CN204877701U - Piston of dual -fuel engine middle finishing combuster - Google Patents
Piston of dual -fuel engine middle finishing combuster Download PDFInfo
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- CN204877701U CN204877701U CN201520601458.2U CN201520601458U CN204877701U CN 204877701 U CN204877701 U CN 204877701U CN 201520601458 U CN201520601458 U CN 201520601458U CN 204877701 U CN204877701 U CN 204877701U
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Abstract
The utility model discloses a piston of dual -fuel engine middle finishing combuster, gas mixture concentration aims at overcoming under the natural gas / little load of diesel oil dual -fuel engine owing to being rare, the temperature is low in the jar, flame speed waits the reason to cause natural gas incomplete combustion slowly, the thermal efficiency is low, CH4 discharges too high shortcoming, the center department that piston of dual -fuel engine middle finishing combuster burns cell -type piston (1) top promptly sets up a four corners dumbbell shape combustion chamber, four corners dumbbell shape combustion chamber is by tetragonal cylinder hole (2) on upper portion, the dumbbell shape gyration chamber (3) and the excessive ring curved surface (4) of lower part are constituteed, the connection is arranged by four sections rectangle planes and four sections faces of cylinder are alternate in quadrangle cylinder hole (2), and dumbbell shape gyration chamber (3) is connected gradually with boss round platform face by outer ring arc surface, end ring arc surface and forms, and the bottom of tetragonal cylinder hole (2) on upper portion is connected with the top adoption excessive ring curved surface (4) in the dumbbell of lower part shape gyration chamber (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, can adopt larger compression ratio, improves the thermal efficiency.
But, inevitably there are some problems in Natural Gas & Diesel Dual Fuel Engine motor, wherein comparatively distinct issues are due to adverse condition such as mixture strength are rare, cylinder temperature is low, velocity of propagation of flame is slow under Smaller load, easily there is flameout phenomenon, thus cause combustion of natural gas incomplete, a large amount of CH4 does not just discharge outside cylinder through burning, causes a large amount of CH4 discharges.Especially under high substitution rate, problem is more serious.In order to address this problem, by the shape of optimal design firing chamber, turbulent flow in cylinder can be organized, improving mixture combustion speed, improve the combustion process of Natural Gas & Diesel Dual Fuel Engine motor.Be not the firing chamber of Natural Gas & Diesel Dual Fuel Engine engine design at present both at home and abroad specially, modal for continuing to use the reducing ω shape firing chamber being applicable to diesel engine.And Natural Gas & Diesel Dual Fuel Engine motor has 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 overcomes that the combustion of natural gas caused due to reasons such as mixture strength are rare, cylinder temperature is low, velocity of propagation of flame is slow under Natural Gas & Diesel Dual Fuel Engine small engine load is incomplete, the thermal efficiency is low, CH4 discharges too high shortcoming, 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 dumbbell-like shape firing chamber, a corner, the axis of symmetry of dumbbell-like shape firing chamber, corner and the axis of symmetry conllinear of blast chamber type piston;
Described dumbbell-like shape firing chamber, corner is made up of the tetragonal cylinder hole on top, the dumbbell-like shape turned cavities of bottom and excessive circle ring surface;
The bottom in tetragonal cylinder hole on top adopts excessive circle ring surface to be connected with the top of the dumbbell-like shape turned cavities of bottom.
Tetragonal cylinder hole described in technological scheme is made up of four sections of rectangle planes and four sections of cylndrical surface, four sections of cylndrical surface and four sections of alternate layouts of rectangle plane, every section of cylndrical surface is tangent connection with the rectangle plane of its both sides, the quadrangle symmetrical center line in cylinder hole and the gyration center line conllinear of blast chamber type piston, the gyration center line parallel of four sections of rectangle planes and blast chamber type piston and apart from equal, the gyration center line of four sections of cylndrical surface is with the gyration center line parallel of blast chamber type piston and apart from equal.
The length of section rectangle plane of four described in technological scheme is 42mm ~ 44mm, and the radius of four sections of cylndrical surface is 3mm ~ 4mm, and the height in tetragonal cylinder hole is 3mm ~ 4mm.
The subsequent corrosion of the excessive circle ring surface on the connection quadrangle bottom, cylinder hole described in technological scheme and dumbbell-like shape turned cavities top is 3mm ~ 4mm.
