Valve mechanism of two-stroke piston type internal combustion engine
By setting an exhaust port at the top of the cylinder and controlling the exhaust port using an exhaust valve mechanism and a valve pushrod mechanism, the contradiction between the exhaust port position and piston length in a two-stroke piston internal combustion engine is resolved, achieving a more flexible design and improved thermal efficiency.
Patent Information
- Application Number
- CN202423276684.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing two-stroke piston internal combustion engines, there are contradictions between the exhaust port position, piston length, connecting rod length, and crank diameter, which leads to increased energy loss, low thermal efficiency, and limited design scope.
An exhaust port is set at the top of the cylinder, and the opening and closing of the exhaust port is controlled by the exhaust valve mechanism and the valve pushrod mechanism. The valve pushrod mechanism is driven by a cam, eliminating the control of the exhaust port on the cylinder wall and extending the power stroke.
The piston length is not restricted by the exhaust port and the air intake port, and the relationship between work, exhaust and scavenging is more relaxed, which reduces the weight of the piston and connecting rod, reduces energy loss and improves thermal efficiency.
Smart Images
Figure CN223459430U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of piston internal combustion engines, in particular to a valve mechanism of a two-stroke piston internal combustion engine. BACKGROUND
[0002] In the prior art, a two-stroke piston internal combustion engine mainly comprises a crankcase, a cylinder block, a cylinder head, a piston assembly, a connecting rod, a crankshaft assembly, an ignition device, an oil supply device and the like. The exhaust port and the scavenging port of the two-stroke piston internal combustion engine are both arranged on the cylinder wall, and their opening and closing are controlled by the up-and-down running distance of the piston. When the exhaust port is opened, it is considered that the end of the working stroke.
[0003] If the opening of the exhaust port is delayed to prolong the working time, a longer piston height is needed to ensure that the piston keeps the exhaust port closed at the top dead center, which will cause the increase of the length of the connecting rod and the weight of the piston. The heavier connecting rod and piston will also cause the increase of the moment of inertia, resulting in energy loss. Therefore, if the thermal efficiency of the two-stroke piston internal combustion engine is to be improved, there is a certain contradictory relationship among the above-mentioned exhaust port position, piston length, connecting rod length and crank diameter, and the designable range is limited.
[0004] In view of the above problems, a valve mechanism of a two-stroke piston internal combustion engine is provided. CONTENT OF THE INVENTION
[0005] The present disclosure aims to overcome the shortcomings of the prior art, provide a valve mechanism of a two-stroke piston internal combustion engine, and realize the extension of the piston running distance of the working stroke. The piston length is not limited by the exhaust port and the intake port, and the relationship among the working, exhaust and scavenging is more relaxed in designability.
[0006] To achieve the above-mentioned purposes of the invention, the present disclosure adopts the following technical solutions:
[0007] A valve mechanism of a two-stroke piston internal combustion engine, comprising a cylinder, a piston movably arranged in the cylinder, a crankshaft rotatably arranged in the cylinder, a connecting rod connecting the piston and the crankshaft, an intake port arranged on one side wall of the cylinder, and an exhaust port arranged at the top end of the cylinder.
[0008] An exhaust valve mechanism for opening or closing the exhaust port is arranged in the exhaust port. A valve tappet mechanism connected with the exhaust valve mechanism is arranged on the cylinder. A cam is arranged at one end of the crankshaft, which is used to drive the valve tappet mechanism to move, so as to open or close the exhaust valve mechanism.
[0009] In an exemplary embodiment of the present disclosure, the cylinder comprises a cylinder block, a cylinder head detachably arranged at the top end of the cylinder block, and a crankcase detachably arranged at the bottom end of the cylinder block.
[0010] The crankshaft is arranged to rotate in the crankcase, and the exhaust port is arranged on the cylinder head.
[0011] In an exemplary embodiment of the present disclosure, the exhaust port comprises a chamber and a pipe which are communicated in sequence, and the chamber is communicated with the cylinder body and the pipe is communicated with the outside.
[0012] In an exemplary embodiment of the present disclosure, the exhaust valve mechanism comprises:
[0013] A guide rod is movably arranged in the chamber, one end of the guide rod is provided with an exhaust valve for opening or closing the exhaust port, and the other end of the guide rod extends out of the cylinder head.
[0014] A spring is sleeved on the guide rod, one end of the spring is connected with the exhaust valve, and the other end of the spring is connected with the inner wall of the chamber.
