Bottom shell structure, engine and motorcycle

Abstract

The present invention provides an oil pan structure, an engine, and a motorcycle. The top of the oil pan structure is provided with a receiving groove for receiving engine oil. The outer surface of the oil pan structure is provided with a recessed portion, which is recessed in a direction close to the receiving groove. The recessed portion is configured to cooperate with a pressure regulating valve limiter. When the oil pan structure in the present application is used, the oil pan structure is buckled onto a side of a lower case body close to the pressure regulating valve, so that the recessed portion can cooperate with one end of the pressure regulating valve limiter, thereby enabling the pressure regulating valve to be fixed between the lower case body and the recessed portion, thereby preventing the pressure regulating valve from falling off the lower case body, ensuring that the pressure regulating valve can stably and reliably limit and protect the oil pressure of the main oil channel of the engine's lubrication system, thereby improving the practicality of the oil pan structure and improving the stability and reliability of the operation of the engine and the motorcycle.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a bottom shell structure, an engine and a motorcycle. Background Art

[0002] The lubrication system is a crucial component of a motorcycle engine. Oil is drawn from the bottom of the oil pan by an oil pump, pressurized, and pumped through an inlet passage (oil channel) formed within the crankcase to the oil filter. After filtration, it flows to the various parts requiring lubrication. Simultaneously, the pressure regulating valve regulates and controls the oil pressure in the lubrication system's main oil channel, playing a crucial role in the smooth operation and reliability of the motorcycle engine. However, current engines often experience a tendency for the pressure regulating valve to fall off during use, resulting in low engine reliability. Summary of the Invention

[0003] Based on this, it is necessary to provide a bottom shell structure, an engine and a motorcycle to address the problem that the pressure regulating valve in the current engine is easy to fall off during use, resulting in low reliability of the engine.

[0004] The technical solution is as follows:

[0005] On the one hand, a bottom shell structure is provided, wherein a receiving groove is provided on the top of the bottom shell structure, and a recessed portion is provided on the outer surface of the bottom shell structure, wherein the recessed portion is recessed in a direction close to the receiving groove, and the recessed portion is used to cooperate with the pressure regulating valve limit.

[0006] The bottom shell structure in the above embodiment, when in use, is buckled onto the side of the lower housing near the pressure regulating valve, so that the recessed portion can cooperate with one end limit of the pressure regulating valve, thereby securing the pressure regulating valve between the lower housing and the recessed portion, preventing the pressure regulating valve from falling off the lower housing, and ensuring that the pressure regulating valve can stably and reliably limit and protect the oil pressure in the main oil channel of the engine's lubrication system, thereby improving the practicality of the bottom shell structure. In addition, the recessed portion is recessed toward the receiving tank to form a reinforcing rib structure. On the one hand, this increases the rigidity of the bottom shell structure, effectively preventing the bottom shell structure from being deformed or damaged by impacts from foreign objects such as sand and gravel, thereby improving the reliability of the bottom shell structure. On the other hand, it increases the heat dissipation area of ​​the bottom shell structure, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank through the bottom shell structure, thereby maintaining the oil temperature in the receiving tank within a preset range, ensuring stable and reliable operation of the engine.

[0007] The technical solution is further described below:

[0008] In one embodiment, a limiting portion is provided on a side of the recessed portion close to the accommodating groove, and the limiting portion is used to cooperate with the pressure regulating valve in a limiting manner along the axial direction of the pressure regulating valve.

[0009] In one embodiment, the bottom shell structure includes a first side wall and a bottom wall, and a horizontal distance between the first side wall and the bottom wall tends to increase from the bottom of the first side wall toward the top of the first side wall.

[0010] In one embodiment, the recessed portion is disposed on the first side wall, and the recessed portion extends from the bottom of the first side wall toward the top of the first side wall.

[0011] In one embodiment, a gripping portion is further provided on the outer surface of the bottom shell structure, and the gripping portion is used to receive a gripping force for gripping the bottom shell structure.

[0012] In one embodiment, there are at least two gripping portions, and each gripping portion is correspondingly disposed on a side wall on a different side of the bottom shell structure.

[0013] In one embodiment, the gripping portion is configured as a groove, and the groove extends from the bottom of the side wall of the bottom shell structure toward the top of the side wall of the bottom shell structure.

