CN103321744A - No-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine - Google Patents
No-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine Download PDFInfo
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- CN103321744A CN103321744A CN2013102956602A CN201310295660A CN103321744A CN 103321744 A CN103321744 A CN 103321744A CN 2013102956602 A CN2013102956602 A CN 2013102956602A CN 201310295660 A CN201310295660 A CN 201310295660A CN 103321744 A CN103321744 A CN 103321744A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a no-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine which comprises a cylinder body, special-shaped pistons, a crank-link mechanism and a valve seat air distributing system. An air cylinder is arranged inside the cylinder body. Two special-shaped piston heads are arranged inside the air cylinder in a butt joint mode. The special-shaped piston heads are connected with the crank-link mechanism and then connected with the valve seat air distributing system in a gear meshing mode so that the two special-shaped pistons move synchronously in the opposite direction in the air cylinder, and therefore the two special-shaped pistons, the crank-link mechanism and the valve seat air distributing system finish the four-stroke motion together. Moreover, four piston grooves and two piston top inclined faces are arranged in the positions of heat power banks of the special-shaped pistons to avoid opening and closing of a valve of the valve seat air distributing system. When the special-shaped pistons run to the top dead center of a compression stroke, two combustion chambers with the same size are formed in the positions of the gaps of the pistons top inclined faces and the valve. The no-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine has the advantages of being high in compression ratio, high in rotating speed, stable in operation, large in torque power and long in service life, does not knock easily, saves energy, reduces emission, is green and protects environment.
Description
Technical field
The present invention relates to a kind of stroke piston combustion engine, relate in particular to a kind of without the horizontal quartastroke engine in cylinder cap double combustion chamber.
Background technique
Internal-combustion engine is a kind of of heat engine, the chemical energy of fuel can be transformed mechanical energy.General implementation is, fuel and air mixed combustion produce heat energy, and when gases are heated, they expand, is converted into mechanical energy by mechanical device and externally does work.Internal-combustion engine has very widely to be used, and the motor of automobile, boats and ships, aircraft, engineering machinery etc. substantially all is internal-combustion engine.
Modal internal-combustion engine belongs to stroke piston combustion engine.Behind the interior air of cylinder and the mixture combustion of fuel, pressurized gas pushing piston connecting rod produces moment of torsion, externally does work by bent axle, and namely the chemical energy of fuel finally is converted into the kinetic energy of crankshaft rotating.Petrol engine generally is spark-ignition engine, the mixed gas of fuel and air at the end of compression stroke by spark ignitor, expand immediately and pushing piston reciprocating; And diesel engine also is compression ignition engine, and fuel is injected into generally that cylinder is concurrent is conigenous combustion, and the mixed gas after the spontaneous combustion has also promoted piston because of expansion.Except light with these two kinds of major ways of compression ignite, also have the combined type combustion process, have the characteristics of lighting with compression ignition internal combustion engine concurrently.
The operation cycle of four-stroke stroke piston combustion engine is divided into altogether Four processes of air inlet, compression, acting, exhaust.By air inlet and exhaust, fuel and working medium to be changed, working stroke then is that heat energy is converted into mechanical energy.Finish the four stroke cycle that is known as of circulation by four strokes (being piston moves to the other end from an end of cylinder), motor car engine adopts this form more.
The internal-combustion engine of at present tradition use is provided with cylinder cap, and combustion chamber surface to volume ratio is larger, more easily produces pinking, so allowable compression ratio is lower, because of a cylinder one piston, the stroke piston diameter is larger again, so the piston linear velocity is higher, limited the rotating speed of traditional combustion engine.
Summary of the invention
The technical assignment of technical problem to be solved by this invention and proposition is that prior art is improved, provide a kind of without the horizontal quartastroke engine in cylinder cap double combustion chamber, solve the long limit engine rotating speed of piston stroke of internal-combustion engine in the present technology, the larger problem that easily produces pinking of combustion chamber surface to volume ratio.
