Crankcase, engine and vehicle
By using an oil-gas separator with a variable conduction structure, the problem of high sealing requirements of orifice plate separation type oil-gas separators is solved, realizing efficient oil-gas separation of the engine under different operating conditions, extending engine life and reducing emissions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIQI FOTON MOTOR CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-12
AI Technical Summary
To improve separation efficiency, existing orifice plate separators require higher sealing performance from the entire unit, which increases the difficulty of design and manufacturing.
The oil-gas separator with a variable conduction structure can switch between a partially conduction state and a fully conduction state through the movable connection of the first and second orifice plate assemblies, and adjust the overlap area of the through holes to adapt to the oil-gas separation efficiency requirements under different operating conditions.
Dynamic optimization of oil-gas separation efficiency was achieved within a limited space, balancing the needs of fine separation under low load and high flow rate under high load, reducing sealing requirements, extending engine life and reducing emissions burden.
Smart Images
Figure CN224352031U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of vehicle technology, specifically relating to a crankcase, engine, and vehicle. Background Technology
[0002] For engines using gasoline or diesel fuel, a crankcase is an essential component, and its ventilation system is equally crucial. When such engines operate, they generate high-temperature gases. These gases escape through the piston ring gaps and enter the crankcase. If these gases mix with engine oil in the crankcase for an extended period, it can accelerate oil deterioration and corrode machine parts. Furthermore, the oil carried by these gases can be re-carried into the engine's combustion system, leading to abnormal oil consumption and increased emissions. To prevent these issues, an oil separator is installed in the crankcase to separate the oil components from the escaped high-temperature gases.
[0003] In related technologies, oil-gas separators are divided into two types: active separation and passive separation. Passive separation includes cyclone type, perforated plate impact type, and filter type, among others. Of these passive separation types, the perforated plate impact type is the most common. The perforated plate oil-gas separator increases the flow velocity of the mixed gas by using a perforated plate to intercept the flow, causing the mixed gas to impact the interior of the knitted fabric, and using the fiber density of the knitted fabric to separate the oil.
[0004] However, in related technologies, orifice plate separation type oil-gas separators require higher sealing performance from the entire machine when improving separation efficiency. Utility Model Content
[0005] The purpose of this application is to provide a crankcase, engine, and vehicle that can solve the problem in related technologies where higher requirements are placed on the sealing performance of the entire machine when improving separation efficiency.
[0006] To solve the above-mentioned technical problems, this application is implemented as follows:
[0007] In a first aspect, embodiments of this application provide a crankcase, including a housing and an oil-gas separator. The housing has an oil-gas separation chamber, and the oil-gas separator is disposed within the oil-gas separation chamber. The oil-gas separator includes a first orifice plate assembly and a second orifice plate assembly. The first orifice plate assembly has a first through hole, and the second orifice plate assembly has a second through hole. The first orifice plate assembly is fixedly connected to the housing, and a portion of the second orifice plate assembly is movable relative to the first orifice plate assembly along a first direction, so that the oil-gas separator switches between a partially conductive state and a fully conductive state. When the oil-gas separator is in the partially conductive state, the first through hole and the second through hole partially overlap. When the oil-gas separator is in the fully conductive state, the first through hole and the second through hole completely overlap. The first direction is the height direction of the crankcase.
[0008] Secondly, embodiments of this application also provide an engine, including the crankcase as described above.
[0009] Thirdly, embodiments of this application also provide a vehicle, including the engine as described above. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the oil-gas separator connected to the housing in an embodiment of this application;
[0011] Figure 2 This is a schematic diagram of the cross-sectional structure of the oil-gas separator connected to the housing in an embodiment of this application;
[0012] Figure 3 This is a partial structural schematic diagram of the oil-gas separator in the embodiments of this application.
