surface is round and smooth.
In embodiment, eight sections of inner cylindrical surface diameters are 57 ~ 59mm, and corresponding central angle is equal, and form octofoil figure protruding, eight sections of diameters are that the gyration center of the inner cylindrical surface of 57 ~ 59mm is in the outside of octofoil figure projection; The diameter of eight sections of external cylindrical surfaces is 17 ~ 19mm, and corresponding central angle is equal, and form octofoil figure pit, the projection of octofoil figure is alternate with the pit of octofoil figure arranges the octofoil figure cylinder hole forming top.The gyration center line minimum distance of pit distance blast chamber type piston 1 is 25 ~ 27mm, eight sections of diameters be the gyration center of the external cylindrical surface of 17 ~ 19mm in the inner side of octofoil figure pit, and corresponding central angle is equal.Eight sections of projections and pit can produce the micro swirl of small scale.
Octofoil figure cylinder hole 2 height on described top is 3 ~ 4mm, too high excessively strong to eddy current inhibitory action, the too low performance not effect in octofoil figure cylinder hole, top.
The octofoil figure cylinder hole 2 on described connection top is 5 ~ 6mm with the subsequent corrosion of the excessive circle ring surface 4 of the dumbbell-like shape turned cavities 3 of bottom, do not produce cusp like this, can heat load be alleviated, the excessive of the circular variable cross section from the octofoil figure cylinder hole 2 on top to bottom can also be realized simultaneously.
Consult Fig. 4, the dumbbell-like shape turned cavities 3 of described bottom is made up of outer toroid arc surface, boss round table surface and end annulus arc surface; Wherein: boss and boss round table surface are arranged in the center of eight lobe dumbbell-like shape firing chamber dumbbell-like shape turned cavities 3, the rotational axis of dumbbell-like shape turned cavities 3 and the rotational axis conllinear of blast chamber type piston 1 in the rotational axis of boss round table surface, eight lobe dumbbell-like shape firing chambers.
The top of outer toroid arc surface adopts excessive circle ring surface 4 to be connected with the bottom in the octofoil figure cylinder hole 2 on top is round and smooth, the bottom of outer toroid arc surface is connected with one end of end annulus arc surface is round and smooth, the other end of end annulus arc surface is connected with the bottom of boss round table surface, exactly, adopt minor radius annulus arc surface by the round and smooth connection of end annulus arc surface and boss round table surface bottom between end annulus arc surface and boss round table surface bottom, prevent heat load overweight.
The radius of the outer toroid arc surface of the dumbbell-like shape turned cavities 3 of embodiment middle and lower part is 10 ~ 11mm, the top width of boss round table surface is 10 ~ 12mm, the bottom width of boss round table surface is 48 ~ 50mm, the top end of boss round table surface is 3 ~ 4mm apart from eight lobe dumbbell-like shape top of combustion chamber distances, boss round table surface large like this occupies the dead band of mixed gas motion, add the utilization ratio of mixed gas, boss round table surface large so also forces eddy motion in firing chamber to be strengthened simultaneously, guide diesel oil fire core to move to eight lobe dumbbell-like shape bottom of combustion chamber, change ignition point position.Connect with the end annulus arc surface that radius is 50 ~ 52mm between outer toroid arc surface and boss round table surface.Radius is that the radius revolution center of the end annulus arc surface of 50 ~ 52mm is in the inner side of dumbbell-like shape turned cavities 3.Radius is adopt radius to be that 5 ~ 6mm small circle ring arc surface will both round and smooth connections between the end annulus arc surface of 50 ~ 52mmm and boss round table surface.
