Engines and motorcycles

Abstract

The present application relates to an engine and a motorcycle. The engine includes a cylinder block and a flow partition. The cylinder block is provided with a cooling chamber and a mounting chamber connected to the cooling chamber. The flow partition is provided in the mounting chamber and is used to cause the coolant to flow in the cooling chamber in the same direction. The expansion coefficient of the flow partition is the same as that of the cylinder block. Because the flow partition is provided in the mounting chamber, the flow partition guides the coolant flowing into the cooling chamber so that the coolant flows in the same direction within the cooling chamber, which helps to improve the flow efficiency of the coolant, improve the cooling effect, and ensure that the engine can perform at its best. Because the expansion coefficient of the flow partition is substantially the same as that of the cylinder block, the gap between the flow partition and the cooling chamber remains unchanged regardless of whether the engine is operating at low or high temperatures. In this way, the flow partition maintains the same barrier and flow guidance functions in both high and low temperature operating states, ensuring the stability of the engine performance.

Description

Technical Field

[0001] The present application relates to the technical field of motorcycles, and in particular to an engine and a motorcycle. Background Art

[0002] Depending on the cooling medium, engines are divided into air-cooled engines and water-cooled engines, among which water-cooled engines use coolant as the cooling medium.

[0003] The cylinder block of a water-cooled engine has a cooling chamber where coolant circulates, cooling the cylinder block and maintaining the engine operating below a preset temperature, ensuring optimal performance. To improve cooling efficiency, flow barriers are often installed within the cooling chamber. These barriers block the flow of coolant into the chamber, ensuring that the coolant flows in a single direction. However, after prolonged engine operation, flow barriers can affect engine performance stability. Summary of the Invention

[0004] Based on this, it is necessary to provide an engine and a motorcycle that can ensure the stability of engine performance.

[0005] An engine, comprising:

[0006] a cylinder body, the cylinder body being provided with a cooling cavity and a mounting cavity communicating with the cooling cavity; and

[0007] A flow partition is provided in the installation cavity, and is used to make the coolant flow in the cooling cavity in the same direction. The expansion coefficient of the flow partition is substantially the same as the expansion coefficient of the cylinder body.

[0008] In the aforementioned engine, the flow partition is provided within the cooling chamber. This partition guides coolant flowing into the cooling chamber, ensuring that the coolant flows in the same direction within the cooling chamber. This improves coolant flow efficiency, enhances cooling effectiveness, and ensures optimal engine performance. Because the expansion coefficient of the flow partition is substantially the same as that of the cylinder block, the gap between the flow partition and the cooling chamber remains constant regardless of whether the engine is operating at low or high temperatures. This maintains the same flow-blocking and diverting function in both high and low temperature conditions, thereby ensuring stable engine performance.

[0009] In one embodiment, the difference between the expansion coefficient of the flow partition and the expansion coefficient of the cylinder does not exceed 10%.

[0010] In one embodiment, the flow partition is loosely fitted with a cavity wall of the installation cavity.

[0011] In one embodiment, the flow partition includes a flow partition body and a limiting portion. The flow partition body is arranged in the installation cavity and is used to make the coolant flow in the cooling cavity in the same direction. The limiting portion is provided on the flow partition body and cooperates with the cavity wall of the installation cavity to limit the axial rotation of the flow partition body.

[0012] In one embodiment, the flow partition body includes a first end surface, the limiting portion is provided on the first end surface, and the limiting portion extends from an edge of the first end surface in a direction away from a central axis of the flow partition body.

[0013] In one embodiment, the flow partition further includes a fixing portion, which is provided on the first end surface and connected to the limiting portion. The fixing portion extends from the limiting portion toward a direction close to the central axis of the flow partition body.

[0014] In one embodiment, the limiting portion is provided with a first liquid flow channel, which is connected to the cooling cavity; the fixing portion is provided with a second liquid flow channel, which is connected to the first liquid flow channel and the cooling cavity respectively.

[0015] In one embodiment, a liquid flow groove is provided at the bottom of the mounting cavity, the liquid flow groove being recessed in a direction away from the flow partition and being in communication with the cooling cavity; the flow partition body further comprises a second end face, the second end face covering the notch of the liquid flow groove and abutting against the bottom of the mounting cavity to limit axial movement of the flow partition along the flow partition body.

[0016] In one embodiment, the installation cavity is provided at a position of the cylinder body close to the water inlet of the cooling cavity.

