Air cooling system of engine and engine

Abstract

The invention discloses an air cooling system of an engine and the engine, the air cooling system comprises an engine body and a cooling system, the cooling system comprises a fan assembly, and the fan assembly comprises a fan and a fan cover provided with an air outlet I; the wind scooper is used for forming a cooling air duct for cooling the engine body, and the cooling air duct communicates with the air outlet I; the flow guide piece is arranged in the cooling air duct and used for forming a cooling air branch air duct to distribute and guide the cooling air to the area, close to the air inlet side, of the cylinder head spark plug I; according to the air cooling system of the engine and the engine, the air guide cover is connected with the fan cover, so that the cooling air channel for cooling the cylinder body and the cylinder head is formed, sufficient cooling of the cylinder body and the cylinder head can be achieved, meanwhile, the cooling effect on a spark plug can be improved by arranging the flow guide piece to guide cooling air to the spark plug area of the cylinder head, and the service life of the engine is prolonged. The utilization rate of cooling air is increased, heat dissipation of all parts of the engine is uniform, and therefore the requirements for dynamic property, economical efficiency and reliability of the engine are met.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an air cooling system of an engine and an engine. Background Art

[0002] Compared with water-cooled engines, the air cooling system of forced air-cooled engines is widely used in small-displacement scooters due to its simple structure and convenient maintenance. However, since the cooling capacity of forced air cooling is much lower than that of water cooling, if the forced air cooling system is not designed properly, high temperature will easily occur during engine operation, which will cause problems such as large engine deformation and reduced lubrication performance of engine oil, which will seriously affect the reliability of the engine. For small-displacement scooters, the air cooling structure in the prior art cannot simultaneously meet the development trend of motorcycle power improvement, low fuel consumption and dual spark plug technology, because the cylinder head spark plug, the cylinder head exhaust side and the cylinder body spark plug side are areas with large heat loads of the engine and need to be specifically dissipated. Therefore, the reasonable distribution of the cooling air thrown out by the fan is particularly critical. The air cooling structure in the prior art will cause the air volume distributed to the cylinder head to be too large and the cooling air to the cylinder body to be too small, resulting in insufficient cooling of the cylinder body. At the same time, for engines with dual spark plug structures, the spark plugs cannot be fully cooled.

[0003] Therefore, there is an urgent need to improve the air cooling structure of the engine in the prior art so that the cylinder block, cylinder head and spark plug areas of the engine can be fully cooled, thereby effectively increasing the cooling air volume and the utilization rate of the cooling air, and reasonably dissipating the air volume so that the heat of various engine components can be evenly dissipated to meet the engine's power, economy and reliability requirements. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an engine air cooling system and an engine, which can fully cool the cylinder block, cylinder head and spark plug area of ​​the engine, thereby effectively increasing the cooling air volume and the utilization rate of the cooling air, and reasonably dissipating the air volume, so that the heat of various engine components is evenly dissipated, thereby meeting the engine's power, economy and reliability requirements.

[0005] The air cooling system of the engine of the present invention comprises an engine body and a cooling system, wherein the cooling system comprises:

[0006] A fan assembly, comprising a fan and a fan cover provided with an air outlet I;

[0007] An air guide cover, used to form a cooling air duct for cooling the engine body, wherein the cooling air duct is connected to the air outlet I;

[0008] The guide member is arranged in the cooling air duct and is used to form a cooling air branch air duct to guide the cooling air branch to the cylinder head spark plug I near the intake side area.

[0009] Furthermore, the fan assembly also includes a fan upper cover, and the fan cover is provided with a plurality of annular protrusions I, and the plurality of annular protrusions I form a maze structure with the fan upper cover in the axial direction.

[0010] Furthermore, the air deflector is connected to the fan cover, and includes an air deflector I and an air deflector II. Most of the air deflector I is located on the intake side of the engine and forms a cooling air duct I for cooling the cylinder head and a cooling air duct II for cooling the cylinder body. Most of the air deflector II is located on the exhaust side of the engine and forms cooling air ducts III and IV for cooling the cylinder head and cooling air ducts V and VI for cooling the cylinder body.

[0011] Further, the air guide cover II is provided with a guide air duct for diverting the cooling air of the cooling air duct IV to the exhaust side of the cylinder head to cool the heat sink on the exhaust side of the cylinder head. The starting point I of the guide air duct is located near the connection between the cylinder block and the crankcase and extends in a direction close to the cylinder head to the end position of the heat sink on the exhaust side of the cylinder head and is located between the second heat sink and the fourth heat sink of the cylinder head.

