Two-stroke gasoline engine cylinder gasket

Abstract

The utility model relates to the technical field of energy conservation and emission reduction of gasoline engines, in particular to a cylinder gasket of a two-stroke gasoline engine, which is characterized in that two multi-through-hole units are symmetrically arranged on a gasket body by taking the center as the center, each multi-through-hole unit is provided with three through holes and at least comprises a large through hole with the area of A and a small through hole with the area of 35-40% A which are distributed at intervals, and the large through hole and the small through hole are communicated with each other. At least two through holes distributed at intervals are internally tangent to the right contour line of the right scavenging duct and the left contour line of the left scavenging duct of the corresponding cylinder body respectively, all the through holes are located in the outer contour lines of the corresponding scavenging ducts, and the total area of the through holes accounts for 30%-35% of the cross section of the corresponding right scavenging duct or the corresponding left scavenging duct. The three air flows with different speeds form a canyon effect and a part of vortex at the same time, so that air and oil gas in mixed gas are uniformly mixed, the air flow speed is increased, atomization of fuel is promoted, the combustion efficiency is improved, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving and emission reduction of gasoline engines, in particular to a cylinder gasket of a two-stroke gasoline engine. Background Art

[0002] With the improvement of people's living standards, agricultural and forestry machinery powered by small gasoline engines has entered thousands of households. Not only has the work efficiency been greatly improved, freeing people from heavy physical labor, but also the current problem of lack of rural labor has been solved. At the same time, people's awareness of energy conservation and environmental protection has gradually increased, but the rising oil prices have brought increasing pressure on people.

[0003] At present, the cylinders of two-stroke engines all use the method of pre-storing a portion of air in the left and right scavenging ducts of the cylinder. After the piston reaches the top dead center and moves downward, as the exhaust port is fully opened, the scavenging ports on both sides of the cylinder are gradually opened, and the air stored in the scavenging duct enters the combustion chamber first to scavenge air, reducing the amount of unburned mixed gas discharged with the waste, thereby reducing the emission of harmful gases such as HC and CO in the exhaust gas. However, tests have shown that when the machine is running at high speed, only a small amount of the air pre-stored in the semi-closed inner channel enters the scavenging passage for the first scavenging, and the exhaust gas in the combustion chamber is not completely scavenged. The mixture in the rear section continues to scavenge, and part of the mixture will be lost with the exhaust gas. Although some products are also provided with a throttle hole, the throttle hole is arranged near the scavenging port to slow down the discharge of the mixture and allow the air to scavenge first, but because the semi-closed channels on both sides of the piston are interconnected, the pre-stored air and the mixture gas in the scavenging passage are connected through the semi-closed channel of the piston, resulting in mutual mixing of the gases. During scavenging, not only air but also unburned mixture participates in the exhaust gas discharge. Not only a large amount of harmful compounds such as HC and CO are discharged in the exhaust gas, which is not conducive to environmental protection, but also the air and oil gas in the mixture are not fully mixed, resulting in incomplete combustion and waste of energy. Utility Model Content

[0004] The utility model discloses a two-stroke gasoline engine cylinder gasket, aiming to solve the technical problems existing in the prior art.

[0005] The utility model adopts the following technical solutions:

[0006] A two-stroke gasoline engine cylinder gasket, which is sleeved on a cylinder flange surface sealed with a crankcase, comprises a gasket body and a multi-through hole unit symmetrically arranged on the gasket body for connecting a right scavenging passage and a left scavenging passage to a crank chamber and a cylinder cavity respectively; wherein the gasket body is provided with a center hole matched and sleeved on a cylinder stop, and the two multi-through hole units are symmetrically arranged with the center vertical plane as the center plane, and the multi-through hole unit is provided with three through holes, including at least a large through hole with an area of ​​A and a small through hole with an area of ​​35%A to 40%A arranged in an interval, and at least two of the through holes arranged in an interval are respectively inscribed in the corresponding right contour line of the right scavenging passage and the left contour line of the left scavenging passage, and all the through holes are located within the corresponding outer contour line of the scavenging passage, so that the total area of ​​the through holes accounts for 30% to 35% of the cross section of the corresponding right scavenging passage or the left scavenging passage.

