Two-stroke gasoline engine
By setting up energy storage ring grooves in the housing of a two-stroke gasoline engine to collect lean and rich mixtures and optimizing the scavenging passage design, the problems of high fuel consumption and unstable scavenging flow pressure in the existing technology are solved, thereby achieving reduced fuel consumption and cost control.
Patent Information
- Application Number
- CN202520533718.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-03-25
AI Technical Summary
Existing two-stroke gasoline engines have high fuel consumption and unstable scavenging air pressure, leading to increased manufacturing costs.
A first energy storage ring groove and a second energy storage ring groove are set in the housing of the gasoline engine to collect lean mixture and rich mixture respectively, and form independent channels for entering the cylinder through the separation of the ribs. 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 enters the cylinder first and contacts the exhaust gas, reducing the discharge of unburned fuel, and optimizing the pressure of the scavenging flow.
It reduces gasoline engine fuel consumption by about 10%, reduces the emission of unburned fuel, lowers production costs, and reduces costs by 8-10 yuan per unit by optimizing scavenging air pressure without the need for a digital igniter, while also improving service life.
Smart Images
Figure CN223724725U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of gasoline engine, concretely relates to a two-stroke gasoline engine. BACKGROUND
[0002] Two-stroke gasoline engine refers to the engine that piston reciprocates twice to complete a working cycle when the crankshaft rotates once. The working principle of the general two-stroke gasoline engine is as follows: when the piston goes up, the exhaust port and the scavenging passage are closed, the mixed gas in the cylinder is compressed, the intake port is opened when the piston goes up to a certain position, and fresh mixed gas enters the crankcase. When the piston goes up to a certain angle before the top dead center, the spark plug ignites, and the mixed gas in the combustion chamber is ignited and explodes (at this time, the piston has passed the top dead center). The expanded gas pushes the piston down, and when it reaches a certain position, the exhaust port is opened, and the burned exhaust gas begins to be discharged. When it goes down to a certain position, the scavenging passage starts to enter fresh mixed gas, and the exhaust gas is accelerated to be squeezed out of the cylinder. In this process, since there is an overlap time between scavenging and exhaust, a part of fresh gas (containing unburned fuel) will escape with the exhaust gas, which will also cause the oil consumption rate to rise. At the same time, due to the high temperature inside the muffler, the emissions such as NO x , HC, etc. will increase sharply; when the gasoline engine runs under various conditions, the pressure of the scavenging flow is unstable, which leads to large speed fluctuation. In order to solve this problem, the existing gasoline engine uses a digital igniter, which increases the cost, so that the manufacturing cost is high. UTILIZABLE INVENTION
[0003] In view of the above problems, the utility model aims to provide a two-stroke gasoline engine, which solves the problems of high oil consumption and unstable scavenging flow pressure in the prior art, and the problem of high manufacturing cost caused by the addition of a digital igniter.
[0004] To achieve the above-mentioned purpose, the utility model provides the technical scheme:
[0005] A two-stroke gasoline engine, comprising a box body, a crankshaft, a magneto and a 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 cylinder is arranged on the upper end of the box body and is communicated. 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 arranged in the box body, the two ends of the first energy storage ring groove and the second energy storage ring groove are isolated by a partition rib and are communicated with a first scavenging passage and a second scavenging passage arranged on the cylinder respectively, and the top angle of the first scavenging passage is larger than that of the second scavenging passage.
[0006] With the above structure design, the first energy storage ring groove and the second energy storage ring groove are arranged in the box body, the first energy storage ring groove is close to the center of the box body and converges the lean mixture, and the second energy storage ring groove is away from the center of the box body and is integrated with the inner wall of the box body and converges the rich mixture. The first energy storage ring groove and the second energy storage ring groove are communicated with the first scavenging passage and the second scavenging passage arranged on the cylinder respectively to realize that the lean mixture and the rich mixture enter the cylinder respectively, and the first energy storage ring groove and the second energy storage ring groove are isolated by the partition rib at both ends to form independent channels entering the cylinder. The top angle of the first scavenging passage is designed to be larger than the top angle of the second scavenging passage, so that the lean mixture in the first scavenging passage is higher after entering the cylinder, the lean mixture presses the rich mixture below, the lean mixture enters the cylinder first and contacts the exhaust gas, and the exhaust gas is discharged, so that the unburned fuel is reduced, and the fuel consumption of the gasoline engine is reduced.
