A motorcycle engine air-cooling structure

Abstract

The utility model belongs to the technical field of motorcycle engine relates to a motorcycle engine's air -cooled structure, including engine, fan and fairing, one side of fairing is provided with the air inlet chamber connected with fan, the other side is provided with the air outlet chamber connected with engine, be provided with baffle and wind shield in the air inlet chamber, the baffle sets up along the gas flow direction, wind shield sets up along the direction of hindering gas flow, the baffle separates into upper air inlet chamber and lower air inlet chamber with the cross-sectional area of upper air inlet chamber being greater than the cross-sectional area of lower air inlet chamber, wind shield is located in upper air inlet chamber and makes the cross-sectional area of its place reduce. The utility model provides a motorcycle engine's air -cooled structure can guide the more cooling air to the area of the engine heat output and obtain better cooling effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of motorcycle engines and relates to an air-cooled structure for a motorcycle engine. Background Technology

[0002] Motorcycle engines typically use either air-cooling or water-cooling systems for cooling. While air-cooling systems have lower cooling capacity than water-cooling systems, they are simpler in structure and easier to maintain. Some small-displacement scooters still use air-cooling systems.

[0003] When a motorcycle engine is running, the heat generated is uneven across different areas. However, existing air-cooling systems direct the cooling air from the fan indiscriminately towards the engine, failing to effectively cool the engine's heat sources. Therefore, it is necessary to improve the airflow distribution system of the air-cooling system so that as much of the air generated by the fan as possible is directed to the heat-generating parts of the engine.

[0004] Chinese invention patent CN119435189A discloses an air-cooling system and an engine, including an engine block and a cooling system. The cooling system includes: a fan assembly, including a fan and a fan shroud with an air outlet I; an air guide shroud for forming a cooling air duct for cooling the engine block, the cooling air duct being connected to the air outlet I; and a flow guide, disposed within the cooling air duct, for forming a branch air duct for diverting and guiding the cooling air to the area near the intake side of the cylinder head spark plug I.

[0005] While the aforementioned engine's air-cooling system can direct the cooling air generated by the fan to a specific area, its cooling air duct design is exceptionally complex and requires the use of a fan shroud with a specific structure. Therefore, it is necessary to design a simpler guiding structure. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing an air-cooled structure for a motorcycle engine, which directs more cooling air to areas of the engine that generate a lot of heat, thereby achieving a better cooling effect.

[0007] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0008] A wind-cooled structure for a motorcycle engine includes an engine, a fan, and a fairing. One side of the fairing has an air inlet chamber connected to the fan, and the other side has an air outlet chamber connected to the engine. The air inlet chamber contains a guide vane and a baffle. The guide vane is positioned along the direction of gas flow, and the baffle is positioned along the direction that obstructs gas flow. The guide vane divides the air inlet chamber into an upper air inlet chamber and a lower air inlet chamber, with the upper air inlet chamber having a larger cross-sectional area than the lower air inlet chamber. The baffle is located within the upper air inlet chamber, reducing the cross-sectional area at its location.

[0009] In the aforementioned air-cooled structure of a motorcycle engine, the wind deflector is disposed on the side of the upper air intake chamber near the outlet, and the wind deflector extends downward from the top of the upper air intake chamber.

[0010] In the aforementioned air-cooled structure of a motorcycle engine, the guide plate is formed on the inner wall of the shroud corresponding to the air intake cavity, and the wind deflector is formed on the top of the inner wall of the shroud corresponding to the air intake cavity. The guide plate is distributed in the horizontal direction, and the wind deflector is distributed in the vertical direction. Preferably, the guide plate and the wind deflector are integrally formed with the shroud.

[0011] In the aforementioned air-cooled structure of a motorcycle engine, the axis of the fan is perpendicular to the axis of the air outlet of the shroud, and the inner wall of the air inlet cavity is configured as a guide slope connecting the fan and the air outlet of the shroud. Preferably, the air inlet cavity is a triangular cavity structure, the air outlet cavity is a rectangular cavity structure, and the upper air inlet cavity and the lower air inlet cavity are simultaneously connected to the air outlet cavity.

