CN110344938A

CN110344938A - A kind of further improved engine

Info

Publication number: CN110344938A
Application number: CN201910637994.0A
Authority: CN
Inventors: 叶晓波; 其他发明人请求不公开姓名
Original assignee: Ningbo Daye Garden Equipment Co Ltd
Current assignee: Ningbo Daye Garden Equipment Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2019-10-18

Abstract

A kind of further improved engine, exhaust outlet connection catalyst hush tube (69) of cylinder and function hush tube (54d), tubule, fish scale wedge (54e), variable cross-section air hose (54f) noise reduction for assisting hush tube (54g)；The function hush tube (54d) is the series winding at interval, and is axis along the curve of the range of decrease of the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period；In the entrance of the piston pin end of engine piston, should not the chamfering (d18) of common pin hole be mounted directly two G type elastic cushions.

Description

A kind of further improved engine

Technical field

The present invention provides one kind and cuts off shrub for the places such as beside flower bed, garden, park and road, and flowers and trees shaping is cut Filling machine band grass-mowing machine, belongs to gardens machine field.With the innovative approach by being discharged indirectly after one meter five of catalase hush tube, to expand Purposes on brush cutter installs band additional and cuts pile and beats the grass four bifurcated of the moving head of wire and the disc cutterbar with inside and outside sawtooth and controlization device Nozzle, and convenient for the long grass pressing wheel of pressure grass soil moisture conservation and meadow decorative pattern, to form low emission LPG brush cutter.There is the burning of function wave Room and with the collocation that has the internal combustion engine ignition device of active receiving electrode and fine motion discharge electrode, have and add double auxiliary skirt rims in piston skirt It reduces hydrocarbon emission and piston skirt logarithmic differentiation isogonal line skirt turbulent flow returns and alters drop row, there is narrowed left and right block Double auxiliary blow vents reduce a variety of methods of discharge, the two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise It is the engine of low emission, is the crystallization that the present inventor's lifetime domestic and foreign experience is groped；Known two rush petrol engine discharge hardly possible It is up to standard, it is existing can be up to standard, had determined that in the application that two rush gasoline engine scavenging road junction and start batch to produce a kind of further improved hair Motivation implies the new technical field of the low emission of 20 years low-discharge two-stroke engines from now on.

Background technique

Brush cutter is widely used in the places such as flower bed, garden, park and road side and cuts the grass on a lawn, tending ot young growth, tea Garden updates, and herbage harvesting is returned crop stocks to the field, flowers and trees shaping etc. cuts off the operation of shrub branch；It is selected by the hobby of people Mode carrys out brush.Some operation pedestrians like and when habit brush cutter, when especially encountering corner place, use energetically Press mobile jib, do mobile jib often position and does not live and micro wave calmly.The height for operating pedestrian is different, and habit takes work The difference for making angle, needs mobile jib adjustable length, and the round type linkage of original positioning mobile jib, causes mobile jib micro there are easy The shortcoming rocked.The low vibration and low noise of low vibration grass-mowing machine, if considering to have in the foamed plastics of stock plus-minus vibration Certain curative effect；And the very big root of vibration and noise is not only in the precision and geometric tolerance of power and tool, and is mechanism, The harmony of catalyst, hush tube, vibration-damped handle, cutter and engine cooperates, and low vibration and the low emission for pursuing grass-mowing machine are true On be the hard nut to crack left for a long time.Power per liter can be improved relative to four-stroke engine using two stroke engine 50% or more, but be that true hardly possible is up to standard in discharge, this is a part of project of the invention；Grass-mowing machine is portable dam, it is desirable to Power is light and small；No matter two-stroke or four-stroke gasoline engine will igniter, engine spark plug is widely used in arteries and veins Current voltage of leaping high is introduced into combustion chamber, makes the gaseous mixture sparking of inspiration cylinder and lights, and then diffusion combustion and breaks out work done. Between the external connector of existing spark plug and the spark cap for having rubber jar, has sometimes and loosely dissipate scattered phenomenon.Existing fire The inside of Hua Sai, though being equipped with glass-sealing agent makees resistance, only impedance；If adding induction reactance and capacitive reactance, forms suitable RCL and return Road, there will be the effects for more preferably inhibiting radio interference.Multiple tracks umbrella rib on insulator can also be improved by semi-circular cross-section For saw-tooth shaped cross section, climbs electric channel more to insulate and preferably block rubber jar.The metal shell of existing spark plug Heat dissipation also can further improve.The electrode of existing spark plug, as one can imagine, there are easy coking, easy ablation, single-point arcing, low temperature The shortcomings that difficult point；If electrode innovation be it is movable, when there is improvement.It is but not perfect moreover there are many original combustion chambers Ten beauty；In addition to crossing advantage, there is shortcoming；Such as wedge-section combustion chamber, gaseous mixture undue concentration at spark plug, operating condition Seem rough；For another example bathtub shaped combustion chamber, the shape of prolate, making squish, the effect is relatively poor, flame travel Longer, burn rate is relatively low, and burning time is long, and rate of explosion is low, and surface to volume ratio F/V is larger, is unfavorable to HC discharge. For another example bowl-in-piston chamber, hemispherical combustion chamber, fluffy shape combustion chamber and other types combustion chamber such as generate the auxiliary combustion of turbulent flow Room, dual ignition plug combustion chamber, the combustion chamber of plane is each has something to recommend him；But the invention that the mankind aspire after perfection is endless, piston Also there are very big potentiality that can dig.The so-called best geometry of combustion chamber and piston is no doubt important, but to be adapted to engine model And arrange in pairs or groups with igniter, just there is preferable effect.Especially fuel economy of the two-stroke gasoline engine than four-stroke gasoline engine It is worse, the hydrocarbon emission Chang Chaobiao in tail gas.Combustion chambers of internal combustion engines and piston and collocation with igniter, are one It is related to the hard nut to crack of energy-saving and emission-reduction.It contributes if with four-stroke engine less；Volume is big if with booster；If using bavin Then easy soiled is personal for oil turbine；By the exhaust gas of the engine direct emission by person of modern times, hover in engine environment, portion It can be sucked by engine air filter and carburetor air mouth, and portion can be sucked by people.Brush cutter can only brush and cannot It beats the grass；It can dual-use if installing moving head additional on cutter head；The meadow just beaten, some grass have the phenomenon for being pulled out pine, if With grass pressing wheel, not only there is the soil moisture conservation of pressure grass and extrude the effect of meadow decorative pattern, and makes smooth operation and laborsaving；Common flat sword Bush knife encounters stiff wood bar and just allows knife phenomenon sometimes, if with band part sawtooth since the effect of sliding cutting is more than the effect of impact cutting Knife can improve；It is long to cut pile wire service life of beating the grass；If can be advanced optimized with the improvement of four bifurcated nozzle of carburetor into vapour； It is a kind of noise reduction and the engine for reequiping G pad low emission level engine improvement, easily makes brush cutter and grass-mowing machine up to standard.

Summary of the invention

In order to make up shortcoming caused by the existing mechanism of grass-mowing machine, keep mobile jib positioning reliable and it is not micro wave, make brush The low vibration and low noise of machine are improved, and power output and cutting effect are improved, and lower discharge, and the present inventor has done many brush The improvement of machine grass-mowing machine, with containing the single-cylinder air-cooled petrol engine of small two-stroke for improving more scavenging ports, such as E134F is former long Bar is changed to the hush tube of more honeycombs and catalyst, there is transparent shield, has the bush knife of periphery blade and inner circumferential blade, there is side The steady stock interface of flange and lateral filament button, there is the hand handle of spiral spring or wave spring and vibration damping, there is inside spin whirlpool nozzle Carburetor, formed it is novel there is catalase hush tube and swirl sprayer and two to rush the brush cutter of more scavenging port gasoline engines, be a kind of Low-emission gasoline brush cutter.Brush cutter can only brush and cannot beat the grass；It can dual-use if installing moving head additional on cutter head； The meadow just beaten, some grass have the phenomenon for being pulled out pine, if not only having the soil moisture conservation of pressure grass with grass pressing wheel and extruding the effect of meadow decorative pattern Fruit, and make smooth operation and laborsaving；The bush knife of common flat sword is encountered since the effect of sliding cutting is more than the effect of impact cutting Stiff wood bar just allows knife phenomenon sometimes, if can be improved with the knife of band part sawtooth；It is long to cut pile wire service life of beating the grass；If with changing The improvement of oily four bifurcated nozzle of device can be advanced optimized into vapour；And known two to rush petrol engine discharge difficult up to standard, finds use on Piston skirt, which adds double auxiliary skirt rims and returns in scavenging road junction inclined wedge turbulent flow, alters the low emission two of piece and rushes petrol engine, when can be into one Step improves and keeps brush cutter and grass-mowing machine up to standard.Therefore to expand purposes, on the basis of Low-emission gasoline brush cutter, installation is beaten the grass Head, grass pressing wheel, band serrated knife cut pile and beat the grass the improvement of four bifurcated nozzle of wire and carburetor, form Low-emission gasoline and cut Filling machine.The engine of low emission, be the improvement of internal combustion engine the combustion chamber for having function wave and with have active receiving electrode and fine motion On the basis of the collocation of the internal combustion engine ignition device of discharge electrode, and adds double auxiliary skirt rims to reduce hydrocarbon in piston skirt and arrange On the basis of the petrol engine put, and the vapour for altering drop row is returned in improved piston skirt logarithmic differentiation isogonal line skirt turbulent flow On the basis of oil turbine, double auxiliary blow vents of further improved narrowed left and right block reduce the two of discharge and rush petrol engine, Belong to the combustion chamber of internal combustion engine and the technical field of turbulent scavenging.In piston skirt plus double auxiliary skirt rims and in scavenging road junction inclined wedge Petrol engine is rushed in the low emission two that turbulent flow time alters piece, is the crystallization for collecting many years domestic and foreign experience and groping；Its usefulness is to take Unexpected emission reduction effect up to standard was obtained, and brush grass-mowing machine is dual-purpose.

Silkworm in spring not to the utmost, improves invention and has no limits to dead silk；It wears out iron shoes and on a rare occasion obtains, clino-diagonal is warded off in energy-saving and emission-reduction.Everybody knows Two rush machine discharge Chang Chaobiao, but nobody can thoroughly solve；The scavenging road junction inclined wedge turbulent flow returns and alters piece, is sweeping in two qi of chong channel ascending adversely cylinders Gas port adds small pieces, seems simple, but nobody can find out；It is one small to be who fails to give attention to go to burn-on at the scavenging road junction of cylinder Piece, which is loaded on, starts the engine and contacts with high speed piston, but the sudden caprice for often having an examination in arms just has amazing effect, What this, this is not invented exactly? this be both after travelling far and wide in search of it, thousand consider and it is even have one, and be for many years to grope and state The crystallization of inside and outside experience has received emission reduction effect up to standard really.Moreover the carburetor of engine has the potential to be tapped very much, if four points Fork nozzle refers to that on the outlet of the nozzle of the inside of carburetor be four bifurcated nozzles along 4 gaps are set ring week, therefore improves Mixing combustion fluid state of the vapour through gap and be conducive to atomization.Although spark-ignition process and two rushing detailed physical and chemical processes very Complexity, the mankind are still not clear there are many aspect so far, but we perhaps can be initially believed that, this scavenging road junction inclined wedge turbulent flow It returns and alters piece, generate turbulent flow with inclined wedge at scavenging road junction, returning a possibility that channeling to gas handling system to exhaust gases after combustion has retardance Effect, doubtful to belong to turbulent ventilation, well known cross flow scavenging, loop scavenging and uniflow scavenging three for two-stroke internal combustion engine For kind ventilation scheme, open an energy emission reduction alters the approach of piece in scavenging road junction inclined wedge turbulent flow time, referred to as turbulent The clino-diagonal of scavenging or the shortcut of low emission.Although the mechanism of its atom level needs the following exploration, it rushes gasoline engine scavenging two The application at road junction has determined that and starts batch production, represents the developing direction of 20 years Low-emission gasoline brush cutters from now on.Pile is cut to beat Careless wire is more durable than nylon wire mostly, is not only conducive to long-acting cutting, few with line, saves into disk nylon wire；And can beat the grass, also Straw can be cut and nylon wire cuts motionless thin bar；Beat the grass wire when cutting different objects and disc cutterbar complement each other it is each has something to recommend him. And the long diameter of beating the grass that is equal to of its roller of long grass pressing wheel then can just be pressed onto the grass just cut, to press careless effect obvious.With thin Long grass pressing wheel, in order to press careless soil moisture conservation, material-saving rolls covering face height, and meadow embossing is beautiful.

The filtering scavenging gasoline brush cutter is low using the two-cycle gasoline engine for adding strainer in scavenging channel The engine of discharge, be near piston top dead center, in cylinder before the ignition of mixed gas of compressed piston upper, by Moved up in piston train of dress portion and open the preparation air entry in latch-release cylinder, in the crankcase below piston suck fuel and The gaseous mixture of air；The pressure of the burning gases of the piston upper generated again due to igniting, piston is from top dead-centre to bottom dead centre side To movement and air entry is simultaneously closed off, the gaseous mixture in compression crankcase is vented in the piston upper of bottom dead center-nearby from opening and closing While the burning gases in cylinder are discharged to outdoor gas in mouth, the scavenging access being connected by crankcase with cylinder, Gaseous mixture is imported into the two cycle engine in cylinder from crankcase by preparation scavenging port in piston upper latch-release cylinder；The design There is the valve gear with crankshaft-synchronous, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging access configures At normally closed；When the valve-closing of the crankcase side of scavenging access, gaseous mixture in scavenging access by combustion gas fire Flame is allowed to burning of igniting, and after HC reduction again from crankcase to scavenging port, the crankcase side of scavenging access is allowed to be open, in scavenging While the burning of access is sent out with gaseous mixture, the gaseous mixture in crankcase closes exhaust outlet before being discharged from exhaust outlet, Here it is the two cycle engines for substantially reducing the discharge of HC；Strainer (58) in the scavenging channel is located at technique butt strip (55) side, or be located under scavenging channel；The strainer in the scavenging channel is to be formed by a plurality of wire through knitting device, right Breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；It is equipped with multiple wedges (11b) that noise control strainer is equipped with, the wedge It is multiple hollow six prismatics, has aperture, the advanced wedge compression of air-flow on top, then escape and expand from wedge aperture, there is noise elimination effect； It is equipped with catalyst volume (59) again, platiniferous rhodium indium iridium has catalyst effect, the ingenious row for slowing down pneumatic noise and HC to gas is flowed through It puts.

