CN213392388U - Novel two-stroke engine - Google Patents

Abstract

The application discloses novel two-stroke engine, which comprises a housing, the bent axle, piston and connecting rod, the connecting rod includes relative movement's first member and second member, the casing includes crankcase and cylinder, be provided with the air inlet on the lateral wall of cylinder, gas vent and limit structure, when piston and limit structure act on, the contained angle has between connecting rod and the vertical line, distance between the upper end of first member and the bent axle main shaft and the crank axle's length sum is less than or equal to the maximum length of connecting rod, air inlet and gas vent are located the top of piston, air inlet and gas vent department all are equipped with closing mechanism. So set up, at the unchangeable in-process in piston position, through opening and closing of independent control air inlet and gas vent, make the exhaust process and the process of breathing in go on alone, each other does not influence, can avoid the combustible mixture gas that newly gets into the cylinder directly to discharge from the gas vent, has avoided the fuel loss, has reduced emission pollution.

Description

Novel two-stroke engine

Technical Field

The utility model relates to the technical field of engines, especially, relate to a novel two-stroke engine.

Background

The two-stroke engine completes one working cycle in two strokes, and the crankshaft rotates one circle to do work once. The cylinder block of a two-stroke engine is provided with three ports, an inlet port, an exhaust port and a transfer port, which are closed by pistons at certain times. When the piston moves upwards from the lower dead point, the air inlet hole, the exhaust hole and the scavenging hole are closed simultaneously, the mixed gas entering the cylinder is compressed, the air inlet hole can be gradually exposed below the piston along with the upward movement of the piston, and when the air inlet hole is exposed, the combustible mixed gas can enter the crankcase. When the piston moves to the vicinity of the top dead center, the spark plug ignites the combustible mixed gas, the combustible mixed gas expands to push the piston to move downwards to do work, the air inlet is closed, and the combustible mixed gas sealed in the crankcase is compressed; when the piston moves to be close to the bottom dead center, the exhaust hole is gradually exposed above the piston, and when the exhaust hole is exposed, the exhaust gas is flushed out of the cylinder; then the air vent is exposed above the piston, the combustible mixture pre-pressed in the crankcase is flushed into the cylinder to expel waste gas, and the air exchange process is carried out. In the process of air exchange, part of combustible mixed gas newly entering the cylinder can be directly discharged through the exhaust hole, so that fuel loss is caused, the fuel consumption rate of the two-stroke engine is increased, and meanwhile, emission pollution is caused.

Therefore, how to solve the problems of fuel loss and emission pollution caused by the exhaust hole and the scavenging hole being simultaneously opened during scavenging of the two-stroke engine in the prior art becomes an important technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the related art at least to a certain extent, the present application provides a novel two-stroke engine, which can solve the problems of fuel loss and emission pollution caused by the fact that an exhaust hole and a scavenging hole are simultaneously in an open state when the two-stroke engine in the prior art is scavenging.

The utility model discloses a realize like this: a novel two-stroke engine comprises a machine shell, a crankshaft, a piston and a connecting rod, wherein the machine shell comprises a crankcase and a cylinder arranged above the crankcase, the piston is arranged in the cylinder in a vertically movable mode, and the crankshaft is arranged in the crankcase in a fixed-axis rotating mode; the connecting rod comprises a first rod piece and a second rod piece which are distributed up and down, the first rod piece and the second rod piece are coaxially arranged, a sliding rail structure is arranged between the first rod piece and the second rod piece, so that the first rod piece can move relative to the second rod piece along the length direction of the second rod piece, the upper end of the first rod piece is rotatably connected with the lower end of the piston, the lower end of the second rod piece is rotatably connected with a connecting rod journal of the crankshaft, and the rotating axis is parallel to the rotating axis of the crankshaft; be provided with air inlet, gas vent on the lateral wall of cylinder and be used for the restriction piston downstream's limit structure, the piston move to with when limit structure acts on, the contained angle has between connecting rod and the vertical line, the upper end of first member with the distance between the bent axle main shaft with bent axle crank's length sum is less than or equal to the maximum length of connecting rod, the air inlet with the gas vent is located the top of piston, the air inlet with gas vent department all is provided with closing mechanism.

Preferably, the limiting structure is a limiting ring arranged on the inner side wall of the cylinder, and the inner diameter of the limiting ring is smaller than the diameter of the piston.

