Crankcase, engine and motorcycle

Abstract

The utility model discloses a crankcase, engine and motorcycle belong to motorcycle technical field. Among them, the crankcase includes the box, and the box includes first half shell and second half shell, and the inboard of first half shell is equipped with first separation structure, and the inboard of second half shell is equipped with second separation structure, and first separation structure and second separation structure are connected with each other and define the separation chamber that oil gas mixture flows, and the surface of first half shell is equipped with the oil inlet of intercommunication separation chamber, and the bottom of first separation structure is equipped with the oil outlet of intercommunication inner chamber, and the oil inlet and oil outlet are along the height direction interval arrangement of box, and the separation chamber is equipped with a plurality of baffle in interval, and a plurality of baffle are configured as separating separation chamber into a plurality of separation cavities that intercommunicate, when oil gas mixture flows through oil inlet, at least partial separation chamber, oil outlet and inner chamber in proper order, and every baffle can adsorb the oil liquid in oil gas mixture. The utility model reduces that oil liquid discharges with oil gas mixture, and reduces the loss of oil.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle technology, and in particular to a crankcase, engine and motorcycle. Background Technology

[0002] In related technologies, when a motorcycle performs a gear shifting operation, such as acceleration or gear shifting, the gas pressure inside the crankcase increases sharply, forming an oil-gas mixture inside the crankcase. Since this oil-gas mixture contains a large amount of engine oil that should be recycled, this oil is discharged along with the mixture, causing continuous and unexpected loss of engine oil and affecting the lubrication of internal crankcase components. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a crankcase that can reduce the emission of engine oil with the oil-air mixture, significantly reducing unexpected oil loss.

[0004] This utility model also proposes an engine and a motorcycle that include the above-mentioned crankcase.

[0005] A crankcase according to a first aspect of the present invention includes: a housing, the housing including a first half-shell and a second half-shell disposed opposite to each other, the first half-shell and the second half-shell being interconnected and defining an inner cavity, a first separation structure being provided on the inner side of the first half-shell, a second separation structure corresponding to the first separation structure being provided on the inner side of the second half-shell, the first separation structure and the second separation structure being interconnected and defining a separation chamber for the flow of an oil-gas mixture, an oil inlet communicating with the separation chamber being provided on the surface of the first half-shell, an oil outlet communicating with the inner cavity being provided at the bottom of the first separation structure, the oil inlet and the oil outlet being spaced apart along the height direction of the housing, a plurality of baffles being spaced apart in the separation chamber, the plurality of baffles being configured to divide the separation chamber into a plurality of interconnected separation chambers; wherein, when the oil-gas mixture flows sequentially through the oil inlet, at least a portion of the separation chambers, the oil outlet and the inner cavity, each baffle is capable of adsorbing the oil in the oil-gas mixture.

[0006] The crankcase according to the embodiments of the present utility model has at least the following beneficial effects:

[0007] The crankcase of this utility model is interconnected by a first separation structure located inside the first half-shell and a second separation structure located inside the second half-shell, thereby defining a separation chamber for the flow of an oil-gas mixture. The surface of the first half-shell has an oil inlet communicating with the separation chamber, and the bottom of the first separation structure has an oil outlet communicating with the inner cavity. The oil inlet and outlet are spaced apart along the height of the crankcase, allowing the oil-gas mixture to flow sequentially through the oil inlet, at least part of the separation chamber, the oil outlet, and the inner cavity under gravity. Multiple baffles spaced apart within the separation chamber divide the separation chamber into multiple interconnected separation chambers, thereby extending the flow path of the oil-gas mixture and increasing the contact area with the baffles. During the flow of the oil-gas mixture, the baffles can absorb the oil in the mixture, separating it from the mixture and reducing the amount of oil discharged with the mixture. This significantly reduces unexpected oil loss, ensures sufficient oil in the crankcase cavity for lubrication of components, reduces wear on internal crankcase components, and extends the service life of the crankcase.

