CN202360212U - Two-stroke internal combustion engine - Google Patents

Abstract

The utility model provides a two-stroke internal combustion engine, which comprises an engine body, an air channel, a cleaning conveying channel and a piston. The engine body defines a crank case and a cylinder cavity, the crank case is used for sealing fuel mixture, the cylinder cavity is formed at one end of the inner diameter of a cylinder, the air channel is movably connected with the inner diameter of the cylinder, the cleaning conveying channel is connected between the crank case and the cylinder cavity and is provided with a primary conveying port connected with a secondary conveying port, the secondary conveying port is provided with a first window and a second window, the first window and the second window are spaced by an interval, an integral bridge steps cover the interval between the first window and the second window, the piston is slidably positioned in the inner diameter of the cylinder, and is provided with a channel and a piston opening, the channel is formed on the periphery of the piston, and the crank case is selectively connected with the conveying channel via the piston opening.

Description

Two-stroke internal combustion engine

Technical field

The utility model relates to a kind of two-stroke internal combustion engine.

Background technique

New air/fuel mixture stream has been adopted in the modular design of two stroke engine, is used for accomplishing air after the burning that will produce from previous burn cycle and that be retained in cylinder chamber and emits.Because relief opening also stays open during the scavenging port that is connected with crankcase is opened; Therefore, some scavengings (air/fuel mixture) can break away from relief opening, and these unburned gases break away from relief opening then; Thereby in the inflow atmosphere, this will cause producing pollution and reduce combustion efficiency.

In recent years, the scheme that has proposed many progress uses fresh mixture to fill cylinder chamber to improve, to avoid the loss of fuel.These improvement comprise the transmission channel configuration of using special geometric form; Directly import cylinder chamber will clean gas; Its purpose is to use raw mix to fill combustion chamber, when reducing the mixture of raw material loss to greatest extent, replaces the gas after burning.Be called as Shi Nile (Schnuerle) effect with regard to how cleaning the pattern that gas directly imports cylinder chamber better.

Another system of the loss that reduces the raw material mixing to greatest extent that the utility model is described is called as " air head ".Such system is included in a spot of air that will before introduce before the importing air/fuel mixture and is incorporated into cylinder chamber.Often use after after this theory, proposing be in cleaning gas, provide a large amount of air with the gas after discharging burning.A large amount of air is followed the action of air/fuel mixture.This method also is called as the layering cleaning.The layering cleaning comes from the later stage in the 1800's, in Mr. Douglas work, is mentioned that he also is the founder of two stroke engine, and he has founded the thought of " air head ", and its core purpose is to increase the combustion efficiency of transmitter.Only after the later stage eighties 19th century, because the pressure of regulator, producer begins to manage to reduce discharge amount.Then, the layering cleaning occurs as one of first-selected system that realizes these targets.

The basic principle of layering cleaning is well-known.In recent years, be included in the relevant development of layering cleaning and inject air suitable opportunity, the performance and the discharge amount of control motor provide an amount of air, and correction air is directed to the route of flowing through in the cylinder chamber, and control air opportunity of introducing and penetrating.Controlled by the piston that uses leaf valve or channel outlet the opportunity that air is introduced and penetrated.

Research shows, uses a plurality of cleaning ports than only using a pair of port that better layering will be provided.In addition, hope at first a large amount of air to be imported to apart near the port the exhaust port (one-level port).This will set up air curtain between the air/fuel mixture that penetrates from the level ports away from relief opening.

The model utility content

The purpose of the utility model provides the motor of a layering cleaning, and it will introduce the air head of predetermined effective amount at reasonable time with the direction of expectation.

Two-stroke internal combustion engine comprises:

An engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

A reciprocating adaptively bent axle, it is connected to piston through connecting rod, and bent axle provides counter weight above that;

An air passageways, it is connected with what flow with cylinder is interior;

A cleaning transmission channel; It connects between crankcase and cylinder chamber; It has an one-level transmit port that is connected with Secondary Transmit port, and Secondary Transmit port has the second dead end mouth of first and apart, wherein crosses over the space through bridge;

A piston; Slidably be positioned in the cylinder bore diameter, it has one or the passage in the piston periphery formed more, is used for optionally crankcase being connected with the air supply passage; It has a piston opening, is used for optionally crankcase being connected with transmission channel;

Its air flows through air passageways, through piston channel, gets into second window of Secondary Transmit port then then; Pass through first window of Secondary Transmit port then, and get into the one-level transmit port, there; Because piston moves towards the top dead central position, air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber; Because piston slides towards the bottom dead central position; When bridge stops being connected between piston opening and the Secondary Transmit port, in a part of process of the cylinder cycle period of piston before sliding in the bottom dead central position, at crankcase; There is whole connections between second window of piston opening and secondary transport passage; Therefore, following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

Further, the outside that is positioned at body of transmission channel wherein, and have a lid on it and be used to provide the transmission channel of keeping a sealing.

Further, air passageways wherein comprises two air clearances, and further, wherein, piston comprises two passages, each passage constitute itself and corresponding air clearance alignment relative.

Further, wherein piston comprises two passages, and wherein first passage is used to provide the selectivity alignment of the air passageways in the engine wall, and second passage is used to provide first window of level ports and the alignment between the one-level port.

Further, wherein, between one-level transmit port and the Secondary Transmit port through being connected with opening between the level ports passage in the uppermost part of one-level port catheter.

Further, wherein the interval between first window and second window generally is the area that equates.

Further, wherein one of piston window of being opened on first and second apart generally has equal area.

Further; Wherein, Transmission channel is connected with crankcase through a lower transmission channel window, and further, wherein; The slit of enough sizes that can allow the transmission channel window that enough fluids flow through lower is provided between lower transmission channel window and counter weight, has kept the crankcase volume minimum dimension simultaneously.

