Cylinder head cover of two-stroke gasoline engine

Abstract

The utility model discloses a cylinder head cover of a two-stroke gasoline engine, which is arranged outside the gasoline engine. The cylinder head cover comprises a body, the front end of the body downwards forms a sinking step, the sinking step continues to extend to form a first shell, the side face of the first shell shrinks towards the middle to form a guide inclined face, one side of the body is connected with a second shell, the body is arranged outside a cylinder of the gasoline engine, and the first shell is arranged at the upper end of a magneto of the gasoline engine. The second shell is arranged on a silencer of the gasoline engine in a sleeving mode. According to the utility model, the volute structure design is adopted by the body and the first shell, the sinking step is arranged, and the side surface of the first shell is shrunk towards the middle to form the guide inclined surface, so that airflow pressure generated by high-speed rotation of a magnetor impeller can be guided into the most concentrated position of cooling blades on the air cylinder, and the airflow passes through the air cylinder blades more smoothly; and heat generated by the cylinder is taken away, so that the heat dissipation effect of the cylinder is improved.

Description

Technical Field

[0001] This utility model belongs to the field of gasoline engine technology, specifically relating to a cylinder head cover for a two-stroke gasoline engine. Background Technology

[0002] A two-stroke gasoline engine is an engine in which the piston completes one working cycle with one revolution of the crankshaft and two reciprocating strokes. The typical working principle of a two-stroke gasoline engine is as follows: When the piston moves upward, the exhaust port and scavenging passage are closed, and the air-fuel mixture in the cylinder begins to compress. When the piston reaches a certain position, the intake port opens, and fresh air-fuel mixture enters the crankcase. When the piston reaches a certain angle before top dead center, the spark plug ignites, igniting the air-fuel mixture in the combustion chamber. The mixture combusts and does power (at this point, the piston has passed top dead center). The expanding gas pushes the piston downward. At a certain position, the exhaust port opens, and the exhaust gases begin to escape. After moving further downward, fresh air-fuel mixture enters the scavenging passage, accelerating the exhaust gases out of the cylinder. At this point, the cylinder temperature rises, and the gasoline engine cools down by using a high-speed rotating impeller of a magneto to generate airflow that directs the airflow into the cylinder, reducing its temperature during operation. Existing gasoline engines, due to their high combustion concentration, incomplete combustion, and low compression ratio, operate at relatively low temperatures; existing cylinder head covers are sufficient to achieve this cooling effect. However, with the advancement of emission technology, gasoline engines have entered the era of low emissions. The cylinder temperature is relatively high. The cylinder head cover currently available on the market has poor heat dissipation, which makes it difficult to lower the cylinder temperature of low-emission gasoline engines, and cylinder scoring may occur at any time. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to provide a cylinder head cover for a two-stroke gasoline engine, which solves the problem that existing cylinder head covers have poor cooling effects on cylinder temperatures during the operation of low-emission gasoline engines.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A cylinder head cover for a two-stroke gasoline engine is disposed outside the gasoline engine. It includes a body, with a downward-sloping step at the front end of the body. The downward-sloping step extends to form a first housing, and the side of the first housing tapers towards the center to form a guide slope. A second housing is connected to one side of the body. The body is disposed outside the cylinder of the gasoline engine, and the first housing is disposed on the upper end of the magneto of the gasoline engine. The second housing is fitted onto the muffler of the gasoline engine.

[0006] By adopting the above structural design, through the volute structure design of the main body and the first housing, and setting a sinking step, and at the same time, the guide slope formed by the contraction of the side of the first housing towards the middle, the airflow generated by the high-speed rotation of the magneto impeller can be compressed and guided to the position where the cooling blades on the cylinder are most concentrated, so that the airflow passes through the cylinder blades more smoothly, takes away the heat generated by the cylinder, and thus improves the heat dissipation effect of the cylinder.

[0007] Preferably, the main body and the second housing are provided with heat dissipation grilles with a hollow structure.

[0008] By adopting the above structural design, while ensuring the strength of the cylinder head cover, the design of the heat dissipation grille can not only make the product lighter, but also improve the heat dissipation effect.

