Two-stroke gasoline engine

Abstract

The two-stroke gasoline engine comprises a box body, a crankshaft, a magneto and an air cylinder, the crankshaft is arranged in the box body, one end of the crankshaft is connected with the magneto on one side of the box body, and the air cylinder is arranged at the upper end of the box body and communicated with the box body. A first energy storage ring groove close to the center of the box body and a second energy storage ring groove away from the center of the box body and integrated with the inner wall of the box body are formed in the box body, and the two ends of the first energy storage ring groove and the two ends of the second energy storage ring groove are isolated through partition ribs and communicate with a first scavenging duct and a second scavenging duct arranged on the air cylinder correspondingly. The top included angle of the first scavenging duct is larger than that of the second scavenging duct. The first energy storage ring groove and the second energy storage ring groove are formed in the box body and used for collecting thin mixed gas and thick mixed gas, the thin mixed gas preferentially enters the air cylinder to make contact with waste gas, when the waste gas is exhausted, the thin mixed gas is exhausted along with the waste gas, exhausted unburned fuel is reduced, and then oil consumption of the gasoline engine is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gasoline engines, and in particular relates to a two-stroke gasoline engine. Background Art

[0002] A two-stroke gasoline engine is an engine in which the crankshaft rotates one circle and the piston reciprocates twice to complete a working cycle. The working principle of a general two-stroke gasoline engine is as follows: when the piston moves upward, the exhaust port and the scavenging passage are closed, and the mixed gas in the cylinder begins to be compressed. When the piston moves upward to a certain position, the air intake port opens, and fresh mixed gas enters the crankcase. When the piston rises to a certain angle before the top dead center, the spark plug ignites, ignites the mixed gas in the combustion chamber, and the mixed gas explodes and does work (at this time, the piston has passed the top dead center). The expanding gas pushes the piston downward, and when it reaches a certain position, the exhaust port opens, and the exhaust gas after combustion begins to be discharged. When it moves downward to a certain position, the fresh mixed gas begins to enter the scavenging passage, and the exhaust gas is accelerated out of the cylinder. In this process, since there is an overlap between scavenging and exhaust, a part of the fresh gas (containing unburned fuel) will escape with the exhaust gas, which will also lead to an increase in fuel consumption. At the same time, after entering the muffler, the high temperature inside the muffler will cause NO x , HC and other emissions increase dramatically; when the gasoline engine is operating in various working conditions, the speed fluctuates greatly due to the unstable pressure of the scavenging air flow. In order to solve this problem, the existing gasoline engine uses a digital igniter, which increases the cost a lot, so the manufacturing cost remains high. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a two-stroke gasoline engine, which solves the problems of high fuel consumption and unstable scavenging air flow pressure of the two-stroke gasoline engine in the prior art, and high manufacturing cost caused by adding a digital igniter.

[0004] To achieve the above purpose, the technical solution provided by the present invention is:

[0005] A two-stroke gasoline engine comprises a housing, a crankshaft, a magneto and a cylinder, wherein the crankshaft is arranged in the housing, and one end of the crankshaft is connected to the magneto on one side of the housing, and the cylinder is arranged at the upper end of the housing and is connected. The housing is provided with a first energy storage ring groove close to the center of the housing, and a second energy storage ring groove away from the center of the housing and integrated with the inner wall of the housing, wherein both ends of the first energy storage ring groove and the second energy storage ring groove are separated by partition ribs and are respectively connected to a first scavenging passage and a second scavenging passage arranged on the cylinder, and the top angle of the first scavenging passage is greater than the top angle of the second scavenging passage.

[0006] The above structural design is adopted, by setting the first energy storage ring groove and the second energy storage ring groove inside the box body, and the first energy storage ring groove is close to the center of the box body, which will gather the lean mixture, and the second energy storage ring groove is far away from the center of the box body and forms an integral body with the inner wall of the box body, which will gather the rich mixture. At the same time, the first energy storage ring groove and the second energy storage ring groove are respectively connected with the first scavenging passage and the second scavenging passage set on the cylinder to realize the lean mixture and the rich mixture entering the cylinder respectively, and the first energy storage ring groove and the second energy storage ring groove are separated by the partition rib at both ends to form an independent channel entering the cylinder, and at the same time, the top angle of the first scavenging passage is designed to be greater than the top angle of the second scavenging passage, so that the lean mixture in the first scavenging passage has a higher height after entering the cylinder, and the lean mixture presses the rich mixture below, and the lean mixture enters the cylinder first to contact with the exhaust gas in the cylinder, and when the exhaust gas is discharged, the lean mixture is discharged with the exhaust gas, so that the unburned fuel discharged is reduced, thereby reducing the fuel consumption of the gasoline engine.