For solving above technical problem, technological scheme of the present invention is:
A kind of without the horizontal quartastroke engine in cylinder cap double combustion chamber, comprise cylinder body, special-shaped piston, connecting rod, the valve seat insert gas distribution system, a cylinder is arranged in cylinder body, two special-shaped pistons head to head are placed in the cylinder, the parallel two ends that are assemblied in cylinder body of the bent axle of two connecting rods, two special-shaped pistons respectively are connected with the bent axle of the connecting rod at cylinder body two ends by a connecting rod, two valve seat insert gas distribution systems hold on the hole by the valve seat insert that valve seat insert adopts the mode of transition fit processing to be installed on the circumference of cylinder body center, so that dismounting and heat radiation, and installed the valve seat pad additional and be used for sealing, connecting rod is provided with crankshaft gear, each is connected with a joggle with the camshaft gear wheel of a valve seat insert gas distribution system, the camshaft gear wheel of two valve seat insert gas distribution systems is connected with a joggle togather again, reach two camshaft gear wheels and two crankshaft gear timings synchronously and along the phase counterclockwise rotation, two special-shaped piston synchronous relative motions in cylinder, thereby realize two special-shaped pistons, the collaborative four-stroke of finishing of connecting rod and valve seat insert gas distribution system, and the firepower bank place of special-shaped piston is processed with four pistion recess and two piston top inclined-planes to dodge the keying of valve seat insert gas distribution system valve, and when special-shaped piston runs to the compression stroke top dead center, the piston top inclined-plane, pistion recess forms two firing chambers that volume is identical with space, valve seat insert place.In the cylinder of traditional internal-combustion engine, a cylinder one piston, thus the running length of piston is longer, so the space rate of piston is higher, but the rotating speed that is transformed into crank gear is just lower, causes the moment of torsion of internal-combustion engine less.Two special-shaped pistons of device in the cylinder of this present invention at internal-combustion engine, and be synchronized with the movement in opposite directions, the total volume that expands after the fuel combustion is constant, but passed to the special-shaped piston of both direction, so that the stroke of each special-shaped piston reduces by half, the space rate of special-shaped piston has reduced even so, but its rotating speed of changing to crank gear has improved, thereby double-crankshaft has improved the moment of torsion of internal-combustion engine by crankshaft gear and the stack of camshaft gear wheel meshing torque.Two special-shaped pistons in the cylinder are connected on the connecting rod of same structure, connecting rod is connected with camshaft gear wheel by the mode of gear engagement again, two camshaft gear wheels are connected with a joggle togather again, thereby so that two special-shaped pistons form the integral body of acting in agreement, the high consistency of both motion speed, avoid occurring a special-shaped piston and run to cylinder axis, and another profiled air cylinder also is in the phenomenon at cylinder edge, so that two special-shaped piston energy synergy movements are effectively finished aspirating stroke, compression stroke, the action of whole four strokes of expansion stroke and exhaust stroke.The piston top inclined-plane.The surface to volume ratio of two firing chambers that pistion recess and space, valve seat insert place form is smaller, and the burning meeting of fuel is very rapid, therefore is difficult for pinking occurs, and reduces vibrations and the noise of internal-combustion engine, increases operation stability.
Further, one and above cylinder can be set in the cylinder body, carry out the multi cylinder interlock and improve output power.
Further, be processed with annular groove on the circumference of special-shaped piston and be used for ring installation for sealing.
Further, the valve seat insert gas distribution system can be provided with four groups, four groups of valve seat insert gas distribution systems distribute along the cross-section center line bilateral symmetry of cylinder, are provided with also between two groups of valve seat insert gas distribution systems on the cylinder that spark plug is used for the Spark ignition type petrol engine or diesel oil injection nozzle is used for compression ignition diesel engine.Four groups of valve seat insert gas distribution systems are set in the central position of cylinder, but the gas flow during Effective Raise turnover gas improves the efficient that passes in and out gas, avoids fuel combustion insufficient, cause the power of internal-combustion engine to reduce, and insufficient dustiness of exhausting air that also can cause that burns is higher.The acting of expanding of the spark plug fire fuel of lighting a fire when special-shaped piston moves to compression top center, fuel combustion promotes special-shaped piston and advances to the both sides of cylinder.When special-shaped piston was advanced to the two ends of cylinder, diesel oil injection nozzle moved to compression top center at special-shaped piston and spray into diesel oil in cylinder, and the diesel combustion expansion promotes special-shaped piston and advances to the both sides of cylinder.