[0012] An inclined portion is formed on the outer surface of the air guide cover, and the inclined portion is inclined forward and inward, and a downward pressure surface is formed at the end thereof, and the downward pressure surface is located between the third heat sink of the cylinder head and the fourth heat sink of the cylinder head.

[0013] Further, the air guide cover II is provided with a cylinder guide surface and a cylinder head guide surface, the cooling air flow of the cooling air duct IV is guided to the exhaust side of the cylinder head through the right side of the cylinder body through the cylinder head guide surface, the cooling air flow of the cooling air duct V is guided to the exhaust side heat sink of the cylinder body through the right side of the cylinder body through the cylinder guide surface, and the cooling air flow of the cooling air duct VI is guided to the heat sink of the cylinder body close to the crankcase through the right side of the cylinder body through the cylinder guide surface;

[0014] A guide step is formed between the cylinder body guide surface and the cylinder head guide surface, the guide step is located at the joint surface of the cylinder head and the cylinder body, and the guide step is used to guide the cooling air to the cylinder body;

[0015] The height of the guide step is 5 to 15 mm.

[0016] Further, the guide member is a guide plate, which is arranged inside the guide cover II and located above the side of the cylinder head spark plug I close to the cylinder head intake side, and is used to divert the cooling air of the cooling air duct III to the cylinder head spark plug I area;

[0017] The bottom edge of the guide plate is lower than the height of the first cooling fin of the cylinder head and not lower than the height of the spark plug I of the cylinder head, and the right edge of the guide plate is located between the first cooling fin of the cylinder head and the third cooling fin of the cylinder head.

[0018] Furthermore, the cylinder head is provided with a cylinder head middle air duct, and the cooling air of the cooling air duct III enters the cylinder head middle air duct from both sides of the cylinder head spark plug I after being guided by the guide plate;

[0019] At least two guide ribs arranged at intervals are arranged in the middle air duct of the cylinder head, which are used to guide the cooling air in the middle air duct of the cylinder head to the spark plug II of the cylinder head.

[0020] Further, the deflector cover II is provided with an opening, the opening is provided with a deflector structure I, and the opening is provided on one side of the deflector cover II located on the exhaust side of the cylinder body and near the connection between the deflector cover II and the crankcase;

[0021] The air outlet II of the air guide cover is located at the exhaust side of the engine, and the air outlet II is provided with a guide structure II for guiding the cooling air to the exhaust pipe.

[0022] Furthermore, there are two annular protrusions I, and the annular protrusions I include ribs I and ribs II extending inward and arranged at intervals;

[0023] The fan cover is provided with an air inlet, and the inner wall surface of the air inlet is located between the inner wall surface of the fan upper cover and the rib II.

[0024] An engine of the present invention comprises the air cooling system of the engine.

[0025] The beneficial effects of the present invention: the air cooling system and the engine of the engine of the present invention are provided with an air guide cover connected to the fan cover, thereby forming a cooling air duct for cooling the cylinder block and the cylinder head, which can achieve sufficient cooling of the cylinder block and the cylinder head. At the same time, by providing a guide member, the cooling air is diverted and guided to the spark plug area of ​​the cylinder head, which can improve the cooling effect on the spark plug, improve the utilization rate of the cooling air, and make the heat dissipation of various engine components uniform, thereby meeting the requirements of engine power, economy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] Figure 1 It is the front view of the engine;

[0028] Figure 2 It is a structural schematic diagram when the air guide cover and the fan assembly are connected;

[0029] Figure 3 It is a schematic diagram of the airflow path on the intake side of the engine;

[0030] Figure 4 is a schematic diagram of the airflow path on the exhaust side of the engine;

[0031] Figure 5Schematic diagram of the airflow path of the middle air duct of the cylinder head;

[0032] Figure 6 Schematic diagram of the air flow path of cooling air duct III;

[0033] Figure 7 It is a top view of the engine;

[0034] Figure 8 This is a bottom view of the engine;

[0035] Fig. 9 is a schematic diagram of the structure of a fan assembly;

[0036] Fig.10 for Fig. 9 Sectional view along AA direction;

[0037] Fig.11 for Figure 1 Structural diagram with some components hidden;

[0038] Fig.12 is the location diagram of the diversion step;

[0039] Fig.13 A schematic diagram of the structure of the air guide cover from one perspective;