[0007] In some embodiments, the multi-through hole unit is provided with two large through holes and one small through hole, the small through hole is located on the horizontal center line of the center hole, and the two large through holes are arranged on the longitudinal center lines on both sides of the small through hole; the two large through holes corresponding to the right scavenging duct are both inscribed in the right contour line, and the two large through holes corresponding to the left scavenging duct are both inscribed in the left contour line.

[0008] In some embodiments, the two large through holes are symmetrically arranged on the longitudinal center line on both sides of the small through hole.

[0009] In some embodiments, the multi-through hole unit is provided with two small through holes and one large through hole, the large through hole is located on the horizontal center line of the central hole, and the two small through holes are arranged on both sides of the horizontal center line; the two small through holes corresponding to the right scavenging duct are both inscribed in the right contour line, and the two small through holes corresponding to the left scavenging duct are both inscribed in the left contour line.

[0010] In some embodiments, the two small through holes are symmetrically arranged on both sides of the horizontal center line.

[0011] In some embodiments, the minimum distance between the edge of any through hole of the multi-through hole unit and the edge of the gasket body should be no less than 1 mm.

[0012] In some embodiments, the thickness of the gasket body 1 should be no less than 0.5 mm.

[0013] In some embodiments, the outer dimensions of the gasket body correspond to the outer dimensions of the cylinder flange surface, and the gasket body is provided with a plurality of connection holes at the periphery, and fasteners fasten the crankcase and the cylinder body through the connection holes. Beneficial Effects

[0014] The utility model discloses a two-stroke gasoline engine cylinder gasket. Compared with the prior art, the utility model has the following advantages:

[0015] A two-stroke gasoline engine cylinder gasket, comprising two multi-hole units symmetrically arranged on a gasket body with a central vertical plane as a central plane, wherein the multi-hole unit is provided with three through holes, and at least comprises a large through hole with an area of ​​A and a small through hole with an area of ​​35%A to 40%A arranged at intervals, at least two through holes arranged at intervals are respectively inscribed in the right contour line of the right scavenging passage and the left contour line of the left scavenging passage of the corresponding cylinder body, all the through holes are located within the corresponding outer contour line of the scavenging passage, and the total area of ​​the through holes accounts for 30% to 35% of the cross section of the corresponding right scavenging passage or the left scavenging passage, that is, the corresponding scavenging passage cross section is blocked by 65% ​​to 70% of the multi-hole unit, so that a large pressure difference is generated between the crankshaft chamber and the right scavenging passage and the left scavenging passage of the cylinder body, and the mixed gas It is ejected at a very high speed from the large through hole and the small through hole with a large diameter difference, forming a canyon effect. At the same time, due to the rapid expansion, the atomization is uniform. In particular, through the setting of three through holes with different diameters, three airflows with different speeds form a canyon effect and also form partial vortices. In the process of quickly flowing through the scavenging duct with a longer path, the mixed gas continuously collides with the inner wall and is evenly atomized, which further improves the mixing uniformity of air and oil and gas in the mixed gas. After the mixed gas reaches the combustion chamber, it burns more fully. While increasing the air flow speed, it also promotes the atomization of the fuel, improves the combustion efficiency, and reduces the content of harmful components in the exhaust gas, that is, uses less fuel consumption to obtain the set power output, and effectively reduces the content of harmful components in the exhaust gas, achieving the effect of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for the description of the embodiment, which constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions explain the utility model and do not constitute an improper limitation on the utility model; in the drawings:

[0017] Figure 1 This is a schematic diagram of the technical solution structure of a two-stroke gasoline engine cylinder gasket disclosed in the first embodiment of the utility model (when the two large through holes are symmetrically arranged);

[0018] Figure 2 It is a schematic diagram of the technical solution structure for connecting the flange end of the cylinder body;

[0019] Figure 3 It is a schematic diagram of the technical solution structure when the gasket body is sleeved on the cylinder flange surface;

[0020] Figure 4 for Figure 3 A-direction view;

[0021] Figure 5 This is a schematic diagram of the technical solution structure of a two-stroke gasoline engine cylinder gasket disclosed in the second embodiment of the utility model (when the two large through holes are arranged asymmetrically);