[0007] In addition, through the design of the above-mentioned first energy storage ring groove and the second energy storage ring groove, and connecting the first scavenging passage and the second scavenging passage in the cylinder, the pressure of the scavenging flow can be increased. There is no need to add a digital igniter like gasoline engines on the market to solve the problem of unstable scavenging flow pressure, thereby reducing the production cost of the gasoline engine.

[0008] As a further improvement, the tops of the first scavenging passage and the second scavenging passage are composed of several curved surfaces, and the top angle of the first scavenging passage formed by the curved surfaces is greater than the top angle of the second scavenging passage, so that the height of the lean mixture in the first energy storage ring groove entering the cylinder is greater than that of the rich mixture in the second energy storage ring groove.

[0009] With the above-mentioned structural design, the tops of the first scavenging passage and the second scavenging passage are composed of several curved surfaces, which can increase the divergence of the mixture entering the cylinder within a certain range, and the intake efficiency is higher; at the same time, the height of the lean mixture in the first energy storage ring groove entering the cylinder is greater than that of the rich mixture in the second energy storage ring groove, so that the lean mixture can enter the cylinder first and combine with the exhaust gas. When the exhaust gas is squeezed out by the scavenging flow, only the lean mixture will be discharged, reducing fuel loss.

[0010] As a further improvement, a buffer platform is provided on the top of the second scavenging passage to slow down the rich mixed gas from entering the cylinder.

[0011] With the above structural design, the buffer platform can be designed to further slow down the progress of the rich mixture entering the cylinder, thereby ensuring that the lean mixture is first in contact with the exhaust gas and is discharged.

[0012] As a further improvement, the volume of the first energy storage ring groove is smaller than the volume of the second energy storage ring groove.

[0013] With the above structural design, the volume of the first energy storage ring groove is designed to be smaller, thereby reducing the discharged lean mixture, reducing fuel loss, and further reducing the fuel consumption of the gasoline engine.

[0014] As a further improvement, the case includes a left case and a right case that are detachably connected, both ends of the crankshaft are rotatably mounted on the left case and the right case, and the first energy storage ring groove and the second energy storage ring groove are provided on the left case and the right case.

[0015] As a further improvement, a connecting rod is provided on the crankshaft, and a piston is connected to the upper end of the connecting rod. The piston is arranged in the cylinder, and the piston is driven to move up and down by the rotation of the crankshaft.

[0016] As a further improvement, a carburetor and a muffler connected thereto are respectively provided on both sides of the cylinder, the carburetor is connected to an oil tank arranged below the box body through a pipeline, and the lower end of the box body is fixedly connected to the oil tank.

[0017] As a further improvement, the two-stroke gasoline engine also includes a protective cover, and the protective cover includes a first protective zone, a second protective zone and a third protective zone, which are respectively arranged outside the magneto, cylinder and muffler. The upper end of the first protective zone forms a sunken step, and the side edge of the first protective zone shrinks toward the middle to form a guide slope.

[0018] With the above structural design, the protective cover plays a protective role on the one hand, and on the other hand, the gas generated by the rotation of the magnetic motor can be accurately and concentratedly introduced into the cooling blades of the cylinder through the above structural design. The airflow blows through the blades to take away the heat generated by the cylinder, thereby achieving a significant cooling effect and prolonging the service life of the gasoline engine.

[0019] As a further improvement, the side of the second protection zone away from the magnetic motor and the side of the third protection zone are both set as hollow structures, and the bottom of the third protection zone separates the muffler from the oil tank through a heat insulation board.