The two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, is used for brush cutter, containing stock, cuts Cutter, manipulating handgrip assembly, the stock contain aluminum pipe, are equipped with transmission shaft, institute in the cavity being equipped with inside the aluminum pipe It states aluminum pipe and transmission shaft the upper end and is installed with the cutting equipped with engine i.e. engine, the aluminum pipe and its lower end of transmission shaft Device is installed with hand handle in the middle part of the aluminum pipe；The brush cutter its contain the two-cycle gasoline engine, that is, engine (1), interior six Angle fillister head screw M6x30 (2), hexagon socket cap head screw M5x8 (3), 31 type hex nut M6 (4), PP wire clamp (5), PA Hanging ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM hanging ring fixing seat (8), hexagon socket cap head screw M5x20 (9), it is preceding connect aluminum pipe (10), manipulating handgrip assembly (11), control handle pipe (12), 13 band spring washers in hexagonal cylindrical head Screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), left handgrip component (16), nitrile rubber hand handle Shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19), five leaf nylon tubes(20), transmission shaft(21), deep groove ball bearing III (22), spring washer 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27), rear aluminum pipe(28), 4 hexagon socket cap head screws M5x12 (29), 4 spring washers 5 (30), limit handle spring (31), limit handle lock (32), limit handle (33), opening Retaining ring 2.5 (34), shield fixing seat (35), circlip for hole 26 (36), circlip for shaft 10 (37), roundlet gear with curved teeth (38), small arc-shaped gear oil block up (39), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), Plain washer 6 (42), gear-box (43), great circle gear with curved teeth (44), splined shaft (45), deep groove ball bearing 6002I (46), hole elasticity Retaining ring 32 (47), gear-box shield (48), spline pad (49), disc cutterbar contain 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 Tooth disc cutterbar (64) or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead shield (52), 1 type hex nut M10 left-handed (53), Or nylon moving head (54), harness (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross recess coiled hair Tapping screw ST4x14 (59), shield A (60), shielding support (61), hexagon socket cap head screw M5x35 (62), left hand (16-1), 1 type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4), the waistband (66) for having pallet (67), auxiliary turn ball (68), catalyst hush tube (69)；The gasoline engine (1) is used 1E39F, single cylinder and 39 cylinder diameters and air-cooled, assembly containing starter (F1), starting driver plate component (F2), 2 oil sealings (F3), right casees Body (F4), 2 deep groove ball bearing II (F5), contain hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6) in 2 torque 7-9NM Muffler ASSY (F7), silencer pad (F8), the right shock-reducing sleeve of fuel tank (F9), 2 retaining ring for piston pins of catalyst hush tube (69) (F10), piston pin (F11), needle bearing (F12), piston (F13), piston ring (F14), crank assemblby (F15), woodruff key (F16), cylinder block pad (F17), cylinder block (F18), 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19), engine enclosures (F20), recessed pan head tapping screw ST5 × 14 (F21), igniter assembly (F22), 2 crosses fluting screw assemblies M4 × 20 (F23), spark plug (F24), without asbestos packing sheet mould assembling pad (F25), 2 mould assembling positioning pins (F26), left box body (F27), 5 Cross fluting screw assemblies M5 × 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch disk (F31), axis bullet Property retaining ring (F32), the left shock-absorbing sleeve L (F33) of fuel tank, the right shock-absorbing sleeve R (F34) of fuel tank, inserts bearing connection seat (F35), 3 crosses Slot screw assemblies M5 × 20 (F36), upper clamp plate shock-absorbing sleeve (F37), lower clamp plate shock-absorbing sleeve (F38), upper clamp plate (F39), lower folder Plate (F40), 2 interior hexagonal cylindrical head screw assemblies M5 × 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 skies Filter seat pad set (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 spring washers (F47), 2 ten Word fluting coiled hair bullet screw M5 × 63 (F48), air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50), 2 Air inlet pipe pad (F51), deflector (F52), polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), without asbestos packing sheet Oily device pad (F55), carburetor assembly (F56), PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrile Rubber oil tube socket (F59), fuel filter assembly (F60), oil pipe clip (F61), HDPE are blow molded fuel tank (F62), cap assembly of fuel tank (F63), 5-7NM hexagon-headed bolt plain cushion combination M6X14 (F64), 4 3-5NM cross flutings screw assemblies M5X18 (F65), institute Its two-cycle gasoline engine for being included of the brush cutter stated, passes through the hexagon socket cap head screw M6x30 (2), interior hexagonal Fillister head screw M5x8 (3) and 31 type hex nut M6 (4), with it is described before connect aluminum pipe (10) and be connected；It is connect before described The outside of the pipe of aluminum pipe (10), by the PP wire clamp (5), PA hanging ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM hanging ring fixing seat (8), hexagon socket cap head screw M5x20 (9) and with harness (55) form harness portion, so as to handle Harness is worn in single shoulder；It is connect on aluminum pipe (10) before described, is installed with manipulating handgrip assembly (11), be by control handle pipe (12), more band spring washer hexagon socket cap head screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), Left handgrip component (16), nitrile rubber hand handle shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19) institute are common Composition；The inside that the pipe of aluminum pipe (10) is connect before described is installed with the five leaf nylon tubes(20), it passes Moving axis(21) and deep groove ball bearing III (22) is to be driven；Aluminum pipe (10) are connect before described passes through the spring washer 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27) and institute Rear aluminum pipe (28) connection stated, and pass through 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5 (30), limit hand Handle spring (31), limit handle lock (32), limit handle (33), split washer 2.5 (34) and form limit Handleset；Institute The end for the rear aluminum pipe (28) stated is installed with the shield fixing seat (35), circlip for hole 26 (36), axis elasticity Retaining ring 10 (37), roundlet gear with curved teeth (38), small arc-shaped gear oil block up (39) and more band spring washer hexagon socket cap head screws M5x25 (13), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42) and Gear-box (43), great circle gear with curved teeth (44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), tooth Roller box shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead shield (52)；The cutter Containing shield and moving head and disc cutterbar to select；It is left-handed (53) with the 1 type hex nut M10 to fill cutterhead；Or Nylon moving head (54) are filled to replace disc cutterbar, and cutting is beaten the grass the small blade (57) of line, passes through hexagonal flange Face nut M5 (56), knife rest (58), cross recessed pan head tapping screw ST4x14 (59) are mounted on the shield A (60), and Shielding support (61) and hexagon socket cap head screw M5x35 (62) are installed；Cutterhead can multiselect or 2 tooth disc cutterbars (63), or 4 tooth disc cutterbars (64) or 8 tooth disc cutterbars (65), to select the shrub for cutting different cultivars；The left handgrip component (16), by Left handgrip (16-1), 1 type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4) is formed, and is mounted on left handgrip pipe (19)；And have the waistband (66) of pallet (67), people's waist can be tied up to, is held in the palm Disk (67) and auxiliary turn ball (68) movable contact, and auxiliary turns ball (68) and connect with engine enclosure (F20), further to lengthen Cut coverage；Catalyst hush tube (69) connects the gas outlet of muffler ASSY (F7), so that exhaust gas is through aluminum pipe and near cutter Discharge；The engine start part of the two-stroke LPG engine include starter assembly (F1), starting driver plate component (F2), Equipped with 2 oil sealings (F3) and 2 deep groove ball bearing II (F5), to be rotationally mounted in the right case (F4) of engine On；By hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6) in 2 torque 7-9NM, the noise elimination of hush tube containing catalyst (69) Device assembly (F7) and silencer pad (F8), are fixed on cylinder block (F18)；The right vibration damping of fuel tank is housed on cylinder block (F18) It covers (F9)；2 retaining ring for piston pins (F10), piston pin (F11), needle bearing (F12), piston are provided in cylinder block (F18) (F13), piston ring (F14) and crank assemblby (F15) set woodruff key (F16) on crankshaft；Cylinder block pad (F17) is mounted on cylinder On body (F18)；2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19) and recessed pan head tapping screw ST5 × 14 (F21) are starting Machine outer cover (F20) is fixed on cylinder block (F18)；Igniter assembly (F22) passes through 2 crosses fluting screw assemblies M4 × 20 (F23) fixed；Spark plug (F24) is also on cylinder block (F18)；No asbestos packing sheet mould assembling pad is put on cylinder block (F18) (F25), 2 mould assembling positioning pins (F26), and it is fixed left box body (F27) with 5 cross flutings screw assemblies M5 × 25 (F28)；Magnetic Flywheel (F29) matches on crankshaft, and with clutch assembly (F30), clutch disk (F31) and circlip for shaft (F32) It closes；The left shock-absorbing sleeve L (F33) of fuel tank and the right shock-absorbing sleeve R (F34) of fuel tank are on the outer cover (20)；Inserts bearing connection seat (F35) it is fixed by 3 cross flutings screw assemblies M5 × 20 (F36)；Upper clamp plate is housed on the connection seat (F35) Shock-absorbing sleeve (F37), lower clamp plate shock-absorbing sleeve (F38) and upper clamp plate (F39) lower clamp plate (F40) and with 2 interior hexagonal cylindrical heads Screw assemblies M5 × 18 (F41) clamp；Flame-out wire clamp (F42) is also equipped on the connection seat (F35)；Air filter seat (F43), 2 air filter seat pad sets (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46) pass through 2 M5 bullets Pad (F47) and 2 cross flutings coiled hair bullet screw M5 × 63 (F48) air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50) form air filter, and are packed on carburetor；2 air inlet pipe pads (F51), deflector (F52), polyphenylene sulfide PPS into Tracheae (F53), grounding wire component (F54) form carburetion without asbestos packing sheet carburetor packing (F55), carburetor assembly (F56) Device；PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter Component (F60), oil pipe clip (F61), HDPE blow molding fuel tank (F62), cap assembly of fuel tank (F63) form fuel tank；And 5-7NM turret head It is the fixed starting driver plate component (F2) that bolt plain cushion, which combines M6X14 (F64), as 4 3-5NM cross fluting groups Closing screw M5X18 (F65) is that the fixed starter assembly (F1) is used；On the waistband (66) for having pallet (67) Equipped with pallet (67), auxiliary can be placed on pallet (67) and is turned ball (68), and assist turning ball (68) mounted in external engine, Huo Zhezhi It connects and brush cutter engine is placed on the pallet (67) that waistband (66) is equipped with comes up operation；It is living that pallet (67) and auxiliary turn ball (68) Dynamic contact, auxiliary turns ball (68) and connect with engine enclosure (F20), further to lengthen cut coverage；Catalyst hush tube (69), one end connects the gas outlet of muffler ASSY (F7), connects aluminum pipe before another termination, so as to exhaust gas after described aluminium Pipe, and be discharged near cutter；The catalyst hush tube (69) is aluminum, have exhaust gas by so as to have aluminium dioxide catalyst effect It answers；The muffler ASSY (F7) is aluminum, has exhaust gas by just there is aluminium dioxide catalyst effect；Aluminum pipe is connect before described (10) and rear aluminum pipe (28) be it is separated, have exhaust gas by there is aluminium dioxide catalyst effect；Five in the rear aluminum pipe Leaf nylon tube sets foam honeycomb body, and adds catalyst catalyst in foam honeycomb body, has catalyst is polynary to urge when to there is exhaust gas to pass through Change effect；The 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) are commonly referred to as cutting for cutter for selecting Cutterhead is equipped with multiple outer cutting edges (641) in cutterhead periphery, so that brush allows knife less；The 2 tooth disc cutterbars (63), 4 teeth are cut Cutterhead (64), 8 tooth disc cutterbars (65) are equipped with multiple inner cutter holes (642) in cutterhead periphery, so as to card branch in brush not；Institute In the carburetor assembly (F56) stated, the interior straight tube (70) for improving atomizer is the vortex spray bar for having helicla flute (71), in favor of Dissipate mixed effect；In the carburetor assembly (F56), improves the interior straight tube (70) of atomizer or have helicla flute (71) The import of vortex spray bar is the horn mouth for having parabolical horn mouth (72) or conical section such as archimedes curve, In favor of polymerizeing contaminated product effect；On the left handgrip pipe (19), (19b) is taken in the damping equipped with close circle helical spring shape, So as to further damping；Using there are transparent or partially transparent shield (60), operated with the more convenient observation brush of benefit；This The two-stroke LPG that the single-cylinder air-cooled equal pressure angle logatithmic spiral runner bilayer cooling of the small two-stroke that brush cutter uses is eliminated the noise draws Hold up, belong to the engine of low emission, be the improvement of internal combustion engine the combustion chamber for having function wave and with have active receiving electrode and micro- On the basis of the collocation of the internal combustion engine ignition device of dynamic discharge electrode, and double auxiliary skirt rims are added to reduce hydrocarbon in piston skirt On the basis of the petrol engine of discharge, and is returned in improved piston skirt logarithmic differentiation isogonal line skirt turbulent flow and alter drop row's On the basis of petrol engine, double auxiliary blow vents of further improved narrowed left and right block reduce the two of discharge and rush gasoline engine Machine；In piston skirt plus double auxiliary skirt rims, there is the effect that emission reduction is up to standard；Piston skirt logarithmic differentiation isogonal line skirt turbulent flow returns and alters drop The petrol engine of row is to be equipped with double auxiliary skirt rims (g37) in the skirt section of piston (g31)；The double auxiliary skirt rims (g37) be On the basis of two skirt of original for retaining the bilateral for not having connecting rod pin hole of original piston, and there is connecting rod in the skirt section of piston (g31) The bilateral of pin hole it is following, an auxiliary skirt is also added on every one side, becomes double auxiliary skirt rims (g37)；The double auxiliary skirt rims, Containing bottom edge (g38), lower fillet (g39), side (g40), upper fillet (g41), the concave arc side (g42) on bottom edge, piston double auxiliary skirts Isogonal one section of the through-hole (g43) on side, piston skirt logarithmic differentiation equation is located at skirt, is conducive to auxiliary guiding, Additional turbulence, which is returned, alters and drops row and lubrication assistant and heat dissipation；The double auxiliary skirt rims or with aluminium alloy, or with composite material so as to Reduce cylinder prepareding gap；Each auxiliary skirt of the double auxiliary skirt rims (g37) and two skirt of original are outside piston The extension of the cylindrical body of circumference, and it is along the outside piston week quartering that its projection, which is thrown on the face vertical with piston motion direction, 's；Each cylindrical body of auxiliary skirt than two skirt of original along outside piston week of the double auxiliary skirt rims (g37) prolongs Long is longer, that is to say, that the bottom edge of former two skirts of bottom edge (g38) ratio of double auxiliary skirt rims is in the cylindrical body extended line along piston Farther apart from connecting rod pin hole on direction, i.e., double auxiliary skirt rims are higher, and piston and skirt section are longer, and effect is conducive to lengthened piston It is oriented to length and assists being oriented to；The two sides of the double auxiliary skirt rims (g37) are equipped with the side (g40) of double auxiliary skirt rims, and connection is lived Fill in the bottom edge (g38) of (31) and double auxiliary skirt rims；The two sides of the double auxiliary skirt rims (g37), it is piston (31) and double auxiliary equipped with connecting The angle of the side (g40) of the double auxiliary skirt rims on the bottom edge (g38) of skirt, the side (g40) of two sides is greater than 100 degree；Described The two sides of double auxiliary skirt rims (37) are equipped with the side (g40) of double auxiliary skirt rims, are the upper fillets (g41) by the side of double auxiliary skirt rims To connect piston (g31)；The two sides of the double auxiliary skirt rims (g37) are equipped with the side (g40) of double auxiliary skirt rims, are by double The lower fillet (g39) of the side of auxiliary skirt connects the bottom edges (g38) of double auxiliary skirt rims；The bottom of the double auxiliary skirt rims (g37) Bian Shangshe concave arc side (g42)；The concave arc side (g42) or circular arc or involute or parabola, with benefit auxiliary drop Row；Through-hole (g43) or pit are set in the double auxiliary skirt rims (g37), with sharp lubrication assistant and heat dissipation；The double auxiliary skirt rims (g37) on and piston is equipped with multiple through-holes (g43), is slightly in up-side down triangle arrangement, has multiple rows of, most downlink through-hole is few, more past Uplink through-hole is more, with sharp lubrication assistant and heat dissipation；Cylinder body (g44) be two rush petrol engine dress piston cylinder chamber on Cylinder body (g44) along the symmetrically scavenging road junction (g45) containing left and right each one, in the symmetrical of the cylinder body (g44) Symmetrically each ground in left and right is equipped with inclined wedge turbulent flow time and alters piece (g46) on the scavenging road junction (g45) of left and right each one, utilizes higher mathematics The equal feature of logatithmic spiral tool pressure angle, return the inclined wedge turbulent flow and alter piece and have logatithmic spiral by logarithmic differentiation equation As soon as section, then it is easily steady to gush mixed air-flow on it, is blocked at scavenging road junction using equal pressure angle generation turbulent flow with benefit Exhaust gas, which returns, alters to reduce discharge；The inclined wedge turbulent flow goes back to the bottom for altering the bottom at the scavenging road junction (g45) that piece (g46) is located at cylinder body The side of the outlet of the scavenging air belt close to piston for closing on lower dead center in portion, one section of tool logatithmic spiral；The inclined wedge is disorderly Flow back to alter piece (46) include inclined wedge turbulent flow return alter the scavenging road junction (g47) of piece, inclined wedge turbulent flow returns the oblique of the logical scavenging road junction for altering piece Wedge (g48), inclined wedge turbulent flow return that returning for the logical scavenging road junction for altering piece alters grid (g49), inclined wedge turbulent flow goes back to the logical scavenging road junction for altering piece Turbulent shield (g50), has one section of logatithmic spiral；The inclined wedge turbulent flow, which returns, alters piece (g46) slightly in inclined wedge-shaped, the inclined wedge The big end of shape is connected to the scavenging air belt close to piston for closing on lower dead center of the bottom of the bottom at the scavenging road junction (g45) of cylinder body Outlet side, tool one section of logatithmic spiral；The inclined wedge turbulent flow time is altered the inclined wedge turbulent flow time that piece (g46) is included and is altered The scavenging road junction (g47) of piece is located at the inclined wedge turbulent flow and goes back to the top for altering piece (46), that is to say, that returns in inclined wedge turbulent flow and alters piece (g46) one section of its tool logatithmic spiral of the small end of inclined wedge-shaped；The inclined wedge turbulent flow returns alter that piece (g46) included described Inclined wedge turbulent flow return alter piece logical scavenging road junction inclined wedge (g48) be located at inclined wedge turbulent flow return alter piece (g46) inside and with cylinder body The bottom connection of the bottom at scavenging road junction (g45), one section of its tool logatithmic spiral of the inside；The inclined wedge turbulent flow returns It alters the inclined wedge turbulent flow that piece (g46) is included and returns returning to alter grid (g49) and be located at inclined wedge turbulent flow and returning for the logical scavenging road junction for altering piece The intersection of the side of the outlet of the scavenging air belt at the scavenging road junction (g45) of piece and cylinder body is altered, has one section of logatithmic spiral；It is described Inclined wedge turbulent flow return to alter the inclined wedge turbulent flow that piece (46) is included and return returning for the logical scavenging road junction for altering piece and alter grid (g49) and be located at Inclined wedge turbulent flow returns at the chamfering for the side of the outlet of the scavenging air belt at scavenging road junction (g45) for altering piece and cylinder body, has logatithmic spiral One section；The inclined wedge turbulent flow, which returns, alters time that the inclined wedge turbulent flow that piece (g46) is included goes back to the logical scavenging road junction for altering piece Alter grid (g49) be located at inclined wedge turbulent flow return alter piece and cylinder body scavenging road junction (g45) scavenging air belt outlet side rounded corner Place, one section of tool logatithmic spiral；The inclined wedge turbulent flow returns to alter the upper surface of piece (g46) and return equipped with inclined wedge turbulent flow and alters the logical of piece and sweep The turbulent shield (g50) of gas port, one end alter the scavenging air belt at the scavenging road junction (g45) of piece and cylinder body with being located at inclined wedge turbulent flow and return It is connected at the chamfering of the side intersection of outlet, and the top that its other end and inclined wedge turbulent flow time alter piece is that is turbulent with inclined wedge The small end for returning the inclined wedge-shaped for altering piece (g46) is connected；And the upper surface of described turbulent shield its also have one section of logatithmic spiral；Narrow a left side Double auxiliary blow vents of right block reduce the two of discharge and rush petrol engine, containing left block, right block, piston and combustion chamber, spark Plug, gray iron, cylinder barrel, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling system, it is described Cylinder body (g44) be two rush petrol engine on the cylinder chamber of dress piston along scavengings symmetrically containing left and right each one The cylinder body (44) at road junction (g45), it is each symmetrical on the scavenging road junction (g45) of the symmetrical left and right each one of the cylinder body (g44) Each ground in ground left and right is equipped with inclined wedge turbulent flow time and alters piece (g46)；The skirt section of the piston is equipped with double auxiliary skirt rims (g37)；It is described Double auxiliary skirt rims (g37) be on the basis of retaining former two skirt of the bilateral for not having connecting rod pin hole of original piston, and in piston (g31) bilateral for having connecting rod pin hole in skirt section it is following, it is every to add an auxiliary skirt on one side, become double auxiliary skirt rims (g37)； The double auxiliary skirt rims, containing bottom edge (g38), lower fillet (g39), side (g40), upper fillet (g41), bottom edge concave arc side (g42), the through-hole (g43) of piston and double auxiliary skirt rims, the logarithm line of its piston skirt of piston logarithmic differentiation equation Isogonal one section is claimed to be located at skirt, the side of the part of skirt is pressure angle close to the equal logarithm spiral shell by logarithmic differentiation equation One section of line returns the inclined wedge turbulent flow and alters piece (46) using the equal feature of the logatithmic spiral tool pressure angle of higher mathematics A Duan Yili with logatithmic spiral is blocked exhaust gas time using equal pressure angle generation turbulent flow at scavenging road junction and altered to reduce Discharge；The double auxiliary skirt rims or with aluminium alloy, or with composite material to reduce cylinder prepareding gap；It, be first with CNC machining center Tungsten copper electrode is produced, assists molding with the lathe for having three-dimensional rotation head, then produced in batches with die casting machine；It machines and is electroplated again； The left block and its left block of right block and right block, which are respectively provided with, changes the small double auxiliary blow vents to narrow, double auxiliary ventilations It is left double auxiliary blow vents (51b) that mouth, which is located at left block just, and it is right pair of auxiliary blow vents that double auxiliary blow vents, which are located at right block just, (52b), the left block and right block are to assemble Face to face, and be connected with the upper surface of the scavenging air belt of cylinder body, described The double auxiliary blow vents (51b) in a left side and the right block that two scavenging air belts of cylinder body are equipped with the left block (g51) respectively (g52) the double auxiliary blow vents (52b) in the right side being equipped with are connected, and are double auxiliary blow vents of narrowed left and right block, when pair When auxiliary blow vent and the close double auxiliary skirt rims (g37) that the skirt section for running to plug near piston lower dead center is equipped with, just it is conducive to narrow Local volumetric, increases local air flow pressure and flow velocity and additional turbulence returns and alters and drop row；The narrowed left and right block it is double auxiliary Blow vent is set with the symmetrically each ground in left and right each on the scavenging road junction (g45) of the symmetrical left and right each one of the cylinder body (g44) Some inclined wedge turbulent flows, which return, alters both pieces (g46) adapted, there is drop row's effect；Double auxiliary blow vents of the narrowed left and right block and institute Both double auxiliary skirt rims (g37) that the skirt section for the piston stated is equipped with adapted has drop row's effect；Pair of the narrowed left and right block Each symmetrically each ground in left and right on auxiliary blow vent, with the scavenging road junction (g45) of the symmetrical left and right each one of the cylinder body (g44) The inclined wedge turbulent flow being equipped with is returned and is altered piece (g46), and double auxiliary skirt rims (g37) three being equipped with the skirt section of the piston matches With there is more drop row effect；The left side that the left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with The rear wall (51f) of double auxiliary blow vents (51b) is thicker, and thinnest part is no less than 2mm, and has the oblique angle greater than 10 degree, more so as to root It is thick and increase intensity；The left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with 4 reinforcement arm pawls (51e), and the rectangular section of each reinforcement arm pawl is thicker, thinnest part is also no less than 2mm, increases intensity so that section is thicker； The back for the double auxiliary blow vents (51b) in a left side that the left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with It is equipped with long reinforcing rib (51c) near face, so as to the part pressure for increasing intensity to resist bigger caused by narrowing double auxiliary blow vents Power；The double auxiliary blow vents (51b) in a left side that the left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with It is equipped with short reinforcing rib (51d) near the back side of pit, it is bigger caused by narrowing double auxiliary blow vents to resist to increase intensity Local pressure；The double auxiliary ventilations in the right side that the right block (g52) of double auxiliary blow vents of the narrowed left and right block is equipped with Mouth (52b) is pit, and a left side double auxiliary blow vent (51b) that the length, width and height of pit are about equipped with the left block (g51) is identical, To increase intensity, local pressure bigger caused by narrowing double auxiliary blow vents is resisted；The narrowed left and right block it is double auxiliary The double auxiliary blow vents (52b) in the right side that the right block (g52) of blow vent is equipped with are pits, length, width and height of pit and described The double auxiliary blow vents (51b) in the left side that left block (g51) is equipped with are identical, and the length and width on engine are a height of to be not more than 19x7x4.8mm, with Convenient narrowed local volumetric, increases local air flow pressure and flow velocity and additional turbulence returns and alters and drop row；The exhaust gas of engine is not Direct emission, but by being discharged indirectly after one meter five of catalyst hush tube from the nearly tool bore (28a) of aluminum pipe；The cutter Containing with cut pile beat the grass wire (54b) moving head (54) with the long-acting cutting of benefit, and the disc cutterbar with inner sawtooth (642) (64) to prevent allowing knife；And the carburetor of its engine sets four bifurcated nozzles (70a) with benefit atomization；And the cutter is set There is the outer protective cover (73) on interior shield (60) and is equipped with the long length for being equal to diameter of beating the grass of its roller on its outer protective cover Grass pressing wheel (74), in order to press grass soil moisture conservation and meadow decorative pattern；What the moving head (54) contained by the cutter was had cuts Pile is beaten the grass, and wire (54b) to be equipped with the way of multiple sharp swords (54a) its multiple sharp swords be on wire with sharp plain chisel Cut what pile went out under hammering, and the wire is round；What the moving head (54) contained by the cutter was had cuts Pile beat the grass wire (54b) be equipped with multiple sharp swords (54a), the way of multiple point swords or on wire with there is sharp edge Plunger chip die cut what pile went out under the impact of press machine, and the wire is flat；Band contained by the cutter The outer cutting edge (641) of the periphery of the knife for 4 stretchings that the disc cutterbar (64) of inner sawtooth (642) is equipped with is equipped with multiple outer saws Tooth (64a), and the inner sawtooth (642) also has 4, and its every inner sawtooth (642) sets multiple sawtooth；Described cuts The outer protective cover (73) installed on interior shield (60) set by cutter is equipped with installation card slot (73b) and 2 screw hole locations (73a) is with benefit installation, and the limit (73c) equipped with rope of beating the grass on its outer protective cover (73), and on its outer protective cover (73) Equipped with the grass pressing wheel mounting bar (73d) and arc enclosing item (73e) for installing long grass pressing wheel (74)；Described its roller length etc. It is that rotatably, axial length, that is, roller of grass pressing wheel is long straight much larger than its grass pressing wheel in the long grass pressing wheel (74) for diameter of beating the grass Diameter, 3 times of the long diameter for being at least its grass pressing wheel of axial length, that is, roller of grass pressing wheel；The diameter of beating the grass refers to described The distance of the limit (73c) for the rope of beating the grass that its outer protective cover (73) is equipped with to cutter Pivot axle is radius of beating the grass, Its 2 times are the diameter of beating the grass；And long its roller of grass pressing wheel (74) is grown to be equal to and beats the grass diameter then just the careless energy just cut It is pressed onto；The long long grass pressing wheel (74) for being equal to diameter of beating the grass of its described roller is rotatable and its grass pressing wheel axial length i.e. roller Axial length, that is, roller of the long diameter for being much larger than its grass pressing wheel, grass pressing wheel is long or 10 times of the diameter of its grass pressing wheel or more It is more, in order to press careless soil moisture conservation；The long long grass pressing wheel (74) for being equal to diameter of beating the grass of its described roller is equipped with the careless slot of multiple pressures (74b), slot is along its roller length direction or straight slot or wavy curved slot；And the slot cross-section for pressing careless slot It is (74a) or rectangular or semicircular, and the careless slot of the multiple pressure is at least 2, in order to press grass soil moisture conservation and meadow pressure Decorative pattern and few skidding；The carburetor of its engine sets four bifurcated nozzles (70a) and refers to nozzle in the inside of carburetor (70) along 4 gaps are set ring week it is four bifurcated nozzles (70a) on outlet, combustion flow-like of the vapour through gap is mixed with improvement State and be conducive to atomization；The two-stroke LPG engine that the equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise, is in piston Near top dead-centre, since piston train of dress portion moves up and make out before the ignition of mixed gas of compressed piston upper in cylinder The preparation air entry closed in cylinder is opened, and the gaseous mixture of fuel and air is sucked in the crankcase below piston；Again due to point The pressure of the burning gases for the piston upper that fire generates, piston is mobile from top dead-centre to bottom dead centre direction and simultaneously closes off air-breathing Mouthful, the gaseous mixture in compression crankcase makes the burning gases in cylinder from opening and closing exhaust outlet in the piston upper of bottom dead center-nearby To outdoor gas be discharged while, the scavenging access being connected by crankcase with cylinder, in piston upper latch-release cylinder by Gaseous mixture is imported into the two cycle engine in cylinder by preparation scavenging port from crankcase；The design has to be filled with the valve of crankshaft-synchronous It sets, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging access is configured to normally closed；In scavenging access When the valve-closing of crankcase side, the gaseous mixture in scavenging access is allowed to burning of igniting by the flame of combustion gas, and HC is reduced Later again from crankcase to scavenging port, the crankcase side of scavenging access is allowed to be open, in the burning mixing pneumatic transmission of scavenging access While out, the gaseous mixture in crankcase closes exhaust outlet before being discharged from exhaust outlet, and here it is keep the discharge of HC significant The two cycle engine of reduction；It solves in pervious structure and the valve of the above-mentioned crankshaft same period is not because being designed, combustion gas If scavenging port is not opened also after the flame extinction of body, the flame of burning gases can make the mixing in scavenging access and crankcase Gas ignition makes gaseous mixture without supplying in normal direction cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinder When interior exhaust outlet and scavenging port is open at the same time, the unblended mixture in crankcase and in scavenging access enters from exhaust outlet In cylinder, so a part of gaseous mixture is discharged in the state of unburned from exhaust outlet, become the mixing in discharge gas The problem of gas (i.e. HC) increases；The present invention after crankcase scavenging, is being swept except the air entry exhaust outlet scavenging port The crankcase side of gas access has added opening and closing valve, and the gaseous mixture in scavenging access ignites and burns in the flame of combustion gas, And be in scavenging access and crankcase according to crankshaft and the valve of synchronizing cycle can be truncated, so the gaseous mixture in crankcase is not It can burn, while mixing of the combustion gas in scavenging access when the valve openings with the crankshaft-synchronous period, in crankcase Gas can be extruded out in cylinder, the initial stage when exhaust outlet and scavenging port are open simultaneously, the burning gases in scavenging access It is fed into cylinder, HC will not be adulterated into external discharged exhaust gas from exhaust outlet, when exhaust outlet will close, The unblended mixture continued in crankcase in spent gaseous mixture in scavenging access is fed into cylinder, so exhaust The HC amount adulterated in gas can control reduction；The valve gear having with crankshaft-synchronous is to add crankshaft on crankshaft (57) The c-type circle (56a) of valve (56), the inclined wedge that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle It encloses (56b), when the side for having oblique angle of the two sides of its a bit of opening is rotated with crankshaft, in the scavenging channel of latch-release cylinder Just there is shearing when being connected to the oral area of crankcase and reduces impact；Metal cap and the cooling of outer resin cover bilayer in the tool The two-stroke LPG engine of noise elimination, it is further characterized in that, the valve gear having with crankshaft-synchronous is on crankshaft (57) The two sides of a bit of opening of the c-type circle (56a) of crank valve (56) are added to be equipped with the pressure coil (56f) of logarithm, when the pressure The logatithmic spiral side of the two sides of a bit of opening of circle is rotated with crankshaft, the connection crankshaft in the scavenging channel of latch-release cylinder Pressure angle the logatithmic spiral influence air-flow of properties equivalent and the effect of buffering everywhere are just formed when the oral area of case；In scavenging channel The wedge (11b) of noise control strainer is located at beside the technique butt strip (55)；Scavenging channel beside the technique butt strip (55) In be equipped with the catalyst of emission reduction and roll up (59) its platiniferous rhodium indium iridium, there is catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through, have Regular hour difference and isolation and noise elimination adjustment effect, slow down exhaust outlet from HC to scavenging channel discharge, to be formed in Add the engine of strainer in scavenging channel；Add the two-cycle gasoline engine of double sieves and scavenging oral area trimmer valve in scavenging channel, has Emission reduction acts on and effect up to standard, and the strainer (58) in scavenging channel is located at beside technique butt strip (55), and separately has strainer (58) it is located under scavenging channel；The strainer in scavenging channel is to be formed by a plurality of wire through knitting device, described in scavenging channel Strainer has filtration, be located under scavenging channel it is described separately have strainer i.e. sieve and a scavenging oral area trimmer valve, double sieves are filtered Net is to breathing has regulating and controlling effect between gas and crankcase in cylinder；Metal cap and the cooling of outer resin cover bilayer are eliminated the noise in the tool Two-stroke LPG engine it is characterized in that, when to two-cycle gasoline engine idling blade aerodynamic noise analysis, use CFD (computational fluid dynamics) simulation, method is intended to carry out " numerical experiment " by computer, from theory Angle reappears physical process；In the hope of receiving, the cost that the numerical simulation compared with testing has is low, data easily obtain, from point of theory pair The advantages of problem is analyzed and development with computer and model, calculating cycle are constantly reduced, and calculated result is increasingly The effect of accurate；Flow field to brush cutter and field of turbulent flow carry out feasibility analysis and data analysis, determine brush cutter blade and Cutting Road is sound source, is simulated to the noise of brush cutter, meets reality as far as possible for the simulation of the trend of noise variation, makes every effort to Level of noise and experimental error are 10% or so；Noise source and eddy current crack be set as in turbulent boundary layer fluid matasomatism in blade and Interaction generates between fluid micellar and the disengaging of vortex, continuous spectrum random noise are set as the variation of flow regime to outlet stream Type modulation and outflow fluid and ambient atmos effect generate, and rotational noise is set as the fluid and stator and surrounding fluid of blade drive Effect generates, and experimental data is related with noise spectrum and the display noise energy in different frequency region, and blade of brush cutter rotary air is dynamic Mechanics noise basis frequency calculation formula: F=NZ/60, F are noise fundamental frequency, and N is rotating speed of flail, and Z is blade number；Do progress process: Geometrical model is established, computer simulation, is compared with experimental result, is changed structure and is simulated, establishes noise according to analog result Model, experimental verification；Way is started with from blade geometry and air duct geometry and rotating speed of flail, and cutting and blade CAD mould are established Type, unstrctured grid ICEM are generated, and are calculated fluid calculation MRF model in rotating machinery with FLUENT fluid data, are considered variable Velocity field and pressure field and tubulence energy obtain noise spectrum with LMS Virtual lab software, analyze noise source, and acquirement is made an uproar Sound data carry out noise reduction；Stable state tentative calculation parameter setting: grid is 4120000 unstrctured grids and dynamic mesh INTERFACE, turbulent flow Model is RANS (K-EPSILON), and blade rotational speed takes 3000 revs/min, and iterative steps take 1000；The trial result has vorticity figure, pressure Power cloud atlas, speed vector figure, three-dimensional motion pattern, pressure contour surface figure and planar flow line chart, there are also blade CAD models for the trial result Unstrctured grid is generated, obtains important computations the result is that engine bush knife speed low noise at 5700-7000 revs/min；Auxiliary point Analyse coarse filtration combination fine filtering buffering scavenging decompression film two-stroke LPG engine it is further characterized in that its revolving speed be per minute 5750 to 6950 turns；Strainer (58) in its scavenging channel is the coarse strainer of 50 mesh；And separately having strainer (58) to be located under scavenging channel is By the fie screen and scavenging oral area trimmer valve of 150 mesh；The two-stroke LPG that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise draws It holds up it is characterized in that: the two-stroke LPG engine sets pressure reducing valve membrane sheet for the mixed airgun controller of LPG gas；It is described to be fired with LPG combustion gas The engine of batch can is driving gardens machine；The fuel gas tank has LPG combustion gas, contains miniature propane fuel tank, described micro- The front of type propane fuel tank (t20) is equipped with pipe screw thread, so that the fuel enters engine through mixed airgun controller by pipe fitting And work, the front of the fuel tank be additionally provided with safety valve so as to it is in excess of the quota when overflow and rise safety effect；The fuel tank Rear portion be equipped with tank bottom attic base (t20c), and on the tank bottom attic base (20c) be equipped with multiple equal distributions base holes (t20d) with portable；The tank diameter of the fuel tank is replaced containing 465 grams of propane fuel by standard less than 98 millimeters；；It is described etc. The two-stroke LPG engine that the cooling of pressure angle logatithmic spiral runner bilayer is eliminated the noise is it is characterized in that: the hush tube containing catalyst (69) Muffler ASSY (F7) is mounted on the two-stroke LPG engine by the silencer pad (F8), the muffler ASSY (F7) exit is nearby equipped with the inner outlet (F7C2) of interior metal cap (F7C1), then outer, is equipped with outer resin cover at a distance (F7j1) outer vent (F7j2) and log channel (F7j3), so that bilayer cooling is eliminated the noise.