[0022] Figure 6 This is a schematic diagram of the technical solution structure of a two-stroke gasoline engine cylinder gasket disclosed in the third embodiment of the utility model (when the two small through holes are symmetrically arranged);

[0023] Figure 7 This is a schematic diagram of the technical solution structure of a two-stroke gasoline engine cylinder gasket disclosed in the fourth embodiment of the utility model (when the two small through holes are arranged asymmetrically);

[0024] Figure 8 Schematic diagram of the mixture scavenging process when the piston reaches the bottom dead center.

[0025] In the figure:

[0026] Gasket body 1; multi-through hole unit 11; large through hole 111; small through hole 112; center hole 12; connecting hole 13; cylinder body 2; exhaust hole 21; right scavenging passage 22; right contour line 221; left scavenging passage 23; left contour line 231; cylinder body stop 24; cylinder body flange surface 25; cylinder cavity 26; piston 3; crankcase 4; crankshaft chamber 41. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings; in the description of the utility model, it should be noted that the "including" mentioned in the specification and claims is an open term, so it should be interpreted as "including but not limited to".

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0030] like Figure 1-Figure 8As shown, the technical solution disclosed by the utility model is:

[0031] A two-stroke gasoline engine cylinder gasket, which is mounted on a cylinder flange surface 25 sealed with a crankcase 4, comprises a gasket body 1 and a multi-hole unit symmetrically arranged on the gasket body 1 for connecting a right scavenging passage 22 and a left scavenging passage 23 with a crankcase 41 and a cylinder cavity respectively; wherein:

[0032] The gasket body 1 is provided with a center hole 12 that matches and fits on the cylinder stop 24. The two multi-through hole units 11 are symmetrically arranged with the center vertical plane as the center plane. The multi-through hole unit 11 is provided with three through holes, including at least a large through hole 111 with an area of ​​A and a small through hole 112 with an area of ​​35%A to 40%A, which are arranged in an interval. At least two of the through holes arranged in an interval are respectively inscribed in the corresponding right contour line 221 of the right scavenging duct 22 and the left contour line 231 of the left scavenging duct 23. The three through holes provided in the multi-through hole unit 11 corresponding to the right scavenging duct 22 are all located within the outer contour line of the right scavenging duct 22, and the three through holes provided in the multi-through hole unit 11 corresponding to the left scavenging duct 23 are all located within the outer contour line of the left scavenging duct 23, so that the total area of ​​the through holes accounts for 30% to 35% of the cross-section of the corresponding right scavenging duct or the left scavenging duct.

[0033] like Figure 1 to Figure 4 , Figure 8 As shown, the first preferred embodiment of the utility model:

[0034] A two-stroke gasoline engine cylinder gasket is sleeved on a cylinder flange surface 25. After a cylinder stop 24 is inserted into a connecting end of a crankcase 4, the cylinder 2 and the crankcase 4 are sealed and connected via fasteners.

[0035] The cylinder gasket is configured as a thin sheet gasket body 1, which is provided with a center hole 12 that matches and fits on the cylinder stop 24 and a multi-hole unit 11 that is symmetrically arranged on the left and right sides of the center hole 12. The two multi-hole units 11 are used to respectively connect the crankshaft chamber 41 with the right scavenging duct 22 and the left scavenging duct 23 of the cylinder cavity 26.

[0036] The multi-through-hole unit 11 is provided with three through holes, which are two large through holes 111 with an area of ​​A and one small through hole 112 with an area of ​​35%A to 40%A, and the large through hole 111 and the small through hole 112 are arranged at intervals. In this embodiment, the area of ​​the large through hole 111 is set to 20mm², and the area of ​​the small through hole 112 is set to 7mm². The specific setting of the area difference between the large through hole 111 and the small through hole 112, and the total area of ​​the three through holes accounts for 30% to 35% of the corresponding cross-section of the right scavenging passage 22 or the left scavenging passage 23, can ensure the formation of a canyon effect, so that the mixed gas expands rapidly after passing through the through holes and is evenly atomized. Because it is arranged on the cylinder gasket, the airflow mixing process passes through a longer scavenging passage, which can make the air and oil gas in the mixed gas collide and mix continuously, and are fully mixed before reaching the combustion chamber.