Preferably, an air inlet channel communicated with the air inlet and an air outlet channel communicated with the air outlet extend out of the cylinder, and a pressurization system is arranged in each of the air inlet channel and the air outlet channel.

Preferably, the opening and closing mechanism includes a fixed block disposed outside the cylinder, a valve reciprocally movable in a radial direction of the cylinder with respect to the fixed block, and a drive transmission assembly for driving the valve to move, and the moving position of the valve includes a first position at which the exhaust port or the intake port is in an open state and a second position at which the exhaust port or the intake port is in a closed state.

Preferably, the axis of the valve is arranged along the horizontal direction, the driving transmission assembly comprises a cam capable of rotating in a fixed shaft mode and a transmission assembly arranged between the cam and the crankshaft, the rotating axis of the cam is perpendicular to the axis of the valve, and a reset assembly is arranged between the valve and the fixed block.

Preferably, both ends of the crankshaft extend to the outside of the crankcase and the rotation axis of the cam is parallel to the rotation axis of the crankshaft, and the transmission assembly is a chain transmission assembly or a belt transmission assembly.

Preferably, the transmission assembly is a belt transmission assembly, and comprises a first belt pulley rotating synchronously with the crankshaft, a second belt pulley rotating synchronously with the cam, and an endless belt tensioned on the first belt pulley and the second belt pulley.

Preferably, the reset assembly comprises a coil spring coaxially arranged with the valve, the coil spring is sleeved outside the valve, one end of the coil spring is fixedly connected with the fixed block, and the other end of the coil spring is fixedly connected with the valve.

Preferably, a pressing block is arranged between the valve and the cam, the pressing block is fixedly connected with the tail of the valve, and one side of the pressing block, which is close to the cam, is an arc surface.

Preferably, the pressurization system comprises a fan and a motor for driving the fan to rotate.

The technical scheme provided by the application comprises the following beneficial effects:

the application provides a novel two-stroke engine, including casing, bent axle, piston and connecting rod, wherein, the casing includes crankcase and cylinder, and the cylinder setting is in the top of crankcase, links together with the crankcase. The piston can move up and down in the cylinder, and the crankshaft can be fixed-shaft rotated in the crankcase. The connecting rod is arranged between the piston and the crankshaft and comprises a first rod piece and a second rod piece which are distributed up and down, the first rod piece and the second rod piece are coaxially arranged, and a sliding rail structure is arranged between the first rod piece and the second rod piece, so that the second rod piece can move relative to the first rod piece along the length direction of the first rod piece, and the total length of the connecting rod can be adjusted by enabling the first rod piece and the second rod piece to move relatively. The upper end of the first rod piece is rotationally connected with the lower end of the piston, the lower end of the second rod piece is rotationally connected with a connecting rod journal of the crankshaft, and the rotation axis is parallel to that of the crankshaft. The side wall of the cylinder is provided with an air inlet, an air outlet and a limiting structure, when the piston moves downwards to the position of the limiting structure, the limiting structure interacts with the piston to limit the piston to move downwards continuously, at the moment, an included angle is formed between the connecting rod and a vertical line, namely when the piston moves from an upper stop point to the limiting structure, the rotation angle of the crankshaft is less than 180 degrees; the sum of the distance between the upper end of the first rod piece and the crankshaft main shaft and the length of the crankshaft crank is less than or equal to the maximum length of the connecting rod, so that the crankshaft can rotate by 360 degrees; the air inlet and the air outlet are both positioned above the piston, the positions of the air inlet and the air outlet are both provided with an opening and closing mechanism, and the opening and the closing of the air inlet and the air outlet can be independently controlled through the opening and closing mechanism. In the process that the piston moves from the upper stop point to the limiting structure, the space at the upper part of the piston is increased and can correspond to the working process, at the moment, the air inlet and the air outlet are required to be in a closed state, in the process, the connecting rod is in a state with the shortest length, the piston has downward pressure on the connecting rod, and the connecting rod journal of the crankshaft is also subjected to downward pressure, so that the crankshaft is driven to rotate; when the piston moves to the position of the limiting structure, the position of the piston is unchanged under the action of the limiting structure, the air inlet and the air outlet are both positioned above the piston, the rotation of the crankshaft increases the distance between the connecting rod journal of the crankshaft and the piston, and the connecting rod can extend along with the rotation of the crankshaft to adapt to the increase of the distance until the crankshaft rotates to enable the axis of the connecting rod to be parallel to the vertical line; the crankshaft continues to rotate, the position of the piston is still unchanged, the distance between the connecting rod journal of the crankshaft and the piston is reduced, the connecting rod is shortened accordingly to adapt to the reduction of the distance until the crankshaft rotates to the position where the length of the connecting rod is shortest, and in the process, the air inlet is opened to perform an air suction process; the crankshaft continues to rotate, the connecting rod is in the state of the shortest length, the piston is driven to move to the top dead center from the limiting structure, in the process, the space at the upper part of the piston is reduced, the compression process can be corresponded, and at the moment, the air inlet and the air outlet are in the closing state. The piston reciprocates once to complete one work doing, air exhausting, air sucking and compressing process, i.e. one work cycle is completed in two strokes of the piston. So set up, stop at the piston at the in-process of limit structure position, through opening and closing of independent control air inlet and gas vent, make the exhaust process and the process of breathing in go on alone, each other does not influence, can avoid the combustible mixture who newly gets into the cylinder directly to discharge from the gas vent, has avoided fuel loss to two-stroke engine's fuel consumption rate has been reduced, has reduced emission pollution.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a novel two-stroke engine starting to do work according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a novel two-cycle engine starting to exhaust in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a new two-cycle engine intake configuration according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a new two-stroke engine starting compression according to an embodiment of the present invention.