It continuously improves and two-stroke LPG engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise It is characterized in that, it contains the valve gear with crankshaft-synchronous, it is the c-type circle (56a) for adding crank valve (56) on crankshaft (57) Rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer diameter of the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of the cylinder apart from engine 1E37F is in 0.02-0.07 milli Rice；It is further characterized in that the valve gear having with crankshaft-synchronous, is the c-type for adding crank valve (56) on crankshaft (57) Enclose (56a) rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the c-type circle it is a bit of The central angle in the two sides of opening to the crankshaft center of circle is in 82-92 degree.It is filled it is characterized in that, it contains with the valve of crankshaft-synchronous Set, be on crankshaft (57) plus crank valve (56) c-type circle (56a) rotation and the scavenging channel of latch-release cylinder connection crankshaft The oral area of case and formed, the central angle in two sides to the crankshaft center of circle of a bit of opening of the c-type circle is in 84-88 degree；Pressure Contracting is than being not more than 12.It is characterized in that, the valve gear having with crankshaft-synchronous, is to add crank valve on crankshaft (57) (56) rotation of c-type circle (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) be equipped with c-type edge (57a) its be it is corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and Cooperation is realized by a location hole.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Pin or a positioning sleeve cooperate to realize, and fixed with three screws.Have and crankshaft-synchronous it is characterized in that, described Valve gear, be on crankshaft (57) plus the c-type circle (56a) of crank valve (56), the c-type circle of the crank valve (56) have one small The two sides of section opening are set as the pressure coil (56f) at oblique angle, when the logarithm of the two sides of a bit of opening of the pressure coil Helical side is rotated with crankshaft, just forms pressure angle phase everywhere in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder Etc. the logatithmic spirals of characteristics influence the effect of air-flow and buffering.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, when described The side for having oblique angle of the two sides of a bit of opening of c-type circle is rotated with crankshaft, the connection in the scavenging channel of latch-release cylinder Shear flow is just formed when the oral area of crankcase and reduces the effect of mutation impact.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, the song The central axes at oblique angle and every side crankshaft that the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle of axis valve (56) are equipped with Angle in 15-27 degree, when the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle have the side at oblique angle with Crankshaft rotation just forms shear flow and slow drop mutation punching in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The effect hit.

