Cooling structure for engine and engine

Abstract

The invention belongs to the technical field of engines, and particularly discloses a cooling structure for an engine and the engine, the cooling structure for the engine comprises a cooling fan cover, the cooling fan cover comprises a cover body used for covering the outer side of a cover body of a cylinder head cover, and a cooling air duct is formed between the cover body and the cover body; the cooling air duct comprises an air inlet duct, a first side air duct, an air outlet duct, a second side air duct and a top air duct, the air inlet duct, the first side air duct, the air outlet duct and the second side air duct surround the cover body in the circumferential direction and are sequentially communicated end to end, and the top air duct is arranged at the top of the cover body; throat parts with reduced sectional areas are arranged in the middles of the first side air duct and the second side air duct. By the adoption of the scheme, the problems that rising hot air in an engine forms a high-temperature air mass at the position of the cylinder head cover, cooling air needs to climb to the position of the cylinder head cover, the high-temperature air mass retained at the top of the cylinder head cover cannot be quickly and effectively blown to the silencer direction, and the heat dissipation efficiency is extremely prone to being affected can be solved.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically relating to a cooling structure for an engine and an engine. Background Technology

[0002] The core cooling principle of an air-cooled engine is that the airflow generated by the cooling fan driven by the crankshaft blows over the high-temperature components, carrying away the heat. The cooling airflow typically travels through the crankcase, dissipates onto the crankcase, passes through the cylinders located on the crankcase, and finally exits from the muffler after passing through the crankcase and cylinders. In order to guide the cooling airflow, a duct is designed on the outside of the engine. Through the air duct design inside the duct, the cooling airflow can flow according to the required cooling path.

[0003] In practical designs, the air deflector typically exposes the cylinder head cover located at the top of the cylinder. This is because the cylinder head cover is a frequently operated part for adjusting valve clearance, and exposing it makes routine maintenance easier. Furthermore, the cylinder head cover is located at the highest point of the engine. Besides being exhausted from the muffler with the cooling airflow, some of the hot air from the engine naturally rises and dissipates to the cylinder head cover, where it comes into contact with the outside air and cools down through natural airflow.

[0004] For equipment with high requirements for protection, noise, or appearance, it is necessary to cover the cylinder head cover with a shroud. However, if the cylinder head cover is covered with a shroud, the hot air rising from the engine will form a high-temperature air mass at the cylinder head cover. The cooling air has to climb up to reach the cylinder head cover, which means that the cooling air volume at the cylinder head cover will be less. It will not be able to quickly and effectively blow the high-temperature air mass trapped on the top of the cylinder head cover toward the muffler, which will easily affect the heat dissipation efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a cooling structure and engine for an engine, thereby solving the problem that rising hot air in the engine forms a high-temperature air mass at the cylinder head cover, and the cooling air has to climb up to reach the cylinder head cover, making it impossible to quickly and effectively blow the high-temperature air mass trapped on the top of the cylinder head cover toward the muffler, which easily affects the heat dissipation efficiency.

[0006] According to embodiments of the present invention, the present invention adopts the following technical solution:

[0007] A cooling structure for an engine includes a cooling shroud, which includes a cover body for covering the outside of a cylinder head cover. A cooling air duct is formed between the cover body and the cover body. The cooling air duct includes an air inlet duct, a first side air duct, an air outlet duct, a second side air duct, and a top air duct. The air inlet duct, the first side air duct, the air outlet duct, and the second side air duct wrap around the circumference of the cover body and are connected end to end in sequence. The top air duct is located at the top of the cover body. The first side air duct and the second side air duct both include a throat and an enlarged diameter portion provided on both sides of the throat. The cross-sectional area of ​​the throat is smaller than that of the enlarged diameter portion.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] Cooling air enters the cooling air duct from the air inlet, passes through the first side air duct, the second side air duct, and the top air duct, and is then discharged from the air outlet. By setting throats in the first and second side air ducts, according to the Bernoulli effect, the cooling air velocity increases at the throats, and a certain local negative pressure can be generated. This can actively capture and draw in the hot air rising from below the cylinder head cover, and the accelerated gas flow forcefully deflects the direction of the rising hot air, allowing it to merge into the cooling air and be carried into the air outlet for discharge.