Further, camshaft gear wheel and crankshaft gear adopt herringbone tooth or straight-tooth, helical teeth, reduce the end thrust of noise and the rotatingshaft of gear train.
Further, the valve seat insert gas distribution system comprises valve seat insert, valve, valve collar, spring, spring seat, porting, valve rocker and camshaft, porting and the valve seat insert UNICOM that is installed on the cylinder body, valve collar is installed on the valve seat insert, valve passes valve seat insert and is connected with spring seat with valve collar, top valve adjustments nut valve gap adjustment, spring is placed on the valve and is used for resetting of valve between valve seat insert and spring seat and reaches the effect of closing valve, camshaft makes valve rocker open and close valve along pitman arm shaft rotary compression spring by the camshaft gear wheel driven rotary.In four-stroke process of special-shaped piston, camshaft rotates a circle 360 °, and its salient point direction rotation is during to the point of contact of valve rocker, and the jack-up valve rocker makes it Compress Spring, thereby opens valve, reaches the function of air inlet and exhaust.
Further, also be provided with cooling system without the horizontal quartastroke engine in cylinder cap double combustion chamber, be provided with the water jacket of ring-type on the cylindrical shell of cylinder body, water tank is connected to by sewer and is connected on the water pump on the thermostat, be transported in the water jacket by intake pipe after the cooling water pressurization, cooling internal combustion engines is finished cool cycles by getting back to water tank by outlet pipe.Adopt water-cooled circulating cooling system, also energy-conserving and environment-protective when cooling effectiveness is high, thermostat is regulated the water yield that enters radiator automatically according to the height of cooling water temperature, change the water circuit scope, to regulate the heat dissipation potential of cooling system, the assurance internal-combustion engine is worked in suitable temperature range, can guarantee that internal-combustion engine was unlikely to cold when winter.
Further, be provided with fan electromotor on the water tank, adopt air-cooled to cooling water temperature.
Compared with prior art, the invention has the advantages that:
Of the present inventionly overcome the deficiencies in the prior art without the horizontal quartastroke engine in cylinder cap double combustion chamber, traditional firing chamber is separated into two firing chambers that volume is less, thereby burning is difficult for rapidly pinking, and double-piston moves simultaneously, so allowable compression ratio is higher; The stroke piston diameter is than smaller, and the piston linear velocity is less, and allowable rotating speed is higher, and the positive inhour of two cover piston crank linkage mechanisms of equal in quality is rotated, and has alleviated vibrations and the noise of internal-combustion engine; Fabricated valve seat insert assembly for the maintain and replace valve assembly provides convenience, has reduced cost; Internal combustion engine operation of the present invention is steady, and torque power is large, and the life-span is long, and energy-saving and emission-reduction, environmental protection.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of special-shaped piston of the present invention;
Fig. 3 is the cross-sectional structure schematic diagram of petrol engine four air valves of the present invention;
Fig. 4 is the diesel engine four family of power and influence's of the present invention cross-sectional structure schematic diagram;
Fig. 5 is the structural representation of air valve of the present invention;
Fig. 6 is the structural representation of cooling system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who obtains under the creative work prerequisite.
The embodiment of the invention discloses a kind of without the horizontal quartastroke engine in cylinder cap double combustion chamber, with realization internal combustion engine high pressure contracting ratio, and high rotating speed, operating steadily is purpose.
