Variable exhaust port device of two-stroke engine

Abstract

The invention discloses a variable exhaust port device of a two-stroke engine, and aims to overcome the defects that in the prior art, although an exhaust hole with a variable opening size is formed in the two-stroke engine, the exhaust efficiency of waste gas is still limited and needs to be further improved when the engine runs at a high speed. According to the technical scheme, a main exhaust hole and an auxiliary exhaust hole are formed in the inner side wall of an air cylinder body, a main exhaust valve for controlling the opening size of the main exhaust hole is arranged in the main exhaust hole, and an auxiliary exhaust valve for controlling the opening size of the main exhaust hole is arranged in the auxiliary exhaust hole; the main control assembly controls the opening size of the main exhaust valve; the auxiliary assembly is connected with the main control assembly and controls the opening size of the auxiliary exhaust hole; wherein the auxiliary exhaust valve is in a normally closed state, and the main control assembly drives the auxiliary assembly and controls the auxiliary exhaust valve to open the auxiliary exhaust hole.

Description

Technical Field

[0001] The present invention relates to the technical field of two-stroke engines, and more specifically, to a variable exhaust port device of a two-stroke engine. Background Art

[0002] A two-stroke engine is an engine that completes a working cycle in two strokes. The engine performs work once when the crankshaft rotates one circle. There are three holes distributed on the cylinder block of a two-stroke engine, namely the intake hole, the exhaust hole and the ventilation hole. These three holes are closed by the piston at a certain time. Its working cycle includes two strokes: (1) The first stroke: the piston moves upward from the bottom dead center, and after the three holes are closed at the same time, the mixture entering the cylinder is compressed; when the intake hole is exposed, the combustible mixture flows into the crankcase. (2) The second stroke: when the piston is compressed to near the top dead center, the spark plug ignites the combustible mixture, and the expansion of the combustion gas pushes the piston downward to perform work. At this time, the intake hole is closed, and the combustible mixture enclosed in the crankcase is compressed; when the piston approaches the bottom dead center, the exhaust hole opens, and the exhaust gas rushes out; then the ventilation hole opens, and the pre-compressed combustible mixture rushes into the cylinder, expelling the exhaust gas, and the ventilation process begins.

[0003] In the prior art, although the exhaust gas can be discharged through the exhaust hole, a part of the exhaust gas will still remain in the cylinder, affecting the next work done by the combustible gas. In addition, as the engine power increases, the frequency of piston movement increases, and the influence of the exhaust gas remaining in the cylinder on the engine work will gradually increase. Therefore, the exhaust hole in the prior art is usually set to an exhaust hole with an adjustable opening size to adapt to the change of engine power. However, this method of adjusting the size of the exhaust hole still limits the exhaust efficiency of the exhaust gas when the engine is running at high speed, and cannot achieve the optimal exhaust state.

[0004] Therefore, how to further improve the exhaust efficiency of engine exhaust gas when the engine is running at high speed is a problem that we urgently need to solve. Summary of the invention

[0005] The present invention overcomes the disadvantage that although an exhaust hole with a variable opening size is provided in a two-stroke engine in the prior art, the exhaust efficiency of the exhaust gas is still limited when the engine runs at a high speed and needs to be further improved. A variable exhaust port device for a two-stroke engine is provided, which can not only adjust the size of the exhaust port as the engine power increases, but also provides an auxiliary exhaust hole. When the engine power increases to a certain level, the auxiliary exhaust hole is opened, which can further improve the exhaust efficiency of the engine exhaust gas and increase the engine power.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a variable exhaust port device for a two-stroke engine, comprising: A cylinder body, wherein a main exhaust hole and an auxiliary exhaust hole are arranged on the inner side wall of the cylinder body, a main exhaust valve for controlling the opening size of the main exhaust hole is arranged in the main exhaust hole, and an auxiliary exhaust valve for controlling the opening size of the auxiliary exhaust hole is arranged in the auxiliary exhaust hole; Main control assembly, controlling the opening size of the main exhaust valve; An auxiliary component, connected to the main control component, controls the opening size of the auxiliary exhaust hole; Among them, the auxiliary exhaust valve is in a normally closed state, and the main control component drives the auxiliary component to control the auxiliary exhaust valve to open the auxiliary exhaust hole.

[0007] In the present application, by providing an auxiliary exhaust hole, when the engine power increases to a certain extent, the auxiliary exhaust hole can be automatically opened, thereby further improving the exhaust efficiency of the exhaust gas in the cylinder cavity. In addition, the auxiliary exhaust valve and the column exhaust valve are controlled and linked by the same set of mechanisms, so that after the main exhaust hole is opened to a certain extent, the auxiliary exhaust hole can also be automatically opened, which has the characteristics of compact structure and stable function.