[0013] Explanation of reference numerals in the attached figures:
[0014] 10. Housing; 20. Oil-gas separator; 21. First orifice plate assembly; 211. First through hole; 212. Fixing plate; 213. Filter element; 22. Second orifice plate assembly; 221. Second through hole; 222. Limiting element; 2221. Groove; 2222. Through hole; 223. Elastic element; 224. Moving element; 2241. Diaphragm; 2242. Guide rod; 2243. Movable plate. Detailed Implementation
[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0016] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0017] The oil-gas separator, crankcase, and vehicle provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.
[0018] Figure 1 This is a schematic diagram of the oil-gas separator connected to the housing in an embodiment of this application. Figure 2 This is a schematic cross-sectional view of the oil-gas separator connected to the housing in an embodiment of this application. Figure 3 This is a partial structural schematic diagram of the oil-gas separator in an embodiment of this application. In the accompanying drawings and abstract, the X direction is perpendicular to the opening direction of the first through hole 211, and the Y direction is perpendicular to the movable plate 2243. See also... Figures 1 to 3 This application provides a crankcase, including a housing 10 and an oil-gas separator 20. The housing 10 has an oil-gas separation chamber, and the oil-gas separator 20 is disposed in the oil-gas separation chamber. The oil-gas separator 20 includes a first perforated plate assembly 21 and a second perforated plate assembly 22. The first perforated plate assembly 21 has a first through hole 211, and the second perforated plate assembly 22 has a second through hole 221. The first perforated plate assembly 21 is fixedly connected to the housing 10, and a portion of the second perforated plate assembly 22 can move relative to the first perforated plate assembly 21 along an opening direction perpendicular to the first through hole 211, so that the oil-gas separator 20 can switch between a partially conductive state and a fully conductive state. When the oil-gas separator 20 is in the partially conductive state, the first through hole 211 and the second through hole 221 partially overlap. When the oil-gas separator 20 is in the fully conductive state, the first through hole 211 and the second through hole 221 completely overlap.
[0019] In this embodiment, the housing 10 is configured to enclose and form an oil-gas separation chamber, thereby providing space for components such as the oil-gas separator 20. During engine operation, blow-by gas (high-pressure combustible mixture leaking from the combustion chamber, containing unburned fuel, exhaust gas, and oil vapor) is generated in the crankcase. The oil-gas separator 20 can separate oil droplets from the blow-by gas, preventing oil from entering the intake system with the gas. The oil-gas separator 20 is a key component for extending engine life and reducing emissions. The first orifice plate assembly 21 has a first through hole 211, and the second orifice plate assembly 22 has a second through hole 221. The first orifice plate assembly 21 and the second orifice plate assembly 22 are configured to change the airflow direction, and the blow-by gas introduced into the oil-gas separation chamber is discharged after being separated from the oil through inertial collision and gravitational settling. The second orifice plate assembly 22 can move relative to the first orifice plate assembly 21 along an opening direction perpendicular to the first through hole 211. It can be understood that the first orifice plate assembly 21 and the second orifice plate assembly 22 form a variable conduction structure, enabling adjustment of the overlap area between the first through hole 211 and the second through hole 221, thereby optimizing the oil-gas separation efficiency under different operating conditions. Specifically, the first through hole 211 can serve as a reference channel for airflow, while the second orifice plate assembly 22 can move along an opening direction perpendicular to the first through hole 211. That is, by moving, the overlap area between the second through hole 221 and the first through hole can be changed, thereby adjusting the conduction state of the oil-gas separator 20.
[0020] When the oil-gas separator 20 is in a partially open state, the first through-hole 211 and the second through-hole 221 partially overlap, resulting in a smaller conducting area. As the airflow passes through this narrow overlapping area, its velocity increases, enhancing the inertial separation effect. Oil droplets are more easily condensed and separated due to high-speed impacts with the first orifice plate assembly 21 and the second orifice plate assembly 22. This design maintains high separation efficiency even at low flow rates, preventing excessive oil intake into the combustion chamber.
