CN102777248A - Two-stroke diesel engine - Google Patents
Two-stroke diesel engine Download PDFInfo
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- CN102777248A CN102777248A CN2012102716356A CN201210271635A CN102777248A CN 102777248 A CN102777248 A CN 102777248A CN 2012102716356 A CN2012102716356 A CN 2012102716356A CN 201210271635 A CN201210271635 A CN 201210271635A CN 102777248 A CN102777248 A CN 102777248A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The invention relates to a two-stroke diesel engine. The two-stroke diesel engine comprises a cylinder sleeve, an exhaust pipe and a piston and is characterized in that a gas inlet pipe is arranged outside the cylinder sleeve, fresh air with certain pressure exists in the gas inlet pipe, the gas inlet pipe is communicated with a gas inlet on the cylinder sleeve through a gas inlet channel, and a gas inlet valve opening on the gas inlet channel is provided with a gas inlet valve which can open and close the gas inlet valve opening; an exhaust valve is opened and waste gas is exhausted before the piston moves down to a position at which a piston ring is close to the upper edge of the gas inlet; the gas inlet valve is opened, pressing of the fresh air is conducted and the waste gas is discharged further, when the piston continues to move down to the gas inlet and the piston is communicated with the inner cavity of the cylinder sleeve on the upper portion of the piston; and before the piston moves up and the piston ring is close to the upper edge of the gas inlet, the exhaust valve is closed firstly and the gas inlet valve is closed later. The gas inlet valve which is arranged at a position of the gas inlet channel is provided with the gas inlet opening. Even though the piston is far away from the gas inlet during the moving process, no fresh air leaks into a machine cavity on the lower portion through the gas inlet, the piston is not required to be lengthened and can moves a position which is far away from the gas inlet, and the stroke of the piston is increased greatly.
Description
Technical field
The present invention relates to a kind of diesel engine, relate in particular to a kind of two stroke diesel engine.
Background technique
Diesel engine has four-stroke and two stroke diesel engine according to spm, and the two stroke diesel engine in usefulness mainly contains two kinds of structures at present: a kind of is loop scavenging, and another kind is uniflow scavenging.
Loop-scavenged characteristics are apneustic device, and are simple in structure.Like a patent No. is a kind of diesel engine structure the Chinese invention patent " the outlet valve formula two stroke diesel engine of supercharging cross flow scavenging " of ZL02140885.8 (publication number is CN1415846A) has disclosed.But because loop-scavenged structure is that porting has porting in cylinder sleeve cylinder barrel side, a side has been advanced, a side exhaust.This structure can produce part waste gas in the above piston cavity of porting and sweep untotally, and fresh air is not enough, causes the fuel oil consumption to increase.And having got into the energy-conservation epoch now, the diesel engine of this structure has been eliminated by market.
Uniflow scavenged structure is to have inlet hole at cylinder sleeve cylinder barrel downside, and relief opening then is arranged on the cylinder head at cylinder sleeve top.Waste gas is swept very totally during this structure scavenging.Air inlet leans on the certain pressure fresh air that has of inlet box directly to get into cylinder sleeve downside inlet hole.When piston up-down,, there is the air of pressure just all to go out the waste gas in the cylinder sleeve outside the cylinder sleeve through relief opening when piston head is lower than the inlet hole of cylinder sleeve.Reach the purpose of ventilation.Because the air of inlet box has certain pressure during ventilation, this have the air of pressure can only enter the cylinder sleeve chamber like piston top, and in the body chamber below the piston that can not bleed; Otherwise can prevent blast,, move past on the piston and can not make suction port be positioned at the piston below in the journey in addition because the slippage scope of piston receives the restriction of porting; Otherwise can leak gas; Therefore piston can only slippage up and down in small range, and the stroke of piston is short, the inefficiency of diesel engine.