Simulation test:
By to CA6DL2-35E5RB Natural Gas & Diesel Dual Fuel Engine motor research experiment, to former machine ω shape firing chamber and eight lobe dumbbell-like shape firing chambers described in the utility model at 1335r/min, homenergic 25% load, the working procedure under 90% substitution rate operating mode has carried out simulation analysis.Analysis result shows, adopts former machine reducing ω shape firing chamber to make burning bottom of combustion chamber in latter stage and cylinder immediate vicinity remain a large amount of rock gases.Eight lobe dumbbell-like shape bottom of combustion chamber no burning catch fire on eight tops, lobe dumbbell-like shape firing chamber mainly due to diesel oil, and eight lobe dumbbell-like shape bottom of combustion chamber tubulence energies are weak, and diesel pilot fire core can not be propagated to eight lobe dumbbell-like shape bottom of combustion chamber.And cylinder axis is flame propagation end, namely the burning that is not also able to do in time discharges outside cylinder, and both actings in conjunction result in a large amount of HC discharges.In a word, former machine rock gas is imperfect combustion is due to the too weak cause of tubulence energy in point of ignition irrational distribution and firing chamber.
The point of ignition distribution can realized ideal in eight lobe dumbbell-like shape firing chambers described in the utility model simultaneously and the distribution of stronger tubulence energy.
Eight lobe dumbbell-like shape firing chambers described in the utility model are in the stage of catching fire, dumbbell-like shape boss occupies the dead band of mixed gas motion, add the utilization ratio of mixed gas, large boss also forces eddy current in firing chamber outwards to move simultaneously, speed increases, stronger eddy current guides diesel oil fire core to move to bottom of combustion chamber, changes ignition point position, thus point of ignition is distributed rationally.
Eight lobe dumbbell-like shape firing chambers described in the utility model are in the flame propagation stage, flow and small scale eddy current because octofoil figure cylinder hole can produce stronger inverse squeezing on the one hand, the octofoil figure cylinder hole on top, dumbbell-like shape turned cavities 3 circular cross-section of bottom change the stronger eddy current caused on the other hand, both cause tubulence energy to have a very wide distribution at acting in conjunction, and keep higher level for a long time, thus make Flame of Natural Gas bamboo telegraph.
Analog reslt:
1. consult Fig. 6 to Fig. 8, eight described lobe dumbbell-like shape firing chambers are higher by about 13% than former machine reducing ω shape firing chamber in-cylinder pressure peak value, and power character improves about 38%; In cylinder, in the cylinder of mean temperature peakedness ratio former machine reducing ω shape firing chamber, mean temperature peak value is high by about 26%;
There are two obvious rate of heat release peak values in eight described lobe dumbbell-like shape firing chambers, and the second rate of heat release peakedness ratio first rate of heat release peak value is taller.Main cause is that eight lobe dumbbell-like shape firing chambers produce the velocity of propagation that larger tubulence energy facilitates Flame of Natural Gas in the process of flame propagation in cylinder, makes rock gas more complete as main fuel burning.
2. consult Fig. 9, eight described lobe dumbbell-like shape firing chamber diesel oil delay periods are long, and it is many to participate in the diesel oil amount of premix, mixing more even, diesel combustion more complete.Simultaneously ignite after the catching fire burning things which may cause a fire disaster of rock gas of diesel oil is many, be distributed in each corner of eight lobe dumbbell-like shape firing chambers, stronger tubulence energy improves Flame of Natural Gas velocity of propagation, impel the rock gas perfect combustion of not firing in original firing chamber, residual capacity is less than 1%, improve Economy, greatly reduce the HC discharge caused because rock gas is imperfect combustion.
3. consult Figure 10 and Figure 11, eight described lobe dumbbell-like shape firing chamber soot reduce ten times compared to former machine, and NO only improves 1.5 times.
Claims (6)
1. the piston of equipped with combustion chamber in a duel fuel engine, it is characterized in that, in described duel fuel engine, the piston of equipped with combustion chamber and the center on blast chamber type piston (1) top arrange eight lobe dumbbell-like shape firing chambers, the axis of symmetry of eight lobe dumbbell-like shape firing chambers and the axis of symmetry conllinear of blast chamber type piston (1);
Eight described lobe dumbbell-like shape firing chambers are formed by connecting by the octofoil figure cylinder hole (2) on top, the dumbbell-like shape turned cavities (3) of bottom and the excessive circle ring surface (4) that adopts between the two.
2. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 1, it is characterized in that, described octofoil figure cylinder hole (2) by eight sections inwardly protruded wait the inner cylindrical surface of radiuses and eight sections of outwardly convexs etc. the external cylindrical surface of radius form, eight sections of inner cylindrical surfaces and eight sections of alternate layouts of external cylindrical surface, the gyration center line of the gyration center line of eight sections of inner cylindrical surfaces and eight sections of external cylindrical surfaces is parallel to each other, the gyration center line of eight sections of inner cylindrical surfaces is with the gyration center line parallel of blast chamber type piston (1) and apart from equal, the gyration center line of eight sections of external cylindrical surfaces is with the gyration center line parallel of blast chamber type piston (1) and apart from equal, adjacent inner cylindrical surface is connected with external cylindrical surface is round and smooth.
3. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 2, it is characterized in that, eight sections of described inner cylindrical surface diameters are 57 ~ 59mm, the diameter of eight sections of external cylindrical surfaces is 17 ~ 19mm, the gyration center line minimum distance of eight sections of external cylindrical surfaces distance blast chamber type piston (1) is 25 ~ 27mm, and the height in octofoil figure cylinder hole (2) is 3 ~ 4mm.
4. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 1, it is characterized in that, described dumbbell-like shape turned cavities (3) is made up of outer toroid arc surface, boss round table surface and end annulus arc surface; Wherein: boss and boss round table surface are arranged in the center of eight lobe dumbbell-like shape firing chambers dumbbell-like shape turned cavities (3), the rotational axis of dumbbell-like shape turned cavities (3) and the rotational axis conllinear of blast chamber type piston (1) in the rotational axis of boss round table surface, eight lobe dumbbell-like shape firing chambers;
The top of outer toroid arc surface adopts excessive circle ring surface (4) to be connected with the bottom in the octofoil figure cylinder hole (2) on top is round and smooth, the bottom of outer toroid arc surface is connected with one end of end annulus arc surface is round and smooth, the other end of end annulus arc surface is connected with the bottom of boss round table surface, exactly, adopt small circle ring arc surface by the round and smooth connection of end annulus arc surface and boss round table surface bottom between the other end of end annulus arc surface and boss round table surface bottom.
5. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 4, it is characterized in that, the radius of the outer toroid arc surface of described dumbbell-like shape turned cavities (3) is 10 ~ 11mm, the bottom diameter of boss round table surface is 48 ~ 50mm, the top end diameter of boss round table surface is 10 ~ 12mm, the top end of boss round table surface is 3 ~ 4mm apart from eight lobe dumbbell-like shape top of combustion chamber distances, and the radius of end annulus arc surface is 50 ~ 52mm, and the radius of small circle ring arc surface is 5 ~ 6mm.
6. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 1, it is characterized in that, the subsequent corrosion that described excessive circle ring surface (4) namely connects the excessive circle ring surface (4) of the outer toroid arc surface in the octofoil figure cylinder hole (2) on top and the dumbbell-like shape turned cavities (3) of bottom is 5 ~ 6mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193517.7U CN204493000U (en) | 2015-04-01 | 2015-04-01 | The piston of equipped with combustion chamber in duel fuel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520193517.7U CN204493000U (en) | 2015-04-01 | 2015-04-01 | The piston of equipped with combustion chamber in duel fuel engine |
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| CN204493000U true CN204493000U (en) | 2015-07-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763551A (en) * | 2015-04-01 | 2015-07-08 | 吉林大学 | Piston with combustion chamber in dual-fuel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763551A (en) * | 2015-04-01 | 2015-07-08 | 吉林大学 | Piston with combustion chamber in dual-fuel engine |
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