[0014] In one embodiment, the bottom shell structure further includes a bottom wall, and a connecting rib is provided on a side of the bottom wall away from the accommodating groove, and the connecting rib is correspondingly connected to the inner wall of each of the grooves.

[0015] On the other hand, an engine is provided, characterized in that it includes a lower box body, a pressure regulating valve and the bottom shell structure, the pressure regulating valve is arranged on the lower box body, and the bottom shell structure is arranged on the side of the lower box body close to the pressure regulating valve, so that the bottom shell structure can cooperate with the pressure regulating valve in a limited manner.

[0016] During assembly of the engine in the above embodiment, the lower housing is inverted, the pressure regulating valve is mounted on the lower housing, and the bottom housing structure is then buckled onto the side of the lower housing near the pressure regulating valve. This allows the pressure regulating valve to be fixed between the lower housing and the bottom housing structure, preventing the pressure regulating valve from falling off the lower housing. This ensures that the pressure regulating valve can stably and reliably limit and protect the oil pressure in the main oil channel of the engine's lubrication system, thereby improving the smoothness and reliability of engine operation. Furthermore, the recessed portion is recessed toward the receiving tank to form a reinforcing rib structure. This, on the one hand, increases the rigidity of the bottom housing structure, effectively preventing deformation or damage to the bottom housing structure due to impacts from foreign objects such as sand and gravel, thereby improving the reliability of the engine. On the other hand, it increases the heat dissipation area of ​​the bottom housing structure, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank through the bottom housing structure, thereby maintaining the oil temperature in the receiving tank within a preset range and ensuring stable and reliable operation of the engine.

[0017] On the other hand, a motorcycle is provided, characterized by comprising the engine.

[0018] During assembly of the motorcycle in the above embodiment, the lower housing is inverted, the pressure regulating valve is mounted on the lower housing, and the bottom housing structure is then buckled onto the side of the lower housing near the pressure regulating valve. This allows the pressure regulating valve to be secured between the lower housing and the bottom housing structure, preventing the pressure regulating valve from falling off the lower housing. This ensures that the pressure regulating valve can stably and reliably limit and protect the oil pressure in the main oil passage of the engine's lubrication system, thereby enabling the engine to provide stable and reliable driving force for the motorcycle, ensuring stable operation and reliability of the motorcycle. Furthermore, the recessed portion is recessed toward the receiving tank to form a reinforcing rib structure. This, on the one hand, increases the rigidity of the bottom housing structure, effectively preventing deformation or damage to the bottom housing structure due to impacts with foreign objects such as sand and gravel, thereby improving the reliability of the motorcycle. On the other hand, it increases the heat dissipation area of ​​the bottom housing structure, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank through the bottom housing structure, thereby maintaining the oil temperature in the receiving tank within a predetermined range, ensuring stable and reliable operation of the engine and improving the stability and reliability of the motorcycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Schematic diagram of the bottom shell structure of an embodiment.

[0022] Figure 2 for Figure 1 Schematic diagram of the bottom shell structure from another perspective.

[0023] Figure 3 for Figure 1 Schematic diagram of the structure after the bottom shell structure is assembled.

[0024] Description of reference numerals:

[0025] 100. Bottom shell structure; 110. Accommodating groove; 120. Recessed portion; 121. Limiting portion; 130. First side wall; 140. Bottom wall; 150. Windward side wall; 160. Leeward side wall; 170. Second side wall; 180. Gripping portion; 181. Groove; 190. Connecting rib; 200. Pressure regulating valve; 300. Lower box body. 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] In one embodiment, a motorcycle is provided, comprising an engine, wherein the engine can provide stable and reliable driving force for the motorcycle, thereby ensuring stable operation and reliability of the motorcycle.

[0028] like Figure 1 、 Figure 2 and Figure 3 As shown, in one embodiment, an engine is provided, comprising a lower case 300, a pressure regulating valve 200, and a bottom shell structure 100. The pressure regulating valve 200 is disposed on the lower case 300, and the bottom shell structure 100 is disposed on a side of the lower case 300 close to the pressure regulating valve 200, so that the bottom shell structure 100 can be limitedly engaged with the pressure regulating valve 200. Thus, when assembling the engine, the lower case 300 is inverted, the pressure regulating valve 200 is correspondingly mounted on the lower case 300, and then the bottom shell structure 100 is buckled onto the side of the lower case 300 close to the pressure regulating valve 200, so that the pressure regulating valve 200 can be fixed between the lower case 300 and the bottom shell structure 100, preventing the pressure regulating valve 200 from falling off the lower case 300, ensuring that the pressure regulating valve 200 can stably and reliably limit and protect the oil pressure in the main oil channel of the engine's lubrication system, and improving the smoothness and reliability of the engine operation.