In order to prevent that above-mentioned situation from taking place, diesel engine can adopt following two kinds of structures to realize that a kind of is with cross-type two-stroke diesel diesel engine structure at present, and this structure is exactly to do certain-length to the connection straight-bar that connects piston.Piston be not directly with is connected straight-bar and connects (because connecting rod is connected with bent axle, when moving, connecting rod will be swung, and cannot seal), but be connected with the slide block of vertical motion up and down, slide block in slideway about straight line motion.Connect straight-bar so just along with slide block is made straight line motion up and down; Just straight-bar external diameter cover upper sealing ring can connected; In cylinder sleeve downside upper cylinder body bottom surface, isolated be communicated with the overcoat sealing and fixing of seal ring with machine chamber, bottom, the pressure air of inlet box has not gone with regard to not draining in the downside machine chamber.This structural cost is very high, and the user can only high-end user, and most of user is still with not rising.
Second kind of structure is to elongate piston, and when the supreme initial point of piston stroking upward, the piston lower end is lengthened to the cylinder sleeve suction port with upper/lower positions; That is to say; When piston stroking upward to top, the cylinder sleeve suction port is sealed in the piston bottom, can not let pressure air bleed in the machine chamber; And for sealing pressure air, must be with two roads with upper piston ring.Such harm is: the first, if the design long stroke diesel engine the time, piston is very long.The second, because itself there is piston ring the piston upper end, and piston ring is arranged in the lower end, resistance just increases during piston up-down, and oil consumption is just very high, and wearing and tearing increase.The actual use do not have Economy.
All there is certain defective in aforementioned several kinds of two stroke diesel engines, also can do further improvement.
Summary of the invention
Technical problem to be solved by this invention is to above-mentioned existing technology present situation a kind of reasonable in design to be provided, need not to change the two stroke diesel engine that piston length also can make piston stroke lengthening, and this diesel engine also has the advantage fuel-efficient, that cost is low.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: a kind of two stroke diesel engine; Comprise frame, cylinder sleeve, outlet pipe, be provided with the piston that can move up and down in the cylinder sleeve, piston links to each other with bent axle through connecting rod; Bent axle is positioned at the machine chamber of frame lower; The periphery on piston top is provided with piston ring, has suction port on the bottom perisporium of cylinder sleeve, and the cylinder cap at cylinder sleeve top is provided with relief opening; Said outlet pipe is communicated with the cylinder sleeve inner chamber through relief opening, and said relief opening is provided with the outlet valve that can open and close relief opening; It is characterized in that: the outside of said cylinder sleeve is provided with the suction tude of the fresh air that has certain pressure in it; This suction tude is communicated with suction port on the cylinder sleeve through gas-entered passageway, and the intake valve port place with the suction tude conducting on the said gas-entered passageway is provided with the suction valve that can open and close intake valve port; Piston be displaced downwardly to piston ring near said suction port upper edge before, said outlet valve is opened waste discharge gas; When piston continued to be displaced downwardly to suction port and communicates with the cylinder sleeve inner chamber on piston top, said INO was by the further punching press combustion gas of fresh air; Move on the piston piston ring near said suction port upper edge before, said outlet valve is closed earlier, then suction valve cuts out, and gets into the pressurized air process.
Get in the cylinder sleeve inner chamber on piston top for there is more fresh air in guarantor unit in the time, above-mentioned suction port has a plurality of, arranges that along the circle spacing said gas-entered passageway is in the form of a ring to coat said a plurality of suction port.Fresh air is got over multipotency and is guaranteed that the oil inflame in the piston cavity is more abundant.
Above-mentioned suction valve is by the intake cam mechanism controls; Said intake cam mechanism comprises the intake cam by the camshaft driven rotary; Intake cam is positioned at camshaft case; Said suction valve is held and the intake valve port trend that keeps shut by first spring, and the periphery of said intake cam then directly or indirectly contacts with the end face of the bar portion of suction valve.This suction valve drives through mechanical structure and opens, and it has the simple advantage of control mode.
Certainly suction valve also can have solenoid valve to control, and the electrical signal of solenoid valve then has the angle of crankshaft rotating to provide, and carries out whether open intake valve port by solenoid valve then, when bent axle turns over this angle, and the solenoid valve outage, intake valve port is closed.