[0040] Fig.14 for Figure 4 A schematic diagram of the structure from another perspective;

[0041] Fig.15 It is a schematic diagram of the airflow path on the engine chain case side;

[0042] Fig.16 (a) is a wind speed distribution diagram of the engine surface when the cooling system is running in the prior art;

[0043] Fig.16 (b) is a wind speed distribution diagram of the engine surface when the cooling system of the present invention is running;

[0044] Fig.17 (a) is a wind speed distribution diagram of the middle air duct of the cylinder head when the cooling system is running in the prior art;

[0045] Fig.17 (b) is a wind speed distribution diagram of the middle air duct of the cylinder head when the cooling system of the present invention is running;

[0046] The above drawings contain the following reference numerals:

[0047] 1. Fan; 101. Annular protrusion II; 102. Fan cover; 1021. Inner wall of fan cover; 2. Fan cover; 201. Inner wall of air inlet; 202. Annular protrusion I; 203. Air inlet; 204. Air outlet I; 3. Air guide cover I; 4. Air guide cover II; 401. Air guide duct; 4011. Starting point I; 4012. Landing point; 402. Air guide structure I; 403. Air guide step; 404. Air guide surface of cylinder head; 405. Air guide surface of cylinder body; 406. Air guide structure II; 407. Lower pressure surface; 408. Air outlet II; 409. Opening; 410. Joint surface ;411, guide step;5, guide plate;501, right edge;502, bottom edge;6, cylinder head spark plug Ⅰ;7, guide rib;8, cylinder head spark plug Ⅱ;9, cylinder head first heat sink;10, cylinder head third heat sink;11, cooling air duct Ⅱ;12, cooling air duct Ⅰ;13, cooling air duct Ⅲ;14, cooling air duct Ⅳ;15, cooling air duct Ⅴ;16, cooling air duct Ⅵ;17, cylinder head fourth heat sink;18, cylinder head second heat sink;19, exhaust pipe;20, crankcase;21, cylinder head;2101, exhaust hole Ⅱ;2102, exhaust hole Ⅰ;22, cylinder body. DETAILED DESCRIPTION

[0048] Figure 1 It is a structural schematic diagram of the present invention, Figure 2 This is a schematic diagram of the structure when the air guide cover and the fan assembly are connected. Figure 3 This is a schematic diagram of the airflow path on the engine intake side. Figure 4 Schematic diagram of the airflow path on the exhaust side of the engine. Figure 5 The schematic diagram of the airflow path of the middle air duct of the cylinder head is shown in Figure 1. Figure 6 Figure 3 is a schematic diagram of the air flow path of cooling air duct III. Figure 7 This is a top view of the engine. Figure 8 This is a bottom view of the engine. Fig. 9 is a schematic diagram of the structure of the fan assembly. Fig.10 for Fig. 9 Sectional view along AA direction, Fig.11 for Figure 1 A structural diagram that hides some components. Fig.12 is the location diagram of the diversion step, Fig.13 This is a structural diagram of the air guide cover from one perspective. Fig.14 for Figure 4 Another structural diagram from another perspective. Fig.15 This is a schematic diagram of the airflow path on the engine chain case side. Fig.16 (a) is the wind speed distribution diagram of the engine surface when the cooling system is running in the prior art, Fig.16 (b) is a wind speed distribution diagram of the engine surface when the cooling system of the present invention is running, Fig.17(a) is the wind speed distribution diagram of the middle air duct of the cylinder head when the cooling system is running in the prior art, Fig.17 (b) is a wind speed distribution diagram of the cylinder head middle air duct when the cooling system of the present invention is running, as shown in the figure: The air cooling system of the engine of this embodiment includes an engine body and a cooling system, and the cooling system includes:

[0049] The fan assembly includes a fan 1 and a fan cover 2 provided with an air outlet Ⅰ; the fan 1 is used to extract external air to convert it into cooling air to cool down the high heat load components of the engine, the fan 1 is arranged in the fan cover 2, and the fan cover 2 is provided with an air inlet 203 and an air outlet Ⅰ 204;

[0050] An air guide cover is used to form a cooling air duct for cooling the engine body, and the cooling air duct is connected to the air outlet Ⅰ204; the air guide cover is arranged on the engine body, and is used to form a cooling air duct for cooling the engine body, and the cooling air duct is connected to the air outlet Ⅰ204, so that the cooling air generated by the fan 1 can be guided to the high heat load components of the engine, and the air guide cover can be connected to the fan cover 2 or not fixedly connected to the fan cover 2, preferably fixedly connected to the fan cover 2, and the connection method can be fixed by bolt connection, etc., so that the structure can be compact;