Two-stroke internal combustion engine comprises

An engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

A reciprocating adaptively bent axle, it is connected to piston through connecting rod, and bent axle provides bent axle breeding above that;

An air passageways, itself and mobile being connected of cylinder bore diameter;

A cleaning transmission channel, it connects between crankcase and cylinder chamber, and it has an one-level transmit port that is connected with Secondary Transmit port;

A piston; Slidably be positioned in the cylinder bore diameter, it has one or more passage that is formed on the piston periphery, is used for optionally level ports being connected with first port; It has a piston opening, is used for optionally crankcase being connected with transmission channel;

Its air flows through air passageways, through piston channel, gets into Secondary Transmit port then then; The piston opening is passed through in the back again, and gets into the one-level transmit port, there; Because piston moves towards the top dead central position, air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber; Because piston slides towards the bottom dead central position; At crankcase, there is whole connections between piston opening and the secondary transport passage, therefore; Following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

Further, the outside that is positioned at cylinder bore of transmission channel wherein, and have a lid on it and be used to provide the transmission channel of keeping a sealing.

Further, air passageways wherein comprises two air clearances, and further, wherein, piston comprises two passages, each passage constitute itself and corresponding air clearance alignment relative.

Further, air passageways wherein comprises two air clearances, and further, wherein, piston comprises two cover passages, and a cover passage is aimed at corresponding air clearance relatively; The second cover passage is aimed at level ports and one-level port relatively.

Further, wherein, in general, one of window of the piston opening and first or second space interval has equal widths.

Further; Wherein, transmission channel is connected with crankcase through a lower transmission channel window, and further; The slit of enough sizes that can allow the transmission channel window that enough fluids flow through lower wherein, is provided between lower transmission channel window and counter weight.

Two-stroke internal combustion engine comprises:

A) engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

B) air passageways, itself and mobile being connected of cylinder bore diameter;

C) cleaning transmission channel, it connects between crankcase and cylinder chamber, and it has an one-level transmit port that is connected with Secondary Transmit port;

D) piston slidably is positioned in the cylinder bore diameter, and it has a passage that is formed on the piston periphery, and it has a piston opening, is used for optionally crankcase being connected with transmission channel;

E) its air flows through air passageways, through piston channel, gets into Secondary Transmit port then then; Get into the one-level transmit port then, there, because piston moves towards the top dead central position; Air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber, because piston slides towards the bottom dead central position; At crankcase, there is whole connections between piston opening and the secondary transport passage, therefore; Following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

Further, wherein, an air inlet port is connected with crankcase, so that the fuel mixture in it passes through, further, wherein air passageways is positioned between the top of air intake ports and body.

Further, transmission channel wherein is positioned at the outside of body, and has a lid on it and be used to provide the transmission channel of keeping a sealing.

Further, wherein Secondary Transmit port has one first second window with space interval, and wherein the one bridge has been crossed over interval wherein, and wherein

Said bridge stops being connected between piston opening and the Secondary Transmit port; In a part of process of the cylinder cycle period of piston before sliding in the bottom dead central position; At crankcase, there is whole connections between second window of piston opening and secondary transport passage.

Further, wherein, one of window of the piston opening and first or second space interval has equal widths.

An embodiment according to the utility model; The utility model provides a kind of motor, and it utilizes the port of configuration, at first near exhaust port, sets up air curtain; Utilize the thought (cleaning circulation) of Shi Nile (Schnuerle) that fuel mixture is imported in the cylinder chamber; Configuring ports allows to set up barrier in the front of exhaust port, simultaneously, the gas around the cylinder is imported to discharge the gas after burning.

The port arrangement of the utility model provides in time discharges a large amount of air from the firsts and seconds exhaust port, from port, discharge a large amount of air/mixture then.In the operating process in an embodiment of the utility model, pressurizeed in advance, because it always is connected through what flow with crankcase apart from the transmission channel that relief opening is nearer; And have only when piston in primary importance (bottom dead center central position), and its crankcase that is connected to through flowing not also is; Block; The secondary transmission system is the crankcase that is connected to through surging, and at this moment, piston is in the second place (top dead centre position).Two ports are discharged to the air head in the cylinder chamber, because the one-level port pressurizes in advance, it is done at first like this, level ports exhaust then.In these two ports, air/fuel mixture is being followed air movement.

When the transmission channel window (port) of precharge is opened by the edge of piston head; The fluid that holds in it can be discharged in the transmission channel immediately; And in the secondary transmission channel, block the gas in space from the needs filling that crankcase comes out, move towards the port of opening then.This opportunity is poor, will allow before fuel penetrates, and the air that holds in the one-level transmit port at first gets into the cylinder chamber circulation, arrives level ports then.In an embodiment of the utility model, under the situation of normal engine speed, the time difference is about 0.0002 second.Through promoting or reduce the top edge of the port that is mutually related, can accomplish the typical delays transmit port and penetrate.From the delay that transmit port penetrates, can be caused negative effect at air or fuel/air by so-called blow gas.When the pressure of cylinder inner cavity is higher than the pressure of crankcase, this phenomenon can take place.This will cause combustion gas to open first port.This negative effect meeting caused the height that is difficult to the prediction port and the time of discharge.

Must be pointed out also simultaneously that the long passage that several producers all attempt perhaps to pass through the piston backplate through the outer conduit from air filter is near near the port the relief opening.These methods have increased the width of motor, or have increased the weight of piston, because the undercutting that is difficult to dug out by traditional die-casting system core that lower peripheral channel produces on inwall.The configuration of the motor of the utility model design can make air can be by towards near the one-level cleaning channel transfer of closing on the relief opening under the condition that does not need outer conduit.The characteristic that designs in the utility model makes its die casting manufacturing more easily.

The engine configurations of the utility model connects crankcase and combustion chamber through using a kind of port that blocks and the vertical tube in the length of cylinder bore diameter outside.One denier air has arrived the port that blocks, and air circulates in the one-level port through the opening at the top of transmission channel side cover.The negative pressure that air circulates in the one-level port by the existence in the crankcase drives.Interchangeable, also can use the inner passage of a piston backplate to accomplish same purpose.

