CN214118344U - Two-stroke engine cylinder cover and engine - Google Patents

Abstract

The utility model relates to an engine technical field particularly, relates to a two-stroke engine cylinder lid and engine. The cylinder cover of the two-stroke engine comprises a cover body, an oil injector, a spark plug, an intake valve and an exhaust valve; the cover body is provided with a through air inlet channel and a through air outlet channel respectively, the air inlet channel forms an air inlet on the combustion surface of the cover body, and the air outlet channel forms an air outlet on the combustion surface; the inlet valve is movably arranged on the cover body to close or open the air inlet, and the exhaust valve is movably arranged on the cover body to close or open the exhaust port; the spark plug is arranged on the cover body, and the ignition end of the spark plug is positioned on the combustion surface; the oil sprayer is arranged on the inlet valve, and an oil nozzle of the oil sprayer faces the closed cavity. The air exchange quality is good, and the combustion efficiency is higher.

Description

Two-stroke engine cylinder cover and engine

Technical Field

The utility model relates to an engine technical field particularly, relates to a two-stroke engine cylinder lid and engine.

Background

The two-stroke engine is a simple and efficient piston engine, and has important application in daily life and production. The device has the characteristics of small volume, simple structure, convenient operation and high thrust-weight ratio.

However, the intake and exhaust processes of the existing two-stroke engine are almost simultaneously performed, the new gas is used for sweeping the exhaust gas, some new mixed gas inevitably flows out of the exhaust port, the exhaust gas is not easy to be cleared, and the two-stroke engine has the defects of poor air exchange quality and low fuel efficiency.

SUMMERY OF THE UTILITY MODEL

The object of the utility model includes, for example, provide a two-stroke engine cylinder lid and engine, its quality of taking a breath is good, and combustion efficiency is higher.

The embodiment of the utility model discloses a can realize like this:

in a first aspect, the utility model provides a two-stroke engine cylinder cap can constitute the airtight cavity in order to be used for the piston motion with the cylinder body, include:

the device comprises a cover body, an oil sprayer, a spark plug, an inlet valve and an exhaust valve;

the cover body is provided with a through air inlet channel and a through air outlet channel respectively, the air inlet channel forms an air inlet on the combustion surface of the cover body, and the air outlet channel forms an air outlet on the combustion surface;

the inlet valve is movably arranged on the cover body to close or open the air inlet, and the exhaust valve is movably arranged on the cover body to close or open the exhaust port;

the spark plug is arranged on the cover body, and the ignition end of the spark plug is positioned on the combustion surface;

the oil sprayer is arranged on the inlet valve, and an oil nozzle of the oil sprayer faces the closed cavity.

The two-stroke engine cylinder cap of this scheme has intake duct and the exhaust passage that sets up respectively, and respectively through the switching of the air inlet of intake valve control intake duct, through the switching of the gas vent of exhaust valve control exhaust passage, so realized controlling respectively of air inlet and gas vent to realized admitting air, carminative controlling respectively, and then realized that fresh air can get into the combustion chamber of engine smoothly, waste gas can follow the combustion chamber and discharge, ensured the quality of taking a breath and the higher combustion efficiency of engine. Furthermore, the fuel injector is arranged on the intake valve, namely the fuel injector and the intake valve form a functional component for air intake and fuel injection. The arrangement mode can reduce the occupied space of the oil injector and the intake valve and improve the space utilization rate of the cylinder cover; meanwhile, the arrangement mode can ensure the air intake and oil injection effects and improve the combustion efficiency of the engine. In conclusion, the two-stroke engine cylinder cover enables the engine to have better air exchange quality and more efficient combustion efficiency, and has fewer pollutants, and environmental protection benefit and economic benefit are more outstanding.

In an alternative embodiment, the intake air of the intake passage is high-pressure air.

In an alternative embodiment, the injector is located on the same axis as the intake valve in the height direction of the intake valve.

In an alternative embodiment, the injector is disposed concentrically with the intake valve in a circumferential direction of the intake valve.

In an alternative embodiment, the injector is movably connected to the intake valve in the height direction of the intake valve.