[0051] The guide member is arranged in the cooling air duct, and is used to form a cooling air branch duct to guide the cooling air to the cylinder head spark plug Ⅰ6 near the intake side area; multiple air flow paths can be formed in the cooling air duct, so that different parts of the engine can be dissipated in a targeted manner. The guide member can be a guide plate 5 and other structures. The guide member is arranged in the cooling air duct to form a cooling air branch duct in the cooling air duct, that is, to form an air flow bypass in the cooling air duct, which is convenient for guiding the cooling air in the cooling air duct to the cylinder head spark plug Ⅰ6 near the intake side area, the intake side is above relative to the up and down direction of the motorcycle, so that the cylinder head spark plug Ⅰ6 area can be directly cooled, thereby improving the utilization rate of the cooling air.

[0052] In the prior art, the cylinder head spark plugs, the cylinder head exhaust side and the cylinder body spark plug side are areas with relatively large heat loads on the engine, and targeted heat dissipation is required. Therefore, the reasonable distribution of the cooling air thrown out by the fan is particularly critical. The air cooling structure in the prior art will cause the cylinder head to distribute a larger amount of air, and the cylinder body to have less cooling air, which will cause insufficient cooling of the cylinder body. At the same time, for an engine with a dual spark plug structure, the spark plugs cannot be fully cooled. The air cooling system and engine of the engine of the present invention are provided with an air guide cover connected to the fan cover 2, so as to form a cooling air duct for cooling the cylinder body and the cylinder head, which can achieve sufficient cooling of the cylinder body and the cylinder head. At the same time, by providing a guide member, the cooling air is guided to the cylinder head spark plug area, which can improve the cooling effect on the spark plug, improve the utilization rate of the cooling air, and make the heat dissipation of various engine components uniform, thereby meeting the requirements of engine power, economy and reliability.

[0053] In this embodiment, the fan assembly also includes a fan cover 102, and the fan cover 2 is provided with a plurality of annular protrusions Ⅰ202, and the plurality of annular protrusions Ⅰ202 form a maze structure with the fan cover 102 in the axial direction; the fan cover 102 is an end of the fan 1 close to the outside of the motorcycle (or the end close to the right side relative to the left and right direction of the motorcycle), the fan 1 also includes blades, and the fan cover 2 is covered on the outside of the fan 1. The specific structure of the fan 1 is the prior art and is not repeated here. The annular protrusion Ⅰ202 can be annular ribs, and the plurality of them can be one or two, etc. The annular protrusion Ⅰ202 is formed toward the left side (or the inside) relative to the left and right direction of the motorcycle, and the annular protrusion Ⅰ202 and the fan cover 102 form a maze structure in the axial direction (that is, a maze structure is formed with the right side surface of the fan cover 102, and the axial direction is relative to the left and right direction of the motorcycle), thereby avoiding cooling air backflow, increasing the cooling air volume, and reducing the noise generated when the fan 1 is running.

[0054] In this embodiment, the air guide cover is connected to the fan cover 2, including the air guide cover I3 and the air guide cover II4. The air guide cover I3 is mostly located on the intake side of the engine and forms a cooling air duct I12 for cooling the cylinder head 21 and a cooling air duct II11 for cooling the cylinder body 22. The air guide cover II4 is mostly located on the exhaust side of the engine and forms a cooling air duct III13 and a cooling air duct IV14 for cooling the cylinder head 21 and a cooling air duct V15 and a cooling air duct VI16 for cooling the cylinder body 22. The fan cover 2 is arranged at On the right side of the engine (relative to the left and right direction of the motorcycle), the deflector Ⅰ3 is mostly located on the intake side of the engine (i.e., the upper side relative to the up and down direction of the motorcycle), and the deflector Ⅱ4 is mostly located on the exhaust side of the engine (i.e., the lower side relative to the up and down direction of the motorcycle). The deflector Ⅰ3 and the deflector Ⅱ4 are set on the engine body (i.e., forming a box-like structure), mostly covering the upper side, the lower side and the right side of the engine. The cooling air enters from the air inlet 203 of the fan cover 2, and the deflector of the volute of the fan cover 2 is The cooling air of the cooling air duct I 12 and the cooling air duct II 11 flows from the right side of the engine through the intake side of the engine and the left side of the engine (or the chain box side) in turn, and finally flows to the exhaust side of the engine and is discharged through the air outlet of the air duct. The cooling air of the cooling air duct I 12 mainly flows through the cylinder head 21, and the cooling air of the cooling air duct II 11 mainly flows through the cylinder body 22, thereby reasonably diverting the cooling air and improving the cooling effect on the cylinder body 22 and the cylinder head 21. The cooling air from cooling air duct III13 and cooling air duct IV14 flows from the right side of the engine to the exhaust side of the engine and is discharged through the air outlet of the air guide cover. The cooling air from cooling air duct III13 and cooling air duct IV14 mainly cools the cylinder head 21. The cooling air from cooling air duct V15 and cooling air duct VI16 flows from the right side of the engine to the exhaust side of the engine and is discharged through the air outlet of the air guide cover. The cooling air from cooling air duct V15 and cooling air duct VI16 mainly cools the cylinder body 22, thereby improving the cooling effect on the right side of the cylinder body.