Dumbbell-like shape turned cavities described in technological scheme comprises outer toroid arc surface, boss round table surface and end annulus arc surface; Boss round table surface is positioned at the center of dumbbell-like shape turned cavities, the rotational axis conllinear of the rotational axis of boss round table surface, the rotational axis of dumbbell-like shape turned cavities and blast chamber type piston; The bottom of outer toroid arc surface is connected with the outer end of end annulus arc surface, and the inner end of end annulus arc surface is connected with the bottom of boss round table surface.
The inner end of the end annulus arc surface described in technological scheme is connected with the bottom of boss round table surface and refers to: adopt minor radius annulus arc surface to be connected in the inner end of end annulus arc surface and the bottom of boss round table surface.
The radius of the outer toroid arc surface of the dumbbell-like shape turned cavities described in technological scheme is 10mm ~ 11mm, the bottom diameter of boss round table surface is 48mm ~ 50mm, the top end diameter of boss round table surface is 10mm ~ 12mm, the top end of boss round table surface is 4mm ~ 5mm apart from corner dumbbell-like shape top of combustion chamber distance, the radius of end annulus arc surface is 40mm ~ 42mm, the gyration center of end annulus arc surface is in the inner side of dumbbell-like shape turned cavities, and the radius of minor radius annulus arc surface is 6mm ~ 8mm.
Compared with prior art the beneficial effects of the utility model are:
1. the most close with the piston of equipped with combustion chamber in duel fuel engine described in the utility model is Japanese little Song micro swirl firing chamber, different from the utility model suitable application area.And the quadrangle on top, little Song micro swirl firing chamber and the joint of bottom circle directly excessive with circular arc, top, firing chamber described in the utility model is highly the tetragonal cylinder of 3 ~ 4mm, straight degree of lip-rounding firing chamber, top, and then with the round chamber of excessive circular sliding slopes bottom.The boss shape of little Song micro swirl firing chamber and size also have a great difference with firing chamber described in the utility model, and boss described in the utility model is large compared with little Song micro swirl firing chamber, and such boss plays the effect of drainage to diesel oil.
2. in duel fuel engine described in the utility model, the piston of equipped with combustion chamber can change the fire location of diesel pilot compared to former machine, thus diesel-fuel ignition point is distributed rationally.
3. the piston being processed with dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model flows with inverse squeezing owing to can produce stronger crowded stream on the one hand compared to former machine, and top quadrangle, bottom dumbbell-shaped section change the stronger eddy current caused on the other hand.Both achieve the average tubulence energy improved in cylinder jointly, organize flowing fast in cylinder, improve the effect of Flame of Natural Gas velocity of propagation.
4. when the piston being processed with dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model carries out numerical simulation 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, maximum outbreak pressure improves about 9% than former machine reducing ω shape firing chamber, improves power character.
5. when the piston being processed with dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model carries out numerical simulation under 1335r/min, homenergic 25% load and 90% substitution rate operating mode, first rate of heat release peak value and former machine are suitable, and the high and crank angle of correspondence of the former machine of the second rate of heat release peakedness ratio in advance.
6. when the piston being processed with dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model carries out numerical simulation under 1335r/min, homenergic 25% load and 90% substitution rate operating mode, former machine rock gas residual capacity is close to 30%, and be about 1% by dumbbell-like shape firing chamber, corner rock gas residual capacity, greatly reduce the CH4 caused because rock gas is imperfect combustion and discharge high phenomenon.Soot discharges more former machine and reduces by 3 times, and the more former machine of NO improves 10%.
7. the piston being processed with dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model is slightly poorer than eight lobe dumbbell-like shape chamber performances of this seminar invention before, but processing technology is simple, can be cost-saving, realize the Proper Match of duel fuel engine firing chamber.
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 plan view of 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;
The plan view of the corner dumbbell-like shape firing chamber 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 corner dumbbell-like shape firing chamber 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;
In the cylinder of the dumbbell-like shape firing chamber, corner of Fig. 5 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, average tubulence energy is with the change curve of crank angle;
In the cylinder of the dumbbell-like shape firing chamber, corner 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;
The cylinder temperature of the corner dumbbell-like shape firing chamber 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 is with the change curve of crank angle;
The corner dumbbell-like shape firing chamber 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 corner dumbbell-like shape firing chamber 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;
In figure: 1. blast chamber type piston, 2. tetragonal 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, the top extensively adopted for current duel fuel engine in figure is processed with the piston of reducing ω shape firing chamber, and this top, firing chamber is convergent cylindrical hole, and bottom is ω shape turned cavities, adopts circle ring surface to connect 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 described in the prior art 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 dumbbell-like shape firing chamber, a corner in duel fuel engine described in the utility model, the axis of symmetry of dumbbell-like shape firing chamber, corner and the axis of symmetry conllinear of blast chamber type piston 1.