[0015] A rocker arm is rotatably arranged at the top end of the cylinder head, one end of the rocker arm is in sliding contact with the other end of the guide rod.
[0016] When the rocker arm swings, the guide rod can be moved in the chamber to open or close the exhaust port.
[0017] In an exemplary embodiment of the present disclosure, the top end of the cylinder head is provided with a mounting bracket, and the middle of the rocker arm is rotatably connected with the mounting bracket.
[0018] In an exemplary embodiment of the present disclosure, the exhaust valve top rod mechanism comprises:
[0019] A top rod is movably arranged at one side of the cylinder, one end of the top rod is hingedly connected with the other end of the rocker arm.
[0020] A connecting rod is arranged at the other end of the top rod, a free end of the connecting rod extends into the crankcase and is in sliding contact with the cam, and the connecting rod can reciprocate in the crankcase.
[0021] When the cam rotates, the top rod and the connecting rod can be moved longitudinally to make the rocker arm swing.
[0022] In an exemplary embodiment of the present disclosure, the crankcase is detachably provided with an end cover at one end close to the cam, and the end cover is provided with a guide pipe communicated with the crankcase at the top end.
[0023] The connecting rod passes through the guide pipe and is in sliding contact with the cam.
[0024] In an exemplary embodiment of the present disclosure, the end cover is detachably arranged at one end of the cam near the crankcase, and a guide pipe is arranged at the top end of the end cover and communicates with the crankcase.
[0025] The connecting rod is in sliding contact with the cam through the guide pipe.
[0026] In an exemplary embodiment of the present disclosure, a plurality of intake ports are arranged on the inner wall of the lower part of the cylinder, and two intake windows are symmetrically arranged on the lower part of the piston and correspond to the intake ports.
[0027] In an exemplary embodiment of the present disclosure, at least one spark plug is arranged at the top end of the cylinder.
[0028] The present disclosure has the following beneficial effects:
[0029] (1) The present disclosure sets an exhaust port on the cylinder head, sets an exhaust valve mechanism on the cylinder head for opening and closing the exhaust port, sets a cam on the crankshaft for controlling the time or angle of opening and closing of the exhaust valve mechanism, sets a valve tappet mechanism on the cylinder for transmitting the lifting action of the cam to the exhaust valve mechanism, and pushes the valve tappet mechanism and the exhaust valve mechanism by the cam on the crankshaft when the crankshaft rotates, thereby realizing the opening and closing of the exhaust port.
[0030] (2) The present disclosure sets an exhaust port on the cylinder head, cancels the cylinder wall exhaust port of the traditional two-stroke internal combustion engine, makes the opening time of the exhaust port not controlled by the piston stroke, makes the piston length not limited by the exhaust port and the intake port, prolongs the running distance of the piston in the working stroke, and realizes the more relaxed designability of the relationship among the working, exhaust, and scavenging.
[0031] (3) The present disclosure reduces the weight of the piston, reduces the weight of the connecting rod, and reduces the length of the connecting rod, thereby reducing the energy loss of the internal combustion engine and improving the thermal efficiency of the two-stroke piston internal combustion engine. BRIEF DESCRIPTION OF DRAWINGS
[0032] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments in accordance with the present disclosure, and together with the description, serve to explain the principles of the present disclosure. It is clear that the drawings described below are only some embodiments of the present disclosure, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.
[0033] Figure 1 In an embodiment of the present disclosure, the overall schematic diagram of the valve mechanism of the two-stroke piston internal combustion engine is shown.
[0034] Figure 2 In an embodiment of the present disclosure, the rear view of the valve mechanism of the two-stroke piston internal combustion engine is shown.
[0035] Figure 3 FIG. 1 is a sectional view of a valve mechanism of a two-stroke piston engine according to an embodiment of the present disclosure;
[0036] Figure 4 FIG. 2 is a sectional view of a valve mechanism of a two-stroke piston engine according to an embodiment of the present disclosure;
[0037] Figure 5 FIG. 3 is a schematic diagram of an internal structure of a valve mechanism of a two-stroke piston engine according to an embodiment of the present disclosure.
[0038] Explanation of Reference Numerals:
[0039] 1: cylinder, 101: cylinder block, 102: cylinder head, 103: crankcase, 104: end cover, 2: piston, 3: crankshaft, 4: connecting rod, 5: intake port, 6: exhaust port, 601: air chamber, 602: air pipe, 7: cam, 8: guide rod, 9: valve, 10: spring, 11: rocker arm, 12: mounting bracket, 13: top rod, 14: connecting rod, 15: guide pipe, 16: heat sink, 17: through hole, 18: intake passage, 19: intake window, 20: spark plug. DETAILED DESCRIPTION
[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Additionally, the drawings are merely schematic and viewed from different angles as a result, the illustration of some components can be different from others.