[0055] In this embodiment, the air deflector II4 is provided with a guide air duct 401, which is used to guide the cooling air of the cooling air duct IV14 to the exhaust side of the cylinder head to cool the heat sink on the exhaust side of the cylinder head. The starting point I4011 of the guide air duct 401 is located near the connection between the cylinder block 22 and the crankcase 20 and extends in the direction close to the cylinder head 21 to the end position of the heat sink on the exhaust side of the cylinder head and is located between the second heat sink 18 of the cylinder head and the fourth heat sink 17 of the cylinder head. By providing the guide air duct 401, the cooling air of the cooling air duct IV14 can be guided to the exhaust side of the cylinder head (the lower side relative to the up and down direction of the motorcycle). The exhaust side of the cylinder head is the side of the cylinder head 21 located at the lower part of the motorcycle, thereby improving the cooling effect of the heat sink on the exhaust side of the cylinder head. The starting point I4011 of the guide air duct 401 is located near the connection between the cylinder block 22 and the crankcase 20, and is also located in the middle of the cylinder block 22 (relative to the Fig.11 The middle part in the vertical direction of the guide air duct 401, the landing point 4012 is located at the end position of the heat sink on the exhaust side of the cylinder head (relative to Fig.11 The end of the heat sink in the up-down direction of the cylinder head) is located between the fourth heat sink 17 of the cylinder head and the second heat sink 18 of the cylinder head (the second and fourth are arranged from back to front relative to the front-back direction of the motorcycle), which can effectively cool the heat sink on the exhaust side of the cylinder head;

[0056] An inclined portion is formed on the outer surface of the air guide cover, which is inclined forward and inward and has a downward pressure surface 407 formed at the end, and the downward pressure surface 407 is located between the third heat sink 10 of the cylinder head and the fourth heat sink 17 of the cylinder head; an inclined portion is formed on the outer surface of the air guide cover, which is inclined forward (relative to the front and rear direction of the motorcycle) and inward (relative to the left and right direction of the motorcycle) and has a downward pressure surface 407 formed at the end, and the distance between the downward pressure surface 407 and the cylinder head heat sink is in the range of 5mm-10mm. By forming the downward pressure surface 407, the starting point II of the downward pressure surface 407 (relative to the right side of the left and right direction in the figure) is located between the third heat sink 10 of the cylinder head and the fourth heat sink 17 of the cylinder head. Compared with the simple and smooth shape of the air guide cover in the prior art, the cooling air volume of the cylinder body 22 and the cylinder head 21 can be reasonably distributed to avoid excessive cooling air of the cylinder head 21.

[0057] In this embodiment, the air guide cover II4 is provided with a cylinder guide surface 405 and a cylinder head guide surface 404. The cooling air flow of the cooling air duct IV14 passes through the right side of the cylinder 22 and is guided to the cylinder head exhaust side through the cylinder head guide surface 404. The cooling air flow of the cooling air duct V15 passes through the right side of the cylinder 22 and is guided to the cylinder exhaust side heat sink through the cylinder guide surface 405. The cooling air flow of the cooling air duct VI16 passes through the right side of the cylinder 22 and is guided to the cylinder 22 near the crankcase 20 through the cylinder guide surface 405. After the cooling air from the cooling air duct IV14 and the cooling air duct V15 flows through the right side of the cylinder block 22 (relative to the left and right direction of the motorcycle), it flows through the cylinder head guide surface 404 and the cylinder block guide surface 405 respectively, and finally flows through the heat sinks on the exhaust side of the cylinder head and the exhaust side of the cylinder block, thereby ensuring the cooling effect on the right side of the cylinder block 22. The cooling air from the cooling air duct VI16 flows through the right side of the cylinder block 22 and the cylinder block guide surface 405 to the heat sink of the cylinder block 22 close to the crankcase 20, thereby improving the cooling effect on the heat sink on the exhaust side of the cylinder block;

[0058] A guide step 403 is formed between the cylinder guide surface 405 and the cylinder head guide surface 404. The guide step 403 is located at the joint surface 410 between the cylinder head 21 and the cylinder block 22. The guide step 403 is used to guide the cooling air to the cylinder block 22. The guide step 403 is located at the joint surface 410 between the cylinder head 21 and the cylinder block 22 or near the joint surface 410. By providing the guide step 403, the air volume distribution between the cylinder block 22 and the cylinder head 21 on the exhaust side of the engine can be adjusted, the cylinder block 22 is effectively cooled, and the cooling air utilization rate is improved.

[0059] The height of the guide step 403 is 5 to 15 mm. The height of the guide step 403 can be set according to usage requirements.

[0060] In this embodiment, the guide member is a guide plate 5, which is arranged inside the guide cover II 4 and above the side of the cylinder head spark plug I 6 close to the cylinder head air intake side, and is used to guide the cooling air flow of the cooling air duct III 13 to the cylinder head spark plug I 6 area; the shape of the guide plate 5 can be set according to the use needs, and can be a triangular shape, etc. The guide plate 5 is fixedly connected to the guide cover II 4 and is arranged above the cylinder head spark plug I 6 close to the cylinder head air intake side, so that the cooling air flow of the cooling air duct III 13 can be guided to the cylinder head spark plug I 6 area, thereby improving the cooling effect near the cylinder head spark plug I 6 area;

[0061] The bottom edge 502 of the guide plate 5 is lower than the height of the first heat sink 9 of the cylinder head and not lower than the height of the spark plug Ⅰ6 of the cylinder head. The right edge 501 of the guide plate 5 is located between the first heat sink 9 of the cylinder head and the third heat sink 10 of the cylinder head. The first heat sink 9 of the cylinder head is the first one close to the cylinder body heat sink (i.e., the first one from the back to the front relative to the front and rear direction of the motorcycle). The bottom edge 502 of the guide plate 5 is lower than the height of the first heat sink 9 of the cylinder head and not lower than the height of the spark plug Ⅰ6 of the cylinder head (relative to the front and rear direction of the motorcycle). Figure 6 The right edge 501 of the guide plate 5 is located between the first cooling fin 9 of the cylinder head and the third cooling fin 10 of the cylinder head (the right edge is relative to Figure 6 The left and right directions in the cooling air duct are ensured to guide the cooling air diversion of the cooling air duct III 13 to the side of the cylinder head spark plug I 6 close to the intake side.

[0062] In this embodiment, the cylinder head 21 is provided with a cylinder head middle air duct, and the cooling air of the cooling air duct III13 enters the cylinder head middle air duct from both sides of the cylinder head spark plug I6 after being guided by the guide plate 5; the cylinder head 21 is provided with a cylinder head middle air duct, and the setting method is the application of the existing technology, which is not repeated here. The cooling air of the cooling air duct III13 is divided and guided by the guide plate 5 to form two branch air ducts, and the two branch air ducts are respectively located on the side corresponding to the cylinder head spark plug I6 close to the intake side and the exhaust side, and the two branch air ducts are formed on the left and right sides of the cylinder head spark plug I6 ( Figure 5 The cooling air can be diverted to the high temperature area of ​​the cylinder head spark plug Ⅰ6 to improve the cooling effect on the cylinder head spark plug Ⅰ6;

[0063] At least two guide ribs 7 are arranged at intervals in the middle air duct of the cylinder head, which are used to guide the cooling air in the middle air duct of the cylinder head to the spark plugs II 8 of the cylinder head; two guide ribs 7 are arranged in an eight-shaped shape in the middle air duct of the cylinder head, so as to form three channels, which is convenient for diverting part of the cooling air in the middle air duct of the cylinder head to the spark plugs II 8 of the cylinder head, and can meet the cooling requirements of the dual spark plug engine. At the same time, when the cooling air flows through the two guide ribs 7, the flow rate is accelerated, and the spark plugs II 8 of the cylinder head can be fully cooled. Most of the cooling air of the two branch air ducts passes through the exhaust hole I2102 on the exhaust side of the middle of the cylinder head (the middle part is relative to the Figure 5 A small portion of the cooling air flows out from the exhaust hole Ⅱ2101 in the middle of the cylinder head close to the intake side, enters the air deflector Ⅰ3, flows through the right side of the engine (chain box side), and is discharged.