Suction valve also can be controlled by hydraulic structure; Hydraulic structure comprises oil hydraulic cylinder, and the plunger in the oil hydraulic cylinder is connected with the top of the bar portion of suction valve, is positioned at the external oil pump of cylinder body of the oil hydraulic cylinder of plunger top; The cylinder body that is positioned at the oil hydraulic cylinder of plunger below is provided with pressurized air; The suction valve intake valve port trend that under compressed-air actuated effect, keeps shut is in hydraulic oil is pressed into the cylinder space of plunger upper part, with active force during greater than the bottom compressed air pressure; Plunger drive suction valve moves down opens intake valve port; When hydraulic oil release, suction valve cuts out intake valve port under compressed-air actuated effect, and the signal that hydraulic oil is pressed into is provided by the angle of swing of the cam of camshaft or bent axle.
Compressed-air actuated effect in this hydraulic structure is equivalent to the effect of spring, and compressed-air actuated pressure keeps substantially constant.
Being pressed into of hydraulic oil can be pumped into high pressure oil in the valve oil cylinder by the cam drive oil pump, subdues valve (backing down), and the opening time is provided by cam.
Being pressed into of hydraulic oil can also be that the oil pump of machine band oil pump or driven by motor pumps into high pressure oil in the fuel reserve tank, connects valve oil cylinder, opens solenoid valve through solenoid valve; Subdue valve; Close solenoid valve, valve returns, and the open and close time provides signal by the crankshaft rotating angle.
Be rotatably connected to the first guiding rocking arm that can swing up and down on the madial wall of above-mentioned camshaft case; The upper surface of the first guiding rocking arm is rotatably connected to can be around first guide roller of self axis rotation; Said first guide roller directly contacts with the periphery of intake cam, and the lower surface of the first guiding rocking arm then directly contacts with the end face of the bar portion of suction valve.
If directly intake cam is contacted with the bar portion of suction valve; Intake cam can produce a cross component force to the bar portion of suction valve in rotation process; Intake cam collides the side direction of suction valve for a long time can influence the sealing between suction valve and the intake valve port; And this structure intake cam contacts with the bar portion of suction valve through the first guiding rocking arm and first guide roller, and the lateral force of intake cam then acts on and the first guiding rocking arm like this, can not produce lateral force to suction valve.
Above-mentioned outlet valve opens and closes relief opening by the exhaust cam mechanism controls; Said exhaust cam mechanism comprises the exhaust cam by the camshaft driven rotary, and rocking arm and push rod, and said exhaust cam is positioned at camshaft case; Said outlet valve is held and the relief opening trend that keeps shut by second spring; Said push rod is located on the camshaft case and with said exhaust cam and directly or indirectly contacts, and push rod can move up and down under the effect of exhaust cam, and the middle part of said rocking arm is rotatably connected on the support that is positioned on the cylinder cap; first end of rocking arm contacts with the end face of the bar portion of outlet valve, and second end of rocking arm then contacts with the end face of push rod.This is mechanical exhaust structure, and it has the simple advantage of control mode.Certainly outlet valve also can adopt hydraulic pressure or electromagnetic valve structure.Can be with reference to the control structure of suction valve.
Be rotatably connected to the second guiding rocking arm that can swing up and down on the madial wall of above-mentioned camshaft case; The lower surface of the second guiding rocking arm is rotatably connected to can be around second guide roller of self axis rotation, and the upper surface of the second guiding rocking arm then directly contacts with the bottom surface of said push rod.
If directly exhaust cam is contacted with push rod; Exhaust cam can produce a cross component force to push rod in rotation process; Exhaust cam collides the skew that contacts that can influence between pin and the rocking arm to the side direction of push rod for a long time, thereby influences the unlatching of outlet valve, and this structure exhaust cam passes through second lead rocking arm and second guide roller and contacts with push rod; The lateral force of exhaust cam then acts on and the second guiding rocking arm like this, can not produce lateral force to push rod.