[0041] Although relative terms such as "upper", "lower", etc. are used herein to describe one component's relationship to another component as the figure is oriented, such terminology is used for convenience only and is not intended to limit the scope of the disclosure. It is to be understood that other orientations are within the scope of the disclosure. As used herein, the term "on" or "directly on" means there is direct contact between elements. As used herein, the term "directly connected" means that there are no intermediary connecting elements between elements that are connected. As used herein, the term "indirectly connected" means that there are one or more intermediary connecting elements between elements that are connected. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0042] The terms "one", "a", "an", "the", and "at least one" are used to indicate that "one or more" of the identified element / s, member / s, etc. is / are present; the terms "includes" and "including" are used to indicate an open-ended inclusion of the named element / s, member / s, etc. and that additional element / s, member / s, etc. can be present; the terms "first", "second", and "third", etc. are used only as labels, and do not constitute numerical limitations of their objects.
[0043] The valve mechanism of the two-stroke piston internal combustion engine according to the present disclosure provides a valve mechanism of a two-stroke piston internal combustion engine, which comprises a cylinder 1, a piston 2 movably arranged in the cylinder 1, a crankshaft 3 rotatably arranged in the cylinder 1, a connecting rod 4 connected between the piston 2 and the crankshaft 3, an intake port 5 formed in a side wall of the cylinder 1, and an exhaust port 6 formed in a top end of the cylinder 1; an exhaust valve mechanism for opening or closing the exhaust port 6 is arranged in the exhaust port 6; a valve tappet mechanism connected with the exhaust valve mechanism is arranged on the cylinder 1; a cam 7 is arranged at one end of the crankshaft 3, and the cam 7 is used to drive the valve tappet mechanism to move, so as to open or close the exhaust valve mechanism. Figures 1 to 5
[0044] In the valve mechanism of the two-stroke piston internal combustion engine according to the present disclosure, the valve mechanism of the two-stroke piston internal combustion engine is composed of the cylinder 1, the piston 2, the crankshaft 3, and the connecting rod 4; the piston 2 is movably arranged in the cylinder 1; the crankshaft 3 is rotatably arranged in the cylinder 1 and located below the piston 2; the connecting rod 4 is located between the piston 2 and the crankshaft 3; one end of the connecting rod 4 is rotatably connected with the piston 2 through a bearing; the other end of the connecting rod 4 is rotatably connected with the crankshaft 3 through a bearing; the intake port 5 is formed in a side wall of the cylinder 1; the exhaust port 6 is formed in a top end of the cylinder 1; the exhaust valve mechanism for opening or closing the exhaust port 6 is arranged in the exhaust port 6; the cam 7 is arranged on the crankshaft 3; the valve tappet mechanism connected with the exhaust valve mechanism is arranged on one side of the cylinder 1; through the rotation of the crankshaft 3, the cam 7 is driven to rotate; the cam 7 pushes the valve tappet mechanism and the exhaust valve mechanism to move, so as to open or close the exhaust port 6.
[0045] Compared with the existing two-stroke piston internal combustion engine, the valve mechanism of the two-stroke piston internal combustion engine is provided with the exhaust port on the top end of the cylinder, and the exhaust port of the traditional two-stroke internal combustion engine is cancelled, so that the opening time of the exhaust port is not controlled by the piston stroke, the length of the piston is not limited by the exhaust port and the intake port, the running distance of the piston in the working stroke is prolonged, the relationship among the working, exhaust, and scavenging is more relaxed, the weight of the piston is reduced, the weight and length of the connecting rod are reduced, the energy loss of the internal combustion engine is reduced, and the thermal efficiency of the two-stroke piston internal combustion engine is improved.