[0009] Preferably, the magneto is provided with a protective shell, and a fixing slot is provided at the lower end of the first shell where it meets the protective shell.

[0010] The above structural design can play a role in pre-positioning during cylinder head cover installation, thereby improving the installation efficiency of cylinder head cover.

[0011] Preferably, the internal connection between the main body and the second shell is provided with heat insulation ribs.

[0012] By adopting the above structural design, the high-temperature area of ​​the cylinder can be isolated from other components of the gasoline engine, which can reduce heat conduction and prevent it from affecting the temperature of other components.

[0013] Preferably, the inclination angle of the guide ramp is 15°-30°.

[0014] Preferably, the lower end of the second housing is detachably provided with a heat insulation plate to separate the muffler from the oil tank located below.

[0015] Preferably, the heat insulation plate is made of aluminum alloy, and the heat insulation plate is connected to the lower end of the second housing by a snap-fit ​​connection, and the surface of the heat insulation plate is coated with a high-temperature resistant coating.

[0016] The above structural design separates the muffler and fuel tank through a partition, reducing the risk of using gasoline engines.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model has a recessed step at the connection between the main body and the first housing. At the same time, the side of the first housing shrinks towards the middle to form a guide slope, which can reduce the airflow generated by the high-speed rotation of the magneto impeller and guide it to the position where the cooling blades on the cylinder are most concentrated. This allows the airflow to pass through the cylinder blades more smoothly, carrying away the heat generated by the cylinder, thereby improving the heat dissipation effect of the cylinder and effectively reducing the temperature by 10-20℃.

[0019] 2. The present invention has heat insulation ribs at the internal connection between the main body and the second housing, which can isolate the high-temperature area of ​​the cylinder position from other parts of the gasoline engine, reduce heat conduction and prevent it from affecting the temperature of other parts;

[0020] 3. The lower end of the second housing of this utility model is detachably equipped with a heat insulation plate to separate the muffler from the fuel tank located below, which can reduce the risk of using the gasoline engine. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the cylinder head cover of this utility model installed on a gasoline engine;

[0023] Figure 2 yes Figure 1 A structural diagram from another angle;

[0024] Figure 3 yes Figure 1 The exploded diagram in the middle;

[0025] Figure 4 This is a perspective view of the present invention.

[0026] In the picture:

[0027] 1. Main body, 2. Sinking step, 3. First shell, 3. Fixing slot, 31. Guide slope, 4. Second shell, 5. Heat dissipation grille, 6. Heat insulation rib, 7. Heat insulation plate, 8. Gasoline engine, 100. Cylinder, 110. Magneto, 120. Protective shell, 121. Muffler, 130. Fuel tank, 140. Box body, 150. Carburetor, 160. Detailed Implementation

[0028] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Please see Figures 1 to 4 A cylinder head cover for a two-stroke gasoline engine is provided, disposed outside a gasoline engine 100. The gasoline engine 100 includes a housing 150, a built-in crankshaft within the housing 150, one end of the crankshaft being connected to a magneto 120 disposed on one side of the housing 150, and a cylinder 110 connected to the upper end of the housing 150. The cylinder 110 contains a piston which moves up and down driven by the crankshaft below. A carburetor 160 and a muffler 130 are respectively disposed on both sides of the cylinder 110. The overall structure of the gasoline engine 100 and the connection methods of its components are existing technologies and will not be described in detail here. The cylinder head cover for the two-stroke gasoline engine includes a body 1, with a downward-sloping step 2 formed at the front end of the body 1. The downward-sloping step 2 continues to extend to form a first housing 3, and the side of the first housing 3 tapers towards the center to form a guide slope 4. In this embodiment, the inclination angle of the guide slope 4 is 15°-30°. The design of the recessed step 2 can suppress airflow, and together with the guide slope 4, it guides the airflow to the position where the cooling blades of the cylinder 110 are most concentrated, achieving the best heat dissipation effect. A second housing 5 is connected to one side of the main body 1. The main body 1 is set outside the cylinder 110 of the gasoline engine 100, and the first housing 3 is set on the upper end of the magneto 120 of the gasoline engine 100. The second housing 5 is sleeved on the muffler 130 of the gasoline engine 100.