Because under the state that moves on the piston away from suction port; Though suction valve cuts out; But the gas of remaining certain pressure can though the amount of each gas seldom, can be put aside a large amount of pressed gas in the course of time in the gas-entered passageway in the machine chamber through suction port row in frame downside machine chamber; Thereby influence the diesel engine proper functioning, so we are provided with the gas outlet that can the inner residual pressure gas in machine chamber be discharged on the sidewall of the machine chamber of above-mentioned frame lower.Gas outlet can be discharged gas remaining in the machine chamber, remains and has only an atmospheric pressure in the machine chamber.
For preventing that the oil gas in the machine chamber from running out of with gas outlet, above-mentioned gas outlet outside also is coated with cooling unit.This cooling unit can reach the purpose of fuel-economizing with the oil gas cooling for reflux that overflows with gas in the machine chamber.
Also comprise air inlet turbocharger and exhaust-gas turbocharger; Transmission shaft in said air inlet turbocharger and the exhaust-gas turbocharger is same; Wherein, air inlet turbocharger is communicated with an end of said suction tude through air cooling device, connecting tube successively, and exhaust-gas turbocharger is communicated with outlet pipe so that drive the transmission shaft rotation in the exhaust-gas turbocharger through the waste gas that outlet pipe is discharged; The rotation of this transmission shaft drives air inlet turbocharger work simultaneously; Said suction tude is provided the fresh air of certain pressure, the other end of said suction tude is provided with blower, when starting, suction tude provided the fresh air of initial certain pressure.More than for a kind of mode that pressurized air is provided, pressurized air also can adopt two kinds of waste gas supercharging and scavenging pumps certainly, and scavenging pump can be divided into machine band and electronic two kinds.
The power of this air inlet turbocharger drives exhaust-gas turbocharger work by waste gas and provides, and need not extra power and feeds the air turbine pressurized machine power is provided, and makes this diesel engine more fuel-efficient, energy-conservation.
The outer end of above-mentioned bent axle is provided with camshaft sprocket, and the outer end of said camshaft is provided with crankshaft sprocket, links together through Transmitted chains between said camshaft sprocket and the crankshaft sprocket.Diesel engine is exactly the mechanical energy that the diesel oil chemical energy is converted to crankshaft rotating, and the power that the camshaft of control suction valve and exhaust valve opening rotates in this structure directly has bent axle to provide, and need not extra power provides, and has more Economy.Also available gear transmission structure of camshaft and bent axle are in transmission connection.
Compared with prior art, the invention has the advantages that: the suction port of cylinder sleeve sidewall is not to cover through piston, but provides through the suction valve that is arranged on the gas-entered passageway place; Even like this in the piston moving process away from suction port, suction port does not have fresh air yet and drains in the machine chamber, bottom, just because of suction port does not need piston seal yet; Therefore piston need not extra lengthening, also is movable to the position away from suction port, the stroke of the piston that extended greatly; Can get into abundant fresh air in the piston cavity; Guarantee that diesel oil can be promoted the working efficiency of diesel engine by fully burning, also have piston also to need not piston ring to be set in addition again and get into the machine chamber to play the air that prevents pressure in lower part of piston; Resistance when the minimizing of piston ring can reduce piston up-down in the piston; Also just reduce oil consumption, and the minimizing of piston ring can also reduce the replacing user cost of piston ring, have more Economy.Therefore, our two stroke diesel engine of invention was both fuel-efficient, and the cost cost is low again, was the direction of user's selection from now on, also was the diesel engine development direction.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the A place enlarged view of Fig. 1;
Fig. 3 is the B place enlarged view of Fig. 1;
Fig. 4 is the front schematic view of the embodiment of the invention;
Fig. 5 is the side view of the embodiment of the invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Shown in Fig. 1～5, be a preferred embodiment of the present invention.