[0008] According to some embodiments of the present invention, the first half-shell includes a first bottom plate and a first side plate. The first side plate is disposed along the edge of the first bottom plate and protrudes from the first bottom plate toward the second half-shell. The first separation structure is formed between the inner wall of the first bottom plate and the inner peripheral wall of the first side plate. The second half-shell includes a second bottom plate and a second side plate. The second side plate is disposed along the edge of the second bottom plate and protrudes from the second bottom plate toward the first half-shell. The second side plate and the first side plate are connected to each other to form the inner cavity. The second separation structure is formed between the inner wall of the second bottom plate and the inner peripheral wall of the second side plate.

[0009] According to some embodiments of the present invention, the inner side of the first base plate is provided with a first surrounding plate, and the two ends of the first surrounding plate are respectively connected to the first side plate to form a first separation groove with the first side plate. The first base plate is provided with the oil inlet, and the first surrounding plate is provided with the oil outlet. The inner side of the second base plate is provided with a second surrounding plate, and the two ends of the second surrounding plate are respectively connected to the second side plate to form a second separation groove with the second side plate. The opening of the second separation groove and the opening of the first separation groove are arranged opposite to each other, and the second separation groove and the first separation groove are interconnected to form the separation chamber.

[0010] According to some embodiments of the present invention, the crankcase further includes a gasket, the gasket being disposed between the opening of the second separation groove and the opening of the first separation groove, the gasket being configured to cover the opening of the first separation groove to close the first separation groove, and to cover the opening of the second separation groove to close the second separation groove, the gasket having a plurality of openings communicating with the first separation groove and the second separation groove.

[0011] According to some embodiments of the present invention, the plurality of baffles include a plurality of first ribs spaced apart, the plurality of first ribs being disposed in the first separation groove and connected to the first bottom plate, and the first ribs being inclined downward from the oil inlet toward the oil outlet.

[0012] According to some embodiments of the present invention, the plurality of baffles further include a plurality of second ribs spaced apart. The plurality of second ribs are disposed in the second separation groove and connected to the second bottom plate. Some of the second ribs are arc-shaped, and other parts of the second ribs are straight.

[0013] According to some embodiments of the present invention, a guide plate is formed by protruding from the inner peripheral wall of the first side plate. The guide plate is inclined downward and located below the oil outlet. On the projection plane perpendicular to the height direction of the housing, the outer contour line of the projection of the oil outlet is located within the projection of the guide plate.

[0014] According to some embodiments of the present invention, the first base plate, the first side plate, the first surrounding plate, and the first rib plate are integrally formed;

[0015] And / or the second base plate, the second side plate, the second enclosure plate and the second rib plate are integrally formed.

[0016] An engine according to a second aspect embodiment of the present invention includes the crankcase described in the first aspect embodiment.

[0017] The engine according to the embodiments of the present invention has at least the following beneficial effects:

[0018] The engine of this embodiment adopts the crankcase of the first aspect embodiment. A first separation structure located inside the first half-shell and a second separation structure located inside the second half-shell are interconnected to define a separation chamber for the flow of an oil-gas mixture. The surface of the first half-shell has an oil inlet communicating with the separation chamber, and the bottom of the first separation structure has an oil outlet communicating with the inner cavity. The oil inlet and outlet are spaced apart along the height of the housing, allowing the oil-gas mixture to flow sequentially through the oil inlet, at least part of the separation chamber, the oil outlet, and the inner cavity under gravity. Multiple baffles spaced apart within the separation chamber divide the separation chamber into multiple interconnected separation chambers, thereby extending the flow path of the oil-gas mixture and increasing the contact area with the baffles. During the flow of the oil-gas mixture, the baffles can absorb the oil in the mixture, separating it from the mixture. This reduces the amount of oil discharged with the mixture, significantly reducing unexpected oil loss, ensuring sufficient oil in the engine for lubrication of components, reducing wear on engine parts, extending engine life, and improving engine stability and reliability.

[0019] The motorcycle according to a third aspect embodiment of the present invention includes the engine described in the second aspect embodiment.