Referring to Fig. 1, without the horizontal quartastroke engine in cylinder cap double combustion chamber, comprise cylinder body 1, special-shaped piston 2, connecting rod, the valve seat insert gas distribution system, a cylinder 3 is arranged in cylinder body 1, two special-shaped pistons 2 head to head are placed in the cylinder 3, the bent axle 32 parallel two ends that are assemblied in cylinder body 1 of two connecting rods, two special-shaped pistons 2 respectively are connected with the bent axle 32 of the connecting rod at cylinder body 1 two ends by a connecting rod 4, the valve seat insert that the valve seat insert 13 of two valve seat insert gas distribution systems adopts the mode of transition fit processing to be installed on the cylinder body 1 center circumference holds on the hole 5, so that dismounting and heat radiation, and installed valve seat pad 33 additional and be used for sealing, connecting rod is provided with crankshaft gear 6, each is connected with a joggle with the camshaft gear wheel 7 of a valve seat insert gas distribution system, the camshaft gear wheel 7 of two valve seat insert gas distribution systems is connected with a joggle togather again, camshaft gear wheel 7 is 2:1 with the gear ratio of crankshaft gear 6, camshaft gear wheel 7 and crankshaft gear 6 adopt herringbone tooth, reduce the end thrust of noise and the rotatingshaft of gear train, reach two camshaft gear wheels 7 and two crankshaft gear 6 timings synchronously and along the phase counterclockwise rotation, two special-shaped piston 2 synchronous relative motions in cylinder 3, thus realize two special-shaped pistons 2, the collaborative four-stroke of finishing of connecting rod and valve seat insert gas distribution system.More than one cylinder 3 can be set the cylinder body 1 of internal-combustion engine is interior, carry out the multi cylinder interlock and improve output power.
Referring to Fig. 2, the firepower bank place of special-shaped piston 2 is processed with four pistion recess 9 and two piston top inclined-planes 10 to dodge the keying of valve seat insert gas distribution system valve 14, and when special-shaped piston 2 ran to the compression stroke top dead center, piston top inclined-plane, pistion recess formed two firing chambers 8 that volume is identical with space, valve seat insert place.Be processed with annular groove 11 on the circumference of special-shaped piston 2 and be used for ring installation.
Referring to Fig. 3 and Fig. 4, the valve seat insert gas distribution system can be provided with four groups, four groups of valve seat insert gas distribution systems distribute along the cross-section center line bilateral symmetry of cylinder 3, also be provided with spark plug 12 or diesel oil injection nozzle 31 between two groups of valve seat insert gas distribution systems on the cylinder 3, settle different elements according to the firing mode that diesel engine is different with petrol engine, air intake valve and the valve of giving vent to anger respectively arrange two, can improve other efficiency of transmission, the assurance fuel combustion is abundant, reduces exhaust emission.
Referring to Fig. 5, the valve seat insert gas distribution system comprises valve seat insert 13, valve 14, valve collar 15, spring 16, spring seat 17, porting 18, valve rocker 19 and camshaft 20, valve seat insert on valve seat insert 13 and the cylinder body 3 holds hole 5 and adopts the mode of transition fit processing to install, so that dismounting and heat radiation, porting 18 and valve seat insert 13 UNICOMs, valve collar 15 is installed on the valve seat insert 13, valve 14 passes valve seat insert 13 and valve collar 15, valve adjustments nut 21 valve gap adjustments, the top of valve 14 also is connected with spring seat 17, spring 16 is placed on the valve 14 and is used for resetting of valve 14 between valve seat insert 13 and spring seat 16 and reaches the effect of closing valve 14, camshaft 20 makes valve rocker 19 open and close valve along pitman arm shaft 22 rotary compression springs 16 by camshaft gear wheel 7 driven rotary.
Referring to Fig. 6, also be provided with cooling system without the horizontal quartastroke engine in cylinder cap double combustion chamber, be provided with the water jacket 23 of ring-type on the cylindrical shell of cylinder body 1, water tank 24 is connected to by sewer 26 and is connected on the water pump 28 on the thermostat 27, be transported in the water jacket 23 by intake pipe 30 after the cooling water pressurization, cooling internal combustion engines is finished cool cycles by getting back to water tank by outlet pipe 29.Be provided with fan electromotor 25 on the water tank 24 and be used for cooling.
