Engine and motorcycle using the same

Abstract

This application discloses an engine and a motorcycle using the engine. The engine includes a housing, a crankshaft, and pistons. The housing includes a cylinder head, and a cylinder head water jacket is provided inside the cylinder head. A cooling connector is provided on the cylinder head water jacket, and the cooling connector includes a cooling housing and a cooling valve body. The cooling valve body is located inside the cooling housing, which is connected to the cylinder head. The cooling housing has a first channel and a second channel that are not interconnected. Both ends of the first channel are connected to the cylinder head water jacket, and the first channel and the cylinder head water jacket together form a continuous circulation channel. The cylinder head water jacket has a liquid inlet. One end of the second channel is connected to the cylinder head water jacket, and the other end is connected to the outside of the cooling housing. From the liquid inlet to the other end of the second channel, the second channel and the cylinder head water jacket together form a non-contiguous outward flow channel. The cooling valve body is used to control the opening and closing of the outward flow channel. In this application, the coolant utilization rate is high.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an engine and a motorcycle using the engine. Background Technology

[0002] Motorcycles are vehicles that are steered by using handlebars to turn the front wheel. They are lightweight, agile, and fast, and are widely used in patrol, passenger and freight transportation, and other fields.

[0003] Motorcycles typically include a frame, body panels, running gear, suspension system, seat, electrical system, engine, and radiator. The engine includes the cylinder block and cylinder head. The cylinder head contains a water jacket, which carries coolant. The coolant in the water jacket connects to both the water jacket and the radiator via two valves. However, current technology cannot regulate the flow of coolant between the water jacket and the radiator. After heat exchange with the cylinder head, the coolant in the water jacket cannot continue to dissipate heat from the cylinder head, resulting in insufficient coolant utilization. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this application is to provide an engine and a motorcycle using the engine, which has a high coolant utilization rate.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] An engine includes a housing, a crankshaft, and a piston. The housing includes a crankcase, a cylinder block connected to the crankcase, and a cylinder head connected to the cylinder block. A cylinder head water jacket is provided within the cylinder head. The crankshaft is located within the crankcase and rotatably connected to the crankcase. The piston is at least partially located within the cylinder block and drively connected to the crankshaft. The reciprocating motion of the piston can drive the crankshaft to rotate about its own centerline. A cooling connector is connected to the cylinder head water jacket. The cooling connector includes a cooling housing and a cooling valve body. The cooling valve body is connected within the cooling housing, and the cooling housing is connected to... The cylinder head; the cooling housing has a first channel and a second channel that are not interconnected. Both ends of the first channel are connected to the cylinder head water jacket, and the first channel and the cylinder head water jacket together form a circulating flow channel that is connected end to end. The cylinder head water jacket is provided with a liquid inlet. One end of the second channel is connected to the inside of the cylinder head water jacket, and the other end is connected to the outside of the cooling housing. The second channel and the cylinder head water jacket together form an outward flow channel that is not connected end to end and extends from the liquid inlet to the other end of the second channel. The cooling valve body is used at least to control the opening and closing of the outward flow channel.

[0007] Furthermore, the cylinder head has a water outlet, and the surface of the water outlet has a first water outlet and a second water outlet. The first water outlet connects the first channel to the cylinder head water jacket, and the second water outlet connects the second channel to the cylinder head water jacket.

[0008] Furthermore, the water outlet is provided with a first fitting wall, and both the first water outlet and the second water outlet are located on the first fitting wall; the cooling housing is provided with a second fitting wall, and one end of the first channel and one end of the second channel are both located on the second fitting wall; the first fitting wall and the second fitting wall are fitted together.

[0009] Furthermore, the cooling connector also includes a sealing ring sandwiched between the first fitting wall and the second fitting wall; the first water outlet, the second water outlet, one end of the first channel, and one end of the second channel are all surrounded by the sealing ring.

[0010] Furthermore, the ratio of the cross-sectional area of ​​the first outlet to the cross-sectional area of ​​the second outlet ranges from 0.014 to 0.017.