[0037] The small through hole 112 is located on the horizontal center line of the center hole 12, and the two large through holes 111 are symmetrically arranged on the longitudinal center lines on both sides of the small through hole 112, with a spacing of L. The two large through holes 111 corresponding to the right scavenging passage 22 are both inscribed on the right contour line 221 with a radius of R, and the two large through holes 111 corresponding to the left scavenging passage 23 are both inscribed on the left contour line 231 with a radius of R. Figure 1 , Figure 4 shown.

[0038] By symmetrically arranging two large through holes 111 on both sides of the small through hole 112 and inscribed in the right contour line 221 and the left contour line 231 respectively, three airflows with different speeds can be formed in the scavenging duct, with a fast speed in the middle and slow speeds on both sides. The airflows of the two large through holes 111 flow along the scavenging duct and continuously collide with the inner wall. Because the path is long, the number of collision and mixing of the three airflows is increased, thereby further improving the mixing uniformity of air and oil and gas in the mixture, and the mixture burns more fully after reaching the combustion chamber.

[0039] The minimum spacing S between the large through holes 111 and the small through holes 112 of the multi-through hole unit 11 and the edge of the gasket body 1 should be no less than 1 mm. In this embodiment, S=1 mm.

[0040] The thickness D of the gasket body 1 should be no less than 0.5 mm. In this embodiment, D=1 mm.

[0041] The outer dimensions of the gasket body 1 correspond to those of the cylinder flange surface 25, and four connecting holes 13 are provided on the periphery of the gasket body 1. The screws 5 are passed through the connecting holes of the cylinder 2, the connecting holes 13 of the gasket body 1, and the connecting holes of the crankcase 4 in sequence to tighten and seal the connection.

[0042] The working process of a two-stroke gasoline engine is as follows:

[0043] During the upward stroke of the piston 3, as the pressure in the crank chamber 41 decreases, the mixed gas is sucked into the crank chamber 41 from the carburetor under the action of atmospheric pressure and retained therein. When the mixed gas in the combustion chamber above the piston 3 is ignited and burns, the piston 3 moves downward under the push of the combustion gas, and the mixed gas in the crank chamber 41 and the scavenging passage is compressed. When approaching the bottom dead center, the exhaust port 21 is opened first, as shown in FIG. Figure 8 As shown, when the piston 3 continues to move downward, the scavenging port at the downstream end of the scavenging passage opens. In the initial stage of opening the scavenging port, the compressed mixed gas in the crank chamber 41 rushes to the downstream ends of the right scavenging passage 22 and the left scavenging passage 23, and the mixed gas is atomized uniformly through the large through hole 111 and the small through hole 112 of the gasket body 1, and quickly rushes into the cylinder chamber 26, so as to be sprayed from the scavenging port into the inner wall surface of the cylinder body 2 facing the exhaust port 21 as a scavenging airflow at a certain scavenging angle, and then folded back from here, so that the exhaust gas after combustion is discharged from the exhaust port 21.

[0044] like Figure 2 — Figure 3 , Figure 5 , Figure 8 As shown, the second preferred embodiment of the utility model:

[0045] A two-stroke gasoline engine cylinder gasket is sleeved on a cylinder flange surface 25. After a cylinder stop 24 is inserted into a connecting end of a crankcase 4, the cylinder 2 and the crankcase 4 are sealed and connected via fasteners.

[0046] The cylinder gasket is configured as a thin sheet gasket body 1, which is provided with a center hole 12 that matches and fits on the cylinder stop 24 and a multi-hole unit 11 that is symmetrically arranged on the left and right sides of the center hole 12. The two multi-hole units 11 are used to respectively connect the crankshaft chamber 41 with the right scavenging duct 22 and the left scavenging duct 23 of the cylinder cavity 26.