When internal-combustion engine running of the present invention; two special-shaped pistons 2 in the cylinder 3 are synchronized with the movement in opposite directions; drive camshaft gear wheel 7 synchronous rotaries of connecting rod and valve seat insert gas distribution system; in the four-stroke process of two special-shaped pistons 2; collaborative finish the action of opening air valve air inlet and exhaust, simultaneously, cooling system is higher than the normal value heat radiation that comes into operation at temperature cylinder; and when temperature is low, quit work the protection internal-combustion engine.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. one kind without the horizontal quartastroke engine in cylinder cap double combustion chamber, it is characterized in that, comprise cylinder body (1), special-shaped piston (2), connecting rod, the valve seat insert gas distribution system, a cylinder (3) is arranged in cylinder body (1), two special-shaped pistons (2) head to head are placed in the cylinder (3), the parallel two ends that are assemblied in cylinder body (1) of the bent axle of two connecting rods (32), two special-shaped pistons (2) respectively are connected with the bent axle (32) of cylinder body (1) two ends connecting rod by a connecting rod (4), two valve seat insert gas distribution systems hold on the hole (5) by the valve seat insert that valve seat insert (13) adopts the mode of transition fit processing to be installed on the circumference of cylinder body (1) center, so that dismounting and heat radiation, and installed valve seat pad (33) additional and be used for sealing, connecting rod is provided with crankshaft gear (6), each is connected with a joggle with the camshaft gear wheel (7) of a valve seat insert gas distribution system, the camshaft gear wheel of two valve seat insert gas distribution systems (7) is connected with a joggle togather again, reach two camshaft gear wheels (7) and two crankshaft gears (6) timing synchronously and along the phase counterclockwise rotation, two special-shaped pistons (2) synchronous relative motion in cylinder (3), thereby realize two special-shaped pistons (2), the collaborative four-stroke of finishing of connecting rod and valve seat insert gas distribution system, the firepower bank place of special-shaped piston (2) is processed with four pistion recess (9) and two piston top inclined-planes (10) to dodge the keying of valve seat insert gas distribution system valve (14), and when special-shaped piston (2) runs to the compression stroke top dead center, piston top inclined-plane (10), pistion recess (9) is located the space with valve seat insert (13) and is formed two firing chambers (8) that volume is identical.
2. according to claim 1ly it is characterized in that without the horizontal quartastroke engine in cylinder cap double combustion chamber, one and above cylinder (3) are set in the cylinder body (1), carry out the multi cylinder interlock and improve output power.
3. according to claim 1ly it is characterized in that without the horizontal quartastroke engine in cylinder cap double combustion chamber, be processed with annular groove (11) on the circumference of described special-shaped piston (2) and be used for ring installation.
4. according to claim 1 without the horizontal quartastroke engine in cylinder cap double combustion chamber, it is characterized in that, described valve seat insert gas distribution system can be provided with four groups, four groups of valve seat insert gas distribution systems distribute along the cross-section center line bilateral symmetry of cylinder (3), also are provided with spark plug (12) or diesel oil injection nozzle (31) between the upper two groups of valve seat insert gas distribution systems of cylinder (3).
5. according to claim 1 without the horizontal quartastroke engine in cylinder cap double combustion chamber, it is characterized in that, described camshaft gear wheel (7) and crankshaft gear (6) adopt herringbone tooth or straight-tooth, helical teeth, reduce the end thrust of noise and the rotatingshaft of gear train.
6. each is described without the horizontal quartastroke engine in cylinder cap double combustion chamber to 5 according to claim 1, it is characterized in that, described valve seat insert gas distribution system comprises valve seat insert (13), valve (14), valve collar (15), spring (16), spring seat (17), porting (18), valve rocker (19) and camshaft (20), porting (18) and valve seat insert (13) UNICOM that is installed on the cylinder body (1), valve collar (15) is installed on the valve seat insert (13), valve (14) passes valve seat insert (13) is connected 15 with valve collar) be connected with spring seat (17), valve adjustments nut (21) valve gap adjustment, spring (16) is placed in valve (14) upward and is positioned between valve seat insert (13) and the spring seat (16) and reaches the effect of closing valve for resetting of valve (14), camshaft (20) makes valve rocker (19) open and close valve along pitman arm shaft (22) rotary compression spring (16) by camshaft gear wheel (7) driven rotary.