[0007] In addition, through the design of the first energy storage ring groove and the second energy storage ring groove and the communication of the first scavenging passage and the second scavenging passage in the cylinder, the pressure of the scavenging flow can be increased, and the problem of unstable scavenging flow pressure of the gasoline engine on the market can be solved without increasing the digital igniter, thereby reducing the production cost of the gasoline engine.
[0008] As a further improvement, the top of the first scavenging passage and the second scavenging passage is composed of a plurality of curved surfaces, and the top angle of the first scavenging passage composed of curved surfaces is larger 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 structure design, the top of the first scavenging passage and the second scavenging passage is composed of a plurality of curved surfaces, and 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 enters the cylinder first and combines with the exhaust gas, and only the lean mixture is discharged when the exhaust gas is pushed out by the scavenging flow, thereby reducing fuel loss.
[0010] As a further improvement, the top of the second scavenging passage is provided with a buffer platform to slow down the entry of the rich mixture into the cylinder.
[0011] With the above structure design, the design of the buffer platform can further slow down the entry of the rich mixture into the cylinder, thereby ensuring that the lean mixture enters the cylinder first 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] Adopting the above structural design, the volume of the first energy storage ring groove is designed to be small, thereby reducing the discharged lean mixture and fuel loss, and further reducing the fuel consumption of the gasoline engine.
[0014] As a further improvement, the box body comprises a left box body and a right box body which are detachably connected, both ends of the crankshaft are rotatably arranged on the left box body and the right box body, and the first energy storage ring groove and the second energy storage ring groove are arranged on the left box body and the right box body.
[0015] As a further improvement, the connecting rod is arranged on the crankshaft, and the piston is arranged on the upper end of the connecting rod and in the cylinder, and the piston is driven to move up and down by the rotation of the crankshaft.
[0016] As a further improvement, the carburetor and the muffler are arranged on the two sides of the cylinder and communicate with the cylinder, the carburetor communicates with the oil tank arranged below the box body through a pipeline, and the lower end of the box body is fixedly connected with the oil tank.
[0017] As a further improvement, the two-stroke gasoline engine further comprises a protective cover, and the protective cover comprises a first protective area, a second protective area and a third protective area which are sleeved on the magneto, the cylinder and the muffler respectively, the upper end of the first protective area is formed as a sunken step, and the side edge of the first protective area is contracted to the middle to form a guide slope.
[0018] Adopting the above structural design, the protective cover plays a protective role on one hand, and on the other hand, the gas generated by the rotation of the magneto can be accurately and concentratedly introduced to the cooling blades of the cylinder through the above structural design, the heat generated by the cylinder is carried away by the airflow blowing through the blades, the cooling effect is obvious, and the service life of the gasoline engine is improved.
[0019] As a further improvement, the side of the second protective area away from the magneto and the side surface of the third protective area are arranged as a hollow structure, and the bottom of the third protective area separates the muffler and the oil tank by a heat insulation plate.
[0020] As a further improvement, a heat insulation rib is arranged between the second protective area and the third protective area.
[0021] Compared with the prior art, the utility model has the beneficial effects that:
[0022] 1. The utility model discloses a first energy storage ring groove and second energy storage ring groove are set up in the box inside for gathering rare mixed gas and thick mixed gas, and the first energy storage ring groove and second energy storage ring groove both ends are isolated by the spacer and form the passage of independent entering cylinder, and the top angle design of first scavenging passage is greater than the top angle of second scavenging passage, therefore, the rare mixed gas of entering from first scavenging passage is higher, and the rare mixed gas will press thick mixed gas below, and the rare mixed gas will enter cylinder and contact with the exhaust gas in cylinder, and when the exhaust gas is discharged, the rare mixed gas is discharged with exhaust gas, makes the unburnt fuel of discharging reduce, and then reduces the oil consumption of gasoline engine 10% or so.
[0023] 2. The utility model discloses the design of first energy storage ring groove and second energy storage ring groove can increase the pressure of scavenging flow, therefore, need not like the gasoline engine on market through increasing digital igniter to solve the problem of unstable scavenging flow pressure, and then reduces the production cost of gasoline engine.