[0020] The motorcycle according to the embodiments of the present utility model has at least the following beneficial effects:

[0021] The motorcycle of this utility model embodiment adopts the engine of the second aspect embodiment. By optimizing the structural design of the crankcase, the oil is separated from the oil-gas mixture, thereby reducing the discharge of oil with the oil-gas mixture, significantly reducing the unexpected loss of engine oil, ensuring that there is sufficient oil in the engine for lubrication of the components, reducing the wear of engine components, extending the service life of the motorcycle, improving the stability and reliability of the motorcycle, and improving the driver's driving experience.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the crankcase according to an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of a crankcase according to an embodiment of the present invention;

[0026] Figure 3This is a front view schematic diagram of the first half-shell according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the first half-shell according to an embodiment of the present invention;

[0028] Figure 5 This is a front view schematic diagram of the second half-shell according to an embodiment of the present invention.

[0029] Icon labels:

[0030] Crankcase 1000;

[0031] Box 400;

[0032] First half-shell 410; First separation structure 411; Oil inlet 412; Oil outlet 413; First bottom plate 414; First side plate 415; First enclosure plate 416; First separation groove 417; Guide plate 418;

[0033] Second half-shell 420; second separation structure 421; second bottom plate 422; second side plate 423; second surrounding plate 424; second separation groove 425;

[0034] Inner cavity 430;

[0035] Baffle 440; separation chamber 441; first rib 442; second rib 443. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] During motorcycle operation, especially during gear shifting operations such as acceleration or gear changes, drastic pressure changes occur inside the crankcase. These pressure fluctuations cause the formation of an oil-gas mixture containing a large amount of engine oil within the crankcase. Traditional crankcase designs lack effective oil-gas separation devices, allowing this oil-gas mixture to be directly discharged from the case. This results in continuous engine oil consumption, increased operating costs, and, more importantly, insufficient lubrication within the crankcase, affecting the normal operating performance and lifespan of various engine components.

[0041] To address the aforementioned problems, some embodiments of this utility model propose a crankcase 1000 suitable for motorcycle engines, which can reduce the emission of engine oil with the oil-air mixture, significantly reducing unexpected oil loss. See details below. Figures 1 to 5 The crankcase 1000 is described below.

[0042] Reference Figure 1 and Figure 2 As shown in this embodiment of the present invention, the crankcase 1000 includes a housing 400, which refers to a shell structure that houses components such as the crankshaft. The housing 400 is made of cast aluminum alloy and serves to support the internal mechanical structure and form a sealed space. Specifically, the housing 400 includes a first half-shell 410 and a second half-shell 420 disposed opposite to each other. The first half-shell 410 and the second half-shell 420 are arranged side-by-side and connected to each other to define an inner cavity 430.

[0043] Combination Figure 2 and Figure 3 It is understood that in this embodiment of the invention, the inner side of the first half-shell 410 is provided with a first separation structure 411, and the inner side of the second half-shell 420 is provided with a second separation structure 421 corresponding to the first separation structure 411. It should be noted that the inner side of the first half-shell 410 refers to the side of the first half-shell 410 facing the second half-shell 420, and the inner side of the second half-shell 420 refers to the side of the second half-shell 420 facing the first half-shell 410. When the first half-shell 410 and the second half-shell 420 are connected, the first separation structure 411 and the second separation structure 421 are interconnected and can define a separation chamber for the flow of the oil-gas mixture.

[0044] Reference Figure 1 and Figure 3As shown, in this embodiment of the present invention, the surface of the first half-shell 410 is provided with an oil inlet 412 communicating with the separation chamber, and the bottom of the first separation structure 411 is provided with an oil outlet 413 communicating with the inner cavity 430. Based on this, the oil inlet 412 and the oil outlet 413 are spaced apart along the height direction of the housing 400. Specifically, the oil inlet 412 is located above the oil outlet 413. Therefore, the oil-gas mixture flowing into the separation chamber from the oil inlet 412 can flow downward under the action of gravity until it flows out from the oil outlet 413.

[0045] Reference Figure 3 and Figure 4 As shown in this embodiment of the invention, a plurality of baffles 440 are spaced apart within the separation chamber, and these baffles 440 are configured to divide the separation chamber into a plurality of interconnected separation cavities 441. It is understood that the baffles 440 are arranged at intervals within the separation chamber, and the extending directions of the baffles 440 may be consistent or different. During the flow of the oil-gas mixture within the separation chamber under the influence of gravity, the oil-gas mixture will continuously collide with the same or different baffles 440, changing the flow direction of the oil-gas mixture.