A kind of two stroke diesel engine comprises frame 33, cylinder sleeve 1, cylinder cap 12, outlet pipe 2, bent axle 4, oil gun 28, fuel valve 29, high pressure oil pump 30 etc.Wherein, be provided with the piston 3 that can move up and down in the cylinder sleeve, piston 3 links to each other with bent axle 4 through connecting rod 31; Bent axle 4 is positioned at the machine chamber 34 of frame lower; The periphery on piston 3 tops is provided with piston ring 32, and piston ring 32 has four roads in the present embodiment, and certainly piston ring 32 also can multiple tracks; Simultaneously upper track piston ring and descend spacing between the road piston ring greater than the height of following suction port 11 most, the lubricated of piston ring 32 has oil gun 28 to provide.The cylinder cap 12 at cylinder sleeve top is provided with relief opening 13; And make the fuel valve 29 of fuel-oil atmozation; 29 of fuel valves pass through high pressure oil pump 30 fuel feeding; If the cam structure that the startup of high pressure oil pump 30 also is arranged on the camshaft is controlled, the oil nozzle of fuel valve 29 inner chamber to cylinder sleeve under the state that moves past upper dead center on the piston 3 carries out oil spout, has suction port 11 on the bottom perisporium of cylinder sleeve 1; Outlet pipe 2 is communicated with cylinder sleeve 1 inner chamber through relief opening 13, and relief opening 13 is provided with the outlet valve 5 that can open and close relief opening.Also being provided with the frame access cover 36 of conveniently installing and overhauling that can open on the frame 33, also being provided with the convenient cylinder sleeve access cover 37 of installing and overhauling piston that can open on the cylinder sleeve 1, more than is the conventional structure of two stroke diesel engine.
The outside of cylinder sleeve 1 is provided with the suction tude 6 of the fresh air that has certain pressure in it; This suction tude 6 is communicated with suction port 11 on the cylinder sleeve through gas-entered passageway 7; Suction port 11 in the present embodiment has a plurality of, arranges that along the circle spacing gas-entered passageway 7 is in the form of a ring to coat a plurality of suction ports 11.
Like Fig. 1, shown in 2, on the gas-entered passageway 7 be provided with the suction valve 8 that can open and close intake valve port 71 with intake valve port 71 places suction tude 6 conductings; Suction valve 8 opens and closes intake valve port by the intake cam mechanism controls in the present embodiment; Intake cam mechanism comprises the intake cam 10 by camshaft 9 driven rotary; Intake cam 10 is positioned at camshaft case 14; Suction valve 8 is held and intake valve port 71 trend that keep shut by first spring 81, the periphery of intake cam 10 then with the end face mediate contact of the bar portion of suction valve 8.Be rotatably connected to the first guiding rocking arm 15 that can swing up and down on the madial wall of camshaft case 14; The upper surface of the first guiding rocking arm 15 is rotatably connected to can be around first guide roller 16 of self axis rotation; First guide roller 16 directly contacts with the periphery of intake cam 10, and the lower surface of the first guiding rocking arm 15 then directly contacts with the end face of the bar portion of suction valve 8.
Because under the state that moves on the piston 3 away from suction port 11; Though suction valve 8 cuts out; But the gas of remaining certain pressure can though the amount of each gas seldom, can be put aside a large amount of pressed gas in the course of time in the gas-entered passageway 7 in the machine chamber through suction port 11 rows in frame 33 downside machine chambeies 34; Thereby influence the diesel engine proper functioning, therefore on 34 sidewalls of the machine chamber of frame 33 bottoms, being provided with can be with the gas outlet 35 of machine chamber 34 inner residual pressure gases discharges.Gas outlet 35 can be discharged gas remaining in the machine chamber 34, remains and has only an atmospheric pressure in the machine chamber.Gas outlet 35 outsides also are coated with cooling unit 351.This cooling unit 351 can reach the purpose of fuel-economizing with the oil gas cooling for reflux that overflows with gas in the machine chamber.
Like Fig. 1, shown in 3, outlet valve 5 opens and closes relief opening by the exhaust cam mechanism controls, and exhaust cam mechanism comprises the exhaust cam 17 by camshaft 9 driven rotary; And rocking arm 18 and push rod 19; Exhaust cam 17 is positioned at camshaft case 14, and outlet valve 5 is held and relief opening 13 trend that keep shut by second spring 51, push rod 19 be located on the camshaft case 14 and with exhaust cam 17 mediate contacts; Push rod 19 can move up and down under the effect of exhaust cam 17; middle part of rocking arm 18 is rotatably connected on the support 20 that is positioned on the cylinder cap 12, and first end of rocking arm 18 contacts with the end face of the bar portion of outlet valve 5, and second end of rocking arm 18 then contacts with the end face of push rod 19.Be rotatably connected to the second guiding rocking arm 21 that can swing up and down on the madial wall of camshaft case 14; The lower surface of the second guiding rocking arm 21 is rotatably connected to the upper surface that can lead rocking arms 21 around second guide roller 22, the second that self axis rotates and then directly contacts with the bottom surface of push rod 19.