[0024] 3. The utility model discloses the protection cover through the optimization on structure, can play the protection function on one hand, on the other hand, the gas of magnetoelectric machine rotation generates is accurately and concentratedly introduced to the cooling blade of cylinder, passes through the airflow and blows through the blade, carries away the heat generated by cylinder, can effectively reduce temperature 10~20 DEG C, improves the service life of gasoline engine. DRAWINGS
[0025] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, and are used to explain the utility model with the specific embodiment below, but do not constitute the limitation to the utility model. In the drawings:
[0026] Figure 1 It is the structural schematic diagram of the utility model;
[0027] Figure 2 It is Figure 1 The explosion diagram;
[0028] Figure 3 It is the internal schematic diagram of cylinder and box in the utility model;
[0029] Figure 4 It is the top schematic diagram of first scavenging passage and second scavenging passage in the cylinder of the utility model.
[0030] In the drawing:
[0031] Box 1, first energy storage ring groove 1a, second energy storage ring groove 1b, spacer 1c, left box 1d, right box 1e, crankshaft 2, connecting rod 2a, magneto 3, cylinder 4, first scavenging passage 4a, second scavenging passage 4b, buffer platform 4c, piston 5, carburetor 6, muffler 7, oil tank 8, protective cover 9, first protective area 9a, second protective area 9b, third protective area 9c, sunken step 9d, guide slope 9e, heat shield 9f. DETAILED DESCRIPTION
[0032] To make the technical content, structural features, purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.
[0033] The technical solutions of the present application will be described in detail below in combination with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.
[0034] Please refer to Figures 1 to 4 A two-stroke gasoline engine, comprising a box 1, a crankshaft 2, a magneto 3 and a cylinder 4, the crankshaft 2 is arranged in the box 1, and one end of the crankshaft 2 is connected with the magneto 3 on one side of the box 1. The crankshaft 2 is provided with a connecting rod 2a, and 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. The cylinders 4 are arranged at the upper end of the box 1 and are in communication with each other, the two sides of the cylinder 4 are respectively provided with a carburetor 6 and a muffler 7 in communication therewith, the carburetor 6 is in communication with an oil tank 8 arranged below the box 1 through a pipeline, and the lower end of the box 1 is fixedly connected with the oil tank 8.
[0035] Please refer to Figure 3 and Figure 4The first energy storage ring groove 1a is arranged near the center of the box 1, and the second energy storage ring groove 1b is arranged away from the center of the box 1 and is integrated with the inner wall of the box 1. Due to the high-speed rotation of the crankshaft 2, a strong centrifugal force is generated. Under the action of the centrifugal force, small droplets of gasoline will gather towards the inner wall of the box 1 and eventually adhere to the inner wall of the box 1. The mixed gas concentration in the interior of the box 1 will form a dilute mixed gas and a concentrated mixed gas partition. The concentrated mixed gas gathers near the wall of the box 1, that is, in the second energy storage ring groove 1b, and the dilute mixed gas gathers near the crankshaft 2, that is, in the first energy storage ring groove 1a. The two ends of the first energy storage ring groove 1a and the second energy storage ring groove 1b are isolated by the partition 1c and are respectively communicated with the first scavenging passage 4a and the second scavenging passage 4b arranged on the cylinder 4. This can make the channels for the dilute mixed gas and the concentrated mixed gas entering the cylinder 4 relatively independent, and can also ensure the pressure of the scavenging flow. Therefore, the situation that the digital igniter is increased due to the unstable pressure of the scavenging flow can be avoided, the analog igniter can be continued to be used, and the cost can be reduced by 8-10 yuan / piece.
[0036] Please continue to refer to Figure 4 In addition, the top included angle of the first scavenging passage 4a is greater than the top included angle of the second scavenging passage 4b. This design can make the dilute mixed gas in the first scavenging passage 4a have a higher height after entering the cylinder 4. The dilute mixed gas presses the concentrated mixed gas below, and the dilute mixed gas entering the cylinder 4 and the exhaust gas in the cylinder 4 are in contact first. 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 test of the prototype, 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 top of the first scavenging passage 4a and the second scavenging passage 4b is composed of a plurality of curved surfaces. The top included angle of the first scavenging passage 4a composed of curved surfaces is greater than the top included angle of the second scavenging passage 4b. The height of the dilute mixed gas in the first energy storage ring groove 1a entering the cylinder 4 is greater than that of the concentrated mixed gas in the second energy storage ring groove 1b, thereby making the dilute mixed gas contact the exhaust gas first. When the exhaust gas is discharged, the dilute mixed gas is discharged with the exhaust gas, thereby reducing the unburned fuel. In this embodiment, the volume of the first energy storage ring groove 1a is less than the volume of the second energy storage ring groove 1b. 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] Further, the top of the second scavenging passage 4b is provided with a buffer platform 4c for slowing down the concentrated mixed gas entering the cylinder 4. The speed of the concentrated mixed gas entering the cylinder 4 can be slowed down, and the concentrated mixed gas entering the cylinder 4 can be avoided from being discharged with the exhaust gas.