[0020] As a further improvement, a heat insulation rib is provided between the second protection zone and the third protection zone.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The present invention arranges a first energy storage ring groove and a second energy storage ring groove inside the housing to collect lean mixed gas and rich mixed gas, and separates the first energy storage ring groove and the second energy storage ring groove at both ends by partition ribs to form independent channels entering the cylinder, and the top angle of the first scavenging passage is designed to be greater than the top angle of the second scavenging passage, so that the lean mixed gas entering from the first scavenging passage has a higher height, and the lean mixed gas presses the rich mixed gas below, and the lean mixed gas enters the cylinder first to contact with the exhaust gas in the cylinder, and when the exhaust gas is discharged, the lean mixed gas is discharged with the exhaust gas, so that the discharged unburned fuel is reduced, thereby reducing the fuel consumption of the gasoline engine by about 10%;

[0023] 2. The design of the first energy storage ring groove and the second energy storage ring groove in the present invention can increase the pressure of the scavenging flow. Therefore, there is no need to add a digital igniter to solve the problem of unstable scavenging flow pressure like gasoline engines on the market, thereby reducing the production cost of the gasoline engine;

[0024] 3. The protective cover designed in the present invention can play a protective role through structural optimization on the one hand, and on the other hand, it can accurately and centrally introduce the gas generated by the rotation of the magnetic motor to the cooling blades of the cylinder. The airflow blows through the blades to take away the heat generated by the cylinder, which can effectively reduce the temperature by 10 to 20°C and increase the service life of the gasoline engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 yes Figure 1 Exploded diagram of

[0028] Figure 3 It is the internal schematic diagram of the cylinder and the box body in the present invention;

[0029] Figure 4 It is a top schematic diagram of the first scavenging passage and the second scavenging passage inside the cylinder of the present invention.

[0030] In the figure:

[0031] Box body 1, first energy storage ring groove 1a, second energy storage ring groove 1b, partition rib 1c, left box body 1d, right box body 1e, crankshaft 2, connecting rod 2a, magnetic motor 3, cylinder 4, first scavenging duct 4a, second scavenging duct 4b, buffer platform 4c, piston 5, carburetor 6, muffler 7, fuel tank 8, protective cover 9, first protection area 9a, second protection area 9b, third protection area 9c, sunken step 9d, guide slope 9e, heat insulation board 9f. DETAILED DESCRIPTION

[0032] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] See also Figures 1 to 4 A two-stroke gasoline engine comprises a housing 1, a crankshaft 2, a magneto 3 and a cylinder 4. The crankshaft 2 is arranged in the housing 1, and one end of the crankshaft 2 is connected to the magneto 3 on one side of the housing 1. A connecting rod 2a is arranged on the crankshaft 2, and a piston 5 is connected to the upper end of the connecting rod 2a. The piston 5 is arranged in the cylinder 4, and the piston 5 is driven to move up and down by the rotation of the crankshaft 2. The cylinder 4 is arranged at the upper end of the housing 1 and is connected to each other. A carburetor 6 and a muffler 7 connected thereto are respectively arranged on both sides of the cylinder 4. The carburetor 6 is connected to an oil tank 8 arranged below the housing 1 through a pipeline, and the lower end of the housing 1 is fixedly connected to the oil tank 8.

[0035] See also Figure 3 and Figure 4, wherein the housing 1 is provided with a first energy storage annular groove 1a close to the center of the housing 1 and a second energy storage annular groove 1b away from the center of the housing 1 and integrated with the inner wall of the housing 1. Due to the strong centrifugal force generated by the high-speed rotation of the crankshaft 2, under the action of the centrifugal force, the small droplets of gasoline will gather toward the inner wall of the housing 1 and finally adhere to the inner wall of the housing 1. The concentration of the mixed gas inside the housing 1 will form a lean mixed gas and a rich mixed gas partition. The rich mixed gas will gather near the wall of the housing 1, that is, in the second energy storage annular groove 1b, and the lean mixed gas will gather near the crankshaft 2, that is, in the first energy storage annular groove 1a. The first energy storage annular groove 1a and the second energy storage annular groove 1b are separated at both ends by a partition rib 1c and are respectively connected to the first scavenging passage 4a and the second scavenging passage 4b ​​provided on the cylinder 4, so that the channels for the lean mixed gas and the rich mixed gas to enter the cylinder 4 are relatively independent, and the pressure of the scavenging gas flow can also be guaranteed. Therefore, the situation of adding a digital igniter due to unstable scavenging air flow pressure can be avoided, and the analog igniter can continue to be used, and the cost can be reduced by 8 to 10 yuan per piece.