[0046] It is understandable that, since the baffle 440 can adsorb the oil in the oil-gas mixture, when the oil-gas mixture flows sequentially through the oil inlet 412, at least part of the separation chamber 441, the oil outlet 413, and the inner chamber 430, the oil-gas mixture will collide with the baffle 440. At this time, the oil in the oil-gas mixture will separate out and adhere to the baffle 440, thereby achieving the separation of oil from the oil-gas mixture. In this embodiment, the oil-gas mixture flowing in the separation chamber may flow through only part of the separation chamber 441 or may flow through all of the separation chamber 441; this embodiment does not limit this. It should be noted that, in this embodiment, the oil may be engine oil.

[0047] The crankcase 1000 of this utility model embodiment is interconnected by a first separation structure 411 located inside the first half-shell 410 and a second separation structure 421 located inside the second half-shell 420, thereby defining a separation chamber for the flow of an oil-gas mixture. The surface of the first half-shell 410 is provided with an oil inlet 412 communicating with the separation chamber, and the bottom of the first separation structure 411 is provided with an oil outlet 413 communicating with the inner cavity 430. The oil inlet 412 and the oil outlet 413 are spaced apart along the height direction of the housing 400, so that the oil-gas mixture can flow sequentially through the oil inlet 412, at least part of the separation chamber 441, the oil outlet 413, and the inner cavity 430 under the action of gravity. 0; The separation chamber is divided into multiple interconnected separation chambers 441 by multiple baffles 440 spaced apart in the separation chamber, thereby extending the flow path of the oil-gas mixture and increasing the contact area with the baffles 440. During the flow of the oil-gas mixture, the baffles 440 can adsorb the oil in the oil-gas mixture, thereby separating the oil from the oil-gas mixture, thus reducing the discharge of oil with the oil-gas mixture, significantly reducing the unexpected loss of engine oil, ensuring that there is sufficient oil in the inner cavity 430 of the crankcase 1000 for the lubrication of the components, reducing the wear of the internal components of the crankcase 1000, and extending the service life of the crankcase 1000.

[0048] Reference Figure 3 and Figure 4 As shown, in this embodiment of the present invention, the first half-shell 410 includes a first base plate 414 and a first side plate 415. The first side plate 415 is disposed along the edge of the first base plate 414 and protrudes from the first base plate 414 toward the second half-shell 420. The first base plate 414 serves as a basic support surface, and the first side plate 415 serves as a vertically extending wall surface. The two are connected by welding or integral molding, thereby forming a recess on the inner side of the first half-shell 410. In this embodiment, a first separation structure 411 is disposed in the recess on the inner side of the first half-shell 410. Specifically, the first separation structure 411 is formed between the inner wall of the first base plate 414 and the inner peripheral wall of the first side plate 415.

[0049] Reference Figure 5As shown, in this embodiment of the present invention, the second half-shell 420 includes a second bottom plate 422 and a second side plate 423. The second side plate 423 is disposed along the edge of the second bottom plate 422 and protrudes from the second bottom plate 422 toward the first half-shell 410. The second bottom plate 422 serves as a basic support surface, and the second side plate 423 serves as a vertically extending wall surface. The two are connected by welding or integral molding, thereby forming a recess on the inner side of the second half-shell 420. In this embodiment, the first bottom plate 414 and the second bottom plate 422 are spaced apart, and the second side plate 423 and the first side plate 415 extend toward each other and are connected to each other, thereby enclosing and forming an inner cavity 430. The second separation structure 421 is disposed in the recess on the inner side of the second half-shell 420. Specifically, the second separation structure 421 is formed between the inner wall of the second bottom plate 422 and the inner peripheral wall of the second side plate 423.

[0050] Reference Figure 3 and Figure 4 As shown, in this embodiment of the present invention, a first surrounding plate 416 is provided on the inner side of the first base plate 414. The first surrounding plate 416 is perpendicular to the inner surface of the first base plate 414. Both ends of the first surrounding plate 416 along its length are connected to a first side plate 415, thereby forming a first separation groove 417. In this embodiment, an oil inlet 412 is located in the upper half of the first base plate 414, and an oil outlet 413 is located in the first surrounding plate 416. Specifically, the oil outlet 413 can penetrate the first surrounding plate 416, thereby connecting the separation chamber and the inner cavity 430.