[0008] Preferably, the main control component includes a control rod and an actuator inserted into the cylinder body, and the actuator drives the control rod to rotate; a control gear is provided at the end of the control rod; valve core rotating shafts are provided at both ends of the main exhaust valve, and the valve core rotating shafts at both ends are rotatably arranged on the cylinder body, and a control arm is provided at the end of the valve core rotating shaft at one end; the control rod drives the control gear to rotate, and the control gear drives the control arm to rotate.

[0009] When the control gear rotates, it will drive the control arm to rotate, and the control arm will drive the valve core main shaft to rotate, so that the main valve core can rotate around the valve core rotating shaft. The end of the main valve core away from the valve core main shaft will swing at the main intake end, thereby controlling the size of the main intake end opening.

[0010] Preferably, a first slide groove is arranged on the end face of the control gear, and the distance between the first slide groove and the center of the control gear gradually decreases; a first boss is arranged on the control arm, and the first boss is arranged in the first slide groove.

[0011] In the initial position, the first boss is at the far end of the slide groove. As the engine power increases, the actuator drives the control rod to rotate, and the control rod drives the control gear to rotate. The first boss moves in the first slide groove as the control gear rotates. The first boss moves in the first slide groove toward the proximal end of the slide groove, driving the control arm to rotate, so that the main valve core can rotate around the valve core shaft as the center, and the end of the main valve core away from the valve core main shaft will swing at the main intake end, thereby controlling the main intake end opening to gradually increase.

[0012] Preferably, two auxiliary exhaust holes are provided, and the two auxiliary exhaust holes are arranged on both sides of the main exhaust hole; control gears are provided at both ends of the control rod, and the control gears at both ends control the auxiliary exhaust valves through auxiliary components respectively.

[0013] The two auxiliary exhaust holes can improve the exhaust efficiency of the exhaust gas, and the auxiliary exhaust valves in the two auxiliary exhaust holes are controlled by a control rod, making the overall structure more compact.

[0014] Preferably, a limit stopper is provided at the end of the control arm, and when the main exhaust valve is in the initial position, the limit stopper abuts against the control rod.

[0015] The limit stopper abuts against the control rod, and the limit stopper can keep the control arm in an initial state.

[0016] Preferably, the auxiliary component comprises an auxiliary gear fixedly connected to the auxiliary exhaust valve, and a second protrusion is arranged on the end face of the auxiliary gear; a second slide groove and a control tooth are arranged in sequence on the edge of the control gear.

[0017] As the engine power increases, the control tooth meshes with the auxiliary gear, and then as the control gear rotates, the auxiliary gear also rotates. At this time, the auxiliary exhaust hole opens, and the opening will gradually increase as the power increases, thereby increasing the engine's exhaust volume and helping to improve the engine's power.

[0018] Preferably, the auxiliary gears are symmetrically arranged along a line connecting the second boss and the rotation center.

[0019] The auxiliary gear is symmetrically arranged along the line connecting the second boss and the rotation center, so that the gear can be installed on the left side of the cylinder body and also on the right side of the cylinder body, thereby improving the interchangeability of the parts.

[0020] Preferably, the auxiliary exhaust valve comprises a cylindrical valve head, the cylindrical valve head is perpendicular to the auxiliary exhaust hole, and a valve channel perpendicular to the axis of the cylindrical valve head is arranged on the cylindrical valve head.

[0021] The cylindrical valve head is provided with a valve channel perpendicular to its axis, so that the cylindrical valve head forms a U-shaped structure. The end of the cylindrical valve head away from the valve channel is fixedly connected to the auxiliary gear, and the opening size of the auxiliary exhaust hole can be controlled by rotating the cylindrical valve head.

[0022] Preferably, the control gear is a fan-shaped structure.

[0023] The control gear adopts a fan-shaped structure, which can save installation space, make the overall structure more compact, and help reduce the overall size of the engine.

[0024] Preferably, the second protrusion and the edge of the auxiliary gear are provided with an arc transition section, and the arc transition section fits with the edge of the control gear.