[0011] Furthermore, the cooling housing is connected to a plurality of fixing parts, and the first fitting wall is provided with a plurality of mating holes. The fixing parts correspond one-to-one with the mating holes and are detachably connected. The plurality of mating holes are arranged along the outer peripheral edge of the first fitting wall, and one of the mating holes is located on one side of the first water outlet, and the minimum distance between the mating hole and the first water outlet is in the range of 0.1mm to 30mm.

[0012] Furthermore, the second outlet is basically circular, and there are three mating holes; within the first mating wall, the angle between the line connecting the center line of two adjacent mating holes and the center line of the second outlet ranges from 110° to 130°.

[0013] Furthermore, the cooling housing is provided with a first extension and a second extension, the first channel is opened in the first extension and the second channel is opened in the second extension; the second outlet is basically in the shape of a circular hole, and the extension directions of the first extension and the second extension are both basically perpendicular to the center line of the second outlet.

[0014] Furthermore, the outlet of the first channel within the first extension is located at the end of the first extension away from the center line of the first outlet, and the outlet of the second channel within the second extension is located at the end of the second extension away from the center line of the second outlet; when viewed along the center line direction of the second outlet, the angle between the orientation of the outlet of the first channel and the orientation of the outlet of the second channel is set at an obtuse angle.

[0015] To achieve the above objectives, this application also adopts the following technical solution:

[0016] A motorcycle includes a frame, a body panel, and a running gear, the body panel at least partially covering the frame; the running gear at least partially located below the frame; the motorcycle further includes an engine according to any of the above embodiments, the engine being supported by the frame and drivenly connected to the running gear; the motorcycle further includes a radiator communicating with an outward flow channel.

[0017] In this application, by forming two flow channels—a circulating flow channel and an outward flow channel—the coolant can flow only within the circulating flow channel when the engine cylinder head cooling demand is low, achieving low-energy cooling through flow. When the engine cylinder head cooling demand is high, the outward flow channel can transfer at least a portion of the coolant in the cylinder head water jacket to the radiator for heat exchange and cooling before further cooling the cylinder head. Although this increases cooling costs, it results in higher cooling efficiency and faster cooling speed. This design leads to higher coolant utilization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a motorcycle provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the overall structure of the engine provided in an embodiment of this application.

[0020] Figure 3 An exploded schematic diagram of an engine provided in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the combination of the cylinder head and cooling connector of an engine provided in an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the structure of the cooling joint of the engine provided in an embodiment of this application. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, this application provides a motorcycle 100, which includes a frame 11, a body panel 12, a running system 13, a suspension system 14, a seat 15, an electrical system 16, a transmission system (not shown) and an engine 200.

[0025] For ease of description, this application defines the directions of front, back, left, right, up, and down. The front-back direction refers to the length direction of the motorcycle frame 11, the left-right direction refers to the width direction of the motorcycle frame 11, and the up-down direction refers to the height direction of the motorcycle frame 11. In this embodiment, the directions of front, back, left, right, up, and down are based on the motorcycle 100 traveling on a level road surface, not on a sloping road surface.

[0026] The frame 11 serves as the basic framework of the motorcycle 100, supporting the body panel 12, running system 13, suspension system 14, seat 15, electrical system 16, transmission system, and engine 200. The body panel 12 is at least partially located on and connected to the frame 11, protecting the internal components of the motorcycle 100. The running system 13 is at least partially located below the frame 11, and the suspension system 14 connects the running system 13 to the frame 11. The engine 200 is supported by the frame 11. The electrical system 16 is supported by the frame 11 and is at least partially mounted on the body panel 12 or the frame 11. The electrical system 16 displays the motorcycle 100's driving data and controls the motorcycle 100's operation. The seat 15 is supported by the frame 11 and supports the driver and / or passenger. The transmission system transmits power from the engine 200, is supported by the frame 11, and connects the engine 200 to the running system 13.

