An engine crankcase

Abstract

This utility model discloses an engine crankcase, including a left crankcase, a right crankcase, and a crankcase gasket. The left crankcase has a left labyrinth cavity; the right crankcase has a right labyrinth cavity and a labyrinth entrance, with an exhaust nozzle at the top of the right labyrinth cavity. The crankcase gasket isolates the left and right labyrinth cavities and has a first vent and a second vent. The first vent connects the labyrinth entrance and the left labyrinth cavity, and the second vent connects the left and right labyrinth cavities. A first labyrinth channel is formed between the left labyrinth cavity and the crankcase gasket. The first labyrinth channel includes a first descending section, a first turning section, and a first ascending section connected in sequence. The top of the first descending section connects to the first vent, and the top of the first ascending section connects to the second vent. The cross-sectional area of ​​the first descending section gradually decreases towards the first turning section. This engine crankcase improves the oil-gas separation effect of the labyrinth cavity and reduces crankcase oil consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of engine structure, and in particular to an engine crankcase. Background Technology

[0002] An engine crankcase is typically made up of a left and a right crankcase connected by a gasket.

[0003] The crankcase contains engine oil. When the engine is running at high speed, the engine oil is prone to splashing and mixing with the exhaust gas. This causes the engine oil to spray out of the crankcase through the exhaust pipe, resulting in oil spraying and reducing the amount of engine oil.

[0004] To reduce the amount of engine oil discharged from the exhaust pipe with the exhaust gas, existing technologies use a labyrinth chamber in the crankcase to separate oil and gas before expelling the exhaust gas.

[0005] However, existing crankcases have poor oil-gas separation performance, which is insufficient for current large-displacement engines. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an engine crankcase that improves the oil-gas separation effect of the labyrinth cavity and reduces crankcase oil consumption.

[0007] An engine crankcase according to an embodiment of the present invention includes: The left box contains a left labyrinth cavity; The right chamber is provided with a right labyrinth cavity and a labyrinth entrance. An exhaust nozzle is provided at the top of the right labyrinth cavity for discharging exhaust gas. A housing gasket is disposed between the left housing and the right housing to isolate the left labyrinth cavity and the right labyrinth cavity. It is provided with a first vent and a second vent. The first vent connects the labyrinth entrance and the left labyrinth cavity, and the second vent connects the left labyrinth cavity and the right labyrinth cavity. The left maze cavity and the box gasket form a first maze channel. The first maze channel is U-shaped and includes a first descending section, a first turning section and a first ascending section connected in sequence. The top end of the first descending section is connected to the first vent, and the top end of the first ascending section is connected to the second vent. The cross-sectional area of ​​the first descending section gradually decreases along the direction close to the first turning section.

[0008] An engine crankcase according to an embodiment of the present utility model has at least the following beneficial effects: 1. This utility model forms a two-stage labyrinth channel through the cooperation of the left labyrinth cavity, the right labyrinth cavity and the housing gasket, which extends the flow path of the mixed oil and gas in the labyrinth cavity, significantly improves the oil and gas separation efficiency, and solves the problem of insufficient separation in large displacement engines.

[0009] 2. This utility model sets the first labyrinth channel in a U-shape, so that the mixed oil and gas enter the first labyrinth channel from the top of the first descending section, then flow downward along the first descending section, then flow through the first turning section to the bottom of the first ascending section, and then flow upward along the first ascending section from the bottom of the first ascending section. This forces the mixed oil and gas to change direction, increases the probability of oil droplets colliding with the wall of the first labyrinth channel, promotes the separation of oil droplets and exhaust gas, and further improves the oil and gas separation efficiency.

[0010] 3. This utility model increases the flow velocity of the mixed oil and gas by gradually reducing the cross-sectional area of ​​the first descending section towards the first turning section. The oil droplets impact the wall due to inertia. Increasing the flow velocity of the mixed oil and gas enhances the inertial separation effect of the oil droplets. In particular, by continuously increasing the speed of the mixed oil and gas in the first descending section, the impact force of the mixed airflow on the side wall of the first turning section can be further increased, so that the oil droplets of the mixed oil and gas fully adhere to the side wall of the first turning section, further improving the oil and gas separation efficiency.