[0047] The multi-through-hole unit 11 is provided with three through holes, which are two large through holes 111 with an area of ​​A and one small through hole 112 with an area of ​​35%A to 40%A, and the large through hole 111 and the small through hole 112 are arranged at intervals. In this embodiment, the area of ​​the large through hole 111 is set to 20mm², and the area of ​​the small through hole 112 is set to 7mm². The specific setting of the area difference between the large through hole 111 and the small through hole 112, and the total area of ​​the three through holes accounts for 30% to 35% of the corresponding cross-section of the right scavenging passage 22 or the left scavenging passage 23, can ensure the formation of a canyon effect, so that the mixed gas expands rapidly after passing through the through holes and is evenly atomized. Because it is arranged on the cylinder gasket, the airflow mixing process passes through a longer scavenging passage, which can make the air and oil gas in the mixed gas collide and mix continuously, and are fully mixed before reaching the combustion chamber.

[0048] The small through hole 112 is located on the horizontal center line of the center hole 12, and the two large through holes 111 are asymmetrically arranged on both sides of the small through hole 112 in the longitudinal direction, with a spacing L2>L1; the two large through holes 111 corresponding to the right scavenging passage 22 are both inscribed in the right contour line 221 with a radius of R, and the two large through holes 111 corresponding to the left scavenging passage 23 are both inscribed in the left contour line 231 with a radius of R, such as Figure 5 shown.

[0049] By means of two asymmetrically arranged large through holes 111 which are inscribed in the right contour line 221 and the left contour line 231 respectively, three airflows with a fast speed in the middle and slow speeds on both sides can be formed in the scavenging duct, and the distances between the two slow airflows and the middle airflow are unequal, so that a canyon effect is formed while also forming partial vortices. In the process of quickly flowing through the scavenging duct with a longer path, the mixed gas continuously collides with the inner wall and is evenly atomized, thereby further improving the mixing uniformity of air and oil and gas in the mixed gas, and the mixed gas burns more fully after reaching the combustion chamber.

[0050] The minimum spacing S between the large through holes 111 and the small through holes 112 of the multi-through hole unit 11 and the edge of the gasket body 1 should be no less than 1 mm. In this embodiment, S=1 mm.

[0051] The thickness D of the gasket body 1 should be no less than 0.5 mm. In this embodiment, D=1 mm.

[0052] The outer dimensions of the gasket body 1 correspond to those of the cylinder flange surface 25, and four connecting holes 13 are provided on the periphery of the gasket body 1. The screws 5 are passed through the connecting holes of the cylinder 2, the connecting holes 13 of the gasket body 1, and the connecting holes of the crankcase 4 in sequence to tighten and seal the connection.

[0053] like Figure 3 , Figure 6 , Figure 8 As shown, the third preferred embodiment of the utility model:

[0054] A two-stroke gasoline engine cylinder gasket is sleeved on a cylinder flange surface 25. After a cylinder stop 24 is inserted into a connecting end of a crankcase 4, the cylinder 2 and the crankcase 4 are sealed and connected via fasteners.

[0055] The cylinder gasket is configured as a thin sheet gasket body 1, which is provided with a center hole 12 that matches and fits on the cylinder stop 24 and a multi-hole unit 11 that is symmetrically arranged on the left and right sides of the center hole 12. The two multi-hole units 11 are used to respectively connect the crankshaft chamber 41 with the right scavenging duct 22 and the left scavenging duct 23 of the cylinder cavity 26.

[0056] The multi-through-hole unit 11 is provided with three through holes, which are set as one large through hole 111 with an area of ​​A and two small through holes 112 with an area of ​​35%A to 40%A, and the small through holes 112 are arranged at intervals from the large through holes 111. In this embodiment, the area of ​​the large through hole 111 is set to 25mm², and the area of ​​the small through hole 112 is set to 10mm². The specific setting of the area difference between the large through hole 111 and the small through hole 112, and the total area of ​​the three through holes accounts for 30% to 35% of the corresponding cross-section of the right scavenging passage 22 or the left scavenging passage 23, can ensure the formation of a canyon effect, so that the mixed gas expands rapidly after passing through the through holes and is evenly atomized. Because it is arranged on the cylinder gasket, the airflow mixing process passes through a longer scavenging passage, which can make the air and oil gas in the mixed gas collide and mix continuously, and are fully mixed before reaching the combustion chamber.