In an alternative embodiment, the intake valve is provided with a through connection hole in the height direction of the intake valve;

the fuel injector is movably arranged in the connecting hole in a penetrating mode.

In an alternative embodiment, when the fuel injector moves relative to the connecting hole, the fuel injection port of the fuel injector is fixed relative to the combustion surface of the cover body.

In an alternative embodiment, the intake valve is further provided with an annular receiving portion;

the bearing part is arranged at the position of the connecting hole close to the head part of the inlet valve, and the outer wall of the bearing part is hermetically connected with the inner wall of the connecting hole;

the inner ring of the bearing part forms a matching hole matched with the nozzle of the fuel injector, and the periphery of the nozzle is abutted against the bearing part.

In an alternative embodiment, the intake valve further comprises a flared extension;

along the height direction of the intake valve, the extension opening extends from one end, away from the head part of the intake valve, of the matching hole to the end surface of the head part of the intake valve, and the opening of the extension opening is gradually increased.

In an alternative embodiment, the end of the extension port remote from the head of the inlet valve is a predetermined distance from the end of the receptacle remote from the head of the inlet valve.

In an alternative embodiment, the two-stroke engine cylinder head comprises one intake valve and a plurality of exhaust valves; and the exhaust valves are uniformly distributed on the periphery of the intake valve in the circumferential direction.

In an alternative embodiment, the two-stroke engine cylinder head comprises a plurality of spark plugs, and the spark plugs are uniformly distributed on the periphery of the intake valve in the circumferential direction; and the distance between the spark plug and the intake valve is smaller than the distance between the exhaust valve and the intake valve.

In an alternative embodiment, the number of spark plugs is the same as the number of exhaust valves.

In an alternative embodiment, said spark plug is arranged between adjacent said exhaust valves.

In an alternative embodiment, the air inlet channel is arranged vertically on the cover.

In an alternative embodiment, one end of the exhaust passage penetrates through the combustion surface of the cover body, and the other end of the exhaust passage penetrates through the side surface of the cover body.

In a second aspect, the present invention provides an engine, comprising:

a piston, a crank mechanism, a cylinder block, and a two-stroke engine head according to any of the preceding embodiments;

the two-stroke engine cylinder cover and the cylinder body form a closed cavity for the movement of the piston;

the crankshaft mechanism is arranged in the cylinder body and is in transmission connection with the piston.

Because the engine comprises the two-stroke engine cylinder cover, fresh air can be sucked more efficiently and waste gas can be discharged more fully during air exchange, so that better air exchange quality is obtained, higher combustion efficiency is guaranteed during fuel combustion in the engine, and the technical problems of more pollutants and high oil consumption caused by low combustion efficiency can be avoided.

The utility model discloses beneficial effect includes, for example:

an intake valve of the cylinder head of the two-stroke engine is movably arranged on the cover body to close or open the intake port, and an exhaust valve is movably arranged on the cover body to close or open the exhaust port. So realized controlling respectively to air inlet and gas vent to realized controlling respectively of air inlet process, exhaust process. Compare in current two-stroke engine advance, the exhaust process goes on almost simultaneously, and make and to have some new gas mixture outflow gas vents when utilizing new gas to sweep away waste gas, waste gas is also difficult for cleaing away totally to cause the quality of taking a breath poor, the technical problem that combustion efficiency is low, the two-stroke engine cylinder cap of this scheme can guarantee that fresh air gets into the combustion chamber of engine smoothly, waste gas is discharged rapidly in the combustion chamber, has ensured the quality of taking a breath and the higher combustion efficiency of engine.

On the other hand, the oil injector of the cylinder cover of the two-stroke engine is arranged on the inlet valve, and the oil injection port of the oil injector faces the closed cavity. The arrangement mode can reduce the occupied space of the oil injector and the intake valve and improve the space utilization rate of the cylinder cover; simultaneously, such mode of setting up can ensure the effect of admitting air and oil spout, and the mixed gas that improves in the combustion chamber has better homogeneity, mixing efficiency to improve the combustion efficiency of engine. In addition, the air inlet of the cylinder cover of the two-stroke engine is relatively far away from the crankshaft side relative to the piston, so that engine oil is prevented from entering the combustion chamber, and the problems of high oil consumption and serious pollution caused by the fact that the engine oil enters the combustion chamber due to the fact that the air inlet is close to the crankshaft side in the prior art are solved.