One of purpose of the utility model provides and is used for suitable opportunity the air head is discharged into cylinder chamber, thereby improves the efficient of motor, keeps the loss of minimum original hydrocarbon simultaneously.

Another purpose of the utility model is to utilize relative less elements, and a kind of layering cleaning motor is provided.

Another purpose of the utility model has provided the configuration of two stroke engine; Can transmit air/fuel mixture to greatest extent; When further reducing the hydrocarbon loss of raw material, can provide abundant pure air to enter into the cylinder chamber with the specific power that increases motor.

Description of drawings

With reference to following accompanying drawing and description of drawings, combine with better at this and to understand the utility model:

Fig. 1 is the front view according to an embodiment's of the utility model two stroke engine;

Fig. 2 is the left view of the motor shown in Fig. 1;

Fig. 3 is the sectional drawing of the motor DD along the line shown in Fig. 1;

Fig. 4 is the sectional drawing of the motor EE along the line shown in Fig. 2;

Fig. 5 is the sectional drawing of the motor HH along the line shown in Fig. 1;

Fig. 6 is the sectional drawing of the motor GG along the line shown in Fig. 2;

Fig. 7 is the front view of the engine cylinder shown in Fig. 1;

Fig. 8 is the sectional drawing of the cylinder AA along the line shown in Fig. 7;

Fig. 9 is the left view of the cylinder shown in Fig. 7;

Figure 10 is the sectional drawing of the cylinder DD along the line shown in Fig. 9;

Figure 11 is the sectional drawing of the cylinder EE along the line shown in Fig. 9;

Figure 12 is the worm's eye view of the cylinder shown in Fig. 7;

Figure 13 is the perspective view of the cylinder shown in Fig. 7;

Figure 14 is the front view of the engine piston shown in Fig. 1;

Figure 15 is the sectional drawing of the piston AA along the line shown in Figure 14;

Figure 16 is the side view of the piston shown in Figure 14;

Figure 17 is the front view according to another embodiment's of the utility model cylinder;

Figure 18 is the left view of the cylinder shown in Figure 17;

Figure 19 is the perspective view of the cylinder shown in Figure 17;

Figure 20 is the sectional drawing of the cylinder AA along the line shown in Figure 18;

Figure 21 is the sectional drawing of the cylinder BB along the line shown in Figure 18;

Figure 22 is the sectional drawing of the cylinder CC along the line shown in Figure 18;

Figure 23 is the plan view according to an embodiment's of the utility model lid;

Figure 24 is the sectional drawing of the lid EE along the line shown in Figure 23;

Figure 25 is the side view of the lid shown in Figure 23;

Figure 26 is the worm's eye view of the lid shown in Figure 23;

Figure 27 is the perspective view of the lid shown in Figure 23;

Figure 28 is the worm's eye view according to an embodiment's of the utility model side cover;

Figure 29 is the side view of the lid shown in Figure 28;

Figure 30 is the perspective view of the lid shown in Figure 28;

Figure 31 is the perspective view according to an embodiment's of the utility model two stroke engine;

Figure 32 is the sectional drawing of the motor shown in Figure 31, wherein shows piston of engine and is in top dead centre position;

Figure 33 is the perspective view of motor shown in Figure 32;

Figure 34 is the sectional drawing of the motor shown in Figure 31, wherein shows in the process that the cleaning port is opened, and bent axle is in general 120 position (ATDC);

Figure 35 is the sectional drawing of the motor shown in Figure 31, wherein shows bent axle and is in the bottom dead center central position;

Figure 36 is the sectional drawing of the motor shown in Figure 31, wherein shows general 120 degree before bent axle is at the top dead center, closes the cleaning port;

Figure 37 is the sectional drawing of the motor shown in Figure 31, wherein shows general 60 degree before bent axle is at the top dead center, closes the cleaning port;

Figure 38 is the perspective view according to a cross section of embodiment's motor of the utility model;

Figure 39 is the perspective view according to embodiment's engine piston of the utility model;

Figure 40 is the perspective view according to a cross section part of the cylinder of embodiment's motor of the utility model, wherein shows air deflection means and is used for the cleaning fluid is imported to correct direction;

Figure 41 is another sectional view of cleaning window, wherein shows the structure that the cleaning flow direction is provided;

Figure 42 is the perspective view according to embodiment's engine cylinder part of the utility model;

Figure 43 is embodiment's motor according to the utility model, shows the sectional view of cleaning passage;

Figure 44 is according to the part perspective view of the cylinder of embodiment's motor of the utility model, wherein shows horizontal lid;

Figure 45 is the partial cross section perspective view according to embodiment's motor of the utility model;

Figure 46 is the partial cross section perspective view according to embodiment's motor of the utility model, wherein shows through secondary cleaning pipeline to connect the port that blocks;

Figure 47 wherein shows the configuration of transmission window according to the partial cross section perspective view of the cylinder of embodiment's motor of the utility model;

Figure 48 is the perspective view according to embodiment's motor of the utility model, has wherein omitted some traditional characteristic in order to increase clearness;

Figure 49 is the front elevation according to the engine block among the replaceable embodiment shown in Figure 48;

Figure 50 is the rear view according to the engine block among the replaceable embodiment shown in Figure 48;

Figure 51 is the side view according to the engine block among the replaceable embodiment shown in Figure 48;

Figure 52 is the side view opposite according to the view shown in Figure 51;

Figure 53 is the sectional view according to the engine block among the replaceable embodiment shown in Figure 48;

Figure 54 is the perspective view that is used in the piston in the replaceable mode of execution shown in figure 48;

Figure 55 is the side cross-sectional view according to the piston shown in Figure 54;

Figure 56 is the perspective view according to the transmission channel lid that uses in the motor shown in Figure 48;

Figure 57 is the side view inner according to the transmission channel shown in Figure 56;