[0017] A motorcycle comprises a motorcycle body and the engine, wherein the engine is mounted on the motorcycle body.

[0018] The motorcycle features a flow divider within the cooling chamber, which guides coolant flowing into the chamber, ensuring that the coolant flows in a uniform direction. This improves coolant flow efficiency, enhances cooling effectiveness, and ensures optimal engine performance. Because the expansion coefficient of the flow divider is substantially the same as that of the cylinder block, the gap between the flow divider and the cooling chamber remains constant regardless of whether the engine is operating at low or high temperatures. This maintains the flow divider's barrier and diversion functions consistent in both high and low temperature conditions, thereby ensuring stable engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic structural diagram of an engine according to an embodiment of the present application.

[0020] Figure 2 for Figure 1 Top view of the engine.

[0021] Figure 3 for Figure 2 A local enlarged schematic diagram of point A.

[0022] Figure 4 for Figure 2 Cross-sectional view along BB.

[0023] Figure 5 for Figure 4 A local enlarged schematic diagram of point C.

[0024] Figure 6 for Figure 2 Schematic diagram of the structure of the engine's flow partition.

[0025] Explanation of the accompanying reference numerals: 10. Cylinder body; 11. Cooling chamber; 12. Mounting chamber; 121. Liquid flow groove; 13. Water inlet chamber; 14. Cylinder body; 15. Cylinder liner; 16. Water jacket; 20. Flow partition; 21. Flow partition body; 211. First end face; 212. Second end face; 22. Limiting portion; 221. First liquid flow channel; 23. Fixing portion; 231. Second liquid flow channel; 30. Water pump. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0027] The engine's cylinder block 10 has a cooling chamber 11. Coolant circulates within this chamber to cool the cylinder block 10, maintaining the engine operating below a preset temperature and ensuring optimal engine performance. To improve cooling efficiency, a flow barrier 20 is typically installed within the cooling chamber 11. This barrier blocks the flow of coolant into the cooling chamber 11, ensuring that the coolant flows in a single direction. Existing flow barrier 20 is made of rubber and secured within the cooling chamber 11 using an interference fit. After prolonged engine operation, the gap between the flow barrier 20 and the cooling chamber 11 changes, causing the barrier 20's water-isolating function to become inconsistent with low-temperature operation, impacting engine stability. Furthermore, after prolonged engine operation, the barrier 20's heat-aging resistance degrades, making it susceptible to separation from the cylinder block 10. This contamination of the coolant can lead to engine blockage and, in turn, compromised engine reliability.

[0028] See Figure 1 and Figure 2 , Figure 1 FIG. 1 shows a schematic structural diagram of an engine in an embodiment of the present application. Figure 2 Shown Figure 1 FIG. 1 is a top view of an engine. An engine provided by one embodiment of the present application includes a cylinder block 10 and a flow partition 20. The cylinder block 10 defines a cooling chamber 11 and a mounting chamber 12 communicating with the cooling chamber 11. The flow partition 20 is disposed within the mounting chamber 12 and is configured to direct the coolant within the cooling chamber 11 to flow in the same direction. The expansion coefficient of the flow partition 20 is substantially the same as that of the cylinder block 10.

[0029] In the aforementioned engine, the flow partition 20 is provided within the mounting cavity 12. This partition 20 guides coolant flowing into the cooling cavity 11, ensuring that the coolant flows in the same direction within the cooling cavity 11. This improves coolant flow efficiency, enhances cooling effectiveness, and ensures optimal engine performance. Because the expansion coefficient of the flow partition 20 is substantially the same as that of the cylinder block 10, the gap between the flow partition 20 and the cooling cavity 11 remains constant regardless of whether the engine is operating at low or high temperatures. Thus, the flow partition 20 maintains consistent flow blocking and guiding functions in both high and low temperature conditions, thereby ensuring stable engine performance.

[0030] In one embodiment, both the cylinder block 10 and the flow partition 20 are made of metal. Due to the good heat resistance of metal, the flow partition 20 is not easily detached after the engine has been running for a long time, which prevents the coolant from being contaminated, avoids engine blockage, and ensures the reliability of engine operation.

[0031] Optionally, the cylinder body 10 is an aluminum matrix, and the flow partition 20 is also an aluminum matrix. Of course, in other embodiments, the cylinder body 10 and the flow partition 20 can also be made of other materials, and are not limited thereto.

