Engine and motorcycle

Abstract

The application relates to an engine and a motorcycle. The engine comprises a box body, a box cover, a first sealing member and a second sealing member. The first sealing member is arranged between a first surrounding wall of the box body and a second surrounding wall of the box cover. Part of the structure of the first surrounding wall is exposed outside the first sealing member, and the second sealing member covers the part of the structure of the first surrounding wall exposed outside the first sealing member. The first sealing member and the second sealing member jointly form an oil-gas separation cavity together with the first surrounding wall, and a first baffle plate separates the oil-gas separation cavity into a first cavity and a second cavity. The first sealing member and the second surrounding wall jointly form an oil-gas passage, and the oil-gas passage is communicated with the first cavity and the second cavity through a ventilation hole of the first sealing member. The ventilation hole is arranged on the side of the first sealing member away from the second sealing member, and a side wall of the second cavity is provided with an exhaust port corresponding to the second sealing member. A receiving space is formed between the box cover and the second sealing member. The engine in the application can consider oil-gas separation and miniaturization design.

Description

Technical Field

[0001] This application relates to the field of motorcycle engine technology, and in particular to engines and motorcycles. Background Technology

[0002] Currently, the combustion process within the cylinder and the compression process during piston movement in a motorcycle engine produce a large amount of fuel-air mixture. To maintain stable air pressure within the engine, these exhaust gases must be expelled.

[0003] In related technologies, motorcycle engines mostly employ a labyrinth structure (such as a winding passageway) for oil-gas separation. Specifically, the labyrinth structure is located on the upper side of the engine crankcase, with corresponding oil-gas passages in both the crankcase and side covers. The oil-gas mixture, upon impact with the side walls of these passages, achieves oil-gas separation. This allows the oil in the oil-gas mixture passing through the labyrinth structure to be separated, flow back into the crankcase, and be recycled, preventing excessive oil consumption.

[0004] However, if the maze structure is too long, it will take up too much space, which will require increasing the lateral distance between the box and the cover to install other engine components such as the engine starter idler wheel. As a result, the engine size will be larger, which will easily increase the weight of the motorcycle and the difficulty of installation. On the other hand, if the maze structure is too short, it will affect the oil-gas separation effect. Summary of the Invention

[0005] Therefore, it is necessary to provide an engine and motorcycle that address the issue of how to reduce engine size while maintaining effective oil-gas separation.

[0006] According to a first aspect of this application, an engine is provided, comprising:

[0007] The box body has a first enclosure wall and a first baffle on its inner wall;

[0008] A box lid, wherein the inner wall of the box lid is provided with a second enclosure;

[0009] A first sealing element is sandwiched between the first enclosure wall and the second enclosure wall; a portion of the structure of the first enclosure wall is exposed outside the first sealing element, and the first sealing element is connected to one side of the first enclosure wall that is opposite to it along a first direction; the first direction is perpendicular to the thickness direction of the box body.

[0010] A second seal covers the portion of the first enclosure wall exposed from the first seal; the second seal is connected to the other side of the first enclosure wall disposed opposite to it along the first direction.

[0011] The first sealing element and the second sealing element together form an oil-gas separation chamber with the first enclosure wall. The first baffle is disposed in the oil-gas separation chamber and divides the oil-gas separation chamber into a first chamber and a second chamber. The first sealing element and the second enclosure wall form an oil-gas channel. The first sealing element is provided with a vent hole, and the oil-gas channel connects the first chamber and the second chamber through the vent hole.

[0012] Along the first direction, the distance between the vent hole and the side of the first seal that is away from the second seal is less than the distance between the vent hole and the side of the first seal that is close to the second seal; the sidewall of the second cavity is provided with an exhaust port corresponding to the second seal; along the thickness direction, the portion of the structure in the cover that corresponds to the second seal is spaced apart from the second seal to form a receiving space.

[0013] In one embodiment, the housing and the cover enclose an oil-gas mixing chamber, which is located on the side of the first chamber away from the second chamber and is connected to the first chamber; the engine also includes an ignition assembly, part of which is disposed within the receiving space, which is connected to the oil-gas mixing chamber.

[0014] In one embodiment, the hardness of the second seal is greater than the hardness of the first seal;

[0015] And / or, the engine further includes a connector and a mounting body, the mounting body being connected to the outer wall of the oil-gas separation chamber; one of the second seal and the mounting body is provided with a first insertion hole, and the other is connected to the connector, the connector being inserted into the first insertion hole.