[0029] The bottom shell structure 100 can be arranged on a side of the lower box body 300 close to the pressure regulating valve 200 by snap connection, screw connection, welding or other connection methods.

[0030] like Figure 1 、 Figure 2 and Figure 3As shown, in one embodiment, a bottom shell structure 100 is provided. A receiving groove 110 is provided on the top of the bottom shell structure 100, and the receiving groove 110 is used to receive engine oil. A recessed portion 120 is provided on the outer surface of the bottom shell structure 100, and the recessed portion 120 is recessed toward the receiving groove 110, and is used to limit the pressure regulating valve 200.

[0031] When the bottom shell structure 100 in the above embodiment is used, the bottom shell structure 100 is buckled onto the side of the lower box body 300 close to the pressure regulating valve 200, so that the recessed portion 120 can cooperate with the limit position of one end of the pressure regulating valve 200, and then the pressure regulating valve 200 can be fixed between the lower box body 300 and the recessed portion 120, thereby preventing the pressure regulating valve 200 from falling off from the lower box body 300, ensuring that the pressure regulating valve 200 can stably and reliably limit and protect the oil pressure of the main oil channel of the lubrication system of the engine, thereby improving the practicality of the bottom shell structure 100. In addition, the recessed portion 120 is recessed in the direction close to the receiving tank 110 to form a reinforcing rib structure. On the one hand, the rigidity of the bottom shell structure 100 is increased, effectively preventing the bottom shell structure 100 from being deformed or damaged by the impact of foreign objects such as sand and gravel, thereby improving the reliability of the bottom shell structure 100; on the other hand, the heat dissipation area of ​​the bottom shell structure 100 is increased, thereby increasing the efficiency of the oil in the receiving tank 110 to dissipate heat through the bottom shell structure 100, so that the oil temperature in the receiving tank 110 can be maintained within a preset range, ensuring that the engine can operate stably and reliably.

[0032] The outer surface of the bottom shell structure 100 refers to the surface of the bottom shell structure 100 that contacts the external atmospheric environment after being installed on the lower housing 300. The recessed portion 120 can be provided on a side wall of the bottom shell structure 100 or on the bottom wall 140 of the bottom shell structure 100. Specifically, in this embodiment, the recessed portion 120 is integrally formed with the bottom shell structure 100 by casting.

[0033] like Figure 1 and Figure 2 As shown, a limiting portion 121 is optionally provided on one side of the recessed portion 120 near the receiving groove 110. The limiting portion 121 is configured to limit the pressure regulating valve 200 along the axial direction of the pressure regulating valve 200. The outer contour of the limiting portion 121 matches the outer contour of the pressure regulating valve 200. This allows for surface contact between the pressure regulating valve 200 and the bottom shell structure 100, increasing the contact area between the pressure regulating valve 200 and the bottom shell structure 100, preventing the pressure regulating valve 200 from falling off the lower housing 300 and ensuring the stability and reliability of the pressure relief valve 200.

[0034] The limiting portion 121 may be a limiting boss, a limiting surface, or other limiting structure. Specifically, in this embodiment, the limiting portion 121 is configured as a limiting surface, which is located on the side of the recessed portion 120 near the pressure regulating valve 200. This facilitates the processing and manufacturing of the bottom shell structure 100.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the bottom shell structure 100 includes a first side wall 130 and a bottom wall 140. The horizontal spacing between the first side wall 130 and the bottom wall 140 increases from the bottom of the first side wall 130 toward the top of the first side wall 130. This increases the heat dissipation area of ​​the first side wall 130, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank 110 through the bottom shell structure 100. As a result, the oil temperature in the receiving tank 110 can be maintained within a preset range, ensuring stable and reliable engine operation.

[0036] The horizontal distance between the first sidewall 130 and the bottom wall 140 can increase linearly from the bottom of the first sidewall 130 toward the top of the first sidewall 130, for example, when the first sidewall 130 is configured as a flat surface. In other embodiments, the horizontal distance between the first sidewall 130 and the bottom wall 140 can increase nonlinearly from the bottom of the first sidewall 130 toward the top of the first sidewall 130, for example, when the first sidewall 130 is configured as a curved surface. Specifically, in this embodiment, the bottom shell structure 100 is generally conical.