In conclusion, the two-stroke engine cylinder cover enables the engine to have better air exchange quality and more efficient combustion efficiency, and has superior environmental protection benefits and economic benefits.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a cylinder head of a two-stroke engine according to an embodiment of the present invention in an axial direction;

fig. 2 is a schematic structural view of another view angle of the cylinder head of the two-stroke engine according to the embodiment of the present invention;

fig. 3 is a schematic structural view of a further view angle of a cylinder head of a two-stroke engine according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3;

FIG. 5 is a schematic structural diagram of an intake valve and an oil injector according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of an intake valve and fuel injector according to an embodiment of the present invention;

FIG. 7 is an assembly schematic diagram of an intake valve and fuel injector according to an embodiment of the present invention;

fig. 8 is a cross-sectional view from another perspective of a two-stroke engine cylinder head according to an embodiment of the present invention.

Icon: 10-two-stroke engine cylinder head; 100-a cover body; 101-top end face; 102-a combustion surface; 110-an air inlet channel; 111-an air inlet; 120-an exhaust passage; 122-an exhaust port; 200-oil injector; 210-an oil jet; 300-a spark plug; 410-an intake valve; 411-attachment holes; 420-an exhaust valve; 510-a bolster; 511-mating holes; 610-extension port.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The existing reciprocating engine mainly comprises two main types of four-stroke and two-stroke:

the existing four-stroke engine is characterized in that:

1. the engine rotates for two weeks to do work once, and the power loss of the engine is serious;

2. single cylinder applications are difficult;

3. compared with a single-cylinder two-stroke engine, the engine has the advantages of large volume, complex structure and high cost.

The existing two-stroke engine is characterized in that:

1. the air intake and exhaust processes are almost simultaneously carried out, the new air is used for sweeping the waste gas, some new mixed air inevitably flows out of the exhaust port, and the waste gas is not easy to be cleaned;

2. the air inlet is closer to the crankshaft side relative to the piston, so that engine oil can easily enter a combustion chamber, and the oil consumption is high and the pollution is serious.

Furthermore, when the two-stroke engine runs at a low speed, the opening of an accelerator is small, exhaust is insufficient, scavenging is incomplete, and the concentration of fresh mixed gas in a combustion chamber is low, so that the fresh mixed gas is incompletely combusted, and the content of CH compounds in waste gas is increased sharply; meanwhile, when scavenging, a part of fresh mixed gas is discharged together with the waste gas, and the lubricating oil in the mixed gas is not sufficiently combusted, so that CH compounds in the exhaust gas are increased. This results in serious contamination during its operation.

In addition, the existing reciprocating engine air intake mode mainly comprises natural air suction and supercharging air intake. Whereas supercharged intake air has mainly two types, mechanical supercharging and turbocharging.

In the areas with thin air, the engine can have altitude reaction, and the power is obviously reduced; the turbocharging function is "burdensome" at low engine speeds and is more intense than the "altitude response" of a naturally aspirated engine.

Therefore, there is a need for a two-stroke engine that combines the advantages of the existing two-stroke and four-stroke engines, and is suitable for use in areas with lean air.

In order to improve the technical problem, the following embodiments provide a two-stroke engine cylinder head and an engine.

Fig. 1 and 2 are schematic structural views of a two-stroke engine head 10 according to the present embodiment, fig. 3 is a schematic structural view of another perspective view of the two-stroke engine head 10 in fig. 2, and fig. 4 is a sectional view taken along a direction a-a in fig. 3.

Referring to fig. 1 to 4, it can be seen that the present embodiment provides a two-stroke engine cylinder head 10, which can be combined with a cylinder body to form a closed cavity for piston movement, and comprises a cover body 100, an injector 200, a spark plug 300, an intake valve 410 and an exhaust valve 420.

The cover body 100 has a combustion surface 102 close to the cylinder block and forming a part of a combustion chamber, and a tip end surface 101 away from the cylinder block and opposite to the combustion surface 102.