[0016] In one embodiment, the second seal includes a plate and a first pad, the first pad covering a surface of the plate disposed along the thickness direction, the hardness of the first pad being less than the hardness of the plate; the plate abuts against the portion of the first enclosure exposed from the first seal via the first pad.

[0017] In one embodiment, the second seal includes a second pad, the first pad and the second pad respectively cover two opposite sides of the plate along its own thickness direction, and the hardness of the second pad is less than the hardness of the plate.

[0018] In one embodiment, at least one of the first enclosure and the first baffle has a recess in its top wall that is away from the box body along the thickness direction, and the second seal is disposed in the recess.

[0019] In one embodiment, the engine further includes a third seal connected to the first seal; and the third seal covers at least a portion of the second seal along the thickness direction.

[0020] And / or, the height of the side of the second seal that is away from the housing does not exceed the height of the side of the first enclosure that is away from the housing, which corresponds to the first seal.

[0021] In one embodiment, the inner wall of the cover is further provided with a second baffle, which divides the oil and gas passage into a third cavity and a fourth cavity. The inner wall of the cover is also provided with a notch, through which the third cavity communicates with the fourth cavity. The vent hole includes a first through hole and a second through hole, with the first cavity communicating with the third cavity through the first through hole and the second cavity communicating with the fourth cavity through the second through hole.

[0022] In one embodiment, the second baffle has a first end and a second end disposed opposite to each other along the first direction, the second end extending away from the first end in a direction away from the first cavity, such that at least a portion of the second baffle is disposed with an inclined structure.

[0023] And / or, at least one of the inner walls of the second baffle and the box cover is provided with a protrusion, and the oil-gas mixture in at least one of the third cavity and the fourth cavity can be separated into oil and gas through the protrusion.

[0024] According to a second aspect of this application, a motorcycle is provided, including the engine of the above-described embodiment.

[0025] In the aforementioned engine and motorcycle, the oil-gas mixture within the engine can be separated through an oil-gas separation path formed by the first chamber, the connecting hole, the oil-gas passage, the second chamber, and the exhaust port. This oil-gas separation path is relatively long, enabling a better oil-gas separation effect.

[0026] The vent is positioned closer to the first side edge. The exhaust port is located corresponding to the second seal. This means that when the oil-gas mixture enters the oil-gas channel, it needs to overcome significant resistance to move from the first seal towards the second seal. Therefore, even assuming no obstruction from the inner wall of the oil-gas channel, the actual flow space of the oil-gas mixture within the channel is largely confined to the area corresponding to the first seal. It then flows through the area corresponding to the first seal and the vent into the second chamber, without flowing excessively to the area corresponding to the second seal and returning to the vent to enter the second chamber. Therefore, it can be inferred that whether or not the cover forms an oil-gas channel in the area corresponding to the second seal does not significantly affect the oil-gas separation effect.

[0027] Based on this, in this embodiment, a portion of the structure of the first enclosure is exposed to the first seal, while the second seal covers the portion of the structure of the second enclosure exposed to the first seal. This allows the second seal to seal the portion of the first enclosure that is not sealed by the first seal, ensuring the sealing performance of the first cavity and the second cavity, and thus ensuring the length of the oil-gas separation path on the inner wall of the box.

[0028] Along the thickness direction, the part of the structure in the cover corresponding to the second seal forms a receiving space with the second seal. This allows the length of the oil-gas passage in the cover in the first direction to be less than the length of the first and second cavities in the first direction. The oil-gas passage does not need to be designed to be too long, thus compressing the space occupied by the oil-gas passage in the first direction. It also allows other engine components to be installed in the receiving space, improving the space utilization rate inside the engine. There is no need to add extra space to the engine to install other components, which is conducive to the miniaturization of the engine and can meet the requirements for the length of the oil-gas separation path, ensuring the oil-gas separation effect.

[0029] In addition, the first enclosure and the second enclosure can share the first seal, which helps to reduce the thickness of the housing and the cover after they are fitted together, and is beneficial to the miniaturization of the engine. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the first oil-gas separation channel structure in the housing of an engine, as shown in one embodiment.

[0031] Figure 2 This is a schematic diagram of the structure of the first and second seals in the engine and their sealing cooperation with the oil-gas separation chamber in one embodiment.

[0032] Figure 3 This is a schematic diagram of the oil and gas passage structure in the engine housing cover of one embodiment.

[0033] Figure 4 This is a schematic diagram of the structure in which the second seal of the engine and the oil-gas separation chamber are sealed together in one embodiment.

[0034] Figure 5 This is a side sectional view of the second seal in an engine shown in one embodiment.