[0057] The large through hole 111 is located on the horizontal center line of the center hole 12, and the two small through holes 112 are symmetrically arranged on both sides of the large through hole 111 in the longitudinal direction, and the spacing is H; the two small through holes 112 corresponding to the right scavenging passage 22 are both inscribed in the right contour line 221 with a radius of R, and the two small through holes 112 corresponding to the left scavenging passage 23 are both inscribed in the left contour line 231 with a radius of R, as shown in FIG. Figure 6 shown.

[0058] The small through holes 112 symmetrically arranged on both sides of the large through hole 111 are inscribed in the right contour line 221 and the left contour line 231 respectively, so that three airflows with different speeds can be formed in the scavenging duct, with a slow speed in the middle and fast speeds on both sides. The airflows of the two small through holes 112 flow along the scavenging duct with a fast flow rate, and collide with the inner wall rapidly and continuously. Because the path is long, the number of collision and mixing of the three airflows is increased, thereby further improving the mixing uniformity of air and oil and gas in the mixture, and the mixture burns more fully after reaching the combustion chamber.

[0059] The minimum spacing S between the large through holes 111 and the small through holes 112 of the multi-through hole unit 11 and the edge of the gasket body 1 should be no less than 1 mm. In this embodiment, S=1 mm.

[0060] The thickness D of the gasket body 1 should be no less than 0.5 mm. In this embodiment, D=1 mm.

[0061] The outer dimensions of the gasket body 1 correspond to those of the cylinder flange surface 25, and four connecting holes 13 are provided on the periphery of the gasket body 1. The screws 5 are passed through the connecting holes of the cylinder 2, the connecting holes 13 of the gasket body 1, and the connecting holes of the crankcase 4 in sequence to tighten and seal the connection.

[0062] like Figure 7 , Figure 8 As shown, the fourth preferred embodiment of the utility model:

[0063] A two-stroke gasoline engine cylinder gasket is sleeved on a cylinder flange surface 25. After a cylinder stop 24 is inserted into a connecting end of a crankcase 4, the cylinder 2 and the crankcase 4 are sealed and connected via fasteners.

[0064] The cylinder gasket is configured as a thin sheet gasket body 1, which is provided with a center hole 12 that matches and fits on the cylinder stop 24 and a multi-hole unit 11 that is symmetrically arranged on the left and right sides of the center hole 12. The two multi-hole units 11 are used to respectively connect the crankshaft chamber 41 with the right scavenging duct 22 and the left scavenging duct 23 of the cylinder cavity 26.

[0065] The multi-through-hole unit 11 is provided with three through holes, which are two large through holes 111 with an area of ​​A and one small through hole 112 with an area of ​​35%A to 40%A, and the small through hole 112 is arranged at intervals from the large through hole 111. In this embodiment, the area of ​​the large through hole 111 is set to 25mm², and the area of ​​the small through hole 112 is set to 10mm². The specific setting of the area difference between the large through hole 111 and the small through hole 112, and the total area of ​​the three through holes accounts for 30% to 35% of the corresponding cross-section of the right scavenging passage 22 or the left scavenging passage 23, can ensure the formation of a canyon effect, so that the mixed gas expands rapidly after passing through the through holes and is evenly atomized. Because it is arranged on the cylinder gasket, the airflow mixing process passes through a longer scavenging passage, which can make the air and oil gas in the mixed gas collide and mix continuously, and are fully mixed before reaching the combustion chamber.

[0066] The large through hole 111 is located on the horizontal center line of the center hole 12, and the two small through holes 112 are asymmetrically arranged on both sides of the large through hole 111 in the longitudinal direction, with a spacing L2>L1; the two small through holes 112 corresponding to the right scavenging passage 22 are both inscribed in the right contour line 221 with a radius of R, and the two small through holes 112 corresponding to the left scavenging passage 23 are both inscribed in the left contour line 231 with a radius of R, as shown in FIG. Figure 7 shown.