[0032] It should be noted that even though the cylinder block 10 and the flow partition 20 are both made of aluminum-based materials, their compositions may differ, resulting in slightly different coefficients of expansion. Therefore, in one embodiment, the difference between the expansion coefficient of the flow partition and that of the cylinder block does not exceed 10%. This ensures that the gap between the flow partition 20 and the cooling chamber 11 remains constant, regardless of whether the engine is operating at low or high temperatures. This ensures that the flow partition 20 maintains its consistent function of blocking and guiding airflow in both high and low temperature conditions, thereby ensuring stable engine performance.

[0033] In one embodiment, see Figure 2 and Figure 3 , Figure 2 Shown Figure 1 A top view of the engine. Figure 3 Shown Figure 2 The enlarged partial view of point A shows that the flow partition 20 is fitted with a clearance between the walls of the mounting cavity 12. During assembly, the flow partition 20 is placed in the mounting cavity 12. The clearance between the flow partition 20 and the walls of the mounting cavity 12 is fitted, facilitating assembly and improving assembly efficiency.

[0034] In one embodiment, see Figure 2 、 Figure 3 and Figure 6 , Figure 2 Shown Figure 1 A top view of the engine. Figure 3 Shown Figure 2 A local enlarged schematic diagram of point A, Figure 6 Shown Figure 2 The flow partition 20 of the engine is schematically shown. The flow partition 20 includes a flow partition body 21 and a stopper 22. The flow partition body 21 is used to direct the coolant flow in the cooling cavity 11 in a uniform direction. The stopper 22 is provided on the flow partition body 21 and engages with the wall of the mounting cavity 12 to limit the flow partition body 21 from rotating about its axis. During assembly, the flow partition body 21 is inserted into the mounting cavity 12. The flow partition body 21 guides the coolant flowing into the cooling cavity 11, ensuring that the coolant flows in a uniform direction within the cooling cavity 11. This improves the coolant flow efficiency, enhances the cooling effect, and ensures optimal engine performance. Furthermore, the flow partition body 21 is provided with a stopper 22, which engages with the wall of the mounting cavity 12 to prevent the flow partition body 21 from rotating about its axis under the influence of the coolant, thereby ensuring the flow partition 20's diversion function.

[0035] It can be understood that the limiting portion 22 is almost in contact with the cavity wall of the installation cavity 12 . For example, the interval between the limiting portion 22 and the cavity wall of the installation cavity 12 is 0.05 mm.

[0036] In this embodiment, refer to Figure 6 , the flow partition 20 can be a water blocking pin, wherein the flow partition body 21 is a cylinder. Of course, in other embodiments, the flow partition body 21 can also be a square body.

[0037] In one embodiment, see Figure 2 、 Figure 3 and Figure 6 The flow partition 21 includes a first end surface 211. The stopper 22 is provided on the first end surface 211. The stopper 22 extends from the edge of the first end surface 211 in a direction away from the central axis of the flow partition 21. It is understood that the stopper 22 is located on the periphery of the flow partition 21. Thus, the flow partition 21 is provided with the stopper 22. The stopper 22 cooperates with the wall of the mounting cavity 12 to prevent the flow partition 21 from rotating about its axis under the influence of the coolant, thereby ensuring the flow diversion function of the flow partition 20.

[0038] Of course, in other embodiments, the limiting portion 22 may also be provided on the peripheral side of the flow partitioning body 21 , and is not limited thereto.

[0039] Optionally, the limiting portion 22 is a first limiting block. Of course, in other embodiments, the limiting portion 22 can also be other structures, which is not limited to this.

[0040] Further, see Figure 2 、 Figure 4 and Figure 5 , Figure 2 Shown Figure 1 A top view of the engine. Figure 4 Shown Figure 2 The cross-sectional view along BB, Figure 5 Shown Figure 4 A partial enlarged schematic diagram of point C of the embodiment of the present invention is shown. The limiting portion 22 is provided with a first liquid flow channel 221, which is in communication with the cooling chamber 11. After the coolant flows into the cooling chamber 11 through the water inlet of the cooling chamber 11, the coolant flows in the same direction under the action of the flow dividing body 21. After the coolant flows along the cooling chamber 11 to one side of the flow dividing body 21, the coolant flows to the other side of the flow dividing body 21 through the first liquid flow channel 221. In this way, under the action of the first liquid flow channel 221, the coolant in the cooling chamber 11 can circulate rather than accumulate statically. In this way, the coolant circulates in the cooling chamber 11 to cool the cylinder block 10, allowing the engine to operate below a preset temperature and ensuring that the engine can achieve optimal performance.