As shown in Figure 5, the outer end of bent axle 4 is provided with crankshaft sprocket 41, and the outer end of camshaft 9 is provided with camshaft sprocket 91, links together through Transmitted chains 27 between crankshaft sprocket 41 and the camshaft sprocket 91.
Piston 3 be displaced downwardly to piston ring 32 near suction port 11 upper edges before, outlet valve 5 is opened waste discharge gas; When piston 3 continued to be displaced downwardly to suction port 11 and communicates with the cylinder sleeve inner chamber on piston 3 tops, suction valve 8 was opened and is let the further punching press combustion gas of fresh air; Move on the piston 3 piston ring 32 near suction port 11 upper edges before, outlet valve 5 is closed earlier, then suction valve 8 cuts out, and gets into the pressurized air process.
Also comprise air inlet turbocharger 23 and exhaust-gas turbocharger 24; Transmission shaft in air inlet turbocharger 23 and the exhaust-gas turbocharger 24 is same; Wherein, Air inlet turbocharger 23 is communicated with an end of suction tude 6 through air cooling device 231, connecting tube 25 successively; Exhaust-gas turbocharger 24 is communicated with outlet pipe 2 so that the waste gas of discharging through outlet pipe 2 drives the transmission shaft rotation in the exhaust-gas turbocharger 24, and the rotation of this transmission shaft drives air inlet turbocharger 23 work simultaneously, suction tude 6 is provided the fresh air of certain pressure; The other end of suction tude 6 is provided with blower 26, when starting, suction tude 6 provided the fresh air of initial certain pressure.
The working principle and the process of this two stroke diesel engine are following:
First stroke, piston 3 move to top dead center from lower dead center.
When piston is in lower dead center; Outlet valve 5 is early opened with suction valve 8; The pressurized air of certain pressure just gets in the cylinder sleeve 1 in the suction tude 6, and rushes at outlet valve 5 and let the further punching press combustion gas of fresh air, also makes simultaneously in the cylinder sleeve inner chamber on piston 3 tops to be full of the fresh air that pressure is arranged; Move on the piston 3, move on the piston 3 piston ring 32 near suction port 11 upper edges before, outlet valve 5 is closed earlier; Then suction valve 8 cuts out; At least to guarantee when suction valve 8 cuts out to descend the road piston ring to be positioned at the below of the lower edge of suction port 11 most, move on piston 3 continues, get into the pressurized air process.
Second stroke, piston 3 move to lower dead center from top dead center.
Piston 3 walks to crosses atdc slightly, and high pressure oil pump 30 starts fuel feeding valve 29 is carried out fuel feeding, and the oil nozzle of fuel valve 29 carries out oil spout to the inner chamber of cylinder sleeve 1; The high temperature that pressurized air produced; Light the fuel oil of atomizing at once, the pressure that burning is produced promotes piston 3 descending actings; Piston 3 be displaced downwardly to piston ring 32 near suction port 11 upper edges before; Outlet valve 5 is opened waste discharge gas, and when piston 3 continued to be displaced downwardly to suction port 11 and communicates with the cylinder sleeve inner chamber on piston 3 tops, suction valve 8 was opened once more and let the further impact extrusion pressure of fresh air go out waste gas.
Bent axle is whenever goed around, and piston has been walked two strokes and just accomplished a circulation.