[0037] The bottom of the first side wall 130 refers to a side of the first side wall 130 close to the bottom wall 140 ; ​​the top of the first bottom wall 140 refers to a side of the first side wall 130 away from the bottom wall 140 .

[0038] like Figure 1 and Figure 2 As shown, the recessed portion 120 is further provided on the first sidewall 130 and extends from the bottom of the first sidewall 130 toward the top of the first sidewall 130. As such, the side of the recessed portion 120 closer to the pressure regulating valve 200 experiences greater deformation, facilitating the provision of the stopper 121 there. Meanwhile, the side of the recessed portion 120 further from the pressure regulating valve 200 experiences less deformation, maintaining a greater rigidity for the first sidewall 130 and improving the reliability of the bottom shell structure 100.

[0039] like Figure 1 and Figure 2As shown, optionally, the bottom shell structure 100 further includes a windward sidewall 150, a leeward sidewall 160, and a second sidewall 170. The first sidewall 130, the windward sidewall 150, the leeward sidewall 160, and the second sidewall 170 are all located on the same side of the bottom wall 140. The first sidewall 130, the windward sidewall 150, the leeward sidewall 160, the second sidewall 170, and the bottom wall 140 enclose the receiving groove 110. Specifically, in this embodiment, the first sidewall 130, the bottom wall 140, the windward sidewall 150, the leeward sidewall 160, and the second sidewall 170 are an integrated structure. The horizontal distance between the windward sidewall 150 and the bottom wall 140 increases from the bottom of the windward sidewall 150 toward the top of the first sidewall 130; and / or the horizontal distance between the windward sidewall 150 and the bottom wall 140 increases from the bottom of the windward sidewall 150 toward the top of the first sidewall 130; and / or the horizontal distance between the windward sidewall 150 and the bottom wall 140 increases from the bottom of the windward sidewall 150 toward the top of the first sidewall 130. In this way, the heat dissipation area of ​​the bottom shell structure 100 is increased, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank 110 through the bottom shell structure 100, thereby maintaining the oil temperature in the receiving tank 110 within a preset range, ensuring stable and reliable operation of the engine.

[0040] In other embodiments, ribs are provided on the first side wall 130 , the windward side wall 150 , the leeward side wall 160 and / or the second side wall 170 , thereby further improving the rigidity and heat dissipation performance of the bottom shell structure 100 .

[0041] like Figure 1 and Figure 2 As shown, in one embodiment, the outer surface of the bottom shell structure 100 is further provided with a gripping portion 180, which is used to receive the gripping force of the bottom shell structure 100. Thus, due to the overall conical shape of the bottom shell structure 100, during installation, a user or a robot can grasp the bottom shell structure 100 via the gripping portion 180, thereby facilitating the buckling of the bottom shell structure 100 onto the side of the lower case 300 near the pressure regulating valve 200. This prevents the bottom shell structure 100 from being damaged due to falling during installation, thereby improving the assembly efficiency and reliability of the bottom shell structure 100.

[0042] The gripping portion 180 may be a gripping groove 181, a gripping protrusion, or other gripping structure. The gripping portion 180 may be disposed on a side of the bottom shell structure 100 away from the receiving slot 110, or on a side of the bottom wall 140 of the bottom shell structure 100 away from the receiving slot 110. The number of gripping portions 180 may be flexibly adjusted according to actual usage needs.

[0043] like Figure 1 and Figure 2 As shown, further, there are at least two gripping portions 180, each of which is correspondingly disposed on a sidewall of a different side of the bottom shell structure 100. In this way, a user or a robot can apply a gripping force to different sides of the bottom shell structure 100 through the gripping portions 180 to stably and reliably grip the bottom shell structure 100, thereby preventing the bottom shell structure 100 from falling during installation and improving the reliability of the assembly of the bottom shell structure 100.

[0044] like Figure 1 and Figure 2 As shown, in this embodiment, the first side wall 130, the leeward side wall 160 and the second side wall 170 are all provided with the gripping portion 180. Thus, the positional relationship of the three gripping portions 180 conforms to ergonomics, making it easier for a user or a robot to grip the bottom shell structure 100 during assembly.