[0011] According to some embodiments of the present invention, the bottom end of the first descending segment extends downward at an angle and connects to one end of the first turning segment, the other end of the first turning segment connects to the bottom end of the first ascending segment, and the top end of the first ascending segment extends upward at an angle close to the first descending segment.

[0012] The advantages of this invention are: by extending the bottom of the first descending section downwards at an angle and connecting it to one end of the first turning section, and connecting the other end of the first turning section to the bottom of the first ascending section, and extending the top of the first ascending section upwards at an angle close to the first descending section, the mixed oil and gas can continuously collide with the sidewall of the first labyrinth channel during the flow of the first descending and first ascending sections. By utilizing the adhesion effect between the wall and the mixed oil and gas, the flow of engine oil is blocked, thereby enhancing the oil-gas separation effect of the first labyrinth channel on the mixed oil and gas.

[0013] According to some embodiments of the present invention, the first rising section is provided with a first oil-blocking rib, which is disposed on the side wall of the first rising section away from the first falling section.

[0014] The advantage of this invention is that by providing a first oil-blocking rib in the first rising section, and the first oil-blocking rib being located on the side wall of the first rising section away from the first falling section, the first oil-blocking rib can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow back along the wall surface, thereby further improving the oil-gas separation effect.

[0015] According to some embodiments of the present invention, the first descending section is provided with a second oil-blocking rib, which is disposed on the side wall of the first descending section near the first ascending section.

[0016] The advantage of this invention is that by providing a second oil-blocking rib in the first descending section, which is located on the side wall of the first descending section near the first ascending section, the second oil-blocking rib can directly block the oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow along the wall to the bottom of the first turning section, thereby further improving the oil-gas separation effect.

[0017] According to some embodiments of the present invention, a first oil return port extending downward is provided at the bottom of the first turning section, and the first oil return port is used to discharge the engine oil in the first labyrinth channel.

[0018] The advantage of this invention is that by setting a downward-extending first oil return port at the bottom of the first turning section, the first oil return port is used to discharge the oil in the first labyrinth channel. It can be understood that by setting a first oil return port at the bottom of the first turning section, the accumulated oil is discharged in time, preventing the accumulated oil from being re-swept away by the airflow, and ensuring that the first labyrinth channel can continuously and efficiently perform oil-gas separation.

[0019] According to some embodiments of the present invention, the right box body is provided with a first isolation rib, which is used to isolate the right labyrinth cavity and the labyrinth entrance.

[0020] The advantages of this invention are: by providing a first isolation rib in the right chamber, the first isolation rib is used to isolate the right labyrinth cavity and the labyrinth entrance. It can be understood that the first isolation rib physically separates the right labyrinth cavity from the labyrinth entrance, preventing unseparated mixed oil and gas from directly entering the exhaust nozzle from the right labyrinth cavity, ensuring that all mixed oil and gas must be pre-treated in the left labyrinth cavity before entering the right labyrinth cavity, ensuring the integrity of the two-stage separation process, and improving the overall separation efficiency.

[0021] According to some embodiments of the present invention, a second maze channel is formed between the right maze cavity and the box gasket. The second maze channel is U-shaped and includes a second descending section, a second turning section and a second ascending section connected in sequence. The top end of the second descending section is connected to the second vent hole. The exhaust nozzle is disposed at the top end of the second ascending section. The cross-sectional area of ​​the second descending section gradually decreases along the direction close to the second turning section.