It continuously improves and the two cycle engine of perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination is beneficial to drop It is mild to eliminate the noise；Its revolving speed is 5750 to 6950 turns per minute；Strainer (58) in its scavenging channel is the coarse strainer of 60 mesh；And it is another It is fie screen and scavenging oral area trimmer valve by 180 mesh that strainer (58), which is located under scavenging channel,.The vapour of engine is to multi-party Squeezed out to dispersion, have a vibration back and forth trembled and to adding fuel to the flames effect of steam flow, in the gas for accelerating fluid and coming from air filter Stream sharply mixes when handing over atomization and is more conducive to polymerize contaminated product effect and diverging mixed effect, is entered with the carburetion state being more atomized Engine；Cutter sets multiple sawtooth, continuously improves and perfect two cycle engine improves the quality of gardens machine.

The present invention solves the technical solution that its technical problem is taken and method is:

A kind of further improved engine is additionally provided with strainer i.e. sieve and scavenging oral area buffering in scavenging beneath galleries Valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as 6300 turns per minute It is preferred；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately having strainer (58) to be located under scavenging channel is 180 mesh Fie screen；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, indium and dilute Earth elements have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, but first lead to The hush tube containing catalyst (69) is crossed, then by function hush tube (54d), assists the tubule of hush tube (54g), fish scale wedge Then (54e), variable cross-section air hose (54f) noise reduction are run in by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again It puts；There are regular hour delay difference and isolation and noise elimination and obstruct adjustment effect, slows down pneumatic noise and the discharge of HC；It is described A kind of noise reduction and repacking G pad engine, which is characterized in that it is containing silica gel damping pad (54a), function hush tube (54d), auxiliary Help the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f)；The exhaust outlet of the cylinder of the engine connects The hush tube containing catalyst (69) is connect, then passes through function hush tube (54d), tubule, the fish scale wedge of auxiliary hush tube (54g) (54e), variable cross-section air hose (54f) noise reduction；The outgassing direction of the hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) Side is equipped with the silica gel damping pad (54a) and the variable cross-section air hose (54f) equipped with series winding；The variable cross-section air hose The inside of (54f) is equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, and edge The curve of the range of decrease of the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period be Axis；Multiple function hush tube (54d) groups, which are combined into the length of each hush tube of multistage noise elimination and caliber, to be had Variation sees that the length of each hush tube is shortened in single file and caliber is contracted step by step toward outgassing direction from front to back It is small；Each hush tube that multiple function hush tube (54d) groups are combined into multistage noise elimination is equipped with multiple fish scales Wedge (54e) and the wedge (50d) for having through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has the point of through-hole Split (50d)；The auxiliary hush tube (54g) of the collateral branch of auxiliary is additionally provided on the function hush tube (54d)；The auxiliary disappears Sound pipe (54g) is tubule, and the tubule has the wedge (50d) of through-hole；The variable cross-section air hose (54f) is variable cross-section , be at least three swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, at least three There is turn at place；The main rotating shaft line for blowing paddle wheel fan and the main rotating shaft line of the Wind Volume turbine (54c) have angle just Hinder outflow of the main noise of noise along straight central axes directly forwardly and rearwardly；What the Wind Volume turbine (54c) came out blows Wind enters on the first function hush tube (54d) being equipped with of inside and the hush tube of the variable cross-section air hose (54f) The small slot of arc and there is the wedge (50d) of through-hole first to be pressed that the multiple fish scale wedges (54e) being equipped with are equipped with Contracting comes out again and expands first order noise elimination process of just completing, the collateral branch for the auxiliary that the function hush tube (54d) is equipped with The tubule of auxiliary hush tube (54g) be for air-flow provides some outlets more and all not mix away from supervisor to further increase Noise elimination effect；The variable cross-section air hose (54f) is variable cross-section, and air-flow has compression-expansion from swollen portion bit stream to position is reduced Booster action；The variable cross-section air hose (54f) is that curved have turn to have booster action to preventing main noise from directly spreading out of；It completes The air-flow of first order noise elimination process come out from first function hush tube (54d), in the swell of the variable cross-section air hose (54f) Cavity in expand, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber and through institute State auxiliary hush tube (54g) and fish scale wedge (54e) the small slot of arc and have through-hole wedge (50d) by compression reflation And complete the noise elimination process that there is frequency variation of making an uproar in the second level；Complete second level noise elimination process from second function hush tube (54d) Air-flow out expands in the cavity of the swell of the variable cross-section air hose (54f), and through bend, subsequently into length and pipe The third function hush tube (54d) that diameter all changes and the arc through auxiliary hush tube (54g) and fish scale wedge (54e) Small slot and have through-hole wedge (50d) compression-expansion and after completing third level noise elimination process, from the air port of diminution, blowout subtracts It makes an uproar, is then discharged indirectly by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again；In the piston pin of engine piston The entrance at end, should not common pin hole chamfering (d18), the chamfering (d18) of pin hole on engine piston drawing is removed, there is hole And without chamfering, two G type elastic cushions are mounted directly, are zero with regard to rejection rate, actual effect is exactly unexpectedly good.

Did it is a kind of put-put piston pin end and meanwhile install two G type elastic cushions automated exchanged cutter positioning mechanism, though It can be used for production, but its outstanding problem to be high rejection rate.The entrance of the piston pin end of many engine pistons is broken and makes Engine piston is scrapped；Tried many schemes, groped several years it is all undesirable, but later with a unexpected method solution , here it is the entrance of the piston pin end in engine piston should not common hole chamfering, be mounted directly two G type elastic cushions just Rejection rate is zero, is used successfully to produce several years, is firmly believed, and the report present invention is now just dared, in the work of engine piston The entrance at plug pin end, should not common hole chamfering, have hole, no chamfering.Reason may be some for having the G type elastic cushion of opening With regard to skew when position contradicts chamfering (d18) of upper pin hole, so that piston is scrapped, no chamfering is all right, but in this way hair The chamfering (d18) of pin hole is removed on motivation piston drawing, who does not expect before, even if presently disclosed this is unable to the rhymed formula of chamfering Key, perhaps people is also recalcitrant, but the entrance of the piston pin end of engine piston should not common hole chamfering, there is Kong Erwu to fall Angle is zero with regard to several years rejection rate, and actual effect is exactly unexpectedly good.According to the regulation of machine-building, in general such as The important hole of the cooperation crankpin of the entrance of the piston pin end of such elephant engine piston should not the chamfering in common hole be It is inconceivable.Just the opposite is that the piston for not having chamfering is put into one kind small-sized under the occasional case for having forgotten to process chamfering The automated exchanged cutter positioning mechanism that two G type elastic cushions are installed at engine gudgeon pin end simultaneously just knows that rejection rate is zero, reassembles piston Pin and crank connecting link and system test and outlet are just dared to confirm this discovery for several years.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples.

Fig. 1 is the schematic diagram of brush cutter.

Fig. 2 is the perspective view of the explosion of the top half of brush cutter.

Fig. 3 is the perspective view of the explosion of the lower half portion of brush cutter.

Fig. 4 is the schematic diagram for removing outer cover and shield of brush cutter.

Fig. 5 is perspective view of the explosion of the brush cutter containing engine.

Fig. 6 is the diagrammatic cross-section of the carburetter body containing four bifurcated nozzles (70a) of brush grass-mowing machine engine.

Fig. 7 is the three-dimensional signal of the carburetter body containing atomizer of brush grass-mowing machine engine and carburetor assembly (F56) Figure.

Fig. 8 is the brush grass-mowing machine stereoscopic schematic diagram for having the disc cutterbar of inner cutter hole (642) and outer cutting edge (641).

Fig. 9 is the brush grass-mowing machine local overlooking schematic diagram for having the disc cutterbar of inner cutter hole (642) and outer cutting edge (641).

Figure 10 is the stereoscopic schematic diagram that outer protective cover is equipped with the long long grass pressing wheel (74) for being equal to diameter of beating the grass of its roller.

Figure 11 is the stereoscopic schematic diagram of the disc cutterbar of the belt length grass pressing wheel of brush grass-mowing machine.

Figure 12 is the stereoscopic schematic diagram of the stock of brush grass-mowing machine and disc cutterbar that band is beaten the grass.

Figure 13 is the stereoscopic schematic diagram for the disc cutterbar that the band of brush grass-mowing machine is beaten the grass.

Figure 14 is the diagrammatic cross-section of piston.

Figure 15 is to return to alter the two of the piece reduction discharge three-dimensional signal for rushing gasoline engine cylinder with scavenging road junction inclined wedge turbulent flow Figure.

Figure 16 is to return to alter the two of the piece reduction discharge partial enlargement for rushing gasoline engine cylinder with scavenging road junction inclined wedge turbulent flow Schematic diagram.

Figure 17 is to narrow double auxiliary blow vents of left and right block to reduce the two of discharge and rush the positive of the left block of petrol engine Schematic diagram.

Figure 18 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge reverse side for rushing the left block of petrol engine Schematic diagram.

Figure 19 is the stereoscopic schematic diagram of two installation sites for rushing petrol engine original left and right block.

Figure 20 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge schematic diagram for rushing the right block of petrol engine.

Figure 21 is that double auxiliary blow vents of narrowed left and right block reduce the receipts for the left and right block that the two of discharge rushes petrol engine Narrow double auxiliary blow vents close on plus the schematic diagram of the piston of double auxiliary skirt rims.

Figure 22 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge middle section for rushing the left block of petrol engine Schematic diagram.

Figure 23 is the schematic diagram of the another angle of cylinder body of the scavenging road junction equipped with technique butt strip (55).

Figure 24 is the schematic diagram of the cylinder body for the two-cycle gasoline engine that partial cut-out shows layered scavenging in cylinder.

Figure 25 is the schematic diagram for the layering gas storage piston that partial cut-out shows sectional cross section.

Figure 26 is the schematic diagram of the layering gas storage piston of partial cut-out.

Figure 27 is the schematic diagram for the layering gas storage piston that partial cut-out shows sectional cross section.

Figure 28 is the schematic diagram of the crosscutting layering gas storage piston for showing cutting cross section in part.

Figure 29 is the schematic elevation view for being layered gas storage piston.

Figure 30 is that the complete section of layering gas storage piston cuts the schematic diagram of cross section.

Figure 31 is the schematic diagram for being layered gas storage piston and crankshaft-link rod.

Figure 32 is the schematic diagram of the cylinder body for the two-cycle gasoline engine that partial cut-out shows layered scavenging in cylinder.

Figure 33 is the schematic diagram of the cylinder body for the two-cycle gasoline engine for removing butt strip and showing the layered scavenging in cylinder.

Figure 34 is the schematic diagram of conventional crankshaft-link rod.

Figure 35 is the schematic diagram for adding the crankshaft (57) and connecting rod of the c-type circle (56a) of crank valve (56).

Figure 36 is the schematic diagram for adding the cylinder body of c-type circle (56a) and two-cycle gasoline engine of crank valve (56).

Figure 37 is plus the signal of the cylinder body of the c-type circle (56a) of crank valve (56) and gap (56 δ) and two stroke engine Figure.

Figure 38 is the schematic diagram for adding the c-type circle (56a) of crank valve (56).

Figure 39 is the schematic diagram for adding the c-type edge (57a) of crankshaft (57) of crank valve (56).

Figure 40 is the schematic diagram for adding the cylinder body of c-type circle (56a) and two stroke engine of crank valve.

Figure 41 is the schematic diagram for adding the inclined wedge circle (56b) of crank valve (56).

Figure 42 is the schematic diagram for adding the pressure coil (56f) of crank valve (56).

Figure 43 is the schematic diagram of the strainer (58) in scavenging channel.

Figure 44 is the schematic diagram of the wedge (11b) of the noise abatement in scavenging channel.