[0027] like Figure 3As shown, the engine 200 includes a housing 21, a crankshaft 22, a piston (not shown), an ignition mechanism (not shown), an intake mechanism 23, a timing mechanism 25, and a piston mechanism 26. The housing 21 serves as the basic frame of the engine 200, supporting the crankshaft 22, piston, ignition mechanism (not shown), intake mechanism 23, timing mechanism 25, and piston mechanism 26. Specifically, the housing 21 includes, from top to bottom, a cylinder head cover 211, a cylinder head 212, a cylinder block 213, a crankcase 214, and an oil pan 215, connected sequentially. The cylinder head 212 and cylinder block 213 are connected to form a combustion chamber. The intake mechanism 23 is connected to the cylinder head 212 and supplies air to the combustion chamber, allowing air and fuel to mix and form an air-fuel mixture. An ignition mechanism is used to ignite the air-fuel mixture. A piston mechanism 26 is at least partially located within the cylinder block 213, and is used to convert the heat energy generated by the combustion of the air-fuel mixture into mechanical energy. Specifically, the piston mechanism 26 includes a piston, which is used to convert the heat energy into reciprocating mechanical energy. A crankshaft 22 is at least partially located within the crankcase 214, and is rotatably connected to the crankcase 214. The crankshaft 22 is used to convert the reciprocating motion of the piston into rotational motion, and is drively connected to a reduction gear. A timing mechanism 25 is at least partially located within the cylinder head 212, and is drively connected to the crankshaft 22. The timing mechanism 25 is used to control the intake and exhaust of the engine 200.

[0028] like Figure 4 and Figure 5 As shown, in one embodiment, the cylinder head 212 is provided with a cylinder head water jacket 212h for cooling the cylinder head 212. The motorcycle 100 also includes a radiator (not shown), which is connected to the cylinder head water jacket 212h and is used to cool the engine 200 at least.

[0029] The engine 200 includes a cooling assembly 30, which is connected to the cylinder head water jacket 212h. The cooling assembly 30, in conjunction with the cylinder head water jacket 212h, enables internal circulation of the coolant. The cooling assembly 30, in conjunction with the radiator and cylinder head water jacket 212h, enables external circulation of the coolant.

[0030] Specifically, the cooling assembly 30 includes a cooling connector 39, which connects the radiator and the cylinder head water jacket 212h. Specifically, the cooling connector 39 includes a cooling housing 391 and a cooling valve body 392. The cooling housing 391 serves as the basic frame of the cooling connector 39 and is connected to the cylinder head 212. More specifically, the cooling housing 391 communicates with the cylinder head water jacket 212h, allowing the radiator to communicate with the cylinder head water jacket 212h through the cooling housing 391.

[0031] In this embodiment, the cooling housing 391 has a first channel 3911 and a second channel 3912 that are not interconnected. Both ends of the first channel 3911 are connected to the cylinder head water jacket 212h, and the first channel 3911 and the cylinder head water jacket 212h together form a continuous circulation channel. Coolant circulates within this channel to provide a shallow cooling effect on the cylinder head water jacket 212h. The cylinder head water jacket 212h has a liquid inlet (not shown), which can be selected as the liquid inlet of the cylinder head water jacket 212h. One end of the second channel 3912 is connected to the inside of the cylinder head water jacket 212h, and the other end is connected to the outside of the cooling housing 391. Optionally, this other end can be connected to the radiator inlet. The second channel 3912 and the cylinder head water jacket 212h together form a non-connected outward flow channel from the liquid inlet to the other end of the second channel 3912. The coolant in the outward flow channel can be cooled by heat exchange as it passes through the radiator, and when it returns to the cylinder head water jacket 212h, it can provide a deeper level of cooling to the cylinder head water jacket 212h. The cooling valve body 392 is used to control the opening and closing of the outward flow channel. In some other embodiments, the cooling valve body 392 can control the connection or disconnection between the second channel 3912 and the cylinder head water jacket 212h, and it can also control the connection and disconnection between the first channel 3911 and the cylinder head water jacket 212h.

[0032] In some embodiments, the cylinder block 213 is provided with a cylinder water jacket (not shown). The cylinder water jacket and the cylinder head water jacket 212h are connected and used to cool the cylinder block 213. More specifically, coolant flows through the cylinder water jacket and the cylinder head water jacket 212h, and a first channel 3911 is used for coolant circulation within the cylinder water jacket and the cylinder head water jacket 212h to achieve cooling of the cylinder head 212 and the cylinder block 213.