[0035] Figure 6 This is a schematic diagram of a structure in an engine where a third seal covers a second seal, as shown in one embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Engine; 101. Gas-oil mixing chamber; 110. Housing; 110a. Top side; 110b. Recess; 1101. Gas-oil separation chamber; 1102. First chamber; 1103. Second chamber; 111. First enclosure wall; 112. First baffle; 120. Cover; 120a. Reception space; 120b. Notch; 120c. Protrusion; 1201. Gas-oil passage; 1202. Third chamber; 1203. Fourth chamber; 121. Second enclosure wall; 122. Second baffle; 1221. First end; 1222. Second end; 130, First seal; 1301, First side edge; 1302, Second side edge; 131, Vent; 1311, First through hole; 1312, Second through hole; 140, Second seal; 1401, Second insertion hole; 141, Plate; 142, First pad; 143, Second pad; 150, Exhaust pipe; 160, Ignition assembly; 170, Connector; 180, Mounting body; 1801, First insertion hole; 190, Third seal; X, Width direction; Y, Height direction; Z, Thickness direction. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In related technologies, to extend the oil-gas separation path, labyrinth structures are typically incorporated into both the crankcase and the crankcase cover. Correspondingly, to ensure the sealing performance of both labyrinth structures, they are designed to be mirror images of each other; that is, they are typically of equal length. Consequently, the labyrinth structure on the crankcase occupies space needed for other engine components, requiring a larger engine to accommodate them. This makes it difficult to simultaneously achieve effective oil-gas separation and engine miniaturization.

[0040] Based on this, one aspect of this application refers to... Figures 1 to 3 As shown, an engine 100 is provided, including a housing 110, a housing cover 120, a first seal 130, and a second seal 140.

[0041] The inner wall of the box 110 is provided with a first enclosure 111 and a first baffle 112, and the inner wall of the box cover 120 is provided with a second enclosure 121.

[0042] The first sealing element 130 is sandwiched between the first enclosure wall 111 and the second enclosure wall 121. A portion of the structure of the first enclosure wall 111 is exposed outside the first sealing element 130. The first sealing element 130 is connected to one side of the first enclosure wall 111 that is disposed opposite to it along a first direction. The first direction is perpendicular to the thickness direction Z of the housing 110.

[0043] The second seal 140 covers the portion of the first enclosure 111 exposed from the first seal 130. The second seal 140 is connected to the other side of the first enclosure 111, which is disposed opposite to it along a first direction.

[0044] The first sealing element 130 and the second sealing element 140 together enclose the first enclosure wall 111 to form an oil-gas separation chamber 1101. The first baffle 112 is disposed inside the oil-gas separation chamber 1101 and divides the oil-gas separation chamber 1101 into a first chamber 1102 and a second chamber 1103. The first sealing element 130 and the second enclosure wall 121 enclose an oil-gas passage 1201. The first sealing element 130 is provided with a vent hole, and the oil-gas passage 1201 connects the first chamber 1102 and the second chamber 1103 through the vent hole.

[0045] Along the first direction, the distance between the vent and the side of the first seal 130 away from the second seal 140 is less than the distance between the vent and the side of the first seal 130 close to the second seal 140. The sidewall of the second cavity 1103 has an exhaust port corresponding to the second seal 140. Along the thickness direction Z, the portion of the cover 120 corresponding to the second seal 140 forms a receiving space 120a with the second seal 140 at a distance.

[0046] For ease of understanding, the first sealing element 130 is provided with two opposite sides along the first direction, named the first side edge 1301 and the second side edge 1302. The first side edge 1301 is connected to one side of the first enclosure wall 111 that is opposite to it along the first direction, and the second side edge 1302 is connected to the other side of the second side edge 1302 that is opposite to it along the first direction. The first side edge 1301 is located away from the second sealing element 140, and the second side edge 1302 is located close to the second sealing element 140. The distance between the vent and the side of the first sealing element 130 that is away from the second sealing element 140 is less than the distance between the vent and the side of the first sealing element 130 that is close to the second sealing element 140, that is, the distance between the vent and the first side edge 1301 is less than the distance between the vent and the second side edge 1302. Therefore, the vent is located closer to the first side edge 1301.

[0047] Specifically, the oil-gas mixture within the engine 100 can be separated into oil and gas through an oil-gas separation path formed by the first chamber 1102, the connecting hole, the oil-gas passage 1201, the second chamber 1103, and the exhaust port. This oil-gas separation path is relatively long, enabling better oil-gas separation.