Figure 58 is according to motor shown in Figure 48, the sectional view when it is in top dead centre position;

Figure 59 is according to motor shown in Figure 48, the sectional view that it is in 124 after the top dead centre position when spending;

Figure 60 is according to motor shown in Figure 48, the sectional view that it is in 70 after the top dead centre position when spending;

Figure 61 is according to motor shown in Figure 48, another sectional view when showing it and being in 70 after the top dead centre position and spending;

Figure 62 is according to motor shown in Figure 48, shows the sectional view of the process that moves towards the bottom dead center central position when piston;

Figure 63 is according to motor shown in Figure 48, shows the sectional view when it is in the bottom dead center central position;

Figure 64 is the zoomed-in view according to the view shown in Figure 63;

Figure 65 is according to motor shown in Figure 48, shows the worm's eye view of engine block;

Figure 66 is according to motor shown in Figure 48, shows the sectional view of the process that piston moves towards top dead centre position;

Figure 67 is according to motor shown in Figure 48, shows piston and is in preceding 70 degree in top dead center;

Figure 68 is another sectional drawing according to the view shown in Figure 67;

Figure 69 is the perspective view according to the further embodiment's of the utility model piston;

Figure 70 is the side view according to the piston shown in Figure 69;

Figure 71 is the plan view according to the piston shown in Figure 69;

Figure 72 is the side view according to the piston shown in Figure 69;

Figure 73 is a kind of perspective view of hand tools, especially a kind of chain saw, and its motor of using is shown in whole accompanying drawings.

Embodiment

The utility model provides a kind of motor, it comprise traditional two stroke engine shown in accompanying drawing in all primary elements.According to first kind of mode of execution, referring in particular to the accessory that fixes on motor in the whole accompanying drawing here is 10.Piston 21 is configured in cylinder 22, move reciprocatingly, and cylinder 22 has the supporting part 28 of a crankcase 25 and main bearing.A crankcase cap 23 covers on the bottom opening of cylinder 22; When on the opening surface of cylinder 22, being connected with outer body 25; Crankcase cap 23 has constituted crankcase 24 or internal chamber; Attached on the bent axle 26, an end of bent axle is a flywheel 20 to piston 21 through attachment post 27, and it has a plurality of cooling fins and one group of magnet.

Crankcase 25 comprises the crankshaft main bearing supporting part 28 shared with the crankcase cap, and is as shown in the figure.Cylinder 22 has defined a combustion chamber 18, and upper wall through cylinder 22 and the outer wall through cylinder 22 are connected to combustion chamber 18 through what flow, thereby form spark plug opening 29.The cylinder wall of cylinder 22 has defined surface 32, and this surface has defined cylinder bore diameter.31, one exhaust passages 33 of ingress port window and an exhaust port window 34 that 30, one in ingress port passage stretches to cylinder wall 32 are opened in cylinder bore diameter.Air window 41 and cleaning port window 35,37 are also opened in cylinder bore diameter.Left side one-level port window 35 and right side one-level port window 36, left side level ports window 37, and right side level ports window 38 have also been comprised in the air cylinder structure.Parallel with ingress port passage 30 is air inlet passage 39 and 40 (left side and right).The cleaning port channel is defined by the passage of the outer surface that is formed on cylinder and laterally covers.Accordingly, left and right sides air inlet window 41 and 42 is set in the cylinder wall.One sidewall of cylinder is provided with one-level transmission channel 51 and 52 and the part of secondary transport passage 53 and 54, by the rising wall 43 on the one-level port section and 44 and 47 and 48 specified boundaries of level ports part.

The transmission channel side cover 49 of cylinder transmission channel wall and coupling and 50 gangs form one- level transmission channel 51 and 52, and secondary transport passage 53 and 54.In the sandwich structure between transmission channel lid 49,50 and the transmission channel wall, be provided with seal arrangement (not providing reference character), these passages are to illustrate at Figure 17-22.

With reference now to Fig. 6,, transmission channel lid (right lid 49, left side lid 50) has the identical wall that cooperatively interacts with the wall of cylinder transmission channel.The appropriate section of firsts and seconds transmission channel is set between these walls.The sectional area of each passage equals the area of corresponding ports window at least.Net sectional area is very important, because it has influence on the air quantity of crankcase compression ratio and storage.Lid 49,50 can be changed into Any shape, and feasible configuration to guide cover can provide best cleaning circulation.On the top of lid 49,50, be and the zone of one-level transmission channel window 35 and 36 cooperations of secondary transport bands window that the there provides nozzle arrangements 100, takes in the guide effect of the gas of cylinder chamber with further influence.And, on the top of transmission channel lid 49,50, can observe the air window, also promptly, an opening that is connected with secondary transport passage 53 with one-level transmission channel 51, air window allow the connection of flowing between crankcase and air inlet hole.

In case be combined in together, cylinder 22 and transmission channel cover 49 and 50, formation are comprised the cylinder assembly of all elements noted earlier.The outer surface of cylinder wall will comprise the cooling rib 200 along needed area distribution.

Piston 21 is shown in accompanying drawing 14 to 16,39.It comprises as a primary element that typical two stroke engine had, for example, and piston head 201, piston ring groove 202 of fixed position piston ring (not shown) etc. forever.Piston backplate 204, piston shaft supporting part 205.Be arranged on piston backplate both sides the bottom be a piston left side, right transmission channel 206 and 207. Piston opening 208 and 209 is positioned in through on the passage of piston and be configured to accept the support of bearing.

Every other parts on this motor are all closely similar with typical parts.Sole exception be import system, it will have a Carburetor, be used for the control of air/fuel mixture and be used for the air control throttle body that pure air imports control, the Carburetor that perhaps both is combined.