Reference numerals:

1. a crankshaft; 2. a piston; 3. a connecting rod; 4. a crankcase; 5. a cylinder; 6. an air inlet; 7. an exhaust port; 8. a limiting structure; 9. an air intake passage; 10. an exhaust passage; 11. a pressurization system; 12. a fixed block; 13. an air valve; 14. a cam; 15. a coil spring; 16. and (7) briquetting.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The present embodiment aims to provide a novel two-stroke engine, which solves the problems of fuel loss and emission pollution caused by the fact that an exhaust hole and a scavenging hole are simultaneously in an open state when the two-stroke engine in the prior art is scavenging.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to FIGS. 1-4, schematic structural views of a novel two-stroke engine in some exemplary embodiments are shown. The novel two-stroke engine provided by the embodiment comprises a shell, a crankshaft 1, a piston 2 and a connecting rod 3, wherein the shell comprises a crankcase 4 and a cylinder 5, an ignition mechanism is arranged at the upper end of the cylinder 5, and the cylinder 5 is arranged above the crankcase 4 and connected with the crankcase 4. The piston 2 is movable up and down in the cylinder 5, and the crankshaft 1 is rotatable in the crankcase 4. The connecting rod 3 is arranged between the piston 2 and the crankshaft 1 and comprises a first rod piece and a second rod piece which are distributed up and down, the first rod piece and the second rod piece are coaxially arranged, a sliding rail structure is arranged between the first rod piece and the second rod piece, so that the second rod piece can move relative to the first rod piece along the length direction of the first rod piece, and the overall length of the connecting rod 3 can be adjusted by enabling the first rod piece and the second rod piece to move relatively. The upper end of the first rod piece is rotationally connected with the lower end of the piston 2, the lower end of the second rod piece is rotationally connected with a connecting rod journal of the crankshaft 1, and the rotation axis is parallel to that of the crankshaft 1. An air inlet 6, an air outlet 7 and a limiting structure 8 are arranged on the side wall of the air cylinder 5, when the piston 2 moves downwards to the position of the limiting structure 8, the limiting structure 8 interacts with the piston 2 to limit the piston 2 to continue moving downwards, at the moment, an included angle is formed between the connecting rod 3 and a vertical line, namely when the piston 2 moves from an upper stop point to the limiting structure 8, the rotation angle of the crankshaft 1 is smaller than 180 degrees; the sum of the distance between the upper end of the first rod piece and the main shaft of the crankshaft 1 and the length of the crank of the crankshaft 1 is less than or equal to the maximum length of the connecting rod 3, so that the crankshaft 1 can rotate by 360 degrees; the air inlet 6 and the air outlet 7 are both positioned above the piston 2; the air inlet 6 and the air outlet 7 are provided with opening and closing mechanisms, and the opening and the closing of the air inlet 6 and the air outlet 7 can be controlled independently through the opening and closing mechanisms.