[0033] With the above settings, when the cooling valve body 392 controls the second channel 3912 to disconnect from the cylinder head water jacket 212h, the coolant flowing through the cooling connector 39 can only cool the cylinder block 213 and cylinder head 212 through the first channel 3911, which helps to increase the flow rate of coolant in the cylinder water jacket and cylinder head water jacket 212h, and thus helps to improve the cooling effect of the cylinder head 212 and cylinder block 213. When the cooling valve body 392 controls the second channel 3912 to connect with the cylinder head water jacket 212h, the coolant flowing through the cooling connector 39 can be split through the first channel 3911 and the second channel 3912. The coolant can simultaneously flow through the radiator from the second channel 3912, thereby cooling the radiator. The coolant also flows through the cylinder water jacket and cylinder head water jacket 212h from the first channel 3911, so that after being cooled by the radiator, the coolant can cool the cylinder head 212 and cylinder block 213 through the second channel 3912, which helps to improve the cooling effect of the cylinder head 212 and cylinder block 213. This configuration allows the cooling valve body 392 to be opened based on the cooling requirements of the motorcycle 100, thus connecting the second channel 3912 with the cylinder head water jacket 212h. Alternatively, the cooling valve body 392 can be closed to disconnect the second channel 3912 from the cylinder head water jacket 212h. This enables the radiator to cool the coolant when it cannot cool the cylinder head 212 and cylinder block 213, allowing the cooled coolant to continue cooling the cylinder head 212 and cylinder block 213. Therefore, while meeting the coolant requirements of the cylinder head 212, cylinder block 213, and radiator, the utilization rate of the coolant can be improved.

[0034] Furthermore, in this application, the flow of coolant in the cylinder water jacket and cylinder head water jacket 212h and the control of coolant flow in the radiator can be achieved through a single cooling connector 39, thereby eliminating the need to lay out multiple openings and pipes on the cylinder head 212, which is beneficial to improving the structural compactness of the cylinder head 212.

[0035] It should be noted that this application does not limit the type of cooling valve body 392, as long as the cooling valve body 392 can control the connection or disconnection between the second channel 3912 and the cylinder head water jacket 212h.

[0036] In one embodiment, the cylinder head 212 has a water outlet 2123, and the surface of the water outlet 2123 has a first water outlet 2123a and a second water outlet 2123b. The first water outlet 2123a connects the first channel 3911 to the cylinder head water jacket 212h, and the second water outlet 2123b connects the second channel 3912 to the cylinder head water jacket 212h. This arrangement allows the coolant in the cylinder head water jacket 212h to flow out through the first water outlet 2123a and the first channel 3911, and then re-enter the cylinder head water jacket 212h through a pipeline, thereby cooling the cylinder head 212. Furthermore, when the second water outlet 2123b is connected to the second channel 3912, the coolant in the cylinder head water jacket 212h flows out through the second water outlet 2123b and the second channel 3912 into the radiator, thereby cooling the coolant through the radiator.

[0037] As an optional implementation, the cooling valve body 392 is located within the second channel 3912 and the second outlet 2123b, and cannot be used to control the connection or disconnection between the first channel 3911 and the cylinder head water jacket 212h. With this configuration, by controlling the opening of the second outlet 2123b via the cooling valve body 392, the coolant in the cylinder head water jacket 212h can be diverted through the first outlet 2123a and the second outlet 2123b, allowing the coolant to enter the cylinder water jacket, cylinder head water jacket 212h, and radiator respectively. By controlling the closing of the second outlet 2123b via the cooling valve body 392, the coolant in the cylinder head water jacket 212h can only enter the cylinder water jacket and cylinder head water jacket 212h through the first outlet 2123a, thus facilitating control of the coolant flow direction within the cylinder head water jacket 212h.

[0038] In one embodiment, the water outlet 2123 is provided with a first fitting wall 2123c, and both the first water outlet 2123a and the second water outlet 2123b are located on the first fitting wall 2123c; the cooling housing 391 is provided with a second fitting wall 3916, and one end of the first channel 3911 and one end of the second channel 3912 are located on the second fitting wall 3916. The first fitting wall 2123c and the second fitting wall 3916 are fitted together. This arrangement improves the sealing performance between the water outlet 2123 and the cooling housing 391, preventing coolant leakage and thus improving coolant utilization.