[0022] The advantages of this invention are: by forming a second labyrinth channel between the right labyrinth cavity and the housing gasket, the second labyrinth channel is U-shaped and includes a second descending section, a second turning section, and a second ascending section connected in sequence. The top of the second descending section is connected to a second vent, and the exhaust nozzle is located at the top of the second ascending section. The cross-sectional area of ​​the second descending section gradually decreases towards the second turning section. It can be understood that, on the one hand, by setting the second labyrinth channel to a U-shape, the mixed oil and gas enters the second labyrinth channel from the top of the second descending section, then flows downwards along the second descending section, then flows through the second turning section to the bottom of the second ascending section, and then from the bottom of the second ascending section... The oil and gas flow upward along the second ascending section, forcing the mixed oil and gas to change direction, increasing the probability of oil droplets colliding with the wall of the second labyrinth channel, promoting the separation of oil droplets and exhaust gas, and further improving the oil and gas separation efficiency. On the other hand, the cross-sectional area of ​​the second descending section gradually shrinks along the direction close to the second turning section, thereby increasing the flow velocity of the mixed oil and gas. The oil droplets collide with the wall due to inertia. By increasing the flow velocity of the mixed oil and gas, the inertial separation effect of the oil droplets can be enhanced. In particular, by continuously increasing the speed of the mixed oil and gas in the second descending section, the impact force of the mixed airflow on the side wall of the second turning section can be further increased, so that the oil droplets of the mixed oil and gas fully adhere to the side wall of the second turning section, further improving the oil and gas separation efficiency.

[0023] According to some embodiments of the present invention, the bottom end of the second descending segment extends downward at an angle and connects to one end of the second turning segment, the other end of the second turning segment connects to the bottom end of the second ascending segment, and the top end of the second ascending segment extends upward at an angle close to the second descending segment.

[0024] The advantages of this invention are: by extending the bottom of the second descending section downwards at an angle and connecting it to one end of the second turning section, and connecting the other end of the second turning section to the bottom of the second ascending section, and extending the top of the second ascending section upwards at an angle close to the second descending section, the mixed oil and gas can continuously collide with the sidewall of the second labyrinth channel during the flow of the second descending and ascending sections. By utilizing the adhesion effect between the wall and the mixed oil and gas, the flow of engine oil is blocked, thereby enhancing the oil-gas separation effect of the second labyrinth channel on the mixed oil and gas.

[0025] According to some embodiments of the present invention, the second rising section is provided with a third oil-blocking rib, which is disposed on the side wall of the second rising section away from the second falling section. And / or, the second descending section is provided with a fourth oil baffle, which is located on the side wall of the second descending section near the second ascending section.

[0026] The advantages of this invention are as follows: By providing a third oil-blocking rib in the second ascending section, which is located on the side wall of the second ascending section away from the second descending section, the third oil-blocking rib can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow back along the wall surface, thus further improving the oil-gas separation effect. In addition, by providing a fourth oil-blocking rib in the second descending section, which is located on the side wall of the second descending section close to the second ascending section, the fourth oil-blocking rib can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow along the wall surface to the bottom of the second turning section, thus further improving the oil-gas separation effect.

[0027] According to some embodiments of the present invention, a second oil return port extending downward is provided at the bottom of the second turning section, and the second oil return port is used to discharge the engine oil in the second labyrinth channel.

[0028] The advantage of this invention is that by providing a downward-extending second oil return port at the bottom of the second turning section, the second oil return port is used to discharge the oil in the second labyrinth channel. It can be understood that by providing a second oil return port at the bottom of the second turning section, the accumulated oil can be discharged in a timely manner, preventing the accumulated oil from being re-swept away by the airflow, and ensuring that the second labyrinth channel can continuously and efficiently perform oil-gas separation.

[0029] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the left crankcase of an engine and the crankcase gasket in accordance with an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the left crankcase of an engine according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the right crankcase of an engine and the crankcase gasket in accordance with an embodiment of the present invention. Figure 4 This is a schematic diagram of the right crankcase of an engine according to an embodiment of the present invention.