[0064] In this embodiment, the air deflector II 4 is provided with an opening 409, and the opening 409 is provided with a guide structure I 402. The opening 409 is provided on one side of the air deflector II 4 located on the exhaust side of the cylinder body and near the connection between the air deflector II 4 and the crankcase 20; there are multiple openings 409, and by opening the opening 409 on one side of the air deflector II 4 located on the exhaust side of the cylinder body (relative to the lower side of the up and down direction of the motorcycle) and close to the crankcase 20, the airflow of the cylinder heat sink can be reasonably distributed to achieve uniform heat dissipation of the cylinder body 22, and the guide structure I 402 is provided above the opening 409. The guide structure I 402 can be a similar air deflector structure, and the guide structure I 402 covers a part of the opening 409. By providing the guide structure I 402, hot air can be prevented from blowing toward the crankcase 20;

[0065] The air outlet II408 of the air guide cover is located on the exhaust side of the engine, and the air outlet II408 is provided with a guide structure II406 for guiding the cooling air to the exhaust pipe 19; the exhaust side of the engine is the lower side relative to the up and down direction of the motorcycle, and there can be multiple air outlets II408. By setting the air outlet II408 and setting the guide structure II406 at the air outlet II408 at the same time, the guide structure II406 cover is arranged on the outside of the air outlet II408, and the guide structure II406 can be a structure similar to the guide cover, and the size of the guide structure II406 is smaller than the size of the air outlet II408, so that the cooling air flowing out of the air outlet II408 can be guided to the exhaust pipe 19, the exhaust pipe 19 can be cooled, and the hot air can be prevented from flowing back to the air inlet 203 of the fan 1.

[0066] In this embodiment, there are two annular protrusions I202, and the annular protrusions I202 include ribs I and ribs II extending inward and spaced apart; the inner and outer sides are relative to the inner and outer directions or the left and right directions of the motorcycle (i.e. Fig.10 The annular protrusion Ⅰ202 is an annular rib, and the rib Ⅱ is located on the inner side of the rib Ⅰ (relative to the Fig.10 left and right directions);

[0067] The fan cover 2 is provided with an air inlet 203, and the inner wall surface 201 of the air inlet is located between the inner wall surface 1021 of the fan cover and the rib II; the inner wall surface 201 of the air inlet of the fan cover 2 is located between the inner wall surface 1021 of the fan cover and the rib II (relative to Fig.10 left and right directions), so that the amount of cooling air entering from the air inlet 203 of the fan 1 can be increased without increasing the overall volume of the fan cover 2, thereby improving the cooling effect; an annular protrusion II101 is also provided on the fan upper cover 102, and the annular protrusion II101 is also an annular rib and is formed toward the right side relative to the left and right direction of the motorcycle. The annular protrusion II101 is located on the inner side of the rib II and forms a gap with the rib II. By providing the annular protrusion II101, a certain flow guidance and gathering effect can be played on the cooling air entering from the air inlet 203.

[0068] The engine of the present embodiment includes the air cooling system of the engine. The engine of the present invention is provided with an air guide cover, which forms a cooling air duct for cooling the engine, so that the cooling air can be reasonably distributed. Compared with the prior art, sufficient cooling of the engine cylinder block, cylinder head and spark plug area can be achieved, the heat load of the engine can be reduced, and the working performance can be improved. Fig.16 It can be seen from the figure that compared with the prior art, when the cooling system of the present invention is in operation, the wind speed on the spark plug side of the cylinder head is increased by 30%, and the wind speed on the exhaust side is increased by 15%. Fig.17It can be seen that when the cooling system is running, the cylinder head spark plugs Ⅰ6 and Ⅱ8 can be cooled emphatically, and the cooling wind speed flowing through the cylinder head spark plugs Ⅱ8 is increased by 20%, which can achieve efficient heat dissipation of the cylinder head spark plugs Ⅰ6 and Ⅱ8.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An air cooling system for an engine, characterized in that: It includes an engine body and a cooling system, wherein the cooling system includes: A fan assembly, comprising a fan and a fan cover provided with an air outlet I; An air guide cover, used to form a cooling air duct for cooling the engine body, wherein the cooling air duct is connected to the air outlet I; The guide member is arranged in the cooling air duct and is used to form a cooling air branch air duct to guide the cooling air branch to the cylinder head spark plug I near the intake side area.