In the process that the piston 2 moves from the upper dead point to the limiting structure 8, the space at the upper part of the piston 2 is increased and can correspond to the working process, at the moment, the air inlet 6 and the air outlet 7 are required to be in a closed state, in the process, the connecting rod 3 is in a state with the shortest length, the piston 2 has downward pressure on the connecting rod 3, and the connecting rod journal of the crankshaft 1 is also subjected to downward pressure so as to drive the crankshaft 1 to rotate, and refer to fig. 1-2; when the piston 2 moves to the position of the limiting structure 8, the position of the piston 2 is unchanged under the action of the limiting structure 8, the air inlet 6 and the air outlet 7 are both positioned above the piston 2, the rotation of the crankshaft 1 increases the distance between the connecting rod journal of the crankshaft 1 and the piston 2, and the connecting rod 3 can extend along with the rotation to adapt to the increase of the distance until the crankshaft 1 rotates to enable the axis of the connecting rod 3 to be parallel to the vertical line, in the process, the air outlet 7 can be opened first, the air outlet process is carried out, and after the air outlet is finished, the air outlet 7 is closed, referring to fig. 2-3; the crankshaft 1 continues to rotate, the position of the piston 2 is still unchanged, the distance between a connecting rod journal of the crankshaft 1 and the piston 2 is reduced, and the connecting rod 3 is shortened to adapt to the reduction of the distance until the crankshaft 1 rotates to the position where the length of the connecting rod 3 is shortest, in the process, the air inlet 6 is opened, and an air suction process is performed, and refer to fig. 3-4; the crankshaft 1 continues to rotate, the connecting rod 3 is in the state of the shortest length, and the piston 2 is driven to move to the top dead center from the limiting structure 8, in the process, the space at the upper part of the piston 2 is reduced, the compression process can be corresponded, and at the moment, the air inlet 6 and the air outlet 7 are both in the closing state. The piston 2 reciprocates once to complete one working, exhausting, inhaling and compressing process, i.e. one working cycle is completed in two strokes of the piston 2.

So set up, stop at piston 2 at the in-process of 8 positions of limit structure, through opening and closing of independent control air inlet 6 and gas vent 7, make the exhaust process and the process of breathing in go on alone, each other does not influence, can avoid newly getting into the combustible mixture of cylinder 5 and directly discharge from gas vent 7, has avoided the fuel loss to the fuel consumption rate of two-stroke engine has been reduced, has reduced emission pollution.

The sliding rail structure comprises a sliding groove arranged on the first rod piece, the extending direction of the sliding groove is consistent with the length direction of the first rod piece, and the upper end of the second rod piece can extend into the sliding groove and can reciprocate along the length direction of the sliding groove. The lower extreme of first member is provided with first stopper, the upper end of second member is provided with the second stopper, first stopper is located the lateral wall of spout, when the upper end of first member and the lower extreme of second member kept away from each other to the maximum distance, even the upper end of second member moves to the lower extreme of first member, the first stopper of first member lower extreme also can interact with the second stopper of second member upper end, make the removal of first stopper restriction second stopper, thereby prevent that the second member from deviating from in the spout.

In this embodiment, above-mentioned limit structure 8 is the spacing ring that sets up on the 5 inside walls of cylinder, and the spacing ring is located the lower extreme of 5 inside walls of cylinder, and the axis of spacing ring and the coincidence of the axis of cylinder 5, and the internal diameter of spacing ring is less than the diameter of piston 2, and when piston 2 removed to limit structure 8 position department, spacing ring upper surface and 2 lower surfaces of piston interact to restriction piston 2's removal.

In the implementation, an intake passage 9 communicated with the intake port 6 and an exhaust passage 10 communicated with the exhaust port 7 are extended outside the cylinder 5, and a pressurization system 11 is arranged in each of the intake passage 9 and the exhaust passage 10 to ensure the smooth proceeding of the intake process and the exhaust process.

The supercharging system 11 located in the intake passage 9 and the supercharging system 11 located in the exhaust passage 10 may be a mechanical supercharging system, a gas wave supercharging system, an electric turbocharging system or a compound supercharging system, and may be specifically selected according to the use scenario of the engine. The charging system 11 located in the intake channel 9 may also be an exhaust gas turbocharging system. The above-mentioned mechanical supercharging system, the gas wave supercharging system, the electric turbocharging system, the compound supercharging system or the exhaust gas turbocharging system are mature prior arts, and are not described herein again.