[0046] In one embodiment of the present disclosure, the valve mechanism of the two-stroke piston internal combustion engine according to the present disclosure provides a valve mechanism of a two-stroke piston internal combustion engine, which comprises a cylinder 1, a piston 2 movably arranged in the cylinder 1, a crankshaft 3 rotatably arranged in the cylinder 1, a connecting rod 4 connected between the piston 2 and the crankshaft 3, an intake port 5 formed in a side wall of the cylinder 1, and an exhaust port 6 formed in a top end of the cylinder 1; an exhaust valve mechanism for opening or closing the exhaust port 6 is arranged in the exhaust port 6; a valve tappet mechanism connected with the exhaust valve mechanism is arranged on the cylinder 1; a cam 7 is arranged at one end of the crankshaft 3, and the cam 7 is used to drive the valve tappet mechanism to move, so as to open or close the exhaust valve mechanism. Figures 1 to 5 , the cylinder 1 comprises a cylinder body 101, a cylinder cover 102 is detachably arranged at the top end of the cylinder body 101, and a crankcase 103 is detachably arranged at the bottom end of the cylinder body 101. In this way, the cylinder 1 can be quickly disassembled and assembled, and the use of the two-stroke piston internal combustion engine is facilitated
[0047] Optionally, referring to Figures 1 to 5 , the crankshaft 3 is rotatably arranged in the crankcase 103, and the exhaust port 6 is arranged on the cylinder cover 102. In this way, the opening time of the exhaust port 6 is not controlled by the stroke of the piston 2, the running distance of the piston 2 in the working stroke is extended, and the thermal efficiency of the internal combustion engine is improved.
[0048] In an embodiment of the present disclosure, referring to Figure 4 , the exhaust port 6 comprises a gas chamber 601 and a gas pipe 602 which are sequentially communicated, the gas chamber 601 is communicated with the cylinder body 101, and the gas pipe 602 is communicated with the outside. In this way, the exhaust gas in the cylinder 1 can be conveniently discharged through the exhaust port 6, and the exhaust port 6 can be conveniently opened or closed through the exhaust valve mechanism.
[0049] In an embodiment of the present disclosure, referring to Figures 1 to 5 , the exhaust valve mechanism comprises a guide rod 8 movably arranged in the gas chamber 601, a valve 9 arranged at one end of the guide rod 8 for opening or closing the exhaust port 6, and the other end of the guide rod 8 extends out of the cylinder cover 102; a spring 10 sleeved on the guide rod 8, one end of the spring 10 is connected with the valve 9, and the other end of the spring 10 is connected with the inner wall of the gas chamber 601; a rocker arm 11 rotatably arranged at the top end of the cylinder cover 102, one end of the rocker arm 11 is in sliding contact with the other end of the guide rod 8; when the rocker arm 11 swings, the guide rod 8 can move in the gas chamber 601 to open or close the exhaust port 6.
[0050] The valve tappet mechanism comprises a tappet 13 movably arranged at one side of the cylinder 1, one end of the tappet 13 is hingedly connected with the other end of the rocker arm 11; a connecting rod 14 arranged at the other end of the tappet 13, the free end of the connecting rod 14 extends into the crankcase 103 and is in sliding contact with the cam 7, and the connecting rod 14 can reciprocate in the crankcase 103; when the cam 7 rotates, the tappet 13 and the connecting rod 14 can move longitudinally to make the rocker arm 11 swing. In this way, the time or angle at which the exhaust port 6 is opened or closed can be controlled.
[0051] It can be understood that through the rotation of the cam 7, the valve tappet mechanism is pushed to move longitudinally, the exhaust valve mechanism is driven to move, the valve tappet mechanism transmits the lifting action of the cam to the exhaust valve mechanism, and the exhaust port 6 is opened or closed; through the rotation of the cam 7, the time or angle at which the exhaust valve mechanism is opened and closed is controlled, the opening time of the exhaust port is not controlled by the stroke of the piston, the length of the piston is not limited by the exhaust port and the intake port, the running distance of the piston in the working stroke is extended, and the relationship among the working, exhaust and scavenging has more relaxed designability.
[0052] Optionally, referring to Figure 1 and Figure 2 , the top end of the cylinder head 102 is provided with a mounting frame 12, and the middle of the rocker arm 11 is rotationally connected with the mounting frame 12. In this way, the swinging of the rocker arm 11 can be facilitated, and the power of the jack rod 13 can be transmitted to the guide rod 8, so that the guide rod 8 moves in the air chamber 601, and the opening or closing of the exhaust port 6 is realized.
[0053] In an embodiment of the present disclosure, referring to Figures 1 to 3 , the crankcase 103 is detachably provided with an end cover 104 at one end close to the cam 7, and the end cover 104 is provided with a guide pipe 15 in communication with the crankcase 103; the connecting rod 14 is in sliding contact with the cam 7 through the guide pipe 15. In this way, the jack rod 13 and the connecting rod 14 can be guided and limited, and the connecting rod 14 can be prevented from being separated from the cam 7, so that the lifting action of the cam 7 can be transmitted to the exhaust valve mechanism.