Can understand the utility model better through operation as described below:

In general, cylinder has two groups or two pairs to transmit or the cleaning port.First group (level ports) is configured as blocking port and second group (one-level port).These two ports are all only just opened towards crankcase under following condition, and this condition is to open the cleaning port window when piston, are generally 20 degree behind Exhaust Open.During this period, window 208,209 is connected with the bottom of blocking port of crankcase through piston wall.Under this mode, between cylinder chamber and crankcase, set up connection through fluid.Second group (the one-level port is connected with crankcase is continual).

As stated, second group of cleaning port comprises from the cylinder chamber and extends to crankcase, and be in the following conduit of the lowermost portion of cylinder bore diameter.These conduits are constantly to be connected with crankcase.When piston near BDCP (bottom dead center central position) (greatly about opening exhaust port 20 degree back), foundation and cylinder chamber is connected when opening transmission or cleaning window.

These two groups cleaning ports co-operation as follows: when piston is in it towards between the rising stage of TDCP (top dead center central position) operation, the volume of crankcase increases, thereby produces vacuum.This vacuum provides fuel to get into crankcase through air intake ports, also provides through air port and has imported air.At about 80 degree BTDC (before the top dead center), the piston backplate will be opened towards the air intake ports of crankcase.In addition, when piston is in it towards between the rising stage of TDC (top dead center center) operation, vacuum is transferred to the second couple's (one-level port) the inside of the pipeline of cleaning port.On the top of these conduits a connecting passage is arranged, be used at these pipelines and block the connection of flowing between the port (level ports), at this moment, because it is to be covered by the piston backplate fully, so it is the space of a sealing.In this process, vacuum also is passed to blocks port.When piston 21 was near TDCP (top dead center central position), a chamber 206 is arranged at the bottom of piston 21, and was overlapping between its air port in edge that blocks port and cylinder wall.When this overlapping generation, from the air passageways that is vacuum transferred into of crankcase.When this thing happens; Air in the guidance system, wherein guidance system possibly be that a kind of special twoport footpath Carburetor possibly be other guiding device maybe, through air passageways; Arrive then and block port, and drawn through secondary one-level scavenging port and to enter into crankcase.

The appearance of this process has utilized connected system between two ports, the passage that passage top cover or piston backplate are inner.

This system can carry out balance through such mode, and the air stream that promptly enters into the small volume of crankcase can be filled the firsts and seconds transmitting catheter, because this proportion that will account for mixture to the air/fuel in crankcase has adverse effect.

When piston towards BDCP (bottom dead center position) when beginning to descend, the mixture that enters in the crankcase is pressurized, in case transmission window is opened, is contained in the one-level transmitting catheter and the air that blocks in the conduit is shot in to cylinder chamber.Such air quantity is called as " air head ", and it is following the air-flow that is made up of air/fuel mixture.When combustion gas were passed through exhaust port discharge or cleaning place cylinder chamber, the air head can stop escaping of a large amount of air/fuel mixtures.

The one-level port has been set up towards the rear and the top enters into the main air stream of cylinder.After several milliseconds, level ports ejects a fraction of air, secondly is air/fuel mixture, makes progress through the top of piston.

Now can be with reference to Figure 32, figure TDCP (top dead centre position) shows engine piston and is in the TDCP position.In this stage, order about lower piston by replacement downwards in the power of combustion gas.The bottom of the left part of backplate has been opened the suction port that fuel is pushed into crankcase chamber fully.In addition, the right portions of backplate has covered exhaust port.The air passageways that forms around the piston backplate has covered Secondary Transmit port.The inner existing negative pressure of crankcase has been created suction process at one-level crankcase window port.Said suction process is transferred to the top part of transmission channel lid through transmission channel, there, is provided with the window that connects level ports and one-level port.Through this connection, breathing process is transferred to Secondary Transmit port then.

Secondary Transmit port matches with lower half portion of part piston transmission channel.These transmission channels also with the cylinder wall in the air passageways window match.Through the connection means that flow, the suction that is transferred to Secondary Transmit port also is delivered in the air passageways, and air is driven in the one-level transmission channel.

Figure 34 shows the position of piston 21 at 125 ATDC.Because combustion gas promote piston towards BDCP, the air inlet port is closed on the base of backplate, and begins one-period compressed mixture in the end.Meanwhile, piston exposes the part of relief opening, allows combustion gas to go out cylinder chamber.The transmit port window is about to be opened.Getting into crankcase chamber chamber fuel mixture is compressed.Air compressed/fuel mixture also compresses through the air in the one-level transmit port of crankcase mouth port.This moment, the upper end-hole window was closed by the piston external wall.

Figure 35 shows the position of piston 21 at 21 BDC.Will what happened in the clear motor of this stage theory, and gas dynamics will be when piston 21 arrives the position of 21 BDC, and generation after transmit port is opened.At first, exhaust port partially opens, and transmit port is closed.This position is about 125 degree behind tdc position normally.If motor with the speed rotation of 8000RPM, only needs cost can open transmit port in about 0.001 second fully and stay open about 0.002 second.During this period of time, the air that is contained in the transmission channel that has pressurizeed is injected in the cylinder chamber.Be centered around the parameatal air/fuel mixture of piston and finally be discharged to Secondary Transmit port, after the air that comes out from the one-level port window had begun circulation, air/fuel mixture was released in the Secondary Transmit port window.The rest parts air allows to postpone in this port.The related method thereof of this delay air/fuel discharging is the core concept of the utility model, and its essence spirit is through not increasing the complexity of motor, and avoids dynamic (dynamical) complexity of blow gas to realize.In theory, from the air quantity of one-level port ejection near the cylinder chamber and exhaust port near the formation circulation.Following air/fuel mixture air-flow is followed identical path, replaces towards exhaust port " air head ".When exhaust port was closed finally, the gas of most of process mainly was pure air.This has reduced the air/fuel mixture that gets into exhaust port to greatest extent, has therefore reduced the discharging of hydrocarbon.

Referring now to Figure 36, after Figure 125 BTDC shows piston 21 and just closed exhaust port, created a vacuum at the crankcase inwall.Air/fuel mixture at piston head begins to be compressed.