The cover body 100 is respectively provided with a penetrating air inlet passage 110 and a penetrating air outlet passage 120, the air inlet passage 110 forms an air inlet 111 on the combustion surface 102 of the cover body 100, and the air outlet passage 120 forms an air outlet 122 on the combustion surface 102;

the intake valve 410 is movably provided on the cover body 100 to close or open the intake port 111, and the exhaust valve 420 is movably provided on the cover body 100 to close or open the exhaust port 122;

the spark plug 300 is arranged on the cover body 100, and the ignition end of the spark plug 300 is positioned on the combustion surface 102;

the injector 200 is arranged on the inlet valve 410, and an injection port of the injector 200 faces the closed cavity.

The intake valve 410 of the two-stroke engine cylinder head 10 of the present embodiment is movably disposed on the cover body 100 to close or open the intake port 111, and the exhaust valve 420 is movably disposed on the cover body 100 to close or open the exhaust port 122. This realizes separate control of the intake port 111 and the exhaust port 122, thereby realizing separate intake and exhaust processes. Compare in current two-stroke engine advance, the exhaust process goes on almost simultaneously, and make and to have some new gas mixture outflow gas vent 122 when utilizing new gas to sweep away waste gas, waste gas is also difficult for cleaing away totally, thereby it is poor to cause the quality of taking a breath, the technical problem that combustion efficiency is low, the two-stroke engine cylinder lid 10 of this scheme can make and admit air, the exhaust is gone on respectively, guarantee that fresh air gets into the combustion chamber of engine smoothly, waste gas gets rid of totally in following the combustion chamber rapidly, the quality of taking a breath and the higher combustion efficiency of engine have been ensured.

On the other hand, the injector 200 of the two-stroke engine cylinder head 10 is arranged on the intake valve 410, and the injection port of the injector 200 faces the sealed cavity. That is, injector 200 and intake valve 410 of the present embodiment constitute functional components for intake and injection. The arrangement mode can reduce the occupied space of the oil injector 200 and the intake valve 410, and improve the space utilization rate of the cylinder cover; meanwhile, the arrangement mode can ensure the effects of air intake and oil injection, so that mixed gas in the combustion chamber has better uniformity and mixing efficiency, and the combustion efficiency of the engine is improved.

In addition, the air inlet 111 of the cylinder head 10 of the two-stroke engine is relatively far away from the crankshaft side relative to the piston, so that engine oil is prevented from entering a combustion chamber, and the problems of high oil consumption and serious pollution caused by the fact that the engine oil enters the combustion chamber due to the fact that the air inlet 111 is close to the crankshaft side in the prior art are solved.

Further, such a two-stroke engine cylinder head 10 is suitable for a two-stroke engine, and compared with a four-stroke engine, the two-stroke engine cylinder head can achieve the technical effects of small self power loss, single-cylinder application, small size, simple structure and low cost.

It should be noted that the intake air of the intake passage 110 of the two-stroke engine head 10 in the present embodiment is high-pressure air.

I.e. the two-stroke engine cylinder head 10 can be adapted for high-pressure gas as intake fluid for the inlet channel 110. Compared with the existing engine, the arrangement mode can enable more air to be contained in the cylinder under the condition of the same volume in the cylinder, and therefore better ventilation quality and combustion efficiency are achieved. The altitude reaction phenomenon that the power of the engine in the prior art is obviously reduced in the area with thin air is improved, so that the engine is ensured to have more use scenes and wider application range.

Fig. 5 is a schematic structural diagram of fuel injector 200 and intake valve 410 constituting functional components for intake and injection of fuel according to the present embodiment. Fig. 6 is a sectional view of the functional assembly. Fig. 7 is an assembly view of the functional assembly.

With continued reference to fig. 1-7, further structural details of the two-stroke engine cylinder head 10 will be provided.

As can be seen from the figure, in the present embodiment of the present invention, the injector 200 is located on the same axis as the intake valve 410 in the height direction of the intake valve 410. Alternatively, the fuel injector 200 is disposed concentrically with the intake valve 410 in the circumferential direction of the intake valve 410.