[0054] In an embodiment of the present disclosure, referring to Figures 1 to 4 , a plurality of heat dissipation plates 16 are sleeved on the outer wall of the cylinder body 101, and a plurality of heat dissipation plates 16 are uniformly arranged on the top end of the cylinder head 102. In this way, the heat dissipation efficiency of the air cylinder 1 can be improved, and the use of the internal combustion engine can be facilitated.
[0055] Optionally, referring to Figure 1 , each of the plurality of heat dissipation plates 16 is provided with a through hole 17 coaxial with the same axis, the jack rod 13 is connected with the connecting rod 14 in sequence through the plurality of through holes 17, and the jack rod 13 can reciprocate in the plurality of through holes 17. In this way, the jack rod 13 can be guided to move vertically at all times, and the lifting action of the cam 7 can be further transmitted to the exhaust valve mechanism.
[0056] In an embodiment of the present disclosure, referring to Figure 3 , a plurality of intake ports 18 are arranged at intervals on the inner wall of the lower part of the cylinder body 101, and two air inlet windows 19 are symmetrically arranged on the lower part of the piston 2, and the air inlet windows 19 correspond to the intake ports 18. In this way, fresh gas can be delivered into the cylinder body 101.
[0057] Optionally, the number of intake ports 18 is four, and the four intake ports 18 are uniformly arranged on the inner wall of the cylinder body 101, and two air inlet windows 19 correspond to two intake ports 18, respectively.
[0058] Optionally, the four intake ports 18 are symmetrically arranged in pairs.
[0059] In an embodiment of the present disclosure, referring to Figures 1 to 4 , at least one spark plug 20 is arranged at the top end of the air cylinder 1.
[0060] In an example, the number of spark plugs 20 is two, and the two spark plugs 20 are symmetrically installed on the top end of the cylinder head 102.
[0061] In an embodiment of the present disclosure, the air inlet 5 is arranged on a side wall of the cylinder 1, and the air inlet 5 is communicated with the crankcase 103.
[0062] It can be understood that the air inlet 5 can be arranged on any one of the side wall of the cylinder body 101, the side wall of the crankcase 103, or the end cover 104.
[0063] In an embodiment of the present disclosure, referring to Figures 1 to 5 Figures 1 to 5 The working process of the valve mechanism of the two-stroke piston internal combustion engine is briefly described as follows:
[0064] In use of the present disclosure, when the piston 2 moves upward in the cylinder body 101, the valve 9 always closes the exhaust port 6, and the fresh mixture gas enters the cylinder body 101 through the air inlet 5 and the air inlet channel 18. When the piston 2 moves above the air inlet channel 18, the piston 2 closes the air inlet channel 18, and the gas pressure in the cylinder body 101 gradually increases. When the piston 2 moves to the top dead center, the spark plug 20 ignites, the mixture gas burns and expands, and pushes the piston 2 to move downward. When the piston 2 moves downward in the cylinder body 101, the gas pressure in the cylinder body 101 gradually decreases, the piston 2 drives the crankshaft 3 to rotate through the connecting rod 4, the crankshaft 3 drives the cam 7 to rotate, the connecting rod 14 moves on the cam 7 from the proximal end to the distal end of the cam 7, the connecting rod 14 and the top rod 13 move upward along the guide pipe 15 and the through hole 17, drive the rocker arm 11 to rotate counterclockwise around the mounting frame 12, the rocker arm 11 drives the guide rod 8 to move downward in the air chamber 601, the spring 10 is stretched, the valve 9 is opened, the exhaust gas in the cylinder body 101 is discharged through the exhaust port 6, and the piston 2 continues to move downward. The connecting rod 14 moves on the cam 7 from the distal end to the proximal end of the cam 7, so that the guide rod 8 and the valve 9 move upward. When the piston 2 moves to the bottom dead center, the valve 9 closes the exhaust port 6, and the next cycle is ready to start.
[0065] In an embodiment of the present disclosure, when the piston 2 moves upward in the cylinder body 101, the valve 9 always closes the exhaust port 6, and when the piston 2 moves above the air inlet channel 18, the piston 2 closes the air inlet channel 18. When the piston 2 moves downward in the cylinder body 101, the valve 9 opens the exhaust port 6 before the piston 2 moves to the air inlet channel 18, and when the piston 2 moves to the bottom dead center, the valve 9 closes the exhaust port 6.