[0010] This design significantly reduces the amount of hot air trapped in the cooling duct, allowing the hot air to be carried away and expelled by the cooling air, thus avoiding any impact on heat dissipation efficiency.

[0011] Furthermore, a snap-fit ​​groove is provided at the bottom of the cover along its circumference, and a sealing component is provided in the snap-fit ​​groove.

[0012] Furthermore, the sealing assembly includes a sealing gasket fixed within the snap-fit ​​groove, and an elastic element is connected between the sealing gasket and the bottom of the snap-fit ​​groove. When the elastic element is at its natural length, the sealing gasket is arc-shaped and the protruding portion faces the opening of the snap-fit ​​groove.

[0013] Furthermore, it also includes a cooling fan mounted on the crankshaft and an air guide shroud covering the cooling fan, crankcase, and cylinder, with the shroud and air guide shroud connected.

[0014] Furthermore, the air guide shroud is provided with a guide section for directing airflow upward into the cooling shroud.

[0015] Furthermore, the cover can be detachably connected to the air guide cover.

[0016] According to embodiments of the present invention, the present invention also employs the following technical solutions:

[0017] An engine, including the cylinder head cover structure, cylinders, crankcase, and cooling structures for the engine.

[0018] Furthermore, the cylinder head cover structure includes a cover body, a shroud body covering the outside of the cover body, and a connector connecting the shroud body and the cover body, the connector being located inside the top air duct.

[0019] Furthermore, the connector includes a connecting plate fixed between the cover and the shroud, the length of the connecting plate being along the direction from the air inlet to the air outlet, and the connecting plate being spindle-shaped.

[0020] Furthermore, the upper end of the connecting plate is fixed to the cover, while the lower end of the connecting plate is detachably connected to the cover.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By connecting the cover and the housing, they can be installed and removed simultaneously when maintenance is required, without having to remove the cover and then the housing. Even with the addition of the housing design, the number of tasks for staff does not increase, as they only need to install and remove the housing instead of the housing, making daily maintenance easier. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the engine according to an embodiment of the present invention.

[0024] Figure 2 This is a side view of the engine according to an embodiment of the present invention.

[0025] Figure 3 This is a top sectional view of the cylinder head cover structure according to an embodiment of the present invention.

[0026] Figure 4 This is a side sectional view of the cylinder head cover structure according to an embodiment of the present invention.

[0027] Figure 5 for Figure 4 Enlarged view of section A.

[0028] In the diagram: 1. Cooling fan; 2. Cooling shroud; 3. Air guide shroud; 4. Cover; 5. Cover; 6. Connecting plate; 7. Throat; 8. Expanded diameter section; 9. First side air duct; 10. Air inlet duct; 11. Air outlet duct; 12. Top air duct; 13. Screw; 14. Snap-fit ​​groove; 15. Sealing gasket; 16. Elastic element. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings, and specific embodiments are given.

[0030] In a first aspect, embodiments of the present invention disclose a cooling structure for an engine, specifically including the following embodiments:

[0031] like Figure 1 , Figure 3 , Figure 4As shown, the cooling structure for the engine includes a cooling shroud 2, which includes a cover 4 for covering the outside of the cover 5 of the cylinder head cover. A cooling air duct is formed between the cover 4 and the cover 5. Specifically, the cooling air duct includes an air inlet duct 10, a first side air duct 9, an air outlet duct 11, a second side air duct, and a top air duct 12. The air inlet duct 10, the first side air duct 9, the air outlet duct 11, and the second side air duct surround the cover 5 in a circumferential direction and are connected end to end in sequence. The top air duct 12 is located at the top of the cover 5.

[0032] Inside the cooling air duct, the cooling air follows the path of entering through the air inlet duct 10, passing through the first side air duct 9, the second side air duct, and the top air duct 12, before exiting through the air outlet duct 11.