[0041] In one embodiment, see Figure 2 、 Figure 3 and Figure 6 The flow partition 20 further includes a fixing portion 23 disposed on the first end surface 211 and connected to the limiting portion 22. The fixing portion 23 extends from the limiting portion 22 toward the central axis of the flow partition body 21. This arrangement increases the connection area between the limiting portion 22 and the flow partition body 21, ensuring that the limiting portion 22 will not crack or even break due to insufficient strength when restricting the flow partition body 21 from rotating about its axis.

[0042] Optionally, the fixing portion 23 is a fixing block, and the fixing block and the first limiting block are an integrally formed structure, for example, a whole aluminum rod is processed by turning.

[0043] Further, see Figure 2 、 Figure 4 and Figure 5 The fixed portion 23 is provided with a second liquid flow channel 231, which is connected to the first liquid flow channel 221 and the cooling chamber 11, respectively. After the coolant flows into the cooling chamber 11 through the water inlet of the cooling chamber 11, it is guided in the same direction by the flow dividing body 21. After flowing along the cooling chamber 11 to one side of the flow dividing body 21, the coolant flows sequentially through the first liquid flow channel 221 and the second liquid flow channel 231 to the other side of the flow dividing body 21. With this arrangement, the first liquid flow channel 221 and the second liquid flow channel 231 cooperate to allow the coolant in the cooling chamber 11 to circulate, rather than stagnating. This circulation of the coolant within the cooling chamber 11 cools the cylinder block 10, maintaining engine operation below a preset temperature and ensuring optimal engine performance.

[0044] In this embodiment, see Figure 3 The first liquid flow channel 221 extends in the same direction as the second liquid flow channel 231. For example, the central axis of the first liquid flow channel 221 coincides with the central axis of the second liquid flow channel 231. This arrangement helps improve the flow efficiency of the coolant, thereby improving the cooling effect and ensuring optimal engine performance. Of course, in other embodiments, the first liquid flow channel 221 may also be arranged at an angle to the second liquid flow channel 231, and this is not limited to this.

[0045] In one embodiment, see Figure 4 、 Figure 5 and Figure 6The bottom of the mounting cavity 12 is provided with a liquid flow groove 121, recessed away from the flow partition 20 and communicating with the cooling cavity 11. The flow partition body 21 also includes a second end surface 212, opposite the first end surface 211. This second end surface 212 covers the notch of the liquid flow groove 121 and abuts against the bottom of the mounting cavity 12, restricting axial movement of the flow partition 20 along the flow partition body 21. The liquid flow groove 121 allows the coolant in the cooling cavity 11 to circulate, rather than stagnating. This circulation of coolant within the cooling cavity 11 cools the cylinder block 10, maintaining engine operation below a preset temperature and ensuring optimal engine performance. In addition, the second end surface 212 of the flow partition body 21 covers the notch of the liquid flow channel 121 and abuts against the bottom of the installation cavity 12. This can limit the axial movement of the flow partition 20 along the flow partition body 21, thereby ensuring the flow diversion function of the flow partition 20.

[0046] In one embodiment, see Figure 2 The installation chamber 12 is located in the cylinder block 10 near the water inlet of the cooling chamber 11. By arranging the installation chamber 12 near the water inlet of the cooling chamber 11, the flow partition 20 within the installation chamber 12 guides the coolant entering the cooling chamber 11 through the water inlet, so that the coolant in the cooling chamber 11 flows in the same direction. This helps to improve the flow efficiency of the coolant, thereby improving the cooling effect and ensuring that the engine can achieve optimal performance.

[0047] In one embodiment, see Figure 1 The cylinder block 10 is also provided with a water inlet channel. The engine further includes a water pump 30, the water outlet of which is connected to the cooling chamber 11 through the water inlet channel. When the engine is operating, the water pump 30 is activated and injects coolant into the cooling chamber 11 through the water inlet channel. The coolant circulates within the cooling chamber 11 to cool the cylinder block 10, maintaining the engine operating below a preset temperature and ensuring optimal engine performance.

[0048] Specifically, see Figure 1 and Figure 2 The cylinder block 10 includes a cylinder body 14, a cylinder liner 15, and a water jacket 16. The cylinder body 14 has an inner cavity, within which the cylinder barrel and the water jacket 16 are located. The water jacket 16 is sleeved over the cylinder barrel. The outer surface of the water jacket 16 and the inner cavity wall form a cooling cavity 11, which is arranged circumferentially around the cylinder barrel. Furthermore, the engine also includes a casing, which is integrally formed with the cylinder body 14.