[0031] The main body 1 and the second housing 5 are provided with a hollow heat dissipation grille 6. The heat dissipation grille 6 of the main body 1 is opened on the opposite side of the first housing 3, that is, at the air outlet, to facilitate heat dissipation.

[0032] The magneto 120 is provided with a protective shell 121. The lower end of the first shell 3 is provided with a fixing slot 31 at the joint with the protective shell 121. During installation, the lower end of the first shell 3 is snapped onto the protective shell 121, which can play a role in pre-installation and positioning, and can improve the installation efficiency of the cylinder head cover.

[0033] Furthermore, the internal connection between the main body 1 and the second housing 5 is provided with heat insulation ribs 7, which can isolate the high-temperature area of ​​the cylinder 110 from other areas and reduce heat conduction.

[0034] Furthermore, a heat insulation plate 8 is detachably provided at the lower end of the second housing 5 to separate the muffler 130 from the oil tank 140 located below, which can prevent heat from being conducted to the oil tank 140 and causing it to overheat.

[0035] In this embodiment, the heat insulation plate 8 is made of aluminum alloy, and the heat insulation plate 8 is connected to the lower end of the second housing 5 by a snap-fit ​​connection, and the surface of the heat insulation plate 8 is coated with a high-temperature resistant coating.

[0036] The working principle of this utility model is as follows:

[0037] This invention designs the lower end of the cylinder head cover as a recessed step 2, while the side of the first housing 3 tapers inward to form a guiding slope 4. Therefore, the airflow generated by the high-speed rotation of the magneto 120 impeller is compressed and directed to the location where the cooling blades on the cylinder 110 are most concentrated. The guiding slope 4 allows the airflow to pass more smoothly through the cylinder blades, carrying away the heat generated by the cylinder and thus improving the cylinder's heat dissipation effect. Prototype testing showed that when using existing ordinary cylinder head covers, the spark plug gasket temperature was generally above 250℃. However, when using the cylinder head cover of this application, the spark plug gasket temperature was measured between 230-240℃, demonstrating a significant cooling effect and extending the service life of the gasoline engine.

[0038] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. Other devices that are the same as or similar to these devices are all within the protection scope of this utility model.

Claims

1. A two-stroke gasoline engine cylinder head cover, arranged outside a gasoline engine (100), characterized in that The utility model relates to a gasoline engine magnetic motor protection device, including the body (1), the front end of body (1) forms the sunken step (2) downward, the sunken step (2) continues to extend and forms the first shell (3), and the first shell (3) side contracts to the middle and forms the guide slope (4), one side of the body (1) is connected with the second shell (5), the body (1) is arranged outside the cylinder (110) of gasoline engine (100), and the first shell (3) is arranged on the upper end of magneto (120) of gasoline engine (100), and the second shell (5) is sleeved on the muffler (130) of gasoline engine (100).

2. A two-stroke gasoline engine cylinder cover as claimed in claim 1, characterized in that The body (1) and the second shell (5) are provided with a heat dissipation grid (6) with a hollow structure.

3. A two-stroke gasoline engine cylinder cover as claimed in claim 1, characterized in that The magneto (120) is provided with a protective shell (121), and the lower end of the first shell (3) is provided with a fixed clamping groove (31) at the abutment with the protective shell (121).

4. A two-stroke gasoline engine cylinder cover as claimed in claim 1, characterized in that The body (1) and the second shell (5) are provided with a heat insulation rib (7) at the internal connection.

5. A two-stroke gasoline engine cylinder cover as claimed in claim 1, characterized in that The inclination angle of the guide slope (4) is 15°-30°.

6. A two-stroke gasoline engine cylinder cover as claimed in claim 1, characterized in that The lower end of the second shell (5) is detachably provided with a heat insulation plate (8) to separate the muffler (130) from the oil tank (140) arranged below.

7. A two-stroke gasoline engine cylinder cover as claimed in claim 6, characterized in that The heat insulation plate (8) is made of aluminum alloy, the lower end of the second shell (5) is connected with the heat insulation plate (8) by buckling, and the surface of the heat insulation plate (8) is coated with a high-temperature-resistant coating.

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