Referring now to Figure 37, wherein 60 the degree BTDC position display piston 21 in the moment of opening the air inlet port.The air-fuel mixture that comes out from Carburetor begins to be involved in crankcase.Air compressed/fuel mixture increases.

Referring now to Figure 32, wherein show piston and be in the TDCP position.Owing to limited the inlet that enters into the establishment of Carburetor Venturi tube and throttle valve, still exist in the vacuum of crankcase.In this, the passage in the piston utilizes the one-level transmit port to be connected with air passageways, and uses fills with air, and this process repeats.Simultaneously, the air compressed fuel mixture is lighted, and piston is ordered about towards the BDC position by external force and moves.

According to another preferred embodiment of the utility model, like two stroke IC engine 110 in the configuration of the difference shown in Figure 48-67.In specific details, as shown in Figure 48, motor 110 comprises one individual 112; Exhaust port 150 is used for the fuel that has consumed is discharged to external environment, and spark plug opening 159 quality award from the ministry choosing within it has a threaded insert; Be used to receive spark plug, cooling rib 152 is used for heat radiation, and bent axle 154 is used to provide rotary-piston; This piston is connected with connecting rod, and to accessories such as for example centrifugal clutchs power output is provided.A transmission channel lid 160 also is provided, in accompanying drawing subsequently, reference numbers has been discussed.

Shown in accompanying drawing 49-52, body 112 comprises air inlet port 148, is used for air/fuel mixture provided entering in the engine block 112.A plurality of air passagewayss 122 also are provided simultaneously, and they are the layout of lateral separation configuration preferably.A cleaning transmission channel is provided, and shown in accompanying drawing 48, the cleaning transmission channel is transmitted 160 coverings of passage lid.Be connected between the cylinder chamber 116 of cleaning transmission channel 124 formation in crankcase 114 and engine block 112.Transmission channel 124 has an one-level transmit port 126, and it has connected the Secondary Transmit port 130 that comprises one first window 132 and second window 134 spaced apart.The space of definition is a bridge 136 between first window 132 and second window 134, and this also preferably provides.Crankshaft bearing axle journal 156 is configured to rotatable reception bent axle 154.The bottom 125 of transmit port window is provided to the bottom of one-level transmit port 126, and likewise, the top 126 of transmit port window is provided to the top of one-level transmit port 126.Accompanying drawing 52 is the sectional drawings that engine block 112.Accompanying drawing 53 has shown the relation between transmit port 125,127 level ports 132,134 inner with being formed on cylinder bore diameter 120.

As shown in Figure 54 and 55, piston wherein is provided, and piston cylinder bore diameter endoadaptation property do reciprocal vertical motion.The piston 140 of the utility model has many identical characteristics with traditional piston; Comprise a traditional piston dome 151; Piston ring groove 149 is used to receive the compression or the scraper ring of piston, and wrist pivot pin opening 147 is used to receive the wrist pivot pin and piston 140 is connected to attachment post.In addition, piston 140 comprises a passage 142, is used for the air that in air passageways 122, receives transmission channel being provided.Shown in Figure 54, passage 142 is directed like this to be provided with so that the part of huge cross section

Be called illustration, (major part on the left side in Figure 54) towards and be connected with air passageways 122.This illustration has a bigger longitudinal length, can make piston 140 when the internal vertical of cylinder bore diameter 120 moves, allow long air inlet.As shown in Figure 54, passage 142 is arranged on the place farthest, right side apart from distal end, and the part of passage is used for being connected with one of first window 132 of level ports 130 or second window 134.As shown in the figure, generally corresponding by the area of the passage 142 of the left side definition that is arranged on the curved portion in the middle of the passage with one of first window 132 of level ports 130 or second window 134.Piston opening 146 is defined in the piston 140, and piston opening 146 also has an area, and is generally corresponding with one of first window 132 of level ports 130 or second window 134.Piston opening 146 provides the optionally connection between arbitrary window 132,134 of crankcase 114 and level ports 130, thereby, when having connection between piston opening 146 and the arbitrary window 132,134, allow to clean fuel here from passing through.Piston 140 preferably manufactures the core of three pieces type, with weight reduction.

The description that Figure 56 and Figure 57 are detailed transmission channel lid 160.Transmission channel lid 160 has defined a plurality of openings 161, is used to receive the fastening piece that transmission channel lid 160 is fastened to the corresponding lid on the body 112; And the safety of guaranteeing transmission channel lid 160.Transmission channel lid 160 main passage 164 of definition and circulation canals 162; Be used to be provided at the connection between one-level transmit port 126 and the Secondary Transmit port 130, circulation canal 166 provides at first window 132 of Secondary Transmit port 130 and the access path between second window 134.

Lid 160 is the manufacturings of a simple double-disk mould.In a preferred embodiment, motor 110 has defined a transmission channel, and its each reverse side is in the face of the running shaft of bent axle 154.

The operating process of two stroke IC engine 110 is described now.Shown in Figure 58, wherein show motor 110 and be in top dead center central position (TDCP).In this, when air-fuel mixture was advanced to crankcase 114, gas was compressed to the top of piston 140 in this process.Air also enters into second window 134 through air passageways 122, gets into first window 132 of Secondary Transmit port 130 then, enters into one-level transmit port 126 then.

Shown in Figure 59, wherein piston 160ATDC closes suction port 148 when 70 degree ATDC (after the top dead center center).In this, pressure begins to set up in crankcase 114.Even existing connection the between piston opening 146 and Secondary Transmit port 130; The interior dynamic gas of crankcase that enters into motor 110 does not increase crankcase 114 interior pressure and arrives this point, through transmission channel 124 any substantial backflow does not take place yet.In a preferred embodiment, passage 142 still is connected with air passageways 122, will close but when piston 140 moves down, connect, and in accompanying drawing 60, has been illustrated more clearly in this point.