[0033] The first side air duct 9 and the second side air duct have a throat 7 with a reduced cross-sectional area in the middle. Taking the first side air duct 9 as an example (the second side air duct has the same design), the first side air duct 9 includes the throat 7 and the expansion section 8 located on both sides of the throat 7. The cross-sectional area of ​​the throat 7 is smaller than that of the expansion section 8. The inner walls of the expansion section 8 and the throat 7 are smoothly transitioned. Specifically, the inner wall of the cover 4 is designed as an arc shape, thus forming the first side air duct 9. According to the Bernoulli effect, the cooling air velocity increases at the throat 7, and a certain local negative pressure can be generated. This can actively capture and draw in the hot air rising from below the cylinder head cover, and the increased gas velocity forcibly deflects the direction of the rising hot air, allowing it to merge into the cooling air and be carried into the outlet air duct 11 for discharge.

[0034] In another embodiment of the invention, the cooling structure for the engine further includes a cooling fan 1 mounted on the crankshaft and an air guide shroud 3 covering the cooling fan 1, crankcase, and cylinder. The crankcase and cylinder are conventional engine components, and the cylinder head cover structure is located on top of the cylinder. In actual design, the engine structure may also include a muffler, and the air guide shroud 3 may also include the muffler. The air guide shroud 3 can be a split design consisting of multiple connected pieces, or it can be a one-piece design that wraps around the outside of the engine structure. In this embodiment, the main function of the air guide shroud 3 is to guide the cooling air from the cooling fan 1 to the cover 5 of the crankcase, cylinder, and cylinder head cover, and then exhaust it from the direction of the muffler.

[0035] The cover 4 and the air guide cover 3 are connected, and the cover 4 is detachably connected to the air guide cover 3. Specifically, the bottom of the cover 4 is provided with a snap-fit ​​groove 14 along its circumference, and the air guide cover 3 is provided with a snap-fit ​​plate for inserting into the snap-fit ​​groove 14. The snap-fit ​​plate and the snap-fit ​​groove 14 are snap-fitted together to realize the positioning of the cover 4 and the air guide cover 3. Then, the cover 4 is connected to the air guide cover 3 by conventional bolt connection.

[0036] The air guide shroud 3 is provided with a guide section for directing airflow upward into the cooling shroud 2, combined with Figure 2As shown, in actual use, the cooling fan 1 rotates clockwise, and the cooling air forms a clockwise vortex around the cooling fan 1. The air guide shroud 3 is inclined above the cooling fan 1 to form a guide section, so that when the cooling air reaches this point, it enters the shroud 4 along the inclined surface.

[0037] In another embodiment of the present invention, when the cover 4 is assembled onto the air guide cover 3, in order to avoid noise problems caused by cooling air being discharged from the assembly joint, this embodiment combines... Figure 1 , Figure 4 , Figure 5 As shown, a sealing assembly is provided within the snap-fit ​​groove 14. The design of the snap-fit ​​groove 14 allows for positioning and assembly with the air guide shroud 3. The sealing assembly includes a sealing gasket 15 fixed within the snap-fit ​​groove 14. The sealing gasket 15 is made of a highly elastic rubber material. An elastic element 16 connects the sealing gasket 15 and the bottom of the snap-fit ​​groove 14. In this embodiment, the elastic element 16 is a flexible corrugated tube, which is elastic and has a large contact area with the sealing gasket 15, preventing springs or other components from making point contact with the sealing gasket 15 and damaging it.

[0038] When the elastic element 16 is at its natural length, the sealing gasket 15 is arc-shaped with its protruding portion facing the opening of the snap-fit ​​groove 14. When the snap-fit ​​plate is inserted into the snap-fit ​​groove 14, the snap-fit ​​plate abuts against the sealing gasket 15, causing the elastic element 16 to contract. After the sealing gasket 15 deforms, it fits tightly against the end of the snap-fit ​​plate. Then, the cover 4 and the air guide cover 3 can be bolted together. When the cover 4 is subsequently removed, after the bolts are released, the restoring force of the elastic element 16 can assist the cover 4 to pop up to a certain extent, making it easier to remove the cover 4.

[0039] Secondly, embodiments of the present invention disclose an engine, specifically including the following embodiments:

[0040] Combination Figure 1 , Figure 3 , Figure 4 As shown, the engine includes a cylinder head cover structure, cylinders, a crankcase, and a cooling structure for the engine as described in any of the preceding embodiments. The cylinder head cover structure includes a cover body 5, and a shroud 4 covers the outside of the cover body 5. A connector is provided between the shroud 4 and the cover body 5. By connecting the shroud 4 and the cover body 5 through the connector, the cover body 4 and the cover body 5 can be installed and removed simultaneously when installation and maintenance are required, thereby improving the efficiency of installation and removal.