[0021] With the oil-gas separator 20 fully open, the conduction area is large, and the first through-hole 211 and the second through-hole 221 completely overlap. Airflow resistance is reduced, meeting the demands of high-flow ventilation and preventing excessive crankcase pressure. Separation efficiency may decrease slightly, but at high loads, the oil mist concentration is higher, and inertial separation remains effective. This has the beneficial effect of preventing seal leakage or abnormal oil consumption due to insufficient ventilation.
[0022] The embodiments of this application can be adjusted within a limited space, and have the beneficial effect of dynamically optimizing the ventilation volume and oil-gas separation efficiency in the crankcase according to the working conditions, while taking into account both the fine separation under low load and the demand for large flow under high load.
[0023] Optionally, in this embodiment, the second orifice plate assembly 22 includes a limiting member 222, an elastic member 223, and a movable member 224. The limiting member 222 is fixedly connected to the housing 10, the movable member 224 is movably connected to the limiting member 222, one end of the elastic member 223 is connected to the limiting member 222, and the other end of the elastic member 223 is connected to the movable member 224. When the oil-gas separator 20 is in a partially open state, the elastic member 223 is in a compressed state; when the oil-gas separator 20 is in a fully open state, the elastic member 223 is in a compressed state or a free state.
[0024] In this embodiment, the limiting member 222 is connected to the housing 10. The limiting member 222 is provided to provide a movement track and displacement limit for the movable member 224, preventing the movable member 224 from dislodging or excessively displacing. The movable member 224 may have a second through hole 221 in the second perforated plate assembly 22, and the overlap area of the first through hole 211 and the second through hole 221 can be changed by the movement relative to the first perforated plate assembly 21. When the crankcase pressure changes, the movable member 224 moves under the drive of the elastic member 223 or the action of external force (such as airflow pressure) to achieve adjustment. Further, when the elastic member 223 is in a compressed state, the first through hole 211 and the second through hole 221 partially overlap. When the elastic member 223 is switched from a compressed state to a free state by an external force, or when the elastic member 223 is in a free state, the first through hole 211 and the second through hole 221 can completely overlap, thereby increasing the conduction area.
[0025] In practical applications, when the engine is first started, the air pressure in the crankcase is low, the oil-gas flow rate is small, the elastic element 223 is in a compressed state, and the overlap area of the first through hole 211 and the second through hole 221 is small, resulting in a larger oil-gas separation effect compared to a single-piece orifice plate. When the oil-gas flow rate increases, the pressure in the crankcase increases. The upward crankcase pressure overcomes atmospheric pressure and the elastic force of the elastic element 223, pulling the moving part 224 upward. The overlap area of the first through hole 211 and the second through hole 221 increases. At this time, the flow velocity through the oil-gas separator 20 is still high-speed impact, maximizing the separation efficiency.
[0026] In this embodiment, by setting the limiting member 222, the elastic member 223 and the movable member 224, a dynamic balance between ventilation volume and separation efficiency can be achieved, which has the beneficial effects of self-adaptation, high-efficiency separation, long service life and low cost, and is suitable for modern engine systems with changing operating conditions.
[0027] Optionally, in this embodiment, the movable component 224 includes a diaphragm 2241, a guide rod 2242, and a movable plate 2243. The guide rod 2242 is movably connected to the limiting component 222 along the opening direction perpendicular to the first through hole 211. The diaphragm 2241 is disposed on the side of the limiting component 222 away from the first hole plate assembly 21 and is connected to the end of the elastic component 223 away from the limiting component 222. The diaphragm 2241 and the movable plate 2243 are respectively connected to the two ends of the guide rod 2242 along the opening direction perpendicular to the first through hole 211. The second through hole 221 is opened in the movable plate 2243.