[0012] In the aforementioned air-cooled structure of a motorcycle engine, the front and rear ends of the guide vane are flush with the ends of the guide slope, and a gap is left between the front end of the baffle and the guide slope.

[0013] In the aforementioned air-cooled structure of a motorcycle engine, the guide vane is a right-angled triangular plate whose shape is adapted to the air intake cavity. That is, the shape and size of the guide vane are the same as the shape and size of the horizontal cross section corresponding to the air intake cavity. The hypotenuse of the guide vane is integrated with the guide slope. The baffle is a rectangular plate and is centrally located at the top of the air intake cavity outlet.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This invention provides an air-cooled structure for a motorcycle engine. First, a guide vane divides the air intake chamber into upper and lower sections, allowing more cooling air to enter the upper intake chamber. Then, a baffle plate increases the gas flow velocity in the upper intake chamber, resulting in a lower air pressure in the upper chamber compared to the lower chamber. Ultimately, this causes more cooling air to flow into the upper intake chamber. Through this guiding structure, the cooling air is primarily distributed to the upper region of the engine where heat generation is greater, thus achieving more effective cooling of the heat source. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is another perspective view of the present invention;

[0018] Figure 3 This is another perspective view of the present invention;

[0019] Reference numerals: 1. Fan; 2. Shield; 3. Air inlet cavity; 3a. Upper air inlet cavity; 3b. Lower air inlet cavity; 4. Air outlet cavity; 5. Draft vane; 6. Baffle; 7. Draft ramp. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0021] A wind-cooled structure for a motorcycle engine includes an engine, a fan 1, and a fairing 2. The fairing 2 has an air inlet chamber 3 connected to the fan 1 on one side and an air outlet chamber 4 connected to the engine on the other side. A guide plate 5 and a baffle plate 6 are disposed within the air inlet chamber 3. The guide plate 5 is positioned along the direction of gas flow, and the baffle plate 6 is positioned along the direction that obstructs gas flow. The guide plate 5 divides the air inlet chamber 3 into an upper air inlet chamber 3a and a lower air inlet chamber 3b, with the intercepting area of ​​the upper air inlet chamber 3a being larger than that of the lower air inlet chamber 3b. The baffle plate 6 is located within the upper air inlet chamber 3a, thereby reducing the intercepting area at its location.

[0022] The working method of this embodiment is as follows: Fan 1 is started, and the cooling air thrown out by Fan 1 enters the upper air intake chamber 3a and the lower air intake chamber 3b of the shroud 2 respectively. Since the cross-sectional area of ​​the upper air intake chamber 3a is larger than that of the lower air intake chamber 3b, most of the cooling air enters the upper air intake chamber 3a and a small portion enters the lower air intake chamber 3b. The cooling air in the upper air intake chamber 3a flows towards the air outlet chamber 4. When it passes through the baffle plate 6, the flow rate of the cooling air increases due to the reduction of the cross-sectional area. According to Bernoulli's principle, its air pressure drops, generating an air pressure difference. Under the action of the air pressure difference, more cooling air is drawn into the upper air intake chamber 3a and finally blown to the upper part of the engine through the upper part of the shroud 2, forming a directional cooling effect.

[0023] In this embodiment, the baffle plate 6 is disposed on the side of the upper air inlet cavity 3a near the outlet. The baffle plate 6 extends downward from the top of the upper air inlet cavity 3a. By disposing of the baffle plate 6 on the side of the upper air inlet cavity 3a near the outlet, the baffle plate 6 can be prevented from affecting the air intake, and the cooling air driven by the air pressure difference can flow more smoothly.

[0024] In this embodiment, the guide plate 5 is formed on the inner sidewall of the guide shroud 2 corresponding to the air inlet cavity 3, and the baffle plate 6 is formed on the top of the inner wall of the guide shroud 2 corresponding to the air inlet cavity 3. The guide plate 5 is distributed in the horizontal direction, and the baffle plate 6 is distributed in the vertical direction. Preferably, the guide plate 5 and the baffle plate 6 are integrally formed with the guide shroud 2.