[0036] Please continue reading Figure 4 In addition, the top angle of the first scavenging passage 4a is greater than the top angle of the second scavenging passage 4b. This design allows the lean mixture in the first scavenging passage 4a to enter the cylinder 4 at a higher height. The lean mixture presses the rich mixture below, and the lean mixture that preferentially enters the cylinder 4 first contacts the exhaust gas in the cylinder 4. When the exhaust gas is discharged, the unburned fuel discharged with the exhaust gas is reduced, thereby reducing the fuel consumption of the gasoline engine. According to the prototype test, the fuel consumption can be reduced by 10%, and the original exhaust can be reduced by 15%. At the same time, since the unburned fuel discharged with the exhaust gas in the cylinder 4 is reduced, the catalyst in the muffler can be reduced. According to the test, the catalyst in the muffler can be reduced from 30g to 24g, thereby further reducing the cost by 4 yuan / piece.

[0037] The tops of the first scavenging passage 4a and the second scavenging passage 4b ​​are composed of several curved surfaces, and the top angle of the first scavenging passage 4a composed of curved surfaces is greater than the top angle of the second scavenging passage 4b, so that the height of the lean mixture in the first energy storage ring groove 1a entering the cylinder 4 is greater than the rich mixture in the second energy storage ring groove 1b, thereby making the lean mixture contact with the exhaust gas first. When the exhaust gas is discharged, the lean mixture is discharged with the exhaust gas, thereby reducing unburned fuel. In this embodiment, the volume of the first energy storage ring groove 1a is smaller than the volume of the second energy storage ring groove 1b. Among them, the volume of the first energy storage ring groove 1a is 1.12mL, and the volume of the second energy storage ring groove 1b is 2.2mL.

[0038] Furthermore, a buffer platform 4c is provided at the top of the second scavenging passage 4b ​​to slow down the rich mixture entering the cylinder 4, thereby slowing down the speed at which the rich mixture enters the cylinder 4 and preventing the rich mixture from being discharged with the exhaust gas after entering the cylinder 4.

[0039] Please continue reading Figure 2 The housing 1 comprises a left housing 1d and a right housing 1e which are detachably connected, and both ends of the crankshaft 2 are rotatably mounted on the left housing 1d and the right housing 1e, and the first energy storage ring groove 1a and the second energy storage ring groove 1b are provided on the left housing 1d and the right housing 1e.

[0040] See also Figure 1 The two-stroke gasoline engine further comprises a protective cover 9, and the protective cover 9 comprises a first protective area 9a, a second protective area 9b and a third protective area 9c, which are respectively sleeved outside the magneto 3, the cylinder 4 and the muffler 7. The upper end of the first protective area 9a forms a sunken step 9d, and the side edge of the first protective area 9a shrinks toward the middle to form a guide slope 9e. The side of the second protective area 9b away from the magneto 3 and the side of the third protective area 9c are both set as hollow structures, and the bottom of the third protective area 9c is separated from the muffler 7 and the fuel tank 8 by a heat insulation board 9f. A heat insulation rib is set between the second protective area 9b and the third protective area 9c to isolate the high temperature area from other components.

[0041] The working principle of the present invention is as follows:

[0042] Since the first energy storage ring groove 1a opened in the housing 1 is close to the crankshaft 2, a lean mixture is gathered in the first energy storage ring groove 1a. The second energy storage ring groove 1b is integrated with the inner wall of the housing 1, and a rich mixture is gathered in the second energy storage ring groove 1b. At the same time, both ends of the first energy storage ring groove 1a and the second energy storage ring groove 1b are provided with partition ribs 1c to separate and form separate channels, and the first energy storage ring groove 1a and the second energy storage ring groove 1b are respectively connected with the first scavenging passage 4a and the second scavenging passage 4b ​​in the cylinder 4 to realize air intake. Since the top angle of the first scavenging passage 4a is greater than the top angle of the second scavenging passage 4b, the lean mixture entering from the first scavenging passage 4a has a higher height after entering the cylinder 4, and the lean mixture presses the rich mixture below, and preferentially contacts the exhaust gas in the cylinder 4. When the exhaust gas is discharged, the lean mixture is discharged with the exhaust gas, so that the discharged unburned fuel is reduced, thereby reducing the fuel consumption of the gasoline engine.