Thus, good alignment degree of the inlet valve 410 and the fuel injector 200 is guaranteed, and the mixed gas obtained by the operation of the fuel injector 200 and the inlet valve 410 can be guaranteed to be more uniform; while facilitating structural stability and reliability of the functional components for intake and injection composed of injector 200 and intake valve 410.

Further, as shown in fig. 4, 5, 6 and 7, in the present embodiment, the injector 200 is movably connected to the intake valve 410 in the height direction of the intake valve 410.

Optionally, in the present embodiment of the present invention, the intake valve 410 is provided with a through connection hole 411 along the height direction of the intake valve 410; the fuel injector 200 is movably inserted into the connection hole 411.

Specifically, the intake valve 410 includes a cylindrical stem portion, and a trumpet-top head portion. The head portion thereof has a closed surface close to the inlet duct 110, and a combustion end surface remote from the inlet duct 110 (close to the combustion chamber).

As can be seen from the figure, the air inlet channel 110 in the present embodiment is a cylindrical through hole extending vertically. The inlet valve 410 has a stem portion that is clearance-fitted to the inlet duct 110, and the stem portion and the inner wall of the inlet duct 110 form a passage into which air (high-pressure compressed gas) enters.

The connection hole 411 penetrates the intake valve 410 in the height direction of the intake valve 410. The connection hole 411 is a cylindrical through hole. The fuel injector 200 and the connection hole 411 are bored in the connection hole 411. By the arrangement mode, the oil injector 200 is integrated on the structure of the intake valve 410, so that the occupied space of the oil injector 200 is reduced, and the space utilization rate of the cylinder cover 10 of the two-stroke engine is improved; meanwhile, the fuel injector 200 and the intake valve 410 are integrated together, so that the uniformity and the efficiency of mixing fuel and air can be improved, and the combustion efficiency is guaranteed.

It is understood that in other embodiments of the present invention, the injector 200 and the intake valve 410 may be not arranged in the center, but have a certain angle, as long as the injector 200 and the intake valve 410 are stably connected.

Further, in other embodiments of the present invention, the fuel injector 200 and the intake valve 410 may not be movably connected in the height direction of the intake valve 410. For example, in the radial direction of intake valve 410, fuel injector 200 is connected to intake valve 410 by snap-fit, pin-joint, or the like. As long as both of them can achieve both injection and intake.

Further, in other embodiments of the present invention, the fuel injector 200 and the intake valve 410 may even be fixedly connected. For example, injector 200 is fixedly coupled to intake valve 410 with the injection port facing the combustion chamber. This is merely an example and is not intended to be limiting.

In the present embodiment of the invention, when the injector 200 and the connection hole 411 move relatively, the injection port of the injector 200 and the combustion surface 102 of the cover 100 are fixed relatively.

That is, the position of injector 200 is always fixed with respect to cover body 100, and only intake valve 410 moves with respect to cover body 100. When the head of the intake valve 410 is far away from the cover body 100 and the head keeps a clearance with the intake port 111, the intake port 111 is opened, and the engine is charged; when the head of the intake valve 410 approaches the cover body 100 and the head closes the intake port 111, the intake passage 110 is closed.

Further, in the present embodiment of the present invention, the intake valve 410 is further provided with an annular receiving portion 510; the socket 510 is arranged at the position of the connecting hole 411 close to the head of the intake valve 410, and the outer wall of the socket 510 is hermetically connected with the inner wall of the connecting hole 411;

the inner ring of the socket 510 forms a fitting hole 511 that fits the nozzle of the fuel injector 200, and the periphery of the nozzle abuts against the socket 510.

The bolster 510 functions to support the fuel injector 200 and to define the position of the fuel injector 200.

Optionally, in this embodiment, the intake valve 410 further includes a flared extension 610; in the height direction of the intake valve 410, the extension port 610 extends from one end of the fitting hole 511 remote from the head portion of the intake valve 410 to the end surface of the head portion of the intake valve 410, and the opening of the extension port 610 gradually increases.

It should be noted here that when the intake valve 410 opens the intake port 111 and the intake passage 110 keeps intake, the edge of the oil jet of the nozzle is flush with the smallest end surface of the extension port 610. When the fuel is injected from the injection port of the injection nozzle 210, the fuel can rapidly enter the combustion chamber along the extension 610 to sufficiently mix the mixture in the combustion chamber.