[0051] Reference Figure 5 As shown in this embodiment of the invention, a second surrounding plate 424 is provided on the inner side of the second base plate 422. The second surrounding plate 424 is perpendicular to the inner surface of the second base plate 422. Both ends of the second surrounding plate 424 along its length are connected to a second side plate 423, thereby forming a second separation groove 425 with the second side plate 423. Figure 2 It is understood that the openings of the second separation groove 425 and the first separation groove 417 are arranged opposite to each other; in other words, the openings of the second separation groove 425 and the first separation groove 417 face each other. When the first half-shell 410 and the second half-shell 420 are connected, the first enclosure plate 416 and the second enclosure plate 424 are connected to allow the second separation groove 425 and the first separation groove 417 to communicate with each other. It is understood that in this embodiment, the separation chamber is composed of the interconnected first separation groove 417 and the second separation groove 425.

[0052] It is understood that in this embodiment of the present invention, the oil-gas mixture flows into the first separation tank 417 from the oil inlet 412. Part of it flows in the first separation tank 417 and continuously collides with the baffle 440 in the first separation tank 417, thereby achieving oil-gas separation, and finally flows into the inner cavity 430 from the oil outlet 413. The other part flows to the second separation tank 425 and continuously collides with the baffle 440 in the second separation tank 425, thereby achieving oil-gas separation, and then flows back to the first separation tank 417, and finally flows into the inner cavity 430 from the oil outlet 413.

[0053] In this embodiment of the invention, the crankcase 1000 further includes a gasket disposed between the opening of the second separation groove 425 and the opening of the first separation groove 417. The gasket is a sheet-like structure with a sealing function, and can be made of rubber or an elastic composite material. In this embodiment, the gasket is disposed between the opening of the first separation groove 417 and the opening of the second separation groove 425. Therefore, the gasket covers the opening of the first separation groove 417 to seal it, and simultaneously covers the opening of the second separation groove 425 to seal it.

[0054] In this embodiment of the invention, the gasket has multiple openings connecting the first separation groove 417 and the second separation groove 425. The gasket is used to maintain the connectivity between the first separation groove 417 and the second separation groove 425 while sealing the groove openings, allowing the oil-gas mixture to flow only through the openings. Specifically, the gasket is sandwiched between the openings of the first separation groove 417 and the second separation groove 425, and forms a tight contact with the edge of the groove openings through elastic deformation, thereby completely sealing the groove opening area. The distribution of the openings on the gasket corresponds to the layout of the baffles 440 in the separation grooves, so that after the oil-gas mixture enters from the first separation groove 417, it needs to pass through the adsorption effect of the baffle structure 440 before entering the second separation groove 425 through the openings for further separation.

[0055] Reference Figure 3 and Figure 4As shown in this embodiment of the invention, the multiple baffles 440 include multiple first ribs 442 spaced apart. The multiple first ribs 442 are disposed within the first separation groove 417 and connected to the first bottom plate 414. The first ribs 442 are inclined downwards from the oil inlet 412 towards the oil outlet 413. Specifically, the first ribs 442 protrude from the inner surface of the first bottom plate 414. It can be understood that the downward inclination means that the first ribs 442 form an angle with the horizontal plane, for example, a tilt angle range of 3° to 15°. On the one hand, the inclined first ribs 442, while adsorbing oil, can also drive the oil-gas mixture to flow faster, avoiding stagnation of the oil-gas mixture. On the other hand, under the combined acceleration of gravity and the inclined surface, the oil-gas mixture can increase its impact force on the first ribs 442, thereby strengthening the separation effect.

[0056] Reference Figure 5 As shown in this embodiment of the invention, the multiple baffles 440 further include multiple second ribs 443 spaced apart. These second ribs 443 are disposed within the second separation groove 425 and connected to the second base plate 422. Specifically, the second ribs 443 protrude from the inner surface of the second base plate 422. In this embodiment, some of the second ribs 443 are arc-shaped, while others are straight. The arc-shaped second ribs 443 refer to plates with curved profiles, which can be specifically achieved using arc-shaped stamping dies, used to guide the oil-gas mixture to generate swirling flow and extend the flow path. The straight-plate-shaped second ribs 443 refer to plates with straight profiles, which can be specifically achieved using straight-line stamping dies, used to form straight collision surfaces to increase the probability of inertial impact of oil droplets.