[0043] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention. Other devices that are the same or similar to the above are all within the protection scope of the present invention.

Claims

1. A two-stroke gasoline engine, comprising a housing (1), a crankshaft (2), a magnetic motor (3) and a cylinder (4), wherein the crankshaft (2) is arranged in the housing (1), and one end of the crankshaft (2) is connected to the magnetic motor (3) on one side of the housing (1), and the cylinder (4) is arranged at the upper end of the housing (1) and is connected to the magnetic motor (3), characterized in that: The box body (1) is provided with a first energy storage ring groove (1a) close to the center of the box body (1) and a second energy storage ring groove (1b) away from the center of the box body (1) and integrally formed with the inner wall of the box body (1); the first energy storage ring groove (1a) and the second energy storage ring groove (1b) are separated at both ends by a partition rib (1c) and are respectively connected to a first scavenging passage (4a) and a second scavenging passage (4b) provided on the cylinder (4); the top angle of the first scavenging passage (4a) is greater than the top angle of the second scavenging passage (4b).

2. A two-stroke gasoline engine as claimed in claim 1, characterized in that: The tops of the first scavenging passage (4a) and the second scavenging passage (4b) are formed by a plurality of curved surfaces.

3. A two-stroke gasoline engine as claimed in claim 1 or 2, characterized in that: A buffer platform (4c) is provided on the top of the second scavenging duct (4b).

4. A two-stroke gasoline engine as claimed in claim 1, characterized in that: The volume of the first energy storage annular groove (1a) is smaller than the volume of the second energy storage annular groove (1b).

5. A two-stroke gasoline engine as claimed in claim 1, characterized in that: The housing (1) comprises a left housing (1d) and a right housing (1e) which are detachably connected, the two ends of the crankshaft (2) are rotatably mounted on the left housing (1d) and the right housing (1e), and the left housing (1d) and the right housing (1e) are both provided with the first energy storage ring groove (1a) and the second energy storage ring groove (1b).

6. A two-stroke gasoline engine as claimed in claim 1, characterized in that: The crankshaft (2) is provided with a connecting rod (2a), the upper end of the connecting rod (2a) is connected with a piston (5), the piston (5) is arranged in the cylinder (4), and the piston (5) is driven to move up and down by the rotation of the crankshaft (2).

7. A two-stroke gasoline engine as claimed in claim 1, characterized in that: A carburetor (6) and a muffler (7) are respectively provided on both sides of the cylinder (4) and are in communication therewith; the carburetor (6) is in communication with an oil tank (8) provided below the housing (1) through a pipeline, and the lower end of the housing (1) is fixedly connected to the oil tank (8).

8. A two-stroke gasoline engine as claimed in claim 7, characterized in that: The two-stroke gasoline engine further comprises a protective cover (9), and the protective cover (9) comprises a first protective area (9a), a second protective area (9b) and a third protective area (9c), which are respectively sleeved outside the magnetic motor (3), the cylinder (4) and the muffler (7), the upper end of the first protective area (9a) forms a sunken step (9d), and the side edge of the first protective area (9a) shrinks toward the middle to form a guiding inclined surface (9e).

9. A two-stroke gasoline engine as claimed in claim 8, characterized in that: The side of the second protection zone (9b) away from the magnetic motor (3) and the side of the third protection zone (9c) are both arranged as hollow structures, and the bottom of the third protection zone (9c) is separated from the muffler (7) and the oil tank (8) by a heat insulation board (9f).

10. A two-stroke gasoline engine as claimed in claim 8, characterized in that: A heat insulation rib is provided between the second protection zone (9b) and the third protection zone (9c).

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