[0025] The arc transition section fits with the arc edge of the control gear, that is, the curvature of the arc transition section is the same as the curvature of the arc edge on the control gear, thereby ensuring that after the engine power is reduced, the position of the auxiliary gear can remain unchanged, that is, the opening of the auxiliary exhaust hole can remain in a normally closed state.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application sets an auxiliary exhaust hole so that when the engine power increases to a certain extent, the auxiliary exhaust hole can be automatically opened, thereby further improving the exhaust efficiency of the exhaust gas in the cylinder cavity, improving the power of the engine, and also being able to adapt to engines with greater power. Moreover, the auxiliary exhaust valve and the column exhaust valve are controlled and linked by the same set of mechanisms, so that after the main exhaust hole is opened to a certain extent, the auxiliary exhaust hole can also be automatically opened, which has the characteristics of compact structure and stable function. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0028] Figure 2 It is an exploded schematic diagram of the present invention.

[0029] Figure 3 It is a schematic explosion diagram from another angle of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the main exhaust valve and the auxiliary exhaust valve of the present invention.

[0031] Figure 5 It is the auxiliary gear of the present invention.

[0032] Figure 6 It is a front view of the control arm of the present invention.

[0033] Figure 7 It is a three-dimensional structural diagram of the columnar valve head of the present invention.

[0034] Figure 8 It is a three-dimensional structural diagram of the control arm of the present invention.

[0035] Fig. 9 It is a schematic structural diagram of the coordination between the control gear, the control arm and the auxiliary gear of the present invention.

[0036] Fig.10 It is a schematic structural diagram of the cooperation between the control gear, the control arm and the auxiliary gear from another angle of the present invention.

[0037] Fig.11It is a top view of the cylinder block of the present invention.

[0038] Fig.12 It is a cross-sectional view of the cylinder block of the present invention taken along the AA direction.

[0039] Fig.13 It is a cross-sectional view of the cylinder block of the present invention taken along the BB direction.

[0040] In the figure: 1, cylinder body, 11, main exhaust hole, 111, main air inlet end, 112, main air outlet end, 12, auxiliary exhaust hole, 121, auxiliary air inlet end, 122, auxiliary air outlet end, 123, side wall perforation, 13, cylinder chamber; 2. Main control assembly, 21. Actuator, 22. Control rod, 23. Control gear, 231. First slide slot, 232. Far end of slide slot, 233. Near end of slide slot, 234. Second slide slot, 235. Control tooth, 236. Arc edge, 24. Control arm, 241. First boss, 242. Limit stopper; 3. Auxiliary gear, 31. Second protruding column, 32. Arc transition section; 4. main exhaust valve, 41. main valve core, 42. valve core rotating shaft, 43. cylindrical surface; 5. Auxiliary exhaust valve, 51. Column valve head, 52. Valve channel; 6. Exhaust valve cover, 61. Exhaust valve hole. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figures 1 to 13 As shown, a variable exhaust port device for a two-stroke engine includes: a cylinder body 1, a main control component 2, and an auxiliary component.

[0042] A main exhaust hole 11 and an auxiliary exhaust hole 12 are provided on the side wall of the cylinder body 1. A main exhaust valve 4 for controlling the opening size of the main exhaust hole 11 is provided, and an auxiliary exhaust valve 5 for controlling the opening size of the auxiliary exhaust hole 12 is provided. The main control component 2 controls the opening size of the main exhaust valve 4; An auxiliary component, connected to the main control component 2, controls the opening size of the auxiliary exhaust hole 12; The auxiliary exhaust valve 5 is in a normally closed state, and the main control component 2 drives the auxiliary component to control the auxiliary exhaust valve 5 to open the auxiliary exhaust hole 12 .

[0043] The cylinder body 1 has a cylinder cavity 13 disposed therein, and the main exhaust hole 11 and the auxiliary exhaust hole 12 are both disposed through the inner wall of the cylinder body 1. An exhaust valve cover 6 is disposed at the outer end of the main exhaust hole 11, and an exhaust valve hole 61 is disposed on the exhaust valve cover 6.

[0044] like Fig.12 As shown, the end of the main exhaust hole 11 close to the cylinder chamber 13 is the main air intake end 111, and the end of the main exhaust hole 11 close to the outer wall of the cylinder body 1 is the main air outlet end 112. The end of the auxiliary exhaust hole 12 close to the cylinder chamber 13 is the auxiliary air intake end 121, and the end of the auxiliary exhaust hole 12 close to the outer wall of the cylinder body 1 is the auxiliary air outlet end 122.

[0045] The main intake end 111 and the auxiliary intake end 121 are separated on the inner wall of the cylinder body 1, and the auxiliary outlet end 122 is arranged on the inner wall of the main exhaust hole 11. That is, the exhaust gas enters the main exhaust hole 11 and the auxiliary exhaust hole 12 respectively, and then is collected from the main exhaust hole 11 and finally discharged from the exhaust valve hole 61.