[0048] The vent is positioned closer to the first side edge 1301. The exhaust port is located corresponding to the second seal 140. This means that when the oil-gas mixture enters the oil-gas passage 1201, it needs to overcome significant resistance to move from the first seal 130 towards the second seal 140. Therefore, even assuming no obstruction from the inner wall of the oil-gas passage 1201, the flow space of the oil-gas mixture within the passage is mostly confined to the area corresponding to the first seal 130. It then flows through the area corresponding to the first seal 130 and the vent into the second chamber 1103, without flowing excessively to the area corresponding to the second seal 140 and returning to the vent to enter the second chamber 1103. Therefore, it can be inferred that whether or not the cover 120 forms an oil-gas passage 1201 in the area corresponding to the second seal 140 does not significantly affect the oil-gas separation effect.

[0049] Based on this, in this embodiment, a portion of the structure of the first enclosure 111 is exposed to the first seal 130, while the second seal 140 covers the portion of the structure of the second enclosure 121 exposed to the first seal 130. This allows the second seal 140 to seal the portion of the first enclosure 111 that is not sealed by the first seal 130, ensuring the sealing performance of the first cavity 1102 and the second cavity 1103, and thus ensuring the length of the oil-gas separation path on the inner wall of the housing 110.

[0050] Along the thickness direction Z, the portion of the structure in the cover 120 corresponding to the second seal 140 forms a receiving space 120a with the second seal 140. This allows the length of the oil-gas passage 1201 on the cover 120 in the first direction to be less than the lengths of the first cavity 1102 and the second cavity 1103 in the first direction. The oil-gas passage 1201 does not need to be designed to be too long, thus compressing the space occupied by the oil-gas passage 1201 in the first direction. Other components of the engine 100 can be installed in the receiving space 120a, improving the space utilization rate inside the engine 100. There is no need to add extra space to the engine 100 to install other components, which is conducive to the miniaturization of the engine 100 and can meet the oil-gas separation path length requirements, ensuring the oil-gas separation effect.

[0051] In addition, the first enclosure 111 and the second enclosure 121 can share the first seal 130, which helps to reduce the thickness of the housing 110 and the cover 120 after they are fitted together, and is beneficial to the miniaturization of the engine 100.

[0052] It should be noted that, taking the example of the exhaust port on the side wall of the second cavity 1103 corresponding to the second seal 140, for ease of description, the side wall of the second cavity 1103 is referred to as "Structure A". The area corresponding to B refers to the side wall area of ​​the second cavity 1103 when the second seal 140 covers the second cavity 1103. The structure corresponding to C refers to the exhaust port. The exhaust port is located closer to the area in the second cavity 1103 covered by the second seal 140, rather than the position in the second cavity 1103 covered by the first seal 130.

[0053] In the above embodiments, A is provided with a C corresponding to B, or C in A corresponding to B means that within the structure corresponding to A, the distance between the structure corresponding to C and the area corresponding to B is closer than the distance between the structure corresponding to C and the non-B area within the structure corresponding to A, and is closer to the B area.

[0054] In one example, the first direction is set in the same direction as the width direction X. In this way, the width space of the engine 100 can be reduced, and the housing space 120a is located in the width direction X, which facilitates the alignment and installation of other components of the engine 100.

[0055] In one embodiment, see back Figure 1 The housing 110 and the cover 120 enclose an oil-gas mixing chamber 101. The oil-gas mixing chamber 101 is located on the side of the first chamber 1102 away from the second chamber 1103, and the oil-gas mixing chamber 101 is connected to the first chamber 1102.

[0056] That is, the oil-gas mixing chamber 101, the first chamber 1102, and the second chamber 1103 are arranged in sequence. Since the oil-gas mixture in the oil-gas mixing chamber 101 has a lower density, it can enter the first chamber 1102, the oil-gas channel 1201, and the second chamber 1103 in sequence from the oil-gas mixing chamber 101 for oil-gas separation. The separated oil can flow back to the oil-gas mixing chamber 101 under the action of gravity, and the gas can be discharged through the exhaust port due to its lower density, thus realizing oil-gas separation and oil recovery.

[0057] Furthermore, by utilizing the density difference between oil and gas, oil-gas separation and oil recovery can be achieved through physical dispersion and diversion, eliminating the need for additional flow guiding structures. This reduces design complexity and avoids the space occupied by additional flow guiding structures in the engine 100, thus ensuring the miniaturization of the engine 100.

[0058] Furthermore, in one embodiment, see back Figure 3 The engine 100 also includes an ignition assembly 160, a portion of which is disposed within a receiving space 120a. The receiving space 120a is connected to the oil-gas mixing chamber 101.