[0039] As an optional implementation, the cooling connector 39 also includes a sealing ring 393, which is sandwiched between the first mating wall 2123c and the second mating wall 3916. This arrangement improves the sealing between the cooling connector 39 and the water outlet 2123 through the sealing ring 393. Specifically, the first water outlet 2123a, the second water outlet 2123b, one end of the first channel 3911, and one end of the second channel 3912 are all surrounded by the sealing ring 393. This arrangement allows for the sealing of both the first water outlet 2123a and the second water outlet 2123b with a single sealing ring 393, eliminating the need for two separate sealing rings 393 to seal the first and second water outlets 2123b. This reduces the number of sealing rings used and consequently lowers the production cost of the motorcycle 100.

[0040] In one implementation, the ratio of the cross-sectional area of ​​the first outlet 2123a to the cross-sectional area of ​​the second outlet 2123b ranges from 0.014 to 0.017. This setting avoids the ratio being too large, which could interfere with the assembly of the cooling valve body 392. Furthermore, it also avoids the ratio being too small, which could result in an insufficient coolant flow area at the first outlet 2123a, thus improving the coolant flow efficiency in the cylinder head water jacket 212h.

[0041] In one embodiment, the cooling housing 391 is connected to a plurality of fixing parts 3915, and the first mating wall 2123c is provided with a plurality of mating holes 2123d. The fixing parts 3915 correspond one-to-one with the mating holes 2123d and are detachably connected. Specifically, the plurality of mating holes 2123d are arranged along the outer peripheral edge of the first mating wall 2123c. One of the mating holes 2123d is located on one side of the first water outlet 2123a, and the minimum distance D16 between it and the first water outlet 2123a ranges from 0.1mm to 30mm. This arrangement, with the mating hole 2123d close to the first water outlet 2123a, improves the sealing performance of the first water outlet 2123a when the first mating wall 2123c and the second mating wall 3916 are mated. In some embodiments, a fixing hole is provided on the fixing part 3915, and a screw is inserted through the fixing hole of the cooling housing 391 and fixedly connected with the mating hole 2123d, thereby improving the connection stability of the cooling housing 391 and the cylinder head 212.

[0042] In one embodiment, the second outlet 2123b is basically circular, and three mating holes 2123d are provided. Within the first mating wall 2123c, the angle Φ between the line connecting the centerline of two adjacent mating holes 2123d and the centerline of the second outlet 2123b ranges from 110° to 130°. Specifically, the angle Φ between the line connecting the centerline of two adjacent mating holes 2123d and the centerline of the second outlet 2123b ranges from 115° to 125°. The angle Φ between the line connecting the centerline of two adjacent mating holes 2123d and the centerline of the second outlet 2123b is 120°. This arrangement prevents instability when the cooling housing 391 is connected to the cylinder head 212 due to excessively large or small angle Φ, thus improving the connection stability between the cooling housing 391 and the cylinder head 212, thereby enhancing the sealing performance of the first mating wall 2123c and the second mating wall 3916.

[0043] It should be noted that this application does not limit the number of fixed parts 3915.

[0044] In one embodiment, the cooling housing 391 is connected to a first extension 3913 and a second extension 3914, a first channel 3911 is formed in the first extension 3913, and a second channel 3912 is formed in the second extension 3914.

[0045] Specifically, the second outlet 2123b is basically circular, and the extension directions of the first extension 3913 and the second extension 3914 are both basically perpendicular to the centerline of the second outlet 2123b. This arrangement avoids the extension directions of the first extension 3913 and the second extension 3914 from tilting towards the cooling housing 391, thus preventing interference between the pipes connected to the first extension 3913 and the second extension 3914 and the cooling housing 391, thereby facilitating the connection of the pipes in the first extension 3913 and the second extension 3914. Furthermore, it avoids the extension directions of the first extension 3913 and the second extension 3914 from tilting away from the cooling housing 391, which could cause the pipes connected to the first extension 3913 and the second extension 3914 to interfere with the assembly of other components, thereby improving the space utilization of the cooling connector 39 and enhancing the structural compactness of the cooling connector 39.