In the present embodiment of the invention, the end of the extension port 610 away from the head of the intake valve 410 has a predetermined distance from the end of the receiving portion 510 away from the head of the intake valve 410. Therefore, the fuel is prevented from entering the connecting hole 411 above the bearing part 510 through the matching hole 511, the reverse osmosis of the fuel is guaranteed, and the quality of the mixed gas is guaranteed.

As can also be seen from fig. 1 to 7, in the present embodiment of the invention, the two-stroke engine cylinder head 10 comprises one intake valve 410 and a plurality of exhaust valves 420; a plurality of exhaust valves 420 are circumferentially evenly distributed around the periphery of the intake valve 410.

Alternatively, the present embodiment includes one intake valve 410 and three exhaust valves 420, with the three exhaust valves 420 being disposed circumferentially evenly around the intake valve 410. And both the intake valve 410 and the exhaust valve 420 are movably provided on the cover body 100 in the vertical direction of the cover body 100.

In addition, the head of the intake valve 410 and the head of the exhaust valve 420 in the present embodiment are the same in diameter.

As can also be seen from the figure, the two-stroke engine cylinder head 10 comprises a plurality of spark plugs 300, and the spark plugs 300 are uniformly distributed on the periphery of the intake valve 410 in the circumferential direction; and the spacing between spark plug 300 and intake valve 410 is less than the spacing between exhaust valve 420 and intake valve 410.

The ignition plug 300 is provided in the cover body 100 obliquely in the direction from the tip end face 101 to the combustion face 102 of the cover body 100. Specifically, the distance between the top of the spark plug 300 and the inlet channel 110 is greater than the distance between the bottom of the piston and the inlet. This ensures the stability and reliability of ignition of the spark plug 300.

In the present embodiment of the present invention, the number of the spark plugs 300 is the same as the number of the exhaust valves 420, and is three. Alternatively, each spark plug 300 is disposed between adjacent exhaust valves 420.

As can be seen, in the present embodiment, one end of the exhaust passage 120 penetrates the combustion surface 102 of the cover 100, and the other end of the exhaust passage 120 penetrates the side surface of the cover 100.

It should be noted that in this embodiment, the opening or closing of the intake valve 410 and the exhaust valve 420 may be performed by a conventional valve train including a camshaft, a rocker arm, and a tappet, or may be performed by full electrical control. And are not limited herein.

In a second aspect, the present invention provides an engine comprising a piston, a crankshaft mechanism, a cylinder block and a two-stroke engine cylinder head 10 according to any one of the preceding embodiments; the two-stroke engine cylinder cover 10 and the cylinder body form a closed cavity for the movement of the piston; the crankshaft mechanism is arranged in the cylinder body and is in transmission connection with the piston.

Because the engine comprises the two-stroke engine cylinder cover 10, fresh air can be sucked more efficiently and waste gas can be discharged more fully during air exchange, so that better air exchange quality is obtained, higher combustion efficiency is guaranteed during fuel combustion in the engine, and the technical problems of more pollutants and high oil consumption caused by low combustion efficiency can be avoided.

It will be appreciated that such an engine is a two-stroke engine, please refer to fig. 1 to 8. The working principle is as follows:

in the first stroke, the intake valve 410 of the two-stroke engine cylinder head 10 is opened. High-pressure gas enters the combustion chamber through the inlet valve 410, and the oil nozzle 210 starts to inject oil; when the air inflow reaches the requirement, the air inflow is finished; the fuel injector 210 can continue to inject fuel, and the spark plug 300 starts to ignite (multiple times of fuel injection and ignition can be performed in the process); then the mixed gas in the combustion chamber is combusted and a large amount of heat energy is released; the volume of the combustion gas is expanded, and the pressure and the temperature are increased; the gas pressure pushes the piston to move from the top dead center to the bottom dead center (i.e. the piston moves to a position far away from the upper end of the combustion chamber), and the crankshaft is pushed to rotate to do work through the connecting rod. As shown in fig. 4, wherein the line segments and solid arrows show the direction of intake air.