[0028] In this embodiment, the guide rod 2242 is limited by the limiting member 222. The guide rod 2242 is movably connected to the limiting member 222 along the opening direction perpendicular to the first through hole 211, ensuring that the movable plate 2243 can only move along a preset path, avoiding deflection or jamming. Furthermore, the guide rod 2242 also transmits the pressure on the diaphragm 2241 or the rebound force of the elastic member 223 to the movable plate 2243, driving it to displace relative to the first perforated plate assembly 21. The diaphragm 2241 is designed to directly sense changes in air pressure inside the crankcase. When the air pressure increases, the diaphragm 2241 is driven by the air pressure to overcome the elastic force of the elastic member 223 and atmospheric pressure, causing the guide rod 2242 to move upward. This causes the movable plate 2243 to move upward. The movable plate 2243 has a second through hole 221. During the upward movement of the movable plate 2243, the overlap area of the first through hole 211 and the second through hole 221 increases. At this time, the flow velocity through the oil-gas separator 20 still impacts at high speed, maximizing the separation efficiency. In the embodiment of this application, by setting the diaphragm 2241, guide rod 2242, and movable plate 2243, the overlap area of the first through hole 211 and the second through hole 221 can be adjusted for different operating conditions, thereby achieving the beneficial effect of improving oil-gas separation efficiency. Furthermore, the diaphragm 2241 can directly sense the pressure inside the crankcase, with a high response speed. The diaphragm 2241, guide rod 2242, and movable component 224 have a compact structure, requiring no additional space, making them suitable for modern engine designs with limited space.
[0029] Optionally, in this embodiment, there are two elastic elements 223, which are arranged on both sides of the guide rod 2242 in a direction perpendicular to the movable plate 2243.
[0030] In this embodiment, two elastic elements 223 are symmetrically arranged on both sides of the guide rod 2242 along a direction perpendicular to the movable plate 2243, forming a parallel elastic support structure. The direction perpendicular to the movable plate 2243 is perpendicular to the direction of movement of the guide rod 2242, ensuring that the elastic force only acts on the movable plate 2243 as it moves up and down along the opening direction perpendicular to the first through hole 211, thus preventing lateral displacement. Furthermore, if one elastic element 223 fails (e.g., breaks), the other elastic element 223 can still maintain its basic function, preventing the movable plate 2243 from completely losing control. Moreover, the dual elastic elements 223 share the load, reducing the fatigue rate of a single elastic element 223, thus extending the service life of the elastic element 223.
[0031] It should be noted that the number of elastic elements 223 can also be four or six. This embodiment does not impose any limitation on the specific number; any number that is an even multiple is acceptable. The even multiples of elastic elements 223 are respectively arranged on both sides of the guide rod 2242 along a direction perpendicular to the movable plate 2243.
[0032] Optionally, in this embodiment, the limiting member 222 has a groove 2221 with the opening of the groove 2221 facing the diaphragm 2241. The elastic member 223 is disposed in the groove 2221 and can extend or shorten along the opening direction perpendicular to the first through hole 211. One end of the elastic member 223 is connected to the bottom wall of the groove 2221, and the other end of the elastic member 223 is connected to the diaphragm 2241.
[0033] In this embodiment, the opening of the groove 2221 faces the diaphragm 2241, forming a semi-closed cavity that constrains the movement trajectory of the elastic element 223, ensuring that the elastic element 223 can only extend and retract along the opening direction perpendicular to the first through hole 211 (axial direction of the guide rod 2242), avoiding lateral twisting or displacement. The bottom wall of the groove 2221 serves as a fixed fulcrum for the elastic element 223, directly transmitting the elastic force to the diaphragm 2241, reducing energy loss caused by intermediate structures. The diaphragm 2241 is both a pressure sensing element and an actuating element for applying the elastic force to the elastic element 223, realizing direct linkage of "air pressure → displacement → through hole 2222 adjustment". In this embodiment, the cooperative design of the groove 2221, the elastic element 223, and the diaphragm 2241 has the beneficial effects of saving space and optimizing force transmission.
[0034] Optionally, in this embodiment of the application, the limiting member 222 is further provided with a through hole 2222, the through hole 2222 is opened along the opening direction perpendicular to the first through hole 211, and the guide rod 2242 is inserted into the through hole 2222 and can move along the opening direction perpendicular to the first through hole 211.