[0067] Through two asymmetrically arranged small through holes 112 which are inscribed in the right contour line 221 and the left contour line 231 respectively, three airflows with slow speed in the middle and fast speeds on both sides can be formed in the scavenging duct, and the distances between the two fast airflows and the slow airflow in the middle are unequal. The airflows of the two small through holes 112 flow rapidly along the scavenging duct and collide rapidly and continuously with the inner wall, forming a canyon effect while also forming partial vortices. In the process of rapidly flowing through the scavenging duct with a longer path, the number of collision and mixing of the three airflows is increased, thereby further improving the mixing uniformity of air and oil and gas in the mixture, and the atomization is also uniform, so that the mixture burns more fully after reaching the combustion chamber.

[0068] The minimum spacing S between the large through holes 111 and the small through holes 112 of the multi-through hole unit 11 and the edge of the gasket body 1 should be no less than 1 mm. In this embodiment, S=1 mm.

[0069] The thickness D of the gasket body 1 should be no less than 0.5 mm. In this embodiment, D=1 mm.

[0070] The outer dimensions of the gasket body 1 correspond to those of the cylinder flange surface 25, and four connecting holes 13 are provided on the periphery of the gasket body 1. The screws 5 are passed through the connecting holes of the cylinder 2, the connecting holes 13 of the gasket body 1, and the connecting holes of the crankcase 4 in sequence to tighten and seal the connection.

[0071] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A two-stroke gasoline engine cylinder gasket, which is mounted on the cylinder flange surface that is sealed with the crankcase. Features: It comprises a gasket body and a multi-through hole unit symmetrically arranged on the gasket body for connecting the right scavenging passage and the left scavenging passage with the crank chamber and the cylinder chamber respectively; wherein, The gasket body is provided with a center hole that matches the sleeve on the cylinder stop, and the two multi-hole units are symmetrically arranged with the center vertical plane as the center plane. The multi-hole unit is provided with three through holes, including at least a large through hole with an area of ​​A and small through holes with an area of ​​35%A to 40%A arranged in an interval. At least two of the through holes arranged in an interval are respectively inscribed in the corresponding right contour line of the right scavenging duct and the left contour line of the left scavenging duct, and all the through holes are located within the corresponding outer contour line of the scavenging duct, so that the total area of ​​the through holes accounts for 30% to 35% of the cross-section of the corresponding right scavenging duct or the left scavenging duct.

2. The two-stroke gasoline engine cylinder gasket according to claim 1, characterized in that: The multi-through-hole unit is provided with two large through holes and one small through hole, the small through hole is located on the horizontal center line of the center hole, and the two large through holes are arranged on the longitudinal center lines on both sides of the small through hole; the two large through holes corresponding to the right scavenging duct are both inscribed in the right contour line, and the two large through holes corresponding to the left scavenging duct are both inscribed in the left contour line.

3. The two-stroke gasoline engine cylinder gasket according to claim 2, characterized in that: The two large through holes are symmetrically arranged on the longitudinal center line on both sides of the small through hole.

4. The two-stroke gasoline engine cylinder block gasket according to claim 1, characterized in that: The multi-through-hole unit is provided with two small through holes and one large through hole, the large through hole is located on the horizontal center line of the center hole, and the two small through holes are arranged on both sides of the horizontal center line; the two small through holes corresponding to the right scavenging channel are both inscribed in the right contour line, and the two small through holes corresponding to the left scavenging channel are both inscribed in the left contour line.

5. The two-stroke gasoline engine cylinder gasket according to claim 4, characterized in that: The two small through holes are symmetrically arranged on both sides of the horizontal center line.

6. The two-stroke gasoline engine cylinder block gasket according to any one of claims 1 to 5, characterized in that: The minimum distance between the edge of any through hole of the multi-through hole unit and the edge of the gasket body should be no less than 1 mm.

7. The two-stroke gasoline engine cylinder gasket according to claim 6, characterized in that: The thickness of the gasket body should not be less than 0.5 mm.

8. The two-stroke gasoline engine cylinder block gasket according to claim 7, characterized in that: The outer dimensions of the gasket body correspond to the outer dimensions of the cylinder flange surface, and a plurality of connecting holes are arranged on the periphery of the gasket body, and fasteners fasten the crankcase and the cylinder body through the connecting holes.

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