[0066] In another embodiment of the present disclosure, the cam 7 is rotatably installed on the cylinder head 102, and the cam 7 is connected with the crankshaft 3 through a chain or a belt transmission. The rotation of the crankshaft 3 is transmitted through the chain or the belt to drive the cam 7 to rotate, drive the exhaust valve mechanism to move, and realize the opening or closing of the exhaust port 6.
[0067] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims
1. A valve mechanism of a two-stroke piston internal combustion engine, comprising a cylinder (1) in which a piston (2) is movably arranged, and a crankshaft (3) is rotatably arranged in the cylinder (1), and the crankshaft (3) is connected to the piston (2) by means of a connecting rod (4), characterized in that, The air cylinder (1) one side wall is provided with an air inlet (5), the air cylinder (1) top end is provided with exhaust port (6); The exhaust port (6) is provided with an exhaust valve mechanism for opening or closing the exhaust port (6), the air cylinder (1) is provided with valve top rod mechanism connected with the exhaust valve mechanism, the crankshaft (3) one end is provided with cam (7), the cam (7) is used to drive the valve top rod mechanism movement, to open or close the exhaust valve mechanism.
2. The valve train of a two-stroke piston engine according to claim 1, characterised in that The air cylinder (1) includes cylinder body (101), the cylinder body (101) top end is detachably provided with cylinder cover (102), the cylinder body (101) bottom end is detachably provided with crankcase (103); The crankshaft (3) rotation is arranged in the crankcase (103), the exhaust port (6) is provided on the cylinder cover (102).
3. The valve train of a two-stroke piston engine according to claim 2, characterised in that The exhaust port (6) includes air chamber (601) and air pipe (602) communicated in sequence, and the air chamber (601) is communicated with the cylinder body (101), the air pipe (602) is communicated with the outside.
4. The valve train of a two-stroke piston engine according to claim 3, characterised in that The exhaust valve mechanism includes: Guide rod (8), movably arranged in the air chamber (601), one end of the guide rod (8) is provided with a valve (9) for opening or closing the exhaust port (6), the other end of the guide rod (8) extends out of the cylinder cover (102); Spring (10), sleeve is arranged on the guide rod (8), one end of the spring (10) is connected with the valve (9), the other end of the spring (10) is connected with the inner wall of the air chamber (601); Rocking arm (11), rotation is arranged on the top end of the cylinder cover (102), one end of the rocking arm (11) is in sliding contact with the other end of the guide rod (8); When the rocking arm (11) swings, the guide rod (8) can be moved in the air chamber (601) to open or close the exhaust port (6).
5. The valve train of a two-stroke piston engine according to claim 4, characterised in that The top end of the cylinder cover (102) is provided with a mounting bracket (12), and the middle of the rocking arm (11) is rotatably connected with the mounting bracket (12).
6. The valve train of a two-stroke piston engine according to claim 4, characterised in that The valve top rod mechanism includes: Top rod (13), movably arranged on one side of the air cylinder (1), one end of the top rod (13) is hinged with the other end of the rocking arm (11); Connecting rod (14), arranged on the other end of the top rod (13), the free end of the connecting rod (14) extends into the crankcase (103), and is in sliding contact with the cam (7), the connecting rod (14) can reciprocate in the crankcase (103); When the cam (7) rotates, the top rod (13) and the connecting rod (14) can move longitudinally, so that the rocking arm (11) swings.
7. The valve train of a two-stroke piston engine according to claim 6, characterized in that The crankcase (103) is detachably provided with an end cover (104) near one end of the cam (7), and the end cover (104) is provided with a conduit (15) communicated with the crankcase (103) at the top end; The connecting rod (14) passes through the conduit (15) and is in sliding contact with the cam (7).
8. The valve train of a two-stroke piston engine according to claim 7, characterised in that A plurality of heat dissipation plates (16) are sleeved on the outer wall of the cylinder (101), a plurality of through holes (17) with the same axis are formed in each of the heat dissipation plates (16), and the ejector rod (13) is connected with the connecting rod (14) by sequentially penetrating through the through holes (17), and the ejector rod (13) can reciprocate in the through holes (17).
9. The valve train of a two-stroke piston engine according to claim 2, characterised in that A plurality of air inlets (18) are arranged on the inner wall of the lower part of the cylinder (101) at intervals, and two air inlet windows (19) are symmetrically arranged on the lower part of the piston (2) and correspond to the air inlets (18).
10. The valve train of a two-stroke piston engine according to claim 1, characterized in that At least one spark plug (20) is arranged at the top end of the air cylinder (1).