[0046] like Figures 2 to 4 As shown, the main control assembly 2 is used to control the size of the opening of the main exhaust valve 4. The main control assembly 2 includes a control rod 22 and an actuator 21 that are inserted into the cylinder body 1. The actuator 21 drives the control rod 22 to rotate; a control gear 23 is provided at the end of the control rod 22; valve core rotating shafts 42 are provided at both ends of the main exhaust valve 4, and the valve core rotating shafts 42 at both ends are rotatably arranged on the cylinder body 1, and a control arm 24 is provided at the end of the valve core rotating shaft 42 at one end; the control rod 22 drives the control gear 23 to rotate, and the control gear 23 drives the control arm 24 to rotate.

[0047] The actuator 21 in this embodiment adopts a motor, and the output end of the motor is connected to the end of the control rod 22. The rotation of the motor drives the rotation of the control rod 22. The control gear 23 adopts a fan-shaped gear, which can save installation space, make the overall structure more compact, and help reduce the overall size of the engine.

[0048] like Figure 4 As shown, the control gear 23 is sleeved on the periphery of the end of the control rod 22, and the control gear 23 and the control rod 22 are fixedly connected. When the control rod 22 rotates, it can drive the control gear 23 to rotate. The main exhaust valve 4 includes a main valve core 41 and a valve core rotating shaft 42 arranged at both ends of the main valve core 41. A cylindrical surface 43 is arranged on the column valve core, and the valve core rotating shaft 42 is arranged at one end of the axial direction of the cylindrical surface 43. Two main installation grooves are arranged at the outer wall of the main cylinder and at a position corresponding to the main air outlet end 112. The two main installation grooves are arranged on both sides of the main air outlet end 112. The two valve core rotating shafts 42 are respectively arranged in the two column installation grooves, and then the valve core rotating shaft 42 is fixed by the exhaust valve cover 6. The valve core rotating shaft 42 is clamped between the exhaust valve cover 6 and the cylinder body 1. The exhaust valve cover 6 in this embodiment is fixedly installed on the outer wall of the cylinder body 1 by multiple bolts.

[0049] One of the two valve core main shafts is connected to the control arm 24, and the control arm 24 is arranged at the end of the valve core rotating shaft 42. When the control gear 23 rotates, it will drive the control arm 24 to rotate, and the control arm 24 drives the valve core main shaft to rotate, so that the main valve core 41 can rotate around the valve core rotating shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main air inlet end 111, thereby controlling the size of the opening of the main air inlet end 111.

[0050] like Figures 5 to 10 As shown, the control gear 23 and the control arm 24 can be transmitted by gear meshing. In this embodiment, a first slide groove 231 is provided on the end surface of the control gear 23. The shape of the first slide groove 231 is an arc. The first slide groove 231 is an arc with a changing radius, that is, the distance between the first slide groove 231 and the center of the control gear 23 gradually decreases; a first protrusion 241 is provided on the control arm 24, and the first protrusion 241 is arranged in the first slide groove 231. The position of the first slide groove 231 away from the center of the control gear 23 is the slide groove distal end 232, and the position of the first slide groove 231 close to the center of the control gear 23 is the slide groove proximal end 233. In the initial position, the first boss 241 is at the far end 232 of the slide groove. As the engine power increases, the actuator 21 drives the control rod 22 to rotate, and the control rod 22 drives the control gear 23 to rotate. The first boss 241 moves in the first slide groove 231 as the control gear 23 rotates. The first boss 241 moves in the first slide groove 231 toward the proximal end 233 of the slide groove, driving the control arm 24 to rotate, so that the main valve core 41 can rotate around the valve core shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main intake end 111, thereby controlling the main intake end 111 opening to gradually increase.

[0051] In addition, a limit stopper 242 is provided at the end of the control arm 24. When the main exhaust valve 4 is in the initial position, the limit stopper 242 abuts against the control rod 22. The limit stopper 242 can keep the control arm 24 in the initial state.

[0052] The auxiliary component is linked with the main control component 2, so that when the main exhaust hole 11 is opened to a certain size, the auxiliary exhaust hole 12 can be controlled to open. The auxiliary component includes an auxiliary gear 31 fixedly connected to the auxiliary exhaust valve 5, and a second protrusion 311 is arranged on the end face of the auxiliary gear 31; an arc edge 236 is arranged on the edge of the control gear 23, and a control tooth 235 is arranged at the end of the arc edge 236, and a second slide groove 234 is arranged at the end of the arc edge 236 away from the control tooth 235, and the second slide groove 234 is arranged in parallel with the arc edge 236, that is, the second slide groove 234 is arranged along the thickness direction of the control gear 23, and the second slide groove 234 and the control tooth 235; the second slide groove 234 is an arc centered at the center of the control gear 23.