The suction port 11 of cylinder sleeve 1 sidewall is not to cover through piston 3, but stops that through the suction valve 8 that is arranged on gas-entered passageway 7 places the fresh air of certain pressure gets into the machine chamber, though like this in piston 3 moving process away from suction port 11; Suction port 11 does not have the fresh air with certain pressure yet and drains in the machine chamber, just because of suction port 11 does not need piston 3 sealings, so piston 3 need not extra lengthening; Also be movable to position away from suction port; Extended the greatly stroke of piston 3 can get into abundant fresh air in the piston cavity, guarantees that diesel oil can be by fully burning; Promote the working efficiency of diesel engine; Also have piston 3 also to need not in the bottom of piston 3 piston ring 32 to be set in addition again and get into the machine chamber to play the air that prevents pressure, the resistance the when minimizing of piston ring 32 can reduce piston up-down in the piston also just reduces oil consumption; And the minimizing of piston ring 32 can also reduce the replacing user cost of piston ring, has more Economy.Therefore, our two stroke diesel engine of invention was both fuel-efficient, and the cost cost is low again, was the direction of user's selection from now on, also was the diesel engine development direction.
Claims (10)
1. two stroke diesel engine; Comprise frame (33), cylinder sleeve (1), outlet pipe (2), be provided with the piston (3) that can move up and down in the cylinder sleeve, piston (3) links to each other with bent axle (4) through connecting rod (31); Said bent axle (4) is positioned at the machine chamber (34) of frame downside; The periphery on piston (3) top is provided with piston ring (32), has suction port (11) on the bottom perisporium of cylinder sleeve (1), and the cylinder cap at cylinder sleeve top (12) is provided with relief opening (13); Said outlet pipe (2) is communicated with cylinder sleeve (1) inner chamber through relief opening (13), and said relief opening (13) is provided with the outlet valve (5) that can open and close relief opening; It is characterized in that: the outside of said cylinder sleeve (1) is provided with the suction tude (6) of the fresh air that has certain pressure in it; This suction tude (6) is communicated with suction port (11) on the cylinder sleeve through gas-entered passageway (7), on the said gas-entered passageway (7) and the intake valve port (71) of suction tude (6) conducting locate to be provided with the suction valve (8) that can open and close intake valve port (71); Piston (3) be displaced downwardly to piston ring (32) near said suction port (11) upper edge before, said outlet valve (5) is opened waste discharge gas; When piston (3) continued to be displaced downwardly to suction port (11) and communicates with the cylinder sleeve inner chamber on piston (3) top, said suction valve (8) was opened and is let the further punching press combustion gas of fresh air of pressure; Move on the piston (3) piston ring (32) near said suction port (11) upper edge before, said outlet valve (5) is closed earlier, then suction valve (8) cuts out, and gets into the pressurized air process.
2. two stroke diesel engine according to claim 1 is characterized in that: said suction port (11) has a plurality of, arranges that along the circle spacing said gas-entered passageway (7) is in the form of a ring to coat said a plurality of suction port (11).
3. two stroke diesel engine according to claim 1; It is characterized in that: said suction valve (8) is by the intake cam mechanism controls; Said intake cam mechanism comprises the intake cam (10) by camshaft (9) driven rotary; Intake cam (10) is positioned at camshaft case (14), and said suction valve (8) is held and the intake valve port that keeps shut (71) trend by first spring (81), and the periphery of said intake cam (10) then directly or indirectly contacts with the end face of the bar portion of suction valve (8).
4. two stroke diesel engine according to claim 3; It is characterized in that: be rotatably connected to the first guiding rocking arm (15) that can swing up and down on the madial wall of said camshaft case (14); The upper surface of the first guiding rocking arm (15) is rotatably connected to can be around first guide roller (16) of self axis rotation; Said first guide roller (16) directly contacts with the periphery of intake cam (10), and the lower surface of the first guiding rocking arm (15) then directly contacts with the end face of the bar portion of suction valve (8).
5. two stroke diesel engine according to claim 1; It is characterized in that: said suction valve also can have solenoid valve to control; The electrical signal of solenoid valve then has the angle of crankshaft rotating to provide, and carries out whether open intake valve port by solenoid valve then, when bent axle turns over this angle; The solenoid valve outage, intake valve port is closed.