Figure 45 is the schematic diagram of the another side of the wedge (11b) of the noise abatement in scavenging channel.

Figure 46 is the schematic diagram of the another side of the catalyst volume (59) of the emission reduction in scavenging channel.

Figure 47 is the diagrammatic cross-section put on piston stroking upward to scavenging port.

Figure 48 is the diagrammatic cross-section put under piston stroking upward to scavenging port.

Figure 49 is diagrammatic cross-section of the piston stroking upward to top dead centre.

Figure 50 is the diagrammatic cross-section that piston downlink is in position on exhaust outlet top.

Figure 51 is that piston comes downwards to the diagrammatic cross-section put on scavenging port.

Figure 52 is diagrammatic cross-section of the piston to lower dead center.

Figure 53 is the diagrammatic cross-section of exhaust close.

Figure 54 is diagrammatic cross-section when air entry starts to open.

Figure 55 is to add the diagrammatic cross-section of the two-cycle gasoline engine of double sieves and scavenging oral area trimmer valve in scavenging channel.

Figure 56 is a kind of noise figure of method analyzed with computer numerical computer aided simulation aerodynamic noise.

Figure 57 is the schematic diagram of two-cycle gasoline engine LPG propane container (t20).

Figure 58 is the schematic diagram of the rear side of double coarse filtration combination fine filtering buffering valve chambers.

Figure 59 is the schematic diagram of double coarse filtration combination fine filtering buffering valve chambers.

Figure 60 is the stereoscopic schematic diagram that the cutting of metal cap and outer resin cover bilayer cooling silencer in having is opened.

Figure 61 is the diagrammatic cross-section of metal cap and outer resin cover bilayer cooling silencer in having.

Figure 62 is the schematic diagram of a kind of noise reduction and the engine for reequiping G pad.

Figure 63 is the schematic diagram of the side cutting of fish scale wedge (54e).

Figure 64 is function hush tube (54d) and the schematic diagram for assisting hush tube (54g).

Figure 65 is the signal of the automated exchanged cutter positioning mechanism in put-put piston pin end while two G type elastic cushions of installation Figure.

Figure 66 is the sectional view of the piston (g31) for the deep gouge (g18) that no chamfering places G type elastic cushion (g7).

Figure 67 be have chamfering have place G type elastic cushion (g7) deep gouge (g18) piston (g31) sectional view.

Figure 68 is the schematic diagram of the side of G type elastic cushion (g7).

As shown, in figure:

1. being two cycle engine；2. being hexagon socket cap head screw M6x30；3. being hexagon socket cap head screw M5x8；4. It is 1 type hex nut M6；5. being PP wire clamp；6. being PA hanging ring；7. being 41 type non-metallic insert hexagonal locking nut M5；8. being POM hanging ring fixing seat；9. being hexagon socket cap head screw M5x20；10. connecing aluminum pipe before being11. being manipulating handgrip Assembly；12. being control handle pipe；13. being 13 band spring washer hexagon socket cap head screw M5x25；14. being pressed from both sides in hand handle fixing seat Plate；15. being hand handle fixing seat；16. being left handgrip component；17. being nitrile rubber hand handle shock-absorbing sleeve；18. being under hand handle fixing seat Clamping plate；19. being left handgrip pipe；20. being five leaf nylon tubes21. being transmission shaft22. being deep-groove ball axis It holds；23. being spring washer 6；24. being hexagon socket cap head screw M6x23；25. being aluminium tube joint；26. being locking knob；27. being to pass Moving axis connector；28. being rear aluminum pipe29. being 4 hexagon socket cap head screw M5x12；30. being 4 spring washers 5；31. being limit handle spring；32. being limit handle lock；33. being limit handle；34. being split washer 2.5；35. being protection Cover fixing seat；36. being circlip for hole 26；37. being circlip for shaft 10；38. being roundlet gear with curved teeth；39. being small arc-shaped Gear oil is stifled；40. being hexagon socket cap head screw M6x14；41. being hexagon socket cap head screw M6x10；42. being plain washer 6； 43. being gear-box；44. being great circle gear with curved teeth；45. being splined shaft；46. being deep groove ball bearing 6002；47. being circlip for hole 32；48. being gear-box shield；49. being spline pad；50. being 3 tooth disc cutterbars；51. being cutterhead pressing plate；52. being cutterhead shield；53. It is that 1 type hex nut M10 is left-handed；54. being nylon moving head；54a. is sharp sword；54b. is to cut pile to beat the grass wire；55. being back Band；56. being hexagon nut with flange M5；57. being small blade；58. being knife rest；59. being cross recessed pan head tapping screw ST4x14； 60. being interior shield；61. being shielding support；62. being hexagon socket cap head screw M5x35；63. being 2 tooth disc cutterbars；64. being Disc cutterbar；65. being 8 tooth disc cutterbars；16-1. being left handgrip；16-2. is 1 type hex-head nut M5；16-3. is cross recess coiled hair Screw M5x20；16-4. is Cross Recess Head Screw M5x30；66. being the waistband for having pallet；67. being pallet；68. being that auxiliary turns Ball；69. being catalyst hush tube；70. being the interior straight tube of atomizer；70a. is four bifurcated nozzles；71. being to there is the vortex of helicla flute to spray Oil pipe；72. being that atomizer has a parabolical horn mouth；73. being outer protective cover；73a. is screw hole location；73b. is installation card Slot；73c. is the limit of rope of beating the grass；73d. is grass pressing wheel mounting bar；73e. is arc enclosing item；74. being long grass pressing wheel；641. It is outer cutting edge；64a. is outer sawtooth；642. be inner sawtooth；74a. is the pressure grass slot cross-section of long roller grass pressing wheel；74b. is long roller Multiple pressure grass slots of grass pressing wheel；19b. is the damping adapter tube (19b) for having close circle helical spring shape；It F1. is starter assembly；F2. It is starting driver plate component；It F3. is 2 oil sealings；It F4. is right case；It F5. is 2 deep groove ball bearings；It F6. is 2 torque 7-9NM Interior hexagonal cylindrical head plain cushion screw assemblies M5 × 45；It F7. is the muffler ASSY for contacting matchmaker's hush tube (69)；It F8. is silencer Pad；It F9. is the right shock-reducing sleeve of fuel tank；It F10. is 2 retaining ring for piston pins；It F11. is piston pin；It F12. is needle bearing；It F14. is living Plug ring；It F15. is crank assemblby；It F16. is woodruff key；It F17. is cylinder block pad；It g44. is cylinder block；It F19. is 2 interior hexagonals Socket cap screw assemblies M5 × 20；It F20. is engine enclosure；It F21. is recessed pan head tapping screw ST5 × 14；It F22. is igniter Assembly；It F23. is 2 cross fluting screw assemblies M4 × 20；It F24. is spark plug；It F25. is no asbestos packing sheet mould assembling pad； It F26. is 2 mould assembling positioning pins；It F27. is left box body；It F28. is 5 cross fluting screw assemblies M5 × 25；It F29. is that magnetic flies Wheel；It F30. is clutch assembly；It F31. is clutch disk；It F32. is circlip for shaft；It F33. is the left shock-absorbing sleeve L of fuel tank (F33)；It F34. is the right shock-absorbing sleeve R of fuel tank；It F35. is inserts bearing connection seat；F36. be 3 crosses fluting screw assemblies M5 × 20；It F37. is upper clamp plate shock-absorbing sleeve；It F38. is lower clamp plate shock-absorbing sleeve；It F39. is upper clamp plate；It F40. is lower clamp plate；It F41. is 2 Interior hexagonal cylindrical head screw assemblies M5 × 18；It F42. is flame-out wire clamp；It F43. is air filter seat；It F44. is 2 air filter seat pads Set；It F45. is soft polyurethane foam filter core；It F46. is air filter pressing plate；It F47. is 2 M5 spring washers；It F48. is that 2 crosses are opened Slotted disk head bullet screw M5 × 63；It F49. is air filter lid；It F50. is cross fluting coiled hair screw assemblies M5 × 14；It F51. is 2 Air inlet pipe pad；It F52. is deflector；It F53. is polyphenylene sulfide PPS air inlet pipe；It F54. is grounding wire component；It F55. is no asbestos rubber Plate carburetor packing；It F56. is carburetor assembly；It F57. is PU yellow transparent oil return pipe；It F58. is PU black oil inlet pipe；F59. it is Oil-resistant acrylonitrile-butadirubber rubber oil pipe seat；It F60. is fuel filter assembly；It F61. is oil pipe clip；It F62. is HDPE blow molding fuel tank；F63. It is cap assembly of fuel tank；It F64. is 5-7NM hexagon-headed bolt plain cushion combination M6X14；It F65. is 4 3-5NM cross fluting combination spiral shells Follow closely M5X18；It g31. is piston (g31)；It g37. is double auxiliary skirt rims (g37)；G38 is the bottom edge (g38) of double auxiliary skirt rims；Under g39 is Fillet (g39)；It g40. is the side (g40) of double auxiliary skirt rims；It g41. is upper fillet (g41)；It g42. is the concave arc side on bottom edge (g42)；It g43. is the through-hole (g43) of piston and double auxiliary skirt rims；It g44. is cylinder body (g44)；It g45. is scavenging road junction (g45)； It g46. is that inclined wedge turbulent flow time alters piece (g46)；It g47. is that inclined wedge turbulent flow goes back to the scavenging road junction (g47) for altering piece；It g48. is logical scavenging air belt The inclined wedge (g48) of mouth；It g49. is that returning for the logical scavenging road junction that inclined wedge turbulent flow time alters piece alters grid (g49)；It g50. is logical scavenging road junction Turbulent shield (g50)；51b. is left double auxiliary blow vents (51b)；52b. is right double auxiliary blow vents (52b)；It g51. is left block； 51b. is left double auxiliary blow vents；51C. is long reinforcing rib；51d. is short reinforcing rib；51e. is reinforcement arm pawl；51f. is rear wall； It g52. is right block；52b. is right double auxiliary blow vents；53. being that two air flue walls are also known as scavenging air belt partition wall；53a. is the foot of a wall portion； 53b. is rear metope；53c. is preceding metope；53d. is wall end；53j. is Fourier function notch；54. being that tool periodic function is lucky Buss overshoot convergence wave Fourier piece wall；54j. is transition inflection point；54k. is fluctuating convex-concave；51g. is left prism；51y. is Left straight sided；51h. is left broad side surface；52g. is right prism；52y. is right straight sided；52h. is right broad side surface；31a. is storage Gas pit；31b. is crosscutting hatching；44a. is blow vent；44b. is into gas port；44c. is into air scoop；44d. is first Scavenging port；44f. is the second scavenging port；44e. is envelope high-wall；55. being technique butt strip；55g. is that interval is stupefied；55e. is that interval lacks Mouthful；55d. is the first scavenging side wall；55d. is the second scavenging side wall；44j. is perforation heat release hole；44k. is straight-through heat release hole； (44x, 44v) is to reinforce heat dissipation in flakes；56. being crank valve；56a. is c-type circle；57. being crankshaft；56 δ are gaps；57a. is C Type edge；56b. is inclined wedge circle；56f. is pressure coil；58. being strainer；59. being catalyst volume；It t20. is miniature LPG propane fuel Tank；It t20c. is tank bottom attic base；It t20d. is the base holes of tank bottom attic base (t20c)；It F7C1. is interior metal cap；F7C2. be it is interior go out Mouthful；It F7j1. is outer resin cover；(F7j2) is outer vent；It F7j3. is log channel；The nearly tool bore (28a) of 28a. aluminum pipe；54a. Resilient cushion 54a；54g. assists hush tube 54g；54d. function hush tube 54d；54e. fish scale wedge 54e；54f. variable cross-section air hose 54f；G2. skewed slot (g2)；(g1,1b) be clamping cylinder (g1,1b), g15. main body guide holder (g15), g13. anti-rotation block (g13), G8. primary push rod (g8), g16. cylinder mounting base (g16), g19 cylinder (g19), g21. cylinder push plate (g21), g20. master are servo-actuated and push away Plate (g20), g22. master are servo-actuated pulling block (g22), g23. auxiliary clamp seat (g23), g24. base (g24), g7.G type elastic cushion； G31. piston (g31).

Specific embodiment

A kind of further improved engine, exhaust outlet connection catalyst hush tube (69) of cylinder and function hush tube (54d), tubule, fish scale wedge (54e), variable cross-section air hose (54f) noise reduction for assisting hush tube (54g)；The function is eliminated the noise Pipe (54d) is the series winding at interval, and along it is approximate it is similar with reference to one third octave be the period multiple limited sines The curve of the range of decrease of the odd function of the wave train is axis；It, should not common pin hole in the entrance of the piston pin end of engine piston Chamfering (d18) be mounted directly two G type elastic cushions just without waste product.

To make up mobile jib micro the phenomenon that rocking caused by the existing mechanism of brush grass-mowing machine, one kind provided by the invention is used for The main aluminium bar of the length of the improvement of brush cutter is fastened as in catalase hush tube loading machine, and with F41 screw；Exhaust gas is set to pass through silencer Assembly and catalase hush tube 69, then by long main aluminium bar, and arranged from the gap of the close cutter of aluminium bar end or aperture gap Out.

50% or more power per liter can be improved relative to four-stroke engine with two stroke engine in brush cutter, but is discharging On to take measures；Grass-mowing machine is portable dam, it is desirable to which power is light and small；Former stock is changed to the noise elimination of more honeycombs and catalase Pipe, from distal exit；Usefulness is to change to be hovered around by the exhaust gas of the engine direct emission by person of modern times originally, portion Point exhaust gas can be sucked by engine and carburetor air inlet, and the situation that portion can be sucked by people, after catalase hush tube between The method put of running in makes to discharge low and discharge outlet far from people, safer, and emission reduction reinforcement；There is transparent shield to be more convenient for seeing It examines, the mode of operation of the new pallet waistband of brush cutter is additionally provided, when expanding operating radius, that is when encountering big filling Wood when reaching treetop, or will cut at a distance and when having puddle blocking, with the lengthening mode for engine being put into pallet waistband, make Cutterhead elongation, this also easily more stable operation.There is transparent shield, is the local transparent or all saturating on the shield of cutter It is bright, it can preferably observe and cut off and operate, reduce card resistance.There is the bush knife of periphery blade and inner circumferential blade, it will be apparent that improve Brush allows branch and card resistance.There are also the steady stock interfaces of side flange and lateral filament button, have spiral spring or wave spring and subtract The hand handle of vibration has the carburetor of inside spin whirlpool nozzle；The environmental protection of grass-mowing machine is improved with Low-emission gasoline machine and multinomial measure Quality and usability.Low-emission gasoline grass-mowing machine beats the grass wire 54b's with cutting pile it is characterized in that the cutter contains Moving head 54 is with the long-acting cutting of benefit, and the disc cutterbar 64 with inner sawtooth 642 to prevent allowing knife；And the carburetor of its engine is set Four bifurcated nozzle 70a are with benefit atomization；And the cutter is equipped with interior shield 60 and outer protective cover 73 and in its outer protection Cover is equal to the long grass pressing wheel 74 for diameter of beating the grass equipped with its roller length in order to press grass to preserve soil moisture and meadow decorative pattern, therefore its usefulness It is more.