In implementation, the supercharging system 11 located in the intake passage 9 and the supercharging system located in the exhaust passage 10 may be both provided in the form of a fan, and specifically include a fan and a motor for driving the fan to rotate, and through the rotation of the fan, an air flow is formed, so that the intake efficiency and the exhaust efficiency of the air cylinder 5 are improved. Alternatively, the fan may be connected to the crankshaft 1 by a transmission mechanism, and the fan may be driven by the rotation of the crankshaft 1.

In this embodiment, the opening and closing mechanism provided in the intake port 6 and the opening and closing mechanism provided in the exhaust port 7 have the same structure, and each of the opening and closing mechanisms includes a fixed block 12, a valve 13, and a drive transmission assembly, the fixed block 12 is provided outside the cylinder 5 and is configured to support the valve 13, the valve 13 is capable of reciprocating relative to the fixed block 12 along the radial direction of the cylinder 5, the moving position of the valve 13 includes a first position at which the exhaust port 7 or the intake port 6 is in an open state and a second position at which the exhaust port 7 or the intake port 6 is in a closed state, when the head of the valve 13 moves to the position of the intake port 6 or the exhaust port 7, the intake port 6 or the exhaust port 7 is in a closed state, and when the head of the valve 13.

In implementation, the axis of the valve 13 may be arranged in a horizontal direction, and the driving transmission assembly is used for driving the valve 13 to move, and specifically includes a cam 14 capable of rotating in a fixed axis and a transmission assembly arranged between the cam 14 and the crankshaft 1, the rotation axis of the cam 14 is perpendicular to the axis of the valve 13, the tail of the valve 13 contacts with the arc surface of the cam 14, the contact position of the tail of the valve 13 and the cam 14 is different, and the distance between the tail of the valve 13 and the rotation axis of the cam 14 is different, so that the rotation of the cam 14 pushes the valve 13 to move. In order to ensure that the valve 13 is always contacted with the cambered surface of the cam 14, a resetting component is arranged between the valve 13 and the fixed block 12.

It should be noted that, the crankshaft 1 is rotationally connected to the crankcase 4, two ends of the crankshaft 1 extend to the outside of the crankcase 4, and one end of the crankshaft 1 is provided with a flywheel, a starter, and the like, which are prior art and are not described in detail in this application.

In the present embodiment, the rotational axis of the cam 14 is parallel to the rotational axis of the crankshaft 1, and in this case, the transmission assembly may be provided as a belt transmission assembly. At this time, the transmission assembly includes a first pulley rotating synchronously with the crankshaft 1, a second pulley rotating synchronously with the cam 14, and an endless belt tensioned on the first pulley and the second pulley, and specifically, the first pulley may be coaxially and fixedly disposed with the crankshaft 1, and the second pulley may be coaxially and fixedly disposed with the cam 14. In order to ensure the transmission precision, the first belt wheel and the second belt wheel can adopt synchronous belt wheels, and correspondingly, the annular belt can adopt a synchronous belt.

As an alternative embodiment, the transmission assembly may also be a chain transmission assembly, in which case the transmission assembly includes a first sprocket rotating synchronously with the crankshaft 1, a second sprocket rotating synchronously with the cam 14, and a chain wound around the first sprocket and the second sprocket, and specifically, the first sprocket may be fixed coaxially with the crankshaft 1, and the second sprocket may be fixed coaxially with the cam 14.

The operating state of the valve 13 is correlated with the operating state of the piston 2, and in the embodiment, the transmission ratio of the transmission assembly is 1. The shape of the cam 14 needs to be designed according to the corresponding rotation angle of the crankshaft 1 in the working process, the exhaust process, the air suction process and the compression process respectively, so as to ensure that the air inlet 6 and the air outlet 7 can be opened or closed at corresponding time, and ensure that the novel two-stroke engine can work normally.

In implementation, the reset assembly includes a coil spring 15, and the coil spring 15 is disposed coaxially with the valve 13 and sleeved outside the valve 13. The coil spring 15 may be an extension spring, one end of which is fixedly connected to the fixed block 12, and the other end of which is fixedly connected to the valve 13.