[0053] The auxiliary exhaust valve 5 includes a cylindrical valve head 51. A side wall through hole 123 is provided on the side wall of the auxiliary exhaust hole 12. The cylindrical valve head 51 passes through the side wall through hole 123 and is installed in the auxiliary exhaust hole 12. The axis of the cylindrical valve head 51 is perpendicular to the axis of the auxiliary exhaust hole 12. A valve channel 52 perpendicular to the axis is provided on the cylindrical valve head 51, so that the cylindrical valve head 51 forms a U-shaped structure. The end of the cylindrical valve head 51 away from the valve channel 52 is fixedly connected to the auxiliary gear 31, and the opening size of the auxiliary exhaust hole 12 can be controlled by rotating the cylindrical valve head 51.

[0054] The working principle of this embodiment is as follows: in the initial state, the auxiliary exhaust hole 12 is closed; the main exhaust valve 4 is in the initial state, and the main intake end 111 is in the state of minimum opening; As the engine power increases, the actuator 21 receives a signal from the engine power increase, and the actuator 21 drives the control rod 22 to rotate, and the control rod 22 drives the control gear 23 to rotate, so that the first protrusion 241 moves in the first slide groove 231 toward the slide groove proximal end 233, so that the control arm 24 rotates, so that the main valve core 41 can rotate around the valve core rotating shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main intake end 111, so as to control the main intake end 111 to gradually increase the opening. In this process, since the second protrusion 311 is always sliding in the second slide groove 234, the control tooth 235 is not engaged with the auxiliary gear 31, and therefore, the position of the second protrusion 311 does not change, and the auxiliary exhaust valve 5 will not open, and still remain in the normally closed state.

[0055] As the engine power further increases, the control tooth 235 meshes with the auxiliary gear 31, and then as the control gear 23 rotates, the auxiliary gear 31 also rotates. At this time, the auxiliary exhaust hole 12 is opened, and the opening will gradually increase as the power increases, thereby increasing the exhaust volume of the engine and helping to improve the engine power.

[0056] Afterwards, as the engine power gradually decreases, the control tooth 235 is reset, driving the auxiliary gear 31 to reset, so that the auxiliary exhaust hole 12 remains in a normally closed state; at the same time, the first slide groove 231 drives the first protrusion 241 to slide, so that the control arm 24 is reset. It should be noted that an arc transition section 312 is provided at the edge of the second protrusion 311 and the auxiliary gear 31, and the arc transition section 312 fits the arc edge 236 of the control gear 23, that is, the arc of the arc transition section 312 is the same as the arc of the arc edge 236 on the control gear 23, so as to ensure that the position of the auxiliary gear 31 can remain unchanged after the engine power decreases, that is, the opening of the auxiliary exhaust hole 12 can remain in a normally closed state.

[0057] In the present application, by providing the auxiliary exhaust hole 12, when the engine power increases to a certain extent, the auxiliary exhaust hole 12 can be automatically opened, thereby further improving the exhaust efficiency of the exhaust gas in the cylinder chamber 13. In addition, the auxiliary exhaust valve 5 and the column exhaust valve are controlled and linked by the same set of mechanisms, so that after the main exhaust hole 11 is opened to a certain extent, the auxiliary exhaust hole 12 can also be automatically opened, which has the characteristics of compact structure and stable function.

[0058] Embodiment 2: Reference Figures 1 to 13 As shown, a variable exhaust port device for a two-stroke engine includes: a cylinder body 1, a main control component 2, and an auxiliary component.

[0059] A main exhaust hole 11 and an auxiliary exhaust hole 12 are provided on the side wall of the cylinder body 1. A main exhaust valve 4 for controlling the opening size of the main exhaust hole 11 is provided, and an auxiliary exhaust valve 5 for controlling the opening size of the auxiliary exhaust hole 12 is provided. The main control component 2 controls the opening size of the main exhaust valve 4; An auxiliary component, connected to the main control component 2, controls the opening size of the auxiliary exhaust hole 12; The auxiliary exhaust valve 5 is in a normally closed state, and the main control component 2 drives the auxiliary component to control the auxiliary exhaust valve 5 to open the auxiliary exhaust hole 12 .