2. The air cooling system of the engine according to claim 1, characterized in that: The fan assembly also includes a fan upper cover, and the fan cover is provided with a plurality of annular protrusions I, which form a maze structure with the fan upper cover in the axial direction.

3. The air cooling system of the engine according to claim 1, characterized in that: The air deflector is connected to the fan cover, and includes an air deflector I and an air deflector II. Most of the air deflector I is located on the air intake side of the engine and forms a cooling air duct I for cooling the cylinder head and a cooling air duct II for cooling the cylinder body. Most of the air deflector II is located on the exhaust side of the engine and forms cooling air ducts III and IV for cooling the cylinder head and cooling air ducts V and VI for cooling the cylinder body.

4. The air cooling system of the engine according to claim 3, characterized in that: The deflector cover II is provided with a guide air duct, which is used to divert the cooling air of the cooling air duct IV to the exhaust side of the cylinder head to cool the heat sink on the exhaust side of the cylinder head. The starting point I of the guide air duct is located near the connection between the cylinder block and the crankcase and extends in the direction close to the cylinder head to the end position of the heat sink on the exhaust side of the cylinder head and is located between the second heat sink and the fourth heat sink of the cylinder head. An inclined portion is formed on the outer surface of the air guide cover, and the inclined portion is inclined forward and inward, and a downward pressure surface is formed at the end thereof, and the downward pressure surface is located between the third heat sink of the cylinder head and the fourth heat sink of the cylinder head.

5. The air cooling system of the engine according to claim 3, characterized in that: The deflector cover II is provided with a cylinder guide surface and a cylinder head guide surface, the cooling air flow of the cooling air duct IV is guided through the right side of the cylinder body via the cylinder head guide surface to the exhaust side of the cylinder head, the cooling air flow of the cooling air duct V is guided through the right side of the cylinder body via the cylinder guide surface to the heat sink on the exhaust side of the cylinder body, and the cooling air flow of the cooling air duct VI is guided through the right side of the cylinder body via the cylinder guide surface to the heat sink of the cylinder body close to the crankcase; A guide step is formed between the cylinder body guide surface and the cylinder head guide surface, the guide step is located at the joint surface of the cylinder head and the cylinder body, and the guide step is used to guide the cooling air to the cylinder body; The height of the guide step is 5 to 15 mm.

6. The air cooling system of the engine according to claim 3, characterized in that: The guide member is a guide plate, which is arranged inside the guide cover II and above the side of the cylinder head spark plug I close to the cylinder head intake side, and is used to divert the cooling air of the cooling air duct III to the cylinder head spark plug I area; The bottom edge of the guide plate is lower than the height of the first cooling fin of the cylinder head and not lower than the height of the spark plug I of the cylinder head, and the right edge of the guide plate is located between the first cooling fin of the cylinder head and the third cooling fin of the cylinder head.

7. The air cooling system of the engine according to claim 6, characterized in that: The cylinder head is provided with a cylinder head middle air duct, and the cooling air of the cooling air duct III is guided by the guide plate and enters the cylinder head middle air duct from both sides of the cylinder head spark plug I respectively; At least two guide ribs arranged at intervals are arranged in the middle air duct of the cylinder head, which are used to guide the cooling air in the middle air duct of the cylinder head to the spark plug II of the cylinder head.

8. The air cooling system of the engine according to claim 1, characterized in that: The deflector cover II is provided with an opening, the opening is provided with a deflector structure I, and the opening is provided on one side of the deflector cover II located on the exhaust side of the cylinder body and near the connection between the deflector cover II and the crankcase; The air outlet II of the air guide cover is located at the exhaust side of the engine, and the air outlet II is provided with a guide structure II for guiding the cooling air to the exhaust pipe.

9. The air cooling system of the engine according to claim 2, characterized in that: There are two annular protrusions I, and the annular protrusions I include ribs I and ribs II extending inward and arranged at intervals; The fan cover is provided with an air inlet, and the inner wall surface of the air inlet is located between the inner wall surface of the fan upper cover and the rib II.

10. An engine, characterized in that: An air cooling system for an engine comprising the engine as described in any one of claims 1-9.

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