In implementation, a pressing block 16 is arranged between the valve 13 and the cam 14, the pressing block 16 is fixedly connected with the tail of the valve 13, one side of the pressing block 16, which is close to the cam 14, is an arc surface, the circle center corresponding to the arc surface is located on the rotation axis of the cam 14, and the arrangement of the arc surface on the pressing block 16 is beneficial to accurately controlling the opening time of the valve 13 and is beneficial to ensuring the stable opening degree of the air inlet 6 and the air outlet 7. The length of the cambered surface on the pressing block 16 is related to the opening time of the air inlet 6 and the air outlet 7, and is set according to the requirement.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A novel two-stroke engine is characterized by comprising a machine shell, a crankshaft (1), a piston (2) and a connecting rod (3), wherein the machine shell comprises a crankcase (4) and a cylinder (5) arranged above the crankcase (4), the piston (2) can be arranged in the cylinder (5) in a vertically moving mode, and the crankshaft (1) can be arranged in the crankcase (4) in a fixed-axis rotating mode;

the connecting rod (3) comprises a first rod piece and a second rod piece which are distributed up and down, the first rod piece and the second rod piece are coaxially arranged, a sliding rail structure is arranged between the first rod piece and the second rod piece, so that the first rod piece can move relative to the second rod piece along the length direction of the second rod piece, the upper end of the first rod piece is rotatably connected with the lower end of the piston (2), the lower end of the second rod piece is rotatably connected with a connecting rod journal of the crankshaft (1), and the rotating axis is parallel to the rotating axis of the crankshaft (1);

be provided with air inlet (6), gas vent (7) and be used for the restriction on the lateral wall of cylinder (5) piston (2) downstream's limit structure (8), piston (2) move to with when limit structure (8) are used, the contained angle has between connecting rod (3) and the vertical line, the upper end of first member with distance between bent axle (1) the main shaft with bent axle (1) articulate length sum is less than or equal to the maximum length of connecting rod (3), air inlet (6) with gas vent (7) are located the top of piston (2), air inlet (6) with gas vent (7) department all is provided with closing mechanism.

2. A new two-stroke engine according to claim 1, characterized in that the stop structure (8) is a stop ring arranged on the inner side wall of the cylinder (5), the inner diameter of the stop ring being smaller than the diameter of the piston (2).

3. A new type of two-stroke engine according to claim 1, characterized in that the cylinder (5) is externally extended with an intake channel (9) communicating with the intake port (6) and an exhaust channel (10) communicating with the exhaust port (7), and a supercharging system (11) is arranged in both the intake channel (9) and the exhaust channel (10).

4. A new type of two-stroke engine according to claim 1, characterized in that the opening and closing mechanism comprises a fixed block (12) arranged outside the cylinder (5), a valve (13) reciprocally movable in the radial direction of the cylinder (5) with respect to the fixed block (12) and a drive transmission assembly for driving the valve (13) to move, the moving position of the valve (13) comprising a first position in which the exhaust port (7) or the intake port (6) is in an open state and a second position in which the exhaust port (7) or the intake port (6) is in a closed state.

5. A novel two-stroke engine according to claim 4, characterized in that the axis of the valve (13) is arranged in the horizontal direction, the driving transmission assembly comprises a cam (14) capable of rotating in a fixed shaft mode and a transmission assembly arranged between the cam (14) and the crankshaft (1), the rotating axis of the cam (14) is perpendicular to the axis of the valve (13), and a reset assembly is arranged between the valve (13) and the fixed block (12).

6. A new two-stroke engine according to claim 5, characterized in that the two ends of the crankshaft (1) extend outside the crankcase (4) and the axis of rotation of the cam (14) is parallel to the axis of rotation of the crankshaft (1), the transmission assembly being a chain transmission assembly or a belt transmission assembly.

7. A new type of two-stroke engine according to claim 6, characterized in that the transmission assembly is a belt transmission assembly comprising a first pulley rotating synchronously with the crankshaft (1), a second pulley rotating synchronously with the cam (14) and an endless belt tensioned over the first and second pulleys.

8. The novel two-stroke engine according to claim 5, wherein the reset assembly comprises a coil spring (15) coaxially arranged with the valve (13), the coil spring (15) is sleeved outside the valve (13), one end of the coil spring (15) is fixedly connected with the fixed block (12), and the other end of the coil spring is fixedly connected with the valve (13).

9. The novel two-stroke engine according to claim 8, characterized in that a pressing block (16) is arranged between the valve (13) and the cam (14), the pressing block (16) is fixedly connected with the tail part of the valve (13), and one side of the pressing block (16) close to the cam (14) is an arc surface.

10. A new two-stroke engine according to claim 3, characterized in that the supercharging system (11) comprises a fan and an electric motor for driving the fan in rotation.

Images