[0057] Reference Figure 3 and Figure 4 As shown in this embodiment of the invention, a guide plate 418 protrudes from the inner peripheral wall of the first side plate 415. The guide plate 418 is a plate-like structure extending from the inner wall of the first side plate 415. Specifically, it can be integrally processed with the side plate using a stamping process. In one example, its tilt angle can be in the range of 5-30 degrees. The guide plate 418 guides the flow direction of the oil through geometric constraints. In this embodiment, the guide plate 418 is inclined downward and located below the oil outlet 413. On the projection plane perpendicular to the height direction of the housing 400, the outer contour line of the projection of the oil outlet 413 is located within the projection of the guide plate 418. In other words, the projection area of ​​the guide plate 418 on the horizontal plane completely includes the opening area of ​​the oil outlet 413. Specifically, this can be achieved by adjusting the width of the guide plate 418 to be greater than the diameter of the oil outlet 413.

[0058] Understandably, when oil is discharged from the outlet 413, the inclined surface of the guide plate 418 forms a contact surface with the direction of oil flow, and the oil flows downward along the guide plate 418 under the action of gravity. Since the guide plate 418 completely covers the projected area of ​​the outlet 413, the oil is immediately confined within the guide channel formed by the guide plate 418 after leaving the outlet 413, avoiding splashing due to free fall or collision with other structures of the housing 400. The end of the guide plate 418 extends to the oil collection area of ​​the inner cavity 430, and the oil is directionally transported to the target location, such as the oil reservoir at the bottom of the crankcase 1000, through the inclined surface.

[0059] Reference Figure 1 and Figure 2 As shown, in this embodiment of the invention, the first base plate 414, the first side plate 415, the first enclosure plate 416, and the first rib plate 442 are integrally formed; and / or the second base plate 422, the second side plate 423, the second enclosure plate 424, and the second rib plate 443 are integrally formed. It is understood that integral forming refers to processing multiple components into a single structure at one time through casting or injection molding processes. Specifically, this can be achieved using metal die casting or plastic injection molding, thereby eliminating the connection gaps between components in traditional assembly processes. In this embodiment, the integral forming of the first base plate 414, the first side plate 415, the first enclosure plate 416, and the first rib plate 442, as well as the integral forming of the second base plate 422, the second side plate 423, the second enclosure plate 424, and the second rib plate 443, ensures that there are no seams or connection points between the components, reducing the risk of oil-gas mixture leakage.

[0060] An embodiment of this utility model also proposes an engine, including the crankcase 1000 of the above embodiment.

[0061] The engine of this embodiment uses the crankcase 1000 of the above embodiment. A first separation structure 411 located inside the first half-shell 410 and a second separation structure 421 located inside the second half-shell 420 are interconnected to define a separation chamber for the flow of an oil-gas mixture. The surface of the first half-shell 410 has an oil inlet 412 communicating with the separation chamber, and the bottom of the first separation structure 411 has an oil outlet 413 communicating with the inner cavity 430. The oil inlet 412 and the oil outlet 413 are spaced apart along the height direction of the housing 400, allowing the oil-gas mixture to flow sequentially through the oil inlet 412, at least part of the separation chamber 441, and the oil outlet under gravity. The engine has an opening 413 and an inner cavity 430. Multiple baffles 440 spaced apart within the separation chamber divide the separation chamber into multiple interconnected separation chambers 441, thereby extending the flow path of the oil-gas mixture and increasing the contact area with the baffles 440. During the flow of the oil-gas mixture, the baffles 440 can adsorb the oil in the mixture, thus separating the oil from the mixture. This reduces the amount of oil discharged with the mixture, significantly reducing unexpected oil loss, ensuring sufficient oil in the engine for lubrication of components, reducing wear on engine parts, extending engine life, and improving engine stability and reliability.

[0062] Since the engine adopts all the technical solutions of the crankcase 1000 of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0063] An embodiment of this utility model also provides a motorcycle, including the engine described in the above embodiment.