[0060] The cylinder body 1 has a cylinder cavity 13 disposed therein, and the main exhaust hole 11 and the auxiliary exhaust hole 12 are both disposed through the inner wall of the cylinder body 1. An exhaust valve cover 6 is disposed at the outer end of the main exhaust hole 11, and an exhaust valve hole 61 is disposed on the exhaust valve cover 6.

[0061] like Fig.12 As shown, the end of the main exhaust hole 11 close to the cylinder chamber 13 is the main air intake end 111, and the end of the main exhaust hole 11 close to the outer wall of the cylinder body 1 is the main air outlet end 112. The end of the auxiliary exhaust hole 12 close to the cylinder chamber 13 is the auxiliary air intake end 121, and the end of the auxiliary exhaust hole 12 close to the outer wall of the cylinder body 1 is the auxiliary air outlet end 122.

[0062] The main intake end 111 and the auxiliary intake end 121 are separated on the inner wall of the cylinder body 1, and the auxiliary outlet end 122 is arranged on the inner wall of the main exhaust hole 11. That is, the exhaust gas enters the main exhaust hole 11 and the auxiliary exhaust hole 12 respectively, and then is collected from the main exhaust hole 11 and finally discharged from the exhaust valve hole 61.

[0063] like Figures 2 to 4As shown, the main control assembly 2 is used to control the size of the opening of the main exhaust valve 4. The main control assembly 2 includes a control rod 22 and an actuator 21 that are inserted into the cylinder body 1. The actuator 21 drives the control rod 22 to rotate; a control gear 23 is provided at the end of the control rod 22; valve core rotating shafts 42 are provided at both ends of the main exhaust valve 4, and the valve core rotating shafts 42 at both ends are rotatably arranged on the cylinder body 1, and a control arm 24 is provided at the end of the valve core rotating shaft 42 at one end; the control rod 22 drives the control gear 23 to rotate, and the control gear 23 drives the control arm 24 to rotate.

[0064] The actuator 21 in this embodiment adopts a motor, and the output end of the motor is connected to the end of the control rod 22. The rotation of the motor drives the rotation of the control rod 22. The control gear 23 adopts a fan-shaped gear, which can save installation space, make the overall structure more compact, and help reduce the overall size of the engine.

[0065] like Figure 4 As shown, the control gear 23 is sleeved on the periphery of the end of the control rod 22, and the control gear 23 and the control rod 22 are fixedly connected. When the control rod 22 rotates, it can drive the control gear 23 to rotate. The main exhaust valve 4 includes a main valve core 41 and a valve core rotating shaft 42 arranged at both ends of the main valve core 41. A cylindrical surface 43 is arranged on the column valve core, and the valve core rotating shaft 42 is arranged at one end of the axial direction of the cylindrical surface 43. Two main installation grooves are arranged at the outer wall of the main cylinder and at a position corresponding to the main air outlet end 112. The two main installation grooves are arranged on both sides of the main air outlet end 112. The two valve core rotating shafts 42 are respectively arranged in the two column installation grooves, and then the valve core rotating shaft 42 is fixed by the exhaust valve cover 6. The valve core rotating shaft 42 is clamped between the exhaust valve cover 6 and the cylinder body 1. The exhaust valve cover 6 in this embodiment is fixedly installed on the outer wall of the cylinder body 1 by multiple bolts.

[0066] One of the two valve core main shafts is connected to the control arm 24, and the control arm 24 is arranged at the end of the valve core rotating shaft 42. When the control gear 23 rotates, it will drive the control arm 24 to rotate, and the control arm 24 drives the valve core main shaft to rotate, so that the main valve core 41 can rotate around the valve core rotating shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main air inlet end 111, thereby controlling the size of the opening of the main air inlet end 111.

[0067] like Figures 5 to 10As shown, the control gear 23 and the control arm 24 can be transmitted by gear meshing. In this embodiment, a first slide groove 231 is provided on the end surface of the control gear 23. The shape of the first slide groove 231 is an arc. The first slide groove 231 is an arc with a changing radius, that is, the distance between the first slide groove 231 and the center of the control gear 23 gradually decreases; a first protrusion 241 is provided on the control arm 24, and the first protrusion 241 is arranged in the first slide groove 231. The position of the first slide groove 231 away from the center of the control gear 23 is the slide groove distal end 232, and the position of the first slide groove 231 close to the center of the control gear 23 is the slide groove proximal end 233. In the initial position, the first boss 241 is at the far end 232 of the slide groove. As the engine power increases, the actuator 21 drives the control rod 22 to rotate, and the control rod 22 drives the control gear 23 to rotate. The first boss 241 moves in the first slide groove 231 as the control gear 23 rotates. The first boss 241 moves in the first slide groove 231 toward the proximal end 233 of the slide groove, driving the control arm 24 to rotate, so that the main valve core 41 can rotate around the valve core shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main intake end 111, thereby controlling the main intake end 111 opening to gradually increase.