[0041] The connector is located inside the top air duct 12. Specifically, the connector includes a connecting plate 6 fixed between the cover 4 and the cap 5. The length of the connecting plate 6 is along the direction from the air inlet duct 10 to the air outlet duct 11, and the connecting plate 6 is spindle-shaped (see...). Figure 3As shown in the top view of the connecting plate 6, the shape design of the connecting plate 6 guides the cooling air as it passes through the connecting plate 6, allowing it to pass through the connecting plate 6 more smoothly, while avoiding the connecting plate 6 affecting the passage of the cooling air in the top air duct 12.

[0042] In actual design, the connecting plate 6 can be fixedly connected to both the cover 4 and the lid 5, thus designing the cover 4 and lid 5 as an integral structure. Alternatively, it can be designed as separate units. In this embodiment, the upper end of the connecting plate 6 is fixed to the cover 4, while the lower end of the connecting plate 6 is detachably connected to the lid 5. Specifically, a screw 13 is threaded onto the lid 5, with both ends of the screw 13 extending through the lid 5. The lower end of the connecting plate 6 has a threaded hole for the screw 13 to be screwed into. By aligning the threaded hole with the screw 13 and then screwing the screw 13 into the threaded hole, the connection between the lid 5 and the connecting plate 6 is achieved, thus realizing the separate assembly of the cover 4 and the lid 5. Of course, in actual design, the connecting plate 6 and the cover 4 can also adopt other conventional detachable connection methods.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cooling structure for an engine, characterized in that, The device includes a cooling shroud, which is a cover body for covering the outside of the cylinder head cover. A cooling air duct is formed between the shroud and the cover body. The cooling air duct includes an air inlet duct, a first side air duct, an air outlet duct, a second side air duct, and a top air duct. The air inlet duct, the first side air duct, the air outlet duct, and the second side air duct surround the cover body circumferentially and are connected end to end in sequence. The top air duct is located at the top of the cover body. The first side air duct and the second side air duct both include a throat and an enlarged diameter portion on both sides of the throat. The cross-sectional area of ​​the throat is smaller than that of the enlarged diameter portion.

2. The cooling structure for an engine according to claim 1, characterized in that, The bottom of the cover has a snap-fit ​​groove along its circumference, and a sealing component is provided in the snap-fit ​​groove.

3. The cooling structure for an engine according to claim 2, characterized in that, The sealing assembly includes a sealing gasket fixed in the snap-fit ​​groove, and an elastic element is connected between the sealing gasket and the bottom of the snap-fit ​​groove. When the elastic element is at its natural length, the sealing gasket is arc-shaped and the protruding part faces the opening of the snap-fit ​​groove.

4. The cooling structure for an engine according to any one of claims 1-3, characterized in that, It also includes a cooling fan mounted on the crankshaft and a shroud covering the outside of the cooling fan, crankcase, and cylinder, with the shroud and shroud connected.

5. The cooling structure for an engine according to claim 4, characterized in that, The air guide shroud is provided with a guide section for directing airflow upwards into the cooling shroud.

6. The cooling structure for an engine according to claim 4, characterized in that, The cover is detachably connected to the air guide cover.

7. An engine, characterized in that, It includes a cylinder head cover structure, a cylinder, a crankcase, and a cooling structure for an engine as described in any one of claims 1-6.

8. The engine according to claim 7, characterized in that, The cylinder head cover structure includes a cover body, a shroud body covering the outside of the cover body, and a connector connecting the shroud body and the cover body, the connector being located inside the top air duct.

9. The engine according to claim 8, characterized in that, The connector includes a connecting plate fixed between the cover and the shroud. The length of the connecting plate is along the direction from the air inlet to the air outlet, and the connecting plate is spindle-shaped.

10. The engine according to claim 9, characterized in that, The upper end of the connecting plate is fixed to the cover, while the lower end of the connecting plate is detachably connected to the cover.

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