[0046] The outlet of the first channel 3911 within the first extension 3913 is located at the end of the first extension 3913 away from the centerline of the first outlet 2123a, and the outlet of the second channel 3912 within the second extension 3914 is located at the end of the second extension 3914 away from the centerline of the second outlet 2123b. Viewed along the centerline of the second outlet 2123b, the angle between the orientation of the outlet of the first channel 3911 and the orientation of the outlet of the second channel 3912 is obtuse.

[0047] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An engine, comprising: The housing includes a crankcase, a cylinder block connected to the crankcase, and a cylinder head connected to the cylinder block, wherein a cylinder head water jacket is provided inside the cylinder head; and a crankshaft located inside the crankcase and rotatably connected to the crankcase. A piston, at least partially located within the cylinder body and connected to the crankshaft via a drive mechanism, wherein the reciprocating motion of the piston can drive the crankshaft to rotate about its own centerline. Its features are, A cooling connector is connected to the cylinder head water jacket. The cooling connector includes a cooling housing and a cooling valve body. The cooling valve body is connected inside the cooling housing, and the cooling housing is connected to the cylinder head. The cooling housing has a first channel and a second channel that are not interconnected. Both ends of the first channel are connected to the cylinder head water jacket, and the first channel and the cylinder head water jacket together form a circulating flow channel that is connected end to end. The cylinder head water jacket has a liquid inlet. One end of the second channel is connected to the inside of the cylinder head water jacket, and the other end is connected to the outside of the cooling housing. The second channel and the cylinder head water jacket together form an outward flow channel that is not connected end to end and extends from the liquid inlet to the other end of the second channel. The cooling valve body is used to control the opening and closing of the outward flow channel.

2. The engine according to claim 1, characterized in that, The cylinder head has a water outlet, and the surface of the water outlet has a first water outlet and a second water outlet. The first water outlet connects the first channel to the cylinder head water jacket, and the second water outlet connects the second channel to the cylinder head water jacket.

3. The engine according to claim 2, characterized in that, The water outlet is provided with a first fitting wall, and the first water outlet and the second water outlet are both located on the first fitting wall; the cooling shell is provided with a second fitting wall, and one end of the first channel and one end of the second channel are both located on the second fitting wall; the first fitting wall and the second fitting wall are fitted together.

4. The engine according to claim 3, characterized in that, The cooling connector also includes a sealing ring, which is sandwiched between the first fitting wall and the second fitting wall; the first water outlet, the second water outlet, one end of the first channel and one end of the second channel are all surrounded by the sealing ring.

5. The engine according to claim 3, characterized in that, The ratio of the cross-sectional area of ​​the first outlet to the cross-sectional area of ​​the second outlet ranges from 0.014 to 0.

017.

6. The engine according to claim 3, characterized in that, The cooling housing is connected to multiple fixing parts, and the first fitting wall is provided with multiple mating holes. The fixing parts correspond one-to-one with the mating holes and are detachably connected. The multiple mating holes are arranged along the outer peripheral edge of the first fitting wall, and one of the mating holes is located on one side of the first water outlet, and the minimum distance between the mating hole and the first water outlet is in the range of 0.1mm to 30mm.

7. The engine according to claim 6, characterized in that, The second outlet is basically circular, and there are three mating holes. Within the first mating wall, the angle between the line connecting the center line of two adjacent mating holes and the center line of the second outlet is between 110° and 130°.

8. The engine according to claim 2, characterized in that, The cooling housing is provided with a first extension and a second extension, the first channel is opened in the first extension and the second channel is opened in the second extension; the second outlet is basically in the shape of a circular hole, and the extension directions of the first extension and the second extension are basically perpendicular to the center line of the second outlet.

9. The engine according to claim 8, characterized in that, The outlet of the first channel within the first extension is located at the end of the first extension away from the center line of the first outlet, and the outlet of the second channel within the second extension is located at the end of the second extension away from the center line of the second outlet; when viewed along the center line of the second outlet, the angle between the orientation of the outlet of the first channel and the orientation of the outlet of the second channel is set at an obtuse angle.

10. A motorcycle, comprising: Frame; A body panel that at least partially covers the vehicle frame; A walking system, at least partially located below the vehicle frame; Its features are, The motorcycle further includes an engine as described in any one of claims 1 to 9, the engine being supported by the frame and drivenly connected to the running system; the motorcycle further includes a radiator communicating with the outward flow channel.

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