[0059] Thus, on the one hand, the ignition assembly 160 does not occupy additional space outside the housing 110 or the cover 120 independently, but is built into the original receiving space 120a. Moreover, the receiving space 120a has partially overlapped with the oil-gas separation chamber 1101 in the thickness direction Z. Therefore, the introduction of the ignition assembly 160 will not cause an increase in the dimensions of the engine 100 in the first direction (such as the width and height), which is conducive to maintaining the miniaturization of the engine 100.

[0060] Furthermore, the containment space 120a is connected to the oil-gas mixing chamber 101, so that the ignition end of the ignition assembly 160 can get closer to the mixture in the oil-gas mixing chamber 101, reducing the loss of ignition energy during the transmission process and improving ignition reliability and combustion response speed.

[0061] In addition, in one example, see back Figure 1 One end of the first enclosure 111 is connected to the top side 110a of the housing 110 along the height direction Y, and the first cavity and the oil-gas mixing cavity 101 are arranged sequentially along the height direction Y of the housing. The oil-gas passage 1201 is connected to the top side 110a of the housing cover 120 along the height direction Y, and is arranged sequentially with the oil-gas mixing cavity 101 along the height direction Y.

[0062] This facilitates the return of oil to the oil-gas mixing chamber 101 under the influence of gravity when the oil-gas mixture flows in the oil-gas separation chamber 1101 and the oil-gas channel 1201, thereby improving the efficiency of oil-gas separation.

[0063] In another example, such as Figure 1 as well as Figure 2 As shown, the engine 100 also includes an exhaust pipe 150, which is connected to the exhaust port. Thus, centralized exhaust can be achieved through the exhaust pipe 150, which helps improve exhaust efficiency.

[0064] In one embodiment, the first seal 130 and the second seal 140 are integrally formed. This reduces the number of manufacturing steps for the first seal 130 and the second seal 140, and improves processing efficiency.

[0065] In other embodiments, the hardness of the second seal is greater than that of the first seal. Thus, since the second seal 140, sealed within the receiving space 120a, does not have a second enclosure 121 abutting against it, the sealing stability of the second seal 140 within the receiving space 120a is poor, and separation of the second seal 140 from the first enclosure 111 is likely, which is detrimental to achieving stable oil-gas separation.

[0066] In this embodiment, the harder second sealing element 140 can provide better support strength for the oil-gas separation chamber 1101 corresponding to the receiving space 120a, thereby providing a stable sealing effect. The first sealing element 130, because it can be clamped by the first enclosure wall 111 and the second enclosure wall 121, has relatively high installation stability. Therefore, its hardness can be made relatively low to reduce processing costs, while still ensuring a sealing effect against the first enclosure wall 111 and the second enclosure wall 121.

[0067] To improve the enclosure stability of the second seal 140 and the first enclosure wall 111, in some embodiments, such as Figure 4 As shown, the engine 100 also includes a connector 170 and a mounting body 180. The mounting body 180 is connected to the outer wall of the oil-gas separation chamber 1101. One of the second seal 140 and the mounting body 180 is provided with a first insertion hole 1801, and the other is connected to the connector 170. The connector 170 is inserted into the first insertion hole 1801.

[0068] Thus, through the insertion and engagement of the connector 170 with the first insertion hole 1801, the second seal 140 and the mounting body 180 are engaged, enabling axial positioning of the second seal 140 relative to the mounting body 180, thereby improving the stability of the enclosure fit between the second seal 140 and the first enclosure wall 111. Furthermore, the mounting body 180 is connected to the outer wall of the oil-gas separation chamber 1101, ensuring that it does not interfere with the space within the chamber and guaranteeing smooth oil-gas flow, which is beneficial for improving oil-gas separation efficiency. Simultaneously, the connection between the mounting body 180 and the outer wall of the oil-gas separation chamber 1101 avoids the increased size of the engine 100 that would occur if the mounting body 180 and the outer wall of the oil-gas separation chamber 1101 were spaced apart, thus contributing to the miniaturization of the engine 100.

[0069] Furthermore, in an installation scenario, combined with Figure 1 , Figure 4 as well as Figure 5 As shown, the mounting body 180 has a first insertion hole 1801, the second sealing member 140 has a second insertion hole 1401, and the connector 170 is inserted into the first insertion hole 1801 and the second insertion hole 1401. This reduces the connection process between the connector 170 and the second sealing member 140; it only requires aligning the first insertion hole 1801 and the second insertion hole 1401 before inserting the connector 170, which helps reduce processing difficulty and improve processing efficiency.