7. each is described without the horizontal quartastroke engine in cylinder cap double combustion chamber to 6 according to claim 1, it is characterized in that, describedly also be provided with cooling system without the horizontal quartastroke engine in cylinder cap double combustion chamber, be provided with the water jacket (23) of ring-type on the cylindrical shell of cylinder body (1), water tank (24) is connected to by sewer (26) and is connected on the water pump (28) on the thermostat (27), be transported in the water jacket (23) by intake pipe (30) after the cooling water pressurization, cooling internal combustion engines is finished cool cycles by getting back to water tank by outlet pipe (29).
8. according to claim 7ly it is characterized in that without the horizontal quartastroke engine in cylinder cap double combustion chamber, be provided with fan electromotor (25) on the described water tank (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310295660.2A CN103321744B (en) | 2013-07-15 | 2013-07-15 | No-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310295660.2A CN103321744B (en) | 2013-07-15 | 2013-07-15 | No-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine |
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| CN103321744A true CN103321744A (en) | 2013-09-25 |
| CN103321744B CN103321744B (en) | 2015-04-15 |
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| CN201310295660.2A Expired - Fee Related CN103321744B (en) | 2013-07-15 | 2013-07-15 | No-cylinder-cover double-combustion-chamber horizontal type four-stroke internal combustion engine |
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Cited By (12)
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| CN103867297A (en) * | 2014-03-25 | 2014-06-18 | 张珊 | Reciprocating engine |
| CN104454160A (en) * | 2014-05-26 | 2015-03-25 | 董振宝 | Paired opposite type engine |
| CN105041467A (en) * | 2015-06-08 | 2015-11-11 | 张义敏 | Double-crankshaft-offset four-stoke horizontal internal combustion engine without cylinder head |
| JP2018119498A (en) * | 2017-01-26 | 2018-08-02 | 株式会社石川エナジーリサーチ | Opposite piston type engine |
| JP2019090424A (en) * | 2019-03-19 | 2019-06-13 | 株式会社石川エナジーリサーチ | Opposite piston type engine |
| CN110100088A (en) * | 2017-01-02 | 2019-08-06 | 株式会社科伦斯 | Valve module with the operation of improved cylindrical cam |
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| CN111305948A (en) * | 2019-12-13 | 2020-06-19 | 浙江派尼尔科技股份有限公司 | Hand-held type miscella four-stroke micro engine |
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| CN111365122A (en) * | 2018-12-26 | 2020-07-03 | 株式会社石川能源研究 | Piston engine |
| JP2020105919A (en) * | 2018-12-26 | 2020-07-09 | 株式会社石川エナジーリサーチ | Opposed-piston type engine |
| JP2019090424A (en) * | 2019-03-19 | 2019-06-13 | 株式会社石川エナジーリサーチ | Opposite piston type engine |
| CN111305948A (en) * | 2019-12-13 | 2020-06-19 | 浙江派尼尔科技股份有限公司 | Hand-held type miscella four-stroke micro engine |
| JP2020060194A (en) * | 2020-01-17 | 2020-04-16 | 株式会社石川エナジーリサーチ | engine |
| CN112112730A (en) * | 2020-09-22 | 2020-12-22 | 东风汽车集团有限公司 | Movement structure of opposed fuel oil generator and fuel oil engine |
| CN112503923A (en) * | 2020-11-27 | 2021-03-16 | 合肥三伍机械有限公司 | Double-pushing device for grain dryer |
| CN112983637A (en) * | 2021-04-13 | 2021-06-18 | 孙浩 | Multi-volume chamber cycle engine |
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