[0035] In this embodiment, the through hole 2222 is provided to provide movement space for the guide rod 2242. At the same time, the through hole 2222 also limits the guide rod 2242 and constrains its movement trajectory, ensuring that the guide rod 2242 can only move along the opening direction perpendicular to the first through hole 211. This has the beneficial effect of avoiding lateral twisting or offset that would cause an angle between the movable plate 2243 and the first orifice plate assembly 21, resulting in an offset of the overlapping area of the first through hole 211 and the second through hole 221, thereby affecting the oil-gas separation efficiency.
[0036] Optionally, in this embodiment of the application, the first perforated plate assembly 21 includes a fixed plate 212 and a filter element 213. The fixed plate 212 is fixedly connected to the housing 10, the first through hole 211 is opened in the fixed plate 212, and the filter element 213 is disposed on the side of the fixed plate 212 away from the movable plate 2243, and the filter element 213 is disposed opposite to the first through hole 211.
[0037] In this embodiment, the fixed plate 212 is configured to open the first through hole 211, forming a fixed part of the airflow channel. It cooperates with the second through hole 221 of the movable plate 2243. By adjusting the overlap area of the first through hole 211 and the second through hole 221, different operating conditions can be addressed. The filter element 213 can perform coarse separation. Through the physical blocking of the filter material (such as fiber felt), it directly collides with and captures large-diameter oil droplets (typically >10μm) in the airflow, reducing the load on subsequent separation stages. Simultaneously, it can prevent the intrusion of particulate matter, significantly improving separation efficiency, protecting downstream components, and enhancing engine performance, emissions, and reliability.
[0038] It should be noted that the filter element 213 is detachably connected to the fixing plate 212, which facilitates subsequent cleaning or replacement.
[0039] Optionally, in this embodiment, when the oil-gas separator 20 is in a fully open state, the flowable area of the first through hole 211 is A; when the oil-gas separator 20 is in a partially open state, the flowable area of the first through hole 211 is B, wherein B ≥ 30% A and B ≤ A.
[0040] In this embodiment, when the engine is first started, the crankcase pressure is low and the oil-gas flow rate is small. The oil-gas separator 20 is in a partially open state, and the movable plate 2243 partially blocks the first through hole 211, meaning the overlap area of the first through hole 211 and the second through hole 221 is small, restricting airflow. At this time, the overlap area must be at least 30% of the flowable area of the first through hole 211. When the oil-gas flow rate increases, the crankcase pressure increases accordingly, and the overlap area of the first through hole 211 and the second through hole 221 increases. This allows the flowable area of the first through hole 211 to be adjusted to the maximum. At this time, the oil-gas flow velocity through the oil-gas separator 20 still impacts the first orifice plate assembly 21 and the second orifice plate assembly 22 at high speed, thereby maximizing the separation efficiency.
[0041] When the oil and gas flow rate increases, the pressure inside the crankcase increases. The upward crankcase pressure overcomes the atmospheric pressure and the elastic force of the elastic element 223, and pulls the moving part 224 upward. The overlapping area of the first through hole 211 and the second through hole 221 increases. At this time, the flow velocity through the oil and gas separator 20 is still high-speed impact, so that the separation efficiency reaches the maximum.
[0042] Optionally, in this embodiment of the application, an engine is also provided, including the crankcase as described above.
[0043] In this embodiment, the engine includes the crankcase as described above, and also includes all the structural features and beneficial effects of the crankcase, which are not limited in this embodiment. By providing a crankcase with an adjustable conduction area, the engine optimizes the performance of the crankcase ventilation system, thereby effectively improving the overall efficiency, reliability, and environmental friendliness of the engine.
[0044] Optionally, in this embodiment of the application, a vehicle is also provided, including the engine as described above.
[0045] In this embodiment, the vehicle includes the engine as described above, and consequently all structural features and beneficial effects of the engine, which are not limited in this embodiment. This vehicle, by employing an engine with adaptive baffle-type oil-gas separation technology, significantly improves power, economy, and environmental friendliness, while reducing maintenance costs.