[0045] like Figure 1 and Figure 2 As shown, optionally, the gripping portion 180 is configured as a groove 181, and the groove 181 extends from the bottom of the side wall of the bottom shell structure 100 toward the top of the side wall of the bottom shell structure 100. In this way, the outer dimensions of the bottom shell structure 100 are not increased, interference between the bottom shell structure 100 and other parts of the motorcycle is avoided, and the reliability and applicability of the bottom shell structure 100 are improved.

[0046] like Figure 1 As shown, the bottom shell structure 100 optionally further includes a bottom wall 140, one side of which is provided with a connecting rib 190, and the connecting rib 190 is correspondingly connected to the inner wall of each of the grooves 181. In this way, the connecting rib 190 and the inner wall of the groove 181 can be connected to form a whole. On the one hand, the rigidity of the bottom shell structure 100 is further increased, preventing the bottom shell structure 100 from being deformed or damaged by the impact of foreign objects such as sand and gravel, thereby improving the reliability of the bottom shell structure 100; on the other hand, the heat dissipation area of ​​the bottom shell structure 100 is further increased, thereby increasing the efficiency of heat dissipation of the oil in the receiving tank 110 through the bottom shell structure 100, ensuring that the oil temperature in the receiving tank 110 can be maintained within a preset range, thereby ensuring stable and reliable operation of the engine.

[0047] Specifically in this embodiment, the connecting ribs 190 include at least two transverse ribs and two longitudinal ribs. Adjacent transverse ribs are spaced apart, and each transverse rib intersects all longitudinal ribs. Adjacent longitudinal ribs are spaced apart, and each longitudinal rib intersects all transverse ribs. This allows the connecting ribs 190 to be evenly distributed across the bottom wall 140, further increasing the rigidity and heat dissipation area of ​​the bottom wall 140 and improving the reliability and heat dissipation performance of the bottom shell structure 100.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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. 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 embodiment.

[0053] It should also be understood that when explaining the connection relationship or positional relationship of elements, even if not explicitly described, the connection relationship and positional relationship should be interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately," "approximately," or "substantially" can mean within one or more standard deviations, which is not limited here.

[0054] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0055] The above embodiments merely illustrate 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, all of which 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. A bottom shell structure, applied to an engine, the engine comprising a lower box and a pressure regulating valve, characterized in that: The top of the bottom shell structure is provided with a receiving groove, and the outer surface of the bottom shell structure is provided with a recessed portion, the recessed portion is recessed in a direction close to the receiving groove, and the recessed portion is used to cooperate with the pressure regulating valve in a limiting manner; Wherein, a limiting portion is provided on one side of the recessed portion close to the accommodating groove, and the limiting portion is used to cooperate with the pressure regulating valve in a limiting manner along the axial direction of the pressure regulating valve; The bottom shell structure includes a first side wall and a bottom wall, wherein a horizontal distance between the first side wall and the bottom wall increases from the bottom of the first side wall toward the top of the first side wall; The bottom shell structure is arranged on a side of the lower box body close to the pressure regulating valve, so that the bottom shell structure can be limitedly matched with the pressure regulating valve.

2. The bottom shell structure according to claim 1, characterized in that: The recessed portion is disposed on the first side wall, and the recessed portion extends from the bottom of the first side wall toward the top of the first side wall.

3. The bottom shell structure according to claim 1 or 2, characterized in that: The outer surface of the bottom shell structure is further provided with a gripping portion, and the gripping portion is used to receive the gripping force of gripping the bottom shell structure.

4. The bottom shell structure according to claim 3, characterized in that: There are at least two gripping portions, and each gripping portion is correspondingly arranged on a side wall on a different side of the bottom shell structure.

5. The bottom shell structure according to claim 4, characterized in that: The gripping portion is configured as a groove, and the groove extends from the bottom of the side wall of the bottom shell structure toward the top of the side wall of the bottom shell structure.

6. The bottom shell structure according to claim 5, characterized in that: The bottom shell structure further includes a bottom wall. A connecting rib is provided on a side of the bottom wall away from the accommodating groove. The connecting rib is correspondingly connected to the inner wall of each of the grooves.

7. An engine, characterized in that: The invention comprises the bottom shell structure according to any one of claims 1 to 6.

8. A motorcycle, characterized in that: Comprising the engine of claim 7.

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