When piston 140 descended in cylinder bore diameter 120 and be in 100 degree ATDC, at this moment, piston dome 151 began to open exhaust port.First window 132 of level ports 130; Be connected with crankcase 114 through piston opening 146; But; Between air passageways 122 and piston channel 142, there is not any connection,, is trapped in the air stagnation in the transmission channel 124 owing to exist the pressure that equates relatively between crankcase 114 and the cylinder chamber 116.

Shown in Figure 61, piston 140 is positioned in 124 degree ATDC.At this moment, the position of piston 140 is positioned in opens transmission channel 124, especially the top of first window 132 of transmission channel window 127 and level ports 130.On this aspect in the cycle period process of motor, one-level transmit port 126 is 1/4th of its open heights, yet level ports 130 is positioned in 136 on the bridge of the front of piston opening 146 and closes.This will produce enough delays, so that before comprehensive cleaning crankcase 114 takes place and before the air-fuel mixture introducing, utilize fills with air cylinder chamber 116 in one-level transmit port 126 and the Secondary Transmit port 130.

Shown in Figure 62; Wherein show the movement process of piston 140 towards dead center position, bottom (BDCP); At this moment; One-level transmit port 126 is opened with Secondary Transmit port 130 comprehensively, allow with crankcase 114 between comprehensive the connection, thereby force any remaining air-fuel mixture to flow in the cylinder chamber 116.

Shown in accompanying drawing 63, piston 140 is in the BDCP position.One-level transmit port 126 is opened with Secondary Transmit port 130 comprehensively, and waste gas is from being evacuated from cylinder chamber 116 through exhaust port 150.Be full of air-fuel mixture in the cylinder chamber.Shown zoomed-in view in the accompanying drawing 64, wherein clearer first window 132 and second window 134 that shows level ports 130, and the top transmission window 127 of transmit port 126.

When piston 140 continues vertical operation with towards the top dead center central position, the cleaning phase preferably accomplishes in the position of about 124 degree BTDC, and it has the Cycle Length of general 112 degree.

Shown in Figure 65, " G " defines between the bottom of the transmission window 125 of counter weight 157 and one-level transmit port 126 among the figure.Its intermediate gap " G " representative is than spacing bigger in the existing technology so that allow enough fluids to flow through one-level transmit port 126, and and the pressure of unconspicuous sacrifice crankcase.

Shown in Figure 66, wherein show relief opening 150 and be closed.Preferably, the release is between 90 degree and 120 degree.After exhaust port 150 has been closed, in crankcase, begin to set up compression cycle, continue to set up negative pressure simultaneously.On the point shown in Figure 66, piston 150 will temporarily allow air from air flow passage 122, to get into.

Shown in Figure 67, wherein show the position that piston 140 is in 70 degree BTDC.Air inlet port 148 begins to open, and air-fuel mixture is urged into through Carburetor, and simultaneously, air is to enter into one-level transmit port 126 through level ports passage 130.In this, as the sectional drawing shown in the accompanying drawing 68, level ports 130 is not opened piston channel 142, but connection can temporarily begin.Subsequently, piston 150 arrives TDCP, and circulation restarts.

One of improved characteristic is among the design, in the running of motor 110, the air head is provided in the level ports 130.This is effectively to delay to enter in the cylinder chamber 116 through the air/fuel mixture that level ports 130 is discharged from crankcase 114.

In order to improve the aeronautical dynamics of cleaning air flow constantly; Passage can be by 247 replacements of window around the piston backplate; It utilizes the window of first port to connect the upper window that secondary cleans port, and this window will be provided at the connection of flowing between the firsts and seconds port.

When using revised piston air passageways to replace the side cover passage, piston backplate ambient air passage utilizes the window of one-level port to connect the upper window or the part of blocking port (secondary).Meanwhile, lower passage 242 is set up being connected of flowing in air port with the lower window of blocking port or partly.This will create the air flow of a whole volume through blocking port.

Interchangeable; Replace using transmission circulation 162; Piston can be equipped with extra air passageways with the connection of flowing between the window of the upper window that is based upon level ports and one-level port, and the connection between these two groups of ports is only just opened when the air passageways on the piston backplate cooperates with the corresponding window at top dead centre position edge.

As the interchangeable scheme of the upper window on the side plate, can utilize the piston of a modification in order to realize same purpose, this can be described in detail through accompanying drawing 69-71.Piston 250 comprises piston dome 251, piston machine wrist pivot pin opening and upper channel connecting part 247, and foot passage 242, and upper channel 246, they are all similar with the parts in the aforementioned embodiment who mentions.Passage 247 matches with level ports upper window 132 and one-level port window, therefore, when piston is in the edge of TDC, sets up the connection of flowing.Simultaneously, air port 134 on bottom windows 242 and the cylinder wall and the bottom windows on the level ports 134 match.

Show a kind of hand-held tool like accompanying drawing 73, for example shown chain saw, it can use with motor 10 or 110 combinations.

Above-described two stroke engine, it has port and opening and the cleaning cylinder that is configured in the piston.The port and the opening of cleaning piston and cylinder arrangement.Though described the embodiment of the utility model above, those skilled in the art can carry out conspicuous multiple modification and distortion according to content above-mentioned in spirit that does not break away from the utility model and scope.Therefore, the embodiment of the model utility that the front is described embodies and the optimal mode of putting into practice model utility only is used to provide the purpose of the utility model, but does not limit this purpose.