[0068] In addition, a limit stopper 242 is provided at the end of the control arm 24. When the main exhaust valve 4 is in the initial position, the limit stopper 242 abuts against the control rod 22. The limit stopper 242 can keep the control arm 24 in the initial state.

[0069] The auxiliary component is linked with the main control component 2, so that when the main exhaust hole 11 is opened to a certain size, the auxiliary exhaust hole 12 can be controlled to open. The auxiliary component includes an auxiliary gear 31 fixedly connected to the auxiliary exhaust valve 5, and a second protrusion 311 is arranged on the end face of the auxiliary gear 31; an arc edge 236 is arranged on the edge of the control gear 23, and a control tooth 235 is arranged at the end of the arc edge 236, and a second slide groove 234 is arranged at the end of the arc edge 236 away from the control tooth 235, and the second slide groove 234 is arranged in parallel with the arc edge 236, that is, the second slide groove 234 is arranged along the thickness direction of the control gear 23, and the second slide groove 234 and the control tooth 235; the second slide groove 234 is an arc centered at the center of the control gear 23.

[0070] The auxiliary exhaust valve 5 includes a cylindrical valve head 51. A side wall through hole 123 is provided on the side wall of the auxiliary exhaust hole 12. The cylindrical valve head 51 passes through the side wall through hole 123 and is installed in the auxiliary exhaust hole 12. The axis of the cylindrical valve head 51 is perpendicular to the axis of the auxiliary exhaust hole 12. A valve channel 52 perpendicular to the axis is provided on the cylindrical valve head 51, so that the cylindrical valve head 51 forms a U-shaped structure. The end of the cylindrical valve head 51 away from the valve channel 52 is fixedly connected to the auxiliary gear 31, and the opening size of the auxiliary exhaust hole 12 can be controlled by rotating the cylindrical valve head 51.

[0071] This embodiment is different from Embodiment 1 in that Fig.12 and Fig.13 As shown, in this embodiment, two auxiliary exhaust holes 12 are provided, and the two auxiliary exhaust holes 12 are provided on both sides of the main exhaust hole 11. An auxiliary exhaust valve 5 is provided in each of the two auxiliary exhaust holes 12; control gears 23 are provided at both ends of the control rod 22, and the control gears 23 at both ends drive the auxiliary exhaust valve 5 by cooperating with an auxiliary gear 3 respectively.

[0072] The working principle of this embodiment is as follows: in the initial state, the auxiliary exhaust hole 12 is closed; the main exhaust valve 4 is in the initial state, and the main intake end 111 is in the state of minimum opening; As the engine power increases, the actuator 21 receives a signal from the engine power increase, and the actuator 21 drives the control rod 22 to rotate, and the control rod 22 drives the control gear 23 to rotate, so that the first protrusion 241 moves in the first slide groove 231 toward the slide groove proximal end 233, so that the control arm 24 rotates, so that the main valve core 41 can rotate around the valve core rotating shaft 42 as the center, and the end of the main valve core 41 away from the valve core main shaft will swing at the main intake end 111, so as to control the main intake end 111 to gradually increase the opening. In this process, since the second protrusion 311 is always sliding in the second slide groove 234, the control tooth 235 is not engaged with the auxiliary gear 31, and therefore, the position of the second protrusion 311 does not change, and the auxiliary exhaust valve 5 will not open, and still remain in the normally closed state.

[0073] As the engine power further increases, the control tooth 235 meshes with the auxiliary gear 31, and then as the control gear 23 rotates, the auxiliary gear 31 also rotates. At this time, the auxiliary exhaust hole 12 is opened, and the opening will gradually increase as the power increases, thereby increasing the exhaust volume of the engine and helping to improve the engine power.

[0074] Afterwards, as the engine power gradually decreases, the control tooth 235 is reset, driving the auxiliary gear 31 to reset, so that the auxiliary exhaust hole 12 remains in a normally closed state; at the same time, the first slide groove 231 drives the first protrusion 241 to slide, so that the control arm 24 is reset. It should be noted that an arc transition section 312 is provided at the edge of the second protrusion 311 and the auxiliary gear 31, and the arc transition section 312 fits the arc edge 236 of the control gear 23, that is, the arc of the arc transition section 312 is the same as the arc of the arc edge 236 on the control gear 23, so as to ensure that the position of the auxiliary gear 31 can remain unchanged after the engine power decreases, that is, the opening of the auxiliary exhaust hole 12 can remain in a normally closed state.