[0070] In another installation scenario, one of the inner walls of the connector 170 and the first socket 1801 has an external thread structure, and the other has an internal thread structure. The external thread structure and the internal thread structure are screwed together. That is, the connector 170 can be inserted into and screwed into the first socket 1801. The screwed structure can achieve a self-locking effect between the connector 170 and the first socket 1801, improving the stability of the enclosure fit between the second seal 140 and the first enclosure wall 111.

[0071] In conjunction with any embodiment of the second seal 140 described above, such as Figure 5 As shown, the second seal 140 includes a plate 141 and a first pad 142. The first pad 142 covers one side of the plate 141 disposed along its thickness direction Z. The plate 141 abuts against the portion of the first enclosure 111 exposed from the first seal 130 via the first pad 142.

[0072] In this way, the first pad 142 can adapt to the gap between the surface of the plate 141 and the first enclosure wall 111, ensuring the sealing performance between the second seal 140 and the first enclosure wall 111. Furthermore, the hardness of the first pad 142 is less than that of the plate 141, which can provide sufficient support strength for the second seal 140 through the plate 141, thereby ensuring good sealing contact performance between the second seal 140 and the first enclosure wall 111, and improving the sealing stability of the oil-gas separation chamber 1101 corresponding to the receiving space 120a.

[0073] Alternatively, in one embodiment, see back Figure 5 The second sealing element 140 includes a second gasket 143. The first gasket 142 and the second gasket 143 respectively cover the two opposite sides of the plate 141 along its thickness direction Z. The hardness of the second gasket 143 is less than that of the plate 141. Thus, when other components of the engine 100, such as the ignition assembly 160, are installed in the receiving space 120a, the second gasket 143 can provide a certain buffering performance for the first enclosure wall 111 and the plate 141, thereby ensuring the degree of enclosure and fit of the plate 141 and the first gasket 142 against the first enclosure wall 111, and ensuring the sealing stability of the oil-gas separation chamber 1101 corresponding to the receiving space 120a.

[0074] In one example, see back Figure 5 The first pad 142 and the second pad 143 are integrally formed and both can cover the side of the plate 141. In this way, the plate 141 can be fully wrapped, which can increase the peripheral contact area between the second seal 140 and the first enclosure 111, thereby improving the sealing stability.

[0075] In conjunction with any embodiment of the second seal 140 described above, such as Figure 1 as well as Figure 4 As shown, at least one of the first enclosure wall 111 and the first baffle 112 has a recess 110b on its top wall facing away from the box body 110 along the thickness direction Z, and the second sealing member 140 is disposed in the recess 110b.

[0076] Understandably, the recess 110b provides a receiving and positioning effect for the second seal 140, so that the position of the second seal 140 along the thickness direction Z and the width direction X is constrained during assembly and operation, preventing the second seal 140 from dislodging from the groove surface of the first enclosure due to pressure fluctuations, vibration or thermal deformation, thus ensuring the sealing stability of the second seal 140 to the first enclosure.

[0077] Furthermore, the recess 110b reduces the distance by which the second seal 140 protrudes from the top wall of the first enclosure, thereby reducing the thickness of the engine 100 and facilitating its miniaturization.

[0078] Alternatively, in one embodiment, such as Figure 2 and Figure 4 As shown, the second sealing member 140 is disposed in the recess 110b, such that the height of the side of the second sealing member 140 facing away from the housing 110 does not exceed the height of the side of the first enclosure 111 corresponding to the first sealing member 130 facing away from the housing 110.

[0079] Thus, the height of the side of the second seal 140 facing away from the housing 110 does not exceed the height of the side of the first enclosure 111 facing away from the housing 110, which corresponds to the first seal 130. This ensures that the second seal 140 does not protrude beyond the edge of the area corresponding to the first seal 130 in the first enclosure 111, thus not obstructing the installation of the first seal 130. Consequently, it prevents the first seal 130 from separating from the enclosure of the first enclosure 111 and the second enclosure 121, ensuring the enclosure stability between the oil-gas separation chamber 1101 and the first enclosure 111.

[0080] In one example, the side of the second seal 140 facing away from the housing 110 is coplanar with the side of the first enclosure 111 facing away from the housing 110, corresponding to the first seal 130.

[0081] In this way, when the second seal 140 is placed in the recess 110b, it can still be ensured that the surface of the first enclosure 111 corresponding to the first seal 130 is flush with the second seal 140, and there will be no unevenness, which facilitates the closing and installation of the cover 120 and the box body 110.

[0082] In yet another embodiment, such as Figure 6 As shown, the engine 100 also includes a third seal 190, which is connected to the first seal 130. Along the thickness direction Z, the third seal 190 covers at least a portion of the second seal 140. This arrangement of the third seal 190 facilitates the application of force to the first seal 130 by a technician to adjust its position, reducing the difficulty of installing the first seal 130 and improving its installation accuracy.

[0083] In one example, the third seal 190 is connected to the second side edge 1302. The third seal 190 covers the surface of the second seal 140 that faces away from the first enclosure wall 111. Thus, the third seal 190 covers the connection gap between the first seal 130 and the second seal 140, thereby strengthening the seal between them and preventing the oil-gas mixture in the oil-gas separation chamber 1101 from escaping through the gap between the first seal 130 and the second seal 140, thus improving the reliability of oil-gas separation.

[0084] Furthermore, in one embodiment, the height of the side of the second seal 140 facing away from the housing 110 does not exceed the height of the side of the first enclosure 111 facing away from the housing 110 corresponding to the first seal 130, so that the third seal 190 does not occupy too much space in the receiving space 120a in the thickness direction Z, thereby providing a more spacious receiving space 120a for other components of the engine 100.

[0085] This improves the sealing effect of the first sealing element 130 on the first enclosure wall 111 and the contact effect with the second sealing element 140, thereby improving the stability and reliability of oil-gas separation.

[0086] In another example, the first seal 130 and the third seal 190 are integrally formed. This helps to reduce processing steps and thus improve processing efficiency.

[0087] In one embodiment, the first seal 130 includes a flexible pad. This provides an elastic sealing fit space between the first enclosure 111 and the second enclosure 121, allowing for adaptive deformation adjustment based on the gap between the surfaces of the first enclosure 111 and the second enclosure 121. This ensures that the flexible pad remains in contact with the surfaces of the first and second enclosures, improving the sealing performance of the first seal 130 between the first and second enclosures 121.

[0088] In another embodiment, the first seal 130 includes sealing oil paper. Thus, the sealing oil paper has a relatively low installation cost, is easy to replace, and helps reduce costs; at the same time, the sealing oil paper is thinner, which helps reduce the thickness of the engine 100.

[0089] In any embodiment of the oil-gas separation chamber 1101 and oil-gas passage 1201 described above, the inner wall of the cover 120 is further provided with a second baffle 122, which divides the oil-gas passage 1201 into a third chamber 1202 and a fourth chamber 1203. The inner wall of the cover 120 is also provided with a notch 120b, through which the third chamber 1202 communicates with the fourth chamber 1203. The vent 131 includes a first through hole 1311 and a second through hole 1312. The first chamber 1102 communicates with the third chamber 1202 through the first through hole 1311. The fourth chamber 1203 communicates with the second chamber 1103 through the second through hole 1312. That is, the oil-gas mixture has an oil-gas separation path consisting of a first cavity 1102, a first through hole 1311, a third cavity 1202, a fourth cavity 1203, a second through hole 1312, and a second cavity 1103. By extending the oil-gas separation path, it is beneficial to improve the oil-gas separation effect.

[0090] Furthermore, in one example, one end of the second baffle 122 is spaced apart from the side wall of the cover 120 to form a notch 120b. This arrangement, with the notch 120b positioned close to the vent 131, allows the oil-gas mixture to be fully dispersed, heat-exchanged, and impacted in the area of ​​the oil-gas passage 1201 near the first side edge 1301, thereby achieving oil-gas separation. Simultaneously, it improves the dispersion efficiency of the oil-gas mixture in the third chamber 1202 to the fourth chamber 1203, thus contributing to the oil-gas separation efficiency.

[0091] Alternatively, in other examples, the notch 120b is located on the second baffle 122, or in other locations, without much restriction here.

[0092] In one embodiment, the second baffle 122 has a first end 1221 and a second end 1222 disposed opposite to each other along a first direction. The second end 1222 extends away from the first cavity 1102 relative to the first end 1221, such that at least a portion of the second baffle 122 is configured with an inclined structure. Thus, when the oil-gas mixture enters the third cavity 1202 and the fourth cavity 1203, it needs to pass through the inclined structure, thereby increasing the contact area between the oil-gas mixture and the inclined structure, and thus improving the oil-gas separation effect.

[0093] In another embodiment, at least one of the inner sidewalls of the second baffle 122 and the cover 120 is provided with a protrusion 120c, and the oil-gas mixture in at least one of the third cavity 1202 and the fourth cavity 1203 can be separated into oil and gas through the protrusion 120c. In this way, the protrusion 120c can block the escape of the oil-gas mixture, slow down the escape rate of the oil-gas mixture, and thus enable the oil-gas mixture to fully collide and exchange heat with the protrusion 120c, the sidewall of the third cavity 1202 and the sidewall of the fourth cavity 1203, so as to achieve sufficient oil-gas separation.

[0094] In another aspect of this application, a motorcycle is provided, including the engine 100 of any of the above embodiments.

[0095] Thus, by setting up the engine 100 as described above, the space occupied by the oil-gas passage 1201 in the first direction is compressed, thereby creating more space to install other components of the engine 100, improving the space utilization rate within the engine 100, which is beneficial for the miniaturization of the engine 100; at the same time, the effect of oil-gas separation is also taken into account.

[0096] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "lateral", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0097] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0099] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0100] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0102] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An engine, characterized in that, include: The box body has a first enclosure wall and a first baffle on its inner wall; A box lid, wherein the inner wall of the box lid is provided with a second enclosure; A first sealing element is sandwiched between the first enclosure wall and the second enclosure wall; a portion of the structure of the first enclosure wall is exposed outside the first sealing element, and the first sealing element is connected to one side of the first enclosure wall that is opposite to it along a first direction; the first direction is perpendicular to the thickness direction of the box body. A second seal covers the portion of the first enclosure wall exposed from the first seal; the second seal is connected to the other side of the first enclosure wall disposed opposite to it along the first direction. The first sealing element and the second sealing element together form an oil-gas separation chamber with the first enclosure wall. The first baffle is disposed in the oil-gas separation chamber and divides the oil-gas separation chamber into a first chamber and a second chamber. The first sealing element and the second enclosure wall form an oil-gas channel. The first sealing element is provided with a vent hole, and the oil-gas channel connects the first chamber and the second chamber through the vent hole. Along the first direction, the distance between the vent hole and the side of the first seal that is away from the second seal is less than the distance between the vent hole and the side of the first seal that is close to the second seal; the sidewall of the second cavity is provided with an exhaust port corresponding to the second seal; Along the thickness direction, a portion of the structure in the cover corresponding to the second seal is spaced apart from the second seal to form a receiving space.

2. The engine according to claim 1, characterized in that, The housing and the cover enclose an oil-gas mixing chamber, which is located on the side of the first chamber away from the second chamber and is connected to the first chamber. The engine also includes an ignition assembly, part of which is disposed within the receiving space, which is connected to the oil-gas mixing chamber.

3. The engine according to claim 1, characterized in that, The hardness of the second seal is greater than that of the first seal; And / or, the engine further includes a connector and a mounting body, the mounting body being connected to the outer wall of the oil-gas separation chamber; one of the second seal and the mounting body is provided with a first insertion hole, and the other is connected to the connector, the connector being inserted into the first insertion hole.

4. The engine according to claim 1, characterized in that, The second sealing element includes a plate and a first pad, the first pad covering a surface of the plate disposed along the thickness direction, the hardness of the first pad being less than the hardness of the plate; the plate abuts against the portion of the first enclosure exposed from the first sealing element through the first pad.

5. The engine according to claim 4, characterized in that, The second sealing element includes a second gasket layer. The first gasket layer and the second gasket layer respectively cover two opposite sides of the plate body along its own thickness direction. The hardness of the second gasket layer is less than the hardness of the plate body.

6. The engine according to claim 1, characterized in that, At least one of the first enclosure wall and the first baffle has a recessed portion on its top wall that is away from the box body along the thickness direction, and the second sealing member is disposed in the recessed portion.

7. The engine according to claim 6, characterized in that, The engine further includes a third seal connected to the first seal; and along the thickness direction, the third seal covers at least a portion of the second seal. And / or, the height of the side of the second seal that is away from the housing does not exceed the height of the side of the first enclosure that is away from the housing, which corresponds to the first seal.

8. The engine according to claim 1, characterized in that, The inner wall of the box cover is also provided with a second baffle, which divides the oil and gas passage into a third cavity and a fourth cavity. The inner wall of the box cover is also provided with a notch, through which the third cavity communicates with the fourth cavity. The vent hole includes a first through hole and a second through hole, through which the first cavity communicates with the third cavity and the second cavity communicates with the fourth cavity.

9. The engine according to claim 8, characterized in that, The second baffle has a first end and a second end disposed opposite to each other along the first direction, the second end extending away from the first end in a direction away from the first cavity, such that at least a portion of the second baffle is disposed with an inclined structure; And / or, at least one of the inner walls of the second baffle and the box cover is provided with a protrusion, and the oil-gas mixture in at least one of the third cavity and the fourth cavity can be separated into oil and gas through the protrusion.

10. A motorcycle, characterized in that, Includes the engine as described in any one of claims 1 to 9.

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