[0025] The specific layout of each component in this embodiment is as follows: the axis of the fan 1 is perpendicular to the axis of the air outlet of the guide shroud 2, and the inner side wall of the air inlet cavity 3 is set as a guide slope 7 connecting the fan 1 and the air outlet of the guide shroud 2. Preferably, the air inlet cavity 3 has a triangular cavity structure, the air outlet cavity 4 has a rectangular cavity structure, and the upper air inlet cavity 3a and the lower air inlet cavity 3b are simultaneously connected to the air outlet cavity 4. The above layout can better adapt to the structure of the motorcycle and better guide the cooling air directly to the air outlet.

[0026] The front and rear ends of the aforementioned guide plate 5 are flush with the two ends of the guide slope 7. The guide plate 5 completely divides the air inlet cavity 3 into relatively independent upper air inlet cavity 3a and lower air inlet cavity 3b. A gap is left between the front end of the baffle plate 6 and the guide slope 7, and a portion of the cooling air can flow out along the guide slope 7 through the gap.

[0027] In this embodiment, the guide plate 5 is a right-angled triangular plate, and its shape is adapted to the air inlet cavity 3. That is, the shape and size of the guide plate 5 are the same as the shape and size of the horizontal cross section corresponding to the air inlet cavity 3. The hypotenuse of the guide plate 5 is integrated with the guide slope 7. The baffle plate 6 is a rectangular plate and is centrally located at the top of the air inlet cavity 3 outlet.

[0028] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A wind-cooled structure for a motorcycle engine, comprising an engine, a fan (1), and a fairing (2), wherein the fairing (2) has an air inlet chamber (3) connected to the fan (1) on one side and an air outlet chamber (4) connected to the engine on the other side, characterized in that, The air inlet cavity (3) is provided with a guide plate (5) and a baffle plate (6). The guide plate (5) is arranged along the direction of gas flow, and the baffle plate (6) is arranged along the direction that obstructs gas flow. The guide plate (5) divides the air inlet cavity (3) into an upper air inlet cavity (3a) and a lower air inlet cavity (3b), and the interception area of ​​the upper air inlet cavity (3a) is larger than that of the lower air inlet cavity (3b). The baffle plate (6) is located in the upper air inlet cavity (3a) and reduces the interception area at its location.

2. The air-cooled structure for a motorcycle engine according to claim 1, characterized in that, The baffle plate (6) is disposed on the side of the upper air inlet cavity (3a) near the outlet, and the baffle plate (6) extends downward from the top of the upper air inlet cavity (3a).

3. The air-cooled structure for a motorcycle engine according to claim 2, characterized in that, The guide plate (5) is formed on the inner side wall of the guide shroud (2) corresponding to the air inlet cavity (3), and the baffle plate (6) is formed on the top of the inner wall of the guide shroud (2) corresponding to the air inlet cavity (3). The guide plate (5) is distributed in the horizontal direction, and the baffle plate (6) is distributed in the vertical direction.

4. The air-cooled structure for a motorcycle engine according to claim 3, characterized in that, The axis of the fan (1) is perpendicular to the axis of the air outlet of the guide shroud (2), and the inner wall of the air inlet cavity (3) is configured as a guide slope (7) connecting the air outlet of the fan (1) and the guide shroud (2).

5. The air-cooled structure for a motorcycle engine according to claim 4, characterized in that, The front and rear ends of the guide plate (5) are flush with the two ends of the guide slope (7), and there is a gap between the front end of the wind baffle (6) and the guide slope (7).

6. The air-cooled structure for a motorcycle engine according to claim 4, characterized in that, The guide plate (5) is a right-angled triangular plate, and its shape is adapted to the air inlet cavity (3). The hypotenuse of the guide plate (5) is connected to the guide slope (7) as a whole. The baffle plate (6) is a rectangular plate and is centrally located at the top of the air inlet cavity (3) outlet.

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