[0032] Attached reference numerals: 100-Left housing, 110-Left labyrinth cavity, 120-Right housing, 130-Right labyrinth cavity, 140-Maze entrance, 150-Exhaust nozzle, 160-Housing gasket, 170-First vent, 180-Second vent, 190-First labyrinth passage, 200-First descent section, 210-First turning section, 220-First ascent section, 230-First oil baffle, 240-Second oil baffle, 250-First oil return port, 260-First isolation rib, 270-Second labyrinth passage, 280-Second descent section, 290-Second turning section, 300-Second ascent section, 310-Third oil baffle, 320-Fourth oil baffle, 330-Second oil return port. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4This invention describes an engine crankcase according to an embodiment of the present invention.

[0038] The present invention aims to provide an embodiment of an engine crankcase.

[0039] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, an engine crankcase mainly includes a left crankcase 100, a right crankcase 120, and a crankcase gasket 160.

[0040] Reference Figure 2 For the left box 100, the left box 100 is provided with a left labyrinth cavity 110.

[0041] Reference Figure 4 For the right chamber 120, the right chamber 120 is provided with a right labyrinth cavity 130 and a labyrinth entrance 140. The top of the right labyrinth cavity 130 is provided with an exhaust nozzle 150, which is used to discharge exhaust gas.

[0042] In some specific embodiments, the right box 120 is provided with a first isolation rib 260, which is used to isolate the right labyrinth cavity 130 and the labyrinth entrance 140.

[0043] Understandably, the first isolation rib 260 physically separates the right labyrinth cavity 130 from the labyrinth entrance 140, preventing unseparated mixed oil and gas from directly entering the exhaust nozzle 150 from the right labyrinth cavity 130. This ensures that all mixed oil and gas must be pre-treated by the left labyrinth cavity 110 before entering the right labyrinth cavity 130, thus guaranteeing the integrity of the two-stage separation process and improving the overall separation efficiency.

[0044] In some specific embodiments, the cross-sectional area of ​​the exhaust nozzle 150 may be not less than the cross-sectional area of ​​the top of the second rising section 300 described below.

[0045] Understandably, during the power stroke, the piston moves downwards, and the oil-gas mixture leaking from the piston ring seal enters the crankcase, increasing the pressure inside the crankcase. This mixture then enters the labyrinth chamber. Through the structural cooperation of the left labyrinth chamber 110, the right labyrinth chamber 130, and the crankcase gasket 160, the oil-gas mixture is separated by the right labyrinth chamber 130 and the left labyrinth chamber 110 before being discharged from the exhaust nozzle 150, reducing oil consumption. Conversely, during compression, the piston moves upwards, decreasing the pressure inside the crankcase. Cold air from outside enters the engine through the exhaust nozzle, flowing in the opposite direction through the right labyrinth chamber 130 and the left labyrinth chamber 110, allowing air exchange between the engine and the atmosphere, which helps lower engine temperature. In this embodiment, by ensuring that the cross-sectional area of ​​the exhaust nozzle 150 is not less than the cross-sectional area of ​​the top of the second rising section 300 (described below), the cross-sectional area of ​​the exhaust nozzle 150 is increased, which improves air exchange efficiency and thus more effectively lowers engine temperature.

[0046] In some specific embodiments, the labyrinth entrance 140 can be located below the top of the clutch, so that the oil-gas mixture in the crankcase can use the high-speed rotation of the clutch to break up large oil droplets and perform the first separation, and then the oil-gas mixture enters the labyrinth cavity, thereby improving the oil-gas separation effect of the crankcase.

[0047] Reference Figure 1 and Figure 3 For the housing gasket 160, the housing gasket 160 is disposed between the left housing 100 and the right housing 120. The housing gasket 160 is used to isolate the left labyrinth cavity 110 and the right labyrinth cavity 130. The housing gasket 160 is provided with a first vent 170 and a second vent 180. The first vent 170 connects the labyrinth entrance 140 and the left labyrinth cavity 110, and the second vent 180 connects the left labyrinth cavity 110 and the right labyrinth cavity 130.