[0039] Please continue to refer toFigure 2 The box 1 comprises a left box 1d and a right box 1e which are detachably connected, two ends of the crankshaft 2 are rotatably arranged on the left box 1d and the right box 1e, and the left box 1d and the right box 1e are both provided with the first energy storage ring groove 1a and the second energy storage ring groove 1b.
[0040] Please refer to 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, an upper end of the first protective area 9a is formed as a sunken step 9d, and a side edge of the first protective area 9a is contracted to the middle to form a guide slope 9e. The second protective area 9b and the third protective area 9c are both provided as a hollow structure, the bottom of the third protective area 9c is separated from the oil tank 8 by a heat insulation plate 9f. Heat insulation ribs are arranged between the second protective area 9b and the third protective area 9c to separate the high-temperature area from other components.
[0041] The working principle of the utility model is as follows:
[0042] The first energy storage ring groove 1a arranged in the box 1 is close to the crankshaft 2, so that 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 box 1, and rich mixture is gathered in the second energy storage ring groove 1b. Meanwhile, the two ends of the first energy storage ring groove 1a and the second energy storage ring groove 1b are both provided with a partition rib 1c to form separate channels, and the first energy storage ring groove 1a and the second energy storage ring groove 1b are respectively communicated 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 larger than that 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, so that the lean mixture presses the rich mixture below, and preferentially contacts with 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 unburned fuel is reduced, and the fuel consumption of the gasoline engine is reduced.
[0043] According to the disclosure and teaching of the above description, the skilled in the art of the utility model can also change and modify the above embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model, and other devices with the same or similar functions are also within the protection scope of the utility model.
Claims
1. A two-stroke gasoline engine comprising a box (1), a crankshaft (2), a magneto (3) and a cylinder (4), said crankshaft (2) being arranged in the box (1) and one end of the crankshaft (2) being connected to the magneto (3) on one side of the box (1), said cylinder (4) being arranged at the upper end of the box (1) and being in communication, characterized in that, The box (1) is provided with a first energy storage ring groove (1a) near the center of the box (1), and a second energy storage ring groove (1b) away from the center of the box (1) and integrated with the inner wall of the box (1), the first energy storage ring groove (1a) and the second energy storage ring groove (1b) are isolated by the spacer (1c) at both ends and are respectively communicated with the first scavenging channel (4a) and the second scavenging channel (4b) provided on the cylinder (4), the top angle of the first scavenging channel (4a) is larger than the top angle of the second scavenging channel (4b). 2. A two-stroke gasoline engine as claimed in claim 1, characterized in that The top of the first scavenging channel (4a) and the second scavenging channel (4b) is composed of several curved surfaces.
3. A two-stroke gasoline engine according to claim 1 or 2, characterised in that The top of the second scavenging channel (4b) is provided with a buffer platform (4c).
4. A two-stroke gasoline engine as claimed in claim 1, characterized in that The volume of the first energy storage ring groove (1a) is smaller than the volume of the second energy storage ring groove (1b).
5. A two-stroke gasoline engine as claimed in claim 1, characterized in that The box (1) comprises a left box (1d) and a right box (1e) which are detachably connected, both ends of the crankshaft (2) are rotatably arranged on the left box (1d) and the right box (1e), and the left box (1d) and the right box (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) moves up and down by the rotation of the crankshaft (2).
7. A two-stroke gasoline engine as claimed in claim 1, characterized in that The cylinder (4) is provided with a carburetor (6) and a muffler (7) which are communicated with the cylinder (4) on both sides, the carburetor (6) is communicated with an oil tank (8) arranged below the box (1) through a pipeline, and the lower end of the box (1) is fixedly connected with the oil tank (8).
8. A two-stroke gasoline engine according to claim 7, characterised 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 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) is contracted to form a guide slope (9e).
9. A two-stroke gasoline engine according to claim 8, characterised in that The side away from the magneto (3) of the second protective area (9b) and the side of the third protective area (9c) are provided with a hollow structure, and the bottom of the third protective area (9c) separates the muffler (7) and the oil tank (8) by a heat insulation plate (9f).
10. A two-stroke gasoline engine according to claim 8, characterised in that Heat insulation ribs are arranged between the second protective area (9b) and the third protective area (9c).