Consult Fig. 3 and Fig. 4, the dumbbell-like shape firing chamber, corner in duel fuel engine described in the utility model on the piston of equipped with combustion chamber and blast chamber type piston 1 is formed by connecting by the tetragonal 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. 4, described tetragonal cylinder hole is made up of four sections of rectangle planes and four sections of cylndrical surface, four sections of cylndrical surface and four sections of alternate layouts of rectangle plane, every section of cylndrical surface is tangent connection with the rectangle plane of its both sides, the quadrangle symmetrical center line in cylinder hole and the gyration center line conllinear of blast chamber type piston, the gyration center line parallel of four sections of rectangle planes and blast chamber type piston and apart from equal, the gyration center line of four sections of cylndrical surface is with the gyration center line parallel of blast chamber type piston and apart from equal.
Four sections of described rectangle plane length are 42 ~ 44mm, four sections of cylndrical surface radiuses are 3 ~ 4mm, and tetragonal cylinder hole is high is 3 ~ 4mm, too high excessively strong to eddy current inhibitory action, the effect in too low performance not top quadrangle cylinder hole, tetragonal cylinder hole can produce small scale eddy current simultaneously.
The subsequent corrosion of the excessive circle ring surface 4 on the tetragonal bottom, cylinder hole 2 on described connection top and dumbbell-like shape turned cavities 3 top of bottom is 3 ~ 4mm, do not produce cusp like this, can heat load be alleviated, the excessive of the circular variable cross section from the tetragonal cylinder hole 2 on top to bottom can also be realized simultaneously.
Consult Fig. 3, 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 dumbbell-like shape firing chamber, corner 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, dumbbell-like shape firing chamber, corner.
The top of outer toroid arc surface adopts excessive circle ring surface 4 to be connected with the bottom in the tetragonal cylinder hole 2 on top is round and smooth, the bottom of outer toroid arc surface is connected with the outer end of end annulus arc surface is round and smooth, the inner end of end annulus arc surface is connected with the bottom of boss round table surface is tangent, 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 end diameter of boss round table surface is 10 ~ 12mm, the bottom diameter of boss round table surface is 48 ~ 50mm, the top end of boss round table surface is 4 ~ 5mm apart from the corner dumbbell-like shape top of combustion chamber top end of blast chamber type piston 1 (i.e.) distance, 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, diesel oil fire core is guided to move to corner dumbbell-like shape bottom of combustion chamber, change ignition point position.Connect with the end annulus arc surface that radius is 40 ~ 42mm between outer toroid arc surface and boss round table surface.Radius is that the radius revolution center of the end annulus arc surface of 40 ~ 42mm is in the inner side of dumbbell-like shape turned cavities 3.Radius is adopt radius to be that 6 ~ 8mm minor radius annulus arc surface will both round and smooth connections between the end annulus arc surface of 40 ~ 42mmm 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 dumbbell-like shape firing chamber, corner 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:
Former machine reducing ω shape firing chamber is adopted to make burning bottom of combustion chamber in latter stage and cylinder immediate vicinity remain a large amount of rock gases.Former machine bottom of combustion chamber no burning catches fire on top, former machine firing chamber mainly due to diesel oil, and former machine bottom of combustion chamber tubulence energy is weak, and diesel pilot fire core can not be propagated to 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 dumbbell-like shape firing chamber, corner described in the utility model simultaneously and the distribution of stronger tubulence energy.
Dumbbell-like shape firing chamber, corner described in the utility model is 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.
Dumbbell-like shape firing chamber, corner described in the utility model is in the flame propagation stage, flow and small scale eddy current because tetragonal cylinder hole can produce stronger inverse squeezing on the one hand, the tetragonal 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. 5, described dumbbell-like shape firing chamber, corner is improved greatly compared to tubulence energy average in the cylinder of former machine reducing ω shape firing chamber.
2. consult Fig. 6 to Fig. 8, described dumbbell-like shape firing chamber, corner is due to tubulence energy increase average in cylinder, and in cylinder, maximum outbreak pressure improves about 9% than former machine reducing ω shape firing chamber, improves power character; 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 27%, improves the combustion condition in cylinder.
There are two obvious rate of heat release peak values in described dumbbell-like shape firing chamber, corner.Main cause is that dumbbell-like shape firing chamber, corner produces 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.