[0048] Understandably, the oil-gas mixture in the crankcase enters the labyrinth inlet 140, then enters the left labyrinth chamber 110 through the first vent 170, then enters the right labyrinth chamber 130 through the second vent 180, and finally exits through the exhaust port 150.

[0049] In this embodiment, a two-stage labyrinth channel is formed by the cooperation of the left labyrinth cavity 110, the right labyrinth cavity 130 and the housing gasket 160, which extends the flow path of the mixed oil and gas in the labyrinth cavity, significantly improves the oil and gas separation efficiency, and solves the problem of insufficient separation in large displacement engines.

[0050] In some specific embodiments, a first maze channel 190 is formed between the left maze cavity 110 and the box gasket 160. The first maze channel 190 is U-shaped and includes a first descending section 200, a first turning section 210 and a first ascending section 220 connected in sequence. The top end of the first descending section 200 is connected to a first vent 170, and the top end of the first ascending section 220 is connected to a second vent 180. The cross-sectional area of ​​the first descending section 200 gradually decreases along the direction close to the first turning section 210.

[0051] In this embodiment, by setting the first labyrinth channel 190 as U-shaped, the mixed oil and gas enters the first labyrinth channel 190 from the top of the first descending section 200, then flows downward along the first descending section 200, then flows through the first turning section 210 to the bottom of the first ascending section 220, and then flows upward along the first ascending section 220 from the bottom of the first ascending section 220. This forces the mixed oil and gas to change direction, increases the probability of oil droplets colliding with the wall of the first labyrinth channel 190, promotes the separation of oil droplets and exhaust gas, and further improves the oil and gas separation efficiency.

[0052] In this embodiment, by gradually reducing the cross-sectional area of ​​the first descending section 200 towards the first turning section 210, the flow velocity of the mixed oil and gas is increased. The oil droplets impact the wall due to inertia. By increasing the flow velocity of the mixed oil and gas, the inertial separation effect of the oil droplets can be enhanced. In particular, by continuously increasing the speed of the mixed oil and gas in the first descending section 200, the impact force of the mixed airflow on the side wall of the first turning section 210 can be further increased, so that the oil droplets of the mixed oil and gas can fully adhere to the side wall of the first turning section 210, thereby further improving the oil and gas separation efficiency.

[0053] In some specific embodiments, the bottom end of the first descending section 200 extends downward at an angle and connects to one end of the first turning section 210, the other end of the first turning section 210 connects to the bottom end of the first ascending section 220, and the top end of the first ascending section 220 extends upward at an angle close to the first descending section 200. This allows the mixed oil and gas to continuously collide with the sidewall of the first labyrinth channel 190 during the flow of the first descending section 200 and the first ascending section 220. By utilizing the adhesion effect between the wall and the mixed oil and gas, the flow of engine oil is blocked, thereby enhancing the oil-gas separation effect of the first labyrinth channel 190 on the mixed oil and gas.

[0054] Furthermore, the first rising section 220 is provided with a first oil-blocking rib 230, which is located on the side wall of the first rising section 220 away from the first falling section 200. Thus, the first oil-blocking rib 230 can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow back along the wall surface, thereby further improving the oil-gas separation effect.

[0055] In some specific embodiments, the first descending section 200 is provided with a second oil-blocking rib 240. The second oil-blocking rib 240 is located on the side wall of the first descending section 200 near the first ascending section 220. Thus, the second oil-blocking rib 240 can directly block oil droplets in the flowing mixed oil and gas, so that the oil droplets adhere to the wall and flow along the wall to the bottom of the first turning section 210, further improving the oil-gas separation effect.

[0056] In some specific embodiments, the bottom of the first turning section 210 is provided with a downwardly extending first oil return port 250, which is used to discharge the engine oil in the first labyrinth channel 190.