It is set on what the moving head 54 contained by the cutter of Low-emission gasoline brush cutter was had cut pile beats the grass wire 54b There are multiple sharp sword 54a, the way of multiple point swords is to cut what pile went out under hammering with sharp plain chisel on wire.Alternatively, What the moving head 54 contained by cutter was had cut, and pile beats the grass that wire 54b is equipped with multiple sharp sword 54a, multiple point swords Way be on wire with have the plunger chip die of sharp edge cut under the impact of press machine pile go out.Pile is cut to beat the grass wire ratio Nylon wire is durable mostly, is not only conducive to long-acting cutting, few with line, saves into disk nylon wire；And it can beat the grass, moreover it is possible to straw is cut, And nylon wire cuts motionless thin bar；Beat the grass wire when cutting different objects and disc cutterbar complement each other it is each has something to recommend him.Cutter institute The outer cutting edge 641 of the periphery of the knife for 4 stretchings that the disc cutterbar 64 with inner sawtooth 642 contained is equipped with is equipped with multiple outer Sawtooth 64a, and the inner sawtooth 642 also has 4, and its every inner sawtooth 642 sets multiple sawtooth, thus it is handy.Cutting The outer protective cover 73 installed on the interior shield 60 that device is equipped with is equipped with installation card slot 73b and 2 screw hole location 73a with benefit Installation, and the limit 73c equipped with rope of beating the grass on its outer protective cover 73, and be equipped on its outer protective cover 73 for installing long pressure The grass pressing wheel mounting bar 73b and arc enclosing 73b of grass wheel 74, therefore be easily installed.Its described roller is long to be equal to diameter of beating the grass Long grass pressing wheel 74 be rotatable, the long diameter for being much larger than its grass pressing wheel of axial length, that is, roller of grass pressing wheel.Its 2 times are The diameter of beating the grass；And the long diameter of beating the grass that is equal to of long its roller of grass pressing wheel 74 then can just be pressed onto the grass just cut, therefore press grass Effect is obvious.The long long grass pressing wheel 74 for being equal to diameter of beating the grass of its roller is rotatably that axial length, that is, roller of grass pressing wheel is long-range Greater than the diameter of its grass pressing wheel, that is to say, that the axial length of its grass pressing wheel, that is, roller length is 10 times of the diameter of its grass pressing wheel, both It preserves soil moisture convenient for pressure is careless, and material-saving, and if being conducive to press due to same distance wheel footpath of advancing more carefully can roll several circles more careless.It takes turns too thick Then take material, what is also turned is excessively slow, and dash is few, rolls difference.Roller is long convenient for covering face, high-efficient；So with the pressure grass of thin length Wheel.Again because the long long grass pressing wheel 74 for being equal to diameter of beating the grass of its described roller is equipped with the careless slot 74b of multiple pressures, slot is rectangular along its roller To or straight slot or wavy curved slot；And the slot cross-section 74a or rectangular or semicircle for pressing careless slot Shape, therefore few skidding convenient for the soil moisture conservation of pressure grass and meadow embossing.Moreover the carburetor of the engine sets four bifurcated nozzles 70a refers to that on the outlet of the nozzle 70 of the inside of carburetor be four bifurcated nozzle 70a along 4 gaps are set ring week, therefore changes Good mixing combustion fluid state of the vapour through gap and be conducive to atomization；The carburetor of its engine sets four bifurcated nozzle 70a Refer to that on the outlet of the nozzle 70 of the inside of carburetor be four bifurcated nozzle 70a along 4 gaps are set ring week, it is mixed to improve It closes combustion fluid state of the vapour through gap and is conducive to atomization.Or in the carburetor assembly F56, the interior straight tube of atomizer is improved 70 be on the outlet for have the vortex spray bar of helicla flute 71 also along 4 gaps are set ring week be four bifurcated nozzle 70a, or is 3 Bifurcated, or be 5 bifurcateds, or be six bifurcateds, or be 7 bifurcateds, or be eight bifurcateds；If 1 gap or 2 gaps, then vapour is not out It is even；If 9 or more gaps, because outlet is less than 3mm, then gap is too fine and closely woven.When oil and gas is passed through in the carburetor assembly F56 The interior straight tube 70 of interior improvement atomizer has the import of the vortex spray bar of helicla flute 71 to be set as parabolical horn mouth 72 Or the horn mouth of the archimedes curve of conical section pours the interior straight tube 70 and has the vortex spray bar of helicla flute 71, It is and then squeezed out again along 4 gaps or 3-8 gap set in ring week to multi-direction dispersion from the outlet of the spray bar, and It is not only to be squeezed out from a hole to a direction, and it is multiple due to being formed by between the multiple gaps set in ring week on the outlet Piece its have the vibration back and forth trembled because of cantilever beam principle and to the steam flow effect of adding fuel to the flames, will be in the air-breathing wink of gasoline engine Between, in the aditus laryngis key position of this trunnion, it is more conducive to when accelerating fluid sharply to mix friendship atomization with the air-flow to come from air filter It polymerize contaminated product effect and diverging mixed effect, pair for the cylinder body g44 that two rush gasoline engine is entered with the carburetion state being more atomized In the scavenging road junction g45 of the left and right of title each one, then the inclined wedge turbulent flow time being equipped with through it alters piece g46 effect and enters two and rush gasoline engine Piston with cylinder body be formed by combustion chamber therefore be conducive to week and reciprocally work.The air mass flow coefficient of known carburetor is in Reynolds Number 8x (1000-100000) range is only 0.05 or so, and the discharge coefficient of main jet is with the increasing of the aditus laryngis vacuum degree of this trunnion I.e. Reynolds number is added to increase and increased dramatically so as to cause the reduction of Carburettor performace curve and mixture strength is made to tend to enriching；This Multiple of the aditus laryngis of trunnion its have the vibration back and forth trembled be more advantageous to acceleration atomization i.e. acceleration carburetion.Narrow left and right block The inclined wedge turbulent flow that the scavenging road junction g45 of double auxiliary blow vents and cylinder body g44 are equipped with, which returns, alters piece g46, and adds with the skirt section of piston Some double auxiliary skirt rims g37 three adapteds have more drop row's effect.It is the crystallization for collecting many years domestic and foreign experience and groping；There is batch The emission reduction of production effect up to standard can not only be marked up to 50 grams, and can drop to 39.9 grams, and safety coefficient is big, and waster is few, this is to big Batch produces significant.It has determined that and starts batch production in the application of two cycle engine, implies low emission in 20 years from now on The developing direction of gasoline brush cutter.The present invention relates to the noise elimination of two cycle engine improvement, there is function wave combustion chamber and float electrode Collocation, has double auxiliary skirt rims, has scavenging air belt inclined wedge piece, energy-saving and emission-reduction are up to standard, and multi-functional, and bright spot is significant；But the mankind have pursued The invention of beauty is endless, therefore spinning is repeated not to the utmost in the hope of casting a brick to attract jade.

For scavenging ventilation, in scavenging channel plus catalyst is rolled up, and adds strainer (58), if technique butt strip (55), if multiple Wedge (11b), C-shaped valve etc. style open multiple new ways in scavenging air belt energy emission reduction in two-cycle gasoline engine, although The mechanism of its atom level needs the following exploration, but it has determined that in the application of two-stroke gasoline engine scavenging air belt.

A kind of return with scavenging road junction inclined wedge turbulent flow alters piece and reduces the two-cycle gasoline engine of discharge, comprising cylinder body and Well known combustion chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, Cooling system, gas handling system, the cylinder body (44) be two-cycle gasoline engine dress piston cylinder chamber on along center The symmetrically cylinder body (44) at the scavenging road junction (45) containing left and right each one, it is characterized in that: in the symmetrical of the cylinder body (44) On the scavenging road junction (45) of left and right each one, respectively symmetrically each ground in left and right is equipped with inclined wedge turbulent flow time and alters piece (46), with benefit in scavenging At road junction generate turbulent flow come block exhaust gas return alter so as to reduce discharge.

A kind of scavenging road junction logarithmic differentiation equation turbulent flow returns the two-cycle gasoline engine for altering piece drop row, containing cylinder body and Well known combustion chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, Cooling system, gas handling system, the cylinder body (44) be two-cycle gasoline engine dress piston cylinder chamber on along center The symmetrically cylinder body (44) at the scavenging road junction (45) containing left and right each one, it is characterized in that: in the symmetrical of the cylinder body (44) On the scavenging road junction (45) of left and right each one, respectively symmetrically each ground in left and right is altered piece (46) equipped with inclined wedge turbulent flow time, and main body is pressure One section of the nearly equal logatithmic spiral by logarithmic differentiation equation of power corner connection is equal using the logatithmic spiral tool pressure angle of higher mathematics Feature then gush mixed air-flow on it as soon as returning the turbulent flow added alters section that piece has logatithmic spiral easily steadily, existed with benefit Block exhaust gas time at scavenging road junction using equal pressure angle generation turbulent flow to alter to reduce discharge.

Scavenging road junction logarithmic differentiation equation turbulent flow is taken to return the master for altering the piece of two-cycle gasoline engine of piece drop row One section of body,

Establish differential equation d ρ/d θ=k ρ:

It is equal everywhere because wanting pressure angle λ if polar equation ρ=ρ (θ), therefore tg λ=constant, tg λ=k is enabled,

By pressure angle formula tg λ=ρ '/ρ,

Just there is ρ '/ρ=k,

Differential it, just have differential equation d ρ/d θ=k ρ

D ρ/d θ=k ρ is solved, both sides integrate after variables separation:

∫ d ρ/ρ=∫ kd θ is easy to get because of ρ > 0:

Ln ρ=k θ+C,

Namely:

A therein is constant, is the primary condition of the size and CNC machine by workpiece and mold to determine.

Using PRO/ENGINEER WILDFIRE mapping software, working directory is newly set, creates part,

Parameter (PARAMETER) 1:C real number (real number) is established, it can be with being assigned between 0.01-1 according to specific operating condition Value, such as 0.3；C is also referred to as wave height.

Establish parameter (PARAMETER) 2:N integer (integer), can with according to specific operating condition between 2-100 choosing value, example Such as 13；N is also referred to as wave number.

Opening relationships (RELATION), i.e., equation is:

Logarithmic curve:

Z=0

X=10*t

Y=log (10*t+0.0001)

Produce logarithmic curve；

Followed by using rotation, merging, hypostazation etc. is instructed, and is assembled and merged with workpiece, can be modeled；

It is modeled again with the equation and PRO/ENGINEER WILDFIRE, inputs CNC machining center, used CIMATRO or MASTCAM, the punching block of pack alloy processed, or assisted with milling machine, planer and electrical spark working work；Use electric spark When processing, CNC machining center is inputted with the equation, then first to produce tungsten copper electrode, with the lathe for having three-dimensional rotation head, It is produced in batches again with die casting machine；It machines again；Or piston skirt is welded on the piece separately made.Logarithmic curve cam, intermediate work are answered Meeting.

With reference to higher mathematics Method of Mathematical Physics in Fourier function the continuous transition of rectangular wave overshoot Ji Bu The overshoot convergence wave of this phenomenon and with reference to lag theorem, shifting theorem, convolution theorem and it is single by the approximation of Fourier function Circular frequency and be unfolded be approximately the frequency spectrum gradually decayed for copying fourier series to draw it is multiple from greatly become smaller from it is thin become it is close Spike, it should be the high level overview of many actual phenomenons that mathematical physics is discribed, and engine blow-through air turbulent motion rule is not yet It should make an exception and surmount completely, should also have certain similar or inherent correlation or bring out the best in each other ought more or less use for reference it；In compression mod Shaping mould mold core on, manufacture and imitate the close and relevant Fourier function notch (53j) in inherence that is seeming and high-wall The transition inflection point (54j) on top have at least one close to 90 degree turn shape its be approximately that gibbs overshoot convergence wave is i.e. imitative rich In leaf series gibbs overshoot phenomenon draw gradually approach rectangle transition wave and be approximately that imitative fourier series are drawn Having for the frequency spectrum gradually decayed is multiple from the fluctuating convex-concave (54k) to become smaller greatly from the close spike of thin change；So that molding cylinder body is special Shaped body such as mainstay and influence air-flow.There is having for suitable linear characteristic to draw with imitative higher mathematics function and Fourier person's movements and expression It leads and the transition inflection point (54j) on the top of the Fourier function notch (53j) of damping characteristic and high-wall and imitative fourier series Having for the frequency spectrum gradually decayed drawn is multiple comprehensive to noise height from the thin fluctuating convex-concave (54k) for becoming close spike from becoming smaller greatly Frequency band, rate of explosion, compression ratio are advantageous.

With reference to higher mathematics Method of Mathematical Physics in family of parabolas equipotentiality streamline quadratic function curve shape, to point The flow direction of more gas storage of layer gas storage piston has directive significance.The side parabolic of scavenging air belt is leaned in the outside of the envelope high-wall (44e) The equipotentiality streamline of line race can use CNC numerical control processing.One section of scavenging air belt logatithmic spiral can also use CNC numerical control processing, logarithm spiral shell It has pressure angle equal advantage everywhere to line, that is, equiangular spiral, is conducive to the air motion of scavenging air belt.Two scavenging air belt interworkings, the Sweep its equal everywhere, and two of the equipotentiality streamline of the second scavenging road junction family of parabolas that have pressure angle of gas port equiangular spiral Secondary function curve shape, the Method of Mathematical Physics that higher mathematics is imitated at scavenging road junction is R&D direction, is answered with the test of high number scientific guidance It is got well than blindness is gathered together.It should be the high level overview of many actual phenomenons that mathematical physics is discribed, and engine blow-through air rule is not yet It should make an exception.

The two-stroke LPG that the equal pressure angle logatithmic spiral runner bilayer cooling of the catalyst scavenging gasoline brush cutter is eliminated the noise Engine, which is characterized in that the strainer (58) in the scavenging channel is located at beside the technique butt strip (55), the scavenging Strainer in channel is to be formed by a plurality of wire through knitting device, to breathing has filtering regulation to make between gas and crankcase in cylinder With；Noise control strainer in scavenging channel is equipped with multiple wedges (11b), and the wedge is multiple hollow six prismatics, has aperture on top, The advanced wedge compression of air-flow, then escape and expand from wedge aperture, there are noise control filtering regulation and noise elimination effect；In technique butt strip (55) in the scavenging channel beside equipped with emission reduction catalyst roll up (59), platiniferous rhodium indium iridium, to flow through gas have catalyst effect and Noise control filters regulating and controlling effect, has regular hour delay difference and isolation and noise elimination effect and obstructs adjustment effect, ingenious to slow down The discharge of pneumatic noise and HC.

The two-stroke LPG engine that the equal pressure angle logatithmic spiral runner bilayer cooling continuously improved is eliminated the noise, piston outside The gas storage pit (31a) of ad hoc left and right each one, it slightly resembles a pear in shape the gas storage pit, there is concentric reducer, at piston pin axle bed Smaller, far from larger at piston pin axle bed, the crosscutting hatching (31b) of the gas storage pit is curve, the gas storage pit Crosscutting hatching (31b) section thickness be greater than 2mm, the curve of the crosscutting hatching (31b) of the gas storage pit be throw The equipotentiality streamline of Wu Xian race, one section of streamline are that the flow function of Method of Mathematical Physics is imitated to meet Laplace's equation The quadratic function of the family of parabolas of the analytical function of harmonic function is conducive to gas storage scavenging.The equipotentiality streamline and tool of family of parabolas Logatithmic spiral has fair line and guidance and damping characteristic with imitative higher mathematics function, and synthesis is to noise high frequency band, pressure Increase ratio, compress when layered scavenging it is advantageous.The upper top of second scavenging side wall (55d) of the technique butt strip (55) is parabolic The quadratic function curve of line race is so as to the equal potential barriers with the outside of the envelope high-wall (44e) by the family of parabolas of the side of scavenging air belt The quadratic function curve shape of line coexists and forms the second scavenging road junction.Or curve is used instead with family of parabolas and logatithmic spiral.Technique The upper top of second scavenging side wall (55d) of butt strip (55) is that have the curve of logatithmic spiral equipotentiality streamline itself and the envelope high-wall The outside of (44e) coexists by the curved shape of the logatithmic spiral equipotentiality streamline of the side of scavenging air belt and forms the second scavenging road junction.Or Curve family of parabolas equipotentiality streamline or family of parabolas and logatithmic spiral adapted.Adapted is: the of the technique butt strip (55) The upper top for sweeping gas side wall (55d) is the outside of the curve of logatithmic spiral equipotentiality streamline itself and the envelope high-wall (44e) by scavenging The curved shape of the logatithmic spiral equipotentiality streamline of the side in road coexists and forms the first scavenging road junction；Meanwhile the technique butt strip (55) the upper top of the second scavenging side wall (55d) is the outer of the quadratic function curve of family of parabolas itself and the envelope high-wall (44e) Side by scavenging air belt side family of parabolas equipotentiality streamline quadratic function curve shape coexistence and formed the second scavenging road junction with Seek the comprehensive guide guiding role to gas storage scavenging.

The two-stroke LPG engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is continuously improved, It is characterized in that: the cylinder body (44) is equipped with multiple reinforcements heat dissipation in flakes (44x, 44v) between its multiple cooling fin；And it is described Cylinder body (44) is equipped with perforation heat release hole (44j) in the cross-sectional direction of exhaust outlet；And in the air inlet of the cylinder body (44) Cross-sectional direction is also equipped with straight-through heat release hole (44k), therefore often there is improvement at the place of ignoring in people.

The present invention relates to energy-saving and emission-reduction, are the two-stroke LPG engines that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, Its cylinder body (44) containing blow vent (44a), into gas port (44b), left and right each pair claim into air scoop (44c), left and right each pair The first scavenging port (44d), each pair second scavenging port (44f) that claims of left and right claimed, the outside of closed envelope high-wall is not i.e. by work Plug cylinder and be curved shape by the side of scavenging air belt, and coexist with the scavenging road junction of cylinder body by external technique butt strip (55), work Skill butt strip (55) stupefied (55g) containing interval, interval notch (55e), the first scavenging side wall (55d), the second scavenging side wall (55d), three A installation hole location and special-shaped packing, and it is formed with the scavenging road junction of cavity, piston (31) is equipped with the gas storage pit of left and right each one (31a).The equipotentiality streamline of family of parabolas and tool logatithmic spiral there is imitative higher mathematics function have fair line and guidance and resistance Damping characteristics are comprehensive, and to noise high frequency band, rate of explosion, compression, when layered scavenging is advantageous.