[0064] The motorcycle of this utility model embodiment uses the engine of the above embodiment. By optimizing the structural design of the crankcase 1000, the oil is separated from the oil-gas mixture, thereby reducing the discharge of oil with the oil-gas mixture, significantly reducing the unexpected loss of engine oil, ensuring that there is sufficient oil in the engine to lubricate the components, reducing the wear of engine components, extending the service life of the motorcycle, improving the stability and reliability of the motorcycle, and improving the driver's driving experience.

[0065] Since the motorcycle adopts all the technical solutions of the engine in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0066] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A crankcase, characterized in that, include: The housing includes a first half-shell and a second half-shell arranged opposite to each other. The first half-shell and the second half-shell are connected to each other and define an inner cavity. The inner side of the first half-shell is provided with a first separation structure, and the inner side of the second half-shell is provided with a second separation structure corresponding to the first separation structure. The first separation structure and the second separation structure are connected to each other and define a separation chamber for the flow of an oil-gas mixture. The surface of the first half-shell is provided with an oil inlet communicating with the separation chamber, and the bottom of the first separation structure is provided with an oil outlet communicating with the inner cavity. The oil inlet and the oil outlet are spaced apart along the height direction of the housing. Multiple baffles are spaced apart in the separation chamber, and the multiple baffles are configured to divide the separation chamber into multiple interconnected separation cavities. When the oil-gas mixture flows sequentially through the oil inlet, at least part of the separation chamber, the oil outlet, and the inner cavity, each baffle can adsorb the oil in the oil-gas mixture.

2. The crankcase according to claim 1, characterized in that, The first half-shell includes a first bottom plate and a first side plate. The first side plate is disposed along the edge of the first bottom plate and protrudes from the first bottom plate toward the second half-shell. The first separation structure is formed between the inner wall of the first bottom plate and the inner peripheral wall of the first side plate. The second half-shell includes a second bottom plate and a second side plate. The second side plate is disposed along the edge of the second bottom plate and protrudes from the second bottom plate toward the first half-shell. The second side plate and the first side plate are connected to each other to form the inner cavity. The second separation structure is formed between the inner wall of the second bottom plate and the inner peripheral wall of the second side plate.

3. The crankcase according to claim 2, characterized in that, The first base plate has a first enclosure plate on its inner side, and the two ends of the first enclosure plate are respectively connected to the first side plate to form a first separation groove with the first side plate. The first base plate has the oil inlet and the first enclosure plate has the oil outlet. The second base plate has a second enclosure plate on its inner side, and the two ends of the second enclosure plate are respectively connected to the second side plate to form a second separation groove with the second side plate. The opening of the second separation groove and the opening of the first separation groove are opposite to each other, and the second separation groove and the first separation groove are interconnected to form the separation chamber.

4. The crankcase according to claim 3, characterized in that, The crankcase also includes a gasket disposed between the opening of the second separation groove and the opening of the first separation groove. The gasket is configured to cover the opening of the first separation groove to close the first separation groove and to cover the opening of the second separation groove to close the second separation groove. The gasket has a plurality of openings communicating with the first separation groove and the second separation groove.

5. The crankcase according to claim 3, characterized in that, The baffles include a plurality of first ribs spaced apart, the plurality of first ribs being disposed in the first separation groove and connected to the first bottom plate, the first ribs being inclined downward from the oil inlet toward the oil outlet.

6. The crankcase according to claim 5, characterized in that, The baffles also include a plurality of second ribs spaced apart. The plurality of second ribs are disposed in the second separation groove and connected to the second bottom plate. Some of the second ribs are arc-shaped, and others are straight.

7. The crankcase according to claim 3, characterized in that, The inner peripheral wall of the first side plate protrudes to form a guide plate. The guide plate is inclined downward and located below the oil outlet. On the projection plane perpendicular to the height direction of the housing, the outer contour line of the projection of the oil outlet is located within the projection of the guide plate.

8. The crankcase according to claim 6, characterized in that, The first base plate, the first side plate, the first surrounding plate, and the first rib plate are integrally formed; And / or the second base plate, the second side plate, the second enclosure plate and the second rib plate are integrally formed.

9. An engine, characterized in that, Includes the crankcase as described in any one of claims 1 to 8.

10. A motorcycle, characterized in that, Includes the engine as described in claim 9.

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