[0049] See Figure 2 and Figure 3Due to the positions of the water inlet channel and the cooling chamber 11, and taking into account the optimization of casting pores, etc., the cylinder body 10 also has a water inlet chamber 13, which is communicated with the water inlet channel and the cooling chamber 11 respectively.

[0050] See Figure 1 and Figure 2 The motorcycle provided in this application includes a motorcycle body and an engine according to any one of the above embodiments, wherein the engine is installed on the motorcycle body.

[0051] In the aforementioned motorcycle, the flow partition 20 is provided within the cooling chamber 11. This partition 20 guides the coolant flowing into the cooling chamber 11, ensuring that the coolant flows in the same direction within the cooling chamber 11. This improves coolant flow efficiency, enhances cooling effectiveness, and ensures optimal engine performance. Because the expansion coefficient of the flow partition 20 is substantially the same as that of the cylinder block 10, the gap between the flow partition 20 and the cooling chamber 11 remains constant regardless of whether the engine is operating at low or high temperatures. Thus, the flow partition 20 maintains consistent flow blocking and guiding functions in both high and low temperature operating states, thereby ensuring stable engine performance.

[0052] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0053] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An engine, characterized in that: include: A cylinder body, wherein the cylinder body is provided with a cooling cavity and a mounting cavity communicated with the cooling cavity; as well as A flow partition, the flow partition is arranged in the installation cavity, the flow partition is used to make the coolant flow in the cooling cavity in the same direction, the expansion coefficient of the flow partition is substantially the same as the expansion coefficient of the cylinder body; the cylinder body and the flow partition are both metal parts; the flow partition includes a flow partition body, a limiting portion and a fixing portion, the flow partition body is arranged in the installation cavity, the flow partition body is used to make the coolant flow in the cooling cavity in the same direction, the flow partition body includes a first end face, the limiting portion is arranged on the first end face, the limiting portion is The edge extends in a direction away from the central axis of the flow partition body, and the limiting portion cooperates with the cavity wall of the installation cavity to limit the axial rotation of the flow partition body around the flow partition body; the fixing portion is provided on the first end surface, the fixing portion is connected to the limiting portion, and the fixing portion extends from the limiting portion in a direction close to the central axis of the flow partition body; the limiting portion is provided with a first liquid flow channel, and the first liquid flow channel is connected to the cooling cavity; the fixing portion is provided with a second liquid flow channel, and the second liquid flow channel is connected to the first liquid flow channel and the cooling cavity respectively.

2. The engine according to claim 1, characterized in that The difference between the expansion coefficient of the flow partition and the expansion coefficient of the cylinder does not exceed 10%.

3. The engine according to claim 1, characterized in that The flow partition is loosely matched with the cavity wall of the installation cavity.

4. The engine according to claim 1, characterized in that A liquid flow groove is provided at the bottom of the installation cavity, the liquid flow groove is recessed in a direction away from the flow partition, and the liquid flow groove is communicated with the cooling cavity; The flow partition body further includes a second end surface, which covers the notch of the liquid flow channel and abuts against the bottom of the installation cavity to limit the axial movement of the flow partition along the flow partition body.

5. The engine according to claim 1, characterized in that An extending direction of the first liquid flow channel is the same as an extending direction of the second liquid flow channel.

6. The engine according to claim 1, characterized in that The cylinder body is provided with a water inlet channel; the engine further comprises a water pump, and the water outlet of the water pump is communicated with the cooling cavity through the water inlet channel.

7. The engine according to claim 6, characterized in that The cylinder body further comprises a water inlet cavity, which is communicated with the water inlet channel and the cooling cavity.

8. The engine according to claim 1, characterized in that The cylinder body includes a cylinder body, a cylinder liner and a water jacket. The cylinder body is provided with an inner cavity. The cylinder liner and the water jacket are both provided in the inner cavity. The water jacket is provided in the cylinder liner. The outer surface of the water jacket and the cavity wall of the inner cavity form the cooling cavity. The cooling cavity is provided around the circumference of the cylinder liner.

9. The engine according to any one of claims 1 to 8, characterized in that The installation cavity is arranged at a position of the cylinder body close to the water inlet of the cooling cavity.

10. A motorcycle, characterized in that: The invention comprises a motorcycle body and the engine according to any one of claims 1 to 9, wherein the engine is mounted on the motorcycle body.

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