[0046] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0047] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A crankcase, characterized in that, It includes a housing (10) and an oil-gas separator (20), the housing (10) having an oil-gas separation chamber, and the oil-gas separator (20) being disposed within the oil-gas separation chamber; The oil-gas separator (20) includes a first orifice plate assembly (21) and a second orifice plate assembly (22). The first orifice plate assembly (21) has a first through hole (211), and the second orifice plate assembly (22) has a second through hole (221). The first orifice plate assembly (21) is fixedly connected to the housing (10), and a portion of the second orifice plate assembly (22) is movable relative to the first orifice plate assembly (21) along the opening direction perpendicular to the first through hole (211) so that the oil-gas separator (20) can switch between a partially open state and a fully open state. When the oil-gas separator (20) is in the partially open state, the first through hole (211) and the second through hole (221) partially overlap; When the oil-gas separator (20) is in a fully open state, the first through hole (211) and the second through hole (221) completely overlap.
2. The crankcase according to claim 1, characterized in that, The second perforated plate assembly (22) includes a limiting member (222), an elastic member (223), and a movable member (224). The limiting member (222) is fixedly connected to the housing (10), and the movable member (224) is movably connected to the limiting member (222). One end of the elastic member (223) is connected to the limiting member (222), and the other end of the elastic member (223) is connected to the movable member (224). When the oil-gas separator (20) is in the partially open state, the elastic element (223) is in the compressed state; When the oil-gas separator (20) is in the fully open state, the elastic element (223) is in a compressed state or a free state.
3. The crankcase according to claim 2, characterized in that, The movable component (224) includes a diaphragm (2241), a guide rod (2242), and a movable plate (2243). The guide rod (2242) is movably connected to the limiting component (222) along an opening direction perpendicular to the first through hole (211). The diaphragm (2241) is disposed on the side of the limiting component (222) away from the first hole plate assembly (21) and is connected to the end of the elastic component (223) away from the limiting component (222). The diaphragm (2241) and the movable plate (2243) are respectively connected to the two ends of the guide rod (2242). The second through hole (221) is opened in the movable plate (2243).
4. The crankcase according to claim 3, characterized in that, The number of elastic elements (223) is two, and the two elastic elements (223) are arranged on both sides of the guide rod (2242) in a direction perpendicular to the movable plate (2243).
5. The crankcase according to claim 3, characterized in that, The limiting member (222) has a groove (2221) with the opening of the groove (2221) facing the diaphragm (2241). The elastic member (223) is disposed in the groove (2221) and can extend or shorten along the opening direction perpendicular to the first through hole (211). One end of the elastic element (223) is connected to the bottom wall of the groove (2221), and the other end of the elastic element (223) is connected to the diaphragm (2241).
6. The crankcase according to claim 5, characterized in that, The limiting member (222) is also provided with a through hole (2222), which is opened along the first direction (X). The guide rod (2242) is inserted into the through hole (2222) and can move along the opening direction perpendicular to the first through hole (211).
7. The crankcase according to claim 6, characterized in that, The first perforated plate assembly (21) includes a fixed plate (212) and a filter element (213). The fixed plate (212) is fixedly connected to the housing (10). The first through hole (211) is opened on the fixed plate (212). The filter element (213) is disposed on the side of the fixed plate (212) away from the movable plate (2243), and the filter element (213) is disposed opposite to the first through hole (211).
8. The crankcase according to claim 1, characterized in that, When the oil-gas separator (20) is in a fully open state, the flowable area of the first through hole (211) is A; When the oil-gas separator (20) is in the partially open state, the flowable area of the first through hole (211) is B, where B ≥ 30% A and B ≤ A.
9. An engine, characterized in that, Includes the crankcase as described in any one of claims 1-8.
10. A vehicle, characterized in that, Including the engine as described in claim 9.