The two cycle engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, it is characterized in that, the present invention is in work Dead center beyond the Great Wall since piston train of dress portion moves up and makes before the ignition of mixed gas of compressed piston upper in cylinder Preparation air entry in latch-release cylinder is opened, and the gaseous mixture of fuel and air is sucked in the crankcase below piston；And due to The pressure of the burning gases for the piston upper that igniting generates, piston is mobile from top dead-centre to bottom dead centre direction and simultaneously closes off air-breathing Mouthful, the gaseous mixture in compression crankcase makes the burning gases in cylinder from opening and closing exhaust outlet in the piston upper of bottom dead center-nearby To outdoor gas be discharged while, the scavenging access being connected by crankcase with cylinder, in piston upper latch-release cylinder by Gaseous mixture is imported into the two cycle engine in cylinder by preparation scavenging port from crankcase；The design has to be filled with the valve of crankshaft-synchronous It sets, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging access is configured to normally closed；In scavenging access When the valve-closing of crankcase side, the gaseous mixture in scavenging access is allowed to burning of igniting by the flame of combustion gas, and HC is reduced Later again from crankcase to scavenging port, the crankcase side of scavenging access is allowed to be open, in the burning mixing pneumatic transmission of scavenging access While out, the gaseous mixture in crankcase closes exhaust outlet before being discharged from exhaust outlet, and here it is keep the discharge of HC significant The two cycle engine of reduction；It solves in pervious structure and the valve of the above-mentioned crankshaft same period is not because being designed, combustion gas If scavenging port is not opened also after the flame extinction of body, the flame of burning gases can make the mixing in scavenging access and crankcase Gas ignition makes gaseous mixture without supplying in normal direction cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinder When interior exhaust outlet and scavenging port is open at the same time, the unblended mixture in crankcase and in scavenging access enters from exhaust outlet In cylinder, so a part of gaseous mixture is discharged in the state of unburned from exhaust outlet, become the mixing in discharge gas The problem of gas (i.e. HC) increases；The present invention after crankcase scavenging, is being swept except the air entry exhaust outlet scavenging port The crankcase side of gas access has added opening and closing valve, and the gaseous mixture in scavenging access ignites and burns in the flame of combustion gas, And be in scavenging access and crankcase according to crankshaft and the valve of synchronizing cycle can be truncated, so the gaseous mixture in crankcase is not It can burn, while mixing of the combustion gas in scavenging access when the valve openings with the crankshaft-synchronous period, in crankcase Gas can be extruded out in cylinder, the initial stage when exhaust outlet and scavenging port are open simultaneously, the burning gases in scavenging access It is fed into cylinder, HC will not be adulterated into external discharged exhaust gas from exhaust outlet, when exhaust outlet will close, The unblended mixture continued in crankcase in spent gaseous mixture in scavenging access is fed into cylinder, so exhaust The HC amount adulterated in gas can control reduction.The valve gear having with crankshaft-synchronous is to add crankshaft on crankshaft (57) The c-type circle (56a) of valve (56), the c-type circle have a bit of opening, when a bit of opening of the c-type circle is rotated with crankshaft, and The oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, so that it is double-deck to form equal pressure angle logatithmic spiral runner Cool down the two-stroke LPG engine eliminated the noise.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of cylinder of the outer diameter apart from engine 1E39F is in 0.02- 0.08 millimeter；It is further characterized in that the valve gear having with crankshaft-synchronous, is to add crank valve (56) on crankshaft (57) C-type circle (56a) rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the c-type circle The central angle in the two sides of a bit of opening to the crankshaft center of circle is in 81-95 degree.

Usefulness of the present invention: being the gaseous mixture of compressed piston upper in cylinder near piston top dead center Before igniting, since piston train of dress portion moves up and open the preparation air entry in latch-release cylinder, in the crankcase below piston Suck the gaseous mixture of fuel and air；Its effect is to make to be vented the reduction of HC amount；Add double sieves and scavenging oral area slow in scavenging channel Rush valve.

Design key is that piston is mobile from top dead-centre to bottom dead centre direction and simultaneously close off air entry, i.e. piston length and vapour Port distance matches in cylinder, this, which is contemplated, is just not difficult to mark on the diagram, and processing is not also difficult to apply, and effect is to subtract exhaust HC amount It is few.

The described of the two-stroke LPG engine that the cooling of improved equal pressure angle logatithmic spiral runner bilayer is eliminated the noise has and crankshaft Synchronous valve gear, is on crankshaft (57) plus the c-type circle (56a) of crank valve (56), the c-type circle of the crank valve (56) have The two sides of a bit of opening are set as the inclined wedge circle (56b) at oblique angle, when the side for having oblique angle of the two sides of its a bit of opening While being rotated with crankshaft, just forming shear flow in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and reducing mutation The effect of impact, to form the two-stroke LPG engine of double coarse filtration combination fine filtering buffering valve chamber scavenging pressure reducing valve film.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws The valve gear having with crankshaft-synchronous it is characterized in that, described is held up, is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of cylinder of the outer diameter apart from engine 1E 34F is in 0.01- 0.06 millimeter；The valve gear having with crankshaft-synchronous is the c-type circle (56a) for adding crank valve (56) on crankshaft (57) Rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, a bit of opening of the c-type circle The central angle in two sides to the crankshaft center of circle is in 79-97 degree；The valve gear having with crankshaft-synchronous is on crankshaft (57) Add the rotation of the c-type circle (56a) of crank valve (56) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, The crankshaft (57) is equipped with c-type edge (57a), and it is a bit of opening with described plus crank valve (56) the c-type circle (56a) It matches.

The two-stroke LPG that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is further improved to draw It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Hole or a positioning pin or a positioning sleeve realize cooperation, and fixed with three screws.

The two-stroke LPG that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is further improved to draw It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, the song The central axes for its every side crankshaft of oblique angle that the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle of axis valve (56) are equipped with Angle in 5-27.5 degree, when the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle have the side at oblique angle with Crankshaft rotation just forms shear flow and slow drop mutation punching in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The effect hit.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the pressure coil (56f) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, when described The logatithmic spiral side of the two sides of a bit of opening of pressure coil is rotated with crankshaft, the connection in the scavenging channel of latch-release cylinder Pressure angle the logatithmic spiral influence air-flow of properties equivalent and the effect of buffering everywhere are just formed when the oral area of crankcase.

The two-stroke LPG engine that the equal pressure angle logatithmic spiral runner bilayer cooling of brush cutter is eliminated the noise is reformed, there is emission reduction work With strainer (58) is located at beside technique butt strip (55), and separately has strainer (58) to be located under scavenging channel；The filter in scavenging channel Net is to be formed by a plurality of wire of 50 mesh through knitting device, and the strainer in scavenging channel has filtration, is located at scavenging channel Under it is described separately have strainer i.e. sieve and scavenging oral area trimmer valve, double sieve, that is, strainers breathe between gas and crankcase in cylinder There is regulating and controlling effect.It is characterized in that, the innovation is near piston top dead center, compressed piston upper is mixed in cylinder Before closing gas igniting, since piston train of dress portion moves up and open the preparation air entry in latch-release cylinder, the crankshaft below piston The gaseous mixture of sucking fuel and air in case；The pressure of the burning gases of the piston upper generated again due to igniting, piston is from upper Dead point is mobile to bottom dead centre direction and simultaneously closes off air entry, the gaseous mixture in compression crankcase, in the piston of bottom dead center-nearby Above, while the burning gases in cylinder being discharged to outdoor gas from opening and closing exhaust outlet, it is connected by crankcase with cylinder The scavenging access connect, two by preparation scavenging port imported into gaseous mixture from crankcase in piston upper latch-release cylinder in cylinder Stroke motor；The design has the valve gear with crankshaft-synchronous, this valve is the scavenging access from crankcase to cylinder scavenging mouth Crankcase side be configured to it is normally closed；The mixing when valve-closing of the crankcase side of scavenging access, in scavenging access Gas is allowed to burning of igniting by the flame of combustion gas, after HC reduction again from crankcase to scavenging port, the crankcase side of scavenging access It is allowed to be open, while the burning of scavenging access is sent out with gaseous mixture, the gaseous mixture in crankcase is discharged from exhaust outlet Exhaust outlet is closed before, and here it is the two cycle engines for substantially reducing the discharge of HC；It solves in pervious structure, and on The valve of the crankshaft same period is stated because not being designed, if scavenging port is not opened also after the flame extinction of burning gases, combustion gas The flame of body can make the gaseous mixture ignition in scavenging access and crankcase, make gaseous mixture without supplying in normal direction cylinder, exhaust outlet Opening will make the opening of scavenging port cross early stage unlatching, when the exhaust outlet and scavenging port in cylinder are open at the same time, in crankcase And the unblended mixture in scavenging access enters in cylinder from exhaust outlet, so a part of gaseous mixture is in unburned state Under be discharged from exhaust outlet, become discharge gas in gaseous mixture (i.e. HC) increase the problem of；The present invention is in the air-breathing Except mouth exhaust outlet scavenging port, after crankcase scavenging, opening and closing valve, scavenging access have been added in the crankcase side of scavenging access Interior gaseous mixture ignites and burns in the flame of combustion gas, and in scavenging access and crankcase is according to crankshaft synchronizing cycle Valve can be truncated, so the gaseous mixture in crankcase will not burn, while the combustion gas in scavenging access is same with crankshaft When the valve openings of step period, the gaseous mixture in crankcase can be extruded out in cylinder, in exhaust outlet and scavenging port At initial stage when being open simultaneously, the burning gases in scavenging access are fed into cylinder, from exhaust outlet to external discharged row HC will not be adulterated in gas gas, when exhaust outlet will close, continue crankcase in the spent gaseous mixture in scavenging access Interior unblended mixture is fed into cylinder, so the HC amount adulterated in exhaust gas can control reduction；It is described have with The valve gear of crankshaft-synchronous, is on crankshaft (57) plus the c-type circle (56a) of crank valve (56), c-type circle have a bit of opening Two sides are set as the inclined wedge circle (56b) at oblique angle, when it has the side at oblique angle to rotate with crankshaft, in the scavenging channel of latch-release cylinder Connection crankcase oral area when just formed shearing and reduce mutation impact effect；The equal pressure angle logatithmic spiral runner The two-stroke LPG engine that bilayer cooling is eliminated the noise, it is further characterized in that, the valve gear having with crankshaft-synchronous, is in song On axis (57) plus the two sides of a bit of opening of the c-type circle (56a) of crank valve (56) are equipped with the pressure coil (56f) at oblique angle, when The logatithmic spiral side of the two sides of a bit of opening of the pressure coil is rotated with crankshaft, in the scavenging channel of latch-release cylinder Pressure angle the logatithmic spiral influence air-flow of properties equivalent and the effect of buffering everywhere are just formed when being connected to the oral area of crankcase；Scavenging The wedge (11b) of strainer (58) in channel is located at beside the technique butt strip (55)；Beside the technique butt strip (55) Catalyst in scavenging channel equipped with emission reduction rolls up (59), platiniferous rhodium indium iridium, has catalyst effect and noise control filtering regulation to gas is flowed through Effect, have the regular hour difference and isolation and noise elimination adjustment effect, slow down exhaust outlet from HC to scavenging channel discharge, thus It is formed in the engine for adding catalyst in scavenging channel；The equal pressure angle logatithmic spiral runner for being further improved perfect brush cutter is double-deck Cool down the two-stroke LPG engine eliminated the noise, which is characterized in that the valve gear having with crankshaft-synchronous is on crankshaft (57) Add the rotation of the c-type circle (56a) of crank valve (56) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, Between the oral area of the connection crankcase in the scavenging channel of cylinder of the outer diameter of the outer circle of the c-type circle apart from engine 1E45F Gap (56 δ) at 0.02-0.07 millimeters；It is further characterized in that the valve gear having with crankshaft-synchronous, is in crankshaft (57) on plus crank valve (56) c-type circle (56a) rotation and the scavenging channel of latch-release cylinder connection crankcase oral area and It is formed, the central angle in two sides to the crankshaft center of circle of a bit of opening of the c-type circle is in 82-92 degree.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that it contains the valve gear with crankshaft-synchronous, is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, a bit of of c-type circle is opened The central angle in two sides to the crankshaft center of circle of mouth is in 83-89 degree.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be to be matched with described plus crank valve (56) a bit of opening of c-type circle (56a)；Compression ratio is little In 11.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be to be matched with described plus crank valve (56) a bit of opening of c-type circle (56a).

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Hole or a positioning pin or a positioning sleeve realize cooperation, and fixed with three screws.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, when described The side for having oblique angle of the two sides of a bit of opening of c-type circle is rotated with crankshaft, the connection in the scavenging channel of latch-release cylinder Shear flow is just formed when the oral area of crankcase and reduces the effect of mutation impact.The two of a bit of opening of inclined wedge circle (56b) The angle of the central axes of its every side crankshaft of the oblique angle that side is equipped with is in 5-27.5 degree；Have and crankshaft it is further characterized in that described Synchronous valve gear, is on crankshaft (57) plus the c-type circle (56a) of crank valve (56), the c-type circle of the crank valve (56) have The two sides of a bit of opening are set as the pressure coil (56f) at oblique angle, when the two sides of a bit of opening of the pressure coil Logatithmic spiral side is rotated with crankshaft, is just formed at pressure angle in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The logatithmic spiral for locating properties equivalent influences the effect of air-flow and buffering；It is further characterized in that the strainer in the scavenging channel (58) be located at beside the technique butt strip (55), the strainer in the scavenging channel be by a plurality of wire through knitting device and At to breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；The wedge (11b) of noise control strainer in scavenging channel is located at Beside the technique butt strip (55), the discharge of exhaust outlet of the ingenious HC for slowing down crankcase virgin gas to scavenging channel.

It is new technology being used on brush cutter and grass trimmer by the analysis of Computer Numerical Simulation blade aerodynamic noise.

The method of computer numerical computer aided simulation aerodynamic noise analysis also on probation, with LMS Virtual lab software, It is easy to learn and use, analyzes noise source, obtain noise data and carry out noise reduction；With the method for computer aided animation aerodynamic analysis, The aerodynamic noise analysis of blade when dallying to the rotation output of engine, with CFD (computational fluid Dynamics it) simulates, method is intended to carry out " numerical experiment " by computer, reappears physical process from point of theory；In the hope of Receive the advantages of cost that has of numerical simulation is low, data are easily obtained, analyzed from point of theory problem compared with experiment with And the effect of development with computer and model, calculating cycle are constantly reduced, and calculated result is more and more accurate；To gardens machine Flow field and field of turbulent flow carry out feasibility analysis and data analysis, determine the blade of gardens machine and mowing runner is sound source, to gardens The noise of machine is simulated, and is met reality as far as possible for the simulation of the trend of noise variation, is made every effort to level of noise and experimental error exists 5% or so；Noise source and eddy current crack are set as fluid matasomatism in turbulent boundary layer and interact between blade and fluid micellar Generate and the disengaging of vortex, continuous spectrum random noise be set as the variation of flow regime to outlet flow pattern modulation and outflow fluid with Ambient atmos effect generates, and rotational noise is set as the fluid of blade drive and stator and surrounding fluid effect generate, experimental data Related with noise spectrum and the display noise energy in different frequency region, mower blade rotary air dynamics noise basis frequency meter is calculated public Formula: F=NZ/60, F are noise fundamental frequency, and N is rotating speed of flail, and Z is blade number；Do progress process: geometrical model is established, and is calculated Machine simulation, compares with experimental result, changes structure and is simulated, establishes noise model, experimental verification according to analog result；Way It is to start with from blade geometry and air duct geometry and rotating speed of flail, establishes air duct and blade CAD model, unstrctured grid ICEM is raw At, with FLUENT fluid data calculate rotating machinery in fluid calculation MRF model, consider variable velocity field and pressure field and rapids Kinetic energy obtains noise spectrum with LMS Virtual lab software, analyzes noise source, obtains noise data and carrys out noise reduction；Stable state examination Calculate parameter setting: grid is 4120000 unstrctured grids and dynamic mesh INTERFACE, and turbulence model is RANS (K- EPSILON), blade rotational speed takes 3000 revs/min, and iterative steps take 1000；The trial result has vorticity figure, pressure cloud atlas, speed arrow Spirogram, three-dimensional motion pattern, pressure contour surface figure and planar flow line chart, there are also blade CAD models to generate non-structural net for the trial result Lattice obtain important computations the result is that engine gardens machine knife speed low noise at 5700-7000 revs/min；It is described a kind of to use computer The gardens of the method for numerical value computer aided simulation aerodynamic noise analysis analyzed by Computer Numerical Simulation aerodynamic noise Its rotating speed of flail of machine is 5790 to 6999 turns per minute, with 1E28 to 1E48F type engine.