Claims (19)

1. two-stroke internal combustion engine comprises:

An engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

A reciprocating adaptively bent axle, it is connected to piston through connecting rod, and bent axle provides counter weight above that;

An air passageways, it is connected with what flow with cylinder is interior;

A cleaning transmission channel; It connects between crankcase and cylinder chamber; It has an one-level transmit port that is connected with Secondary Transmit port, and Secondary Transmit port has the second dead end mouth of first and apart, wherein crosses over the space through bridge;

A piston; Slidably be positioned in the cylinder bore diameter, it has one or the passage in the piston periphery formed more, is used for optionally crankcase being connected with the air supply passage; It has a piston opening, is used for optionally crankcase being connected with transmission channel;

Its air flows through air passageways, through piston channel, gets into second window of Secondary Transmit port then then; Pass through first window of Secondary Transmit port then, and get into the one-level transmit port, there; Because piston moves towards the top dead central position, air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber; Because piston slides towards the bottom dead central position; When bridge stops being connected between piston opening and the Secondary Transmit port, in a part of process of the cylinder cycle period of piston before sliding in the bottom dead central position, at crankcase; There is whole connections between second window of piston opening and secondary transport passage; Therefore, following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

2. two-stroke internal combustion engine according to claim 1, the outside that is positioned at body of transmission channel wherein, and have a lid on it and be used to provide the transmission channel of keeping a sealing.

3. two-stroke internal combustion engine according to claim 1, air passageways wherein comprise two air clearances, and further, wherein, piston comprises two passages, each passage constitute itself and corresponding air clearance alignment relative.

4. two-stroke internal combustion engine according to claim 1; Wherein piston comprises two passages; Wherein first passage is used to provide the selectivity alignment of the air passageways in the engine wall, and second passage is used to provide first window of level ports and the alignment between the one-level port.

5. two-stroke internal combustion engine according to claim 1, wherein, between one-level transmit port and the Secondary Transmit port through being connected with opening between the level ports passage in the uppermost part of one-level port catheter.

6. two-stroke internal combustion engine according to claim 1, wherein the interval between first window and second window generally is the area that equates.

7. two-stroke internal combustion engine according to claim 1, wherein one of piston window of being opened on first and second apart generally has equal area.

8. two-stroke internal combustion engine according to claim 7; Wherein, Transmission channel is connected with crankcase through a lower transmission channel window, and further, wherein; The slit of enough sizes that can allow the transmission channel window that enough fluids flow through lower is provided between lower transmission channel window and counter weight, has kept the crankcase volume minimum dimension simultaneously.

9. two-stroke internal combustion engine comprises

An engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

A reciprocating adaptively bent axle, it is connected to piston through connecting rod, and bent axle provides bent axle breeding above that;

An air passageways, itself and mobile being connected of cylinder bore diameter;

A cleaning transmission channel, it connects between crankcase and cylinder chamber, and it has an one-level transmit port that is connected with Secondary Transmit port;

A piston; Slidably be positioned in the cylinder bore diameter, it has one or more passage that is formed on the piston periphery, is used for optionally level ports being connected with first port; It has a piston opening, is used for optionally crankcase being connected with transmission channel;

Its air flows through air passageways, through piston channel, gets into Secondary Transmit port then then; The piston opening is passed through in the back again, and gets into the one-level transmit port, there; Because piston moves towards the top dead central position, air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber; Because piston slides towards the bottom dead central position; At crankcase, there is whole connections between piston opening and the secondary transport passage, therefore; Following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

10. two-stroke internal combustion engine according to claim 9, the outside that is positioned at cylinder bore of transmission channel wherein, and have a lid on it and be used to provide the transmission channel of keeping a sealing.

11. two-stroke internal combustion engine according to claim 9, air passageways wherein comprise two air clearances, further, wherein, piston comprises two passages, each passage constitute itself and corresponding air clearance alignment relative.

12. two-stroke internal combustion engine according to claim 9, air passageways wherein comprise two air clearances, further, wherein, piston comprises two cover passages, and a cover passage is aimed at corresponding air clearance relatively; The second cover passage is aimed at level ports and one-level port relatively.

13. two-stroke internal combustion engine according to claim 9, wherein, in general, one of window of the piston opening and first or second space interval has equal widths.

14. two-stroke internal combustion engine according to claim 9; Wherein, Transmission channel is connected with crankcase through a lower transmission channel window; And further, wherein, the slit of enough sizes that can allow the transmission channel window that enough fluids flow through lower is provided between lower transmission channel window and counter weight.

15. two-stroke internal combustion engine comprises:

A) engine block, it defines a crankcase that is used for the sealed fuel mixture, and a cylinder chamber that is formed on cylinder bore diameter one end;

B) air passageways, itself and mobile being connected of cylinder bore diameter;

C) cleaning transmission channel, it connects between crankcase and cylinder chamber, and it has an one-level transmit port that is connected with Secondary Transmit port;

D) piston slidably is positioned in the cylinder bore diameter, and it has a passage that is formed on the piston periphery, and it has a piston opening, is used for optionally crankcase being connected with transmission channel;

E) its air flows through air passageways, through piston channel, gets into Secondary Transmit port then then; Get into the one-level transmit port then, there, because piston moves towards the top dead central position; Air still relatively lags behind, and the air that comes out from the one-level transmit port is being followed the fuel mixture that crankcase flows out then and flow in the cylinder chamber, because piston slides towards the bottom dead central position; At crankcase, there is whole connections between piston opening and the secondary transport passage, therefore; Following the fuel mixture that comes out from crankcase, any air of leaving in the secondary transport passage all is discharged in the cylinder chamber.

16. two-stroke internal combustion engine according to claim 15, wherein, an air inlet port is connected with crankcase, so that the fuel mixture in it passes through, further, wherein air passageways is positioned between the top of air intake ports and body.

17. two-stroke internal combustion engine according to claim 15, transmission channel wherein is positioned at the outside of body, and has a lid on it and be used to provide the transmission channel of keeping a sealing.

18. two-stroke internal combustion engine according to claim 15, wherein Secondary Transmit port has one first second window with space interval, and wherein the one bridge has been crossed over interval wherein, and wherein

Said bridge stops being connected between piston opening and the Secondary Transmit port; In a part of process of the cylinder cycle period of piston before sliding in the bottom dead central position; At crankcase, there is whole connections between second window of piston opening and secondary transport passage.

19. two-stroke internal combustion engine according to claim 18, wherein, one of window of the piston opening and first or second space interval has equal widths.

Images