In the second stroke, the mixture in the combustion chamber is combusted to work and then becomes exhaust gas, the exhaust valve 420 of the cylinder head 10 of the two-stroke engine is opened, and the exhaust gas is exhausted from the exhaust passage 120. The piston approaches the upper end of the combustion chamber from the position far away from the upper end of the combustion chamber. As shown in fig. 8, where the line segments and solid arrows show the direction of the exhaust.

The crankshaft of the engine rotates for one circle and can complete one working cycle after two strokes.

To sum up, the embodiment of the utility model provides a two-stroke engine cylinder lid 10 and engine have following advantage at least:

1. the upper jacking type intake and exhaust two-stroke engine with a valve structure;

2. high-pressure gas is directly fed into the combustion chamber, so that the engine can avoid 'altitude reaction' fundamentally;

3. the ventilation quality is better, and the combustion efficiency is higher.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A two-stroke engine cylinder head, can constitute with the cylinder block in order to be used for the airtight cavity of piston motion, its characterized in that includes:

a cover body (100), an oil injector (200), a spark plug (300), an inlet valve (410) and an exhaust valve (420);

a penetrating air inlet channel (110) and a penetrating air outlet channel (120) are respectively arranged on the cover body (100), the air inlet channel (110) forms an air inlet (111) on a combustion surface (102) of the cover body (100), and the air outlet channel (120) forms an air outlet (122) on the combustion surface (102);

the inlet valve (410) is movably arranged on the cover body (100) to close or open the air inlet (111), and the outlet valve (420) is movably arranged on the cover body (100) to close or open the air outlet (122);

the spark plug (300) is arranged on the cover body (100), and the ignition end of the spark plug (300) is positioned on the combustion surface (102);

the oil injector (200) is arranged on the inlet valve (410), and an oil injection port of the oil injector (200) faces the closed cavity.

2. A two-stroke engine cylinder head as claimed in claim 1, characterized in that:

the fuel injector (200) is movably connected with the air inlet valve (410) along the height direction of the air inlet valve (410).

3. A two-stroke engine cylinder head as claimed in claim 2, characterized in that:

the air inlet valve (410) is provided with a through connecting hole (411) along the height direction of the air inlet valve (410);

the oil injector (200) is movably arranged in the connecting hole (411) in a penetrating mode.

4. A two-stroke engine head according to claim 3, characterized in that:

when the fuel injector (200) and the connecting hole (411) move relatively, a fuel injection port of the fuel injector (200) and a combustion surface (102) of the cover body (100) are relatively fixed.

5. A two-stroke engine cylinder head according to claim 4, characterized in that:

the intake valve (410) is also provided with an annular receiving part (510);

the bearing part (510) is arranged at the position of the connecting hole (411) close to the head part of the intake valve (410), and the outer wall of the bearing part (510) is hermetically connected with the inner wall of the connecting hole (411);

the inner ring of the bearing part (510) forms a matching hole (511) matched with the nozzle of the fuel injector (200), and the periphery of the nozzle is abutted against the bearing part (510).

6. A two-stroke engine cylinder head as claimed in claim 1, characterized in that:

said two-stroke engine cylinder head comprising an intake valve (410) and exhaust valves (420); the exhaust valves (420) are evenly distributed on the periphery of the intake valve (410) in the circumferential direction.

7. A two-stroke engine cylinder head according to claim 6, characterized in that:

the cylinder head of the two-stroke engine comprises a plurality of spark plugs (300), and the spark plugs (300) are uniformly distributed at the periphery of the intake valve (410) in the circumferential direction; and the distance between the spark plug (300) and the intake valve (410) is smaller than the distance between the exhaust valve (420) and the intake valve (410).

8. A two-stroke engine cylinder head as claimed in claim 7, characterized in that:

the spark plug (300) is disposed between adjacent exhaust valves (420).

9. An engine, comprising:

a piston, a crankshaft mechanism, a cylinder block and a two-stroke engine cylinder head according to any one of claims 1 to 8;

the two-stroke engine cylinder cover and the cylinder body form a closed cavity for the movement of the piston;

the crankshaft mechanism is arranged in the cylinder body and is in transmission connection with the piston.

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