It continuously improves and two-stroke LPG engine that the cooling of perfect equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, is to drive Dynamic gardens machine；Fuel gas tank is to contain miniature propane fuel tank, miniature propane fuel tank (t20) with LPG fuel gas tank Front be equipped with pipe screw thread, the fuel is entered engine through mixed airgun controller by pipe fitting and is worked, the miniature propane combustion The front of batch can be additionally provided with safety valve so as to it is in excess of the quota when overflow and rise safety effect；The tank diameter of the miniature propane fuel tank It is then 98 millimeters small, it is replaced containing 465 grams of propane fuel by standard.Strainer in scavenging channel is located at by the technique butt strip Side, and the strainer in the scavenging channel is located under scavenging channel；It is as a plurality of wire through double thick made of knitting device Filter combination fine filtering buffers valve chamber, to breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；A plurality of wire is through knitting device Made of double coarse filtration combination fine filterings buffering valve chambers be additionally provided with the catalyst volume of emission reduction, platiniferous, rhodium, indium have catalyst to gas is flowed through Effect slows down pneumatic noise and the discharge of HC.The two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, Be characterized in: the muffler ASSY (F7) of the hush tube containing catalyst (69) is mounted on described two by the silencer pad (F8) On stroke LPG engine, the exit of the muffler ASSY (F7) is nearby equipped with the inner outlet of interior metal cap (F7C1) (F7C2), then it is outer, it is equipped with the outer vent (F7j2) and logarithm runner (F7j3) of outer resin cover (F7j1), at a distance convenient for the double-deck drop Temperature is eliminated the noise, and manpower and security are not scalded.

It continuously improves and two cycle engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise, It is characterized in that, the valve gear having with crankshaft-synchronous, is the c-type circle (56a) for adding crank valve (56) on crankshaft (57), The inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, the crank valve (56) folder of the central axes at oblique angle and every side crankshaft that the two sides of a bit of opening of the inclined wedge circle (56b) of c-type circle are equipped with Angle has the side at oblique angle with crankshaft in 15-27 degree, when the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle Rotation just forms shear flow and delays drop mutation impact in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder Effect.

A kind of further improved engine is additionally provided with strainer i.e. sieve and scavenging oral area buffering in scavenging beneath galleries Valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as 6300 turns per minute It is preferred；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately having strainer (58) to be located under scavenging channel is 180 mesh Fie screen；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, indium and dilute Earth elements have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, but first lead to The hush tube containing catalyst (69) is crossed, then by function hush tube (54d), assists the tubule of hush tube (54g), fish scale wedge Then (54e), variable cross-section air hose (54f) noise reduction are run in by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again It puts；There are regular hour delay difference and isolation and noise elimination and obstructs adjustment effect, the ingenious discharge for slowing down pneumatic noise and HC； A kind of engine of the further noise reduction, which is characterized in that its containing silica gel damping pad (54a), function hush tube (54d), Assist the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f)；The exhaust outlet of the cylinder of the engine The connection hush tube containing catalyst (69), then pass through function hush tube (54d), the tubule for assisting hush tube (54g), fish scale point Split (54e), variable cross-section air hose (54f) noise reduction；The outlet side of the hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) The variable cross-section air hose (54f) to side equipped with the silica gel damping pad (54a) and equipped with series winding；The variable cross-section air hose The inside of (54f) is equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, and edge The curve of the range of decrease of the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period be Axis；Multiple function hush tube (54d) groups, which are combined into the length of each hush tube of multistage noise elimination and caliber, to be had Variation sees that the length of each hush tube is shortened in single file and caliber is contracted step by step toward outgassing direction from front to back It is small；Each hush tube that multiple function hush tube (54d) groups are combined into multistage noise elimination is equipped with multiple fish scales Wedge (54e) and the wedge (50d) for having through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has the point of through-hole Split (50d)；The auxiliary hush tube (54g) of the collateral branch of auxiliary is additionally provided on the function hush tube (54d)；The auxiliary disappears Sound pipe (54g) is tubule, and the tubule has the wedge (50d) of through-hole；The variable cross-section air hose (54f) is variable cross-section , be at least three swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, at least three There is turn at place；The main rotating shaft line for blowing paddle wheel fan and the main rotating shaft line of the Wind Volume turbine (54c) have angle just Hinder outflow of the main noise of noise along straight central axes directly forwardly and rearwardly；What the Wind Volume turbine (54c) came out blows Wind enters on the first function hush tube (54d) being equipped with of inside and the hush tube of the variable cross-section air hose (54f) The small slot of arc and there is the wedge (50d) of through-hole first to be pressed that the multiple fish scale wedges (54e) being equipped with are equipped with Contracting comes out again and expands first order noise elimination process of just completing, the collateral branch for the auxiliary that the function hush tube (54d) is equipped with The tubule of auxiliary hush tube (54g) be for air-flow provides some outlets more and all not mix away from supervisor to further increase Noise elimination effect；The variable cross-section air hose (54f) is variable cross-section, and air-flow has compression-expansion from swollen portion bit stream to position is reduced Booster action；The variable cross-section air hose (54f) is that curved have turn to have booster action to preventing main noise from directly spreading out of；It completes The air-flow of first order noise elimination process come out from first function hush tube (54d), in the swell of the variable cross-section air hose (54f) Cavity in expand, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber and through institute State auxiliary hush tube (54g) and fish scale wedge (54e) the small slot of arc and have through-hole wedge (50d) by compression reflation And complete the noise elimination process that there is frequency variation of making an uproar in the second level；Complete second level noise elimination process from second function hush tube (54d) Air-flow out expands in the cavity of the swell of the variable cross-section air hose (54f), and through bend, subsequently into length and pipe The third function hush tube (54d) that diameter all changes and the arc through auxiliary hush tube (54g) and fish scale wedge (54e) Small slot and have through-hole wedge (50d) compression-expansion and after completing third level noise elimination process, from the air port of diminution, blowout subtracts It makes an uproar, is then discharged indirectly by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again；In the piston pin of engine piston The entrance at end, should not common pin hole chamfering (d18), the chamfering (d18) of pin hole on engine piston drawing is removed, there is hole And without chamfering, two G type elastic cushions are mounted directly, are zero with regard to rejection rate.

Did it is a kind of put-put piston pin end and meanwhile install two G type elastic cushions automated exchanged cutter positioning mechanism, though It can be used for production, but its outstanding problem to be high rejection rate.The entrance of the piston pin end of many engine pistons is broken and makes Engine piston is scrapped；Tried many schemes, groped several years it is all undesirable, but later with a unexpected method solution , here it is the entrance of the piston pin end in engine piston should not common hole chamfering, be mounted directly two G type elastic cushions just Rejection rate is zero, is used successfully to produce several years, is firmly believed, and the report present invention is now just dared, in the work of engine piston The entrance at plug pin end, should not common hole chamfering, have hole, no chamfering.Reason may be some for having the G type elastic cushion of opening With regard to skew when position contradicts chamfering (d18) of upper pin hole, so that piston is scrapped, no chamfering is all right, but in this way hair The chamfering (d18) of pin hole is removed on motivation piston drawing, who does not expect before, even if presently disclosed this is unable to the rhymed formula of chamfering Key, people may be also recalcitrant, but the entrance of the piston pin end of engine piston should not common hole chamfering, there is Kong Erwu to fall Angle, actual effect are exactly to get well unexpected, and several years without waste product.

A kind of further improved engine, exhaust outlet connection catalyst hush tube (69) of cylinder and function hush tube (54d), tubule, fish scale wedge (54e), variable cross-section air hose (54f) noise reduction for assisting hush tube (54g)；The function is eliminated the noise Pipe (54d) is the series winding at interval, and along it is approximate it is similar with reference to one third octave be the period multiple limited Fu in The curve of the range of decrease of the odd function of the leaf sine wave train is axis；In the entrance of the piston pin end of engine piston, not commonly use The chamfering (d18) of pin hole be mounted directly two G type elastic cushions.

Engine is related to energy-saving and emission-reduction, in order to pursue Science Explorations, installs two G type bullets simultaneously for engine gudgeon pin end Property pad automated production it is extremely urgent, but do excessively expensive full-automatic high-precision equipment makes enterprise be difficult to hold again The status received, spy disclose the assembly of the elastic cushion of motor-driven carry out piston and crank connecting link, are one kind in put-put piston pin End while the mechanism for installing two G type elastic cushions solve while installing the hard nut to crack that two G type elastic cushions are unable to handle；Because only Be skewed slot is opened on cylinder, therefore dexterously eliminate very much should the very complicated manipulator containing multiple servo-actuated fingers come shifting ground Clamping is not fixed the G type elastic cushion of form, not only simply, and also it is reliable, it is handy.Core technology is the angle of skewed slot.It is for many years Crystallization find out and domestic and foreign experience is practiced, usefulness is to be conducive to the auxiliary guiding of piston to be allowed to good, Assembly precision and product quality are improved, is reduced labor intensity, the popularization and application of high-volume automatic feed equipment are promoted, improves production Benefit.

Piston and crank connecting link are equipped with very big potentiality and can dig.Two are installed simultaneously in put-put piston pin end at present The automated exchanged cutter positioning mechanism and method of G type elastic cushion are also in groping, the assembly of piston and crank connecting link, in put-put Piston pin end is installed two G type elastic cushions simultaneously and is unable to handle；G type elastic cushion is installed in put-put piston pin end, substantially with hand Based on work production model, the left end of operator's piston pin that first installation piston and crank connecting link are connected together by piston pin manually To be stuck in piston deep gouge first G type elastic cushion, then again manually installation piston and crank connecting link by piston pin company To be stuck in piston deep gouge the second G type elastic cushion of the right end of piston pin together；Because G type elastic cushion is elasticity , it is to become outer diameter；The diameter of piston pin is 8mm, and the major diameter of piston deep gouge is 10mm, that is to say, that is major diameter The G type elastic cushion of 10mm is affectedly bashful with hand vice to be compressed to 8mm and pushes into making G type elastic cushion be restored to major diameter again in piston deep gouge 10mm；First G type elastic cushion in the piston deep gouge of the left end of piston pin is installed, the piston that must fill the right end of piston pin is heavy Second G type elastic cushion in slot.Not only labor intensity of workers is big, and production efficiency is low, but also usually because operation was exerted oneself Make G type elastic cushion modification greatly, or because operation exerts oneself too small excessively askew and so that G type elastic cushion is filled improper rather than just arrive Place.With the appearance of recruitment cost increased with recruitment famine, realize that put-put piston pin end installs two G type elastic cushions simultaneously Automated production it is extremely urgent, but do excessively expensive full-automatic high-precision equipment makes enterprise be difficult to bear again； How the assembly of the elastic cushion of motor-driven carry out piston and crank connecting link, seek one kind in put-put piston pin end while installing The mechanism and method of two G type elastic cushions, are one and are related to the hard nut to crack of energy-saving and emission-reduction.

A kind of automated exchanged cutter positioning mechanism for installing two G type elastic cushions simultaneously in put-put piston pin end, by being equipped with Clamping cylinder (g1,1b), main body guide holder (g15), anti-rotation block (g13), the primary push rod (g8), cylinder mounting base of skewed slot (g2) (g16), cylinder (g19), cylinder push plate (g21), main servo-actuated push plate (g20), main servo-actuated pulling block (g22), auxiliary clamp seat (g23), base (g24) is formed, and is symmetrically sequentially arranged on each ground in the two sides at middle part of base or so described Main body guide holder (g15) and cylinder mounting base (g16) and cylinder (g19)；It places at the middle part of the base and connects equipped with crank The piston (g31) of bar and piston pin is equipped with the auxiliary clamp seat (g23) of auxiliary clamp on the top at the middle part of the base； The clamping cylinder (g1,1b) equipped with skewed slot (g2) is housed in the side of the close piston of the main body guide holder (g15), The skewed slot (g2) is for being put into G type elastic cushion；It is movable in the clamping cylinder (g1,1b) equipped with skewed slot (g2) The ground insertion primary push rod (g8)；The anti-rotation block (g13) is housed on the main body guide holder (g15)；Institute The rear portion for the primary push rod (g8) stated is servo-actuated push plate (g20) equipped with the master；The movable extension of the cylinder (g19) and institute The cylinder push plate (g21) stated is connected；And the master is servo-actuated pulling block (g22) and is servo-actuated between push plate (g20) across the master Gap is simultaneously connected with the cylinder push plate (g21).

Claims

1. a kind of further improved engine, which is characterized in that the exhaust gas of engine first passes through hush tube containing catalyst (69), then By function hush tube (54d), the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f) noise reduction are assisted； A kind of further improved engine, containing silica gel damping pad (54a), function hush tube (54d), auxiliary hush tube The tubule of (54g), fish scale wedge (54e), variable cross-section air hose (54f)；Described in the exhaust outlet connection of the cylinder of the engine Hush tube containing catalyst (69), then pass through function hush tube (54d), the tubule for assisting hush tube (54g), fish scale wedge (54e), change Section air hose (54f) noise reduction；The outgassing direction side of the hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) is equipped with institute The silica gel damping pad (54a) stated and the variable cross-section air hose (54f) equipped with series winding；The inside of the variable cross-section air hose (54f) Equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, and along approximate similar Curve with reference to the range of decrease of the odd function for multiple limited sinusoidal wave trains that one third octave is the period is axis；It is described Multiple function hush tube (54d) groups be combined into multistage noise elimination each hush tube length and caliber change, from going to See that the length of each hush tube is shortened in single file and caliber is reduced step by step toward outgassing direction afterwards；Described is more Each hush tube that a function hush tube (54d) group is combined into multistage noise elimination be equipped with multiple fish scale wedges (54e) and There is the wedge (50d) of through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has the wedge (50d) of through-hole；It is described Function hush tube (54d) on be additionally provided with auxiliary collateral branch auxiliary hush tube (54g)；The auxiliary hush tube (54g) is Tubule, the tubule have the wedge (50d) of through-hole；The variable cross-section air hose (54f) is variable cross-section, at least three Place be swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, have turn at least three；It is described The main rotating shaft line of the main rotating shaft line and the Wind Volume turbine (54c) that blow paddle wheel fan has angle that the master of noise is just hindered to make an uproar Outflow of the sound along straight central axes directly forwardly and rearwardly；The blowing that the Wind Volume turbine (54c) comes out enters described become and cuts Multiple institutes that the first function hush tube (54d) and the hush tube that the inside of face air hose (54f) is equipped with are equipped with The small slot of arc and there is first compressed of the wedge (50d) of through-hole to come out and expand again that the fish scale wedge (54e) stated is equipped with With regard to completing first order noise elimination process, the auxiliary hush tube of the collateral branch for the auxiliary that the function hush tube (54d) is equipped with The tubule of (54g) is to provide some outlets for air-flow more and all not mixing away from supervisor to further increase noise elimination effect；Institute Stating variable cross-section air hose (54f) is variable cross-section, and air-flow has booster action to compression-expansion from swollen portion bit stream to position is reduced；Institute Stating variable cross-section air hose (54f) is curved to have turn to have booster action to preventing main noise from directly spreading out of；The first order is completed to eliminate the noise The air-flow of process come out from first function hush tube (54d), it is swollen in the cavity of the swell of the variable cross-section air hose (54f) It is swollen, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber is simultaneously eliminated the noise through the auxiliary The small slot of arc of pipe (54g) and fish scale wedge (54e) and there is the wedge (50d) of through-hole by compression reflation to complete second Grade has the noise elimination process for frequency variation of making an uproar；The air-flow of second level noise elimination process come out from second function hush tube (54d) is completed, It expands in the cavity of the swell of the variable cross-section air hose (54f), and through bend, is all changed subsequently into length and caliber Third function hush tube (54d) and through it is described auxiliary hush tube (54g) and fish scale wedge (54e) the small slot of arc and have logical The compression-expansion of the wedge (50d) in hole and after completing third level noise elimination process, blow out noise abatement from the air port of diminution, then pass through again The nearly tool bore (28a) of aluminum pipe more than one meter discharges indirectly far from population；It, should not in the entrance of the piston pin end of engine piston The chamfering (d18) of common pin hole, removes the chamfering (d18) of pin hole on engine piston drawing, has Kong Erwu chamfering, directly Two G type elastic cushions are installed.