[0075] In the present application, by providing the auxiliary exhaust hole 12, when the engine power increases to a certain extent, the auxiliary exhaust hole 12 can be automatically opened, thereby further improving the exhaust efficiency of the exhaust gas in the cylinder chamber 13. In addition, the auxiliary exhaust valve 5 and the column exhaust valve are controlled and linked by the same set of mechanisms, so that after the main exhaust hole 11 is opened to a certain extent, the auxiliary exhaust hole 12 can also be automatically opened, which has the characteristics of compact structure and stable function.

[0076] Example 3: Reference Figure 5 As shown, the structure of this embodiment is similar to that of the embodiment 2, except that the auxiliary gear 31 is symmetrically arranged along the line connecting the second boss 311 and the rotation center. The auxiliary gear 31 is symmetrically arranged along the line connecting the second boss 311 and the rotation center, so that the gear can be installed on the left side of the cylinder body 1 or on the right side of the cylinder body 1, thereby improving the interchangeability of the parts.

[0077] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A variable exhaust port device for a two-stroke engine, characterized in that: include: A cylinder body, wherein a main exhaust hole and an auxiliary exhaust hole are arranged on the inner side wall of the cylinder body, a main exhaust valve for controlling the opening size of the main exhaust hole is arranged in the main exhaust hole, and an auxiliary exhaust valve for controlling the opening size of the auxiliary exhaust hole is arranged in the auxiliary exhaust hole; Main control assembly, controlling the opening size of the main exhaust valve; An auxiliary component, connected to the main control component, controls the opening size of the auxiliary exhaust hole; Among them, the auxiliary exhaust valve is in a normally closed state, and the main control component drives the auxiliary component to control the auxiliary exhaust valve to open the auxiliary exhaust hole.

2. The variable exhaust port device for a two-stroke engine according to claim 1, characterized in that: The main control assembly includes a control rod and an actuator which are inserted into the cylinder body, and the actuator drives the control rod to rotate; a control gear is arranged at the end of the control rod; valve core rotating shafts are arranged at both ends of the main exhaust valve, and the valve core rotating shafts at both ends are rotatably arranged on the cylinder body, and a control arm is arranged at the end of the valve core rotating shaft at one end; the control rod drives the control gear to rotate, and the control gear drives the control arm to rotate.

3. The variable exhaust port device for a two-stroke engine according to claim 2, characterized in that: A first slide groove is arranged on the end surface of the control gear, and the distance between the first slide groove and the center of the control gear gradually decreases; a first protrusion is arranged on the control arm, and the first protrusion is arranged in the first slide groove.

4. The variable exhaust port device for a two-stroke engine according to claim 2, characterized in that: There are two auxiliary exhaust holes, which are arranged on both sides of the main exhaust hole; control gears are arranged at both ends of the control rod, and the control gears at both ends control the auxiliary exhaust valves through auxiliary components respectively.

5. The variable exhaust port device for a two-stroke engine according to any one of claims 2 to 4, characterized in that: A limit stopper is arranged at the end of the control arm, and when the main exhaust valve is at the initial position, the limit stopper abuts against the control rod.

6. The variable exhaust port device for a two-stroke engine according to any one of claims 2 to 4, characterized in that: The auxiliary component comprises an auxiliary gear fixedly connected to the auxiliary exhaust valve, and a second protruding column is arranged on the end face of the auxiliary gear; a second sliding groove and a control tooth are arranged in sequence on the edge of the control gear.

7. The variable exhaust port device for a two-stroke engine according to claim 6, characterized in that: The auxiliary gears are symmetrically arranged along a line connecting the second protruding column and the rotation center.

8. The variable exhaust port device for a two-stroke engine according to any one of claims 1 to 4, characterized in that: The auxiliary exhaust valve comprises a cylindrical valve head, which is perpendicular to the auxiliary exhaust hole and is provided with a valve channel which is perpendicular to the axis thereof.

9. The variable exhaust port device for a two-stroke engine according to any one of claims 2 to 4, characterized in that: The control gear is a fan-shaped structure.

10. The variable exhaust port device for a two-stroke engine according to claim 6, characterized in that: The second protruding column and the edge of the auxiliary gear are provided with an arc transition section, and the arc transition section is fitted with the edge of the control gear.

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