6. two stroke diesel engine according to claim 1 is characterized in that: said suction valve (8) is by hydraulic structure control, and hydraulic structure comprises oil hydraulic cylinder; Plunger in the oil hydraulic cylinder is connected with the top of the bar portion of suction valve (8); Be positioned at the external oil pump of cylinder body of the oil hydraulic cylinder of plunger top, the cylinder body that is positioned at the oil hydraulic cylinder of plunger below is provided with pressurized air, suction valve (8) intake valve port (71) trend that under compressed-air actuated effect, keeps shut; In hydraulic oil is pressed into the cylinder space of plunger upper part; With active force during greater than the bottom compressed air pressure, plunger drives suction valve (8) and moves down and opens intake valve port (71), when hydraulic oil discharges; Suction valve (8) cuts out intake valve port (71) under compressed-air actuated effect, the signal that hydraulic oil is pressed into is provided by the angle of swing of the cam of camshaft or bent axle.
7. two stroke diesel engine according to claim 1; It is characterized in that: said outlet valve (5) opens and closes relief opening by the exhaust cam mechanism controls; Said exhaust cam mechanism comprises the exhaust cam (17) by camshaft (9) driven rotary, and rocking arm (18) and push rod (19), and said exhaust cam (17) is positioned at camshaft case (14); Said outlet valve (5) is held and the relief opening that keeps shut (13) trend by second spring (51); Said push rod (19) be located in that camshaft case (14) is gone up and with said exhaust cam (17) mediate contact, push rod (19) can move up and down under the effect of exhaust cam (17), the middle part of said rocking arm (18) is rotatably connected on the support (20) that is positioned on the cylinder cap (12); first end of rocking arm (18) contacts with the end face of the bar portion of outlet valve (5), second end of rocking arm (18) then contacts with the end face of push rod (19); Be rotatably connected to the second guiding rocking arm (21) that can swing up and down on the madial wall of said camshaft case (14); The lower surface of the second guiding rocking arm (21) is rotatably connected to can be around second guide roller (22) of self axis rotation, and the upper surface of the second guiding rocking arm (21) then directly contacts with the bottom surface of said push rod (19).
8. two stroke diesel engine according to claim 1 is characterized in that: machine chamber (34) sidewall of said frame (33) bottom is provided with can be with the gas outlet (35) of machine chamber (34) inner residual pressure gas discharge.
9. two stroke diesel engine according to claim 8 is characterized in that: said gas outlet (35) outside also is coated with cooling unit (351).
10. according to the described two stroke diesel engine of arbitrary claim in the claim 1～9; It is characterized in that: also comprise air inlet turbocharger (23) and exhaust-gas turbocharger (24); Transmission shaft in said air inlet turbocharger (23) and the exhaust-gas turbocharger (24) is same; Wherein, Said air inlet turbocharger (23) is communicated with an end of said suction tude (6) through air cooling device (231), connecting tube (25) successively; Said exhaust-gas turbocharger (24) then is communicated with outlet pipe (2) so that the transmission shaft that drives in the exhaust-gas turbocharger (24) through the waste gas that outlet pipe (2) is discharged rotates, and the rotation of this transmission shaft drives air inlet turbocharger (23) work simultaneously, said suction tude (6) is provided the fresh air of certain pressure; The other end of said suction tude (6) is provided with blower (26), when starting, suction tude (6) provided the fresh air of initial certain pressure.
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Cited By (3)
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| CN106523131A (en) * | 2016-11-10 | 2017-03-22 | 宁波市鄞州煜隆工具有限公司 | Two-stroke internal combustion engine |
| CN113513424A (en) * | 2021-04-28 | 2021-10-19 | 广西玉柴机器股份有限公司 | Two-stroke diesel engine and air intake method thereof |
| CN113513402A (en) * | 2021-04-28 | 2021-10-19 | 广西玉柴机器股份有限公司 | Novel two-stroke multi-cylinder diesel engine scavenging device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101634546B1 (en) | 2015-10-05 | 2016-06-29 | 주식회사 현대케피코 | Apparatus for controlling electronic continuously variable valve timing and method thereof |
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| CN102777248B (en) | 2014-06-04 |
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