[0057] Understandably, a first oil return port 250 is set at the bottom of the first turning section 210 to promptly discharge the oil accumulated in the first labyrinth channel 190, so that the oil separated in the first labyrinth channel 190 can flow back to the crankcase for reuse, preventing the accumulated oil from being re-swept away by the airflow, and ensuring that the first labyrinth channel 190 can continuously and efficiently perform oil-gas separation.

[0058] In some specific embodiments, a second labyrinth channel 270 is formed between the right labyrinth cavity 130 and the housing gasket 160. The second labyrinth channel 270 is U-shaped and includes a second descending section 280, a second turning section 290 and a second ascending section 300 connected in sequence. The top end of the second descending section 280 is connected to a second vent 180, and an exhaust nozzle 150 is disposed at the top end of the second ascending section 300. The cross-sectional area of ​​the second descending section 280 gradually decreases along the direction close to the second turning section 290.

[0059] Understandably, by setting the second labyrinth channel 270 in a U-shape, the mixed oil and gas enters the second labyrinth channel 270 from the top of the second descending section 280, then flows downward along the second descending section 280, then flows through the second turning section 290 to the bottom of the second ascending section 300, and then flows upward along the second ascending section 300 from the bottom of the second ascending section 300. This forces a change in the direction of the mixed oil and gas, increases the probability of oil droplets colliding with the wall of the second labyrinth channel 270, promotes the separation of oil droplets and exhaust gas, and further improves the oil... On the other hand, the cross-sectional area of ​​the second descending section 280 gradually decreases along the direction close to the second turning section 290, thereby increasing the flow velocity of the mixed oil and gas. The oil droplets impact the wall due to inertia. By increasing the flow velocity of the mixed oil and gas, the inertial separation effect of the oil droplets can be enhanced. In particular, by continuously increasing the speed of the mixed oil and gas in the second descending section 280, the impact force of the mixed airflow on the side wall of the second turning section 290 can be further increased, so that the oil droplets of the mixed oil and gas can fully adhere to the side wall of the second turning section 290, further improving the oil and gas separation efficiency.

[0060] In some specific embodiments, the bottom end of the second descending section 280 extends downward at an angle and connects to one end of the second turning section 290, the other end of the second turning section 290 connects to the bottom end of the second rising section 300, and the top end of the second rising section 300 extends upward at an angle close to the second descending section 280. This allows the mixed oil and gas to continuously collide with the sidewall of the second labyrinth channel 270 during the flow of the second descending section 280 and the second rising section 300. By utilizing the adhesion effect between the wall and the mixed oil and gas, the flow of engine oil is blocked, thereby enhancing the oil-gas separation effect of the second labyrinth channel 270 on the mixed oil and gas.

[0061] In some specific embodiments, the second ascending section 300 is provided with a third oil-blocking rib 310. The third oil-blocking rib 310 is located on the side wall of the second ascending section 300 away from the second descending section 280. Thus, the third oil-blocking rib 310 can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow back along the wall surface, further improving the oil-gas separation effect. In some specific embodiments, the second descending section 280 is provided with a fourth oil-blocking rib 320. The fourth oil-blocking rib 320 is located on the side wall of the second descending section 280 near the second ascending section 300. Thus, by providing the fourth oil-blocking rib 320 in the second descending section 280 and its location near the side wall of the second ascending section 300, the fourth oil-blocking rib 320 can directly block oil droplets in the flowing mixed oil and gas, causing the oil droplets to adhere and flow along the wall to the bottom of the second turning section 290, further improving the oil-gas separation effect.

[0062] In some specific embodiments, the bottom of the second turning section 290 is provided with a downwardly extending second oil return port 330, which is used to drain the engine oil in the second labyrinth channel 270.

[0063] Understandably, a second oil return port 330 is set at the bottom of the second turning section 290 to promptly discharge the oil accumulated in the second labyrinth channel 270, so that the oil separated in the second labyrinth channel 270 can flow back to the crankcase for reuse, preventing the accumulated oil from being re-swept away by the airflow, and ensuring that the second labyrinth channel 270 can continuously and efficiently perform oil-gas separation.