3. consult Fig. 9, because In-Cylinder Flow strengthens after described dumbbell-like shape firing chamber, corner diesel oil catches fire, diesel oil mixes fully with surrounding mixed gas, thus diesel oil point of ignition is widely distributed, the burning things which may cause a fire disaster of rock gas of igniting is many, be distributed in each corner of dumbbell-like shape firing chamber, corner, simultaneously 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 about 1%, improve Economy, greatly reduce the CH4 discharge caused because rock gas is imperfect combustion.Soot discharges more former machine and reduces by 3 times, and the more former machine of NO improves 10%.
Claims (7)
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 dumbbell-like shape firing chamber, a corner, the axis of symmetry of dumbbell-like shape firing chamber, corner and the axis of symmetry conllinear of blast chamber type piston (1);
Described dumbbell-like shape firing chamber, corner is made up of the tetragonal cylinder hole (2) on top, the dumbbell-like shape turned cavities (3) of bottom and excessive circle ring surface (4);
The bottom of tetragonal cylinder hole (2) on top adopts excessive circle ring surface (4) to be connected with the top of the dumbbell-like shape turned cavities (3) of bottom.
2. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 1, it is characterized in that, described tetragonal cylinder hole (2) is made up of four sections of rectangle planes and four sections of cylndrical surface, four sections of cylndrical surface and four sections of alternate layouts of rectangle plane, every section of cylndrical surface is tangent connection with the rectangle plane of its both sides, the symmetrical center line of quadrangle cylinder hole (2) and the gyration center line conllinear of blast chamber type piston (1), the gyration center line parallel of four sections of rectangle planes and blast chamber type piston (1) and apart from equal, the gyration center line of four sections of cylndrical surface is with the gyration center line parallel of blast chamber type piston (1) and apart from equal.
3. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 2, it is characterized in that, the length of four sections of described rectangle planes is 42mm ~ 44mm, and the radius of four sections of cylndrical surface is 3mm ~ 4mm, and the height of tetragonal cylinder hole (2) is 3mm ~ 4mm.
4. 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 of described connection quadrangle (2) bottom, cylinder hole and the excessive circle ring surface (4) on dumbbell-like shape turned cavities (3) top is 3mm ~ 4mm.
5. 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) comprises outer toroid arc surface, boss round table surface and end annulus arc surface; Boss round table surface is positioned at the center of dumbbell-like shape turned cavities (3), the rotational axis conllinear of the rotational axis of boss round table surface, the rotational axis of dumbbell-like shape turned cavities (3) and blast chamber type piston (1);
The bottom of outer toroid arc surface is connected with the outer end of end annulus arc surface, and the inner end of end annulus arc surface is connected with the bottom of boss round table surface.
6. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 5, it is characterized in that, the inner end of described end annulus arc surface is connected with the bottom of boss round table surface and refers to: adopt minor radius annulus arc surface to be connected in the inner end of end annulus arc surface and the bottom of boss round table surface.
7. according to the piston of equipped with combustion chamber in duel fuel engine according to claim 5, it is characterized in that, the radius of the outer toroid arc surface of described dumbbell-like shape turned cavities (3) is 10mm ~ 11mm, the bottom diameter of boss round table surface is 48mm ~ 50mm, the top end diameter of boss round table surface is 10mm ~ 12mm, the top end of boss round table surface is 4mm ~ 5mm apart from corner dumbbell-like shape top of combustion chamber distance, the radius of end annulus arc surface is 40mm ~ 42mm, the gyration center of end annulus arc surface is in the inner side of dumbbell-like shape turned cavities (3), the radius of minor radius annulus arc surface is 6mm ~ 8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520601458.2U CN204877701U (en) | 2015-08-07 | 2015-08-07 | Piston of dual -fuel engine middle finishing combuster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520601458.2U CN204877701U (en) | 2015-08-07 | 2015-08-07 | Piston of dual -fuel engine middle finishing combuster |
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| CN204877701U true CN204877701U (en) | 2015-12-16 |
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| CN201520601458.2U Expired - Fee Related CN204877701U (en) | 2015-08-07 | 2015-08-07 | Piston of dual -fuel engine middle finishing combuster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989544A (en) * | 2015-08-07 | 2015-10-21 | 吉林大学 | Piston with processed combustion chamber in dual-fuel engine |
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2015
- 2015-08-07 CN CN201520601458.2U patent/CN204877701U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989544A (en) * | 2015-08-07 | 2015-10-21 | 吉林大学 | Piston with processed combustion chamber in dual-fuel engine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |