Cylinder head cover and engine

Abstract

The utility model relates to a cylinder head cover and an engine. The cylinder head cover comprises a cover body and an oil-gas separation mechanism. The oil-gas separation mechanism is arranged on the side, located in the crankcase, of the cover body and provided with a separation cavity, a first gas inlet, a second gas inlet and a third gas inlet, one end of the separation cavity is connected with an exhaust part, and the first gas inlet is formed in the end, away from the exhaust part, of the separation cavity. The second air inlet and the third air inlet are both arranged between the exhaust part and the first air inlet in a spaced mode, and the second air inlet and the third air inlet are located in the two opposite sides of the first air inlet correspondingly. By arranging the three air inlets and reasonably arranging the three air inlets, gas to be separated can enter the separation cavity through the other air inlets under the condition that a vehicle inclines to enable part of the air inlets to be immersed by engine oil, so that large engine oil and waste gas in the gas are smoothly separated, and the separation efficiency is improved. And a large amount of separated engine oil is effectively prevented from flowing into the air filter under the influence of air pressure, so that the air filter is protected.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a cylinder head cover and an engine. Background Art

[0002] In the engine of a scooter model, the cylinder head is installed on the crankcase. An oil-gas separation component is provided on the cylinder head, and the oil-gas separation component is connected to the exhaust pipe. When the exhaust gas passes through the maze of the oil-gas separation component, the engine oil in the exhaust gas will remain on the inner wall of the maze structure, and then the engine oil will be separated in the exhaust. The separated exhaust gas is then introduced into the engine through the exhaust pipe through the air filter for combustion.

[0003] In the related art, when the vehicle tilts (for example, to the left or right) while the engine is running, the residual oil in the cylinder head will submerge the air intake. Under the action of air pressure, a large amount of oil enters the air filter from the exhaust pipe, which can easily cause damage to the air filter. Utility Model Content

[0004] Based on this, a cylinder head cover and an engine are provided, which can prevent engine oil from entering the air filter to protect the air filter.

[0005] In one aspect, a cylinder head cover comprises:

[0006] A cover body, used for covering the crankcase of the engine;

[0007] An oil-gas separation mechanism is arranged on a side of the cover body located inside the crankcase, and the oil-gas separation mechanism is provided with a separation chamber, a first air inlet, a second air inlet and a third air inlet. The first air inlet, the second air inlet and the third air inlet are all connected to the interior of the separation chamber, one end of the separation chamber is connected to an exhaust piece, the first air inlet is arranged at an end of the separation chamber away from the exhaust piece, the second air inlet and the third air inlet are both spaced apart between the exhaust piece and the first air inlet, and the second air inlet and the third air inlet are respectively located on opposite sides of the first air inlet, and the exhaust piece is used to discharge the separated exhaust gas to the outside of the cover body.

[0008] In one embodiment, a first flow channel, a second flow channel, and a third flow channel are provided in the separation chamber, one end of the second flow channel and one end of the third flow channel are connected to one end of the first flow channel, the exhaust member is provided in the first flow channel, the second flow channel and the third flow channel are spaced apart, and the first air inlet and the second air inlet are both provided on the second flow channel, and the third air inlet is provided on the third flow channel;

[0009] The oil-gas separation mechanism includes a blocking component arranged inside the second flow channel, and the blocking component is located between the second air inlet and the first flow channel, the blocking component includes a first blocking rib, a second blocking rib and a third blocking rib, the first blocking rib, the second blocking rib and the third blocking rib are respectively distributed in sequence and at intervals along the direction of the first flow channel toward the second air inlet, one end of the first blocking rib and one end of the third blocking rib are both connected to the side wall of the second flow channel close to the third flow channel, the other end of the first blocking rib and the other end of the third blocking rib are both spaced from the side wall of the second flow channel away from the third flow channel, one end of the second blocking rib is connected to the side wall of the second flow channel away from the third flow channel, and the other end of the second blocking rib is spaced from the side wall of the second flow channel close to the third flow channel.

[0010] In one embodiment, the second air inlet is provided on a side wall of the second flow channel facing away from the third flow channel, and the second air inlet is an arc-shaped structure.

[0011] In one embodiment, the exhaust member is disposed at an end of the first flow channel away from the second flow channel.

[0012] In one embodiment, a reinforcing rib is provided at a position where the second retaining rib is connected to the inner side wall of the second flow channel, and an end of the reinforcing rib away from the second retaining rib extends toward the inside of the second flow channel.

[0013] In one embodiment, a fourth flow channel is further provided between the third flow channel and the second flow channel, and the fourth flow channel is connected to the second flow channel and the third flow channel through vents respectively.

[0014] In one embodiment, the cylinder head cover further includes a cover plate, which is arranged on a side of the oil-gas separation mechanism away from the cover body, and the separation chamber is formed between the cover plate and the cover body.

[0015] In one embodiment, the cover plate is connected to the oil-gas separation mechanism through a first connecting member and a second connecting member respectively, a first connecting column is provided in the second flow channel, a second connecting column is provided on the side wall of the second flow channel and the third flow channel bracket, the end of the third retaining rib away from the third flow channel is connected to the first connecting column, a gap is provided between the first connecting column and the side wall of the second flow channel away from the third flow channel, the end of the first retaining rib close to the third flow channel is connected to the second connecting column, at least two connecting holes are provided on the cover plate, the first connecting member and the second connecting member both correspond to the connecting holes, the first connecting member is tightened in the second connecting column through the corresponding connecting hole, and the second connecting member is tightened in the first connecting column through the corresponding connecting hole.

[0016] In one embodiment, the side wall of the first retaining rib is provided with a wave structure;

[0017] And / or, the side wall of the second retaining rib is provided with a wave structure;

[0018] And / or, the side wall of the third rib is provided with a wave structure.

[0019] On the other hand, an engine is also provided, comprising a crankcase and the above-mentioned cylinder head cover, wherein the cylinder head cover is arranged on the crankcase.

[0020] The above-mentioned cylinder head cover is provided with three air inlets and the three air inlets are reasonably arranged. When the vehicle tilts and some of the air inlets are immersed in oil, the gas to be separated can enter the separation chamber through the remaining air inlets, so that the large oil and exhaust gas in the gas are smoothly separated, and the separated oil is effectively prevented from flowing into the air filter in large quantities under the influence of air pressure, thereby protecting the air filter and helping to extend the service life of the air filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the connection between the crankcase, cylinder head cover, exhaust pipe and air filter according to one embodiment of the present application (when the vehicle is driving normally).

[0022] Figure 2 This is a structural diagram of the connection between the crankcase, cylinder head cover, exhaust pipe and air filter according to one embodiment of the present application (when the vehicle is tilted to the left).

[0023] Figure 3 This is a schematic structural diagram of the cylinder head cover described in an embodiment of the present application (when the vehicle is driving normally).

[0024] Figure 4 for Figure 3 Schematic diagram of the cylinder head cover with the cover removed.

[0025] Figure 5 This is a structural diagram of the cylinder head cover according to one embodiment of the present application (when the vehicle is tilted to the right).

[0026] Figure 6 This is a structural diagram of the cylinder head cover according to one embodiment of the present application (when the vehicle is tilted to the left).

[0027] Figure 7 This is a structural diagram of the cylinder head cover described in another embodiment of the present application (when the vehicle is driving normally).

[0028] In the figure: 100, crankcase; 200, cylinder head cover; 300, exhaust pipe; 400, air filter;

[0029] 1. Cover body; 2. Oil-gas separation mechanism; 21. First air inlet; 22. Second air inlet; 23. Third air inlet; 24. First flow channel; 25. Second flow channel; 26. Third flow channel; 27. Fourth flow channel; 28. Blocking assembly; 281. First blocking rib; 282. Second blocking rib; 283. Third blocking rib; 28a. Wave structure; 29. ​​Vent; 210. Reinforced rib; 3. Exhaust member; 4. Cover plate; 41. Connecting hole; 5. First connecting column; 6. Second connecting column. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] See Figure 1 and Figure 2 , Figure 1 The figure shows the connection structure of the crankcase, cylinder head cover, exhaust pipe and air filter in one embodiment (when the vehicle is running normally); Figure 2 The embodiment shows a connection structure diagram of a crankcase, a cylinder head cover, an exhaust pipe and an air filter (when the vehicle is tilted to the left). This embodiment provides an engine that is installed in a scooter-type vehicle and used. The engine includes a crankcase 100 and a cylinder head cover 200 disposed on the crankcase 100. Figure 3 , Figure 3The diagram shows the structure of a cylinder head cover (during normal vehicle operation). Cylinder head cover 200 houses an oil-gas separator 2, which is connected to an exhaust pipe 300. As the gas to be separated passes through the separation chamber of oil-gas separator 2, most of the oil in the gas remains on the inner wall of the separation chamber, separating the oil from the gas. The resulting exhaust gas is then directed from exhaust pipe 300 through air filter 400 and into crankcase 100 for combustion. In some special cases, a vehicle may tilt left or right while driving. For the purposes of this specification, a vehicle operating without tilting left or right is considered to be operating normally.

[0037] See Figure 4 The cylinder head cover 200 includes a cover body 1 and an oil-gas separation mechanism 2. The cover body 1 is configured to cover the engine's crankcase 100. The oil-gas separation mechanism 2 is located on one side of the cover body 1 within the crankcase 100. The oil-gas separation mechanism 2 comprises a separation chamber, a first air inlet 21, a second air inlet 22, and a third air inlet 23. The first air inlet 21, the second air inlet 22, and the third air inlet 23 all communicate with the interior of the separation chamber. An exhaust member 3 is connected to one end of the separation chamber, and the first air inlet 21 is located at the other end. In this embodiment, the exhaust member 3 is connected to the upper end of the separation chamber, while the first air inlet 21 is located at the lower end. The second air inlet 22 and the third air inlet 23 are spaced apart between the exhaust member 3 and the first air inlet 21, with the second air inlet 22 and the third air inlet 23 located on opposite sides of the first air inlet 21. The exhaust member 3 is used to discharge the separated exhaust gas out of the cover body 1. Specifically, the second air inlet 22 is provided on the left side of the first air inlet 21 , and the third air inlet 23 is provided on the right side of the first air inlet 21 .

[0038] When the vehicle is running normally and the amount of residual oil on the cover body 1 is small and the oil does not submerge the first air inlet 21, the second air inlet 22, and the third air inlet 23, the gas to be separated outside the separation mechanism can enter the separation chamber through the first air inlet 21, the second air inlet 22, and the third air inlet 23. Under the action of air pressure, the gas to be separated flows along the set path to the exhaust member 3. During the flow of the gas in the separation chamber, the oil is left on the inner wall of the separation chamber. The separated exhaust gas is discharged from the exhaust member 3 to the outside of the cylinder head cover, filtered by the air filter 400, and then introduced into the crankcase 100 for combustion. Figure 4, an exhaust member 3 and a first air inlet 21 are respectively provided at opposite ends of the separation chamber, a second air inlet 22 and a third air inlet 23 are respectively located between the exhaust member 3 and the first air inlet 21, and the second air inlet 22 is located on the left side of the first air inlet 21 and the third air inlet 23 is located on the right side of the first air inlet 21. When the vehicle tilts to the right during driving and causes the oil to immerse the first air inlet 21 and the third air inlet 23, the gas to be separated can enter the separation chamber from the second air inlet 22 and be discharged along the separation chamber. The gas to be separated flows into the exhaust member 3 along the path of the separation chamber. Thus, even if the first air inlet 21 and the third air inlet 23 are submerged in oil, the air pressure will not force the remaining oil out of the exhaust member 3 and into the air filter 400. When the vehicle tilts to the left, causing the oil to submerge the first air inlet 21 and the second air inlet 22, the gas to be separated can enter the separation chamber from the third air inlet 23 and flow into the exhaust member 3 along the path of the separation chamber. Thus, the air pressure will not force the oil out of the exhaust member 3 and into the air filter 400. The cylinder head cover 200 of this structure, by providing three air inlets and rationally arranging the three air inlets, can enter the separation chamber through the remaining air inlets when the vehicle tilts and some of the air inlets are submerged in oil, allowing the large amount of oil in the gas to be separated from the exhaust gas to be separated smoothly, and effectively preventing the separated oil from flowing into the air filter 400 in large quantities under the influence of air pressure, thereby protecting the air filter 400 and extending the service life of the air filter 400.

[0039] See Figures 4 to 6 , Figure 5 and Figure 6The dashed arrows in the figure indicate the direction of gas flow. A first flow channel 24, a second flow channel 25, and a third flow channel 26 are provided within the separation chamber. One end of the second flow channel 25 and one end of the third flow channel 26 are both connected to one end of the first flow channel 24. The exhaust member 3 is disposed within the first flow channel 24, with the second and third flow channels 25, 26 spaced apart. The first and second air inlets 21, 22 are both disposed on the second flow channel 25, and the third air inlet 23 is disposed on the third flow channel 26. The oil-gas separation mechanism 2 includes a blocking assembly 28 disposed within the second flow channel 25, and between the second air inlet 22 and the first flow channel 24. The blocking assembly 28 includes a first blocking rib 281, a second blocking rib 282, and a third blocking rib 283. The first blocking rib 281, the second blocking rib 282, and the third blocking rib 283 are respectively arranged in sequence and at intervals along the direction from the first flow channel 24 to the second air inlet 22. One end of the first blocking rib 281 and one end of the third blocking rib 283 are both connected to the side wall of the second flow channel 25 close to the third flow channel 26. The other end of the first blocking rib 281 and the other end of the third blocking rib 283 are both spaced from the side wall of the second flow channel 25 away from the third flow channel 26. One end of the second blocking rib 282 is connected to the side wall of the second flow channel 25 away from the third flow channel 26, and the other end of the second blocking rib 282 is spaced from the side wall of the second flow channel 25 close to the third flow channel 26. Figure 6 When the vehicle tilts to the left, the engine tilts along with the vehicle, and the left side of the oil-gas separation mechanism 2 moves downward (driving the second flow channel 25 downward). A second retaining rib 282 is provided in the second flow channel 25. After the cylinder head cover 200 tilts to the left, the second retaining rib 282 protrudes upward into the second flow channel 25. Even if the first air intake port 21 and the second air intake port 22 are submerged, the second retaining rib 282 can block the oil from flowing from the second flow channel 25 to the first flow channel 24 to a certain extent, thereby effectively increasing the maximum allowable oil level when the vehicle tilts to the left. Figure 5 When the vehicle tilts to the right, the left side of the oil-gas separation mechanism 2 will move upward. At this time, the first baffle 281 and the third baffle 283 protrude upward in the second flow channel 25. The first baffle 281 and the second baffle 282 can block the oil entering the separation chamber from the first air inlet 21 and the third air inlet 23 to a certain extent, preventing the oil from flowing to the second air inlet 22. After the gas to be separated enters from the second air inlet 22, it flows in the second flow channel 25 toward the exhaust member 3, thereby effectively increasing the maximum oil level allowed when the vehicle tilts to the right.

[0040] See Figure 4 The second air inlet 22 is arranged on the side wall of the second flow channel 25 away from the third flow channel 26. The second air inlet 22 has an arc-shaped structure. The surface of the arc-shaped second air inlet 22 has a smooth transition, which prevents the side wall of the second air inlet 22 from having a sharp angle and residual oil, which is beneficial to prevent the second air inlet 22 from being blocked by oil.

[0041] Specifically, the exhaust member 3 is disposed at one end of the first flow channel 24 away from the second flow channel 25 to extend the flow path of the gas to be separated as much as possible, which is beneficial to the separation of the engine oil.

[0042] See Figure 4 and Figure 5 A reinforcing rib 210 is provided at the location where the second retaining rib 282 connects to the inner wall of the second flow channel 25. The end of the reinforcing rib 210, which is distal to the second retaining rib 282, extends toward the interior of the second flow channel 25. The provision of the reinforcing rib 210 strengthens the connection between the second retaining rib 282 and the inner wall of the second flow channel 25. Furthermore, it increases the contact area between the gas to be separated and the oil-gas separation mechanism 2, thereby slowing down the airflow and extending the airflow path.

[0043] Continue reading Figure 4 and Figure 5 A fourth flow channel 27 is further provided between the third flow channel 26 and the second flow channel 25. The fourth flow channel 27 is connected to the second flow channel 25 and the third flow channel 26 through a vent 29. The provision of the fourth flow channel 27 increases the flow path of the gas to be separated. The gas entering the second flow channel 25 from the first gas inlet 21 can be diverted through the vent 29 to the fourth flow channel 27, and then sequentially through the third flow channel 26 and the first flow channel 24 to be discharged into the exhaust member 3, thereby effectively extending the flow path of the gas.

[0044] In some embodiments, see Figure 3 The cylinder head cover 200 further includes a cover plate 4, which is arranged on the side of the oil-gas separation mechanism 2 away from the cover body 1. A separation cavity is formed between the cover plate 4 and the cover body 1. The arrangement of the cover plate 4 facilitates the formation of the separation cavity.

[0045] See Figures 4 to 6The cover plate 4 is connected to the oil-gas separation mechanism 2 through a first connecting member (not shown in the figure) and a second connecting member (not shown in the figure). A first connecting column 5 is provided in the second flow channel 25. A second connecting column 6 is provided on the side wall of the bracket of the second flow channel 25 and the third flow channel 26. The end of the third retaining rib 283 away from the third flow channel 26 is connected to the first connecting column 5. There is a gap between the first connecting column 5 and the side wall of the second flow channel 25 away from the third flow channel 26. The end of the first retaining rib 281 close to the third flow channel 26 is connected to the second connecting column 6. At least two connecting holes 41 are provided on the cover plate 4. The first connecting member and the second connecting member both have corresponding connecting holes 41. The first connecting member passes through the corresponding connecting hole 41 and is tightened in the second connecting column 6. The second connecting member passes through the corresponding connecting hole 41 and is tightened in the first connecting column 5. Specifically, the first connecting member and the second connecting member are both connecting screws. The connecting column provides space for tightening the connecting parts, and there is no need to directly open holes on the cover body 1 for tightening the connecting parts, which is beneficial to preventing gas from leaking from the gaps on the cover body 1. The first connecting column 5 and the second connecting column 6 also provide connecting functions for the first retaining rib 281 and the third retaining rib 283 respectively.

[0046] In this example, the first retaining rib 281 and the second connecting column 6 are integrally formed, and the third retaining rib 283 and the first connecting column 5 are integrally formed.

[0047] In some embodiments, see Figure 7 The sidewalls of the first barrier rib 281, the second barrier rib 282, and the third barrier rib 283 are all provided with a wave structure 28a. The wave structure 28a makes the side surfaces of the barrier ribs 282 uneven, effectively increasing the contact area between the barrier ribs 282 and the gas to be separated. The wave structure 28a also increases the tortuosity of the flow channel, further facilitating the adhesion of the oil and improving the oil separation efficiency.

[0048] In actual implementation, the sidewalls of any one or both of the first retaining rib 281 , the second retaining rib 282 and the third retaining rib 283 may be provided with a wave structure 28a as required.

[0049] In other embodiments, see Figure 1 and Figure 2 , also provides an engine, including a crankcase 100 and the above-mentioned cylinder head cover 200, the cylinder head cover 200 is arranged on the crankcase 100, because the first air inlet 21, the second air inlet 22 and the third air inlet 23 are arranged on the cylinder head cover 200, when the vehicle is tilted, the risk of the separated engine oil entering the inside of the air filter 400 under the influence of air pressure can be reduced, which is beneficial to extending the service life of the engine.

[0050] 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.

[0051] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A cylinder head cover, characterized in that: include: A cover body, used for covering the crankcase of the engine; An oil-gas separation mechanism is arranged on a side of the cover body located inside the crankcase, and the oil-gas separation mechanism is provided with a separation chamber, a first air inlet, a second air inlet and a third air inlet. The first air inlet, the second air inlet and the third air inlet are all connected to the interior of the separation chamber, one end of the separation chamber is connected to an exhaust piece, the first air inlet is arranged at an end of the separation chamber away from the exhaust piece, the second air inlet and the third air inlet are both spaced apart between the exhaust piece and the first air inlet, and the second air inlet and the third air inlet are respectively located on opposite sides of the first air inlet, and the exhaust piece is used to discharge the separated exhaust gas to the outside of the cover body.

2. The cylinder head cover according to claim 1, characterized in that: A first flow channel, a second flow channel, and a third flow channel are provided in the separation chamber, one end of the second flow channel and one end of the third flow channel are both connected to one end of the first flow channel, the exhaust member is provided in the first flow channel, the second flow channel and the third flow channel are spaced apart, and the first air inlet and the second air inlet are both provided on the second flow channel, and the third air inlet is provided on the third flow channel; The oil-gas separation mechanism includes a blocking component arranged inside the second flow channel, and the blocking component is located between the second air inlet and the first flow channel, the blocking component includes a first blocking rib, a second blocking rib and a third blocking rib, the first blocking rib, the second blocking rib and the third blocking rib are respectively distributed in sequence and at intervals along the direction of the first flow channel toward the second air inlet, one end of the first blocking rib and one end of the third blocking rib are both connected to the side wall of the second flow channel close to the third flow channel, the other end of the first blocking rib and the other end of the third blocking rib are both spaced from the side wall of the second flow channel away from the third flow channel, one end of the second blocking rib is connected to the side wall of the second flow channel away from the third flow channel, and the other end of the second blocking rib is spaced from the side wall of the second flow channel close to the third flow channel.

3. The cylinder head cover according to claim 2, characterized in that: The second air inlet is arranged on a side wall of the second flow channel away from the third flow channel, and the second air inlet is an arc-shaped structure.

4. The cylinder head cover according to claim 2, characterized in that: The exhaust member is disposed at an end of the first flow channel away from the second flow channel.

5. The cylinder head cover according to claim 2, characterized in that: A reinforcing rib is provided at a position where the second retaining rib is connected to the inner side wall of the second flow channel, and one end of the reinforcing rib away from the second retaining rib extends toward the inside of the second flow channel.

6. The cylinder head cover according to claim 2, characterized in that: A fourth flow channel is further provided between the third flow channel and the second flow channel, and the fourth flow channel is communicated with the second flow channel and the third flow channel respectively through vents.

7. The cylinder head cover according to claim 2, characterized in that: The cylinder head cover further comprises a cover plate, which is arranged on a side of the oil-gas separation mechanism away from the cover body, and the separation chamber is formed between the cover plate and the cover body.

8. The cylinder head cover according to claim 7, characterized in that: The cover plate is connected to the oil-gas separation mechanism through a first connecting member and a second connecting member respectively, a first connecting column is provided in the second flow channel, a second connecting column is provided on the side wall of the second flow channel and the third flow channel bracket, the end of the third retaining rib away from the third flow channel is connected to the first connecting column, a gap is provided between the first connecting column and the side wall of the second flow channel away from the third flow channel, the end of the first retaining rib close to the third flow channel is connected to the second connecting column, at least two connecting holes are provided on the cover plate, the first connecting member and the second connecting member both correspond to the connecting holes, the first connecting member is tightened in the second connecting column through the corresponding connecting hole, and the second connecting member is tightened in the first connecting column through the corresponding connecting hole.

9. The cylinder head cover according to claim 2, characterized in that: The side wall of the first retaining rib is provided with a wave structure; And / or, the side wall of the second retaining rib is provided with a wave structure; And / or, the side wall of the third rib is provided with a wave structure.

10. An engine, characterized in that: The invention comprises a crankcase and a cylinder head cover according to any one of claims 1 to 9, wherein the cylinder head cover is arranged on the crankcase.

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