[0064] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The terms "first," "second," "third," "fourth," etc. (if applicable) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.

[0066] It should also be noted that, in the description of this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0067] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may also include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatus.

[0068] Furthermore, 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 limitation, 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 said element.

[0069] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An engine crankcase, characterized in that, include: The left box (100) is provided with a left labyrinth cavity (110). The right housing (120) is provided with a right labyrinth cavity (130) and a labyrinth entrance (140). The top of the right labyrinth cavity (130) is provided with an exhaust nozzle (150) for discharging exhaust gas. A housing gasket (160) is disposed between the left housing (100) and the right housing (120) to isolate the left labyrinth cavity (110) and the right labyrinth cavity (130). It is provided with a first vent (170) and a second vent (180). The first vent (170) connects the labyrinth entrance (140) and the left labyrinth cavity (110), and the second vent (180) connects the left labyrinth cavity (110) and the right labyrinth cavity (130). A first maze passage (190) is formed between the left maze cavity (110) and the box gasket (160). The first maze passage (190) is U-shaped and includes a first descending section (200), a first turning section (210), and a first ascending section (220) connected in sequence. The top end of the first descending section (200) is connected to the first vent (170), and the top end of the first ascending section (220) is connected to the second vent (180). The cross-sectional area of ​​the first descending section (200) gradually decreases along the direction close to the first turning section (210).

2. The engine crankcase according to claim 1, characterized in that, The bottom end of the first descending segment (200) extends downward at an angle and connects to one end of the first turning segment (210). The other end of the first turning segment (210) connects to the bottom end of the first ascending segment (220). The top end of the first ascending segment (220) extends upward at an angle close to the first descending segment (200).

3. The engine crankcase according to claim 2, characterized in that, The first rising section (220) is provided with a first oil baffle (230), which is located on the side wall of the first rising section (220) away from the first falling section (200).

4. An engine crankcase according to claim 2, characterized in that, The first descending section (200) is provided with a second oil baffle (240), which is located on the side wall of the first descending section (200) near the first ascending section (220).

5. An engine crankcase according to claim 1, characterized in that, The bottom of the first turning section (210) is provided with a first oil return port (250) extending downward, which is used to drain the oil in the first labyrinth channel (190).

6. The engine crankcase according to claim 1, characterized in that, The right box (120) is provided with a first isolation rib (260), which is used to isolate the right maze cavity (130) and the maze entrance (140).

7. An engine crankcase according to claim 1, characterized in that, A second maze passage (270) is formed between the right maze cavity (130) and the housing gasket (160). The second maze passage (270) is U-shaped and includes a second descending section (280), a second turning section (290), and a second ascending section (300) connected in sequence. The top end of the second descending section (280) is connected to the second vent (180). The exhaust nozzle (150) is located at the top end of the second ascending section (300). The cross-sectional area of ​​the second descending section (280) gradually decreases in the direction close to the second turning section (290).

8. An engine crankcase according to claim 7, characterized in that, The bottom end of the second descending segment (280) extends downward at an angle and connects to one end of the second turning segment (290). The other end of the second turning segment (290) connects to the bottom end of the second ascending segment (300). The top end of the second ascending segment (300) extends upward at an angle in a direction close to the second descending segment (280).

9. An engine crankcase according to claim 8, characterized in that, The second rising section (300) is provided with a third oil baffle (310), which is located on the side wall of the second rising section (300) away from the second falling section (280); And / or, the second descending section (280) is provided with a fourth oil baffle (320), which is provided on the side wall of the second descending section (280) near the second ascending section (300).

10. An engine crankcase according to claim 7, characterized in that, The bottom of the second turning section (290) is provided with a downwardly extending second oil return port (330), which is used to drain the oil in the second labyrinth channel (270).

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